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" | |
03f2053f | 28 | #include "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" |
c906108c SS |
71 | |
72 | /* Prototypes for local functions */ | |
73 | ||
2ea28649 | 74 | static void sig_print_info (enum gdb_signal); |
c906108c | 75 | |
96baa820 | 76 | static void sig_print_header (void); |
c906108c | 77 | |
4ef3f3be | 78 | static int follow_fork (void); |
96baa820 | 79 | |
d83ad864 DB |
80 | static int follow_fork_inferior (int follow_child, int detach_fork); |
81 | ||
82 | static void follow_inferior_reset_breakpoints (void); | |
83 | ||
a289b8f6 JK |
84 | static int currently_stepping (struct thread_info *tp); |
85 | ||
e58b0e63 PA |
86 | void nullify_last_target_wait_ptid (void); |
87 | ||
2c03e5be | 88 | static void insert_hp_step_resume_breakpoint_at_frame (struct frame_info *); |
2484c66b UW |
89 | |
90 | static void insert_step_resume_breakpoint_at_caller (struct frame_info *); | |
91 | ||
2484c66b UW |
92 | static void insert_longjmp_resume_breakpoint (struct gdbarch *, CORE_ADDR); |
93 | ||
8550d3b3 YQ |
94 | static int maybe_software_singlestep (struct gdbarch *gdbarch, CORE_ADDR pc); |
95 | ||
aff4e175 AB |
96 | static void resume (gdb_signal sig); |
97 | ||
372316f1 PA |
98 | /* Asynchronous signal handler registered as event loop source for |
99 | when we have pending events ready to be passed to the core. */ | |
100 | static struct async_event_handler *infrun_async_inferior_event_token; | |
101 | ||
102 | /* Stores whether infrun_async was previously enabled or disabled. | |
103 | Starts off as -1, indicating "never enabled/disabled". */ | |
104 | static int infrun_is_async = -1; | |
105 | ||
106 | /* See infrun.h. */ | |
107 | ||
108 | void | |
109 | infrun_async (int enable) | |
110 | { | |
111 | if (infrun_is_async != enable) | |
112 | { | |
113 | infrun_is_async = enable; | |
114 | ||
115 | if (debug_infrun) | |
116 | fprintf_unfiltered (gdb_stdlog, | |
117 | "infrun: infrun_async(%d)\n", | |
118 | enable); | |
119 | ||
120 | if (enable) | |
121 | mark_async_event_handler (infrun_async_inferior_event_token); | |
122 | else | |
123 | clear_async_event_handler (infrun_async_inferior_event_token); | |
124 | } | |
125 | } | |
126 | ||
0b333c5e PA |
127 | /* See infrun.h. */ |
128 | ||
129 | void | |
130 | mark_infrun_async_event_handler (void) | |
131 | { | |
132 | mark_async_event_handler (infrun_async_inferior_event_token); | |
133 | } | |
134 | ||
5fbbeb29 CF |
135 | /* When set, stop the 'step' command if we enter a function which has |
136 | no line number information. The normal behavior is that we step | |
137 | over such function. */ | |
138 | int step_stop_if_no_debug = 0; | |
920d2a44 AC |
139 | static void |
140 | show_step_stop_if_no_debug (struct ui_file *file, int from_tty, | |
141 | struct cmd_list_element *c, const char *value) | |
142 | { | |
143 | fprintf_filtered (file, _("Mode of the step operation is %s.\n"), value); | |
144 | } | |
5fbbeb29 | 145 | |
b9f437de PA |
146 | /* proceed and normal_stop use this to notify the user when the |
147 | inferior stopped in a different thread than it had been running | |
148 | in. */ | |
96baa820 | 149 | |
39f77062 | 150 | static ptid_t previous_inferior_ptid; |
7a292a7a | 151 | |
07107ca6 LM |
152 | /* If set (default for legacy reasons), when following a fork, GDB |
153 | will detach from one of the fork branches, child or parent. | |
154 | Exactly which branch is detached depends on 'set follow-fork-mode' | |
155 | setting. */ | |
156 | ||
157 | static int detach_fork = 1; | |
6c95b8df | 158 | |
237fc4c9 PA |
159 | int debug_displaced = 0; |
160 | static void | |
161 | show_debug_displaced (struct ui_file *file, int from_tty, | |
162 | struct cmd_list_element *c, const char *value) | |
163 | { | |
164 | fprintf_filtered (file, _("Displace stepping debugging is %s.\n"), value); | |
165 | } | |
166 | ||
ccce17b0 | 167 | unsigned int debug_infrun = 0; |
920d2a44 AC |
168 | static void |
169 | show_debug_infrun (struct ui_file *file, int from_tty, | |
170 | struct cmd_list_element *c, const char *value) | |
171 | { | |
172 | fprintf_filtered (file, _("Inferior debugging is %s.\n"), value); | |
173 | } | |
527159b7 | 174 | |
03583c20 UW |
175 | |
176 | /* Support for disabling address space randomization. */ | |
177 | ||
178 | int disable_randomization = 1; | |
179 | ||
180 | static void | |
181 | show_disable_randomization (struct ui_file *file, int from_tty, | |
182 | struct cmd_list_element *c, const char *value) | |
183 | { | |
184 | if (target_supports_disable_randomization ()) | |
185 | fprintf_filtered (file, | |
186 | _("Disabling randomization of debuggee's " | |
187 | "virtual address space is %s.\n"), | |
188 | value); | |
189 | else | |
190 | fputs_filtered (_("Disabling randomization of debuggee's " | |
191 | "virtual address space is unsupported on\n" | |
192 | "this platform.\n"), file); | |
193 | } | |
194 | ||
195 | static void | |
eb4c3f4a | 196 | set_disable_randomization (const char *args, int from_tty, |
03583c20 UW |
197 | struct cmd_list_element *c) |
198 | { | |
199 | if (!target_supports_disable_randomization ()) | |
200 | error (_("Disabling randomization of debuggee's " | |
201 | "virtual address space is unsupported on\n" | |
202 | "this platform.")); | |
203 | } | |
204 | ||
d32dc48e PA |
205 | /* User interface for non-stop mode. */ |
206 | ||
207 | int non_stop = 0; | |
208 | static int non_stop_1 = 0; | |
209 | ||
210 | static void | |
eb4c3f4a | 211 | set_non_stop (const char *args, int from_tty, |
d32dc48e PA |
212 | struct cmd_list_element *c) |
213 | { | |
214 | if (target_has_execution) | |
215 | { | |
216 | non_stop_1 = non_stop; | |
217 | error (_("Cannot change this setting while the inferior is running.")); | |
218 | } | |
219 | ||
220 | non_stop = non_stop_1; | |
221 | } | |
222 | ||
223 | static void | |
224 | show_non_stop (struct ui_file *file, int from_tty, | |
225 | struct cmd_list_element *c, const char *value) | |
226 | { | |
227 | fprintf_filtered (file, | |
228 | _("Controlling the inferior in non-stop mode is %s.\n"), | |
229 | value); | |
230 | } | |
231 | ||
d914c394 SS |
232 | /* "Observer mode" is somewhat like a more extreme version of |
233 | non-stop, in which all GDB operations that might affect the | |
234 | target's execution have been disabled. */ | |
235 | ||
d914c394 SS |
236 | int observer_mode = 0; |
237 | static int observer_mode_1 = 0; | |
238 | ||
239 | static void | |
eb4c3f4a | 240 | set_observer_mode (const char *args, int from_tty, |
d914c394 SS |
241 | struct cmd_list_element *c) |
242 | { | |
d914c394 SS |
243 | if (target_has_execution) |
244 | { | |
245 | observer_mode_1 = observer_mode; | |
246 | error (_("Cannot change this setting while the inferior is running.")); | |
247 | } | |
248 | ||
249 | observer_mode = observer_mode_1; | |
250 | ||
251 | may_write_registers = !observer_mode; | |
252 | may_write_memory = !observer_mode; | |
253 | may_insert_breakpoints = !observer_mode; | |
254 | may_insert_tracepoints = !observer_mode; | |
255 | /* We can insert fast tracepoints in or out of observer mode, | |
256 | but enable them if we're going into this mode. */ | |
257 | if (observer_mode) | |
258 | may_insert_fast_tracepoints = 1; | |
259 | may_stop = !observer_mode; | |
260 | update_target_permissions (); | |
261 | ||
262 | /* Going *into* observer mode we must force non-stop, then | |
263 | going out we leave it that way. */ | |
264 | if (observer_mode) | |
265 | { | |
d914c394 SS |
266 | pagination_enabled = 0; |
267 | non_stop = non_stop_1 = 1; | |
268 | } | |
269 | ||
270 | if (from_tty) | |
271 | printf_filtered (_("Observer mode is now %s.\n"), | |
272 | (observer_mode ? "on" : "off")); | |
273 | } | |
274 | ||
275 | static void | |
276 | show_observer_mode (struct ui_file *file, int from_tty, | |
277 | struct cmd_list_element *c, const char *value) | |
278 | { | |
279 | fprintf_filtered (file, _("Observer mode is %s.\n"), value); | |
280 | } | |
281 | ||
282 | /* This updates the value of observer mode based on changes in | |
283 | permissions. Note that we are deliberately ignoring the values of | |
284 | may-write-registers and may-write-memory, since the user may have | |
285 | reason to enable these during a session, for instance to turn on a | |
286 | debugging-related global. */ | |
287 | ||
288 | void | |
289 | update_observer_mode (void) | |
290 | { | |
291 | int newval; | |
292 | ||
293 | newval = (!may_insert_breakpoints | |
294 | && !may_insert_tracepoints | |
295 | && may_insert_fast_tracepoints | |
296 | && !may_stop | |
297 | && non_stop); | |
298 | ||
299 | /* Let the user know if things change. */ | |
300 | if (newval != observer_mode) | |
301 | printf_filtered (_("Observer mode is now %s.\n"), | |
302 | (newval ? "on" : "off")); | |
303 | ||
304 | observer_mode = observer_mode_1 = newval; | |
305 | } | |
c2c6d25f | 306 | |
c906108c SS |
307 | /* Tables of how to react to signals; the user sets them. */ |
308 | ||
309 | static unsigned char *signal_stop; | |
310 | static unsigned char *signal_print; | |
311 | static unsigned char *signal_program; | |
312 | ||
ab04a2af TT |
313 | /* Table of signals that are registered with "catch signal". A |
314 | non-zero entry indicates that the signal is caught by some "catch | |
315 | signal" command. This has size GDB_SIGNAL_LAST, to accommodate all | |
316 | signals. */ | |
317 | static unsigned char *signal_catch; | |
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. */ | |
322 | static unsigned char *signal_pass; | |
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 | { | |
a493e3e2 | 346 | target_program_signals ((int) GDB_SIGNAL_LAST, 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", |
8dd06f7a | 474 | target_pid_to_str (process_ptid)); |
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"), | |
8dd06f7a | 610 | target_pid_to_str (process_ptid)); |
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", | |
879 | target_pid_to_str (thread->ptid)); | |
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 | |
918 | between the parent and the child. If the user wanted to | |
919 | detach from the parent, now is the time. */ | |
920 | ||
921 | if (inf->vfork_parent->pending_detach) | |
922 | { | |
923 | struct thread_info *tp; | |
6c95b8df PA |
924 | struct program_space *pspace; |
925 | struct address_space *aspace; | |
926 | ||
1777feb0 | 927 | /* follow-fork child, detach-on-fork on. */ |
6c95b8df | 928 | |
68c9da30 PA |
929 | inf->vfork_parent->pending_detach = 0; |
930 | ||
5ed8105e PA |
931 | gdb::optional<scoped_restore_exited_inferior> |
932 | maybe_restore_inferior; | |
933 | gdb::optional<scoped_restore_current_pspace_and_thread> | |
934 | maybe_restore_thread; | |
935 | ||
936 | /* If we're handling a child exit, then inferior_ptid points | |
937 | at the inferior's pid, not to a thread. */ | |
f50f4e56 | 938 | if (!exec) |
5ed8105e | 939 | maybe_restore_inferior.emplace (); |
f50f4e56 | 940 | else |
5ed8105e | 941 | maybe_restore_thread.emplace (); |
6c95b8df PA |
942 | |
943 | /* We're letting loose of the parent. */ | |
00431a78 PA |
944 | tp = any_live_thread_of_inferior (inf->vfork_parent); |
945 | switch_to_thread (tp); | |
6c95b8df PA |
946 | |
947 | /* We're about to detach from the parent, which implicitly | |
948 | removes breakpoints from its address space. There's a | |
949 | catch here: we want to reuse the spaces for the child, | |
950 | but, parent/child are still sharing the pspace at this | |
951 | point, although the exec in reality makes the kernel give | |
952 | the child a fresh set of new pages. The problem here is | |
953 | that the breakpoints module being unaware of this, would | |
954 | likely chose the child process to write to the parent | |
955 | address space. Swapping the child temporarily away from | |
956 | the spaces has the desired effect. Yes, this is "sort | |
957 | of" a hack. */ | |
958 | ||
959 | pspace = inf->pspace; | |
960 | aspace = inf->aspace; | |
961 | inf->aspace = NULL; | |
962 | inf->pspace = NULL; | |
963 | ||
f67c0c91 | 964 | if (print_inferior_events) |
6c95b8df | 965 | { |
f67c0c91 | 966 | const char *pidstr |
f2907e49 | 967 | = target_pid_to_str (ptid_t (inf->vfork_parent->pid)); |
f67c0c91 | 968 | |
223ffa71 | 969 | target_terminal::ours_for_output (); |
6c95b8df PA |
970 | |
971 | if (exec) | |
6f259a23 DB |
972 | { |
973 | fprintf_filtered (gdb_stdlog, | |
f67c0c91 SDJ |
974 | _("[Detaching vfork parent %s " |
975 | "after child exec]\n"), pidstr); | |
6f259a23 | 976 | } |
6c95b8df | 977 | else |
6f259a23 DB |
978 | { |
979 | fprintf_filtered (gdb_stdlog, | |
f67c0c91 SDJ |
980 | _("[Detaching vfork parent %s " |
981 | "after child exit]\n"), pidstr); | |
6f259a23 | 982 | } |
6c95b8df PA |
983 | } |
984 | ||
6e1e1966 | 985 | target_detach (inf->vfork_parent, 0); |
6c95b8df PA |
986 | |
987 | /* Put it back. */ | |
988 | inf->pspace = pspace; | |
989 | inf->aspace = aspace; | |
6c95b8df PA |
990 | } |
991 | else if (exec) | |
992 | { | |
993 | /* We're staying attached to the parent, so, really give the | |
994 | child a new address space. */ | |
564b1e3f | 995 | inf->pspace = new program_space (maybe_new_address_space ()); |
6c95b8df PA |
996 | inf->aspace = inf->pspace->aspace; |
997 | inf->removable = 1; | |
998 | set_current_program_space (inf->pspace); | |
999 | ||
1000 | resume_parent = inf->vfork_parent->pid; | |
1001 | ||
1002 | /* Break the bonds. */ | |
1003 | inf->vfork_parent->vfork_child = NULL; | |
1004 | } | |
1005 | else | |
1006 | { | |
6c95b8df PA |
1007 | struct program_space *pspace; |
1008 | ||
1009 | /* If this is a vfork child exiting, then the pspace and | |
1010 | aspaces were shared with the parent. Since we're | |
1011 | reporting the process exit, we'll be mourning all that is | |
1012 | found in the address space, and switching to null_ptid, | |
1013 | preparing to start a new inferior. But, since we don't | |
1014 | want to clobber the parent's address/program spaces, we | |
1015 | go ahead and create a new one for this exiting | |
1016 | inferior. */ | |
1017 | ||
5ed8105e PA |
1018 | /* Switch to null_ptid while running clone_program_space, so |
1019 | that clone_program_space doesn't want to read the | |
1020 | selected frame of a dead process. */ | |
1021 | scoped_restore restore_ptid | |
1022 | = make_scoped_restore (&inferior_ptid, null_ptid); | |
6c95b8df PA |
1023 | |
1024 | /* This inferior is dead, so avoid giving the breakpoints | |
1025 | module the option to write through to it (cloning a | |
1026 | program space resets breakpoints). */ | |
1027 | inf->aspace = NULL; | |
1028 | inf->pspace = NULL; | |
564b1e3f | 1029 | pspace = new program_space (maybe_new_address_space ()); |
6c95b8df PA |
1030 | set_current_program_space (pspace); |
1031 | inf->removable = 1; | |
7dcd53a0 | 1032 | inf->symfile_flags = SYMFILE_NO_READ; |
6c95b8df PA |
1033 | clone_program_space (pspace, inf->vfork_parent->pspace); |
1034 | inf->pspace = pspace; | |
1035 | inf->aspace = pspace->aspace; | |
1036 | ||
6c95b8df PA |
1037 | resume_parent = inf->vfork_parent->pid; |
1038 | /* Break the bonds. */ | |
1039 | inf->vfork_parent->vfork_child = NULL; | |
1040 | } | |
1041 | ||
1042 | inf->vfork_parent = NULL; | |
1043 | ||
1044 | gdb_assert (current_program_space == inf->pspace); | |
1045 | ||
1046 | if (non_stop && resume_parent != -1) | |
1047 | { | |
1048 | /* If the user wanted the parent to be running, let it go | |
1049 | free now. */ | |
5ed8105e | 1050 | scoped_restore_current_thread restore_thread; |
6c95b8df PA |
1051 | |
1052 | if (debug_infrun) | |
3e43a32a MS |
1053 | fprintf_unfiltered (gdb_stdlog, |
1054 | "infrun: resuming vfork parent process %d\n", | |
6c95b8df PA |
1055 | resume_parent); |
1056 | ||
1057 | iterate_over_threads (proceed_after_vfork_done, &resume_parent); | |
6c95b8df PA |
1058 | } |
1059 | } | |
1060 | } | |
1061 | ||
eb6c553b | 1062 | /* Enum strings for "set|show follow-exec-mode". */ |
6c95b8df PA |
1063 | |
1064 | static const char follow_exec_mode_new[] = "new"; | |
1065 | static const char follow_exec_mode_same[] = "same"; | |
40478521 | 1066 | static const char *const follow_exec_mode_names[] = |
6c95b8df PA |
1067 | { |
1068 | follow_exec_mode_new, | |
1069 | follow_exec_mode_same, | |
1070 | NULL, | |
1071 | }; | |
1072 | ||
1073 | static const char *follow_exec_mode_string = follow_exec_mode_same; | |
1074 | static void | |
1075 | show_follow_exec_mode_string (struct ui_file *file, int from_tty, | |
1076 | struct cmd_list_element *c, const char *value) | |
1077 | { | |
1078 | fprintf_filtered (file, _("Follow exec mode is \"%s\".\n"), value); | |
1079 | } | |
1080 | ||
ecf45d2c | 1081 | /* EXEC_FILE_TARGET is assumed to be non-NULL. */ |
1adeb98a | 1082 | |
c906108c | 1083 | static void |
ecf45d2c | 1084 | follow_exec (ptid_t ptid, char *exec_file_target) |
c906108c | 1085 | { |
6c95b8df | 1086 | struct inferior *inf = current_inferior (); |
e99b03dc | 1087 | int pid = ptid.pid (); |
94585166 | 1088 | ptid_t process_ptid; |
7a292a7a | 1089 | |
c906108c SS |
1090 | /* This is an exec event that we actually wish to pay attention to. |
1091 | Refresh our symbol table to the newly exec'd program, remove any | |
1092 | momentary bp's, etc. | |
1093 | ||
1094 | If there are breakpoints, they aren't really inserted now, | |
1095 | since the exec() transformed our inferior into a fresh set | |
1096 | of instructions. | |
1097 | ||
1098 | We want to preserve symbolic breakpoints on the list, since | |
1099 | we have hopes that they can be reset after the new a.out's | |
1100 | symbol table is read. | |
1101 | ||
1102 | However, any "raw" breakpoints must be removed from the list | |
1103 | (e.g., the solib bp's), since their address is probably invalid | |
1104 | now. | |
1105 | ||
1106 | And, we DON'T want to call delete_breakpoints() here, since | |
1107 | that may write the bp's "shadow contents" (the instruction | |
1108 | value that was overwritten witha TRAP instruction). Since | |
1777feb0 | 1109 | we now have a new a.out, those shadow contents aren't valid. */ |
6c95b8df PA |
1110 | |
1111 | mark_breakpoints_out (); | |
1112 | ||
95e50b27 PA |
1113 | /* The target reports the exec event to the main thread, even if |
1114 | some other thread does the exec, and even if the main thread was | |
1115 | stopped or already gone. We may still have non-leader threads of | |
1116 | the process on our list. E.g., on targets that don't have thread | |
1117 | exit events (like remote); or on native Linux in non-stop mode if | |
1118 | there were only two threads in the inferior and the non-leader | |
1119 | one is the one that execs (and nothing forces an update of the | |
1120 | thread list up to here). When debugging remotely, it's best to | |
1121 | avoid extra traffic, when possible, so avoid syncing the thread | |
1122 | list with the target, and instead go ahead and delete all threads | |
1123 | of the process but one that reported the event. Note this must | |
1124 | be done before calling update_breakpoints_after_exec, as | |
1125 | otherwise clearing the threads' resources would reference stale | |
1126 | thread breakpoints -- it may have been one of these threads that | |
1127 | stepped across the exec. We could just clear their stepping | |
1128 | states, but as long as we're iterating, might as well delete | |
1129 | them. Deleting them now rather than at the next user-visible | |
1130 | stop provides a nicer sequence of events for user and MI | |
1131 | notifications. */ | |
08036331 | 1132 | for (thread_info *th : all_threads_safe ()) |
d7e15655 | 1133 | if (th->ptid.pid () == pid && th->ptid != ptid) |
00431a78 | 1134 | delete_thread (th); |
95e50b27 PA |
1135 | |
1136 | /* We also need to clear any left over stale state for the | |
1137 | leader/event thread. E.g., if there was any step-resume | |
1138 | breakpoint or similar, it's gone now. We cannot truly | |
1139 | step-to-next statement through an exec(). */ | |
08036331 | 1140 | thread_info *th = inferior_thread (); |
8358c15c | 1141 | th->control.step_resume_breakpoint = NULL; |
186c406b | 1142 | th->control.exception_resume_breakpoint = NULL; |
34b7e8a6 | 1143 | th->control.single_step_breakpoints = NULL; |
16c381f0 JK |
1144 | th->control.step_range_start = 0; |
1145 | th->control.step_range_end = 0; | |
c906108c | 1146 | |
95e50b27 PA |
1147 | /* The user may have had the main thread held stopped in the |
1148 | previous image (e.g., schedlock on, or non-stop). Release | |
1149 | it now. */ | |
a75724bc PA |
1150 | th->stop_requested = 0; |
1151 | ||
95e50b27 PA |
1152 | update_breakpoints_after_exec (); |
1153 | ||
1777feb0 | 1154 | /* What is this a.out's name? */ |
f2907e49 | 1155 | process_ptid = ptid_t (pid); |
6c95b8df | 1156 | printf_unfiltered (_("%s is executing new program: %s\n"), |
94585166 | 1157 | target_pid_to_str (process_ptid), |
ecf45d2c | 1158 | exec_file_target); |
c906108c SS |
1159 | |
1160 | /* We've followed the inferior through an exec. Therefore, the | |
1777feb0 | 1161 | inferior has essentially been killed & reborn. */ |
7a292a7a | 1162 | |
c906108c | 1163 | gdb_flush (gdb_stdout); |
6ca15a4b PA |
1164 | |
1165 | breakpoint_init_inferior (inf_execd); | |
e85a822c | 1166 | |
797bc1cb TT |
1167 | gdb::unique_xmalloc_ptr<char> exec_file_host |
1168 | = exec_file_find (exec_file_target, NULL); | |
ff862be4 | 1169 | |
ecf45d2c SL |
1170 | /* If we were unable to map the executable target pathname onto a host |
1171 | pathname, tell the user that. Otherwise GDB's subsequent behavior | |
1172 | is confusing. Maybe it would even be better to stop at this point | |
1173 | so that the user can specify a file manually before continuing. */ | |
1174 | if (exec_file_host == NULL) | |
1175 | warning (_("Could not load symbols for executable %s.\n" | |
1176 | "Do you need \"set sysroot\"?"), | |
1177 | exec_file_target); | |
c906108c | 1178 | |
cce9b6bf PA |
1179 | /* Reset the shared library package. This ensures that we get a |
1180 | shlib event when the child reaches "_start", at which point the | |
1181 | dld will have had a chance to initialize the child. */ | |
1182 | /* Also, loading a symbol file below may trigger symbol lookups, and | |
1183 | we don't want those to be satisfied by the libraries of the | |
1184 | previous incarnation of this process. */ | |
1185 | no_shared_libraries (NULL, 0); | |
1186 | ||
6c95b8df PA |
1187 | if (follow_exec_mode_string == follow_exec_mode_new) |
1188 | { | |
6c95b8df PA |
1189 | /* The user wants to keep the old inferior and program spaces |
1190 | around. Create a new fresh one, and switch to it. */ | |
1191 | ||
35ed81d4 SM |
1192 | /* Do exit processing for the original inferior before setting the new |
1193 | inferior's pid. Having two inferiors with the same pid would confuse | |
1194 | find_inferior_p(t)id. Transfer the terminal state and info from the | |
1195 | old to the new inferior. */ | |
1196 | inf = add_inferior_with_spaces (); | |
1197 | swap_terminal_info (inf, current_inferior ()); | |
057302ce | 1198 | exit_inferior_silent (current_inferior ()); |
17d8546e | 1199 | |
94585166 | 1200 | inf->pid = pid; |
ecf45d2c | 1201 | target_follow_exec (inf, exec_file_target); |
6c95b8df PA |
1202 | |
1203 | set_current_inferior (inf); | |
94585166 | 1204 | set_current_program_space (inf->pspace); |
c4c17fb0 | 1205 | add_thread (ptid); |
6c95b8df | 1206 | } |
9107fc8d PA |
1207 | else |
1208 | { | |
1209 | /* The old description may no longer be fit for the new image. | |
1210 | E.g, a 64-bit process exec'ed a 32-bit process. Clear the | |
1211 | old description; we'll read a new one below. No need to do | |
1212 | this on "follow-exec-mode new", as the old inferior stays | |
1213 | around (its description is later cleared/refetched on | |
1214 | restart). */ | |
1215 | target_clear_description (); | |
1216 | } | |
6c95b8df PA |
1217 | |
1218 | gdb_assert (current_program_space == inf->pspace); | |
1219 | ||
ecf45d2c SL |
1220 | /* Attempt to open the exec file. SYMFILE_DEFER_BP_RESET is used |
1221 | because the proper displacement for a PIE (Position Independent | |
1222 | Executable) main symbol file will only be computed by | |
1223 | solib_create_inferior_hook below. breakpoint_re_set would fail | |
1224 | to insert the breakpoints with the zero displacement. */ | |
797bc1cb | 1225 | try_open_exec_file (exec_file_host.get (), inf, SYMFILE_DEFER_BP_RESET); |
c906108c | 1226 | |
9107fc8d PA |
1227 | /* If the target can specify a description, read it. Must do this |
1228 | after flipping to the new executable (because the target supplied | |
1229 | description must be compatible with the executable's | |
1230 | architecture, and the old executable may e.g., be 32-bit, while | |
1231 | the new one 64-bit), and before anything involving memory or | |
1232 | registers. */ | |
1233 | target_find_description (); | |
1234 | ||
268a4a75 | 1235 | solib_create_inferior_hook (0); |
c906108c | 1236 | |
4efc6507 DE |
1237 | jit_inferior_created_hook (); |
1238 | ||
c1e56572 JK |
1239 | breakpoint_re_set (); |
1240 | ||
c906108c SS |
1241 | /* Reinsert all breakpoints. (Those which were symbolic have |
1242 | been reset to the proper address in the new a.out, thanks | |
1777feb0 | 1243 | to symbol_file_command...). */ |
c906108c SS |
1244 | insert_breakpoints (); |
1245 | ||
1246 | /* The next resume of this inferior should bring it to the shlib | |
1247 | startup breakpoints. (If the user had also set bp's on | |
1248 | "main" from the old (parent) process, then they'll auto- | |
1777feb0 | 1249 | matically get reset there in the new process.). */ |
c906108c SS |
1250 | } |
1251 | ||
c2829269 PA |
1252 | /* The queue of threads that need to do a step-over operation to get |
1253 | past e.g., a breakpoint. What technique is used to step over the | |
1254 | breakpoint/watchpoint does not matter -- all threads end up in the | |
1255 | same queue, to maintain rough temporal order of execution, in order | |
1256 | to avoid starvation, otherwise, we could e.g., find ourselves | |
1257 | constantly stepping the same couple threads past their breakpoints | |
1258 | over and over, if the single-step finish fast enough. */ | |
1259 | struct thread_info *step_over_queue_head; | |
1260 | ||
6c4cfb24 PA |
1261 | /* Bit flags indicating what the thread needs to step over. */ |
1262 | ||
8d297bbf | 1263 | enum step_over_what_flag |
