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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 | |
4a94e368 | 4 | Copyright (C) 1986-2022 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 | |
bd2b40ac | 87 | static void insert_hp_step_resume_breakpoint_at_frame (frame_info_ptr ); |
2484c66b | 88 | |
bd2b40ac | 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 | { | |
d914c394 | 262 | pagination_enabled = 0; |
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, | |
391 | NULL | |
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; | |
481 | copy_inferior_target_desc_info (child_inf, parent_inf); | |
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; | |
498 | child_inf->pending_detach = 0; | |
499 | parent_inf->vfork_child = child_inf; | |
500 | parent_inf->pending_detach = 0; | |
501 | } | |
502 | else | |
503 | { | |
b382c166 | 504 | child_inf->aspace = new address_space (); |
564b1e3f | 505 | child_inf->pspace = new program_space (child_inf->aspace); |
d83ad864 | 506 | child_inf->removable = 1; |
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; | |
549 | copy_inferior_target_desc_info (child_inf, parent_inf); | |
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); |
d83ad864 DB |
588 | child_inf->removable = 1; |
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 | { | |
647 | gdb_assert (child_inf->vfork_parent == NULL); | |
648 | gdb_assert (parent_inf->vfork_child == NULL); | |
649 | child_inf->vfork_parent = parent_inf; | |
650 | child_inf->pending_detach = 0; | |
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. */ | |
703 | struct breakpoint *step_resume_breakpoint = NULL; | |
186c406b | 704 | struct breakpoint *exception_resume_breakpoint = NULL; |
4e3990f4 DE |
705 | CORE_ADDR step_range_start = 0; |
706 | CORE_ADDR step_range_end = 0; | |
bf4cb9be TV |
707 | int current_line = 0; |
708 | symtab *current_symtab = NULL; | |
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; | |
933 | inf->vfork_parent->vfork_child = NULL; | |
934 | inf->vfork_parent = NULL; | |
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 | |
b73715df | 945 | vfork_parent->pending_detach = 0; |
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; | |
967 | inf->aspace = NULL; | |
968 | inf->pspace = NULL; | |
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 PA |
1000 | inf->aspace = inf->pspace->aspace; |
1001 | inf->removable = 1; | |
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); | |
6c95b8df | 1026 | inf->removable = 1; |
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, | |
1107 | NULL, | |
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 (); |
8358c15c | 1181 | th->control.step_resume_breakpoint = NULL; |
186c406b | 1182 | th->control.exception_resume_breakpoint = NULL; |
34b7e8a6 | 1183 | th->control.single_step_breakpoints = NULL; |
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 TT |
1205 | gdb::unique_xmalloc_ptr<char> exec_file_host |
1206 | = exec_file_find (exec_file_target, NULL); | |
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. */ | |
1212 | if (exec_file_host == NULL) | |
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. */ | |
1223 | no_shared_libraries (NULL, 0); | |
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"); |
31e77af2 PA |
1383 | step_over_info.aspace = NULL; |
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 | { | |
1395 | return (step_over_info.aspace != NULL | |
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 | { | |
963f9c80 PA |
1423 | return (step_over_info.aspace != NULL |
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 | { |
00431a78 | 1519 | gdb_assert (thread != NULL); |
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 | { | |
183be222 SM |
1857 | execution_control_state () |
1858 | { | |
1859 | this->reset (); | |
1860 | } | |
1861 | ||
1862 | void reset () | |
1863 | { | |
1864 | this->target = nullptr; | |
1865 | this->ptid = null_ptid; | |
1866 | this->event_thread = nullptr; | |
1867 | ws = target_waitstatus (); | |
1868 | stop_func_filled_in = 0; | |
1869 | stop_func_start = 0; | |
1870 | stop_func_end = 0; | |
1871 | stop_func_name = nullptr; | |
1872 | wait_some_more = 0; | |
1873 | hit_singlestep_breakpoint = 0; | |
1874 | } | |
1875 | ||
5b6d1e4f | 1876 | process_stratum_target *target; |
4d9d9d04 PA |
1877 | ptid_t ptid; |
1878 | /* The thread that got the event, if this was a thread event; NULL | |
1879 | otherwise. */ | |
1880 | struct thread_info *event_thread; | |
1881 | ||
1882 | struct target_waitstatus ws; | |
1883 | int stop_func_filled_in; | |
1884 | CORE_ADDR stop_func_start; | |
1885 | CORE_ADDR stop_func_end; | |
1886 | const char *stop_func_name; | |
1887 | int wait_some_more; | |
1888 | ||
1889 | /* True if the event thread hit the single-step breakpoint of | |
1890 | another thread. Thus the event doesn't cause a stop, the thread | |
1891 | needs to be single-stepped past the single-step breakpoint before | |
1892 | we can switch back to the original stepping thread. */ | |
1893 | int hit_singlestep_breakpoint; | |
1894 | }; | |
1895 | ||
1896 | /* Clear ECS and set it to point at TP. */ | |
c2829269 PA |
1897 | |
1898 | static void | |
4d9d9d04 PA |
1899 | reset_ecs (struct execution_control_state *ecs, struct thread_info *tp) |
1900 | { | |
183be222 | 1901 | ecs->reset (); |
4d9d9d04 PA |
1902 | ecs->event_thread = tp; |
1903 | ecs->ptid = tp->ptid; | |
1904 | } | |
1905 | ||
1906 | static void keep_going_pass_signal (struct execution_control_state *ecs); | |
1907 | static void prepare_to_wait (struct execution_control_state *ecs); | |
c4464ade | 1908 | static bool keep_going_stepped_thread (struct thread_info *tp); |
8d297bbf | 1909 | static step_over_what thread_still_needs_step_over (struct thread_info *tp); |
4d9d9d04 PA |
1910 | |
1911 | /* Are there any pending step-over requests? If so, run all we can | |
1912 | now and return true. Otherwise, return false. */ | |
1913 | ||
c4464ade | 1914 | static bool |
c2829269 PA |
1915 | start_step_over (void) |
1916 | { | |
3ec3145c SM |
1917 | INFRUN_SCOPED_DEBUG_ENTER_EXIT; |
1918 | ||
372316f1 PA |
1919 | /* Don't start a new step-over if we already have an in-line |
1920 | step-over operation ongoing. */ | |
1921 | if (step_over_info_valid_p ()) | |
c4464ade | 1922 | return false; |
372316f1 | 1923 | |
187b041e SM |
1924 | /* Steal the global thread step over chain. As we try to initiate displaced |
1925 | steps, threads will be enqueued in the global chain if no buffers are | |
1926 | available. If we iterated on the global chain directly, we might iterate | |
1927 | indefinitely. */ | |
8b6a69b2 SM |
1928 | thread_step_over_list threads_to_step |
1929 | = std::move (global_thread_step_over_list); | |
187b041e SM |
1930 | |
1931 | infrun_debug_printf ("stealing global queue of threads to step, length = %d", | |
1932 | thread_step_over_chain_length (threads_to_step)); | |
1933 | ||
1934 | bool started = false; | |
1935 | ||
1936 | /* On scope exit (whatever the reason, return or exception), if there are | |
1937 | threads left in the THREADS_TO_STEP chain, put back these threads in the | |
1938 | global list. */ | |
1939 | SCOPE_EXIT | |
1940 | { | |
8b6a69b2 | 1941 | if (threads_to_step.empty ()) |
187b041e SM |
1942 | infrun_debug_printf ("step-over queue now empty"); |
1943 | else | |
1944 | { | |
1945 | infrun_debug_printf ("putting back %d threads to step in global queue", | |
1946 | thread_step_over_chain_length (threads_to_step)); | |
1947 | ||
8b6a69b2 SM |
1948 | global_thread_step_over_chain_enqueue_chain |
1949 | (std::move (threads_to_step)); | |
187b041e SM |
1950 | } |
1951 | }; | |
1952 | ||
8b6a69b2 SM |
1953 | thread_step_over_list_safe_range range |
1954 | = make_thread_step_over_list_safe_range (threads_to_step); | |
1955 | ||
1956 | for (thread_info *tp : range) | |
237fc4c9 | 1957 | { |
4d9d9d04 PA |
1958 | struct execution_control_state ecss; |
1959 | struct execution_control_state *ecs = &ecss; | |
8d297bbf | 1960 | step_over_what step_what; |
372316f1 | 1961 | int must_be_in_line; |
c2829269 | 1962 | |
c65d6b55 PA |
1963 | gdb_assert (!tp->stop_requested); |
1964 | ||
187b041e SM |
1965 | if (tp->inf->displaced_step_state.unavailable) |
1966 | { | |
1967 | /* The arch told us to not even try preparing another displaced step | |
1968 | for this inferior. Just leave the thread in THREADS_TO_STEP, it | |
1969 | will get moved to the global chain on scope exit. */ | |
1970 | continue; | |
1971 | } | |
1972 | ||
d8bbae6e SM |
1973 | if (tp->inf->thread_waiting_for_vfork_done != nullptr) |
1974 | { | |
1975 | /* When we stop all threads, handling a vfork, any thread in the step | |
1976 | over chain remains there. A user could also try to continue a | |
1977 | thread stopped at a breakpoint while another thread is waiting for | |
1978 | a vfork-done event. In any case, we don't want to start a step | |
1979 | over right now. */ | |
1980 | continue; | |
1981 | } | |
1982 | ||
187b041e SM |
1983 | /* Remove thread from the THREADS_TO_STEP chain. If anything goes wrong |
1984 | while we try to prepare the displaced step, we don't add it back to | |
1985 | the global step over chain. This is to avoid a thread staying in the | |
1986 | step over chain indefinitely if something goes wrong when resuming it | |
1987 | If the error is intermittent and it still needs a step over, it will | |
1988 | get enqueued again when we try to resume it normally. */ | |
8b6a69b2 | 1989 | threads_to_step.erase (threads_to_step.iterator_to (*tp)); |
c2829269 | 1990 | |
372316f1 PA |
1991 | step_what = thread_still_needs_step_over (tp); |
1992 | must_be_in_line = ((step_what & STEP_OVER_WATCHPOINT) | |
1993 | || ((step_what & STEP_OVER_BREAKPOINT) | |
3fc8eb30 | 1994 | && !use_displaced_stepping (tp))); |
372316f1 PA |
1995 | |
1996 | /* We currently stop all threads of all processes to step-over | |
1997 | in-line. If we need to start a new in-line step-over, let | |
1998 | any pending displaced steps finish first. */ | |
187b041e SM |
1999 | if (must_be_in_line && displaced_step_in_progress_any_thread ()) |
2000 | { | |
2001 | global_thread_step_over_chain_enqueue (tp); | |
2002 | continue; | |
2003 | } | |
c2829269 | 2004 | |
372316f1 | 2005 | if (tp->control.trap_expected |
7846f3aa | 2006 | || tp->resumed () |
611841bb | 2007 | || tp->executing ()) |
ad53cd71 | 2008 | { |
f34652de | 2009 | internal_error ("[%s] has inconsistent state: " |
372316f1 | 2010 | "trap_expected=%d, resumed=%d, executing=%d\n", |
0fab7955 | 2011 | tp->ptid.to_string ().c_str (), |
4d9d9d04 | 2012 | tp->control.trap_expected, |
7846f3aa | 2013 | tp->resumed (), |
611841bb | 2014 | tp->executing ()); |
ad53cd71 | 2015 | } |
1c5cfe86 | 2016 | |
1eb8556f | 2017 | infrun_debug_printf ("resuming [%s] for step-over", |
0fab7955 | 2018 | tp->ptid.to_string ().c_str ()); |
4d9d9d04 PA |
2019 | |
2020 | /* keep_going_pass_signal skips the step-over if the breakpoint | |
2021 | is no longer inserted. In all-stop, we want to keep looking | |
2022 | for a thread that needs a step-over instead of resuming TP, | |
2023 | because we wouldn't be able to resume anything else until the | |
2024 | target stops again. In non-stop, the resume always resumes | |
2025 | only TP, so it's OK to let the thread resume freely. */ | |
fbea99ea | 2026 | if (!target_is_non_stop_p () && !step_what) |
4d9d9d04 | 2027 | continue; |
8550d3b3 | 2028 | |
00431a78 | 2029 | switch_to_thread (tp); |
4d9d9d04 PA |
2030 | reset_ecs (ecs, tp); |
2031 | keep_going_pass_signal (ecs); | |
1c5cfe86 | 2032 | |
4d9d9d04 PA |
2033 | if (!ecs->wait_some_more) |
2034 | error (_("Command aborted.")); | |
1c5cfe86 | 2035 | |
187b041e SM |
2036 | /* If the thread's step over could not be initiated because no buffers |
2037 | were available, it was re-added to the global step over chain. */ | |
7846f3aa | 2038 | if (tp->resumed ()) |
187b041e SM |
2039 | { |
2040 | infrun_debug_printf ("[%s] was resumed.", | |
0fab7955 | 2041 | tp->ptid.to_string ().c_str ()); |
187b041e SM |
2042 | gdb_assert (!thread_is_in_step_over_chain (tp)); |
2043 | } | |
2044 | else | |
2045 | { | |
2046 | infrun_debug_printf ("[%s] was NOT resumed.", | |
0fab7955 | 2047 | tp->ptid.to_string ().c_str ()); |
187b041e SM |
2048 | gdb_assert (thread_is_in_step_over_chain (tp)); |
2049 | } | |
372316f1 PA |
2050 | |
2051 | /* If we started a new in-line step-over, we're done. */ | |
2052 | if (step_over_info_valid_p ()) | |
2053 | { | |
2054 | gdb_assert (tp->control.trap_expected); | |
187b041e SM |
2055 | started = true; |
2056 | break; | |
372316f1 PA |
2057 | } |
2058 | ||
fbea99ea | 2059 | if (!target_is_non_stop_p ()) |
4d9d9d04 PA |
2060 | { |
2061 | /* On all-stop, shouldn't have resumed unless we needed a | |
2062 | step over. */ | |
2063 | gdb_assert (tp->control.trap_expected | |
2064 | || tp->step_after_step_resume_breakpoint); | |
2065 | ||
2066 | /* With remote targets (at least), in all-stop, we can't | |
2067 | issue any further remote commands until the program stops | |
2068 | again. */ | |
187b041e SM |
2069 | started = true; |
2070 | break; | |
1c5cfe86 | 2071 | } |
c2829269 | 2072 | |
4d9d9d04 PA |
2073 | /* Either the thread no longer needed a step-over, or a new |
2074 | displaced stepping sequence started. Even in the latter | |
2075 | case, continue looking. Maybe we can also start another | |
2076 | displaced step on a thread of other process. */ | |
237fc4c9 | 2077 | } |
4d9d9d04 | 2078 | |
187b041e | 2079 | return started; |
237fc4c9 PA |
2080 | } |
2081 | ||
5231c1fd PA |
2082 | /* Update global variables holding ptids to hold NEW_PTID if they were |
2083 | holding OLD_PTID. */ | |
2084 | static void | |
b161a60d SM |
2085 | infrun_thread_ptid_changed (process_stratum_target *target, |
2086 | ptid_t old_ptid, ptid_t new_ptid) | |
5231c1fd | 2087 | { |
b161a60d SM |
2088 | if (inferior_ptid == old_ptid |
2089 | && current_inferior ()->process_target () == target) | |
5231c1fd | 2090 | inferior_ptid = new_ptid; |
5231c1fd PA |
2091 | } |
2092 | ||
237fc4c9 | 2093 | \f |
c906108c | 2094 | |
53904c9e AC |
2095 | static const char schedlock_off[] = "off"; |
2096 | static const char schedlock_on[] = "on"; | |
2097 | static const char schedlock_step[] = "step"; | |
f2665db5 | 2098 | static const char schedlock_replay[] = "replay"; |
40478521 | 2099 | static const char *const scheduler_enums[] = { |
ef346e04 AC |
2100 | schedlock_off, |
2101 | schedlock_on, | |
2102 | schedlock_step, | |
f2665db5 | 2103 | schedlock_replay, |
ef346e04 AC |
2104 | NULL |
2105 | }; | |
f2665db5 | 2106 | static const char *scheduler_mode = schedlock_replay; |
920d2a44 AC |
2107 | static void |
2108 | show_scheduler_mode (struct ui_file *file, int from_tty, | |
2109 | struct cmd_list_element *c, const char *value) | |
2110 | { | |
6cb06a8c TT |
2111 | gdb_printf (file, |
2112 | _("Mode for locking scheduler " | |
2113 | "during execution is \"%s\".\n"), | |
2114 | value); | |
920d2a44 | 2115 | } |
c906108c SS |
2116 | |
2117 | static void | |
eb4c3f4a | 2118 | set_schedlock_func (const char *args, int from_tty, struct cmd_list_element *c) |
c906108c | 2119 | { |
8a3ecb79 | 2120 | if (!target_can_lock_scheduler ()) |
eefe576e AC |
2121 | { |
2122 | scheduler_mode = schedlock_off; | |
d777bf0d SM |
2123 | error (_("Target '%s' cannot support this command."), |
2124 | target_shortname ()); | |
eefe576e | 2125 | } |
c906108c SS |
2126 | } |
2127 | ||
d4db2f36 PA |
2128 | /* True if execution commands resume all threads of all processes by |
2129 | default; otherwise, resume only threads of the current inferior | |
2130 | process. */ | |
491144b5 | 2131 | bool sched_multi = false; |
d4db2f36 | 2132 | |
22b11ba9 LS |
2133 | /* Try to setup for software single stepping. Return true if target_resume() |
2134 | should use hardware single step. | |
2facfe5c | 2135 | |
22b11ba9 | 2136 | GDBARCH the current gdbarch. */ |
2facfe5c | 2137 | |
c4464ade | 2138 | static bool |
22b11ba9 | 2139 | maybe_software_singlestep (struct gdbarch *gdbarch) |
2facfe5c | 2140 | { |
c4464ade | 2141 | bool hw_step = true; |
2facfe5c | 2142 | |
f02253f1 | 2143 | if (execution_direction == EXEC_FORWARD |
93f9a11f YQ |
2144 | && gdbarch_software_single_step_p (gdbarch)) |
2145 | hw_step = !insert_single_step_breakpoints (gdbarch); | |
2146 | ||
2facfe5c DD |
2147 | return hw_step; |
2148 | } | |
c906108c | 2149 | |
f3263aa4 PA |
2150 | /* See infrun.h. */ |
2151 | ||
09cee04b PA |
2152 | ptid_t |
2153 | user_visible_resume_ptid (int step) | |
2154 | { | |
f3263aa4 | 2155 | ptid_t resume_ptid; |
09cee04b | 2156 | |
09cee04b PA |
2157 | if (non_stop) |
2158 | { | |
2159 | /* With non-stop mode on, threads are always handled | |
2160 | individually. */ | |
2161 | resume_ptid = inferior_ptid; | |
2162 | } | |
2163 | else if ((scheduler_mode == schedlock_on) | |
03d46957 | 2164 | || (scheduler_mode == schedlock_step && step)) |
09cee04b | 2165 | { |
f3263aa4 PA |
2166 | /* User-settable 'scheduler' mode requires solo thread |
2167 | resume. */ | |
09cee04b PA |
2168 | resume_ptid = inferior_ptid; |
2169 | } | |
f2665db5 MM |
2170 | else if ((scheduler_mode == schedlock_replay) |
2171 | && target_record_will_replay (minus_one_ptid, execution_direction)) | |
2172 | { | |
2173 | /* User-settable 'scheduler' mode requires solo thread resume in replay | |
2174 | mode. */ | |
2175 | resume_ptid = inferior_ptid; | |
2176 | } | |
f3263aa4 PA |
2177 | else if (!sched_multi && target_supports_multi_process ()) |
2178 | { | |
2179 | /* Resume all threads of the current process (and none of other | |
2180 | processes). */ | |
e99b03dc | 2181 | resume_ptid = ptid_t (inferior_ptid.pid ()); |
f3263aa4 PA |
2182 | } |
2183 | else | |
2184 | { | |
2185 | /* Resume all threads of all processes. */ | |
2186 | resume_ptid = RESUME_ALL; | |
2187 | } | |
09cee04b PA |
2188 | |
2189 | return resume_ptid; | |
2190 | } | |
2191 | ||
5b6d1e4f PA |
2192 | /* See infrun.h. */ |
2193 | ||
2194 | process_stratum_target * | |
2195 | user_visible_resume_target (ptid_t resume_ptid) | |
2196 | { | |
2197 | return (resume_ptid == minus_one_ptid && sched_multi | |
2198 | ? NULL | |
2199 | : current_inferior ()->process_target ()); | |
2200 | } | |
2201 | ||
fbea99ea PA |
2202 | /* Return a ptid representing the set of threads that we will resume, |
2203 | in the perspective of the target, assuming run control handling | |
2204 | does not require leaving some threads stopped (e.g., stepping past | |
2205 | breakpoint). USER_STEP indicates whether we're about to start the | |
2206 | target for a stepping command. */ | |
2207 | ||
2208 | static ptid_t | |
2209 | internal_resume_ptid (int user_step) | |
2210 | { | |
2211 | /* In non-stop, we always control threads individually. Note that | |
2212 | the target may always work in non-stop mode even with "set | |
2213 | non-stop off", in which case user_visible_resume_ptid could | |
2214 | return a wildcard ptid. */ | |
2215 | if (target_is_non_stop_p ()) | |
2216 | return inferior_ptid; | |
d8bbae6e SM |
2217 | |
2218 | /* The rest of the function assumes non-stop==off and | |
2219 | target-non-stop==off. | |
2220 | ||
2221 | If a thread is waiting for a vfork-done event, it means breakpoints are out | |
2222 | for this inferior (well, program space in fact). We don't want to resume | |
2223 | any thread other than the one waiting for vfork done, otherwise these other | |
2224 | threads could miss breakpoints. So if a thread in the resumption set is | |
2225 | waiting for a vfork-done event, resume only that thread. | |
2226 | ||
2227 | The resumption set width depends on whether schedule-multiple is on or off. | |
2228 | ||
2229 | Note that if the target_resume interface was more flexible, we could be | |
2230 | smarter here when schedule-multiple is on. For example, imagine 3 | |
2231 | inferiors with 2 threads each (1.1, 1.2, 2.1, 2.2, 3.1 and 3.2). Threads | |
2232 | 2.1 and 3.2 are both waiting for a vfork-done event. Then we could ask the | |
2233 | target(s) to resume: | |
2234 | ||
2235 | - All threads of inferior 1 | |
2236 | - Thread 2.1 | |
2237 | - Thread 3.2 | |
2238 | ||
2239 | Since we don't have that flexibility (we can only pass one ptid), just | |
2240 | resume the first thread waiting for a vfork-done event we find (e.g. thread | |
2241 | 2.1). */ | |
2242 | if (sched_multi) | |
2243 | { | |
2244 | for (inferior *inf : all_non_exited_inferiors ()) | |
2245 | if (inf->thread_waiting_for_vfork_done != nullptr) | |
2246 | return inf->thread_waiting_for_vfork_done->ptid; | |
2247 | } | |
2248 | else if (current_inferior ()->thread_waiting_for_vfork_done != nullptr) | |
2249 | return current_inferior ()->thread_waiting_for_vfork_done->ptid; | |
2250 | ||
2251 | return user_visible_resume_ptid (user_step); | |
fbea99ea PA |
2252 | } |
2253 | ||
64ce06e4 PA |
2254 | /* Wrapper for target_resume, that handles infrun-specific |
2255 | bookkeeping. */ | |
2256 | ||
2257 | static void | |
c4464ade | 2258 | do_target_resume (ptid_t resume_ptid, bool step, enum gdb_signal sig) |
64ce06e4 PA |
2259 | { |
2260 | struct thread_info *tp = inferior_thread (); | |
2261 | ||
c65d6b55 PA |
2262 | gdb_assert (!tp->stop_requested); |
2263 | ||
64ce06e4 | 2264 | /* Install inferior's terminal modes. */ |
223ffa71 | 2265 | target_terminal::inferior (); |
64ce06e4 PA |
2266 | |
2267 | /* Avoid confusing the next resume, if the next stop/resume | |
2268 | happens to apply to another thread. */ | |
1edb66d8 | 2269 | tp->set_stop_signal (GDB_SIGNAL_0); |
64ce06e4 | 2270 | |
8f572e5c PA |
2271 | /* Advise target which signals may be handled silently. |
2272 | ||
2273 | If we have removed breakpoints because we are stepping over one | |
2274 | in-line (in any thread), we need to receive all signals to avoid | |
2275 | accidentally skipping a breakpoint during execution of a signal | |
2276 | handler. | |
2277 | ||
2278 | Likewise if we're displaced stepping, otherwise a trap for a | |
2279 | breakpoint in a signal handler might be confused with the | |
7def77a1 | 2280 | displaced step finishing. We don't make the displaced_step_finish |
8f572e5c PA |
2281 | step distinguish the cases instead, because: |
2282 | ||
2283 | - a backtrace while stopped in the signal handler would show the | |
2284 | scratch pad as frame older than the signal handler, instead of | |
2285 | the real mainline code. | |
2286 | ||
2287 | - when the thread is later resumed, the signal handler would | |
2288 | return to the scratch pad area, which would no longer be | |
2289 | valid. */ | |
2290 | if (step_over_info_valid_p () | |
00431a78 | 2291 | || displaced_step_in_progress (tp->inf)) |
adc6a863 | 2292 | target_pass_signals ({}); |
64ce06e4 | 2293 | else |
adc6a863 | 2294 | target_pass_signals (signal_pass); |
64ce06e4 | 2295 | |
05d65a7a SM |
2296 | infrun_debug_printf ("resume_ptid=%s, step=%d, sig=%s", |
2297 | resume_ptid.to_string ().c_str (), | |
2298 | step, gdb_signal_to_symbol_string (sig)); | |
2299 | ||
64ce06e4 PA |
2300 | target_resume (resume_ptid, step, sig); |
2301 | } | |
2302 | ||
d930703d | 2303 | /* Resume the inferior. SIG is the signal to give the inferior |
71d378ae PA |
2304 | (GDB_SIGNAL_0 for none). Note: don't call this directly; instead |
2305 | call 'resume', which handles exceptions. */ | |
c906108c | 2306 | |
71d378ae PA |
2307 | static void |
2308 | resume_1 (enum gdb_signal sig) | |
c906108c | 2309 | { |
515630c5 | 2310 | struct regcache *regcache = get_current_regcache (); |
ac7936df | 2311 | struct gdbarch *gdbarch = regcache->arch (); |
4e1c45ea | 2312 | struct thread_info *tp = inferior_thread (); |
8b86c959 | 2313 | const address_space *aspace = regcache->aspace (); |
b0f16a3e | 2314 | ptid_t resume_ptid; |
856e7dd6 PA |
2315 | /* This represents the user's step vs continue request. When |
2316 | deciding whether "set scheduler-locking step" applies, it's the | |
2317 | user's intention that counts. */ | |
2318 | const int user_step = tp->control.stepping_command; | |
64ce06e4 PA |
2319 | /* This represents what we'll actually request the target to do. |
2320 | This can decay from a step to a continue, if e.g., we need to | |
2321 | implement single-stepping with breakpoints (software | |
2322 | single-step). */ | |
c4464ade | 2323 | bool step; |
c7e8a53c | 2324 | |
c65d6b55 | 2325 | gdb_assert (!tp->stop_requested); |
c2829269 PA |
2326 | gdb_assert (!thread_is_in_step_over_chain (tp)); |
2327 | ||
1edb66d8 | 2328 | if (tp->has_pending_waitstatus ()) |
372316f1 | 2329 | { |
1eb8556f SM |
2330 | infrun_debug_printf |
2331 | ("thread %s has pending wait " | |
2332 | "status %s (currently_stepping=%d).", | |
0fab7955 | 2333 | tp->ptid.to_string ().c_str (), |
7dca2ea7 | 2334 | tp->pending_waitstatus ().to_string ().c_str (), |
1eb8556f | 2335 | currently_stepping (tp)); |
372316f1 | 2336 | |
5b6d1e4f | 2337 | tp->inf->process_target ()->threads_executing = true; |
7846f3aa | 2338 | tp->set_resumed (true); |
372316f1 PA |
2339 | |
2340 | /* FIXME: What should we do if we are supposed to resume this | |
2341 | thread with a signal? Maybe we should maintain a queue of | |
2342 | pending signals to deliver. */ | |
2343 | if (sig != GDB_SIGNAL_0) | |
2344 | { | |
fd7dcb94 | 2345 | warning (_("Couldn't deliver signal %s to %s."), |
a068643d | 2346 | gdb_signal_to_name (sig), |
0fab7955 | 2347 | tp->ptid.to_string ().c_str ()); |
372316f1 PA |
2348 | } |
2349 | ||
1edb66d8 | 2350 | tp->set_stop_signal (GDB_SIGNAL_0); |
372316f1 PA |
2351 | |
2352 | if (target_can_async_p ()) | |
9516f85a | 2353 | { |
4a570176 | 2354 | target_async (true); |
9516f85a AB |
2355 | /* Tell the event loop we have an event to process. */ |
2356 | mark_async_event_handler (infrun_async_inferior_event_token); | |
2357 | } | |
372316f1 PA |
2358 | return; |
2359 | } | |
2360 | ||
2361 | tp->stepped_breakpoint = 0; | |
2362 | ||
6b403daa PA |
2363 | /* Depends on stepped_breakpoint. */ |
2364 | step = currently_stepping (tp); | |
2365 | ||
6f5d514f | 2366 | if (current_inferior ()->thread_waiting_for_vfork_done != nullptr) |
74609e71 | 2367 | { |
48f9886d PA |
2368 | /* Don't try to single-step a vfork parent that is waiting for |
2369 | the child to get out of the shared memory region (by exec'ing | |
2370 | or exiting). This is particularly important on software | |
2371 | single-step archs, as the child process would trip on the | |
2372 | software single step breakpoint inserted for the parent | |
2373 | process. Since the parent will not actually execute any | |
2374 | instruction until the child is out of the shared region (such | |
2375 | are vfork's semantics), it is safe to simply continue it. | |
2376 | Eventually, we'll see a TARGET_WAITKIND_VFORK_DONE event for | |
2377 | the parent, and tell it to `keep_going', which automatically | |
2378 | re-sets it stepping. */ | |
1eb8556f | 2379 | infrun_debug_printf ("resume : clear step"); |
c4464ade | 2380 | step = false; |
74609e71 YQ |
2381 | } |
2382 | ||
7ca9b62a TBA |
2383 | CORE_ADDR pc = regcache_read_pc (regcache); |
2384 | ||
1eb8556f SM |
2385 | infrun_debug_printf ("step=%d, signal=%s, trap_expected=%d, " |
2386 | "current thread [%s] at %s", | |
2387 | step, gdb_signal_to_symbol_string (sig), | |
2388 | tp->control.trap_expected, | |
0fab7955 | 2389 | inferior_ptid.to_string ().c_str (), |
1eb8556f | 2390 | paddress (gdbarch, pc)); |
c906108c | 2391 | |
c2c6d25f JM |
2392 | /* Normally, by the time we reach `resume', the breakpoints are either |
2393 | removed or inserted, as appropriate. The exception is if we're sitting | |
2394 | at a permanent breakpoint; we need to step over it, but permanent | |
2395 | breakpoints can't be removed. So we have to test for it here. */ | |
6c95b8df | 2396 | if (breakpoint_here_p (aspace, pc) == permanent_breakpoint_here) |
6d350bb5 | 2397 | { |
af48d08f PA |
2398 | if (sig != GDB_SIGNAL_0) |
2399 | { | |
2400 | /* We have a signal to pass to the inferior. The resume | |
2401 | may, or may not take us to the signal handler. If this | |
2402 | is a step, we'll need to stop in the signal handler, if | |
2403 | there's one, (if the target supports stepping into | |
2404 | handlers), or in the next mainline instruction, if | |
2405 | there's no handler. If this is a continue, we need to be | |
2406 | sure to run the handler with all breakpoints inserted. | |
2407 | In all cases, set a breakpoint at the current address | |
2408 | (where the handler returns to), and once that breakpoint | |
2409 | is hit, resume skipping the permanent breakpoint. If | |
2410 | that breakpoint isn't hit, then we've stepped into the | |
2411 | signal handler (or hit some other event). We'll delete | |
2412 | the step-resume breakpoint then. */ | |
2413 | ||
1eb8556f SM |
2414 | infrun_debug_printf ("resume: skipping permanent breakpoint, " |
2415 | "deliver signal first"); | |
af48d08f PA |
2416 | |
2417 | clear_step_over_info (); | |
2418 | tp->control.trap_expected = 0; | |
2419 | ||
2420 | if (tp->control.step_resume_breakpoint == NULL) | |
2421 | { | |
2422 | /* Set a "high-priority" step-resume, as we don't want | |
2423 | user breakpoints at PC to trigger (again) when this | |
2424 | hits. */ | |
2425 | insert_hp_step_resume_breakpoint_at_frame (get_current_frame ()); | |
2426 | gdb_assert (tp->control.step_resume_breakpoint->loc->permanent); | |
2427 | ||
2428 | tp->step_after_step_resume_breakpoint = step; | |
2429 | } | |
2430 | ||
2431 | insert_breakpoints (); | |
2432 | } | |
2433 | else | |
2434 | { | |
2435 | /* There's no signal to pass, we can go ahead and skip the | |
2436 | permanent breakpoint manually. */ | |
1eb8556f | 2437 | infrun_debug_printf ("skipping permanent breakpoint"); |
af48d08f PA |
2438 | gdbarch_skip_permanent_breakpoint (gdbarch, regcache); |
2439 | /* Update pc to reflect the new address from which we will | |
2440 | execute instructions. */ | |
2441 | pc = regcache_read_pc (regcache); | |
2442 | ||
2443 | if (step) | |
2444 | { | |
2445 | /* We've already advanced the PC, so the stepping part | |
2446 | is done. Now we need to arrange for a trap to be | |
2447 | reported to handle_inferior_event. Set a breakpoint | |
2448 | at the current PC, and run to it. Don't update | |
2449 | prev_pc, because if we end in | |
44a1ee51 PA |
2450 | switch_back_to_stepped_thread, we want the "expected |
2451 | thread advanced also" branch to be taken. IOW, we | |
2452 | don't want this thread to step further from PC | |
af48d08f | 2453 | (overstep). */ |
1ac806b8 | 2454 | gdb_assert (!step_over_info_valid_p ()); |
af48d08f PA |
2455 | insert_single_step_breakpoint (gdbarch, aspace, pc); |
2456 | insert_breakpoints (); | |
2457 | ||
fbea99ea | 2458 | resume_ptid = internal_resume_ptid (user_step); |
c4464ade | 2459 | do_target_resume (resume_ptid, false, GDB_SIGNAL_0); |
7846f3aa | 2460 | tp->set_resumed (true); |
af48d08f PA |
2461 | return; |
2462 | } | |
2463 | } | |
6d350bb5 | 2464 | } |
c2c6d25f | 2465 | |
c1e36e3e PA |
2466 | /* If we have a breakpoint to step over, make sure to do a single |
2467 | step only. Same if we have software watchpoints. */ | |
2468 | if (tp->control.trap_expected || bpstat_should_step ()) | |
2469 | tp->control.may_range_step = 0; | |
2470 | ||
7da6a5b9 LM |
2471 | /* If displaced stepping is enabled, step over breakpoints by executing a |
2472 | copy of the instruction at a different address. | |
237fc4c9 PA |
2473 | |
2474 | We can't use displaced stepping when we have a signal to deliver; | |
2475 | the comments for displaced_step_prepare explain why. The | |
2476 | comments in the handle_inferior event for dealing with 'random | |
74609e71 YQ |
2477 | signals' explain what we do instead. |
2478 | ||
2479 | We can't use displaced stepping when we are waiting for vfork_done | |
2480 | event, displaced stepping breaks the vfork child similarly as single | |
2481 | step software breakpoint. */ | |
3fc8eb30 PA |
2482 | if (tp->control.trap_expected |
2483 | && use_displaced_stepping (tp) | |
cb71640d | 2484 | && !step_over_info_valid_p () |
a493e3e2 | 2485 | && sig == GDB_SIGNAL_0 |
6f5d514f | 2486 | && current_inferior ()->thread_waiting_for_vfork_done == nullptr) |
237fc4c9 | 2487 | { |
bab37966 SM |
2488 | displaced_step_prepare_status prepare_status |
2489 | = displaced_step_prepare (tp); | |
fc1cf338 | 2490 | |
bab37966 | 2491 | if (prepare_status == DISPLACED_STEP_PREPARE_STATUS_UNAVAILABLE) |
d56b7306 | 2492 | { |
1eb8556f | 2493 | infrun_debug_printf ("Got placed in step-over queue"); |
4d9d9d04 PA |
2494 | |
2495 | tp->control.trap_expected = 0; | |
d56b7306 VP |
2496 | return; |
2497 | } | |
bab37966 | 2498 | else if (prepare_status == DISPLACED_STEP_PREPARE_STATUS_CANT) |
3fc8eb30 PA |
2499 | { |
2500 | /* Fallback to stepping over the breakpoint in-line. */ | |
2501 | ||
2502 | if (target_is_non_stop_p ()) | |
4f5539f0 | 2503 | stop_all_threads ("displaced stepping falling back on inline stepping"); |
3fc8eb30 | 2504 | |
a01bda52 | 2505 | set_step_over_info (regcache->aspace (), |
21edc42f | 2506 | regcache_read_pc (regcache), 0, tp->global_num); |
3fc8eb30 | 2507 | |
22b11ba9 | 2508 | step = maybe_software_singlestep (gdbarch); |
3fc8eb30 PA |
2509 | |
2510 | insert_breakpoints (); | |
2511 | } | |
bab37966 | 2512 | else if (prepare_status == DISPLACED_STEP_PREPARE_STATUS_OK) |
3fc8eb30 | 2513 | { |
3fc8eb30 PA |
2514 | /* Update pc to reflect the new address from which we will |
2515 | execute instructions due to displaced stepping. */ | |
00431a78 | 2516 | pc = regcache_read_pc (get_thread_regcache (tp)); |
ca7781d2 | 2517 | |
40a53766 | 2518 | step = gdbarch_displaced_step_hw_singlestep (gdbarch); |
3fc8eb30 | 2519 | } |
bab37966 | 2520 | else |
557b4d76 SM |
2521 | gdb_assert_not_reached ("Invalid displaced_step_prepare_status " |
2522 | "value."); | |
237fc4c9 PA |
2523 | } |
2524 | ||
2facfe5c | 2525 | /* Do we need to do it the hard way, w/temp breakpoints? */ |
99e40580 | 2526 | else if (step) |
22b11ba9 | 2527 | step = maybe_software_singlestep (gdbarch); |
c906108c | 2528 | |
30852783 UW |
2529 | /* Currently, our software single-step implementation leads to different |
2530 | results than hardware single-stepping in one situation: when stepping | |
2531 | into delivering a signal which has an associated signal handler, | |
2532 | hardware single-step will stop at the first instruction of the handler, | |
2533 | while software single-step will simply skip execution of the handler. | |
2534 | ||
2535 | For now, this difference in behavior is accepted since there is no | |
2536 | easy way to actually implement single-stepping into a signal handler | |
2537 | without kernel support. | |
2538 | ||
2539 | However, there is one scenario where this difference leads to follow-on | |
2540 | problems: if we're stepping off a breakpoint by removing all breakpoints | |
2541 | and then single-stepping. In this case, the software single-step | |
2542 | behavior means that even if there is a *breakpoint* in the signal | |
2543 | handler, GDB still would not stop. | |
2544 | ||
2545 | Fortunately, we can at least fix this particular issue. We detect | |
2546 | here the case where we are about to deliver a signal while software | |
2547 | single-stepping with breakpoints removed. In this situation, we | |
2548 | revert the decisions to remove all breakpoints and insert single- | |
2549 | step breakpoints, and instead we install a step-resume breakpoint | |
2550 | at the current address, deliver the signal without stepping, and | |
2551 | once we arrive back at the step-resume breakpoint, actually step | |
2552 | over the breakpoint we originally wanted to step over. */ | |
34b7e8a6 | 2553 | if (thread_has_single_step_breakpoints_set (tp) |
6cc83d2a PA |
2554 | && sig != GDB_SIGNAL_0 |
2555 | && step_over_info_valid_p ()) | |
30852783 UW |
2556 | { |
2557 | /* If we have nested signals or a pending signal is delivered | |
7da6a5b9 | 2558 | immediately after a handler returns, might already have |
30852783 UW |
2559 | a step-resume breakpoint set on the earlier handler. We cannot |
2560 | set another step-resume breakpoint; just continue on until the | |
2561 | original breakpoint is hit. */ | |
2562 | if (tp->control.step_resume_breakpoint == NULL) | |
2563 | { | |
2c03e5be | 2564 | insert_hp_step_resume_breakpoint_at_frame (get_current_frame ()); |
30852783 UW |
2565 | tp->step_after_step_resume_breakpoint = 1; |
2566 | } | |
2567 | ||
34b7e8a6 | 2568 | delete_single_step_breakpoints (tp); |
30852783 | 2569 | |
31e77af2 | 2570 | clear_step_over_info (); |
30852783 | 2571 | tp->control.trap_expected = 0; |
31e77af2 PA |
2572 | |
2573 | insert_breakpoints (); | |
30852783 UW |
2574 | } |
2575 | ||
b0f16a3e SM |
2576 | /* If STEP is set, it's a request to use hardware stepping |
2577 | facilities. But in that case, we should never | |
2578 | use singlestep breakpoint. */ | |
34b7e8a6 | 2579 | gdb_assert (!(thread_has_single_step_breakpoints_set (tp) && step)); |
dfcd3bfb | 2580 | |
fbea99ea | 2581 | /* Decide the set of threads to ask the target to resume. */ |
1946c4cc | 2582 | if (tp->control.trap_expected) |
b0f16a3e SM |
2583 | { |
2584 | /* We're allowing a thread to run past a breakpoint it has | |
1946c4cc YQ |
2585 | hit, either by single-stepping the thread with the breakpoint |
2586 | removed, or by displaced stepping, with the breakpoint inserted. | |
2587 | In the former case, we need to single-step only this thread, | |
2588 | and keep others stopped, as they can miss this breakpoint if | |
2589 | allowed to run. That's not really a problem for displaced | |
2590 | stepping, but, we still keep other threads stopped, in case | |
2591 | another thread is also stopped for a breakpoint waiting for | |
2592 | its turn in the displaced stepping queue. */ | |
b0f16a3e SM |
2593 | resume_ptid = inferior_ptid; |
2594 | } | |
fbea99ea PA |
2595 | else |
2596 | resume_ptid = internal_resume_ptid (user_step); | |
d4db2f36 | 2597 | |
7f5ef605 PA |
2598 | if (execution_direction != EXEC_REVERSE |
2599 | && step && breakpoint_inserted_here_p (aspace, pc)) | |
b0f16a3e | 2600 | { |
372316f1 PA |
2601 | /* There are two cases where we currently need to step a |
2602 | breakpoint instruction when we have a signal to deliver: | |
2603 | ||
2604 | - See handle_signal_stop where we handle random signals that | |
2605 | could take out us out of the stepping range. Normally, in | |
2606 | that case we end up continuing (instead of stepping) over the | |
7f5ef605 PA |
2607 | signal handler with a breakpoint at PC, but there are cases |
2608 | where we should _always_ single-step, even if we have a | |
2609 | step-resume breakpoint, like when a software watchpoint is | |
2610 | set. Assuming single-stepping and delivering a signal at the | |
2611 | same time would takes us to the signal handler, then we could | |
2612 | have removed the breakpoint at PC to step over it. However, | |
2613 | some hardware step targets (like e.g., Mac OS) can't step | |
2614 | into signal handlers, and for those, we need to leave the | |
2615 | breakpoint at PC inserted, as otherwise if the handler | |
2616 | recurses and executes PC again, it'll miss the breakpoint. | |
2617 | So we leave the breakpoint inserted anyway, but we need to | |
2618 | record that we tried to step a breakpoint instruction, so | |
372316f1 PA |
2619 | that adjust_pc_after_break doesn't end up confused. |
2620 | ||
dda83cd7 | 2621 | - In non-stop if we insert a breakpoint (e.g., a step-resume) |
372316f1 PA |
2622 | in one thread after another thread that was stepping had been |
2623 | momentarily paused for a step-over. When we re-resume the | |
2624 | stepping thread, it may be resumed from that address with a | |
2625 | breakpoint that hasn't trapped yet. Seen with | |
2626 | gdb.threads/non-stop-fair-events.exp, on targets that don't | |
2627 | do displaced stepping. */ | |
2628 | ||
1eb8556f | 2629 | infrun_debug_printf ("resume: [%s] stepped breakpoint", |
0fab7955 | 2630 | tp->ptid.to_string ().c_str ()); |
7f5ef605 PA |
2631 | |
2632 | tp->stepped_breakpoint = 1; | |
2633 | ||
b0f16a3e SM |
2634 | /* Most targets can step a breakpoint instruction, thus |
2635 | executing it normally. But if this one cannot, just | |
2636 | continue and we will hit it anyway. */ | |
7f5ef605 | 2637 | if (gdbarch_cannot_step_breakpoint (gdbarch)) |
c4464ade | 2638 | step = false; |
b0f16a3e | 2639 | } |
ef5cf84e | 2640 | |
b0f16a3e | 2641 | if (debug_displaced |
cb71640d | 2642 | && tp->control.trap_expected |
3fc8eb30 | 2643 | && use_displaced_stepping (tp) |
cb71640d | 2644 | && !step_over_info_valid_p ()) |
b0f16a3e | 2645 | { |
00431a78 | 2646 | struct regcache *resume_regcache = get_thread_regcache (tp); |
ac7936df | 2647 | struct gdbarch *resume_gdbarch = resume_regcache->arch (); |
b0f16a3e SM |
2648 | CORE_ADDR actual_pc = regcache_read_pc (resume_regcache); |
2649 | gdb_byte buf[4]; | |
2650 | ||
b0f16a3e | 2651 | read_memory (actual_pc, buf, sizeof (buf)); |
136821d9 SM |
2652 | displaced_debug_printf ("run %s: %s", |
2653 | paddress (resume_gdbarch, actual_pc), | |
2654 | displaced_step_dump_bytes | |
2655 | (buf, sizeof (buf)).c_str ()); | |
b0f16a3e | 2656 | } |
237fc4c9 | 2657 | |
b0f16a3e SM |
2658 | if (tp->control.may_range_step) |
2659 | { | |
2660 | /* If we're resuming a thread with the PC out of the step | |
2661 | range, then we're doing some nested/finer run control | |
2662 | operation, like stepping the thread out of the dynamic | |
2663 | linker or the displaced stepping scratch pad. We | |
2664 | shouldn't have allowed a range step then. */ | |
2665 | gdb_assert (pc_in_thread_step_range (pc, tp)); | |
2666 | } | |
c1e36e3e | 2667 | |
64ce06e4 | 2668 | do_target_resume (resume_ptid, step, sig); |
7846f3aa | 2669 | tp->set_resumed (true); |
c906108c | 2670 | } |
71d378ae PA |
2671 | |
2672 | /* Resume the inferior. SIG is the signal to give the inferior | |
2673 | (GDB_SIGNAL_0 for none). This is a wrapper around 'resume_1' that | |
2674 | rolls back state on error. */ | |
2675 | ||
aff4e175 | 2676 | static void |
71d378ae PA |
2677 | resume (gdb_signal sig) |
2678 | { | |
a70b8144 | 2679 | try |
71d378ae PA |
2680 | { |
2681 | resume_1 (sig); | |
2682 | } | |
230d2906 | 2683 | catch (const gdb_exception &ex) |
71d378ae PA |
2684 | { |
2685 | /* If resuming is being aborted for any reason, delete any | |
2686 | single-step breakpoint resume_1 may have created, to avoid | |
2687 | confusing the following resumption, and to avoid leaving | |
2688 | single-step breakpoints perturbing other threads, in case | |
2689 | we're running in non-stop mode. */ | |
2690 | if (inferior_ptid != null_ptid) | |
2691 | delete_single_step_breakpoints (inferior_thread ()); | |
eedc3f4f | 2692 | throw; |
71d378ae | 2693 | } |
71d378ae PA |
2694 | } |
2695 | ||
c906108c | 2696 | \f |
237fc4c9 | 2697 | /* Proceeding. */ |
c906108c | 2698 | |
4c2f2a79 PA |
2699 | /* See infrun.h. */ |
2700 | ||
2701 | /* Counter that tracks number of user visible stops. This can be used | |
2702 | to tell whether a command has proceeded the inferior past the | |
2703 | current location. This allows e.g., inferior function calls in | |
2704 | breakpoint commands to not interrupt the command list. When the | |
2705 | call finishes successfully, the inferior is standing at the same | |
2706 | breakpoint as if nothing happened (and so we don't call | |
2707 | normal_stop). */ | |
2708 | static ULONGEST current_stop_id; | |
2709 | ||
2710 | /* See infrun.h. */ | |
2711 | ||
2712 | ULONGEST | |
2713 | get_stop_id (void) | |
2714 | { | |
2715 | return current_stop_id; | |
2716 | } | |
2717 | ||
2718 | /* Called when we report a user visible stop. */ | |
2719 | ||
2720 | static void | |
2721 | new_stop_id (void) | |
2722 | { | |
2723 | current_stop_id++; | |
2724 | } | |
2725 | ||
c906108c SS |
2726 | /* Clear out all variables saying what to do when inferior is continued. |
2727 | First do this, then set the ones you want, then call `proceed'. */ | |
2728 | ||
a7212384 UW |
2729 | static void |
2730 | clear_proceed_status_thread (struct thread_info *tp) | |
c906108c | 2731 | { |
0fab7955 | 2732 | infrun_debug_printf ("%s", tp->ptid.to_string ().c_str ()); |
d6b48e9c | 2733 | |
372316f1 PA |
2734 | /* If we're starting a new sequence, then the previous finished |
2735 | single-step is no longer relevant. */ | |
1edb66d8 | 2736 | if (tp->has_pending_waitstatus ()) |
372316f1 | 2737 | { |
1edb66d8 | 2738 | if (tp->stop_reason () == TARGET_STOPPED_BY_SINGLE_STEP) |
372316f1 | 2739 | { |
1eb8556f SM |
2740 | infrun_debug_printf ("pending event of %s was a finished step. " |
2741 | "Discarding.", | |
0fab7955 | 2742 | tp->ptid.to_string ().c_str ()); |
372316f1 | 2743 | |
1edb66d8 SM |
2744 | tp->clear_pending_waitstatus (); |
2745 | tp->set_stop_reason (TARGET_STOPPED_BY_NO_REASON); | |
372316f1 | 2746 | } |
1eb8556f | 2747 | else |
372316f1 | 2748 | { |
1eb8556f SM |
2749 | infrun_debug_printf |
2750 | ("thread %s has pending wait status %s (currently_stepping=%d).", | |
0fab7955 | 2751 | tp->ptid.to_string ().c_str (), |
7dca2ea7 | 2752 | tp->pending_waitstatus ().to_string ().c_str (), |
1eb8556f | 2753 | currently_stepping (tp)); |
372316f1 PA |
2754 | } |
2755 | } | |
