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Commit | Line | Data |
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ca557f44 AC |
1 | /* Target-struct-independent code to start (run) and stop an inferior |
2 | process. | |
8926118c | 3 | |
1d506c26 | 4 | Copyright (C) 1986-2024 Free Software Foundation, Inc. |
c906108c | 5 | |
c5aa993b | 6 | This file is part of GDB. |
c906108c | 7 | |
c5aa993b JM |
8 | This program is free software; you can redistribute it and/or modify |
9 | it under the terms of the GNU General Public License as published by | |
a9762ec7 | 10 | the Free Software Foundation; either version 3 of the License, or |
c5aa993b | 11 | (at your option) any later version. |
c906108c | 12 | |
c5aa993b JM |
13 | This program is distributed in the hope that it will be useful, |
14 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | GNU General Public License for more details. | |
c906108c | 17 | |
c5aa993b | 18 | You should have received a copy of the GNU General Public License |
a9762ec7 | 19 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
c906108c SS |
20 | |
21 | #include "defs.h" | |
bab37966 | 22 | #include "displaced-stepping.h" |
45741a9c | 23 | #include "infrun.h" |
c906108c SS |
24 | #include <ctype.h> |
25 | #include "symtab.h" | |
26 | #include "frame.h" | |
27 | #include "inferior.h" | |
28 | #include "breakpoint.h" | |
c906108c SS |
29 | #include "gdbcore.h" |
30 | #include "gdbcmd.h" | |
31 | #include "target.h" | |
2f4fcf00 | 32 | #include "target-connection.h" |
c906108c SS |
33 | #include "gdbthread.h" |
34 | #include "annotate.h" | |
1adeb98a | 35 | #include "symfile.h" |
7a292a7a | 36 | #include "top.h" |
13d03262 | 37 | #include "ui.h" |
2acceee2 | 38 | #include "inf-loop.h" |
4e052eda | 39 | #include "regcache.h" |
fd0407d6 | 40 | #include "value.h" |
76727919 | 41 | #include "observable.h" |
f636b87d | 42 | #include "language.h" |
a77053c2 | 43 | #include "solib.h" |
f17517ea | 44 | #include "main.h" |
186c406b | 45 | #include "block.h" |
034dad6f | 46 | #include "mi/mi-common.h" |
4f8d22e3 | 47 | #include "event-top.h" |
96429cc8 | 48 | #include "record.h" |
d02ed0bb | 49 | #include "record-full.h" |
edb3359d | 50 | #include "inline-frame.h" |
4efc6507 | 51 | #include "jit.h" |
06cd862c | 52 | #include "tracepoint.h" |
1bfeeb0f | 53 | #include "skip.h" |
28106bc2 SDJ |
54 | #include "probe.h" |
55 | #include "objfiles.h" | |
de0bea00 | 56 | #include "completer.h" |
9107fc8d | 57 | #include "target-descriptions.h" |
f15cb84a | 58 | #include "target-dcache.h" |
d83ad864 | 59 | #include "terminal.h" |
ff862be4 | 60 | #include "solist.h" |
400b5eca | 61 | #include "gdbsupport/event-loop.h" |
243a9253 | 62 | #include "thread-fsm.h" |
268a13a5 | 63 | #include "gdbsupport/enum-flags.h" |
5ed8105e | 64 | #include "progspace-and-thread.h" |
6b09f134 | 65 | #include <optional> |
46a62268 | 66 | #include "arch-utils.h" |
268a13a5 TT |
67 | #include "gdbsupport/scope-exit.h" |
68 | #include "gdbsupport/forward-scope-exit.h" | |
06cc9596 | 69 | #include "gdbsupport/gdb_select.h" |
5b6d1e4f | 70 | #include <unordered_map> |
93b54c8e | 71 | #include "async-event.h" |
b161a60d SM |
72 | #include "gdbsupport/selftest.h" |
73 | #include "scoped-mock-context.h" | |
74 | #include "test-target.h" | |
ba988419 | 75 | #include "gdbsupport/common-debug.h" |
7904e961 | 76 | #include "gdbsupport/buildargv.h" |
141cd158 | 77 | #include "extension.h" |
6d84a385 | 78 | #include "disasm.h" |
3f75a984 | 79 | #include "interps.h" |
c906108c SS |
80 | |
81 | /* Prototypes for local functions */ | |
82 | ||
2ea28649 | 83 | static void sig_print_info (enum gdb_signal); |
c906108c | 84 | |
96baa820 | 85 | static void sig_print_header (void); |
c906108c | 86 | |
d83ad864 DB |
87 | static void follow_inferior_reset_breakpoints (void); |
88 | ||
c4464ade | 89 | static bool currently_stepping (struct thread_info *tp); |
a289b8f6 | 90 | |
9efe17a3 | 91 | static void insert_hp_step_resume_breakpoint_at_frame (frame_info_ptr); |
2484c66b | 92 | |
9efe17a3 | 93 | static void insert_step_resume_breakpoint_at_caller (frame_info_ptr); |
2484c66b | 94 | |
2484c66b UW |
95 | static void insert_longjmp_resume_breakpoint (struct gdbarch *, CORE_ADDR); |
96 | ||
22b11ba9 | 97 | static bool maybe_software_singlestep (struct gdbarch *gdbarch); |
8550d3b3 | 98 | |
aff4e175 AB |
99 | static void resume (gdb_signal sig); |
100 | ||
5b6d1e4f PA |
101 | static void wait_for_inferior (inferior *inf); |
102 | ||
d8bbae6e SM |
103 | static void restart_threads (struct thread_info *event_thread, |
104 | inferior *inf = nullptr); | |
105 | ||
106 | static bool start_step_over (void); | |
107 | ||
2b718529 LS |
108 | static bool step_over_info_valid_p (void); |
109 | ||
7ac958f2 PA |
110 | static bool schedlock_applies (struct thread_info *tp); |
111 | ||
372316f1 PA |
112 | /* Asynchronous signal handler registered as event loop source for |
113 | when we have pending events ready to be passed to the core. */ | |
114 | static struct async_event_handler *infrun_async_inferior_event_token; | |
115 | ||
116 | /* Stores whether infrun_async was previously enabled or disabled. | |
117 | Starts off as -1, indicating "never enabled/disabled". */ | |
118 | static int infrun_is_async = -1; | |
fe6356de CL |
119 | static CORE_ADDR update_line_range_start (CORE_ADDR pc, |
120 | struct execution_control_state *ecs); | |
372316f1 PA |
121 | |
122 | /* See infrun.h. */ | |
123 | ||
124 | void | |
125 | infrun_async (int enable) | |
126 | { | |
127 | if (infrun_is_async != enable) | |
128 | { | |
129 | infrun_is_async = enable; | |
130 | ||
1eb8556f | 131 | infrun_debug_printf ("enable=%d", enable); |
372316f1 PA |
132 | |
133 | if (enable) | |
134 | mark_async_event_handler (infrun_async_inferior_event_token); | |
135 | else | |
136 | clear_async_event_handler (infrun_async_inferior_event_token); | |
137 | } | |
138 | } | |
139 | ||
0b333c5e PA |
140 | /* See infrun.h. */ |
141 | ||
142 | void | |
143 | mark_infrun_async_event_handler (void) | |
144 | { | |
145 | mark_async_event_handler (infrun_async_inferior_event_token); | |
146 | } | |
147 | ||
5fbbeb29 CF |
148 | /* When set, stop the 'step' command if we enter a function which has |
149 | no line number information. The normal behavior is that we step | |
150 | over such function. */ | |
491144b5 | 151 | bool step_stop_if_no_debug = false; |
920d2a44 AC |
152 | static void |
153 | show_step_stop_if_no_debug (struct ui_file *file, int from_tty, | |
154 | struct cmd_list_element *c, const char *value) | |
155 | { | |
6cb06a8c | 156 | gdb_printf (file, _("Mode of the step operation is %s.\n"), value); |
920d2a44 | 157 | } |
5fbbeb29 | 158 | |
b9f437de | 159 | /* proceed and normal_stop use this to notify the user when the |
6bf09ec0 PA |
160 | inferior stopped in a different thread than it had been running in. |
161 | It can also be used to find for which thread normal_stop last | |
162 | reported a stop. */ | |
a81871f7 | 163 | static thread_info_ref previous_thread; |
96baa820 | 164 | |
a81871f7 PA |
165 | /* See infrun.h. */ |
166 | ||
167 | void | |
168 | update_previous_thread () | |
169 | { | |
170 | if (inferior_ptid == null_ptid) | |
171 | previous_thread = nullptr; | |
172 | else | |
173 | previous_thread = thread_info_ref::new_reference (inferior_thread ()); | |
174 | } | |
7a292a7a | 175 | |
6bf09ec0 PA |
176 | /* See infrun.h. */ |
177 | ||
178 | thread_info * | |
179 | get_previous_thread () | |
180 | { | |
181 | return previous_thread.get (); | |
182 | } | |
183 | ||
07107ca6 LM |
184 | /* If set (default for legacy reasons), when following a fork, GDB |
185 | will detach from one of the fork branches, child or parent. | |
186 | Exactly which branch is detached depends on 'set follow-fork-mode' | |
187 | setting. */ | |
188 | ||
491144b5 | 189 | static bool detach_fork = true; |
6c95b8df | 190 | |
94ba44a6 | 191 | bool debug_infrun = false; |
920d2a44 AC |
192 | static void |
193 | show_debug_infrun (struct ui_file *file, int from_tty, | |
194 | struct cmd_list_element *c, const char *value) | |
195 | { | |
6cb06a8c | 196 | gdb_printf (file, _("Inferior debugging is %s.\n"), value); |
920d2a44 | 197 | } |
527159b7 | 198 | |
03583c20 UW |
199 | /* Support for disabling address space randomization. */ |
200 | ||
491144b5 | 201 | bool disable_randomization = true; |
03583c20 UW |
202 | |
203 | static void | |
204 | show_disable_randomization (struct ui_file *file, int from_tty, | |
205 | struct cmd_list_element *c, const char *value) | |
206 | { | |
207 | if (target_supports_disable_randomization ()) | |
6cb06a8c TT |
208 | gdb_printf (file, |
209 | _("Disabling randomization of debuggee's " | |
210 | "virtual address space is %s.\n"), | |
211 | value); | |
03583c20 | 212 | else |
0426ad51 TT |
213 | gdb_puts (_("Disabling randomization of debuggee's " |
214 | "virtual address space is unsupported on\n" | |
215 | "this platform.\n"), file); | |
03583c20 UW |
216 | } |
217 | ||
218 | static void | |
eb4c3f4a | 219 | set_disable_randomization (const char *args, int from_tty, |
03583c20 UW |
220 | struct cmd_list_element *c) |
221 | { | |
222 | if (!target_supports_disable_randomization ()) | |
223 | error (_("Disabling randomization of debuggee's " | |
224 | "virtual address space is unsupported on\n" | |
225 | "this platform.")); | |
226 | } | |
227 | ||
d32dc48e PA |
228 | /* User interface for non-stop mode. */ |
229 | ||
491144b5 CB |
230 | bool non_stop = false; |
231 | static bool non_stop_1 = false; | |
d32dc48e PA |
232 | |
233 | static void | |
eb4c3f4a | 234 | set_non_stop (const char *args, int from_tty, |
d32dc48e PA |
235 | struct cmd_list_element *c) |
236 | { | |
55f6301a | 237 | if (target_has_execution ()) |
d32dc48e PA |
238 | { |
239 | non_stop_1 = non_stop; | |
240 | error (_("Cannot change this setting while the inferior is running.")); | |
241 | } | |
242 | ||
243 | non_stop = non_stop_1; | |
244 | } | |
245 | ||
246 | static void | |
247 | show_non_stop (struct ui_file *file, int from_tty, | |
248 | struct cmd_list_element *c, const char *value) | |
249 | { | |
6cb06a8c TT |
250 | gdb_printf (file, |
251 | _("Controlling the inferior in non-stop mode is %s.\n"), | |
252 | value); | |
d32dc48e PA |
253 | } |
254 | ||
d914c394 SS |
255 | /* "Observer mode" is somewhat like a more extreme version of |
256 | non-stop, in which all GDB operations that might affect the | |
257 | target's execution have been disabled. */ | |
258 | ||
6bd434d6 | 259 | static bool observer_mode = false; |
491144b5 | 260 | static bool observer_mode_1 = false; |
d914c394 SS |
261 | |
262 | static void | |
eb4c3f4a | 263 | set_observer_mode (const char *args, int from_tty, |
d914c394 SS |
264 | struct cmd_list_element *c) |
265 | { | |
55f6301a | 266 | if (target_has_execution ()) |
d914c394 SS |
267 | { |
268 | observer_mode_1 = observer_mode; | |
269 | error (_("Cannot change this setting while the inferior is running.")); | |
270 | } | |
271 | ||
272 | observer_mode = observer_mode_1; | |
273 | ||
274 | may_write_registers = !observer_mode; | |
275 | may_write_memory = !observer_mode; | |
276 | may_insert_breakpoints = !observer_mode; | |
277 | may_insert_tracepoints = !observer_mode; | |
278 | /* We can insert fast tracepoints in or out of observer mode, | |
279 | but enable them if we're going into this mode. */ | |
280 | if (observer_mode) | |
491144b5 | 281 | may_insert_fast_tracepoints = true; |
d914c394 SS |
282 | may_stop = !observer_mode; |
283 | update_target_permissions (); | |
284 | ||
285 | /* Going *into* observer mode we must force non-stop, then | |
286 | going out we leave it that way. */ | |
287 | if (observer_mode) | |
288 | { | |
2f6831b8 | 289 | pagination_enabled = false; |
491144b5 | 290 | non_stop = non_stop_1 = true; |
d914c394 SS |
291 | } |
292 | ||
293 | if (from_tty) | |
6cb06a8c TT |
294 | gdb_printf (_("Observer mode is now %s.\n"), |
295 | (observer_mode ? "on" : "off")); | |
d914c394 SS |
296 | } |
297 | ||
298 | static void | |
299 | show_observer_mode (struct ui_file *file, int from_tty, | |
300 | struct cmd_list_element *c, const char *value) | |
301 | { | |
6cb06a8c | 302 | gdb_printf (file, _("Observer mode is %s.\n"), value); |
d914c394 SS |
303 | } |
304 | ||
305 | /* This updates the value of observer mode based on changes in | |
306 | permissions. Note that we are deliberately ignoring the values of | |
307 | may-write-registers and may-write-memory, since the user may have | |
308 | reason to enable these during a session, for instance to turn on a | |
309 | debugging-related global. */ | |
310 | ||
311 | void | |
312 | update_observer_mode (void) | |
313 | { | |
491144b5 CB |
314 | bool newval = (!may_insert_breakpoints |
315 | && !may_insert_tracepoints | |
316 | && may_insert_fast_tracepoints | |
317 | && !may_stop | |
318 | && non_stop); | |
d914c394 SS |
319 | |
320 | /* Let the user know if things change. */ | |
321 | if (newval != observer_mode) | |
6cb06a8c TT |
322 | gdb_printf (_("Observer mode is now %s.\n"), |
323 | (newval ? "on" : "off")); | |
d914c394 SS |
324 | |
325 | observer_mode = observer_mode_1 = newval; | |
326 | } | |
c2c6d25f | 327 | |
c906108c SS |
328 | /* Tables of how to react to signals; the user sets them. */ |
329 | ||
adc6a863 PA |
330 | static unsigned char signal_stop[GDB_SIGNAL_LAST]; |
331 | static unsigned char signal_print[GDB_SIGNAL_LAST]; | |
332 | static unsigned char signal_program[GDB_SIGNAL_LAST]; | |
c906108c | 333 | |
ab04a2af TT |
334 | /* Table of signals that are registered with "catch signal". A |
335 | non-zero entry indicates that the signal is caught by some "catch | |
adc6a863 PA |
336 | signal" command. */ |
337 | static unsigned char signal_catch[GDB_SIGNAL_LAST]; | |
ab04a2af | 338 | |
2455069d UW |
339 | /* Table of signals that the target may silently handle. |
340 | This is automatically determined from the flags above, | |
341 | and simply cached here. */ | |
adc6a863 | 342 | static unsigned char signal_pass[GDB_SIGNAL_LAST]; |
2455069d | 343 | |
c906108c SS |
344 | #define SET_SIGS(nsigs,sigs,flags) \ |
345 | do { \ | |
346 | int signum = (nsigs); \ | |
347 | while (signum-- > 0) \ | |
348 | if ((sigs)[signum]) \ | |
349 | (flags)[signum] = 1; \ | |
350 | } while (0) | |
351 | ||
352 | #define UNSET_SIGS(nsigs,sigs,flags) \ | |
353 | do { \ | |
354 | int signum = (nsigs); \ | |
355 | while (signum-- > 0) \ | |
356 | if ((sigs)[signum]) \ | |
357 | (flags)[signum] = 0; \ | |
358 | } while (0) | |
359 | ||
9b224c5e PA |
360 | /* Update the target's copy of SIGNAL_PROGRAM. The sole purpose of |
361 | this function is to avoid exporting `signal_program'. */ | |
362 | ||
363 | void | |
364 | update_signals_program_target (void) | |
365 | { | |
adc6a863 | 366 | target_program_signals (signal_program); |
9b224c5e PA |
367 | } |
368 | ||
1777feb0 | 369 | /* Value to pass to target_resume() to cause all threads to resume. */ |
39f77062 | 370 | |
edb3359d | 371 | #define RESUME_ALL minus_one_ptid |
c906108c SS |
372 | |
373 | /* Command list pointer for the "stop" placeholder. */ | |
374 | ||
375 | static struct cmd_list_element *stop_command; | |
376 | ||
c906108c SS |
377 | /* Nonzero if we want to give control to the user when we're notified |
378 | of shared library events by the dynamic linker. */ | |
628fe4e4 | 379 | int stop_on_solib_events; |
f9e14852 GB |
380 | |
381 | /* Enable or disable optional shared library event breakpoints | |
382 | as appropriate when the above flag is changed. */ | |
383 | ||
384 | static void | |
eb4c3f4a TT |
385 | set_stop_on_solib_events (const char *args, |
386 | int from_tty, struct cmd_list_element *c) | |
f9e14852 GB |
387 | { |
388 | update_solib_breakpoints (); | |
389 | } | |
390 | ||
920d2a44 AC |
391 | static void |
392 | show_stop_on_solib_events (struct ui_file *file, int from_tty, | |
393 | struct cmd_list_element *c, const char *value) | |
394 | { | |
6cb06a8c TT |
395 | gdb_printf (file, _("Stopping for shared library events is %s.\n"), |
396 | value); | |
920d2a44 | 397 | } |
c906108c | 398 | |
c4464ade | 399 | /* True after stop if current stack frame should be printed. */ |
c906108c | 400 | |
c4464ade | 401 | static bool stop_print_frame; |
c906108c | 402 | |
5b6d1e4f | 403 | /* This is a cached copy of the target/ptid/waitstatus of the last |
fb85cece | 404 | event returned by target_wait(). |
5b6d1e4f PA |
405 | This information is returned by get_last_target_status(). */ |
406 | static process_stratum_target *target_last_proc_target; | |
39f77062 | 407 | static ptid_t target_last_wait_ptid; |
e02bc4cc DS |
408 | static struct target_waitstatus target_last_waitstatus; |
409 | ||
4e1c45ea | 410 | void init_thread_stepping_state (struct thread_info *tss); |
0d1e5fa7 | 411 | |
53904c9e AC |
412 | static const char follow_fork_mode_child[] = "child"; |
413 | static const char follow_fork_mode_parent[] = "parent"; | |
414 | ||
40478521 | 415 | static const char *const follow_fork_mode_kind_names[] = { |
53904c9e AC |
416 | follow_fork_mode_child, |
417 | follow_fork_mode_parent, | |
03acd4d8 | 418 | nullptr |
ef346e04 | 419 | }; |
c906108c | 420 | |
53904c9e | 421 | static const char *follow_fork_mode_string = follow_fork_mode_parent; |
920d2a44 AC |
422 | static void |
423 | show_follow_fork_mode_string (struct ui_file *file, int from_tty, | |
424 | struct cmd_list_element *c, const char *value) | |
425 | { | |
6cb06a8c TT |
426 | gdb_printf (file, |
427 | _("Debugger response to a program " | |
428 | "call of fork or vfork is \"%s\".\n"), | |
429 | value); | |
920d2a44 | 430 | } |
c906108c SS |
431 | \f |
432 | ||
d83ad864 DB |
433 | /* Handle changes to the inferior list based on the type of fork, |
434 | which process is being followed, and whether the other process | |
435 | should be detached. On entry inferior_ptid must be the ptid of | |
436 | the fork parent. At return inferior_ptid is the ptid of the | |
437 | followed inferior. */ | |
438 | ||
5ab2fbf1 SM |
439 | static bool |
440 | follow_fork_inferior (bool follow_child, bool detach_fork) | |
d83ad864 | 441 | { |
b26b06dd AB |
442 | INFRUN_SCOPED_DEBUG_ENTER_EXIT; |
443 | ||
444 | infrun_debug_printf ("follow_child = %d, detach_fork = %d", | |
445 | follow_child, detach_fork); | |
446 | ||
183be222 | 447 | target_waitkind fork_kind = inferior_thread ()->pending_follow.kind (); |
3a849a34 SM |
448 | gdb_assert (fork_kind == TARGET_WAITKIND_FORKED |
449 | || fork_kind == TARGET_WAITKIND_VFORKED); | |
450 | bool has_vforked = fork_kind == TARGET_WAITKIND_VFORKED; | |
451 | ptid_t parent_ptid = inferior_ptid; | |
183be222 | 452 | ptid_t child_ptid = inferior_thread ()->pending_follow.child_ptid (); |
d83ad864 DB |
453 | |
454 | if (has_vforked | |
455 | && !non_stop /* Non-stop always resumes both branches. */ | |
3b12939d | 456 | && current_ui->prompt_state == PROMPT_BLOCKED |
d83ad864 DB |
457 | && !(follow_child || detach_fork || sched_multi)) |
458 | { | |
459 | /* The parent stays blocked inside the vfork syscall until the | |
460 | child execs or exits. If we don't let the child run, then | |
461 | the parent stays blocked. If we're telling the parent to run | |
462 | in the foreground, the user will not be able to ctrl-c to get | |
463 | back the terminal, effectively hanging the debug session. */ | |
6cb06a8c | 464 | gdb_printf (gdb_stderr, _("\ |
d83ad864 DB |
465 | Can not resume the parent process over vfork in the foreground while\n\ |
466 | holding the child stopped. Try \"set detach-on-fork\" or \ | |
467 | \"set schedule-multiple\".\n")); | |
e97007b6 | 468 | return true; |
d83ad864 DB |
469 | } |
470 | ||
82d1f134 SM |
471 | inferior *parent_inf = current_inferior (); |
472 | inferior *child_inf = nullptr; | |
ff770835 | 473 | |
d8bbae6e SM |
474 | gdb_assert (parent_inf->thread_waiting_for_vfork_done == nullptr); |
475 | ||
d83ad864 DB |
476 | if (!follow_child) |
477 | { | |
478 | /* Detach new forked process? */ | |
479 | if (detach_fork) | |
480 | { | |
d83ad864 DB |
481 | /* Before detaching from the child, remove all breakpoints |
482 | from it. If we forked, then this has already been taken | |
483 | care of by infrun.c. If we vforked however, any | |
484 | breakpoint inserted in the parent is visible in the | |
485 | child, even those added while stopped in a vfork | |
486 | catchpoint. This will remove the breakpoints from the | |
487 | parent also, but they'll be reinserted below. */ | |
488 | if (has_vforked) | |
489 | { | |
490 | /* Keep breakpoints list in sync. */ | |
00431a78 | 491 | remove_breakpoints_inf (current_inferior ()); |
d83ad864 DB |
492 | } |
493 | ||
f67c0c91 | 494 | if (print_inferior_events) |
d83ad864 | 495 | { |
8dd06f7a | 496 | /* Ensure that we have a process ptid. */ |
e99b03dc | 497 | ptid_t process_ptid = ptid_t (child_ptid.pid ()); |
8dd06f7a | 498 | |
223ffa71 | 499 | target_terminal::ours_for_output (); |
6cb06a8c TT |
500 | gdb_printf (_("[Detaching after %s from child %s]\n"), |
501 | has_vforked ? "vfork" : "fork", | |
502 | target_pid_to_str (process_ptid).c_str ()); | |
d83ad864 DB |
503 | } |
504 | } | |
505 | else | |
506 | { | |
d83ad864 | 507 | /* Add process to GDB's tables. */ |
e99b03dc | 508 | child_inf = add_inferior (child_ptid.pid ()); |
d83ad864 | 509 | |
d83ad864 DB |
510 | child_inf->attach_flag = parent_inf->attach_flag; |
511 | copy_terminal_info (child_inf, parent_inf); | |
27b1f19f | 512 | child_inf->set_arch (parent_inf->arch ()); |
57768366 | 513 | child_inf->tdesc_info = parent_inf->tdesc_info; |
d83ad864 | 514 | |
d83ad864 DB |
515 | child_inf->symfile_flags = SYMFILE_NO_READ; |
516 | ||
517 | /* If this is a vfork child, then the address-space is | |
518 | shared with the parent. */ | |
519 | if (has_vforked) | |
520 | { | |
521 | child_inf->pspace = parent_inf->pspace; | |
522 | child_inf->aspace = parent_inf->aspace; | |
523 | ||
82d1f134 | 524 | exec_on_vfork (child_inf); |
5b6d1e4f | 525 | |
d83ad864 DB |
526 | /* The parent will be frozen until the child is done |
527 | with the shared region. Keep track of the | |
528 | parent. */ | |
529 | child_inf->vfork_parent = parent_inf; | |
30220b46 | 530 | child_inf->pending_detach = false; |
d83ad864 | 531 | parent_inf->vfork_child = child_inf; |
30220b46 | 532 | parent_inf->pending_detach = false; |
d83ad864 DB |
533 | } |
534 | else | |
535 | { | |
f9582a22 TV |
536 | child_inf->pspace = new program_space (new_address_space ()); |
537 | child_inf->aspace = child_inf->pspace->aspace; | |
30220b46 | 538 | child_inf->removable = true; |
d83ad864 | 539 | clone_program_space (child_inf->pspace, parent_inf->pspace); |
d83ad864 | 540 | } |
d83ad864 DB |
541 | } |
542 | ||
543 | if (has_vforked) | |
544 | { | |
d83ad864 DB |
545 | /* If we detached from the child, then we have to be careful |
546 | to not insert breakpoints in the parent until the child | |
547 | is done with the shared memory region. However, if we're | |
548 | staying attached to the child, then we can and should | |
549 | insert breakpoints, so that we can debug it. A | |
550 | subsequent child exec or exit is enough to know when does | |
551 | the child stops using the parent's address space. */ | |
6f5d514f SM |
552 | parent_inf->thread_waiting_for_vfork_done |
553 | = detach_fork ? inferior_thread () : nullptr; | |
d83ad864 | 554 | parent_inf->pspace->breakpoints_not_allowed = detach_fork; |
b26b06dd AB |
555 | |
556 | infrun_debug_printf | |
557 | ("parent_inf->thread_waiting_for_vfork_done == %s", | |
558 | (parent_inf->thread_waiting_for_vfork_done == nullptr | |
559 | ? "nullptr" | |
560 | : (parent_inf->thread_waiting_for_vfork_done | |
561 | ->ptid.to_string ().c_str ()))); | |
d83ad864 DB |
562 | } |
563 | } | |
564 | else | |
565 | { | |
566 | /* Follow the child. */ | |
d83ad864 | 567 | |
f67c0c91 | 568 | if (print_inferior_events) |
d83ad864 | 569 | { |
f67c0c91 SDJ |
570 | std::string parent_pid = target_pid_to_str (parent_ptid); |
571 | std::string child_pid = target_pid_to_str (child_ptid); | |
572 | ||
223ffa71 | 573 | target_terminal::ours_for_output (); |
6cb06a8c TT |
574 | gdb_printf (_("[Attaching after %s %s to child %s]\n"), |
575 | parent_pid.c_str (), | |
576 | has_vforked ? "vfork" : "fork", | |
577 | child_pid.c_str ()); | |
d83ad864 DB |
578 | } |
579 | ||
580 | /* Add the new inferior first, so that the target_detach below | |
581 | doesn't unpush the target. */ | |
582 | ||
e99b03dc | 583 | child_inf = add_inferior (child_ptid.pid ()); |
d83ad864 | 584 | |
d83ad864 DB |
585 | child_inf->attach_flag = parent_inf->attach_flag; |
586 | copy_terminal_info (child_inf, parent_inf); | |
27b1f19f | 587 | child_inf->set_arch (parent_inf->arch ()); |
57768366 | 588 | child_inf->tdesc_info = parent_inf->tdesc_info; |
d83ad864 | 589 | |
da474da1 | 590 | if (has_vforked) |
d83ad864 | 591 | { |
da474da1 SM |
592 | /* If this is a vfork child, then the address-space is shared |
593 | with the parent. */ | |
594 | child_inf->aspace = parent_inf->aspace; | |
595 | child_inf->pspace = parent_inf->pspace; | |
5b6d1e4f | 596 | |
82d1f134 | 597 | exec_on_vfork (child_inf); |
d83ad864 | 598 | } |
da474da1 SM |
599 | else if (detach_fork) |
600 | { | |
601 | /* We follow the child and detach from the parent: move the parent's | |
602 | program space to the child. This simplifies some things, like | |
603 | doing "next" over fork() and landing on the expected line in the | |
604 | child (note, that is broken with "set detach-on-fork off"). | |
605 | ||
606 | Before assigning brand new spaces for the parent, remove | |
607 | breakpoints from it: because the new pspace won't match | |
608 | currently inserted locations, the normal detach procedure | |
609 | wouldn't remove them, and we would leave them inserted when | |
610 | detaching. */ | |
611 | remove_breakpoints_inf (parent_inf); | |
612 | ||
613 | child_inf->aspace = parent_inf->aspace; | |
614 | child_inf->pspace = parent_inf->pspace; | |
f9582a22 TV |
615 | parent_inf->pspace = new program_space (new_address_space ()); |
616 | parent_inf->aspace = parent_inf->pspace->aspace; | |
da474da1 SM |
617 | clone_program_space (parent_inf->pspace, child_inf->pspace); |
618 | ||
619 | /* The parent inferior is still the current one, so keep things | |
620 | in sync. */ | |
621 | set_current_program_space (parent_inf->pspace); | |
622 | } | |
d83ad864 DB |
623 | else |
624 | { | |
f9582a22 TV |
625 | child_inf->pspace = new program_space (new_address_space ()); |
626 | child_inf->aspace = child_inf->pspace->aspace; | |
30220b46 | 627 | child_inf->removable = true; |
d83ad864 | 628 | child_inf->symfile_flags = SYMFILE_NO_READ; |
da474da1 | 629 | clone_program_space (child_inf->pspace, parent_inf->pspace); |
d83ad864 DB |
630 | } |
631 | } | |
632 | ||
82d1f134 SM |
633 | gdb_assert (current_inferior () == parent_inf); |
634 | ||
635 | /* If we are setting up an inferior for the child, target_follow_fork is | |
636 | responsible for pushing the appropriate targets on the new inferior's | |
637 | target stack and adding the initial thread (with ptid CHILD_PTID). | |
638 | ||
639 | If we are not setting up an inferior for the child (because following | |
640 | the parent and detach_fork is true), it is responsible for detaching | |
641 | from CHILD_PTID. */ | |
642 | target_follow_fork (child_inf, child_ptid, fork_kind, follow_child, | |
643 | detach_fork); | |
644 | ||
f5694400 SM |
645 | gdb::observers::inferior_forked.notify (parent_inf, child_inf, fork_kind); |
646 | ||
82d1f134 SM |
647 | /* target_follow_fork must leave the parent as the current inferior. If we |
648 | want to follow the child, we make it the current one below. */ | |
649 | gdb_assert (current_inferior () == parent_inf); | |
650 | ||
651 | /* If there is a child inferior, target_follow_fork must have created a thread | |
652 | for it. */ | |
653 | if (child_inf != nullptr) | |
654 | gdb_assert (!child_inf->thread_list.empty ()); | |
655 | ||
577d2167 SM |
656 | /* Clear the parent thread's pending follow field. Do this before calling |
657 | target_detach, so that the target can differentiate the two following | |
658 | cases: | |
659 | ||
660 | - We continue past a fork with "follow-fork-mode == child" && | |
661 | "detach-on-fork on", and therefore detach the parent. In that | |
662 | case the target should not detach the fork child. | |
663 | - We run to a fork catchpoint and the user types "detach". In that | |
664 | case, the target should detach the fork child in addition to the | |
665 | parent. | |
666 | ||
667 | The former case will have pending_follow cleared, the later will have | |
668 | pending_follow set. */ | |
3c8af02f | 669 | thread_info *parent_thread = parent_inf->find_thread (parent_ptid); |
577d2167 SM |
670 | gdb_assert (parent_thread != nullptr); |
671 | parent_thread->pending_follow.set_spurious (); | |
672 | ||
82d1f134 SM |
673 | /* Detach the parent if needed. */ |
674 | if (follow_child) | |
675 | { | |
676 | /* If we're vforking, we want to hold on to the parent until | |
677 | the child exits or execs. At child exec or exit time we | |
678 | can remove the old breakpoints from the parent and detach | |
679 | or resume debugging it. Otherwise, detach the parent now; | |
680 | we'll want to reuse it's program/address spaces, but we | |
681 | can't set them to the child before removing breakpoints | |
682 | from the parent, otherwise, the breakpoints module could | |
683 | decide to remove breakpoints from the wrong process (since | |
684 | they'd be assigned to the same address space). */ | |
685 | ||
686 | if (has_vforked) | |
687 | { | |
03acd4d8 CL |
688 | gdb_assert (child_inf->vfork_parent == nullptr); |
689 | gdb_assert (parent_inf->vfork_child == nullptr); | |
82d1f134 | 690 | child_inf->vfork_parent = parent_inf; |
30220b46 | 691 | child_inf->pending_detach = false; |
82d1f134 SM |
692 | parent_inf->vfork_child = child_inf; |
693 | parent_inf->pending_detach = detach_fork; | |
82d1f134 SM |
694 | } |
695 | else if (detach_fork) | |
696 | { | |
697 | if (print_inferior_events) | |
698 | { | |
699 | /* Ensure that we have a process ptid. */ | |
700 | ptid_t process_ptid = ptid_t (parent_ptid.pid ()); | |
701 | ||
702 | target_terminal::ours_for_output (); | |
6cb06a8c TT |
703 | gdb_printf (_("[Detaching after fork from " |
704 | "parent %s]\n"), | |
705 | target_pid_to_str (process_ptid).c_str ()); | |
82d1f134 SM |
706 | } |
707 | ||
708 | target_detach (parent_inf, 0); | |
709 | } | |
710 | } | |
e97007b6 | 711 | |
ff770835 SM |
712 | /* If we ended up creating a new inferior, call post_create_inferior to inform |
713 | the various subcomponents. */ | |
82d1f134 | 714 | if (child_inf != nullptr) |
ff770835 | 715 | { |
82d1f134 | 716 | /* If FOLLOW_CHILD, we leave CHILD_INF as the current inferior |
287de656 | 717 | (do not restore the parent as the current inferior). */ |
6b09f134 | 718 | std::optional<scoped_restore_current_thread> maybe_restore; |
82d1f134 | 719 | |
05e1cac2 | 720 | if (!follow_child && !sched_multi) |
82d1f134 | 721 | maybe_restore.emplace (); |
ff770835 | 722 | |
82d1f134 | 723 | switch_to_thread (*child_inf->threads ().begin ()); |
ff770835 SM |
724 | post_create_inferior (0); |
725 | } | |
726 | ||
e97007b6 | 727 | return false; |
d83ad864 DB |
728 | } |
729 | ||
3505d4c4 PA |
730 | /* Set the last target status as TP having stopped. */ |
731 | ||
732 | static void | |
733 | set_last_target_status_stopped (thread_info *tp) | |
734 | { | |
735 | set_last_target_status (tp->inf->process_target (), tp->ptid, | |
736 | target_waitstatus {}.set_stopped (GDB_SIGNAL_0)); | |
737 | } | |
738 | ||
e58b0e63 PA |
739 | /* Tell the target to follow the fork we're stopped at. Returns true |
740 | if the inferior should be resumed; false, if the target for some | |
741 | reason decided it's best not to resume. */ | |
742 | ||
5ab2fbf1 SM |
743 | static bool |
744 | follow_fork () | |
c906108c | 745 | { |
b26b06dd AB |
746 | INFRUN_SCOPED_DEBUG_ENTER_EXIT; |
747 | ||
5ab2fbf1 SM |
748 | bool follow_child = (follow_fork_mode_string == follow_fork_mode_child); |
749 | bool should_resume = true; | |
e58b0e63 PA |
750 | |
751 | /* Copy user stepping state to the new inferior thread. FIXME: the | |
752 | followed fork child thread should have a copy of most of the | |
4e3990f4 DE |
753 | parent thread structure's run control related fields, not just these. |
754 | Initialized to avoid "may be used uninitialized" warnings from gcc. */ | |
03acd4d8 CL |
755 | struct breakpoint *step_resume_breakpoint = nullptr; |
756 | struct breakpoint *exception_resume_breakpoint = nullptr; | |
4e3990f4 DE |
757 | CORE_ADDR step_range_start = 0; |
758 | CORE_ADDR step_range_end = 0; | |
bf4cb9be | 759 | int current_line = 0; |
03acd4d8 | 760 | symtab *current_symtab = nullptr; |
4e3990f4 | 761 | struct frame_id step_frame_id = { 0 }; |
e58b0e63 PA |
762 | |
763 | if (!non_stop) | |
764 | { | |
3505d4c4 PA |
765 | thread_info *cur_thr = inferior_thread (); |
766 | ||
767 | ptid_t resume_ptid | |
768 | = user_visible_resume_ptid (cur_thr->control.stepping_command); | |
769 | process_stratum_target *resume_target | |
770 | = user_visible_resume_target (resume_ptid); | |
771 | ||
772 | /* Check if there's a thread that we're about to resume, other | |
773 | than the current, with an unfollowed fork/vfork. If so, | |
774 | switch back to it, to tell the target to follow it (in either | |
775 | direction). We'll afterwards refuse to resume, and inform | |
776 | the user what happened. */ | |
777 | for (thread_info *tp : all_non_exited_threads (resume_target, | |
778 | resume_ptid)) | |
e58b0e63 | 779 | { |
3505d4c4 PA |
780 | if (tp == cur_thr) |
781 | continue; | |
782 | ||
bd9482bc PA |
783 | /* follow_fork_inferior clears tp->pending_follow, and below |
784 | we'll need the value after the follow_fork_inferior | |
785 | call. */ | |
786 | target_waitkind kind = tp->pending_follow.kind (); | |
787 | ||
788 | if (kind != TARGET_WAITKIND_SPURIOUS) | |
3505d4c4 PA |
789 | { |
790 | infrun_debug_printf ("need to follow-fork [%s] first", | |
791 | tp->ptid.to_string ().c_str ()); | |
792 | ||
793 | switch_to_thread (tp); | |
bd9482bc PA |
794 | |
795 | /* Set up inferior(s) as specified by the caller, and | |
796 | tell the target to do whatever is necessary to follow | |
797 | either parent or child. */ | |
798 | if (follow_child) | |
799 | { | |
800 | /* The thread that started the execution command | |
801 | won't exist in the child. Abort the command and | |
802 | immediately stop in this thread, in the child, | |
803 | inside fork. */ | |
804 | should_resume = false; | |
805 | } | |
806 | else | |
807 | { | |
808 | /* Following the parent, so let the thread fork its | |
809 | child freely, it won't influence the current | |
810 | execution command. */ | |
811 | if (follow_fork_inferior (follow_child, detach_fork)) | |
812 | { | |
813 | /* Target refused to follow, or there's some | |
814 | other reason we shouldn't resume. */ | |
815 | switch_to_thread (cur_thr); | |
816 | set_last_target_status_stopped (cur_thr); | |
817 | return false; | |
818 | } | |
819 | ||
820 | /* If we're following a vfork, when we need to leave | |
821 | the just-forked thread as selected, as we need to | |
822 | solo-resume it to collect the VFORK_DONE event. | |
823 | If we're following a fork, however, switch back | |
824 | to the original thread that we continue stepping | |
825 | it, etc. */ | |
826 | if (kind != TARGET_WAITKIND_VFORKED) | |
827 | { | |
828 | gdb_assert (kind == TARGET_WAITKIND_FORKED); | |
829 | switch_to_thread (cur_thr); | |
830 | } | |
831 | } | |
832 | ||
3505d4c4 PA |
833 | break; |
834 | } | |
e58b0e63 PA |
835 | } |
836 | } | |
837 | ||
577d2167 | 838 | thread_info *tp = inferior_thread (); |
e58b0e63 PA |
839 | |
840 | /* If there were any forks/vforks that were caught and are now to be | |
841 | followed, then do so now. */ | |
183be222 | 842 | switch (tp->pending_follow.kind ()) |
e58b0e63 PA |
843 | { |
844 | case TARGET_WAITKIND_FORKED: | |
845 | case TARGET_WAITKIND_VFORKED: | |
846 | { | |
847 | ptid_t parent, child; | |
573269a8 | 848 | std::unique_ptr<struct thread_fsm> thread_fsm; |
e58b0e63 PA |
849 | |
850 | /* If the user did a next/step, etc, over a fork call, | |
851 | preserve the stepping state in the fork child. */ | |
852 | if (follow_child && should_resume) | |
853 | { | |
8358c15c JK |
854 | step_resume_breakpoint = clone_momentary_breakpoint |
855 | (tp->control.step_resume_breakpoint); | |
16c381f0 JK |
856 | step_range_start = tp->control.step_range_start; |
857 | step_range_end = tp->control.step_range_end; | |
bf4cb9be TV |
858 | current_line = tp->current_line; |
859 | current_symtab = tp->current_symtab; | |
16c381f0 | 860 | step_frame_id = tp->control.step_frame_id; |
186c406b TT |
861 | exception_resume_breakpoint |
862 | = clone_momentary_breakpoint (tp->control.exception_resume_breakpoint); | |
573269a8 | 863 | thread_fsm = tp->release_thread_fsm (); |
e58b0e63 PA |
864 | |
865 | /* For now, delete the parent's sr breakpoint, otherwise, | |
866 | parent/child sr breakpoints are considered duplicates, | |
867 | and the child version will not be installed. Remove | |
868 | this when the breakpoints module becomes aware of | |
869 | inferiors and address spaces. */ | |
870 | delete_step_resume_breakpoint (tp); | |
16c381f0 JK |
871 | tp->control.step_range_start = 0; |
872 | tp->control.step_range_end = 0; | |
873 | tp->control.step_frame_id = null_frame_id; | |
186c406b | 874 | delete_exception_resume_breakpoint (tp); |
e58b0e63 PA |
875 | } |
876 | ||
877 | parent = inferior_ptid; | |
183be222 | 878 | child = tp->pending_follow.child_ptid (); |
e58b0e63 | 879 | |
d8bbae6e SM |
880 | /* If handling a vfork, stop all the inferior's threads, they will be |
881 | restarted when the vfork shared region is complete. */ | |
882 | if (tp->pending_follow.kind () == TARGET_WAITKIND_VFORKED | |
883 | && target_is_non_stop_p ()) | |
884 | stop_all_threads ("handling vfork", tp->inf); | |
885 | ||
5b6d1e4f | 886 | process_stratum_target *parent_targ = tp->inf->process_target (); |
d83ad864 DB |
887 | /* Set up inferior(s) as specified by the caller, and tell the |
888 | target to do whatever is necessary to follow either parent | |
889 | or child. */ | |
890 | if (follow_fork_inferior (follow_child, detach_fork)) | |
e58b0e63 PA |
891 | { |
892 | /* Target refused to follow, or there's some other reason | |
893 | we shouldn't resume. */ | |
894 | should_resume = 0; | |
895 | } | |
896 | else | |
897 | { | |
1777feb0 | 898 | /* If we followed the child, switch to it... */ |
e58b0e63 PA |
899 | if (follow_child) |
900 | { | |
9213a6d7 | 901 | tp = parent_targ->find_thread (child); |
3505d4c4 | 902 | switch_to_thread (tp); |
e58b0e63 PA |
903 | |
904 | /* ... and preserve the stepping state, in case the | |
905 | user was stepping over the fork call. */ | |
906 | if (should_resume) | |
907 | { | |
8358c15c JK |
908 | tp->control.step_resume_breakpoint |
909 | = step_resume_breakpoint; | |
16c381f0 JK |
910 | tp->control.step_range_start = step_range_start; |
911 | tp->control.step_range_end = step_range_end; | |
bf4cb9be TV |
912 | tp->current_line = current_line; |
913 | tp->current_symtab = current_symtab; | |
16c381f0 | 914 | tp->control.step_frame_id = step_frame_id; |
186c406b TT |
915 | tp->control.exception_resume_breakpoint |
916 | = exception_resume_breakpoint; | |
573269a8 | 917 | tp->set_thread_fsm (std::move (thread_fsm)); |
e58b0e63 PA |
918 | } |
919 | else | |
920 | { | |
921 | /* If we get here, it was because we're trying to | |
922 | resume from a fork catchpoint, but, the user | |
923 | has switched threads away from the thread that | |
924 | forked. In that case, the resume command | |
925 | issued is most likely not applicable to the | |
926 | child, so just warn, and refuse to resume. */ | |
3e43a32a | 927 | warning (_("Not resuming: switched threads " |
fd7dcb94 | 928 | "before following fork child.")); |
e58b0e63 PA |
929 | } |
930 | ||
931 | /* Reset breakpoints in the child as appropriate. */ | |
932 | follow_inferior_reset_breakpoints (); | |
933 | } | |
e58b0e63 PA |
934 | } |
935 | } | |
936 | break; | |
937 | case TARGET_WAITKIND_SPURIOUS: | |
938 | /* Nothing to follow. */ | |
939 | break; | |
940 | default: | |
f34652de | 941 | internal_error ("Unexpected pending_follow.kind %d\n", |
183be222 | 942 | tp->pending_follow.kind ()); |
e58b0e63 PA |
943 | break; |
944 | } | |
c906108c | 945 | |
3505d4c4 PA |
946 | if (!should_resume) |
947 | set_last_target_status_stopped (tp); | |
e58b0e63 | 948 | return should_resume; |
c906108c SS |
949 | } |
950 | ||
d83ad864 | 951 | static void |
6604731b | 952 | follow_inferior_reset_breakpoints (void) |
c906108c | 953 | { |
4e1c45ea PA |
954 | struct thread_info *tp = inferior_thread (); |
955 | ||
6604731b DJ |
956 | /* Was there a step_resume breakpoint? (There was if the user |
957 | did a "next" at the fork() call.) If so, explicitly reset its | |
a1aa2221 LM |
958 | thread number. Cloned step_resume breakpoints are disabled on |
959 | creation, so enable it here now that it is associated with the | |
960 | correct thread. | |
6604731b DJ |
961 | |
962 | step_resumes are a form of bp that are made to be per-thread. | |
963 | Since we created the step_resume bp when the parent process | |
964 | was being debugged, and now are switching to the child process, | |
965 | from the breakpoint package's viewpoint, that's a switch of | |
966 | "threads". We must update the bp's notion of which thread | |
967 | it is for, or it'll be ignored when it triggers. */ | |
968 | ||
8358c15c | 969 | if (tp->control.step_resume_breakpoint) |
a1aa2221 LM |
970 | { |
971 | breakpoint_re_set_thread (tp->control.step_resume_breakpoint); | |
f5951b9f | 972 | tp->control.step_resume_breakpoint->first_loc ().enabled = 1; |
a1aa2221 | 973 | } |
6604731b | 974 | |
a1aa2221 | 975 | /* Treat exception_resume breakpoints like step_resume breakpoints. */ |
186c406b | 976 | if (tp->control.exception_resume_breakpoint) |
a1aa2221 LM |
977 | { |
978 | breakpoint_re_set_thread (tp->control.exception_resume_breakpoint); | |
f5951b9f | 979 | tp->control.exception_resume_breakpoint->first_loc ().enabled = 1; |
a1aa2221 | 980 | } |
186c406b | 981 | |
6604731b DJ |
982 | /* Reinsert all breakpoints in the child. The user may have set |
983 | breakpoints after catching the fork, in which case those | |
984 | were never set in the child, but only in the parent. This makes | |
985 | sure the inserted breakpoints match the breakpoint list. */ | |
986 | ||
987 | breakpoint_re_set (); | |
988 | insert_breakpoints (); | |
c906108c | 989 | } |
c906108c | 990 | |
69eadcc9 SM |
991 | /* The child has exited or execed: resume THREAD, a thread of the parent, |
992 | if it was meant to be executing. */ | |
6c95b8df | 993 | |
69eadcc9 SM |
994 | static void |
995 | proceed_after_vfork_done (thread_info *thread) | |
6c95b8df | 996 | { |
69eadcc9 | 997 | if (thread->state == THREAD_RUNNING |
611841bb | 998 | && !thread->executing () |
6c95b8df | 999 | && !thread->stop_requested |
1edb66d8 | 1000 | && thread->stop_signal () == GDB_SIGNAL_0) |
6c95b8df | 1001 | { |
1eb8556f | 1002 | infrun_debug_printf ("resuming vfork parent thread %s", |
0fab7955 | 1003 | thread->ptid.to_string ().c_str ()); |
6c95b8df | 1004 | |
00431a78 | 1005 | switch_to_thread (thread); |
70509625 | 1006 | clear_proceed_status (0); |
64ce06e4 | 1007 | proceed ((CORE_ADDR) -1, GDB_SIGNAL_DEFAULT); |
6c95b8df | 1008 | } |
6c95b8df PA |
1009 | } |
1010 | ||
1011 | /* Called whenever we notice an exec or exit event, to handle | |
1012 | detaching or resuming a vfork parent. */ | |
1013 | ||
1014 | static void | |
1015 | handle_vfork_child_exec_or_exit (int exec) | |
1016 | { | |
b26b06dd AB |
1017 | INFRUN_SCOPED_DEBUG_ENTER_EXIT; |
1018 | ||
6c95b8df PA |
1019 | struct inferior *inf = current_inferior (); |
1020 | ||
1021 | if (inf->vfork_parent) | |
1022 | { | |
69eadcc9 | 1023 | inferior *resume_parent = nullptr; |
6c95b8df PA |
1024 | |
1025 | /* This exec or exit marks the end of the shared memory region | |
b73715df TV |
1026 | between the parent and the child. Break the bonds. */ |
1027 | inferior *vfork_parent = inf->vfork_parent; | |
03acd4d8 CL |
1028 | inf->vfork_parent->vfork_child = nullptr; |
1029 | inf->vfork_parent = nullptr; | |
6c95b8df | 1030 | |
b73715df TV |
1031 | /* If the user wanted to detach from the parent, now is the |
1032 | time. */ | |
1033 | if (vfork_parent->pending_detach) | |
6c95b8df | 1034 | { |
6c95b8df | 1035 | struct program_space *pspace; |
6c95b8df | 1036 | |
1777feb0 | 1037 | /* follow-fork child, detach-on-fork on. */ |
6c95b8df | 1038 | |
30220b46 | 1039 | vfork_parent->pending_detach = false; |
68c9da30 | 1040 | |
18493a00 | 1041 | scoped_restore_current_pspace_and_thread restore_thread; |
6c95b8df PA |
1042 | |
1043 | /* We're letting loose of the parent. */ | |
18493a00 | 1044 | thread_info *tp = any_live_thread_of_inferior (vfork_parent); |
00431a78 | 1045 | switch_to_thread (tp); |
6c95b8df PA |
1046 | |
1047 | /* We're about to detach from the parent, which implicitly | |
1048 | removes breakpoints from its address space. There's a | |
1049 | catch here: we want to reuse the spaces for the child, | |
1050 | but, parent/child are still sharing the pspace at this | |
1051 | point, although the exec in reality makes the kernel give | |
1052 | the child a fresh set of new pages. The problem here is | |
1053 | that the breakpoints module being unaware of this, would | |
1054 | likely chose the child process to write to the parent | |
1055 | address space. Swapping the child temporarily away from | |
1056 | the spaces has the desired effect. Yes, this is "sort | |
1057 | of" a hack. */ | |
1058 | ||
1059 | pspace = inf->pspace; | |
03acd4d8 | 1060 | inf->pspace = nullptr; |
f9582a22 | 1061 | address_space_ref_ptr aspace = std::move (inf->aspace); |
6c95b8df | 1062 | |
f67c0c91 | 1063 | if (print_inferior_events) |
6c95b8df | 1064 | { |
a068643d | 1065 | std::string pidstr |
b73715df | 1066 | = target_pid_to_str (ptid_t (vfork_parent->pid)); |
f67c0c91 | 1067 | |
223ffa71 | 1068 | target_terminal::ours_for_output (); |
6c95b8df PA |
1069 | |
1070 | if (exec) | |
6f259a23 | 1071 | { |
6cb06a8c TT |
1072 | gdb_printf (_("[Detaching vfork parent %s " |
1073 | "after child exec]\n"), pidstr.c_str ()); | |
6f259a23 | 1074 | } |
6c95b8df | 1075 | else |
6f259a23 | 1076 | { |
6cb06a8c TT |
1077 | gdb_printf (_("[Detaching vfork parent %s " |
1078 | "after child exit]\n"), pidstr.c_str ()); | |
6f259a23 | 1079 | } |
6c95b8df PA |
1080 | } |
1081 | ||
b73715df | 1082 | target_detach (vfork_parent, 0); |
6c95b8df PA |
1083 | |
1084 | /* Put it back. */ | |
1085 | inf->pspace = pspace; | |
1086 | inf->aspace = aspace; | |
6c95b8df PA |
1087 | } |
1088 | else if (exec) | |
1089 | { | |
1090 | /* We're staying attached to the parent, so, really give the | |
1091 | child a new address space. */ | |
564b1e3f | 1092 | inf->pspace = new program_space (maybe_new_address_space ()); |
6c95b8df | 1093 | inf->aspace = inf->pspace->aspace; |
30220b46 | 1094 | inf->removable = true; |
6c95b8df PA |
1095 | set_current_program_space (inf->pspace); |
1096 | ||
69eadcc9 | 1097 | resume_parent = vfork_parent; |
6c95b8df PA |
1098 | } |
1099 | else | |
1100 | { | |
6c95b8df PA |
1101 | /* If this is a vfork child exiting, then the pspace and |
1102 | aspaces were shared with the parent. Since we're | |
1103 | reporting the process exit, we'll be mourning all that is | |
1104 | found in the address space, and switching to null_ptid, | |
1105 | preparing to start a new inferior. But, since we don't | |
1106 | want to clobber the parent's address/program spaces, we | |
1107 | go ahead and create a new one for this exiting | |
1108 | inferior. */ | |
1109 | ||
18493a00 | 1110 | scoped_restore_current_thread restore_thread; |
6c95b8df | 1111 | |
14414227 TV |
1112 | /* Temporarily switch to the vfork parent, to facilitate ptrace |
1113 | calls done during maybe_new_address_space. */ | |
1114 | switch_to_thread (any_live_thread_of_inferior (vfork_parent)); | |
1115 | address_space_ref_ptr aspace = maybe_new_address_space (); | |
1116 | ||
1117 | /* Switch back to the vfork child inferior. Switch to no-thread | |
1118 | while running clone_program_space, so that clone_program_space | |
1119 | doesn't want to read the selected frame of a dead process. */ | |
1120 | switch_to_inferior_no_thread (inf); | |
1121 | ||
1122 | inf->pspace = new program_space (std::move (aspace)); | |
53af73bf PA |
1123 | inf->aspace = inf->pspace->aspace; |
1124 | set_current_program_space (inf->pspace); | |
30220b46 | 1125 | inf->removable = true; |
7dcd53a0 | 1126 | inf->symfile_flags = SYMFILE_NO_READ; |
53af73bf | 1127 | clone_program_space (inf->pspace, vfork_parent->pspace); |
6c95b8df | 1128 | |
69eadcc9 | 1129 | resume_parent = vfork_parent; |
6c95b8df PA |
1130 | } |
1131 | ||
6c95b8df PA |
1132 | gdb_assert (current_program_space == inf->pspace); |
1133 | ||
69eadcc9 | 1134 | if (non_stop && resume_parent != nullptr) |
6c95b8df PA |
1135 | { |
1136 | /* If the user wanted the parent to be running, let it go | |
1137 | free now. */ | |
5ed8105e | 1138 | scoped_restore_current_thread restore_thread; |
6c95b8df | 1139 | |
1eb8556f | 1140 | infrun_debug_printf ("resuming vfork parent process %d", |
69eadcc9 | 1141 | resume_parent->pid); |
6c95b8df | 1142 | |
69eadcc9 SM |
1143 | for (thread_info *thread : resume_parent->threads ()) |
1144 | proceed_after_vfork_done (thread); | |
6c95b8df PA |
1145 | } |
1146 | } | |
1147 | } | |
1148 | ||
d8bbae6e SM |
1149 | /* Handle TARGET_WAITKIND_VFORK_DONE. */ |
1150 | ||
1151 | static void | |
1152 | handle_vfork_done (thread_info *event_thread) | |
1153 | { | |
b26b06dd AB |
1154 | INFRUN_SCOPED_DEBUG_ENTER_EXIT; |
1155 | ||
d8bbae6e SM |
1156 | /* We only care about this event if inferior::thread_waiting_for_vfork_done is |
1157 | set, that is if we are waiting for a vfork child not under our control | |
1158 | (because we detached it) to exec or exit. | |
1159 | ||
1160 | If an inferior has vforked and we are debugging the child, we don't use | |
1161 | the vfork-done event to get notified about the end of the shared address | |
1162 | space window. We rely instead on the child's exec or exit event, and the | |
1163 | inferior::vfork_{parent,child} fields are used instead. See | |
1164 | handle_vfork_child_exec_or_exit for that. */ | |
1165 | if (event_thread->inf->thread_waiting_for_vfork_done == nullptr) | |
1166 | { | |
1167 | infrun_debug_printf ("not waiting for a vfork-done event"); | |
1168 | return; | |
1169 | } | |
1170 | ||
d8bbae6e SM |
1171 | /* We stopped all threads (other than the vforking thread) of the inferior in |
1172 | follow_fork and kept them stopped until now. It should therefore not be | |
1173 | possible for another thread to have reported a vfork during that window. | |
1174 | If THREAD_WAITING_FOR_VFORK_DONE is set, it has to be the same thread whose | |
1175 | vfork-done we are handling right now. */ | |
1176 | gdb_assert (event_thread->inf->thread_waiting_for_vfork_done == event_thread); | |
1177 | ||
1178 | event_thread->inf->thread_waiting_for_vfork_done = nullptr; | |
1179 | event_thread->inf->pspace->breakpoints_not_allowed = 0; | |
1180 | ||
1181 | /* On non-stop targets, we stopped all the inferior's threads in follow_fork, | |
1182 | resume them now. On all-stop targets, everything that needs to be resumed | |
1183 | will be when we resume the event thread. */ | |
1184 | if (target_is_non_stop_p ()) | |
1185 | { | |
1186 | /* restart_threads and start_step_over may change the current thread, make | |
1187 | sure we leave the event thread as the current thread. */ | |
1188 | scoped_restore_current_thread restore_thread; | |
1189 | ||
1190 | insert_breakpoints (); | |
d8bbae6e | 1191 | start_step_over (); |
2b718529 LS |
1192 | |
1193 | if (!step_over_info_valid_p ()) | |
1194 | restart_threads (event_thread, event_thread->inf); | |
d8bbae6e SM |
1195 | } |
1196 | } | |
1197 | ||
eb6c553b | 1198 | /* Enum strings for "set|show follow-exec-mode". */ |
6c95b8df PA |
1199 | |
1200 | static const char follow_exec_mode_new[] = "new"; | |
1201 | static const char follow_exec_mode_same[] = "same"; | |
40478521 | 1202 | static const char *const follow_exec_mode_names[] = |
6c95b8df PA |
1203 | { |
1204 | follow_exec_mode_new, | |
1205 | follow_exec_mode_same, | |
03acd4d8 | 1206 | nullptr, |
6c95b8df PA |
1207 | }; |
1208 | ||
1209 | static const char *follow_exec_mode_string = follow_exec_mode_same; | |
1210 | static void | |
1211 | show_follow_exec_mode_string (struct ui_file *file, int from_tty, | |
1212 | struct cmd_list_element *c, const char *value) | |
1213 | { | |
6cb06a8c | 1214 | gdb_printf (file, _("Follow exec mode is \"%s\".\n"), value); |
6c95b8df PA |
1215 | } |
1216 | ||
ecf45d2c | 1217 | /* EXEC_FILE_TARGET is assumed to be non-NULL. */ |
1adeb98a | 1218 | |
c906108c | 1219 | static void |
4ca51187 | 1220 | follow_exec (ptid_t ptid, const char *exec_file_target) |
c906108c | 1221 | { |
e99b03dc | 1222 | int pid = ptid.pid (); |
94585166 | 1223 | ptid_t process_ptid; |
7a292a7a | 1224 | |
65d2b333 PW |
1225 | /* Switch terminal for any messages produced e.g. by |
1226 | breakpoint_re_set. */ | |
1227 | target_terminal::ours_for_output (); | |
1228 | ||
c906108c SS |
1229 | /* This is an exec event that we actually wish to pay attention to. |
1230 | Refresh our symbol table to the newly exec'd program, remove any | |
1231 | momentary bp's, etc. | |
1232 | ||
1233 | If there are breakpoints, they aren't really inserted now, | |
1234 | since the exec() transformed our inferior into a fresh set | |
1235 | of instructions. | |
1236 | ||
1237 | We want to preserve symbolic breakpoints on the list, since | |
1238 | we have hopes that they can be reset after the new a.out's | |
1239 | symbol table is read. | |
1240 | ||
1241 | However, any "raw" breakpoints must be removed from the list | |
1242 | (e.g., the solib bp's), since their address is probably invalid | |
1243 | now. | |
1244 | ||
1245 | And, we DON'T want to call delete_breakpoints() here, since | |
1246 | that may write the bp's "shadow contents" (the instruction | |
85102364 | 1247 | value that was overwritten with a TRAP instruction). Since |
1777feb0 | 1248 | we now have a new a.out, those shadow contents aren't valid. */ |
6c95b8df PA |
1249 | |
1250 | mark_breakpoints_out (); | |
1251 | ||
95e50b27 PA |
1252 | /* The target reports the exec event to the main thread, even if |
1253 | some other thread does the exec, and even if the main thread was | |
1254 | stopped or already gone. We may still have non-leader threads of | |
1255 | the process on our list. E.g., on targets that don't have thread | |
6a534f85 PA |
1256 | exit events (like remote) and nothing forces an update of the |
1257 | thread list up to here. When debugging remotely, it's best to | |
95e50b27 PA |
1258 | avoid extra traffic, when possible, so avoid syncing the thread |
1259 | list with the target, and instead go ahead and delete all threads | |
6a534f85 | 1260 | of the process but the one that reported the event. Note this must |
95e50b27 PA |
1261 | be done before calling update_breakpoints_after_exec, as |
1262 | otherwise clearing the threads' resources would reference stale | |
1263 | thread breakpoints -- it may have been one of these threads that | |
1264 | stepped across the exec. We could just clear their stepping | |
1265 | states, but as long as we're iterating, might as well delete | |
1266 | them. Deleting them now rather than at the next user-visible | |
1267 | stop provides a nicer sequence of events for user and MI | |
1268 | notifications. */ | |
08036331 | 1269 | for (thread_info *th : all_threads_safe ()) |
d7e15655 | 1270 | if (th->ptid.pid () == pid && th->ptid != ptid) |
00431a78 | 1271 | delete_thread (th); |
95e50b27 PA |
1272 | |
1273 | /* We also need to clear any left over stale state for the | |
1274 | leader/event thread. E.g., if there was any step-resume | |
1275 | breakpoint or similar, it's gone now. We cannot truly | |
1276 | step-to-next statement through an exec(). */ | |
08036331 | 1277 | thread_info *th = inferior_thread (); |
03acd4d8 CL |
1278 | th->control.step_resume_breakpoint = nullptr; |
1279 | th->control.exception_resume_breakpoint = nullptr; | |
1280 | th->control.single_step_breakpoints = nullptr; | |
16c381f0 JK |
1281 | th->control.step_range_start = 0; |
1282 | th->control.step_range_end = 0; | |
c906108c | 1283 | |
95e50b27 PA |
1284 | /* The user may have had the main thread held stopped in the |
1285 | previous image (e.g., schedlock on, or non-stop). Release | |
1286 | it now. */ | |
a75724bc PA |
1287 | th->stop_requested = 0; |
1288 | ||
95e50b27 PA |
1289 | update_breakpoints_after_exec (); |
1290 | ||
1777feb0 | 1291 | /* What is this a.out's name? */ |
f2907e49 | 1292 | process_ptid = ptid_t (pid); |
6cb06a8c TT |
1293 | gdb_printf (_("%s is executing new program: %s\n"), |
1294 | target_pid_to_str (process_ptid).c_str (), | |
1295 | exec_file_target); | |
c906108c SS |
1296 | |
1297 | /* We've followed the inferior through an exec. Therefore, the | |
1777feb0 | 1298 | inferior has essentially been killed & reborn. */ |
7a292a7a | 1299 | |
6ca15a4b | 1300 | breakpoint_init_inferior (inf_execd); |
e85a822c | 1301 | |
797bc1cb | 1302 | gdb::unique_xmalloc_ptr<char> exec_file_host |
03acd4d8 | 1303 | = exec_file_find (exec_file_target, nullptr); |
ff862be4 | 1304 | |
ecf45d2c SL |
1305 | /* If we were unable to map the executable target pathname onto a host |
1306 | pathname, tell the user that. Otherwise GDB's subsequent behavior | |
1307 | is confusing. Maybe it would even be better to stop at this point | |
1308 | so that the user can specify a file manually before continuing. */ | |
03acd4d8 | 1309 | if (exec_file_host == nullptr) |
ecf45d2c SL |
1310 | warning (_("Could not load symbols for executable %s.\n" |
1311 | "Do you need \"set sysroot\"?"), | |
1312 | exec_file_target); | |
c906108c | 1313 | |
cce9b6bf PA |
1314 | /* Reset the shared library package. This ensures that we get a |
1315 | shlib event when the child reaches "_start", at which point the | |
1316 | dld will have had a chance to initialize the child. */ | |
1317 | /* Also, loading a symbol file below may trigger symbol lookups, and | |
1318 | we don't want those to be satisfied by the libraries of the | |
1319 | previous incarnation of this process. */ | |
03acd4d8 | 1320 | no_shared_libraries (nullptr, 0); |
cce9b6bf | 1321 | |
4a1283c8 SM |
1322 | inferior *execing_inferior = current_inferior (); |
1323 | inferior *following_inferior; | |
294c36eb | 1324 | |
6c95b8df PA |
1325 | if (follow_exec_mode_string == follow_exec_mode_new) |
1326 | { | |
6c95b8df PA |
1327 | /* The user wants to keep the old inferior and program spaces |
1328 | around. Create a new fresh one, and switch to it. */ | |
1329 | ||
35ed81d4 SM |
1330 | /* Do exit processing for the original inferior before setting the new |
1331 | inferior's pid. Having two inferiors with the same pid would confuse | |
1332 | find_inferior_p(t)id. Transfer the terminal state and info from the | |
1333 | old to the new inferior. */ | |
4a1283c8 | 1334 | following_inferior = add_inferior_with_spaces (); |
294c36eb | 1335 | |
4a1283c8 | 1336 | swap_terminal_info (following_inferior, execing_inferior); |
9324bfea | 1337 | exit_inferior (execing_inferior); |
294c36eb | 1338 | |
4a1283c8 | 1339 | following_inferior->pid = pid; |
6c95b8df | 1340 | } |
9107fc8d PA |
1341 | else |
1342 | { | |
4a1283c8 SM |
1343 | /* follow-exec-mode is "same", we continue execution in the execing |
1344 | inferior. */ | |
1345 | following_inferior = execing_inferior; | |
1346 | ||
9107fc8d PA |
1347 | /* The old description may no longer be fit for the new image. |
1348 | E.g, a 64-bit process exec'ed a 32-bit process. Clear the | |
1349 | old description; we'll read a new one below. No need to do | |
1350 | this on "follow-exec-mode new", as the old inferior stays | |
1351 | around (its description is later cleared/refetched on | |
1352 | restart). */ | |
