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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 | |
213516ef | 4 | Copyright (C) 1986-2023 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" |
2acceee2 | 37 | #include "inf-loop.h" |
4e052eda | 38 | #include "regcache.h" |
fd0407d6 | 39 | #include "value.h" |
76727919 | 40 | #include "observable.h" |
f636b87d | 41 | #include "language.h" |
a77053c2 | 42 | #include "solib.h" |
f17517ea | 43 | #include "main.h" |
186c406b | 44 | #include "block.h" |
034dad6f | 45 | #include "mi/mi-common.h" |
4f8d22e3 | 46 | #include "event-top.h" |
96429cc8 | 47 | #include "record.h" |
d02ed0bb | 48 | #include "record-full.h" |
edb3359d | 49 | #include "inline-frame.h" |
4efc6507 | 50 | #include "jit.h" |
06cd862c | 51 | #include "tracepoint.h" |
1bfeeb0f | 52 | #include "skip.h" |
28106bc2 SDJ |
53 | #include "probe.h" |
54 | #include "objfiles.h" | |
de0bea00 | 55 | #include "completer.h" |
9107fc8d | 56 | #include "target-descriptions.h" |
f15cb84a | 57 | #include "target-dcache.h" |
d83ad864 | 58 | #include "terminal.h" |
ff862be4 | 59 | #include "solist.h" |
400b5eca | 60 | #include "gdbsupport/event-loop.h" |
243a9253 | 61 | #include "thread-fsm.h" |
268a13a5 | 62 | #include "gdbsupport/enum-flags.h" |
5ed8105e | 63 | #include "progspace-and-thread.h" |
268a13a5 | 64 | #include "gdbsupport/gdb_optional.h" |
46a62268 | 65 | #include "arch-utils.h" |
268a13a5 TT |
66 | #include "gdbsupport/scope-exit.h" |
67 | #include "gdbsupport/forward-scope-exit.h" | |
06cc9596 | 68 | #include "gdbsupport/gdb_select.h" |
5b6d1e4f | 69 | #include <unordered_map> |
93b54c8e | 70 | #include "async-event.h" |
b161a60d SM |
71 | #include "gdbsupport/selftest.h" |
72 | #include "scoped-mock-context.h" | |
73 | #include "test-target.h" | |
ba988419 | 74 | #include "gdbsupport/common-debug.h" |
7904e961 | 75 | #include "gdbsupport/buildargv.h" |
c906108c SS |
76 | |
77 | /* Prototypes for local functions */ | |
78 | ||
2ea28649 | 79 | static void sig_print_info (enum gdb_signal); |
c906108c | 80 | |
96baa820 | 81 | static void sig_print_header (void); |
c906108c | 82 | |
d83ad864 DB |
83 | static void follow_inferior_reset_breakpoints (void); |
84 | ||
c4464ade | 85 | static bool currently_stepping (struct thread_info *tp); |
a289b8f6 | 86 | |
9efe17a3 | 87 | static void insert_hp_step_resume_breakpoint_at_frame (frame_info_ptr); |
2484c66b | 88 | |
9efe17a3 | 89 | static void insert_step_resume_breakpoint_at_caller (frame_info_ptr); |
2484c66b | 90 | |
2484c66b UW |
91 | static void insert_longjmp_resume_breakpoint (struct gdbarch *, CORE_ADDR); |
92 | ||
22b11ba9 | 93 | static bool maybe_software_singlestep (struct gdbarch *gdbarch); |
8550d3b3 | 94 | |
aff4e175 AB |
95 | static void resume (gdb_signal sig); |
96 | ||
5b6d1e4f PA |
97 | static void wait_for_inferior (inferior *inf); |
98 | ||
d8bbae6e SM |
99 | static void restart_threads (struct thread_info *event_thread, |
100 | inferior *inf = nullptr); | |
101 | ||
102 | static bool start_step_over (void); | |
103 | ||
2b718529 LS |
104 | static bool step_over_info_valid_p (void); |
105 | ||
372316f1 PA |
106 | /* Asynchronous signal handler registered as event loop source for |
107 | when we have pending events ready to be passed to the core. */ | |
108 | static struct async_event_handler *infrun_async_inferior_event_token; | |
109 | ||
110 | /* Stores whether infrun_async was previously enabled or disabled. | |
111 | Starts off as -1, indicating "never enabled/disabled". */ | |
112 | static int infrun_is_async = -1; | |
113 | ||
114 | /* See infrun.h. */ | |
115 | ||
116 | void | |
117 | infrun_async (int enable) | |
118 | { | |
119 | if (infrun_is_async != enable) | |
120 | { | |
121 | infrun_is_async = enable; | |
122 | ||
1eb8556f | 123 | infrun_debug_printf ("enable=%d", enable); |
372316f1 PA |
124 | |
125 | if (enable) | |
126 | mark_async_event_handler (infrun_async_inferior_event_token); | |
127 | else | |
128 | clear_async_event_handler (infrun_async_inferior_event_token); | |
129 | } | |
130 | } | |
131 | ||
0b333c5e PA |
132 | /* See infrun.h. */ |
133 | ||
134 | void | |
135 | mark_infrun_async_event_handler (void) | |
136 | { | |
137 | mark_async_event_handler (infrun_async_inferior_event_token); | |
138 | } | |
139 | ||
5fbbeb29 CF |
140 | /* When set, stop the 'step' command if we enter a function which has |
141 | no line number information. The normal behavior is that we step | |
142 | over such function. */ | |
491144b5 | 143 | bool step_stop_if_no_debug = false; |
920d2a44 AC |
144 | static void |
145 | show_step_stop_if_no_debug (struct ui_file *file, int from_tty, | |
146 | struct cmd_list_element *c, const char *value) | |
147 | { | |
6cb06a8c | 148 | gdb_printf (file, _("Mode of the step operation is %s.\n"), value); |
920d2a44 | 149 | } |
5fbbeb29 | 150 | |
b9f437de PA |
151 | /* proceed and normal_stop use this to notify the user when the |
152 | inferior stopped in a different thread than it had been running | |
153 | in. */ | |
96baa820 | 154 | |
39f77062 | 155 | static ptid_t previous_inferior_ptid; |
7a292a7a | 156 | |
07107ca6 LM |
157 | /* If set (default for legacy reasons), when following a fork, GDB |
158 | will detach from one of the fork branches, child or parent. | |
159 | Exactly which branch is detached depends on 'set follow-fork-mode' | |
160 | setting. */ | |
161 | ||
491144b5 | 162 | static bool detach_fork = true; |
6c95b8df | 163 | |
94ba44a6 | 164 | bool debug_infrun = false; |
920d2a44 AC |
165 | static void |
166 | show_debug_infrun (struct ui_file *file, int from_tty, | |
167 | struct cmd_list_element *c, const char *value) | |
168 | { | |
6cb06a8c | 169 | gdb_printf (file, _("Inferior debugging is %s.\n"), value); |
920d2a44 | 170 | } |
527159b7 | 171 | |
03583c20 UW |
172 | /* Support for disabling address space randomization. */ |
173 | ||
491144b5 | 174 | bool disable_randomization = true; |
03583c20 UW |
175 | |
176 | static void | |
177 | show_disable_randomization (struct ui_file *file, int from_tty, | |
178 | struct cmd_list_element *c, const char *value) | |
179 | { | |
180 | if (target_supports_disable_randomization ()) | |
6cb06a8c TT |
181 | gdb_printf (file, |
182 | _("Disabling randomization of debuggee's " | |
183 | "virtual address space is %s.\n"), | |
184 | value); | |
03583c20 | 185 | else |
0426ad51 TT |
186 | gdb_puts (_("Disabling randomization of debuggee's " |
187 | "virtual address space is unsupported on\n" | |
188 | "this platform.\n"), file); | |
03583c20 UW |
189 | } |
190 | ||
191 | static void | |
eb4c3f4a | 192 | set_disable_randomization (const char *args, int from_tty, |
03583c20 UW |
193 | struct cmd_list_element *c) |
194 | { | |
195 | if (!target_supports_disable_randomization ()) | |
196 | error (_("Disabling randomization of debuggee's " | |
197 | "virtual address space is unsupported on\n" | |
198 | "this platform.")); | |
199 | } | |
200 | ||
d32dc48e PA |
201 | /* User interface for non-stop mode. */ |
202 | ||
491144b5 CB |
203 | bool non_stop = false; |
204 | static bool non_stop_1 = false; | |
d32dc48e PA |
205 | |
206 | static void | |
eb4c3f4a | 207 | set_non_stop (const char *args, int from_tty, |
d32dc48e PA |
208 | struct cmd_list_element *c) |
209 | { | |
55f6301a | 210 | if (target_has_execution ()) |
d32dc48e PA |
211 | { |
212 | non_stop_1 = non_stop; | |
213 | error (_("Cannot change this setting while the inferior is running.")); | |
214 | } | |
215 | ||
216 | non_stop = non_stop_1; | |
217 | } | |
218 | ||
219 | static void | |
220 | show_non_stop (struct ui_file *file, int from_tty, | |
221 | struct cmd_list_element *c, const char *value) | |
222 | { | |
6cb06a8c TT |
223 | gdb_printf (file, |
224 | _("Controlling the inferior in non-stop mode is %s.\n"), | |
225 | value); | |
d32dc48e PA |
226 | } |
227 | ||
d914c394 SS |
228 | /* "Observer mode" is somewhat like a more extreme version of |
229 | non-stop, in which all GDB operations that might affect the | |
230 | target's execution have been disabled. */ | |
231 | ||
6bd434d6 | 232 | static bool observer_mode = false; |
491144b5 | 233 | static bool observer_mode_1 = false; |
d914c394 SS |
234 | |
235 | static void | |
eb4c3f4a | 236 | set_observer_mode (const char *args, int from_tty, |
d914c394 SS |
237 | struct cmd_list_element *c) |
238 | { | |
55f6301a | 239 | if (target_has_execution ()) |
d914c394 SS |
240 | { |
241 | observer_mode_1 = observer_mode; | |
242 | error (_("Cannot change this setting while the inferior is running.")); | |
243 | } | |
244 | ||
245 | observer_mode = observer_mode_1; | |
246 | ||
247 | may_write_registers = !observer_mode; | |
248 | may_write_memory = !observer_mode; | |
249 | may_insert_breakpoints = !observer_mode; | |
250 | may_insert_tracepoints = !observer_mode; | |
251 | /* We can insert fast tracepoints in or out of observer mode, | |
252 | but enable them if we're going into this mode. */ | |
253 | if (observer_mode) | |
491144b5 | 254 | may_insert_fast_tracepoints = true; |
d914c394 SS |
255 | may_stop = !observer_mode; |
256 | update_target_permissions (); | |
257 | ||
258 | /* Going *into* observer mode we must force non-stop, then | |
259 | going out we leave it that way. */ | |
260 | if (observer_mode) | |
261 | { | |
2f6831b8 | 262 | pagination_enabled = false; |
491144b5 | 263 | non_stop = non_stop_1 = true; |
d914c394 SS |
264 | } |
265 | ||
266 | if (from_tty) | |
6cb06a8c TT |
267 | gdb_printf (_("Observer mode is now %s.\n"), |
268 | (observer_mode ? "on" : "off")); | |
d914c394 SS |
269 | } |
270 | ||
271 | static void | |
272 | show_observer_mode (struct ui_file *file, int from_tty, | |
273 | struct cmd_list_element *c, const char *value) | |
274 | { | |
6cb06a8c | 275 | gdb_printf (file, _("Observer mode is %s.\n"), value); |
d914c394 SS |
276 | } |
277 | ||
278 | /* This updates the value of observer mode based on changes in | |
279 | permissions. Note that we are deliberately ignoring the values of | |
280 | may-write-registers and may-write-memory, since the user may have | |
281 | reason to enable these during a session, for instance to turn on a | |
282 | debugging-related global. */ | |
283 | ||
284 | void | |
285 | update_observer_mode (void) | |
286 | { | |
491144b5 CB |
287 | bool newval = (!may_insert_breakpoints |
288 | && !may_insert_tracepoints | |
289 | && may_insert_fast_tracepoints | |
290 | && !may_stop | |
291 | && non_stop); | |
d914c394 SS |
292 | |
293 | /* Let the user know if things change. */ | |
294 | if (newval != observer_mode) | |
6cb06a8c TT |
295 | gdb_printf (_("Observer mode is now %s.\n"), |
296 | (newval ? "on" : "off")); | |
d914c394 SS |
297 | |
298 | observer_mode = observer_mode_1 = newval; | |
299 | } | |
c2c6d25f | 300 | |
c906108c SS |
301 | /* Tables of how to react to signals; the user sets them. */ |
302 | ||
adc6a863 PA |
303 | static unsigned char signal_stop[GDB_SIGNAL_LAST]; |
304 | static unsigned char signal_print[GDB_SIGNAL_LAST]; | |
305 | static unsigned char signal_program[GDB_SIGNAL_LAST]; | |
c906108c | 306 | |
ab04a2af TT |
307 | /* Table of signals that are registered with "catch signal". A |
308 | non-zero entry indicates that the signal is caught by some "catch | |
adc6a863 PA |
309 | signal" command. */ |
310 | static unsigned char signal_catch[GDB_SIGNAL_LAST]; | |
ab04a2af | 311 | |
2455069d UW |
312 | /* Table of signals that the target may silently handle. |
313 | This is automatically determined from the flags above, | |
314 | and simply cached here. */ | |
adc6a863 | 315 | static unsigned char signal_pass[GDB_SIGNAL_LAST]; |
2455069d | 316 | |
c906108c SS |
317 | #define SET_SIGS(nsigs,sigs,flags) \ |
318 | do { \ | |
319 | int signum = (nsigs); \ | |
320 | while (signum-- > 0) \ | |
321 | if ((sigs)[signum]) \ | |
322 | (flags)[signum] = 1; \ | |
323 | } while (0) | |
324 | ||
325 | #define UNSET_SIGS(nsigs,sigs,flags) \ | |
326 | do { \ | |
327 | int signum = (nsigs); \ | |
328 | while (signum-- > 0) \ | |
329 | if ((sigs)[signum]) \ | |
330 | (flags)[signum] = 0; \ | |
331 | } while (0) | |
332 | ||
9b224c5e PA |
333 | /* Update the target's copy of SIGNAL_PROGRAM. The sole purpose of |
334 | this function is to avoid exporting `signal_program'. */ | |
335 | ||
336 | void | |
337 | update_signals_program_target (void) | |
338 | { | |
adc6a863 | 339 | target_program_signals (signal_program); |
9b224c5e PA |
340 | } |
341 | ||
1777feb0 | 342 | /* Value to pass to target_resume() to cause all threads to resume. */ |
39f77062 | 343 | |
edb3359d | 344 | #define RESUME_ALL minus_one_ptid |
c906108c SS |
345 | |
346 | /* Command list pointer for the "stop" placeholder. */ | |
347 | ||
348 | static struct cmd_list_element *stop_command; | |
349 | ||
c906108c SS |
350 | /* Nonzero if we want to give control to the user when we're notified |
351 | of shared library events by the dynamic linker. */ | |
628fe4e4 | 352 | int stop_on_solib_events; |
f9e14852 GB |
353 | |
354 | /* Enable or disable optional shared library event breakpoints | |
355 | as appropriate when the above flag is changed. */ | |
356 | ||
357 | static void | |
eb4c3f4a TT |
358 | set_stop_on_solib_events (const char *args, |
359 | int from_tty, struct cmd_list_element *c) | |
f9e14852 GB |
360 | { |
361 | update_solib_breakpoints (); | |
362 | } | |
363 | ||
920d2a44 AC |
364 | static void |
365 | show_stop_on_solib_events (struct ui_file *file, int from_tty, | |
366 | struct cmd_list_element *c, const char *value) | |
367 | { | |
6cb06a8c TT |
368 | gdb_printf (file, _("Stopping for shared library events is %s.\n"), |
369 | value); | |
920d2a44 | 370 | } |
c906108c | 371 | |
c4464ade | 372 | /* True after stop if current stack frame should be printed. */ |
c906108c | 373 | |
c4464ade | 374 | static bool stop_print_frame; |
c906108c | 375 | |
5b6d1e4f | 376 | /* This is a cached copy of the target/ptid/waitstatus of the last |
fb85cece | 377 | event returned by target_wait(). |
5b6d1e4f PA |
378 | This information is returned by get_last_target_status(). */ |
379 | static process_stratum_target *target_last_proc_target; | |
39f77062 | 380 | static ptid_t target_last_wait_ptid; |
e02bc4cc DS |
381 | static struct target_waitstatus target_last_waitstatus; |
382 | ||
4e1c45ea | 383 | void init_thread_stepping_state (struct thread_info *tss); |
0d1e5fa7 | 384 | |
53904c9e AC |
385 | static const char follow_fork_mode_child[] = "child"; |
386 | static const char follow_fork_mode_parent[] = "parent"; | |
387 | ||
40478521 | 388 | static const char *const follow_fork_mode_kind_names[] = { |
53904c9e AC |
389 | follow_fork_mode_child, |
390 | follow_fork_mode_parent, | |
03acd4d8 | 391 | nullptr |
ef346e04 | 392 | }; |
c906108c | 393 | |
53904c9e | 394 | static const char *follow_fork_mode_string = follow_fork_mode_parent; |
920d2a44 AC |
395 | static void |
396 | show_follow_fork_mode_string (struct ui_file *file, int from_tty, | |
397 | struct cmd_list_element *c, const char *value) | |
398 | { | |
6cb06a8c TT |
399 | gdb_printf (file, |
400 | _("Debugger response to a program " | |
401 | "call of fork or vfork is \"%s\".\n"), | |
402 | value); | |
920d2a44 | 403 | } |
c906108c SS |
404 | \f |
405 | ||
d83ad864 DB |
406 | /* Handle changes to the inferior list based on the type of fork, |
407 | which process is being followed, and whether the other process | |
408 | should be detached. On entry inferior_ptid must be the ptid of | |
409 | the fork parent. At return inferior_ptid is the ptid of the | |
410 | followed inferior. */ | |
411 | ||
5ab2fbf1 SM |
412 | static bool |
413 | follow_fork_inferior (bool follow_child, bool detach_fork) | |
d83ad864 | 414 | { |
183be222 | 415 | target_waitkind fork_kind = inferior_thread ()->pending_follow.kind (); |
3a849a34 SM |
416 | gdb_assert (fork_kind == TARGET_WAITKIND_FORKED |
417 | || fork_kind == TARGET_WAITKIND_VFORKED); | |
418 | bool has_vforked = fork_kind == TARGET_WAITKIND_VFORKED; | |
419 | ptid_t parent_ptid = inferior_ptid; | |
183be222 | 420 | ptid_t child_ptid = inferior_thread ()->pending_follow.child_ptid (); |
d83ad864 DB |
421 | |
422 | if (has_vforked | |
423 | && !non_stop /* Non-stop always resumes both branches. */ | |
3b12939d | 424 | && current_ui->prompt_state == PROMPT_BLOCKED |
d83ad864 DB |
425 | && !(follow_child || detach_fork || sched_multi)) |
426 | { | |
427 | /* The parent stays blocked inside the vfork syscall until the | |
428 | child execs or exits. If we don't let the child run, then | |
429 | the parent stays blocked. If we're telling the parent to run | |
430 | in the foreground, the user will not be able to ctrl-c to get | |
431 | back the terminal, effectively hanging the debug session. */ | |
6cb06a8c | 432 | gdb_printf (gdb_stderr, _("\ |
d83ad864 DB |
433 | Can not resume the parent process over vfork in the foreground while\n\ |
434 | holding the child stopped. Try \"set detach-on-fork\" or \ | |
435 | \"set schedule-multiple\".\n")); | |
e97007b6 | 436 | return true; |
d83ad864 DB |
437 | } |
438 | ||
82d1f134 SM |
439 | inferior *parent_inf = current_inferior (); |
440 | inferior *child_inf = nullptr; | |
ff770835 | 441 | |
d8bbae6e SM |
442 | gdb_assert (parent_inf->thread_waiting_for_vfork_done == nullptr); |
443 | ||
d83ad864 DB |
444 | if (!follow_child) |
445 | { | |
446 | /* Detach new forked process? */ | |
447 | if (detach_fork) | |
448 | { | |
d83ad864 DB |
449 | /* Before detaching from the child, remove all breakpoints |
450 | from it. If we forked, then this has already been taken | |
451 | care of by infrun.c. If we vforked however, any | |
452 | breakpoint inserted in the parent is visible in the | |
453 | child, even those added while stopped in a vfork | |
454 | catchpoint. This will remove the breakpoints from the | |
455 | parent also, but they'll be reinserted below. */ | |
456 | if (has_vforked) | |
457 | { | |
458 | /* Keep breakpoints list in sync. */ | |
00431a78 | 459 | remove_breakpoints_inf (current_inferior ()); |
d83ad864 DB |
460 | } |
461 | ||
f67c0c91 | 462 | if (print_inferior_events) |
d83ad864 | 463 | { |
8dd06f7a | 464 | /* Ensure that we have a process ptid. */ |
e99b03dc | 465 | ptid_t process_ptid = ptid_t (child_ptid.pid ()); |
8dd06f7a | 466 | |
223ffa71 | 467 | target_terminal::ours_for_output (); |
6cb06a8c TT |
468 | gdb_printf (_("[Detaching after %s from child %s]\n"), |
469 | has_vforked ? "vfork" : "fork", | |
470 | target_pid_to_str (process_ptid).c_str ()); | |
d83ad864 DB |
471 | } |
472 | } | |
473 | else | |
474 | { | |
d83ad864 | 475 | /* Add process to GDB's tables. */ |
e99b03dc | 476 | child_inf = add_inferior (child_ptid.pid ()); |
d83ad864 | 477 | |
d83ad864 DB |
478 | child_inf->attach_flag = parent_inf->attach_flag; |
479 | copy_terminal_info (child_inf, parent_inf); | |
480 | child_inf->gdbarch = parent_inf->gdbarch; | |
57768366 | 481 | child_inf->tdesc_info = parent_inf->tdesc_info; |
d83ad864 | 482 | |
d83ad864 DB |
483 | child_inf->symfile_flags = SYMFILE_NO_READ; |
484 | ||
485 | /* If this is a vfork child, then the address-space is | |
486 | shared with the parent. */ | |
487 | if (has_vforked) | |
488 | { | |
489 | child_inf->pspace = parent_inf->pspace; | |
490 | child_inf->aspace = parent_inf->aspace; | |
491 | ||
82d1f134 | 492 | exec_on_vfork (child_inf); |
5b6d1e4f | 493 | |
d83ad864 DB |
494 | /* The parent will be frozen until the child is done |
495 | with the shared region. Keep track of the | |
496 | parent. */ | |
497 | child_inf->vfork_parent = parent_inf; | |
30220b46 | 498 | child_inf->pending_detach = false; |
d83ad864 | 499 | parent_inf->vfork_child = child_inf; |
30220b46 | 500 | parent_inf->pending_detach = false; |
d83ad864 DB |
501 | } |
502 | else | |
503 | { | |
b382c166 | 504 | child_inf->aspace = new address_space (); |
564b1e3f | 505 | child_inf->pspace = new program_space (child_inf->aspace); |
30220b46 | 506 | child_inf->removable = true; |
d83ad864 | 507 | clone_program_space (child_inf->pspace, parent_inf->pspace); |
d83ad864 | 508 | } |
d83ad864 DB |
509 | } |
510 | ||
511 | if (has_vforked) | |
512 | { | |
d83ad864 DB |
513 | /* If we detached from the child, then we have to be careful |
514 | to not insert breakpoints in the parent until the child | |
515 | is done with the shared memory region. However, if we're | |
516 | staying attached to the child, then we can and should | |
517 | insert breakpoints, so that we can debug it. A | |
518 | subsequent child exec or exit is enough to know when does | |
519 | the child stops using the parent's address space. */ | |
6f5d514f SM |
520 | parent_inf->thread_waiting_for_vfork_done |
521 | = detach_fork ? inferior_thread () : nullptr; | |
d83ad864 DB |
522 | parent_inf->pspace->breakpoints_not_allowed = detach_fork; |
523 | } | |
524 | } | |
525 | else | |
526 | { | |
527 | /* Follow the child. */ | |
d83ad864 | 528 | |
f67c0c91 | 529 | if (print_inferior_events) |
d83ad864 | 530 | { |
f67c0c91 SDJ |
531 | std::string parent_pid = target_pid_to_str (parent_ptid); |
532 | std::string child_pid = target_pid_to_str (child_ptid); | |
533 | ||
223ffa71 | 534 | target_terminal::ours_for_output (); |
6cb06a8c TT |
535 | gdb_printf (_("[Attaching after %s %s to child %s]\n"), |
536 | parent_pid.c_str (), | |
537 | has_vforked ? "vfork" : "fork", | |
538 | child_pid.c_str ()); | |
d83ad864 DB |
539 | } |
540 | ||
541 | /* Add the new inferior first, so that the target_detach below | |
542 | doesn't unpush the target. */ | |
543 | ||
e99b03dc | 544 | child_inf = add_inferior (child_ptid.pid ()); |
d83ad864 | 545 | |
d83ad864 DB |
546 | child_inf->attach_flag = parent_inf->attach_flag; |
547 | copy_terminal_info (child_inf, parent_inf); | |
548 | child_inf->gdbarch = parent_inf->gdbarch; | |
57768366 | 549 | child_inf->tdesc_info = parent_inf->tdesc_info; |
d83ad864 | 550 | |
da474da1 | 551 | if (has_vforked) |
d83ad864 | 552 | { |
da474da1 SM |
553 | /* If this is a vfork child, then the address-space is shared |
554 | with the parent. */ | |
555 | child_inf->aspace = parent_inf->aspace; | |
556 | child_inf->pspace = parent_inf->pspace; | |
5b6d1e4f | 557 | |
82d1f134 | 558 | exec_on_vfork (child_inf); |
d83ad864 | 559 | } |
da474da1 SM |
560 | else if (detach_fork) |
561 | { | |
562 | /* We follow the child and detach from the parent: move the parent's | |
563 | program space to the child. This simplifies some things, like | |
564 | doing "next" over fork() and landing on the expected line in the | |
565 | child (note, that is broken with "set detach-on-fork off"). | |
566 | ||
567 | Before assigning brand new spaces for the parent, remove | |
568 | breakpoints from it: because the new pspace won't match | |
569 | currently inserted locations, the normal detach procedure | |
570 | wouldn't remove them, and we would leave them inserted when | |
571 | detaching. */ | |
572 | remove_breakpoints_inf (parent_inf); | |
573 | ||
574 | child_inf->aspace = parent_inf->aspace; | |
575 | child_inf->pspace = parent_inf->pspace; | |
b382c166 | 576 | parent_inf->aspace = new address_space (); |
da474da1 SM |
577 | parent_inf->pspace = new program_space (parent_inf->aspace); |
578 | clone_program_space (parent_inf->pspace, child_inf->pspace); | |
579 | ||
580 | /* The parent inferior is still the current one, so keep things | |
581 | in sync. */ | |
582 | set_current_program_space (parent_inf->pspace); | |
583 | } | |
d83ad864 DB |
584 | else |
585 | { | |
b382c166 | 586 | child_inf->aspace = new address_space (); |
564b1e3f | 587 | child_inf->pspace = new program_space (child_inf->aspace); |
30220b46 | 588 | child_inf->removable = true; |
d83ad864 | 589 | child_inf->symfile_flags = SYMFILE_NO_READ; |
da474da1 | 590 | clone_program_space (child_inf->pspace, parent_inf->pspace); |
d83ad864 DB |
591 | } |
592 | } | |
593 | ||
82d1f134 SM |
594 | gdb_assert (current_inferior () == parent_inf); |
595 | ||
596 | /* If we are setting up an inferior for the child, target_follow_fork is | |
597 | responsible for pushing the appropriate targets on the new inferior's | |
598 | target stack and adding the initial thread (with ptid CHILD_PTID). | |
599 | ||
600 | If we are not setting up an inferior for the child (because following | |
601 | the parent and detach_fork is true), it is responsible for detaching | |
602 | from CHILD_PTID. */ | |
603 | target_follow_fork (child_inf, child_ptid, fork_kind, follow_child, | |
604 | detach_fork); | |
605 | ||
606 | /* target_follow_fork must leave the parent as the current inferior. If we | |
607 | want to follow the child, we make it the current one below. */ | |
608 | gdb_assert (current_inferior () == parent_inf); | |
609 | ||
610 | /* If there is a child inferior, target_follow_fork must have created a thread | |
611 | for it. */ | |
612 | if (child_inf != nullptr) | |
613 | gdb_assert (!child_inf->thread_list.empty ()); | |
614 | ||
577d2167 SM |
615 | /* Clear the parent thread's pending follow field. Do this before calling |
616 | target_detach, so that the target can differentiate the two following | |
617 | cases: | |
618 | ||
619 | - We continue past a fork with "follow-fork-mode == child" && | |
620 | "detach-on-fork on", and therefore detach the parent. In that | |
621 | case the target should not detach the fork child. | |
622 | - We run to a fork catchpoint and the user types "detach". In that | |
623 | case, the target should detach the fork child in addition to the | |
624 | parent. | |
625 | ||
626 | The former case will have pending_follow cleared, the later will have | |
627 | pending_follow set. */ | |
628 | thread_info *parent_thread = find_thread_ptid (parent_inf, parent_ptid); | |
629 | gdb_assert (parent_thread != nullptr); | |
630 | parent_thread->pending_follow.set_spurious (); | |
631 | ||
82d1f134 SM |
632 | /* Detach the parent if needed. */ |
633 | if (follow_child) | |
634 | { | |
635 | /* If we're vforking, we want to hold on to the parent until | |
636 | the child exits or execs. At child exec or exit time we | |
637 | can remove the old breakpoints from the parent and detach | |
638 | or resume debugging it. Otherwise, detach the parent now; | |
639 | we'll want to reuse it's program/address spaces, but we | |
640 | can't set them to the child before removing breakpoints | |
641 | from the parent, otherwise, the breakpoints module could | |
642 | decide to remove breakpoints from the wrong process (since | |
643 | they'd be assigned to the same address space). */ | |
644 | ||
645 | if (has_vforked) | |
646 | { | |
03acd4d8 CL |
647 | gdb_assert (child_inf->vfork_parent == nullptr); |
648 | gdb_assert (parent_inf->vfork_child == nullptr); | |
82d1f134 | 649 | child_inf->vfork_parent = parent_inf; |
30220b46 | 650 | child_inf->pending_detach = false; |
82d1f134 SM |
651 | parent_inf->vfork_child = child_inf; |
652 | parent_inf->pending_detach = detach_fork; | |
82d1f134 SM |
653 | } |
654 | else if (detach_fork) | |
655 | { | |
656 | if (print_inferior_events) | |
657 | { | |
658 | /* Ensure that we have a process ptid. */ | |
659 | ptid_t process_ptid = ptid_t (parent_ptid.pid ()); | |
660 | ||
661 | target_terminal::ours_for_output (); | |
6cb06a8c TT |
662 | gdb_printf (_("[Detaching after fork from " |
663 | "parent %s]\n"), | |
664 | target_pid_to_str (process_ptid).c_str ()); | |
82d1f134 SM |
665 | } |
666 | ||
667 | target_detach (parent_inf, 0); | |
668 | } | |
669 | } | |
e97007b6 | 670 | |
ff770835 SM |
671 | /* If we ended up creating a new inferior, call post_create_inferior to inform |
672 | the various subcomponents. */ | |
82d1f134 | 673 | if (child_inf != nullptr) |
ff770835 | 674 | { |
82d1f134 SM |
675 | /* If FOLLOW_CHILD, we leave CHILD_INF as the current inferior |
676 | (do not restore the parent as the current inferior). */ | |
677 | gdb::optional<scoped_restore_current_thread> maybe_restore; | |
678 | ||
679 | if (!follow_child) | |
680 | maybe_restore.emplace (); | |
ff770835 | 681 | |
82d1f134 | 682 | switch_to_thread (*child_inf->threads ().begin ()); |
ff770835 SM |
683 | post_create_inferior (0); |
684 | } | |
685 | ||
e97007b6 | 686 | return false; |
d83ad864 DB |
687 | } |
688 | ||
e58b0e63 PA |
689 | /* Tell the target to follow the fork we're stopped at. Returns true |
690 | if the inferior should be resumed; false, if the target for some | |
691 | reason decided it's best not to resume. */ | |
692 | ||
5ab2fbf1 SM |
693 | static bool |
694 | follow_fork () | |
c906108c | 695 | { |
5ab2fbf1 SM |
696 | bool follow_child = (follow_fork_mode_string == follow_fork_mode_child); |
697 | bool should_resume = true; | |
e58b0e63 PA |
698 | |
699 | /* Copy user stepping state to the new inferior thread. FIXME: the | |
700 | followed fork child thread should have a copy of most of the | |
4e3990f4 DE |
701 | parent thread structure's run control related fields, not just these. |
702 | Initialized to avoid "may be used uninitialized" warnings from gcc. */ | |
03acd4d8 CL |
703 | struct breakpoint *step_resume_breakpoint = nullptr; |
704 | struct breakpoint *exception_resume_breakpoint = nullptr; | |
4e3990f4 DE |
705 | CORE_ADDR step_range_start = 0; |
706 | CORE_ADDR step_range_end = 0; | |
bf4cb9be | 707 | int current_line = 0; |
03acd4d8 | 708 | symtab *current_symtab = nullptr; |
4e3990f4 | 709 | struct frame_id step_frame_id = { 0 }; |
e58b0e63 PA |
710 | |
711 | if (!non_stop) | |
712 | { | |
5b6d1e4f | 713 | process_stratum_target *wait_target; |
e58b0e63 PA |
714 | ptid_t wait_ptid; |
715 | struct target_waitstatus wait_status; | |
716 | ||
717 | /* Get the last target status returned by target_wait(). */ | |
5b6d1e4f | 718 | get_last_target_status (&wait_target, &wait_ptid, &wait_status); |
e58b0e63 PA |
719 | |
720 | /* If not stopped at a fork event, then there's nothing else to | |
721 | do. */ | |
183be222 SM |
722 | if (wait_status.kind () != TARGET_WAITKIND_FORKED |
723 | && wait_status.kind () != TARGET_WAITKIND_VFORKED) | |
e58b0e63 PA |
724 | return 1; |
725 | ||
726 | /* Check if we switched over from WAIT_PTID, since the event was | |
727 | reported. */ | |
00431a78 | 728 | if (wait_ptid != minus_one_ptid |
5b6d1e4f PA |
729 | && (current_inferior ()->process_target () != wait_target |
730 | || inferior_ptid != wait_ptid)) | |
e58b0e63 PA |
731 | { |
732 | /* We did. Switch back to WAIT_PTID thread, to tell the | |
733 | target to follow it (in either direction). We'll | |
734 | afterwards refuse to resume, and inform the user what | |
735 | happened. */ | |
5b6d1e4f | 736 | thread_info *wait_thread = find_thread_ptid (wait_target, wait_ptid); |
00431a78 | 737 | switch_to_thread (wait_thread); |
5ab2fbf1 | 738 | should_resume = false; |
e58b0e63 PA |
739 | } |
740 | } | |
741 | ||
577d2167 | 742 | thread_info *tp = inferior_thread (); |
e58b0e63 PA |
743 | |
744 | /* If there were any forks/vforks that were caught and are now to be | |
745 | followed, then do so now. */ | |
183be222 | 746 | switch (tp->pending_follow.kind ()) |
e58b0e63 PA |
747 | { |
748 | case TARGET_WAITKIND_FORKED: | |
749 | case TARGET_WAITKIND_VFORKED: | |
750 | { | |
751 | ptid_t parent, child; | |
573269a8 | 752 | std::unique_ptr<struct thread_fsm> thread_fsm; |
e58b0e63 PA |
753 | |
754 | /* If the user did a next/step, etc, over a fork call, | |
755 | preserve the stepping state in the fork child. */ | |
756 | if (follow_child && should_resume) | |
757 | { | |
8358c15c JK |
758 | step_resume_breakpoint = clone_momentary_breakpoint |
759 | (tp->control.step_resume_breakpoint); | |
16c381f0 JK |
760 | step_range_start = tp->control.step_range_start; |
761 | step_range_end = tp->control.step_range_end; | |
bf4cb9be TV |
762 | current_line = tp->current_line; |
763 | current_symtab = tp->current_symtab; | |
16c381f0 | 764 | step_frame_id = tp->control.step_frame_id; |
186c406b TT |
765 | exception_resume_breakpoint |
766 | = clone_momentary_breakpoint (tp->control.exception_resume_breakpoint); | |
573269a8 | 767 | thread_fsm = tp->release_thread_fsm (); |
e58b0e63 PA |
768 | |
769 | /* For now, delete the parent's sr breakpoint, otherwise, | |
770 | parent/child sr breakpoints are considered duplicates, | |
771 | and the child version will not be installed. Remove | |
772 | this when the breakpoints module becomes aware of | |
773 | inferiors and address spaces. */ | |
774 | delete_step_resume_breakpoint (tp); | |
16c381f0 JK |
775 | tp->control.step_range_start = 0; |
776 | tp->control.step_range_end = 0; | |
777 | tp->control.step_frame_id = null_frame_id; | |
186c406b | 778 | delete_exception_resume_breakpoint (tp); |
e58b0e63 PA |
779 | } |
780 | ||
781 | parent = inferior_ptid; | |
183be222 | 782 | child = tp->pending_follow.child_ptid (); |
e58b0e63 | 783 | |
d8bbae6e SM |
784 | /* If handling a vfork, stop all the inferior's threads, they will be |
785 | restarted when the vfork shared region is complete. */ | |
786 | if (tp->pending_follow.kind () == TARGET_WAITKIND_VFORKED | |
787 | && target_is_non_stop_p ()) | |
788 | stop_all_threads ("handling vfork", tp->inf); | |
789 | ||
5b6d1e4f | 790 | process_stratum_target *parent_targ = tp->inf->process_target (); |
d83ad864 DB |
791 | /* Set up inferior(s) as specified by the caller, and tell the |
792 | target to do whatever is necessary to follow either parent | |
793 | or child. */ | |
794 | if (follow_fork_inferior (follow_child, detach_fork)) | |
e58b0e63 PA |
795 | { |
796 | /* Target refused to follow, or there's some other reason | |
797 | we shouldn't resume. */ | |
798 | should_resume = 0; | |
799 | } | |
800 | else | |
801 | { | |
e58b0e63 PA |
802 | /* This makes sure we don't try to apply the "Switched |
803 | over from WAIT_PID" logic above. */ | |
804 | nullify_last_target_wait_ptid (); | |
805 | ||
1777feb0 | 806 | /* If we followed the child, switch to it... */ |
e58b0e63 PA |
807 | if (follow_child) |
808 | { | |
5b6d1e4f | 809 | thread_info *child_thr = find_thread_ptid (parent_targ, child); |
00431a78 | 810 | switch_to_thread (child_thr); |
e58b0e63 PA |
811 | |
812 | /* ... and preserve the stepping state, in case the | |
813 | user was stepping over the fork call. */ | |
814 | if (should_resume) | |
815 | { | |
816 | tp = inferior_thread (); | |
8358c15c JK |
817 | tp->control.step_resume_breakpoint |
818 | = step_resume_breakpoint; | |
16c381f0 JK |
819 | tp->control.step_range_start = step_range_start; |
820 | tp->control.step_range_end = step_range_end; | |
bf4cb9be TV |
821 | tp->current_line = current_line; |
822 | tp->current_symtab = current_symtab; | |
16c381f0 | 823 | tp->control.step_frame_id = step_frame_id; |
186c406b TT |
824 | tp->control.exception_resume_breakpoint |
825 | = exception_resume_breakpoint; | |
573269a8 | 826 | tp->set_thread_fsm (std::move (thread_fsm)); |
e58b0e63 PA |
827 | } |
828 | else | |
829 | { | |
830 | /* If we get here, it was because we're trying to | |
831 | resume from a fork catchpoint, but, the user | |
832 | has switched threads away from the thread that | |
833 | forked. In that case, the resume command | |
834 | issued is most likely not applicable to the | |
835 | child, so just warn, and refuse to resume. */ | |
3e43a32a | 836 | warning (_("Not resuming: switched threads " |
fd7dcb94 | 837 | "before following fork child.")); |
e58b0e63 PA |
838 | } |
839 | ||
840 | /* Reset breakpoints in the child as appropriate. */ | |
841 | follow_inferior_reset_breakpoints (); | |
842 | } | |
e58b0e63 PA |
843 | } |
844 | } | |
845 | break; | |
846 | case TARGET_WAITKIND_SPURIOUS: | |
847 | /* Nothing to follow. */ | |
848 | break; | |
849 | default: | |
f34652de | 850 | internal_error ("Unexpected pending_follow.kind %d\n", |
183be222 | 851 | tp->pending_follow.kind ()); |
e58b0e63 PA |
852 | break; |
853 | } | |
c906108c | 854 | |
e58b0e63 | 855 | return should_resume; |
c906108c SS |
856 | } |
857 | ||
d83ad864 | 858 | static void |
6604731b | 859 | follow_inferior_reset_breakpoints (void) |
c906108c | 860 | { |
4e1c45ea PA |
861 | struct thread_info *tp = inferior_thread (); |
862 | ||
6604731b DJ |
863 | /* Was there a step_resume breakpoint? (There was if the user |
864 | did a "next" at the fork() call.) If so, explicitly reset its | |
a1aa2221 LM |
865 | thread number. Cloned step_resume breakpoints are disabled on |
866 | creation, so enable it here now that it is associated with the | |
867 | correct thread. | |
6604731b DJ |
868 | |
869 | step_resumes are a form of bp that are made to be per-thread. | |
870 | Since we created the step_resume bp when the parent process | |
871 | was being debugged, and now are switching to the child process, | |
872 | from the breakpoint package's viewpoint, that's a switch of | |
873 | "threads". We must update the bp's notion of which thread | |
874 | it is for, or it'll be ignored when it triggers. */ | |
875 | ||
8358c15c | 876 | if (tp->control.step_resume_breakpoint) |
a1aa2221 LM |
877 | { |
878 | breakpoint_re_set_thread (tp->control.step_resume_breakpoint); | |
879 | tp->control.step_resume_breakpoint->loc->enabled = 1; | |
880 | } | |
6604731b | 881 | |
a1aa2221 | 882 | /* Treat exception_resume breakpoints like step_resume breakpoints. */ |
186c406b | 883 | if (tp->control.exception_resume_breakpoint) |
a1aa2221 LM |
884 | { |
885 | breakpoint_re_set_thread (tp->control.exception_resume_breakpoint); | |
886 | tp->control.exception_resume_breakpoint->loc->enabled = 1; | |
887 | } | |
186c406b | 888 | |
6604731b DJ |
889 | /* Reinsert all breakpoints in the child. The user may have set |
890 | breakpoints after catching the fork, in which case those | |
891 | were never set in the child, but only in the parent. This makes | |
892 | sure the inserted breakpoints match the breakpoint list. */ | |
893 | ||
894 | breakpoint_re_set (); | |
895 | insert_breakpoints (); | |
c906108c | 896 | } |
c906108c | 897 | |
69eadcc9 SM |
898 | /* The child has exited or execed: resume THREAD, a thread of the parent, |
899 | if it was meant to be executing. */ | |
6c95b8df | 900 | |
69eadcc9 SM |
901 | static void |
902 | proceed_after_vfork_done (thread_info *thread) | |
6c95b8df | 903 | { |
69eadcc9 | 904 | if (thread->state == THREAD_RUNNING |
611841bb | 905 | && !thread->executing () |
6c95b8df | 906 | && !thread->stop_requested |
1edb66d8 | 907 | && thread->stop_signal () == GDB_SIGNAL_0) |
6c95b8df | 908 | { |
1eb8556f | 909 | infrun_debug_printf ("resuming vfork parent thread %s", |
0fab7955 | 910 | thread->ptid.to_string ().c_str ()); |
6c95b8df | 911 | |
00431a78 | 912 | switch_to_thread (thread); |
70509625 | 913 | clear_proceed_status (0); |
64ce06e4 | 914 | proceed ((CORE_ADDR) -1, GDB_SIGNAL_DEFAULT); |
6c95b8df | 915 | } |
6c95b8df PA |
916 | } |
917 | ||
918 | /* Called whenever we notice an exec or exit event, to handle | |
919 | detaching or resuming a vfork parent. */ | |
920 | ||
921 | static void | |
922 | handle_vfork_child_exec_or_exit (int exec) | |
923 | { | |
924 | struct inferior *inf = current_inferior (); | |
925 | ||
926 | if (inf->vfork_parent) | |
927 | { | |
69eadcc9 | 928 | inferior *resume_parent = nullptr; |
6c95b8df PA |
929 | |
930 | /* This exec or exit marks the end of the shared memory region | |
b73715df TV |
931 | between the parent and the child. Break the bonds. */ |
932 | inferior *vfork_parent = inf->vfork_parent; | |
03acd4d8 CL |
933 | inf->vfork_parent->vfork_child = nullptr; |
934 | inf->vfork_parent = nullptr; | |
6c95b8df | 935 | |
b73715df TV |
936 | /* If the user wanted to detach from the parent, now is the |
937 | time. */ | |
938 | if (vfork_parent->pending_detach) | |
6c95b8df | 939 | { |
6c95b8df PA |
940 | struct program_space *pspace; |
941 | struct address_space *aspace; | |
942 | ||
1777feb0 | 943 | /* follow-fork child, detach-on-fork on. */ |
6c95b8df | 944 | |
30220b46 | 945 | vfork_parent->pending_detach = false; |
68c9da30 | 946 | |
18493a00 | 947 | scoped_restore_current_pspace_and_thread restore_thread; |
6c95b8df PA |
948 | |
949 | /* We're letting loose of the parent. */ | |
18493a00 | 950 | thread_info *tp = any_live_thread_of_inferior (vfork_parent); |
00431a78 | 951 | switch_to_thread (tp); |
6c95b8df PA |
952 | |
953 | /* We're about to detach from the parent, which implicitly | |
954 | removes breakpoints from its address space. There's a | |
955 | catch here: we want to reuse the spaces for the child, | |
956 | but, parent/child are still sharing the pspace at this | |
957 | point, although the exec in reality makes the kernel give | |
958 | the child a fresh set of new pages. The problem here is | |
959 | that the breakpoints module being unaware of this, would | |
960 | likely chose the child process to write to the parent | |
961 | address space. Swapping the child temporarily away from | |
962 | the spaces has the desired effect. Yes, this is "sort | |
963 | of" a hack. */ | |
964 | ||
965 | pspace = inf->pspace; | |
966 | aspace = inf->aspace; | |
03acd4d8 CL |
967 | inf->aspace = nullptr; |
968 | inf->pspace = nullptr; | |
6c95b8df | 969 | |
f67c0c91 | 970 | if (print_inferior_events) |
6c95b8df | 971 | { |
a068643d | 972 | std::string pidstr |
b73715df | 973 | = target_pid_to_str (ptid_t (vfork_parent->pid)); |
f67c0c91 | 974 | |
223ffa71 | 975 | target_terminal::ours_for_output (); |
6c95b8df PA |
976 | |
977 | if (exec) | |
6f259a23 | 978 | { |
6cb06a8c TT |
979 | gdb_printf (_("[Detaching vfork parent %s " |
980 | "after child exec]\n"), pidstr.c_str ()); | |
6f259a23 | 981 | } |
6c95b8df | 982 | else |
6f259a23 | 983 | { |
6cb06a8c TT |
984 | gdb_printf (_("[Detaching vfork parent %s " |
985 | "after child exit]\n"), pidstr.c_str ()); | |
6f259a23 | 986 | } |
6c95b8df PA |
987 | } |
988 | ||
b73715df | 989 | target_detach (vfork_parent, 0); |
6c95b8df PA |
990 | |
991 | /* Put it back. */ | |
992 | inf->pspace = pspace; | |
993 | inf->aspace = aspace; | |
6c95b8df PA |
994 | } |
995 | else if (exec) | |
996 | { | |
997 | /* We're staying attached to the parent, so, really give the | |
998 | child a new address space. */ | |
564b1e3f | 999 | inf->pspace = new program_space (maybe_new_address_space ()); |
6c95b8df | 1000 | inf->aspace = inf->pspace->aspace; |
30220b46 | 1001 | inf->removable = true; |
6c95b8df PA |
1002 | set_current_program_space (inf->pspace); |
1003 | ||
69eadcc9 | 1004 | resume_parent = vfork_parent; |
6c95b8df PA |
1005 | } |
1006 | else | |
1007 | { | |
6c95b8df PA |
1008 | /* If this is a vfork child exiting, then the pspace and |
1009 | aspaces were shared with the parent. Since we're | |
1010 | reporting the process exit, we'll be mourning all that is | |
1011 | found in the address space, and switching to null_ptid, | |
1012 | preparing to start a new inferior. But, since we don't | |
1013 | want to clobber the parent's address/program spaces, we | |
1014 | go ahead and create a new one for this exiting | |
1015 | inferior. */ | |
1016 | ||
18493a00 | 1017 | /* Switch to no-thread while running clone_program_space, so |
5ed8105e PA |
1018 | that clone_program_space doesn't want to read the |
1019 | selected frame of a dead process. */ | |
18493a00 PA |
1020 | scoped_restore_current_thread restore_thread; |
1021 | switch_to_no_thread (); | |
6c95b8df | 1022 | |
53af73bf PA |
1023 | inf->pspace = new program_space (maybe_new_address_space ()); |
1024 | inf->aspace = inf->pspace->aspace; | |
1025 | set_current_program_space (inf->pspace); | |
30220b46 | 1026 | inf->removable = true; |
7dcd53a0 | 1027 | inf->symfile_flags = SYMFILE_NO_READ; |
53af73bf | 1028 | clone_program_space (inf->pspace, vfork_parent->pspace); |
6c95b8df | 1029 | |
69eadcc9 | 1030 | resume_parent = vfork_parent; |
6c95b8df PA |
1031 | } |
1032 | ||
6c95b8df PA |
1033 | gdb_assert (current_program_space == inf->pspace); |
1034 | ||
69eadcc9 | 1035 | if (non_stop && resume_parent != nullptr) |
6c95b8df PA |
1036 | { |
1037 | /* If the user wanted the parent to be running, let it go | |
1038 | free now. */ | |
5ed8105e | 1039 | scoped_restore_current_thread restore_thread; |
6c95b8df | 1040 | |
1eb8556f | 1041 | infrun_debug_printf ("resuming vfork parent process %d", |
69eadcc9 | 1042 | resume_parent->pid); |
6c95b8df | 1043 | |
69eadcc9 SM |
1044 | for (thread_info *thread : resume_parent->threads ()) |
1045 | proceed_after_vfork_done (thread); | |
6c95b8df PA |
1046 | } |
1047 | } | |
1048 | } | |
1049 | ||
d8bbae6e SM |
1050 | /* Handle TARGET_WAITKIND_VFORK_DONE. */ |
1051 | ||
1052 | static void | |
1053 | handle_vfork_done (thread_info *event_thread) | |
1054 | { | |
1055 | /* We only care about this event if inferior::thread_waiting_for_vfork_done is | |
1056 | set, that is if we are waiting for a vfork child not under our control | |
1057 | (because we detached it) to exec or exit. | |
1058 | ||
1059 | If an inferior has vforked and we are debugging the child, we don't use | |
1060 | the vfork-done event to get notified about the end of the shared address | |
1061 | space window. We rely instead on the child's exec or exit event, and the | |
1062 | inferior::vfork_{parent,child} fields are used instead. See | |
1063 | handle_vfork_child_exec_or_exit for that. */ | |
1064 | if (event_thread->inf->thread_waiting_for_vfork_done == nullptr) | |
1065 | { | |
1066 | infrun_debug_printf ("not waiting for a vfork-done event"); | |
1067 | return; | |
1068 | } | |
1069 | ||
1070 | INFRUN_SCOPED_DEBUG_ENTER_EXIT; | |
1071 | ||
1072 | /* We stopped all threads (other than the vforking thread) of the inferior in | |
1073 | follow_fork and kept them stopped until now. It should therefore not be | |
1074 | possible for another thread to have reported a vfork during that window. | |
1075 | If THREAD_WAITING_FOR_VFORK_DONE is set, it has to be the same thread whose | |
1076 | vfork-done we are handling right now. */ | |
1077 | gdb_assert (event_thread->inf->thread_waiting_for_vfork_done == event_thread); | |
1078 | ||
1079 | event_thread->inf->thread_waiting_for_vfork_done = nullptr; | |
1080 | event_thread->inf->pspace->breakpoints_not_allowed = 0; | |
1081 | ||
1082 | /* On non-stop targets, we stopped all the inferior's threads in follow_fork, | |
1083 | resume them now. On all-stop targets, everything that needs to be resumed | |
1084 | will be when we resume the event thread. */ | |
1085 | if (target_is_non_stop_p ()) | |
1086 | { | |
1087 | /* restart_threads and start_step_over may change the current thread, make | |
1088 | sure we leave the event thread as the current thread. */ | |
1089 | scoped_restore_current_thread restore_thread; | |
1090 | ||
1091 | insert_breakpoints (); | |
d8bbae6e | 1092 | start_step_over (); |
2b718529 LS |
1093 | |
1094 | if (!step_over_info_valid_p ()) | |
1095 | restart_threads (event_thread, event_thread->inf); | |
d8bbae6e SM |
1096 | } |
1097 | } | |
1098 | ||
eb6c553b | 1099 | /* Enum strings for "set|show follow-exec-mode". */ |
6c95b8df PA |
1100 | |
1101 | static const char follow_exec_mode_new[] = "new"; | |
1102 | static const char follow_exec_mode_same[] = "same"; | |
40478521 | 1103 | static const char *const follow_exec_mode_names[] = |
6c95b8df PA |
1104 | { |
1105 | follow_exec_mode_new, | |
1106 | follow_exec_mode_same, | |
03acd4d8 | 1107 | nullptr, |
6c95b8df PA |
1108 | }; |
1109 | ||
1110 | static const char *follow_exec_mode_string = follow_exec_mode_same; | |
1111 | static void | |
1112 | show_follow_exec_mode_string (struct ui_file *file, int from_tty, | |
1113 | struct cmd_list_element *c, const char *value) | |
1114 | { | |
6cb06a8c | 1115 | gdb_printf (file, _("Follow exec mode is \"%s\".\n"), value); |
6c95b8df PA |
1116 | } |
1117 | ||
ecf45d2c | 1118 | /* EXEC_FILE_TARGET is assumed to be non-NULL. */ |
1adeb98a | 1119 | |
c906108c | 1120 | static void |
4ca51187 | 1121 | follow_exec (ptid_t ptid, const char *exec_file_target) |
c906108c | 1122 | { |
e99b03dc | 1123 | int pid = ptid.pid (); |
94585166 | 1124 | ptid_t process_ptid; |
7a292a7a | 1125 | |
65d2b333 PW |
1126 | /* Switch terminal for any messages produced e.g. by |
1127 | breakpoint_re_set. */ | |
1128 | target_terminal::ours_for_output (); | |
1129 | ||
c906108c SS |
1130 | /* This is an exec event that we actually wish to pay attention to. |
1131 | Refresh our symbol table to the newly exec'd program, remove any | |
1132 | momentary bp's, etc. | |
1133 | ||
1134 | If there are breakpoints, they aren't really inserted now, | |
1135 | since the exec() transformed our inferior into a fresh set | |
1136 | of instructions. | |
1137 | ||
1138 | We want to preserve symbolic breakpoints on the list, since | |
1139 | we have hopes that they can be reset after the new a.out's | |
1140 | symbol table is read. | |
1141 | ||
1142 | However, any "raw" breakpoints must be removed from the list | |
1143 | (e.g., the solib bp's), since their address is probably invalid | |
1144 | now. | |
1145 | ||
1146 | And, we DON'T want to call delete_breakpoints() here, since | |
1147 | that may write the bp's "shadow contents" (the instruction | |
85102364 | 1148 | value that was overwritten with a TRAP instruction). Since |
1777feb0 | 1149 | we now have a new a.out, those shadow contents aren't valid. */ |
6c95b8df PA |
1150 | |
1151 | mark_breakpoints_out (); | |
1152 | ||
95e50b27 PA |
1153 | /* The target reports the exec event to the main thread, even if |
1154 | some other thread does the exec, and even if the main thread was | |
1155 | stopped or already gone. We may still have non-leader threads of | |
1156 | the process on our list. E.g., on targets that don't have thread | |
1157 | exit events (like remote); or on native Linux in non-stop mode if | |
1158 | there were only two threads in the inferior and the non-leader | |
1159 | one is the one that execs (and nothing forces an update of the | |
1160 | thread list up to here). When debugging remotely, it's best to | |
1161 | avoid extra traffic, when possible, so avoid syncing the thread | |
1162 | list with the target, and instead go ahead and delete all threads | |
1163 | of the process but one that reported the event. Note this must | |
1164 | be done before calling update_breakpoints_after_exec, as | |
1165 | otherwise clearing the threads' resources would reference stale | |
1166 | thread breakpoints -- it may have been one of these threads that | |
1167 | stepped across the exec. We could just clear their stepping | |
1168 | states, but as long as we're iterating, might as well delete | |
1169 | them. Deleting them now rather than at the next user-visible | |
1170 | stop provides a nicer sequence of events for user and MI | |
1171 | notifications. */ | |
08036331 | 1172 | for (thread_info *th : all_threads_safe ()) |
d7e15655 | 1173 | if (th->ptid.pid () == pid && th->ptid != ptid) |
00431a78 | 1174 | delete_thread (th); |
95e50b27 PA |
1175 | |
1176 | /* We also need to clear any left over stale state for the | |
1177 | leader/event thread. E.g., if there was any step-resume | |
1178 | breakpoint or similar, it's gone now. We cannot truly | |
1179 | step-to-next statement through an exec(). */ | |
08036331 | 1180 | thread_info *th = inferior_thread (); |
03acd4d8 CL |
1181 | th->control.step_resume_breakpoint = nullptr; |
1182 | th->control.exception_resume_breakpoint = nullptr; | |
1183 | th->control.single_step_breakpoints = nullptr; | |
16c381f0 JK |
1184 | th->control.step_range_start = 0; |
1185 | th->control.step_range_end = 0; | |
c906108c | 1186 | |
95e50b27 PA |
1187 | /* The user may have had the main thread held stopped in the |
1188 | previous image (e.g., schedlock on, or non-stop). Release | |
1189 | it now. */ | |
a75724bc PA |
1190 | th->stop_requested = 0; |
1191 | ||
95e50b27 PA |
1192 | update_breakpoints_after_exec (); |
1193 | ||
1777feb0 | 1194 | /* What is this a.out's name? */ |
f2907e49 | 1195 | process_ptid = ptid_t (pid); |
6cb06a8c TT |
1196 | gdb_printf (_("%s is executing new program: %s\n"), |
1197 | target_pid_to_str (process_ptid).c_str (), | |
1198 | exec_file_target); | |
c906108c SS |
1199 | |
1200 | /* We've followed the inferior through an exec. Therefore, the | |
1777feb0 | 1201 | inferior has essentially been killed & reborn. */ |
7a292a7a | 1202 | |
6ca15a4b | 1203 | breakpoint_init_inferior (inf_execd); |
e85a822c | 1204 | |
797bc1cb | 1205 | gdb::unique_xmalloc_ptr<char> exec_file_host |
03acd4d8 | 1206 | = exec_file_find (exec_file_target, nullptr); |
ff862be4 | 1207 | |
ecf45d2c SL |
1208 | /* If we were unable to map the executable target pathname onto a host |
1209 | pathname, tell the user that. Otherwise GDB's subsequent behavior | |
1210 | is confusing. Maybe it would even be better to stop at this point | |
1211 | so that the user can specify a file manually before continuing. */ | |
03acd4d8 | 1212 | if (exec_file_host == nullptr) |
ecf45d2c SL |
1213 | warning (_("Could not load symbols for executable %s.\n" |
1214 | "Do you need \"set sysroot\"?"), | |
1215 | exec_file_target); | |
c906108c | 1216 | |
cce9b6bf PA |
1217 | /* Reset the shared library package. This ensures that we get a |
1218 | shlib event when the child reaches "_start", at which point the | |
1219 | dld will have had a chance to initialize the child. */ | |
1220 | /* Also, loading a symbol file below may trigger symbol lookups, and | |
1221 | we don't want those to be satisfied by the libraries of the | |
1222 | previous incarnation of this process. */ | |
03acd4d8 | 1223 | no_shared_libraries (nullptr, 0); |
cce9b6bf | 1224 | |
294c36eb SM |
1225 | struct inferior *inf = current_inferior (); |
1226 | ||
6c95b8df PA |
1227 | if (follow_exec_mode_string == follow_exec_mode_new) |
1228 | { | |
6c95b8df PA |
1229 | /* The user wants to keep the old inferior and program spaces |
1230 | around. Create a new fresh one, and switch to it. */ | |
1231 | ||
35ed81d4 SM |
1232 | /* Do exit processing for the original inferior before setting the new |
1233 | inferior's pid. Having two inferiors with the same pid would confuse | |
1234 | find_inferior_p(t)id. Transfer the terminal state and info from the | |
1235 | old to the new inferior. */ | |
294c36eb SM |
1236 | inferior *new_inferior = add_inferior_with_spaces (); |
1237 | ||
1238 | swap_terminal_info (new_inferior, inf); | |
1239 | exit_inferior_silent (inf); | |
1240 | ||
1241 | new_inferior->pid = pid; | |
1242 | target_follow_exec (new_inferior, ptid, exec_file_target); | |
1243 | ||
1244 | /* We continue with the new inferior. */ | |
1245 | inf = new_inferior; | |
6c95b8df | 1246 | } |
9107fc8d PA |
1247 | else |
1248 | { | |
1249 | /* The old description may no longer be fit for the new image. | |
1250 | E.g, a 64-bit process exec'ed a 32-bit process. Clear the | |
1251 | old description; we'll read a new one below. No need to do | |
1252 | this on "follow-exec-mode new", as the old inferior stays | |
1253 | around (its description is later cleared/refetched on | |
1254 | restart). */ | |
1255 | target_clear_description (); | |
294c36eb | 1256 | target_follow_exec (inf, ptid, exec_file_target); |
9107fc8d | 1257 | } |
6c95b8df | 1258 | |
294c36eb | 1259 | gdb_assert (current_inferior () == inf); |
6c95b8df PA |
1260 | gdb_assert (current_program_space == inf->pspace); |
1261 | ||
ecf45d2c SL |
1262 | /* Attempt to open the exec file. SYMFILE_DEFER_BP_RESET is used |
1263 | because the proper displacement for a PIE (Position Independent | |
1264 | Executable) main symbol file will only be computed by | |
1265 | solib_create_inferior_hook below. breakpoint_re_set would fail | |
1266 | to insert the breakpoints with the zero displacement. */ | |