2756 | ||
70509625 PA |
2757 | /* If this signal should not be seen by program, give it zero. |
2758 | Used for debugging signals. */ | |
1edb66d8 SM |
2759 | if (!signal_pass_state (tp->stop_signal ())) |
2760 | tp->set_stop_signal (GDB_SIGNAL_0); | |
70509625 | 2761 | |
573269a8 | 2762 | tp->release_thread_fsm (); |
243a9253 | 2763 | |
16c381f0 JK |
2764 | tp->control.trap_expected = 0; |
2765 | tp->control.step_range_start = 0; | |
2766 | tp->control.step_range_end = 0; | |
c1e36e3e | 2767 | tp->control.may_range_step = 0; |
16c381f0 JK |
2768 | tp->control.step_frame_id = null_frame_id; |
2769 | tp->control.step_stack_frame_id = null_frame_id; | |
2770 | tp->control.step_over_calls = STEP_OVER_UNDEBUGGABLE; | |
885eeb5b | 2771 | tp->control.step_start_function = NULL; |
a7212384 | 2772 | tp->stop_requested = 0; |
4e1c45ea | 2773 | |
16c381f0 | 2774 | tp->control.stop_step = 0; |
32400beb | 2775 | |
16c381f0 | 2776 | tp->control.proceed_to_finish = 0; |
414c69f7 | 2777 | |
856e7dd6 | 2778 | tp->control.stepping_command = 0; |
17b2616c | 2779 | |
a7212384 | 2780 | /* Discard any remaining commands or status from previous stop. */ |
16c381f0 | 2781 | bpstat_clear (&tp->control.stop_bpstat); |
a7212384 | 2782 | } |
32400beb | 2783 | |
a7212384 | 2784 | void |
70509625 | 2785 | clear_proceed_status (int step) |
a7212384 | 2786 | { |
f2665db5 MM |
2787 | /* With scheduler-locking replay, stop replaying other threads if we're |
2788 | not replaying the user-visible resume ptid. | |
2789 | ||
2790 | This is a convenience feature to not require the user to explicitly | |
2791 | stop replaying the other threads. We're assuming that the user's | |
2792 | intent is to resume tracing the recorded process. */ | |
2793 | if (!non_stop && scheduler_mode == schedlock_replay | |
2794 | && target_record_is_replaying (minus_one_ptid) | |
2795 | && !target_record_will_replay (user_visible_resume_ptid (step), | |
2796 | execution_direction)) | |
2797 | target_record_stop_replaying (); | |
2798 | ||
08036331 | 2799 | if (!non_stop && inferior_ptid != null_ptid) |
6c95b8df | 2800 | { |
08036331 | 2801 | ptid_t resume_ptid = user_visible_resume_ptid (step); |
5b6d1e4f PA |
2802 | process_stratum_target *resume_target |
2803 | = user_visible_resume_target (resume_ptid); | |
70509625 PA |
2804 | |
2805 | /* In all-stop mode, delete the per-thread status of all threads | |
2806 | we're about to resume, implicitly and explicitly. */ | |
5b6d1e4f | 2807 | for (thread_info *tp : all_non_exited_threads (resume_target, resume_ptid)) |
08036331 | 2808 | clear_proceed_status_thread (tp); |
6c95b8df PA |
2809 | } |
2810 | ||
d7e15655 | 2811 | if (inferior_ptid != null_ptid) |
a7212384 UW |
2812 | { |
2813 | struct inferior *inferior; | |
2814 | ||
2815 | if (non_stop) | |
2816 | { | |
6c95b8df PA |
2817 | /* If in non-stop mode, only delete the per-thread status of |
2818 | the current thread. */ | |
a7212384 UW |
2819 | clear_proceed_status_thread (inferior_thread ()); |
2820 | } | |
6c95b8df | 2821 | |
d6b48e9c | 2822 | inferior = current_inferior (); |
16c381f0 | 2823 | inferior->control.stop_soon = NO_STOP_QUIETLY; |
4e1c45ea PA |
2824 | } |
2825 | ||
76727919 | 2826 | gdb::observers::about_to_proceed.notify (); |
c906108c SS |
2827 | } |
2828 | ||
99619bea PA |
2829 | /* Returns true if TP is still stopped at a breakpoint that needs |
2830 | stepping-over in order to make progress. If the breakpoint is gone | |
2831 | meanwhile, we can skip the whole step-over dance. */ | |
ea67f13b | 2832 | |
c4464ade | 2833 | static bool |
6c4cfb24 | 2834 | thread_still_needs_step_over_bp (struct thread_info *tp) |
99619bea PA |
2835 | { |
2836 | if (tp->stepping_over_breakpoint) | |
2837 | { | |
00431a78 | 2838 | struct regcache *regcache = get_thread_regcache (tp); |
99619bea | 2839 | |
a01bda52 | 2840 | if (breakpoint_here_p (regcache->aspace (), |
af48d08f PA |
2841 | regcache_read_pc (regcache)) |
2842 | == ordinary_breakpoint_here) | |
c4464ade | 2843 | return true; |
99619bea PA |
2844 | |
2845 | tp->stepping_over_breakpoint = 0; | |
2846 | } | |
2847 | ||
c4464ade | 2848 | return false; |
99619bea PA |
2849 | } |
2850 | ||
6c4cfb24 PA |
2851 | /* Check whether thread TP still needs to start a step-over in order |
2852 | to make progress when resumed. Returns an bitwise or of enum | |
2853 | step_over_what bits, indicating what needs to be stepped over. */ | |
2854 | ||
8d297bbf | 2855 | static step_over_what |
6c4cfb24 PA |
2856 | thread_still_needs_step_over (struct thread_info *tp) |
2857 | { | |
8d297bbf | 2858 | step_over_what what = 0; |
6c4cfb24 PA |
2859 | |
2860 | if (thread_still_needs_step_over_bp (tp)) | |
2861 | what |= STEP_OVER_BREAKPOINT; | |
2862 | ||
2863 | if (tp->stepping_over_watchpoint | |
9aed480c | 2864 | && !target_have_steppable_watchpoint ()) |
6c4cfb24 PA |
2865 | what |= STEP_OVER_WATCHPOINT; |
2866 | ||
2867 | return what; | |
2868 | } | |
2869 | ||
483805cf PA |
2870 | /* Returns true if scheduler locking applies. STEP indicates whether |
2871 | we're about to do a step/next-like command to a thread. */ | |
2872 | ||
c4464ade | 2873 | static bool |
856e7dd6 | 2874 | schedlock_applies (struct thread_info *tp) |
483805cf PA |
2875 | { |
2876 | return (scheduler_mode == schedlock_on | |
2877 | || (scheduler_mode == schedlock_step | |
f2665db5 MM |
2878 | && tp->control.stepping_command) |
2879 | || (scheduler_mode == schedlock_replay | |
2880 | && target_record_will_replay (minus_one_ptid, | |
2881 | execution_direction))); | |
483805cf PA |
2882 | } |
2883 | ||
1192f124 SM |
2884 | /* Set process_stratum_target::COMMIT_RESUMED_STATE in all target |
2885 | stacks that have threads executing and don't have threads with | |
2886 | pending events. */ | |
5b6d1e4f PA |
2887 | |
2888 | static void | |
1192f124 SM |
2889 | maybe_set_commit_resumed_all_targets () |
2890 | { | |
b4b1a226 SM |
2891 | scoped_restore_current_thread restore_thread; |
2892 | ||
1192f124 SM |
2893 | for (inferior *inf : all_non_exited_inferiors ()) |
2894 | { | |
2895 | process_stratum_target *proc_target = inf->process_target (); | |
2896 | ||
2897 | if (proc_target->commit_resumed_state) | |
2898 | { | |
2899 | /* We already set this in a previous iteration, via another | |
2900 | inferior sharing the process_stratum target. */ | |
2901 | continue; | |
2902 | } | |
2903 | ||
2904 | /* If the target has no resumed threads, it would be useless to | |
2905 | ask it to commit the resumed threads. */ | |
2906 | if (!proc_target->threads_executing) | |
2907 | { | |
2908 | infrun_debug_printf ("not requesting commit-resumed for target " | |
2909 | "%s, no resumed threads", | |
2910 | proc_target->shortname ()); | |
2911 | continue; | |
2912 | } | |
2913 | ||
2914 | /* As an optimization, if a thread from this target has some | |
2915 | status to report, handle it before requiring the target to | |
2916 | commit its resumed threads: handling the status might lead to | |
2917 | resuming more threads. */ | |
273dadf2 | 2918 | if (proc_target->has_resumed_with_pending_wait_status ()) |
1192f124 SM |
2919 | { |
2920 | infrun_debug_printf ("not requesting commit-resumed for target %s, a" | |
2921 | " thread has a pending waitstatus", | |
2922 | proc_target->shortname ()); | |
2923 | continue; | |
2924 | } | |
2925 | ||
b4b1a226 SM |
2926 | switch_to_inferior_no_thread (inf); |
2927 | ||
2928 | if (target_has_pending_events ()) | |
2929 | { | |
2930 | infrun_debug_printf ("not requesting commit-resumed for target %s, " | |
2931 | "target has pending events", | |
2932 | proc_target->shortname ()); | |
2933 | continue; | |
2934 | } | |
2935 | ||
1192f124 SM |
2936 | infrun_debug_printf ("enabling commit-resumed for target %s", |
2937 | proc_target->shortname ()); | |
2938 | ||
2939 | proc_target->commit_resumed_state = true; | |
2940 | } | |
2941 | } | |
2942 | ||
2943 | /* See infrun.h. */ | |
2944 | ||
2945 | void | |
2946 | maybe_call_commit_resumed_all_targets () | |
5b6d1e4f PA |
2947 | { |
2948 | scoped_restore_current_thread restore_thread; | |
2949 | ||
1192f124 SM |
2950 | for (inferior *inf : all_non_exited_inferiors ()) |
2951 | { | |
2952 | process_stratum_target *proc_target = inf->process_target (); | |
2953 | ||
2954 | if (!proc_target->commit_resumed_state) | |
2955 | continue; | |
2956 | ||
2957 | switch_to_inferior_no_thread (inf); | |
2958 | ||
2959 | infrun_debug_printf ("calling commit_resumed for target %s", | |
2960 | proc_target->shortname()); | |
2961 | ||
2962 | target_commit_resumed (); | |
2963 | } | |
2964 | } | |
2965 | ||
2966 | /* To track nesting of scoped_disable_commit_resumed objects, ensuring | |
2967 | that only the outermost one attempts to re-enable | |
2968 | commit-resumed. */ | |
2969 | static bool enable_commit_resumed = true; | |
2970 | ||
2971 | /* See infrun.h. */ | |
2972 | ||
2973 | scoped_disable_commit_resumed::scoped_disable_commit_resumed | |
2974 | (const char *reason) | |
2975 | : m_reason (reason), | |
2976 | m_prev_enable_commit_resumed (enable_commit_resumed) | |
2977 | { | |
2978 | infrun_debug_printf ("reason=%s", m_reason); | |
2979 | ||
2980 | enable_commit_resumed = false; | |
5b6d1e4f PA |
2981 | |
2982 | for (inferior *inf : all_non_exited_inferiors ()) | |
1192f124 SM |
2983 | { |
2984 | process_stratum_target *proc_target = inf->process_target (); | |
5b6d1e4f | 2985 | |
1192f124 SM |
2986 | if (m_prev_enable_commit_resumed) |
2987 | { | |
2988 | /* This is the outermost instance: force all | |
2989 | COMMIT_RESUMED_STATE to false. */ | |
2990 | proc_target->commit_resumed_state = false; | |
2991 | } | |
2992 | else | |
2993 | { | |
2994 | /* This is not the outermost instance, we expect | |
2995 | COMMIT_RESUMED_STATE to have been cleared by the | |
2996 | outermost instance. */ | |
2997 | gdb_assert (!proc_target->commit_resumed_state); | |
2998 | } | |
2999 | } | |
3000 | } | |
3001 | ||
3002 | /* See infrun.h. */ | |
3003 | ||
3004 | void | |
3005 | scoped_disable_commit_resumed::reset () | |
3006 | { | |
3007 | if (m_reset) | |
3008 | return; | |
3009 | m_reset = true; | |
3010 | ||
3011 | infrun_debug_printf ("reason=%s", m_reason); | |
3012 | ||
3013 | gdb_assert (!enable_commit_resumed); | |
3014 | ||
3015 | enable_commit_resumed = m_prev_enable_commit_resumed; | |
3016 | ||
3017 | if (m_prev_enable_commit_resumed) | |
5b6d1e4f | 3018 | { |
1192f124 SM |
3019 | /* This is the outermost instance, re-enable |
3020 | COMMIT_RESUMED_STATE on the targets where it's possible. */ | |
3021 | maybe_set_commit_resumed_all_targets (); | |
3022 | } | |
3023 | else | |
3024 | { | |
3025 | /* This is not the outermost instance, we expect | |
3026 | COMMIT_RESUMED_STATE to still be false. */ | |
3027 | for (inferior *inf : all_non_exited_inferiors ()) | |
3028 | { | |
3029 | process_stratum_target *proc_target = inf->process_target (); | |
3030 | gdb_assert (!proc_target->commit_resumed_state); | |
3031 | } | |
3032 | } | |
3033 | } | |
3034 | ||
3035 | /* See infrun.h. */ | |
3036 | ||
3037 | scoped_disable_commit_resumed::~scoped_disable_commit_resumed () | |
3038 | { | |
3039 | reset (); | |
3040 | } | |
3041 | ||
3042 | /* See infrun.h. */ | |
3043 | ||
3044 | void | |
3045 | scoped_disable_commit_resumed::reset_and_commit () | |
3046 | { | |
3047 | reset (); | |
3048 | maybe_call_commit_resumed_all_targets (); | |
3049 | } | |
3050 | ||
3051 | /* See infrun.h. */ | |
3052 | ||
3053 | scoped_enable_commit_resumed::scoped_enable_commit_resumed | |
3054 | (const char *reason) | |
3055 | : m_reason (reason), | |
3056 | m_prev_enable_commit_resumed (enable_commit_resumed) | |
3057 | { | |
3058 | infrun_debug_printf ("reason=%s", m_reason); | |
3059 | ||
3060 | if (!enable_commit_resumed) | |
3061 | { | |
3062 | enable_commit_resumed = true; | |
3063 | ||
3064 | /* Re-enable COMMIT_RESUMED_STATE on the targets where it's | |
3065 | possible. */ | |
3066 | maybe_set_commit_resumed_all_targets (); | |
3067 | ||
3068 | maybe_call_commit_resumed_all_targets (); | |
3069 | } | |
3070 | } | |
3071 | ||
3072 | /* See infrun.h. */ | |
3073 | ||
3074 | scoped_enable_commit_resumed::~scoped_enable_commit_resumed () | |
3075 | { | |
3076 | infrun_debug_printf ("reason=%s", m_reason); | |
3077 | ||
3078 | gdb_assert (enable_commit_resumed); | |
3079 | ||
3080 | enable_commit_resumed = m_prev_enable_commit_resumed; | |
3081 | ||
3082 | if (!enable_commit_resumed) | |
3083 | { | |
3084 | /* Force all COMMIT_RESUMED_STATE back to false. */ | |
3085 | for (inferior *inf : all_non_exited_inferiors ()) | |
3086 | { | |
3087 | process_stratum_target *proc_target = inf->process_target (); | |
3088 | proc_target->commit_resumed_state = false; | |
3089 | } | |
5b6d1e4f PA |
3090 | } |
3091 | } | |
3092 | ||
2f4fcf00 PA |
3093 | /* Check that all the targets we're about to resume are in non-stop |
3094 | mode. Ideally, we'd only care whether all targets support | |
3095 | target-async, but we're not there yet. E.g., stop_all_threads | |
3096 | doesn't know how to handle all-stop targets. Also, the remote | |
3097 | protocol in all-stop mode is synchronous, irrespective of | |
3098 | target-async, which means that things like a breakpoint re-set | |
3099 | triggered by one target would try to read memory from all targets | |
3100 | and fail. */ | |
3101 | ||
3102 | static void | |
3103 | check_multi_target_resumption (process_stratum_target *resume_target) | |
3104 | { | |
3105 | if (!non_stop && resume_target == nullptr) | |
3106 | { | |
3107 | scoped_restore_current_thread restore_thread; | |
3108 | ||
3109 | /* This is used to track whether we're resuming more than one | |
3110 | target. */ | |
3111 | process_stratum_target *first_connection = nullptr; | |
3112 | ||
3113 | /* The first inferior we see with a target that does not work in | |
3114 | always-non-stop mode. */ | |
3115 | inferior *first_not_non_stop = nullptr; | |
3116 | ||
f058c521 | 3117 | for (inferior *inf : all_non_exited_inferiors ()) |
2f4fcf00 PA |
3118 | { |
3119 | switch_to_inferior_no_thread (inf); | |
3120 | ||
55f6301a | 3121 | if (!target_has_execution ()) |
2f4fcf00 PA |
3122 | continue; |
3123 | ||
3124 | process_stratum_target *proc_target | |
3125 | = current_inferior ()->process_target(); | |
3126 | ||
3127 | if (!target_is_non_stop_p ()) | |
3128 | first_not_non_stop = inf; | |
3129 | ||
3130 | if (first_connection == nullptr) | |
3131 | first_connection = proc_target; | |
3132 | else if (first_connection != proc_target | |
3133 | && first_not_non_stop != nullptr) | |
3134 | { | |
3135 | switch_to_inferior_no_thread (first_not_non_stop); | |
3136 | ||
3137 | proc_target = current_inferior ()->process_target(); | |
3138 | ||
3139 | error (_("Connection %d (%s) does not support " | |
3140 | "multi-target resumption."), | |
3141 | proc_target->connection_number, | |
3142 | make_target_connection_string (proc_target).c_str ()); | |
3143 | } | |
3144 | } | |
3145 | } | |
3146 | } | |
3147 | ||
c906108c SS |
3148 | /* Basic routine for continuing the program in various fashions. |
3149 | ||
3150 | ADDR is the address to resume at, or -1 for resume where stopped. | |
aff4e175 AB |
3151 | SIGGNAL is the signal to give it, or GDB_SIGNAL_0 for none, |
3152 | or GDB_SIGNAL_DEFAULT for act according to how it stopped. | |
c906108c SS |
3153 | |
3154 | You should call clear_proceed_status before calling proceed. */ | |
3155 | ||
3156 | void | |
64ce06e4 | 3157 | proceed (CORE_ADDR addr, enum gdb_signal siggnal) |
c906108c | 3158 | { |
3ec3145c SM |
3159 | INFRUN_SCOPED_DEBUG_ENTER_EXIT; |
3160 | ||
e58b0e63 PA |
3161 | struct regcache *regcache; |
3162 | struct gdbarch *gdbarch; | |
e58b0e63 | 3163 | CORE_ADDR pc; |
4d9d9d04 PA |
3164 | struct execution_control_state ecss; |
3165 | struct execution_control_state *ecs = &ecss; | |
c906108c | 3166 | |
e58b0e63 PA |
3167 | /* If we're stopped at a fork/vfork, follow the branch set by the |
3168 | "set follow-fork-mode" command; otherwise, we'll just proceed | |
3169 | resuming the current thread. */ | |
3170 | if (!follow_fork ()) | |
3171 | { | |
3172 | /* The target for some reason decided not to resume. */ | |
3173 | normal_stop (); | |
f148b27e | 3174 | if (target_can_async_p ()) |
b1a35af2 | 3175 | inferior_event_handler (INF_EXEC_COMPLETE); |
e58b0e63 PA |
3176 | return; |
3177 | } | |
3178 | ||
842951eb PA |
3179 | /* We'll update this if & when we switch to a new thread. */ |
3180 | previous_inferior_ptid = inferior_ptid; | |
3181 | ||
e58b0e63 | 3182 | regcache = get_current_regcache (); |
ac7936df | 3183 | gdbarch = regcache->arch (); |
8b86c959 YQ |
3184 | const address_space *aspace = regcache->aspace (); |
3185 | ||
fc75c28b TBA |
3186 | pc = regcache_read_pc_protected (regcache); |
3187 | ||
08036331 | 3188 | thread_info *cur_thr = inferior_thread (); |
e58b0e63 | 3189 | |
99619bea | 3190 | /* Fill in with reasonable starting values. */ |
08036331 | 3191 | init_thread_stepping_state (cur_thr); |
99619bea | 3192 | |
08036331 | 3193 | gdb_assert (!thread_is_in_step_over_chain (cur_thr)); |
c2829269 | 3194 | |
5b6d1e4f PA |
3195 | ptid_t resume_ptid |
3196 | = user_visible_resume_ptid (cur_thr->control.stepping_command); | |
3197 | process_stratum_target *resume_target | |
3198 | = user_visible_resume_target (resume_ptid); | |
3199 | ||
2f4fcf00 PA |
3200 | check_multi_target_resumption (resume_target); |
3201 | ||
2acceee2 | 3202 | if (addr == (CORE_ADDR) -1) |
c906108c | 3203 | { |
351031f2 AB |
3204 | if (cur_thr->stop_pc_p () |
3205 | && pc == cur_thr->stop_pc () | |
af48d08f | 3206 | && breakpoint_here_p (aspace, pc) == ordinary_breakpoint_here |
b2175913 | 3207 | && execution_direction != EXEC_REVERSE) |
3352ef37 AC |
3208 | /* There is a breakpoint at the address we will resume at, |
3209 | step one instruction before inserting breakpoints so that | |
3210 | we do not stop right away (and report a second hit at this | |
b2175913 MS |
3211 | breakpoint). |
3212 | ||
3213 | Note, we don't do this in reverse, because we won't | |
3214 | actually be executing the breakpoint insn anyway. | |
3215 | We'll be (un-)executing the previous instruction. */ | |
08036331 | 3216 | cur_thr->stepping_over_breakpoint = 1; |
515630c5 UW |
3217 | else if (gdbarch_single_step_through_delay_p (gdbarch) |
3218 | && gdbarch_single_step_through_delay (gdbarch, | |
3219 | get_current_frame ())) | |
3352ef37 AC |
3220 | /* We stepped onto an instruction that needs to be stepped |
3221 | again before re-inserting the breakpoint, do so. */ | |
08036331 | 3222 | cur_thr->stepping_over_breakpoint = 1; |
c906108c SS |
3223 | } |
3224 | else | |
3225 | { | |
515630c5 | 3226 | regcache_write_pc (regcache, addr); |
c906108c SS |
3227 | } |
3228 | ||
70509625 | 3229 | if (siggnal != GDB_SIGNAL_DEFAULT) |
1edb66d8 | 3230 | cur_thr->set_stop_signal (siggnal); |
70509625 | 3231 | |
4d9d9d04 PA |
3232 | /* If an exception is thrown from this point on, make sure to |
3233 | propagate GDB's knowledge of the executing state to the | |
3234 | frontend/user running state. */ | |
5b6d1e4f | 3235 | scoped_finish_thread_state finish_state (resume_target, resume_ptid); |
4d9d9d04 PA |
3236 | |
3237 | /* Even if RESUME_PTID is a wildcard, and we end up resuming fewer | |
3238 | threads (e.g., we might need to set threads stepping over | |
3239 | breakpoints first), from the user/frontend's point of view, all | |
3240 | threads in RESUME_PTID are now running. Unless we're calling an | |
3241 | inferior function, as in that case we pretend the inferior | |
3242 | doesn't run at all. */ | |
08036331 | 3243 | if (!cur_thr->control.in_infcall) |
719546c4 | 3244 | set_running (resume_target, resume_ptid, true); |
17b2616c | 3245 | |
1eb8556f SM |
3246 | infrun_debug_printf ("addr=%s, signal=%s", paddress (gdbarch, addr), |
3247 | gdb_signal_to_symbol_string (siggnal)); | |
527159b7 | 3248 | |
4d9d9d04 PA |
3249 | annotate_starting (); |
3250 | ||
3251 | /* Make sure that output from GDB appears before output from the | |
3252 | inferior. */ | |
3253 | gdb_flush (gdb_stdout); | |
3254 | ||
d930703d PA |
3255 | /* Since we've marked the inferior running, give it the terminal. A |
3256 | QUIT/Ctrl-C from here on is forwarded to the target (which can | |
3257 | still detect attempts to unblock a stuck connection with repeated | |
3258 | Ctrl-C from within target_pass_ctrlc). */ | |
3259 | target_terminal::inferior (); | |
3260 | ||
4d9d9d04 PA |
3261 | /* In a multi-threaded task we may select another thread and |
3262 | then continue or step. | |
3263 | ||
3264 | But if a thread that we're resuming had stopped at a breakpoint, | |
3265 | it will immediately cause another breakpoint stop without any | |
3266 | execution (i.e. it will report a breakpoint hit incorrectly). So | |
3267 | we must step over it first. | |
3268 | ||
3269 | Look for threads other than the current (TP) that reported a | |
3270 | breakpoint hit and haven't been resumed yet since. */ | |
3271 | ||
3272 | /* If scheduler locking applies, we can avoid iterating over all | |
3273 | threads. */ | |
08036331 | 3274 | if (!non_stop && !schedlock_applies (cur_thr)) |
94cc34af | 3275 | { |
5b6d1e4f PA |
3276 | for (thread_info *tp : all_non_exited_threads (resume_target, |
3277 | resume_ptid)) | |
08036331 | 3278 | { |
f3f8ece4 PA |
3279 | switch_to_thread_no_regs (tp); |
3280 | ||
4d9d9d04 PA |
3281 | /* Ignore the current thread here. It's handled |
3282 | afterwards. */ | |
08036331 | 3283 | if (tp == cur_thr) |
4d9d9d04 | 3284 | continue; |
c906108c | 3285 | |
4d9d9d04 PA |
3286 | if (!thread_still_needs_step_over (tp)) |
3287 | continue; | |
3288 | ||
3289 | gdb_assert (!thread_is_in_step_over_chain (tp)); | |
c906108c | 3290 | |
1eb8556f | 3291 | infrun_debug_printf ("need to step-over [%s] first", |
0fab7955 | 3292 | tp->ptid.to_string ().c_str ()); |
99619bea | 3293 | |
28d5518b | 3294 | global_thread_step_over_chain_enqueue (tp); |
2adfaa28 | 3295 | } |
f3f8ece4 PA |
3296 | |
3297 | switch_to_thread (cur_thr); | |
30852783 UW |
3298 | } |
3299 | ||
4d9d9d04 PA |
3300 | /* Enqueue the current thread last, so that we move all other |
3301 | threads over their breakpoints first. */ | |
08036331 | 3302 | if (cur_thr->stepping_over_breakpoint) |
28d5518b | 3303 | global_thread_step_over_chain_enqueue (cur_thr); |
30852783 | 3304 | |
4d9d9d04 PA |
3305 | /* If the thread isn't started, we'll still need to set its prev_pc, |
3306 | so that switch_back_to_stepped_thread knows the thread hasn't | |
3307 | advanced. Must do this before resuming any thread, as in | |
3308 | all-stop/remote, once we resume we can't send any other packet | |
3309 | until the target stops again. */ | |
fc75c28b | 3310 | cur_thr->prev_pc = regcache_read_pc_protected (regcache); |
99619bea | 3311 | |
a9bc57b9 | 3312 | { |
1192f124 | 3313 | scoped_disable_commit_resumed disable_commit_resumed ("proceeding"); |
8bf10e2e | 3314 | bool step_over_started = start_step_over (); |
c906108c | 3315 | |
a9bc57b9 TT |
3316 | if (step_over_info_valid_p ()) |
3317 | { | |
3318 | /* Either this thread started a new in-line step over, or some | |
3319 | other thread was already doing one. In either case, don't | |
3320 | resume anything else until the step-over is finished. */ | |
3321 | } | |
8bf10e2e | 3322 | else if (step_over_started && !target_is_non_stop_p ()) |
a9bc57b9 TT |
3323 | { |
3324 | /* A new displaced stepping sequence was started. In all-stop, | |
3325 | we can't talk to the target anymore until it next stops. */ | |
3326 | } | |
3327 | else if (!non_stop && target_is_non_stop_p ()) | |
3328 | { | |
3ec3145c SM |
3329 | INFRUN_SCOPED_DEBUG_START_END |
3330 | ("resuming threads, all-stop-on-top-of-non-stop"); | |
3331 | ||
a9bc57b9 TT |
3332 | /* In all-stop, but the target is always in non-stop mode. |
3333 | Start all other threads that are implicitly resumed too. */ | |
5b6d1e4f PA |
3334 | for (thread_info *tp : all_non_exited_threads (resume_target, |
3335 | resume_ptid)) | |
3336 | { | |
3337 | switch_to_thread_no_regs (tp); | |
3338 | ||
f9fac3c8 SM |
3339 | if (!tp->inf->has_execution ()) |
3340 | { | |
1eb8556f | 3341 | infrun_debug_printf ("[%s] target has no execution", |
0fab7955 | 3342 | tp->ptid.to_string ().c_str ()); |
f9fac3c8 SM |
3343 | continue; |
3344 | } | |
f3f8ece4 | 3345 | |
7846f3aa | 3346 | if (tp->resumed ()) |
f9fac3c8 | 3347 | { |
1eb8556f | 3348 | infrun_debug_printf ("[%s] resumed", |
0fab7955 | 3349 | tp->ptid.to_string ().c_str ()); |
611841bb | 3350 | gdb_assert (tp->executing () || tp->has_pending_waitstatus ()); |
f9fac3c8 SM |
3351 | continue; |
3352 | } | |
fbea99ea | 3353 | |
f9fac3c8 SM |
3354 | if (thread_is_in_step_over_chain (tp)) |
3355 | { | |
1eb8556f | 3356 | infrun_debug_printf ("[%s] needs step-over", |
0fab7955 | 3357 | tp->ptid.to_string ().c_str ()); |
f9fac3c8 SM |
3358 | continue; |
3359 | } | |
fbea99ea | 3360 | |
d8bbae6e SM |
3361 | /* If a thread of that inferior is waiting for a vfork-done |
3362 | (for a detached vfork child to exec or exit), breakpoints are | |
3363 | removed. We must not resume any thread of that inferior, other | |
3364 | than the one waiting for the vfork-done. */ | |
3365 | if (tp->inf->thread_waiting_for_vfork_done != nullptr | |
3366 | && tp != tp->inf->thread_waiting_for_vfork_done) | |
3367 | { | |
3368 | infrun_debug_printf ("[%s] another thread of this inferior is " | |
3369 | "waiting for vfork-done", | |
3370 | tp->ptid.to_string ().c_str ()); | |
3371 | continue; | |
3372 | } | |
3373 | ||
1eb8556f | 3374 | infrun_debug_printf ("resuming %s", |
0fab7955 | 3375 | tp->ptid.to_string ().c_str ()); |
fbea99ea | 3376 | |
f9fac3c8 SM |
3377 | reset_ecs (ecs, tp); |
3378 | switch_to_thread (tp); | |
3379 | keep_going_pass_signal (ecs); | |
3380 | if (!ecs->wait_some_more) | |
3381 | error (_("Command aborted.")); | |
3382 | } | |
a9bc57b9 | 3383 | } |
d8bbae6e SM |
3384 | else if (!cur_thr->resumed () |
3385 | && !thread_is_in_step_over_chain (cur_thr) | |
3386 | /* In non-stop, forbid resuming a thread if some other thread of | |
3387 | that inferior is waiting for a vfork-done event (this means | |
3388 | breakpoints are out for this inferior). */ | |
3389 | && !(non_stop | |
3390 | && cur_thr->inf->thread_waiting_for_vfork_done != nullptr)) | |
a9bc57b9 TT |
3391 | { |
3392 | /* The thread wasn't started, and isn't queued, run it now. */ | |
08036331 PA |
3393 | reset_ecs (ecs, cur_thr); |
3394 | switch_to_thread (cur_thr); | |
a9bc57b9 TT |
3395 | keep_going_pass_signal (ecs); |
3396 | if (!ecs->wait_some_more) | |
3397 | error (_("Command aborted.")); | |
3398 | } | |
c906108c | 3399 | |
1192f124 SM |
3400 | disable_commit_resumed.reset_and_commit (); |
3401 | } | |
85ad3aaf | 3402 | |
731f534f | 3403 | finish_state.release (); |
c906108c | 3404 | |
873657b9 PA |
3405 | /* If we've switched threads above, switch back to the previously |
3406 | current thread. We don't want the user to see a different | |
3407 | selected thread. */ | |
3408 | switch_to_thread (cur_thr); | |
3409 | ||
0b333c5e PA |
3410 | /* Tell the event loop to wait for it to stop. If the target |
3411 | supports asynchronous execution, it'll do this from within | |
3412 | target_resume. */ | |
362646f5 | 3413 | if (!target_can_async_p ()) |
0b333c5e | 3414 | mark_async_event_handler (infrun_async_inferior_event_token); |
c906108c | 3415 | } |
c906108c SS |
3416 | \f |
3417 | ||
3418 | /* Start remote-debugging of a machine over a serial link. */ | |
96baa820 | 3419 | |
c906108c | 3420 | void |
8621d6a9 | 3421 | start_remote (int from_tty) |
c906108c | 3422 | { |
5b6d1e4f PA |
3423 | inferior *inf = current_inferior (); |
3424 | inf->control.stop_soon = STOP_QUIETLY_REMOTE; | |
43ff13b4 | 3425 | |
1777feb0 | 3426 | /* Always go on waiting for the target, regardless of the mode. */ |
6426a772 | 3427 | /* FIXME: cagney/1999-09-23: At present it isn't possible to |
7e73cedf | 3428 | indicate to wait_for_inferior that a target should timeout if |
6426a772 JM |
3429 | nothing is returned (instead of just blocking). Because of this, |
3430 | targets expecting an immediate response need to, internally, set | |
3431 | things up so that the target_wait() is forced to eventually | |
1777feb0 | 3432 | timeout. */ |
6426a772 JM |
3433 | /* FIXME: cagney/1999-09-24: It isn't possible for target_open() to |
3434 | differentiate to its caller what the state of the target is after | |
3435 | the initial open has been performed. Here we're assuming that | |
3436 | the target has stopped. It should be possible to eventually have | |
3437 | target_open() return to the caller an indication that the target | |
3438 | is currently running and GDB state should be set to the same as | |
1777feb0 | 3439 | for an async run. */ |
5b6d1e4f | 3440 | wait_for_inferior (inf); |
8621d6a9 DJ |
3441 | |
3442 | /* Now that the inferior has stopped, do any bookkeeping like | |
3443 | loading shared libraries. We want to do this before normal_stop, | |
3444 | so that the displayed frame is up to date. */ | |
a7aba266 | 3445 | post_create_inferior (from_tty); |
8621d6a9 | 3446 | |
6426a772 | 3447 | normal_stop (); |
c906108c SS |
3448 | } |
3449 | ||
3450 | /* Initialize static vars when a new inferior begins. */ | |
3451 | ||
3452 | void | |
96baa820 | 3453 | init_wait_for_inferior (void) |
c906108c SS |
3454 | { |
3455 | /* These are meaningless until the first time through wait_for_inferior. */ | |
c906108c | 3456 | |
c906108c SS |
3457 | breakpoint_init_inferior (inf_starting); |
3458 | ||
70509625 | 3459 | clear_proceed_status (0); |
9f976b41 | 3460 | |
ab1ddbcf | 3461 | nullify_last_target_wait_ptid (); |
237fc4c9 | 3462 | |
842951eb | 3463 | previous_inferior_ptid = inferior_ptid; |
c906108c | 3464 | } |
237fc4c9 | 3465 | |
c906108c | 3466 | \f |
488f131b | 3467 | |
ec9499be | 3468 | static void handle_inferior_event (struct execution_control_state *ecs); |
cd0fc7c3 | 3469 | |
568d6575 UW |
3470 | static void handle_step_into_function (struct gdbarch *gdbarch, |
3471 | struct execution_control_state *ecs); | |
3472 | static void handle_step_into_function_backward (struct gdbarch *gdbarch, | |
3473 | struct execution_control_state *ecs); | |
4f5d7f63 | 3474 | static void handle_signal_stop (struct execution_control_state *ecs); |
186c406b | 3475 | static void check_exception_resume (struct execution_control_state *, |
bd2b40ac | 3476 | frame_info_ptr ); |
611c83ae | 3477 | |
bdc36728 | 3478 | static void end_stepping_range (struct execution_control_state *ecs); |
22bcd14b | 3479 | static void stop_waiting (struct execution_control_state *ecs); |
d4f3574e | 3480 | static void keep_going (struct execution_control_state *ecs); |
94c57d6a | 3481 | static void process_event_stop_test (struct execution_control_state *ecs); |
c4464ade | 3482 | static bool switch_back_to_stepped_thread (struct execution_control_state *ecs); |
104c1213 | 3483 | |
252fbfc8 PA |
3484 | /* This function is attached as a "thread_stop_requested" observer. |
3485 | Cleanup local state that assumed the PTID was to be resumed, and | |
3486 | report the stop to the frontend. */ | |
3487 | ||
2c0b251b | 3488 | static void |
252fbfc8 PA |
3489 | infrun_thread_stop_requested (ptid_t ptid) |
3490 | { | |
5b6d1e4f PA |
3491 | process_stratum_target *curr_target = current_inferior ()->process_target (); |
3492 | ||
c65d6b55 PA |
3493 | /* PTID was requested to stop. If the thread was already stopped, |
3494 | but the user/frontend doesn't know about that yet (e.g., the | |
3495 | thread had been temporarily paused for some step-over), set up | |
3496 | for reporting the stop now. */ | |
5b6d1e4f | 3497 | for (thread_info *tp : all_threads (curr_target, ptid)) |
08036331 PA |
3498 | { |
3499 | if (tp->state != THREAD_RUNNING) | |
3500 | continue; | |
611841bb | 3501 | if (tp->executing ()) |
08036331 | 3502 | continue; |
c65d6b55 | 3503 | |
08036331 PA |
3504 | /* Remove matching threads from the step-over queue, so |
3505 | start_step_over doesn't try to resume them | |
3506 | automatically. */ | |
3507 | if (thread_is_in_step_over_chain (tp)) | |
28d5518b | 3508 | global_thread_step_over_chain_remove (tp); |
c65d6b55 | 3509 | |
08036331 PA |
3510 | /* If the thread is stopped, but the user/frontend doesn't |
3511 | know about that yet, queue a pending event, as if the | |
3512 | thread had just stopped now. Unless the thread already had | |
3513 | a pending event. */ | |
1edb66d8 | 3514 | if (!tp->has_pending_waitstatus ()) |
08036331 | 3515 | { |
1edb66d8 | 3516 | target_waitstatus ws; |
183be222 | 3517 | ws.set_stopped (GDB_SIGNAL_0); |
1edb66d8 | 3518 | tp->set_pending_waitstatus (ws); |
08036331 | 3519 | } |
c65d6b55 | 3520 | |
08036331 PA |
3521 | /* Clear the inline-frame state, since we're re-processing the |
3522 | stop. */ | |
5b6d1e4f | 3523 | clear_inline_frame_state (tp); |
c65d6b55 | 3524 | |
08036331 PA |
3525 | /* If this thread was paused because some other thread was |
3526 | doing an inline-step over, let that finish first. Once | |
3527 | that happens, we'll restart all threads and consume pending | |
3528 | stop events then. */ | |
3529 | if (step_over_info_valid_p ()) | |
3530 | continue; | |
3531 | ||
3532 | /* Otherwise we can process the (new) pending event now. Set | |
3533 | it so this pending event is considered by | |
3534 | do_target_wait. */ | |
7846f3aa | 3535 | tp->set_resumed (true); |
08036331 | 3536 | } |
252fbfc8 PA |
3537 | } |
3538 | ||
a07daef3 PA |
3539 | static void |
3540 | infrun_thread_thread_exit (struct thread_info *tp, int silent) | |
3541 | { | |
5b6d1e4f PA |
3542 | if (target_last_proc_target == tp->inf->process_target () |
3543 | && target_last_wait_ptid == tp->ptid) | |
a07daef3 PA |
3544 | nullify_last_target_wait_ptid (); |
3545 | } | |
3546 | ||
0cbcdb96 PA |
3547 | /* Delete the step resume, single-step and longjmp/exception resume |
3548 | breakpoints of TP. */ | |
4e1c45ea | 3549 | |
0cbcdb96 PA |
3550 | static void |
3551 | delete_thread_infrun_breakpoints (struct thread_info *tp) | |
4e1c45ea | 3552 | { |
0cbcdb96 PA |
3553 | delete_step_resume_breakpoint (tp); |
3554 | delete_exception_resume_breakpoint (tp); | |
34b7e8a6 | 3555 | delete_single_step_breakpoints (tp); |
4e1c45ea PA |
3556 | } |
3557 | ||
0cbcdb96 PA |
3558 | /* If the target still has execution, call FUNC for each thread that |
3559 | just stopped. In all-stop, that's all the non-exited threads; in | |
3560 | non-stop, that's the current thread, only. */ | |
3561 | ||
3562 | typedef void (*for_each_just_stopped_thread_callback_func) | |
3563 | (struct thread_info *tp); | |
4e1c45ea PA |
3564 | |
3565 | static void | |
0cbcdb96 | 3566 | for_each_just_stopped_thread (for_each_just_stopped_thread_callback_func func) |
4e1c45ea | 3567 | { |
55f6301a | 3568 | if (!target_has_execution () || inferior_ptid == null_ptid) |
4e1c45ea PA |
3569 | return; |
3570 | ||
fbea99ea | 3571 | if (target_is_non_stop_p ()) |
4e1c45ea | 3572 | { |
0cbcdb96 PA |
3573 | /* If in non-stop mode, only the current thread stopped. */ |
3574 | func (inferior_thread ()); | |
4e1c45ea PA |
3575 | } |
3576 | else | |
0cbcdb96 | 3577 | { |
0cbcdb96 | 3578 | /* In all-stop mode, all threads have stopped. */ |
08036331 PA |
3579 | for (thread_info *tp : all_non_exited_threads ()) |
3580 | func (tp); | |
0cbcdb96 PA |
3581 | } |
3582 | } | |
3583 | ||
3584 | /* Delete the step resume and longjmp/exception resume breakpoints of | |
3585 | the threads that just stopped. */ | |
3586 | ||
3587 | static void | |
3588 | delete_just_stopped_threads_infrun_breakpoints (void) | |
3589 | { | |
3590 | for_each_just_stopped_thread (delete_thread_infrun_breakpoints); | |
34b7e8a6 PA |
3591 | } |
3592 | ||
3593 | /* Delete the single-step breakpoints of the threads that just | |
3594 | stopped. */ | |
7c16b83e | 3595 | |
34b7e8a6 PA |
3596 | static void |
3597 | delete_just_stopped_threads_single_step_breakpoints (void) | |
3598 | { | |
3599 | for_each_just_stopped_thread (delete_single_step_breakpoints); | |
4e1c45ea PA |
3600 | } |
3601 | ||
221e1a37 | 3602 | /* See infrun.h. */ |
223698f8 | 3603 | |
221e1a37 | 3604 | void |
223698f8 | 3605 | print_target_wait_results (ptid_t waiton_ptid, ptid_t result_ptid, |
c272a98c | 3606 | const struct target_waitstatus &ws) |
223698f8 | 3607 | { |
17e971f7 SM |
3608 | infrun_debug_printf ("target_wait (%s [%s], status) =", |
3609 | waiton_ptid.to_string ().c_str (), | |
e71daf80 | 3610 | target_pid_to_str (waiton_ptid).c_str ()); |
17e971f7 SM |
3611 | infrun_debug_printf (" %s [%s],", |
3612 | result_ptid.to_string ().c_str (), | |
e71daf80 | 3613 | target_pid_to_str (result_ptid).c_str ()); |
c272a98c | 3614 | infrun_debug_printf (" %s", ws.to_string ().c_str ()); |
223698f8 DE |
3615 | } |
3616 | ||
372316f1 PA |
3617 | /* Select a thread at random, out of those which are resumed and have |
3618 | had events. */ | |
3619 | ||
3620 | static struct thread_info * | |
5b6d1e4f | 3621 | random_pending_event_thread (inferior *inf, ptid_t waiton_ptid) |
372316f1 | 3622 | { |
71a23490 SM |
3623 | process_stratum_target *proc_target = inf->process_target (); |
3624 | thread_info *thread | |
3625 | = proc_target->random_resumed_with_pending_wait_status (inf, waiton_ptid); | |
08036331 | 3626 | |
71a23490 | 3627 | if (thread == nullptr) |
08036331 | 3628 | { |
71a23490 SM |
3629 | infrun_debug_printf ("None found."); |
3630 | return nullptr; | |
3631 | } | |
372316f1 | 3632 | |
0fab7955 | 3633 | infrun_debug_printf ("Found %s.", thread->ptid.to_string ().c_str ()); |
71a23490 SM |
3634 | gdb_assert (thread->resumed ()); |
3635 | gdb_assert (thread->has_pending_waitstatus ()); | |
372316f1 | 3636 | |
71a23490 | 3637 | return thread; |
372316f1 PA |
3638 | } |
3639 | ||
3640 | /* Wrapper for target_wait that first checks whether threads have | |
3641 | pending statuses to report before actually asking the target for | |
5b6d1e4f PA |
3642 | more events. INF is the inferior we're using to call target_wait |
3643 | on. */ | |
372316f1 PA |
3644 | |
3645 | static ptid_t | |
5b6d1e4f | 3646 | do_target_wait_1 (inferior *inf, ptid_t ptid, |
b60cea74 | 3647 | target_waitstatus *status, target_wait_flags options) |
372316f1 | 3648 | { |
372316f1 PA |
3649 | struct thread_info *tp; |
3650 | ||
24ed6739 AB |
3651 | /* We know that we are looking for an event in the target of inferior |
3652 | INF, but we don't know which thread the event might come from. As | |
3653 | such we want to make sure that INFERIOR_PTID is reset so that none of | |
3654 | the wait code relies on it - doing so is always a mistake. */ | |
3655 | switch_to_inferior_no_thread (inf); | |
3656 | ||
372316f1 PA |
3657 | /* First check if there is a resumed thread with a wait status |
3658 | pending. */ | |
d7e15655 | 3659 | if (ptid == minus_one_ptid || ptid.is_pid ()) |
372316f1 | 3660 | { |
5b6d1e4f | 3661 | tp = random_pending_event_thread (inf, ptid); |
372316f1 PA |
3662 | } |
3663 | else | |
3664 | { | |
1eb8556f | 3665 | infrun_debug_printf ("Waiting for specific thread %s.", |
0fab7955 | 3666 | ptid.to_string ().c_str ()); |
372316f1 PA |
3667 | |
3668 | /* We have a specific thread to check. */ | |
5b6d1e4f | 3669 | tp = find_thread_ptid (inf, ptid); |
372316f1 | 3670 | gdb_assert (tp != NULL); |
1edb66d8 | 3671 | if (!tp->has_pending_waitstatus ()) |
372316f1 PA |
3672 | tp = NULL; |
3673 | } | |
3674 | ||
3675 | if (tp != NULL | |
1edb66d8 SM |
3676 | && (tp->stop_reason () == TARGET_STOPPED_BY_SW_BREAKPOINT |
3677 | || tp->stop_reason () == TARGET_STOPPED_BY_HW_BREAKPOINT)) | |
372316f1 | 3678 | { |
00431a78 | 3679 | struct regcache *regcache = get_thread_regcache (tp); |
ac7936df | 3680 | struct gdbarch *gdbarch = regcache->arch (); |
372316f1 PA |
3681 | CORE_ADDR pc; |
3682 | int discard = 0; | |
3683 | ||
3684 | pc = regcache_read_pc (regcache); | |
3685 | ||
1edb66d8 | 3686 | if (pc != tp->stop_pc ()) |
372316f1 | 3687 | { |
1eb8556f | 3688 | infrun_debug_printf ("PC of %s changed. was=%s, now=%s", |
0fab7955 | 3689 | tp->ptid.to_string ().c_str (), |
1edb66d8 | 3690 | paddress (gdbarch, tp->stop_pc ()), |
1eb8556f | 3691 | paddress (gdbarch, pc)); |
372316f1 PA |
3692 | discard = 1; |
3693 | } | |
a01bda52 | 3694 | else if (!breakpoint_inserted_here_p (regcache->aspace (), pc)) |
372316f1 | 3695 | { |
1eb8556f | 3696 | infrun_debug_printf ("previous breakpoint of %s, at %s gone", |
0fab7955 | 3697 | tp->ptid.to_string ().c_str (), |
1eb8556f | 3698 | paddress (gdbarch, pc)); |
372316f1 PA |
3699 | |
3700 | discard = 1; | |
3701 | } | |
3702 | ||
3703 | if (discard) | |
3704 | { | |
1eb8556f | 3705 | infrun_debug_printf ("pending event of %s cancelled.", |
0fab7955 | 3706 | tp->ptid.to_string ().c_str ()); |
372316f1 | 3707 | |
1edb66d8 SM |
3708 | tp->clear_pending_waitstatus (); |
3709 | target_waitstatus ws; | |
183be222 | 3710 | ws.set_spurious (); |
1edb66d8 SM |
3711 | tp->set_pending_waitstatus (ws); |
3712 | tp->set_stop_reason (TARGET_STOPPED_BY_NO_REASON); | |
372316f1 PA |
3713 | } |
3714 | } | |
3715 | ||
3716 | if (tp != NULL) | |
3717 | { | |
1eb8556f | 3718 | infrun_debug_printf ("Using pending wait status %s for %s.", |
7dca2ea7 | 3719 | tp->pending_waitstatus ().to_string ().c_str (), |
0fab7955 | 3720 | tp->ptid.to_string ().c_str ()); |
372316f1 PA |
3721 | |
3722 | /* Now that we've selected our final event LWP, un-adjust its PC | |
3723 | if it was a software breakpoint (and the target doesn't | |
3724 | always adjust the PC itself). */ | |
1edb66d8 | 3725 | if (tp->stop_reason () == TARGET_STOPPED_BY_SW_BREAKPOINT |
372316f1 PA |
3726 | && !target_supports_stopped_by_sw_breakpoint ()) |
3727 | { | |
3728 | struct regcache *regcache; | |
3729 | struct gdbarch *gdbarch; | |
3730 | int decr_pc; | |
3731 | ||
00431a78 | 3732 | regcache = get_thread_regcache (tp); |
ac7936df | 3733 | gdbarch = regcache->arch (); |
372316f1 PA |
3734 | |
3735 | decr_pc = gdbarch_decr_pc_after_break (gdbarch); | |
3736 | if (decr_pc != 0) | |
3737 | { | |
3738 | CORE_ADDR pc; | |
3739 | ||
3740 | pc = regcache_read_pc (regcache); | |
3741 | regcache_write_pc (regcache, pc + decr_pc); | |
3742 | } | |
3743 | } | |
3744 | ||
1edb66d8 SM |
3745 | tp->set_stop_reason (TARGET_STOPPED_BY_NO_REASON); |
3746 | *status = tp->pending_waitstatus (); | |
3747 | tp->clear_pending_waitstatus (); | |
372316f1 PA |
3748 | |
3749 | /* Wake up the event loop again, until all pending events are | |
3750 | processed. */ | |
3751 | if (target_is_async_p ()) | |
3752 | mark_async_event_handler (infrun_async_inferior_event_token); | |
3753 | return tp->ptid; | |
3754 | } | |
3755 | ||
3756 | /* But if we don't find one, we'll have to wait. */ | |
3757 | ||
d3a07122 SM |
3758 | /* We can't ask a non-async target to do a non-blocking wait, so this will be |
3759 | a blocking wait. */ | |
71247709 | 3760 | if (!target_can_async_p ()) |
d3a07122 SM |
3761 | options &= ~TARGET_WNOHANG; |
3762 | ||
fb85cece | 3763 | return target_wait (ptid, status, options); |
372316f1 PA |
3764 | } |
3765 | ||
5b6d1e4f PA |
3766 | /* Wrapper for target_wait that first checks whether threads have |
3767 | pending statuses to report before actually asking the target for | |
b3e3a4c1 | 3768 | more events. Polls for events from all inferiors/targets. */ |
5b6d1e4f PA |
3769 | |
3770 | static bool | |
ac0d67ed | 3771 | do_target_wait (execution_control_state *ecs, target_wait_flags options) |
5b6d1e4f PA |
3772 | { |
3773 | int num_inferiors = 0; | |
3774 | int random_selector; | |
3775 | ||
b3e3a4c1 SM |
3776 | /* For fairness, we pick the first inferior/target to poll at random |
3777 | out of all inferiors that may report events, and then continue | |
3778 | polling the rest of the inferior list starting from that one in a | |
3779 | circular fashion until the whole list is polled once. */ | |
5b6d1e4f | 3780 | |
ac0d67ed | 3781 | auto inferior_matches = [] (inferior *inf) |
5b6d1e4f | 3782 | { |
ac0d67ed | 3783 | return inf->process_target () != nullptr; |
5b6d1e4f PA |
3784 | }; |
3785 | ||
b3e3a4c1 | 3786 | /* First see how many matching inferiors we have. */ |
5b6d1e4f PA |
3787 | for (inferior *inf : all_inferiors ()) |
3788 | if (inferior_matches (inf)) | |
3789 | num_inferiors++; | |
3790 | ||
3791 | if (num_inferiors == 0) | |
3792 | { | |
183be222 | 3793 | ecs->ws.set_ignore (); |
5b6d1e4f PA |
3794 | return false; |
3795 | } | |
3796 | ||
b3e3a4c1 | 3797 | /* Now randomly pick an inferior out of those that matched. */ |
5b6d1e4f PA |
3798 | random_selector = (int) |
3799 | ((num_inferiors * (double) rand ()) / (RAND_MAX + 1.0)); | |
3800 | ||
1eb8556f SM |
3801 | if (num_inferiors > 1) |
3802 | infrun_debug_printf ("Found %d inferiors, starting at #%d", | |
3803 | num_inferiors, random_selector); | |
5b6d1e4f | 3804 | |
b3e3a4c1 | 3805 | /* Select the Nth inferior that matched. */ |
5b6d1e4f PA |
3806 | |
3807 | inferior *selected = nullptr; | |
3808 | ||
3809 | for (inferior *inf : all_inferiors ()) | |
3810 | if (inferior_matches (inf)) | |
3811 | if (random_selector-- == 0) | |
3812 | { | |
3813 | selected = inf; | |
3814 | break; | |
3815 | } | |
3816 | ||
b3e3a4c1 | 3817 | /* Now poll for events out of each of the matching inferior's |
5b6d1e4f PA |
3818 | targets, starting from the selected one. */ |
3819 | ||