1353 | target_clear_description (); | |
1354 | } | |
6c95b8df | 1355 | |
4a1283c8 SM |
1356 | target_follow_exec (following_inferior, ptid, exec_file_target); |
1357 | ||
1358 | gdb_assert (current_inferior () == following_inferior); | |
1359 | gdb_assert (current_program_space == following_inferior->pspace); | |
6c95b8df | 1360 | |
ecf45d2c SL |
1361 | /* Attempt to open the exec file. SYMFILE_DEFER_BP_RESET is used |
1362 | because the proper displacement for a PIE (Position Independent | |
1363 | Executable) main symbol file will only be computed by | |
1364 | solib_create_inferior_hook below. breakpoint_re_set would fail | |
1365 | to insert the breakpoints with the zero displacement. */ | |
4a1283c8 SM |
1366 | try_open_exec_file (exec_file_host.get (), following_inferior, |
1367 | SYMFILE_DEFER_BP_RESET); | |
c906108c | 1368 | |
9107fc8d PA |
1369 | /* If the target can specify a description, read it. Must do this |
1370 | after flipping to the new executable (because the target supplied | |
1371 | description must be compatible with the executable's | |
1372 | architecture, and the old executable may e.g., be 32-bit, while | |
1373 | the new one 64-bit), and before anything involving memory or | |
1374 | registers. */ | |
1375 | target_find_description (); | |
1376 | ||
4a1283c8 | 1377 | gdb::observers::inferior_execd.notify (execing_inferior, following_inferior); |
4efc6507 | 1378 | |
c1e56572 JK |
1379 | breakpoint_re_set (); |
1380 | ||
c906108c SS |
1381 | /* Reinsert all breakpoints. (Those which were symbolic have |
1382 | been reset to the proper address in the new a.out, thanks | |
1777feb0 | 1383 | to symbol_file_command...). */ |
c906108c SS |
1384 | insert_breakpoints (); |
1385 | ||
1386 | /* The next resume of this inferior should bring it to the shlib | |
1387 | startup breakpoints. (If the user had also set bp's on | |
1388 | "main" from the old (parent) process, then they'll auto- | |
1777feb0 | 1389 | matically get reset there in the new process.). */ |
c906108c SS |
1390 | } |
1391 | ||
28d5518b | 1392 | /* The chain of threads that need to do a step-over operation to get |
c2829269 PA |
1393 | past e.g., a breakpoint. What technique is used to step over the |
1394 | breakpoint/watchpoint does not matter -- all threads end up in the | |
1395 | same queue, to maintain rough temporal order of execution, in order | |
1396 | to avoid starvation, otherwise, we could e.g., find ourselves | |
1397 | constantly stepping the same couple threads past their breakpoints | |
1398 | over and over, if the single-step finish fast enough. */ | |
8b6a69b2 | 1399 | thread_step_over_list global_thread_step_over_list; |
c2829269 | 1400 | |
6c4cfb24 PA |
1401 | /* Bit flags indicating what the thread needs to step over. */ |
1402 | ||
8d297bbf | 1403 | enum step_over_what_flag |
6c4cfb24 PA |
1404 | { |
1405 | /* Step over a breakpoint. */ | |
1406 | STEP_OVER_BREAKPOINT = 1, | |
1407 | ||
1408 | /* Step past a non-continuable watchpoint, in order to let the | |
1409 | instruction execute so we can evaluate the watchpoint | |
1410 | expression. */ | |
1411 | STEP_OVER_WATCHPOINT = 2 | |
1412 | }; | |
8d297bbf | 1413 | DEF_ENUM_FLAGS_TYPE (enum step_over_what_flag, step_over_what); |
6c4cfb24 | 1414 | |
963f9c80 | 1415 | /* Info about an instruction that is being stepped over. */ |
31e77af2 PA |
1416 | |
1417 | struct step_over_info | |
1418 | { | |
963f9c80 PA |
1419 | /* If we're stepping past a breakpoint, this is the address space |
1420 | and address of the instruction the breakpoint is set at. We'll | |
1421 | skip inserting all breakpoints here. Valid iff ASPACE is | |
1422 | non-NULL. */ | |
ac7d717c PA |
1423 | const address_space *aspace = nullptr; |
1424 | CORE_ADDR address = 0; | |
963f9c80 PA |
1425 | |
1426 | /* The instruction being stepped over triggers a nonsteppable | |
1427 | watchpoint. If true, we'll skip inserting watchpoints. */ | |
ac7d717c | 1428 | int nonsteppable_watchpoint_p = 0; |
21edc42f YQ |
1429 | |
1430 | /* The thread's global number. */ | |
ac7d717c | 1431 | int thread = -1; |
31e77af2 PA |
1432 | }; |
1433 | ||
1434 | /* The step-over info of the location that is being stepped over. | |
1435 | ||
1436 | Note that with async/breakpoint always-inserted mode, a user might | |
1437 | set a new breakpoint/watchpoint/etc. exactly while a breakpoint is | |
1438 | being stepped over. As setting a new breakpoint inserts all | |
1439 | breakpoints, we need to make sure the breakpoint being stepped over | |
1440 | isn't inserted then. We do that by only clearing the step-over | |
1441 | info when the step-over is actually finished (or aborted). | |
1442 | ||
1443 | Presently GDB can only step over one breakpoint at any given time. | |
1444 | Given threads that can't run code in the same address space as the | |
1445 | breakpoint's can't really miss the breakpoint, GDB could be taught | |
1446 | to step-over at most one breakpoint per address space (so this info | |
1447 | could move to the address space object if/when GDB is extended). | |
1448 | The set of breakpoints being stepped over will normally be much | |
1449 | smaller than the set of all breakpoints, so a flag in the | |
1450 | breakpoint location structure would be wasteful. A separate list | |
1451 | also saves complexity and run-time, as otherwise we'd have to go | |
1452 | through all breakpoint locations clearing their flag whenever we | |
1453 | start a new sequence. Similar considerations weigh against storing | |
1454 | this info in the thread object. Plus, not all step overs actually | |
1455 | have breakpoint locations -- e.g., stepping past a single-step | |
1456 | breakpoint, or stepping to complete a non-continuable | |
1457 | watchpoint. */ | |
1458 | static struct step_over_info step_over_info; | |
1459 | ||
1460 | /* Record the address of the breakpoint/instruction we're currently | |
ce0db137 DE |
1461 | stepping over. |
1462 | N.B. We record the aspace and address now, instead of say just the thread, | |
1463 | because when we need the info later the thread may be running. */ | |
31e77af2 PA |
1464 | |
1465 | static void | |
8b86c959 | 1466 | set_step_over_info (const address_space *aspace, CORE_ADDR address, |
21edc42f YQ |
1467 | int nonsteppable_watchpoint_p, |
1468 | int thread) | |
31e77af2 PA |
1469 | { |
1470 | step_over_info.aspace = aspace; | |
1471 | step_over_info.address = address; | |
963f9c80 | 1472 | step_over_info.nonsteppable_watchpoint_p = nonsteppable_watchpoint_p; |
21edc42f | 1473 | step_over_info.thread = thread; |
31e77af2 PA |
1474 | } |
1475 | ||
1476 | /* Called when we're not longer stepping over a breakpoint / an | |
1477 | instruction, so all breakpoints are free to be (re)inserted. */ | |
1478 | ||
1479 | static void | |
1480 | clear_step_over_info (void) | |
1481 | { | |
1eb8556f | 1482 | infrun_debug_printf ("clearing step over info"); |
03acd4d8 | 1483 | step_over_info.aspace = nullptr; |
31e77af2 | 1484 | step_over_info.address = 0; |
963f9c80 | 1485 | step_over_info.nonsteppable_watchpoint_p = 0; |
21edc42f | 1486 | step_over_info.thread = -1; |
31e77af2 PA |
1487 | } |
1488 | ||
7f89fd65 | 1489 | /* See infrun.h. */ |
31e77af2 PA |
1490 | |
1491 | int | |
1492 | stepping_past_instruction_at (struct address_space *aspace, | |
1493 | CORE_ADDR address) | |
1494 | { | |
03acd4d8 | 1495 | return (step_over_info.aspace != nullptr |
31e77af2 PA |
1496 | && breakpoint_address_match (aspace, address, |
1497 | step_over_info.aspace, | |
1498 | step_over_info.address)); | |
1499 | } | |
1500 | ||
963f9c80 PA |
1501 | /* See infrun.h. */ |
1502 | ||
21edc42f YQ |
1503 | int |
1504 | thread_is_stepping_over_breakpoint (int thread) | |
1505 | { | |
1506 | return (step_over_info.thread != -1 | |
1507 | && thread == step_over_info.thread); | |
1508 | } | |
1509 | ||
1510 | /* See infrun.h. */ | |
1511 | ||
963f9c80 PA |
1512 | int |
1513 | stepping_past_nonsteppable_watchpoint (void) | |
1514 | { | |
1515 | return step_over_info.nonsteppable_watchpoint_p; | |
1516 | } | |
1517 | ||
6cc83d2a PA |
1518 | /* Returns true if step-over info is valid. */ |
1519 | ||
c4464ade | 1520 | static bool |
6cc83d2a PA |
1521 | step_over_info_valid_p (void) |
1522 | { | |
03acd4d8 | 1523 | return (step_over_info.aspace != nullptr |
963f9c80 | 1524 | || stepping_past_nonsteppable_watchpoint ()); |
6cc83d2a PA |
1525 | } |
1526 | ||
c906108c | 1527 | \f |
237fc4c9 PA |
1528 | /* Displaced stepping. */ |
1529 | ||
1530 | /* In non-stop debugging mode, we must take special care to manage | |
1531 | breakpoints properly; in particular, the traditional strategy for | |
1532 | stepping a thread past a breakpoint it has hit is unsuitable. | |
1533 | 'Displaced stepping' is a tactic for stepping one thread past a | |
1534 | breakpoint it has hit while ensuring that other threads running | |
1535 | concurrently will hit the breakpoint as they should. | |
1536 | ||
1537 | The traditional way to step a thread T off a breakpoint in a | |
1538 | multi-threaded program in all-stop mode is as follows: | |
1539 | ||
1540 | a0) Initially, all threads are stopped, and breakpoints are not | |
1541 | inserted. | |
1542 | a1) We single-step T, leaving breakpoints uninserted. | |
1543 | a2) We insert breakpoints, and resume all threads. | |
1544 | ||
1545 | In non-stop debugging, however, this strategy is unsuitable: we | |
1546 | don't want to have to stop all threads in the system in order to | |
1547 | continue or step T past a breakpoint. Instead, we use displaced | |
1548 | stepping: | |
1549 | ||
1550 | n0) Initially, T is stopped, other threads are running, and | |
1551 | breakpoints are inserted. | |
1552 | n1) We copy the instruction "under" the breakpoint to a separate | |
1553 | location, outside the main code stream, making any adjustments | |
1554 | to the instruction, register, and memory state as directed by | |
1555 | T's architecture. | |
1556 | n2) We single-step T over the instruction at its new location. | |
1557 | n3) We adjust the resulting register and memory state as directed | |
1558 | by T's architecture. This includes resetting T's PC to point | |
1559 | back into the main instruction stream. | |
1560 | n4) We resume T. | |
1561 | ||
1562 | This approach depends on the following gdbarch methods: | |
1563 | ||
1564 | - gdbarch_max_insn_length and gdbarch_displaced_step_location | |
1565 | indicate where to copy the instruction, and how much space must | |
1566 | be reserved there. We use these in step n1. | |
1567 | ||
1568 | - gdbarch_displaced_step_copy_insn copies a instruction to a new | |
1569 | address, and makes any necessary adjustments to the instruction, | |
1570 | register contents, and memory. We use this in step n1. | |
1571 | ||
1572 | - gdbarch_displaced_step_fixup adjusts registers and memory after | |
85102364 | 1573 | we have successfully single-stepped the instruction, to yield the |
237fc4c9 PA |
1574 | same effect the instruction would have had if we had executed it |
1575 | at its original address. We use this in step n3. | |
1576 | ||
237fc4c9 PA |
1577 | The gdbarch_displaced_step_copy_insn and |
1578 | gdbarch_displaced_step_fixup functions must be written so that | |
1579 | copying an instruction with gdbarch_displaced_step_copy_insn, | |
1580 | single-stepping across the copied instruction, and then applying | |
1581 | gdbarch_displaced_insn_fixup should have the same effects on the | |
1582 | thread's memory and registers as stepping the instruction in place | |
1583 | would have. Exactly which responsibilities fall to the copy and | |
1584 | which fall to the fixup is up to the author of those functions. | |
1585 | ||
1586 | See the comments in gdbarch.sh for details. | |
1587 | ||
1588 | Note that displaced stepping and software single-step cannot | |
1589 | currently be used in combination, although with some care I think | |
1590 | they could be made to. Software single-step works by placing | |
1591 | breakpoints on all possible subsequent instructions; if the | |
1592 | displaced instruction is a PC-relative jump, those breakpoints | |
1593 | could fall in very strange places --- on pages that aren't | |
1594 | executable, or at addresses that are not proper instruction | |
1595 | boundaries. (We do generally let other threads run while we wait | |
1596 | to hit the software single-step breakpoint, and they might | |
1597 | encounter such a corrupted instruction.) One way to work around | |
1598 | this would be to have gdbarch_displaced_step_copy_insn fully | |
1599 | simulate the effect of PC-relative instructions (and return NULL) | |
1600 | on architectures that use software single-stepping. | |
1601 | ||
1602 | In non-stop mode, we can have independent and simultaneous step | |
1603 | requests, so more than one thread may need to simultaneously step | |
1604 | over a breakpoint. The current implementation assumes there is | |
1605 | only one scratch space per process. In this case, we have to | |
1606 | serialize access to the scratch space. If thread A wants to step | |
1607 | over a breakpoint, but we are currently waiting for some other | |
1608 | thread to complete a displaced step, we leave thread A stopped and | |
1609 | place it in the displaced_step_request_queue. Whenever a displaced | |
1610 | step finishes, we pick the next thread in the queue and start a new | |
1611 | displaced step operation on it. See displaced_step_prepare and | |
7def77a1 | 1612 | displaced_step_finish for details. */ |
237fc4c9 | 1613 | |
a46d1843 | 1614 | /* Return true if THREAD is doing a displaced step. */ |
c0987663 | 1615 | |
c4464ade | 1616 | static bool |
00431a78 | 1617 | displaced_step_in_progress_thread (thread_info *thread) |
c0987663 | 1618 | { |
03acd4d8 | 1619 | gdb_assert (thread != nullptr); |
c0987663 | 1620 | |
187b041e | 1621 | return thread->displaced_step_state.in_progress (); |
c0987663 YQ |
1622 | } |
1623 | ||
a46d1843 | 1624 | /* Return true if INF has a thread doing a displaced step. */ |
8f572e5c | 1625 | |
c4464ade | 1626 | static bool |
00431a78 | 1627 | displaced_step_in_progress (inferior *inf) |
8f572e5c | 1628 | { |
187b041e | 1629 | return inf->displaced_step_state.in_progress_count > 0; |
fc1cf338 PA |
1630 | } |
1631 | ||
187b041e | 1632 | /* Return true if any thread is doing a displaced step. */ |
a42244db | 1633 | |
187b041e SM |
1634 | static bool |
1635 | displaced_step_in_progress_any_thread () | |
a42244db | 1636 | { |
187b041e SM |
1637 | for (inferior *inf : all_non_exited_inferiors ()) |
1638 | { | |
1639 | if (displaced_step_in_progress (inf)) | |
1640 | return true; | |
1641 | } | |
a42244db | 1642 | |
187b041e | 1643 | return false; |
a42244db YQ |
1644 | } |
1645 | ||
fc1cf338 PA |
1646 | static void |
1647 | infrun_inferior_exit (struct inferior *inf) | |
1648 | { | |
d20172fc | 1649 | inf->displaced_step_state.reset (); |
6f5d514f | 1650 | inf->thread_waiting_for_vfork_done = nullptr; |
fc1cf338 | 1651 | } |
237fc4c9 | 1652 | |
3b7a962d | 1653 | static void |
4a1283c8 | 1654 | infrun_inferior_execd (inferior *exec_inf, inferior *follow_inf) |
3b7a962d | 1655 | { |
187b041e SM |
1656 | /* If some threads where was doing a displaced step in this inferior at the |
1657 | moment of the exec, they no longer exist. Even if the exec'ing thread | |
3b7a962d SM |
1658 | doing a displaced step, we don't want to to any fixup nor restore displaced |
1659 | stepping buffer bytes. */ | |
4a1283c8 | 1660 | follow_inf->displaced_step_state.reset (); |
3b7a962d | 1661 | |
4a1283c8 | 1662 | for (thread_info *thread : follow_inf->threads ()) |
187b041e SM |
1663 | thread->displaced_step_state.reset (); |
1664 | ||
3b7a962d SM |
1665 | /* Since an in-line step is done with everything else stopped, if there was |
1666 | one in progress at the time of the exec, it must have been the exec'ing | |
1667 | thread. */ | |
1668 | clear_step_over_info (); | |
6f5d514f | 1669 | |
4a1283c8 | 1670 | follow_inf->thread_waiting_for_vfork_done = nullptr; |
3b7a962d SM |
1671 | } |
1672 | ||
fff08868 HZ |
1673 | /* If ON, and the architecture supports it, GDB will use displaced |
1674 | stepping to step over breakpoints. If OFF, or if the architecture | |
1675 | doesn't support it, GDB will instead use the traditional | |
1676 | hold-and-step approach. If AUTO (which is the default), GDB will | |
1677 | decide which technique to use to step over breakpoints depending on | |
9822cb57 | 1678 | whether the target works in a non-stop way (see use_displaced_stepping). */ |
fff08868 | 1679 | |
72d0e2c5 | 1680 | static enum auto_boolean can_use_displaced_stepping = AUTO_BOOLEAN_AUTO; |
fff08868 | 1681 | |
237fc4c9 PA |
1682 | static void |
1683 | show_can_use_displaced_stepping (struct ui_file *file, int from_tty, | |
1684 | struct cmd_list_element *c, | |
1685 | const char *value) | |
1686 | { | |
72d0e2c5 | 1687 | if (can_use_displaced_stepping == AUTO_BOOLEAN_AUTO) |
6cb06a8c TT |
1688 | gdb_printf (file, |
1689 | _("Debugger's willingness to use displaced stepping " | |
1690 | "to step over breakpoints is %s (currently %s).\n"), | |
1691 | value, target_is_non_stop_p () ? "on" : "off"); | |
fff08868 | 1692 | else |
6cb06a8c TT |
1693 | gdb_printf (file, |
1694 | _("Debugger's willingness to use displaced stepping " | |
1695 | "to step over breakpoints is %s.\n"), value); | |
237fc4c9 PA |
1696 | } |
1697 | ||
9822cb57 SM |
1698 | /* Return true if the gdbarch implements the required methods to use |
1699 | displaced stepping. */ | |
1700 | ||
1701 | static bool | |
1702 | gdbarch_supports_displaced_stepping (gdbarch *arch) | |
1703 | { | |
187b041e SM |
1704 | /* Only check for the presence of `prepare`. The gdbarch verification ensures |
1705 | that if `prepare` is provided, so is `finish`. */ | |
1706 | return gdbarch_displaced_step_prepare_p (arch); | |
9822cb57 SM |
1707 | } |
1708 | ||
fff08868 | 1709 | /* Return non-zero if displaced stepping can/should be used to step |
3fc8eb30 | 1710 | over breakpoints of thread TP. */ |
fff08868 | 1711 | |
9822cb57 SM |
1712 | static bool |
1713 | use_displaced_stepping (thread_info *tp) | |
237fc4c9 | 1714 | { |
9822cb57 SM |
1715 | /* If the user disabled it explicitly, don't use displaced stepping. */ |
1716 | if (can_use_displaced_stepping == AUTO_BOOLEAN_FALSE) | |
1717 | return false; | |
1718 | ||
1719 | /* If "auto", only use displaced stepping if the target operates in a non-stop | |
1720 | way. */ | |
1721 | if (can_use_displaced_stepping == AUTO_BOOLEAN_AUTO | |
1722 | && !target_is_non_stop_p ()) | |
1723 | return false; | |
1724 | ||
1725 | gdbarch *gdbarch = get_thread_regcache (tp)->arch (); | |
1726 | ||
1727 | /* If the architecture doesn't implement displaced stepping, don't use | |
1728 | it. */ | |
1729 | if (!gdbarch_supports_displaced_stepping (gdbarch)) | |
1730 | return false; | |
1731 | ||
1732 | /* If recording, don't use displaced stepping. */ | |
1733 | if (find_record_target () != nullptr) | |
1734 | return false; | |
1735 | ||
9822cb57 SM |
1736 | /* If displaced stepping failed before for this inferior, don't bother trying |
1737 | again. */ | |
f5f01699 | 1738 | if (tp->inf->displaced_step_state.failed_before) |
9822cb57 SM |
1739 | return false; |
1740 | ||
1741 | return true; | |
237fc4c9 PA |
1742 | } |
1743 | ||
187b041e | 1744 | /* Simple function wrapper around displaced_step_thread_state::reset. */ |
d8d83535 | 1745 | |
237fc4c9 | 1746 | static void |
187b041e | 1747 | displaced_step_reset (displaced_step_thread_state *displaced) |
237fc4c9 | 1748 | { |
d8d83535 | 1749 | displaced->reset (); |
237fc4c9 PA |
1750 | } |
1751 | ||
d8d83535 SM |
1752 | /* A cleanup that wraps displaced_step_reset. We use this instead of, say, |
1753 | SCOPE_EXIT, because it needs to be discardable with "cleanup.release ()". */ | |
1754 | ||
1755 | using displaced_step_reset_cleanup = FORWARD_SCOPE_EXIT (displaced_step_reset); | |
237fc4c9 | 1756 | |
237fc4c9 PA |
1757 | /* Prepare to single-step, using displaced stepping. |
1758 | ||
1759 | Note that we cannot use displaced stepping when we have a signal to | |
1760 | deliver. If we have a signal to deliver and an instruction to step | |
1761 | over, then after the step, there will be no indication from the | |
1762 | target whether the thread entered a signal handler or ignored the | |
1763 | signal and stepped over the instruction successfully --- both cases | |
1764 | result in a simple SIGTRAP. In the first case we mustn't do a | |
1765 | fixup, and in the second case we must --- but we can't tell which. | |
1766 | Comments in the code for 'random signals' in handle_inferior_event | |
1767 | explain how we handle this case instead. | |
1768 | ||
bab37966 SM |
1769 | Returns DISPLACED_STEP_PREPARE_STATUS_OK if preparing was successful -- this |
1770 | thread is going to be stepped now; DISPLACED_STEP_PREPARE_STATUS_UNAVAILABLE | |
1771 | if displaced stepping this thread got queued; or | |
1772 | DISPLACED_STEP_PREPARE_STATUS_CANT if this instruction can't be displaced | |
1773 | stepped. */ | |
7f03bd92 | 1774 | |
bab37966 | 1775 | static displaced_step_prepare_status |
00431a78 | 1776 | displaced_step_prepare_throw (thread_info *tp) |
237fc4c9 | 1777 | { |
00431a78 | 1778 | regcache *regcache = get_thread_regcache (tp); |
ac7936df | 1779 | struct gdbarch *gdbarch = regcache->arch (); |
187b041e SM |
1780 | displaced_step_thread_state &disp_step_thread_state |
1781 | = tp->displaced_step_state; | |
237fc4c9 PA |
1782 | |
1783 | /* We should never reach this function if the architecture does not | |
1784 | support displaced stepping. */ | |
9822cb57 | 1785 | gdb_assert (gdbarch_supports_displaced_stepping (gdbarch)); |
237fc4c9 | 1786 | |
c2829269 PA |
1787 | /* Nor if the thread isn't meant to step over a breakpoint. */ |
1788 | gdb_assert (tp->control.trap_expected); | |
1789 | ||
c1e36e3e PA |
1790 | /* Disable range stepping while executing in the scratch pad. We |
1791 | want a single-step even if executing the displaced instruction in | |
1792 | the scratch buffer lands within the stepping range (e.g., a | |
1793 | jump/branch). */ | |
1794 | tp->control.may_range_step = 0; | |
1795 | ||
187b041e SM |
1796 | /* We are about to start a displaced step for this thread. If one is already |
1797 | in progress, something's wrong. */ | |
1798 | gdb_assert (!disp_step_thread_state.in_progress ()); | |
237fc4c9 | 1799 | |
187b041e | 1800 | if (tp->inf->displaced_step_state.unavailable) |
237fc4c9 | 1801 | { |
187b041e SM |
1802 | /* The gdbarch tells us it's not worth asking to try a prepare because |
1803 | it is likely that it will return unavailable, so don't bother asking. */ | |
237fc4c9 | 1804 | |
136821d9 | 1805 | displaced_debug_printf ("deferring step of %s", |
0fab7955 | 1806 | tp->ptid.to_string ().c_str ()); |
237fc4c9 | 1807 | |
28d5518b | 1808 | global_thread_step_over_chain_enqueue (tp); |
bab37966 | 1809 | return DISPLACED_STEP_PREPARE_STATUS_UNAVAILABLE; |
237fc4c9 | 1810 | } |
237fc4c9 | 1811 | |
187b041e | 1812 | displaced_debug_printf ("displaced-stepping %s now", |
0fab7955 | 1813 | tp->ptid.to_string ().c_str ()); |
237fc4c9 | 1814 | |
00431a78 PA |
1815 | scoped_restore_current_thread restore_thread; |
1816 | ||
1817 | switch_to_thread (tp); | |
ad53cd71 | 1818 | |
187b041e SM |
1819 | CORE_ADDR original_pc = regcache_read_pc (regcache); |
1820 | CORE_ADDR displaced_pc; | |
237fc4c9 | 1821 | |
6d84a385 AB |
1822 | /* Display the instruction we are going to displaced step. */ |
1823 | if (debug_displaced) | |
1824 | { | |
1825 | string_file tmp_stream; | |
1826 | int dislen = gdb_print_insn (gdbarch, original_pc, &tmp_stream, | |
1827 | nullptr); | |
1828 | ||
1829 | if (dislen > 0) | |
1830 | { | |
1831 | gdb::byte_vector insn_buf (dislen); | |
1832 | read_memory (original_pc, insn_buf.data (), insn_buf.size ()); | |
1833 | ||
a6e5abae | 1834 | std::string insn_bytes = bytes_to_string (insn_buf); |
6d84a385 AB |
1835 | |
1836 | displaced_debug_printf ("original insn %s: %s \t %s", | |
1837 | paddress (gdbarch, original_pc), | |
1838 | insn_bytes.c_str (), | |
1839 | tmp_stream.string ().c_str ()); | |
1840 | } | |
1841 | else | |
1842 | displaced_debug_printf ("original insn %s: invalid length: %d", | |
1843 | paddress (gdbarch, original_pc), dislen); | |
1844 | } | |
1845 | ||
187b041e SM |
1846 | displaced_step_prepare_status status |
1847 | = gdbarch_displaced_step_prepare (gdbarch, tp, displaced_pc); | |
237fc4c9 | 1848 | |
187b041e | 1849 | if (status == DISPLACED_STEP_PREPARE_STATUS_CANT) |
d35ae833 | 1850 | { |
187b041e | 1851 | displaced_debug_printf ("failed to prepare (%s)", |
0fab7955 | 1852 | tp->ptid.to_string ().c_str ()); |
d35ae833 | 1853 | |
bab37966 | 1854 | return DISPLACED_STEP_PREPARE_STATUS_CANT; |
d35ae833 | 1855 | } |
187b041e | 1856 | else if (status == DISPLACED_STEP_PREPARE_STATUS_UNAVAILABLE) |
7f03bd92 | 1857 | { |
187b041e SM |
1858 | /* Not enough displaced stepping resources available, defer this |
1859 | request by placing it the queue. */ | |
1860 | ||
1861 | displaced_debug_printf ("not enough resources available, " | |
1862 | "deferring step of %s", | |
0fab7955 | 1863 | tp->ptid.to_string ().c_str ()); |
187b041e SM |
1864 | |
1865 | global_thread_step_over_chain_enqueue (tp); | |
1866 | ||
1867 | return DISPLACED_STEP_PREPARE_STATUS_UNAVAILABLE; | |
7f03bd92 | 1868 | } |
237fc4c9 | 1869 | |
187b041e SM |
1870 | gdb_assert (status == DISPLACED_STEP_PREPARE_STATUS_OK); |
1871 | ||
9f5a595d UW |
1872 | /* Save the information we need to fix things up if the step |
1873 | succeeds. */ | |
187b041e | 1874 | disp_step_thread_state.set (gdbarch); |
9f5a595d | 1875 | |
187b041e | 1876 | tp->inf->displaced_step_state.in_progress_count++; |
ad53cd71 | 1877 | |
187b041e SM |
1878 | displaced_debug_printf ("prepared successfully thread=%s, " |
1879 | "original_pc=%s, displaced_pc=%s", | |
0fab7955 | 1880 | tp->ptid.to_string ().c_str (), |
187b041e SM |
1881 | paddress (gdbarch, original_pc), |
1882 | paddress (gdbarch, displaced_pc)); | |
237fc4c9 | 1883 | |
6d84a385 AB |
1884 | /* Display the new displaced instruction(s). */ |
1885 | if (debug_displaced) | |
1886 | { | |
1887 | string_file tmp_stream; | |
1888 | CORE_ADDR addr = displaced_pc; | |
1889 | ||
1890 | /* If displaced stepping is going to use h/w single step then we know | |
1891 | that the replacement instruction can only be a single instruction, | |
1892 | in that case set the end address at the next byte. | |
1893 | ||
1894 | Otherwise the displaced stepping copy instruction routine could | |
1895 | have generated multiple instructions, and all we know is that they | |
1896 | must fit within the LEN bytes of the buffer. */ | |
1897 | CORE_ADDR end | |
1898 | = addr + (gdbarch_displaced_step_hw_singlestep (gdbarch) | |
1899 | ? 1 : gdbarch_displaced_step_buffer_length (gdbarch)); | |
1900 | ||
1901 | while (addr < end) | |
1902 | { | |
1903 | int dislen = gdb_print_insn (gdbarch, addr, &tmp_stream, nullptr); | |
1904 | if (dislen <= 0) | |
1905 | { | |
1906 | displaced_debug_printf | |
1907 | ("replacement insn %s: invalid length: %d", | |
1908 | paddress (gdbarch, addr), dislen); | |
1909 | break; | |
1910 | } | |
1911 | ||
1912 | gdb::byte_vector insn_buf (dislen); | |
1913 | read_memory (addr, insn_buf.data (), insn_buf.size ()); | |
1914 | ||
a6e5abae | 1915 | std::string insn_bytes = bytes_to_string (insn_buf); |
6d84a385 AB |
1916 | std::string insn_str = tmp_stream.release (); |
1917 | displaced_debug_printf ("replacement insn %s: %s \t %s", | |
1918 | paddress (gdbarch, addr), | |
1919 | insn_bytes.c_str (), | |
1920 | insn_str.c_str ()); | |
1921 | addr += dislen; | |
1922 | } | |
1923 | } | |
1924 | ||
bab37966 | 1925 | return DISPLACED_STEP_PREPARE_STATUS_OK; |
237fc4c9 PA |
1926 | } |
1927 | ||
3fc8eb30 PA |
1928 | /* Wrapper for displaced_step_prepare_throw that disabled further |
1929 | attempts at displaced stepping if we get a memory error. */ | |
1930 | ||
bab37966 | 1931 | static displaced_step_prepare_status |
00431a78 | 1932 | displaced_step_prepare (thread_info *thread) |
3fc8eb30 | 1933 | { |
bab37966 SM |
1934 | displaced_step_prepare_status status |
1935 | = DISPLACED_STEP_PREPARE_STATUS_CANT; | |
3fc8eb30 | 1936 | |
a70b8144 | 1937 | try |
3fc8eb30 | 1938 | { |
bab37966 | 1939 | status = displaced_step_prepare_throw (thread); |
3fc8eb30 | 1940 | } |
230d2906 | 1941 | catch (const gdb_exception_error &ex) |
3fc8eb30 | 1942 | { |
16b41842 PA |
1943 | if (ex.error != MEMORY_ERROR |
1944 | && ex.error != NOT_SUPPORTED_ERROR) | |
eedc3f4f | 1945 | throw; |
3fc8eb30 | 1946 | |
1eb8556f SM |
1947 | infrun_debug_printf ("caught exception, disabling displaced stepping: %s", |
1948 | ex.what ()); | |
3fc8eb30 PA |
1949 | |
1950 | /* Be verbose if "set displaced-stepping" is "on", silent if | |
1951 | "auto". */ | |
1952 | if (can_use_displaced_stepping == AUTO_BOOLEAN_TRUE) | |
1953 | { | |
fd7dcb94 | 1954 | warning (_("disabling displaced stepping: %s"), |
3d6e9d23 | 1955 | ex.what ()); |
3fc8eb30 PA |
1956 | } |
1957 | ||
1958 | /* Disable further displaced stepping attempts. */ | |
f5f01699 | 1959 | thread->inf->displaced_step_state.failed_before = 1; |
3fc8eb30 | 1960 | } |
3fc8eb30 | 1961 | |
bab37966 | 1962 | return status; |
3fc8eb30 PA |
1963 | } |
1964 | ||
9488c327 PA |
1965 | /* True if any thread of TARGET that matches RESUME_PTID requires |
1966 | target_thread_events enabled. This assumes TARGET does not support | |
1967 | target thread options. */ | |
1968 | ||
1969 | static bool | |
1970 | any_thread_needs_target_thread_events (process_stratum_target *target, | |
1971 | ptid_t resume_ptid) | |
1972 | { | |
1973 | for (thread_info *tp : all_non_exited_threads (target, resume_ptid)) | |
1974 | if (displaced_step_in_progress_thread (tp) | |
1975 | || schedlock_applies (tp) | |
1976 | || tp->thread_fsm () != nullptr) | |
1977 | return true; | |
1978 | return false; | |
1979 | } | |
1980 | ||
65c459ab PA |
1981 | /* Maybe disable thread-{cloned,created,exited} event reporting after |
1982 | a step-over (either in-line or displaced) finishes. */ | |
1983 | ||
1984 | static void | |
21d48304 PA |
1985 | update_thread_events_after_step_over (thread_info *event_thread, |
1986 | const target_waitstatus &event_status) | |
65c459ab | 1987 | { |
7ac958f2 PA |
1988 | if (schedlock_applies (event_thread)) |
1989 | { | |
1990 | /* If scheduler-locking applies, continue reporting | |
1991 | thread-created/thread-cloned events. */ | |
1992 | return; | |
1993 | } | |
1994 | else if (target_supports_set_thread_options (0)) | |
65c459ab PA |
1995 | { |
1996 | /* We can control per-thread options. Disable events for the | |
21d48304 PA |
1997 | event thread, unless the thread is gone. */ |
1998 | if (event_status.kind () != TARGET_WAITKIND_THREAD_EXITED) | |
1999 | event_thread->set_thread_options (0); | |
65c459ab PA |
2000 | } |
2001 | else | |
2002 | { | |
2003 | /* We can only control the target-wide target_thread_events | |
9488c327 PA |
2004 | setting. Disable it, but only if other threads in the target |
2005 | don't need it enabled. */ | |
2006 | process_stratum_target *target = event_thread->inf->process_target (); | |
2007 | if (!any_thread_needs_target_thread_events (target, minus_one_ptid)) | |
65c459ab PA |
2008 | target_thread_events (false); |
2009 | } | |
2010 | } | |
2011 | ||
bab37966 SM |
2012 | /* If we displaced stepped an instruction successfully, adjust registers and |
2013 | memory to yield the same effect the instruction would have had if we had | |
2014 | executed it at its original address, and return | |
2015 | DISPLACED_STEP_FINISH_STATUS_OK. If the instruction didn't complete, | |
2016 | relocate the PC and return DISPLACED_STEP_FINISH_STATUS_NOT_EXECUTED. | |
372316f1 | 2017 | |
bab37966 SM |
2018 | If the thread wasn't displaced stepping, return |
2019 | DISPLACED_STEP_FINISH_STATUS_OK as well. */ | |
2020 | ||
2021 | static displaced_step_finish_status | |
58c01087 PA |
2022 | displaced_step_finish (thread_info *event_thread, |
2023 | const target_waitstatus &event_status) | |
237fc4c9 | 2024 | { |
0d36baa9 | 2025 | /* Check whether the parent is displaced stepping. */ |
0d36baa9 PA |
2026 | inferior *parent_inf = event_thread->inf; |
2027 | ||
2028 | /* If this was a fork/vfork/clone, this event indicates that the | |
2029 | displaced stepping of the syscall instruction has been done, so | |
2030 | we perform cleanup for parent here. Also note that this | |
2031 | operation also cleans up the child for vfork, because their pages | |
2032 | are shared. */ | |
2033 | ||
2034 | /* If this is a fork (child gets its own address space copy) and | |
2035 | some displaced step buffers were in use at the time of the fork, | |
2036 | restore the displaced step buffer bytes in the child process. | |
2037 | ||
2038 | Architectures which support displaced stepping and fork events | |
2039 | must supply an implementation of | |
2040 | gdbarch_displaced_step_restore_all_in_ptid. This is not enforced | |
2041 | during gdbarch validation to support architectures which support | |
2042 | displaced stepping but not forks. */ | |
249d0812 PA |
2043 | if (event_status.kind () == TARGET_WAITKIND_FORKED) |
2044 | { | |
2045 | struct regcache *parent_regcache = get_thread_regcache (event_thread); | |
2046 | struct gdbarch *gdbarch = parent_regcache->arch (); | |
2047 | ||
2048 | if (gdbarch_supports_displaced_stepping (gdbarch)) | |
2049 | gdbarch_displaced_step_restore_all_in_ptid | |
2050 | (gdbarch, parent_inf, event_status.child_ptid ()); | |
2051 | } | |
0d36baa9 | 2052 | |
187b041e | 2053 | displaced_step_thread_state *displaced = &event_thread->displaced_step_state; |
fc1cf338 | 2054 | |
187b041e SM |
2055 | /* Was this thread performing a displaced step? */ |
2056 | if (!displaced->in_progress ()) | |
bab37966 | 2057 | return DISPLACED_STEP_FINISH_STATUS_OK; |
237fc4c9 | 2058 | |
21d48304 | 2059 | update_thread_events_after_step_over (event_thread, event_status); |
65c459ab | 2060 | |
187b041e SM |
2061 | gdb_assert (event_thread->inf->displaced_step_state.in_progress_count > 0); |
2062 | event_thread->inf->displaced_step_state.in_progress_count--; | |
2063 | ||
cb71640d PA |
2064 | /* Fixup may need to read memory/registers. Switch to the thread |
2065 | that we're fixing up. Also, target_stopped_by_watchpoint checks | |
d43b7a2d | 2066 | the current thread, and displaced_step_restore performs ptid-dependent |
328d42d8 | 2067 | memory accesses using current_inferior(). */ |
00431a78 | 2068 | switch_to_thread (event_thread); |
cb71640d | 2069 | |
d43b7a2d TBA |
2070 | displaced_step_reset_cleanup cleanup (displaced); |
2071 | ||
187b041e SM |
2072 | /* Do the fixup, and release the resources acquired to do the displaced |
2073 | step. */ | |
0d36baa9 PA |
2074 | displaced_step_finish_status status |
2075 | = gdbarch_displaced_step_finish (displaced->get_original_gdbarch (), | |
2076 | event_thread, event_status); | |
2077 | ||
2078 | if (event_status.kind () == TARGET_WAITKIND_FORKED | |
2079 | || event_status.kind () == TARGET_WAITKIND_VFORKED | |
2080 | || event_status.kind () == TARGET_WAITKIND_THREAD_CLONED) | |
2081 | { | |
2082 | /* Since the vfork/fork/clone syscall instruction was executed | |
2083 | in the scratchpad, the child's PC is also within the | |
2084 | scratchpad. Set the child's PC to the parent's PC value, | |
2085 | which has already been fixed up. Note: we use the parent's | |
2086 | aspace here, although we're touching the child, because the | |
2087 | child hasn't been added to the inferior list yet at this | |
2088 | point. */ | |
2089 | ||
249d0812 PA |
2090 | struct regcache *parent_regcache = get_thread_regcache (event_thread); |
2091 | struct gdbarch *gdbarch = parent_regcache->arch (); | |
0d36baa9 | 2092 | struct regcache *child_regcache |
74387712 SM |
2093 | = get_thread_arch_regcache (parent_inf, event_status.child_ptid (), |
2094 | gdbarch); | |
0d36baa9 | 2095 | /* Read PC value of parent. */ |
249d0812 | 2096 | CORE_ADDR parent_pc = regcache_read_pc (parent_regcache); |
0d36baa9 PA |
2097 | |
2098 | displaced_debug_printf ("write child pc from %s to %s", | |
2099 | paddress (gdbarch, | |
2100 | regcache_read_pc (child_regcache)), | |
2101 | paddress (gdbarch, parent_pc)); | |
2102 | ||
2103 | regcache_write_pc (child_regcache, parent_pc); | |
2104 | } | |
2105 | ||
2106 | return status; | |
c2829269 | 2107 | } |
1c5cfe86 | 2108 | |
4d9d9d04 PA |
2109 | /* Data to be passed around while handling an event. This data is |
2110 | discarded between events. */ | |
2111 | struct execution_control_state | |
2112 | { | |
aa563d16 TT |
2113 | explicit execution_control_state (thread_info *thr = nullptr) |
2114 | : ptid (thr == nullptr ? null_ptid : thr->ptid), | |
2115 | event_thread (thr) | |
183be222 | 2116 | { |
183be222 SM |
2117 | } |
2118 | ||
aa563d16 | 2119 | process_stratum_target *target = nullptr; |
4d9d9d04 PA |
2120 | ptid_t ptid; |
2121 | /* The thread that got the event, if this was a thread event; NULL | |
2122 | otherwise. */ | |
2123 | struct thread_info *event_thread; | |
2124 | ||
2125 | struct target_waitstatus ws; | |
aa563d16 | 2126 | int stop_func_filled_in = 0; |
2a8339b7 | 2127 | CORE_ADDR stop_func_alt_start = 0; |
aa563d16 TT |
2128 | CORE_ADDR stop_func_start = 0; |
2129 | CORE_ADDR stop_func_end = 0; | |
2130 | const char *stop_func_name = nullptr; | |
2131 | int wait_some_more = 0; | |
4d9d9d04 PA |
2132 | |
2133 | /* True if the event thread hit the single-step breakpoint of | |
2134 | another thread. Thus the event doesn't cause a stop, the thread | |
2135 | needs to be single-stepped past the single-step breakpoint before | |
2136 | we can switch back to the original stepping thread. */ | |
aa563d16 | 2137 | int hit_singlestep_breakpoint = 0; |
4d9d9d04 PA |
2138 | }; |
2139 | ||
4d9d9d04 PA |
2140 | static void keep_going_pass_signal (struct execution_control_state *ecs); |
2141 | static void prepare_to_wait (struct execution_control_state *ecs); | |
c4464ade | 2142 | static bool keep_going_stepped_thread (struct thread_info *tp); |
8d297bbf | 2143 | static step_over_what thread_still_needs_step_over (struct thread_info *tp); |
4d9d9d04 PA |
2144 | |
2145 | /* Are there any pending step-over requests? If so, run all we can | |
2146 | now and return true. Otherwise, return false. */ | |
2147 | ||
c4464ade | 2148 | static bool |
c2829269 PA |
2149 | start_step_over (void) |
2150 | { | |
3ec3145c SM |
2151 | INFRUN_SCOPED_DEBUG_ENTER_EXIT; |
2152 | ||
372316f1 PA |
2153 | /* Don't start a new step-over if we already have an in-line |
2154 | step-over operation ongoing. */ | |
2155 | if (step_over_info_valid_p ()) | |
c4464ade | 2156 | return false; |
372316f1 | 2157 | |
187b041e SM |
2158 | /* Steal the global thread step over chain. As we try to initiate displaced |
2159 | steps, threads will be enqueued in the global chain if no buffers are | |
2160 | available. If we iterated on the global chain directly, we might iterate | |
2161 | indefinitely. */ | |
8b6a69b2 SM |
2162 | thread_step_over_list threads_to_step |
2163 | = std::move (global_thread_step_over_list); | |
187b041e SM |
2164 | |
2165 | infrun_debug_printf ("stealing global queue of threads to step, length = %d", | |
2166 | thread_step_over_chain_length (threads_to_step)); | |
2167 | ||
2168 | bool started = false; | |
2169 | ||
2170 | /* On scope exit (whatever the reason, return or exception), if there are | |
2171 | threads left in the THREADS_TO_STEP chain, put back these threads in the | |
2172 | global list. */ | |
2173 | SCOPE_EXIT | |
2174 | { | |
8b6a69b2 | 2175 | if (threads_to_step.empty ()) |
187b041e SM |
2176 | infrun_debug_printf ("step-over queue now empty"); |
2177 | else | |
2178 | { | |
2179 | infrun_debug_printf ("putting back %d threads to step in global queue", | |
2180 | thread_step_over_chain_length (threads_to_step)); | |
2181 | ||
8b6a69b2 SM |
2182 | global_thread_step_over_chain_enqueue_chain |
2183 | (std::move (threads_to_step)); | |
187b041e SM |
2184 | } |
2185 | }; | |
2186 | ||
8b6a69b2 SM |
2187 | thread_step_over_list_safe_range range |
2188 | = make_thread_step_over_list_safe_range (threads_to_step); | |
2189 | ||
2190 | for (thread_info *tp : range) | |
237fc4c9 | 2191 | { |
8d297bbf | 2192 | step_over_what step_what; |
372316f1 | 2193 | int must_be_in_line; |
c2829269 | 2194 | |
c65d6b55 PA |
2195 | gdb_assert (!tp->stop_requested); |
2196 | ||
187b041e SM |
2197 | if (tp->inf->displaced_step_state.unavailable) |
2198 | { | |
2199 | /* The arch told us to not even try preparing another displaced step | |
2200 | for this inferior. Just leave the thread in THREADS_TO_STEP, it | |
2201 | will get moved to the global chain on scope exit. */ | |
2202 | continue; | |
2203 | } | |
2204 | ||
d8bbae6e SM |
2205 | if (tp->inf->thread_waiting_for_vfork_done != nullptr) |
2206 | { | |
2207 | /* When we stop all threads, handling a vfork, any thread in the step | |
2208 | over chain remains there. A user could also try to continue a | |
2209 | thread stopped at a breakpoint while another thread is waiting for | |
2210 | a vfork-done event. In any case, we don't want to start a step | |
2211 | over right now. */ | |
2212 | continue; | |
2213 | } | |
2214 | ||
187b041e SM |
2215 | /* Remove thread from the THREADS_TO_STEP chain. If anything goes wrong |
2216 | while we try to prepare the displaced step, we don't add it back to | |
2217 | the global step over chain. This is to avoid a thread staying in the | |
2218 | step over chain indefinitely if something goes wrong when resuming it | |
2219 | If the error is intermittent and it still needs a step over, it will | |
2220 | get enqueued again when we try to resume it normally. */ | |
8b6a69b2 | 2221 | threads_to_step.erase (threads_to_step.iterator_to (*tp)); |
c2829269 | 2222 | |
372316f1 PA |
2223 | step_what = thread_still_needs_step_over (tp); |
2224 | must_be_in_line = ((step_what & STEP_OVER_WATCHPOINT) | |
2225 | || ((step_what & STEP_OVER_BREAKPOINT) | |
3fc8eb30 | 2226 | && !use_displaced_stepping (tp))); |
372316f1 PA |
2227 | |
2228 | /* We currently stop all threads of all processes to step-over | |
2229 | in-line. If we need to start a new in-line step-over, let | |
2230 | any pending displaced steps finish first. */ | |
187b041e SM |
2231 | if (must_be_in_line && displaced_step_in_progress_any_thread ()) |
2232 | { | |
2233 | global_thread_step_over_chain_enqueue (tp); | |
2234 | continue; | |
2235 | } | |
c2829269 | 2236 | |
372316f1 | 2237 | if (tp->control.trap_expected |
7846f3aa | 2238 | || tp->resumed () |
611841bb | 2239 | || tp->executing ()) |
ad53cd71 | 2240 | { |
f34652de | 2241 | internal_error ("[%s] has inconsistent state: " |
372316f1 | 2242 | "trap_expected=%d, resumed=%d, executing=%d\n", |
0fab7955 | 2243 | tp->ptid.to_string ().c_str (), |
4d9d9d04 | 2244 | tp->control.trap_expected, |
7846f3aa | 2245 | tp->resumed (), |
611841bb | 2246 | tp->executing ()); |
ad53cd71 | 2247 | } |
1c5cfe86 | 2248 | |
1eb8556f | 2249 | infrun_debug_printf ("resuming [%s] for step-over", |
0fab7955 | 2250 | tp->ptid.to_string ().c_str ()); |
4d9d9d04 PA |
2251 | |
2252 | /* keep_going_pass_signal skips the step-over if the breakpoint | |
2253 | is no longer inserted. In all-stop, we want to keep looking | |
2254 | for a thread that needs a step-over instead of resuming TP, | |
2255 | because we wouldn't be able to resume anything else until the | |
2256 | target stops again. In non-stop, the resume always resumes | |
2257 | only TP, so it's OK to let the thread resume freely. */ | |
fbea99ea | 2258 | if (!target_is_non_stop_p () && !step_what) |
4d9d9d04 | 2259 | continue; |
8550d3b3 | 2260 | |
00431a78 | 2261 | switch_to_thread (tp); |
aa563d16 TT |
2262 | execution_control_state ecs (tp); |
2263 | keep_going_pass_signal (&ecs); | |
1c5cfe86 | 2264 | |
aa563d16 | 2265 | if (!ecs.wait_some_more) |
4d9d9d04 | 2266 | error (_("Command aborted.")); |
1c5cfe86 | 2267 | |
187b041e SM |
2268 | /* If the thread's step over could not be initiated because no buffers |
2269 | were available, it was re-added to the global step over chain. */ | |
7846f3aa | 2270 | if (tp->resumed ()) |
187b041e SM |
2271 | { |
2272 | infrun_debug_printf ("[%s] was resumed.", | |
0fab7955 | 2273 | tp->ptid.to_string ().c_str ()); |
187b041e SM |
2274 | gdb_assert (!thread_is_in_step_over_chain (tp)); |
2275 | } | |
2276 | else | |
2277 | { | |
2278 | infrun_debug_printf ("[%s] was NOT resumed.", | |
0fab7955 | 2279 | tp->ptid.to_string ().c_str ()); |
187b041e SM |
2280 | gdb_assert (thread_is_in_step_over_chain (tp)); |
2281 | } | |
372316f1 PA |
2282 | |
2283 | /* If we started a new in-line step-over, we're done. */ | |
2284 | if (step_over_info_valid_p ()) | |
2285 | { | |
2286 | gdb_assert (tp->control.trap_expected); | |
187b041e SM |
2287 | started = true; |
2288 | break; | |
372316f1 PA |
2289 | } |
2290 | ||
fbea99ea | 2291 | if (!target_is_non_stop_p ()) |
4d9d9d04 PA |
2292 | { |
2293 | /* On all-stop, shouldn't have resumed unless we needed a | |
2294 | step over. */ | |
2295 | gdb_assert (tp->control.trap_expected | |
2296 | || tp->step_after_step_resume_breakpoint); | |
2297 | ||
2298 | /* With remote targets (at least), in all-stop, we can't | |
2299 | issue any further remote commands until the program stops | |
2300 | again. */ | |
187b041e SM |
2301 | started = true; |
2302 | break; | |
1c5cfe86 | 2303 | } |
c2829269 | 2304 | |
4d9d9d04 PA |
2305 | /* Either the thread no longer needed a step-over, or a new |
2306 | displaced stepping sequence started. Even in the latter | |
2307 | case, continue looking. Maybe we can also start another | |
2308 | displaced step on a thread of other process. */ | |
237fc4c9 | 2309 | } |
4d9d9d04 | 2310 | |
187b041e | 2311 | return started; |
237fc4c9 PA |
2312 | } |
2313 | ||
5231c1fd PA |
2314 | /* Update global variables holding ptids to hold NEW_PTID if they were |
2315 | holding OLD_PTID. */ | |
2316 | static void | |
b161a60d SM |
2317 | infrun_thread_ptid_changed (process_stratum_target *target, |
2318 | ptid_t old_ptid, ptid_t new_ptid) | |
5231c1fd | 2319 | { |
b161a60d SM |
2320 | if (inferior_ptid == old_ptid |
2321 | && current_inferior ()->process_target () == target) | |
5231c1fd | 2322 | inferior_ptid = new_ptid; |
5231c1fd PA |
2323 | } |
2324 | ||
237fc4c9 | 2325 | \f |
c906108c | 2326 | |
53904c9e AC |
2327 | static const char schedlock_off[] = "off"; |
2328 | static const char schedlock_on[] = "on"; | |
2329 | static const char schedlock_step[] = "step"; | |
f2665db5 | 2330 | static const char schedlock_replay[] = "replay"; |
40478521 | 2331 | static const char *const scheduler_enums[] = { |
ef346e04 AC |
2332 | schedlock_off, |
2333 | schedlock_on, | |
2334 | schedlock_step, | |
f2665db5 | 2335 | schedlock_replay, |
03acd4d8 | 2336 | nullptr |
ef346e04 | 2337 | }; |
f2665db5 | 2338 | static const char *scheduler_mode = schedlock_replay; |
920d2a44 AC |
2339 | static void |
2340 | show_scheduler_mode (struct ui_file *file, int from_tty, | |
2341 | struct cmd_list_element *c, const char *value) | |
2342 | { | |
6cb06a8c TT |
2343 | gdb_printf (file, |
2344 | _("Mode for locking scheduler " | |
2345 | "during execution is \"%s\".\n"), | |
2346 | value); | |
920d2a44 | 2347 | } |
c906108c SS |
2348 | |
2349 | static void | |
eb4c3f4a | 2350 | set_schedlock_func (const char *args, int from_tty, struct cmd_list_element *c) |
c906108c | 2351 | { |
8a3ecb79 | 2352 | if (!target_can_lock_scheduler ()) |
eefe576e AC |
2353 | { |
2354 | scheduler_mode = schedlock_off; | |
d777bf0d SM |
2355 | error (_("Target '%s' cannot support this command."), |
2356 | target_shortname ()); | |
eefe576e | 2357 | } |
c906108c SS |
2358 | } |
2359 | ||
d4db2f36 PA |
2360 | /* True if execution commands resume all threads of all processes by |
2361 | default; otherwise, resume only threads of the current inferior | |
2362 | process. */ | |
491144b5 | 2363 | bool sched_multi = false; |
d4db2f36 | 2364 | |
22b11ba9 LS |
2365 | /* Try to setup for software single stepping. Return true if target_resume() |
2366 | should use hardware single step. | |
2facfe5c | 2367 | |
22b11ba9 | 2368 | GDBARCH the current gdbarch. */ |
2facfe5c | 2369 | |
c4464ade | 2370 | static bool |
22b11ba9 | 2371 | maybe_software_singlestep (struct gdbarch *gdbarch) |
2facfe5c | 2372 | { |
c4464ade | 2373 | bool hw_step = true; |
2facfe5c | 2374 | |
f02253f1 | 2375 | if (execution_direction == EXEC_FORWARD |
93f9a11f YQ |
2376 | && gdbarch_software_single_step_p (gdbarch)) |
2377 | hw_step = !insert_single_step_breakpoints (gdbarch); | |
2378 | ||
2facfe5c DD |
2379 | return hw_step; |
2380 | } | |
c906108c | 2381 | |
f3263aa4 PA |
2382 | /* See infrun.h. */ |
2383 | ||
09cee04b PA |
2384 | ptid_t |
2385 | user_visible_resume_ptid (int step) | |
2386 | { | |
f3263aa4 | 2387 | ptid_t resume_ptid; |
09cee04b | 2388 | |
09cee04b PA |
2389 | if (non_stop) |
2390 | { | |
2391 | /* With non-stop mode on, threads are always handled | |
2392 | individually. */ | |
2393 | resume_ptid = inferior_ptid; | |
2394 | } | |
2395 | else if ((scheduler_mode == schedlock_on) | |
03d46957 | 2396 | || (scheduler_mode == schedlock_step && step)) |
09cee04b | 2397 | { |
f3263aa4 PA |
2398 | /* User-settable 'scheduler' mode requires solo thread |
2399 | resume. */ | |
09cee04b PA |
2400 | resume_ptid = inferior_ptid; |
2401 | } | |
f2665db5 MM |
2402 | else if ((scheduler_mode == schedlock_replay) |
2403 | && target_record_will_replay (minus_one_ptid, execution_direction)) | |
2404 | { | |
2405 | /* User-settable 'scheduler' mode requires solo thread resume in replay | |
2406 | mode. */ | |
2407 | resume_ptid = inferior_ptid; | |
2408 | } | |
f3263aa4 PA |
2409 | else if (!sched_multi && target_supports_multi_process ()) |
2410 | { | |
2411 | /* Resume all threads of the current process (and none of other | |
2412 | processes). */ | |
e99b03dc | 2413 | resume_ptid = ptid_t (inferior_ptid.pid ()); |
f3263aa4 PA |
2414 | } |
2415 | else | |
2416 | { | |
2417 | /* Resume all threads of all processes. */ | |
2418 | resume_ptid = RESUME_ALL; | |
2419 | } | |
09cee04b PA |
2420 | |
2421 | return resume_ptid; | |
2422 | } | |
2423 | ||
5b6d1e4f PA |
2424 | /* See infrun.h. */ |
2425 | ||
2426 | process_stratum_target * | |
2427 | user_visible_resume_target (ptid_t resume_ptid) | |
2428 | { | |
2429 | return (resume_ptid == minus_one_ptid && sched_multi | |
03acd4d8 | 2430 | ? nullptr |
5b6d1e4f PA |
2431 | : current_inferior ()->process_target ()); |
2432 | } | |
2433 | ||
bd9482bc PA |
2434 | /* Find a thread from the inferiors that we'll resume that is waiting |
2435 | for a vfork-done event. */ | |
2436 | ||
2437 | static thread_info * | |
2438 | find_thread_waiting_for_vfork_done () | |
2439 | { | |
2440 | gdb_assert (!target_is_non_stop_p ()); | |
2441 | ||
2442 | if (sched_multi) | |
2443 | { | |
2444 | for (inferior *inf : all_non_exited_inferiors ()) | |
2445 | if (inf->thread_waiting_for_vfork_done != nullptr) | |
2446 | return inf->thread_waiting_for_vfork_done; | |
2447 | } | |
2448 | else | |
2449 | { | |
2450 | inferior *cur_inf = current_inferior (); | |
2451 | if (cur_inf->thread_waiting_for_vfork_done != nullptr) | |
2452 | return cur_inf->thread_waiting_for_vfork_done; | |
2453 | } | |
2454 | return nullptr; | |
2455 | } | |
2456 | ||
fbea99ea PA |
2457 | /* Return a ptid representing the set of threads that we will resume, |
2458 | in the perspective of the target, assuming run control handling | |
2459 | does not require leaving some threads stopped (e.g., stepping past | |
2460 | breakpoint). USER_STEP indicates whether we're about to start the | |
2461 | target for a stepping command. */ | |
2462 | ||
2463 | static ptid_t | |
2464 | internal_resume_ptid (int user_step) | |
2465 | { | |
2466 | /* In non-stop, we always control threads individually. Note that | |
2467 | the target may always work in non-stop mode even with "set | |
2468 | non-stop off", in which case user_visible_resume_ptid could | |
2469 | return a wildcard ptid. */ | |
2470 | if (target_is_non_stop_p ()) | |
2471 | return inferior_ptid; | |
d8bbae6e SM |
2472 | |
2473 | /* The rest of the function assumes non-stop==off and | |
2474 | target-non-stop==off. | |
2475 | ||
2476 | If a thread is waiting for a vfork-done event, it means breakpoints are out | |
2477 | for this inferior (well, program space in fact). We don't want to resume | |
2478 | any thread other than the one waiting for vfork done, otherwise these other | |
2479 | threads could miss breakpoints. So if a thread in the resumption set is | |
2480 | waiting for a vfork-done event, resume only that thread. | |
2481 | ||
2482 | The resumption set width depends on whether schedule-multiple is on or off. | |
2483 | ||
2484 | Note that if the target_resume interface was more flexible, we could be | |
2485 | smarter here when schedule-multiple is on. For example, imagine 3 | |
2486 | inferiors with 2 threads each (1.1, 1.2, 2.1, 2.2, 3.1 and 3.2). Threads | |
2487 | 2.1 and 3.2 are both waiting for a vfork-done event. Then we could ask the | |
2488 | target(s) to resume: | |
2489 | ||
2490 | - All threads of inferior 1 | |
2491 | - Thread 2.1 | |
2492 | - Thread 3.2 | |
2493 | ||
2494 | Since we don't have that flexibility (we can only pass one ptid), just | |
2495 | resume the first thread waiting for a vfork-done event we find (e.g. thread | |
2496 | 2.1). */ | |
bd9482bc PA |
2497 | thread_info *thr = find_thread_waiting_for_vfork_done (); |
2498 | if (thr != nullptr) | |
d8bbae6e | 2499 | { |
bd9482bc PA |
2500 | /* If we have a thread that is waiting for a vfork-done event, |
2501 | then we should have switched to it earlier. Calling | |
2502 | target_resume with thread scope is only possible when the | |
2503 | current thread matches the thread scope. */ | |
2504 | gdb_assert (thr->ptid == inferior_ptid); | |
2505 | gdb_assert (thr->inf->process_target () | |
2506 | == inferior_thread ()->inf->process_target ()); | |
2507 | return thr->ptid; | |
d8bbae6e | 2508 | } |
d8bbae6e SM |
2509 | |
2510 | return user_visible_resume_ptid (user_step); | |
fbea99ea PA |
2511 | } |
2512 | ||
64ce06e4 PA |
2513 | /* Wrapper for target_resume, that handles infrun-specific |
2514 | bookkeeping. */ | |
2515 | ||
2516 | static void | |
c4464ade | 2517 | do_target_resume (ptid_t resume_ptid, bool step, enum gdb_signal sig) |
64ce06e4 PA |
2518 | { |
2519 | struct thread_info *tp = inferior_thread (); | |
2520 | ||
c65d6b55 PA |
2521 | gdb_assert (!tp->stop_requested); |
2522 | ||
64ce06e4 | 2523 | /* Install inferior's terminal modes. */ |
223ffa71 | 2524 | target_terminal::inferior (); |
64ce06e4 PA |
2525 | |
2526 | /* Avoid confusing the next resume, if the next stop/resume | |
2527 | happens to apply to another thread. */ | |
1edb66d8 | 2528 | tp->set_stop_signal (GDB_SIGNAL_0); |
64ce06e4 | 2529 | |
8f572e5c PA |
2530 | /* Advise target which signals may be handled silently. |
2531 | ||
2532 | If we have removed breakpoints because we are stepping over one | |
2533 | in-line (in any thread), we need to receive all signals to avoid | |
2534 | accidentally skipping a breakpoint during execution of a signal | |
2535 | handler. | |
2536 | ||
2537 | Likewise if we're displaced stepping, otherwise a trap for a | |
2538 | breakpoint in a signal handler might be confused with the | |
7def77a1 | 2539 | displaced step finishing. We don't make the displaced_step_finish |
8f572e5c PA |
2540 | step distinguish the cases instead, because: |
2541 | ||
2542 | - a backtrace while stopped in the signal handler would show the | |
2543 | scratch pad as frame older than the signal handler, instead of | |
2544 | the real mainline code. | |
2545 | ||
2546 | - when the thread is later resumed, the signal handler would | |
2547 | return to the scratch pad area, which would no longer be | |
2548 | valid. */ | |
2549 | if (step_over_info_valid_p () | |
00431a78 | 2550 | || displaced_step_in_progress (tp->inf)) |
adc6a863 | 2551 | target_pass_signals ({}); |
64ce06e4 | 2552 | else |
adc6a863 | 2553 | target_pass_signals (signal_pass); |
64ce06e4 | 2554 | |
d8d96409 PA |
2555 | /* Request that the target report thread-{created,cloned,exited} |
2556 | events in the following situations: | |
65c459ab PA |
2557 | |
2558 | - If we are performing an in-line step-over-breakpoint, then we | |
2559 | will remove a breakpoint from the target and only run the | |
2560 | current thread. We don't want any new thread (spawned by the | |
d8d96409 PA |
2561 | step) to start running, as it might miss the breakpoint. We |
2562 | need to clear the step-over state if the stepped thread exits, | |
2563 | so we also enable thread-exit events. | |
65c459ab PA |
2564 | |
2565 | - If we are stepping over a breakpoint out of line (displaced | |
2566 | stepping) then we won't remove a breakpoint from the target, | |
2567 | but, if the step spawns a new clone thread, then we will need | |
2568 | to fixup the $pc address in the clone child too, so we need it | |
d8d96409 PA |
2569 | to start stopped. We need to release the displaced stepping |
2570 | buffer if the stepped thread exits, so we also enable | |
2571 | thread-exit events. | |
7ac958f2 PA |
2572 | |
2573 | - If scheduler-locking applies, threads that the current thread | |
2574 | spawns should remain halted. It's not strictly necessary to | |
2575 | enable thread-exit events in this case, but it doesn't hurt. | |
65c459ab PA |
2576 | */ |
2577 | if (step_over_info_valid_p () | |
7ac958f2 PA |
2578 | || displaced_step_in_progress_thread (tp) |
2579 | || schedlock_applies (tp)) | |
65c459ab | 2580 | { |
d8d96409 PA |
2581 | gdb_thread_options options |
2582 | = GDB_THREAD_OPTION_CLONE | GDB_THREAD_OPTION_EXIT; | |
65c459ab PA |
2583 | if (target_supports_set_thread_options (options)) |
2584 | tp->set_thread_options (options); | |
2585 | else | |
2586 | target_thread_events (true); | |
2587 | } | |
9488c327 PA |
2588 | else if (tp->thread_fsm () != nullptr) |
2589 | { | |
2590 | gdb_thread_options options = GDB_THREAD_OPTION_EXIT; | |
2591 | if (target_supports_set_thread_options (options)) | |
2592 | tp->set_thread_options (options); | |
2593 | else | |
2594 | target_thread_events (true); | |
2595 | } | |
7ac958f2 PA |
2596 | else |
2597 | { | |
2598 | if (target_supports_set_thread_options (0)) | |
2599 | tp->set_thread_options (0); | |
9488c327 PA |
2600 | else |
2601 | { | |
2602 | process_stratum_target *resume_target = tp->inf->process_target (); | |
2603 | if (!any_thread_needs_target_thread_events (resume_target, | |
2604 | resume_ptid)) | |
2605 | target_thread_events (false); | |
2606 | } | |
7ac958f2 | 2607 | } |
65c459ab PA |
2608 | |
2609 | /* If we're resuming more than one thread simultaneously, then any | |
2610 | thread other than the leader is being set to run free. Clear any | |
2611 | previous thread option for those threads. */ | |
2612 | if (resume_ptid != inferior_ptid && target_supports_set_thread_options (0)) | |
2613 | { | |
2614 | process_stratum_target *resume_target = tp->inf->process_target (); | |
2615 | for (thread_info *thr_iter : all_non_exited_threads (resume_target, | |
2616 | resume_ptid)) | |
2617 | if (thr_iter != tp) | |
2618 | thr_iter->set_thread_options (0); | |
2619 | } | |
2620 | ||
05d65a7a SM |
2621 | infrun_debug_printf ("resume_ptid=%s, step=%d, sig=%s", |
2622 | resume_ptid.to_string ().c_str (), | |
2623 | step, gdb_signal_to_symbol_string (sig)); | |
2624 | ||
64ce06e4 PA |
2625 | target_resume (resume_ptid, step, sig); |
2626 | } | |
2627 | ||
d930703d | 2628 | /* Resume the inferior. SIG is the signal to give the inferior |
71d378ae PA |
2629 | (GDB_SIGNAL_0 for none). Note: don't call this directly; instead |
2630 | call 'resume', which handles exceptions. */ | |
c906108c | 2631 | |
71d378ae PA |
2632 | static void |
2633 | resume_1 (enum gdb_signal sig) | |
c906108c | 2634 | { |
4e1c45ea | 2635 | struct thread_info *tp = inferior_thread (); |
9c742269 SM |
2636 | regcache *regcache = get_thread_regcache (tp); |
2637 | struct gdbarch *gdbarch = regcache->arch (); | |
b0f16a3e | 2638 | ptid_t resume_ptid; |
856e7dd6 PA |
2639 | /* This represents the user's step vs continue request. When |
