Commit | Line | Data |
---|---|---|
ca557f44 AC |
1 | /* Target-struct-independent code to start (run) and stop an inferior |
2 | process. | |
8926118c | 3 | |
42a4f53d | 4 | Copyright (C) 1986-2019 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" | |
45741a9c | 22 | #include "infrun.h" |
c906108c SS |
23 | #include <ctype.h> |
24 | #include "symtab.h" | |
25 | #include "frame.h" | |
26 | #include "inferior.h" | |
27 | #include "breakpoint.h" | |
0747795c | 28 | #include "common/gdb_wait.h" |
c906108c SS |
29 | #include "gdbcore.h" |
30 | #include "gdbcmd.h" | |
210661e7 | 31 | #include "cli/cli-script.h" |
c906108c SS |
32 | #include "target.h" |
33 | #include "gdbthread.h" | |
34 | #include "annotate.h" | |
1adeb98a | 35 | #include "symfile.h" |
7a292a7a | 36 | #include "top.h" |
c906108c | 37 | #include <signal.h> |
2acceee2 | 38 | #include "inf-loop.h" |
4e052eda | 39 | #include "regcache.h" |
fd0407d6 | 40 | #include "value.h" |
76727919 | 41 | #include "observable.h" |
f636b87d | 42 | #include "language.h" |
a77053c2 | 43 | #include "solib.h" |
f17517ea | 44 | #include "main.h" |
186c406b TT |
45 | #include "dictionary.h" |
46 | #include "block.h" | |
034dad6f | 47 | #include "mi/mi-common.h" |
4f8d22e3 | 48 | #include "event-top.h" |
96429cc8 | 49 | #include "record.h" |
d02ed0bb | 50 | #include "record-full.h" |
edb3359d | 51 | #include "inline-frame.h" |
4efc6507 | 52 | #include "jit.h" |
06cd862c | 53 | #include "tracepoint.h" |
be34f849 | 54 | #include "continuations.h" |
b4a14fd0 | 55 | #include "interps.h" |
1bfeeb0f | 56 | #include "skip.h" |
28106bc2 SDJ |
57 | #include "probe.h" |
58 | #include "objfiles.h" | |
de0bea00 | 59 | #include "completer.h" |
9107fc8d | 60 | #include "target-descriptions.h" |
f15cb84a | 61 | #include "target-dcache.h" |
d83ad864 | 62 | #include "terminal.h" |
ff862be4 | 63 | #include "solist.h" |
372316f1 | 64 | #include "event-loop.h" |
243a9253 | 65 | #include "thread-fsm.h" |
8d297bbf | 66 | #include "common/enum-flags.h" |
5ed8105e PA |
67 | #include "progspace-and-thread.h" |
68 | #include "common/gdb_optional.h" | |
46a62268 | 69 | #include "arch-utils.h" |
4c41382a | 70 | #include "common/scope-exit.h" |
9799571e | 71 | #include "common/forward-scope-exit.h" |
c906108c SS |
72 | |
73 | /* Prototypes for local functions */ | |
74 | ||
2ea28649 | 75 | static void sig_print_info (enum gdb_signal); |
c906108c | 76 | |
96baa820 | 77 | static void sig_print_header (void); |
c906108c | 78 | |
4ef3f3be | 79 | static int follow_fork (void); |
96baa820 | 80 | |
d83ad864 DB |
81 | static int follow_fork_inferior (int follow_child, int detach_fork); |
82 | ||
83 | static void follow_inferior_reset_breakpoints (void); | |
84 | ||
a289b8f6 JK |
85 | static int currently_stepping (struct thread_info *tp); |
86 | ||
e58b0e63 PA |
87 | void nullify_last_target_wait_ptid (void); |
88 | ||
2c03e5be | 89 | static void insert_hp_step_resume_breakpoint_at_frame (struct frame_info *); |
2484c66b UW |
90 | |
91 | static void insert_step_resume_breakpoint_at_caller (struct frame_info *); | |
92 | ||
2484c66b UW |
93 | static void insert_longjmp_resume_breakpoint (struct gdbarch *, CORE_ADDR); |
94 | ||
8550d3b3 YQ |
95 | static int maybe_software_singlestep (struct gdbarch *gdbarch, CORE_ADDR pc); |
96 | ||
aff4e175 AB |
97 | static void resume (gdb_signal sig); |
98 | ||
372316f1 PA |
99 | /* Asynchronous signal handler registered as event loop source for |
100 | when we have pending events ready to be passed to the core. */ | |
101 | static struct async_event_handler *infrun_async_inferior_event_token; | |
102 | ||
103 | /* Stores whether infrun_async was previously enabled or disabled. | |
104 | Starts off as -1, indicating "never enabled/disabled". */ | |
105 | static int infrun_is_async = -1; | |
106 | ||
107 | /* See infrun.h. */ | |
108 | ||
109 | void | |
110 | infrun_async (int enable) | |
111 | { | |
112 | if (infrun_is_async != enable) | |
113 | { | |
114 | infrun_is_async = enable; | |
115 | ||
116 | if (debug_infrun) | |
117 | fprintf_unfiltered (gdb_stdlog, | |
118 | "infrun: infrun_async(%d)\n", | |
119 | enable); | |
120 | ||
121 | if (enable) | |
122 | mark_async_event_handler (infrun_async_inferior_event_token); | |
123 | else | |
124 | clear_async_event_handler (infrun_async_inferior_event_token); | |
125 | } | |
126 | } | |
127 | ||
0b333c5e PA |
128 | /* See infrun.h. */ |
129 | ||
130 | void | |
131 | mark_infrun_async_event_handler (void) | |
132 | { | |
133 | mark_async_event_handler (infrun_async_inferior_event_token); | |
134 | } | |
135 | ||
5fbbeb29 CF |
136 | /* When set, stop the 'step' command if we enter a function which has |
137 | no line number information. The normal behavior is that we step | |
138 | over such function. */ | |
139 | int step_stop_if_no_debug = 0; | |
920d2a44 AC |
140 | static void |
141 | show_step_stop_if_no_debug (struct ui_file *file, int from_tty, | |
142 | struct cmd_list_element *c, const char *value) | |
143 | { | |
144 | fprintf_filtered (file, _("Mode of the step operation is %s.\n"), value); | |
145 | } | |
5fbbeb29 | 146 | |
b9f437de PA |
147 | /* proceed and normal_stop use this to notify the user when the |
148 | inferior stopped in a different thread than it had been running | |
149 | in. */ | |
96baa820 | 150 | |
39f77062 | 151 | static ptid_t previous_inferior_ptid; |
7a292a7a | 152 | |
07107ca6 LM |
153 | /* If set (default for legacy reasons), when following a fork, GDB |
154 | will detach from one of the fork branches, child or parent. | |
155 | Exactly which branch is detached depends on 'set follow-fork-mode' | |
156 | setting. */ | |
157 | ||
158 | static int detach_fork = 1; | |
6c95b8df | 159 | |
237fc4c9 PA |
160 | int debug_displaced = 0; |
161 | static void | |
162 | show_debug_displaced (struct ui_file *file, int from_tty, | |
163 | struct cmd_list_element *c, const char *value) | |
164 | { | |
165 | fprintf_filtered (file, _("Displace stepping debugging is %s.\n"), value); | |
166 | } | |
167 | ||
ccce17b0 | 168 | unsigned int debug_infrun = 0; |
920d2a44 AC |
169 | static void |
170 | show_debug_infrun (struct ui_file *file, int from_tty, | |
171 | struct cmd_list_element *c, const char *value) | |
172 | { | |
173 | fprintf_filtered (file, _("Inferior debugging is %s.\n"), value); | |
174 | } | |
527159b7 | 175 | |
03583c20 UW |
176 | |
177 | /* Support for disabling address space randomization. */ | |
178 | ||
179 | int disable_randomization = 1; | |
180 | ||
181 | static void | |
182 | show_disable_randomization (struct ui_file *file, int from_tty, | |
183 | struct cmd_list_element *c, const char *value) | |
184 | { | |
185 | if (target_supports_disable_randomization ()) | |
186 | fprintf_filtered (file, | |
187 | _("Disabling randomization of debuggee's " | |
188 | "virtual address space is %s.\n"), | |
189 | value); | |
190 | else | |
191 | fputs_filtered (_("Disabling randomization of debuggee's " | |
192 | "virtual address space is unsupported on\n" | |
193 | "this platform.\n"), file); | |
194 | } | |
195 | ||
196 | static void | |
eb4c3f4a | 197 | set_disable_randomization (const char *args, int from_tty, |
03583c20 UW |
198 | struct cmd_list_element *c) |
199 | { | |
200 | if (!target_supports_disable_randomization ()) | |
201 | error (_("Disabling randomization of debuggee's " | |
202 | "virtual address space is unsupported on\n" | |
203 | "this platform.")); | |
204 | } | |
205 | ||
d32dc48e PA |
206 | /* User interface for non-stop mode. */ |
207 | ||
208 | int non_stop = 0; | |
209 | static int non_stop_1 = 0; | |
210 | ||
211 | static void | |
eb4c3f4a | 212 | set_non_stop (const char *args, int from_tty, |
d32dc48e PA |
213 | struct cmd_list_element *c) |
214 | { | |
215 | if (target_has_execution) | |
216 | { | |
217 | non_stop_1 = non_stop; | |
218 | error (_("Cannot change this setting while the inferior is running.")); | |
219 | } | |
220 | ||
221 | non_stop = non_stop_1; | |
222 | } | |
223 | ||
224 | static void | |
225 | show_non_stop (struct ui_file *file, int from_tty, | |
226 | struct cmd_list_element *c, const char *value) | |
227 | { | |
228 | fprintf_filtered (file, | |
229 | _("Controlling the inferior in non-stop mode is %s.\n"), | |
230 | value); | |
231 | } | |
232 | ||
d914c394 SS |
233 | /* "Observer mode" is somewhat like a more extreme version of |
234 | non-stop, in which all GDB operations that might affect the | |
235 | target's execution have been disabled. */ | |
236 | ||
d914c394 SS |
237 | int observer_mode = 0; |
238 | static int observer_mode_1 = 0; | |
239 | ||
240 | static void | |
eb4c3f4a | 241 | set_observer_mode (const char *args, int from_tty, |
d914c394 SS |
242 | struct cmd_list_element *c) |
243 | { | |
d914c394 SS |
244 | if (target_has_execution) |
245 | { | |
246 | observer_mode_1 = observer_mode; | |
247 | error (_("Cannot change this setting while the inferior is running.")); | |
248 | } | |
249 | ||
250 | observer_mode = observer_mode_1; | |
251 | ||
252 | may_write_registers = !observer_mode; | |
253 | may_write_memory = !observer_mode; | |
254 | may_insert_breakpoints = !observer_mode; | |
255 | may_insert_tracepoints = !observer_mode; | |
256 | /* We can insert fast tracepoints in or out of observer mode, | |
257 | but enable them if we're going into this mode. */ | |
258 | if (observer_mode) | |
259 | may_insert_fast_tracepoints = 1; | |
260 | may_stop = !observer_mode; | |
261 | update_target_permissions (); | |
262 | ||
263 | /* Going *into* observer mode we must force non-stop, then | |
264 | going out we leave it that way. */ | |
265 | if (observer_mode) | |
266 | { | |
d914c394 SS |
267 | pagination_enabled = 0; |
268 | non_stop = non_stop_1 = 1; | |
269 | } | |
270 | ||
271 | if (from_tty) | |
272 | printf_filtered (_("Observer mode is now %s.\n"), | |
273 | (observer_mode ? "on" : "off")); | |
274 | } | |
275 | ||
276 | static void | |
277 | show_observer_mode (struct ui_file *file, int from_tty, | |
278 | struct cmd_list_element *c, const char *value) | |
279 | { | |
280 | fprintf_filtered (file, _("Observer mode is %s.\n"), value); | |
281 | } | |
282 | ||
283 | /* This updates the value of observer mode based on changes in | |
284 | permissions. Note that we are deliberately ignoring the values of | |
285 | may-write-registers and may-write-memory, since the user may have | |
286 | reason to enable these during a session, for instance to turn on a | |
287 | debugging-related global. */ | |
288 | ||
289 | void | |
290 | update_observer_mode (void) | |
291 | { | |
292 | int newval; | |
293 | ||
294 | newval = (!may_insert_breakpoints | |
295 | && !may_insert_tracepoints | |
296 | && may_insert_fast_tracepoints | |
297 | && !may_stop | |
298 | && non_stop); | |
299 | ||
300 | /* Let the user know if things change. */ | |
301 | if (newval != observer_mode) | |
302 | printf_filtered (_("Observer mode is now %s.\n"), | |
303 | (newval ? "on" : "off")); | |
304 | ||
305 | observer_mode = observer_mode_1 = newval; | |
306 | } | |
c2c6d25f | 307 | |
c906108c SS |
308 | /* Tables of how to react to signals; the user sets them. */ |
309 | ||
adc6a863 PA |
310 | static unsigned char signal_stop[GDB_SIGNAL_LAST]; |
311 | static unsigned char signal_print[GDB_SIGNAL_LAST]; | |
312 | static unsigned char signal_program[GDB_SIGNAL_LAST]; | |
c906108c | 313 | |
ab04a2af TT |
314 | /* Table of signals that are registered with "catch signal". A |
315 | non-zero entry indicates that the signal is caught by some "catch | |
adc6a863 PA |
316 | signal" command. */ |
317 | static unsigned char signal_catch[GDB_SIGNAL_LAST]; | |
ab04a2af | 318 | |
2455069d UW |
319 | /* Table of signals that the target may silently handle. |
320 | This is automatically determined from the flags above, | |
321 | and simply cached here. */ | |
adc6a863 | 322 | static unsigned char signal_pass[GDB_SIGNAL_LAST]; |
2455069d | 323 | |
c906108c SS |
324 | #define SET_SIGS(nsigs,sigs,flags) \ |
325 | do { \ | |
326 | int signum = (nsigs); \ | |
327 | while (signum-- > 0) \ | |
328 | if ((sigs)[signum]) \ | |
329 | (flags)[signum] = 1; \ | |
330 | } while (0) | |
331 | ||
332 | #define UNSET_SIGS(nsigs,sigs,flags) \ | |
333 | do { \ | |
334 | int signum = (nsigs); \ | |
335 | while (signum-- > 0) \ | |
336 | if ((sigs)[signum]) \ | |
337 | (flags)[signum] = 0; \ | |
338 | } while (0) | |
339 | ||
9b224c5e PA |
340 | /* Update the target's copy of SIGNAL_PROGRAM. The sole purpose of |
341 | this function is to avoid exporting `signal_program'. */ | |
342 | ||
343 | void | |
344 | update_signals_program_target (void) | |
345 | { | |
adc6a863 | 346 | target_program_signals (signal_program); |
9b224c5e PA |
347 | } |
348 | ||
1777feb0 | 349 | /* Value to pass to target_resume() to cause all threads to resume. */ |
39f77062 | 350 | |
edb3359d | 351 | #define RESUME_ALL minus_one_ptid |
c906108c SS |
352 | |
353 | /* Command list pointer for the "stop" placeholder. */ | |
354 | ||
355 | static struct cmd_list_element *stop_command; | |
356 | ||
c906108c SS |
357 | /* Nonzero if we want to give control to the user when we're notified |
358 | of shared library events by the dynamic linker. */ | |
628fe4e4 | 359 | int stop_on_solib_events; |
f9e14852 GB |
360 | |
361 | /* Enable or disable optional shared library event breakpoints | |
362 | as appropriate when the above flag is changed. */ | |
363 | ||
364 | static void | |
eb4c3f4a TT |
365 | set_stop_on_solib_events (const char *args, |
366 | int from_tty, struct cmd_list_element *c) | |
f9e14852 GB |
367 | { |
368 | update_solib_breakpoints (); | |
369 | } | |
370 | ||
920d2a44 AC |
371 | static void |
372 | show_stop_on_solib_events (struct ui_file *file, int from_tty, | |
373 | struct cmd_list_element *c, const char *value) | |
374 | { | |
375 | fprintf_filtered (file, _("Stopping for shared library events is %s.\n"), | |
376 | value); | |
377 | } | |
c906108c | 378 | |
c906108c SS |
379 | /* Nonzero after stop if current stack frame should be printed. */ |
380 | ||
381 | static int stop_print_frame; | |
382 | ||
e02bc4cc | 383 | /* This is a cached copy of the pid/waitstatus of the last event |
9a4105ab AC |
384 | returned by target_wait()/deprecated_target_wait_hook(). This |
385 | information is returned by get_last_target_status(). */ | |
39f77062 | 386 | static ptid_t target_last_wait_ptid; |
e02bc4cc DS |
387 | static struct target_waitstatus target_last_waitstatus; |
388 | ||
4e1c45ea | 389 | void init_thread_stepping_state (struct thread_info *tss); |
0d1e5fa7 | 390 | |
53904c9e AC |
391 | static const char follow_fork_mode_child[] = "child"; |
392 | static const char follow_fork_mode_parent[] = "parent"; | |
393 | ||
40478521 | 394 | static const char *const follow_fork_mode_kind_names[] = { |
53904c9e AC |
395 | follow_fork_mode_child, |
396 | follow_fork_mode_parent, | |
397 | NULL | |
ef346e04 | 398 | }; |
c906108c | 399 | |
53904c9e | 400 | static const char *follow_fork_mode_string = follow_fork_mode_parent; |
920d2a44 AC |
401 | static void |
402 | show_follow_fork_mode_string (struct ui_file *file, int from_tty, | |
403 | struct cmd_list_element *c, const char *value) | |
404 | { | |
3e43a32a MS |
405 | fprintf_filtered (file, |
406 | _("Debugger response to a program " | |
407 | "call of fork or vfork is \"%s\".\n"), | |
920d2a44 AC |
408 | value); |
409 | } | |
c906108c SS |
410 | \f |
411 | ||
d83ad864 DB |
412 | /* Handle changes to the inferior list based on the type of fork, |
413 | which process is being followed, and whether the other process | |
414 | should be detached. On entry inferior_ptid must be the ptid of | |
415 | the fork parent. At return inferior_ptid is the ptid of the | |
416 | followed inferior. */ | |
417 | ||
418 | static int | |
419 | follow_fork_inferior (int follow_child, int detach_fork) | |
420 | { | |
421 | int has_vforked; | |
79639e11 | 422 | ptid_t parent_ptid, child_ptid; |
d83ad864 DB |
423 | |
424 | has_vforked = (inferior_thread ()->pending_follow.kind | |
425 | == TARGET_WAITKIND_VFORKED); | |
79639e11 PA |
426 | parent_ptid = inferior_ptid; |
427 | child_ptid = inferior_thread ()->pending_follow.value.related_pid; | |
d83ad864 DB |
428 | |
429 | if (has_vforked | |
430 | && !non_stop /* Non-stop always resumes both branches. */ | |
3b12939d | 431 | && current_ui->prompt_state == PROMPT_BLOCKED |
d83ad864 DB |
432 | && !(follow_child || detach_fork || sched_multi)) |
433 | { | |
434 | /* The parent stays blocked inside the vfork syscall until the | |
435 | child execs or exits. If we don't let the child run, then | |
436 | the parent stays blocked. If we're telling the parent to run | |
437 | in the foreground, the user will not be able to ctrl-c to get | |
438 | back the terminal, effectively hanging the debug session. */ | |
439 | fprintf_filtered (gdb_stderr, _("\ | |
440 | Can not resume the parent process over vfork in the foreground while\n\ | |
441 | holding the child stopped. Try \"set detach-on-fork\" or \ | |
442 | \"set schedule-multiple\".\n")); | |
443 | /* FIXME output string > 80 columns. */ | |
444 | return 1; | |
445 | } | |
446 | ||
447 | if (!follow_child) | |
448 | { | |
449 | /* Detach new forked process? */ | |
450 | if (detach_fork) | |
451 | { | |
d83ad864 DB |
452 | /* Before detaching from the child, remove all breakpoints |
453 | from it. If we forked, then this has already been taken | |
454 | care of by infrun.c. If we vforked however, any | |
455 | breakpoint inserted in the parent is visible in the | |
456 | child, even those added while stopped in a vfork | |
457 | catchpoint. This will remove the breakpoints from the | |
458 | parent also, but they'll be reinserted below. */ | |
459 | if (has_vforked) | |
460 | { | |
461 | /* Keep breakpoints list in sync. */ | |
00431a78 | 462 | remove_breakpoints_inf (current_inferior ()); |
d83ad864 DB |
463 | } |
464 | ||
f67c0c91 | 465 | if (print_inferior_events) |
d83ad864 | 466 | { |
8dd06f7a | 467 | /* Ensure that we have a process ptid. */ |
e99b03dc | 468 | ptid_t process_ptid = ptid_t (child_ptid.pid ()); |
8dd06f7a | 469 | |
223ffa71 | 470 | target_terminal::ours_for_output (); |
d83ad864 | 471 | fprintf_filtered (gdb_stdlog, |
f67c0c91 | 472 | _("[Detaching after %s from child %s]\n"), |
6f259a23 | 473 | has_vforked ? "vfork" : "fork", |
a068643d | 474 | target_pid_to_str (process_ptid).c_str ()); |
d83ad864 DB |
475 | } |
476 | } | |
477 | else | |
478 | { | |
479 | struct inferior *parent_inf, *child_inf; | |
d83ad864 DB |
480 | |
481 | /* Add process to GDB's tables. */ | |
e99b03dc | 482 | child_inf = add_inferior (child_ptid.pid ()); |
d83ad864 DB |
483 | |
484 | parent_inf = current_inferior (); | |
485 | child_inf->attach_flag = parent_inf->attach_flag; | |
486 | copy_terminal_info (child_inf, parent_inf); | |
487 | child_inf->gdbarch = parent_inf->gdbarch; | |
488 | copy_inferior_target_desc_info (child_inf, parent_inf); | |
489 | ||
5ed8105e | 490 | scoped_restore_current_pspace_and_thread restore_pspace_thread; |
d83ad864 | 491 | |
79639e11 | 492 | inferior_ptid = child_ptid; |
f67c0c91 | 493 | add_thread_silent (inferior_ptid); |
2a00d7ce | 494 | set_current_inferior (child_inf); |
d83ad864 DB |
495 | child_inf->symfile_flags = SYMFILE_NO_READ; |
496 | ||
497 | /* If this is a vfork child, then the address-space is | |
498 | shared with the parent. */ | |
499 | if (has_vforked) | |
500 | { | |
501 | child_inf->pspace = parent_inf->pspace; | |
502 | child_inf->aspace = parent_inf->aspace; | |
503 | ||
504 | /* The parent will be frozen until the child is done | |
505 | with the shared region. Keep track of the | |
506 | parent. */ | |
507 | child_inf->vfork_parent = parent_inf; | |
508 | child_inf->pending_detach = 0; | |
509 | parent_inf->vfork_child = child_inf; | |
510 | parent_inf->pending_detach = 0; | |
511 | } | |
512 | else | |
513 | { | |
514 | child_inf->aspace = new_address_space (); | |
564b1e3f | 515 | child_inf->pspace = new program_space (child_inf->aspace); |
d83ad864 DB |
516 | child_inf->removable = 1; |
517 | set_current_program_space (child_inf->pspace); | |
518 | clone_program_space (child_inf->pspace, parent_inf->pspace); | |
519 | ||
520 | /* Let the shared library layer (e.g., solib-svr4) learn | |
521 | about this new process, relocate the cloned exec, pull | |
522 | in shared libraries, and install the solib event | |
523 | breakpoint. If a "cloned-VM" event was propagated | |
524 | better throughout the core, this wouldn't be | |
525 | required. */ | |
526 | solib_create_inferior_hook (0); | |
527 | } | |
d83ad864 DB |
528 | } |
529 | ||
530 | if (has_vforked) | |
531 | { | |
532 | struct inferior *parent_inf; | |
533 | ||
534 | parent_inf = current_inferior (); | |
535 | ||
536 | /* If we detached from the child, then we have to be careful | |
537 | to not insert breakpoints in the parent until the child | |
538 | is done with the shared memory region. However, if we're | |
539 | staying attached to the child, then we can and should | |
540 | insert breakpoints, so that we can debug it. A | |
541 | subsequent child exec or exit is enough to know when does | |
542 | the child stops using the parent's address space. */ | |
543 | parent_inf->waiting_for_vfork_done = detach_fork; | |
544 | parent_inf->pspace->breakpoints_not_allowed = detach_fork; | |
545 | } | |
546 | } | |
547 | else | |
548 | { | |
549 | /* Follow the child. */ | |
550 | struct inferior *parent_inf, *child_inf; | |
551 | struct program_space *parent_pspace; | |
552 | ||
f67c0c91 | 553 | if (print_inferior_events) |
d83ad864 | 554 | { |
f67c0c91 SDJ |
555 | std::string parent_pid = target_pid_to_str (parent_ptid); |
556 | std::string child_pid = target_pid_to_str (child_ptid); | |
557 | ||
223ffa71 | 558 | target_terminal::ours_for_output (); |
6f259a23 | 559 | fprintf_filtered (gdb_stdlog, |
f67c0c91 SDJ |
560 | _("[Attaching after %s %s to child %s]\n"), |
561 | parent_pid.c_str (), | |
6f259a23 | 562 | has_vforked ? "vfork" : "fork", |
f67c0c91 | 563 | child_pid.c_str ()); |
d83ad864 DB |
564 | } |
565 | ||
566 | /* Add the new inferior first, so that the target_detach below | |
567 | doesn't unpush the target. */ | |
568 | ||
e99b03dc | 569 | child_inf = add_inferior (child_ptid.pid ()); |
d83ad864 DB |
570 | |
571 | parent_inf = current_inferior (); | |
572 | child_inf->attach_flag = parent_inf->attach_flag; | |
573 | copy_terminal_info (child_inf, parent_inf); | |
574 | child_inf->gdbarch = parent_inf->gdbarch; | |
575 | copy_inferior_target_desc_info (child_inf, parent_inf); | |
576 | ||
577 | parent_pspace = parent_inf->pspace; | |
578 | ||
579 | /* If we're vforking, we want to hold on to the parent until the | |
580 | child exits or execs. At child exec or exit time we can | |
581 | remove the old breakpoints from the parent and detach or | |
582 | resume debugging it. Otherwise, detach the parent now; we'll | |
583 | want to reuse it's program/address spaces, but we can't set | |
584 | them to the child before removing breakpoints from the | |
585 | parent, otherwise, the breakpoints module could decide to | |
586 | remove breakpoints from the wrong process (since they'd be | |
587 | assigned to the same address space). */ | |
588 | ||
589 | if (has_vforked) | |
590 | { | |
591 | gdb_assert (child_inf->vfork_parent == NULL); | |
592 | gdb_assert (parent_inf->vfork_child == NULL); | |
593 | child_inf->vfork_parent = parent_inf; | |
594 | child_inf->pending_detach = 0; | |
595 | parent_inf->vfork_child = child_inf; | |
596 | parent_inf->pending_detach = detach_fork; | |
597 | parent_inf->waiting_for_vfork_done = 0; | |
598 | } | |
599 | else if (detach_fork) | |
6f259a23 | 600 | { |
f67c0c91 | 601 | if (print_inferior_events) |
6f259a23 | 602 | { |
8dd06f7a | 603 | /* Ensure that we have a process ptid. */ |
e99b03dc | 604 | ptid_t process_ptid = ptid_t (parent_ptid.pid ()); |
8dd06f7a | 605 | |
223ffa71 | 606 | target_terminal::ours_for_output (); |
6f259a23 | 607 | fprintf_filtered (gdb_stdlog, |
f67c0c91 SDJ |
608 | _("[Detaching after fork from " |
609 | "parent %s]\n"), | |
a068643d | 610 | target_pid_to_str (process_ptid).c_str ()); |
6f259a23 DB |
611 | } |
612 | ||
6e1e1966 | 613 | target_detach (parent_inf, 0); |
6f259a23 | 614 | } |
d83ad864 DB |
615 | |
616 | /* Note that the detach above makes PARENT_INF dangling. */ | |
617 | ||
618 | /* Add the child thread to the appropriate lists, and switch to | |
619 | this new thread, before cloning the program space, and | |
620 | informing the solib layer about this new process. */ | |
621 | ||
79639e11 | 622 | inferior_ptid = child_ptid; |
f67c0c91 | 623 | add_thread_silent (inferior_ptid); |
2a00d7ce | 624 | set_current_inferior (child_inf); |
d83ad864 DB |
625 | |
626 | /* If this is a vfork child, then the address-space is shared | |
627 | with the parent. If we detached from the parent, then we can | |
628 | reuse the parent's program/address spaces. */ | |
629 | if (has_vforked || detach_fork) | |
630 | { | |
631 | child_inf->pspace = parent_pspace; | |
632 | child_inf->aspace = child_inf->pspace->aspace; | |
633 | } | |
634 | else | |
635 | { | |
636 | child_inf->aspace = new_address_space (); | |
564b1e3f | 637 | child_inf->pspace = new program_space (child_inf->aspace); |
d83ad864 DB |
638 | child_inf->removable = 1; |
639 | child_inf->symfile_flags = SYMFILE_NO_READ; | |
640 | set_current_program_space (child_inf->pspace); | |
641 | clone_program_space (child_inf->pspace, parent_pspace); | |
642 | ||
643 | /* Let the shared library layer (e.g., solib-svr4) learn | |
644 | about this new process, relocate the cloned exec, pull in | |
645 | shared libraries, and install the solib event breakpoint. | |
646 | If a "cloned-VM" event was propagated better throughout | |
647 | the core, this wouldn't be required. */ | |
648 | solib_create_inferior_hook (0); | |
649 | } | |
650 | } | |
651 | ||
652 | return target_follow_fork (follow_child, detach_fork); | |
653 | } | |
654 | ||
e58b0e63 PA |
655 | /* Tell the target to follow the fork we're stopped at. Returns true |
656 | if the inferior should be resumed; false, if the target for some | |
657 | reason decided it's best not to resume. */ | |
658 | ||
6604731b | 659 | static int |
4ef3f3be | 660 | follow_fork (void) |
c906108c | 661 | { |
ea1dd7bc | 662 | int follow_child = (follow_fork_mode_string == follow_fork_mode_child); |
e58b0e63 PA |
663 | int should_resume = 1; |
664 | struct thread_info *tp; | |
665 | ||
666 | /* Copy user stepping state to the new inferior thread. FIXME: the | |
667 | followed fork child thread should have a copy of most of the | |
4e3990f4 DE |
668 | parent thread structure's run control related fields, not just these. |
669 | Initialized to avoid "may be used uninitialized" warnings from gcc. */ | |
670 | struct breakpoint *step_resume_breakpoint = NULL; | |
186c406b | 671 | struct breakpoint *exception_resume_breakpoint = NULL; |
4e3990f4 DE |
672 | CORE_ADDR step_range_start = 0; |
673 | CORE_ADDR step_range_end = 0; | |
674 | struct frame_id step_frame_id = { 0 }; | |
8980e177 | 675 | struct thread_fsm *thread_fsm = NULL; |
e58b0e63 PA |
676 | |
677 | if (!non_stop) | |
678 | { | |
679 | ptid_t wait_ptid; | |
680 | struct target_waitstatus wait_status; | |
681 | ||
682 | /* Get the last target status returned by target_wait(). */ | |
683 | get_last_target_status (&wait_ptid, &wait_status); | |
684 | ||
685 | /* If not stopped at a fork event, then there's nothing else to | |
686 | do. */ | |
687 | if (wait_status.kind != TARGET_WAITKIND_FORKED | |
688 | && wait_status.kind != TARGET_WAITKIND_VFORKED) | |
689 | return 1; | |
690 | ||
691 | /* Check if we switched over from WAIT_PTID, since the event was | |
692 | reported. */ | |
00431a78 PA |
693 | if (wait_ptid != minus_one_ptid |
694 | && inferior_ptid != wait_ptid) | |
e58b0e63 PA |
695 | { |
696 | /* We did. Switch back to WAIT_PTID thread, to tell the | |
697 | target to follow it (in either direction). We'll | |
698 | afterwards refuse to resume, and inform the user what | |
699 | happened. */ | |
00431a78 PA |
700 | thread_info *wait_thread |
701 | = find_thread_ptid (wait_ptid); | |
702 | switch_to_thread (wait_thread); | |
e58b0e63 PA |
703 | should_resume = 0; |
704 | } | |
705 | } | |
706 | ||
707 | tp = inferior_thread (); | |
708 | ||
709 | /* If there were any forks/vforks that were caught and are now to be | |
710 | followed, then do so now. */ | |
711 | switch (tp->pending_follow.kind) | |
712 | { | |
713 | case TARGET_WAITKIND_FORKED: | |
714 | case TARGET_WAITKIND_VFORKED: | |
715 | { | |
716 | ptid_t parent, child; | |
717 | ||
718 | /* If the user did a next/step, etc, over a fork call, | |
719 | preserve the stepping state in the fork child. */ | |
720 | if (follow_child && should_resume) | |
721 | { | |
8358c15c JK |
722 | step_resume_breakpoint = clone_momentary_breakpoint |
723 | (tp->control.step_resume_breakpoint); | |
16c381f0 JK |
724 | step_range_start = tp->control.step_range_start; |
725 | step_range_end = tp->control.step_range_end; | |
726 | step_frame_id = tp->control.step_frame_id; | |
186c406b TT |
727 | exception_resume_breakpoint |
728 | = clone_momentary_breakpoint (tp->control.exception_resume_breakpoint); | |
8980e177 | 729 | thread_fsm = tp->thread_fsm; |
e58b0e63 PA |
730 | |
731 | /* For now, delete the parent's sr breakpoint, otherwise, | |
732 | parent/child sr breakpoints are considered duplicates, | |
733 | and the child version will not be installed. Remove | |
734 | this when the breakpoints module becomes aware of | |
735 | inferiors and address spaces. */ | |
736 | delete_step_resume_breakpoint (tp); | |
16c381f0 JK |
737 | tp->control.step_range_start = 0; |
738 | tp->control.step_range_end = 0; | |
739 | tp->control.step_frame_id = null_frame_id; | |
186c406b | 740 | delete_exception_resume_breakpoint (tp); |
8980e177 | 741 | tp->thread_fsm = NULL; |
e58b0e63 PA |
742 | } |
743 | ||
744 | parent = inferior_ptid; | |
745 | child = tp->pending_follow.value.related_pid; | |
746 | ||
d83ad864 DB |
747 | /* Set up inferior(s) as specified by the caller, and tell the |
748 | target to do whatever is necessary to follow either parent | |
749 | or child. */ | |
750 | if (follow_fork_inferior (follow_child, detach_fork)) | |
e58b0e63 PA |
751 | { |
752 | /* Target refused to follow, or there's some other reason | |
753 | we shouldn't resume. */ | |
754 | should_resume = 0; | |
755 | } | |
756 | else | |
757 | { | |
758 | /* This pending follow fork event is now handled, one way | |
759 | or another. The previous selected thread may be gone | |
760 | from the lists by now, but if it is still around, need | |
761 | to clear the pending follow request. */ | |
e09875d4 | 762 | tp = find_thread_ptid (parent); |
e58b0e63 PA |
763 | if (tp) |
764 | tp->pending_follow.kind = TARGET_WAITKIND_SPURIOUS; | |
765 | ||
766 | /* This makes sure we don't try to apply the "Switched | |
767 | over from WAIT_PID" logic above. */ | |
768 | nullify_last_target_wait_ptid (); | |
769 | ||
1777feb0 | 770 | /* If we followed the child, switch to it... */ |
e58b0e63 PA |
771 | if (follow_child) |
772 | { | |
00431a78 PA |
773 | thread_info *child_thr = find_thread_ptid (child); |
774 | switch_to_thread (child_thr); | |
e58b0e63 PA |
775 | |
776 | /* ... and preserve the stepping state, in case the | |
777 | user was stepping over the fork call. */ | |
778 | if (should_resume) | |
779 | { | |
780 | tp = inferior_thread (); | |
8358c15c JK |
781 | tp->control.step_resume_breakpoint |
782 | = step_resume_breakpoint; | |
16c381f0 JK |
783 | tp->control.step_range_start = step_range_start; |
784 | tp->control.step_range_end = step_range_end; | |
785 | tp->control.step_frame_id = step_frame_id; | |
186c406b TT |
786 | tp->control.exception_resume_breakpoint |
787 | = exception_resume_breakpoint; | |
8980e177 | 788 | tp->thread_fsm = thread_fsm; |
e58b0e63 PA |
789 | } |
790 | else | |
791 | { | |
792 | /* If we get here, it was because we're trying to | |
793 | resume from a fork catchpoint, but, the user | |
794 | has switched threads away from the thread that | |
795 | forked. In that case, the resume command | |
796 | issued is most likely not applicable to the | |
797 | child, so just warn, and refuse to resume. */ | |
3e43a32a | 798 | warning (_("Not resuming: switched threads " |
fd7dcb94 | 799 | "before following fork child.")); |
e58b0e63 PA |
800 | } |
801 | ||
802 | /* Reset breakpoints in the child as appropriate. */ | |
803 | follow_inferior_reset_breakpoints (); | |
804 | } | |
e58b0e63 PA |
805 | } |
806 | } | |
807 | break; | |
808 | case TARGET_WAITKIND_SPURIOUS: | |
809 | /* Nothing to follow. */ | |
810 | break; | |
811 | default: | |
812 | internal_error (__FILE__, __LINE__, | |
813 | "Unexpected pending_follow.kind %d\n", | |
814 | tp->pending_follow.kind); | |
815 | break; | |
816 | } | |
c906108c | 817 | |
e58b0e63 | 818 | return should_resume; |
c906108c SS |
819 | } |
820 | ||
d83ad864 | 821 | static void |
6604731b | 822 | follow_inferior_reset_breakpoints (void) |
c906108c | 823 | { |
4e1c45ea PA |
824 | struct thread_info *tp = inferior_thread (); |
825 | ||
6604731b DJ |
826 | /* Was there a step_resume breakpoint? (There was if the user |
827 | did a "next" at the fork() call.) If so, explicitly reset its | |
a1aa2221 LM |
828 | thread number. Cloned step_resume breakpoints are disabled on |
829 | creation, so enable it here now that it is associated with the | |
830 | correct thread. | |
6604731b DJ |
831 | |
832 | step_resumes are a form of bp that are made to be per-thread. | |
833 | Since we created the step_resume bp when the parent process | |
834 | was being debugged, and now are switching to the child process, | |
835 | from the breakpoint package's viewpoint, that's a switch of | |
836 | "threads". We must update the bp's notion of which thread | |
837 | it is for, or it'll be ignored when it triggers. */ | |
838 | ||
8358c15c | 839 | if (tp->control.step_resume_breakpoint) |
a1aa2221 LM |
840 | { |
841 | breakpoint_re_set_thread (tp->control.step_resume_breakpoint); | |
842 | tp->control.step_resume_breakpoint->loc->enabled = 1; | |
843 | } | |
6604731b | 844 | |
a1aa2221 | 845 | /* Treat exception_resume breakpoints like step_resume breakpoints. */ |
186c406b | 846 | if (tp->control.exception_resume_breakpoint) |
a1aa2221 LM |
847 | { |
848 | breakpoint_re_set_thread (tp->control.exception_resume_breakpoint); | |
849 | tp->control.exception_resume_breakpoint->loc->enabled = 1; | |
850 | } | |
186c406b | 851 | |
6604731b DJ |
852 | /* Reinsert all breakpoints in the child. The user may have set |
853 | breakpoints after catching the fork, in which case those | |
854 | were never set in the child, but only in the parent. This makes | |
855 | sure the inserted breakpoints match the breakpoint list. */ | |
856 | ||
857 | breakpoint_re_set (); | |
858 | insert_breakpoints (); | |
c906108c | 859 | } |
c906108c | 860 | |
6c95b8df PA |
861 | /* The child has exited or execed: resume threads of the parent the |
862 | user wanted to be executing. */ | |
863 | ||
864 | static int | |
865 | proceed_after_vfork_done (struct thread_info *thread, | |
866 | void *arg) | |
867 | { | |
868 | int pid = * (int *) arg; | |
869 | ||
00431a78 PA |
870 | if (thread->ptid.pid () == pid |
871 | && thread->state == THREAD_RUNNING | |
872 | && !thread->executing | |
6c95b8df | 873 | && !thread->stop_requested |
a493e3e2 | 874 | && thread->suspend.stop_signal == GDB_SIGNAL_0) |
6c95b8df PA |
875 | { |
876 | if (debug_infrun) | |
877 | fprintf_unfiltered (gdb_stdlog, | |
878 | "infrun: resuming vfork parent thread %s\n", | |
a068643d | 879 | target_pid_to_str (thread->ptid).c_str ()); |
6c95b8df | 880 | |
00431a78 | 881 | switch_to_thread (thread); |
70509625 | 882 | clear_proceed_status (0); |
64ce06e4 | 883 | proceed ((CORE_ADDR) -1, GDB_SIGNAL_DEFAULT); |
6c95b8df PA |
884 | } |
885 | ||
886 | return 0; | |
887 | } | |
888 | ||
5ed8105e PA |
889 | /* Save/restore inferior_ptid, current program space and current |
890 | inferior. Only use this if the current context points at an exited | |
891 | inferior (and therefore there's no current thread to save). */ | |
892 | class scoped_restore_exited_inferior | |
893 | { | |
894 | public: | |
895 | scoped_restore_exited_inferior () | |
896 | : m_saved_ptid (&inferior_ptid) | |
897 | {} | |
898 | ||
899 | private: | |
900 | scoped_restore_tmpl<ptid_t> m_saved_ptid; | |
901 | scoped_restore_current_program_space m_pspace; | |
902 | scoped_restore_current_inferior m_inferior; | |
903 | }; | |
904 | ||
6c95b8df PA |
905 | /* Called whenever we notice an exec or exit event, to handle |
906 | detaching or resuming a vfork parent. */ | |
907 | ||
908 | static void | |
909 | handle_vfork_child_exec_or_exit (int exec) | |
910 | { | |
911 | struct inferior *inf = current_inferior (); | |
912 | ||
913 | if (inf->vfork_parent) | |
914 | { | |
915 | int resume_parent = -1; | |
916 | ||
917 | /* This exec or exit marks the end of the shared memory region | |
b73715df TV |
918 | between the parent and the child. Break the bonds. */ |
919 | inferior *vfork_parent = inf->vfork_parent; | |
920 | inf->vfork_parent->vfork_child = NULL; | |
921 | inf->vfork_parent = NULL; | |
6c95b8df | 922 | |
b73715df TV |
923 | /* If the user wanted to detach from the parent, now is the |
924 | time. */ | |
925 | if (vfork_parent->pending_detach) | |
6c95b8df PA |
926 | { |
927 | struct thread_info *tp; | |
6c95b8df PA |
928 | struct program_space *pspace; |
929 | struct address_space *aspace; | |
930 | ||
1777feb0 | 931 | /* follow-fork child, detach-on-fork on. */ |
6c95b8df | 932 | |
b73715df | 933 | vfork_parent->pending_detach = 0; |
68c9da30 | 934 | |
5ed8105e PA |
935 | gdb::optional<scoped_restore_exited_inferior> |
936 | maybe_restore_inferior; | |
937 | gdb::optional<scoped_restore_current_pspace_and_thread> | |
938 | maybe_restore_thread; | |
939 | ||
940 | /* If we're handling a child exit, then inferior_ptid points | |
941 | at the inferior's pid, not to a thread. */ | |
f50f4e56 | 942 | if (!exec) |
5ed8105e | 943 | maybe_restore_inferior.emplace (); |
f50f4e56 | 944 | else |
5ed8105e | 945 | maybe_restore_thread.emplace (); |
6c95b8df PA |
946 | |
947 | /* We're letting loose of the parent. */ | |
b73715df | 948 | tp = any_live_thread_of_inferior (vfork_parent); |
00431a78 | 949 | switch_to_thread (tp); |
6c95b8df PA |
950 | |
951 | /* We're about to detach from the parent, which implicitly | |
952 | removes breakpoints from its address space. There's a | |
953 | catch here: we want to reuse the spaces for the child, | |
954 | but, parent/child are still sharing the pspace at this | |
955 | point, although the exec in reality makes the kernel give | |
956 | the child a fresh set of new pages. The problem here is | |
957 | that the breakpoints module being unaware of this, would | |
958 | likely chose the child process to write to the parent | |
959 | address space. Swapping the child temporarily away from | |
960 | the spaces has the desired effect. Yes, this is "sort | |
961 | of" a hack. */ | |
962 | ||
963 | pspace = inf->pspace; | |
964 | aspace = inf->aspace; | |
965 | inf->aspace = NULL; | |
966 | inf->pspace = NULL; | |
967 | ||
f67c0c91 | 968 | if (print_inferior_events) |
6c95b8df | 969 | { |
a068643d | 970 | std::string pidstr |
b73715df | 971 | = target_pid_to_str (ptid_t (vfork_parent->pid)); |
f67c0c91 | 972 | |
223ffa71 | 973 | target_terminal::ours_for_output (); |
6c95b8df PA |
974 | |
975 | if (exec) | |
6f259a23 DB |
976 | { |
977 | fprintf_filtered (gdb_stdlog, | |
f67c0c91 | 978 | _("[Detaching vfork parent %s " |
a068643d | 979 | "after child exec]\n"), pidstr.c_str ()); |
6f259a23 | 980 | } |
6c95b8df | 981 | else |
6f259a23 DB |
982 | { |
983 | fprintf_filtered (gdb_stdlog, | |
f67c0c91 | 984 | _("[Detaching vfork parent %s " |
a068643d | 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 | ||
b73715df | 1004 | resume_parent = vfork_parent->pid; |
6c95b8df PA |
1005 | } |
1006 | else | |
1007 | { | |
6c95b8df PA |
1008 | struct program_space *pspace; |
1009 | ||
1010 | /* If this is a vfork child exiting, then the pspace and | |
1011 | aspaces were shared with the parent. Since we're | |
1012 | reporting the process exit, we'll be mourning all that is | |
1013 | found in the address space, and switching to null_ptid, | |
1014 | preparing to start a new inferior. But, since we don't | |
1015 | want to clobber the parent's address/program spaces, we | |
1016 | go ahead and create a new one for this exiting | |
1017 | inferior. */ | |
1018 | ||
5ed8105e PA |
1019 | /* Switch to null_ptid while running clone_program_space, so |
1020 | that clone_program_space doesn't want to read the | |
1021 | selected frame of a dead process. */ | |
1022 | scoped_restore restore_ptid | |
1023 | = make_scoped_restore (&inferior_ptid, null_ptid); | |
6c95b8df PA |
1024 | |
1025 | /* This inferior is dead, so avoid giving the breakpoints | |
1026 | module the option to write through to it (cloning a | |
1027 | program space resets breakpoints). */ | |
1028 | inf->aspace = NULL; | |
1029 | inf->pspace = NULL; | |
564b1e3f | 1030 | pspace = new program_space (maybe_new_address_space ()); |
6c95b8df PA |
1031 | set_current_program_space (pspace); |
1032 | inf->removable = 1; | |
7dcd53a0 | 1033 | inf->symfile_flags = SYMFILE_NO_READ; |
b73715df | 1034 | clone_program_space (pspace, vfork_parent->pspace); |
6c95b8df PA |
1035 | inf->pspace = pspace; |
1036 | inf->aspace = pspace->aspace; | |
1037 | ||
b73715df | 1038 | resume_parent = vfork_parent->pid; |
6c95b8df PA |
1039 | } |
1040 | ||
6c95b8df PA |
1041 | gdb_assert (current_program_space == inf->pspace); |
1042 | ||
1043 | if (non_stop && resume_parent != -1) | |
1044 | { | |
1045 | /* If the user wanted the parent to be running, let it go | |
1046 | free now. */ | |
5ed8105e | 1047 | scoped_restore_current_thread restore_thread; |
6c95b8df PA |
1048 | |
1049 | if (debug_infrun) | |
3e43a32a MS |
1050 | fprintf_unfiltered (gdb_stdlog, |
1051 | "infrun: resuming vfork parent process %d\n", | |
6c95b8df PA |
1052 | resume_parent); |
1053 | ||
1054 | iterate_over_threads (proceed_after_vfork_done, &resume_parent); | |
6c95b8df PA |
1055 | } |
1056 | } | |
1057 | } | |
1058 | ||
eb6c553b | 1059 | /* Enum strings for "set|show follow-exec-mode". */ |
6c95b8df PA |
1060 | |
1061 | static const char follow_exec_mode_new[] = "new"; | |
1062 | static const char follow_exec_mode_same[] = "same"; | |
40478521 | 1063 | static const char *const follow_exec_mode_names[] = |
6c95b8df PA |
1064 | { |
1065 | follow_exec_mode_new, | |
1066 | follow_exec_mode_same, | |
1067 | NULL, | |
1068 | }; | |
1069 | ||
1070 | static const char *follow_exec_mode_string = follow_exec_mode_same; | |
1071 | static void | |
1072 | show_follow_exec_mode_string (struct ui_file *file, int from_tty, | |
1073 | struct cmd_list_element *c, const char *value) | |
1074 | { | |
1075 | fprintf_filtered (file, _("Follow exec mode is \"%s\".\n"), value); | |
1076 | } | |
1077 | ||
ecf45d2c | 1078 | /* EXEC_FILE_TARGET is assumed to be non-NULL. */ |
1adeb98a | 1079 | |
c906108c | 1080 | static void |
ecf45d2c | 1081 | follow_exec (ptid_t ptid, char *exec_file_target) |
c906108c | 1082 | { |
6c95b8df | 1083 | struct inferior *inf = current_inferior (); |
e99b03dc | 1084 | int pid = ptid.pid (); |
94585166 | 1085 | ptid_t process_ptid; |
7a292a7a | 1086 | |
65d2b333 PW |
1087 | /* Switch terminal for any messages produced e.g. by |
1088 | breakpoint_re_set. */ | |
1089 | target_terminal::ours_for_output (); | |
1090 | ||
c906108c SS |
1091 | /* This is an exec event that we actually wish to pay attention to. |
1092 | Refresh our symbol table to the newly exec'd program, remove any | |
1093 | momentary bp's, etc. | |
1094 | ||
1095 | If there are breakpoints, they aren't really inserted now, | |
1096 | since the exec() transformed our inferior into a fresh set | |
1097 | of instructions. | |
1098 | ||
1099 | We want to preserve symbolic breakpoints on the list, since | |
1100 | we have hopes that they can be reset after the new a.out's | |
1101 | symbol table is read. | |
1102 | ||
1103 | However, any "raw" breakpoints must be removed from the list | |
1104 | (e.g., the solib bp's), since their address is probably invalid | |
1105 | now. | |
1106 | ||
1107 | And, we DON'T want to call delete_breakpoints() here, since | |
1108 | that may write the bp's "shadow contents" (the instruction | |
1109 | value that was overwritten witha TRAP instruction). Since | |
1777feb0 | 1110 | we now have a new a.out, those shadow contents aren't valid. */ |
6c95b8df PA |
1111 | |
1112 | mark_breakpoints_out (); | |
1113 | ||
95e50b27 PA |
1114 | /* The target reports the exec event to the main thread, even if |
1115 | some other thread does the exec, and even if the main thread was | |
1116 | stopped or already gone. We may still have non-leader threads of | |
1117 | the process on our list. E.g., on targets that don't have thread | |
1118 | exit events (like remote); or on native Linux in non-stop mode if | |
1119 | there were only two threads in the inferior and the non-leader | |
1120 | one is the one that execs (and nothing forces an update of the | |
1121 | thread list up to here). When debugging remotely, it's best to | |
1122 | avoid extra traffic, when possible, so avoid syncing the thread | |
1123 | list with the target, and instead go ahead and delete all threads | |
1124 | of the process but one that reported the event. Note this must | |
1125 | be done before calling update_breakpoints_after_exec, as | |
1126 | otherwise clearing the threads' resources would reference stale | |
1127 | thread breakpoints -- it may have been one of these threads that | |
1128 | stepped across the exec. We could just clear their stepping | |
1129 | states, but as long as we're iterating, might as well delete | |
1130 | them. Deleting them now rather than at the next user-visible | |
1131 | stop provides a nicer sequence of events for user and MI | |
1132 | notifications. */ | |
08036331 | 1133 | for (thread_info *th : all_threads_safe ()) |
d7e15655 | 1134 | if (th->ptid.pid () == pid && th->ptid != ptid) |
00431a78 | 1135 | delete_thread (th); |
95e50b27 PA |
1136 | |
1137 | /* We also need to clear any left over stale state for the | |
1138 | leader/event thread. E.g., if there was any step-resume | |
1139 | breakpoint or similar, it's gone now. We cannot truly | |
1140 | step-to-next statement through an exec(). */ | |
08036331 | 1141 | thread_info *th = inferior_thread (); |
8358c15c | 1142 | th->control.step_resume_breakpoint = NULL; |
186c406b | 1143 | th->control.exception_resume_breakpoint = NULL; |
34b7e8a6 | 1144 | th->control.single_step_breakpoints = NULL; |
16c381f0 JK |
1145 | th->control.step_range_start = 0; |
1146 | th->control.step_range_end = 0; | |
c906108c | 1147 | |
95e50b27 PA |
1148 | /* The user may have had the main thread held stopped in the |
1149 | previous image (e.g., schedlock on, or non-stop). Release | |
1150 | it now. */ | |
a75724bc PA |
1151 | th->stop_requested = 0; |
1152 | ||
95e50b27 PA |
1153 | update_breakpoints_after_exec (); |
1154 | ||
1777feb0 | 1155 | /* What is this a.out's name? */ |
f2907e49 | 1156 | process_ptid = ptid_t (pid); |
6c95b8df | 1157 | printf_unfiltered (_("%s is executing new program: %s\n"), |
a068643d | 1158 | target_pid_to_str (process_ptid).c_str (), |
ecf45d2c | 1159 | exec_file_target); |
c906108c SS |
1160 | |
1161 | /* We've followed the inferior through an exec. Therefore, the | |
1777feb0 | 1162 | inferior has essentially been killed & reborn. */ |
7a292a7a | 1163 | |
6ca15a4b | 1164 | breakpoint_init_inferior (inf_execd); |
e85a822c | 1165 | |
797bc1cb TT |
1166 | gdb::unique_xmalloc_ptr<char> exec_file_host |
1167 | = exec_file_find (exec_file_target, NULL); | |
ff862be4 | 1168 | |
ecf45d2c SL |
1169 | /* If we were unable to map the executable target pathname onto a host |
1170 | pathname, tell the user that. Otherwise GDB's subsequent behavior | |
1171 | is confusing. Maybe it would even be better to stop at this point | |
1172 | so that the user can specify a file manually before continuing. */ | |
1173 | if (exec_file_host == NULL) | |
1174 | warning (_("Could not load symbols for executable %s.\n" | |
1175 | "Do you need \"set sysroot\"?"), | |
1176 | exec_file_target); | |
c906108c | 1177 | |
cce9b6bf PA |
1178 | /* Reset the shared library package. This ensures that we get a |
1179 | shlib event when the child reaches "_start", at which point the | |
1180 | dld will have had a chance to initialize the child. */ | |
1181 | /* Also, loading a symbol file below may trigger symbol lookups, and | |
1182 | we don't want those to be satisfied by the libraries of the | |
1183 | previous incarnation of this process. */ | |
1184 | no_shared_libraries (NULL, 0); | |
1185 | ||
6c95b8df PA |
1186 | if (follow_exec_mode_string == follow_exec_mode_new) |
1187 | { | |
6c95b8df PA |
1188 | /* The user wants to keep the old inferior and program spaces |
1189 | around. Create a new fresh one, and switch to it. */ | |
1190 | ||
35ed81d4 SM |
1191 | /* Do exit processing for the original inferior before setting the new |
1192 | inferior's pid. Having two inferiors with the same pid would confuse | |
1193 | find_inferior_p(t)id. Transfer the terminal state and info from the | |
1194 | old to the new inferior. */ | |
1195 | inf = add_inferior_with_spaces (); | |
1196 | swap_terminal_info (inf, current_inferior ()); | |
057302ce | 1197 | exit_inferior_silent (current_inferior ()); |
17d8546e | 1198 | |
94585166 | 1199 | inf->pid = pid; |
ecf45d2c | 1200 | target_follow_exec (inf, exec_file_target); |
6c95b8df PA |
1201 | |
1202 | set_current_inferior (inf); | |
94585166 | 1203 | set_current_program_space (inf->pspace); |
c4c17fb0 | 1204 | add_thread (ptid); |
6c95b8df | 1205 | } |
9107fc8d PA |
1206 | else |
1207 | { | |
1208 | /* The old description may no longer be fit for the new image. | |
1209 | E.g, a 64-bit process exec'ed a 32-bit process. Clear the | |
1210 | old description; we'll read a new one below. No need to do | |
1211 | this on "follow-exec-mode new", as the old inferior stays | |