6c4cfb24 PA |
1264 | { |
1265 | /* Step over a breakpoint. */ | |
1266 | STEP_OVER_BREAKPOINT = 1, | |
1267 | ||
1268 | /* Step past a non-continuable watchpoint, in order to let the | |
1269 | instruction execute so we can evaluate the watchpoint | |
1270 | expression. */ | |
1271 | STEP_OVER_WATCHPOINT = 2 | |
1272 | }; | |
8d297bbf | 1273 | DEF_ENUM_FLAGS_TYPE (enum step_over_what_flag, step_over_what); |
6c4cfb24 | 1274 | |
963f9c80 | 1275 | /* Info about an instruction that is being stepped over. */ |
31e77af2 PA |
1276 | |
1277 | struct step_over_info | |
1278 | { | |
963f9c80 PA |
1279 | /* If we're stepping past a breakpoint, this is the address space |
1280 | and address of the instruction the breakpoint is set at. We'll | |
1281 | skip inserting all breakpoints here. Valid iff ASPACE is | |
1282 | non-NULL. */ | |
8b86c959 | 1283 | const address_space *aspace; |
31e77af2 | 1284 | CORE_ADDR address; |
963f9c80 PA |
1285 | |
1286 | /* The instruction being stepped over triggers a nonsteppable | |
1287 | watchpoint. If true, we'll skip inserting watchpoints. */ | |
1288 | int nonsteppable_watchpoint_p; | |
21edc42f YQ |
1289 | |
1290 | /* The thread's global number. */ | |
1291 | int thread; | |
31e77af2 PA |
1292 | }; |
1293 | ||
1294 | /* The step-over info of the location that is being stepped over. | |
1295 | ||
1296 | Note that with async/breakpoint always-inserted mode, a user might | |
1297 | set a new breakpoint/watchpoint/etc. exactly while a breakpoint is | |
1298 | being stepped over. As setting a new breakpoint inserts all | |
1299 | breakpoints, we need to make sure the breakpoint being stepped over | |
1300 | isn't inserted then. We do that by only clearing the step-over | |
1301 | info when the step-over is actually finished (or aborted). | |
1302 | ||
1303 | Presently GDB can only step over one breakpoint at any given time. | |
1304 | Given threads that can't run code in the same address space as the | |
1305 | breakpoint's can't really miss the breakpoint, GDB could be taught | |
1306 | to step-over at most one breakpoint per address space (so this info | |
1307 | could move to the address space object if/when GDB is extended). | |
1308 | The set of breakpoints being stepped over will normally be much | |
1309 | smaller than the set of all breakpoints, so a flag in the | |
1310 | breakpoint location structure would be wasteful. A separate list | |
1311 | also saves complexity and run-time, as otherwise we'd have to go | |
1312 | through all breakpoint locations clearing their flag whenever we | |
1313 | start a new sequence. Similar considerations weigh against storing | |
1314 | this info in the thread object. Plus, not all step overs actually | |
1315 | have breakpoint locations -- e.g., stepping past a single-step | |
1316 | breakpoint, or stepping to complete a non-continuable | |
1317 | watchpoint. */ | |
1318 | static struct step_over_info step_over_info; | |
1319 | ||
1320 | /* Record the address of the breakpoint/instruction we're currently | |
ce0db137 DE |
1321 | stepping over. |
1322 | N.B. We record the aspace and address now, instead of say just the thread, | |
1323 | because when we need the info later the thread may be running. */ | |
31e77af2 PA |
1324 | |
1325 | static void | |
8b86c959 | 1326 | set_step_over_info (const address_space *aspace, CORE_ADDR address, |
21edc42f YQ |
1327 | int nonsteppable_watchpoint_p, |
1328 | int thread) | |
31e77af2 PA |
1329 | { |
1330 | step_over_info.aspace = aspace; | |
1331 | step_over_info.address = address; | |
963f9c80 | 1332 | step_over_info.nonsteppable_watchpoint_p = nonsteppable_watchpoint_p; |
21edc42f | 1333 | step_over_info.thread = thread; |
31e77af2 PA |
1334 | } |
1335 | ||
1336 | /* Called when we're not longer stepping over a breakpoint / an | |
1337 | instruction, so all breakpoints are free to be (re)inserted. */ | |
1338 | ||
1339 | static void | |
1340 | clear_step_over_info (void) | |
1341 | { | |
372316f1 PA |
1342 | if (debug_infrun) |
1343 | fprintf_unfiltered (gdb_stdlog, | |
1344 | "infrun: clear_step_over_info\n"); | |
31e77af2 PA |
1345 | step_over_info.aspace = NULL; |
1346 | step_over_info.address = 0; | |
963f9c80 | 1347 | step_over_info.nonsteppable_watchpoint_p = 0; |
21edc42f | 1348 | step_over_info.thread = -1; |
31e77af2 PA |
1349 | } |
1350 | ||
7f89fd65 | 1351 | /* See infrun.h. */ |
31e77af2 PA |
1352 | |
1353 | int | |
1354 | stepping_past_instruction_at (struct address_space *aspace, | |
1355 | CORE_ADDR address) | |
1356 | { | |
1357 | return (step_over_info.aspace != NULL | |
1358 | && breakpoint_address_match (aspace, address, | |
1359 | step_over_info.aspace, | |
1360 | step_over_info.address)); | |
1361 | } | |
1362 | ||
963f9c80 PA |
1363 | /* See infrun.h. */ |
1364 | ||
21edc42f YQ |
1365 | int |
1366 | thread_is_stepping_over_breakpoint (int thread) | |
1367 | { | |
1368 | return (step_over_info.thread != -1 | |
1369 | && thread == step_over_info.thread); | |
1370 | } | |
1371 | ||
1372 | /* See infrun.h. */ | |
1373 | ||
963f9c80 PA |
1374 | int |
1375 | stepping_past_nonsteppable_watchpoint (void) | |
1376 | { | |
1377 | return step_over_info.nonsteppable_watchpoint_p; | |
1378 | } | |
1379 | ||
6cc83d2a PA |
1380 | /* Returns true if step-over info is valid. */ |
1381 | ||
1382 | static int | |
1383 | step_over_info_valid_p (void) | |
1384 | { | |
963f9c80 PA |
1385 | return (step_over_info.aspace != NULL |
1386 | || stepping_past_nonsteppable_watchpoint ()); | |
6cc83d2a PA |
1387 | } |
1388 | ||
c906108c | 1389 | \f |
237fc4c9 PA |
1390 | /* Displaced stepping. */ |
1391 | ||
1392 | /* In non-stop debugging mode, we must take special care to manage | |
1393 | breakpoints properly; in particular, the traditional strategy for | |
1394 | stepping a thread past a breakpoint it has hit is unsuitable. | |
1395 | 'Displaced stepping' is a tactic for stepping one thread past a | |
1396 | breakpoint it has hit while ensuring that other threads running | |
1397 | concurrently will hit the breakpoint as they should. | |
1398 | ||
1399 | The traditional way to step a thread T off a breakpoint in a | |
1400 | multi-threaded program in all-stop mode is as follows: | |
1401 | ||
1402 | a0) Initially, all threads are stopped, and breakpoints are not | |
1403 | inserted. | |
1404 | a1) We single-step T, leaving breakpoints uninserted. | |
1405 | a2) We insert breakpoints, and resume all threads. | |
1406 | ||
1407 | In non-stop debugging, however, this strategy is unsuitable: we | |
1408 | don't want to have to stop all threads in the system in order to | |
1409 | continue or step T past a breakpoint. Instead, we use displaced | |
1410 | stepping: | |
1411 | ||
1412 | n0) Initially, T is stopped, other threads are running, and | |
1413 | breakpoints are inserted. | |
1414 | n1) We copy the instruction "under" the breakpoint to a separate | |
1415 | location, outside the main code stream, making any adjustments | |
1416 | to the instruction, register, and memory state as directed by | |
1417 | T's architecture. | |
1418 | n2) We single-step T over the instruction at its new location. | |
1419 | n3) We adjust the resulting register and memory state as directed | |
1420 | by T's architecture. This includes resetting T's PC to point | |
1421 | back into the main instruction stream. | |
1422 | n4) We resume T. | |
1423 | ||
1424 | This approach depends on the following gdbarch methods: | |
1425 | ||
1426 | - gdbarch_max_insn_length and gdbarch_displaced_step_location | |
1427 | indicate where to copy the instruction, and how much space must | |
1428 | be reserved there. We use these in step n1. | |
1429 | ||
1430 | - gdbarch_displaced_step_copy_insn copies a instruction to a new | |
1431 | address, and makes any necessary adjustments to the instruction, | |
1432 | register contents, and memory. We use this in step n1. | |
1433 | ||
1434 | - gdbarch_displaced_step_fixup adjusts registers and memory after | |
1435 | we have successfuly single-stepped the instruction, to yield the | |
1436 | same effect the instruction would have had if we had executed it | |
1437 | at its original address. We use this in step n3. | |
1438 | ||
237fc4c9 PA |
1439 | The gdbarch_displaced_step_copy_insn and |
1440 | gdbarch_displaced_step_fixup functions must be written so that | |
1441 | copying an instruction with gdbarch_displaced_step_copy_insn, | |
1442 | single-stepping across the copied instruction, and then applying | |
1443 | gdbarch_displaced_insn_fixup should have the same effects on the | |
1444 | thread's memory and registers as stepping the instruction in place | |
1445 | would have. Exactly which responsibilities fall to the copy and | |
1446 | which fall to the fixup is up to the author of those functions. | |
1447 | ||
1448 | See the comments in gdbarch.sh for details. | |
1449 | ||
1450 | Note that displaced stepping and software single-step cannot | |
1451 | currently be used in combination, although with some care I think | |
1452 | they could be made to. Software single-step works by placing | |
1453 | breakpoints on all possible subsequent instructions; if the | |
1454 | displaced instruction is a PC-relative jump, those breakpoints | |
1455 | could fall in very strange places --- on pages that aren't | |
1456 | executable, or at addresses that are not proper instruction | |
1457 | boundaries. (We do generally let other threads run while we wait | |
1458 | to hit the software single-step breakpoint, and they might | |
1459 | encounter such a corrupted instruction.) One way to work around | |
1460 | this would be to have gdbarch_displaced_step_copy_insn fully | |
1461 | simulate the effect of PC-relative instructions (and return NULL) | |
1462 | on architectures that use software single-stepping. | |
1463 | ||
1464 | In non-stop mode, we can have independent and simultaneous step | |
1465 | requests, so more than one thread may need to simultaneously step | |
1466 | over a breakpoint. The current implementation assumes there is | |
1467 | only one scratch space per process. In this case, we have to | |
1468 | serialize access to the scratch space. If thread A wants to step | |
1469 | over a breakpoint, but we are currently waiting for some other | |
1470 | thread to complete a displaced step, we leave thread A stopped and | |
1471 | place it in the displaced_step_request_queue. Whenever a displaced | |
1472 | step finishes, we pick the next thread in the queue and start a new | |
1473 | displaced step operation on it. See displaced_step_prepare and | |
1474 | displaced_step_fixup for details. */ | |
1475 | ||
cfba9872 SM |
1476 | /* Default destructor for displaced_step_closure. */ |
1477 | ||
1478 | displaced_step_closure::~displaced_step_closure () = default; | |
1479 | ||
fc1cf338 PA |
1480 | /* Get the displaced stepping state of process PID. */ |
1481 | ||
39a36629 | 1482 | static displaced_step_inferior_state * |
00431a78 | 1483 | get_displaced_stepping_state (inferior *inf) |
fc1cf338 | 1484 | { |
d20172fc | 1485 | return &inf->displaced_step_state; |
fc1cf338 PA |
1486 | } |
1487 | ||
372316f1 PA |
1488 | /* Returns true if any inferior has a thread doing a displaced |
1489 | step. */ | |
1490 | ||
39a36629 SM |
1491 | static bool |
1492 | displaced_step_in_progress_any_inferior () | |
372316f1 | 1493 | { |
d20172fc | 1494 | for (inferior *i : all_inferiors ()) |
39a36629 | 1495 | { |
d20172fc | 1496 | if (i->displaced_step_state.step_thread != nullptr) |
39a36629 SM |
1497 | return true; |
1498 | } | |
372316f1 | 1499 | |
39a36629 | 1500 | return false; |
372316f1 PA |
1501 | } |
1502 | ||
c0987663 YQ |
1503 | /* Return true if thread represented by PTID is doing a displaced |
1504 | step. */ | |
1505 | ||
1506 | static int | |
00431a78 | 1507 | displaced_step_in_progress_thread (thread_info *thread) |
c0987663 | 1508 | { |
00431a78 | 1509 | gdb_assert (thread != NULL); |
c0987663 | 1510 | |
d20172fc | 1511 | return get_displaced_stepping_state (thread->inf)->step_thread == thread; |
c0987663 YQ |
1512 | } |
1513 | ||
8f572e5c PA |
1514 | /* Return true if process PID has a thread doing a displaced step. */ |
1515 | ||
1516 | static int | |
00431a78 | 1517 | displaced_step_in_progress (inferior *inf) |
8f572e5c | 1518 | { |
d20172fc | 1519 | return get_displaced_stepping_state (inf)->step_thread != nullptr; |
fc1cf338 PA |
1520 | } |
1521 | ||
a42244db YQ |
1522 | /* If inferior is in displaced stepping, and ADDR equals to starting address |
1523 | of copy area, return corresponding displaced_step_closure. Otherwise, | |
1524 | return NULL. */ | |
1525 | ||
1526 | struct displaced_step_closure* | |
1527 | get_displaced_step_closure_by_addr (CORE_ADDR addr) | |
1528 | { | |
d20172fc | 1529 | displaced_step_inferior_state *displaced |
00431a78 | 1530 | = get_displaced_stepping_state (current_inferior ()); |
a42244db YQ |
1531 | |
1532 | /* If checking the mode of displaced instruction in copy area. */ | |
d20172fc | 1533 | if (displaced->step_thread != nullptr |
00431a78 | 1534 | && displaced->step_copy == addr) |
a42244db YQ |
1535 | return displaced->step_closure; |
1536 | ||
1537 | return NULL; | |
1538 | } | |
1539 | ||
fc1cf338 PA |
1540 | static void |
1541 | infrun_inferior_exit (struct inferior *inf) | |
1542 | { | |
d20172fc | 1543 | inf->displaced_step_state.reset (); |
fc1cf338 | 1544 | } |
237fc4c9 | 1545 | |
fff08868 HZ |
1546 | /* If ON, and the architecture supports it, GDB will use displaced |
1547 | stepping to step over breakpoints. If OFF, or if the architecture | |
1548 | doesn't support it, GDB will instead use the traditional | |
1549 | hold-and-step approach. If AUTO (which is the default), GDB will | |
1550 | decide which technique to use to step over breakpoints depending on | |
1551 | which of all-stop or non-stop mode is active --- displaced stepping | |
1552 | in non-stop mode; hold-and-step in all-stop mode. */ | |
1553 | ||
72d0e2c5 | 1554 | static enum auto_boolean can_use_displaced_stepping = AUTO_BOOLEAN_AUTO; |
fff08868 | 1555 | |
237fc4c9 PA |
1556 | static void |
1557 | show_can_use_displaced_stepping (struct ui_file *file, int from_tty, | |
1558 | struct cmd_list_element *c, | |
1559 | const char *value) | |
1560 | { | |
72d0e2c5 | 1561 | if (can_use_displaced_stepping == AUTO_BOOLEAN_AUTO) |
3e43a32a MS |
1562 | fprintf_filtered (file, |
1563 | _("Debugger's willingness to use displaced stepping " | |
1564 | "to step over breakpoints is %s (currently %s).\n"), | |
fbea99ea | 1565 | value, target_is_non_stop_p () ? "on" : "off"); |
fff08868 | 1566 | else |
3e43a32a MS |
1567 | fprintf_filtered (file, |
1568 | _("Debugger's willingness to use displaced stepping " | |
1569 | "to step over breakpoints is %s.\n"), value); | |
237fc4c9 PA |
1570 | } |
1571 | ||
fff08868 | 1572 | /* Return non-zero if displaced stepping can/should be used to step |
3fc8eb30 | 1573 | over breakpoints of thread TP. */ |
fff08868 | 1574 | |
237fc4c9 | 1575 | static int |
3fc8eb30 | 1576 | use_displaced_stepping (struct thread_info *tp) |
237fc4c9 | 1577 | { |
00431a78 | 1578 | struct regcache *regcache = get_thread_regcache (tp); |
ac7936df | 1579 | struct gdbarch *gdbarch = regcache->arch (); |
d20172fc SM |
1580 | displaced_step_inferior_state *displaced_state |
1581 | = get_displaced_stepping_state (tp->inf); | |
3fc8eb30 | 1582 | |
fbea99ea PA |
1583 | return (((can_use_displaced_stepping == AUTO_BOOLEAN_AUTO |
1584 | && target_is_non_stop_p ()) | |
72d0e2c5 | 1585 | || can_use_displaced_stepping == AUTO_BOOLEAN_TRUE) |
96429cc8 | 1586 | && gdbarch_displaced_step_copy_insn_p (gdbarch) |
3fc8eb30 | 1587 | && find_record_target () == NULL |
d20172fc | 1588 | && !displaced_state->failed_before); |
237fc4c9 PA |
1589 | } |
1590 | ||
1591 | /* Clean out any stray displaced stepping state. */ | |
1592 | static void | |
fc1cf338 | 1593 | displaced_step_clear (struct displaced_step_inferior_state *displaced) |
237fc4c9 PA |
1594 | { |
1595 | /* Indicate that there is no cleanup pending. */ | |
00431a78 | 1596 | displaced->step_thread = nullptr; |
237fc4c9 | 1597 | |
cfba9872 | 1598 | delete displaced->step_closure; |
6d45d4b4 | 1599 | displaced->step_closure = NULL; |
237fc4c9 PA |
1600 | } |
1601 | ||
1602 | static void | |
fc1cf338 | 1603 | displaced_step_clear_cleanup (void *arg) |
237fc4c9 | 1604 | { |
9a3c8263 SM |
1605 | struct displaced_step_inferior_state *state |
1606 | = (struct displaced_step_inferior_state *) arg; | |
fc1cf338 PA |
1607 | |
1608 | displaced_step_clear (state); | |
237fc4c9 PA |
1609 | } |
1610 | ||
1611 | /* Dump LEN bytes at BUF in hex to FILE, followed by a newline. */ | |
1612 | void | |
1613 | displaced_step_dump_bytes (struct ui_file *file, | |
1614 | const gdb_byte *buf, | |
1615 | size_t len) | |
1616 | { | |
1617 | int i; | |
1618 | ||
1619 | for (i = 0; i < len; i++) | |
1620 | fprintf_unfiltered (file, "%02x ", buf[i]); | |
1621 | fputs_unfiltered ("\n", file); | |
1622 | } | |
1623 | ||
1624 | /* Prepare to single-step, using displaced stepping. | |
1625 | ||
1626 | Note that we cannot use displaced stepping when we have a signal to | |
1627 | deliver. If we have a signal to deliver and an instruction to step | |
1628 | over, then after the step, there will be no indication from the | |
1629 | target whether the thread entered a signal handler or ignored the | |
1630 | signal and stepped over the instruction successfully --- both cases | |
1631 | result in a simple SIGTRAP. In the first case we mustn't do a | |
1632 | fixup, and in the second case we must --- but we can't tell which. | |
1633 | Comments in the code for 'random signals' in handle_inferior_event | |
1634 | explain how we handle this case instead. | |
1635 | ||
1636 | Returns 1 if preparing was successful -- this thread is going to be | |
7f03bd92 PA |
1637 | stepped now; 0 if displaced stepping this thread got queued; or -1 |
1638 | if this instruction can't be displaced stepped. */ | |
1639 | ||
237fc4c9 | 1640 | static int |
00431a78 | 1641 | displaced_step_prepare_throw (thread_info *tp) |
237fc4c9 | 1642 | { |
00431a78 | 1643 | regcache *regcache = get_thread_regcache (tp); |
ac7936df | 1644 | struct gdbarch *gdbarch = regcache->arch (); |
8b86c959 | 1645 | const address_space *aspace = regcache->aspace (); |
237fc4c9 PA |
1646 | CORE_ADDR original, copy; |
1647 | ULONGEST len; | |
1648 | struct displaced_step_closure *closure; | |
9e529e1d | 1649 | int status; |
237fc4c9 PA |
1650 | |
1651 | /* We should never reach this function if the architecture does not | |
1652 | support displaced stepping. */ | |
1653 | gdb_assert (gdbarch_displaced_step_copy_insn_p (gdbarch)); | |
1654 | ||
c2829269 PA |
1655 | /* Nor if the thread isn't meant to step over a breakpoint. */ |
1656 | gdb_assert (tp->control.trap_expected); | |
1657 | ||
c1e36e3e PA |
1658 | /* Disable range stepping while executing in the scratch pad. We |
1659 | want a single-step even if executing the displaced instruction in | |
1660 | the scratch buffer lands within the stepping range (e.g., a | |
1661 | jump/branch). */ | |
1662 | tp->control.may_range_step = 0; | |
1663 | ||
fc1cf338 PA |
1664 | /* We have to displaced step one thread at a time, as we only have |
1665 | access to a single scratch space per inferior. */ | |
237fc4c9 | 1666 | |
d20172fc SM |
1667 | displaced_step_inferior_state *displaced |
1668 | = get_displaced_stepping_state (tp->inf); | |
fc1cf338 | 1669 | |
00431a78 | 1670 | if (displaced->step_thread != nullptr) |
237fc4c9 PA |
1671 | { |
1672 | /* Already waiting for a displaced step to finish. Defer this | |
1673 | request and place in queue. */ | |
237fc4c9 PA |
1674 | |
1675 | if (debug_displaced) | |
1676 | fprintf_unfiltered (gdb_stdlog, | |
c2829269 | 1677 | "displaced: deferring step of %s\n", |
00431a78 | 1678 | target_pid_to_str (tp->ptid)); |
237fc4c9 | 1679 | |
c2829269 | 1680 | thread_step_over_chain_enqueue (tp); |
237fc4c9 PA |
1681 | return 0; |
1682 | } | |
1683 | else | |
1684 | { | |
1685 | if (debug_displaced) | |
1686 | fprintf_unfiltered (gdb_stdlog, | |
1687 | "displaced: stepping %s now\n", | |
00431a78 | 1688 | target_pid_to_str (tp->ptid)); |
237fc4c9 PA |
1689 | } |
1690 | ||
fc1cf338 | 1691 | displaced_step_clear (displaced); |
237fc4c9 | 1692 | |
00431a78 PA |
1693 | scoped_restore_current_thread restore_thread; |
1694 | ||
1695 | switch_to_thread (tp); | |
ad53cd71 | 1696 | |
515630c5 | 1697 | original = regcache_read_pc (regcache); |
237fc4c9 PA |
1698 | |
1699 | copy = gdbarch_displaced_step_location (gdbarch); | |
1700 | len = gdbarch_max_insn_length (gdbarch); | |
1701 | ||
d35ae833 PA |
1702 | if (breakpoint_in_range_p (aspace, copy, len)) |
1703 | { | |
1704 | /* There's a breakpoint set in the scratch pad location range | |
1705 | (which is usually around the entry point). We'd either | |
1706 | install it before resuming, which would overwrite/corrupt the | |
1707 | scratch pad, or if it was already inserted, this displaced | |
1708 | step would overwrite it. The latter is OK in the sense that | |
1709 | we already assume that no thread is going to execute the code | |
1710 | in the scratch pad range (after initial startup) anyway, but | |
1711 | the former is unacceptable. Simply punt and fallback to | |
1712 | stepping over this breakpoint in-line. */ | |
1713 | if (debug_displaced) | |
1714 | { | |
1715 | fprintf_unfiltered (gdb_stdlog, | |
1716 | "displaced: breakpoint set in scratch pad. " | |
1717 | "Stepping over breakpoint in-line instead.\n"); | |
1718 | } | |
1719 | ||
d35ae833 PA |
1720 | return -1; |
1721 | } | |
1722 | ||
237fc4c9 | 1723 | /* Save the original contents of the copy area. */ |
d20172fc SM |
1724 | displaced->step_saved_copy.resize (len); |
1725 | status = target_read_memory (copy, displaced->step_saved_copy.data (), len); | |
9e529e1d JK |
1726 | if (status != 0) |
1727 | throw_error (MEMORY_ERROR, | |
1728 | _("Error accessing memory address %s (%s) for " | |
1729 | "displaced-stepping scratch space."), | |
1730 | paddress (gdbarch, copy), safe_strerror (status)); | |
237fc4c9 PA |
1731 | if (debug_displaced) |
1732 | { | |
5af949e3 UW |
1733 | fprintf_unfiltered (gdb_stdlog, "displaced: saved %s: ", |
1734 | paddress (gdbarch, copy)); | |
fc1cf338 | 1735 | displaced_step_dump_bytes (gdb_stdlog, |
d20172fc | 1736 | displaced->step_saved_copy.data (), |
fc1cf338 | 1737 | len); |
237fc4c9 PA |
1738 | }; |
1739 | ||
1740 | closure = gdbarch_displaced_step_copy_insn (gdbarch, | |
ad53cd71 | 1741 | original, copy, regcache); |
7f03bd92 PA |
1742 | if (closure == NULL) |
1743 | { | |
1744 | /* The architecture doesn't know how or want to displaced step | |
1745 | this instruction or instruction sequence. Fallback to | |
1746 | stepping over the breakpoint in-line. */ | |
7f03bd92 PA |
1747 | return -1; |
1748 | } | |
237fc4c9 | 1749 | |
9f5a595d UW |
1750 | /* Save the information we need to fix things up if the step |
1751 | succeeds. */ | |
00431a78 | 1752 | displaced->step_thread = tp; |
fc1cf338 PA |
1753 | displaced->step_gdbarch = gdbarch; |
1754 | displaced->step_closure = closure; | |
1755 | displaced->step_original = original; | |
1756 | displaced->step_copy = copy; | |
9f5a595d | 1757 | |
d20172fc SM |
1758 | cleanup *ignore_cleanups |
1759 | = make_cleanup (displaced_step_clear_cleanup, displaced); | |
237fc4c9 PA |
1760 | |
1761 | /* Resume execution at the copy. */ | |
515630c5 | 1762 | regcache_write_pc (regcache, copy); |
237fc4c9 | 1763 | |
ad53cd71 PA |
1764 | discard_cleanups (ignore_cleanups); |
1765 | ||
237fc4c9 | 1766 | if (debug_displaced) |
5af949e3 UW |
1767 | fprintf_unfiltered (gdb_stdlog, "displaced: displaced pc to %s\n", |
1768 | paddress (gdbarch, copy)); | |
237fc4c9 | 1769 | |
237fc4c9 PA |
1770 | return 1; |
1771 | } | |
1772 | ||
3fc8eb30 PA |
1773 | /* Wrapper for displaced_step_prepare_throw that disabled further |
1774 | attempts at displaced stepping if we get a memory error. */ | |
1775 | ||
1776 | static int | |
00431a78 | 1777 | displaced_step_prepare (thread_info *thread) |
3fc8eb30 PA |
1778 | { |
1779 | int prepared = -1; | |
1780 | ||
1781 | TRY | |
1782 | { | |
00431a78 | 1783 | prepared = displaced_step_prepare_throw (thread); |
3fc8eb30 PA |
1784 | } |
1785 | CATCH (ex, RETURN_MASK_ERROR) | |
1786 | { | |
1787 | struct displaced_step_inferior_state *displaced_state; | |
1788 | ||
16b41842 PA |
1789 | if (ex.error != MEMORY_ERROR |
1790 | && ex.error != NOT_SUPPORTED_ERROR) | |
3fc8eb30 PA |
1791 | throw_exception (ex); |
1792 | ||
1793 | if (debug_infrun) | |
1794 | { | |
1795 | fprintf_unfiltered (gdb_stdlog, | |
1796 | "infrun: disabling displaced stepping: %s\n", | |
1797 | ex.message); | |
1798 | } | |
1799 | ||
1800 | /* Be verbose if "set displaced-stepping" is "on", silent if | |
1801 | "auto". */ | |
1802 | if (can_use_displaced_stepping == AUTO_BOOLEAN_TRUE) | |
1803 | { | |
fd7dcb94 | 1804 | warning (_("disabling displaced stepping: %s"), |
3fc8eb30 PA |
1805 | ex.message); |
1806 | } | |
1807 | ||
1808 | /* Disable further displaced stepping attempts. */ | |
1809 | displaced_state | |
00431a78 | 1810 | = get_displaced_stepping_state (thread->inf); |
3fc8eb30 PA |
1811 | displaced_state->failed_before = 1; |
1812 | } | |
1813 | END_CATCH | |
1814 | ||
1815 | return prepared; | |
1816 | } | |
1817 | ||
237fc4c9 | 1818 | static void |
3e43a32a MS |
1819 | write_memory_ptid (ptid_t ptid, CORE_ADDR memaddr, |
1820 | const gdb_byte *myaddr, int len) | |
237fc4c9 | 1821 | { |
2989a365 | 1822 | scoped_restore save_inferior_ptid = make_scoped_restore (&inferior_ptid); |
abbb1732 | 1823 | |
237fc4c9 PA |
1824 | inferior_ptid = ptid; |
1825 | write_memory (memaddr, myaddr, len); | |
237fc4c9 PA |
1826 | } |
1827 | ||
e2d96639 YQ |
1828 | /* Restore the contents of the copy area for thread PTID. */ |
1829 | ||
1830 | static void | |
1831 | displaced_step_restore (struct displaced_step_inferior_state *displaced, | |
1832 | ptid_t ptid) | |
1833 | { | |
1834 | ULONGEST len = gdbarch_max_insn_length (displaced->step_gdbarch); | |
1835 | ||
1836 | write_memory_ptid (ptid, displaced->step_copy, | |
d20172fc | 1837 | displaced->step_saved_copy.data (), len); |
e2d96639 YQ |
1838 | if (debug_displaced) |
1839 | fprintf_unfiltered (gdb_stdlog, "displaced: restored %s %s\n", | |
1840 | target_pid_to_str (ptid), | |
1841 | paddress (displaced->step_gdbarch, | |
1842 | displaced->step_copy)); | |
1843 | } | |