2640 | deciding whether "set scheduler-locking step" applies, it's the | |
2641 | user's intention that counts. */ | |
2642 | const int user_step = tp->control.stepping_command; | |
64ce06e4 PA |
2643 | /* This represents what we'll actually request the target to do. |
2644 | This can decay from a step to a continue, if e.g., we need to | |
2645 | implement single-stepping with breakpoints (software | |
2646 | single-step). */ | |
c4464ade | 2647 | bool step; |
c7e8a53c | 2648 | |
c65d6b55 | 2649 | gdb_assert (!tp->stop_requested); |
c2829269 PA |
2650 | gdb_assert (!thread_is_in_step_over_chain (tp)); |
2651 | ||
1edb66d8 | 2652 | if (tp->has_pending_waitstatus ()) |
372316f1 | 2653 | { |
1eb8556f SM |
2654 | infrun_debug_printf |
2655 | ("thread %s has pending wait " | |
2656 | "status %s (currently_stepping=%d).", | |
0fab7955 | 2657 | tp->ptid.to_string ().c_str (), |
7dca2ea7 | 2658 | tp->pending_waitstatus ().to_string ().c_str (), |
1eb8556f | 2659 | currently_stepping (tp)); |
372316f1 | 2660 | |
5b6d1e4f | 2661 | tp->inf->process_target ()->threads_executing = true; |
7846f3aa | 2662 | tp->set_resumed (true); |
372316f1 PA |
2663 | |
2664 | /* FIXME: What should we do if we are supposed to resume this | |
2665 | thread with a signal? Maybe we should maintain a queue of | |
2666 | pending signals to deliver. */ | |
2667 | if (sig != GDB_SIGNAL_0) | |
2668 | { | |
fd7dcb94 | 2669 | warning (_("Couldn't deliver signal %s to %s."), |
a068643d | 2670 | gdb_signal_to_name (sig), |
0fab7955 | 2671 | tp->ptid.to_string ().c_str ()); |
372316f1 PA |
2672 | } |
2673 | ||
1edb66d8 | 2674 | tp->set_stop_signal (GDB_SIGNAL_0); |
372316f1 PA |
2675 | |
2676 | if (target_can_async_p ()) | |
9516f85a | 2677 | { |
4a570176 | 2678 | target_async (true); |
9516f85a AB |
2679 | /* Tell the event loop we have an event to process. */ |
2680 | mark_async_event_handler (infrun_async_inferior_event_token); | |
2681 | } | |
372316f1 PA |
2682 | return; |
2683 | } | |
2684 | ||
2685 | tp->stepped_breakpoint = 0; | |
2686 | ||
6b403daa PA |
2687 | /* Depends on stepped_breakpoint. */ |
2688 | step = currently_stepping (tp); | |
2689 | ||
6f5d514f | 2690 | if (current_inferior ()->thread_waiting_for_vfork_done != nullptr) |
74609e71 | 2691 | { |
48f9886d PA |
2692 | /* Don't try to single-step a vfork parent that is waiting for |
2693 | the child to get out of the shared memory region (by exec'ing | |
2694 | or exiting). This is particularly important on software | |
2695 | single-step archs, as the child process would trip on the | |
2696 | software single step breakpoint inserted for the parent | |
2697 | process. Since the parent will not actually execute any | |
2698 | instruction until the child is out of the shared region (such | |
2699 | are vfork's semantics), it is safe to simply continue it. | |
2700 | Eventually, we'll see a TARGET_WAITKIND_VFORK_DONE event for | |
2701 | the parent, and tell it to `keep_going', which automatically | |
2702 | re-sets it stepping. */ | |
1eb8556f | 2703 | infrun_debug_printf ("resume : clear step"); |
c4464ade | 2704 | step = false; |
74609e71 YQ |
2705 | } |
2706 | ||
7ca9b62a TBA |
2707 | CORE_ADDR pc = regcache_read_pc (regcache); |
2708 | ||
1eb8556f SM |
2709 | infrun_debug_printf ("step=%d, signal=%s, trap_expected=%d, " |
2710 | "current thread [%s] at %s", | |
2711 | step, gdb_signal_to_symbol_string (sig), | |
2712 | tp->control.trap_expected, | |
0fab7955 | 2713 | inferior_ptid.to_string ().c_str (), |
1eb8556f | 2714 | paddress (gdbarch, pc)); |
c906108c | 2715 | |
f9582a22 | 2716 | const address_space *aspace = tp->inf->aspace.get (); |
74387712 | 2717 | |
c2c6d25f JM |
2718 | /* Normally, by the time we reach `resume', the breakpoints are either |
2719 | removed or inserted, as appropriate. The exception is if we're sitting | |
2720 | at a permanent breakpoint; we need to step over it, but permanent | |
2721 | breakpoints can't be removed. So we have to test for it here. */ | |
6c95b8df | 2722 | if (breakpoint_here_p (aspace, pc) == permanent_breakpoint_here) |
6d350bb5 | 2723 | { |
af48d08f PA |
2724 | if (sig != GDB_SIGNAL_0) |
2725 | { | |
2726 | /* We have a signal to pass to the inferior. The resume | |
2727 | may, or may not take us to the signal handler. If this | |
2728 | is a step, we'll need to stop in the signal handler, if | |
2729 | there's one, (if the target supports stepping into | |
2730 | handlers), or in the next mainline instruction, if | |
2731 | there's no handler. If this is a continue, we need to be | |
2732 | sure to run the handler with all breakpoints inserted. | |
2733 | In all cases, set a breakpoint at the current address | |
2734 | (where the handler returns to), and once that breakpoint | |
2735 | is hit, resume skipping the permanent breakpoint. If | |
2736 | that breakpoint isn't hit, then we've stepped into the | |
2737 | signal handler (or hit some other event). We'll delete | |
2738 | the step-resume breakpoint then. */ | |
2739 | ||
1eb8556f SM |
2740 | infrun_debug_printf ("resume: skipping permanent breakpoint, " |
2741 | "deliver signal first"); | |
af48d08f PA |
2742 | |
2743 | clear_step_over_info (); | |
2744 | tp->control.trap_expected = 0; | |
2745 | ||
03acd4d8 | 2746 | if (tp->control.step_resume_breakpoint == nullptr) |
af48d08f PA |
2747 | { |
2748 | /* Set a "high-priority" step-resume, as we don't want | |
2749 | user breakpoints at PC to trigger (again) when this | |
2750 | hits. */ | |
2751 | insert_hp_step_resume_breakpoint_at_frame (get_current_frame ()); | |
f5951b9f SM |
2752 | gdb_assert (tp->control.step_resume_breakpoint->first_loc () |
2753 | .permanent); | |
af48d08f PA |
2754 | |
2755 | tp->step_after_step_resume_breakpoint = step; | |
2756 | } | |
2757 | ||
2758 | insert_breakpoints (); | |
2759 | } | |
2760 | else | |
2761 | { | |
2762 | /* There's no signal to pass, we can go ahead and skip the | |
2763 | permanent breakpoint manually. */ | |
1eb8556f | 2764 | infrun_debug_printf ("skipping permanent breakpoint"); |
af48d08f PA |
2765 | gdbarch_skip_permanent_breakpoint (gdbarch, regcache); |
2766 | /* Update pc to reflect the new address from which we will | |
2767 | execute instructions. */ | |
2768 | pc = regcache_read_pc (regcache); | |
2769 | ||
2770 | if (step) | |
2771 | { | |
2772 | /* We've already advanced the PC, so the stepping part | |
2773 | is done. Now we need to arrange for a trap to be | |
2774 | reported to handle_inferior_event. Set a breakpoint | |
2775 | at the current PC, and run to it. Don't update | |
2776 | prev_pc, because if we end in | |
44a1ee51 PA |
2777 | switch_back_to_stepped_thread, we want the "expected |
2778 | thread advanced also" branch to be taken. IOW, we | |
2779 | don't want this thread to step further from PC | |
af48d08f | 2780 | (overstep). */ |
1ac806b8 | 2781 | gdb_assert (!step_over_info_valid_p ()); |
af48d08f PA |
2782 | insert_single_step_breakpoint (gdbarch, aspace, pc); |
2783 | insert_breakpoints (); | |
2784 | ||
fbea99ea | 2785 | resume_ptid = internal_resume_ptid (user_step); |
c4464ade | 2786 | do_target_resume (resume_ptid, false, GDB_SIGNAL_0); |
7846f3aa | 2787 | tp->set_resumed (true); |
af48d08f PA |
2788 | return; |
2789 | } | |
2790 | } | |
6d350bb5 | 2791 | } |
c2c6d25f | 2792 | |
c1e36e3e PA |
2793 | /* If we have a breakpoint to step over, make sure to do a single |
2794 | step only. Same if we have software watchpoints. */ | |
2795 | if (tp->control.trap_expected || bpstat_should_step ()) | |
2796 | tp->control.may_range_step = 0; | |
2797 | ||
7da6a5b9 LM |
2798 | /* If displaced stepping is enabled, step over breakpoints by executing a |
2799 | copy of the instruction at a different address. | |
237fc4c9 PA |
2800 | |
2801 | We can't use displaced stepping when we have a signal to deliver; | |
2802 | the comments for displaced_step_prepare explain why. The | |
2803 | comments in the handle_inferior event for dealing with 'random | |
74609e71 YQ |
2804 | signals' explain what we do instead. |
2805 | ||
2806 | We can't use displaced stepping when we are waiting for vfork_done | |
2807 | event, displaced stepping breaks the vfork child similarly as single | |
2808 | step software breakpoint. */ | |
3fc8eb30 PA |
2809 | if (tp->control.trap_expected |
2810 | && use_displaced_stepping (tp) | |
cb71640d | 2811 | && !step_over_info_valid_p () |
a493e3e2 | 2812 | && sig == GDB_SIGNAL_0 |
6f5d514f | 2813 | && current_inferior ()->thread_waiting_for_vfork_done == nullptr) |
237fc4c9 | 2814 | { |
bab37966 SM |
2815 | displaced_step_prepare_status prepare_status |
2816 | = displaced_step_prepare (tp); | |
fc1cf338 | 2817 | |
bab37966 | 2818 | if (prepare_status == DISPLACED_STEP_PREPARE_STATUS_UNAVAILABLE) |
d56b7306 | 2819 | { |
1eb8556f | 2820 | infrun_debug_printf ("Got placed in step-over queue"); |
4d9d9d04 PA |
2821 | |
2822 | tp->control.trap_expected = 0; | |
d56b7306 VP |
2823 | return; |
2824 | } | |
bab37966 | 2825 | else if (prepare_status == DISPLACED_STEP_PREPARE_STATUS_CANT) |
3fc8eb30 PA |
2826 | { |
2827 | /* Fallback to stepping over the breakpoint in-line. */ | |
2828 | ||
2829 | if (target_is_non_stop_p ()) | |
4f5539f0 | 2830 | stop_all_threads ("displaced stepping falling back on inline stepping"); |
3fc8eb30 | 2831 | |
74387712 SM |
2832 | set_step_over_info (aspace, regcache_read_pc (regcache), 0, |
2833 | tp->global_num); | |
3fc8eb30 | 2834 | |
22b11ba9 | 2835 | step = maybe_software_singlestep (gdbarch); |
3fc8eb30 PA |
2836 | |
2837 | insert_breakpoints (); | |
2838 | } | |
bab37966 | 2839 | else if (prepare_status == DISPLACED_STEP_PREPARE_STATUS_OK) |
3fc8eb30 | 2840 | { |
3fc8eb30 PA |
2841 | /* Update pc to reflect the new address from which we will |
2842 | execute instructions due to displaced stepping. */ | |
00431a78 | 2843 | pc = regcache_read_pc (get_thread_regcache (tp)); |
ca7781d2 | 2844 | |
40a53766 | 2845 | step = gdbarch_displaced_step_hw_singlestep (gdbarch); |
3fc8eb30 | 2846 | } |
bab37966 | 2847 | else |
557b4d76 SM |
2848 | gdb_assert_not_reached ("Invalid displaced_step_prepare_status " |
2849 | "value."); | |
237fc4c9 PA |
2850 | } |
2851 | ||
2facfe5c | 2852 | /* Do we need to do it the hard way, w/temp breakpoints? */ |
99e40580 | 2853 | else if (step) |
22b11ba9 | 2854 | step = maybe_software_singlestep (gdbarch); |
c906108c | 2855 | |
30852783 UW |
2856 | /* Currently, our software single-step implementation leads to different |
2857 | results than hardware single-stepping in one situation: when stepping | |
2858 | into delivering a signal which has an associated signal handler, | |
2859 | hardware single-step will stop at the first instruction of the handler, | |
2860 | while software single-step will simply skip execution of the handler. | |
2861 | ||
2862 | For now, this difference in behavior is accepted since there is no | |
2863 | easy way to actually implement single-stepping into a signal handler | |
2864 | without kernel support. | |
2865 | ||
2866 | However, there is one scenario where this difference leads to follow-on | |
2867 | problems: if we're stepping off a breakpoint by removing all breakpoints | |
2868 | and then single-stepping. In this case, the software single-step | |
2869 | behavior means that even if there is a *breakpoint* in the signal | |
2870 | handler, GDB still would not stop. | |
2871 | ||
2872 | Fortunately, we can at least fix this particular issue. We detect | |
2873 | here the case where we are about to deliver a signal while software | |
2874 | single-stepping with breakpoints removed. In this situation, we | |
2875 | revert the decisions to remove all breakpoints and insert single- | |
2876 | step breakpoints, and instead we install a step-resume breakpoint | |
2877 | at the current address, deliver the signal without stepping, and | |
2878 | once we arrive back at the step-resume breakpoint, actually step | |
2879 | over the breakpoint we originally wanted to step over. */ | |
34b7e8a6 | 2880 | if (thread_has_single_step_breakpoints_set (tp) |
6cc83d2a PA |
2881 | && sig != GDB_SIGNAL_0 |
2882 | && step_over_info_valid_p ()) | |
30852783 UW |
2883 | { |
2884 | /* If we have nested signals or a pending signal is delivered | |
7da6a5b9 | 2885 | immediately after a handler returns, might already have |
30852783 UW |
2886 | a step-resume breakpoint set on the earlier handler. We cannot |
2887 | set another step-resume breakpoint; just continue on until the | |
2888 | original breakpoint is hit. */ | |
03acd4d8 | 2889 | if (tp->control.step_resume_breakpoint == nullptr) |
30852783 | 2890 | { |
2c03e5be | 2891 | insert_hp_step_resume_breakpoint_at_frame (get_current_frame ()); |
30852783 UW |
2892 | tp->step_after_step_resume_breakpoint = 1; |
2893 | } | |
2894 | ||
34b7e8a6 | 2895 | delete_single_step_breakpoints (tp); |
30852783 | 2896 | |
31e77af2 | 2897 | clear_step_over_info (); |
30852783 | 2898 | tp->control.trap_expected = 0; |
31e77af2 PA |
2899 | |
2900 | insert_breakpoints (); | |
30852783 UW |
2901 | } |
2902 | ||
b0f16a3e SM |
2903 | /* If STEP is set, it's a request to use hardware stepping |
2904 | facilities. But in that case, we should never | |
2905 | use singlestep breakpoint. */ | |
34b7e8a6 | 2906 | gdb_assert (!(thread_has_single_step_breakpoints_set (tp) && step)); |
dfcd3bfb | 2907 | |
fbea99ea | 2908 | /* Decide the set of threads to ask the target to resume. */ |
1946c4cc | 2909 | if (tp->control.trap_expected) |
b0f16a3e SM |
2910 | { |
2911 | /* We're allowing a thread to run past a breakpoint it has | |
1946c4cc YQ |
2912 | hit, either by single-stepping the thread with the breakpoint |
2913 | removed, or by displaced stepping, with the breakpoint inserted. | |
2914 | In the former case, we need to single-step only this thread, | |
2915 | and keep others stopped, as they can miss this breakpoint if | |
2916 | allowed to run. That's not really a problem for displaced | |
2917 | stepping, but, we still keep other threads stopped, in case | |
2918 | another thread is also stopped for a breakpoint waiting for | |
2919 | its turn in the displaced stepping queue. */ | |
b0f16a3e SM |
2920 | resume_ptid = inferior_ptid; |
2921 | } | |
fbea99ea PA |
2922 | else |
2923 | resume_ptid = internal_resume_ptid (user_step); | |
d4db2f36 | 2924 | |
7f5ef605 PA |
2925 | if (execution_direction != EXEC_REVERSE |
2926 | && step && breakpoint_inserted_here_p (aspace, pc)) | |
b0f16a3e | 2927 | { |
372316f1 PA |
2928 | /* There are two cases where we currently need to step a |
2929 | breakpoint instruction when we have a signal to deliver: | |
2930 | ||
2931 | - See handle_signal_stop where we handle random signals that | |
2932 | could take out us out of the stepping range. Normally, in | |
2933 | that case we end up continuing (instead of stepping) over the | |
7f5ef605 PA |
2934 | signal handler with a breakpoint at PC, but there are cases |
2935 | where we should _always_ single-step, even if we have a | |
2936 | step-resume breakpoint, like when a software watchpoint is | |
2937 | set. Assuming single-stepping and delivering a signal at the | |
2938 | same time would takes us to the signal handler, then we could | |
2939 | have removed the breakpoint at PC to step over it. However, | |
2940 | some hardware step targets (like e.g., Mac OS) can't step | |
2941 | into signal handlers, and for those, we need to leave the | |
2942 | breakpoint at PC inserted, as otherwise if the handler | |
2943 | recurses and executes PC again, it'll miss the breakpoint. | |
2944 | So we leave the breakpoint inserted anyway, but we need to | |
2945 | record that we tried to step a breakpoint instruction, so | |
372316f1 PA |
2946 | that adjust_pc_after_break doesn't end up confused. |
2947 | ||
dda83cd7 | 2948 | - In non-stop if we insert a breakpoint (e.g., a step-resume) |
372316f1 PA |
2949 | in one thread after another thread that was stepping had been |
2950 | momentarily paused for a step-over. When we re-resume the | |
2951 | stepping thread, it may be resumed from that address with a | |
2952 | breakpoint that hasn't trapped yet. Seen with | |
2953 | gdb.threads/non-stop-fair-events.exp, on targets that don't | |
2954 | do displaced stepping. */ | |
2955 | ||
1eb8556f | 2956 | infrun_debug_printf ("resume: [%s] stepped breakpoint", |
0fab7955 | 2957 | tp->ptid.to_string ().c_str ()); |
7f5ef605 PA |
2958 | |
2959 | tp->stepped_breakpoint = 1; | |
2960 | ||
b0f16a3e SM |
2961 | /* Most targets can step a breakpoint instruction, thus |
2962 | executing it normally. But if this one cannot, just | |
2963 | continue and we will hit it anyway. */ | |
7f5ef605 | 2964 | if (gdbarch_cannot_step_breakpoint (gdbarch)) |
c4464ade | 2965 | step = false; |
b0f16a3e | 2966 | } |
ef5cf84e | 2967 | |
b0f16a3e SM |
2968 | if (tp->control.may_range_step) |
2969 | { | |
2970 | /* If we're resuming a thread with the PC out of the step | |
2971 | range, then we're doing some nested/finer run control | |
2972 | operation, like stepping the thread out of the dynamic | |
2973 | linker or the displaced stepping scratch pad. We | |
2974 | shouldn't have allowed a range step then. */ | |
2975 | gdb_assert (pc_in_thread_step_range (pc, tp)); | |
2976 | } | |
c1e36e3e | 2977 | |
64ce06e4 | 2978 | do_target_resume (resume_ptid, step, sig); |
7846f3aa | 2979 | tp->set_resumed (true); |
c906108c | 2980 | } |
71d378ae PA |
2981 | |
2982 | /* Resume the inferior. SIG is the signal to give the inferior | |
2983 | (GDB_SIGNAL_0 for none). This is a wrapper around 'resume_1' that | |
2984 | rolls back state on error. */ | |
2985 | ||
aff4e175 | 2986 | static void |
71d378ae PA |
2987 | resume (gdb_signal sig) |
2988 | { | |
a70b8144 | 2989 | try |
71d378ae PA |
2990 | { |
2991 | resume_1 (sig); | |
2992 | } | |
230d2906 | 2993 | catch (const gdb_exception &ex) |
71d378ae PA |
2994 | { |
2995 | /* If resuming is being aborted for any reason, delete any | |
2996 | single-step breakpoint resume_1 may have created, to avoid | |
2997 | confusing the following resumption, and to avoid leaving | |
2998 | single-step breakpoints perturbing other threads, in case | |
2999 | we're running in non-stop mode. */ | |
3000 | if (inferior_ptid != null_ptid) | |
3001 | delete_single_step_breakpoints (inferior_thread ()); | |
eedc3f4f | 3002 | throw; |
71d378ae | 3003 | } |
71d378ae PA |
3004 | } |
3005 | ||
c906108c | 3006 | \f |
237fc4c9 | 3007 | /* Proceeding. */ |
c906108c | 3008 | |
4c2f2a79 PA |
3009 | /* See infrun.h. */ |
3010 | ||
3011 | /* Counter that tracks number of user visible stops. This can be used | |
3012 | to tell whether a command has proceeded the inferior past the | |
3013 | current location. This allows e.g., inferior function calls in | |
3014 | breakpoint commands to not interrupt the command list. When the | |
3015 | call finishes successfully, the inferior is standing at the same | |
3016 | breakpoint as if nothing happened (and so we don't call | |
3017 | normal_stop). */ | |
3018 | static ULONGEST current_stop_id; | |
3019 | ||
3020 | /* See infrun.h. */ | |
3021 | ||
3022 | ULONGEST | |
3023 | get_stop_id (void) | |
3024 | { | |
3025 | return current_stop_id; | |
3026 | } | |
3027 | ||
3028 | /* Called when we report a user visible stop. */ | |
3029 | ||
3030 | static void | |
3031 | new_stop_id (void) | |
3032 | { | |
3033 | current_stop_id++; | |
3034 | } | |
3035 | ||
c906108c SS |
3036 | /* Clear out all variables saying what to do when inferior is continued. |
3037 | First do this, then set the ones you want, then call `proceed'. */ | |
3038 | ||
a7212384 UW |
3039 | static void |
3040 | clear_proceed_status_thread (struct thread_info *tp) | |
c906108c | 3041 | { |
0fab7955 | 3042 | infrun_debug_printf ("%s", tp->ptid.to_string ().c_str ()); |
d6b48e9c | 3043 | |
372316f1 PA |
3044 | /* If we're starting a new sequence, then the previous finished |
3045 | single-step is no longer relevant. */ | |
1edb66d8 | 3046 | if (tp->has_pending_waitstatus ()) |
372316f1 | 3047 | { |
1edb66d8 | 3048 | if (tp->stop_reason () == TARGET_STOPPED_BY_SINGLE_STEP) |
372316f1 | 3049 | { |
1eb8556f SM |
3050 | infrun_debug_printf ("pending event of %s was a finished step. " |
3051 | "Discarding.", | |
0fab7955 | 3052 | tp->ptid.to_string ().c_str ()); |
372316f1 | 3053 | |
1edb66d8 SM |
3054 | tp->clear_pending_waitstatus (); |
3055 | tp->set_stop_reason (TARGET_STOPPED_BY_NO_REASON); | |
372316f1 | 3056 | } |
1eb8556f | 3057 | else |
372316f1 | 3058 | { |
1eb8556f SM |
3059 | infrun_debug_printf |
3060 | ("thread %s has pending wait status %s (currently_stepping=%d).", | |
0fab7955 | 3061 | tp->ptid.to_string ().c_str (), |
7dca2ea7 | 3062 | tp->pending_waitstatus ().to_string ().c_str (), |
1eb8556f | 3063 | currently_stepping (tp)); |
372316f1 PA |
3064 | } |
3065 | } | |
3066 | ||
70509625 PA |
3067 | /* If this signal should not be seen by program, give it zero. |
3068 | Used for debugging signals. */ | |
1edb66d8 SM |
3069 | if (!signal_pass_state (tp->stop_signal ())) |
3070 | tp->set_stop_signal (GDB_SIGNAL_0); | |
70509625 | 3071 | |
573269a8 | 3072 | tp->release_thread_fsm (); |
243a9253 | 3073 | |
16c381f0 JK |
3074 | tp->control.trap_expected = 0; |
3075 | tp->control.step_range_start = 0; | |
3076 | tp->control.step_range_end = 0; | |
c1e36e3e | 3077 | tp->control.may_range_step = 0; |
16c381f0 JK |
3078 | tp->control.step_frame_id = null_frame_id; |
3079 | tp->control.step_stack_frame_id = null_frame_id; | |
3080 | tp->control.step_over_calls = STEP_OVER_UNDEBUGGABLE; | |
03acd4d8 | 3081 | tp->control.step_start_function = nullptr; |
a7212384 | 3082 | tp->stop_requested = 0; |
4e1c45ea | 3083 | |
16c381f0 | 3084 | tp->control.stop_step = 0; |
32400beb | 3085 | |
b986eec5 CL |
3086 | tp->control.proceed_to_finish = 0; |
3087 | ||
856e7dd6 | 3088 | tp->control.stepping_command = 0; |
17b2616c | 3089 | |
a7212384 | 3090 | /* Discard any remaining commands or status from previous stop. */ |
16c381f0 | 3091 | bpstat_clear (&tp->control.stop_bpstat); |
a7212384 | 3092 | } |
32400beb | 3093 | |
7603ea6a SM |
3094 | /* Notify the current interpreter and observers that the target is about to |
3095 | proceed. */ | |
3096 | ||
3097 | static void | |
3098 | notify_about_to_proceed () | |
3099 | { | |
3100 | top_level_interpreter ()->on_about_to_proceed (); | |
3101 | gdb::observers::about_to_proceed.notify (); | |
3102 | } | |
3103 | ||
a7212384 | 3104 | void |
70509625 | 3105 | clear_proceed_status (int step) |
a7212384 | 3106 | { |
f2665db5 MM |
3107 | /* With scheduler-locking replay, stop replaying other threads if we're |
3108 | not replaying the user-visible resume ptid. | |
3109 | ||
3110 | This is a convenience feature to not require the user to explicitly | |
3111 | stop replaying the other threads. We're assuming that the user's | |
3112 | intent is to resume tracing the recorded process. */ | |
3113 | if (!non_stop && scheduler_mode == schedlock_replay | |
3114 | && target_record_is_replaying (minus_one_ptid) | |
3115 | && !target_record_will_replay (user_visible_resume_ptid (step), | |
3116 | execution_direction)) | |
3117 | target_record_stop_replaying (); | |
3118 | ||
08036331 | 3119 | if (!non_stop && inferior_ptid != null_ptid) |
6c95b8df | 3120 | { |
08036331 | 3121 | ptid_t resume_ptid = user_visible_resume_ptid (step); |
5b6d1e4f PA |
3122 | process_stratum_target *resume_target |
3123 | = user_visible_resume_target (resume_ptid); | |
70509625 PA |
3124 | |
3125 | /* In all-stop mode, delete the per-thread status of all threads | |
3126 | we're about to resume, implicitly and explicitly. */ | |
5b6d1e4f | 3127 | for (thread_info *tp : all_non_exited_threads (resume_target, resume_ptid)) |
08036331 | 3128 | clear_proceed_status_thread (tp); |
6c95b8df PA |
3129 | } |
3130 | ||
d7e15655 | 3131 | if (inferior_ptid != null_ptid) |
a7212384 UW |
3132 | { |
3133 | struct inferior *inferior; | |
3134 | ||
3135 | if (non_stop) | |
3136 | { | |
6c95b8df PA |
3137 | /* If in non-stop mode, only delete the per-thread status of |
3138 | the current thread. */ | |
a7212384 UW |
3139 | clear_proceed_status_thread (inferior_thread ()); |
3140 | } | |
6c95b8df | 3141 | |
d6b48e9c | 3142 | inferior = current_inferior (); |
16c381f0 | 3143 | inferior->control.stop_soon = NO_STOP_QUIETLY; |
4e1c45ea PA |
3144 | } |
3145 | ||
7603ea6a | 3146 | notify_about_to_proceed (); |
c906108c SS |
3147 | } |
3148 | ||
99619bea PA |
3149 | /* Returns true if TP is still stopped at a breakpoint that needs |
3150 | stepping-over in order to make progress. If the breakpoint is gone | |
3151 | meanwhile, we can skip the whole step-over dance. */ | |
ea67f13b | 3152 | |
c4464ade | 3153 | static bool |
6c4cfb24 | 3154 | thread_still_needs_step_over_bp (struct thread_info *tp) |
99619bea PA |
3155 | { |
3156 | if (tp->stepping_over_breakpoint) | |
3157 | { | |
00431a78 | 3158 | struct regcache *regcache = get_thread_regcache (tp); |
99619bea | 3159 | |
f9582a22 | 3160 | if (breakpoint_here_p (tp->inf->aspace.get (), |
af48d08f PA |
3161 | regcache_read_pc (regcache)) |
3162 | == ordinary_breakpoint_here) | |
c4464ade | 3163 | return true; |
99619bea PA |
3164 | |
3165 | tp->stepping_over_breakpoint = 0; | |
3166 | } | |
3167 | ||
c4464ade | 3168 | return false; |
99619bea PA |
3169 | } |
3170 | ||
6c4cfb24 PA |
3171 | /* Check whether thread TP still needs to start a step-over in order |
3172 | to make progress when resumed. Returns an bitwise or of enum | |
3173 | step_over_what bits, indicating what needs to be stepped over. */ | |
3174 | ||
8d297bbf | 3175 | static step_over_what |
6c4cfb24 PA |
3176 | thread_still_needs_step_over (struct thread_info *tp) |
3177 | { | |
8d297bbf | 3178 | step_over_what what = 0; |
6c4cfb24 PA |
3179 | |
3180 | if (thread_still_needs_step_over_bp (tp)) | |
3181 | what |= STEP_OVER_BREAKPOINT; | |
3182 | ||
3183 | if (tp->stepping_over_watchpoint | |
9aed480c | 3184 | && !target_have_steppable_watchpoint ()) |
6c4cfb24 PA |
3185 | what |= STEP_OVER_WATCHPOINT; |
3186 | ||
3187 | return what; | |
3188 | } | |
3189 | ||
483805cf PA |
3190 | /* Returns true if scheduler locking applies. STEP indicates whether |
3191 | we're about to do a step/next-like command to a thread. */ | |
3192 | ||
c4464ade | 3193 | static bool |
856e7dd6 | 3194 | schedlock_applies (struct thread_info *tp) |
483805cf PA |
3195 | { |
3196 | return (scheduler_mode == schedlock_on | |
3197 | || (scheduler_mode == schedlock_step | |
f2665db5 MM |
3198 | && tp->control.stepping_command) |
3199 | || (scheduler_mode == schedlock_replay | |
3200 | && target_record_will_replay (minus_one_ptid, | |
3201 | execution_direction))); | |
483805cf PA |
3202 | } |
3203 | ||
1192f124 SM |
3204 | /* Set process_stratum_target::COMMIT_RESUMED_STATE in all target |
3205 | stacks that have threads executing and don't have threads with | |
3206 | pending events. */ | |
5b6d1e4f PA |
3207 | |
3208 | static void | |
1192f124 SM |
3209 | maybe_set_commit_resumed_all_targets () |
3210 | { | |
b4b1a226 SM |
3211 | scoped_restore_current_thread restore_thread; |
3212 | ||
1192f124 SM |
3213 | for (inferior *inf : all_non_exited_inferiors ()) |
3214 | { | |
3215 | process_stratum_target *proc_target = inf->process_target (); | |
3216 | ||
3217 | if (proc_target->commit_resumed_state) | |
3218 | { | |
3219 | /* We already set this in a previous iteration, via another | |
3220 | inferior sharing the process_stratum target. */ | |
3221 | continue; | |
3222 | } | |
3223 | ||
3224 | /* If the target has no resumed threads, it would be useless to | |
3225 | ask it to commit the resumed threads. */ | |
3226 | if (!proc_target->threads_executing) | |
3227 | { | |
3228 | infrun_debug_printf ("not requesting commit-resumed for target " | |
3229 | "%s, no resumed threads", | |
3230 | proc_target->shortname ()); | |
3231 | continue; | |
3232 | } | |
3233 | ||
3234 | /* As an optimization, if a thread from this target has some | |
3235 | status to report, handle it before requiring the target to | |
3236 | commit its resumed threads: handling the status might lead to | |
3237 | resuming more threads. */ | |
273dadf2 | 3238 | if (proc_target->has_resumed_with_pending_wait_status ()) |
1192f124 SM |
3239 | { |
3240 | infrun_debug_printf ("not requesting commit-resumed for target %s, a" | |
3241 | " thread has a pending waitstatus", | |
3242 | proc_target->shortname ()); | |
3243 | continue; | |
3244 | } | |
3245 | ||
b4b1a226 SM |
3246 | switch_to_inferior_no_thread (inf); |
3247 | ||
3248 | if (target_has_pending_events ()) | |
3249 | { | |
3250 | infrun_debug_printf ("not requesting commit-resumed for target %s, " | |
3251 | "target has pending events", | |
3252 | proc_target->shortname ()); | |
3253 | continue; | |
3254 | } | |
3255 | ||
1192f124 SM |
3256 | infrun_debug_printf ("enabling commit-resumed for target %s", |
3257 | proc_target->shortname ()); | |
3258 | ||
3259 | proc_target->commit_resumed_state = true; | |
3260 | } | |
3261 | } | |
3262 | ||
3263 | /* See infrun.h. */ | |
3264 | ||
3265 | void | |
3266 | maybe_call_commit_resumed_all_targets () | |
5b6d1e4f PA |
3267 | { |
3268 | scoped_restore_current_thread restore_thread; | |
3269 | ||
1192f124 SM |
3270 | for (inferior *inf : all_non_exited_inferiors ()) |
3271 | { | |
3272 | process_stratum_target *proc_target = inf->process_target (); | |
3273 | ||
3274 | if (!proc_target->commit_resumed_state) | |
3275 | continue; | |
3276 | ||
3277 | switch_to_inferior_no_thread (inf); | |
3278 | ||
3279 | infrun_debug_printf ("calling commit_resumed for target %s", | |
3280 | proc_target->shortname()); | |
3281 | ||
3282 | target_commit_resumed (); | |
3283 | } | |
3284 | } | |
3285 | ||
3286 | /* To track nesting of scoped_disable_commit_resumed objects, ensuring | |
3287 | that only the outermost one attempts to re-enable | |
3288 | commit-resumed. */ | |
3289 | static bool enable_commit_resumed = true; | |
3290 | ||
3291 | /* See infrun.h. */ | |
3292 | ||
3293 | scoped_disable_commit_resumed::scoped_disable_commit_resumed | |
3294 | (const char *reason) | |
3295 | : m_reason (reason), | |
3296 | m_prev_enable_commit_resumed (enable_commit_resumed) | |
3297 | { | |
3298 | infrun_debug_printf ("reason=%s", m_reason); | |
3299 | ||
3300 | enable_commit_resumed = false; | |
5b6d1e4f PA |
3301 | |
3302 | for (inferior *inf : all_non_exited_inferiors ()) | |
1192f124 SM |
3303 | { |
3304 | process_stratum_target *proc_target = inf->process_target (); | |
5b6d1e4f | 3305 | |
1192f124 SM |
3306 | if (m_prev_enable_commit_resumed) |
3307 | { | |
3308 | /* This is the outermost instance: force all | |
3309 | COMMIT_RESUMED_STATE to false. */ | |
3310 | proc_target->commit_resumed_state = false; | |
3311 | } | |
3312 | else | |
3313 | { | |
3314 | /* This is not the outermost instance, we expect | |
3315 | COMMIT_RESUMED_STATE to have been cleared by the | |
3316 | outermost instance. */ | |
3317 | gdb_assert (!proc_target->commit_resumed_state); | |
3318 | } | |
3319 | } | |
3320 | } | |
3321 | ||
3322 | /* See infrun.h. */ | |
3323 | ||
3324 | void | |
3325 | scoped_disable_commit_resumed::reset () | |
3326 | { | |
3327 | if (m_reset) | |
3328 | return; | |
3329 | m_reset = true; | |
3330 | ||
3331 | infrun_debug_printf ("reason=%s", m_reason); | |
3332 | ||
3333 | gdb_assert (!enable_commit_resumed); | |
3334 | ||
3335 | enable_commit_resumed = m_prev_enable_commit_resumed; | |
3336 | ||
3337 | if (m_prev_enable_commit_resumed) | |
5b6d1e4f | 3338 | { |
1192f124 | 3339 | /* This is the outermost instance, re-enable |
287de656 | 3340 | COMMIT_RESUMED_STATE on the targets where it's possible. */ |
1192f124 SM |
3341 | maybe_set_commit_resumed_all_targets (); |
3342 | } | |
3343 | else | |
3344 | { | |
3345 | /* This is not the outermost instance, we expect | |
3346 | COMMIT_RESUMED_STATE to still be false. */ | |
3347 | for (inferior *inf : all_non_exited_inferiors ()) | |
3348 | { | |
3349 | process_stratum_target *proc_target = inf->process_target (); | |
3350 | gdb_assert (!proc_target->commit_resumed_state); | |
3351 | } | |
3352 | } | |
3353 | } | |
3354 | ||
3355 | /* See infrun.h. */ | |
3356 | ||
3357 | scoped_disable_commit_resumed::~scoped_disable_commit_resumed () | |
3358 | { | |
3359 | reset (); | |
3360 | } | |
3361 | ||
3362 | /* See infrun.h. */ | |
3363 | ||
3364 | void | |
3365 | scoped_disable_commit_resumed::reset_and_commit () | |
3366 | { | |
3367 | reset (); | |
3368 | maybe_call_commit_resumed_all_targets (); | |
3369 | } | |
3370 | ||
3371 | /* See infrun.h. */ | |
3372 | ||
3373 | scoped_enable_commit_resumed::scoped_enable_commit_resumed | |
3374 | (const char *reason) | |
3375 | : m_reason (reason), | |
3376 | m_prev_enable_commit_resumed (enable_commit_resumed) | |
3377 | { | |
3378 | infrun_debug_printf ("reason=%s", m_reason); | |
3379 | ||
3380 | if (!enable_commit_resumed) | |
3381 | { | |
3382 | enable_commit_resumed = true; | |
3383 | ||
3384 | /* Re-enable COMMIT_RESUMED_STATE on the targets where it's | |
3385 | possible. */ | |
3386 | maybe_set_commit_resumed_all_targets (); | |
3387 | ||
3388 | maybe_call_commit_resumed_all_targets (); | |
3389 | } | |
3390 | } | |
3391 | ||
3392 | /* See infrun.h. */ | |
3393 | ||
3394 | scoped_enable_commit_resumed::~scoped_enable_commit_resumed () | |
3395 | { | |
3396 | infrun_debug_printf ("reason=%s", m_reason); | |
3397 | ||
3398 | gdb_assert (enable_commit_resumed); | |
3399 | ||
3400 | enable_commit_resumed = m_prev_enable_commit_resumed; | |
3401 | ||
3402 | if (!enable_commit_resumed) | |
3403 | { | |
3404 | /* Force all COMMIT_RESUMED_STATE back to false. */ | |
3405 | for (inferior *inf : all_non_exited_inferiors ()) | |
3406 | { | |
3407 | process_stratum_target *proc_target = inf->process_target (); | |
3408 | proc_target->commit_resumed_state = false; | |
3409 | } | |
5b6d1e4f PA |
3410 | } |
3411 | } | |
3412 | ||
2f4fcf00 PA |
3413 | /* Check that all the targets we're about to resume are in non-stop |
3414 | mode. Ideally, we'd only care whether all targets support | |
3415 | target-async, but we're not there yet. E.g., stop_all_threads | |
3416 | doesn't know how to handle all-stop targets. Also, the remote | |
3417 | protocol in all-stop mode is synchronous, irrespective of | |
3418 | target-async, which means that things like a breakpoint re-set | |
3419 | triggered by one target would try to read memory from all targets | |
3420 | and fail. */ | |
3421 | ||
3422 | static void | |
3423 | check_multi_target_resumption (process_stratum_target *resume_target) | |
3424 | { | |
3425 | if (!non_stop && resume_target == nullptr) | |
3426 | { | |
3427 | scoped_restore_current_thread restore_thread; | |
3428 | ||
3429 | /* This is used to track whether we're resuming more than one | |
3430 | target. */ | |
3431 | process_stratum_target *first_connection = nullptr; | |
3432 | ||
3433 | /* The first inferior we see with a target that does not work in | |
3434 | always-non-stop mode. */ | |
3435 | inferior *first_not_non_stop = nullptr; | |
3436 | ||
f058c521 | 3437 | for (inferior *inf : all_non_exited_inferiors ()) |
2f4fcf00 PA |
3438 | { |
3439 | switch_to_inferior_no_thread (inf); | |
3440 | ||
55f6301a | 3441 | if (!target_has_execution ()) |
2f4fcf00 PA |
3442 | continue; |
3443 | ||
3444 | process_stratum_target *proc_target | |
3445 | = current_inferior ()->process_target(); | |
3446 | ||
3447 | if (!target_is_non_stop_p ()) | |
3448 | first_not_non_stop = inf; | |
3449 | ||
3450 | if (first_connection == nullptr) | |
3451 | first_connection = proc_target; | |
3452 | else if (first_connection != proc_target | |
3453 | && first_not_non_stop != nullptr) | |
3454 | { | |
3455 | switch_to_inferior_no_thread (first_not_non_stop); | |
3456 | ||
3457 | proc_target = current_inferior ()->process_target(); | |
3458 | ||
3459 | error (_("Connection %d (%s) does not support " | |
3460 | "multi-target resumption."), | |
3461 | proc_target->connection_number, | |
3462 | make_target_connection_string (proc_target).c_str ()); | |
3463 | } | |
3464 | } | |
3465 | } | |
3466 | } | |
3467 | ||
e07d892c MS |
3468 | /* Helper function for `proceed`. Check if thread TP is suitable for |
3469 | resuming, and, if it is, switch to the thread and call | |
3470 | `keep_going_pass_signal`. If TP is not suitable for resuming then this | |
3471 | function will just return without switching threads. */ | |
3472 | ||
3473 | static void | |
3474 | proceed_resume_thread_checked (thread_info *tp) | |
3475 | { | |
3476 | if (!tp->inf->has_execution ()) | |
3477 | { | |
3478 | infrun_debug_printf ("[%s] target has no execution", | |
3479 | tp->ptid.to_string ().c_str ()); | |
3480 | return; | |
3481 | } | |
3482 | ||
3483 | if (tp->resumed ()) | |
3484 | { | |
3485 | infrun_debug_printf ("[%s] resumed", | |
3486 | tp->ptid.to_string ().c_str ()); | |
3487 | gdb_assert (tp->executing () || tp->has_pending_waitstatus ()); | |
3488 | return; | |
3489 | } | |
3490 | ||
3491 | if (thread_is_in_step_over_chain (tp)) | |
3492 | { | |
3493 | infrun_debug_printf ("[%s] needs step-over", | |
3494 | tp->ptid.to_string ().c_str ()); | |
3495 | return; | |
3496 | } | |
3497 | ||
3498 | /* When handling a vfork GDB removes all breakpoints from the program | |
b1e0126e AB |
3499 | space in which the vfork is being handled. If we are following the |
3500 | parent then GDB will set the thread_waiting_for_vfork_done member of | |
3501 | the parent inferior. In this case we should take care to only resume | |
3502 | the vfork parent thread, the kernel will hold this thread suspended | |
3503 | until the vfork child has exited or execd, at which point the parent | |
3504 | will be resumed and a VFORK_DONE event sent to GDB. */ | |
e07d892c MS |
3505 | if (tp->inf->thread_waiting_for_vfork_done != nullptr) |
3506 | { | |
3507 | if (target_is_non_stop_p ()) | |
3508 | { | |
3509 | /* For non-stop targets, regardless of whether GDB is using | |
3510 | all-stop or non-stop mode, threads are controlled | |
3511 | individually. | |
3512 | ||
3513 | When a thread is handling a vfork, breakpoints are removed | |
3514 | from the inferior (well, program space in fact), so it is | |
3515 | critical that we don't try to resume any thread other than the | |
3516 | vfork parent. */ | |
3517 | if (tp != tp->inf->thread_waiting_for_vfork_done) | |
3518 | { | |
3519 | infrun_debug_printf ("[%s] thread %s of this inferior is " | |
3520 | "waiting for vfork-done", | |
3521 | tp->ptid.to_string ().c_str (), | |
3522 | tp->inf->thread_waiting_for_vfork_done | |
3523 | ->ptid.to_string ().c_str ()); | |
3524 | return; | |
3525 | } | |
3526 | } | |
3527 | else | |
3528 | { | |
3529 | /* For all-stop targets, when we attempt to resume the inferior, | |
3530 | we will only resume the vfork parent thread, this is handled | |
3531 | in internal_resume_ptid. | |
3532 | ||
3533 | Additionally, we will always be called with the vfork parent | |
3534 | thread as the current thread (TP) thanks to follow_fork, as | |
3535 | such the following assertion should hold. | |
3536 | ||
3537 | Beyond this there is nothing more that needs to be done | |
3538 | here. */ | |
3539 | gdb_assert (tp == tp->inf->thread_waiting_for_vfork_done); | |
3540 | } | |
3541 | } | |
3542 | ||
b1e0126e AB |
3543 | /* When handling a vfork GDB removes all breakpoints from the program |
3544 | space in which the vfork is being handled. If we are following the | |
3545 | child then GDB will set vfork_child member of the vfork parent | |
3546 | inferior. Once the child has either exited or execd then GDB will | |
3547 | detach from the parent process. Until that point GDB should not | |
3548 | resume any thread in the parent process. */ | |
3549 | if (tp->inf->vfork_child != nullptr) | |
3550 | { | |
3551 | infrun_debug_printf ("[%s] thread is part of a vfork parent, child is %d", | |
3552 | tp->ptid.to_string ().c_str (), | |
3553 | tp->inf->vfork_child->pid); | |
3554 | return; | |
3555 | } | |
3556 | ||
e07d892c MS |
3557 | infrun_debug_printf ("resuming %s", |
3558 | tp->ptid.to_string ().c_str ()); | |
3559 | ||
3560 | execution_control_state ecs (tp); | |
3561 | switch_to_thread (tp); | |
3562 | keep_going_pass_signal (&ecs); | |
3563 | if (!ecs.wait_some_more) | |
3564 | error (_("Command aborted.")); | |
3565 | } | |
3566 | ||
c906108c SS |
3567 | /* Basic routine for continuing the program in various fashions. |
3568 | ||
3569 | ADDR is the address to resume at, or -1 for resume where stopped. | |
aff4e175 AB |
3570 | SIGGNAL is the signal to give it, or GDB_SIGNAL_0 for none, |
3571 | or GDB_SIGNAL_DEFAULT for act according to how it stopped. | |
c906108c SS |
3572 | |
3573 | You should call clear_proceed_status before calling proceed. */ | |
3574 | ||
3575 | void | |
64ce06e4 | 3576 | proceed (CORE_ADDR addr, enum gdb_signal siggnal) |
c906108c | 3577 | { |
3ec3145c SM |
3578 | INFRUN_SCOPED_DEBUG_ENTER_EXIT; |
3579 | ||
e58b0e63 | 3580 | struct gdbarch *gdbarch; |
e58b0e63 | 3581 | CORE_ADDR pc; |
c906108c | 3582 | |
05e1cac2 AB |
3583 | /* If we're stopped at a fork/vfork, switch to either the parent or child |
3584 | thread as defined by the "set follow-fork-mode" command, or, if both | |
3585 | the parent and child are controlled by GDB, and schedule-multiple is | |
3586 | on, follow the child. If none of the above apply then we just proceed | |
e58b0e63 PA |
3587 | resuming the current thread. */ |
3588 | if (!follow_fork ()) | |
3589 | { | |
3590 | /* The target for some reason decided not to resume. */ | |
3591 | normal_stop (); | |
f148b27e | 3592 | if (target_can_async_p ()) |
b1a35af2 | 3593 | inferior_event_handler (INF_EXEC_COMPLETE); |
e58b0e63 PA |
3594 | return; |
3595 | } | |
3596 | ||
842951eb | 3597 | /* We'll update this if & when we switch to a new thread. */ |
a81871f7 | 3598 | update_previous_thread (); |
842951eb | 3599 | |
08036331 | 3600 | thread_info *cur_thr = inferior_thread (); |
b26b06dd AB |
3601 | infrun_debug_printf ("cur_thr = %s", cur_thr->ptid.to_string ().c_str ()); |
3602 | ||
9c742269 SM |
3603 | regcache *regcache = get_thread_regcache (cur_thr); |
3604 | gdbarch = regcache->arch (); | |
3605 | pc = regcache_read_pc_protected (regcache); | |
3606 | ||
99619bea | 3607 | /* Fill in with reasonable starting values. */ |
08036331 | 3608 | init_thread_stepping_state (cur_thr); |
99619bea | 3609 | |
08036331 | 3610 | gdb_assert (!thread_is_in_step_over_chain (cur_thr)); |
c2829269 | 3611 | |
5b6d1e4f PA |
3612 | ptid_t resume_ptid |
3613 | = user_visible_resume_ptid (cur_thr->control.stepping_command); | |
3614 | process_stratum_target *resume_target | |
3615 | = user_visible_resume_target (resume_ptid); | |
3616 | ||
2f4fcf00 PA |
3617 | check_multi_target_resumption (resume_target); |
3618 | ||
2acceee2 | 3619 | if (addr == (CORE_ADDR) -1) |
c906108c | 3620 | { |
f9582a22 | 3621 | const address_space *aspace = cur_thr->inf->aspace.get (); |
74387712 | 3622 | |
351031f2 AB |
3623 | if (cur_thr->stop_pc_p () |
3624 | && pc == cur_thr->stop_pc () | |
af48d08f | 3625 | && breakpoint_here_p (aspace, pc) == ordinary_breakpoint_here |
b2175913 | 3626 | && execution_direction != EXEC_REVERSE) |
3352ef37 AC |
3627 | /* There is a breakpoint at the address we will resume at, |
3628 | step one instruction before inserting breakpoints so that | |
3629 | we do not stop right away (and report a second hit at this | |
b2175913 MS |
3630 | breakpoint). |
3631 | ||
3632 | Note, we don't do this in reverse, because we won't | |
3633 | actually be executing the breakpoint insn anyway. | |
3634 | We'll be (un-)executing the previous instruction. */ | |
08036331 | 3635 | cur_thr->stepping_over_breakpoint = 1; |
515630c5 UW |
3636 | else if (gdbarch_single_step_through_delay_p (gdbarch) |
3637 | && gdbarch_single_step_through_delay (gdbarch, | |
3638 | get_current_frame ())) | |
3352ef37 AC |
3639 | /* We stepped onto an instruction that needs to be stepped |
3640 | again before re-inserting the breakpoint, do so. */ | |
08036331 | 3641 | cur_thr->stepping_over_breakpoint = 1; |
c906108c SS |
3642 | } |
3643 | else | |
3644 | { | |
515630c5 | 3645 | regcache_write_pc (regcache, addr); |
c906108c SS |
3646 | } |
3647 | ||
70509625 | 3648 | if (siggnal != GDB_SIGNAL_DEFAULT) |
1edb66d8 | 3649 | cur_thr->set_stop_signal (siggnal); |
70509625 | 3650 | |
4d9d9d04 PA |
3651 | /* If an exception is thrown from this point on, make sure to |
3652 | propagate GDB's knowledge of the executing state to the | |
3653 | frontend/user running state. */ | |
5b6d1e4f | 3654 | scoped_finish_thread_state finish_state (resume_target, resume_ptid); |
4d9d9d04 PA |
3655 | |
3656 | /* Even if RESUME_PTID is a wildcard, and we end up resuming fewer | |
3657 | threads (e.g., we might need to set threads stepping over | |
3658 | breakpoints first), from the user/frontend's point of view, all | |
3659 | threads in RESUME_PTID are now running. Unless we're calling an | |
3660 | inferior function, as in that case we pretend the inferior | |
3661 | doesn't run at all. */ | |
08036331 | 3662 | if (!cur_thr->control.in_infcall) |
719546c4 | 3663 | set_running (resume_target, resume_ptid, true); |
17b2616c | 3664 | |
b26b06dd AB |
3665 | infrun_debug_printf ("addr=%s, signal=%s, resume_ptid=%s", |
3666 | paddress (gdbarch, addr), | |
3667 | gdb_signal_to_symbol_string (siggnal), | |
3668 | resume_ptid.to_string ().c_str ()); | |
527159b7 | 3669 | |
4d9d9d04 PA |
3670 | annotate_starting (); |
3671 | ||
3672 | /* Make sure that output from GDB appears before output from the | |
3673 | inferior. */ | |
3674 | gdb_flush (gdb_stdout); | |
3675 | ||
d930703d PA |
3676 | /* Since we've marked the inferior running, give it the terminal. A |
3677 | QUIT/Ctrl-C from here on is forwarded to the target (which can | |
3678 | still detect attempts to unblock a stuck connection with repeated | |
3679 | Ctrl-C from within target_pass_ctrlc). */ | |
3680 | target_terminal::inferior (); | |
3681 | ||
4d9d9d04 PA |
3682 | /* In a multi-threaded task we may select another thread and |
3683 | then continue or step. | |
3684 | ||
3685 | But if a thread that we're resuming had stopped at a breakpoint, | |
3686 | it will immediately cause another breakpoint stop without any | |
3687 | execution (i.e. it will report a breakpoint hit incorrectly). So | |
3688 | we must step over it first. | |
3689 | ||
3690 | Look for threads other than the current (TP) that reported a | |
3691 | breakpoint hit and haven't been resumed yet since. */ | |
3692 | ||
3693 | /* If scheduler locking applies, we can avoid iterating over all | |
3694 | threads. */ | |
08036331 | 3695 | if (!non_stop && !schedlock_applies (cur_thr)) |
94cc34af | 3696 | { |
5b6d1e4f PA |
3697 | for (thread_info *tp : all_non_exited_threads (resume_target, |
3698 | resume_ptid)) | |
08036331 | 3699 | { |
f3f8ece4 PA |
3700 | switch_to_thread_no_regs (tp); |
3701 | ||
4d9d9d04 PA |
3702 | /* Ignore the current thread here. It's handled |
3703 | afterwards. */ | |
08036331 | 3704 | if (tp == cur_thr) |
4d9d9d04 | 3705 | continue; |
c906108c | 3706 | |
4d9d9d04 PA |
3707 | if (!thread_still_needs_step_over (tp)) |
3708 | continue; | |
3709 | ||
3710 | gdb_assert (!thread_is_in_step_over_chain (tp)); | |
c906108c | 3711 | |
1eb8556f | 3712 | infrun_debug_printf ("need to step-over [%s] first", |
0fab7955 | 3713 | tp->ptid.to_string ().c_str ()); |
99619bea | 3714 | |
28d5518b | 3715 | global_thread_step_over_chain_enqueue (tp); |
2adfaa28 | 3716 | } |
f3f8ece4 PA |
3717 | |
3718 | switch_to_thread (cur_thr); | |
30852783 UW |
3719 | } |
3720 | ||
4d9d9d04 PA |
3721 | /* Enqueue the current thread last, so that we move all other |
3722 | threads over their breakpoints first. */ | |
08036331 | 3723 | if (cur_thr->stepping_over_breakpoint) |
28d5518b | 3724 | global_thread_step_over_chain_enqueue (cur_thr); |
30852783 | 3725 | |
4d9d9d04 PA |
3726 | /* If the thread isn't started, we'll still need to set its prev_pc, |
3727 | so that switch_back_to_stepped_thread knows the thread hasn't | |
3728 | advanced. Must do this before resuming any thread, as in | |
3729 | all-stop/remote, once we resume we can't send any other packet | |
3730 | until the target stops again. */ | |
fc75c28b | 3731 | cur_thr->prev_pc = regcache_read_pc_protected (regcache); |
99619bea | 3732 | |
a9bc57b9 | 3733 | { |
1192f124 | 3734 | scoped_disable_commit_resumed disable_commit_resumed ("proceeding"); |
8bf10e2e | 3735 | bool step_over_started = start_step_over (); |
c906108c | 3736 | |
a9bc57b9 TT |
3737 | if (step_over_info_valid_p ()) |
3738 | { | |
3739 | /* Either this thread started a new in-line step over, or some | |
3740 | other thread was already doing one. In either case, don't | |
3741 | resume anything else until the step-over is finished. */ | |
3742 | } | |
8bf10e2e | 3743 | else if (step_over_started && !target_is_non_stop_p ()) |
a9bc57b9 TT |
3744 | { |
3745 | /* A new displaced stepping sequence was started. In all-stop, | |
3746 | we can't talk to the target anymore until it next stops. */ | |
3747 | } | |
3748 | else if (!non_stop && target_is_non_stop_p ()) | |
3749 | { | |
3ec3145c SM |
3750 | INFRUN_SCOPED_DEBUG_START_END |
3751 | ("resuming threads, all-stop-on-top-of-non-stop"); | |
3752 | ||
a9bc57b9 TT |
3753 | /* In all-stop, but the target is always in non-stop mode. |
3754 | Start all other threads that are implicitly resumed too. */ | |
5b6d1e4f PA |
3755 | for (thread_info *tp : all_non_exited_threads (resume_target, |
3756 | resume_ptid)) | |
3757 | { | |
3758 | switch_to_thread_no_regs (tp); | |
e07d892c | 3759 | proceed_resume_thread_checked (tp); |
d5f5a83a | 3760 | } |
a9bc57b9 | 3761 | } |
e07d892c MS |
3762 | else |
3763 | proceed_resume_thread_checked (cur_thr); | |
c906108c | 3764 | |
1192f124 SM |
3765 | disable_commit_resumed.reset_and_commit (); |
3766 | } | |
85ad3aaf | 3767 | |
731f534f | 3768 | finish_state.release (); |
c906108c | 3769 | |
873657b9 PA |
3770 | /* If we've switched threads above, switch back to the previously |
3771 | current thread. We don't want the user to see a different | |
3772 | selected thread. */ | |
3773 | switch_to_thread (cur_thr); | |
3774 | ||
0b333c5e PA |
3775 | /* Tell the event loop to wait for it to stop. If the target |
3776 | supports asynchronous execution, it'll do this from within | |
3777 | target_resume. */ | |
362646f5 | 3778 | if (!target_can_async_p ()) |
0b333c5e | 3779 | mark_async_event_handler (infrun_async_inferior_event_token); |
c906108c | 3780 | } |
c906108c SS |
3781 | \f |
3782 | ||
3783 | /* Start remote-debugging of a machine over a serial link. */ | |
96baa820 | 3784 | |
c906108c | 3785 | void |
8621d6a9 | 3786 | start_remote (int from_tty) |
c906108c | 3787 | { |
5b6d1e4f PA |
3788 | inferior *inf = current_inferior (); |
3789 | inf->control.stop_soon = STOP_QUIETLY_REMOTE; | |
43ff13b4 | 3790 | |
1777feb0 | 3791 | /* Always go on waiting for the target, regardless of the mode. */ |
6426a772 | 3792 | /* FIXME: cagney/1999-09-23: At present it isn't possible to |
7e73cedf | 3793 | indicate to wait_for_inferior that a target should timeout if |
6426a772 JM |
3794 | nothing is returned (instead of just blocking). Because of this, |
3795 | targets expecting an immediate response need to, internally, set | |
3796 | things up so that the target_wait() is forced to eventually | |
1777feb0 | 3797 | timeout. */ |
6426a772 JM |
3798 | /* FIXME: cagney/1999-09-24: It isn't possible for target_open() to |
3799 | differentiate to its caller what the state of the target is after | |
3800 | the initial open has been performed. Here we're assuming that | |
3801 | the target has stopped. It should be possible to eventually have | |
3802 | target_open() return to the caller an indication that the target | |
3803 | is currently running and GDB state should be set to the same as | |
1777feb0 | 3804 | for an async run. */ |
5b6d1e4f | 3805 | wait_for_inferior (inf); |
8621d6a9 DJ |
3806 | |
3807 | /* Now that the inferior has stopped, do any bookkeeping like | |
3808 | loading shared libraries. We want to do this before normal_stop, | |
3809 | so that the displayed frame is up to date. */ | |
a7aba266 | 3810 | post_create_inferior (from_tty); |
8621d6a9 | 3811 | |
6426a772 | 3812 | normal_stop (); |
c906108c SS |
3813 | } |
3814 | ||
3815 | /* Initialize static vars when a new inferior begins. */ | |
3816 | ||
3817 | void | |
96baa820 | 3818 | init_wait_for_inferior (void) |
c906108c SS |
3819 | { |
3820 | /* These are meaningless until the first time through wait_for_inferior. */ | |
c906108c | 3821 | |
c906108c SS |
3822 | breakpoint_init_inferior (inf_starting); |
3823 | ||
70509625 | 3824 | clear_proceed_status (0); |
9f976b41 | 3825 | |
ab1ddbcf | 3826 | nullify_last_target_wait_ptid (); |
237fc4c9 | 3827 | |
a81871f7 | 3828 | update_previous_thread (); |
c906108c | 3829 | } |
237fc4c9 | 3830 | |
c906108c | 3831 | \f |
488f131b | 3832 | |
ec9499be | 3833 | static void handle_inferior_event (struct execution_control_state *ecs); |
cd0fc7c3 | 3834 | |
568d6575 UW |
3835 | static void handle_step_into_function (struct gdbarch *gdbarch, |
3836 | struct execution_control_state *ecs); | |
3837 | static void handle_step_into_function_backward (struct gdbarch *gdbarch, | |
3838 | struct execution_control_state *ecs); | |
4f5d7f63 | 3839 | static void handle_signal_stop (struct execution_control_state *ecs); |
186c406b | 3840 | static void check_exception_resume (struct execution_control_state *, |
9efe17a3 | 3841 | frame_info_ptr); |
611c83ae | 3842 | |
bdc36728 | 3843 | static void end_stepping_range (struct execution_control_state *ecs); |
22bcd14b | 3844 | static void stop_waiting (struct execution_control_state *ecs); |
d4f3574e | 3845 | static void keep_going (struct execution_control_state *ecs); |
94c57d6a | 3846 | static void process_event_stop_test (struct execution_control_state *ecs); |
c4464ade | 3847 | static bool switch_back_to_stepped_thread (struct execution_control_state *ecs); |
104c1213 | 3848 | |
252fbfc8 PA |
3849 | /* This function is attached as a "thread_stop_requested" observer. |
3850 | Cleanup local state that assumed the PTID was to be resumed, and | |
3851 | report the stop to the frontend. */ | |
3852 | ||
2c0b251b | 3853 | static void |
252fbfc8 PA |
3854 | infrun_thread_stop_requested (ptid_t ptid) |
3855 | { | |
5b6d1e4f PA |
3856 | process_stratum_target *curr_target = current_inferior ()->process_target (); |
3857 | ||
c65d6b55 PA |
3858 | /* PTID was requested to stop. If the thread was already stopped, |
3859 | but the user/frontend doesn't know about that yet (e.g., the | |
3860 | thread had been temporarily paused for some step-over), set up | |
3861 | for reporting the stop now. */ | |
5b6d1e4f | 3862 | for (thread_info *tp : all_threads (curr_target, ptid)) |
08036331 PA |
3863 | { |
3864 | if (tp->state != THREAD_RUNNING) | |
3865 | continue; | |
611841bb | 3866 | if (tp->executing ()) |
08036331 | 3867 | continue; |
c65d6b55 | 3868 | |
08036331 PA |
3869 | /* Remove matching threads from the step-over queue, so |
3870 | start_step_over doesn't try to resume them | |
3871 | automatically. */ | |
3872 | if (thread_is_in_step_over_chain (tp)) | |
28d5518b | 3873 | global_thread_step_over_chain_remove (tp); |
c65d6b55 | 3874 | |
08036331 PA |
3875 | /* If the thread is stopped, but the user/frontend doesn't |
3876 | know about that yet, queue a pending event, as if the | |
3877 | thread had just stopped now. Unless the thread already had | |
3878 | a pending event. */ | |
1edb66d8 | 3879 | if (!tp->has_pending_waitstatus ()) |
08036331 | 3880 | { |
1edb66d8 | 3881 | target_waitstatus ws; |
183be222 | 3882 | ws.set_stopped (GDB_SIGNAL_0); |
1edb66d8 | 3883 | tp->set_pending_waitstatus (ws); |
08036331 | 3884 | } |
c65d6b55 | 3885 | |
08036331 PA |
3886 | /* Clear the inline-frame state, since we're re-processing the |
3887 | stop. */ | |
5b6d1e4f | 3888 | clear_inline_frame_state (tp); |
c65d6b55 | 3889 | |
08036331 PA |
3890 | /* If this thread was paused because some other thread was |
3891 | doing an inline-step over, let that finish first. Once | |
3892 | that happens, we'll restart all threads and consume pending | |
3893 | stop events then. */ | |
3894 | if (step_over_info_valid_p ()) | |
3895 | continue; | |
3896 | ||
3897 | /* Otherwise we can process the (new) pending event now. Set | |
3898 | it so this pending event is considered by | |
3899 | do_target_wait. */ | |
7846f3aa | 3900 | tp->set_resumed (true); |
08036331 | 3901 | } |
252fbfc8 PA |
3902 | } |
3903 | ||
0cbcdb96 PA |
3904 | /* Delete the step resume, single-step and longjmp/exception resume |
3905 | breakpoints of TP. */ | |
4e1c45ea | 3906 | |
0cbcdb96 PA |
3907 | static void |
3908 | delete_thread_infrun_breakpoints (struct thread_info *tp) | |
4e1c45ea | 3909 | { |
0cbcdb96 PA |
3910 | delete_step_resume_breakpoint (tp); |
3911 | delete_exception_resume_breakpoint (tp); | |
34b7e8a6 | 3912 | delete_single_step_breakpoints (tp); |
4e1c45ea PA |
3913 | } |
3914 | ||
0cbcdb96 PA |
3915 | /* If the target still has execution, call FUNC for each thread that |
3916 | just stopped. In all-stop, that's all the non-exited threads; in | |
3917 | non-stop, that's the current thread, only. */ | |
3918 | ||
3919 | typedef void (*for_each_just_stopped_thread_callback_func) | |
3920 | (struct thread_info *tp); | |
4e1c45ea PA |
3921 | |
3922 | static void | |
0cbcdb96 | 3923 | for_each_just_stopped_thread (for_each_just_stopped_thread_callback_func func) |
4e1c45ea | 3924 | { |
55f6301a | 3925 | if (!target_has_execution () || inferior_ptid == null_ptid) |
4e1c45ea PA |
3926 | return; |
3927 | ||
fbea99ea | 3928 | if (target_is_non_stop_p ()) |
4e1c45ea | 3929 | { |
0cbcdb96 PA |
3930 | /* If in non-stop mode, only the current thread stopped. */ |
3931 | func (inferior_thread ()); | |
4e1c45ea PA |
3932 | } |
3933 | else | |
0cbcdb96 | 3934 | { |
0cbcdb96 | 3935 | /* In all-stop mode, all threads have stopped. */ |
08036331 PA |
3936 | for (thread_info *tp : all_non_exited_threads ()) |
3937 | func (tp); | |
0cbcdb96 PA |
3938 | } |
3939 | } | |
3940 | ||
3941 | /* Delete the step resume and longjmp/exception resume breakpoints of | |
3942 | the threads that just stopped. */ | |
3943 | ||
3944 | static void | |
3945 | delete_just_stopped_threads_infrun_breakpoints (void) | |
3946 | { | |
3947 | for_each_just_stopped_thread (delete_thread_infrun_breakpoints); | |
34b7e8a6 PA |
3948 | } |
3949 | ||
3950 | /* Delete the single-step breakpoints of the threads that just | |
3951 | stopped. */ | |
7c16b83e | 3952 | |
34b7e8a6 PA |
3953 | static void |
3954 | delete_just_stopped_threads_single_step_breakpoints (void) | |
3955 | { | |
3956 | for_each_just_stopped_thread (delete_single_step_breakpoints); | |
4e1c45ea PA |
3957 | } |
3958 | ||
221e1a37 | 3959 | /* See infrun.h. */ |
223698f8 | 3960 | |
221e1a37 | 3961 | void |
223698f8 | 3962 | print_target_wait_results (ptid_t waiton_ptid, ptid_t result_ptid, |
c272a98c | 3963 | const struct target_waitstatus &ws) |
223698f8 | 3964 | { |
17e971f7 SM |
3965 | infrun_debug_printf ("target_wait (%s [%s], status) =", |
3966 | waiton_ptid.to_string ().c_str (), | |
e71daf80 | 3967 | target_pid_to_str (waiton_ptid).c_str ()); |
17e971f7 SM |
3968 | infrun_debug_printf (" %s [%s],", |
3969 | result_ptid.to_string ().c_str (), | |
e71daf80 | 3970 | target_pid_to_str (result_ptid).c_str ()); |
c272a98c | 3971 | infrun_debug_printf (" %s", ws.to_string ().c_str ()); |
223698f8 DE |
3972 | } |
3973 | ||
372316f1 PA |
3974 | /* Select a thread at random, out of those which are resumed and have |
3975 | had events. */ | |
3976 | ||
3977 | static struct thread_info * | |
5b6d1e4f | 3978 | random_pending_event_thread (inferior *inf, ptid_t waiton_ptid) |
372316f1 | 3979 | { |
71a23490 SM |
3980 | process_stratum_target *proc_target = inf->process_target (); |
3981 | thread_info *thread | |
3982 | = proc_target->random_resumed_with_pending_wait_status (inf, waiton_ptid); | |
08036331 | 3983 | |
71a23490 | 3984 | if (thread == nullptr) |
08036331 | 3985 | { |
71a23490 SM |
3986 | infrun_debug_printf ("None found."); |
3987 | return nullptr; | |
3988 | } | |
372316f1 | 3989 | |