1212 | around (its description is later cleared/refetched on | |
1213 | restart). */ | |
1214 | target_clear_description (); | |
1215 | } | |
6c95b8df PA |
1216 | |
1217 | gdb_assert (current_program_space == inf->pspace); | |
1218 | ||
ecf45d2c SL |
1219 | /* Attempt to open the exec file. SYMFILE_DEFER_BP_RESET is used |
1220 | because the proper displacement for a PIE (Position Independent | |
1221 | Executable) main symbol file will only be computed by | |
1222 | solib_create_inferior_hook below. breakpoint_re_set would fail | |
1223 | to insert the breakpoints with the zero displacement. */ | |
797bc1cb | 1224 | try_open_exec_file (exec_file_host.get (), inf, SYMFILE_DEFER_BP_RESET); |
c906108c | 1225 | |
9107fc8d PA |
1226 | /* If the target can specify a description, read it. Must do this |
1227 | after flipping to the new executable (because the target supplied | |
1228 | description must be compatible with the executable's | |
1229 | architecture, and the old executable may e.g., be 32-bit, while | |
1230 | the new one 64-bit), and before anything involving memory or | |
1231 | registers. */ | |
1232 | target_find_description (); | |
1233 | ||
268a4a75 | 1234 | solib_create_inferior_hook (0); |
c906108c | 1235 | |
4efc6507 DE |
1236 | jit_inferior_created_hook (); |
1237 | ||
c1e56572 JK |
1238 | breakpoint_re_set (); |
1239 | ||
c906108c SS |
1240 | /* Reinsert all breakpoints. (Those which were symbolic have |
1241 | been reset to the proper address in the new a.out, thanks | |
1777feb0 | 1242 | to symbol_file_command...). */ |
c906108c SS |
1243 | insert_breakpoints (); |
1244 | ||
1245 | /* The next resume of this inferior should bring it to the shlib | |
1246 | startup breakpoints. (If the user had also set bp's on | |
1247 | "main" from the old (parent) process, then they'll auto- | |
1777feb0 | 1248 | matically get reset there in the new process.). */ |
c906108c SS |
1249 | } |
1250 | ||
c2829269 PA |
1251 | /* The queue of threads that need to do a step-over operation to get |
1252 | past e.g., a breakpoint. What technique is used to step over the | |
1253 | breakpoint/watchpoint does not matter -- all threads end up in the | |
1254 | same queue, to maintain rough temporal order of execution, in order | |
1255 | to avoid starvation, otherwise, we could e.g., find ourselves | |
1256 | constantly stepping the same couple threads past their breakpoints | |
1257 | over and over, if the single-step finish fast enough. */ | |
1258 | struct thread_info *step_over_queue_head; | |
1259 | ||
6c4cfb24 PA |
1260 | /* Bit flags indicating what the thread needs to step over. */ |
1261 | ||
8d297bbf | 1262 | enum step_over_what_flag |
6c4cfb24 PA |
1263 | { |
1264 | /* Step over a breakpoint. */ | |
1265 | STEP_OVER_BREAKPOINT = 1, | |
1266 | ||
1267 | /* Step past a non-continuable watchpoint, in order to let the | |
1268 | instruction execute so we can evaluate the watchpoint | |
1269 | expression. */ | |
1270 | STEP_OVER_WATCHPOINT = 2 | |
1271 | }; | |
8d297bbf | 1272 | DEF_ENUM_FLAGS_TYPE (enum step_over_what_flag, step_over_what); |
6c4cfb24 | 1273 | |
963f9c80 | 1274 | /* Info about an instruction that is being stepped over. */ |
31e77af2 PA |
1275 | |
1276 | struct step_over_info | |
1277 | { | |
963f9c80 PA |
1278 | /* If we're stepping past a breakpoint, this is the address space |
1279 | and address of the instruction the breakpoint is set at. We'll | |
1280 | skip inserting all breakpoints here. Valid iff ASPACE is | |
1281 | non-NULL. */ | |
8b86c959 | 1282 | const address_space *aspace; |
31e77af2 | 1283 | CORE_ADDR address; |
963f9c80 PA |
1284 | |
1285 | /* The instruction being stepped over triggers a nonsteppable | |
1286 | watchpoint. If true, we'll skip inserting watchpoints. */ | |
1287 | int nonsteppable_watchpoint_p; | |
21edc42f YQ |
1288 | |
1289 | /* The thread's global number. */ | |
1290 | int thread; | |
31e77af2 PA |
1291 | }; |
1292 | ||
1293 | /* The step-over info of the location that is being stepped over. | |
1294 | ||
1295 | Note that with async/breakpoint always-inserted mode, a user might | |
1296 | set a new breakpoint/watchpoint/etc. exactly while a breakpoint is | |
1297 | being stepped over. As setting a new breakpoint inserts all | |
1298 | breakpoints, we need to make sure the breakpoint being stepped over | |
1299 | isn't inserted then. We do that by only clearing the step-over | |
1300 | info when the step-over is actually finished (or aborted). | |
1301 | ||
1302 | Presently GDB can only step over one breakpoint at any given time. | |
1303 | Given threads that can't run code in the same address space as the | |
1304 | breakpoint's can't really miss the breakpoint, GDB could be taught | |
1305 | to step-over at most one breakpoint per address space (so this info | |
1306 | could move to the address space object if/when GDB is extended). | |
1307 | The set of breakpoints being stepped over will normally be much | |
1308 | smaller than the set of all breakpoints, so a flag in the | |
1309 | breakpoint location structure would be wasteful. A separate list | |
1310 | also saves complexity and run-time, as otherwise we'd have to go | |
1311 | through all breakpoint locations clearing their flag whenever we | |
1312 | start a new sequence. Similar considerations weigh against storing | |
1313 | this info in the thread object. Plus, not all step overs actually | |
1314 | have breakpoint locations -- e.g., stepping past a single-step | |
1315 | breakpoint, or stepping to complete a non-continuable | |
1316 | watchpoint. */ | |
1317 | static struct step_over_info step_over_info; | |
1318 | ||
1319 | /* Record the address of the breakpoint/instruction we're currently | |
ce0db137 DE |
1320 | stepping over. |
1321 | N.B. We record the aspace and address now, instead of say just the thread, | |
1322 | because when we need the info later the thread may be running. */ | |
31e77af2 PA |
1323 | |
1324 | static void | |
8b86c959 | 1325 | set_step_over_info (const address_space *aspace, CORE_ADDR address, |
21edc42f YQ |
1326 | int nonsteppable_watchpoint_p, |
1327 | int thread) | |
31e77af2 PA |
1328 | { |
1329 | step_over_info.aspace = aspace; | |
1330 | step_over_info.address = address; | |
963f9c80 | 1331 | step_over_info.nonsteppable_watchpoint_p = nonsteppable_watchpoint_p; |
21edc42f | 1332 | step_over_info.thread = thread; |
31e77af2 PA |
1333 | } |
1334 | ||
1335 | /* Called when we're not longer stepping over a breakpoint / an | |
1336 | instruction, so all breakpoints are free to be (re)inserted. */ | |
1337 | ||
1338 | static void | |
1339 | clear_step_over_info (void) | |
1340 | { | |
372316f1 PA |
1341 | if (debug_infrun) |
1342 | fprintf_unfiltered (gdb_stdlog, | |
1343 | "infrun: clear_step_over_info\n"); | |
31e77af2 PA |
1344 | step_over_info.aspace = NULL; |
1345 | step_over_info.address = 0; | |
963f9c80 | 1346 | step_over_info.nonsteppable_watchpoint_p = 0; |
21edc42f | 1347 | step_over_info.thread = -1; |
31e77af2 PA |
1348 | } |
1349 | ||
7f89fd65 | 1350 | /* See infrun.h. */ |
31e77af2 PA |
1351 | |
1352 | int | |
1353 | stepping_past_instruction_at (struct address_space *aspace, | |
1354 | CORE_ADDR address) | |
1355 | { | |
1356 | return (step_over_info.aspace != NULL | |
1357 | && breakpoint_address_match (aspace, address, | |
1358 | step_over_info.aspace, | |
1359 | step_over_info.address)); | |
1360 | } | |
1361 | ||
963f9c80 PA |
1362 | /* See infrun.h. */ |
1363 | ||
21edc42f YQ |
1364 | int |
1365 | thread_is_stepping_over_breakpoint (int thread) | |
1366 | { | |
1367 | return (step_over_info.thread != -1 | |
1368 | && thread == step_over_info.thread); | |
1369 | } | |
1370 | ||
1371 | /* See infrun.h. */ | |
1372 | ||
963f9c80 PA |
1373 | int |
1374 | stepping_past_nonsteppable_watchpoint (void) | |
1375 | { | |
1376 | return step_over_info.nonsteppable_watchpoint_p; | |
1377 | } | |
1378 | ||
6cc83d2a PA |
1379 | /* Returns true if step-over info is valid. */ |
1380 | ||
1381 | static int | |
1382 | step_over_info_valid_p (void) | |
1383 | { | |
963f9c80 PA |
1384 | return (step_over_info.aspace != NULL |
1385 | || stepping_past_nonsteppable_watchpoint ()); | |
6cc83d2a PA |
1386 | } |
1387 | ||
c906108c | 1388 | \f |
237fc4c9 PA |
1389 | /* Displaced stepping. */ |
1390 | ||
1391 | /* In non-stop debugging mode, we must take special care to manage | |
1392 | breakpoints properly; in particular, the traditional strategy for | |
1393 | stepping a thread past a breakpoint it has hit is unsuitable. | |
1394 | 'Displaced stepping' is a tactic for stepping one thread past a | |
1395 | breakpoint it has hit while ensuring that other threads running | |
1396 | concurrently will hit the breakpoint as they should. | |
1397 | ||
1398 | The traditional way to step a thread T off a breakpoint in a | |
1399 | multi-threaded program in all-stop mode is as follows: | |
1400 | ||
1401 | a0) Initially, all threads are stopped, and breakpoints are not | |
1402 | inserted. | |
1403 | a1) We single-step T, leaving breakpoints uninserted. | |
1404 | a2) We insert breakpoints, and resume all threads. | |
1405 | ||
1406 | In non-stop debugging, however, this strategy is unsuitable: we | |
1407 | don't want to have to stop all threads in the system in order to | |
1408 | continue or step T past a breakpoint. Instead, we use displaced | |
1409 | stepping: | |
1410 | ||
1411 | n0) Initially, T is stopped, other threads are running, and | |
1412 | breakpoints are inserted. | |
1413 | n1) We copy the instruction "under" the breakpoint to a separate | |
1414 | location, outside the main code stream, making any adjustments | |
1415 | to the instruction, register, and memory state as directed by | |
1416 | T's architecture. | |
1417 | n2) We single-step T over the instruction at its new location. | |
1418 | n3) We adjust the resulting register and memory state as directed | |
1419 | by T's architecture. This includes resetting T's PC to point | |
1420 | back into the main instruction stream. | |
1421 | n4) We resume T. | |
1422 | ||
1423 | This approach depends on the following gdbarch methods: | |
1424 | ||
1425 | - gdbarch_max_insn_length and gdbarch_displaced_step_location | |
1426 | indicate where to copy the instruction, and how much space must | |
1427 | be reserved there. We use these in step n1. | |
1428 | ||
1429 | - gdbarch_displaced_step_copy_insn copies a instruction to a new | |
1430 | address, and makes any necessary adjustments to the instruction, | |
1431 | register contents, and memory. We use this in step n1. | |
1432 | ||
1433 | - gdbarch_displaced_step_fixup adjusts registers and memory after | |
1434 | we have successfuly single-stepped the instruction, to yield the | |
1435 | same effect the instruction would have had if we had executed it | |
1436 | at its original address. We use this in step n3. | |
1437 | ||
237fc4c9 PA |
1438 | The gdbarch_displaced_step_copy_insn and |
1439 | gdbarch_displaced_step_fixup functions must be written so that | |
1440 | copying an instruction with gdbarch_displaced_step_copy_insn, | |
1441 | single-stepping across the copied instruction, and then applying | |
1442 | gdbarch_displaced_insn_fixup should have the same effects on the | |
1443 | thread's memory and registers as stepping the instruction in place | |
1444 | would have. Exactly which responsibilities fall to the copy and | |
1445 | which fall to the fixup is up to the author of those functions. | |
1446 | ||
1447 | See the comments in gdbarch.sh for details. | |
1448 | ||
1449 | Note that displaced stepping and software single-step cannot | |
1450 | currently be used in combination, although with some care I think | |
1451 | they could be made to. Software single-step works by placing | |
1452 | breakpoints on all possible subsequent instructions; if the | |
1453 | displaced instruction is a PC-relative jump, those breakpoints | |
1454 | could fall in very strange places --- on pages that aren't | |
1455 | executable, or at addresses that are not proper instruction | |
1456 | boundaries. (We do generally let other threads run while we wait | |
1457 | to hit the software single-step breakpoint, and they might | |
1458 | encounter such a corrupted instruction.) One way to work around | |
1459 | this would be to have gdbarch_displaced_step_copy_insn fully | |
1460 | simulate the effect of PC-relative instructions (and return NULL) | |
1461 | on architectures that use software single-stepping. | |
1462 | ||
1463 | In non-stop mode, we can have independent and simultaneous step | |
1464 | requests, so more than one thread may need to simultaneously step | |
1465 | over a breakpoint. The current implementation assumes there is | |
1466 | only one scratch space per process. In this case, we have to | |
1467 | serialize access to the scratch space. If thread A wants to step | |
1468 | over a breakpoint, but we are currently waiting for some other | |
1469 | thread to complete a displaced step, we leave thread A stopped and | |
1470 | place it in the displaced_step_request_queue. Whenever a displaced | |
1471 | step finishes, we pick the next thread in the queue and start a new | |
1472 | displaced step operation on it. See displaced_step_prepare and | |
1473 | displaced_step_fixup for details. */ | |
1474 | ||
cfba9872 SM |
1475 | /* Default destructor for displaced_step_closure. */ |
1476 | ||
1477 | displaced_step_closure::~displaced_step_closure () = default; | |
1478 | ||
fc1cf338 PA |
1479 | /* Get the displaced stepping state of process PID. */ |
1480 | ||
39a36629 | 1481 | static displaced_step_inferior_state * |
00431a78 | 1482 | get_displaced_stepping_state (inferior *inf) |
fc1cf338 | 1483 | { |
d20172fc | 1484 | return &inf->displaced_step_state; |
fc1cf338 PA |
1485 | } |
1486 | ||
372316f1 PA |
1487 | /* Returns true if any inferior has a thread doing a displaced |
1488 | step. */ | |
1489 | ||
39a36629 SM |
1490 | static bool |
1491 | displaced_step_in_progress_any_inferior () | |
372316f1 | 1492 | { |
d20172fc | 1493 | for (inferior *i : all_inferiors ()) |
39a36629 | 1494 | { |
d20172fc | 1495 | if (i->displaced_step_state.step_thread != nullptr) |
39a36629 SM |
1496 | return true; |
1497 | } | |
372316f1 | 1498 | |
39a36629 | 1499 | return false; |
372316f1 PA |
1500 | } |
1501 | ||
c0987663 YQ |
1502 | /* Return true if thread represented by PTID is doing a displaced |
1503 | step. */ | |
1504 | ||
1505 | static int | |
00431a78 | 1506 | displaced_step_in_progress_thread (thread_info *thread) |
c0987663 | 1507 | { |
00431a78 | 1508 | gdb_assert (thread != NULL); |
c0987663 | 1509 | |
d20172fc | 1510 | return get_displaced_stepping_state (thread->inf)->step_thread == thread; |
c0987663 YQ |
1511 | } |
1512 | ||
8f572e5c PA |
1513 | /* Return true if process PID has a thread doing a displaced step. */ |
1514 | ||
1515 | static int | |
00431a78 | 1516 | displaced_step_in_progress (inferior *inf) |
8f572e5c | 1517 | { |
d20172fc | 1518 | return get_displaced_stepping_state (inf)->step_thread != nullptr; |
fc1cf338 PA |
1519 | } |
1520 | ||
a42244db YQ |
1521 | /* If inferior is in displaced stepping, and ADDR equals to starting address |
1522 | of copy area, return corresponding displaced_step_closure. Otherwise, | |
1523 | return NULL. */ | |
1524 | ||
1525 | struct displaced_step_closure* | |
1526 | get_displaced_step_closure_by_addr (CORE_ADDR addr) | |
1527 | { | |
d20172fc | 1528 | displaced_step_inferior_state *displaced |
00431a78 | 1529 | = get_displaced_stepping_state (current_inferior ()); |
a42244db YQ |
1530 | |
1531 | /* If checking the mode of displaced instruction in copy area. */ | |
d20172fc | 1532 | if (displaced->step_thread != nullptr |
00431a78 | 1533 | && displaced->step_copy == addr) |
a42244db YQ |
1534 | return displaced->step_closure; |
1535 | ||
1536 | return NULL; | |
1537 | } | |
1538 | ||
fc1cf338 PA |
1539 | static void |
1540 | infrun_inferior_exit (struct inferior *inf) | |
1541 | { | |
d20172fc | 1542 | inf->displaced_step_state.reset (); |
fc1cf338 | 1543 | } |
237fc4c9 | 1544 | |
fff08868 HZ |
1545 | /* If ON, and the architecture supports it, GDB will use displaced |
1546 | stepping to step over breakpoints. If OFF, or if the architecture | |
1547 | doesn't support it, GDB will instead use the traditional | |
1548 | hold-and-step approach. If AUTO (which is the default), GDB will | |
1549 | decide which technique to use to step over breakpoints depending on | |
1550 | which of all-stop or non-stop mode is active --- displaced stepping | |
1551 | in non-stop mode; hold-and-step in all-stop mode. */ | |
1552 | ||
72d0e2c5 | 1553 | static enum auto_boolean can_use_displaced_stepping = AUTO_BOOLEAN_AUTO; |
fff08868 | 1554 | |
237fc4c9 PA |
1555 | static void |
1556 | show_can_use_displaced_stepping (struct ui_file *file, int from_tty, | |
1557 | struct cmd_list_element *c, | |
1558 | const char *value) | |
1559 | { | |
72d0e2c5 | 1560 | if (can_use_displaced_stepping == AUTO_BOOLEAN_AUTO) |
3e43a32a MS |
1561 | fprintf_filtered (file, |
1562 | _("Debugger's willingness to use displaced stepping " | |
1563 | "to step over breakpoints is %s (currently %s).\n"), | |
fbea99ea | 1564 | value, target_is_non_stop_p () ? "on" : "off"); |
fff08868 | 1565 | else |
3e43a32a MS |
1566 | fprintf_filtered (file, |
1567 | _("Debugger's willingness to use displaced stepping " | |
1568 | "to step over breakpoints is %s.\n"), value); | |
237fc4c9 PA |
1569 | } |
1570 | ||
fff08868 | 1571 | /* Return non-zero if displaced stepping can/should be used to step |
3fc8eb30 | 1572 | over breakpoints of thread TP. */ |
fff08868 | 1573 | |
237fc4c9 | 1574 | static int |
3fc8eb30 | 1575 | use_displaced_stepping (struct thread_info *tp) |
237fc4c9 | 1576 | { |
00431a78 | 1577 | struct regcache *regcache = get_thread_regcache (tp); |
ac7936df | 1578 | struct gdbarch *gdbarch = regcache->arch (); |
d20172fc SM |
1579 | displaced_step_inferior_state *displaced_state |
1580 | = get_displaced_stepping_state (tp->inf); | |
3fc8eb30 | 1581 | |
fbea99ea PA |
1582 | return (((can_use_displaced_stepping == AUTO_BOOLEAN_AUTO |
1583 | && target_is_non_stop_p ()) | |
72d0e2c5 | 1584 | || can_use_displaced_stepping == AUTO_BOOLEAN_TRUE) |
96429cc8 | 1585 | && gdbarch_displaced_step_copy_insn_p (gdbarch) |
3fc8eb30 | 1586 | && find_record_target () == NULL |
d20172fc | 1587 | && !displaced_state->failed_before); |
237fc4c9 PA |
1588 | } |
1589 | ||
1590 | /* Clean out any stray displaced stepping state. */ | |
1591 | static void | |
fc1cf338 | 1592 | displaced_step_clear (struct displaced_step_inferior_state *displaced) |
237fc4c9 PA |
1593 | { |
1594 | /* Indicate that there is no cleanup pending. */ | |
00431a78 | 1595 | displaced->step_thread = nullptr; |
237fc4c9 | 1596 | |
cfba9872 | 1597 | delete displaced->step_closure; |
6d45d4b4 | 1598 | displaced->step_closure = NULL; |
237fc4c9 PA |
1599 | } |
1600 | ||
9799571e TT |
1601 | /* A cleanup that wraps displaced_step_clear. */ |
1602 | using displaced_step_clear_cleanup | |
1603 | = FORWARD_SCOPE_EXIT (displaced_step_clear); | |
237fc4c9 PA |
1604 | |
1605 | /* Dump LEN bytes at BUF in hex to FILE, followed by a newline. */ | |
1606 | void | |
1607 | displaced_step_dump_bytes (struct ui_file *file, | |
1608 | const gdb_byte *buf, | |
1609 | size_t len) | |
1610 | { | |
1611 | int i; | |
1612 | ||
1613 | for (i = 0; i < len; i++) | |
1614 | fprintf_unfiltered (file, "%02x ", buf[i]); | |
1615 | fputs_unfiltered ("\n", file); | |
1616 | } | |
1617 | ||
1618 | /* Prepare to single-step, using displaced stepping. | |
1619 | ||
1620 | Note that we cannot use displaced stepping when we have a signal to | |
1621 | deliver. If we have a signal to deliver and an instruction to step | |
1622 | over, then after the step, there will be no indication from the | |
1623 | target whether the thread entered a signal handler or ignored the | |
1624 | signal and stepped over the instruction successfully --- both cases | |
1625 | result in a simple SIGTRAP. In the first case we mustn't do a | |
1626 | fixup, and in the second case we must --- but we can't tell which. | |
1627 | Comments in the code for 'random signals' in handle_inferior_event | |
1628 | explain how we handle this case instead. | |
1629 | ||
1630 | Returns 1 if preparing was successful -- this thread is going to be | |
7f03bd92 PA |
1631 | stepped now; 0 if displaced stepping this thread got queued; or -1 |
1632 | if this instruction can't be displaced stepped. */ | |
1633 | ||
237fc4c9 | 1634 | static int |
00431a78 | 1635 | displaced_step_prepare_throw (thread_info *tp) |
237fc4c9 | 1636 | { |
00431a78 | 1637 | regcache *regcache = get_thread_regcache (tp); |
ac7936df | 1638 | struct gdbarch *gdbarch = regcache->arch (); |
8b86c959 | 1639 | const address_space *aspace = regcache->aspace (); |
237fc4c9 PA |
1640 | CORE_ADDR original, copy; |
1641 | ULONGEST len; | |
1642 | struct displaced_step_closure *closure; | |
9e529e1d | 1643 | int status; |
237fc4c9 PA |
1644 | |
1645 | /* We should never reach this function if the architecture does not | |
1646 | support displaced stepping. */ | |
1647 | gdb_assert (gdbarch_displaced_step_copy_insn_p (gdbarch)); | |
1648 | ||
c2829269 PA |
1649 | /* Nor if the thread isn't meant to step over a breakpoint. */ |
1650 | gdb_assert (tp->control.trap_expected); | |
1651 | ||
c1e36e3e PA |
1652 | /* Disable range stepping while executing in the scratch pad. We |
1653 | want a single-step even if executing the displaced instruction in | |
1654 | the scratch buffer lands within the stepping range (e.g., a | |
1655 | jump/branch). */ | |
1656 | tp->control.may_range_step = 0; | |
1657 | ||
fc1cf338 PA |
1658 | /* We have to displaced step one thread at a time, as we only have |
1659 | access to a single scratch space per inferior. */ | |
237fc4c9 | 1660 | |
d20172fc SM |
1661 | displaced_step_inferior_state *displaced |
1662 | = get_displaced_stepping_state (tp->inf); | |
fc1cf338 | 1663 | |
00431a78 | 1664 | if (displaced->step_thread != nullptr) |
237fc4c9 PA |
1665 | { |
1666 | /* Already waiting for a displaced step to finish. Defer this | |
1667 | request and place in queue. */ | |
237fc4c9 PA |
1668 | |
1669 | if (debug_displaced) | |
1670 | fprintf_unfiltered (gdb_stdlog, | |
c2829269 | 1671 | "displaced: deferring step of %s\n", |
a068643d | 1672 | target_pid_to_str (tp->ptid).c_str ()); |
237fc4c9 | 1673 | |
c2829269 | 1674 | thread_step_over_chain_enqueue (tp); |
237fc4c9 PA |
1675 | return 0; |
1676 | } | |
1677 | else | |
1678 | { | |
1679 | if (debug_displaced) | |
1680 | fprintf_unfiltered (gdb_stdlog, | |
1681 | "displaced: stepping %s now\n", | |
a068643d | 1682 | target_pid_to_str (tp->ptid).c_str ()); |
237fc4c9 PA |
1683 | } |
1684 | ||
fc1cf338 | 1685 | displaced_step_clear (displaced); |
237fc4c9 | 1686 | |
00431a78 PA |
1687 | scoped_restore_current_thread restore_thread; |
1688 | ||
1689 | switch_to_thread (tp); | |
ad53cd71 | 1690 | |
515630c5 | 1691 | original = regcache_read_pc (regcache); |
237fc4c9 PA |
1692 | |
1693 | copy = gdbarch_displaced_step_location (gdbarch); | |
1694 | len = gdbarch_max_insn_length (gdbarch); | |
1695 | ||
d35ae833 PA |
1696 | if (breakpoint_in_range_p (aspace, copy, len)) |
1697 | { | |
1698 | /* There's a breakpoint set in the scratch pad location range | |
1699 | (which is usually around the entry point). We'd either | |
1700 | install it before resuming, which would overwrite/corrupt the | |
1701 | scratch pad, or if it was already inserted, this displaced | |
1702 | step would overwrite it. The latter is OK in the sense that | |
1703 | we already assume that no thread is going to execute the code | |
1704 | in the scratch pad range (after initial startup) anyway, but | |
1705 | the former is unacceptable. Simply punt and fallback to | |
1706 | stepping over this breakpoint in-line. */ | |
1707 | if (debug_displaced) | |
1708 | { | |
1709 | fprintf_unfiltered (gdb_stdlog, | |
1710 | "displaced: breakpoint set in scratch pad. " | |
1711 | "Stepping over breakpoint in-line instead.\n"); | |
1712 | } | |
1713 | ||
d35ae833 PA |
1714 | return -1; |
1715 | } | |
1716 | ||
237fc4c9 | 1717 | /* Save the original contents of the copy area. */ |
d20172fc SM |
1718 | displaced->step_saved_copy.resize (len); |
1719 | status = target_read_memory (copy, displaced->step_saved_copy.data (), len); | |
9e529e1d JK |
1720 | if (status != 0) |
1721 | throw_error (MEMORY_ERROR, | |
1722 | _("Error accessing memory address %s (%s) for " | |
1723 | "displaced-stepping scratch space."), | |
1724 | paddress (gdbarch, copy), safe_strerror (status)); | |
237fc4c9 PA |
1725 | if (debug_displaced) |
1726 | { | |
5af949e3 UW |
1727 | fprintf_unfiltered (gdb_stdlog, "displaced: saved %s: ", |
1728 | paddress (gdbarch, copy)); | |
fc1cf338 | 1729 | displaced_step_dump_bytes (gdb_stdlog, |
d20172fc | 1730 | displaced->step_saved_copy.data (), |
fc1cf338 | 1731 | len); |
237fc4c9 PA |
1732 | }; |
1733 | ||
1734 | closure = gdbarch_displaced_step_copy_insn (gdbarch, | |
ad53cd71 | 1735 | original, copy, regcache); |
7f03bd92 PA |
1736 | if (closure == NULL) |
1737 | { | |
1738 | /* The architecture doesn't know how or want to displaced step | |
1739 | this instruction or instruction sequence. Fallback to | |
1740 | stepping over the breakpoint in-line. */ | |
7f03bd92 PA |
1741 | return -1; |
1742 | } | |
237fc4c9 | 1743 | |
9f5a595d UW |
1744 | /* Save the information we need to fix things up if the step |
1745 | succeeds. */ | |
00431a78 | 1746 | displaced->step_thread = tp; |
fc1cf338 PA |
1747 | displaced->step_gdbarch = gdbarch; |
1748 | displaced->step_closure = closure; | |
1749 | displaced->step_original = original; | |
1750 | displaced->step_copy = copy; | |
9f5a595d | 1751 | |
9799571e TT |
1752 | { |
1753 | displaced_step_clear_cleanup cleanup (displaced); | |
237fc4c9 | 1754 | |
9799571e TT |
1755 | /* Resume execution at the copy. */ |
1756 | regcache_write_pc (regcache, copy); | |
237fc4c9 | 1757 | |
9799571e TT |
1758 | cleanup.release (); |
1759 | } | |
ad53cd71 | 1760 | |
237fc4c9 | 1761 | if (debug_displaced) |
5af949e3 UW |
1762 | fprintf_unfiltered (gdb_stdlog, "displaced: displaced pc to %s\n", |
1763 | paddress (gdbarch, copy)); | |
237fc4c9 | 1764 | |
237fc4c9 PA |
1765 | return 1; |
1766 | } | |
1767 | ||
3fc8eb30 PA |
1768 | /* Wrapper for displaced_step_prepare_throw that disabled further |
1769 | attempts at displaced stepping if we get a memory error. */ | |
1770 | ||
1771 | static int | |
00431a78 | 1772 | displaced_step_prepare (thread_info *thread) |
3fc8eb30 PA |
1773 | { |
1774 | int prepared = -1; | |
1775 | ||
a70b8144 | 1776 | try |
3fc8eb30 | 1777 | { |
00431a78 | 1778 | prepared = displaced_step_prepare_throw (thread); |
3fc8eb30 | 1779 | } |
230d2906 | 1780 | catch (const gdb_exception_error &ex) |
3fc8eb30 PA |
1781 | { |
1782 | struct displaced_step_inferior_state *displaced_state; | |
1783 | ||
16b41842 PA |
1784 | if (ex.error != MEMORY_ERROR |
1785 | && ex.error != NOT_SUPPORTED_ERROR) | |
eedc3f4f | 1786 | throw; |
3fc8eb30 PA |
1787 | |
1788 | if (debug_infrun) | |
1789 | { | |
1790 | fprintf_unfiltered (gdb_stdlog, | |
1791 | "infrun: disabling displaced stepping: %s\n", | |
3d6e9d23 | 1792 | ex.what ()); |
3fc8eb30 PA |
1793 | } |
1794 | ||
1795 | /* Be verbose if "set displaced-stepping" is "on", silent if | |
1796 | "auto". */ | |
1797 | if (can_use_displaced_stepping == AUTO_BOOLEAN_TRUE) | |
1798 | { | |
fd7dcb94 | 1799 | warning (_("disabling displaced stepping: %s"), |
3d6e9d23 | 1800 | ex.what ()); |
3fc8eb30 PA |
1801 | } |
1802 | ||
1803 | /* Disable further displaced stepping attempts. */ | |
1804 | displaced_state | |
00431a78 | 1805 | = get_displaced_stepping_state (thread->inf); |
3fc8eb30 PA |
1806 | displaced_state->failed_before = 1; |
1807 | } | |
3fc8eb30 PA |
1808 | |
1809 | return prepared; | |
1810 | } | |
1811 | ||
237fc4c9 | 1812 | static void |
3e43a32a MS |
1813 | write_memory_ptid (ptid_t ptid, CORE_ADDR memaddr, |
1814 | const gdb_byte *myaddr, int len) | |
237fc4c9 | 1815 | { |
2989a365 | 1816 | scoped_restore save_inferior_ptid = make_scoped_restore (&inferior_ptid); |
abbb1732 | 1817 | |
237fc4c9 PA |
1818 | inferior_ptid = ptid; |
1819 | write_memory (memaddr, myaddr, len); | |
237fc4c9 PA |
1820 | } |
1821 | ||
e2d96639 YQ |
1822 | /* Restore the contents of the copy area for thread PTID. */ |
1823 | ||
1824 | static void | |
1825 | displaced_step_restore (struct displaced_step_inferior_state *displaced, | |
1826 | ptid_t ptid) | |
1827 | { | |
1828 | ULONGEST len = gdbarch_max_insn_length (displaced->step_gdbarch); | |
1829 | ||
1830 | write_memory_ptid (ptid, displaced->step_copy, | |
d20172fc | 1831 | displaced->step_saved_copy.data (), len); |
e2d96639 YQ |
1832 | if (debug_displaced) |
1833 | fprintf_unfiltered (gdb_stdlog, "displaced: restored %s %s\n", | |
a068643d | 1834 | target_pid_to_str (ptid).c_str (), |
e2d96639 YQ |
1835 | paddress (displaced->step_gdbarch, |
1836 | displaced->step_copy)); | |
1837 | } | |
1838 | ||
372316f1 PA |
1839 | /* If we displaced stepped an instruction successfully, adjust |
1840 | registers and memory to yield the same effect the instruction would | |
1841 | have had if we had executed it at its original address, and return | |
1842 | 1. If the instruction didn't complete, relocate the PC and return | |
1843 | -1. If the thread wasn't displaced stepping, return 0. */ | |
1844 | ||
1845 | static int | |
00431a78 | 1846 | displaced_step_fixup (thread_info *event_thread, enum gdb_signal signal) |
237fc4c9 | 1847 | { |
fc1cf338 | 1848 | struct displaced_step_inferior_state *displaced |
00431a78 | 1849 | = get_displaced_stepping_state (event_thread->inf); |
372316f1 | 1850 | int ret; |
fc1cf338 | 1851 | |
00431a78 PA |
1852 | /* Was this event for the thread we displaced? */ |
1853 | if (displaced->step_thread != event_thread) | |
372316f1 | 1854 | return 0; |
237fc4c9 | 1855 | |
9799571e | 1856 | displaced_step_clear_cleanup cleanup (displaced); |
237fc4c9 | 1857 | |
00431a78 | 1858 | displaced_step_restore (displaced, displaced->step_thread->ptid); |
237fc4c9 | 1859 | |
cb71640d PA |
1860 | /* Fixup may need to read memory/registers. Switch to the thread |
1861 | that we're fixing up. Also, target_stopped_by_watchpoint checks | |
1862 | the current thread. */ | |
00431a78 | 1863 | switch_to_thread (event_thread); |
cb71640d | 1864 | |
237fc4c9 | 1865 | /* Did the instruction complete successfully? */ |
cb71640d PA |
1866 | if (signal == GDB_SIGNAL_TRAP |
1867 | && !(target_stopped_by_watchpoint () | |
1868 | && (gdbarch_have_nonsteppable_watchpoint (displaced->step_gdbarch) | |
1869 | || target_have_steppable_watchpoint))) | |
237fc4c9 PA |
1870 | { |
1871 | /* Fix up the resulting state. */ | |
fc1cf338 PA |
1872 | gdbarch_displaced_step_fixup (displaced->step_gdbarch, |
1873 | displaced->step_closure, | |
1874 | displaced->step_original, | |
1875 | displaced->step_copy, | |
00431a78 | 1876 | get_thread_regcache (displaced->step_thread)); |
372316f1 | 1877 | ret = 1; |
237fc4c9 PA |
1878 | } |
1879 | else | |
1880 | { | |
1881 | /* Since the instruction didn't complete, all we can do is | |
1882 | relocate the PC. */ | |
00431a78 | 1883 | struct regcache *regcache = get_thread_regcache (event_thread); |
515630c5 | 1884 | CORE_ADDR pc = regcache_read_pc (regcache); |
abbb1732 | 1885 | |
fc1cf338 | 1886 | pc = displaced->step_original + (pc - displaced->step_copy); |
515630c5 | 1887 | regcache_write_pc (regcache, pc); |
372316f1 | 1888 | ret = -1; |
237fc4c9 PA |
1889 | } |
1890 | ||
372316f1 | 1891 | return ret; |
c2829269 | 1892 | } |
1c5cfe86 | 1893 | |
4d9d9d04 PA |
1894 | /* Data to be passed around while handling an event. This data is |
1895 | discarded between events. */ | |
1896 | struct execution_control_state | |
1897 | { | |
1898 | ptid_t ptid; | |
1899 | /* The thread that got the event, if this was a thread event; NULL | |
1900 | otherwise. */ | |
1901 | struct thread_info *event_thread; | |
1902 | ||
1903 | struct target_waitstatus ws; | |
1904 | int stop_func_filled_in; | |
1905 | CORE_ADDR stop_func_start; | |
1906 | CORE_ADDR stop_func_end; | |
1907 | const char *stop_func_name; | |
1908 | int wait_some_more; | |
1909 | ||
1910 | /* True if the event thread hit the single-step breakpoint of | |
1911 | another thread. Thus the event doesn't cause a stop, the thread | |
1912 | needs to be single-stepped past the single-step breakpoint before | |
1913 | we can switch back to the original stepping thread. */ | |
1914 | int hit_singlestep_breakpoint; | |
1915 | }; | |
1916 | ||
1917 | /* Clear ECS and set it to point at TP. */ | |
c2829269 PA |
1918 | |
1919 | static void | |
4d9d9d04 PA |
1920 | reset_ecs (struct execution_control_state *ecs, struct thread_info *tp) |
1921 | { | |
1922 | memset (ecs, 0, sizeof (*ecs)); | |
1923 | ecs->event_thread = tp; | |
1924 | ecs->ptid = tp->ptid; | |
1925 | } | |
1926 | ||
1927 | static void keep_going_pass_signal (struct execution_control_state *ecs); | |
1928 | static void prepare_to_wait (struct execution_control_state *ecs); | |
2ac7589c | 1929 | static int keep_going_stepped_thread (struct thread_info *tp); |
8d297bbf | 1930 | static step_over_what thread_still_needs_step_over (struct thread_info *tp); |
4d9d9d04 PA |
1931 | |
1932 | /* Are there any pending step-over requests? If so, run all we can | |
1933 | now and return true. Otherwise, return false. */ | |
1934 | ||
1935 | static int | |
c2829269 PA |
1936 | start_step_over (void) |
1937 | { | |
1938 | struct thread_info *tp, *next; | |
1939 | ||
372316f1 PA |
1940 | /* Don't start a new step-over if we already have an in-line |
1941 | step-over operation ongoing. */ | |
1942 | if (step_over_info_valid_p ()) | |
1943 | return 0; | |
1944 | ||
c2829269 | 1945 | for (tp = step_over_queue_head; tp != NULL; tp = next) |
237fc4c9 | 1946 | { |
4d9d9d04 PA |
1947 | struct execution_control_state ecss; |
1948 | struct execution_control_state *ecs = &ecss; | |
8d297bbf | 1949 | step_over_what step_what; |
372316f1 | 1950 | int must_be_in_line; |
c2829269 | 1951 | |
c65d6b55 PA |
1952 | gdb_assert (!tp->stop_requested); |
1953 | ||
c2829269 | 1954 | next = thread_step_over_chain_next (tp); |
237fc4c9 | 1955 | |
c2829269 PA |
1956 | /* If this inferior already has a displaced step in process, |
1957 | don't start a new one. */ | |
00431a78 | 1958 | if (displaced_step_in_progress (tp->inf)) |
c2829269 PA |
1959 | continue; |
1960 | ||
372316f1 PA |
1961 | step_what = thread_still_needs_step_over (tp); |
1962 | must_be_in_line = ((step_what & STEP_OVER_WATCHPOINT) | |
1963 | || ((step_what & STEP_OVER_BREAKPOINT) | |
3fc8eb30 | 1964 | && !use_displaced_stepping (tp))); |
372316f1 PA |
1965 | |
1966 | /* We currently stop all threads of all processes to step-over | |
1967 | in-line. If we need to start a new in-line step-over, let | |
1968 | any pending displaced steps finish first. */ | |
1969 | if (must_be_in_line && displaced_step_in_progress_any_inferior ()) | |
1970 | return 0; | |
1971 | ||
c2829269 PA |
1972 | thread_step_over_chain_remove (tp); |
1973 | ||
1974 | if (step_over_queue_head == NULL) | |
1975 | { | |
1976 | if (debug_infrun) | |
1977 | fprintf_unfiltered (gdb_stdlog, | |
1978 | "infrun: step-over queue now empty\n"); | |
1979 | } | |
1980 | ||
372316f1 PA |
1981 | if (tp->control.trap_expected |
1982 | || tp->resumed | |
1983 | || tp->executing) | |
ad53cd71 | 1984 | { |
4d9d9d04 PA |
1985 | internal_error (__FILE__, __LINE__, |
1986 | "[%s] has inconsistent state: " | |
372316f1 | 1987 | "trap_expected=%d, resumed=%d, executing=%d\n", |
a068643d | 1988 | target_pid_to_str (tp->ptid).c_str (), |
4d9d9d04 | 1989 | tp->control.trap_expected, |
372316f1 | 1990 | tp->resumed, |
4d9d9d04 | 1991 | tp->executing); |
ad53cd71 | 1992 | } |
1c5cfe86 | 1993 | |
4d9d9d04 PA |
1994 | if (debug_infrun) |
1995 | fprintf_unfiltered (gdb_stdlog, | |
1996 | "infrun: resuming [%s] for step-over\n", | |
a068643d | 1997 | target_pid_to_str (tp->ptid).c_str ()); |
4d9d9d04 PA |
1998 | |
1999 | /* keep_going_pass_signal skips the step-over if the breakpoint | |
2000 | is no longer inserted. In all-stop, we want to keep looking | |
2001 | for a thread that needs a step-over instead of resuming TP, | |
2002 | because we wouldn't be able to resume anything else until the | |
2003 | target stops again. In non-stop, the resume always resumes | |
2004 | only TP, so it's OK to let the thread resume freely. */ | |
fbea99ea | 2005 | if (!target_is_non_stop_p () && !step_what) |
4d9d9d04 | 2006 | continue; |
8550d3b3 | 2007 | |
00431a78 | 2008 | switch_to_thread (tp); |
4d9d9d04 PA |
2009 | reset_ecs (ecs, tp); |
2010 | keep_going_pass_signal (ecs); | |
1c5cfe86 | 2011 | |
4d9d9d04 PA |
2012 | if (!ecs->wait_some_more) |
2013 | error (_("Command aborted.")); | |
1c5cfe86 | 2014 | |
372316f1 PA |
2015 | gdb_assert (tp->resumed); |
2016 | ||
2017 | /* If we started a new in-line step-over, we're done. */ | |
2018 | if (step_over_info_valid_p ()) | |
2019 | { | |
2020 | gdb_assert (tp->control.trap_expected); | |
2021 | return 1; | |
2022 | } | |
2023 | ||
fbea99ea | 2024 | if (!target_is_non_stop_p ()) |
4d9d9d04 PA |
2025 | { |
2026 | /* On all-stop, shouldn't have resumed unless we needed a | |
2027 | step over. */ | |
2028 | gdb_assert (tp->control.trap_expected | |
2029 | || tp->step_after_step_resume_breakpoint); | |
2030 | ||
2031 | /* With remote targets (at least), in all-stop, we can't | |
2032 | issue any further remote commands until the program stops | |
2033 | again. */ | |
2034 | return 1; | |
1c5cfe86 | 2035 | } |
c2829269 | 2036 | |
4d9d9d04 PA |
2037 | /* Either the thread no longer needed a step-over, or a new |
2038 | displaced stepping sequence started. Even in the latter | |
2039 | case, continue looking. Maybe we can also start another | |
2040 | displaced step on a thread of other process. */ | |
237fc4c9 | 2041 | } |
4d9d9d04 PA |
2042 | |
2043 | return 0; | |
237fc4c9 PA |
2044 | } |
2045 | ||
5231c1fd PA |
2046 | /* Update global variables holding ptids to hold NEW_PTID if they were |
2047 | holding OLD_PTID. */ | |
2048 | static void | |
2049 | infrun_thread_ptid_changed (ptid_t old_ptid, ptid_t new_ptid) | |
2050 | { | |
d7e15655 | 2051 | if (inferior_ptid == old_ptid) |
5231c1fd | 2052 | inferior_ptid = new_ptid; |
5231c1fd PA |
2053 | } |
2054 | ||
237fc4c9 | 2055 | \f |
c906108c | 2056 | |
53904c9e AC |
2057 | static const char schedlock_off[] = "off"; |
2058 | static const char schedlock_on[] = "on"; | |
2059 | static const char schedlock_step[] = "step"; | |
f2665db5 | 2060 | static const char schedlock_replay[] = "replay"; |
40478521 | 2061 | static const char *const scheduler_enums[] = { |
ef346e04 AC |
2062 | schedlock_off, |
2063 | schedlock_on, | |
2064 | schedlock_step, | |
f2665db5 | 2065 | schedlock_replay, |
ef346e04 AC |
2066 | NULL |
2067 | }; | |
f2665db5 | 2068 | static const char *scheduler_mode = schedlock_replay; |
920d2a44 AC |
2069 | static void |
2070 | show_scheduler_mode (struct ui_file *file, int from_tty, | |
2071 | struct cmd_list_element *c, const char *value) | |
2072 | { | |
3e43a32a MS |
2073 | fprintf_filtered (file, |
2074 | _("Mode for locking scheduler " | |
2075 | "during execution is \"%s\".\n"), | |
920d2a44 AC |
2076 | value); |
2077 | } | |
c906108c SS |
2078 | |
2079 | static void | |
eb4c3f4a | 2080 | set_schedlock_func (const char *args, int from_tty, struct cmd_list_element *c) |
c906108c | 2081 | { |
eefe576e AC |
2082 | if (!target_can_lock_scheduler) |
2083 | { | |
2084 | scheduler_mode = schedlock_off; | |
2085 | error (_("Target '%s' cannot support this command."), target_shortname); | |
2086 | } | |
c906108c SS |
2087 | } |
2088 | ||
d4db2f36 PA |
2089 | /* True if execution commands resume all threads of all processes by |
2090 | default; otherwise, resume only threads of the current inferior | |
2091 | process. */ | |
2092 | int sched_multi = 0; | |
2093 | ||
2facfe5c DD |
2094 | /* Try to setup for software single stepping over the specified location. |
2095 | Return 1 if target_resume() should use hardware single step. | |
2096 | ||
2097 | GDBARCH the current gdbarch. | |
2098 | PC the location to step over. */ | |
2099 | ||
2100 | static int | |
2101 | maybe_software_singlestep (struct gdbarch *gdbarch, CORE_ADDR pc) | |
2102 | { | |
2103 | int hw_step = 1; | |
2104 | ||
f02253f1 | 2105 | if (execution_direction == EXEC_FORWARD |
93f9a11f YQ |
2106 | && gdbarch_software_single_step_p (gdbarch)) |
2107 | hw_step = !insert_single_step_breakpoints (gdbarch); | |
2108 | ||
2facfe5c DD |
2109 | return hw_step; |
2110 | } | |
c906108c | 2111 | |
f3263aa4 PA |
2112 | /* See infrun.h. */ |
2113 | ||
09cee04b PA |
2114 | ptid_t |
2115 | user_visible_resume_ptid (int step) | |
2116 | { | |
f3263aa4 | 2117 | ptid_t resume_ptid; |
09cee04b | 2118 | |
09cee04b PA |
2119 | if (non_stop) |
2120 | { | |
2121 | /* With non-stop mode on, threads are always handled | |
2122 | individually. */ | |
2123 | resume_ptid = inferior_ptid; | |
2124 | } | |
2125 | else if ((scheduler_mode == schedlock_on) | |
03d46957 | 2126 | || (scheduler_mode == schedlock_step && step)) |
09cee04b | 2127 | { |
f3263aa4 PA |
2128 | /* User-settable 'scheduler' mode requires solo thread |
2129 | resume. */ | |
09cee04b PA |
2130 | resume_ptid = inferior_ptid; |
2131 | } | |
f2665db5 MM |
2132 | else if ((scheduler_mode == schedlock_replay) |
2133 | && target_record_will_replay (minus_one_ptid, execution_direction)) | |
2134 | { | |
2135 | /* User-settable 'scheduler' mode requires solo thread resume in replay | |
2136 | mode. */ | |
2137 | resume_ptid = inferior_ptid; | |
2138 | } | |
f3263aa4 PA |
2139 | else if (!sched_multi && target_supports_multi_process ()) |
2140 | { | |
2141 | /* Resume all threads of the current process (and none of other | |
2142 | processes). */ | |
e99b03dc | 2143 | resume_ptid = ptid_t (inferior_ptid.pid ()); |
f3263aa4 PA |
2144 | } |
2145 | else | |
2146 | { | |
2147 | /* Resume all threads of all processes. */ | |
2148 | resume_ptid = RESUME_ALL; | |
2149 | } | |
09cee04b PA |
2150 | |
2151 | return resume_ptid; | |
2152 | } | |
2153 | ||
fbea99ea PA |
2154 | /* Return a ptid representing the set of threads that we will resume, |
2155 | in the perspective of the target, assuming run control handling | |
2156 | does not require leaving some threads stopped (e.g., stepping past | |
2157 | breakpoint). USER_STEP indicates whether we're about to start the | |
2158 | target for a stepping command. */ | |
2159 | ||
2160 | static ptid_t | |
2161 | internal_resume_ptid (int user_step) | |
2162 | { | |
2163 | /* In non-stop, we always control threads individually. Note that | |
2164 | the target may always work in non-stop mode even with "set | |
2165 | non-stop off", in which case user_visible_resume_ptid could | |
2166 | return a wildcard ptid. */ | |
2167 | if (target_is_non_stop_p ()) | |
2168 | return inferior_ptid; | |
2169 | else | |
2170 | return user_visible_resume_ptid (user_step); | |
2171 | } | |
2172 | ||
64ce06e4 PA |
2173 | /* Wrapper for target_resume, that handles infrun-specific |
2174 | bookkeeping. */ | |
2175 | ||
2176 | static void | |
2177 | do_target_resume (ptid_t resume_ptid, int step, enum gdb_signal sig) | |
2178 | { | |
2179 | struct thread_info *tp = inferior_thread (); | |
2180 | ||
c65d6b55 PA |
2181 | gdb_assert (!tp->stop_requested); |
2182 | ||
64ce06e4 | 2183 | /* Install inferior's terminal modes. */ |
223ffa71 | 2184 | target_terminal::inferior (); |
64ce06e4 PA |
2185 | |
2186 | /* Avoid confusing the next resume, if the next stop/resume | |
2187 | happens to apply to another thread. */ | |
2188 | tp->suspend.stop_signal = GDB_SIGNAL_0; | |
2189 | ||
8f572e5c PA |
2190 | /* Advise target which signals may be handled silently. |
2191 | ||
2192 | If we have removed breakpoints because we are stepping over one | |
2193 | in-line (in any thread), we need to receive all signals to avoid | |
2194 | accidentally skipping a breakpoint during execution of a signal | |
2195 | handler. | |
2196 | ||
2197 | Likewise if we're displaced stepping, otherwise a trap for a | |
2198 | breakpoint in a signal handler might be confused with the | |
2199 | displaced step finishing. We don't make the displaced_step_fixup | |
2200 | step distinguish the cases instead, because: | |
2201 | ||
2202 | - a backtrace while stopped in the signal handler would show the | |
2203 | scratch pad as frame older than the signal handler, instead of | |
2204 | the real mainline code. | |
2205 | ||
2206 | - when the thread is later resumed, the signal handler would | |
2207 | return to the scratch pad area, which would no longer be | |
2208 | valid. */ | |
2209 | if (step_over_info_valid_p () | |
00431a78 | 2210 | || displaced_step_in_progress (tp->inf)) |
adc6a863 | 2211 | target_pass_signals ({}); |
64ce06e4 | 2212 | else |
adc6a863 | 2213 | target_pass_signals (signal_pass); |
64ce06e4 PA |
2214 | |
2215 | target_resume (resume_ptid, step, sig); | |
85ad3aaf PA |
2216 | |
2217 | target_commit_resume (); | |
64ce06e4 PA |
2218 | } |
2219 | ||
d930703d | 2220 | /* Resume the inferior. SIG is the signal to give the inferior |
71d378ae PA |
2221 | (GDB_SIGNAL_0 for none). Note: don't call this directly; instead |
2222 | call 'resume', which handles exceptions. */ | |
c906108c | 2223 | |
71d378ae PA |
2224 | static void |
2225 | resume_1 (enum gdb_signal sig) | |
c906108c | 2226 | { |
515630c5 | 2227 | struct regcache *regcache = get_current_regcache (); |
ac7936df | 2228 | struct gdbarch *gdbarch = regcache->arch (); |
4e1c45ea | 2229 | struct thread_info *tp = inferior_thread (); |
515630c5 | 2230 | CORE_ADDR pc = regcache_read_pc (regcache); |
8b86c959 | 2231 | const address_space *aspace = regcache->aspace (); |
b0f16a3e | 2232 | ptid_t resume_ptid; |
856e7dd6 PA |
2233 | /* This represents the user's step vs continue request. When |
2234 | deciding whether "set scheduler-locking step" applies, it's the | |
2235 | user's intention that counts. */ | |
2236 | const int user_step = tp->control.stepping_command; | |
64ce06e4 PA |
2237 | /* This represents what we'll actually request the target to do. |
2238 | This can decay from a step to a continue, if e.g., we need to | |
2239 | implement single-stepping with breakpoints (software | |
2240 | single-step). */ | |
6b403daa | 2241 | int step; |
c7e8a53c | 2242 | |
c65d6b55 | 2243 | gdb_assert (!tp->stop_requested); |
c2829269 PA |
2244 | gdb_assert (!thread_is_in_step_over_chain (tp)); |
2245 | ||
372316f1 PA |
2246 | if (tp->suspend.waitstatus_pending_p) |
2247 | { | |
2248 | if (debug_infrun) | |
2249 | { | |
23fdd69e SM |
2250 | std::string statstr |
2251 | = target_waitstatus_to_string (&tp->suspend.waitstatus); | |
372316f1 | 2252 | |
372316f1 | 2253 | fprintf_unfiltered (gdb_stdlog, |
23fdd69e SM |
2254 | "infrun: resume: thread %s has pending wait " |
2255 | "status %s (currently_stepping=%d).\n", | |
a068643d TT |
2256 | target_pid_to_str (tp->ptid).c_str (), |
2257 | statstr.c_str (), | |
372316f1 | 2258 | currently_stepping (tp)); |
372316f1 PA |
2259 | } |
2260 | ||
2261 | tp->resumed = 1; | |
2262 | ||
2263 | /* FIXME: What should we do if we are supposed to resume this | |
2264 | thread with a signal? Maybe we should maintain a queue of | |
2265 | pending signals to deliver. */ | |
2266 | if (sig != GDB_SIGNAL_0) | |
2267 | { | |
fd7dcb94 | 2268 | warning (_("Couldn't deliver signal %s to %s."), |
a068643d TT |
2269 | gdb_signal_to_name (sig), |
2270 | target_pid_to_str (tp->ptid).c_str ()); | |
372316f1 PA |
2271 | } |
2272 | ||
2273 | tp->suspend.stop_signal = GDB_SIGNAL_0; | |
372316f1 PA |
2274 | |
2275 | if (target_can_async_p ()) | |
9516f85a AB |
2276 | { |
2277 | target_async (1); | |
2278 | /* Tell the event loop we have an event to process. */ | |
2279 | mark_async_event_handler (infrun_async_inferior_event_token); | |
2280 | } | |
372316f1 PA |
2281 | return; |
2282 | } | |
2283 | ||
2284 | tp->stepped_breakpoint = 0; | |
2285 | ||
6b403daa PA |
2286 | /* Depends on stepped_breakpoint. */ |
2287 | step = currently_stepping (tp); | |
2288 | ||
74609e71 YQ |
2289 | if (current_inferior ()->waiting_for_vfork_done) |
2290 | { | |
48f9886d PA |
2291 | /* Don't try to single-step a vfork parent that is waiting for |
2292 | the child to get out of the shared memory region (by exec'ing | |
2293 | or exiting). This is particularly important on software | |
2294 | single-step archs, as the child process would trip on the | |
2295 | software single step breakpoint inserted for the parent | |
2296 | process. Since the parent will not actually execute any | |
2297 | instruction until the child is out of the shared region (such | |
2298 | are vfork's semantics), it is safe to simply continue it. | |
2299 | Eventually, we'll see a TARGET_WAITKIND_VFORK_DONE event for | |
2300 | the parent, and tell it to `keep_going', which automatically | |
2301 | re-sets it stepping. */ | |
74609e71 YQ |
2302 | if (debug_infrun) |
2303 | fprintf_unfiltered (gdb_stdlog, | |
2304 | "infrun: resume : clear step\n"); | |
a09dd441 | 2305 | step = 0; |
74609e71 YQ |
2306 | } |
2307 | ||
527159b7 | 2308 | if (debug_infrun) |
237fc4c9 | 2309 | fprintf_unfiltered (gdb_stdlog, |
c9737c08 | 2310 | "infrun: resume (step=%d, signal=%s), " |
0d9a9a5f | 2311 | "trap_expected=%d, current thread [%s] at %s\n", |
c9737c08 PA |
2312 | step, gdb_signal_to_symbol_string (sig), |
2313 | tp->control.trap_expected, | |
a068643d | 2314 | target_pid_to_str (inferior_ptid).c_str (), |
0d9a9a5f | 2315 | paddress (gdbarch, pc)); |
c906108c | 2316 | |
c2c6d25f JM |
2317 | /* Normally, by the time we reach `resume', the breakpoints are either |
2318 | removed or inserted, as appropriate. The exception is if we're sitting | |
2319 | at a permanent breakpoint; we need to step over it, but permanent | |
2320 | breakpoints can't be removed. So we have to test for it here. */ | |
6c95b8df | 2321 | if (breakpoint_here_p (aspace, pc) == permanent_breakpoint_here) |
6d350bb5 | 2322 | { |
af48d08f PA |
2323 | if (sig != GDB_SIGNAL_0) |
2324 | { | |
2325 | /* We have a signal to pass to the inferior. The resume | |
2326 | may, or may not take us to the signal handler. If this | |