797bc1cb | 1267 | try_open_exec_file (exec_file_host.get (), inf, SYMFILE_DEFER_BP_RESET); |
c906108c | 1268 | |
9107fc8d PA |
1269 | /* If the target can specify a description, read it. Must do this |
1270 | after flipping to the new executable (because the target supplied | |
1271 | description must be compatible with the executable's | |
1272 | architecture, and the old executable may e.g., be 32-bit, while | |
1273 | the new one 64-bit), and before anything involving memory or | |
1274 | registers. */ | |
1275 | target_find_description (); | |
1276 | ||
42a4fec5 | 1277 | gdb::observers::inferior_execd.notify (inf); |
4efc6507 | 1278 | |
c1e56572 JK |
1279 | breakpoint_re_set (); |
1280 | ||
c906108c SS |
1281 | /* Reinsert all breakpoints. (Those which were symbolic have |
1282 | been reset to the proper address in the new a.out, thanks | |
1777feb0 | 1283 | to symbol_file_command...). */ |
c906108c SS |
1284 | insert_breakpoints (); |
1285 | ||
1286 | /* The next resume of this inferior should bring it to the shlib | |
1287 | startup breakpoints. (If the user had also set bp's on | |
1288 | "main" from the old (parent) process, then they'll auto- | |
1777feb0 | 1289 | matically get reset there in the new process.). */ |
c906108c SS |
1290 | } |
1291 | ||
28d5518b | 1292 | /* The chain of threads that need to do a step-over operation to get |
c2829269 PA |
1293 | past e.g., a breakpoint. What technique is used to step over the |
1294 | breakpoint/watchpoint does not matter -- all threads end up in the | |
1295 | same queue, to maintain rough temporal order of execution, in order | |
1296 | to avoid starvation, otherwise, we could e.g., find ourselves | |
1297 | constantly stepping the same couple threads past their breakpoints | |
1298 | over and over, if the single-step finish fast enough. */ | |
8b6a69b2 | 1299 | thread_step_over_list global_thread_step_over_list; |
c2829269 | 1300 | |
6c4cfb24 PA |
1301 | /* Bit flags indicating what the thread needs to step over. */ |
1302 | ||
8d297bbf | 1303 | enum step_over_what_flag |
6c4cfb24 PA |
1304 | { |
1305 | /* Step over a breakpoint. */ | |
1306 | STEP_OVER_BREAKPOINT = 1, | |
1307 | ||
1308 | /* Step past a non-continuable watchpoint, in order to let the | |
1309 | instruction execute so we can evaluate the watchpoint | |
1310 | expression. */ | |
1311 | STEP_OVER_WATCHPOINT = 2 | |
1312 | }; | |
8d297bbf | 1313 | DEF_ENUM_FLAGS_TYPE (enum step_over_what_flag, step_over_what); |
6c4cfb24 | 1314 | |
963f9c80 | 1315 | /* Info about an instruction that is being stepped over. */ |
31e77af2 PA |
1316 | |
1317 | struct step_over_info | |
1318 | { | |
963f9c80 PA |
1319 | /* If we're stepping past a breakpoint, this is the address space |
1320 | and address of the instruction the breakpoint is set at. We'll | |
1321 | skip inserting all breakpoints here. Valid iff ASPACE is | |
1322 | non-NULL. */ | |
ac7d717c PA |
1323 | const address_space *aspace = nullptr; |
1324 | CORE_ADDR address = 0; | |
963f9c80 PA |
1325 | |
1326 | /* The instruction being stepped over triggers a nonsteppable | |
1327 | watchpoint. If true, we'll skip inserting watchpoints. */ | |
ac7d717c | 1328 | int nonsteppable_watchpoint_p = 0; |
21edc42f YQ |
1329 | |
1330 | /* The thread's global number. */ | |
ac7d717c | 1331 | int thread = -1; |
31e77af2 PA |
1332 | }; |
1333 | ||
1334 | /* The step-over info of the location that is being stepped over. | |
1335 | ||
1336 | Note that with async/breakpoint always-inserted mode, a user might | |
1337 | set a new breakpoint/watchpoint/etc. exactly while a breakpoint is | |
1338 | being stepped over. As setting a new breakpoint inserts all | |
1339 | breakpoints, we need to make sure the breakpoint being stepped over | |
1340 | isn't inserted then. We do that by only clearing the step-over | |
1341 | info when the step-over is actually finished (or aborted). | |
1342 | ||
1343 | Presently GDB can only step over one breakpoint at any given time. | |
1344 | Given threads that can't run code in the same address space as the | |
1345 | breakpoint's can't really miss the breakpoint, GDB could be taught | |
1346 | to step-over at most one breakpoint per address space (so this info | |
1347 | could move to the address space object if/when GDB is extended). | |
1348 | The set of breakpoints being stepped over will normally be much | |
1349 | smaller than the set of all breakpoints, so a flag in the | |
1350 | breakpoint location structure would be wasteful. A separate list | |
1351 | also saves complexity and run-time, as otherwise we'd have to go | |
1352 | through all breakpoint locations clearing their flag whenever we | |
1353 | start a new sequence. Similar considerations weigh against storing | |
1354 | this info in the thread object. Plus, not all step overs actually | |
1355 | have breakpoint locations -- e.g., stepping past a single-step | |
1356 | breakpoint, or stepping to complete a non-continuable | |
1357 | watchpoint. */ | |
1358 | static struct step_over_info step_over_info; | |
1359 | ||
1360 | /* Record the address of the breakpoint/instruction we're currently | |
ce0db137 DE |
1361 | stepping over. |
1362 | N.B. We record the aspace and address now, instead of say just the thread, | |
1363 | because when we need the info later the thread may be running. */ | |
31e77af2 PA |
1364 | |
1365 | static void | |
8b86c959 | 1366 | set_step_over_info (const address_space *aspace, CORE_ADDR address, |
21edc42f YQ |
1367 | int nonsteppable_watchpoint_p, |
1368 | int thread) | |
31e77af2 PA |
1369 | { |
1370 | step_over_info.aspace = aspace; | |
1371 | step_over_info.address = address; | |
963f9c80 | 1372 | step_over_info.nonsteppable_watchpoint_p = nonsteppable_watchpoint_p; |
21edc42f | 1373 | step_over_info.thread = thread; |
31e77af2 PA |
1374 | } |
1375 | ||
1376 | /* Called when we're not longer stepping over a breakpoint / an | |
1377 | instruction, so all breakpoints are free to be (re)inserted. */ | |
1378 | ||
1379 | static void | |
1380 | clear_step_over_info (void) | |
1381 | { | |
1eb8556f | 1382 | infrun_debug_printf ("clearing step over info"); |
03acd4d8 | 1383 | step_over_info.aspace = nullptr; |
31e77af2 | 1384 | step_over_info.address = 0; |
963f9c80 | 1385 | step_over_info.nonsteppable_watchpoint_p = 0; |
21edc42f | 1386 | step_over_info.thread = -1; |
31e77af2 PA |
1387 | } |
1388 | ||
7f89fd65 | 1389 | /* See infrun.h. */ |
31e77af2 PA |
1390 | |
1391 | int | |
1392 | stepping_past_instruction_at (struct address_space *aspace, | |
1393 | CORE_ADDR address) | |
1394 | { | |
03acd4d8 | 1395 | return (step_over_info.aspace != nullptr |
31e77af2 PA |
1396 | && breakpoint_address_match (aspace, address, |
1397 | step_over_info.aspace, | |
1398 | step_over_info.address)); | |
1399 | } | |
1400 | ||
963f9c80 PA |
1401 | /* See infrun.h. */ |
1402 | ||
21edc42f YQ |
1403 | int |
1404 | thread_is_stepping_over_breakpoint (int thread) | |
1405 | { | |
1406 | return (step_over_info.thread != -1 | |
1407 | && thread == step_over_info.thread); | |
1408 | } | |
1409 | ||
1410 | /* See infrun.h. */ | |
1411 | ||
963f9c80 PA |
1412 | int |
1413 | stepping_past_nonsteppable_watchpoint (void) | |
1414 | { | |
1415 | return step_over_info.nonsteppable_watchpoint_p; | |
1416 | } | |
1417 | ||
6cc83d2a PA |
1418 | /* Returns true if step-over info is valid. */ |
1419 | ||
c4464ade | 1420 | static bool |
6cc83d2a PA |
1421 | step_over_info_valid_p (void) |
1422 | { | |
03acd4d8 | 1423 | return (step_over_info.aspace != nullptr |
963f9c80 | 1424 | || stepping_past_nonsteppable_watchpoint ()); |
6cc83d2a PA |
1425 | } |
1426 | ||
c906108c | 1427 | \f |
237fc4c9 PA |
1428 | /* Displaced stepping. */ |
1429 | ||
1430 | /* In non-stop debugging mode, we must take special care to manage | |
1431 | breakpoints properly; in particular, the traditional strategy for | |
1432 | stepping a thread past a breakpoint it has hit is unsuitable. | |
1433 | 'Displaced stepping' is a tactic for stepping one thread past a | |
1434 | breakpoint it has hit while ensuring that other threads running | |
1435 | concurrently will hit the breakpoint as they should. | |
1436 | ||
1437 | The traditional way to step a thread T off a breakpoint in a | |
1438 | multi-threaded program in all-stop mode is as follows: | |
1439 | ||
1440 | a0) Initially, all threads are stopped, and breakpoints are not | |
1441 | inserted. | |
1442 | a1) We single-step T, leaving breakpoints uninserted. | |
1443 | a2) We insert breakpoints, and resume all threads. | |
1444 | ||
1445 | In non-stop debugging, however, this strategy is unsuitable: we | |
1446 | don't want to have to stop all threads in the system in order to | |
1447 | continue or step T past a breakpoint. Instead, we use displaced | |
1448 | stepping: | |
1449 | ||
1450 | n0) Initially, T is stopped, other threads are running, and | |
1451 | breakpoints are inserted. | |
1452 | n1) We copy the instruction "under" the breakpoint to a separate | |
1453 | location, outside the main code stream, making any adjustments | |
1454 | to the instruction, register, and memory state as directed by | |
1455 | T's architecture. | |
1456 | n2) We single-step T over the instruction at its new location. | |
1457 | n3) We adjust the resulting register and memory state as directed | |
1458 | by T's architecture. This includes resetting T's PC to point | |
1459 | back into the main instruction stream. | |
1460 | n4) We resume T. | |
1461 | ||
1462 | This approach depends on the following gdbarch methods: | |
1463 | ||
1464 | - gdbarch_max_insn_length and gdbarch_displaced_step_location | |
1465 | indicate where to copy the instruction, and how much space must | |
1466 | be reserved there. We use these in step n1. | |
1467 | ||
1468 | - gdbarch_displaced_step_copy_insn copies a instruction to a new | |
1469 | address, and makes any necessary adjustments to the instruction, | |
1470 | register contents, and memory. We use this in step n1. | |
1471 | ||
1472 | - gdbarch_displaced_step_fixup adjusts registers and memory after | |
85102364 | 1473 | we have successfully single-stepped the instruction, to yield the |
237fc4c9 PA |
1474 | same effect the instruction would have had if we had executed it |
1475 | at its original address. We use this in step n3. | |
1476 | ||
237fc4c9 PA |
1477 | The gdbarch_displaced_step_copy_insn and |
1478 | gdbarch_displaced_step_fixup functions must be written so that | |
1479 | copying an instruction with gdbarch_displaced_step_copy_insn, | |
1480 | single-stepping across the copied instruction, and then applying | |
1481 | gdbarch_displaced_insn_fixup should have the same effects on the | |
1482 | thread's memory and registers as stepping the instruction in place | |
1483 | would have. Exactly which responsibilities fall to the copy and | |
1484 | which fall to the fixup is up to the author of those functions. | |
1485 | ||
1486 | See the comments in gdbarch.sh for details. | |
1487 | ||
1488 | Note that displaced stepping and software single-step cannot | |
1489 | currently be used in combination, although with some care I think | |
1490 | they could be made to. Software single-step works by placing | |
1491 | breakpoints on all possible subsequent instructions; if the | |
1492 | displaced instruction is a PC-relative jump, those breakpoints | |
1493 | could fall in very strange places --- on pages that aren't | |
1494 | executable, or at addresses that are not proper instruction | |
1495 | boundaries. (We do generally let other threads run while we wait | |
1496 | to hit the software single-step breakpoint, and they might | |
1497 | encounter such a corrupted instruction.) One way to work around | |
1498 | this would be to have gdbarch_displaced_step_copy_insn fully | |
1499 | simulate the effect of PC-relative instructions (and return NULL) | |
1500 | on architectures that use software single-stepping. | |
1501 | ||
1502 | In non-stop mode, we can have independent and simultaneous step | |
1503 | requests, so more than one thread may need to simultaneously step | |
1504 | over a breakpoint. The current implementation assumes there is | |
1505 | only one scratch space per process. In this case, we have to | |
1506 | serialize access to the scratch space. If thread A wants to step | |
1507 | over a breakpoint, but we are currently waiting for some other | |
1508 | thread to complete a displaced step, we leave thread A stopped and | |
1509 | place it in the displaced_step_request_queue. Whenever a displaced | |
1510 | step finishes, we pick the next thread in the queue and start a new | |
1511 | displaced step operation on it. See displaced_step_prepare and | |
7def77a1 | 1512 | displaced_step_finish for details. */ |
237fc4c9 | 1513 | |
a46d1843 | 1514 | /* Return true if THREAD is doing a displaced step. */ |
c0987663 | 1515 | |
c4464ade | 1516 | static bool |
00431a78 | 1517 | displaced_step_in_progress_thread (thread_info *thread) |
c0987663 | 1518 | { |
03acd4d8 | 1519 | gdb_assert (thread != nullptr); |
c0987663 | 1520 | |
187b041e | 1521 | return thread->displaced_step_state.in_progress (); |
c0987663 YQ |
1522 | } |
1523 | ||
a46d1843 | 1524 | /* Return true if INF has a thread doing a displaced step. */ |
8f572e5c | 1525 | |
c4464ade | 1526 | static bool |
00431a78 | 1527 | displaced_step_in_progress (inferior *inf) |
8f572e5c | 1528 | { |
187b041e | 1529 | return inf->displaced_step_state.in_progress_count > 0; |
fc1cf338 PA |
1530 | } |
1531 | ||
187b041e | 1532 | /* Return true if any thread is doing a displaced step. */ |
a42244db | 1533 | |
187b041e SM |
1534 | static bool |
1535 | displaced_step_in_progress_any_thread () | |
a42244db | 1536 | { |
187b041e SM |
1537 | for (inferior *inf : all_non_exited_inferiors ()) |
1538 | { | |
1539 | if (displaced_step_in_progress (inf)) | |
1540 | return true; | |
1541 | } | |
a42244db | 1542 | |
187b041e | 1543 | return false; |
a42244db YQ |
1544 | } |
1545 | ||
fc1cf338 PA |
1546 | static void |
1547 | infrun_inferior_exit (struct inferior *inf) | |
1548 | { | |
d20172fc | 1549 | inf->displaced_step_state.reset (); |
6f5d514f | 1550 | inf->thread_waiting_for_vfork_done = nullptr; |
fc1cf338 | 1551 | } |
237fc4c9 | 1552 | |
3b7a962d SM |
1553 | static void |
1554 | infrun_inferior_execd (inferior *inf) | |
1555 | { | |
187b041e SM |
1556 | /* If some threads where was doing a displaced step in this inferior at the |
1557 | moment of the exec, they no longer exist. Even if the exec'ing thread | |
3b7a962d SM |
1558 | doing a displaced step, we don't want to to any fixup nor restore displaced |
1559 | stepping buffer bytes. */ | |
1560 | inf->displaced_step_state.reset (); | |
1561 | ||
187b041e SM |
1562 | for (thread_info *thread : inf->threads ()) |
1563 | thread->displaced_step_state.reset (); | |
1564 | ||
3b7a962d SM |
1565 | /* Since an in-line step is done with everything else stopped, if there was |
1566 | one in progress at the time of the exec, it must have been the exec'ing | |
1567 | thread. */ | |
1568 | clear_step_over_info (); | |
6f5d514f SM |
1569 | |
1570 | inf->thread_waiting_for_vfork_done = nullptr; | |
3b7a962d SM |
1571 | } |
1572 | ||
fff08868 HZ |
1573 | /* If ON, and the architecture supports it, GDB will use displaced |
1574 | stepping to step over breakpoints. If OFF, or if the architecture | |
1575 | doesn't support it, GDB will instead use the traditional | |
1576 | hold-and-step approach. If AUTO (which is the default), GDB will | |
1577 | decide which technique to use to step over breakpoints depending on | |
9822cb57 | 1578 | whether the target works in a non-stop way (see use_displaced_stepping). */ |
fff08868 | 1579 | |
72d0e2c5 | 1580 | static enum auto_boolean can_use_displaced_stepping = AUTO_BOOLEAN_AUTO; |
fff08868 | 1581 | |
237fc4c9 PA |
1582 | static void |
1583 | show_can_use_displaced_stepping (struct ui_file *file, int from_tty, | |
1584 | struct cmd_list_element *c, | |
1585 | const char *value) | |
1586 | { | |
72d0e2c5 | 1587 | if (can_use_displaced_stepping == AUTO_BOOLEAN_AUTO) |
6cb06a8c TT |
1588 | gdb_printf (file, |
1589 | _("Debugger's willingness to use displaced stepping " | |
1590 | "to step over breakpoints is %s (currently %s).\n"), | |
1591 | value, target_is_non_stop_p () ? "on" : "off"); | |
fff08868 | 1592 | else |
6cb06a8c TT |
1593 | gdb_printf (file, |
1594 | _("Debugger's willingness to use displaced stepping " | |
1595 | "to step over breakpoints is %s.\n"), value); | |
237fc4c9 PA |
1596 | } |
1597 | ||
9822cb57 SM |
1598 | /* Return true if the gdbarch implements the required methods to use |
1599 | displaced stepping. */ | |
1600 | ||
1601 | static bool | |
1602 | gdbarch_supports_displaced_stepping (gdbarch *arch) | |
1603 | { | |
187b041e SM |
1604 | /* Only check for the presence of `prepare`. The gdbarch verification ensures |
1605 | that if `prepare` is provided, so is `finish`. */ | |
1606 | return gdbarch_displaced_step_prepare_p (arch); | |
9822cb57 SM |
1607 | } |
1608 | ||
fff08868 | 1609 | /* Return non-zero if displaced stepping can/should be used to step |
3fc8eb30 | 1610 | over breakpoints of thread TP. */ |
fff08868 | 1611 | |
9822cb57 SM |
1612 | static bool |
1613 | use_displaced_stepping (thread_info *tp) | |
237fc4c9 | 1614 | { |
9822cb57 SM |
1615 | /* If the user disabled it explicitly, don't use displaced stepping. */ |
1616 | if (can_use_displaced_stepping == AUTO_BOOLEAN_FALSE) | |
1617 | return false; | |
1618 | ||
1619 | /* If "auto", only use displaced stepping if the target operates in a non-stop | |
1620 | way. */ | |
1621 | if (can_use_displaced_stepping == AUTO_BOOLEAN_AUTO | |
1622 | && !target_is_non_stop_p ()) | |
1623 | return false; | |
1624 | ||
1625 | gdbarch *gdbarch = get_thread_regcache (tp)->arch (); | |
1626 | ||
1627 | /* If the architecture doesn't implement displaced stepping, don't use | |
1628 | it. */ | |
1629 | if (!gdbarch_supports_displaced_stepping (gdbarch)) | |
1630 | return false; | |
1631 | ||
1632 | /* If recording, don't use displaced stepping. */ | |
1633 | if (find_record_target () != nullptr) | |
1634 | return false; | |
1635 | ||
9822cb57 SM |
1636 | /* If displaced stepping failed before for this inferior, don't bother trying |
1637 | again. */ | |
f5f01699 | 1638 | if (tp->inf->displaced_step_state.failed_before) |
9822cb57 SM |
1639 | return false; |
1640 | ||
1641 | return true; | |
237fc4c9 PA |
1642 | } |
1643 | ||
187b041e | 1644 | /* Simple function wrapper around displaced_step_thread_state::reset. */ |
d8d83535 | 1645 | |
237fc4c9 | 1646 | static void |
187b041e | 1647 | displaced_step_reset (displaced_step_thread_state *displaced) |
237fc4c9 | 1648 | { |
d8d83535 | 1649 | displaced->reset (); |
237fc4c9 PA |
1650 | } |
1651 | ||
d8d83535 SM |
1652 | /* A cleanup that wraps displaced_step_reset. We use this instead of, say, |
1653 | SCOPE_EXIT, because it needs to be discardable with "cleanup.release ()". */ | |
1654 | ||
1655 | using displaced_step_reset_cleanup = FORWARD_SCOPE_EXIT (displaced_step_reset); | |
237fc4c9 | 1656 | |
136821d9 SM |
1657 | /* See infrun.h. */ |
1658 | ||
1659 | std::string | |
1660 | displaced_step_dump_bytes (const gdb_byte *buf, size_t len) | |
237fc4c9 | 1661 | { |
136821d9 | 1662 | std::string ret; |
237fc4c9 | 1663 | |
136821d9 SM |
1664 | for (size_t i = 0; i < len; i++) |
1665 | { | |
1666 | if (i == 0) | |
1667 | ret += string_printf ("%02x", buf[i]); | |
1668 | else | |
1669 | ret += string_printf (" %02x", buf[i]); | |
1670 | } | |
1671 | ||
1672 | return ret; | |
237fc4c9 PA |
1673 | } |
1674 | ||
1675 | /* Prepare to single-step, using displaced stepping. | |
1676 | ||
1677 | Note that we cannot use displaced stepping when we have a signal to | |
1678 | deliver. If we have a signal to deliver and an instruction to step | |
1679 | over, then after the step, there will be no indication from the | |
1680 | target whether the thread entered a signal handler or ignored the | |
1681 | signal and stepped over the instruction successfully --- both cases | |
1682 | result in a simple SIGTRAP. In the first case we mustn't do a | |
1683 | fixup, and in the second case we must --- but we can't tell which. | |
1684 | Comments in the code for 'random signals' in handle_inferior_event | |
1685 | explain how we handle this case instead. | |
1686 | ||
bab37966 SM |
1687 | Returns DISPLACED_STEP_PREPARE_STATUS_OK if preparing was successful -- this |
1688 | thread is going to be stepped now; DISPLACED_STEP_PREPARE_STATUS_UNAVAILABLE | |
1689 | if displaced stepping this thread got queued; or | |
1690 | DISPLACED_STEP_PREPARE_STATUS_CANT if this instruction can't be displaced | |
1691 | stepped. */ | |
7f03bd92 | 1692 | |
bab37966 | 1693 | static displaced_step_prepare_status |
00431a78 | 1694 | displaced_step_prepare_throw (thread_info *tp) |
237fc4c9 | 1695 | { |
00431a78 | 1696 | regcache *regcache = get_thread_regcache (tp); |
ac7936df | 1697 | struct gdbarch *gdbarch = regcache->arch (); |
187b041e SM |
1698 | displaced_step_thread_state &disp_step_thread_state |
1699 | = tp->displaced_step_state; | |
237fc4c9 PA |
1700 | |
1701 | /* We should never reach this function if the architecture does not | |
1702 | support displaced stepping. */ | |
9822cb57 | 1703 | gdb_assert (gdbarch_supports_displaced_stepping (gdbarch)); |
237fc4c9 | 1704 | |
c2829269 PA |
1705 | /* Nor if the thread isn't meant to step over a breakpoint. */ |
1706 | gdb_assert (tp->control.trap_expected); | |
1707 | ||
c1e36e3e PA |
1708 | /* Disable range stepping while executing in the scratch pad. We |
1709 | want a single-step even if executing the displaced instruction in | |
1710 | the scratch buffer lands within the stepping range (e.g., a | |
1711 | jump/branch). */ | |
1712 | tp->control.may_range_step = 0; | |
1713 | ||
187b041e SM |
1714 | /* We are about to start a displaced step for this thread. If one is already |
1715 | in progress, something's wrong. */ | |
1716 | gdb_assert (!disp_step_thread_state.in_progress ()); | |
237fc4c9 | 1717 | |
187b041e | 1718 | if (tp->inf->displaced_step_state.unavailable) |
237fc4c9 | 1719 | { |
187b041e SM |
1720 | /* The gdbarch tells us it's not worth asking to try a prepare because |
1721 | it is likely that it will return unavailable, so don't bother asking. */ | |
237fc4c9 | 1722 | |
136821d9 | 1723 | displaced_debug_printf ("deferring step of %s", |
0fab7955 | 1724 | tp->ptid.to_string ().c_str ()); |
237fc4c9 | 1725 | |
28d5518b | 1726 | global_thread_step_over_chain_enqueue (tp); |
bab37966 | 1727 | return DISPLACED_STEP_PREPARE_STATUS_UNAVAILABLE; |
237fc4c9 | 1728 | } |
237fc4c9 | 1729 | |
187b041e | 1730 | displaced_debug_printf ("displaced-stepping %s now", |
0fab7955 | 1731 | tp->ptid.to_string ().c_str ()); |
237fc4c9 | 1732 | |
00431a78 PA |
1733 | scoped_restore_current_thread restore_thread; |
1734 | ||
1735 | switch_to_thread (tp); | |
ad53cd71 | 1736 | |
187b041e SM |
1737 | CORE_ADDR original_pc = regcache_read_pc (regcache); |
1738 | CORE_ADDR displaced_pc; | |
237fc4c9 | 1739 | |
187b041e SM |
1740 | displaced_step_prepare_status status |
1741 | = gdbarch_displaced_step_prepare (gdbarch, tp, displaced_pc); | |
237fc4c9 | 1742 | |
187b041e | 1743 | if (status == DISPLACED_STEP_PREPARE_STATUS_CANT) |
d35ae833 | 1744 | { |
187b041e | 1745 | displaced_debug_printf ("failed to prepare (%s)", |
0fab7955 | 1746 | tp->ptid.to_string ().c_str ()); |
d35ae833 | 1747 | |
bab37966 | 1748 | return DISPLACED_STEP_PREPARE_STATUS_CANT; |
d35ae833 | 1749 | } |
187b041e | 1750 | else if (status == DISPLACED_STEP_PREPARE_STATUS_UNAVAILABLE) |
7f03bd92 | 1751 | { |
187b041e SM |
1752 | /* Not enough displaced stepping resources available, defer this |
1753 | request by placing it the queue. */ | |
1754 | ||
1755 | displaced_debug_printf ("not enough resources available, " | |
1756 | "deferring step of %s", | |
0fab7955 | 1757 | tp->ptid.to_string ().c_str ()); |
187b041e SM |
1758 | |
1759 | global_thread_step_over_chain_enqueue (tp); | |
1760 | ||
1761 | return DISPLACED_STEP_PREPARE_STATUS_UNAVAILABLE; | |
7f03bd92 | 1762 | } |
237fc4c9 | 1763 | |
187b041e SM |
1764 | gdb_assert (status == DISPLACED_STEP_PREPARE_STATUS_OK); |
1765 | ||
9f5a595d UW |
1766 | /* Save the information we need to fix things up if the step |
1767 | succeeds. */ | |
187b041e | 1768 | disp_step_thread_state.set (gdbarch); |
9f5a595d | 1769 | |
187b041e | 1770 | tp->inf->displaced_step_state.in_progress_count++; |
ad53cd71 | 1771 | |
187b041e SM |
1772 | displaced_debug_printf ("prepared successfully thread=%s, " |
1773 | "original_pc=%s, displaced_pc=%s", | |
0fab7955 | 1774 | tp->ptid.to_string ().c_str (), |
187b041e SM |
1775 | paddress (gdbarch, original_pc), |
1776 | paddress (gdbarch, displaced_pc)); | |
237fc4c9 | 1777 | |
bab37966 | 1778 | return DISPLACED_STEP_PREPARE_STATUS_OK; |
237fc4c9 PA |
1779 | } |
1780 | ||
3fc8eb30 PA |
1781 | /* Wrapper for displaced_step_prepare_throw that disabled further |
1782 | attempts at displaced stepping if we get a memory error. */ | |
1783 | ||
bab37966 | 1784 | static displaced_step_prepare_status |
00431a78 | 1785 | displaced_step_prepare (thread_info *thread) |
3fc8eb30 | 1786 | { |
bab37966 SM |
1787 | displaced_step_prepare_status status |
1788 | = DISPLACED_STEP_PREPARE_STATUS_CANT; | |
3fc8eb30 | 1789 | |
a70b8144 | 1790 | try |
3fc8eb30 | 1791 | { |
bab37966 | 1792 | status = displaced_step_prepare_throw (thread); |
3fc8eb30 | 1793 | } |
230d2906 | 1794 | catch (const gdb_exception_error &ex) |
3fc8eb30 | 1795 | { |
16b41842 PA |
1796 | if (ex.error != MEMORY_ERROR |
1797 | && ex.error != NOT_SUPPORTED_ERROR) | |
eedc3f4f | 1798 | throw; |
3fc8eb30 | 1799 | |
1eb8556f SM |
1800 | infrun_debug_printf ("caught exception, disabling displaced stepping: %s", |
1801 | ex.what ()); | |
3fc8eb30 PA |
1802 | |
1803 | /* Be verbose if "set displaced-stepping" is "on", silent if | |
1804 | "auto". */ | |
1805 | if (can_use_displaced_stepping == AUTO_BOOLEAN_TRUE) | |
1806 | { | |
fd7dcb94 | 1807 | warning (_("disabling displaced stepping: %s"), |
3d6e9d23 | 1808 | ex.what ()); |
3fc8eb30 PA |
1809 | } |
1810 | ||
1811 | /* Disable further displaced stepping attempts. */ | |
f5f01699 | 1812 | thread->inf->displaced_step_state.failed_before = 1; |
3fc8eb30 | 1813 | } |
3fc8eb30 | 1814 | |
bab37966 | 1815 | return status; |
3fc8eb30 PA |
1816 | } |
1817 | ||
bab37966 SM |
1818 | /* If we displaced stepped an instruction successfully, adjust registers and |
1819 | memory to yield the same effect the instruction would have had if we had | |
1820 | executed it at its original address, and return | |
1821 | DISPLACED_STEP_FINISH_STATUS_OK. If the instruction didn't complete, | |
1822 | relocate the PC and return DISPLACED_STEP_FINISH_STATUS_NOT_EXECUTED. | |
372316f1 | 1823 | |
bab37966 SM |
1824 | If the thread wasn't displaced stepping, return |
1825 | DISPLACED_STEP_FINISH_STATUS_OK as well. */ | |
1826 | ||
1827 | static displaced_step_finish_status | |
7def77a1 | 1828 | displaced_step_finish (thread_info *event_thread, enum gdb_signal signal) |
237fc4c9 | 1829 | { |
187b041e | 1830 | displaced_step_thread_state *displaced = &event_thread->displaced_step_state; |
fc1cf338 | 1831 | |
187b041e SM |
1832 | /* Was this thread performing a displaced step? */ |
1833 | if (!displaced->in_progress ()) | |
bab37966 | 1834 | return DISPLACED_STEP_FINISH_STATUS_OK; |
237fc4c9 | 1835 | |
187b041e SM |
1836 | gdb_assert (event_thread->inf->displaced_step_state.in_progress_count > 0); |
1837 | event_thread->inf->displaced_step_state.in_progress_count--; | |
1838 | ||
cb71640d PA |
1839 | /* Fixup may need to read memory/registers. Switch to the thread |
1840 | that we're fixing up. Also, target_stopped_by_watchpoint checks | |
d43b7a2d | 1841 | the current thread, and displaced_step_restore performs ptid-dependent |
328d42d8 | 1842 | memory accesses using current_inferior(). */ |
00431a78 | 1843 | switch_to_thread (event_thread); |
cb71640d | 1844 | |
d43b7a2d TBA |
1845 | displaced_step_reset_cleanup cleanup (displaced); |
1846 | ||
187b041e SM |
1847 | /* Do the fixup, and release the resources acquired to do the displaced |
1848 | step. */ | |
1849 | return gdbarch_displaced_step_finish (displaced->get_original_gdbarch (), | |
1850 | event_thread, signal); | |
c2829269 | 1851 | } |
1c5cfe86 | 1852 | |
4d9d9d04 PA |
1853 | /* Data to be passed around while handling an event. This data is |
1854 | discarded between events. */ | |
1855 | struct execution_control_state | |
1856 | { | |
aa563d16 TT |
1857 | explicit execution_control_state (thread_info *thr = nullptr) |
1858 | : ptid (thr == nullptr ? null_ptid : thr->ptid), | |
1859 | event_thread (thr) | |
183be222 | 1860 | { |
183be222 SM |
1861 | } |
1862 | ||
aa563d16 | 1863 | process_stratum_target *target = nullptr; |
4d9d9d04 PA |
1864 | ptid_t ptid; |
1865 | /* The thread that got the event, if this was a thread event; NULL | |
1866 | otherwise. */ | |
1867 | struct thread_info *event_thread; | |
1868 | ||
1869 | struct target_waitstatus ws; | |
aa563d16 TT |
1870 | int stop_func_filled_in = 0; |
1871 | CORE_ADDR stop_func_start = 0; | |
1872 | CORE_ADDR stop_func_end = 0; | |
1873 | const char *stop_func_name = nullptr; | |
1874 | int wait_some_more = 0; | |
4d9d9d04 PA |
1875 | |
1876 | /* True if the event thread hit the single-step breakpoint of | |
1877 | another thread. Thus the event doesn't cause a stop, the thread | |
1878 | needs to be single-stepped past the single-step breakpoint before | |
1879 | we can switch back to the original stepping thread. */ | |
aa563d16 | 1880 | int hit_singlestep_breakpoint = 0; |
4d9d9d04 PA |
1881 | }; |
1882 | ||
4d9d9d04 PA |
1883 | static void keep_going_pass_signal (struct execution_control_state *ecs); |
1884 | static void prepare_to_wait (struct execution_control_state *ecs); | |
c4464ade | 1885 | static bool keep_going_stepped_thread (struct thread_info *tp); |
8d297bbf | 1886 | static step_over_what thread_still_needs_step_over (struct thread_info *tp); |
4d9d9d04 PA |
1887 | |
1888 | /* Are there any pending step-over requests? If so, run all we can | |
1889 | now and return true. Otherwise, return false. */ | |
1890 | ||
c4464ade | 1891 | static bool |
c2829269 PA |
1892 | start_step_over (void) |
1893 | { | |
3ec3145c SM |
1894 | INFRUN_SCOPED_DEBUG_ENTER_EXIT; |
1895 | ||
372316f1 PA |
1896 | /* Don't start a new step-over if we already have an in-line |
1897 | step-over operation ongoing. */ | |
1898 | if (step_over_info_valid_p ()) | |
c4464ade | 1899 | return false; |
372316f1 | 1900 | |
187b041e SM |
1901 | /* Steal the global thread step over chain. As we try to initiate displaced |
1902 | steps, threads will be enqueued in the global chain if no buffers are | |
1903 | available. If we iterated on the global chain directly, we might iterate | |
1904 | indefinitely. */ | |
8b6a69b2 SM |
1905 | thread_step_over_list threads_to_step |
1906 | = std::move (global_thread_step_over_list); | |
187b041e SM |
1907 | |
1908 | infrun_debug_printf ("stealing global queue of threads to step, length = %d", | |
1909 | thread_step_over_chain_length (threads_to_step)); | |
1910 | ||
1911 | bool started = false; | |
1912 | ||
1913 | /* On scope exit (whatever the reason, return or exception), if there are | |
1914 | threads left in the THREADS_TO_STEP chain, put back these threads in the | |
1915 | global list. */ | |
1916 | SCOPE_EXIT | |
1917 | { | |
8b6a69b2 | 1918 | if (threads_to_step.empty ()) |
187b041e SM |
1919 | infrun_debug_printf ("step-over queue now empty"); |
1920 | else | |
1921 | { | |
1922 | infrun_debug_printf ("putting back %d threads to step in global queue", | |
1923 | thread_step_over_chain_length (threads_to_step)); | |
1924 | ||
8b6a69b2 SM |
1925 | global_thread_step_over_chain_enqueue_chain |
1926 | (std::move (threads_to_step)); | |
187b041e SM |
1927 | } |
1928 | }; | |
1929 | ||
8b6a69b2 SM |
1930 | thread_step_over_list_safe_range range |
1931 | = make_thread_step_over_list_safe_range (threads_to_step); | |
1932 | ||
1933 | for (thread_info *tp : range) | |
237fc4c9 | 1934 | { |
8d297bbf | 1935 | step_over_what step_what; |
372316f1 | 1936 | int must_be_in_line; |
c2829269 | 1937 | |
c65d6b55 PA |
1938 | gdb_assert (!tp->stop_requested); |
1939 | ||
187b041e SM |
1940 | if (tp->inf->displaced_step_state.unavailable) |
1941 | { | |
1942 | /* The arch told us to not even try preparing another displaced step | |
1943 | for this inferior. Just leave the thread in THREADS_TO_STEP, it | |
1944 | will get moved to the global chain on scope exit. */ | |
1945 | continue; | |
1946 | } | |
1947 | ||
d8bbae6e SM |
1948 | if (tp->inf->thread_waiting_for_vfork_done != nullptr) |
1949 | { | |
1950 | /* When we stop all threads, handling a vfork, any thread in the step | |
1951 | over chain remains there. A user could also try to continue a | |
1952 | thread stopped at a breakpoint while another thread is waiting for | |
1953 | a vfork-done event. In any case, we don't want to start a step | |
1954 | over right now. */ | |
1955 | continue; | |
1956 | } | |
1957 | ||
187b041e SM |
1958 | /* Remove thread from the THREADS_TO_STEP chain. If anything goes wrong |
1959 | while we try to prepare the displaced step, we don't add it back to | |
1960 | the global step over chain. This is to avoid a thread staying in the | |
1961 | step over chain indefinitely if something goes wrong when resuming it | |
1962 | If the error is intermittent and it still needs a step over, it will | |
1963 | get enqueued again when we try to resume it normally. */ | |
8b6a69b2 | 1964 | threads_to_step.erase (threads_to_step.iterator_to (*tp)); |
c2829269 | 1965 | |
372316f1 PA |
1966 | step_what = thread_still_needs_step_over (tp); |
1967 | must_be_in_line = ((step_what & STEP_OVER_WATCHPOINT) | |
1968 | || ((step_what & STEP_OVER_BREAKPOINT) | |
3fc8eb30 | 1969 | && !use_displaced_stepping (tp))); |
372316f1 PA |
1970 | |
1971 | /* We currently stop all threads of all processes to step-over | |
1972 | in-line. If we need to start a new in-line step-over, let | |
1973 | any pending displaced steps finish first. */ | |
187b041e SM |
1974 | if (must_be_in_line && displaced_step_in_progress_any_thread ()) |
1975 | { | |
1976 | global_thread_step_over_chain_enqueue (tp); | |
1977 | continue; | |
1978 | } | |
c2829269 | 1979 | |
372316f1 | 1980 | if (tp->control.trap_expected |
7846f3aa | 1981 | || tp->resumed () |
611841bb | 1982 | || tp->executing ()) |
ad53cd71 | 1983 | { |
f34652de | 1984 | internal_error ("[%s] has inconsistent state: " |
372316f1 | 1985 | "trap_expected=%d, resumed=%d, executing=%d\n", |
0fab7955 | 1986 | tp->ptid.to_string ().c_str (), |
4d9d9d04 | 1987 | tp->control.trap_expected, |
7846f3aa | 1988 | tp->resumed (), |
611841bb | 1989 | tp->executing ()); |
ad53cd71 | 1990 | } |
1c5cfe86 | 1991 | |
1eb8556f | 1992 | infrun_debug_printf ("resuming [%s] for step-over", |
0fab7955 | 1993 | tp->ptid.to_string ().c_str ()); |
4d9d9d04 PA |
1994 | |
1995 | /* keep_going_pass_signal skips the step-over if the breakpoint | |
1996 | is no longer inserted. In all-stop, we want to keep looking | |
1997 | for a thread that needs a step-over instead of resuming TP, | |
1998 | because we wouldn't be able to resume anything else until the | |
1999 | target stops again. In non-stop, the resume always resumes | |
2000 | only TP, so it's OK to let the thread resume freely. */ | |
fbea99ea | 2001 | if (!target_is_non_stop_p () && !step_what) |
4d9d9d04 | 2002 | continue; |
8550d3b3 | 2003 | |
00431a78 | 2004 | switch_to_thread (tp); |
aa563d16 TT |
2005 | execution_control_state ecs (tp); |
2006 | keep_going_pass_signal (&ecs); | |
1c5cfe86 | 2007 | |
aa563d16 | 2008 | if (!ecs.wait_some_more) |
4d9d9d04 | 2009 | error (_("Command aborted.")); |
1c5cfe86 | 2010 | |
187b041e SM |
2011 | /* If the thread's step over could not be initiated because no buffers |
2012 | were available, it was re-added to the global step over chain. */ | |
7846f3aa | 2013 | if (tp->resumed ()) |
187b041e SM |
2014 | { |
2015 | infrun_debug_printf ("[%s] was resumed.", | |
0fab7955 | 2016 | tp->ptid.to_string ().c_str ()); |
187b041e SM |
2017 | gdb_assert (!thread_is_in_step_over_chain (tp)); |
2018 | } | |
2019 | else | |
2020 | { | |
2021 | infrun_debug_printf ("[%s] was NOT resumed.", | |
0fab7955 | 2022 | tp->ptid.to_string ().c_str ()); |
187b041e SM |
2023 | gdb_assert (thread_is_in_step_over_chain (tp)); |
2024 | } | |
372316f1 PA |
2025 | |
2026 | /* If we started a new in-line step-over, we're done. */ | |
2027 | if (step_over_info_valid_p ()) | |
2028 | { | |
2029 | gdb_assert (tp->control.trap_expected); | |
187b041e SM |
2030 | started = true; |
2031 | break; | |
372316f1 PA |
2032 | } |
2033 | ||
fbea99ea | 2034 | if (!target_is_non_stop_p ()) |
4d9d9d04 PA |
2035 | { |
2036 | /* On all-stop, shouldn't have resumed unless we needed a | |
2037 | step over. */ | |
2038 | gdb_assert (tp->control.trap_expected | |
2039 | || tp->step_after_step_resume_breakpoint); | |
2040 | ||
2041 | /* With remote targets (at least), in all-stop, we can't | |
2042 | issue any further remote commands until the program stops | |
2043 | again. */ | |
187b041e SM |
2044 | started = true; |
2045 | break; | |
1c5cfe86 | 2046 | } |
c2829269 | 2047 | |
4d9d9d04 PA |
2048 | /* Either the thread no longer needed a step-over, or a new |
2049 | displaced stepping sequence started. Even in the latter | |
2050 | case, continue looking. Maybe we can also start another | |
2051 | displaced step on a thread of other process. */ | |
237fc4c9 | 2052 | } |
4d9d9d04 | 2053 | |
187b041e | 2054 | return started; |
237fc4c9 PA |
2055 | } |
2056 | ||
5231c1fd PA |
2057 | /* Update global variables holding ptids to hold NEW_PTID if they were |
2058 | holding OLD_PTID. */ | |
2059 | static void | |
b161a60d SM |
2060 | infrun_thread_ptid_changed (process_stratum_target *target, |
2061 | ptid_t old_ptid, ptid_t new_ptid) | |
5231c1fd | 2062 | { |
b161a60d SM |
2063 | if (inferior_ptid == old_ptid |
2064 | && current_inferior ()->process_target () == target) | |
5231c1fd | 2065 | inferior_ptid = new_ptid; |
5231c1fd PA |
2066 | } |
2067 | ||
237fc4c9 | 2068 | \f |
c906108c | 2069 | |
53904c9e AC |
2070 | static const char schedlock_off[] = "off"; |
2071 | static const char schedlock_on[] = "on"; | |
2072 | static const char schedlock_step[] = "step"; | |
f2665db5 | 2073 | static const char schedlock_replay[] = "replay"; |
40478521 | 2074 | static const char *const scheduler_enums[] = { |
ef346e04 AC |
2075 | schedlock_off, |
2076 | schedlock_on, | |
2077 | schedlock_step, | |
f2665db5 | 2078 | schedlock_replay, |
03acd4d8 | 2079 | nullptr |
ef346e04 | 2080 | }; |
f2665db5 | 2081 | static const char *scheduler_mode = schedlock_replay; |
920d2a44 AC |
2082 | static void |
2083 | show_scheduler_mode (struct ui_file *file, int from_tty, | |
2084 | struct cmd_list_element *c, const char *value) | |
2085 | { | |
6cb06a8c TT |
2086 | gdb_printf (file, |
2087 | _("Mode for locking scheduler " | |
2088 | "during execution is \"%s\".\n"), | |
2089 | value); | |
920d2a44 | 2090 | } |
c906108c SS |
2091 | |
2092 | static void | |
eb4c3f4a | 2093 | set_schedlock_func (const char *args, int from_tty, struct cmd_list_element *c) |
c906108c | 2094 | { |
8a3ecb79 | 2095 | if (!target_can_lock_scheduler ()) |
eefe576e AC |
2096 | { |
2097 | scheduler_mode = schedlock_off; | |
d777bf0d SM |
2098 | error (_("Target '%s' cannot support this command."), |
2099 | target_shortname ()); | |
eefe576e | 2100 | } |
c906108c SS |
2101 | } |
2102 | ||
d4db2f36 PA |
2103 | /* True if execution commands resume all threads of all processes by |
2104 | default; otherwise, resume only threads of the current inferior | |
2105 | process. */ | |
491144b5 | 2106 | bool sched_multi = false; |
d4db2f36 | 2107 | |
22b11ba9 LS |
2108 | /* Try to setup for software single stepping. Return true if target_resume() |
2109 | should use hardware single step. | |
2facfe5c | 2110 | |
22b11ba9 | 2111 | GDBARCH the current gdbarch. */ |
2facfe5c | 2112 | |
c4464ade | 2113 | static bool |
22b11ba9 | 2114 | maybe_software_singlestep (struct gdbarch *gdbarch) |
2facfe5c | 2115 | { |
c4464ade | 2116 | bool hw_step = true; |
2facfe5c | 2117 | |
f02253f1 | 2118 | if (execution_direction == EXEC_FORWARD |
93f9a11f YQ |
2119 | && gdbarch_software_single_step_p (gdbarch)) |
2120 | hw_step = !insert_single_step_breakpoints (gdbarch); | |
2121 | ||
2facfe5c DD |
2122 | return hw_step; |
2123 | } | |
c906108c | 2124 | |
f3263aa4 PA |
2125 | /* See infrun.h. */ |
2126 | ||
09cee04b PA |
2127 | ptid_t |
2128 | user_visible_resume_ptid (int step) | |
2129 | { | |
f3263aa4 | 2130 | ptid_t resume_ptid; |
09cee04b | 2131 | |
09cee04b PA |
2132 | if (non_stop) |
2133 | { | |
2134 | /* With non-stop mode on, threads are always handled | |
2135 | individually. */ | |
2136 | resume_ptid = inferior_ptid; | |
2137 | } | |
2138 | else if ((scheduler_mode == schedlock_on) | |
03d46957 | 2139 | || (scheduler_mode == schedlock_step && step)) |
09cee04b | 2140 | { |
f3263aa4 PA |
2141 | /* User-settable 'scheduler' mode requires solo thread |
2142 | resume. */ | |
09cee04b PA |
2143 | resume_ptid = inferior_ptid; |
2144 | } | |
f2665db5 MM |
2145 | else if ((scheduler_mode == schedlock_replay) |
2146 | && target_record_will_replay (minus_one_ptid, execution_direction)) | |
2147 | { | |
2148 | /* User-settable 'scheduler' mode requires solo thread resume in replay | |
2149 | mode. */ | |
2150 | resume_ptid = inferior_ptid; | |
2151 | } | |
f3263aa4 PA |
2152 | else if (!sched_multi && target_supports_multi_process ()) |
2153 | { | |
2154 | /* Resume all threads of the current process (and none of other | |
2155 | processes). */ | |
e99b03dc | 2156 | resume_ptid = ptid_t (inferior_ptid.pid ()); |
f3263aa4 PA |
2157 | } |
2158 | else | |
2159 | { | |
2160 | /* Resume all threads of all processes. */ | |
2161 | resume_ptid = RESUME_ALL; | |
2162 | } | |
09cee04b PA |
2163 | |
2164 | return resume_ptid; | |
2165 | } | |
2166 | ||
5b6d1e4f PA |
2167 | /* See infrun.h. */ |
2168 | ||
2169 | process_stratum_target * | |
2170 | user_visible_resume_target (ptid_t resume_ptid) | |
2171 | { | |
2172 | return (resume_ptid == minus_one_ptid && sched_multi | |
03acd4d8 | 2173 | ? nullptr |
5b6d1e4f PA |
2174 | : current_inferior ()->process_target ()); |
2175 | } | |
2176 | ||
fbea99ea PA |
2177 | /* Return a ptid representing the set of threads that we will resume, |
2178 | in the perspective of the target, assuming run control handling | |
2179 | does not require leaving some threads stopped (e.g., stepping past | |
2180 | breakpoint). USER_STEP indicates whether we're about to start the | |
2181 | target for a stepping command. */ | |
2182 | ||
2183 | static ptid_t | |
2184 | internal_resume_ptid (int user_step) | |
2185 | { | |
2186 | /* In non-stop, we always control threads individually. Note that | |
2187 | the target may always work in non-stop mode even with "set | |
2188 | non-stop off", in which case user_visible_resume_ptid could | |
2189 | return a wildcard ptid. */ | |
2190 | if (target_is_non_stop_p ()) | |
2191 | return inferior_ptid; | |
d8bbae6e SM |
2192 | |
2193 | /* The rest of the function assumes non-stop==off and | |
2194 | target-non-stop==off. | |
2195 | ||
2196 | If a thread is waiting for a vfork-done event, it means breakpoints are out | |
2197 | for this inferior (well, program space in fact). We don't want to resume | |
2198 | any thread other than the one waiting for vfork done, otherwise these other | |
2199 | threads could miss breakpoints. So if a thread in the resumption set is | |
2200 | waiting for a vfork-done event, resume only that thread. | |
2201 | ||
2202 | The resumption set width depends on whether schedule-multiple is on or off. | |
2203 | ||
2204 | Note that if the target_resume interface was more flexible, we could be | |
2205 | smarter here when schedule-multiple is on. For example, imagine 3 | |
2206 | inferiors with 2 threads each (1.1, 1.2, 2.1, 2.2, 3.1 and 3.2). Threads | |
2207 | 2.1 and 3.2 are both waiting for a vfork-done event. Then we could ask the | |
2208 | target(s) to resume: | |
2209 | ||
2210 | - All threads of inferior 1 | |
2211 | - Thread 2.1 | |
2212 | - Thread 3.2 | |
2213 | ||
2214 | Since we don't have that flexibility (we can only pass one ptid), just | |
2215 | resume the first thread waiting for a vfork-done event we find (e.g. thread | |
2216 | 2.1). */ | |
2217 | if (sched_multi) | |
2218 | { | |
2219 | for (inferior *inf : all_non_exited_inferiors ()) | |
2220 | if (inf->thread_waiting_for_vfork_done != nullptr) | |
2221 | return inf->thread_waiting_for_vfork_done->ptid; | |
2222 | } | |
2223 | else if (current_inferior ()->thread_waiting_for_vfork_done != nullptr) | |
2224 | return current_inferior ()->thread_waiting_for_vfork_done->ptid; | |
2225 | ||
2226 | return user_visible_resume_ptid (user_step); | |
fbea99ea PA |
2227 | } |
2228 | ||
64ce06e4 PA |
2229 | /* Wrapper for target_resume, that handles infrun-specific |
2230 | bookkeeping. */ | |
2231 | ||
2232 | static void | |
c4464ade | 2233 | do_target_resume (ptid_t resume_ptid, bool step, enum gdb_signal sig) |
64ce06e4 PA |
2234 | { |
2235 | struct thread_info *tp = inferior_thread (); | |
2236 | ||
c65d6b55 PA |
2237 | gdb_assert (!tp->stop_requested); |
2238 | ||
64ce06e4 | 2239 | /* Install inferior's terminal modes. */ |
223ffa71 | 2240 | target_terminal::inferior (); |
64ce06e4 PA |
2241 | |
2242 | /* Avoid confusing the next resume, if the next stop/resume | |
2243 | happens to apply to another thread. */ | |
1edb66d8 | 2244 | tp->set_stop_signal (GDB_SIGNAL_0); |
64ce06e4 | 2245 | |
8f572e5c PA |
2246 | /* Advise target which signals may be handled silently. |
2247 | ||
2248 | If we have removed breakpoints because we are stepping over one | |
2249 | in-line (in any thread), we need to receive all signals to avoid | |
2250 | accidentally skipping a breakpoint during execution of a signal | |
2251 | handler. | |
2252 | ||
2253 | Likewise if we're displaced stepping, otherwise a trap for a | |
2254 | breakpoint in a signal handler might be confused with the | |
7def77a1 | 2255 | displaced step finishing. We don't make the displaced_step_finish |
8f572e5c PA |
2256 | step distinguish the cases instead, because: |
2257 | ||
2258 | - a backtrace while stopped in the signal handler would show the | |
2259 | scratch pad as frame older than the signal handler, instead of | |
2260 | the real mainline code. | |
2261 | ||
2262 | - when the thread is later resumed, the signal handler would | |
2263 | return to the scratch pad area, which would no longer be | |
2264 | valid. */ | |
2265 | if (step_over_info_valid_p () | |
00431a78 | 2266 | || displaced_step_in_progress (tp->inf)) |
adc6a863 | 2267 | target_pass_signals ({}); |
64ce06e4 | 2268 | else |
adc6a863 | 2269 | target_pass_signals (signal_pass); |
64ce06e4 | 2270 | |
05d65a7a SM |
2271 | infrun_debug_printf ("resume_ptid=%s, step=%d, sig=%s", |
2272 | resume_ptid.to_string ().c_str (), | |
2273 | step, gdb_signal_to_symbol_string (sig)); | |
2274 | ||
64ce06e4 PA |
2275 | target_resume (resume_ptid, step, sig); |
2276 | } | |
2277 | ||
d930703d | 2278 | /* Resume the inferior. SIG is the signal to give the inferior |
71d378ae PA |
2279 | (GDB_SIGNAL_0 for none). Note: don't call this directly; instead |
2280 | call 'resume', which handles exceptions. */ | |
c906108c | 2281 | |
71d378ae PA |
2282 | static void |
2283 | resume_1 (enum gdb_signal sig) | |
c906108c | 2284 | { |
515630c5 | 2285 | struct regcache *regcache = get_current_regcache (); |
ac7936df | 2286 | struct gdbarch *gdbarch = regcache->arch (); |
4e1c45ea | 2287 | struct thread_info *tp = inferior_thread (); |
8b86c959 | 2288 | const address_space *aspace = regcache->aspace (); |
b0f16a3e | 2289 | ptid_t resume_ptid; |
856e7dd6 PA |
2290 | /* This represents the user's step vs continue request. When |
2291 | deciding whether "set scheduler-locking step" applies, it's the | |
2292 | user's intention that counts. */ | |
2293 | const int user_step = tp->control.stepping_command; | |
64ce06e4 PA |
2294 | /* This represents what we'll actually request the target to do. |
2295 | This can decay from a step to a continue, if e.g., we need to | |
2296 | implement single-stepping with breakpoints (software | |
2297 | single-step). */ | |
c4464ade | 2298 | bool step; |
c7e8a53c | 2299 | |
c65d6b55 | 2300 | gdb_assert (!tp->stop_requested); |
c2829269 PA |
2301 | gdb_assert (!thread_is_in_step_over_chain (tp)); |
2302 | ||
1edb66d8 | 2303 | if (tp->has_pending_waitstatus ()) |
372316f1 | 2304 | { |
1eb8556f SM |
2305 | infrun_debug_printf |
2306 | ("thread %s has pending wait " | |
2307 | "status %s (currently_stepping=%d).", | |
0fab7955 | 2308 | tp->ptid.to_string ().c_str (), |
7dca2ea7 | 2309 | tp->pending_waitstatus ().to_string ().c_str (), |
1eb8556f | 2310 | currently_stepping (tp)); |
372316f1 | 2311 | |
5b6d1e4f | 2312 | tp->inf->process_target ()->threads_executing = true; |
7846f3aa | 2313 | tp->set_resumed (true); |
372316f1 PA |
2314 | |
2315 | /* FIXME: What should we do if we are supposed to resume this | |
2316 | thread with a signal? Maybe we should maintain a queue of | |
2317 | pending signals to deliver. */ | |
2318 | if (sig != GDB_SIGNAL_0) | |
2319 | { | |
fd7dcb94 | 2320 | warning (_("Couldn't deliver signal %s to %s."), |
a068643d | 2321 | gdb_signal_to_name (sig), |
0fab7955 | 2322 | tp->ptid.to_string ().c_str ()); |
372316f1 PA |
2323 | } |
2324 | ||
1edb66d8 | 2325 | tp->set_stop_signal (GDB_SIGNAL_0); |
372316f1 PA |
2326 | |
2327 | if (target_can_async_p ()) | |
9516f85a | 2328 | { |
4a570176 | 2329 | target_async (true); |
9516f85a AB |
2330 | /* Tell the event loop we have an event to process. */ |
2331 | mark_async_event_handler (infrun_async_inferior_event_token); | |
2332 | } | |
372316f1 PA |
2333 | return; |
2334 | } | |
2335 | ||
2336 | tp->stepped_breakpoint = 0; | |
2337 | ||
6b403daa PA |
2338 | /* Depends on stepped_breakpoint. */ |
2339 | step = currently_stepping (tp); | |
2340 | ||
6f5d514f | 2341 | if (current_inferior ()->thread_waiting_for_vfork_done != nullptr) |
74609e71 | 2342 | { |
48f9886d PA |
2343 | /* Don't try to single-step a vfork parent that is waiting for |
2344 | the child to get out of the shared memory region (by exec'ing | |
2345 | or exiting). This is particularly important on software | |
2346 | single-step archs, as the child process would trip on the | |
2347 | software single step breakpoint inserted for the parent | |
2348 | process. Since the parent will not actually execute any | |
2349 | instruction until the child is out of the shared region (such | |
2350 | are vfork's semantics), it is safe to simply continue it. | |
2351 | Eventually, we'll see a TARGET_WAITKIND_VFORK_DONE event for | |
2352 | the parent, and tell it to `keep_going', which automatically | |
2353 | re-sets it stepping. */ | |
1eb8556f | 2354 | infrun_debug_printf ("resume : clear step"); |
c4464ade | 2355 | step = false; |
74609e71 YQ |
2356 | } |
2357 | ||
7ca9b62a TBA |
2358 | CORE_ADDR pc = regcache_read_pc (regcache); |
2359 | ||
1eb8556f SM |
2360 | infrun_debug_printf ("step=%d, signal=%s, trap_expected=%d, " |
2361 | "current thread [%s] at %s", | |
2362 | step, gdb_signal_to_symbol_string (sig), | |
2363 | tp->control.trap_expected, | |
0fab7955 | 2364 | inferior_ptid.to_string ().c_str (), |
1eb8556f | 2365 | paddress (gdbarch, pc)); |
c906108c | 2366 | |
c2c6d25f JM |
2367 | /* Normally, by the time we reach `resume', the breakpoints are either |
2368 | removed or inserted, as appropriate. The exception is if we're sitting | |
2369 | at a permanent breakpoint; we need to step over it, but permanent | |
2370 | breakpoints can't be removed. So we have to test for it here. */ | |
6c95b8df | 2371 | if (breakpoint_here_p (aspace, pc) == permanent_breakpoint_here) |
6d350bb5 | 2372 | { |
af48d08f PA |
2373 | if (sig != GDB_SIGNAL_0) |
2374 | { | |
2375 | /* We have a signal to pass to the inferior. The resume | |
2376 | may, or may not take us to the signal handler. If this | |
2377 | is a step, we'll need to stop in the signal handler, if | |
2378 | there's one, (if the target supports stepping into | |
2379 | handlers), or in the next mainline instruction, if | |
2380 | there's no handler. If this is a continue, we need to be | |
2381 | sure to run the handler with all breakpoints inserted. | |
2382 | In all cases, set a breakpoint at the current address | |
2383 | (where the handler returns to), and once that breakpoint | |
2384 | is hit, resume skipping the permanent breakpoint. If | |
2385 | that breakpoint isn't hit, then we've stepped into the | |
2386 | signal handler (or hit some other event). We'll delete | |
2387 | the step-resume breakpoint then. */ | |
2388 | ||
1eb8556f SM |
2389 | infrun_debug_printf ("resume: skipping permanent breakpoint, " |
2390 | "deliver signal first"); | |
af48d08f PA |
2391 | |
2392 | clear_step_over_info (); | |
2393 | tp->control.trap_expected = 0; | |
2394 | ||
03acd4d8 | 2395 | if (tp->control.step_resume_breakpoint == nullptr) |
af48d08f PA |
2396 | { |
2397 | /* Set a "high-priority" step-resume, as we don't want | |
2398 | user breakpoints at PC to trigger (again) when this | |
2399 | hits. */ | |
2400 | insert_hp_step_resume_breakpoint_at_frame (get_current_frame ()); | |
2401 | gdb_assert (tp->control.step_resume_breakpoint->loc->permanent); | |
2402 | ||
2403 | tp->step_after_step_resume_breakpoint = step; | |
2404 | } | |
2405 | ||
2406 | insert_breakpoints (); | |
2407 | } | |
2408 | else | |
2409 | { | |
2410 | /* There's no signal to pass, we can go ahead and skip the | |
2411 | permanent breakpoint manually. */ | |
1eb8556f | 2412 | infrun_debug_printf ("skipping permanent breakpoint"); |
af48d08f PA |
2413 | gdbarch_skip_permanent_breakpoint (gdbarch, regcache); |
2414 | /* Update pc to reflect the new address from which we will | |
2415 | execute instructions. */ | |
2416 | pc = regcache_read_pc (regcache); | |
2417 | ||
2418 | if (step) | |
2419 | { | |
2420 | /* We've already advanced the PC, so the stepping part | |
2421 | is done. Now we need to arrange for a trap to be | |
2422 | reported to handle_inferior_event. Set a breakpoint | |
2423 | at the current PC, and run to it. Don't update | |
2424 | prev_pc, because if we end in | |
44a1ee51 PA |
2425 | switch_back_to_stepped_thread, we want the "expected |
2426 | thread advanced also" branch to be taken. IOW, we | |
2427 | don't want this thread to step further from PC | |
af48d08f | 2428 | (overstep). */ |
1ac806b8 | 2429 | gdb_assert (!step_over_info_valid_p ()); |
af48d08f PA |
2430 | insert_single_step_breakpoint (gdbarch, aspace, pc); |
2431 | insert_breakpoints (); | |
2432 | ||
fbea99ea | 2433 | resume_ptid = internal_resume_ptid (user_step); |
c4464ade | 2434 | do_target_resume (resume_ptid, false, GDB_SIGNAL_0); |
7846f3aa | 2435 | tp->set_resumed (true); |
af48d08f PA |
2436 | return; |
2437 | } | |
2438 | } | |
6d350bb5 | 2439 | } |
c2c6d25f | 2440 | |
c1e36e3e PA |
2441 | /* If we have a breakpoint to step over, make sure to do a single |
2442 | step only. Same if we have software watchpoints. */ | |
2443 | if (tp->control.trap_expected || bpstat_should_step ()) | |