1844 | ||
372316f1 PA |
1845 | /* If we displaced stepped an instruction successfully, adjust |
1846 | registers and memory to yield the same effect the instruction would | |
1847 | have had if we had executed it at its original address, and return | |
1848 | 1. If the instruction didn't complete, relocate the PC and return | |
1849 | -1. If the thread wasn't displaced stepping, return 0. */ | |
1850 | ||
1851 | static int | |
00431a78 | 1852 | displaced_step_fixup (thread_info *event_thread, enum gdb_signal signal) |
237fc4c9 PA |
1853 | { |
1854 | struct cleanup *old_cleanups; | |
fc1cf338 | 1855 | struct displaced_step_inferior_state *displaced |
00431a78 | 1856 | = get_displaced_stepping_state (event_thread->inf); |
372316f1 | 1857 | int ret; |
fc1cf338 | 1858 | |
00431a78 PA |
1859 | /* Was this event for the thread we displaced? */ |
1860 | if (displaced->step_thread != event_thread) | |
372316f1 | 1861 | return 0; |
237fc4c9 | 1862 | |
fc1cf338 | 1863 | old_cleanups = make_cleanup (displaced_step_clear_cleanup, displaced); |
237fc4c9 | 1864 | |
00431a78 | 1865 | displaced_step_restore (displaced, displaced->step_thread->ptid); |
237fc4c9 | 1866 | |
cb71640d PA |
1867 | /* Fixup may need to read memory/registers. Switch to the thread |
1868 | that we're fixing up. Also, target_stopped_by_watchpoint checks | |
1869 | the current thread. */ | |
00431a78 | 1870 | switch_to_thread (event_thread); |
cb71640d | 1871 | |
237fc4c9 | 1872 | /* Did the instruction complete successfully? */ |
cb71640d PA |
1873 | if (signal == GDB_SIGNAL_TRAP |
1874 | && !(target_stopped_by_watchpoint () | |
1875 | && (gdbarch_have_nonsteppable_watchpoint (displaced->step_gdbarch) | |
1876 | || target_have_steppable_watchpoint))) | |
237fc4c9 PA |
1877 | { |
1878 | /* Fix up the resulting state. */ | |
fc1cf338 PA |
1879 | gdbarch_displaced_step_fixup (displaced->step_gdbarch, |
1880 | displaced->step_closure, | |
1881 | displaced->step_original, | |
1882 | displaced->step_copy, | |
00431a78 | 1883 | get_thread_regcache (displaced->step_thread)); |
372316f1 | 1884 | ret = 1; |
237fc4c9 PA |
1885 | } |
1886 | else | |
1887 | { | |
1888 | /* Since the instruction didn't complete, all we can do is | |
1889 | relocate the PC. */ | |
00431a78 | 1890 | struct regcache *regcache = get_thread_regcache (event_thread); |
515630c5 | 1891 | CORE_ADDR pc = regcache_read_pc (regcache); |
abbb1732 | 1892 | |
fc1cf338 | 1893 | pc = displaced->step_original + (pc - displaced->step_copy); |
515630c5 | 1894 | regcache_write_pc (regcache, pc); |
372316f1 | 1895 | ret = -1; |
237fc4c9 PA |
1896 | } |
1897 | ||
1898 | do_cleanups (old_cleanups); | |
1899 | ||
00431a78 | 1900 | displaced->step_thread = nullptr; |
372316f1 PA |
1901 | |
1902 | return ret; | |
c2829269 | 1903 | } |
1c5cfe86 | 1904 | |
4d9d9d04 PA |
1905 | /* Data to be passed around while handling an event. This data is |
1906 | discarded between events. */ | |
1907 | struct execution_control_state | |
1908 | { | |
1909 | ptid_t ptid; | |
1910 | /* The thread that got the event, if this was a thread event; NULL | |
1911 | otherwise. */ | |
1912 | struct thread_info *event_thread; | |
1913 | ||
1914 | struct target_waitstatus ws; | |
1915 | int stop_func_filled_in; | |
1916 | CORE_ADDR stop_func_start; | |
1917 | CORE_ADDR stop_func_end; | |
1918 | const char *stop_func_name; | |
1919 | int wait_some_more; | |
1920 | ||
1921 | /* True if the event thread hit the single-step breakpoint of | |
1922 | another thread. Thus the event doesn't cause a stop, the thread | |
1923 | needs to be single-stepped past the single-step breakpoint before | |
1924 | we can switch back to the original stepping thread. */ | |
1925 | int hit_singlestep_breakpoint; | |
1926 | }; | |
1927 | ||
1928 | /* Clear ECS and set it to point at TP. */ | |
c2829269 PA |
1929 | |
1930 | static void | |
4d9d9d04 PA |
1931 | reset_ecs (struct execution_control_state *ecs, struct thread_info *tp) |
1932 | { | |
1933 | memset (ecs, 0, sizeof (*ecs)); | |
1934 | ecs->event_thread = tp; | |
1935 | ecs->ptid = tp->ptid; | |
1936 | } | |
1937 | ||
1938 | static void keep_going_pass_signal (struct execution_control_state *ecs); | |
1939 | static void prepare_to_wait (struct execution_control_state *ecs); | |
2ac7589c | 1940 | static int keep_going_stepped_thread (struct thread_info *tp); |
8d297bbf | 1941 | static step_over_what thread_still_needs_step_over (struct thread_info *tp); |
4d9d9d04 PA |
1942 | |
1943 | /* Are there any pending step-over requests? If so, run all we can | |
1944 | now and return true. Otherwise, return false. */ | |
1945 | ||
1946 | static int | |
c2829269 PA |
1947 | start_step_over (void) |
1948 | { | |
1949 | struct thread_info *tp, *next; | |
1950 | ||
372316f1 PA |
1951 | /* Don't start a new step-over if we already have an in-line |
1952 | step-over operation ongoing. */ | |
1953 | if (step_over_info_valid_p ()) | |
1954 | return 0; | |
1955 | ||
c2829269 | 1956 | for (tp = step_over_queue_head; tp != NULL; tp = next) |
237fc4c9 | 1957 | { |
4d9d9d04 PA |
1958 | struct execution_control_state ecss; |
1959 | struct execution_control_state *ecs = &ecss; | |
8d297bbf | 1960 | step_over_what step_what; |
372316f1 | 1961 | int must_be_in_line; |
c2829269 | 1962 | |
c65d6b55 PA |
1963 | gdb_assert (!tp->stop_requested); |
1964 | ||
c2829269 | 1965 | next = thread_step_over_chain_next (tp); |
237fc4c9 | 1966 | |
c2829269 PA |
1967 | /* If this inferior already has a displaced step in process, |
1968 | don't start a new one. */ | |
00431a78 | 1969 | if (displaced_step_in_progress (tp->inf)) |
c2829269 PA |
1970 | continue; |
1971 | ||
372316f1 PA |
1972 | step_what = thread_still_needs_step_over (tp); |
1973 | must_be_in_line = ((step_what & STEP_OVER_WATCHPOINT) | |
1974 | || ((step_what & STEP_OVER_BREAKPOINT) | |
3fc8eb30 | 1975 | && !use_displaced_stepping (tp))); |
372316f1 PA |
1976 | |
1977 | /* We currently stop all threads of all processes to step-over | |
1978 | in-line. If we need to start a new in-line step-over, let | |
1979 | any pending displaced steps finish first. */ | |
1980 | if (must_be_in_line && displaced_step_in_progress_any_inferior ()) | |
1981 | return 0; | |
1982 | ||
c2829269 PA |
1983 | thread_step_over_chain_remove (tp); |
1984 | ||
1985 | if (step_over_queue_head == NULL) | |
1986 | { | |
1987 | if (debug_infrun) | |
1988 | fprintf_unfiltered (gdb_stdlog, | |
1989 | "infrun: step-over queue now empty\n"); | |
1990 | } | |
1991 | ||
372316f1 PA |
1992 | if (tp->control.trap_expected |
1993 | || tp->resumed | |
1994 | || tp->executing) | |
ad53cd71 | 1995 | { |
4d9d9d04 PA |
1996 | internal_error (__FILE__, __LINE__, |
1997 | "[%s] has inconsistent state: " | |
372316f1 | 1998 | "trap_expected=%d, resumed=%d, executing=%d\n", |
4d9d9d04 PA |
1999 | target_pid_to_str (tp->ptid), |
2000 | tp->control.trap_expected, | |
372316f1 | 2001 | tp->resumed, |
4d9d9d04 | 2002 | tp->executing); |
ad53cd71 | 2003 | } |
1c5cfe86 | 2004 | |
4d9d9d04 PA |
2005 | if (debug_infrun) |
2006 | fprintf_unfiltered (gdb_stdlog, | |
2007 | "infrun: resuming [%s] for step-over\n", | |
2008 | target_pid_to_str (tp->ptid)); | |
2009 | ||
2010 | /* keep_going_pass_signal skips the step-over if the breakpoint | |
2011 | is no longer inserted. In all-stop, we want to keep looking | |
2012 | for a thread that needs a step-over instead of resuming TP, | |
2013 | because we wouldn't be able to resume anything else until the | |
2014 | target stops again. In non-stop, the resume always resumes | |
2015 | only TP, so it's OK to let the thread resume freely. */ | |
fbea99ea | 2016 | if (!target_is_non_stop_p () && !step_what) |
4d9d9d04 | 2017 | continue; |
8550d3b3 | 2018 | |
00431a78 | 2019 | switch_to_thread (tp); |
4d9d9d04 PA |
2020 | reset_ecs (ecs, tp); |
2021 | keep_going_pass_signal (ecs); | |
1c5cfe86 | 2022 | |
4d9d9d04 PA |
2023 | if (!ecs->wait_some_more) |
2024 | error (_("Command aborted.")); | |
1c5cfe86 | 2025 | |
372316f1 PA |
2026 | gdb_assert (tp->resumed); |
2027 | ||
2028 | /* If we started a new in-line step-over, we're done. */ | |
2029 | if (step_over_info_valid_p ()) | |
2030 | { | |
2031 | gdb_assert (tp->control.trap_expected); | |
2032 | return 1; | |
2033 | } | |
2034 | ||
fbea99ea | 2035 | if (!target_is_non_stop_p ()) |
4d9d9d04 PA |
2036 | { |
2037 | /* On all-stop, shouldn't have resumed unless we needed a | |
2038 | step over. */ | |
2039 | gdb_assert (tp->control.trap_expected | |
2040 | || tp->step_after_step_resume_breakpoint); | |
2041 | ||
2042 | /* With remote targets (at least), in all-stop, we can't | |
2043 | issue any further remote commands until the program stops | |
2044 | again. */ | |
2045 | return 1; | |
1c5cfe86 | 2046 | } |
c2829269 | 2047 | |
4d9d9d04 PA |
2048 | /* Either the thread no longer needed a step-over, or a new |
2049 | displaced stepping sequence started. Even in the latter | |
2050 | case, continue looking. Maybe we can also start another | |
2051 | displaced step on a thread of other process. */ | |
237fc4c9 | 2052 | } |
4d9d9d04 PA |
2053 | |
2054 | return 0; | |
237fc4c9 PA |
2055 | } |
2056 | ||
5231c1fd PA |
2057 | /* Update global variables holding ptids to hold NEW_PTID if they were |
2058 | holding OLD_PTID. */ | |
2059 | static void | |
2060 | infrun_thread_ptid_changed (ptid_t old_ptid, ptid_t new_ptid) | |
2061 | { | |
d7e15655 | 2062 | if (inferior_ptid == old_ptid) |
5231c1fd | 2063 | inferior_ptid = new_ptid; |
5231c1fd PA |
2064 | } |
2065 | ||
237fc4c9 | 2066 | \f |
c906108c | 2067 | |
53904c9e AC |
2068 | static const char schedlock_off[] = "off"; |
2069 | static const char schedlock_on[] = "on"; | |
2070 | static const char schedlock_step[] = "step"; | |
f2665db5 | 2071 | static const char schedlock_replay[] = "replay"; |
40478521 | 2072 | static const char *const scheduler_enums[] = { |
ef346e04 AC |
2073 | schedlock_off, |
2074 | schedlock_on, | |
2075 | schedlock_step, | |
f2665db5 | 2076 | schedlock_replay, |
ef346e04 AC |
2077 | NULL |
2078 | }; | |
f2665db5 | 2079 | static const char *scheduler_mode = schedlock_replay; |
920d2a44 AC |
2080 | static void |
2081 | show_scheduler_mode (struct ui_file *file, int from_tty, | |
2082 | struct cmd_list_element *c, const char *value) | |
2083 | { | |
3e43a32a MS |
2084 | fprintf_filtered (file, |
2085 | _("Mode for locking scheduler " | |
2086 | "during execution is \"%s\".\n"), | |
920d2a44 AC |
2087 | value); |
2088 | } | |
c906108c SS |
2089 | |
2090 | static void | |
eb4c3f4a | 2091 | set_schedlock_func (const char *args, int from_tty, struct cmd_list_element *c) |
c906108c | 2092 | { |
eefe576e AC |
2093 | if (!target_can_lock_scheduler) |
2094 | { | |
2095 | scheduler_mode = schedlock_off; | |
2096 | error (_("Target '%s' cannot support this command."), target_shortname); | |
2097 | } | |
c906108c SS |
2098 | } |
2099 | ||
d4db2f36 PA |
2100 | /* True if execution commands resume all threads of all processes by |
2101 | default; otherwise, resume only threads of the current inferior | |
2102 | process. */ | |
2103 | int sched_multi = 0; | |
2104 | ||
2facfe5c DD |
2105 | /* Try to setup for software single stepping over the specified location. |
2106 | Return 1 if target_resume() should use hardware single step. | |
2107 | ||
2108 | GDBARCH the current gdbarch. | |
2109 | PC the location to step over. */ | |
2110 | ||
2111 | static int | |
2112 | maybe_software_singlestep (struct gdbarch *gdbarch, CORE_ADDR pc) | |
2113 | { | |
2114 | int hw_step = 1; | |
2115 | ||
f02253f1 | 2116 | if (execution_direction == EXEC_FORWARD |
93f9a11f YQ |
2117 | && gdbarch_software_single_step_p (gdbarch)) |
2118 | hw_step = !insert_single_step_breakpoints (gdbarch); | |
2119 | ||
2facfe5c DD |
2120 | return hw_step; |
2121 | } | |
c906108c | 2122 | |
f3263aa4 PA |
2123 | /* See infrun.h. */ |
2124 | ||
09cee04b PA |
2125 | ptid_t |
2126 | user_visible_resume_ptid (int step) | |
2127 | { | |
f3263aa4 | 2128 | ptid_t resume_ptid; |
09cee04b | 2129 | |
09cee04b PA |
2130 | if (non_stop) |
2131 | { | |
2132 | /* With non-stop mode on, threads are always handled | |
2133 | individually. */ | |
2134 | resume_ptid = inferior_ptid; | |
2135 | } | |
2136 | else if ((scheduler_mode == schedlock_on) | |
03d46957 | 2137 | || (scheduler_mode == schedlock_step && step)) |
09cee04b | 2138 | { |
f3263aa4 PA |
2139 | /* User-settable 'scheduler' mode requires solo thread |
2140 | resume. */ | |
09cee04b PA |
2141 | resume_ptid = inferior_ptid; |
2142 | } | |
f2665db5 MM |
2143 | else if ((scheduler_mode == schedlock_replay) |
2144 | && target_record_will_replay (minus_one_ptid, execution_direction)) | |
2145 | { | |
2146 | /* User-settable 'scheduler' mode requires solo thread resume in replay | |
2147 | mode. */ | |
2148 | resume_ptid = inferior_ptid; | |
2149 | } | |
f3263aa4 PA |
2150 | else if (!sched_multi && target_supports_multi_process ()) |
2151 | { | |
2152 | /* Resume all threads of the current process (and none of other | |
2153 | processes). */ | |
e99b03dc | 2154 | resume_ptid = ptid_t (inferior_ptid.pid ()); |
f3263aa4 PA |
2155 | } |
2156 | else | |
2157 | { | |
2158 | /* Resume all threads of all processes. */ | |
2159 | resume_ptid = RESUME_ALL; | |
2160 | } | |
09cee04b PA |
2161 | |
2162 | return resume_ptid; | |
2163 | } | |
2164 | ||
fbea99ea PA |
2165 | /* Return a ptid representing the set of threads that we will resume, |
2166 | in the perspective of the target, assuming run control handling | |
2167 | does not require leaving some threads stopped (e.g., stepping past | |
2168 | breakpoint). USER_STEP indicates whether we're about to start the | |
2169 | target for a stepping command. */ | |
2170 | ||
2171 | static ptid_t | |
2172 | internal_resume_ptid (int user_step) | |
2173 | { | |
2174 | /* In non-stop, we always control threads individually. Note that | |
2175 | the target may always work in non-stop mode even with "set | |
2176 | non-stop off", in which case user_visible_resume_ptid could | |
2177 | return a wildcard ptid. */ | |
2178 | if (target_is_non_stop_p ()) | |
2179 | return inferior_ptid; | |
2180 | else | |
2181 | return user_visible_resume_ptid (user_step); | |
2182 | } | |
2183 | ||
64ce06e4 PA |
2184 | /* Wrapper for target_resume, that handles infrun-specific |
2185 | bookkeeping. */ | |
2186 | ||
2187 | static void | |
2188 | do_target_resume (ptid_t resume_ptid, int step, enum gdb_signal sig) | |
2189 | { | |
2190 | struct thread_info *tp = inferior_thread (); | |
2191 | ||
c65d6b55 PA |
2192 | gdb_assert (!tp->stop_requested); |
2193 | ||
64ce06e4 | 2194 | /* Install inferior's terminal modes. */ |
223ffa71 | 2195 | target_terminal::inferior (); |
64ce06e4 PA |
2196 | |
2197 | /* Avoid confusing the next resume, if the next stop/resume | |
2198 | happens to apply to another thread. */ | |
2199 | tp->suspend.stop_signal = GDB_SIGNAL_0; | |
2200 | ||
8f572e5c PA |
2201 | /* Advise target which signals may be handled silently. |
2202 | ||
2203 | If we have removed breakpoints because we are stepping over one | |
2204 | in-line (in any thread), we need to receive all signals to avoid | |
2205 | accidentally skipping a breakpoint during execution of a signal | |
2206 | handler. | |
2207 | ||
2208 | Likewise if we're displaced stepping, otherwise a trap for a | |
2209 | breakpoint in a signal handler might be confused with the | |
2210 | displaced step finishing. We don't make the displaced_step_fixup | |
2211 | step distinguish the cases instead, because: | |
2212 | ||
2213 | - a backtrace while stopped in the signal handler would show the | |
2214 | scratch pad as frame older than the signal handler, instead of | |
2215 | the real mainline code. | |
2216 | ||
2217 | - when the thread is later resumed, the signal handler would | |
2218 | return to the scratch pad area, which would no longer be | |
2219 | valid. */ | |
2220 | if (step_over_info_valid_p () | |
00431a78 | 2221 | || displaced_step_in_progress (tp->inf)) |
64ce06e4 PA |
2222 | target_pass_signals (0, NULL); |
2223 | else | |
2224 | target_pass_signals ((int) GDB_SIGNAL_LAST, signal_pass); | |
2225 | ||
2226 | target_resume (resume_ptid, step, sig); | |
85ad3aaf PA |
2227 | |
2228 | target_commit_resume (); | |
64ce06e4 PA |
2229 | } |
2230 | ||
d930703d | 2231 | /* Resume the inferior. SIG is the signal to give the inferior |
71d378ae PA |
2232 | (GDB_SIGNAL_0 for none). Note: don't call this directly; instead |
2233 | call 'resume', which handles exceptions. */ | |
c906108c | 2234 | |
71d378ae PA |
2235 | static void |
2236 | resume_1 (enum gdb_signal sig) | |
c906108c | 2237 | { |
515630c5 | 2238 | struct regcache *regcache = get_current_regcache (); |
ac7936df | 2239 | struct gdbarch *gdbarch = regcache->arch (); |
4e1c45ea | 2240 | struct thread_info *tp = inferior_thread (); |
515630c5 | 2241 | CORE_ADDR pc = regcache_read_pc (regcache); |
8b86c959 | 2242 | const address_space *aspace = regcache->aspace (); |
b0f16a3e | 2243 | ptid_t resume_ptid; |
856e7dd6 PA |
2244 | /* This represents the user's step vs continue request. When |
2245 | deciding whether "set scheduler-locking step" applies, it's the | |
2246 | user's intention that counts. */ | |
2247 | const int user_step = tp->control.stepping_command; | |
64ce06e4 PA |
2248 | /* This represents what we'll actually request the target to do. |
2249 | This can decay from a step to a continue, if e.g., we need to | |
2250 | implement single-stepping with breakpoints (software | |
2251 | single-step). */ | |
6b403daa | 2252 | int step; |
c7e8a53c | 2253 | |
c65d6b55 | 2254 | gdb_assert (!tp->stop_requested); |
c2829269 PA |
2255 | gdb_assert (!thread_is_in_step_over_chain (tp)); |
2256 | ||
372316f1 PA |
2257 | if (tp->suspend.waitstatus_pending_p) |
2258 | { | |
2259 | if (debug_infrun) | |
2260 | { | |
23fdd69e SM |
2261 | std::string statstr |
2262 | = target_waitstatus_to_string (&tp->suspend.waitstatus); | |
372316f1 | 2263 | |
372316f1 | 2264 | fprintf_unfiltered (gdb_stdlog, |
23fdd69e SM |
2265 | "infrun: resume: thread %s has pending wait " |
2266 | "status %s (currently_stepping=%d).\n", | |
2267 | target_pid_to_str (tp->ptid), statstr.c_str (), | |
372316f1 | 2268 | currently_stepping (tp)); |
372316f1 PA |
2269 | } |
2270 | ||
2271 | tp->resumed = 1; | |
2272 | ||
2273 | /* FIXME: What should we do if we are supposed to resume this | |
2274 | thread with a signal? Maybe we should maintain a queue of | |
2275 | pending signals to deliver. */ | |
2276 | if (sig != GDB_SIGNAL_0) | |
2277 | { | |
fd7dcb94 | 2278 | warning (_("Couldn't deliver signal %s to %s."), |
372316f1 PA |
2279 | gdb_signal_to_name (sig), target_pid_to_str (tp->ptid)); |
2280 | } | |
2281 | ||
2282 | tp->suspend.stop_signal = GDB_SIGNAL_0; | |
372316f1 PA |
2283 | |
2284 | if (target_can_async_p ()) | |
9516f85a AB |
2285 | { |
2286 | target_async (1); | |
2287 | /* Tell the event loop we have an event to process. */ | |
2288 | mark_async_event_handler (infrun_async_inferior_event_token); | |
2289 | } | |
372316f1 PA |
2290 | return; |
2291 | } | |
2292 | ||
2293 | tp->stepped_breakpoint = 0; | |
2294 | ||
6b403daa PA |
2295 | /* Depends on stepped_breakpoint. */ |
2296 | step = currently_stepping (tp); | |
2297 | ||
74609e71 YQ |
2298 | if (current_inferior ()->waiting_for_vfork_done) |
2299 | { | |
48f9886d PA |
2300 | /* Don't try to single-step a vfork parent that is waiting for |
2301 | the child to get out of the shared memory region (by exec'ing | |
2302 | or exiting). This is particularly important on software | |
2303 | single-step archs, as the child process would trip on the | |
2304 | software single step breakpoint inserted for the parent | |
2305 | process. Since the parent will not actually execute any | |
2306 | instruction until the child is out of the shared region (such | |
2307 | are vfork's semantics), it is safe to simply continue it. | |
2308 | Eventually, we'll see a TARGET_WAITKIND_VFORK_DONE event for | |
2309 | the parent, and tell it to `keep_going', which automatically | |
2310 | re-sets it stepping. */ | |
74609e71 YQ |
2311 | if (debug_infrun) |
2312 | fprintf_unfiltered (gdb_stdlog, | |
2313 | "infrun: resume : clear step\n"); | |
a09dd441 | 2314 | step = 0; |
74609e71 YQ |
2315 | } |
2316 | ||
527159b7 | 2317 | if (debug_infrun) |
237fc4c9 | 2318 | fprintf_unfiltered (gdb_stdlog, |
c9737c08 | 2319 | "infrun: resume (step=%d, signal=%s), " |
0d9a9a5f | 2320 | "trap_expected=%d, current thread [%s] at %s\n", |
c9737c08 PA |
2321 | step, gdb_signal_to_symbol_string (sig), |
2322 | tp->control.trap_expected, | |
0d9a9a5f PA |
2323 | target_pid_to_str (inferior_ptid), |
2324 | paddress (gdbarch, pc)); | |
c906108c | 2325 | |
c2c6d25f JM |
2326 | /* Normally, by the time we reach `resume', the breakpoints are either |
2327 | removed or inserted, as appropriate. The exception is if we're sitting | |
2328 | at a permanent breakpoint; we need to step over it, but permanent | |
2329 | breakpoints can't be removed. So we have to test for it here. */ | |
6c95b8df | 2330 | if (breakpoint_here_p (aspace, pc) == permanent_breakpoint_here) |
6d350bb5 | 2331 | { |
af48d08f PA |
2332 | if (sig != GDB_SIGNAL_0) |
2333 | { | |
2334 | /* We have a signal to pass to the inferior. The resume | |
2335 | may, or may not take us to the signal handler. If this | |
2336 | is a step, we'll need to stop in the signal handler, if | |
2337 | there's one, (if the target supports stepping into | |
2338 | handlers), or in the next mainline instruction, if | |
2339 | there's no handler. If this is a continue, we need to be | |
2340 | sure to run the handler with all breakpoints inserted. | |
2341 | In all cases, set a breakpoint at the current address | |
2342 | (where the handler returns to), and once that breakpoint | |
2343 | is hit, resume skipping the permanent breakpoint. If | |
2344 | that breakpoint isn't hit, then we've stepped into the | |
2345 | signal handler (or hit some other event). We'll delete | |
2346 | the step-resume breakpoint then. */ | |
2347 | ||
2348 | if (debug_infrun) | |
2349 | fprintf_unfiltered (gdb_stdlog, | |
2350 | "infrun: resume: skipping permanent breakpoint, " | |
2351 | "deliver signal first\n"); | |
2352 | ||
2353 | clear_step_over_info (); | |
2354 | tp->control.trap_expected = 0; | |
2355 | ||
2356 | if (tp->control.step_resume_breakpoint == NULL) | |
2357 | { | |
2358 | /* Set a "high-priority" step-resume, as we don't want | |
2359 | user breakpoints at PC to trigger (again) when this | |
2360 | hits. */ | |
2361 | insert_hp_step_resume_breakpoint_at_frame (get_current_frame ()); | |
2362 | gdb_assert (tp->control.step_resume_breakpoint->loc->permanent); | |
2363 | ||
2364 | tp->step_after_step_resume_breakpoint = step; | |
2365 | } | |
2366 | ||
2367 | insert_breakpoints (); | |
2368 | } | |
2369 | else | |
2370 | { | |
2371 | /* There's no signal to pass, we can go ahead and skip the | |
2372 | permanent breakpoint manually. */ | |
2373 | if (debug_infrun) | |
2374 | fprintf_unfiltered (gdb_stdlog, | |
2375 | "infrun: resume: skipping permanent breakpoint\n"); | |
2376 | gdbarch_skip_permanent_breakpoint (gdbarch, regcache); | |
2377 | /* Update pc to reflect the new address from which we will | |
2378 | execute instructions. */ | |
2379 | pc = regcache_read_pc (regcache); | |
2380 | ||
2381 | if (step) | |
2382 | { | |
2383 | /* We've already advanced the PC, so the stepping part | |
2384 | is done. Now we need to arrange for a trap to be | |
2385 | reported to handle_inferior_event. Set a breakpoint | |
2386 | at the current PC, and run to it. Don't update | |
2387 | prev_pc, because if we end in | |
44a1ee51 PA |
2388 | switch_back_to_stepped_thread, we want the "expected |
2389 | thread advanced also" branch to be taken. IOW, we | |
2390 | don't want this thread to step further from PC | |
af48d08f | 2391 | (overstep). */ |
1ac806b8 | 2392 | gdb_assert (!step_over_info_valid_p ()); |
af48d08f PA |
2393 | insert_single_step_breakpoint (gdbarch, aspace, pc); |
2394 | insert_breakpoints (); | |
2395 | ||
fbea99ea | 2396 | resume_ptid = internal_resume_ptid (user_step); |
1ac806b8 | 2397 | do_target_resume (resume_ptid, 0, GDB_SIGNAL_0); |
372316f1 | 2398 | tp->resumed = 1; |
af48d08f PA |
2399 | return; |
2400 | } | |
2401 | } | |
6d350bb5 | 2402 | } |
c2c6d25f | 2403 | |
c1e36e3e PA |
2404 | /* If we have a breakpoint to step over, make sure to do a single |
2405 | step only. Same if we have software watchpoints. */ | |
2406 | if (tp->control.trap_expected || bpstat_should_step ()) | |
2407 | tp->control.may_range_step = 0; | |
2408 | ||
237fc4c9 PA |
2409 | /* If enabled, step over breakpoints by executing a copy of the |
2410 | instruction at a different address. | |
2411 | ||
2412 | We can't use displaced stepping when we have a signal to deliver; | |
2413 | the comments for displaced_step_prepare explain why. The | |
2414 | comments in the handle_inferior event for dealing with 'random | |
74609e71 YQ |
2415 | signals' explain what we do instead. |
2416 | ||
2417 | We can't use displaced stepping when we are waiting for vfork_done | |
2418 | event, displaced stepping breaks the vfork child similarly as single | |
2419 | step software breakpoint. */ | |
3fc8eb30 PA |
2420 | if (tp->control.trap_expected |
2421 | && use_displaced_stepping (tp) | |
cb71640d | 2422 | && !step_over_info_valid_p () |
a493e3e2 | 2423 | && sig == GDB_SIGNAL_0 |
74609e71 | 2424 | && !current_inferior ()->waiting_for_vfork_done) |
237fc4c9 | 2425 | { |
00431a78 | 2426 | int prepared = displaced_step_prepare (tp); |
fc1cf338 | 2427 | |
3fc8eb30 | 2428 | if (prepared == 0) |
d56b7306 | 2429 | { |
4d9d9d04 PA |
2430 | if (debug_infrun) |
2431 | fprintf_unfiltered (gdb_stdlog, | |
2432 | "Got placed in step-over queue\n"); | |
2433 | ||
2434 | tp->control.trap_expected = 0; | |
d56b7306 VP |
2435 | return; |
2436 | } | |
3fc8eb30 PA |
2437 | else if (prepared < 0) |
2438 | { | |
2439 | /* Fallback to stepping over the breakpoint in-line. */ | |
2440 | ||
2441 | if (target_is_non_stop_p ()) | |
2442 | stop_all_threads (); | |
2443 | ||
a01bda52 | 2444 | set_step_over_info (regcache->aspace (), |
21edc42f | 2445 | regcache_read_pc (regcache), 0, tp->global_num); |
3fc8eb30 PA |
2446 | |
2447 | step = maybe_software_singlestep (gdbarch, pc); | |
2448 | ||
2449 | insert_breakpoints (); | |
2450 | } | |
2451 | else if (prepared > 0) | |
2452 | { | |