2327 | is a step, we'll need to stop in the signal handler, if | |
2328 | there's one, (if the target supports stepping into | |
2329 | handlers), or in the next mainline instruction, if | |
2330 | there's no handler. If this is a continue, we need to be | |
2331 | sure to run the handler with all breakpoints inserted. | |
2332 | In all cases, set a breakpoint at the current address | |
2333 | (where the handler returns to), and once that breakpoint | |
2334 | is hit, resume skipping the permanent breakpoint. If | |
2335 | that breakpoint isn't hit, then we've stepped into the | |
2336 | signal handler (or hit some other event). We'll delete | |
2337 | the step-resume breakpoint then. */ | |
2338 | ||
2339 | if (debug_infrun) | |
2340 | fprintf_unfiltered (gdb_stdlog, | |
2341 | "infrun: resume: skipping permanent breakpoint, " | |
2342 | "deliver signal first\n"); | |
2343 | ||
2344 | clear_step_over_info (); | |
2345 | tp->control.trap_expected = 0; | |
2346 | ||
2347 | if (tp->control.step_resume_breakpoint == NULL) | |
2348 | { | |
2349 | /* Set a "high-priority" step-resume, as we don't want | |
2350 | user breakpoints at PC to trigger (again) when this | |
2351 | hits. */ | |
2352 | insert_hp_step_resume_breakpoint_at_frame (get_current_frame ()); | |
2353 | gdb_assert (tp->control.step_resume_breakpoint->loc->permanent); | |
2354 | ||
2355 | tp->step_after_step_resume_breakpoint = step; | |
2356 | } | |
2357 | ||
2358 | insert_breakpoints (); | |
2359 | } | |
2360 | else | |
2361 | { | |
2362 | /* There's no signal to pass, we can go ahead and skip the | |
2363 | permanent breakpoint manually. */ | |
2364 | if (debug_infrun) | |
2365 | fprintf_unfiltered (gdb_stdlog, | |
2366 | "infrun: resume: skipping permanent breakpoint\n"); | |
2367 | gdbarch_skip_permanent_breakpoint (gdbarch, regcache); | |
2368 | /* Update pc to reflect the new address from which we will | |
2369 | execute instructions. */ | |
2370 | pc = regcache_read_pc (regcache); | |
2371 | ||
2372 | if (step) | |
2373 | { | |
2374 | /* We've already advanced the PC, so the stepping part | |
2375 | is done. Now we need to arrange for a trap to be | |
2376 | reported to handle_inferior_event. Set a breakpoint | |
2377 | at the current PC, and run to it. Don't update | |
2378 | prev_pc, because if we end in | |
44a1ee51 PA |
2379 | switch_back_to_stepped_thread, we want the "expected |
2380 | thread advanced also" branch to be taken. IOW, we | |
2381 | don't want this thread to step further from PC | |
af48d08f | 2382 | (overstep). */ |
1ac806b8 | 2383 | gdb_assert (!step_over_info_valid_p ()); |
af48d08f PA |
2384 | insert_single_step_breakpoint (gdbarch, aspace, pc); |
2385 | insert_breakpoints (); | |
2386 | ||
fbea99ea | 2387 | resume_ptid = internal_resume_ptid (user_step); |
1ac806b8 | 2388 | do_target_resume (resume_ptid, 0, GDB_SIGNAL_0); |
372316f1 | 2389 | tp->resumed = 1; |
af48d08f PA |
2390 | return; |
2391 | } | |
2392 | } | |
6d350bb5 | 2393 | } |
c2c6d25f | 2394 | |
c1e36e3e PA |
2395 | /* If we have a breakpoint to step over, make sure to do a single |
2396 | step only. Same if we have software watchpoints. */ | |
2397 | if (tp->control.trap_expected || bpstat_should_step ()) | |
2398 | tp->control.may_range_step = 0; | |
2399 | ||
237fc4c9 PA |
2400 | /* If enabled, step over breakpoints by executing a copy of the |
2401 | instruction at a different address. | |
2402 | ||
2403 | We can't use displaced stepping when we have a signal to deliver; | |
2404 | the comments for displaced_step_prepare explain why. The | |
2405 | comments in the handle_inferior event for dealing with 'random | |
74609e71 YQ |
2406 | signals' explain what we do instead. |
2407 | ||
2408 | We can't use displaced stepping when we are waiting for vfork_done | |
2409 | event, displaced stepping breaks the vfork child similarly as single | |
2410 | step software breakpoint. */ | |
3fc8eb30 PA |
2411 | if (tp->control.trap_expected |
2412 | && use_displaced_stepping (tp) | |
cb71640d | 2413 | && !step_over_info_valid_p () |
a493e3e2 | 2414 | && sig == GDB_SIGNAL_0 |
74609e71 | 2415 | && !current_inferior ()->waiting_for_vfork_done) |
237fc4c9 | 2416 | { |
00431a78 | 2417 | int prepared = displaced_step_prepare (tp); |
fc1cf338 | 2418 | |
3fc8eb30 | 2419 | if (prepared == 0) |
d56b7306 | 2420 | { |
4d9d9d04 PA |
2421 | if (debug_infrun) |
2422 | fprintf_unfiltered (gdb_stdlog, | |
2423 | "Got placed in step-over queue\n"); | |
2424 | ||
2425 | tp->control.trap_expected = 0; | |
d56b7306 VP |
2426 | return; |
2427 | } | |
3fc8eb30 PA |
2428 | else if (prepared < 0) |
2429 | { | |
2430 | /* Fallback to stepping over the breakpoint in-line. */ | |
2431 | ||
2432 | if (target_is_non_stop_p ()) | |
2433 | stop_all_threads (); | |
2434 | ||
a01bda52 | 2435 | set_step_over_info (regcache->aspace (), |
21edc42f | 2436 | regcache_read_pc (regcache), 0, tp->global_num); |
3fc8eb30 PA |
2437 | |
2438 | step = maybe_software_singlestep (gdbarch, pc); | |
2439 | ||
2440 | insert_breakpoints (); | |
2441 | } | |
2442 | else if (prepared > 0) | |
2443 | { | |
2444 | struct displaced_step_inferior_state *displaced; | |
99e40580 | 2445 | |
3fc8eb30 PA |
2446 | /* Update pc to reflect the new address from which we will |
2447 | execute instructions due to displaced stepping. */ | |
00431a78 | 2448 | pc = regcache_read_pc (get_thread_regcache (tp)); |
ca7781d2 | 2449 | |
00431a78 | 2450 | displaced = get_displaced_stepping_state (tp->inf); |
3fc8eb30 PA |
2451 | step = gdbarch_displaced_step_hw_singlestep (gdbarch, |
2452 | displaced->step_closure); | |
2453 | } | |
237fc4c9 PA |
2454 | } |
2455 | ||
2facfe5c | 2456 | /* Do we need to do it the hard way, w/temp breakpoints? */ |
99e40580 | 2457 | else if (step) |
2facfe5c | 2458 | step = maybe_software_singlestep (gdbarch, pc); |
c906108c | 2459 | |
30852783 UW |
2460 | /* Currently, our software single-step implementation leads to different |
2461 | results than hardware single-stepping in one situation: when stepping | |
2462 | into delivering a signal which has an associated signal handler, | |
2463 | hardware single-step will stop at the first instruction of the handler, | |
2464 | while software single-step will simply skip execution of the handler. | |
2465 | ||
2466 | For now, this difference in behavior is accepted since there is no | |
2467 | easy way to actually implement single-stepping into a signal handler | |
2468 | without kernel support. | |
2469 | ||
2470 | However, there is one scenario where this difference leads to follow-on | |
2471 | problems: if we're stepping off a breakpoint by removing all breakpoints | |
2472 | and then single-stepping. In this case, the software single-step | |
2473 | behavior means that even if there is a *breakpoint* in the signal | |
2474 | handler, GDB still would not stop. | |
2475 | ||
2476 | Fortunately, we can at least fix this particular issue. We detect | |
2477 | here the case where we are about to deliver a signal while software | |
2478 | single-stepping with breakpoints removed. In this situation, we | |
2479 | revert the decisions to remove all breakpoints and insert single- | |
2480 | step breakpoints, and instead we install a step-resume breakpoint | |
2481 | at the current address, deliver the signal without stepping, and | |
2482 | once we arrive back at the step-resume breakpoint, actually step | |
2483 | over the breakpoint we originally wanted to step over. */ | |
34b7e8a6 | 2484 | if (thread_has_single_step_breakpoints_set (tp) |
6cc83d2a PA |
2485 | && sig != GDB_SIGNAL_0 |
2486 | && step_over_info_valid_p ()) | |
30852783 UW |
2487 | { |
2488 | /* If we have nested signals or a pending signal is delivered | |
2489 | immediately after a handler returns, might might already have | |
2490 | a step-resume breakpoint set on the earlier handler. We cannot | |
2491 | set another step-resume breakpoint; just continue on until the | |
2492 | original breakpoint is hit. */ | |
2493 | if (tp->control.step_resume_breakpoint == NULL) | |
2494 | { | |
2c03e5be | 2495 | insert_hp_step_resume_breakpoint_at_frame (get_current_frame ()); |
30852783 UW |
2496 | tp->step_after_step_resume_breakpoint = 1; |
2497 | } | |
2498 | ||
34b7e8a6 | 2499 | delete_single_step_breakpoints (tp); |
30852783 | 2500 | |
31e77af2 | 2501 | clear_step_over_info (); |
30852783 | 2502 | tp->control.trap_expected = 0; |
31e77af2 PA |
2503 | |
2504 | insert_breakpoints (); | |
30852783 UW |
2505 | } |
2506 | ||
b0f16a3e SM |
2507 | /* If STEP is set, it's a request to use hardware stepping |
2508 | facilities. But in that case, we should never | |
2509 | use singlestep breakpoint. */ | |
34b7e8a6 | 2510 | gdb_assert (!(thread_has_single_step_breakpoints_set (tp) && step)); |
dfcd3bfb | 2511 | |
fbea99ea | 2512 | /* Decide the set of threads to ask the target to resume. */ |
1946c4cc | 2513 | if (tp->control.trap_expected) |
b0f16a3e SM |
2514 | { |
2515 | /* We're allowing a thread to run past a breakpoint it has | |
1946c4cc YQ |
2516 | hit, either by single-stepping the thread with the breakpoint |
2517 | removed, or by displaced stepping, with the breakpoint inserted. | |
2518 | In the former case, we need to single-step only this thread, | |
2519 | and keep others stopped, as they can miss this breakpoint if | |
2520 | allowed to run. That's not really a problem for displaced | |
2521 | stepping, but, we still keep other threads stopped, in case | |
2522 | another thread is also stopped for a breakpoint waiting for | |
2523 | its turn in the displaced stepping queue. */ | |
b0f16a3e SM |
2524 | resume_ptid = inferior_ptid; |
2525 | } | |
fbea99ea PA |
2526 | else |
2527 | resume_ptid = internal_resume_ptid (user_step); | |
d4db2f36 | 2528 | |
7f5ef605 PA |
2529 | if (execution_direction != EXEC_REVERSE |
2530 | && step && breakpoint_inserted_here_p (aspace, pc)) | |
b0f16a3e | 2531 | { |
372316f1 PA |
2532 | /* There are two cases where we currently need to step a |
2533 | breakpoint instruction when we have a signal to deliver: | |
2534 | ||
2535 | - See handle_signal_stop where we handle random signals that | |
2536 | could take out us out of the stepping range. Normally, in | |
2537 | that case we end up continuing (instead of stepping) over the | |
7f5ef605 PA |
2538 | signal handler with a breakpoint at PC, but there are cases |
2539 | where we should _always_ single-step, even if we have a | |
2540 | step-resume breakpoint, like when a software watchpoint is | |
2541 | set. Assuming single-stepping and delivering a signal at the | |
2542 | same time would takes us to the signal handler, then we could | |
2543 | have removed the breakpoint at PC to step over it. However, | |
2544 | some hardware step targets (like e.g., Mac OS) can't step | |
2545 | into signal handlers, and for those, we need to leave the | |
2546 | breakpoint at PC inserted, as otherwise if the handler | |
2547 | recurses and executes PC again, it'll miss the breakpoint. | |
2548 | So we leave the breakpoint inserted anyway, but we need to | |
2549 | record that we tried to step a breakpoint instruction, so | |
372316f1 PA |
2550 | that adjust_pc_after_break doesn't end up confused. |
2551 | ||
2552 | - In non-stop if we insert a breakpoint (e.g., a step-resume) | |
2553 | in one thread after another thread that was stepping had been | |
2554 | momentarily paused for a step-over. When we re-resume the | |
2555 | stepping thread, it may be resumed from that address with a | |
2556 | breakpoint that hasn't trapped yet. Seen with | |
2557 | gdb.threads/non-stop-fair-events.exp, on targets that don't | |
2558 | do displaced stepping. */ | |
2559 | ||
2560 | if (debug_infrun) | |
2561 | fprintf_unfiltered (gdb_stdlog, | |
2562 | "infrun: resume: [%s] stepped breakpoint\n", | |
a068643d | 2563 | target_pid_to_str (tp->ptid).c_str ()); |
7f5ef605 PA |
2564 | |
2565 | tp->stepped_breakpoint = 1; | |
2566 | ||
b0f16a3e SM |
2567 | /* Most targets can step a breakpoint instruction, thus |
2568 | executing it normally. But if this one cannot, just | |
2569 | continue and we will hit it anyway. */ | |
7f5ef605 | 2570 | if (gdbarch_cannot_step_breakpoint (gdbarch)) |
b0f16a3e SM |
2571 | step = 0; |
2572 | } | |
ef5cf84e | 2573 | |
b0f16a3e | 2574 | if (debug_displaced |
cb71640d | 2575 | && tp->control.trap_expected |
3fc8eb30 | 2576 | && use_displaced_stepping (tp) |
cb71640d | 2577 | && !step_over_info_valid_p ()) |
b0f16a3e | 2578 | { |
00431a78 | 2579 | struct regcache *resume_regcache = get_thread_regcache (tp); |
ac7936df | 2580 | struct gdbarch *resume_gdbarch = resume_regcache->arch (); |
b0f16a3e SM |
2581 | CORE_ADDR actual_pc = regcache_read_pc (resume_regcache); |
2582 | gdb_byte buf[4]; | |
2583 | ||
2584 | fprintf_unfiltered (gdb_stdlog, "displaced: run %s: ", | |
2585 | paddress (resume_gdbarch, actual_pc)); | |
2586 | read_memory (actual_pc, buf, sizeof (buf)); | |
2587 | displaced_step_dump_bytes (gdb_stdlog, buf, sizeof (buf)); | |
2588 | } | |
237fc4c9 | 2589 | |
b0f16a3e SM |
2590 | if (tp->control.may_range_step) |
2591 | { | |
2592 | /* If we're resuming a thread with the PC out of the step | |
2593 | range, then we're doing some nested/finer run control | |
2594 | operation, like stepping the thread out of the dynamic | |
2595 | linker or the displaced stepping scratch pad. We | |
2596 | shouldn't have allowed a range step then. */ | |
2597 | gdb_assert (pc_in_thread_step_range (pc, tp)); | |
2598 | } | |
c1e36e3e | 2599 | |
64ce06e4 | 2600 | do_target_resume (resume_ptid, step, sig); |
372316f1 | 2601 | tp->resumed = 1; |
c906108c | 2602 | } |
71d378ae PA |
2603 | |
2604 | /* Resume the inferior. SIG is the signal to give the inferior | |
2605 | (GDB_SIGNAL_0 for none). This is a wrapper around 'resume_1' that | |
2606 | rolls back state on error. */ | |
2607 | ||
aff4e175 | 2608 | static void |
71d378ae PA |
2609 | resume (gdb_signal sig) |
2610 | { | |
a70b8144 | 2611 | try |
71d378ae PA |
2612 | { |
2613 | resume_1 (sig); | |
2614 | } | |
230d2906 | 2615 | catch (const gdb_exception &ex) |
71d378ae PA |
2616 | { |
2617 | /* If resuming is being aborted for any reason, delete any | |
2618 | single-step breakpoint resume_1 may have created, to avoid | |
2619 | confusing the following resumption, and to avoid leaving | |
2620 | single-step breakpoints perturbing other threads, in case | |
2621 | we're running in non-stop mode. */ | |
2622 | if (inferior_ptid != null_ptid) | |
2623 | delete_single_step_breakpoints (inferior_thread ()); | |
eedc3f4f | 2624 | throw; |
71d378ae | 2625 | } |
71d378ae PA |
2626 | } |
2627 | ||
c906108c | 2628 | \f |
237fc4c9 | 2629 | /* Proceeding. */ |
c906108c | 2630 | |
4c2f2a79 PA |
2631 | /* See infrun.h. */ |
2632 | ||
2633 | /* Counter that tracks number of user visible stops. This can be used | |
2634 | to tell whether a command has proceeded the inferior past the | |
2635 | current location. This allows e.g., inferior function calls in | |
2636 | breakpoint commands to not interrupt the command list. When the | |
2637 | call finishes successfully, the inferior is standing at the same | |
2638 | breakpoint as if nothing happened (and so we don't call | |
2639 | normal_stop). */ | |
2640 | static ULONGEST current_stop_id; | |
2641 | ||
2642 | /* See infrun.h. */ | |
2643 | ||
2644 | ULONGEST | |
2645 | get_stop_id (void) | |
2646 | { | |
2647 | return current_stop_id; | |
2648 | } | |
2649 | ||
2650 | /* Called when we report a user visible stop. */ | |
2651 | ||
2652 | static void | |
2653 | new_stop_id (void) | |
2654 | { | |
2655 | current_stop_id++; | |
2656 | } | |
2657 | ||
c906108c SS |
2658 | /* Clear out all variables saying what to do when inferior is continued. |
2659 | First do this, then set the ones you want, then call `proceed'. */ | |
2660 | ||
a7212384 UW |
2661 | static void |
2662 | clear_proceed_status_thread (struct thread_info *tp) | |
c906108c | 2663 | { |
a7212384 UW |
2664 | if (debug_infrun) |
2665 | fprintf_unfiltered (gdb_stdlog, | |
2666 | "infrun: clear_proceed_status_thread (%s)\n", | |
a068643d | 2667 | target_pid_to_str (tp->ptid).c_str ()); |
d6b48e9c | 2668 | |
372316f1 PA |
2669 | /* If we're starting a new sequence, then the previous finished |
2670 | single-step is no longer relevant. */ | |
2671 | if (tp->suspend.waitstatus_pending_p) | |
2672 | { | |
2673 | if (tp->suspend.stop_reason == TARGET_STOPPED_BY_SINGLE_STEP) | |
2674 | { | |
2675 | if (debug_infrun) | |
2676 | fprintf_unfiltered (gdb_stdlog, | |
2677 | "infrun: clear_proceed_status: pending " | |
2678 | "event of %s was a finished step. " | |
2679 | "Discarding.\n", | |
a068643d | 2680 | target_pid_to_str (tp->ptid).c_str ()); |
372316f1 PA |
2681 | |
2682 | tp->suspend.waitstatus_pending_p = 0; | |
2683 | tp->suspend.stop_reason = TARGET_STOPPED_BY_NO_REASON; | |
2684 | } | |
2685 | else if (debug_infrun) | |
2686 | { | |
23fdd69e SM |
2687 | std::string statstr |
2688 | = target_waitstatus_to_string (&tp->suspend.waitstatus); | |
372316f1 | 2689 | |
372316f1 PA |
2690 | fprintf_unfiltered (gdb_stdlog, |
2691 | "infrun: clear_proceed_status_thread: thread %s " | |
2692 | "has pending wait status %s " | |
2693 | "(currently_stepping=%d).\n", | |
a068643d TT |
2694 | target_pid_to_str (tp->ptid).c_str (), |
2695 | statstr.c_str (), | |
372316f1 | 2696 | currently_stepping (tp)); |
372316f1 PA |
2697 | } |
2698 | } | |
2699 | ||
70509625 PA |
2700 | /* If this signal should not be seen by program, give it zero. |
2701 | Used for debugging signals. */ | |
2702 | if (!signal_pass_state (tp->suspend.stop_signal)) | |
2703 | tp->suspend.stop_signal = GDB_SIGNAL_0; | |
2704 | ||
46e3ed7f | 2705 | delete tp->thread_fsm; |
243a9253 PA |
2706 | tp->thread_fsm = NULL; |
2707 | ||
16c381f0 JK |
2708 | tp->control.trap_expected = 0; |
2709 | tp->control.step_range_start = 0; | |
2710 | tp->control.step_range_end = 0; | |
c1e36e3e | 2711 | tp->control.may_range_step = 0; |
16c381f0 JK |
2712 | tp->control.step_frame_id = null_frame_id; |
2713 | tp->control.step_stack_frame_id = null_frame_id; | |
2714 | tp->control.step_over_calls = STEP_OVER_UNDEBUGGABLE; | |
885eeb5b | 2715 | tp->control.step_start_function = NULL; |
a7212384 | 2716 | tp->stop_requested = 0; |
4e1c45ea | 2717 | |
16c381f0 | 2718 | tp->control.stop_step = 0; |
32400beb | 2719 | |
16c381f0 | 2720 | tp->control.proceed_to_finish = 0; |
414c69f7 | 2721 | |
856e7dd6 | 2722 | tp->control.stepping_command = 0; |
17b2616c | 2723 | |
a7212384 | 2724 | /* Discard any remaining commands or status from previous stop. */ |
16c381f0 | 2725 | bpstat_clear (&tp->control.stop_bpstat); |
a7212384 | 2726 | } |
32400beb | 2727 | |
a7212384 | 2728 | void |
70509625 | 2729 | clear_proceed_status (int step) |
a7212384 | 2730 | { |
f2665db5 MM |
2731 | /* With scheduler-locking replay, stop replaying other threads if we're |
2732 | not replaying the user-visible resume ptid. | |
2733 | ||
2734 | This is a convenience feature to not require the user to explicitly | |
2735 | stop replaying the other threads. We're assuming that the user's | |
2736 | intent is to resume tracing the recorded process. */ | |
2737 | if (!non_stop && scheduler_mode == schedlock_replay | |
2738 | && target_record_is_replaying (minus_one_ptid) | |
2739 | && !target_record_will_replay (user_visible_resume_ptid (step), | |
2740 | execution_direction)) | |
2741 | target_record_stop_replaying (); | |
2742 | ||
08036331 | 2743 | if (!non_stop && inferior_ptid != null_ptid) |
6c95b8df | 2744 | { |
08036331 | 2745 | ptid_t resume_ptid = user_visible_resume_ptid (step); |
70509625 PA |
2746 | |
2747 | /* In all-stop mode, delete the per-thread status of all threads | |
2748 | we're about to resume, implicitly and explicitly. */ | |
08036331 PA |
2749 | for (thread_info *tp : all_non_exited_threads (resume_ptid)) |
2750 | clear_proceed_status_thread (tp); | |
6c95b8df PA |
2751 | } |
2752 | ||
d7e15655 | 2753 | if (inferior_ptid != null_ptid) |
a7212384 UW |
2754 | { |
2755 | struct inferior *inferior; | |
2756 | ||
2757 | if (non_stop) | |
2758 | { | |
6c95b8df PA |
2759 | /* If in non-stop mode, only delete the per-thread status of |
2760 | the current thread. */ | |
a7212384 UW |
2761 | clear_proceed_status_thread (inferior_thread ()); |
2762 | } | |
6c95b8df | 2763 | |
d6b48e9c | 2764 | inferior = current_inferior (); |
16c381f0 | 2765 | inferior->control.stop_soon = NO_STOP_QUIETLY; |
4e1c45ea PA |
2766 | } |
2767 | ||
76727919 | 2768 | gdb::observers::about_to_proceed.notify (); |
c906108c SS |
2769 | } |
2770 | ||
99619bea PA |
2771 | /* Returns true if TP is still stopped at a breakpoint that needs |
2772 | stepping-over in order to make progress. If the breakpoint is gone | |
2773 | meanwhile, we can skip the whole step-over dance. */ | |
ea67f13b DJ |
2774 | |
2775 | static int | |
6c4cfb24 | 2776 | thread_still_needs_step_over_bp (struct thread_info *tp) |
99619bea PA |
2777 | { |
2778 | if (tp->stepping_over_breakpoint) | |
2779 | { | |
00431a78 | 2780 | struct regcache *regcache = get_thread_regcache (tp); |
99619bea | 2781 | |
a01bda52 | 2782 | if (breakpoint_here_p (regcache->aspace (), |
af48d08f PA |
2783 | regcache_read_pc (regcache)) |
2784 | == ordinary_breakpoint_here) | |
99619bea PA |
2785 | return 1; |
2786 | ||
2787 | tp->stepping_over_breakpoint = 0; | |
2788 | } | |
2789 | ||
2790 | return 0; | |
2791 | } | |
2792 | ||
6c4cfb24 PA |
2793 | /* Check whether thread TP still needs to start a step-over in order |
2794 | to make progress when resumed. Returns an bitwise or of enum | |
2795 | step_over_what bits, indicating what needs to be stepped over. */ | |
2796 | ||
8d297bbf | 2797 | static step_over_what |
6c4cfb24 PA |
2798 | thread_still_needs_step_over (struct thread_info *tp) |
2799 | { | |
8d297bbf | 2800 | step_over_what what = 0; |
6c4cfb24 PA |
2801 | |
2802 | if (thread_still_needs_step_over_bp (tp)) | |
2803 | what |= STEP_OVER_BREAKPOINT; | |
2804 | ||
2805 | if (tp->stepping_over_watchpoint | |
2806 | && !target_have_steppable_watchpoint) | |
2807 | what |= STEP_OVER_WATCHPOINT; | |
2808 | ||
2809 | return what; | |
2810 | } | |
2811 | ||
483805cf PA |
2812 | /* Returns true if scheduler locking applies. STEP indicates whether |
2813 | we're about to do a step/next-like command to a thread. */ | |
2814 | ||
2815 | static int | |
856e7dd6 | 2816 | schedlock_applies (struct thread_info *tp) |
483805cf PA |
2817 | { |
2818 | return (scheduler_mode == schedlock_on | |
2819 | || (scheduler_mode == schedlock_step | |
f2665db5 MM |
2820 | && tp->control.stepping_command) |
2821 | || (scheduler_mode == schedlock_replay | |
2822 | && target_record_will_replay (minus_one_ptid, | |
2823 | execution_direction))); | |
483805cf PA |
2824 | } |
2825 | ||
c906108c SS |
2826 | /* Basic routine for continuing the program in various fashions. |
2827 | ||
2828 | ADDR is the address to resume at, or -1 for resume where stopped. | |
aff4e175 AB |
2829 | SIGGNAL is the signal to give it, or GDB_SIGNAL_0 for none, |
2830 | or GDB_SIGNAL_DEFAULT for act according to how it stopped. | |
c906108c SS |
2831 | |
2832 | You should call clear_proceed_status before calling proceed. */ | |
2833 | ||
2834 | void | |
64ce06e4 | 2835 | proceed (CORE_ADDR addr, enum gdb_signal siggnal) |
c906108c | 2836 | { |
e58b0e63 PA |
2837 | struct regcache *regcache; |
2838 | struct gdbarch *gdbarch; | |
e58b0e63 | 2839 | CORE_ADDR pc; |
4d9d9d04 PA |
2840 | ptid_t resume_ptid; |
2841 | struct execution_control_state ecss; | |
2842 | struct execution_control_state *ecs = &ecss; | |
4d9d9d04 | 2843 | int started; |
c906108c | 2844 | |
e58b0e63 PA |
2845 | /* If we're stopped at a fork/vfork, follow the branch set by the |
2846 | "set follow-fork-mode" command; otherwise, we'll just proceed | |
2847 | resuming the current thread. */ | |
2848 | if (!follow_fork ()) | |
2849 | { | |
2850 | /* The target for some reason decided not to resume. */ | |
2851 | normal_stop (); | |
f148b27e PA |
2852 | if (target_can_async_p ()) |
2853 | inferior_event_handler (INF_EXEC_COMPLETE, NULL); | |
e58b0e63 PA |
2854 | return; |
2855 | } | |
2856 | ||
842951eb PA |
2857 | /* We'll update this if & when we switch to a new thread. */ |
2858 | previous_inferior_ptid = inferior_ptid; | |
2859 | ||
e58b0e63 | 2860 | regcache = get_current_regcache (); |
ac7936df | 2861 | gdbarch = regcache->arch (); |
8b86c959 YQ |
2862 | const address_space *aspace = regcache->aspace (); |
2863 | ||
e58b0e63 | 2864 | pc = regcache_read_pc (regcache); |
08036331 | 2865 | thread_info *cur_thr = inferior_thread (); |
e58b0e63 | 2866 | |
99619bea | 2867 | /* Fill in with reasonable starting values. */ |
08036331 | 2868 | init_thread_stepping_state (cur_thr); |
99619bea | 2869 | |
08036331 | 2870 | gdb_assert (!thread_is_in_step_over_chain (cur_thr)); |
c2829269 | 2871 | |
2acceee2 | 2872 | if (addr == (CORE_ADDR) -1) |
c906108c | 2873 | { |
08036331 | 2874 | if (pc == cur_thr->suspend.stop_pc |
af48d08f | 2875 | && breakpoint_here_p (aspace, pc) == ordinary_breakpoint_here |
b2175913 | 2876 | && execution_direction != EXEC_REVERSE) |
3352ef37 AC |
2877 | /* There is a breakpoint at the address we will resume at, |
2878 | step one instruction before inserting breakpoints so that | |
2879 | we do not stop right away (and report a second hit at this | |
b2175913 MS |
2880 | breakpoint). |
2881 | ||
2882 | Note, we don't do this in reverse, because we won't | |
2883 | actually be executing the breakpoint insn anyway. | |
2884 | We'll be (un-)executing the previous instruction. */ | |
08036331 | 2885 | cur_thr->stepping_over_breakpoint = 1; |
515630c5 UW |
2886 | else if (gdbarch_single_step_through_delay_p (gdbarch) |
2887 | && gdbarch_single_step_through_delay (gdbarch, | |
2888 | get_current_frame ())) | |
3352ef37 AC |
2889 | /* We stepped onto an instruction that needs to be stepped |
2890 | again before re-inserting the breakpoint, do so. */ | |
08036331 | 2891 | cur_thr->stepping_over_breakpoint = 1; |
c906108c SS |
2892 | } |
2893 | else | |
2894 | { | |
515630c5 | 2895 | regcache_write_pc (regcache, addr); |
c906108c SS |
2896 | } |
2897 | ||
70509625 | 2898 | if (siggnal != GDB_SIGNAL_DEFAULT) |
08036331 | 2899 | cur_thr->suspend.stop_signal = siggnal; |
70509625 | 2900 | |
08036331 | 2901 | resume_ptid = user_visible_resume_ptid (cur_thr->control.stepping_command); |
4d9d9d04 PA |
2902 | |
2903 | /* If an exception is thrown from this point on, make sure to | |
2904 | propagate GDB's knowledge of the executing state to the | |
2905 | frontend/user running state. */ | |
731f534f | 2906 | scoped_finish_thread_state finish_state (resume_ptid); |
4d9d9d04 PA |
2907 | |
2908 | /* Even if RESUME_PTID is a wildcard, and we end up resuming fewer | |
2909 | threads (e.g., we might need to set threads stepping over | |
2910 | breakpoints first), from the user/frontend's point of view, all | |
2911 | threads in RESUME_PTID are now running. Unless we're calling an | |
2912 | inferior function, as in that case we pretend the inferior | |
2913 | doesn't run at all. */ | |
08036331 | 2914 | if (!cur_thr->control.in_infcall) |
4d9d9d04 | 2915 | set_running (resume_ptid, 1); |
17b2616c | 2916 | |
527159b7 | 2917 | if (debug_infrun) |
8a9de0e4 | 2918 | fprintf_unfiltered (gdb_stdlog, |
64ce06e4 | 2919 | "infrun: proceed (addr=%s, signal=%s)\n", |
c9737c08 | 2920 | paddress (gdbarch, addr), |
64ce06e4 | 2921 | gdb_signal_to_symbol_string (siggnal)); |
527159b7 | 2922 | |
4d9d9d04 PA |
2923 | annotate_starting (); |
2924 | ||
2925 | /* Make sure that output from GDB appears before output from the | |
2926 | inferior. */ | |
2927 | gdb_flush (gdb_stdout); | |
2928 | ||
d930703d PA |
2929 | /* Since we've marked the inferior running, give it the terminal. A |
2930 | QUIT/Ctrl-C from here on is forwarded to the target (which can | |
2931 | still detect attempts to unblock a stuck connection with repeated | |
2932 | Ctrl-C from within target_pass_ctrlc). */ | |
2933 | target_terminal::inferior (); | |
2934 | ||
4d9d9d04 PA |
2935 | /* In a multi-threaded task we may select another thread and |
2936 | then continue or step. | |
2937 | ||
2938 | But if a thread that we're resuming had stopped at a breakpoint, | |
2939 | it will immediately cause another breakpoint stop without any | |
2940 | execution (i.e. it will report a breakpoint hit incorrectly). So | |
2941 | we must step over it first. | |
2942 | ||
2943 | Look for threads other than the current (TP) that reported a | |
2944 | breakpoint hit and haven't been resumed yet since. */ | |
2945 | ||
2946 | /* If scheduler locking applies, we can avoid iterating over all | |
2947 | threads. */ | |
08036331 | 2948 | if (!non_stop && !schedlock_applies (cur_thr)) |
94cc34af | 2949 | { |
08036331 PA |
2950 | for (thread_info *tp : all_non_exited_threads (resume_ptid)) |
2951 | { | |
4d9d9d04 PA |
2952 | /* Ignore the current thread here. It's handled |
2953 | afterwards. */ | |
08036331 | 2954 | if (tp == cur_thr) |
4d9d9d04 | 2955 | continue; |
c906108c | 2956 | |
4d9d9d04 PA |
2957 | if (!thread_still_needs_step_over (tp)) |
2958 | continue; | |
2959 | ||
2960 | gdb_assert (!thread_is_in_step_over_chain (tp)); | |
c906108c | 2961 | |
99619bea PA |
2962 | if (debug_infrun) |
2963 | fprintf_unfiltered (gdb_stdlog, | |
2964 | "infrun: need to step-over [%s] first\n", | |
a068643d | 2965 | target_pid_to_str (tp->ptid).c_str ()); |
99619bea | 2966 | |
4d9d9d04 | 2967 | thread_step_over_chain_enqueue (tp); |
2adfaa28 | 2968 | } |
30852783 UW |
2969 | } |
2970 | ||
4d9d9d04 PA |
2971 | /* Enqueue the current thread last, so that we move all other |
2972 | threads over their breakpoints first. */ | |
08036331 PA |
2973 | if (cur_thr->stepping_over_breakpoint) |
2974 | thread_step_over_chain_enqueue (cur_thr); | |
30852783 | 2975 | |
4d9d9d04 PA |
2976 | /* If the thread isn't started, we'll still need to set its prev_pc, |
2977 | so that switch_back_to_stepped_thread knows the thread hasn't | |
2978 | advanced. Must do this before resuming any thread, as in | |
2979 | all-stop/remote, once we resume we can't send any other packet | |
2980 | until the target stops again. */ | |
08036331 | 2981 | cur_thr->prev_pc = regcache_read_pc (regcache); |
99619bea | 2982 | |
a9bc57b9 TT |
2983 | { |
2984 | scoped_restore save_defer_tc = make_scoped_defer_target_commit_resume (); | |
85ad3aaf | 2985 | |
a9bc57b9 | 2986 | started = start_step_over (); |
c906108c | 2987 | |
a9bc57b9 TT |
2988 | if (step_over_info_valid_p ()) |
2989 | { | |
2990 | /* Either this thread started a new in-line step over, or some | |
2991 | other thread was already doing one. In either case, don't | |
2992 | resume anything else until the step-over is finished. */ | |
2993 | } | |
2994 | else if (started && !target_is_non_stop_p ()) | |
2995 | { | |
2996 | /* A new displaced stepping sequence was started. In all-stop, | |
2997 | we can't talk to the target anymore until it next stops. */ | |
2998 | } | |
2999 | else if (!non_stop && target_is_non_stop_p ()) | |
3000 | { | |
3001 | /* In all-stop, but the target is always in non-stop mode. | |
3002 | Start all other threads that are implicitly resumed too. */ | |
08036331 | 3003 | for (thread_info *tp : all_non_exited_threads (resume_ptid)) |
fbea99ea | 3004 | { |
fbea99ea PA |
3005 | if (tp->resumed) |
3006 | { | |
3007 | if (debug_infrun) | |
3008 | fprintf_unfiltered (gdb_stdlog, | |
3009 | "infrun: proceed: [%s] resumed\n", | |
a068643d | 3010 | target_pid_to_str (tp->ptid).c_str ()); |
fbea99ea PA |
3011 | gdb_assert (tp->executing || tp->suspend.waitstatus_pending_p); |
3012 | continue; | |
3013 | } | |
3014 | ||
3015 | if (thread_is_in_step_over_chain (tp)) | |
3016 | { | |
3017 | if (debug_infrun) | |
3018 | fprintf_unfiltered (gdb_stdlog, | |
3019 | "infrun: proceed: [%s] needs step-over\n", | |
a068643d | 3020 | target_pid_to_str (tp->ptid).c_str ()); |
fbea99ea PA |
3021 | continue; |
3022 | } | |
3023 | ||
3024 | if (debug_infrun) | |
3025 | fprintf_unfiltered (gdb_stdlog, | |
3026 | "infrun: proceed: resuming %s\n", | |
a068643d | 3027 | target_pid_to_str (tp->ptid).c_str ()); |
fbea99ea PA |
3028 | |
3029 | reset_ecs (ecs, tp); | |
00431a78 | 3030 | switch_to_thread (tp); |
fbea99ea PA |
3031 | keep_going_pass_signal (ecs); |
3032 | if (!ecs->wait_some_more) | |
fd7dcb94 | 3033 | error (_("Command aborted.")); |
fbea99ea | 3034 | } |
a9bc57b9 | 3035 | } |
08036331 | 3036 | else if (!cur_thr->resumed && !thread_is_in_step_over_chain (cur_thr)) |
a9bc57b9 TT |
3037 | { |
3038 | /* The thread wasn't started, and isn't queued, run it now. */ | |
08036331 PA |
3039 | reset_ecs (ecs, cur_thr); |
3040 | switch_to_thread (cur_thr); | |
a9bc57b9 TT |
3041 | keep_going_pass_signal (ecs); |
3042 | if (!ecs->wait_some_more) | |
3043 | error (_("Command aborted.")); | |
3044 | } | |
3045 | } | |
c906108c | 3046 | |
85ad3aaf PA |
3047 | target_commit_resume (); |
3048 | ||
731f534f | 3049 | finish_state.release (); |
c906108c | 3050 | |
0b333c5e PA |
3051 | /* Tell the event loop to wait for it to stop. If the target |
3052 | supports asynchronous execution, it'll do this from within | |
3053 | target_resume. */ | |
362646f5 | 3054 | if (!target_can_async_p ()) |
0b333c5e | 3055 | mark_async_event_handler (infrun_async_inferior_event_token); |
c906108c | 3056 | } |
c906108c SS |
3057 | \f |
3058 | ||
3059 | /* Start remote-debugging of a machine over a serial link. */ | |
96baa820 | 3060 | |
c906108c | 3061 | void |
8621d6a9 | 3062 | start_remote (int from_tty) |
c906108c | 3063 | { |
d6b48e9c | 3064 | struct inferior *inferior; |
d6b48e9c PA |
3065 | |
3066 | inferior = current_inferior (); | |
16c381f0 | 3067 | inferior->control.stop_soon = STOP_QUIETLY_REMOTE; |
43ff13b4 | 3068 | |
1777feb0 | 3069 | /* Always go on waiting for the target, regardless of the mode. */ |
6426a772 | 3070 | /* FIXME: cagney/1999-09-23: At present it isn't possible to |
7e73cedf | 3071 | indicate to wait_for_inferior that a target should timeout if |
6426a772 JM |
3072 | nothing is returned (instead of just blocking). Because of this, |
3073 | targets expecting an immediate response need to, internally, set | |
3074 | things up so that the target_wait() is forced to eventually | |
1777feb0 | 3075 | timeout. */ |
6426a772 JM |
3076 | /* FIXME: cagney/1999-09-24: It isn't possible for target_open() to |
3077 | differentiate to its caller what the state of the target is after | |
3078 | the initial open has been performed. Here we're assuming that | |
3079 | the target has stopped. It should be possible to eventually have | |
3080 | target_open() return to the caller an indication that the target | |
3081 | is currently running and GDB state should be set to the same as | |
1777feb0 | 3082 | for an async run. */ |
e4c8541f | 3083 | wait_for_inferior (); |
8621d6a9 DJ |
3084 | |
3085 | /* Now that the inferior has stopped, do any bookkeeping like | |
3086 | loading shared libraries. We want to do this before normal_stop, | |
3087 | so that the displayed frame is up to date. */ | |
8b88a78e | 3088 | post_create_inferior (current_top_target (), from_tty); |
8621d6a9 | 3089 | |
6426a772 | 3090 | normal_stop (); |
c906108c SS |
3091 | } |
3092 | ||
3093 | /* Initialize static vars when a new inferior begins. */ | |
3094 | ||
3095 | void | |
96baa820 | 3096 | init_wait_for_inferior (void) |
c906108c SS |
3097 | { |
3098 | /* These are meaningless until the first time through wait_for_inferior. */ | |
c906108c | 3099 | |
c906108c SS |
3100 | breakpoint_init_inferior (inf_starting); |
3101 | ||
70509625 | 3102 | clear_proceed_status (0); |
9f976b41 | 3103 | |
ca005067 | 3104 | target_last_wait_ptid = minus_one_ptid; |
237fc4c9 | 3105 | |
842951eb | 3106 | previous_inferior_ptid = inferior_ptid; |
c906108c | 3107 | } |
237fc4c9 | 3108 | |
c906108c | 3109 | \f |
488f131b | 3110 | |
ec9499be | 3111 | static void handle_inferior_event (struct execution_control_state *ecs); |
cd0fc7c3 | 3112 | |
568d6575 UW |
3113 | static void handle_step_into_function (struct gdbarch *gdbarch, |
3114 | struct execution_control_state *ecs); | |
3115 | static void handle_step_into_function_backward (struct gdbarch *gdbarch, | |
3116 | struct execution_control_state *ecs); | |
4f5d7f63 | 3117 | static void handle_signal_stop (struct execution_control_state *ecs); |
186c406b | 3118 | static void check_exception_resume (struct execution_control_state *, |
28106bc2 | 3119 | struct frame_info *); |
611c83ae | 3120 | |
bdc36728 | 3121 | static void end_stepping_range (struct execution_control_state *ecs); |
22bcd14b | 3122 | static void stop_waiting (struct execution_control_state *ecs); |
d4f3574e | 3123 | static void keep_going (struct execution_control_state *ecs); |
94c57d6a | 3124 | static void process_event_stop_test (struct execution_control_state *ecs); |
c447ac0b | 3125 | static int switch_back_to_stepped_thread (struct execution_control_state *ecs); |
104c1213 | 3126 | |
252fbfc8 PA |
3127 | /* This function is attached as a "thread_stop_requested" observer. |
3128 | Cleanup local state that assumed the PTID was to be resumed, and | |
3129 | report the stop to the frontend. */ | |
3130 | ||
2c0b251b | 3131 | static void |
252fbfc8 PA |
3132 | infrun_thread_stop_requested (ptid_t ptid) |
3133 | { | |
c65d6b55 PA |
3134 | /* PTID was requested to stop. If the thread was already stopped, |
3135 | but the user/frontend doesn't know about that yet (e.g., the | |
3136 | thread had been temporarily paused for some step-over), set up | |
3137 | for reporting the stop now. */ | |
08036331 PA |
3138 | for (thread_info *tp : all_threads (ptid)) |
3139 | { | |
3140 | if (tp->state != THREAD_RUNNING) | |
3141 | continue; | |
3142 | if (tp->executing) | |
3143 | continue; | |
c65d6b55 | 3144 | |
08036331 PA |
3145 | /* Remove matching threads from the step-over queue, so |
3146 | start_step_over doesn't try to resume them | |
3147 | automatically. */ | |
3148 | if (thread_is_in_step_over_chain (tp)) | |
3149 | thread_step_over_chain_remove (tp); | |
c65d6b55 | 3150 | |
08036331 PA |
3151 | /* If the thread is stopped, but the user/frontend doesn't |
3152 | know about that yet, queue a pending event, as if the | |
3153 | thread had just stopped now. Unless the thread already had | |
3154 | a pending event. */ | |
3155 | if (!tp->suspend.waitstatus_pending_p) | |
3156 | { | |
3157 | tp->suspend.waitstatus_pending_p = 1; | |
3158 | tp->suspend.waitstatus.kind = TARGET_WAITKIND_STOPPED; | |
3159 | tp->suspend.waitstatus.value.sig = GDB_SIGNAL_0; | |
3160 | } | |
c65d6b55 | 3161 | |
08036331 PA |
3162 | /* Clear the inline-frame state, since we're re-processing the |
3163 | stop. */ | |
3164 | clear_inline_frame_state (tp->ptid); | |
c65d6b55 | 3165 | |
08036331 PA |
3166 | /* If this thread was paused because some other thread was |
3167 | doing an inline-step over, let that finish first. Once | |
3168 | that happens, we'll restart all threads and consume pending | |
3169 | stop events then. */ | |
3170 | if (step_over_info_valid_p ()) | |
3171 | continue; | |
3172 | ||
3173 | /* Otherwise we can process the (new) pending event now. Set | |
3174 | it so this pending event is considered by | |
3175 | do_target_wait. */ | |
3176 | tp->resumed = 1; | |
3177 | } | |
252fbfc8 PA |
3178 | } |
3179 | ||
a07daef3 PA |
3180 | static void |
3181 | infrun_thread_thread_exit (struct thread_info *tp, int silent) | |
3182 | { | |
d7e15655 | 3183 | if (target_last_wait_ptid == tp->ptid) |
a07daef3 PA |
3184 | nullify_last_target_wait_ptid (); |
3185 | } | |
3186 | ||
0cbcdb96 PA |
3187 | /* Delete the step resume, single-step and longjmp/exception resume |
3188 | breakpoints of TP. */ | |
4e1c45ea | 3189 | |
0cbcdb96 PA |
3190 | static void |
3191 | delete_thread_infrun_breakpoints (struct thread_info *tp) | |
4e1c45ea | 3192 | { |
0cbcdb96 PA |
3193 | delete_step_resume_breakpoint (tp); |
3194 | delete_exception_resume_breakpoint (tp); | |
34b7e8a6 | 3195 | delete_single_step_breakpoints (tp); |
4e1c45ea PA |
3196 | } |
3197 | ||
0cbcdb96 PA |
3198 | /* If the target still has execution, call FUNC for each thread that |
3199 | just stopped. In all-stop, that's all the non-exited threads; in | |
3200 | non-stop, that's the current thread, only. */ | |
3201 | ||
3202 | typedef void (*for_each_just_stopped_thread_callback_func) | |
3203 | (struct thread_info *tp); | |
4e1c45ea PA |
3204 | |
3205 | static void | |
0cbcdb96 | 3206 | for_each_just_stopped_thread (for_each_just_stopped_thread_callback_func func) |
4e1c45ea | 3207 | { |
d7e15655 | 3208 | if (!target_has_execution || inferior_ptid == null_ptid) |
4e1c45ea PA |
3209 | return; |
3210 | ||
fbea99ea | 3211 | if (target_is_non_stop_p ()) |
4e1c45ea | 3212 | { |
0cbcdb96 PA |
3213 | /* If in non-stop mode, only the current thread stopped. */ |
3214 | func (inferior_thread ()); | |
4e1c45ea PA |
3215 | } |
3216 | else | |
0cbcdb96 | 3217 | { |
0cbcdb96 | 3218 | /* In all-stop mode, all threads have stopped. */ |
08036331 PA |
3219 | for (thread_info *tp : all_non_exited_threads ()) |
3220 | func (tp); | |
0cbcdb96 PA |
3221 | } |
3222 | } | |
3223 | ||
3224 | /* Delete the step resume and longjmp/exception resume breakpoints of | |
3225 | the threads that just stopped. */ | |
3226 | ||
3227 | static void | |
3228 | delete_just_stopped_threads_infrun_breakpoints (void) | |
3229 | { | |
3230 | for_each_just_stopped_thread (delete_thread_infrun_breakpoints); | |
34b7e8a6 PA |
3231 | } |
3232 | ||
3233 | /* Delete the single-step breakpoints of the threads that just | |
3234 | stopped. */ | |
7c16b83e | 3235 | |
34b7e8a6 PA |
3236 | static void |
3237 | delete_just_stopped_threads_single_step_breakpoints (void) | |
3238 | { | |
3239 | for_each_just_stopped_thread (delete_single_step_breakpoints); | |
4e1c45ea PA |
3240 | } |
3241 | ||
221e1a37 | 3242 | /* See infrun.h. */ |
223698f8 | 3243 | |
221e1a37 | 3244 | void |
223698f8 DE |
3245 | print_target_wait_results (ptid_t waiton_ptid, ptid_t result_ptid, |
3246 | const struct target_waitstatus *ws) | |
3247 | { | |
23fdd69e | 3248 | std::string status_string = target_waitstatus_to_string (ws); |
d7e74731 | 3249 | string_file stb; |
223698f8 DE |
3250 | |
3251 | /* The text is split over several lines because it was getting too long. | |
3252 | Call fprintf_unfiltered (gdb_stdlog) once so that the text is still | |
3253 | output as a unit; we want only one timestamp printed if debug_timestamp | |
3254 | is set. */ | |
3255 | ||
d7e74731 | 3256 | stb.printf ("infrun: target_wait (%d.%ld.%ld", |
e99b03dc | 3257 | waiton_ptid.pid (), |
e38504b3 | 3258 | waiton_ptid.lwp (), |
cc6bcb54 | 3259 | waiton_ptid.tid ()); |
e99b03dc | 3260 | if (waiton_ptid.pid () != -1) |
a068643d | 3261 | stb.printf (" [%s]", target_pid_to_str (waiton_ptid).c_str ()); |
d7e74731 PA |
3262 | stb.printf (", status) =\n"); |
3263 | stb.printf ("infrun: %d.%ld.%ld [%s],\n", | |
e99b03dc | 3264 | result_ptid.pid (), |
e38504b3 | 3265 | result_ptid.lwp (), |
cc6bcb54 | 3266 | result_ptid.tid (), |
a068643d | 3267 | target_pid_to_str (result_ptid).c_str ()); |
23fdd69e | 3268 | stb.printf ("infrun: %s\n", status_string.c_str ()); |
223698f8 DE |
3269 | |
3270 | /* This uses %s in part to handle %'s in the text, but also to avoid | |
3271 | a gcc error: the format attribute requires a string literal. */ | |
d7e74731 | 3272 | fprintf_unfiltered (gdb_stdlog, "%s", stb.c_str ()); |
223698f8 DE |
3273 | } |
3274 | ||
372316f1 PA |
3275 | /* Select a thread at random, out of those which are resumed and have |
3276 | had events. */ | |
3277 | ||
3278 | static struct thread_info * | |
3279 | random_pending_event_thread (ptid_t waiton_ptid) | |
3280 | { | |
372316f1 | 3281 | int num_events = 0; |
08036331 PA |
3282 | |
3283 | auto has_event = [] (thread_info *tp) | |
3284 | { | |
3285 | return (tp->resumed | |
3286 | && tp->suspend.waitstatus_pending_p); | |
3287 | }; | |
372316f1 PA |
3288 | |
3289 | /* First see how many events we have. Count only resumed threads | |
3290 | that have an event pending. */ | |
08036331 PA |
3291 | for (thread_info *tp : all_non_exited_threads (waiton_ptid)) |
3292 | if (has_event (tp)) | |
372316f1 PA |
3293 | num_events++; |
3294 | ||
3295 | if (num_events == 0) | |
3296 | return NULL; | |
3297 | ||
3298 | /* Now randomly pick a thread out of those that have had events. */ | |
08036331 PA |
3299 | int random_selector = (int) ((num_events * (double) rand ()) |
3300 | / (RAND_MAX + 1.0)); | |
372316f1 PA |
3301 | |
3302 | if (debug_infrun && num_events > 1) | |
3303 | fprintf_unfiltered (gdb_stdlog, | |
3304 | "infrun: Found %d events, selecting #%d\n", | |
3305 | num_events, random_selector); | |
3306 | ||
3307 | /* Select the Nth thread that has had an event. */ | |
08036331 PA |
3308 | for (thread_info *tp : all_non_exited_threads (waiton_ptid)) |
3309 | if (has_event (tp)) | |
372316f1 | 3310 | if (random_selector-- == 0) |
08036331 | 3311 | return tp; |
372316f1 | 3312 | |
08036331 | 3313 | gdb_assert_not_reached ("event thread not found"); |
372316f1 PA |
3314 | } |
3315 | ||
3316 | /* Wrapper for target_wait that first checks whether threads have | |
3317 | pending statuses to report before actually asking the target for | |
3318 | more events. */ | |
3319 | ||
3320 | static ptid_t | |
3321 | do_target_wait (ptid_t ptid, struct target_waitstatus *status, int options) | |
3322 | { | |
3323 | ptid_t event_ptid; | |
3324 | struct thread_info *tp; | |
3325 | ||
3326 | /* First check if there is a resumed thread with a wait status | |
3327 | pending. */ | |
d7e15655 | 3328 | if (ptid == minus_one_ptid || ptid.is_pid ()) |
372316f1 PA |
3329 | { |
3330 | tp = random_pending_event_thread (ptid); | |
3331 | } | |
3332 | else | |
3333 | { | |
3334 | if (debug_infrun) | |
3335 | fprintf_unfiltered (gdb_stdlog, | |
3336 | "infrun: Waiting for specific thread %s.\n", | |
a068643d | 3337 | target_pid_to_str (ptid).c_str ()); |
372316f1 PA |
3338 | |
3339 | /* We have a specific thread to check. */ | |
3340 | tp = find_thread_ptid (ptid); | |
3341 | gdb_assert (tp != NULL); | |
3342 | if (!tp->suspend.waitstatus_pending_p) | |
3343 | tp = NULL; | |
3344 | } | |
3345 | ||
3346 | if (tp != NULL | |
3347 | && (tp->suspend.stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT | |
3348 | || tp->suspend.stop_reason == TARGET_STOPPED_BY_HW_BREAKPOINT)) | |
3349 | { | |
00431a78 | 3350 | struct regcache *regcache = get_thread_regcache (tp); |
ac7936df | 3351 | struct gdbarch *gdbarch = regcache->arch (); |
372316f1 PA |
3352 | CORE_ADDR pc; |
3353 | int discard = 0; | |
3354 | ||
3355 | pc = regcache_read_pc (regcache); | |
3356 | ||
3357 | if (pc != tp->suspend.stop_pc) | |
3358 | { | |
3359 | if (debug_infrun) | |
3360 | fprintf_unfiltered (gdb_stdlog, | |
3361 | "infrun: PC of %s changed. was=%s, now=%s\n", | |
a068643d | 3362 | target_pid_to_str (tp->ptid).c_str (), |
defd2172 | 3363 | paddress (gdbarch, tp->suspend.stop_pc), |
372316f1 PA |
3364 | paddress (gdbarch, pc)); |
3365 | discard = 1; | |
3366 | } | |
a01bda52 | 3367 | else if (!breakpoint_inserted_here_p (regcache->aspace (), pc)) |
372316f1 PA |
3368 | { |
3369 | if (debug_infrun) | |
3370 | fprintf_unfiltered (gdb_stdlog, | |
3371 | "infrun: previous breakpoint of %s, at %s gone\n", | |
a068643d | 3372 | target_pid_to_str (tp->ptid).c_str (), |
372316f1 PA |
3373 | paddress (gdbarch, pc)); |
3374 | ||
3375 | discard = 1; | |
3376 | } | |
3377 | ||
3378 | if (discard) | |
3379 | { | |
3380 | if (debug_infrun) | |
3381 | fprintf_unfiltered (gdb_stdlog, | |
3382 | "infrun: pending event of %s cancelled.\n", | |
a068643d | 3383 | target_pid_to_str (tp->ptid).c_str ()); |
372316f1 PA |
3384 | |
3385 | tp->suspend.waitstatus.kind = TARGET_WAITKIND_SPURIOUS; | |
3386 | tp->suspend.stop_reason = TARGET_STOPPED_BY_NO_REASON; | |
3387 | } | |
3388 | } | |
3389 | ||
3390 | if (tp != NULL) | |
3391 | { | |
3392 | if (debug_infrun) | |
3393 | { | |
23fdd69e SM |
3394 | std::string statstr |
3395 | = target_waitstatus_to_string (&tp->suspend.waitstatus); | |
372316f1 | 3396 | |
372316f1 PA |
3397 | fprintf_unfiltered (gdb_stdlog, |
3398 | "infrun: Using pending wait status %s for %s.\n", | |
23fdd69e | 3399 | statstr.c_str (), |
a068643d | 3400 | target_pid_to_str (tp->ptid).c_str ()); |
372316f1 PA |
3401 | } |
3402 | ||
3403 | /* Now that we've selected our final event LWP, un-adjust its PC | |
3404 | if it was a software breakpoint (and the target doesn't | |
3405 | always adjust the PC itself). */ | |
3406 | if (tp->suspend.stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT | |
3407 | && !target_supports_stopped_by_sw_breakpoint ()) | |
3408 | { | |
3409 | struct regcache *regcache; | |
3410 | struct gdbarch *gdbarch; | |
3411 | int decr_pc; | |
3412 | ||
00431a78 | 3413 | regcache = get_thread_regcache (tp); |
ac7936df | 3414 | gdbarch = regcache->arch (); |
372316f1 PA |
3415 | |
3416 | decr_pc = gdbarch_decr_pc_after_break (gdbarch); | |
3417 | if (decr_pc != 0) | |
3418 | { | |
3419 | CORE_ADDR pc; | |
3420 | ||
3421 | pc = regcache_read_pc (regcache); | |
3422 | regcache_write_pc (regcache, pc + decr_pc); | |
3423 | } | |
3424 | } | |
3425 | ||
3426 | tp->suspend.stop_reason = TARGET_STOPPED_BY_NO_REASON; | |
3427 | *status = tp->suspend.waitstatus; | |
3428 | tp->suspend.waitstatus_pending_p = 0; | |
3429 | ||
3430 | /* Wake up the event loop again, until all pending events are | |
3431 | processed. */ | |
3432 | if (target_is_async_p ()) | |
3433 | mark_async_event_handler (infrun_async_inferior_event_token); | |
3434 | return tp->ptid; | |
3435 | } | |
3436 | ||
3437 | /* But if we don't find one, we'll have to wait. */ | |
3438 | ||
3439 | if (deprecated_target_wait_hook) | |
3440 | event_ptid = deprecated_target_wait_hook (ptid, status, options); | |
3441 | else | |
3442 | event_ptid = target_wait (ptid, status, options); | |
3443 | ||
3444 | return event_ptid; | |
3445 | } | |
3446 | ||
24291992 PA |
3447 | /* Prepare and stabilize the inferior for detaching it. E.g., |
3448 | detaching while a thread is displaced stepping is a recipe for | |
3449 | crashing it, as nothing would readjust the PC out of the scratch | |
3450 | pad. */ | |
3451 | ||
3452 | void | |
3453 | prepare_for_detach (void) | |
3454 | { | |
3455 | struct inferior *inf = current_inferior (); | |