2444 | tp->control.may_range_step = 0; | |
2445 | ||
7da6a5b9 LM |
2446 | /* If displaced stepping is enabled, step over breakpoints by executing a |
2447 | copy of the instruction at a different address. | |
237fc4c9 PA |
2448 | |
2449 | We can't use displaced stepping when we have a signal to deliver; | |
2450 | the comments for displaced_step_prepare explain why. The | |
2451 | comments in the handle_inferior event for dealing with 'random | |
74609e71 YQ |
2452 | signals' explain what we do instead. |
2453 | ||
2454 | We can't use displaced stepping when we are waiting for vfork_done | |
2455 | event, displaced stepping breaks the vfork child similarly as single | |
2456 | step software breakpoint. */ | |
3fc8eb30 PA |
2457 | if (tp->control.trap_expected |
2458 | && use_displaced_stepping (tp) | |
cb71640d | 2459 | && !step_over_info_valid_p () |
a493e3e2 | 2460 | && sig == GDB_SIGNAL_0 |
6f5d514f | 2461 | && current_inferior ()->thread_waiting_for_vfork_done == nullptr) |
237fc4c9 | 2462 | { |
bab37966 SM |
2463 | displaced_step_prepare_status prepare_status |
2464 | = displaced_step_prepare (tp); | |
fc1cf338 | 2465 | |
bab37966 | 2466 | if (prepare_status == DISPLACED_STEP_PREPARE_STATUS_UNAVAILABLE) |
d56b7306 | 2467 | { |
1eb8556f | 2468 | infrun_debug_printf ("Got placed in step-over queue"); |
4d9d9d04 PA |
2469 | |
2470 | tp->control.trap_expected = 0; | |
d56b7306 VP |
2471 | return; |
2472 | } | |
bab37966 | 2473 | else if (prepare_status == DISPLACED_STEP_PREPARE_STATUS_CANT) |
3fc8eb30 PA |
2474 | { |
2475 | /* Fallback to stepping over the breakpoint in-line. */ | |
2476 | ||
2477 | if (target_is_non_stop_p ()) | |
4f5539f0 | 2478 | stop_all_threads ("displaced stepping falling back on inline stepping"); |
3fc8eb30 | 2479 | |
a01bda52 | 2480 | set_step_over_info (regcache->aspace (), |
21edc42f | 2481 | regcache_read_pc (regcache), 0, tp->global_num); |
3fc8eb30 | 2482 | |
22b11ba9 | 2483 | step = maybe_software_singlestep (gdbarch); |
3fc8eb30 PA |
2484 | |
2485 | insert_breakpoints (); | |
2486 | } | |
bab37966 | 2487 | else if (prepare_status == DISPLACED_STEP_PREPARE_STATUS_OK) |
3fc8eb30 | 2488 | { |
3fc8eb30 PA |
2489 | /* Update pc to reflect the new address from which we will |
2490 | execute instructions due to displaced stepping. */ | |
00431a78 | 2491 | pc = regcache_read_pc (get_thread_regcache (tp)); |
ca7781d2 | 2492 | |
40a53766 | 2493 | step = gdbarch_displaced_step_hw_singlestep (gdbarch); |
3fc8eb30 | 2494 | } |
bab37966 | 2495 | else |
557b4d76 SM |
2496 | gdb_assert_not_reached ("Invalid displaced_step_prepare_status " |
2497 | "value."); | |
237fc4c9 PA |
2498 | } |
2499 | ||
2facfe5c | 2500 | /* Do we need to do it the hard way, w/temp breakpoints? */ |
99e40580 | 2501 | else if (step) |
22b11ba9 | 2502 | step = maybe_software_singlestep (gdbarch); |
c906108c | 2503 | |
30852783 UW |
2504 | /* Currently, our software single-step implementation leads to different |
2505 | results than hardware single-stepping in one situation: when stepping | |
2506 | into delivering a signal which has an associated signal handler, | |
2507 | hardware single-step will stop at the first instruction of the handler, | |
2508 | while software single-step will simply skip execution of the handler. | |
2509 | ||
2510 | For now, this difference in behavior is accepted since there is no | |
2511 | easy way to actually implement single-stepping into a signal handler | |
2512 | without kernel support. | |
2513 | ||
2514 | However, there is one scenario where this difference leads to follow-on | |
2515 | problems: if we're stepping off a breakpoint by removing all breakpoints | |
2516 | and then single-stepping. In this case, the software single-step | |
2517 | behavior means that even if there is a *breakpoint* in the signal | |
2518 | handler, GDB still would not stop. | |
2519 | ||
2520 | Fortunately, we can at least fix this particular issue. We detect | |
2521 | here the case where we are about to deliver a signal while software | |
2522 | single-stepping with breakpoints removed. In this situation, we | |
2523 | revert the decisions to remove all breakpoints and insert single- | |
2524 | step breakpoints, and instead we install a step-resume breakpoint | |
2525 | at the current address, deliver the signal without stepping, and | |
2526 | once we arrive back at the step-resume breakpoint, actually step | |
2527 | over the breakpoint we originally wanted to step over. */ | |
34b7e8a6 | 2528 | if (thread_has_single_step_breakpoints_set (tp) |
6cc83d2a PA |
2529 | && sig != GDB_SIGNAL_0 |
2530 | && step_over_info_valid_p ()) | |
30852783 UW |
2531 | { |
2532 | /* If we have nested signals or a pending signal is delivered | |
7da6a5b9 | 2533 | immediately after a handler returns, might already have |
30852783 UW |
2534 | a step-resume breakpoint set on the earlier handler. We cannot |
2535 | set another step-resume breakpoint; just continue on until the | |
2536 | original breakpoint is hit. */ | |
03acd4d8 | 2537 | if (tp->control.step_resume_breakpoint == nullptr) |
30852783 | 2538 | { |
2c03e5be | 2539 | insert_hp_step_resume_breakpoint_at_frame (get_current_frame ()); |
30852783 UW |
2540 | tp->step_after_step_resume_breakpoint = 1; |
2541 | } | |
2542 | ||
34b7e8a6 | 2543 | delete_single_step_breakpoints (tp); |
30852783 | 2544 | |
31e77af2 | 2545 | clear_step_over_info (); |
30852783 | 2546 | tp->control.trap_expected = 0; |
31e77af2 PA |
2547 | |
2548 | insert_breakpoints (); | |
30852783 UW |
2549 | } |
2550 | ||
b0f16a3e SM |
2551 | /* If STEP is set, it's a request to use hardware stepping |
2552 | facilities. But in that case, we should never | |
2553 | use singlestep breakpoint. */ | |
34b7e8a6 | 2554 | gdb_assert (!(thread_has_single_step_breakpoints_set (tp) && step)); |
dfcd3bfb | 2555 | |
fbea99ea | 2556 | /* Decide the set of threads to ask the target to resume. */ |
1946c4cc | 2557 | if (tp->control.trap_expected) |
b0f16a3e SM |
2558 | { |
2559 | /* We're allowing a thread to run past a breakpoint it has | |
1946c4cc YQ |
2560 | hit, either by single-stepping the thread with the breakpoint |
2561 | removed, or by displaced stepping, with the breakpoint inserted. | |
2562 | In the former case, we need to single-step only this thread, | |
2563 | and keep others stopped, as they can miss this breakpoint if | |
2564 | allowed to run. That's not really a problem for displaced | |
2565 | stepping, but, we still keep other threads stopped, in case | |
2566 | another thread is also stopped for a breakpoint waiting for | |
2567 | its turn in the displaced stepping queue. */ | |
b0f16a3e SM |
2568 | resume_ptid = inferior_ptid; |
2569 | } | |
fbea99ea PA |
2570 | else |
2571 | resume_ptid = internal_resume_ptid (user_step); | |
d4db2f36 | 2572 | |
7f5ef605 PA |
2573 | if (execution_direction != EXEC_REVERSE |
2574 | && step && breakpoint_inserted_here_p (aspace, pc)) | |
b0f16a3e | 2575 | { |
372316f1 PA |
2576 | /* There are two cases where we currently need to step a |
2577 | breakpoint instruction when we have a signal to deliver: | |
2578 | ||
2579 | - See handle_signal_stop where we handle random signals that | |
2580 | could take out us out of the stepping range. Normally, in | |
2581 | that case we end up continuing (instead of stepping) over the | |
7f5ef605 PA |
2582 | signal handler with a breakpoint at PC, but there are cases |
2583 | where we should _always_ single-step, even if we have a | |
2584 | step-resume breakpoint, like when a software watchpoint is | |
2585 | set. Assuming single-stepping and delivering a signal at the | |
2586 | same time would takes us to the signal handler, then we could | |
2587 | have removed the breakpoint at PC to step over it. However, | |
2588 | some hardware step targets (like e.g., Mac OS) can't step | |
2589 | into signal handlers, and for those, we need to leave the | |
2590 | breakpoint at PC inserted, as otherwise if the handler | |
2591 | recurses and executes PC again, it'll miss the breakpoint. | |
2592 | So we leave the breakpoint inserted anyway, but we need to | |
2593 | record that we tried to step a breakpoint instruction, so | |
372316f1 PA |
2594 | that adjust_pc_after_break doesn't end up confused. |
2595 | ||
dda83cd7 | 2596 | - In non-stop if we insert a breakpoint (e.g., a step-resume) |
372316f1 PA |
2597 | in one thread after another thread that was stepping had been |
2598 | momentarily paused for a step-over. When we re-resume the | |
2599 | stepping thread, it may be resumed from that address with a | |
2600 | breakpoint that hasn't trapped yet. Seen with | |
2601 | gdb.threads/non-stop-fair-events.exp, on targets that don't | |
2602 | do displaced stepping. */ | |
2603 | ||
1eb8556f | 2604 | infrun_debug_printf ("resume: [%s] stepped breakpoint", |
0fab7955 | 2605 | tp->ptid.to_string ().c_str ()); |
7f5ef605 PA |
2606 | |
2607 | tp->stepped_breakpoint = 1; | |
2608 | ||
b0f16a3e SM |
2609 | /* Most targets can step a breakpoint instruction, thus |
2610 | executing it normally. But if this one cannot, just | |
2611 | continue and we will hit it anyway. */ | |
7f5ef605 | 2612 | if (gdbarch_cannot_step_breakpoint (gdbarch)) |
c4464ade | 2613 | step = false; |
b0f16a3e | 2614 | } |
ef5cf84e | 2615 | |
b0f16a3e | 2616 | if (debug_displaced |
cb71640d | 2617 | && tp->control.trap_expected |
3fc8eb30 | 2618 | && use_displaced_stepping (tp) |
cb71640d | 2619 | && !step_over_info_valid_p ()) |
b0f16a3e | 2620 | { |
00431a78 | 2621 | struct regcache *resume_regcache = get_thread_regcache (tp); |
ac7936df | 2622 | struct gdbarch *resume_gdbarch = resume_regcache->arch (); |
b0f16a3e SM |
2623 | CORE_ADDR actual_pc = regcache_read_pc (resume_regcache); |
2624 | gdb_byte buf[4]; | |
2625 | ||
b0f16a3e | 2626 | read_memory (actual_pc, buf, sizeof (buf)); |
136821d9 SM |
2627 | displaced_debug_printf ("run %s: %s", |
2628 | paddress (resume_gdbarch, actual_pc), | |
2629 | displaced_step_dump_bytes | |
2630 | (buf, sizeof (buf)).c_str ()); | |
b0f16a3e | 2631 | } |
237fc4c9 | 2632 | |
b0f16a3e SM |
2633 | if (tp->control.may_range_step) |
2634 | { | |
2635 | /* If we're resuming a thread with the PC out of the step | |
2636 | range, then we're doing some nested/finer run control | |
2637 | operation, like stepping the thread out of the dynamic | |
2638 | linker or the displaced stepping scratch pad. We | |
2639 | shouldn't have allowed a range step then. */ | |
2640 | gdb_assert (pc_in_thread_step_range (pc, tp)); | |
2641 | } | |
c1e36e3e | 2642 | |
64ce06e4 | 2643 | do_target_resume (resume_ptid, step, sig); |
7846f3aa | 2644 | tp->set_resumed (true); |
c906108c | 2645 | } |
71d378ae PA |
2646 | |
2647 | /* Resume the inferior. SIG is the signal to give the inferior | |
2648 | (GDB_SIGNAL_0 for none). This is a wrapper around 'resume_1' that | |
2649 | rolls back state on error. */ | |
2650 | ||
aff4e175 | 2651 | static void |
71d378ae PA |
2652 | resume (gdb_signal sig) |
2653 | { | |
a70b8144 | 2654 | try |
71d378ae PA |
2655 | { |
2656 | resume_1 (sig); | |
2657 | } | |
230d2906 | 2658 | catch (const gdb_exception &ex) |
71d378ae PA |
2659 | { |
2660 | /* If resuming is being aborted for any reason, delete any | |
2661 | single-step breakpoint resume_1 may have created, to avoid | |
2662 | confusing the following resumption, and to avoid leaving | |
2663 | single-step breakpoints perturbing other threads, in case | |
2664 | we're running in non-stop mode. */ | |
2665 | if (inferior_ptid != null_ptid) | |
2666 | delete_single_step_breakpoints (inferior_thread ()); | |
eedc3f4f | 2667 | throw; |
71d378ae | 2668 | } |
71d378ae PA |
2669 | } |
2670 | ||
c906108c | 2671 | \f |
237fc4c9 | 2672 | /* Proceeding. */ |
c906108c | 2673 | |
4c2f2a79 PA |
2674 | /* See infrun.h. */ |
2675 | ||
2676 | /* Counter that tracks number of user visible stops. This can be used | |
2677 | to tell whether a command has proceeded the inferior past the | |
2678 | current location. This allows e.g., inferior function calls in | |
2679 | breakpoint commands to not interrupt the command list. When the | |
2680 | call finishes successfully, the inferior is standing at the same | |
2681 | breakpoint as if nothing happened (and so we don't call | |
2682 | normal_stop). */ | |
2683 | static ULONGEST current_stop_id; | |
2684 | ||
2685 | /* See infrun.h. */ | |
2686 | ||
2687 | ULONGEST | |
2688 | get_stop_id (void) | |
2689 | { | |
2690 | return current_stop_id; | |
2691 | } | |
2692 | ||
2693 | /* Called when we report a user visible stop. */ | |
2694 | ||
2695 | static void | |
2696 | new_stop_id (void) | |
2697 | { | |
2698 | current_stop_id++; | |
2699 | } | |
2700 | ||
c906108c SS |
2701 | /* Clear out all variables saying what to do when inferior is continued. |
2702 | First do this, then set the ones you want, then call `proceed'. */ | |
2703 | ||
a7212384 UW |
2704 | static void |
2705 | clear_proceed_status_thread (struct thread_info *tp) | |
c906108c | 2706 | { |
0fab7955 | 2707 | infrun_debug_printf ("%s", tp->ptid.to_string ().c_str ()); |
d6b48e9c | 2708 | |
372316f1 PA |
2709 | /* If we're starting a new sequence, then the previous finished |
2710 | single-step is no longer relevant. */ | |
1edb66d8 | 2711 | if (tp->has_pending_waitstatus ()) |
372316f1 | 2712 | { |
1edb66d8 | 2713 | if (tp->stop_reason () == TARGET_STOPPED_BY_SINGLE_STEP) |
372316f1 | 2714 | { |
1eb8556f SM |
2715 | infrun_debug_printf ("pending event of %s was a finished step. " |
2716 | "Discarding.", | |
0fab7955 | 2717 | tp->ptid.to_string ().c_str ()); |
372316f1 | 2718 | |
1edb66d8 SM |
2719 | tp->clear_pending_waitstatus (); |
2720 | tp->set_stop_reason (TARGET_STOPPED_BY_NO_REASON); | |
372316f1 | 2721 | } |
1eb8556f | 2722 | else |
372316f1 | 2723 | { |
1eb8556f SM |
2724 | infrun_debug_printf |
2725 | ("thread %s has pending wait status %s (currently_stepping=%d).", | |
0fab7955 | 2726 | tp->ptid.to_string ().c_str (), |
7dca2ea7 | 2727 | tp->pending_waitstatus ().to_string ().c_str (), |
1eb8556f | 2728 | currently_stepping (tp)); |
372316f1 PA |
2729 | } |
2730 | } | |
2731 | ||
70509625 PA |
2732 | /* If this signal should not be seen by program, give it zero. |
2733 | Used for debugging signals. */ | |
1edb66d8 SM |
2734 | if (!signal_pass_state (tp->stop_signal ())) |
2735 | tp->set_stop_signal (GDB_SIGNAL_0); | |
70509625 | 2736 | |
573269a8 | 2737 | tp->release_thread_fsm (); |
243a9253 | 2738 | |
16c381f0 JK |
2739 | tp->control.trap_expected = 0; |
2740 | tp->control.step_range_start = 0; | |
2741 | tp->control.step_range_end = 0; | |
c1e36e3e | 2742 | tp->control.may_range_step = 0; |
16c381f0 JK |
2743 | tp->control.step_frame_id = null_frame_id; |
2744 | tp->control.step_stack_frame_id = null_frame_id; | |
2745 | tp->control.step_over_calls = STEP_OVER_UNDEBUGGABLE; | |
03acd4d8 | 2746 | tp->control.step_start_function = nullptr; |
a7212384 | 2747 | tp->stop_requested = 0; |
4e1c45ea | 2748 | |
16c381f0 | 2749 | tp->control.stop_step = 0; |
32400beb | 2750 | |
b986eec5 CL |
2751 | tp->control.proceed_to_finish = 0; |
2752 | ||
856e7dd6 | 2753 | tp->control.stepping_command = 0; |
17b2616c | 2754 | |
a7212384 | 2755 | /* Discard any remaining commands or status from previous stop. */ |
16c381f0 | 2756 | bpstat_clear (&tp->control.stop_bpstat); |
a7212384 | 2757 | } |
32400beb | 2758 | |
a7212384 | 2759 | void |
70509625 | 2760 | clear_proceed_status (int step) |
a7212384 | 2761 | { |
f2665db5 MM |
2762 | /* With scheduler-locking replay, stop replaying other threads if we're |
2763 | not replaying the user-visible resume ptid. | |
2764 | ||
2765 | This is a convenience feature to not require the user to explicitly | |
2766 | stop replaying the other threads. We're assuming that the user's | |
2767 | intent is to resume tracing the recorded process. */ | |
2768 | if (!non_stop && scheduler_mode == schedlock_replay | |
2769 | && target_record_is_replaying (minus_one_ptid) | |
2770 | && !target_record_will_replay (user_visible_resume_ptid (step), | |
2771 | execution_direction)) | |
2772 | target_record_stop_replaying (); | |
2773 | ||
08036331 | 2774 | if (!non_stop && inferior_ptid != null_ptid) |
6c95b8df | 2775 | { |
08036331 | 2776 | ptid_t resume_ptid = user_visible_resume_ptid (step); |
5b6d1e4f PA |
2777 | process_stratum_target *resume_target |
2778 | = user_visible_resume_target (resume_ptid); | |
70509625 PA |
2779 | |
2780 | /* In all-stop mode, delete the per-thread status of all threads | |
2781 | we're about to resume, implicitly and explicitly. */ | |
5b6d1e4f | 2782 | for (thread_info *tp : all_non_exited_threads (resume_target, resume_ptid)) |
08036331 | 2783 | clear_proceed_status_thread (tp); |
6c95b8df PA |
2784 | } |
2785 | ||
d7e15655 | 2786 | if (inferior_ptid != null_ptid) |
a7212384 UW |
2787 | { |
2788 | struct inferior *inferior; | |
2789 | ||
2790 | if (non_stop) | |
2791 | { | |
6c95b8df PA |
2792 | /* If in non-stop mode, only delete the per-thread status of |
2793 | the current thread. */ | |
a7212384 UW |
2794 | clear_proceed_status_thread (inferior_thread ()); |
2795 | } | |
6c95b8df | 2796 | |
d6b48e9c | 2797 | inferior = current_inferior (); |
16c381f0 | 2798 | inferior->control.stop_soon = NO_STOP_QUIETLY; |
4e1c45ea PA |
2799 | } |
2800 | ||
76727919 | 2801 | gdb::observers::about_to_proceed.notify (); |
c906108c SS |
2802 | } |
2803 | ||
99619bea PA |
2804 | /* Returns true if TP is still stopped at a breakpoint that needs |
2805 | stepping-over in order to make progress. If the breakpoint is gone | |
2806 | meanwhile, we can skip the whole step-over dance. */ | |
ea67f13b | 2807 | |
c4464ade | 2808 | static bool |
6c4cfb24 | 2809 | thread_still_needs_step_over_bp (struct thread_info *tp) |
99619bea PA |
2810 | { |
2811 | if (tp->stepping_over_breakpoint) | |
2812 | { | |
00431a78 | 2813 | struct regcache *regcache = get_thread_regcache (tp); |
99619bea | 2814 | |
a01bda52 | 2815 | if (breakpoint_here_p (regcache->aspace (), |
af48d08f PA |
2816 | regcache_read_pc (regcache)) |
2817 | == ordinary_breakpoint_here) | |
c4464ade | 2818 | return true; |
99619bea PA |
2819 | |
2820 | tp->stepping_over_breakpoint = 0; | |
2821 | } | |
2822 | ||
c4464ade | 2823 | return false; |
99619bea PA |
2824 | } |
2825 | ||
6c4cfb24 PA |
2826 | /* Check whether thread TP still needs to start a step-over in order |
2827 | to make progress when resumed. Returns an bitwise or of enum | |
2828 | step_over_what bits, indicating what needs to be stepped over. */ | |
2829 | ||
8d297bbf | 2830 | static step_over_what |
6c4cfb24 PA |
2831 | thread_still_needs_step_over (struct thread_info *tp) |
2832 | { | |
8d297bbf | 2833 | step_over_what what = 0; |
6c4cfb24 PA |
2834 | |
2835 | if (thread_still_needs_step_over_bp (tp)) | |
2836 | what |= STEP_OVER_BREAKPOINT; | |
2837 | ||
2838 | if (tp->stepping_over_watchpoint | |
9aed480c | 2839 | && !target_have_steppable_watchpoint ()) |
6c4cfb24 PA |
2840 | what |= STEP_OVER_WATCHPOINT; |
2841 | ||
2842 | return what; | |
2843 | } | |
2844 | ||
483805cf PA |
2845 | /* Returns true if scheduler locking applies. STEP indicates whether |
2846 | we're about to do a step/next-like command to a thread. */ | |
2847 | ||
c4464ade | 2848 | static bool |
856e7dd6 | 2849 | schedlock_applies (struct thread_info *tp) |
483805cf PA |
2850 | { |
2851 | return (scheduler_mode == schedlock_on | |
2852 | || (scheduler_mode == schedlock_step | |
f2665db5 MM |
2853 | && tp->control.stepping_command) |
2854 | || (scheduler_mode == schedlock_replay | |
2855 | && target_record_will_replay (minus_one_ptid, | |
2856 | execution_direction))); | |
483805cf PA |
2857 | } |
2858 | ||
1192f124 SM |
2859 | /* Set process_stratum_target::COMMIT_RESUMED_STATE in all target |
2860 | stacks that have threads executing and don't have threads with | |
2861 | pending events. */ | |
5b6d1e4f PA |
2862 | |
2863 | static void | |
1192f124 SM |
2864 | maybe_set_commit_resumed_all_targets () |
2865 | { | |
b4b1a226 SM |
2866 | scoped_restore_current_thread restore_thread; |
2867 | ||
1192f124 SM |
2868 | for (inferior *inf : all_non_exited_inferiors ()) |
2869 | { | |
2870 | process_stratum_target *proc_target = inf->process_target (); | |
2871 | ||
2872 | if (proc_target->commit_resumed_state) | |
2873 | { | |
2874 | /* We already set this in a previous iteration, via another | |
2875 | inferior sharing the process_stratum target. */ | |
2876 | continue; | |
2877 | } | |
2878 | ||
2879 | /* If the target has no resumed threads, it would be useless to | |
2880 | ask it to commit the resumed threads. */ | |
2881 | if (!proc_target->threads_executing) | |
2882 | { | |
2883 | infrun_debug_printf ("not requesting commit-resumed for target " | |
2884 | "%s, no resumed threads", | |
2885 | proc_target->shortname ()); | |
2886 | continue; | |
2887 | } | |
2888 | ||
2889 | /* As an optimization, if a thread from this target has some | |
2890 | status to report, handle it before requiring the target to | |
2891 | commit its resumed threads: handling the status might lead to | |
2892 | resuming more threads. */ | |
273dadf2 | 2893 | if (proc_target->has_resumed_with_pending_wait_status ()) |
1192f124 SM |
2894 | { |
2895 | infrun_debug_printf ("not requesting commit-resumed for target %s, a" | |
2896 | " thread has a pending waitstatus", | |
2897 | proc_target->shortname ()); | |
2898 | continue; | |
2899 | } | |
2900 | ||
b4b1a226 SM |
2901 | switch_to_inferior_no_thread (inf); |
2902 | ||
2903 | if (target_has_pending_events ()) | |
2904 | { | |
2905 | infrun_debug_printf ("not requesting commit-resumed for target %s, " | |
2906 | "target has pending events", | |
2907 | proc_target->shortname ()); | |
2908 | continue; | |
2909 | } | |
2910 | ||
1192f124 SM |
2911 | infrun_debug_printf ("enabling commit-resumed for target %s", |
2912 | proc_target->shortname ()); | |
2913 | ||
2914 | proc_target->commit_resumed_state = true; | |
2915 | } | |
2916 | } | |
2917 | ||
2918 | /* See infrun.h. */ | |
2919 | ||
2920 | void | |
2921 | maybe_call_commit_resumed_all_targets () | |
5b6d1e4f PA |
2922 | { |
2923 | scoped_restore_current_thread restore_thread; | |
2924 | ||
1192f124 SM |
2925 | for (inferior *inf : all_non_exited_inferiors ()) |
2926 | { | |
2927 | process_stratum_target *proc_target = inf->process_target (); | |
2928 | ||
2929 | if (!proc_target->commit_resumed_state) | |
2930 | continue; | |
2931 | ||
2932 | switch_to_inferior_no_thread (inf); | |
2933 | ||
2934 | infrun_debug_printf ("calling commit_resumed for target %s", | |
2935 | proc_target->shortname()); | |
2936 | ||
2937 | target_commit_resumed (); | |
2938 | } | |
2939 | } | |
2940 | ||
2941 | /* To track nesting of scoped_disable_commit_resumed objects, ensuring | |
2942 | that only the outermost one attempts to re-enable | |
2943 | commit-resumed. */ | |
2944 | static bool enable_commit_resumed = true; | |
2945 | ||
2946 | /* See infrun.h. */ | |
2947 | ||
2948 | scoped_disable_commit_resumed::scoped_disable_commit_resumed | |
2949 | (const char *reason) | |
2950 | : m_reason (reason), | |
2951 | m_prev_enable_commit_resumed (enable_commit_resumed) | |
2952 | { | |
2953 | infrun_debug_printf ("reason=%s", m_reason); | |
2954 | ||
2955 | enable_commit_resumed = false; | |
5b6d1e4f PA |
2956 | |
2957 | for (inferior *inf : all_non_exited_inferiors ()) | |
1192f124 SM |
2958 | { |
2959 | process_stratum_target *proc_target = inf->process_target (); | |
5b6d1e4f | 2960 | |
1192f124 SM |
2961 | if (m_prev_enable_commit_resumed) |
2962 | { | |
2963 | /* This is the outermost instance: force all | |
2964 | COMMIT_RESUMED_STATE to false. */ | |
2965 | proc_target->commit_resumed_state = false; | |
2966 | } | |
2967 | else | |
2968 | { | |
2969 | /* This is not the outermost instance, we expect | |
2970 | COMMIT_RESUMED_STATE to have been cleared by the | |
2971 | outermost instance. */ | |
2972 | gdb_assert (!proc_target->commit_resumed_state); | |
2973 | } | |
2974 | } | |
2975 | } | |
2976 | ||
2977 | /* See infrun.h. */ | |
2978 | ||
2979 | void | |
2980 | scoped_disable_commit_resumed::reset () | |
2981 | { | |
2982 | if (m_reset) | |
2983 | return; | |
2984 | m_reset = true; | |
2985 | ||
2986 | infrun_debug_printf ("reason=%s", m_reason); | |
2987 | ||
2988 | gdb_assert (!enable_commit_resumed); | |
2989 | ||
2990 | enable_commit_resumed = m_prev_enable_commit_resumed; | |
2991 | ||
2992 | if (m_prev_enable_commit_resumed) | |
5b6d1e4f | 2993 | { |
1192f124 SM |
2994 | /* This is the outermost instance, re-enable |
2995 | COMMIT_RESUMED_STATE on the targets where it's possible. */ | |
2996 | maybe_set_commit_resumed_all_targets (); | |
2997 | } | |
2998 | else | |
2999 | { | |
3000 | /* This is not the outermost instance, we expect | |
3001 | COMMIT_RESUMED_STATE to still be false. */ | |
3002 | for (inferior *inf : all_non_exited_inferiors ()) | |
3003 | { | |
3004 | process_stratum_target *proc_target = inf->process_target (); | |
3005 | gdb_assert (!proc_target->commit_resumed_state); | |
3006 | } | |
3007 | } | |
3008 | } | |
3009 | ||
3010 | /* See infrun.h. */ | |
3011 | ||
3012 | scoped_disable_commit_resumed::~scoped_disable_commit_resumed () | |
3013 | { | |
3014 | reset (); | |
3015 | } | |
3016 | ||
3017 | /* See infrun.h. */ | |
3018 | ||
3019 | void | |
3020 | scoped_disable_commit_resumed::reset_and_commit () | |
3021 | { | |
3022 | reset (); | |
3023 | maybe_call_commit_resumed_all_targets (); | |
3024 | } | |
3025 | ||
3026 | /* See infrun.h. */ | |
3027 | ||
3028 | scoped_enable_commit_resumed::scoped_enable_commit_resumed | |
3029 | (const char *reason) | |
3030 | : m_reason (reason), | |
3031 | m_prev_enable_commit_resumed (enable_commit_resumed) | |
3032 | { | |
3033 | infrun_debug_printf ("reason=%s", m_reason); | |
3034 | ||
3035 | if (!enable_commit_resumed) | |
3036 | { | |
3037 | enable_commit_resumed = true; | |
3038 | ||
3039 | /* Re-enable COMMIT_RESUMED_STATE on the targets where it's | |
3040 | possible. */ | |
3041 | maybe_set_commit_resumed_all_targets (); | |
3042 | ||
3043 | maybe_call_commit_resumed_all_targets (); | |
3044 | } | |
3045 | } | |
3046 | ||
3047 | /* See infrun.h. */ | |
3048 | ||
3049 | scoped_enable_commit_resumed::~scoped_enable_commit_resumed () | |
3050 | { | |
3051 | infrun_debug_printf ("reason=%s", m_reason); | |
3052 | ||
3053 | gdb_assert (enable_commit_resumed); | |
3054 | ||
3055 | enable_commit_resumed = m_prev_enable_commit_resumed; | |
3056 | ||
3057 | if (!enable_commit_resumed) | |
3058 | { | |
3059 | /* Force all COMMIT_RESUMED_STATE back to false. */ | |
3060 | for (inferior *inf : all_non_exited_inferiors ()) | |
3061 | { | |
3062 | process_stratum_target *proc_target = inf->process_target (); | |
3063 | proc_target->commit_resumed_state = false; | |
3064 | } | |
5b6d1e4f PA |
3065 | } |
3066 | } | |
3067 | ||
2f4fcf00 PA |
3068 | /* Check that all the targets we're about to resume are in non-stop |
3069 | mode. Ideally, we'd only care whether all targets support | |
3070 | target-async, but we're not there yet. E.g., stop_all_threads | |
3071 | doesn't know how to handle all-stop targets. Also, the remote | |
3072 | protocol in all-stop mode is synchronous, irrespective of | |
3073 | target-async, which means that things like a breakpoint re-set | |
3074 | triggered by one target would try to read memory from all targets | |
3075 | and fail. */ | |
3076 | ||
3077 | static void | |
3078 | check_multi_target_resumption (process_stratum_target *resume_target) | |
3079 | { | |
3080 | if (!non_stop && resume_target == nullptr) | |
3081 | { | |
3082 | scoped_restore_current_thread restore_thread; | |
3083 | ||
3084 | /* This is used to track whether we're resuming more than one | |
3085 | target. */ | |
3086 | process_stratum_target *first_connection = nullptr; | |
3087 | ||
3088 | /* The first inferior we see with a target that does not work in | |
3089 | always-non-stop mode. */ | |
3090 | inferior *first_not_non_stop = nullptr; | |
3091 | ||
f058c521 | 3092 | for (inferior *inf : all_non_exited_inferiors ()) |
2f4fcf00 PA |
3093 | { |
3094 | switch_to_inferior_no_thread (inf); | |
3095 | ||
55f6301a | 3096 | if (!target_has_execution ()) |
2f4fcf00 PA |
3097 | continue; |
3098 | ||
3099 | process_stratum_target *proc_target | |
3100 | = current_inferior ()->process_target(); | |
3101 | ||
3102 | if (!target_is_non_stop_p ()) | |
3103 | first_not_non_stop = inf; | |
3104 | ||
3105 | if (first_connection == nullptr) | |
3106 | first_connection = proc_target; | |
3107 | else if (first_connection != proc_target | |
3108 | && first_not_non_stop != nullptr) | |
3109 | { | |
3110 | switch_to_inferior_no_thread (first_not_non_stop); | |
3111 | ||
3112 | proc_target = current_inferior ()->process_target(); | |
3113 | ||
3114 | error (_("Connection %d (%s) does not support " | |
3115 | "multi-target resumption."), | |
3116 | proc_target->connection_number, | |
3117 | make_target_connection_string (proc_target).c_str ()); | |
3118 | } | |
3119 | } | |
3120 | } | |
3121 | } | |
3122 | ||
c906108c SS |
3123 | /* Basic routine for continuing the program in various fashions. |
3124 | ||
3125 | ADDR is the address to resume at, or -1 for resume where stopped. | |
aff4e175 AB |
3126 | SIGGNAL is the signal to give it, or GDB_SIGNAL_0 for none, |
3127 | or GDB_SIGNAL_DEFAULT for act according to how it stopped. | |
c906108c SS |
3128 | |
3129 | You should call clear_proceed_status before calling proceed. */ | |
3130 | ||
3131 | void | |
64ce06e4 | 3132 | proceed (CORE_ADDR addr, enum gdb_signal siggnal) |
c906108c | 3133 | { |
3ec3145c SM |
3134 | INFRUN_SCOPED_DEBUG_ENTER_EXIT; |
3135 | ||
e58b0e63 PA |
3136 | struct regcache *regcache; |
3137 | struct gdbarch *gdbarch; | |
e58b0e63 | 3138 | CORE_ADDR pc; |
c906108c | 3139 | |
e58b0e63 PA |
3140 | /* If we're stopped at a fork/vfork, follow the branch set by the |
3141 | "set follow-fork-mode" command; otherwise, we'll just proceed | |
3142 | resuming the current thread. */ | |
3143 | if (!follow_fork ()) | |
3144 | { | |
3145 | /* The target for some reason decided not to resume. */ | |
3146 | normal_stop (); | |
f148b27e | 3147 | if (target_can_async_p ()) |
b1a35af2 | 3148 | inferior_event_handler (INF_EXEC_COMPLETE); |
e58b0e63 PA |
3149 | return; |
3150 | } | |
3151 | ||
842951eb PA |
3152 | /* We'll update this if & when we switch to a new thread. */ |
3153 | previous_inferior_ptid = inferior_ptid; | |
3154 | ||
e58b0e63 | 3155 | regcache = get_current_regcache (); |
ac7936df | 3156 | gdbarch = regcache->arch (); |
8b86c959 YQ |
3157 | const address_space *aspace = regcache->aspace (); |
3158 | ||
fc75c28b TBA |
3159 | pc = regcache_read_pc_protected (regcache); |
3160 | ||
08036331 | 3161 | thread_info *cur_thr = inferior_thread (); |
e58b0e63 | 3162 | |
99619bea | 3163 | /* Fill in with reasonable starting values. */ |
08036331 | 3164 | init_thread_stepping_state (cur_thr); |
99619bea | 3165 | |
08036331 | 3166 | gdb_assert (!thread_is_in_step_over_chain (cur_thr)); |
c2829269 | 3167 | |
5b6d1e4f PA |
3168 | ptid_t resume_ptid |
3169 | = user_visible_resume_ptid (cur_thr->control.stepping_command); | |
3170 | process_stratum_target *resume_target | |
3171 | = user_visible_resume_target (resume_ptid); | |
3172 | ||
2f4fcf00 PA |
3173 | check_multi_target_resumption (resume_target); |
3174 | ||
2acceee2 | 3175 | if (addr == (CORE_ADDR) -1) |
c906108c | 3176 | { |
351031f2 AB |
3177 | if (cur_thr->stop_pc_p () |
3178 | && pc == cur_thr->stop_pc () | |
af48d08f | 3179 | && breakpoint_here_p (aspace, pc) == ordinary_breakpoint_here |
b2175913 | 3180 | && execution_direction != EXEC_REVERSE) |
3352ef37 AC |
3181 | /* There is a breakpoint at the address we will resume at, |
3182 | step one instruction before inserting breakpoints so that | |
3183 | we do not stop right away (and report a second hit at this | |
b2175913 MS |
3184 | breakpoint). |
3185 | ||
3186 | Note, we don't do this in reverse, because we won't | |
3187 | actually be executing the breakpoint insn anyway. | |
3188 | We'll be (un-)executing the previous instruction. */ | |
08036331 | 3189 | cur_thr->stepping_over_breakpoint = 1; |
515630c5 UW |
3190 | else if (gdbarch_single_step_through_delay_p (gdbarch) |
3191 | && gdbarch_single_step_through_delay (gdbarch, | |
3192 | get_current_frame ())) | |
3352ef37 AC |
3193 | /* We stepped onto an instruction that needs to be stepped |
3194 | again before re-inserting the breakpoint, do so. */ | |
08036331 | 3195 | cur_thr->stepping_over_breakpoint = 1; |
c906108c SS |
3196 | } |
3197 | else | |
3198 | { | |
515630c5 | 3199 | regcache_write_pc (regcache, addr); |
c906108c SS |
3200 | } |
3201 | ||
70509625 | 3202 | if (siggnal != GDB_SIGNAL_DEFAULT) |
1edb66d8 | 3203 | cur_thr->set_stop_signal (siggnal); |
70509625 | 3204 | |
4d9d9d04 PA |
3205 | /* If an exception is thrown from this point on, make sure to |
3206 | propagate GDB's knowledge of the executing state to the | |
3207 | frontend/user running state. */ | |
5b6d1e4f | 3208 | scoped_finish_thread_state finish_state (resume_target, resume_ptid); |
4d9d9d04 PA |
3209 | |
3210 | /* Even if RESUME_PTID is a wildcard, and we end up resuming fewer | |
3211 | threads (e.g., we might need to set threads stepping over | |
3212 | breakpoints first), from the user/frontend's point of view, all | |
3213 | threads in RESUME_PTID are now running. Unless we're calling an | |
3214 | inferior function, as in that case we pretend the inferior | |
3215 | doesn't run at all. */ | |
08036331 | 3216 | if (!cur_thr->control.in_infcall) |
719546c4 | 3217 | set_running (resume_target, resume_ptid, true); |
17b2616c | 3218 | |
1eb8556f SM |
3219 | infrun_debug_printf ("addr=%s, signal=%s", paddress (gdbarch, addr), |
3220 | gdb_signal_to_symbol_string (siggnal)); | |
527159b7 | 3221 | |
4d9d9d04 PA |
3222 | annotate_starting (); |
3223 | ||
3224 | /* Make sure that output from GDB appears before output from the | |
3225 | inferior. */ | |
3226 | gdb_flush (gdb_stdout); | |
3227 | ||
d930703d PA |
3228 | /* Since we've marked the inferior running, give it the terminal. A |
3229 | QUIT/Ctrl-C from here on is forwarded to the target (which can | |
3230 | still detect attempts to unblock a stuck connection with repeated | |
3231 | Ctrl-C from within target_pass_ctrlc). */ | |
3232 | target_terminal::inferior (); | |
3233 | ||
4d9d9d04 PA |
3234 | /* In a multi-threaded task we may select another thread and |
3235 | then continue or step. | |
3236 | ||
3237 | But if a thread that we're resuming had stopped at a breakpoint, | |
3238 | it will immediately cause another breakpoint stop without any | |
3239 | execution (i.e. it will report a breakpoint hit incorrectly). So | |
3240 | we must step over it first. | |
3241 | ||
3242 | Look for threads other than the current (TP) that reported a | |
3243 | breakpoint hit and haven't been resumed yet since. */ | |
3244 | ||
3245 | /* If scheduler locking applies, we can avoid iterating over all | |
3246 | threads. */ | |
08036331 | 3247 | if (!non_stop && !schedlock_applies (cur_thr)) |
94cc34af | 3248 | { |
5b6d1e4f PA |
3249 | for (thread_info *tp : all_non_exited_threads (resume_target, |
3250 | resume_ptid)) | |
08036331 | 3251 | { |
f3f8ece4 PA |
3252 | switch_to_thread_no_regs (tp); |
3253 | ||
4d9d9d04 PA |
3254 | /* Ignore the current thread here. It's handled |
3255 | afterwards. */ | |
08036331 | 3256 | if (tp == cur_thr) |
4d9d9d04 | 3257 | continue; |
c906108c | 3258 | |
4d9d9d04 PA |
3259 | if (!thread_still_needs_step_over (tp)) |
3260 | continue; | |
3261 | ||
3262 | gdb_assert (!thread_is_in_step_over_chain (tp)); | |
c906108c | 3263 | |
1eb8556f | 3264 | infrun_debug_printf ("need to step-over [%s] first", |
0fab7955 | 3265 | tp->ptid.to_string ().c_str ()); |
99619bea | 3266 | |
28d5518b | 3267 | global_thread_step_over_chain_enqueue (tp); |
2adfaa28 | 3268 | } |
f3f8ece4 PA |
3269 | |
3270 | switch_to_thread (cur_thr); | |
30852783 UW |
3271 | } |
3272 | ||
4d9d9d04 PA |
3273 | /* Enqueue the current thread last, so that we move all other |
3274 | threads over their breakpoints first. */ | |
08036331 | 3275 | if (cur_thr->stepping_over_breakpoint) |
28d5518b | 3276 | global_thread_step_over_chain_enqueue (cur_thr); |
30852783 | 3277 | |
4d9d9d04 PA |
3278 | /* If the thread isn't started, we'll still need to set its prev_pc, |
3279 | so that switch_back_to_stepped_thread knows the thread hasn't | |
3280 | advanced. Must do this before resuming any thread, as in | |
3281 | all-stop/remote, once we resume we can't send any other packet | |
3282 | until the target stops again. */ | |
fc75c28b | 3283 | cur_thr->prev_pc = regcache_read_pc_protected (regcache); |
99619bea | 3284 | |
a9bc57b9 | 3285 | { |
1192f124 | 3286 | scoped_disable_commit_resumed disable_commit_resumed ("proceeding"); |
8bf10e2e | 3287 | bool step_over_started = start_step_over (); |
c906108c | 3288 | |
a9bc57b9 TT |
3289 | if (step_over_info_valid_p ()) |
3290 | { | |
3291 | /* Either this thread started a new in-line step over, or some | |
3292 | other thread was already doing one. In either case, don't | |
3293 | resume anything else until the step-over is finished. */ | |
3294 | } | |
8bf10e2e | 3295 | else if (step_over_started && !target_is_non_stop_p ()) |
a9bc57b9 TT |
3296 | { |
3297 | /* A new displaced stepping sequence was started. In all-stop, | |
3298 | we can't talk to the target anymore until it next stops. */ | |
3299 | } | |
3300 | else if (!non_stop && target_is_non_stop_p ()) | |
3301 | { | |
3ec3145c SM |
3302 | INFRUN_SCOPED_DEBUG_START_END |
3303 | ("resuming threads, all-stop-on-top-of-non-stop"); | |
3304 | ||
a9bc57b9 TT |
3305 | /* In all-stop, but the target is always in non-stop mode. |
3306 | Start all other threads that are implicitly resumed too. */ | |
5b6d1e4f PA |
3307 | for (thread_info *tp : all_non_exited_threads (resume_target, |
3308 | resume_ptid)) | |
3309 | { | |
3310 | switch_to_thread_no_regs (tp); | |
3311 | ||
f9fac3c8 SM |
3312 | if (!tp->inf->has_execution ()) |
3313 | { | |
1eb8556f | 3314 | infrun_debug_printf ("[%s] target has no execution", |
0fab7955 | 3315 | tp->ptid.to_string ().c_str ()); |
f9fac3c8 SM |
3316 | continue; |
3317 | } | |
f3f8ece4 | 3318 | |
7846f3aa | 3319 | if (tp->resumed ()) |
f9fac3c8 | 3320 | { |
1eb8556f | 3321 | infrun_debug_printf ("[%s] resumed", |
0fab7955 | 3322 | tp->ptid.to_string ().c_str ()); |
611841bb | 3323 | gdb_assert (tp->executing () || tp->has_pending_waitstatus ()); |
f9fac3c8 SM |
3324 | continue; |
3325 | } | |
fbea99ea | 3326 | |
f9fac3c8 SM |
3327 | if (thread_is_in_step_over_chain (tp)) |
3328 | { | |
1eb8556f | 3329 | infrun_debug_printf ("[%s] needs step-over", |
0fab7955 | 3330 | tp->ptid.to_string ().c_str ()); |
f9fac3c8 SM |
3331 | continue; |
3332 | } | |
fbea99ea | 3333 | |
d8bbae6e SM |
3334 | /* If a thread of that inferior is waiting for a vfork-done |
3335 | (for a detached vfork child to exec or exit), breakpoints are | |
3336 | removed. We must not resume any thread of that inferior, other | |
3337 | than the one waiting for the vfork-done. */ | |
3338 | if (tp->inf->thread_waiting_for_vfork_done != nullptr | |
3339 | && tp != tp->inf->thread_waiting_for_vfork_done) | |
3340 | { | |
3341 | infrun_debug_printf ("[%s] another thread of this inferior is " | |
3342 | "waiting for vfork-done", | |
3343 | tp->ptid.to_string ().c_str ()); | |
3344 | continue; | |
3345 | } | |
3346 | ||
1eb8556f | 3347 | infrun_debug_printf ("resuming %s", |
0fab7955 | 3348 | tp->ptid.to_string ().c_str ()); |
fbea99ea | 3349 | |
aa563d16 | 3350 | execution_control_state ecs (tp); |
f9fac3c8 | 3351 | switch_to_thread (tp); |
aa563d16 TT |
3352 | keep_going_pass_signal (&ecs); |
3353 | if (!ecs.wait_some_more) | |
f9fac3c8 SM |
3354 | error (_("Command aborted.")); |
3355 | } | |
a9bc57b9 | 3356 | } |
d8bbae6e SM |
3357 | else if (!cur_thr->resumed () |
3358 | && !thread_is_in_step_over_chain (cur_thr) | |
3359 | /* In non-stop, forbid resuming a thread if some other thread of | |
3360 | that inferior is waiting for a vfork-done event (this means | |
3361 | breakpoints are out for this inferior). */ | |
3362 | && !(non_stop | |
3363 | && cur_thr->inf->thread_waiting_for_vfork_done != nullptr)) | |
a9bc57b9 TT |
3364 | { |
3365 | /* The thread wasn't started, and isn't queued, run it now. */ | |
aa563d16 | 3366 | execution_control_state ecs (cur_thr); |
08036331 | 3367 | switch_to_thread (cur_thr); |
aa563d16 TT |
3368 | keep_going_pass_signal (&ecs); |
3369 | if (!ecs.wait_some_more) | |
a9bc57b9 TT |
3370 | error (_("Command aborted.")); |
3371 | } | |
c906108c | 3372 | |
1192f124 SM |
3373 | disable_commit_resumed.reset_and_commit (); |
3374 | } | |
85ad3aaf | 3375 | |
731f534f | 3376 | finish_state.release (); |
c906108c | 3377 | |
873657b9 PA |
3378 | /* If we've switched threads above, switch back to the previously |
3379 | current thread. We don't want the user to see a different | |
3380 | selected thread. */ | |
3381 | switch_to_thread (cur_thr); | |
3382 | ||
0b333c5e PA |
3383 | /* Tell the event loop to wait for it to stop. If the target |
3384 | supports asynchronous execution, it'll do this from within | |
3385 | target_resume. */ | |
362646f5 | 3386 | if (!target_can_async_p ()) |
0b333c5e | 3387 | mark_async_event_handler (infrun_async_inferior_event_token); |
c906108c | 3388 | } |
c906108c SS |
3389 | \f |
3390 | ||
3391 | /* Start remote-debugging of a machine over a serial link. */ | |
96baa820 | 3392 | |
c906108c | 3393 | void |
8621d6a9 | 3394 | start_remote (int from_tty) |
c906108c | 3395 | { |
5b6d1e4f PA |
3396 | inferior *inf = current_inferior (); |
3397 | inf->control.stop_soon = STOP_QUIETLY_REMOTE; | |
43ff13b4 | 3398 | |
1777feb0 | 3399 | /* Always go on waiting for the target, regardless of the mode. */ |
6426a772 | 3400 | /* FIXME: cagney/1999-09-23: At present it isn't possible to |
7e73cedf | 3401 | indicate to wait_for_inferior that a target should timeout if |
6426a772 JM |
3402 | nothing is returned (instead of just blocking). Because of this, |
3403 | targets expecting an immediate response need to, internally, set | |
3404 | things up so that the target_wait() is forced to eventually | |
1777feb0 | 3405 | timeout. */ |
6426a772 JM |
3406 | /* FIXME: cagney/1999-09-24: It isn't possible for target_open() to |
3407 | differentiate to its caller what the state of the target is after | |
3408 | the initial open has been performed. Here we're assuming that | |
3409 | the target has stopped. It should be possible to eventually have | |
3410 | target_open() return to the caller an indication that the target | |
3411 | is currently running and GDB state should be set to the same as | |
1777feb0 | 3412 | for an async run. */ |
5b6d1e4f | 3413 | wait_for_inferior (inf); |
8621d6a9 DJ |
3414 | |
3415 | /* Now that the inferior has stopped, do any bookkeeping like | |
3416 | loading shared libraries. We want to do this before normal_stop, | |
3417 | so that the displayed frame is up to date. */ | |
a7aba266 | 3418 | post_create_inferior (from_tty); |
8621d6a9 | 3419 | |
6426a772 | 3420 | normal_stop (); |
c906108c SS |
3421 | } |
3422 | ||
3423 | /* Initialize static vars when a new inferior begins. */ | |
3424 | ||
3425 | void | |
96baa820 | 3426 | init_wait_for_inferior (void) |
c906108c SS |
3427 | { |
3428 | /* These are meaningless until the first time through wait_for_inferior. */ | |
c906108c | 3429 | |
c906108c SS |
3430 | breakpoint_init_inferior (inf_starting); |
3431 | ||
70509625 | 3432 | clear_proceed_status (0); |
9f976b41 | 3433 | |
ab1ddbcf | 3434 | nullify_last_target_wait_ptid (); |
237fc4c9 | 3435 | |
842951eb | 3436 | previous_inferior_ptid = inferior_ptid; |
c906108c | 3437 | } |
237fc4c9 | 3438 | |
c906108c | 3439 | \f |
488f131b | 3440 | |
ec9499be | 3441 | static void handle_inferior_event (struct execution_control_state *ecs); |
cd0fc7c3 | 3442 | |
568d6575 UW |
3443 | static void handle_step_into_function (struct gdbarch *gdbarch, |
3444 | struct execution_control_state *ecs); | |
3445 | static void handle_step_into_function_backward (struct gdbarch *gdbarch, | |
3446 | struct execution_control_state *ecs); | |
4f5d7f63 | 3447 | static void handle_signal_stop (struct execution_control_state *ecs); |
186c406b | 3448 | static void check_exception_resume (struct execution_control_state *, |
9efe17a3 | 3449 | frame_info_ptr); |
611c83ae | 3450 | |
bdc36728 | 3451 | static void end_stepping_range (struct execution_control_state *ecs); |
22bcd14b | 3452 | static void stop_waiting (struct execution_control_state *ecs); |
d4f3574e | 3453 | static void keep_going (struct execution_control_state *ecs); |
94c57d6a | 3454 | static void process_event_stop_test (struct execution_control_state *ecs); |
c4464ade | 3455 | static bool switch_back_to_stepped_thread (struct execution_control_state *ecs); |
104c1213 | 3456 | |
252fbfc8 PA |
3457 | /* This function is attached as a "thread_stop_requested" observer. |
3458 | Cleanup local state that assumed the PTID was to be resumed, and | |
3459 | report the stop to the frontend. */ | |
3460 | ||
2c0b251b | 3461 | static void |
252fbfc8 PA |
3462 | infrun_thread_stop_requested (ptid_t ptid) |
3463 | { | |
5b6d1e4f PA |
3464 | process_stratum_target *curr_target = current_inferior ()->process_target (); |
3465 | ||
c65d6b55 PA |
3466 | /* PTID was requested to stop. If the thread was already stopped, |
3467 | but the user/frontend doesn't know about that yet (e.g., the | |
3468 | thread had been temporarily paused for some step-over), set up | |
3469 | for reporting the stop now. */ | |
5b6d1e4f | 3470 | for (thread_info *tp : all_threads (curr_target, ptid)) |
08036331 PA |
3471 | { |
3472 | if (tp->state != THREAD_RUNNING) | |
3473 | continue; | |
611841bb | 3474 | if (tp->executing ()) |
08036331 | 3475 | continue; |
c65d6b55 | 3476 | |
08036331 PA |
3477 | /* Remove matching threads from the step-over queue, so |
3478 | start_step_over doesn't try to resume them | |
3479 | automatically. */ | |
3480 | if (thread_is_in_step_over_chain (tp)) | |
28d5518b | 3481 | global_thread_step_over_chain_remove (tp); |
c65d6b55 | 3482 | |
08036331 PA |
3483 | /* If the thread is stopped, but the user/frontend doesn't |
3484 | know about that yet, queue a pending event, as if the | |
3485 | thread had just stopped now. Unless the thread already had | |
3486 | a pending event. */ | |
1edb66d8 | 3487 | if (!tp->has_pending_waitstatus ()) |
08036331 | 3488 | { |
1edb66d8 | 3489 | target_waitstatus ws; |
183be222 | 3490 | ws.set_stopped (GDB_SIGNAL_0); |
1edb66d8 | 3491 | tp->set_pending_waitstatus (ws); |
08036331 | 3492 | } |
c65d6b55 | 3493 | |
08036331 PA |
3494 | /* Clear the inline-frame state, since we're re-processing the |
3495 | stop. */ | |
5b6d1e4f | 3496 | clear_inline_frame_state (tp); |
c65d6b55 | 3497 | |
08036331 PA |
3498 | /* If this thread was paused because some other thread was |
3499 | doing an inline-step over, let that finish first. Once | |
3500 | that happens, we'll restart all threads and consume pending | |
3501 | stop events then. */ | |
3502 | if (step_over_info_valid_p ()) | |
3503 | continue; | |
3504 | ||
3505 | /* Otherwise we can process the (new) pending event now. Set | |
3506 | it so this pending event is considered by | |
3507 | do_target_wait. */ | |
7846f3aa | 3508 | tp->set_resumed (true); |
08036331 | 3509 | } |
252fbfc8 PA |
3510 | } |
3511 | ||
a07daef3 PA |
3512 | static void |
3513 | infrun_thread_thread_exit (struct thread_info *tp, int silent) | |
3514 | { | |
5b6d1e4f PA |
3515 | if (target_last_proc_target == tp->inf->process_target () |
3516 | && target_last_wait_ptid == tp->ptid) | |
a07daef3 PA |
3517 | nullify_last_target_wait_ptid (); |
3518 | } | |
3519 | ||
0cbcdb96 PA |
3520 | /* Delete the step resume, single-step and longjmp/exception resume |
3521 | breakpoints of TP. */ | |
4e1c45ea | 3522 | |
0cbcdb96 PA |
3523 | static void |
3524 | delete_thread_infrun_breakpoints (struct thread_info *tp) | |
4e1c45ea | 3525 | { |
0cbcdb96 PA |
3526 | delete_step_resume_breakpoint (tp); |
3527 | delete_exception_resume_breakpoint (tp); | |
34b7e8a6 | 3528 | delete_single_step_breakpoints (tp); |
4e1c45ea PA |
3529 | } |
3530 | ||
0cbcdb96 PA |
3531 | /* If the target still has execution, call FUNC for each thread that |
3532 | just stopped. In all-stop, that's all the non-exited threads; in | |
3533 | non-stop, that's the current thread, only. */ | |
3534 | ||
3535 | typedef void (*for_each_just_stopped_thread_callback_func) | |
3536 | (struct thread_info *tp); | |
4e1c45ea PA |
3537 | |
3538 | static void | |
0cbcdb96 | 3539 | for_each_just_stopped_thread (for_each_just_stopped_thread_callback_func func) |
4e1c45ea | 3540 | { |
55f6301a | 3541 | if (!target_has_execution () || inferior_ptid == null_ptid) |
4e1c45ea PA |
3542 | return; |
3543 | ||
fbea99ea | 3544 | if (target_is_non_stop_p ()) |
4e1c45ea | 3545 | { |
0cbcdb96 PA |
3546 | /* If in non-stop mode, only the current thread stopped. */ |
3547 | func (inferior_thread ()); | |
4e1c45ea PA |
3548 | } |
3549 | else | |
0cbcdb96 | 3550 | { |
0cbcdb96 | 3551 | /* In all-stop mode, all threads have stopped. */ |
08036331 PA |
3552 | for (thread_info *tp : all_non_exited_threads ()) |
3553 | func (tp); | |
0cbcdb96 PA |
3554 | } |
3555 | } | |
3556 | ||
3557 | /* Delete the step resume and longjmp/exception resume breakpoints of | |
3558 | the threads that just stopped. */ | |
3559 | ||
3560 | static void | |
3561 | delete_just_stopped_threads_infrun_breakpoints (void) | |
3562 | { | |
3563 | for_each_just_stopped_thread (delete_thread_infrun_breakpoints); | |
34b7e8a6 PA |
3564 | } |
3565 | ||
3566 | /* Delete the single-step breakpoints of the threads that just | |
3567 | stopped. */ | |
7c16b83e | 3568 | |
34b7e8a6 PA |
3569 | static void |
3570 | delete_just_stopped_threads_single_step_breakpoints (void) | |
3571 | { | |
3572 | for_each_just_stopped_thread (delete_single_step_breakpoints); | |
4e1c45ea PA |
3573 | } |
3574 | ||
221e1a37 | 3575 | /* See infrun.h. */ |
223698f8 | 3576 | |
221e1a37 | 3577 | void |
223698f8 | 3578 | print_target_wait_results (ptid_t waiton_ptid, ptid_t result_ptid, |
c272a98c | 3579 | const struct target_waitstatus &ws) |
223698f8 | 3580 | { |
17e971f7 SM |
3581 | infrun_debug_printf ("target_wait (%s [%s], status) =", |
3582 | waiton_ptid.to_string ().c_str (), | |
e71daf80 | 3583 | target_pid_to_str (waiton_ptid).c_str ()); |
17e971f7 SM |
3584 | infrun_debug_printf (" %s [%s],", |
3585 | result_ptid.to_string ().c_str (), | |
e71daf80 | 3586 | target_pid_to_str (result_ptid).c_str ()); |
c272a98c | 3587 | infrun_debug_printf (" %s", ws.to_string ().c_str ()); |
223698f8 DE |
3588 | } |
3589 | ||
372316f1 PA |
3590 | /* Select a thread at random, out of those which are resumed and have |
3591 | had events. */ | |
3592 | ||
3593 | static struct thread_info * | |
5b6d1e4f | 3594 | random_pending_event_thread (inferior *inf, ptid_t waiton_ptid) |
372316f1 | 3595 | { |
71a23490 SM |
3596 | process_stratum_target *proc_target = inf->process_target (); |
3597 | thread_info *thread | |
3598 | = proc_target->random_resumed_with_pending_wait_status (inf, waiton_ptid); | |
08036331 | 3599 | |
71a23490 | 3600 | if (thread == nullptr) |
08036331 | 3601 | { |
71a23490 SM |
3602 | infrun_debug_printf ("None found."); |
3603 | return nullptr; | |
3604 | } | |
372316f1 | 3605 | |
0fab7955 | 3606 | infrun_debug_printf ("Found %s.", thread->ptid.to_string ().c_str ()); |
71a23490 SM |
3607 | gdb_assert (thread->resumed ()); |
3608 | gdb_assert (thread->has_pending_waitstatus ()); | |
372316f1 | 3609 | |
71a23490 | 3610 | return thread; |
372316f1 PA |
3611 | } |
3612 | ||
3613 | /* Wrapper for target_wait that first checks whether threads have | |
3614 | pending statuses to report before actually asking the target for | |
5b6d1e4f PA |
3615 | more events. INF is the inferior we're using to call target_wait |
3616 | on. */ | |
372316f1 PA |
3617 | |
3618 | static ptid_t | |
5b6d1e4f | 3619 | do_target_wait_1 (inferior *inf, ptid_t ptid, |
b60cea74 | 3620 | target_waitstatus *status, target_wait_flags options) |
372316f1 | 3621 | { |
372316f1 PA |
3622 | struct thread_info *tp; |
3623 | ||
24ed6739 AB |
3624 | /* We know that we are looking for an event in the target of inferior |
3625 | INF, but we don't know which thread the event might come from. As | |
3626 | such we want to make sure that INFERIOR_PTID is reset so that none of | |
3627 | the wait code relies on it - doing so is always a mistake. */ | |
3628 | switch_to_inferior_no_thread (inf); | |
3629 | ||
372316f1 PA |
3630 | /* First check if there is a resumed thread with a wait status |
3631 | pending. */ | |
d7e15655 | 3632 | if (ptid == minus_one_ptid || ptid.is_pid ()) |
372316f1 | 3633 | { |
5b6d1e4f | 3634 | tp = random_pending_event_thread (inf, ptid); |
372316f1 PA |
3635 | } |
3636 | else | |
3637 | { | |
1eb8556f | 3638 | infrun_debug_printf ("Waiting for specific thread %s.", |
0fab7955 | 3639 | ptid.to_string ().c_str ()); |
372316f1 PA |
3640 | |
3641 | /* We have a specific thread to check. */ | |
5b6d1e4f | 3642 | tp = find_thread_ptid (inf, ptid); |
03acd4d8 | 3643 | gdb_assert (tp != nullptr); |
1edb66d8 | 3644 | if (!tp->has_pending_waitstatus ()) |
03acd4d8 | 3645 | tp = nullptr; |
372316f1 PA |
3646 | } |
3647 | ||
03acd4d8 | 3648 | if (tp != nullptr |
1edb66d8 SM |
3649 | && (tp->stop_reason () == TARGET_STOPPED_BY_SW_BREAKPOINT |
3650 | || tp->stop_reason () == TARGET_STOPPED_BY_HW_BREAKPOINT)) | |
372316f1 | 3651 | { |
00431a78 | 3652 | struct regcache *regcache = get_thread_regcache (tp); |
ac7936df | 3653 | struct gdbarch *gdbarch = regcache->arch (); |
372316f1 PA |
3654 | CORE_ADDR pc; |
3655 | int discard = 0; | |
3656 | ||
3657 | pc = regcache_read_pc (regcache); | |
3658 | ||
1edb66d8 | 3659 | if (pc != tp->stop_pc ()) |
372316f1 | 3660 | { |
1eb8556f | 3661 | infrun_debug_printf ("PC of %s changed. was=%s, now=%s", |
0fab7955 | 3662 | tp->ptid.to_string ().c_str (), |
1edb66d8 | 3663 | paddress (gdbarch, tp->stop_pc ()), |
1eb8556f | 3664 | paddress (gdbarch, pc)); |
372316f1 PA |
3665 | discard = 1; |
3666 | } | |
a01bda52 | 3667 | else if (!breakpoint_inserted_here_p (regcache->aspace (), pc)) |
372316f1 | 3668 | { |
1eb8556f | 3669 | infrun_debug_printf ("previous breakpoint of %s, at %s gone", |
0fab7955 | 3670 | tp->ptid.to_string ().c_str (), |
1eb8556f | 3671 | paddress (gdbarch, pc)); |
372316f1 PA |
3672 | |
3673 | discard = 1; | |
3674 | } | |
3675 | ||
3676 | if (discard) | |
3677 | { | |
1eb8556f | 3678 | infrun_debug_printf ("pending event of %s cancelled.", |
0fab7955 | 3679 | tp->ptid.to_string ().c_str ()); |
372316f1 | 3680 | |
1edb66d8 SM |
3681 | tp->clear_pending_waitstatus (); |
3682 | target_waitstatus ws; | |
183be222 | 3683 | ws.set_spurious (); |
1edb66d8 SM |
3684 | tp->set_pending_waitstatus (ws); |
3685 | tp->set_stop_reason (TARGET_STOPPED_BY_NO_REASON); | |
372316f1 PA |
3686 | } |
3687 | } | |
3688 | ||
03acd4d8 | 3689 | if (tp != nullptr) |
372316f1 | 3690 | { |
1eb8556f | 3691 | infrun_debug_printf ("Using pending wait status %s for %s.", |
7dca2ea7 | 3692 | tp->pending_waitstatus ().to_string ().c_str (), |
0fab7955 | 3693 | tp->ptid.to_string ().c_str ()); |
372316f1 PA |
3694 | |
3695 | /* Now that we've selected our final event LWP, un-adjust its PC | |
3696 | if it was a software breakpoint (and the target doesn't | |