3820 | auto do_wait = [&] (inferior *inf) | |
3821 | { | |
ac0d67ed | 3822 | ecs->ptid = do_target_wait_1 (inf, minus_one_ptid, &ecs->ws, options); |
5b6d1e4f | 3823 | ecs->target = inf->process_target (); |
183be222 | 3824 | return (ecs->ws.kind () != TARGET_WAITKIND_IGNORE); |
5b6d1e4f PA |
3825 | }; |
3826 | ||
b3e3a4c1 SM |
3827 | /* Needed in 'all-stop + target-non-stop' mode, because we end up |
3828 | here spuriously after the target is all stopped and we've already | |
5b6d1e4f PA |
3829 | reported the stop to the user, polling for events. */ |
3830 | scoped_restore_current_thread restore_thread; | |
3831 | ||
08bdefb5 PA |
3832 | intrusive_list_iterator<inferior> start |
3833 | = inferior_list.iterator_to (*selected); | |
3834 | ||
3835 | for (intrusive_list_iterator<inferior> it = start; | |
3836 | it != inferior_list.end (); | |
3837 | ++it) | |
3838 | { | |
3839 | inferior *inf = &*it; | |
3840 | ||
3841 | if (inferior_matches (inf) && do_wait (inf)) | |
5b6d1e4f | 3842 | return true; |
08bdefb5 | 3843 | } |
5b6d1e4f | 3844 | |
08bdefb5 PA |
3845 | for (intrusive_list_iterator<inferior> it = inferior_list.begin (); |
3846 | it != start; | |
3847 | ++it) | |
3848 | { | |
3849 | inferior *inf = &*it; | |
3850 | ||
3851 | if (inferior_matches (inf) && do_wait (inf)) | |
5b6d1e4f | 3852 | return true; |
08bdefb5 | 3853 | } |
5b6d1e4f | 3854 | |
183be222 | 3855 | ecs->ws.set_ignore (); |
5b6d1e4f PA |
3856 | return false; |
3857 | } | |
3858 | ||
8ff53139 PA |
3859 | /* An event reported by wait_one. */ |
3860 | ||
3861 | struct wait_one_event | |
3862 | { | |
3863 | /* The target the event came out of. */ | |
3864 | process_stratum_target *target; | |
3865 | ||
3866 | /* The PTID the event was for. */ | |
3867 | ptid_t ptid; | |
3868 | ||
3869 | /* The waitstatus. */ | |
3870 | target_waitstatus ws; | |
3871 | }; | |
3872 | ||
3873 | static bool handle_one (const wait_one_event &event); | |
3874 | ||
24291992 PA |
3875 | /* Prepare and stabilize the inferior for detaching it. E.g., |
3876 | detaching while a thread is displaced stepping is a recipe for | |
3877 | crashing it, as nothing would readjust the PC out of the scratch | |
3878 | pad. */ | |
3879 | ||
3880 | void | |
3881 | prepare_for_detach (void) | |
3882 | { | |
3883 | struct inferior *inf = current_inferior (); | |
f2907e49 | 3884 | ptid_t pid_ptid = ptid_t (inf->pid); |
8ff53139 | 3885 | scoped_restore_current_thread restore_thread; |
24291992 | 3886 | |
9bcb1f16 | 3887 | scoped_restore restore_detaching = make_scoped_restore (&inf->detaching, true); |
24291992 | 3888 | |
8ff53139 PA |
3889 | /* Remove all threads of INF from the global step-over chain. We |
3890 | want to stop any ongoing step-over, not start any new one. */ | |
8b6a69b2 SM |
3891 | thread_step_over_list_safe_range range |
3892 | = make_thread_step_over_list_safe_range (global_thread_step_over_list); | |
3893 | ||
3894 | for (thread_info *tp : range) | |
3895 | if (tp->inf == inf) | |
3896 | { | |
3897 | infrun_debug_printf ("removing thread %s from global step over chain", | |
0fab7955 | 3898 | tp->ptid.to_string ().c_str ()); |
8ff53139 | 3899 | global_thread_step_over_chain_remove (tp); |
8b6a69b2 | 3900 | } |
24291992 | 3901 | |
ac7d717c PA |
3902 | /* If we were already in the middle of an inline step-over, and the |
3903 | thread stepping belongs to the inferior we're detaching, we need | |
3904 | to restart the threads of other inferiors. */ | |
3905 | if (step_over_info.thread != -1) | |
3906 | { | |
3907 | infrun_debug_printf ("inline step-over in-process while detaching"); | |
3908 | ||
3909 | thread_info *thr = find_thread_global_id (step_over_info.thread); | |
3910 | if (thr->inf == inf) | |
3911 | { | |
3912 | /* Since we removed threads of INF from the step-over chain, | |
3913 | we know this won't start a step-over for INF. */ | |
3914 | clear_step_over_info (); | |
3915 | ||
3916 | if (target_is_non_stop_p ()) | |
3917 | { | |
3918 | /* Start a new step-over in another thread if there's | |
3919 | one that needs it. */ | |
3920 | start_step_over (); | |
3921 | ||
3922 | /* Restart all other threads (except the | |
3923 | previously-stepping thread, since that one is still | |
3924 | running). */ | |
3925 | if (!step_over_info_valid_p ()) | |
3926 | restart_threads (thr); | |
3927 | } | |
3928 | } | |
3929 | } | |
3930 | ||
8ff53139 PA |
3931 | if (displaced_step_in_progress (inf)) |
3932 | { | |
3933 | infrun_debug_printf ("displaced-stepping in-process while detaching"); | |
24291992 | 3934 | |
8ff53139 | 3935 | /* Stop threads currently displaced stepping, aborting it. */ |
24291992 | 3936 | |
8ff53139 PA |
3937 | for (thread_info *thr : inf->non_exited_threads ()) |
3938 | { | |
3939 | if (thr->displaced_step_state.in_progress ()) | |
3940 | { | |
611841bb | 3941 | if (thr->executing ()) |
8ff53139 PA |
3942 | { |
3943 | if (!thr->stop_requested) | |
3944 | { | |
3945 | target_stop (thr->ptid); | |
3946 | thr->stop_requested = true; | |
3947 | } | |
3948 | } | |
3949 | else | |
7846f3aa | 3950 | thr->set_resumed (false); |
8ff53139 PA |
3951 | } |
3952 | } | |
24291992 | 3953 | |
8ff53139 PA |
3954 | while (displaced_step_in_progress (inf)) |
3955 | { | |
3956 | wait_one_event event; | |
24291992 | 3957 | |
8ff53139 PA |
3958 | event.target = inf->process_target (); |
3959 | event.ptid = do_target_wait_1 (inf, pid_ptid, &event.ws, 0); | |
24291992 | 3960 | |
8ff53139 | 3961 | if (debug_infrun) |
c272a98c | 3962 | print_target_wait_results (pid_ptid, event.ptid, event.ws); |
24291992 | 3963 | |
8ff53139 PA |
3964 | handle_one (event); |
3965 | } | |
24291992 | 3966 | |
8ff53139 PA |
3967 | /* It's OK to leave some of the threads of INF stopped, since |
3968 | they'll be detached shortly. */ | |
24291992 | 3969 | } |
24291992 PA |
3970 | } |
3971 | ||
e0c01ce6 PA |
3972 | /* If all-stop, but there exists a non-stop target, stop all threads |
3973 | now that we're presenting the stop to the user. */ | |
3974 | ||
3975 | static void | |
3976 | stop_all_threads_if_all_stop_mode () | |
3977 | { | |
3978 | if (!non_stop && exists_non_stop_target ()) | |
3979 | stop_all_threads ("presenting stop to user in all-stop"); | |
3980 | } | |
3981 | ||
cd0fc7c3 | 3982 | /* Wait for control to return from inferior to debugger. |
ae123ec6 | 3983 | |
cd0fc7c3 SS |
3984 | If inferior gets a signal, we may decide to start it up again |
3985 | instead of returning. That is why there is a loop in this function. | |
3986 | When this function actually returns it means the inferior | |
3987 | should be left stopped and GDB should read more commands. */ | |
3988 | ||
5b6d1e4f PA |
3989 | static void |
3990 | wait_for_inferior (inferior *inf) | |
cd0fc7c3 | 3991 | { |
1eb8556f | 3992 | infrun_debug_printf ("wait_for_inferior ()"); |
527159b7 | 3993 | |
4c41382a | 3994 | SCOPE_EXIT { delete_just_stopped_threads_infrun_breakpoints (); }; |
cd0fc7c3 | 3995 | |
e6f5c25b PA |
3996 | /* If an error happens while handling the event, propagate GDB's |
3997 | knowledge of the executing state to the frontend/user running | |
3998 | state. */ | |
5b6d1e4f PA |
3999 | scoped_finish_thread_state finish_state |
4000 | (inf->process_target (), minus_one_ptid); | |
e6f5c25b | 4001 | |
c906108c SS |
4002 | while (1) |
4003 | { | |
ae25568b PA |
4004 | struct execution_control_state ecss; |
4005 | struct execution_control_state *ecs = &ecss; | |
29f49a6a | 4006 | |
ec9499be | 4007 | overlay_cache_invalid = 1; |
ec9499be | 4008 | |
f15cb84a YQ |
4009 | /* Flush target cache before starting to handle each event. |
4010 | Target was running and cache could be stale. This is just a | |
4011 | heuristic. Running threads may modify target memory, but we | |
4012 | don't get any event. */ | |
4013 | target_dcache_invalidate (); | |
4014 | ||
5b6d1e4f PA |
4015 | ecs->ptid = do_target_wait_1 (inf, minus_one_ptid, &ecs->ws, 0); |
4016 | ecs->target = inf->process_target (); | |
c906108c | 4017 | |
f00150c9 | 4018 | if (debug_infrun) |
c272a98c | 4019 | print_target_wait_results (minus_one_ptid, ecs->ptid, ecs->ws); |
f00150c9 | 4020 | |
cd0fc7c3 SS |
4021 | /* Now figure out what to do with the result of the result. */ |
4022 | handle_inferior_event (ecs); | |
c906108c | 4023 | |
cd0fc7c3 SS |
4024 | if (!ecs->wait_some_more) |
4025 | break; | |
4026 | } | |
4e1c45ea | 4027 | |
e0c01ce6 PA |
4028 | stop_all_threads_if_all_stop_mode (); |
4029 | ||
e6f5c25b | 4030 | /* No error, don't finish the state yet. */ |
731f534f | 4031 | finish_state.release (); |
cd0fc7c3 | 4032 | } |
c906108c | 4033 | |
d3d4baed PA |
4034 | /* Cleanup that reinstalls the readline callback handler, if the |
4035 | target is running in the background. If while handling the target | |
4036 | event something triggered a secondary prompt, like e.g., a | |
4037 | pagination prompt, we'll have removed the callback handler (see | |
4038 | gdb_readline_wrapper_line). Need to do this as we go back to the | |
4039 | event loop, ready to process further input. Note this has no | |
4040 | effect if the handler hasn't actually been removed, because calling | |
4041 | rl_callback_handler_install resets the line buffer, thus losing | |
4042 | input. */ | |
4043 | ||
4044 | static void | |
d238133d | 4045 | reinstall_readline_callback_handler_cleanup () |
d3d4baed | 4046 | { |
3b12939d PA |
4047 | struct ui *ui = current_ui; |
4048 | ||
4049 | if (!ui->async) | |
6c400b59 PA |
4050 | { |
4051 | /* We're not going back to the top level event loop yet. Don't | |
4052 | install the readline callback, as it'd prep the terminal, | |
4053 | readline-style (raw, noecho) (e.g., --batch). We'll install | |
4054 | it the next time the prompt is displayed, when we're ready | |
4055 | for input. */ | |
4056 | return; | |
4057 | } | |
4058 | ||
3b12939d | 4059 | if (ui->command_editing && ui->prompt_state != PROMPT_BLOCKED) |
d3d4baed PA |
4060 | gdb_rl_callback_handler_reinstall (); |
4061 | } | |
4062 | ||
243a9253 PA |
4063 | /* Clean up the FSMs of threads that are now stopped. In non-stop, |
4064 | that's just the event thread. In all-stop, that's all threads. */ | |
4065 | ||
4066 | static void | |
4067 | clean_up_just_stopped_threads_fsms (struct execution_control_state *ecs) | |
4068 | { | |
22517040 SM |
4069 | /* The first clean_up call below assumes the event thread is the current |
4070 | one. */ | |
4071 | if (ecs->event_thread != nullptr) | |
4072 | gdb_assert (ecs->event_thread == inferior_thread ()); | |
4073 | ||
573269a8 LS |
4074 | if (ecs->event_thread != nullptr |
4075 | && ecs->event_thread->thread_fsm () != nullptr) | |
4076 | ecs->event_thread->thread_fsm ()->clean_up (ecs->event_thread); | |
243a9253 PA |
4077 | |
4078 | if (!non_stop) | |
4079 | { | |
22517040 SM |
4080 | scoped_restore_current_thread restore_thread; |
4081 | ||
08036331 | 4082 | for (thread_info *thr : all_non_exited_threads ()) |
dda83cd7 | 4083 | { |
573269a8 | 4084 | if (thr->thread_fsm () == nullptr) |
243a9253 PA |
4085 | continue; |
4086 | if (thr == ecs->event_thread) | |
4087 | continue; | |
4088 | ||
00431a78 | 4089 | switch_to_thread (thr); |
573269a8 | 4090 | thr->thread_fsm ()->clean_up (thr); |
243a9253 | 4091 | } |
243a9253 PA |
4092 | } |
4093 | } | |
4094 | ||
3b12939d PA |
4095 | /* Helper for all_uis_check_sync_execution_done that works on the |
4096 | current UI. */ | |
4097 | ||
4098 | static void | |
4099 | check_curr_ui_sync_execution_done (void) | |
4100 | { | |
4101 | struct ui *ui = current_ui; | |
4102 | ||
4103 | if (ui->prompt_state == PROMPT_NEEDED | |
4104 | && ui->async | |
4105 | && !gdb_in_secondary_prompt_p (ui)) | |
4106 | { | |
223ffa71 | 4107 | target_terminal::ours (); |
76727919 | 4108 | gdb::observers::sync_execution_done.notify (); |
8f7f9b3a | 4109 | ui->register_file_handler (); |
3b12939d PA |
4110 | } |
4111 | } | |
4112 | ||
4113 | /* See infrun.h. */ | |
4114 | ||
4115 | void | |
4116 | all_uis_check_sync_execution_done (void) | |
4117 | { | |
0e454242 | 4118 | SWITCH_THRU_ALL_UIS () |
3b12939d PA |
4119 | { |
4120 | check_curr_ui_sync_execution_done (); | |
4121 | } | |
4122 | } | |
4123 | ||
a8836c93 PA |
4124 | /* See infrun.h. */ |
4125 | ||
4126 | void | |
4127 | all_uis_on_sync_execution_starting (void) | |
4128 | { | |
0e454242 | 4129 | SWITCH_THRU_ALL_UIS () |
a8836c93 PA |
4130 | { |
4131 | if (current_ui->prompt_state == PROMPT_NEEDED) | |
4132 | async_disable_stdin (); | |
4133 | } | |
4134 | } | |
4135 | ||
1777feb0 | 4136 | /* Asynchronous version of wait_for_inferior. It is called by the |
43ff13b4 | 4137 | event loop whenever a change of state is detected on the file |
1777feb0 MS |
4138 | descriptor corresponding to the target. It can be called more than |
4139 | once to complete a single execution command. In such cases we need | |
4140 | to keep the state in a global variable ECSS. If it is the last time | |
a474d7c2 PA |
4141 | that this function is called for a single execution command, then |
4142 | report to the user that the inferior has stopped, and do the | |
1777feb0 | 4143 | necessary cleanups. */ |
43ff13b4 JM |
4144 | |
4145 | void | |
b1a35af2 | 4146 | fetch_inferior_event () |
43ff13b4 | 4147 | { |
3ec3145c SM |
4148 | INFRUN_SCOPED_DEBUG_ENTER_EXIT; |
4149 | ||
0d1e5fa7 | 4150 | struct execution_control_state ecss; |
a474d7c2 | 4151 | struct execution_control_state *ecs = &ecss; |
0f641c01 | 4152 | int cmd_done = 0; |
43ff13b4 | 4153 | |
c61db772 PA |
4154 | /* Events are always processed with the main UI as current UI. This |
4155 | way, warnings, debug output, etc. are always consistently sent to | |
4156 | the main console. */ | |
4b6749b9 | 4157 | scoped_restore save_ui = make_scoped_restore (¤t_ui, main_ui); |
c61db772 | 4158 | |
b78b3a29 TBA |
4159 | /* Temporarily disable pagination. Otherwise, the user would be |
4160 | given an option to press 'q' to quit, which would cause an early | |
4161 | exit and could leave GDB in a half-baked state. */ | |
4162 | scoped_restore save_pagination | |
4163 | = make_scoped_restore (&pagination_enabled, false); | |
4164 | ||
d3d4baed | 4165 | /* End up with readline processing input, if necessary. */ |
d238133d TT |
4166 | { |
4167 | SCOPE_EXIT { reinstall_readline_callback_handler_cleanup (); }; | |
4168 | ||
4169 | /* We're handling a live event, so make sure we're doing live | |
4170 | debugging. If we're looking at traceframes while the target is | |
4171 | running, we're going to need to get back to that mode after | |
4172 | handling the event. */ | |
4173 | gdb::optional<scoped_restore_current_traceframe> maybe_restore_traceframe; | |
4174 | if (non_stop) | |
4175 | { | |
4176 | maybe_restore_traceframe.emplace (); | |
4177 | set_current_traceframe (-1); | |
4178 | } | |
43ff13b4 | 4179 | |
873657b9 PA |
4180 | /* The user/frontend should not notice a thread switch due to |
4181 | internal events. Make sure we revert to the user selected | |
4182 | thread and frame after handling the event and running any | |
4183 | breakpoint commands. */ | |
4184 | scoped_restore_current_thread restore_thread; | |
d238133d TT |
4185 | |
4186 | overlay_cache_invalid = 1; | |
4187 | /* Flush target cache before starting to handle each event. Target | |
4188 | was running and cache could be stale. This is just a heuristic. | |
4189 | Running threads may modify target memory, but we don't get any | |
4190 | event. */ | |
4191 | target_dcache_invalidate (); | |
4192 | ||
4193 | scoped_restore save_exec_dir | |
4194 | = make_scoped_restore (&execution_direction, | |
4195 | target_execution_direction ()); | |
4196 | ||
1192f124 SM |
4197 | /* Allow targets to pause their resumed threads while we handle |
4198 | the event. */ | |
4199 | scoped_disable_commit_resumed disable_commit_resumed ("handling event"); | |
4200 | ||
ac0d67ed | 4201 | if (!do_target_wait (ecs, TARGET_WNOHANG)) |
1192f124 SM |
4202 | { |
4203 | infrun_debug_printf ("do_target_wait returned no event"); | |
4204 | disable_commit_resumed.reset_and_commit (); | |
4205 | return; | |
4206 | } | |
5b6d1e4f | 4207 | |
183be222 | 4208 | gdb_assert (ecs->ws.kind () != TARGET_WAITKIND_IGNORE); |
5b6d1e4f PA |
4209 | |
4210 | /* Switch to the target that generated the event, so we can do | |
7f08fd51 TBA |
4211 | target calls. */ |
4212 | switch_to_target_no_thread (ecs->target); | |
d238133d TT |
4213 | |
4214 | if (debug_infrun) | |
c272a98c | 4215 | print_target_wait_results (minus_one_ptid, ecs->ptid, ecs->ws); |
d238133d TT |
4216 | |
4217 | /* If an error happens while handling the event, propagate GDB's | |
4218 | knowledge of the executing state to the frontend/user running | |
4219 | state. */ | |
4220 | ptid_t finish_ptid = !target_is_non_stop_p () ? minus_one_ptid : ecs->ptid; | |
5b6d1e4f | 4221 | scoped_finish_thread_state finish_state (ecs->target, finish_ptid); |
d238133d | 4222 | |
979a0d13 | 4223 | /* Get executed before scoped_restore_current_thread above to apply |
d238133d TT |
4224 | still for the thread which has thrown the exception. */ |
4225 | auto defer_bpstat_clear | |
4226 | = make_scope_exit (bpstat_clear_actions); | |
4227 | auto defer_delete_threads | |
4228 | = make_scope_exit (delete_just_stopped_threads_infrun_breakpoints); | |
4229 | ||
4230 | /* Now figure out what to do with the result of the result. */ | |
4231 | handle_inferior_event (ecs); | |
4232 | ||
4233 | if (!ecs->wait_some_more) | |
4234 | { | |
5b6d1e4f | 4235 | struct inferior *inf = find_inferior_ptid (ecs->target, ecs->ptid); |
758cb810 | 4236 | bool should_stop = true; |
d238133d | 4237 | struct thread_info *thr = ecs->event_thread; |
d6b48e9c | 4238 | |
d238133d | 4239 | delete_just_stopped_threads_infrun_breakpoints (); |
f107f563 | 4240 | |
573269a8 LS |
4241 | if (thr != nullptr && thr->thread_fsm () != nullptr) |
4242 | should_stop = thr->thread_fsm ()->should_stop (thr); | |
243a9253 | 4243 | |
d238133d TT |
4244 | if (!should_stop) |
4245 | { | |
4246 | keep_going (ecs); | |
4247 | } | |
4248 | else | |
4249 | { | |
46e3ed7f | 4250 | bool should_notify_stop = true; |
d238133d | 4251 | int proceeded = 0; |
1840d81a | 4252 | |
e0c01ce6 PA |
4253 | stop_all_threads_if_all_stop_mode (); |
4254 | ||
d238133d | 4255 | clean_up_just_stopped_threads_fsms (ecs); |
243a9253 | 4256 | |
573269a8 LS |
4257 | if (thr != nullptr && thr->thread_fsm () != nullptr) |
4258 | should_notify_stop | |
4259 | = thr->thread_fsm ()->should_notify_stop (); | |
388a7084 | 4260 | |
d238133d TT |
4261 | if (should_notify_stop) |
4262 | { | |
4263 | /* We may not find an inferior if this was a process exit. */ | |
4264 | if (inf == NULL || inf->control.stop_soon == NO_STOP_QUIETLY) | |
4265 | proceeded = normal_stop (); | |
4266 | } | |
243a9253 | 4267 | |
d238133d TT |
4268 | if (!proceeded) |
4269 | { | |
b1a35af2 | 4270 | inferior_event_handler (INF_EXEC_COMPLETE); |
d238133d TT |
4271 | cmd_done = 1; |
4272 | } | |
873657b9 PA |
4273 | |
4274 | /* If we got a TARGET_WAITKIND_NO_RESUMED event, then the | |
4275 | previously selected thread is gone. We have two | |
4276 | choices - switch to no thread selected, or restore the | |
4277 | previously selected thread (now exited). We chose the | |
4278 | later, just because that's what GDB used to do. After | |
4279 | this, "info threads" says "The current thread <Thread | |
4280 | ID 2> has terminated." instead of "No thread | |
4281 | selected.". */ | |
4282 | if (!non_stop | |
4283 | && cmd_done | |
183be222 | 4284 | && ecs->ws.kind () != TARGET_WAITKIND_NO_RESUMED) |
873657b9 | 4285 | restore_thread.dont_restore (); |
d238133d TT |
4286 | } |
4287 | } | |
4f8d22e3 | 4288 | |
d238133d TT |
4289 | defer_delete_threads.release (); |
4290 | defer_bpstat_clear.release (); | |
29f49a6a | 4291 | |
d238133d TT |
4292 | /* No error, don't finish the thread states yet. */ |
4293 | finish_state.release (); | |
731f534f | 4294 | |
1192f124 SM |
4295 | disable_commit_resumed.reset_and_commit (); |
4296 | ||
d238133d TT |
4297 | /* This scope is used to ensure that readline callbacks are |
4298 | reinstalled here. */ | |
4299 | } | |
4f8d22e3 | 4300 | |
152a1749 SM |
4301 | /* Handling this event might have caused some inferiors to become prunable. |
4302 | For example, the exit of an inferior that was automatically added. Try | |
4303 | to get rid of them. Keeping those around slows down things linearly. | |
4304 | ||
4305 | Note that this never removes the current inferior. Therefore, call this | |
4306 | after RESTORE_THREAD went out of scope, in case the event inferior (which was | |
4307 | temporarily made the current inferior) is meant to be deleted. | |
4308 | ||
4309 | Call this before all_uis_check_sync_execution_done, so that notifications about | |
4310 | removed inferiors appear before the prompt. */ | |
4311 | prune_inferiors (); | |
4312 | ||
3b12939d PA |
4313 | /* If a UI was in sync execution mode, and now isn't, restore its |
4314 | prompt (a synchronous execution command has finished, and we're | |
4315 | ready for input). */ | |
4316 | all_uis_check_sync_execution_done (); | |
0f641c01 PA |
4317 | |
4318 | if (cmd_done | |
0f641c01 | 4319 | && exec_done_display_p |
00431a78 PA |
4320 | && (inferior_ptid == null_ptid |
4321 | || inferior_thread ()->state != THREAD_RUNNING)) | |
6cb06a8c | 4322 | gdb_printf (_("completed.\n")); |
43ff13b4 JM |
4323 | } |
4324 | ||
29734269 SM |
4325 | /* See infrun.h. */ |
4326 | ||
edb3359d | 4327 | void |
bd2b40ac | 4328 | set_step_info (thread_info *tp, frame_info_ptr frame, |
29734269 | 4329 | struct symtab_and_line sal) |
edb3359d | 4330 | { |
29734269 SM |
4331 | /* This can be removed once this function no longer implicitly relies on the |
4332 | inferior_ptid value. */ | |
4333 | gdb_assert (inferior_ptid == tp->ptid); | |
edb3359d | 4334 | |
16c381f0 JK |
4335 | tp->control.step_frame_id = get_frame_id (frame); |
4336 | tp->control.step_stack_frame_id = get_stack_frame_id (frame); | |
edb3359d DJ |
4337 | |
4338 | tp->current_symtab = sal.symtab; | |
4339 | tp->current_line = sal.line; | |
c8353d68 AB |
4340 | |
4341 | infrun_debug_printf | |
4342 | ("symtab = %s, line = %d, step_frame_id = %s, step_stack_frame_id = %s", | |
b7e07722 PA |
4343 | tp->current_symtab != nullptr ? tp->current_symtab->filename : "<null>", |
4344 | tp->current_line, | |
c8353d68 AB |
4345 | tp->control.step_frame_id.to_string ().c_str (), |
4346 | tp->control.step_stack_frame_id.to_string ().c_str ()); | |
edb3359d DJ |
4347 | } |
4348 | ||
0d1e5fa7 PA |
4349 | /* Clear context switchable stepping state. */ |
4350 | ||
4351 | void | |
4e1c45ea | 4352 | init_thread_stepping_state (struct thread_info *tss) |
0d1e5fa7 | 4353 | { |
7f5ef605 | 4354 | tss->stepped_breakpoint = 0; |
0d1e5fa7 | 4355 | tss->stepping_over_breakpoint = 0; |
963f9c80 | 4356 | tss->stepping_over_watchpoint = 0; |
0d1e5fa7 | 4357 | tss->step_after_step_resume_breakpoint = 0; |
cd0fc7c3 SS |
4358 | } |
4359 | ||
ab1ddbcf | 4360 | /* See infrun.h. */ |
c32c64b7 | 4361 | |
6efcd9a8 | 4362 | void |
5b6d1e4f | 4363 | set_last_target_status (process_stratum_target *target, ptid_t ptid, |
183be222 | 4364 | const target_waitstatus &status) |
c32c64b7 | 4365 | { |
5b6d1e4f | 4366 | target_last_proc_target = target; |
c32c64b7 DE |
4367 | target_last_wait_ptid = ptid; |
4368 | target_last_waitstatus = status; | |
4369 | } | |
4370 | ||
ab1ddbcf | 4371 | /* See infrun.h. */ |
e02bc4cc DS |
4372 | |
4373 | void | |
5b6d1e4f PA |
4374 | get_last_target_status (process_stratum_target **target, ptid_t *ptid, |
4375 | target_waitstatus *status) | |
e02bc4cc | 4376 | { |
5b6d1e4f PA |
4377 | if (target != nullptr) |
4378 | *target = target_last_proc_target; | |
ab1ddbcf PA |
4379 | if (ptid != nullptr) |
4380 | *ptid = target_last_wait_ptid; | |
4381 | if (status != nullptr) | |
4382 | *status = target_last_waitstatus; | |
e02bc4cc DS |
4383 | } |
4384 | ||
ab1ddbcf PA |
4385 | /* See infrun.h. */ |
4386 | ||
ac264b3b MS |
4387 | void |
4388 | nullify_last_target_wait_ptid (void) | |
4389 | { | |
5b6d1e4f | 4390 | target_last_proc_target = nullptr; |
ac264b3b | 4391 | target_last_wait_ptid = minus_one_ptid; |
ab1ddbcf | 4392 | target_last_waitstatus = {}; |
ac264b3b MS |
4393 | } |
4394 | ||
dcf4fbde | 4395 | /* Switch thread contexts. */ |
dd80620e MS |
4396 | |
4397 | static void | |
00431a78 | 4398 | context_switch (execution_control_state *ecs) |
dd80620e | 4399 | { |
1eb8556f | 4400 | if (ecs->ptid != inferior_ptid |
5b6d1e4f PA |
4401 | && (inferior_ptid == null_ptid |
4402 | || ecs->event_thread != inferior_thread ())) | |
fd48f117 | 4403 | { |
1eb8556f | 4404 | infrun_debug_printf ("Switching context from %s to %s", |
0fab7955 SM |
4405 | inferior_ptid.to_string ().c_str (), |
4406 | ecs->ptid.to_string ().c_str ()); | |
fd48f117 DJ |
4407 | } |
4408 | ||
00431a78 | 4409 | switch_to_thread (ecs->event_thread); |
dd80620e MS |
4410 | } |
4411 | ||
d8dd4d5f PA |
4412 | /* If the target can't tell whether we've hit breakpoints |
4413 | (target_supports_stopped_by_sw_breakpoint), and we got a SIGTRAP, | |
4414 | check whether that could have been caused by a breakpoint. If so, | |
4415 | adjust the PC, per gdbarch_decr_pc_after_break. */ | |
4416 | ||
4fa8626c | 4417 | static void |
d8dd4d5f | 4418 | adjust_pc_after_break (struct thread_info *thread, |
c272a98c | 4419 | const target_waitstatus &ws) |
4fa8626c | 4420 | { |
24a73cce UW |
4421 | struct regcache *regcache; |
4422 | struct gdbarch *gdbarch; | |
118e6252 | 4423 | CORE_ADDR breakpoint_pc, decr_pc; |
4fa8626c | 4424 | |
4fa8626c DJ |
4425 | /* If we've hit a breakpoint, we'll normally be stopped with SIGTRAP. If |
4426 | we aren't, just return. | |
9709f61c DJ |
4427 | |
4428 | We assume that waitkinds other than TARGET_WAITKIND_STOPPED are not | |
b798847d UW |
4429 | affected by gdbarch_decr_pc_after_break. Other waitkinds which are |
4430 | implemented by software breakpoints should be handled through the normal | |
4431 | breakpoint layer. | |
8fb3e588 | 4432 | |
4fa8626c DJ |
4433 | NOTE drow/2004-01-31: On some targets, breakpoints may generate |
4434 | different signals (SIGILL or SIGEMT for instance), but it is less | |
4435 | clear where the PC is pointing afterwards. It may not match | |
b798847d UW |
4436 | gdbarch_decr_pc_after_break. I don't know any specific target that |
4437 | generates these signals at breakpoints (the code has been in GDB since at | |
4438 | least 1992) so I can not guess how to handle them here. | |
8fb3e588 | 4439 | |
e6cf7916 UW |
4440 | In earlier versions of GDB, a target with |
4441 | gdbarch_have_nonsteppable_watchpoint would have the PC after hitting a | |
b798847d UW |
4442 | watchpoint affected by gdbarch_decr_pc_after_break. I haven't found any |
4443 | target with both of these set in GDB history, and it seems unlikely to be | |
4444 | correct, so gdbarch_have_nonsteppable_watchpoint is not checked here. */ | |
4fa8626c | 4445 | |
c272a98c | 4446 | if (ws.kind () != TARGET_WAITKIND_STOPPED) |
4fa8626c DJ |
4447 | return; |
4448 | ||
c272a98c | 4449 | if (ws.sig () != GDB_SIGNAL_TRAP) |
4fa8626c DJ |
4450 | return; |
4451 | ||
4058b839 PA |
4452 | /* In reverse execution, when a breakpoint is hit, the instruction |
4453 | under it has already been de-executed. The reported PC always | |
4454 | points at the breakpoint address, so adjusting it further would | |
4455 | be wrong. E.g., consider this case on a decr_pc_after_break == 1 | |
4456 | architecture: | |
4457 | ||
4458 | B1 0x08000000 : INSN1 | |
4459 | B2 0x08000001 : INSN2 | |
4460 | 0x08000002 : INSN3 | |
4461 | PC -> 0x08000003 : INSN4 | |
4462 | ||
4463 | Say you're stopped at 0x08000003 as above. Reverse continuing | |
4464 | from that point should hit B2 as below. Reading the PC when the | |
4465 | SIGTRAP is reported should read 0x08000001 and INSN2 should have | |
4466 | been de-executed already. | |
4467 | ||
4468 | B1 0x08000000 : INSN1 | |
4469 | B2 PC -> 0x08000001 : INSN2 | |
4470 | 0x08000002 : INSN3 | |
4471 | 0x08000003 : INSN4 | |
4472 | ||
4473 | We can't apply the same logic as for forward execution, because | |
4474 | we would wrongly adjust the PC to 0x08000000, since there's a | |
4475 | breakpoint at PC - 1. We'd then report a hit on B1, although | |
4476 | INSN1 hadn't been de-executed yet. Doing nothing is the correct | |
4477 | behaviour. */ | |
4478 | if (execution_direction == EXEC_REVERSE) | |
4479 | return; | |
4480 | ||
1cf4d951 PA |
4481 | /* If the target can tell whether the thread hit a SW breakpoint, |
4482 | trust it. Targets that can tell also adjust the PC | |
4483 | themselves. */ | |
4484 | if (target_supports_stopped_by_sw_breakpoint ()) | |
4485 | return; | |
4486 | ||
4487 | /* Note that relying on whether a breakpoint is planted in memory to | |
4488 | determine this can fail. E.g,. the breakpoint could have been | |
4489 | removed since. Or the thread could have been told to step an | |
4490 | instruction the size of a breakpoint instruction, and only | |
4491 | _after_ was a breakpoint inserted at its address. */ | |
4492 | ||
24a73cce UW |
4493 | /* If this target does not decrement the PC after breakpoints, then |
4494 | we have nothing to do. */ | |
00431a78 | 4495 | regcache = get_thread_regcache (thread); |
ac7936df | 4496 | gdbarch = regcache->arch (); |
118e6252 | 4497 | |
527a273a | 4498 | decr_pc = gdbarch_decr_pc_after_break (gdbarch); |
118e6252 | 4499 | if (decr_pc == 0) |
24a73cce UW |
4500 | return; |
4501 | ||
8b86c959 | 4502 | const address_space *aspace = regcache->aspace (); |
6c95b8df | 4503 | |
8aad930b AC |
4504 | /* Find the location where (if we've hit a breakpoint) the |
4505 | breakpoint would be. */ | |
118e6252 | 4506 | breakpoint_pc = regcache_read_pc (regcache) - decr_pc; |
8aad930b | 4507 | |
1cf4d951 PA |
4508 | /* If the target can't tell whether a software breakpoint triggered, |
4509 | fallback to figuring it out based on breakpoints we think were | |
4510 | inserted in the target, and on whether the thread was stepped or | |
4511 | continued. */ | |
4512 | ||
1c5cfe86 PA |
4513 | /* Check whether there actually is a software breakpoint inserted at |
4514 | that location. | |
4515 | ||
4516 | If in non-stop mode, a race condition is possible where we've | |
4517 | removed a breakpoint, but stop events for that breakpoint were | |
4518 | already queued and arrive later. To suppress those spurious | |
4519 | SIGTRAPs, we keep a list of such breakpoint locations for a bit, | |
1cf4d951 PA |
4520 | and retire them after a number of stop events are reported. Note |
4521 | this is an heuristic and can thus get confused. The real fix is | |
4522 | to get the "stopped by SW BP and needs adjustment" info out of | |
4523 | the target/kernel (and thus never reach here; see above). */ | |
6c95b8df | 4524 | if (software_breakpoint_inserted_here_p (aspace, breakpoint_pc) |
fbea99ea PA |
4525 | || (target_is_non_stop_p () |
4526 | && moribund_breakpoint_here_p (aspace, breakpoint_pc))) | |
8aad930b | 4527 | { |
07036511 | 4528 | gdb::optional<scoped_restore_tmpl<int>> restore_operation_disable; |
abbb1732 | 4529 | |
8213266a | 4530 | if (record_full_is_used ()) |
07036511 TT |
4531 | restore_operation_disable.emplace |
4532 | (record_full_gdb_operation_disable_set ()); | |
96429cc8 | 4533 | |
1c0fdd0e UW |
4534 | /* When using hardware single-step, a SIGTRAP is reported for both |
4535 | a completed single-step and a software breakpoint. Need to | |
4536 | differentiate between the two, as the latter needs adjusting | |
4537 | but the former does not. | |
4538 | ||
4539 | The SIGTRAP can be due to a completed hardware single-step only if | |
4540 | - we didn't insert software single-step breakpoints | |
1c0fdd0e UW |
4541 | - this thread is currently being stepped |
4542 | ||
4543 | If any of these events did not occur, we must have stopped due | |
4544 | to hitting a software breakpoint, and have to back up to the | |
4545 | breakpoint address. | |
4546 | ||
4547 | As a special case, we could have hardware single-stepped a | |
4548 | software breakpoint. In this case (prev_pc == breakpoint_pc), | |
4549 | we also need to back up to the breakpoint address. */ | |
4550 | ||
d8dd4d5f PA |
4551 | if (thread_has_single_step_breakpoints_set (thread) |
4552 | || !currently_stepping (thread) | |
4553 | || (thread->stepped_breakpoint | |
4554 | && thread->prev_pc == breakpoint_pc)) | |
515630c5 | 4555 | regcache_write_pc (regcache, breakpoint_pc); |
8aad930b | 4556 | } |
4fa8626c DJ |
4557 | } |
4558 | ||
c4464ade | 4559 | static bool |
bd2b40ac | 4560 | stepped_in_from (frame_info_ptr frame, struct frame_id step_frame_id) |
edb3359d DJ |
4561 | { |
4562 | for (frame = get_prev_frame (frame); | |
4563 | frame != NULL; | |
4564 | frame = get_prev_frame (frame)) | |
4565 | { | |
a0cbd650 | 4566 | if (get_frame_id (frame) == step_frame_id) |
c4464ade SM |
4567 | return true; |
4568 | ||
edb3359d DJ |
4569 | if (get_frame_type (frame) != INLINE_FRAME) |
4570 | break; | |
4571 | } | |
4572 | ||
c4464ade | 4573 | return false; |
edb3359d DJ |
4574 | } |
4575 | ||
4a4c04f1 BE |
4576 | /* Look for an inline frame that is marked for skip. |
4577 | If PREV_FRAME is TRUE start at the previous frame, | |
4578 | otherwise start at the current frame. Stop at the | |
4579 | first non-inline frame, or at the frame where the | |
4580 | step started. */ | |
4581 | ||
4582 | static bool | |
4583 | inline_frame_is_marked_for_skip (bool prev_frame, struct thread_info *tp) | |
4584 | { | |
bd2b40ac | 4585 | frame_info_ptr frame = get_current_frame (); |
4a4c04f1 BE |
4586 | |
4587 | if (prev_frame) | |
4588 | frame = get_prev_frame (frame); | |
4589 | ||
4590 | for (; frame != NULL; frame = get_prev_frame (frame)) | |
4591 | { | |
4592 | const char *fn = NULL; | |
4593 | symtab_and_line sal; | |
4594 | struct symbol *sym; | |
4595 | ||
a0cbd650 | 4596 | if (get_frame_id (frame) == tp->control.step_frame_id) |
4a4c04f1 BE |
4597 | break; |
4598 | if (get_frame_type (frame) != INLINE_FRAME) | |
4599 | break; | |
4600 | ||
4601 | sal = find_frame_sal (frame); | |
4602 | sym = get_frame_function (frame); | |
4603 | ||
4604 | if (sym != NULL) | |
4605 | fn = sym->print_name (); | |
4606 | ||
4607 | if (sal.line != 0 | |
4608 | && function_name_is_marked_for_skip (fn, sal)) | |
4609 | return true; | |
4610 | } | |
4611 | ||
4612 | return false; | |
4613 | } | |
4614 | ||
c65d6b55 PA |
4615 | /* If the event thread has the stop requested flag set, pretend it |
4616 | stopped for a GDB_SIGNAL_0 (i.e., as if it stopped due to | |
4617 | target_stop). */ | |
4618 | ||
4619 | static bool | |
4620 | handle_stop_requested (struct execution_control_state *ecs) | |
4621 | { | |
4622 | if (ecs->event_thread->stop_requested) | |
4623 | { | |
183be222 | 4624 | ecs->ws.set_stopped (GDB_SIGNAL_0); |
c65d6b55 PA |
4625 | handle_signal_stop (ecs); |
4626 | return true; | |
4627 | } | |
4628 | return false; | |
4629 | } | |
4630 | ||
a96d9b2e | 4631 | /* Auxiliary function that handles syscall entry/return events. |
c4464ade SM |
4632 | It returns true if the inferior should keep going (and GDB |
4633 | should ignore the event), or false if the event deserves to be | |
a96d9b2e | 4634 | processed. */ |
ca2163eb | 4635 | |
c4464ade | 4636 | static bool |
ca2163eb | 4637 | handle_syscall_event (struct execution_control_state *ecs) |
a96d9b2e | 4638 | { |
ca2163eb | 4639 | struct regcache *regcache; |
ca2163eb PA |
4640 | int syscall_number; |
4641 | ||
00431a78 | 4642 | context_switch (ecs); |
ca2163eb | 4643 | |
00431a78 | 4644 | regcache = get_thread_regcache (ecs->event_thread); |
183be222 | 4645 | syscall_number = ecs->ws.syscall_number (); |
1edb66d8 | 4646 | ecs->event_thread->set_stop_pc (regcache_read_pc (regcache)); |
ca2163eb | 4647 | |
a96d9b2e | 4648 | if (catch_syscall_enabled () > 0 |
9fe3819e | 4649 | && catching_syscall_number (syscall_number)) |
a96d9b2e | 4650 | { |
1eb8556f | 4651 | infrun_debug_printf ("syscall number=%d", syscall_number); |
a96d9b2e | 4652 | |
16c381f0 | 4653 | ecs->event_thread->control.stop_bpstat |
d37e0847 PA |
4654 | = bpstat_stop_status_nowatch (regcache->aspace (), |
4655 | ecs->event_thread->stop_pc (), | |
4656 | ecs->event_thread, ecs->ws); | |
ab04a2af | 4657 | |
c65d6b55 | 4658 | if (handle_stop_requested (ecs)) |
c4464ade | 4659 | return false; |
c65d6b55 | 4660 | |
ce12b012 | 4661 | if (bpstat_causes_stop (ecs->event_thread->control.stop_bpstat)) |
ca2163eb PA |
4662 | { |
4663 | /* Catchpoint hit. */ | |
c4464ade | 4664 | return false; |
ca2163eb | 4665 | } |
a96d9b2e | 4666 | } |
ca2163eb | 4667 | |
c65d6b55 | 4668 | if (handle_stop_requested (ecs)) |
c4464ade | 4669 | return false; |
c65d6b55 | 4670 | |
ca2163eb | 4671 | /* If no catchpoint triggered for this, then keep going. */ |
ca2163eb | 4672 | keep_going (ecs); |
c4464ade SM |
4673 | |
4674 | return true; | |
a96d9b2e SDJ |
4675 | } |
4676 | ||
7e324e48 GB |
4677 | /* Lazily fill in the execution_control_state's stop_func_* fields. */ |
4678 | ||
4679 | static void | |
4680 | fill_in_stop_func (struct gdbarch *gdbarch, | |
4681 | struct execution_control_state *ecs) | |
4682 | { | |
4683 | if (!ecs->stop_func_filled_in) | |
4684 | { | |
98a617f8 | 4685 | const block *block; |
fe830662 | 4686 | const general_symbol_info *gsi; |
98a617f8 | 4687 | |
7e324e48 GB |
4688 | /* Don't care about return value; stop_func_start and stop_func_name |
4689 | will both be 0 if it doesn't work. */ | |
1edb66d8 | 4690 | find_pc_partial_function_sym (ecs->event_thread->stop_pc (), |
fe830662 TT |
4691 | &gsi, |
4692 | &ecs->stop_func_start, | |
4693 | &ecs->stop_func_end, | |
4694 | &block); | |
4695 | ecs->stop_func_name = gsi == nullptr ? nullptr : gsi->print_name (); | |
98a617f8 KB |
4696 | |
4697 | /* The call to find_pc_partial_function, above, will set | |
4698 | stop_func_start and stop_func_end to the start and end | |
4699 | of the range containing the stop pc. If this range | |
4700 | contains the entry pc for the block (which is always the | |
4701 | case for contiguous blocks), advance stop_func_start past | |
4702 | the function's start offset and entrypoint. Note that | |
4703 | stop_func_start is NOT advanced when in a range of a | |
4704 | non-contiguous block that does not contain the entry pc. */ | |
4705 | if (block != nullptr | |
6395b628 SM |
4706 | && ecs->stop_func_start <= block->entry_pc () |
4707 | && block->entry_pc () < ecs->stop_func_end) | |
98a617f8 KB |
4708 | { |
4709 | ecs->stop_func_start | |
4710 | += gdbarch_deprecated_function_start_offset (gdbarch); | |
4711 | ||
4712 | if (gdbarch_skip_entrypoint_p (gdbarch)) | |
4713 | ecs->stop_func_start | |
4714 | = gdbarch_skip_entrypoint (gdbarch, ecs->stop_func_start); | |
4715 | } | |
591a12a1 | 4716 | |
7e324e48 GB |
4717 | ecs->stop_func_filled_in = 1; |
4718 | } | |
4719 | } | |
4720 | ||
4f5d7f63 | 4721 | |
00431a78 | 4722 | /* Return the STOP_SOON field of the inferior pointed at by ECS. */ |
4f5d7f63 PA |
4723 | |
4724 | static enum stop_kind | |
00431a78 | 4725 | get_inferior_stop_soon (execution_control_state *ecs) |
4f5d7f63 | 4726 | { |
5b6d1e4f | 4727 | struct inferior *inf = find_inferior_ptid (ecs->target, ecs->ptid); |
4f5d7f63 PA |
4728 | |
4729 | gdb_assert (inf != NULL); | |
4730 | return inf->control.stop_soon; | |
4731 | } | |
4732 | ||
5b6d1e4f PA |
4733 | /* Poll for one event out of the current target. Store the resulting |
4734 | waitstatus in WS, and return the event ptid. Does not block. */ | |
372316f1 PA |
4735 | |
4736 | static ptid_t | |
5b6d1e4f | 4737 | poll_one_curr_target (struct target_waitstatus *ws) |
372316f1 PA |
4738 | { |
4739 | ptid_t event_ptid; | |
372316f1 PA |
4740 | |
4741 | overlay_cache_invalid = 1; | |
4742 | ||
4743 | /* Flush target cache before starting to handle each event. | |
4744 | Target was running and cache could be stale. This is just a | |
4745 | heuristic. Running threads may modify target memory, but we | |
4746 | don't get any event. */ | |
4747 | target_dcache_invalidate (); | |
4748 | ||
fb85cece | 4749 | event_ptid = target_wait (minus_one_ptid, ws, TARGET_WNOHANG); |
372316f1 PA |
4750 | |
4751 | if (debug_infrun) | |
c272a98c | 4752 | print_target_wait_results (minus_one_ptid, event_ptid, *ws); |
372316f1 PA |
4753 | |
4754 | return event_ptid; | |
4755 | } | |
4756 | ||
5b6d1e4f PA |
4757 | /* Wait for one event out of any target. */ |
4758 | ||
4759 | static wait_one_event | |
4760 | wait_one () | |
4761 | { | |
4762 | while (1) | |
4763 | { | |
4764 | for (inferior *inf : all_inferiors ()) | |
4765 | { | |
4766 | process_stratum_target *target = inf->process_target (); | |
4767 | if (target == NULL | |
4768 | || !target->is_async_p () | |
4769 | || !target->threads_executing) | |
4770 | continue; | |
4771 | ||
4772 | switch_to_inferior_no_thread (inf); | |
4773 | ||
4774 | wait_one_event event; | |
4775 | event.target = target; | |
4776 | event.ptid = poll_one_curr_target (&event.ws); | |
4777 | ||
183be222 | 4778 | if (event.ws.kind () == TARGET_WAITKIND_NO_RESUMED) |
5b6d1e4f PA |
4779 | { |
4780 | /* If nothing is resumed, remove the target from the | |
4781 | event loop. */ | |
4a570176 | 4782 | target_async (false); |
5b6d1e4f | 4783 | } |
183be222 | 4784 | else if (event.ws.kind () != TARGET_WAITKIND_IGNORE) |
5b6d1e4f PA |
4785 | return event; |
4786 | } | |
4787 | ||
4788 | /* Block waiting for some event. */ | |
4789 | ||
4790 | fd_set readfds; | |
4791 | int nfds = 0; | |
4792 | ||
4793 | FD_ZERO (&readfds); | |
4794 | ||
4795 | for (inferior *inf : all_inferiors ()) | |
4796 | { | |
4797 | process_stratum_target *target = inf->process_target (); | |
4798 | if (target == NULL | |
4799 | || !target->is_async_p () | |
4800 | || !target->threads_executing) | |
4801 | continue; | |
4802 | ||
4803 | int fd = target->async_wait_fd (); | |
4804 | FD_SET (fd, &readfds); | |
4805 | if (nfds <= fd) | |
4806 | nfds = fd + 1; | |
4807 | } | |
4808 | ||
4809 | if (nfds == 0) | |
4810 | { | |
4811 | /* No waitable targets left. All must be stopped. */ | |
183be222 SM |
4812 | target_waitstatus ws; |
4813 | ws.set_no_resumed (); | |
4814 | return {NULL, minus_one_ptid, std::move (ws)}; | |
5b6d1e4f PA |
4815 | } |
4816 | ||
4817 | QUIT; | |
4818 | ||
4819 | int numfds = interruptible_select (nfds, &readfds, 0, NULL, 0); | |
4820 | if (numfds < 0) | |
4821 | { | |
4822 | if (errno == EINTR) | |
4823 | continue; | |
4824 | else | |
4825 | perror_with_name ("interruptible_select"); | |
4826 | } | |
4827 | } | |
4828 | } | |
4829 | ||
372316f1 PA |
4830 | /* Save the thread's event and stop reason to process it later. */ |
4831 | ||
4832 | static void | |
c272a98c | 4833 | save_waitstatus (struct thread_info *tp, const target_waitstatus &ws) |
372316f1 | 4834 | { |
96bbe3ef | 4835 | infrun_debug_printf ("saving status %s for %s", |
c272a98c | 4836 | ws.to_string ().c_str (), |
96bbe3ef | 4837 | tp->ptid.to_string ().c_str ()); |
372316f1 PA |
4838 | |
4839 | /* Record for later. */ | |
c272a98c | 4840 | tp->set_pending_waitstatus (ws); |
372316f1 | 4841 | |
c272a98c SM |
4842 | if (ws.kind () == TARGET_WAITKIND_STOPPED |
4843 | && ws.sig () == GDB_SIGNAL_TRAP) | |
372316f1 | 4844 | { |
89ba430c SM |
4845 | struct regcache *regcache = get_thread_regcache (tp); |
4846 | const address_space *aspace = regcache->aspace (); | |
372316f1 PA |
4847 | CORE_ADDR pc = regcache_read_pc (regcache); |
4848 | ||
c272a98c | 4849 | adjust_pc_after_break (tp, tp->pending_waitstatus ()); |
372316f1 | 4850 | |
18493a00 PA |
4851 | scoped_restore_current_thread restore_thread; |
4852 | switch_to_thread (tp); | |
4853 | ||
4854 | if (target_stopped_by_watchpoint ()) | |
1edb66d8 | 4855 | tp->set_stop_reason (TARGET_STOPPED_BY_WATCHPOINT); |
372316f1 | 4856 | else if (target_supports_stopped_by_sw_breakpoint () |
18493a00 | 4857 | && target_stopped_by_sw_breakpoint ()) |
1edb66d8 | 4858 | tp->set_stop_reason (TARGET_STOPPED_BY_SW_BREAKPOINT); |
372316f1 | 4859 | else if (target_supports_stopped_by_hw_breakpoint () |
18493a00 | 4860 | && target_stopped_by_hw_breakpoint ()) |
1edb66d8 | 4861 | tp->set_stop_reason (TARGET_STOPPED_BY_HW_BREAKPOINT); |
372316f1 | 4862 | else if (!target_supports_stopped_by_hw_breakpoint () |
1edb66d8 SM |
4863 | && hardware_breakpoint_inserted_here_p (aspace, pc)) |
4864 | tp->set_stop_reason (TARGET_STOPPED_BY_HW_BREAKPOINT); | |
372316f1 | 4865 | else if (!target_supports_stopped_by_sw_breakpoint () |
1edb66d8 SM |
4866 | && software_breakpoint_inserted_here_p (aspace, pc)) |
4867 | tp->set_stop_reason (TARGET_STOPPED_BY_SW_BREAKPOINT); | |
372316f1 PA |
4868 | else if (!thread_has_single_step_breakpoints_set (tp) |
4869 | && currently_stepping (tp)) | |
1edb66d8 | 4870 | tp->set_stop_reason (TARGET_STOPPED_BY_SINGLE_STEP); |
372316f1 PA |
4871 | } |
4872 | } | |
4873 | ||
293b3ebc TBA |
4874 | /* Mark the non-executing threads accordingly. In all-stop, all |
4875 | threads of all processes are stopped when we get any event | |
4876 | reported. In non-stop mode, only the event thread stops. */ | |
4877 | ||
4878 | static void | |
4879 | mark_non_executing_threads (process_stratum_target *target, | |
4880 | ptid_t event_ptid, | |
183be222 | 4881 | const target_waitstatus &ws) |
293b3ebc TBA |
4882 | { |
4883 | ptid_t mark_ptid; | |
4884 | ||