f2907e49 | 3456 | ptid_t pid_ptid = ptid_t (inf->pid); |
24291992 | 3457 | |
00431a78 | 3458 | displaced_step_inferior_state *displaced = get_displaced_stepping_state (inf); |
24291992 PA |
3459 | |
3460 | /* Is any thread of this process displaced stepping? If not, | |
3461 | there's nothing else to do. */ | |
d20172fc | 3462 | if (displaced->step_thread == nullptr) |
24291992 PA |
3463 | return; |
3464 | ||
3465 | if (debug_infrun) | |
3466 | fprintf_unfiltered (gdb_stdlog, | |
3467 | "displaced-stepping in-process while detaching"); | |
3468 | ||
9bcb1f16 | 3469 | scoped_restore restore_detaching = make_scoped_restore (&inf->detaching, true); |
24291992 | 3470 | |
00431a78 | 3471 | while (displaced->step_thread != nullptr) |
24291992 | 3472 | { |
24291992 PA |
3473 | struct execution_control_state ecss; |
3474 | struct execution_control_state *ecs; | |
3475 | ||
3476 | ecs = &ecss; | |
3477 | memset (ecs, 0, sizeof (*ecs)); | |
3478 | ||
3479 | overlay_cache_invalid = 1; | |
f15cb84a YQ |
3480 | /* Flush target cache before starting to handle each event. |
3481 | Target was running and cache could be stale. This is just a | |
3482 | heuristic. Running threads may modify target memory, but we | |
3483 | don't get any event. */ | |
3484 | target_dcache_invalidate (); | |
24291992 | 3485 | |
372316f1 | 3486 | ecs->ptid = do_target_wait (pid_ptid, &ecs->ws, 0); |
24291992 PA |
3487 | |
3488 | if (debug_infrun) | |
3489 | print_target_wait_results (pid_ptid, ecs->ptid, &ecs->ws); | |
3490 | ||
3491 | /* If an error happens while handling the event, propagate GDB's | |
3492 | knowledge of the executing state to the frontend/user running | |
3493 | state. */ | |
731f534f | 3494 | scoped_finish_thread_state finish_state (minus_one_ptid); |
24291992 PA |
3495 | |
3496 | /* Now figure out what to do with the result of the result. */ | |
3497 | handle_inferior_event (ecs); | |
3498 | ||
3499 | /* No error, don't finish the state yet. */ | |
731f534f | 3500 | finish_state.release (); |
24291992 PA |
3501 | |
3502 | /* Breakpoints and watchpoints are not installed on the target | |
3503 | at this point, and signals are passed directly to the | |
3504 | inferior, so this must mean the process is gone. */ | |
3505 | if (!ecs->wait_some_more) | |
3506 | { | |
9bcb1f16 | 3507 | restore_detaching.release (); |
24291992 PA |
3508 | error (_("Program exited while detaching")); |
3509 | } | |
3510 | } | |
3511 | ||
9bcb1f16 | 3512 | restore_detaching.release (); |
24291992 PA |
3513 | } |
3514 | ||
cd0fc7c3 | 3515 | /* Wait for control to return from inferior to debugger. |
ae123ec6 | 3516 | |
cd0fc7c3 SS |
3517 | If inferior gets a signal, we may decide to start it up again |
3518 | instead of returning. That is why there is a loop in this function. | |
3519 | When this function actually returns it means the inferior | |
3520 | should be left stopped and GDB should read more commands. */ | |
3521 | ||
3522 | void | |
e4c8541f | 3523 | wait_for_inferior (void) |
cd0fc7c3 | 3524 | { |
527159b7 | 3525 | if (debug_infrun) |
ae123ec6 | 3526 | fprintf_unfiltered |
e4c8541f | 3527 | (gdb_stdlog, "infrun: wait_for_inferior ()\n"); |
527159b7 | 3528 | |
4c41382a | 3529 | SCOPE_EXIT { delete_just_stopped_threads_infrun_breakpoints (); }; |
cd0fc7c3 | 3530 | |
e6f5c25b PA |
3531 | /* If an error happens while handling the event, propagate GDB's |
3532 | knowledge of the executing state to the frontend/user running | |
3533 | state. */ | |
731f534f | 3534 | scoped_finish_thread_state finish_state (minus_one_ptid); |
e6f5c25b | 3535 | |
c906108c SS |
3536 | while (1) |
3537 | { | |
ae25568b PA |
3538 | struct execution_control_state ecss; |
3539 | struct execution_control_state *ecs = &ecss; | |
963f9c80 | 3540 | ptid_t waiton_ptid = minus_one_ptid; |
29f49a6a | 3541 | |
ae25568b PA |
3542 | memset (ecs, 0, sizeof (*ecs)); |
3543 | ||
ec9499be | 3544 | overlay_cache_invalid = 1; |
ec9499be | 3545 | |
f15cb84a YQ |
3546 | /* Flush target cache before starting to handle each event. |
3547 | Target was running and cache could be stale. This is just a | |
3548 | heuristic. Running threads may modify target memory, but we | |
3549 | don't get any event. */ | |
3550 | target_dcache_invalidate (); | |
3551 | ||
372316f1 | 3552 | ecs->ptid = do_target_wait (waiton_ptid, &ecs->ws, 0); |
c906108c | 3553 | |
f00150c9 | 3554 | if (debug_infrun) |
223698f8 | 3555 | print_target_wait_results (waiton_ptid, ecs->ptid, &ecs->ws); |
f00150c9 | 3556 | |
cd0fc7c3 SS |
3557 | /* Now figure out what to do with the result of the result. */ |
3558 | handle_inferior_event (ecs); | |
c906108c | 3559 | |
cd0fc7c3 SS |
3560 | if (!ecs->wait_some_more) |
3561 | break; | |
3562 | } | |
4e1c45ea | 3563 | |
e6f5c25b | 3564 | /* No error, don't finish the state yet. */ |
731f534f | 3565 | finish_state.release (); |
cd0fc7c3 | 3566 | } |
c906108c | 3567 | |
d3d4baed PA |
3568 | /* Cleanup that reinstalls the readline callback handler, if the |
3569 | target is running in the background. If while handling the target | |
3570 | event something triggered a secondary prompt, like e.g., a | |
3571 | pagination prompt, we'll have removed the callback handler (see | |
3572 | gdb_readline_wrapper_line). Need to do this as we go back to the | |
3573 | event loop, ready to process further input. Note this has no | |
3574 | effect if the handler hasn't actually been removed, because calling | |
3575 | rl_callback_handler_install resets the line buffer, thus losing | |
3576 | input. */ | |
3577 | ||
3578 | static void | |
d238133d | 3579 | reinstall_readline_callback_handler_cleanup () |
d3d4baed | 3580 | { |
3b12939d PA |
3581 | struct ui *ui = current_ui; |
3582 | ||
3583 | if (!ui->async) | |
6c400b59 PA |
3584 | { |
3585 | /* We're not going back to the top level event loop yet. Don't | |
3586 | install the readline callback, as it'd prep the terminal, | |
3587 | readline-style (raw, noecho) (e.g., --batch). We'll install | |
3588 | it the next time the prompt is displayed, when we're ready | |
3589 | for input. */ | |
3590 | return; | |
3591 | } | |
3592 | ||
3b12939d | 3593 | if (ui->command_editing && ui->prompt_state != PROMPT_BLOCKED) |
d3d4baed PA |
3594 | gdb_rl_callback_handler_reinstall (); |
3595 | } | |
3596 | ||
243a9253 PA |
3597 | /* Clean up the FSMs of threads that are now stopped. In non-stop, |
3598 | that's just the event thread. In all-stop, that's all threads. */ | |
3599 | ||
3600 | static void | |
3601 | clean_up_just_stopped_threads_fsms (struct execution_control_state *ecs) | |
3602 | { | |
08036331 PA |
3603 | if (ecs->event_thread != NULL |
3604 | && ecs->event_thread->thread_fsm != NULL) | |
46e3ed7f | 3605 | ecs->event_thread->thread_fsm->clean_up (ecs->event_thread); |
243a9253 PA |
3606 | |
3607 | if (!non_stop) | |
3608 | { | |
08036331 | 3609 | for (thread_info *thr : all_non_exited_threads ()) |
243a9253 PA |
3610 | { |
3611 | if (thr->thread_fsm == NULL) | |
3612 | continue; | |
3613 | if (thr == ecs->event_thread) | |
3614 | continue; | |
3615 | ||
00431a78 | 3616 | switch_to_thread (thr); |
46e3ed7f | 3617 | thr->thread_fsm->clean_up (thr); |
243a9253 PA |
3618 | } |
3619 | ||
3620 | if (ecs->event_thread != NULL) | |
00431a78 | 3621 | switch_to_thread (ecs->event_thread); |
243a9253 PA |
3622 | } |
3623 | } | |
3624 | ||
3b12939d PA |
3625 | /* Helper for all_uis_check_sync_execution_done that works on the |
3626 | current UI. */ | |
3627 | ||
3628 | static void | |
3629 | check_curr_ui_sync_execution_done (void) | |
3630 | { | |
3631 | struct ui *ui = current_ui; | |
3632 | ||
3633 | if (ui->prompt_state == PROMPT_NEEDED | |
3634 | && ui->async | |
3635 | && !gdb_in_secondary_prompt_p (ui)) | |
3636 | { | |
223ffa71 | 3637 | target_terminal::ours (); |
76727919 | 3638 | gdb::observers::sync_execution_done.notify (); |
3eb7562a | 3639 | ui_register_input_event_handler (ui); |
3b12939d PA |
3640 | } |
3641 | } | |
3642 | ||
3643 | /* See infrun.h. */ | |
3644 | ||
3645 | void | |
3646 | all_uis_check_sync_execution_done (void) | |
3647 | { | |
0e454242 | 3648 | SWITCH_THRU_ALL_UIS () |
3b12939d PA |
3649 | { |
3650 | check_curr_ui_sync_execution_done (); | |
3651 | } | |
3652 | } | |
3653 | ||
a8836c93 PA |
3654 | /* See infrun.h. */ |
3655 | ||
3656 | void | |
3657 | all_uis_on_sync_execution_starting (void) | |
3658 | { | |
0e454242 | 3659 | SWITCH_THRU_ALL_UIS () |
a8836c93 PA |
3660 | { |
3661 | if (current_ui->prompt_state == PROMPT_NEEDED) | |
3662 | async_disable_stdin (); | |
3663 | } | |
3664 | } | |
3665 | ||
1777feb0 | 3666 | /* Asynchronous version of wait_for_inferior. It is called by the |
43ff13b4 | 3667 | event loop whenever a change of state is detected on the file |
1777feb0 MS |
3668 | descriptor corresponding to the target. It can be called more than |
3669 | once to complete a single execution command. In such cases we need | |
3670 | to keep the state in a global variable ECSS. If it is the last time | |
a474d7c2 PA |
3671 | that this function is called for a single execution command, then |
3672 | report to the user that the inferior has stopped, and do the | |
1777feb0 | 3673 | necessary cleanups. */ |
43ff13b4 JM |
3674 | |
3675 | void | |
fba45db2 | 3676 | fetch_inferior_event (void *client_data) |
43ff13b4 | 3677 | { |
0d1e5fa7 | 3678 | struct execution_control_state ecss; |
a474d7c2 | 3679 | struct execution_control_state *ecs = &ecss; |
0f641c01 | 3680 | int cmd_done = 0; |
963f9c80 | 3681 | ptid_t waiton_ptid = minus_one_ptid; |
43ff13b4 | 3682 | |
0d1e5fa7 PA |
3683 | memset (ecs, 0, sizeof (*ecs)); |
3684 | ||
c61db772 PA |
3685 | /* Events are always processed with the main UI as current UI. This |
3686 | way, warnings, debug output, etc. are always consistently sent to | |
3687 | the main console. */ | |
4b6749b9 | 3688 | scoped_restore save_ui = make_scoped_restore (¤t_ui, main_ui); |
c61db772 | 3689 | |
d3d4baed | 3690 | /* End up with readline processing input, if necessary. */ |
d238133d TT |
3691 | { |
3692 | SCOPE_EXIT { reinstall_readline_callback_handler_cleanup (); }; | |
3693 | ||
3694 | /* We're handling a live event, so make sure we're doing live | |
3695 | debugging. If we're looking at traceframes while the target is | |
3696 | running, we're going to need to get back to that mode after | |
3697 | handling the event. */ | |
3698 | gdb::optional<scoped_restore_current_traceframe> maybe_restore_traceframe; | |
3699 | if (non_stop) | |
3700 | { | |
3701 | maybe_restore_traceframe.emplace (); | |
3702 | set_current_traceframe (-1); | |
3703 | } | |
43ff13b4 | 3704 | |
d238133d TT |
3705 | gdb::optional<scoped_restore_current_thread> maybe_restore_thread; |
3706 | ||
3707 | if (non_stop) | |
3708 | /* In non-stop mode, the user/frontend should not notice a thread | |
3709 | switch due to internal events. Make sure we reverse to the | |
3710 | user selected thread and frame after handling the event and | |
3711 | running any breakpoint commands. */ | |
3712 | maybe_restore_thread.emplace (); | |
3713 | ||
3714 | overlay_cache_invalid = 1; | |
3715 | /* Flush target cache before starting to handle each event. Target | |
3716 | was running and cache could be stale. This is just a heuristic. | |
3717 | Running threads may modify target memory, but we don't get any | |
3718 | event. */ | |
3719 | target_dcache_invalidate (); | |
3720 | ||
3721 | scoped_restore save_exec_dir | |
3722 | = make_scoped_restore (&execution_direction, | |
3723 | target_execution_direction ()); | |
3724 | ||
3725 | ecs->ptid = do_target_wait (waiton_ptid, &ecs->ws, | |
3726 | target_can_async_p () ? TARGET_WNOHANG : 0); | |
3727 | ||
3728 | if (debug_infrun) | |
3729 | print_target_wait_results (waiton_ptid, ecs->ptid, &ecs->ws); | |
3730 | ||
3731 | /* If an error happens while handling the event, propagate GDB's | |
3732 | knowledge of the executing state to the frontend/user running | |
3733 | state. */ | |
3734 | ptid_t finish_ptid = !target_is_non_stop_p () ? minus_one_ptid : ecs->ptid; | |
3735 | scoped_finish_thread_state finish_state (finish_ptid); | |
3736 | ||
979a0d13 | 3737 | /* Get executed before scoped_restore_current_thread above to apply |
d238133d TT |
3738 | still for the thread which has thrown the exception. */ |
3739 | auto defer_bpstat_clear | |
3740 | = make_scope_exit (bpstat_clear_actions); | |
3741 | auto defer_delete_threads | |
3742 | = make_scope_exit (delete_just_stopped_threads_infrun_breakpoints); | |
3743 | ||
3744 | /* Now figure out what to do with the result of the result. */ | |
3745 | handle_inferior_event (ecs); | |
3746 | ||
3747 | if (!ecs->wait_some_more) | |
3748 | { | |
3749 | struct inferior *inf = find_inferior_ptid (ecs->ptid); | |
3750 | int should_stop = 1; | |
3751 | struct thread_info *thr = ecs->event_thread; | |
d6b48e9c | 3752 | |
d238133d | 3753 | delete_just_stopped_threads_infrun_breakpoints (); |
f107f563 | 3754 | |
d238133d TT |
3755 | if (thr != NULL) |
3756 | { | |
3757 | struct thread_fsm *thread_fsm = thr->thread_fsm; | |
243a9253 | 3758 | |
d238133d | 3759 | if (thread_fsm != NULL) |
46e3ed7f | 3760 | should_stop = thread_fsm->should_stop (thr); |
d238133d | 3761 | } |
243a9253 | 3762 | |
d238133d TT |
3763 | if (!should_stop) |
3764 | { | |
3765 | keep_going (ecs); | |
3766 | } | |
3767 | else | |
3768 | { | |
46e3ed7f | 3769 | bool should_notify_stop = true; |
d238133d | 3770 | int proceeded = 0; |
1840d81a | 3771 | |
d238133d | 3772 | clean_up_just_stopped_threads_fsms (ecs); |
243a9253 | 3773 | |
d238133d | 3774 | if (thr != NULL && thr->thread_fsm != NULL) |
46e3ed7f | 3775 | should_notify_stop = thr->thread_fsm->should_notify_stop (); |
388a7084 | 3776 | |
d238133d TT |
3777 | if (should_notify_stop) |
3778 | { | |
3779 | /* We may not find an inferior if this was a process exit. */ | |
3780 | if (inf == NULL || inf->control.stop_soon == NO_STOP_QUIETLY) | |
3781 | proceeded = normal_stop (); | |
3782 | } | |
243a9253 | 3783 | |
d238133d TT |
3784 | if (!proceeded) |
3785 | { | |
3786 | inferior_event_handler (INF_EXEC_COMPLETE, NULL); | |
3787 | cmd_done = 1; | |
3788 | } | |
3789 | } | |
3790 | } | |
4f8d22e3 | 3791 | |
d238133d TT |
3792 | defer_delete_threads.release (); |
3793 | defer_bpstat_clear.release (); | |
29f49a6a | 3794 | |
d238133d TT |
3795 | /* No error, don't finish the thread states yet. */ |
3796 | finish_state.release (); | |
731f534f | 3797 | |
d238133d TT |
3798 | /* This scope is used to ensure that readline callbacks are |
3799 | reinstalled here. */ | |
3800 | } | |
4f8d22e3 | 3801 | |
3b12939d PA |
3802 | /* If a UI was in sync execution mode, and now isn't, restore its |
3803 | prompt (a synchronous execution command has finished, and we're | |
3804 | ready for input). */ | |
3805 | all_uis_check_sync_execution_done (); | |
0f641c01 PA |
3806 | |
3807 | if (cmd_done | |
0f641c01 | 3808 | && exec_done_display_p |
00431a78 PA |
3809 | && (inferior_ptid == null_ptid |
3810 | || inferior_thread ()->state != THREAD_RUNNING)) | |
0f641c01 | 3811 | printf_unfiltered (_("completed.\n")); |
43ff13b4 JM |
3812 | } |
3813 | ||
edb3359d DJ |
3814 | /* Record the frame and location we're currently stepping through. */ |
3815 | void | |
3816 | set_step_info (struct frame_info *frame, struct symtab_and_line sal) | |
3817 | { | |
3818 | struct thread_info *tp = inferior_thread (); | |
3819 | ||
16c381f0 JK |
3820 | tp->control.step_frame_id = get_frame_id (frame); |
3821 | tp->control.step_stack_frame_id = get_stack_frame_id (frame); | |
edb3359d DJ |
3822 | |
3823 | tp->current_symtab = sal.symtab; | |
3824 | tp->current_line = sal.line; | |
3825 | } | |
3826 | ||
0d1e5fa7 PA |
3827 | /* Clear context switchable stepping state. */ |
3828 | ||
3829 | void | |
4e1c45ea | 3830 | init_thread_stepping_state (struct thread_info *tss) |
0d1e5fa7 | 3831 | { |
7f5ef605 | 3832 | tss->stepped_breakpoint = 0; |
0d1e5fa7 | 3833 | tss->stepping_over_breakpoint = 0; |
963f9c80 | 3834 | tss->stepping_over_watchpoint = 0; |
0d1e5fa7 | 3835 | tss->step_after_step_resume_breakpoint = 0; |
cd0fc7c3 SS |
3836 | } |
3837 | ||
c32c64b7 DE |
3838 | /* Set the cached copy of the last ptid/waitstatus. */ |
3839 | ||
6efcd9a8 | 3840 | void |
c32c64b7 DE |
3841 | set_last_target_status (ptid_t ptid, struct target_waitstatus status) |
3842 | { | |
3843 | target_last_wait_ptid = ptid; | |
3844 | target_last_waitstatus = status; | |
3845 | } | |
3846 | ||
e02bc4cc | 3847 | /* Return the cached copy of the last pid/waitstatus returned by |
9a4105ab AC |
3848 | target_wait()/deprecated_target_wait_hook(). The data is actually |
3849 | cached by handle_inferior_event(), which gets called immediately | |
3850 | after target_wait()/deprecated_target_wait_hook(). */ | |
e02bc4cc DS |
3851 | |
3852 | void | |
488f131b | 3853 | get_last_target_status (ptid_t *ptidp, struct target_waitstatus *status) |
e02bc4cc | 3854 | { |
39f77062 | 3855 | *ptidp = target_last_wait_ptid; |
e02bc4cc DS |
3856 | *status = target_last_waitstatus; |
3857 | } | |
3858 | ||
ac264b3b MS |
3859 | void |
3860 | nullify_last_target_wait_ptid (void) | |
3861 | { | |
3862 | target_last_wait_ptid = minus_one_ptid; | |
3863 | } | |
3864 | ||
dcf4fbde | 3865 | /* Switch thread contexts. */ |
dd80620e MS |
3866 | |
3867 | static void | |
00431a78 | 3868 | context_switch (execution_control_state *ecs) |
dd80620e | 3869 | { |
00431a78 PA |
3870 | if (debug_infrun |
3871 | && ecs->ptid != inferior_ptid | |
3872 | && ecs->event_thread != inferior_thread ()) | |
fd48f117 DJ |
3873 | { |
3874 | fprintf_unfiltered (gdb_stdlog, "infrun: Switching context from %s ", | |
a068643d | 3875 | target_pid_to_str (inferior_ptid).c_str ()); |
fd48f117 | 3876 | fprintf_unfiltered (gdb_stdlog, "to %s\n", |
a068643d | 3877 | target_pid_to_str (ecs->ptid).c_str ()); |
fd48f117 DJ |
3878 | } |
3879 | ||
00431a78 | 3880 | switch_to_thread (ecs->event_thread); |
dd80620e MS |
3881 | } |
3882 | ||
d8dd4d5f PA |
3883 | /* If the target can't tell whether we've hit breakpoints |
3884 | (target_supports_stopped_by_sw_breakpoint), and we got a SIGTRAP, | |
3885 | check whether that could have been caused by a breakpoint. If so, | |
3886 | adjust the PC, per gdbarch_decr_pc_after_break. */ | |
3887 | ||
4fa8626c | 3888 | static void |
d8dd4d5f PA |
3889 | adjust_pc_after_break (struct thread_info *thread, |
3890 | struct target_waitstatus *ws) | |
4fa8626c | 3891 | { |
24a73cce UW |
3892 | struct regcache *regcache; |
3893 | struct gdbarch *gdbarch; | |
118e6252 | 3894 | CORE_ADDR breakpoint_pc, decr_pc; |
4fa8626c | 3895 | |
4fa8626c DJ |
3896 | /* If we've hit a breakpoint, we'll normally be stopped with SIGTRAP. If |
3897 | we aren't, just return. | |
9709f61c DJ |
3898 | |
3899 | We assume that waitkinds other than TARGET_WAITKIND_STOPPED are not | |
b798847d UW |
3900 | affected by gdbarch_decr_pc_after_break. Other waitkinds which are |
3901 | implemented by software breakpoints should be handled through the normal | |
3902 | breakpoint layer. | |
8fb3e588 | 3903 | |
4fa8626c DJ |
3904 | NOTE drow/2004-01-31: On some targets, breakpoints may generate |
3905 | different signals (SIGILL or SIGEMT for instance), but it is less | |
3906 | clear where the PC is pointing afterwards. It may not match | |
b798847d UW |
3907 | gdbarch_decr_pc_after_break. I don't know any specific target that |
3908 | generates these signals at breakpoints (the code has been in GDB since at | |
3909 | least 1992) so I can not guess how to handle them here. | |
8fb3e588 | 3910 | |
e6cf7916 UW |
3911 | In earlier versions of GDB, a target with |
3912 | gdbarch_have_nonsteppable_watchpoint would have the PC after hitting a | |
b798847d UW |
3913 | watchpoint affected by gdbarch_decr_pc_after_break. I haven't found any |
3914 | target with both of these set in GDB history, and it seems unlikely to be | |
3915 | correct, so gdbarch_have_nonsteppable_watchpoint is not checked here. */ | |
4fa8626c | 3916 | |
d8dd4d5f | 3917 | if (ws->kind != TARGET_WAITKIND_STOPPED) |
4fa8626c DJ |
3918 | return; |
3919 | ||
d8dd4d5f | 3920 | if (ws->value.sig != GDB_SIGNAL_TRAP) |
4fa8626c DJ |
3921 | return; |
3922 | ||
4058b839 PA |
3923 | /* In reverse execution, when a breakpoint is hit, the instruction |
3924 | under it has already been de-executed. The reported PC always | |
3925 | points at the breakpoint address, so adjusting it further would | |
3926 | be wrong. E.g., consider this case on a decr_pc_after_break == 1 | |
3927 | architecture: | |
3928 | ||
3929 | B1 0x08000000 : INSN1 | |
3930 | B2 0x08000001 : INSN2 | |
3931 | 0x08000002 : INSN3 | |
3932 | PC -> 0x08000003 : INSN4 | |
3933 | ||
3934 | Say you're stopped at 0x08000003 as above. Reverse continuing | |
3935 | from that point should hit B2 as below. Reading the PC when the | |
3936 | SIGTRAP is reported should read 0x08000001 and INSN2 should have | |
3937 | been de-executed already. | |
3938 | ||
3939 | B1 0x08000000 : INSN1 | |
3940 | B2 PC -> 0x08000001 : INSN2 | |
3941 | 0x08000002 : INSN3 | |
3942 | 0x08000003 : INSN4 | |
3943 | ||
3944 | We can't apply the same logic as for forward execution, because | |
3945 | we would wrongly adjust the PC to 0x08000000, since there's a | |
3946 | breakpoint at PC - 1. We'd then report a hit on B1, although | |
3947 | INSN1 hadn't been de-executed yet. Doing nothing is the correct | |
3948 | behaviour. */ | |
3949 | if (execution_direction == EXEC_REVERSE) | |
3950 | return; | |
3951 | ||
1cf4d951 PA |
3952 | /* If the target can tell whether the thread hit a SW breakpoint, |
3953 | trust it. Targets that can tell also adjust the PC | |
3954 | themselves. */ | |
3955 | if (target_supports_stopped_by_sw_breakpoint ()) | |
3956 | return; | |
3957 | ||
3958 | /* Note that relying on whether a breakpoint is planted in memory to | |
3959 | determine this can fail. E.g,. the breakpoint could have been | |
3960 | removed since. Or the thread could have been told to step an | |
3961 | instruction the size of a breakpoint instruction, and only | |
3962 | _after_ was a breakpoint inserted at its address. */ | |
3963 | ||
24a73cce UW |
3964 | /* If this target does not decrement the PC after breakpoints, then |
3965 | we have nothing to do. */ | |
00431a78 | 3966 | regcache = get_thread_regcache (thread); |
ac7936df | 3967 | gdbarch = regcache->arch (); |
118e6252 | 3968 | |
527a273a | 3969 | decr_pc = gdbarch_decr_pc_after_break (gdbarch); |
118e6252 | 3970 | if (decr_pc == 0) |
24a73cce UW |
3971 | return; |
3972 | ||
8b86c959 | 3973 | const address_space *aspace = regcache->aspace (); |
6c95b8df | 3974 | |
8aad930b AC |
3975 | /* Find the location where (if we've hit a breakpoint) the |
3976 | breakpoint would be. */ | |
118e6252 | 3977 | breakpoint_pc = regcache_read_pc (regcache) - decr_pc; |
8aad930b | 3978 | |
1cf4d951 PA |
3979 | /* If the target can't tell whether a software breakpoint triggered, |
3980 | fallback to figuring it out based on breakpoints we think were | |
3981 | inserted in the target, and on whether the thread was stepped or | |
3982 | continued. */ | |
3983 | ||
1c5cfe86 PA |
3984 | /* Check whether there actually is a software breakpoint inserted at |
3985 | that location. | |
3986 | ||
3987 | If in non-stop mode, a race condition is possible where we've | |
3988 | removed a breakpoint, but stop events for that breakpoint were | |
3989 | already queued and arrive later. To suppress those spurious | |
3990 | SIGTRAPs, we keep a list of such breakpoint locations for a bit, | |
1cf4d951 PA |
3991 | and retire them after a number of stop events are reported. Note |
3992 | this is an heuristic and can thus get confused. The real fix is | |
3993 | to get the "stopped by SW BP and needs adjustment" info out of | |
3994 | the target/kernel (and thus never reach here; see above). */ | |
6c95b8df | 3995 | if (software_breakpoint_inserted_here_p (aspace, breakpoint_pc) |
fbea99ea PA |
3996 | || (target_is_non_stop_p () |
3997 | && moribund_breakpoint_here_p (aspace, breakpoint_pc))) | |
8aad930b | 3998 | { |
07036511 | 3999 | gdb::optional<scoped_restore_tmpl<int>> restore_operation_disable; |
abbb1732 | 4000 | |
8213266a | 4001 | if (record_full_is_used ()) |
07036511 TT |
4002 | restore_operation_disable.emplace |
4003 | (record_full_gdb_operation_disable_set ()); | |
96429cc8 | 4004 | |
1c0fdd0e UW |
4005 | /* When using hardware single-step, a SIGTRAP is reported for both |
4006 | a completed single-step and a software breakpoint. Need to | |
4007 | differentiate between the two, as the latter needs adjusting | |
4008 | but the former does not. | |
4009 | ||
4010 | The SIGTRAP can be due to a completed hardware single-step only if | |
4011 | - we didn't insert software single-step breakpoints | |
1c0fdd0e UW |
4012 | - this thread is currently being stepped |
4013 | ||
4014 | If any of these events did not occur, we must have stopped due | |
4015 | to hitting a software breakpoint, and have to back up to the | |
4016 | breakpoint address. | |
4017 | ||
4018 | As a special case, we could have hardware single-stepped a | |
4019 | software breakpoint. In this case (prev_pc == breakpoint_pc), | |
4020 | we also need to back up to the breakpoint address. */ | |
4021 | ||
d8dd4d5f PA |
4022 | if (thread_has_single_step_breakpoints_set (thread) |
4023 | || !currently_stepping (thread) | |
4024 | || (thread->stepped_breakpoint | |
4025 | && thread->prev_pc == breakpoint_pc)) | |
515630c5 | 4026 | regcache_write_pc (regcache, breakpoint_pc); |
8aad930b | 4027 | } |
4fa8626c DJ |
4028 | } |
4029 | ||
edb3359d DJ |
4030 | static int |
4031 | stepped_in_from (struct frame_info *frame, struct frame_id step_frame_id) | |
4032 | { | |
4033 | for (frame = get_prev_frame (frame); | |
4034 | frame != NULL; | |
4035 | frame = get_prev_frame (frame)) | |
4036 | { | |
4037 | if (frame_id_eq (get_frame_id (frame), step_frame_id)) | |
4038 | return 1; | |
4039 | if (get_frame_type (frame) != INLINE_FRAME) | |
4040 | break; | |
4041 | } | |
4042 | ||
4043 | return 0; | |
4044 | } | |
4045 | ||
c65d6b55 PA |
4046 | /* If the event thread has the stop requested flag set, pretend it |
4047 | stopped for a GDB_SIGNAL_0 (i.e., as if it stopped due to | |
4048 | target_stop). */ | |
4049 | ||
4050 | static bool | |
4051 | handle_stop_requested (struct execution_control_state *ecs) | |
4052 | { | |
4053 | if (ecs->event_thread->stop_requested) | |
4054 | { | |
4055 | ecs->ws.kind = TARGET_WAITKIND_STOPPED; | |
4056 | ecs->ws.value.sig = GDB_SIGNAL_0; | |
4057 | handle_signal_stop (ecs); | |
4058 | return true; | |
4059 | } | |
4060 | return false; | |
4061 | } | |
4062 | ||
a96d9b2e SDJ |
4063 | /* Auxiliary function that handles syscall entry/return events. |
4064 | It returns 1 if the inferior should keep going (and GDB | |
4065 | should ignore the event), or 0 if the event deserves to be | |
4066 | processed. */ | |
ca2163eb | 4067 | |
a96d9b2e | 4068 | static int |
ca2163eb | 4069 | handle_syscall_event (struct execution_control_state *ecs) |
a96d9b2e | 4070 | { |
ca2163eb | 4071 | struct regcache *regcache; |
ca2163eb PA |
4072 | int syscall_number; |
4073 | ||
00431a78 | 4074 | context_switch (ecs); |
ca2163eb | 4075 | |
00431a78 | 4076 | regcache = get_thread_regcache (ecs->event_thread); |
f90263c1 | 4077 | syscall_number = ecs->ws.value.syscall_number; |
f2ffa92b | 4078 | ecs->event_thread->suspend.stop_pc = regcache_read_pc (regcache); |
ca2163eb | 4079 | |
a96d9b2e SDJ |
4080 | if (catch_syscall_enabled () > 0 |
4081 | && catching_syscall_number (syscall_number) > 0) | |
4082 | { | |
4083 | if (debug_infrun) | |
4084 | fprintf_unfiltered (gdb_stdlog, "infrun: syscall number = '%d'\n", | |
4085 | syscall_number); | |
a96d9b2e | 4086 | |
16c381f0 | 4087 | ecs->event_thread->control.stop_bpstat |
a01bda52 | 4088 | = bpstat_stop_status (regcache->aspace (), |
f2ffa92b PA |
4089 | ecs->event_thread->suspend.stop_pc, |
4090 | ecs->event_thread, &ecs->ws); | |
ab04a2af | 4091 | |
c65d6b55 PA |
4092 | if (handle_stop_requested (ecs)) |
4093 | return 0; | |
4094 | ||
ce12b012 | 4095 | if (bpstat_causes_stop (ecs->event_thread->control.stop_bpstat)) |
ca2163eb PA |
4096 | { |
4097 | /* Catchpoint hit. */ | |
ca2163eb PA |
4098 | return 0; |
4099 | } | |
a96d9b2e | 4100 | } |
ca2163eb | 4101 | |
c65d6b55 PA |
4102 | if (handle_stop_requested (ecs)) |
4103 | return 0; | |
4104 | ||
ca2163eb | 4105 | /* If no catchpoint triggered for this, then keep going. */ |
ca2163eb PA |
4106 | keep_going (ecs); |
4107 | return 1; | |
a96d9b2e SDJ |
4108 | } |
4109 | ||
7e324e48 GB |
4110 | /* Lazily fill in the execution_control_state's stop_func_* fields. */ |
4111 | ||
4112 | static void | |
4113 | fill_in_stop_func (struct gdbarch *gdbarch, | |
4114 | struct execution_control_state *ecs) | |
4115 | { | |
4116 | if (!ecs->stop_func_filled_in) | |
4117 | { | |
4118 | /* Don't care about return value; stop_func_start and stop_func_name | |
4119 | will both be 0 if it doesn't work. */ | |
59adbf5d KB |
4120 | find_function_entry_range_from_pc (ecs->event_thread->suspend.stop_pc, |
4121 | &ecs->stop_func_name, | |
4122 | &ecs->stop_func_start, | |
4123 | &ecs->stop_func_end); | |
7e324e48 GB |
4124 | ecs->stop_func_start |
4125 | += gdbarch_deprecated_function_start_offset (gdbarch); | |
4126 | ||
591a12a1 UW |
4127 | if (gdbarch_skip_entrypoint_p (gdbarch)) |
4128 | ecs->stop_func_start = gdbarch_skip_entrypoint (gdbarch, | |
4129 | ecs->stop_func_start); | |
4130 | ||
7e324e48 GB |
4131 | ecs->stop_func_filled_in = 1; |
4132 | } | |
4133 | } | |
4134 | ||
4f5d7f63 | 4135 | |
00431a78 | 4136 | /* Return the STOP_SOON field of the inferior pointed at by ECS. */ |
4f5d7f63 PA |
4137 | |
4138 | static enum stop_kind | |
00431a78 | 4139 | get_inferior_stop_soon (execution_control_state *ecs) |
4f5d7f63 | 4140 | { |
00431a78 | 4141 | struct inferior *inf = find_inferior_ptid (ecs->ptid); |
4f5d7f63 PA |
4142 | |
4143 | gdb_assert (inf != NULL); | |
4144 | return inf->control.stop_soon; | |
4145 | } | |
4146 | ||
372316f1 PA |
4147 | /* Wait for one event. Store the resulting waitstatus in WS, and |
4148 | return the event ptid. */ | |
4149 | ||
4150 | static ptid_t | |
4151 | wait_one (struct target_waitstatus *ws) | |
4152 | { | |
4153 | ptid_t event_ptid; | |
4154 | ptid_t wait_ptid = minus_one_ptid; | |
4155 | ||
4156 | overlay_cache_invalid = 1; | |
4157 | ||
4158 | /* Flush target cache before starting to handle each event. | |
4159 | Target was running and cache could be stale. This is just a | |
4160 | heuristic. Running threads may modify target memory, but we | |
4161 | don't get any event. */ | |
4162 | target_dcache_invalidate (); | |
4163 | ||
4164 | if (deprecated_target_wait_hook) | |
4165 | event_ptid = deprecated_target_wait_hook (wait_ptid, ws, 0); | |
4166 | else | |
4167 | event_ptid = target_wait (wait_ptid, ws, 0); | |
4168 | ||
4169 | if (debug_infrun) | |
4170 | print_target_wait_results (wait_ptid, event_ptid, ws); | |
4171 | ||
4172 | return event_ptid; | |
4173 | } | |
4174 | ||
4175 | /* Generate a wrapper for target_stopped_by_REASON that works on PTID | |
4176 | instead of the current thread. */ | |
4177 | #define THREAD_STOPPED_BY(REASON) \ | |
4178 | static int \ | |
4179 | thread_stopped_by_ ## REASON (ptid_t ptid) \ | |
4180 | { \ | |
2989a365 | 4181 | scoped_restore save_inferior_ptid = make_scoped_restore (&inferior_ptid); \ |
372316f1 PA |
4182 | inferior_ptid = ptid; \ |
4183 | \ | |
2989a365 | 4184 | return target_stopped_by_ ## REASON (); \ |
372316f1 PA |
4185 | } |
4186 | ||
4187 | /* Generate thread_stopped_by_watchpoint. */ | |
4188 | THREAD_STOPPED_BY (watchpoint) | |
4189 | /* Generate thread_stopped_by_sw_breakpoint. */ | |
4190 | THREAD_STOPPED_BY (sw_breakpoint) | |
4191 | /* Generate thread_stopped_by_hw_breakpoint. */ | |
4192 | THREAD_STOPPED_BY (hw_breakpoint) | |
4193 | ||
372316f1 PA |
4194 | /* Save the thread's event and stop reason to process it later. */ |
4195 | ||
4196 | static void | |
4197 | save_waitstatus (struct thread_info *tp, struct target_waitstatus *ws) | |
4198 | { | |
372316f1 PA |
4199 | if (debug_infrun) |
4200 | { | |
23fdd69e | 4201 | std::string statstr = target_waitstatus_to_string (ws); |
372316f1 | 4202 | |
372316f1 PA |
4203 | fprintf_unfiltered (gdb_stdlog, |
4204 | "infrun: saving status %s for %d.%ld.%ld\n", | |
23fdd69e | 4205 | statstr.c_str (), |
e99b03dc | 4206 | tp->ptid.pid (), |
e38504b3 | 4207 | tp->ptid.lwp (), |
cc6bcb54 | 4208 | tp->ptid.tid ()); |
372316f1 PA |
4209 | } |
4210 | ||
4211 | /* Record for later. */ | |
4212 | tp->suspend.waitstatus = *ws; | |
4213 | tp->suspend.waitstatus_pending_p = 1; | |
4214 | ||
00431a78 | 4215 | struct regcache *regcache = get_thread_regcache (tp); |
8b86c959 | 4216 | const address_space *aspace = regcache->aspace (); |
372316f1 PA |
4217 | |
4218 | if (ws->kind == TARGET_WAITKIND_STOPPED | |
4219 | && ws->value.sig == GDB_SIGNAL_TRAP) | |
4220 | { | |
4221 | CORE_ADDR pc = regcache_read_pc (regcache); | |
4222 | ||
4223 | adjust_pc_after_break (tp, &tp->suspend.waitstatus); | |
4224 | ||
4225 | if (thread_stopped_by_watchpoint (tp->ptid)) | |
4226 | { | |
4227 | tp->suspend.stop_reason | |
4228 | = TARGET_STOPPED_BY_WATCHPOINT; | |
4229 | } | |
4230 | else if (target_supports_stopped_by_sw_breakpoint () | |
4231 | && thread_stopped_by_sw_breakpoint (tp->ptid)) | |
4232 | { | |
4233 | tp->suspend.stop_reason | |
4234 | = TARGET_STOPPED_BY_SW_BREAKPOINT; | |
4235 | } | |
4236 | else if (target_supports_stopped_by_hw_breakpoint () | |
4237 | && thread_stopped_by_hw_breakpoint (tp->ptid)) | |
4238 | { | |
4239 | tp->suspend.stop_reason | |
4240 | = TARGET_STOPPED_BY_HW_BREAKPOINT; | |
4241 | } | |
4242 | else if (!target_supports_stopped_by_hw_breakpoint () | |
4243 | && hardware_breakpoint_inserted_here_p (aspace, | |
4244 | pc)) | |
4245 | { | |
4246 | tp->suspend.stop_reason | |
4247 | = TARGET_STOPPED_BY_HW_BREAKPOINT; | |
4248 | } | |
4249 | else if (!target_supports_stopped_by_sw_breakpoint () | |
4250 | && software_breakpoint_inserted_here_p (aspace, | |
4251 | pc)) | |
4252 | { | |
4253 | tp->suspend.stop_reason | |
4254 | = TARGET_STOPPED_BY_SW_BREAKPOINT; | |
4255 | } | |
4256 | else if (!thread_has_single_step_breakpoints_set (tp) | |
4257 | && currently_stepping (tp)) | |
4258 | { | |
4259 | tp->suspend.stop_reason | |
4260 | = TARGET_STOPPED_BY_SINGLE_STEP; | |
4261 | } | |
4262 | } | |
4263 | } | |
4264 | ||
6efcd9a8 | 4265 | /* See infrun.h. */ |
372316f1 | 4266 | |
6efcd9a8 | 4267 | void |
372316f1 PA |
4268 | stop_all_threads (void) |
4269 | { | |
4270 | /* We may need multiple passes to discover all threads. */ | |
4271 | int pass; | |
4272 | int iterations = 0; | |
372316f1 | 4273 | |
fbea99ea | 4274 | gdb_assert (target_is_non_stop_p ()); |
372316f1 PA |
4275 | |
4276 | if (debug_infrun) | |
4277 | fprintf_unfiltered (gdb_stdlog, "infrun: stop_all_threads\n"); | |
4278 | ||
00431a78 | 4279 | scoped_restore_current_thread restore_thread; |
372316f1 | 4280 | |
65706a29 | 4281 | target_thread_events (1); |
9885e6bb | 4282 | SCOPE_EXIT { target_thread_events (0); }; |
65706a29 | 4283 | |
372316f1 PA |
4284 | /* Request threads to stop, and then wait for the stops. Because |
4285 | threads we already know about can spawn more threads while we're | |
4286 | trying to stop them, and we only learn about new threads when we | |
4287 | update the thread list, do this in a loop, and keep iterating | |
4288 | until two passes find no threads that need to be stopped. */ | |
4289 | for (pass = 0; pass < 2; pass++, iterations++) | |
4290 | { | |
4291 | if (debug_infrun) | |
4292 | fprintf_unfiltered (gdb_stdlog, | |
4293 | "infrun: stop_all_threads, pass=%d, " | |
4294 | "iterations=%d\n", pass, iterations); | |
4295 | while (1) | |
4296 | { | |
4297 | ptid_t event_ptid; | |
4298 | struct target_waitstatus ws; | |
4299 | int need_wait = 0; | |
372316f1 PA |
4300 | |
4301 | update_thread_list (); | |
4302 | ||
4303 | /* Go through all threads looking for threads that we need | |
4304 | to tell the target to stop. */ | |
08036331 | 4305 | for (thread_info *t : all_non_exited_threads ()) |
372316f1 PA |
4306 | { |
4307 | if (t->executing) | |
4308 | { | |
4309 | /* If already stopping, don't request a stop again. | |
4310 | We just haven't seen the notification yet. */ | |
4311 | if (!t->stop_requested) | |
4312 | { | |
4313 | if (debug_infrun) | |
4314 | fprintf_unfiltered (gdb_stdlog, | |
4315 | "infrun: %s executing, " | |
4316 | "need stop\n", | |
a068643d | 4317 | target_pid_to_str (t->ptid).c_str ()); |
372316f1 PA |
4318 | target_stop (t->ptid); |
4319 | t->stop_requested = 1; | |
4320 | } | |
4321 | else | |
4322 | { | |
4323 | if (debug_infrun) | |
4324 | fprintf_unfiltered (gdb_stdlog, | |
4325 | "infrun: %s executing, " | |
4326 | "already stopping\n", | |
a068643d | 4327 | target_pid_to_str (t->ptid).c_str ()); |
372316f1 PA |
4328 | } |
4329 | ||
4330 | if (t->stop_requested) | |
4331 | need_wait = 1; | |
4332 | } | |
4333 | else | |
4334 | { | |
4335 | if (debug_infrun) | |
4336 | fprintf_unfiltered (gdb_stdlog, | |
4337 | "infrun: %s not executing\n", | |
a068643d | 4338 | target_pid_to_str (t->ptid).c_str ()); |
372316f1 PA |
4339 | |
4340 | /* The thread may be not executing, but still be | |
4341 | resumed with a pending status to process. */ | |
4342 | t->resumed = 0; | |
4343 | } | |
4344 | } | |
4345 | ||
4346 | if (!need_wait) | |
4347 | break; | |
4348 | ||
4349 | /* If we find new threads on the second iteration, restart | |
4350 | over. We want to see two iterations in a row with all | |
4351 | threads stopped. */ | |
4352 | if (pass > 0) | |
4353 | pass = -1; | |
4354 | ||
4355 | event_ptid = wait_one (&ws); | |
c29705b7 | 4356 | if (debug_infrun) |
372316f1 | 4357 | { |
c29705b7 PW |
4358 | fprintf_unfiltered (gdb_stdlog, |
4359 | "infrun: stop_all_threads %s %s\n", | |
4360 | target_waitstatus_to_string (&ws).c_str (), | |
4361 | target_pid_to_str (event_ptid).c_str ()); | |
372316f1 | 4362 | } |
372316f1 | 4363 | |
c29705b7 PW |
4364 | if (ws.kind == TARGET_WAITKIND_NO_RESUMED |
4365 | || ws.kind == TARGET_WAITKIND_THREAD_EXITED | |
4366 | || ws.kind == TARGET_WAITKIND_EXITED | |
4367 | || ws.kind == TARGET_WAITKIND_SIGNALLED) | |
4368 | { | |
4369 | /* All resumed threads exited | |
4370 | or one thread/process exited/signalled. */ | |
372316f1 PA |
4371 | } |
4372 | else | |
4373 | { | |
08036331 | 4374 | thread_info *t = find_thread_ptid (event_ptid); |
372316f1 PA |
4375 | if (t == NULL) |
4376 | t = add_thread (event_ptid); | |
4377 | ||
4378 | t->stop_requested = 0; | |
4379 | t->executing = 0; | |
4380 | t->resumed = 0; | |
4381 | t->control.may_range_step = 0; | |
4382 | ||
6efcd9a8 PA |
4383 | /* This may be the first time we see the inferior report |
4384 | a stop. */ | |
08036331 | 4385 | inferior *inf = find_inferior_ptid (event_ptid); |
6efcd9a8 PA |
4386 | if (inf->needs_setup) |
4387 | { | |
4388 | switch_to_thread_no_regs (t); | |
4389 | setup_inferior (0); | |
4390 | } | |
4391 | ||
372316f1 PA |
4392 | if (ws.kind == TARGET_WAITKIND_STOPPED |
4393 | && ws.value.sig == GDB_SIGNAL_0) | |
4394 | { | |
4395 | /* We caught the event that we intended to catch, so | |
4396 | there's no event pending. */ | |
4397 | t->suspend.waitstatus.kind = TARGET_WAITKIND_IGNORE; | |
4398 | t->suspend.waitstatus_pending_p = 0; | |
4399 | ||
00431a78 | 4400 | if (displaced_step_fixup (t, GDB_SIGNAL_0) < 0) |
372316f1 PA |
4401 | { |
4402 | /* Add it back to the step-over queue. */ | |
4403 | if (debug_infrun) | |
4404 | { | |
4405 | fprintf_unfiltered (gdb_stdlog, | |
4406 | "infrun: displaced-step of %s " | |
4407 | "canceled: adding back to the " | |
4408 | "step-over queue\n", | |
a068643d | 4409 | target_pid_to_str (t->ptid).c_str ()); |
372316f1 PA |
4410 | } |
4411 | t->control.trap_expected = 0; | |
4412 | thread_step_over_chain_enqueue (t); | |
4413 | } | |
4414 | } | |
4415 | else | |
4416 | { | |
4417 | enum gdb_signal sig; | |
4418 | struct regcache *regcache; | |
372316f1 PA |
4419 | |
4420 | if (debug_infrun) | |
4421 | { | |
23fdd69e | 4422 | std::string statstr = target_waitstatus_to_string (&ws); |
372316f1 | 4423 | |
372316f1 PA |
4424 | fprintf_unfiltered (gdb_stdlog, |
4425 | "infrun: target_wait %s, saving " | |
4426 | "status for %d.%ld.%ld\n", | |
23fdd69e | 4427 | statstr.c_str (), |
e99b03dc | 4428 | t->ptid.pid (), |
e38504b3 | 4429 | t->ptid.lwp (), |
cc6bcb54 | 4430 | t->ptid.tid ()); |
372316f1 PA |
4431 | } |
4432 | ||
4433 | /* Record for later. */ | |
4434 | save_waitstatus (t, &ws); | |
4435 | ||
4436 | sig = (ws.kind == TARGET_WAITKIND_STOPPED | |
4437 | ? ws.value.sig : GDB_SIGNAL_0); | |
4438 | ||
00431a78 | 4439 | if (displaced_step_fixup (t, sig) < 0) |
372316f1 PA |
4440 | { |
4441 | /* Add it back to the step-over queue. */ | |
4442 | t->control.trap_expected = 0; | |
4443 | thread_step_over_chain_enqueue (t); | |
4444 | } | |
4445 | ||
00431a78 | 4446 | regcache = get_thread_regcache (t); |
372316f1 PA |
4447 | t->suspend.stop_pc = regcache_read_pc (regcache); |
4448 | ||
4449 | if (debug_infrun) | |
4450 | { | |
4451 | fprintf_unfiltered (gdb_stdlog, | |
4452 | "infrun: saved stop_pc=%s for %s " | |
4453 | "(currently_stepping=%d)\n", | |
4454 | paddress (target_gdbarch (), | |
4455 | t->suspend.stop_pc), | |
a068643d | 4456 | target_pid_to_str (t->ptid).c_str (), |
372316f1 PA |
4457 | currently_stepping (t)); |
4458 | } | |
4459 | } | |
4460 | } | |
4461 | } | |
4462 | } | |
4463 | ||
372316f1 PA |
4464 | if (debug_infrun) |
4465 | fprintf_unfiltered (gdb_stdlog, "infrun: stop_all_threads done\n"); | |
4466 | } | |
4467 | ||
f4836ba9 PA |
4468 | /* Handle a TARGET_WAITKIND_NO_RESUMED event. */ |
4469 | ||
4470 | static int | |
4471 | handle_no_resumed (struct execution_control_state *ecs) | |
4472 | { | |
3b12939d | 4473 | if (target_can_async_p ()) |
f4836ba9 | 4474 | { |
3b12939d PA |
4475 | struct ui *ui; |
4476 | int any_sync = 0; | |
f4836ba9 | 4477 | |
3b12939d PA |
4478 | ALL_UIS (ui) |
4479 | { | |
4480 | if (ui->prompt_state == PROMPT_BLOCKED) | |
4481 | { | |
4482 | any_sync = 1; | |
4483 | break; | |
4484 | } | |
4485 | } | |
4486 | if (!any_sync) | |
4487 | { | |
4488 | /* There were no unwaited-for children left in the target, but, | |
4489 | we're not synchronously waiting for events either. Just | |
4490 | ignore. */ | |
4491 | ||
4492 | if (debug_infrun) | |
4493 | fprintf_unfiltered (gdb_stdlog, | |
4494 | "infrun: TARGET_WAITKIND_NO_RESUMED " | |
4495 | "(ignoring: bg)\n"); | |
4496 | prepare_to_wait (ecs); | |
4497 | return 1; | |
4498 | } | |
f4836ba9 PA |
4499 | } |
4500 | ||
4501 | /* Otherwise, if we were running a synchronous execution command, we | |
4502 | may need to cancel it and give the user back the terminal. | |
4503 | ||
4504 | In non-stop mode, the target can't tell whether we've already | |
4505 | consumed previous stop events, so it can end up sending us a | |
4506 | no-resumed event like so: | |
4507 | ||
4508 | #0 - thread 1 is left stopped | |
4509 | ||
4510 | #1 - thread 2 is resumed and hits breakpoint | |
4511 | -> TARGET_WAITKIND_STOPPED | |
4512 | ||
4513 | #2 - thread 3 is resumed and exits | |
4514 | this is the last resumed thread, so | |
4515 | -> TARGET_WAITKIND_NO_RESUMED | |
4516 | ||
4517 | #3 - gdb processes stop for thread 2 and decides to re-resume | |
4518 | it. | |
4519 | ||
4520 | #4 - gdb processes the TARGET_WAITKIND_NO_RESUMED event. | |
4521 | thread 2 is now resumed, so the event should be ignored. | |
4522 | ||
4523 | IOW, if the stop for thread 2 doesn't end a foreground command, | |
4524 | then we need to ignore the following TARGET_WAITKIND_NO_RESUMED | |
4525 | event. But it could be that the event meant that thread 2 itself | |
4526 | (or whatever other thread was the last resumed thread) exited. | |
4527 | ||
4528 | To address this we refresh the thread list and check whether we | |
4529 | have resumed threads _now_. In the example above, this removes | |
4530 | thread 3 from the thread list. If thread 2 was re-resumed, we | |
4531 | ignore this event. If we find no thread resumed, then we cancel | |
4532 | the synchronous command show "no unwaited-for " to the user. */ | |
4533 | update_thread_list (); | |
4534 | ||
08036331 | 4535 | for (thread_info *thread : all_non_exited_threads ()) |
f4836ba9 PA |
4536 | { |
4537 | if (thread->executing | |
4538 | || thread->suspend.waitstatus_pending_p) | |
4539 | { | |
4540 | /* There were no unwaited-for children left in the target at | |
4541 | some point, but there are now. Just ignore. */ | |
4542 | if (debug_infrun) | |
4543 | fprintf_unfiltered (gdb_stdlog, | |
4544 | "infrun: TARGET_WAITKIND_NO_RESUMED " | |
4545 | "(ignoring: found resumed)\n"); | |
4546 | prepare_to_wait (ecs); | |
4547 | return 1; | |
4548 | } | |
4549 | } | |
4550 | ||
4551 | /* Note however that we may find no resumed thread because the whole | |
4552 | process exited meanwhile (thus updating the thread list results | |
4553 | in an empty thread list). In this case we know we'll be getting | |
4554 | a process exit event shortly. */ | |
08036331 | 4555 | for (inferior *inf : all_inferiors ()) |
f4836ba9 PA |
4556 | { |
4557 | if (inf->pid == 0) | |
4558 | continue; | |
4559 | ||
08036331 | 4560 | thread_info *thread = any_live_thread_of_inferior (inf); |
f4836ba9 PA |
4561 | if (thread == NULL) |
4562 | { | |
4563 | if (debug_infrun) | |
4564 | fprintf_unfiltered (gdb_stdlog, | |
4565 | "infrun: TARGET_WAITKIND_NO_RESUMED " | |
4566 | "(expect process exit)\n"); | |
4567 | prepare_to_wait (ecs); | |
4568 | return 1; | |
4569 | } | |
4570 | } | |
4571 | ||
4572 | /* Go ahead and report the event. */ | |
4573 | return 0; | |
4574 | } | |
4575 | ||
05ba8510 PA |
4576 | /* Given an execution control state that has been freshly filled in by |
4577 | an event from the inferior, figure out what it means and take | |
4578 | appropriate action. | |
4579 | ||
4580 | The alternatives are: | |
4581 | ||
22bcd14b | 4582 | 1) stop_waiting and return; to really stop and return to the |
05ba8510 PA |
4583 | debugger. |
4584 | ||
4585 | 2) keep_going and return; to wait for the next event (set | |
4586 | ecs->event_thread->stepping_over_breakpoint to 1 to single step | |
4587 | once). */ | |
c906108c | 4588 | |
ec9499be | 4589 | static void |
595915c1 | 4590 | handle_inferior_event (struct execution_control_state *ecs) |
cd0fc7c3 | 4591 | { |
595915c1 TT |
4592 | /* Make sure that all temporary struct value objects that were |
4593 | created during the handling of the event get deleted at the | |
4594 | end. */ | |
4595 | scoped_value_mark free_values; | |
4596 | ||
d6b48e9c PA |
4597 | enum stop_kind stop_soon; |
4598 | ||
c29705b7 PW |
4599 | if (debug_infrun) |
4600 | fprintf_unfiltered (gdb_stdlog, "infrun: handle_inferior_event %s\n", | |
4601 | target_waitstatus_to_string (&ecs->ws).c_str ()); | |
4602 | ||
28736962 PA |
4603 | if (ecs->ws.kind == TARGET_WAITKIND_IGNORE) |
4604 | { | |
4605 | /* We had an event in the inferior, but we are not interested in | |
4606 | handling it at this level. The lower layers have already | |
4607 | done what needs to be done, if anything. | |
4608 | ||
4609 | One of the possible circumstances for this is when the | |
4610 | inferior produces output for the console. The inferior has | |
4611 | not stopped, and we are ignoring the event. Another possible | |
4612 | circumstance is any event which the lower level knows will be | |
4613 | reported multiple times without an intervening resume. */ | |
28736962 PA |
4614 | prepare_to_wait (ecs); |
4615 | return; | |
4616 | } | |
4617 | ||
65706a29 PA |
4618 | if (ecs->ws.kind == TARGET_WAITKIND_THREAD_EXITED) |
4619 | { | |
65706a29 PA |
4620 | prepare_to_wait (ecs); |
4621 | return; | |
4622 | } | |
4623 | ||
0e5bf2a8 | 4624 | if (ecs->ws.kind == TARGET_WAITKIND_NO_RESUMED |
f4836ba9 PA |
4625 | && handle_no_resumed (ecs)) |
4626 | return; | |
0e5bf2a8 | 4627 | |
1777feb0 | 4628 | /* Cache the last pid/waitstatus. */ |
c32c64b7 | 4629 | set_last_target_status (ecs->ptid, ecs->ws); |
e02bc4cc | 4630 | |
ca005067 | 4631 | /* Always clear state belonging to the previous time we stopped. */ |
aa7d318d | 4632 | stop_stack_dummy = STOP_NONE; |
ca005067 | 4633 | |
0e5bf2a8 PA |
4634 | if (ecs->ws.kind == TARGET_WAITKIND_NO_RESUMED) |
4635 | { | |
4636 | /* No unwaited-for children left. IOW, all resumed children | |
4637 | have exited. */ | |
0e5bf2a8 | 4638 | stop_print_frame = 0; |
22bcd14b | 4639 | stop_waiting (ecs); |
0e5bf2a8 PA |
4640 | return; |
4641 | } | |
4642 | ||
8c90c137 | 4643 | if (ecs->ws.kind != TARGET_WAITKIND_EXITED |
64776a0b | 4644 | && ecs->ws.kind != TARGET_WAITKIND_SIGNALLED) |
359f5fe6 PA |
4645 | { |
4646 | ecs->event_thread = find_thread_ptid (ecs->ptid); | |
4647 | /* If it's a new thread, add it to the thread database. */ | |
4648 | if (ecs->event_thread == NULL) | |
4649 | ecs->event_thread = add_thread (ecs->ptid); | |
c1e36e3e PA |
4650 | |
4651 | /* Disable range stepping. If the next step request could use a | |
4652 | range, this will be end up re-enabled then. */ | |
4653 | ecs->event_thread->control.may_range_step = 0; | |
359f5fe6 | 4654 | } |
88ed393a JK |
4655 | |
4656 | /* Dependent on valid ECS->EVENT_THREAD. */ | |
d8dd4d5f | 4657 | adjust_pc_after_break (ecs->event_thread, &ecs->ws); |
88ed393a JK |
4658 | |
4659 | /* Dependent on the current PC value modified by adjust_pc_after_break. */ | |
4660 | reinit_frame_cache (); | |
4661 | ||
28736962 PA |
4662 | breakpoint_retire_moribund (); |
4663 | ||
2b009048 DJ |
4664 | /* First, distinguish signals caused by the debugger from signals |
4665 | that have to do with the program's own actions. Note that | |
4666 | breakpoint insns may cause SIGTRAP or SIGILL or SIGEMT, depending | |
4667 | on the operating system version. Here we detect when a SIGILL or | |
4668 | SIGEMT is really a breakpoint and change it to SIGTRAP. We do | |
4669 | something similar for SIGSEGV, since a SIGSEGV will be generated | |
4670 | when we're trying to execute a breakpoint instruction on a | |
4671 | non-executable stack. This happens for call dummy breakpoints | |
4672 | for architectures like SPARC that place call dummies on the | |
4673 | stack. */ | |
2b009048 | 4674 | if (ecs->ws.kind == TARGET_WAITKIND_STOPPED |