3697 | always adjust the PC itself). */ | |
1edb66d8 | 3698 | if (tp->stop_reason () == TARGET_STOPPED_BY_SW_BREAKPOINT |
372316f1 PA |
3699 | && !target_supports_stopped_by_sw_breakpoint ()) |
3700 | { | |
3701 | struct regcache *regcache; | |
3702 | struct gdbarch *gdbarch; | |
3703 | int decr_pc; | |
3704 | ||
00431a78 | 3705 | regcache = get_thread_regcache (tp); |
ac7936df | 3706 | gdbarch = regcache->arch (); |
372316f1 PA |
3707 | |
3708 | decr_pc = gdbarch_decr_pc_after_break (gdbarch); | |
3709 | if (decr_pc != 0) | |
3710 | { | |
3711 | CORE_ADDR pc; | |
3712 | ||
3713 | pc = regcache_read_pc (regcache); | |
3714 | regcache_write_pc (regcache, pc + decr_pc); | |
3715 | } | |
3716 | } | |
3717 | ||
1edb66d8 SM |
3718 | tp->set_stop_reason (TARGET_STOPPED_BY_NO_REASON); |
3719 | *status = tp->pending_waitstatus (); | |
3720 | tp->clear_pending_waitstatus (); | |
372316f1 PA |
3721 | |
3722 | /* Wake up the event loop again, until all pending events are | |
3723 | processed. */ | |
3724 | if (target_is_async_p ()) | |
3725 | mark_async_event_handler (infrun_async_inferior_event_token); | |
3726 | return tp->ptid; | |
3727 | } | |
3728 | ||
3729 | /* But if we don't find one, we'll have to wait. */ | |
3730 | ||
d3a07122 SM |
3731 | /* We can't ask a non-async target to do a non-blocking wait, so this will be |
3732 | a blocking wait. */ | |
71247709 | 3733 | if (!target_can_async_p ()) |
d3a07122 SM |
3734 | options &= ~TARGET_WNOHANG; |
3735 | ||
fb85cece | 3736 | return target_wait (ptid, status, options); |
372316f1 PA |
3737 | } |
3738 | ||
5b6d1e4f PA |
3739 | /* Wrapper for target_wait that first checks whether threads have |
3740 | pending statuses to report before actually asking the target for | |
b3e3a4c1 | 3741 | more events. Polls for events from all inferiors/targets. */ |
5b6d1e4f PA |
3742 | |
3743 | static bool | |
ac0d67ed | 3744 | do_target_wait (execution_control_state *ecs, target_wait_flags options) |
5b6d1e4f PA |
3745 | { |
3746 | int num_inferiors = 0; | |
3747 | int random_selector; | |
3748 | ||
b3e3a4c1 SM |
3749 | /* For fairness, we pick the first inferior/target to poll at random |
3750 | out of all inferiors that may report events, and then continue | |
3751 | polling the rest of the inferior list starting from that one in a | |
3752 | circular fashion until the whole list is polled once. */ | |
5b6d1e4f | 3753 | |
ac0d67ed | 3754 | auto inferior_matches = [] (inferior *inf) |
5b6d1e4f | 3755 | { |
ac0d67ed | 3756 | return inf->process_target () != nullptr; |
5b6d1e4f PA |
3757 | }; |
3758 | ||
b3e3a4c1 | 3759 | /* First see how many matching inferiors we have. */ |
5b6d1e4f PA |
3760 | for (inferior *inf : all_inferiors ()) |
3761 | if (inferior_matches (inf)) | |
3762 | num_inferiors++; | |
3763 | ||
3764 | if (num_inferiors == 0) | |
3765 | { | |
183be222 | 3766 | ecs->ws.set_ignore (); |
5b6d1e4f PA |
3767 | return false; |
3768 | } | |
3769 | ||
b3e3a4c1 | 3770 | /* Now randomly pick an inferior out of those that matched. */ |
5b6d1e4f PA |
3771 | random_selector = (int) |
3772 | ((num_inferiors * (double) rand ()) / (RAND_MAX + 1.0)); | |
3773 | ||
1eb8556f SM |
3774 | if (num_inferiors > 1) |
3775 | infrun_debug_printf ("Found %d inferiors, starting at #%d", | |
3776 | num_inferiors, random_selector); | |
5b6d1e4f | 3777 | |
b3e3a4c1 | 3778 | /* Select the Nth inferior that matched. */ |
5b6d1e4f PA |
3779 | |
3780 | inferior *selected = nullptr; | |
3781 | ||
3782 | for (inferior *inf : all_inferiors ()) | |
3783 | if (inferior_matches (inf)) | |
3784 | if (random_selector-- == 0) | |
3785 | { | |
3786 | selected = inf; | |
3787 | break; | |
3788 | } | |
3789 | ||
b3e3a4c1 | 3790 | /* Now poll for events out of each of the matching inferior's |
5b6d1e4f PA |
3791 | targets, starting from the selected one. */ |
3792 | ||
3793 | auto do_wait = [&] (inferior *inf) | |
3794 | { | |
ac0d67ed | 3795 | ecs->ptid = do_target_wait_1 (inf, minus_one_ptid, &ecs->ws, options); |
5b6d1e4f | 3796 | ecs->target = inf->process_target (); |
183be222 | 3797 | return (ecs->ws.kind () != TARGET_WAITKIND_IGNORE); |
5b6d1e4f PA |
3798 | }; |
3799 | ||
b3e3a4c1 SM |
3800 | /* Needed in 'all-stop + target-non-stop' mode, because we end up |
3801 | here spuriously after the target is all stopped and we've already | |
5b6d1e4f PA |
3802 | reported the stop to the user, polling for events. */ |
3803 | scoped_restore_current_thread restore_thread; | |
3804 | ||
08bdefb5 PA |
3805 | intrusive_list_iterator<inferior> start |
3806 | = inferior_list.iterator_to (*selected); | |
3807 | ||
3808 | for (intrusive_list_iterator<inferior> it = start; | |
3809 | it != inferior_list.end (); | |
3810 | ++it) | |
3811 | { | |
3812 | inferior *inf = &*it; | |
3813 | ||
3814 | if (inferior_matches (inf) && do_wait (inf)) | |
5b6d1e4f | 3815 | return true; |
08bdefb5 | 3816 | } |
5b6d1e4f | 3817 | |
08bdefb5 PA |
3818 | for (intrusive_list_iterator<inferior> it = inferior_list.begin (); |
3819 | it != start; | |
3820 | ++it) | |
3821 | { | |
3822 | inferior *inf = &*it; | |
3823 | ||
3824 | if (inferior_matches (inf) && do_wait (inf)) | |
5b6d1e4f | 3825 | return true; |
08bdefb5 | 3826 | } |
5b6d1e4f | 3827 | |
183be222 | 3828 | ecs->ws.set_ignore (); |
5b6d1e4f PA |
3829 | return false; |
3830 | } | |
3831 | ||
8ff53139 PA |
3832 | /* An event reported by wait_one. */ |
3833 | ||
3834 | struct wait_one_event | |
3835 | { | |
3836 | /* The target the event came out of. */ | |
3837 | process_stratum_target *target; | |
3838 | ||
3839 | /* The PTID the event was for. */ | |
3840 | ptid_t ptid; | |
3841 | ||
3842 | /* The waitstatus. */ | |
3843 | target_waitstatus ws; | |
3844 | }; | |
3845 | ||
3846 | static bool handle_one (const wait_one_event &event); | |
3847 | ||
24291992 PA |
3848 | /* Prepare and stabilize the inferior for detaching it. E.g., |
3849 | detaching while a thread is displaced stepping is a recipe for | |
3850 | crashing it, as nothing would readjust the PC out of the scratch | |
3851 | pad. */ | |
3852 | ||
3853 | void | |
3854 | prepare_for_detach (void) | |
3855 | { | |
3856 | struct inferior *inf = current_inferior (); | |
f2907e49 | 3857 | ptid_t pid_ptid = ptid_t (inf->pid); |
8ff53139 | 3858 | scoped_restore_current_thread restore_thread; |
24291992 | 3859 | |
9bcb1f16 | 3860 | scoped_restore restore_detaching = make_scoped_restore (&inf->detaching, true); |
24291992 | 3861 | |
8ff53139 PA |
3862 | /* Remove all threads of INF from the global step-over chain. We |
3863 | want to stop any ongoing step-over, not start any new one. */ | |
8b6a69b2 SM |
3864 | thread_step_over_list_safe_range range |
3865 | = make_thread_step_over_list_safe_range (global_thread_step_over_list); | |
3866 | ||
3867 | for (thread_info *tp : range) | |
3868 | if (tp->inf == inf) | |
3869 | { | |
3870 | infrun_debug_printf ("removing thread %s from global step over chain", | |
0fab7955 | 3871 | tp->ptid.to_string ().c_str ()); |
8ff53139 | 3872 | global_thread_step_over_chain_remove (tp); |
8b6a69b2 | 3873 | } |
24291992 | 3874 | |
ac7d717c PA |
3875 | /* If we were already in the middle of an inline step-over, and the |
3876 | thread stepping belongs to the inferior we're detaching, we need | |
3877 | to restart the threads of other inferiors. */ | |
3878 | if (step_over_info.thread != -1) | |
3879 | { | |
3880 | infrun_debug_printf ("inline step-over in-process while detaching"); | |
3881 | ||
3882 | thread_info *thr = find_thread_global_id (step_over_info.thread); | |
3883 | if (thr->inf == inf) | |
3884 | { | |
3885 | /* Since we removed threads of INF from the step-over chain, | |
3886 | we know this won't start a step-over for INF. */ | |
3887 | clear_step_over_info (); | |
3888 | ||
3889 | if (target_is_non_stop_p ()) | |
3890 | { | |
3891 | /* Start a new step-over in another thread if there's | |
3892 | one that needs it. */ | |
3893 | start_step_over (); | |
3894 | ||
3895 | /* Restart all other threads (except the | |
3896 | previously-stepping thread, since that one is still | |
3897 | running). */ | |
3898 | if (!step_over_info_valid_p ()) | |
3899 | restart_threads (thr); | |
3900 | } | |
3901 | } | |
3902 | } | |
3903 | ||
8ff53139 PA |
3904 | if (displaced_step_in_progress (inf)) |
3905 | { | |
3906 | infrun_debug_printf ("displaced-stepping in-process while detaching"); | |
24291992 | 3907 | |
8ff53139 | 3908 | /* Stop threads currently displaced stepping, aborting it. */ |
24291992 | 3909 | |
8ff53139 PA |
3910 | for (thread_info *thr : inf->non_exited_threads ()) |
3911 | { | |
3912 | if (thr->displaced_step_state.in_progress ()) | |
3913 | { | |
611841bb | 3914 | if (thr->executing ()) |
8ff53139 PA |
3915 | { |
3916 | if (!thr->stop_requested) | |
3917 | { | |
3918 | target_stop (thr->ptid); | |
3919 | thr->stop_requested = true; | |
3920 | } | |
3921 | } | |
3922 | else | |
7846f3aa | 3923 | thr->set_resumed (false); |
8ff53139 PA |
3924 | } |
3925 | } | |
24291992 | 3926 | |
8ff53139 PA |
3927 | while (displaced_step_in_progress (inf)) |
3928 | { | |
3929 | wait_one_event event; | |
24291992 | 3930 | |
8ff53139 PA |
3931 | event.target = inf->process_target (); |
3932 | event.ptid = do_target_wait_1 (inf, pid_ptid, &event.ws, 0); | |
24291992 | 3933 | |
8ff53139 | 3934 | if (debug_infrun) |
c272a98c | 3935 | print_target_wait_results (pid_ptid, event.ptid, event.ws); |
24291992 | 3936 | |
8ff53139 PA |
3937 | handle_one (event); |
3938 | } | |
24291992 | 3939 | |
8ff53139 PA |
3940 | /* It's OK to leave some of the threads of INF stopped, since |
3941 | they'll be detached shortly. */ | |
24291992 | 3942 | } |
24291992 PA |
3943 | } |
3944 | ||
e0c01ce6 PA |
3945 | /* If all-stop, but there exists a non-stop target, stop all threads |
3946 | now that we're presenting the stop to the user. */ | |
3947 | ||
3948 | static void | |
3949 | stop_all_threads_if_all_stop_mode () | |
3950 | { | |
3951 | if (!non_stop && exists_non_stop_target ()) | |
3952 | stop_all_threads ("presenting stop to user in all-stop"); | |
3953 | } | |
3954 | ||
cd0fc7c3 | 3955 | /* Wait for control to return from inferior to debugger. |
ae123ec6 | 3956 | |
cd0fc7c3 SS |
3957 | If inferior gets a signal, we may decide to start it up again |
3958 | instead of returning. That is why there is a loop in this function. | |
3959 | When this function actually returns it means the inferior | |
3960 | should be left stopped and GDB should read more commands. */ | |
3961 | ||
5b6d1e4f PA |
3962 | static void |
3963 | wait_for_inferior (inferior *inf) | |
cd0fc7c3 | 3964 | { |
1eb8556f | 3965 | infrun_debug_printf ("wait_for_inferior ()"); |
527159b7 | 3966 | |
4c41382a | 3967 | SCOPE_EXIT { delete_just_stopped_threads_infrun_breakpoints (); }; |
cd0fc7c3 | 3968 | |
e6f5c25b PA |
3969 | /* If an error happens while handling the event, propagate GDB's |
3970 | knowledge of the executing state to the frontend/user running | |
3971 | state. */ | |
5b6d1e4f PA |
3972 | scoped_finish_thread_state finish_state |
3973 | (inf->process_target (), minus_one_ptid); | |
e6f5c25b | 3974 | |
c906108c SS |
3975 | while (1) |
3976 | { | |
aa563d16 | 3977 | execution_control_state ecs; |
29f49a6a | 3978 | |
ec9499be | 3979 | overlay_cache_invalid = 1; |
ec9499be | 3980 | |
f15cb84a YQ |
3981 | /* Flush target cache before starting to handle each event. |
3982 | Target was running and cache could be stale. This is just a | |
3983 | heuristic. Running threads may modify target memory, but we | |
3984 | don't get any event. */ | |
3985 | target_dcache_invalidate (); | |
3986 | ||
aa563d16 TT |
3987 | ecs.ptid = do_target_wait_1 (inf, minus_one_ptid, &ecs.ws, 0); |
3988 | ecs.target = inf->process_target (); | |
c906108c | 3989 | |
f00150c9 | 3990 | if (debug_infrun) |
aa563d16 | 3991 | print_target_wait_results (minus_one_ptid, ecs.ptid, ecs.ws); |
f00150c9 | 3992 | |
cd0fc7c3 | 3993 | /* Now figure out what to do with the result of the result. */ |
aa563d16 | 3994 | handle_inferior_event (&ecs); |
c906108c | 3995 | |
aa563d16 | 3996 | if (!ecs.wait_some_more) |
cd0fc7c3 SS |
3997 | break; |
3998 | } | |
4e1c45ea | 3999 | |
e0c01ce6 PA |
4000 | stop_all_threads_if_all_stop_mode (); |
4001 | ||
e6f5c25b | 4002 | /* No error, don't finish the state yet. */ |
731f534f | 4003 | finish_state.release (); |
cd0fc7c3 | 4004 | } |
c906108c | 4005 | |
d3d4baed PA |
4006 | /* Cleanup that reinstalls the readline callback handler, if the |
4007 | target is running in the background. If while handling the target | |
4008 | event something triggered a secondary prompt, like e.g., a | |
4009 | pagination prompt, we'll have removed the callback handler (see | |
4010 | gdb_readline_wrapper_line). Need to do this as we go back to the | |
4011 | event loop, ready to process further input. Note this has no | |
4012 | effect if the handler hasn't actually been removed, because calling | |
4013 | rl_callback_handler_install resets the line buffer, thus losing | |
4014 | input. */ | |
4015 | ||
4016 | static void | |
d238133d | 4017 | reinstall_readline_callback_handler_cleanup () |
d3d4baed | 4018 | { |
3b12939d PA |
4019 | struct ui *ui = current_ui; |
4020 | ||
4021 | if (!ui->async) | |
6c400b59 PA |
4022 | { |
4023 | /* We're not going back to the top level event loop yet. Don't | |
4024 | install the readline callback, as it'd prep the terminal, | |
4025 | readline-style (raw, noecho) (e.g., --batch). We'll install | |
4026 | it the next time the prompt is displayed, when we're ready | |
4027 | for input. */ | |
4028 | return; | |
4029 | } | |
4030 | ||
3b12939d | 4031 | if (ui->command_editing && ui->prompt_state != PROMPT_BLOCKED) |
d3d4baed PA |
4032 | gdb_rl_callback_handler_reinstall (); |
4033 | } | |
4034 | ||
243a9253 PA |
4035 | /* Clean up the FSMs of threads that are now stopped. In non-stop, |
4036 | that's just the event thread. In all-stop, that's all threads. */ | |
4037 | ||
4038 | static void | |
4039 | clean_up_just_stopped_threads_fsms (struct execution_control_state *ecs) | |
4040 | { | |
22517040 SM |
4041 | /* The first clean_up call below assumes the event thread is the current |
4042 | one. */ | |
4043 | if (ecs->event_thread != nullptr) | |
4044 | gdb_assert (ecs->event_thread == inferior_thread ()); | |
4045 | ||
573269a8 LS |
4046 | if (ecs->event_thread != nullptr |
4047 | && ecs->event_thread->thread_fsm () != nullptr) | |
4048 | ecs->event_thread->thread_fsm ()->clean_up (ecs->event_thread); | |
243a9253 PA |
4049 | |
4050 | if (!non_stop) | |
4051 | { | |
22517040 SM |
4052 | scoped_restore_current_thread restore_thread; |
4053 | ||
08036331 | 4054 | for (thread_info *thr : all_non_exited_threads ()) |
dda83cd7 | 4055 | { |
573269a8 | 4056 | if (thr->thread_fsm () == nullptr) |
243a9253 PA |
4057 | continue; |
4058 | if (thr == ecs->event_thread) | |
4059 | continue; | |
4060 | ||
00431a78 | 4061 | switch_to_thread (thr); |
573269a8 | 4062 | thr->thread_fsm ()->clean_up (thr); |
243a9253 | 4063 | } |
243a9253 PA |
4064 | } |
4065 | } | |
4066 | ||
3b12939d PA |
4067 | /* Helper for all_uis_check_sync_execution_done that works on the |
4068 | current UI. */ | |
4069 | ||
4070 | static void | |
4071 | check_curr_ui_sync_execution_done (void) | |
4072 | { | |
4073 | struct ui *ui = current_ui; | |
4074 | ||
4075 | if (ui->prompt_state == PROMPT_NEEDED | |
4076 | && ui->async | |
4077 | && !gdb_in_secondary_prompt_p (ui)) | |
4078 | { | |
223ffa71 | 4079 | target_terminal::ours (); |
76727919 | 4080 | gdb::observers::sync_execution_done.notify (); |
8f7f9b3a | 4081 | ui->register_file_handler (); |
3b12939d PA |
4082 | } |
4083 | } | |
4084 | ||
4085 | /* See infrun.h. */ | |
4086 | ||
4087 | void | |
4088 | all_uis_check_sync_execution_done (void) | |
4089 | { | |
0e454242 | 4090 | SWITCH_THRU_ALL_UIS () |
3b12939d PA |
4091 | { |
4092 | check_curr_ui_sync_execution_done (); | |
4093 | } | |
4094 | } | |
4095 | ||
a8836c93 PA |
4096 | /* See infrun.h. */ |
4097 | ||
4098 | void | |
4099 | all_uis_on_sync_execution_starting (void) | |
4100 | { | |
0e454242 | 4101 | SWITCH_THRU_ALL_UIS () |
a8836c93 PA |
4102 | { |
4103 | if (current_ui->prompt_state == PROMPT_NEEDED) | |
4104 | async_disable_stdin (); | |
4105 | } | |
4106 | } | |
4107 | ||
1777feb0 | 4108 | /* Asynchronous version of wait_for_inferior. It is called by the |
43ff13b4 | 4109 | event loop whenever a change of state is detected on the file |
1777feb0 MS |
4110 | descriptor corresponding to the target. It can be called more than |
4111 | once to complete a single execution command. In such cases we need | |
4112 | to keep the state in a global variable ECSS. If it is the last time | |
a474d7c2 PA |
4113 | that this function is called for a single execution command, then |
4114 | report to the user that the inferior has stopped, and do the | |
1777feb0 | 4115 | necessary cleanups. */ |
43ff13b4 JM |
4116 | |
4117 | void | |
b1a35af2 | 4118 | fetch_inferior_event () |
43ff13b4 | 4119 | { |
3ec3145c SM |
4120 | INFRUN_SCOPED_DEBUG_ENTER_EXIT; |
4121 | ||
aa563d16 | 4122 | execution_control_state ecs; |
0f641c01 | 4123 | int cmd_done = 0; |
43ff13b4 | 4124 | |
c61db772 PA |
4125 | /* Events are always processed with the main UI as current UI. This |
4126 | way, warnings, debug output, etc. are always consistently sent to | |
4127 | the main console. */ | |
4b6749b9 | 4128 | scoped_restore save_ui = make_scoped_restore (¤t_ui, main_ui); |
c61db772 | 4129 | |
b78b3a29 TBA |
4130 | /* Temporarily disable pagination. Otherwise, the user would be |
4131 | given an option to press 'q' to quit, which would cause an early | |
4132 | exit and could leave GDB in a half-baked state. */ | |
4133 | scoped_restore save_pagination | |
4134 | = make_scoped_restore (&pagination_enabled, false); | |
4135 | ||
d3d4baed | 4136 | /* End up with readline processing input, if necessary. */ |
d238133d TT |
4137 | { |
4138 | SCOPE_EXIT { reinstall_readline_callback_handler_cleanup (); }; | |
4139 | ||
4140 | /* We're handling a live event, so make sure we're doing live | |
4141 | debugging. If we're looking at traceframes while the target is | |
4142 | running, we're going to need to get back to that mode after | |
4143 | handling the event. */ | |
4144 | gdb::optional<scoped_restore_current_traceframe> maybe_restore_traceframe; | |
4145 | if (non_stop) | |
4146 | { | |
4147 | maybe_restore_traceframe.emplace (); | |
4148 | set_current_traceframe (-1); | |
4149 | } | |
43ff13b4 | 4150 | |
873657b9 PA |
4151 | /* The user/frontend should not notice a thread switch due to |
4152 | internal events. Make sure we revert to the user selected | |
4153 | thread and frame after handling the event and running any | |
4154 | breakpoint commands. */ | |
4155 | scoped_restore_current_thread restore_thread; | |
d238133d TT |
4156 | |
4157 | overlay_cache_invalid = 1; | |
4158 | /* Flush target cache before starting to handle each event. Target | |
4159 | was running and cache could be stale. This is just a heuristic. | |
4160 | Running threads may modify target memory, but we don't get any | |
4161 | event. */ | |
4162 | target_dcache_invalidate (); | |
4163 | ||
4164 | scoped_restore save_exec_dir | |
4165 | = make_scoped_restore (&execution_direction, | |
4166 | target_execution_direction ()); | |
4167 | ||
1192f124 SM |
4168 | /* Allow targets to pause their resumed threads while we handle |
4169 | the event. */ | |
4170 | scoped_disable_commit_resumed disable_commit_resumed ("handling event"); | |
4171 | ||
aa563d16 | 4172 | if (!do_target_wait (&ecs, TARGET_WNOHANG)) |
1192f124 SM |
4173 | { |
4174 | infrun_debug_printf ("do_target_wait returned no event"); | |
4175 | disable_commit_resumed.reset_and_commit (); | |
4176 | return; | |
4177 | } | |
5b6d1e4f | 4178 | |
aa563d16 | 4179 | gdb_assert (ecs.ws.kind () != TARGET_WAITKIND_IGNORE); |
5b6d1e4f PA |
4180 | |
4181 | /* Switch to the target that generated the event, so we can do | |
7f08fd51 | 4182 | target calls. */ |
aa563d16 | 4183 | switch_to_target_no_thread (ecs.target); |
d238133d TT |
4184 | |
4185 | if (debug_infrun) | |
aa563d16 | 4186 | print_target_wait_results (minus_one_ptid, ecs.ptid, ecs.ws); |
d238133d TT |
4187 | |
4188 | /* If an error happens while handling the event, propagate GDB's | |
4189 | knowledge of the executing state to the frontend/user running | |
4190 | state. */ | |
aa563d16 TT |
4191 | ptid_t finish_ptid = !target_is_non_stop_p () ? minus_one_ptid : ecs.ptid; |
4192 | scoped_finish_thread_state finish_state (ecs.target, finish_ptid); | |
d238133d | 4193 | |
979a0d13 | 4194 | /* Get executed before scoped_restore_current_thread above to apply |
d238133d TT |
4195 | still for the thread which has thrown the exception. */ |
4196 | auto defer_bpstat_clear | |
4197 | = make_scope_exit (bpstat_clear_actions); | |
4198 | auto defer_delete_threads | |
4199 | = make_scope_exit (delete_just_stopped_threads_infrun_breakpoints); | |
4200 | ||
4201 | /* Now figure out what to do with the result of the result. */ | |
aa563d16 | 4202 | handle_inferior_event (&ecs); |
d238133d | 4203 | |
aa563d16 | 4204 | if (!ecs.wait_some_more) |
d238133d | 4205 | { |
aa563d16 | 4206 | struct inferior *inf = find_inferior_ptid (ecs.target, ecs.ptid); |
758cb810 | 4207 | bool should_stop = true; |
aa563d16 | 4208 | struct thread_info *thr = ecs.event_thread; |
d6b48e9c | 4209 | |
d238133d | 4210 | delete_just_stopped_threads_infrun_breakpoints (); |
f107f563 | 4211 | |
573269a8 LS |
4212 | if (thr != nullptr && thr->thread_fsm () != nullptr) |
4213 | should_stop = thr->thread_fsm ()->should_stop (thr); | |
243a9253 | 4214 | |
d238133d TT |
4215 | if (!should_stop) |
4216 | { | |
aa563d16 | 4217 | keep_going (&ecs); |
d238133d TT |
4218 | } |
4219 | else | |
4220 | { | |
46e3ed7f | 4221 | bool should_notify_stop = true; |
8dd08de7 | 4222 | bool proceeded = false; |
1840d81a | 4223 | |
e0c01ce6 PA |
4224 | stop_all_threads_if_all_stop_mode (); |
4225 | ||
aa563d16 | 4226 | clean_up_just_stopped_threads_fsms (&ecs); |
243a9253 | 4227 | |
573269a8 LS |
4228 | if (thr != nullptr && thr->thread_fsm () != nullptr) |
4229 | should_notify_stop | |
4230 | = thr->thread_fsm ()->should_notify_stop (); | |
388a7084 | 4231 | |
d238133d TT |
4232 | if (should_notify_stop) |
4233 | { | |
4234 | /* We may not find an inferior if this was a process exit. */ | |
03acd4d8 | 4235 | if (inf == nullptr || inf->control.stop_soon == NO_STOP_QUIETLY) |
d238133d TT |
4236 | proceeded = normal_stop (); |
4237 | } | |
243a9253 | 4238 | |
d238133d TT |
4239 | if (!proceeded) |
4240 | { | |
b1a35af2 | 4241 | inferior_event_handler (INF_EXEC_COMPLETE); |
d238133d TT |
4242 | cmd_done = 1; |
4243 | } | |
873657b9 PA |
4244 | |
4245 | /* If we got a TARGET_WAITKIND_NO_RESUMED event, then the | |
4246 | previously selected thread is gone. We have two | |
4247 | choices - switch to no thread selected, or restore the | |
4248 | previously selected thread (now exited). We chose the | |
4249 | later, just because that's what GDB used to do. After | |
4250 | this, "info threads" says "The current thread <Thread | |
4251 | ID 2> has terminated." instead of "No thread | |
4252 | selected.". */ | |
4253 | if (!non_stop | |
4254 | && cmd_done | |
aa563d16 | 4255 | && ecs.ws.kind () != TARGET_WAITKIND_NO_RESUMED) |
873657b9 | 4256 | restore_thread.dont_restore (); |
d238133d TT |
4257 | } |
4258 | } | |
4f8d22e3 | 4259 | |
d238133d TT |
4260 | defer_delete_threads.release (); |
4261 | defer_bpstat_clear.release (); | |
29f49a6a | 4262 | |
d238133d TT |
4263 | /* No error, don't finish the thread states yet. */ |
4264 | finish_state.release (); | |
731f534f | 4265 | |
1192f124 SM |
4266 | disable_commit_resumed.reset_and_commit (); |
4267 | ||
d238133d TT |
4268 | /* This scope is used to ensure that readline callbacks are |
4269 | reinstalled here. */ | |
4270 | } | |
4f8d22e3 | 4271 | |
152a1749 SM |
4272 | /* Handling this event might have caused some inferiors to become prunable. |
4273 | For example, the exit of an inferior that was automatically added. Try | |
4274 | to get rid of them. Keeping those around slows down things linearly. | |
4275 | ||
4276 | Note that this never removes the current inferior. Therefore, call this | |
4277 | after RESTORE_THREAD went out of scope, in case the event inferior (which was | |
4278 | temporarily made the current inferior) is meant to be deleted. | |
4279 | ||
4280 | Call this before all_uis_check_sync_execution_done, so that notifications about | |
4281 | removed inferiors appear before the prompt. */ | |
4282 | prune_inferiors (); | |
4283 | ||
3b12939d PA |
4284 | /* If a UI was in sync execution mode, and now isn't, restore its |
4285 | prompt (a synchronous execution command has finished, and we're | |
4286 | ready for input). */ | |
4287 | all_uis_check_sync_execution_done (); | |
0f641c01 PA |
4288 | |
4289 | if (cmd_done | |
0f641c01 | 4290 | && exec_done_display_p |
00431a78 PA |
4291 | && (inferior_ptid == null_ptid |
4292 | || inferior_thread ()->state != THREAD_RUNNING)) | |
6cb06a8c | 4293 | gdb_printf (_("completed.\n")); |
43ff13b4 JM |
4294 | } |
4295 | ||
29734269 SM |
4296 | /* See infrun.h. */ |
4297 | ||
edb3359d | 4298 | void |
bd2b40ac | 4299 | set_step_info (thread_info *tp, frame_info_ptr frame, |
29734269 | 4300 | struct symtab_and_line sal) |
edb3359d | 4301 | { |
29734269 SM |
4302 | /* This can be removed once this function no longer implicitly relies on the |
4303 | inferior_ptid value. */ | |
4304 | gdb_assert (inferior_ptid == tp->ptid); | |
edb3359d | 4305 | |
16c381f0 JK |
4306 | tp->control.step_frame_id = get_frame_id (frame); |
4307 | tp->control.step_stack_frame_id = get_stack_frame_id (frame); | |
edb3359d DJ |
4308 | |
4309 | tp->current_symtab = sal.symtab; | |
4310 | tp->current_line = sal.line; | |
c8353d68 AB |
4311 | |
4312 | infrun_debug_printf | |
4313 | ("symtab = %s, line = %d, step_frame_id = %s, step_stack_frame_id = %s", | |
b7e07722 PA |
4314 | tp->current_symtab != nullptr ? tp->current_symtab->filename : "<null>", |
4315 | tp->current_line, | |
c8353d68 AB |
4316 | tp->control.step_frame_id.to_string ().c_str (), |
4317 | tp->control.step_stack_frame_id.to_string ().c_str ()); | |
edb3359d DJ |
4318 | } |
4319 | ||
0d1e5fa7 PA |
4320 | /* Clear context switchable stepping state. */ |
4321 | ||
4322 | void | |
4e1c45ea | 4323 | init_thread_stepping_state (struct thread_info *tss) |
0d1e5fa7 | 4324 | { |
7f5ef605 | 4325 | tss->stepped_breakpoint = 0; |
0d1e5fa7 | 4326 | tss->stepping_over_breakpoint = 0; |
963f9c80 | 4327 | tss->stepping_over_watchpoint = 0; |
0d1e5fa7 | 4328 | tss->step_after_step_resume_breakpoint = 0; |
cd0fc7c3 SS |
4329 | } |
4330 | ||
ab1ddbcf | 4331 | /* See infrun.h. */ |
c32c64b7 | 4332 | |
6efcd9a8 | 4333 | void |
5b6d1e4f | 4334 | set_last_target_status (process_stratum_target *target, ptid_t ptid, |
183be222 | 4335 | const target_waitstatus &status) |
c32c64b7 | 4336 | { |
5b6d1e4f | 4337 | target_last_proc_target = target; |
c32c64b7 DE |
4338 | target_last_wait_ptid = ptid; |
4339 | target_last_waitstatus = status; | |
4340 | } | |
4341 | ||
ab1ddbcf | 4342 | /* See infrun.h. */ |
e02bc4cc DS |
4343 | |
4344 | void | |
5b6d1e4f PA |
4345 | get_last_target_status (process_stratum_target **target, ptid_t *ptid, |
4346 | target_waitstatus *status) | |
e02bc4cc | 4347 | { |
5b6d1e4f PA |
4348 | if (target != nullptr) |
4349 | *target = target_last_proc_target; | |
ab1ddbcf PA |
4350 | if (ptid != nullptr) |
4351 | *ptid = target_last_wait_ptid; | |
4352 | if (status != nullptr) | |
4353 | *status = target_last_waitstatus; | |
e02bc4cc DS |
4354 | } |
4355 | ||
ab1ddbcf PA |
4356 | /* See infrun.h. */ |
4357 | ||
ac264b3b MS |
4358 | void |
4359 | nullify_last_target_wait_ptid (void) | |
4360 | { | |
5b6d1e4f | 4361 | target_last_proc_target = nullptr; |
ac264b3b | 4362 | target_last_wait_ptid = minus_one_ptid; |
ab1ddbcf | 4363 | target_last_waitstatus = {}; |
ac264b3b MS |
4364 | } |
4365 | ||
dcf4fbde | 4366 | /* Switch thread contexts. */ |
dd80620e MS |
4367 | |
4368 | static void | |
00431a78 | 4369 | context_switch (execution_control_state *ecs) |
dd80620e | 4370 | { |
1eb8556f | 4371 | if (ecs->ptid != inferior_ptid |
5b6d1e4f PA |
4372 | && (inferior_ptid == null_ptid |
4373 | || ecs->event_thread != inferior_thread ())) | |
fd48f117 | 4374 | { |
1eb8556f | 4375 | infrun_debug_printf ("Switching context from %s to %s", |
0fab7955 SM |
4376 | inferior_ptid.to_string ().c_str (), |
4377 | ecs->ptid.to_string ().c_str ()); | |
fd48f117 DJ |
4378 | } |
4379 | ||
00431a78 | 4380 | switch_to_thread (ecs->event_thread); |
dd80620e MS |
4381 | } |
4382 | ||
d8dd4d5f PA |
4383 | /* If the target can't tell whether we've hit breakpoints |
4384 | (target_supports_stopped_by_sw_breakpoint), and we got a SIGTRAP, | |
4385 | check whether that could have been caused by a breakpoint. If so, | |
4386 | adjust the PC, per gdbarch_decr_pc_after_break. */ | |
4387 | ||
4fa8626c | 4388 | static void |
d8dd4d5f | 4389 | adjust_pc_after_break (struct thread_info *thread, |
c272a98c | 4390 | const target_waitstatus &ws) |
4fa8626c | 4391 | { |
24a73cce UW |
4392 | struct regcache *regcache; |
4393 | struct gdbarch *gdbarch; | |
118e6252 | 4394 | CORE_ADDR breakpoint_pc, decr_pc; |
4fa8626c | 4395 | |
4fa8626c DJ |
4396 | /* If we've hit a breakpoint, we'll normally be stopped with SIGTRAP. If |
4397 | we aren't, just return. | |
9709f61c DJ |
4398 | |
4399 | We assume that waitkinds other than TARGET_WAITKIND_STOPPED are not | |
b798847d UW |
4400 | affected by gdbarch_decr_pc_after_break. Other waitkinds which are |
4401 | implemented by software breakpoints should be handled through the normal | |
4402 | breakpoint layer. | |
8fb3e588 | 4403 | |
4fa8626c DJ |
4404 | NOTE drow/2004-01-31: On some targets, breakpoints may generate |
4405 | different signals (SIGILL or SIGEMT for instance), but it is less | |
4406 | clear where the PC is pointing afterwards. It may not match | |
b798847d UW |
4407 | gdbarch_decr_pc_after_break. I don't know any specific target that |
4408 | generates these signals at breakpoints (the code has been in GDB since at | |
4409 | least 1992) so I can not guess how to handle them here. | |
8fb3e588 | 4410 | |
e6cf7916 UW |
4411 | In earlier versions of GDB, a target with |
4412 | gdbarch_have_nonsteppable_watchpoint would have the PC after hitting a | |
b798847d UW |
4413 | watchpoint affected by gdbarch_decr_pc_after_break. I haven't found any |
4414 | target with both of these set in GDB history, and it seems unlikely to be | |
4415 | correct, so gdbarch_have_nonsteppable_watchpoint is not checked here. */ | |
4fa8626c | 4416 | |
c272a98c | 4417 | if (ws.kind () != TARGET_WAITKIND_STOPPED) |
4fa8626c DJ |
4418 | return; |
4419 | ||
c272a98c | 4420 | if (ws.sig () != GDB_SIGNAL_TRAP) |
4fa8626c DJ |
4421 | return; |
4422 | ||
4058b839 PA |
4423 | /* In reverse execution, when a breakpoint is hit, the instruction |
4424 | under it has already been de-executed. The reported PC always | |
4425 | points at the breakpoint address, so adjusting it further would | |
4426 | be wrong. E.g., consider this case on a decr_pc_after_break == 1 | |
4427 | architecture: | |
4428 | ||
4429 | B1 0x08000000 : INSN1 | |
4430 | B2 0x08000001 : INSN2 | |
4431 | 0x08000002 : INSN3 | |
4432 | PC -> 0x08000003 : INSN4 | |
4433 | ||
4434 | Say you're stopped at 0x08000003 as above. Reverse continuing | |
4435 | from that point should hit B2 as below. Reading the PC when the | |
4436 | SIGTRAP is reported should read 0x08000001 and INSN2 should have | |
4437 | been de-executed already. | |
4438 | ||
4439 | B1 0x08000000 : INSN1 | |
4440 | B2 PC -> 0x08000001 : INSN2 | |
4441 | 0x08000002 : INSN3 | |
4442 | 0x08000003 : INSN4 | |
4443 | ||
4444 | We can't apply the same logic as for forward execution, because | |
4445 | we would wrongly adjust the PC to 0x08000000, since there's a | |
4446 | breakpoint at PC - 1. We'd then report a hit on B1, although | |
4447 | INSN1 hadn't been de-executed yet. Doing nothing is the correct | |
4448 | behaviour. */ | |
4449 | if (execution_direction == EXEC_REVERSE) | |
4450 | return; | |
4451 | ||
1cf4d951 PA |
4452 | /* If the target can tell whether the thread hit a SW breakpoint, |
4453 | trust it. Targets that can tell also adjust the PC | |
4454 | themselves. */ | |
4455 | if (target_supports_stopped_by_sw_breakpoint ()) | |
4456 | return; | |
4457 | ||
4458 | /* Note that relying on whether a breakpoint is planted in memory to | |
4459 | determine this can fail. E.g,. the breakpoint could have been | |
4460 | removed since. Or the thread could have been told to step an | |
4461 | instruction the size of a breakpoint instruction, and only | |
4462 | _after_ was a breakpoint inserted at its address. */ | |
4463 | ||
24a73cce UW |
4464 | /* If this target does not decrement the PC after breakpoints, then |
4465 | we have nothing to do. */ | |
00431a78 | 4466 | regcache = get_thread_regcache (thread); |
ac7936df | 4467 | gdbarch = regcache->arch (); |
118e6252 | 4468 | |
527a273a | 4469 | decr_pc = gdbarch_decr_pc_after_break (gdbarch); |
118e6252 | 4470 | if (decr_pc == 0) |
24a73cce UW |
4471 | return; |
4472 | ||
8b86c959 | 4473 | const address_space *aspace = regcache->aspace (); |
6c95b8df | 4474 | |
8aad930b AC |
4475 | /* Find the location where (if we've hit a breakpoint) the |
4476 | breakpoint would be. */ | |
118e6252 | 4477 | breakpoint_pc = regcache_read_pc (regcache) - decr_pc; |
8aad930b | 4478 | |
1cf4d951 PA |
4479 | /* If the target can't tell whether a software breakpoint triggered, |
4480 | fallback to figuring it out based on breakpoints we think were | |
4481 | inserted in the target, and on whether the thread was stepped or | |
4482 | continued. */ | |
4483 | ||
1c5cfe86 PA |
4484 | /* Check whether there actually is a software breakpoint inserted at |
4485 | that location. | |
4486 | ||
4487 | If in non-stop mode, a race condition is possible where we've | |
4488 | removed a breakpoint, but stop events for that breakpoint were | |
4489 | already queued and arrive later. To suppress those spurious | |
4490 | SIGTRAPs, we keep a list of such breakpoint locations for a bit, | |
1cf4d951 PA |
4491 | and retire them after a number of stop events are reported. Note |
4492 | this is an heuristic and can thus get confused. The real fix is | |
4493 | to get the "stopped by SW BP and needs adjustment" info out of | |
4494 | the target/kernel (and thus never reach here; see above). */ | |
6c95b8df | 4495 | if (software_breakpoint_inserted_here_p (aspace, breakpoint_pc) |
fbea99ea PA |
4496 | || (target_is_non_stop_p () |
4497 | && moribund_breakpoint_here_p (aspace, breakpoint_pc))) | |
8aad930b | 4498 | { |
07036511 | 4499 | gdb::optional<scoped_restore_tmpl<int>> restore_operation_disable; |
abbb1732 | 4500 | |
8213266a | 4501 | if (record_full_is_used ()) |
07036511 TT |
4502 | restore_operation_disable.emplace |
4503 | (record_full_gdb_operation_disable_set ()); | |
96429cc8 | 4504 | |
1c0fdd0e UW |
4505 | /* When using hardware single-step, a SIGTRAP is reported for both |
4506 | a completed single-step and a software breakpoint. Need to | |
4507 | differentiate between the two, as the latter needs adjusting | |
4508 | but the former does not. | |
4509 | ||
4510 | The SIGTRAP can be due to a completed hardware single-step only if | |
4511 | - we didn't insert software single-step breakpoints | |
1c0fdd0e UW |
4512 | - this thread is currently being stepped |
4513 | ||
4514 | If any of these events did not occur, we must have stopped due | |
4515 | to hitting a software breakpoint, and have to back up to the | |
4516 | breakpoint address. | |
4517 | ||
4518 | As a special case, we could have hardware single-stepped a | |
4519 | software breakpoint. In this case (prev_pc == breakpoint_pc), | |
4520 | we also need to back up to the breakpoint address. */ | |
4521 | ||
d8dd4d5f PA |
4522 | if (thread_has_single_step_breakpoints_set (thread) |
4523 | || !currently_stepping (thread) | |
4524 | || (thread->stepped_breakpoint | |
4525 | && thread->prev_pc == breakpoint_pc)) | |
515630c5 | 4526 | regcache_write_pc (regcache, breakpoint_pc); |
8aad930b | 4527 | } |
4fa8626c DJ |
4528 | } |
4529 | ||
c4464ade | 4530 | static bool |
bd2b40ac | 4531 | stepped_in_from (frame_info_ptr frame, struct frame_id step_frame_id) |
edb3359d DJ |
4532 | { |
4533 | for (frame = get_prev_frame (frame); | |
03acd4d8 | 4534 | frame != nullptr; |
edb3359d DJ |
4535 | frame = get_prev_frame (frame)) |
4536 | { | |
a0cbd650 | 4537 | if (get_frame_id (frame) == step_frame_id) |
c4464ade SM |
4538 | return true; |
4539 | ||
edb3359d DJ |
4540 | if (get_frame_type (frame) != INLINE_FRAME) |
4541 | break; | |
4542 | } | |
4543 | ||
c4464ade | 4544 | return false; |
edb3359d DJ |
4545 | } |
4546 | ||
4a4c04f1 BE |
4547 | /* Look for an inline frame that is marked for skip. |
4548 | If PREV_FRAME is TRUE start at the previous frame, | |
4549 | otherwise start at the current frame. Stop at the | |
4550 | first non-inline frame, or at the frame where the | |
4551 | step started. */ | |
4552 | ||
4553 | static bool | |
4554 | inline_frame_is_marked_for_skip (bool prev_frame, struct thread_info *tp) | |
4555 | { | |
bd2b40ac | 4556 | frame_info_ptr frame = get_current_frame (); |
4a4c04f1 BE |
4557 | |
4558 | if (prev_frame) | |
4559 | frame = get_prev_frame (frame); | |
4560 | ||
03acd4d8 | 4561 | for (; frame != nullptr; frame = get_prev_frame (frame)) |
4a4c04f1 | 4562 | { |
03acd4d8 | 4563 | const char *fn = nullptr; |
4a4c04f1 BE |
4564 | symtab_and_line sal; |
4565 | struct symbol *sym; | |
4566 | ||
a0cbd650 | 4567 | if (get_frame_id (frame) == tp->control.step_frame_id) |
4a4c04f1 BE |
4568 | break; |
4569 | if (get_frame_type (frame) != INLINE_FRAME) | |
4570 | break; | |
4571 | ||
4572 | sal = find_frame_sal (frame); | |
4573 | sym = get_frame_function (frame); | |
4574 | ||
03acd4d8 | 4575 | if (sym != nullptr) |
4a4c04f1 BE |
4576 | fn = sym->print_name (); |
4577 | ||
4578 | if (sal.line != 0 | |
4579 | && function_name_is_marked_for_skip (fn, sal)) | |
4580 | return true; | |
4581 | } | |
4582 | ||
4583 | return false; | |
4584 | } | |
4585 | ||
c65d6b55 PA |
4586 | /* If the event thread has the stop requested flag set, pretend it |
4587 | stopped for a GDB_SIGNAL_0 (i.e., as if it stopped due to | |
4588 | target_stop). */ | |
4589 | ||
4590 | static bool | |
4591 | handle_stop_requested (struct execution_control_state *ecs) | |
4592 | { | |
4593 | if (ecs->event_thread->stop_requested) | |
4594 | { | |
183be222 | 4595 | ecs->ws.set_stopped (GDB_SIGNAL_0); |
c65d6b55 PA |
4596 | handle_signal_stop (ecs); |
4597 | return true; | |
4598 | } | |
4599 | return false; | |
4600 | } | |
4601 | ||
a96d9b2e | 4602 | /* Auxiliary function that handles syscall entry/return events. |
c4464ade SM |
4603 | It returns true if the inferior should keep going (and GDB |
4604 | should ignore the event), or false if the event deserves to be | |
a96d9b2e | 4605 | processed. */ |
ca2163eb | 4606 | |
c4464ade | 4607 | static bool |
ca2163eb | 4608 | handle_syscall_event (struct execution_control_state *ecs) |
a96d9b2e | 4609 | { |
ca2163eb | 4610 | struct regcache *regcache; |
ca2163eb PA |
4611 | int syscall_number; |
4612 | ||
00431a78 | 4613 | context_switch (ecs); |
ca2163eb | 4614 | |
00431a78 | 4615 | regcache = get_thread_regcache (ecs->event_thread); |
183be222 | 4616 | syscall_number = ecs->ws.syscall_number (); |
1edb66d8 | 4617 | ecs->event_thread->set_stop_pc (regcache_read_pc (regcache)); |
ca2163eb | 4618 | |
a96d9b2e | 4619 | if (catch_syscall_enabled () > 0 |
9fe3819e | 4620 | && catching_syscall_number (syscall_number)) |
a96d9b2e | 4621 | { |
1eb8556f | 4622 | infrun_debug_printf ("syscall number=%d", syscall_number); |
a96d9b2e | 4623 | |
16c381f0 | 4624 | ecs->event_thread->control.stop_bpstat |
d37e0847 PA |
4625 | = bpstat_stop_status_nowatch (regcache->aspace (), |
4626 | ecs->event_thread->stop_pc (), | |
4627 | ecs->event_thread, ecs->ws); | |
ab04a2af | 4628 | |
c65d6b55 | 4629 | if (handle_stop_requested (ecs)) |
c4464ade | 4630 | return false; |
c65d6b55 | 4631 | |
ce12b012 | 4632 | if (bpstat_causes_stop (ecs->event_thread->control.stop_bpstat)) |
ca2163eb PA |
4633 | { |
4634 | /* Catchpoint hit. */ | |
c4464ade | 4635 | return false; |
ca2163eb | 4636 | } |
a96d9b2e | 4637 | } |
ca2163eb | 4638 | |
c65d6b55 | 4639 | if (handle_stop_requested (ecs)) |
c4464ade | 4640 | return false; |
c65d6b55 | 4641 | |
ca2163eb | 4642 | /* If no catchpoint triggered for this, then keep going. */ |
ca2163eb | 4643 | keep_going (ecs); |
c4464ade SM |
4644 | |
4645 | return true; | |
a96d9b2e SDJ |
4646 | } |
4647 | ||
7e324e48 GB |
4648 | /* Lazily fill in the execution_control_state's stop_func_* fields. */ |
4649 | ||
4650 | static void | |
4651 | fill_in_stop_func (struct gdbarch *gdbarch, | |
4652 | struct execution_control_state *ecs) | |
4653 | { | |
4654 | if (!ecs->stop_func_filled_in) | |
4655 | { | |
98a617f8 | 4656 | const block *block; |
fe830662 | 4657 | const general_symbol_info *gsi; |
98a617f8 | 4658 | |
7e324e48 GB |
4659 | /* Don't care about return value; stop_func_start and stop_func_name |
4660 | will both be 0 if it doesn't work. */ | |
1edb66d8 | 4661 | find_pc_partial_function_sym (ecs->event_thread->stop_pc (), |
fe830662 TT |
4662 | &gsi, |
4663 | &ecs->stop_func_start, | |
4664 | &ecs->stop_func_end, | |
4665 | &block); | |
4666 | ecs->stop_func_name = gsi == nullptr ? nullptr : gsi->print_name (); | |
98a617f8 KB |
4667 | |
4668 | /* The call to find_pc_partial_function, above, will set | |
4669 | stop_func_start and stop_func_end to the start and end | |
4670 | of the range containing the stop pc. If this range | |
4671 | contains the entry pc for the block (which is always the | |
4672 | case for contiguous blocks), advance stop_func_start past | |
4673 | the function's start offset and entrypoint. Note that | |
4674 | stop_func_start is NOT advanced when in a range of a | |
4675 | non-contiguous block that does not contain the entry pc. */ | |
4676 | if (block != nullptr | |
6395b628 SM |
4677 | && ecs->stop_func_start <= block->entry_pc () |
4678 | && block->entry_pc () < ecs->stop_func_end) | |
98a617f8 KB |
4679 | { |
4680 | ecs->stop_func_start | |
4681 | += gdbarch_deprecated_function_start_offset (gdbarch); | |
4682 | ||
4683 | if (gdbarch_skip_entrypoint_p (gdbarch)) | |
4684 | ecs->stop_func_start | |
4685 | = gdbarch_skip_entrypoint (gdbarch, ecs->stop_func_start); | |
4686 | } | |
591a12a1 | 4687 | |
7e324e48 GB |
4688 | ecs->stop_func_filled_in = 1; |
4689 | } | |
4690 | } | |
4691 | ||
4f5d7f63 | 4692 | |
00431a78 | 4693 | /* Return the STOP_SOON field of the inferior pointed at by ECS. */ |
4f5d7f63 PA |
4694 | |
4695 | static enum stop_kind | |
00431a78 | 4696 | get_inferior_stop_soon (execution_control_state *ecs) |
4f5d7f63 | 4697 | { |
5b6d1e4f | 4698 | struct inferior *inf = find_inferior_ptid (ecs->target, ecs->ptid); |
4f5d7f63 | 4699 | |
03acd4d8 | 4700 | gdb_assert (inf != nullptr); |
4f5d7f63 PA |
4701 | return inf->control.stop_soon; |
4702 | } | |
4703 | ||
5b6d1e4f PA |
4704 | /* Poll for one event out of the current target. Store the resulting |
4705 | waitstatus in WS, and return the event ptid. Does not block. */ | |
372316f1 PA |
4706 | |
4707 | static ptid_t | |
5b6d1e4f | 4708 | poll_one_curr_target (struct target_waitstatus *ws) |
372316f1 PA |
4709 | { |
4710 | ptid_t event_ptid; | |
372316f1 PA |
4711 | |
4712 | overlay_cache_invalid = 1; | |
4713 | ||
4714 | /* Flush target cache before starting to handle each event. | |
4715 | Target was running and cache could be stale. This is just a | |
4716 | heuristic. Running threads may modify target memory, but we | |
4717 | don't get any event. */ | |
4718 | target_dcache_invalidate (); | |
4719 | ||
fb85cece | 4720 | event_ptid = target_wait (minus_one_ptid, ws, TARGET_WNOHANG); |
372316f1 PA |
4721 | |
4722 | if (debug_infrun) | |
c272a98c | 4723 | print_target_wait_results (minus_one_ptid, event_ptid, *ws); |
372316f1 PA |
4724 | |
4725 | return event_ptid; | |
4726 | } | |
4727 | ||
5b6d1e4f PA |
4728 | /* Wait for one event out of any target. */ |
4729 | ||
4730 | static wait_one_event | |
4731 | wait_one () | |
4732 | { | |
4733 | while (1) | |
4734 | { | |
4735 | for (inferior *inf : all_inferiors ()) | |
4736 | { | |
4737 | process_stratum_target *target = inf->process_target (); | |
03acd4d8 | 4738 | if (target == nullptr |
5b6d1e4f PA |
4739 | || !target->is_async_p () |
4740 | || !target->threads_executing) | |
4741 | continue; | |
4742 | ||
4743 | switch_to_inferior_no_thread (inf); | |
4744 | ||
4745 | wait_one_event event; | |
4746 | event.target = target; | |
4747 | event.ptid = poll_one_curr_target (&event.ws); | |
4748 | ||
183be222 | 4749 | if (event.ws.kind () == TARGET_WAITKIND_NO_RESUMED) |
5b6d1e4f PA |
4750 | { |
4751 | /* If nothing is resumed, remove the target from the | |
4752 | event loop. */ | |
4a570176 | 4753 | target_async (false); |
5b6d1e4f | 4754 | } |
183be222 | 4755 | else if (event.ws.kind () != TARGET_WAITKIND_IGNORE) |
5b6d1e4f PA |
4756 | return event; |
4757 | } | |
4758 | ||
4759 | /* Block waiting for some event. */ | |
4760 | ||
4761 | fd_set readfds; | |
4762 | int nfds = 0; | |
4763 | ||
4764 | FD_ZERO (&readfds); | |
4765 | ||
4766 | for (inferior *inf : all_inferiors ()) | |
4767 | { | |
4768 | process_stratum_target *target = inf->process_target (); | |
03acd4d8 | 4769 | if (target == nullptr |
5b6d1e4f PA |
4770 | || !target->is_async_p () |
4771 | || !target->threads_executing) | |
4772 | continue; | |
4773 | ||
4774 | int fd = target->async_wait_fd (); | |
4775 | FD_SET (fd, &readfds); | |
4776 | if (nfds <= fd) | |
4777 | nfds = fd + 1; | |
4778 | } | |
4779 | ||
4780 | if (nfds == 0) | |
4781 | { | |
4782 | /* No waitable targets left. All must be stopped. */ | |
183be222 SM |
4783 | target_waitstatus ws; |
4784 | ws.set_no_resumed (); | |
03acd4d8 | 4785 | return {nullptr, minus_one_ptid, std::move (ws)}; |
5b6d1e4f PA |
4786 | } |
4787 | ||
4788 | QUIT; | |
4789 | ||
03acd4d8 | 4790 | int numfds = interruptible_select (nfds, &readfds, 0, nullptr, 0); |
5b6d1e4f PA |
4791 | if (numfds < 0) |
4792 | { | |
4793 | if (errno == EINTR) | |
4794 | continue; | |
4795 | else | |
4796 | perror_with_name ("interruptible_select"); | |
4797 | } | |
4798 | } | |
4799 | } | |
4800 | ||
372316f1 PA |
4801 | /* Save the thread's event and stop reason to process it later. */ |
4802 | ||
4803 | static void | |
c272a98c | 4804 | save_waitstatus (struct thread_info *tp, const target_waitstatus &ws) |
372316f1 | 4805 | { |
96bbe3ef | 4806 | infrun_debug_printf ("saving status %s for %s", |
c272a98c | 4807 | ws.to_string ().c_str (), |
96bbe3ef | 4808 | tp->ptid.to_string ().c_str ()); |
372316f1 PA |
4809 | |
4810 | /* Record for later. */ | |
c272a98c | 4811 | tp->set_pending_waitstatus (ws); |
372316f1 | 4812 | |
c272a98c SM |
4813 | if (ws.kind () == TARGET_WAITKIND_STOPPED |
4814 | && ws.sig () == GDB_SIGNAL_TRAP) | |
372316f1 | 4815 | { |
89ba430c SM |
4816 | struct regcache *regcache = get_thread_regcache (tp); |
4817 | const address_space *aspace = regcache->aspace (); | |
372316f1 PA |
4818 | CORE_ADDR pc = regcache_read_pc (regcache); |
4819 | ||
c272a98c | 4820 | adjust_pc_after_break (tp, tp->pending_waitstatus ()); |
372316f1 | 4821 | |
18493a00 PA |
4822 | scoped_restore_current_thread restore_thread; |
4823 | switch_to_thread (tp); | |
4824 | ||
4825 | if (target_stopped_by_watchpoint ()) | |
1edb66d8 | 4826 | tp->set_stop_reason (TARGET_STOPPED_BY_WATCHPOINT); |
372316f1 | 4827 | else if (target_supports_stopped_by_sw_breakpoint () |
18493a00 | 4828 | && target_stopped_by_sw_breakpoint ()) |
1edb66d8 | 4829 | tp->set_stop_reason (TARGET_STOPPED_BY_SW_BREAKPOINT); |
372316f1 | 4830 | else if (target_supports_stopped_by_hw_breakpoint () |
18493a00 | 4831 | && target_stopped_by_hw_breakpoint ()) |
1edb66d8 | 4832 | tp->set_stop_reason (TARGET_STOPPED_BY_HW_BREAKPOINT); |
372316f1 | 4833 | else if (!target_supports_stopped_by_hw_breakpoint () |
1edb66d8 SM |
4834 | && hardware_breakpoint_inserted_here_p (aspace, pc)) |
4835 | tp->set_stop_reason (TARGET_STOPPED_BY_HW_BREAKPOINT); | |
372316f1 | 4836 | else if (!target_supports_stopped_by_sw_breakpoint () |
1edb66d8 SM |
4837 | && software_breakpoint_inserted_here_p (aspace, pc)) |
4838 | tp->set_stop_reason (TARGET_STOPPED_BY_SW_BREAKPOINT); | |
372316f1 PA |
4839 | else if (!thread_has_single_step_breakpoints_set (tp) |
4840 | && currently_stepping (tp)) | |
1edb66d8 | 4841 | tp->set_stop_reason (TARGET_STOPPED_BY_SINGLE_STEP); |
372316f1 PA |
4842 | } |
4843 | } | |
4844 | ||
293b3ebc TBA |
4845 | /* Mark the non-executing threads accordingly. In all-stop, all |
4846 | threads of all processes are stopped when we get any event | |
4847 | reported. In non-stop mode, only the event thread stops. */ | |
4848 | ||
4849 | static void | |
4850 | mark_non_executing_threads (process_stratum_target *target, | |
4851 | ptid_t event_ptid, | |
183be222 | 4852 | const target_waitstatus &ws) |
293b3ebc TBA |
4853 | { |
4854 | ptid_t mark_ptid; | |
4855 | ||
4856 | if (!target_is_non_stop_p ()) | |
4857 | mark_ptid = minus_one_ptid; | |
183be222 SM |
4858 | else if (ws.kind () == TARGET_WAITKIND_SIGNALLED |
4859 | || ws.kind () == TARGET_WAITKIND_EXITED) | |
293b3ebc TBA |
4860 | { |
4861 | /* If we're handling a process exit in non-stop mode, even | |
4862 | though threads haven't been deleted yet, one would think | |
4863 | that there is nothing to do, as threads of the dead process | |
4864 | will be soon deleted, and threads of any other process were | |
4865 | left running. However, on some targets, threads survive a | |
4866 | process exit event. E.g., for the "checkpoint" command, | |
4867 | when the current checkpoint/fork exits, linux-fork.c | |
4868 | automatically switches to another fork from within | |
4869 | target_mourn_inferior, by associating the same | |
4870 | inferior/thread to another fork. We haven't mourned yet at | |
4871 | this point, but we must mark any threads left in the | |
4872 | process as not-executing so that finish_thread_state marks | |
4873 | them stopped (in the user's perspective) if/when we present | |
4874 | the stop to the user. */ | |
4875 | mark_ptid = ptid_t (event_ptid.pid ()); | |
4876 | } | |
4877 | else | |
4878 | mark_ptid = event_ptid; | |
4879 | ||
4880 | set_executing (target, mark_ptid, false); | |
4881 | ||
4882 | /* Likewise the resumed flag. */ | |
4883 | set_resumed (target, mark_ptid, false); | |
4884 | } | |
4885 | ||
d758e62c PA |
4886 | /* Handle one event after stopping threads. If the eventing thread |
4887 | reports back any interesting event, we leave it pending. If the | |
4888 | eventing thread was in the middle of a displaced step, we | |
8ff53139 PA |
4889 | cancel/finish it, and unless the thread's inferior is being |
4890 | detached, put the thread back in the step-over chain. Returns true | |
4891 | if there are no resumed threads left in the target (thus there's no | |
4892 | point in waiting further), false otherwise. */ | |
d758e62c PA |
4893 | |
4894 | static bool | |
4895 | handle_one (const wait_one_event &event) | |
4896 | { | |
4897 | infrun_debug_printf | |
7dca2ea7 | 4898 | ("%s %s", event.ws.to_string ().c_str (), |
0fab7955 | 4899 | event.ptid.to_string ().c_str ()); |
d758e62c | 4900 | |
183be222 | 4901 | if (event.ws.kind () == TARGET_WAITKIND_NO_RESUMED) |
d758e62c PA |
4902 | { |
4903 | /* All resumed threads exited. */ | |
4904 | return true; | |
4905 | } | |
183be222 SM |
4906 | else if (event.ws.kind () == TARGET_WAITKIND_THREAD_EXITED |
4907 | || event.ws.kind () == TARGET_WAITKIND_EXITED | |
4908 | || event.ws.kind () == TARGET_WAITKIND_SIGNALLED) | |
d758e62c PA |
4909 | { |
4910 | /* One thread/process exited/signalled. */ | |
4911 | ||
4912 | thread_info *t = nullptr; | |
4913 | ||
4914 | /* The target may have reported just a pid. If so, try | |
4915 | the first non-exited thread. */ | |
4916 | if (event.ptid.is_pid ()) | |
4917 | { | |
4918 | int pid = event.ptid.pid (); | |
4919 | inferior *inf = find_inferior_pid (event.target, pid); | |
4920 | for (thread_info *tp : inf->non_exited_threads ()) | |
4921 | { | |
4922 | t = tp; | |
4923 | break; | |
4924 | } | |
4925 | ||
4926 | /* If there is no available thread, the event would | |
4927 | have to be appended to a per-inferior event list, | |
4928 | which does not exist (and if it did, we'd have | |
4929 | to adjust run control command to be able to | |
4930 | resume such an inferior). We assert here instead | |
4931 | of going into an infinite loop. */ | |
4932 | gdb_assert (t != nullptr); | |
4933 | ||
4934 | infrun_debug_printf | |
0fab7955 | 4935 | ("using %s", t->ptid.to_string ().c_str ()); |
d758e62c PA |
4936 | } |
4937 | else | |
4938 | { | |
4939 | t = find_thread_ptid (event.target, event.ptid); | |
4940 | /* Check if this is the first time we see this thread. | |
4941 | Don't bother adding if it individually exited. */ | |
4942 | if (t == nullptr | |
183be222 | 4943 | && event.ws.kind () != TARGET_WAITKIND_THREAD_EXITED) |
d758e62c PA |
4944 | t = add_thread (event.target, event.ptid); |
4945 | } | |
4946 | ||
4947 | if (t != nullptr) | |
4948 | { | |
4949 | /* Set the threads as non-executing to avoid | |
4950 | another stop attempt on them. */ | |
4951 | switch_to_thread_no_regs (t); | |
4952 | mark_non_executing_threads (event.target, event.ptid, | |
4953 | event.ws); | |
c272a98c | 4954 | save_waitstatus (t, event.ws); |
d758e62c PA |
4955 | t->stop_requested = false; |
4956 | } | |
4957 | } | |
4958 | else | |
4959 | { | |
4960 | thread_info *t = find_thread_ptid (event.target, event.ptid); | |
03acd4d8 | 4961 | if (t == nullptr) |
d758e62c PA |
4962 | t = add_thread (event.target, event.ptid); |
4963 | ||
4964 | t->stop_requested = 0; | |
611841bb | 4965 | t->set_executing (false); |
7846f3aa | 4966 | t->set_resumed (false); |
d758e62c PA |
4967 | t->control.may_range_step = 0; |
4968 | ||
4969 | /* This may be the first time we see the inferior report | |
4970 | a stop. */ | |
3db13541 | 4971 | if (t->inf->needs_setup) |
d758e62c PA |
4972 | { |
4973 | switch_to_thread_no_regs (t); | |
4974 | setup_inferior (0); | |
4975 | } | |
4976 | ||
183be222 SM |
4977 | if (event.ws.kind () == TARGET_WAITKIND_STOPPED |
4978 | && event.ws.sig () == GDB_SIGNAL_0) | |
d758e62c PA |
4979 | { |
4980 | /* We caught the event that we intended to catch, so | |
1edb66d8 | 4981 | there's no event to save as pending. */ |
d758e62c PA |
4982 | |
4983 | if (displaced_step_finish (t, GDB_SIGNAL_0) | |
4984 | == DISPLACED_STEP_FINISH_STATUS_NOT_EXECUTED) | |
4985 | { | |
4986 | /* Add it back to the step-over queue. */ | |
4987 | infrun_debug_printf | |
4988 | ("displaced-step of %s canceled", | |
0fab7955 | 4989 | t->ptid.to_string ().c_str ()); |
d758e62c PA |
4990 | |
4991 | t->control.trap_expected = 0; | |
8ff53139 PA |
4992 | if (!t->inf->detaching) |
4993 | global_thread_step_over_chain_enqueue (t); | |
d758e62c PA |
4994 | } |
4995 | } | |
4996 | else | |
4997 | { | |
4998 | enum gdb_signal sig; | |
4999 | struct regcache *regcache; | |
5000 | ||
5001 | infrun_debug_printf | |
96bbe3ef | 5002 | ("target_wait %s, saving status for %s", |
7dca2ea7 | 5003 | event.ws.to_string ().c_str (), |