2453 | struct displaced_step_inferior_state *displaced; | |
99e40580 | 2454 | |
3fc8eb30 PA |
2455 | /* Update pc to reflect the new address from which we will |
2456 | execute instructions due to displaced stepping. */ | |
00431a78 | 2457 | pc = regcache_read_pc (get_thread_regcache (tp)); |
ca7781d2 | 2458 | |
00431a78 | 2459 | displaced = get_displaced_stepping_state (tp->inf); |
3fc8eb30 PA |
2460 | step = gdbarch_displaced_step_hw_singlestep (gdbarch, |
2461 | displaced->step_closure); | |
2462 | } | |
237fc4c9 PA |
2463 | } |
2464 | ||
2facfe5c | 2465 | /* Do we need to do it the hard way, w/temp breakpoints? */ |
99e40580 | 2466 | else if (step) |
2facfe5c | 2467 | step = maybe_software_singlestep (gdbarch, pc); |
c906108c | 2468 | |
30852783 UW |
2469 | /* Currently, our software single-step implementation leads to different |
2470 | results than hardware single-stepping in one situation: when stepping | |
2471 | into delivering a signal which has an associated signal handler, | |
2472 | hardware single-step will stop at the first instruction of the handler, | |
2473 | while software single-step will simply skip execution of the handler. | |
2474 | ||
2475 | For now, this difference in behavior is accepted since there is no | |
2476 | easy way to actually implement single-stepping into a signal handler | |
2477 | without kernel support. | |
2478 | ||
2479 | However, there is one scenario where this difference leads to follow-on | |
2480 | problems: if we're stepping off a breakpoint by removing all breakpoints | |
2481 | and then single-stepping. In this case, the software single-step | |
2482 | behavior means that even if there is a *breakpoint* in the signal | |
2483 | handler, GDB still would not stop. | |
2484 | ||
2485 | Fortunately, we can at least fix this particular issue. We detect | |
2486 | here the case where we are about to deliver a signal while software | |
2487 | single-stepping with breakpoints removed. In this situation, we | |
2488 | revert the decisions to remove all breakpoints and insert single- | |
2489 | step breakpoints, and instead we install a step-resume breakpoint | |
2490 | at the current address, deliver the signal without stepping, and | |
2491 | once we arrive back at the step-resume breakpoint, actually step | |
2492 | over the breakpoint we originally wanted to step over. */ | |
34b7e8a6 | 2493 | if (thread_has_single_step_breakpoints_set (tp) |
6cc83d2a PA |
2494 | && sig != GDB_SIGNAL_0 |
2495 | && step_over_info_valid_p ()) | |
30852783 UW |
2496 | { |
2497 | /* If we have nested signals or a pending signal is delivered | |
2498 | immediately after a handler returns, might might already have | |
2499 | a step-resume breakpoint set on the earlier handler. We cannot | |
2500 | set another step-resume breakpoint; just continue on until the | |
2501 | original breakpoint is hit. */ | |
2502 | if (tp->control.step_resume_breakpoint == NULL) | |
2503 | { | |
2c03e5be | 2504 | insert_hp_step_resume_breakpoint_at_frame (get_current_frame ()); |
30852783 UW |
2505 | tp->step_after_step_resume_breakpoint = 1; |
2506 | } | |
2507 | ||
34b7e8a6 | 2508 | delete_single_step_breakpoints (tp); |
30852783 | 2509 | |
31e77af2 | 2510 | clear_step_over_info (); |
30852783 | 2511 | tp->control.trap_expected = 0; |
31e77af2 PA |
2512 | |
2513 | insert_breakpoints (); | |
30852783 UW |
2514 | } |
2515 | ||
b0f16a3e SM |
2516 | /* If STEP is set, it's a request to use hardware stepping |
2517 | facilities. But in that case, we should never | |
2518 | use singlestep breakpoint. */ | |
34b7e8a6 | 2519 | gdb_assert (!(thread_has_single_step_breakpoints_set (tp) && step)); |
dfcd3bfb | 2520 | |
fbea99ea | 2521 | /* Decide the set of threads to ask the target to resume. */ |
1946c4cc | 2522 | if (tp->control.trap_expected) |
b0f16a3e SM |
2523 | { |
2524 | /* We're allowing a thread to run past a breakpoint it has | |
1946c4cc YQ |
2525 | hit, either by single-stepping the thread with the breakpoint |
2526 | removed, or by displaced stepping, with the breakpoint inserted. | |
2527 | In the former case, we need to single-step only this thread, | |
2528 | and keep others stopped, as they can miss this breakpoint if | |
2529 | allowed to run. That's not really a problem for displaced | |
2530 | stepping, but, we still keep other threads stopped, in case | |
2531 | another thread is also stopped for a breakpoint waiting for | |
2532 | its turn in the displaced stepping queue. */ | |
b0f16a3e SM |
2533 | resume_ptid = inferior_ptid; |
2534 | } | |
fbea99ea PA |
2535 | else |
2536 | resume_ptid = internal_resume_ptid (user_step); | |
d4db2f36 | 2537 | |
7f5ef605 PA |
2538 | if (execution_direction != EXEC_REVERSE |
2539 | && step && breakpoint_inserted_here_p (aspace, pc)) | |
b0f16a3e | 2540 | { |
372316f1 PA |
2541 | /* There are two cases where we currently need to step a |
2542 | breakpoint instruction when we have a signal to deliver: | |
2543 | ||
2544 | - See handle_signal_stop where we handle random signals that | |
2545 | could take out us out of the stepping range. Normally, in | |
2546 | that case we end up continuing (instead of stepping) over the | |
7f5ef605 PA |
2547 | signal handler with a breakpoint at PC, but there are cases |
2548 | where we should _always_ single-step, even if we have a | |
2549 | step-resume breakpoint, like when a software watchpoint is | |
2550 | set. Assuming single-stepping and delivering a signal at the | |
2551 | same time would takes us to the signal handler, then we could | |
2552 | have removed the breakpoint at PC to step over it. However, | |
2553 | some hardware step targets (like e.g., Mac OS) can't step | |
2554 | into signal handlers, and for those, we need to leave the | |
2555 | breakpoint at PC inserted, as otherwise if the handler | |
2556 | recurses and executes PC again, it'll miss the breakpoint. | |
2557 | So we leave the breakpoint inserted anyway, but we need to | |
2558 | record that we tried to step a breakpoint instruction, so | |
372316f1 PA |
2559 | that adjust_pc_after_break doesn't end up confused. |
2560 | ||
2561 | - In non-stop if we insert a breakpoint (e.g., a step-resume) | |
2562 | in one thread after another thread that was stepping had been | |
2563 | momentarily paused for a step-over. When we re-resume the | |
2564 | stepping thread, it may be resumed from that address with a | |
2565 | breakpoint that hasn't trapped yet. Seen with | |
2566 | gdb.threads/non-stop-fair-events.exp, on targets that don't | |
2567 | do displaced stepping. */ | |
2568 | ||
2569 | if (debug_infrun) | |
2570 | fprintf_unfiltered (gdb_stdlog, | |
2571 | "infrun: resume: [%s] stepped breakpoint\n", | |
2572 | target_pid_to_str (tp->ptid)); | |
7f5ef605 PA |
2573 | |
2574 | tp->stepped_breakpoint = 1; | |
2575 | ||
b0f16a3e SM |
2576 | /* Most targets can step a breakpoint instruction, thus |
2577 | executing it normally. But if this one cannot, just | |
2578 | continue and we will hit it anyway. */ | |
7f5ef605 | 2579 | if (gdbarch_cannot_step_breakpoint (gdbarch)) |
b0f16a3e SM |
2580 | step = 0; |
2581 | } | |
ef5cf84e | 2582 | |
b0f16a3e | 2583 | if (debug_displaced |
cb71640d | 2584 | && tp->control.trap_expected |
3fc8eb30 | 2585 | && use_displaced_stepping (tp) |
cb71640d | 2586 | && !step_over_info_valid_p ()) |
b0f16a3e | 2587 | { |
00431a78 | 2588 | struct regcache *resume_regcache = get_thread_regcache (tp); |
ac7936df | 2589 | struct gdbarch *resume_gdbarch = resume_regcache->arch (); |
b0f16a3e SM |
2590 | CORE_ADDR actual_pc = regcache_read_pc (resume_regcache); |
2591 | gdb_byte buf[4]; | |
2592 | ||
2593 | fprintf_unfiltered (gdb_stdlog, "displaced: run %s: ", | |
2594 | paddress (resume_gdbarch, actual_pc)); | |
2595 | read_memory (actual_pc, buf, sizeof (buf)); | |
2596 | displaced_step_dump_bytes (gdb_stdlog, buf, sizeof (buf)); | |
2597 | } | |
237fc4c9 | 2598 | |
b0f16a3e SM |
2599 | if (tp->control.may_range_step) |
2600 | { | |
2601 | /* If we're resuming a thread with the PC out of the step | |
2602 | range, then we're doing some nested/finer run control | |
2603 | operation, like stepping the thread out of the dynamic | |
2604 | linker or the displaced stepping scratch pad. We | |
2605 | shouldn't have allowed a range step then. */ | |
2606 | gdb_assert (pc_in_thread_step_range (pc, tp)); | |
2607 | } | |
c1e36e3e | 2608 | |
64ce06e4 | 2609 | do_target_resume (resume_ptid, step, sig); |
372316f1 | 2610 | tp->resumed = 1; |
c906108c | 2611 | } |
71d378ae PA |
2612 | |
2613 | /* Resume the inferior. SIG is the signal to give the inferior | |
2614 | (GDB_SIGNAL_0 for none). This is a wrapper around 'resume_1' that | |
2615 | rolls back state on error. */ | |
2616 | ||
aff4e175 | 2617 | static void |
71d378ae PA |
2618 | resume (gdb_signal sig) |
2619 | { | |
2620 | TRY | |
2621 | { | |
2622 | resume_1 (sig); | |
2623 | } | |
2624 | CATCH (ex, RETURN_MASK_ALL) | |
2625 | { | |
2626 | /* If resuming is being aborted for any reason, delete any | |
2627 | single-step breakpoint resume_1 may have created, to avoid | |
2628 | confusing the following resumption, and to avoid leaving | |
2629 | single-step breakpoints perturbing other threads, in case | |
2630 | we're running in non-stop mode. */ | |
2631 | if (inferior_ptid != null_ptid) | |
2632 | delete_single_step_breakpoints (inferior_thread ()); | |
2633 | throw_exception (ex); | |
2634 | } | |
2635 | END_CATCH | |
2636 | } | |
2637 | ||
c906108c | 2638 | \f |
237fc4c9 | 2639 | /* Proceeding. */ |
c906108c | 2640 | |
4c2f2a79 PA |
2641 | /* See infrun.h. */ |
2642 | ||
2643 | /* Counter that tracks number of user visible stops. This can be used | |
2644 | to tell whether a command has proceeded the inferior past the | |
2645 | current location. This allows e.g., inferior function calls in | |
2646 | breakpoint commands to not interrupt the command list. When the | |
2647 | call finishes successfully, the inferior is standing at the same | |
2648 | breakpoint as if nothing happened (and so we don't call | |
2649 | normal_stop). */ | |
2650 | static ULONGEST current_stop_id; | |
2651 | ||
2652 | /* See infrun.h. */ | |
2653 | ||
2654 | ULONGEST | |
2655 | get_stop_id (void) | |
2656 | { | |
2657 | return current_stop_id; | |
2658 | } | |
2659 | ||
2660 | /* Called when we report a user visible stop. */ | |
2661 | ||
2662 | static void | |
2663 | new_stop_id (void) | |
2664 | { | |
2665 | current_stop_id++; | |
2666 | } | |
2667 | ||
c906108c SS |
2668 | /* Clear out all variables saying what to do when inferior is continued. |
2669 | First do this, then set the ones you want, then call `proceed'. */ | |
2670 | ||
a7212384 UW |
2671 | static void |
2672 | clear_proceed_status_thread (struct thread_info *tp) | |
c906108c | 2673 | { |
a7212384 UW |
2674 | if (debug_infrun) |
2675 | fprintf_unfiltered (gdb_stdlog, | |
2676 | "infrun: clear_proceed_status_thread (%s)\n", | |
2677 | target_pid_to_str (tp->ptid)); | |
d6b48e9c | 2678 | |
372316f1 PA |
2679 | /* If we're starting a new sequence, then the previous finished |
2680 | single-step is no longer relevant. */ | |
2681 | if (tp->suspend.waitstatus_pending_p) | |
2682 | { | |
2683 | if (tp->suspend.stop_reason == TARGET_STOPPED_BY_SINGLE_STEP) | |
2684 | { | |
2685 | if (debug_infrun) | |
2686 | fprintf_unfiltered (gdb_stdlog, | |
2687 | "infrun: clear_proceed_status: pending " | |
2688 | "event of %s was a finished step. " | |
2689 | "Discarding.\n", | |
2690 | target_pid_to_str (tp->ptid)); | |
2691 | ||
2692 | tp->suspend.waitstatus_pending_p = 0; | |
2693 | tp->suspend.stop_reason = TARGET_STOPPED_BY_NO_REASON; | |
2694 | } | |
2695 | else if (debug_infrun) | |
2696 | { | |
23fdd69e SM |
2697 | std::string statstr |
2698 | = target_waitstatus_to_string (&tp->suspend.waitstatus); | |
372316f1 | 2699 | |
372316f1 PA |
2700 | fprintf_unfiltered (gdb_stdlog, |
2701 | "infrun: clear_proceed_status_thread: thread %s " | |
2702 | "has pending wait status %s " | |
2703 | "(currently_stepping=%d).\n", | |
23fdd69e | 2704 | target_pid_to_str (tp->ptid), statstr.c_str (), |
372316f1 | 2705 | currently_stepping (tp)); |
372316f1 PA |
2706 | } |
2707 | } | |
2708 | ||
70509625 PA |
2709 | /* If this signal should not be seen by program, give it zero. |
2710 | Used for debugging signals. */ | |
2711 | if (!signal_pass_state (tp->suspend.stop_signal)) | |
2712 | tp->suspend.stop_signal = GDB_SIGNAL_0; | |
2713 | ||
243a9253 PA |
2714 | thread_fsm_delete (tp->thread_fsm); |
2715 | tp->thread_fsm = NULL; | |
2716 | ||
16c381f0 JK |
2717 | tp->control.trap_expected = 0; |
2718 | tp->control.step_range_start = 0; | |
2719 | tp->control.step_range_end = 0; | |
c1e36e3e | 2720 | tp->control.may_range_step = 0; |
16c381f0 JK |
2721 | tp->control.step_frame_id = null_frame_id; |
2722 | tp->control.step_stack_frame_id = null_frame_id; | |
2723 | tp->control.step_over_calls = STEP_OVER_UNDEBUGGABLE; | |
885eeb5b | 2724 | tp->control.step_start_function = NULL; |
a7212384 | 2725 | tp->stop_requested = 0; |
4e1c45ea | 2726 | |
16c381f0 | 2727 | tp->control.stop_step = 0; |
32400beb | 2728 | |
16c381f0 | 2729 | tp->control.proceed_to_finish = 0; |
414c69f7 | 2730 | |
856e7dd6 | 2731 | tp->control.stepping_command = 0; |
17b2616c | 2732 | |
a7212384 | 2733 | /* Discard any remaining commands or status from previous stop. */ |
16c381f0 | 2734 | bpstat_clear (&tp->control.stop_bpstat); |
a7212384 | 2735 | } |
32400beb | 2736 | |
a7212384 | 2737 | void |
70509625 | 2738 | clear_proceed_status (int step) |
a7212384 | 2739 | { |
f2665db5 MM |
2740 | /* With scheduler-locking replay, stop replaying other threads if we're |
2741 | not replaying the user-visible resume ptid. | |
2742 | ||
2743 | This is a convenience feature to not require the user to explicitly | |
2744 | stop replaying the other threads. We're assuming that the user's | |
2745 | intent is to resume tracing the recorded process. */ | |
2746 | if (!non_stop && scheduler_mode == schedlock_replay | |
2747 | && target_record_is_replaying (minus_one_ptid) | |
2748 | && !target_record_will_replay (user_visible_resume_ptid (step), | |
2749 | execution_direction)) | |
2750 | target_record_stop_replaying (); | |
2751 | ||
08036331 | 2752 | if (!non_stop && inferior_ptid != null_ptid) |
6c95b8df | 2753 | { |
08036331 | 2754 | ptid_t resume_ptid = user_visible_resume_ptid (step); |
70509625 PA |
2755 | |
2756 | /* In all-stop mode, delete the per-thread status of all threads | |
2757 | we're about to resume, implicitly and explicitly. */ | |
08036331 PA |
2758 | for (thread_info *tp : all_non_exited_threads (resume_ptid)) |
2759 | clear_proceed_status_thread (tp); | |
6c95b8df PA |
2760 | } |
2761 | ||
d7e15655 | 2762 | if (inferior_ptid != null_ptid) |
a7212384 UW |
2763 | { |
2764 | struct inferior *inferior; | |
2765 | ||
2766 | if (non_stop) | |
2767 | { | |
6c95b8df PA |
2768 | /* If in non-stop mode, only delete the per-thread status of |
2769 | the current thread. */ | |
a7212384 UW |
2770 | clear_proceed_status_thread (inferior_thread ()); |
2771 | } | |
6c95b8df | 2772 | |
d6b48e9c | 2773 | inferior = current_inferior (); |
16c381f0 | 2774 | inferior->control.stop_soon = NO_STOP_QUIETLY; |
4e1c45ea PA |
2775 | } |
2776 | ||
76727919 | 2777 | gdb::observers::about_to_proceed.notify (); |
c906108c SS |
2778 | } |
2779 | ||
99619bea PA |
2780 | /* Returns true if TP is still stopped at a breakpoint that needs |
2781 | stepping-over in order to make progress. If the breakpoint is gone | |
2782 | meanwhile, we can skip the whole step-over dance. */ | |
ea67f13b DJ |
2783 | |
2784 | static int | |
6c4cfb24 | 2785 | thread_still_needs_step_over_bp (struct thread_info *tp) |
99619bea PA |
2786 | { |
2787 | if (tp->stepping_over_breakpoint) | |
2788 | { | |
00431a78 | 2789 | struct regcache *regcache = get_thread_regcache (tp); |
99619bea | 2790 | |
a01bda52 | 2791 | if (breakpoint_here_p (regcache->aspace (), |
af48d08f PA |
2792 | regcache_read_pc (regcache)) |
2793 | == ordinary_breakpoint_here) | |
99619bea PA |
2794 | return 1; |
2795 | ||
2796 | tp->stepping_over_breakpoint = 0; | |
2797 | } | |
2798 | ||
2799 | return 0; | |
2800 | } | |
2801 | ||
6c4cfb24 PA |
2802 | /* Check whether thread TP still needs to start a step-over in order |
2803 | to make progress when resumed. Returns an bitwise or of enum | |
2804 | step_over_what bits, indicating what needs to be stepped over. */ | |
2805 | ||
8d297bbf | 2806 | static step_over_what |
6c4cfb24 PA |
2807 | thread_still_needs_step_over (struct thread_info *tp) |
2808 | { | |
8d297bbf | 2809 | step_over_what what = 0; |
6c4cfb24 PA |
2810 | |
2811 | if (thread_still_needs_step_over_bp (tp)) | |
2812 | what |= STEP_OVER_BREAKPOINT; | |
2813 | ||
2814 | if (tp->stepping_over_watchpoint | |
2815 | && !target_have_steppable_watchpoint) | |
2816 | what |= STEP_OVER_WATCHPOINT; | |
2817 | ||
2818 | return what; | |
2819 | } | |
2820 | ||
483805cf PA |
2821 | /* Returns true if scheduler locking applies. STEP indicates whether |
2822 | we're about to do a step/next-like command to a thread. */ | |
2823 | ||
2824 | static int | |
856e7dd6 | 2825 | schedlock_applies (struct thread_info *tp) |
483805cf PA |
2826 | { |
2827 | return (scheduler_mode == schedlock_on | |
2828 | || (scheduler_mode == schedlock_step | |
f2665db5 MM |
2829 | && tp->control.stepping_command) |
2830 | || (scheduler_mode == schedlock_replay | |
2831 | && target_record_will_replay (minus_one_ptid, | |
2832 | execution_direction))); | |
483805cf PA |
2833 | } |
2834 | ||
c906108c SS |
2835 | /* Basic routine for continuing the program in various fashions. |
2836 | ||
2837 | ADDR is the address to resume at, or -1 for resume where stopped. | |
aff4e175 AB |
2838 | SIGGNAL is the signal to give it, or GDB_SIGNAL_0 for none, |
2839 | or GDB_SIGNAL_DEFAULT for act according to how it stopped. | |
c906108c SS |
2840 | |
2841 | You should call clear_proceed_status before calling proceed. */ | |
2842 | ||
2843 | void | |
64ce06e4 | 2844 | proceed (CORE_ADDR addr, enum gdb_signal siggnal) |
c906108c | 2845 | { |
e58b0e63 PA |
2846 | struct regcache *regcache; |
2847 | struct gdbarch *gdbarch; | |
e58b0e63 | 2848 | CORE_ADDR pc; |
4d9d9d04 PA |
2849 | ptid_t resume_ptid; |
2850 | struct execution_control_state ecss; | |
2851 | struct execution_control_state *ecs = &ecss; | |
4d9d9d04 | 2852 | int started; |
c906108c | 2853 | |
e58b0e63 PA |
2854 | /* If we're stopped at a fork/vfork, follow the branch set by the |
2855 | "set follow-fork-mode" command; otherwise, we'll just proceed | |
2856 | resuming the current thread. */ | |
2857 | if (!follow_fork ()) | |
2858 | { | |
2859 | /* The target for some reason decided not to resume. */ | |
2860 | normal_stop (); | |
f148b27e PA |
2861 | if (target_can_async_p ()) |
2862 | inferior_event_handler (INF_EXEC_COMPLETE, NULL); | |
e58b0e63 PA |
2863 | return; |
2864 | } | |
2865 | ||
842951eb PA |
2866 | /* We'll update this if & when we switch to a new thread. */ |
2867 | previous_inferior_ptid = inferior_ptid; | |
2868 | ||
e58b0e63 | 2869 | regcache = get_current_regcache (); |
ac7936df | 2870 | gdbarch = regcache->arch (); |
8b86c959 YQ |
2871 | const address_space *aspace = regcache->aspace (); |
2872 | ||
e58b0e63 | 2873 | pc = regcache_read_pc (regcache); |
08036331 | 2874 | thread_info *cur_thr = inferior_thread (); |
e58b0e63 | 2875 | |
99619bea | 2876 | /* Fill in with reasonable starting values. */ |
08036331 | 2877 | init_thread_stepping_state (cur_thr); |
99619bea | 2878 | |
08036331 | 2879 | gdb_assert (!thread_is_in_step_over_chain (cur_thr)); |
c2829269 | 2880 | |
2acceee2 | 2881 | if (addr == (CORE_ADDR) -1) |
c906108c | 2882 | { |
08036331 | 2883 | if (pc == cur_thr->suspend.stop_pc |
af48d08f | 2884 | && breakpoint_here_p (aspace, pc) == ordinary_breakpoint_here |
b2175913 | 2885 | && execution_direction != EXEC_REVERSE) |
3352ef37 AC |
2886 | /* There is a breakpoint at the address we will resume at, |
2887 | step one instruction before inserting breakpoints so that | |
2888 | we do not stop right away (and report a second hit at this | |
b2175913 MS |
2889 | breakpoint). |
2890 | ||
2891 | Note, we don't do this in reverse, because we won't | |
2892 | actually be executing the breakpoint insn anyway. | |
2893 | We'll be (un-)executing the previous instruction. */ | |
08036331 | 2894 | cur_thr->stepping_over_breakpoint = 1; |
515630c5 UW |
2895 | else if (gdbarch_single_step_through_delay_p (gdbarch) |
2896 | && gdbarch_single_step_through_delay (gdbarch, | |
2897 | get_current_frame ())) | |
3352ef37 AC |
2898 | /* We stepped onto an instruction that needs to be stepped |
2899 | again before re-inserting the breakpoint, do so. */ | |
08036331 | 2900 | cur_thr->stepping_over_breakpoint = 1; |
c906108c SS |
2901 | } |
2902 | else | |
2903 | { | |
515630c5 | 2904 | regcache_write_pc (regcache, addr); |
c906108c SS |
2905 | } |
2906 | ||
70509625 | 2907 | if (siggnal != GDB_SIGNAL_DEFAULT) |
08036331 | 2908 | cur_thr->suspend.stop_signal = siggnal; |
70509625 | 2909 | |
08036331 | 2910 | resume_ptid = user_visible_resume_ptid (cur_thr->control.stepping_command); |
4d9d9d04 PA |
2911 | |
2912 | /* If an exception is thrown from this point on, make sure to | |
2913 | propagate GDB's knowledge of the executing state to the | |
2914 | frontend/user running state. */ | |
731f534f | 2915 | scoped_finish_thread_state finish_state (resume_ptid); |
4d9d9d04 PA |
2916 | |
2917 | /* Even if RESUME_PTID is a wildcard, and we end up resuming fewer | |
2918 | threads (e.g., we might need to set threads stepping over | |
2919 | breakpoints first), from the user/frontend's point of view, all | |
2920 | threads in RESUME_PTID are now running. Unless we're calling an | |
2921 | inferior function, as in that case we pretend the inferior | |
2922 | doesn't run at all. */ | |
08036331 | 2923 | if (!cur_thr->control.in_infcall) |
4d9d9d04 | 2924 | set_running (resume_ptid, 1); |
17b2616c | 2925 | |
527159b7 | 2926 | if (debug_infrun) |
8a9de0e4 | 2927 | fprintf_unfiltered (gdb_stdlog, |
64ce06e4 | 2928 | "infrun: proceed (addr=%s, signal=%s)\n", |
c9737c08 | 2929 | paddress (gdbarch, addr), |
64ce06e4 | 2930 | gdb_signal_to_symbol_string (siggnal)); |
527159b7 | 2931 | |
4d9d9d04 PA |
2932 | annotate_starting (); |
2933 | ||
2934 | /* Make sure that output from GDB appears before output from the | |
2935 | inferior. */ | |
2936 | gdb_flush (gdb_stdout); | |
2937 | ||
d930703d PA |
2938 | /* Since we've marked the inferior running, give it the terminal. A |
2939 | QUIT/Ctrl-C from here on is forwarded to the target (which can | |
2940 | still detect attempts to unblock a stuck connection with repeated | |
2941 | Ctrl-C from within target_pass_ctrlc). */ | |
2942 | target_terminal::inferior (); | |
2943 | ||
4d9d9d04 PA |
2944 | /* In a multi-threaded task we may select another thread and |
2945 | then continue or step. | |
2946 | ||
2947 | But if a thread that we're resuming had stopped at a breakpoint, | |
2948 | it will immediately cause another breakpoint stop without any | |
2949 | execution (i.e. it will report a breakpoint hit incorrectly). So | |
2950 | we must step over it first. | |
2951 | ||
2952 | Look for threads other than the current (TP) that reported a | |
2953 | breakpoint hit and haven't been resumed yet since. */ | |
2954 | ||
2955 | /* If scheduler locking applies, we can avoid iterating over all | |
2956 | threads. */ | |
08036331 | 2957 | if (!non_stop && !schedlock_applies (cur_thr)) |
94cc34af | 2958 | { |
08036331 PA |
2959 | for (thread_info *tp : all_non_exited_threads (resume_ptid)) |
2960 | { | |
4d9d9d04 PA |
2961 | /* Ignore the current thread here. It's handled |
2962 | afterwards. */ | |
08036331 | 2963 | if (tp == cur_thr) |
4d9d9d04 | 2964 | continue; |
c906108c | 2965 | |
4d9d9d04 PA |
2966 | if (!thread_still_needs_step_over (tp)) |
2967 | continue; | |
2968 | ||
2969 | gdb_assert (!thread_is_in_step_over_chain (tp)); | |
c906108c | 2970 | |
99619bea PA |
2971 | if (debug_infrun) |
2972 | fprintf_unfiltered (gdb_stdlog, | |
2973 | "infrun: need to step-over [%s] first\n", | |
4d9d9d04 | 2974 | target_pid_to_str (tp->ptid)); |
99619bea | 2975 | |
4d9d9d04 | 2976 | thread_step_over_chain_enqueue (tp); |
2adfaa28 | 2977 | } |
30852783 UW |
2978 | } |
2979 | ||
4d9d9d04 PA |
2980 | /* Enqueue the current thread last, so that we move all other |
2981 | threads over their breakpoints first. */ | |
08036331 PA |
2982 | if (cur_thr->stepping_over_breakpoint) |
2983 | thread_step_over_chain_enqueue (cur_thr); | |
30852783 | 2984 | |
4d9d9d04 PA |
2985 | /* If the thread isn't started, we'll still need to set its prev_pc, |
2986 | so that switch_back_to_stepped_thread knows the thread hasn't | |
2987 | advanced. Must do this before resuming any thread, as in | |
2988 | all-stop/remote, once we resume we can't send any other packet | |
2989 | until the target stops again. */ | |
08036331 | 2990 | cur_thr->prev_pc = regcache_read_pc (regcache); |
99619bea | 2991 | |
a9bc57b9 TT |
2992 | { |
2993 | scoped_restore save_defer_tc = make_scoped_defer_target_commit_resume (); | |
85ad3aaf | 2994 | |
a9bc57b9 | 2995 | started = start_step_over (); |
c906108c | 2996 | |
a9bc57b9 TT |
2997 | if (step_over_info_valid_p ()) |
2998 | { | |
2999 | /* Either this thread started a new in-line step over, or some | |
3000 | other thread was already doing one. In either case, don't | |
3001 | resume anything else until the step-over is finished. */ | |
3002 | } | |
3003 | else if (started && !target_is_non_stop_p ()) | |
3004 | { | |
3005 | /* A new displaced stepping sequence was started. In all-stop, | |
3006 | we can't talk to the target anymore until it next stops. */ | |
3007 | } | |
3008 | else if (!non_stop && target_is_non_stop_p ()) | |
3009 | { | |
3010 | /* In all-stop, but the target is always in non-stop mode. | |
3011 | Start all other threads that are implicitly resumed too. */ | |
08036331 | 3012 | for (thread_info *tp : all_non_exited_threads (resume_ptid)) |
fbea99ea | 3013 | { |
fbea99ea PA |
3014 | if (tp->resumed) |
3015 | { | |
3016 | if (debug_infrun) | |
3017 | fprintf_unfiltered (gdb_stdlog, | |
3018 | "infrun: proceed: [%s] resumed\n", | |
3019 | target_pid_to_str (tp->ptid)); | |
3020 | gdb_assert (tp->executing || tp->suspend.waitstatus_pending_p); | |
3021 | continue; | |
3022 | } | |
3023 | ||
3024 | if (thread_is_in_step_over_chain (tp)) | |
3025 | { | |
3026 | if (debug_infrun) | |