4885 | if (!target_is_non_stop_p ()) | |
4886 | mark_ptid = minus_one_ptid; | |
183be222 SM |
4887 | else if (ws.kind () == TARGET_WAITKIND_SIGNALLED |
4888 | || ws.kind () == TARGET_WAITKIND_EXITED) | |
293b3ebc TBA |
4889 | { |
4890 | /* If we're handling a process exit in non-stop mode, even | |
4891 | though threads haven't been deleted yet, one would think | |
4892 | that there is nothing to do, as threads of the dead process | |
4893 | will be soon deleted, and threads of any other process were | |
4894 | left running. However, on some targets, threads survive a | |
4895 | process exit event. E.g., for the "checkpoint" command, | |
4896 | when the current checkpoint/fork exits, linux-fork.c | |
4897 | automatically switches to another fork from within | |
4898 | target_mourn_inferior, by associating the same | |
4899 | inferior/thread to another fork. We haven't mourned yet at | |
4900 | this point, but we must mark any threads left in the | |
4901 | process as not-executing so that finish_thread_state marks | |
4902 | them stopped (in the user's perspective) if/when we present | |
4903 | the stop to the user. */ | |
4904 | mark_ptid = ptid_t (event_ptid.pid ()); | |
4905 | } | |
4906 | else | |
4907 | mark_ptid = event_ptid; | |
4908 | ||
4909 | set_executing (target, mark_ptid, false); | |
4910 | ||
4911 | /* Likewise the resumed flag. */ | |
4912 | set_resumed (target, mark_ptid, false); | |
4913 | } | |
4914 | ||
d758e62c PA |
4915 | /* Handle one event after stopping threads. If the eventing thread |
4916 | reports back any interesting event, we leave it pending. If the | |
4917 | eventing thread was in the middle of a displaced step, we | |
8ff53139 PA |
4918 | cancel/finish it, and unless the thread's inferior is being |
4919 | detached, put the thread back in the step-over chain. Returns true | |
4920 | if there are no resumed threads left in the target (thus there's no | |
4921 | point in waiting further), false otherwise. */ | |
d758e62c PA |
4922 | |
4923 | static bool | |
4924 | handle_one (const wait_one_event &event) | |
4925 | { | |
4926 | infrun_debug_printf | |
7dca2ea7 | 4927 | ("%s %s", event.ws.to_string ().c_str (), |
0fab7955 | 4928 | event.ptid.to_string ().c_str ()); |
d758e62c | 4929 | |
183be222 | 4930 | if (event.ws.kind () == TARGET_WAITKIND_NO_RESUMED) |
d758e62c PA |
4931 | { |
4932 | /* All resumed threads exited. */ | |
4933 | return true; | |
4934 | } | |
183be222 SM |
4935 | else if (event.ws.kind () == TARGET_WAITKIND_THREAD_EXITED |
4936 | || event.ws.kind () == TARGET_WAITKIND_EXITED | |
4937 | || event.ws.kind () == TARGET_WAITKIND_SIGNALLED) | |
d758e62c PA |
4938 | { |
4939 | /* One thread/process exited/signalled. */ | |
4940 | ||
4941 | thread_info *t = nullptr; | |
4942 | ||
4943 | /* The target may have reported just a pid. If so, try | |
4944 | the first non-exited thread. */ | |
4945 | if (event.ptid.is_pid ()) | |
4946 | { | |
4947 | int pid = event.ptid.pid (); | |
4948 | inferior *inf = find_inferior_pid (event.target, pid); | |
4949 | for (thread_info *tp : inf->non_exited_threads ()) | |
4950 | { | |
4951 | t = tp; | |
4952 | break; | |
4953 | } | |
4954 | ||
4955 | /* If there is no available thread, the event would | |
4956 | have to be appended to a per-inferior event list, | |
4957 | which does not exist (and if it did, we'd have | |
4958 | to adjust run control command to be able to | |
4959 | resume such an inferior). We assert here instead | |
4960 | of going into an infinite loop. */ | |
4961 | gdb_assert (t != nullptr); | |
4962 | ||
4963 | infrun_debug_printf | |
0fab7955 | 4964 | ("using %s", t->ptid.to_string ().c_str ()); |
d758e62c PA |
4965 | } |
4966 | else | |
4967 | { | |
4968 | t = find_thread_ptid (event.target, event.ptid); | |
4969 | /* Check if this is the first time we see this thread. | |
4970 | Don't bother adding if it individually exited. */ | |
4971 | if (t == nullptr | |
183be222 | 4972 | && event.ws.kind () != TARGET_WAITKIND_THREAD_EXITED) |
d758e62c PA |
4973 | t = add_thread (event.target, event.ptid); |
4974 | } | |
4975 | ||
4976 | if (t != nullptr) | |
4977 | { | |
4978 | /* Set the threads as non-executing to avoid | |
4979 | another stop attempt on them. */ | |
4980 | switch_to_thread_no_regs (t); | |
4981 | mark_non_executing_threads (event.target, event.ptid, | |
4982 | event.ws); | |
c272a98c | 4983 | save_waitstatus (t, event.ws); |
d758e62c PA |
4984 | t->stop_requested = false; |
4985 | } | |
4986 | } | |
4987 | else | |
4988 | { | |
4989 | thread_info *t = find_thread_ptid (event.target, event.ptid); | |
4990 | if (t == NULL) | |
4991 | t = add_thread (event.target, event.ptid); | |
4992 | ||
4993 | t->stop_requested = 0; | |
611841bb | 4994 | t->set_executing (false); |
7846f3aa | 4995 | t->set_resumed (false); |
d758e62c PA |
4996 | t->control.may_range_step = 0; |
4997 | ||
4998 | /* This may be the first time we see the inferior report | |
4999 | a stop. */ | |
3db13541 | 5000 | if (t->inf->needs_setup) |
d758e62c PA |
5001 | { |
5002 | switch_to_thread_no_regs (t); | |
5003 | setup_inferior (0); | |
5004 | } | |
5005 | ||
183be222 SM |
5006 | if (event.ws.kind () == TARGET_WAITKIND_STOPPED |
5007 | && event.ws.sig () == GDB_SIGNAL_0) | |
d758e62c PA |
5008 | { |
5009 | /* We caught the event that we intended to catch, so | |
1edb66d8 | 5010 | there's no event to save as pending. */ |
d758e62c PA |
5011 | |
5012 | if (displaced_step_finish (t, GDB_SIGNAL_0) | |
5013 | == DISPLACED_STEP_FINISH_STATUS_NOT_EXECUTED) | |
5014 | { | |
5015 | /* Add it back to the step-over queue. */ | |
5016 | infrun_debug_printf | |
5017 | ("displaced-step of %s canceled", | |
0fab7955 | 5018 | t->ptid.to_string ().c_str ()); |
d758e62c PA |
5019 | |
5020 | t->control.trap_expected = 0; | |
8ff53139 PA |
5021 | if (!t->inf->detaching) |
5022 | global_thread_step_over_chain_enqueue (t); | |
d758e62c PA |
5023 | } |
5024 | } | |
5025 | else | |
5026 | { | |
5027 | enum gdb_signal sig; | |
5028 | struct regcache *regcache; | |
5029 | ||
5030 | infrun_debug_printf | |
96bbe3ef | 5031 | ("target_wait %s, saving status for %s", |
7dca2ea7 | 5032 | event.ws.to_string ().c_str (), |
96bbe3ef | 5033 | t->ptid.to_string ().c_str ()); |
d758e62c PA |
5034 | |
5035 | /* Record for later. */ | |
c272a98c | 5036 | save_waitstatus (t, event.ws); |
d758e62c | 5037 | |
183be222 SM |
5038 | sig = (event.ws.kind () == TARGET_WAITKIND_STOPPED |
5039 | ? event.ws.sig () : GDB_SIGNAL_0); | |
d758e62c PA |
5040 | |
5041 | if (displaced_step_finish (t, sig) | |
5042 | == DISPLACED_STEP_FINISH_STATUS_NOT_EXECUTED) | |
5043 | { | |
5044 | /* Add it back to the step-over queue. */ | |
5045 | t->control.trap_expected = 0; | |
8ff53139 PA |
5046 | if (!t->inf->detaching) |
5047 | global_thread_step_over_chain_enqueue (t); | |
d758e62c PA |
5048 | } |
5049 | ||
5050 | regcache = get_thread_regcache (t); | |
1edb66d8 | 5051 | t->set_stop_pc (regcache_read_pc (regcache)); |
d758e62c PA |
5052 | |
5053 | infrun_debug_printf ("saved stop_pc=%s for %s " | |
5054 | "(currently_stepping=%d)", | |
1edb66d8 | 5055 | paddress (target_gdbarch (), t->stop_pc ()), |
0fab7955 | 5056 | t->ptid.to_string ().c_str (), |
d758e62c PA |
5057 | currently_stepping (t)); |
5058 | } | |
5059 | } | |
5060 | ||
5061 | return false; | |
5062 | } | |
5063 | ||
6efcd9a8 | 5064 | /* See infrun.h. */ |
372316f1 | 5065 | |
6efcd9a8 | 5066 | void |
148cf134 | 5067 | stop_all_threads (const char *reason, inferior *inf) |
372316f1 PA |
5068 | { |
5069 | /* We may need multiple passes to discover all threads. */ | |
5070 | int pass; | |
5071 | int iterations = 0; | |
372316f1 | 5072 | |
53cccef1 | 5073 | gdb_assert (exists_non_stop_target ()); |
372316f1 | 5074 | |
148cf134 SM |
5075 | INFRUN_SCOPED_DEBUG_START_END ("reason=%s, inf=%d", reason, |
5076 | inf != nullptr ? inf->num : -1); | |
372316f1 | 5077 | |
1f9d9e32 AB |
5078 | infrun_debug_show_threads ("non-exited threads", |
5079 | all_non_exited_threads ()); | |
5080 | ||
00431a78 | 5081 | scoped_restore_current_thread restore_thread; |
372316f1 | 5082 | |
148cf134 | 5083 | /* Enable thread events on relevant targets. */ |
6ad82919 TBA |
5084 | for (auto *target : all_non_exited_process_targets ()) |
5085 | { | |
148cf134 SM |
5086 | if (inf != nullptr && inf->process_target () != target) |
5087 | continue; | |
5088 | ||
6ad82919 TBA |
5089 | switch_to_target_no_thread (target); |
5090 | target_thread_events (true); | |
5091 | } | |
5092 | ||
5093 | SCOPE_EXIT | |
5094 | { | |
148cf134 | 5095 | /* Disable thread events on relevant targets. */ |
6ad82919 TBA |
5096 | for (auto *target : all_non_exited_process_targets ()) |
5097 | { | |
148cf134 SM |
5098 | if (inf != nullptr && inf->process_target () != target) |
5099 | continue; | |
5100 | ||
6ad82919 TBA |
5101 | switch_to_target_no_thread (target); |
5102 | target_thread_events (false); | |
5103 | } | |
5104 | ||
17417fb0 | 5105 | /* Use debug_prefixed_printf directly to get a meaningful function |
dda83cd7 | 5106 | name. */ |
6ad82919 | 5107 | if (debug_infrun) |
17417fb0 | 5108 | debug_prefixed_printf ("infrun", "stop_all_threads", "done"); |
6ad82919 | 5109 | }; |
65706a29 | 5110 | |
372316f1 PA |
5111 | /* Request threads to stop, and then wait for the stops. Because |
5112 | threads we already know about can spawn more threads while we're | |
5113 | trying to stop them, and we only learn about new threads when we | |
5114 | update the thread list, do this in a loop, and keep iterating | |
5115 | until two passes find no threads that need to be stopped. */ | |
5116 | for (pass = 0; pass < 2; pass++, iterations++) | |
5117 | { | |
1eb8556f | 5118 | infrun_debug_printf ("pass=%d, iterations=%d", pass, iterations); |
372316f1 PA |
5119 | while (1) |
5120 | { | |
29d6859f | 5121 | int waits_needed = 0; |
372316f1 | 5122 | |
a05575d3 TBA |
5123 | for (auto *target : all_non_exited_process_targets ()) |
5124 | { | |
148cf134 SM |
5125 | if (inf != nullptr && inf->process_target () != target) |
5126 | continue; | |
5127 | ||
a05575d3 TBA |
5128 | switch_to_target_no_thread (target); |
5129 | update_thread_list (); | |
5130 | } | |
372316f1 PA |
5131 | |
5132 | /* Go through all threads looking for threads that we need | |
5133 | to tell the target to stop. */ | |
08036331 | 5134 | for (thread_info *t : all_non_exited_threads ()) |
372316f1 | 5135 | { |
148cf134 SM |
5136 | if (inf != nullptr && t->inf != inf) |
5137 | continue; | |
5138 | ||
53cccef1 TBA |
5139 | /* For a single-target setting with an all-stop target, |
5140 | we would not even arrive here. For a multi-target | |
5141 | setting, until GDB is able to handle a mixture of | |
5142 | all-stop and non-stop targets, simply skip all-stop | |
5143 | targets' threads. This should be fine due to the | |
5144 | protection of 'check_multi_target_resumption'. */ | |
5145 | ||
5146 | switch_to_thread_no_regs (t); | |
5147 | if (!target_is_non_stop_p ()) | |
5148 | continue; | |
5149 | ||
611841bb | 5150 | if (t->executing ()) |
372316f1 PA |
5151 | { |
5152 | /* If already stopping, don't request a stop again. | |
5153 | We just haven't seen the notification yet. */ | |
5154 | if (!t->stop_requested) | |
5155 | { | |
1eb8556f | 5156 | infrun_debug_printf (" %s executing, need stop", |
0fab7955 | 5157 | t->ptid.to_string ().c_str ()); |
372316f1 PA |
5158 | target_stop (t->ptid); |
5159 | t->stop_requested = 1; | |
5160 | } | |
5161 | else | |
5162 | { | |
1eb8556f | 5163 | infrun_debug_printf (" %s executing, already stopping", |
0fab7955 | 5164 | t->ptid.to_string ().c_str ()); |
372316f1 PA |
5165 | } |
5166 | ||
5167 | if (t->stop_requested) | |
29d6859f | 5168 | waits_needed++; |
372316f1 PA |
5169 | } |
5170 | else | |
5171 | { | |
1eb8556f | 5172 | infrun_debug_printf (" %s not executing", |
0fab7955 | 5173 | t->ptid.to_string ().c_str ()); |
372316f1 PA |
5174 | |
5175 | /* The thread may be not executing, but still be | |
5176 | resumed with a pending status to process. */ | |
7846f3aa | 5177 | t->set_resumed (false); |
372316f1 PA |
5178 | } |
5179 | } | |
5180 | ||
29d6859f | 5181 | if (waits_needed == 0) |
372316f1 PA |
5182 | break; |
5183 | ||
5184 | /* If we find new threads on the second iteration, restart | |
5185 | over. We want to see two iterations in a row with all | |
5186 | threads stopped. */ | |
5187 | if (pass > 0) | |
5188 | pass = -1; | |
5189 | ||
29d6859f | 5190 | for (int i = 0; i < waits_needed; i++) |
c29705b7 | 5191 | { |
29d6859f | 5192 | wait_one_event event = wait_one (); |
d758e62c PA |
5193 | if (handle_one (event)) |
5194 | break; | |
372316f1 PA |
5195 | } |
5196 | } | |
5197 | } | |
372316f1 PA |
5198 | } |
5199 | ||
f4836ba9 PA |
5200 | /* Handle a TARGET_WAITKIND_NO_RESUMED event. */ |
5201 | ||
c4464ade | 5202 | static bool |
f4836ba9 PA |
5203 | handle_no_resumed (struct execution_control_state *ecs) |
5204 | { | |
3b12939d | 5205 | if (target_can_async_p ()) |
f4836ba9 | 5206 | { |
c4464ade | 5207 | bool any_sync = false; |
f4836ba9 | 5208 | |
2dab0c7b | 5209 | for (ui *ui : all_uis ()) |
3b12939d PA |
5210 | { |
5211 | if (ui->prompt_state == PROMPT_BLOCKED) | |
5212 | { | |
c4464ade | 5213 | any_sync = true; |
3b12939d PA |
5214 | break; |
5215 | } | |
5216 | } | |
5217 | if (!any_sync) | |
5218 | { | |
5219 | /* There were no unwaited-for children left in the target, but, | |
5220 | we're not synchronously waiting for events either. Just | |
5221 | ignore. */ | |
5222 | ||
1eb8556f | 5223 | infrun_debug_printf ("TARGET_WAITKIND_NO_RESUMED (ignoring: bg)"); |
3b12939d | 5224 | prepare_to_wait (ecs); |
c4464ade | 5225 | return true; |
3b12939d | 5226 | } |
f4836ba9 PA |
5227 | } |
5228 | ||
5229 | /* Otherwise, if we were running a synchronous execution command, we | |
5230 | may need to cancel it and give the user back the terminal. | |
5231 | ||
5232 | In non-stop mode, the target can't tell whether we've already | |
5233 | consumed previous stop events, so it can end up sending us a | |
5234 | no-resumed event like so: | |
5235 | ||
5236 | #0 - thread 1 is left stopped | |
5237 | ||
5238 | #1 - thread 2 is resumed and hits breakpoint | |
dda83cd7 | 5239 | -> TARGET_WAITKIND_STOPPED |
f4836ba9 PA |
5240 | |
5241 | #2 - thread 3 is resumed and exits | |
dda83cd7 | 5242 | this is the last resumed thread, so |
f4836ba9 PA |
5243 | -> TARGET_WAITKIND_NO_RESUMED |
5244 | ||
5245 | #3 - gdb processes stop for thread 2 and decides to re-resume | |
dda83cd7 | 5246 | it. |
f4836ba9 PA |
5247 | |
5248 | #4 - gdb processes the TARGET_WAITKIND_NO_RESUMED event. | |
dda83cd7 | 5249 | thread 2 is now resumed, so the event should be ignored. |
f4836ba9 PA |
5250 | |
5251 | IOW, if the stop for thread 2 doesn't end a foreground command, | |
5252 | then we need to ignore the following TARGET_WAITKIND_NO_RESUMED | |
5253 | event. But it could be that the event meant that thread 2 itself | |
5254 | (or whatever other thread was the last resumed thread) exited. | |
5255 | ||
5256 | To address this we refresh the thread list and check whether we | |
5257 | have resumed threads _now_. In the example above, this removes | |
5258 | thread 3 from the thread list. If thread 2 was re-resumed, we | |
5259 | ignore this event. If we find no thread resumed, then we cancel | |
7d3badc6 PA |
5260 | the synchronous command and show "no unwaited-for " to the |
5261 | user. */ | |
f4836ba9 | 5262 | |
d6cc5d98 | 5263 | inferior *curr_inf = current_inferior (); |
7d3badc6 | 5264 | |
d6cc5d98 | 5265 | scoped_restore_current_thread restore_thread; |
1e864019 | 5266 | update_thread_list (); |
d6cc5d98 PA |
5267 | |
5268 | /* If: | |
5269 | ||
5270 | - the current target has no thread executing, and | |
5271 | - the current inferior is native, and | |
5272 | - the current inferior is the one which has the terminal, and | |
5273 | - we did nothing, | |
5274 | ||
5275 | then a Ctrl-C from this point on would remain stuck in the | |
5276 | kernel, until a thread resumes and dequeues it. That would | |
5277 | result in the GDB CLI not reacting to Ctrl-C, not able to | |
5278 | interrupt the program. To address this, if the current inferior | |
5279 | no longer has any thread executing, we give the terminal to some | |
5280 | other inferior that has at least one thread executing. */ | |
5281 | bool swap_terminal = true; | |
5282 | ||
5283 | /* Whether to ignore this TARGET_WAITKIND_NO_RESUMED event, or | |
5284 | whether to report it to the user. */ | |
5285 | bool ignore_event = false; | |
7d3badc6 PA |
5286 | |
5287 | for (thread_info *thread : all_non_exited_threads ()) | |
f4836ba9 | 5288 | { |
611841bb | 5289 | if (swap_terminal && thread->executing ()) |
d6cc5d98 PA |
5290 | { |
5291 | if (thread->inf != curr_inf) | |
5292 | { | |
5293 | target_terminal::ours (); | |
5294 | ||
5295 | switch_to_thread (thread); | |
5296 | target_terminal::inferior (); | |
5297 | } | |
5298 | swap_terminal = false; | |
5299 | } | |
5300 | ||
4d772ea2 | 5301 | if (!ignore_event && thread->resumed ()) |
f4836ba9 | 5302 | { |
7d3badc6 PA |
5303 | /* Either there were no unwaited-for children left in the |
5304 | target at some point, but there are now, or some target | |
5305 | other than the eventing one has unwaited-for children | |
5306 | left. Just ignore. */ | |
1eb8556f SM |
5307 | infrun_debug_printf ("TARGET_WAITKIND_NO_RESUMED " |
5308 | "(ignoring: found resumed)"); | |
d6cc5d98 PA |
5309 | |
5310 | ignore_event = true; | |
f4836ba9 | 5311 | } |
d6cc5d98 PA |
5312 | |
5313 | if (ignore_event && !swap_terminal) | |
5314 | break; | |
5315 | } | |
5316 | ||
5317 | if (ignore_event) | |
5318 | { | |
5319 | switch_to_inferior_no_thread (curr_inf); | |
5320 | prepare_to_wait (ecs); | |
c4464ade | 5321 | return true; |
f4836ba9 PA |
5322 | } |
5323 | ||
5324 | /* Go ahead and report the event. */ | |
c4464ade | 5325 | return false; |
f4836ba9 PA |
5326 | } |
5327 | ||
05ba8510 PA |
5328 | /* Given an execution control state that has been freshly filled in by |
5329 | an event from the inferior, figure out what it means and take | |
5330 | appropriate action. | |
5331 | ||
5332 | The alternatives are: | |
5333 | ||
22bcd14b | 5334 | 1) stop_waiting and return; to really stop and return to the |
05ba8510 PA |
5335 | debugger. |
5336 | ||
5337 | 2) keep_going and return; to wait for the next event (set | |
5338 | ecs->event_thread->stepping_over_breakpoint to 1 to single step | |
5339 | once). */ | |
c906108c | 5340 | |
ec9499be | 5341 | static void |
595915c1 | 5342 | handle_inferior_event (struct execution_control_state *ecs) |
cd0fc7c3 | 5343 | { |
595915c1 TT |
5344 | /* Make sure that all temporary struct value objects that were |
5345 | created during the handling of the event get deleted at the | |
5346 | end. */ | |
5347 | scoped_value_mark free_values; | |
5348 | ||
7dca2ea7 | 5349 | infrun_debug_printf ("%s", ecs->ws.to_string ().c_str ()); |
c29705b7 | 5350 | |
183be222 | 5351 | if (ecs->ws.kind () == TARGET_WAITKIND_IGNORE) |
28736962 PA |
5352 | { |
5353 | /* We had an event in the inferior, but we are not interested in | |
5354 | handling it at this level. The lower layers have already | |
5355 | done what needs to be done, if anything. | |
5356 | ||
5357 | One of the possible circumstances for this is when the | |
5358 | inferior produces output for the console. The inferior has | |
5359 | not stopped, and we are ignoring the event. Another possible | |
5360 | circumstance is any event which the lower level knows will be | |
5361 | reported multiple times without an intervening resume. */ | |
28736962 PA |
5362 | prepare_to_wait (ecs); |
5363 | return; | |
5364 | } | |
5365 | ||
183be222 | 5366 | if (ecs->ws.kind () == TARGET_WAITKIND_THREAD_EXITED) |
65706a29 | 5367 | { |
65706a29 PA |
5368 | prepare_to_wait (ecs); |
5369 | return; | |
5370 | } | |
5371 | ||
183be222 | 5372 | if (ecs->ws.kind () == TARGET_WAITKIND_NO_RESUMED |
f4836ba9 PA |
5373 | && handle_no_resumed (ecs)) |
5374 | return; | |
0e5bf2a8 | 5375 | |
5b6d1e4f PA |
5376 | /* Cache the last target/ptid/waitstatus. */ |
5377 | set_last_target_status (ecs->target, ecs->ptid, ecs->ws); | |
e02bc4cc | 5378 | |
ca005067 | 5379 | /* Always clear state belonging to the previous time we stopped. */ |
aa7d318d | 5380 | stop_stack_dummy = STOP_NONE; |
ca005067 | 5381 | |
183be222 | 5382 | if (ecs->ws.kind () == TARGET_WAITKIND_NO_RESUMED) |
0e5bf2a8 PA |
5383 | { |
5384 | /* No unwaited-for children left. IOW, all resumed children | |
5385 | have exited. */ | |
c4464ade | 5386 | stop_print_frame = false; |
22bcd14b | 5387 | stop_waiting (ecs); |
0e5bf2a8 PA |
5388 | return; |
5389 | } | |
5390 | ||
183be222 SM |
5391 | if (ecs->ws.kind () != TARGET_WAITKIND_EXITED |
5392 | && ecs->ws.kind () != TARGET_WAITKIND_SIGNALLED) | |
359f5fe6 | 5393 | { |
5b6d1e4f | 5394 | ecs->event_thread = find_thread_ptid (ecs->target, ecs->ptid); |
359f5fe6 PA |
5395 | /* If it's a new thread, add it to the thread database. */ |
5396 | if (ecs->event_thread == NULL) | |
5b6d1e4f | 5397 | ecs->event_thread = add_thread (ecs->target, ecs->ptid); |
c1e36e3e PA |
5398 | |
5399 | /* Disable range stepping. If the next step request could use a | |
5400 | range, this will be end up re-enabled then. */ | |
5401 | ecs->event_thread->control.may_range_step = 0; | |
359f5fe6 | 5402 | } |
88ed393a JK |
5403 | |
5404 | /* Dependent on valid ECS->EVENT_THREAD. */ | |
c272a98c | 5405 | adjust_pc_after_break (ecs->event_thread, ecs->ws); |
88ed393a JK |
5406 | |
5407 | /* Dependent on the current PC value modified by adjust_pc_after_break. */ | |
5408 | reinit_frame_cache (); | |
5409 | ||
28736962 PA |
5410 | breakpoint_retire_moribund (); |
5411 | ||
2b009048 DJ |
5412 | /* First, distinguish signals caused by the debugger from signals |
5413 | that have to do with the program's own actions. Note that | |
5414 | breakpoint insns may cause SIGTRAP or SIGILL or SIGEMT, depending | |
5415 | on the operating system version. Here we detect when a SIGILL or | |
5416 | SIGEMT is really a breakpoint and change it to SIGTRAP. We do | |
5417 | something similar for SIGSEGV, since a SIGSEGV will be generated | |
5418 | when we're trying to execute a breakpoint instruction on a | |
5419 | non-executable stack. This happens for call dummy breakpoints | |
5420 | for architectures like SPARC that place call dummies on the | |
5421 | stack. */ | |
183be222 SM |
5422 | if (ecs->ws.kind () == TARGET_WAITKIND_STOPPED |
5423 | && (ecs->ws.sig () == GDB_SIGNAL_ILL | |
5424 | || ecs->ws.sig () == GDB_SIGNAL_SEGV | |
5425 | || ecs->ws.sig () == GDB_SIGNAL_EMT)) | |
2b009048 | 5426 | { |
00431a78 | 5427 | struct regcache *regcache = get_thread_regcache (ecs->event_thread); |
de0a0249 | 5428 | |
a01bda52 | 5429 | if (breakpoint_inserted_here_p (regcache->aspace (), |
de0a0249 UW |
5430 | regcache_read_pc (regcache))) |
5431 | { | |
1eb8556f | 5432 | infrun_debug_printf ("Treating signal as SIGTRAP"); |
183be222 | 5433 | ecs->ws.set_stopped (GDB_SIGNAL_TRAP); |
de0a0249 | 5434 | } |
2b009048 DJ |
5435 | } |
5436 | ||
293b3ebc | 5437 | mark_non_executing_threads (ecs->target, ecs->ptid, ecs->ws); |
8c90c137 | 5438 | |
183be222 | 5439 | switch (ecs->ws.kind ()) |
488f131b JB |
5440 | { |
5441 | case TARGET_WAITKIND_LOADED: | |
72d383bb SM |
5442 | { |
5443 | context_switch (ecs); | |
5444 | /* Ignore gracefully during startup of the inferior, as it might | |
5445 | be the shell which has just loaded some objects, otherwise | |
5446 | add the symbols for the newly loaded objects. Also ignore at | |
5447 | the beginning of an attach or remote session; we will query | |
5448 | the full list of libraries once the connection is | |
5449 | established. */ | |
5450 | ||
5451 | stop_kind stop_soon = get_inferior_stop_soon (ecs); | |
5452 | if (stop_soon == NO_STOP_QUIETLY) | |
5453 | { | |
5454 | struct regcache *regcache; | |
edcc5120 | 5455 | |
72d383bb | 5456 | regcache = get_thread_regcache (ecs->event_thread); |
edcc5120 | 5457 | |
72d383bb | 5458 | handle_solib_event (); |
ab04a2af | 5459 | |
9279eb5c | 5460 | ecs->event_thread->set_stop_pc (regcache_read_pc (regcache)); |
72d383bb | 5461 | ecs->event_thread->control.stop_bpstat |
d37e0847 PA |
5462 | = bpstat_stop_status_nowatch (regcache->aspace (), |
5463 | ecs->event_thread->stop_pc (), | |
5464 | ecs->event_thread, ecs->ws); | |
c65d6b55 | 5465 | |
72d383bb | 5466 | if (handle_stop_requested (ecs)) |
94c57d6a | 5467 | return; |
488f131b | 5468 | |
72d383bb SM |
5469 | if (bpstat_causes_stop (ecs->event_thread->control.stop_bpstat)) |
5470 | { | |
5471 | /* A catchpoint triggered. */ | |
5472 | process_event_stop_test (ecs); | |
5473 | return; | |
5474 | } | |
55409f9d | 5475 | |
72d383bb SM |
5476 | /* If requested, stop when the dynamic linker notifies |
5477 | gdb of events. This allows the user to get control | |
5478 | and place breakpoints in initializer routines for | |
5479 | dynamically loaded objects (among other things). */ | |
1edb66d8 | 5480 | ecs->event_thread->set_stop_signal (GDB_SIGNAL_0); |
72d383bb SM |
5481 | if (stop_on_solib_events) |
5482 | { | |
5483 | /* Make sure we print "Stopped due to solib-event" in | |
5484 | normal_stop. */ | |
5485 | stop_print_frame = true; | |
b0f4b84b | 5486 | |
72d383bb SM |
5487 | stop_waiting (ecs); |
5488 | return; | |
5489 | } | |
5490 | } | |
b0f4b84b | 5491 | |
72d383bb SM |
5492 | /* If we are skipping through a shell, or through shared library |
5493 | loading that we aren't interested in, resume the program. If | |
5494 | we're running the program normally, also resume. */ | |
5495 | if (stop_soon == STOP_QUIETLY || stop_soon == NO_STOP_QUIETLY) | |
5496 | { | |
5497 | /* Loading of shared libraries might have changed breakpoint | |
5498 | addresses. Make sure new breakpoints are inserted. */ | |
5499 | if (stop_soon == NO_STOP_QUIETLY) | |
5500 | insert_breakpoints (); | |
5501 | resume (GDB_SIGNAL_0); | |
5502 | prepare_to_wait (ecs); | |
5503 | return; | |
5504 | } | |
5c09a2c5 | 5505 | |
72d383bb SM |
5506 | /* But stop if we're attaching or setting up a remote |
5507 | connection. */ | |
5508 | if (stop_soon == STOP_QUIETLY_NO_SIGSTOP | |
5509 | || stop_soon == STOP_QUIETLY_REMOTE) | |
5510 | { | |
5511 | infrun_debug_printf ("quietly stopped"); | |
5512 | stop_waiting (ecs); | |
5513 | return; | |
5514 | } | |
5515 | ||
f34652de | 5516 | internal_error (_("unhandled stop_soon: %d"), (int) stop_soon); |
72d383bb | 5517 | } |
c5aa993b | 5518 | |
488f131b | 5519 | case TARGET_WAITKIND_SPURIOUS: |
c65d6b55 PA |
5520 | if (handle_stop_requested (ecs)) |
5521 | return; | |
00431a78 | 5522 | context_switch (ecs); |
64ce06e4 | 5523 | resume (GDB_SIGNAL_0); |
488f131b JB |
5524 | prepare_to_wait (ecs); |
5525 | return; | |
c5aa993b | 5526 | |
65706a29 | 5527 | case TARGET_WAITKIND_THREAD_CREATED: |
c65d6b55 PA |
5528 | if (handle_stop_requested (ecs)) |
5529 | return; | |
00431a78 | 5530 | context_switch (ecs); |
65706a29 PA |
5531 | if (!switch_back_to_stepped_thread (ecs)) |
5532 | keep_going (ecs); | |
5533 | return; | |
5534 | ||
488f131b | 5535 | case TARGET_WAITKIND_EXITED: |
940c3c06 | 5536 | case TARGET_WAITKIND_SIGNALLED: |
18493a00 PA |
5537 | { |
5538 | /* Depending on the system, ecs->ptid may point to a thread or | |
5539 | to a process. On some targets, target_mourn_inferior may | |
5540 | need to have access to the just-exited thread. That is the | |
5541 | case of GNU/Linux's "checkpoint" support, for example. | |
5542 | Call the switch_to_xxx routine as appropriate. */ | |
5543 | thread_info *thr = find_thread_ptid (ecs->target, ecs->ptid); | |
5544 | if (thr != nullptr) | |
5545 | switch_to_thread (thr); | |
5546 | else | |
5547 | { | |
5548 | inferior *inf = find_inferior_ptid (ecs->target, ecs->ptid); | |
5549 | switch_to_inferior_no_thread (inf); | |
5550 | } | |
5551 | } | |
6c95b8df | 5552 | handle_vfork_child_exec_or_exit (0); |
223ffa71 | 5553 | target_terminal::ours (); /* Must do this before mourn anyway. */ |
488f131b | 5554 | |
0c557179 SDJ |
5555 | /* Clearing any previous state of convenience variables. */ |
5556 | clear_exit_convenience_vars (); | |
5557 | ||
183be222 | 5558 | if (ecs->ws.kind () == TARGET_WAITKIND_EXITED) |
940c3c06 PA |
5559 | { |
5560 | /* Record the exit code in the convenience variable $_exitcode, so | |
5561 | that the user can inspect this again later. */ | |
5562 | set_internalvar_integer (lookup_internalvar ("_exitcode"), | |
183be222 | 5563 | (LONGEST) ecs->ws.exit_status ()); |
940c3c06 PA |
5564 | |
5565 | /* Also record this in the inferior itself. */ | |
5566 | current_inferior ()->has_exit_code = 1; | |
183be222 | 5567 | current_inferior ()->exit_code = (LONGEST) ecs->ws.exit_status (); |
8cf64490 | 5568 | |
98eb56a4 | 5569 | /* Support the --return-child-result option. */ |
183be222 | 5570 | return_child_result_value = ecs->ws.exit_status (); |
98eb56a4 | 5571 | |
183be222 | 5572 | gdb::observers::exited.notify (ecs->ws.exit_status ()); |
940c3c06 PA |
5573 | } |
5574 | else | |
0c557179 | 5575 | { |
00431a78 | 5576 | struct gdbarch *gdbarch = current_inferior ()->gdbarch; |
0c557179 SDJ |
5577 | |
5578 | if (gdbarch_gdb_signal_to_target_p (gdbarch)) | |
5579 | { | |
5580 | /* Set the value of the internal variable $_exitsignal, | |
5581 | which holds the signal uncaught by the inferior. */ | |
5582 | set_internalvar_integer (lookup_internalvar ("_exitsignal"), | |
5583 | gdbarch_gdb_signal_to_target (gdbarch, | |
183be222 | 5584 | ecs->ws.sig ())); |
0c557179 SDJ |
5585 | } |
5586 | else | |
5587 | { | |
5588 | /* We don't have access to the target's method used for | |
5589 | converting between signal numbers (GDB's internal | |
5590 | representation <-> target's representation). | |
5591 | Therefore, we cannot do a good job at displaying this | |
5592 | information to the user. It's better to just warn | |
5593 | her about it (if infrun debugging is enabled), and | |
5594 | give up. */ | |
1eb8556f SM |
5595 | infrun_debug_printf ("Cannot fill $_exitsignal with the correct " |
5596 | "signal number."); | |
0c557179 SDJ |
5597 | } |
5598 | ||
183be222 | 5599 | gdb::observers::signal_exited.notify (ecs->ws.sig ()); |
0c557179 | 5600 | } |
8cf64490 | 5601 | |
488f131b | 5602 | gdb_flush (gdb_stdout); |
bc1e6c81 | 5603 | target_mourn_inferior (inferior_ptid); |
c4464ade | 5604 | stop_print_frame = false; |
22bcd14b | 5605 | stop_waiting (ecs); |
488f131b | 5606 | return; |
c5aa993b | 5607 | |
488f131b | 5608 | case TARGET_WAITKIND_FORKED: |
deb3b17b | 5609 | case TARGET_WAITKIND_VFORKED: |
e2d96639 YQ |
5610 | /* Check whether the inferior is displaced stepping. */ |
5611 | { | |
00431a78 | 5612 | struct regcache *regcache = get_thread_regcache (ecs->event_thread); |
ac7936df | 5613 | struct gdbarch *gdbarch = regcache->arch (); |
c0aba012 | 5614 | inferior *parent_inf = find_inferior_ptid (ecs->target, ecs->ptid); |
e2d96639 | 5615 | |
aeeb758d JB |
5616 | /* If this is a fork (child gets its own address space copy) |
5617 | and some displaced step buffers were in use at the time of | |
5618 | the fork, restore the displaced step buffer bytes in the | |
5619 | child process. | |
5620 | ||
5621 | Architectures which support displaced stepping and fork | |
5622 | events must supply an implementation of | |
5623 | gdbarch_displaced_step_restore_all_in_ptid. This is not | |
5624 | enforced during gdbarch validation to support architectures | |
5625 | which support displaced stepping but not forks. */ | |
183be222 | 5626 | if (ecs->ws.kind () == TARGET_WAITKIND_FORKED |
aeeb758d | 5627 | && gdbarch_supports_displaced_stepping (gdbarch)) |
187b041e | 5628 | gdbarch_displaced_step_restore_all_in_ptid |
183be222 | 5629 | (gdbarch, parent_inf, ecs->ws.child_ptid ()); |
c0aba012 SM |
5630 | |
5631 | /* If displaced stepping is supported, and thread ecs->ptid is | |
5632 | displaced stepping. */ | |
00431a78 | 5633 | if (displaced_step_in_progress_thread (ecs->event_thread)) |
e2d96639 | 5634 | { |
e2d96639 YQ |
5635 | struct regcache *child_regcache; |
5636 | CORE_ADDR parent_pc; | |
5637 | ||
5638 | /* GDB has got TARGET_WAITKIND_FORKED or TARGET_WAITKIND_VFORKED, | |
5639 | indicating that the displaced stepping of syscall instruction | |
5640 | has been done. Perform cleanup for parent process here. Note | |
5641 | that this operation also cleans up the child process for vfork, | |
5642 | because their pages are shared. */ | |
7def77a1 | 5643 | displaced_step_finish (ecs->event_thread, GDB_SIGNAL_TRAP); |
c2829269 PA |
5644 | /* Start a new step-over in another thread if there's one |
5645 | that needs it. */ | |
5646 | start_step_over (); | |
e2d96639 | 5647 | |
e2d96639 YQ |
5648 | /* Since the vfork/fork syscall instruction was executed in the scratchpad, |
5649 | the child's PC is also within the scratchpad. Set the child's PC | |
5650 | to the parent's PC value, which has already been fixed up. | |
5651 | FIXME: we use the parent's aspace here, although we're touching | |
5652 | the child, because the child hasn't been added to the inferior | |
5653 | list yet at this point. */ | |
5654 | ||
5655 | child_regcache | |
5b6d1e4f | 5656 | = get_thread_arch_aspace_regcache (parent_inf->process_target (), |
183be222 | 5657 | ecs->ws.child_ptid (), |
e2d96639 YQ |
5658 | gdbarch, |
5659 | parent_inf->aspace); | |
5660 | /* Read PC value of parent process. */ | |
5661 | parent_pc = regcache_read_pc (regcache); | |
5662 | ||
136821d9 SM |
5663 | displaced_debug_printf ("write child pc from %s to %s", |
5664 | paddress (gdbarch, | |
5665 | regcache_read_pc (child_regcache)), | |
5666 | paddress (gdbarch, parent_pc)); | |
e2d96639 YQ |
5667 | |
5668 | regcache_write_pc (child_regcache, parent_pc); | |
5669 | } | |
5670 | } | |
5671 | ||
00431a78 | 5672 | context_switch (ecs); |
5a2901d9 | 5673 | |
b242c3c2 PA |
5674 | /* Immediately detach breakpoints from the child before there's |
5675 | any chance of letting the user delete breakpoints from the | |
5676 | breakpoint lists. If we don't do this early, it's easy to | |
5677 | leave left over traps in the child, vis: "break foo; catch | |
5678 | fork; c; <fork>; del; c; <child calls foo>". We only follow | |
5679 | the fork on the last `continue', and by that time the | |
5680 | breakpoint at "foo" is long gone from the breakpoint table. | |
5681 | If we vforked, then we don't need to unpatch here, since both | |
5682 | parent and child are sharing the same memory pages; we'll | |
5683 | need to unpatch at follow/detach time instead to be certain | |
5684 | that new breakpoints added between catchpoint hit time and | |
5685 | vfork follow are detached. */ | |
183be222 | 5686 | if (ecs->ws.kind () != TARGET_WAITKIND_VFORKED) |
b242c3c2 | 5687 | { |
b242c3c2 PA |
5688 | /* This won't actually modify the breakpoint list, but will |
5689 | physically remove the breakpoints from the child. */ | |
183be222 | 5690 | detach_breakpoints (ecs->ws.child_ptid ()); |
b242c3c2 PA |
5691 | } |
5692 | ||
34b7e8a6 | 5693 | delete_just_stopped_threads_single_step_breakpoints (); |
d03285ec | 5694 | |
e58b0e63 PA |
5695 | /* In case the event is caught by a catchpoint, remember that |
5696 | the event is to be followed at the next resume of the thread, | |
5697 | and not immediately. */ | |
5698 | ecs->event_thread->pending_follow = ecs->ws; | |
5699 | ||
1edb66d8 SM |
5700 | ecs->event_thread->set_stop_pc |
5701 | (regcache_read_pc (get_thread_regcache (ecs->event_thread))); | |
675bf4cb | 5702 | |
16c381f0 | 5703 | ecs->event_thread->control.stop_bpstat |
d37e0847 PA |
5704 | = bpstat_stop_status_nowatch (get_current_regcache ()->aspace (), |
5705 | ecs->event_thread->stop_pc (), | |
5706 | ecs->event_thread, ecs->ws); | |
675bf4cb | 5707 | |
c65d6b55 PA |
5708 | if (handle_stop_requested (ecs)) |
5709 | return; | |
5710 | ||
ce12b012 PA |
5711 | /* If no catchpoint triggered for this, then keep going. Note |
5712 | that we're interested in knowing the bpstat actually causes a | |
5713 | stop, not just if it may explain the signal. Software | |
5714 | watchpoints, for example, always appear in the bpstat. */ | |
5715 | if (!bpstat_causes_stop (ecs->event_thread->control.stop_bpstat)) | |
04e68871 | 5716 | { |
5ab2fbf1 | 5717 | bool follow_child |
3e43a32a | 5718 | = (follow_fork_mode_string == follow_fork_mode_child); |
e58b0e63 | 5719 | |
1edb66d8 | 5720 | ecs->event_thread->set_stop_signal (GDB_SIGNAL_0); |
e58b0e63 | 5721 | |
5b6d1e4f PA |
5722 | process_stratum_target *targ |
5723 | = ecs->event_thread->inf->process_target (); | |
5724 | ||
5ab2fbf1 | 5725 | bool should_resume = follow_fork (); |
e58b0e63 | 5726 | |
5b6d1e4f PA |
5727 | /* Note that one of these may be an invalid pointer, |
5728 | depending on detach_fork. */ | |
00431a78 | 5729 | thread_info *parent = ecs->event_thread; |
183be222 | 5730 | thread_info *child = find_thread_ptid (targ, ecs->ws.child_ptid ()); |
6c95b8df | 5731 | |
a2077e25 PA |
5732 | /* At this point, the parent is marked running, and the |
5733 | child is marked stopped. */ | |
5734 | ||
5735 | /* If not resuming the parent, mark it stopped. */ | |
5736 | if (follow_child && !detach_fork && !non_stop && !sched_multi) | |
00431a78 | 5737 | parent->set_running (false); |
a2077e25 PA |
5738 | |
5739 | /* If resuming the child, mark it running. */ | |
5740 | if (follow_child || (!detach_fork && (non_stop || sched_multi))) | |
00431a78 | 5741 | child->set_running (true); |
a2077e25 | 5742 | |
6c95b8df | 5743 | /* In non-stop mode, also resume the other branch. */ |
fbea99ea PA |
5744 | if (!detach_fork && (non_stop |
5745 | || (sched_multi && target_is_non_stop_p ()))) | |
6c95b8df PA |
5746 | { |
5747 | if (follow_child) | |
5748 | switch_to_thread (parent); | |
5749 | else | |
5750 | switch_to_thread (child); | |
5751 | ||
5752 | ecs->event_thread = inferior_thread (); | |
5753 | ecs->ptid = inferior_ptid; | |
5754 | keep_going (ecs); | |
5755 | } | |
5756 | ||
5757 | if (follow_child) | |
5758 | switch_to_thread (child); | |
5759 | else | |
5760 | switch_to_thread (parent); | |
5761 | ||
e58b0e63 PA |
5762 | ecs->event_thread = inferior_thread (); |
5763 | ecs->ptid = inferior_ptid; | |
5764 | ||
5765 | if (should_resume) | |
27f9f649 SM |
5766 | { |
5767 | /* Never call switch_back_to_stepped_thread if we are waiting for | |
5768 | vfork-done (waiting for an external vfork child to exec or | |
5769 | exit). We will resume only the vforking thread for the purpose | |
5770 | of collecting the vfork-done event, and we will restart any | |
5771 | step once the critical shared address space window is done. */ | |
5772 | if ((!follow_child | |
5773 | && detach_fork | |
5774 | && parent->inf->thread_waiting_for_vfork_done != nullptr) | |
5775 | || !switch_back_to_stepped_thread (ecs)) | |
5776 | keep_going (ecs); | |
5777 | } | |
e58b0e63 | 5778 | else |
22bcd14b | 5779 | stop_waiting (ecs); |
04e68871 DJ |
5780 | return; |
5781 | } | |
94c57d6a PA |
5782 | process_event_stop_test (ecs); |
5783 | return; | |
488f131b | 5784 | |
6c95b8df PA |
5785 | case TARGET_WAITKIND_VFORK_DONE: |
5786 | /* Done with the shared memory region. Re-insert breakpoints in | |
5787 | the parent, and keep going. */ | |
5788 | ||
00431a78 | 5789 | context_switch (ecs); |
6c95b8df | 5790 | |
d8bbae6e SM |
5791 | handle_vfork_done (ecs->event_thread); |
5792 | gdb_assert (inferior_thread () == ecs->event_thread); | |
c65d6b55 PA |
5793 | |
5794 | if (handle_stop_requested (ecs)) | |
5795 | return; | |
5796 | ||
27f9f649 SM |
5797 | if (!switch_back_to_stepped_thread (ecs)) |
5798 | { | |
5799 | gdb_assert (inferior_thread () == ecs->event_thread); | |
5800 | /* This also takes care of reinserting breakpoints in the | |
5801 | previously locked inferior. */ | |
5802 | keep_going (ecs); | |
5803 | } | |
6c95b8df PA |
5804 | return; |
5805 | ||
488f131b | 5806 | case TARGET_WAITKIND_EXECD: |
488f131b | 5807 | |
cbd2b4e3 PA |
5808 | /* Note we can't read registers yet (the stop_pc), because we |
5809 | don't yet know the inferior's post-exec architecture. | |
5810 | 'stop_pc' is explicitly read below instead. */ | |
00431a78 | 5811 | switch_to_thread_no_regs (ecs->event_thread); |
5a2901d9 | 5812 | |
6c95b8df PA |
5813 | /* Do whatever is necessary to the parent branch of the vfork. */ |
5814 | handle_vfork_child_exec_or_exit (1); | |
5815 | ||
795e548f | 5816 | /* This causes the eventpoints and symbol table to be reset. |
dda83cd7 SM |
5817 | Must do this now, before trying to determine whether to |
5818 | stop. */ | |
183be222 | 5819 | follow_exec (inferior_ptid, ecs->ws.execd_pathname ()); |
795e548f | 5820 | |
17d8546e DB |
5821 | /* In follow_exec we may have deleted the original thread and |
5822 | created a new one. Make sure that the event thread is the | |
5823 | execd thread for that case (this is a nop otherwise). */ | |
5824 | ecs->event_thread = inferior_thread (); | |
5825 | ||
1edb66d8 SM |
5826 | ecs->event_thread->set_stop_pc |
5827 | (regcache_read_pc (get_thread_regcache (ecs->event_thread))); | |
ecdc3a72 | 5828 | |
16c381f0 | 5829 | ecs->event_thread->control.stop_bpstat |
d37e0847 PA |
5830 | = bpstat_stop_status_nowatch (get_current_regcache ()->aspace (), |
5831 | ecs->event_thread->stop_pc (), | |
5832 | ecs->event_thread, ecs->ws); | |
795e548f | 5833 | |
c65d6b55 PA |
5834 | if (handle_stop_requested (ecs)) |
5835 | return; | |
5836 | ||
04e68871 | 5837 | /* If no catchpoint triggered for this, then keep going. */ |
ce12b012 | 5838 | if (!bpstat_causes_stop (ecs->event_thread->control.stop_bpstat)) |
04e68871 | 5839 | { |
1edb66d8 | 5840 | ecs->event_thread->set_stop_signal (GDB_SIGNAL_0); |
04e68871 DJ |
5841 | keep_going (ecs); |
5842 | return; | |
5843 | } | |
94c57d6a PA |
5844 | process_event_stop_test (ecs); |
5845 | return; | |
488f131b | 5846 | |
b4dc5ffa | 5847 | /* Be careful not to try to gather much state about a thread |
dda83cd7 | 5848 | that's in a syscall. It's frequently a losing proposition. */ |
488f131b | 5849 | case TARGET_WAITKIND_SYSCALL_ENTRY: |
1777feb0 | 5850 | /* Getting the current syscall number. */ |
94c57d6a PA |
5851 | if (handle_syscall_event (ecs) == 0) |
5852 | process_event_stop_test (ecs); | |
5853 | return; | |
c906108c | 5854 | |
488f131b | 5855 | /* Before examining the threads further, step this thread to |
dda83cd7 SM |
5856 | get it entirely out of the syscall. (We get notice of the |
5857 | event when the thread is just on the verge of exiting a | |
5858 | syscall. Stepping one instruction seems to get it back | |
5859 | into user code.) */ | |
488f131b | 5860 | case TARGET_WAITKIND_SYSCALL_RETURN: |
94c57d6a PA |
5861 | if (handle_syscall_event (ecs) == 0) |
5862 | process_event_stop_test (ecs); | |
5863 | return; | |
c906108c | 5864 | |
488f131b | 5865 | case TARGET_WAITKIND_STOPPED: |
4f5d7f63 PA |
5866 | handle_signal_stop (ecs); |
5867 | return; | |
c906108c | 5868 | |
b2175913 MS |
5869 | case TARGET_WAITKIND_NO_HISTORY: |
5870 | /* Reverse execution: target ran out of history info. */ | |
eab402df | 5871 | |
d1988021 | 5872 | /* Switch to the stopped thread. */ |
00431a78 | 5873 | context_switch (ecs); |
1eb8556f | 5874 | infrun_debug_printf ("stopped"); |
d1988021 | 5875 | |
34b7e8a6 | 5876 | delete_just_stopped_threads_single_step_breakpoints (); |
1edb66d8 SM |
5877 | ecs->event_thread->set_stop_pc |
5878 | (regcache_read_pc (get_thread_regcache (inferior_thread ()))); | |
c65d6b55 PA |
5879 | |
5880 | if (handle_stop_requested (ecs)) | |
5881 | return; | |
5882 | ||
76727919 | 5883 | gdb::observers::no_history.notify (); |
22bcd14b | 5884 | stop_waiting (ecs); |
b2175913 | 5885 | return; |
488f131b | 5886 | } |
4f5d7f63 PA |
5887 | } |
5888 | ||
372316f1 | 5889 | /* Restart threads back to what they were trying to do back when we |
148cf134 SM |
5890 | paused them (because of an in-line step-over or vfork, for example). |
5891 | The EVENT_THREAD thread is ignored (not restarted). | |
5892 | ||
5893 | If INF is non-nullptr, only resume threads from INF. */ | |
4d9d9d04 PA |
5894 | |
5895 | static void | |
148cf134 | 5896 | restart_threads (struct thread_info *event_thread, inferior *inf) |
372316f1 | 5897 | { |
148cf134 SM |
5898 | INFRUN_SCOPED_DEBUG_START_END ("event_thread=%s, inf=%d", |
5899 | event_thread->ptid.to_string ().c_str (), | |
5900 | inf != nullptr ? inf->num : -1); | |
5901 | ||
2b718529 LS |
5902 | gdb_assert (!step_over_info_valid_p ()); |
5903 | ||
372316f1 PA |
5904 | /* In case the instruction just stepped spawned a new thread. */ |
5905 | update_thread_list (); | |
5906 | ||
08036331 | 5907 | for (thread_info *tp : all_non_exited_threads ()) |
372316f1 | 5908 | { |
148cf134 SM |
5909 | if (inf != nullptr && tp->inf != inf) |
5910 | continue; | |
5911 | ||
ac7d717c PA |
5912 | if (tp->inf->detaching) |
5913 | { | |
5914 | infrun_debug_printf ("restart threads: [%s] inferior detaching", | |
0fab7955 | 5915 | tp->ptid.to_string ().c_str ()); |
ac7d717c PA |
5916 | continue; |
5917 | } | |
5918 | ||
f3f8ece4 PA |
5919 | switch_to_thread_no_regs (tp); |
5920 | ||
372316f1 PA |
5921 | if (tp == event_thread) |
5922 | { | |
1eb8556f | 5923 | infrun_debug_printf ("restart threads: [%s] is event thread", |
0fab7955 | 5924 | tp->ptid.to_string ().c_str ()); |
372316f1 PA |
5925 | continue; |