96bbe3ef | 5004 | t->ptid.to_string ().c_str ()); |
d758e62c PA |
5005 | |
5006 | /* Record for later. */ | |
c272a98c | 5007 | save_waitstatus (t, event.ws); |
d758e62c | 5008 | |
183be222 SM |
5009 | sig = (event.ws.kind () == TARGET_WAITKIND_STOPPED |
5010 | ? event.ws.sig () : GDB_SIGNAL_0); | |
d758e62c PA |
5011 | |
5012 | if (displaced_step_finish (t, sig) | |
5013 | == DISPLACED_STEP_FINISH_STATUS_NOT_EXECUTED) | |
5014 | { | |
5015 | /* Add it back to the step-over queue. */ | |
5016 | t->control.trap_expected = 0; | |
8ff53139 PA |
5017 | if (!t->inf->detaching) |
5018 | global_thread_step_over_chain_enqueue (t); | |
d758e62c PA |
5019 | } |
5020 | ||
5021 | regcache = get_thread_regcache (t); | |
1edb66d8 | 5022 | t->set_stop_pc (regcache_read_pc (regcache)); |
d758e62c PA |
5023 | |
5024 | infrun_debug_printf ("saved stop_pc=%s for %s " | |
5025 | "(currently_stepping=%d)", | |
1edb66d8 | 5026 | paddress (target_gdbarch (), t->stop_pc ()), |
0fab7955 | 5027 | t->ptid.to_string ().c_str (), |
d758e62c PA |
5028 | currently_stepping (t)); |
5029 | } | |
5030 | } | |
5031 | ||
5032 | return false; | |
5033 | } | |
5034 | ||
6efcd9a8 | 5035 | /* See infrun.h. */ |
372316f1 | 5036 | |
6efcd9a8 | 5037 | void |
148cf134 | 5038 | stop_all_threads (const char *reason, inferior *inf) |
372316f1 PA |
5039 | { |
5040 | /* We may need multiple passes to discover all threads. */ | |
5041 | int pass; | |
5042 | int iterations = 0; | |
372316f1 | 5043 | |
53cccef1 | 5044 | gdb_assert (exists_non_stop_target ()); |
372316f1 | 5045 | |
148cf134 SM |
5046 | INFRUN_SCOPED_DEBUG_START_END ("reason=%s, inf=%d", reason, |
5047 | inf != nullptr ? inf->num : -1); | |
372316f1 | 5048 | |
1f9d9e32 AB |
5049 | infrun_debug_show_threads ("non-exited threads", |
5050 | all_non_exited_threads ()); | |
5051 | ||
00431a78 | 5052 | scoped_restore_current_thread restore_thread; |
372316f1 | 5053 | |
148cf134 | 5054 | /* Enable thread events on relevant targets. */ |
6ad82919 TBA |
5055 | for (auto *target : all_non_exited_process_targets ()) |
5056 | { | |
148cf134 SM |
5057 | if (inf != nullptr && inf->process_target () != target) |
5058 | continue; | |
5059 | ||
6ad82919 TBA |
5060 | switch_to_target_no_thread (target); |
5061 | target_thread_events (true); | |
5062 | } | |
5063 | ||
5064 | SCOPE_EXIT | |
5065 | { | |
148cf134 | 5066 | /* Disable thread events on relevant targets. */ |
6ad82919 TBA |
5067 | for (auto *target : all_non_exited_process_targets ()) |
5068 | { | |
148cf134 SM |
5069 | if (inf != nullptr && inf->process_target () != target) |
5070 | continue; | |
5071 | ||
6ad82919 TBA |
5072 | switch_to_target_no_thread (target); |
5073 | target_thread_events (false); | |
5074 | } | |
5075 | ||
17417fb0 | 5076 | /* Use debug_prefixed_printf directly to get a meaningful function |
dda83cd7 | 5077 | name. */ |
6ad82919 | 5078 | if (debug_infrun) |
17417fb0 | 5079 | debug_prefixed_printf ("infrun", "stop_all_threads", "done"); |
6ad82919 | 5080 | }; |
65706a29 | 5081 | |
372316f1 PA |
5082 | /* Request threads to stop, and then wait for the stops. Because |
5083 | threads we already know about can spawn more threads while we're | |
5084 | trying to stop them, and we only learn about new threads when we | |
5085 | update the thread list, do this in a loop, and keep iterating | |
5086 | until two passes find no threads that need to be stopped. */ | |
5087 | for (pass = 0; pass < 2; pass++, iterations++) | |
5088 | { | |
1eb8556f | 5089 | infrun_debug_printf ("pass=%d, iterations=%d", pass, iterations); |
372316f1 PA |
5090 | while (1) |
5091 | { | |
29d6859f | 5092 | int waits_needed = 0; |
372316f1 | 5093 | |
a05575d3 TBA |
5094 | for (auto *target : all_non_exited_process_targets ()) |
5095 | { | |
148cf134 SM |
5096 | if (inf != nullptr && inf->process_target () != target) |
5097 | continue; | |
5098 | ||
a05575d3 TBA |
5099 | switch_to_target_no_thread (target); |
5100 | update_thread_list (); | |
5101 | } | |
372316f1 PA |
5102 | |
5103 | /* Go through all threads looking for threads that we need | |
5104 | to tell the target to stop. */ | |
08036331 | 5105 | for (thread_info *t : all_non_exited_threads ()) |
372316f1 | 5106 | { |
148cf134 SM |
5107 | if (inf != nullptr && t->inf != inf) |
5108 | continue; | |
5109 | ||
53cccef1 TBA |
5110 | /* For a single-target setting with an all-stop target, |
5111 | we would not even arrive here. For a multi-target | |
5112 | setting, until GDB is able to handle a mixture of | |
5113 | all-stop and non-stop targets, simply skip all-stop | |
5114 | targets' threads. This should be fine due to the | |
5115 | protection of 'check_multi_target_resumption'. */ | |
5116 | ||
5117 | switch_to_thread_no_regs (t); | |
5118 | if (!target_is_non_stop_p ()) | |
5119 | continue; | |
5120 | ||
611841bb | 5121 | if (t->executing ()) |
372316f1 PA |
5122 | { |
5123 | /* If already stopping, don't request a stop again. | |
5124 | We just haven't seen the notification yet. */ | |
5125 | if (!t->stop_requested) | |
5126 | { | |
1eb8556f | 5127 | infrun_debug_printf (" %s executing, need stop", |
0fab7955 | 5128 | t->ptid.to_string ().c_str ()); |
372316f1 PA |
5129 | target_stop (t->ptid); |
5130 | t->stop_requested = 1; | |
5131 | } | |
5132 | else | |
5133 | { | |
1eb8556f | 5134 | infrun_debug_printf (" %s executing, already stopping", |
0fab7955 | 5135 | t->ptid.to_string ().c_str ()); |
372316f1 PA |
5136 | } |
5137 | ||
5138 | if (t->stop_requested) | |
29d6859f | 5139 | waits_needed++; |
372316f1 PA |
5140 | } |
5141 | else | |
5142 | { | |
1eb8556f | 5143 | infrun_debug_printf (" %s not executing", |
0fab7955 | 5144 | t->ptid.to_string ().c_str ()); |
372316f1 PA |
5145 | |
5146 | /* The thread may be not executing, but still be | |
5147 | resumed with a pending status to process. */ | |
7846f3aa | 5148 | t->set_resumed (false); |
372316f1 PA |
5149 | } |
5150 | } | |
5151 | ||
29d6859f | 5152 | if (waits_needed == 0) |
372316f1 PA |
5153 | break; |
5154 | ||
5155 | /* If we find new threads on the second iteration, restart | |
5156 | over. We want to see two iterations in a row with all | |
5157 | threads stopped. */ | |
5158 | if (pass > 0) | |
5159 | pass = -1; | |
5160 | ||
29d6859f | 5161 | for (int i = 0; i < waits_needed; i++) |
c29705b7 | 5162 | { |
29d6859f | 5163 | wait_one_event event = wait_one (); |
d758e62c PA |
5164 | if (handle_one (event)) |
5165 | break; | |
372316f1 PA |
5166 | } |
5167 | } | |
5168 | } | |
372316f1 PA |
5169 | } |
5170 | ||
f4836ba9 PA |
5171 | /* Handle a TARGET_WAITKIND_NO_RESUMED event. */ |
5172 | ||
c4464ade | 5173 | static bool |
f4836ba9 PA |
5174 | handle_no_resumed (struct execution_control_state *ecs) |
5175 | { | |
3b12939d | 5176 | if (target_can_async_p ()) |
f4836ba9 | 5177 | { |
c4464ade | 5178 | bool any_sync = false; |
f4836ba9 | 5179 | |
2dab0c7b | 5180 | for (ui *ui : all_uis ()) |
3b12939d PA |
5181 | { |
5182 | if (ui->prompt_state == PROMPT_BLOCKED) | |
5183 | { | |
c4464ade | 5184 | any_sync = true; |
3b12939d PA |
5185 | break; |
5186 | } | |
5187 | } | |
5188 | if (!any_sync) | |
5189 | { | |
5190 | /* There were no unwaited-for children left in the target, but, | |
5191 | we're not synchronously waiting for events either. Just | |
5192 | ignore. */ | |
5193 | ||
1eb8556f | 5194 | infrun_debug_printf ("TARGET_WAITKIND_NO_RESUMED (ignoring: bg)"); |
3b12939d | 5195 | prepare_to_wait (ecs); |
c4464ade | 5196 | return true; |
3b12939d | 5197 | } |
f4836ba9 PA |
5198 | } |
5199 | ||
5200 | /* Otherwise, if we were running a synchronous execution command, we | |
5201 | may need to cancel it and give the user back the terminal. | |
5202 | ||
5203 | In non-stop mode, the target can't tell whether we've already | |
5204 | consumed previous stop events, so it can end up sending us a | |
5205 | no-resumed event like so: | |
5206 | ||
5207 | #0 - thread 1 is left stopped | |
5208 | ||
5209 | #1 - thread 2 is resumed and hits breakpoint | |
dda83cd7 | 5210 | -> TARGET_WAITKIND_STOPPED |
f4836ba9 PA |
5211 | |
5212 | #2 - thread 3 is resumed and exits | |
dda83cd7 | 5213 | this is the last resumed thread, so |
f4836ba9 PA |
5214 | -> TARGET_WAITKIND_NO_RESUMED |
5215 | ||
5216 | #3 - gdb processes stop for thread 2 and decides to re-resume | |
dda83cd7 | 5217 | it. |
f4836ba9 PA |
5218 | |
5219 | #4 - gdb processes the TARGET_WAITKIND_NO_RESUMED event. | |
dda83cd7 | 5220 | thread 2 is now resumed, so the event should be ignored. |
f4836ba9 PA |
5221 | |
5222 | IOW, if the stop for thread 2 doesn't end a foreground command, | |
5223 | then we need to ignore the following TARGET_WAITKIND_NO_RESUMED | |
5224 | event. But it could be that the event meant that thread 2 itself | |
5225 | (or whatever other thread was the last resumed thread) exited. | |
5226 | ||
5227 | To address this we refresh the thread list and check whether we | |
5228 | have resumed threads _now_. In the example above, this removes | |
5229 | thread 3 from the thread list. If thread 2 was re-resumed, we | |
5230 | ignore this event. If we find no thread resumed, then we cancel | |
7d3badc6 PA |
5231 | the synchronous command and show "no unwaited-for " to the |
5232 | user. */ | |
f4836ba9 | 5233 | |
d6cc5d98 | 5234 | inferior *curr_inf = current_inferior (); |
7d3badc6 | 5235 | |
d6cc5d98 | 5236 | scoped_restore_current_thread restore_thread; |
1e864019 | 5237 | update_thread_list (); |
d6cc5d98 PA |
5238 | |
5239 | /* If: | |
5240 | ||
5241 | - the current target has no thread executing, and | |
5242 | - the current inferior is native, and | |
5243 | - the current inferior is the one which has the terminal, and | |
5244 | - we did nothing, | |
5245 | ||
5246 | then a Ctrl-C from this point on would remain stuck in the | |
5247 | kernel, until a thread resumes and dequeues it. That would | |
5248 | result in the GDB CLI not reacting to Ctrl-C, not able to | |
5249 | interrupt the program. To address this, if the current inferior | |
5250 | no longer has any thread executing, we give the terminal to some | |
5251 | other inferior that has at least one thread executing. */ | |
5252 | bool swap_terminal = true; | |
5253 | ||
5254 | /* Whether to ignore this TARGET_WAITKIND_NO_RESUMED event, or | |
5255 | whether to report it to the user. */ | |
5256 | bool ignore_event = false; | |
7d3badc6 PA |
5257 | |
5258 | for (thread_info *thread : all_non_exited_threads ()) | |
f4836ba9 | 5259 | { |
611841bb | 5260 | if (swap_terminal && thread->executing ()) |
d6cc5d98 PA |
5261 | { |
5262 | if (thread->inf != curr_inf) | |
5263 | { | |
5264 | target_terminal::ours (); | |
5265 | ||
5266 | switch_to_thread (thread); | |
5267 | target_terminal::inferior (); | |
5268 | } | |
5269 | swap_terminal = false; | |
5270 | } | |
5271 | ||
4d772ea2 | 5272 | if (!ignore_event && thread->resumed ()) |
f4836ba9 | 5273 | { |
7d3badc6 PA |
5274 | /* Either there were no unwaited-for children left in the |
5275 | target at some point, but there are now, or some target | |
5276 | other than the eventing one has unwaited-for children | |
5277 | left. Just ignore. */ | |
1eb8556f SM |
5278 | infrun_debug_printf ("TARGET_WAITKIND_NO_RESUMED " |
5279 | "(ignoring: found resumed)"); | |
d6cc5d98 PA |
5280 | |
5281 | ignore_event = true; | |
f4836ba9 | 5282 | } |
d6cc5d98 PA |
5283 | |
5284 | if (ignore_event && !swap_terminal) | |
5285 | break; | |
5286 | } | |
5287 | ||
5288 | if (ignore_event) | |
5289 | { | |
5290 | switch_to_inferior_no_thread (curr_inf); | |
5291 | prepare_to_wait (ecs); | |
c4464ade | 5292 | return true; |
f4836ba9 PA |
5293 | } |
5294 | ||
5295 | /* Go ahead and report the event. */ | |
c4464ade | 5296 | return false; |
f4836ba9 PA |
5297 | } |
5298 | ||
05ba8510 PA |
5299 | /* Given an execution control state that has been freshly filled in by |
5300 | an event from the inferior, figure out what it means and take | |
5301 | appropriate action. | |
5302 | ||
5303 | The alternatives are: | |
5304 | ||
22bcd14b | 5305 | 1) stop_waiting and return; to really stop and return to the |
05ba8510 PA |
5306 | debugger. |
5307 | ||
5308 | 2) keep_going and return; to wait for the next event (set | |
5309 | ecs->event_thread->stepping_over_breakpoint to 1 to single step | |
5310 | once). */ | |
c906108c | 5311 | |
ec9499be | 5312 | static void |
595915c1 | 5313 | handle_inferior_event (struct execution_control_state *ecs) |
cd0fc7c3 | 5314 | { |
595915c1 TT |
5315 | /* Make sure that all temporary struct value objects that were |
5316 | created during the handling of the event get deleted at the | |
5317 | end. */ | |
5318 | scoped_value_mark free_values; | |
5319 | ||
7dca2ea7 | 5320 | infrun_debug_printf ("%s", ecs->ws.to_string ().c_str ()); |
c29705b7 | 5321 | |
183be222 | 5322 | if (ecs->ws.kind () == TARGET_WAITKIND_IGNORE) |
28736962 PA |
5323 | { |
5324 | /* We had an event in the inferior, but we are not interested in | |
5325 | handling it at this level. The lower layers have already | |
5326 | done what needs to be done, if anything. | |
5327 | ||
5328 | One of the possible circumstances for this is when the | |
5329 | inferior produces output for the console. The inferior has | |
5330 | not stopped, and we are ignoring the event. Another possible | |
5331 | circumstance is any event which the lower level knows will be | |
5332 | reported multiple times without an intervening resume. */ | |
28736962 PA |
5333 | prepare_to_wait (ecs); |
5334 | return; | |
5335 | } | |
5336 | ||
183be222 | 5337 | if (ecs->ws.kind () == TARGET_WAITKIND_THREAD_EXITED) |
65706a29 | 5338 | { |
65706a29 PA |
5339 | prepare_to_wait (ecs); |
5340 | return; | |
5341 | } | |
5342 | ||
183be222 | 5343 | if (ecs->ws.kind () == TARGET_WAITKIND_NO_RESUMED |
f4836ba9 PA |
5344 | && handle_no_resumed (ecs)) |
5345 | return; | |
0e5bf2a8 | 5346 | |
5b6d1e4f PA |
5347 | /* Cache the last target/ptid/waitstatus. */ |
5348 | set_last_target_status (ecs->target, ecs->ptid, ecs->ws); | |
e02bc4cc | 5349 | |
ca005067 | 5350 | /* Always clear state belonging to the previous time we stopped. */ |
aa7d318d | 5351 | stop_stack_dummy = STOP_NONE; |
ca005067 | 5352 | |
183be222 | 5353 | if (ecs->ws.kind () == TARGET_WAITKIND_NO_RESUMED) |
0e5bf2a8 PA |
5354 | { |
5355 | /* No unwaited-for children left. IOW, all resumed children | |
5356 | have exited. */ | |
c4464ade | 5357 | stop_print_frame = false; |
22bcd14b | 5358 | stop_waiting (ecs); |
0e5bf2a8 PA |
5359 | return; |
5360 | } | |
5361 | ||
183be222 SM |
5362 | if (ecs->ws.kind () != TARGET_WAITKIND_EXITED |
5363 | && ecs->ws.kind () != TARGET_WAITKIND_SIGNALLED) | |
359f5fe6 | 5364 | { |
5b6d1e4f | 5365 | ecs->event_thread = find_thread_ptid (ecs->target, ecs->ptid); |
359f5fe6 | 5366 | /* If it's a new thread, add it to the thread database. */ |
03acd4d8 | 5367 | if (ecs->event_thread == nullptr) |
5b6d1e4f | 5368 | ecs->event_thread = add_thread (ecs->target, ecs->ptid); |
c1e36e3e PA |
5369 | |
5370 | /* Disable range stepping. If the next step request could use a | |
5371 | range, this will be end up re-enabled then. */ | |
5372 | ecs->event_thread->control.may_range_step = 0; | |
359f5fe6 | 5373 | } |
88ed393a JK |
5374 | |
5375 | /* Dependent on valid ECS->EVENT_THREAD. */ | |
c272a98c | 5376 | adjust_pc_after_break (ecs->event_thread, ecs->ws); |
88ed393a JK |
5377 | |
5378 | /* Dependent on the current PC value modified by adjust_pc_after_break. */ | |
5379 | reinit_frame_cache (); | |
5380 | ||
28736962 PA |
5381 | breakpoint_retire_moribund (); |
5382 | ||
2b009048 DJ |
5383 | /* First, distinguish signals caused by the debugger from signals |
5384 | that have to do with the program's own actions. Note that | |
5385 | breakpoint insns may cause SIGTRAP or SIGILL or SIGEMT, depending | |
5386 | on the operating system version. Here we detect when a SIGILL or | |
5387 | SIGEMT is really a breakpoint and change it to SIGTRAP. We do | |
5388 | something similar for SIGSEGV, since a SIGSEGV will be generated | |
5389 | when we're trying to execute a breakpoint instruction on a | |
5390 | non-executable stack. This happens for call dummy breakpoints | |
5391 | for architectures like SPARC that place call dummies on the | |
5392 | stack. */ | |
183be222 SM |
5393 | if (ecs->ws.kind () == TARGET_WAITKIND_STOPPED |
5394 | && (ecs->ws.sig () == GDB_SIGNAL_ILL | |
5395 | || ecs->ws.sig () == GDB_SIGNAL_SEGV | |
5396 | || ecs->ws.sig () == GDB_SIGNAL_EMT)) | |
2b009048 | 5397 | { |
00431a78 | 5398 | struct regcache *regcache = get_thread_regcache (ecs->event_thread); |
de0a0249 | 5399 | |
a01bda52 | 5400 | if (breakpoint_inserted_here_p (regcache->aspace (), |
de0a0249 UW |
5401 | regcache_read_pc (regcache))) |
5402 | { | |
1eb8556f | 5403 | infrun_debug_printf ("Treating signal as SIGTRAP"); |
183be222 | 5404 | ecs->ws.set_stopped (GDB_SIGNAL_TRAP); |
de0a0249 | 5405 | } |
2b009048 DJ |
5406 | } |
5407 | ||
293b3ebc | 5408 | mark_non_executing_threads (ecs->target, ecs->ptid, ecs->ws); |
8c90c137 | 5409 | |
183be222 | 5410 | switch (ecs->ws.kind ()) |
488f131b JB |
5411 | { |
5412 | case TARGET_WAITKIND_LOADED: | |
72d383bb SM |
5413 | { |
5414 | context_switch (ecs); | |
5415 | /* Ignore gracefully during startup of the inferior, as it might | |
5416 | be the shell which has just loaded some objects, otherwise | |
5417 | add the symbols for the newly loaded objects. Also ignore at | |
5418 | the beginning of an attach or remote session; we will query | |
5419 | the full list of libraries once the connection is | |
5420 | established. */ | |
5421 | ||
5422 | stop_kind stop_soon = get_inferior_stop_soon (ecs); | |
5423 | if (stop_soon == NO_STOP_QUIETLY) | |
5424 | { | |
5425 | struct regcache *regcache; | |
edcc5120 | 5426 | |
72d383bb | 5427 | regcache = get_thread_regcache (ecs->event_thread); |
edcc5120 | 5428 | |
72d383bb | 5429 | handle_solib_event (); |
ab04a2af | 5430 | |
9279eb5c | 5431 | ecs->event_thread->set_stop_pc (regcache_read_pc (regcache)); |
72d383bb | 5432 | ecs->event_thread->control.stop_bpstat |
d37e0847 PA |
5433 | = bpstat_stop_status_nowatch (regcache->aspace (), |
5434 | ecs->event_thread->stop_pc (), | |
5435 | ecs->event_thread, ecs->ws); | |
c65d6b55 | 5436 | |
72d383bb | 5437 | if (handle_stop_requested (ecs)) |
94c57d6a | 5438 | return; |
488f131b | 5439 | |
72d383bb SM |
5440 | if (bpstat_causes_stop (ecs->event_thread->control.stop_bpstat)) |
5441 | { | |
5442 | /* A catchpoint triggered. */ | |
5443 | process_event_stop_test (ecs); | |
5444 | return; | |
5445 | } | |
55409f9d | 5446 | |
72d383bb SM |
5447 | /* If requested, stop when the dynamic linker notifies |
5448 | gdb of events. This allows the user to get control | |
5449 | and place breakpoints in initializer routines for | |
5450 | dynamically loaded objects (among other things). */ | |
1edb66d8 | 5451 | ecs->event_thread->set_stop_signal (GDB_SIGNAL_0); |
72d383bb SM |
5452 | if (stop_on_solib_events) |
5453 | { | |
5454 | /* Make sure we print "Stopped due to solib-event" in | |
5455 | normal_stop. */ | |
5456 | stop_print_frame = true; | |
b0f4b84b | 5457 | |
72d383bb SM |
5458 | stop_waiting (ecs); |
5459 | return; | |
5460 | } | |
5461 | } | |
b0f4b84b | 5462 | |
72d383bb SM |
5463 | /* If we are skipping through a shell, or through shared library |
5464 | loading that we aren't interested in, resume the program. If | |
5465 | we're running the program normally, also resume. */ | |
5466 | if (stop_soon == STOP_QUIETLY || stop_soon == NO_STOP_QUIETLY) | |
5467 | { | |
5468 | /* Loading of shared libraries might have changed breakpoint | |
5469 | addresses. Make sure new breakpoints are inserted. */ | |
5470 | if (stop_soon == NO_STOP_QUIETLY) | |
5471 | insert_breakpoints (); | |
5472 | resume (GDB_SIGNAL_0); | |
5473 | prepare_to_wait (ecs); | |
5474 | return; | |
5475 | } | |
5c09a2c5 | 5476 | |
72d383bb SM |
5477 | /* But stop if we're attaching or setting up a remote |
5478 | connection. */ | |
5479 | if (stop_soon == STOP_QUIETLY_NO_SIGSTOP | |
5480 | || stop_soon == STOP_QUIETLY_REMOTE) | |
5481 | { | |
5482 | infrun_debug_printf ("quietly stopped"); | |
5483 | stop_waiting (ecs); | |
5484 | return; | |
5485 | } | |
5486 | ||
f34652de | 5487 | internal_error (_("unhandled stop_soon: %d"), (int) stop_soon); |
72d383bb | 5488 | } |
c5aa993b | 5489 | |
488f131b | 5490 | case TARGET_WAITKIND_SPURIOUS: |
c65d6b55 PA |
5491 | if (handle_stop_requested (ecs)) |
5492 | return; | |
00431a78 | 5493 | context_switch (ecs); |
64ce06e4 | 5494 | resume (GDB_SIGNAL_0); |
488f131b JB |
5495 | prepare_to_wait (ecs); |
5496 | return; | |
c5aa993b | 5497 | |
65706a29 | 5498 | case TARGET_WAITKIND_THREAD_CREATED: |
c65d6b55 PA |
5499 | if (handle_stop_requested (ecs)) |
5500 | return; | |
00431a78 | 5501 | context_switch (ecs); |
65706a29 PA |
5502 | if (!switch_back_to_stepped_thread (ecs)) |
5503 | keep_going (ecs); | |
5504 | return; | |
5505 | ||
488f131b | 5506 | case TARGET_WAITKIND_EXITED: |
940c3c06 | 5507 | case TARGET_WAITKIND_SIGNALLED: |
18493a00 PA |
5508 | { |
5509 | /* Depending on the system, ecs->ptid may point to a thread or | |
5510 | to a process. On some targets, target_mourn_inferior may | |
5511 | need to have access to the just-exited thread. That is the | |
5512 | case of GNU/Linux's "checkpoint" support, for example. | |
5513 | Call the switch_to_xxx routine as appropriate. */ | |
5514 | thread_info *thr = find_thread_ptid (ecs->target, ecs->ptid); | |
5515 | if (thr != nullptr) | |
5516 | switch_to_thread (thr); | |
5517 | else | |
5518 | { | |
5519 | inferior *inf = find_inferior_ptid (ecs->target, ecs->ptid); | |
5520 | switch_to_inferior_no_thread (inf); | |
5521 | } | |
5522 | } | |
6c95b8df | 5523 | handle_vfork_child_exec_or_exit (0); |
223ffa71 | 5524 | target_terminal::ours (); /* Must do this before mourn anyway. */ |
488f131b | 5525 | |
0c557179 SDJ |
5526 | /* Clearing any previous state of convenience variables. */ |
5527 | clear_exit_convenience_vars (); | |
5528 | ||
183be222 | 5529 | if (ecs->ws.kind () == TARGET_WAITKIND_EXITED) |
940c3c06 PA |
5530 | { |
5531 | /* Record the exit code in the convenience variable $_exitcode, so | |
5532 | that the user can inspect this again later. */ | |
5533 | set_internalvar_integer (lookup_internalvar ("_exitcode"), | |
183be222 | 5534 | (LONGEST) ecs->ws.exit_status ()); |
940c3c06 PA |
5535 | |
5536 | /* Also record this in the inferior itself. */ | |
30220b46 | 5537 | current_inferior ()->has_exit_code = true; |
183be222 | 5538 | current_inferior ()->exit_code = (LONGEST) ecs->ws.exit_status (); |
8cf64490 | 5539 | |
98eb56a4 | 5540 | /* Support the --return-child-result option. */ |
183be222 | 5541 | return_child_result_value = ecs->ws.exit_status (); |
98eb56a4 | 5542 | |
183be222 | 5543 | gdb::observers::exited.notify (ecs->ws.exit_status ()); |
940c3c06 PA |
5544 | } |
5545 | else | |
0c557179 | 5546 | { |
00431a78 | 5547 | struct gdbarch *gdbarch = current_inferior ()->gdbarch; |
0c557179 SDJ |
5548 | |
5549 | if (gdbarch_gdb_signal_to_target_p (gdbarch)) | |
5550 | { | |
5551 | /* Set the value of the internal variable $_exitsignal, | |
5552 | which holds the signal uncaught by the inferior. */ | |
5553 | set_internalvar_integer (lookup_internalvar ("_exitsignal"), | |
5554 | gdbarch_gdb_signal_to_target (gdbarch, | |
183be222 | 5555 | ecs->ws.sig ())); |
0c557179 SDJ |
5556 | } |
5557 | else | |
5558 | { | |
5559 | /* We don't have access to the target's method used for | |
5560 | converting between signal numbers (GDB's internal | |
5561 | representation <-> target's representation). | |
5562 | Therefore, we cannot do a good job at displaying this | |
5563 | information to the user. It's better to just warn | |
5564 | her about it (if infrun debugging is enabled), and | |
5565 | give up. */ | |
1eb8556f SM |
5566 | infrun_debug_printf ("Cannot fill $_exitsignal with the correct " |
5567 | "signal number."); | |
0c557179 SDJ |
5568 | } |
5569 | ||
183be222 | 5570 | gdb::observers::signal_exited.notify (ecs->ws.sig ()); |
0c557179 | 5571 | } |
8cf64490 | 5572 | |
488f131b | 5573 | gdb_flush (gdb_stdout); |
bc1e6c81 | 5574 | target_mourn_inferior (inferior_ptid); |
c4464ade | 5575 | stop_print_frame = false; |
22bcd14b | 5576 | stop_waiting (ecs); |
488f131b | 5577 | return; |
c5aa993b | 5578 | |
488f131b | 5579 | case TARGET_WAITKIND_FORKED: |
deb3b17b | 5580 | case TARGET_WAITKIND_VFORKED: |
e2d96639 YQ |
5581 | /* Check whether the inferior is displaced stepping. */ |
5582 | { | |
00431a78 | 5583 | struct regcache *regcache = get_thread_regcache (ecs->event_thread); |
ac7936df | 5584 | struct gdbarch *gdbarch = regcache->arch (); |
c0aba012 | 5585 | inferior *parent_inf = find_inferior_ptid (ecs->target, ecs->ptid); |
e2d96639 | 5586 | |
aeeb758d JB |
5587 | /* If this is a fork (child gets its own address space copy) |
5588 | and some displaced step buffers were in use at the time of | |
5589 | the fork, restore the displaced step buffer bytes in the | |
5590 | child process. | |
5591 | ||
5592 | Architectures which support displaced stepping and fork | |
5593 | events must supply an implementation of | |
5594 | gdbarch_displaced_step_restore_all_in_ptid. This is not | |
5595 | enforced during gdbarch validation to support architectures | |
5596 | which support displaced stepping but not forks. */ | |
183be222 | 5597 | if (ecs->ws.kind () == TARGET_WAITKIND_FORKED |
aeeb758d | 5598 | && gdbarch_supports_displaced_stepping (gdbarch)) |
187b041e | 5599 | gdbarch_displaced_step_restore_all_in_ptid |
183be222 | 5600 | (gdbarch, parent_inf, ecs->ws.child_ptid ()); |
c0aba012 SM |
5601 | |
5602 | /* If displaced stepping is supported, and thread ecs->ptid is | |
5603 | displaced stepping. */ | |
00431a78 | 5604 | if (displaced_step_in_progress_thread (ecs->event_thread)) |
e2d96639 | 5605 | { |
e2d96639 YQ |
5606 | struct regcache *child_regcache; |
5607 | CORE_ADDR parent_pc; | |
5608 | ||
5609 | /* GDB has got TARGET_WAITKIND_FORKED or TARGET_WAITKIND_VFORKED, | |
5610 | indicating that the displaced stepping of syscall instruction | |
5611 | has been done. Perform cleanup for parent process here. Note | |
5612 | that this operation also cleans up the child process for vfork, | |
5613 | because their pages are shared. */ | |
7def77a1 | 5614 | displaced_step_finish (ecs->event_thread, GDB_SIGNAL_TRAP); |
c2829269 PA |
5615 | /* Start a new step-over in another thread if there's one |
5616 | that needs it. */ | |
5617 | start_step_over (); | |
e2d96639 | 5618 | |
e2d96639 YQ |
5619 | /* Since the vfork/fork syscall instruction was executed in the scratchpad, |
5620 | the child's PC is also within the scratchpad. Set the child's PC | |
5621 | to the parent's PC value, which has already been fixed up. | |
5622 | FIXME: we use the parent's aspace here, although we're touching | |
5623 | the child, because the child hasn't been added to the inferior | |
5624 | list yet at this point. */ | |
5625 | ||
5626 | child_regcache | |
5b6d1e4f | 5627 | = get_thread_arch_aspace_regcache (parent_inf->process_target (), |
183be222 | 5628 | ecs->ws.child_ptid (), |
e2d96639 YQ |
5629 | gdbarch, |
5630 | parent_inf->aspace); | |
5631 | /* Read PC value of parent process. */ | |
5632 | parent_pc = regcache_read_pc (regcache); | |
5633 | ||
136821d9 SM |
5634 | displaced_debug_printf ("write child pc from %s to %s", |
5635 | paddress (gdbarch, | |
5636 | regcache_read_pc (child_regcache)), | |
5637 | paddress (gdbarch, parent_pc)); | |
e2d96639 YQ |
5638 | |
5639 | regcache_write_pc (child_regcache, parent_pc); | |
5640 | } | |
5641 | } | |
5642 | ||
00431a78 | 5643 | context_switch (ecs); |
5a2901d9 | 5644 | |
b242c3c2 PA |
5645 | /* Immediately detach breakpoints from the child before there's |
5646 | any chance of letting the user delete breakpoints from the | |
5647 | breakpoint lists. If we don't do this early, it's easy to | |
5648 | leave left over traps in the child, vis: "break foo; catch | |
5649 | fork; c; <fork>; del; c; <child calls foo>". We only follow | |
5650 | the fork on the last `continue', and by that time the | |
5651 | breakpoint at "foo" is long gone from the breakpoint table. | |
5652 | If we vforked, then we don't need to unpatch here, since both | |
5653 | parent and child are sharing the same memory pages; we'll | |
5654 | need to unpatch at follow/detach time instead to be certain | |
5655 | that new breakpoints added between catchpoint hit time and | |
5656 | vfork follow are detached. */ | |
183be222 | 5657 | if (ecs->ws.kind () != TARGET_WAITKIND_VFORKED) |
b242c3c2 | 5658 | { |
b242c3c2 PA |
5659 | /* This won't actually modify the breakpoint list, but will |
5660 | physically remove the breakpoints from the child. */ | |
183be222 | 5661 | detach_breakpoints (ecs->ws.child_ptid ()); |
b242c3c2 PA |
5662 | } |
5663 | ||
34b7e8a6 | 5664 | delete_just_stopped_threads_single_step_breakpoints (); |
d03285ec | 5665 | |
e58b0e63 PA |
5666 | /* In case the event is caught by a catchpoint, remember that |
5667 | the event is to be followed at the next resume of the thread, | |
5668 | and not immediately. */ | |
5669 | ecs->event_thread->pending_follow = ecs->ws; | |
5670 | ||
1edb66d8 SM |
5671 | ecs->event_thread->set_stop_pc |
5672 | (regcache_read_pc (get_thread_regcache (ecs->event_thread))); | |
675bf4cb | 5673 | |
16c381f0 | 5674 | ecs->event_thread->control.stop_bpstat |
d37e0847 PA |
5675 | = bpstat_stop_status_nowatch (get_current_regcache ()->aspace (), |
5676 | ecs->event_thread->stop_pc (), | |
5677 | ecs->event_thread, ecs->ws); | |
675bf4cb | 5678 | |
c65d6b55 PA |
5679 | if (handle_stop_requested (ecs)) |
5680 | return; | |
5681 | ||
ce12b012 PA |
5682 | /* If no catchpoint triggered for this, then keep going. Note |
5683 | that we're interested in knowing the bpstat actually causes a | |
5684 | stop, not just if it may explain the signal. Software | |
5685 | watchpoints, for example, always appear in the bpstat. */ | |
5686 | if (!bpstat_causes_stop (ecs->event_thread->control.stop_bpstat)) | |
04e68871 | 5687 | { |
5ab2fbf1 | 5688 | bool follow_child |
3e43a32a | 5689 | = (follow_fork_mode_string == follow_fork_mode_child); |
e58b0e63 | 5690 | |
1edb66d8 | 5691 | ecs->event_thread->set_stop_signal (GDB_SIGNAL_0); |
e58b0e63 | 5692 | |
5b6d1e4f PA |
5693 | process_stratum_target *targ |
5694 | = ecs->event_thread->inf->process_target (); | |
5695 | ||
5ab2fbf1 | 5696 | bool should_resume = follow_fork (); |
e58b0e63 | 5697 | |
5b6d1e4f PA |
5698 | /* Note that one of these may be an invalid pointer, |
5699 | depending on detach_fork. */ | |
00431a78 | 5700 | thread_info *parent = ecs->event_thread; |
183be222 | 5701 | thread_info *child = find_thread_ptid (targ, ecs->ws.child_ptid ()); |
6c95b8df | 5702 | |
a2077e25 PA |
5703 | /* At this point, the parent is marked running, and the |
5704 | child is marked stopped. */ | |
5705 | ||
5706 | /* If not resuming the parent, mark it stopped. */ | |
5707 | if (follow_child && !detach_fork && !non_stop && !sched_multi) | |
00431a78 | 5708 | parent->set_running (false); |
a2077e25 PA |
5709 | |
5710 | /* If resuming the child, mark it running. */ | |
5711 | if (follow_child || (!detach_fork && (non_stop || sched_multi))) | |
00431a78 | 5712 | child->set_running (true); |
a2077e25 | 5713 | |
6c95b8df | 5714 | /* In non-stop mode, also resume the other branch. */ |
fbea99ea PA |
5715 | if (!detach_fork && (non_stop |
5716 | || (sched_multi && target_is_non_stop_p ()))) | |
6c95b8df PA |
5717 | { |
5718 | if (follow_child) | |
5719 | switch_to_thread (parent); | |
5720 | else | |
5721 | switch_to_thread (child); | |
5722 | ||
5723 | ecs->event_thread = inferior_thread (); | |
5724 | ecs->ptid = inferior_ptid; | |
5725 | keep_going (ecs); | |
5726 | } | |
5727 | ||
5728 | if (follow_child) | |
5729 | switch_to_thread (child); | |
5730 | else | |
5731 | switch_to_thread (parent); | |
5732 | ||
e58b0e63 PA |
5733 | ecs->event_thread = inferior_thread (); |
5734 | ecs->ptid = inferior_ptid; | |
5735 | ||
5736 | if (should_resume) | |
27f9f649 SM |
5737 | { |
5738 | /* Never call switch_back_to_stepped_thread if we are waiting for | |
5739 | vfork-done (waiting for an external vfork child to exec or | |
5740 | exit). We will resume only the vforking thread for the purpose | |
5741 | of collecting the vfork-done event, and we will restart any | |
5742 | step once the critical shared address space window is done. */ | |
5743 | if ((!follow_child | |
5744 | && detach_fork | |
5745 | && parent->inf->thread_waiting_for_vfork_done != nullptr) | |
5746 | || !switch_back_to_stepped_thread (ecs)) | |
5747 | keep_going (ecs); | |
5748 | } | |
e58b0e63 | 5749 | else |
22bcd14b | 5750 | stop_waiting (ecs); |
04e68871 DJ |
5751 | return; |
5752 | } | |
94c57d6a PA |
5753 | process_event_stop_test (ecs); |
5754 | return; | |
488f131b | 5755 | |
6c95b8df PA |
5756 | case TARGET_WAITKIND_VFORK_DONE: |
5757 | /* Done with the shared memory region. Re-insert breakpoints in | |
5758 | the parent, and keep going. */ | |
5759 | ||
00431a78 | 5760 | context_switch (ecs); |
6c95b8df | 5761 | |
d8bbae6e SM |
5762 | handle_vfork_done (ecs->event_thread); |
5763 | gdb_assert (inferior_thread () == ecs->event_thread); | |
c65d6b55 PA |
5764 | |
5765 | if (handle_stop_requested (ecs)) | |
5766 | return; | |
5767 | ||
27f9f649 SM |
5768 | if (!switch_back_to_stepped_thread (ecs)) |
5769 | { | |
5770 | gdb_assert (inferior_thread () == ecs->event_thread); | |
5771 | /* This also takes care of reinserting breakpoints in the | |
5772 | previously locked inferior. */ | |
5773 | keep_going (ecs); | |
5774 | } | |
6c95b8df PA |
5775 | return; |
5776 | ||
488f131b | 5777 | case TARGET_WAITKIND_EXECD: |
488f131b | 5778 | |
cbd2b4e3 PA |
5779 | /* Note we can't read registers yet (the stop_pc), because we |
5780 | don't yet know the inferior's post-exec architecture. | |
5781 | 'stop_pc' is explicitly read below instead. */ | |
00431a78 | 5782 | switch_to_thread_no_regs (ecs->event_thread); |
5a2901d9 | 5783 | |
6c95b8df PA |
5784 | /* Do whatever is necessary to the parent branch of the vfork. */ |
5785 | handle_vfork_child_exec_or_exit (1); | |
5786 | ||
795e548f | 5787 | /* This causes the eventpoints and symbol table to be reset. |
dda83cd7 SM |
5788 | Must do this now, before trying to determine whether to |
5789 | stop. */ | |
183be222 | 5790 | follow_exec (inferior_ptid, ecs->ws.execd_pathname ()); |
795e548f | 5791 | |
17d8546e DB |
5792 | /* In follow_exec we may have deleted the original thread and |
5793 | created a new one. Make sure that the event thread is the | |
5794 | execd thread for that case (this is a nop otherwise). */ | |
5795 | ecs->event_thread = inferior_thread (); | |
5796 | ||
1edb66d8 SM |
5797 | ecs->event_thread->set_stop_pc |
5798 | (regcache_read_pc (get_thread_regcache (ecs->event_thread))); | |
ecdc3a72 | 5799 | |
16c381f0 | 5800 | ecs->event_thread->control.stop_bpstat |
d37e0847 PA |
5801 | = bpstat_stop_status_nowatch (get_current_regcache ()->aspace (), |
5802 | ecs->event_thread->stop_pc (), | |
5803 | ecs->event_thread, ecs->ws); | |
795e548f | 5804 | |
c65d6b55 PA |
5805 | if (handle_stop_requested (ecs)) |
5806 | return; | |
5807 | ||
04e68871 | 5808 | /* If no catchpoint triggered for this, then keep going. */ |
ce12b012 | 5809 | if (!bpstat_causes_stop (ecs->event_thread->control.stop_bpstat)) |
04e68871 | 5810 | { |
1edb66d8 | 5811 | ecs->event_thread->set_stop_signal (GDB_SIGNAL_0); |
04e68871 DJ |
5812 | keep_going (ecs); |
5813 | return; | |
5814 | } | |
94c57d6a PA |
5815 | process_event_stop_test (ecs); |
5816 | return; | |
488f131b | 5817 | |
b4dc5ffa | 5818 | /* Be careful not to try to gather much state about a thread |
dda83cd7 | 5819 | that's in a syscall. It's frequently a losing proposition. */ |
488f131b | 5820 | case TARGET_WAITKIND_SYSCALL_ENTRY: |
1777feb0 | 5821 | /* Getting the current syscall number. */ |
94c57d6a PA |
5822 | if (handle_syscall_event (ecs) == 0) |
5823 | process_event_stop_test (ecs); | |
5824 | return; | |
c906108c | 5825 | |
488f131b | 5826 | /* Before examining the threads further, step this thread to |
dda83cd7 SM |
5827 | get it entirely out of the syscall. (We get notice of the |
5828 | event when the thread is just on the verge of exiting a | |
5829 | syscall. Stepping one instruction seems to get it back | |
5830 | into user code.) */ | |
488f131b | 5831 | case TARGET_WAITKIND_SYSCALL_RETURN: |
94c57d6a PA |
5832 | if (handle_syscall_event (ecs) == 0) |
5833 | process_event_stop_test (ecs); | |
5834 | return; | |
c906108c | 5835 | |
488f131b | 5836 | case TARGET_WAITKIND_STOPPED: |
4f5d7f63 PA |
5837 | handle_signal_stop (ecs); |
5838 | return; | |
c906108c | 5839 | |
b2175913 MS |
5840 | case TARGET_WAITKIND_NO_HISTORY: |
5841 | /* Reverse execution: target ran out of history info. */ | |
eab402df | 5842 | |
d1988021 | 5843 | /* Switch to the stopped thread. */ |
00431a78 | 5844 | context_switch (ecs); |
1eb8556f | 5845 | infrun_debug_printf ("stopped"); |
d1988021 | 5846 | |
34b7e8a6 | 5847 | delete_just_stopped_threads_single_step_breakpoints (); |
1edb66d8 SM |
5848 | ecs->event_thread->set_stop_pc |
5849 | (regcache_read_pc (get_thread_regcache (inferior_thread ()))); | |
c65d6b55 PA |
5850 | |
5851 | if (handle_stop_requested (ecs)) | |
5852 | return; | |
5853 | ||
76727919 | 5854 | gdb::observers::no_history.notify (); |
22bcd14b | 5855 | stop_waiting (ecs); |
b2175913 | 5856 | return; |
488f131b | 5857 | } |
4f5d7f63 PA |
5858 | } |
5859 | ||
372316f1 | 5860 | /* Restart threads back to what they were trying to do back when we |
148cf134 SM |
5861 | paused them (because of an in-line step-over or vfork, for example). |
5862 | The EVENT_THREAD thread is ignored (not restarted). | |
5863 | ||
5864 | If INF is non-nullptr, only resume threads from INF. */ | |
4d9d9d04 PA |
5865 | |
5866 | static void | |
148cf134 | 5867 | restart_threads (struct thread_info *event_thread, inferior *inf) |
372316f1 | 5868 | { |
148cf134 SM |
5869 | INFRUN_SCOPED_DEBUG_START_END ("event_thread=%s, inf=%d", |
5870 | event_thread->ptid.to_string ().c_str (), | |
5871 | inf != nullptr ? inf->num : -1); | |
5872 | ||
2b718529 LS |
5873 | gdb_assert (!step_over_info_valid_p ()); |
5874 | ||
372316f1 PA |
5875 | /* In case the instruction just stepped spawned a new thread. */ |
5876 | update_thread_list (); | |
5877 | ||
08036331 | 5878 | for (thread_info *tp : all_non_exited_threads ()) |
372316f1 | 5879 | { |
148cf134 SM |
5880 | if (inf != nullptr && tp->inf != inf) |
5881 | continue; | |
5882 | ||
ac7d717c PA |
5883 | if (tp->inf->detaching) |
5884 | { | |
5885 | infrun_debug_printf ("restart threads: [%s] inferior detaching", | |
0fab7955 | 5886 | tp->ptid.to_string ().c_str ()); |
ac7d717c PA |
5887 | continue; |
5888 | } | |
5889 | ||
f3f8ece4 PA |
5890 | switch_to_thread_no_regs (tp); |
5891 | ||
372316f1 PA |
5892 | if (tp == event_thread) |
5893 | { | |
1eb8556f | 5894 | infrun_debug_printf ("restart threads: [%s] is event thread", |
0fab7955 | 5895 | tp->ptid.to_string ().c_str ()); |
372316f1 PA |
5896 | continue; |
5897 | } | |
5898 | ||
5899 | if (!(tp->state == THREAD_RUNNING || tp->control.in_infcall)) | |
5900 | { | |
1eb8556f | 5901 | infrun_debug_printf ("restart threads: [%s] not meant to be running", |
0fab7955 | 5902 | tp->ptid.to_string ().c_str ()); |
372316f1 PA |
5903 | continue; |
5904 | } | |
5905 | ||
7846f3aa | 5906 | if (tp->resumed ()) |
372316f1 | 5907 | { |
1eb8556f | 5908 | infrun_debug_printf ("restart threads: [%s] resumed", |
0fab7955 | 5909 | tp->ptid.to_string ().c_str ()); |
611841bb | 5910 | gdb_assert (tp->executing () || tp->has_pending_waitstatus ()); |
372316f1 PA |
5911 | continue; |
5912 | } | |
5913 | ||
5914 | if (thread_is_in_step_over_chain (tp)) | |
5915 | { | |
1eb8556f | 5916 | infrun_debug_printf ("restart threads: [%s] needs step-over", |
0fab7955 | 5917 | tp->ptid.to_string ().c_str ()); |
7846f3aa | 5918 | gdb_assert (!tp->resumed ()); |
372316f1 PA |
5919 | continue; |
5920 | } | |
5921 | ||
5922 | ||
1edb66d8 | 5923 | if (tp->has_pending_waitstatus ()) |
372316f1 | 5924 | { |
1eb8556f | 5925 | infrun_debug_printf ("restart threads: [%s] has pending status", |
0fab7955 | 5926 | tp->ptid.to_string ().c_str ()); |
7846f3aa | 5927 | tp->set_resumed (true); |
372316f1 PA |
5928 | continue; |
5929 | } | |
5930 | ||
c65d6b55 PA |
5931 | gdb_assert (!tp->stop_requested); |
5932 | ||
372316f1 PA |
5933 | /* If some thread needs to start a step-over at this point, it |
5934 | should still be in the step-over queue, and thus skipped | |
5935 | above. */ | |
5936 | if (thread_still_needs_step_over (tp)) | |
5937 | { | |
f34652de | 5938 | internal_error ("thread [%s] needs a step-over, but not in " |
372316f1 | 5939 | "step-over queue\n", |
0fab7955 | 5940 | tp->ptid.to_string ().c_str ()); |
372316f1 PA |
5941 | } |
5942 | ||
5943 | if (currently_stepping (tp)) | |
5944 | { | |
1eb8556f | 5945 | infrun_debug_printf ("restart threads: [%s] was stepping", |
0fab7955 | 5946 | tp->ptid.to_string ().c_str ()); |
372316f1 PA |
5947 | keep_going_stepped_thread (tp); |
5948 | } | |
5949 | else | |
5950 | { | |
1eb8556f | 5951 | infrun_debug_printf ("restart threads: [%s] continuing", |
0fab7955 | 5952 | tp->ptid.to_string ().c_str ()); |
aa563d16 | 5953 | execution_control_state ecs (tp); |
00431a78 | 5954 | switch_to_thread (tp); |
aa563d16 | 5955 | keep_going_pass_signal (&ecs); |
372316f1 PA |
5956 | } |
5957 | } | |
5958 | } | |
5959 | ||
5960 | /* Callback for iterate_over_threads. Find a resumed thread that has | |
5961 | a pending waitstatus. */ | |
5962 | ||
5963 | static int | |
5964 | resumed_thread_with_pending_status (struct thread_info *tp, | |
5965 | void *arg) | |
5966 | { | |
1edb66d8 | 5967 | return tp->resumed () && tp->has_pending_waitstatus (); |
372316f1 PA |
5968 | } |
5969 | ||
5970 | /* Called when we get an event that may finish an in-line or | |
5971 | out-of-line (displaced stepping) step-over started previously. | |
5972 | Return true if the event is processed and we should go back to the | |
5973 | event loop; false if the caller should continue processing the | |
5974 | event. */ | |
5975 | ||
5976 | static int | |
4d9d9d04 PA |
5977 | finish_step_over (struct execution_control_state *ecs) |
5978 | { | |
1edb66d8 | 5979 | displaced_step_finish (ecs->event_thread, ecs->event_thread->stop_signal ()); |
4d9d9d04 | 5980 | |
c4464ade | 5981 | bool had_step_over_info = step_over_info_valid_p (); |
372316f1 PA |
5982 | |
5983 | if (had_step_over_info) | |
4d9d9d04 PA |
5984 | { |
5985 | /* If we're stepping over a breakpoint with all threads locked, | |
5986 | then only the thread that was stepped should be reporting | |
5987 | back an event. */ | |
5988 | gdb_assert (ecs->event_thread->control.trap_expected); | |
5989 | ||
c65d6b55 | 5990 | clear_step_over_info (); |
4d9d9d04 PA |
5991 | } |
5992 | ||
fbea99ea | 5993 | if (!target_is_non_stop_p ()) |
372316f1 | 5994 | return 0; |
4d9d9d04 PA |
5995 | |
5996 | /* Start a new step-over in another thread if there's one that | |
5997 | needs it. */ | |
5998 | start_step_over (); | |
372316f1 PA |
5999 | |
6000 | /* If we were stepping over a breakpoint before, and haven't started | |
6001 | a new in-line step-over sequence, then restart all other threads | |
6002 | (except the event thread). We can't do this in all-stop, as then | |
6003 | e.g., we wouldn't be able to issue any other remote packet until | |
6004 | these other threads stop. */ | |
6005 | if (had_step_over_info && !step_over_info_valid_p ()) | |
6006 | { | |
6007 | struct thread_info *pending; | |
6008 | ||
6009 | /* If we only have threads with pending statuses, the restart | |
6010 | below won't restart any thread and so nothing re-inserts the | |
6011 | breakpoint we just stepped over. But we need it inserted | |
6012 | when we later process the pending events, otherwise if | |
6013 | another thread has a pending event for this breakpoint too, | |
6014 | we'd discard its event (because the breakpoint that | |
6015 | originally caused the event was no longer inserted). */ | |
00431a78 | 6016 | context_switch (ecs); |
372316f1 PA |
6017 | insert_breakpoints (); |
6018 | ||
6019 | restart_threads (ecs->event_thread); | |
6020 | ||
6021 | /* If we have events pending, go through handle_inferior_event | |
6022 | again, picking up a pending event at random. This avoids | |
6023 | thread starvation. */ | |
6024 | ||
6025 | /* But not if we just stepped over a watchpoint in order to let | |
6026 | the instruction execute so we can evaluate its expression. | |
6027 | The set of watchpoints that triggered is recorded in the | |
6028 | breakpoint objects themselves (see bp->watchpoint_triggered). | |
6029 | If we processed another event first, that other event could | |
6030 | clobber this info. */ | |
6031 | if (ecs->event_thread->stepping_over_watchpoint) | |
6032 | return 0; | |
6033 | ||
6034 | pending = iterate_over_threads (resumed_thread_with_pending_status, | |
03acd4d8 CL |
6035 | nullptr); |
6036 | if (pending != nullptr) | |
372316f1 PA |
6037 | { |
6038 | struct thread_info *tp = ecs->event_thread; | |
6039 | struct regcache *regcache; | |
6040 | ||
1eb8556f SM |
6041 | infrun_debug_printf ("found resumed threads with " |
6042 | "pending events, saving status"); | |
372316f1 PA |
6043 | |
6044 | gdb_assert (pending != tp); | |
6045 | ||
6046 | /* Record the event thread's event for later. */ | |
c272a98c | 6047 | save_waitstatus (tp, ecs->ws); |
372316f1 PA |
6048 | /* This was cleared early, by handle_inferior_event. Set it |
6049 | so this pending event is considered by | |
6050 | do_target_wait. */ | |
7846f3aa | 6051 | tp->set_resumed (true); |
372316f1 | 6052 | |
611841bb | 6053 | gdb_assert (!tp->executing ()); |
372316f1 | 6054 | |
00431a78 | 6055 | regcache = get_thread_regcache (tp); |
1edb66d8 | 6056 | tp->set_stop_pc (regcache_read_pc (regcache)); |
372316f1 | 6057 | |
1eb8556f SM |
6058 | infrun_debug_printf ("saved stop_pc=%s for %s " |
6059 | "(currently_stepping=%d)", | |
1edb66d8 | 6060 | paddress (target_gdbarch (), tp->stop_pc ()), |
0fab7955 | 6061 | tp->ptid.to_string ().c_str (), |
1eb8556f | 6062 | currently_stepping (tp)); |
372316f1 PA |
6063 | |
6064 | /* This in-line step-over finished; clear this so we won't | |
6065 | start a new one. This is what handle_signal_stop would | |
6066 | do, if we returned false. */ | |
6067 | tp->stepping_over_breakpoint = 0; | |
6068 | ||
6069 | /* Wake up the event loop again. */ | |
6070 | mark_async_event_handler (infrun_async_inferior_event_token); | |
6071 | ||
6072 | prepare_to_wait (ecs); | |
6073 | return 1; | |
6074 | } | |
6075 | } | |
6076 | ||
6077 | return 0; | |
4d9d9d04 PA |
6078 | } |
6079 | ||
4f5d7f63 PA |
6080 | /* Come here when the program has stopped with a signal. */ |
6081 | ||
6082 | static void | |
6083 | handle_signal_stop (struct execution_control_state *ecs) | |
6084 | { | |
bd2b40ac | 6085 | frame_info_ptr frame; |
4f5d7f63 PA |
6086 | struct gdbarch *gdbarch; |
6087 | int stopped_by_watchpoint; | |
6088 | enum stop_kind stop_soon; | |
6089 | int random_signal; | |
c906108c | 6090 | |
183be222 | 6091 | gdb_assert (ecs->ws.kind () == TARGET_WAITKIND_STOPPED); |
f0407826 | 6092 | |
183be222 | 6093 | ecs->event_thread->set_stop_signal (ecs->ws.sig ()); |
c65d6b55 | 6094 | |
f0407826 DE |
6095 | /* Do we need to clean up the state of a thread that has |
6096 | completed a displaced single-step? (Doing so usually affects | |
6097 | the PC, so do it here, before we set stop_pc.) */ | |
372316f1 PA |
6098 | if (finish_step_over (ecs)) |
6099 | return; | |
f0407826 DE |
6100 | |
6101 | /* If we either finished a single-step or hit a breakpoint, but | |
6102 | the user wanted this thread to be stopped, pretend we got a | |
6103 | SIG0 (generic unsignaled stop). */ | |
6104 | if (ecs->event_thread->stop_requested | |
1edb66d8 SM |
6105 | && ecs->event_thread->stop_signal () == GDB_SIGNAL_TRAP) |
6106 | ecs->event_thread->set_stop_signal (GDB_SIGNAL_0); | |
237fc4c9 | 6107 | |
1edb66d8 SM |
6108 | ecs->event_thread->set_stop_pc |
6109 | (regcache_read_pc (get_thread_regcache (ecs->event_thread))); | |
488f131b | 6110 | |
2ab76a18 PA |
6111 | context_switch (ecs); |
6112 | ||
6113 | if (deprecated_context_hook) | |
6114 | deprecated_context_hook (ecs->event_thread->global_num); | |
6115 | ||
527159b7 | 6116 | if (debug_infrun) |
237fc4c9 | 6117 | { |
00431a78 | 6118 | struct regcache *regcache = get_thread_regcache (ecs->event_thread); |
b926417a | 6119 | struct gdbarch *reg_gdbarch = regcache->arch (); |
7f82dfc7 | 6120 | |
1edb66d8 SM |
6121 | infrun_debug_printf |
6122 | ("stop_pc=%s", paddress (reg_gdbarch, ecs->event_thread->stop_pc ())); | |
d92524f1 | 6123 | if (target_stopped_by_watchpoint ()) |
237fc4c9 | 6124 | { |
dda83cd7 | 6125 | CORE_ADDR addr; |
abbb1732 | 6126 | |
1eb8556f | 6127 | infrun_debug_printf ("stopped by watchpoint"); |
237fc4c9 | 6128 | |
328d42d8 SM |
6129 | if (target_stopped_data_address (current_inferior ()->top_target (), |
6130 | &addr)) | |
1eb8556f | 6131 | infrun_debug_printf ("stopped data address=%s", |
dda83cd7 SM |
6132 | paddress (reg_gdbarch, addr)); |
6133 | else | |
1eb8556f | 6134 | infrun_debug_printf ("(no data address available)"); |
237fc4c9 PA |
6135 | } |
6136 | } | |
527159b7 | 6137 | |
36fa8042 PA |
6138 | /* This is originated from start_remote(), start_inferior() and |
6139 | shared libraries hook functions. */ | |
00431a78 | 6140 | stop_soon = get_inferior_stop_soon (ecs); |
36fa8042 PA |
6141 | if (stop_soon == STOP_QUIETLY || stop_soon == STOP_QUIETLY_REMOTE) |
6142 | { | |
1eb8556f | 6143 | infrun_debug_printf ("quietly stopped"); |
c4464ade | 6144 | stop_print_frame = true; |
22bcd14b | 6145 | stop_waiting (ecs); |
36fa8042 PA |
6146 | return; |
6147 | } | |
6148 | ||
36fa8042 PA |
6149 | /* This originates from attach_command(). We need to overwrite |
6150 | the stop_signal here, because some kernels don't ignore a | |
6151 | SIGSTOP in a subsequent ptrace(PTRACE_CONT,SIGSTOP) call. | |
6152 | See more comments in inferior.h. On the other hand, if we | |
6153 | get a non-SIGSTOP, report it to the user - assume the backend | |
6154 | will handle the SIGSTOP if it should show up later. | |
6155 | ||
6156 | Also consider that the attach is complete when we see a | |
6157 | SIGTRAP. Some systems (e.g. Windows), and stubs supporting | |
6158 | target extended-remote report it instead of a SIGSTOP | |
6159 | (e.g. gdbserver). We already rely on SIGTRAP being our | |
6160 | signal, so this is no exception. | |
6161 | ||
6162 | Also consider that the attach is complete when we see a | |
6163 | GDB_SIGNAL_0. In non-stop mode, GDB will explicitly tell | |
6164 | the target to stop all threads of the inferior, in case the | |
6165 | low level attach operation doesn't stop them implicitly. If | |
6166 | they weren't stopped implicitly, then the stub will report a | |
6167 | GDB_SIGNAL_0, meaning: stopped for no particular reason | |
6168 | other than GDB's request. */ | |
6169 | if (stop_soon == STOP_QUIETLY_NO_SIGSTOP | |
1edb66d8 SM |
6170 | && (ecs->event_thread->stop_signal () == GDB_SIGNAL_STOP |
6171 | || ecs->event_thread->stop_signal () == GDB_SIGNAL_TRAP | |
6172 | || ecs->event_thread->stop_signal () == GDB_SIGNAL_0)) | |
36fa8042 | 6173 | { |
c4464ade | 6174 | stop_print_frame = true; |
22bcd14b | 6175 | stop_waiting (ecs); |
1edb66d8 | 6176 | ecs->event_thread->set_stop_signal (GDB_SIGNAL_0); |
36fa8042 PA |
6177 | return; |
6178 | } | |
6179 | ||
568d6575 UW |
6180 | /* At this point, get hold of the now-current thread's frame. */ |
6181 | frame = get_current_frame (); | |
6182 | gdbarch = get_frame_arch (frame); | |
6183 | ||
2adfaa28 | 6184 | /* Pull the single step breakpoints out of the target. */ |
1edb66d8 | 6185 | if (ecs->event_thread->stop_signal () == GDB_SIGNAL_TRAP) |
488f131b | 6186 | { |
af48d08f | 6187 | struct regcache *regcache; |
af48d08f | 6188 | CORE_ADDR pc; |
2adfaa28 | 6189 | |
00431a78 | 6190 | regcache = get_thread_regcache (ecs->event_thread); |
8b86c959 YQ |
6191 | const address_space *aspace = regcache->aspace (); |
6192 | ||
af48d08f | 6193 | pc = regcache_read_pc (regcache); |
34b7e8a6 | 6194 | |
af48d08f PA |
6195 | /* However, before doing so, if this single-step breakpoint was |
6196 | actually for another thread, set this thread up for moving | |
6197 | past it. */ | |
6198 | if (!thread_has_single_step_breakpoint_here (ecs->event_thread, | |
6199 | aspace, pc)) | |
6200 | { | |
6201 | if (single_step_breakpoint_inserted_here_p (aspace, pc)) | |
2adfaa28 | 6202 | { |
1eb8556f SM |
6203 | infrun_debug_printf ("[%s] hit another thread's single-step " |
6204 | "breakpoint", | |
0fab7955 | 6205 | ecs->ptid.to_string ().c_str ()); |
af48d08f PA |
6206 | ecs->hit_singlestep_breakpoint = 1; |
6207 | } | |
6208 | } | |
6209 | else | |
6210 | { | |
1eb8556f | 6211 | infrun_debug_printf ("[%s] hit its single-step breakpoint", |
0fab7955 | 6212 | ecs->ptid.to_string ().c_str ()); |
2adfaa28 | 6213 | } |
488f131b | 6214 | } |
af48d08f | 6215 | delete_just_stopped_threads_single_step_breakpoints (); |
c906108c | 6216 | |
1edb66d8 | 6217 | if (ecs->event_thread->stop_signal () == GDB_SIGNAL_TRAP |
963f9c80 PA |
6218 | && ecs->event_thread->control.trap_expected |
6219 | && ecs->event_thread->stepping_over_watchpoint) | |
d983da9c DJ |
6220 | stopped_by_watchpoint = 0; |
6221 | else | |
c272a98c | 6222 | stopped_by_watchpoint = watchpoints_triggered (ecs->ws); |
d983da9c DJ |
6223 | |
6224 | /* If necessary, step over this watchpoint. We'll be back to display | |
6225 | it in a moment. */ | |
6226 | if (stopped_by_watchpoint | |
9aed480c | 6227 | && (target_have_steppable_watchpoint () |
568d6575 | 6228 | || gdbarch_have_nonsteppable_watchpoint (gdbarch))) |
488f131b | 6229 | { |
488f131b | 6230 | /* At this point, we are stopped at an instruction which has |
dda83cd7 SM |
6231 | attempted to write to a piece of memory under control of |
6232 | a watchpoint. The instruction hasn't actually executed | |
6233 | yet. If we were to evaluate the watchpoint expression | |
6234 | now, we would get the old value, and therefore no change | |
6235 | would seem to have occurred. | |
6236 | ||
6237 | In order to make watchpoints work `right', we really need | |
6238 | to complete the memory write, and then evaluate the | |
6239 | watchpoint expression. We do this by single-stepping the | |
d983da9c DJ |
6240 | target. |
6241 | ||
7f89fd65 | 6242 | It may not be necessary to disable the watchpoint to step over |
d983da9c DJ |
6243 | it. For example, the PA can (with some kernel cooperation) |
6244 | single step over a watchpoint without disabling the watchpoint. | |
6245 | ||
6246 | It is far more common to need to disable a watchpoint to step | |
6247 | the inferior over it. If we have non-steppable watchpoints, | |
6248 | we must disable the current watchpoint; it's simplest to | |
963f9c80 PA |
6249 | disable all watchpoints. |
6250 | ||
6251 | Any breakpoint at PC must also be stepped over -- if there's | |
6252 | one, it will have already triggered before the watchpoint | |
6253 | triggered, and we either already reported it to the user, or | |
6254 | it didn't cause a stop and we called keep_going. In either | |
6255 | case, if there was a breakpoint at PC, we must be trying to | |
6256 | step past it. */ | |