a493e3e2 PA |
4675 | && (ecs->ws.value.sig == GDB_SIGNAL_ILL |
4676 | || ecs->ws.value.sig == GDB_SIGNAL_SEGV | |
4677 | || ecs->ws.value.sig == GDB_SIGNAL_EMT)) | |
2b009048 | 4678 | { |
00431a78 | 4679 | struct regcache *regcache = get_thread_regcache (ecs->event_thread); |
de0a0249 | 4680 | |
a01bda52 | 4681 | if (breakpoint_inserted_here_p (regcache->aspace (), |
de0a0249 UW |
4682 | regcache_read_pc (regcache))) |
4683 | { | |
4684 | if (debug_infrun) | |
4685 | fprintf_unfiltered (gdb_stdlog, | |
4686 | "infrun: Treating signal as SIGTRAP\n"); | |
a493e3e2 | 4687 | ecs->ws.value.sig = GDB_SIGNAL_TRAP; |
de0a0249 | 4688 | } |
2b009048 DJ |
4689 | } |
4690 | ||
28736962 PA |
4691 | /* Mark the non-executing threads accordingly. In all-stop, all |
4692 | threads of all processes are stopped when we get any event | |
e1316e60 | 4693 | reported. In non-stop mode, only the event thread stops. */ |
372316f1 PA |
4694 | { |
4695 | ptid_t mark_ptid; | |
4696 | ||
fbea99ea | 4697 | if (!target_is_non_stop_p ()) |
372316f1 PA |
4698 | mark_ptid = minus_one_ptid; |
4699 | else if (ecs->ws.kind == TARGET_WAITKIND_SIGNALLED | |
4700 | || ecs->ws.kind == TARGET_WAITKIND_EXITED) | |
4701 | { | |
4702 | /* If we're handling a process exit in non-stop mode, even | |
4703 | though threads haven't been deleted yet, one would think | |
4704 | that there is nothing to do, as threads of the dead process | |
4705 | will be soon deleted, and threads of any other process were | |
4706 | left running. However, on some targets, threads survive a | |
4707 | process exit event. E.g., for the "checkpoint" command, | |
4708 | when the current checkpoint/fork exits, linux-fork.c | |
4709 | automatically switches to another fork from within | |
4710 | target_mourn_inferior, by associating the same | |
4711 | inferior/thread to another fork. We haven't mourned yet at | |
4712 | this point, but we must mark any threads left in the | |
4713 | process as not-executing so that finish_thread_state marks | |
4714 | them stopped (in the user's perspective) if/when we present | |
4715 | the stop to the user. */ | |
e99b03dc | 4716 | mark_ptid = ptid_t (ecs->ptid.pid ()); |
372316f1 PA |
4717 | } |
4718 | else | |
4719 | mark_ptid = ecs->ptid; | |
4720 | ||
4721 | set_executing (mark_ptid, 0); | |
4722 | ||
4723 | /* Likewise the resumed flag. */ | |
4724 | set_resumed (mark_ptid, 0); | |
4725 | } | |
8c90c137 | 4726 | |
488f131b JB |
4727 | switch (ecs->ws.kind) |
4728 | { | |
4729 | case TARGET_WAITKIND_LOADED: | |
00431a78 | 4730 | context_switch (ecs); |
b0f4b84b DJ |
4731 | /* Ignore gracefully during startup of the inferior, as it might |
4732 | be the shell which has just loaded some objects, otherwise | |
4733 | add the symbols for the newly loaded objects. Also ignore at | |
4734 | the beginning of an attach or remote session; we will query | |
4735 | the full list of libraries once the connection is | |
4736 | established. */ | |
4f5d7f63 | 4737 | |
00431a78 | 4738 | stop_soon = get_inferior_stop_soon (ecs); |
c0236d92 | 4739 | if (stop_soon == NO_STOP_QUIETLY) |
488f131b | 4740 | { |
edcc5120 TT |
4741 | struct regcache *regcache; |
4742 | ||
00431a78 | 4743 | regcache = get_thread_regcache (ecs->event_thread); |
edcc5120 TT |
4744 | |
4745 | handle_solib_event (); | |
4746 | ||
4747 | ecs->event_thread->control.stop_bpstat | |
a01bda52 | 4748 | = bpstat_stop_status (regcache->aspace (), |
f2ffa92b PA |
4749 | ecs->event_thread->suspend.stop_pc, |
4750 | ecs->event_thread, &ecs->ws); | |
ab04a2af | 4751 | |
c65d6b55 PA |
4752 | if (handle_stop_requested (ecs)) |
4753 | return; | |
4754 | ||
ce12b012 | 4755 | if (bpstat_causes_stop (ecs->event_thread->control.stop_bpstat)) |
edcc5120 TT |
4756 | { |
4757 | /* A catchpoint triggered. */ | |
94c57d6a PA |
4758 | process_event_stop_test (ecs); |
4759 | return; | |
edcc5120 | 4760 | } |
488f131b | 4761 | |
b0f4b84b DJ |
4762 | /* If requested, stop when the dynamic linker notifies |
4763 | gdb of events. This allows the user to get control | |
4764 | and place breakpoints in initializer routines for | |
4765 | dynamically loaded objects (among other things). */ | |
a493e3e2 | 4766 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; |
b0f4b84b DJ |
4767 | if (stop_on_solib_events) |
4768 | { | |
55409f9d DJ |
4769 | /* Make sure we print "Stopped due to solib-event" in |
4770 | normal_stop. */ | |
4771 | stop_print_frame = 1; | |
4772 | ||
22bcd14b | 4773 | stop_waiting (ecs); |
b0f4b84b DJ |
4774 | return; |
4775 | } | |
488f131b | 4776 | } |
b0f4b84b DJ |
4777 | |
4778 | /* If we are skipping through a shell, or through shared library | |
4779 | loading that we aren't interested in, resume the program. If | |
5c09a2c5 | 4780 | we're running the program normally, also resume. */ |
b0f4b84b DJ |
4781 | if (stop_soon == STOP_QUIETLY || stop_soon == NO_STOP_QUIETLY) |
4782 | { | |
74960c60 VP |
4783 | /* Loading of shared libraries might have changed breakpoint |
4784 | addresses. Make sure new breakpoints are inserted. */ | |
a25a5a45 | 4785 | if (stop_soon == NO_STOP_QUIETLY) |
74960c60 | 4786 | insert_breakpoints (); |
64ce06e4 | 4787 | resume (GDB_SIGNAL_0); |
b0f4b84b DJ |
4788 | prepare_to_wait (ecs); |
4789 | return; | |
4790 | } | |
4791 | ||
5c09a2c5 PA |
4792 | /* But stop if we're attaching or setting up a remote |
4793 | connection. */ | |
4794 | if (stop_soon == STOP_QUIETLY_NO_SIGSTOP | |
4795 | || stop_soon == STOP_QUIETLY_REMOTE) | |
4796 | { | |
4797 | if (debug_infrun) | |
4798 | fprintf_unfiltered (gdb_stdlog, "infrun: quietly stopped\n"); | |
22bcd14b | 4799 | stop_waiting (ecs); |
5c09a2c5 PA |
4800 | return; |
4801 | } | |
4802 | ||
4803 | internal_error (__FILE__, __LINE__, | |
4804 | _("unhandled stop_soon: %d"), (int) stop_soon); | |
c5aa993b | 4805 | |
488f131b | 4806 | case TARGET_WAITKIND_SPURIOUS: |
c65d6b55 PA |
4807 | if (handle_stop_requested (ecs)) |
4808 | return; | |
00431a78 | 4809 | context_switch (ecs); |
64ce06e4 | 4810 | resume (GDB_SIGNAL_0); |
488f131b JB |
4811 | prepare_to_wait (ecs); |
4812 | return; | |
c5aa993b | 4813 | |
65706a29 | 4814 | case TARGET_WAITKIND_THREAD_CREATED: |
c65d6b55 PA |
4815 | if (handle_stop_requested (ecs)) |
4816 | return; | |
00431a78 | 4817 | context_switch (ecs); |
65706a29 PA |
4818 | if (!switch_back_to_stepped_thread (ecs)) |
4819 | keep_going (ecs); | |
4820 | return; | |
4821 | ||
488f131b | 4822 | case TARGET_WAITKIND_EXITED: |
940c3c06 | 4823 | case TARGET_WAITKIND_SIGNALLED: |
fb66883a | 4824 | inferior_ptid = ecs->ptid; |
c9657e70 | 4825 | set_current_inferior (find_inferior_ptid (ecs->ptid)); |
6c95b8df PA |
4826 | set_current_program_space (current_inferior ()->pspace); |
4827 | handle_vfork_child_exec_or_exit (0); | |
223ffa71 | 4828 | target_terminal::ours (); /* Must do this before mourn anyway. */ |
488f131b | 4829 | |
0c557179 SDJ |
4830 | /* Clearing any previous state of convenience variables. */ |
4831 | clear_exit_convenience_vars (); | |
4832 | ||
940c3c06 PA |
4833 | if (ecs->ws.kind == TARGET_WAITKIND_EXITED) |
4834 | { | |
4835 | /* Record the exit code in the convenience variable $_exitcode, so | |
4836 | that the user can inspect this again later. */ | |
4837 | set_internalvar_integer (lookup_internalvar ("_exitcode"), | |
4838 | (LONGEST) ecs->ws.value.integer); | |
4839 | ||
4840 | /* Also record this in the inferior itself. */ | |
4841 | current_inferior ()->has_exit_code = 1; | |
4842 | current_inferior ()->exit_code = (LONGEST) ecs->ws.value.integer; | |
8cf64490 | 4843 | |
98eb56a4 PA |
4844 | /* Support the --return-child-result option. */ |
4845 | return_child_result_value = ecs->ws.value.integer; | |
4846 | ||
76727919 | 4847 | gdb::observers::exited.notify (ecs->ws.value.integer); |
940c3c06 PA |
4848 | } |
4849 | else | |
0c557179 | 4850 | { |
00431a78 | 4851 | struct gdbarch *gdbarch = current_inferior ()->gdbarch; |
0c557179 SDJ |
4852 | |
4853 | if (gdbarch_gdb_signal_to_target_p (gdbarch)) | |
4854 | { | |
4855 | /* Set the value of the internal variable $_exitsignal, | |
4856 | which holds the signal uncaught by the inferior. */ | |
4857 | set_internalvar_integer (lookup_internalvar ("_exitsignal"), | |
4858 | gdbarch_gdb_signal_to_target (gdbarch, | |
4859 | ecs->ws.value.sig)); | |
4860 | } | |
4861 | else | |
4862 | { | |
4863 | /* We don't have access to the target's method used for | |
4864 | converting between signal numbers (GDB's internal | |
4865 | representation <-> target's representation). | |
4866 | Therefore, we cannot do a good job at displaying this | |
4867 | information to the user. It's better to just warn | |
4868 | her about it (if infrun debugging is enabled), and | |
4869 | give up. */ | |
4870 | if (debug_infrun) | |
4871 | fprintf_filtered (gdb_stdlog, _("\ | |
4872 | Cannot fill $_exitsignal with the correct signal number.\n")); | |
4873 | } | |
4874 | ||
76727919 | 4875 | gdb::observers::signal_exited.notify (ecs->ws.value.sig); |
0c557179 | 4876 | } |
8cf64490 | 4877 | |
488f131b | 4878 | gdb_flush (gdb_stdout); |
bc1e6c81 | 4879 | target_mourn_inferior (inferior_ptid); |
488f131b | 4880 | stop_print_frame = 0; |
22bcd14b | 4881 | stop_waiting (ecs); |
488f131b | 4882 | return; |
c5aa993b | 4883 | |
488f131b | 4884 | /* The following are the only cases in which we keep going; |
1777feb0 | 4885 | the above cases end in a continue or goto. */ |
488f131b | 4886 | case TARGET_WAITKIND_FORKED: |
deb3b17b | 4887 | case TARGET_WAITKIND_VFORKED: |
e2d96639 YQ |
4888 | /* Check whether the inferior is displaced stepping. */ |
4889 | { | |
00431a78 | 4890 | struct regcache *regcache = get_thread_regcache (ecs->event_thread); |
ac7936df | 4891 | struct gdbarch *gdbarch = regcache->arch (); |
e2d96639 YQ |
4892 | |
4893 | /* If checking displaced stepping is supported, and thread | |
4894 | ecs->ptid is displaced stepping. */ | |
00431a78 | 4895 | if (displaced_step_in_progress_thread (ecs->event_thread)) |
e2d96639 YQ |
4896 | { |
4897 | struct inferior *parent_inf | |
c9657e70 | 4898 | = find_inferior_ptid (ecs->ptid); |
e2d96639 YQ |
4899 | struct regcache *child_regcache; |
4900 | CORE_ADDR parent_pc; | |
4901 | ||
4902 | /* GDB has got TARGET_WAITKIND_FORKED or TARGET_WAITKIND_VFORKED, | |
4903 | indicating that the displaced stepping of syscall instruction | |
4904 | has been done. Perform cleanup for parent process here. Note | |
4905 | that this operation also cleans up the child process for vfork, | |
4906 | because their pages are shared. */ | |
00431a78 | 4907 | displaced_step_fixup (ecs->event_thread, GDB_SIGNAL_TRAP); |
c2829269 PA |
4908 | /* Start a new step-over in another thread if there's one |
4909 | that needs it. */ | |
4910 | start_step_over (); | |
e2d96639 YQ |
4911 | |
4912 | if (ecs->ws.kind == TARGET_WAITKIND_FORKED) | |
4913 | { | |
c0987663 | 4914 | struct displaced_step_inferior_state *displaced |
00431a78 | 4915 | = get_displaced_stepping_state (parent_inf); |
c0987663 | 4916 | |
e2d96639 YQ |
4917 | /* Restore scratch pad for child process. */ |
4918 | displaced_step_restore (displaced, ecs->ws.value.related_pid); | |
4919 | } | |
4920 | ||
4921 | /* Since the vfork/fork syscall instruction was executed in the scratchpad, | |
4922 | the child's PC is also within the scratchpad. Set the child's PC | |
4923 | to the parent's PC value, which has already been fixed up. | |
4924 | FIXME: we use the parent's aspace here, although we're touching | |
4925 | the child, because the child hasn't been added to the inferior | |
4926 | list yet at this point. */ | |
4927 | ||
4928 | child_regcache | |
4929 | = get_thread_arch_aspace_regcache (ecs->ws.value.related_pid, | |
4930 | gdbarch, | |
4931 | parent_inf->aspace); | |
4932 | /* Read PC value of parent process. */ | |
4933 | parent_pc = regcache_read_pc (regcache); | |
4934 | ||
4935 | if (debug_displaced) | |
4936 | fprintf_unfiltered (gdb_stdlog, | |
4937 | "displaced: write child pc from %s to %s\n", | |
4938 | paddress (gdbarch, | |
4939 | regcache_read_pc (child_regcache)), | |
4940 | paddress (gdbarch, parent_pc)); | |
4941 | ||
4942 | regcache_write_pc (child_regcache, parent_pc); | |
4943 | } | |
4944 | } | |
4945 | ||
00431a78 | 4946 | context_switch (ecs); |
5a2901d9 | 4947 | |
b242c3c2 PA |
4948 | /* Immediately detach breakpoints from the child before there's |
4949 | any chance of letting the user delete breakpoints from the | |
4950 | breakpoint lists. If we don't do this early, it's easy to | |
4951 | leave left over traps in the child, vis: "break foo; catch | |
4952 | fork; c; <fork>; del; c; <child calls foo>". We only follow | |
4953 | the fork on the last `continue', and by that time the | |
4954 | breakpoint at "foo" is long gone from the breakpoint table. | |
4955 | If we vforked, then we don't need to unpatch here, since both | |
4956 | parent and child are sharing the same memory pages; we'll | |
4957 | need to unpatch at follow/detach time instead to be certain | |
4958 | that new breakpoints added between catchpoint hit time and | |
4959 | vfork follow are detached. */ | |
4960 | if (ecs->ws.kind != TARGET_WAITKIND_VFORKED) | |
4961 | { | |
b242c3c2 PA |
4962 | /* This won't actually modify the breakpoint list, but will |
4963 | physically remove the breakpoints from the child. */ | |
d80ee84f | 4964 | detach_breakpoints (ecs->ws.value.related_pid); |
b242c3c2 PA |
4965 | } |
4966 | ||
34b7e8a6 | 4967 | delete_just_stopped_threads_single_step_breakpoints (); |
d03285ec | 4968 | |
e58b0e63 PA |
4969 | /* In case the event is caught by a catchpoint, remember that |
4970 | the event is to be followed at the next resume of the thread, | |
4971 | and not immediately. */ | |
4972 | ecs->event_thread->pending_follow = ecs->ws; | |
4973 | ||
f2ffa92b PA |
4974 | ecs->event_thread->suspend.stop_pc |
4975 | = regcache_read_pc (get_thread_regcache (ecs->event_thread)); | |
675bf4cb | 4976 | |
16c381f0 | 4977 | ecs->event_thread->control.stop_bpstat |
a01bda52 | 4978 | = bpstat_stop_status (get_current_regcache ()->aspace (), |
f2ffa92b PA |
4979 | ecs->event_thread->suspend.stop_pc, |
4980 | ecs->event_thread, &ecs->ws); | |
675bf4cb | 4981 | |
c65d6b55 PA |
4982 | if (handle_stop_requested (ecs)) |
4983 | return; | |
4984 | ||
ce12b012 PA |
4985 | /* If no catchpoint triggered for this, then keep going. Note |
4986 | that we're interested in knowing the bpstat actually causes a | |
4987 | stop, not just if it may explain the signal. Software | |
4988 | watchpoints, for example, always appear in the bpstat. */ | |
4989 | if (!bpstat_causes_stop (ecs->event_thread->control.stop_bpstat)) | |
04e68871 | 4990 | { |
e58b0e63 | 4991 | int should_resume; |
3e43a32a MS |
4992 | int follow_child |
4993 | = (follow_fork_mode_string == follow_fork_mode_child); | |
e58b0e63 | 4994 | |
a493e3e2 | 4995 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; |
e58b0e63 PA |
4996 | |
4997 | should_resume = follow_fork (); | |
4998 | ||
00431a78 PA |
4999 | thread_info *parent = ecs->event_thread; |
5000 | thread_info *child = find_thread_ptid (ecs->ws.value.related_pid); | |
6c95b8df | 5001 | |
a2077e25 PA |
5002 | /* At this point, the parent is marked running, and the |
5003 | child is marked stopped. */ | |
5004 | ||
5005 | /* If not resuming the parent, mark it stopped. */ | |
5006 | if (follow_child && !detach_fork && !non_stop && !sched_multi) | |
00431a78 | 5007 | parent->set_running (false); |
a2077e25 PA |
5008 | |
5009 | /* If resuming the child, mark it running. */ | |
5010 | if (follow_child || (!detach_fork && (non_stop || sched_multi))) | |
00431a78 | 5011 | child->set_running (true); |
a2077e25 | 5012 | |
6c95b8df | 5013 | /* In non-stop mode, also resume the other branch. */ |
fbea99ea PA |
5014 | if (!detach_fork && (non_stop |
5015 | || (sched_multi && target_is_non_stop_p ()))) | |
6c95b8df PA |
5016 | { |
5017 | if (follow_child) | |
5018 | switch_to_thread (parent); | |
5019 | else | |
5020 | switch_to_thread (child); | |
5021 | ||
5022 | ecs->event_thread = inferior_thread (); | |
5023 | ecs->ptid = inferior_ptid; | |
5024 | keep_going (ecs); | |
5025 | } | |
5026 | ||
5027 | if (follow_child) | |
5028 | switch_to_thread (child); | |
5029 | else | |
5030 | switch_to_thread (parent); | |
5031 | ||
e58b0e63 PA |
5032 | ecs->event_thread = inferior_thread (); |
5033 | ecs->ptid = inferior_ptid; | |
5034 | ||
5035 | if (should_resume) | |
5036 | keep_going (ecs); | |
5037 | else | |
22bcd14b | 5038 | stop_waiting (ecs); |
04e68871 DJ |
5039 | return; |
5040 | } | |
94c57d6a PA |
5041 | process_event_stop_test (ecs); |
5042 | return; | |
488f131b | 5043 | |
6c95b8df PA |
5044 | case TARGET_WAITKIND_VFORK_DONE: |
5045 | /* Done with the shared memory region. Re-insert breakpoints in | |
5046 | the parent, and keep going. */ | |
5047 | ||
00431a78 | 5048 | context_switch (ecs); |
6c95b8df PA |
5049 | |
5050 | current_inferior ()->waiting_for_vfork_done = 0; | |
56710373 | 5051 | current_inferior ()->pspace->breakpoints_not_allowed = 0; |
c65d6b55 PA |
5052 | |
5053 | if (handle_stop_requested (ecs)) | |
5054 | return; | |
5055 | ||
6c95b8df PA |
5056 | /* This also takes care of reinserting breakpoints in the |
5057 | previously locked inferior. */ | |
5058 | keep_going (ecs); | |
5059 | return; | |
5060 | ||
488f131b | 5061 | case TARGET_WAITKIND_EXECD: |
488f131b | 5062 | |
cbd2b4e3 PA |
5063 | /* Note we can't read registers yet (the stop_pc), because we |
5064 | don't yet know the inferior's post-exec architecture. | |
5065 | 'stop_pc' is explicitly read below instead. */ | |
00431a78 | 5066 | switch_to_thread_no_regs (ecs->event_thread); |
5a2901d9 | 5067 | |
6c95b8df PA |
5068 | /* Do whatever is necessary to the parent branch of the vfork. */ |
5069 | handle_vfork_child_exec_or_exit (1); | |
5070 | ||
795e548f PA |
5071 | /* This causes the eventpoints and symbol table to be reset. |
5072 | Must do this now, before trying to determine whether to | |
5073 | stop. */ | |
71b43ef8 | 5074 | follow_exec (inferior_ptid, ecs->ws.value.execd_pathname); |
795e548f | 5075 | |
17d8546e DB |
5076 | /* In follow_exec we may have deleted the original thread and |
5077 | created a new one. Make sure that the event thread is the | |
5078 | execd thread for that case (this is a nop otherwise). */ | |
5079 | ecs->event_thread = inferior_thread (); | |
5080 | ||
f2ffa92b PA |
5081 | ecs->event_thread->suspend.stop_pc |
5082 | = regcache_read_pc (get_thread_regcache (ecs->event_thread)); | |
ecdc3a72 | 5083 | |
16c381f0 | 5084 | ecs->event_thread->control.stop_bpstat |
a01bda52 | 5085 | = bpstat_stop_status (get_current_regcache ()->aspace (), |
f2ffa92b PA |
5086 | ecs->event_thread->suspend.stop_pc, |
5087 | ecs->event_thread, &ecs->ws); | |
795e548f | 5088 | |
71b43ef8 PA |
5089 | /* Note that this may be referenced from inside |
5090 | bpstat_stop_status above, through inferior_has_execd. */ | |
5091 | xfree (ecs->ws.value.execd_pathname); | |
5092 | ecs->ws.value.execd_pathname = NULL; | |
5093 | ||
c65d6b55 PA |
5094 | if (handle_stop_requested (ecs)) |
5095 | return; | |
5096 | ||
04e68871 | 5097 | /* If no catchpoint triggered for this, then keep going. */ |
ce12b012 | 5098 | if (!bpstat_causes_stop (ecs->event_thread->control.stop_bpstat)) |
04e68871 | 5099 | { |
a493e3e2 | 5100 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; |
04e68871 DJ |
5101 | keep_going (ecs); |
5102 | return; | |
5103 | } | |
94c57d6a PA |
5104 | process_event_stop_test (ecs); |
5105 | return; | |
488f131b | 5106 | |
b4dc5ffa MK |
5107 | /* Be careful not to try to gather much state about a thread |
5108 | that's in a syscall. It's frequently a losing proposition. */ | |
488f131b | 5109 | case TARGET_WAITKIND_SYSCALL_ENTRY: |
1777feb0 | 5110 | /* Getting the current syscall number. */ |
94c57d6a PA |
5111 | if (handle_syscall_event (ecs) == 0) |
5112 | process_event_stop_test (ecs); | |
5113 | return; | |
c906108c | 5114 | |
488f131b JB |
5115 | /* Before examining the threads further, step this thread to |
5116 | get it entirely out of the syscall. (We get notice of the | |
5117 | event when the thread is just on the verge of exiting a | |
5118 | syscall. Stepping one instruction seems to get it back | |
b4dc5ffa | 5119 | into user code.) */ |
488f131b | 5120 | case TARGET_WAITKIND_SYSCALL_RETURN: |
94c57d6a PA |
5121 | if (handle_syscall_event (ecs) == 0) |
5122 | process_event_stop_test (ecs); | |
5123 | return; | |
c906108c | 5124 | |
488f131b | 5125 | case TARGET_WAITKIND_STOPPED: |
4f5d7f63 PA |
5126 | handle_signal_stop (ecs); |
5127 | return; | |
c906108c | 5128 | |
b2175913 MS |
5129 | case TARGET_WAITKIND_NO_HISTORY: |
5130 | /* Reverse execution: target ran out of history info. */ | |
eab402df | 5131 | |
d1988021 | 5132 | /* Switch to the stopped thread. */ |
00431a78 | 5133 | context_switch (ecs); |
d1988021 MM |
5134 | if (debug_infrun) |
5135 | fprintf_unfiltered (gdb_stdlog, "infrun: stopped\n"); | |
5136 | ||
34b7e8a6 | 5137 | delete_just_stopped_threads_single_step_breakpoints (); |
f2ffa92b PA |
5138 | ecs->event_thread->suspend.stop_pc |
5139 | = regcache_read_pc (get_thread_regcache (inferior_thread ())); | |
c65d6b55 PA |
5140 | |
5141 | if (handle_stop_requested (ecs)) | |
5142 | return; | |
5143 | ||
76727919 | 5144 | gdb::observers::no_history.notify (); |
22bcd14b | 5145 | stop_waiting (ecs); |
b2175913 | 5146 | return; |
488f131b | 5147 | } |
4f5d7f63 PA |
5148 | } |
5149 | ||
372316f1 PA |
5150 | /* Restart threads back to what they were trying to do back when we |
5151 | paused them for an in-line step-over. The EVENT_THREAD thread is | |
5152 | ignored. */ | |
4d9d9d04 PA |
5153 | |
5154 | static void | |
372316f1 PA |
5155 | restart_threads (struct thread_info *event_thread) |
5156 | { | |
372316f1 PA |
5157 | /* In case the instruction just stepped spawned a new thread. */ |
5158 | update_thread_list (); | |
5159 | ||
08036331 | 5160 | for (thread_info *tp : all_non_exited_threads ()) |
372316f1 PA |
5161 | { |
5162 | if (tp == event_thread) | |
5163 | { | |
5164 | if (debug_infrun) | |
5165 | fprintf_unfiltered (gdb_stdlog, | |
5166 | "infrun: restart threads: " | |
5167 | "[%s] is event thread\n", | |
a068643d | 5168 | target_pid_to_str (tp->ptid).c_str ()); |
372316f1 PA |
5169 | continue; |
5170 | } | |
5171 | ||
5172 | if (!(tp->state == THREAD_RUNNING || tp->control.in_infcall)) | |
5173 | { | |
5174 | if (debug_infrun) | |
5175 | fprintf_unfiltered (gdb_stdlog, | |
5176 | "infrun: restart threads: " | |
5177 | "[%s] not meant to be running\n", | |
a068643d | 5178 | target_pid_to_str (tp->ptid).c_str ()); |
372316f1 PA |
5179 | continue; |
5180 | } | |
5181 | ||
5182 | if (tp->resumed) | |
5183 | { | |
5184 | if (debug_infrun) | |
5185 | fprintf_unfiltered (gdb_stdlog, | |
5186 | "infrun: restart threads: [%s] resumed\n", | |
a068643d | 5187 | target_pid_to_str (tp->ptid).c_str ()); |
372316f1 PA |
5188 | gdb_assert (tp->executing || tp->suspend.waitstatus_pending_p); |
5189 | continue; | |
5190 | } | |
5191 | ||
5192 | if (thread_is_in_step_over_chain (tp)) | |
5193 | { | |
5194 | if (debug_infrun) | |
5195 | fprintf_unfiltered (gdb_stdlog, | |
5196 | "infrun: restart threads: " | |
5197 | "[%s] needs step-over\n", | |
a068643d | 5198 | target_pid_to_str (tp->ptid).c_str ()); |
372316f1 PA |
5199 | gdb_assert (!tp->resumed); |
5200 | continue; | |
5201 | } | |
5202 | ||
5203 | ||
5204 | if (tp->suspend.waitstatus_pending_p) | |
5205 | { | |
5206 | if (debug_infrun) | |
5207 | fprintf_unfiltered (gdb_stdlog, | |
5208 | "infrun: restart threads: " | |
5209 | "[%s] has pending status\n", | |
a068643d | 5210 | target_pid_to_str (tp->ptid).c_str ()); |
372316f1 PA |
5211 | tp->resumed = 1; |
5212 | continue; | |
5213 | } | |
5214 | ||
c65d6b55 PA |
5215 | gdb_assert (!tp->stop_requested); |
5216 | ||
372316f1 PA |
5217 | /* If some thread needs to start a step-over at this point, it |
5218 | should still be in the step-over queue, and thus skipped | |
5219 | above. */ | |
5220 | if (thread_still_needs_step_over (tp)) | |
5221 | { | |
5222 | internal_error (__FILE__, __LINE__, | |
5223 | "thread [%s] needs a step-over, but not in " | |
5224 | "step-over queue\n", | |
a068643d | 5225 | target_pid_to_str (tp->ptid).c_str ()); |
372316f1 PA |
5226 | } |
5227 | ||
5228 | if (currently_stepping (tp)) | |
5229 | { | |
5230 | if (debug_infrun) | |
5231 | fprintf_unfiltered (gdb_stdlog, | |
5232 | "infrun: restart threads: [%s] was stepping\n", | |
a068643d | 5233 | target_pid_to_str (tp->ptid).c_str ()); |
372316f1 PA |
5234 | keep_going_stepped_thread (tp); |
5235 | } | |
5236 | else | |
5237 | { | |
5238 | struct execution_control_state ecss; | |
5239 | struct execution_control_state *ecs = &ecss; | |
5240 | ||
5241 | if (debug_infrun) | |
5242 | fprintf_unfiltered (gdb_stdlog, | |
5243 | "infrun: restart threads: [%s] continuing\n", | |
a068643d | 5244 | target_pid_to_str (tp->ptid).c_str ()); |
372316f1 | 5245 | reset_ecs (ecs, tp); |
00431a78 | 5246 | switch_to_thread (tp); |
372316f1 PA |
5247 | keep_going_pass_signal (ecs); |
5248 | } | |
5249 | } | |
5250 | } | |
5251 | ||
5252 | /* Callback for iterate_over_threads. Find a resumed thread that has | |
5253 | a pending waitstatus. */ | |
5254 | ||
5255 | static int | |
5256 | resumed_thread_with_pending_status (struct thread_info *tp, | |
5257 | void *arg) | |
5258 | { | |
5259 | return (tp->resumed | |
5260 | && tp->suspend.waitstatus_pending_p); | |
5261 | } | |
5262 | ||
5263 | /* Called when we get an event that may finish an in-line or | |
5264 | out-of-line (displaced stepping) step-over started previously. | |
5265 | Return true if the event is processed and we should go back to the | |
5266 | event loop; false if the caller should continue processing the | |
5267 | event. */ | |
5268 | ||
5269 | static int | |
4d9d9d04 PA |
5270 | finish_step_over (struct execution_control_state *ecs) |
5271 | { | |
372316f1 PA |
5272 | int had_step_over_info; |
5273 | ||
00431a78 | 5274 | displaced_step_fixup (ecs->event_thread, |
4d9d9d04 PA |
5275 | ecs->event_thread->suspend.stop_signal); |
5276 | ||
372316f1 PA |
5277 | had_step_over_info = step_over_info_valid_p (); |
5278 | ||
5279 | if (had_step_over_info) | |
4d9d9d04 PA |
5280 | { |
5281 | /* If we're stepping over a breakpoint with all threads locked, | |
5282 | then only the thread that was stepped should be reporting | |
5283 | back an event. */ | |
5284 | gdb_assert (ecs->event_thread->control.trap_expected); | |
5285 | ||
c65d6b55 | 5286 | clear_step_over_info (); |
4d9d9d04 PA |
5287 | } |
5288 | ||
fbea99ea | 5289 | if (!target_is_non_stop_p ()) |
372316f1 | 5290 | return 0; |
4d9d9d04 PA |
5291 | |
5292 | /* Start a new step-over in another thread if there's one that | |
5293 | needs it. */ | |
5294 | start_step_over (); | |
372316f1 PA |
5295 | |
5296 | /* If we were stepping over a breakpoint before, and haven't started | |
5297 | a new in-line step-over sequence, then restart all other threads | |
5298 | (except the event thread). We can't do this in all-stop, as then | |
5299 | e.g., we wouldn't be able to issue any other remote packet until | |
5300 | these other threads stop. */ | |
5301 | if (had_step_over_info && !step_over_info_valid_p ()) | |
5302 | { | |
5303 | struct thread_info *pending; | |
5304 | ||
5305 | /* If we only have threads with pending statuses, the restart | |
5306 | below won't restart any thread and so nothing re-inserts the | |
5307 | breakpoint we just stepped over. But we need it inserted | |
5308 | when we later process the pending events, otherwise if | |
5309 | another thread has a pending event for this breakpoint too, | |
5310 | we'd discard its event (because the breakpoint that | |
5311 | originally caused the event was no longer inserted). */ | |
00431a78 | 5312 | context_switch (ecs); |
372316f1 PA |
5313 | insert_breakpoints (); |
5314 | ||
5315 | restart_threads (ecs->event_thread); | |
5316 | ||
5317 | /* If we have events pending, go through handle_inferior_event | |
5318 | again, picking up a pending event at random. This avoids | |
5319 | thread starvation. */ | |
5320 | ||
5321 | /* But not if we just stepped over a watchpoint in order to let | |
5322 | the instruction execute so we can evaluate its expression. | |
5323 | The set of watchpoints that triggered is recorded in the | |
5324 | breakpoint objects themselves (see bp->watchpoint_triggered). | |
5325 | If we processed another event first, that other event could | |
5326 | clobber this info. */ | |
5327 | if (ecs->event_thread->stepping_over_watchpoint) | |
5328 | return 0; | |
5329 | ||
5330 | pending = iterate_over_threads (resumed_thread_with_pending_status, | |
5331 | NULL); | |
5332 | if (pending != NULL) | |
5333 | { | |
5334 | struct thread_info *tp = ecs->event_thread; | |
5335 | struct regcache *regcache; | |
5336 | ||
5337 | if (debug_infrun) | |
5338 | { | |
5339 | fprintf_unfiltered (gdb_stdlog, | |
5340 | "infrun: found resumed threads with " | |
5341 | "pending events, saving status\n"); | |
5342 | } | |
5343 | ||
5344 | gdb_assert (pending != tp); | |
5345 | ||
5346 | /* Record the event thread's event for later. */ | |
5347 | save_waitstatus (tp, &ecs->ws); | |
5348 | /* This was cleared early, by handle_inferior_event. Set it | |
5349 | so this pending event is considered by | |
5350 | do_target_wait. */ | |
5351 | tp->resumed = 1; | |
5352 | ||
5353 | gdb_assert (!tp->executing); | |
5354 | ||
00431a78 | 5355 | regcache = get_thread_regcache (tp); |
372316f1 PA |
5356 | tp->suspend.stop_pc = regcache_read_pc (regcache); |
5357 | ||
5358 | if (debug_infrun) | |
5359 | { | |
5360 | fprintf_unfiltered (gdb_stdlog, | |
5361 | "infrun: saved stop_pc=%s for %s " | |
5362 | "(currently_stepping=%d)\n", | |
5363 | paddress (target_gdbarch (), | |
5364 | tp->suspend.stop_pc), | |
a068643d | 5365 | target_pid_to_str (tp->ptid).c_str (), |
372316f1 PA |
5366 | currently_stepping (tp)); |
5367 | } | |
5368 | ||
5369 | /* This in-line step-over finished; clear this so we won't | |
5370 | start a new one. This is what handle_signal_stop would | |
5371 | do, if we returned false. */ | |
5372 | tp->stepping_over_breakpoint = 0; | |
5373 | ||
5374 | /* Wake up the event loop again. */ | |
5375 | mark_async_event_handler (infrun_async_inferior_event_token); | |
5376 | ||
5377 | prepare_to_wait (ecs); | |
5378 | return 1; | |
5379 | } | |
5380 | } | |
5381 | ||
5382 | return 0; | |
4d9d9d04 PA |
5383 | } |
5384 | ||
4f5d7f63 PA |
5385 | /* Come here when the program has stopped with a signal. */ |
5386 | ||
5387 | static void | |
5388 | handle_signal_stop (struct execution_control_state *ecs) | |
5389 | { | |
5390 | struct frame_info *frame; | |
5391 | struct gdbarch *gdbarch; | |
5392 | int stopped_by_watchpoint; | |
5393 | enum stop_kind stop_soon; | |
5394 | int random_signal; | |
c906108c | 5395 | |
f0407826 DE |
5396 | gdb_assert (ecs->ws.kind == TARGET_WAITKIND_STOPPED); |
5397 | ||
c65d6b55 PA |
5398 | ecs->event_thread->suspend.stop_signal = ecs->ws.value.sig; |
5399 | ||
f0407826 DE |
5400 | /* Do we need to clean up the state of a thread that has |
5401 | completed a displaced single-step? (Doing so usually affects | |
5402 | the PC, so do it here, before we set stop_pc.) */ | |
372316f1 PA |
5403 | if (finish_step_over (ecs)) |
5404 | return; | |
f0407826 DE |
5405 | |
5406 | /* If we either finished a single-step or hit a breakpoint, but | |
5407 | the user wanted this thread to be stopped, pretend we got a | |
5408 | SIG0 (generic unsignaled stop). */ | |
5409 | if (ecs->event_thread->stop_requested | |
5410 | && ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP) | |
5411 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; | |
237fc4c9 | 5412 | |
f2ffa92b PA |
5413 | ecs->event_thread->suspend.stop_pc |
5414 | = regcache_read_pc (get_thread_regcache (ecs->event_thread)); | |
488f131b | 5415 | |
527159b7 | 5416 | if (debug_infrun) |
237fc4c9 | 5417 | { |
00431a78 | 5418 | struct regcache *regcache = get_thread_regcache (ecs->event_thread); |
b926417a | 5419 | struct gdbarch *reg_gdbarch = regcache->arch (); |
2989a365 | 5420 | scoped_restore save_inferior_ptid = make_scoped_restore (&inferior_ptid); |
7f82dfc7 JK |
5421 | |
5422 | inferior_ptid = ecs->ptid; | |
5af949e3 UW |
5423 | |
5424 | fprintf_unfiltered (gdb_stdlog, "infrun: stop_pc = %s\n", | |
b926417a | 5425 | paddress (reg_gdbarch, |
f2ffa92b | 5426 | ecs->event_thread->suspend.stop_pc)); |
d92524f1 | 5427 | if (target_stopped_by_watchpoint ()) |
237fc4c9 PA |
5428 | { |
5429 | CORE_ADDR addr; | |
abbb1732 | 5430 | |
237fc4c9 PA |
5431 | fprintf_unfiltered (gdb_stdlog, "infrun: stopped by watchpoint\n"); |
5432 | ||
8b88a78e | 5433 | if (target_stopped_data_address (current_top_target (), &addr)) |
237fc4c9 | 5434 | fprintf_unfiltered (gdb_stdlog, |
5af949e3 | 5435 | "infrun: stopped data address = %s\n", |
b926417a | 5436 | paddress (reg_gdbarch, addr)); |
237fc4c9 PA |
5437 | else |
5438 | fprintf_unfiltered (gdb_stdlog, | |
5439 | "infrun: (no data address available)\n"); | |
5440 | } | |
5441 | } | |
527159b7 | 5442 | |
36fa8042 PA |
5443 | /* This is originated from start_remote(), start_inferior() and |
5444 | shared libraries hook functions. */ | |
00431a78 | 5445 | stop_soon = get_inferior_stop_soon (ecs); |
36fa8042 PA |
5446 | if (stop_soon == STOP_QUIETLY || stop_soon == STOP_QUIETLY_REMOTE) |
5447 | { | |
00431a78 | 5448 | context_switch (ecs); |
36fa8042 PA |
5449 | if (debug_infrun) |
5450 | fprintf_unfiltered (gdb_stdlog, "infrun: quietly stopped\n"); | |
5451 | stop_print_frame = 1; | |
22bcd14b | 5452 | stop_waiting (ecs); |
36fa8042 PA |
5453 | return; |
5454 | } | |
5455 | ||
36fa8042 PA |
5456 | /* This originates from attach_command(). We need to overwrite |
5457 | the stop_signal here, because some kernels don't ignore a | |
5458 | SIGSTOP in a subsequent ptrace(PTRACE_CONT,SIGSTOP) call. | |
5459 | See more comments in inferior.h. On the other hand, if we | |
5460 | get a non-SIGSTOP, report it to the user - assume the backend | |
5461 | will handle the SIGSTOP if it should show up later. | |
5462 | ||
5463 | Also consider that the attach is complete when we see a | |
5464 | SIGTRAP. Some systems (e.g. Windows), and stubs supporting | |
5465 | target extended-remote report it instead of a SIGSTOP | |
5466 | (e.g. gdbserver). We already rely on SIGTRAP being our | |
5467 | signal, so this is no exception. | |
5468 | ||
5469 | Also consider that the attach is complete when we see a | |
5470 | GDB_SIGNAL_0. In non-stop mode, GDB will explicitly tell | |
5471 | the target to stop all threads of the inferior, in case the | |
5472 | low level attach operation doesn't stop them implicitly. If | |
5473 | they weren't stopped implicitly, then the stub will report a | |
5474 | GDB_SIGNAL_0, meaning: stopped for no particular reason | |
5475 | other than GDB's request. */ | |
5476 | if (stop_soon == STOP_QUIETLY_NO_SIGSTOP | |
5477 | && (ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_STOP | |
5478 | || ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP | |
5479 | || ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_0)) | |
5480 | { | |
5481 | stop_print_frame = 1; | |
22bcd14b | 5482 | stop_waiting (ecs); |
36fa8042 PA |
5483 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; |
5484 | return; | |
5485 | } | |
5486 | ||
488f131b | 5487 | /* See if something interesting happened to the non-current thread. If |
b40c7d58 | 5488 | so, then switch to that thread. */ |
d7e15655 | 5489 | if (ecs->ptid != inferior_ptid) |
488f131b | 5490 | { |
527159b7 | 5491 | if (debug_infrun) |
8a9de0e4 | 5492 | fprintf_unfiltered (gdb_stdlog, "infrun: context switch\n"); |
527159b7 | 5493 | |
00431a78 | 5494 | context_switch (ecs); |
c5aa993b | 5495 | |
9a4105ab | 5496 | if (deprecated_context_hook) |
00431a78 | 5497 | deprecated_context_hook (ecs->event_thread->global_num); |
488f131b | 5498 | } |
c906108c | 5499 | |
568d6575 UW |
5500 | /* At this point, get hold of the now-current thread's frame. */ |
5501 | frame = get_current_frame (); | |
5502 | gdbarch = get_frame_arch (frame); | |
5503 | ||
2adfaa28 | 5504 | /* Pull the single step breakpoints out of the target. */ |
af48d08f | 5505 | if (ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP) |
488f131b | 5506 | { |
af48d08f | 5507 | struct regcache *regcache; |
af48d08f | 5508 | CORE_ADDR pc; |
2adfaa28 | 5509 | |
00431a78 | 5510 | regcache = get_thread_regcache (ecs->event_thread); |
8b86c959 YQ |
5511 | const address_space *aspace = regcache->aspace (); |
5512 | ||
af48d08f | 5513 | pc = regcache_read_pc (regcache); |
34b7e8a6 | 5514 | |
af48d08f PA |
5515 | /* However, before doing so, if this single-step breakpoint was |
5516 | actually for another thread, set this thread up for moving | |
5517 | past it. */ | |
5518 | if (!thread_has_single_step_breakpoint_here (ecs->event_thread, | |
5519 | aspace, pc)) | |
5520 | { | |
5521 | if (single_step_breakpoint_inserted_here_p (aspace, pc)) | |
2adfaa28 PA |
5522 | { |
5523 | if (debug_infrun) | |
5524 | { | |
5525 | fprintf_unfiltered (gdb_stdlog, | |
af48d08f | 5526 | "infrun: [%s] hit another thread's " |
34b7e8a6 | 5527 | "single-step breakpoint\n", |
a068643d | 5528 | target_pid_to_str (ecs->ptid).c_str ()); |
2adfaa28 | 5529 | } |
af48d08f PA |
5530 | ecs->hit_singlestep_breakpoint = 1; |
5531 | } | |
5532 | } | |
5533 | else | |
5534 | { | |
5535 | if (debug_infrun) | |
5536 | { | |
5537 | fprintf_unfiltered (gdb_stdlog, | |
5538 | "infrun: [%s] hit its " | |
5539 | "single-step breakpoint\n", | |
a068643d | 5540 | target_pid_to_str (ecs->ptid).c_str ()); |
2adfaa28 PA |
5541 | } |
5542 | } | |
488f131b | 5543 | } |
af48d08f | 5544 | delete_just_stopped_threads_single_step_breakpoints (); |
c906108c | 5545 | |
963f9c80 PA |
5546 | if (ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP |
5547 | && ecs->event_thread->control.trap_expected | |
5548 | && ecs->event_thread->stepping_over_watchpoint) | |
d983da9c DJ |
5549 | stopped_by_watchpoint = 0; |
5550 | else | |
5551 | stopped_by_watchpoint = watchpoints_triggered (&ecs->ws); | |
5552 | ||
5553 | /* If necessary, step over this watchpoint. We'll be back to display | |
5554 | it in a moment. */ | |
5555 | if (stopped_by_watchpoint | |
d92524f1 | 5556 | && (target_have_steppable_watchpoint |
568d6575 | 5557 | || gdbarch_have_nonsteppable_watchpoint (gdbarch))) |
488f131b | 5558 | { |
488f131b JB |
5559 | /* At this point, we are stopped at an instruction which has |
5560 | attempted to write to a piece of memory under control of | |
5561 | a watchpoint. The instruction hasn't actually executed | |
5562 | yet. If we were to evaluate the watchpoint expression | |
5563 | now, we would get the old value, and therefore no change | |
5564 | would seem to have occurred. | |
5565 | ||
5566 | In order to make watchpoints work `right', we really need | |
5567 | to complete the memory write, and then evaluate the | |
d983da9c DJ |
5568 | watchpoint expression. We do this by single-stepping the |
5569 | target. | |
5570 | ||
7f89fd65 | 5571 | It may not be necessary to disable the watchpoint to step over |
d983da9c DJ |
5572 | it. For example, the PA can (with some kernel cooperation) |
5573 | single step over a watchpoint without disabling the watchpoint. | |
5574 | ||
5575 | It is far more common to need to disable a watchpoint to step | |
5576 | the inferior over it. If we have non-steppable watchpoints, | |
5577 | we must disable the current watchpoint; it's simplest to | |
963f9c80 PA |
5578 | disable all watchpoints. |
5579 | ||
5580 | Any breakpoint at PC must also be stepped over -- if there's | |
5581 | one, it will have already triggered before the watchpoint | |
5582 | triggered, and we either already reported it to the user, or | |
5583 | it didn't cause a stop and we called keep_going. In either | |
5584 | case, if there was a breakpoint at PC, we must be trying to | |
5585 | step past it. */ | |
5586 | ecs->event_thread->stepping_over_watchpoint = 1; | |
5587 | keep_going (ecs); | |
488f131b JB |
5588 | return; |
5589 | } | |
5590 | ||
4e1c45ea | 5591 | ecs->event_thread->stepping_over_breakpoint = 0; |
963f9c80 | 5592 | ecs->event_thread->stepping_over_watchpoint = 0; |
16c381f0 JK |
5593 | bpstat_clear (&ecs->event_thread->control.stop_bpstat); |
5594 | ecs->event_thread->control.stop_step = 0; | |
488f131b | 5595 | stop_print_frame = 1; |
488f131b | 5596 | stopped_by_random_signal = 0; |
ddfe970e | 5597 | bpstat stop_chain = NULL; |
488f131b | 5598 | |
edb3359d DJ |
5599 | /* Hide inlined functions starting here, unless we just performed stepi or |
5600 | nexti. After stepi and nexti, always show the innermost frame (not any | |
5601 | inline function call sites). */ | |
16c381f0 | 5602 | if (ecs->event_thread->control.step_range_end != 1) |
0574c78f | 5603 | { |
00431a78 PA |
5604 | const address_space *aspace |
5605 | = get_thread_regcache (ecs->event_thread)->aspace (); | |
0574c78f GB |
5606 | |
5607 | /* skip_inline_frames is expensive, so we avoid it if we can | |
5608 | determine that the address is one where functions cannot have | |
5609 | been inlined. This improves performance with inferiors that | |
5610 | load a lot of shared libraries, because the solib event | |
5611 | breakpoint is defined as the address of a function (i.e. not | |
5612 | inline). Note that we have to check the previous PC as well | |
5613 | as the current one to catch cases when we have just | |
5614 | single-stepped off a breakpoint prior to reinstating it. | |
5615 | Note that we're assuming that the code we single-step to is | |
5616 | not inline, but that's not definitive: there's nothing | |
5617 | preventing the event breakpoint function from containing | |
5618 | inlined code, and the single-step ending up there. If the | |
5619 | user had set a breakpoint on that inlined code, the missing | |
5620 | skip_inline_frames call would break things. Fortunately | |
5621 | that's an extremely unlikely scenario. */ | |
f2ffa92b PA |
5622 | if (!pc_at_non_inline_function (aspace, |
5623 | ecs->event_thread->suspend.stop_pc, | |
5624 | &ecs->ws) | |
a210c238 MR |
5625 | && !(ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP |
5626 | && ecs->event_thread->control.trap_expected | |
5627 | && pc_at_non_inline_function (aspace, | |
5628 | ecs->event_thread->prev_pc, | |
09ac7c10 | 5629 | &ecs->ws))) |
1c5a993e | 5630 | { |
f2ffa92b PA |
5631 | stop_chain = build_bpstat_chain (aspace, |
5632 | ecs->event_thread->suspend.stop_pc, | |
5633 | &ecs->ws); | |
00431a78 | 5634 | skip_inline_frames (ecs->event_thread, stop_chain); |
1c5a993e MR |
5635 | |
5636 | /* Re-fetch current thread's frame in case that invalidated | |
5637 | the frame cache. */ | |
5638 | frame = get_current_frame (); | |
5639 | gdbarch = get_frame_arch (frame); | |
5640 | } | |
0574c78f | 5641 | } |
edb3359d | 5642 | |
a493e3e2 | 5643 | if (ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP |
16c381f0 | 5644 | && ecs->event_thread->control.trap_expected |
568d6575 | 5645 | && gdbarch_single_step_through_delay_p (gdbarch) |
4e1c45ea | 5646 | && currently_stepping (ecs->event_thread)) |
3352ef37 | 5647 | { |
b50d7442 | 5648 | /* We're trying to step off a breakpoint. Turns out that we're |
3352ef37 | 5649 | also on an instruction that needs to be stepped multiple |
1777feb0 | 5650 | times before it's been fully executing. E.g., architectures |
3352ef37 AC |
5651 | with a delay slot. It needs to be stepped twice, once for |
5652 | the instruction and once for the delay slot. */ | |
5653 | int step_through_delay | |
568d6575 | 5654 | = gdbarch_single_step_through_delay (gdbarch, frame); |
abbb1732 | 5655 | |
527159b7 | 5656 | if (debug_infrun && step_through_delay) |
8a9de0e4 | 5657 | fprintf_unfiltered (gdb_stdlog, "infrun: step through delay\n"); |
16c381f0 JK |
5658 | if (ecs->event_thread->control.step_range_end == 0 |
5659 | && step_through_delay) | |
3352ef37 AC |
5660 | { |
5661 | /* The user issued a continue when stopped at a breakpoint. | |
5662 | Set up for another trap and get out of here. */ | |
4e1c45ea | 5663 | ecs->event_thread->stepping_over_breakpoint = 1; |
3352ef37 AC |
5664 | keep_going (ecs); |
5665 | return; | |
5666 | } | |
5667 | else if (step_through_delay) | |
5668 | { | |
5669 | /* The user issued a step when stopped at a breakpoint. | |
5670 | Maybe we should stop, maybe we should not - the delay | |
5671 | slot *might* correspond to a line of source. In any | |
ca67fcb8 VP |
5672 | case, don't decide that here, just set |
5673 | ecs->stepping_over_breakpoint, making sure we | |
5674 | single-step again before breakpoints are re-inserted. */ | |
4e1c45ea | 5675 | ecs->event_thread->stepping_over_breakpoint = 1; |
3352ef37 AC |
5676 | } |
5677 | } | |
5678 | ||
ab04a2af TT |
5679 | /* See if there is a breakpoint/watchpoint/catchpoint/etc. that |
5680 | handles this event. */ | |
5681 | ecs->event_thread->control.stop_bpstat | |
a01bda52 | 5682 | = bpstat_stop_status (get_current_regcache ()->aspace (), |
f2ffa92b PA |
5683 | ecs->event_thread->suspend.stop_pc, |
5684 | ecs->event_thread, &ecs->ws, stop_chain); | |
db82e815 | 5685 | |
ab04a2af TT |
5686 | /* Following in case break condition called a |
5687 | function. */ | |
5688 | stop_print_frame = 1; | |
73dd234f | 5689 | |
ab04a2af TT |
5690 | /* This is where we handle "moribund" watchpoints. Unlike |
5691 | software breakpoints traps, hardware watchpoint traps are | |
5692 | always distinguishable from random traps. If no high-level | |
5693 | watchpoint is associated with the reported stop data address | |
5694 | anymore, then the bpstat does not explain the signal --- | |
5695 | simply make sure to ignore it if `stopped_by_watchpoint' is | |
5696 | set. */ | |
5697 | ||
5698 | if (debug_infrun | |
5699 | && ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP | |
47591c29 | 5700 | && !bpstat_explains_signal (ecs->event_thread->control.stop_bpstat, |
427cd150 | 5701 | GDB_SIGNAL_TRAP) |
ab04a2af TT |
5702 | && stopped_by_watchpoint) |
5703 | fprintf_unfiltered (gdb_stdlog, | |
5704 | "infrun: no user watchpoint explains " | |
5705 | "watchpoint SIGTRAP, ignoring\n"); | |
73dd234f | 5706 | |
bac7d97b | 5707 | /* NOTE: cagney/2003-03-29: These checks for a random signal |
ab04a2af TT |
5708 | at one stage in the past included checks for an inferior |
5709 | function call's call dummy's return breakpoint. The original | |
5710 | comment, that went with the test, read: | |
03cebad2 | 5711 | |
ab04a2af TT |
5712 | ``End of a stack dummy. Some systems (e.g. Sony news) give |
5713 | another signal besides SIGTRAP, so check here as well as | |
5714 | above.'' | |
73dd234f | 5715 | |
ab04a2af TT |
5716 | If someone ever tries to get call dummys on a |
5717 | non-executable stack to work (where the target would stop | |
5718 | with something like a SIGSEGV), then those tests might need | |
5719 | to be re-instated. Given, however, that the tests were only | |
5720 | enabled when momentary breakpoints were not being used, I | |
5721 | suspect that it won't be the case. | |
488f131b | 5722 | |
ab04a2af TT |
5723 | NOTE: kettenis/2004-02-05: Indeed such checks don't seem to |
5724 | be necessary for call dummies on a non-executable stack on | |
5725 | SPARC. */ | |
488f131b | 5726 | |
bac7d97b | 5727 | /* See if the breakpoints module can explain the signal. */ |
47591c29 PA |
5728 | random_signal |
5729 | = !bpstat_explains_signal (ecs->event_thread->control.stop_bpstat, | |
5730 | ecs->event_thread->suspend.stop_signal); | |
bac7d97b | 5731 | |
1cf4d951 PA |
5732 | /* Maybe this was a trap for a software breakpoint that has since |
5733 | been removed. */ | |
5734 | if (random_signal && target_stopped_by_sw_breakpoint ()) | |
5735 | { | |
f2ffa92b PA |
5736 | if (program_breakpoint_here_p (gdbarch, |
5737 | ecs->event_thread->suspend.stop_pc)) | |
1cf4d951 PA |
5738 | { |
5739 | struct regcache *regcache; | |
5740 | int decr_pc; | |
5741 | ||
5742 | /* Re-adjust PC to what the program would see if GDB was not | |
5743 | debugging it. */ | |
00431a78 | 5744 | regcache = get_thread_regcache (ecs->event_thread); |
527a273a | 5745 | decr_pc = gdbarch_decr_pc_after_break (gdbarch); |
1cf4d951 PA |
5746 | if (decr_pc != 0) |
5747 | { | |
07036511 TT |
5748 | gdb::optional<scoped_restore_tmpl<int>> |
5749 | restore_operation_disable; | |
1cf4d951 PA |
5750 | |
5751 | if (record_full_is_used ()) | |
07036511 TT |
5752 | restore_operation_disable.emplace |
5753 | (record_full_gdb_operation_disable_set ()); | |
1cf4d951 | 5754 | |
f2ffa92b PA |
5755 | regcache_write_pc (regcache, |
5756 | ecs->event_thread->suspend.stop_pc + decr_pc); | |
1cf4d951 PA |
5757 | } |
5758 | } | |
5759 | else | |
5760 | { | |
5761 | /* A delayed software breakpoint event. Ignore the trap. */ | |
5762 | if (debug_infrun) | |
5763 | fprintf_unfiltered (gdb_stdlog, | |
5764 | "infrun: delayed software breakpoint " | |
5765 | "trap, ignoring\n"); | |
5766 | random_signal = 0; | |
5767 | } | |
5768 | } | |
5769 | ||
5770 | /* Maybe this was a trap for a hardware breakpoint/watchpoint that | |
5771 | has since been removed. */ | |
5772 | if (random_signal && target_stopped_by_hw_breakpoint ()) | |
5773 | { | |
5774 | /* A delayed hardware breakpoint event. Ignore the trap. */ | |
5775 | if (debug_infrun) | |
5776 | fprintf_unfiltered (gdb_stdlog, | |
5777 | "infrun: delayed hardware breakpoint/watchpoint " | |
5778 | "trap, ignoring\n"); | |
5779 | random_signal = 0; | |
5780 | } | |
5781 | ||
bac7d97b PA |
5782 | /* If not, perhaps stepping/nexting can. */ |
5783 | if (random_signal) | |
5784 | random_signal = !(ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP | |
5785 | && currently_stepping (ecs->event_thread)); | |
ab04a2af | 5786 | |
2adfaa28 PA |
5787 | /* Perhaps the thread hit a single-step breakpoint of _another_ |
5788 | thread. Single-step breakpoints are transparent to the | |
5789 | breakpoints module. */ | |
5790 | if (random_signal) | |
5791 | random_signal = !ecs->hit_singlestep_breakpoint; | |
5792 | ||
bac7d97b PA |
5793 | /* No? Perhaps we got a moribund watchpoint. */ |
5794 | if (random_signal) | |
5795 | random_signal = !stopped_by_watchpoint; | |
ab04a2af | 5796 | |
c65d6b55 PA |