5926 | } | |
5927 | ||
5928 | if (!(tp->state == THREAD_RUNNING || tp->control.in_infcall)) | |
5929 | { | |
1eb8556f | 5930 | infrun_debug_printf ("restart threads: [%s] not meant to be running", |
0fab7955 | 5931 | tp->ptid.to_string ().c_str ()); |
372316f1 PA |
5932 | continue; |
5933 | } | |
5934 | ||
7846f3aa | 5935 | if (tp->resumed ()) |
372316f1 | 5936 | { |
1eb8556f | 5937 | infrun_debug_printf ("restart threads: [%s] resumed", |
0fab7955 | 5938 | tp->ptid.to_string ().c_str ()); |
611841bb | 5939 | gdb_assert (tp->executing () || tp->has_pending_waitstatus ()); |
372316f1 PA |
5940 | continue; |
5941 | } | |
5942 | ||
5943 | if (thread_is_in_step_over_chain (tp)) | |
5944 | { | |
1eb8556f | 5945 | infrun_debug_printf ("restart threads: [%s] needs step-over", |
0fab7955 | 5946 | tp->ptid.to_string ().c_str ()); |
7846f3aa | 5947 | gdb_assert (!tp->resumed ()); |
372316f1 PA |
5948 | continue; |
5949 | } | |
5950 | ||
5951 | ||
1edb66d8 | 5952 | if (tp->has_pending_waitstatus ()) |
372316f1 | 5953 | { |
1eb8556f | 5954 | infrun_debug_printf ("restart threads: [%s] has pending status", |
0fab7955 | 5955 | tp->ptid.to_string ().c_str ()); |
7846f3aa | 5956 | tp->set_resumed (true); |
372316f1 PA |
5957 | continue; |
5958 | } | |
5959 | ||
c65d6b55 PA |
5960 | gdb_assert (!tp->stop_requested); |
5961 | ||
372316f1 PA |
5962 | /* If some thread needs to start a step-over at this point, it |
5963 | should still be in the step-over queue, and thus skipped | |
5964 | above. */ | |
5965 | if (thread_still_needs_step_over (tp)) | |
5966 | { | |
f34652de | 5967 | internal_error ("thread [%s] needs a step-over, but not in " |
372316f1 | 5968 | "step-over queue\n", |
0fab7955 | 5969 | tp->ptid.to_string ().c_str ()); |
372316f1 PA |
5970 | } |
5971 | ||
5972 | if (currently_stepping (tp)) | |
5973 | { | |
1eb8556f | 5974 | infrun_debug_printf ("restart threads: [%s] was stepping", |
0fab7955 | 5975 | tp->ptid.to_string ().c_str ()); |
372316f1 PA |
5976 | keep_going_stepped_thread (tp); |
5977 | } | |
5978 | else | |
5979 | { | |
5980 | struct execution_control_state ecss; | |
5981 | struct execution_control_state *ecs = &ecss; | |
5982 | ||
1eb8556f | 5983 | infrun_debug_printf ("restart threads: [%s] continuing", |
0fab7955 | 5984 | tp->ptid.to_string ().c_str ()); |
372316f1 | 5985 | reset_ecs (ecs, tp); |
00431a78 | 5986 | switch_to_thread (tp); |
372316f1 PA |
5987 | keep_going_pass_signal (ecs); |
5988 | } | |
5989 | } | |
5990 | } | |
5991 | ||
5992 | /* Callback for iterate_over_threads. Find a resumed thread that has | |
5993 | a pending waitstatus. */ | |
5994 | ||
5995 | static int | |
5996 | resumed_thread_with_pending_status (struct thread_info *tp, | |
5997 | void *arg) | |
5998 | { | |
1edb66d8 | 5999 | return tp->resumed () && tp->has_pending_waitstatus (); |
372316f1 PA |
6000 | } |
6001 | ||
6002 | /* Called when we get an event that may finish an in-line or | |
6003 | out-of-line (displaced stepping) step-over started previously. | |
6004 | Return true if the event is processed and we should go back to the | |
6005 | event loop; false if the caller should continue processing the | |
6006 | event. */ | |
6007 | ||
6008 | static int | |
4d9d9d04 PA |
6009 | finish_step_over (struct execution_control_state *ecs) |
6010 | { | |
1edb66d8 | 6011 | displaced_step_finish (ecs->event_thread, ecs->event_thread->stop_signal ()); |
4d9d9d04 | 6012 | |
c4464ade | 6013 | bool had_step_over_info = step_over_info_valid_p (); |
372316f1 PA |
6014 | |
6015 | if (had_step_over_info) | |
4d9d9d04 PA |
6016 | { |
6017 | /* If we're stepping over a breakpoint with all threads locked, | |
6018 | then only the thread that was stepped should be reporting | |
6019 | back an event. */ | |
6020 | gdb_assert (ecs->event_thread->control.trap_expected); | |
6021 | ||
c65d6b55 | 6022 | clear_step_over_info (); |
4d9d9d04 PA |
6023 | } |
6024 | ||
fbea99ea | 6025 | if (!target_is_non_stop_p ()) |
372316f1 | 6026 | return 0; |
4d9d9d04 PA |
6027 | |
6028 | /* Start a new step-over in another thread if there's one that | |
6029 | needs it. */ | |
6030 | start_step_over (); | |
372316f1 PA |
6031 | |
6032 | /* If we were stepping over a breakpoint before, and haven't started | |
6033 | a new in-line step-over sequence, then restart all other threads | |
6034 | (except the event thread). We can't do this in all-stop, as then | |
6035 | e.g., we wouldn't be able to issue any other remote packet until | |
6036 | these other threads stop. */ | |
6037 | if (had_step_over_info && !step_over_info_valid_p ()) | |
6038 | { | |
6039 | struct thread_info *pending; | |
6040 | ||
6041 | /* If we only have threads with pending statuses, the restart | |
6042 | below won't restart any thread and so nothing re-inserts the | |
6043 | breakpoint we just stepped over. But we need it inserted | |
6044 | when we later process the pending events, otherwise if | |
6045 | another thread has a pending event for this breakpoint too, | |
6046 | we'd discard its event (because the breakpoint that | |
6047 | originally caused the event was no longer inserted). */ | |
00431a78 | 6048 | context_switch (ecs); |
372316f1 PA |
6049 | insert_breakpoints (); |
6050 | ||
6051 | restart_threads (ecs->event_thread); | |
6052 | ||
6053 | /* If we have events pending, go through handle_inferior_event | |
6054 | again, picking up a pending event at random. This avoids | |
6055 | thread starvation. */ | |
6056 | ||
6057 | /* But not if we just stepped over a watchpoint in order to let | |
6058 | the instruction execute so we can evaluate its expression. | |
6059 | The set of watchpoints that triggered is recorded in the | |
6060 | breakpoint objects themselves (see bp->watchpoint_triggered). | |
6061 | If we processed another event first, that other event could | |
6062 | clobber this info. */ | |
6063 | if (ecs->event_thread->stepping_over_watchpoint) | |
6064 | return 0; | |
6065 | ||
6066 | pending = iterate_over_threads (resumed_thread_with_pending_status, | |
6067 | NULL); | |
6068 | if (pending != NULL) | |
6069 | { | |
6070 | struct thread_info *tp = ecs->event_thread; | |
6071 | struct regcache *regcache; | |
6072 | ||
1eb8556f SM |
6073 | infrun_debug_printf ("found resumed threads with " |
6074 | "pending events, saving status"); | |
372316f1 PA |
6075 | |
6076 | gdb_assert (pending != tp); | |
6077 | ||
6078 | /* Record the event thread's event for later. */ | |
c272a98c | 6079 | save_waitstatus (tp, ecs->ws); |
372316f1 PA |
6080 | /* This was cleared early, by handle_inferior_event. Set it |
6081 | so this pending event is considered by | |
6082 | do_target_wait. */ | |
7846f3aa | 6083 | tp->set_resumed (true); |
372316f1 | 6084 | |
611841bb | 6085 | gdb_assert (!tp->executing ()); |
372316f1 | 6086 | |
00431a78 | 6087 | regcache = get_thread_regcache (tp); |
1edb66d8 | 6088 | tp->set_stop_pc (regcache_read_pc (regcache)); |
372316f1 | 6089 | |
1eb8556f SM |
6090 | infrun_debug_printf ("saved stop_pc=%s for %s " |
6091 | "(currently_stepping=%d)", | |
1edb66d8 | 6092 | paddress (target_gdbarch (), tp->stop_pc ()), |
0fab7955 | 6093 | tp->ptid.to_string ().c_str (), |
1eb8556f | 6094 | currently_stepping (tp)); |
372316f1 PA |
6095 | |
6096 | /* This in-line step-over finished; clear this so we won't | |
6097 | start a new one. This is what handle_signal_stop would | |
6098 | do, if we returned false. */ | |
6099 | tp->stepping_over_breakpoint = 0; | |
6100 | ||
6101 | /* Wake up the event loop again. */ | |
6102 | mark_async_event_handler (infrun_async_inferior_event_token); | |
6103 | ||
6104 | prepare_to_wait (ecs); | |
6105 | return 1; | |
6106 | } | |
6107 | } | |
6108 | ||
6109 | return 0; | |
4d9d9d04 PA |
6110 | } |
6111 | ||
4f5d7f63 PA |
6112 | /* Come here when the program has stopped with a signal. */ |
6113 | ||
6114 | static void | |
6115 | handle_signal_stop (struct execution_control_state *ecs) | |
6116 | { | |
bd2b40ac | 6117 | frame_info_ptr frame; |
4f5d7f63 PA |
6118 | struct gdbarch *gdbarch; |
6119 | int stopped_by_watchpoint; | |
6120 | enum stop_kind stop_soon; | |
6121 | int random_signal; | |
c906108c | 6122 | |
183be222 | 6123 | gdb_assert (ecs->ws.kind () == TARGET_WAITKIND_STOPPED); |
f0407826 | 6124 | |
183be222 | 6125 | ecs->event_thread->set_stop_signal (ecs->ws.sig ()); |
c65d6b55 | 6126 | |
f0407826 DE |
6127 | /* Do we need to clean up the state of a thread that has |
6128 | completed a displaced single-step? (Doing so usually affects | |
6129 | the PC, so do it here, before we set stop_pc.) */ | |
372316f1 PA |
6130 | if (finish_step_over (ecs)) |
6131 | return; | |
f0407826 DE |
6132 | |
6133 | /* If we either finished a single-step or hit a breakpoint, but | |
6134 | the user wanted this thread to be stopped, pretend we got a | |
6135 | SIG0 (generic unsignaled stop). */ | |
6136 | if (ecs->event_thread->stop_requested | |
1edb66d8 SM |
6137 | && ecs->event_thread->stop_signal () == GDB_SIGNAL_TRAP) |
6138 | ecs->event_thread->set_stop_signal (GDB_SIGNAL_0); | |
237fc4c9 | 6139 | |
1edb66d8 SM |
6140 | ecs->event_thread->set_stop_pc |
6141 | (regcache_read_pc (get_thread_regcache (ecs->event_thread))); | |
488f131b | 6142 | |
2ab76a18 PA |
6143 | context_switch (ecs); |
6144 | ||
6145 | if (deprecated_context_hook) | |
6146 | deprecated_context_hook (ecs->event_thread->global_num); | |
6147 | ||
527159b7 | 6148 | if (debug_infrun) |
237fc4c9 | 6149 | { |
00431a78 | 6150 | struct regcache *regcache = get_thread_regcache (ecs->event_thread); |
b926417a | 6151 | struct gdbarch *reg_gdbarch = regcache->arch (); |
7f82dfc7 | 6152 | |
1edb66d8 SM |
6153 | infrun_debug_printf |
6154 | ("stop_pc=%s", paddress (reg_gdbarch, ecs->event_thread->stop_pc ())); | |
d92524f1 | 6155 | if (target_stopped_by_watchpoint ()) |
237fc4c9 | 6156 | { |
dda83cd7 | 6157 | CORE_ADDR addr; |
abbb1732 | 6158 | |
1eb8556f | 6159 | infrun_debug_printf ("stopped by watchpoint"); |
237fc4c9 | 6160 | |
328d42d8 SM |
6161 | if (target_stopped_data_address (current_inferior ()->top_target (), |
6162 | &addr)) | |
1eb8556f | 6163 | infrun_debug_printf ("stopped data address=%s", |
dda83cd7 SM |
6164 | paddress (reg_gdbarch, addr)); |
6165 | else | |
1eb8556f | 6166 | infrun_debug_printf ("(no data address available)"); |
237fc4c9 PA |
6167 | } |
6168 | } | |
527159b7 | 6169 | |
36fa8042 PA |
6170 | /* This is originated from start_remote(), start_inferior() and |
6171 | shared libraries hook functions. */ | |
00431a78 | 6172 | stop_soon = get_inferior_stop_soon (ecs); |
36fa8042 PA |
6173 | if (stop_soon == STOP_QUIETLY || stop_soon == STOP_QUIETLY_REMOTE) |
6174 | { | |
1eb8556f | 6175 | infrun_debug_printf ("quietly stopped"); |
c4464ade | 6176 | stop_print_frame = true; |
22bcd14b | 6177 | stop_waiting (ecs); |
36fa8042 PA |
6178 | return; |
6179 | } | |
6180 | ||
36fa8042 PA |
6181 | /* This originates from attach_command(). We need to overwrite |
6182 | the stop_signal here, because some kernels don't ignore a | |
6183 | SIGSTOP in a subsequent ptrace(PTRACE_CONT,SIGSTOP) call. | |
6184 | See more comments in inferior.h. On the other hand, if we | |
6185 | get a non-SIGSTOP, report it to the user - assume the backend | |
6186 | will handle the SIGSTOP if it should show up later. | |
6187 | ||
6188 | Also consider that the attach is complete when we see a | |
6189 | SIGTRAP. Some systems (e.g. Windows), and stubs supporting | |
6190 | target extended-remote report it instead of a SIGSTOP | |
6191 | (e.g. gdbserver). We already rely on SIGTRAP being our | |
6192 | signal, so this is no exception. | |
6193 | ||
6194 | Also consider that the attach is complete when we see a | |
6195 | GDB_SIGNAL_0. In non-stop mode, GDB will explicitly tell | |
6196 | the target to stop all threads of the inferior, in case the | |
6197 | low level attach operation doesn't stop them implicitly. If | |
6198 | they weren't stopped implicitly, then the stub will report a | |
6199 | GDB_SIGNAL_0, meaning: stopped for no particular reason | |
6200 | other than GDB's request. */ | |
6201 | if (stop_soon == STOP_QUIETLY_NO_SIGSTOP | |
1edb66d8 SM |
6202 | && (ecs->event_thread->stop_signal () == GDB_SIGNAL_STOP |
6203 | || ecs->event_thread->stop_signal () == GDB_SIGNAL_TRAP | |
6204 | || ecs->event_thread->stop_signal () == GDB_SIGNAL_0)) | |
36fa8042 | 6205 | { |
c4464ade | 6206 | stop_print_frame = true; |
22bcd14b | 6207 | stop_waiting (ecs); |
1edb66d8 | 6208 | ecs->event_thread->set_stop_signal (GDB_SIGNAL_0); |
36fa8042 PA |
6209 | return; |
6210 | } | |
6211 | ||
568d6575 UW |
6212 | /* At this point, get hold of the now-current thread's frame. */ |
6213 | frame = get_current_frame (); | |
6214 | gdbarch = get_frame_arch (frame); | |
6215 | ||
2adfaa28 | 6216 | /* Pull the single step breakpoints out of the target. */ |
1edb66d8 | 6217 | if (ecs->event_thread->stop_signal () == GDB_SIGNAL_TRAP) |
488f131b | 6218 | { |
af48d08f | 6219 | struct regcache *regcache; |
af48d08f | 6220 | CORE_ADDR pc; |
2adfaa28 | 6221 | |
00431a78 | 6222 | regcache = get_thread_regcache (ecs->event_thread); |
8b86c959 YQ |
6223 | const address_space *aspace = regcache->aspace (); |
6224 | ||
af48d08f | 6225 | pc = regcache_read_pc (regcache); |
34b7e8a6 | 6226 | |
af48d08f PA |
6227 | /* However, before doing so, if this single-step breakpoint was |
6228 | actually for another thread, set this thread up for moving | |
6229 | past it. */ | |
6230 | if (!thread_has_single_step_breakpoint_here (ecs->event_thread, | |
6231 | aspace, pc)) | |
6232 | { | |
6233 | if (single_step_breakpoint_inserted_here_p (aspace, pc)) | |
2adfaa28 | 6234 | { |
1eb8556f SM |
6235 | infrun_debug_printf ("[%s] hit another thread's single-step " |
6236 | "breakpoint", | |
0fab7955 | 6237 | ecs->ptid.to_string ().c_str ()); |
af48d08f PA |
6238 | ecs->hit_singlestep_breakpoint = 1; |
6239 | } | |
6240 | } | |
6241 | else | |
6242 | { | |
1eb8556f | 6243 | infrun_debug_printf ("[%s] hit its single-step breakpoint", |
0fab7955 | 6244 | ecs->ptid.to_string ().c_str ()); |
2adfaa28 | 6245 | } |
488f131b | 6246 | } |
af48d08f | 6247 | delete_just_stopped_threads_single_step_breakpoints (); |
c906108c | 6248 | |
1edb66d8 | 6249 | if (ecs->event_thread->stop_signal () == GDB_SIGNAL_TRAP |
963f9c80 PA |
6250 | && ecs->event_thread->control.trap_expected |
6251 | && ecs->event_thread->stepping_over_watchpoint) | |
d983da9c DJ |
6252 | stopped_by_watchpoint = 0; |
6253 | else | |
c272a98c | 6254 | stopped_by_watchpoint = watchpoints_triggered (ecs->ws); |
d983da9c DJ |
6255 | |
6256 | /* If necessary, step over this watchpoint. We'll be back to display | |
6257 | it in a moment. */ | |
6258 | if (stopped_by_watchpoint | |
9aed480c | 6259 | && (target_have_steppable_watchpoint () |
568d6575 | 6260 | || gdbarch_have_nonsteppable_watchpoint (gdbarch))) |
488f131b | 6261 | { |
488f131b | 6262 | /* At this point, we are stopped at an instruction which has |
dda83cd7 SM |
6263 | attempted to write to a piece of memory under control of |
6264 | a watchpoint. The instruction hasn't actually executed | |
6265 | yet. If we were to evaluate the watchpoint expression | |
6266 | now, we would get the old value, and therefore no change | |
6267 | would seem to have occurred. | |
6268 | ||
6269 | In order to make watchpoints work `right', we really need | |
6270 | to complete the memory write, and then evaluate the | |
6271 | watchpoint expression. We do this by single-stepping the | |
d983da9c DJ |
6272 | target. |
6273 | ||
7f89fd65 | 6274 | It may not be necessary to disable the watchpoint to step over |
d983da9c DJ |
6275 | it. For example, the PA can (with some kernel cooperation) |
6276 | single step over a watchpoint without disabling the watchpoint. | |
6277 | ||
6278 | It is far more common to need to disable a watchpoint to step | |
6279 | the inferior over it. If we have non-steppable watchpoints, | |
6280 | we must disable the current watchpoint; it's simplest to | |
963f9c80 PA |
6281 | disable all watchpoints. |
6282 | ||
6283 | Any breakpoint at PC must also be stepped over -- if there's | |
6284 | one, it will have already triggered before the watchpoint | |
6285 | triggered, and we either already reported it to the user, or | |
6286 | it didn't cause a stop and we called keep_going. In either | |
6287 | case, if there was a breakpoint at PC, we must be trying to | |
6288 | step past it. */ | |
6289 | ecs->event_thread->stepping_over_watchpoint = 1; | |
6290 | keep_going (ecs); | |
488f131b JB |
6291 | return; |
6292 | } | |
6293 | ||
4e1c45ea | 6294 | ecs->event_thread->stepping_over_breakpoint = 0; |
963f9c80 | 6295 | ecs->event_thread->stepping_over_watchpoint = 0; |
16c381f0 JK |
6296 | bpstat_clear (&ecs->event_thread->control.stop_bpstat); |
6297 | ecs->event_thread->control.stop_step = 0; | |
c4464ade | 6298 | stop_print_frame = true; |
488f131b | 6299 | stopped_by_random_signal = 0; |
313f3b21 | 6300 | bpstat *stop_chain = nullptr; |
488f131b | 6301 | |
edb3359d DJ |
6302 | /* Hide inlined functions starting here, unless we just performed stepi or |
6303 | nexti. After stepi and nexti, always show the innermost frame (not any | |
6304 | inline function call sites). */ | |
16c381f0 | 6305 | if (ecs->event_thread->control.step_range_end != 1) |
0574c78f | 6306 | { |
00431a78 PA |
6307 | const address_space *aspace |
6308 | = get_thread_regcache (ecs->event_thread)->aspace (); | |
0574c78f GB |
6309 | |
6310 | /* skip_inline_frames is expensive, so we avoid it if we can | |
6311 | determine that the address is one where functions cannot have | |
6312 | been inlined. This improves performance with inferiors that | |
6313 | load a lot of shared libraries, because the solib event | |
6314 | breakpoint is defined as the address of a function (i.e. not | |
6315 | inline). Note that we have to check the previous PC as well | |
6316 | as the current one to catch cases when we have just | |
6317 | single-stepped off a breakpoint prior to reinstating it. | |
6318 | Note that we're assuming that the code we single-step to is | |
6319 | not inline, but that's not definitive: there's nothing | |
6320 | preventing the event breakpoint function from containing | |
6321 | inlined code, and the single-step ending up there. If the | |
6322 | user had set a breakpoint on that inlined code, the missing | |
6323 | skip_inline_frames call would break things. Fortunately | |
6324 | that's an extremely unlikely scenario. */ | |
f2ffa92b | 6325 | if (!pc_at_non_inline_function (aspace, |
1edb66d8 | 6326 | ecs->event_thread->stop_pc (), |
c272a98c | 6327 | ecs->ws) |
1edb66d8 | 6328 | && !(ecs->event_thread->stop_signal () == GDB_SIGNAL_TRAP |
a210c238 MR |
6329 | && ecs->event_thread->control.trap_expected |
6330 | && pc_at_non_inline_function (aspace, | |
6331 | ecs->event_thread->prev_pc, | |
c272a98c | 6332 | ecs->ws))) |
1c5a993e | 6333 | { |
f2ffa92b | 6334 | stop_chain = build_bpstat_chain (aspace, |
1edb66d8 | 6335 | ecs->event_thread->stop_pc (), |
c272a98c | 6336 | ecs->ws); |
00431a78 | 6337 | skip_inline_frames (ecs->event_thread, stop_chain); |
1c5a993e MR |
6338 | |
6339 | /* Re-fetch current thread's frame in case that invalidated | |
6340 | the frame cache. */ | |
6341 | frame = get_current_frame (); | |
6342 | gdbarch = get_frame_arch (frame); | |
6343 | } | |
0574c78f | 6344 | } |
edb3359d | 6345 | |
1edb66d8 | 6346 | if (ecs->event_thread->stop_signal () == GDB_SIGNAL_TRAP |
16c381f0 | 6347 | && ecs->event_thread->control.trap_expected |
568d6575 | 6348 | && gdbarch_single_step_through_delay_p (gdbarch) |
4e1c45ea | 6349 | && currently_stepping (ecs->event_thread)) |
3352ef37 | 6350 | { |
b50d7442 | 6351 | /* We're trying to step off a breakpoint. Turns out that we're |
3352ef37 | 6352 | also on an instruction that needs to be stepped multiple |
1777feb0 | 6353 | times before it's been fully executing. E.g., architectures |
3352ef37 AC |
6354 | with a delay slot. It needs to be stepped twice, once for |
6355 | the instruction and once for the delay slot. */ | |
6356 | int step_through_delay | |
568d6575 | 6357 | = gdbarch_single_step_through_delay (gdbarch, frame); |
abbb1732 | 6358 | |
1eb8556f SM |
6359 | if (step_through_delay) |
6360 | infrun_debug_printf ("step through delay"); | |
6361 | ||
16c381f0 JK |
6362 | if (ecs->event_thread->control.step_range_end == 0 |
6363 | && step_through_delay) | |
3352ef37 AC |
6364 | { |
6365 | /* The user issued a continue when stopped at a breakpoint. | |
6366 | Set up for another trap and get out of here. */ | |
dda83cd7 SM |
6367 | ecs->event_thread->stepping_over_breakpoint = 1; |
6368 | keep_going (ecs); | |
6369 | return; | |
3352ef37 AC |
6370 | } |
6371 | else if (step_through_delay) | |
6372 | { | |
6373 | /* The user issued a step when stopped at a breakpoint. | |
6374 | Maybe we should stop, maybe we should not - the delay | |
6375 | slot *might* correspond to a line of source. In any | |
ca67fcb8 VP |
6376 | case, don't decide that here, just set |
6377 | ecs->stepping_over_breakpoint, making sure we | |
6378 | single-step again before breakpoints are re-inserted. */ | |
4e1c45ea | 6379 | ecs->event_thread->stepping_over_breakpoint = 1; |
3352ef37 AC |
6380 | } |
6381 | } | |
6382 | ||
ab04a2af TT |
6383 | /* See if there is a breakpoint/watchpoint/catchpoint/etc. that |
6384 | handles this event. */ | |
6385 | ecs->event_thread->control.stop_bpstat | |
a01bda52 | 6386 | = bpstat_stop_status (get_current_regcache ()->aspace (), |
1edb66d8 | 6387 | ecs->event_thread->stop_pc (), |
c272a98c | 6388 | ecs->event_thread, ecs->ws, stop_chain); |
db82e815 | 6389 | |
ab04a2af TT |
6390 | /* Following in case break condition called a |
6391 | function. */ | |
c4464ade | 6392 | stop_print_frame = true; |
73dd234f | 6393 | |
ab04a2af TT |
6394 | /* This is where we handle "moribund" watchpoints. Unlike |
6395 | software breakpoints traps, hardware watchpoint traps are | |
6396 | always distinguishable from random traps. If no high-level | |
6397 | watchpoint is associated with the reported stop data address | |
6398 | anymore, then the bpstat does not explain the signal --- | |
6399 | simply make sure to ignore it if `stopped_by_watchpoint' is | |
6400 | set. */ | |
6401 | ||
1edb66d8 | 6402 | if (ecs->event_thread->stop_signal () == GDB_SIGNAL_TRAP |
47591c29 | 6403 | && !bpstat_explains_signal (ecs->event_thread->control.stop_bpstat, |
427cd150 | 6404 | GDB_SIGNAL_TRAP) |
ab04a2af | 6405 | && stopped_by_watchpoint) |
1eb8556f SM |
6406 | { |
6407 | infrun_debug_printf ("no user watchpoint explains watchpoint SIGTRAP, " | |
6408 | "ignoring"); | |
6409 | } | |
73dd234f | 6410 | |
bac7d97b | 6411 | /* NOTE: cagney/2003-03-29: These checks for a random signal |
ab04a2af TT |
6412 | at one stage in the past included checks for an inferior |
6413 | function call's call dummy's return breakpoint. The original | |
6414 | comment, that went with the test, read: | |
03cebad2 | 6415 | |
ab04a2af TT |
6416 | ``End of a stack dummy. Some systems (e.g. Sony news) give |
6417 | another signal besides SIGTRAP, so check here as well as | |
6418 | above.'' | |
73dd234f | 6419 | |
ab04a2af TT |
6420 | If someone ever tries to get call dummys on a |
6421 | non-executable stack to work (where the target would stop | |
6422 | with something like a SIGSEGV), then those tests might need | |
6423 | to be re-instated. Given, however, that the tests were only | |
6424 | enabled when momentary breakpoints were not being used, I | |
6425 | suspect that it won't be the case. | |
488f131b | 6426 | |
ab04a2af TT |
6427 | NOTE: kettenis/2004-02-05: Indeed such checks don't seem to |
6428 | be necessary for call dummies on a non-executable stack on | |
6429 | SPARC. */ | |
488f131b | 6430 | |
bac7d97b | 6431 | /* See if the breakpoints module can explain the signal. */ |
47591c29 PA |
6432 | random_signal |
6433 | = !bpstat_explains_signal (ecs->event_thread->control.stop_bpstat, | |
1edb66d8 | 6434 | ecs->event_thread->stop_signal ()); |
bac7d97b | 6435 | |
1cf4d951 PA |
6436 | /* Maybe this was a trap for a software breakpoint that has since |
6437 | been removed. */ | |
6438 | if (random_signal && target_stopped_by_sw_breakpoint ()) | |
6439 | { | |
5133a315 | 6440 | if (gdbarch_program_breakpoint_here_p (gdbarch, |
1edb66d8 | 6441 | ecs->event_thread->stop_pc ())) |
1cf4d951 PA |
6442 | { |
6443 | struct regcache *regcache; | |
6444 | int decr_pc; | |
6445 | ||
6446 | /* Re-adjust PC to what the program would see if GDB was not | |
6447 | debugging it. */ | |
00431a78 | 6448 | regcache = get_thread_regcache (ecs->event_thread); |
527a273a | 6449 | decr_pc = gdbarch_decr_pc_after_break (gdbarch); |
1cf4d951 PA |
6450 | if (decr_pc != 0) |
6451 | { | |
07036511 TT |
6452 | gdb::optional<scoped_restore_tmpl<int>> |
6453 | restore_operation_disable; | |
1cf4d951 PA |
6454 | |
6455 | if (record_full_is_used ()) | |
07036511 TT |
6456 | restore_operation_disable.emplace |
6457 | (record_full_gdb_operation_disable_set ()); | |
1cf4d951 | 6458 | |
f2ffa92b | 6459 | regcache_write_pc (regcache, |
1edb66d8 | 6460 | ecs->event_thread->stop_pc () + decr_pc); |
1cf4d951 PA |
6461 | } |
6462 | } | |
6463 | else | |
6464 | { | |
6465 | /* A delayed software breakpoint event. Ignore the trap. */ | |
1eb8556f | 6466 | infrun_debug_printf ("delayed software breakpoint trap, ignoring"); |
1cf4d951 PA |
6467 | random_signal = 0; |
6468 | } | |
6469 | } | |
6470 | ||
6471 | /* Maybe this was a trap for a hardware breakpoint/watchpoint that | |
6472 | has since been removed. */ | |
6473 | if (random_signal && target_stopped_by_hw_breakpoint ()) | |
6474 | { | |
6475 | /* A delayed hardware breakpoint event. Ignore the trap. */ | |
1eb8556f SM |
6476 | infrun_debug_printf ("delayed hardware breakpoint/watchpoint " |
6477 | "trap, ignoring"); | |
1cf4d951 PA |
6478 | random_signal = 0; |
6479 | } | |
6480 | ||
bac7d97b PA |
6481 | /* If not, perhaps stepping/nexting can. */ |
6482 | if (random_signal) | |
1edb66d8 | 6483 | random_signal = !(ecs->event_thread->stop_signal () == GDB_SIGNAL_TRAP |
bac7d97b | 6484 | && currently_stepping (ecs->event_thread)); |
ab04a2af | 6485 | |
2adfaa28 PA |
6486 | /* Perhaps the thread hit a single-step breakpoint of _another_ |
6487 | thread. Single-step breakpoints are transparent to the | |
6488 | breakpoints module. */ | |
6489 | if (random_signal) | |
6490 | random_signal = !ecs->hit_singlestep_breakpoint; | |
6491 | ||
bac7d97b PA |
6492 | /* No? Perhaps we got a moribund watchpoint. */ |
6493 | if (random_signal) | |
6494 | random_signal = !stopped_by_watchpoint; | |
ab04a2af | 6495 | |
c65d6b55 PA |
6496 | /* Always stop if the user explicitly requested this thread to |
6497 | remain stopped. */ | |
6498 | if (ecs->event_thread->stop_requested) | |
6499 | { | |
6500 | random_signal = 1; | |
1eb8556f | 6501 | infrun_debug_printf ("user-requested stop"); |
c65d6b55 PA |
6502 | } |
6503 | ||
488f131b JB |
6504 | /* For the program's own signals, act according to |
6505 | the signal handling tables. */ | |
6506 | ||
ce12b012 | 6507 | if (random_signal) |
488f131b JB |
6508 | { |
6509 | /* Signal not for debugging purposes. */ | |
1edb66d8 | 6510 | enum gdb_signal stop_signal = ecs->event_thread->stop_signal (); |
488f131b | 6511 | |
1eb8556f SM |
6512 | infrun_debug_printf ("random signal (%s)", |
6513 | gdb_signal_to_symbol_string (stop_signal)); | |
527159b7 | 6514 | |
488f131b JB |
6515 | stopped_by_random_signal = 1; |
6516 | ||
252fbfc8 PA |
6517 | /* Always stop on signals if we're either just gaining control |
6518 | of the program, or the user explicitly requested this thread | |
6519 | to remain stopped. */ | |
d6b48e9c | 6520 | if (stop_soon != NO_STOP_QUIETLY |
252fbfc8 | 6521 | || ecs->event_thread->stop_requested |
1edb66d8 | 6522 | || signal_stop_state (ecs->event_thread->stop_signal ())) |
488f131b | 6523 | { |
22bcd14b | 6524 | stop_waiting (ecs); |
488f131b JB |
6525 | return; |
6526 | } | |
b57bacec PA |
6527 | |
6528 | /* Notify observers the signal has "handle print" set. Note we | |
6529 | returned early above if stopping; normal_stop handles the | |
6530 | printing in that case. */ | |
1edb66d8 | 6531 | if (signal_print[ecs->event_thread->stop_signal ()]) |
b57bacec PA |
6532 | { |
6533 | /* The signal table tells us to print about this signal. */ | |
223ffa71 | 6534 | target_terminal::ours_for_output (); |
1edb66d8 | 6535 | gdb::observers::signal_received.notify (ecs->event_thread->stop_signal ()); |
223ffa71 | 6536 | target_terminal::inferior (); |
b57bacec | 6537 | } |
488f131b JB |
6538 | |
6539 | /* Clear the signal if it should not be passed. */ | |
1edb66d8 SM |
6540 | if (signal_program[ecs->event_thread->stop_signal ()] == 0) |
6541 | ecs->event_thread->set_stop_signal (GDB_SIGNAL_0); | |
488f131b | 6542 | |
1edb66d8 | 6543 | if (ecs->event_thread->prev_pc == ecs->event_thread->stop_pc () |
16c381f0 | 6544 | && ecs->event_thread->control.trap_expected |
8358c15c | 6545 | && ecs->event_thread->control.step_resume_breakpoint == NULL) |
68f53502 AC |
6546 | { |
6547 | /* We were just starting a new sequence, attempting to | |
6548 | single-step off of a breakpoint and expecting a SIGTRAP. | |
237fc4c9 | 6549 | Instead this signal arrives. This signal will take us out |
68f53502 AC |
6550 | of the stepping range so GDB needs to remember to, when |
6551 | the signal handler returns, resume stepping off that | |
6552 | breakpoint. */ | |
6553 | /* To simplify things, "continue" is forced to use the same | |
6554 | code paths as single-step - set a breakpoint at the | |
6555 | signal return address and then, once hit, step off that | |
6556 | breakpoint. */ | |
1eb8556f | 6557 | infrun_debug_printf ("signal arrived while stepping over breakpoint"); |
d3169d93 | 6558 | |
2c03e5be | 6559 | insert_hp_step_resume_breakpoint_at_frame (frame); |
4e1c45ea | 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; | |
d137e6dc PA |
6563 | |
6564 | /* If we were nexting/stepping some other thread, switch to | |
6565 | it, so that we don't continue it, losing control. */ | |
6566 | if (!switch_back_to_stepped_thread (ecs)) | |
6567 | keep_going (ecs); | |
9d799f85 | 6568 | return; |
68f53502 | 6569 | } |
9d799f85 | 6570 | |
1edb66d8 SM |
6571 | if (ecs->event_thread->stop_signal () != GDB_SIGNAL_0 |
6572 | && (pc_in_thread_step_range (ecs->event_thread->stop_pc (), | |
f2ffa92b | 6573 | ecs->event_thread) |
e5f8a7cc | 6574 | || ecs->event_thread->control.step_range_end == 1) |
a0cbd650 TT |
6575 | && (get_stack_frame_id (frame) |
6576 | == ecs->event_thread->control.step_stack_frame_id) | |
8358c15c | 6577 | && ecs->event_thread->control.step_resume_breakpoint == NULL) |
d303a6c7 AC |
6578 | { |
6579 | /* The inferior is about to take a signal that will take it | |
6580 | out of the single step range. Set a breakpoint at the | |
6581 | current PC (which is presumably where the signal handler | |
6582 | will eventually return) and then allow the inferior to | |
6583 | run free. | |
6584 | ||
6585 | Note that this is only needed for a signal delivered | |
6586 | while in the single-step range. Nested signals aren't a | |
6587 | problem as they eventually all return. */ | |
1eb8556f | 6588 | infrun_debug_printf ("signal may take us out of single-step range"); |
237fc4c9 | 6589 | |
372316f1 | 6590 | clear_step_over_info (); |
2c03e5be | 6591 | insert_hp_step_resume_breakpoint_at_frame (frame); |
e5f8a7cc | 6592 | ecs->event_thread->step_after_step_resume_breakpoint = 1; |
2455069d UW |
6593 | /* Reset trap_expected to ensure breakpoints are re-inserted. */ |
6594 | ecs->event_thread->control.trap_expected = 0; | |
9d799f85 AC |
6595 | keep_going (ecs); |
6596 | return; | |
d303a6c7 | 6597 | } |
9d799f85 | 6598 | |
85102364 | 6599 | /* Note: step_resume_breakpoint may be non-NULL. This occurs |
9d799f85 AC |
6600 | when either there's a nested signal, or when there's a |
6601 | pending signal enabled just as the signal handler returns | |
6602 | (leaving the inferior at the step-resume-breakpoint without | |
6603 | actually executing it). Either way continue until the | |
6604 | breakpoint is really hit. */ | |
c447ac0b PA |
6605 | |
6606 | if (!switch_back_to_stepped_thread (ecs)) | |
6607 | { | |
1eb8556f | 6608 | infrun_debug_printf ("random signal, keep going"); |
c447ac0b PA |
6609 | |
6610 | keep_going (ecs); | |
6611 | } | |
6612 | return; | |
488f131b | 6613 | } |
94c57d6a PA |
6614 | |
6615 | process_event_stop_test (ecs); | |
6616 | } | |
6617 | ||
6618 | /* Come here when we've got some debug event / signal we can explain | |
6619 | (IOW, not a random signal), and test whether it should cause a | |
6620 | stop, or whether we should resume the inferior (transparently). | |
6621 | E.g., could be a breakpoint whose condition evaluates false; we | |
6622 | could be still stepping within the line; etc. */ | |
6623 | ||
6624 | static void | |
6625 | process_event_stop_test (struct execution_control_state *ecs) | |
6626 | { | |
6627 | struct symtab_and_line stop_pc_sal; | |
bd2b40ac | 6628 | frame_info_ptr frame; |
94c57d6a | 6629 | struct gdbarch *gdbarch; |
cdaa5b73 PA |
6630 | CORE_ADDR jmp_buf_pc; |
6631 | struct bpstat_what what; | |
94c57d6a | 6632 | |
cdaa5b73 | 6633 | /* Handle cases caused by hitting a breakpoint. */ |
611c83ae | 6634 | |
cdaa5b73 PA |
6635 | frame = get_current_frame (); |
6636 | gdbarch = get_frame_arch (frame); | |
fcf3daef | 6637 | |
cdaa5b73 | 6638 | what = bpstat_what (ecs->event_thread->control.stop_bpstat); |
611c83ae | 6639 | |
cdaa5b73 PA |
6640 | if (what.call_dummy) |
6641 | { | |
6642 | stop_stack_dummy = what.call_dummy; | |
6643 | } | |
186c406b | 6644 | |
243a9253 PA |
6645 | /* A few breakpoint types have callbacks associated (e.g., |
6646 | bp_jit_event). Run them now. */ | |
6647 | bpstat_run_callbacks (ecs->event_thread->control.stop_bpstat); | |
6648 | ||
cdaa5b73 PA |
6649 | /* If we hit an internal event that triggers symbol changes, the |
6650 | current frame will be invalidated within bpstat_what (e.g., if we | |
6651 | hit an internal solib event). Re-fetch it. */ | |
6652 | frame = get_current_frame (); | |
6653 | gdbarch = get_frame_arch (frame); | |
e2e4d78b | 6654 | |
cdaa5b73 PA |
6655 | switch (what.main_action) |
6656 | { | |
6657 | case BPSTAT_WHAT_SET_LONGJMP_RESUME: | |
6658 | /* If we hit the breakpoint at longjmp while stepping, we | |
6659 | install a momentary breakpoint at the target of the | |
6660 | jmp_buf. */ | |
186c406b | 6661 | |
1eb8556f | 6662 | infrun_debug_printf ("BPSTAT_WHAT_SET_LONGJMP_RESUME"); |
186c406b | 6663 | |
cdaa5b73 | 6664 | ecs->event_thread->stepping_over_breakpoint = 1; |
611c83ae | 6665 | |
cdaa5b73 PA |
6666 | if (what.is_longjmp) |
6667 | { | |
6668 | struct value *arg_value; | |
6669 | ||
6670 | /* If we set the longjmp breakpoint via a SystemTap probe, | |
6671 | then use it to extract the arguments. The destination PC | |
6672 | is the third argument to the probe. */ | |
6673 | arg_value = probe_safe_evaluate_at_pc (frame, 2); | |
6674 | if (arg_value) | |
8fa0c4f8 AA |
6675 | { |
6676 | jmp_buf_pc = value_as_address (arg_value); | |
6677 | jmp_buf_pc = gdbarch_addr_bits_remove (gdbarch, jmp_buf_pc); | |
6678 | } | |
cdaa5b73 PA |
6679 | else if (!gdbarch_get_longjmp_target_p (gdbarch) |
6680 | || !gdbarch_get_longjmp_target (gdbarch, | |
6681 | frame, &jmp_buf_pc)) | |
e2e4d78b | 6682 | { |
1eb8556f SM |
6683 | infrun_debug_printf ("BPSTAT_WHAT_SET_LONGJMP_RESUME " |
6684 | "(!gdbarch_get_longjmp_target)"); | |
cdaa5b73 PA |
6685 | keep_going (ecs); |
6686 | return; | |
e2e4d78b | 6687 | } |
e2e4d78b | 6688 | |
cdaa5b73 PA |
6689 | /* Insert a breakpoint at resume address. */ |
6690 | insert_longjmp_resume_breakpoint (gdbarch, jmp_buf_pc); | |
6691 | } | |
6692 | else | |
6693 | check_exception_resume (ecs, frame); | |
6694 | keep_going (ecs); | |
6695 | return; | |
e81a37f7 | 6696 | |
cdaa5b73 PA |
6697 | case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME: |
6698 | { | |
bd2b40ac | 6699 | frame_info_ptr init_frame; |
e81a37f7 | 6700 | |
cdaa5b73 | 6701 | /* There are several cases to consider. |
c906108c | 6702 | |
cdaa5b73 PA |
6703 | 1. The initiating frame no longer exists. In this case we |
6704 | must stop, because the exception or longjmp has gone too | |
6705 | far. | |
2c03e5be | 6706 | |
cdaa5b73 PA |
6707 | 2. The initiating frame exists, and is the same as the |
6708 | current frame. We stop, because the exception or longjmp | |
6709 | has been caught. | |
2c03e5be | 6710 | |
cdaa5b73 PA |
6711 | 3. The initiating frame exists and is different from the |
6712 | current frame. This means the exception or longjmp has | |
6713 | been caught beneath the initiating frame, so keep going. | |
c906108c | 6714 | |
cdaa5b73 PA |
6715 | 4. longjmp breakpoint has been placed just to protect |
6716 | against stale dummy frames and user is not interested in | |
6717 | stopping around longjmps. */ | |
c5aa993b | 6718 | |
1eb8556f | 6719 | infrun_debug_printf ("BPSTAT_WHAT_CLEAR_LONGJMP_RESUME"); |
c5aa993b | 6720 | |
cdaa5b73 PA |
6721 | gdb_assert (ecs->event_thread->control.exception_resume_breakpoint |
6722 | != NULL); | |
6723 | delete_exception_resume_breakpoint (ecs->event_thread); | |
c5aa993b | 6724 | |
cdaa5b73 PA |
6725 | if (what.is_longjmp) |
6726 | { | |
b67a2c6f | 6727 | check_longjmp_breakpoint_for_call_dummy (ecs->event_thread); |
c5aa993b | 6728 | |
cdaa5b73 | 6729 | if (!frame_id_p (ecs->event_thread->initiating_frame)) |
e5ef252a | 6730 | { |
cdaa5b73 PA |
6731 | /* Case 4. */ |
6732 | keep_going (ecs); | |
6733 | return; | |
e5ef252a | 6734 | } |
cdaa5b73 | 6735 | } |
c5aa993b | 6736 | |
cdaa5b73 | 6737 | init_frame = frame_find_by_id (ecs->event_thread->initiating_frame); |
527159b7 | 6738 | |
cdaa5b73 PA |
6739 | if (init_frame) |
6740 | { | |
6741 | struct frame_id current_id | |
6742 | = get_frame_id (get_current_frame ()); | |
a0cbd650 | 6743 | if (current_id == ecs->event_thread->initiating_frame) |
cdaa5b73 PA |
6744 | { |
6745 | /* Case 2. Fall through. */ | |
6746 | } | |
6747 | else | |
6748 | { | |
6749 | /* Case 3. */ | |
6750 | keep_going (ecs); | |
6751 | return; | |
6752 | } | |
68f53502 | 6753 | } |
488f131b | 6754 | |
cdaa5b73 PA |
6755 | /* For Cases 1 and 2, remove the step-resume breakpoint, if it |
6756 | exists. */ | |
6757 | delete_step_resume_breakpoint (ecs->event_thread); | |
e5ef252a | 6758 | |
bdc36728 | 6759 | end_stepping_range (ecs); |
cdaa5b73 PA |
6760 | } |
6761 | return; | |
e5ef252a | 6762 | |
cdaa5b73 | 6763 | case BPSTAT_WHAT_SINGLE: |
1eb8556f | 6764 | infrun_debug_printf ("BPSTAT_WHAT_SINGLE"); |
cdaa5b73 PA |
6765 | ecs->event_thread->stepping_over_breakpoint = 1; |
6766 | /* Still need to check other stuff, at least the case where we | |
6767 | are stepping and step out of the right range. */ | |
6768 | break; | |
e5ef252a | 6769 | |
cdaa5b73 | 6770 | case BPSTAT_WHAT_STEP_RESUME: |
1eb8556f | 6771 | infrun_debug_printf ("BPSTAT_WHAT_STEP_RESUME"); |
e5ef252a | 6772 | |
cdaa5b73 PA |
6773 | delete_step_resume_breakpoint (ecs->event_thread); |
6774 | if (ecs->event_thread->control.proceed_to_finish | |
6775 | && execution_direction == EXEC_REVERSE) | |
6776 | { | |
6777 | struct thread_info *tp = ecs->event_thread; | |
6778 | ||
6779 | /* We are finishing a function in reverse, and just hit the | |
6780 | step-resume breakpoint at the start address of the | |
6781 | function, and we're almost there -- just need to back up | |
6782 | by one more single-step, which should take us back to the | |
6783 | function call. */ | |
6784 | tp->control.step_range_start = tp->control.step_range_end = 1; | |
6785 | keep_going (ecs); | |
e5ef252a | 6786 | return; |
cdaa5b73 PA |
6787 | } |
6788 | fill_in_stop_func (gdbarch, ecs); | |
1edb66d8 | 6789 | if (ecs->event_thread->stop_pc () == ecs->stop_func_start |
cdaa5b73 PA |
6790 | && execution_direction == EXEC_REVERSE) |
6791 | { | |
6792 | /* We are stepping over a function call in reverse, and just | |
6793 | hit the step-resume breakpoint at the start address of | |
6794 | the function. Go back to single-stepping, which should | |
6795 | take us back to the function call. */ | |
6796 | ecs->event_thread->stepping_over_breakpoint = 1; | |
6797 | keep_going (ecs); | |
6798 | return; | |
6799 | } | |
6800 | break; | |
e5ef252a | 6801 | |
cdaa5b73 | 6802 | case BPSTAT_WHAT_STOP_NOISY: |
1eb8556f | 6803 | infrun_debug_printf ("BPSTAT_WHAT_STOP_NOISY"); |
c4464ade | 6804 | stop_print_frame = true; |
e5ef252a | 6805 | |
33bf4c5c | 6806 | /* Assume the thread stopped for a breakpoint. We'll still check |
99619bea PA |
6807 | whether a/the breakpoint is there when the thread is next |
6808 | resumed. */ | |
6809 | ecs->event_thread->stepping_over_breakpoint = 1; | |
e5ef252a | 6810 | |
22bcd14b | 6811 | stop_waiting (ecs); |
cdaa5b73 | 6812 | return; |
e5ef252a | 6813 | |
cdaa5b73 | 6814 | case BPSTAT_WHAT_STOP_SILENT: |
1eb8556f | 6815 | infrun_debug_printf ("BPSTAT_WHAT_STOP_SILENT"); |
c4464ade | 6816 | stop_print_frame = false; |
e5ef252a | 6817 | |
33bf4c5c | 6818 | /* Assume the thread stopped for a breakpoint. We'll still check |
99619bea PA |
6819 | whether a/the breakpoint is there when the thread is next |
6820 | resumed. */ | |
6821 | ecs->event_thread->stepping_over_breakpoint = 1; | |
22bcd14b | 6822 | stop_waiting (ecs); |
cdaa5b73 PA |
6823 | return; |
6824 | ||
6825 | case BPSTAT_WHAT_HP_STEP_RESUME: | |
1eb8556f | 6826 | infrun_debug_printf ("BPSTAT_WHAT_HP_STEP_RESUME"); |
cdaa5b73 PA |
6827 | |
6828 | delete_step_resume_breakpoint (ecs->event_thread); | |
6829 | if (ecs->event_thread->step_after_step_resume_breakpoint) | |
6830 | { | |
6831 | /* Back when the step-resume breakpoint was inserted, we | |
6832 | were trying to single-step off a breakpoint. Go back to | |
6833 | doing that. */ | |
6834 | ecs->event_thread->step_after_step_resume_breakpoint = 0; | |
6835 | ecs->event_thread->stepping_over_breakpoint = 1; | |
6836 | keep_going (ecs); | |
6837 | return; | |
e5ef252a | 6838 | } |
cdaa5b73 PA |
6839 | break; |
6840 | ||
6841 | case BPSTAT_WHAT_KEEP_CHECKING: | |
6842 | break; | |
e5ef252a | 6843 | } |
c906108c | 6844 | |
af48d08f PA |
6845 | /* If we stepped a permanent breakpoint and we had a high priority |
6846 | step-resume breakpoint for the address we stepped, but we didn't | |
6847 | hit it, then we must have stepped into the signal handler. The | |
6848 | step-resume was only necessary to catch the case of _not_ | |
6849 | stepping into the handler, so delete it, and fall through to | |
6850 | checking whether the step finished. */ | |
6851 | if (ecs->event_thread->stepped_breakpoint) | |
6852 | { | |
6853 | struct breakpoint *sr_bp | |
6854 | = ecs->event_thread->control.step_resume_breakpoint; | |
6855 | ||
8d707a12 PA |
6856 | if (sr_bp != NULL |
6857 | && sr_bp->loc->permanent | |
af48d08f PA |
6858 | && sr_bp->type == bp_hp_step_resume |
6859 | && sr_bp->loc->address == ecs->event_thread->prev_pc) | |
6860 | { | |
1eb8556f | 6861 | infrun_debug_printf ("stepped permanent breakpoint, stopped in handler"); |
af48d08f PA |
6862 | delete_step_resume_breakpoint (ecs->event_thread); |
6863 | ecs->event_thread->step_after_step_resume_breakpoint = 0; | |
6864 | } | |
6865 | } | |
6866 | ||
cdaa5b73 PA |
6867 | /* We come here if we hit a breakpoint but should not stop for it. |
6868 | Possibly we also were stepping and should stop for that. So fall | |
6869 | through and test for stepping. But, if not stepping, do not | |
6870 | stop. */ | |
c906108c | 6871 | |
a7212384 UW |
6872 | /* In all-stop mode, if we're currently stepping but have stopped in |
6873 | some other thread, we need to switch back to the stepped thread. */ | |
c447ac0b PA |
6874 | if (switch_back_to_stepped_thread (ecs)) |
6875 | return; | |
776f04fa | 6876 | |
8358c15c | 6877 | if (ecs->event_thread->control.step_resume_breakpoint) |
488f131b | 6878 | { |
1eb8556f | 6879 | infrun_debug_printf ("step-resume breakpoint is inserted"); |
527159b7 | 6880 | |
488f131b | 6881 | /* Having a step-resume breakpoint overrides anything |
dda83cd7 SM |
6882 | else having to do with stepping commands until |
6883 | that breakpoint is reached. */ | |
488f131b JB |
6884 | keep_going (ecs); |
6885 | return; | |
6886 | } | |
c5aa993b | 6887 | |
16c381f0 | 6888 | if (ecs->event_thread->control.step_range_end == 0) |
488f131b | 6889 | { |
1eb8556f | 6890 | infrun_debug_printf ("no stepping, continue"); |
488f131b | 6891 | /* Likewise if we aren't even stepping. */ |
488f131b JB |
6892 | keep_going (ecs); |
6893 | return; | |
6894 | } | |
c5aa993b | 6895 | |
4b7703ad JB |
6896 | /* Re-fetch current thread's frame in case the code above caused |
6897 | the frame cache to be re-initialized, making our FRAME variable | |
6898 | a dangling pointer. */ | |
6899 | frame = get_current_frame (); | |
628fe4e4 | 6900 | gdbarch = get_frame_arch (frame); |
7e324e48 | 6901 | fill_in_stop_func (gdbarch, ecs); |
4b7703ad | 6902 | |
488f131b | 6903 | /* If stepping through a line, keep going if still within it. |
c906108c | 6904 | |
488f131b JB |
6905 | Note that step_range_end is the address of the first instruction |
6906 | beyond the step range, and NOT the address of the last instruction | |