6257 | ecs->event_thread->stepping_over_watchpoint = 1; | |
6258 | keep_going (ecs); | |
488f131b JB |
6259 | return; |
6260 | } | |
6261 | ||
4e1c45ea | 6262 | ecs->event_thread->stepping_over_breakpoint = 0; |
963f9c80 | 6263 | ecs->event_thread->stepping_over_watchpoint = 0; |
16c381f0 JK |
6264 | bpstat_clear (&ecs->event_thread->control.stop_bpstat); |
6265 | ecs->event_thread->control.stop_step = 0; | |
c4464ade | 6266 | stop_print_frame = true; |
488f131b | 6267 | stopped_by_random_signal = 0; |
313f3b21 | 6268 | bpstat *stop_chain = nullptr; |
488f131b | 6269 | |
edb3359d DJ |
6270 | /* Hide inlined functions starting here, unless we just performed stepi or |
6271 | nexti. After stepi and nexti, always show the innermost frame (not any | |
6272 | inline function call sites). */ | |
16c381f0 | 6273 | if (ecs->event_thread->control.step_range_end != 1) |
0574c78f | 6274 | { |
00431a78 PA |
6275 | const address_space *aspace |
6276 | = get_thread_regcache (ecs->event_thread)->aspace (); | |
0574c78f GB |
6277 | |
6278 | /* skip_inline_frames is expensive, so we avoid it if we can | |
6279 | determine that the address is one where functions cannot have | |
6280 | been inlined. This improves performance with inferiors that | |
6281 | load a lot of shared libraries, because the solib event | |
6282 | breakpoint is defined as the address of a function (i.e. not | |
6283 | inline). Note that we have to check the previous PC as well | |
6284 | as the current one to catch cases when we have just | |
6285 | single-stepped off a breakpoint prior to reinstating it. | |
6286 | Note that we're assuming that the code we single-step to is | |
6287 | not inline, but that's not definitive: there's nothing | |
6288 | preventing the event breakpoint function from containing | |
6289 | inlined code, and the single-step ending up there. If the | |
6290 | user had set a breakpoint on that inlined code, the missing | |
6291 | skip_inline_frames call would break things. Fortunately | |
6292 | that's an extremely unlikely scenario. */ | |
f2ffa92b | 6293 | if (!pc_at_non_inline_function (aspace, |
1edb66d8 | 6294 | ecs->event_thread->stop_pc (), |
c272a98c | 6295 | ecs->ws) |
1edb66d8 | 6296 | && !(ecs->event_thread->stop_signal () == GDB_SIGNAL_TRAP |
a210c238 MR |
6297 | && ecs->event_thread->control.trap_expected |
6298 | && pc_at_non_inline_function (aspace, | |
6299 | ecs->event_thread->prev_pc, | |
c272a98c | 6300 | ecs->ws))) |
1c5a993e | 6301 | { |
f2ffa92b | 6302 | stop_chain = build_bpstat_chain (aspace, |
1edb66d8 | 6303 | ecs->event_thread->stop_pc (), |
c272a98c | 6304 | ecs->ws); |
00431a78 | 6305 | skip_inline_frames (ecs->event_thread, stop_chain); |
1c5a993e MR |
6306 | |
6307 | /* Re-fetch current thread's frame in case that invalidated | |
6308 | the frame cache. */ | |
6309 | frame = get_current_frame (); | |
6310 | gdbarch = get_frame_arch (frame); | |
6311 | } | |
0574c78f | 6312 | } |
edb3359d | 6313 | |
1edb66d8 | 6314 | if (ecs->event_thread->stop_signal () == GDB_SIGNAL_TRAP |
16c381f0 | 6315 | && ecs->event_thread->control.trap_expected |
568d6575 | 6316 | && gdbarch_single_step_through_delay_p (gdbarch) |
4e1c45ea | 6317 | && currently_stepping (ecs->event_thread)) |
3352ef37 | 6318 | { |
b50d7442 | 6319 | /* We're trying to step off a breakpoint. Turns out that we're |
3352ef37 | 6320 | also on an instruction that needs to be stepped multiple |
1777feb0 | 6321 | times before it's been fully executing. E.g., architectures |
3352ef37 AC |
6322 | with a delay slot. It needs to be stepped twice, once for |
6323 | the instruction and once for the delay slot. */ | |
6324 | int step_through_delay | |
568d6575 | 6325 | = gdbarch_single_step_through_delay (gdbarch, frame); |
abbb1732 | 6326 | |
1eb8556f SM |
6327 | if (step_through_delay) |
6328 | infrun_debug_printf ("step through delay"); | |
6329 | ||
16c381f0 JK |
6330 | if (ecs->event_thread->control.step_range_end == 0 |
6331 | && step_through_delay) | |
3352ef37 AC |
6332 | { |
6333 | /* The user issued a continue when stopped at a breakpoint. | |
6334 | Set up for another trap and get out of here. */ | |
dda83cd7 SM |
6335 | ecs->event_thread->stepping_over_breakpoint = 1; |
6336 | keep_going (ecs); | |
6337 | return; | |
3352ef37 AC |
6338 | } |
6339 | else if (step_through_delay) | |
6340 | { | |
6341 | /* The user issued a step when stopped at a breakpoint. | |
6342 | Maybe we should stop, maybe we should not - the delay | |
6343 | slot *might* correspond to a line of source. In any | |
ca67fcb8 VP |
6344 | case, don't decide that here, just set |
6345 | ecs->stepping_over_breakpoint, making sure we | |
6346 | single-step again before breakpoints are re-inserted. */ | |
4e1c45ea | 6347 | ecs->event_thread->stepping_over_breakpoint = 1; |
3352ef37 AC |
6348 | } |
6349 | } | |
6350 | ||
ab04a2af TT |
6351 | /* See if there is a breakpoint/watchpoint/catchpoint/etc. that |
6352 | handles this event. */ | |
6353 | ecs->event_thread->control.stop_bpstat | |
a01bda52 | 6354 | = bpstat_stop_status (get_current_regcache ()->aspace (), |
1edb66d8 | 6355 | ecs->event_thread->stop_pc (), |
c272a98c | 6356 | ecs->event_thread, ecs->ws, stop_chain); |
db82e815 | 6357 | |
ab04a2af TT |
6358 | /* Following in case break condition called a |
6359 | function. */ | |
c4464ade | 6360 | stop_print_frame = true; |
73dd234f | 6361 | |
ab04a2af TT |
6362 | /* This is where we handle "moribund" watchpoints. Unlike |
6363 | software breakpoints traps, hardware watchpoint traps are | |
6364 | always distinguishable from random traps. If no high-level | |
6365 | watchpoint is associated with the reported stop data address | |
6366 | anymore, then the bpstat does not explain the signal --- | |
6367 | simply make sure to ignore it if `stopped_by_watchpoint' is | |
6368 | set. */ | |
6369 | ||
1edb66d8 | 6370 | if (ecs->event_thread->stop_signal () == GDB_SIGNAL_TRAP |
47591c29 | 6371 | && !bpstat_explains_signal (ecs->event_thread->control.stop_bpstat, |
427cd150 | 6372 | GDB_SIGNAL_TRAP) |
ab04a2af | 6373 | && stopped_by_watchpoint) |
1eb8556f SM |
6374 | { |
6375 | infrun_debug_printf ("no user watchpoint explains watchpoint SIGTRAP, " | |
6376 | "ignoring"); | |
6377 | } | |
73dd234f | 6378 | |
bac7d97b | 6379 | /* NOTE: cagney/2003-03-29: These checks for a random signal |
ab04a2af TT |
6380 | at one stage in the past included checks for an inferior |
6381 | function call's call dummy's return breakpoint. The original | |
6382 | comment, that went with the test, read: | |
03cebad2 | 6383 | |
ab04a2af TT |
6384 | ``End of a stack dummy. Some systems (e.g. Sony news) give |
6385 | another signal besides SIGTRAP, so check here as well as | |
6386 | above.'' | |
73dd234f | 6387 | |
ab04a2af TT |
6388 | If someone ever tries to get call dummys on a |
6389 | non-executable stack to work (where the target would stop | |
6390 | with something like a SIGSEGV), then those tests might need | |
6391 | to be re-instated. Given, however, that the tests were only | |
6392 | enabled when momentary breakpoints were not being used, I | |
6393 | suspect that it won't be the case. | |
488f131b | 6394 | |
ab04a2af TT |
6395 | NOTE: kettenis/2004-02-05: Indeed such checks don't seem to |
6396 | be necessary for call dummies on a non-executable stack on | |
6397 | SPARC. */ | |
488f131b | 6398 | |
bac7d97b | 6399 | /* See if the breakpoints module can explain the signal. */ |
47591c29 PA |
6400 | random_signal |
6401 | = !bpstat_explains_signal (ecs->event_thread->control.stop_bpstat, | |
1edb66d8 | 6402 | ecs->event_thread->stop_signal ()); |
bac7d97b | 6403 | |
1cf4d951 PA |
6404 | /* Maybe this was a trap for a software breakpoint that has since |
6405 | been removed. */ | |
6406 | if (random_signal && target_stopped_by_sw_breakpoint ()) | |
6407 | { | |
5133a315 | 6408 | if (gdbarch_program_breakpoint_here_p (gdbarch, |
1edb66d8 | 6409 | ecs->event_thread->stop_pc ())) |
1cf4d951 PA |
6410 | { |
6411 | struct regcache *regcache; | |
6412 | int decr_pc; | |
6413 | ||
6414 | /* Re-adjust PC to what the program would see if GDB was not | |
6415 | debugging it. */ | |
00431a78 | 6416 | regcache = get_thread_regcache (ecs->event_thread); |
527a273a | 6417 | decr_pc = gdbarch_decr_pc_after_break (gdbarch); |
1cf4d951 PA |
6418 | if (decr_pc != 0) |
6419 | { | |
07036511 TT |
6420 | gdb::optional<scoped_restore_tmpl<int>> |
6421 | restore_operation_disable; | |
1cf4d951 PA |
6422 | |
6423 | if (record_full_is_used ()) | |
07036511 TT |
6424 | restore_operation_disable.emplace |
6425 | (record_full_gdb_operation_disable_set ()); | |
1cf4d951 | 6426 | |
f2ffa92b | 6427 | regcache_write_pc (regcache, |
1edb66d8 | 6428 | ecs->event_thread->stop_pc () + decr_pc); |
1cf4d951 PA |
6429 | } |
6430 | } | |
6431 | else | |
6432 | { | |
6433 | /* A delayed software breakpoint event. Ignore the trap. */ | |
1eb8556f | 6434 | infrun_debug_printf ("delayed software breakpoint trap, ignoring"); |
1cf4d951 PA |
6435 | random_signal = 0; |
6436 | } | |
6437 | } | |
6438 | ||
6439 | /* Maybe this was a trap for a hardware breakpoint/watchpoint that | |
6440 | has since been removed. */ | |
6441 | if (random_signal && target_stopped_by_hw_breakpoint ()) | |
6442 | { | |
6443 | /* A delayed hardware breakpoint event. Ignore the trap. */ | |
1eb8556f SM |
6444 | infrun_debug_printf ("delayed hardware breakpoint/watchpoint " |
6445 | "trap, ignoring"); | |
1cf4d951 PA |
6446 | random_signal = 0; |
6447 | } | |
6448 | ||
bac7d97b PA |
6449 | /* If not, perhaps stepping/nexting can. */ |
6450 | if (random_signal) | |
1edb66d8 | 6451 | random_signal = !(ecs->event_thread->stop_signal () == GDB_SIGNAL_TRAP |
bac7d97b | 6452 | && currently_stepping (ecs->event_thread)); |
ab04a2af | 6453 | |
2adfaa28 PA |
6454 | /* Perhaps the thread hit a single-step breakpoint of _another_ |
6455 | thread. Single-step breakpoints are transparent to the | |
6456 | breakpoints module. */ | |
6457 | if (random_signal) | |
6458 | random_signal = !ecs->hit_singlestep_breakpoint; | |
6459 | ||
bac7d97b PA |
6460 | /* No? Perhaps we got a moribund watchpoint. */ |
6461 | if (random_signal) | |
6462 | random_signal = !stopped_by_watchpoint; | |
ab04a2af | 6463 | |
c65d6b55 PA |
6464 | /* Always stop if the user explicitly requested this thread to |
6465 | remain stopped. */ | |
6466 | if (ecs->event_thread->stop_requested) | |
6467 | { | |
6468 | random_signal = 1; | |
1eb8556f | 6469 | infrun_debug_printf ("user-requested stop"); |
c65d6b55 PA |
6470 | } |
6471 | ||
488f131b JB |
6472 | /* For the program's own signals, act according to |
6473 | the signal handling tables. */ | |
6474 | ||
ce12b012 | 6475 | if (random_signal) |
488f131b JB |
6476 | { |
6477 | /* Signal not for debugging purposes. */ | |
1edb66d8 | 6478 | enum gdb_signal stop_signal = ecs->event_thread->stop_signal (); |
488f131b | 6479 | |
1eb8556f SM |
6480 | infrun_debug_printf ("random signal (%s)", |
6481 | gdb_signal_to_symbol_string (stop_signal)); | |
527159b7 | 6482 | |
488f131b JB |
6483 | stopped_by_random_signal = 1; |
6484 | ||
252fbfc8 PA |
6485 | /* Always stop on signals if we're either just gaining control |
6486 | of the program, or the user explicitly requested this thread | |
6487 | to remain stopped. */ | |
d6b48e9c | 6488 | if (stop_soon != NO_STOP_QUIETLY |
252fbfc8 | 6489 | || ecs->event_thread->stop_requested |
1edb66d8 | 6490 | || signal_stop_state (ecs->event_thread->stop_signal ())) |
488f131b | 6491 | { |
22bcd14b | 6492 | stop_waiting (ecs); |
488f131b JB |
6493 | return; |
6494 | } | |
b57bacec PA |
6495 | |
6496 | /* Notify observers the signal has "handle print" set. Note we | |
6497 | returned early above if stopping; normal_stop handles the | |
6498 | printing in that case. */ | |
1edb66d8 | 6499 | if (signal_print[ecs->event_thread->stop_signal ()]) |
b57bacec PA |
6500 | { |
6501 | /* The signal table tells us to print about this signal. */ | |
223ffa71 | 6502 | target_terminal::ours_for_output (); |
1edb66d8 | 6503 | gdb::observers::signal_received.notify (ecs->event_thread->stop_signal ()); |
223ffa71 | 6504 | target_terminal::inferior (); |
b57bacec | 6505 | } |
488f131b JB |
6506 | |
6507 | /* Clear the signal if it should not be passed. */ | |
1edb66d8 SM |
6508 | if (signal_program[ecs->event_thread->stop_signal ()] == 0) |
6509 | ecs->event_thread->set_stop_signal (GDB_SIGNAL_0); | |
488f131b | 6510 | |
1edb66d8 | 6511 | if (ecs->event_thread->prev_pc == ecs->event_thread->stop_pc () |
16c381f0 | 6512 | && ecs->event_thread->control.trap_expected |
03acd4d8 | 6513 | && ecs->event_thread->control.step_resume_breakpoint == nullptr) |
68f53502 AC |
6514 | { |
6515 | /* We were just starting a new sequence, attempting to | |
6516 | single-step off of a breakpoint and expecting a SIGTRAP. | |
237fc4c9 | 6517 | Instead this signal arrives. This signal will take us out |
68f53502 AC |
6518 | of the stepping range so GDB needs to remember to, when |
6519 | the signal handler returns, resume stepping off that | |
6520 | breakpoint. */ | |
6521 | /* To simplify things, "continue" is forced to use the same | |
6522 | code paths as single-step - set a breakpoint at the | |
6523 | signal return address and then, once hit, step off that | |
6524 | breakpoint. */ | |
1eb8556f | 6525 | infrun_debug_printf ("signal arrived while stepping over breakpoint"); |
d3169d93 | 6526 | |
2c03e5be | 6527 | insert_hp_step_resume_breakpoint_at_frame (frame); |
4e1c45ea | 6528 | ecs->event_thread->step_after_step_resume_breakpoint = 1; |
2455069d UW |
6529 | /* Reset trap_expected to ensure breakpoints are re-inserted. */ |
6530 | ecs->event_thread->control.trap_expected = 0; | |
d137e6dc PA |
6531 | |
6532 | /* If we were nexting/stepping some other thread, switch to | |
6533 | it, so that we don't continue it, losing control. */ | |
6534 | if (!switch_back_to_stepped_thread (ecs)) | |
6535 | keep_going (ecs); | |
9d799f85 | 6536 | return; |
68f53502 | 6537 | } |
9d799f85 | 6538 | |
1edb66d8 SM |
6539 | if (ecs->event_thread->stop_signal () != GDB_SIGNAL_0 |
6540 | && (pc_in_thread_step_range (ecs->event_thread->stop_pc (), | |
f2ffa92b | 6541 | ecs->event_thread) |
e5f8a7cc | 6542 | || ecs->event_thread->control.step_range_end == 1) |
a0cbd650 TT |
6543 | && (get_stack_frame_id (frame) |
6544 | == ecs->event_thread->control.step_stack_frame_id) | |
03acd4d8 | 6545 | && ecs->event_thread->control.step_resume_breakpoint == nullptr) |
d303a6c7 AC |
6546 | { |
6547 | /* The inferior is about to take a signal that will take it | |
6548 | out of the single step range. Set a breakpoint at the | |
6549 | current PC (which is presumably where the signal handler | |
6550 | will eventually return) and then allow the inferior to | |
6551 | run free. | |
6552 | ||
6553 | Note that this is only needed for a signal delivered | |
6554 | while in the single-step range. Nested signals aren't a | |
6555 | problem as they eventually all return. */ | |
1eb8556f | 6556 | infrun_debug_printf ("signal may take us out of single-step range"); |
237fc4c9 | 6557 | |
372316f1 | 6558 | clear_step_over_info (); |
2c03e5be | 6559 | insert_hp_step_resume_breakpoint_at_frame (frame); |
e5f8a7cc | 6560 | ecs->event_thread->step_after_step_resume_breakpoint = 1; |
2455069d UW |
6561 | /* Reset trap_expected to ensure breakpoints are re-inserted. */ |
6562 | ecs->event_thread->control.trap_expected = 0; | |
9d799f85 AC |
6563 | keep_going (ecs); |
6564 | return; | |
d303a6c7 | 6565 | } |
9d799f85 | 6566 | |
85102364 | 6567 | /* Note: step_resume_breakpoint may be non-NULL. This occurs |
9d799f85 AC |
6568 | when either there's a nested signal, or when there's a |
6569 | pending signal enabled just as the signal handler returns | |
6570 | (leaving the inferior at the step-resume-breakpoint without | |
6571 | actually executing it). Either way continue until the | |
6572 | breakpoint is really hit. */ | |
c447ac0b PA |
6573 | |
6574 | if (!switch_back_to_stepped_thread (ecs)) | |
6575 | { | |
1eb8556f | 6576 | infrun_debug_printf ("random signal, keep going"); |
c447ac0b PA |
6577 | |
6578 | keep_going (ecs); | |
6579 | } | |
6580 | return; | |
488f131b | 6581 | } |
94c57d6a PA |
6582 | |
6583 | process_event_stop_test (ecs); | |
6584 | } | |
6585 | ||
6586 | /* Come here when we've got some debug event / signal we can explain | |
6587 | (IOW, not a random signal), and test whether it should cause a | |
6588 | stop, or whether we should resume the inferior (transparently). | |
6589 | E.g., could be a breakpoint whose condition evaluates false; we | |
6590 | could be still stepping within the line; etc. */ | |
6591 | ||
6592 | static void | |
6593 | process_event_stop_test (struct execution_control_state *ecs) | |
6594 | { | |
6595 | struct symtab_and_line stop_pc_sal; | |
bd2b40ac | 6596 | frame_info_ptr frame; |
94c57d6a | 6597 | struct gdbarch *gdbarch; |
cdaa5b73 PA |
6598 | CORE_ADDR jmp_buf_pc; |
6599 | struct bpstat_what what; | |
94c57d6a | 6600 | |
cdaa5b73 | 6601 | /* Handle cases caused by hitting a breakpoint. */ |
611c83ae | 6602 | |
cdaa5b73 PA |
6603 | frame = get_current_frame (); |
6604 | gdbarch = get_frame_arch (frame); | |
fcf3daef | 6605 | |
cdaa5b73 | 6606 | what = bpstat_what (ecs->event_thread->control.stop_bpstat); |
611c83ae | 6607 | |
cdaa5b73 PA |
6608 | if (what.call_dummy) |
6609 | { | |
6610 | stop_stack_dummy = what.call_dummy; | |
6611 | } | |
186c406b | 6612 | |
243a9253 PA |
6613 | /* A few breakpoint types have callbacks associated (e.g., |
6614 | bp_jit_event). Run them now. */ | |
6615 | bpstat_run_callbacks (ecs->event_thread->control.stop_bpstat); | |
6616 | ||
cdaa5b73 PA |
6617 | /* If we hit an internal event that triggers symbol changes, the |
6618 | current frame will be invalidated within bpstat_what (e.g., if we | |
6619 | hit an internal solib event). Re-fetch it. */ | |
6620 | frame = get_current_frame (); | |
6621 | gdbarch = get_frame_arch (frame); | |
e2e4d78b | 6622 | |
cdaa5b73 PA |
6623 | switch (what.main_action) |
6624 | { | |
6625 | case BPSTAT_WHAT_SET_LONGJMP_RESUME: | |
6626 | /* If we hit the breakpoint at longjmp while stepping, we | |
6627 | install a momentary breakpoint at the target of the | |
6628 | jmp_buf. */ | |
186c406b | 6629 | |
1eb8556f | 6630 | infrun_debug_printf ("BPSTAT_WHAT_SET_LONGJMP_RESUME"); |
186c406b | 6631 | |
cdaa5b73 | 6632 | ecs->event_thread->stepping_over_breakpoint = 1; |
611c83ae | 6633 | |
cdaa5b73 PA |
6634 | if (what.is_longjmp) |
6635 | { | |
6636 | struct value *arg_value; | |
6637 | ||
6638 | /* If we set the longjmp breakpoint via a SystemTap probe, | |
6639 | then use it to extract the arguments. The destination PC | |
6640 | is the third argument to the probe. */ | |
6641 | arg_value = probe_safe_evaluate_at_pc (frame, 2); | |
6642 | if (arg_value) | |
8fa0c4f8 AA |
6643 | { |
6644 | jmp_buf_pc = value_as_address (arg_value); | |
6645 | jmp_buf_pc = gdbarch_addr_bits_remove (gdbarch, jmp_buf_pc); | |
6646 | } | |
cdaa5b73 PA |
6647 | else if (!gdbarch_get_longjmp_target_p (gdbarch) |
6648 | || !gdbarch_get_longjmp_target (gdbarch, | |
6649 | frame, &jmp_buf_pc)) | |
e2e4d78b | 6650 | { |
1eb8556f SM |
6651 | infrun_debug_printf ("BPSTAT_WHAT_SET_LONGJMP_RESUME " |
6652 | "(!gdbarch_get_longjmp_target)"); | |
cdaa5b73 PA |
6653 | keep_going (ecs); |
6654 | return; | |
e2e4d78b | 6655 | } |
e2e4d78b | 6656 | |
cdaa5b73 PA |
6657 | /* Insert a breakpoint at resume address. */ |
6658 | insert_longjmp_resume_breakpoint (gdbarch, jmp_buf_pc); | |
6659 | } | |
6660 | else | |
6661 | check_exception_resume (ecs, frame); | |
6662 | keep_going (ecs); | |
6663 | return; | |
e81a37f7 | 6664 | |
cdaa5b73 PA |
6665 | case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME: |
6666 | { | |
bd2b40ac | 6667 | frame_info_ptr init_frame; |
e81a37f7 | 6668 | |
cdaa5b73 | 6669 | /* There are several cases to consider. |
c906108c | 6670 | |
cdaa5b73 PA |
6671 | 1. The initiating frame no longer exists. In this case we |
6672 | must stop, because the exception or longjmp has gone too | |
6673 | far. | |
2c03e5be | 6674 | |
cdaa5b73 PA |
6675 | 2. The initiating frame exists, and is the same as the |
6676 | current frame. We stop, because the exception or longjmp | |
6677 | has been caught. | |
2c03e5be | 6678 | |
cdaa5b73 PA |
6679 | 3. The initiating frame exists and is different from the |
6680 | current frame. This means the exception or longjmp has | |
6681 | been caught beneath the initiating frame, so keep going. | |
c906108c | 6682 | |
cdaa5b73 PA |
6683 | 4. longjmp breakpoint has been placed just to protect |
6684 | against stale dummy frames and user is not interested in | |
6685 | stopping around longjmps. */ | |
c5aa993b | 6686 | |
1eb8556f | 6687 | infrun_debug_printf ("BPSTAT_WHAT_CLEAR_LONGJMP_RESUME"); |
c5aa993b | 6688 | |
cdaa5b73 | 6689 | gdb_assert (ecs->event_thread->control.exception_resume_breakpoint |
03acd4d8 | 6690 | != nullptr); |
cdaa5b73 | 6691 | delete_exception_resume_breakpoint (ecs->event_thread); |
c5aa993b | 6692 | |
cdaa5b73 PA |
6693 | if (what.is_longjmp) |
6694 | { | |
b67a2c6f | 6695 | check_longjmp_breakpoint_for_call_dummy (ecs->event_thread); |
c5aa993b | 6696 | |
cdaa5b73 | 6697 | if (!frame_id_p (ecs->event_thread->initiating_frame)) |
e5ef252a | 6698 | { |
cdaa5b73 PA |
6699 | /* Case 4. */ |
6700 | keep_going (ecs); | |
6701 | return; | |
e5ef252a | 6702 | } |
cdaa5b73 | 6703 | } |
c5aa993b | 6704 | |
cdaa5b73 | 6705 | init_frame = frame_find_by_id (ecs->event_thread->initiating_frame); |
527159b7 | 6706 | |
cdaa5b73 PA |
6707 | if (init_frame) |
6708 | { | |
6709 | struct frame_id current_id | |
6710 | = get_frame_id (get_current_frame ()); | |
a0cbd650 | 6711 | if (current_id == ecs->event_thread->initiating_frame) |
cdaa5b73 PA |
6712 | { |
6713 | /* Case 2. Fall through. */ | |
6714 | } | |
6715 | else | |
6716 | { | |
6717 | /* Case 3. */ | |
6718 | keep_going (ecs); | |
6719 | return; | |
6720 | } | |
68f53502 | 6721 | } |
488f131b | 6722 | |
cdaa5b73 PA |
6723 | /* For Cases 1 and 2, remove the step-resume breakpoint, if it |
6724 | exists. */ | |
6725 | delete_step_resume_breakpoint (ecs->event_thread); | |
e5ef252a | 6726 | |
bdc36728 | 6727 | end_stepping_range (ecs); |
cdaa5b73 PA |
6728 | } |
6729 | return; | |
e5ef252a | 6730 | |
cdaa5b73 | 6731 | case BPSTAT_WHAT_SINGLE: |
1eb8556f | 6732 | infrun_debug_printf ("BPSTAT_WHAT_SINGLE"); |
cdaa5b73 PA |
6733 | ecs->event_thread->stepping_over_breakpoint = 1; |
6734 | /* Still need to check other stuff, at least the case where we | |
6735 | are stepping and step out of the right range. */ | |
6736 | break; | |
e5ef252a | 6737 | |
cdaa5b73 | 6738 | case BPSTAT_WHAT_STEP_RESUME: |
1eb8556f | 6739 | infrun_debug_printf ("BPSTAT_WHAT_STEP_RESUME"); |
b22548dd | 6740 | |
b986eec5 CL |
6741 | delete_step_resume_breakpoint (ecs->event_thread); |
6742 | if (ecs->event_thread->control.proceed_to_finish | |
6743 | && execution_direction == EXEC_REVERSE) | |
cdaa5b73 PA |
6744 | { |
6745 | struct thread_info *tp = ecs->event_thread; | |
b22548dd | 6746 | |
b986eec5 CL |
6747 | /* We are finishing a function in reverse, and just hit the |
6748 | step-resume breakpoint at the start address of the | |
6749 | function, and we're almost there -- just need to back up | |
6750 | by one more single-step, which should take us back to the | |
6751 | function call. */ | |
6752 | tp->control.step_range_start = tp->control.step_range_end = 1; | |
6753 | keep_going (ecs); | |
6754 | return; | |
6755 | } | |
6756 | fill_in_stop_func (gdbarch, ecs); | |
6757 | if (ecs->event_thread->stop_pc () == ecs->stop_func_start | |
6758 | && execution_direction == EXEC_REVERSE) | |
6759 | { | |
6760 | /* We are stepping over a function call in reverse, and just | |
6761 | hit the step-resume breakpoint at the start address of | |
6762 | the function. Go back to single-stepping, which should | |
6763 | take us back to the function call. */ | |
6764 | ecs->event_thread->stepping_over_breakpoint = 1; | |
cdaa5b73 PA |
6765 | keep_going (ecs); |
6766 | return; | |
6767 | } | |
6768 | break; | |
e5ef252a | 6769 | |
cdaa5b73 | 6770 | case BPSTAT_WHAT_STOP_NOISY: |
1eb8556f | 6771 | infrun_debug_printf ("BPSTAT_WHAT_STOP_NOISY"); |
c4464ade | 6772 | stop_print_frame = true; |
e5ef252a | 6773 | |
33bf4c5c | 6774 | /* Assume the thread stopped for a breakpoint. We'll still check |
99619bea PA |
6775 | whether a/the breakpoint is there when the thread is next |
6776 | resumed. */ | |
6777 | ecs->event_thread->stepping_over_breakpoint = 1; | |
e5ef252a | 6778 | |
22bcd14b | 6779 | stop_waiting (ecs); |
cdaa5b73 | 6780 | return; |
e5ef252a | 6781 | |
cdaa5b73 | 6782 | case BPSTAT_WHAT_STOP_SILENT: |
1eb8556f | 6783 | infrun_debug_printf ("BPSTAT_WHAT_STOP_SILENT"); |
c4464ade | 6784 | stop_print_frame = false; |
e5ef252a | 6785 | |
33bf4c5c | 6786 | /* Assume the thread stopped for a breakpoint. We'll still check |
99619bea PA |
6787 | whether a/the breakpoint is there when the thread is next |
6788 | resumed. */ | |
6789 | ecs->event_thread->stepping_over_breakpoint = 1; | |
22bcd14b | 6790 | stop_waiting (ecs); |
cdaa5b73 PA |
6791 | return; |
6792 | ||
6793 | case BPSTAT_WHAT_HP_STEP_RESUME: | |
1eb8556f | 6794 | infrun_debug_printf ("BPSTAT_WHAT_HP_STEP_RESUME"); |
cdaa5b73 PA |
6795 | |
6796 | delete_step_resume_breakpoint (ecs->event_thread); | |
6797 | if (ecs->event_thread->step_after_step_resume_breakpoint) | |
6798 | { | |
6799 | /* Back when the step-resume breakpoint was inserted, we | |
6800 | were trying to single-step off a breakpoint. Go back to | |
6801 | doing that. */ | |
6802 | ecs->event_thread->step_after_step_resume_breakpoint = 0; | |
6803 | ecs->event_thread->stepping_over_breakpoint = 1; | |
6804 | keep_going (ecs); | |
6805 | return; | |
e5ef252a | 6806 | } |
cdaa5b73 PA |
6807 | break; |
6808 | ||
6809 | case BPSTAT_WHAT_KEEP_CHECKING: | |
6810 | break; | |
e5ef252a | 6811 | } |
c906108c | 6812 | |
af48d08f PA |
6813 | /* If we stepped a permanent breakpoint and we had a high priority |
6814 | step-resume breakpoint for the address we stepped, but we didn't | |
6815 | hit it, then we must have stepped into the signal handler. The | |
6816 | step-resume was only necessary to catch the case of _not_ | |
6817 | stepping into the handler, so delete it, and fall through to | |
6818 | checking whether the step finished. */ | |
6819 | if (ecs->event_thread->stepped_breakpoint) | |
6820 | { | |
6821 | struct breakpoint *sr_bp | |
6822 | = ecs->event_thread->control.step_resume_breakpoint; | |
6823 | ||
03acd4d8 | 6824 | if (sr_bp != nullptr |
8d707a12 | 6825 | && sr_bp->loc->permanent |
af48d08f PA |
6826 | && sr_bp->type == bp_hp_step_resume |
6827 | && sr_bp->loc->address == ecs->event_thread->prev_pc) | |
6828 | { | |
1eb8556f | 6829 | infrun_debug_printf ("stepped permanent breakpoint, stopped in handler"); |
af48d08f PA |
6830 | delete_step_resume_breakpoint (ecs->event_thread); |
6831 | ecs->event_thread->step_after_step_resume_breakpoint = 0; | |
6832 | } | |
6833 | } | |
6834 | ||
cdaa5b73 PA |
6835 | /* We come here if we hit a breakpoint but should not stop for it. |
6836 | Possibly we also were stepping and should stop for that. So fall | |
6837 | through and test for stepping. But, if not stepping, do not | |
6838 | stop. */ | |
c906108c | 6839 | |
a7212384 UW |
6840 | /* In all-stop mode, if we're currently stepping but have stopped in |
6841 | some other thread, we need to switch back to the stepped thread. */ | |
c447ac0b PA |
6842 | if (switch_back_to_stepped_thread (ecs)) |
6843 | return; | |
776f04fa | 6844 | |
8358c15c | 6845 | if (ecs->event_thread->control.step_resume_breakpoint) |
488f131b | 6846 | { |
1eb8556f | 6847 | infrun_debug_printf ("step-resume breakpoint is inserted"); |
527159b7 | 6848 | |
488f131b | 6849 | /* Having a step-resume breakpoint overrides anything |
dda83cd7 SM |
6850 | else having to do with stepping commands until |
6851 | that breakpoint is reached. */ | |
488f131b JB |
6852 | keep_going (ecs); |
6853 | return; | |
6854 | } | |
c5aa993b | 6855 | |
16c381f0 | 6856 | if (ecs->event_thread->control.step_range_end == 0) |
488f131b | 6857 | { |
1eb8556f | 6858 | infrun_debug_printf ("no stepping, continue"); |
488f131b | 6859 | /* Likewise if we aren't even stepping. */ |
488f131b JB |
6860 | keep_going (ecs); |
6861 | return; | |
6862 | } | |
c5aa993b | 6863 | |
4b7703ad JB |
6864 | /* Re-fetch current thread's frame in case the code above caused |
6865 | the frame cache to be re-initialized, making our FRAME variable | |
6866 | a dangling pointer. */ | |
6867 | frame = get_current_frame (); | |
628fe4e4 | 6868 | gdbarch = get_frame_arch (frame); |
7e324e48 | 6869 | fill_in_stop_func (gdbarch, ecs); |
4b7703ad | 6870 | |
488f131b | 6871 | /* If stepping through a line, keep going if still within it. |
c906108c | 6872 | |
488f131b JB |
6873 | Note that step_range_end is the address of the first instruction |
6874 | beyond the step range, and NOT the address of the last instruction | |
31410e84 MS |
6875 | within it! |
6876 | ||
6877 | Note also that during reverse execution, we may be stepping | |
6878 | through a function epilogue and therefore must detect when | |
6879 | the current-frame changes in the middle of a line. */ | |
6880 | ||
1edb66d8 | 6881 | if (pc_in_thread_step_range (ecs->event_thread->stop_pc (), |
f2ffa92b | 6882 | ecs->event_thread) |
31410e84 | 6883 | && (execution_direction != EXEC_REVERSE |
a0cbd650 | 6884 | || get_frame_id (frame) == ecs->event_thread->control.step_frame_id)) |
488f131b | 6885 | { |
1eb8556f SM |
6886 | infrun_debug_printf |
6887 | ("stepping inside range [%s-%s]", | |
6888 | paddress (gdbarch, ecs->event_thread->control.step_range_start), | |
6889 | paddress (gdbarch, ecs->event_thread->control.step_range_end)); | |
b2175913 | 6890 | |
c1e36e3e PA |
6891 | /* Tentatively re-enable range stepping; `resume' disables it if |
6892 | necessary (e.g., if we're stepping over a breakpoint or we | |
6893 | have software watchpoints). */ | |
6894 | ecs->event_thread->control.may_range_step = 1; | |
6895 | ||
b2175913 MS |
6896 | /* When stepping backward, stop at beginning of line range |
6897 | (unless it's the function entry point, in which case | |
6898 | keep going back to the call point). */ | |
1edb66d8 | 6899 | CORE_ADDR stop_pc = ecs->event_thread->stop_pc (); |
16c381f0 | 6900 | if (stop_pc == ecs->event_thread->control.step_range_start |
15d2b36c | 6901 | && stop_pc != ecs->stop_func_start |
b2175913 | 6902 | && execution_direction == EXEC_REVERSE) |
bdc36728 | 6903 | end_stepping_range (ecs); |
b2175913 MS |
6904 | else |
6905 | keep_going (ecs); | |
6906 | ||
488f131b JB |
6907 | return; |
6908 | } | |
c5aa993b | 6909 | |
488f131b | 6910 | /* We stepped out of the stepping range. */ |
c906108c | 6911 | |
488f131b | 6912 | /* If we are stepping at the source level and entered the runtime |
388a8562 MS |
6913 | loader dynamic symbol resolution code... |
6914 | ||
6915 | EXEC_FORWARD: we keep on single stepping until we exit the run | |
6916 | time loader code and reach the callee's address. | |
6917 | ||
6918 | EXEC_REVERSE: we've already executed the callee (backward), and | |
6919 | the runtime loader code is handled just like any other | |
6920 | undebuggable function call. Now we need only keep stepping | |
6921 | backward through the trampoline code, and that's handled further | |
6922 | down, so there is nothing for us to do here. */ | |
6923 | ||
6924 | if (execution_direction != EXEC_REVERSE | |
16c381f0 | 6925 | && ecs->event_thread->control.step_over_calls == STEP_OVER_UNDEBUGGABLE |
be6276e0 | 6926 | && in_solib_dynsym_resolve_code (ecs->event_thread->stop_pc ()) |
bafcc335 LS |
6927 | && (ecs->event_thread->control.step_start_function == nullptr |
6928 | || !in_solib_dynsym_resolve_code ( | |
6929 | ecs->event_thread->control.step_start_function->value_block () | |
6930 | ->entry_pc ()))) | |
488f131b | 6931 | { |
4c8c40e6 | 6932 | CORE_ADDR pc_after_resolver = |
1edb66d8 | 6933 | gdbarch_skip_solib_resolver (gdbarch, ecs->event_thread->stop_pc ()); |
c906108c | 6934 | |
1eb8556f | 6935 | infrun_debug_printf ("stepped into dynsym resolve code"); |
527159b7 | 6936 | |
488f131b JB |
6937 | if (pc_after_resolver) |
6938 | { | |
6939 | /* Set up a step-resume breakpoint at the address | |
6940 | indicated by SKIP_SOLIB_RESOLVER. */ | |
51abb421 | 6941 | symtab_and_line sr_sal; |
488f131b | 6942 | sr_sal.pc = pc_after_resolver; |
6c95b8df | 6943 | sr_sal.pspace = get_frame_program_space (frame); |
488f131b | 6944 | |
a6d9a66e UW |
6945 | insert_step_resume_breakpoint_at_sal (gdbarch, |
6946 | sr_sal, null_frame_id); | |
c5aa993b | 6947 | } |
c906108c | 6948 | |
488f131b JB |
6949 | keep_going (ecs); |
6950 | return; | |
6951 | } | |
c906108c | 6952 | |
1d509aa6 MM |
6953 | /* Step through an indirect branch thunk. */ |
6954 | if (ecs->event_thread->control.step_over_calls != STEP_OVER_NONE | |
f2ffa92b | 6955 | && gdbarch_in_indirect_branch_thunk (gdbarch, |
1edb66d8 | 6956 | ecs->event_thread->stop_pc ())) |
1d509aa6 | 6957 | { |
1eb8556f | 6958 | infrun_debug_printf ("stepped into indirect branch thunk"); |
1d509aa6 MM |
6959 | keep_going (ecs); |
6960 | return; | |
6961 | } | |
6962 | ||
16c381f0 JK |
6963 | if (ecs->event_thread->control.step_range_end != 1 |
6964 | && (ecs->event_thread->control.step_over_calls == STEP_OVER_UNDEBUGGABLE | |
6965 | || ecs->event_thread->control.step_over_calls == STEP_OVER_ALL) | |
568d6575 | 6966 | && get_frame_type (frame) == SIGTRAMP_FRAME) |
488f131b | 6967 | { |
1eb8556f | 6968 | infrun_debug_printf ("stepped into signal trampoline"); |
42edda50 | 6969 | /* The inferior, while doing a "step" or "next", has ended up in |
dda83cd7 SM |
6970 | a signal trampoline (either by a signal being delivered or by |
6971 | the signal handler returning). Just single-step until the | |
6972 | inferior leaves the trampoline (either by calling the handler | |
6973 | or returning). */ | |
488f131b JB |
6974 | keep_going (ecs); |
6975 | return; | |
6976 | } | |
c906108c | 6977 | |
14132e89 MR |
6978 | /* If we're in the return path from a shared library trampoline, |
6979 | we want to proceed through the trampoline when stepping. */ | |
6980 | /* macro/2012-04-25: This needs to come before the subroutine | |
6981 | call check below as on some targets return trampolines look | |
6982 | like subroutine calls (MIPS16 return thunks). */ | |
6983 | if (gdbarch_in_solib_return_trampoline (gdbarch, | |
1edb66d8 | 6984 | ecs->event_thread->stop_pc (), |
f2ffa92b | 6985 | ecs->stop_func_name) |
14132e89 MR |
6986 | && ecs->event_thread->control.step_over_calls != STEP_OVER_NONE) |
6987 | { | |
6988 | /* Determine where this trampoline returns. */ | |
1edb66d8 | 6989 | CORE_ADDR stop_pc = ecs->event_thread->stop_pc (); |
f2ffa92b PA |
6990 | CORE_ADDR real_stop_pc |
6991 | = gdbarch_skip_trampoline_code (gdbarch, frame, stop_pc); | |
14132e89 | 6992 | |
1eb8556f | 6993 | infrun_debug_printf ("stepped into solib return tramp"); |
14132e89 MR |
6994 | |
6995 | /* Only proceed through if we know where it's going. */ | |
6996 | if (real_stop_pc) | |
6997 | { | |
6998 | /* And put the step-breakpoint there and go until there. */ | |
51abb421 | 6999 | symtab_and_line sr_sal; |
14132e89 MR |
7000 | sr_sal.pc = real_stop_pc; |
7001 | sr_sal.section = find_pc_overlay (sr_sal.pc); | |
7002 | sr_sal.pspace = get_frame_program_space (frame); | |
7003 | ||
7004 | /* Do not specify what the fp should be when we stop since | |
7005 | on some machines the prologue is where the new fp value | |
7006 | is established. */ | |
7007 | insert_step_resume_breakpoint_at_sal (gdbarch, | |
7008 | sr_sal, null_frame_id); | |
7009 | ||
7010 | /* Restart without fiddling with the step ranges or | |
7011 | other state. */ | |
7012 | keep_going (ecs); | |
7013 | return; | |
7014 | } | |
7015 | } | |
7016 | ||
c17eaafe DJ |
7017 | /* Check for subroutine calls. The check for the current frame |
7018 | equalling the step ID is not necessary - the check of the | |
7019 | previous frame's ID is sufficient - but it is a common case and | |
7020 | cheaper than checking the previous frame's ID. | |
14e60db5 | 7021 | |
a0cbd650 | 7022 | NOTE: frame_id::operator== will never report two invalid frame IDs as |
14e60db5 DJ |
7023 | being equal, so to get into this block, both the current and |
7024 | previous frame must have valid frame IDs. */ | |
005ca36a JB |
7025 | /* The outer_frame_id check is a heuristic to detect stepping |
7026 | through startup code. If we step over an instruction which | |
7027 | sets the stack pointer from an invalid value to a valid value, | |
7028 | we may detect that as a subroutine call from the mythical | |
7029 | "outermost" function. This could be fixed by marking | |
7030 | outermost frames as !stack_p,code_p,special_p. Then the | |
7031 | initial outermost frame, before sp was valid, would | |
a0cbd650 | 7032 | have code_addr == &_start. See the comment in frame_id::operator== |
005ca36a | 7033 | for more. */ |
a0cbd650 TT |
7034 | if ((get_stack_frame_id (frame) |
7035 | != ecs->event_thread->control.step_stack_frame_id) | |
7036 | && ((frame_unwind_caller_id (get_current_frame ()) | |
7037 | == ecs->event_thread->control.step_stack_frame_id) | |
7038 | && ((ecs->event_thread->control.step_stack_frame_id | |
7039 | != outer_frame_id) | |
885eeb5b | 7040 | || (ecs->event_thread->control.step_start_function |
1edb66d8 | 7041 | != find_pc_function (ecs->event_thread->stop_pc ()))))) |
488f131b | 7042 | { |
1edb66d8 | 7043 | CORE_ADDR stop_pc = ecs->event_thread->stop_pc (); |
95918acb | 7044 | CORE_ADDR real_stop_pc; |
8fb3e588 | 7045 | |
1eb8556f | 7046 | infrun_debug_printf ("stepped into subroutine"); |
527159b7 | 7047 | |
b7a084be | 7048 | if (ecs->event_thread->control.step_over_calls == STEP_OVER_NONE) |
95918acb AC |
7049 | { |
7050 | /* I presume that step_over_calls is only 0 when we're | |
7051 | supposed to be stepping at the assembly language level | |
7052 | ("stepi"). Just stop. */ | |
388a8562 | 7053 | /* And this works the same backward as frontward. MVS */ |
bdc36728 | 7054 | end_stepping_range (ecs); |
95918acb AC |
7055 | return; |
7056 | } | |
8fb3e588 | 7057 | |
388a8562 MS |
7058 | /* Reverse stepping through solib trampolines. */ |
7059 | ||
7060 | if (execution_direction == EXEC_REVERSE | |
16c381f0 | 7061 | && ecs->event_thread->control.step_over_calls != STEP_OVER_NONE |
388a8562 MS |
7062 | && (gdbarch_skip_trampoline_code (gdbarch, frame, stop_pc) |
7063 | || (ecs->stop_func_start == 0 | |
7064 | && in_solib_dynsym_resolve_code (stop_pc)))) | |
7065 | { | |
7066 | /* Any solib trampoline code can be handled in reverse | |
7067 | by simply continuing to single-step. We have already | |
7068 | executed the solib function (backwards), and a few | |
7069 | steps will take us back through the trampoline to the | |
7070 | caller. */ | |
7071 | keep_going (ecs); | |
7072 | return; | |
7073 | } | |
7074 | ||
16c381f0 | 7075 | if (ecs->event_thread->control.step_over_calls == STEP_OVER_ALL) |
8567c30f | 7076 | { |
b2175913 MS |
7077 | /* We're doing a "next". |
7078 | ||
7079 | Normal (forward) execution: set a breakpoint at the | |
7080 | callee's return address (the address at which the caller | |
7081 | will resume). | |
7082 | ||
7083 | Reverse (backward) execution. set the step-resume | |
7084 | breakpoint at the start of the function that we just | |
7085 | stepped into (backwards), and continue to there. When we | |
6130d0b7 | 7086 | get there, we'll need to single-step back to the caller. */ |
b2175913 MS |
7087 | |
7088 | if (execution_direction == EXEC_REVERSE) | |
7089 | { | |
acf9414f JK |
7090 | /* If we're already at the start of the function, we've either |
7091 | just stepped backward into a single instruction function, | |
7092 | or stepped back out of a signal handler to the first instruction | |
7093 | of the function. Just keep going, which will single-step back | |
7094 | to the caller. */ | |
58c48e72 | 7095 | if (ecs->stop_func_start != stop_pc && ecs->stop_func_start != 0) |
acf9414f | 7096 | { |
acf9414f | 7097 | /* Normal function call return (static or dynamic). */ |
51abb421 | 7098 | symtab_and_line sr_sal; |
acf9414f JK |
7099 | sr_sal.pc = ecs->stop_func_start; |
7100 | sr_sal.pspace = get_frame_program_space (frame); | |
7101 | insert_step_resume_breakpoint_at_sal (gdbarch, | |
1f3e37e0 | 7102 | sr_sal, get_stack_frame_id (frame)); |
acf9414f | 7103 | } |
b2175913 MS |
7104 | } |
7105 | else | |
568d6575 | 7106 | insert_step_resume_breakpoint_at_caller (frame); |
b2175913 | 7107 | |
8567c30f AC |
7108 | keep_going (ecs); |
7109 | return; | |
7110 | } | |
a53c66de | 7111 | |
95918acb | 7112 | /* If we are in a function call trampoline (a stub between the |
dda83cd7 SM |
7113 | calling routine and the real function), locate the real |
7114 | function. That's what tells us (a) whether we want to step | |
7115 | into it at all, and (b) what prologue we want to run to the | |
7116 | end of, if we do step into it. */ | |
568d6575 | 7117 | real_stop_pc = skip_language_trampoline (frame, stop_pc); |
95918acb | 7118 | if (real_stop_pc == 0) |
568d6575 | 7119 | real_stop_pc = gdbarch_skip_trampoline_code (gdbarch, frame, stop_pc); |
95918acb AC |
7120 | if (real_stop_pc != 0) |
7121 | ecs->stop_func_start = real_stop_pc; | |
8fb3e588 | 7122 | |
db5f024e | 7123 | if (real_stop_pc != 0 && in_solib_dynsym_resolve_code (real_stop_pc)) |
1b2bfbb9 | 7124 | { |
51abb421 | 7125 | symtab_and_line sr_sal; |
1b2bfbb9 | 7126 | sr_sal.pc = ecs->stop_func_start; |
6c95b8df | 7127 | sr_sal.pspace = get_frame_program_space (frame); |
1b2bfbb9 | 7128 | |
a6d9a66e UW |
7129 | insert_step_resume_breakpoint_at_sal (gdbarch, |
7130 | sr_sal, null_frame_id); | |
8fb3e588 AC |
7131 | keep_going (ecs); |
7132 | return; | |
1b2bfbb9 RC |
7133 | } |
7134 | ||
95918acb | 7135 | /* If we have line number information for the function we are |
1bfeeb0f JL |
7136 | thinking of stepping into and the function isn't on the skip |
7137 | list, step into it. | |
95918acb | 7138 | |
dda83cd7 SM |
7139 | If there are several symtabs at that PC (e.g. with include |
7140 | files), just want to know whether *any* of them have line | |
7141 | numbers. find_pc_line handles this. */ | |
95918acb AC |
7142 | { |
7143 | struct symtab_and_line tmp_sal; | |
8fb3e588 | 7144 | |
95918acb | 7145 | tmp_sal = find_pc_line (ecs->stop_func_start, 0); |
2b914b52 | 7146 | if (tmp_sal.line != 0 |
85817405 | 7147 | && !function_name_is_marked_for_skip (ecs->stop_func_name, |
4a4c04f1 BE |
7148 | tmp_sal) |
7149 | && !inline_frame_is_marked_for_skip (true, ecs->event_thread)) | |
95918acb | 7150 | { |
b2175913 | 7151 | if (execution_direction == EXEC_REVERSE) |
568d6575 | 7152 | handle_step_into_function_backward (gdbarch, ecs); |
b2175913 | 7153 | else |
568d6575 | 7154 | handle_step_into_function (gdbarch, ecs); |
95918acb AC |
7155 | return; |
7156 | } | |
7157 | } | |
7158 | ||
7159 | /* If we have no line number and the step-stop-if-no-debug is | |
dda83cd7 SM |
7160 | set, we stop the step so that the user has a chance to switch |
7161 | in assembly mode. */ | |
16c381f0 | 7162 | if (ecs->event_thread->control.step_over_calls == STEP_OVER_UNDEBUGGABLE |
078130d0 | 7163 | && step_stop_if_no_debug) |
95918acb | 7164 | { |
bdc36728 | 7165 | end_stepping_range (ecs); |
95918acb AC |
7166 | return; |
7167 | } | |
7168 | ||
b2175913 MS |
7169 | if (execution_direction == EXEC_REVERSE) |
7170 | { | |
acf9414f JK |
7171 | /* If we're already at the start of the function, we've either just |
7172 | stepped backward into a single instruction function without line | |
7173 | number info, or stepped back out of a signal handler to the first | |
7174 | instruction of the function without line number info. Just keep | |
7175 | going, which will single-step back to the caller. */ | |
7176 | if (ecs->stop_func_start != stop_pc) | |
7177 | { | |
7178 | /* Set a breakpoint at callee's start address. | |
7179 | From there we can step once and be back in the caller. */ | |
51abb421 | 7180 | symtab_and_line sr_sal; |
acf9414f JK |
7181 | sr_sal.pc = ecs->stop_func_start; |
7182 | sr_sal.pspace = get_frame_program_space (frame); | |
7183 | insert_step_resume_breakpoint_at_sal (gdbarch, | |
7184 | sr_sal, null_frame_id); | |
7185 | } | |
b2175913 MS |
7186 | } |
7187 | else | |
7188 | /* Set a breakpoint at callee's return address (the address | |
7189 | at which the caller will resume). */ | |
568d6575 | 7190 | insert_step_resume_breakpoint_at_caller (frame); |
b2175913 | 7191 | |
95918acb | 7192 | keep_going (ecs); |
488f131b | 7193 | return; |
488f131b | 7194 | } |
c906108c | 7195 | |
fdd654f3 MS |
7196 | /* Reverse stepping through solib trampolines. */ |
7197 | ||
7198 | if (execution_direction == EXEC_REVERSE | |
16c381f0 | 7199 | && ecs->event_thread->control.step_over_calls != STEP_OVER_NONE) |
fdd654f3 | 7200 | { |
1edb66d8 | 7201 | CORE_ADDR stop_pc = ecs->event_thread->stop_pc (); |
f2ffa92b | 7202 | |
fdd654f3 MS |
7203 | if (gdbarch_skip_trampoline_code (gdbarch, frame, stop_pc) |
7204 | || (ecs->stop_func_start == 0 | |
7205 | && in_solib_dynsym_resolve_code (stop_pc))) | |
7206 | { | |
7207 | /* Any solib trampoline code can be handled in reverse | |
7208 | by simply continuing to single-step. We have already | |
7209 | executed the solib function (backwards), and a few | |
7210 | steps will take us back through the trampoline to the | |
7211 | caller. */ | |
7212 | keep_going (ecs); | |
7213 | return; | |
7214 | } | |
7215 | else if (in_solib_dynsym_resolve_code (stop_pc)) | |
7216 | { | |
7217 | /* Stepped backward into the solib dynsym resolver. | |
7218 | Set a breakpoint at its start and continue, then | |
7219 | one more step will take us out. */ | |
51abb421 | 7220 | symtab_and_line sr_sal; |
fdd654f3 | 7221 | sr_sal.pc = ecs->stop_func_start; |
9d1807c3 | 7222 | sr_sal.pspace = get_frame_program_space (frame); |
fdd654f3 MS |
7223 | insert_step_resume_breakpoint_at_sal (gdbarch, |
7224 | sr_sal, null_frame_id); | |
7225 | keep_going (ecs); | |
7226 | return; | |
7227 | } | |
7228 | } | |
7229 | ||
8c95582d AB |
7230 | /* This always returns the sal for the inner-most frame when we are in a |
7231 | stack of inlined frames, even if GDB actually believes that it is in a | |
7232 | more outer frame. This is checked for below by calls to | |
7233 | inline_skipped_frames. */ | |
1edb66d8 | 7234 | stop_pc_sal = find_pc_line (ecs->event_thread->stop_pc (), 0); |
7ed0fe66 | 7235 | |
1b2bfbb9 RC |
7236 | /* NOTE: tausq/2004-05-24: This if block used to be done before all |
7237 | the trampoline processing logic, however, there are some trampolines | |
7238 | that have no names, so we should do trampoline handling first. */ | |
16c381f0 | 7239 | if (ecs->event_thread->control.step_over_calls == STEP_OVER_UNDEBUGGABLE |
03acd4d8 | 7240 | && ecs->stop_func_name == nullptr |
2afb61aa | 7241 | && stop_pc_sal.line == 0) |
1b2bfbb9 | 7242 | { |
1eb8556f | 7243 | infrun_debug_printf ("stepped into undebuggable function"); |
527159b7 | 7244 | |
1b2bfbb9 | 7245 | /* The inferior just stepped into, or returned to, an |
dda83cd7 SM |
7246 | undebuggable function (where there is no debugging information |
7247 | and no line number corresponding to the address where the | |
7248 | inferior stopped). Since we want to skip this kind of code, | |
7249 | we keep going until the inferior returns from this | |
7250 | function - unless the user has asked us not to (via | |
7251 | set step-mode) or we no longer know how to get back | |
7252 | to the call site. */ | |
14e60db5 | 7253 | if (step_stop_if_no_debug |
c7ce8faa | 7254 | || !frame_id_p (frame_unwind_caller_id (frame))) |
1b2bfbb9 RC |
7255 | { |
7256 | /* If we have no line number and the step-stop-if-no-debug | |
7257 | is set, we stop the step so that the user has a chance to | |
7258 | switch in assembly mode. */ | |
bdc36728 | 7259 | end_stepping_range (ecs); |
1b2bfbb9 RC |
7260 | return; |
7261 | } | |
7262 | else | |
7263 | { | |
7264 | /* Set a breakpoint at callee's return address (the address | |
7265 | at which the caller will resume). */ | |
568d6575 | 7266 | insert_step_resume_breakpoint_at_caller (frame); |
1b2bfbb9 RC |
7267 | keep_going (ecs); |
7268 | return; | |
7269 | } | |
7270 | } | |
7271 | ||
16c381f0 | 7272 | if (ecs->event_thread->control.step_range_end == 1) |
1b2bfbb9 RC |
7273 | { |
7274 | /* It is stepi or nexti. We always want to stop stepping after | |
dda83cd7 | 7275 | one instruction. */ |
1eb8556f | 7276 | infrun_debug_printf ("stepi/nexti"); |
bdc36728 | 7277 | end_stepping_range (ecs); |
1b2bfbb9 RC |
7278 | return; |
7279 | } | |
7280 | ||
2afb61aa | 7281 | if (stop_pc_sal.line == 0) |
488f131b JB |
7282 | { |
7283 | /* We have no line number information. That means to stop | |
dda83cd7 SM |
7284 | stepping (does this always happen right after one instruction, |
7285 | when we do "s" in a function with no line numbers, | |
7286 | or can this happen as a result of a return or longjmp?). */ | |
1eb8556f | 7287 | infrun_debug_printf ("line number info"); |
bdc36728 | 7288 | end_stepping_range (ecs); |
488f131b JB |
7289 | return; |
7290 | } | |
c906108c | 7291 | |
edb3359d DJ |
7292 | /* Look for "calls" to inlined functions, part one. If the inline |
7293 | frame machinery detected some skipped call sites, we have entered | |
7294 | a new inline function. */ | |
7295 | ||
a0cbd650 TT |
7296 | if ((get_frame_id (get_current_frame ()) |
7297 | == ecs->event_thread->control.step_frame_id) | |
00431a78 | 7298 | && inline_skipped_frames (ecs->event_thread)) |
edb3359d | 7299 | { |
1eb8556f | 7300 | infrun_debug_printf ("stepped into inlined function"); |
edb3359d | 7301 | |
51abb421 | 7302 | symtab_and_line call_sal = find_frame_sal (get_current_frame ()); |
edb3359d | 7303 | |
16c381f0 | 7304 | if (ecs->event_thread->control.step_over_calls != STEP_OVER_ALL) |
edb3359d DJ |
7305 | { |
7306 | /* For "step", we're going to stop. But if the call site | |
7307 | for this inlined function is on the same source line as | |
7308 | we were previously stepping, go down into the function | |
7309 | first. Otherwise stop at the call site. */ | |
7310 | ||
7311 | if (call_sal.line == ecs->event_thread->current_line | |
7312 | && call_sal.symtab == ecs->event_thread->current_symtab) | |
4a4c04f1 BE |
7313 | { |
7314 | step_into_inline_frame (ecs->event_thread); | |
7315 | if (inline_frame_is_marked_for_skip (false, ecs->event_thread)) | |
7316 | { | |
7317 | keep_going (ecs); | |
7318 | return; | |
7319 | } | |
7320 | } | |
edb3359d | 7321 | |
bdc36728 | 7322 | end_stepping_range (ecs); |
edb3359d DJ |
7323 | return; |
7324 | } | |
7325 | else | |
7326 | { | |
7327 | /* For "next", we should stop at the call site if it is on a | |
7328 | different source line. Otherwise continue through the | |
7329 | inlined function. */ | |
7330 | if (call_sal.line == ecs->event_thread->current_line | |
7331 | && call_sal.symtab == ecs->event_thread->current_symtab) | |
7332 | keep_going (ecs); | |
7333 | else | |
bdc36728 | 7334 | end_stepping_range (ecs); |
edb3359d DJ |
7335 | return; |
7336 | } | |
7337 | } | |
7338 | ||
7339 | /* Look for "calls" to inlined functions, part two. If we are still | |
7340 | in the same real function we were stepping through, but we have | |
7341 | to go further up to find the exact frame ID, we are stepping | |
7342 | through a more inlined call beyond its call site. */ | |
7343 | ||
7344 | if (get_frame_type (get_current_frame ()) == INLINE_FRAME | |
a0cbd650 TT |
7345 | && (get_frame_id (get_current_frame ()) |
7346 | != ecs->event_thread->control.step_frame_id) | |
edb3359d | 7347 | && stepped_in_from (get_current_frame (), |
16c381f0 | 7348 | ecs->event_thread->control.step_frame_id)) |
edb3359d | 7349 | { |
1eb8556f | 7350 | infrun_debug_printf ("stepping through inlined function"); |
edb3359d | 7351 | |
4a4c04f1 BE |
7352 | if (ecs->event_thread->control.step_over_calls == STEP_OVER_ALL |
7353 | || inline_frame_is_marked_for_skip (false, ecs->event_thread)) | |
edb3359d DJ |
7354 | keep_going (ecs); |
7355 | else | |
bdc36728 | 7356 | end_stepping_range (ecs); |
edb3359d DJ |
7357 | return; |
7358 | } | |
7359 | ||
8c95582d | 7360 | bool refresh_step_info = true; |
1edb66d8 | 7361 | if ((ecs->event_thread->stop_pc () == stop_pc_sal.pc) |
4e1c45ea | 7362 | && (ecs->event_thread->current_line != stop_pc_sal.line |
24b21115 | 7363 | || ecs->event_thread->current_symtab != stop_pc_sal.symtab)) |
488f131b | 7364 | { |
ebde6f2d TV |
7365 | /* We are at a different line. */ |
7366 | ||
8c95582d AB |
7367 | if (stop_pc_sal.is_stmt) |
7368 | { | |
ebde6f2d TV |
7369 | /* We are at the start of a statement. |
7370 | ||
7371 | So stop. Note that we don't stop if we step into the middle of a | |
7372 | statement. That is said to make things like for (;;) statements | |
7373 | work better. */ | |
1eb8556f | 7374 | infrun_debug_printf ("stepped to a different line"); |
8c95582d AB |
7375 | end_stepping_range (ecs); |
7376 | return; | |
7377 | } | |
a0cbd650 TT |
7378 | else if (get_frame_id (get_current_frame ()) |
7379 | == ecs->event_thread->control.step_frame_id) | |
8c95582d | 7380 | { |
ebde6f2d TV |
7381 | /* We are not at the start of a statement, and we have not changed |
7382 | frame. | |
7383 | ||
7384 | We ignore this line table entry, and continue stepping forward, | |
8c95582d AB |
7385 | looking for a better place to stop. */ |
7386 | refresh_step_info = false; | |
1eb8556f SM |
7387 | infrun_debug_printf ("stepped to a different line, but " |
7388 | "it's not the start of a statement"); | |
8c95582d | 7389 | } |
ebde6f2d TV |
7390 | else |
7391 | { | |
7392 | /* We are not the start of a statement, and we have changed frame. | |
7393 | ||
7394 | We ignore this line table entry, and continue stepping forward, | |
7395 | looking for a better place to stop. Keep refresh_step_info at | |
7396 | true to note that the frame has changed, but ignore the line | |
7397 | number to make sure we don't ignore a subsequent entry with the | |
7398 | same line number. */ | |
7399 | stop_pc_sal.line = 0; | |
7400 | infrun_debug_printf ("stepped to a different frame, but " | |
7401 | "it's not the start of a statement"); | |
7402 | } | |
488f131b | 7403 | } |
c906108c | 7404 | |
488f131b | 7405 | /* We aren't done stepping. |
c906108c | 7406 | |
488f131b JB |
7407 | Optimize by setting the stepping range to the line. |
7408 | (We might not be in the original line, but if we entered a | |
7409 | new line in mid-statement, we continue stepping. This makes | |
8c95582d AB |
7410 | things like for(;;) statements work better.) |
7411 | ||
7412 | If we entered a SAL that indicates a non-statement line table entry, | |
7413 | then we update the stepping range, but we don't update the step info, | |
7414 | which includes things like the line number we are stepping away from. | |
7415 | This means we will stop when we find a line table entry that is marked | |
7416 | as is-statement, even if it matches the non-statement one we just | |
7417 | stepped into. */ | |
c906108c | 7418 | |
16c381f0 JK |
7419 | ecs->event_thread->control.step_range_start = stop_pc_sal.pc; |
7420 | ecs->event_thread->control.step_range_end = stop_pc_sal.end; | |
c1e36e3e | 7421 | ecs->event_thread->control.may_range_step = 1; |