0fab7955 | 3990 | infrun_debug_printf ("Found %s.", thread->ptid.to_string ().c_str ()); |
71a23490 SM |
3991 | gdb_assert (thread->resumed ()); |
3992 | gdb_assert (thread->has_pending_waitstatus ()); | |
372316f1 | 3993 | |
71a23490 | 3994 | return thread; |
372316f1 PA |
3995 | } |
3996 | ||
3997 | /* Wrapper for target_wait that first checks whether threads have | |
3998 | pending statuses to report before actually asking the target for | |
5b6d1e4f PA |
3999 | more events. INF is the inferior we're using to call target_wait |
4000 | on. */ | |
372316f1 PA |
4001 | |
4002 | static ptid_t | |
5b6d1e4f | 4003 | do_target_wait_1 (inferior *inf, ptid_t ptid, |
b60cea74 | 4004 | target_waitstatus *status, target_wait_flags options) |
372316f1 | 4005 | { |
372316f1 PA |
4006 | struct thread_info *tp; |
4007 | ||
24ed6739 AB |
4008 | /* We know that we are looking for an event in the target of inferior |
4009 | INF, but we don't know which thread the event might come from. As | |
4010 | such we want to make sure that INFERIOR_PTID is reset so that none of | |
4011 | the wait code relies on it - doing so is always a mistake. */ | |
4012 | switch_to_inferior_no_thread (inf); | |
4013 | ||
372316f1 PA |
4014 | /* First check if there is a resumed thread with a wait status |
4015 | pending. */ | |
d7e15655 | 4016 | if (ptid == minus_one_ptid || ptid.is_pid ()) |
372316f1 | 4017 | { |
5b6d1e4f | 4018 | tp = random_pending_event_thread (inf, ptid); |
372316f1 PA |
4019 | } |
4020 | else | |
4021 | { | |
1eb8556f | 4022 | infrun_debug_printf ("Waiting for specific thread %s.", |
0fab7955 | 4023 | ptid.to_string ().c_str ()); |
372316f1 PA |
4024 | |
4025 | /* We have a specific thread to check. */ | |
3c8af02f | 4026 | tp = inf->find_thread (ptid); |
03acd4d8 | 4027 | gdb_assert (tp != nullptr); |
1edb66d8 | 4028 | if (!tp->has_pending_waitstatus ()) |
03acd4d8 | 4029 | tp = nullptr; |
372316f1 PA |
4030 | } |
4031 | ||
03acd4d8 | 4032 | if (tp != nullptr |
1edb66d8 SM |
4033 | && (tp->stop_reason () == TARGET_STOPPED_BY_SW_BREAKPOINT |
4034 | || tp->stop_reason () == TARGET_STOPPED_BY_HW_BREAKPOINT)) | |
372316f1 | 4035 | { |
00431a78 | 4036 | struct regcache *regcache = get_thread_regcache (tp); |
ac7936df | 4037 | struct gdbarch *gdbarch = regcache->arch (); |
372316f1 PA |
4038 | CORE_ADDR pc; |
4039 | int discard = 0; | |
4040 | ||
4041 | pc = regcache_read_pc (regcache); | |
4042 | ||
1edb66d8 | 4043 | if (pc != tp->stop_pc ()) |
372316f1 | 4044 | { |
1eb8556f | 4045 | infrun_debug_printf ("PC of %s changed. was=%s, now=%s", |
0fab7955 | 4046 | tp->ptid.to_string ().c_str (), |
1edb66d8 | 4047 | paddress (gdbarch, tp->stop_pc ()), |
1eb8556f | 4048 | paddress (gdbarch, pc)); |
372316f1 PA |
4049 | discard = 1; |
4050 | } | |
f9582a22 | 4051 | else if (!breakpoint_inserted_here_p (tp->inf->aspace.get (), pc)) |
372316f1 | 4052 | { |
1eb8556f | 4053 | infrun_debug_printf ("previous breakpoint of %s, at %s gone", |
0fab7955 | 4054 | tp->ptid.to_string ().c_str (), |
1eb8556f | 4055 | paddress (gdbarch, pc)); |
372316f1 PA |
4056 | |
4057 | discard = 1; | |
4058 | } | |
4059 | ||
4060 | if (discard) | |
4061 | { | |
1eb8556f | 4062 | infrun_debug_printf ("pending event of %s cancelled.", |
0fab7955 | 4063 | tp->ptid.to_string ().c_str ()); |
372316f1 | 4064 | |
1edb66d8 SM |
4065 | tp->clear_pending_waitstatus (); |
4066 | target_waitstatus ws; | |
183be222 | 4067 | ws.set_spurious (); |
1edb66d8 SM |
4068 | tp->set_pending_waitstatus (ws); |
4069 | tp->set_stop_reason (TARGET_STOPPED_BY_NO_REASON); | |
372316f1 PA |
4070 | } |
4071 | } | |
4072 | ||
03acd4d8 | 4073 | if (tp != nullptr) |
372316f1 | 4074 | { |
1eb8556f | 4075 | infrun_debug_printf ("Using pending wait status %s for %s.", |
7dca2ea7 | 4076 | tp->pending_waitstatus ().to_string ().c_str (), |
0fab7955 | 4077 | tp->ptid.to_string ().c_str ()); |
372316f1 PA |
4078 | |
4079 | /* Now that we've selected our final event LWP, un-adjust its PC | |
4080 | if it was a software breakpoint (and the target doesn't | |
4081 | always adjust the PC itself). */ | |
1edb66d8 | 4082 | if (tp->stop_reason () == TARGET_STOPPED_BY_SW_BREAKPOINT |
372316f1 PA |
4083 | && !target_supports_stopped_by_sw_breakpoint ()) |
4084 | { | |
4085 | struct regcache *regcache; | |
4086 | struct gdbarch *gdbarch; | |
4087 | int decr_pc; | |
4088 | ||
00431a78 | 4089 | regcache = get_thread_regcache (tp); |
ac7936df | 4090 | gdbarch = regcache->arch (); |
372316f1 PA |
4091 | |
4092 | decr_pc = gdbarch_decr_pc_after_break (gdbarch); | |
4093 | if (decr_pc != 0) | |
4094 | { | |
4095 | CORE_ADDR pc; | |
4096 | ||
4097 | pc = regcache_read_pc (regcache); | |
4098 | regcache_write_pc (regcache, pc + decr_pc); | |
4099 | } | |
4100 | } | |
4101 | ||
1edb66d8 SM |
4102 | tp->set_stop_reason (TARGET_STOPPED_BY_NO_REASON); |
4103 | *status = tp->pending_waitstatus (); | |
4104 | tp->clear_pending_waitstatus (); | |
372316f1 PA |
4105 | |
4106 | /* Wake up the event loop again, until all pending events are | |
4107 | processed. */ | |
4108 | if (target_is_async_p ()) | |
4109 | mark_async_event_handler (infrun_async_inferior_event_token); | |
4110 | return tp->ptid; | |
4111 | } | |
4112 | ||
4113 | /* But if we don't find one, we'll have to wait. */ | |
4114 | ||
d3a07122 SM |
4115 | /* We can't ask a non-async target to do a non-blocking wait, so this will be |
4116 | a blocking wait. */ | |
71247709 | 4117 | if (!target_can_async_p ()) |
d3a07122 SM |
4118 | options &= ~TARGET_WNOHANG; |
4119 | ||
fb85cece | 4120 | return target_wait (ptid, status, options); |
372316f1 PA |
4121 | } |
4122 | ||
5b6d1e4f PA |
4123 | /* Wrapper for target_wait that first checks whether threads have |
4124 | pending statuses to report before actually asking the target for | |
b3e3a4c1 | 4125 | more events. Polls for events from all inferiors/targets. */ |
5b6d1e4f PA |
4126 | |
4127 | static bool | |
ac0d67ed | 4128 | do_target_wait (execution_control_state *ecs, target_wait_flags options) |
5b6d1e4f PA |
4129 | { |
4130 | int num_inferiors = 0; | |
4131 | int random_selector; | |
4132 | ||
b3e3a4c1 SM |
4133 | /* For fairness, we pick the first inferior/target to poll at random |
4134 | out of all inferiors that may report events, and then continue | |
4135 | polling the rest of the inferior list starting from that one in a | |
4136 | circular fashion until the whole list is polled once. */ | |
5b6d1e4f | 4137 | |
ac0d67ed | 4138 | auto inferior_matches = [] (inferior *inf) |
5b6d1e4f | 4139 | { |
ac0d67ed | 4140 | return inf->process_target () != nullptr; |
5b6d1e4f PA |
4141 | }; |
4142 | ||
b3e3a4c1 | 4143 | /* First see how many matching inferiors we have. */ |
5b6d1e4f PA |
4144 | for (inferior *inf : all_inferiors ()) |
4145 | if (inferior_matches (inf)) | |
4146 | num_inferiors++; | |
4147 | ||
4148 | if (num_inferiors == 0) | |
4149 | { | |
183be222 | 4150 | ecs->ws.set_ignore (); |
5b6d1e4f PA |
4151 | return false; |
4152 | } | |
4153 | ||
b3e3a4c1 | 4154 | /* Now randomly pick an inferior out of those that matched. */ |
5b6d1e4f PA |
4155 | random_selector = (int) |
4156 | ((num_inferiors * (double) rand ()) / (RAND_MAX + 1.0)); | |
4157 | ||
1eb8556f SM |
4158 | if (num_inferiors > 1) |
4159 | infrun_debug_printf ("Found %d inferiors, starting at #%d", | |
4160 | num_inferiors, random_selector); | |
5b6d1e4f | 4161 | |
b3e3a4c1 | 4162 | /* Select the Nth inferior that matched. */ |
5b6d1e4f PA |
4163 | |
4164 | inferior *selected = nullptr; | |
4165 | ||
4166 | for (inferior *inf : all_inferiors ()) | |
4167 | if (inferior_matches (inf)) | |
4168 | if (random_selector-- == 0) | |
4169 | { | |
4170 | selected = inf; | |
4171 | break; | |
4172 | } | |
4173 | ||
b3e3a4c1 | 4174 | /* Now poll for events out of each of the matching inferior's |
5b6d1e4f PA |
4175 | targets, starting from the selected one. */ |
4176 | ||
4177 | auto do_wait = [&] (inferior *inf) | |
4178 | { | |
ac0d67ed | 4179 | ecs->ptid = do_target_wait_1 (inf, minus_one_ptid, &ecs->ws, options); |
5b6d1e4f | 4180 | ecs->target = inf->process_target (); |
183be222 | 4181 | return (ecs->ws.kind () != TARGET_WAITKIND_IGNORE); |
5b6d1e4f PA |
4182 | }; |
4183 | ||
b3e3a4c1 SM |
4184 | /* Needed in 'all-stop + target-non-stop' mode, because we end up |
4185 | here spuriously after the target is all stopped and we've already | |
5b6d1e4f PA |
4186 | reported the stop to the user, polling for events. */ |
4187 | scoped_restore_current_thread restore_thread; | |
4188 | ||
08bdefb5 PA |
4189 | intrusive_list_iterator<inferior> start |
4190 | = inferior_list.iterator_to (*selected); | |
4191 | ||
4192 | for (intrusive_list_iterator<inferior> it = start; | |
4193 | it != inferior_list.end (); | |
4194 | ++it) | |
4195 | { | |
4196 | inferior *inf = &*it; | |
4197 | ||
4198 | if (inferior_matches (inf) && do_wait (inf)) | |
5b6d1e4f | 4199 | return true; |
08bdefb5 | 4200 | } |
5b6d1e4f | 4201 | |
08bdefb5 PA |
4202 | for (intrusive_list_iterator<inferior> it = inferior_list.begin (); |
4203 | it != start; | |
4204 | ++it) | |
4205 | { | |
4206 | inferior *inf = &*it; | |
4207 | ||
4208 | if (inferior_matches (inf) && do_wait (inf)) | |
5b6d1e4f | 4209 | return true; |
08bdefb5 | 4210 | } |
5b6d1e4f | 4211 | |
183be222 | 4212 | ecs->ws.set_ignore (); |
5b6d1e4f PA |
4213 | return false; |
4214 | } | |
4215 | ||
8ff53139 PA |
4216 | /* An event reported by wait_one. */ |
4217 | ||
4218 | struct wait_one_event | |
4219 | { | |
4220 | /* The target the event came out of. */ | |
4221 | process_stratum_target *target; | |
4222 | ||
4223 | /* The PTID the event was for. */ | |
4224 | ptid_t ptid; | |
4225 | ||
4226 | /* The waitstatus. */ | |
4227 | target_waitstatus ws; | |
4228 | }; | |
4229 | ||
4230 | static bool handle_one (const wait_one_event &event); | |
21d48304 | 4231 | static int finish_step_over (struct execution_control_state *ecs); |
8ff53139 | 4232 | |
24291992 PA |
4233 | /* Prepare and stabilize the inferior for detaching it. E.g., |
4234 | detaching while a thread is displaced stepping is a recipe for | |
4235 | crashing it, as nothing would readjust the PC out of the scratch | |
4236 | pad. */ | |
4237 | ||
4238 | void | |
4239 | prepare_for_detach (void) | |
4240 | { | |
4241 | struct inferior *inf = current_inferior (); | |
f2907e49 | 4242 | ptid_t pid_ptid = ptid_t (inf->pid); |
8ff53139 | 4243 | scoped_restore_current_thread restore_thread; |
24291992 | 4244 | |
9bcb1f16 | 4245 | scoped_restore restore_detaching = make_scoped_restore (&inf->detaching, true); |
24291992 | 4246 | |
8ff53139 PA |
4247 | /* Remove all threads of INF from the global step-over chain. We |
4248 | want to stop any ongoing step-over, not start any new one. */ | |
8b6a69b2 SM |
4249 | thread_step_over_list_safe_range range |
4250 | = make_thread_step_over_list_safe_range (global_thread_step_over_list); | |
4251 | ||
4252 | for (thread_info *tp : range) | |
4253 | if (tp->inf == inf) | |
4254 | { | |
4255 | infrun_debug_printf ("removing thread %s from global step over chain", | |
0fab7955 | 4256 | tp->ptid.to_string ().c_str ()); |
8ff53139 | 4257 | global_thread_step_over_chain_remove (tp); |
8b6a69b2 | 4258 | } |
24291992 | 4259 | |
ac7d717c PA |
4260 | /* If we were already in the middle of an inline step-over, and the |
4261 | thread stepping belongs to the inferior we're detaching, we need | |
4262 | to restart the threads of other inferiors. */ | |
4263 | if (step_over_info.thread != -1) | |
4264 | { | |
4265 | infrun_debug_printf ("inline step-over in-process while detaching"); | |
4266 | ||
4267 | thread_info *thr = find_thread_global_id (step_over_info.thread); | |
4268 | if (thr->inf == inf) | |
4269 | { | |
4270 | /* Since we removed threads of INF from the step-over chain, | |
4271 | we know this won't start a step-over for INF. */ | |
4272 | clear_step_over_info (); | |
4273 | ||
4274 | if (target_is_non_stop_p ()) | |
4275 | { | |
4276 | /* Start a new step-over in another thread if there's | |
4277 | one that needs it. */ | |
4278 | start_step_over (); | |
4279 | ||
4280 | /* Restart all other threads (except the | |
4281 | previously-stepping thread, since that one is still | |
4282 | running). */ | |
4283 | if (!step_over_info_valid_p ()) | |
4284 | restart_threads (thr); | |
4285 | } | |
4286 | } | |
4287 | } | |
4288 | ||
8ff53139 PA |
4289 | if (displaced_step_in_progress (inf)) |
4290 | { | |
4291 | infrun_debug_printf ("displaced-stepping in-process while detaching"); | |
24291992 | 4292 | |
8ff53139 | 4293 | /* Stop threads currently displaced stepping, aborting it. */ |
24291992 | 4294 | |
8ff53139 PA |
4295 | for (thread_info *thr : inf->non_exited_threads ()) |
4296 | { | |
4297 | if (thr->displaced_step_state.in_progress ()) | |
4298 | { | |
611841bb | 4299 | if (thr->executing ()) |
8ff53139 PA |
4300 | { |
4301 | if (!thr->stop_requested) | |
4302 | { | |
4303 | target_stop (thr->ptid); | |
4304 | thr->stop_requested = true; | |
4305 | } | |
4306 | } | |
4307 | else | |
7846f3aa | 4308 | thr->set_resumed (false); |
8ff53139 PA |
4309 | } |
4310 | } | |
24291992 | 4311 | |
8ff53139 PA |
4312 | while (displaced_step_in_progress (inf)) |
4313 | { | |
4314 | wait_one_event event; | |
24291992 | 4315 | |
8ff53139 PA |
4316 | event.target = inf->process_target (); |
4317 | event.ptid = do_target_wait_1 (inf, pid_ptid, &event.ws, 0); | |
24291992 | 4318 | |
8ff53139 | 4319 | if (debug_infrun) |
c272a98c | 4320 | print_target_wait_results (pid_ptid, event.ptid, event.ws); |
24291992 | 4321 | |
8ff53139 PA |
4322 | handle_one (event); |
4323 | } | |
24291992 | 4324 | |
8ff53139 PA |
4325 | /* It's OK to leave some of the threads of INF stopped, since |
4326 | they'll be detached shortly. */ | |
24291992 | 4327 | } |
24291992 PA |
4328 | } |
4329 | ||
e0c01ce6 PA |
4330 | /* If all-stop, but there exists a non-stop target, stop all threads |
4331 | now that we're presenting the stop to the user. */ | |
4332 | ||
4333 | static void | |
4334 | stop_all_threads_if_all_stop_mode () | |
4335 | { | |
4336 | if (!non_stop && exists_non_stop_target ()) | |
4337 | stop_all_threads ("presenting stop to user in all-stop"); | |
4338 | } | |
4339 | ||
cd0fc7c3 | 4340 | /* Wait for control to return from inferior to debugger. |
ae123ec6 | 4341 | |
cd0fc7c3 SS |
4342 | If inferior gets a signal, we may decide to start it up again |
4343 | instead of returning. That is why there is a loop in this function. | |
4344 | When this function actually returns it means the inferior | |
4345 | should be left stopped and GDB should read more commands. */ | |
4346 | ||
5b6d1e4f PA |
4347 | static void |
4348 | wait_for_inferior (inferior *inf) | |
cd0fc7c3 | 4349 | { |
1eb8556f | 4350 | infrun_debug_printf ("wait_for_inferior ()"); |
527159b7 | 4351 | |
4c41382a | 4352 | SCOPE_EXIT { delete_just_stopped_threads_infrun_breakpoints (); }; |
cd0fc7c3 | 4353 | |
e6f5c25b PA |
4354 | /* If an error happens while handling the event, propagate GDB's |
4355 | knowledge of the executing state to the frontend/user running | |
4356 | state. */ | |
5b6d1e4f PA |
4357 | scoped_finish_thread_state finish_state |
4358 | (inf->process_target (), minus_one_ptid); | |
e6f5c25b | 4359 | |
c906108c SS |
4360 | while (1) |
4361 | { | |
aa563d16 | 4362 | execution_control_state ecs; |
29f49a6a | 4363 | |
ec9499be | 4364 | overlay_cache_invalid = 1; |
ec9499be | 4365 | |
f15cb84a YQ |
4366 | /* Flush target cache before starting to handle each event. |
4367 | Target was running and cache could be stale. This is just a | |
4368 | heuristic. Running threads may modify target memory, but we | |
4369 | don't get any event. */ | |
41336620 | 4370 | target_dcache_invalidate (current_program_space->aspace); |
f15cb84a | 4371 | |
aa563d16 TT |
4372 | ecs.ptid = do_target_wait_1 (inf, minus_one_ptid, &ecs.ws, 0); |
4373 | ecs.target = inf->process_target (); | |
c906108c | 4374 | |
f00150c9 | 4375 | if (debug_infrun) |
aa563d16 | 4376 | print_target_wait_results (minus_one_ptid, ecs.ptid, ecs.ws); |
f00150c9 | 4377 | |
cd0fc7c3 | 4378 | /* Now figure out what to do with the result of the result. */ |
aa563d16 | 4379 | handle_inferior_event (&ecs); |
c906108c | 4380 | |
aa563d16 | 4381 | if (!ecs.wait_some_more) |
cd0fc7c3 SS |
4382 | break; |
4383 | } | |
4e1c45ea | 4384 | |
e0c01ce6 PA |
4385 | stop_all_threads_if_all_stop_mode (); |
4386 | ||
e6f5c25b | 4387 | /* No error, don't finish the state yet. */ |
731f534f | 4388 | finish_state.release (); |
cd0fc7c3 | 4389 | } |
c906108c | 4390 | |
d3d4baed PA |
4391 | /* Cleanup that reinstalls the readline callback handler, if the |
4392 | target is running in the background. If while handling the target | |
4393 | event something triggered a secondary prompt, like e.g., a | |
4394 | pagination prompt, we'll have removed the callback handler (see | |
4395 | gdb_readline_wrapper_line). Need to do this as we go back to the | |
4396 | event loop, ready to process further input. Note this has no | |
4397 | effect if the handler hasn't actually been removed, because calling | |
4398 | rl_callback_handler_install resets the line buffer, thus losing | |
4399 | input. */ | |
4400 | ||
4401 | static void | |
d238133d | 4402 | reinstall_readline_callback_handler_cleanup () |
d3d4baed | 4403 | { |
3b12939d PA |
4404 | struct ui *ui = current_ui; |
4405 | ||
4406 | if (!ui->async) | |
6c400b59 PA |
4407 | { |
4408 | /* We're not going back to the top level event loop yet. Don't | |
4409 | install the readline callback, as it'd prep the terminal, | |
4410 | readline-style (raw, noecho) (e.g., --batch). We'll install | |
4411 | it the next time the prompt is displayed, when we're ready | |
4412 | for input. */ | |
4413 | return; | |
4414 | } | |
4415 | ||
3b12939d | 4416 | if (ui->command_editing && ui->prompt_state != PROMPT_BLOCKED) |
d3d4baed PA |
4417 | gdb_rl_callback_handler_reinstall (); |
4418 | } | |
4419 | ||
243a9253 | 4420 | /* Clean up the FSMs of threads that are now stopped. In non-stop, |
7730e5c6 PA |
4421 | that's just the event thread. In all-stop, that's all threads. In |
4422 | all-stop, threads that had a pending exit no longer have a reason | |
4423 | to be around, as their FSMs/commands are canceled, so we delete | |
4424 | them. This avoids "info threads" listing such threads as if they | |
4425 | were alive (and failing to read their registers), the user being | |
4426 | able to select and resume them (and that failing), etc. */ | |
243a9253 PA |
4427 | |
4428 | static void | |
4429 | clean_up_just_stopped_threads_fsms (struct execution_control_state *ecs) | |
4430 | { | |
22517040 SM |
4431 | /* The first clean_up call below assumes the event thread is the current |
4432 | one. */ | |
4433 | if (ecs->event_thread != nullptr) | |
4434 | gdb_assert (ecs->event_thread == inferior_thread ()); | |
4435 | ||
573269a8 LS |
4436 | if (ecs->event_thread != nullptr |
4437 | && ecs->event_thread->thread_fsm () != nullptr) | |
4438 | ecs->event_thread->thread_fsm ()->clean_up (ecs->event_thread); | |
243a9253 PA |
4439 | |
4440 | if (!non_stop) | |
4441 | { | |
22517040 SM |
4442 | scoped_restore_current_thread restore_thread; |
4443 | ||
7730e5c6 | 4444 | for (thread_info *thr : all_threads_safe ()) |
dda83cd7 | 4445 | { |
7730e5c6 | 4446 | if (thr->state == THREAD_EXITED) |
243a9253 | 4447 | continue; |
7730e5c6 | 4448 | |
243a9253 PA |
4449 | if (thr == ecs->event_thread) |
4450 | continue; | |
4451 | ||
7730e5c6 PA |
4452 | if (thr->thread_fsm () != nullptr) |
4453 | { | |
4454 | switch_to_thread (thr); | |
4455 | thr->thread_fsm ()->clean_up (thr); | |
4456 | } | |
4457 | ||
4458 | /* As we are cancelling the command/FSM of this thread, | |
4459 | whatever was the reason we needed to report a thread | |
4460 | exited event to the user, that reason is gone. Delete | |
4461 | the thread, so that the user doesn't see it in the thread | |
4462 | list, the next proceed doesn't try to resume it, etc. */ | |
4463 | if (thr->has_pending_waitstatus () | |
4464 | && (thr->pending_waitstatus ().kind () | |
4465 | == TARGET_WAITKIND_THREAD_EXITED)) | |
4466 | delete_thread (thr); | |
243a9253 | 4467 | } |
243a9253 PA |
4468 | } |
4469 | } | |
4470 | ||
3b12939d PA |
4471 | /* Helper for all_uis_check_sync_execution_done that works on the |
4472 | current UI. */ | |
4473 | ||
4474 | static void | |
4475 | check_curr_ui_sync_execution_done (void) | |
4476 | { | |
4477 | struct ui *ui = current_ui; | |
4478 | ||
4479 | if (ui->prompt_state == PROMPT_NEEDED | |
4480 | && ui->async | |
4481 | && !gdb_in_secondary_prompt_p (ui)) | |
4482 | { | |
223ffa71 | 4483 | target_terminal::ours (); |
c3d321de | 4484 | top_level_interpreter ()->on_sync_execution_done (); |
8f7f9b3a | 4485 | ui->register_file_handler (); |
3b12939d PA |
4486 | } |
4487 | } | |
4488 | ||
4489 | /* See infrun.h. */ | |
4490 | ||
4491 | void | |
4492 | all_uis_check_sync_execution_done (void) | |
4493 | { | |
0e454242 | 4494 | SWITCH_THRU_ALL_UIS () |
3b12939d PA |
4495 | { |
4496 | check_curr_ui_sync_execution_done (); | |
4497 | } | |
4498 | } | |
4499 | ||
a8836c93 PA |
4500 | /* See infrun.h. */ |
4501 | ||
4502 | void | |
4503 | all_uis_on_sync_execution_starting (void) | |
4504 | { | |
0e454242 | 4505 | SWITCH_THRU_ALL_UIS () |
a8836c93 PA |
4506 | { |
4507 | if (current_ui->prompt_state == PROMPT_NEEDED) | |
4508 | async_disable_stdin (); | |
4509 | } | |
4510 | } | |
4511 | ||
0ace6ace PA |
4512 | /* A quit_handler callback installed while we're handling inferior |
4513 | events. */ | |
4514 | ||
4515 | static void | |
4516 | infrun_quit_handler () | |
4517 | { | |
4518 | if (target_terminal::is_ours ()) | |
4519 | { | |
4520 | /* Do nothing. | |
4521 | ||
4522 | default_quit_handler would throw a quit in this case, but if | |
4523 | we're handling an event while we have the terminal, it means | |
4524 | the target is running a background execution command, and | |
4525 | thus when users press Ctrl-C, they're wanting to interrupt | |
4526 | whatever command they were executing in the command line. | |
4527 | E.g.: | |
4528 | ||
4529 | (gdb) c& | |
4530 | (gdb) foo bar whatever<ctrl-c> | |
4531 | ||
4532 | That Ctrl-C should clear the input line, not interrupt event | |
4533 | handling if it happens that the user types Ctrl-C at just the | |
4534 | "wrong" time! | |
4535 | ||
4536 | It's as-if background event handling was handled by a | |
4537 | separate background thread. | |
4538 | ||
4539 | To be clear, the Ctrl-C is not lost -- it will be processed | |
4540 | by the next QUIT call once we're out of fetch_inferior_event | |
4541 | again. */ | |
4542 | } | |
4543 | else | |
4544 | { | |
4545 | if (check_quit_flag ()) | |
4546 | target_pass_ctrlc (); | |
4547 | } | |
4548 | } | |
4549 | ||
1777feb0 | 4550 | /* Asynchronous version of wait_for_inferior. It is called by the |
43ff13b4 | 4551 | event loop whenever a change of state is detected on the file |
1777feb0 MS |
4552 | descriptor corresponding to the target. It can be called more than |
4553 | once to complete a single execution command. In such cases we need | |
4554 | to keep the state in a global variable ECSS. If it is the last time | |
a474d7c2 PA |
4555 | that this function is called for a single execution command, then |
4556 | report to the user that the inferior has stopped, and do the | |
1777feb0 | 4557 | necessary cleanups. */ |
43ff13b4 JM |
4558 | |
4559 | void | |
b1a35af2 | 4560 | fetch_inferior_event () |
43ff13b4 | 4561 | { |
3ec3145c SM |
4562 | INFRUN_SCOPED_DEBUG_ENTER_EXIT; |
4563 | ||
aa563d16 | 4564 | execution_control_state ecs; |
0f641c01 | 4565 | int cmd_done = 0; |
43ff13b4 | 4566 | |
c61db772 PA |
4567 | /* Events are always processed with the main UI as current UI. This |
4568 | way, warnings, debug output, etc. are always consistently sent to | |
4569 | the main console. */ | |
4b6749b9 | 4570 | scoped_restore save_ui = make_scoped_restore (¤t_ui, main_ui); |
c61db772 | 4571 | |
b78b3a29 TBA |
4572 | /* Temporarily disable pagination. Otherwise, the user would be |
4573 | given an option to press 'q' to quit, which would cause an early | |
4574 | exit and could leave GDB in a half-baked state. */ | |
4575 | scoped_restore save_pagination | |
4576 | = make_scoped_restore (&pagination_enabled, false); | |
4577 | ||
0ace6ace PA |
4578 | /* Install a quit handler that does nothing if we have the terminal |
4579 | (meaning the target is running a background execution command), | |
4580 | so that Ctrl-C never interrupts GDB before the event is fully | |
4581 | handled. */ | |
4582 | scoped_restore restore_quit_handler | |
4583 | = make_scoped_restore (&quit_handler, infrun_quit_handler); | |
4584 | ||
141cd158 PA |
4585 | /* Make sure a SIGINT does not interrupt an extension language while |
4586 | we're handling an event. That could interrupt a Python unwinder | |
4587 | or a Python observer or some such. A Ctrl-C should either be | |
4588 | forwarded to the inferior if the inferior has the terminal, or, | |
4589 | if GDB has the terminal, should interrupt the command the user is | |
4590 | typing in the CLI. */ | |
4591 | scoped_disable_cooperative_sigint_handling restore_coop_sigint; | |
4592 | ||
d3d4baed | 4593 | /* End up with readline processing input, if necessary. */ |
d238133d TT |
4594 | { |
4595 | SCOPE_EXIT { reinstall_readline_callback_handler_cleanup (); }; | |
4596 | ||
4597 | /* We're handling a live event, so make sure we're doing live | |
4598 | debugging. If we're looking at traceframes while the target is | |
4599 | running, we're going to need to get back to that mode after | |
4600 | handling the event. */ | |
6b09f134 | 4601 | std::optional<scoped_restore_current_traceframe> maybe_restore_traceframe; |
d238133d TT |
4602 | if (non_stop) |
4603 | { | |
4604 | maybe_restore_traceframe.emplace (); | |
4605 | set_current_traceframe (-1); | |
4606 | } | |
43ff13b4 | 4607 | |
873657b9 PA |
4608 | /* The user/frontend should not notice a thread switch due to |
4609 | internal events. Make sure we revert to the user selected | |
4610 | thread and frame after handling the event and running any | |
4611 | breakpoint commands. */ | |
4612 | scoped_restore_current_thread restore_thread; | |
d238133d TT |
4613 | |
4614 | overlay_cache_invalid = 1; | |
4615 | /* Flush target cache before starting to handle each event. Target | |
4616 | was running and cache could be stale. This is just a heuristic. | |
4617 | Running threads may modify target memory, but we don't get any | |
4618 | event. */ | |
41336620 | 4619 | target_dcache_invalidate (current_program_space->aspace); |
d238133d TT |
4620 | |
4621 | scoped_restore save_exec_dir | |
4622 | = make_scoped_restore (&execution_direction, | |
4623 | target_execution_direction ()); | |
4624 | ||
1192f124 SM |
4625 | /* Allow targets to pause their resumed threads while we handle |
4626 | the event. */ | |
4627 | scoped_disable_commit_resumed disable_commit_resumed ("handling event"); | |
4628 | ||
aa563d16 | 4629 | if (!do_target_wait (&ecs, TARGET_WNOHANG)) |
1192f124 SM |
4630 | { |
4631 | infrun_debug_printf ("do_target_wait returned no event"); | |
4632 | disable_commit_resumed.reset_and_commit (); | |
4633 | return; | |
4634 | } | |
5b6d1e4f | 4635 | |
aa563d16 | 4636 | gdb_assert (ecs.ws.kind () != TARGET_WAITKIND_IGNORE); |
5b6d1e4f | 4637 | |
9145fd43 SM |
4638 | /* Switch to the inferior that generated the event, so we can do |
4639 | target calls. If the event was not associated to a ptid, */ | |
4640 | if (ecs.ptid != null_ptid | |
4641 | && ecs.ptid != minus_one_ptid) | |
4642 | switch_to_inferior_no_thread (find_inferior_ptid (ecs.target, ecs.ptid)); | |
4643 | else | |
4644 | switch_to_target_no_thread (ecs.target); | |
d238133d TT |
4645 | |
4646 | if (debug_infrun) | |
aa563d16 | 4647 | print_target_wait_results (minus_one_ptid, ecs.ptid, ecs.ws); |
d238133d TT |
4648 | |
4649 | /* If an error happens while handling the event, propagate GDB's | |
4650 | knowledge of the executing state to the frontend/user running | |
4651 | state. */ | |
aa563d16 TT |
4652 | ptid_t finish_ptid = !target_is_non_stop_p () ? minus_one_ptid : ecs.ptid; |
4653 | scoped_finish_thread_state finish_state (ecs.target, finish_ptid); | |
d238133d | 4654 | |
979a0d13 | 4655 | /* Get executed before scoped_restore_current_thread above to apply |
d238133d TT |
4656 | still for the thread which has thrown the exception. */ |
4657 | auto defer_bpstat_clear | |
4658 | = make_scope_exit (bpstat_clear_actions); | |
4659 | auto defer_delete_threads | |
4660 | = make_scope_exit (delete_just_stopped_threads_infrun_breakpoints); | |
4661 | ||
b1c0ab20 AB |
4662 | int stop_id = get_stop_id (); |
4663 | ||
d238133d | 4664 | /* Now figure out what to do with the result of the result. */ |
aa563d16 | 4665 | handle_inferior_event (&ecs); |
d238133d | 4666 | |
aa563d16 | 4667 | if (!ecs.wait_some_more) |
d238133d | 4668 | { |
aa563d16 | 4669 | struct inferior *inf = find_inferior_ptid (ecs.target, ecs.ptid); |
758cb810 | 4670 | bool should_stop = true; |
aa563d16 | 4671 | struct thread_info *thr = ecs.event_thread; |
d6b48e9c | 4672 | |
d238133d | 4673 | delete_just_stopped_threads_infrun_breakpoints (); |
f107f563 | 4674 | |
573269a8 LS |
4675 | if (thr != nullptr && thr->thread_fsm () != nullptr) |
4676 | should_stop = thr->thread_fsm ()->should_stop (thr); | |
243a9253 | 4677 | |
d238133d TT |
4678 | if (!should_stop) |
4679 | { | |
aa563d16 | 4680 | keep_going (&ecs); |
d238133d TT |
4681 | } |
4682 | else | |
4683 | { | |
46e3ed7f | 4684 | bool should_notify_stop = true; |
8dd08de7 | 4685 | bool proceeded = false; |
1840d81a | 4686 | |
e0c01ce6 PA |
4687 | stop_all_threads_if_all_stop_mode (); |
4688 | ||
aa563d16 | 4689 | clean_up_just_stopped_threads_fsms (&ecs); |
243a9253 | 4690 | |
b1c0ab20 AB |
4691 | if (stop_id != get_stop_id ()) |
4692 | { | |
4693 | /* If the stop-id has changed then a stop has already been | |
4694 | presented to the user in handle_inferior_event, this is | |
4695 | likely a failed inferior call. As the stop has already | |
4696 | been announced then we should not notify again. | |
4697 | ||
4698 | Also, if the prompt state is not PROMPT_NEEDED then GDB | |
4699 | will not be ready for user input after this function. */ | |
4700 | should_notify_stop = false; | |
4701 | gdb_assert (current_ui->prompt_state == PROMPT_NEEDED); | |
4702 | } | |
4703 | else if (thr != nullptr && thr->thread_fsm () != nullptr) | |
573269a8 LS |
4704 | should_notify_stop |
4705 | = thr->thread_fsm ()->should_notify_stop (); | |
388a7084 | 4706 | |
d238133d TT |
4707 | if (should_notify_stop) |
4708 | { | |
4709 | /* We may not find an inferior if this was a process exit. */ | |
03acd4d8 | 4710 | if (inf == nullptr || inf->control.stop_soon == NO_STOP_QUIETLY) |
d238133d TT |
4711 | proceeded = normal_stop (); |
4712 | } | |
243a9253 | 4713 | |
d238133d TT |
4714 | if (!proceeded) |
4715 | { | |
b1a35af2 | 4716 | inferior_event_handler (INF_EXEC_COMPLETE); |
d238133d TT |
4717 | cmd_done = 1; |
4718 | } | |
873657b9 PA |
4719 | |
4720 | /* If we got a TARGET_WAITKIND_NO_RESUMED event, then the | |
4721 | previously selected thread is gone. We have two | |
4722 | choices - switch to no thread selected, or restore the | |
4723 | previously selected thread (now exited). We chose the | |
4724 | later, just because that's what GDB used to do. After | |
4725 | this, "info threads" says "The current thread <Thread | |
4726 | ID 2> has terminated." instead of "No thread | |
4727 | selected.". */ | |
4728 | if (!non_stop | |
4729 | && cmd_done | |
aa563d16 | 4730 | && ecs.ws.kind () != TARGET_WAITKIND_NO_RESUMED) |
873657b9 | 4731 | restore_thread.dont_restore (); |
d238133d TT |
4732 | } |
4733 | } | |
4f8d22e3 | 4734 | |
d238133d TT |
4735 | defer_delete_threads.release (); |
4736 | defer_bpstat_clear.release (); | |
29f49a6a | 4737 | |
d238133d TT |
4738 | /* No error, don't finish the thread states yet. */ |
4739 | finish_state.release (); | |
731f534f | 4740 | |
1192f124 SM |
4741 | disable_commit_resumed.reset_and_commit (); |
4742 | ||
d238133d TT |
4743 | /* This scope is used to ensure that readline callbacks are |
4744 | reinstalled here. */ | |
4745 | } | |
4f8d22e3 | 4746 | |
152a1749 SM |
4747 | /* Handling this event might have caused some inferiors to become prunable. |
4748 | For example, the exit of an inferior that was automatically added. Try | |
4749 | to get rid of them. Keeping those around slows down things linearly. | |
4750 | ||
4751 | Note that this never removes the current inferior. Therefore, call this | |
4752 | after RESTORE_THREAD went out of scope, in case the event inferior (which was | |
4753 | temporarily made the current inferior) is meant to be deleted. | |
4754 | ||
4755 | Call this before all_uis_check_sync_execution_done, so that notifications about | |
4756 | removed inferiors appear before the prompt. */ | |
4757 | prune_inferiors (); | |
4758 | ||
3b12939d PA |
4759 | /* If a UI was in sync execution mode, and now isn't, restore its |
4760 | prompt (a synchronous execution command has finished, and we're | |
4761 | ready for input). */ | |
4762 | all_uis_check_sync_execution_done (); | |
0f641c01 PA |
4763 | |
4764 | if (cmd_done | |
0f641c01 | 4765 | && exec_done_display_p |
00431a78 PA |
4766 | && (inferior_ptid == null_ptid |
4767 | || inferior_thread ()->state != THREAD_RUNNING)) | |
6cb06a8c | 4768 | gdb_printf (_("completed.\n")); |
43ff13b4 JM |
4769 | } |
4770 | ||
29734269 SM |
4771 | /* See infrun.h. */ |
4772 | ||
edb3359d | 4773 | void |
bd2b40ac | 4774 | set_step_info (thread_info *tp, frame_info_ptr frame, |
29734269 | 4775 | struct symtab_and_line sal) |
edb3359d | 4776 | { |
29734269 SM |
4777 | /* This can be removed once this function no longer implicitly relies on the |
4778 | inferior_ptid value. */ | |
4779 | gdb_assert (inferior_ptid == tp->ptid); | |
edb3359d | 4780 | |
16c381f0 JK |
4781 | tp->control.step_frame_id = get_frame_id (frame); |
4782 | tp->control.step_stack_frame_id = get_stack_frame_id (frame); | |
edb3359d DJ |
4783 | |
4784 | tp->current_symtab = sal.symtab; | |
4785 | tp->current_line = sal.line; | |
c8353d68 AB |
4786 | |
4787 | infrun_debug_printf | |
4788 | ("symtab = %s, line = %d, step_frame_id = %s, step_stack_frame_id = %s", | |
b7e07722 PA |
4789 | tp->current_symtab != nullptr ? tp->current_symtab->filename : "<null>", |
4790 | tp->current_line, | |
c8353d68 AB |
4791 | tp->control.step_frame_id.to_string ().c_str (), |
4792 | tp->control.step_stack_frame_id.to_string ().c_str ()); | |
edb3359d DJ |
4793 | } |
4794 | ||
0d1e5fa7 PA |
4795 | /* Clear context switchable stepping state. */ |
4796 | ||
4797 | void | |
4e1c45ea | 4798 | init_thread_stepping_state (struct thread_info *tss) |
0d1e5fa7 | 4799 | { |
7f5ef605 | 4800 | tss->stepped_breakpoint = 0; |
0d1e5fa7 | 4801 | tss->stepping_over_breakpoint = 0; |
963f9c80 | 4802 | tss->stepping_over_watchpoint = 0; |
0d1e5fa7 | 4803 | tss->step_after_step_resume_breakpoint = 0; |
cd0fc7c3 SS |
4804 | } |
4805 | ||
ab1ddbcf | 4806 | /* See infrun.h. */ |
c32c64b7 | 4807 | |
6efcd9a8 | 4808 | void |
5b6d1e4f | 4809 | set_last_target_status (process_stratum_target *target, ptid_t ptid, |
183be222 | 4810 | const target_waitstatus &status) |
c32c64b7 | 4811 | { |
5b6d1e4f | 4812 | target_last_proc_target = target; |
c32c64b7 DE |
4813 | target_last_wait_ptid = ptid; |
4814 | target_last_waitstatus = status; | |
4815 | } | |
4816 | ||
ab1ddbcf | 4817 | /* See infrun.h. */ |
e02bc4cc DS |
4818 | |
4819 | void | |
5b6d1e4f PA |
4820 | get_last_target_status (process_stratum_target **target, ptid_t *ptid, |
4821 | target_waitstatus *status) | |
e02bc4cc | 4822 | { |
5b6d1e4f PA |
4823 | if (target != nullptr) |
4824 | *target = target_last_proc_target; | |
ab1ddbcf PA |
4825 | if (ptid != nullptr) |
4826 | *ptid = target_last_wait_ptid; | |
4827 | if (status != nullptr) | |
4828 | *status = target_last_waitstatus; | |
e02bc4cc DS |
4829 | } |
4830 | ||
ab1ddbcf PA |
4831 | /* See infrun.h. */ |
4832 | ||
ac264b3b MS |
4833 | void |
4834 | nullify_last_target_wait_ptid (void) | |
4835 | { | |
5b6d1e4f | 4836 | target_last_proc_target = nullptr; |
ac264b3b | 4837 | target_last_wait_ptid = minus_one_ptid; |
ab1ddbcf | 4838 | target_last_waitstatus = {}; |
ac264b3b MS |
4839 | } |
4840 | ||
dcf4fbde | 4841 | /* Switch thread contexts. */ |
dd80620e MS |
4842 | |
4843 | static void | |
00431a78 | 4844 | context_switch (execution_control_state *ecs) |
dd80620e | 4845 | { |
1eb8556f | 4846 | if (ecs->ptid != inferior_ptid |
5b6d1e4f PA |
4847 | && (inferior_ptid == null_ptid |
4848 | || ecs->event_thread != inferior_thread ())) | |
fd48f117 | 4849 | { |
1eb8556f | 4850 | infrun_debug_printf ("Switching context from %s to %s", |
0fab7955 SM |
4851 | inferior_ptid.to_string ().c_str (), |
4852 | ecs->ptid.to_string ().c_str ()); | |
fd48f117 DJ |
4853 | } |
4854 | ||
00431a78 | 4855 | switch_to_thread (ecs->event_thread); |
dd80620e MS |
4856 | } |
4857 | ||
d8dd4d5f PA |
4858 | /* If the target can't tell whether we've hit breakpoints |
4859 | (target_supports_stopped_by_sw_breakpoint), and we got a SIGTRAP, | |
4860 | check whether that could have been caused by a breakpoint. If so, | |
4861 | adjust the PC, per gdbarch_decr_pc_after_break. */ | |
4862 | ||
4fa8626c | 4863 | static void |
d8dd4d5f | 4864 | adjust_pc_after_break (struct thread_info *thread, |
c272a98c | 4865 | const target_waitstatus &ws) |
4fa8626c | 4866 | { |
24a73cce UW |
4867 | struct regcache *regcache; |
4868 | struct gdbarch *gdbarch; | |
118e6252 | 4869 | CORE_ADDR breakpoint_pc, decr_pc; |
4fa8626c | 4870 | |
4fa8626c DJ |
4871 | /* If we've hit a breakpoint, we'll normally be stopped with SIGTRAP. If |
4872 | we aren't, just return. | |
9709f61c DJ |
4873 | |
4874 | We assume that waitkinds other than TARGET_WAITKIND_STOPPED are not | |
b798847d UW |
4875 | affected by gdbarch_decr_pc_after_break. Other waitkinds which are |
4876 | implemented by software breakpoints should be handled through the normal | |
4877 | breakpoint layer. | |
8fb3e588 | 4878 | |
4fa8626c DJ |
4879 | NOTE drow/2004-01-31: On some targets, breakpoints may generate |
4880 | different signals (SIGILL or SIGEMT for instance), but it is less | |
4881 | clear where the PC is pointing afterwards. It may not match | |
b798847d UW |
4882 | gdbarch_decr_pc_after_break. I don't know any specific target that |
4883 | generates these signals at breakpoints (the code has been in GDB since at | |
4884 | least 1992) so I can not guess how to handle them here. | |
8fb3e588 | 4885 | |
e6cf7916 UW |
4886 | In earlier versions of GDB, a target with |
4887 | gdbarch_have_nonsteppable_watchpoint would have the PC after hitting a | |
b798847d UW |
4888 | watchpoint affected by gdbarch_decr_pc_after_break. I haven't found any |
4889 | target with both of these set in GDB history, and it seems unlikely to be | |
4890 | correct, so gdbarch_have_nonsteppable_watchpoint is not checked here. */ | |
4fa8626c | 4891 | |
c272a98c | 4892 | if (ws.kind () != TARGET_WAITKIND_STOPPED) |
4fa8626c DJ |
4893 | return; |
4894 | ||
c272a98c | 4895 | if (ws.sig () != GDB_SIGNAL_TRAP) |
4fa8626c DJ |
4896 | return; |
4897 | ||
4058b839 PA |
4898 | /* In reverse execution, when a breakpoint is hit, the instruction |
4899 | under it has already been de-executed. The reported PC always | |
4900 | points at the breakpoint address, so adjusting it further would | |
4901 | be wrong. E.g., consider this case on a decr_pc_after_break == 1 | |
4902 | architecture: | |
4903 | ||
4904 | B1 0x08000000 : INSN1 | |
4905 | B2 0x08000001 : INSN2 | |
4906 | 0x08000002 : INSN3 | |
4907 | PC -> 0x08000003 : INSN4 | |
4908 | ||
4909 | Say you're stopped at 0x08000003 as above. Reverse continuing | |
4910 | from that point should hit B2 as below. Reading the PC when the | |
4911 | SIGTRAP is reported should read 0x08000001 and INSN2 should have | |
4912 | been de-executed already. | |
4913 | ||
4914 | B1 0x08000000 : INSN1 | |
4915 | B2 PC -> 0x08000001 : INSN2 | |
4916 | 0x08000002 : INSN3 | |
4917 | 0x08000003 : INSN4 | |
4918 | ||
4919 | We can't apply the same logic as for forward execution, because | |
4920 | we would wrongly adjust the PC to 0x08000000, since there's a | |
4921 | breakpoint at PC - 1. We'd then report a hit on B1, although | |
4922 | INSN1 hadn't been de-executed yet. Doing nothing is the correct | |
4923 | behaviour. */ | |
4924 | if (execution_direction == EXEC_REVERSE) | |
4925 | return; | |
4926 | ||
1cf4d951 PA |
4927 | /* If the target can tell whether the thread hit a SW breakpoint, |
4928 | trust it. Targets that can tell also adjust the PC | |
4929 | themselves. */ | |
4930 | if (target_supports_stopped_by_sw_breakpoint ()) | |
4931 | return; | |
4932 | ||
4933 | /* Note that relying on whether a breakpoint is planted in memory to | |
4934 | determine this can fail. E.g,. the breakpoint could have been | |
4935 | removed since. Or the thread could have been told to step an | |
4936 | instruction the size of a breakpoint instruction, and only | |
4937 | _after_ was a breakpoint inserted at its address. */ | |
4938 | ||
24a73cce UW |
4939 | /* If this target does not decrement the PC after breakpoints, then |
4940 | we have nothing to do. */ | |
00431a78 | 4941 | regcache = get_thread_regcache (thread); |
ac7936df | 4942 | gdbarch = regcache->arch (); |
118e6252 | 4943 | |
527a273a | 4944 | decr_pc = gdbarch_decr_pc_after_break (gdbarch); |
118e6252 | 4945 | if (decr_pc == 0) |
24a73cce UW |
4946 | return; |
4947 | ||
f9582a22 | 4948 | const address_space *aspace = thread->inf->aspace.get (); |
6c95b8df | 4949 | |
8aad930b AC |
4950 | /* Find the location where (if we've hit a breakpoint) the |
4951 | breakpoint would be. */ | |
118e6252 | 4952 | breakpoint_pc = regcache_read_pc (regcache) - decr_pc; |
8aad930b | 4953 | |
1cf4d951 PA |
4954 | /* If the target can't tell whether a software breakpoint triggered, |
4955 | fallback to figuring it out based on breakpoints we think were | |
4956 | inserted in the target, and on whether the thread was stepped or | |
4957 | continued. */ | |
4958 | ||
1c5cfe86 PA |
4959 | /* Check whether there actually is a software breakpoint inserted at |
4960 | that location. | |
4961 | ||
4962 | If in non-stop mode, a race condition is possible where we've | |
4963 | removed a breakpoint, but stop events for that breakpoint were | |
4964 | already queued and arrive later. To suppress those spurious | |
4965 | SIGTRAPs, we keep a list of such breakpoint locations for a bit, | |
1cf4d951 PA |
4966 | and retire them after a number of stop events are reported. Note |
4967 | this is an heuristic and can thus get confused. The real fix is | |
4968 | to get the "stopped by SW BP and needs adjustment" info out of | |
4969 | the target/kernel (and thus never reach here; see above). */ | |
6c95b8df | 4970 | if (software_breakpoint_inserted_here_p (aspace, breakpoint_pc) |
fbea99ea PA |
4971 | || (target_is_non_stop_p () |
4972 | && moribund_breakpoint_here_p (aspace, breakpoint_pc))) | |
8aad930b | 4973 | { |
6b09f134 | 4974 | std::optional<scoped_restore_tmpl<int>> restore_operation_disable; |
abbb1732 | 4975 | |
8213266a | 4976 | if (record_full_is_used ()) |
07036511 TT |
4977 | restore_operation_disable.emplace |
4978 | (record_full_gdb_operation_disable_set ()); | |
96429cc8 | 4979 | |
1c0fdd0e UW |
4980 | /* When using hardware single-step, a SIGTRAP is reported for both |
4981 | a completed single-step and a software breakpoint. Need to | |
4982 | differentiate between the two, as the latter needs adjusting | |
4983 | but the former does not. | |
4984 | ||
4985 | The SIGTRAP can be due to a completed hardware single-step only if | |
4986 | - we didn't insert software single-step breakpoints | |
1c0fdd0e UW |
4987 | - this thread is currently being stepped |
4988 | ||
4989 | If any of these events did not occur, we must have stopped due | |
4990 | to hitting a software breakpoint, and have to back up to the | |
4991 | breakpoint address. | |
4992 | ||
4993 | As a special case, we could have hardware single-stepped a | |
4994 | software breakpoint. In this case (prev_pc == breakpoint_pc), | |
4995 | we also need to back up to the breakpoint address. */ | |
4996 | ||
d8dd4d5f PA |
4997 | if (thread_has_single_step_breakpoints_set (thread) |
4998 | || !currently_stepping (thread) | |
4999 | || (thread->stepped_breakpoint | |
5000 | && thread->prev_pc == breakpoint_pc)) | |
515630c5 | 5001 | regcache_write_pc (regcache, breakpoint_pc); |
8aad930b | 5002 | } |
4fa8626c DJ |
5003 | } |
5004 | ||
c4464ade | 5005 | static bool |
bd2b40ac | 5006 | stepped_in_from (frame_info_ptr frame, struct frame_id step_frame_id) |
edb3359d DJ |
5007 | { |
5008 | for (frame = get_prev_frame (frame); | |
03acd4d8 | 5009 | frame != nullptr; |
edb3359d DJ |
5010 | frame = get_prev_frame (frame)) |
5011 | { | |
a0cbd650 | 5012 | if (get_frame_id (frame) == step_frame_id) |
c4464ade SM |
5013 | return true; |
5014 | ||
edb3359d DJ |
5015 | if (get_frame_type (frame) != INLINE_FRAME) |
5016 | break; | |
5017 | } | |
5018 | ||
c4464ade | 5019 | return false; |
edb3359d DJ |
5020 | } |
5021 | ||
4a4c04f1 BE |
5022 | /* Look for an inline frame that is marked for skip. |
5023 | If PREV_FRAME is TRUE start at the previous frame, | |
5024 | otherwise start at the current frame. Stop at the | |
5025 | first non-inline frame, or at the frame where the | |
5026 | step started. */ | |
5027 | ||
5028 | static bool | |
5029 | inline_frame_is_marked_for_skip (bool prev_frame, struct thread_info *tp) | |
5030 | { | |
bd2b40ac | 5031 | frame_info_ptr frame = get_current_frame (); |
4a4c04f1 BE |
5032 | |
5033 | if (prev_frame) | |
5034 | frame = get_prev_frame (frame); | |
5035 | ||
03acd4d8 | 5036 | for (; frame != nullptr; frame = get_prev_frame (frame)) |
4a4c04f1 | 5037 | { |
03acd4d8 | 5038 | const char *fn = nullptr; |
4a4c04f1 BE |
5039 | symtab_and_line sal; |
5040 | struct symbol *sym; | |
5041 | ||
a0cbd650 | 5042 | if (get_frame_id (frame) == tp->control.step_frame_id) |
4a4c04f1 BE |
5043 | break; |
5044 | if (get_frame_type (frame) != INLINE_FRAME) | |
5045 | break; | |
5046 | ||
5047 | sal = find_frame_sal (frame); | |
5048 | sym = get_frame_function (frame); | |
5049 | ||
03acd4d8 | 5050 | if (sym != nullptr) |
4a4c04f1 BE |
5051 | fn = sym->print_name (); |
5052 | ||
5053 | if (sal.line != 0 | |
5054 | && function_name_is_marked_for_skip (fn, sal)) | |
5055 | return true; | |
5056 | } | |
5057 | ||
5058 | return false; | |
5059 | } | |
5060 | ||
c65d6b55 PA |
5061 | /* If the event thread has the stop requested flag set, pretend it |
5062 | stopped for a GDB_SIGNAL_0 (i.e., as if it stopped due to | |
5063 | target_stop). */ | |
5064 | ||
5065 | static bool | |
5066 | handle_stop_requested (struct execution_control_state *ecs) | |
5067 | { | |
5068 | if (ecs->event_thread->stop_requested) | |
5069 | { | |
183be222 | 5070 | ecs->ws.set_stopped (GDB_SIGNAL_0); |
c65d6b55 PA |
5071 | handle_signal_stop (ecs); |
5072 | return true; | |
5073 | } | |
5074 | return false; | |
5075 | } | |
5076 | ||
a96d9b2e | 5077 | /* Auxiliary function that handles syscall entry/return events. |
c4464ade SM |
5078 | It returns true if the inferior should keep going (and GDB |
5079 | should ignore the event), or false if the event deserves to be | |
a96d9b2e | 5080 | processed. */ |
ca2163eb | 5081 | |
c4464ade | 5082 | static bool |
ca2163eb | 5083 | handle_syscall_event (struct execution_control_state *ecs) |
a96d9b2e | 5084 | { |
ca2163eb | 5085 | struct regcache *regcache; |
ca2163eb PA |
5086 | int syscall_number; |
5087 | ||
00431a78 | 5088 | context_switch (ecs); |
ca2163eb | 5089 | |
00431a78 | 5090 | regcache = get_thread_regcache (ecs->event_thread); |
183be222 | 5091 | syscall_number = ecs->ws.syscall_number (); |
1edb66d8 | 5092 | ecs->event_thread->set_stop_pc (regcache_read_pc (regcache)); |
ca2163eb | 5093 | |
f087eb27 | 5094 | if (catch_syscall_enabled () |
9fe3819e | 5095 | && catching_syscall_number (syscall_number)) |
a96d9b2e | 5096 | { |
1eb8556f | 5097 | infrun_debug_printf ("syscall number=%d", syscall_number); |
a96d9b2e | 5098 | |
16c381f0 | 5099 | ecs->event_thread->control.stop_bpstat |
f9582a22 | 5100 | = bpstat_stop_status_nowatch (ecs->event_thread->inf->aspace.get (), |
d37e0847 PA |
5101 | ecs->event_thread->stop_pc (), |
5102 | ecs->event_thread, ecs->ws); | |
ab04a2af | 5103 | |
c65d6b55 | 5104 | if (handle_stop_requested (ecs)) |
c4464ade | 5105 | return false; |
c65d6b55 | 5106 | |
ce12b012 | 5107 | if (bpstat_causes_stop (ecs->event_thread->control.stop_bpstat)) |
ca2163eb PA |
5108 | { |
5109 | /* Catchpoint hit. */ | |
c4464ade | 5110 | return false; |
ca2163eb | 5111 | } |
a96d9b2e | 5112 | } |
ca2163eb | 5113 | |
c65d6b55 | 5114 | if (handle_stop_requested (ecs)) |
c4464ade | 5115 | return false; |
c65d6b55 | 5116 | |
ca2163eb | 5117 | /* If no catchpoint triggered for this, then keep going. */ |
ca2163eb | 5118 | keep_going (ecs); |
c4464ade SM |
5119 | |
5120 | return true; | |
a96d9b2e SDJ |
5121 | } |
5122 | ||
7e324e48 GB |
5123 | /* Lazily fill in the execution_control_state's stop_func_* fields. */ |
5124 | ||
5125 | static void | |
5126 | fill_in_stop_func (struct gdbarch *gdbarch, | |
5127 | struct execution_control_state *ecs) | |
5128 | { | |
5129 | if (!ecs->stop_func_filled_in) | |
5130 | { | |
98a617f8 | 5131 | const block *block; |
fe830662 | 5132 | const general_symbol_info *gsi; |
98a617f8 | 5133 | |
7e324e48 GB |
5134 | /* Don't care about return value; stop_func_start and stop_func_name |
5135 | will both be 0 if it doesn't work. */ | |
1edb66d8 | 5136 | find_pc_partial_function_sym (ecs->event_thread->stop_pc (), |
fe830662 TT |
5137 | &gsi, |
5138 | &ecs->stop_func_start, | |
5139 | &ecs->stop_func_end, | |
5140 | &block); | |
5141 | ecs->stop_func_name = gsi == nullptr ? nullptr : gsi->print_name (); | |
98a617f8 KB |
5142 | |
5143 | /* The call to find_pc_partial_function, above, will set | |
5144 | stop_func_start and stop_func_end to the start and end | |
5145 | of the range containing the stop pc. If this range | |
5146 | contains the entry pc for the block (which is always the | |
5147 | case for contiguous blocks), advance stop_func_start past | |
5148 | the function's start offset and entrypoint. Note that | |
5149 | stop_func_start is NOT advanced when in a range of a | |
5150 | non-contiguous block that does not contain the entry pc. */ | |
5151 | if (block != nullptr | |
6395b628 SM |
5152 | && ecs->stop_func_start <= block->entry_pc () |
5153 | && block->entry_pc () < ecs->stop_func_end) | |
98a617f8 KB |
5154 | { |
5155 | ecs->stop_func_start | |
5156 | += gdbarch_deprecated_function_start_offset (gdbarch); | |
5157 | ||
2a8339b7 CL |
5158 | /* PowerPC functions have a Local Entry Point (LEP) and a Global |
5159 | Entry Point (GEP). There is only one Entry Point (GEP = LEP) for | |
5160 | other architectures. */ | |
5161 | ecs->stop_func_alt_start = ecs->stop_func_start; | |
5162 | ||
98a617f8 KB |
5163 | if (gdbarch_skip_entrypoint_p (gdbarch)) |
5164 | ecs->stop_func_start | |
5165 | = gdbarch_skip_entrypoint (gdbarch, ecs->stop_func_start); | |
5166 | } | |
591a12a1 | 5167 | |
7e324e48 GB |
5168 | ecs->stop_func_filled_in = 1; |
5169 | } | |
5170 | } | |
5171 | ||
4f5d7f63 | 5172 | |
00431a78 | 5173 | /* Return the STOP_SOON field of the inferior pointed at by ECS. */ |
4f5d7f63 PA |
5174 | |
5175 | static enum stop_kind | |
00431a78 | 5176 | get_inferior_stop_soon (execution_control_state *ecs) |
4f5d7f63 | 5177 | { |
5b6d1e4f | 5178 | struct inferior *inf = find_inferior_ptid (ecs->target, ecs->ptid); |
4f5d7f63 | 5179 | |
03acd4d8 | 5180 | gdb_assert (inf != nullptr); |
4f5d7f63 PA |
5181 | return inf->control.stop_soon; |
5182 | } | |
5183 | ||
5b6d1e4f PA |
5184 | /* Poll for one event out of the current target. Store the resulting |
5185 | waitstatus in WS, and return the event ptid. Does not block. */ | |
372316f1 PA |
5186 | |
5187 | static ptid_t | |
5b6d1e4f | 5188 | poll_one_curr_target (struct target_waitstatus *ws) |
372316f1 PA |
5189 | { |
5190 | ptid_t event_ptid; | |
372316f1 PA |
5191 | |
5192 | overlay_cache_invalid = 1; | |
5193 | ||
5194 | /* Flush target cache before starting to handle each event. | |
5195 | Target was running and cache could be stale. This is just a | |
5196 | heuristic. Running threads may modify target memory, but we | |
5197 | don't get any event. */ | |
41336620 | 5198 | target_dcache_invalidate (current_program_space->aspace); |
372316f1 | 5199 | |
fb85cece | 5200 | event_ptid = target_wait (minus_one_ptid, ws, TARGET_WNOHANG); |
372316f1 PA |
5201 | |
5202 | if (debug_infrun) | |
c272a98c | 5203 | print_target_wait_results (minus_one_ptid, event_ptid, *ws); |
372316f1 PA |
5204 | |
5205 | return event_ptid; | |
5206 | } | |
5207 | ||
5b6d1e4f PA |
5208 | /* Wait for one event out of any target. */ |
5209 | ||
5210 | static wait_one_event | |
5211 | wait_one () | |
5212 | { | |
5213 | while (1) | |
5214 | { | |
5215 | for (inferior *inf : all_inferiors ()) | |
5216 | { | |
5217 | process_stratum_target *target = inf->process_target (); | |
03acd4d8 | 5218 | if (target == nullptr |
5b6d1e4f PA |
5219 | || !target->is_async_p () |
5220 | || !target->threads_executing) | |
5221 | continue; | |
5222 | ||
5223 | switch_to_inferior_no_thread (inf); | |
5224 | ||
5225 | wait_one_event event; | |
5226 | event.target = target; | |
5227 | event.ptid = poll_one_curr_target (&event.ws); | |
5228 | ||
183be222 | 5229 | if (event.ws.kind () == TARGET_WAITKIND_NO_RESUMED) |
5b6d1e4f PA |
5230 | { |
5231 | /* If nothing is resumed, remove the target from the | |
5232 | event loop. */ | |
4a570176 | 5233 | target_async (false); |
5b6d1e4f | 5234 | } |
183be222 | 5235 | else if (event.ws.kind () != TARGET_WAITKIND_IGNORE) |
5b6d1e4f PA |
5236 | return event; |
5237 | } | |
5238 | ||
5239 | /* Block waiting for some event. */ | |
5240 | ||
5241 | fd_set readfds; | |
5242 | int nfds = 0; | |
5243 | ||
5244 | FD_ZERO (&readfds); | |
5245 | ||
5246 | for (inferior *inf : all_inferiors ()) | |
5247 | { | |
5248 | process_stratum_target *target = inf->process_target (); | |
03acd4d8 | 5249 | if (target == nullptr |
5b6d1e4f PA |
5250 | || !target->is_async_p () |
5251 | || !target->threads_executing) | |
5252 | continue; | |
5253 | ||
5254 | int fd = target->async_wait_fd (); | |
5255 | FD_SET (fd, &readfds); | |
5256 | if (nfds <= fd) | |
5257 | nfds = fd + 1; | |
5258 | } | |
5259 | ||
5260 | if (nfds == 0) | |
5261 | { | |
5262 | /* No waitable targets left. All must be stopped. */ | |
d828dbed PA |
5263 | infrun_debug_printf ("no waitable targets left"); |
5264 | ||
183be222 SM |
5265 | target_waitstatus ws; |
5266 | ws.set_no_resumed (); | |
03acd4d8 | 5267 | return {nullptr, minus_one_ptid, std::move (ws)}; |
5b6d1e4f PA |
5268 | } |
5269 | ||
5270 | QUIT; | |
5271 | ||
03acd4d8 | 5272 | int numfds = interruptible_select (nfds, &readfds, 0, nullptr, 0); |
5b6d1e4f PA |
5273 | if (numfds < 0) |
5274 | { | |
5275 | if (errno == EINTR) | |
5276 | continue; | |
5277 | else | |
5278 | perror_with_name ("interruptible_select"); | |
5279 | } | |
5280 | } | |
5281 | } | |
5282 | ||
372316f1 PA |
5283 | /* Save the thread's event and stop reason to process it later. */ |
5284 | ||
5285 | static void | |
c272a98c | 5286 | save_waitstatus (struct thread_info *tp, const target_waitstatus &ws) |
372316f1 | 5287 | { |
96bbe3ef | 5288 | infrun_debug_printf ("saving status %s for %s", |
c272a98c | 5289 | ws.to_string ().c_str (), |
96bbe3ef | 5290 | tp->ptid.to_string ().c_str ()); |
372316f1 PA |
5291 | |
5292 | /* Record for later. */ | |
c272a98c | 5293 | tp->set_pending_waitstatus (ws); |
372316f1 | 5294 | |
c272a98c SM |
5295 | if (ws.kind () == TARGET_WAITKIND_STOPPED |
5296 | && ws.sig () == GDB_SIGNAL_TRAP) | |
372316f1 | 5297 | { |
89ba430c | 5298 | struct regcache *regcache = get_thread_regcache (tp); |
f9582a22 | 5299 | const address_space *aspace = tp->inf->aspace.get (); |
372316f1 PA |
5300 | CORE_ADDR pc = regcache_read_pc (regcache); |
5301 | ||
c272a98c | 5302 | adjust_pc_after_break (tp, tp->pending_waitstatus ()); |
372316f1 | 5303 | |
18493a00 PA |
5304 | scoped_restore_current_thread restore_thread; |
5305 | switch_to_thread (tp); | |
5306 | ||
5307 | if (target_stopped_by_watchpoint ()) | |
1edb66d8 | 5308 | tp->set_stop_reason (TARGET_STOPPED_BY_WATCHPOINT); |
372316f1 | 5309 | else if (target_supports_stopped_by_sw_breakpoint () |
18493a00 | 5310 | && target_stopped_by_sw_breakpoint ()) |
1edb66d8 | 5311 | tp->set_stop_reason (TARGET_STOPPED_BY_SW_BREAKPOINT); |
372316f1 | 5312 | else if (target_supports_stopped_by_hw_breakpoint () |
18493a00 | 5313 | && target_stopped_by_hw_breakpoint ()) |
1edb66d8 | 5314 | tp->set_stop_reason (TARGET_STOPPED_BY_HW_BREAKPOINT); |
372316f1 | 5315 | else if (!target_supports_stopped_by_hw_breakpoint () |
1edb66d8 SM |
5316 | && hardware_breakpoint_inserted_here_p (aspace, pc)) |
5317 | tp->set_stop_reason (TARGET_STOPPED_BY_HW_BREAKPOINT); | |
372316f1 | 5318 | else if (!target_supports_stopped_by_sw_breakpoint () |
1edb66d8 SM |
5319 | && software_breakpoint_inserted_here_p (aspace, pc)) |
5320 | tp->set_stop_reason (TARGET_STOPPED_BY_SW_BREAKPOINT); | |
372316f1 PA |
5321 | else if (!thread_has_single_step_breakpoints_set (tp) |
5322 | && currently_stepping (tp)) | |
1edb66d8 | 5323 | tp->set_stop_reason (TARGET_STOPPED_BY_SINGLE_STEP); |
372316f1 PA |
5324 | } |
5325 | } | |
5326 | ||
293b3ebc TBA |
5327 | /* Mark the non-executing threads accordingly. In all-stop, all |
5328 | threads of all processes are stopped when we get any event | |
5329 | reported. In non-stop mode, only the event thread stops. */ | |
5330 | ||
5331 | static void | |
5332 | mark_non_executing_threads (process_stratum_target *target, | |
5333 | ptid_t event_ptid, | |
183be222 | 5334 | const target_waitstatus &ws) |
293b3ebc TBA |
5335 | { |
5336 | ptid_t mark_ptid; | |
5337 | ||
5338 | if (!target_is_non_stop_p ()) | |
5339 | mark_ptid = minus_one_ptid; | |
183be222 SM |
5340 | else if (ws.kind () == TARGET_WAITKIND_SIGNALLED |
5341 | || ws.kind () == TARGET_WAITKIND_EXITED) | |
293b3ebc TBA |
5342 | { |
5343 | /* If we're handling a process exit in non-stop mode, even | |
5344 | though threads haven't been deleted yet, one would think | |
5345 | that there is nothing to do, as threads of the dead process | |
5346 | will be soon deleted, and threads of any other process were | |
5347 | left running. However, on some targets, threads survive a | |
5348 | process exit event. E.g., for the "checkpoint" command, | |
5349 | when the current checkpoint/fork exits, linux-fork.c | |
5350 | automatically switches to another fork from within | |
5351 | target_mourn_inferior, by associating the same | |
5352 | inferior/thread to another fork. We haven't mourned yet at | |
5353 | this point, but we must mark any threads left in the | |
5354 | process as not-executing so that finish_thread_state marks | |
5355 | them stopped (in the user's perspective) if/when we present | |
5356 | the stop to the user. */ | |
5357 | mark_ptid = ptid_t (event_ptid.pid ()); | |
5358 | } | |
5359 | else | |
5360 | mark_ptid = event_ptid; | |
5361 | ||
5362 | set_executing (target, mark_ptid, false); | |
5363 | ||
5364 | /* Likewise the resumed flag. */ | |
5365 | set_resumed (target, mark_ptid, false); | |
5366 | } | |
5367 | ||
d758e62c PA |
5368 | /* Handle one event after stopping threads. If the eventing thread |
5369 | reports back any interesting event, we leave it pending. If the | |
5370 | eventing thread was in the middle of a displaced step, we | |
8ff53139 PA |
5371 | cancel/finish it, and unless the thread's inferior is being |
5372 | detached, put the thread back in the step-over chain. Returns true | |
5373 | if there are no resumed threads left in the target (thus there's no | |
5374 | point in waiting further), false otherwise. */ | |
d758e62c PA |
5375 | |
5376 | static bool | |
5377 | handle_one (const wait_one_event &event) | |
5378 | { | |
5379 | infrun_debug_printf | |
7dca2ea7 | 5380 | ("%s %s", event.ws.to_string ().c_str (), |
0fab7955 | 5381 | event.ptid.to_string ().c_str ()); |