31410e84 MS |
6907 | within it! |
6908 | ||
6909 | Note also that during reverse execution, we may be stepping | |
6910 | through a function epilogue and therefore must detect when | |
6911 | the current-frame changes in the middle of a line. */ | |
6912 | ||
1edb66d8 | 6913 | if (pc_in_thread_step_range (ecs->event_thread->stop_pc (), |
f2ffa92b | 6914 | ecs->event_thread) |
31410e84 | 6915 | && (execution_direction != EXEC_REVERSE |
a0cbd650 | 6916 | || get_frame_id (frame) == ecs->event_thread->control.step_frame_id)) |
488f131b | 6917 | { |
1eb8556f SM |
6918 | infrun_debug_printf |
6919 | ("stepping inside range [%s-%s]", | |
6920 | paddress (gdbarch, ecs->event_thread->control.step_range_start), | |
6921 | paddress (gdbarch, ecs->event_thread->control.step_range_end)); | |
b2175913 | 6922 | |
c1e36e3e PA |
6923 | /* Tentatively re-enable range stepping; `resume' disables it if |
6924 | necessary (e.g., if we're stepping over a breakpoint or we | |
6925 | have software watchpoints). */ | |
6926 | ecs->event_thread->control.may_range_step = 1; | |
6927 | ||
b2175913 MS |
6928 | /* When stepping backward, stop at beginning of line range |
6929 | (unless it's the function entry point, in which case | |
6930 | keep going back to the call point). */ | |
1edb66d8 | 6931 | CORE_ADDR stop_pc = ecs->event_thread->stop_pc (); |
16c381f0 | 6932 | if (stop_pc == ecs->event_thread->control.step_range_start |
b2175913 MS |
6933 | && stop_pc != ecs->stop_func_start |
6934 | && execution_direction == EXEC_REVERSE) | |
bdc36728 | 6935 | end_stepping_range (ecs); |
b2175913 MS |
6936 | else |
6937 | keep_going (ecs); | |
6938 | ||
488f131b JB |
6939 | return; |
6940 | } | |
c5aa993b | 6941 | |
488f131b | 6942 | /* We stepped out of the stepping range. */ |
c906108c | 6943 | |
488f131b | 6944 | /* If we are stepping at the source level and entered the runtime |
388a8562 MS |
6945 | loader dynamic symbol resolution code... |
6946 | ||
6947 | EXEC_FORWARD: we keep on single stepping until we exit the run | |
6948 | time loader code and reach the callee's address. | |
6949 | ||
6950 | EXEC_REVERSE: we've already executed the callee (backward), and | |
6951 | the runtime loader code is handled just like any other | |
6952 | undebuggable function call. Now we need only keep stepping | |
6953 | backward through the trampoline code, and that's handled further | |
6954 | down, so there is nothing for us to do here. */ | |
6955 | ||
6956 | if (execution_direction != EXEC_REVERSE | |
16c381f0 | 6957 | && ecs->event_thread->control.step_over_calls == STEP_OVER_UNDEBUGGABLE |
be6276e0 KB |
6958 | && in_solib_dynsym_resolve_code (ecs->event_thread->stop_pc ()) |
6959 | && !in_solib_dynsym_resolve_code ( | |
6960 | ecs->event_thread->control.step_start_function->value_block () | |
6961 | ->entry_pc ())) | |
488f131b | 6962 | { |
4c8c40e6 | 6963 | CORE_ADDR pc_after_resolver = |
1edb66d8 | 6964 | gdbarch_skip_solib_resolver (gdbarch, ecs->event_thread->stop_pc ()); |
c906108c | 6965 | |
1eb8556f | 6966 | infrun_debug_printf ("stepped into dynsym resolve code"); |
527159b7 | 6967 | |
488f131b JB |
6968 | if (pc_after_resolver) |
6969 | { | |
6970 | /* Set up a step-resume breakpoint at the address | |
6971 | indicated by SKIP_SOLIB_RESOLVER. */ | |
51abb421 | 6972 | symtab_and_line sr_sal; |
488f131b | 6973 | sr_sal.pc = pc_after_resolver; |
6c95b8df | 6974 | sr_sal.pspace = get_frame_program_space (frame); |
488f131b | 6975 | |
a6d9a66e UW |
6976 | insert_step_resume_breakpoint_at_sal (gdbarch, |
6977 | sr_sal, null_frame_id); | |
c5aa993b | 6978 | } |
c906108c | 6979 | |
488f131b JB |
6980 | keep_going (ecs); |
6981 | return; | |
6982 | } | |
c906108c | 6983 | |
1d509aa6 MM |
6984 | /* Step through an indirect branch thunk. */ |
6985 | if (ecs->event_thread->control.step_over_calls != STEP_OVER_NONE | |
f2ffa92b | 6986 | && gdbarch_in_indirect_branch_thunk (gdbarch, |
1edb66d8 | 6987 | ecs->event_thread->stop_pc ())) |
1d509aa6 | 6988 | { |
1eb8556f | 6989 | infrun_debug_printf ("stepped into indirect branch thunk"); |
1d509aa6 MM |
6990 | keep_going (ecs); |
6991 | return; | |
6992 | } | |
6993 | ||
16c381f0 JK |
6994 | if (ecs->event_thread->control.step_range_end != 1 |
6995 | && (ecs->event_thread->control.step_over_calls == STEP_OVER_UNDEBUGGABLE | |
6996 | || ecs->event_thread->control.step_over_calls == STEP_OVER_ALL) | |
568d6575 | 6997 | && get_frame_type (frame) == SIGTRAMP_FRAME) |
488f131b | 6998 | { |
1eb8556f | 6999 | infrun_debug_printf ("stepped into signal trampoline"); |
42edda50 | 7000 | /* The inferior, while doing a "step" or "next", has ended up in |
dda83cd7 SM |
7001 | a signal trampoline (either by a signal being delivered or by |
7002 | the signal handler returning). Just single-step until the | |
7003 | inferior leaves the trampoline (either by calling the handler | |
7004 | or returning). */ | |
488f131b JB |
7005 | keep_going (ecs); |
7006 | return; | |
7007 | } | |
c906108c | 7008 | |
14132e89 MR |
7009 | /* If we're in the return path from a shared library trampoline, |
7010 | we want to proceed through the trampoline when stepping. */ | |
7011 | /* macro/2012-04-25: This needs to come before the subroutine | |
7012 | call check below as on some targets return trampolines look | |
7013 | like subroutine calls (MIPS16 return thunks). */ | |
7014 | if (gdbarch_in_solib_return_trampoline (gdbarch, | |
1edb66d8 | 7015 | ecs->event_thread->stop_pc (), |
f2ffa92b | 7016 | ecs->stop_func_name) |
14132e89 MR |
7017 | && ecs->event_thread->control.step_over_calls != STEP_OVER_NONE) |
7018 | { | |
7019 | /* Determine where this trampoline returns. */ | |
1edb66d8 | 7020 | CORE_ADDR stop_pc = ecs->event_thread->stop_pc (); |
f2ffa92b PA |
7021 | CORE_ADDR real_stop_pc |
7022 | = gdbarch_skip_trampoline_code (gdbarch, frame, stop_pc); | |
14132e89 | 7023 | |
1eb8556f | 7024 | infrun_debug_printf ("stepped into solib return tramp"); |
14132e89 MR |
7025 | |
7026 | /* Only proceed through if we know where it's going. */ | |
7027 | if (real_stop_pc) | |
7028 | { | |
7029 | /* And put the step-breakpoint there and go until there. */ | |
51abb421 | 7030 | symtab_and_line sr_sal; |
14132e89 MR |
7031 | sr_sal.pc = real_stop_pc; |
7032 | sr_sal.section = find_pc_overlay (sr_sal.pc); | |
7033 | sr_sal.pspace = get_frame_program_space (frame); | |
7034 | ||
7035 | /* Do not specify what the fp should be when we stop since | |
7036 | on some machines the prologue is where the new fp value | |
7037 | is established. */ | |
7038 | insert_step_resume_breakpoint_at_sal (gdbarch, | |
7039 | sr_sal, null_frame_id); | |
7040 | ||
7041 | /* Restart without fiddling with the step ranges or | |
7042 | other state. */ | |
7043 | keep_going (ecs); | |
7044 | return; | |
7045 | } | |
7046 | } | |
7047 | ||
c17eaafe DJ |
7048 | /* Check for subroutine calls. The check for the current frame |
7049 | equalling the step ID is not necessary - the check of the | |
7050 | previous frame's ID is sufficient - but it is a common case and | |
7051 | cheaper than checking the previous frame's ID. | |
14e60db5 | 7052 | |
a0cbd650 | 7053 | NOTE: frame_id::operator== will never report two invalid frame IDs as |
14e60db5 DJ |
7054 | being equal, so to get into this block, both the current and |
7055 | previous frame must have valid frame IDs. */ | |
005ca36a JB |
7056 | /* The outer_frame_id check is a heuristic to detect stepping |
7057 | through startup code. If we step over an instruction which | |
7058 | sets the stack pointer from an invalid value to a valid value, | |
7059 | we may detect that as a subroutine call from the mythical | |
7060 | "outermost" function. This could be fixed by marking | |
7061 | outermost frames as !stack_p,code_p,special_p. Then the | |
7062 | initial outermost frame, before sp was valid, would | |
a0cbd650 | 7063 | have code_addr == &_start. See the comment in frame_id::operator== |
005ca36a | 7064 | for more. */ |
a0cbd650 TT |
7065 | if ((get_stack_frame_id (frame) |
7066 | != ecs->event_thread->control.step_stack_frame_id) | |
7067 | && ((frame_unwind_caller_id (get_current_frame ()) | |
7068 | == ecs->event_thread->control.step_stack_frame_id) | |
7069 | && ((ecs->event_thread->control.step_stack_frame_id | |
7070 | != outer_frame_id) | |
885eeb5b | 7071 | || (ecs->event_thread->control.step_start_function |
1edb66d8 | 7072 | != find_pc_function (ecs->event_thread->stop_pc ()))))) |
488f131b | 7073 | { |
1edb66d8 | 7074 | CORE_ADDR stop_pc = ecs->event_thread->stop_pc (); |
95918acb | 7075 | CORE_ADDR real_stop_pc; |
8fb3e588 | 7076 | |
1eb8556f | 7077 | infrun_debug_printf ("stepped into subroutine"); |
527159b7 | 7078 | |
b7a084be | 7079 | if (ecs->event_thread->control.step_over_calls == STEP_OVER_NONE) |
95918acb AC |
7080 | { |
7081 | /* I presume that step_over_calls is only 0 when we're | |
7082 | supposed to be stepping at the assembly language level | |
7083 | ("stepi"). Just stop. */ | |
388a8562 | 7084 | /* And this works the same backward as frontward. MVS */ |
bdc36728 | 7085 | end_stepping_range (ecs); |
95918acb AC |
7086 | return; |
7087 | } | |
8fb3e588 | 7088 | |
388a8562 MS |
7089 | /* Reverse stepping through solib trampolines. */ |
7090 | ||
7091 | if (execution_direction == EXEC_REVERSE | |
16c381f0 | 7092 | && ecs->event_thread->control.step_over_calls != STEP_OVER_NONE |
388a8562 MS |
7093 | && (gdbarch_skip_trampoline_code (gdbarch, frame, stop_pc) |
7094 | || (ecs->stop_func_start == 0 | |
7095 | && in_solib_dynsym_resolve_code (stop_pc)))) | |
7096 | { | |
7097 | /* Any solib trampoline code can be handled in reverse | |
7098 | by simply continuing to single-step. We have already | |
7099 | executed the solib function (backwards), and a few | |
7100 | steps will take us back through the trampoline to the | |
7101 | caller. */ | |
7102 | keep_going (ecs); | |
7103 | return; | |
7104 | } | |
7105 | ||
16c381f0 | 7106 | if (ecs->event_thread->control.step_over_calls == STEP_OVER_ALL) |
8567c30f | 7107 | { |
b2175913 MS |
7108 | /* We're doing a "next". |
7109 | ||
7110 | Normal (forward) execution: set a breakpoint at the | |
7111 | callee's return address (the address at which the caller | |
7112 | will resume). | |
7113 | ||
7114 | Reverse (backward) execution. set the step-resume | |
7115 | breakpoint at the start of the function that we just | |
7116 | stepped into (backwards), and continue to there. When we | |
6130d0b7 | 7117 | get there, we'll need to single-step back to the caller. */ |
b2175913 MS |
7118 | |
7119 | if (execution_direction == EXEC_REVERSE) | |
7120 | { | |
acf9414f JK |
7121 | /* If we're already at the start of the function, we've either |
7122 | just stepped backward into a single instruction function, | |
7123 | or stepped back out of a signal handler to the first instruction | |
7124 | of the function. Just keep going, which will single-step back | |
7125 | to the caller. */ | |
58c48e72 | 7126 | if (ecs->stop_func_start != stop_pc && ecs->stop_func_start != 0) |
acf9414f | 7127 | { |
acf9414f | 7128 | /* Normal function call return (static or dynamic). */ |
51abb421 | 7129 | symtab_and_line sr_sal; |
acf9414f JK |
7130 | sr_sal.pc = ecs->stop_func_start; |
7131 | sr_sal.pspace = get_frame_program_space (frame); | |
7132 | insert_step_resume_breakpoint_at_sal (gdbarch, | |
7133 | sr_sal, null_frame_id); | |
7134 | } | |
b2175913 MS |
7135 | } |
7136 | else | |
568d6575 | 7137 | insert_step_resume_breakpoint_at_caller (frame); |
b2175913 | 7138 | |
8567c30f AC |
7139 | keep_going (ecs); |
7140 | return; | |
7141 | } | |
a53c66de | 7142 | |
95918acb | 7143 | /* If we are in a function call trampoline (a stub between the |
dda83cd7 SM |
7144 | calling routine and the real function), locate the real |
7145 | function. That's what tells us (a) whether we want to step | |
7146 | into it at all, and (b) what prologue we want to run to the | |
7147 | end of, if we do step into it. */ | |
568d6575 | 7148 | real_stop_pc = skip_language_trampoline (frame, stop_pc); |
95918acb | 7149 | if (real_stop_pc == 0) |
568d6575 | 7150 | real_stop_pc = gdbarch_skip_trampoline_code (gdbarch, frame, stop_pc); |
95918acb AC |
7151 | if (real_stop_pc != 0) |
7152 | ecs->stop_func_start = real_stop_pc; | |
8fb3e588 | 7153 | |
db5f024e | 7154 | if (real_stop_pc != 0 && in_solib_dynsym_resolve_code (real_stop_pc)) |
1b2bfbb9 | 7155 | { |
51abb421 | 7156 | symtab_and_line sr_sal; |
1b2bfbb9 | 7157 | sr_sal.pc = ecs->stop_func_start; |
6c95b8df | 7158 | sr_sal.pspace = get_frame_program_space (frame); |
1b2bfbb9 | 7159 | |
a6d9a66e UW |
7160 | insert_step_resume_breakpoint_at_sal (gdbarch, |
7161 | sr_sal, null_frame_id); | |
8fb3e588 AC |
7162 | keep_going (ecs); |
7163 | return; | |
1b2bfbb9 RC |
7164 | } |
7165 | ||
95918acb | 7166 | /* If we have line number information for the function we are |
1bfeeb0f JL |
7167 | thinking of stepping into and the function isn't on the skip |
7168 | list, step into it. | |
95918acb | 7169 | |
dda83cd7 SM |
7170 | If there are several symtabs at that PC (e.g. with include |
7171 | files), just want to know whether *any* of them have line | |
7172 | numbers. find_pc_line handles this. */ | |
95918acb AC |
7173 | { |
7174 | struct symtab_and_line tmp_sal; | |
8fb3e588 | 7175 | |
95918acb | 7176 | tmp_sal = find_pc_line (ecs->stop_func_start, 0); |
2b914b52 | 7177 | if (tmp_sal.line != 0 |
85817405 | 7178 | && !function_name_is_marked_for_skip (ecs->stop_func_name, |
4a4c04f1 BE |
7179 | tmp_sal) |
7180 | && !inline_frame_is_marked_for_skip (true, ecs->event_thread)) | |
95918acb | 7181 | { |
b2175913 | 7182 | if (execution_direction == EXEC_REVERSE) |
568d6575 | 7183 | handle_step_into_function_backward (gdbarch, ecs); |
b2175913 | 7184 | else |
568d6575 | 7185 | handle_step_into_function (gdbarch, ecs); |
95918acb AC |
7186 | return; |
7187 | } | |
7188 | } | |
7189 | ||
7190 | /* If we have no line number and the step-stop-if-no-debug is | |
dda83cd7 SM |
7191 | set, we stop the step so that the user has a chance to switch |
7192 | in assembly mode. */ | |
16c381f0 | 7193 | if (ecs->event_thread->control.step_over_calls == STEP_OVER_UNDEBUGGABLE |
078130d0 | 7194 | && step_stop_if_no_debug) |
95918acb | 7195 | { |
bdc36728 | 7196 | end_stepping_range (ecs); |
95918acb AC |
7197 | return; |
7198 | } | |
7199 | ||
b2175913 MS |
7200 | if (execution_direction == EXEC_REVERSE) |
7201 | { | |
acf9414f JK |
7202 | /* If we're already at the start of the function, we've either just |
7203 | stepped backward into a single instruction function without line | |
7204 | number info, or stepped back out of a signal handler to the first | |
7205 | instruction of the function without line number info. Just keep | |
7206 | going, which will single-step back to the caller. */ | |
7207 | if (ecs->stop_func_start != stop_pc) | |
7208 | { | |
7209 | /* Set a breakpoint at callee's start address. | |
7210 | From there we can step once and be back in the caller. */ | |
51abb421 | 7211 | symtab_and_line sr_sal; |
acf9414f JK |
7212 | sr_sal.pc = ecs->stop_func_start; |
7213 | sr_sal.pspace = get_frame_program_space (frame); | |
7214 | insert_step_resume_breakpoint_at_sal (gdbarch, | |
7215 | sr_sal, null_frame_id); | |
7216 | } | |
b2175913 MS |
7217 | } |
7218 | else | |
7219 | /* Set a breakpoint at callee's return address (the address | |
7220 | at which the caller will resume). */ | |
568d6575 | 7221 | insert_step_resume_breakpoint_at_caller (frame); |
b2175913 | 7222 | |
95918acb | 7223 | keep_going (ecs); |
488f131b | 7224 | return; |
488f131b | 7225 | } |
c906108c | 7226 | |
fdd654f3 MS |
7227 | /* Reverse stepping through solib trampolines. */ |
7228 | ||
7229 | if (execution_direction == EXEC_REVERSE | |
16c381f0 | 7230 | && ecs->event_thread->control.step_over_calls != STEP_OVER_NONE) |
fdd654f3 | 7231 | { |
1edb66d8 | 7232 | CORE_ADDR stop_pc = ecs->event_thread->stop_pc (); |
f2ffa92b | 7233 | |
fdd654f3 MS |
7234 | if (gdbarch_skip_trampoline_code (gdbarch, frame, stop_pc) |
7235 | || (ecs->stop_func_start == 0 | |
7236 | && in_solib_dynsym_resolve_code (stop_pc))) | |
7237 | { | |
7238 | /* Any solib trampoline code can be handled in reverse | |
7239 | by simply continuing to single-step. We have already | |
7240 | executed the solib function (backwards), and a few | |
7241 | steps will take us back through the trampoline to the | |
7242 | caller. */ | |
7243 | keep_going (ecs); | |
7244 | return; | |
7245 | } | |
7246 | else if (in_solib_dynsym_resolve_code (stop_pc)) | |
7247 | { | |
7248 | /* Stepped backward into the solib dynsym resolver. | |
7249 | Set a breakpoint at its start and continue, then | |
7250 | one more step will take us out. */ | |
51abb421 | 7251 | symtab_and_line sr_sal; |
fdd654f3 | 7252 | sr_sal.pc = ecs->stop_func_start; |
9d1807c3 | 7253 | sr_sal.pspace = get_frame_program_space (frame); |
fdd654f3 MS |
7254 | insert_step_resume_breakpoint_at_sal (gdbarch, |
7255 | sr_sal, null_frame_id); | |
7256 | keep_going (ecs); | |
7257 | return; | |
7258 | } | |
7259 | } | |
7260 | ||
8c95582d AB |
7261 | /* This always returns the sal for the inner-most frame when we are in a |
7262 | stack of inlined frames, even if GDB actually believes that it is in a | |
7263 | more outer frame. This is checked for below by calls to | |
7264 | inline_skipped_frames. */ | |
1edb66d8 | 7265 | stop_pc_sal = find_pc_line (ecs->event_thread->stop_pc (), 0); |
7ed0fe66 | 7266 | |
1b2bfbb9 RC |
7267 | /* NOTE: tausq/2004-05-24: This if block used to be done before all |
7268 | the trampoline processing logic, however, there are some trampolines | |
7269 | that have no names, so we should do trampoline handling first. */ | |
16c381f0 | 7270 | if (ecs->event_thread->control.step_over_calls == STEP_OVER_UNDEBUGGABLE |
7ed0fe66 | 7271 | && ecs->stop_func_name == NULL |
2afb61aa | 7272 | && stop_pc_sal.line == 0) |
1b2bfbb9 | 7273 | { |
1eb8556f | 7274 | infrun_debug_printf ("stepped into undebuggable function"); |
527159b7 | 7275 | |
1b2bfbb9 | 7276 | /* The inferior just stepped into, or returned to, an |
dda83cd7 SM |
7277 | undebuggable function (where there is no debugging information |
7278 | and no line number corresponding to the address where the | |
7279 | inferior stopped). Since we want to skip this kind of code, | |
7280 | we keep going until the inferior returns from this | |
7281 | function - unless the user has asked us not to (via | |
7282 | set step-mode) or we no longer know how to get back | |
7283 | to the call site. */ | |
14e60db5 | 7284 | if (step_stop_if_no_debug |
c7ce8faa | 7285 | || !frame_id_p (frame_unwind_caller_id (frame))) |
1b2bfbb9 RC |
7286 | { |
7287 | /* If we have no line number and the step-stop-if-no-debug | |
7288 | is set, we stop the step so that the user has a chance to | |
7289 | switch in assembly mode. */ | |
bdc36728 | 7290 | end_stepping_range (ecs); |
1b2bfbb9 RC |
7291 | return; |
7292 | } | |
7293 | else | |
7294 | { | |
7295 | /* Set a breakpoint at callee's return address (the address | |
7296 | at which the caller will resume). */ | |
568d6575 | 7297 | insert_step_resume_breakpoint_at_caller (frame); |
1b2bfbb9 RC |
7298 | keep_going (ecs); |
7299 | return; | |
7300 | } | |
7301 | } | |
7302 | ||
16c381f0 | 7303 | if (ecs->event_thread->control.step_range_end == 1) |
1b2bfbb9 RC |
7304 | { |
7305 | /* It is stepi or nexti. We always want to stop stepping after | |
dda83cd7 | 7306 | one instruction. */ |
1eb8556f | 7307 | infrun_debug_printf ("stepi/nexti"); |
bdc36728 | 7308 | end_stepping_range (ecs); |
1b2bfbb9 RC |
7309 | return; |
7310 | } | |
7311 | ||
2afb61aa | 7312 | if (stop_pc_sal.line == 0) |
488f131b JB |
7313 | { |
7314 | /* We have no line number information. That means to stop | |
dda83cd7 SM |
7315 | stepping (does this always happen right after one instruction, |
7316 | when we do "s" in a function with no line numbers, | |
7317 | or can this happen as a result of a return or longjmp?). */ | |
1eb8556f | 7318 | infrun_debug_printf ("line number info"); |
bdc36728 | 7319 | end_stepping_range (ecs); |
488f131b JB |
7320 | return; |
7321 | } | |
c906108c | 7322 | |
edb3359d DJ |
7323 | /* Look for "calls" to inlined functions, part one. If the inline |
7324 | frame machinery detected some skipped call sites, we have entered | |
7325 | a new inline function. */ | |
7326 | ||
a0cbd650 TT |
7327 | if ((get_frame_id (get_current_frame ()) |
7328 | == ecs->event_thread->control.step_frame_id) | |
00431a78 | 7329 | && inline_skipped_frames (ecs->event_thread)) |
edb3359d | 7330 | { |
1eb8556f | 7331 | infrun_debug_printf ("stepped into inlined function"); |
edb3359d | 7332 | |
51abb421 | 7333 | symtab_and_line call_sal = find_frame_sal (get_current_frame ()); |
edb3359d | 7334 | |
16c381f0 | 7335 | if (ecs->event_thread->control.step_over_calls != STEP_OVER_ALL) |
edb3359d DJ |
7336 | { |
7337 | /* For "step", we're going to stop. But if the call site | |
7338 | for this inlined function is on the same source line as | |
7339 | we were previously stepping, go down into the function | |
7340 | first. Otherwise stop at the call site. */ | |
7341 | ||
7342 | if (call_sal.line == ecs->event_thread->current_line | |
7343 | && call_sal.symtab == ecs->event_thread->current_symtab) | |
4a4c04f1 BE |
7344 | { |
7345 | step_into_inline_frame (ecs->event_thread); | |
7346 | if (inline_frame_is_marked_for_skip (false, ecs->event_thread)) | |
7347 | { | |
7348 | keep_going (ecs); | |
7349 | return; | |
7350 | } | |
7351 | } | |
edb3359d | 7352 | |
bdc36728 | 7353 | end_stepping_range (ecs); |
edb3359d DJ |
7354 | return; |
7355 | } | |
7356 | else | |
7357 | { | |
7358 | /* For "next", we should stop at the call site if it is on a | |
7359 | different source line. Otherwise continue through the | |
7360 | inlined function. */ | |
7361 | if (call_sal.line == ecs->event_thread->current_line | |
7362 | && call_sal.symtab == ecs->event_thread->current_symtab) | |
7363 | keep_going (ecs); | |
7364 | else | |
bdc36728 | 7365 | end_stepping_range (ecs); |
edb3359d DJ |
7366 | return; |
7367 | } | |
7368 | } | |
7369 | ||
7370 | /* Look for "calls" to inlined functions, part two. If we are still | |
7371 | in the same real function we were stepping through, but we have | |
7372 | to go further up to find the exact frame ID, we are stepping | |
7373 | through a more inlined call beyond its call site. */ | |
7374 | ||
7375 | if (get_frame_type (get_current_frame ()) == INLINE_FRAME | |
a0cbd650 TT |
7376 | && (get_frame_id (get_current_frame ()) |
7377 | != ecs->event_thread->control.step_frame_id) | |
edb3359d | 7378 | && stepped_in_from (get_current_frame (), |
16c381f0 | 7379 | ecs->event_thread->control.step_frame_id)) |
edb3359d | 7380 | { |
1eb8556f | 7381 | infrun_debug_printf ("stepping through inlined function"); |
edb3359d | 7382 | |
4a4c04f1 BE |
7383 | if (ecs->event_thread->control.step_over_calls == STEP_OVER_ALL |
7384 | || inline_frame_is_marked_for_skip (false, ecs->event_thread)) | |
edb3359d DJ |
7385 | keep_going (ecs); |
7386 | else | |
bdc36728 | 7387 | end_stepping_range (ecs); |
edb3359d DJ |
7388 | return; |
7389 | } | |
7390 | ||
8c95582d | 7391 | bool refresh_step_info = true; |
1edb66d8 | 7392 | if ((ecs->event_thread->stop_pc () == stop_pc_sal.pc) |
4e1c45ea | 7393 | && (ecs->event_thread->current_line != stop_pc_sal.line |
24b21115 | 7394 | || ecs->event_thread->current_symtab != stop_pc_sal.symtab)) |
488f131b | 7395 | { |
ebde6f2d TV |
7396 | /* We are at a different line. */ |
7397 | ||
8c95582d AB |
7398 | if (stop_pc_sal.is_stmt) |
7399 | { | |
ebde6f2d TV |
7400 | /* We are at the start of a statement. |
7401 | ||
7402 | So stop. Note that we don't stop if we step into the middle of a | |
7403 | statement. That is said to make things like for (;;) statements | |
7404 | work better. */ | |
1eb8556f | 7405 | infrun_debug_printf ("stepped to a different line"); |
8c95582d AB |
7406 | end_stepping_range (ecs); |
7407 | return; | |
7408 | } | |
a0cbd650 TT |
7409 | else if (get_frame_id (get_current_frame ()) |
7410 | == ecs->event_thread->control.step_frame_id) | |
8c95582d | 7411 | { |
ebde6f2d TV |
7412 | /* We are not at the start of a statement, and we have not changed |
7413 | frame. | |
7414 | ||
7415 | We ignore this line table entry, and continue stepping forward, | |
8c95582d AB |
7416 | looking for a better place to stop. */ |
7417 | refresh_step_info = false; | |
1eb8556f SM |
7418 | infrun_debug_printf ("stepped to a different line, but " |
7419 | "it's not the start of a statement"); | |
8c95582d | 7420 | } |
ebde6f2d TV |
7421 | else |
7422 | { | |
7423 | /* We are not the start of a statement, and we have changed frame. | |
7424 | ||
7425 | We ignore this line table entry, and continue stepping forward, | |
7426 | looking for a better place to stop. Keep refresh_step_info at | |
7427 | true to note that the frame has changed, but ignore the line | |
7428 | number to make sure we don't ignore a subsequent entry with the | |
7429 | same line number. */ | |
7430 | stop_pc_sal.line = 0; | |
7431 | infrun_debug_printf ("stepped to a different frame, but " | |
7432 | "it's not the start of a statement"); | |
7433 | } | |
488f131b | 7434 | } |
c906108c | 7435 | |
488f131b | 7436 | /* We aren't done stepping. |
c906108c | 7437 | |
488f131b JB |
7438 | Optimize by setting the stepping range to the line. |
7439 | (We might not be in the original line, but if we entered a | |
7440 | new line in mid-statement, we continue stepping. This makes | |
8c95582d AB |
7441 | things like for(;;) statements work better.) |
7442 | ||
7443 | If we entered a SAL that indicates a non-statement line table entry, | |
7444 | then we update the stepping range, but we don't update the step info, | |
7445 | which includes things like the line number we are stepping away from. | |
7446 | This means we will stop when we find a line table entry that is marked | |
7447 | as is-statement, even if it matches the non-statement one we just | |
7448 | stepped into. */ | |
c906108c | 7449 | |
16c381f0 JK |
7450 | ecs->event_thread->control.step_range_start = stop_pc_sal.pc; |
7451 | ecs->event_thread->control.step_range_end = stop_pc_sal.end; | |
c1e36e3e | 7452 | ecs->event_thread->control.may_range_step = 1; |
c8353d68 AB |
7453 | infrun_debug_printf |
7454 | ("updated step range, start = %s, end = %s, may_range_step = %d", | |
7455 | paddress (gdbarch, ecs->event_thread->control.step_range_start), | |
7456 | paddress (gdbarch, ecs->event_thread->control.step_range_end), | |
7457 | ecs->event_thread->control.may_range_step); | |
8c95582d AB |
7458 | if (refresh_step_info) |
7459 | set_step_info (ecs->event_thread, frame, stop_pc_sal); | |
488f131b | 7460 | |
1eb8556f | 7461 | infrun_debug_printf ("keep going"); |
488f131b | 7462 | keep_going (ecs); |
104c1213 JM |
7463 | } |
7464 | ||
408f6686 PA |
7465 | static bool restart_stepped_thread (process_stratum_target *resume_target, |
7466 | ptid_t resume_ptid); | |
7467 | ||
c447ac0b PA |
7468 | /* In all-stop mode, if we're currently stepping but have stopped in |
7469 | some other thread, we may need to switch back to the stepped | |
7470 | thread. Returns true we set the inferior running, false if we left | |
7471 | it stopped (and the event needs further processing). */ | |
7472 | ||
c4464ade | 7473 | static bool |
c447ac0b PA |
7474 | switch_back_to_stepped_thread (struct execution_control_state *ecs) |
7475 | { | |
fbea99ea | 7476 | if (!target_is_non_stop_p ()) |
c447ac0b | 7477 | { |
99619bea PA |
7478 | /* If any thread is blocked on some internal breakpoint, and we |
7479 | simply need to step over that breakpoint to get it going | |
7480 | again, do that first. */ | |
7481 | ||
7482 | /* However, if we see an event for the stepping thread, then we | |
7483 | know all other threads have been moved past their breakpoints | |
7484 | already. Let the caller check whether the step is finished, | |
7485 | etc., before deciding to move it past a breakpoint. */ | |
7486 | if (ecs->event_thread->control.step_range_end != 0) | |
c4464ade | 7487 | return false; |
99619bea PA |
7488 | |
7489 | /* Check if the current thread is blocked on an incomplete | |
7490 | step-over, interrupted by a random signal. */ | |
7491 | if (ecs->event_thread->control.trap_expected | |
1edb66d8 | 7492 | && ecs->event_thread->stop_signal () != GDB_SIGNAL_TRAP) |
c447ac0b | 7493 | { |
1eb8556f SM |
7494 | infrun_debug_printf |
7495 | ("need to finish step-over of [%s]", | |
0fab7955 | 7496 | ecs->event_thread->ptid.to_string ().c_str ()); |
99619bea | 7497 | keep_going (ecs); |
c4464ade | 7498 | return true; |
99619bea | 7499 | } |
2adfaa28 | 7500 | |
99619bea PA |
7501 | /* Check if the current thread is blocked by a single-step |
7502 | breakpoint of another thread. */ | |
7503 | if (ecs->hit_singlestep_breakpoint) | |
7504 | { | |
1eb8556f | 7505 | infrun_debug_printf ("need to step [%s] over single-step breakpoint", |
0fab7955 | 7506 | ecs->ptid.to_string ().c_str ()); |
99619bea | 7507 | keep_going (ecs); |
c4464ade | 7508 | return true; |
99619bea PA |
7509 | } |
7510 | ||
4d9d9d04 PA |
7511 | /* If this thread needs yet another step-over (e.g., stepping |
7512 | through a delay slot), do it first before moving on to | |
7513 | another thread. */ | |
7514 | if (thread_still_needs_step_over (ecs->event_thread)) | |
7515 | { | |
1eb8556f SM |
7516 | infrun_debug_printf |
7517 | ("thread [%s] still needs step-over", | |
0fab7955 | 7518 | ecs->event_thread->ptid.to_string ().c_str ()); |
4d9d9d04 | 7519 | keep_going (ecs); |
c4464ade | 7520 | return true; |
4d9d9d04 | 7521 | } |
70509625 | 7522 | |
483805cf PA |
7523 | /* If scheduler locking applies even if not stepping, there's no |
7524 | need to walk over threads. Above we've checked whether the | |
7525 | current thread is stepping. If some other thread not the | |
7526 | event thread is stepping, then it must be that scheduler | |
7527 | locking is not in effect. */ | |
856e7dd6 | 7528 | if (schedlock_applies (ecs->event_thread)) |
c4464ade | 7529 | return false; |
483805cf | 7530 | |
4d9d9d04 PA |
7531 | /* Otherwise, we no longer expect a trap in the current thread. |
7532 | Clear the trap_expected flag before switching back -- this is | |
7533 | what keep_going does as well, if we call it. */ | |
7534 | ecs->event_thread->control.trap_expected = 0; | |
7535 | ||
7536 | /* Likewise, clear the signal if it should not be passed. */ | |
1edb66d8 SM |
7537 | if (!signal_program[ecs->event_thread->stop_signal ()]) |
7538 | ecs->event_thread->set_stop_signal (GDB_SIGNAL_0); | |
4d9d9d04 | 7539 | |
408f6686 | 7540 | if (restart_stepped_thread (ecs->target, ecs->ptid)) |
4d9d9d04 PA |
7541 | { |
7542 | prepare_to_wait (ecs); | |
c4464ade | 7543 | return true; |
4d9d9d04 PA |
7544 | } |
7545 | ||
408f6686 PA |
7546 | switch_to_thread (ecs->event_thread); |
7547 | } | |
4d9d9d04 | 7548 | |
408f6686 PA |
7549 | return false; |
7550 | } | |
f3f8ece4 | 7551 | |
408f6686 PA |
7552 | /* Look for the thread that was stepping, and resume it. |
7553 | RESUME_TARGET / RESUME_PTID indicate the set of threads the caller | |
7554 | is resuming. Return true if a thread was started, false | |
7555 | otherwise. */ | |
483805cf | 7556 | |
408f6686 PA |
7557 | static bool |
7558 | restart_stepped_thread (process_stratum_target *resume_target, | |
7559 | ptid_t resume_ptid) | |
7560 | { | |
7561 | /* Do all pending step-overs before actually proceeding with | |
7562 | step/next/etc. */ | |
7563 | if (start_step_over ()) | |
7564 | return true; | |
483805cf | 7565 | |
408f6686 PA |
7566 | for (thread_info *tp : all_threads_safe ()) |
7567 | { | |
7568 | if (tp->state == THREAD_EXITED) | |
7569 | continue; | |
7570 | ||
1edb66d8 | 7571 | if (tp->has_pending_waitstatus ()) |
408f6686 | 7572 | continue; |
483805cf | 7573 | |
408f6686 PA |
7574 | /* Ignore threads of processes the caller is not |
7575 | resuming. */ | |
7576 | if (!sched_multi | |
7577 | && (tp->inf->process_target () != resume_target | |
7578 | || tp->inf->pid != resume_ptid.pid ())) | |
7579 | continue; | |
483805cf | 7580 | |
408f6686 PA |
7581 | if (tp->control.trap_expected) |
7582 | { | |
7583 | infrun_debug_printf ("switching back to stepped thread (step-over)"); | |
483805cf | 7584 | |
408f6686 PA |
7585 | if (keep_going_stepped_thread (tp)) |
7586 | return true; | |
99619bea | 7587 | } |
408f6686 PA |
7588 | } |
7589 | ||
7590 | for (thread_info *tp : all_threads_safe ()) | |
7591 | { | |
7592 | if (tp->state == THREAD_EXITED) | |
7593 | continue; | |
7594 | ||
1edb66d8 | 7595 | if (tp->has_pending_waitstatus ()) |
408f6686 | 7596 | continue; |
99619bea | 7597 | |
408f6686 PA |
7598 | /* Ignore threads of processes the caller is not |
7599 | resuming. */ | |
7600 | if (!sched_multi | |
7601 | && (tp->inf->process_target () != resume_target | |
7602 | || tp->inf->pid != resume_ptid.pid ())) | |
7603 | continue; | |
7604 | ||
7605 | /* Did we find the stepping thread? */ | |
7606 | if (tp->control.step_range_end) | |
99619bea | 7607 | { |
408f6686 | 7608 | infrun_debug_printf ("switching back to stepped thread (stepping)"); |
c447ac0b | 7609 | |
408f6686 PA |
7610 | if (keep_going_stepped_thread (tp)) |
7611 | return true; | |
2ac7589c PA |
7612 | } |
7613 | } | |
2adfaa28 | 7614 | |
c4464ade | 7615 | return false; |
2ac7589c | 7616 | } |
2adfaa28 | 7617 | |
408f6686 PA |
7618 | /* See infrun.h. */ |
7619 | ||
7620 | void | |
7621 | restart_after_all_stop_detach (process_stratum_target *proc_target) | |
7622 | { | |
7623 | /* Note we don't check target_is_non_stop_p() here, because the | |
7624 | current inferior may no longer have a process_stratum target | |
7625 | pushed, as we just detached. */ | |
7626 | ||
7627 | /* See if we have a THREAD_RUNNING thread that need to be | |
7628 | re-resumed. If we have any thread that is already executing, | |
7629 | then we don't need to resume the target -- it is already been | |
7630 | resumed. With the remote target (in all-stop), it's even | |
7631 | impossible to issue another resumption if the target is already | |
7632 | resumed, until the target reports a stop. */ | |
7633 | for (thread_info *thr : all_threads (proc_target)) | |
7634 | { | |
7635 | if (thr->state != THREAD_RUNNING) | |
7636 | continue; | |
7637 | ||
7638 | /* If we have any thread that is already executing, then we | |
7639 | don't need to resume the target -- it is already been | |
7640 | resumed. */ | |
611841bb | 7641 | if (thr->executing ()) |
408f6686 PA |
7642 | return; |
7643 | ||
7644 | /* If we have a pending event to process, skip resuming the | |
7645 | target and go straight to processing it. */ | |
1edb66d8 | 7646 | if (thr->resumed () && thr->has_pending_waitstatus ()) |
408f6686 PA |
7647 | return; |
7648 | } | |
7649 | ||
7650 | /* Alright, we need to re-resume the target. If a thread was | |
7651 | stepping, we need to restart it stepping. */ | |
7652 | if (restart_stepped_thread (proc_target, minus_one_ptid)) | |
7653 | return; | |
7654 | ||
7655 | /* Otherwise, find the first THREAD_RUNNING thread and resume | |
7656 | it. */ | |
7657 | for (thread_info *thr : all_threads (proc_target)) | |
7658 | { | |
7659 | if (thr->state != THREAD_RUNNING) | |
7660 | continue; | |
7661 | ||
7662 | execution_control_state ecs; | |
7663 | reset_ecs (&ecs, thr); | |
7664 | switch_to_thread (thr); | |
7665 | keep_going (&ecs); | |
7666 | return; | |
7667 | } | |
7668 | } | |
7669 | ||
2ac7589c PA |
7670 | /* Set a previously stepped thread back to stepping. Returns true on |
7671 | success, false if the resume is not possible (e.g., the thread | |
7672 | vanished). */ | |
7673 | ||
c4464ade | 7674 | static bool |
2ac7589c PA |
7675 | keep_going_stepped_thread (struct thread_info *tp) |
7676 | { | |
bd2b40ac | 7677 | frame_info_ptr frame; |
2ac7589c PA |
7678 | struct execution_control_state ecss; |
7679 | struct execution_control_state *ecs = &ecss; | |
2adfaa28 | 7680 | |
2ac7589c PA |
7681 | /* If the stepping thread exited, then don't try to switch back and |
7682 | resume it, which could fail in several different ways depending | |
7683 | on the target. Instead, just keep going. | |
2adfaa28 | 7684 | |
2ac7589c PA |
7685 | We can find a stepping dead thread in the thread list in two |
7686 | cases: | |
2adfaa28 | 7687 | |
2ac7589c PA |
7688 | - The target supports thread exit events, and when the target |
7689 | tries to delete the thread from the thread list, inferior_ptid | |
7690 | pointed at the exiting thread. In such case, calling | |
7691 | delete_thread does not really remove the thread from the list; | |
7692 | instead, the thread is left listed, with 'exited' state. | |
64ce06e4 | 7693 | |
2ac7589c PA |
7694 | - The target's debug interface does not support thread exit |
7695 | events, and so we have no idea whatsoever if the previously | |
7696 | stepping thread is still alive. For that reason, we need to | |
7697 | synchronously query the target now. */ | |
2adfaa28 | 7698 | |
00431a78 | 7699 | if (tp->state == THREAD_EXITED || !target_thread_alive (tp->ptid)) |
2ac7589c | 7700 | { |
1eb8556f SM |
7701 | infrun_debug_printf ("not resuming previously stepped thread, it has " |
7702 | "vanished"); | |
2ac7589c | 7703 | |
00431a78 | 7704 | delete_thread (tp); |
c4464ade | 7705 | return false; |
c447ac0b | 7706 | } |
2ac7589c | 7707 | |
1eb8556f | 7708 | infrun_debug_printf ("resuming previously stepped thread"); |
2ac7589c PA |
7709 | |
7710 | reset_ecs (ecs, tp); | |
00431a78 | 7711 | switch_to_thread (tp); |
2ac7589c | 7712 | |
1edb66d8 | 7713 | tp->set_stop_pc (regcache_read_pc (get_thread_regcache (tp))); |
2ac7589c | 7714 | frame = get_current_frame (); |
2ac7589c PA |
7715 | |
7716 | /* If the PC of the thread we were trying to single-step has | |
7717 | changed, then that thread has trapped or been signaled, but the | |
7718 | event has not been reported to GDB yet. Re-poll the target | |
7719 | looking for this particular thread's event (i.e. temporarily | |
7720 | enable schedlock) by: | |
7721 | ||
7722 | - setting a break at the current PC | |
7723 | - resuming that particular thread, only (by setting trap | |
7724 | expected) | |
7725 | ||
7726 | This prevents us continuously moving the single-step breakpoint | |
7727 | forward, one instruction at a time, overstepping. */ | |
7728 | ||
1edb66d8 | 7729 | if (tp->stop_pc () != tp->prev_pc) |
2ac7589c PA |
7730 | { |
7731 | ptid_t resume_ptid; | |
7732 | ||
1eb8556f SM |
7733 | infrun_debug_printf ("expected thread advanced also (%s -> %s)", |
7734 | paddress (target_gdbarch (), tp->prev_pc), | |
1edb66d8 | 7735 | paddress (target_gdbarch (), tp->stop_pc ())); |
2ac7589c PA |
7736 | |
7737 | /* Clear the info of the previous step-over, as it's no longer | |
7738 | valid (if the thread was trying to step over a breakpoint, it | |
7739 | has already succeeded). It's what keep_going would do too, | |
7740 | if we called it. Do this before trying to insert the sss | |
7741 | breakpoint, otherwise if we were previously trying to step | |
7742 | over this exact address in another thread, the breakpoint is | |
7743 | skipped. */ | |
7744 | clear_step_over_info (); | |
7745 | tp->control.trap_expected = 0; | |
7746 | ||
7747 | insert_single_step_breakpoint (get_frame_arch (frame), | |
7748 | get_frame_address_space (frame), | |
1edb66d8 | 7749 | tp->stop_pc ()); |
2ac7589c | 7750 | |
7846f3aa | 7751 | tp->set_resumed (true); |
fbea99ea | 7752 | resume_ptid = internal_resume_ptid (tp->control.stepping_command); |
c4464ade | 7753 | do_target_resume (resume_ptid, false, GDB_SIGNAL_0); |
2ac7589c PA |
7754 | } |
7755 | else | |
7756 | { | |
1eb8556f | 7757 | infrun_debug_printf ("expected thread still hasn't advanced"); |
2ac7589c PA |
7758 | |
7759 | keep_going_pass_signal (ecs); | |
7760 | } | |
c4464ade SM |
7761 | |
7762 | return true; | |
c447ac0b PA |
7763 | } |
7764 | ||
8b061563 PA |
7765 | /* Is thread TP in the middle of (software or hardware) |
7766 | single-stepping? (Note the result of this function must never be | |
7767 | passed directly as target_resume's STEP parameter.) */ | |
104c1213 | 7768 | |
c4464ade | 7769 | static bool |
b3444185 | 7770 | currently_stepping (struct thread_info *tp) |
a7212384 | 7771 | { |
8358c15c JK |
7772 | return ((tp->control.step_range_end |
7773 | && tp->control.step_resume_breakpoint == NULL) | |
7774 | || tp->control.trap_expected | |
af48d08f | 7775 | || tp->stepped_breakpoint |
8358c15c | 7776 | || bpstat_should_step ()); |
a7212384 UW |
7777 | } |
7778 | ||
b2175913 MS |
7779 | /* Inferior has stepped into a subroutine call with source code that |
7780 | we should not step over. Do step to the first line of code in | |
7781 | it. */ | |
c2c6d25f JM |
7782 | |
7783 | static void | |
568d6575 UW |
7784 | handle_step_into_function (struct gdbarch *gdbarch, |
7785 | struct execution_control_state *ecs) | |
c2c6d25f | 7786 | { |
7e324e48 GB |
7787 | fill_in_stop_func (gdbarch, ecs); |
7788 | ||
f2ffa92b | 7789 | compunit_symtab *cust |
1edb66d8 | 7790 | = find_pc_compunit_symtab (ecs->event_thread->stop_pc ()); |
43f3e411 | 7791 | if (cust != NULL && compunit_language (cust) != language_asm) |
46a62268 YQ |
7792 | ecs->stop_func_start |
7793 | = gdbarch_skip_prologue_noexcept (gdbarch, ecs->stop_func_start); | |
c2c6d25f | 7794 | |
51abb421 | 7795 | symtab_and_line stop_func_sal = find_pc_line (ecs->stop_func_start, 0); |
c2c6d25f JM |
7796 | /* Use the step_resume_break to step until the end of the prologue, |
7797 | even if that involves jumps (as it seems to on the vax under | |
7798 | 4.2). */ | |
7799 | /* If the prologue ends in the middle of a source line, continue to | |
7800 | the end of that source line (if it is still within the function). | |
7801 | Otherwise, just go to end of prologue. */ | |
2afb61aa PA |
7802 | if (stop_func_sal.end |
7803 | && stop_func_sal.pc != ecs->stop_func_start | |
7804 | && stop_func_sal.end < ecs->stop_func_end) | |
7805 | ecs->stop_func_start = stop_func_sal.end; | |
c2c6d25f | 7806 | |
2dbd5e30 KB |
7807 | /* Architectures which require breakpoint adjustment might not be able |
7808 | to place a breakpoint at the computed address. If so, the test | |
7809 | ``ecs->stop_func_start == stop_pc'' will never succeed. Adjust | |
7810 | ecs->stop_func_start to an address at which a breakpoint may be | |
7811 | legitimately placed. | |
8fb3e588 | 7812 | |
2dbd5e30 KB |
7813 | Note: kevinb/2004-01-19: On FR-V, if this adjustment is not |
7814 | made, GDB will enter an infinite loop when stepping through | |
7815 | optimized code consisting of VLIW instructions which contain | |
7816 | subinstructions corresponding to different source lines. On | |
7817 | FR-V, it's not permitted to place a breakpoint on any but the | |
7818 | first subinstruction of a VLIW instruction. When a breakpoint is | |
7819 | set, GDB will adjust the breakpoint address to the beginning of | |
7820 | the VLIW instruction. Thus, we need to make the corresponding | |
7821 | adjustment here when computing the stop address. */ | |
8fb3e588 | 7822 | |
568d6575 | 7823 | if (gdbarch_adjust_breakpoint_address_p (gdbarch)) |
2dbd5e30 KB |
7824 | { |
7825 | ecs->stop_func_start | |
568d6575 | 7826 | = gdbarch_adjust_breakpoint_address (gdbarch, |
8fb3e588 | 7827 | ecs->stop_func_start); |
2dbd5e30 KB |
7828 | } |
7829 | ||
1edb66d8 | 7830 | if (ecs->stop_func_start == ecs->event_thread->stop_pc ()) |
c2c6d25f JM |
7831 | { |
7832 | /* We are already there: stop now. */ | |
bdc36728 | 7833 | end_stepping_range (ecs); |
c2c6d25f JM |
7834 | return; |
7835 | } | |
7836 | else | |
7837 | { | |
7838 | /* Put the step-breakpoint there and go until there. */ | |
51abb421 | 7839 | symtab_and_line sr_sal; |
c2c6d25f JM |
7840 | sr_sal.pc = ecs->stop_func_start; |
7841 | sr_sal.section = find_pc_overlay (ecs->stop_func_start); | |
6c95b8df | 7842 | sr_sal.pspace = get_frame_program_space (get_current_frame ()); |
44cbf7b5 | 7843 | |
c2c6d25f | 7844 | /* Do not specify what the fp should be when we stop since on |
dda83cd7 SM |
7845 | some machines the prologue is where the new fp value is |
7846 | established. */ | |
a6d9a66e | 7847 | insert_step_resume_breakpoint_at_sal (gdbarch, sr_sal, null_frame_id); |
c2c6d25f JM |
7848 | |
7849 | /* And make sure stepping stops right away then. */ | |
16c381f0 | 7850 | ecs->event_thread->control.step_range_end |
dda83cd7 | 7851 | = ecs->event_thread->control.step_range_start; |
c2c6d25f JM |
7852 | } |
7853 | keep_going (ecs); | |
7854 | } | |
d4f3574e | 7855 | |
b2175913 MS |
7856 | /* Inferior has stepped backward into a subroutine call with source |
7857 | code that we should not step over. Do step to the beginning of the | |
7858 | last line of code in it. */ | |
7859 | ||
7860 | static void | |
568d6575 UW |
7861 | handle_step_into_function_backward (struct gdbarch *gdbarch, |
7862 | struct execution_control_state *ecs) | |
b2175913 | 7863 | { |
43f3e411 | 7864 | struct compunit_symtab *cust; |
167e4384 | 7865 | struct symtab_and_line stop_func_sal; |
b2175913 | 7866 | |
7e324e48 GB |
7867 | fill_in_stop_func (gdbarch, ecs); |
7868 | ||
1edb66d8 | 7869 | cust = find_pc_compunit_symtab (ecs->event_thread->stop_pc ()); |