c8353d68 AB |
7422 | infrun_debug_printf |
7423 | ("updated step range, start = %s, end = %s, may_range_step = %d", | |
7424 | paddress (gdbarch, ecs->event_thread->control.step_range_start), | |
7425 | paddress (gdbarch, ecs->event_thread->control.step_range_end), | |
7426 | ecs->event_thread->control.may_range_step); | |
8c95582d AB |
7427 | if (refresh_step_info) |
7428 | set_step_info (ecs->event_thread, frame, stop_pc_sal); | |
488f131b | 7429 | |
1eb8556f | 7430 | infrun_debug_printf ("keep going"); |
488f131b | 7431 | keep_going (ecs); |
104c1213 JM |
7432 | } |
7433 | ||
408f6686 PA |
7434 | static bool restart_stepped_thread (process_stratum_target *resume_target, |
7435 | ptid_t resume_ptid); | |
7436 | ||
c447ac0b PA |
7437 | /* In all-stop mode, if we're currently stepping but have stopped in |
7438 | some other thread, we may need to switch back to the stepped | |
7439 | thread. Returns true we set the inferior running, false if we left | |
7440 | it stopped (and the event needs further processing). */ | |
7441 | ||
c4464ade | 7442 | static bool |
c447ac0b PA |
7443 | switch_back_to_stepped_thread (struct execution_control_state *ecs) |
7444 | { | |
fbea99ea | 7445 | if (!target_is_non_stop_p ()) |
c447ac0b | 7446 | { |
99619bea PA |
7447 | /* If any thread is blocked on some internal breakpoint, and we |
7448 | simply need to step over that breakpoint to get it going | |
7449 | again, do that first. */ | |
7450 | ||
7451 | /* However, if we see an event for the stepping thread, then we | |
7452 | know all other threads have been moved past their breakpoints | |
7453 | already. Let the caller check whether the step is finished, | |
7454 | etc., before deciding to move it past a breakpoint. */ | |
7455 | if (ecs->event_thread->control.step_range_end != 0) | |
c4464ade | 7456 | return false; |
99619bea PA |
7457 | |
7458 | /* Check if the current thread is blocked on an incomplete | |
7459 | step-over, interrupted by a random signal. */ | |
7460 | if (ecs->event_thread->control.trap_expected | |
1edb66d8 | 7461 | && ecs->event_thread->stop_signal () != GDB_SIGNAL_TRAP) |
c447ac0b | 7462 | { |
1eb8556f SM |
7463 | infrun_debug_printf |
7464 | ("need to finish step-over of [%s]", | |
0fab7955 | 7465 | ecs->event_thread->ptid.to_string ().c_str ()); |
99619bea | 7466 | keep_going (ecs); |
c4464ade | 7467 | return true; |
99619bea | 7468 | } |
2adfaa28 | 7469 | |
99619bea PA |
7470 | /* Check if the current thread is blocked by a single-step |
7471 | breakpoint of another thread. */ | |
7472 | if (ecs->hit_singlestep_breakpoint) | |
7473 | { | |
1eb8556f | 7474 | infrun_debug_printf ("need to step [%s] over single-step breakpoint", |
0fab7955 | 7475 | ecs->ptid.to_string ().c_str ()); |
99619bea | 7476 | keep_going (ecs); |
c4464ade | 7477 | return true; |
99619bea PA |
7478 | } |
7479 | ||
4d9d9d04 PA |
7480 | /* If this thread needs yet another step-over (e.g., stepping |
7481 | through a delay slot), do it first before moving on to | |
7482 | another thread. */ | |
7483 | if (thread_still_needs_step_over (ecs->event_thread)) | |
7484 | { | |
1eb8556f SM |
7485 | infrun_debug_printf |
7486 | ("thread [%s] still needs step-over", | |
0fab7955 | 7487 | ecs->event_thread->ptid.to_string ().c_str ()); |
4d9d9d04 | 7488 | keep_going (ecs); |
c4464ade | 7489 | return true; |
4d9d9d04 | 7490 | } |
70509625 | 7491 | |
483805cf PA |
7492 | /* If scheduler locking applies even if not stepping, there's no |
7493 | need to walk over threads. Above we've checked whether the | |
7494 | current thread is stepping. If some other thread not the | |
7495 | event thread is stepping, then it must be that scheduler | |
7496 | locking is not in effect. */ | |
856e7dd6 | 7497 | if (schedlock_applies (ecs->event_thread)) |
c4464ade | 7498 | return false; |
483805cf | 7499 | |
4d9d9d04 PA |
7500 | /* Otherwise, we no longer expect a trap in the current thread. |
7501 | Clear the trap_expected flag before switching back -- this is | |
7502 | what keep_going does as well, if we call it. */ | |
7503 | ecs->event_thread->control.trap_expected = 0; | |
7504 | ||
7505 | /* Likewise, clear the signal if it should not be passed. */ | |
1edb66d8 SM |
7506 | if (!signal_program[ecs->event_thread->stop_signal ()]) |
7507 | ecs->event_thread->set_stop_signal (GDB_SIGNAL_0); | |
4d9d9d04 | 7508 | |
408f6686 | 7509 | if (restart_stepped_thread (ecs->target, ecs->ptid)) |
4d9d9d04 PA |
7510 | { |
7511 | prepare_to_wait (ecs); | |
c4464ade | 7512 | return true; |
4d9d9d04 PA |
7513 | } |
7514 | ||
408f6686 PA |
7515 | switch_to_thread (ecs->event_thread); |
7516 | } | |
4d9d9d04 | 7517 | |
408f6686 PA |
7518 | return false; |
7519 | } | |
f3f8ece4 | 7520 | |
408f6686 PA |
7521 | /* Look for the thread that was stepping, and resume it. |
7522 | RESUME_TARGET / RESUME_PTID indicate the set of threads the caller | |
7523 | is resuming. Return true if a thread was started, false | |
7524 | otherwise. */ | |
483805cf | 7525 | |
408f6686 PA |
7526 | static bool |
7527 | restart_stepped_thread (process_stratum_target *resume_target, | |
7528 | ptid_t resume_ptid) | |
7529 | { | |
7530 | /* Do all pending step-overs before actually proceeding with | |
7531 | step/next/etc. */ | |
7532 | if (start_step_over ()) | |
7533 | return true; | |
483805cf | 7534 | |
408f6686 PA |
7535 | for (thread_info *tp : all_threads_safe ()) |
7536 | { | |
7537 | if (tp->state == THREAD_EXITED) | |
7538 | continue; | |
7539 | ||
1edb66d8 | 7540 | if (tp->has_pending_waitstatus ()) |
408f6686 | 7541 | continue; |
483805cf | 7542 | |
408f6686 PA |
7543 | /* Ignore threads of processes the caller is not |
7544 | resuming. */ | |
7545 | if (!sched_multi | |
7546 | && (tp->inf->process_target () != resume_target | |
7547 | || tp->inf->pid != resume_ptid.pid ())) | |
7548 | continue; | |
483805cf | 7549 | |
408f6686 PA |
7550 | if (tp->control.trap_expected) |
7551 | { | |
7552 | infrun_debug_printf ("switching back to stepped thread (step-over)"); | |
483805cf | 7553 | |
408f6686 PA |
7554 | if (keep_going_stepped_thread (tp)) |
7555 | return true; | |
99619bea | 7556 | } |
408f6686 PA |
7557 | } |
7558 | ||
7559 | for (thread_info *tp : all_threads_safe ()) | |
7560 | { | |
7561 | if (tp->state == THREAD_EXITED) | |
7562 | continue; | |
7563 | ||
1edb66d8 | 7564 | if (tp->has_pending_waitstatus ()) |
408f6686 | 7565 | continue; |
99619bea | 7566 | |
408f6686 PA |
7567 | /* Ignore threads of processes the caller is not |
7568 | resuming. */ | |
7569 | if (!sched_multi | |
7570 | && (tp->inf->process_target () != resume_target | |
7571 | || tp->inf->pid != resume_ptid.pid ())) | |
7572 | continue; | |
7573 | ||
7574 | /* Did we find the stepping thread? */ | |
7575 | if (tp->control.step_range_end) | |
99619bea | 7576 | { |
408f6686 | 7577 | infrun_debug_printf ("switching back to stepped thread (stepping)"); |
c447ac0b | 7578 | |
408f6686 PA |
7579 | if (keep_going_stepped_thread (tp)) |
7580 | return true; | |
2ac7589c PA |
7581 | } |
7582 | } | |
2adfaa28 | 7583 | |
c4464ade | 7584 | return false; |
2ac7589c | 7585 | } |
2adfaa28 | 7586 | |
408f6686 PA |
7587 | /* See infrun.h. */ |
7588 | ||
7589 | void | |
7590 | restart_after_all_stop_detach (process_stratum_target *proc_target) | |
7591 | { | |
7592 | /* Note we don't check target_is_non_stop_p() here, because the | |
7593 | current inferior may no longer have a process_stratum target | |
7594 | pushed, as we just detached. */ | |
7595 | ||
7596 | /* See if we have a THREAD_RUNNING thread that need to be | |
7597 | re-resumed. If we have any thread that is already executing, | |
7598 | then we don't need to resume the target -- it is already been | |
7599 | resumed. With the remote target (in all-stop), it's even | |
7600 | impossible to issue another resumption if the target is already | |
7601 | resumed, until the target reports a stop. */ | |
7602 | for (thread_info *thr : all_threads (proc_target)) | |
7603 | { | |
7604 | if (thr->state != THREAD_RUNNING) | |
7605 | continue; | |
7606 | ||
7607 | /* If we have any thread that is already executing, then we | |
7608 | don't need to resume the target -- it is already been | |
7609 | resumed. */ | |
611841bb | 7610 | if (thr->executing ()) |
408f6686 PA |
7611 | return; |
7612 | ||
7613 | /* If we have a pending event to process, skip resuming the | |
7614 | target and go straight to processing it. */ | |
1edb66d8 | 7615 | if (thr->resumed () && thr->has_pending_waitstatus ()) |
408f6686 PA |
7616 | return; |
7617 | } | |
7618 | ||
7619 | /* Alright, we need to re-resume the target. If a thread was | |
7620 | stepping, we need to restart it stepping. */ | |
7621 | if (restart_stepped_thread (proc_target, minus_one_ptid)) | |
7622 | return; | |
7623 | ||
7624 | /* Otherwise, find the first THREAD_RUNNING thread and resume | |
7625 | it. */ | |
7626 | for (thread_info *thr : all_threads (proc_target)) | |
7627 | { | |
7628 | if (thr->state != THREAD_RUNNING) | |
7629 | continue; | |
7630 | ||
aa563d16 | 7631 | execution_control_state ecs (thr); |
408f6686 PA |
7632 | switch_to_thread (thr); |
7633 | keep_going (&ecs); | |
7634 | return; | |
7635 | } | |
7636 | } | |
7637 | ||
2ac7589c PA |
7638 | /* Set a previously stepped thread back to stepping. Returns true on |
7639 | success, false if the resume is not possible (e.g., the thread | |
7640 | vanished). */ | |
7641 | ||
c4464ade | 7642 | static bool |
2ac7589c PA |
7643 | keep_going_stepped_thread (struct thread_info *tp) |
7644 | { | |
bd2b40ac | 7645 | frame_info_ptr frame; |
2adfaa28 | 7646 | |
2ac7589c PA |
7647 | /* If the stepping thread exited, then don't try to switch back and |
7648 | resume it, which could fail in several different ways depending | |
7649 | on the target. Instead, just keep going. | |
2adfaa28 | 7650 | |
2ac7589c PA |
7651 | We can find a stepping dead thread in the thread list in two |
7652 | cases: | |
2adfaa28 | 7653 | |
2ac7589c PA |
7654 | - The target supports thread exit events, and when the target |
7655 | tries to delete the thread from the thread list, inferior_ptid | |
7656 | pointed at the exiting thread. In such case, calling | |
7657 | delete_thread does not really remove the thread from the list; | |
7658 | instead, the thread is left listed, with 'exited' state. | |
64ce06e4 | 7659 | |
2ac7589c PA |
7660 | - The target's debug interface does not support thread exit |
7661 | events, and so we have no idea whatsoever if the previously | |
7662 | stepping thread is still alive. For that reason, we need to | |
7663 | synchronously query the target now. */ | |
2adfaa28 | 7664 | |
00431a78 | 7665 | if (tp->state == THREAD_EXITED || !target_thread_alive (tp->ptid)) |
2ac7589c | 7666 | { |
1eb8556f SM |
7667 | infrun_debug_printf ("not resuming previously stepped thread, it has " |
7668 | "vanished"); | |
2ac7589c | 7669 | |
00431a78 | 7670 | delete_thread (tp); |
c4464ade | 7671 | return false; |
c447ac0b | 7672 | } |
2ac7589c | 7673 | |
1eb8556f | 7674 | infrun_debug_printf ("resuming previously stepped thread"); |
2ac7589c | 7675 | |
aa563d16 | 7676 | execution_control_state ecs (tp); |
00431a78 | 7677 | switch_to_thread (tp); |
2ac7589c | 7678 | |
1edb66d8 | 7679 | tp->set_stop_pc (regcache_read_pc (get_thread_regcache (tp))); |
2ac7589c | 7680 | frame = get_current_frame (); |
2ac7589c PA |
7681 | |
7682 | /* If the PC of the thread we were trying to single-step has | |
7683 | changed, then that thread has trapped or been signaled, but the | |
7684 | event has not been reported to GDB yet. Re-poll the target | |
7685 | looking for this particular thread's event (i.e. temporarily | |
7686 | enable schedlock) by: | |
7687 | ||
7688 | - setting a break at the current PC | |
7689 | - resuming that particular thread, only (by setting trap | |
7690 | expected) | |
7691 | ||
7692 | This prevents us continuously moving the single-step breakpoint | |
7693 | forward, one instruction at a time, overstepping. */ | |
7694 | ||
1edb66d8 | 7695 | if (tp->stop_pc () != tp->prev_pc) |
2ac7589c PA |
7696 | { |
7697 | ptid_t resume_ptid; | |
7698 | ||
1eb8556f SM |
7699 | infrun_debug_printf ("expected thread advanced also (%s -> %s)", |
7700 | paddress (target_gdbarch (), tp->prev_pc), | |
1edb66d8 | 7701 | paddress (target_gdbarch (), tp->stop_pc ())); |
2ac7589c PA |
7702 | |
7703 | /* Clear the info of the previous step-over, as it's no longer | |
7704 | valid (if the thread was trying to step over a breakpoint, it | |
7705 | has already succeeded). It's what keep_going would do too, | |
7706 | if we called it. Do this before trying to insert the sss | |
7707 | breakpoint, otherwise if we were previously trying to step | |
7708 | over this exact address in another thread, the breakpoint is | |
7709 | skipped. */ | |
7710 | clear_step_over_info (); | |
7711 | tp->control.trap_expected = 0; | |
7712 | ||
7713 | insert_single_step_breakpoint (get_frame_arch (frame), | |
7714 | get_frame_address_space (frame), | |
1edb66d8 | 7715 | tp->stop_pc ()); |
2ac7589c | 7716 | |
7846f3aa | 7717 | tp->set_resumed (true); |
fbea99ea | 7718 | resume_ptid = internal_resume_ptid (tp->control.stepping_command); |
c4464ade | 7719 | do_target_resume (resume_ptid, false, GDB_SIGNAL_0); |
2ac7589c PA |
7720 | } |
7721 | else | |
7722 | { | |
1eb8556f | 7723 | infrun_debug_printf ("expected thread still hasn't advanced"); |
2ac7589c | 7724 | |
aa563d16 | 7725 | keep_going_pass_signal (&ecs); |
2ac7589c | 7726 | } |
c4464ade SM |
7727 | |
7728 | return true; | |
c447ac0b PA |
7729 | } |
7730 | ||
8b061563 PA |
7731 | /* Is thread TP in the middle of (software or hardware) |
7732 | single-stepping? (Note the result of this function must never be | |
7733 | passed directly as target_resume's STEP parameter.) */ | |
104c1213 | 7734 | |
c4464ade | 7735 | static bool |
b3444185 | 7736 | currently_stepping (struct thread_info *tp) |
a7212384 | 7737 | { |
8358c15c | 7738 | return ((tp->control.step_range_end |
03acd4d8 | 7739 | && tp->control.step_resume_breakpoint == nullptr) |
8358c15c | 7740 | || tp->control.trap_expected |
af48d08f | 7741 | || tp->stepped_breakpoint |
8358c15c | 7742 | || bpstat_should_step ()); |
a7212384 UW |
7743 | } |
7744 | ||
b2175913 MS |
7745 | /* Inferior has stepped into a subroutine call with source code that |
7746 | we should not step over. Do step to the first line of code in | |
7747 | it. */ | |
c2c6d25f JM |
7748 | |
7749 | static void | |
568d6575 UW |
7750 | handle_step_into_function (struct gdbarch *gdbarch, |
7751 | struct execution_control_state *ecs) | |
c2c6d25f | 7752 | { |
7e324e48 GB |
7753 | fill_in_stop_func (gdbarch, ecs); |
7754 | ||
f2ffa92b | 7755 | compunit_symtab *cust |
1edb66d8 | 7756 | = find_pc_compunit_symtab (ecs->event_thread->stop_pc ()); |
03acd4d8 | 7757 | if (cust != nullptr && cust->language () != language_asm) |
46a62268 YQ |
7758 | ecs->stop_func_start |
7759 | = gdbarch_skip_prologue_noexcept (gdbarch, ecs->stop_func_start); | |
c2c6d25f | 7760 | |
51abb421 | 7761 | symtab_and_line stop_func_sal = find_pc_line (ecs->stop_func_start, 0); |
c2c6d25f JM |
7762 | /* Use the step_resume_break to step until the end of the prologue, |
7763 | even if that involves jumps (as it seems to on the vax under | |
7764 | 4.2). */ | |
7765 | /* If the prologue ends in the middle of a source line, continue to | |
7766 | the end of that source line (if it is still within the function). | |
7767 | Otherwise, just go to end of prologue. */ | |
2afb61aa PA |
7768 | if (stop_func_sal.end |
7769 | && stop_func_sal.pc != ecs->stop_func_start | |
7770 | && stop_func_sal.end < ecs->stop_func_end) | |
7771 | ecs->stop_func_start = stop_func_sal.end; | |
c2c6d25f | 7772 | |
2dbd5e30 KB |
7773 | /* Architectures which require breakpoint adjustment might not be able |
7774 | to place a breakpoint at the computed address. If so, the test | |
7775 | ``ecs->stop_func_start == stop_pc'' will never succeed. Adjust | |
7776 | ecs->stop_func_start to an address at which a breakpoint may be | |
7777 | legitimately placed. | |
8fb3e588 | 7778 | |
2dbd5e30 KB |
7779 | Note: kevinb/2004-01-19: On FR-V, if this adjustment is not |
7780 | made, GDB will enter an infinite loop when stepping through | |
7781 | optimized code consisting of VLIW instructions which contain | |
7782 | subinstructions corresponding to different source lines. On | |
7783 | FR-V, it's not permitted to place a breakpoint on any but the | |
7784 | first subinstruction of a VLIW instruction. When a breakpoint is | |
7785 | set, GDB will adjust the breakpoint address to the beginning of | |
7786 | the VLIW instruction. Thus, we need to make the corresponding | |
7787 | adjustment here when computing the stop address. */ | |
8fb3e588 | 7788 | |
568d6575 | 7789 | if (gdbarch_adjust_breakpoint_address_p (gdbarch)) |
2dbd5e30 KB |
7790 | { |
7791 | ecs->stop_func_start | |
568d6575 | 7792 | = gdbarch_adjust_breakpoint_address (gdbarch, |
8fb3e588 | 7793 | ecs->stop_func_start); |
2dbd5e30 KB |
7794 | } |
7795 | ||
1edb66d8 | 7796 | if (ecs->stop_func_start == ecs->event_thread->stop_pc ()) |
c2c6d25f JM |
7797 | { |
7798 | /* We are already there: stop now. */ | |
bdc36728 | 7799 | end_stepping_range (ecs); |
c2c6d25f JM |
7800 | return; |
7801 | } | |
7802 | else | |
7803 | { | |
7804 | /* Put the step-breakpoint there and go until there. */ | |
51abb421 | 7805 | symtab_and_line sr_sal; |
c2c6d25f JM |
7806 | sr_sal.pc = ecs->stop_func_start; |
7807 | sr_sal.section = find_pc_overlay (ecs->stop_func_start); | |
6c95b8df | 7808 | sr_sal.pspace = get_frame_program_space (get_current_frame ()); |
44cbf7b5 | 7809 | |
c2c6d25f | 7810 | /* Do not specify what the fp should be when we stop since on |
dda83cd7 SM |
7811 | some machines the prologue is where the new fp value is |
7812 | established. */ | |
a6d9a66e | 7813 | insert_step_resume_breakpoint_at_sal (gdbarch, sr_sal, null_frame_id); |
c2c6d25f JM |
7814 | |
7815 | /* And make sure stepping stops right away then. */ | |
16c381f0 | 7816 | ecs->event_thread->control.step_range_end |
dda83cd7 | 7817 | = ecs->event_thread->control.step_range_start; |
c2c6d25f JM |
7818 | } |
7819 | keep_going (ecs); | |
7820 | } | |
d4f3574e | 7821 | |
b2175913 MS |
7822 | /* Inferior has stepped backward into a subroutine call with source |
7823 | code that we should not step over. Do step to the beginning of the | |
7824 | last line of code in it. */ | |
7825 | ||
7826 | static void | |
568d6575 UW |
7827 | handle_step_into_function_backward (struct gdbarch *gdbarch, |
7828 | struct execution_control_state *ecs) | |
b2175913 | 7829 | { |
43f3e411 | 7830 | struct compunit_symtab *cust; |
167e4384 | 7831 | struct symtab_and_line stop_func_sal; |
b2175913 | 7832 | |
7e324e48 GB |
7833 | fill_in_stop_func (gdbarch, ecs); |
7834 | ||
1edb66d8 | 7835 | cust = find_pc_compunit_symtab (ecs->event_thread->stop_pc ()); |
03acd4d8 | 7836 | if (cust != nullptr && cust->language () != language_asm) |
46a62268 YQ |
7837 | ecs->stop_func_start |
7838 | = gdbarch_skip_prologue_noexcept (gdbarch, ecs->stop_func_start); | |
b2175913 | 7839 | |
1edb66d8 | 7840 | stop_func_sal = find_pc_line (ecs->event_thread->stop_pc (), 0); |
b2175913 MS |
7841 | |
7842 | /* OK, we're just going to keep stepping here. */ | |
1edb66d8 | 7843 | if (stop_func_sal.pc == ecs->event_thread->stop_pc ()) |
b2175913 MS |
7844 | { |
7845 | /* We're there already. Just stop stepping now. */ | |
bdc36728 | 7846 | end_stepping_range (ecs); |
b2175913 MS |
7847 | } |
7848 | else | |
7849 | { | |
7850 | /* Else just reset the step range and keep going. | |
7851 | No step-resume breakpoint, they don't work for | |
7852 | epilogues, which can have multiple entry paths. */ | |
16c381f0 JK |
7853 | ecs->event_thread->control.step_range_start = stop_func_sal.pc; |
7854 | ecs->event_thread->control.step_range_end = stop_func_sal.end; | |
b2175913 MS |
7855 | keep_going (ecs); |
7856 | } | |
7857 | return; | |
7858 | } | |
7859 | ||
d3169d93 | 7860 | /* Insert a "step-resume breakpoint" at SR_SAL with frame ID SR_ID. |
44cbf7b5 AC |
7861 | This is used to both functions and to skip over code. */ |
7862 | ||
7863 | static void | |
2c03e5be PA |
7864 | insert_step_resume_breakpoint_at_sal_1 (struct gdbarch *gdbarch, |
7865 | struct symtab_and_line sr_sal, | |
7866 | struct frame_id sr_id, | |
7867 | enum bptype sr_type) | |
44cbf7b5 | 7868 | { |
611c83ae PA |
7869 | /* There should never be more than one step-resume or longjmp-resume |
7870 | breakpoint per thread, so we should never be setting a new | |
44cbf7b5 | 7871 | step_resume_breakpoint when one is already active. */ |
03acd4d8 | 7872 | gdb_assert (inferior_thread ()->control.step_resume_breakpoint == nullptr); |
2c03e5be | 7873 | gdb_assert (sr_type == bp_step_resume || sr_type == bp_hp_step_resume); |
d3169d93 | 7874 | |
1eb8556f SM |
7875 | infrun_debug_printf ("inserting step-resume breakpoint at %s", |
7876 | paddress (gdbarch, sr_sal.pc)); | |
d3169d93 | 7877 | |
8358c15c | 7878 | inferior_thread ()->control.step_resume_breakpoint |
454dafbd | 7879 | = set_momentary_breakpoint (gdbarch, sr_sal, sr_id, sr_type).release (); |
2c03e5be PA |
7880 | } |
7881 | ||
9da8c2a0 | 7882 | void |
2c03e5be PA |
7883 | insert_step_resume_breakpoint_at_sal (struct gdbarch *gdbarch, |
7884 | struct symtab_and_line sr_sal, | |
7885 | struct frame_id sr_id) | |
7886 | { | |
7887 | insert_step_resume_breakpoint_at_sal_1 (gdbarch, | |
7888 | sr_sal, sr_id, | |
7889 | bp_step_resume); | |
44cbf7b5 | 7890 | } |
7ce450bd | 7891 | |
2c03e5be PA |
7892 | /* Insert a "high-priority step-resume breakpoint" at RETURN_FRAME.pc. |
7893 | This is used to skip a potential signal handler. | |
7ce450bd | 7894 | |
14e60db5 DJ |
7895 | This is called with the interrupted function's frame. The signal |
7896 | handler, when it returns, will resume the interrupted function at | |
7897 | RETURN_FRAME.pc. */ | |
d303a6c7 AC |
7898 | |
7899 | static void | |
bd2b40ac | 7900 | insert_hp_step_resume_breakpoint_at_frame (frame_info_ptr return_frame) |
d303a6c7 | 7901 | { |
03acd4d8 | 7902 | gdb_assert (return_frame != nullptr); |
d303a6c7 | 7903 | |
51abb421 PA |
7904 | struct gdbarch *gdbarch = get_frame_arch (return_frame); |
7905 | ||
7906 | symtab_and_line sr_sal; | |
568d6575 | 7907 | sr_sal.pc = gdbarch_addr_bits_remove (gdbarch, get_frame_pc (return_frame)); |
d303a6c7 | 7908 | sr_sal.section = find_pc_overlay (sr_sal.pc); |
6c95b8df | 7909 | sr_sal.pspace = get_frame_program_space (return_frame); |
d303a6c7 | 7910 | |
2c03e5be PA |
7911 | insert_step_resume_breakpoint_at_sal_1 (gdbarch, sr_sal, |
7912 | get_stack_frame_id (return_frame), | |
7913 | bp_hp_step_resume); | |
d303a6c7 AC |
7914 | } |
7915 | ||
2c03e5be PA |
7916 | /* Insert a "step-resume breakpoint" at the previous frame's PC. This |
7917 | is used to skip a function after stepping into it (for "next" or if | |
7918 | the called function has no debugging information). | |
14e60db5 DJ |
7919 | |
7920 | The current function has almost always been reached by single | |
7921 | stepping a call or return instruction. NEXT_FRAME belongs to the | |
7922 | current function, and the breakpoint will be set at the caller's | |
7923 | resume address. | |
7924 | ||
7925 | This is a separate function rather than reusing | |
2c03e5be | 7926 | insert_hp_step_resume_breakpoint_at_frame in order to avoid |
14e60db5 | 7927 | get_prev_frame, which may stop prematurely (see the implementation |
c7ce8faa | 7928 | of frame_unwind_caller_id for an example). */ |
14e60db5 DJ |
7929 | |
7930 | static void | |
bd2b40ac | 7931 | insert_step_resume_breakpoint_at_caller (frame_info_ptr next_frame) |
14e60db5 | 7932 | { |
14e60db5 DJ |
7933 | /* We shouldn't have gotten here if we don't know where the call site |
7934 | is. */ | |
c7ce8faa | 7935 | gdb_assert (frame_id_p (frame_unwind_caller_id (next_frame))); |
14e60db5 | 7936 | |
51abb421 | 7937 | struct gdbarch *gdbarch = frame_unwind_caller_arch (next_frame); |
14e60db5 | 7938 | |
51abb421 | 7939 | symtab_and_line sr_sal; |
c7ce8faa DJ |
7940 | sr_sal.pc = gdbarch_addr_bits_remove (gdbarch, |
7941 | frame_unwind_caller_pc (next_frame)); | |
14e60db5 | 7942 | sr_sal.section = find_pc_overlay (sr_sal.pc); |
6c95b8df | 7943 | sr_sal.pspace = frame_unwind_program_space (next_frame); |
14e60db5 | 7944 | |
a6d9a66e | 7945 | insert_step_resume_breakpoint_at_sal (gdbarch, sr_sal, |
c7ce8faa | 7946 | frame_unwind_caller_id (next_frame)); |
14e60db5 DJ |
7947 | } |
7948 | ||
611c83ae PA |
7949 | /* Insert a "longjmp-resume" breakpoint at PC. This is used to set a |
7950 | new breakpoint at the target of a jmp_buf. The handling of | |
7951 | longjmp-resume uses the same mechanisms used for handling | |
7952 | "step-resume" breakpoints. */ | |
7953 | ||
7954 | static void | |
a6d9a66e | 7955 | insert_longjmp_resume_breakpoint (struct gdbarch *gdbarch, CORE_ADDR pc) |
611c83ae | 7956 | { |
e81a37f7 TT |
7957 | /* There should never be more than one longjmp-resume breakpoint per |
7958 | thread, so we should never be setting a new | |
611c83ae | 7959 | longjmp_resume_breakpoint when one is already active. */ |
03acd4d8 | 7960 | gdb_assert (inferior_thread ()->control.exception_resume_breakpoint == nullptr); |
611c83ae | 7961 | |
1eb8556f SM |
7962 | infrun_debug_printf ("inserting longjmp-resume breakpoint at %s", |
7963 | paddress (gdbarch, pc)); | |
611c83ae | 7964 | |
e81a37f7 | 7965 | inferior_thread ()->control.exception_resume_breakpoint = |
454dafbd | 7966 | set_momentary_breakpoint_at_pc (gdbarch, pc, bp_longjmp_resume).release (); |
611c83ae PA |
7967 | } |
7968 | ||
186c406b TT |
7969 | /* Insert an exception resume breakpoint. TP is the thread throwing |
7970 | the exception. The block B is the block of the unwinder debug hook | |
7971 | function. FRAME is the frame corresponding to the call to this | |
7972 | function. SYM is the symbol of the function argument holding the | |
7973 | target PC of the exception. */ | |
7974 | ||
7975 | static void | |
7976 | insert_exception_resume_breakpoint (struct thread_info *tp, | |
3977b71f | 7977 | const struct block *b, |
bd2b40ac | 7978 | frame_info_ptr frame, |
186c406b TT |
7979 | struct symbol *sym) |
7980 | { | |
a70b8144 | 7981 | try |
186c406b | 7982 | { |
63e43d3a | 7983 | struct block_symbol vsym; |
186c406b TT |
7984 | struct value *value; |
7985 | CORE_ADDR handler; | |
7986 | struct breakpoint *bp; | |
7987 | ||
987012b8 | 7988 | vsym = lookup_symbol_search_name (sym->search_name (), |
de63c46b | 7989 | b, VAR_DOMAIN); |
63e43d3a | 7990 | value = read_var_value (vsym.symbol, vsym.block, frame); |
186c406b TT |
7991 | /* If the value was optimized out, revert to the old behavior. */ |
7992 | if (! value_optimized_out (value)) | |
7993 | { | |
7994 | handler = value_as_address (value); | |
7995 | ||
1eb8556f SM |
7996 | infrun_debug_printf ("exception resume at %lx", |
7997 | (unsigned long) handler); | |
186c406b TT |
7998 | |
7999 | bp = set_momentary_breakpoint_at_pc (get_frame_arch (frame), | |
454dafbd TT |
8000 | handler, |
8001 | bp_exception_resume).release (); | |
c70a6932 JK |
8002 | |
8003 | /* set_momentary_breakpoint_at_pc invalidates FRAME. */ | |
03acd4d8 | 8004 | frame = nullptr; |
c70a6932 | 8005 | |
5d5658a1 | 8006 | bp->thread = tp->global_num; |
186c406b TT |
8007 | inferior_thread ()->control.exception_resume_breakpoint = bp; |
8008 | } | |
8009 | } | |
230d2906 | 8010 | catch (const gdb_exception_error &e) |
492d29ea PA |
8011 | { |
8012 | /* We want to ignore errors here. */ | |
8013 | } | |
186c406b TT |
8014 | } |
8015 | ||
28106bc2 SDJ |
8016 | /* A helper for check_exception_resume that sets an |
8017 | exception-breakpoint based on a SystemTap probe. */ | |
8018 | ||
8019 | static void | |
8020 | insert_exception_resume_from_probe (struct thread_info *tp, | |
729662a5 | 8021 | const struct bound_probe *probe, |
bd2b40ac | 8022 | frame_info_ptr frame) |
28106bc2 SDJ |
8023 | { |
8024 | struct value *arg_value; | |
8025 | CORE_ADDR handler; | |
8026 | struct breakpoint *bp; | |
8027 | ||
8028 | arg_value = probe_safe_evaluate_at_pc (frame, 1); | |
8029 | if (!arg_value) | |
8030 | return; | |
8031 | ||
8032 | handler = value_as_address (arg_value); | |
8033 | ||
1eb8556f SM |
8034 | infrun_debug_printf ("exception resume at %s", |
8035 | paddress (probe->objfile->arch (), handler)); | |
28106bc2 SDJ |
8036 | |
8037 | bp = set_momentary_breakpoint_at_pc (get_frame_arch (frame), | |
454dafbd | 8038 | handler, bp_exception_resume).release (); |
5d5658a1 | 8039 | bp->thread = tp->global_num; |
28106bc2 SDJ |
8040 | inferior_thread ()->control.exception_resume_breakpoint = bp; |
8041 | } | |
8042 | ||
186c406b TT |
8043 | /* This is called when an exception has been intercepted. Check to |
8044 | see whether the exception's destination is of interest, and if so, | |
8045 | set an exception resume breakpoint there. */ | |
8046 | ||
8047 | static void | |
8048 | check_exception_resume (struct execution_control_state *ecs, | |
bd2b40ac | 8049 | frame_info_ptr frame) |
186c406b | 8050 | { |
729662a5 | 8051 | struct bound_probe probe; |
28106bc2 SDJ |
8052 | struct symbol *func; |
8053 | ||
8054 | /* First see if this exception unwinding breakpoint was set via a | |
8055 | SystemTap probe point. If so, the probe has two arguments: the | |
8056 | CFA and the HANDLER. We ignore the CFA, extract the handler, and | |
8057 | set a breakpoint there. */ | |
6bac7473 | 8058 | probe = find_probe_by_pc (get_frame_pc (frame)); |
935676c9 | 8059 | if (probe.prob) |
28106bc2 | 8060 | { |
729662a5 | 8061 | insert_exception_resume_from_probe (ecs->event_thread, &probe, frame); |
28106bc2 SDJ |
8062 | return; |
8063 | } | |
8064 | ||
8065 | func = get_frame_function (frame); | |
8066 | if (!func) | |
8067 | return; | |
186c406b | 8068 | |
a70b8144 | 8069 | try |
186c406b | 8070 | { |
3977b71f | 8071 | const struct block *b; |
8157b174 | 8072 | struct block_iterator iter; |
186c406b TT |
8073 | struct symbol *sym; |
8074 | int argno = 0; | |
8075 | ||
8076 | /* The exception breakpoint is a thread-specific breakpoint on | |
8077 | the unwinder's debug hook, declared as: | |
8078 | ||
8079 | void _Unwind_DebugHook (void *cfa, void *handler); | |
8080 | ||
8081 | The CFA argument indicates the frame to which control is | |
8082 | about to be transferred. HANDLER is the destination PC. | |
8083 | ||
8084 | We ignore the CFA and set a temporary breakpoint at HANDLER. | |
8085 | This is not extremely efficient but it avoids issues in gdb | |
8086 | with computing the DWARF CFA, and it also works even in weird | |
8087 | cases such as throwing an exception from inside a signal | |
8088 | handler. */ | |
8089 | ||
4aeddc50 | 8090 | b = func->value_block (); |
186c406b TT |
8091 | ALL_BLOCK_SYMBOLS (b, iter, sym) |
8092 | { | |
d9743061 | 8093 | if (!sym->is_argument ()) |
186c406b TT |
8094 | continue; |
8095 | ||
8096 | if (argno == 0) | |
8097 | ++argno; | |
8098 | else | |
8099 | { | |
8100 | insert_exception_resume_breakpoint (ecs->event_thread, | |
8101 | b, frame, sym); | |
8102 | break; | |
8103 | } | |
8104 | } | |
8105 | } | |
230d2906 | 8106 | catch (const gdb_exception_error &e) |
492d29ea PA |
8107 | { |
8108 | } | |
186c406b TT |
8109 | } |
8110 | ||
104c1213 | 8111 | static void |
22bcd14b | 8112 | stop_waiting (struct execution_control_state *ecs) |
104c1213 | 8113 | { |
1eb8556f | 8114 | infrun_debug_printf ("stop_waiting"); |
527159b7 | 8115 | |
cd0fc7c3 SS |
8116 | /* Let callers know we don't want to wait for the inferior anymore. */ |
8117 | ecs->wait_some_more = 0; | |
8118 | } | |
8119 | ||
4d9d9d04 PA |
8120 | /* Like keep_going, but passes the signal to the inferior, even if the |
8121 | signal is set to nopass. */ | |
d4f3574e SS |
8122 | |
8123 | static void | |
4d9d9d04 | 8124 | keep_going_pass_signal (struct execution_control_state *ecs) |
d4f3574e | 8125 | { |
d7e15655 | 8126 | gdb_assert (ecs->event_thread->ptid == inferior_ptid); |
7846f3aa | 8127 | gdb_assert (!ecs->event_thread->resumed ()); |
4d9d9d04 | 8128 | |
d4f3574e | 8129 | /* Save the pc before execution, to compare with pc after stop. */ |
fb14de7b | 8130 | ecs->event_thread->prev_pc |
fc75c28b | 8131 | = regcache_read_pc_protected (get_thread_regcache (ecs->event_thread)); |
d4f3574e | 8132 | |
4d9d9d04 | 8133 | if (ecs->event_thread->control.trap_expected) |
d4f3574e | 8134 | { |
4d9d9d04 PA |
8135 | struct thread_info *tp = ecs->event_thread; |
8136 | ||
1eb8556f SM |
8137 | infrun_debug_printf ("%s has trap_expected set, " |
8138 | "resuming to collect trap", | |
0fab7955 | 8139 | tp->ptid.to_string ().c_str ()); |
4d9d9d04 | 8140 | |
a9ba6bae PA |
8141 | /* We haven't yet gotten our trap, and either: intercepted a |
8142 | non-signal event (e.g., a fork); or took a signal which we | |
8143 | are supposed to pass through to the inferior. Simply | |
8144 | continue. */ | |
1edb66d8 | 8145 | resume (ecs->event_thread->stop_signal ()); |
d4f3574e | 8146 | } |
372316f1 PA |
8147 | else if (step_over_info_valid_p ()) |
8148 | { | |
8149 | /* Another thread is stepping over a breakpoint in-line. If | |
8150 | this thread needs a step-over too, queue the request. In | |
8151 | either case, this resume must be deferred for later. */ | |
8152 | struct thread_info *tp = ecs->event_thread; | |
8153 | ||
8154 | if (ecs->hit_singlestep_breakpoint | |
8155 | || thread_still_needs_step_over (tp)) | |
8156 | { | |
1eb8556f SM |
8157 | infrun_debug_printf ("step-over already in progress: " |
8158 | "step-over for %s deferred", | |
0fab7955 | 8159 | tp->ptid.to_string ().c_str ()); |
28d5518b | 8160 | global_thread_step_over_chain_enqueue (tp); |
372316f1 PA |
8161 | } |
8162 | else | |
0fab7955 SM |
8163 | infrun_debug_printf ("step-over in progress: resume of %s deferred", |
8164 | tp->ptid.to_string ().c_str ()); | |
372316f1 | 8165 | } |
d4f3574e SS |
8166 | else |
8167 | { | |
31e77af2 | 8168 | struct regcache *regcache = get_current_regcache (); |
963f9c80 PA |
8169 | int remove_bp; |
8170 | int remove_wps; | |
8d297bbf | 8171 | step_over_what step_what; |
31e77af2 | 8172 | |
d4f3574e | 8173 | /* Either the trap was not expected, but we are continuing |
a9ba6bae PA |
8174 | anyway (if we got a signal, the user asked it be passed to |
8175 | the child) | |
8176 | -- or -- | |
8177 | We got our expected trap, but decided we should resume from | |
8178 | it. | |
d4f3574e | 8179 | |
a9ba6bae | 8180 | We're going to run this baby now! |
d4f3574e | 8181 | |
c36b740a VP |
8182 | Note that insert_breakpoints won't try to re-insert |
8183 | already inserted breakpoints. Therefore, we don't | |
8184 | care if breakpoints were already inserted, or not. */ | |
a9ba6bae | 8185 | |
31e77af2 PA |
8186 | /* If we need to step over a breakpoint, and we're not using |
8187 | displaced stepping to do so, insert all breakpoints | |
8188 | (watchpoints, etc.) but the one we're stepping over, step one | |
8189 | instruction, and then re-insert the breakpoint when that step | |
8190 | is finished. */ | |
963f9c80 | 8191 | |
6c4cfb24 PA |
8192 | step_what = thread_still_needs_step_over (ecs->event_thread); |
8193 | ||
963f9c80 | 8194 | remove_bp = (ecs->hit_singlestep_breakpoint |
6c4cfb24 PA |
8195 | || (step_what & STEP_OVER_BREAKPOINT)); |
8196 | remove_wps = (step_what & STEP_OVER_WATCHPOINT); | |
963f9c80 | 8197 | |
cb71640d PA |
8198 | /* We can't use displaced stepping if we need to step past a |
8199 | watchpoint. The instruction copied to the scratch pad would | |
8200 | still trigger the watchpoint. */ | |
8201 | if (remove_bp | |
3fc8eb30 | 8202 | && (remove_wps || !use_displaced_stepping (ecs->event_thread))) |
45e8c884 | 8203 | { |
a01bda52 | 8204 | set_step_over_info (regcache->aspace (), |
21edc42f YQ |
8205 | regcache_read_pc (regcache), remove_wps, |
8206 | ecs->event_thread->global_num); | |
45e8c884 | 8207 | } |
963f9c80 | 8208 | else if (remove_wps) |
03acd4d8 | 8209 | set_step_over_info (nullptr, 0, remove_wps, -1); |
372316f1 PA |
8210 | |
8211 | /* If we now need to do an in-line step-over, we need to stop | |
8212 | all other threads. Note this must be done before | |
8213 | insert_breakpoints below, because that removes the breakpoint | |
8214 | we're about to step over, otherwise other threads could miss | |
8215 | it. */ | |
fbea99ea | 8216 | if (step_over_info_valid_p () && target_is_non_stop_p ()) |
4f5539f0 | 8217 | stop_all_threads ("starting in-line step-over"); |
abbb1732 | 8218 | |
31e77af2 | 8219 | /* Stop stepping if inserting breakpoints fails. */ |
a70b8144 | 8220 | try |
31e77af2 PA |
8221 | { |
8222 | insert_breakpoints (); | |
8223 | } | |
230d2906 | 8224 | catch (const gdb_exception_error &e) |
31e77af2 PA |
8225 | { |
8226 | exception_print (gdb_stderr, e); | |
22bcd14b | 8227 | stop_waiting (ecs); |
bdf2a94a | 8228 | clear_step_over_info (); |
31e77af2 | 8229 | return; |
d4f3574e SS |
8230 | } |
8231 | ||
963f9c80 | 8232 | ecs->event_thread->control.trap_expected = (remove_bp || remove_wps); |
d4f3574e | 8233 | |
1edb66d8 | 8234 | resume (ecs->event_thread->stop_signal ()); |
d4f3574e SS |
8235 | } |
8236 | ||
488f131b | 8237 | prepare_to_wait (ecs); |
d4f3574e SS |
8238 | } |
8239 | ||
4d9d9d04 PA |
8240 | /* Called when we should continue running the inferior, because the |
8241 | current event doesn't cause a user visible stop. This does the | |
8242 | resuming part; waiting for the next event is done elsewhere. */ | |
8243 | ||
8244 | static void | |
8245 | keep_going (struct execution_control_state *ecs) | |
8246 | { | |
8247 | if (ecs->event_thread->control.trap_expected | |
1edb66d8 | 8248 | && ecs->event_thread->stop_signal () == GDB_SIGNAL_TRAP) |
4d9d9d04 PA |
8249 | ecs->event_thread->control.trap_expected = 0; |
8250 | ||
1edb66d8 SM |
8251 | if (!signal_program[ecs->event_thread->stop_signal ()]) |
8252 | ecs->event_thread->set_stop_signal (GDB_SIGNAL_0); | |
4d9d9d04 PA |
8253 | keep_going_pass_signal (ecs); |
8254 | } | |
8255 | ||
104c1213 JM |
8256 | /* This function normally comes after a resume, before |
8257 | handle_inferior_event exits. It takes care of any last bits of | |
8258 | housekeeping, and sets the all-important wait_some_more flag. */ | |
cd0fc7c3 | 8259 | |
104c1213 JM |
8260 | static void |
8261 | prepare_to_wait (struct execution_control_state *ecs) | |
cd0fc7c3 | 8262 | { |
1eb8556f | 8263 | infrun_debug_printf ("prepare_to_wait"); |
104c1213 | 8264 | |
104c1213 | 8265 | ecs->wait_some_more = 1; |
0b333c5e | 8266 | |
42bd97a6 PA |
8267 | /* If the target can't async, emulate it by marking the infrun event |
8268 | handler such that as soon as we get back to the event-loop, we | |
8269 | immediately end up in fetch_inferior_event again calling | |
8270 | target_wait. */ | |
8271 | if (!target_can_async_p ()) | |
0b333c5e | 8272 | mark_infrun_async_event_handler (); |
c906108c | 8273 | } |
11cf8741 | 8274 | |
fd664c91 | 8275 | /* We are done with the step range of a step/next/si/ni command. |
b57bacec | 8276 | Called once for each n of a "step n" operation. */ |
fd664c91 PA |
8277 | |
8278 | static void | |
bdc36728 | 8279 | end_stepping_range (struct execution_control_state *ecs) |
fd664c91 | 8280 | { |
bdc36728 | 8281 | ecs->event_thread->control.stop_step = 1; |
bdc36728 | 8282 | stop_waiting (ecs); |
fd664c91 PA |
8283 | } |
8284 | ||
33d62d64 JK |
8285 | /* Several print_*_reason functions to print why the inferior has stopped. |
8286 | We always print something when the inferior exits, or receives a signal. | |
8287 | The rest of the cases are dealt with later on in normal_stop and | |
8288 | print_it_typical. Ideally there should be a call to one of these | |
8289 | print_*_reason functions functions from handle_inferior_event each time | |
22bcd14b | 8290 | stop_waiting is called. |
33d62d64 | 8291 | |
fd664c91 PA |
8292 | Note that we don't call these directly, instead we delegate that to |
8293 | the interpreters, through observers. Interpreters then call these | |
8294 | with whatever uiout is right. */ | |
33d62d64 | 8295 | |
fd664c91 PA |
8296 | void |
8297 | print_end_stepping_range_reason (struct ui_out *uiout) | |
33d62d64 | 8298 | { |
fd664c91 | 8299 | /* For CLI-like interpreters, print nothing. */ |
33d62d64 | 8300 | |
112e8700 | 8301 | if (uiout->is_mi_like_p ()) |
fd664c91 | 8302 | { |
112e8700 | 8303 | uiout->field_string ("reason", |
fd664c91 PA |
8304 | async_reason_lookup (EXEC_ASYNC_END_STEPPING_RANGE)); |
8305 | } | |
8306 | } | |
33d62d64 | 8307 | |
fd664c91 PA |
8308 | void |
8309 | print_signal_exited_reason (struct ui_out *uiout, enum gdb_signal siggnal) | |
11cf8741 | 8310 | { |
33d62d64 | 8311 | annotate_signalled (); |
112e8700 SM |
8312 | if (uiout->is_mi_like_p ()) |
8313 | uiout->field_string | |
8314 | ("reason", async_reason_lookup (EXEC_ASYNC_EXITED_SIGNALLED)); | |
8315 | uiout->text ("\nProgram terminated with signal "); | |
33d62d64 | 8316 | annotate_signal_name (); |
112e8700 | 8317 | uiout->field_string ("signal-name", |
2ea28649 | 8318 | gdb_signal_to_name (siggnal)); |
33d62d64 | 8319 | annotate_signal_name_end (); |
112e8700 | 8320 | uiout->text (", "); |
33d62d64 | 8321 | annotate_signal_string (); |
112e8700 | 8322 | uiout->field_string ("signal-meaning", |
2ea28649 | 8323 | gdb_signal_to_string (siggnal)); |
33d62d64 | 8324 | annotate_signal_string_end (); |
112e8700 SM |
8325 | uiout->text (".\n"); |
8326 | uiout->text ("The program no longer exists.\n"); | |
33d62d64 JK |
8327 | } |
8328 | ||
fd664c91 PA |
8329 | void |
8330 | print_exited_reason (struct ui_out *uiout, int exitstatus) | |
33d62d64 | 8331 | { |
fda326dd | 8332 | struct inferior *inf = current_inferior (); |
a068643d | 8333 | std::string pidstr = target_pid_to_str (ptid_t (inf->pid)); |
fda326dd | 8334 | |
33d62d64 JK |
8335 | annotate_exited (exitstatus); |
8336 | if (exitstatus) | |
8337 | { | |
112e8700 SM |
8338 | if (uiout->is_mi_like_p ()) |
8339 | uiout->field_string ("reason", async_reason_lookup (EXEC_ASYNC_EXITED)); | |
6a831f06 PA |
8340 | std::string exit_code_str |
8341 | = string_printf ("0%o", (unsigned int) exitstatus); | |
8342 | uiout->message ("[Inferior %s (%s) exited with code %pF]\n", | |
8343 | plongest (inf->num), pidstr.c_str (), | |
8344 | string_field ("exit-code", exit_code_str.c_str ())); | |
33d62d64 JK |
8345 | } |
8346 | else | |
11cf8741 | 8347 | { |
112e8700 SM |
8348 | if (uiout->is_mi_like_p ()) |
8349 | uiout->field_string | |
8350 | ("reason", async_reason_lookup (EXEC_ASYNC_EXITED_NORMALLY)); | |
6a831f06 PA |
8351 | uiout->message ("[Inferior %s (%s) exited normally]\n", |
8352 | plongest (inf->num), pidstr.c_str ()); | |
33d62d64 | 8353 | } |
33d62d64 JK |
8354 | } |
8355 | ||
fd664c91 PA |
8356 | void |
8357 | print_signal_received_reason (struct ui_out *uiout, enum gdb_signal siggnal) | |
33d62d64 | 8358 | { |
f303dbd6 PA |
8359 | struct thread_info *thr = inferior_thread (); |
8360 | ||
bb079752 AB |
8361 | infrun_debug_printf ("signal = %s", gdb_signal_to_string (siggnal)); |
8362 | ||
33d62d64 JK |
8363 | annotate_signal (); |
8364 | ||
112e8700 | 8365 | if (uiout->is_mi_like_p ()) |
f303dbd6 PA |
8366 | ; |
8367 | else if (show_thread_that_caused_stop ()) | |
33d62d64 | 8368 | { |
112e8700 | 8369 | uiout->text ("\nThread "); |
33eca680 | 8370 | uiout->field_string ("thread-id", print_thread_id (thr)); |
f303dbd6 | 8371 | |
25558938 | 8372 | const char *name = thread_name (thr); |
03acd4d8 | 8373 | if (name != nullptr) |
f303dbd6 | 8374 | { |
112e8700 | 8375 | uiout->text (" \""); |
33eca680 | 8376 | uiout->field_string ("name", name); |
112e8700 | 8377 | uiout->text ("\""); |
f303dbd6 | 8378 | } |
33d62d64 | 8379 | } |
f303dbd6 | 8380 | else |
112e8700 | 8381 | uiout->text ("\nProgram"); |
f303dbd6 | 8382 | |
112e8700 SM |
8383 | if (siggnal == GDB_SIGNAL_0 && !uiout->is_mi_like_p ()) |
8384 | uiout->text (" stopped"); | |
33d62d64 JK |
8385 | else |
8386 | { | |
112e8700 | 8387 | uiout->text (" received signal "); |
8b93c638 | 8388 | annotate_signal_name (); |
112e8700 SM |
8389 | if (uiout->is_mi_like_p ()) |
8390 | uiout->field_string | |
8391 | ("reason", async_reason_lookup (EXEC_ASYNC_SIGNAL_RECEIVED)); | |
8392 | uiout->field_string ("signal-name", gdb_signal_to_name (siggnal)); | |
8b93c638 | 8393 | annotate_signal_name_end (); |
112e8700 | 8394 | uiout->text (", "); |
8b93c638 | 8395 | annotate_signal_string (); |
112e8700 | 8396 | uiout->field_string ("signal-meaning", gdb_signal_to_string (siggnal)); |
012b3a21 | 8397 | |
272bb05c JB |
8398 | struct regcache *regcache = get_current_regcache (); |
8399 | struct gdbarch *gdbarch = regcache->arch (); | |
8400 | if (gdbarch_report_signal_info_p (gdbarch)) | |
8401 | gdbarch_report_signal_info (gdbarch, uiout, siggnal); | |
8402 | ||
8b93c638 | 8403 | annotate_signal_string_end (); |
33d62d64 | 8404 | } |
112e8700 | 8405 | uiout->text (".\n"); |
33d62d64 | 8406 | } |
252fbfc8 | 8407 | |
fd664c91 PA |
8408 | void |
8409 | print_no_history_reason (struct ui_out *uiout) | |
33d62d64 | 8410 | { |
37f54063 BL |
8411 | if (uiout->is_mi_like_p ()) |
8412 | uiout->field_string ("reason", async_reason_lookup (EXEC_ASYNC_NO_HISTORY)); | |
8413 | else | |
8414 | uiout->text ("\nNo more reverse-execution history.\n"); | |
11cf8741 | 8415 | } |
43ff13b4 | 8416 | |
0c7e1a46 PA |
8417 | /* Print current location without a level number, if we have changed |
8418 | functions or hit a breakpoint. Print source line if we have one. | |
8419 | bpstat_print contains the logic deciding in detail what to print, | |
8420 | based on the event(s) that just occurred. */ | |
8421 | ||
243a9253 | 8422 | static void |
c272a98c | 8423 | print_stop_location (const target_waitstatus &ws) |
0c7e1a46 PA |
8424 | { |
8425 | int bpstat_ret; | |
f486487f | 8426 | enum print_what source_flag; |
0c7e1a46 PA |
8427 | int do_frame_printing = 1; |
8428 | struct thread_info *tp = inferior_thread (); | |
8429 | ||
c272a98c | 8430 | bpstat_ret = bpstat_print (tp->control.stop_bpstat, ws.kind ()); |
0c7e1a46 PA |
8431 | switch (bpstat_ret) |
8432 | { | |
8433 | case PRINT_UNKNOWN: | |
8434 | /* FIXME: cagney/2002-12-01: Given that a frame ID does (or | |
8435 | should) carry around the function and does (or should) use | |
8436 | that when doing a frame comparison. */ | |
8437 | if (tp->control.stop_step | |
a0cbd650 TT |
8438 | && (tp->control.step_frame_id |
8439 | == get_frame_id (get_current_frame ())) | |
f2ffa92b | 8440 | && (tp->control.step_start_function |
1edb66d8 | 8441 | == find_pc_function (tp->stop_pc ()))) |
0c7e1a46 PA |
8442 | { |
8443 | /* Finished step, just print source line. */ | |
8444 | source_flag = SRC_LINE; | |
8445 | } | |
8446 | else | |
8447 | { | |
8448 | /* Print location and source line. */ | |
8449 | source_flag = SRC_AND_LOC; | |
8450 | } | |
8451 | break; | |
8452 | case PRINT_SRC_AND_LOC: | |
8453 | /* Print location and source line. */ | |
8454 | source_flag = SRC_AND_LOC; | |
8455 | break; | |
8456 | case PRINT_SRC_ONLY: | |
8457 | source_flag = SRC_LINE; | |
8458 | break; | |
8459 | case PRINT_NOTHING: | |
8460 | /* Something bogus. */ | |
8461 | source_flag = SRC_LINE; | |
8462 | do_frame_printing = 0; | |
8463 | break; | |
8464 | default: | |
f34652de | 8465 | internal_error (_("Unknown value.")); |
0c7e1a46 PA |
8466 | } |
8467 | ||
8468 | /* The behavior of this routine with respect to the source | |
8469 | flag is: | |
8470 | SRC_LINE: Print only source line | |
8471 | LOCATION: Print only location | |
8472 | SRC_AND_LOC: Print location and source line. */ | |
8473 | if (do_frame_printing) | |
03acd4d8 | 8474 | print_stack_frame (get_selected_frame (nullptr), 0, source_flag, 1); |
243a9253 PA |
8475 | } |
8476 | ||
243a9253 PA |
8477 | /* See infrun.h. */ |
8478 | ||
8479 | void | |
4c7d57e7 | 8480 | print_stop_event (struct ui_out *uiout, bool displays) |
243a9253 | 8481 | { |
243a9253 | 8482 | struct target_waitstatus last; |
243a9253 PA |
8483 | struct thread_info *tp; |
8484 | ||
5b6d1e4f | 8485 | get_last_target_status (nullptr, nullptr, &last); |
243a9253 | 8486 | |
67ad9399 TT |
8487 | { |
8488 | scoped_restore save_uiout = make_scoped_restore (¤t_uiout, uiout); | |
0c7e1a46 | 8489 | |
c272a98c | 8490 | print_stop_location (last); |
243a9253 | 8491 | |
67ad9399 | 8492 | /* Display the auto-display expressions. */ |
4c7d57e7 TT |
8493 | if (displays) |
8494 | do_displays (); | |
67ad9399 | 8495 | } |
243a9253 PA |
8496 | |
8497 | tp = inferior_thread (); | |
573269a8 LS |
8498 | if (tp->thread_fsm () != nullptr |
8499 | && tp->thread_fsm ()->finished_p ()) | |
243a9253 PA |
8500 | { |
8501 | struct return_value_info *rv; | |
8502 | ||
573269a8 LS |
8503 | rv = tp->thread_fsm ()->return_value (); |
8504 | if (rv != nullptr) | |
243a9253 PA |
8505 | print_return_value (uiout, rv); |
8506 | } | |
0c7e1a46 PA |
8507 | } |
8508 | ||
388a7084 PA |
8509 | /* See infrun.h. */ |
8510 | ||
8511 | void | |
8512 | maybe_remove_breakpoints (void) | |
8513 | { | |
55f6301a | 8514 | if (!breakpoints_should_be_inserted_now () && target_has_execution ()) |
388a7084 PA |
8515 | { |
8516 | if (remove_breakpoints ()) | |
8517 | { | |
223ffa71 | 8518 | target_terminal::ours_for_output (); |
6cb06a8c TT |
8519 | gdb_printf (_("Cannot remove breakpoints because " |
8520 | "program is no longer writable.\nFurther " | |
8521 | "execution is probably impossible.\n")); | |
388a7084 PA |
8522 | } |
8523 | } | |
8524 | } | |
8525 | ||
4c2f2a79 PA |
8526 | /* The execution context that just caused a normal stop. */ |
8527 | ||
8528 | struct stop_context | |
8529 | { | |
2d844eaf | 8530 | stop_context (); |
2d844eaf TT |
8531 | |
8532 | DISABLE_COPY_AND_ASSIGN (stop_context); | |
8533 | ||
8534 | bool changed () const; | |
8535 | ||
4c2f2a79 PA |
8536 | /* The stop ID. */ |
8537 | ULONGEST stop_id; | |
c906108c | 8538 | |
4c2f2a79 | 8539 | /* The event PTID. */ |
c906108c | 8540 | |
4c2f2a79 PA |
8541 | ptid_t ptid; |
8542 | ||
8543 | /* If stopp for a thread event, this is the thread that caused the | |
8544 | stop. */ | |
d634cd0b | 8545 | thread_info_ref thread; |
4c2f2a79 PA |
8546 | |
8547 | /* The inferior that caused the stop. */ | |
8548 | int inf_num; | |
8549 | }; | |
8550 | ||
2d844eaf | 8551 | /* Initializes a new stop context. If stopped for a thread event, this |
4c2f2a79 PA |
8552 | takes a strong reference to the thread. */ |
8553 | ||
2d844eaf | 8554 | stop_context::stop_context () |
4c2f2a79 | 8555 | { |
2d844eaf TT |
8556 | stop_id = get_stop_id (); |
8557 | ptid = inferior_ptid; | |
8558 | inf_num = current_inferior ()->num; | |
4c2f2a79 | 8559 | |
d7e15655 | 8560 | if (inferior_ptid != null_ptid) |
4c2f2a79 PA |
8561 | { |
8562 | /* Take a strong reference so that the thread can't be deleted | |
8563 | yet. */ | |
d634cd0b | 8564 | thread = thread_info_ref::new_reference (inferior_thread ()); |
4c2f2a79 | 8565 | } |
4c2f2a79 PA |
8566 | } |
8567 | ||
8568 | /* Return true if the current context no longer matches the saved stop | |
8569 | context. */ | |
8570 | ||
2d844eaf TT |
8571 | bool |
8572 | stop_context::changed () const | |
8573 | { | |
8574 | if (ptid != inferior_ptid) | |
8575 | return true; | |
8576 | if (inf_num != current_inferior ()->num) | |
8577 | return true; | |
03acd4d8 | 8578 | if (thread != nullptr && thread->state != THREAD_STOPPED) |
2d844eaf TT |
8579 | return true; |
8580 | if (get_stop_id () != stop_id) | |
8581 | return true; | |
8582 | return false; | |
4c2f2a79 PA |
8583 | } |
8584 | ||
8585 | /* See infrun.h. */ | |
8586 | ||
8dd08de7 AB |
8587 | bool |
8588 | normal_stop () | |
c906108c | 8589 | { |
73b65bb0 | 8590 | struct target_waitstatus last; |
73b65bb0 | 8591 | |
5b6d1e4f | 8592 | get_last_target_status (nullptr, nullptr, &last); |
73b65bb0 | 8593 | |
4c2f2a79 PA |
8594 | new_stop_id (); |
8595 | ||
29f49a6a PA |
8596 | /* If an exception is thrown from this point on, make sure to |
8597 | propagate GDB's knowledge of the executing state to the | |
8598 | frontend/user running state. A QUIT is an easy exception to see | |
8599 | here, so do this before any filtered output. */ | |
731f534f | 8600 | |
5b6d1e4f | 8601 | ptid_t finish_ptid = null_ptid; |
731f534f | 8602 | |
c35b1492 | 8603 | if (!non_stop) |
5b6d1e4f | 8604 | finish_ptid = minus_one_ptid; |
183be222 SM |
8605 | else if (last.kind () == TARGET_WAITKIND_SIGNALLED |
8606 | || last.kind () == TARGET_WAITKIND_EXITED) | |
e1316e60 PA |
8607 | { |
8608 | /* On some targets, we may still have live threads in the | |
8609 | inferior when we get a process exit event. E.g., for | |
8610 | "checkpoint", when the current checkpoint/fork exits, | |
8611 | linux-fork.c automatically switches to another fork from | |
8612 | within target_mourn_inferior. */ | |
731f534f | 8613 | if (inferior_ptid != null_ptid) |
5b6d1e4f | 8614 | finish_ptid = ptid_t (inferior_ptid.pid ()); |
e1316e60 | 8615 | } |
183be222 | 8616 | else if (last.kind () != TARGET_WAITKIND_NO_RESUMED) |
5b6d1e4f PA |
8617 | finish_ptid = inferior_ptid; |
8618 | ||
8619 | gdb::optional<scoped_finish_thread_state> maybe_finish_thread_state; | |
8620 | if (finish_ptid != null_ptid) | |
8621 | { | |
8622 | maybe_finish_thread_state.emplace | |
8623 | (user_visible_resume_target (finish_ptid), finish_ptid); | |
8624 | } | |
29f49a6a | 8625 | |
b57bacec PA |
8626 | /* As we're presenting a stop, and potentially removing breakpoints, |
8627 | update the thread list so we can tell whether there are threads | |
8628 | running on the target. With target remote, for example, we can | |
8629 | only learn about new threads when we explicitly update the thread | |
8630 | list. Do this before notifying the interpreters about signal | |
8631 | stops, end of stepping ranges, etc., so that the "new thread" | |
8632 | output is emitted before e.g., "Program received signal FOO", | |
8633 | instead of after. */ | |
8634 | update_thread_list (); | |
8635 | ||
183be222 | 8636 | if (last.kind () == TARGET_WAITKIND_STOPPED && stopped_by_random_signal) |
1edb66d8 | 8637 | gdb::observers::signal_received.notify (inferior_thread ()->stop_signal ()); |
b57bacec | 8638 | |
c906108c SS |
8639 | /* As with the notification of thread events, we want to delay |
8640 | notifying the user that we've switched thread context until | |
8641 | the inferior actually stops. | |
8642 | ||
73b65bb0 DJ |
8643 | There's no point in saying anything if the inferior has exited. |
8644 | Note that SIGNALLED here means "exited with a signal", not | |
b65dc60b PA |
8645 | "received a signal". |
8646 | ||
8647 | Also skip saying anything in non-stop mode. In that mode, as we | |
8648 | don't want GDB to switch threads behind the user's back, to avoid | |
8649 | races where the user is typing a command to apply to thread x, | |
8650 | but GDB switches to thread y before the user finishes entering | |
8651 | the command, fetch_inferior_event installs a cleanup to restore | |
8652 | the current thread back to the thread the user had selected right | |
8653 | after this event is handled, so we're not really switching, only | |
8654 | informing of a stop. */ | |
4f8d22e3 | 8655 | if (!non_stop |
731f534f | 8656 | && previous_inferior_ptid != inferior_ptid |
55f6301a | 8657 | && target_has_execution () |
183be222 SM |
8658 | && last.kind () != TARGET_WAITKIND_SIGNALLED |
8659 | && last.kind () != TARGET_WAITKIND_EXITED | |
8660 | && last.kind () != TARGET_WAITKIND_NO_RESUMED) | |
c906108c | 8661 | { |