5797 | /* Always stop if the user explicitly requested this thread to |
5798 | remain stopped. */ | |
5799 | if (ecs->event_thread->stop_requested) | |
5800 | { | |
5801 | random_signal = 1; | |
5802 | if (debug_infrun) | |
5803 | fprintf_unfiltered (gdb_stdlog, "infrun: user-requested stop\n"); | |
5804 | } | |
5805 | ||
488f131b JB |
5806 | /* For the program's own signals, act according to |
5807 | the signal handling tables. */ | |
5808 | ||
ce12b012 | 5809 | if (random_signal) |
488f131b JB |
5810 | { |
5811 | /* Signal not for debugging purposes. */ | |
c9657e70 | 5812 | struct inferior *inf = find_inferior_ptid (ecs->ptid); |
c9737c08 | 5813 | enum gdb_signal stop_signal = ecs->event_thread->suspend.stop_signal; |
488f131b | 5814 | |
527159b7 | 5815 | if (debug_infrun) |
c9737c08 PA |
5816 | fprintf_unfiltered (gdb_stdlog, "infrun: random signal (%s)\n", |
5817 | gdb_signal_to_symbol_string (stop_signal)); | |
527159b7 | 5818 | |
488f131b JB |
5819 | stopped_by_random_signal = 1; |
5820 | ||
252fbfc8 PA |
5821 | /* Always stop on signals if we're either just gaining control |
5822 | of the program, or the user explicitly requested this thread | |
5823 | to remain stopped. */ | |
d6b48e9c | 5824 | if (stop_soon != NO_STOP_QUIETLY |
252fbfc8 | 5825 | || ecs->event_thread->stop_requested |
24291992 | 5826 | || (!inf->detaching |
16c381f0 | 5827 | && signal_stop_state (ecs->event_thread->suspend.stop_signal))) |
488f131b | 5828 | { |
22bcd14b | 5829 | stop_waiting (ecs); |
488f131b JB |
5830 | return; |
5831 | } | |
b57bacec PA |
5832 | |
5833 | /* Notify observers the signal has "handle print" set. Note we | |
5834 | returned early above if stopping; normal_stop handles the | |
5835 | printing in that case. */ | |
5836 | if (signal_print[ecs->event_thread->suspend.stop_signal]) | |
5837 | { | |
5838 | /* The signal table tells us to print about this signal. */ | |
223ffa71 | 5839 | target_terminal::ours_for_output (); |
76727919 | 5840 | gdb::observers::signal_received.notify (ecs->event_thread->suspend.stop_signal); |
223ffa71 | 5841 | target_terminal::inferior (); |
b57bacec | 5842 | } |
488f131b JB |
5843 | |
5844 | /* Clear the signal if it should not be passed. */ | |
16c381f0 | 5845 | if (signal_program[ecs->event_thread->suspend.stop_signal] == 0) |
a493e3e2 | 5846 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; |
488f131b | 5847 | |
f2ffa92b | 5848 | if (ecs->event_thread->prev_pc == ecs->event_thread->suspend.stop_pc |
16c381f0 | 5849 | && ecs->event_thread->control.trap_expected |
8358c15c | 5850 | && ecs->event_thread->control.step_resume_breakpoint == NULL) |
68f53502 AC |
5851 | { |
5852 | /* We were just starting a new sequence, attempting to | |
5853 | single-step off of a breakpoint and expecting a SIGTRAP. | |
237fc4c9 | 5854 | Instead this signal arrives. This signal will take us out |
68f53502 AC |
5855 | of the stepping range so GDB needs to remember to, when |
5856 | the signal handler returns, resume stepping off that | |
5857 | breakpoint. */ | |
5858 | /* To simplify things, "continue" is forced to use the same | |
5859 | code paths as single-step - set a breakpoint at the | |
5860 | signal return address and then, once hit, step off that | |
5861 | breakpoint. */ | |
237fc4c9 PA |
5862 | if (debug_infrun) |
5863 | fprintf_unfiltered (gdb_stdlog, | |
5864 | "infrun: signal arrived while stepping over " | |
5865 | "breakpoint\n"); | |
d3169d93 | 5866 | |
2c03e5be | 5867 | insert_hp_step_resume_breakpoint_at_frame (frame); |
4e1c45ea | 5868 | ecs->event_thread->step_after_step_resume_breakpoint = 1; |
2455069d UW |
5869 | /* Reset trap_expected to ensure breakpoints are re-inserted. */ |
5870 | ecs->event_thread->control.trap_expected = 0; | |
d137e6dc PA |
5871 | |
5872 | /* If we were nexting/stepping some other thread, switch to | |
5873 | it, so that we don't continue it, losing control. */ | |
5874 | if (!switch_back_to_stepped_thread (ecs)) | |
5875 | keep_going (ecs); | |
9d799f85 | 5876 | return; |
68f53502 | 5877 | } |
9d799f85 | 5878 | |
e5f8a7cc | 5879 | if (ecs->event_thread->suspend.stop_signal != GDB_SIGNAL_0 |
f2ffa92b PA |
5880 | && (pc_in_thread_step_range (ecs->event_thread->suspend.stop_pc, |
5881 | ecs->event_thread) | |
e5f8a7cc | 5882 | || ecs->event_thread->control.step_range_end == 1) |
edb3359d | 5883 | && frame_id_eq (get_stack_frame_id (frame), |
16c381f0 | 5884 | ecs->event_thread->control.step_stack_frame_id) |
8358c15c | 5885 | && ecs->event_thread->control.step_resume_breakpoint == NULL) |
d303a6c7 AC |
5886 | { |
5887 | /* The inferior is about to take a signal that will take it | |
5888 | out of the single step range. Set a breakpoint at the | |
5889 | current PC (which is presumably where the signal handler | |
5890 | will eventually return) and then allow the inferior to | |
5891 | run free. | |
5892 | ||
5893 | Note that this is only needed for a signal delivered | |
5894 | while in the single-step range. Nested signals aren't a | |
5895 | problem as they eventually all return. */ | |
237fc4c9 PA |
5896 | if (debug_infrun) |
5897 | fprintf_unfiltered (gdb_stdlog, | |
5898 | "infrun: signal may take us out of " | |
5899 | "single-step range\n"); | |
5900 | ||
372316f1 | 5901 | clear_step_over_info (); |
2c03e5be | 5902 | insert_hp_step_resume_breakpoint_at_frame (frame); |
e5f8a7cc | 5903 | ecs->event_thread->step_after_step_resume_breakpoint = 1; |
2455069d UW |
5904 | /* Reset trap_expected to ensure breakpoints are re-inserted. */ |
5905 | ecs->event_thread->control.trap_expected = 0; | |
9d799f85 AC |
5906 | keep_going (ecs); |
5907 | return; | |
d303a6c7 | 5908 | } |
9d799f85 AC |
5909 | |
5910 | /* Note: step_resume_breakpoint may be non-NULL. This occures | |
5911 | when either there's a nested signal, or when there's a | |
5912 | pending signal enabled just as the signal handler returns | |
5913 | (leaving the inferior at the step-resume-breakpoint without | |
5914 | actually executing it). Either way continue until the | |
5915 | breakpoint is really hit. */ | |
c447ac0b PA |
5916 | |
5917 | if (!switch_back_to_stepped_thread (ecs)) | |
5918 | { | |
5919 | if (debug_infrun) | |
5920 | fprintf_unfiltered (gdb_stdlog, | |
5921 | "infrun: random signal, keep going\n"); | |
5922 | ||
5923 | keep_going (ecs); | |
5924 | } | |
5925 | return; | |
488f131b | 5926 | } |
94c57d6a PA |
5927 | |
5928 | process_event_stop_test (ecs); | |
5929 | } | |
5930 | ||
5931 | /* Come here when we've got some debug event / signal we can explain | |
5932 | (IOW, not a random signal), and test whether it should cause a | |
5933 | stop, or whether we should resume the inferior (transparently). | |
5934 | E.g., could be a breakpoint whose condition evaluates false; we | |
5935 | could be still stepping within the line; etc. */ | |
5936 | ||
5937 | static void | |
5938 | process_event_stop_test (struct execution_control_state *ecs) | |
5939 | { | |
5940 | struct symtab_and_line stop_pc_sal; | |
5941 | struct frame_info *frame; | |
5942 | struct gdbarch *gdbarch; | |
cdaa5b73 PA |
5943 | CORE_ADDR jmp_buf_pc; |
5944 | struct bpstat_what what; | |
94c57d6a | 5945 | |
cdaa5b73 | 5946 | /* Handle cases caused by hitting a breakpoint. */ |
611c83ae | 5947 | |
cdaa5b73 PA |
5948 | frame = get_current_frame (); |
5949 | gdbarch = get_frame_arch (frame); | |
fcf3daef | 5950 | |
cdaa5b73 | 5951 | what = bpstat_what (ecs->event_thread->control.stop_bpstat); |
611c83ae | 5952 | |
cdaa5b73 PA |
5953 | if (what.call_dummy) |
5954 | { | |
5955 | stop_stack_dummy = what.call_dummy; | |
5956 | } | |
186c406b | 5957 | |
243a9253 PA |
5958 | /* A few breakpoint types have callbacks associated (e.g., |
5959 | bp_jit_event). Run them now. */ | |
5960 | bpstat_run_callbacks (ecs->event_thread->control.stop_bpstat); | |
5961 | ||
cdaa5b73 PA |
5962 | /* If we hit an internal event that triggers symbol changes, the |
5963 | current frame will be invalidated within bpstat_what (e.g., if we | |
5964 | hit an internal solib event). Re-fetch it. */ | |
5965 | frame = get_current_frame (); | |
5966 | gdbarch = get_frame_arch (frame); | |
e2e4d78b | 5967 | |
cdaa5b73 PA |
5968 | switch (what.main_action) |
5969 | { | |
5970 | case BPSTAT_WHAT_SET_LONGJMP_RESUME: | |
5971 | /* If we hit the breakpoint at longjmp while stepping, we | |
5972 | install a momentary breakpoint at the target of the | |
5973 | jmp_buf. */ | |
186c406b | 5974 | |
cdaa5b73 PA |
5975 | if (debug_infrun) |
5976 | fprintf_unfiltered (gdb_stdlog, | |
5977 | "infrun: BPSTAT_WHAT_SET_LONGJMP_RESUME\n"); | |
186c406b | 5978 | |
cdaa5b73 | 5979 | ecs->event_thread->stepping_over_breakpoint = 1; |
611c83ae | 5980 | |
cdaa5b73 PA |
5981 | if (what.is_longjmp) |
5982 | { | |
5983 | struct value *arg_value; | |
5984 | ||
5985 | /* If we set the longjmp breakpoint via a SystemTap probe, | |
5986 | then use it to extract the arguments. The destination PC | |
5987 | is the third argument to the probe. */ | |
5988 | arg_value = probe_safe_evaluate_at_pc (frame, 2); | |
5989 | if (arg_value) | |
8fa0c4f8 AA |
5990 | { |
5991 | jmp_buf_pc = value_as_address (arg_value); | |
5992 | jmp_buf_pc = gdbarch_addr_bits_remove (gdbarch, jmp_buf_pc); | |
5993 | } | |
cdaa5b73 PA |
5994 | else if (!gdbarch_get_longjmp_target_p (gdbarch) |
5995 | || !gdbarch_get_longjmp_target (gdbarch, | |
5996 | frame, &jmp_buf_pc)) | |
e2e4d78b | 5997 | { |
cdaa5b73 PA |
5998 | if (debug_infrun) |
5999 | fprintf_unfiltered (gdb_stdlog, | |
6000 | "infrun: BPSTAT_WHAT_SET_LONGJMP_RESUME " | |
6001 | "(!gdbarch_get_longjmp_target)\n"); | |
6002 | keep_going (ecs); | |
6003 | return; | |
e2e4d78b | 6004 | } |
e2e4d78b | 6005 | |
cdaa5b73 PA |
6006 | /* Insert a breakpoint at resume address. */ |
6007 | insert_longjmp_resume_breakpoint (gdbarch, jmp_buf_pc); | |
6008 | } | |
6009 | else | |
6010 | check_exception_resume (ecs, frame); | |
6011 | keep_going (ecs); | |
6012 | return; | |
e81a37f7 | 6013 | |
cdaa5b73 PA |
6014 | case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME: |
6015 | { | |
6016 | struct frame_info *init_frame; | |
e81a37f7 | 6017 | |
cdaa5b73 | 6018 | /* There are several cases to consider. |
c906108c | 6019 | |
cdaa5b73 PA |
6020 | 1. The initiating frame no longer exists. In this case we |
6021 | must stop, because the exception or longjmp has gone too | |
6022 | far. | |
2c03e5be | 6023 | |
cdaa5b73 PA |
6024 | 2. The initiating frame exists, and is the same as the |
6025 | current frame. We stop, because the exception or longjmp | |
6026 | has been caught. | |
2c03e5be | 6027 | |
cdaa5b73 PA |
6028 | 3. The initiating frame exists and is different from the |
6029 | current frame. This means the exception or longjmp has | |
6030 | been caught beneath the initiating frame, so keep going. | |
c906108c | 6031 | |
cdaa5b73 PA |
6032 | 4. longjmp breakpoint has been placed just to protect |
6033 | against stale dummy frames and user is not interested in | |
6034 | stopping around longjmps. */ | |
c5aa993b | 6035 | |
cdaa5b73 PA |
6036 | if (debug_infrun) |
6037 | fprintf_unfiltered (gdb_stdlog, | |
6038 | "infrun: BPSTAT_WHAT_CLEAR_LONGJMP_RESUME\n"); | |
c5aa993b | 6039 | |
cdaa5b73 PA |
6040 | gdb_assert (ecs->event_thread->control.exception_resume_breakpoint |
6041 | != NULL); | |
6042 | delete_exception_resume_breakpoint (ecs->event_thread); | |
c5aa993b | 6043 | |
cdaa5b73 PA |
6044 | if (what.is_longjmp) |
6045 | { | |
b67a2c6f | 6046 | check_longjmp_breakpoint_for_call_dummy (ecs->event_thread); |
c5aa993b | 6047 | |
cdaa5b73 | 6048 | if (!frame_id_p (ecs->event_thread->initiating_frame)) |
e5ef252a | 6049 | { |
cdaa5b73 PA |
6050 | /* Case 4. */ |
6051 | keep_going (ecs); | |
6052 | return; | |
e5ef252a | 6053 | } |
cdaa5b73 | 6054 | } |
c5aa993b | 6055 | |
cdaa5b73 | 6056 | init_frame = frame_find_by_id (ecs->event_thread->initiating_frame); |
527159b7 | 6057 | |
cdaa5b73 PA |
6058 | if (init_frame) |
6059 | { | |
6060 | struct frame_id current_id | |
6061 | = get_frame_id (get_current_frame ()); | |
6062 | if (frame_id_eq (current_id, | |
6063 | ecs->event_thread->initiating_frame)) | |
6064 | { | |
6065 | /* Case 2. Fall through. */ | |
6066 | } | |
6067 | else | |
6068 | { | |
6069 | /* Case 3. */ | |
6070 | keep_going (ecs); | |
6071 | return; | |
6072 | } | |
68f53502 | 6073 | } |
488f131b | 6074 | |
cdaa5b73 PA |
6075 | /* For Cases 1 and 2, remove the step-resume breakpoint, if it |
6076 | exists. */ | |
6077 | delete_step_resume_breakpoint (ecs->event_thread); | |
e5ef252a | 6078 | |
bdc36728 | 6079 | end_stepping_range (ecs); |
cdaa5b73 PA |
6080 | } |
6081 | return; | |
e5ef252a | 6082 | |
cdaa5b73 PA |
6083 | case BPSTAT_WHAT_SINGLE: |
6084 | if (debug_infrun) | |
6085 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_SINGLE\n"); | |
6086 | ecs->event_thread->stepping_over_breakpoint = 1; | |
6087 | /* Still need to check other stuff, at least the case where we | |
6088 | are stepping and step out of the right range. */ | |
6089 | break; | |
e5ef252a | 6090 | |
cdaa5b73 PA |
6091 | case BPSTAT_WHAT_STEP_RESUME: |
6092 | if (debug_infrun) | |
6093 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_STEP_RESUME\n"); | |
e5ef252a | 6094 | |
cdaa5b73 PA |
6095 | delete_step_resume_breakpoint (ecs->event_thread); |
6096 | if (ecs->event_thread->control.proceed_to_finish | |
6097 | && execution_direction == EXEC_REVERSE) | |
6098 | { | |
6099 | struct thread_info *tp = ecs->event_thread; | |
6100 | ||
6101 | /* We are finishing a function in reverse, and just hit the | |
6102 | step-resume breakpoint at the start address of the | |
6103 | function, and we're almost there -- just need to back up | |
6104 | by one more single-step, which should take us back to the | |
6105 | function call. */ | |
6106 | tp->control.step_range_start = tp->control.step_range_end = 1; | |
6107 | keep_going (ecs); | |
e5ef252a | 6108 | return; |
cdaa5b73 PA |
6109 | } |
6110 | fill_in_stop_func (gdbarch, ecs); | |
f2ffa92b | 6111 | if (ecs->event_thread->suspend.stop_pc == ecs->stop_func_start |
cdaa5b73 PA |
6112 | && execution_direction == EXEC_REVERSE) |
6113 | { | |
6114 | /* We are stepping over a function call in reverse, and just | |
6115 | hit the step-resume breakpoint at the start address of | |
6116 | the function. Go back to single-stepping, which should | |
6117 | take us back to the function call. */ | |
6118 | ecs->event_thread->stepping_over_breakpoint = 1; | |
6119 | keep_going (ecs); | |
6120 | return; | |
6121 | } | |
6122 | break; | |
e5ef252a | 6123 | |
cdaa5b73 PA |
6124 | case BPSTAT_WHAT_STOP_NOISY: |
6125 | if (debug_infrun) | |
6126 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_STOP_NOISY\n"); | |
6127 | stop_print_frame = 1; | |
e5ef252a | 6128 | |
99619bea PA |
6129 | /* Assume the thread stopped for a breapoint. We'll still check |
6130 | whether a/the breakpoint is there when the thread is next | |
6131 | resumed. */ | |
6132 | ecs->event_thread->stepping_over_breakpoint = 1; | |
e5ef252a | 6133 | |
22bcd14b | 6134 | stop_waiting (ecs); |
cdaa5b73 | 6135 | return; |
e5ef252a | 6136 | |
cdaa5b73 PA |
6137 | case BPSTAT_WHAT_STOP_SILENT: |
6138 | if (debug_infrun) | |
6139 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_STOP_SILENT\n"); | |
6140 | stop_print_frame = 0; | |
e5ef252a | 6141 | |
99619bea PA |
6142 | /* Assume the thread stopped for a breapoint. We'll still check |
6143 | whether a/the breakpoint is there when the thread is next | |
6144 | resumed. */ | |
6145 | ecs->event_thread->stepping_over_breakpoint = 1; | |
22bcd14b | 6146 | stop_waiting (ecs); |
cdaa5b73 PA |
6147 | return; |
6148 | ||
6149 | case BPSTAT_WHAT_HP_STEP_RESUME: | |
6150 | if (debug_infrun) | |
6151 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_HP_STEP_RESUME\n"); | |
6152 | ||
6153 | delete_step_resume_breakpoint (ecs->event_thread); | |
6154 | if (ecs->event_thread->step_after_step_resume_breakpoint) | |
6155 | { | |
6156 | /* Back when the step-resume breakpoint was inserted, we | |
6157 | were trying to single-step off a breakpoint. Go back to | |
6158 | doing that. */ | |
6159 | ecs->event_thread->step_after_step_resume_breakpoint = 0; | |
6160 | ecs->event_thread->stepping_over_breakpoint = 1; | |
6161 | keep_going (ecs); | |
6162 | return; | |
e5ef252a | 6163 | } |
cdaa5b73 PA |
6164 | break; |
6165 | ||
6166 | case BPSTAT_WHAT_KEEP_CHECKING: | |
6167 | break; | |
e5ef252a | 6168 | } |
c906108c | 6169 | |
af48d08f PA |
6170 | /* If we stepped a permanent breakpoint and we had a high priority |
6171 | step-resume breakpoint for the address we stepped, but we didn't | |
6172 | hit it, then we must have stepped into the signal handler. The | |
6173 | step-resume was only necessary to catch the case of _not_ | |
6174 | stepping into the handler, so delete it, and fall through to | |
6175 | checking whether the step finished. */ | |
6176 | if (ecs->event_thread->stepped_breakpoint) | |
6177 | { | |
6178 | struct breakpoint *sr_bp | |
6179 | = ecs->event_thread->control.step_resume_breakpoint; | |
6180 | ||
8d707a12 PA |
6181 | if (sr_bp != NULL |
6182 | && sr_bp->loc->permanent | |
af48d08f PA |
6183 | && sr_bp->type == bp_hp_step_resume |
6184 | && sr_bp->loc->address == ecs->event_thread->prev_pc) | |
6185 | { | |
6186 | if (debug_infrun) | |
6187 | fprintf_unfiltered (gdb_stdlog, | |
6188 | "infrun: stepped permanent breakpoint, stopped in " | |
6189 | "handler\n"); | |
6190 | delete_step_resume_breakpoint (ecs->event_thread); | |
6191 | ecs->event_thread->step_after_step_resume_breakpoint = 0; | |
6192 | } | |
6193 | } | |
6194 | ||
cdaa5b73 PA |
6195 | /* We come here if we hit a breakpoint but should not stop for it. |
6196 | Possibly we also were stepping and should stop for that. So fall | |
6197 | through and test for stepping. But, if not stepping, do not | |
6198 | stop. */ | |
c906108c | 6199 | |
a7212384 UW |
6200 | /* In all-stop mode, if we're currently stepping but have stopped in |
6201 | some other thread, we need to switch back to the stepped thread. */ | |
c447ac0b PA |
6202 | if (switch_back_to_stepped_thread (ecs)) |
6203 | return; | |
776f04fa | 6204 | |
8358c15c | 6205 | if (ecs->event_thread->control.step_resume_breakpoint) |
488f131b | 6206 | { |
527159b7 | 6207 | if (debug_infrun) |
d3169d93 DJ |
6208 | fprintf_unfiltered (gdb_stdlog, |
6209 | "infrun: step-resume breakpoint is inserted\n"); | |
527159b7 | 6210 | |
488f131b JB |
6211 | /* Having a step-resume breakpoint overrides anything |
6212 | else having to do with stepping commands until | |
6213 | that breakpoint is reached. */ | |
488f131b JB |
6214 | keep_going (ecs); |
6215 | return; | |
6216 | } | |
c5aa993b | 6217 | |
16c381f0 | 6218 | if (ecs->event_thread->control.step_range_end == 0) |
488f131b | 6219 | { |
527159b7 | 6220 | if (debug_infrun) |
8a9de0e4 | 6221 | fprintf_unfiltered (gdb_stdlog, "infrun: no stepping, continue\n"); |
488f131b | 6222 | /* Likewise if we aren't even stepping. */ |
488f131b JB |
6223 | keep_going (ecs); |
6224 | return; | |
6225 | } | |
c5aa993b | 6226 | |
4b7703ad JB |
6227 | /* Re-fetch current thread's frame in case the code above caused |
6228 | the frame cache to be re-initialized, making our FRAME variable | |
6229 | a dangling pointer. */ | |
6230 | frame = get_current_frame (); | |
628fe4e4 | 6231 | gdbarch = get_frame_arch (frame); |
7e324e48 | 6232 | fill_in_stop_func (gdbarch, ecs); |
4b7703ad | 6233 | |
488f131b | 6234 | /* If stepping through a line, keep going if still within it. |
c906108c | 6235 | |
488f131b JB |
6236 | Note that step_range_end is the address of the first instruction |
6237 | beyond the step range, and NOT the address of the last instruction | |
31410e84 MS |
6238 | within it! |
6239 | ||
6240 | Note also that during reverse execution, we may be stepping | |
6241 | through a function epilogue and therefore must detect when | |
6242 | the current-frame changes in the middle of a line. */ | |
6243 | ||
f2ffa92b PA |
6244 | if (pc_in_thread_step_range (ecs->event_thread->suspend.stop_pc, |
6245 | ecs->event_thread) | |
31410e84 | 6246 | && (execution_direction != EXEC_REVERSE |
388a8562 | 6247 | || frame_id_eq (get_frame_id (frame), |
16c381f0 | 6248 | ecs->event_thread->control.step_frame_id))) |
488f131b | 6249 | { |
527159b7 | 6250 | if (debug_infrun) |
5af949e3 UW |
6251 | fprintf_unfiltered |
6252 | (gdb_stdlog, "infrun: stepping inside range [%s-%s]\n", | |
16c381f0 JK |
6253 | paddress (gdbarch, ecs->event_thread->control.step_range_start), |
6254 | paddress (gdbarch, ecs->event_thread->control.step_range_end)); | |
b2175913 | 6255 | |
c1e36e3e PA |
6256 | /* Tentatively re-enable range stepping; `resume' disables it if |
6257 | necessary (e.g., if we're stepping over a breakpoint or we | |
6258 | have software watchpoints). */ | |
6259 | ecs->event_thread->control.may_range_step = 1; | |
6260 | ||
b2175913 MS |
6261 | /* When stepping backward, stop at beginning of line range |
6262 | (unless it's the function entry point, in which case | |
6263 | keep going back to the call point). */ | |
f2ffa92b | 6264 | CORE_ADDR stop_pc = ecs->event_thread->suspend.stop_pc; |
16c381f0 | 6265 | if (stop_pc == ecs->event_thread->control.step_range_start |
b2175913 MS |
6266 | && stop_pc != ecs->stop_func_start |
6267 | && execution_direction == EXEC_REVERSE) | |
bdc36728 | 6268 | end_stepping_range (ecs); |
b2175913 MS |
6269 | else |
6270 | keep_going (ecs); | |
6271 | ||
488f131b JB |
6272 | return; |
6273 | } | |
c5aa993b | 6274 | |
488f131b | 6275 | /* We stepped out of the stepping range. */ |
c906108c | 6276 | |
488f131b | 6277 | /* If we are stepping at the source level and entered the runtime |
388a8562 MS |
6278 | loader dynamic symbol resolution code... |
6279 | ||
6280 | EXEC_FORWARD: we keep on single stepping until we exit the run | |
6281 | time loader code and reach the callee's address. | |
6282 | ||
6283 | EXEC_REVERSE: we've already executed the callee (backward), and | |
6284 | the runtime loader code is handled just like any other | |
6285 | undebuggable function call. Now we need only keep stepping | |
6286 | backward through the trampoline code, and that's handled further | |
6287 | down, so there is nothing for us to do here. */ | |
6288 | ||
6289 | if (execution_direction != EXEC_REVERSE | |
16c381f0 | 6290 | && ecs->event_thread->control.step_over_calls == STEP_OVER_UNDEBUGGABLE |
f2ffa92b | 6291 | && in_solib_dynsym_resolve_code (ecs->event_thread->suspend.stop_pc)) |
488f131b | 6292 | { |
4c8c40e6 | 6293 | CORE_ADDR pc_after_resolver = |
f2ffa92b PA |
6294 | gdbarch_skip_solib_resolver (gdbarch, |
6295 | ecs->event_thread->suspend.stop_pc); | |
c906108c | 6296 | |
527159b7 | 6297 | if (debug_infrun) |
3e43a32a MS |
6298 | fprintf_unfiltered (gdb_stdlog, |
6299 | "infrun: stepped into dynsym resolve code\n"); | |
527159b7 | 6300 | |
488f131b JB |
6301 | if (pc_after_resolver) |
6302 | { | |
6303 | /* Set up a step-resume breakpoint at the address | |
6304 | indicated by SKIP_SOLIB_RESOLVER. */ | |
51abb421 | 6305 | symtab_and_line sr_sal; |
488f131b | 6306 | sr_sal.pc = pc_after_resolver; |
6c95b8df | 6307 | sr_sal.pspace = get_frame_program_space (frame); |
488f131b | 6308 | |
a6d9a66e UW |
6309 | insert_step_resume_breakpoint_at_sal (gdbarch, |
6310 | sr_sal, null_frame_id); | |
c5aa993b | 6311 | } |
c906108c | 6312 | |
488f131b JB |
6313 | keep_going (ecs); |
6314 | return; | |
6315 | } | |
c906108c | 6316 | |
1d509aa6 MM |
6317 | /* Step through an indirect branch thunk. */ |
6318 | if (ecs->event_thread->control.step_over_calls != STEP_OVER_NONE | |
f2ffa92b PA |
6319 | && gdbarch_in_indirect_branch_thunk (gdbarch, |
6320 | ecs->event_thread->suspend.stop_pc)) | |
1d509aa6 MM |
6321 | { |
6322 | if (debug_infrun) | |
6323 | fprintf_unfiltered (gdb_stdlog, | |
6324 | "infrun: stepped into indirect branch thunk\n"); | |
6325 | keep_going (ecs); | |
6326 | return; | |
6327 | } | |
6328 | ||
16c381f0 JK |
6329 | if (ecs->event_thread->control.step_range_end != 1 |
6330 | && (ecs->event_thread->control.step_over_calls == STEP_OVER_UNDEBUGGABLE | |
6331 | || ecs->event_thread->control.step_over_calls == STEP_OVER_ALL) | |
568d6575 | 6332 | && get_frame_type (frame) == SIGTRAMP_FRAME) |
488f131b | 6333 | { |
527159b7 | 6334 | if (debug_infrun) |
3e43a32a MS |
6335 | fprintf_unfiltered (gdb_stdlog, |
6336 | "infrun: stepped into signal trampoline\n"); | |
42edda50 | 6337 | /* The inferior, while doing a "step" or "next", has ended up in |
8fb3e588 AC |
6338 | a signal trampoline (either by a signal being delivered or by |
6339 | the signal handler returning). Just single-step until the | |
6340 | inferior leaves the trampoline (either by calling the handler | |
6341 | or returning). */ | |
488f131b JB |
6342 | keep_going (ecs); |
6343 | return; | |
6344 | } | |
c906108c | 6345 | |
14132e89 MR |
6346 | /* If we're in the return path from a shared library trampoline, |
6347 | we want to proceed through the trampoline when stepping. */ | |
6348 | /* macro/2012-04-25: This needs to come before the subroutine | |
6349 | call check below as on some targets return trampolines look | |
6350 | like subroutine calls (MIPS16 return thunks). */ | |
6351 | if (gdbarch_in_solib_return_trampoline (gdbarch, | |
f2ffa92b PA |
6352 | ecs->event_thread->suspend.stop_pc, |
6353 | ecs->stop_func_name) | |
14132e89 MR |
6354 | && ecs->event_thread->control.step_over_calls != STEP_OVER_NONE) |
6355 | { | |
6356 | /* Determine where this trampoline returns. */ | |
f2ffa92b PA |
6357 | CORE_ADDR stop_pc = ecs->event_thread->suspend.stop_pc; |
6358 | CORE_ADDR real_stop_pc | |
6359 | = gdbarch_skip_trampoline_code (gdbarch, frame, stop_pc); | |
14132e89 MR |
6360 | |
6361 | if (debug_infrun) | |
6362 | fprintf_unfiltered (gdb_stdlog, | |
6363 | "infrun: stepped into solib return tramp\n"); | |
6364 | ||
6365 | /* Only proceed through if we know where it's going. */ | |
6366 | if (real_stop_pc) | |
6367 | { | |
6368 | /* And put the step-breakpoint there and go until there. */ | |
51abb421 | 6369 | symtab_and_line sr_sal; |
14132e89 MR |
6370 | sr_sal.pc = real_stop_pc; |
6371 | sr_sal.section = find_pc_overlay (sr_sal.pc); | |
6372 | sr_sal.pspace = get_frame_program_space (frame); | |
6373 | ||
6374 | /* Do not specify what the fp should be when we stop since | |
6375 | on some machines the prologue is where the new fp value | |
6376 | is established. */ | |
6377 | insert_step_resume_breakpoint_at_sal (gdbarch, | |
6378 | sr_sal, null_frame_id); | |
6379 | ||
6380 | /* Restart without fiddling with the step ranges or | |
6381 | other state. */ | |
6382 | keep_going (ecs); | |
6383 | return; | |
6384 | } | |
6385 | } | |
6386 | ||
c17eaafe DJ |
6387 | /* Check for subroutine calls. The check for the current frame |
6388 | equalling the step ID is not necessary - the check of the | |
6389 | previous frame's ID is sufficient - but it is a common case and | |
6390 | cheaper than checking the previous frame's ID. | |
14e60db5 DJ |
6391 | |
6392 | NOTE: frame_id_eq will never report two invalid frame IDs as | |
6393 | being equal, so to get into this block, both the current and | |
6394 | previous frame must have valid frame IDs. */ | |
005ca36a JB |
6395 | /* The outer_frame_id check is a heuristic to detect stepping |
6396 | through startup code. If we step over an instruction which | |
6397 | sets the stack pointer from an invalid value to a valid value, | |
6398 | we may detect that as a subroutine call from the mythical | |
6399 | "outermost" function. This could be fixed by marking | |
6400 | outermost frames as !stack_p,code_p,special_p. Then the | |
6401 | initial outermost frame, before sp was valid, would | |
ce6cca6d | 6402 | have code_addr == &_start. See the comment in frame_id_eq |
005ca36a | 6403 | for more. */ |
edb3359d | 6404 | if (!frame_id_eq (get_stack_frame_id (frame), |
16c381f0 | 6405 | ecs->event_thread->control.step_stack_frame_id) |
005ca36a | 6406 | && (frame_id_eq (frame_unwind_caller_id (get_current_frame ()), |
16c381f0 JK |
6407 | ecs->event_thread->control.step_stack_frame_id) |
6408 | && (!frame_id_eq (ecs->event_thread->control.step_stack_frame_id, | |
005ca36a | 6409 | outer_frame_id) |
885eeb5b | 6410 | || (ecs->event_thread->control.step_start_function |
f2ffa92b | 6411 | != find_pc_function (ecs->event_thread->suspend.stop_pc))))) |
488f131b | 6412 | { |
f2ffa92b | 6413 | CORE_ADDR stop_pc = ecs->event_thread->suspend.stop_pc; |
95918acb | 6414 | CORE_ADDR real_stop_pc; |
8fb3e588 | 6415 | |
527159b7 | 6416 | if (debug_infrun) |
8a9de0e4 | 6417 | fprintf_unfiltered (gdb_stdlog, "infrun: stepped into subroutine\n"); |
527159b7 | 6418 | |
b7a084be | 6419 | if (ecs->event_thread->control.step_over_calls == STEP_OVER_NONE) |
95918acb AC |
6420 | { |
6421 | /* I presume that step_over_calls is only 0 when we're | |
6422 | supposed to be stepping at the assembly language level | |
6423 | ("stepi"). Just stop. */ | |
388a8562 | 6424 | /* And this works the same backward as frontward. MVS */ |
bdc36728 | 6425 | end_stepping_range (ecs); |
95918acb AC |
6426 | return; |
6427 | } | |
8fb3e588 | 6428 | |
388a8562 MS |
6429 | /* Reverse stepping through solib trampolines. */ |
6430 | ||
6431 | if (execution_direction == EXEC_REVERSE | |
16c381f0 | 6432 | && ecs->event_thread->control.step_over_calls != STEP_OVER_NONE |
388a8562 MS |
6433 | && (gdbarch_skip_trampoline_code (gdbarch, frame, stop_pc) |
6434 | || (ecs->stop_func_start == 0 | |
6435 | && in_solib_dynsym_resolve_code (stop_pc)))) | |
6436 | { | |
6437 | /* Any solib trampoline code can be handled in reverse | |
6438 | by simply continuing to single-step. We have already | |
6439 | executed the solib function (backwards), and a few | |
6440 | steps will take us back through the trampoline to the | |
6441 | caller. */ | |
6442 | keep_going (ecs); | |
6443 | return; | |
6444 | } | |
6445 | ||
16c381f0 | 6446 | if (ecs->event_thread->control.step_over_calls == STEP_OVER_ALL) |
8567c30f | 6447 | { |
b2175913 MS |
6448 | /* We're doing a "next". |
6449 | ||
6450 | Normal (forward) execution: set a breakpoint at the | |
6451 | callee's return address (the address at which the caller | |
6452 | will resume). | |
6453 | ||
6454 | Reverse (backward) execution. set the step-resume | |
6455 | breakpoint at the start of the function that we just | |
6456 | stepped into (backwards), and continue to there. When we | |
6130d0b7 | 6457 | get there, we'll need to single-step back to the caller. */ |
b2175913 MS |
6458 | |
6459 | if (execution_direction == EXEC_REVERSE) | |
6460 | { | |
acf9414f JK |
6461 | /* If we're already at the start of the function, we've either |
6462 | just stepped backward into a single instruction function, | |
6463 | or stepped back out of a signal handler to the first instruction | |
6464 | of the function. Just keep going, which will single-step back | |
6465 | to the caller. */ | |
58c48e72 | 6466 | if (ecs->stop_func_start != stop_pc && ecs->stop_func_start != 0) |
acf9414f | 6467 | { |
acf9414f | 6468 | /* Normal function call return (static or dynamic). */ |
51abb421 | 6469 | symtab_and_line sr_sal; |
acf9414f JK |
6470 | sr_sal.pc = ecs->stop_func_start; |
6471 | sr_sal.pspace = get_frame_program_space (frame); | |
6472 | insert_step_resume_breakpoint_at_sal (gdbarch, | |
6473 | sr_sal, null_frame_id); | |
6474 | } | |
b2175913 MS |
6475 | } |
6476 | else | |
568d6575 | 6477 | insert_step_resume_breakpoint_at_caller (frame); |
b2175913 | 6478 | |
8567c30f AC |
6479 | keep_going (ecs); |
6480 | return; | |
6481 | } | |
a53c66de | 6482 | |
95918acb | 6483 | /* If we are in a function call trampoline (a stub between the |
8fb3e588 AC |
6484 | calling routine and the real function), locate the real |
6485 | function. That's what tells us (a) whether we want to step | |
6486 | into it at all, and (b) what prologue we want to run to the | |
6487 | end of, if we do step into it. */ | |
568d6575 | 6488 | real_stop_pc = skip_language_trampoline (frame, stop_pc); |
95918acb | 6489 | if (real_stop_pc == 0) |
568d6575 | 6490 | real_stop_pc = gdbarch_skip_trampoline_code (gdbarch, frame, stop_pc); |
95918acb AC |
6491 | if (real_stop_pc != 0) |
6492 | ecs->stop_func_start = real_stop_pc; | |
8fb3e588 | 6493 | |
db5f024e | 6494 | if (real_stop_pc != 0 && in_solib_dynsym_resolve_code (real_stop_pc)) |
1b2bfbb9 | 6495 | { |
51abb421 | 6496 | symtab_and_line sr_sal; |
1b2bfbb9 | 6497 | sr_sal.pc = ecs->stop_func_start; |
6c95b8df | 6498 | sr_sal.pspace = get_frame_program_space (frame); |
1b2bfbb9 | 6499 | |
a6d9a66e UW |
6500 | insert_step_resume_breakpoint_at_sal (gdbarch, |
6501 | sr_sal, null_frame_id); | |
8fb3e588 AC |
6502 | keep_going (ecs); |
6503 | return; | |
1b2bfbb9 RC |
6504 | } |
6505 | ||
95918acb | 6506 | /* If we have line number information for the function we are |
1bfeeb0f JL |
6507 | thinking of stepping into and the function isn't on the skip |
6508 | list, step into it. | |
95918acb | 6509 | |
8fb3e588 AC |
6510 | If there are several symtabs at that PC (e.g. with include |
6511 | files), just want to know whether *any* of them have line | |
6512 | numbers. find_pc_line handles this. */ | |
95918acb AC |
6513 | { |
6514 | struct symtab_and_line tmp_sal; | |
8fb3e588 | 6515 | |
95918acb | 6516 | tmp_sal = find_pc_line (ecs->stop_func_start, 0); |
2b914b52 | 6517 | if (tmp_sal.line != 0 |
85817405 | 6518 | && !function_name_is_marked_for_skip (ecs->stop_func_name, |
de7985c3 | 6519 | tmp_sal)) |
95918acb | 6520 | { |
b2175913 | 6521 | if (execution_direction == EXEC_REVERSE) |
568d6575 | 6522 | handle_step_into_function_backward (gdbarch, ecs); |
b2175913 | 6523 | else |
568d6575 | 6524 | handle_step_into_function (gdbarch, ecs); |
95918acb AC |
6525 | return; |
6526 | } | |
6527 | } | |
6528 | ||
6529 | /* If we have no line number and the step-stop-if-no-debug is | |
8fb3e588 AC |
6530 | set, we stop the step so that the user has a chance to switch |
6531 | in assembly mode. */ | |
16c381f0 | 6532 | if (ecs->event_thread->control.step_over_calls == STEP_OVER_UNDEBUGGABLE |
078130d0 | 6533 | && step_stop_if_no_debug) |
95918acb | 6534 | { |
bdc36728 | 6535 | end_stepping_range (ecs); |
95918acb AC |
6536 | return; |
6537 | } | |
6538 | ||
b2175913 MS |
6539 | if (execution_direction == EXEC_REVERSE) |
6540 | { | |
acf9414f JK |
6541 | /* If we're already at the start of the function, we've either just |
6542 | stepped backward into a single instruction function without line | |
6543 | number info, or stepped back out of a signal handler to the first | |
6544 | instruction of the function without line number info. Just keep | |
6545 | going, which will single-step back to the caller. */ | |
6546 | if (ecs->stop_func_start != stop_pc) | |
6547 | { | |
6548 | /* Set a breakpoint at callee's start address. | |
6549 | From there we can step once and be back in the caller. */ | |
51abb421 | 6550 | symtab_and_line sr_sal; |
acf9414f JK |
6551 | sr_sal.pc = ecs->stop_func_start; |
6552 | sr_sal.pspace = get_frame_program_space (frame); | |
6553 | insert_step_resume_breakpoint_at_sal (gdbarch, | |
6554 | sr_sal, null_frame_id); | |
6555 | } | |
b2175913 MS |
6556 | } |
6557 | else | |
6558 | /* Set a breakpoint at callee's return address (the address | |
6559 | at which the caller will resume). */ | |
568d6575 | 6560 | insert_step_resume_breakpoint_at_caller (frame); |
b2175913 | 6561 | |
95918acb | 6562 | keep_going (ecs); |
488f131b | 6563 | return; |
488f131b | 6564 | } |
c906108c | 6565 | |
fdd654f3 MS |
6566 | /* Reverse stepping through solib trampolines. */ |
6567 | ||
6568 | if (execution_direction == EXEC_REVERSE | |
16c381f0 | 6569 | && ecs->event_thread->control.step_over_calls != STEP_OVER_NONE) |
fdd654f3 | 6570 | { |
f2ffa92b PA |
6571 | CORE_ADDR stop_pc = ecs->event_thread->suspend.stop_pc; |
6572 | ||
fdd654f3 MS |
6573 | if (gdbarch_skip_trampoline_code (gdbarch, frame, stop_pc) |
6574 | || (ecs->stop_func_start == 0 | |
6575 | && in_solib_dynsym_resolve_code (stop_pc))) | |
6576 | { | |
6577 | /* Any solib trampoline code can be handled in reverse | |
6578 | by simply continuing to single-step. We have already | |
6579 | executed the solib function (backwards), and a few | |
6580 | steps will take us back through the trampoline to the | |
6581 | caller. */ | |
6582 | keep_going (ecs); | |
6583 | return; | |
6584 | } | |
6585 | else if (in_solib_dynsym_resolve_code (stop_pc)) | |
6586 | { | |
6587 | /* Stepped backward into the solib dynsym resolver. | |
6588 | Set a breakpoint at its start and continue, then | |
6589 | one more step will take us out. */ | |
51abb421 | 6590 | symtab_and_line sr_sal; |
fdd654f3 | 6591 | sr_sal.pc = ecs->stop_func_start; |
9d1807c3 | 6592 | sr_sal.pspace = get_frame_program_space (frame); |
fdd654f3 MS |
6593 | insert_step_resume_breakpoint_at_sal (gdbarch, |
6594 | sr_sal, null_frame_id); | |
6595 | keep_going (ecs); | |
6596 | return; | |
6597 | } | |
6598 | } | |
6599 | ||
f2ffa92b | 6600 | stop_pc_sal = find_pc_line (ecs->event_thread->suspend.stop_pc, 0); |
7ed0fe66 | 6601 | |
1b2bfbb9 RC |
6602 | /* NOTE: tausq/2004-05-24: This if block used to be done before all |
6603 | the trampoline processing logic, however, there are some trampolines | |
6604 | that have no names, so we should do trampoline handling first. */ | |
16c381f0 | 6605 | if (ecs->event_thread->control.step_over_calls == STEP_OVER_UNDEBUGGABLE |
7ed0fe66 | 6606 | && ecs->stop_func_name == NULL |
2afb61aa | 6607 | && stop_pc_sal.line == 0) |
1b2bfbb9 | 6608 | { |
527159b7 | 6609 | if (debug_infrun) |
3e43a32a MS |
6610 | fprintf_unfiltered (gdb_stdlog, |
6611 | "infrun: stepped into undebuggable function\n"); | |
527159b7 | 6612 | |
1b2bfbb9 | 6613 | /* The inferior just stepped into, or returned to, an |
7ed0fe66 DJ |
6614 | undebuggable function (where there is no debugging information |
6615 | and no line number corresponding to the address where the | |
1b2bfbb9 RC |
6616 | inferior stopped). Since we want to skip this kind of code, |
6617 | we keep going until the inferior returns from this | |
14e60db5 DJ |
6618 | function - unless the user has asked us not to (via |
6619 | set step-mode) or we no longer know how to get back | |
6620 | to the call site. */ | |
6621 | if (step_stop_if_no_debug | |
c7ce8faa | 6622 | || !frame_id_p (frame_unwind_caller_id (frame))) |
1b2bfbb9 RC |
6623 | { |
6624 | /* If we have no line number and the step-stop-if-no-debug | |
6625 | is set, we stop the step so that the user has a chance to | |
6626 | switch in assembly mode. */ | |
bdc36728 | 6627 | end_stepping_range (ecs); |
1b2bfbb9 RC |
6628 | return; |
6629 | } | |
6630 | else | |
6631 | { | |
6632 | /* Set a breakpoint at callee's return address (the address | |
6633 | at which the caller will resume). */ | |
568d6575 | 6634 | insert_step_resume_breakpoint_at_caller (frame); |
1b2bfbb9 RC |
6635 | keep_going (ecs); |
6636 | return; | |
6637 | } | |
6638 | } | |
6639 | ||
16c381f0 | 6640 | if (ecs->event_thread->control.step_range_end == 1) |
1b2bfbb9 RC |
6641 | { |
6642 | /* It is stepi or nexti. We always want to stop stepping after | |
6643 | one instruction. */ | |
527159b7 | 6644 | if (debug_infrun) |
8a9de0e4 | 6645 | fprintf_unfiltered (gdb_stdlog, "infrun: stepi/nexti\n"); |
bdc36728 | 6646 | end_stepping_range (ecs); |
1b2bfbb9 RC |
6647 | return; |
6648 | } | |
6649 | ||
2afb61aa | 6650 | if (stop_pc_sal.line == 0) |
488f131b JB |
6651 | { |
6652 | /* We have no line number information. That means to stop | |
6653 | stepping (does this always happen right after one instruction, | |
6654 | when we do "s" in a function with no line numbers, | |
6655 | or can this happen as a result of a return or longjmp?). */ | |
527159b7 | 6656 | if (debug_infrun) |
8a9de0e4 | 6657 | fprintf_unfiltered (gdb_stdlog, "infrun: no line number info\n"); |
bdc36728 | 6658 | end_stepping_range (ecs); |
488f131b JB |
6659 | return; |
6660 | } | |
c906108c | 6661 | |
edb3359d DJ |
6662 | /* Look for "calls" to inlined functions, part one. If the inline |
6663 | frame machinery detected some skipped call sites, we have entered | |
6664 | a new inline function. */ | |
6665 | ||
6666 | if (frame_id_eq (get_frame_id (get_current_frame ()), | |
16c381f0 | 6667 | ecs->event_thread->control.step_frame_id) |
00431a78 | 6668 | && inline_skipped_frames (ecs->event_thread)) |
edb3359d | 6669 | { |
edb3359d DJ |
6670 | if (debug_infrun) |
6671 | fprintf_unfiltered (gdb_stdlog, | |
6672 | "infrun: stepped into inlined function\n"); | |
6673 | ||
51abb421 | 6674 | symtab_and_line call_sal = find_frame_sal (get_current_frame ()); |
edb3359d | 6675 | |
16c381f0 | 6676 | if (ecs->event_thread->control.step_over_calls != STEP_OVER_ALL) |
edb3359d DJ |
6677 | { |
6678 | /* For "step", we're going to stop. But if the call site | |
6679 | for this inlined function is on the same source line as | |
6680 | we were previously stepping, go down into the function | |
6681 | first. Otherwise stop at the call site. */ | |
6682 | ||
6683 | if (call_sal.line == ecs->event_thread->current_line | |
6684 | && call_sal.symtab == ecs->event_thread->current_symtab) | |
00431a78 | 6685 | step_into_inline_frame (ecs->event_thread); |
edb3359d | 6686 | |
bdc36728 | 6687 | end_stepping_range (ecs); |
edb3359d DJ |
6688 | return; |
6689 | } | |
6690 | else | |
6691 | { | |
6692 | /* For "next", we should stop at the call site if it is on a | |
6693 | different source line. Otherwise continue through the | |
6694 | inlined function. */ | |
6695 | if (call_sal.line == ecs->event_thread->current_line | |
6696 | && call_sal.symtab == ecs->event_thread->current_symtab) | |
6697 | keep_going (ecs); | |
6698 | else | |
bdc36728 | 6699 | end_stepping_range (ecs); |
edb3359d DJ |
6700 | return; |
6701 | } | |
6702 | } | |
6703 | ||
6704 | /* Look for "calls" to inlined functions, part two. If we are still | |
6705 | in the same real function we were stepping through, but we have | |
6706 | to go further up to find the exact frame ID, we are stepping | |
6707 | through a more inlined call beyond its call site. */ | |
6708 | ||
6709 | if (get_frame_type (get_current_frame ()) == INLINE_FRAME | |
6710 | && !frame_id_eq (get_frame_id (get_current_frame ()), | |
16c381f0 | 6711 | ecs->event_thread->control.step_frame_id) |
edb3359d | 6712 | && stepped_in_from (get_current_frame (), |
16c381f0 | 6713 | ecs->event_thread->control.step_frame_id)) |
edb3359d DJ |
6714 | { |
6715 | if (debug_infrun) | |
6716 | fprintf_unfiltered (gdb_stdlog, | |
6717 | "infrun: stepping through inlined function\n"); | |
6718 | ||
16c381f0 | 6719 | if (ecs->event_thread->control.step_over_calls == STEP_OVER_ALL) |
edb3359d DJ |
6720 | keep_going (ecs); |
6721 | else | |
bdc36728 | 6722 | end_stepping_range (ecs); |
edb3359d DJ |
6723 | return; |
6724 | } | |
6725 | ||
f2ffa92b | 6726 | if ((ecs->event_thread->suspend.stop_pc == stop_pc_sal.pc) |
4e1c45ea PA |
6727 | && (ecs->event_thread->current_line != stop_pc_sal.line |
6728 | || ecs->event_thread->current_symtab != stop_pc_sal.symtab)) | |
488f131b JB |
6729 | { |
6730 | /* We are at the start of a different line. So stop. Note that | |
6731 | we don't stop if we step into the middle of a different line. | |
6732 | That is said to make things like for (;;) statements work | |
6733 | better. */ | |
527159b7 | 6734 | if (debug_infrun) |
3e43a32a MS |
6735 | fprintf_unfiltered (gdb_stdlog, |
6736 | "infrun: stepped to a different line\n"); | |
bdc36728 | 6737 | end_stepping_range (ecs); |
488f131b JB |
6738 | return; |
6739 | } | |
c906108c | 6740 | |
488f131b | 6741 | /* We aren't done stepping. |
c906108c | 6742 | |
488f131b JB |
6743 | Optimize by setting the stepping range to the line. |
6744 | (We might not be in the original line, but if we entered a | |
6745 | new line in mid-statement, we continue stepping. This makes | |
6746 | things like for(;;) statements work better.) */ | |
c906108c | 6747 | |
16c381f0 JK |
6748 | ecs->event_thread->control.step_range_start = stop_pc_sal.pc; |
6749 | ecs->event_thread->control.step_range_end = stop_pc_sal.end; | |
c1e36e3e | 6750 | ecs->event_thread->control.may_range_step = 1; |
edb3359d | 6751 | set_step_info (frame, stop_pc_sal); |
488f131b | 6752 | |
527159b7 | 6753 | if (debug_infrun) |
8a9de0e4 | 6754 | fprintf_unfiltered (gdb_stdlog, "infrun: keep going\n"); |
488f131b | 6755 | keep_going (ecs); |
104c1213 JM |
6756 | } |
6757 | ||
c447ac0b PA |
6758 | /* In all-stop mode, if we're currently stepping but have stopped in |
6759 | some other thread, we may need to switch back to the stepped | |
6760 | thread. Returns true we set the inferior running, false if we left | |
6761 | it stopped (and the event needs further processing). */ | |
6762 | ||
6763 | static int | |
6764 | switch_back_to_stepped_thread (struct execution_control_state *ecs) | |
6765 | { | |
fbea99ea | 6766 | if (!target_is_non_stop_p ()) |
c447ac0b | 6767 | { |
99619bea PA |
6768 | struct thread_info *stepping_thread; |
6769 | ||
6770 | /* If any thread is blocked on some internal breakpoint, and we | |
6771 | simply need to step over that breakpoint to get it going | |
6772 | again, do that first. */ | |
6773 | ||
6774 | /* However, if we see an event for the stepping thread, then we | |
6775 | know all other threads have been moved past their breakpoints | |
6776 | already. Let the caller check whether the step is finished, | |
6777 | etc., before deciding to move it past a breakpoint. */ | |
6778 | if (ecs->event_thread->control.step_range_end != 0) | |
6779 | return 0; | |
6780 | ||
6781 | /* Check if the current thread is blocked on an incomplete | |
6782 | step-over, interrupted by a random signal. */ | |
6783 | if (ecs->event_thread->control.trap_expected | |
6784 | && ecs->event_thread->suspend.stop_signal != GDB_SIGNAL_TRAP) | |
c447ac0b | 6785 | { |
99619bea PA |
6786 | if (debug_infrun) |
6787 | { | |
6788 | fprintf_unfiltered (gdb_stdlog, | |
6789 | "infrun: need to finish step-over of [%s]\n", | |
a068643d | 6790 | target_pid_to_str (ecs->event_thread->ptid).c_str ()); |
99619bea PA |
6791 | } |
6792 | keep_going (ecs); | |
6793 | return 1; | |
6794 | } | |
2adfaa28 | 6795 | |
99619bea PA |
6796 | /* Check if the current thread is blocked by a single-step |
6797 | breakpoint of another thread. */ | |
6798 | if (ecs->hit_singlestep_breakpoint) | |
6799 | { | |
6800 | if (debug_infrun) | |
6801 | { | |
6802 | fprintf_unfiltered (gdb_stdlog, | |
6803 | "infrun: need to step [%s] over single-step " | |
6804 | "breakpoint\n", | |
a068643d | 6805 | target_pid_to_str (ecs->ptid).c_str ()); |
99619bea PA |
6806 | } |
6807 | keep_going (ecs); | |
6808 | return 1; | |
6809 | } | |
6810 | ||
4d9d9d04 PA |
6811 | /* If this thread needs yet another step-over (e.g., stepping |
6812 | through a delay slot), do it first before moving on to | |
6813 | another thread. */ | |
6814 | if (thread_still_needs_step_over (ecs->event_thread)) | |
6815 | { | |
6816 | if (debug_infrun) | |
6817 | { | |
6818 | fprintf_unfiltered (gdb_stdlog, | |
6819 | "infrun: thread [%s] still needs step-over\n", | |
a068643d | 6820 | target_pid_to_str (ecs->event_thread->ptid).c_str ()); |
4d9d9d04 PA |
6821 | } |
6822 | keep_going (ecs); | |
6823 | return 1; | |
6824 | } | |
70509625 | 6825 | |
483805cf PA |
6826 | /* If scheduler locking applies even if not stepping, there's no |
6827 | need to walk over threads. Above we've checked whether the | |
6828 | current thread is stepping. If some other thread not the | |
6829 | event thread is stepping, then it must be that scheduler | |
6830 | locking is not in effect. */ | |
856e7dd6 | 6831 | if (schedlock_applies (ecs->event_thread)) |
483805cf PA |
6832 | return 0; |
6833 | ||
4d9d9d04 PA |
6834 | /* Otherwise, we no longer expect a trap in the current thread. |
6835 | Clear the trap_expected flag before switching back -- this is | |
6836 | what keep_going does as well, if we call it. */ | |
6837 | ecs->event_thread->control.trap_expected = 0; | |
6838 | ||
6839 | /* Likewise, clear the signal if it should not be passed. */ | |
6840 | if (!signal_program[ecs->event_thread->suspend.stop_signal]) | |
6841 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; | |
6842 | ||
6843 | /* Do all pending step-overs before actually proceeding with | |
483805cf | 6844 | step/next/etc. */ |
4d9d9d04 PA |
6845 | if (start_step_over ()) |
6846 | { | |
6847 | prepare_to_wait (ecs); | |
6848 | return 1; | |
6849 | } | |
6850 | ||
6851 | /* Look for the stepping/nexting thread. */ | |
483805cf | 6852 | stepping_thread = NULL; |
4d9d9d04 | 6853 | |
08036331 | 6854 | for (thread_info *tp : all_non_exited_threads ()) |
483805cf | 6855 | { |
fbea99ea PA |
6856 | /* Ignore threads of processes the caller is not |
6857 | resuming. */ | |
483805cf | 6858 | if (!sched_multi |
e99b03dc | 6859 | && tp->ptid.pid () != ecs->ptid.pid ()) |
483805cf PA |
6860 | continue; |
6861 | ||
6862 | /* When stepping over a breakpoint, we lock all threads | |
6863 | except the one that needs to move past the breakpoint. | |
6864 | If a non-event thread has this set, the "incomplete | |
6865 | step-over" check above should have caught it earlier. */ | |
372316f1 PA |
6866 | if (tp->control.trap_expected) |
6867 | { | |
6868 | internal_error (__FILE__, __LINE__, | |
6869 | "[%s] has inconsistent state: " | |
6870 | "trap_expected=%d\n", | |
a068643d | 6871 | target_pid_to_str (tp->ptid).c_str (), |
372316f1 PA |
6872 | tp->control.trap_expected); |
6873 | } | |
483805cf PA |
6874 | |
6875 | /* Did we find the stepping thread? */ | |
6876 | if (tp->control.step_range_end) | |
6877 | { | |
6878 | /* Yep. There should only one though. */ | |
6879 | gdb_assert (stepping_thread == NULL); | |
6880 | ||
6881 | /* The event thread is handled at the top, before we | |
6882 | enter this loop. */ | |
6883 | gdb_assert (tp != ecs->event_thread); | |
6884 | ||
6885 | /* If some thread other than the event thread is | |
6886 | stepping, then scheduler locking can't be in effect, | |
6887 | otherwise we wouldn't have resumed the current event | |
6888 | thread in the first place. */ | |
856e7dd6 | 6889 | gdb_assert (!schedlock_applies (tp)); |
483805cf PA |
6890 | |
6891 | stepping_thread = tp; | |
6892 | } | |
99619bea PA |