3027 | fprintf_unfiltered (gdb_stdlog, | |
3028 | "infrun: proceed: [%s] needs step-over\n", | |
3029 | target_pid_to_str (tp->ptid)); | |
3030 | continue; | |
3031 | } | |
3032 | ||
3033 | if (debug_infrun) | |
3034 | fprintf_unfiltered (gdb_stdlog, | |
3035 | "infrun: proceed: resuming %s\n", | |
3036 | target_pid_to_str (tp->ptid)); | |
3037 | ||
3038 | reset_ecs (ecs, tp); | |
00431a78 | 3039 | switch_to_thread (tp); |
fbea99ea PA |
3040 | keep_going_pass_signal (ecs); |
3041 | if (!ecs->wait_some_more) | |
fd7dcb94 | 3042 | error (_("Command aborted.")); |
fbea99ea | 3043 | } |
a9bc57b9 | 3044 | } |
08036331 | 3045 | else if (!cur_thr->resumed && !thread_is_in_step_over_chain (cur_thr)) |
a9bc57b9 TT |
3046 | { |
3047 | /* The thread wasn't started, and isn't queued, run it now. */ | |
08036331 PA |
3048 | reset_ecs (ecs, cur_thr); |
3049 | switch_to_thread (cur_thr); | |
a9bc57b9 TT |
3050 | keep_going_pass_signal (ecs); |
3051 | if (!ecs->wait_some_more) | |
3052 | error (_("Command aborted.")); | |
3053 | } | |
3054 | } | |
c906108c | 3055 | |
85ad3aaf PA |
3056 | target_commit_resume (); |
3057 | ||
731f534f | 3058 | finish_state.release (); |
c906108c | 3059 | |
0b333c5e PA |
3060 | /* Tell the event loop to wait for it to stop. If the target |
3061 | supports asynchronous execution, it'll do this from within | |
3062 | target_resume. */ | |
362646f5 | 3063 | if (!target_can_async_p ()) |
0b333c5e | 3064 | mark_async_event_handler (infrun_async_inferior_event_token); |
c906108c | 3065 | } |
c906108c SS |
3066 | \f |
3067 | ||
3068 | /* Start remote-debugging of a machine over a serial link. */ | |
96baa820 | 3069 | |
c906108c | 3070 | void |
8621d6a9 | 3071 | start_remote (int from_tty) |
c906108c | 3072 | { |
d6b48e9c | 3073 | struct inferior *inferior; |
d6b48e9c PA |
3074 | |
3075 | inferior = current_inferior (); | |
16c381f0 | 3076 | inferior->control.stop_soon = STOP_QUIETLY_REMOTE; |
43ff13b4 | 3077 | |
1777feb0 | 3078 | /* Always go on waiting for the target, regardless of the mode. */ |
6426a772 | 3079 | /* FIXME: cagney/1999-09-23: At present it isn't possible to |
7e73cedf | 3080 | indicate to wait_for_inferior that a target should timeout if |
6426a772 JM |
3081 | nothing is returned (instead of just blocking). Because of this, |
3082 | targets expecting an immediate response need to, internally, set | |
3083 | things up so that the target_wait() is forced to eventually | |
1777feb0 | 3084 | timeout. */ |
6426a772 JM |
3085 | /* FIXME: cagney/1999-09-24: It isn't possible for target_open() to |
3086 | differentiate to its caller what the state of the target is after | |
3087 | the initial open has been performed. Here we're assuming that | |
3088 | the target has stopped. It should be possible to eventually have | |
3089 | target_open() return to the caller an indication that the target | |
3090 | is currently running and GDB state should be set to the same as | |
1777feb0 | 3091 | for an async run. */ |
e4c8541f | 3092 | wait_for_inferior (); |
8621d6a9 DJ |
3093 | |
3094 | /* Now that the inferior has stopped, do any bookkeeping like | |
3095 | loading shared libraries. We want to do this before normal_stop, | |
3096 | so that the displayed frame is up to date. */ | |
8b88a78e | 3097 | post_create_inferior (current_top_target (), from_tty); |
8621d6a9 | 3098 | |
6426a772 | 3099 | normal_stop (); |
c906108c SS |
3100 | } |
3101 | ||
3102 | /* Initialize static vars when a new inferior begins. */ | |
3103 | ||
3104 | void | |
96baa820 | 3105 | init_wait_for_inferior (void) |
c906108c SS |
3106 | { |
3107 | /* These are meaningless until the first time through wait_for_inferior. */ | |
c906108c | 3108 | |
c906108c SS |
3109 | breakpoint_init_inferior (inf_starting); |
3110 | ||
70509625 | 3111 | clear_proceed_status (0); |
9f976b41 | 3112 | |
ca005067 | 3113 | target_last_wait_ptid = minus_one_ptid; |
237fc4c9 | 3114 | |
842951eb | 3115 | previous_inferior_ptid = inferior_ptid; |
c906108c | 3116 | } |
237fc4c9 | 3117 | |
c906108c | 3118 | \f |
488f131b | 3119 | |
ec9499be | 3120 | static void handle_inferior_event (struct execution_control_state *ecs); |
cd0fc7c3 | 3121 | |
568d6575 UW |
3122 | static void handle_step_into_function (struct gdbarch *gdbarch, |
3123 | struct execution_control_state *ecs); | |
3124 | static void handle_step_into_function_backward (struct gdbarch *gdbarch, | |
3125 | struct execution_control_state *ecs); | |
4f5d7f63 | 3126 | static void handle_signal_stop (struct execution_control_state *ecs); |
186c406b | 3127 | static void check_exception_resume (struct execution_control_state *, |
28106bc2 | 3128 | struct frame_info *); |
611c83ae | 3129 | |
bdc36728 | 3130 | static void end_stepping_range (struct execution_control_state *ecs); |
22bcd14b | 3131 | static void stop_waiting (struct execution_control_state *ecs); |
d4f3574e | 3132 | static void keep_going (struct execution_control_state *ecs); |
94c57d6a | 3133 | static void process_event_stop_test (struct execution_control_state *ecs); |
c447ac0b | 3134 | static int switch_back_to_stepped_thread (struct execution_control_state *ecs); |
104c1213 | 3135 | |
252fbfc8 PA |
3136 | /* This function is attached as a "thread_stop_requested" observer. |
3137 | Cleanup local state that assumed the PTID was to be resumed, and | |
3138 | report the stop to the frontend. */ | |
3139 | ||
2c0b251b | 3140 | static void |
252fbfc8 PA |
3141 | infrun_thread_stop_requested (ptid_t ptid) |
3142 | { | |
c65d6b55 PA |
3143 | /* PTID was requested to stop. If the thread was already stopped, |
3144 | but the user/frontend doesn't know about that yet (e.g., the | |
3145 | thread had been temporarily paused for some step-over), set up | |
3146 | for reporting the stop now. */ | |
08036331 PA |
3147 | for (thread_info *tp : all_threads (ptid)) |
3148 | { | |
3149 | if (tp->state != THREAD_RUNNING) | |
3150 | continue; | |
3151 | if (tp->executing) | |
3152 | continue; | |
c65d6b55 | 3153 | |
08036331 PA |
3154 | /* Remove matching threads from the step-over queue, so |
3155 | start_step_over doesn't try to resume them | |
3156 | automatically. */ | |
3157 | if (thread_is_in_step_over_chain (tp)) | |
3158 | thread_step_over_chain_remove (tp); | |
c65d6b55 | 3159 | |
08036331 PA |
3160 | /* If the thread is stopped, but the user/frontend doesn't |
3161 | know about that yet, queue a pending event, as if the | |
3162 | thread had just stopped now. Unless the thread already had | |
3163 | a pending event. */ | |
3164 | if (!tp->suspend.waitstatus_pending_p) | |
3165 | { | |
3166 | tp->suspend.waitstatus_pending_p = 1; | |
3167 | tp->suspend.waitstatus.kind = TARGET_WAITKIND_STOPPED; | |
3168 | tp->suspend.waitstatus.value.sig = GDB_SIGNAL_0; | |
3169 | } | |
c65d6b55 | 3170 | |
08036331 PA |
3171 | /* Clear the inline-frame state, since we're re-processing the |
3172 | stop. */ | |
3173 | clear_inline_frame_state (tp->ptid); | |
c65d6b55 | 3174 | |
08036331 PA |
3175 | /* If this thread was paused because some other thread was |
3176 | doing an inline-step over, let that finish first. Once | |
3177 | that happens, we'll restart all threads and consume pending | |
3178 | stop events then. */ | |
3179 | if (step_over_info_valid_p ()) | |
3180 | continue; | |
3181 | ||
3182 | /* Otherwise we can process the (new) pending event now. Set | |
3183 | it so this pending event is considered by | |
3184 | do_target_wait. */ | |
3185 | tp->resumed = 1; | |
3186 | } | |
252fbfc8 PA |
3187 | } |
3188 | ||
a07daef3 PA |
3189 | static void |
3190 | infrun_thread_thread_exit (struct thread_info *tp, int silent) | |
3191 | { | |
d7e15655 | 3192 | if (target_last_wait_ptid == tp->ptid) |
a07daef3 PA |
3193 | nullify_last_target_wait_ptid (); |
3194 | } | |
3195 | ||
0cbcdb96 PA |
3196 | /* Delete the step resume, single-step and longjmp/exception resume |
3197 | breakpoints of TP. */ | |
4e1c45ea | 3198 | |
0cbcdb96 PA |
3199 | static void |
3200 | delete_thread_infrun_breakpoints (struct thread_info *tp) | |
4e1c45ea | 3201 | { |
0cbcdb96 PA |
3202 | delete_step_resume_breakpoint (tp); |
3203 | delete_exception_resume_breakpoint (tp); | |
34b7e8a6 | 3204 | delete_single_step_breakpoints (tp); |
4e1c45ea PA |
3205 | } |
3206 | ||
0cbcdb96 PA |
3207 | /* If the target still has execution, call FUNC for each thread that |
3208 | just stopped. In all-stop, that's all the non-exited threads; in | |
3209 | non-stop, that's the current thread, only. */ | |
3210 | ||
3211 | typedef void (*for_each_just_stopped_thread_callback_func) | |
3212 | (struct thread_info *tp); | |
4e1c45ea PA |
3213 | |
3214 | static void | |
0cbcdb96 | 3215 | for_each_just_stopped_thread (for_each_just_stopped_thread_callback_func func) |
4e1c45ea | 3216 | { |
d7e15655 | 3217 | if (!target_has_execution || inferior_ptid == null_ptid) |
4e1c45ea PA |
3218 | return; |
3219 | ||
fbea99ea | 3220 | if (target_is_non_stop_p ()) |
4e1c45ea | 3221 | { |
0cbcdb96 PA |
3222 | /* If in non-stop mode, only the current thread stopped. */ |
3223 | func (inferior_thread ()); | |
4e1c45ea PA |
3224 | } |
3225 | else | |
0cbcdb96 | 3226 | { |
0cbcdb96 | 3227 | /* In all-stop mode, all threads have stopped. */ |
08036331 PA |
3228 | for (thread_info *tp : all_non_exited_threads ()) |
3229 | func (tp); | |
0cbcdb96 PA |
3230 | } |
3231 | } | |
3232 | ||
3233 | /* Delete the step resume and longjmp/exception resume breakpoints of | |
3234 | the threads that just stopped. */ | |
3235 | ||
3236 | static void | |
3237 | delete_just_stopped_threads_infrun_breakpoints (void) | |
3238 | { | |
3239 | for_each_just_stopped_thread (delete_thread_infrun_breakpoints); | |
34b7e8a6 PA |
3240 | } |
3241 | ||
3242 | /* Delete the single-step breakpoints of the threads that just | |
3243 | stopped. */ | |
7c16b83e | 3244 | |
34b7e8a6 PA |
3245 | static void |
3246 | delete_just_stopped_threads_single_step_breakpoints (void) | |
3247 | { | |
3248 | for_each_just_stopped_thread (delete_single_step_breakpoints); | |
4e1c45ea PA |
3249 | } |
3250 | ||
221e1a37 | 3251 | /* See infrun.h. */ |
223698f8 | 3252 | |
221e1a37 | 3253 | void |
223698f8 DE |
3254 | print_target_wait_results (ptid_t waiton_ptid, ptid_t result_ptid, |
3255 | const struct target_waitstatus *ws) | |
3256 | { | |
23fdd69e | 3257 | std::string status_string = target_waitstatus_to_string (ws); |
d7e74731 | 3258 | string_file stb; |
223698f8 DE |
3259 | |
3260 | /* The text is split over several lines because it was getting too long. | |
3261 | Call fprintf_unfiltered (gdb_stdlog) once so that the text is still | |
3262 | output as a unit; we want only one timestamp printed if debug_timestamp | |
3263 | is set. */ | |
3264 | ||
d7e74731 | 3265 | stb.printf ("infrun: target_wait (%d.%ld.%ld", |
e99b03dc | 3266 | waiton_ptid.pid (), |
e38504b3 | 3267 | waiton_ptid.lwp (), |
cc6bcb54 | 3268 | waiton_ptid.tid ()); |
e99b03dc | 3269 | if (waiton_ptid.pid () != -1) |
d7e74731 PA |
3270 | stb.printf (" [%s]", target_pid_to_str (waiton_ptid)); |
3271 | stb.printf (", status) =\n"); | |
3272 | stb.printf ("infrun: %d.%ld.%ld [%s],\n", | |
e99b03dc | 3273 | result_ptid.pid (), |
e38504b3 | 3274 | result_ptid.lwp (), |
cc6bcb54 | 3275 | result_ptid.tid (), |
d7e74731 | 3276 | target_pid_to_str (result_ptid)); |
23fdd69e | 3277 | stb.printf ("infrun: %s\n", status_string.c_str ()); |
223698f8 DE |
3278 | |
3279 | /* This uses %s in part to handle %'s in the text, but also to avoid | |
3280 | a gcc error: the format attribute requires a string literal. */ | |
d7e74731 | 3281 | fprintf_unfiltered (gdb_stdlog, "%s", stb.c_str ()); |
223698f8 DE |
3282 | } |
3283 | ||
372316f1 PA |
3284 | /* Select a thread at random, out of those which are resumed and have |
3285 | had events. */ | |
3286 | ||
3287 | static struct thread_info * | |
3288 | random_pending_event_thread (ptid_t waiton_ptid) | |
3289 | { | |
372316f1 | 3290 | int num_events = 0; |
08036331 PA |
3291 | |
3292 | auto has_event = [] (thread_info *tp) | |
3293 | { | |
3294 | return (tp->resumed | |
3295 | && tp->suspend.waitstatus_pending_p); | |
3296 | }; | |
372316f1 PA |
3297 | |
3298 | /* First see how many events we have. Count only resumed threads | |
3299 | that have an event pending. */ | |
08036331 PA |
3300 | for (thread_info *tp : all_non_exited_threads (waiton_ptid)) |
3301 | if (has_event (tp)) | |
372316f1 PA |
3302 | num_events++; |
3303 | ||
3304 | if (num_events == 0) | |
3305 | return NULL; | |
3306 | ||
3307 | /* Now randomly pick a thread out of those that have had events. */ | |
08036331 PA |
3308 | int random_selector = (int) ((num_events * (double) rand ()) |
3309 | / (RAND_MAX + 1.0)); | |
372316f1 PA |
3310 | |
3311 | if (debug_infrun && num_events > 1) | |
3312 | fprintf_unfiltered (gdb_stdlog, | |
3313 | "infrun: Found %d events, selecting #%d\n", | |
3314 | num_events, random_selector); | |
3315 | ||
3316 | /* Select the Nth thread that has had an event. */ | |
08036331 PA |
3317 | for (thread_info *tp : all_non_exited_threads (waiton_ptid)) |
3318 | if (has_event (tp)) | |
372316f1 | 3319 | if (random_selector-- == 0) |
08036331 | 3320 | return tp; |
372316f1 | 3321 | |
08036331 | 3322 | gdb_assert_not_reached ("event thread not found"); |
372316f1 PA |
3323 | } |
3324 | ||
3325 | /* Wrapper for target_wait that first checks whether threads have | |
3326 | pending statuses to report before actually asking the target for | |
3327 | more events. */ | |
3328 | ||
3329 | static ptid_t | |
3330 | do_target_wait (ptid_t ptid, struct target_waitstatus *status, int options) | |
3331 | { | |
3332 | ptid_t event_ptid; | |
3333 | struct thread_info *tp; | |
3334 | ||
3335 | /* First check if there is a resumed thread with a wait status | |
3336 | pending. */ | |
d7e15655 | 3337 | if (ptid == minus_one_ptid || ptid.is_pid ()) |
372316f1 PA |
3338 | { |
3339 | tp = random_pending_event_thread (ptid); | |
3340 | } | |
3341 | else | |
3342 | { | |
3343 | if (debug_infrun) | |
3344 | fprintf_unfiltered (gdb_stdlog, | |
3345 | "infrun: Waiting for specific thread %s.\n", | |
3346 | target_pid_to_str (ptid)); | |
3347 | ||
3348 | /* We have a specific thread to check. */ | |
3349 | tp = find_thread_ptid (ptid); | |
3350 | gdb_assert (tp != NULL); | |
3351 | if (!tp->suspend.waitstatus_pending_p) | |
3352 | tp = NULL; | |
3353 | } | |
3354 | ||
3355 | if (tp != NULL | |
3356 | && (tp->suspend.stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT | |
3357 | || tp->suspend.stop_reason == TARGET_STOPPED_BY_HW_BREAKPOINT)) | |
3358 | { | |
00431a78 | 3359 | struct regcache *regcache = get_thread_regcache (tp); |
ac7936df | 3360 | struct gdbarch *gdbarch = regcache->arch (); |
372316f1 PA |
3361 | CORE_ADDR pc; |
3362 | int discard = 0; | |
3363 | ||
3364 | pc = regcache_read_pc (regcache); | |
3365 | ||
3366 | if (pc != tp->suspend.stop_pc) | |
3367 | { | |
3368 | if (debug_infrun) | |
3369 | fprintf_unfiltered (gdb_stdlog, | |
3370 | "infrun: PC of %s changed. was=%s, now=%s\n", | |
3371 | target_pid_to_str (tp->ptid), | |
defd2172 | 3372 | paddress (gdbarch, tp->suspend.stop_pc), |
372316f1 PA |
3373 | paddress (gdbarch, pc)); |
3374 | discard = 1; | |
3375 | } | |
a01bda52 | 3376 | else if (!breakpoint_inserted_here_p (regcache->aspace (), pc)) |
372316f1 PA |
3377 | { |
3378 | if (debug_infrun) | |
3379 | fprintf_unfiltered (gdb_stdlog, | |
3380 | "infrun: previous breakpoint of %s, at %s gone\n", | |
3381 | target_pid_to_str (tp->ptid), | |
3382 | paddress (gdbarch, pc)); | |
3383 | ||
3384 | discard = 1; | |
3385 | } | |
3386 | ||
3387 | if (discard) | |
3388 | { | |
3389 | if (debug_infrun) | |
3390 | fprintf_unfiltered (gdb_stdlog, | |
3391 | "infrun: pending event of %s cancelled.\n", | |
3392 | target_pid_to_str (tp->ptid)); | |
3393 | ||
3394 | tp->suspend.waitstatus.kind = TARGET_WAITKIND_SPURIOUS; | |
3395 | tp->suspend.stop_reason = TARGET_STOPPED_BY_NO_REASON; | |
3396 | } | |
3397 | } | |
3398 | ||
3399 | if (tp != NULL) | |
3400 | { | |
3401 | if (debug_infrun) | |
3402 | { | |
23fdd69e SM |
3403 | std::string statstr |
3404 | = target_waitstatus_to_string (&tp->suspend.waitstatus); | |
372316f1 | 3405 | |
372316f1 PA |
3406 | fprintf_unfiltered (gdb_stdlog, |
3407 | "infrun: Using pending wait status %s for %s.\n", | |
23fdd69e | 3408 | statstr.c_str (), |
372316f1 | 3409 | target_pid_to_str (tp->ptid)); |
372316f1 PA |
3410 | } |
3411 | ||
3412 | /* Now that we've selected our final event LWP, un-adjust its PC | |
3413 | if it was a software breakpoint (and the target doesn't | |
3414 | always adjust the PC itself). */ | |
3415 | if (tp->suspend.stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT | |
3416 | && !target_supports_stopped_by_sw_breakpoint ()) | |
3417 | { | |
3418 | struct regcache *regcache; | |
3419 | struct gdbarch *gdbarch; | |
3420 | int decr_pc; | |
3421 | ||
00431a78 | 3422 | regcache = get_thread_regcache (tp); |
ac7936df | 3423 | gdbarch = regcache->arch (); |
372316f1 PA |
3424 | |
3425 | decr_pc = gdbarch_decr_pc_after_break (gdbarch); | |
3426 | if (decr_pc != 0) | |
3427 | { | |
3428 | CORE_ADDR pc; | |
3429 | ||
3430 | pc = regcache_read_pc (regcache); | |
3431 | regcache_write_pc (regcache, pc + decr_pc); | |
3432 | } | |
3433 | } | |
3434 | ||
3435 | tp->suspend.stop_reason = TARGET_STOPPED_BY_NO_REASON; | |
3436 | *status = tp->suspend.waitstatus; | |
3437 | tp->suspend.waitstatus_pending_p = 0; | |
3438 | ||
3439 | /* Wake up the event loop again, until all pending events are | |
3440 | processed. */ | |
3441 | if (target_is_async_p ()) | |
3442 | mark_async_event_handler (infrun_async_inferior_event_token); | |
3443 | return tp->ptid; | |
3444 | } | |
3445 | ||
3446 | /* But if we don't find one, we'll have to wait. */ | |
3447 | ||
3448 | if (deprecated_target_wait_hook) | |
3449 | event_ptid = deprecated_target_wait_hook (ptid, status, options); | |
3450 | else | |
3451 | event_ptid = target_wait (ptid, status, options); | |
3452 | ||
3453 | return event_ptid; | |
3454 | } | |
3455 | ||
24291992 PA |
3456 | /* Prepare and stabilize the inferior for detaching it. E.g., |
3457 | detaching while a thread is displaced stepping is a recipe for | |
3458 | crashing it, as nothing would readjust the PC out of the scratch | |
3459 | pad. */ | |
3460 | ||
3461 | void | |
3462 | prepare_for_detach (void) | |
3463 | { | |
3464 | struct inferior *inf = current_inferior (); | |
f2907e49 | 3465 | ptid_t pid_ptid = ptid_t (inf->pid); |
24291992 | 3466 | |
00431a78 | 3467 | displaced_step_inferior_state *displaced = get_displaced_stepping_state (inf); |
24291992 PA |
3468 | |
3469 | /* Is any thread of this process displaced stepping? If not, | |
3470 | there's nothing else to do. */ | |
d20172fc | 3471 | if (displaced->step_thread == nullptr) |
24291992 PA |
3472 | return; |
3473 | ||
3474 | if (debug_infrun) | |
3475 | fprintf_unfiltered (gdb_stdlog, | |
3476 | "displaced-stepping in-process while detaching"); | |
3477 | ||
9bcb1f16 | 3478 | scoped_restore restore_detaching = make_scoped_restore (&inf->detaching, true); |
24291992 | 3479 | |
00431a78 | 3480 | while (displaced->step_thread != nullptr) |
24291992 | 3481 | { |
24291992 PA |
3482 | struct execution_control_state ecss; |
3483 | struct execution_control_state *ecs; | |
3484 | ||
3485 | ecs = &ecss; | |
3486 | memset (ecs, 0, sizeof (*ecs)); | |
3487 | ||
3488 | overlay_cache_invalid = 1; | |
f15cb84a YQ |
3489 | /* Flush target cache before starting to handle each event. |
3490 | Target was running and cache could be stale. This is just a | |
3491 | heuristic. Running threads may modify target memory, but we | |
3492 | don't get any event. */ | |
3493 | target_dcache_invalidate (); | |
24291992 | 3494 | |
372316f1 | 3495 | ecs->ptid = do_target_wait (pid_ptid, &ecs->ws, 0); |
24291992 PA |
3496 | |
3497 | if (debug_infrun) | |
3498 | print_target_wait_results (pid_ptid, ecs->ptid, &ecs->ws); | |
3499 | ||
3500 | /* If an error happens while handling the event, propagate GDB's | |
3501 | knowledge of the executing state to the frontend/user running | |
3502 | state. */ | |
731f534f | 3503 | scoped_finish_thread_state finish_state (minus_one_ptid); |
24291992 PA |
3504 | |
3505 | /* Now figure out what to do with the result of the result. */ | |
3506 | handle_inferior_event (ecs); | |
3507 | ||
3508 | /* No error, don't finish the state yet. */ | |
731f534f | 3509 | finish_state.release (); |
24291992 PA |
3510 | |
3511 | /* Breakpoints and watchpoints are not installed on the target | |
3512 | at this point, and signals are passed directly to the | |
3513 | inferior, so this must mean the process is gone. */ | |
3514 | if (!ecs->wait_some_more) | |
3515 | { | |
9bcb1f16 | 3516 | restore_detaching.release (); |
24291992 PA |
3517 | error (_("Program exited while detaching")); |
3518 | } | |
3519 | } | |
3520 | ||
9bcb1f16 | 3521 | restore_detaching.release (); |
24291992 PA |
3522 | } |
3523 | ||
cd0fc7c3 | 3524 | /* Wait for control to return from inferior to debugger. |
ae123ec6 | 3525 | |
cd0fc7c3 SS |
3526 | If inferior gets a signal, we may decide to start it up again |
3527 | instead of returning. That is why there is a loop in this function. | |
3528 | When this function actually returns it means the inferior | |
3529 | should be left stopped and GDB should read more commands. */ | |
3530 | ||
3531 | void | |
e4c8541f | 3532 | wait_for_inferior (void) |
cd0fc7c3 | 3533 | { |
527159b7 | 3534 | if (debug_infrun) |
ae123ec6 | 3535 | fprintf_unfiltered |
e4c8541f | 3536 | (gdb_stdlog, "infrun: wait_for_inferior ()\n"); |
527159b7 | 3537 | |
4c41382a | 3538 | SCOPE_EXIT { delete_just_stopped_threads_infrun_breakpoints (); }; |
cd0fc7c3 | 3539 | |
e6f5c25b PA |
3540 | /* If an error happens while handling the event, propagate GDB's |
3541 | knowledge of the executing state to the frontend/user running | |
3542 | state. */ | |
731f534f | 3543 | scoped_finish_thread_state finish_state (minus_one_ptid); |
e6f5c25b | 3544 | |
c906108c SS |
3545 | while (1) |
3546 | { | |
ae25568b PA |
3547 | struct execution_control_state ecss; |
3548 | struct execution_control_state *ecs = &ecss; | |
963f9c80 | 3549 | ptid_t waiton_ptid = minus_one_ptid; |
29f49a6a | 3550 | |
ae25568b PA |
3551 | memset (ecs, 0, sizeof (*ecs)); |
3552 | ||
ec9499be | 3553 | overlay_cache_invalid = 1; |
ec9499be | 3554 | |
f15cb84a YQ |
3555 | /* Flush target cache before starting to handle each event. |
3556 | Target was running and cache could be stale. This is just a | |
3557 | heuristic. Running threads may modify target memory, but we | |
3558 | don't get any event. */ | |
3559 | target_dcache_invalidate (); | |
3560 | ||
372316f1 | 3561 | ecs->ptid = do_target_wait (waiton_ptid, &ecs->ws, 0); |
c906108c | 3562 | |
f00150c9 | 3563 | if (debug_infrun) |
223698f8 | 3564 | print_target_wait_results (waiton_ptid, ecs->ptid, &ecs->ws); |
f00150c9 | 3565 | |
cd0fc7c3 SS |
3566 | /* Now figure out what to do with the result of the result. */ |
3567 | handle_inferior_event (ecs); | |
c906108c | 3568 | |
cd0fc7c3 SS |
3569 | if (!ecs->wait_some_more) |
3570 | break; | |
3571 | } | |
4e1c45ea | 3572 | |
e6f5c25b | 3573 | /* No error, don't finish the state yet. */ |
731f534f | 3574 | finish_state.release (); |
cd0fc7c3 | 3575 | } |
c906108c | 3576 | |
d3d4baed PA |
3577 | /* Cleanup that reinstalls the readline callback handler, if the |
3578 | target is running in the background. If while handling the target | |
3579 | event something triggered a secondary prompt, like e.g., a | |
3580 | pagination prompt, we'll have removed the callback handler (see | |
3581 | gdb_readline_wrapper_line). Need to do this as we go back to the | |
3582 | event loop, ready to process further input. Note this has no | |
3583 | effect if the handler hasn't actually been removed, because calling | |
3584 | rl_callback_handler_install resets the line buffer, thus losing | |
3585 | input. */ | |
3586 | ||
3587 | static void | |
3588 | reinstall_readline_callback_handler_cleanup (void *arg) | |
3589 | { | |
3b12939d PA |
3590 | struct ui *ui = current_ui; |
3591 | ||
3592 | if (!ui->async) | |
6c400b59 PA |
3593 | { |
3594 | /* We're not going back to the top level event loop yet. Don't | |
3595 | install the readline callback, as it'd prep the terminal, | |
3596 | readline-style (raw, noecho) (e.g., --batch). We'll install | |
3597 | it the next time the prompt is displayed, when we're ready | |
3598 | for input. */ | |
3599 | return; | |
3600 | } | |
3601 | ||
3b12939d | 3602 | if (ui->command_editing && ui->prompt_state != PROMPT_BLOCKED) |
d3d4baed PA |
3603 | gdb_rl_callback_handler_reinstall (); |
3604 | } | |
3605 | ||
243a9253 PA |
3606 | /* Clean up the FSMs of threads that are now stopped. In non-stop, |
3607 | that's just the event thread. In all-stop, that's all threads. */ | |
3608 | ||
3609 | static void | |
3610 | clean_up_just_stopped_threads_fsms (struct execution_control_state *ecs) | |
3611 | { | |
08036331 PA |
3612 | if (ecs->event_thread != NULL |
3613 | && ecs->event_thread->thread_fsm != NULL) | |
3614 | thread_fsm_clean_up (ecs->event_thread->thread_fsm, | |
3615 | ecs->event_thread); | |
243a9253 PA |
3616 | |
3617 | if (!non_stop) | |
3618 | { | |
08036331 | 3619 | for (thread_info *thr : all_non_exited_threads ()) |
243a9253 PA |
3620 | { |
3621 | if (thr->thread_fsm == NULL) | |
3622 | continue; | |
3623 | if (thr == ecs->event_thread) | |
3624 | continue; | |
3625 | ||
00431a78 | 3626 | switch_to_thread (thr); |
8980e177 | 3627 | thread_fsm_clean_up (thr->thread_fsm, thr); |
243a9253 PA |
3628 | } |
3629 | ||
3630 | if (ecs->event_thread != NULL) | |
00431a78 | 3631 | switch_to_thread (ecs->event_thread); |
243a9253 PA |
3632 | } |
3633 | } | |
3634 | ||
3b12939d PA |
3635 | /* Helper for all_uis_check_sync_execution_done that works on the |
3636 | current UI. */ | |
3637 | ||
3638 | static void | |
3639 | check_curr_ui_sync_execution_done (void) | |
3640 | { | |
3641 | struct ui *ui = current_ui; | |
3642 | ||
3643 | if (ui->prompt_state == PROMPT_NEEDED | |
3644 | && ui->async | |
3645 | && !gdb_in_secondary_prompt_p (ui)) | |
3646 | { | |
223ffa71 | 3647 | target_terminal::ours (); |
76727919 | 3648 | gdb::observers::sync_execution_done.notify (); |
3eb7562a | 3649 | ui_register_input_event_handler (ui); |
3b12939d PA |
3650 | } |
3651 | } | |
3652 | ||
3653 | /* See infrun.h. */ | |
3654 | ||
3655 | void | |
3656 | all_uis_check_sync_execution_done (void) | |