0e454242 | 8662 | SWITCH_THRU_ALL_UIS () |
3b12939d | 8663 | { |
223ffa71 | 8664 | target_terminal::ours_for_output (); |
6cb06a8c TT |
8665 | gdb_printf (_("[Switching to %s]\n"), |
8666 | target_pid_to_str (inferior_ptid).c_str ()); | |
3b12939d PA |
8667 | annotate_thread_changed (); |
8668 | } | |
39f77062 | 8669 | previous_inferior_ptid = inferior_ptid; |
c906108c | 8670 | } |
c906108c | 8671 | |
183be222 | 8672 | if (last.kind () == TARGET_WAITKIND_NO_RESUMED) |
0e5bf2a8 | 8673 | { |
0e454242 | 8674 | SWITCH_THRU_ALL_UIS () |
3b12939d PA |
8675 | if (current_ui->prompt_state == PROMPT_BLOCKED) |
8676 | { | |
223ffa71 | 8677 | target_terminal::ours_for_output (); |
6cb06a8c | 8678 | gdb_printf (_("No unwaited-for children left.\n")); |
3b12939d | 8679 | } |
0e5bf2a8 PA |
8680 | } |
8681 | ||
b57bacec | 8682 | /* Note: this depends on the update_thread_list call above. */ |
388a7084 | 8683 | maybe_remove_breakpoints (); |
c906108c | 8684 | |
c906108c SS |
8685 | /* If an auto-display called a function and that got a signal, |
8686 | delete that auto-display to avoid an infinite recursion. */ | |
8687 | ||
8688 | if (stopped_by_random_signal) | |
8689 | disable_current_display (); | |
8690 | ||
0e454242 | 8691 | SWITCH_THRU_ALL_UIS () |
3b12939d PA |
8692 | { |
8693 | async_enable_stdin (); | |
8694 | } | |
c906108c | 8695 | |
388a7084 | 8696 | /* Let the user/frontend see the threads as stopped. */ |
731f534f | 8697 | maybe_finish_thread_state.reset (); |
388a7084 PA |
8698 | |
8699 | /* Select innermost stack frame - i.e., current frame is frame 0, | |
8700 | and current location is based on that. Handle the case where the | |
8701 | dummy call is returning after being stopped. E.g. the dummy call | |
8702 | previously hit a breakpoint. (If the dummy call returns | |
8703 | normally, we won't reach here.) Do this before the stop hook is | |
8704 | run, so that it doesn't get to see the temporary dummy frame, | |
8705 | which is not where we'll present the stop. */ | |
8706 | if (has_stack_frames ()) | |
8707 | { | |
8708 | if (stop_stack_dummy == STOP_STACK_DUMMY) | |
8709 | { | |
8710 | /* Pop the empty frame that contains the stack dummy. This | |
8711 | also restores inferior state prior to the call (struct | |
8712 | infcall_suspend_state). */ | |
bd2b40ac | 8713 | frame_info_ptr frame = get_current_frame (); |
388a7084 PA |
8714 | |
8715 | gdb_assert (get_frame_type (frame) == DUMMY_FRAME); | |
8716 | frame_pop (frame); | |
8717 | /* frame_pop calls reinit_frame_cache as the last thing it | |
8718 | does which means there's now no selected frame. */ | |
8719 | } | |
8720 | ||
8721 | select_frame (get_current_frame ()); | |
8722 | ||
8723 | /* Set the current source location. */ | |
8724 | set_current_sal_from_frame (get_current_frame ()); | |
8725 | } | |
dd7e2d2b PA |
8726 | |
8727 | /* Look up the hook_stop and run it (CLI internally handles problem | |
8728 | of stop_command's pre-hook not existing). */ | |
49a82d50 | 8729 | stop_context saved_context; |
4c2f2a79 | 8730 | |
49a82d50 TT |
8731 | try |
8732 | { | |
8733 | execute_cmd_pre_hook (stop_command); | |
4c2f2a79 | 8734 | } |
49a82d50 TT |
8735 | catch (const gdb_exception &ex) |
8736 | { | |
8737 | exception_fprintf (gdb_stderr, ex, | |
8738 | "Error while running hook_stop:\n"); | |
8739 | } | |
8740 | ||
8741 | /* If the stop hook resumes the target, then there's no point in | |
8742 | trying to notify about the previous stop; its context is | |
8743 | gone. Likewise if the command switches thread or inferior -- | |
8744 | the observers would print a stop for the wrong | |
8745 | thread/inferior. */ | |
8746 | if (saved_context.changed ()) | |
8dd08de7 | 8747 | return true; |
dd7e2d2b | 8748 | |
388a7084 PA |
8749 | /* Notify observers about the stop. This is where the interpreters |
8750 | print the stop event. */ | |
d7e15655 | 8751 | if (inferior_ptid != null_ptid) |
76727919 | 8752 | gdb::observers::normal_stop.notify (inferior_thread ()->control.stop_bpstat, |
24a7f1b5 | 8753 | stop_print_frame); |
388a7084 | 8754 | else |
03acd4d8 | 8755 | gdb::observers::normal_stop.notify (nullptr, stop_print_frame); |
347bddb7 | 8756 | |
243a9253 PA |
8757 | annotate_stopped (); |
8758 | ||
55f6301a | 8759 | if (target_has_execution ()) |
48844aa6 | 8760 | { |
183be222 SM |
8761 | if (last.kind () != TARGET_WAITKIND_SIGNALLED |
8762 | && last.kind () != TARGET_WAITKIND_EXITED | |
8763 | && last.kind () != TARGET_WAITKIND_NO_RESUMED) | |
48844aa6 PA |
8764 | /* Delete the breakpoint we stopped at, if it wants to be deleted. |
8765 | Delete any breakpoint that is to be deleted at the next stop. */ | |
16c381f0 | 8766 | breakpoint_auto_delete (inferior_thread ()->control.stop_bpstat); |
94cc34af | 8767 | } |
6c95b8df | 8768 | |
8dd08de7 | 8769 | return false; |
c906108c | 8770 | } |
c906108c | 8771 | \f |
c5aa993b | 8772 | int |
96baa820 | 8773 | signal_stop_state (int signo) |
c906108c | 8774 | { |
d6b48e9c | 8775 | return signal_stop[signo]; |
c906108c SS |
8776 | } |
8777 | ||
c5aa993b | 8778 | int |
96baa820 | 8779 | signal_print_state (int signo) |
c906108c SS |
8780 | { |
8781 | return signal_print[signo]; | |
8782 | } | |
8783 | ||
c5aa993b | 8784 | int |
96baa820 | 8785 | signal_pass_state (int signo) |
c906108c SS |
8786 | { |
8787 | return signal_program[signo]; | |
8788 | } | |
8789 | ||
2455069d UW |
8790 | static void |
8791 | signal_cache_update (int signo) | |
8792 | { | |
8793 | if (signo == -1) | |
8794 | { | |
a493e3e2 | 8795 | for (signo = 0; signo < (int) GDB_SIGNAL_LAST; signo++) |
2455069d UW |
8796 | signal_cache_update (signo); |
8797 | ||
8798 | return; | |
8799 | } | |
8800 | ||
8801 | signal_pass[signo] = (signal_stop[signo] == 0 | |
8802 | && signal_print[signo] == 0 | |
ab04a2af TT |
8803 | && signal_program[signo] == 1 |
8804 | && signal_catch[signo] == 0); | |
2455069d UW |
8805 | } |
8806 | ||
488f131b | 8807 | int |
7bda5e4a | 8808 | signal_stop_update (int signo, int state) |
d4f3574e SS |
8809 | { |
8810 | int ret = signal_stop[signo]; | |
abbb1732 | 8811 | |
d4f3574e | 8812 | signal_stop[signo] = state; |
2455069d | 8813 | signal_cache_update (signo); |
d4f3574e SS |
8814 | return ret; |
8815 | } | |
8816 | ||
488f131b | 8817 | int |
7bda5e4a | 8818 | signal_print_update (int signo, int state) |
d4f3574e SS |
8819 | { |
8820 | int ret = signal_print[signo]; | |
abbb1732 | 8821 | |
d4f3574e | 8822 | signal_print[signo] = state; |
2455069d | 8823 | signal_cache_update (signo); |
d4f3574e SS |
8824 | return ret; |
8825 | } | |
8826 | ||
488f131b | 8827 | int |
7bda5e4a | 8828 | signal_pass_update (int signo, int state) |
d4f3574e SS |
8829 | { |
8830 | int ret = signal_program[signo]; | |
abbb1732 | 8831 | |
d4f3574e | 8832 | signal_program[signo] = state; |
2455069d | 8833 | signal_cache_update (signo); |
d4f3574e SS |
8834 | return ret; |
8835 | } | |
8836 | ||
ab04a2af TT |
8837 | /* Update the global 'signal_catch' from INFO and notify the |
8838 | target. */ | |
8839 | ||
8840 | void | |
8841 | signal_catch_update (const unsigned int *info) | |
8842 | { | |
8843 | int i; | |
8844 | ||
8845 | for (i = 0; i < GDB_SIGNAL_LAST; ++i) | |
8846 | signal_catch[i] = info[i] > 0; | |
8847 | signal_cache_update (-1); | |
adc6a863 | 8848 | target_pass_signals (signal_pass); |
ab04a2af TT |
8849 | } |
8850 | ||
c906108c | 8851 | static void |
96baa820 | 8852 | sig_print_header (void) |
c906108c | 8853 | { |
6cb06a8c TT |
8854 | gdb_printf (_("Signal Stop\tPrint\tPass " |
8855 | "to program\tDescription\n")); | |
c906108c SS |
8856 | } |
8857 | ||
8858 | static void | |
2ea28649 | 8859 | sig_print_info (enum gdb_signal oursig) |
c906108c | 8860 | { |
2ea28649 | 8861 | const char *name = gdb_signal_to_name (oursig); |
c906108c | 8862 | int name_padding = 13 - strlen (name); |
96baa820 | 8863 | |
c906108c SS |
8864 | if (name_padding <= 0) |
8865 | name_padding = 0; | |
8866 | ||
6cb06a8c TT |
8867 | gdb_printf ("%s", name); |
8868 | gdb_printf ("%*.*s ", name_padding, name_padding, " "); | |
8869 | gdb_printf ("%s\t", signal_stop[oursig] ? "Yes" : "No"); | |
8870 | gdb_printf ("%s\t", signal_print[oursig] ? "Yes" : "No"); | |
8871 | gdb_printf ("%s\t\t", signal_program[oursig] ? "Yes" : "No"); | |
8872 | gdb_printf ("%s\n", gdb_signal_to_string (oursig)); | |
c906108c SS |
8873 | } |
8874 | ||
8875 | /* Specify how various signals in the inferior should be handled. */ | |
8876 | ||
8877 | static void | |
0b39b52e | 8878 | handle_command (const char *args, int from_tty) |
c906108c | 8879 | { |
c906108c | 8880 | int digits, wordlen; |
b926417a | 8881 | int sigfirst, siglast; |
2ea28649 | 8882 | enum gdb_signal oursig; |
c906108c | 8883 | int allsigs; |
c906108c | 8884 | |
03acd4d8 | 8885 | if (args == nullptr) |
c906108c | 8886 | { |
e2e0b3e5 | 8887 | error_no_arg (_("signal to handle")); |
c906108c SS |
8888 | } |
8889 | ||
1777feb0 | 8890 | /* Allocate and zero an array of flags for which signals to handle. */ |
c906108c | 8891 | |
adc6a863 PA |
8892 | const size_t nsigs = GDB_SIGNAL_LAST; |
8893 | unsigned char sigs[nsigs] {}; | |
c906108c | 8894 | |
1777feb0 | 8895 | /* Break the command line up into args. */ |
c906108c | 8896 | |
773a1edc | 8897 | gdb_argv built_argv (args); |
c906108c SS |
8898 | |
8899 | /* Walk through the args, looking for signal oursigs, signal names, and | |
8900 | actions. Signal numbers and signal names may be interspersed with | |
8901 | actions, with the actions being performed for all signals cumulatively | |
1777feb0 | 8902 | specified. Signal ranges can be specified as <LOW>-<HIGH>. */ |
c906108c | 8903 | |
773a1edc | 8904 | for (char *arg : built_argv) |
c906108c | 8905 | { |
773a1edc TT |
8906 | wordlen = strlen (arg); |
8907 | for (digits = 0; isdigit (arg[digits]); digits++) | |
c906108c SS |
8908 | {; |
8909 | } | |
8910 | allsigs = 0; | |
8911 | sigfirst = siglast = -1; | |
8912 | ||
773a1edc | 8913 | if (wordlen >= 1 && !strncmp (arg, "all", wordlen)) |
c906108c SS |
8914 | { |
8915 | /* Apply action to all signals except those used by the | |
1777feb0 | 8916 | debugger. Silently skip those. */ |
c906108c SS |
8917 | allsigs = 1; |
8918 | sigfirst = 0; | |
8919 | siglast = nsigs - 1; | |
8920 | } | |
773a1edc | 8921 | else if (wordlen >= 1 && !strncmp (arg, "stop", wordlen)) |
c906108c SS |
8922 | { |
8923 | SET_SIGS (nsigs, sigs, signal_stop); | |
8924 | SET_SIGS (nsigs, sigs, signal_print); | |
8925 | } | |
773a1edc | 8926 | else if (wordlen >= 1 && !strncmp (arg, "ignore", wordlen)) |
c906108c SS |
8927 | { |
8928 | UNSET_SIGS (nsigs, sigs, signal_program); | |
8929 | } | |
773a1edc | 8930 | else if (wordlen >= 2 && !strncmp (arg, "print", wordlen)) |
c906108c SS |
8931 | { |
8932 | SET_SIGS (nsigs, sigs, signal_print); | |
8933 | } | |
773a1edc | 8934 | else if (wordlen >= 2 && !strncmp (arg, "pass", wordlen)) |
c906108c SS |
8935 | { |
8936 | SET_SIGS (nsigs, sigs, signal_program); | |
8937 | } | |
773a1edc | 8938 | else if (wordlen >= 3 && !strncmp (arg, "nostop", wordlen)) |
c906108c SS |
8939 | { |
8940 | UNSET_SIGS (nsigs, sigs, signal_stop); | |
8941 | } | |
773a1edc | 8942 | else if (wordlen >= 3 && !strncmp (arg, "noignore", wordlen)) |
c906108c SS |
8943 | { |
8944 | SET_SIGS (nsigs, sigs, signal_program); | |
8945 | } | |
773a1edc | 8946 | else if (wordlen >= 4 && !strncmp (arg, "noprint", wordlen)) |
c906108c SS |
8947 | { |
8948 | UNSET_SIGS (nsigs, sigs, signal_print); | |
8949 | UNSET_SIGS (nsigs, sigs, signal_stop); | |
8950 | } | |
773a1edc | 8951 | else if (wordlen >= 4 && !strncmp (arg, "nopass", wordlen)) |
c906108c SS |
8952 | { |
8953 | UNSET_SIGS (nsigs, sigs, signal_program); | |
8954 | } | |
8955 | else if (digits > 0) | |
8956 | { | |
8957 | /* It is numeric. The numeric signal refers to our own | |
8958 | internal signal numbering from target.h, not to host/target | |
8959 | signal number. This is a feature; users really should be | |
8960 | using symbolic names anyway, and the common ones like | |
8961 | SIGHUP, SIGINT, SIGALRM, etc. will work right anyway. */ | |
8962 | ||
8963 | sigfirst = siglast = (int) | |
773a1edc TT |
8964 | gdb_signal_from_command (atoi (arg)); |
8965 | if (arg[digits] == '-') | |
c906108c SS |
8966 | { |
8967 | siglast = (int) | |
773a1edc | 8968 | gdb_signal_from_command (atoi (arg + digits + 1)); |
c906108c SS |
8969 | } |
8970 | if (sigfirst > siglast) | |
8971 | { | |
1777feb0 | 8972 | /* Bet he didn't figure we'd think of this case... */ |
b926417a | 8973 | std::swap (sigfirst, siglast); |
c906108c SS |
8974 | } |
8975 | } | |
8976 | else | |
8977 | { | |
773a1edc | 8978 | oursig = gdb_signal_from_name (arg); |
a493e3e2 | 8979 | if (oursig != GDB_SIGNAL_UNKNOWN) |
c906108c SS |
8980 | { |
8981 | sigfirst = siglast = (int) oursig; | |
8982 | } | |
8983 | else | |
8984 | { | |
8985 | /* Not a number and not a recognized flag word => complain. */ | |
773a1edc | 8986 | error (_("Unrecognized or ambiguous flag word: \"%s\"."), arg); |
c906108c SS |
8987 | } |
8988 | } | |
8989 | ||
8990 | /* If any signal numbers or symbol names were found, set flags for | |
dda83cd7 | 8991 | which signals to apply actions to. */ |
c906108c | 8992 | |
b926417a | 8993 | for (int signum = sigfirst; signum >= 0 && signum <= siglast; signum++) |
c906108c | 8994 | { |
2ea28649 | 8995 | switch ((enum gdb_signal) signum) |
c906108c | 8996 | { |
a493e3e2 PA |
8997 | case GDB_SIGNAL_TRAP: |
8998 | case GDB_SIGNAL_INT: | |
c906108c SS |
8999 | if (!allsigs && !sigs[signum]) |
9000 | { | |
9e2f0ad4 | 9001 | if (query (_("%s is used by the debugger.\n\ |
3e43a32a | 9002 | Are you sure you want to change it? "), |
2ea28649 | 9003 | gdb_signal_to_name ((enum gdb_signal) signum))) |
c906108c SS |
9004 | { |
9005 | sigs[signum] = 1; | |
9006 | } | |
9007 | else | |
6cb06a8c | 9008 | gdb_printf (_("Not confirmed, unchanged.\n")); |
c906108c SS |
9009 | } |
9010 | break; | |
a493e3e2 PA |
9011 | case GDB_SIGNAL_0: |
9012 | case GDB_SIGNAL_DEFAULT: | |
9013 | case GDB_SIGNAL_UNKNOWN: | |
c906108c SS |
9014 | /* Make sure that "all" doesn't print these. */ |
9015 | break; | |
9016 | default: | |
9017 | sigs[signum] = 1; | |
9018 | break; | |
9019 | } | |
9020 | } | |
c906108c SS |
9021 | } |
9022 | ||
b926417a | 9023 | for (int signum = 0; signum < nsigs; signum++) |
3a031f65 PA |
9024 | if (sigs[signum]) |
9025 | { | |
2455069d | 9026 | signal_cache_update (-1); |
adc6a863 PA |
9027 | target_pass_signals (signal_pass); |
9028 | target_program_signals (signal_program); | |
c906108c | 9029 | |
3a031f65 PA |
9030 | if (from_tty) |
9031 | { | |
9032 | /* Show the results. */ | |
9033 | sig_print_header (); | |
9034 | for (; signum < nsigs; signum++) | |
9035 | if (sigs[signum]) | |
aead7601 | 9036 | sig_print_info ((enum gdb_signal) signum); |
3a031f65 PA |
9037 | } |
9038 | ||
9039 | break; | |
9040 | } | |
c906108c SS |
9041 | } |
9042 | ||
de0bea00 MF |
9043 | /* Complete the "handle" command. */ |
9044 | ||
eb3ff9a5 | 9045 | static void |
de0bea00 | 9046 | handle_completer (struct cmd_list_element *ignore, |
eb3ff9a5 | 9047 | completion_tracker &tracker, |
6f937416 | 9048 | const char *text, const char *word) |
de0bea00 | 9049 | { |
de0bea00 MF |
9050 | static const char * const keywords[] = |
9051 | { | |
9052 | "all", | |
9053 | "stop", | |
9054 | "ignore", | |
9055 | "print", | |
9056 | "pass", | |
9057 | "nostop", | |
9058 | "noignore", | |
9059 | "noprint", | |
9060 | "nopass", | |
03acd4d8 | 9061 | nullptr, |
de0bea00 MF |
9062 | }; |
9063 | ||
eb3ff9a5 PA |
9064 | signal_completer (ignore, tracker, text, word); |
9065 | complete_on_enum (tracker, keywords, word, word); | |
de0bea00 MF |
9066 | } |
9067 | ||
2ea28649 PA |
9068 | enum gdb_signal |
9069 | gdb_signal_from_command (int num) | |
ed01b82c PA |
9070 | { |
9071 | if (num >= 1 && num <= 15) | |
2ea28649 | 9072 | return (enum gdb_signal) num; |
ed01b82c PA |
9073 | error (_("Only signals 1-15 are valid as numeric signals.\n\ |
9074 | Use \"info signals\" for a list of symbolic signals.")); | |
9075 | } | |
9076 | ||
c906108c SS |
9077 | /* Print current contents of the tables set by the handle command. |
9078 | It is possible we should just be printing signals actually used | |
9079 | by the current target (but for things to work right when switching | |
9080 | targets, all signals should be in the signal tables). */ | |
9081 | ||
9082 | static void | |
1d12d88f | 9083 | info_signals_command (const char *signum_exp, int from_tty) |
c906108c | 9084 | { |
2ea28649 | 9085 | enum gdb_signal oursig; |
abbb1732 | 9086 | |
c906108c SS |
9087 | sig_print_header (); |
9088 | ||
9089 | if (signum_exp) | |
9090 | { | |
9091 | /* First see if this is a symbol name. */ | |
2ea28649 | 9092 | oursig = gdb_signal_from_name (signum_exp); |
a493e3e2 | 9093 | if (oursig == GDB_SIGNAL_UNKNOWN) |
c906108c SS |
9094 | { |
9095 | /* No, try numeric. */ | |
9096 | oursig = | |
2ea28649 | 9097 | gdb_signal_from_command (parse_and_eval_long (signum_exp)); |
c906108c SS |
9098 | } |
9099 | sig_print_info (oursig); | |
9100 | return; | |
9101 | } | |
9102 | ||
6cb06a8c | 9103 | gdb_printf ("\n"); |
c906108c | 9104 | /* These ugly casts brought to you by the native VAX compiler. */ |
a493e3e2 PA |
9105 | for (oursig = GDB_SIGNAL_FIRST; |
9106 | (int) oursig < (int) GDB_SIGNAL_LAST; | |
2ea28649 | 9107 | oursig = (enum gdb_signal) ((int) oursig + 1)) |
c906108c SS |
9108 | { |
9109 | QUIT; | |
9110 | ||
a493e3e2 PA |
9111 | if (oursig != GDB_SIGNAL_UNKNOWN |
9112 | && oursig != GDB_SIGNAL_DEFAULT && oursig != GDB_SIGNAL_0) | |
c906108c SS |
9113 | sig_print_info (oursig); |
9114 | } | |
9115 | ||
6cb06a8c TT |
9116 | gdb_printf (_("\nUse the \"handle\" command " |
9117 | "to change these tables.\n")); | |
c906108c | 9118 | } |
4aa995e1 PA |
9119 | |
9120 | /* The $_siginfo convenience variable is a bit special. We don't know | |
9121 | for sure the type of the value until we actually have a chance to | |
7a9dd1b2 | 9122 | fetch the data. The type can change depending on gdbarch, so it is |
4aa995e1 PA |
9123 | also dependent on which thread you have selected. |
9124 | ||
9125 | 1. making $_siginfo be an internalvar that creates a new value on | |
9126 | access. | |
9127 | ||
9128 | 2. making the value of $_siginfo be an lval_computed value. */ | |
9129 | ||
9130 | /* This function implements the lval_computed support for reading a | |
9131 | $_siginfo value. */ | |
9132 | ||
9133 | static void | |
9134 | siginfo_value_read (struct value *v) | |
9135 | { | |
9136 | LONGEST transferred; | |
9137 | ||
a911d87a PA |
9138 | /* If we can access registers, so can we access $_siginfo. Likewise |
9139 | vice versa. */ | |
9140 | validate_registers_access (); | |
c709acd1 | 9141 | |
4aa995e1 | 9142 | transferred = |
328d42d8 SM |
9143 | target_read (current_inferior ()->top_target (), |
9144 | TARGET_OBJECT_SIGNAL_INFO, | |
03acd4d8 | 9145 | nullptr, |
50888e42 | 9146 | value_contents_all_raw (v).data (), |
4aa995e1 | 9147 | value_offset (v), |
df86565b | 9148 | value_type (v)->length ()); |
4aa995e1 | 9149 | |
df86565b | 9150 | if (transferred != value_type (v)->length ()) |
4aa995e1 PA |
9151 | error (_("Unable to read siginfo")); |
9152 | } | |
9153 | ||
9154 | /* This function implements the lval_computed support for writing a | |
9155 | $_siginfo value. */ | |
9156 | ||
9157 | static void | |
9158 | siginfo_value_write (struct value *v, struct value *fromval) | |
9159 | { | |
9160 | LONGEST transferred; | |
9161 | ||
a911d87a PA |
9162 | /* If we can access registers, so can we access $_siginfo. Likewise |
9163 | vice versa. */ | |
9164 | validate_registers_access (); | |
c709acd1 | 9165 | |
328d42d8 | 9166 | transferred = target_write (current_inferior ()->top_target (), |
4aa995e1 | 9167 | TARGET_OBJECT_SIGNAL_INFO, |
03acd4d8 | 9168 | nullptr, |
50888e42 | 9169 | value_contents_all_raw (fromval).data (), |
4aa995e1 | 9170 | value_offset (v), |
df86565b | 9171 | value_type (fromval)->length ()); |
4aa995e1 | 9172 | |
df86565b | 9173 | if (transferred != value_type (fromval)->length ()) |
4aa995e1 PA |
9174 | error (_("Unable to write siginfo")); |
9175 | } | |
9176 | ||
c8f2448a | 9177 | static const struct lval_funcs siginfo_value_funcs = |
4aa995e1 PA |
9178 | { |
9179 | siginfo_value_read, | |
9180 | siginfo_value_write | |
9181 | }; | |
9182 | ||
9183 | /* Return a new value with the correct type for the siginfo object of | |
78267919 UW |
9184 | the current thread using architecture GDBARCH. Return a void value |
9185 | if there's no object available. */ | |
4aa995e1 | 9186 | |
2c0b251b | 9187 | static struct value * |
22d2b532 SDJ |
9188 | siginfo_make_value (struct gdbarch *gdbarch, struct internalvar *var, |
9189 | void *ignore) | |
4aa995e1 | 9190 | { |
841de120 | 9191 | if (target_has_stack () |
d7e15655 | 9192 | && inferior_ptid != null_ptid |
78267919 | 9193 | && gdbarch_get_siginfo_type_p (gdbarch)) |
4aa995e1 | 9194 | { |
78267919 | 9195 | struct type *type = gdbarch_get_siginfo_type (gdbarch); |
abbb1732 | 9196 | |
03acd4d8 | 9197 | return allocate_computed_value (type, &siginfo_value_funcs, nullptr); |
4aa995e1 PA |
9198 | } |
9199 | ||
78267919 | 9200 | return allocate_value (builtin_type (gdbarch)->builtin_void); |
4aa995e1 PA |
9201 | } |
9202 | ||
c906108c | 9203 | \f |
16c381f0 JK |
9204 | /* infcall_suspend_state contains state about the program itself like its |
9205 | registers and any signal it received when it last stopped. | |
9206 | This state must be restored regardless of how the inferior function call | |
9207 | ends (either successfully, or after it hits a breakpoint or signal) | |
9208 | if the program is to properly continue where it left off. */ | |
9209 | ||
6bf78e29 | 9210 | class infcall_suspend_state |
7a292a7a | 9211 | { |
6bf78e29 AB |
9212 | public: |
9213 | /* Capture state from GDBARCH, TP, and REGCACHE that must be restored | |
9214 | once the inferior function call has finished. */ | |
9215 | infcall_suspend_state (struct gdbarch *gdbarch, | |
dda83cd7 SM |
9216 | const struct thread_info *tp, |
9217 | struct regcache *regcache) | |
1edb66d8 | 9218 | : m_registers (new readonly_detached_regcache (*regcache)) |
6bf78e29 | 9219 | { |
1edb66d8 SM |
9220 | tp->save_suspend_to (m_thread_suspend); |
9221 | ||
6bf78e29 AB |
9222 | gdb::unique_xmalloc_ptr<gdb_byte> siginfo_data; |
9223 | ||
9224 | if (gdbarch_get_siginfo_type_p (gdbarch)) | |
9225 | { | |
dda83cd7 | 9226 | struct type *type = gdbarch_get_siginfo_type (gdbarch); |
df86565b | 9227 | size_t len = type->length (); |
6bf78e29 | 9228 | |
dda83cd7 | 9229 | siginfo_data.reset ((gdb_byte *) xmalloc (len)); |
6bf78e29 | 9230 | |
328d42d8 | 9231 | if (target_read (current_inferior ()->top_target (), |
03acd4d8 | 9232 | TARGET_OBJECT_SIGNAL_INFO, nullptr, |
dda83cd7 SM |
9233 | siginfo_data.get (), 0, len) != len) |
9234 | { | |
9235 | /* Errors ignored. */ | |
9236 | siginfo_data.reset (nullptr); | |
9237 | } | |
6bf78e29 AB |
9238 | } |
9239 | ||
9240 | if (siginfo_data) | |
9241 | { | |
dda83cd7 SM |
9242 | m_siginfo_gdbarch = gdbarch; |
9243 | m_siginfo_data = std::move (siginfo_data); | |
6bf78e29 AB |
9244 | } |
9245 | } | |
9246 | ||
9247 | /* Return a pointer to the stored register state. */ | |
16c381f0 | 9248 | |
6bf78e29 AB |
9249 | readonly_detached_regcache *registers () const |
9250 | { | |
9251 | return m_registers.get (); | |
9252 | } | |
9253 | ||
9254 | /* Restores the stored state into GDBARCH, TP, and REGCACHE. */ | |
9255 | ||
9256 | void restore (struct gdbarch *gdbarch, | |
dda83cd7 SM |
9257 | struct thread_info *tp, |
9258 | struct regcache *regcache) const | |
6bf78e29 | 9259 | { |
1edb66d8 | 9260 | tp->restore_suspend_from (m_thread_suspend); |
6bf78e29 AB |
9261 | |
9262 | if (m_siginfo_gdbarch == gdbarch) | |
9263 | { | |
dda83cd7 | 9264 | struct type *type = gdbarch_get_siginfo_type (gdbarch); |
6bf78e29 | 9265 | |
dda83cd7 | 9266 | /* Errors ignored. */ |
328d42d8 | 9267 | target_write (current_inferior ()->top_target (), |
03acd4d8 | 9268 | TARGET_OBJECT_SIGNAL_INFO, nullptr, |
df86565b | 9269 | m_siginfo_data.get (), 0, type->length ()); |
6bf78e29 AB |
9270 | } |
9271 | ||
9272 | /* The inferior can be gone if the user types "print exit(0)" | |
9273 | (and perhaps other times). */ | |
55f6301a | 9274 | if (target_has_execution ()) |
6bf78e29 AB |
9275 | /* NB: The register write goes through to the target. */ |
9276 | regcache->restore (registers ()); | |
9277 | } | |
9278 | ||
9279 | private: | |
9280 | /* How the current thread stopped before the inferior function call was | |
9281 | executed. */ | |
9282 | struct thread_suspend_state m_thread_suspend; | |
9283 | ||
9284 | /* The registers before the inferior function call was executed. */ | |
9285 | std::unique_ptr<readonly_detached_regcache> m_registers; | |
1736ad11 | 9286 | |
35515841 | 9287 | /* Format of SIGINFO_DATA or NULL if it is not present. */ |
6bf78e29 | 9288 | struct gdbarch *m_siginfo_gdbarch = nullptr; |
1736ad11 JK |
9289 | |
9290 | /* The inferior format depends on SIGINFO_GDBARCH and it has a length of | |
df86565b | 9291 | gdbarch_get_siginfo_type ()->length (). For different gdbarch the |
1736ad11 | 9292 | content would be invalid. */ |
6bf78e29 | 9293 | gdb::unique_xmalloc_ptr<gdb_byte> m_siginfo_data; |
b89667eb DE |
9294 | }; |
9295 | ||
cb524840 TT |
9296 | infcall_suspend_state_up |
9297 | save_infcall_suspend_state () | |
b89667eb | 9298 | { |
b89667eb | 9299 | struct thread_info *tp = inferior_thread (); |
1736ad11 | 9300 | struct regcache *regcache = get_current_regcache (); |
ac7936df | 9301 | struct gdbarch *gdbarch = regcache->arch (); |
1736ad11 | 9302 | |
6bf78e29 AB |
9303 | infcall_suspend_state_up inf_state |
9304 | (new struct infcall_suspend_state (gdbarch, tp, regcache)); | |
1736ad11 | 9305 | |
6bf78e29 AB |
9306 | /* Having saved the current state, adjust the thread state, discarding |
9307 | any stop signal information. The stop signal is not useful when | |
9308 | starting an inferior function call, and run_inferior_call will not use | |
9309 | the signal due to its `proceed' call with GDB_SIGNAL_0. */ | |
1edb66d8 | 9310 | tp->set_stop_signal (GDB_SIGNAL_0); |
35515841 | 9311 | |
b89667eb DE |
9312 | return inf_state; |
9313 | } | |
9314 | ||
9315 | /* Restore inferior session state to INF_STATE. */ | |
9316 | ||
9317 | void | |
16c381f0 | 9318 | restore_infcall_suspend_state (struct infcall_suspend_state *inf_state) |
b89667eb DE |
9319 | { |
9320 | struct thread_info *tp = inferior_thread (); | |
1736ad11 | 9321 | struct regcache *regcache = get_current_regcache (); |
ac7936df | 9322 | struct gdbarch *gdbarch = regcache->arch (); |
b89667eb | 9323 | |
6bf78e29 | 9324 | inf_state->restore (gdbarch, tp, regcache); |
16c381f0 | 9325 | discard_infcall_suspend_state (inf_state); |
b89667eb DE |
9326 | } |
9327 | ||
b89667eb | 9328 | void |
16c381f0 | 9329 | discard_infcall_suspend_state (struct infcall_suspend_state *inf_state) |
b89667eb | 9330 | { |
dd848631 | 9331 | delete inf_state; |
b89667eb DE |
9332 | } |
9333 | ||
daf6667d | 9334 | readonly_detached_regcache * |
16c381f0 | 9335 | get_infcall_suspend_state_regcache (struct infcall_suspend_state *inf_state) |
b89667eb | 9336 | { |
6bf78e29 | 9337 | return inf_state->registers (); |
b89667eb DE |
9338 | } |
9339 | ||
16c381f0 JK |
9340 | /* infcall_control_state contains state regarding gdb's control of the |
9341 | inferior itself like stepping control. It also contains session state like | |
9342 | the user's currently selected frame. */ | |
b89667eb | 9343 | |
16c381f0 | 9344 | struct infcall_control_state |
b89667eb | 9345 | { |
16c381f0 JK |
9346 | struct thread_control_state thread_control; |
9347 | struct inferior_control_state inferior_control; | |
d82142e2 JK |
9348 | |
9349 | /* Other fields: */ | |
ee841dd8 TT |
9350 | enum stop_stack_kind stop_stack_dummy = STOP_NONE; |
9351 | int stopped_by_random_signal = 0; | |
7a292a7a | 9352 | |
79952e69 PA |
9353 | /* ID and level of the selected frame when the inferior function |
9354 | call was made. */ | |
ee841dd8 | 9355 | struct frame_id selected_frame_id {}; |
79952e69 | 9356 | int selected_frame_level = -1; |
7a292a7a SS |
9357 | }; |
9358 | ||
c906108c | 9359 | /* Save all of the information associated with the inferior<==>gdb |
b89667eb | 9360 | connection. */ |
c906108c | 9361 | |
cb524840 TT |
9362 | infcall_control_state_up |
9363 | save_infcall_control_state () | |
c906108c | 9364 | { |
cb524840 | 9365 | infcall_control_state_up inf_status (new struct infcall_control_state); |
4e1c45ea | 9366 | struct thread_info *tp = inferior_thread (); |
d6b48e9c | 9367 | struct inferior *inf = current_inferior (); |
7a292a7a | 9368 | |
16c381f0 JK |
9369 | inf_status->thread_control = tp->control; |
9370 | inf_status->inferior_control = inf->control; | |
d82142e2 | 9371 | |
03acd4d8 CL |
9372 | tp->control.step_resume_breakpoint = nullptr; |
9373 | tp->control.exception_resume_breakpoint = nullptr; | |
8358c15c | 9374 | |
16c381f0 JK |
9375 | /* Save original bpstat chain to INF_STATUS; replace it in TP with copy of |
9376 | chain. If caller's caller is walking the chain, they'll be happier if we | |
9377 | hand them back the original chain when restore_infcall_control_state is | |
9378 | called. */ | |
9379 | tp->control.stop_bpstat = bpstat_copy (tp->control.stop_bpstat); | |
d82142e2 JK |
9380 | |
9381 | /* Other fields: */ | |
9382 | inf_status->stop_stack_dummy = stop_stack_dummy; | |
9383 | inf_status->stopped_by_random_signal = stopped_by_random_signal; | |
c5aa993b | 9384 | |
79952e69 PA |
9385 | save_selected_frame (&inf_status->selected_frame_id, |
9386 | &inf_status->selected_frame_level); | |
b89667eb | 9387 | |
7a292a7a | 9388 | return inf_status; |
c906108c SS |
9389 | } |
9390 | ||
b89667eb DE |
9391 | /* Restore inferior session state to INF_STATUS. */ |
9392 | ||
c906108c | 9393 | void |
16c381f0 | 9394 | restore_infcall_control_state (struct infcall_control_state *inf_status) |
c906108c | 9395 | { |
4e1c45ea | 9396 | struct thread_info *tp = inferior_thread (); |
d6b48e9c | 9397 | struct inferior *inf = current_inferior (); |
4e1c45ea | 9398 | |
8358c15c JK |
9399 | if (tp->control.step_resume_breakpoint) |
9400 | tp->control.step_resume_breakpoint->disposition = disp_del_at_next_stop; | |
9401 | ||
5b79abe7 TT |
9402 | if (tp->control.exception_resume_breakpoint) |
9403 | tp->control.exception_resume_breakpoint->disposition | |
9404 | = disp_del_at_next_stop; | |
9405 | ||
d82142e2 | 9406 | /* Handle the bpstat_copy of the chain. */ |
16c381f0 | 9407 | bpstat_clear (&tp->control.stop_bpstat); |
d82142e2 | 9408 | |
16c381f0 JK |
9409 | tp->control = inf_status->thread_control; |
9410 | inf->control = inf_status->inferior_control; | |
d82142e2 JK |
9411 | |
9412 | /* Other fields: */ | |
9413 | stop_stack_dummy = inf_status->stop_stack_dummy; | |
9414 | stopped_by_random_signal = inf_status->stopped_by_random_signal; | |
c906108c | 9415 | |
841de120 | 9416 | if (target_has_stack ()) |
c906108c | 9417 | { |
79952e69 PA |
9418 | restore_selected_frame (inf_status->selected_frame_id, |
9419 | inf_status->selected_frame_level); | |
c906108c | 9420 | } |
c906108c | 9421 | |
ee841dd8 | 9422 | delete inf_status; |
7a292a7a | 9423 | } |
c906108c SS |
9424 | |
9425 | void | |
16c381f0 | 9426 | discard_infcall_control_state (struct infcall_control_state *inf_status) |
7a292a7a | 9427 | { |
8358c15c JK |
9428 | if (inf_status->thread_control.step_resume_breakpoint) |
9429 | inf_status->thread_control.step_resume_breakpoint->disposition | |
9430 | = disp_del_at_next_stop; | |
9431 | ||
5b79abe7 TT |
9432 | if (inf_status->thread_control.exception_resume_breakpoint) |
9433 | inf_status->thread_control.exception_resume_breakpoint->disposition | |
9434 | = disp_del_at_next_stop; | |
9435 | ||
1777feb0 | 9436 | /* See save_infcall_control_state for info on stop_bpstat. */ |
16c381f0 | 9437 | bpstat_clear (&inf_status->thread_control.stop_bpstat); |
8358c15c | 9438 | |
ee841dd8 | 9439 | delete inf_status; |
7a292a7a | 9440 | } |
b89667eb | 9441 | \f |
7f89fd65 | 9442 | /* See infrun.h. */ |
0c557179 SDJ |
9443 | |
9444 | void | |
9445 | clear_exit_convenience_vars (void) | |
9446 | { | |
9447 | clear_internalvar (lookup_internalvar ("_exitsignal")); | |
9448 | clear_internalvar (lookup_internalvar ("_exitcode")); | |
9449 | } | |
c5aa993b | 9450 | \f |
488f131b | 9451 | |
b2175913 MS |
9452 | /* User interface for reverse debugging: |
9453 | Set exec-direction / show exec-direction commands | |
9454 | (returns error unless target implements to_set_exec_direction method). */ | |
9455 | ||
170742de | 9456 | enum exec_direction_kind execution_direction = EXEC_FORWARD; |
b2175913 MS |
9457 | static const char exec_forward[] = "forward"; |
9458 | static const char exec_reverse[] = "reverse"; | |
9459 | static const char *exec_direction = exec_forward; | |
40478521 | 9460 | static const char *const exec_direction_names[] = { |
b2175913 MS |
9461 | exec_forward, |
9462 | exec_reverse, | |
03acd4d8 | 9463 | nullptr |
b2175913 MS |
9464 | }; |
9465 | ||
9466 | static void | |
eb4c3f4a | 9467 | set_exec_direction_func (const char *args, int from_tty, |
b2175913 MS |
9468 | struct cmd_list_element *cmd) |
9469 | { | |
05374cfd | 9470 | if (target_can_execute_reverse ()) |
b2175913 MS |
9471 | { |
9472 | if (!strcmp (exec_direction, exec_forward)) | |
9473 | execution_direction = EXEC_FORWARD; | |
9474 | else if (!strcmp (exec_direction, exec_reverse)) | |
9475 | execution_direction = EXEC_REVERSE; | |
9476 | } | |
8bbed405 MS |
9477 | else |
9478 | { | |
9479 | exec_direction = exec_forward; | |
9480 | error (_("Target does not support this operation.")); | |
9481 | } | |
b2175913 MS |
9482 | } |
9483 | ||
9484 | static void | |
9485 | show_exec_direction_func (struct ui_file *out, int from_tty, | |
9486 | struct cmd_list_element *cmd, const char *value) | |
9487 | { | |
9488 | switch (execution_direction) { | |
9489 | case EXEC_FORWARD: | |
6cb06a8c | 9490 | gdb_printf (out, _("Forward.\n")); |
b2175913 MS |
9491 | break; |
9492 | case EXEC_REVERSE: | |
6cb06a8c | 9493 | gdb_printf (out, _("Reverse.\n")); |
b2175913 | 9494 | break; |
b2175913 | 9495 | default: |
f34652de | 9496 | internal_error (_("bogus execution_direction value: %d"), |
d8b34453 | 9497 | (int) execution_direction); |
b2175913 MS |
9498 | } |
9499 | } | |
9500 | ||
d4db2f36 PA |
9501 | static void |
9502 | show_schedule_multiple (struct ui_file *file, int from_tty, | |
9503 | struct cmd_list_element *c, const char *value) | |
9504 | { | |
6cb06a8c TT |
9505 | gdb_printf (file, _("Resuming the execution of threads " |
9506 | "of all processes is %s.\n"), value); | |
d4db2f36 | 9507 | } |
ad52ddc6 | 9508 | |
22d2b532 SDJ |
9509 | /* Implementation of `siginfo' variable. */ |
9510 | ||
9511 | static const struct internalvar_funcs siginfo_funcs = | |
9512 | { | |
9513 | siginfo_make_value, | |
03acd4d8 | 9514 | nullptr, |
22d2b532 SDJ |
9515 | }; |
9516 | ||
372316f1 PA |
9517 | /* Callback for infrun's target events source. This is marked when a |
9518 | thread has a pending status to process. */ | |
9519 | ||
9520 | static void | |
9521 | infrun_async_inferior_event_handler (gdb_client_data data) | |
9522 | { | |
6b36ddeb | 9523 | clear_async_event_handler (infrun_async_inferior_event_token); |
b1a35af2 | 9524 | inferior_event_handler (INF_REG_EVENT); |
372316f1 PA |
9525 | } |
9526 | ||
8087c3fa | 9527 | #if GDB_SELF_TEST |
b161a60d SM |
9528 | namespace selftests |
9529 | { | |
9530 | ||
9531 | /* Verify that when two threads with the same ptid exist (from two different | |
9532 | targets) and one of them changes ptid, we only update inferior_ptid if | |
9533 | it is appropriate. */ | |
9534 | ||
9535 | static void | |
9536 | infrun_thread_ptid_changed () | |
9537 | { | |
9538 | gdbarch *arch = current_inferior ()->gdbarch; | |
9539 | ||
9540 | /* The thread which inferior_ptid represents changes ptid. */ | |
9541 | { | |
9542 | scoped_restore_current_pspace_and_thread restore; | |
9543 | ||
9544 | scoped_mock_context<test_target_ops> target1 (arch); | |
9545 | scoped_mock_context<test_target_ops> target2 (arch); | |
b161a60d SM |
9546 | |
9547 | ptid_t old_ptid (111, 222); | |
9548 | ptid_t new_ptid (111, 333); | |
9549 | ||
9550 | target1.mock_inferior.pid = old_ptid.pid (); | |
9551 | target1.mock_thread.ptid = old_ptid; | |
922cc93d SM |
9552 | target1.mock_inferior.ptid_thread_map.clear (); |
9553 | target1.mock_inferior.ptid_thread_map[old_ptid] = &target1.mock_thread; | |
9554 | ||
b161a60d SM |
9555 | target2.mock_inferior.pid = old_ptid.pid (); |
9556 | target2.mock_thread.ptid = old_ptid; | |
922cc93d SM |
9557 | target2.mock_inferior.ptid_thread_map.clear (); |
9558 | target2.mock_inferior.ptid_thread_map[old_ptid] = &target2.mock_thread; | |
b161a60d SM |
9559 | |
9560 | auto restore_inferior_ptid = make_scoped_restore (&inferior_ptid, old_ptid); | |
9561 | set_current_inferior (&target1.mock_inferior); | |
9562 | ||
9563 | thread_change_ptid (&target1.mock_target, old_ptid, new_ptid); | |
9564 | ||
9565 | gdb_assert (inferior_ptid == new_ptid); | |
9566 | } | |
9567 | ||
9568 | /* A thread with the same ptid as inferior_ptid, but from another target, | |
9569 | changes ptid. */ | |
9570 | { | |
9571 | scoped_restore_current_pspace_and_thread restore; | |
9572 | ||
9573 | scoped_mock_context<test_target_ops> target1 (arch); | |
9574 | scoped_mock_context<test_target_ops> target2 (arch); | |
b161a60d SM |
9575 | |
9576 | ptid_t old_ptid (111, 222); | |
9577 | ptid_t new_ptid (111, 333); | |
9578 | ||
9579 | target1.mock_inferior.pid = old_ptid.pid (); | |
9580 | target1.mock_thread.ptid = old_ptid; | |
922cc93d SM |
9581 | target1.mock_inferior.ptid_thread_map.clear (); |
9582 | target1.mock_inferior.ptid_thread_map[old_ptid] = &target1.mock_thread; | |
9583 | ||
b161a60d SM |
9584 | target2.mock_inferior.pid = old_ptid.pid (); |
9585 | target2.mock_thread.ptid = old_ptid; | |
922cc93d SM |
9586 | target2.mock_inferior.ptid_thread_map.clear (); |
9587 | target2.mock_inferior.ptid_thread_map[old_ptid] = &target2.mock_thread; | |
b161a60d SM |
9588 | |
9589 | auto restore_inferior_ptid = make_scoped_restore (&inferior_ptid, old_ptid); | |
9590 | set_current_inferior (&target2.mock_inferior); | |
9591 | ||
9592 | thread_change_ptid (&target1.mock_target, old_ptid, new_ptid); | |
9593 | ||
9594 | gdb_assert (inferior_ptid == old_ptid); | |
9595 | } | |
9596 | } | |
9597 | ||
9598 | } /* namespace selftests */ | |
9599 | ||
8087c3fa JB |
9600 | #endif /* GDB_SELF_TEST */ |
9601 | ||
6c265988 | 9602 | void _initialize_infrun (); |
c906108c | 9603 | void |
6c265988 | 9604 | _initialize_infrun () |
c906108c | 9605 | { |
de0bea00 | 9606 | struct cmd_list_element *c; |
c906108c | 9607 | |
372316f1 PA |
9608 | /* Register extra event sources in the event loop. */ |
9609 | infrun_async_inferior_event_token | |
03acd4d8 | 9610 | = create_async_event_handler (infrun_async_inferior_event_handler, nullptr, |
db20ebdf | 9611 | "infrun"); |
372316f1 | 9612 | |
e0f25bd9 SM |
9613 | cmd_list_element *info_signals_cmd |
9614 | = add_info ("signals", info_signals_command, _("\ | |
1bedd215 AC |
9615 | What debugger does when program gets various signals.\n\ |
9616 | Specify a signal as argument to print info on that signal only.")); | |
e0f25bd9 | 9617 | add_info_alias ("handle", info_signals_cmd, 0); |
c906108c | 9618 | |
de0bea00 | 9619 | c = add_com ("handle", class_run, handle_command, _("\ |
dfbd5e7b | 9620 | Specify how to handle signals.\n\ |
486c7739 | 9621 | Usage: handle SIGNAL [ACTIONS]\n\ |
c906108c | 9622 | Args are signals and actions to apply to those signals.\n\ |
dfbd5e7b | 9623 | If no actions are specified, the current settings for the specified signals\n\ |
486c7739 MF |
9624 | will be displayed instead.\n\ |
9625 | \n\ | |
c906108c SS |
9626 | Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\ |
9627 | from 1-15 are allowed for compatibility with old versions of GDB.\n\ | |
9628 | Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\ | |
9629 | The special arg \"all\" is recognized to mean all signals except those\n\ | |
1bedd215 | 9630 | used by the debugger, typically SIGTRAP and SIGINT.\n\ |
486c7739 | 9631 | \n\ |
1bedd215 | 9632 | Recognized actions include \"stop\", \"nostop\", \"print\", \"noprint\",\n\ |
c906108c SS |
9633 | \"pass\", \"nopass\", \"ignore\", or \"noignore\".\n\ |
9634 | Stop means reenter debugger if this signal happens (implies print).\n\ | |
9635 | Print means print a message if this signal happens.\n\ | |
9636 | Pass means let program see this signal; otherwise program doesn't know.\n\ | |
9637 | Ignore is a synonym for nopass and noignore is a synonym for pass.\n\ | |
dfbd5e7b PA |
9638 | Pass and Stop may be combined.\n\ |
9639 | \n\ | |
9640 | Multiple signals may be specified. Signal numbers and signal names\n\ | |
9641 | may be interspersed with actions, with the actions being performed for\n\ | |
9642 | all signals cumulatively specified.")); | |
de0bea00 | 9643 | set_cmd_completer (c, handle_completer); |
486c7739 | 9644 | |
49a82d50 TT |
9645 | stop_command = add_cmd ("stop", class_obscure, |
9646 | not_just_help_class_command, _("\ | |
1a966eab | 9647 | There is no `stop' command, but you can set a hook on `stop'.\n\ |
c906108c | 9648 | This allows you to set a list of commands to be run each time execution\n\ |
1a966eab | 9649 | of the program stops."), &cmdlist); |
c906108c | 9650 | |
94ba44a6 SM |
9651 | add_setshow_boolean_cmd |
9652 | ("infrun", class_maintenance, &debug_infrun, | |
9653 | _("Set inferior debugging."), | |
9654 | _("Show inferior debugging."), | |
9655 | _("When non-zero, inferior specific debugging is enabled."), | |
03acd4d8 | 9656 | nullptr, show_debug_infrun, &setdebuglist, &showdebuglist); |
527159b7 | 9657 | |
ad52ddc6 PA |
9658 | add_setshow_boolean_cmd ("non-stop", no_class, |
9659 | &non_stop_1, _("\ | |
9660 | Set whether gdb controls the inferior in non-stop mode."), _("\ | |
9661 | Show whether gdb controls the inferior in non-stop mode."), _("\ | |
9662 | When debugging a multi-threaded program and this setting is\n\ | |
9663 | off (the default, also called all-stop mode), when one thread stops\n\ | |
9664 | (for a breakpoint, watchpoint, exception, or similar events), GDB stops\n\ | |
9665 | all other threads in the program while you interact with the thread of\n\ | |
9666 | interest. When you continue or step a thread, you can allow the other\n\ | |
9667 | threads to run, or have them remain stopped, but while you inspect any\n\ | |
9668 | thread's state, all threads stop.\n\ | |
9669 | \n\ | |
9670 | In non-stop mode, when one thread stops, other threads can continue\n\ | |
9671 | to run freely. You'll be able to step each thread independently,\n\ | |
9672 | leave it stopped or free to run as needed."), | |
9673 | set_non_stop, | |
9674 | show_non_stop, | |
9675 | &setlist, | |
9676 | &showlist); | |
9677 | ||
adc6a863 | 9678 | for (size_t i = 0; i < GDB_SIGNAL_LAST; i++) |
c906108c SS |
9679 | { |
9680 | signal_stop[i] = 1; | |
9681 | signal_print[i] = 1; | |
9682 | signal_program[i] = 1; | |
ab04a2af | 9683 | signal_catch[i] = 0; |
c906108c SS |
9684 | } |
9685 | ||
4d9d9d04 PA |
9686 | /* Signals caused by debugger's own actions should not be given to |
9687 | the program afterwards. | |
9688 | ||
9689 | Do not deliver GDB_SIGNAL_TRAP by default, except when the user | |
9690 | explicitly specifies that it should be delivered to the target | |
9691 | program. Typically, that would occur when a user is debugging a | |
9692 | target monitor on a simulator: the target monitor sets a | |
9693 | breakpoint; the simulator encounters this breakpoint and halts | |
9694 | the simulation handing control to GDB; GDB, noting that the stop | |
9695 | address doesn't map to any known breakpoint, returns control back | |
9696 | to the simulator; the simulator then delivers the hardware | |
9697 | equivalent of a GDB_SIGNAL_TRAP to the program being | |
9698 | debugged. */ | |
a493e3e2 PA |
9699 | signal_program[GDB_SIGNAL_TRAP] = 0; |
9700 | signal_program[GDB_SIGNAL_INT] = 0; | |
c906108c SS |
9701 | |
9702 | /* Signals that are not errors should not normally enter the debugger. */ | |
a493e3e2 PA |
9703 | signal_stop[GDB_SIGNAL_ALRM] = 0; |
9704 | signal_print[GDB_SIGNAL_ALRM] = 0; | |
9705 | signal_stop[GDB_SIGNAL_VTALRM] = 0; | |
9706 | signal_print[GDB_SIGNAL_VTALRM] = 0; | |
9707 | signal_stop[GDB_SIGNAL_PROF] = 0; | |
9708 | signal_print[GDB_SIGNAL_PROF] = 0; | |
9709 | signal_stop[GDB_SIGNAL_CHLD] = 0; | |
9710 | signal_print[GDB_SIGNAL_CHLD] = 0; | |
9711 | signal_stop[GDB_SIGNAL_IO] = 0; | |
9712 | signal_print[GDB_SIGNAL_IO] = 0; | |
9713 | signal_stop[GDB_SIGNAL_POLL] = 0; | |
9714 | signal_print[GDB_SIGNAL_POLL] = 0; | |
9715 | signal_stop[GDB_SIGNAL_URG] = 0; | |
9716 | signal_print[GDB_SIGNAL_URG] = 0; | |
9717 | signal_stop[GDB_SIGNAL_WINCH] = 0; | |
9718 | signal_print[GDB_SIGNAL_WINCH] = 0; | |
9719 | signal_stop[GDB_SIGNAL_PRIO] = 0; | |
9720 | signal_print[GDB_SIGNAL_PRIO] = 0; | |
c906108c | 9721 | |
cd0fc7c3 SS |
9722 | /* These signals are used internally by user-level thread |
9723 | implementations. (See signal(5) on Solaris.) Like the above | |
9724 | signals, a healthy program receives and handles them as part of | |
9725 | its normal operation. */ | |
a493e3e2 PA |
9726 | signal_stop[GDB_SIGNAL_LWP] = 0; |
9727 | signal_print[GDB_SIGNAL_LWP] = 0; | |
9728 | signal_stop[GDB_SIGNAL_WAITING] = 0; | |
9729 | signal_print[GDB_SIGNAL_WAITING] = 0; | |
9730 | signal_stop[GDB_SIGNAL_CANCEL] = 0; | |
9731 | signal_print[GDB_SIGNAL_CANCEL] = 0; | |
bc7b765a JB |
9732 | signal_stop[GDB_SIGNAL_LIBRT] = 0; |
9733 | signal_print[GDB_SIGNAL_LIBRT] = 0; | |
cd0fc7c3 | 9734 | |
2455069d UW |
9735 | /* Update cached state. */ |
9736 | signal_cache_update (-1); | |
9737 | ||
85c07804 AC |
9738 | add_setshow_zinteger_cmd ("stop-on-solib-events", class_support, |
9739 | &stop_on_solib_events, _("\ | |
9740 | Set stopping for shared library events."), _("\ | |
9741 | Show stopping for shared library events."), _("\ | |
c906108c SS |
9742 | If nonzero, gdb will give control to the user when the dynamic linker\n\ |
9743 | notifies gdb of shared library events. The most common event of interest\n\ | |
85c07804 | 9744 | to the user would be loading/unloading of a new library."), |
f9e14852 | 9745 | set_stop_on_solib_events, |
920d2a44 | 9746 | show_stop_on_solib_events, |
85c07804 | 9747 | &setlist, &showlist); |
c906108c | 9748 | |
7ab04401 AC |
9749 | add_setshow_enum_cmd ("follow-fork-mode", class_run, |
9750 | follow_fork_mode_kind_names, | |
9751 | &follow_fork_mode_string, _("\ | |
9752 | Set debugger response to a program call of fork or vfork."), _("\ | |
9753 | Show debugger response to a program call of fork or vfork."), _("\ | |
c906108c SS |
9754 | A fork or vfork creates a new process. follow-fork-mode can be:\n\ |
9755 | parent - the original process is debugged after a fork\n\ | |
9756 | child - the new process is debugged after a fork\n\ | |
ea1dd7bc | 9757 | The unfollowed process will continue to run.\n\ |
7ab04401 | 9758 | By default, the debugger will follow the parent process."), |
03acd4d8 | 9759 | nullptr, |
920d2a44 | 9760 | show_follow_fork_mode_string, |
7ab04401 AC |
9761 | &setlist, &showlist); |
9762 | ||
6c95b8df PA |
9763 | add_setshow_enum_cmd ("follow-exec-mode", class_run, |
9764 | follow_exec_mode_names, | |
9765 | &follow_exec_mode_string, _("\ | |
9766 | Set debugger response to a program call of exec."), _("\ | |
9767 | Show debugger response to a program call of exec."), _("\ | |
9768 | An exec call replaces the program image of a process.\n\ | |
9769 | \n\ | |
9770 | follow-exec-mode can be:\n\ | |
9771 | \n\ | |
cce7e648 | 9772 | new - the debugger creates a new inferior and rebinds the process\n\ |
6c95b8df PA |
9773 | to this new inferior. The program the process was running before\n\ |
9774 | the exec call can be restarted afterwards by restarting the original\n\ | |
9775 | inferior.\n\ | |
9776 | \n\ | |
9777 | same - the debugger keeps the process bound to the same inferior.\n\ | |
9778 | The new executable image replaces the previous executable loaded in\n\ | |
9779 | the inferior. Restarting the inferior after the exec call restarts\n\ | |
9780 | the executable the process was running after the exec call.\n\ | |
9781 | \n\ | |
9782 | By default, the debugger will use the same inferior."), | |
03acd4d8 | 9783 | nullptr, |
6c95b8df PA |
9784 | show_follow_exec_mode_string, |
9785 | &setlist, &showlist); | |
9786 | ||
7ab04401 AC |
9787 | add_setshow_enum_cmd ("scheduler-locking", class_run, |
9788 | scheduler_enums, &scheduler_mode, _("\ | |
9789 | Set mode for locking scheduler during execution."), _("\ | |
9790 | Show mode for locking scheduler during execution."), _("\ | |
f2665db5 MM |
9791 | off == no locking (threads may preempt at any time)\n\ |
9792 | on == full locking (no thread except the current thread may run)\n\ | |
dda83cd7 | 9793 | This applies to both normal execution and replay mode.\n\ |
f2665db5 | 9794 | step == scheduler locked during stepping commands (step, next, stepi, nexti).\n\ |
dda83cd7 SM |
9795 | In this mode, other threads may run during other commands.\n\ |
9796 | This applies to both normal execution and replay mode.\n\ | |
f2665db5 | 9797 | replay == scheduler locked in replay mode and unlocked during normal execution."), |
7ab04401 | 9798 | set_schedlock_func, /* traps on target vector */ |
920d2a44 | 9799 | show_scheduler_mode, |
7ab04401 | 9800 | &setlist, &showlist); |
5fbbeb29 | 9801 | |
d4db2f36 PA |
9802 | add_setshow_boolean_cmd ("schedule-multiple", class_run, &sched_multi, _("\ |
9803 | Set mode for resuming threads of all processes."), _("\ | |
9804 | Show mode for resuming threads of all processes."), _("\ | |
9805 | When on, execution commands (such as 'continue' or 'next') resume all\n\ | |
9806 | threads of all processes. When off (which is the default), execution\n\ | |
9807 | commands only resume the threads of the current process. The set of\n\ | |
9808 | threads that are resumed is further refined by the scheduler-locking\n\ | |
9809 | mode (see help set scheduler-locking)."), | |
03acd4d8 | 9810 | nullptr, |
d4db2f36 PA |
9811 | show_schedule_multiple, |
9812 | &setlist, &showlist); | |
9813 | ||
5bf193a2 AC |
9814 | add_setshow_boolean_cmd ("step-mode", class_run, &step_stop_if_no_debug, _("\ |
9815 | Set mode of the step operation."), _("\ | |
9816 | Show mode of the step operation."), _("\ | |
9817 | When set, doing a step over a function without debug line information\n\ | |
9818 | will stop at the first instruction of that function. Otherwise, the\n\ | |
9819 | function is skipped and the step command stops at a different source line."), | |
03acd4d8 | 9820 | nullptr, |
920d2a44 | 9821 | show_step_stop_if_no_debug, |
5bf193a2 | 9822 | &setlist, &showlist); |
ca6724c1 | 9823 | |
72d0e2c5 YQ |
9824 | add_setshow_auto_boolean_cmd ("displaced-stepping", class_run, |
9825 | &can_use_displaced_stepping, _("\ | |
237fc4c9 PA |
9826 | Set debugger's willingness to use displaced stepping."), _("\ |
9827 | Show debugger's willingness to use displaced stepping."), _("\ | |
fff08868 HZ |
9828 | If on, gdb will use displaced stepping to step over breakpoints if it is\n\ |
9829 | supported by the target architecture. If off, gdb will not use displaced\n\ | |
9830 | stepping to step over breakpoints, even if such is supported by the target\n\ | |
9831 | architecture. If auto (which is the default), gdb will use displaced stepping\n\ | |
9832 | if the target architecture supports it and non-stop mode is active, but will not\n\ | |
9833 | use it in all-stop mode (see help set non-stop)."), | |
03acd4d8 | 9834 | nullptr, |
72d0e2c5 YQ |
9835 | show_can_use_displaced_stepping, |
9836 | &setlist, &showlist); | |
237fc4c9 | 9837 | |
b2175913 MS |
9838 | add_setshow_enum_cmd ("exec-direction", class_run, exec_direction_names, |
9839 | &exec_direction, _("Set direction of execution.\n\ | |
9840 | Options are 'forward' or 'reverse'."), | |
9841 | _("Show direction of execution (forward/reverse)."), | |
9842 | _("Tells gdb whether to execute forward or backward."), | |
9843 | set_exec_direction_func, show_exec_direction_func, | |
9844 | &setlist, &showlist); | |
9845 | ||
6c95b8df PA |
9846 | /* Set/show detach-on-fork: user-settable mode. */ |
9847 | ||
9848 | add_setshow_boolean_cmd ("detach-on-fork", class_run, &detach_fork, _("\ | |
9849 | Set whether gdb will detach the child of a fork."), _("\ | |
9850 | Show whether gdb will detach the child of a fork."), _("\ | |
9851 | Tells gdb whether to detach the child of a fork."), | |
03acd4d8 | 9852 | nullptr, nullptr, &setlist, &showlist); |
6c95b8df | 9853 | |
03583c20 UW |
9854 | /* Set/show disable address space randomization mode. */ |
9855 | ||
9856 | add_setshow_boolean_cmd ("disable-randomization", class_support, | |
9857 | &disable_randomization, _("\ | |
9858 | Set disabling of debuggee's virtual address space randomization."), _("\ | |
9859 | Show disabling of debuggee's virtual address space randomization."), _("\ | |
9860 | When this mode is on (which is the default), randomization of the virtual\n\ | |
9861 | address space is disabled. Standalone programs run with the randomization\n\ | |
9862 | enabled by default on some platforms."), | |
9863 | &set_disable_randomization, | |
9864 | &show_disable_randomization, | |
9865 | &setlist, &showlist); | |
9866 | ||
ca6724c1 | 9867 | /* ptid initializations */ |
ca6724c1 KB |
9868 | inferior_ptid = null_ptid; |
9869 | target_last_wait_ptid = minus_one_ptid; | |
5231c1fd | 9870 | |
c90e7d63 SM |
9871 | gdb::observers::thread_ptid_changed.attach (infrun_thread_ptid_changed, |
9872 | "infrun"); | |
9873 | gdb::observers::thread_stop_requested.attach (infrun_thread_stop_requested, | |
9874 | "infrun"); | |
9875 | gdb::observers::thread_exit.attach (infrun_thread_thread_exit, "infrun"); | |
9876 | gdb::observers::inferior_exit.attach (infrun_inferior_exit, "infrun"); | |
9877 | gdb::observers::inferior_execd.attach (infrun_inferior_execd, "infrun"); | |
4aa995e1 PA |
9878 | |
9879 | /* Explicitly create without lookup, since that tries to create a | |
9880 | value with a void typed value, and when we get here, gdbarch | |
9881 | isn't initialized yet. At this point, we're quite sure there | |
9882 | isn't another convenience variable of the same name. */ | |
03acd4d8 | 9883 | create_internalvar_type_lazy ("_siginfo", &siginfo_funcs, nullptr); |
d914c394 SS |
9884 | |
9885 | add_setshow_boolean_cmd ("observer", no_class, | |
9886 | &observer_mode_1, _("\ | |
9887 | Set whether gdb controls the inferior in observer mode."), _("\ | |
9888 | Show whether gdb controls the inferior in observer mode."), _("\ | |
9889 | In observer mode, GDB can get data from the inferior, but not\n\ | |
9890 | affect its execution. Registers and memory may not be changed,\n\ | |
9891 | breakpoints may not be set, and the program cannot be interrupted\n\ | |
9892 | or signalled."), | |
9893 | set_observer_mode, | |
9894 | show_observer_mode, | |
9895 | &setlist, | |
9896 | &showlist); | |
b161a60d SM |
9897 | |
9898 | #if GDB_SELF_TEST | |
9899 | selftests::register_test ("infrun_thread_ptid_changed", | |
9900 | selftests::infrun_thread_ptid_changed); | |
9901 | #endif | |
c906108c | 9902 | } |