d758e62c | 5382 | |
183be222 | 5383 | if (event.ws.kind () == TARGET_WAITKIND_NO_RESUMED) |
d758e62c PA |
5384 | { |
5385 | /* All resumed threads exited. */ | |
5386 | return true; | |
5387 | } | |
183be222 SM |
5388 | else if (event.ws.kind () == TARGET_WAITKIND_THREAD_EXITED |
5389 | || event.ws.kind () == TARGET_WAITKIND_EXITED | |
5390 | || event.ws.kind () == TARGET_WAITKIND_SIGNALLED) | |
d758e62c PA |
5391 | { |
5392 | /* One thread/process exited/signalled. */ | |
5393 | ||
5394 | thread_info *t = nullptr; | |
5395 | ||
5396 | /* The target may have reported just a pid. If so, try | |
5397 | the first non-exited thread. */ | |
5398 | if (event.ptid.is_pid ()) | |
5399 | { | |
5400 | int pid = event.ptid.pid (); | |
5401 | inferior *inf = find_inferior_pid (event.target, pid); | |
5402 | for (thread_info *tp : inf->non_exited_threads ()) | |
5403 | { | |
5404 | t = tp; | |
5405 | break; | |
5406 | } | |
5407 | ||
5408 | /* If there is no available thread, the event would | |
5409 | have to be appended to a per-inferior event list, | |
5410 | which does not exist (and if it did, we'd have | |
5411 | to adjust run control command to be able to | |
5412 | resume such an inferior). We assert here instead | |
5413 | of going into an infinite loop. */ | |
5414 | gdb_assert (t != nullptr); | |
5415 | ||
5416 | infrun_debug_printf | |
0fab7955 | 5417 | ("using %s", t->ptid.to_string ().c_str ()); |
d758e62c PA |
5418 | } |
5419 | else | |
5420 | { | |
9213a6d7 | 5421 | t = event.target->find_thread (event.ptid); |
d758e62c PA |
5422 | /* Check if this is the first time we see this thread. |
5423 | Don't bother adding if it individually exited. */ | |
5424 | if (t == nullptr | |
183be222 | 5425 | && event.ws.kind () != TARGET_WAITKIND_THREAD_EXITED) |
d758e62c PA |
5426 | t = add_thread (event.target, event.ptid); |
5427 | } | |
5428 | ||
5429 | if (t != nullptr) | |
5430 | { | |
5431 | /* Set the threads as non-executing to avoid | |
5432 | another stop attempt on them. */ | |
5433 | switch_to_thread_no_regs (t); | |
5434 | mark_non_executing_threads (event.target, event.ptid, | |
5435 | event.ws); | |
c272a98c | 5436 | save_waitstatus (t, event.ws); |
d758e62c | 5437 | t->stop_requested = false; |
21d48304 PA |
5438 | |
5439 | if (event.ws.kind () == TARGET_WAITKIND_THREAD_EXITED) | |
5440 | { | |
5441 | if (displaced_step_finish (t, event.ws) | |
5442 | != DISPLACED_STEP_FINISH_STATUS_OK) | |
5443 | { | |
5444 | gdb_assert_not_reached ("displaced_step_finish on " | |
5445 | "exited thread failed"); | |
5446 | } | |
5447 | } | |
d758e62c PA |
5448 | } |
5449 | } | |
5450 | else | |
5451 | { | |
9213a6d7 | 5452 | thread_info *t = event.target->find_thread (event.ptid); |
03acd4d8 | 5453 | if (t == nullptr) |
d758e62c PA |
5454 | t = add_thread (event.target, event.ptid); |
5455 | ||
5456 | t->stop_requested = 0; | |
611841bb | 5457 | t->set_executing (false); |
7846f3aa | 5458 | t->set_resumed (false); |
d758e62c PA |
5459 | t->control.may_range_step = 0; |
5460 | ||
5461 | /* This may be the first time we see the inferior report | |
5462 | a stop. */ | |
3db13541 | 5463 | if (t->inf->needs_setup) |
d758e62c PA |
5464 | { |
5465 | switch_to_thread_no_regs (t); | |
5466 | setup_inferior (0); | |
5467 | } | |
5468 | ||
183be222 SM |
5469 | if (event.ws.kind () == TARGET_WAITKIND_STOPPED |
5470 | && event.ws.sig () == GDB_SIGNAL_0) | |
d758e62c PA |
5471 | { |
5472 | /* We caught the event that we intended to catch, so | |
1edb66d8 | 5473 | there's no event to save as pending. */ |
d758e62c | 5474 | |
58c01087 | 5475 | if (displaced_step_finish (t, event.ws) |
d758e62c PA |
5476 | == DISPLACED_STEP_FINISH_STATUS_NOT_EXECUTED) |
5477 | { | |
5478 | /* Add it back to the step-over queue. */ | |
5479 | infrun_debug_printf | |
5480 | ("displaced-step of %s canceled", | |
0fab7955 | 5481 | t->ptid.to_string ().c_str ()); |
d758e62c PA |
5482 | |
5483 | t->control.trap_expected = 0; | |
8ff53139 PA |
5484 | if (!t->inf->detaching) |
5485 | global_thread_step_over_chain_enqueue (t); | |
d758e62c PA |
5486 | } |
5487 | } | |
5488 | else | |
5489 | { | |
d758e62c PA |
5490 | struct regcache *regcache; |
5491 | ||
5492 | infrun_debug_printf | |
96bbe3ef | 5493 | ("target_wait %s, saving status for %s", |
7dca2ea7 | 5494 | event.ws.to_string ().c_str (), |
96bbe3ef | 5495 | t->ptid.to_string ().c_str ()); |
d758e62c PA |
5496 | |
5497 | /* Record for later. */ | |
c272a98c | 5498 | save_waitstatus (t, event.ws); |
d758e62c | 5499 | |
58c01087 | 5500 | if (displaced_step_finish (t, event.ws) |
d758e62c PA |
5501 | == DISPLACED_STEP_FINISH_STATUS_NOT_EXECUTED) |
5502 | { | |
5503 | /* Add it back to the step-over queue. */ | |
5504 | t->control.trap_expected = 0; | |
8ff53139 PA |
5505 | if (!t->inf->detaching) |
5506 | global_thread_step_over_chain_enqueue (t); | |
d758e62c PA |
5507 | } |
5508 | ||
5509 | regcache = get_thread_regcache (t); | |
1edb66d8 | 5510 | t->set_stop_pc (regcache_read_pc (regcache)); |
d758e62c PA |
5511 | |
5512 | infrun_debug_printf ("saved stop_pc=%s for %s " | |
5513 | "(currently_stepping=%d)", | |
99d9c3b9 SM |
5514 | paddress (current_inferior ()->arch (), |
5515 | t->stop_pc ()), | |
0fab7955 | 5516 | t->ptid.to_string ().c_str (), |
d758e62c PA |
5517 | currently_stepping (t)); |
5518 | } | |
5519 | } | |
5520 | ||
5521 | return false; | |
5522 | } | |
5523 | ||
d828dbed PA |
5524 | /* Helper for stop_all_threads. wait_one waits for events until it |
5525 | sees a TARGET_WAITKIND_NO_RESUMED event. When it sees one, it | |
5526 | disables target_async for the target to stop waiting for events | |
5527 | from it. TARGET_WAITKIND_NO_RESUMED can be delayed though, | |
5528 | consider, debugging against gdbserver: | |
5529 | ||
5530 | #1 - Threads 1-5 are running, and thread 1 hits a breakpoint. | |
5531 | ||
5532 | #2 - gdb processes the breakpoint hit for thread 1, stops all | |
5533 | threads, and steps thread 1 over the breakpoint. while | |
5534 | stopping threads, some other threads reported interesting | |
5535 | events, which were left pending in the thread's objects | |
5536 | (infrun's queue). | |
5537 | ||
5538 | #2 - Thread 1 exits (it stepped an exit syscall), and gdbserver | |
5539 | reports the thread exit for thread 1. The event ends up in | |
5540 | remote's stop reply queue. | |
5541 | ||
5542 | #3 - That was the last resumed thread, so gdbserver reports | |
5543 | no-resumed, and that event also ends up in remote's stop | |
5544 | reply queue, queued after the thread exit from #2. | |
5545 | ||
5546 | #4 - gdb processes the thread exit event, which finishes the | |
5547 | step-over, and so gdb restarts all threads (threads with | |
5548 | pending events are left marked resumed, but aren't set | |
5549 | executing). The no-resumed event is still left pending in | |
5550 | the remote stop reply queue. | |
5551 | ||
5552 | #5 - Since there are now resumed threads with pending breakpoint | |
5553 | hits, gdb picks one at random to process next. | |
5554 | ||
5555 | #5 - gdb picks the breakpoint hit for thread 2 this time, and that | |
5556 | breakpoint also needs to be stepped over, so gdb stops all | |
5557 | threads again. | |
5558 | ||
5559 | #6 - stop_all_threads counts number of expected stops and calls | |
5560 | wait_one once for each. | |
5561 | ||
5562 | #7 - The first wait_one call collects the no-resumed event from #3 | |
5563 | above. | |
5564 | ||
5565 | #9 - Seeing the no-resumed event, wait_one disables target async | |
5566 | for the remote target, to stop waiting for events from it. | |
5567 | wait_one from here on always return no-resumed directly | |
5568 | without reaching the target. | |
5569 | ||
5570 | #10 - stop_all_threads still hasn't seen all the stops it expects, | |
5571 | so it does another pass. | |
5572 | ||
5573 | #11 - Since the remote target is not async (disabled in #9), | |
5574 | wait_one doesn't wait on it, so it won't see the expected | |
5575 | stops, and instead returns no-resumed directly. | |
5576 | ||
5577 | #12 - stop_all_threads still haven't seen all the stops, so it | |
5578 | does another pass. goto #11, looping forever. | |
5579 | ||
5580 | To handle this, we explicitly (re-)enable target async on all | |
5581 | targets that can async every time stop_all_threads goes wait for | |
5582 | the expected stops. */ | |
5583 | ||
5584 | static void | |
5585 | reenable_target_async () | |
5586 | { | |
5587 | for (inferior *inf : all_inferiors ()) | |
5588 | { | |
5589 | process_stratum_target *target = inf->process_target (); | |
5590 | if (target != nullptr | |
5591 | && target->threads_executing | |
5592 | && target->can_async_p () | |
5593 | && !target->is_async_p ()) | |
5594 | { | |
5595 | switch_to_inferior_no_thread (inf); | |
5596 | target_async (1); | |
5597 | } | |
5598 | } | |
5599 | } | |
5600 | ||
6efcd9a8 | 5601 | /* See infrun.h. */ |
372316f1 | 5602 | |
6efcd9a8 | 5603 | void |
148cf134 | 5604 | stop_all_threads (const char *reason, inferior *inf) |
372316f1 PA |
5605 | { |
5606 | /* We may need multiple passes to discover all threads. */ | |
5607 | int pass; | |
5608 | int iterations = 0; | |
372316f1 | 5609 | |
53cccef1 | 5610 | gdb_assert (exists_non_stop_target ()); |
372316f1 | 5611 | |
148cf134 SM |
5612 | INFRUN_SCOPED_DEBUG_START_END ("reason=%s, inf=%d", reason, |
5613 | inf != nullptr ? inf->num : -1); | |
372316f1 | 5614 | |
1f9d9e32 AB |
5615 | infrun_debug_show_threads ("non-exited threads", |
5616 | all_non_exited_threads ()); | |
5617 | ||
00431a78 | 5618 | scoped_restore_current_thread restore_thread; |
372316f1 | 5619 | |
148cf134 | 5620 | /* Enable thread events on relevant targets. */ |
6ad82919 TBA |
5621 | for (auto *target : all_non_exited_process_targets ()) |
5622 | { | |
148cf134 SM |
5623 | if (inf != nullptr && inf->process_target () != target) |
5624 | continue; | |
5625 | ||
6ad82919 TBA |
5626 | switch_to_target_no_thread (target); |
5627 | target_thread_events (true); | |
5628 | } | |
5629 | ||
5630 | SCOPE_EXIT | |
5631 | { | |
148cf134 | 5632 | /* Disable thread events on relevant targets. */ |
6ad82919 TBA |
5633 | for (auto *target : all_non_exited_process_targets ()) |
5634 | { | |
148cf134 SM |
5635 | if (inf != nullptr && inf->process_target () != target) |
5636 | continue; | |
5637 | ||
6ad82919 TBA |
5638 | switch_to_target_no_thread (target); |
5639 | target_thread_events (false); | |
5640 | } | |
5641 | ||
17417fb0 | 5642 | /* Use debug_prefixed_printf directly to get a meaningful function |
dda83cd7 | 5643 | name. */ |
6ad82919 | 5644 | if (debug_infrun) |
17417fb0 | 5645 | debug_prefixed_printf ("infrun", "stop_all_threads", "done"); |
6ad82919 | 5646 | }; |
65706a29 | 5647 | |
372316f1 PA |
5648 | /* Request threads to stop, and then wait for the stops. Because |
5649 | threads we already know about can spawn more threads while we're | |
5650 | trying to stop them, and we only learn about new threads when we | |
5651 | update the thread list, do this in a loop, and keep iterating | |
5652 | until two passes find no threads that need to be stopped. */ | |
5653 | for (pass = 0; pass < 2; pass++, iterations++) | |
5654 | { | |
1eb8556f | 5655 | infrun_debug_printf ("pass=%d, iterations=%d", pass, iterations); |
372316f1 PA |
5656 | while (1) |
5657 | { | |
29d6859f | 5658 | int waits_needed = 0; |
372316f1 | 5659 | |
a05575d3 TBA |
5660 | for (auto *target : all_non_exited_process_targets ()) |
5661 | { | |
148cf134 SM |
5662 | if (inf != nullptr && inf->process_target () != target) |
5663 | continue; | |
5664 | ||
a05575d3 TBA |
5665 | switch_to_target_no_thread (target); |
5666 | update_thread_list (); | |
5667 | } | |
372316f1 PA |
5668 | |
5669 | /* Go through all threads looking for threads that we need | |
5670 | to tell the target to stop. */ | |
08036331 | 5671 | for (thread_info *t : all_non_exited_threads ()) |
372316f1 | 5672 | { |
148cf134 SM |
5673 | if (inf != nullptr && t->inf != inf) |
5674 | continue; | |
5675 | ||
53cccef1 TBA |
5676 | /* For a single-target setting with an all-stop target, |
5677 | we would not even arrive here. For a multi-target | |
5678 | setting, until GDB is able to handle a mixture of | |
5679 | all-stop and non-stop targets, simply skip all-stop | |
5680 | targets' threads. This should be fine due to the | |
5681 | protection of 'check_multi_target_resumption'. */ | |
5682 | ||
5683 | switch_to_thread_no_regs (t); | |
5684 | if (!target_is_non_stop_p ()) | |
5685 | continue; | |
5686 | ||
611841bb | 5687 | if (t->executing ()) |
372316f1 PA |
5688 | { |
5689 | /* If already stopping, don't request a stop again. | |
5690 | We just haven't seen the notification yet. */ | |
5691 | if (!t->stop_requested) | |
5692 | { | |
1eb8556f | 5693 | infrun_debug_printf (" %s executing, need stop", |
0fab7955 | 5694 | t->ptid.to_string ().c_str ()); |
372316f1 PA |
5695 | target_stop (t->ptid); |
5696 | t->stop_requested = 1; | |
5697 | } | |
5698 | else | |
5699 | { | |
1eb8556f | 5700 | infrun_debug_printf (" %s executing, already stopping", |
0fab7955 | 5701 | t->ptid.to_string ().c_str ()); |
372316f1 PA |
5702 | } |
5703 | ||
5704 | if (t->stop_requested) | |
29d6859f | 5705 | waits_needed++; |
372316f1 PA |
5706 | } |
5707 | else | |
5708 | { | |
1eb8556f | 5709 | infrun_debug_printf (" %s not executing", |
0fab7955 | 5710 | t->ptid.to_string ().c_str ()); |
372316f1 PA |
5711 | |
5712 | /* The thread may be not executing, but still be | |
5713 | resumed with a pending status to process. */ | |
7846f3aa | 5714 | t->set_resumed (false); |
372316f1 PA |
5715 | } |
5716 | } | |
5717 | ||
29d6859f | 5718 | if (waits_needed == 0) |
372316f1 PA |
5719 | break; |
5720 | ||
5721 | /* If we find new threads on the second iteration, restart | |
5722 | over. We want to see two iterations in a row with all | |
5723 | threads stopped. */ | |
5724 | if (pass > 0) | |
5725 | pass = -1; | |
5726 | ||
d828dbed PA |
5727 | reenable_target_async (); |
5728 | ||
29d6859f | 5729 | for (int i = 0; i < waits_needed; i++) |
c29705b7 | 5730 | { |
29d6859f | 5731 | wait_one_event event = wait_one (); |
d758e62c PA |
5732 | if (handle_one (event)) |
5733 | break; | |
372316f1 PA |
5734 | } |
5735 | } | |
5736 | } | |
372316f1 PA |
5737 | } |
5738 | ||
21d48304 PA |
5739 | /* Handle a TARGET_WAITKIND_NO_RESUMED event. Return true if we |
5740 | handled the event and should continue waiting. Return false if we | |
5741 | should stop and report the event to the user. */ | |
f4836ba9 | 5742 | |
c4464ade | 5743 | static bool |
f4836ba9 PA |
5744 | handle_no_resumed (struct execution_control_state *ecs) |
5745 | { | |
3b12939d | 5746 | if (target_can_async_p ()) |
f4836ba9 | 5747 | { |
c4464ade | 5748 | bool any_sync = false; |
f4836ba9 | 5749 | |
2dab0c7b | 5750 | for (ui *ui : all_uis ()) |
3b12939d PA |
5751 | { |
5752 | if (ui->prompt_state == PROMPT_BLOCKED) | |
5753 | { | |
c4464ade | 5754 | any_sync = true; |
3b12939d PA |
5755 | break; |
5756 | } | |
5757 | } | |
5758 | if (!any_sync) | |
5759 | { | |
5760 | /* There were no unwaited-for children left in the target, but, | |
5761 | we're not synchronously waiting for events either. Just | |
5762 | ignore. */ | |
5763 | ||
1eb8556f | 5764 | infrun_debug_printf ("TARGET_WAITKIND_NO_RESUMED (ignoring: bg)"); |
3b12939d | 5765 | prepare_to_wait (ecs); |
c4464ade | 5766 | return true; |
3b12939d | 5767 | } |
f4836ba9 PA |
5768 | } |
5769 | ||
5770 | /* Otherwise, if we were running a synchronous execution command, we | |
5771 | may need to cancel it and give the user back the terminal. | |
5772 | ||
5773 | In non-stop mode, the target can't tell whether we've already | |
5774 | consumed previous stop events, so it can end up sending us a | |
5775 | no-resumed event like so: | |
5776 | ||
5777 | #0 - thread 1 is left stopped | |
5778 | ||
5779 | #1 - thread 2 is resumed and hits breakpoint | |
dda83cd7 | 5780 | -> TARGET_WAITKIND_STOPPED |
f4836ba9 PA |
5781 | |
5782 | #2 - thread 3 is resumed and exits | |
dda83cd7 | 5783 | this is the last resumed thread, so |
f4836ba9 PA |
5784 | -> TARGET_WAITKIND_NO_RESUMED |
5785 | ||
5786 | #3 - gdb processes stop for thread 2 and decides to re-resume | |
dda83cd7 | 5787 | it. |
f4836ba9 PA |
5788 | |
5789 | #4 - gdb processes the TARGET_WAITKIND_NO_RESUMED event. | |
dda83cd7 | 5790 | thread 2 is now resumed, so the event should be ignored. |
f4836ba9 PA |
5791 | |
5792 | IOW, if the stop for thread 2 doesn't end a foreground command, | |
5793 | then we need to ignore the following TARGET_WAITKIND_NO_RESUMED | |
5794 | event. But it could be that the event meant that thread 2 itself | |
5795 | (or whatever other thread was the last resumed thread) exited. | |
5796 | ||
5797 | To address this we refresh the thread list and check whether we | |
5798 | have resumed threads _now_. In the example above, this removes | |
5799 | thread 3 from the thread list. If thread 2 was re-resumed, we | |
5800 | ignore this event. If we find no thread resumed, then we cancel | |
7d3badc6 PA |
5801 | the synchronous command and show "no unwaited-for " to the |
5802 | user. */ | |
f4836ba9 | 5803 | |
d6cc5d98 | 5804 | inferior *curr_inf = current_inferior (); |
7d3badc6 | 5805 | |
d6cc5d98 | 5806 | scoped_restore_current_thread restore_thread; |
1e864019 | 5807 | update_thread_list (); |
d6cc5d98 PA |
5808 | |
5809 | /* If: | |
5810 | ||
5811 | - the current target has no thread executing, and | |
5812 | - the current inferior is native, and | |
5813 | - the current inferior is the one which has the terminal, and | |
5814 | - we did nothing, | |
5815 | ||
5816 | then a Ctrl-C from this point on would remain stuck in the | |
5817 | kernel, until a thread resumes and dequeues it. That would | |
5818 | result in the GDB CLI not reacting to Ctrl-C, not able to | |
5819 | interrupt the program. To address this, if the current inferior | |
5820 | no longer has any thread executing, we give the terminal to some | |
5821 | other inferior that has at least one thread executing. */ | |
5822 | bool swap_terminal = true; | |
5823 | ||
5824 | /* Whether to ignore this TARGET_WAITKIND_NO_RESUMED event, or | |
5825 | whether to report it to the user. */ | |
5826 | bool ignore_event = false; | |
7d3badc6 PA |
5827 | |
5828 | for (thread_info *thread : all_non_exited_threads ()) | |
f4836ba9 | 5829 | { |
611841bb | 5830 | if (swap_terminal && thread->executing ()) |
d6cc5d98 PA |
5831 | { |
5832 | if (thread->inf != curr_inf) | |
5833 | { | |
5834 | target_terminal::ours (); | |
5835 | ||
5836 | switch_to_thread (thread); | |
5837 | target_terminal::inferior (); | |
5838 | } | |
5839 | swap_terminal = false; | |
5840 | } | |
5841 | ||
4d772ea2 | 5842 | if (!ignore_event && thread->resumed ()) |
f4836ba9 | 5843 | { |
7d3badc6 PA |
5844 | /* Either there were no unwaited-for children left in the |
5845 | target at some point, but there are now, or some target | |
5846 | other than the eventing one has unwaited-for children | |
5847 | left. Just ignore. */ | |
1eb8556f SM |
5848 | infrun_debug_printf ("TARGET_WAITKIND_NO_RESUMED " |
5849 | "(ignoring: found resumed)"); | |
d6cc5d98 PA |
5850 | |
5851 | ignore_event = true; | |
f4836ba9 | 5852 | } |
d6cc5d98 PA |
5853 | |
5854 | if (ignore_event && !swap_terminal) | |
5855 | break; | |
5856 | } | |
5857 | ||
5858 | if (ignore_event) | |
5859 | { | |
5860 | switch_to_inferior_no_thread (curr_inf); | |
5861 | prepare_to_wait (ecs); | |
c4464ade | 5862 | return true; |
f4836ba9 PA |
5863 | } |
5864 | ||
5865 | /* Go ahead and report the event. */ | |
c4464ade | 5866 | return false; |
f4836ba9 PA |
5867 | } |
5868 | ||
21d48304 PA |
5869 | /* Handle a TARGET_WAITKIND_THREAD_EXITED event. Return true if we |
5870 | handled the event and should continue waiting. Return false if we | |
5871 | should stop and report the event to the user. */ | |
5872 | ||
5873 | static bool | |
5874 | handle_thread_exited (execution_control_state *ecs) | |
5875 | { | |
5876 | context_switch (ecs); | |
5877 | ||
5878 | /* Clear these so we don't re-start the thread stepping over a | |
5879 | breakpoint/watchpoint. */ | |
5880 | ecs->event_thread->stepping_over_breakpoint = 0; | |
5881 | ecs->event_thread->stepping_over_watchpoint = 0; | |
5882 | ||
9488c327 PA |
5883 | /* If the thread had an FSM, then abort the command. But only after |
5884 | finishing the step over, as in non-stop mode, aborting this | |
5885 | thread's command should not interfere with other threads. We | |
5886 | must check this before finish_step over, however, which may | |
5887 | update the thread list and delete the event thread. */ | |
5888 | bool abort_cmd = (ecs->event_thread->thread_fsm () != nullptr); | |
5889 | ||
45fd40cf PA |
5890 | /* Mark the thread exited right now, because finish_step_over may |
5891 | update the thread list and that may delete the thread silently | |
5892 | (depending on target), while we always want to emit the "[Thread | |
5893 | ... exited]" notification. Don't actually delete the thread yet, | |
5894 | because we need to pass its pointer down to finish_step_over. */ | |
5895 | set_thread_exited (ecs->event_thread); | |
5896 | ||
21d48304 PA |
5897 | /* Maybe the thread was doing a step-over, if so release |
5898 | resources and start any further pending step-overs. | |
5899 | ||
5900 | If we are on a non-stop target and the thread was doing an | |
5901 | in-line step, this also restarts the other threads. */ | |
5902 | int ret = finish_step_over (ecs); | |
5903 | ||
5904 | /* finish_step_over returns true if it moves ecs' wait status | |
5905 | back into the thread, so that we go handle another pending | |
5906 | event before this one. But we know it never does that if | |
5907 | the event thread has exited. */ | |
5908 | gdb_assert (ret == 0); | |
5909 | ||
9488c327 PA |
5910 | if (abort_cmd) |
5911 | { | |
d0b59149 PA |
5912 | /* We're stopping for the thread exit event. Switch to the |
5913 | event thread again, as finish_step_over may have switched | |
5914 | threads. */ | |
5915 | switch_to_thread (ecs->event_thread); | |
9488c327 PA |
5916 | ecs->event_thread = nullptr; |
5917 | return false; | |
5918 | } | |
5919 | ||
21d48304 PA |
5920 | /* If finish_step_over started a new in-line step-over, don't |
5921 | try to restart anything else. */ | |
5922 | if (step_over_info_valid_p ()) | |
5923 | { | |
5924 | delete_thread (ecs->event_thread); | |
5925 | return true; | |
5926 | } | |
5927 | ||
5928 | /* Maybe we are on an all-stop target and we got this event | |
5929 | while doing a step-like command on another thread. If so, | |
5930 | go back to doing that. If this thread was stepping, | |
5931 | switch_back_to_stepped_thread will consider that the thread | |
5932 | was interrupted mid-step and will try keep stepping it. We | |
5933 | don't want that, the thread is gone. So clear the proceed | |
5934 | status so it doesn't do that. */ | |
5935 | clear_proceed_status_thread (ecs->event_thread); | |
5936 | if (switch_back_to_stepped_thread (ecs)) | |
5937 | { | |
5938 | delete_thread (ecs->event_thread); | |
5939 | return true; | |
5940 | } | |
5941 | ||
5942 | inferior *inf = ecs->event_thread->inf; | |
5943 | bool slock_applies = schedlock_applies (ecs->event_thread); | |
5944 | ||
5945 | delete_thread (ecs->event_thread); | |
5946 | ecs->event_thread = nullptr; | |
5947 | ||
5948 | /* Continue handling the event as if we had gotten a | |
5949 | TARGET_WAITKIND_NO_RESUMED. */ | |
5950 | auto handle_as_no_resumed = [ecs] () | |
5951 | { | |
5952 | /* handle_no_resumed doesn't really look at the event kind, but | |
5953 | normal_stop does. */ | |
5954 | ecs->ws.set_no_resumed (); | |
5955 | ecs->event_thread = nullptr; | |
5956 | ecs->ptid = minus_one_ptid; | |
5957 | ||
5958 | /* Re-record the last target status. */ | |
5959 | set_last_target_status (ecs->target, ecs->ptid, ecs->ws); | |
5960 | ||
5961 | return handle_no_resumed (ecs); | |
5962 | }; | |
5963 | ||
5964 | /* If we are on an all-stop target, the target has stopped all | |
5965 | threads to report the event. We don't actually want to | |
5966 | stop, so restart the threads. */ | |
5967 | if (!target_is_non_stop_p ()) | |
5968 | { | |
5969 | if (slock_applies) | |
5970 | { | |
5971 | /* Since the target is !non-stop, then everything is stopped | |
5972 | at this point, and we can't assume we'll get further | |
5973 | events until we resume the target again. Handle this | |
5974 | event like if it were a TARGET_WAITKIND_NO_RESUMED. Note | |
5975 | this refreshes the thread list and checks whether there | |
5976 | are other resumed threads before deciding whether to | |
5977 | print "no-unwaited-for left". This is important because | |
5978 | the user could have done: | |
5979 | ||
5980 | (gdb) set scheduler-locking on | |
5981 | (gdb) thread 1 | |
5982 | (gdb) c& | |
5983 | (gdb) thread 2 | |
5984 | (gdb) c | |
5985 | ||
5986 | ... and only one of the threads exited. */ | |
5987 | return handle_as_no_resumed (); | |
5988 | } | |
5989 | else | |
5990 | { | |
5991 | /* Switch to the first non-exited thread we can find, and | |
5992 | resume. */ | |
5993 | auto range = inf->non_exited_threads (); | |
5994 | if (range.begin () == range.end ()) | |
5995 | { | |
5996 | /* Looks like the target reported a | |
5997 | TARGET_WAITKIND_THREAD_EXITED for its last known | |
5998 | thread. */ | |
5999 | return handle_as_no_resumed (); | |
6000 | } | |
6001 | thread_info *non_exited_thread = *range.begin (); | |
6002 | switch_to_thread (non_exited_thread); | |
6003 | insert_breakpoints (); | |
6004 | resume (GDB_SIGNAL_0); | |
6005 | } | |
6006 | } | |
6007 | ||
6008 | prepare_to_wait (ecs); | |
6009 | return true; | |
6010 | } | |
6011 | ||
05ba8510 PA |
6012 | /* Given an execution control state that has been freshly filled in by |
6013 | an event from the inferior, figure out what it means and take | |
6014 | appropriate action. | |
6015 | ||
6016 | The alternatives are: | |
6017 | ||
22bcd14b | 6018 | 1) stop_waiting and return; to really stop and return to the |
05ba8510 PA |
6019 | debugger. |
6020 | ||
6021 | 2) keep_going and return; to wait for the next event (set | |
6022 | ecs->event_thread->stepping_over_breakpoint to 1 to single step | |
6023 | once). */ | |
c906108c | 6024 | |
ec9499be | 6025 | static void |
595915c1 | 6026 | handle_inferior_event (struct execution_control_state *ecs) |
cd0fc7c3 | 6027 | { |
595915c1 TT |
6028 | /* Make sure that all temporary struct value objects that were |
6029 | created during the handling of the event get deleted at the | |
6030 | end. */ | |
6031 | scoped_value_mark free_values; | |
6032 | ||
7dca2ea7 | 6033 | infrun_debug_printf ("%s", ecs->ws.to_string ().c_str ()); |
c29705b7 | 6034 | |
183be222 | 6035 | if (ecs->ws.kind () == TARGET_WAITKIND_IGNORE) |
28736962 PA |
6036 | { |
6037 | /* We had an event in the inferior, but we are not interested in | |
6038 | handling it at this level. The lower layers have already | |
6039 | done what needs to be done, if anything. | |
6040 | ||
6041 | One of the possible circumstances for this is when the | |
6042 | inferior produces output for the console. The inferior has | |
6043 | not stopped, and we are ignoring the event. Another possible | |
6044 | circumstance is any event which the lower level knows will be | |
6045 | reported multiple times without an intervening resume. */ | |
28736962 PA |
6046 | prepare_to_wait (ecs); |
6047 | return; | |
6048 | } | |
6049 | ||
183be222 | 6050 | if (ecs->ws.kind () == TARGET_WAITKIND_NO_RESUMED |
f4836ba9 PA |
6051 | && handle_no_resumed (ecs)) |
6052 | return; | |
0e5bf2a8 | 6053 | |
5b6d1e4f PA |
6054 | /* Cache the last target/ptid/waitstatus. */ |
6055 | set_last_target_status (ecs->target, ecs->ptid, ecs->ws); | |
e02bc4cc | 6056 | |
ca005067 | 6057 | /* Always clear state belonging to the previous time we stopped. */ |
aa7d318d | 6058 | stop_stack_dummy = STOP_NONE; |
ca005067 | 6059 | |
183be222 | 6060 | if (ecs->ws.kind () == TARGET_WAITKIND_NO_RESUMED) |
0e5bf2a8 PA |
6061 | { |
6062 | /* No unwaited-for children left. IOW, all resumed children | |
6063 | have exited. */ | |
22bcd14b | 6064 | stop_waiting (ecs); |
0e5bf2a8 PA |
6065 | return; |
6066 | } | |
6067 | ||
183be222 SM |
6068 | if (ecs->ws.kind () != TARGET_WAITKIND_EXITED |
6069 | && ecs->ws.kind () != TARGET_WAITKIND_SIGNALLED) | |
359f5fe6 | 6070 | { |
9213a6d7 | 6071 | ecs->event_thread = ecs->target->find_thread (ecs->ptid); |
359f5fe6 | 6072 | /* If it's a new thread, add it to the thread database. */ |
03acd4d8 | 6073 | if (ecs->event_thread == nullptr) |
5b6d1e4f | 6074 | ecs->event_thread = add_thread (ecs->target, ecs->ptid); |
c1e36e3e PA |
6075 | |
6076 | /* Disable range stepping. If the next step request could use a | |
6077 | range, this will be end up re-enabled then. */ | |
6078 | ecs->event_thread->control.may_range_step = 0; | |
359f5fe6 | 6079 | } |
88ed393a JK |
6080 | |
6081 | /* Dependent on valid ECS->EVENT_THREAD. */ | |
c272a98c | 6082 | adjust_pc_after_break (ecs->event_thread, ecs->ws); |
88ed393a JK |
6083 | |
6084 | /* Dependent on the current PC value modified by adjust_pc_after_break. */ | |
6085 | reinit_frame_cache (); | |
6086 | ||
28736962 PA |
6087 | breakpoint_retire_moribund (); |
6088 | ||
2b009048 DJ |
6089 | /* First, distinguish signals caused by the debugger from signals |
6090 | that have to do with the program's own actions. Note that | |
6091 | breakpoint insns may cause SIGTRAP or SIGILL or SIGEMT, depending | |
6092 | on the operating system version. Here we detect when a SIGILL or | |
6093 | SIGEMT is really a breakpoint and change it to SIGTRAP. We do | |
6094 | something similar for SIGSEGV, since a SIGSEGV will be generated | |
6095 | when we're trying to execute a breakpoint instruction on a | |
6096 | non-executable stack. This happens for call dummy breakpoints | |
6097 | for architectures like SPARC that place call dummies on the | |
6098 | stack. */ | |
183be222 SM |
6099 | if (ecs->ws.kind () == TARGET_WAITKIND_STOPPED |
6100 | && (ecs->ws.sig () == GDB_SIGNAL_ILL | |
6101 | || ecs->ws.sig () == GDB_SIGNAL_SEGV | |
6102 | || ecs->ws.sig () == GDB_SIGNAL_EMT)) | |
2b009048 | 6103 | { |
00431a78 | 6104 | struct regcache *regcache = get_thread_regcache (ecs->event_thread); |
de0a0249 | 6105 | |
f9582a22 | 6106 | if (breakpoint_inserted_here_p (ecs->event_thread->inf->aspace.get (), |
de0a0249 UW |
6107 | regcache_read_pc (regcache))) |
6108 | { | |
1eb8556f | 6109 | infrun_debug_printf ("Treating signal as SIGTRAP"); |
183be222 | 6110 | ecs->ws.set_stopped (GDB_SIGNAL_TRAP); |
de0a0249 | 6111 | } |
2b009048 DJ |
6112 | } |
6113 | ||
293b3ebc | 6114 | mark_non_executing_threads (ecs->target, ecs->ptid, ecs->ws); |
8c90c137 | 6115 | |
183be222 | 6116 | switch (ecs->ws.kind ()) |
488f131b JB |
6117 | { |
6118 | case TARGET_WAITKIND_LOADED: | |
72d383bb SM |
6119 | { |
6120 | context_switch (ecs); | |
6121 | /* Ignore gracefully during startup of the inferior, as it might | |
6122 | be the shell which has just loaded some objects, otherwise | |
6123 | add the symbols for the newly loaded objects. Also ignore at | |
6124 | the beginning of an attach or remote session; we will query | |
6125 | the full list of libraries once the connection is | |
6126 | established. */ | |
6127 | ||
6128 | stop_kind stop_soon = get_inferior_stop_soon (ecs); | |
6129 | if (stop_soon == NO_STOP_QUIETLY) | |
6130 | { | |
6131 | struct regcache *regcache; | |
edcc5120 | 6132 | |
72d383bb | 6133 | regcache = get_thread_regcache (ecs->event_thread); |
edcc5120 | 6134 | |
72d383bb | 6135 | handle_solib_event (); |
ab04a2af | 6136 | |
9279eb5c | 6137 | ecs->event_thread->set_stop_pc (regcache_read_pc (regcache)); |
f9582a22 | 6138 | address_space *aspace = ecs->event_thread->inf->aspace.get (); |
72d383bb | 6139 | ecs->event_thread->control.stop_bpstat |
f9582a22 | 6140 | = bpstat_stop_status_nowatch (aspace, |
d37e0847 PA |
6141 | ecs->event_thread->stop_pc (), |
6142 | ecs->event_thread, ecs->ws); | |
c65d6b55 | 6143 | |
72d383bb | 6144 | if (handle_stop_requested (ecs)) |
94c57d6a | 6145 | return; |
488f131b | 6146 | |
72d383bb SM |
6147 | if (bpstat_causes_stop (ecs->event_thread->control.stop_bpstat)) |
6148 | { | |
6149 | /* A catchpoint triggered. */ | |
6150 | process_event_stop_test (ecs); | |
6151 | return; | |
6152 | } | |
55409f9d | 6153 | |
72d383bb SM |
6154 | /* If requested, stop when the dynamic linker notifies |
6155 | gdb of events. This allows the user to get control | |
6156 | and place breakpoints in initializer routines for | |
6157 | dynamically loaded objects (among other things). */ | |
1edb66d8 | 6158 | ecs->event_thread->set_stop_signal (GDB_SIGNAL_0); |
72d383bb SM |
6159 | if (stop_on_solib_events) |
6160 | { | |
6161 | /* Make sure we print "Stopped due to solib-event" in | |
6162 | normal_stop. */ | |
6163 | stop_print_frame = true; | |
b0f4b84b | 6164 | |
72d383bb SM |
6165 | stop_waiting (ecs); |
6166 | return; | |
6167 | } | |
6168 | } | |
b0f4b84b | 6169 | |
72d383bb SM |
6170 | /* If we are skipping through a shell, or through shared library |
6171 | loading that we aren't interested in, resume the program. If | |
6172 | we're running the program normally, also resume. */ | |
6173 | if (stop_soon == STOP_QUIETLY || stop_soon == NO_STOP_QUIETLY) | |
6174 | { | |
6175 | /* Loading of shared libraries might have changed breakpoint | |
6176 | addresses. Make sure new breakpoints are inserted. */ | |
6177 | if (stop_soon == NO_STOP_QUIETLY) | |
6178 | insert_breakpoints (); | |
6179 | resume (GDB_SIGNAL_0); | |
6180 | prepare_to_wait (ecs); | |
6181 | return; | |
6182 | } | |
5c09a2c5 | 6183 | |
72d383bb SM |
6184 | /* But stop if we're attaching or setting up a remote |
6185 | connection. */ | |
6186 | if (stop_soon == STOP_QUIETLY_NO_SIGSTOP | |
6187 | || stop_soon == STOP_QUIETLY_REMOTE) | |
6188 | { | |
6189 | infrun_debug_printf ("quietly stopped"); | |
6190 | stop_waiting (ecs); | |
6191 | return; | |
6192 | } | |
6193 | ||
f34652de | 6194 | internal_error (_("unhandled stop_soon: %d"), (int) stop_soon); |
72d383bb | 6195 | } |
c5aa993b | 6196 | |
488f131b | 6197 | case TARGET_WAITKIND_SPURIOUS: |
c65d6b55 PA |
6198 | if (handle_stop_requested (ecs)) |
6199 | return; | |
00431a78 | 6200 | context_switch (ecs); |
64ce06e4 | 6201 | resume (GDB_SIGNAL_0); |
488f131b JB |
6202 | prepare_to_wait (ecs); |
6203 | return; | |
c5aa993b | 6204 | |
65706a29 | 6205 | case TARGET_WAITKIND_THREAD_CREATED: |
c65d6b55 PA |
6206 | if (handle_stop_requested (ecs)) |
6207 | return; | |
00431a78 | 6208 | context_switch (ecs); |
65706a29 PA |
6209 | if (!switch_back_to_stepped_thread (ecs)) |
6210 | keep_going (ecs); | |
6211 | return; | |
6212 | ||
21d48304 PA |
6213 | case TARGET_WAITKIND_THREAD_EXITED: |
6214 | if (handle_thread_exited (ecs)) | |
6215 | return; | |
6216 | stop_waiting (ecs); | |
6217 | break; | |
6218 | ||
488f131b | 6219 | case TARGET_WAITKIND_EXITED: |
940c3c06 | 6220 | case TARGET_WAITKIND_SIGNALLED: |
18493a00 PA |
6221 | { |
6222 | /* Depending on the system, ecs->ptid may point to a thread or | |
6223 | to a process. On some targets, target_mourn_inferior may | |
6224 | need to have access to the just-exited thread. That is the | |
6225 | case of GNU/Linux's "checkpoint" support, for example. | |
6226 | Call the switch_to_xxx routine as appropriate. */ | |
9213a6d7 | 6227 | thread_info *thr = ecs->target->find_thread (ecs->ptid); |
18493a00 PA |
6228 | if (thr != nullptr) |
6229 | switch_to_thread (thr); | |
6230 | else | |
6231 | { | |
6232 | inferior *inf = find_inferior_ptid (ecs->target, ecs->ptid); | |
6233 | switch_to_inferior_no_thread (inf); | |
6234 | } | |
6235 | } | |
6c95b8df | 6236 | handle_vfork_child_exec_or_exit (0); |
223ffa71 | 6237 | target_terminal::ours (); /* Must do this before mourn anyway. */ |
488f131b | 6238 | |
0c557179 SDJ |
6239 | /* Clearing any previous state of convenience variables. */ |
6240 | clear_exit_convenience_vars (); | |
6241 | ||
183be222 | 6242 | if (ecs->ws.kind () == TARGET_WAITKIND_EXITED) |
940c3c06 PA |
6243 | { |
6244 | /* Record the exit code in the convenience variable $_exitcode, so | |
6245 | that the user can inspect this again later. */ | |
6246 | set_internalvar_integer (lookup_internalvar ("_exitcode"), | |
183be222 | 6247 | (LONGEST) ecs->ws.exit_status ()); |
940c3c06 PA |
6248 | |
6249 | /* Also record this in the inferior itself. */ | |
30220b46 | 6250 | current_inferior ()->has_exit_code = true; |
183be222 | 6251 | current_inferior ()->exit_code = (LONGEST) ecs->ws.exit_status (); |
8cf64490 | 6252 | |
98eb56a4 | 6253 | /* Support the --return-child-result option. */ |
183be222 | 6254 | return_child_result_value = ecs->ws.exit_status (); |
98eb56a4 | 6255 | |
bf64d1d5 | 6256 | interps_notify_exited (ecs->ws.exit_status ()); |
940c3c06 PA |
6257 | } |
6258 | else | |
0c557179 | 6259 | { |
27b1f19f | 6260 | struct gdbarch *gdbarch = current_inferior ()->arch (); |
0c557179 SDJ |
6261 | |
6262 | if (gdbarch_gdb_signal_to_target_p (gdbarch)) | |
6263 | { | |
6264 | /* Set the value of the internal variable $_exitsignal, | |
6265 | which holds the signal uncaught by the inferior. */ | |
6266 | set_internalvar_integer (lookup_internalvar ("_exitsignal"), | |
6267 | gdbarch_gdb_signal_to_target (gdbarch, | |
183be222 | 6268 | ecs->ws.sig ())); |
0c557179 SDJ |
6269 | } |
6270 | else | |
6271 | { | |
6272 | /* We don't have access to the target's method used for | |
6273 | converting between signal numbers (GDB's internal | |
6274 | representation <-> target's representation). | |
6275 | Therefore, we cannot do a good job at displaying this | |
6276 | information to the user. It's better to just warn | |
6277 | her about it (if infrun debugging is enabled), and | |
6278 | give up. */ | |
1eb8556f SM |
6279 | infrun_debug_printf ("Cannot fill $_exitsignal with the correct " |
6280 | "signal number."); | |
0c557179 SDJ |
6281 | } |
6282 | ||
d6bd2ef5 | 6283 | interps_notify_signal_exited (ecs->ws.sig ()); |
0c557179 | 6284 | } |
8cf64490 | 6285 | |
488f131b | 6286 | gdb_flush (gdb_stdout); |
bc1e6c81 | 6287 | target_mourn_inferior (inferior_ptid); |
c4464ade | 6288 | stop_print_frame = false; |
22bcd14b | 6289 | stop_waiting (ecs); |
488f131b | 6290 | return; |
c5aa993b | 6291 | |
488f131b | 6292 | case TARGET_WAITKIND_FORKED: |
deb3b17b | 6293 | case TARGET_WAITKIND_VFORKED: |
0d36baa9 PA |
6294 | case TARGET_WAITKIND_THREAD_CLONED: |
6295 | ||
6296 | displaced_step_finish (ecs->event_thread, ecs->ws); | |
6297 | ||
6298 | /* Start a new step-over in another thread if there's one that | |
6299 | needs it. */ | |
6300 | start_step_over (); | |
e2d96639 | 6301 | |
00431a78 | 6302 | context_switch (ecs); |
5a2901d9 | 6303 | |
b242c3c2 PA |
6304 | /* Immediately detach breakpoints from the child before there's |
6305 | any chance of letting the user delete breakpoints from the | |
6306 | breakpoint lists. If we don't do this early, it's easy to | |
6307 | leave left over traps in the child, vis: "break foo; catch | |
6308 | fork; c; <fork>; del; c; <child calls foo>". We only follow | |
6309 | the fork on the last `continue', and by that time the | |
6310 | breakpoint at "foo" is long gone from the breakpoint table. | |
6311 | If we vforked, then we don't need to unpatch here, since both | |
6312 | parent and child are sharing the same memory pages; we'll | |
6313 | need to unpatch at follow/detach time instead to be certain | |
6314 | that new breakpoints added between catchpoint hit time and | |
6315 | vfork follow are detached. */ | |
0d36baa9 | 6316 | if (ecs->ws.kind () == TARGET_WAITKIND_FORKED) |
b242c3c2 | 6317 | { |
b242c3c2 PA |
6318 | /* This won't actually modify the breakpoint list, but will |
6319 | physically remove the breakpoints from the child. */ | |
183be222 | 6320 | detach_breakpoints (ecs->ws.child_ptid ()); |
b242c3c2 PA |
6321 | } |
6322 | ||
34b7e8a6 | 6323 | delete_just_stopped_threads_single_step_breakpoints (); |
d03285ec | 6324 | |
e58b0e63 PA |
6325 | /* In case the event is caught by a catchpoint, remember that |
6326 | the event is to be followed at the next resume of the thread, | |
6327 | and not immediately. */ | |
6328 | ecs->event_thread->pending_follow = ecs->ws; | |
6329 | ||
1edb66d8 SM |
6330 | ecs->event_thread->set_stop_pc |
6331 | (regcache_read_pc (get_thread_regcache (ecs->event_thread))); | |
675bf4cb | 6332 | |
16c381f0 | 6333 | ecs->event_thread->control.stop_bpstat |
f9582a22 | 6334 | = bpstat_stop_status_nowatch (ecs->event_thread->inf->aspace.get (), |
d37e0847 PA |
6335 | ecs->event_thread->stop_pc (), |
6336 | ecs->event_thread, ecs->ws); | |
675bf4cb | 6337 | |
c65d6b55 PA |
6338 | if (handle_stop_requested (ecs)) |
6339 | return; | |
6340 | ||
ce12b012 PA |
6341 | /* If no catchpoint triggered for this, then keep going. Note |
6342 | that we're interested in knowing the bpstat actually causes a | |
6343 | stop, not just if it may explain the signal. Software | |
6344 | watchpoints, for example, always appear in the bpstat. */ | |
6345 | if (!bpstat_causes_stop (ecs->event_thread->control.stop_bpstat)) | |
04e68871 | 6346 | { |
5ab2fbf1 | 6347 | bool follow_child |
0d36baa9 PA |
6348 | = (ecs->ws.kind () != TARGET_WAITKIND_THREAD_CLONED |
6349 | && follow_fork_mode_string == follow_fork_mode_child); | |
e58b0e63 | 6350 | |
1edb66d8 | 6351 | ecs->event_thread->set_stop_signal (GDB_SIGNAL_0); |
e58b0e63 | 6352 | |
5b6d1e4f PA |
6353 | process_stratum_target *targ |
6354 | = ecs->event_thread->inf->process_target (); | |
6355 | ||
0d36baa9 PA |
6356 | bool should_resume; |
6357 | if (ecs->ws.kind () != TARGET_WAITKIND_THREAD_CLONED) | |
6358 | should_resume = follow_fork (); | |
6359 | else | |
6360 | { | |
6361 | should_resume = true; | |
6362 | inferior *inf = ecs->event_thread->inf; | |
6363 | inf->top_target ()->follow_clone (ecs->ws.child_ptid ()); | |
6364 | ecs->event_thread->pending_follow.set_spurious (); | |
6365 | } | |
e58b0e63 | 6366 | |
5b6d1e4f PA |
6367 | /* Note that one of these may be an invalid pointer, |
6368 | depending on detach_fork. */ | |
00431a78 | 6369 | thread_info *parent = ecs->event_thread; |
9213a6d7 | 6370 | thread_info *child = targ->find_thread (ecs->ws.child_ptid ()); |
6c95b8df | 6371 | |
a2077e25 PA |
6372 | /* At this point, the parent is marked running, and the |
6373 | child is marked stopped. */ | |
6374 | ||
6375 | /* If not resuming the parent, mark it stopped. */ | |
0d36baa9 PA |
6376 | if (ecs->ws.kind () != TARGET_WAITKIND_THREAD_CLONED |
6377 | && follow_child && !detach_fork && !non_stop && !sched_multi) | |
00431a78 | 6378 | parent->set_running (false); |
a2077e25 PA |
6379 | |
6380 | /* If resuming the child, mark it running. */ | |
7ac958f2 PA |
6381 | if ((ecs->ws.kind () == TARGET_WAITKIND_THREAD_CLONED |
6382 | && !schedlock_applies (ecs->event_thread)) | |
6383 | || (ecs->ws.kind () != TARGET_WAITKIND_THREAD_CLONED | |
6384 | && (follow_child | |
6385 | || (!detach_fork && (non_stop || sched_multi))))) | |
00431a78 | 6386 | child->set_running (true); |
a2077e25 | 6387 | |
6c95b8df | 6388 | /* In non-stop mode, also resume the other branch. */ |
0d36baa9 | 6389 | if ((ecs->ws.kind () == TARGET_WAITKIND_THREAD_CLONED |
7ac958f2 PA |
6390 | && target_is_non_stop_p () |
6391 | && !schedlock_applies (ecs->event_thread)) | |
6392 | || (ecs->ws.kind () != TARGET_WAITKIND_THREAD_CLONED | |
6393 | && (!detach_fork && (non_stop | |
6394 | || (sched_multi | |
6395 | && target_is_non_stop_p ()))))) | |
6c95b8df PA |
6396 | { |
6397 | if (follow_child) | |
6398 | switch_to_thread (parent); | |
6399 | else | |
6400 | switch_to_thread (child); | |
6401 | ||
6402 | ecs->event_thread = inferior_thread (); | |
6403 | ecs->ptid = inferior_ptid; | |
6404 | keep_going (ecs); | |
6405 | } | |
6406 | ||
6407 | if (follow_child) | |
6408 | switch_to_thread (child); | |
6409 | else | |
6410 | switch_to_thread (parent); | |
6411 | ||
e58b0e63 PA |
6412 | ecs->event_thread = inferior_thread (); |
6413 | ecs->ptid = inferior_ptid; | |
6414 | ||
6415 | if (should_resume) | |
27f9f649 SM |
6416 | { |
6417 | /* Never call switch_back_to_stepped_thread if we are waiting for | |
287de656 | 6418 | vfork-done (waiting for an external vfork child to exec or |
27f9f649 SM |
6419 | exit). We will resume only the vforking thread for the purpose |
6420 | of collecting the vfork-done event, and we will restart any | |
6421 | step once the critical shared address space window is done. */ | |
6422 | if ((!follow_child | |
6423 | && detach_fork | |
6424 | && parent->inf->thread_waiting_for_vfork_done != nullptr) | |
6425 | || !switch_back_to_stepped_thread (ecs)) | |
6426 | keep_going (ecs); | |
6427 | } | |
e58b0e63 | 6428 | else |
22bcd14b | 6429 | stop_waiting (ecs); |
04e68871 DJ |
6430 | return; |
6431 | } | |
94c57d6a PA |
6432 | process_event_stop_test (ecs); |
6433 | return; | |
488f131b | 6434 | |
6c95b8df PA |
6435 | case TARGET_WAITKIND_VFORK_DONE: |
6436 | /* Done with the shared memory region. Re-insert breakpoints in | |
6437 | the parent, and keep going. */ | |
6438 | ||
00431a78 | 6439 | context_switch (ecs); |
6c95b8df | 6440 | |
d8bbae6e SM |
6441 | handle_vfork_done (ecs->event_thread); |
6442 | gdb_assert (inferior_thread () == ecs->event_thread); | |
c65d6b55 PA |
6443 | |
6444 | if (handle_stop_requested (ecs)) | |
6445 | return; | |
6446 | ||
27f9f649 SM |
6447 | if (!switch_back_to_stepped_thread (ecs)) |
6448 | { | |
6449 | gdb_assert (inferior_thread () == ecs->event_thread); | |
6450 | /* This also takes care of reinserting breakpoints in the | |
6451 | previously locked inferior. */ | |
6452 | keep_going (ecs); | |
6453 | } | |
6c95b8df PA |
6454 | return; |
6455 | ||
488f131b | 6456 | case TARGET_WAITKIND_EXECD: |
488f131b | 6457 | |
cbd2b4e3 PA |
6458 | /* Note we can't read registers yet (the stop_pc), because we |
6459 | don't yet know the inferior's post-exec architecture. | |
6460 | 'stop_pc' is explicitly read below instead. */ | |
00431a78 | 6461 | switch_to_thread_no_regs (ecs->event_thread); |
5a2901d9 | 6462 | |
6c95b8df PA |
6463 | /* Do whatever is necessary to the parent branch of the vfork. */ |
6464 | handle_vfork_child_exec_or_exit (1); | |
6465 | ||
795e548f | 6466 | /* This causes the eventpoints and symbol table to be reset. |
dda83cd7 SM |
6467 | Must do this now, before trying to determine whether to |
6468 | stop. */ | |
183be222 | 6469 | follow_exec (inferior_ptid, ecs->ws.execd_pathname ()); |
795e548f | 6470 | |
17d8546e DB |
6471 | /* In follow_exec we may have deleted the original thread and |
6472 | created a new one. Make sure that the event thread is the | |
6473 | execd thread for that case (this is a nop otherwise). */ | |
6474 | ecs->event_thread = inferior_thread (); | |
6475 | ||
1edb66d8 SM |
6476 | ecs->event_thread->set_stop_pc |
6477 | (regcache_read_pc (get_thread_regcache (ecs->event_thread))); | |
ecdc3a72 | 6478 | |
16c381f0 | 6479 | ecs->event_thread->control.stop_bpstat |
f9582a22 | 6480 | = bpstat_stop_status_nowatch (ecs->event_thread->inf->aspace.get (), |
d37e0847 PA |
6481 | ecs->event_thread->stop_pc (), |
6482 | ecs->event_thread, ecs->ws); | |
795e548f | 6483 | |
c65d6b55 PA |
6484 | if (handle_stop_requested (ecs)) |
6485 | return; | |
6486 | ||
04e68871 | 6487 | /* If no catchpoint triggered for this, then keep going. */ |
ce12b012 | 6488 | if (!bpstat_causes_stop (ecs->event_thread->control.stop_bpstat)) |
04e68871 | 6489 | { |
1edb66d8 | 6490 | ecs->event_thread->set_stop_signal (GDB_SIGNAL_0); |
04e68871 DJ |
6491 | keep_going (ecs); |
6492 | return; | |
6493 | } | |
94c57d6a PA |
6494 | process_event_stop_test (ecs); |
6495 | return; | |
488f131b | 6496 | |
b4dc5ffa | 6497 | /* Be careful not to try to gather much state about a thread |
dda83cd7 | 6498 | that's in a syscall. It's frequently a losing proposition. */ |
488f131b | 6499 | case TARGET_WAITKIND_SYSCALL_ENTRY: |
1777feb0 | 6500 | /* Getting the current syscall number. */ |
94c57d6a PA |
6501 | if (handle_syscall_event (ecs) == 0) |
6502 | process_event_stop_test (ecs); | |
6503 | return; | |
c906108c | 6504 | |
488f131b | 6505 | /* Before examining the threads further, step this thread to |
dda83cd7 SM |
6506 | get it entirely out of the syscall. (We get notice of the |
6507 | event when the thread is just on the verge of exiting a | |
6508 | syscall. Stepping one instruction seems to get it back | |
6509 | into user code.) */ | |
488f131b | 6510 | case TARGET_WAITKIND_SYSCALL_RETURN: |
94c57d6a PA |
6511 | if (handle_syscall_event (ecs) == 0) |
6512 | process_event_stop_test (ecs); | |
6513 | return; | |
c906108c | 6514 | |
488f131b | 6515 | case TARGET_WAITKIND_STOPPED: |
4f5d7f63 PA |
6516 | handle_signal_stop (ecs); |
6517 | return; | |
c906108c | 6518 | |
b2175913 MS |
6519 | case TARGET_WAITKIND_NO_HISTORY: |
6520 | /* Reverse execution: target ran out of history info. */ | |
eab402df | 6521 | |
d1988021 | 6522 | /* Switch to the stopped thread. */ |
00431a78 | 6523 | context_switch (ecs); |
1eb8556f | 6524 | infrun_debug_printf ("stopped"); |
d1988021 | 6525 | |
34b7e8a6 | 6526 | delete_just_stopped_threads_single_step_breakpoints (); |
1edb66d8 SM |
6527 | ecs->event_thread->set_stop_pc |
6528 | (regcache_read_pc (get_thread_regcache (inferior_thread ()))); | |
c65d6b55 PA |
6529 | |
6530 | if (handle_stop_requested (ecs)) | |
6531 | return; | |
6532 | ||
2e5dbfab | 6533 | interps_notify_no_history (); |
22bcd14b | 6534 | stop_waiting (ecs); |
b2175913 | 6535 | return; |
488f131b | 6536 | } |
4f5d7f63 PA |
6537 | } |
6538 | ||
372316f1 | 6539 | /* Restart threads back to what they were trying to do back when we |
148cf134 SM |
6540 | paused them (because of an in-line step-over or vfork, for example). |
6541 | The EVENT_THREAD thread is ignored (not restarted). | |
6542 | ||
6543 | If INF is non-nullptr, only resume threads from INF. */ | |
4d9d9d04 PA |
6544 | |
6545 | static void | |
148cf134 | 6546 | restart_threads (struct thread_info *event_thread, inferior *inf) |
372316f1 | 6547 | { |
148cf134 SM |
6548 | INFRUN_SCOPED_DEBUG_START_END ("event_thread=%s, inf=%d", |
6549 | event_thread->ptid.to_string ().c_str (), | |
6550 | inf != nullptr ? inf->num : -1); | |
6551 | ||
2b718529 LS |
6552 | gdb_assert (!step_over_info_valid_p ()); |
6553 | ||
372316f1 PA |
6554 | /* In case the instruction just stepped spawned a new thread. */ |
6555 | update_thread_list (); | |
6556 | ||
08036331 | 6557 | for (thread_info *tp : all_non_exited_threads ()) |
372316f1 | 6558 | { |
148cf134 SM |
6559 | if (inf != nullptr && tp->inf != inf) |
6560 | continue; | |
6561 | ||
ac7d717c PA |
6562 | if (tp->inf->detaching) |
6563 | { | |
6564 | infrun_debug_printf ("restart threads: [%s] inferior detaching", | |
0fab7955 | 6565 | tp->ptid.to_string ().c_str ()); |
ac7d717c PA |
6566 | continue; |
6567 | } | |
6568 | ||
f3f8ece4 PA |
6569 | switch_to_thread_no_regs (tp); |
6570 | ||
372316f1 PA |
6571 | if (tp == event_thread) |
6572 | { | |
1eb8556f | 6573 | infrun_debug_printf ("restart threads: [%s] is event thread", |
0fab7955 | 6574 | tp->ptid.to_string ().c_str ()); |
372316f1 PA |
6575 | continue; |
6576 | } | |
6577 | ||
6578 | if (!(tp->state == THREAD_RUNNING || tp->control.in_infcall)) | |
6579 | { | |
1eb8556f | 6580 | infrun_debug_printf ("restart threads: [%s] not meant to be running", |
0fab7955 | 6581 | tp->ptid.to_string ().c_str ()); |
372316f1 PA |
6582 | continue; |
6583 | } | |
6584 | ||
7846f3aa | 6585 | if (tp->resumed ()) |
372316f1 | 6586 | { |
1eb8556f | 6587 | infrun_debug_printf ("restart threads: [%s] resumed", |
0fab7955 | 6588 | tp->ptid.to_string ().c_str ()); |
611841bb | 6589 | gdb_assert (tp->executing () || tp->has_pending_waitstatus ()); |
372316f1 PA |
6590 | continue; |
6591 | } | |
6592 | ||
6593 | if (thread_is_in_step_over_chain (tp)) | |
6594 | { | |
1eb8556f | 6595 | infrun_debug_printf ("restart threads: [%s] needs step-over", |
0fab7955 | 6596 | tp->ptid.to_string ().c_str ()); |
7846f3aa | 6597 | gdb_assert (!tp->resumed ()); |
372316f1 PA |
6598 | continue; |
6599 | } | |
6600 | ||
6601 | ||
1edb66d8 | 6602 | if (tp->has_pending_waitstatus ()) |
372316f1 | 6603 | { |
1eb8556f | 6604 | infrun_debug_printf ("restart threads: [%s] has pending status", |
0fab7955 | 6605 | tp->ptid.to_string ().c_str ()); |
7846f3aa | 6606 | tp->set_resumed (true); |
372316f1 PA |
6607 | continue; |
6608 | } | |
6609 | ||
c65d6b55 PA |
6610 | gdb_assert (!tp->stop_requested); |
6611 | ||
372316f1 PA |
6612 | /* If some thread needs to start a step-over at this point, it |
6613 | should still be in the step-over queue, and thus skipped | |
6614 | above. */ | |
6615 | if (thread_still_needs_step_over (tp)) | |
6616 | { | |
f34652de | 6617 | internal_error ("thread [%s] needs a step-over, but not in " |
372316f1 | 6618 | "step-over queue\n", |
0fab7955 | 6619 | tp->ptid.to_string ().c_str ()); |
372316f1 PA |
6620 | } |
6621 | ||
6622 | if (currently_stepping (tp)) | |
6623 | { | |
1eb8556f | 6624 | infrun_debug_printf ("restart threads: [%s] was stepping", |
0fab7955 | 6625 | tp->ptid.to_string ().c_str ()); |
372316f1 PA |
6626 | keep_going_stepped_thread (tp); |
6627 | } | |
6628 | else | |
6629 | { | |
1eb8556f | 6630 | infrun_debug_printf ("restart threads: [%s] continuing", |
0fab7955 | 6631 | tp->ptid.to_string ().c_str ()); |
aa563d16 | 6632 | execution_control_state ecs (tp); |
00431a78 | 6633 | switch_to_thread (tp); |
aa563d16 | 6634 | keep_going_pass_signal (&ecs); |
372316f1 PA |
6635 | } |
6636 | } | |
6637 | } | |
6638 | ||
6639 | /* Callback for iterate_over_threads. Find a resumed thread that has | |
6640 | a pending waitstatus. */ | |
6641 | ||
6642 | static int | |
6643 | resumed_thread_with_pending_status (struct thread_info *tp, | |
6644 | void *arg) | |
6645 | { | |
1edb66d8 | 6646 | return tp->resumed () && tp->has_pending_waitstatus (); |
372316f1 PA |
6647 | } |
6648 | ||
6649 | /* Called when we get an event that may finish an in-line or | |
6650 | out-of-line (displaced stepping) step-over started previously. | |
6651 | Return true if the event is processed and we should go back to the | |
6652 | event loop; false if the caller should continue processing the | |
6653 | event. */ | |
6654 | ||
6655 | static int | |
4d9d9d04 PA |
6656 | finish_step_over (struct execution_control_state *ecs) |
6657 | { | |
58c01087 | 6658 | displaced_step_finish (ecs->event_thread, ecs->ws); |
4d9d9d04 | 6659 | |
c4464ade | 6660 | bool had_step_over_info = step_over_info_valid_p (); |
372316f1 PA |
6661 | |
6662 | if (had_step_over_info) | |
4d9d9d04 PA |
6663 | { |
6664 | /* If we're stepping over a breakpoint with all threads locked, | |
6665 | then only the thread that was stepped should be reporting | |
6666 | back an event. */ | |
6667 | gdb_assert (ecs->event_thread->control.trap_expected); | |
6668 | ||
21d48304 | 6669 | update_thread_events_after_step_over (ecs->event_thread, ecs->ws); |
65c459ab | 6670 | |
c65d6b55 | 6671 | clear_step_over_info (); |
4d9d9d04 PA |
6672 | } |
6673 | ||
fbea99ea | 6674 | if (!target_is_non_stop_p ()) |
372316f1 | 6675 | return 0; |
4d9d9d04 PA |
6676 | |
6677 | /* Start a new step-over in another thread if there's one that | |
6678 | needs it. */ | |
6679 | start_step_over (); | |
372316f1 PA |
6680 | |
6681 | /* If we were stepping over a breakpoint before, and haven't started | |
6682 | a new in-line step-over sequence, then restart all other threads | |
6683 | (except the event thread). We can't do this in all-stop, as then | |
6684 | e.g., we wouldn't be able to issue any other remote packet until | |
6685 | these other threads stop. */ | |
6686 | if (had_step_over_info && !step_over_info_valid_p ()) | |
6687 | { | |
6688 | struct thread_info *pending; | |
6689 | ||
6690 | /* If we only have threads with pending statuses, the restart | |
6691 | below won't restart any thread and so nothing re-inserts the | |
6692 | breakpoint we just stepped over. But we need it inserted | |
6693 | when we later process the pending events, otherwise if | |
6694 | another thread has a pending event for this breakpoint too, | |
6695 | we'd discard its event (because the breakpoint that | |
6696 | originally caused the event was no longer inserted). */ | |
00431a78 | 6697 | context_switch (ecs); |
372316f1 PA |
6698 | insert_breakpoints (); |
6699 | ||
6700 | restart_threads (ecs->event_thread); | |
6701 | ||
6702 | /* If we have events pending, go through handle_inferior_event | |
6703 | again, picking up a pending event at random. This avoids | |
6704 | thread starvation. */ | |
6705 | ||
6706 | /* But not if we just stepped over a watchpoint in order to let | |
6707 | the instruction execute so we can evaluate its expression. | |
6708 | The set of watchpoints that triggered is recorded in the | |
6709 | breakpoint objects themselves (see bp->watchpoint_triggered). | |
6710 | If we processed another event first, that other event could | |
6711 | clobber this info. */ | |
6712 | if (ecs->event_thread->stepping_over_watchpoint) | |
6713 | return 0; | |
6714 | ||
21d48304 PA |
6715 | /* The code below is meant to avoid one thread hogging the event |
6716 | loop by doing constant in-line step overs. If the stepping | |
6717 | thread exited, there's no risk for this to happen, so we can | |
6718 | safely let our caller process the event immediately. */ | |
6719 | if (ecs->ws.kind () == TARGET_WAITKIND_THREAD_EXITED) | |
6720 | return 0; | |
6721 | ||
372316f1 | 6722 | pending = iterate_over_threads (resumed_thread_with_pending_status, |
03acd4d8 CL |
6723 | nullptr); |
6724 | if (pending != nullptr) | |
372316f1 PA |
6725 | { |
6726 | struct thread_info *tp = ecs->event_thread; | |
6727 | struct regcache *regcache; | |
6728 | ||
1eb8556f SM |
6729 | infrun_debug_printf ("found resumed threads with " |
6730 | "pending events, saving status"); | |
372316f1 PA |
6731 | |
6732 | gdb_assert (pending != tp); | |
6733 | ||
6734 | /* Record the event thread's event for later. */ | |
c272a98c | 6735 | save_waitstatus (tp, ecs->ws); |
372316f1 PA |
6736 | /* This was cleared early, by handle_inferior_event. Set it |
6737 | so this pending event is considered by | |
6738 | do_target_wait. */ | |
7846f3aa | 6739 | tp->set_resumed (true); |
372316f1 | 6740 | |
611841bb | 6741 | gdb_assert (!tp->executing ()); |
372316f1 | 6742 | |
00431a78 | 6743 | regcache = get_thread_regcache (tp); |
1edb66d8 | 6744 | tp->set_stop_pc (regcache_read_pc (regcache)); |
372316f1 | 6745 | |
1eb8556f SM |
6746 | infrun_debug_printf ("saved stop_pc=%s for %s " |
6747 | "(currently_stepping=%d)", | |
99d9c3b9 SM |
6748 | paddress (current_inferior ()->arch (), |
6749 | tp->stop_pc ()), | |
0fab7955 | 6750 | tp->ptid.to_string ().c_str (), |
1eb8556f | 6751 | currently_stepping (tp)); |
372316f1 PA |
6752 | |
6753 | /* This in-line step-over finished; clear this so we won't | |
6754 | start a new one. This is what handle_signal_stop would | |
6755 | do, if we returned false. */ | |
6756 | tp->stepping_over_breakpoint = 0; | |
6757 | ||
6758 | /* Wake up the event loop again. */ | |
6759 | mark_async_event_handler (infrun_async_inferior_event_token); | |
6760 | ||
6761 | prepare_to_wait (ecs); | |
6762 | return 1; | |
6763 | } | |
6764 | } | |
6765 | ||
6766 | return 0; | |
4d9d9d04 PA |
6767 | } |
6768 | ||
3f75a984 SM |
6769 | /* See infrun.h. */ |
6770 | ||
6771 | void | |
6772 | notify_signal_received (gdb_signal sig) | |
6773 | { | |
6774 | interps_notify_signal_received (sig); | |
6775 | gdb::observers::signal_received.notify (sig); | |
6776 | } | |
6777 | ||
87829267 SM |
6778 | /* See infrun.h. */ |
6779 | ||
6780 | void | |
6781 | notify_normal_stop (bpstat *bs, int print_frame) | |
6782 | { | |
6783 | interps_notify_normal_stop (bs, print_frame); | |
6784 | gdb::observers::normal_stop.notify (bs, print_frame); | |
6785 | } | |
6786 | ||
77cd03e2 SM |
6787 | /* See infrun.h. */ |
6788 | ||
6789 | void notify_user_selected_context_changed (user_selected_what selection) | |
6790 | { | |
6791 | interps_notify_user_selected_context_changed (selection); | |
6792 | gdb::observers::user_selected_context_changed.notify (selection); | |
6793 | } | |
6794 | ||
4f5d7f63 PA |
6795 | /* Come here when the program has stopped with a signal. */ |