3657 | { | |
0e454242 | 3658 | SWITCH_THRU_ALL_UIS () |
3b12939d PA |
3659 | { |
3660 | check_curr_ui_sync_execution_done (); | |
3661 | } | |
3662 | } | |
3663 | ||
a8836c93 PA |
3664 | /* See infrun.h. */ |
3665 | ||
3666 | void | |
3667 | all_uis_on_sync_execution_starting (void) | |
3668 | { | |
0e454242 | 3669 | SWITCH_THRU_ALL_UIS () |
a8836c93 PA |
3670 | { |
3671 | if (current_ui->prompt_state == PROMPT_NEEDED) | |
3672 | async_disable_stdin (); | |
3673 | } | |
3674 | } | |
3675 | ||
1777feb0 | 3676 | /* Asynchronous version of wait_for_inferior. It is called by the |
43ff13b4 | 3677 | event loop whenever a change of state is detected on the file |
1777feb0 MS |
3678 | descriptor corresponding to the target. It can be called more than |
3679 | once to complete a single execution command. In such cases we need | |
3680 | to keep the state in a global variable ECSS. If it is the last time | |
a474d7c2 PA |
3681 | that this function is called for a single execution command, then |
3682 | report to the user that the inferior has stopped, and do the | |
1777feb0 | 3683 | necessary cleanups. */ |
43ff13b4 JM |
3684 | |
3685 | void | |
fba45db2 | 3686 | fetch_inferior_event (void *client_data) |
43ff13b4 | 3687 | { |
0d1e5fa7 | 3688 | struct execution_control_state ecss; |
a474d7c2 | 3689 | struct execution_control_state *ecs = &ecss; |
4f8d22e3 | 3690 | struct cleanup *old_chain = make_cleanup (null_cleanup, NULL); |
0f641c01 | 3691 | int cmd_done = 0; |
963f9c80 | 3692 | ptid_t waiton_ptid = minus_one_ptid; |
43ff13b4 | 3693 | |
0d1e5fa7 PA |
3694 | memset (ecs, 0, sizeof (*ecs)); |
3695 | ||
c61db772 PA |
3696 | /* Events are always processed with the main UI as current UI. This |
3697 | way, warnings, debug output, etc. are always consistently sent to | |
3698 | the main console. */ | |
4b6749b9 | 3699 | scoped_restore save_ui = make_scoped_restore (¤t_ui, main_ui); |
c61db772 | 3700 | |
d3d4baed PA |
3701 | /* End up with readline processing input, if necessary. */ |
3702 | make_cleanup (reinstall_readline_callback_handler_cleanup, NULL); | |
3703 | ||
c5187ac6 PA |
3704 | /* We're handling a live event, so make sure we're doing live |
3705 | debugging. If we're looking at traceframes while the target is | |
3706 | running, we're going to need to get back to that mode after | |
3707 | handling the event. */ | |
6f14adc5 | 3708 | gdb::optional<scoped_restore_current_traceframe> maybe_restore_traceframe; |
c5187ac6 PA |
3709 | if (non_stop) |
3710 | { | |
6f14adc5 | 3711 | maybe_restore_traceframe.emplace (); |
e6e4e701 | 3712 | set_current_traceframe (-1); |
c5187ac6 PA |
3713 | } |
3714 | ||
5ed8105e PA |
3715 | gdb::optional<scoped_restore_current_thread> maybe_restore_thread; |
3716 | ||
4f8d22e3 PA |
3717 | if (non_stop) |
3718 | /* In non-stop mode, the user/frontend should not notice a thread | |
3719 | switch due to internal events. Make sure we reverse to the | |
3720 | user selected thread and frame after handling the event and | |
3721 | running any breakpoint commands. */ | |
5ed8105e | 3722 | maybe_restore_thread.emplace (); |
4f8d22e3 | 3723 | |
ec9499be | 3724 | overlay_cache_invalid = 1; |
f15cb84a YQ |
3725 | /* Flush target cache before starting to handle each event. Target |
3726 | was running and cache could be stale. This is just a heuristic. | |
3727 | Running threads may modify target memory, but we don't get any | |
3728 | event. */ | |
3729 | target_dcache_invalidate (); | |
3dd5b83d | 3730 | |
b7b633e9 TT |
3731 | scoped_restore save_exec_dir |
3732 | = make_scoped_restore (&execution_direction, target_execution_direction ()); | |
32231432 | 3733 | |
0b333c5e PA |
3734 | ecs->ptid = do_target_wait (waiton_ptid, &ecs->ws, |
3735 | target_can_async_p () ? TARGET_WNOHANG : 0); | |
43ff13b4 | 3736 | |
f00150c9 | 3737 | if (debug_infrun) |
223698f8 | 3738 | print_target_wait_results (waiton_ptid, ecs->ptid, &ecs->ws); |
f00150c9 | 3739 | |
29f49a6a PA |
3740 | /* If an error happens while handling the event, propagate GDB's |
3741 | knowledge of the executing state to the frontend/user running | |
3742 | state. */ | |
731f534f PA |
3743 | ptid_t finish_ptid = !target_is_non_stop_p () ? minus_one_ptid : ecs->ptid; |
3744 | scoped_finish_thread_state finish_state (finish_ptid); | |
29f49a6a | 3745 | |
353d1d73 JK |
3746 | /* Get executed before make_cleanup_restore_current_thread above to apply |
3747 | still for the thread which has thrown the exception. */ | |
694c6bf5 TT |
3748 | auto defer_bpstat_clear |
3749 | = make_scope_exit (bpstat_clear_actions); | |
4c41382a TT |
3750 | auto defer_delete_threads |
3751 | = make_scope_exit (delete_just_stopped_threads_infrun_breakpoints); | |
7c16b83e | 3752 | |
43ff13b4 | 3753 | /* Now figure out what to do with the result of the result. */ |
a474d7c2 | 3754 | handle_inferior_event (ecs); |
43ff13b4 | 3755 | |
a474d7c2 | 3756 | if (!ecs->wait_some_more) |
43ff13b4 | 3757 | { |
c9657e70 | 3758 | struct inferior *inf = find_inferior_ptid (ecs->ptid); |
243a9253 PA |
3759 | int should_stop = 1; |
3760 | struct thread_info *thr = ecs->event_thread; | |
d6b48e9c | 3761 | |
0cbcdb96 | 3762 | delete_just_stopped_threads_infrun_breakpoints (); |
f107f563 | 3763 | |
243a9253 PA |
3764 | if (thr != NULL) |
3765 | { | |
3766 | struct thread_fsm *thread_fsm = thr->thread_fsm; | |
3767 | ||
3768 | if (thread_fsm != NULL) | |
8980e177 | 3769 | should_stop = thread_fsm_should_stop (thread_fsm, thr); |
243a9253 PA |
3770 | } |
3771 | ||
3772 | if (!should_stop) | |
3773 | { | |
3774 | keep_going (ecs); | |
3775 | } | |
c2d11a7d | 3776 | else |
0f641c01 | 3777 | { |
1840d81a AB |
3778 | int should_notify_stop = 1; |
3779 | int proceeded = 0; | |
3780 | ||
243a9253 PA |
3781 | clean_up_just_stopped_threads_fsms (ecs); |
3782 | ||
388a7084 PA |
3783 | if (thr != NULL && thr->thread_fsm != NULL) |
3784 | { | |
3785 | should_notify_stop | |
3786 | = thread_fsm_should_notify_stop (thr->thread_fsm); | |
3787 | } | |
3788 | ||
3789 | if (should_notify_stop) | |
3790 | { | |
3791 | /* We may not find an inferior if this was a process exit. */ | |
3792 | if (inf == NULL || inf->control.stop_soon == NO_STOP_QUIETLY) | |
4c2f2a79 | 3793 | proceeded = normal_stop (); |
1840d81a | 3794 | } |
243a9253 | 3795 | |
1840d81a AB |
3796 | if (!proceeded) |
3797 | { | |
3798 | inferior_event_handler (INF_EXEC_COMPLETE, NULL); | |
3799 | cmd_done = 1; | |
388a7084 | 3800 | } |
0f641c01 | 3801 | } |
43ff13b4 | 3802 | } |
4f8d22e3 | 3803 | |
4c41382a | 3804 | defer_delete_threads.release (); |
694c6bf5 | 3805 | defer_bpstat_clear.release (); |
29f49a6a | 3806 | |
731f534f PA |
3807 | /* No error, don't finish the thread states yet. */ |
3808 | finish_state.release (); | |
3809 | ||
4f8d22e3 PA |
3810 | /* Revert thread and frame. */ |
3811 | do_cleanups (old_chain); | |
3812 | ||
3b12939d PA |
3813 | /* If a UI was in sync execution mode, and now isn't, restore its |
3814 | prompt (a synchronous execution command has finished, and we're | |
3815 | ready for input). */ | |
3816 | all_uis_check_sync_execution_done (); | |
0f641c01 PA |
3817 | |
3818 | if (cmd_done | |
0f641c01 | 3819 | && exec_done_display_p |
00431a78 PA |
3820 | && (inferior_ptid == null_ptid |
3821 | || inferior_thread ()->state != THREAD_RUNNING)) | |
0f641c01 | 3822 | printf_unfiltered (_("completed.\n")); |
43ff13b4 JM |
3823 | } |
3824 | ||
edb3359d DJ |
3825 | /* Record the frame and location we're currently stepping through. */ |
3826 | void | |
3827 | set_step_info (struct frame_info *frame, struct symtab_and_line sal) | |
3828 | { | |
3829 | struct thread_info *tp = inferior_thread (); | |
3830 | ||
16c381f0 JK |
3831 | tp->control.step_frame_id = get_frame_id (frame); |
3832 | tp->control.step_stack_frame_id = get_stack_frame_id (frame); | |
edb3359d DJ |
3833 | |
3834 | tp->current_symtab = sal.symtab; | |
3835 | tp->current_line = sal.line; | |
3836 | } | |
3837 | ||
0d1e5fa7 PA |
3838 | /* Clear context switchable stepping state. */ |
3839 | ||
3840 | void | |
4e1c45ea | 3841 | init_thread_stepping_state (struct thread_info *tss) |
0d1e5fa7 | 3842 | { |
7f5ef605 | 3843 | tss->stepped_breakpoint = 0; |
0d1e5fa7 | 3844 | tss->stepping_over_breakpoint = 0; |
963f9c80 | 3845 | tss->stepping_over_watchpoint = 0; |
0d1e5fa7 | 3846 | tss->step_after_step_resume_breakpoint = 0; |
cd0fc7c3 SS |
3847 | } |
3848 | ||
c32c64b7 DE |
3849 | /* Set the cached copy of the last ptid/waitstatus. */ |
3850 | ||
6efcd9a8 | 3851 | void |
c32c64b7 DE |
3852 | set_last_target_status (ptid_t ptid, struct target_waitstatus status) |
3853 | { | |
3854 | target_last_wait_ptid = ptid; | |
3855 | target_last_waitstatus = status; | |
3856 | } | |
3857 | ||
e02bc4cc | 3858 | /* Return the cached copy of the last pid/waitstatus returned by |
9a4105ab AC |
3859 | target_wait()/deprecated_target_wait_hook(). The data is actually |
3860 | cached by handle_inferior_event(), which gets called immediately | |
3861 | after target_wait()/deprecated_target_wait_hook(). */ | |
e02bc4cc DS |
3862 | |
3863 | void | |
488f131b | 3864 | get_last_target_status (ptid_t *ptidp, struct target_waitstatus *status) |
e02bc4cc | 3865 | { |
39f77062 | 3866 | *ptidp = target_last_wait_ptid; |
e02bc4cc DS |
3867 | *status = target_last_waitstatus; |
3868 | } | |
3869 | ||
ac264b3b MS |
3870 | void |
3871 | nullify_last_target_wait_ptid (void) | |
3872 | { | |
3873 | target_last_wait_ptid = minus_one_ptid; | |
3874 | } | |
3875 | ||
dcf4fbde | 3876 | /* Switch thread contexts. */ |
dd80620e MS |
3877 | |
3878 | static void | |
00431a78 | 3879 | context_switch (execution_control_state *ecs) |
dd80620e | 3880 | { |
00431a78 PA |
3881 | if (debug_infrun |
3882 | && ecs->ptid != inferior_ptid | |
3883 | && ecs->event_thread != inferior_thread ()) | |
fd48f117 DJ |
3884 | { |
3885 | fprintf_unfiltered (gdb_stdlog, "infrun: Switching context from %s ", | |
3886 | target_pid_to_str (inferior_ptid)); | |
3887 | fprintf_unfiltered (gdb_stdlog, "to %s\n", | |
00431a78 | 3888 | target_pid_to_str (ecs->ptid)); |
fd48f117 DJ |
3889 | } |
3890 | ||
00431a78 | 3891 | switch_to_thread (ecs->event_thread); |
dd80620e MS |
3892 | } |
3893 | ||
d8dd4d5f PA |
3894 | /* If the target can't tell whether we've hit breakpoints |
3895 | (target_supports_stopped_by_sw_breakpoint), and we got a SIGTRAP, | |
3896 | check whether that could have been caused by a breakpoint. If so, | |
3897 | adjust the PC, per gdbarch_decr_pc_after_break. */ | |
3898 | ||
4fa8626c | 3899 | static void |
d8dd4d5f PA |
3900 | adjust_pc_after_break (struct thread_info *thread, |
3901 | struct target_waitstatus *ws) | |
4fa8626c | 3902 | { |
24a73cce UW |
3903 | struct regcache *regcache; |
3904 | struct gdbarch *gdbarch; | |
118e6252 | 3905 | CORE_ADDR breakpoint_pc, decr_pc; |
4fa8626c | 3906 | |
4fa8626c DJ |
3907 | /* If we've hit a breakpoint, we'll normally be stopped with SIGTRAP. If |
3908 | we aren't, just return. | |
9709f61c DJ |
3909 | |
3910 | We assume that waitkinds other than TARGET_WAITKIND_STOPPED are not | |
b798847d UW |
3911 | affected by gdbarch_decr_pc_after_break. Other waitkinds which are |
3912 | implemented by software breakpoints should be handled through the normal | |
3913 | breakpoint layer. | |
8fb3e588 | 3914 | |
4fa8626c DJ |
3915 | NOTE drow/2004-01-31: On some targets, breakpoints may generate |
3916 | different signals (SIGILL or SIGEMT for instance), but it is less | |
3917 | clear where the PC is pointing afterwards. It may not match | |
b798847d UW |
3918 | gdbarch_decr_pc_after_break. I don't know any specific target that |
3919 | generates these signals at breakpoints (the code has been in GDB since at | |
3920 | least 1992) so I can not guess how to handle them here. | |
8fb3e588 | 3921 | |
e6cf7916 UW |
3922 | In earlier versions of GDB, a target with |
3923 | gdbarch_have_nonsteppable_watchpoint would have the PC after hitting a | |
b798847d UW |
3924 | watchpoint affected by gdbarch_decr_pc_after_break. I haven't found any |
3925 | target with both of these set in GDB history, and it seems unlikely to be | |
3926 | correct, so gdbarch_have_nonsteppable_watchpoint is not checked here. */ | |
4fa8626c | 3927 | |
d8dd4d5f | 3928 | if (ws->kind != TARGET_WAITKIND_STOPPED) |
4fa8626c DJ |
3929 | return; |
3930 | ||
d8dd4d5f | 3931 | if (ws->value.sig != GDB_SIGNAL_TRAP) |
4fa8626c DJ |
3932 | return; |
3933 | ||
4058b839 PA |
3934 | /* In reverse execution, when a breakpoint is hit, the instruction |
3935 | under it has already been de-executed. The reported PC always | |
3936 | points at the breakpoint address, so adjusting it further would | |
3937 | be wrong. E.g., consider this case on a decr_pc_after_break == 1 | |
3938 | architecture: | |
3939 | ||
3940 | B1 0x08000000 : INSN1 | |
3941 | B2 0x08000001 : INSN2 | |
3942 | 0x08000002 : INSN3 | |
3943 | PC -> 0x08000003 : INSN4 | |
3944 | ||
3945 | Say you're stopped at 0x08000003 as above. Reverse continuing | |
3946 | from that point should hit B2 as below. Reading the PC when the | |
3947 | SIGTRAP is reported should read 0x08000001 and INSN2 should have | |
3948 | been de-executed already. | |
3949 | ||
3950 | B1 0x08000000 : INSN1 | |
3951 | B2 PC -> 0x08000001 : INSN2 | |
3952 | 0x08000002 : INSN3 | |
3953 | 0x08000003 : INSN4 | |
3954 | ||
3955 | We can't apply the same logic as for forward execution, because | |
3956 | we would wrongly adjust the PC to 0x08000000, since there's a | |
3957 | breakpoint at PC - 1. We'd then report a hit on B1, although | |
3958 | INSN1 hadn't been de-executed yet. Doing nothing is the correct | |
3959 | behaviour. */ | |
3960 | if (execution_direction == EXEC_REVERSE) | |
3961 | return; | |
3962 | ||
1cf4d951 PA |
3963 | /* If the target can tell whether the thread hit a SW breakpoint, |
3964 | trust it. Targets that can tell also adjust the PC | |
3965 | themselves. */ | |
3966 | if (target_supports_stopped_by_sw_breakpoint ()) | |
3967 | return; | |
3968 | ||
3969 | /* Note that relying on whether a breakpoint is planted in memory to | |
3970 | determine this can fail. E.g,. the breakpoint could have been | |
3971 | removed since. Or the thread could have been told to step an | |
3972 | instruction the size of a breakpoint instruction, and only | |
3973 | _after_ was a breakpoint inserted at its address. */ | |
3974 | ||
24a73cce UW |
3975 | /* If this target does not decrement the PC after breakpoints, then |
3976 | we have nothing to do. */ | |
00431a78 | 3977 | regcache = get_thread_regcache (thread); |
ac7936df | 3978 | gdbarch = regcache->arch (); |
118e6252 | 3979 | |
527a273a | 3980 | decr_pc = gdbarch_decr_pc_after_break (gdbarch); |
118e6252 | 3981 | if (decr_pc == 0) |
24a73cce UW |
3982 | return; |
3983 | ||
8b86c959 | 3984 | const address_space *aspace = regcache->aspace (); |
6c95b8df | 3985 | |
8aad930b AC |
3986 | /* Find the location where (if we've hit a breakpoint) the |
3987 | breakpoint would be. */ | |
118e6252 | 3988 | breakpoint_pc = regcache_read_pc (regcache) - decr_pc; |
8aad930b | 3989 | |
1cf4d951 PA |
3990 | /* If the target can't tell whether a software breakpoint triggered, |
3991 | fallback to figuring it out based on breakpoints we think were | |
3992 | inserted in the target, and on whether the thread was stepped or | |
3993 | continued. */ | |
3994 | ||
1c5cfe86 PA |
3995 | /* Check whether there actually is a software breakpoint inserted at |
3996 | that location. | |
3997 | ||
3998 | If in non-stop mode, a race condition is possible where we've | |
3999 | removed a breakpoint, but stop events for that breakpoint were | |
4000 | already queued and arrive later. To suppress those spurious | |
4001 | SIGTRAPs, we keep a list of such breakpoint locations for a bit, | |
1cf4d951 PA |
4002 | and retire them after a number of stop events are reported. Note |
4003 | this is an heuristic and can thus get confused. The real fix is | |
4004 | to get the "stopped by SW BP and needs adjustment" info out of | |
4005 | the target/kernel (and thus never reach here; see above). */ | |
6c95b8df | 4006 | if (software_breakpoint_inserted_here_p (aspace, breakpoint_pc) |
fbea99ea PA |
4007 | || (target_is_non_stop_p () |
4008 | && moribund_breakpoint_here_p (aspace, breakpoint_pc))) | |
8aad930b | 4009 | { |
07036511 | 4010 | gdb::optional<scoped_restore_tmpl<int>> restore_operation_disable; |
abbb1732 | 4011 | |
8213266a | 4012 | if (record_full_is_used ()) |
07036511 TT |
4013 | restore_operation_disable.emplace |
4014 | (record_full_gdb_operation_disable_set ()); | |
96429cc8 | 4015 | |
1c0fdd0e UW |
4016 | /* When using hardware single-step, a SIGTRAP is reported for both |
4017 | a completed single-step and a software breakpoint. Need to | |
4018 | differentiate between the two, as the latter needs adjusting | |
4019 | but the former does not. | |
4020 | ||
4021 | The SIGTRAP can be due to a completed hardware single-step only if | |
4022 | - we didn't insert software single-step breakpoints | |
1c0fdd0e UW |
4023 | - this thread is currently being stepped |
4024 | ||
4025 | If any of these events did not occur, we must have stopped due | |
4026 | to hitting a software breakpoint, and have to back up to the | |
4027 | breakpoint address. | |
4028 | ||
4029 | As a special case, we could have hardware single-stepped a | |
4030 | software breakpoint. In this case (prev_pc == breakpoint_pc), | |
4031 | we also need to back up to the breakpoint address. */ | |
4032 | ||
d8dd4d5f PA |
4033 | if (thread_has_single_step_breakpoints_set (thread) |
4034 | || !currently_stepping (thread) | |
4035 | || (thread->stepped_breakpoint | |
4036 | && thread->prev_pc == breakpoint_pc)) | |
515630c5 | 4037 | regcache_write_pc (regcache, breakpoint_pc); |
8aad930b | 4038 | } |
4fa8626c DJ |
4039 | } |
4040 | ||
edb3359d DJ |
4041 | static int |
4042 | stepped_in_from (struct frame_info *frame, struct frame_id step_frame_id) | |
4043 | { | |
4044 | for (frame = get_prev_frame (frame); | |
4045 | frame != NULL; | |
4046 | frame = get_prev_frame (frame)) | |
4047 | { | |
4048 | if (frame_id_eq (get_frame_id (frame), step_frame_id)) | |
4049 | return 1; | |
4050 | if (get_frame_type (frame) != INLINE_FRAME) | |
4051 | break; | |
4052 | } | |
4053 | ||
4054 | return 0; | |
4055 | } | |
4056 | ||
c65d6b55 PA |
4057 | /* If the event thread has the stop requested flag set, pretend it |
4058 | stopped for a GDB_SIGNAL_0 (i.e., as if it stopped due to | |
4059 | target_stop). */ | |
4060 | ||
4061 | static bool | |
4062 | handle_stop_requested (struct execution_control_state *ecs) | |
4063 | { | |
4064 | if (ecs->event_thread->stop_requested) | |
4065 | { | |
4066 | ecs->ws.kind = TARGET_WAITKIND_STOPPED; | |
4067 | ecs->ws.value.sig = GDB_SIGNAL_0; | |
4068 | handle_signal_stop (ecs); | |
4069 | return true; | |
4070 | } | |
4071 | return false; | |
4072 | } | |
4073 | ||
a96d9b2e SDJ |
4074 | /* Auxiliary function that handles syscall entry/return events. |
4075 | It returns 1 if the inferior should keep going (and GDB | |
4076 | should ignore the event), or 0 if the event deserves to be | |
4077 | processed. */ | |
ca2163eb | 4078 | |
a96d9b2e | 4079 | static int |
ca2163eb | 4080 | handle_syscall_event (struct execution_control_state *ecs) |
a96d9b2e | 4081 | { |
ca2163eb | 4082 | struct regcache *regcache; |
ca2163eb PA |
4083 | int syscall_number; |
4084 | ||
00431a78 | 4085 | context_switch (ecs); |
ca2163eb | 4086 | |
00431a78 | 4087 | regcache = get_thread_regcache (ecs->event_thread); |
f90263c1 | 4088 | syscall_number = ecs->ws.value.syscall_number; |
f2ffa92b | 4089 | ecs->event_thread->suspend.stop_pc = regcache_read_pc (regcache); |
ca2163eb | 4090 | |
a96d9b2e SDJ |
4091 | if (catch_syscall_enabled () > 0 |
4092 | && catching_syscall_number (syscall_number) > 0) | |
4093 | { | |
4094 | if (debug_infrun) | |
4095 | fprintf_unfiltered (gdb_stdlog, "infrun: syscall number = '%d'\n", | |
4096 | syscall_number); | |
a96d9b2e | 4097 | |
16c381f0 | 4098 | ecs->event_thread->control.stop_bpstat |
a01bda52 | 4099 | = bpstat_stop_status (regcache->aspace (), |
f2ffa92b PA |
4100 | ecs->event_thread->suspend.stop_pc, |
4101 | ecs->event_thread, &ecs->ws); | |
ab04a2af | 4102 | |
c65d6b55 PA |
4103 | if (handle_stop_requested (ecs)) |
4104 | return 0; | |
4105 | ||
ce12b012 | 4106 | if (bpstat_causes_stop (ecs->event_thread->control.stop_bpstat)) |
ca2163eb PA |
4107 | { |
4108 | /* Catchpoint hit. */ | |
ca2163eb PA |
4109 | return 0; |
4110 | } | |
a96d9b2e | 4111 | } |
ca2163eb | 4112 | |
c65d6b55 PA |
4113 | if (handle_stop_requested (ecs)) |
4114 | return 0; | |
4115 | ||
ca2163eb | 4116 | /* If no catchpoint triggered for this, then keep going. */ |
ca2163eb PA |
4117 | keep_going (ecs); |
4118 | return 1; | |
a96d9b2e SDJ |
4119 | } |
4120 | ||
7e324e48 GB |
4121 | /* Lazily fill in the execution_control_state's stop_func_* fields. */ |
4122 | ||
4123 | static void | |
4124 | fill_in_stop_func (struct gdbarch *gdbarch, | |
4125 | struct execution_control_state *ecs) | |
4126 | { | |
4127 | if (!ecs->stop_func_filled_in) | |
4128 | { | |
4129 | /* Don't care about return value; stop_func_start and stop_func_name | |
4130 | will both be 0 if it doesn't work. */ | |
59adbf5d KB |
4131 | find_function_entry_range_from_pc (ecs->event_thread->suspend.stop_pc, |
4132 | &ecs->stop_func_name, | |
4133 | &ecs->stop_func_start, | |
4134 | &ecs->stop_func_end); | |
7e324e48 GB |
4135 | ecs->stop_func_start |
4136 | += gdbarch_deprecated_function_start_offset (gdbarch); | |
4137 | ||
591a12a1 UW |
4138 | if (gdbarch_skip_entrypoint_p (gdbarch)) |
4139 | ecs->stop_func_start = gdbarch_skip_entrypoint (gdbarch, | |
4140 | ecs->stop_func_start); | |
4141 | ||
7e324e48 GB |
4142 | ecs->stop_func_filled_in = 1; |
4143 | } | |
4144 | } | |
4145 | ||
4f5d7f63 | 4146 | |
00431a78 | 4147 | /* Return the STOP_SOON field of the inferior pointed at by ECS. */ |
4f5d7f63 PA |
4148 | |
4149 | static enum stop_kind | |
00431a78 | 4150 | get_inferior_stop_soon (execution_control_state *ecs) |
4f5d7f63 | 4151 | { |
00431a78 | 4152 | struct inferior *inf = find_inferior_ptid (ecs->ptid); |
4f5d7f63 PA |
4153 | |
4154 | gdb_assert (inf != NULL); | |
4155 | return inf->control.stop_soon; | |
4156 | } | |
4157 | ||
372316f1 PA |
4158 | /* Wait for one event. Store the resulting waitstatus in WS, and |
4159 | return the event ptid. */ | |
4160 | ||
4161 | static ptid_t | |
4162 | wait_one (struct target_waitstatus *ws) | |
4163 | { | |
4164 | ptid_t event_ptid; | |
4165 | ptid_t wait_ptid = minus_one_ptid; | |
4166 | ||
4167 | overlay_cache_invalid = 1; | |
4168 | ||
4169 | /* Flush target cache before starting to handle each event. | |
4170 | Target was running and cache could be stale. This is just a | |
4171 | heuristic. Running threads may modify target memory, but we | |
4172 | don't get any event. */ | |
4173 | target_dcache_invalidate (); | |
4174 | ||
4175 | if (deprecated_target_wait_hook) | |
4176 | event_ptid = deprecated_target_wait_hook (wait_ptid, ws, 0); | |
4177 | else | |
4178 | event_ptid = target_wait (wait_ptid, ws, 0); | |
4179 | ||
4180 | if (debug_infrun) | |
4181 | print_target_wait_results (wait_ptid, event_ptid, ws); | |
4182 | ||
4183 | return event_ptid; | |
4184 | } | |
4185 | ||
4186 | /* Generate a wrapper for target_stopped_by_REASON that works on PTID | |
4187 | instead of the current thread. */ | |
4188 | #define THREAD_STOPPED_BY(REASON) \ | |
4189 | static int \ | |
4190 | thread_stopped_by_ ## REASON (ptid_t ptid) \ | |
4191 | { \ | |
2989a365 | 4192 | scoped_restore save_inferior_ptid = make_scoped_restore (&inferior_ptid); \ |
372316f1 PA |
4193 | inferior_ptid = ptid; \ |
4194 | \ | |
2989a365 | 4195 | return target_stopped_by_ ## REASON (); \ |
372316f1 PA |
4196 | } |
4197 | ||
4198 | /* Generate thread_stopped_by_watchpoint. */ | |
4199 | THREAD_STOPPED_BY (watchpoint) | |
4200 | /* Generate thread_stopped_by_sw_breakpoint. */ | |
4201 | THREAD_STOPPED_BY (sw_breakpoint) | |
4202 | /* Generate thread_stopped_by_hw_breakpoint. */ | |
4203 | THREAD_STOPPED_BY (hw_breakpoint) | |
4204 | ||
372316f1 PA |
4205 | /* Save the thread's event and stop reason to process it later. */ |
4206 | ||
4207 | static void | |
4208 | save_waitstatus (struct thread_info *tp, struct target_waitstatus *ws) | |
4209 | { | |
372316f1 PA |
4210 | if (debug_infrun) |
4211 | { | |
23fdd69e | 4212 | std::string statstr = target_waitstatus_to_string (ws); |
372316f1 | 4213 | |
372316f1 PA |
4214 | fprintf_unfiltered (gdb_stdlog, |
4215 | "infrun: saving status %s for %d.%ld.%ld\n", | |
23fdd69e | 4216 | statstr.c_str (), |
e99b03dc | 4217 | tp->ptid.pid (), |
e38504b3 | 4218 | tp->ptid.lwp (), |
cc6bcb54 | 4219 | tp->ptid.tid ()); |
372316f1 PA |
4220 | } |
4221 | ||
4222 | /* Record for later. */ | |
4223 | tp->suspend.waitstatus = *ws; | |
4224 | tp->suspend.waitstatus_pending_p = 1; | |
4225 | ||
00431a78 | 4226 | struct regcache *regcache = get_thread_regcache (tp); |
8b86c959 | 4227 | const address_space *aspace = regcache->aspace (); |
372316f1 PA |
4228 | |
4229 | if (ws->kind == TARGET_WAITKIND_STOPPED | |
4230 | && ws->value.sig == GDB_SIGNAL_TRAP) | |
4231 | { | |
4232 | CORE_ADDR pc = regcache_read_pc (regcache); | |
4233 | ||
4234 | adjust_pc_after_break (tp, &tp->suspend.waitstatus); | |
4235 | ||
4236 | if (thread_stopped_by_watchpoint (tp->ptid)) | |
4237 | { | |
4238 | tp->suspend.stop_reason | |
4239 | = TARGET_STOPPED_BY_WATCHPOINT; | |
4240 | } | |
4241 | else if (target_supports_stopped_by_sw_breakpoint () | |
4242 | && thread_stopped_by_sw_breakpoint (tp->ptid)) | |
4243 | { | |
4244 | tp->suspend.stop_reason | |
4245 | = TARGET_STOPPED_BY_SW_BREAKPOINT; | |
4246 | } | |
4247 | else if (target_supports_stopped_by_hw_breakpoint () | |
4248 | && thread_stopped_by_hw_breakpoint (tp->ptid)) | |
4249 | { | |
4250 | tp->suspend.stop_reason | |
4251 | = TARGET_STOPPED_BY_HW_BREAKPOINT; | |
4252 | } | |
4253 | else if (!target_supports_stopped_by_hw_breakpoint () | |
4254 | && hardware_breakpoint_inserted_here_p (aspace, | |
4255 | pc)) | |
4256 | { | |
4257 | tp->suspend.stop_reason | |
4258 | = TARGET_STOPPED_BY_HW_BREAKPOINT; | |
4259 | } | |
4260 | else if (!target_supports_stopped_by_sw_breakpoint () | |
4261 | && software_breakpoint_inserted_here_p (aspace, | |
4262 | pc)) | |
4263 | { | |
4264 | tp->suspend.stop_reason | |
4265 | = TARGET_STOPPED_BY_SW_BREAKPOINT; | |
4266 | } | |