6893 | } |
6894 | ||
483805cf | 6895 | if (stepping_thread != NULL) |
99619bea | 6896 | { |
c447ac0b PA |
6897 | if (debug_infrun) |
6898 | fprintf_unfiltered (gdb_stdlog, | |
6899 | "infrun: switching back to stepped thread\n"); | |
6900 | ||
2ac7589c PA |
6901 | if (keep_going_stepped_thread (stepping_thread)) |
6902 | { | |
6903 | prepare_to_wait (ecs); | |
6904 | return 1; | |
6905 | } | |
6906 | } | |
6907 | } | |
2adfaa28 | 6908 | |
2ac7589c PA |
6909 | return 0; |
6910 | } | |
2adfaa28 | 6911 | |
2ac7589c PA |
6912 | /* Set a previously stepped thread back to stepping. Returns true on |
6913 | success, false if the resume is not possible (e.g., the thread | |
6914 | vanished). */ | |
6915 | ||
6916 | static int | |
6917 | keep_going_stepped_thread (struct thread_info *tp) | |
6918 | { | |
6919 | struct frame_info *frame; | |
2ac7589c PA |
6920 | struct execution_control_state ecss; |
6921 | struct execution_control_state *ecs = &ecss; | |
2adfaa28 | 6922 | |
2ac7589c PA |
6923 | /* If the stepping thread exited, then don't try to switch back and |
6924 | resume it, which could fail in several different ways depending | |
6925 | on the target. Instead, just keep going. | |
2adfaa28 | 6926 | |
2ac7589c PA |
6927 | We can find a stepping dead thread in the thread list in two |
6928 | cases: | |
2adfaa28 | 6929 | |
2ac7589c PA |
6930 | - The target supports thread exit events, and when the target |
6931 | tries to delete the thread from the thread list, inferior_ptid | |
6932 | pointed at the exiting thread. In such case, calling | |
6933 | delete_thread does not really remove the thread from the list; | |
6934 | instead, the thread is left listed, with 'exited' state. | |
64ce06e4 | 6935 | |
2ac7589c PA |
6936 | - The target's debug interface does not support thread exit |
6937 | events, and so we have no idea whatsoever if the previously | |
6938 | stepping thread is still alive. For that reason, we need to | |
6939 | synchronously query the target now. */ | |
2adfaa28 | 6940 | |
00431a78 | 6941 | if (tp->state == THREAD_EXITED || !target_thread_alive (tp->ptid)) |
2ac7589c PA |
6942 | { |
6943 | if (debug_infrun) | |
6944 | fprintf_unfiltered (gdb_stdlog, | |
6945 | "infrun: not resuming previously " | |
6946 | "stepped thread, it has vanished\n"); | |
6947 | ||
00431a78 | 6948 | delete_thread (tp); |
2ac7589c | 6949 | return 0; |
c447ac0b | 6950 | } |
2ac7589c PA |
6951 | |
6952 | if (debug_infrun) | |
6953 | fprintf_unfiltered (gdb_stdlog, | |
6954 | "infrun: resuming previously stepped thread\n"); | |
6955 | ||
6956 | reset_ecs (ecs, tp); | |
00431a78 | 6957 | switch_to_thread (tp); |
2ac7589c | 6958 | |
f2ffa92b | 6959 | tp->suspend.stop_pc = regcache_read_pc (get_thread_regcache (tp)); |
2ac7589c | 6960 | frame = get_current_frame (); |
2ac7589c PA |
6961 | |
6962 | /* If the PC of the thread we were trying to single-step has | |
6963 | changed, then that thread has trapped or been signaled, but the | |
6964 | event has not been reported to GDB yet. Re-poll the target | |
6965 | looking for this particular thread's event (i.e. temporarily | |
6966 | enable schedlock) by: | |
6967 | ||
6968 | - setting a break at the current PC | |
6969 | - resuming that particular thread, only (by setting trap | |
6970 | expected) | |
6971 | ||
6972 | This prevents us continuously moving the single-step breakpoint | |
6973 | forward, one instruction at a time, overstepping. */ | |
6974 | ||
f2ffa92b | 6975 | if (tp->suspend.stop_pc != tp->prev_pc) |
2ac7589c PA |
6976 | { |
6977 | ptid_t resume_ptid; | |
6978 | ||
6979 | if (debug_infrun) | |
6980 | fprintf_unfiltered (gdb_stdlog, | |
6981 | "infrun: expected thread advanced also (%s -> %s)\n", | |
6982 | paddress (target_gdbarch (), tp->prev_pc), | |
f2ffa92b | 6983 | paddress (target_gdbarch (), tp->suspend.stop_pc)); |
2ac7589c PA |
6984 | |
6985 | /* Clear the info of the previous step-over, as it's no longer | |
6986 | valid (if the thread was trying to step over a breakpoint, it | |
6987 | has already succeeded). It's what keep_going would do too, | |
6988 | if we called it. Do this before trying to insert the sss | |
6989 | breakpoint, otherwise if we were previously trying to step | |
6990 | over this exact address in another thread, the breakpoint is | |
6991 | skipped. */ | |
6992 | clear_step_over_info (); | |
6993 | tp->control.trap_expected = 0; | |
6994 | ||
6995 | insert_single_step_breakpoint (get_frame_arch (frame), | |
6996 | get_frame_address_space (frame), | |
f2ffa92b | 6997 | tp->suspend.stop_pc); |
2ac7589c | 6998 | |
372316f1 | 6999 | tp->resumed = 1; |
fbea99ea | 7000 | resume_ptid = internal_resume_ptid (tp->control.stepping_command); |
2ac7589c PA |
7001 | do_target_resume (resume_ptid, 0, GDB_SIGNAL_0); |
7002 | } | |
7003 | else | |
7004 | { | |
7005 | if (debug_infrun) | |
7006 | fprintf_unfiltered (gdb_stdlog, | |
7007 | "infrun: expected thread still hasn't advanced\n"); | |
7008 | ||
7009 | keep_going_pass_signal (ecs); | |
7010 | } | |
7011 | return 1; | |
c447ac0b PA |
7012 | } |
7013 | ||
8b061563 PA |
7014 | /* Is thread TP in the middle of (software or hardware) |
7015 | single-stepping? (Note the result of this function must never be | |
7016 | passed directly as target_resume's STEP parameter.) */ | |
104c1213 | 7017 | |
a289b8f6 | 7018 | static int |
b3444185 | 7019 | currently_stepping (struct thread_info *tp) |
a7212384 | 7020 | { |
8358c15c JK |
7021 | return ((tp->control.step_range_end |
7022 | && tp->control.step_resume_breakpoint == NULL) | |
7023 | || tp->control.trap_expected | |
af48d08f | 7024 | || tp->stepped_breakpoint |
8358c15c | 7025 | || bpstat_should_step ()); |
a7212384 UW |
7026 | } |
7027 | ||
b2175913 MS |
7028 | /* Inferior has stepped into a subroutine call with source code that |
7029 | we should not step over. Do step to the first line of code in | |
7030 | it. */ | |
c2c6d25f JM |
7031 | |
7032 | static void | |
568d6575 UW |
7033 | handle_step_into_function (struct gdbarch *gdbarch, |
7034 | struct execution_control_state *ecs) | |
c2c6d25f | 7035 | { |
7e324e48 GB |
7036 | fill_in_stop_func (gdbarch, ecs); |
7037 | ||
f2ffa92b PA |
7038 | compunit_symtab *cust |
7039 | = find_pc_compunit_symtab (ecs->event_thread->suspend.stop_pc); | |
43f3e411 | 7040 | if (cust != NULL && compunit_language (cust) != language_asm) |
46a62268 YQ |
7041 | ecs->stop_func_start |
7042 | = gdbarch_skip_prologue_noexcept (gdbarch, ecs->stop_func_start); | |
c2c6d25f | 7043 | |
51abb421 | 7044 | symtab_and_line stop_func_sal = find_pc_line (ecs->stop_func_start, 0); |
c2c6d25f JM |
7045 | /* Use the step_resume_break to step until the end of the prologue, |
7046 | even if that involves jumps (as it seems to on the vax under | |
7047 | 4.2). */ | |
7048 | /* If the prologue ends in the middle of a source line, continue to | |
7049 | the end of that source line (if it is still within the function). | |
7050 | Otherwise, just go to end of prologue. */ | |
2afb61aa PA |
7051 | if (stop_func_sal.end |
7052 | && stop_func_sal.pc != ecs->stop_func_start | |
7053 | && stop_func_sal.end < ecs->stop_func_end) | |
7054 | ecs->stop_func_start = stop_func_sal.end; | |
c2c6d25f | 7055 | |
2dbd5e30 KB |
7056 | /* Architectures which require breakpoint adjustment might not be able |
7057 | to place a breakpoint at the computed address. If so, the test | |
7058 | ``ecs->stop_func_start == stop_pc'' will never succeed. Adjust | |
7059 | ecs->stop_func_start to an address at which a breakpoint may be | |
7060 | legitimately placed. | |
8fb3e588 | 7061 | |
2dbd5e30 KB |
7062 | Note: kevinb/2004-01-19: On FR-V, if this adjustment is not |
7063 | made, GDB will enter an infinite loop when stepping through | |
7064 | optimized code consisting of VLIW instructions which contain | |
7065 | subinstructions corresponding to different source lines. On | |
7066 | FR-V, it's not permitted to place a breakpoint on any but the | |
7067 | first subinstruction of a VLIW instruction. When a breakpoint is | |
7068 | set, GDB will adjust the breakpoint address to the beginning of | |
7069 | the VLIW instruction. Thus, we need to make the corresponding | |
7070 | adjustment here when computing the stop address. */ | |
8fb3e588 | 7071 | |
568d6575 | 7072 | if (gdbarch_adjust_breakpoint_address_p (gdbarch)) |
2dbd5e30 KB |
7073 | { |
7074 | ecs->stop_func_start | |
568d6575 | 7075 | = gdbarch_adjust_breakpoint_address (gdbarch, |
8fb3e588 | 7076 | ecs->stop_func_start); |
2dbd5e30 KB |
7077 | } |
7078 | ||
f2ffa92b | 7079 | if (ecs->stop_func_start == ecs->event_thread->suspend.stop_pc) |
c2c6d25f JM |
7080 | { |
7081 | /* We are already there: stop now. */ | |
bdc36728 | 7082 | end_stepping_range (ecs); |
c2c6d25f JM |
7083 | return; |
7084 | } | |
7085 | else | |
7086 | { | |
7087 | /* Put the step-breakpoint there and go until there. */ | |
51abb421 | 7088 | symtab_and_line sr_sal; |
c2c6d25f JM |
7089 | sr_sal.pc = ecs->stop_func_start; |
7090 | sr_sal.section = find_pc_overlay (ecs->stop_func_start); | |
6c95b8df | 7091 | sr_sal.pspace = get_frame_program_space (get_current_frame ()); |
44cbf7b5 | 7092 | |
c2c6d25f | 7093 | /* Do not specify what the fp should be when we stop since on |
488f131b JB |
7094 | some machines the prologue is where the new fp value is |
7095 | established. */ | |
a6d9a66e | 7096 | insert_step_resume_breakpoint_at_sal (gdbarch, sr_sal, null_frame_id); |
c2c6d25f JM |
7097 | |
7098 | /* And make sure stepping stops right away then. */ | |
16c381f0 JK |
7099 | ecs->event_thread->control.step_range_end |
7100 | = ecs->event_thread->control.step_range_start; | |
c2c6d25f JM |
7101 | } |
7102 | keep_going (ecs); | |
7103 | } | |
d4f3574e | 7104 | |
b2175913 MS |
7105 | /* Inferior has stepped backward into a subroutine call with source |
7106 | code that we should not step over. Do step to the beginning of the | |
7107 | last line of code in it. */ | |
7108 | ||
7109 | static void | |
568d6575 UW |
7110 | handle_step_into_function_backward (struct gdbarch *gdbarch, |
7111 | struct execution_control_state *ecs) | |
b2175913 | 7112 | { |
43f3e411 | 7113 | struct compunit_symtab *cust; |
167e4384 | 7114 | struct symtab_and_line stop_func_sal; |
b2175913 | 7115 | |
7e324e48 GB |
7116 | fill_in_stop_func (gdbarch, ecs); |
7117 | ||
f2ffa92b | 7118 | cust = find_pc_compunit_symtab (ecs->event_thread->suspend.stop_pc); |
43f3e411 | 7119 | if (cust != NULL && compunit_language (cust) != language_asm) |
46a62268 YQ |
7120 | ecs->stop_func_start |
7121 | = gdbarch_skip_prologue_noexcept (gdbarch, ecs->stop_func_start); | |
b2175913 | 7122 | |
f2ffa92b | 7123 | stop_func_sal = find_pc_line (ecs->event_thread->suspend.stop_pc, 0); |
b2175913 MS |
7124 | |
7125 | /* OK, we're just going to keep stepping here. */ | |
f2ffa92b | 7126 | if (stop_func_sal.pc == ecs->event_thread->suspend.stop_pc) |
b2175913 MS |
7127 | { |
7128 | /* We're there already. Just stop stepping now. */ | |
bdc36728 | 7129 | end_stepping_range (ecs); |
b2175913 MS |
7130 | } |
7131 | else | |
7132 | { | |
7133 | /* Else just reset the step range and keep going. | |
7134 | No step-resume breakpoint, they don't work for | |
7135 | epilogues, which can have multiple entry paths. */ | |
16c381f0 JK |
7136 | ecs->event_thread->control.step_range_start = stop_func_sal.pc; |
7137 | ecs->event_thread->control.step_range_end = stop_func_sal.end; | |
b2175913 MS |
7138 | keep_going (ecs); |
7139 | } | |
7140 | return; | |
7141 | } | |
7142 | ||
d3169d93 | 7143 | /* Insert a "step-resume breakpoint" at SR_SAL with frame ID SR_ID. |
44cbf7b5 AC |
7144 | This is used to both functions and to skip over code. */ |
7145 | ||
7146 | static void | |
2c03e5be PA |
7147 | insert_step_resume_breakpoint_at_sal_1 (struct gdbarch *gdbarch, |
7148 | struct symtab_and_line sr_sal, | |
7149 | struct frame_id sr_id, | |
7150 | enum bptype sr_type) | |
44cbf7b5 | 7151 | { |
611c83ae PA |
7152 | /* There should never be more than one step-resume or longjmp-resume |
7153 | breakpoint per thread, so we should never be setting a new | |
44cbf7b5 | 7154 | step_resume_breakpoint when one is already active. */ |
8358c15c | 7155 | gdb_assert (inferior_thread ()->control.step_resume_breakpoint == NULL); |
2c03e5be | 7156 | gdb_assert (sr_type == bp_step_resume || sr_type == bp_hp_step_resume); |
d3169d93 DJ |
7157 | |
7158 | if (debug_infrun) | |
7159 | fprintf_unfiltered (gdb_stdlog, | |
5af949e3 UW |
7160 | "infrun: inserting step-resume breakpoint at %s\n", |
7161 | paddress (gdbarch, sr_sal.pc)); | |
d3169d93 | 7162 | |
8358c15c | 7163 | inferior_thread ()->control.step_resume_breakpoint |
454dafbd | 7164 | = set_momentary_breakpoint (gdbarch, sr_sal, sr_id, sr_type).release (); |
2c03e5be PA |
7165 | } |
7166 | ||
9da8c2a0 | 7167 | void |
2c03e5be PA |
7168 | insert_step_resume_breakpoint_at_sal (struct gdbarch *gdbarch, |
7169 | struct symtab_and_line sr_sal, | |
7170 | struct frame_id sr_id) | |
7171 | { | |
7172 | insert_step_resume_breakpoint_at_sal_1 (gdbarch, | |
7173 | sr_sal, sr_id, | |
7174 | bp_step_resume); | |
44cbf7b5 | 7175 | } |
7ce450bd | 7176 | |
2c03e5be PA |
7177 | /* Insert a "high-priority step-resume breakpoint" at RETURN_FRAME.pc. |
7178 | This is used to skip a potential signal handler. | |
7ce450bd | 7179 | |
14e60db5 DJ |
7180 | This is called with the interrupted function's frame. The signal |
7181 | handler, when it returns, will resume the interrupted function at | |
7182 | RETURN_FRAME.pc. */ | |
d303a6c7 AC |
7183 | |
7184 | static void | |
2c03e5be | 7185 | insert_hp_step_resume_breakpoint_at_frame (struct frame_info *return_frame) |
d303a6c7 | 7186 | { |
f4c1edd8 | 7187 | gdb_assert (return_frame != NULL); |
d303a6c7 | 7188 | |
51abb421 PA |
7189 | struct gdbarch *gdbarch = get_frame_arch (return_frame); |
7190 | ||
7191 | symtab_and_line sr_sal; | |
568d6575 | 7192 | sr_sal.pc = gdbarch_addr_bits_remove (gdbarch, get_frame_pc (return_frame)); |
d303a6c7 | 7193 | sr_sal.section = find_pc_overlay (sr_sal.pc); |
6c95b8df | 7194 | sr_sal.pspace = get_frame_program_space (return_frame); |
d303a6c7 | 7195 | |
2c03e5be PA |
7196 | insert_step_resume_breakpoint_at_sal_1 (gdbarch, sr_sal, |
7197 | get_stack_frame_id (return_frame), | |
7198 | bp_hp_step_resume); | |
d303a6c7 AC |
7199 | } |
7200 | ||
2c03e5be PA |
7201 | /* Insert a "step-resume breakpoint" at the previous frame's PC. This |
7202 | is used to skip a function after stepping into it (for "next" or if | |
7203 | the called function has no debugging information). | |
14e60db5 DJ |
7204 | |
7205 | The current function has almost always been reached by single | |
7206 | stepping a call or return instruction. NEXT_FRAME belongs to the | |
7207 | current function, and the breakpoint will be set at the caller's | |
7208 | resume address. | |
7209 | ||
7210 | This is a separate function rather than reusing | |
2c03e5be | 7211 | insert_hp_step_resume_breakpoint_at_frame in order to avoid |
14e60db5 | 7212 | get_prev_frame, which may stop prematurely (see the implementation |
c7ce8faa | 7213 | of frame_unwind_caller_id for an example). */ |
14e60db5 DJ |
7214 | |
7215 | static void | |
7216 | insert_step_resume_breakpoint_at_caller (struct frame_info *next_frame) | |
7217 | { | |
14e60db5 DJ |
7218 | /* We shouldn't have gotten here if we don't know where the call site |
7219 | is. */ | |
c7ce8faa | 7220 | gdb_assert (frame_id_p (frame_unwind_caller_id (next_frame))); |
14e60db5 | 7221 | |
51abb421 | 7222 | struct gdbarch *gdbarch = frame_unwind_caller_arch (next_frame); |
14e60db5 | 7223 | |
51abb421 | 7224 | symtab_and_line sr_sal; |
c7ce8faa DJ |
7225 | sr_sal.pc = gdbarch_addr_bits_remove (gdbarch, |
7226 | frame_unwind_caller_pc (next_frame)); | |
14e60db5 | 7227 | sr_sal.section = find_pc_overlay (sr_sal.pc); |
6c95b8df | 7228 | sr_sal.pspace = frame_unwind_program_space (next_frame); |
14e60db5 | 7229 | |
a6d9a66e | 7230 | insert_step_resume_breakpoint_at_sal (gdbarch, sr_sal, |
c7ce8faa | 7231 | frame_unwind_caller_id (next_frame)); |
14e60db5 DJ |
7232 | } |
7233 | ||
611c83ae PA |
7234 | /* Insert a "longjmp-resume" breakpoint at PC. This is used to set a |
7235 | new breakpoint at the target of a jmp_buf. The handling of | |
7236 | longjmp-resume uses the same mechanisms used for handling | |
7237 | "step-resume" breakpoints. */ | |
7238 | ||
7239 | static void | |
a6d9a66e | 7240 | insert_longjmp_resume_breakpoint (struct gdbarch *gdbarch, CORE_ADDR pc) |
611c83ae | 7241 | { |
e81a37f7 TT |
7242 | /* There should never be more than one longjmp-resume breakpoint per |
7243 | thread, so we should never be setting a new | |
611c83ae | 7244 | longjmp_resume_breakpoint when one is already active. */ |
e81a37f7 | 7245 | gdb_assert (inferior_thread ()->control.exception_resume_breakpoint == NULL); |
611c83ae PA |
7246 | |
7247 | if (debug_infrun) | |
7248 | fprintf_unfiltered (gdb_stdlog, | |
5af949e3 UW |
7249 | "infrun: inserting longjmp-resume breakpoint at %s\n", |
7250 | paddress (gdbarch, pc)); | |
611c83ae | 7251 | |
e81a37f7 | 7252 | inferior_thread ()->control.exception_resume_breakpoint = |
454dafbd | 7253 | set_momentary_breakpoint_at_pc (gdbarch, pc, bp_longjmp_resume).release (); |
611c83ae PA |
7254 | } |
7255 | ||
186c406b TT |
7256 | /* Insert an exception resume breakpoint. TP is the thread throwing |
7257 | the exception. The block B is the block of the unwinder debug hook | |
7258 | function. FRAME is the frame corresponding to the call to this | |
7259 | function. SYM is the symbol of the function argument holding the | |
7260 | target PC of the exception. */ | |
7261 | ||
7262 | static void | |
7263 | insert_exception_resume_breakpoint (struct thread_info *tp, | |
3977b71f | 7264 | const struct block *b, |
186c406b TT |
7265 | struct frame_info *frame, |
7266 | struct symbol *sym) | |
7267 | { | |
a70b8144 | 7268 | try |
186c406b | 7269 | { |
63e43d3a | 7270 | struct block_symbol vsym; |
186c406b TT |
7271 | struct value *value; |
7272 | CORE_ADDR handler; | |
7273 | struct breakpoint *bp; | |
7274 | ||
de63c46b PA |
7275 | vsym = lookup_symbol_search_name (SYMBOL_SEARCH_NAME (sym), |
7276 | b, VAR_DOMAIN); | |
63e43d3a | 7277 | value = read_var_value (vsym.symbol, vsym.block, frame); |
186c406b TT |
7278 | /* If the value was optimized out, revert to the old behavior. */ |
7279 | if (! value_optimized_out (value)) | |
7280 | { | |
7281 | handler = value_as_address (value); | |
7282 | ||
7283 | if (debug_infrun) | |
7284 | fprintf_unfiltered (gdb_stdlog, | |
7285 | "infrun: exception resume at %lx\n", | |
7286 | (unsigned long) handler); | |
7287 | ||
7288 | bp = set_momentary_breakpoint_at_pc (get_frame_arch (frame), | |
454dafbd TT |
7289 | handler, |
7290 | bp_exception_resume).release (); | |
c70a6932 JK |
7291 | |
7292 | /* set_momentary_breakpoint_at_pc invalidates FRAME. */ | |
7293 | frame = NULL; | |
7294 | ||
5d5658a1 | 7295 | bp->thread = tp->global_num; |
186c406b TT |
7296 | inferior_thread ()->control.exception_resume_breakpoint = bp; |
7297 | } | |
7298 | } | |
230d2906 | 7299 | catch (const gdb_exception_error &e) |
492d29ea PA |
7300 | { |
7301 | /* We want to ignore errors here. */ | |
7302 | } | |
186c406b TT |
7303 | } |
7304 | ||
28106bc2 SDJ |
7305 | /* A helper for check_exception_resume that sets an |
7306 | exception-breakpoint based on a SystemTap probe. */ | |
7307 | ||
7308 | static void | |
7309 | insert_exception_resume_from_probe (struct thread_info *tp, | |
729662a5 | 7310 | const struct bound_probe *probe, |
28106bc2 SDJ |
7311 | struct frame_info *frame) |
7312 | { | |
7313 | struct value *arg_value; | |
7314 | CORE_ADDR handler; | |
7315 | struct breakpoint *bp; | |
7316 | ||
7317 | arg_value = probe_safe_evaluate_at_pc (frame, 1); | |
7318 | if (!arg_value) | |
7319 | return; | |
7320 | ||
7321 | handler = value_as_address (arg_value); | |
7322 | ||
7323 | if (debug_infrun) | |
7324 | fprintf_unfiltered (gdb_stdlog, | |
7325 | "infrun: exception resume at %s\n", | |
6bac7473 | 7326 | paddress (get_objfile_arch (probe->objfile), |
28106bc2 SDJ |
7327 | handler)); |
7328 | ||
7329 | bp = set_momentary_breakpoint_at_pc (get_frame_arch (frame), | |
454dafbd | 7330 | handler, bp_exception_resume).release (); |
5d5658a1 | 7331 | bp->thread = tp->global_num; |
28106bc2 SDJ |
7332 | inferior_thread ()->control.exception_resume_breakpoint = bp; |
7333 | } | |
7334 | ||
186c406b TT |
7335 | /* This is called when an exception has been intercepted. Check to |
7336 | see whether the exception's destination is of interest, and if so, | |
7337 | set an exception resume breakpoint there. */ | |
7338 | ||
7339 | static void | |
7340 | check_exception_resume (struct execution_control_state *ecs, | |
28106bc2 | 7341 | struct frame_info *frame) |
186c406b | 7342 | { |
729662a5 | 7343 | struct bound_probe probe; |
28106bc2 SDJ |
7344 | struct symbol *func; |
7345 | ||
7346 | /* First see if this exception unwinding breakpoint was set via a | |
7347 | SystemTap probe point. If so, the probe has two arguments: the | |
7348 | CFA and the HANDLER. We ignore the CFA, extract the handler, and | |
7349 | set a breakpoint there. */ | |
6bac7473 | 7350 | probe = find_probe_by_pc (get_frame_pc (frame)); |
935676c9 | 7351 | if (probe.prob) |
28106bc2 | 7352 | { |
729662a5 | 7353 | insert_exception_resume_from_probe (ecs->event_thread, &probe, frame); |
28106bc2 SDJ |
7354 | return; |
7355 | } | |
7356 | ||
7357 | func = get_frame_function (frame); | |
7358 | if (!func) | |
7359 | return; | |
186c406b | 7360 | |
a70b8144 | 7361 | try |
186c406b | 7362 | { |
3977b71f | 7363 | const struct block *b; |
8157b174 | 7364 | struct block_iterator iter; |
186c406b TT |
7365 | struct symbol *sym; |
7366 | int argno = 0; | |
7367 | ||
7368 | /* The exception breakpoint is a thread-specific breakpoint on | |
7369 | the unwinder's debug hook, declared as: | |
7370 | ||
7371 | void _Unwind_DebugHook (void *cfa, void *handler); | |
7372 | ||
7373 | The CFA argument indicates the frame to which control is | |
7374 | about to be transferred. HANDLER is the destination PC. | |
7375 | ||
7376 | We ignore the CFA and set a temporary breakpoint at HANDLER. | |
7377 | This is not extremely efficient but it avoids issues in gdb | |
7378 | with computing the DWARF CFA, and it also works even in weird | |
7379 | cases such as throwing an exception from inside a signal | |
7380 | handler. */ | |
7381 | ||
7382 | b = SYMBOL_BLOCK_VALUE (func); | |
7383 | ALL_BLOCK_SYMBOLS (b, iter, sym) | |
7384 | { | |
7385 | if (!SYMBOL_IS_ARGUMENT (sym)) | |
7386 | continue; | |
7387 | ||
7388 | if (argno == 0) | |
7389 | ++argno; | |
7390 | else | |
7391 | { | |
7392 | insert_exception_resume_breakpoint (ecs->event_thread, | |
7393 | b, frame, sym); | |
7394 | break; | |
7395 | } | |
7396 | } | |
7397 | } | |
230d2906 | 7398 | catch (const gdb_exception_error &e) |
492d29ea PA |
7399 | { |
7400 | } | |
186c406b TT |
7401 | } |
7402 | ||
104c1213 | 7403 | static void |
22bcd14b | 7404 | stop_waiting (struct execution_control_state *ecs) |
104c1213 | 7405 | { |
527159b7 | 7406 | if (debug_infrun) |
22bcd14b | 7407 | fprintf_unfiltered (gdb_stdlog, "infrun: stop_waiting\n"); |
527159b7 | 7408 | |
cd0fc7c3 SS |
7409 | /* Let callers know we don't want to wait for the inferior anymore. */ |
7410 | ecs->wait_some_more = 0; | |
fbea99ea PA |
7411 | |
7412 | /* If all-stop, but the target is always in non-stop mode, stop all | |
7413 | threads now that we're presenting the stop to the user. */ | |
7414 | if (!non_stop && target_is_non_stop_p ()) | |
7415 | stop_all_threads (); | |
cd0fc7c3 SS |
7416 | } |
7417 | ||
4d9d9d04 PA |
7418 | /* Like keep_going, but passes the signal to the inferior, even if the |
7419 | signal is set to nopass. */ | |
d4f3574e SS |
7420 | |
7421 | static void | |
4d9d9d04 | 7422 | keep_going_pass_signal (struct execution_control_state *ecs) |
d4f3574e | 7423 | { |
d7e15655 | 7424 | gdb_assert (ecs->event_thread->ptid == inferior_ptid); |
372316f1 | 7425 | gdb_assert (!ecs->event_thread->resumed); |
4d9d9d04 | 7426 | |
d4f3574e | 7427 | /* Save the pc before execution, to compare with pc after stop. */ |
fb14de7b | 7428 | ecs->event_thread->prev_pc |
00431a78 | 7429 | = regcache_read_pc (get_thread_regcache (ecs->event_thread)); |
d4f3574e | 7430 | |
4d9d9d04 | 7431 | if (ecs->event_thread->control.trap_expected) |
d4f3574e | 7432 | { |
4d9d9d04 PA |
7433 | struct thread_info *tp = ecs->event_thread; |
7434 | ||
7435 | if (debug_infrun) | |
7436 | fprintf_unfiltered (gdb_stdlog, | |
7437 | "infrun: %s has trap_expected set, " | |
7438 | "resuming to collect trap\n", | |
a068643d | 7439 | target_pid_to_str (tp->ptid).c_str ()); |
4d9d9d04 | 7440 | |
a9ba6bae PA |
7441 | /* We haven't yet gotten our trap, and either: intercepted a |
7442 | non-signal event (e.g., a fork); or took a signal which we | |
7443 | are supposed to pass through to the inferior. Simply | |
7444 | continue. */ | |
64ce06e4 | 7445 | resume (ecs->event_thread->suspend.stop_signal); |
d4f3574e | 7446 | } |
372316f1 PA |
7447 | else if (step_over_info_valid_p ()) |
7448 | { | |
7449 | /* Another thread is stepping over a breakpoint in-line. If | |
7450 | this thread needs a step-over too, queue the request. In | |
7451 | either case, this resume must be deferred for later. */ | |
7452 | struct thread_info *tp = ecs->event_thread; | |
7453 | ||
7454 | if (ecs->hit_singlestep_breakpoint | |
7455 | || thread_still_needs_step_over (tp)) | |
7456 | { | |
7457 | if (debug_infrun) | |
7458 | fprintf_unfiltered (gdb_stdlog, | |
7459 | "infrun: step-over already in progress: " | |
7460 | "step-over for %s deferred\n", | |
a068643d | 7461 | target_pid_to_str (tp->ptid).c_str ()); |
372316f1 PA |
7462 | thread_step_over_chain_enqueue (tp); |
7463 | } | |
7464 | else | |
7465 | { | |
7466 | if (debug_infrun) | |
7467 | fprintf_unfiltered (gdb_stdlog, | |
7468 | "infrun: step-over in progress: " | |
7469 | "resume of %s deferred\n", | |
a068643d | 7470 | target_pid_to_str (tp->ptid).c_str ()); |
372316f1 | 7471 | } |
372316f1 | 7472 | } |
d4f3574e SS |
7473 | else |
7474 | { | |
31e77af2 | 7475 | struct regcache *regcache = get_current_regcache (); |
963f9c80 PA |
7476 | int remove_bp; |
7477 | int remove_wps; | |
8d297bbf | 7478 | step_over_what step_what; |
31e77af2 | 7479 | |
d4f3574e | 7480 | /* Either the trap was not expected, but we are continuing |
a9ba6bae PA |
7481 | anyway (if we got a signal, the user asked it be passed to |
7482 | the child) | |
7483 | -- or -- | |
7484 | We got our expected trap, but decided we should resume from | |
7485 | it. | |
d4f3574e | 7486 | |
a9ba6bae | 7487 | We're going to run this baby now! |
d4f3574e | 7488 | |
c36b740a VP |
7489 | Note that insert_breakpoints won't try to re-insert |
7490 | already inserted breakpoints. Therefore, we don't | |
7491 | care if breakpoints were already inserted, or not. */ | |
a9ba6bae | 7492 | |
31e77af2 PA |
7493 | /* If we need to step over a breakpoint, and we're not using |
7494 | displaced stepping to do so, insert all breakpoints | |
7495 | (watchpoints, etc.) but the one we're stepping over, step one | |
7496 | instruction, and then re-insert the breakpoint when that step | |
7497 | is finished. */ | |
963f9c80 | 7498 | |
6c4cfb24 PA |
7499 | step_what = thread_still_needs_step_over (ecs->event_thread); |
7500 | ||
963f9c80 | 7501 | remove_bp = (ecs->hit_singlestep_breakpoint |
6c4cfb24 PA |
7502 | || (step_what & STEP_OVER_BREAKPOINT)); |
7503 | remove_wps = (step_what & STEP_OVER_WATCHPOINT); | |
963f9c80 | 7504 | |
cb71640d PA |
7505 | /* We can't use displaced stepping if we need to step past a |
7506 | watchpoint. The instruction copied to the scratch pad would | |
7507 | still trigger the watchpoint. */ | |
7508 | if (remove_bp | |
3fc8eb30 | 7509 | && (remove_wps || !use_displaced_stepping (ecs->event_thread))) |
45e8c884 | 7510 | { |
a01bda52 | 7511 | set_step_over_info (regcache->aspace (), |
21edc42f YQ |
7512 | regcache_read_pc (regcache), remove_wps, |
7513 | ecs->event_thread->global_num); | |
45e8c884 | 7514 | } |
963f9c80 | 7515 | else if (remove_wps) |
21edc42f | 7516 | set_step_over_info (NULL, 0, remove_wps, -1); |
372316f1 PA |
7517 | |
7518 | /* If we now need to do an in-line step-over, we need to stop | |
7519 | all other threads. Note this must be done before | |
7520 | insert_breakpoints below, because that removes the breakpoint | |
7521 | we're about to step over, otherwise other threads could miss | |
7522 | it. */ | |
fbea99ea | 7523 | if (step_over_info_valid_p () && target_is_non_stop_p ()) |
372316f1 | 7524 | stop_all_threads (); |
abbb1732 | 7525 | |
31e77af2 | 7526 | /* Stop stepping if inserting breakpoints fails. */ |
a70b8144 | 7527 | try |
31e77af2 PA |
7528 | { |
7529 | insert_breakpoints (); | |
7530 | } | |
230d2906 | 7531 | catch (const gdb_exception_error &e) |
31e77af2 PA |
7532 | { |
7533 | exception_print (gdb_stderr, e); | |
22bcd14b | 7534 | stop_waiting (ecs); |
bdf2a94a | 7535 | clear_step_over_info (); |
31e77af2 | 7536 | return; |
d4f3574e SS |
7537 | } |
7538 | ||
963f9c80 | 7539 | ecs->event_thread->control.trap_expected = (remove_bp || remove_wps); |
d4f3574e | 7540 | |
64ce06e4 | 7541 | resume (ecs->event_thread->suspend.stop_signal); |
d4f3574e SS |
7542 | } |
7543 | ||
488f131b | 7544 | prepare_to_wait (ecs); |
d4f3574e SS |
7545 | } |
7546 | ||
4d9d9d04 PA |
7547 | /* Called when we should continue running the inferior, because the |
7548 | current event doesn't cause a user visible stop. This does the | |
7549 | resuming part; waiting for the next event is done elsewhere. */ | |
7550 | ||
7551 | static void | |
7552 | keep_going (struct execution_control_state *ecs) | |
7553 | { | |
7554 | if (ecs->event_thread->control.trap_expected | |
7555 | && ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP) | |
7556 | ecs->event_thread->control.trap_expected = 0; | |
7557 | ||
7558 | if (!signal_program[ecs->event_thread->suspend.stop_signal]) | |
7559 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; | |
7560 | keep_going_pass_signal (ecs); | |
7561 | } | |
7562 | ||
104c1213 JM |
7563 | /* This function normally comes after a resume, before |
7564 | handle_inferior_event exits. It takes care of any last bits of | |
7565 | housekeeping, and sets the all-important wait_some_more flag. */ | |
cd0fc7c3 | 7566 | |
104c1213 JM |
7567 | static void |
7568 | prepare_to_wait (struct execution_control_state *ecs) | |
cd0fc7c3 | 7569 | { |
527159b7 | 7570 | if (debug_infrun) |
8a9de0e4 | 7571 | fprintf_unfiltered (gdb_stdlog, "infrun: prepare_to_wait\n"); |
104c1213 | 7572 | |
104c1213 | 7573 | ecs->wait_some_more = 1; |
0b333c5e PA |
7574 | |
7575 | if (!target_is_async_p ()) | |
7576 | mark_infrun_async_event_handler (); | |
c906108c | 7577 | } |
11cf8741 | 7578 | |
fd664c91 | 7579 | /* We are done with the step range of a step/next/si/ni command. |
b57bacec | 7580 | Called once for each n of a "step n" operation. */ |
fd664c91 PA |
7581 | |
7582 | static void | |
bdc36728 | 7583 | end_stepping_range (struct execution_control_state *ecs) |
fd664c91 | 7584 | { |
bdc36728 | 7585 | ecs->event_thread->control.stop_step = 1; |
bdc36728 | 7586 | stop_waiting (ecs); |
fd664c91 PA |
7587 | } |
7588 | ||
33d62d64 JK |
7589 | /* Several print_*_reason functions to print why the inferior has stopped. |
7590 | We always print something when the inferior exits, or receives a signal. | |
7591 | The rest of the cases are dealt with later on in normal_stop and | |
7592 | print_it_typical. Ideally there should be a call to one of these | |
7593 | print_*_reason functions functions from handle_inferior_event each time | |
22bcd14b | 7594 | stop_waiting is called. |
33d62d64 | 7595 | |
fd664c91 PA |
7596 | Note that we don't call these directly, instead we delegate that to |
7597 | the interpreters, through observers. Interpreters then call these | |
7598 | with whatever uiout is right. */ | |
33d62d64 | 7599 | |
fd664c91 PA |
7600 | void |
7601 | print_end_stepping_range_reason (struct ui_out *uiout) | |
33d62d64 | 7602 | { |
fd664c91 | 7603 | /* For CLI-like interpreters, print nothing. */ |
33d62d64 | 7604 | |
112e8700 | 7605 | if (uiout->is_mi_like_p ()) |
fd664c91 | 7606 | { |
112e8700 | 7607 | uiout->field_string ("reason", |
fd664c91 PA |
7608 | async_reason_lookup (EXEC_ASYNC_END_STEPPING_RANGE)); |
7609 | } | |
7610 | } | |
33d62d64 | 7611 | |
fd664c91 PA |
7612 | void |
7613 | print_signal_exited_reason (struct ui_out *uiout, enum gdb_signal siggnal) | |
11cf8741 | 7614 | { |
33d62d64 | 7615 | annotate_signalled (); |
112e8700 SM |
7616 | if (uiout->is_mi_like_p ()) |
7617 | uiout->field_string | |
7618 | ("reason", async_reason_lookup (EXEC_ASYNC_EXITED_SIGNALLED)); | |
7619 | uiout->text ("\nProgram terminated with signal "); | |
33d62d64 | 7620 | annotate_signal_name (); |
112e8700 | 7621 | uiout->field_string ("signal-name", |
2ea28649 | 7622 | gdb_signal_to_name (siggnal)); |
33d62d64 | 7623 | annotate_signal_name_end (); |
112e8700 | 7624 | uiout->text (", "); |
33d62d64 | 7625 | annotate_signal_string (); |
112e8700 | 7626 | uiout->field_string ("signal-meaning", |
2ea28649 | 7627 | gdb_signal_to_string (siggnal)); |
33d62d64 | 7628 | annotate_signal_string_end (); |
112e8700 SM |
7629 | uiout->text (".\n"); |
7630 | uiout->text ("The program no longer exists.\n"); | |
33d62d64 JK |
7631 | } |
7632 | ||
fd664c91 PA |
7633 | void |
7634 | print_exited_reason (struct ui_out *uiout, int exitstatus) | |
33d62d64 | 7635 | { |
fda326dd | 7636 | struct inferior *inf = current_inferior (); |
a068643d | 7637 | std::string pidstr = target_pid_to_str (ptid_t (inf->pid)); |
fda326dd | 7638 | |
33d62d64 JK |
7639 | annotate_exited (exitstatus); |
7640 | if (exitstatus) | |
7641 | { | |
112e8700 SM |
7642 | if (uiout->is_mi_like_p ()) |
7643 | uiout->field_string ("reason", async_reason_lookup (EXEC_ASYNC_EXITED)); | |
7644 | uiout->text ("[Inferior "); | |
7645 | uiout->text (plongest (inf->num)); | |
7646 | uiout->text (" ("); | |
a068643d | 7647 | uiout->text (pidstr.c_str ()); |
112e8700 SM |
7648 | uiout->text (") exited with code "); |
7649 | uiout->field_fmt ("exit-code", "0%o", (unsigned int) exitstatus); | |
7650 | uiout->text ("]\n"); | |
33d62d64 JK |
7651 | } |
7652 | else | |
11cf8741 | 7653 | { |
112e8700 SM |
7654 | if (uiout->is_mi_like_p ()) |
7655 | uiout->field_string | |
7656 | ("reason", async_reason_lookup (EXEC_ASYNC_EXITED_NORMALLY)); | |
7657 | uiout->text ("[Inferior "); | |
7658 | uiout->text (plongest (inf->num)); | |
7659 | uiout->text (" ("); | |
a068643d | 7660 | uiout->text (pidstr.c_str ()); |
112e8700 | 7661 | uiout->text (") exited normally]\n"); |
33d62d64 | 7662 | } |
33d62d64 JK |
7663 | } |
7664 | ||
012b3a21 WT |
7665 | /* Some targets/architectures can do extra processing/display of |
7666 | segmentation faults. E.g., Intel MPX boundary faults. | |
7667 | Call the architecture dependent function to handle the fault. */ | |
7668 | ||
7669 | static void | |
7670 | handle_segmentation_fault (struct ui_out *uiout) | |
7671 | { | |
7672 | struct regcache *regcache = get_current_regcache (); | |
ac7936df | 7673 | struct gdbarch *gdbarch = regcache->arch (); |
012b3a21 WT |
7674 | |
7675 | if (gdbarch_handle_segmentation_fault_p (gdbarch)) | |
7676 | gdbarch_handle_segmentation_fault (gdbarch, uiout); | |
7677 | } | |
7678 | ||
fd664c91 PA |
7679 | void |
7680 | print_signal_received_reason (struct ui_out *uiout, enum gdb_signal siggnal) | |
33d62d64 | 7681 | { |
f303dbd6 PA |
7682 | struct thread_info *thr = inferior_thread (); |
7683 | ||
33d62d64 JK |
7684 | annotate_signal (); |
7685 | ||
112e8700 | 7686 | if (uiout->is_mi_like_p ()) |
f303dbd6 PA |
7687 | ; |
7688 | else if (show_thread_that_caused_stop ()) | |
33d62d64 | 7689 | { |
f303dbd6 | 7690 | const char *name; |
33d62d64 | 7691 | |
112e8700 SM |
7692 | uiout->text ("\nThread "); |
7693 | uiout->field_fmt ("thread-id", "%s", print_thread_id (thr)); | |
f303dbd6 PA |
7694 | |
7695 | name = thr->name != NULL ? thr->name : target_thread_name (thr); | |
7696 | if (name != NULL) | |
7697 | { | |
112e8700 SM |
7698 | uiout->text (" \""); |
7699 | uiout->field_fmt ("name", "%s", name); | |
7700 | uiout->text ("\""); | |
f303dbd6 | 7701 | } |
33d62d64 | 7702 | } |
f303dbd6 | 7703 | else |
112e8700 | 7704 | uiout->text ("\nProgram"); |
f303dbd6 | 7705 | |
112e8700 SM |
7706 | if (siggnal == GDB_SIGNAL_0 && !uiout->is_mi_like_p ()) |
7707 | uiout->text (" stopped"); | |
33d62d64 JK |
7708 | else |
7709 | { | |
112e8700 | 7710 | uiout->text (" received signal "); |
8b93c638 | 7711 | annotate_signal_name (); |
112e8700 SM |
7712 | if (uiout->is_mi_like_p ()) |
7713 | uiout->field_string | |
7714 | ("reason", async_reason_lookup (EXEC_ASYNC_SIGNAL_RECEIVED)); | |
7715 | uiout->field_string ("signal-name", gdb_signal_to_name (siggnal)); | |
8b93c638 | 7716 | annotate_signal_name_end (); |
112e8700 | 7717 | uiout->text (", "); |
8b93c638 | 7718 | annotate_signal_string (); |
112e8700 | 7719 | uiout->field_string ("signal-meaning", gdb_signal_to_string (siggnal)); |
012b3a21 WT |
7720 | |
7721 | if (siggnal == GDB_SIGNAL_SEGV) | |
7722 | handle_segmentation_fault (uiout); | |
7723 | ||
8b93c638 | 7724 | annotate_signal_string_end (); |
33d62d64 | 7725 | } |
112e8700 | 7726 | uiout->text (".\n"); |
33d62d64 | 7727 | } |
252fbfc8 | 7728 | |
fd664c91 PA |
7729 | void |
7730 | print_no_history_reason (struct ui_out *uiout) | |
33d62d64 | 7731 | { |
112e8700 | 7732 | uiout->text ("\nNo more reverse-execution history.\n"); |
11cf8741 | 7733 | } |
43ff13b4 | 7734 | |
0c7e1a46 PA |
7735 | /* Print current location without a level number, if we have changed |
7736 | functions or hit a breakpoint. Print source line if we have one. | |
7737 | bpstat_print contains the logic deciding in detail what to print, | |
7738 | based on the event(s) that just occurred. */ | |
7739 | ||
243a9253 PA |
7740 | static void |
7741 | print_stop_location (struct target_waitstatus *ws) | |
0c7e1a46 PA |
7742 | { |
7743 | int bpstat_ret; | |
f486487f | 7744 | enum print_what source_flag; |
0c7e1a46 PA |
7745 | int do_frame_printing = 1; |
7746 | struct thread_info *tp = inferior_thread (); | |
7747 | ||
7748 | bpstat_ret = bpstat_print (tp->control.stop_bpstat, ws->kind); | |
7749 | switch (bpstat_ret) | |
7750 | { | |
7751 | case PRINT_UNKNOWN: | |
7752 | /* FIXME: cagney/2002-12-01: Given that a frame ID does (or | |
7753 | should) carry around the function and does (or should) use | |
7754 | that when doing a frame comparison. */ | |
7755 | if (tp->control.stop_step | |
7756 | && frame_id_eq (tp->control.step_frame_id, | |
7757 | get_frame_id (get_current_frame ())) | |
f2ffa92b PA |
7758 | && (tp->control.step_start_function |
7759 | == find_pc_function (tp->suspend.stop_pc))) | |
0c7e1a46 PA |
7760 | { |
7761 | /* Finished step, just print source line. */ | |
7762 | source_flag = SRC_LINE; | |
7763 | } | |
7764 | else | |
7765 | { | |
7766 | /* Print location and source line. */ | |
7767 | source_flag = SRC_AND_LOC; | |
7768 | } | |
7769 | break; | |
7770 | case PRINT_SRC_AND_LOC: | |
7771 | /* Print location and source line. */ | |
7772 | source_flag = SRC_AND_LOC; | |
7773 | break; | |
7774 | case PRINT_SRC_ONLY: | |
7775 | source_flag = SRC_LINE; | |
7776 | break; | |
7777 | case PRINT_NOTHING: | |
7778 | /* Something bogus. */ | |
7779 | source_flag = SRC_LINE; | |
7780 | do_frame_printing = 0; | |
7781 | break; | |
7782 | default: | |
7783 | internal_error (__FILE__, __LINE__, _("Unknown value.")); | |
7784 | } | |
7785 | ||
7786 | /* The behavior of this routine with respect to the source | |
7787 | flag is: | |
7788 | SRC_LINE: Print only source line | |
7789 | LOCATION: Print only location | |
7790 | SRC_AND_LOC: Print location and source line. */ | |
7791 | if (do_frame_printing) | |
7792 | print_stack_frame (get_selected_frame (NULL), 0, source_flag, 1); | |
243a9253 PA |
7793 | } |
7794 | ||
243a9253 PA |
7795 | /* See infrun.h. */ |
7796 | ||
7797 | void | |
4c7d57e7 | 7798 | print_stop_event (struct ui_out *uiout, bool displays) |
243a9253 | 7799 | { |
243a9253 PA |
7800 | struct target_waitstatus last; |
7801 | ptid_t last_ptid; | |
7802 | struct thread_info *tp; | |
7803 | ||
7804 | get_last_target_status (&last_ptid, &last); | |
7805 | ||
67ad9399 TT |
7806 | { |
7807 | scoped_restore save_uiout = make_scoped_restore (¤t_uiout, uiout); | |
0c7e1a46 | 7808 | |
67ad9399 | 7809 | print_stop_location (&last); |
243a9253 | 7810 | |
67ad9399 | 7811 | /* Display the auto-display expressions. */ |
4c7d57e7 TT |
7812 | if (displays) |
7813 | do_displays (); | |
67ad9399 | 7814 | } |
243a9253 PA |
7815 | |
7816 | tp = inferior_thread (); | |
7817 | if (tp->thread_fsm != NULL | |
46e3ed7f | 7818 | && tp->thread_fsm->finished_p ()) |
243a9253 PA |
7819 | { |
7820 | struct return_value_info *rv; | |
7821 | ||
46e3ed7f | 7822 | rv = tp->thread_fsm->return_value (); |
243a9253 PA |
7823 | if (rv != NULL) |
7824 | print_return_value (uiout, rv); | |
7825 | } | |
0c7e1a46 PA |
7826 | } |
7827 | ||
388a7084 PA |
7828 | /* See infrun.h. */ |
7829 | ||
7830 | void | |
7831 | maybe_remove_breakpoints (void) | |
7832 | { | |
7833 | if (!breakpoints_should_be_inserted_now () && target_has_execution) | |
7834 | { | |
7835 | if (remove_breakpoints ()) | |
7836 | { | |
223ffa71 | 7837 | target_terminal::ours_for_output (); |
388a7084 PA |
7838 | printf_filtered (_("Cannot remove breakpoints because " |
7839 | "program is no longer writable.\nFurther " | |
7840 | "execution is probably impossible.\n")); | |
7841 | } | |
7842 | } | |
7843 | } | |
7844 | ||
4c2f2a79 PA |
7845 | /* The execution context that just caused a normal stop. */ |
7846 | ||
7847 | struct stop_context | |
7848 | { | |
2d844eaf TT |
7849 | stop_context (); |
7850 | ~stop_context (); | |
7851 | ||
7852 | DISABLE_COPY_AND_ASSIGN (stop_context); | |
7853 | ||
7854 | bool changed () const; | |
7855 | ||
4c2f2a79 PA |
7856 | /* The stop ID. */ |
7857 | ULONGEST stop_id; | |
c906108c | 7858 | |
4c2f2a79 | 7859 | /* The event PTID. */ |
c906108c | 7860 | |
4c2f2a79 PA |
7861 | ptid_t ptid; |
7862 | ||
7863 | /* If stopp for a thread event, this is the thread that caused the | |
7864 | stop. */ | |
7865 | struct thread_info *thread; | |
7866 | ||
7867 | /* The inferior that caused the stop. */ | |
7868 | int inf_num; | |
7869 | }; | |
7870 | ||
2d844eaf | 7871 | /* Initializes a new stop context. If stopped for a thread event, this |
4c2f2a79 PA |
7872 | takes a strong reference to the thread. */ |
7873 | ||
2d844eaf | 7874 | stop_context::stop_context () |
4c2f2a79 | 7875 | { |
2d844eaf TT |
7876 | stop_id = get_stop_id (); |
7877 | ptid = inferior_ptid; | |
7878 | inf_num = current_inferior ()->num; | |
4c2f2a79 | 7879 | |
d7e15655 | 7880 | if (inferior_ptid != null_ptid) |
4c2f2a79 PA |
7881 | { |
7882 | /* Take a strong reference so that the thread can't be deleted | |
7883 | yet. */ | |
2d844eaf TT |
7884 | thread = inferior_thread (); |
7885 | thread->incref (); | |
4c2f2a79 PA |
7886 | } |
7887 | else | |
2d844eaf | 7888 | thread = NULL; |
4c2f2a79 PA |
7889 | } |
7890 | ||
7891 | /* Release a stop context previously created with save_stop_context. | |
7892 | Releases the strong reference to the thread as well. */ | |
7893 | ||
2d844eaf | 7894 | stop_context::~stop_context () |
4c2f2a79 | 7895 | { |
2d844eaf TT |
7896 | if (thread != NULL) |
7897 | thread->decref (); | |
4c2f2a79 PA |
7898 | } |
7899 | ||
7900 | /* Return true if the current context no longer matches the saved stop | |
7901 | context. */ | |
7902 | ||
2d844eaf TT |
7903 | bool |
7904 | stop_context::changed () const | |
7905 | { | |
7906 | if (ptid != inferior_ptid) | |
7907 | return true; | |
7908 | if (inf_num != current_inferior ()->num) | |
7909 | return true; | |
7910 | if (thread != NULL && thread->state != THREAD_STOPPED) | |
7911 | return true; | |
7912 | if (get_stop_id () != stop_id) | |
7913 | return true; | |
7914 | return false; | |
4c2f2a79 PA |
7915 | } |
7916 | ||
7917 | /* See infrun.h. */ | |
7918 | ||
7919 | int | |
96baa820 | 7920 | normal_stop (void) |
c906108c | 7921 | { |
73b65bb0 DJ |
7922 | struct target_waitstatus last; |
7923 | ptid_t last_ptid; | |
7924 | ||
7925 | get_last_target_status (&last_ptid, &last); | |
7926 | ||
4c2f2a79 PA |
7927 | new_stop_id (); |
7928 | ||
29f49a6a PA |
7929 | /* If an exception is thrown from this point on, make sure to |
7930 | propagate GDB's knowledge of the executing state to the | |
7931 | frontend/user running state. A QUIT is an easy exception to see | |
7932 | here, so do this before any filtered output. */ | |
731f534f PA |
7933 | |
7934 | gdb::optional<scoped_finish_thread_state> maybe_finish_thread_state; | |
7935 | ||
c35b1492 | 7936 | if (!non_stop) |
731f534f | 7937 | maybe_finish_thread_state.emplace (minus_one_ptid); |
e1316e60 PA |
7938 | else if (last.kind == TARGET_WAITKIND_SIGNALLED |
7939 | || last.kind == TARGET_WAITKIND_EXITED) | |
7940 | { | |
7941 | /* On some targets, we may still have live threads in the | |
7942 | inferior when we get a process exit event. E.g., for | |
7943 | "checkpoint", when the current checkpoint/fork exits, | |
7944 | linux-fork.c automatically switches to another fork from | |
7945 | within target_mourn_inferior. */ | |
731f534f PA |
7946 | if (inferior_ptid != null_ptid) |
7947 | maybe_finish_thread_state.emplace (ptid_t (inferior_ptid.pid ())); | |
e1316e60 PA |
7948 | } |
7949 | else if (last.kind != TARGET_WAITKIND_NO_RESUMED) | |
731f534f | 7950 | maybe_finish_thread_state.emplace (inferior_ptid); |
29f49a6a | 7951 | |
b57bacec PA |
7952 | /* As we're presenting a stop, and potentially removing breakpoints, |
7953 | update the thread list so we can tell whether there are threads | |
7954 | running on the target. With target remote, for example, we can | |
7955 | only learn about new threads when we explicitly update the thread | |
7956 | list. Do this before notifying the interpreters about signal | |
7957 | stops, end of stepping ranges, etc., so that the "new thread" | |
7958 | output is emitted before e.g., "Program received signal FOO", | |
7959 | instead of after. */ | |
7960 | update_thread_list (); | |
7961 | ||
7962 | if (last.kind == TARGET_WAITKIND_STOPPED && stopped_by_random_signal) | |
76727919 | 7963 | gdb::observers::signal_received.notify (inferior_thread ()->suspend.stop_signal); |
b57bacec | 7964 | |
c906108c SS |
7965 | /* As with the notification of thread events, we want to delay |
7966 | notifying the user that we've switched thread context until | |
7967 | the inferior actually stops. | |
7968 | ||
73b65bb0 DJ |
7969 | There's no point in saying anything if the inferior has exited. |
7970 | Note that SIGNALLED here means "exited with a signal", not | |
b65dc60b PA |
7971 | "received a signal". |
7972 | ||
7973 | Also skip saying anything in non-stop mode. In that mode, as we | |
7974 | don't want GDB to switch threads behind the user's back, to avoid | |
7975 | races where the user is typing a command to apply to thread x, | |
7976 | but GDB switches to thread y before the user finishes entering | |
7977 | the command, fetch_inferior_event installs a cleanup to restore | |
7978 | the current thread back to the thread the user had selected right | |
7979 | after this event is handled, so we're not really switching, only | |
7980 | informing of a stop. */ | |
4f8d22e3 | 7981 | if (!non_stop |
731f534f | 7982 | && previous_inferior_ptid != inferior_ptid |
73b65bb0 DJ |
7983 | && target_has_execution |
7984 | && last.kind != TARGET_WAITKIND_SIGNALLED | |
0e5bf2a8 PA |
7985 | && last.kind != TARGET_WAITKIND_EXITED |
7986 | && last.kind != TARGET_WAITKIND_NO_RESUMED) | |
c906108c | 7987 | { |
0e454242 | 7988 | SWITCH_THRU_ALL_UIS () |
3b12939d | 7989 | { |
223ffa71 | 7990 | target_terminal::ours_for_output (); |
3b12939d | 7991 | printf_filtered (_("[Switching to %s]\n"), |
a068643d | 7992 | target_pid_to_str (inferior_ptid).c_str ()); |
3b12939d PA |
7993 | annotate_thread_changed (); |
7994 | } | |
39f77062 | 7995 | previous_inferior_ptid = inferior_ptid; |
c906108c | 7996 | } |
c906108c | 7997 | |
0e5bf2a8 PA |
7998 | if (last.kind == TARGET_WAITKIND_NO_RESUMED) |
7999 | { | |
0e454242 | 8000 | SWITCH_THRU_ALL_UIS () |
3b12939d PA |
8001 | if (current_ui->prompt_state == PROMPT_BLOCKED) |
8002 | { | |
223ffa71 | 8003 | target_terminal::ours_for_output (); |
3b12939d PA |
8004 | printf_filtered (_("No unwaited-for children left.\n")); |
8005 | } | |
0e5bf2a8 PA |
8006 | } |
8007 | ||
b57bacec | 8008 | /* Note: this depends on the update_thread_list call above. */ |
388a7084 | 8009 | maybe_remove_breakpoints (); |
c906108c | 8010 | |
c906108c SS |
8011 | /* If an auto-display called a function and that got a signal, |
8012 | delete that auto-display to avoid an infinite recursion. */ | |
8013 | ||
8014 | if (stopped_by_random_signal) | |
8015 | disable_current_display (); | |
8016 | ||
0e454242 | 8017 | SWITCH_THRU_ALL_UIS () |
3b12939d PA |
8018 | { |
8019 | async_enable_stdin (); | |
8020 | } | |
c906108c | 8021 | |
388a7084 | 8022 | /* Let the user/frontend see the threads as stopped. */ |
731f534f | 8023 | maybe_finish_thread_state.reset (); |
388a7084 PA |
8024 | |
8025 | /* Select innermost stack frame - i.e., current frame is frame 0, | |
8026 | and current location is based on that. Handle the case where the | |
8027 | dummy call is returning after being stopped. E.g. the dummy call | |
8028 | previously hit a breakpoint. (If the dummy call returns | |
8029 | normally, we won't reach here.) Do this before the stop hook is | |
8030 | run, so that it doesn't get to see the temporary dummy frame, | |
8031 | which is not where we'll present the stop. */ | |
8032 | if (has_stack_frames ()) | |
8033 | { | |
8034 | if (stop_stack_dummy == STOP_STACK_DUMMY) | |
8035 | { | |
8036 | /* Pop the empty frame that contains the stack dummy. This | |
8037 | also restores inferior state prior to the call (struct | |
8038 | infcall_suspend_state). */ | |
8039 | struct frame_info *frame = get_current_frame (); | |
8040 | ||
8041 | gdb_assert (get_frame_type (frame) == DUMMY_FRAME); | |
8042 | frame_pop (frame); | |
8043 | /* frame_pop calls reinit_frame_cache as the last thing it | |