6796 | ||
6797 | static void | |
6798 | handle_signal_stop (struct execution_control_state *ecs) | |
6799 | { | |
bd2b40ac | 6800 | frame_info_ptr frame; |
4f5d7f63 PA |
6801 | struct gdbarch *gdbarch; |
6802 | int stopped_by_watchpoint; | |
6803 | enum stop_kind stop_soon; | |
6804 | int random_signal; | |
c906108c | 6805 | |
183be222 | 6806 | gdb_assert (ecs->ws.kind () == TARGET_WAITKIND_STOPPED); |
f0407826 | 6807 | |
183be222 | 6808 | ecs->event_thread->set_stop_signal (ecs->ws.sig ()); |
c65d6b55 | 6809 | |
f0407826 DE |
6810 | /* Do we need to clean up the state of a thread that has |
6811 | completed a displaced single-step? (Doing so usually affects | |
6812 | the PC, so do it here, before we set stop_pc.) */ | |
372316f1 PA |
6813 | if (finish_step_over (ecs)) |
6814 | return; | |
f0407826 DE |
6815 | |
6816 | /* If we either finished a single-step or hit a breakpoint, but | |
6817 | the user wanted this thread to be stopped, pretend we got a | |
6818 | SIG0 (generic unsignaled stop). */ | |
6819 | if (ecs->event_thread->stop_requested | |
1edb66d8 SM |
6820 | && ecs->event_thread->stop_signal () == GDB_SIGNAL_TRAP) |
6821 | ecs->event_thread->set_stop_signal (GDB_SIGNAL_0); | |
237fc4c9 | 6822 | |
1edb66d8 SM |
6823 | ecs->event_thread->set_stop_pc |
6824 | (regcache_read_pc (get_thread_regcache (ecs->event_thread))); | |
488f131b | 6825 | |
2ab76a18 PA |
6826 | context_switch (ecs); |
6827 | ||
6828 | if (deprecated_context_hook) | |
6829 | deprecated_context_hook (ecs->event_thread->global_num); | |
6830 | ||
527159b7 | 6831 | if (debug_infrun) |
237fc4c9 | 6832 | { |
00431a78 | 6833 | struct regcache *regcache = get_thread_regcache (ecs->event_thread); |
b926417a | 6834 | struct gdbarch *reg_gdbarch = regcache->arch (); |
7f82dfc7 | 6835 | |
1edb66d8 SM |
6836 | infrun_debug_printf |
6837 | ("stop_pc=%s", paddress (reg_gdbarch, ecs->event_thread->stop_pc ())); | |
d92524f1 | 6838 | if (target_stopped_by_watchpoint ()) |
237fc4c9 | 6839 | { |
dda83cd7 | 6840 | CORE_ADDR addr; |
abbb1732 | 6841 | |
1eb8556f | 6842 | infrun_debug_printf ("stopped by watchpoint"); |
237fc4c9 | 6843 | |
328d42d8 SM |
6844 | if (target_stopped_data_address (current_inferior ()->top_target (), |
6845 | &addr)) | |
1eb8556f | 6846 | infrun_debug_printf ("stopped data address=%s", |
dda83cd7 SM |
6847 | paddress (reg_gdbarch, addr)); |
6848 | else | |
1eb8556f | 6849 | infrun_debug_printf ("(no data address available)"); |
237fc4c9 PA |
6850 | } |
6851 | } | |
527159b7 | 6852 | |
36fa8042 PA |
6853 | /* This is originated from start_remote(), start_inferior() and |
6854 | shared libraries hook functions. */ | |
00431a78 | 6855 | stop_soon = get_inferior_stop_soon (ecs); |
36fa8042 PA |
6856 | if (stop_soon == STOP_QUIETLY || stop_soon == STOP_QUIETLY_REMOTE) |
6857 | { | |
1eb8556f | 6858 | infrun_debug_printf ("quietly stopped"); |
c4464ade | 6859 | stop_print_frame = true; |
22bcd14b | 6860 | stop_waiting (ecs); |
36fa8042 PA |
6861 | return; |
6862 | } | |
6863 | ||
36fa8042 PA |
6864 | /* This originates from attach_command(). We need to overwrite |
6865 | the stop_signal here, because some kernels don't ignore a | |
6866 | SIGSTOP in a subsequent ptrace(PTRACE_CONT,SIGSTOP) call. | |
6867 | See more comments in inferior.h. On the other hand, if we | |
6868 | get a non-SIGSTOP, report it to the user - assume the backend | |
6869 | will handle the SIGSTOP if it should show up later. | |
6870 | ||
6871 | Also consider that the attach is complete when we see a | |
6872 | SIGTRAP. Some systems (e.g. Windows), and stubs supporting | |
6873 | target extended-remote report it instead of a SIGSTOP | |
6874 | (e.g. gdbserver). We already rely on SIGTRAP being our | |
6875 | signal, so this is no exception. | |
6876 | ||
6877 | Also consider that the attach is complete when we see a | |
6878 | GDB_SIGNAL_0. In non-stop mode, GDB will explicitly tell | |
6879 | the target to stop all threads of the inferior, in case the | |
6880 | low level attach operation doesn't stop them implicitly. If | |
6881 | they weren't stopped implicitly, then the stub will report a | |
6882 | GDB_SIGNAL_0, meaning: stopped for no particular reason | |
6883 | other than GDB's request. */ | |
6884 | if (stop_soon == STOP_QUIETLY_NO_SIGSTOP | |
1edb66d8 SM |
6885 | && (ecs->event_thread->stop_signal () == GDB_SIGNAL_STOP |
6886 | || ecs->event_thread->stop_signal () == GDB_SIGNAL_TRAP | |
6887 | || ecs->event_thread->stop_signal () == GDB_SIGNAL_0)) | |
36fa8042 | 6888 | { |
c4464ade | 6889 | stop_print_frame = true; |
22bcd14b | 6890 | stop_waiting (ecs); |
1edb66d8 | 6891 | ecs->event_thread->set_stop_signal (GDB_SIGNAL_0); |
36fa8042 PA |
6892 | return; |
6893 | } | |
6894 | ||
568d6575 UW |
6895 | /* At this point, get hold of the now-current thread's frame. */ |
6896 | frame = get_current_frame (); | |
6897 | gdbarch = get_frame_arch (frame); | |
6898 | ||
2adfaa28 | 6899 | /* Pull the single step breakpoints out of the target. */ |
1edb66d8 | 6900 | if (ecs->event_thread->stop_signal () == GDB_SIGNAL_TRAP) |
488f131b | 6901 | { |
af48d08f | 6902 | struct regcache *regcache; |
af48d08f | 6903 | CORE_ADDR pc; |
2adfaa28 | 6904 | |
00431a78 | 6905 | regcache = get_thread_regcache (ecs->event_thread); |
f9582a22 | 6906 | const address_space *aspace = ecs->event_thread->inf->aspace.get (); |
8b86c959 | 6907 | |
af48d08f | 6908 | pc = regcache_read_pc (regcache); |
34b7e8a6 | 6909 | |
af48d08f PA |
6910 | /* However, before doing so, if this single-step breakpoint was |
6911 | actually for another thread, set this thread up for moving | |
6912 | past it. */ | |
6913 | if (!thread_has_single_step_breakpoint_here (ecs->event_thread, | |
6914 | aspace, pc)) | |
6915 | { | |
6916 | if (single_step_breakpoint_inserted_here_p (aspace, pc)) | |
2adfaa28 | 6917 | { |
1eb8556f SM |
6918 | infrun_debug_printf ("[%s] hit another thread's single-step " |
6919 | "breakpoint", | |
0fab7955 | 6920 | ecs->ptid.to_string ().c_str ()); |
af48d08f PA |
6921 | ecs->hit_singlestep_breakpoint = 1; |
6922 | } | |
6923 | } | |
6924 | else | |
6925 | { | |
1eb8556f | 6926 | infrun_debug_printf ("[%s] hit its single-step breakpoint", |
0fab7955 | 6927 | ecs->ptid.to_string ().c_str ()); |
2adfaa28 | 6928 | } |
488f131b | 6929 | } |
af48d08f | 6930 | delete_just_stopped_threads_single_step_breakpoints (); |
c906108c | 6931 | |
1edb66d8 | 6932 | if (ecs->event_thread->stop_signal () == GDB_SIGNAL_TRAP |
963f9c80 PA |
6933 | && ecs->event_thread->control.trap_expected |
6934 | && ecs->event_thread->stepping_over_watchpoint) | |
d983da9c DJ |
6935 | stopped_by_watchpoint = 0; |
6936 | else | |
c272a98c | 6937 | stopped_by_watchpoint = watchpoints_triggered (ecs->ws); |
d983da9c DJ |
6938 | |
6939 | /* If necessary, step over this watchpoint. We'll be back to display | |
6940 | it in a moment. */ | |
6941 | if (stopped_by_watchpoint | |
9aed480c | 6942 | && (target_have_steppable_watchpoint () |
568d6575 | 6943 | || gdbarch_have_nonsteppable_watchpoint (gdbarch))) |
488f131b | 6944 | { |
488f131b | 6945 | /* At this point, we are stopped at an instruction which has |
dda83cd7 SM |
6946 | attempted to write to a piece of memory under control of |
6947 | a watchpoint. The instruction hasn't actually executed | |
6948 | yet. If we were to evaluate the watchpoint expression | |
6949 | now, we would get the old value, and therefore no change | |
6950 | would seem to have occurred. | |
6951 | ||
6952 | In order to make watchpoints work `right', we really need | |
6953 | to complete the memory write, and then evaluate the | |
6954 | watchpoint expression. We do this by single-stepping the | |
d983da9c DJ |
6955 | target. |
6956 | ||
7f89fd65 | 6957 | It may not be necessary to disable the watchpoint to step over |
d983da9c DJ |
6958 | it. For example, the PA can (with some kernel cooperation) |
6959 | single step over a watchpoint without disabling the watchpoint. | |
6960 | ||
6961 | It is far more common to need to disable a watchpoint to step | |
6962 | the inferior over it. If we have non-steppable watchpoints, | |
6963 | we must disable the current watchpoint; it's simplest to | |
963f9c80 PA |
6964 | disable all watchpoints. |
6965 | ||
6966 | Any breakpoint at PC must also be stepped over -- if there's | |
6967 | one, it will have already triggered before the watchpoint | |
6968 | triggered, and we either already reported it to the user, or | |
6969 | it didn't cause a stop and we called keep_going. In either | |
6970 | case, if there was a breakpoint at PC, we must be trying to | |
6971 | step past it. */ | |
6972 | ecs->event_thread->stepping_over_watchpoint = 1; | |
6973 | keep_going (ecs); | |
488f131b JB |
6974 | return; |
6975 | } | |
6976 | ||
4e1c45ea | 6977 | ecs->event_thread->stepping_over_breakpoint = 0; |
963f9c80 | 6978 | ecs->event_thread->stepping_over_watchpoint = 0; |
16c381f0 JK |
6979 | bpstat_clear (&ecs->event_thread->control.stop_bpstat); |
6980 | ecs->event_thread->control.stop_step = 0; | |
c4464ade | 6981 | stop_print_frame = true; |
488f131b | 6982 | stopped_by_random_signal = 0; |
313f3b21 | 6983 | bpstat *stop_chain = nullptr; |
488f131b | 6984 | |
edb3359d DJ |
6985 | /* Hide inlined functions starting here, unless we just performed stepi or |
6986 | nexti. After stepi and nexti, always show the innermost frame (not any | |
6987 | inline function call sites). */ | |
16c381f0 | 6988 | if (ecs->event_thread->control.step_range_end != 1) |
0574c78f | 6989 | { |
f9582a22 | 6990 | const address_space *aspace = ecs->event_thread->inf->aspace.get (); |
0574c78f GB |
6991 | |
6992 | /* skip_inline_frames is expensive, so we avoid it if we can | |
6993 | determine that the address is one where functions cannot have | |
6994 | been inlined. This improves performance with inferiors that | |
6995 | load a lot of shared libraries, because the solib event | |
6996 | breakpoint is defined as the address of a function (i.e. not | |
6997 | inline). Note that we have to check the previous PC as well | |
6998 | as the current one to catch cases when we have just | |
6999 | single-stepped off a breakpoint prior to reinstating it. | |
7000 | Note that we're assuming that the code we single-step to is | |
7001 | not inline, but that's not definitive: there's nothing | |
7002 | preventing the event breakpoint function from containing | |
7003 | inlined code, and the single-step ending up there. If the | |
7004 | user had set a breakpoint on that inlined code, the missing | |
7005 | skip_inline_frames call would break things. Fortunately | |
7006 | that's an extremely unlikely scenario. */ | |
f2ffa92b | 7007 | if (!pc_at_non_inline_function (aspace, |
1edb66d8 | 7008 | ecs->event_thread->stop_pc (), |
c272a98c | 7009 | ecs->ws) |
1edb66d8 | 7010 | && !(ecs->event_thread->stop_signal () == GDB_SIGNAL_TRAP |
a210c238 MR |
7011 | && ecs->event_thread->control.trap_expected |
7012 | && pc_at_non_inline_function (aspace, | |
7013 | ecs->event_thread->prev_pc, | |
c272a98c | 7014 | ecs->ws))) |
1c5a993e | 7015 | { |
f2ffa92b | 7016 | stop_chain = build_bpstat_chain (aspace, |
1edb66d8 | 7017 | ecs->event_thread->stop_pc (), |
c272a98c | 7018 | ecs->ws); |
00431a78 | 7019 | skip_inline_frames (ecs->event_thread, stop_chain); |
1c5a993e MR |
7020 | |
7021 | /* Re-fetch current thread's frame in case that invalidated | |
7022 | the frame cache. */ | |
7023 | frame = get_current_frame (); | |
7024 | gdbarch = get_frame_arch (frame); | |
7025 | } | |
0574c78f | 7026 | } |
edb3359d | 7027 | |
1edb66d8 | 7028 | if (ecs->event_thread->stop_signal () == GDB_SIGNAL_TRAP |
16c381f0 | 7029 | && ecs->event_thread->control.trap_expected |
568d6575 | 7030 | && gdbarch_single_step_through_delay_p (gdbarch) |
4e1c45ea | 7031 | && currently_stepping (ecs->event_thread)) |
3352ef37 | 7032 | { |
b50d7442 | 7033 | /* We're trying to step off a breakpoint. Turns out that we're |
3352ef37 | 7034 | also on an instruction that needs to be stepped multiple |
1777feb0 | 7035 | times before it's been fully executing. E.g., architectures |
3352ef37 AC |
7036 | with a delay slot. It needs to be stepped twice, once for |
7037 | the instruction and once for the delay slot. */ | |
7038 | int step_through_delay | |
568d6575 | 7039 | = gdbarch_single_step_through_delay (gdbarch, frame); |
abbb1732 | 7040 | |
1eb8556f SM |
7041 | if (step_through_delay) |
7042 | infrun_debug_printf ("step through delay"); | |
7043 | ||
16c381f0 JK |
7044 | if (ecs->event_thread->control.step_range_end == 0 |
7045 | && step_through_delay) | |
3352ef37 AC |
7046 | { |
7047 | /* The user issued a continue when stopped at a breakpoint. | |
7048 | Set up for another trap and get out of here. */ | |
dda83cd7 SM |
7049 | ecs->event_thread->stepping_over_breakpoint = 1; |
7050 | keep_going (ecs); | |
7051 | return; | |
3352ef37 AC |
7052 | } |
7053 | else if (step_through_delay) | |
7054 | { | |
7055 | /* The user issued a step when stopped at a breakpoint. | |
7056 | Maybe we should stop, maybe we should not - the delay | |
7057 | slot *might* correspond to a line of source. In any | |
ca67fcb8 VP |
7058 | case, don't decide that here, just set |
7059 | ecs->stepping_over_breakpoint, making sure we | |
7060 | single-step again before breakpoints are re-inserted. */ | |
4e1c45ea | 7061 | ecs->event_thread->stepping_over_breakpoint = 1; |
3352ef37 AC |
7062 | } |
7063 | } | |
7064 | ||
ab04a2af TT |
7065 | /* See if there is a breakpoint/watchpoint/catchpoint/etc. that |
7066 | handles this event. */ | |
7067 | ecs->event_thread->control.stop_bpstat | |
f9582a22 | 7068 | = bpstat_stop_status (ecs->event_thread->inf->aspace.get (), |
1edb66d8 | 7069 | ecs->event_thread->stop_pc (), |
c272a98c | 7070 | ecs->event_thread, ecs->ws, stop_chain); |
db82e815 | 7071 | |
ab04a2af TT |
7072 | /* Following in case break condition called a |
7073 | function. */ | |
c4464ade | 7074 | stop_print_frame = true; |
73dd234f | 7075 | |
ab04a2af TT |
7076 | /* This is where we handle "moribund" watchpoints. Unlike |
7077 | software breakpoints traps, hardware watchpoint traps are | |
7078 | always distinguishable from random traps. If no high-level | |
7079 | watchpoint is associated with the reported stop data address | |
7080 | anymore, then the bpstat does not explain the signal --- | |
7081 | simply make sure to ignore it if `stopped_by_watchpoint' is | |
7082 | set. */ | |
7083 | ||
1edb66d8 | 7084 | if (ecs->event_thread->stop_signal () == GDB_SIGNAL_TRAP |
47591c29 | 7085 | && !bpstat_explains_signal (ecs->event_thread->control.stop_bpstat, |
427cd150 | 7086 | GDB_SIGNAL_TRAP) |
ab04a2af | 7087 | && stopped_by_watchpoint) |
1eb8556f SM |
7088 | { |
7089 | infrun_debug_printf ("no user watchpoint explains watchpoint SIGTRAP, " | |
7090 | "ignoring"); | |
7091 | } | |
73dd234f | 7092 | |
bac7d97b | 7093 | /* NOTE: cagney/2003-03-29: These checks for a random signal |
ab04a2af TT |
7094 | at one stage in the past included checks for an inferior |
7095 | function call's call dummy's return breakpoint. The original | |
7096 | comment, that went with the test, read: | |
03cebad2 | 7097 | |
ab04a2af TT |
7098 | ``End of a stack dummy. Some systems (e.g. Sony news) give |
7099 | another signal besides SIGTRAP, so check here as well as | |
7100 | above.'' | |
73dd234f | 7101 | |
ab04a2af TT |
7102 | If someone ever tries to get call dummys on a |
7103 | non-executable stack to work (where the target would stop | |
7104 | with something like a SIGSEGV), then those tests might need | |
7105 | to be re-instated. Given, however, that the tests were only | |
7106 | enabled when momentary breakpoints were not being used, I | |
7107 | suspect that it won't be the case. | |
488f131b | 7108 | |
ab04a2af TT |
7109 | NOTE: kettenis/2004-02-05: Indeed such checks don't seem to |
7110 | be necessary for call dummies on a non-executable stack on | |
7111 | SPARC. */ | |
488f131b | 7112 | |
bac7d97b | 7113 | /* See if the breakpoints module can explain the signal. */ |
47591c29 PA |
7114 | random_signal |
7115 | = !bpstat_explains_signal (ecs->event_thread->control.stop_bpstat, | |
1edb66d8 | 7116 | ecs->event_thread->stop_signal ()); |
bac7d97b | 7117 | |
1cf4d951 PA |
7118 | /* Maybe this was a trap for a software breakpoint that has since |
7119 | been removed. */ | |
7120 | if (random_signal && target_stopped_by_sw_breakpoint ()) | |
7121 | { | |
5133a315 | 7122 | if (gdbarch_program_breakpoint_here_p (gdbarch, |
1edb66d8 | 7123 | ecs->event_thread->stop_pc ())) |
1cf4d951 PA |
7124 | { |
7125 | struct regcache *regcache; | |
7126 | int decr_pc; | |
7127 | ||
7128 | /* Re-adjust PC to what the program would see if GDB was not | |
7129 | debugging it. */ | |
00431a78 | 7130 | regcache = get_thread_regcache (ecs->event_thread); |
527a273a | 7131 | decr_pc = gdbarch_decr_pc_after_break (gdbarch); |
1cf4d951 PA |
7132 | if (decr_pc != 0) |
7133 | { | |
6b09f134 | 7134 | std::optional<scoped_restore_tmpl<int>> |
07036511 | 7135 | restore_operation_disable; |
1cf4d951 PA |
7136 | |
7137 | if (record_full_is_used ()) | |
07036511 TT |
7138 | restore_operation_disable.emplace |
7139 | (record_full_gdb_operation_disable_set ()); | |
1cf4d951 | 7140 | |
f2ffa92b | 7141 | regcache_write_pc (regcache, |
1edb66d8 | 7142 | ecs->event_thread->stop_pc () + decr_pc); |
1cf4d951 PA |
7143 | } |
7144 | } | |
7145 | else | |
7146 | { | |
7147 | /* A delayed software breakpoint event. Ignore the trap. */ | |
1eb8556f | 7148 | infrun_debug_printf ("delayed software breakpoint trap, ignoring"); |
1cf4d951 PA |
7149 | random_signal = 0; |
7150 | } | |
7151 | } | |
7152 | ||
7153 | /* Maybe this was a trap for a hardware breakpoint/watchpoint that | |
7154 | has since been removed. */ | |
7155 | if (random_signal && target_stopped_by_hw_breakpoint ()) | |
7156 | { | |
7157 | /* A delayed hardware breakpoint event. Ignore the trap. */ | |
1eb8556f SM |
7158 | infrun_debug_printf ("delayed hardware breakpoint/watchpoint " |
7159 | "trap, ignoring"); | |
1cf4d951 PA |
7160 | random_signal = 0; |
7161 | } | |
7162 | ||
bac7d97b PA |
7163 | /* If not, perhaps stepping/nexting can. */ |
7164 | if (random_signal) | |
1edb66d8 | 7165 | random_signal = !(ecs->event_thread->stop_signal () == GDB_SIGNAL_TRAP |
bac7d97b | 7166 | && currently_stepping (ecs->event_thread)); |
ab04a2af | 7167 | |
2adfaa28 PA |
7168 | /* Perhaps the thread hit a single-step breakpoint of _another_ |
7169 | thread. Single-step breakpoints are transparent to the | |
7170 | breakpoints module. */ | |
7171 | if (random_signal) | |
7172 | random_signal = !ecs->hit_singlestep_breakpoint; | |
7173 | ||
bac7d97b PA |
7174 | /* No? Perhaps we got a moribund watchpoint. */ |
7175 | if (random_signal) | |
7176 | random_signal = !stopped_by_watchpoint; | |
ab04a2af | 7177 | |
c65d6b55 PA |
7178 | /* Always stop if the user explicitly requested this thread to |
7179 | remain stopped. */ | |
7180 | if (ecs->event_thread->stop_requested) | |
7181 | { | |
7182 | random_signal = 1; | |
1eb8556f | 7183 | infrun_debug_printf ("user-requested stop"); |
c65d6b55 PA |
7184 | } |
7185 | ||
488f131b JB |
7186 | /* For the program's own signals, act according to |
7187 | the signal handling tables. */ | |
7188 | ||
ce12b012 | 7189 | if (random_signal) |
488f131b JB |
7190 | { |
7191 | /* Signal not for debugging purposes. */ | |
1edb66d8 | 7192 | enum gdb_signal stop_signal = ecs->event_thread->stop_signal (); |
488f131b | 7193 | |
1eb8556f SM |
7194 | infrun_debug_printf ("random signal (%s)", |
7195 | gdb_signal_to_symbol_string (stop_signal)); | |
527159b7 | 7196 | |
488f131b JB |
7197 | stopped_by_random_signal = 1; |
7198 | ||
252fbfc8 PA |
7199 | /* Always stop on signals if we're either just gaining control |
7200 | of the program, or the user explicitly requested this thread | |
7201 | to remain stopped. */ | |
d6b48e9c | 7202 | if (stop_soon != NO_STOP_QUIETLY |
252fbfc8 | 7203 | || ecs->event_thread->stop_requested |
1edb66d8 | 7204 | || signal_stop_state (ecs->event_thread->stop_signal ())) |
488f131b | 7205 | { |
22bcd14b | 7206 | stop_waiting (ecs); |
488f131b JB |
7207 | return; |
7208 | } | |
b57bacec PA |
7209 | |
7210 | /* Notify observers the signal has "handle print" set. Note we | |
7211 | returned early above if stopping; normal_stop handles the | |
7212 | printing in that case. */ | |
1edb66d8 | 7213 | if (signal_print[ecs->event_thread->stop_signal ()]) |
b57bacec PA |
7214 | { |
7215 | /* The signal table tells us to print about this signal. */ | |
223ffa71 | 7216 | target_terminal::ours_for_output (); |
3f75a984 | 7217 | notify_signal_received (ecs->event_thread->stop_signal ()); |
223ffa71 | 7218 | target_terminal::inferior (); |
b57bacec | 7219 | } |
488f131b JB |
7220 | |
7221 | /* Clear the signal if it should not be passed. */ | |
1edb66d8 SM |
7222 | if (signal_program[ecs->event_thread->stop_signal ()] == 0) |
7223 | ecs->event_thread->set_stop_signal (GDB_SIGNAL_0); | |
488f131b | 7224 | |
1edb66d8 | 7225 | if (ecs->event_thread->prev_pc == ecs->event_thread->stop_pc () |
16c381f0 | 7226 | && ecs->event_thread->control.trap_expected |
03acd4d8 | 7227 | && ecs->event_thread->control.step_resume_breakpoint == nullptr) |
68f53502 AC |
7228 | { |
7229 | /* We were just starting a new sequence, attempting to | |
7230 | single-step off of a breakpoint and expecting a SIGTRAP. | |
237fc4c9 | 7231 | Instead this signal arrives. This signal will take us out |
68f53502 AC |
7232 | of the stepping range so GDB needs to remember to, when |
7233 | the signal handler returns, resume stepping off that | |
7234 | breakpoint. */ | |
7235 | /* To simplify things, "continue" is forced to use the same | |
7236 | code paths as single-step - set a breakpoint at the | |
7237 | signal return address and then, once hit, step off that | |
7238 | breakpoint. */ | |
1eb8556f | 7239 | infrun_debug_printf ("signal arrived while stepping over breakpoint"); |
d3169d93 | 7240 | |
2c03e5be | 7241 | insert_hp_step_resume_breakpoint_at_frame (frame); |
4e1c45ea | 7242 | ecs->event_thread->step_after_step_resume_breakpoint = 1; |
2455069d UW |
7243 | /* Reset trap_expected to ensure breakpoints are re-inserted. */ |
7244 | ecs->event_thread->control.trap_expected = 0; | |
d137e6dc PA |
7245 | |
7246 | /* If we were nexting/stepping some other thread, switch to | |
7247 | it, so that we don't continue it, losing control. */ | |
7248 | if (!switch_back_to_stepped_thread (ecs)) | |
7249 | keep_going (ecs); | |
9d799f85 | 7250 | return; |
68f53502 | 7251 | } |
9d799f85 | 7252 | |
1edb66d8 SM |
7253 | if (ecs->event_thread->stop_signal () != GDB_SIGNAL_0 |
7254 | && (pc_in_thread_step_range (ecs->event_thread->stop_pc (), | |
f2ffa92b | 7255 | ecs->event_thread) |
e5f8a7cc | 7256 | || ecs->event_thread->control.step_range_end == 1) |
a0cbd650 TT |
7257 | && (get_stack_frame_id (frame) |
7258 | == ecs->event_thread->control.step_stack_frame_id) | |
03acd4d8 | 7259 | && ecs->event_thread->control.step_resume_breakpoint == nullptr) |
d303a6c7 AC |
7260 | { |
7261 | /* The inferior is about to take a signal that will take it | |
7262 | out of the single step range. Set a breakpoint at the | |
7263 | current PC (which is presumably where the signal handler | |
7264 | will eventually return) and then allow the inferior to | |
7265 | run free. | |
7266 | ||
7267 | Note that this is only needed for a signal delivered | |
7268 | while in the single-step range. Nested signals aren't a | |
7269 | problem as they eventually all return. */ | |
1eb8556f | 7270 | infrun_debug_printf ("signal may take us out of single-step range"); |
237fc4c9 | 7271 | |
372316f1 | 7272 | clear_step_over_info (); |
2c03e5be | 7273 | insert_hp_step_resume_breakpoint_at_frame (frame); |
e5f8a7cc | 7274 | ecs->event_thread->step_after_step_resume_breakpoint = 1; |
2455069d UW |
7275 | /* Reset trap_expected to ensure breakpoints are re-inserted. */ |
7276 | ecs->event_thread->control.trap_expected = 0; | |
9d799f85 AC |
7277 | keep_going (ecs); |
7278 | return; | |
d303a6c7 | 7279 | } |
9d799f85 | 7280 | |
85102364 | 7281 | /* Note: step_resume_breakpoint may be non-NULL. This occurs |
9d799f85 AC |
7282 | when either there's a nested signal, or when there's a |
7283 | pending signal enabled just as the signal handler returns | |
7284 | (leaving the inferior at the step-resume-breakpoint without | |
7285 | actually executing it). Either way continue until the | |
7286 | breakpoint is really hit. */ | |
c447ac0b PA |
7287 | |
7288 | if (!switch_back_to_stepped_thread (ecs)) | |
7289 | { | |
1eb8556f | 7290 | infrun_debug_printf ("random signal, keep going"); |
c447ac0b PA |
7291 | |
7292 | keep_going (ecs); | |
7293 | } | |
7294 | return; | |
488f131b | 7295 | } |
94c57d6a PA |
7296 | |
7297 | process_event_stop_test (ecs); | |
7298 | } | |
7299 | ||
fe6356de CL |
7300 | /* Return the address for the beginning of the line. */ |
7301 | ||
7302 | CORE_ADDR | |
7303 | update_line_range_start (CORE_ADDR pc, struct execution_control_state *ecs) | |
7304 | { | |
7305 | /* The line table may have multiple entries for the same source code line. | |
7306 | Given the PC, check the line table and return the PC that corresponds | |
7307 | to the line table entry for the source line that PC is in. */ | |
7308 | CORE_ADDR start_line_pc = ecs->event_thread->control.step_range_start; | |
7309 | std::optional<CORE_ADDR> real_range_start; | |
7310 | ||
7311 | /* Call find_line_range_start to get the smallest address in the | |
7312 | linetable for multiple Line X entries in the line table. */ | |
7313 | real_range_start = find_line_range_start (pc); | |
7314 | ||
7315 | if (real_range_start.has_value ()) | |
7316 | start_line_pc = *real_range_start; | |
7317 | ||
7318 | return start_line_pc; | |
7319 | } | |
7320 | ||
94c57d6a PA |
7321 | /* Come here when we've got some debug event / signal we can explain |
7322 | (IOW, not a random signal), and test whether it should cause a | |
7323 | stop, or whether we should resume the inferior (transparently). | |
7324 | E.g., could be a breakpoint whose condition evaluates false; we | |
7325 | could be still stepping within the line; etc. */ | |
7326 | ||
7327 | static void | |
7328 | process_event_stop_test (struct execution_control_state *ecs) | |
7329 | { | |
7330 | struct symtab_and_line stop_pc_sal; | |
bd2b40ac | 7331 | frame_info_ptr frame; |
94c57d6a | 7332 | struct gdbarch *gdbarch; |
cdaa5b73 PA |
7333 | CORE_ADDR jmp_buf_pc; |
7334 | struct bpstat_what what; | |
94c57d6a | 7335 | |
cdaa5b73 | 7336 | /* Handle cases caused by hitting a breakpoint. */ |
611c83ae | 7337 | |
cdaa5b73 PA |
7338 | frame = get_current_frame (); |
7339 | gdbarch = get_frame_arch (frame); | |
fcf3daef | 7340 | |
cdaa5b73 | 7341 | what = bpstat_what (ecs->event_thread->control.stop_bpstat); |
611c83ae | 7342 | |
cdaa5b73 PA |
7343 | if (what.call_dummy) |
7344 | { | |
7345 | stop_stack_dummy = what.call_dummy; | |
7346 | } | |
186c406b | 7347 | |
243a9253 PA |
7348 | /* A few breakpoint types have callbacks associated (e.g., |
7349 | bp_jit_event). Run them now. */ | |
7350 | bpstat_run_callbacks (ecs->event_thread->control.stop_bpstat); | |
7351 | ||
cdaa5b73 PA |
7352 | /* If we hit an internal event that triggers symbol changes, the |
7353 | current frame will be invalidated within bpstat_what (e.g., if we | |
7354 | hit an internal solib event). Re-fetch it. */ | |
7355 | frame = get_current_frame (); | |
7356 | gdbarch = get_frame_arch (frame); | |
e2e4d78b | 7357 | |
bf2813af GL |
7358 | /* Shorthand to make if statements smaller. */ |
7359 | struct frame_id original_frame_id | |
7360 | = ecs->event_thread->control.step_frame_id; | |
7361 | struct frame_id curr_frame_id = get_frame_id (get_current_frame ()); | |
7362 | ||
cdaa5b73 PA |
7363 | switch (what.main_action) |
7364 | { | |
7365 | case BPSTAT_WHAT_SET_LONGJMP_RESUME: | |
7366 | /* If we hit the breakpoint at longjmp while stepping, we | |
7367 | install a momentary breakpoint at the target of the | |
7368 | jmp_buf. */ | |
186c406b | 7369 | |
1eb8556f | 7370 | infrun_debug_printf ("BPSTAT_WHAT_SET_LONGJMP_RESUME"); |
186c406b | 7371 | |
cdaa5b73 | 7372 | ecs->event_thread->stepping_over_breakpoint = 1; |
611c83ae | 7373 | |
cdaa5b73 PA |
7374 | if (what.is_longjmp) |
7375 | { | |
7376 | struct value *arg_value; | |
7377 | ||
7378 | /* If we set the longjmp breakpoint via a SystemTap probe, | |
7379 | then use it to extract the arguments. The destination PC | |
7380 | is the third argument to the probe. */ | |
7381 | arg_value = probe_safe_evaluate_at_pc (frame, 2); | |
7382 | if (arg_value) | |
8fa0c4f8 AA |
7383 | { |
7384 | jmp_buf_pc = value_as_address (arg_value); | |
7385 | jmp_buf_pc = gdbarch_addr_bits_remove (gdbarch, jmp_buf_pc); | |
7386 | } | |
cdaa5b73 PA |
7387 | else if (!gdbarch_get_longjmp_target_p (gdbarch) |
7388 | || !gdbarch_get_longjmp_target (gdbarch, | |
7389 | frame, &jmp_buf_pc)) | |
e2e4d78b | 7390 | { |
1eb8556f SM |
7391 | infrun_debug_printf ("BPSTAT_WHAT_SET_LONGJMP_RESUME " |
7392 | "(!gdbarch_get_longjmp_target)"); | |
cdaa5b73 PA |
7393 | keep_going (ecs); |
7394 | return; | |
e2e4d78b | 7395 | } |
e2e4d78b | 7396 | |
cdaa5b73 PA |
7397 | /* Insert a breakpoint at resume address. */ |
7398 | insert_longjmp_resume_breakpoint (gdbarch, jmp_buf_pc); | |
7399 | } | |
7400 | else | |
7401 | check_exception_resume (ecs, frame); | |
7402 | keep_going (ecs); | |
7403 | return; | |
e81a37f7 | 7404 | |
cdaa5b73 PA |
7405 | case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME: |
7406 | { | |
bd2b40ac | 7407 | frame_info_ptr init_frame; |
e81a37f7 | 7408 | |
cdaa5b73 | 7409 | /* There are several cases to consider. |
c906108c | 7410 | |
cdaa5b73 PA |
7411 | 1. The initiating frame no longer exists. In this case we |
7412 | must stop, because the exception or longjmp has gone too | |
7413 | far. | |
2c03e5be | 7414 | |
cdaa5b73 PA |
7415 | 2. The initiating frame exists, and is the same as the |
7416 | current frame. We stop, because the exception or longjmp | |
7417 | has been caught. | |
2c03e5be | 7418 | |
cdaa5b73 PA |
7419 | 3. The initiating frame exists and is different from the |
7420 | current frame. This means the exception or longjmp has | |
7421 | been caught beneath the initiating frame, so keep going. | |
c906108c | 7422 | |
cdaa5b73 PA |
7423 | 4. longjmp breakpoint has been placed just to protect |
7424 | against stale dummy frames and user is not interested in | |
7425 | stopping around longjmps. */ | |
c5aa993b | 7426 | |
1eb8556f | 7427 | infrun_debug_printf ("BPSTAT_WHAT_CLEAR_LONGJMP_RESUME"); |
c5aa993b | 7428 | |
cdaa5b73 | 7429 | gdb_assert (ecs->event_thread->control.exception_resume_breakpoint |
03acd4d8 | 7430 | != nullptr); |
cdaa5b73 | 7431 | delete_exception_resume_breakpoint (ecs->event_thread); |
c5aa993b | 7432 | |
cdaa5b73 PA |
7433 | if (what.is_longjmp) |
7434 | { | |
b67a2c6f | 7435 | check_longjmp_breakpoint_for_call_dummy (ecs->event_thread); |
c5aa993b | 7436 | |
cdaa5b73 | 7437 | if (!frame_id_p (ecs->event_thread->initiating_frame)) |
e5ef252a | 7438 | { |
cdaa5b73 PA |
7439 | /* Case 4. */ |
7440 | keep_going (ecs); | |
7441 | return; | |
e5ef252a | 7442 | } |
cdaa5b73 | 7443 | } |
c5aa993b | 7444 | |
cdaa5b73 | 7445 | init_frame = frame_find_by_id (ecs->event_thread->initiating_frame); |
527159b7 | 7446 | |
cdaa5b73 PA |
7447 | if (init_frame) |
7448 | { | |
fb84fbf8 | 7449 | if (curr_frame_id == ecs->event_thread->initiating_frame) |
cdaa5b73 PA |
7450 | { |
7451 | /* Case 2. Fall through. */ | |
7452 | } | |
7453 | else | |
7454 | { | |
7455 | /* Case 3. */ | |
7456 | keep_going (ecs); | |
7457 | return; | |
7458 | } | |
68f53502 | 7459 | } |
488f131b | 7460 | |
cdaa5b73 PA |
7461 | /* For Cases 1 and 2, remove the step-resume breakpoint, if it |
7462 | exists. */ | |
7463 | delete_step_resume_breakpoint (ecs->event_thread); | |
e5ef252a | 7464 | |
bdc36728 | 7465 | end_stepping_range (ecs); |
cdaa5b73 PA |
7466 | } |
7467 | return; | |
e5ef252a | 7468 | |
cdaa5b73 | 7469 | case BPSTAT_WHAT_SINGLE: |
1eb8556f | 7470 | infrun_debug_printf ("BPSTAT_WHAT_SINGLE"); |
cdaa5b73 PA |
7471 | ecs->event_thread->stepping_over_breakpoint = 1; |
7472 | /* Still need to check other stuff, at least the case where we | |
7473 | are stepping and step out of the right range. */ | |
7474 | break; | |
e5ef252a | 7475 | |
cdaa5b73 | 7476 | case BPSTAT_WHAT_STEP_RESUME: |
1eb8556f | 7477 | infrun_debug_printf ("BPSTAT_WHAT_STEP_RESUME"); |
b22548dd | 7478 | |
b986eec5 CL |
7479 | delete_step_resume_breakpoint (ecs->event_thread); |
7480 | if (ecs->event_thread->control.proceed_to_finish | |
7481 | && execution_direction == EXEC_REVERSE) | |
cdaa5b73 PA |
7482 | { |
7483 | struct thread_info *tp = ecs->event_thread; | |
b22548dd | 7484 | |
b986eec5 CL |
7485 | /* We are finishing a function in reverse, and just hit the |
7486 | step-resume breakpoint at the start address of the | |
7487 | function, and we're almost there -- just need to back up | |
7488 | by one more single-step, which should take us back to the | |
7489 | function call. */ | |
7490 | tp->control.step_range_start = tp->control.step_range_end = 1; | |
7491 | keep_going (ecs); | |
7492 | return; | |
7493 | } | |
7494 | fill_in_stop_func (gdbarch, ecs); | |
7495 | if (ecs->event_thread->stop_pc () == ecs->stop_func_start | |
7496 | && execution_direction == EXEC_REVERSE) | |
7497 | { | |
7498 | /* We are stepping over a function call in reverse, and just | |
7499 | hit the step-resume breakpoint at the start address of | |
7500 | the function. Go back to single-stepping, which should | |
7501 | take us back to the function call. */ | |
7502 | ecs->event_thread->stepping_over_breakpoint = 1; | |
cdaa5b73 PA |
7503 | keep_going (ecs); |
7504 | return; | |
7505 | } | |
7506 | break; | |
e5ef252a | 7507 | |
cdaa5b73 | 7508 | case BPSTAT_WHAT_STOP_NOISY: |
1eb8556f | 7509 | infrun_debug_printf ("BPSTAT_WHAT_STOP_NOISY"); |
c4464ade | 7510 | stop_print_frame = true; |
e5ef252a | 7511 | |
33bf4c5c | 7512 | /* Assume the thread stopped for a breakpoint. We'll still check |
99619bea PA |
7513 | whether a/the breakpoint is there when the thread is next |
7514 | resumed. */ | |
7515 | ecs->event_thread->stepping_over_breakpoint = 1; | |
e5ef252a | 7516 | |
22bcd14b | 7517 | stop_waiting (ecs); |
cdaa5b73 | 7518 | return; |
e5ef252a | 7519 | |
cdaa5b73 | 7520 | case BPSTAT_WHAT_STOP_SILENT: |
1eb8556f | 7521 | infrun_debug_printf ("BPSTAT_WHAT_STOP_SILENT"); |
c4464ade | 7522 | stop_print_frame = false; |
e5ef252a | 7523 | |
33bf4c5c | 7524 | /* Assume the thread stopped for a breakpoint. We'll still check |
99619bea PA |
7525 | whether a/the breakpoint is there when the thread is next |
7526 | resumed. */ | |
7527 | ecs->event_thread->stepping_over_breakpoint = 1; | |
22bcd14b | 7528 | stop_waiting (ecs); |
cdaa5b73 PA |
7529 | return; |
7530 | ||
7531 | case BPSTAT_WHAT_HP_STEP_RESUME: | |
1eb8556f | 7532 | infrun_debug_printf ("BPSTAT_WHAT_HP_STEP_RESUME"); |
cdaa5b73 PA |
7533 | |
7534 | delete_step_resume_breakpoint (ecs->event_thread); | |
7535 | if (ecs->event_thread->step_after_step_resume_breakpoint) | |
7536 | { | |
7537 | /* Back when the step-resume breakpoint was inserted, we | |
7538 | were trying to single-step off a breakpoint. Go back to | |
7539 | doing that. */ | |
7540 | ecs->event_thread->step_after_step_resume_breakpoint = 0; | |
7541 | ecs->event_thread->stepping_over_breakpoint = 1; | |
7542 | keep_going (ecs); | |
7543 | return; | |
e5ef252a | 7544 | } |
cdaa5b73 PA |
7545 | break; |
7546 | ||
7547 | case BPSTAT_WHAT_KEEP_CHECKING: | |
7548 | break; | |
e5ef252a | 7549 | } |
c906108c | 7550 | |
af48d08f PA |
7551 | /* If we stepped a permanent breakpoint and we had a high priority |
7552 | step-resume breakpoint for the address we stepped, but we didn't | |
7553 | hit it, then we must have stepped into the signal handler. The | |
7554 | step-resume was only necessary to catch the case of _not_ | |
7555 | stepping into the handler, so delete it, and fall through to | |
7556 | checking whether the step finished. */ | |
7557 | if (ecs->event_thread->stepped_breakpoint) | |
7558 | { | |
7559 | struct breakpoint *sr_bp | |
7560 | = ecs->event_thread->control.step_resume_breakpoint; | |
7561 | ||
03acd4d8 | 7562 | if (sr_bp != nullptr |
f5951b9f | 7563 | && sr_bp->first_loc ().permanent |
af48d08f | 7564 | && sr_bp->type == bp_hp_step_resume |
f5951b9f | 7565 | && sr_bp->first_loc ().address == ecs->event_thread->prev_pc) |
af48d08f | 7566 | { |
1eb8556f | 7567 | infrun_debug_printf ("stepped permanent breakpoint, stopped in handler"); |
af48d08f PA |
7568 | delete_step_resume_breakpoint (ecs->event_thread); |
7569 | ecs->event_thread->step_after_step_resume_breakpoint = 0; | |
7570 | } | |
7571 | } | |
7572 | ||
cdaa5b73 PA |
7573 | /* We come here if we hit a breakpoint but should not stop for it. |
7574 | Possibly we also were stepping and should stop for that. So fall | |
7575 | through and test for stepping. But, if not stepping, do not | |
7576 | stop. */ | |
c906108c | 7577 | |
a7212384 UW |
7578 | /* In all-stop mode, if we're currently stepping but have stopped in |
7579 | some other thread, we need to switch back to the stepped thread. */ | |
c447ac0b PA |
7580 | if (switch_back_to_stepped_thread (ecs)) |
7581 | return; | |
776f04fa | 7582 | |
8358c15c | 7583 | if (ecs->event_thread->control.step_resume_breakpoint) |
488f131b | 7584 | { |
1eb8556f | 7585 | infrun_debug_printf ("step-resume breakpoint is inserted"); |
527159b7 | 7586 | |
488f131b | 7587 | /* Having a step-resume breakpoint overrides anything |
dda83cd7 SM |
7588 | else having to do with stepping commands until |
7589 | that breakpoint is reached. */ | |
488f131b JB |
7590 | keep_going (ecs); |
7591 | return; | |
7592 | } | |
c5aa993b | 7593 | |
16c381f0 | 7594 | if (ecs->event_thread->control.step_range_end == 0) |
488f131b | 7595 | { |
1eb8556f | 7596 | infrun_debug_printf ("no stepping, continue"); |
488f131b | 7597 | /* Likewise if we aren't even stepping. */ |
488f131b JB |
7598 | keep_going (ecs); |
7599 | return; | |
7600 | } | |
c5aa993b | 7601 | |
4b7703ad JB |
7602 | /* Re-fetch current thread's frame in case the code above caused |
7603 | the frame cache to be re-initialized, making our FRAME variable | |
7604 | a dangling pointer. */ | |
7605 | frame = get_current_frame (); | |
628fe4e4 | 7606 | gdbarch = get_frame_arch (frame); |
7e324e48 | 7607 | fill_in_stop_func (gdbarch, ecs); |
4b7703ad | 7608 | |
488f131b | 7609 | /* If stepping through a line, keep going if still within it. |
c906108c | 7610 | |
488f131b JB |
7611 | Note that step_range_end is the address of the first instruction |
7612 | beyond the step range, and NOT the address of the last instruction | |
31410e84 MS |
7613 | within it! |
7614 | ||
7615 | Note also that during reverse execution, we may be stepping | |
7616 | through a function epilogue and therefore must detect when | |
7617 | the current-frame changes in the middle of a line. */ | |
7618 | ||
1edb66d8 | 7619 | if (pc_in_thread_step_range (ecs->event_thread->stop_pc (), |
f2ffa92b | 7620 | ecs->event_thread) |
31410e84 | 7621 | && (execution_direction != EXEC_REVERSE |
fb84fbf8 | 7622 | || curr_frame_id == original_frame_id)) |
488f131b | 7623 | { |
1eb8556f SM |
7624 | infrun_debug_printf |
7625 | ("stepping inside range [%s-%s]", | |
7626 | paddress (gdbarch, ecs->event_thread->control.step_range_start), | |
7627 | paddress (gdbarch, ecs->event_thread->control.step_range_end)); | |
b2175913 | 7628 | |
c1e36e3e PA |
7629 | /* Tentatively re-enable range stepping; `resume' disables it if |
7630 | necessary (e.g., if we're stepping over a breakpoint or we | |
7631 | have software watchpoints). */ | |
7632 | ecs->event_thread->control.may_range_step = 1; | |
7633 | ||
b2175913 MS |
7634 | /* When stepping backward, stop at beginning of line range |
7635 | (unless it's the function entry point, in which case | |
7636 | keep going back to the call point). */ | |
1edb66d8 | 7637 | CORE_ADDR stop_pc = ecs->event_thread->stop_pc (); |
16c381f0 | 7638 | if (stop_pc == ecs->event_thread->control.step_range_start |
15d2b36c | 7639 | && stop_pc != ecs->stop_func_start |
b2175913 | 7640 | && execution_direction == EXEC_REVERSE) |
bdc36728 | 7641 | end_stepping_range (ecs); |
b2175913 MS |
7642 | else |
7643 | keep_going (ecs); | |
7644 | ||
488f131b JB |
7645 | return; |
7646 | } | |
c5aa993b | 7647 | |
488f131b | 7648 | /* We stepped out of the stepping range. */ |
c906108c | 7649 | |
488f131b | 7650 | /* If we are stepping at the source level and entered the runtime |
388a8562 MS |
7651 | loader dynamic symbol resolution code... |
7652 | ||
7653 | EXEC_FORWARD: we keep on single stepping until we exit the run | |
7654 | time loader code and reach the callee's address. | |
7655 | ||
7656 | EXEC_REVERSE: we've already executed the callee (backward), and | |
7657 | the runtime loader code is handled just like any other | |
7658 | undebuggable function call. Now we need only keep stepping | |
7659 | backward through the trampoline code, and that's handled further | |
7660 | down, so there is nothing for us to do here. */ | |
7661 | ||
7662 | if (execution_direction != EXEC_REVERSE | |
16c381f0 | 7663 | && ecs->event_thread->control.step_over_calls == STEP_OVER_UNDEBUGGABLE |
be6276e0 | 7664 | && in_solib_dynsym_resolve_code (ecs->event_thread->stop_pc ()) |
bafcc335 LS |
7665 | && (ecs->event_thread->control.step_start_function == nullptr |
7666 | || !in_solib_dynsym_resolve_code ( | |
7667 | ecs->event_thread->control.step_start_function->value_block () | |
7668 | ->entry_pc ()))) | |
488f131b | 7669 | { |
4c8c40e6 | 7670 | CORE_ADDR pc_after_resolver = |
1edb66d8 | 7671 | gdbarch_skip_solib_resolver (gdbarch, ecs->event_thread->stop_pc ()); |
c906108c | 7672 | |
1eb8556f | 7673 | infrun_debug_printf ("stepped into dynsym resolve code"); |
527159b7 | 7674 | |
488f131b JB |
7675 | if (pc_after_resolver) |
7676 | { | |
7677 | /* Set up a step-resume breakpoint at the address | |
7678 | indicated by SKIP_SOLIB_RESOLVER. */ | |
51abb421 | 7679 | symtab_and_line sr_sal; |
488f131b | 7680 | sr_sal.pc = pc_after_resolver; |
6c95b8df | 7681 | sr_sal.pspace = get_frame_program_space (frame); |
488f131b | 7682 | |
a6d9a66e UW |
7683 | insert_step_resume_breakpoint_at_sal (gdbarch, |
7684 | sr_sal, null_frame_id); | |
c5aa993b | 7685 | } |
c906108c | 7686 | |
488f131b JB |
7687 | keep_going (ecs); |
7688 | return; | |
7689 | } | |
c906108c | 7690 | |
1d509aa6 MM |
7691 | /* Step through an indirect branch thunk. */ |
7692 | if (ecs->event_thread->control.step_over_calls != STEP_OVER_NONE | |
f2ffa92b | 7693 | && gdbarch_in_indirect_branch_thunk (gdbarch, |
1edb66d8 | 7694 | ecs->event_thread->stop_pc ())) |
1d509aa6 | 7695 | { |
1eb8556f | 7696 | infrun_debug_printf ("stepped into indirect branch thunk"); |
1d509aa6 MM |
7697 | keep_going (ecs); |
7698 | return; | |
7699 | } | |
7700 | ||
16c381f0 JK |
7701 | if (ecs->event_thread->control.step_range_end != 1 |
7702 | && (ecs->event_thread->control.step_over_calls == STEP_OVER_UNDEBUGGABLE | |
7703 | || ecs->event_thread->control.step_over_calls == STEP_OVER_ALL) | |
568d6575 | 7704 | && get_frame_type (frame) == SIGTRAMP_FRAME) |
488f131b | 7705 | { |
1eb8556f | 7706 | infrun_debug_printf ("stepped into signal trampoline"); |
42edda50 | 7707 | /* The inferior, while doing a "step" or "next", has ended up in |
dda83cd7 SM |
7708 | a signal trampoline (either by a signal being delivered or by |
7709 | the signal handler returning). Just single-step until the | |
7710 | inferior leaves the trampoline (either by calling the handler | |
7711 | or returning). */ | |
488f131b JB |
7712 | keep_going (ecs); |
7713 | return; | |
7714 | } | |
c906108c | 7715 | |
14132e89 MR |
7716 | /* If we're in the return path from a shared library trampoline, |
7717 | we want to proceed through the trampoline when stepping. */ | |
7718 | /* macro/2012-04-25: This needs to come before the subroutine | |
7719 | call check below as on some targets return trampolines look | |
7720 | like subroutine calls (MIPS16 return thunks). */ | |
7721 | if (gdbarch_in_solib_return_trampoline (gdbarch, | |
1edb66d8 | 7722 | ecs->event_thread->stop_pc (), |
f2ffa92b | 7723 | ecs->stop_func_name) |
14132e89 MR |
7724 | && ecs->event_thread->control.step_over_calls != STEP_OVER_NONE) |
7725 | { | |
7726 | /* Determine where this trampoline returns. */ | |
1edb66d8 | 7727 | CORE_ADDR stop_pc = ecs->event_thread->stop_pc (); |
f2ffa92b PA |
7728 | CORE_ADDR real_stop_pc |
7729 | = gdbarch_skip_trampoline_code (gdbarch, frame, stop_pc); | |
14132e89 | 7730 | |
1eb8556f | 7731 | infrun_debug_printf ("stepped into solib return tramp"); |
14132e89 MR |
7732 | |
7733 | /* Only proceed through if we know where it's going. */ | |
7734 | if (real_stop_pc) | |
7735 | { | |
7736 | /* And put the step-breakpoint there and go until there. */ | |
51abb421 | 7737 | symtab_and_line sr_sal; |
14132e89 MR |
7738 | sr_sal.pc = real_stop_pc; |
7739 | sr_sal.section = find_pc_overlay (sr_sal.pc); | |
7740 | sr_sal.pspace = get_frame_program_space (frame); | |
7741 | ||
7742 | /* Do not specify what the fp should be when we stop since | |
7743 | on some machines the prologue is where the new fp value | |
7744 | is established. */ | |
7745 | insert_step_resume_breakpoint_at_sal (gdbarch, | |
7746 | sr_sal, null_frame_id); | |
7747 | ||
7748 | /* Restart without fiddling with the step ranges or | |
7749 | other state. */ | |
7750 | keep_going (ecs); | |
7751 | return; | |
7752 | } | |
7753 | } | |
7754 | ||
c17eaafe DJ |
7755 | /* Check for subroutine calls. The check for the current frame |
7756 | equalling the step ID is not necessary - the check of the | |
7757 | previous frame's ID is sufficient - but it is a common case and | |
7758 | cheaper than checking the previous frame's ID. | |
14e60db5 | 7759 | |
a0cbd650 | 7760 | NOTE: frame_id::operator== will never report two invalid frame IDs as |
14e60db5 DJ |
7761 | being equal, so to get into this block, both the current and |
7762 | previous frame must have valid frame IDs. */ | |
005ca36a JB |
7763 | /* The outer_frame_id check is a heuristic to detect stepping |
7764 | through startup code. If we step over an instruction which | |
7765 | sets the stack pointer from an invalid value to a valid value, | |
7766 | we may detect that as a subroutine call from the mythical | |
7767 | "outermost" function. This could be fixed by marking | |
7768 | outermost frames as !stack_p,code_p,special_p. Then the | |
7769 | initial outermost frame, before sp was valid, would | |
a0cbd650 | 7770 | have code_addr == &_start. See the comment in frame_id::operator== |
005ca36a | 7771 | for more. */ |
1bd70cb9 CL |
7772 | |
7773 | /* We want "nexti" to step into, not over, signal handlers invoked | |
7774 | by the kernel, therefore this subroutine check should not trigger | |
7775 | for a signal handler invocation. On most platforms, this is already | |
7776 | not the case, as the kernel puts a signal trampoline frame onto the | |
7777 | stack to handle proper return after the handler, and therefore at this | |
7778 | point, the current frame is a grandchild of the step frame, not a | |
7779 | child. However, on some platforms, the kernel actually uses a | |
7780 | trampoline to handle *invocation* of the handler. In that case, | |
7781 | when executing the first instruction of the trampoline, this check | |
7782 | would erroneously detect the trampoline invocation as a subroutine | |
7783 | call. Fix this by checking for SIGTRAMP_FRAME. */ | |
a0cbd650 TT |
7784 | if ((get_stack_frame_id (frame) |
7785 | != ecs->event_thread->control.step_stack_frame_id) | |
1bd70cb9 | 7786 | && get_frame_type (frame) != SIGTRAMP_FRAME |
a0cbd650 TT |
7787 | && ((frame_unwind_caller_id (get_current_frame ()) |
7788 | == ecs->event_thread->control.step_stack_frame_id) | |
7789 | && ((ecs->event_thread->control.step_stack_frame_id | |
7790 | != outer_frame_id) | |
885eeb5b | 7791 | || (ecs->event_thread->control.step_start_function |
1edb66d8 | 7792 | != find_pc_function (ecs->event_thread->stop_pc ()))))) |
488f131b | 7793 | { |
1edb66d8 | 7794 | CORE_ADDR stop_pc = ecs->event_thread->stop_pc (); |
95918acb | 7795 | CORE_ADDR real_stop_pc; |
8fb3e588 | 7796 | |
1eb8556f | 7797 | infrun_debug_printf ("stepped into subroutine"); |
527159b7 | 7798 | |
b7a084be | 7799 | if (ecs->event_thread->control.step_over_calls == STEP_OVER_NONE) |
95918acb AC |
7800 | { |
7801 | /* I presume that step_over_calls is only 0 when we're | |
7802 | supposed to be stepping at the assembly language level | |
7803 | ("stepi"). Just stop. */ | |
388a8562 | 7804 | /* And this works the same backward as frontward. MVS */ |
bdc36728 | 7805 | end_stepping_range (ecs); |
95918acb AC |
7806 | return; |
7807 | } | |
8fb3e588 | 7808 | |
388a8562 MS |
7809 | /* Reverse stepping through solib trampolines. */ |
7810 | ||
7811 | if (execution_direction == EXEC_REVERSE | |
16c381f0 | 7812 | && ecs->event_thread->control.step_over_calls != STEP_OVER_NONE |
388a8562 MS |
7813 | && (gdbarch_skip_trampoline_code (gdbarch, frame, stop_pc) |
7814 | || (ecs->stop_func_start == 0 | |
7815 | && in_solib_dynsym_resolve_code (stop_pc)))) | |
7816 | { | |
7817 | /* Any solib trampoline code can be handled in reverse | |
7818 | by simply continuing to single-step. We have already | |
7819 | executed the solib function (backwards), and a few | |
7820 | steps will take us back through the trampoline to the | |
7821 | caller. */ | |
7822 | keep_going (ecs); | |
7823 | return; | |
7824 | } | |
7825 | ||
16c381f0 | 7826 | if (ecs->event_thread->control.step_over_calls == STEP_OVER_ALL) |
8567c30f | 7827 | { |
b2175913 MS |
7828 | /* We're doing a "next". |
7829 | ||
7830 | Normal (forward) execution: set a breakpoint at the | |
7831 | callee's return address (the address at which the caller | |
7832 | will resume). | |
7833 | ||
7834 | Reverse (backward) execution. set the step-resume | |
7835 | breakpoint at the start of the function that we just | |
7836 | stepped into (backwards), and continue to there. When we | |
6130d0b7 | 7837 | get there, we'll need to single-step back to the caller. */ |
b2175913 MS |
7838 | |
7839 | if (execution_direction == EXEC_REVERSE) | |
7840 | { | |
acf9414f JK |
7841 | /* If we're already at the start of the function, we've either |
7842 | just stepped backward into a single instruction function, | |
7843 | or stepped back out of a signal handler to the first instruction | |
7844 | of the function. Just keep going, which will single-step back | |
7845 | to the caller. */ | |
58c48e72 | 7846 | if (ecs->stop_func_start != stop_pc && ecs->stop_func_start != 0) |
acf9414f | 7847 | { |
acf9414f | 7848 | /* Normal function call return (static or dynamic). */ |
51abb421 | 7849 | symtab_and_line sr_sal; |
acf9414f JK |
7850 | sr_sal.pc = ecs->stop_func_start; |
7851 | sr_sal.pspace = get_frame_program_space (frame); | |
7852 | insert_step_resume_breakpoint_at_sal (gdbarch, | |
1f3e37e0 | 7853 | sr_sal, get_stack_frame_id (frame)); |
acf9414f | 7854 | } |
b2175913 MS |
7855 | } |
7856 | else | |
568d6575 | 7857 | insert_step_resume_breakpoint_at_caller (frame); |
b2175913 | 7858 | |
8567c30f AC |
7859 | keep_going (ecs); |
7860 | return; | |
7861 | } | |
a53c66de | 7862 | |
95918acb | 7863 | /* If we are in a function call trampoline (a stub between the |
dda83cd7 SM |
7864 | calling routine and the real function), locate the real |
7865 | function. That's what tells us (a) whether we want to step | |
7866 | into it at all, and (b) what prologue we want to run to the | |
7867 | end of, if we do step into it. */ | |
568d6575 | 7868 | real_stop_pc = skip_language_trampoline (frame, stop_pc); |
95918acb | 7869 | if (real_stop_pc == 0) |
568d6575 | 7870 | real_stop_pc = gdbarch_skip_trampoline_code (gdbarch, frame, stop_pc); |
95918acb AC |
7871 | if (real_stop_pc != 0) |
7872 | ecs->stop_func_start = real_stop_pc; | |
8fb3e588 | 7873 | |
db5f024e | 7874 | if (real_stop_pc != 0 && in_solib_dynsym_resolve_code (real_stop_pc)) |
1b2bfbb9 | 7875 | { |
51abb421 | 7876 | symtab_and_line sr_sal; |
1b2bfbb9 | 7877 | sr_sal.pc = ecs->stop_func_start; |
6c95b8df | 7878 | sr_sal.pspace = get_frame_program_space (frame); |
1b2bfbb9 | 7879 | |
a6d9a66e UW |
7880 | insert_step_resume_breakpoint_at_sal (gdbarch, |
7881 | sr_sal, null_frame_id); | |
8fb3e588 AC |
7882 | keep_going (ecs); |
7883 | return; | |
1b2bfbb9 RC |
7884 | } |
7885 | ||
95918acb | 7886 | /* If we have line number information for the function we are |
1bfeeb0f JL |
7887 | thinking of stepping into and the function isn't on the skip |
7888 | list, step into it. | |
95918acb | 7889 | |
dda83cd7 SM |
7890 | If there are several symtabs at that PC (e.g. with include |
7891 | files), just want to know whether *any* of them have line | |
7892 | numbers. find_pc_line handles this. */ | |
95918acb AC |
7893 | { |
7894 | struct symtab_and_line tmp_sal; | |
8fb3e588 | 7895 | |
95918acb | 7896 | tmp_sal = find_pc_line (ecs->stop_func_start, 0); |
2b914b52 | 7897 | if (tmp_sal.line != 0 |
85817405 | 7898 | && !function_name_is_marked_for_skip (ecs->stop_func_name, |
4a4c04f1 BE |
7899 | tmp_sal) |
7900 | && !inline_frame_is_marked_for_skip (true, ecs->event_thread)) | |
95918acb | 7901 | { |
b2175913 | 7902 | if (execution_direction == EXEC_REVERSE) |
568d6575 | 7903 | handle_step_into_function_backward (gdbarch, ecs); |
b2175913 | 7904 | else |
568d6575 | 7905 | handle_step_into_function (gdbarch, ecs); |
95918acb AC |
7906 | return; |
7907 | } | |
7908 | } | |
7909 | ||
7910 | /* If we have no line number and the step-stop-if-no-debug is | |
dda83cd7 SM |
7911 | set, we stop the step so that the user has a chance to switch |
7912 | in assembly mode. */ | |
16c381f0 | 7913 | if (ecs->event_thread->control.step_over_calls == STEP_OVER_UNDEBUGGABLE |
078130d0 | 7914 | && step_stop_if_no_debug) |
95918acb | 7915 | { |
bdc36728 | 7916 | end_stepping_range (ecs); |
95918acb AC |
7917 | return; |
7918 | } | |
7919 | ||
b2175913 MS |
7920 | if (execution_direction == EXEC_REVERSE) |
7921 | { | |
acf9414f JK |
7922 | /* If we're already at the start of the function, we've either just |
7923 | stepped backward into a single instruction function without line | |
7924 | number info, or stepped back out of a signal handler to the first | |
7925 | instruction of the function without line number info. Just keep | |
7926 | going, which will single-step back to the caller. */ | |
7927 | if (ecs->stop_func_start != stop_pc) | |
7928 | { | |
7929 | /* Set a breakpoint at callee's start address. | |
7930 | From there we can step once and be back in the caller. */ | |
51abb421 | 7931 | symtab_and_line sr_sal; |
acf9414f JK |
7932 | sr_sal.pc = ecs->stop_func_start; |
7933 | sr_sal.pspace = get_frame_program_space (frame); | |
7934 | insert_step_resume_breakpoint_at_sal (gdbarch, | |
7935 | sr_sal, null_frame_id); | |
7936 | } | |
b2175913 MS |
7937 | } |
7938 | else | |
7939 | /* Set a breakpoint at callee's return address (the address | |
7940 | at which the caller will resume). */ | |
568d6575 | 7941 | insert_step_resume_breakpoint_at_caller (frame); |
b2175913 | 7942 | |
95918acb | 7943 | keep_going (ecs); |
488f131b | 7944 | return; |
488f131b | 7945 | } |
c906108c | 7946 | |
fdd654f3 MS |
7947 | /* Reverse stepping through solib trampolines. */ |
7948 | ||
7949 | if (execution_direction == EXEC_REVERSE | |
16c381f0 | 7950 | && ecs->event_thread->control.step_over_calls != STEP_OVER_NONE) |
fdd654f3 | 7951 | { |
1edb66d8 | 7952 | CORE_ADDR stop_pc = ecs->event_thread->stop_pc (); |
f2ffa92b | 7953 | |
fdd654f3 MS |
7954 | if (gdbarch_skip_trampoline_code (gdbarch, frame, stop_pc) |
7955 | || (ecs->stop_func_start == 0 | |
7956 | && in_solib_dynsym_resolve_code (stop_pc))) | |
7957 | { | |
7958 | /* Any solib trampoline code can be handled in reverse | |
7959 | by simply continuing to single-step. We have already | |
7960 | executed the solib function (backwards), and a few | |
7961 | steps will take us back through the trampoline to the | |
7962 | caller. */ | |
7963 | keep_going (ecs); | |
7964 | return; | |
7965 | } | |
7966 | else if (in_solib_dynsym_resolve_code (stop_pc)) | |
7967 | { | |
7968 | /* Stepped backward into the solib dynsym resolver. | |
7969 | Set a breakpoint at its start and continue, then | |
7970 | one more step will take us out. */ | |
51abb421 | 7971 | symtab_and_line sr_sal; |
fdd654f3 | 7972 | sr_sal.pc = ecs->stop_func_start; |
9d1807c3 | 7973 | sr_sal.pspace = get_frame_program_space (frame); |
fdd654f3 MS |
7974 | insert_step_resume_breakpoint_at_sal (gdbarch, |
7975 | sr_sal, null_frame_id); | |
7976 | keep_going (ecs); | |
7977 | return; | |
7978 | } | |
7979 | } | |
7980 | ||
8c95582d AB |
7981 | /* This always returns the sal for the inner-most frame when we are in a |
7982 | stack of inlined frames, even if GDB actually believes that it is in a | |
7983 | more outer frame. This is checked for below by calls to | |
7984 | inline_skipped_frames. */ | |
1edb66d8 | 7985 | stop_pc_sal = find_pc_line (ecs->event_thread->stop_pc (), 0); |
7ed0fe66 | 7986 | |
1b2bfbb9 RC |
7987 | /* NOTE: tausq/2004-05-24: This if block used to be done before all |
7988 | the trampoline processing logic, however, there are some trampolines | |
7989 | that have no names, so we should do trampoline handling first. */ | |
16c381f0 | 7990 | if (ecs->event_thread->control.step_over_calls == STEP_OVER_UNDEBUGGABLE |
03acd4d8 | 7991 | && ecs->stop_func_name == nullptr |
2afb61aa | 7992 | && stop_pc_sal.line == 0) |
1b2bfbb9 | 7993 | { |
1eb8556f | 7994 | infrun_debug_printf ("stepped into undebuggable function"); |
527159b7 | 7995 | |
1b2bfbb9 | 7996 | /* The inferior just stepped into, or returned to, an |
dda83cd7 SM |
7997 | undebuggable function (where there is no debugging information |
7998 | and no line number corresponding to the address where the | |
7999 | inferior stopped). Since we want to skip this kind of code, | |
8000 | we keep going until the inferior returns from this | |
8001 | function - unless the user has asked us not to (via | |
8002 | set step-mode) or we no longer know how to get back | |
8003 | to the call site. */ | |
14e60db5 | 8004 | if (step_stop_if_no_debug |
c7ce8faa | 8005 | || !frame_id_p (frame_unwind_caller_id (frame))) |
1b2bfbb9 RC |
8006 | { |
8007 | /* If we have no line number and the step-stop-if-no-debug | |
8008 | is set, we stop the step so that the user has a chance to | |
8009 | switch in assembly mode. */ | |
bdc36728 | 8010 | end_stepping_range (ecs); |
1b2bfbb9 RC |
8011 | return; |
8012 | } | |
8013 | else | |
8014 | { | |
8015 | /* Set a breakpoint at callee's return address (the address | |
8016 | at which the caller will resume). */ | |
568d6575 | 8017 | insert_step_resume_breakpoint_at_caller (frame); |
1b2bfbb9 RC |
8018 | keep_going (ecs); |
8019 | return; | |
8020 | } | |
8021 | } | |
8022 | ||
2a8339b7 CL |
8023 | if (execution_direction == EXEC_REVERSE |
8024 | && ecs->event_thread->control.proceed_to_finish | |
8025 | && ecs->event_thread->stop_pc () >= ecs->stop_func_alt_start | |
8026 | && ecs->event_thread->stop_pc () < ecs->stop_func_start) | |
8027 | { | |
8028 | /* We are executing the reverse-finish command. | |
8029 | If the system supports multiple entry points and we are finishing a | |
3bfdcabb | 8030 | function in reverse. If we are between the entry points single-step |
2a8339b7 CL |
8031 | back to the alternate entry point. If we are at the alternate entry |
8032 | point -- just need to back up by one more single-step, which | |
8033 | should take us back to the function call. */ | |
8034 | ecs->event_thread->control.step_range_start | |
8035 | = ecs->event_thread->control.step_range_end = 1; | |
8036 | keep_going (ecs); | |
8037 | return; | |
8038 | ||
8039 | } | |
8040 | ||
16c381f0 | 8041 | if (ecs->event_thread->control.step_range_end == 1) |
1b2bfbb9 RC |
8042 | { |
8043 | /* It is stepi or nexti. We always want to stop stepping after | |
dda83cd7 | 8044 | one instruction. */ |
1eb8556f | 8045 | infrun_debug_printf ("stepi/nexti"); |