4267 | else if (!thread_has_single_step_breakpoints_set (tp) | |
4268 | && currently_stepping (tp)) | |
4269 | { | |
4270 | tp->suspend.stop_reason | |
4271 | = TARGET_STOPPED_BY_SINGLE_STEP; | |
4272 | } | |
4273 | } | |
4274 | } | |
4275 | ||
65706a29 PA |
4276 | /* A cleanup that disables thread create/exit events. */ |
4277 | ||
4278 | static void | |
4279 | disable_thread_events (void *arg) | |
4280 | { | |
4281 | target_thread_events (0); | |
4282 | } | |
4283 | ||
6efcd9a8 | 4284 | /* See infrun.h. */ |
372316f1 | 4285 | |
6efcd9a8 | 4286 | void |
372316f1 PA |
4287 | stop_all_threads (void) |
4288 | { | |
4289 | /* We may need multiple passes to discover all threads. */ | |
4290 | int pass; | |
4291 | int iterations = 0; | |
372316f1 PA |
4292 | struct cleanup *old_chain; |
4293 | ||
fbea99ea | 4294 | gdb_assert (target_is_non_stop_p ()); |
372316f1 PA |
4295 | |
4296 | if (debug_infrun) | |
4297 | fprintf_unfiltered (gdb_stdlog, "infrun: stop_all_threads\n"); | |
4298 | ||
00431a78 | 4299 | scoped_restore_current_thread restore_thread; |
372316f1 | 4300 | |
65706a29 | 4301 | target_thread_events (1); |
00431a78 | 4302 | old_chain = make_cleanup (disable_thread_events, NULL); |
65706a29 | 4303 | |
372316f1 PA |
4304 | /* Request threads to stop, and then wait for the stops. Because |
4305 | threads we already know about can spawn more threads while we're | |
4306 | trying to stop them, and we only learn about new threads when we | |
4307 | update the thread list, do this in a loop, and keep iterating | |
4308 | until two passes find no threads that need to be stopped. */ | |
4309 | for (pass = 0; pass < 2; pass++, iterations++) | |
4310 | { | |
4311 | if (debug_infrun) | |
4312 | fprintf_unfiltered (gdb_stdlog, | |
4313 | "infrun: stop_all_threads, pass=%d, " | |
4314 | "iterations=%d\n", pass, iterations); | |
4315 | while (1) | |
4316 | { | |
4317 | ptid_t event_ptid; | |
4318 | struct target_waitstatus ws; | |
4319 | int need_wait = 0; | |
372316f1 PA |
4320 | |
4321 | update_thread_list (); | |
4322 | ||
4323 | /* Go through all threads looking for threads that we need | |
4324 | to tell the target to stop. */ | |
08036331 | 4325 | for (thread_info *t : all_non_exited_threads ()) |
372316f1 PA |
4326 | { |
4327 | if (t->executing) | |
4328 | { | |
4329 | /* If already stopping, don't request a stop again. | |
4330 | We just haven't seen the notification yet. */ | |
4331 | if (!t->stop_requested) | |
4332 | { | |
4333 | if (debug_infrun) | |
4334 | fprintf_unfiltered (gdb_stdlog, | |
4335 | "infrun: %s executing, " | |
4336 | "need stop\n", | |
4337 | target_pid_to_str (t->ptid)); | |
4338 | target_stop (t->ptid); | |
4339 | t->stop_requested = 1; | |
4340 | } | |
4341 | else | |
4342 | { | |
4343 | if (debug_infrun) | |
4344 | fprintf_unfiltered (gdb_stdlog, | |
4345 | "infrun: %s executing, " | |
4346 | "already stopping\n", | |
4347 | target_pid_to_str (t->ptid)); | |
4348 | } | |
4349 | ||
4350 | if (t->stop_requested) | |
4351 | need_wait = 1; | |
4352 | } | |
4353 | else | |
4354 | { | |
4355 | if (debug_infrun) | |
4356 | fprintf_unfiltered (gdb_stdlog, | |
4357 | "infrun: %s not executing\n", | |
4358 | target_pid_to_str (t->ptid)); | |
4359 | ||
4360 | /* The thread may be not executing, but still be | |
4361 | resumed with a pending status to process. */ | |
4362 | t->resumed = 0; | |
4363 | } | |
4364 | } | |
4365 | ||
4366 | if (!need_wait) | |
4367 | break; | |
4368 | ||
4369 | /* If we find new threads on the second iteration, restart | |
4370 | over. We want to see two iterations in a row with all | |
4371 | threads stopped. */ | |
4372 | if (pass > 0) | |
4373 | pass = -1; | |
4374 | ||
4375 | event_ptid = wait_one (&ws); | |
00431a78 | 4376 | |
372316f1 PA |
4377 | if (ws.kind == TARGET_WAITKIND_NO_RESUMED) |
4378 | { | |
4379 | /* All resumed threads exited. */ | |
4380 | } | |
65706a29 PA |
4381 | else if (ws.kind == TARGET_WAITKIND_THREAD_EXITED |
4382 | || ws.kind == TARGET_WAITKIND_EXITED | |
372316f1 PA |
4383 | || ws.kind == TARGET_WAITKIND_SIGNALLED) |
4384 | { | |
4385 | if (debug_infrun) | |
4386 | { | |
f2907e49 | 4387 | ptid_t ptid = ptid_t (ws.value.integer); |
372316f1 PA |
4388 | |
4389 | fprintf_unfiltered (gdb_stdlog, | |
4390 | "infrun: %s exited while " | |
4391 | "stopping threads\n", | |
4392 | target_pid_to_str (ptid)); | |
4393 | } | |
4394 | } | |
4395 | else | |
4396 | { | |
08036331 | 4397 | thread_info *t = find_thread_ptid (event_ptid); |
372316f1 PA |
4398 | if (t == NULL) |
4399 | t = add_thread (event_ptid); | |
4400 | ||
4401 | t->stop_requested = 0; | |
4402 | t->executing = 0; | |
4403 | t->resumed = 0; | |
4404 | t->control.may_range_step = 0; | |
4405 | ||
6efcd9a8 PA |
4406 | /* This may be the first time we see the inferior report |
4407 | a stop. */ | |
08036331 | 4408 | inferior *inf = find_inferior_ptid (event_ptid); |
6efcd9a8 PA |
4409 | if (inf->needs_setup) |
4410 | { | |
4411 | switch_to_thread_no_regs (t); | |
4412 | setup_inferior (0); | |
4413 | } | |
4414 | ||
372316f1 PA |
4415 | if (ws.kind == TARGET_WAITKIND_STOPPED |
4416 | && ws.value.sig == GDB_SIGNAL_0) | |
4417 | { | |
4418 | /* We caught the event that we intended to catch, so | |
4419 | there's no event pending. */ | |
4420 | t->suspend.waitstatus.kind = TARGET_WAITKIND_IGNORE; | |
4421 | t->suspend.waitstatus_pending_p = 0; | |
4422 | ||
00431a78 | 4423 | if (displaced_step_fixup (t, GDB_SIGNAL_0) < 0) |
372316f1 PA |
4424 | { |
4425 | /* Add it back to the step-over queue. */ | |
4426 | if (debug_infrun) | |
4427 | { | |
4428 | fprintf_unfiltered (gdb_stdlog, | |
4429 | "infrun: displaced-step of %s " | |
4430 | "canceled: adding back to the " | |
4431 | "step-over queue\n", | |
4432 | target_pid_to_str (t->ptid)); | |
4433 | } | |
4434 | t->control.trap_expected = 0; | |
4435 | thread_step_over_chain_enqueue (t); | |
4436 | } | |
4437 | } | |
4438 | else | |
4439 | { | |
4440 | enum gdb_signal sig; | |
4441 | struct regcache *regcache; | |
372316f1 PA |
4442 | |
4443 | if (debug_infrun) | |
4444 | { | |
23fdd69e | 4445 | std::string statstr = target_waitstatus_to_string (&ws); |
372316f1 | 4446 | |
372316f1 PA |
4447 | fprintf_unfiltered (gdb_stdlog, |
4448 | "infrun: target_wait %s, saving " | |
4449 | "status for %d.%ld.%ld\n", | |
23fdd69e | 4450 | statstr.c_str (), |
e99b03dc | 4451 | t->ptid.pid (), |
e38504b3 | 4452 | t->ptid.lwp (), |
cc6bcb54 | 4453 | t->ptid.tid ()); |
372316f1 PA |
4454 | } |
4455 | ||
4456 | /* Record for later. */ | |
4457 | save_waitstatus (t, &ws); | |
4458 | ||
4459 | sig = (ws.kind == TARGET_WAITKIND_STOPPED | |
4460 | ? ws.value.sig : GDB_SIGNAL_0); | |
4461 | ||
00431a78 | 4462 | if (displaced_step_fixup (t, sig) < 0) |
372316f1 PA |
4463 | { |
4464 | /* Add it back to the step-over queue. */ | |
4465 | t->control.trap_expected = 0; | |
4466 | thread_step_over_chain_enqueue (t); | |
4467 | } | |
4468 | ||
00431a78 | 4469 | regcache = get_thread_regcache (t); |
372316f1 PA |
4470 | t->suspend.stop_pc = regcache_read_pc (regcache); |
4471 | ||
4472 | if (debug_infrun) | |
4473 | { | |
4474 | fprintf_unfiltered (gdb_stdlog, | |
4475 | "infrun: saved stop_pc=%s for %s " | |
4476 | "(currently_stepping=%d)\n", | |
4477 | paddress (target_gdbarch (), | |
4478 | t->suspend.stop_pc), | |
4479 | target_pid_to_str (t->ptid), | |
4480 | currently_stepping (t)); | |
4481 | } | |
4482 | } | |
4483 | } | |
4484 | } | |
4485 | } | |
4486 | ||
4487 | do_cleanups (old_chain); | |
4488 | ||
4489 | if (debug_infrun) | |
4490 | fprintf_unfiltered (gdb_stdlog, "infrun: stop_all_threads done\n"); | |
4491 | } | |
4492 | ||
f4836ba9 PA |
4493 | /* Handle a TARGET_WAITKIND_NO_RESUMED event. */ |
4494 | ||
4495 | static int | |
4496 | handle_no_resumed (struct execution_control_state *ecs) | |
4497 | { | |
3b12939d | 4498 | if (target_can_async_p ()) |
f4836ba9 | 4499 | { |
3b12939d PA |
4500 | struct ui *ui; |
4501 | int any_sync = 0; | |
f4836ba9 | 4502 | |
3b12939d PA |
4503 | ALL_UIS (ui) |
4504 | { | |
4505 | if (ui->prompt_state == PROMPT_BLOCKED) | |
4506 | { | |
4507 | any_sync = 1; | |
4508 | break; | |
4509 | } | |
4510 | } | |
4511 | if (!any_sync) | |
4512 | { | |
4513 | /* There were no unwaited-for children left in the target, but, | |
4514 | we're not synchronously waiting for events either. Just | |
4515 | ignore. */ | |
4516 | ||
4517 | if (debug_infrun) | |
4518 | fprintf_unfiltered (gdb_stdlog, | |
4519 | "infrun: TARGET_WAITKIND_NO_RESUMED " | |
4520 | "(ignoring: bg)\n"); | |
4521 | prepare_to_wait (ecs); | |
4522 | return 1; | |
4523 | } | |
f4836ba9 PA |
4524 | } |
4525 | ||
4526 | /* Otherwise, if we were running a synchronous execution command, we | |
4527 | may need to cancel it and give the user back the terminal. | |
4528 | ||
4529 | In non-stop mode, the target can't tell whether we've already | |
4530 | consumed previous stop events, so it can end up sending us a | |
4531 | no-resumed event like so: | |
4532 | ||
4533 | #0 - thread 1 is left stopped | |
4534 | ||
4535 | #1 - thread 2 is resumed and hits breakpoint | |
4536 | -> TARGET_WAITKIND_STOPPED | |
4537 | ||
4538 | #2 - thread 3 is resumed and exits | |
4539 | this is the last resumed thread, so | |
4540 | -> TARGET_WAITKIND_NO_RESUMED | |
4541 | ||
4542 | #3 - gdb processes stop for thread 2 and decides to re-resume | |
4543 | it. | |
4544 | ||
4545 | #4 - gdb processes the TARGET_WAITKIND_NO_RESUMED event. | |
4546 | thread 2 is now resumed, so the event should be ignored. | |
4547 | ||
4548 | IOW, if the stop for thread 2 doesn't end a foreground command, | |
4549 | then we need to ignore the following TARGET_WAITKIND_NO_RESUMED | |
4550 | event. But it could be that the event meant that thread 2 itself | |
4551 | (or whatever other thread was the last resumed thread) exited. | |
4552 | ||
4553 | To address this we refresh the thread list and check whether we | |
4554 | have resumed threads _now_. In the example above, this removes | |
4555 | thread 3 from the thread list. If thread 2 was re-resumed, we | |
4556 | ignore this event. If we find no thread resumed, then we cancel | |
4557 | the synchronous command show "no unwaited-for " to the user. */ | |
4558 | update_thread_list (); | |
4559 | ||
08036331 | 4560 | for (thread_info *thread : all_non_exited_threads ()) |
f4836ba9 PA |
4561 | { |
4562 | if (thread->executing | |
4563 | || thread->suspend.waitstatus_pending_p) | |
4564 | { | |
4565 | /* There were no unwaited-for children left in the target at | |
4566 | some point, but there are now. Just ignore. */ | |
4567 | if (debug_infrun) | |
4568 | fprintf_unfiltered (gdb_stdlog, | |
4569 | "infrun: TARGET_WAITKIND_NO_RESUMED " | |
4570 | "(ignoring: found resumed)\n"); | |
4571 | prepare_to_wait (ecs); | |
4572 | return 1; | |
4573 | } | |
4574 | } | |
4575 | ||
4576 | /* Note however that we may find no resumed thread because the whole | |
4577 | process exited meanwhile (thus updating the thread list results | |
4578 | in an empty thread list). In this case we know we'll be getting | |
4579 | a process exit event shortly. */ | |
08036331 | 4580 | for (inferior *inf : all_inferiors ()) |
f4836ba9 PA |
4581 | { |
4582 | if (inf->pid == 0) | |
4583 | continue; | |
4584 | ||
08036331 | 4585 | thread_info *thread = any_live_thread_of_inferior (inf); |
f4836ba9 PA |
4586 | if (thread == NULL) |
4587 | { | |
4588 | if (debug_infrun) | |
4589 | fprintf_unfiltered (gdb_stdlog, | |
4590 | "infrun: TARGET_WAITKIND_NO_RESUMED " | |
4591 | "(expect process exit)\n"); | |
4592 | prepare_to_wait (ecs); | |
4593 | return 1; | |
4594 | } | |
4595 | } | |
4596 | ||
4597 | /* Go ahead and report the event. */ | |
4598 | return 0; | |
4599 | } | |
4600 | ||
05ba8510 PA |
4601 | /* Given an execution control state that has been freshly filled in by |
4602 | an event from the inferior, figure out what it means and take | |
4603 | appropriate action. | |
4604 | ||
4605 | The alternatives are: | |
4606 | ||
22bcd14b | 4607 | 1) stop_waiting and return; to really stop and return to the |
05ba8510 PA |
4608 | debugger. |
4609 | ||
4610 | 2) keep_going and return; to wait for the next event (set | |
4611 | ecs->event_thread->stepping_over_breakpoint to 1 to single step | |
4612 | once). */ | |
c906108c | 4613 | |
ec9499be | 4614 | static void |
0b6e5e10 | 4615 | handle_inferior_event_1 (struct execution_control_state *ecs) |
cd0fc7c3 | 4616 | { |
d6b48e9c PA |
4617 | enum stop_kind stop_soon; |
4618 | ||
28736962 PA |
4619 | if (ecs->ws.kind == TARGET_WAITKIND_IGNORE) |
4620 | { | |
4621 | /* We had an event in the inferior, but we are not interested in | |
4622 | handling it at this level. The lower layers have already | |
4623 | done what needs to be done, if anything. | |
4624 | ||
4625 | One of the possible circumstances for this is when the | |
4626 | inferior produces output for the console. The inferior has | |
4627 | not stopped, and we are ignoring the event. Another possible | |
4628 | circumstance is any event which the lower level knows will be | |
4629 | reported multiple times without an intervening resume. */ | |
4630 | if (debug_infrun) | |
4631 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_IGNORE\n"); | |
4632 | prepare_to_wait (ecs); | |
4633 | return; | |
4634 | } | |
4635 | ||
65706a29 PA |
4636 | if (ecs->ws.kind == TARGET_WAITKIND_THREAD_EXITED) |
4637 | { | |
4638 | if (debug_infrun) | |
4639 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_THREAD_EXITED\n"); | |
4640 | prepare_to_wait (ecs); | |
4641 | return; | |
4642 | } | |
4643 | ||
0e5bf2a8 | 4644 | if (ecs->ws.kind == TARGET_WAITKIND_NO_RESUMED |
f4836ba9 PA |
4645 | && handle_no_resumed (ecs)) |
4646 | return; | |
0e5bf2a8 | 4647 | |
1777feb0 | 4648 | /* Cache the last pid/waitstatus. */ |
c32c64b7 | 4649 | set_last_target_status (ecs->ptid, ecs->ws); |
e02bc4cc | 4650 | |
ca005067 | 4651 | /* Always clear state belonging to the previous time we stopped. */ |
aa7d318d | 4652 | stop_stack_dummy = STOP_NONE; |
ca005067 | 4653 | |
0e5bf2a8 PA |
4654 | if (ecs->ws.kind == TARGET_WAITKIND_NO_RESUMED) |
4655 | { | |
4656 | /* No unwaited-for children left. IOW, all resumed children | |
4657 | have exited. */ | |
4658 | if (debug_infrun) | |
4659 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_NO_RESUMED\n"); | |
4660 | ||
4661 | stop_print_frame = 0; | |
22bcd14b | 4662 | stop_waiting (ecs); |
0e5bf2a8 PA |
4663 | return; |
4664 | } | |
4665 | ||
8c90c137 | 4666 | if (ecs->ws.kind != TARGET_WAITKIND_EXITED |
64776a0b | 4667 | && ecs->ws.kind != TARGET_WAITKIND_SIGNALLED) |
359f5fe6 PA |
4668 | { |
4669 | ecs->event_thread = find_thread_ptid (ecs->ptid); | |
4670 | /* If it's a new thread, add it to the thread database. */ | |
4671 | if (ecs->event_thread == NULL) | |
4672 | ecs->event_thread = add_thread (ecs->ptid); | |
c1e36e3e PA |
4673 | |
4674 | /* Disable range stepping. If the next step request could use a | |
4675 | range, this will be end up re-enabled then. */ | |
4676 | ecs->event_thread->control.may_range_step = 0; | |
359f5fe6 | 4677 | } |
88ed393a JK |
4678 | |
4679 | /* Dependent on valid ECS->EVENT_THREAD. */ | |
d8dd4d5f | 4680 | adjust_pc_after_break (ecs->event_thread, &ecs->ws); |
88ed393a JK |
4681 | |
4682 | /* Dependent on the current PC value modified by adjust_pc_after_break. */ | |
4683 | reinit_frame_cache (); | |
4684 | ||
28736962 PA |
4685 | breakpoint_retire_moribund (); |
4686 | ||
2b009048 DJ |
4687 | /* First, distinguish signals caused by the debugger from signals |
4688 | that have to do with the program's own actions. Note that | |
4689 | breakpoint insns may cause SIGTRAP or SIGILL or SIGEMT, depending | |
4690 | on the operating system version. Here we detect when a SIGILL or | |
4691 | SIGEMT is really a breakpoint and change it to SIGTRAP. We do | |
4692 | something similar for SIGSEGV, since a SIGSEGV will be generated | |
4693 | when we're trying to execute a breakpoint instruction on a | |
4694 | non-executable stack. This happens for call dummy breakpoints | |
4695 | for architectures like SPARC that place call dummies on the | |
4696 | stack. */ | |
2b009048 | 4697 | if (ecs->ws.kind == TARGET_WAITKIND_STOPPED |
a493e3e2 PA |
4698 | && (ecs->ws.value.sig == GDB_SIGNAL_ILL |
4699 | || ecs->ws.value.sig == GDB_SIGNAL_SEGV | |
4700 | || ecs->ws.value.sig == GDB_SIGNAL_EMT)) | |
2b009048 | 4701 | { |
00431a78 | 4702 | struct regcache *regcache = get_thread_regcache (ecs->event_thread); |
de0a0249 | 4703 | |
a01bda52 | 4704 | if (breakpoint_inserted_here_p (regcache->aspace (), |
de0a0249 UW |
4705 | regcache_read_pc (regcache))) |
4706 | { | |
4707 | if (debug_infrun) | |
4708 | fprintf_unfiltered (gdb_stdlog, | |
4709 | "infrun: Treating signal as SIGTRAP\n"); | |
a493e3e2 | 4710 | ecs->ws.value.sig = GDB_SIGNAL_TRAP; |
de0a0249 | 4711 | } |
2b009048 DJ |
4712 | } |
4713 | ||
28736962 PA |
4714 | /* Mark the non-executing threads accordingly. In all-stop, all |
4715 | threads of all processes are stopped when we get any event | |
e1316e60 | 4716 | reported. In non-stop mode, only the event thread stops. */ |
372316f1 PA |
4717 | { |
4718 | ptid_t mark_ptid; | |
4719 | ||
fbea99ea | 4720 | if (!target_is_non_stop_p ()) |
372316f1 PA |
4721 | mark_ptid = minus_one_ptid; |
4722 | else if (ecs->ws.kind == TARGET_WAITKIND_SIGNALLED | |
4723 | || ecs->ws.kind == TARGET_WAITKIND_EXITED) | |
4724 | { | |
4725 | /* If we're handling a process exit in non-stop mode, even | |
4726 | though threads haven't been deleted yet, one would think | |
4727 | that there is nothing to do, as threads of the dead process | |
4728 | will be soon deleted, and threads of any other process were | |
4729 | left running. However, on some targets, threads survive a | |
4730 | process exit event. E.g., for the "checkpoint" command, | |
4731 | when the current checkpoint/fork exits, linux-fork.c | |
4732 | automatically switches to another fork from within | |
4733 | target_mourn_inferior, by associating the same | |
4734 | inferior/thread to another fork. We haven't mourned yet at | |
4735 | this point, but we must mark any threads left in the | |
4736 | process as not-executing so that finish_thread_state marks | |
4737 | them stopped (in the user's perspective) if/when we present | |
4738 | the stop to the user. */ | |
e99b03dc | 4739 | mark_ptid = ptid_t (ecs->ptid.pid ()); |
372316f1 PA |
4740 | } |
4741 | else | |
4742 | mark_ptid = ecs->ptid; | |
4743 | ||
4744 | set_executing (mark_ptid, 0); | |
4745 | ||
4746 | /* Likewise the resumed flag. */ | |
4747 | set_resumed (mark_ptid, 0); | |
4748 | } | |
8c90c137 | 4749 | |
488f131b JB |
4750 | switch (ecs->ws.kind) |
4751 | { | |
4752 | case TARGET_WAITKIND_LOADED: | |
527159b7 | 4753 | if (debug_infrun) |
8a9de0e4 | 4754 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_LOADED\n"); |
00431a78 | 4755 | context_switch (ecs); |
b0f4b84b DJ |
4756 | /* Ignore gracefully during startup of the inferior, as it might |
4757 | be the shell which has just loaded some objects, otherwise | |
4758 | add the symbols for the newly loaded objects. Also ignore at | |
4759 | the beginning of an attach or remote session; we will query | |
4760 | the full list of libraries once the connection is | |
4761 | established. */ | |
4f5d7f63 | 4762 | |
00431a78 | 4763 | stop_soon = get_inferior_stop_soon (ecs); |
c0236d92 | 4764 | if (stop_soon == NO_STOP_QUIETLY) |
488f131b | 4765 | { |
edcc5120 TT |
4766 | struct regcache *regcache; |
4767 | ||
00431a78 | 4768 | regcache = get_thread_regcache (ecs->event_thread); |
edcc5120 TT |
4769 | |
4770 | handle_solib_event (); | |
4771 | ||
4772 | ecs->event_thread->control.stop_bpstat | |
a01bda52 | 4773 | = bpstat_stop_status (regcache->aspace (), |
f2ffa92b PA |
4774 | ecs->event_thread->suspend.stop_pc, |
4775 | ecs->event_thread, &ecs->ws); | |
ab04a2af | 4776 | |
c65d6b55 PA |
4777 | if (handle_stop_requested (ecs)) |
4778 | return; | |
4779 | ||
ce12b012 | 4780 | if (bpstat_causes_stop (ecs->event_thread->control.stop_bpstat)) |
edcc5120 TT |
4781 | { |
4782 | /* A catchpoint triggered. */ | |
94c57d6a PA |
4783 | process_event_stop_test (ecs); |
4784 | return; | |
edcc5120 | 4785 | } |
488f131b | 4786 | |
b0f4b84b DJ |
4787 | /* If requested, stop when the dynamic linker notifies |
4788 | gdb of events. This allows the user to get control | |
4789 | and place breakpoints in initializer routines for | |
4790 | dynamically loaded objects (among other things). */ | |
a493e3e2 | 4791 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; |
b0f4b84b DJ |
4792 | if (stop_on_solib_events) |
4793 | { | |
55409f9d DJ |
4794 | /* Make sure we print "Stopped due to solib-event" in |
4795 | normal_stop. */ | |
4796 | stop_print_frame = 1; | |
4797 | ||
22bcd14b | 4798 | stop_waiting (ecs); |
b0f4b84b DJ |
4799 | return; |
4800 | } | |
488f131b | 4801 | } |
b0f4b84b DJ |
4802 | |
4803 | /* If we are skipping through a shell, or through shared library | |
4804 | loading that we aren't interested in, resume the program. If | |
5c09a2c5 | 4805 | we're running the program normally, also resume. */ |
b0f4b84b DJ |
4806 | if (stop_soon == STOP_QUIETLY || stop_soon == NO_STOP_QUIETLY) |
4807 | { | |
74960c60 VP |
4808 | /* Loading of shared libraries might have changed breakpoint |
4809 | addresses. Make sure new breakpoints are inserted. */ | |
a25a5a45 | 4810 | if (stop_soon == NO_STOP_QUIETLY) |
74960c60 | 4811 | insert_breakpoints (); |
64ce06e4 | 4812 | resume (GDB_SIGNAL_0); |
b0f4b84b DJ |
4813 | prepare_to_wait (ecs); |
4814 | return; | |
4815 | } | |
4816 | ||
5c09a2c5 PA |
4817 | /* But stop if we're attaching or setting up a remote |
4818 | connection. */ | |
4819 | if (stop_soon == STOP_QUIETLY_NO_SIGSTOP | |
4820 | || stop_soon == STOP_QUIETLY_REMOTE) | |
4821 | { | |
4822 | if (debug_infrun) | |
4823 | fprintf_unfiltered (gdb_stdlog, "infrun: quietly stopped\n"); | |
22bcd14b | 4824 | stop_waiting (ecs); |
5c09a2c5 PA |
4825 | return; |
4826 | } | |
4827 | ||
4828 | internal_error (__FILE__, __LINE__, | |
4829 | _("unhandled stop_soon: %d"), (int) stop_soon); | |
c5aa993b | 4830 | |
488f131b | 4831 | case TARGET_WAITKIND_SPURIOUS: |
527159b7 | 4832 | if (debug_infrun) |
8a9de0e4 | 4833 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_SPURIOUS\n"); |
c65d6b55 PA |
4834 | if (handle_stop_requested (ecs)) |
4835 | return; | |
00431a78 | 4836 | context_switch (ecs); |
64ce06e4 | 4837 | resume (GDB_SIGNAL_0); |
488f131b JB |
4838 | prepare_to_wait (ecs); |
4839 | return; | |
c5aa993b | 4840 | |
65706a29 PA |
4841 | case TARGET_WAITKIND_THREAD_CREATED: |
4842 | if (debug_infrun) | |
4843 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_THREAD_CREATED\n"); | |
c65d6b55 PA |
4844 | if (handle_stop_requested (ecs)) |
4845 | return; | |
00431a78 | 4846 | context_switch (ecs); |
65706a29 PA |
4847 | if (!switch_back_to_stepped_thread (ecs)) |
4848 | keep_going (ecs); | |
4849 | return; | |
4850 | ||
488f131b | 4851 | case TARGET_WAITKIND_EXITED: |
940c3c06 | 4852 | case TARGET_WAITKIND_SIGNALLED: |
527159b7 | 4853 | if (debug_infrun) |
940c3c06 PA |
4854 | { |
4855 | if (ecs->ws.kind == TARGET_WAITKIND_EXITED) | |
4856 | fprintf_unfiltered (gdb_stdlog, | |
4857 | "infrun: TARGET_WAITKIND_EXITED\n"); | |
4858 | else | |
4859 | fprintf_unfiltered (gdb_stdlog, | |
4860 | "infrun: TARGET_WAITKIND_SIGNALLED\n"); | |
4861 | } | |
4862 | ||
fb66883a | 4863 | inferior_ptid = ecs->ptid; |
c9657e70 | 4864 | set_current_inferior (find_inferior_ptid (ecs->ptid)); |
6c95b8df PA |
4865 | set_current_program_space (current_inferior ()->pspace); |
4866 | handle_vfork_child_exec_or_exit (0); | |
223ffa71 | 4867 | target_terminal::ours (); /* Must do this before mourn anyway. */ |
488f131b | 4868 | |
0c557179 SDJ |
4869 | /* Clearing any previous state of convenience variables. */ |
4870 | clear_exit_convenience_vars (); | |
4871 | ||
940c3c06 PA |
4872 | if (ecs->ws.kind == TARGET_WAITKIND_EXITED) |
4873 | { | |
4874 | /* Record the exit code in the convenience variable $_exitcode, so | |
4875 | that the user can inspect this again later. */ | |
4876 | set_internalvar_integer (lookup_internalvar ("_exitcode"), | |
4877 | (LONGEST) ecs->ws.value.integer); | |
4878 | ||
4879 | /* Also record this in the inferior itself. */ | |
4880 | current_inferior ()->has_exit_code = 1; | |
4881 | current_inferior ()->exit_code = (LONGEST) ecs->ws.value.integer; | |
8cf64490 | 4882 | |
98eb56a4 PA |
4883 | /* Support the --return-child-result option. */ |
4884 | return_child_result_value = ecs->ws.value.integer; | |
4885 | ||
76727919 | 4886 | gdb::observers::exited.notify (ecs->ws.value.integer); |
940c3c06 PA |
4887 | } |
4888 | else | |
0c557179 | 4889 | { |
00431a78 | 4890 | struct gdbarch *gdbarch = current_inferior ()->gdbarch; |
0c557179 SDJ |
4891 | |
4892 | if (gdbarch_gdb_signal_to_target_p (gdbarch)) | |
4893 | { | |
4894 | /* Set the value of the internal variable $_exitsignal, | |
4895 | which holds the signal uncaught by the inferior. */ | |
4896 | set_internalvar_integer (lookup_internalvar ("_exitsignal"), | |
4897 | gdbarch_gdb_signal_to_target (gdbarch, | |
4898 | ecs->ws.value.sig)); | |
4899 | } | |
4900 | else | |
4901 | { | |
4902 | /* We don't have access to the target's method used for | |
4903 | converting between signal numbers (GDB's internal | |
4904 | representation <-> target's representation). | |
4905 | Therefore, we cannot do a good job at displaying this | |
4906 | information to the user. It's better to just warn | |
4907 | her about it (if infrun debugging is enabled), and | |
4908 | give up. */ | |
4909 | if (debug_infrun) | |
4910 | fprintf_filtered (gdb_stdlog, _("\ | |
4911 | Cannot fill $_exitsignal with the correct signal number.\n")); | |
4912 | } | |
4913 | ||
76727919 | 4914 | gdb::observers::signal_exited.notify (ecs->ws.value.sig); |
0c557179 | 4915 | } |
8cf64490 | 4916 | |
488f131b | 4917 | gdb_flush (gdb_stdout); |
bc1e6c81 | 4918 | target_mourn_inferior (inferior_ptid); |
488f131b | 4919 | stop_print_frame = 0; |
22bcd14b | 4920 | stop_waiting (ecs); |
488f131b | 4921 | return; |
c5aa993b | 4922 | |
488f131b | 4923 | /* The following are the only cases in which we keep going; |
1777feb0 | 4924 | the above cases end in a continue or goto. */ |
488f131b | 4925 | case TARGET_WAITKIND_FORKED: |
deb3b17b | 4926 | case TARGET_WAITKIND_VFORKED: |
527159b7 | 4927 | if (debug_infrun) |
fed708ed PA |
4928 | { |