43f3e411 | 7870 | if (cust != NULL && compunit_language (cust) != language_asm) |
46a62268 YQ |
7871 | ecs->stop_func_start |
7872 | = gdbarch_skip_prologue_noexcept (gdbarch, ecs->stop_func_start); | |
b2175913 | 7873 | |
1edb66d8 | 7874 | stop_func_sal = find_pc_line (ecs->event_thread->stop_pc (), 0); |
b2175913 MS |
7875 | |
7876 | /* OK, we're just going to keep stepping here. */ | |
1edb66d8 | 7877 | if (stop_func_sal.pc == ecs->event_thread->stop_pc ()) |
b2175913 MS |
7878 | { |
7879 | /* We're there already. Just stop stepping now. */ | |
bdc36728 | 7880 | end_stepping_range (ecs); |
b2175913 MS |
7881 | } |
7882 | else | |
7883 | { | |
7884 | /* Else just reset the step range and keep going. | |
7885 | No step-resume breakpoint, they don't work for | |
7886 | epilogues, which can have multiple entry paths. */ | |
16c381f0 JK |
7887 | ecs->event_thread->control.step_range_start = stop_func_sal.pc; |
7888 | ecs->event_thread->control.step_range_end = stop_func_sal.end; | |
b2175913 MS |
7889 | keep_going (ecs); |
7890 | } | |
7891 | return; | |
7892 | } | |
7893 | ||
d3169d93 | 7894 | /* Insert a "step-resume breakpoint" at SR_SAL with frame ID SR_ID. |
44cbf7b5 AC |
7895 | This is used to both functions and to skip over code. */ |
7896 | ||
7897 | static void | |
2c03e5be PA |
7898 | insert_step_resume_breakpoint_at_sal_1 (struct gdbarch *gdbarch, |
7899 | struct symtab_and_line sr_sal, | |
7900 | struct frame_id sr_id, | |
7901 | enum bptype sr_type) | |
44cbf7b5 | 7902 | { |
611c83ae PA |
7903 | /* There should never be more than one step-resume or longjmp-resume |
7904 | breakpoint per thread, so we should never be setting a new | |
44cbf7b5 | 7905 | step_resume_breakpoint when one is already active. */ |
8358c15c | 7906 | gdb_assert (inferior_thread ()->control.step_resume_breakpoint == NULL); |
2c03e5be | 7907 | gdb_assert (sr_type == bp_step_resume || sr_type == bp_hp_step_resume); |
d3169d93 | 7908 | |
1eb8556f SM |
7909 | infrun_debug_printf ("inserting step-resume breakpoint at %s", |
7910 | paddress (gdbarch, sr_sal.pc)); | |
d3169d93 | 7911 | |
8358c15c | 7912 | inferior_thread ()->control.step_resume_breakpoint |
454dafbd | 7913 | = set_momentary_breakpoint (gdbarch, sr_sal, sr_id, sr_type).release (); |
2c03e5be PA |
7914 | } |
7915 | ||
9da8c2a0 | 7916 | void |
2c03e5be PA |
7917 | insert_step_resume_breakpoint_at_sal (struct gdbarch *gdbarch, |
7918 | struct symtab_and_line sr_sal, | |
7919 | struct frame_id sr_id) | |
7920 | { | |
7921 | insert_step_resume_breakpoint_at_sal_1 (gdbarch, | |
7922 | sr_sal, sr_id, | |
7923 | bp_step_resume); | |
44cbf7b5 | 7924 | } |
7ce450bd | 7925 | |
2c03e5be PA |
7926 | /* Insert a "high-priority step-resume breakpoint" at RETURN_FRAME.pc. |
7927 | This is used to skip a potential signal handler. | |
7ce450bd | 7928 | |
14e60db5 DJ |
7929 | This is called with the interrupted function's frame. The signal |
7930 | handler, when it returns, will resume the interrupted function at | |
7931 | RETURN_FRAME.pc. */ | |
d303a6c7 AC |
7932 | |
7933 | static void | |
bd2b40ac | 7934 | insert_hp_step_resume_breakpoint_at_frame (frame_info_ptr return_frame) |
d303a6c7 | 7935 | { |
f4c1edd8 | 7936 | gdb_assert (return_frame != NULL); |
d303a6c7 | 7937 | |
51abb421 PA |
7938 | struct gdbarch *gdbarch = get_frame_arch (return_frame); |
7939 | ||
7940 | symtab_and_line sr_sal; | |
568d6575 | 7941 | sr_sal.pc = gdbarch_addr_bits_remove (gdbarch, get_frame_pc (return_frame)); |
d303a6c7 | 7942 | sr_sal.section = find_pc_overlay (sr_sal.pc); |
6c95b8df | 7943 | sr_sal.pspace = get_frame_program_space (return_frame); |
d303a6c7 | 7944 | |
2c03e5be PA |
7945 | insert_step_resume_breakpoint_at_sal_1 (gdbarch, sr_sal, |
7946 | get_stack_frame_id (return_frame), | |
7947 | bp_hp_step_resume); | |
d303a6c7 AC |
7948 | } |
7949 | ||
2c03e5be PA |
7950 | /* Insert a "step-resume breakpoint" at the previous frame's PC. This |
7951 | is used to skip a function after stepping into it (for "next" or if | |
7952 | the called function has no debugging information). | |
14e60db5 DJ |
7953 | |
7954 | The current function has almost always been reached by single | |
7955 | stepping a call or return instruction. NEXT_FRAME belongs to the | |
7956 | current function, and the breakpoint will be set at the caller's | |
7957 | resume address. | |
7958 | ||
7959 | This is a separate function rather than reusing | |
2c03e5be | 7960 | insert_hp_step_resume_breakpoint_at_frame in order to avoid |
14e60db5 | 7961 | get_prev_frame, which may stop prematurely (see the implementation |
c7ce8faa | 7962 | of frame_unwind_caller_id for an example). */ |
14e60db5 DJ |
7963 | |
7964 | static void | |
bd2b40ac | 7965 | insert_step_resume_breakpoint_at_caller (frame_info_ptr next_frame) |
14e60db5 | 7966 | { |
14e60db5 DJ |
7967 | /* We shouldn't have gotten here if we don't know where the call site |
7968 | is. */ | |
c7ce8faa | 7969 | gdb_assert (frame_id_p (frame_unwind_caller_id (next_frame))); |
14e60db5 | 7970 | |
51abb421 | 7971 | struct gdbarch *gdbarch = frame_unwind_caller_arch (next_frame); |
14e60db5 | 7972 | |
51abb421 | 7973 | symtab_and_line sr_sal; |
c7ce8faa DJ |
7974 | sr_sal.pc = gdbarch_addr_bits_remove (gdbarch, |
7975 | frame_unwind_caller_pc (next_frame)); | |
14e60db5 | 7976 | sr_sal.section = find_pc_overlay (sr_sal.pc); |
6c95b8df | 7977 | sr_sal.pspace = frame_unwind_program_space (next_frame); |
14e60db5 | 7978 | |
a6d9a66e | 7979 | insert_step_resume_breakpoint_at_sal (gdbarch, sr_sal, |
c7ce8faa | 7980 | frame_unwind_caller_id (next_frame)); |
14e60db5 DJ |
7981 | } |
7982 | ||
611c83ae PA |
7983 | /* Insert a "longjmp-resume" breakpoint at PC. This is used to set a |
7984 | new breakpoint at the target of a jmp_buf. The handling of | |
7985 | longjmp-resume uses the same mechanisms used for handling | |
7986 | "step-resume" breakpoints. */ | |
7987 | ||
7988 | static void | |
a6d9a66e | 7989 | insert_longjmp_resume_breakpoint (struct gdbarch *gdbarch, CORE_ADDR pc) |
611c83ae | 7990 | { |
e81a37f7 TT |
7991 | /* There should never be more than one longjmp-resume breakpoint per |
7992 | thread, so we should never be setting a new | |
611c83ae | 7993 | longjmp_resume_breakpoint when one is already active. */ |
e81a37f7 | 7994 | gdb_assert (inferior_thread ()->control.exception_resume_breakpoint == NULL); |
611c83ae | 7995 | |
1eb8556f SM |
7996 | infrun_debug_printf ("inserting longjmp-resume breakpoint at %s", |
7997 | paddress (gdbarch, pc)); | |
611c83ae | 7998 | |
e81a37f7 | 7999 | inferior_thread ()->control.exception_resume_breakpoint = |
454dafbd | 8000 | set_momentary_breakpoint_at_pc (gdbarch, pc, bp_longjmp_resume).release (); |
611c83ae PA |
8001 | } |
8002 | ||
186c406b TT |
8003 | /* Insert an exception resume breakpoint. TP is the thread throwing |
8004 | the exception. The block B is the block of the unwinder debug hook | |
8005 | function. FRAME is the frame corresponding to the call to this | |
8006 | function. SYM is the symbol of the function argument holding the | |
8007 | target PC of the exception. */ | |
8008 | ||
8009 | static void | |
8010 | insert_exception_resume_breakpoint (struct thread_info *tp, | |
3977b71f | 8011 | const struct block *b, |
bd2b40ac | 8012 | frame_info_ptr frame, |
186c406b TT |
8013 | struct symbol *sym) |
8014 | { | |
a70b8144 | 8015 | try |
186c406b | 8016 | { |
63e43d3a | 8017 | struct block_symbol vsym; |
186c406b TT |
8018 | struct value *value; |
8019 | CORE_ADDR handler; | |
8020 | struct breakpoint *bp; | |
8021 | ||
987012b8 | 8022 | vsym = lookup_symbol_search_name (sym->search_name (), |
de63c46b | 8023 | b, VAR_DOMAIN); |
63e43d3a | 8024 | value = read_var_value (vsym.symbol, vsym.block, frame); |
186c406b TT |
8025 | /* If the value was optimized out, revert to the old behavior. */ |
8026 | if (! value_optimized_out (value)) | |
8027 | { | |
8028 | handler = value_as_address (value); | |
8029 | ||
1eb8556f SM |
8030 | infrun_debug_printf ("exception resume at %lx", |
8031 | (unsigned long) handler); | |
186c406b TT |
8032 | |
8033 | bp = set_momentary_breakpoint_at_pc (get_frame_arch (frame), | |
454dafbd TT |
8034 | handler, |
8035 | bp_exception_resume).release (); | |
c70a6932 JK |
8036 | |
8037 | /* set_momentary_breakpoint_at_pc invalidates FRAME. */ | |
8038 | frame = NULL; | |
8039 | ||
5d5658a1 | 8040 | bp->thread = tp->global_num; |
186c406b TT |
8041 | inferior_thread ()->control.exception_resume_breakpoint = bp; |
8042 | } | |
8043 | } | |
230d2906 | 8044 | catch (const gdb_exception_error &e) |
492d29ea PA |
8045 | { |
8046 | /* We want to ignore errors here. */ | |
8047 | } | |
186c406b TT |
8048 | } |
8049 | ||
28106bc2 SDJ |
8050 | /* A helper for check_exception_resume that sets an |
8051 | exception-breakpoint based on a SystemTap probe. */ | |
8052 | ||
8053 | static void | |
8054 | insert_exception_resume_from_probe (struct thread_info *tp, | |
729662a5 | 8055 | const struct bound_probe *probe, |
bd2b40ac | 8056 | frame_info_ptr frame) |
28106bc2 SDJ |
8057 | { |
8058 | struct value *arg_value; | |
8059 | CORE_ADDR handler; | |
8060 | struct breakpoint *bp; | |
8061 | ||
8062 | arg_value = probe_safe_evaluate_at_pc (frame, 1); | |
8063 | if (!arg_value) | |
8064 | return; | |
8065 | ||
8066 | handler = value_as_address (arg_value); | |
8067 | ||
1eb8556f SM |
8068 | infrun_debug_printf ("exception resume at %s", |
8069 | paddress (probe->objfile->arch (), handler)); | |
28106bc2 SDJ |
8070 | |
8071 | bp = set_momentary_breakpoint_at_pc (get_frame_arch (frame), | |
454dafbd | 8072 | handler, bp_exception_resume).release (); |
5d5658a1 | 8073 | bp->thread = tp->global_num; |
28106bc2 SDJ |
8074 | inferior_thread ()->control.exception_resume_breakpoint = bp; |
8075 | } | |
8076 | ||
186c406b TT |
8077 | /* This is called when an exception has been intercepted. Check to |
8078 | see whether the exception's destination is of interest, and if so, | |
8079 | set an exception resume breakpoint there. */ | |
8080 | ||
8081 | static void | |
8082 | check_exception_resume (struct execution_control_state *ecs, | |
bd2b40ac | 8083 | frame_info_ptr frame) |
186c406b | 8084 | { |
729662a5 | 8085 | struct bound_probe probe; |
28106bc2 SDJ |
8086 | struct symbol *func; |
8087 | ||
8088 | /* First see if this exception unwinding breakpoint was set via a | |
8089 | SystemTap probe point. If so, the probe has two arguments: the | |
8090 | CFA and the HANDLER. We ignore the CFA, extract the handler, and | |
8091 | set a breakpoint there. */ | |
6bac7473 | 8092 | probe = find_probe_by_pc (get_frame_pc (frame)); |
935676c9 | 8093 | if (probe.prob) |
28106bc2 | 8094 | { |
729662a5 | 8095 | insert_exception_resume_from_probe (ecs->event_thread, &probe, frame); |
28106bc2 SDJ |
8096 | return; |
8097 | } | |
8098 | ||
8099 | func = get_frame_function (frame); | |
8100 | if (!func) | |
8101 | return; | |
186c406b | 8102 | |
a70b8144 | 8103 | try |
186c406b | 8104 | { |
3977b71f | 8105 | const struct block *b; |
8157b174 | 8106 | struct block_iterator iter; |
186c406b TT |
8107 | struct symbol *sym; |
8108 | int argno = 0; | |
8109 | ||
8110 | /* The exception breakpoint is a thread-specific breakpoint on | |
8111 | the unwinder's debug hook, declared as: | |
8112 | ||
8113 | void _Unwind_DebugHook (void *cfa, void *handler); | |
8114 | ||
8115 | The CFA argument indicates the frame to which control is | |
8116 | about to be transferred. HANDLER is the destination PC. | |
8117 | ||
8118 | We ignore the CFA and set a temporary breakpoint at HANDLER. | |
8119 | This is not extremely efficient but it avoids issues in gdb | |
8120 | with computing the DWARF CFA, and it also works even in weird | |
8121 | cases such as throwing an exception from inside a signal | |
8122 | handler. */ | |
8123 | ||
4aeddc50 | 8124 | b = func->value_block (); |
186c406b TT |
8125 | ALL_BLOCK_SYMBOLS (b, iter, sym) |
8126 | { | |
d9743061 | 8127 | if (!sym->is_argument ()) |
186c406b TT |
8128 | continue; |
8129 | ||
8130 | if (argno == 0) | |
8131 | ++argno; | |
8132 | else | |
8133 | { | |
8134 | insert_exception_resume_breakpoint (ecs->event_thread, | |
8135 | b, frame, sym); | |
8136 | break; | |
8137 | } | |
8138 | } | |
8139 | } | |
230d2906 | 8140 | catch (const gdb_exception_error &e) |
492d29ea PA |
8141 | { |
8142 | } | |
186c406b TT |
8143 | } |
8144 | ||
104c1213 | 8145 | static void |
22bcd14b | 8146 | stop_waiting (struct execution_control_state *ecs) |
104c1213 | 8147 | { |
1eb8556f | 8148 | infrun_debug_printf ("stop_waiting"); |
527159b7 | 8149 | |
cd0fc7c3 SS |
8150 | /* Let callers know we don't want to wait for the inferior anymore. */ |
8151 | ecs->wait_some_more = 0; | |
8152 | } | |
8153 | ||
4d9d9d04 PA |
8154 | /* Like keep_going, but passes the signal to the inferior, even if the |
8155 | signal is set to nopass. */ | |
d4f3574e SS |
8156 | |
8157 | static void | |
4d9d9d04 | 8158 | keep_going_pass_signal (struct execution_control_state *ecs) |
d4f3574e | 8159 | { |
d7e15655 | 8160 | gdb_assert (ecs->event_thread->ptid == inferior_ptid); |
7846f3aa | 8161 | gdb_assert (!ecs->event_thread->resumed ()); |
4d9d9d04 | 8162 | |
d4f3574e | 8163 | /* Save the pc before execution, to compare with pc after stop. */ |
fb14de7b | 8164 | ecs->event_thread->prev_pc |
fc75c28b | 8165 | = regcache_read_pc_protected (get_thread_regcache (ecs->event_thread)); |
d4f3574e | 8166 | |
4d9d9d04 | 8167 | if (ecs->event_thread->control.trap_expected) |
d4f3574e | 8168 | { |
4d9d9d04 PA |
8169 | struct thread_info *tp = ecs->event_thread; |
8170 | ||
1eb8556f SM |
8171 | infrun_debug_printf ("%s has trap_expected set, " |
8172 | "resuming to collect trap", | |
0fab7955 | 8173 | tp->ptid.to_string ().c_str ()); |
4d9d9d04 | 8174 | |
a9ba6bae PA |
8175 | /* We haven't yet gotten our trap, and either: intercepted a |
8176 | non-signal event (e.g., a fork); or took a signal which we | |
8177 | are supposed to pass through to the inferior. Simply | |
8178 | continue. */ | |
1edb66d8 | 8179 | resume (ecs->event_thread->stop_signal ()); |
d4f3574e | 8180 | } |
372316f1 PA |
8181 | else if (step_over_info_valid_p ()) |
8182 | { | |
8183 | /* Another thread is stepping over a breakpoint in-line. If | |
8184 | this thread needs a step-over too, queue the request. In | |
8185 | either case, this resume must be deferred for later. */ | |
8186 | struct thread_info *tp = ecs->event_thread; | |
8187 | ||
8188 | if (ecs->hit_singlestep_breakpoint | |
8189 | || thread_still_needs_step_over (tp)) | |
8190 | { | |
1eb8556f SM |
8191 | infrun_debug_printf ("step-over already in progress: " |
8192 | "step-over for %s deferred", | |
0fab7955 | 8193 | tp->ptid.to_string ().c_str ()); |
28d5518b | 8194 | global_thread_step_over_chain_enqueue (tp); |
372316f1 PA |
8195 | } |
8196 | else | |
0fab7955 SM |
8197 | infrun_debug_printf ("step-over in progress: resume of %s deferred", |
8198 | tp->ptid.to_string ().c_str ()); | |
372316f1 | 8199 | } |
d4f3574e SS |
8200 | else |
8201 | { | |
31e77af2 | 8202 | struct regcache *regcache = get_current_regcache (); |
963f9c80 PA |
8203 | int remove_bp; |
8204 | int remove_wps; | |
8d297bbf | 8205 | step_over_what step_what; |
31e77af2 | 8206 | |
d4f3574e | 8207 | /* Either the trap was not expected, but we are continuing |
a9ba6bae PA |
8208 | anyway (if we got a signal, the user asked it be passed to |
8209 | the child) | |
8210 | -- or -- | |
8211 | We got our expected trap, but decided we should resume from | |
8212 | it. | |
d4f3574e | 8213 | |
a9ba6bae | 8214 | We're going to run this baby now! |
d4f3574e | 8215 | |
c36b740a VP |
8216 | Note that insert_breakpoints won't try to re-insert |
8217 | already inserted breakpoints. Therefore, we don't | |
8218 | care if breakpoints were already inserted, or not. */ | |
a9ba6bae | 8219 | |
31e77af2 PA |
8220 | /* If we need to step over a breakpoint, and we're not using |
8221 | displaced stepping to do so, insert all breakpoints | |
8222 | (watchpoints, etc.) but the one we're stepping over, step one | |
8223 | instruction, and then re-insert the breakpoint when that step | |
8224 | is finished. */ | |
963f9c80 | 8225 | |
6c4cfb24 PA |
8226 | step_what = thread_still_needs_step_over (ecs->event_thread); |
8227 | ||
963f9c80 | 8228 | remove_bp = (ecs->hit_singlestep_breakpoint |
6c4cfb24 PA |
8229 | || (step_what & STEP_OVER_BREAKPOINT)); |
8230 | remove_wps = (step_what & STEP_OVER_WATCHPOINT); | |
963f9c80 | 8231 | |
cb71640d PA |
8232 | /* We can't use displaced stepping if we need to step past a |
8233 | watchpoint. The instruction copied to the scratch pad would | |
8234 | still trigger the watchpoint. */ | |
8235 | if (remove_bp | |
3fc8eb30 | 8236 | && (remove_wps || !use_displaced_stepping (ecs->event_thread))) |
45e8c884 | 8237 | { |
a01bda52 | 8238 | set_step_over_info (regcache->aspace (), |
21edc42f YQ |
8239 | regcache_read_pc (regcache), remove_wps, |
8240 | ecs->event_thread->global_num); | |
45e8c884 | 8241 | } |
963f9c80 | 8242 | else if (remove_wps) |
21edc42f | 8243 | set_step_over_info (NULL, 0, remove_wps, -1); |
372316f1 PA |
8244 | |
8245 | /* If we now need to do an in-line step-over, we need to stop | |
8246 | all other threads. Note this must be done before | |
8247 | insert_breakpoints below, because that removes the breakpoint | |
8248 | we're about to step over, otherwise other threads could miss | |
8249 | it. */ | |
fbea99ea | 8250 | if (step_over_info_valid_p () && target_is_non_stop_p ()) |
4f5539f0 | 8251 | stop_all_threads ("starting in-line step-over"); |
abbb1732 | 8252 | |
31e77af2 | 8253 | /* Stop stepping if inserting breakpoints fails. */ |
a70b8144 | 8254 | try |
31e77af2 PA |
8255 | { |
8256 | insert_breakpoints (); | |
8257 | } | |
230d2906 | 8258 | catch (const gdb_exception_error &e) |
31e77af2 PA |
8259 | { |
8260 | exception_print (gdb_stderr, e); | |
22bcd14b | 8261 | stop_waiting (ecs); |
bdf2a94a | 8262 | clear_step_over_info (); |
31e77af2 | 8263 | return; |
d4f3574e SS |
8264 | } |
8265 | ||
963f9c80 | 8266 | ecs->event_thread->control.trap_expected = (remove_bp || remove_wps); |
d4f3574e | 8267 | |
1edb66d8 | 8268 | resume (ecs->event_thread->stop_signal ()); |
d4f3574e SS |
8269 | } |
8270 | ||
488f131b | 8271 | prepare_to_wait (ecs); |
d4f3574e SS |
8272 | } |
8273 | ||
4d9d9d04 PA |
8274 | /* Called when we should continue running the inferior, because the |
8275 | current event doesn't cause a user visible stop. This does the | |
8276 | resuming part; waiting for the next event is done elsewhere. */ | |
8277 | ||
8278 | static void | |
8279 | keep_going (struct execution_control_state *ecs) | |
8280 | { | |
8281 | if (ecs->event_thread->control.trap_expected | |
1edb66d8 | 8282 | && ecs->event_thread->stop_signal () == GDB_SIGNAL_TRAP) |
4d9d9d04 PA |
8283 | ecs->event_thread->control.trap_expected = 0; |
8284 | ||
1edb66d8 SM |
8285 | if (!signal_program[ecs->event_thread->stop_signal ()]) |
8286 | ecs->event_thread->set_stop_signal (GDB_SIGNAL_0); | |
4d9d9d04 PA |
8287 | keep_going_pass_signal (ecs); |
8288 | } | |
8289 | ||
104c1213 JM |
8290 | /* This function normally comes after a resume, before |
8291 | handle_inferior_event exits. It takes care of any last bits of | |
8292 | housekeeping, and sets the all-important wait_some_more flag. */ | |
cd0fc7c3 | 8293 | |
104c1213 JM |
8294 | static void |
8295 | prepare_to_wait (struct execution_control_state *ecs) | |
cd0fc7c3 | 8296 | { |
1eb8556f | 8297 | infrun_debug_printf ("prepare_to_wait"); |
104c1213 | 8298 | |
104c1213 | 8299 | ecs->wait_some_more = 1; |
0b333c5e | 8300 | |
42bd97a6 PA |
8301 | /* If the target can't async, emulate it by marking the infrun event |
8302 | handler such that as soon as we get back to the event-loop, we | |
8303 | immediately end up in fetch_inferior_event again calling | |
8304 | target_wait. */ | |
8305 | if (!target_can_async_p ()) | |
0b333c5e | 8306 | mark_infrun_async_event_handler (); |
c906108c | 8307 | } |
11cf8741 | 8308 | |
fd664c91 | 8309 | /* We are done with the step range of a step/next/si/ni command. |
b57bacec | 8310 | Called once for each n of a "step n" operation. */ |
fd664c91 PA |
8311 | |
8312 | static void | |
bdc36728 | 8313 | end_stepping_range (struct execution_control_state *ecs) |
fd664c91 | 8314 | { |
bdc36728 | 8315 | ecs->event_thread->control.stop_step = 1; |
bdc36728 | 8316 | stop_waiting (ecs); |
fd664c91 PA |
8317 | } |
8318 | ||
33d62d64 JK |
8319 | /* Several print_*_reason functions to print why the inferior has stopped. |
8320 | We always print something when the inferior exits, or receives a signal. | |
8321 | The rest of the cases are dealt with later on in normal_stop and | |
8322 | print_it_typical. Ideally there should be a call to one of these | |
8323 | print_*_reason functions functions from handle_inferior_event each time | |
22bcd14b | 8324 | stop_waiting is called. |
33d62d64 | 8325 | |
fd664c91 PA |
8326 | Note that we don't call these directly, instead we delegate that to |
8327 | the interpreters, through observers. Interpreters then call these | |
8328 | with whatever uiout is right. */ | |
33d62d64 | 8329 | |
fd664c91 PA |
8330 | void |
8331 | print_end_stepping_range_reason (struct ui_out *uiout) | |
33d62d64 | 8332 | { |
fd664c91 | 8333 | /* For CLI-like interpreters, print nothing. */ |
33d62d64 | 8334 | |
112e8700 | 8335 | if (uiout->is_mi_like_p ()) |
fd664c91 | 8336 | { |
112e8700 | 8337 | uiout->field_string ("reason", |
fd664c91 PA |
8338 | async_reason_lookup (EXEC_ASYNC_END_STEPPING_RANGE)); |
8339 | } | |
8340 | } | |
33d62d64 | 8341 | |
fd664c91 PA |
8342 | void |
8343 | print_signal_exited_reason (struct ui_out *uiout, enum gdb_signal siggnal) | |
11cf8741 | 8344 | { |
33d62d64 | 8345 | annotate_signalled (); |
112e8700 SM |
8346 | if (uiout->is_mi_like_p ()) |
8347 | uiout->field_string | |
8348 | ("reason", async_reason_lookup (EXEC_ASYNC_EXITED_SIGNALLED)); | |
8349 | uiout->text ("\nProgram terminated with signal "); | |
33d62d64 | 8350 | annotate_signal_name (); |
112e8700 | 8351 | uiout->field_string ("signal-name", |
2ea28649 | 8352 | gdb_signal_to_name (siggnal)); |
33d62d64 | 8353 | annotate_signal_name_end (); |
112e8700 | 8354 | uiout->text (", "); |
33d62d64 | 8355 | annotate_signal_string (); |
112e8700 | 8356 | uiout->field_string ("signal-meaning", |
2ea28649 | 8357 | gdb_signal_to_string (siggnal)); |
33d62d64 | 8358 | annotate_signal_string_end (); |
112e8700 SM |
8359 | uiout->text (".\n"); |
8360 | uiout->text ("The program no longer exists.\n"); | |
33d62d64 JK |
8361 | } |
8362 | ||
fd664c91 PA |
8363 | void |
8364 | print_exited_reason (struct ui_out *uiout, int exitstatus) | |
33d62d64 | 8365 | { |
fda326dd | 8366 | struct inferior *inf = current_inferior (); |
a068643d | 8367 | std::string pidstr = target_pid_to_str (ptid_t (inf->pid)); |
fda326dd | 8368 | |
33d62d64 JK |
8369 | annotate_exited (exitstatus); |
8370 | if (exitstatus) | |
8371 | { | |
112e8700 SM |
8372 | if (uiout->is_mi_like_p ()) |
8373 | uiout->field_string ("reason", async_reason_lookup (EXEC_ASYNC_EXITED)); | |
6a831f06 PA |
8374 | std::string exit_code_str |
8375 | = string_printf ("0%o", (unsigned int) exitstatus); | |
8376 | uiout->message ("[Inferior %s (%s) exited with code %pF]\n", | |
8377 | plongest (inf->num), pidstr.c_str (), | |
8378 | string_field ("exit-code", exit_code_str.c_str ())); | |
33d62d64 JK |
8379 | } |
8380 | else | |
11cf8741 | 8381 | { |
112e8700 SM |
8382 | if (uiout->is_mi_like_p ()) |
8383 | uiout->field_string | |
8384 | ("reason", async_reason_lookup (EXEC_ASYNC_EXITED_NORMALLY)); | |
6a831f06 PA |
8385 | uiout->message ("[Inferior %s (%s) exited normally]\n", |
8386 | plongest (inf->num), pidstr.c_str ()); | |
33d62d64 | 8387 | } |
33d62d64 JK |
8388 | } |
8389 | ||
fd664c91 PA |
8390 | void |
8391 | print_signal_received_reason (struct ui_out *uiout, enum gdb_signal siggnal) | |
33d62d64 | 8392 | { |
f303dbd6 PA |
8393 | struct thread_info *thr = inferior_thread (); |
8394 | ||
33d62d64 JK |
8395 | annotate_signal (); |
8396 | ||
112e8700 | 8397 | if (uiout->is_mi_like_p ()) |
f303dbd6 PA |
8398 | ; |
8399 | else if (show_thread_that_caused_stop ()) | |
33d62d64 | 8400 | { |
112e8700 | 8401 | uiout->text ("\nThread "); |
33eca680 | 8402 | uiout->field_string ("thread-id", print_thread_id (thr)); |
f303dbd6 | 8403 | |
25558938 | 8404 | const char *name = thread_name (thr); |
f303dbd6 PA |
8405 | if (name != NULL) |
8406 | { | |
112e8700 | 8407 | uiout->text (" \""); |
33eca680 | 8408 | uiout->field_string ("name", name); |
112e8700 | 8409 | uiout->text ("\""); |
f303dbd6 | 8410 | } |
33d62d64 | 8411 | } |
f303dbd6 | 8412 | else |
112e8700 | 8413 | uiout->text ("\nProgram"); |
f303dbd6 | 8414 | |
112e8700 SM |
8415 | if (siggnal == GDB_SIGNAL_0 && !uiout->is_mi_like_p ()) |
8416 | uiout->text (" stopped"); | |
33d62d64 JK |
8417 | else |
8418 | { | |
112e8700 | 8419 | uiout->text (" received signal "); |
8b93c638 | 8420 | annotate_signal_name (); |
112e8700 SM |
8421 | if (uiout->is_mi_like_p ()) |
8422 | uiout->field_string | |
8423 | ("reason", async_reason_lookup (EXEC_ASYNC_SIGNAL_RECEIVED)); | |
8424 | uiout->field_string ("signal-name", gdb_signal_to_name (siggnal)); | |
8b93c638 | 8425 | annotate_signal_name_end (); |
112e8700 | 8426 | uiout->text (", "); |
8b93c638 | 8427 | annotate_signal_string (); |
112e8700 | 8428 | uiout->field_string ("signal-meaning", gdb_signal_to_string (siggnal)); |
012b3a21 | 8429 | |
272bb05c JB |
8430 | struct regcache *regcache = get_current_regcache (); |
8431 | struct gdbarch *gdbarch = regcache->arch (); | |
8432 | if (gdbarch_report_signal_info_p (gdbarch)) | |
8433 | gdbarch_report_signal_info (gdbarch, uiout, siggnal); | |
8434 | ||
8b93c638 | 8435 | annotate_signal_string_end (); |
33d62d64 | 8436 | } |
112e8700 | 8437 | uiout->text (".\n"); |
33d62d64 | 8438 | } |
252fbfc8 | 8439 | |
fd664c91 PA |
8440 | void |
8441 | print_no_history_reason (struct ui_out *uiout) | |
33d62d64 | 8442 | { |
112e8700 | 8443 | uiout->text ("\nNo more reverse-execution history.\n"); |
11cf8741 | 8444 | } |
43ff13b4 | 8445 | |
0c7e1a46 PA |
8446 | /* Print current location without a level number, if we have changed |
8447 | functions or hit a breakpoint. Print source line if we have one. | |
8448 | bpstat_print contains the logic deciding in detail what to print, | |
8449 | based on the event(s) that just occurred. */ | |
8450 | ||
243a9253 | 8451 | static void |
c272a98c | 8452 | print_stop_location (const target_waitstatus &ws) |
0c7e1a46 PA |
8453 | { |
8454 | int bpstat_ret; | |
f486487f | 8455 | enum print_what source_flag; |
0c7e1a46 PA |
8456 | int do_frame_printing = 1; |
8457 | struct thread_info *tp = inferior_thread (); | |
8458 | ||
c272a98c | 8459 | bpstat_ret = bpstat_print (tp->control.stop_bpstat, ws.kind ()); |
0c7e1a46 PA |
8460 | switch (bpstat_ret) |
8461 | { | |
8462 | case PRINT_UNKNOWN: | |
8463 | /* FIXME: cagney/2002-12-01: Given that a frame ID does (or | |
8464 | should) carry around the function and does (or should) use | |
8465 | that when doing a frame comparison. */ | |
8466 | if (tp->control.stop_step | |
a0cbd650 TT |
8467 | && (tp->control.step_frame_id |
8468 | == get_frame_id (get_current_frame ())) | |
f2ffa92b | 8469 | && (tp->control.step_start_function |
1edb66d8 | 8470 | == find_pc_function (tp->stop_pc ()))) |
0c7e1a46 PA |
8471 | { |
8472 | /* Finished step, just print source line. */ | |
8473 | source_flag = SRC_LINE; | |
8474 | } | |
8475 | else | |
8476 | { | |
8477 | /* Print location and source line. */ | |
8478 | source_flag = SRC_AND_LOC; | |
8479 | } | |
8480 | break; | |
8481 | case PRINT_SRC_AND_LOC: | |
8482 | /* Print location and source line. */ | |
8483 | source_flag = SRC_AND_LOC; | |
8484 | break; | |
8485 | case PRINT_SRC_ONLY: | |
8486 | source_flag = SRC_LINE; | |
8487 | break; | |
8488 | case PRINT_NOTHING: | |
8489 | /* Something bogus. */ | |
8490 | source_flag = SRC_LINE; | |
8491 | do_frame_printing = 0; | |
8492 | break; | |
8493 | default: | |
f34652de | 8494 | internal_error (_("Unknown value.")); |
0c7e1a46 PA |
8495 | } |
8496 | ||
8497 | /* The behavior of this routine with respect to the source | |
8498 | flag is: | |
8499 | SRC_LINE: Print only source line | |
8500 | LOCATION: Print only location | |
8501 | SRC_AND_LOC: Print location and source line. */ | |
8502 | if (do_frame_printing) | |
8503 | print_stack_frame (get_selected_frame (NULL), 0, source_flag, 1); | |
243a9253 PA |
8504 | } |
8505 | ||
243a9253 PA |
8506 | /* See infrun.h. */ |
8507 | ||
8508 | void | |
4c7d57e7 | 8509 | print_stop_event (struct ui_out *uiout, bool displays) |
243a9253 | 8510 | { |
243a9253 | 8511 | struct target_waitstatus last; |
243a9253 PA |
8512 | struct thread_info *tp; |
8513 | ||
5b6d1e4f | 8514 | get_last_target_status (nullptr, nullptr, &last); |
243a9253 | 8515 | |
67ad9399 TT |
8516 | { |
8517 | scoped_restore save_uiout = make_scoped_restore (¤t_uiout, uiout); | |
0c7e1a46 | 8518 | |
c272a98c | 8519 | print_stop_location (last); |
243a9253 | 8520 | |
67ad9399 | 8521 | /* Display the auto-display expressions. */ |
4c7d57e7 TT |
8522 | if (displays) |
8523 | do_displays (); | |
67ad9399 | 8524 | } |
243a9253 PA |
8525 | |
8526 | tp = inferior_thread (); | |
573269a8 LS |
8527 | if (tp->thread_fsm () != nullptr |
8528 | && tp->thread_fsm ()->finished_p ()) | |
243a9253 PA |
8529 | { |
8530 | struct return_value_info *rv; | |
8531 | ||
573269a8 LS |
8532 | rv = tp->thread_fsm ()->return_value (); |
8533 | if (rv != nullptr) | |
243a9253 PA |
8534 | print_return_value (uiout, rv); |
8535 | } | |
0c7e1a46 PA |
8536 | } |
8537 | ||
388a7084 PA |
8538 | /* See infrun.h. */ |
8539 | ||
8540 | void | |
8541 | maybe_remove_breakpoints (void) | |
8542 | { | |
55f6301a | 8543 | if (!breakpoints_should_be_inserted_now () && target_has_execution ()) |
388a7084 PA |
8544 | { |
8545 | if (remove_breakpoints ()) | |
8546 | { | |
223ffa71 | 8547 | target_terminal::ours_for_output (); |
6cb06a8c TT |
8548 | gdb_printf (_("Cannot remove breakpoints because " |
8549 | "program is no longer writable.\nFurther " | |
8550 | "execution is probably impossible.\n")); | |
388a7084 PA |
8551 | } |
8552 | } | |
8553 | } | |
8554 | ||
4c2f2a79 PA |
8555 | /* The execution context that just caused a normal stop. */ |
8556 | ||
8557 | struct stop_context | |
8558 | { | |
2d844eaf | 8559 | stop_context (); |
2d844eaf TT |
8560 | |
8561 | DISABLE_COPY_AND_ASSIGN (stop_context); | |
8562 | ||
8563 | bool changed () const; | |
8564 | ||
4c2f2a79 PA |
8565 | /* The stop ID. */ |
8566 | ULONGEST stop_id; | |
c906108c | 8567 | |
4c2f2a79 | 8568 | /* The event PTID. */ |
c906108c | 8569 | |
4c2f2a79 PA |
8570 | ptid_t ptid; |
8571 | ||
8572 | /* If stopp for a thread event, this is the thread that caused the | |
8573 | stop. */ | |
d634cd0b | 8574 | thread_info_ref thread; |
4c2f2a79 PA |
8575 | |
8576 | /* The inferior that caused the stop. */ | |
8577 | int inf_num; | |
8578 | }; | |
8579 | ||
2d844eaf | 8580 | /* Initializes a new stop context. If stopped for a thread event, this |
4c2f2a79 PA |
8581 | takes a strong reference to the thread. */ |
8582 | ||
2d844eaf | 8583 | stop_context::stop_context () |
4c2f2a79 | 8584 | { |
2d844eaf TT |
8585 | stop_id = get_stop_id (); |
8586 | ptid = inferior_ptid; | |
8587 | inf_num = current_inferior ()->num; | |
4c2f2a79 | 8588 | |
d7e15655 | 8589 | if (inferior_ptid != null_ptid) |
4c2f2a79 PA |
8590 | { |
8591 | /* Take a strong reference so that the thread can't be deleted | |
8592 | yet. */ | |
d634cd0b | 8593 | thread = thread_info_ref::new_reference (inferior_thread ()); |
4c2f2a79 | 8594 | } |
4c2f2a79 PA |
8595 | } |
8596 | ||
8597 | /* Return true if the current context no longer matches the saved stop | |
8598 | context. */ | |
8599 | ||
2d844eaf TT |
8600 | bool |
8601 | stop_context::changed () const | |
8602 | { | |
8603 | if (ptid != inferior_ptid) | |
8604 | return true; | |
8605 | if (inf_num != current_inferior ()->num) | |
8606 | return true; | |
8607 | if (thread != NULL && thread->state != THREAD_STOPPED) | |
8608 | return true; | |
8609 | if (get_stop_id () != stop_id) | |
8610 | return true; | |
8611 | return false; | |
4c2f2a79 PA |
8612 | } |
8613 | ||
8614 | /* See infrun.h. */ | |
8615 | ||
8616 | int | |
96baa820 | 8617 | normal_stop (void) |
c906108c | 8618 | { |
73b65bb0 | 8619 | struct target_waitstatus last; |
73b65bb0 | 8620 | |
5b6d1e4f | 8621 | get_last_target_status (nullptr, nullptr, &last); |
73b65bb0 | 8622 | |
4c2f2a79 PA |
8623 | new_stop_id (); |
8624 | ||
29f49a6a PA |
8625 | /* If an exception is thrown from this point on, make sure to |
8626 | propagate GDB's knowledge of the executing state to the | |
8627 | frontend/user running state. A QUIT is an easy exception to see | |
8628 | here, so do this before any filtered output. */ | |
731f534f | 8629 | |
5b6d1e4f | 8630 | ptid_t finish_ptid = null_ptid; |
731f534f | 8631 | |
c35b1492 | 8632 | if (!non_stop) |
5b6d1e4f | 8633 | finish_ptid = minus_one_ptid; |
183be222 SM |
8634 | else if (last.kind () == TARGET_WAITKIND_SIGNALLED |
8635 | || last.kind () == TARGET_WAITKIND_EXITED) | |
e1316e60 PA |
8636 | { |
8637 | /* On some targets, we may still have live threads in the | |
8638 | inferior when we get a process exit event. E.g., for | |
8639 | "checkpoint", when the current checkpoint/fork exits, | |
8640 | linux-fork.c automatically switches to another fork from | |
8641 | within target_mourn_inferior. */ | |
731f534f | 8642 | if (inferior_ptid != null_ptid) |
5b6d1e4f | 8643 | finish_ptid = ptid_t (inferior_ptid.pid ()); |
e1316e60 | 8644 | } |
183be222 | 8645 | else if (last.kind () != TARGET_WAITKIND_NO_RESUMED) |
5b6d1e4f PA |
8646 | finish_ptid = inferior_ptid; |
8647 | ||
8648 | gdb::optional<scoped_finish_thread_state> maybe_finish_thread_state; | |
8649 | if (finish_ptid != null_ptid) | |
8650 | { | |
8651 | maybe_finish_thread_state.emplace | |
8652 | (user_visible_resume_target (finish_ptid), finish_ptid); | |
8653 | } | |
29f49a6a | 8654 | |
b57bacec PA |
8655 | /* As we're presenting a stop, and potentially removing breakpoints, |
8656 | update the thread list so we can tell whether there are threads | |
8657 | running on the target. With target remote, for example, we can | |
8658 | only learn about new threads when we explicitly update the thread | |
8659 | list. Do this before notifying the interpreters about signal | |
8660 | stops, end of stepping ranges, etc., so that the "new thread" | |
8661 | output is emitted before e.g., "Program received signal FOO", | |
8662 | instead of after. */ | |
8663 | update_thread_list (); | |
8664 | ||
183be222 | 8665 | if (last.kind () == TARGET_WAITKIND_STOPPED && stopped_by_random_signal) |
1edb66d8 | 8666 | gdb::observers::signal_received.notify (inferior_thread ()->stop_signal ()); |
b57bacec | 8667 | |
c906108c SS |
8668 | /* As with the notification of thread events, we want to delay |
8669 | notifying the user that we've switched thread context until | |
8670 | the inferior actually stops. | |
8671 | ||
73b65bb0 DJ |
8672 | There's no point in saying anything if the inferior has exited. |
8673 | Note that SIGNALLED here means "exited with a signal", not | |
b65dc60b PA |
8674 | "received a signal". |
8675 | ||
8676 | Also skip saying anything in non-stop mode. In that mode, as we | |
8677 | don't want GDB to switch threads behind the user's back, to avoid | |
8678 | races where the user is typing a command to apply to thread x, | |
8679 | but GDB switches to thread y before the user finishes entering | |
8680 | the command, fetch_inferior_event installs a cleanup to restore | |
8681 | the current thread back to the thread the user had selected right | |
8682 | after this event is handled, so we're not really switching, only | |
8683 | informing of a stop. */ | |
4f8d22e3 | 8684 | if (!non_stop |
731f534f | 8685 | && previous_inferior_ptid != inferior_ptid |
55f6301a | 8686 | && target_has_execution () |
183be222 SM |
8687 | && last.kind () != TARGET_WAITKIND_SIGNALLED |
8688 | && last.kind () != TARGET_WAITKIND_EXITED | |
8689 | && last.kind () != TARGET_WAITKIND_NO_RESUMED) | |
c906108c | 8690 | { |
0e454242 | 8691 | SWITCH_THRU_ALL_UIS () |
3b12939d | 8692 | { |
223ffa71 | 8693 | target_terminal::ours_for_output (); |
6cb06a8c TT |
8694 | gdb_printf (_("[Switching to %s]\n"), |
8695 | target_pid_to_str (inferior_ptid).c_str ()); | |
3b12939d PA |
8696 | annotate_thread_changed (); |
8697 | } | |
39f77062 | 8698 | previous_inferior_ptid = inferior_ptid; |
c906108c | 8699 | } |
c906108c | 8700 | |
183be222 | 8701 | if (last.kind () == TARGET_WAITKIND_NO_RESUMED) |
0e5bf2a8 | 8702 | { |
0e454242 | 8703 | SWITCH_THRU_ALL_UIS () |
3b12939d PA |
8704 | if (current_ui->prompt_state == PROMPT_BLOCKED) |
8705 | { | |
223ffa71 | 8706 | target_terminal::ours_for_output (); |
6cb06a8c | 8707 | gdb_printf (_("No unwaited-for children left.\n")); |
3b12939d | 8708 | } |
0e5bf2a8 PA |
8709 | } |
8710 | ||
b57bacec | 8711 | /* Note: this depends on the update_thread_list call above. */ |
388a7084 | 8712 | maybe_remove_breakpoints (); |
c906108c | 8713 | |
c906108c SS |
8714 | /* If an auto-display called a function and that got a signal, |
8715 | delete that auto-display to avoid an infinite recursion. */ | |
8716 | ||
8717 | if (stopped_by_random_signal) | |
8718 | disable_current_display (); | |
8719 | ||
0e454242 | 8720 | SWITCH_THRU_ALL_UIS () |
3b12939d PA |
8721 | { |
8722 | async_enable_stdin (); | |
8723 | } | |
c906108c | 8724 | |
388a7084 | 8725 | /* Let the user/frontend see the threads as stopped. */ |
731f534f | 8726 | maybe_finish_thread_state.reset (); |
388a7084 PA |
8727 | |
8728 | /* Select innermost stack frame - i.e., current frame is frame 0, | |
8729 | and current location is based on that. Handle the case where the | |
8730 | dummy call is returning after being stopped. E.g. the dummy call | |
8731 | previously hit a breakpoint. (If the dummy call returns | |
8732 | normally, we won't reach here.) Do this before the stop hook is | |
8733 | run, so that it doesn't get to see the temporary dummy frame, | |
8734 | which is not where we'll present the stop. */ | |
8735 | if (has_stack_frames ()) | |
8736 | { | |
8737 | if (stop_stack_dummy == STOP_STACK_DUMMY) | |
8738 | { | |
8739 | /* Pop the empty frame that contains the stack dummy. This | |
8740 | also restores inferior state prior to the call (struct | |
8741 | infcall_suspend_state). */ | |
bd2b40ac | 8742 | frame_info_ptr frame = get_current_frame (); |
388a7084 PA |
8743 | |
8744 | gdb_assert (get_frame_type (frame) == DUMMY_FRAME); | |
8745 | frame_pop (frame); | |
8746 | /* frame_pop calls reinit_frame_cache as the last thing it | |
8747 | does which means there's now no selected frame. */ | |
8748 | } | |
8749 | ||
8750 | select_frame (get_current_frame ()); | |
8751 | ||
8752 | /* Set the current source location. */ | |
8753 | set_current_sal_from_frame (get_current_frame ()); | |
8754 | } | |
dd7e2d2b PA |
8755 | |
8756 | /* Look up the hook_stop and run it (CLI internally handles problem | |
8757 | of stop_command's pre-hook not existing). */ | |
49a82d50 | 8758 | stop_context saved_context; |
4c2f2a79 | 8759 | |
49a82d50 TT |
8760 | try |
8761 | { | |
8762 | execute_cmd_pre_hook (stop_command); | |
4c2f2a79 | 8763 | } |
49a82d50 TT |
8764 | catch (const gdb_exception &ex) |
8765 | { | |
8766 | exception_fprintf (gdb_stderr, ex, | |
8767 | "Error while running hook_stop:\n"); | |
8768 | } | |
8769 | ||
8770 | /* If the stop hook resumes the target, then there's no point in | |
8771 | trying to notify about the previous stop; its context is | |
8772 | gone. Likewise if the command switches thread or inferior -- | |
8773 | the observers would print a stop for the wrong | |
8774 | thread/inferior. */ | |
8775 | if (saved_context.changed ()) | |
8776 | return 1; | |
dd7e2d2b | 8777 | |
388a7084 PA |
8778 | /* Notify observers about the stop. This is where the interpreters |
8779 | print the stop event. */ | |
d7e15655 | 8780 | if (inferior_ptid != null_ptid) |
76727919 | 8781 | gdb::observers::normal_stop.notify (inferior_thread ()->control.stop_bpstat, |
24a7f1b5 | 8782 | stop_print_frame); |
388a7084 | 8783 | else |
76727919 | 8784 | gdb::observers::normal_stop.notify (NULL, stop_print_frame); |
347bddb7 | 8785 | |
243a9253 PA |
8786 | annotate_stopped (); |
8787 | ||
55f6301a | 8788 | if (target_has_execution ()) |
48844aa6 | 8789 | { |
183be222 SM |
8790 | if (last.kind () != TARGET_WAITKIND_SIGNALLED |
8791 | && last.kind () != TARGET_WAITKIND_EXITED | |
8792 | && last.kind () != TARGET_WAITKIND_NO_RESUMED) | |
48844aa6 PA |
8793 | /* Delete the breakpoint we stopped at, if it wants to be deleted. |
8794 | Delete any breakpoint that is to be deleted at the next stop. */ | |
16c381f0 | 8795 | breakpoint_auto_delete (inferior_thread ()->control.stop_bpstat); |
94cc34af | 8796 | } |
6c95b8df | 8797 | |
4c2f2a79 | 8798 | return 0; |
c906108c | 8799 | } |
c906108c | 8800 | \f |
c5aa993b | 8801 | int |
96baa820 | 8802 | signal_stop_state (int signo) |
c906108c | 8803 | { |
d6b48e9c | 8804 | return signal_stop[signo]; |
c906108c SS |
8805 | } |
8806 | ||
c5aa993b | 8807 | int |
96baa820 | 8808 | signal_print_state (int signo) |
c906108c SS |
8809 | { |
8810 | return signal_print[signo]; | |
8811 | } | |
8812 | ||
c5aa993b | 8813 | int |
96baa820 | 8814 | signal_pass_state (int signo) |
c906108c SS |
8815 | { |
8816 | return signal_program[signo]; | |
8817 | } | |
8818 | ||
2455069d UW |
8819 | static void |
8820 | signal_cache_update (int signo) | |
8821 | { | |
8822 | if (signo == -1) | |
8823 | { | |
a493e3e2 | 8824 | for (signo = 0; signo < (int) GDB_SIGNAL_LAST; signo++) |
2455069d UW |
8825 | signal_cache_update (signo); |
8826 | ||
8827 | return; | |
8828 | } | |
8829 | ||
8830 | signal_pass[signo] = (signal_stop[signo] == 0 | |
8831 | && signal_print[signo] == 0 | |
ab04a2af TT |
8832 | && signal_program[signo] == 1 |
8833 | && signal_catch[signo] == 0); | |
2455069d UW |
8834 | } |
8835 | ||
488f131b | 8836 | int |
7bda5e4a | 8837 | signal_stop_update (int signo, int state) |
d4f3574e SS |
8838 | { |
8839 | int ret = signal_stop[signo]; | |
abbb1732 | 8840 | |
d4f3574e | 8841 | signal_stop[signo] = state; |
2455069d | 8842 | signal_cache_update (signo); |
d4f3574e SS |
8843 | return ret; |
8844 | } | |
8845 | ||
488f131b | 8846 | int |
7bda5e4a | 8847 | signal_print_update (int signo, int state) |
d4f3574e SS |
8848 | { |
8849 | int ret = signal_print[signo]; | |
abbb1732 | 8850 | |
d4f3574e | 8851 | signal_print[signo] = state; |
2455069d | 8852 | signal_cache_update (signo); |
d4f3574e SS |
8853 | return ret; |
8854 | } | |
8855 | ||
488f131b | 8856 | int |
7bda5e4a | 8857 | signal_pass_update (int signo, int state) |
d4f3574e SS |
8858 | { |
8859 | int ret = signal_program[signo]; | |
abbb1732 | 8860 | |
d4f3574e | 8861 | signal_program[signo] = state; |
2455069d | 8862 | signal_cache_update (signo); |
d4f3574e SS |
8863 | return ret; |
8864 | } | |
8865 | ||
ab04a2af TT |
8866 | /* Update the global 'signal_catch' from INFO and notify the |
8867 | target. */ | |
8868 | ||
8869 | void | |
8870 | signal_catch_update (const unsigned int *info) | |
8871 | { | |
8872 | int i; | |
8873 | ||
8874 | for (i = 0; i < GDB_SIGNAL_LAST; ++i) | |
8875 | signal_catch[i] = info[i] > 0; | |
8876 | signal_cache_update (-1); | |
adc6a863 | 8877 | target_pass_signals (signal_pass); |
ab04a2af TT |
8878 | } |
8879 | ||
c906108c | 8880 | static void |
96baa820 | 8881 | sig_print_header (void) |
c906108c | 8882 | { |
6cb06a8c TT |
8883 | gdb_printf (_("Signal Stop\tPrint\tPass " |
8884 | "to program\tDescription\n")); | |
c906108c SS |
8885 | } |
8886 | ||
8887 | static void | |
2ea28649 | 8888 | sig_print_info (enum gdb_signal oursig) |
c906108c | 8889 | { |
2ea28649 | 8890 | const char *name = gdb_signal_to_name (oursig); |
c906108c | 8891 | int name_padding = 13 - strlen (name); |
96baa820 | 8892 | |
c906108c SS |
8893 | if (name_padding <= 0) |
8894 | name_padding = 0; | |
8895 | ||
6cb06a8c TT |
8896 | gdb_printf ("%s", name); |
8897 | gdb_printf ("%*.*s ", name_padding, name_padding, " "); | |
8898 | gdb_printf ("%s\t", signal_stop[oursig] ? "Yes" : "No"); | |
8899 | gdb_printf ("%s\t", signal_print[oursig] ? "Yes" : "No"); | |
8900 | gdb_printf ("%s\t\t", signal_program[oursig] ? "Yes" : "No"); | |
8901 | gdb_printf ("%s\n", gdb_signal_to_string (oursig)); | |
c906108c SS |
8902 | } |
8903 | ||
8904 | /* Specify how various signals in the inferior should be handled. */ | |
8905 | ||
8906 | static void | |
0b39b52e | 8907 | handle_command (const char *args, int from_tty) |
c906108c | 8908 | { |
c906108c | 8909 | int digits, wordlen; |
b926417a | 8910 | int sigfirst, siglast; |
2ea28649 | 8911 | enum gdb_signal oursig; |
c906108c | 8912 | int allsigs; |
c906108c SS |
8913 | |
8914 | if (args == NULL) | |
8915 | { | |
e2e0b3e5 | 8916 | error_no_arg (_("signal to handle")); |
c906108c SS |
8917 | } |
8918 | ||
1777feb0 | 8919 | /* Allocate and zero an array of flags for which signals to handle. */ |
c906108c | 8920 | |
adc6a863 PA |
8921 | const size_t nsigs = GDB_SIGNAL_LAST; |