bdc36728 | 8046 | end_stepping_range (ecs); |
1b2bfbb9 RC |
8047 | return; |
8048 | } | |
8049 | ||
2afb61aa | 8050 | if (stop_pc_sal.line == 0) |
488f131b JB |
8051 | { |
8052 | /* We have no line number information. That means to stop | |
dda83cd7 SM |
8053 | stepping (does this always happen right after one instruction, |
8054 | when we do "s" in a function with no line numbers, | |
8055 | or can this happen as a result of a return or longjmp?). */ | |
1eb8556f | 8056 | infrun_debug_printf ("line number info"); |
bdc36728 | 8057 | end_stepping_range (ecs); |
488f131b JB |
8058 | return; |
8059 | } | |
c906108c | 8060 | |
edb3359d DJ |
8061 | /* Look for "calls" to inlined functions, part one. If the inline |
8062 | frame machinery detected some skipped call sites, we have entered | |
8063 | a new inline function. */ | |
8064 | ||
fb84fbf8 | 8065 | if ((curr_frame_id == original_frame_id) |
00431a78 | 8066 | && inline_skipped_frames (ecs->event_thread)) |
edb3359d | 8067 | { |
1eb8556f | 8068 | infrun_debug_printf ("stepped into inlined function"); |
edb3359d | 8069 | |
51abb421 | 8070 | symtab_and_line call_sal = find_frame_sal (get_current_frame ()); |
edb3359d | 8071 | |
16c381f0 | 8072 | if (ecs->event_thread->control.step_over_calls != STEP_OVER_ALL) |
edb3359d DJ |
8073 | { |
8074 | /* For "step", we're going to stop. But if the call site | |
8075 | for this inlined function is on the same source line as | |
8076 | we were previously stepping, go down into the function | |
8077 | first. Otherwise stop at the call site. */ | |
8078 | ||
8079 | if (call_sal.line == ecs->event_thread->current_line | |
8080 | && call_sal.symtab == ecs->event_thread->current_symtab) | |
4a4c04f1 BE |
8081 | { |
8082 | step_into_inline_frame (ecs->event_thread); | |
8083 | if (inline_frame_is_marked_for_skip (false, ecs->event_thread)) | |
8084 | { | |
8085 | keep_going (ecs); | |
8086 | return; | |
8087 | } | |
8088 | } | |
edb3359d | 8089 | |
bdc36728 | 8090 | end_stepping_range (ecs); |
edb3359d DJ |
8091 | return; |
8092 | } | |
8093 | else | |
8094 | { | |
8095 | /* For "next", we should stop at the call site if it is on a | |
8096 | different source line. Otherwise continue through the | |
8097 | inlined function. */ | |
8098 | if (call_sal.line == ecs->event_thread->current_line | |
8099 | && call_sal.symtab == ecs->event_thread->current_symtab) | |
8100 | keep_going (ecs); | |
8101 | else | |
bdc36728 | 8102 | end_stepping_range (ecs); |
edb3359d DJ |
8103 | return; |
8104 | } | |
8105 | } | |
8106 | ||
8107 | /* Look for "calls" to inlined functions, part two. If we are still | |
8108 | in the same real function we were stepping through, but we have | |
8109 | to go further up to find the exact frame ID, we are stepping | |
8110 | through a more inlined call beyond its call site. */ | |
8111 | ||
8112 | if (get_frame_type (get_current_frame ()) == INLINE_FRAME | |
fb84fbf8 GL |
8113 | && (curr_frame_id != original_frame_id) |
8114 | && stepped_in_from (get_current_frame (), original_frame_id)) | |
edb3359d | 8115 | { |
1eb8556f | 8116 | infrun_debug_printf ("stepping through inlined function"); |
edb3359d | 8117 | |
4a4c04f1 BE |
8118 | if (ecs->event_thread->control.step_over_calls == STEP_OVER_ALL |
8119 | || inline_frame_is_marked_for_skip (false, ecs->event_thread)) | |
edb3359d DJ |
8120 | keep_going (ecs); |
8121 | else | |
bdc36728 | 8122 | end_stepping_range (ecs); |
edb3359d DJ |
8123 | return; |
8124 | } | |
8125 | ||
8c95582d | 8126 | bool refresh_step_info = true; |
1edb66d8 | 8127 | if ((ecs->event_thread->stop_pc () == stop_pc_sal.pc) |
4e1c45ea | 8128 | && (ecs->event_thread->current_line != stop_pc_sal.line |
24b21115 | 8129 | || ecs->event_thread->current_symtab != stop_pc_sal.symtab)) |
488f131b | 8130 | { |
ebde6f2d TV |
8131 | /* We are at a different line. */ |
8132 | ||
8c95582d AB |
8133 | if (stop_pc_sal.is_stmt) |
8134 | { | |
fe6356de CL |
8135 | if (execution_direction == EXEC_REVERSE) |
8136 | { | |
8137 | /* We are stepping backwards make sure we have reached the | |
8138 | beginning of the line. */ | |
8139 | CORE_ADDR stop_pc = ecs->event_thread->stop_pc (); | |
8140 | CORE_ADDR start_line_pc | |
8141 | = update_line_range_start (stop_pc, ecs); | |
8142 | ||
8143 | if (stop_pc != start_line_pc) | |
8144 | { | |
8145 | /* Have not reached the beginning of the source code line. | |
8146 | Set a step range. Execution should stop in any function | |
8147 | calls we execute back into before reaching the beginning | |
8148 | of the line. */ | |
8149 | ecs->event_thread->control.step_range_start | |
8150 | = start_line_pc; | |
8151 | ecs->event_thread->control.step_range_end = stop_pc; | |
8152 | set_step_info (ecs->event_thread, frame, stop_pc_sal); | |
8153 | keep_going (ecs); | |
8154 | return; | |
8155 | } | |
8156 | } | |
8157 | ||
ebde6f2d TV |
8158 | /* We are at the start of a statement. |
8159 | ||
8160 | So stop. Note that we don't stop if we step into the middle of a | |
8161 | statement. That is said to make things like for (;;) statements | |
8162 | work better. */ | |
1eb8556f | 8163 | infrun_debug_printf ("stepped to a different line"); |
8c95582d AB |
8164 | end_stepping_range (ecs); |
8165 | return; | |
8166 | } | |
fb84fbf8 | 8167 | else if (curr_frame_id == original_frame_id) |
8c95582d | 8168 | { |
ebde6f2d TV |
8169 | /* We are not at the start of a statement, and we have not changed |
8170 | frame. | |
8171 | ||
8172 | We ignore this line table entry, and continue stepping forward, | |
8c95582d AB |
8173 | looking for a better place to stop. */ |
8174 | refresh_step_info = false; | |
1eb8556f SM |
8175 | infrun_debug_printf ("stepped to a different line, but " |
8176 | "it's not the start of a statement"); | |
8c95582d | 8177 | } |
ebde6f2d TV |
8178 | else |
8179 | { | |
8180 | /* We are not the start of a statement, and we have changed frame. | |
8181 | ||
8182 | We ignore this line table entry, and continue stepping forward, | |
8183 | looking for a better place to stop. Keep refresh_step_info at | |
8184 | true to note that the frame has changed, but ignore the line | |
8185 | number to make sure we don't ignore a subsequent entry with the | |
8186 | same line number. */ | |
8187 | stop_pc_sal.line = 0; | |
8188 | infrun_debug_printf ("stepped to a different frame, but " | |
8189 | "it's not the start of a statement"); | |
8190 | } | |
488f131b | 8191 | } |
bf2813af GL |
8192 | else if (execution_direction == EXEC_REVERSE |
8193 | && curr_frame_id != original_frame_id | |
8194 | && original_frame_id.code_addr_p && curr_frame_id.code_addr_p | |
8195 | && original_frame_id.code_addr == curr_frame_id.code_addr) | |
8196 | { | |
8197 | /* If we enter here, we're leaving a recursive function call. In this | |
8198 | situation, we shouldn't refresh the step information, because if we | |
8199 | do, we'll lose the frame_id of when we started stepping, and this | |
8200 | will make GDB not know we need to print frame information. */ | |
8201 | refresh_step_info = false; | |
8202 | infrun_debug_printf ("reverse stepping, left a recursive call, don't " | |
8203 | "update step info so we remember we left a frame"); | |
8204 | } | |
c906108c | 8205 | |
488f131b | 8206 | /* We aren't done stepping. |
c906108c | 8207 | |
488f131b JB |
8208 | Optimize by setting the stepping range to the line. |
8209 | (We might not be in the original line, but if we entered a | |
8210 | new line in mid-statement, we continue stepping. This makes | |
8c95582d AB |
8211 | things like for(;;) statements work better.) |
8212 | ||
8213 | If we entered a SAL that indicates a non-statement line table entry, | |
8214 | then we update the stepping range, but we don't update the step info, | |
8215 | which includes things like the line number we are stepping away from. | |
8216 | This means we will stop when we find a line table entry that is marked | |
8217 | as is-statement, even if it matches the non-statement one we just | |
8218 | stepped into. */ | |
c906108c | 8219 | |
16c381f0 JK |
8220 | ecs->event_thread->control.step_range_start = stop_pc_sal.pc; |
8221 | ecs->event_thread->control.step_range_end = stop_pc_sal.end; | |
c1e36e3e | 8222 | ecs->event_thread->control.may_range_step = 1; |
c8353d68 AB |
8223 | infrun_debug_printf |
8224 | ("updated step range, start = %s, end = %s, may_range_step = %d", | |
8225 | paddress (gdbarch, ecs->event_thread->control.step_range_start), | |
8226 | paddress (gdbarch, ecs->event_thread->control.step_range_end), | |
8227 | ecs->event_thread->control.may_range_step); | |
8c95582d AB |
8228 | if (refresh_step_info) |
8229 | set_step_info (ecs->event_thread, frame, stop_pc_sal); | |
488f131b | 8230 | |
1eb8556f | 8231 | infrun_debug_printf ("keep going"); |
fe6356de CL |
8232 | |
8233 | if (execution_direction == EXEC_REVERSE) | |
8234 | { | |
8235 | CORE_ADDR stop_pc = ecs->event_thread->stop_pc (); | |
8236 | ||
8237 | /* Make sure the stop_pc is set to the beginning of the line. */ | |
8238 | if (stop_pc != ecs->event_thread->control.step_range_start) | |
8239 | ecs->event_thread->control.step_range_start | |
8240 | = update_line_range_start (stop_pc, ecs); | |
8241 | } | |
8242 | ||
488f131b | 8243 | keep_going (ecs); |
104c1213 JM |
8244 | } |
8245 | ||
408f6686 PA |
8246 | static bool restart_stepped_thread (process_stratum_target *resume_target, |
8247 | ptid_t resume_ptid); | |
8248 | ||
c447ac0b PA |
8249 | /* In all-stop mode, if we're currently stepping but have stopped in |
8250 | some other thread, we may need to switch back to the stepped | |
8251 | thread. Returns true we set the inferior running, false if we left | |
8252 | it stopped (and the event needs further processing). */ | |
8253 | ||
c4464ade | 8254 | static bool |
c447ac0b PA |
8255 | switch_back_to_stepped_thread (struct execution_control_state *ecs) |
8256 | { | |
fbea99ea | 8257 | if (!target_is_non_stop_p ()) |
c447ac0b | 8258 | { |
99619bea PA |
8259 | /* If any thread is blocked on some internal breakpoint, and we |
8260 | simply need to step over that breakpoint to get it going | |
8261 | again, do that first. */ | |
8262 | ||
8263 | /* However, if we see an event for the stepping thread, then we | |
8264 | know all other threads have been moved past their breakpoints | |
8265 | already. Let the caller check whether the step is finished, | |
8266 | etc., before deciding to move it past a breakpoint. */ | |
8267 | if (ecs->event_thread->control.step_range_end != 0) | |
c4464ade | 8268 | return false; |
99619bea PA |
8269 | |
8270 | /* Check if the current thread is blocked on an incomplete | |
8271 | step-over, interrupted by a random signal. */ | |
8272 | if (ecs->event_thread->control.trap_expected | |
1edb66d8 | 8273 | && ecs->event_thread->stop_signal () != GDB_SIGNAL_TRAP) |
c447ac0b | 8274 | { |
1eb8556f SM |
8275 | infrun_debug_printf |
8276 | ("need to finish step-over of [%s]", | |
0fab7955 | 8277 | ecs->event_thread->ptid.to_string ().c_str ()); |
99619bea | 8278 | keep_going (ecs); |
c4464ade | 8279 | return true; |
99619bea | 8280 | } |
2adfaa28 | 8281 | |
99619bea PA |
8282 | /* Check if the current thread is blocked by a single-step |
8283 | breakpoint of another thread. */ | |
8284 | if (ecs->hit_singlestep_breakpoint) | |
8285 | { | |
1eb8556f | 8286 | infrun_debug_printf ("need to step [%s] over single-step breakpoint", |
0fab7955 | 8287 | ecs->ptid.to_string ().c_str ()); |
99619bea | 8288 | keep_going (ecs); |
c4464ade | 8289 | return true; |
99619bea PA |
8290 | } |
8291 | ||
4d9d9d04 PA |
8292 | /* If this thread needs yet another step-over (e.g., stepping |
8293 | through a delay slot), do it first before moving on to | |
8294 | another thread. */ | |
8295 | if (thread_still_needs_step_over (ecs->event_thread)) | |
8296 | { | |
1eb8556f SM |
8297 | infrun_debug_printf |
8298 | ("thread [%s] still needs step-over", | |
0fab7955 | 8299 | ecs->event_thread->ptid.to_string ().c_str ()); |
4d9d9d04 | 8300 | keep_going (ecs); |
c4464ade | 8301 | return true; |
4d9d9d04 | 8302 | } |
70509625 | 8303 | |
483805cf PA |
8304 | /* If scheduler locking applies even if not stepping, there's no |
8305 | need to walk over threads. Above we've checked whether the | |
8306 | current thread is stepping. If some other thread not the | |
8307 | event thread is stepping, then it must be that scheduler | |
8308 | locking is not in effect. */ | |
856e7dd6 | 8309 | if (schedlock_applies (ecs->event_thread)) |
c4464ade | 8310 | return false; |
483805cf | 8311 | |
4d9d9d04 PA |
8312 | /* Otherwise, we no longer expect a trap in the current thread. |
8313 | Clear the trap_expected flag before switching back -- this is | |
8314 | what keep_going does as well, if we call it. */ | |
8315 | ecs->event_thread->control.trap_expected = 0; | |
8316 | ||
8317 | /* Likewise, clear the signal if it should not be passed. */ | |
1edb66d8 SM |
8318 | if (!signal_program[ecs->event_thread->stop_signal ()]) |
8319 | ecs->event_thread->set_stop_signal (GDB_SIGNAL_0); | |
4d9d9d04 | 8320 | |
408f6686 | 8321 | if (restart_stepped_thread (ecs->target, ecs->ptid)) |
4d9d9d04 PA |
8322 | { |
8323 | prepare_to_wait (ecs); | |
c4464ade | 8324 | return true; |
4d9d9d04 PA |
8325 | } |
8326 | ||
408f6686 PA |
8327 | switch_to_thread (ecs->event_thread); |
8328 | } | |
4d9d9d04 | 8329 | |
408f6686 PA |
8330 | return false; |
8331 | } | |
f3f8ece4 | 8332 | |
408f6686 PA |
8333 | /* Look for the thread that was stepping, and resume it. |
8334 | RESUME_TARGET / RESUME_PTID indicate the set of threads the caller | |
8335 | is resuming. Return true if a thread was started, false | |
8336 | otherwise. */ | |
483805cf | 8337 | |
408f6686 PA |
8338 | static bool |
8339 | restart_stepped_thread (process_stratum_target *resume_target, | |
8340 | ptid_t resume_ptid) | |
8341 | { | |
8342 | /* Do all pending step-overs before actually proceeding with | |
8343 | step/next/etc. */ | |
8344 | if (start_step_over ()) | |
8345 | return true; | |
483805cf | 8346 | |
408f6686 PA |
8347 | for (thread_info *tp : all_threads_safe ()) |
8348 | { | |
8349 | if (tp->state == THREAD_EXITED) | |
8350 | continue; | |
8351 | ||
1edb66d8 | 8352 | if (tp->has_pending_waitstatus ()) |
408f6686 | 8353 | continue; |
483805cf | 8354 | |
408f6686 PA |
8355 | /* Ignore threads of processes the caller is not |
8356 | resuming. */ | |
8357 | if (!sched_multi | |
8358 | && (tp->inf->process_target () != resume_target | |
8359 | || tp->inf->pid != resume_ptid.pid ())) | |
8360 | continue; | |
483805cf | 8361 | |
408f6686 PA |
8362 | if (tp->control.trap_expected) |
8363 | { | |
8364 | infrun_debug_printf ("switching back to stepped thread (step-over)"); | |
483805cf | 8365 | |
408f6686 PA |
8366 | if (keep_going_stepped_thread (tp)) |
8367 | return true; | |
99619bea | 8368 | } |
408f6686 PA |
8369 | } |
8370 | ||
8371 | for (thread_info *tp : all_threads_safe ()) | |
8372 | { | |
8373 | if (tp->state == THREAD_EXITED) | |
8374 | continue; | |
8375 | ||
1edb66d8 | 8376 | if (tp->has_pending_waitstatus ()) |
408f6686 | 8377 | continue; |
99619bea | 8378 | |
408f6686 PA |
8379 | /* Ignore threads of processes the caller is not |
8380 | resuming. */ | |
8381 | if (!sched_multi | |
8382 | && (tp->inf->process_target () != resume_target | |
8383 | || tp->inf->pid != resume_ptid.pid ())) | |
8384 | continue; | |
8385 | ||
8386 | /* Did we find the stepping thread? */ | |
8387 | if (tp->control.step_range_end) | |
99619bea | 8388 | { |
408f6686 | 8389 | infrun_debug_printf ("switching back to stepped thread (stepping)"); |
c447ac0b | 8390 | |
408f6686 PA |
8391 | if (keep_going_stepped_thread (tp)) |
8392 | return true; | |
2ac7589c PA |
8393 | } |
8394 | } | |
2adfaa28 | 8395 | |
c4464ade | 8396 | return false; |
2ac7589c | 8397 | } |
2adfaa28 | 8398 | |
408f6686 PA |
8399 | /* See infrun.h. */ |
8400 | ||
8401 | void | |
8402 | restart_after_all_stop_detach (process_stratum_target *proc_target) | |
8403 | { | |
8404 | /* Note we don't check target_is_non_stop_p() here, because the | |
8405 | current inferior may no longer have a process_stratum target | |
8406 | pushed, as we just detached. */ | |
8407 | ||
8408 | /* See if we have a THREAD_RUNNING thread that need to be | |
8409 | re-resumed. If we have any thread that is already executing, | |
8410 | then we don't need to resume the target -- it is already been | |
8411 | resumed. With the remote target (in all-stop), it's even | |
8412 | impossible to issue another resumption if the target is already | |
8413 | resumed, until the target reports a stop. */ | |
8414 | for (thread_info *thr : all_threads (proc_target)) | |
8415 | { | |
8416 | if (thr->state != THREAD_RUNNING) | |
8417 | continue; | |
8418 | ||
8419 | /* If we have any thread that is already executing, then we | |
8420 | don't need to resume the target -- it is already been | |
8421 | resumed. */ | |
611841bb | 8422 | if (thr->executing ()) |
408f6686 PA |
8423 | return; |
8424 | ||
8425 | /* If we have a pending event to process, skip resuming the | |
8426 | target and go straight to processing it. */ | |
1edb66d8 | 8427 | if (thr->resumed () && thr->has_pending_waitstatus ()) |
408f6686 PA |
8428 | return; |
8429 | } | |
8430 | ||
8431 | /* Alright, we need to re-resume the target. If a thread was | |
8432 | stepping, we need to restart it stepping. */ | |
8433 | if (restart_stepped_thread (proc_target, minus_one_ptid)) | |
8434 | return; | |
8435 | ||
8436 | /* Otherwise, find the first THREAD_RUNNING thread and resume | |
8437 | it. */ | |
8438 | for (thread_info *thr : all_threads (proc_target)) | |
8439 | { | |
8440 | if (thr->state != THREAD_RUNNING) | |
8441 | continue; | |
8442 | ||
aa563d16 | 8443 | execution_control_state ecs (thr); |
408f6686 PA |
8444 | switch_to_thread (thr); |
8445 | keep_going (&ecs); | |
8446 | return; | |
8447 | } | |
8448 | } | |
8449 | ||
2ac7589c PA |
8450 | /* Set a previously stepped thread back to stepping. Returns true on |
8451 | success, false if the resume is not possible (e.g., the thread | |
8452 | vanished). */ | |
8453 | ||
c4464ade | 8454 | static bool |
2ac7589c PA |
8455 | keep_going_stepped_thread (struct thread_info *tp) |
8456 | { | |
bd2b40ac | 8457 | frame_info_ptr frame; |
2adfaa28 | 8458 | |
2ac7589c PA |
8459 | /* If the stepping thread exited, then don't try to switch back and |
8460 | resume it, which could fail in several different ways depending | |
8461 | on the target. Instead, just keep going. | |
2adfaa28 | 8462 | |
2ac7589c PA |
8463 | We can find a stepping dead thread in the thread list in two |
8464 | cases: | |
2adfaa28 | 8465 | |
2ac7589c PA |
8466 | - The target supports thread exit events, and when the target |
8467 | tries to delete the thread from the thread list, inferior_ptid | |
8468 | pointed at the exiting thread. In such case, calling | |
8469 | delete_thread does not really remove the thread from the list; | |
8470 | instead, the thread is left listed, with 'exited' state. | |
64ce06e4 | 8471 | |
2ac7589c PA |
8472 | - The target's debug interface does not support thread exit |
8473 | events, and so we have no idea whatsoever if the previously | |
8474 | stepping thread is still alive. For that reason, we need to | |
8475 | synchronously query the target now. */ | |
2adfaa28 | 8476 | |
00431a78 | 8477 | if (tp->state == THREAD_EXITED || !target_thread_alive (tp->ptid)) |
2ac7589c | 8478 | { |
1eb8556f SM |
8479 | infrun_debug_printf ("not resuming previously stepped thread, it has " |
8480 | "vanished"); | |
2ac7589c | 8481 | |
00431a78 | 8482 | delete_thread (tp); |
c4464ade | 8483 | return false; |
c447ac0b | 8484 | } |
2ac7589c | 8485 | |
1eb8556f | 8486 | infrun_debug_printf ("resuming previously stepped thread"); |
2ac7589c | 8487 | |
aa563d16 | 8488 | execution_control_state ecs (tp); |
00431a78 | 8489 | switch_to_thread (tp); |
2ac7589c | 8490 | |
1edb66d8 | 8491 | tp->set_stop_pc (regcache_read_pc (get_thread_regcache (tp))); |
2ac7589c | 8492 | frame = get_current_frame (); |
2ac7589c PA |
8493 | |
8494 | /* If the PC of the thread we were trying to single-step has | |
8495 | changed, then that thread has trapped or been signaled, but the | |
8496 | event has not been reported to GDB yet. Re-poll the target | |
8497 | looking for this particular thread's event (i.e. temporarily | |
8498 | enable schedlock) by: | |
8499 | ||
8500 | - setting a break at the current PC | |
8501 | - resuming that particular thread, only (by setting trap | |
8502 | expected) | |
8503 | ||
8504 | This prevents us continuously moving the single-step breakpoint | |
8505 | forward, one instruction at a time, overstepping. */ | |
8506 | ||
1edb66d8 | 8507 | if (tp->stop_pc () != tp->prev_pc) |
2ac7589c PA |
8508 | { |
8509 | ptid_t resume_ptid; | |
8510 | ||
1eb8556f | 8511 | infrun_debug_printf ("expected thread advanced also (%s -> %s)", |
99d9c3b9 SM |
8512 | paddress (current_inferior ()->arch (), tp->prev_pc), |
8513 | paddress (current_inferior ()->arch (), | |
8514 | tp->stop_pc ())); | |
2ac7589c PA |
8515 | |
8516 | /* Clear the info of the previous step-over, as it's no longer | |
8517 | valid (if the thread was trying to step over a breakpoint, it | |
8518 | has already succeeded). It's what keep_going would do too, | |
8519 | if we called it. Do this before trying to insert the sss | |
8520 | breakpoint, otherwise if we were previously trying to step | |
8521 | over this exact address in another thread, the breakpoint is | |
8522 | skipped. */ | |
8523 | clear_step_over_info (); | |
8524 | tp->control.trap_expected = 0; | |
8525 | ||
8526 | insert_single_step_breakpoint (get_frame_arch (frame), | |
8527 | get_frame_address_space (frame), | |
1edb66d8 | 8528 | tp->stop_pc ()); |
2ac7589c | 8529 | |
7846f3aa | 8530 | tp->set_resumed (true); |
fbea99ea | 8531 | resume_ptid = internal_resume_ptid (tp->control.stepping_command); |
c4464ade | 8532 | do_target_resume (resume_ptid, false, GDB_SIGNAL_0); |
2ac7589c PA |
8533 | } |
8534 | else | |
8535 | { | |
1eb8556f | 8536 | infrun_debug_printf ("expected thread still hasn't advanced"); |
2ac7589c | 8537 | |
aa563d16 | 8538 | keep_going_pass_signal (&ecs); |
2ac7589c | 8539 | } |
c4464ade SM |
8540 | |
8541 | return true; | |
c447ac0b PA |
8542 | } |
8543 | ||
8b061563 PA |
8544 | /* Is thread TP in the middle of (software or hardware) |
8545 | single-stepping? (Note the result of this function must never be | |
8546 | passed directly as target_resume's STEP parameter.) */ | |
104c1213 | 8547 | |
c4464ade | 8548 | static bool |
b3444185 | 8549 | currently_stepping (struct thread_info *tp) |
a7212384 | 8550 | { |
8358c15c | 8551 | return ((tp->control.step_range_end |
03acd4d8 | 8552 | && tp->control.step_resume_breakpoint == nullptr) |
8358c15c | 8553 | || tp->control.trap_expected |
af48d08f | 8554 | || tp->stepped_breakpoint |
8358c15c | 8555 | || bpstat_should_step ()); |
a7212384 UW |
8556 | } |
8557 | ||
b2175913 MS |
8558 | /* Inferior has stepped into a subroutine call with source code that |
8559 | we should not step over. Do step to the first line of code in | |
8560 | it. */ | |
c2c6d25f JM |
8561 | |
8562 | static void | |
568d6575 UW |
8563 | handle_step_into_function (struct gdbarch *gdbarch, |
8564 | struct execution_control_state *ecs) | |
c2c6d25f | 8565 | { |
7e324e48 GB |
8566 | fill_in_stop_func (gdbarch, ecs); |
8567 | ||
f2ffa92b | 8568 | compunit_symtab *cust |
1edb66d8 | 8569 | = find_pc_compunit_symtab (ecs->event_thread->stop_pc ()); |
03acd4d8 | 8570 | if (cust != nullptr && cust->language () != language_asm) |
46a62268 YQ |
8571 | ecs->stop_func_start |
8572 | = gdbarch_skip_prologue_noexcept (gdbarch, ecs->stop_func_start); | |
c2c6d25f | 8573 | |
51abb421 | 8574 | symtab_and_line stop_func_sal = find_pc_line (ecs->stop_func_start, 0); |
c2c6d25f JM |
8575 | /* Use the step_resume_break to step until the end of the prologue, |
8576 | even if that involves jumps (as it seems to on the vax under | |
8577 | 4.2). */ | |
8578 | /* If the prologue ends in the middle of a source line, continue to | |
8579 | the end of that source line (if it is still within the function). | |
8580 | Otherwise, just go to end of prologue. */ | |
2afb61aa PA |
8581 | if (stop_func_sal.end |
8582 | && stop_func_sal.pc != ecs->stop_func_start | |
8583 | && stop_func_sal.end < ecs->stop_func_end) | |
8584 | ecs->stop_func_start = stop_func_sal.end; | |
c2c6d25f | 8585 | |
2dbd5e30 KB |
8586 | /* Architectures which require breakpoint adjustment might not be able |
8587 | to place a breakpoint at the computed address. If so, the test | |
8588 | ``ecs->stop_func_start == stop_pc'' will never succeed. Adjust | |
8589 | ecs->stop_func_start to an address at which a breakpoint may be | |
8590 | legitimately placed. | |
8fb3e588 | 8591 | |
2dbd5e30 KB |
8592 | Note: kevinb/2004-01-19: On FR-V, if this adjustment is not |
8593 | made, GDB will enter an infinite loop when stepping through | |
8594 | optimized code consisting of VLIW instructions which contain | |
8595 | subinstructions corresponding to different source lines. On | |
8596 | FR-V, it's not permitted to place a breakpoint on any but the | |
8597 | first subinstruction of a VLIW instruction. When a breakpoint is | |
8598 | set, GDB will adjust the breakpoint address to the beginning of | |
8599 | the VLIW instruction. Thus, we need to make the corresponding | |
8600 | adjustment here when computing the stop address. */ | |
8fb3e588 | 8601 | |
568d6575 | 8602 | if (gdbarch_adjust_breakpoint_address_p (gdbarch)) |
2dbd5e30 KB |
8603 | { |
8604 | ecs->stop_func_start | |
568d6575 | 8605 | = gdbarch_adjust_breakpoint_address (gdbarch, |
8fb3e588 | 8606 | ecs->stop_func_start); |
2dbd5e30 KB |
8607 | } |
8608 | ||
1edb66d8 | 8609 | if (ecs->stop_func_start == ecs->event_thread->stop_pc ()) |
c2c6d25f JM |
8610 | { |
8611 | /* We are already there: stop now. */ | |
bdc36728 | 8612 | end_stepping_range (ecs); |
c2c6d25f JM |
8613 | return; |
8614 | } | |
8615 | else | |
8616 | { | |
8617 | /* Put the step-breakpoint there and go until there. */ | |
51abb421 | 8618 | symtab_and_line sr_sal; |
c2c6d25f JM |
8619 | sr_sal.pc = ecs->stop_func_start; |
8620 | sr_sal.section = find_pc_overlay (ecs->stop_func_start); | |
6c95b8df | 8621 | sr_sal.pspace = get_frame_program_space (get_current_frame ()); |
44cbf7b5 | 8622 | |
c2c6d25f | 8623 | /* Do not specify what the fp should be when we stop since on |
dda83cd7 SM |
8624 | some machines the prologue is where the new fp value is |
8625 | established. */ | |
a6d9a66e | 8626 | insert_step_resume_breakpoint_at_sal (gdbarch, sr_sal, null_frame_id); |
c2c6d25f JM |
8627 | |
8628 | /* And make sure stepping stops right away then. */ | |
16c381f0 | 8629 | ecs->event_thread->control.step_range_end |
dda83cd7 | 8630 | = ecs->event_thread->control.step_range_start; |
c2c6d25f JM |
8631 | } |
8632 | keep_going (ecs); | |
8633 | } | |
d4f3574e | 8634 | |
b2175913 MS |
8635 | /* Inferior has stepped backward into a subroutine call with source |
8636 | code that we should not step over. Do step to the beginning of the | |
8637 | last line of code in it. */ | |
8638 | ||
8639 | static void | |
568d6575 UW |
8640 | handle_step_into_function_backward (struct gdbarch *gdbarch, |
8641 | struct execution_control_state *ecs) | |
b2175913 | 8642 | { |
43f3e411 | 8643 | struct compunit_symtab *cust; |
167e4384 | 8644 | struct symtab_and_line stop_func_sal; |
b2175913 | 8645 | |
7e324e48 GB |
8646 | fill_in_stop_func (gdbarch, ecs); |
8647 | ||
1edb66d8 | 8648 | cust = find_pc_compunit_symtab (ecs->event_thread->stop_pc ()); |
03acd4d8 | 8649 | if (cust != nullptr && cust->language () != language_asm) |
46a62268 YQ |
8650 | ecs->stop_func_start |
8651 | = gdbarch_skip_prologue_noexcept (gdbarch, ecs->stop_func_start); | |
b2175913 | 8652 | |
1edb66d8 | 8653 | stop_func_sal = find_pc_line (ecs->event_thread->stop_pc (), 0); |
b2175913 MS |
8654 | |
8655 | /* OK, we're just going to keep stepping here. */ | |
1edb66d8 | 8656 | if (stop_func_sal.pc == ecs->event_thread->stop_pc ()) |
b2175913 MS |
8657 | { |
8658 | /* We're there already. Just stop stepping now. */ | |
bdc36728 | 8659 | end_stepping_range (ecs); |
b2175913 MS |
8660 | } |
8661 | else | |
8662 | { | |
8663 | /* Else just reset the step range and keep going. | |
8664 | No step-resume breakpoint, they don't work for | |
8665 | epilogues, which can have multiple entry paths. */ | |
16c381f0 JK |
8666 | ecs->event_thread->control.step_range_start = stop_func_sal.pc; |
8667 | ecs->event_thread->control.step_range_end = stop_func_sal.end; | |
b2175913 MS |
8668 | keep_going (ecs); |
8669 | } | |
8670 | return; | |
8671 | } | |
8672 | ||
d3169d93 | 8673 | /* Insert a "step-resume breakpoint" at SR_SAL with frame ID SR_ID. |
44cbf7b5 AC |
8674 | This is used to both functions and to skip over code. */ |
8675 | ||
8676 | static void | |
2c03e5be PA |
8677 | insert_step_resume_breakpoint_at_sal_1 (struct gdbarch *gdbarch, |
8678 | struct symtab_and_line sr_sal, | |
8679 | struct frame_id sr_id, | |
8680 | enum bptype sr_type) | |
44cbf7b5 | 8681 | { |
611c83ae PA |
8682 | /* There should never be more than one step-resume or longjmp-resume |
8683 | breakpoint per thread, so we should never be setting a new | |
44cbf7b5 | 8684 | step_resume_breakpoint when one is already active. */ |
03acd4d8 | 8685 | gdb_assert (inferior_thread ()->control.step_resume_breakpoint == nullptr); |
2c03e5be | 8686 | gdb_assert (sr_type == bp_step_resume || sr_type == bp_hp_step_resume); |
d3169d93 | 8687 | |
1eb8556f SM |
8688 | infrun_debug_printf ("inserting step-resume breakpoint at %s", |
8689 | paddress (gdbarch, sr_sal.pc)); | |
d3169d93 | 8690 | |
8358c15c | 8691 | inferior_thread ()->control.step_resume_breakpoint |
454dafbd | 8692 | = set_momentary_breakpoint (gdbarch, sr_sal, sr_id, sr_type).release (); |
2c03e5be PA |
8693 | } |
8694 | ||
9da8c2a0 | 8695 | void |
2c03e5be PA |
8696 | insert_step_resume_breakpoint_at_sal (struct gdbarch *gdbarch, |
8697 | struct symtab_and_line sr_sal, | |
8698 | struct frame_id sr_id) | |
8699 | { | |
8700 | insert_step_resume_breakpoint_at_sal_1 (gdbarch, | |
8701 | sr_sal, sr_id, | |
8702 | bp_step_resume); | |
44cbf7b5 | 8703 | } |
7ce450bd | 8704 | |
2c03e5be PA |
8705 | /* Insert a "high-priority step-resume breakpoint" at RETURN_FRAME.pc. |
8706 | This is used to skip a potential signal handler. | |
7ce450bd | 8707 | |
14e60db5 DJ |
8708 | This is called with the interrupted function's frame. The signal |
8709 | handler, when it returns, will resume the interrupted function at | |
8710 | RETURN_FRAME.pc. */ | |
d303a6c7 AC |
8711 | |
8712 | static void | |
bd2b40ac | 8713 | insert_hp_step_resume_breakpoint_at_frame (frame_info_ptr return_frame) |
d303a6c7 | 8714 | { |
03acd4d8 | 8715 | gdb_assert (return_frame != nullptr); |
d303a6c7 | 8716 | |
51abb421 PA |
8717 | struct gdbarch *gdbarch = get_frame_arch (return_frame); |
8718 | ||
8719 | symtab_and_line sr_sal; | |
568d6575 | 8720 | sr_sal.pc = gdbarch_addr_bits_remove (gdbarch, get_frame_pc (return_frame)); |
d303a6c7 | 8721 | sr_sal.section = find_pc_overlay (sr_sal.pc); |
6c95b8df | 8722 | sr_sal.pspace = get_frame_program_space (return_frame); |
d303a6c7 | 8723 | |
2c03e5be PA |
8724 | insert_step_resume_breakpoint_at_sal_1 (gdbarch, sr_sal, |
8725 | get_stack_frame_id (return_frame), | |
8726 | bp_hp_step_resume); | |
d303a6c7 AC |
8727 | } |
8728 | ||
2c03e5be PA |
8729 | /* Insert a "step-resume breakpoint" at the previous frame's PC. This |
8730 | is used to skip a function after stepping into it (for "next" or if | |
8731 | the called function has no debugging information). | |
14e60db5 DJ |
8732 | |
8733 | The current function has almost always been reached by single | |
8734 | stepping a call or return instruction. NEXT_FRAME belongs to the | |
8735 | current function, and the breakpoint will be set at the caller's | |
8736 | resume address. | |
8737 | ||
8738 | This is a separate function rather than reusing | |
2c03e5be | 8739 | insert_hp_step_resume_breakpoint_at_frame in order to avoid |
14e60db5 | 8740 | get_prev_frame, which may stop prematurely (see the implementation |
c7ce8faa | 8741 | of frame_unwind_caller_id for an example). */ |
14e60db5 DJ |
8742 | |
8743 | static void | |
bd2b40ac | 8744 | insert_step_resume_breakpoint_at_caller (frame_info_ptr next_frame) |
14e60db5 | 8745 | { |
14e60db5 DJ |
8746 | /* We shouldn't have gotten here if we don't know where the call site |
8747 | is. */ | |
c7ce8faa | 8748 | gdb_assert (frame_id_p (frame_unwind_caller_id (next_frame))); |
14e60db5 | 8749 | |
51abb421 | 8750 | struct gdbarch *gdbarch = frame_unwind_caller_arch (next_frame); |
14e60db5 | 8751 | |
51abb421 | 8752 | symtab_and_line sr_sal; |
c7ce8faa DJ |
8753 | sr_sal.pc = gdbarch_addr_bits_remove (gdbarch, |
8754 | frame_unwind_caller_pc (next_frame)); | |
14e60db5 | 8755 | sr_sal.section = find_pc_overlay (sr_sal.pc); |
6c95b8df | 8756 | sr_sal.pspace = frame_unwind_program_space (next_frame); |
14e60db5 | 8757 | |
a6d9a66e | 8758 | insert_step_resume_breakpoint_at_sal (gdbarch, sr_sal, |
c7ce8faa | 8759 | frame_unwind_caller_id (next_frame)); |
14e60db5 DJ |
8760 | } |
8761 | ||
611c83ae PA |
8762 | /* Insert a "longjmp-resume" breakpoint at PC. This is used to set a |
8763 | new breakpoint at the target of a jmp_buf. The handling of | |
8764 | longjmp-resume uses the same mechanisms used for handling | |
8765 | "step-resume" breakpoints. */ | |
8766 | ||
8767 | static void | |
a6d9a66e | 8768 | insert_longjmp_resume_breakpoint (struct gdbarch *gdbarch, CORE_ADDR pc) |
611c83ae | 8769 | { |
e81a37f7 TT |
8770 | /* There should never be more than one longjmp-resume breakpoint per |
8771 | thread, so we should never be setting a new | |
611c83ae | 8772 | longjmp_resume_breakpoint when one is already active. */ |
03acd4d8 | 8773 | gdb_assert (inferior_thread ()->control.exception_resume_breakpoint == nullptr); |
611c83ae | 8774 | |
1eb8556f SM |
8775 | infrun_debug_printf ("inserting longjmp-resume breakpoint at %s", |
8776 | paddress (gdbarch, pc)); | |
611c83ae | 8777 | |
e81a37f7 | 8778 | inferior_thread ()->control.exception_resume_breakpoint = |
454dafbd | 8779 | set_momentary_breakpoint_at_pc (gdbarch, pc, bp_longjmp_resume).release (); |
611c83ae PA |
8780 | } |
8781 | ||
186c406b TT |
8782 | /* Insert an exception resume breakpoint. TP is the thread throwing |
8783 | the exception. The block B is the block of the unwinder debug hook | |
8784 | function. FRAME is the frame corresponding to the call to this | |
8785 | function. SYM is the symbol of the function argument holding the | |
8786 | target PC of the exception. */ | |
8787 | ||
8788 | static void | |
8789 | insert_exception_resume_breakpoint (struct thread_info *tp, | |
3977b71f | 8790 | const struct block *b, |
bd2b40ac | 8791 | frame_info_ptr frame, |
186c406b TT |
8792 | struct symbol *sym) |
8793 | { | |
a70b8144 | 8794 | try |
186c406b | 8795 | { |
63e43d3a | 8796 | struct block_symbol vsym; |
186c406b TT |
8797 | struct value *value; |
8798 | CORE_ADDR handler; | |
8799 | struct breakpoint *bp; | |
8800 | ||
987012b8 | 8801 | vsym = lookup_symbol_search_name (sym->search_name (), |
de63c46b | 8802 | b, VAR_DOMAIN); |
63e43d3a | 8803 | value = read_var_value (vsym.symbol, vsym.block, frame); |
186c406b | 8804 | /* If the value was optimized out, revert to the old behavior. */ |
d00664db | 8805 | if (! value->optimized_out ()) |
186c406b TT |
8806 | { |
8807 | handler = value_as_address (value); | |
8808 | ||
1eb8556f SM |
8809 | infrun_debug_printf ("exception resume at %lx", |
8810 | (unsigned long) handler); | |
186c406b | 8811 | |
60a13bbc AB |
8812 | /* set_momentary_breakpoint_at_pc creates a thread-specific |
8813 | breakpoint for the current inferior thread. */ | |
8814 | gdb_assert (tp == inferior_thread ()); | |
186c406b | 8815 | bp = set_momentary_breakpoint_at_pc (get_frame_arch (frame), |
454dafbd TT |
8816 | handler, |
8817 | bp_exception_resume).release (); | |
c70a6932 JK |
8818 | |
8819 | /* set_momentary_breakpoint_at_pc invalidates FRAME. */ | |
03acd4d8 | 8820 | frame = nullptr; |
c70a6932 | 8821 | |
60a13bbc | 8822 | tp->control.exception_resume_breakpoint = bp; |
186c406b TT |
8823 | } |
8824 | } | |
230d2906 | 8825 | catch (const gdb_exception_error &e) |
492d29ea PA |
8826 | { |
8827 | /* We want to ignore errors here. */ | |
8828 | } | |
186c406b TT |
8829 | } |
8830 | ||
28106bc2 SDJ |
8831 | /* A helper for check_exception_resume that sets an |
8832 | exception-breakpoint based on a SystemTap probe. */ | |
8833 | ||
8834 | static void | |
8835 | insert_exception_resume_from_probe (struct thread_info *tp, | |
729662a5 | 8836 | const struct bound_probe *probe, |
bd2b40ac | 8837 | frame_info_ptr frame) |
28106bc2 SDJ |
8838 | { |
8839 | struct value *arg_value; | |
8840 | CORE_ADDR handler; | |
8841 | struct breakpoint *bp; | |
8842 | ||
8843 | arg_value = probe_safe_evaluate_at_pc (frame, 1); | |
8844 | if (!arg_value) | |
8845 | return; | |
8846 | ||
8847 | handler = value_as_address (arg_value); | |
8848 | ||
1eb8556f SM |
8849 | infrun_debug_printf ("exception resume at %s", |
8850 | paddress (probe->objfile->arch (), handler)); | |
28106bc2 | 8851 | |
60a13bbc AB |
8852 | /* set_momentary_breakpoint_at_pc creates a thread-specific breakpoint |
8853 | for the current inferior thread. */ | |
8854 | gdb_assert (tp == inferior_thread ()); | |
28106bc2 | 8855 | bp = set_momentary_breakpoint_at_pc (get_frame_arch (frame), |
454dafbd | 8856 | handler, bp_exception_resume).release (); |
60a13bbc | 8857 | tp->control.exception_resume_breakpoint = bp; |
28106bc2 SDJ |
8858 | } |
8859 | ||
186c406b TT |
8860 | /* This is called when an exception has been intercepted. Check to |
8861 | see whether the exception's destination is of interest, and if so, | |
8862 | set an exception resume breakpoint there. */ | |
8863 | ||
8864 | static void | |
8865 | check_exception_resume (struct execution_control_state *ecs, | |
bd2b40ac | 8866 | frame_info_ptr frame) |
186c406b | 8867 | { |
729662a5 | 8868 | struct bound_probe probe; |
28106bc2 SDJ |
8869 | struct symbol *func; |
8870 | ||
8871 | /* First see if this exception unwinding breakpoint was set via a | |
8872 | SystemTap probe point. If so, the probe has two arguments: the | |
8873 | CFA and the HANDLER. We ignore the CFA, extract the handler, and | |
8874 | set a breakpoint there. */ | |
6bac7473 | 8875 | probe = find_probe_by_pc (get_frame_pc (frame)); |
935676c9 | 8876 | if (probe.prob) |
28106bc2 | 8877 | { |
729662a5 | 8878 | insert_exception_resume_from_probe (ecs->event_thread, &probe, frame); |
28106bc2 SDJ |
8879 | return; |
8880 | } | |
8881 | ||
8882 | func = get_frame_function (frame); | |
8883 | if (!func) | |
8884 | return; | |
186c406b | 8885 | |
a70b8144 | 8886 | try |
186c406b | 8887 | { |
3977b71f | 8888 | const struct block *b; |
186c406b TT |
8889 | int argno = 0; |
8890 | ||
8891 | /* The exception breakpoint is a thread-specific breakpoint on | |
8892 | the unwinder's debug hook, declared as: | |
8893 | ||
8894 | void _Unwind_DebugHook (void *cfa, void *handler); | |
8895 | ||
8896 | The CFA argument indicates the frame to which control is | |
8897 | about to be transferred. HANDLER is the destination PC. | |
8898 | ||
8899 | We ignore the CFA and set a temporary breakpoint at HANDLER. | |
8900 | This is not extremely efficient but it avoids issues in gdb | |
8901 | with computing the DWARF CFA, and it also works even in weird | |
8902 | cases such as throwing an exception from inside a signal | |
8903 | handler. */ | |
8904 | ||
4aeddc50 | 8905 | b = func->value_block (); |
548a89df | 8906 | for (struct symbol *sym : block_iterator_range (b)) |
186c406b | 8907 | { |
d9743061 | 8908 | if (!sym->is_argument ()) |
186c406b TT |
8909 | continue; |
8910 | ||
8911 | if (argno == 0) | |
8912 | ++argno; | |
8913 | else | |
8914 | { | |
8915 | insert_exception_resume_breakpoint (ecs->event_thread, | |
8916 | b, frame, sym); | |
8917 | break; | |
8918 | } | |
8919 | } | |
8920 | } | |
230d2906 | 8921 | catch (const gdb_exception_error &e) |
492d29ea PA |
8922 | { |
8923 | } | |
186c406b TT |
8924 | } |
8925 | ||
104c1213 | 8926 | static void |
22bcd14b | 8927 | stop_waiting (struct execution_control_state *ecs) |
104c1213 | 8928 | { |
1eb8556f | 8929 | infrun_debug_printf ("stop_waiting"); |
527159b7 | 8930 | |
cd0fc7c3 SS |
8931 | /* Let callers know we don't want to wait for the inferior anymore. */ |
8932 | ecs->wait_some_more = 0; | |
8933 | } | |
8934 | ||
4d9d9d04 PA |
8935 | /* Like keep_going, but passes the signal to the inferior, even if the |
8936 | signal is set to nopass. */ | |
d4f3574e SS |
8937 | |
8938 | static void | |
4d9d9d04 | 8939 | keep_going_pass_signal (struct execution_control_state *ecs) |
d4f3574e | 8940 | { |
d7e15655 | 8941 | gdb_assert (ecs->event_thread->ptid == inferior_ptid); |
7846f3aa | 8942 | gdb_assert (!ecs->event_thread->resumed ()); |
4d9d9d04 | 8943 | |
d4f3574e | 8944 | /* Save the pc before execution, to compare with pc after stop. */ |
fb14de7b | 8945 | ecs->event_thread->prev_pc |
fc75c28b | 8946 | = regcache_read_pc_protected (get_thread_regcache (ecs->event_thread)); |
d4f3574e | 8947 | |
4d9d9d04 | 8948 | if (ecs->event_thread->control.trap_expected) |
d4f3574e | 8949 | { |
4d9d9d04 PA |
8950 | struct thread_info *tp = ecs->event_thread; |
8951 | ||
1eb8556f SM |
8952 | infrun_debug_printf ("%s has trap_expected set, " |
8953 | "resuming to collect trap", | |
0fab7955 | 8954 | tp->ptid.to_string ().c_str ()); |
4d9d9d04 | 8955 | |
a9ba6bae PA |
8956 | /* We haven't yet gotten our trap, and either: intercepted a |
8957 | non-signal event (e.g., a fork); or took a signal which we | |
8958 | are supposed to pass through to the inferior. Simply | |
8959 | continue. */ | |
1edb66d8 | 8960 | resume (ecs->event_thread->stop_signal ()); |
d4f3574e | 8961 | } |
372316f1 PA |
8962 | else if (step_over_info_valid_p ()) |
8963 | { | |
8964 | /* Another thread is stepping over a breakpoint in-line. If | |
8965 | this thread needs a step-over too, queue the request. In | |
8966 | either case, this resume must be deferred for later. */ | |
8967 | struct thread_info *tp = ecs->event_thread; | |
8968 | ||
8969 | if (ecs->hit_singlestep_breakpoint | |
8970 | || thread_still_needs_step_over (tp)) | |
8971 | { | |
1eb8556f SM |
8972 | infrun_debug_printf ("step-over already in progress: " |
8973 | "step-over for %s deferred", | |
0fab7955 | 8974 | tp->ptid.to_string ().c_str ()); |
28d5518b | 8975 | global_thread_step_over_chain_enqueue (tp); |
372316f1 PA |
8976 | } |
8977 | else | |
0fab7955 SM |
8978 | infrun_debug_printf ("step-over in progress: resume of %s deferred", |
8979 | tp->ptid.to_string ().c_str ()); | |
372316f1 | 8980 | } |
d4f3574e SS |
8981 | else |
8982 | { | |
9c742269 | 8983 | regcache *regcache = get_thread_regcache (ecs->event_thread); |
963f9c80 PA |
8984 | int remove_bp; |
8985 | int remove_wps; | |
8d297bbf | 8986 | step_over_what step_what; |
31e77af2 | 8987 | |
d4f3574e | 8988 | /* Either the trap was not expected, but we are continuing |
a9ba6bae PA |
8989 | anyway (if we got a signal, the user asked it be passed to |
8990 | the child) | |
8991 | -- or -- | |
8992 | We got our expected trap, but decided we should resume from | |
8993 | it. | |
d4f3574e | 8994 | |
a9ba6bae | 8995 | We're going to run this baby now! |
d4f3574e | 8996 | |
c36b740a VP |
8997 | Note that insert_breakpoints won't try to re-insert |
8998 | already inserted breakpoints. Therefore, we don't | |
8999 | care if breakpoints were already inserted, or not. */ | |
a9ba6bae | 9000 | |
31e77af2 PA |
9001 | /* If we need to step over a breakpoint, and we're not using |
9002 | displaced stepping to do so, insert all breakpoints | |
9003 | (watchpoints, etc.) but the one we're stepping over, step one | |
9004 | instruction, and then re-insert the breakpoint when that step | |
9005 | is finished. */ | |
963f9c80 | 9006 | |
6c4cfb24 PA |
9007 | step_what = thread_still_needs_step_over (ecs->event_thread); |
9008 | ||
963f9c80 | 9009 | remove_bp = (ecs->hit_singlestep_breakpoint |
6c4cfb24 PA |
9010 | || (step_what & STEP_OVER_BREAKPOINT)); |
9011 | remove_wps = (step_what & STEP_OVER_WATCHPOINT); | |
963f9c80 | 9012 | |
cb71640d PA |
9013 | /* We can't use displaced stepping if we need to step past a |
9014 | watchpoint. The instruction copied to the scratch pad would | |
9015 | still trigger the watchpoint. */ | |
9016 | if (remove_bp | |
3fc8eb30 | 9017 | && (remove_wps || !use_displaced_stepping (ecs->event_thread))) |
45e8c884 | 9018 | { |
f9582a22 | 9019 | set_step_over_info (ecs->event_thread->inf->aspace.get (), |
21edc42f YQ |
9020 | regcache_read_pc (regcache), remove_wps, |
9021 | ecs->event_thread->global_num); | |
45e8c884 | 9022 | } |
963f9c80 | 9023 | else if (remove_wps) |
03acd4d8 | 9024 | set_step_over_info (nullptr, 0, remove_wps, -1); |
372316f1 PA |
9025 | |
9026 | /* If we now need to do an in-line step-over, we need to stop | |
9027 | all other threads. Note this must be done before | |
9028 | insert_breakpoints below, because that removes the breakpoint | |
9029 | we're about to step over, otherwise other threads could miss | |
9030 | it. */ | |
fbea99ea | 9031 | if (step_over_info_valid_p () && target_is_non_stop_p ()) |
4f5539f0 | 9032 | stop_all_threads ("starting in-line step-over"); |
abbb1732 | 9033 | |
31e77af2 | 9034 | /* Stop stepping if inserting breakpoints fails. */ |
a70b8144 | 9035 | try |
31e77af2 PA |
9036 | { |
9037 | insert_breakpoints (); | |
9038 | } | |
230d2906 | 9039 | catch (const gdb_exception_error &e) |
31e77af2 PA |
9040 | { |
9041 | exception_print (gdb_stderr, e); | |
22bcd14b | 9042 | stop_waiting (ecs); |
bdf2a94a | 9043 | clear_step_over_info (); |
31e77af2 | 9044 | return; |
d4f3574e SS |
9045 | } |
9046 | ||
963f9c80 | 9047 | ecs->event_thread->control.trap_expected = (remove_bp || remove_wps); |
d4f3574e | 9048 | |
1edb66d8 | 9049 | resume (ecs->event_thread->stop_signal ()); |
d4f3574e SS |
9050 | } |
9051 | ||
488f131b | 9052 | prepare_to_wait (ecs); |
d4f3574e SS |
9053 | } |
9054 | ||
4d9d9d04 PA |
9055 | /* Called when we should continue running the inferior, because the |
9056 | current event doesn't cause a user visible stop. This does the | |
9057 | resuming part; waiting for the next event is done elsewhere. */ | |
9058 | ||
9059 | static void | |
9060 | keep_going (struct execution_control_state *ecs) | |
9061 | { | |
9062 | if (ecs->event_thread->control.trap_expected | |
1edb66d8 | 9063 | && ecs->event_thread->stop_signal () == GDB_SIGNAL_TRAP) |
4d9d9d04 PA |
9064 | ecs->event_thread->control.trap_expected = 0; |
9065 | ||
1edb66d8 SM |
9066 | if (!signal_program[ecs->event_thread->stop_signal ()]) |
9067 | ecs->event_thread->set_stop_signal (GDB_SIGNAL_0); | |
4d9d9d04 PA |
9068 | keep_going_pass_signal (ecs); |
9069 | } | |
9070 | ||
104c1213 JM |
9071 | /* This function normally comes after a resume, before |
9072 | handle_inferior_event exits. It takes care of any last bits of | |
9073 | housekeeping, and sets the all-important wait_some_more flag. */ | |
cd0fc7c3 | 9074 | |
104c1213 JM |
9075 | static void |
9076 | prepare_to_wait (struct execution_control_state *ecs) | |
cd0fc7c3 | 9077 | { |
1eb8556f | 9078 | infrun_debug_printf ("prepare_to_wait"); |
104c1213 | 9079 | |
104c1213 | 9080 | ecs->wait_some_more = 1; |
0b333c5e | 9081 | |
42bd97a6 PA |
9082 | /* If the target can't async, emulate it by marking the infrun event |
9083 | handler such that as soon as we get back to the event-loop, we | |
9084 | immediately end up in fetch_inferior_event again calling | |
9085 | target_wait. */ | |
9086 | if (!target_can_async_p ()) | |
0b333c5e | 9087 | mark_infrun_async_event_handler (); |
c906108c | 9088 | } |
11cf8741 | 9089 | |
fd664c91 | 9090 | /* We are done with the step range of a step/next/si/ni command. |
b57bacec | 9091 | Called once for each n of a "step n" operation. */ |
fd664c91 PA |
9092 | |
9093 | static void | |
bdc36728 | 9094 | end_stepping_range (struct execution_control_state *ecs) |
fd664c91 | 9095 | { |
bdc36728 | 9096 | ecs->event_thread->control.stop_step = 1; |
bdc36728 | 9097 | stop_waiting (ecs); |
fd664c91 PA |
9098 | } |
9099 | ||
33d62d64 JK |
9100 | /* Several print_*_reason functions to print why the inferior has stopped. |
9101 | We always print something when the inferior exits, or receives a signal. | |
9102 | The rest of the cases are dealt with later on in normal_stop and | |
9103 | print_it_typical. Ideally there should be a call to one of these | |
9104 | print_*_reason functions functions from handle_inferior_event each time | |
22bcd14b | 9105 | stop_waiting is called. |
33d62d64 | 9106 | |
fd664c91 PA |
9107 | Note that we don't call these directly, instead we delegate that to |
9108 | the interpreters, through observers. Interpreters then call these | |
9109 | with whatever uiout is right. */ | |
33d62d64 | 9110 | |
fd664c91 PA |
9111 | void |
9112 | print_signal_exited_reason (struct ui_out *uiout, enum gdb_signal siggnal) | |
11cf8741 | 9113 | { |
33d62d64 | 9114 | annotate_signalled (); |
112e8700 SM |
9115 | if (uiout->is_mi_like_p ()) |
9116 | uiout->field_string | |
9117 | ("reason", async_reason_lookup (EXEC_ASYNC_EXITED_SIGNALLED)); | |
9118 | uiout->text ("\nProgram terminated with signal "); | |
33d62d64 | 9119 | annotate_signal_name (); |
112e8700 | 9120 | uiout->field_string ("signal-name", |
2ea28649 | 9121 | gdb_signal_to_name (siggnal)); |
33d62d64 | 9122 | annotate_signal_name_end (); |
112e8700 | 9123 | uiout->text (", "); |
33d62d64 | 9124 | annotate_signal_string (); |
112e8700 | 9125 | uiout->field_string ("signal-meaning", |
2ea28649 | 9126 | gdb_signal_to_string (siggnal)); |
33d62d64 | 9127 | annotate_signal_string_end (); |
112e8700 SM |
9128 | uiout->text (".\n"); |
9129 | uiout->text ("The program no longer exists.\n"); | |
33d62d64 JK |
9130 | } |
9131 | ||
fd664c91 PA |
9132 | void |
9133 | print_exited_reason (struct ui_out *uiout, int exitstatus) | |
33d62d64 | 9134 | { |
fda326dd | 9135 | struct inferior *inf = current_inferior (); |
a068643d | 9136 | std::string pidstr = target_pid_to_str (ptid_t (inf->pid)); |
fda326dd | 9137 | |
33d62d64 JK |
9138 | annotate_exited (exitstatus); |
9139 | if (exitstatus) | |
9140 | { | |
112e8700 SM |
9141 | if (uiout->is_mi_like_p ()) |
9142 | uiout->field_string ("reason", async_reason_lookup (EXEC_ASYNC_EXITED)); | |
6a831f06 PA |
9143 | std::string exit_code_str |
9144 | = string_printf ("0%o", (unsigned int) exitstatus); | |
9145 | uiout->message ("[Inferior %s (%s) exited with code %pF]\n", | |
9146 | plongest (inf->num), pidstr.c_str (), | |
9147 | string_field ("exit-code", exit_code_str.c_str ())); | |
33d62d64 JK |
9148 | } |
9149 | else | |
11cf8741 | 9150 | { |
112e8700 SM |
9151 | if (uiout->is_mi_like_p ()) |
9152 | uiout->field_string | |
9153 | ("reason", async_reason_lookup (EXEC_ASYNC_EXITED_NORMALLY)); | |
6a831f06 PA |
9154 | uiout->message ("[Inferior %s (%s) exited normally]\n", |
9155 | plongest (inf->num), pidstr.c_str ()); | |
33d62d64 | 9156 | } |
33d62d64 JK |
9157 | } |
9158 | ||
fd664c91 PA |
9159 | void |
9160 | print_signal_received_reason (struct ui_out *uiout, enum gdb_signal siggnal) | |
33d62d64 | 9161 | { |
f303dbd6 PA |
9162 | struct thread_info *thr = inferior_thread (); |
9163 | ||
bb079752 AB |
9164 | infrun_debug_printf ("signal = %s", gdb_signal_to_string (siggnal)); |
9165 | ||
33d62d64 JK |
9166 | annotate_signal (); |
9167 | ||
112e8700 | 9168 | if (uiout->is_mi_like_p ()) |
f303dbd6 PA |
9169 | ; |
9170 | else if (show_thread_that_caused_stop ()) | |
33d62d64 | 9171 | { |
112e8700 | 9172 | uiout->text ("\nThread "); |
33eca680 | 9173 | uiout->field_string ("thread-id", print_thread_id (thr)); |
f303dbd6 | 9174 | |
25558938 | 9175 | const char *name = thread_name (thr); |
03acd4d8 | 9176 | if (name != nullptr) |
f303dbd6 | 9177 | { |
112e8700 | 9178 | uiout->text (" \""); |
33eca680 | 9179 | uiout->field_string ("name", name); |
112e8700 | 9180 | uiout->text ("\""); |
f303dbd6 | 9181 | } |
33d62d64 | 9182 | } |
f303dbd6 | 9183 | else |
112e8700 | 9184 | uiout->text ("\nProgram"); |
f303dbd6 | 9185 | |
112e8700 SM |
9186 | if (siggnal == GDB_SIGNAL_0 && !uiout->is_mi_like_p ()) |
9187 | uiout->text (" stopped"); | |
33d62d64 JK |
9188 | else |
9189 | { | |
112e8700 | 9190 | uiout->text (" received signal "); |
8b93c638 | 9191 | annotate_signal_name (); |
112e8700 SM |
9192 | if (uiout->is_mi_like_p ()) |
9193 | uiout->field_string | |
9194 | ("reason", async_reason_lookup (EXEC_ASYNC_SIGNAL_RECEIVED)); | |
9195 | uiout->field_string ("signal-name", gdb_signal_to_name (siggnal)); | |
8b93c638 | 9196 | annotate_signal_name_end (); |
112e8700 | 9197 | uiout->text (", "); |
8b93c638 | 9198 | annotate_signal_string (); |
112e8700 | 9199 | uiout->field_string ("signal-meaning", gdb_signal_to_string (siggnal)); |
012b3a21 | 9200 | |
9c742269 | 9201 | regcache *regcache = get_thread_regcache (thr); |
272bb05c JB |
9202 | struct gdbarch *gdbarch = regcache->arch (); |
9203 | if (gdbarch_report_signal_info_p (gdbarch)) | |
9204 | gdbarch_report_signal_info (gdbarch, uiout, siggnal); | |
9205 | ||
8b93c638 | 9206 | annotate_signal_string_end (); |
33d62d64 | 9207 | } |
112e8700 | 9208 | uiout->text (".\n"); |
33d62d64 | 9209 | } |
252fbfc8 | 9210 | |
fd664c91 PA |
9211 | void |
9212 | print_no_history_reason (struct ui_out *uiout) | |
33d62d64 | 9213 | { |
37f54063 BL |
9214 | if (uiout->is_mi_like_p ()) |
9215 | uiout->field_string ("reason", async_reason_lookup (EXEC_ASYNC_NO_HISTORY)); | |
9216 | else | |
9217 | uiout->text ("\nNo more reverse-execution history.\n"); | |
11cf8741 | 9218 | } |
43ff13b4 | 9219 | |
0c7e1a46 PA |
9220 | /* Print current location without a level number, if we have changed |
9221 | functions or hit a breakpoint. Print source line if we have one. | |
9222 | bpstat_print contains the logic deciding in detail what to print, | |
9223 | based on the event(s) that just occurred. */ | |
9224 | ||
243a9253 | 9225 | static void |
c272a98c | 9226 | print_stop_location (const target_waitstatus &ws) |
0c7e1a46 PA |
9227 | { |
9228 | int bpstat_ret; | |
f486487f | 9229 | enum print_what source_flag; |
0c7e1a46 PA |
9230 | int do_frame_printing = 1; |
9231 | struct thread_info *tp = inferior_thread (); | |
9232 | ||
c272a98c | 9233 | bpstat_ret = bpstat_print (tp->control.stop_bpstat, ws.kind ()); |
0c7e1a46 PA |
9234 | switch (bpstat_ret) |
9235 | { | |
9236 | case PRINT_UNKNOWN: | |
9237 | /* FIXME: cagney/2002-12-01: Given that a frame ID does (or | |
9238 | should) carry around the function and does (or should) use | |
9239 | that when doing a frame comparison. */ | |
9240 | if (tp->control.stop_step | |
a0cbd650 TT |
9241 | && (tp->control.step_frame_id |
9242 | == get_frame_id (get_current_frame ())) | |
f2ffa92b | 9243 | && (tp->control.step_start_function |
1edb66d8 | 9244 | == find_pc_function (tp->stop_pc ()))) |
0c7e1a46 PA |
9245 | { |
9246 | /* Finished step, just print source line. */ | |
9247 | source_flag = SRC_LINE; | |
9248 | } | |
9249 | else | |
9250 | { | |
9251 | /* Print location and source line. */ | |
9252 | source_flag = SRC_AND_LOC; | |
9253 | } | |
9254 | break; | |
9255 | case PRINT_SRC_AND_LOC: | |
9256 | /* Print location and source line. */ | |
9257 | source_flag = SRC_AND_LOC; | |
9258 | break; | |
9259 | case PRINT_SRC_ONLY: | |
9260 | source_flag = SRC_LINE; | |
9261 | break; | |
9262 | case PRINT_NOTHING: | |
9263 | /* Something bogus. */ | |
9264 | source_flag = SRC_LINE; | |
9265 | do_frame_printing = 0; | |
9266 | break; | |
9267 | default: | |
f34652de | 9268 | internal_error (_("Unknown value.")); |
0c7e1a46 PA |
9269 | } |
9270 | ||
9271 | /* The behavior of this routine with respect to the source | |
9272 | flag is: | |
9273 | SRC_LINE: Print only source line | |
9274 | LOCATION: Print only location | |
9275 | SRC_AND_LOC: Print location and source line. */ | |
9276 | if (do_frame_printing) | |
03acd4d8 | 9277 | print_stack_frame (get_selected_frame (nullptr), 0, source_flag, 1); |
243a9253 PA |
9278 | } |
9279 | ||
243a9253 PA |
9280 | /* See infrun.h. */ |
9281 | ||
9282 | void | |
4c7d57e7 | 9283 | print_stop_event (struct ui_out *uiout, bool displays) |
243a9253 | 9284 | { |
243a9253 | 9285 | struct target_waitstatus last; |
243a9253 PA |
9286 | struct thread_info *tp; |
9287 | ||
5b6d1e4f | 9288 | get_last_target_status (nullptr, nullptr, &last); |
243a9253 | 9289 | |
67ad9399 TT |
9290 | { |
9291 | scoped_restore save_uiout = make_scoped_restore (¤t_uiout, uiout); | |
0c7e1a46 | 9292 | |
c272a98c | 9293 | print_stop_location (last); |
243a9253 | 9294 | |
67ad9399 | 9295 | /* Display the auto-display expressions. */ |
4c7d57e7 TT |
9296 | if (displays) |
9297 | do_displays (); | |
67ad9399 | 9298 | } |
243a9253 PA |
9299 | |
9300 | tp = inferior_thread (); | |
573269a8 LS |
9301 | if (tp->thread_fsm () != nullptr |
9302 | && tp->thread_fsm ()->finished_p ()) | |
243a9253 PA |
9303 | { |
9304 | struct return_value_info *rv; | |
9305 | ||
573269a8 LS |
9306 | rv = tp->thread_fsm ()->return_value (); |
9307 | if (rv != nullptr) | |
243a9253 PA |
9308 | print_return_value (uiout, rv); |
9309 | } | |
0c7e1a46 PA |
9310 | } |
9311 | ||
388a7084 PA |
9312 | /* See infrun.h. */ |
9313 | ||
9314 | void | |
9315 | maybe_remove_breakpoints (void) | |
9316 | { | |
55f6301a | 9317 | if (!breakpoints_should_be_inserted_now () && target_has_execution ()) |
388a7084 PA |
9318 | { |
9319 | if (remove_breakpoints ()) | |
9320 | { | |
223ffa71 | 9321 | target_terminal::ours_for_output (); |
6cb06a8c TT |
9322 | gdb_printf (_("Cannot remove breakpoints because " |
9323 | "program is no longer writable.\nFurther " | |
9324 | "execution is probably impossible.\n")); | |
388a7084 PA |
9325 | } |
9326 | } | |
9327 | } | |
9328 | ||
4c2f2a79 PA |
9329 | /* The execution context that just caused a normal stop. */ |
9330 | ||
9331 | struct stop_context | |
9332 | { | |
2d844eaf | 9333 | stop_context (); |
2d844eaf TT |
9334 | |
9335 | DISABLE_COPY_AND_ASSIGN (stop_context); | |
9336 | ||
9337 | bool changed () const; | |
9338 | ||
4c2f2a79 PA |
9339 | /* The stop ID. */ |
9340 | ULONGEST stop_id; | |
c906108c | 9341 | |
4c2f2a79 | 9342 | /* The event PTID. */ |
c906108c | 9343 | |
4c2f2a79 PA |
9344 | ptid_t ptid; |
9345 | ||
9346 | /* If stopp for a thread event, this is the thread that caused the | |
9347 | stop. */ | |
d634cd0b | 9348 | thread_info_ref thread; |
4c2f2a79 PA |
9349 | |
9350 | /* The inferior that caused the stop. */ | |
9351 | int inf_num; | |
9352 | }; | |
9353 | ||
2d844eaf | 9354 | /* Initializes a new stop context. If stopped for a thread event, this |
4c2f2a79 PA |
9355 | takes a strong reference to the thread. */ |
9356 | ||
2d844eaf | 9357 | stop_context::stop_context () |
4c2f2a79 | 9358 | { |
2d844eaf TT |
9359 | stop_id = get_stop_id (); |
9360 | ptid = inferior_ptid; | |
9361 | inf_num = current_inferior ()->num; | |
4c2f2a79 | 9362 | |
d7e15655 | 9363 | if (inferior_ptid != null_ptid) |
4c2f2a79 PA |
9364 | { |
9365 | /* Take a strong reference so that the thread can't be deleted | |
9366 | yet. */ | |
d634cd0b | 9367 | thread = thread_info_ref::new_reference (inferior_thread ()); |
4c2f2a79 | 9368 | } |
4c2f2a79 PA |
9369 | } |
9370 | ||
9371 | /* Return true if the current context no longer matches the saved stop | |
9372 | context. */ | |
9373 | ||
2d844eaf TT |
9374 | bool |
9375 | stop_context::changed () const | |
9376 | { | |
9377 | if (ptid != inferior_ptid) | |
9378 | return true; | |
9379 | if (inf_num != current_inferior ()->num) | |
9380 | return true; | |
03acd4d8 | 9381 | if (thread != nullptr && thread->state != THREAD_STOPPED) |
2d844eaf TT |
9382 | return true; |
9383 | if (get_stop_id () != stop_id) | |
9384 | return true; | |
9385 | return false; | |
4c2f2a79 PA |
9386 | } |
9387 | ||
9388 | /* See infrun.h. */ | |
9389 | ||
8dd08de7 AB |
9390 | bool |
9391 | normal_stop () | |
c906108c | 9392 | { |
73b65bb0 | 9393 | struct target_waitstatus last; |
73b65bb0 | 9394 | |
5b6d1e4f | 9395 | get_last_target_status (nullptr, nullptr, &last); |