8044 | does which means there's now no selected frame. */ | |
8045 | } | |
8046 | ||
8047 | select_frame (get_current_frame ()); | |
8048 | ||
8049 | /* Set the current source location. */ | |
8050 | set_current_sal_from_frame (get_current_frame ()); | |
8051 | } | |
dd7e2d2b PA |
8052 | |
8053 | /* Look up the hook_stop and run it (CLI internally handles problem | |
8054 | of stop_command's pre-hook not existing). */ | |
4c2f2a79 PA |
8055 | if (stop_command != NULL) |
8056 | { | |
2d844eaf | 8057 | stop_context saved_context; |
4c2f2a79 | 8058 | |
a70b8144 | 8059 | try |
bf469271 PA |
8060 | { |
8061 | execute_cmd_pre_hook (stop_command); | |
8062 | } | |
230d2906 | 8063 | catch (const gdb_exception &ex) |
bf469271 PA |
8064 | { |
8065 | exception_fprintf (gdb_stderr, ex, | |
8066 | "Error while running hook_stop:\n"); | |
8067 | } | |
4c2f2a79 PA |
8068 | |
8069 | /* If the stop hook resumes the target, then there's no point in | |
8070 | trying to notify about the previous stop; its context is | |
8071 | gone. Likewise if the command switches thread or inferior -- | |
8072 | the observers would print a stop for the wrong | |
8073 | thread/inferior. */ | |
2d844eaf TT |
8074 | if (saved_context.changed ()) |
8075 | return 1; | |
4c2f2a79 | 8076 | } |
dd7e2d2b | 8077 | |
388a7084 PA |
8078 | /* Notify observers about the stop. This is where the interpreters |
8079 | print the stop event. */ | |
d7e15655 | 8080 | if (inferior_ptid != null_ptid) |
76727919 | 8081 | gdb::observers::normal_stop.notify (inferior_thread ()->control.stop_bpstat, |
388a7084 PA |
8082 | stop_print_frame); |
8083 | else | |
76727919 | 8084 | gdb::observers::normal_stop.notify (NULL, stop_print_frame); |
347bddb7 | 8085 | |
243a9253 PA |
8086 | annotate_stopped (); |
8087 | ||
48844aa6 PA |
8088 | if (target_has_execution) |
8089 | { | |
8090 | if (last.kind != TARGET_WAITKIND_SIGNALLED | |
fe726667 PA |
8091 | && last.kind != TARGET_WAITKIND_EXITED |
8092 | && last.kind != TARGET_WAITKIND_NO_RESUMED) | |
48844aa6 PA |
8093 | /* Delete the breakpoint we stopped at, if it wants to be deleted. |
8094 | Delete any breakpoint that is to be deleted at the next stop. */ | |
16c381f0 | 8095 | breakpoint_auto_delete (inferior_thread ()->control.stop_bpstat); |
94cc34af | 8096 | } |
6c95b8df PA |
8097 | |
8098 | /* Try to get rid of automatically added inferiors that are no | |
8099 | longer needed. Keeping those around slows down things linearly. | |
8100 | Note that this never removes the current inferior. */ | |
8101 | prune_inferiors (); | |
4c2f2a79 PA |
8102 | |
8103 | return 0; | |
c906108c | 8104 | } |
c906108c | 8105 | \f |
c5aa993b | 8106 | int |
96baa820 | 8107 | signal_stop_state (int signo) |
c906108c | 8108 | { |
d6b48e9c | 8109 | return signal_stop[signo]; |
c906108c SS |
8110 | } |
8111 | ||
c5aa993b | 8112 | int |
96baa820 | 8113 | signal_print_state (int signo) |
c906108c SS |
8114 | { |
8115 | return signal_print[signo]; | |
8116 | } | |
8117 | ||
c5aa993b | 8118 | int |
96baa820 | 8119 | signal_pass_state (int signo) |
c906108c SS |
8120 | { |
8121 | return signal_program[signo]; | |
8122 | } | |
8123 | ||
2455069d UW |
8124 | static void |
8125 | signal_cache_update (int signo) | |
8126 | { | |
8127 | if (signo == -1) | |
8128 | { | |
a493e3e2 | 8129 | for (signo = 0; signo < (int) GDB_SIGNAL_LAST; signo++) |
2455069d UW |
8130 | signal_cache_update (signo); |
8131 | ||
8132 | return; | |
8133 | } | |
8134 | ||
8135 | signal_pass[signo] = (signal_stop[signo] == 0 | |
8136 | && signal_print[signo] == 0 | |
ab04a2af TT |
8137 | && signal_program[signo] == 1 |
8138 | && signal_catch[signo] == 0); | |
2455069d UW |
8139 | } |
8140 | ||
488f131b | 8141 | int |
7bda5e4a | 8142 | signal_stop_update (int signo, int state) |
d4f3574e SS |
8143 | { |
8144 | int ret = signal_stop[signo]; | |
abbb1732 | 8145 | |
d4f3574e | 8146 | signal_stop[signo] = state; |
2455069d | 8147 | signal_cache_update (signo); |
d4f3574e SS |
8148 | return ret; |
8149 | } | |
8150 | ||
488f131b | 8151 | int |
7bda5e4a | 8152 | signal_print_update (int signo, int state) |
d4f3574e SS |
8153 | { |
8154 | int ret = signal_print[signo]; | |
abbb1732 | 8155 | |
d4f3574e | 8156 | signal_print[signo] = state; |
2455069d | 8157 | signal_cache_update (signo); |
d4f3574e SS |
8158 | return ret; |
8159 | } | |
8160 | ||
488f131b | 8161 | int |
7bda5e4a | 8162 | signal_pass_update (int signo, int state) |
d4f3574e SS |
8163 | { |
8164 | int ret = signal_program[signo]; | |
abbb1732 | 8165 | |
d4f3574e | 8166 | signal_program[signo] = state; |
2455069d | 8167 | signal_cache_update (signo); |
d4f3574e SS |
8168 | return ret; |
8169 | } | |
8170 | ||
ab04a2af TT |
8171 | /* Update the global 'signal_catch' from INFO and notify the |
8172 | target. */ | |
8173 | ||
8174 | void | |
8175 | signal_catch_update (const unsigned int *info) | |
8176 | { | |
8177 | int i; | |
8178 | ||
8179 | for (i = 0; i < GDB_SIGNAL_LAST; ++i) | |
8180 | signal_catch[i] = info[i] > 0; | |
8181 | signal_cache_update (-1); | |
adc6a863 | 8182 | target_pass_signals (signal_pass); |
ab04a2af TT |
8183 | } |
8184 | ||
c906108c | 8185 | static void |
96baa820 | 8186 | sig_print_header (void) |
c906108c | 8187 | { |
3e43a32a MS |
8188 | printf_filtered (_("Signal Stop\tPrint\tPass " |
8189 | "to program\tDescription\n")); | |
c906108c SS |
8190 | } |
8191 | ||
8192 | static void | |
2ea28649 | 8193 | sig_print_info (enum gdb_signal oursig) |
c906108c | 8194 | { |
2ea28649 | 8195 | const char *name = gdb_signal_to_name (oursig); |
c906108c | 8196 | int name_padding = 13 - strlen (name); |
96baa820 | 8197 | |
c906108c SS |
8198 | if (name_padding <= 0) |
8199 | name_padding = 0; | |
8200 | ||
8201 | printf_filtered ("%s", name); | |
488f131b | 8202 | printf_filtered ("%*.*s ", name_padding, name_padding, " "); |
c906108c SS |
8203 | printf_filtered ("%s\t", signal_stop[oursig] ? "Yes" : "No"); |
8204 | printf_filtered ("%s\t", signal_print[oursig] ? "Yes" : "No"); | |
8205 | printf_filtered ("%s\t\t", signal_program[oursig] ? "Yes" : "No"); | |
2ea28649 | 8206 | printf_filtered ("%s\n", gdb_signal_to_string (oursig)); |
c906108c SS |
8207 | } |
8208 | ||
8209 | /* Specify how various signals in the inferior should be handled. */ | |
8210 | ||
8211 | static void | |
0b39b52e | 8212 | handle_command (const char *args, int from_tty) |
c906108c | 8213 | { |
c906108c | 8214 | int digits, wordlen; |
b926417a | 8215 | int sigfirst, siglast; |
2ea28649 | 8216 | enum gdb_signal oursig; |
c906108c | 8217 | int allsigs; |
c906108c SS |
8218 | |
8219 | if (args == NULL) | |
8220 | { | |
e2e0b3e5 | 8221 | error_no_arg (_("signal to handle")); |
c906108c SS |
8222 | } |
8223 | ||
1777feb0 | 8224 | /* Allocate and zero an array of flags for which signals to handle. */ |
c906108c | 8225 | |
adc6a863 PA |
8226 | const size_t nsigs = GDB_SIGNAL_LAST; |
8227 | unsigned char sigs[nsigs] {}; | |
c906108c | 8228 | |
1777feb0 | 8229 | /* Break the command line up into args. */ |
c906108c | 8230 | |
773a1edc | 8231 | gdb_argv built_argv (args); |
c906108c SS |
8232 | |
8233 | /* Walk through the args, looking for signal oursigs, signal names, and | |
8234 | actions. Signal numbers and signal names may be interspersed with | |
8235 | actions, with the actions being performed for all signals cumulatively | |
1777feb0 | 8236 | specified. Signal ranges can be specified as <LOW>-<HIGH>. */ |
c906108c | 8237 | |
773a1edc | 8238 | for (char *arg : built_argv) |
c906108c | 8239 | { |
773a1edc TT |
8240 | wordlen = strlen (arg); |
8241 | for (digits = 0; isdigit (arg[digits]); digits++) | |
c906108c SS |
8242 | {; |
8243 | } | |
8244 | allsigs = 0; | |
8245 | sigfirst = siglast = -1; | |
8246 | ||
773a1edc | 8247 | if (wordlen >= 1 && !strncmp (arg, "all", wordlen)) |
c906108c SS |
8248 | { |
8249 | /* Apply action to all signals except those used by the | |
1777feb0 | 8250 | debugger. Silently skip those. */ |
c906108c SS |
8251 | allsigs = 1; |
8252 | sigfirst = 0; | |
8253 | siglast = nsigs - 1; | |
8254 | } | |
773a1edc | 8255 | else if (wordlen >= 1 && !strncmp (arg, "stop", wordlen)) |
c906108c SS |
8256 | { |
8257 | SET_SIGS (nsigs, sigs, signal_stop); | |
8258 | SET_SIGS (nsigs, sigs, signal_print); | |
8259 | } | |
773a1edc | 8260 | else if (wordlen >= 1 && !strncmp (arg, "ignore", wordlen)) |
c906108c SS |
8261 | { |
8262 | UNSET_SIGS (nsigs, sigs, signal_program); | |
8263 | } | |
773a1edc | 8264 | else if (wordlen >= 2 && !strncmp (arg, "print", wordlen)) |
c906108c SS |
8265 | { |
8266 | SET_SIGS (nsigs, sigs, signal_print); | |
8267 | } | |
773a1edc | 8268 | else if (wordlen >= 2 && !strncmp (arg, "pass", wordlen)) |
c906108c SS |
8269 | { |
8270 | SET_SIGS (nsigs, sigs, signal_program); | |
8271 | } | |
773a1edc | 8272 | else if (wordlen >= 3 && !strncmp (arg, "nostop", wordlen)) |
c906108c SS |
8273 | { |
8274 | UNSET_SIGS (nsigs, sigs, signal_stop); | |
8275 | } | |
773a1edc | 8276 | else if (wordlen >= 3 && !strncmp (arg, "noignore", wordlen)) |
c906108c SS |
8277 | { |
8278 | SET_SIGS (nsigs, sigs, signal_program); | |
8279 | } | |
773a1edc | 8280 | else if (wordlen >= 4 && !strncmp (arg, "noprint", wordlen)) |
c906108c SS |
8281 | { |
8282 | UNSET_SIGS (nsigs, sigs, signal_print); | |
8283 | UNSET_SIGS (nsigs, sigs, signal_stop); | |
8284 | } | |
773a1edc | 8285 | else if (wordlen >= 4 && !strncmp (arg, "nopass", wordlen)) |
c906108c SS |
8286 | { |
8287 | UNSET_SIGS (nsigs, sigs, signal_program); | |
8288 | } | |
8289 | else if (digits > 0) | |
8290 | { | |
8291 | /* It is numeric. The numeric signal refers to our own | |
8292 | internal signal numbering from target.h, not to host/target | |
8293 | signal number. This is a feature; users really should be | |
8294 | using symbolic names anyway, and the common ones like | |
8295 | SIGHUP, SIGINT, SIGALRM, etc. will work right anyway. */ | |
8296 | ||
8297 | sigfirst = siglast = (int) | |
773a1edc TT |
8298 | gdb_signal_from_command (atoi (arg)); |
8299 | if (arg[digits] == '-') | |
c906108c SS |
8300 | { |
8301 | siglast = (int) | |
773a1edc | 8302 | gdb_signal_from_command (atoi (arg + digits + 1)); |
c906108c SS |
8303 | } |
8304 | if (sigfirst > siglast) | |
8305 | { | |
1777feb0 | 8306 | /* Bet he didn't figure we'd think of this case... */ |
b926417a | 8307 | std::swap (sigfirst, siglast); |
c906108c SS |
8308 | } |
8309 | } | |
8310 | else | |
8311 | { | |
773a1edc | 8312 | oursig = gdb_signal_from_name (arg); |
a493e3e2 | 8313 | if (oursig != GDB_SIGNAL_UNKNOWN) |
c906108c SS |
8314 | { |
8315 | sigfirst = siglast = (int) oursig; | |
8316 | } | |
8317 | else | |
8318 | { | |
8319 | /* Not a number and not a recognized flag word => complain. */ | |
773a1edc | 8320 | error (_("Unrecognized or ambiguous flag word: \"%s\"."), arg); |
c906108c SS |
8321 | } |
8322 | } | |
8323 | ||
8324 | /* If any signal numbers or symbol names were found, set flags for | |
1777feb0 | 8325 | which signals to apply actions to. */ |
c906108c | 8326 | |
b926417a | 8327 | for (int signum = sigfirst; signum >= 0 && signum <= siglast; signum++) |
c906108c | 8328 | { |
2ea28649 | 8329 | switch ((enum gdb_signal) signum) |
c906108c | 8330 | { |
a493e3e2 PA |
8331 | case GDB_SIGNAL_TRAP: |
8332 | case GDB_SIGNAL_INT: | |
c906108c SS |
8333 | if (!allsigs && !sigs[signum]) |
8334 | { | |
9e2f0ad4 | 8335 | if (query (_("%s is used by the debugger.\n\ |
3e43a32a | 8336 | Are you sure you want to change it? "), |
2ea28649 | 8337 | gdb_signal_to_name ((enum gdb_signal) signum))) |
c906108c SS |
8338 | { |
8339 | sigs[signum] = 1; | |
8340 | } | |
8341 | else | |
c119e040 | 8342 | printf_unfiltered (_("Not confirmed, unchanged.\n")); |
c906108c SS |
8343 | } |
8344 | break; | |
a493e3e2 PA |
8345 | case GDB_SIGNAL_0: |
8346 | case GDB_SIGNAL_DEFAULT: | |
8347 | case GDB_SIGNAL_UNKNOWN: | |
c906108c SS |
8348 | /* Make sure that "all" doesn't print these. */ |
8349 | break; | |
8350 | default: | |
8351 | sigs[signum] = 1; | |
8352 | break; | |
8353 | } | |
8354 | } | |
c906108c SS |
8355 | } |
8356 | ||
b926417a | 8357 | for (int signum = 0; signum < nsigs; signum++) |
3a031f65 PA |
8358 | if (sigs[signum]) |
8359 | { | |
2455069d | 8360 | signal_cache_update (-1); |
adc6a863 PA |
8361 | target_pass_signals (signal_pass); |
8362 | target_program_signals (signal_program); | |
c906108c | 8363 | |
3a031f65 PA |
8364 | if (from_tty) |
8365 | { | |
8366 | /* Show the results. */ | |
8367 | sig_print_header (); | |
8368 | for (; signum < nsigs; signum++) | |
8369 | if (sigs[signum]) | |
aead7601 | 8370 | sig_print_info ((enum gdb_signal) signum); |
3a031f65 PA |
8371 | } |
8372 | ||
8373 | break; | |
8374 | } | |
c906108c SS |
8375 | } |
8376 | ||
de0bea00 MF |
8377 | /* Complete the "handle" command. */ |
8378 | ||
eb3ff9a5 | 8379 | static void |
de0bea00 | 8380 | handle_completer (struct cmd_list_element *ignore, |
eb3ff9a5 | 8381 | completion_tracker &tracker, |
6f937416 | 8382 | const char *text, const char *word) |
de0bea00 | 8383 | { |
de0bea00 MF |
8384 | static const char * const keywords[] = |
8385 | { | |
8386 | "all", | |
8387 | "stop", | |
8388 | "ignore", | |
8389 | "print", | |
8390 | "pass", | |
8391 | "nostop", | |
8392 | "noignore", | |
8393 | "noprint", | |
8394 | "nopass", | |
8395 | NULL, | |
8396 | }; | |
8397 | ||
eb3ff9a5 PA |
8398 | signal_completer (ignore, tracker, text, word); |
8399 | complete_on_enum (tracker, keywords, word, word); | |
de0bea00 MF |
8400 | } |
8401 | ||
2ea28649 PA |
8402 | enum gdb_signal |
8403 | gdb_signal_from_command (int num) | |
ed01b82c PA |
8404 | { |
8405 | if (num >= 1 && num <= 15) | |
2ea28649 | 8406 | return (enum gdb_signal) num; |
ed01b82c PA |
8407 | error (_("Only signals 1-15 are valid as numeric signals.\n\ |
8408 | Use \"info signals\" for a list of symbolic signals.")); | |
8409 | } | |
8410 | ||
c906108c SS |
8411 | /* Print current contents of the tables set by the handle command. |
8412 | It is possible we should just be printing signals actually used | |
8413 | by the current target (but for things to work right when switching | |
8414 | targets, all signals should be in the signal tables). */ | |
8415 | ||
8416 | static void | |
1d12d88f | 8417 | info_signals_command (const char *signum_exp, int from_tty) |
c906108c | 8418 | { |
2ea28649 | 8419 | enum gdb_signal oursig; |
abbb1732 | 8420 | |
c906108c SS |
8421 | sig_print_header (); |
8422 | ||
8423 | if (signum_exp) | |
8424 | { | |
8425 | /* First see if this is a symbol name. */ | |
2ea28649 | 8426 | oursig = gdb_signal_from_name (signum_exp); |
a493e3e2 | 8427 | if (oursig == GDB_SIGNAL_UNKNOWN) |
c906108c SS |
8428 | { |
8429 | /* No, try numeric. */ | |
8430 | oursig = | |
2ea28649 | 8431 | gdb_signal_from_command (parse_and_eval_long (signum_exp)); |
c906108c SS |
8432 | } |
8433 | sig_print_info (oursig); | |
8434 | return; | |
8435 | } | |
8436 | ||
8437 | printf_filtered ("\n"); | |
8438 | /* These ugly casts brought to you by the native VAX compiler. */ | |
a493e3e2 PA |
8439 | for (oursig = GDB_SIGNAL_FIRST; |
8440 | (int) oursig < (int) GDB_SIGNAL_LAST; | |
2ea28649 | 8441 | oursig = (enum gdb_signal) ((int) oursig + 1)) |
c906108c SS |
8442 | { |
8443 | QUIT; | |
8444 | ||
a493e3e2 PA |
8445 | if (oursig != GDB_SIGNAL_UNKNOWN |
8446 | && oursig != GDB_SIGNAL_DEFAULT && oursig != GDB_SIGNAL_0) | |
c906108c SS |
8447 | sig_print_info (oursig); |
8448 | } | |
8449 | ||
3e43a32a MS |
8450 | printf_filtered (_("\nUse the \"handle\" command " |
8451 | "to change these tables.\n")); | |
c906108c | 8452 | } |
4aa995e1 PA |
8453 | |
8454 | /* The $_siginfo convenience variable is a bit special. We don't know | |
8455 | for sure the type of the value until we actually have a chance to | |
7a9dd1b2 | 8456 | fetch the data. The type can change depending on gdbarch, so it is |
4aa995e1 PA |
8457 | also dependent on which thread you have selected. |
8458 | ||
8459 | 1. making $_siginfo be an internalvar that creates a new value on | |
8460 | access. | |
8461 | ||
8462 | 2. making the value of $_siginfo be an lval_computed value. */ | |
8463 | ||
8464 | /* This function implements the lval_computed support for reading a | |
8465 | $_siginfo value. */ | |
8466 | ||
8467 | static void | |
8468 | siginfo_value_read (struct value *v) | |
8469 | { | |
8470 | LONGEST transferred; | |
8471 | ||
a911d87a PA |
8472 | /* If we can access registers, so can we access $_siginfo. Likewise |
8473 | vice versa. */ | |
8474 | validate_registers_access (); | |
c709acd1 | 8475 | |
4aa995e1 | 8476 | transferred = |
8b88a78e | 8477 | target_read (current_top_target (), TARGET_OBJECT_SIGNAL_INFO, |
4aa995e1 PA |
8478 | NULL, |
8479 | value_contents_all_raw (v), | |
8480 | value_offset (v), | |
8481 | TYPE_LENGTH (value_type (v))); | |
8482 | ||
8483 | if (transferred != TYPE_LENGTH (value_type (v))) | |
8484 | error (_("Unable to read siginfo")); | |
8485 | } | |
8486 | ||
8487 | /* This function implements the lval_computed support for writing a | |
8488 | $_siginfo value. */ | |
8489 | ||
8490 | static void | |
8491 | siginfo_value_write (struct value *v, struct value *fromval) | |
8492 | { | |
8493 | LONGEST transferred; | |
8494 | ||
a911d87a PA |
8495 | /* If we can access registers, so can we access $_siginfo. Likewise |
8496 | vice versa. */ | |
8497 | validate_registers_access (); | |
c709acd1 | 8498 | |
8b88a78e | 8499 | transferred = target_write (current_top_target (), |
4aa995e1 PA |
8500 | TARGET_OBJECT_SIGNAL_INFO, |
8501 | NULL, | |
8502 | value_contents_all_raw (fromval), | |
8503 | value_offset (v), | |
8504 | TYPE_LENGTH (value_type (fromval))); | |
8505 | ||
8506 | if (transferred != TYPE_LENGTH (value_type (fromval))) | |
8507 | error (_("Unable to write siginfo")); | |
8508 | } | |
8509 | ||
c8f2448a | 8510 | static const struct lval_funcs siginfo_value_funcs = |
4aa995e1 PA |
8511 | { |
8512 | siginfo_value_read, | |
8513 | siginfo_value_write | |
8514 | }; | |
8515 | ||
8516 | /* Return a new value with the correct type for the siginfo object of | |
78267919 UW |
8517 | the current thread using architecture GDBARCH. Return a void value |
8518 | if there's no object available. */ | |
4aa995e1 | 8519 | |
2c0b251b | 8520 | static struct value * |
22d2b532 SDJ |
8521 | siginfo_make_value (struct gdbarch *gdbarch, struct internalvar *var, |
8522 | void *ignore) | |
4aa995e1 | 8523 | { |
4aa995e1 | 8524 | if (target_has_stack |
d7e15655 | 8525 | && inferior_ptid != null_ptid |
78267919 | 8526 | && gdbarch_get_siginfo_type_p (gdbarch)) |
4aa995e1 | 8527 | { |
78267919 | 8528 | struct type *type = gdbarch_get_siginfo_type (gdbarch); |
abbb1732 | 8529 | |
78267919 | 8530 | return allocate_computed_value (type, &siginfo_value_funcs, NULL); |
4aa995e1 PA |
8531 | } |
8532 | ||
78267919 | 8533 | return allocate_value (builtin_type (gdbarch)->builtin_void); |
4aa995e1 PA |
8534 | } |
8535 | ||
c906108c | 8536 | \f |
16c381f0 JK |
8537 | /* infcall_suspend_state contains state about the program itself like its |
8538 | registers and any signal it received when it last stopped. | |
8539 | This state must be restored regardless of how the inferior function call | |
8540 | ends (either successfully, or after it hits a breakpoint or signal) | |
8541 | if the program is to properly continue where it left off. */ | |
8542 | ||
6bf78e29 | 8543 | class infcall_suspend_state |
7a292a7a | 8544 | { |
6bf78e29 AB |
8545 | public: |
8546 | /* Capture state from GDBARCH, TP, and REGCACHE that must be restored | |
8547 | once the inferior function call has finished. */ | |
8548 | infcall_suspend_state (struct gdbarch *gdbarch, | |
8549 | const struct thread_info *tp, | |
8550 | struct regcache *regcache) | |
8551 | : m_thread_suspend (tp->suspend), | |
8552 | m_registers (new readonly_detached_regcache (*regcache)) | |
8553 | { | |
8554 | gdb::unique_xmalloc_ptr<gdb_byte> siginfo_data; | |
8555 | ||
8556 | if (gdbarch_get_siginfo_type_p (gdbarch)) | |
8557 | { | |
8558 | struct type *type = gdbarch_get_siginfo_type (gdbarch); | |
8559 | size_t len = TYPE_LENGTH (type); | |
8560 | ||
8561 | siginfo_data.reset ((gdb_byte *) xmalloc (len)); | |
8562 | ||
8563 | if (target_read (current_top_target (), TARGET_OBJECT_SIGNAL_INFO, NULL, | |
8564 | siginfo_data.get (), 0, len) != len) | |
8565 | { | |
8566 | /* Errors ignored. */ | |
8567 | siginfo_data.reset (nullptr); | |
8568 | } | |
8569 | } | |
8570 | ||
8571 | if (siginfo_data) | |
8572 | { | |
8573 | m_siginfo_gdbarch = gdbarch; | |
8574 | m_siginfo_data = std::move (siginfo_data); | |
8575 | } | |
8576 | } | |
8577 | ||
8578 | /* Return a pointer to the stored register state. */ | |
16c381f0 | 8579 | |
6bf78e29 AB |
8580 | readonly_detached_regcache *registers () const |
8581 | { | |
8582 | return m_registers.get (); | |
8583 | } | |
8584 | ||
8585 | /* Restores the stored state into GDBARCH, TP, and REGCACHE. */ | |
8586 | ||
8587 | void restore (struct gdbarch *gdbarch, | |
8588 | struct thread_info *tp, | |
8589 | struct regcache *regcache) const | |
8590 | { | |
8591 | tp->suspend = m_thread_suspend; | |
8592 | ||
8593 | if (m_siginfo_gdbarch == gdbarch) | |
8594 | { | |
8595 | struct type *type = gdbarch_get_siginfo_type (gdbarch); | |
8596 | ||
8597 | /* Errors ignored. */ | |
8598 | target_write (current_top_target (), TARGET_OBJECT_SIGNAL_INFO, NULL, | |
8599 | m_siginfo_data.get (), 0, TYPE_LENGTH (type)); | |
8600 | } | |
8601 | ||
8602 | /* The inferior can be gone if the user types "print exit(0)" | |
8603 | (and perhaps other times). */ | |
8604 | if (target_has_execution) | |
8605 | /* NB: The register write goes through to the target. */ | |
8606 | regcache->restore (registers ()); | |
8607 | } | |
8608 | ||
8609 | private: | |
8610 | /* How the current thread stopped before the inferior function call was | |
8611 | executed. */ | |
8612 | struct thread_suspend_state m_thread_suspend; | |
8613 | ||
8614 | /* The registers before the inferior function call was executed. */ | |
8615 | std::unique_ptr<readonly_detached_regcache> m_registers; | |
1736ad11 | 8616 | |
35515841 | 8617 | /* Format of SIGINFO_DATA or NULL if it is not present. */ |
6bf78e29 | 8618 | struct gdbarch *m_siginfo_gdbarch = nullptr; |
1736ad11 JK |
8619 | |
8620 | /* The inferior format depends on SIGINFO_GDBARCH and it has a length of | |
8621 | TYPE_LENGTH (gdbarch_get_siginfo_type ()). For different gdbarch the | |
8622 | content would be invalid. */ | |
6bf78e29 | 8623 | gdb::unique_xmalloc_ptr<gdb_byte> m_siginfo_data; |
b89667eb DE |
8624 | }; |
8625 | ||
cb524840 TT |
8626 | infcall_suspend_state_up |
8627 | save_infcall_suspend_state () | |
b89667eb | 8628 | { |
b89667eb | 8629 | struct thread_info *tp = inferior_thread (); |
1736ad11 | 8630 | struct regcache *regcache = get_current_regcache (); |
ac7936df | 8631 | struct gdbarch *gdbarch = regcache->arch (); |
1736ad11 | 8632 | |
6bf78e29 AB |
8633 | infcall_suspend_state_up inf_state |
8634 | (new struct infcall_suspend_state (gdbarch, tp, regcache)); | |
1736ad11 | 8635 | |
6bf78e29 AB |
8636 | /* Having saved the current state, adjust the thread state, discarding |
8637 | any stop signal information. The stop signal is not useful when | |
8638 | starting an inferior function call, and run_inferior_call will not use | |
8639 | the signal due to its `proceed' call with GDB_SIGNAL_0. */ | |
a493e3e2 | 8640 | tp->suspend.stop_signal = GDB_SIGNAL_0; |
35515841 | 8641 | |
b89667eb DE |
8642 | return inf_state; |
8643 | } | |
8644 | ||
8645 | /* Restore inferior session state to INF_STATE. */ | |
8646 | ||
8647 | void | |
16c381f0 | 8648 | restore_infcall_suspend_state (struct infcall_suspend_state *inf_state) |
b89667eb DE |
8649 | { |
8650 | struct thread_info *tp = inferior_thread (); | |
1736ad11 | 8651 | struct regcache *regcache = get_current_regcache (); |
ac7936df | 8652 | struct gdbarch *gdbarch = regcache->arch (); |
b89667eb | 8653 | |
6bf78e29 | 8654 | inf_state->restore (gdbarch, tp, regcache); |
16c381f0 | 8655 | discard_infcall_suspend_state (inf_state); |
b89667eb DE |
8656 | } |
8657 | ||
b89667eb | 8658 | void |
16c381f0 | 8659 | discard_infcall_suspend_state (struct infcall_suspend_state *inf_state) |
b89667eb | 8660 | { |
dd848631 | 8661 | delete inf_state; |
b89667eb DE |
8662 | } |
8663 | ||
daf6667d | 8664 | readonly_detached_regcache * |
16c381f0 | 8665 | get_infcall_suspend_state_regcache (struct infcall_suspend_state *inf_state) |
b89667eb | 8666 | { |
6bf78e29 | 8667 | return inf_state->registers (); |
b89667eb DE |
8668 | } |
8669 | ||
16c381f0 JK |
8670 | /* infcall_control_state contains state regarding gdb's control of the |
8671 | inferior itself like stepping control. It also contains session state like | |
8672 | the user's currently selected frame. */ | |
b89667eb | 8673 | |
16c381f0 | 8674 | struct infcall_control_state |
b89667eb | 8675 | { |
16c381f0 JK |
8676 | struct thread_control_state thread_control; |
8677 | struct inferior_control_state inferior_control; | |
d82142e2 JK |
8678 | |
8679 | /* Other fields: */ | |
ee841dd8 TT |
8680 | enum stop_stack_kind stop_stack_dummy = STOP_NONE; |
8681 | int stopped_by_random_signal = 0; | |
7a292a7a | 8682 | |
b89667eb | 8683 | /* ID if the selected frame when the inferior function call was made. */ |
ee841dd8 | 8684 | struct frame_id selected_frame_id {}; |
7a292a7a SS |
8685 | }; |
8686 | ||
c906108c | 8687 | /* Save all of the information associated with the inferior<==>gdb |
b89667eb | 8688 | connection. */ |
c906108c | 8689 | |
cb524840 TT |
8690 | infcall_control_state_up |
8691 | save_infcall_control_state () | |
c906108c | 8692 | { |
cb524840 | 8693 | infcall_control_state_up inf_status (new struct infcall_control_state); |
4e1c45ea | 8694 | struct thread_info *tp = inferior_thread (); |
d6b48e9c | 8695 | struct inferior *inf = current_inferior (); |
7a292a7a | 8696 | |
16c381f0 JK |
8697 | inf_status->thread_control = tp->control; |
8698 | inf_status->inferior_control = inf->control; | |
d82142e2 | 8699 | |
8358c15c | 8700 | tp->control.step_resume_breakpoint = NULL; |
5b79abe7 | 8701 | tp->control.exception_resume_breakpoint = NULL; |
8358c15c | 8702 | |
16c381f0 JK |
8703 | /* Save original bpstat chain to INF_STATUS; replace it in TP with copy of |
8704 | chain. If caller's caller is walking the chain, they'll be happier if we | |
8705 | hand them back the original chain when restore_infcall_control_state is | |
8706 | called. */ | |
8707 | tp->control.stop_bpstat = bpstat_copy (tp->control.stop_bpstat); | |
d82142e2 JK |
8708 | |
8709 | /* Other fields: */ | |
8710 | inf_status->stop_stack_dummy = stop_stack_dummy; | |
8711 | inf_status->stopped_by_random_signal = stopped_by_random_signal; | |
c5aa993b | 8712 | |
206415a3 | 8713 | inf_status->selected_frame_id = get_frame_id (get_selected_frame (NULL)); |
b89667eb | 8714 | |
7a292a7a | 8715 | return inf_status; |
c906108c SS |
8716 | } |
8717 | ||
bf469271 PA |
8718 | static void |
8719 | restore_selected_frame (const frame_id &fid) | |
c906108c | 8720 | { |
bf469271 | 8721 | frame_info *frame = frame_find_by_id (fid); |
c906108c | 8722 | |
aa0cd9c1 AC |
8723 | /* If inf_status->selected_frame_id is NULL, there was no previously |
8724 | selected frame. */ | |
101dcfbe | 8725 | if (frame == NULL) |
c906108c | 8726 | { |
8a3fe4f8 | 8727 | warning (_("Unable to restore previously selected frame.")); |
bf469271 | 8728 | return; |
c906108c SS |
8729 | } |
8730 | ||
0f7d239c | 8731 | select_frame (frame); |
c906108c SS |
8732 | } |
8733 | ||
b89667eb DE |
8734 | /* Restore inferior session state to INF_STATUS. */ |
8735 | ||
c906108c | 8736 | void |
16c381f0 | 8737 | restore_infcall_control_state (struct infcall_control_state *inf_status) |
c906108c | 8738 | { |
4e1c45ea | 8739 | struct thread_info *tp = inferior_thread (); |
d6b48e9c | 8740 | struct inferior *inf = current_inferior (); |
4e1c45ea | 8741 | |
8358c15c JK |
8742 | if (tp->control.step_resume_breakpoint) |
8743 | tp->control.step_resume_breakpoint->disposition = disp_del_at_next_stop; | |
8744 | ||
5b79abe7 TT |
8745 | if (tp->control.exception_resume_breakpoint) |
8746 | tp->control.exception_resume_breakpoint->disposition | |
8747 | = disp_del_at_next_stop; | |
8748 | ||
d82142e2 | 8749 | /* Handle the bpstat_copy of the chain. */ |
16c381f0 | 8750 | bpstat_clear (&tp->control.stop_bpstat); |
d82142e2 | 8751 | |
16c381f0 JK |
8752 | tp->control = inf_status->thread_control; |
8753 | inf->control = inf_status->inferior_control; | |
d82142e2 JK |
8754 | |
8755 | /* Other fields: */ | |
8756 | stop_stack_dummy = inf_status->stop_stack_dummy; | |
8757 | stopped_by_random_signal = inf_status->stopped_by_random_signal; | |
c906108c | 8758 | |
b89667eb | 8759 | if (target_has_stack) |
c906108c | 8760 | { |
bf469271 | 8761 | /* The point of the try/catch is that if the stack is clobbered, |
101dcfbe AC |
8762 | walking the stack might encounter a garbage pointer and |
8763 | error() trying to dereference it. */ | |
a70b8144 | 8764 | try |
bf469271 PA |
8765 | { |
8766 | restore_selected_frame (inf_status->selected_frame_id); | |
8767 | } | |
230d2906 | 8768 | catch (const gdb_exception_error &ex) |
bf469271 PA |
8769 | { |
8770 | exception_fprintf (gdb_stderr, ex, | |
8771 | "Unable to restore previously selected frame:\n"); | |
8772 | /* Error in restoring the selected frame. Select the | |
8773 | innermost frame. */ | |
8774 | select_frame (get_current_frame ()); | |
8775 | } | |
c906108c | 8776 | } |
c906108c | 8777 | |
ee841dd8 | 8778 | delete inf_status; |
7a292a7a | 8779 | } |
c906108c SS |
8780 | |
8781 | void | |
16c381f0 | 8782 | discard_infcall_control_state (struct infcall_control_state *inf_status) |
7a292a7a | 8783 | { |
8358c15c JK |
8784 | if (inf_status->thread_control.step_resume_breakpoint) |
8785 | inf_status->thread_control.step_resume_breakpoint->disposition | |
8786 | = disp_del_at_next_stop; | |
8787 | ||
5b79abe7 TT |
8788 | if (inf_status->thread_control.exception_resume_breakpoint) |
8789 | inf_status->thread_control.exception_resume_breakpoint->disposition | |
8790 | = disp_del_at_next_stop; | |
8791 | ||
1777feb0 | 8792 | /* See save_infcall_control_state for info on stop_bpstat. */ |
16c381f0 | 8793 | bpstat_clear (&inf_status->thread_control.stop_bpstat); |
8358c15c | 8794 | |
ee841dd8 | 8795 | delete inf_status; |
7a292a7a | 8796 | } |
b89667eb | 8797 | \f |
7f89fd65 | 8798 | /* See infrun.h. */ |
0c557179 SDJ |
8799 | |
8800 | void | |
8801 | clear_exit_convenience_vars (void) | |
8802 | { | |
8803 | clear_internalvar (lookup_internalvar ("_exitsignal")); | |
8804 | clear_internalvar (lookup_internalvar ("_exitcode")); | |
8805 | } | |
c5aa993b | 8806 | \f |
488f131b | 8807 | |
b2175913 MS |
8808 | /* User interface for reverse debugging: |
8809 | Set exec-direction / show exec-direction commands | |
8810 | (returns error unless target implements to_set_exec_direction method). */ | |
8811 | ||
170742de | 8812 | enum exec_direction_kind execution_direction = EXEC_FORWARD; |
b2175913 MS |
8813 | static const char exec_forward[] = "forward"; |
8814 | static const char exec_reverse[] = "reverse"; | |
8815 | static const char *exec_direction = exec_forward; | |
40478521 | 8816 | static const char *const exec_direction_names[] = { |
b2175913 MS |
8817 | exec_forward, |
8818 | exec_reverse, | |
8819 | NULL | |
8820 | }; | |
8821 | ||
8822 | static void | |
eb4c3f4a | 8823 | set_exec_direction_func (const char *args, int from_tty, |
b2175913 MS |
8824 | struct cmd_list_element *cmd) |
8825 | { | |
8826 | if (target_can_execute_reverse) | |
8827 | { | |
8828 | if (!strcmp (exec_direction, exec_forward)) | |
8829 | execution_direction = EXEC_FORWARD; | |
8830 | else if (!strcmp (exec_direction, exec_reverse)) | |
8831 | execution_direction = EXEC_REVERSE; | |
8832 | } | |
8bbed405 MS |
8833 | else |
8834 | { | |
8835 | exec_direction = exec_forward; | |
8836 | error (_("Target does not support this operation.")); | |
8837 | } | |
b2175913 MS |
8838 | } |
8839 | ||
8840 | static void | |
8841 | show_exec_direction_func (struct ui_file *out, int from_tty, | |
8842 | struct cmd_list_element *cmd, const char *value) | |
8843 | { | |
8844 | switch (execution_direction) { | |
8845 | case EXEC_FORWARD: | |
8846 | fprintf_filtered (out, _("Forward.\n")); | |
8847 | break; | |
8848 | case EXEC_REVERSE: | |
8849 | fprintf_filtered (out, _("Reverse.\n")); | |
8850 | break; | |
b2175913 | 8851 | default: |
d8b34453 PA |
8852 | internal_error (__FILE__, __LINE__, |
8853 | _("bogus execution_direction value: %d"), | |
8854 | (int) execution_direction); | |
b2175913 MS |
8855 | } |
8856 | } | |
8857 | ||
d4db2f36 PA |
8858 | static void |
8859 | show_schedule_multiple (struct ui_file *file, int from_tty, | |
8860 | struct cmd_list_element *c, const char *value) | |
8861 | { | |
3e43a32a MS |
8862 | fprintf_filtered (file, _("Resuming the execution of threads " |
8863 | "of all processes is %s.\n"), value); | |
d4db2f36 | 8864 | } |
ad52ddc6 | 8865 | |
22d2b532 SDJ |
8866 | /* Implementation of `siginfo' variable. */ |
8867 | ||
8868 | static const struct internalvar_funcs siginfo_funcs = | |
8869 | { | |
8870 | siginfo_make_value, | |
8871 | NULL, | |
8872 | NULL | |
8873 | }; | |
8874 | ||
372316f1 PA |
8875 | /* Callback for infrun's target events source. This is marked when a |
8876 | thread has a pending status to process. */ | |
8877 | ||
8878 | static void | |
8879 | infrun_async_inferior_event_handler (gdb_client_data data) | |
8880 | { | |
372316f1 PA |
8881 | inferior_event_handler (INF_REG_EVENT, NULL); |
8882 | } | |
8883 | ||
c906108c | 8884 | void |
96baa820 | 8885 | _initialize_infrun (void) |
c906108c | 8886 | { |
de0bea00 | 8887 | struct cmd_list_element *c; |
c906108c | 8888 | |
372316f1 PA |
8889 | /* Register extra event sources in the event loop. */ |
8890 | infrun_async_inferior_event_token | |
8891 | = create_async_event_handler (infrun_async_inferior_event_handler, NULL); | |
8892 | ||
11db9430 | 8893 | add_info ("signals", info_signals_command, _("\ |
1bedd215 AC |
8894 | What debugger does when program gets various signals.\n\ |
8895 | Specify a signal as argument to print info on that signal only.")); | |
c906108c SS |
8896 | add_info_alias ("handle", "signals", 0); |
8897 | ||
de0bea00 | 8898 | c = add_com ("handle", class_run, handle_command, _("\ |
dfbd5e7b | 8899 | Specify how to handle signals.\n\ |
486c7739 | 8900 | Usage: handle SIGNAL [ACTIONS]\n\ |
c906108c | 8901 | Args are signals and actions to apply to those signals.\n\ |
dfbd5e7b | 8902 | If no actions are specified, the current settings for the specified signals\n\ |
486c7739 MF |
8903 | will be displayed instead.\n\ |
8904 | \n\ | |
c906108c SS |
8905 | Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\ |
8906 | from 1-15 are allowed for compatibility with old versions of GDB.\n\ | |
8907 | Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\ | |
8908 | The special arg \"all\" is recognized to mean all signals except those\n\ | |
1bedd215 | 8909 | used by the debugger, typically SIGTRAP and SIGINT.\n\ |
486c7739 | 8910 | \n\ |
1bedd215 | 8911 | Recognized actions include \"stop\", \"nostop\", \"print\", \"noprint\",\n\ |
c906108c SS |
8912 | \"pass\", \"nopass\", \"ignore\", or \"noignore\".\n\ |
8913 | Stop means reenter debugger if this signal happens (implies print).\n\ | |
8914 | Print means print a message if this signal happens.\n\ | |
8915 | Pass means let program see this signal; otherwise program doesn't know.\n\ | |
8916 | Ignore is a synonym for nopass and noignore is a synonym for pass.\n\ | |
dfbd5e7b PA |
8917 | Pass and Stop may be combined.\n\ |
8918 | \n\ | |
8919 | Multiple signals may be specified. Signal numbers and signal names\n\ | |
8920 | may be interspersed with actions, with the actions being performed for\n\ | |
8921 | all signals cumulatively specified.")); | |
de0bea00 | 8922 | set_cmd_completer (c, handle_completer); |
486c7739 | 8923 | |
c906108c | 8924 | if (!dbx_commands) |
1a966eab AC |
8925 | stop_command = add_cmd ("stop", class_obscure, |
8926 | not_just_help_class_command, _("\ | |
8927 | There is no `stop' command, but you can set a hook on `stop'.\n\ | |
c906108c | 8928 | This allows you to set a list of commands to be run each time execution\n\ |
1a966eab | 8929 | of the program stops."), &cmdlist); |
c906108c | 8930 | |
ccce17b0 | 8931 | add_setshow_zuinteger_cmd ("infrun", class_maintenance, &debug_infrun, _("\ |
85c07804 AC |
8932 | Set inferior debugging."), _("\ |
8933 | Show inferior debugging."), _("\ | |
8934 | When non-zero, inferior specific debugging is enabled."), | |
ccce17b0 YQ |
8935 | NULL, |
8936 | show_debug_infrun, | |
8937 | &setdebuglist, &showdebuglist); | |
527159b7 | 8938 | |
3e43a32a MS |
8939 | add_setshow_boolean_cmd ("displaced", class_maintenance, |
8940 | &debug_displaced, _("\ | |
237fc4c9 PA |
8941 | Set displaced stepping debugging."), _("\ |
8942 | Show displaced stepping debugging."), _("\ | |
8943 | When non-zero, displaced stepping specific debugging is enabled."), | |
8944 | NULL, | |
8945 | show_debug_displaced, | |
8946 | &setdebuglist, &showdebuglist); | |
8947 | ||
ad52ddc6 PA |
8948 | add_setshow_boolean_cmd ("non-stop", no_class, |
8949 | &non_stop_1, _("\ | |
8950 | Set whether gdb controls the inferior in non-stop mode."), _("\ | |
8951 | Show whether gdb controls the inferior in non-stop mode."), _("\ | |
8952 | When debugging a multi-threaded program and this setting is\n\ | |
8953 | off (the default, also called all-stop mode), when one thread stops\n\ | |
8954 | (for a breakpoint, watchpoint, exception, or similar events), GDB stops\n\ | |
8955 | all other threads in the program while you interact with the thread of\n\ | |
8956 | interest. When you continue or step a thread, you can allow the other\n\ | |
8957 | threads to run, or have them remain stopped, but while you inspect any\n\ | |
8958 | thread's state, all threads stop.\n\ | |
8959 | \n\ | |
8960 | In non-stop mode, when one thread stops, other threads can continue\n\ | |
8961 | to run freely. You'll be able to step each thread independently,\n\ | |
8962 | leave it stopped or free to run as needed."), | |
8963 | set_non_stop, | |
8964 | show_non_stop, | |
8965 | &setlist, | |
8966 | &showlist); | |
8967 | ||
adc6a863 | 8968 | for (size_t i = 0; i < GDB_SIGNAL_LAST; i++) |
c906108c SS |
8969 | { |
8970 | signal_stop[i] = 1; | |
8971 | signal_print[i] = 1; | |
8972 | signal_program[i] = 1; | |
ab04a2af | 8973 | signal_catch[i] = 0; |
c906108c SS |
8974 | } |
8975 | ||
4d9d9d04 PA |
8976 | /* Signals caused by debugger's own actions should not be given to |
8977 | the program afterwards. | |
8978 | ||
8979 | Do not deliver GDB_SIGNAL_TRAP by default, except when the user | |
8980 | explicitly specifies that it should be delivered to the target | |
8981 | program. Typically, that would occur when a user is debugging a | |
8982 | target monitor on a simulator: the target monitor sets a | |
8983 | breakpoint; the simulator encounters this breakpoint and halts | |
8984 | the simulation handing control to GDB; GDB, noting that the stop | |
8985 | address doesn't map to any known breakpoint, returns control back | |
8986 | to the simulator; the simulator then delivers the hardware | |
8987 | equivalent of a GDB_SIGNAL_TRAP to the program being | |
8988 | debugged. */ | |
a493e3e2 PA |
8989 | signal_program[GDB_SIGNAL_TRAP] = 0; |
8990 | signal_program[GDB_SIGNAL_INT] = 0; | |
c906108c SS |
8991 | |
8992 | /* Signals that are not errors should not normally enter the debugger. */ | |
a493e3e2 PA |
8993 | signal_stop[GDB_SIGNAL_ALRM] = 0; |
8994 | signal_print[GDB_SIGNAL_ALRM] = 0; | |
8995 | signal_stop[GDB_SIGNAL_VTALRM] = 0; | |
8996 | signal_print[GDB_SIGNAL_VTALRM] = 0; | |
8997 | signal_stop[GDB_SIGNAL_PROF] = 0; | |
8998 | signal_print[GDB_SIGNAL_PROF] = 0; | |
8999 | signal_stop[GDB_SIGNAL_CHLD] = 0; | |
9000 | signal_print[GDB_SIGNAL_CHLD] = 0; | |
9001 | signal_stop[GDB_SIGNAL_IO] = 0; | |
9002 | signal_print[GDB_SIGNAL_IO] = 0; | |
9003 | signal_stop[GDB_SIGNAL_POLL] = 0; | |
9004 | signal_print[GDB_SIGNAL_POLL] = 0; | |
9005 | signal_stop[GDB_SIGNAL_URG] = 0; | |
9006 | signal_print[GDB_SIGNAL_URG] = 0; | |
9007 | signal_stop[GDB_SIGNAL_WINCH] = 0; | |
9008 | signal_print[GDB_SIGNAL_WINCH] = 0; | |
9009 | signal_stop[GDB_SIGNAL_PRIO] = 0; | |
9010 | signal_print[GDB_SIGNAL_PRIO] = 0; | |
c906108c | 9011 | |
cd0fc7c3 SS |
9012 | /* These signals are used internally by user-level thread |
9013 | implementations. (See signal(5) on Solaris.) Like the above | |
9014 | signals, a healthy program receives and handles them as part of | |
9015 | its normal operation. */ | |
a493e3e2 PA |
9016 | signal_stop[GDB_SIGNAL_LWP] = 0; |
9017 | signal_print[GDB_SIGNAL_LWP] = 0; | |
9018 | signal_stop[GDB_SIGNAL_WAITING] = 0; | |
9019 | signal_print[GDB_SIGNAL_WAITING] = 0; | |
9020 | signal_stop[GDB_SIGNAL_CANCEL] = 0; | |
9021 | signal_print[GDB_SIGNAL_CANCEL] = 0; | |
bc7b765a JB |
9022 | signal_stop[GDB_SIGNAL_LIBRT] = 0; |
9023 | signal_print[GDB_SIGNAL_LIBRT] = 0; | |
cd0fc7c3 | 9024 | |
2455069d UW |
9025 | /* Update cached state. */ |
9026 | signal_cache_update (-1); | |
9027 | ||
85c07804 AC |
9028 | add_setshow_zinteger_cmd ("stop-on-solib-events", class_support, |
9029 | &stop_on_solib_events, _("\ | |
9030 | Set stopping for shared library events."), _("\ | |
9031 | Show stopping for shared library events."), _("\ | |
c906108c SS |
9032 | If nonzero, gdb will give control to the user when the dynamic linker\n\ |
9033 | notifies gdb of shared library events. The most common event of interest\n\ | |
85c07804 | 9034 | to the user would be loading/unloading of a new library."), |
f9e14852 | 9035 | set_stop_on_solib_events, |
920d2a44 | 9036 | show_stop_on_solib_events, |
85c07804 | 9037 | &setlist, &showlist); |
c906108c | 9038 | |
7ab04401 AC |
9039 | add_setshow_enum_cmd ("follow-fork-mode", class_run, |
9040 | follow_fork_mode_kind_names, | |
9041 | &follow_fork_mode_string, _("\ | |
9042 | Set debugger response to a program call of fork or vfork."), _("\ | |
9043 | Show debugger response to a program call of fork or vfork."), _("\ | |
c906108c SS |
9044 | A fork or vfork creates a new process. follow-fork-mode can be:\n\ |
9045 | parent - the original process is debugged after a fork\n\ | |
9046 | child - the new process is debugged after a fork\n\ | |
ea1dd7bc | 9047 | The unfollowed process will continue to run.\n\ |
7ab04401 AC |
9048 | By default, the debugger will follow the parent process."), |
9049 | NULL, | |
920d2a44 | 9050 | show_follow_fork_mode_string, |
7ab04401 AC |
9051 | &setlist, &showlist); |
9052 | ||
6c95b8df PA |
9053 | add_setshow_enum_cmd ("follow-exec-mode", class_run, |
9054 | follow_exec_mode_names, | |
9055 | &follow_exec_mode_string, _("\ | |
9056 | Set debugger response to a program call of exec."), _("\ | |
9057 | Show debugger response to a program call of exec."), _("\ | |
9058 | An exec call replaces the program image of a process.\n\ | |
9059 | \n\ | |
9060 | follow-exec-mode can be:\n\ | |
9061 | \n\ | |
cce7e648 | 9062 | new - the debugger creates a new inferior and rebinds the process\n\ |
6c95b8df PA |
9063 | to this new inferior. The program the process was running before\n\ |
9064 | the exec call can be restarted afterwards by restarting the original\n\ | |
9065 | inferior.\n\ | |
9066 | \n\ | |
9067 | same - the debugger keeps the process bound to the same inferior.\n\ | |
9068 | The new executable image replaces the previous executable loaded in\n\ | |
9069 | the inferior. Restarting the inferior after the exec call restarts\n\ | |
9070 | the executable the process was running after the exec call.\n\ | |
9071 | \n\ | |
9072 | By default, the debugger will use the same inferior."), | |
9073 | NULL, | |
9074 | show_follow_exec_mode_string, | |
9075 | &setlist, &showlist); | |
9076 | ||
7ab04401 AC |
9077 | add_setshow_enum_cmd ("scheduler-locking", class_run, |
9078 | scheduler_enums, &scheduler_mode, _("\ | |
9079 | Set mode for locking scheduler during execution."), _("\ | |
9080 | Show mode for locking scheduler during execution."), _("\ | |
f2665db5 MM |
9081 | off == no locking (threads may preempt at any time)\n\ |
9082 | on == full locking (no thread except the current thread may run)\n\ | |
9083 | This applies to both normal execution and replay mode.\n\ | |
9084 | step == scheduler locked during stepping commands (step, next, stepi, nexti).\n\ | |
9085 | In this mode, other threads may run during other commands.\n\ | |
9086 | This applies to both normal execution and replay mode.\n\ | |
9087 | replay == scheduler locked in replay mode and unlocked during normal execution."), | |
7ab04401 | 9088 | set_schedlock_func, /* traps on target vector */ |
920d2a44 | 9089 | show_scheduler_mode, |
7ab04401 | 9090 | &setlist, &showlist); |
5fbbeb29 | 9091 | |
d4db2f36 PA |
9092 | add_setshow_boolean_cmd ("schedule-multiple", class_run, &sched_multi, _("\ |
9093 | Set mode for resuming threads of all processes."), _("\ | |
9094 | Show mode for resuming threads of all processes."), _("\ | |
9095 | When on, execution commands (such as 'continue' or 'next') resume all\n\ | |
9096 | threads of all processes. When off (which is the default), execution\n\ | |
9097 | commands only resume the threads of the current process. The set of\n\ | |
9098 | threads that are resumed is further refined by the scheduler-locking\n\ | |
9099 | mode (see help set scheduler-locking)."), | |
9100 | NULL, | |
9101 | show_schedule_multiple, | |
9102 | &setlist, &showlist); | |
9103 | ||
5bf193a2 AC |
9104 | add_setshow_boolean_cmd ("step-mode", class_run, &step_stop_if_no_debug, _("\ |
9105 | Set mode of the step operation."), _("\ | |
9106 | Show mode of the step operation."), _("\ | |
9107 | When set, doing a step over a function without debug line information\n\ | |
9108 | will stop at the first instruction of that function. Otherwise, the\n\ | |
9109 | function is skipped and the step command stops at a different source line."), | |
9110 | NULL, | |
920d2a44 | 9111 | show_step_stop_if_no_debug, |
5bf193a2 | 9112 | &setlist, &showlist); |
ca6724c1 | 9113 | |
72d0e2c5 YQ |
9114 | add_setshow_auto_boolean_cmd ("displaced-stepping", class_run, |
9115 | &can_use_displaced_stepping, _("\ | |
237fc4c9 PA |
9116 | Set debugger's willingness to use displaced stepping."), _("\ |
9117 | Show debugger's willingness to use displaced stepping."), _("\ | |
fff08868 HZ |
9118 | If on, gdb will use displaced stepping to step over breakpoints if it is\n\ |
9119 | supported by the target architecture. If off, gdb will not use displaced\n\ | |
9120 | stepping to step over breakpoints, even if such is supported by the target\n\ | |
9121 | architecture. If auto (which is the default), gdb will use displaced stepping\n\ | |
9122 | if the target architecture supports it and non-stop mode is active, but will not\n\ | |
9123 | use it in all-stop mode (see help set non-stop)."), | |
72d0e2c5 YQ |
9124 | NULL, |
9125 | show_can_use_displaced_stepping, | |
9126 | &setlist, &showlist); | |
237fc4c9 | 9127 | |
b2175913 MS |
9128 | add_setshow_enum_cmd ("exec-direction", class_run, exec_direction_names, |
9129 | &exec_direction, _("Set direction of execution.\n\ | |
9130 | Options are 'forward' or 'reverse'."), | |
9131 | _("Show direction of execution (forward/reverse)."), | |
9132 | _("Tells gdb whether to execute forward or backward."), | |
9133 | set_exec_direction_func, show_exec_direction_func, | |
9134 | &setlist, &showlist); | |
9135 | ||
6c95b8df PA |
9136 | /* Set/show detach-on-fork: user-settable mode. */ |
9137 | ||
9138 | add_setshow_boolean_cmd ("detach-on-fork", class_run, &detach_fork, _("\ | |
9139 | Set whether gdb will detach the child of a fork."), _("\ | |
9140 | Show whether gdb will detach the child of a fork."), _("\ | |
9141 | Tells gdb whether to detach the child of a fork."), | |
9142 | NULL, NULL, &setlist, &showlist); | |
9143 | ||
03583c20 UW |
9144 | /* Set/show disable address space randomization mode. */ |
9145 | ||
9146 | add_setshow_boolean_cmd ("disable-randomization", class_support, | |
9147 | &disable_randomization, _("\ | |
9148 | Set disabling of debuggee's virtual address space randomization."), _("\ | |
9149 | Show disabling of debuggee's virtual address space randomization."), _("\ | |
9150 | When this mode is on (which is the default), randomization of the virtual\n\ | |
9151 | address space is disabled. Standalone programs run with the randomization\n\ | |
9152 | enabled by default on some platforms."), | |
9153 | &set_disable_randomization, | |
9154 | &show_disable_randomization, | |
9155 | &setlist, &showlist); | |
9156 | ||
ca6724c1 | 9157 | /* ptid initializations */ |
ca6724c1 KB |
9158 | inferior_ptid = null_ptid; |
9159 | target_last_wait_ptid = minus_one_ptid; | |
5231c1fd | 9160 | |
76727919 TT |
9161 | gdb::observers::thread_ptid_changed.attach (infrun_thread_ptid_changed); |
9162 | gdb::observers::thread_stop_requested.attach (infrun_thread_stop_requested); | |
9163 | gdb::observers::thread_exit.attach (infrun_thread_thread_exit); | |
9164 | gdb::observers::inferior_exit.attach (infrun_inferior_exit); | |
4aa995e1 PA |
9165 | |
9166 | /* Explicitly create without lookup, since that tries to create a | |
9167 | value with a void typed value, and when we get here, gdbarch | |
9168 | isn't initialized yet. At this point, we're quite sure there | |
9169 | isn't another convenience variable of the same name. */ | |
22d2b532 | 9170 | create_internalvar_type_lazy ("_siginfo", &siginfo_funcs, NULL); |
d914c394 SS |
9171 | |
9172 | add_setshow_boolean_cmd ("observer", no_class, | |
9173 | &observer_mode_1, _("\ | |
9174 | Set whether gdb controls the inferior in observer mode."), _("\ | |
9175 | Show whether gdb controls the inferior in observer mode."), _("\ | |
9176 | In observer mode, GDB can get data from the inferior, but not\n\ | |
9177 | affect its execution. Registers and memory may not be changed,\n\ | |
9178 | breakpoints may not be set, and the program cannot be interrupted\n\ | |
9179 | or signalled."), | |
9180 | set_observer_mode, | |
9181 | show_observer_mode, | |
9182 | &setlist, | |
9183 | &showlist); | |
c906108c | 9184 | } |