8922 | unsigned char sigs[nsigs] {}; | |
c906108c | 8923 | |
1777feb0 | 8924 | /* Break the command line up into args. */ |
c906108c | 8925 | |
773a1edc | 8926 | gdb_argv built_argv (args); |
c906108c SS |
8927 | |
8928 | /* Walk through the args, looking for signal oursigs, signal names, and | |
8929 | actions. Signal numbers and signal names may be interspersed with | |
8930 | actions, with the actions being performed for all signals cumulatively | |
1777feb0 | 8931 | specified. Signal ranges can be specified as <LOW>-<HIGH>. */ |
c906108c | 8932 | |
773a1edc | 8933 | for (char *arg : built_argv) |
c906108c | 8934 | { |
773a1edc TT |
8935 | wordlen = strlen (arg); |
8936 | for (digits = 0; isdigit (arg[digits]); digits++) | |
c906108c SS |
8937 | {; |
8938 | } | |
8939 | allsigs = 0; | |
8940 | sigfirst = siglast = -1; | |
8941 | ||
773a1edc | 8942 | if (wordlen >= 1 && !strncmp (arg, "all", wordlen)) |
c906108c SS |
8943 | { |
8944 | /* Apply action to all signals except those used by the | |
1777feb0 | 8945 | debugger. Silently skip those. */ |
c906108c SS |
8946 | allsigs = 1; |
8947 | sigfirst = 0; | |
8948 | siglast = nsigs - 1; | |
8949 | } | |
773a1edc | 8950 | else if (wordlen >= 1 && !strncmp (arg, "stop", wordlen)) |
c906108c SS |
8951 | { |
8952 | SET_SIGS (nsigs, sigs, signal_stop); | |
8953 | SET_SIGS (nsigs, sigs, signal_print); | |
8954 | } | |
773a1edc | 8955 | else if (wordlen >= 1 && !strncmp (arg, "ignore", wordlen)) |
c906108c SS |
8956 | { |
8957 | UNSET_SIGS (nsigs, sigs, signal_program); | |
8958 | } | |
773a1edc | 8959 | else if (wordlen >= 2 && !strncmp (arg, "print", wordlen)) |
c906108c SS |
8960 | { |
8961 | SET_SIGS (nsigs, sigs, signal_print); | |
8962 | } | |
773a1edc | 8963 | else if (wordlen >= 2 && !strncmp (arg, "pass", wordlen)) |
c906108c SS |
8964 | { |
8965 | SET_SIGS (nsigs, sigs, signal_program); | |
8966 | } | |
773a1edc | 8967 | else if (wordlen >= 3 && !strncmp (arg, "nostop", wordlen)) |
c906108c SS |
8968 | { |
8969 | UNSET_SIGS (nsigs, sigs, signal_stop); | |
8970 | } | |
773a1edc | 8971 | else if (wordlen >= 3 && !strncmp (arg, "noignore", wordlen)) |
c906108c SS |
8972 | { |
8973 | SET_SIGS (nsigs, sigs, signal_program); | |
8974 | } | |
773a1edc | 8975 | else if (wordlen >= 4 && !strncmp (arg, "noprint", wordlen)) |
c906108c SS |
8976 | { |
8977 | UNSET_SIGS (nsigs, sigs, signal_print); | |
8978 | UNSET_SIGS (nsigs, sigs, signal_stop); | |
8979 | } | |
773a1edc | 8980 | else if (wordlen >= 4 && !strncmp (arg, "nopass", wordlen)) |
c906108c SS |
8981 | { |
8982 | UNSET_SIGS (nsigs, sigs, signal_program); | |
8983 | } | |
8984 | else if (digits > 0) | |
8985 | { | |
8986 | /* It is numeric. The numeric signal refers to our own | |
8987 | internal signal numbering from target.h, not to host/target | |
8988 | signal number. This is a feature; users really should be | |
8989 | using symbolic names anyway, and the common ones like | |
8990 | SIGHUP, SIGINT, SIGALRM, etc. will work right anyway. */ | |
8991 | ||
8992 | sigfirst = siglast = (int) | |
773a1edc TT |
8993 | gdb_signal_from_command (atoi (arg)); |
8994 | if (arg[digits] == '-') | |
c906108c SS |
8995 | { |
8996 | siglast = (int) | |
773a1edc | 8997 | gdb_signal_from_command (atoi (arg + digits + 1)); |
c906108c SS |
8998 | } |
8999 | if (sigfirst > siglast) | |
9000 | { | |
1777feb0 | 9001 | /* Bet he didn't figure we'd think of this case... */ |
b926417a | 9002 | std::swap (sigfirst, siglast); |
c906108c SS |
9003 | } |
9004 | } | |
9005 | else | |
9006 | { | |
773a1edc | 9007 | oursig = gdb_signal_from_name (arg); |
a493e3e2 | 9008 | if (oursig != GDB_SIGNAL_UNKNOWN) |
c906108c SS |
9009 | { |
9010 | sigfirst = siglast = (int) oursig; | |
9011 | } | |
9012 | else | |
9013 | { | |
9014 | /* Not a number and not a recognized flag word => complain. */ | |
773a1edc | 9015 | error (_("Unrecognized or ambiguous flag word: \"%s\"."), arg); |
c906108c SS |
9016 | } |
9017 | } | |
9018 | ||
9019 | /* If any signal numbers or symbol names were found, set flags for | |
dda83cd7 | 9020 | which signals to apply actions to. */ |
c906108c | 9021 | |
b926417a | 9022 | for (int signum = sigfirst; signum >= 0 && signum <= siglast; signum++) |
c906108c | 9023 | { |
2ea28649 | 9024 | switch ((enum gdb_signal) signum) |
c906108c | 9025 | { |
a493e3e2 PA |
9026 | case GDB_SIGNAL_TRAP: |
9027 | case GDB_SIGNAL_INT: | |
c906108c SS |
9028 | if (!allsigs && !sigs[signum]) |
9029 | { | |
9e2f0ad4 | 9030 | if (query (_("%s is used by the debugger.\n\ |
3e43a32a | 9031 | Are you sure you want to change it? "), |
2ea28649 | 9032 | gdb_signal_to_name ((enum gdb_signal) signum))) |
c906108c SS |
9033 | { |
9034 | sigs[signum] = 1; | |
9035 | } | |
9036 | else | |
6cb06a8c | 9037 | gdb_printf (_("Not confirmed, unchanged.\n")); |
c906108c SS |
9038 | } |
9039 | break; | |
a493e3e2 PA |
9040 | case GDB_SIGNAL_0: |
9041 | case GDB_SIGNAL_DEFAULT: | |
9042 | case GDB_SIGNAL_UNKNOWN: | |
c906108c SS |
9043 | /* Make sure that "all" doesn't print these. */ |
9044 | break; | |
9045 | default: | |
9046 | sigs[signum] = 1; | |
9047 | break; | |
9048 | } | |
9049 | } | |
c906108c SS |
9050 | } |
9051 | ||
b926417a | 9052 | for (int signum = 0; signum < nsigs; signum++) |
3a031f65 PA |
9053 | if (sigs[signum]) |
9054 | { | |
2455069d | 9055 | signal_cache_update (-1); |
adc6a863 PA |
9056 | target_pass_signals (signal_pass); |
9057 | target_program_signals (signal_program); | |
c906108c | 9058 | |
3a031f65 PA |
9059 | if (from_tty) |
9060 | { | |
9061 | /* Show the results. */ | |
9062 | sig_print_header (); | |
9063 | for (; signum < nsigs; signum++) | |
9064 | if (sigs[signum]) | |
aead7601 | 9065 | sig_print_info ((enum gdb_signal) signum); |
3a031f65 PA |
9066 | } |
9067 | ||
9068 | break; | |
9069 | } | |
c906108c SS |
9070 | } |
9071 | ||
de0bea00 MF |
9072 | /* Complete the "handle" command. */ |
9073 | ||
eb3ff9a5 | 9074 | static void |
de0bea00 | 9075 | handle_completer (struct cmd_list_element *ignore, |
eb3ff9a5 | 9076 | completion_tracker &tracker, |
6f937416 | 9077 | const char *text, const char *word) |
de0bea00 | 9078 | { |
de0bea00 MF |
9079 | static const char * const keywords[] = |
9080 | { | |
9081 | "all", | |
9082 | "stop", | |
9083 | "ignore", | |
9084 | "print", | |
9085 | "pass", | |
9086 | "nostop", | |
9087 | "noignore", | |
9088 | "noprint", | |
9089 | "nopass", | |
9090 | NULL, | |
9091 | }; | |
9092 | ||
eb3ff9a5 PA |
9093 | signal_completer (ignore, tracker, text, word); |
9094 | complete_on_enum (tracker, keywords, word, word); | |
de0bea00 MF |
9095 | } |
9096 | ||
2ea28649 PA |
9097 | enum gdb_signal |
9098 | gdb_signal_from_command (int num) | |
ed01b82c PA |
9099 | { |
9100 | if (num >= 1 && num <= 15) | |
2ea28649 | 9101 | return (enum gdb_signal) num; |
ed01b82c PA |
9102 | error (_("Only signals 1-15 are valid as numeric signals.\n\ |
9103 | Use \"info signals\" for a list of symbolic signals.")); | |
9104 | } | |
9105 | ||
c906108c SS |
9106 | /* Print current contents of the tables set by the handle command. |
9107 | It is possible we should just be printing signals actually used | |
9108 | by the current target (but for things to work right when switching | |
9109 | targets, all signals should be in the signal tables). */ | |
9110 | ||
9111 | static void | |
1d12d88f | 9112 | info_signals_command (const char *signum_exp, int from_tty) |
c906108c | 9113 | { |
2ea28649 | 9114 | enum gdb_signal oursig; |
abbb1732 | 9115 | |
c906108c SS |
9116 | sig_print_header (); |
9117 | ||
9118 | if (signum_exp) | |
9119 | { | |
9120 | /* First see if this is a symbol name. */ | |
2ea28649 | 9121 | oursig = gdb_signal_from_name (signum_exp); |
a493e3e2 | 9122 | if (oursig == GDB_SIGNAL_UNKNOWN) |
c906108c SS |
9123 | { |
9124 | /* No, try numeric. */ | |
9125 | oursig = | |
2ea28649 | 9126 | gdb_signal_from_command (parse_and_eval_long (signum_exp)); |
c906108c SS |
9127 | } |
9128 | sig_print_info (oursig); | |
9129 | return; | |
9130 | } | |
9131 | ||
6cb06a8c | 9132 | gdb_printf ("\n"); |
c906108c | 9133 | /* These ugly casts brought to you by the native VAX compiler. */ |
a493e3e2 PA |
9134 | for (oursig = GDB_SIGNAL_FIRST; |
9135 | (int) oursig < (int) GDB_SIGNAL_LAST; | |
2ea28649 | 9136 | oursig = (enum gdb_signal) ((int) oursig + 1)) |
c906108c SS |
9137 | { |
9138 | QUIT; | |
9139 | ||
a493e3e2 PA |
9140 | if (oursig != GDB_SIGNAL_UNKNOWN |
9141 | && oursig != GDB_SIGNAL_DEFAULT && oursig != GDB_SIGNAL_0) | |
c906108c SS |
9142 | sig_print_info (oursig); |
9143 | } | |
9144 | ||
6cb06a8c TT |
9145 | gdb_printf (_("\nUse the \"handle\" command " |
9146 | "to change these tables.\n")); | |
c906108c | 9147 | } |
4aa995e1 PA |
9148 | |
9149 | /* The $_siginfo convenience variable is a bit special. We don't know | |
9150 | for sure the type of the value until we actually have a chance to | |
7a9dd1b2 | 9151 | fetch the data. The type can change depending on gdbarch, so it is |
4aa995e1 PA |
9152 | also dependent on which thread you have selected. |
9153 | ||
9154 | 1. making $_siginfo be an internalvar that creates a new value on | |
9155 | access. | |
9156 | ||
9157 | 2. making the value of $_siginfo be an lval_computed value. */ | |
9158 | ||
9159 | /* This function implements the lval_computed support for reading a | |
9160 | $_siginfo value. */ | |
9161 | ||
9162 | static void | |
9163 | siginfo_value_read (struct value *v) | |
9164 | { | |
9165 | LONGEST transferred; | |
9166 | ||
a911d87a PA |
9167 | /* If we can access registers, so can we access $_siginfo. Likewise |
9168 | vice versa. */ | |
9169 | validate_registers_access (); | |
c709acd1 | 9170 | |
4aa995e1 | 9171 | transferred = |
328d42d8 SM |
9172 | target_read (current_inferior ()->top_target (), |
9173 | TARGET_OBJECT_SIGNAL_INFO, | |
4aa995e1 | 9174 | NULL, |
50888e42 | 9175 | value_contents_all_raw (v).data (), |
4aa995e1 | 9176 | value_offset (v), |
df86565b | 9177 | value_type (v)->length ()); |
4aa995e1 | 9178 | |
df86565b | 9179 | if (transferred != value_type (v)->length ()) |
4aa995e1 PA |
9180 | error (_("Unable to read siginfo")); |
9181 | } | |
9182 | ||
9183 | /* This function implements the lval_computed support for writing a | |
9184 | $_siginfo value. */ | |
9185 | ||
9186 | static void | |
9187 | siginfo_value_write (struct value *v, struct value *fromval) | |
9188 | { | |
9189 | LONGEST transferred; | |
9190 | ||
a911d87a PA |
9191 | /* If we can access registers, so can we access $_siginfo. Likewise |
9192 | vice versa. */ | |
9193 | validate_registers_access (); | |
c709acd1 | 9194 | |
328d42d8 | 9195 | transferred = target_write (current_inferior ()->top_target (), |
4aa995e1 PA |
9196 | TARGET_OBJECT_SIGNAL_INFO, |
9197 | NULL, | |
50888e42 | 9198 | value_contents_all_raw (fromval).data (), |
4aa995e1 | 9199 | value_offset (v), |
df86565b | 9200 | value_type (fromval)->length ()); |
4aa995e1 | 9201 | |
df86565b | 9202 | if (transferred != value_type (fromval)->length ()) |
4aa995e1 PA |
9203 | error (_("Unable to write siginfo")); |
9204 | } | |
9205 | ||
c8f2448a | 9206 | static const struct lval_funcs siginfo_value_funcs = |
4aa995e1 PA |
9207 | { |
9208 | siginfo_value_read, | |
9209 | siginfo_value_write | |
9210 | }; | |
9211 | ||
9212 | /* Return a new value with the correct type for the siginfo object of | |
78267919 UW |
9213 | the current thread using architecture GDBARCH. Return a void value |
9214 | if there's no object available. */ | |
4aa995e1 | 9215 | |
2c0b251b | 9216 | static struct value * |
22d2b532 SDJ |
9217 | siginfo_make_value (struct gdbarch *gdbarch, struct internalvar *var, |
9218 | void *ignore) | |
4aa995e1 | 9219 | { |
841de120 | 9220 | if (target_has_stack () |
d7e15655 | 9221 | && inferior_ptid != null_ptid |
78267919 | 9222 | && gdbarch_get_siginfo_type_p (gdbarch)) |
4aa995e1 | 9223 | { |
78267919 | 9224 | struct type *type = gdbarch_get_siginfo_type (gdbarch); |
abbb1732 | 9225 | |
78267919 | 9226 | return allocate_computed_value (type, &siginfo_value_funcs, NULL); |
4aa995e1 PA |
9227 | } |
9228 | ||
78267919 | 9229 | return allocate_value (builtin_type (gdbarch)->builtin_void); |
4aa995e1 PA |
9230 | } |
9231 | ||
c906108c | 9232 | \f |
16c381f0 JK |
9233 | /* infcall_suspend_state contains state about the program itself like its |
9234 | registers and any signal it received when it last stopped. | |
9235 | This state must be restored regardless of how the inferior function call | |
9236 | ends (either successfully, or after it hits a breakpoint or signal) | |
9237 | if the program is to properly continue where it left off. */ | |
9238 | ||
6bf78e29 | 9239 | class infcall_suspend_state |
7a292a7a | 9240 | { |
6bf78e29 AB |
9241 | public: |
9242 | /* Capture state from GDBARCH, TP, and REGCACHE that must be restored | |
9243 | once the inferior function call has finished. */ | |
9244 | infcall_suspend_state (struct gdbarch *gdbarch, | |
dda83cd7 SM |
9245 | const struct thread_info *tp, |
9246 | struct regcache *regcache) | |
1edb66d8 | 9247 | : m_registers (new readonly_detached_regcache (*regcache)) |
6bf78e29 | 9248 | { |
1edb66d8 SM |
9249 | tp->save_suspend_to (m_thread_suspend); |
9250 | ||
6bf78e29 AB |
9251 | gdb::unique_xmalloc_ptr<gdb_byte> siginfo_data; |
9252 | ||
9253 | if (gdbarch_get_siginfo_type_p (gdbarch)) | |
9254 | { | |
dda83cd7 | 9255 | struct type *type = gdbarch_get_siginfo_type (gdbarch); |
df86565b | 9256 | size_t len = type->length (); |
6bf78e29 | 9257 | |
dda83cd7 | 9258 | siginfo_data.reset ((gdb_byte *) xmalloc (len)); |
6bf78e29 | 9259 | |
328d42d8 SM |
9260 | if (target_read (current_inferior ()->top_target (), |
9261 | TARGET_OBJECT_SIGNAL_INFO, NULL, | |
dda83cd7 SM |
9262 | siginfo_data.get (), 0, len) != len) |
9263 | { | |
9264 | /* Errors ignored. */ | |
9265 | siginfo_data.reset (nullptr); | |
9266 | } | |
6bf78e29 AB |
9267 | } |
9268 | ||
9269 | if (siginfo_data) | |
9270 | { | |
dda83cd7 SM |
9271 | m_siginfo_gdbarch = gdbarch; |
9272 | m_siginfo_data = std::move (siginfo_data); | |
6bf78e29 AB |
9273 | } |
9274 | } | |
9275 | ||
9276 | /* Return a pointer to the stored register state. */ | |
16c381f0 | 9277 | |
6bf78e29 AB |
9278 | readonly_detached_regcache *registers () const |
9279 | { | |
9280 | return m_registers.get (); | |
9281 | } | |
9282 | ||
9283 | /* Restores the stored state into GDBARCH, TP, and REGCACHE. */ | |
9284 | ||
9285 | void restore (struct gdbarch *gdbarch, | |
dda83cd7 SM |
9286 | struct thread_info *tp, |
9287 | struct regcache *regcache) const | |
6bf78e29 | 9288 | { |
1edb66d8 | 9289 | tp->restore_suspend_from (m_thread_suspend); |
6bf78e29 AB |
9290 | |
9291 | if (m_siginfo_gdbarch == gdbarch) | |
9292 | { | |
dda83cd7 | 9293 | struct type *type = gdbarch_get_siginfo_type (gdbarch); |
6bf78e29 | 9294 | |
dda83cd7 | 9295 | /* Errors ignored. */ |
328d42d8 SM |
9296 | target_write (current_inferior ()->top_target (), |
9297 | TARGET_OBJECT_SIGNAL_INFO, NULL, | |
df86565b | 9298 | m_siginfo_data.get (), 0, type->length ()); |
6bf78e29 AB |
9299 | } |
9300 | ||
9301 | /* The inferior can be gone if the user types "print exit(0)" | |
9302 | (and perhaps other times). */ | |
55f6301a | 9303 | if (target_has_execution ()) |
6bf78e29 AB |
9304 | /* NB: The register write goes through to the target. */ |
9305 | regcache->restore (registers ()); | |
9306 | } | |
9307 | ||
9308 | private: | |
9309 | /* How the current thread stopped before the inferior function call was | |
9310 | executed. */ | |
9311 | struct thread_suspend_state m_thread_suspend; | |
9312 | ||
9313 | /* The registers before the inferior function call was executed. */ | |
9314 | std::unique_ptr<readonly_detached_regcache> m_registers; | |
1736ad11 | 9315 | |
35515841 | 9316 | /* Format of SIGINFO_DATA or NULL if it is not present. */ |
6bf78e29 | 9317 | struct gdbarch *m_siginfo_gdbarch = nullptr; |
1736ad11 JK |
9318 | |
9319 | /* The inferior format depends on SIGINFO_GDBARCH and it has a length of | |
df86565b | 9320 | gdbarch_get_siginfo_type ()->length (). For different gdbarch the |
1736ad11 | 9321 | content would be invalid. */ |
6bf78e29 | 9322 | gdb::unique_xmalloc_ptr<gdb_byte> m_siginfo_data; |
b89667eb DE |
9323 | }; |
9324 | ||
cb524840 TT |
9325 | infcall_suspend_state_up |
9326 | save_infcall_suspend_state () | |
b89667eb | 9327 | { |
b89667eb | 9328 | struct thread_info *tp = inferior_thread (); |
1736ad11 | 9329 | struct regcache *regcache = get_current_regcache (); |
ac7936df | 9330 | struct gdbarch *gdbarch = regcache->arch (); |
1736ad11 | 9331 | |
6bf78e29 AB |
9332 | infcall_suspend_state_up inf_state |
9333 | (new struct infcall_suspend_state (gdbarch, tp, regcache)); | |
1736ad11 | 9334 | |
6bf78e29 AB |
9335 | /* Having saved the current state, adjust the thread state, discarding |
9336 | any stop signal information. The stop signal is not useful when | |
9337 | starting an inferior function call, and run_inferior_call will not use | |
9338 | the signal due to its `proceed' call with GDB_SIGNAL_0. */ | |
1edb66d8 | 9339 | tp->set_stop_signal (GDB_SIGNAL_0); |
35515841 | 9340 | |
b89667eb DE |
9341 | return inf_state; |
9342 | } | |
9343 | ||
9344 | /* Restore inferior session state to INF_STATE. */ | |
9345 | ||
9346 | void | |
16c381f0 | 9347 | restore_infcall_suspend_state (struct infcall_suspend_state *inf_state) |
b89667eb DE |
9348 | { |
9349 | struct thread_info *tp = inferior_thread (); | |
1736ad11 | 9350 | struct regcache *regcache = get_current_regcache (); |
ac7936df | 9351 | struct gdbarch *gdbarch = regcache->arch (); |
b89667eb | 9352 | |
6bf78e29 | 9353 | inf_state->restore (gdbarch, tp, regcache); |
16c381f0 | 9354 | discard_infcall_suspend_state (inf_state); |
b89667eb DE |
9355 | } |
9356 | ||
b89667eb | 9357 | void |
16c381f0 | 9358 | discard_infcall_suspend_state (struct infcall_suspend_state *inf_state) |
b89667eb | 9359 | { |
dd848631 | 9360 | delete inf_state; |
b89667eb DE |
9361 | } |
9362 | ||
daf6667d | 9363 | readonly_detached_regcache * |
16c381f0 | 9364 | get_infcall_suspend_state_regcache (struct infcall_suspend_state *inf_state) |
b89667eb | 9365 | { |
6bf78e29 | 9366 | return inf_state->registers (); |
b89667eb DE |
9367 | } |
9368 | ||
16c381f0 JK |
9369 | /* infcall_control_state contains state regarding gdb's control of the |
9370 | inferior itself like stepping control. It also contains session state like | |
9371 | the user's currently selected frame. */ | |
b89667eb | 9372 | |
16c381f0 | 9373 | struct infcall_control_state |
b89667eb | 9374 | { |
16c381f0 JK |
9375 | struct thread_control_state thread_control; |
9376 | struct inferior_control_state inferior_control; | |
d82142e2 JK |
9377 | |
9378 | /* Other fields: */ | |
ee841dd8 TT |
9379 | enum stop_stack_kind stop_stack_dummy = STOP_NONE; |
9380 | int stopped_by_random_signal = 0; | |
7a292a7a | 9381 | |
79952e69 PA |
9382 | /* ID and level of the selected frame when the inferior function |
9383 | call was made. */ | |
ee841dd8 | 9384 | struct frame_id selected_frame_id {}; |
79952e69 | 9385 | int selected_frame_level = -1; |
7a292a7a SS |
9386 | }; |
9387 | ||
c906108c | 9388 | /* Save all of the information associated with the inferior<==>gdb |
b89667eb | 9389 | connection. */ |
c906108c | 9390 | |
cb524840 TT |
9391 | infcall_control_state_up |
9392 | save_infcall_control_state () | |
c906108c | 9393 | { |
cb524840 | 9394 | infcall_control_state_up inf_status (new struct infcall_control_state); |
4e1c45ea | 9395 | struct thread_info *tp = inferior_thread (); |
d6b48e9c | 9396 | struct inferior *inf = current_inferior (); |
7a292a7a | 9397 | |
16c381f0 JK |
9398 | inf_status->thread_control = tp->control; |
9399 | inf_status->inferior_control = inf->control; | |
d82142e2 | 9400 | |
8358c15c | 9401 | tp->control.step_resume_breakpoint = NULL; |
5b79abe7 | 9402 | tp->control.exception_resume_breakpoint = NULL; |
8358c15c | 9403 | |
16c381f0 JK |
9404 | /* Save original bpstat chain to INF_STATUS; replace it in TP with copy of |
9405 | chain. If caller's caller is walking the chain, they'll be happier if we | |
9406 | hand them back the original chain when restore_infcall_control_state is | |
9407 | called. */ | |
9408 | tp->control.stop_bpstat = bpstat_copy (tp->control.stop_bpstat); | |
d82142e2 JK |
9409 | |
9410 | /* Other fields: */ | |
9411 | inf_status->stop_stack_dummy = stop_stack_dummy; | |
9412 | inf_status->stopped_by_random_signal = stopped_by_random_signal; | |
c5aa993b | 9413 | |
79952e69 PA |
9414 | save_selected_frame (&inf_status->selected_frame_id, |
9415 | &inf_status->selected_frame_level); | |
b89667eb | 9416 | |
7a292a7a | 9417 | return inf_status; |
c906108c SS |
9418 | } |
9419 | ||
b89667eb DE |
9420 | /* Restore inferior session state to INF_STATUS. */ |
9421 | ||
c906108c | 9422 | void |
16c381f0 | 9423 | restore_infcall_control_state (struct infcall_control_state *inf_status) |
c906108c | 9424 | { |
4e1c45ea | 9425 | struct thread_info *tp = inferior_thread (); |
d6b48e9c | 9426 | struct inferior *inf = current_inferior (); |
4e1c45ea | 9427 | |
8358c15c JK |
9428 | if (tp->control.step_resume_breakpoint) |
9429 | tp->control.step_resume_breakpoint->disposition = disp_del_at_next_stop; | |
9430 | ||
5b79abe7 TT |
9431 | if (tp->control.exception_resume_breakpoint) |
9432 | tp->control.exception_resume_breakpoint->disposition | |
9433 | = disp_del_at_next_stop; | |
9434 | ||
d82142e2 | 9435 | /* Handle the bpstat_copy of the chain. */ |
16c381f0 | 9436 | bpstat_clear (&tp->control.stop_bpstat); |
d82142e2 | 9437 | |
16c381f0 JK |
9438 | tp->control = inf_status->thread_control; |
9439 | inf->control = inf_status->inferior_control; | |
d82142e2 JK |
9440 | |
9441 | /* Other fields: */ | |
9442 | stop_stack_dummy = inf_status->stop_stack_dummy; | |
9443 | stopped_by_random_signal = inf_status->stopped_by_random_signal; | |
c906108c | 9444 | |
841de120 | 9445 | if (target_has_stack ()) |
c906108c | 9446 | { |
79952e69 PA |
9447 | restore_selected_frame (inf_status->selected_frame_id, |
9448 | inf_status->selected_frame_level); | |
c906108c | 9449 | } |
c906108c | 9450 | |
ee841dd8 | 9451 | delete inf_status; |
7a292a7a | 9452 | } |
c906108c SS |
9453 | |
9454 | void | |
16c381f0 | 9455 | discard_infcall_control_state (struct infcall_control_state *inf_status) |
7a292a7a | 9456 | { |
8358c15c JK |
9457 | if (inf_status->thread_control.step_resume_breakpoint) |
9458 | inf_status->thread_control.step_resume_breakpoint->disposition | |
9459 | = disp_del_at_next_stop; | |
9460 | ||
5b79abe7 TT |
9461 | if (inf_status->thread_control.exception_resume_breakpoint) |
9462 | inf_status->thread_control.exception_resume_breakpoint->disposition | |
9463 | = disp_del_at_next_stop; | |
9464 | ||
1777feb0 | 9465 | /* See save_infcall_control_state for info on stop_bpstat. */ |
16c381f0 | 9466 | bpstat_clear (&inf_status->thread_control.stop_bpstat); |
8358c15c | 9467 | |
ee841dd8 | 9468 | delete inf_status; |
7a292a7a | 9469 | } |
b89667eb | 9470 | \f |
7f89fd65 | 9471 | /* See infrun.h. */ |
0c557179 SDJ |
9472 | |
9473 | void | |
9474 | clear_exit_convenience_vars (void) | |
9475 | { | |
9476 | clear_internalvar (lookup_internalvar ("_exitsignal")); | |
9477 | clear_internalvar (lookup_internalvar ("_exitcode")); | |
9478 | } | |
c5aa993b | 9479 | \f |
488f131b | 9480 | |
b2175913 MS |
9481 | /* User interface for reverse debugging: |
9482 | Set exec-direction / show exec-direction commands | |
9483 | (returns error unless target implements to_set_exec_direction method). */ | |
9484 | ||
170742de | 9485 | enum exec_direction_kind execution_direction = EXEC_FORWARD; |
b2175913 MS |
9486 | static const char exec_forward[] = "forward"; |
9487 | static const char exec_reverse[] = "reverse"; | |
9488 | static const char *exec_direction = exec_forward; | |
40478521 | 9489 | static const char *const exec_direction_names[] = { |
b2175913 MS |
9490 | exec_forward, |
9491 | exec_reverse, | |
9492 | NULL | |
9493 | }; | |
9494 | ||
9495 | static void | |
eb4c3f4a | 9496 | set_exec_direction_func (const char *args, int from_tty, |
b2175913 MS |
9497 | struct cmd_list_element *cmd) |
9498 | { | |
05374cfd | 9499 | if (target_can_execute_reverse ()) |
b2175913 MS |
9500 | { |
9501 | if (!strcmp (exec_direction, exec_forward)) | |
9502 | execution_direction = EXEC_FORWARD; | |
9503 | else if (!strcmp (exec_direction, exec_reverse)) | |
9504 | execution_direction = EXEC_REVERSE; | |
9505 | } | |
8bbed405 MS |
9506 | else |
9507 | { | |
9508 | exec_direction = exec_forward; | |
9509 | error (_("Target does not support this operation.")); | |
9510 | } | |
b2175913 MS |
9511 | } |
9512 | ||
9513 | static void | |
9514 | show_exec_direction_func (struct ui_file *out, int from_tty, | |
9515 | struct cmd_list_element *cmd, const char *value) | |
9516 | { | |
9517 | switch (execution_direction) { | |
9518 | case EXEC_FORWARD: | |
6cb06a8c | 9519 | gdb_printf (out, _("Forward.\n")); |
b2175913 MS |
9520 | break; |
9521 | case EXEC_REVERSE: | |
6cb06a8c | 9522 | gdb_printf (out, _("Reverse.\n")); |
b2175913 | 9523 | break; |
b2175913 | 9524 | default: |
f34652de | 9525 | internal_error (_("bogus execution_direction value: %d"), |
d8b34453 | 9526 | (int) execution_direction); |
b2175913 MS |
9527 | } |
9528 | } | |
9529 | ||
d4db2f36 PA |
9530 | static void |
9531 | show_schedule_multiple (struct ui_file *file, int from_tty, | |
9532 | struct cmd_list_element *c, const char *value) | |
9533 | { | |
6cb06a8c TT |
9534 | gdb_printf (file, _("Resuming the execution of threads " |
9535 | "of all processes is %s.\n"), value); | |
d4db2f36 | 9536 | } |
ad52ddc6 | 9537 | |
22d2b532 SDJ |
9538 | /* Implementation of `siginfo' variable. */ |
9539 | ||
9540 | static const struct internalvar_funcs siginfo_funcs = | |
9541 | { | |
9542 | siginfo_make_value, | |
9543 | NULL, | |
22d2b532 SDJ |
9544 | }; |
9545 | ||
372316f1 PA |
9546 | /* Callback for infrun's target events source. This is marked when a |
9547 | thread has a pending status to process. */ | |
9548 | ||
9549 | static void | |
9550 | infrun_async_inferior_event_handler (gdb_client_data data) | |
9551 | { | |
6b36ddeb | 9552 | clear_async_event_handler (infrun_async_inferior_event_token); |
b1a35af2 | 9553 | inferior_event_handler (INF_REG_EVENT); |
372316f1 PA |
9554 | } |
9555 | ||
8087c3fa | 9556 | #if GDB_SELF_TEST |
b161a60d SM |
9557 | namespace selftests |
9558 | { | |
9559 | ||
9560 | /* Verify that when two threads with the same ptid exist (from two different | |
9561 | targets) and one of them changes ptid, we only update inferior_ptid if | |
9562 | it is appropriate. */ | |
9563 | ||
9564 | static void | |
9565 | infrun_thread_ptid_changed () | |
9566 | { | |
9567 | gdbarch *arch = current_inferior ()->gdbarch; | |
9568 | ||
9569 | /* The thread which inferior_ptid represents 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 (&target1.mock_inferior); | |
9591 | ||
9592 | thread_change_ptid (&target1.mock_target, old_ptid, new_ptid); | |
9593 | ||
9594 | gdb_assert (inferior_ptid == new_ptid); | |
9595 | } | |
9596 | ||
9597 | /* A thread with the same ptid as inferior_ptid, but from another target, | |
9598 | changes ptid. */ | |
9599 | { | |
9600 | scoped_restore_current_pspace_and_thread restore; | |
9601 | ||
9602 | scoped_mock_context<test_target_ops> target1 (arch); | |
9603 | scoped_mock_context<test_target_ops> target2 (arch); | |
b161a60d SM |
9604 | |
9605 | ptid_t old_ptid (111, 222); | |
9606 | ptid_t new_ptid (111, 333); | |
9607 | ||
9608 | target1.mock_inferior.pid = old_ptid.pid (); | |
9609 | target1.mock_thread.ptid = old_ptid; | |
922cc93d SM |
9610 | target1.mock_inferior.ptid_thread_map.clear (); |
9611 | target1.mock_inferior.ptid_thread_map[old_ptid] = &target1.mock_thread; | |
9612 | ||
b161a60d SM |
9613 | target2.mock_inferior.pid = old_ptid.pid (); |
9614 | target2.mock_thread.ptid = old_ptid; | |
922cc93d SM |
9615 | target2.mock_inferior.ptid_thread_map.clear (); |
9616 | target2.mock_inferior.ptid_thread_map[old_ptid] = &target2.mock_thread; | |
b161a60d SM |
9617 | |
9618 | auto restore_inferior_ptid = make_scoped_restore (&inferior_ptid, old_ptid); | |
9619 | set_current_inferior (&target2.mock_inferior); | |
9620 | ||
9621 | thread_change_ptid (&target1.mock_target, old_ptid, new_ptid); | |
9622 | ||
9623 | gdb_assert (inferior_ptid == old_ptid); | |
9624 | } | |
9625 | } | |
9626 | ||
9627 | } /* namespace selftests */ | |
9628 | ||
8087c3fa JB |
9629 | #endif /* GDB_SELF_TEST */ |
9630 | ||
6c265988 | 9631 | void _initialize_infrun (); |
c906108c | 9632 | void |
6c265988 | 9633 | _initialize_infrun () |
c906108c | 9634 | { |
de0bea00 | 9635 | struct cmd_list_element *c; |
c906108c | 9636 | |
372316f1 PA |
9637 | /* Register extra event sources in the event loop. */ |
9638 | infrun_async_inferior_event_token | |
db20ebdf SM |
9639 | = create_async_event_handler (infrun_async_inferior_event_handler, NULL, |
9640 | "infrun"); | |
372316f1 | 9641 | |
e0f25bd9 SM |
9642 | cmd_list_element *info_signals_cmd |
9643 | = add_info ("signals", info_signals_command, _("\ | |
1bedd215 AC |
9644 | What debugger does when program gets various signals.\n\ |
9645 | Specify a signal as argument to print info on that signal only.")); | |
e0f25bd9 | 9646 | add_info_alias ("handle", info_signals_cmd, 0); |
c906108c | 9647 | |
de0bea00 | 9648 | c = add_com ("handle", class_run, handle_command, _("\ |
dfbd5e7b | 9649 | Specify how to handle signals.\n\ |
486c7739 | 9650 | Usage: handle SIGNAL [ACTIONS]\n\ |
c906108c | 9651 | Args are signals and actions to apply to those signals.\n\ |
dfbd5e7b | 9652 | If no actions are specified, the current settings for the specified signals\n\ |
486c7739 MF |
9653 | will be displayed instead.\n\ |
9654 | \n\ | |
c906108c SS |
9655 | Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\ |
9656 | from 1-15 are allowed for compatibility with old versions of GDB.\n\ | |
9657 | Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\ | |
9658 | The special arg \"all\" is recognized to mean all signals except those\n\ | |
1bedd215 | 9659 | used by the debugger, typically SIGTRAP and SIGINT.\n\ |
486c7739 | 9660 | \n\ |
1bedd215 | 9661 | Recognized actions include \"stop\", \"nostop\", \"print\", \"noprint\",\n\ |
c906108c SS |
9662 | \"pass\", \"nopass\", \"ignore\", or \"noignore\".\n\ |
9663 | Stop means reenter debugger if this signal happens (implies print).\n\ | |
9664 | Print means print a message if this signal happens.\n\ | |
9665 | Pass means let program see this signal; otherwise program doesn't know.\n\ | |
9666 | Ignore is a synonym for nopass and noignore is a synonym for pass.\n\ | |
dfbd5e7b PA |
9667 | Pass and Stop may be combined.\n\ |
9668 | \n\ | |
9669 | Multiple signals may be specified. Signal numbers and signal names\n\ | |
9670 | may be interspersed with actions, with the actions being performed for\n\ | |
9671 | all signals cumulatively specified.")); | |
de0bea00 | 9672 | set_cmd_completer (c, handle_completer); |
486c7739 | 9673 | |
49a82d50 TT |
9674 | stop_command = add_cmd ("stop", class_obscure, |
9675 | not_just_help_class_command, _("\ | |
1a966eab | 9676 | There is no `stop' command, but you can set a hook on `stop'.\n\ |
c906108c | 9677 | This allows you to set a list of commands to be run each time execution\n\ |
1a966eab | 9678 | of the program stops."), &cmdlist); |
c906108c | 9679 | |
94ba44a6 SM |
9680 | add_setshow_boolean_cmd |
9681 | ("infrun", class_maintenance, &debug_infrun, | |
9682 | _("Set inferior debugging."), | |
9683 | _("Show inferior debugging."), | |
9684 | _("When non-zero, inferior specific debugging is enabled."), | |
9685 | NULL, show_debug_infrun, &setdebuglist, &showdebuglist); | |
527159b7 | 9686 | |
ad52ddc6 PA |
9687 | add_setshow_boolean_cmd ("non-stop", no_class, |
9688 | &non_stop_1, _("\ | |
9689 | Set whether gdb controls the inferior in non-stop mode."), _("\ | |
9690 | Show whether gdb controls the inferior in non-stop mode."), _("\ | |
9691 | When debugging a multi-threaded program and this setting is\n\ | |
9692 | off (the default, also called all-stop mode), when one thread stops\n\ | |
9693 | (for a breakpoint, watchpoint, exception, or similar events), GDB stops\n\ | |
9694 | all other threads in the program while you interact with the thread of\n\ | |
9695 | interest. When you continue or step a thread, you can allow the other\n\ | |
9696 | threads to run, or have them remain stopped, but while you inspect any\n\ | |
9697 | thread's state, all threads stop.\n\ | |
9698 | \n\ | |
9699 | In non-stop mode, when one thread stops, other threads can continue\n\ | |
9700 | to run freely. You'll be able to step each thread independently,\n\ | |
9701 | leave it stopped or free to run as needed."), | |
9702 | set_non_stop, | |
9703 | show_non_stop, | |
9704 | &setlist, | |
9705 | &showlist); | |
9706 | ||
adc6a863 | 9707 | for (size_t i = 0; i < GDB_SIGNAL_LAST; i++) |
c906108c SS |
9708 | { |
9709 | signal_stop[i] = 1; | |
9710 | signal_print[i] = 1; | |
9711 | signal_program[i] = 1; | |
ab04a2af | 9712 | signal_catch[i] = 0; |
c906108c SS |
9713 | } |
9714 | ||
4d9d9d04 PA |
9715 | /* Signals caused by debugger's own actions should not be given to |
9716 | the program afterwards. | |
9717 | ||
9718 | Do not deliver GDB_SIGNAL_TRAP by default, except when the user | |
9719 | explicitly specifies that it should be delivered to the target | |
9720 | program. Typically, that would occur when a user is debugging a | |
9721 | target monitor on a simulator: the target monitor sets a | |
9722 | breakpoint; the simulator encounters this breakpoint and halts | |
9723 | the simulation handing control to GDB; GDB, noting that the stop | |
9724 | address doesn't map to any known breakpoint, returns control back | |
9725 | to the simulator; the simulator then delivers the hardware | |
9726 | equivalent of a GDB_SIGNAL_TRAP to the program being | |
9727 | debugged. */ | |
a493e3e2 PA |
9728 | signal_program[GDB_SIGNAL_TRAP] = 0; |
9729 | signal_program[GDB_SIGNAL_INT] = 0; | |
c906108c SS |
9730 | |
9731 | /* Signals that are not errors should not normally enter the debugger. */ | |
a493e3e2 PA |
9732 | signal_stop[GDB_SIGNAL_ALRM] = 0; |
9733 | signal_print[GDB_SIGNAL_ALRM] = 0; | |
9734 | signal_stop[GDB_SIGNAL_VTALRM] = 0; | |
9735 | signal_print[GDB_SIGNAL_VTALRM] = 0; | |
9736 | signal_stop[GDB_SIGNAL_PROF] = 0; | |
9737 | signal_print[GDB_SIGNAL_PROF] = 0; | |
9738 | signal_stop[GDB_SIGNAL_CHLD] = 0; | |
9739 | signal_print[GDB_SIGNAL_CHLD] = 0; | |
9740 | signal_stop[GDB_SIGNAL_IO] = 0; | |
9741 | signal_print[GDB_SIGNAL_IO] = 0; | |
9742 | signal_stop[GDB_SIGNAL_POLL] = 0; | |
9743 | signal_print[GDB_SIGNAL_POLL] = 0; | |
9744 | signal_stop[GDB_SIGNAL_URG] = 0; | |
9745 | signal_print[GDB_SIGNAL_URG] = 0; | |
9746 | signal_stop[GDB_SIGNAL_WINCH] = 0; | |
9747 | signal_print[GDB_SIGNAL_WINCH] = 0; | |
9748 | signal_stop[GDB_SIGNAL_PRIO] = 0; | |
9749 | signal_print[GDB_SIGNAL_PRIO] = 0; | |
c906108c | 9750 | |
cd0fc7c3 SS |
9751 | /* These signals are used internally by user-level thread |
9752 | implementations. (See signal(5) on Solaris.) Like the above | |
9753 | signals, a healthy program receives and handles them as part of | |
9754 | its normal operation. */ | |
a493e3e2 PA |
9755 | signal_stop[GDB_SIGNAL_LWP] = 0; |
9756 | signal_print[GDB_SIGNAL_LWP] = 0; | |
9757 | signal_stop[GDB_SIGNAL_WAITING] = 0; | |
9758 | signal_print[GDB_SIGNAL_WAITING] = 0; | |
9759 | signal_stop[GDB_SIGNAL_CANCEL] = 0; | |
9760 | signal_print[GDB_SIGNAL_CANCEL] = 0; | |
bc7b765a JB |
9761 | signal_stop[GDB_SIGNAL_LIBRT] = 0; |
9762 | signal_print[GDB_SIGNAL_LIBRT] = 0; | |
cd0fc7c3 | 9763 | |
2455069d UW |
9764 | /* Update cached state. */ |
9765 | signal_cache_update (-1); | |
9766 | ||
85c07804 AC |
9767 | add_setshow_zinteger_cmd ("stop-on-solib-events", class_support, |
9768 | &stop_on_solib_events, _("\ | |
9769 | Set stopping for shared library events."), _("\ | |
9770 | Show stopping for shared library events."), _("\ | |
c906108c SS |
9771 | If nonzero, gdb will give control to the user when the dynamic linker\n\ |
9772 | notifies gdb of shared library events. The most common event of interest\n\ | |
85c07804 | 9773 | to the user would be loading/unloading of a new library."), |
f9e14852 | 9774 | set_stop_on_solib_events, |
920d2a44 | 9775 | show_stop_on_solib_events, |
85c07804 | 9776 | &setlist, &showlist); |
c906108c | 9777 | |
7ab04401 AC |
9778 | add_setshow_enum_cmd ("follow-fork-mode", class_run, |
9779 | follow_fork_mode_kind_names, | |
9780 | &follow_fork_mode_string, _("\ | |
9781 | Set debugger response to a program call of fork or vfork."), _("\ | |
9782 | Show debugger response to a program call of fork or vfork."), _("\ | |
c906108c SS |
9783 | A fork or vfork creates a new process. follow-fork-mode can be:\n\ |
9784 | parent - the original process is debugged after a fork\n\ | |
9785 | child - the new process is debugged after a fork\n\ | |
ea1dd7bc | 9786 | The unfollowed process will continue to run.\n\ |
7ab04401 AC |
9787 | By default, the debugger will follow the parent process."), |
9788 | NULL, | |
920d2a44 | 9789 | show_follow_fork_mode_string, |
7ab04401 AC |
9790 | &setlist, &showlist); |
9791 | ||
6c95b8df PA |
9792 | add_setshow_enum_cmd ("follow-exec-mode", class_run, |
9793 | follow_exec_mode_names, | |
9794 | &follow_exec_mode_string, _("\ | |
9795 | Set debugger response to a program call of exec."), _("\ | |
9796 | Show debugger response to a program call of exec."), _("\ | |
9797 | An exec call replaces the program image of a process.\n\ | |
9798 | \n\ | |
9799 | follow-exec-mode can be:\n\ | |
9800 | \n\ | |
cce7e648 | 9801 | new - the debugger creates a new inferior and rebinds the process\n\ |
6c95b8df PA |
9802 | to this new inferior. The program the process was running before\n\ |
9803 | the exec call can be restarted afterwards by restarting the original\n\ | |
9804 | inferior.\n\ | |
9805 | \n\ | |
9806 | same - the debugger keeps the process bound to the same inferior.\n\ | |
9807 | The new executable image replaces the previous executable loaded in\n\ | |
9808 | the inferior. Restarting the inferior after the exec call restarts\n\ | |
9809 | the executable the process was running after the exec call.\n\ | |
9810 | \n\ | |
9811 | By default, the debugger will use the same inferior."), | |
9812 | NULL, | |
9813 | show_follow_exec_mode_string, | |
9814 | &setlist, &showlist); | |
9815 | ||
7ab04401 AC |
9816 | add_setshow_enum_cmd ("scheduler-locking", class_run, |
9817 | scheduler_enums, &scheduler_mode, _("\ | |
9818 | Set mode for locking scheduler during execution."), _("\ | |
9819 | Show mode for locking scheduler during execution."), _("\ | |
f2665db5 MM |
9820 | off == no locking (threads may preempt at any time)\n\ |
9821 | on == full locking (no thread except the current thread may run)\n\ | |
dda83cd7 | 9822 | This applies to both normal execution and replay mode.\n\ |
f2665db5 | 9823 | step == scheduler locked during stepping commands (step, next, stepi, nexti).\n\ |
dda83cd7 SM |
9824 | In this mode, other threads may run during other commands.\n\ |
9825 | This applies to both normal execution and replay mode.\n\ | |
f2665db5 | 9826 | replay == scheduler locked in replay mode and unlocked during normal execution."), |
7ab04401 | 9827 | set_schedlock_func, /* traps on target vector */ |
920d2a44 | 9828 | show_scheduler_mode, |
7ab04401 | 9829 | &setlist, &showlist); |
5fbbeb29 | 9830 | |
d4db2f36 PA |
9831 | add_setshow_boolean_cmd ("schedule-multiple", class_run, &sched_multi, _("\ |
9832 | Set mode for resuming threads of all processes."), _("\ | |
9833 | Show mode for resuming threads of all processes."), _("\ | |
9834 | When on, execution commands (such as 'continue' or 'next') resume all\n\ | |
9835 | threads of all processes. When off (which is the default), execution\n\ | |
9836 | commands only resume the threads of the current process. The set of\n\ | |
9837 | threads that are resumed is further refined by the scheduler-locking\n\ | |
9838 | mode (see help set scheduler-locking)."), | |
9839 | NULL, | |
9840 | show_schedule_multiple, | |
9841 | &setlist, &showlist); | |
9842 | ||
5bf193a2 AC |
9843 | add_setshow_boolean_cmd ("step-mode", class_run, &step_stop_if_no_debug, _("\ |
9844 | Set mode of the step operation."), _("\ | |
9845 | Show mode of the step operation."), _("\ | |
9846 | When set, doing a step over a function without debug line information\n\ | |
9847 | will stop at the first instruction of that function. Otherwise, the\n\ | |
9848 | function is skipped and the step command stops at a different source line."), | |
9849 | NULL, | |
920d2a44 | 9850 | show_step_stop_if_no_debug, |
5bf193a2 | 9851 | &setlist, &showlist); |
ca6724c1 | 9852 | |
72d0e2c5 YQ |
9853 | add_setshow_auto_boolean_cmd ("displaced-stepping", class_run, |
9854 | &can_use_displaced_stepping, _("\ | |
237fc4c9 PA |
9855 | Set debugger's willingness to use displaced stepping."), _("\ |
9856 | Show debugger's willingness to use displaced stepping."), _("\ | |
fff08868 HZ |
9857 | If on, gdb will use displaced stepping to step over breakpoints if it is\n\ |
9858 | supported by the target architecture. If off, gdb will not use displaced\n\ | |
9859 | stepping to step over breakpoints, even if such is supported by the target\n\ | |
9860 | architecture. If auto (which is the default), gdb will use displaced stepping\n\ | |
9861 | if the target architecture supports it and non-stop mode is active, but will not\n\ | |
9862 | use it in all-stop mode (see help set non-stop)."), | |
72d0e2c5 YQ |
9863 | NULL, |
9864 | show_can_use_displaced_stepping, | |
9865 | &setlist, &showlist); | |
237fc4c9 | 9866 | |
b2175913 MS |
9867 | add_setshow_enum_cmd ("exec-direction", class_run, exec_direction_names, |
9868 | &exec_direction, _("Set direction of execution.\n\ | |
9869 | Options are 'forward' or 'reverse'."), | |
9870 | _("Show direction of execution (forward/reverse)."), | |
9871 | _("Tells gdb whether to execute forward or backward."), | |
9872 | set_exec_direction_func, show_exec_direction_func, | |
9873 | &setlist, &showlist); | |
9874 | ||
6c95b8df PA |
9875 | /* Set/show detach-on-fork: user-settable mode. */ |
9876 | ||
9877 | add_setshow_boolean_cmd ("detach-on-fork", class_run, &detach_fork, _("\ | |
9878 | Set whether gdb will detach the child of a fork."), _("\ | |
9879 | Show whether gdb will detach the child of a fork."), _("\ | |
9880 | Tells gdb whether to detach the child of a fork."), | |
9881 | NULL, NULL, &setlist, &showlist); | |
9882 | ||
03583c20 UW |
9883 | /* Set/show disable address space randomization mode. */ |
9884 | ||
9885 | add_setshow_boolean_cmd ("disable-randomization", class_support, | |
9886 | &disable_randomization, _("\ | |
9887 | Set disabling of debuggee's virtual address space randomization."), _("\ | |
9888 | Show disabling of debuggee's virtual address space randomization."), _("\ | |
9889 | When this mode is on (which is the default), randomization of the virtual\n\ | |
9890 | address space is disabled. Standalone programs run with the randomization\n\ | |
9891 | enabled by default on some platforms."), | |
9892 | &set_disable_randomization, | |
9893 | &show_disable_randomization, | |
9894 | &setlist, &showlist); | |
9895 | ||
ca6724c1 | 9896 | /* ptid initializations */ |
ca6724c1 KB |
9897 | inferior_ptid = null_ptid; |
9898 | target_last_wait_ptid = minus_one_ptid; | |
5231c1fd | 9899 | |
c90e7d63 SM |
9900 | gdb::observers::thread_ptid_changed.attach (infrun_thread_ptid_changed, |
9901 | "infrun"); | |
9902 | gdb::observers::thread_stop_requested.attach (infrun_thread_stop_requested, | |
9903 | "infrun"); | |
9904 | gdb::observers::thread_exit.attach (infrun_thread_thread_exit, "infrun"); | |
9905 | gdb::observers::inferior_exit.attach (infrun_inferior_exit, "infrun"); | |
9906 | gdb::observers::inferior_execd.attach (infrun_inferior_execd, "infrun"); | |
4aa995e1 PA |
9907 | |
9908 | /* Explicitly create without lookup, since that tries to create a | |
9909 | value with a void typed value, and when we get here, gdbarch | |
9910 | isn't initialized yet. At this point, we're quite sure there | |
9911 | isn't another convenience variable of the same name. */ | |
22d2b532 | 9912 | create_internalvar_type_lazy ("_siginfo", &siginfo_funcs, NULL); |
d914c394 SS |
9913 | |
9914 | add_setshow_boolean_cmd ("observer", no_class, | |
9915 | &observer_mode_1, _("\ | |
9916 | Set whether gdb controls the inferior in observer mode."), _("\ | |
9917 | Show whether gdb controls the inferior in observer mode."), _("\ | |
9918 | In observer mode, GDB can get data from the inferior, but not\n\ | |
9919 | affect its execution. Registers and memory may not be changed,\n\ | |
9920 | breakpoints may not be set, and the program cannot be interrupted\n\ | |
9921 | or signalled."), | |
9922 | set_observer_mode, | |
9923 | show_observer_mode, | |
9924 | &setlist, | |
9925 | &showlist); | |
b161a60d SM |
9926 | |
9927 | #if GDB_SELF_TEST | |
9928 | selftests::register_test ("infrun_thread_ptid_changed", | |
9929 | selftests::infrun_thread_ptid_changed); | |
9930 | #endif | |
c906108c | 9931 | } |