73b65bb0 | 9396 | |
4c2f2a79 PA |
9397 | new_stop_id (); |
9398 | ||
29f49a6a PA |
9399 | /* If an exception is thrown from this point on, make sure to |
9400 | propagate GDB's knowledge of the executing state to the | |
9401 | frontend/user running state. A QUIT is an easy exception to see | |
9402 | here, so do this before any filtered output. */ | |
731f534f | 9403 | |
5b6d1e4f | 9404 | ptid_t finish_ptid = null_ptid; |
731f534f | 9405 | |
c35b1492 | 9406 | if (!non_stop) |
5b6d1e4f | 9407 | finish_ptid = minus_one_ptid; |
183be222 SM |
9408 | else if (last.kind () == TARGET_WAITKIND_SIGNALLED |
9409 | || last.kind () == TARGET_WAITKIND_EXITED) | |
e1316e60 PA |
9410 | { |
9411 | /* On some targets, we may still have live threads in the | |
9412 | inferior when we get a process exit event. E.g., for | |
9413 | "checkpoint", when the current checkpoint/fork exits, | |
9414 | linux-fork.c automatically switches to another fork from | |
9415 | within target_mourn_inferior. */ | |
731f534f | 9416 | if (inferior_ptid != null_ptid) |
5b6d1e4f | 9417 | finish_ptid = ptid_t (inferior_ptid.pid ()); |
e1316e60 | 9418 | } |
9488c327 PA |
9419 | else if (last.kind () != TARGET_WAITKIND_NO_RESUMED |
9420 | && last.kind () != TARGET_WAITKIND_THREAD_EXITED) | |
5b6d1e4f PA |
9421 | finish_ptid = inferior_ptid; |
9422 | ||
6b09f134 | 9423 | std::optional<scoped_finish_thread_state> maybe_finish_thread_state; |
5b6d1e4f PA |
9424 | if (finish_ptid != null_ptid) |
9425 | { | |
9426 | maybe_finish_thread_state.emplace | |
9427 | (user_visible_resume_target (finish_ptid), finish_ptid); | |
9428 | } | |
29f49a6a | 9429 | |
b57bacec PA |
9430 | /* As we're presenting a stop, and potentially removing breakpoints, |
9431 | update the thread list so we can tell whether there are threads | |
9432 | running on the target. With target remote, for example, we can | |
9433 | only learn about new threads when we explicitly update the thread | |
9434 | list. Do this before notifying the interpreters about signal | |
9435 | stops, end of stepping ranges, etc., so that the "new thread" | |
9436 | output is emitted before e.g., "Program received signal FOO", | |
9437 | instead of after. */ | |
9438 | update_thread_list (); | |
9439 | ||
183be222 | 9440 | if (last.kind () == TARGET_WAITKIND_STOPPED && stopped_by_random_signal) |
3f75a984 | 9441 | notify_signal_received (inferior_thread ()->stop_signal ()); |
b57bacec | 9442 | |
c906108c SS |
9443 | /* As with the notification of thread events, we want to delay |
9444 | notifying the user that we've switched thread context until | |
9445 | the inferior actually stops. | |
9446 | ||
73b65bb0 DJ |
9447 | There's no point in saying anything if the inferior has exited. |
9448 | Note that SIGNALLED here means "exited with a signal", not | |
b65dc60b PA |
9449 | "received a signal". |
9450 | ||
9451 | Also skip saying anything in non-stop mode. In that mode, as we | |
9452 | don't want GDB to switch threads behind the user's back, to avoid | |
9453 | races where the user is typing a command to apply to thread x, | |
9454 | but GDB switches to thread y before the user finishes entering | |
9455 | the command, fetch_inferior_event installs a cleanup to restore | |
9456 | the current thread back to the thread the user had selected right | |
9457 | after this event is handled, so we're not really switching, only | |
9458 | informing of a stop. */ | |
a81871f7 | 9459 | if (!non_stop) |
c906108c | 9460 | { |
a81871f7 PA |
9461 | if ((last.kind () != TARGET_WAITKIND_SIGNALLED |
9462 | && last.kind () != TARGET_WAITKIND_EXITED | |
9488c327 PA |
9463 | && last.kind () != TARGET_WAITKIND_NO_RESUMED |
9464 | && last.kind () != TARGET_WAITKIND_THREAD_EXITED) | |
a81871f7 PA |
9465 | && target_has_execution () |
9466 | && previous_thread != inferior_thread ()) | |
3b12939d | 9467 | { |
a81871f7 PA |
9468 | SWITCH_THRU_ALL_UIS () |
9469 | { | |
9470 | target_terminal::ours_for_output (); | |
9471 | gdb_printf (_("[Switching to %s]\n"), | |
9472 | target_pid_to_str (inferior_ptid).c_str ()); | |
9473 | annotate_thread_changed (); | |
9474 | } | |
3b12939d | 9475 | } |
a81871f7 PA |
9476 | |
9477 | update_previous_thread (); | |
c906108c | 9478 | } |
c906108c | 9479 | |
9488c327 PA |
9480 | if (last.kind () == TARGET_WAITKIND_NO_RESUMED |
9481 | || last.kind () == TARGET_WAITKIND_THREAD_EXITED) | |
0e5bf2a8 | 9482 | { |
21d48304 PA |
9483 | stop_print_frame = false; |
9484 | ||
0e454242 | 9485 | SWITCH_THRU_ALL_UIS () |
3b12939d PA |
9486 | if (current_ui->prompt_state == PROMPT_BLOCKED) |
9487 | { | |
223ffa71 | 9488 | target_terminal::ours_for_output (); |
9488c327 PA |
9489 | if (last.kind () == TARGET_WAITKIND_NO_RESUMED) |
9490 | gdb_printf (_("No unwaited-for children left.\n")); | |
9491 | else if (last.kind () == TARGET_WAITKIND_THREAD_EXITED) | |
9492 | gdb_printf (_("Command aborted, thread exited.\n")); | |
9493 | else | |
9494 | gdb_assert_not_reached ("unhandled"); | |
3b12939d | 9495 | } |
0e5bf2a8 PA |
9496 | } |
9497 | ||
b57bacec | 9498 | /* Note: this depends on the update_thread_list call above. */ |
388a7084 | 9499 | maybe_remove_breakpoints (); |
c906108c | 9500 | |
c906108c SS |
9501 | /* If an auto-display called a function and that got a signal, |
9502 | delete that auto-display to avoid an infinite recursion. */ | |
9503 | ||
9504 | if (stopped_by_random_signal) | |
9505 | disable_current_display (); | |
9506 | ||
0e454242 | 9507 | SWITCH_THRU_ALL_UIS () |
3b12939d PA |
9508 | { |
9509 | async_enable_stdin (); | |
9510 | } | |
c906108c | 9511 | |
388a7084 | 9512 | /* Let the user/frontend see the threads as stopped. */ |
731f534f | 9513 | maybe_finish_thread_state.reset (); |
388a7084 PA |
9514 | |
9515 | /* Select innermost stack frame - i.e., current frame is frame 0, | |
9516 | and current location is based on that. Handle the case where the | |
9517 | dummy call is returning after being stopped. E.g. the dummy call | |
9518 | previously hit a breakpoint. (If the dummy call returns | |
9519 | normally, we won't reach here.) Do this before the stop hook is | |
9520 | run, so that it doesn't get to see the temporary dummy frame, | |
9521 | which is not where we'll present the stop. */ | |
9522 | if (has_stack_frames ()) | |
9523 | { | |
9524 | if (stop_stack_dummy == STOP_STACK_DUMMY) | |
9525 | { | |
9526 | /* Pop the empty frame that contains the stack dummy. This | |
9527 | also restores inferior state prior to the call (struct | |
9528 | infcall_suspend_state). */ | |
bd2b40ac | 9529 | frame_info_ptr frame = get_current_frame (); |
388a7084 PA |
9530 | |
9531 | gdb_assert (get_frame_type (frame) == DUMMY_FRAME); | |
9532 | frame_pop (frame); | |
9533 | /* frame_pop calls reinit_frame_cache as the last thing it | |
9534 | does which means there's now no selected frame. */ | |
9535 | } | |
9536 | ||
9537 | select_frame (get_current_frame ()); | |
9538 | ||
9539 | /* Set the current source location. */ | |
9540 | set_current_sal_from_frame (get_current_frame ()); | |
9541 | } | |
dd7e2d2b PA |
9542 | |
9543 | /* Look up the hook_stop and run it (CLI internally handles problem | |
9544 | of stop_command's pre-hook not existing). */ | |
49a82d50 | 9545 | stop_context saved_context; |
4c2f2a79 | 9546 | |
49a82d50 TT |
9547 | try |
9548 | { | |
9549 | execute_cmd_pre_hook (stop_command); | |
4c2f2a79 | 9550 | } |
b1ffd112 | 9551 | catch (const gdb_exception_error &ex) |
49a82d50 TT |
9552 | { |
9553 | exception_fprintf (gdb_stderr, ex, | |
9554 | "Error while running hook_stop:\n"); | |
9555 | } | |
9556 | ||
9557 | /* If the stop hook resumes the target, then there's no point in | |
9558 | trying to notify about the previous stop; its context is | |
9559 | gone. Likewise if the command switches thread or inferior -- | |
9560 | the observers would print a stop for the wrong | |
9561 | thread/inferior. */ | |
9562 | if (saved_context.changed ()) | |
8dd08de7 | 9563 | return true; |
dd7e2d2b | 9564 | |
388a7084 PA |
9565 | /* Notify observers about the stop. This is where the interpreters |
9566 | print the stop event. */ | |
87829267 SM |
9567 | notify_normal_stop ((inferior_ptid != null_ptid |
9568 | ? inferior_thread ()->control.stop_bpstat | |
9569 | : nullptr), | |
9570 | stop_print_frame); | |
243a9253 PA |
9571 | annotate_stopped (); |
9572 | ||
55f6301a | 9573 | if (target_has_execution ()) |
48844aa6 | 9574 | { |
183be222 SM |
9575 | if (last.kind () != TARGET_WAITKIND_SIGNALLED |
9576 | && last.kind () != TARGET_WAITKIND_EXITED | |
9488c327 PA |
9577 | && last.kind () != TARGET_WAITKIND_NO_RESUMED |
9578 | && last.kind () != TARGET_WAITKIND_THREAD_EXITED) | |
48844aa6 PA |
9579 | /* Delete the breakpoint we stopped at, if it wants to be deleted. |
9580 | Delete any breakpoint that is to be deleted at the next stop. */ | |
16c381f0 | 9581 | breakpoint_auto_delete (inferior_thread ()->control.stop_bpstat); |
94cc34af | 9582 | } |
6c95b8df | 9583 | |
8dd08de7 | 9584 | return false; |
c906108c | 9585 | } |
c906108c | 9586 | \f |
c5aa993b | 9587 | int |
96baa820 | 9588 | signal_stop_state (int signo) |
c906108c | 9589 | { |
d6b48e9c | 9590 | return signal_stop[signo]; |
c906108c SS |
9591 | } |
9592 | ||
c5aa993b | 9593 | int |
96baa820 | 9594 | signal_print_state (int signo) |
c906108c SS |
9595 | { |
9596 | return signal_print[signo]; | |
9597 | } | |
9598 | ||
c5aa993b | 9599 | int |
96baa820 | 9600 | signal_pass_state (int signo) |
c906108c SS |
9601 | { |
9602 | return signal_program[signo]; | |
9603 | } | |
9604 | ||
2455069d UW |
9605 | static void |
9606 | signal_cache_update (int signo) | |
9607 | { | |
9608 | if (signo == -1) | |
9609 | { | |
a493e3e2 | 9610 | for (signo = 0; signo < (int) GDB_SIGNAL_LAST; signo++) |
2455069d UW |
9611 | signal_cache_update (signo); |
9612 | ||
9613 | return; | |
9614 | } | |
9615 | ||
9616 | signal_pass[signo] = (signal_stop[signo] == 0 | |
9617 | && signal_print[signo] == 0 | |
ab04a2af TT |
9618 | && signal_program[signo] == 1 |
9619 | && signal_catch[signo] == 0); | |
2455069d UW |
9620 | } |
9621 | ||
488f131b | 9622 | int |
7bda5e4a | 9623 | signal_stop_update (int signo, int state) |
d4f3574e SS |
9624 | { |
9625 | int ret = signal_stop[signo]; | |
abbb1732 | 9626 | |
d4f3574e | 9627 | signal_stop[signo] = state; |
2455069d | 9628 | signal_cache_update (signo); |
d4f3574e SS |
9629 | return ret; |
9630 | } | |
9631 | ||
488f131b | 9632 | int |
7bda5e4a | 9633 | signal_print_update (int signo, int state) |
d4f3574e SS |
9634 | { |
9635 | int ret = signal_print[signo]; | |
abbb1732 | 9636 | |
d4f3574e | 9637 | signal_print[signo] = state; |
2455069d | 9638 | signal_cache_update (signo); |
d4f3574e SS |
9639 | return ret; |
9640 | } | |
9641 | ||
488f131b | 9642 | int |
7bda5e4a | 9643 | signal_pass_update (int signo, int state) |
d4f3574e SS |
9644 | { |
9645 | int ret = signal_program[signo]; | |
abbb1732 | 9646 | |
d4f3574e | 9647 | signal_program[signo] = state; |
2455069d | 9648 | signal_cache_update (signo); |
d4f3574e SS |
9649 | return ret; |
9650 | } | |
9651 | ||
ab04a2af TT |
9652 | /* Update the global 'signal_catch' from INFO and notify the |
9653 | target. */ | |
9654 | ||
9655 | void | |
9656 | signal_catch_update (const unsigned int *info) | |
9657 | { | |
9658 | int i; | |
9659 | ||
9660 | for (i = 0; i < GDB_SIGNAL_LAST; ++i) | |
9661 | signal_catch[i] = info[i] > 0; | |
9662 | signal_cache_update (-1); | |
adc6a863 | 9663 | target_pass_signals (signal_pass); |
ab04a2af TT |
9664 | } |
9665 | ||
c906108c | 9666 | static void |
96baa820 | 9667 | sig_print_header (void) |
c906108c | 9668 | { |
6cb06a8c TT |
9669 | gdb_printf (_("Signal Stop\tPrint\tPass " |
9670 | "to program\tDescription\n")); | |
c906108c SS |
9671 | } |
9672 | ||
9673 | static void | |
2ea28649 | 9674 | sig_print_info (enum gdb_signal oursig) |
c906108c | 9675 | { |
2ea28649 | 9676 | const char *name = gdb_signal_to_name (oursig); |
c906108c | 9677 | int name_padding = 13 - strlen (name); |
96baa820 | 9678 | |
c906108c SS |
9679 | if (name_padding <= 0) |
9680 | name_padding = 0; | |
9681 | ||
6cb06a8c TT |
9682 | gdb_printf ("%s", name); |
9683 | gdb_printf ("%*.*s ", name_padding, name_padding, " "); | |
9684 | gdb_printf ("%s\t", signal_stop[oursig] ? "Yes" : "No"); | |
9685 | gdb_printf ("%s\t", signal_print[oursig] ? "Yes" : "No"); | |
9686 | gdb_printf ("%s\t\t", signal_program[oursig] ? "Yes" : "No"); | |
9687 | gdb_printf ("%s\n", gdb_signal_to_string (oursig)); | |
c906108c SS |
9688 | } |
9689 | ||
9690 | /* Specify how various signals in the inferior should be handled. */ | |
9691 | ||
9692 | static void | |
0b39b52e | 9693 | handle_command (const char *args, int from_tty) |
c906108c | 9694 | { |
c906108c | 9695 | int digits, wordlen; |
b926417a | 9696 | int sigfirst, siglast; |
2ea28649 | 9697 | enum gdb_signal oursig; |
c906108c | 9698 | int allsigs; |
c906108c | 9699 | |
03acd4d8 | 9700 | if (args == nullptr) |
c906108c | 9701 | { |
e2e0b3e5 | 9702 | error_no_arg (_("signal to handle")); |
c906108c SS |
9703 | } |
9704 | ||
1777feb0 | 9705 | /* Allocate and zero an array of flags for which signals to handle. */ |
c906108c | 9706 | |
adc6a863 PA |
9707 | const size_t nsigs = GDB_SIGNAL_LAST; |
9708 | unsigned char sigs[nsigs] {}; | |
c906108c | 9709 | |
1777feb0 | 9710 | /* Break the command line up into args. */ |
c906108c | 9711 | |
773a1edc | 9712 | gdb_argv built_argv (args); |
c906108c SS |
9713 | |
9714 | /* Walk through the args, looking for signal oursigs, signal names, and | |
9715 | actions. Signal numbers and signal names may be interspersed with | |
9716 | actions, with the actions being performed for all signals cumulatively | |
1777feb0 | 9717 | specified. Signal ranges can be specified as <LOW>-<HIGH>. */ |
c906108c | 9718 | |
773a1edc | 9719 | for (char *arg : built_argv) |
c906108c | 9720 | { |
773a1edc TT |
9721 | wordlen = strlen (arg); |
9722 | for (digits = 0; isdigit (arg[digits]); digits++) | |
c906108c SS |
9723 | {; |
9724 | } | |
9725 | allsigs = 0; | |
9726 | sigfirst = siglast = -1; | |
9727 | ||
773a1edc | 9728 | if (wordlen >= 1 && !strncmp (arg, "all", wordlen)) |
c906108c SS |
9729 | { |
9730 | /* Apply action to all signals except those used by the | |
1777feb0 | 9731 | debugger. Silently skip those. */ |
c906108c SS |
9732 | allsigs = 1; |
9733 | sigfirst = 0; | |
9734 | siglast = nsigs - 1; | |
9735 | } | |
773a1edc | 9736 | else if (wordlen >= 1 && !strncmp (arg, "stop", wordlen)) |
c906108c SS |
9737 | { |
9738 | SET_SIGS (nsigs, sigs, signal_stop); | |
9739 | SET_SIGS (nsigs, sigs, signal_print); | |
9740 | } | |
773a1edc | 9741 | else if (wordlen >= 1 && !strncmp (arg, "ignore", wordlen)) |
c906108c SS |
9742 | { |
9743 | UNSET_SIGS (nsigs, sigs, signal_program); | |
9744 | } | |
773a1edc | 9745 | else if (wordlen >= 2 && !strncmp (arg, "print", wordlen)) |
c906108c SS |
9746 | { |
9747 | SET_SIGS (nsigs, sigs, signal_print); | |
9748 | } | |
773a1edc | 9749 | else if (wordlen >= 2 && !strncmp (arg, "pass", wordlen)) |
c906108c SS |
9750 | { |
9751 | SET_SIGS (nsigs, sigs, signal_program); | |
9752 | } | |
773a1edc | 9753 | else if (wordlen >= 3 && !strncmp (arg, "nostop", wordlen)) |
c906108c SS |
9754 | { |
9755 | UNSET_SIGS (nsigs, sigs, signal_stop); | |
9756 | } | |
773a1edc | 9757 | else if (wordlen >= 3 && !strncmp (arg, "noignore", wordlen)) |
c906108c SS |
9758 | { |
9759 | SET_SIGS (nsigs, sigs, signal_program); | |
9760 | } | |
773a1edc | 9761 | else if (wordlen >= 4 && !strncmp (arg, "noprint", wordlen)) |
c906108c SS |
9762 | { |
9763 | UNSET_SIGS (nsigs, sigs, signal_print); | |
9764 | UNSET_SIGS (nsigs, sigs, signal_stop); | |
9765 | } | |
773a1edc | 9766 | else if (wordlen >= 4 && !strncmp (arg, "nopass", wordlen)) |
c906108c SS |
9767 | { |
9768 | UNSET_SIGS (nsigs, sigs, signal_program); | |
9769 | } | |
9770 | else if (digits > 0) | |
9771 | { | |
9772 | /* It is numeric. The numeric signal refers to our own | |
9773 | internal signal numbering from target.h, not to host/target | |
9774 | signal number. This is a feature; users really should be | |
9775 | using symbolic names anyway, and the common ones like | |
9776 | SIGHUP, SIGINT, SIGALRM, etc. will work right anyway. */ | |
9777 | ||
9778 | sigfirst = siglast = (int) | |
773a1edc TT |
9779 | gdb_signal_from_command (atoi (arg)); |
9780 | if (arg[digits] == '-') | |
c906108c SS |
9781 | { |
9782 | siglast = (int) | |
773a1edc | 9783 | gdb_signal_from_command (atoi (arg + digits + 1)); |
c906108c SS |
9784 | } |
9785 | if (sigfirst > siglast) | |
9786 | { | |
1777feb0 | 9787 | /* Bet he didn't figure we'd think of this case... */ |
b926417a | 9788 | std::swap (sigfirst, siglast); |
c906108c SS |
9789 | } |
9790 | } | |
9791 | else | |
9792 | { | |
773a1edc | 9793 | oursig = gdb_signal_from_name (arg); |
a493e3e2 | 9794 | if (oursig != GDB_SIGNAL_UNKNOWN) |
c906108c SS |
9795 | { |
9796 | sigfirst = siglast = (int) oursig; | |
9797 | } | |
9798 | else | |
9799 | { | |
9800 | /* Not a number and not a recognized flag word => complain. */ | |
773a1edc | 9801 | error (_("Unrecognized or ambiguous flag word: \"%s\"."), arg); |
c906108c SS |
9802 | } |
9803 | } | |
9804 | ||
9805 | /* If any signal numbers or symbol names were found, set flags for | |
dda83cd7 | 9806 | which signals to apply actions to. */ |
c906108c | 9807 | |
b926417a | 9808 | for (int signum = sigfirst; signum >= 0 && signum <= siglast; signum++) |
c906108c | 9809 | { |
2ea28649 | 9810 | switch ((enum gdb_signal) signum) |
c906108c | 9811 | { |
a493e3e2 PA |
9812 | case GDB_SIGNAL_TRAP: |
9813 | case GDB_SIGNAL_INT: | |
c906108c SS |
9814 | if (!allsigs && !sigs[signum]) |
9815 | { | |
9e2f0ad4 | 9816 | if (query (_("%s is used by the debugger.\n\ |
3e43a32a | 9817 | Are you sure you want to change it? "), |
2ea28649 | 9818 | gdb_signal_to_name ((enum gdb_signal) signum))) |
c906108c SS |
9819 | { |
9820 | sigs[signum] = 1; | |
9821 | } | |
9822 | else | |
6cb06a8c | 9823 | gdb_printf (_("Not confirmed, unchanged.\n")); |
c906108c SS |
9824 | } |
9825 | break; | |
a493e3e2 PA |
9826 | case GDB_SIGNAL_0: |
9827 | case GDB_SIGNAL_DEFAULT: | |
9828 | case GDB_SIGNAL_UNKNOWN: | |
c906108c SS |
9829 | /* Make sure that "all" doesn't print these. */ |
9830 | break; | |
9831 | default: | |
9832 | sigs[signum] = 1; | |
9833 | break; | |
9834 | } | |
9835 | } | |
c906108c SS |
9836 | } |
9837 | ||
b926417a | 9838 | for (int signum = 0; signum < nsigs; signum++) |
3a031f65 PA |
9839 | if (sigs[signum]) |
9840 | { | |
2455069d | 9841 | signal_cache_update (-1); |
adc6a863 PA |
9842 | target_pass_signals (signal_pass); |
9843 | target_program_signals (signal_program); | |
c906108c | 9844 | |
3a031f65 PA |
9845 | if (from_tty) |
9846 | { | |
9847 | /* Show the results. */ | |
9848 | sig_print_header (); | |
9849 | for (; signum < nsigs; signum++) | |
9850 | if (sigs[signum]) | |
aead7601 | 9851 | sig_print_info ((enum gdb_signal) signum); |
3a031f65 PA |
9852 | } |
9853 | ||
9854 | break; | |
9855 | } | |
c906108c SS |
9856 | } |
9857 | ||
de0bea00 MF |
9858 | /* Complete the "handle" command. */ |
9859 | ||
eb3ff9a5 | 9860 | static void |
de0bea00 | 9861 | handle_completer (struct cmd_list_element *ignore, |
eb3ff9a5 | 9862 | completion_tracker &tracker, |
6f937416 | 9863 | const char *text, const char *word) |
de0bea00 | 9864 | { |
de0bea00 MF |
9865 | static const char * const keywords[] = |
9866 | { | |
9867 | "all", | |
9868 | "stop", | |
9869 | "ignore", | |
9870 | "print", | |
9871 | "pass", | |
9872 | "nostop", | |
9873 | "noignore", | |
9874 | "noprint", | |
9875 | "nopass", | |
03acd4d8 | 9876 | nullptr, |
de0bea00 MF |
9877 | }; |
9878 | ||
eb3ff9a5 PA |
9879 | signal_completer (ignore, tracker, text, word); |
9880 | complete_on_enum (tracker, keywords, word, word); | |
de0bea00 MF |
9881 | } |
9882 | ||
2ea28649 PA |
9883 | enum gdb_signal |
9884 | gdb_signal_from_command (int num) | |
ed01b82c PA |
9885 | { |
9886 | if (num >= 1 && num <= 15) | |
2ea28649 | 9887 | return (enum gdb_signal) num; |
ed01b82c PA |
9888 | error (_("Only signals 1-15 are valid as numeric signals.\n\ |
9889 | Use \"info signals\" for a list of symbolic signals.")); | |
9890 | } | |
9891 | ||
c906108c SS |
9892 | /* Print current contents of the tables set by the handle command. |
9893 | It is possible we should just be printing signals actually used | |
9894 | by the current target (but for things to work right when switching | |
9895 | targets, all signals should be in the signal tables). */ | |
9896 | ||
9897 | static void | |
1d12d88f | 9898 | info_signals_command (const char *signum_exp, int from_tty) |
c906108c | 9899 | { |
2ea28649 | 9900 | enum gdb_signal oursig; |
abbb1732 | 9901 | |
c906108c SS |
9902 | sig_print_header (); |
9903 | ||
9904 | if (signum_exp) | |
9905 | { | |
9906 | /* First see if this is a symbol name. */ | |
2ea28649 | 9907 | oursig = gdb_signal_from_name (signum_exp); |
a493e3e2 | 9908 | if (oursig == GDB_SIGNAL_UNKNOWN) |
c906108c SS |
9909 | { |
9910 | /* No, try numeric. */ | |
9911 | oursig = | |
2ea28649 | 9912 | gdb_signal_from_command (parse_and_eval_long (signum_exp)); |
c906108c SS |
9913 | } |
9914 | sig_print_info (oursig); | |
9915 | return; | |
9916 | } | |
9917 | ||
6cb06a8c | 9918 | gdb_printf ("\n"); |
c906108c | 9919 | /* These ugly casts brought to you by the native VAX compiler. */ |
a493e3e2 PA |
9920 | for (oursig = GDB_SIGNAL_FIRST; |
9921 | (int) oursig < (int) GDB_SIGNAL_LAST; | |
2ea28649 | 9922 | oursig = (enum gdb_signal) ((int) oursig + 1)) |
c906108c SS |
9923 | { |
9924 | QUIT; | |
9925 | ||
a493e3e2 PA |
9926 | if (oursig != GDB_SIGNAL_UNKNOWN |
9927 | && oursig != GDB_SIGNAL_DEFAULT && oursig != GDB_SIGNAL_0) | |
c906108c SS |
9928 | sig_print_info (oursig); |
9929 | } | |
9930 | ||
6cb06a8c TT |
9931 | gdb_printf (_("\nUse the \"handle\" command " |
9932 | "to change these tables.\n")); | |
c906108c | 9933 | } |
4aa995e1 PA |
9934 | |
9935 | /* The $_siginfo convenience variable is a bit special. We don't know | |
9936 | for sure the type of the value until we actually have a chance to | |
7a9dd1b2 | 9937 | fetch the data. The type can change depending on gdbarch, so it is |
4aa995e1 PA |
9938 | also dependent on which thread you have selected. |
9939 | ||
9940 | 1. making $_siginfo be an internalvar that creates a new value on | |
9941 | access. | |
9942 | ||
9943 | 2. making the value of $_siginfo be an lval_computed value. */ | |
9944 | ||
9945 | /* This function implements the lval_computed support for reading a | |
9946 | $_siginfo value. */ | |
9947 | ||
9948 | static void | |
9949 | siginfo_value_read (struct value *v) | |
9950 | { | |
9951 | LONGEST transferred; | |
9952 | ||
a911d87a PA |
9953 | /* If we can access registers, so can we access $_siginfo. Likewise |
9954 | vice versa. */ | |
9955 | validate_registers_access (); | |
c709acd1 | 9956 | |
4aa995e1 | 9957 | transferred = |
328d42d8 SM |
9958 | target_read (current_inferior ()->top_target (), |
9959 | TARGET_OBJECT_SIGNAL_INFO, | |
03acd4d8 | 9960 | nullptr, |
bbe912ba | 9961 | v->contents_all_raw ().data (), |
76675c4d | 9962 | v->offset (), |
d0c97917 | 9963 | v->type ()->length ()); |
4aa995e1 | 9964 | |
d0c97917 | 9965 | if (transferred != v->type ()->length ()) |
4aa995e1 PA |
9966 | error (_("Unable to read siginfo")); |
9967 | } | |
9968 | ||
9969 | /* This function implements the lval_computed support for writing a | |
9970 | $_siginfo value. */ | |
9971 | ||
9972 | static void | |
9973 | siginfo_value_write (struct value *v, struct value *fromval) | |
9974 | { | |
9975 | LONGEST transferred; | |
9976 | ||
a911d87a PA |
9977 | /* If we can access registers, so can we access $_siginfo. Likewise |
9978 | vice versa. */ | |
9979 | validate_registers_access (); | |
c709acd1 | 9980 | |
328d42d8 | 9981 | transferred = target_write (current_inferior ()->top_target (), |
4aa995e1 | 9982 | TARGET_OBJECT_SIGNAL_INFO, |
03acd4d8 | 9983 | nullptr, |
bbe912ba | 9984 | fromval->contents_all_raw ().data (), |
76675c4d | 9985 | v->offset (), |
d0c97917 | 9986 | fromval->type ()->length ()); |
4aa995e1 | 9987 | |
d0c97917 | 9988 | if (transferred != fromval->type ()->length ()) |
4aa995e1 PA |
9989 | error (_("Unable to write siginfo")); |
9990 | } | |
9991 | ||
c8f2448a | 9992 | static const struct lval_funcs siginfo_value_funcs = |
4aa995e1 PA |
9993 | { |
9994 | siginfo_value_read, | |
9995 | siginfo_value_write | |
9996 | }; | |
9997 | ||
9998 | /* Return a new value with the correct type for the siginfo object of | |
78267919 UW |
9999 | the current thread using architecture GDBARCH. Return a void value |
10000 | if there's no object available. */ | |
4aa995e1 | 10001 | |
2c0b251b | 10002 | static struct value * |
22d2b532 SDJ |
10003 | siginfo_make_value (struct gdbarch *gdbarch, struct internalvar *var, |
10004 | void *ignore) | |
4aa995e1 | 10005 | { |
841de120 | 10006 | if (target_has_stack () |
d7e15655 | 10007 | && inferior_ptid != null_ptid |
78267919 | 10008 | && gdbarch_get_siginfo_type_p (gdbarch)) |
4aa995e1 | 10009 | { |
78267919 | 10010 | struct type *type = gdbarch_get_siginfo_type (gdbarch); |
abbb1732 | 10011 | |
b64e2602 | 10012 | return value::allocate_computed (type, &siginfo_value_funcs, nullptr); |
4aa995e1 PA |
10013 | } |
10014 | ||
317c3ed9 | 10015 | return value::allocate (builtin_type (gdbarch)->builtin_void); |
4aa995e1 PA |
10016 | } |
10017 | ||
c906108c | 10018 | \f |
16c381f0 JK |
10019 | /* infcall_suspend_state contains state about the program itself like its |
10020 | registers and any signal it received when it last stopped. | |
10021 | This state must be restored regardless of how the inferior function call | |
10022 | ends (either successfully, or after it hits a breakpoint or signal) | |
10023 | if the program is to properly continue where it left off. */ | |
10024 | ||
6bf78e29 | 10025 | class infcall_suspend_state |
7a292a7a | 10026 | { |
6bf78e29 AB |
10027 | public: |
10028 | /* Capture state from GDBARCH, TP, and REGCACHE that must be restored | |
10029 | once the inferior function call has finished. */ | |
10030 | infcall_suspend_state (struct gdbarch *gdbarch, | |
dda83cd7 SM |
10031 | const struct thread_info *tp, |
10032 | struct regcache *regcache) | |
1edb66d8 | 10033 | : m_registers (new readonly_detached_regcache (*regcache)) |
6bf78e29 | 10034 | { |
1edb66d8 SM |
10035 | tp->save_suspend_to (m_thread_suspend); |
10036 | ||
6bf78e29 AB |
10037 | gdb::unique_xmalloc_ptr<gdb_byte> siginfo_data; |
10038 | ||
10039 | if (gdbarch_get_siginfo_type_p (gdbarch)) | |
10040 | { | |
dda83cd7 | 10041 | struct type *type = gdbarch_get_siginfo_type (gdbarch); |
df86565b | 10042 | size_t len = type->length (); |
6bf78e29 | 10043 | |
dda83cd7 | 10044 | siginfo_data.reset ((gdb_byte *) xmalloc (len)); |
6bf78e29 | 10045 | |
328d42d8 | 10046 | if (target_read (current_inferior ()->top_target (), |
03acd4d8 | 10047 | TARGET_OBJECT_SIGNAL_INFO, nullptr, |
dda83cd7 SM |
10048 | siginfo_data.get (), 0, len) != len) |
10049 | { | |
10050 | /* Errors ignored. */ | |
10051 | siginfo_data.reset (nullptr); | |
10052 | } | |
6bf78e29 AB |
10053 | } |
10054 | ||
10055 | if (siginfo_data) | |
10056 | { | |
dda83cd7 SM |
10057 | m_siginfo_gdbarch = gdbarch; |
10058 | m_siginfo_data = std::move (siginfo_data); | |
6bf78e29 AB |
10059 | } |
10060 | } | |
10061 | ||
10062 | /* Return a pointer to the stored register state. */ | |
16c381f0 | 10063 | |
6bf78e29 AB |
10064 | readonly_detached_regcache *registers () const |
10065 | { | |
10066 | return m_registers.get (); | |
10067 | } | |
10068 | ||
10069 | /* Restores the stored state into GDBARCH, TP, and REGCACHE. */ | |
10070 | ||
10071 | void restore (struct gdbarch *gdbarch, | |
dda83cd7 SM |
10072 | struct thread_info *tp, |
10073 | struct regcache *regcache) const | |
6bf78e29 | 10074 | { |
1edb66d8 | 10075 | tp->restore_suspend_from (m_thread_suspend); |
6bf78e29 AB |
10076 | |
10077 | if (m_siginfo_gdbarch == gdbarch) | |
10078 | { | |
dda83cd7 | 10079 | struct type *type = gdbarch_get_siginfo_type (gdbarch); |
6bf78e29 | 10080 | |
dda83cd7 | 10081 | /* Errors ignored. */ |
328d42d8 | 10082 | target_write (current_inferior ()->top_target (), |
03acd4d8 | 10083 | TARGET_OBJECT_SIGNAL_INFO, nullptr, |
df86565b | 10084 | m_siginfo_data.get (), 0, type->length ()); |
6bf78e29 AB |
10085 | } |
10086 | ||
10087 | /* The inferior can be gone if the user types "print exit(0)" | |
10088 | (and perhaps other times). */ | |
55f6301a | 10089 | if (target_has_execution ()) |
6bf78e29 AB |
10090 | /* NB: The register write goes through to the target. */ |
10091 | regcache->restore (registers ()); | |
10092 | } | |
10093 | ||
10094 | private: | |
10095 | /* How the current thread stopped before the inferior function call was | |
10096 | executed. */ | |
10097 | struct thread_suspend_state m_thread_suspend; | |
10098 | ||
10099 | /* The registers before the inferior function call was executed. */ | |
10100 | std::unique_ptr<readonly_detached_regcache> m_registers; | |
1736ad11 | 10101 | |
35515841 | 10102 | /* Format of SIGINFO_DATA or NULL if it is not present. */ |
6bf78e29 | 10103 | struct gdbarch *m_siginfo_gdbarch = nullptr; |
1736ad11 JK |
10104 | |
10105 | /* The inferior format depends on SIGINFO_GDBARCH and it has a length of | |
df86565b | 10106 | gdbarch_get_siginfo_type ()->length (). For different gdbarch the |
1736ad11 | 10107 | content would be invalid. */ |
6bf78e29 | 10108 | gdb::unique_xmalloc_ptr<gdb_byte> m_siginfo_data; |
b89667eb DE |
10109 | }; |
10110 | ||
cb524840 TT |
10111 | infcall_suspend_state_up |
10112 | save_infcall_suspend_state () | |
b89667eb | 10113 | { |
b89667eb | 10114 | struct thread_info *tp = inferior_thread (); |
9c742269 | 10115 | regcache *regcache = get_thread_regcache (tp); |
ac7936df | 10116 | struct gdbarch *gdbarch = regcache->arch (); |
1736ad11 | 10117 | |
6bf78e29 AB |
10118 | infcall_suspend_state_up inf_state |
10119 | (new struct infcall_suspend_state (gdbarch, tp, regcache)); | |
1736ad11 | 10120 | |
6bf78e29 AB |
10121 | /* Having saved the current state, adjust the thread state, discarding |
10122 | any stop signal information. The stop signal is not useful when | |
10123 | starting an inferior function call, and run_inferior_call will not use | |
10124 | the signal due to its `proceed' call with GDB_SIGNAL_0. */ | |
1edb66d8 | 10125 | tp->set_stop_signal (GDB_SIGNAL_0); |
35515841 | 10126 | |
b89667eb DE |
10127 | return inf_state; |
10128 | } | |
10129 | ||
10130 | /* Restore inferior session state to INF_STATE. */ | |
10131 | ||
10132 | void | |
16c381f0 | 10133 | restore_infcall_suspend_state (struct infcall_suspend_state *inf_state) |
b89667eb DE |
10134 | { |
10135 | struct thread_info *tp = inferior_thread (); | |
9c742269 | 10136 | regcache *regcache = get_thread_regcache (inferior_thread ()); |
ac7936df | 10137 | struct gdbarch *gdbarch = regcache->arch (); |
b89667eb | 10138 | |
6bf78e29 | 10139 | inf_state->restore (gdbarch, tp, regcache); |
16c381f0 | 10140 | discard_infcall_suspend_state (inf_state); |
b89667eb DE |
10141 | } |
10142 | ||
b89667eb | 10143 | void |
16c381f0 | 10144 | discard_infcall_suspend_state (struct infcall_suspend_state *inf_state) |
b89667eb | 10145 | { |
dd848631 | 10146 | delete inf_state; |
b89667eb DE |
10147 | } |
10148 | ||
daf6667d | 10149 | readonly_detached_regcache * |
16c381f0 | 10150 | get_infcall_suspend_state_regcache (struct infcall_suspend_state *inf_state) |
b89667eb | 10151 | { |
6bf78e29 | 10152 | return inf_state->registers (); |
b89667eb DE |
10153 | } |
10154 | ||
16c381f0 JK |
10155 | /* infcall_control_state contains state regarding gdb's control of the |
10156 | inferior itself like stepping control. It also contains session state like | |
10157 | the user's currently selected frame. */ | |
b89667eb | 10158 | |
16c381f0 | 10159 | struct infcall_control_state |
b89667eb | 10160 | { |
16c381f0 JK |
10161 | struct thread_control_state thread_control; |
10162 | struct inferior_control_state inferior_control; | |
d82142e2 JK |
10163 | |
10164 | /* Other fields: */ | |
ee841dd8 TT |
10165 | enum stop_stack_kind stop_stack_dummy = STOP_NONE; |
10166 | int stopped_by_random_signal = 0; | |
7a292a7a | 10167 | |
79952e69 PA |
10168 | /* ID and level of the selected frame when the inferior function |
10169 | call was made. */ | |
ee841dd8 | 10170 | struct frame_id selected_frame_id {}; |
79952e69 | 10171 | int selected_frame_level = -1; |
7a292a7a SS |
10172 | }; |
10173 | ||
c906108c | 10174 | /* Save all of the information associated with the inferior<==>gdb |
b89667eb | 10175 | connection. */ |
c906108c | 10176 | |
cb524840 TT |
10177 | infcall_control_state_up |
10178 | save_infcall_control_state () | |
c906108c | 10179 | { |
cb524840 | 10180 | infcall_control_state_up inf_status (new struct infcall_control_state); |
4e1c45ea | 10181 | struct thread_info *tp = inferior_thread (); |
d6b48e9c | 10182 | struct inferior *inf = current_inferior (); |
7a292a7a | 10183 | |
16c381f0 JK |
10184 | inf_status->thread_control = tp->control; |
10185 | inf_status->inferior_control = inf->control; | |
d82142e2 | 10186 | |
03acd4d8 CL |
10187 | tp->control.step_resume_breakpoint = nullptr; |
10188 | tp->control.exception_resume_breakpoint = nullptr; | |
8358c15c | 10189 | |
16c381f0 JK |
10190 | /* Save original bpstat chain to INF_STATUS; replace it in TP with copy of |
10191 | chain. If caller's caller is walking the chain, they'll be happier if we | |
10192 | hand them back the original chain when restore_infcall_control_state is | |
10193 | called. */ | |
10194 | tp->control.stop_bpstat = bpstat_copy (tp->control.stop_bpstat); | |
d82142e2 JK |
10195 | |
10196 | /* Other fields: */ | |
10197 | inf_status->stop_stack_dummy = stop_stack_dummy; | |
10198 | inf_status->stopped_by_random_signal = stopped_by_random_signal; | |
c5aa993b | 10199 | |
79952e69 PA |
10200 | save_selected_frame (&inf_status->selected_frame_id, |
10201 | &inf_status->selected_frame_level); | |
b89667eb | 10202 | |
7a292a7a | 10203 | return inf_status; |
c906108c SS |
10204 | } |
10205 | ||
b89667eb DE |
10206 | /* Restore inferior session state to INF_STATUS. */ |
10207 | ||
c906108c | 10208 | void |
16c381f0 | 10209 | restore_infcall_control_state (struct infcall_control_state *inf_status) |
c906108c | 10210 | { |
4e1c45ea | 10211 | struct thread_info *tp = inferior_thread (); |
d6b48e9c | 10212 | struct inferior *inf = current_inferior (); |
4e1c45ea | 10213 | |
8358c15c JK |
10214 | if (tp->control.step_resume_breakpoint) |
10215 | tp->control.step_resume_breakpoint->disposition = disp_del_at_next_stop; | |
10216 | ||
5b79abe7 TT |
10217 | if (tp->control.exception_resume_breakpoint) |
10218 | tp->control.exception_resume_breakpoint->disposition | |
10219 | = disp_del_at_next_stop; | |
10220 | ||
d82142e2 | 10221 | /* Handle the bpstat_copy of the chain. */ |
16c381f0 | 10222 | bpstat_clear (&tp->control.stop_bpstat); |
d82142e2 | 10223 | |
16c381f0 JK |
10224 | tp->control = inf_status->thread_control; |
10225 | inf->control = inf_status->inferior_control; | |
d82142e2 JK |
10226 | |
10227 | /* Other fields: */ | |
10228 | stop_stack_dummy = inf_status->stop_stack_dummy; | |
10229 | stopped_by_random_signal = inf_status->stopped_by_random_signal; | |
c906108c | 10230 | |
841de120 | 10231 | if (target_has_stack ()) |
c906108c | 10232 | { |
79952e69 PA |
10233 | restore_selected_frame (inf_status->selected_frame_id, |
10234 | inf_status->selected_frame_level); | |
c906108c | 10235 | } |
c906108c | 10236 | |
ee841dd8 | 10237 | delete inf_status; |
7a292a7a | 10238 | } |
c906108c SS |
10239 | |
10240 | void | |
16c381f0 | 10241 | discard_infcall_control_state (struct infcall_control_state *inf_status) |
7a292a7a | 10242 | { |
8358c15c JK |
10243 | if (inf_status->thread_control.step_resume_breakpoint) |
10244 | inf_status->thread_control.step_resume_breakpoint->disposition | |
10245 | = disp_del_at_next_stop; | |
10246 | ||
5b79abe7 TT |
10247 | if (inf_status->thread_control.exception_resume_breakpoint) |
10248 | inf_status->thread_control.exception_resume_breakpoint->disposition | |
10249 | = disp_del_at_next_stop; | |
10250 | ||
1777feb0 | 10251 | /* See save_infcall_control_state for info on stop_bpstat. */ |
16c381f0 | 10252 | bpstat_clear (&inf_status->thread_control.stop_bpstat); |
8358c15c | 10253 | |
ee841dd8 | 10254 | delete inf_status; |
7a292a7a | 10255 | } |
b89667eb | 10256 | \f |
7f89fd65 | 10257 | /* See infrun.h. */ |
0c557179 SDJ |
10258 | |
10259 | void | |
10260 | clear_exit_convenience_vars (void) | |
10261 | { | |
10262 | clear_internalvar (lookup_internalvar ("_exitsignal")); | |
10263 | clear_internalvar (lookup_internalvar ("_exitcode")); | |
10264 | } | |
c5aa993b | 10265 | \f |
488f131b | 10266 | |
b2175913 MS |
10267 | /* User interface for reverse debugging: |
10268 | Set exec-direction / show exec-direction commands | |
10269 | (returns error unless target implements to_set_exec_direction method). */ | |
10270 | ||
170742de | 10271 | enum exec_direction_kind execution_direction = EXEC_FORWARD; |
b2175913 MS |
10272 | static const char exec_forward[] = "forward"; |
10273 | static const char exec_reverse[] = "reverse"; | |
10274 | static const char *exec_direction = exec_forward; | |
40478521 | 10275 | static const char *const exec_direction_names[] = { |
b2175913 MS |
10276 | exec_forward, |
10277 | exec_reverse, | |
03acd4d8 | 10278 | nullptr |
b2175913 MS |
10279 | }; |
10280 | ||
10281 | static void | |
eb4c3f4a | 10282 | set_exec_direction_func (const char *args, int from_tty, |
b2175913 MS |
10283 | struct cmd_list_element *cmd) |
10284 | { | |
05374cfd | 10285 | if (target_can_execute_reverse ()) |
b2175913 MS |
10286 | { |
10287 | if (!strcmp (exec_direction, exec_forward)) | |
10288 | execution_direction = EXEC_FORWARD; | |
10289 | else if (!strcmp (exec_direction, exec_reverse)) | |
10290 | execution_direction = EXEC_REVERSE; | |
10291 | } | |
8bbed405 MS |
10292 | else |
10293 | { | |
10294 | exec_direction = exec_forward; | |
10295 | error (_("Target does not support this operation.")); | |
10296 | } | |
b2175913 MS |
10297 | } |
10298 | ||
10299 | static void | |
10300 | show_exec_direction_func (struct ui_file *out, int from_tty, | |
10301 | struct cmd_list_element *cmd, const char *value) | |
10302 | { | |
10303 | switch (execution_direction) { | |
10304 | case EXEC_FORWARD: | |
6cb06a8c | 10305 | gdb_printf (out, _("Forward.\n")); |
b2175913 MS |
10306 | break; |
10307 | case EXEC_REVERSE: | |
6cb06a8c | 10308 | gdb_printf (out, _("Reverse.\n")); |
b2175913 | 10309 | break; |
b2175913 | 10310 | default: |
f34652de | 10311 | internal_error (_("bogus execution_direction value: %d"), |
d8b34453 | 10312 | (int) execution_direction); |
b2175913 MS |
10313 | } |
10314 | } | |
10315 | ||
d4db2f36 PA |
10316 | static void |
10317 | show_schedule_multiple (struct ui_file *file, int from_tty, | |
10318 | struct cmd_list_element *c, const char *value) | |
10319 | { | |
6cb06a8c TT |
10320 | gdb_printf (file, _("Resuming the execution of threads " |
10321 | "of all processes is %s.\n"), value); | |
d4db2f36 | 10322 | } |
ad52ddc6 | 10323 | |
22d2b532 SDJ |
10324 | /* Implementation of `siginfo' variable. */ |
10325 | ||
10326 | static const struct internalvar_funcs siginfo_funcs = | |
10327 | { | |
10328 | siginfo_make_value, | |
03acd4d8 | 10329 | nullptr, |
22d2b532 SDJ |
10330 | }; |
10331 | ||
372316f1 PA |
10332 | /* Callback for infrun's target events source. This is marked when a |
10333 | thread has a pending status to process. */ | |
10334 | ||
10335 | static void | |
10336 | infrun_async_inferior_event_handler (gdb_client_data data) | |
10337 | { | |
6b36ddeb | 10338 | clear_async_event_handler (infrun_async_inferior_event_token); |
b1a35af2 | 10339 | inferior_event_handler (INF_REG_EVENT); |
372316f1 PA |
10340 | } |
10341 | ||
8087c3fa | 10342 | #if GDB_SELF_TEST |
b161a60d SM |
10343 | namespace selftests |
10344 | { | |
10345 | ||
10346 | /* Verify that when two threads with the same ptid exist (from two different | |
10347 | targets) and one of them changes ptid, we only update inferior_ptid if | |
10348 | it is appropriate. */ | |
10349 | ||
10350 | static void | |
10351 | infrun_thread_ptid_changed () | |
10352 | { | |
27b1f19f | 10353 | gdbarch *arch = current_inferior ()->arch (); |
b161a60d SM |
10354 | |
10355 | /* The thread which inferior_ptid represents changes ptid. */ | |
10356 | { | |
10357 | scoped_restore_current_pspace_and_thread restore; | |
10358 | ||
10359 | scoped_mock_context<test_target_ops> target1 (arch); | |
10360 | scoped_mock_context<test_target_ops> target2 (arch); | |
b161a60d SM |
10361 | |
10362 | ptid_t old_ptid (111, 222); | |
10363 | ptid_t new_ptid (111, 333); | |
10364 | ||
10365 | target1.mock_inferior.pid = old_ptid.pid (); | |
10366 | target1.mock_thread.ptid = old_ptid; | |
922cc93d SM |
10367 | target1.mock_inferior.ptid_thread_map.clear (); |
10368 | target1.mock_inferior.ptid_thread_map[old_ptid] = &target1.mock_thread; | |
10369 | ||
b161a60d SM |
10370 | target2.mock_inferior.pid = old_ptid.pid (); |
10371 | target2.mock_thread.ptid = old_ptid; | |
922cc93d SM |
10372 | target2.mock_inferior.ptid_thread_map.clear (); |
10373 | target2.mock_inferior.ptid_thread_map[old_ptid] = &target2.mock_thread; | |
b161a60d SM |
10374 | |
10375 | auto restore_inferior_ptid = make_scoped_restore (&inferior_ptid, old_ptid); | |
10376 | set_current_inferior (&target1.mock_inferior); | |
10377 | ||
10378 | thread_change_ptid (&target1.mock_target, old_ptid, new_ptid); | |
10379 | ||
10380 | gdb_assert (inferior_ptid == new_ptid); | |
10381 | } | |
10382 | ||
10383 | /* A thread with the same ptid as inferior_ptid, but from another target, | |
10384 | changes ptid. */ | |
10385 | { | |
10386 | scoped_restore_current_pspace_and_thread restore; | |
10387 | ||
10388 | scoped_mock_context<test_target_ops> target1 (arch); | |
10389 | scoped_mock_context<test_target_ops> target2 (arch); | |
b161a60d SM |
10390 | |
10391 | ptid_t old_ptid (111, 222); | |
10392 | ptid_t new_ptid (111, 333); | |
10393 | ||
10394 | target1.mock_inferior.pid = old_ptid.pid (); | |
10395 | target1.mock_thread.ptid = old_ptid; | |
922cc93d SM |
10396 | target1.mock_inferior.ptid_thread_map.clear (); |
10397 | target1.mock_inferior.ptid_thread_map[old_ptid] = &target1.mock_thread; | |
10398 | ||
b161a60d SM |
10399 | target2.mock_inferior.pid = old_ptid.pid (); |
10400 | target2.mock_thread.ptid = old_ptid; | |
922cc93d SM |
10401 | target2.mock_inferior.ptid_thread_map.clear (); |
10402 | target2.mock_inferior.ptid_thread_map[old_ptid] = &target2.mock_thread; | |
b161a60d SM |
10403 | |
10404 | auto restore_inferior_ptid = make_scoped_restore (&inferior_ptid, old_ptid); | |
10405 | set_current_inferior (&target2.mock_inferior); | |
10406 | ||
10407 | thread_change_ptid (&target1.mock_target, old_ptid, new_ptid); | |
10408 | ||
10409 | gdb_assert (inferior_ptid == old_ptid); | |
10410 | } | |
10411 | } | |
10412 | ||
10413 | } /* namespace selftests */ | |
10414 | ||
8087c3fa JB |
10415 | #endif /* GDB_SELF_TEST */ |
10416 | ||
6c265988 | 10417 | void _initialize_infrun (); |
c906108c | 10418 | void |
6c265988 | 10419 | _initialize_infrun () |
c906108c | 10420 | { |
de0bea00 | 10421 | struct cmd_list_element *c; |
c906108c | 10422 | |
372316f1 PA |
10423 | /* Register extra event sources in the event loop. */ |
10424 | infrun_async_inferior_event_token | |
03acd4d8 | 10425 | = create_async_event_handler (infrun_async_inferior_event_handler, nullptr, |
db20ebdf | 10426 | "infrun"); |
372316f1 | 10427 | |
e0f25bd9 SM |
10428 | cmd_list_element *info_signals_cmd |
10429 | = add_info ("signals", info_signals_command, _("\ | |
1bedd215 AC |
10430 | What debugger does when program gets various signals.\n\ |
10431 | Specify a signal as argument to print info on that signal only.")); | |
e0f25bd9 | 10432 | add_info_alias ("handle", info_signals_cmd, 0); |
c906108c | 10433 | |
de0bea00 | 10434 | c = add_com ("handle", class_run, handle_command, _("\ |
dfbd5e7b | 10435 | Specify how to handle signals.\n\ |
486c7739 | 10436 | Usage: handle SIGNAL [ACTIONS]\n\ |
c906108c | 10437 | Args are signals and actions to apply to those signals.\n\ |
dfbd5e7b | 10438 | If no actions are specified, the current settings for the specified signals\n\ |
486c7739 MF |
10439 | will be displayed instead.\n\ |
10440 | \n\ | |
c906108c SS |
10441 | Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\ |
10442 | from 1-15 are allowed for compatibility with old versions of GDB.\n\ | |
10443 | Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\ | |
10444 | The special arg \"all\" is recognized to mean all signals except those\n\ | |
1bedd215 | 10445 | used by the debugger, typically SIGTRAP and SIGINT.\n\ |
486c7739 | 10446 | \n\ |
1bedd215 | 10447 | Recognized actions include \"stop\", \"nostop\", \"print\", \"noprint\",\n\ |
c906108c SS |
10448 | \"pass\", \"nopass\", \"ignore\", or \"noignore\".\n\ |
10449 | Stop means reenter debugger if this signal happens (implies print).\n\ | |
10450 | Print means print a message if this signal happens.\n\ | |
10451 | Pass means let program see this signal; otherwise program doesn't know.\n\ | |
10452 | Ignore is a synonym for nopass and noignore is a synonym for pass.\n\ | |
dfbd5e7b PA |
10453 | Pass and Stop may be combined.\n\ |
10454 | \n\ | |
10455 | Multiple signals may be specified. Signal numbers and signal names\n\ | |
10456 | may be interspersed with actions, with the actions being performed for\n\ | |
10457 | all signals cumulatively specified.")); | |
de0bea00 | 10458 | set_cmd_completer (c, handle_completer); |
486c7739 | 10459 | |
49a82d50 TT |
10460 | stop_command = add_cmd ("stop", class_obscure, |
10461 | not_just_help_class_command, _("\ | |
1a966eab | 10462 | There is no `stop' command, but you can set a hook on `stop'.\n\ |
c906108c | 10463 | This allows you to set a list of commands to be run each time execution\n\ |
1a966eab | 10464 | of the program stops."), &cmdlist); |
c906108c | 10465 | |
94ba44a6 SM |
10466 | add_setshow_boolean_cmd |
10467 | ("infrun", class_maintenance, &debug_infrun, | |
10468 | _("Set inferior debugging."), | |
10469 | _("Show inferior debugging."), | |
10470 | _("When non-zero, inferior specific debugging is enabled."), | |
03acd4d8 | 10471 | nullptr, show_debug_infrun, &setdebuglist, &showdebuglist); |
527159b7 | 10472 | |
ad52ddc6 PA |
10473 | add_setshow_boolean_cmd ("non-stop", no_class, |
10474 | &non_stop_1, _("\ | |
10475 | Set whether gdb controls the inferior in non-stop mode."), _("\ | |
10476 | Show whether gdb controls the inferior in non-stop mode."), _("\ | |
10477 | When debugging a multi-threaded program and this setting is\n\ | |
10478 | off (the default, also called all-stop mode), when one thread stops\n\ | |
10479 | (for a breakpoint, watchpoint, exception, or similar events), GDB stops\n\ | |
10480 | all other threads in the program while you interact with the thread of\n\ | |
10481 | interest. When you continue or step a thread, you can allow the other\n\ | |
10482 | threads to run, or have them remain stopped, but while you inspect any\n\ | |
10483 | thread's state, all threads stop.\n\ | |
10484 | \n\ | |
10485 | In non-stop mode, when one thread stops, other threads can continue\n\ | |
10486 | to run freely. You'll be able to step each thread independently,\n\ | |
10487 | leave it stopped or free to run as needed."), | |
10488 | set_non_stop, | |
10489 | show_non_stop, | |
10490 | &setlist, | |
10491 | &showlist); | |
10492 | ||
adc6a863 | 10493 | for (size_t i = 0; i < GDB_SIGNAL_LAST; i++) |
c906108c SS |
10494 | { |
10495 | signal_stop[i] = 1; | |
10496 | signal_print[i] = 1; | |
10497 | signal_program[i] = 1; | |
ab04a2af | 10498 | signal_catch[i] = 0; |
c906108c SS |
10499 | } |
10500 | ||
4d9d9d04 PA |
10501 | /* Signals caused by debugger's own actions should not be given to |
10502 | the program afterwards. | |
10503 | ||
10504 | Do not deliver GDB_SIGNAL_TRAP by default, except when the user | |
10505 | explicitly specifies that it should be delivered to the target | |
10506 | program. Typically, that would occur when a user is debugging a | |
10507 | target monitor on a simulator: the target monitor sets a | |
10508 | breakpoint; the simulator encounters this breakpoint and halts | |
10509 | the simulation handing control to GDB; GDB, noting that the stop | |
10510 | address doesn't map to any known breakpoint, returns control back | |
10511 | to the simulator; the simulator then delivers the hardware | |
10512 | equivalent of a GDB_SIGNAL_TRAP to the program being | |
10513 | debugged. */ | |
a493e3e2 PA |
10514 | signal_program[GDB_SIGNAL_TRAP] = 0; |
10515 | signal_program[GDB_SIGNAL_INT] = 0; | |
c906108c SS |
10516 | |
10517 | /* Signals that are not errors should not normally enter the debugger. */ | |
a493e3e2 PA |
10518 | signal_stop[GDB_SIGNAL_ALRM] = 0; |
10519 | signal_print[GDB_SIGNAL_ALRM] = 0; | |
10520 | signal_stop[GDB_SIGNAL_VTALRM] = 0; | |
10521 | signal_print[GDB_SIGNAL_VTALRM] = 0; | |
10522 | signal_stop[GDB_SIGNAL_PROF] = 0; | |
10523 | signal_print[GDB_SIGNAL_PROF] = 0; | |
10524 | signal_stop[GDB_SIGNAL_CHLD] = 0; | |
10525 | signal_print[GDB_SIGNAL_CHLD] = 0; | |
10526 | signal_stop[GDB_SIGNAL_IO] = 0; | |
10527 | signal_print[GDB_SIGNAL_IO] = 0; | |
10528 | signal_stop[GDB_SIGNAL_POLL] = 0; | |
10529 | signal_print[GDB_SIGNAL_POLL] = 0; | |
10530 | signal_stop[GDB_SIGNAL_URG] = 0; | |
10531 | signal_print[GDB_SIGNAL_URG] = 0; | |
10532 | signal_stop[GDB_SIGNAL_WINCH] = 0; | |
10533 | signal_print[GDB_SIGNAL_WINCH] = 0; | |
10534 | signal_stop[GDB_SIGNAL_PRIO] = 0; | |
10535 | signal_print[GDB_SIGNAL_PRIO] = 0; | |
c906108c | 10536 | |
cd0fc7c3 SS |
10537 | /* These signals are used internally by user-level thread |
10538 | implementations. (See signal(5) on Solaris.) Like the above | |
10539 | signals, a healthy program receives and handles them as part of | |
10540 | its normal operation. */ | |
a493e3e2 PA |
10541 | signal_stop[GDB_SIGNAL_LWP] = 0; |
10542 | signal_print[GDB_SIGNAL_LWP] = 0; | |
10543 | signal_stop[GDB_SIGNAL_WAITING] = 0; | |
10544 | signal_print[GDB_SIGNAL_WAITING] = 0; | |
10545 | signal_stop[GDB_SIGNAL_CANCEL] = 0; | |
10546 | signal_print[GDB_SIGNAL_CANCEL] = 0; | |
bc7b765a JB |
10547 | signal_stop[GDB_SIGNAL_LIBRT] = 0; |
10548 | signal_print[GDB_SIGNAL_LIBRT] = 0; | |
cd0fc7c3 | 10549 | |
2455069d UW |
10550 | /* Update cached state. */ |
10551 | signal_cache_update (-1); | |
10552 | ||
85c07804 AC |
10553 | add_setshow_zinteger_cmd ("stop-on-solib-events", class_support, |
10554 | &stop_on_solib_events, _("\ | |
10555 | Set stopping for shared library events."), _("\ | |
10556 | Show stopping for shared library events."), _("\ | |
c906108c SS |
10557 | If nonzero, gdb will give control to the user when the dynamic linker\n\ |
10558 | notifies gdb of shared library events. The most common event of interest\n\ | |
85c07804 | 10559 | to the user would be loading/unloading of a new library."), |
f9e14852 | 10560 | set_stop_on_solib_events, |
920d2a44 | 10561 | show_stop_on_solib_events, |
85c07804 | 10562 | &setlist, &showlist); |
c906108c | 10563 | |
7ab04401 AC |
10564 | add_setshow_enum_cmd ("follow-fork-mode", class_run, |
10565 | follow_fork_mode_kind_names, | |
10566 | &follow_fork_mode_string, _("\ | |
10567 | Set debugger response to a program call of fork or vfork."), _("\ | |
10568 | Show debugger response to a program call of fork or vfork."), _("\ | |
c906108c SS |
10569 | A fork or vfork creates a new process. follow-fork-mode can be:\n\ |
10570 | parent - the original process is debugged after a fork\n\ | |
10571 | child - the new process is debugged after a fork\n\ | |
ea1dd7bc | 10572 | The unfollowed process will continue to run.\n\ |
7ab04401 | 10573 | By default, the debugger will follow the parent process."), |
03acd4d8 | 10574 | nullptr, |
920d2a44 | 10575 | show_follow_fork_mode_string, |
7ab04401 AC |
10576 | &setlist, &showlist); |
10577 | ||
6c95b8df PA |
10578 | add_setshow_enum_cmd ("follow-exec-mode", class_run, |
10579 | follow_exec_mode_names, | |
10580 | &follow_exec_mode_string, _("\ | |
10581 | Set debugger response to a program call of exec."), _("\ | |
10582 | Show debugger response to a program call of exec."), _("\ | |
10583 | An exec call replaces the program image of a process.\n\ | |
10584 | \n\ | |
10585 | follow-exec-mode can be:\n\ | |
10586 | \n\ | |
cce7e648 | 10587 | new - the debugger creates a new inferior and rebinds the process\n\ |
6c95b8df PA |
10588 | to this new inferior. The program the process was running before\n\ |
10589 | the exec call can be restarted afterwards by restarting the original\n\ | |
10590 | inferior.\n\ | |
10591 | \n\ | |
10592 | same - the debugger keeps the process bound to the same inferior.\n\ | |
10593 | The new executable image replaces the previous executable loaded in\n\ | |
10594 | the inferior. Restarting the inferior after the exec call restarts\n\ | |
10595 | the executable the process was running after the exec call.\n\ | |
10596 | \n\ | |
10597 | By default, the debugger will use the same inferior."), | |
03acd4d8 | 10598 | nullptr, |
6c95b8df PA |
10599 | show_follow_exec_mode_string, |
10600 | &setlist, &showlist); | |
10601 | ||
7ab04401 AC |
10602 | add_setshow_enum_cmd ("scheduler-locking", class_run, |
10603 | scheduler_enums, &scheduler_mode, _("\ | |
10604 | Set mode for locking scheduler during execution."), _("\ | |
10605 | Show mode for locking scheduler during execution."), _("\ | |
f2665db5 MM |
10606 | off == no locking (threads may preempt at any time)\n\ |
10607 | on == full locking (no thread except the current thread may run)\n\ | |
dda83cd7 | 10608 | This applies to both normal execution and replay mode.\n\ |
f2665db5 | 10609 | step == scheduler locked during stepping commands (step, next, stepi, nexti).\n\ |
dda83cd7 SM |
10610 | In this mode, other threads may run during other commands.\n\ |
10611 | This applies to both normal execution and replay mode.\n\ | |
f2665db5 | 10612 | replay == scheduler locked in replay mode and unlocked during normal execution."), |
7ab04401 | 10613 | set_schedlock_func, /* traps on target vector */ |
920d2a44 | 10614 | show_scheduler_mode, |
7ab04401 | 10615 | &setlist, &showlist); |
5fbbeb29 | 10616 | |
d4db2f36 PA |
10617 | add_setshow_boolean_cmd ("schedule-multiple", class_run, &sched_multi, _("\ |
10618 | Set mode for resuming threads of all processes."), _("\ | |
10619 | Show mode for resuming threads of all processes."), _("\ | |
10620 | When on, execution commands (such as 'continue' or 'next') resume all\n\ | |
10621 | threads of all processes. When off (which is the default), execution\n\ | |
10622 | commands only resume the threads of the current process. The set of\n\ | |
10623 | threads that are resumed is further refined by the scheduler-locking\n\ | |
10624 | mode (see help set scheduler-locking)."), | |
03acd4d8 | 10625 | nullptr, |
d4db2f36 PA |
10626 | show_schedule_multiple, |
10627 | &setlist, &showlist); | |
10628 | ||
5bf193a2 AC |
10629 | add_setshow_boolean_cmd ("step-mode", class_run, &step_stop_if_no_debug, _("\ |
10630 | Set mode of the step operation."), _("\ | |
10631 | Show mode of the step operation."), _("\ | |
10632 | When set, doing a step over a function without debug line information\n\ | |
10633 | will stop at the first instruction of that function. Otherwise, the\n\ | |
10634 | function is skipped and the step command stops at a different source line."), | |
03acd4d8 | 10635 | nullptr, |
920d2a44 | 10636 | show_step_stop_if_no_debug, |
5bf193a2 | 10637 | &setlist, &showlist); |
ca6724c1 | 10638 | |
72d0e2c5 YQ |
10639 | add_setshow_auto_boolean_cmd ("displaced-stepping", class_run, |
10640 | &can_use_displaced_stepping, _("\ | |
237fc4c9 PA |
10641 | Set debugger's willingness to use displaced stepping."), _("\ |
10642 | Show debugger's willingness to use displaced stepping."), _("\ | |
fff08868 HZ |
10643 | If on, gdb will use displaced stepping to step over breakpoints if it is\n\ |
10644 | supported by the target architecture. If off, gdb will not use displaced\n\ | |
10645 | stepping to step over breakpoints, even if such is supported by the target\n\ | |
10646 | architecture. If auto (which is the default), gdb will use displaced stepping\n\ | |
10647 | if the target architecture supports it and non-stop mode is active, but will not\n\ | |
10648 | use it in all-stop mode (see help set non-stop)."), | |
03acd4d8 | 10649 | nullptr, |
72d0e2c5 YQ |
10650 | show_can_use_displaced_stepping, |
10651 | &setlist, &showlist); | |
237fc4c9 | 10652 | |
b2175913 MS |
10653 | add_setshow_enum_cmd ("exec-direction", class_run, exec_direction_names, |
10654 | &exec_direction, _("Set direction of execution.\n\ | |
10655 | Options are 'forward' or 'reverse'."), | |
10656 | _("Show direction of execution (forward/reverse)."), | |
10657 | _("Tells gdb whether to execute forward or backward."), | |
10658 | set_exec_direction_func, show_exec_direction_func, | |
10659 | &setlist, &showlist); | |
10660 | ||
6c95b8df PA |
10661 | /* Set/show detach-on-fork: user-settable mode. */ |
10662 | ||
10663 | add_setshow_boolean_cmd ("detach-on-fork", class_run, &detach_fork, _("\ | |
10664 | Set whether gdb will detach the child of a fork."), _("\ | |
10665 | Show whether gdb will detach the child of a fork."), _("\ | |
10666 | Tells gdb whether to detach the child of a fork."), | |
03acd4d8 | 10667 | nullptr, nullptr, &setlist, &showlist); |
6c95b8df | 10668 | |
03583c20 UW |
10669 | /* Set/show disable address space randomization mode. */ |
10670 | ||
10671 | add_setshow_boolean_cmd ("disable-randomization", class_support, | |
10672 | &disable_randomization, _("\ | |
10673 | Set disabling of debuggee's virtual address space randomization."), _("\ | |
10674 | Show disabling of debuggee's virtual address space randomization."), _("\ | |
10675 | When this mode is on (which is the default), randomization of the virtual\n\ | |
10676 | address space is disabled. Standalone programs run with the randomization\n\ | |
10677 | enabled by default on some platforms."), | |
10678 | &set_disable_randomization, | |
10679 | &show_disable_randomization, | |
10680 | &setlist, &showlist); | |
10681 | ||
ca6724c1 | 10682 | /* ptid initializations */ |
ca6724c1 KB |
10683 | inferior_ptid = null_ptid; |
10684 | target_last_wait_ptid = minus_one_ptid; | |
5231c1fd | 10685 | |
c90e7d63 SM |
10686 | gdb::observers::thread_ptid_changed.attach (infrun_thread_ptid_changed, |
10687 | "infrun"); | |
10688 | gdb::observers::thread_stop_requested.attach (infrun_thread_stop_requested, | |
10689 | "infrun"); | |
c90e7d63 SM |
10690 | gdb::observers::inferior_exit.attach (infrun_inferior_exit, "infrun"); |
10691 | gdb::observers::inferior_execd.attach (infrun_inferior_execd, "infrun"); | |
4aa995e1 PA |
10692 | |
10693 | /* Explicitly create without lookup, since that tries to create a | |
10694 | value with a void typed value, and when we get here, gdbarch | |
10695 | isn't initialized yet. At this point, we're quite sure there | |
10696 | isn't another convenience variable of the same name. */ | |
03acd4d8 | 10697 | create_internalvar_type_lazy ("_siginfo", &siginfo_funcs, nullptr); |
d914c394 SS |
10698 | |
10699 | add_setshow_boolean_cmd ("observer", no_class, | |
10700 | &observer_mode_1, _("\ | |
10701 | Set whether gdb controls the inferior in observer mode."), _("\ | |
10702 | Show whether gdb controls the inferior in observer mode."), _("\ | |
10703 | In observer mode, GDB can get data from the inferior, but not\n\ | |
10704 | affect its execution. Registers and memory may not be changed,\n\ | |
10705 | breakpoints may not be set, and the program cannot be interrupted\n\ | |
10706 | or signalled."), | |
10707 | set_observer_mode, | |
10708 | show_observer_mode, | |
10709 | &setlist, | |
10710 | &showlist); | |
b161a60d SM |
10711 | |
10712 | #if GDB_SELF_TEST | |
10713 | selftests::register_test ("infrun_thread_ptid_changed", | |
10714 | selftests::infrun_thread_ptid_changed); | |
10715 | #endif | |
c906108c | 10716 | } |