4929 | if (ecs->ws.kind == TARGET_WAITKIND_FORKED) | |
4930 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_FORKED\n"); | |
4931 | else | |
4932 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_VFORKED\n"); | |
4933 | } | |
c906108c | 4934 | |
e2d96639 YQ |
4935 | /* Check whether the inferior is displaced stepping. */ |
4936 | { | |
00431a78 | 4937 | struct regcache *regcache = get_thread_regcache (ecs->event_thread); |
ac7936df | 4938 | struct gdbarch *gdbarch = regcache->arch (); |
e2d96639 YQ |
4939 | |
4940 | /* If checking displaced stepping is supported, and thread | |
4941 | ecs->ptid is displaced stepping. */ | |
00431a78 | 4942 | if (displaced_step_in_progress_thread (ecs->event_thread)) |
e2d96639 YQ |
4943 | { |
4944 | struct inferior *parent_inf | |
c9657e70 | 4945 | = find_inferior_ptid (ecs->ptid); |
e2d96639 YQ |
4946 | struct regcache *child_regcache; |
4947 | CORE_ADDR parent_pc; | |
4948 | ||
4949 | /* GDB has got TARGET_WAITKIND_FORKED or TARGET_WAITKIND_VFORKED, | |
4950 | indicating that the displaced stepping of syscall instruction | |
4951 | has been done. Perform cleanup for parent process here. Note | |
4952 | that this operation also cleans up the child process for vfork, | |
4953 | because their pages are shared. */ | |
00431a78 | 4954 | displaced_step_fixup (ecs->event_thread, GDB_SIGNAL_TRAP); |
c2829269 PA |
4955 | /* Start a new step-over in another thread if there's one |
4956 | that needs it. */ | |
4957 | start_step_over (); | |
e2d96639 YQ |
4958 | |
4959 | if (ecs->ws.kind == TARGET_WAITKIND_FORKED) | |
4960 | { | |
c0987663 | 4961 | struct displaced_step_inferior_state *displaced |
00431a78 | 4962 | = get_displaced_stepping_state (parent_inf); |
c0987663 | 4963 | |
e2d96639 YQ |
4964 | /* Restore scratch pad for child process. */ |
4965 | displaced_step_restore (displaced, ecs->ws.value.related_pid); | |
4966 | } | |
4967 | ||
4968 | /* Since the vfork/fork syscall instruction was executed in the scratchpad, | |
4969 | the child's PC is also within the scratchpad. Set the child's PC | |
4970 | to the parent's PC value, which has already been fixed up. | |
4971 | FIXME: we use the parent's aspace here, although we're touching | |
4972 | the child, because the child hasn't been added to the inferior | |
4973 | list yet at this point. */ | |
4974 | ||
4975 | child_regcache | |
4976 | = get_thread_arch_aspace_regcache (ecs->ws.value.related_pid, | |
4977 | gdbarch, | |
4978 | parent_inf->aspace); | |
4979 | /* Read PC value of parent process. */ | |
4980 | parent_pc = regcache_read_pc (regcache); | |
4981 | ||
4982 | if (debug_displaced) | |
4983 | fprintf_unfiltered (gdb_stdlog, | |
4984 | "displaced: write child pc from %s to %s\n", | |
4985 | paddress (gdbarch, | |
4986 | regcache_read_pc (child_regcache)), | |
4987 | paddress (gdbarch, parent_pc)); | |
4988 | ||
4989 | regcache_write_pc (child_regcache, parent_pc); | |
4990 | } | |
4991 | } | |
4992 | ||
00431a78 | 4993 | context_switch (ecs); |
5a2901d9 | 4994 | |
b242c3c2 PA |
4995 | /* Immediately detach breakpoints from the child before there's |
4996 | any chance of letting the user delete breakpoints from the | |
4997 | breakpoint lists. If we don't do this early, it's easy to | |
4998 | leave left over traps in the child, vis: "break foo; catch | |
4999 | fork; c; <fork>; del; c; <child calls foo>". We only follow | |
5000 | the fork on the last `continue', and by that time the | |
5001 | breakpoint at "foo" is long gone from the breakpoint table. | |
5002 | If we vforked, then we don't need to unpatch here, since both | |
5003 | parent and child are sharing the same memory pages; we'll | |
5004 | need to unpatch at follow/detach time instead to be certain | |
5005 | that new breakpoints added between catchpoint hit time and | |
5006 | vfork follow are detached. */ | |
5007 | if (ecs->ws.kind != TARGET_WAITKIND_VFORKED) | |
5008 | { | |
b242c3c2 PA |
5009 | /* This won't actually modify the breakpoint list, but will |
5010 | physically remove the breakpoints from the child. */ | |
d80ee84f | 5011 | detach_breakpoints (ecs->ws.value.related_pid); |
b242c3c2 PA |
5012 | } |
5013 | ||
34b7e8a6 | 5014 | delete_just_stopped_threads_single_step_breakpoints (); |
d03285ec | 5015 | |
e58b0e63 PA |
5016 | /* In case the event is caught by a catchpoint, remember that |
5017 | the event is to be followed at the next resume of the thread, | |
5018 | and not immediately. */ | |
5019 | ecs->event_thread->pending_follow = ecs->ws; | |
5020 | ||
f2ffa92b PA |
5021 | ecs->event_thread->suspend.stop_pc |
5022 | = regcache_read_pc (get_thread_regcache (ecs->event_thread)); | |
675bf4cb | 5023 | |
16c381f0 | 5024 | ecs->event_thread->control.stop_bpstat |
a01bda52 | 5025 | = bpstat_stop_status (get_current_regcache ()->aspace (), |
f2ffa92b PA |
5026 | ecs->event_thread->suspend.stop_pc, |
5027 | ecs->event_thread, &ecs->ws); | |
675bf4cb | 5028 | |
c65d6b55 PA |
5029 | if (handle_stop_requested (ecs)) |
5030 | return; | |
5031 | ||
ce12b012 PA |
5032 | /* If no catchpoint triggered for this, then keep going. Note |
5033 | that we're interested in knowing the bpstat actually causes a | |
5034 | stop, not just if it may explain the signal. Software | |
5035 | watchpoints, for example, always appear in the bpstat. */ | |
5036 | if (!bpstat_causes_stop (ecs->event_thread->control.stop_bpstat)) | |
04e68871 | 5037 | { |
e58b0e63 | 5038 | int should_resume; |
3e43a32a MS |
5039 | int follow_child |
5040 | = (follow_fork_mode_string == follow_fork_mode_child); | |
e58b0e63 | 5041 | |
a493e3e2 | 5042 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; |
e58b0e63 PA |
5043 | |
5044 | should_resume = follow_fork (); | |
5045 | ||
00431a78 PA |
5046 | thread_info *parent = ecs->event_thread; |
5047 | thread_info *child = find_thread_ptid (ecs->ws.value.related_pid); | |
6c95b8df | 5048 | |
a2077e25 PA |
5049 | /* At this point, the parent is marked running, and the |
5050 | child is marked stopped. */ | |
5051 | ||
5052 | /* If not resuming the parent, mark it stopped. */ | |
5053 | if (follow_child && !detach_fork && !non_stop && !sched_multi) | |
00431a78 | 5054 | parent->set_running (false); |
a2077e25 PA |
5055 | |
5056 | /* If resuming the child, mark it running. */ | |
5057 | if (follow_child || (!detach_fork && (non_stop || sched_multi))) | |
00431a78 | 5058 | child->set_running (true); |
a2077e25 | 5059 | |
6c95b8df | 5060 | /* In non-stop mode, also resume the other branch. */ |
fbea99ea PA |
5061 | if (!detach_fork && (non_stop |
5062 | || (sched_multi && target_is_non_stop_p ()))) | |
6c95b8df PA |
5063 | { |
5064 | if (follow_child) | |
5065 | switch_to_thread (parent); | |
5066 | else | |
5067 | switch_to_thread (child); | |
5068 | ||
5069 | ecs->event_thread = inferior_thread (); | |
5070 | ecs->ptid = inferior_ptid; | |
5071 | keep_going (ecs); | |
5072 | } | |
5073 | ||
5074 | if (follow_child) | |
5075 | switch_to_thread (child); | |
5076 | else | |
5077 | switch_to_thread (parent); | |
5078 | ||
e58b0e63 PA |
5079 | ecs->event_thread = inferior_thread (); |
5080 | ecs->ptid = inferior_ptid; | |
5081 | ||
5082 | if (should_resume) | |
5083 | keep_going (ecs); | |
5084 | else | |
22bcd14b | 5085 | stop_waiting (ecs); |
04e68871 DJ |
5086 | return; |
5087 | } | |
94c57d6a PA |
5088 | process_event_stop_test (ecs); |
5089 | return; | |
488f131b | 5090 | |
6c95b8df PA |
5091 | case TARGET_WAITKIND_VFORK_DONE: |
5092 | /* Done with the shared memory region. Re-insert breakpoints in | |
5093 | the parent, and keep going. */ | |
5094 | ||
5095 | if (debug_infrun) | |
3e43a32a MS |
5096 | fprintf_unfiltered (gdb_stdlog, |
5097 | "infrun: TARGET_WAITKIND_VFORK_DONE\n"); | |
6c95b8df | 5098 | |
00431a78 | 5099 | context_switch (ecs); |
6c95b8df PA |
5100 | |
5101 | current_inferior ()->waiting_for_vfork_done = 0; | |
56710373 | 5102 | current_inferior ()->pspace->breakpoints_not_allowed = 0; |
c65d6b55 PA |
5103 | |
5104 | if (handle_stop_requested (ecs)) | |
5105 | return; | |
5106 | ||
6c95b8df PA |
5107 | /* This also takes care of reinserting breakpoints in the |
5108 | previously locked inferior. */ | |
5109 | keep_going (ecs); | |
5110 | return; | |
5111 | ||
488f131b | 5112 | case TARGET_WAITKIND_EXECD: |
527159b7 | 5113 | if (debug_infrun) |
fc5261f2 | 5114 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_EXECD\n"); |
488f131b | 5115 | |
cbd2b4e3 PA |
5116 | /* Note we can't read registers yet (the stop_pc), because we |
5117 | don't yet know the inferior's post-exec architecture. | |
5118 | 'stop_pc' is explicitly read below instead. */ | |
00431a78 | 5119 | switch_to_thread_no_regs (ecs->event_thread); |
5a2901d9 | 5120 | |
6c95b8df PA |
5121 | /* Do whatever is necessary to the parent branch of the vfork. */ |
5122 | handle_vfork_child_exec_or_exit (1); | |
5123 | ||
795e548f PA |
5124 | /* This causes the eventpoints and symbol table to be reset. |
5125 | Must do this now, before trying to determine whether to | |
5126 | stop. */ | |
71b43ef8 | 5127 | follow_exec (inferior_ptid, ecs->ws.value.execd_pathname); |
795e548f | 5128 | |
17d8546e DB |
5129 | /* In follow_exec we may have deleted the original thread and |
5130 | created a new one. Make sure that the event thread is the | |
5131 | execd thread for that case (this is a nop otherwise). */ | |
5132 | ecs->event_thread = inferior_thread (); | |
5133 | ||
f2ffa92b PA |
5134 | ecs->event_thread->suspend.stop_pc |
5135 | = regcache_read_pc (get_thread_regcache (ecs->event_thread)); | |
ecdc3a72 | 5136 | |
16c381f0 | 5137 | ecs->event_thread->control.stop_bpstat |
a01bda52 | 5138 | = bpstat_stop_status (get_current_regcache ()->aspace (), |
f2ffa92b PA |
5139 | ecs->event_thread->suspend.stop_pc, |
5140 | ecs->event_thread, &ecs->ws); | |
795e548f | 5141 | |
71b43ef8 PA |
5142 | /* Note that this may be referenced from inside |
5143 | bpstat_stop_status above, through inferior_has_execd. */ | |
5144 | xfree (ecs->ws.value.execd_pathname); | |
5145 | ecs->ws.value.execd_pathname = NULL; | |
5146 | ||
c65d6b55 PA |
5147 | if (handle_stop_requested (ecs)) |
5148 | return; | |
5149 | ||
04e68871 | 5150 | /* If no catchpoint triggered for this, then keep going. */ |
ce12b012 | 5151 | if (!bpstat_causes_stop (ecs->event_thread->control.stop_bpstat)) |
04e68871 | 5152 | { |
a493e3e2 | 5153 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; |
04e68871 DJ |
5154 | keep_going (ecs); |
5155 | return; | |
5156 | } | |
94c57d6a PA |
5157 | process_event_stop_test (ecs); |
5158 | return; | |
488f131b | 5159 | |
b4dc5ffa MK |
5160 | /* Be careful not to try to gather much state about a thread |
5161 | that's in a syscall. It's frequently a losing proposition. */ | |
488f131b | 5162 | case TARGET_WAITKIND_SYSCALL_ENTRY: |
527159b7 | 5163 | if (debug_infrun) |
3e43a32a MS |
5164 | fprintf_unfiltered (gdb_stdlog, |
5165 | "infrun: TARGET_WAITKIND_SYSCALL_ENTRY\n"); | |
1777feb0 | 5166 | /* Getting the current syscall number. */ |
94c57d6a PA |
5167 | if (handle_syscall_event (ecs) == 0) |
5168 | process_event_stop_test (ecs); | |
5169 | return; | |
c906108c | 5170 | |
488f131b JB |
5171 | /* Before examining the threads further, step this thread to |
5172 | get it entirely out of the syscall. (We get notice of the | |
5173 | event when the thread is just on the verge of exiting a | |
5174 | syscall. Stepping one instruction seems to get it back | |
b4dc5ffa | 5175 | into user code.) */ |
488f131b | 5176 | case TARGET_WAITKIND_SYSCALL_RETURN: |
527159b7 | 5177 | if (debug_infrun) |
3e43a32a MS |
5178 | fprintf_unfiltered (gdb_stdlog, |
5179 | "infrun: TARGET_WAITKIND_SYSCALL_RETURN\n"); | |
94c57d6a PA |
5180 | if (handle_syscall_event (ecs) == 0) |
5181 | process_event_stop_test (ecs); | |
5182 | return; | |
c906108c | 5183 | |
488f131b | 5184 | case TARGET_WAITKIND_STOPPED: |
527159b7 | 5185 | if (debug_infrun) |
8a9de0e4 | 5186 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_STOPPED\n"); |
4f5d7f63 PA |
5187 | handle_signal_stop (ecs); |
5188 | return; | |
c906108c | 5189 | |
b2175913 | 5190 | case TARGET_WAITKIND_NO_HISTORY: |
4b4e080e PA |
5191 | if (debug_infrun) |
5192 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_NO_HISTORY\n"); | |
b2175913 | 5193 | /* Reverse execution: target ran out of history info. */ |
eab402df | 5194 | |
d1988021 | 5195 | /* Switch to the stopped thread. */ |
00431a78 | 5196 | context_switch (ecs); |
d1988021 MM |
5197 | if (debug_infrun) |
5198 | fprintf_unfiltered (gdb_stdlog, "infrun: stopped\n"); | |
5199 | ||
34b7e8a6 | 5200 | delete_just_stopped_threads_single_step_breakpoints (); |
f2ffa92b PA |
5201 | ecs->event_thread->suspend.stop_pc |
5202 | = regcache_read_pc (get_thread_regcache (inferior_thread ())); | |
c65d6b55 PA |
5203 | |
5204 | if (handle_stop_requested (ecs)) | |
5205 | return; | |
5206 | ||
76727919 | 5207 | gdb::observers::no_history.notify (); |
22bcd14b | 5208 | stop_waiting (ecs); |
b2175913 | 5209 | return; |
488f131b | 5210 | } |
4f5d7f63 PA |
5211 | } |
5212 | ||
0b6e5e10 JB |
5213 | /* A wrapper around handle_inferior_event_1, which also makes sure |
5214 | that all temporary struct value objects that were created during | |
5215 | the handling of the event get deleted at the end. */ | |
5216 | ||
5217 | static void | |
5218 | handle_inferior_event (struct execution_control_state *ecs) | |
5219 | { | |
5220 | struct value *mark = value_mark (); | |
5221 | ||
5222 | handle_inferior_event_1 (ecs); | |
5223 | /* Purge all temporary values created during the event handling, | |
5224 | as it could be a long time before we return to the command level | |
5225 | where such values would otherwise be purged. */ | |
5226 | value_free_to_mark (mark); | |
5227 | } | |
5228 | ||
372316f1 PA |
5229 | /* Restart threads back to what they were trying to do back when we |
5230 | paused them for an in-line step-over. The EVENT_THREAD thread is | |
5231 | ignored. */ | |
4d9d9d04 PA |
5232 | |
5233 | static void | |
372316f1 PA |
5234 | restart_threads (struct thread_info *event_thread) |
5235 | { | |
372316f1 PA |
5236 | /* In case the instruction just stepped spawned a new thread. */ |
5237 | update_thread_list (); | |
5238 | ||
08036331 | 5239 | for (thread_info *tp : all_non_exited_threads ()) |
372316f1 PA |
5240 | { |
5241 | if (tp == event_thread) | |
5242 | { | |
5243 | if (debug_infrun) | |
5244 | fprintf_unfiltered (gdb_stdlog, | |
5245 | "infrun: restart threads: " | |
5246 | "[%s] is event thread\n", | |
5247 | target_pid_to_str (tp->ptid)); | |
5248 | continue; | |
5249 | } | |
5250 | ||
5251 | if (!(tp->state == THREAD_RUNNING || tp->control.in_infcall)) | |
5252 | { | |
5253 | if (debug_infrun) | |
5254 | fprintf_unfiltered (gdb_stdlog, | |
5255 | "infrun: restart threads: " | |
5256 | "[%s] not meant to be running\n", | |
5257 | target_pid_to_str (tp->ptid)); | |
5258 | continue; | |
5259 | } | |
5260 | ||
5261 | if (tp->resumed) | |
5262 | { | |
5263 | if (debug_infrun) | |
5264 | fprintf_unfiltered (gdb_stdlog, | |
5265 | "infrun: restart threads: [%s] resumed\n", | |
5266 | target_pid_to_str (tp->ptid)); | |
5267 | gdb_assert (tp->executing || tp->suspend.waitstatus_pending_p); | |
5268 | continue; | |
5269 | } | |
5270 | ||
5271 | if (thread_is_in_step_over_chain (tp)) | |
5272 | { | |
5273 | if (debug_infrun) | |
5274 | fprintf_unfiltered (gdb_stdlog, | |
5275 | "infrun: restart threads: " | |
5276 | "[%s] needs step-over\n", | |
5277 | target_pid_to_str (tp->ptid)); | |
5278 | gdb_assert (!tp->resumed); | |
5279 | continue; | |
5280 | } | |
5281 | ||
5282 | ||
5283 | if (tp->suspend.waitstatus_pending_p) | |
5284 | { | |
5285 | if (debug_infrun) | |
5286 | fprintf_unfiltered (gdb_stdlog, | |
5287 | "infrun: restart threads: " | |
5288 | "[%s] has pending status\n", | |
5289 | target_pid_to_str (tp->ptid)); | |
5290 | tp->resumed = 1; | |
5291 | continue; | |
5292 | } | |
5293 | ||
c65d6b55 PA |
5294 | gdb_assert (!tp->stop_requested); |
5295 | ||
372316f1 PA |
5296 | /* If some thread needs to start a step-over at this point, it |
5297 | should still be in the step-over queue, and thus skipped | |
5298 | above. */ | |
5299 | if (thread_still_needs_step_over (tp)) | |
5300 | { | |
5301 | internal_error (__FILE__, __LINE__, | |
5302 | "thread [%s] needs a step-over, but not in " | |
5303 | "step-over queue\n", | |
5304 | target_pid_to_str (tp->ptid)); | |
5305 | } | |
5306 | ||
5307 | if (currently_stepping (tp)) | |
5308 | { | |
5309 | if (debug_infrun) | |
5310 | fprintf_unfiltered (gdb_stdlog, | |
5311 | "infrun: restart threads: [%s] was stepping\n", | |
5312 | target_pid_to_str (tp->ptid)); | |
5313 | keep_going_stepped_thread (tp); | |
5314 | } | |
5315 | else | |
5316 | { | |
5317 | struct execution_control_state ecss; | |
5318 | struct execution_control_state *ecs = &ecss; | |
5319 | ||
5320 | if (debug_infrun) | |
5321 | fprintf_unfiltered (gdb_stdlog, | |
5322 | "infrun: restart threads: [%s] continuing\n", | |
5323 | target_pid_to_str (tp->ptid)); | |
5324 | reset_ecs (ecs, tp); | |
00431a78 | 5325 | switch_to_thread (tp); |
372316f1 PA |
5326 | keep_going_pass_signal (ecs); |
5327 | } | |
5328 | } | |
5329 | } | |
5330 | ||
5331 | /* Callback for iterate_over_threads. Find a resumed thread that has | |
5332 | a pending waitstatus. */ | |
5333 | ||
5334 | static int | |
5335 | resumed_thread_with_pending_status (struct thread_info *tp, | |
5336 | void *arg) | |
5337 | { | |
5338 | return (tp->resumed | |
5339 | && tp->suspend.waitstatus_pending_p); | |
5340 | } | |
5341 | ||
5342 | /* Called when we get an event that may finish an in-line or | |
5343 | out-of-line (displaced stepping) step-over started previously. | |
5344 | Return true if the event is processed and we should go back to the | |
5345 | event loop; false if the caller should continue processing the | |
5346 | event. */ | |
5347 | ||
5348 | static int | |
4d9d9d04 PA |
5349 | finish_step_over (struct execution_control_state *ecs) |
5350 | { | |
372316f1 PA |
5351 | int had_step_over_info; |
5352 | ||
00431a78 | 5353 | displaced_step_fixup (ecs->event_thread, |
4d9d9d04 PA |
5354 | ecs->event_thread->suspend.stop_signal); |
5355 | ||
372316f1 PA |
5356 | had_step_over_info = step_over_info_valid_p (); |
5357 | ||
5358 | if (had_step_over_info) | |
4d9d9d04 PA |
5359 | { |
5360 | /* If we're stepping over a breakpoint with all threads locked, | |
5361 | then only the thread that was stepped should be reporting | |
5362 | back an event. */ | |
5363 | gdb_assert (ecs->event_thread->control.trap_expected); | |
5364 | ||
c65d6b55 | 5365 | clear_step_over_info (); |
4d9d9d04 PA |
5366 | } |
5367 | ||
fbea99ea | 5368 | if (!target_is_non_stop_p ()) |
372316f1 | 5369 | return 0; |
4d9d9d04 PA |
5370 | |
5371 | /* Start a new step-over in another thread if there's one that | |
5372 | needs it. */ | |
5373 | start_step_over (); | |
372316f1 PA |
5374 | |
5375 | /* If we were stepping over a breakpoint before, and haven't started | |
5376 | a new in-line step-over sequence, then restart all other threads | |
5377 | (except the event thread). We can't do this in all-stop, as then | |
5378 | e.g., we wouldn't be able to issue any other remote packet until | |
5379 | these other threads stop. */ | |
5380 | if (had_step_over_info && !step_over_info_valid_p ()) | |
5381 | { | |
5382 | struct thread_info *pending; | |
5383 | ||
5384 | /* If we only have threads with pending statuses, the restart | |
5385 | below won't restart any thread and so nothing re-inserts the | |
5386 | breakpoint we just stepped over. But we need it inserted | |
5387 | when we later process the pending events, otherwise if | |
5388 | another thread has a pending event for this breakpoint too, | |
5389 | we'd discard its event (because the breakpoint that | |
5390 | originally caused the event was no longer inserted). */ | |
00431a78 | 5391 | context_switch (ecs); |
372316f1 PA |
5392 | insert_breakpoints (); |
5393 | ||
5394 | restart_threads (ecs->event_thread); | |
5395 | ||
5396 | /* If we have events pending, go through handle_inferior_event | |
5397 | again, picking up a pending event at random. This avoids | |
5398 | thread starvation. */ | |
5399 | ||
5400 | /* But not if we just stepped over a watchpoint in order to let | |
5401 | the instruction execute so we can evaluate its expression. | |
5402 | The set of watchpoints that triggered is recorded in the | |
5403 | breakpoint objects themselves (see bp->watchpoint_triggered). | |
5404 | If we processed another event first, that other event could | |
5405 | clobber this info. */ | |
5406 | if (ecs->event_thread->stepping_over_watchpoint) | |
5407 | return 0; | |
5408 | ||
5409 | pending = iterate_over_threads (resumed_thread_with_pending_status, | |
5410 | NULL); | |
5411 | if (pending != NULL) | |
5412 | { | |
5413 | struct thread_info *tp = ecs->event_thread; | |
5414 | struct regcache *regcache; | |
5415 | ||
5416 | if (debug_infrun) | |
5417 | { | |
5418 | fprintf_unfiltered (gdb_stdlog, | |
5419 | "infrun: found resumed threads with " | |
5420 | "pending events, saving status\n"); | |
5421 | } | |
5422 | ||
5423 | gdb_assert (pending != tp); | |
5424 | ||
5425 | /* Record the event thread's event for later. */ | |
5426 | save_waitstatus (tp, &ecs->ws); | |
5427 | /* This was cleared early, by handle_inferior_event. Set it | |
5428 | so this pending event is considered by | |
5429 | do_target_wait. */ | |
5430 | tp->resumed = 1; | |
5431 | ||
5432 | gdb_assert (!tp->executing); | |
5433 | ||
00431a78 | 5434 | regcache = get_thread_regcache (tp); |
372316f1 PA |
5435 | tp->suspend.stop_pc = regcache_read_pc (regcache); |
5436 | ||
5437 | if (debug_infrun) | |
5438 | { | |
5439 | fprintf_unfiltered (gdb_stdlog, | |
5440 | "infrun: saved stop_pc=%s for %s " | |
5441 | "(currently_stepping=%d)\n", | |
5442 | paddress (target_gdbarch (), | |
5443 | tp->suspend.stop_pc), | |
5444 | target_pid_to_str (tp->ptid), | |
5445 | currently_stepping (tp)); | |
5446 | } | |
5447 | ||
5448 | /* This in-line step-over finished; clear this so we won't | |
5449 | start a new one. This is what handle_signal_stop would | |
5450 | do, if we returned false. */ | |
5451 | tp->stepping_over_breakpoint = 0; | |
5452 | ||
5453 | /* Wake up the event loop again. */ | |
5454 | mark_async_event_handler (infrun_async_inferior_event_token); | |
5455 | ||
5456 | prepare_to_wait (ecs); | |
5457 | return 1; | |
5458 | } | |
5459 | } | |
5460 | ||
5461 | return 0; | |
4d9d9d04 PA |
5462 | } |
5463 | ||
4f5d7f63 PA |
5464 | /* Come here when the program has stopped with a signal. */ |
5465 | ||
5466 | static void | |
5467 | handle_signal_stop (struct execution_control_state *ecs) | |
5468 | { | |
5469 | struct frame_info *frame; | |
5470 | struct gdbarch *gdbarch; | |
5471 | int stopped_by_watchpoint; | |
5472 | enum stop_kind stop_soon; | |
5473 | int random_signal; | |
c906108c | 5474 | |
f0407826 DE |
5475 | gdb_assert (ecs->ws.kind == TARGET_WAITKIND_STOPPED); |
5476 | ||
c65d6b55 PA |
5477 | ecs->event_thread->suspend.stop_signal = ecs->ws.value.sig; |
5478 | ||
f0407826 DE |
5479 | /* Do we need to clean up the state of a thread that has |
5480 | completed a displaced single-step? (Doing so usually affects | |
5481 | the PC, so do it here, before we set stop_pc.) */ | |
372316f1 PA |
5482 | if (finish_step_over (ecs)) |
5483 | return; | |
f0407826 DE |
5484 | |
5485 | /* If we either finished a single-step or hit a breakpoint, but | |
5486 | the user wanted this thread to be stopped, pretend we got a | |
5487 | SIG0 (generic unsignaled stop). */ | |
5488 | if (ecs->event_thread->stop_requested | |
5489 | && ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP) | |
5490 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; | |
237fc4c9 | 5491 | |
f2ffa92b PA |
5492 | ecs->event_thread->suspend.stop_pc |
5493 | = regcache_read_pc (get_thread_regcache (ecs->event_thread)); | |
488f131b | 5494 | |
527159b7 | 5495 | if (debug_infrun) |
237fc4c9 | 5496 | { |
00431a78 | 5497 | struct regcache *regcache = get_thread_regcache (ecs->event_thread); |
b926417a | 5498 | struct gdbarch *reg_gdbarch = regcache->arch (); |
2989a365 | 5499 | scoped_restore save_inferior_ptid = make_scoped_restore (&inferior_ptid); |
7f82dfc7 JK |
5500 | |
5501 | inferior_ptid = ecs->ptid; | |
5af949e3 UW |
5502 | |
5503 | fprintf_unfiltered (gdb_stdlog, "infrun: stop_pc = %s\n", | |
b926417a | 5504 | paddress (reg_gdbarch, |
f2ffa92b | 5505 | ecs->event_thread->suspend.stop_pc)); |
d92524f1 | 5506 | if (target_stopped_by_watchpoint ()) |
237fc4c9 PA |
5507 | { |
5508 | CORE_ADDR addr; | |
abbb1732 | 5509 | |
237fc4c9 PA |
5510 | fprintf_unfiltered (gdb_stdlog, "infrun: stopped by watchpoint\n"); |
5511 | ||
8b88a78e | 5512 | if (target_stopped_data_address (current_top_target (), &addr)) |
237fc4c9 | 5513 | fprintf_unfiltered (gdb_stdlog, |
5af949e3 | 5514 | "infrun: stopped data address = %s\n", |
b926417a | 5515 | paddress (reg_gdbarch, addr)); |
237fc4c9 PA |
5516 | else |
5517 | fprintf_unfiltered (gdb_stdlog, | |
5518 | "infrun: (no data address available)\n"); | |
5519 | } | |
5520 | } | |
527159b7 | 5521 | |
36fa8042 PA |
5522 | /* This is originated from start_remote(), start_inferior() and |
5523 | shared libraries hook functions. */ | |
00431a78 | 5524 | stop_soon = get_inferior_stop_soon (ecs); |
36fa8042 PA |
5525 | if (stop_soon == STOP_QUIETLY || stop_soon == STOP_QUIETLY_REMOTE) |
5526 | { | |
00431a78 | 5527 | context_switch (ecs); |
36fa8042 PA |
5528 | if (debug_infrun) |
5529 | fprintf_unfiltered (gdb_stdlog, "infrun: quietly stopped\n"); | |
5530 | stop_print_frame = 1; | |
22bcd14b | 5531 | stop_waiting (ecs); |
36fa8042 PA |
5532 | return; |
5533 | } | |
5534 | ||
36fa8042 PA |
5535 | /* This originates from attach_command(). We need to overwrite |
5536 | the stop_signal here, because some kernels don't ignore a | |
5537 | SIGSTOP in a subsequent ptrace(PTRACE_CONT,SIGSTOP) call. | |
5538 | See more comments in inferior.h. On the other hand, if we | |
5539 | get a non-SIGSTOP, report it to the user - assume the backend | |
5540 | will handle the SIGSTOP if it should show up later. | |
5541 | ||
5542 | Also consider that the attach is complete when we see a | |
5543 | SIGTRAP. Some systems (e.g. Windows), and stubs supporting | |
5544 | target extended-remote report it instead of a SIGSTOP | |
5545 | (e.g. gdbserver). We already rely on SIGTRAP being our | |
5546 | signal, so this is no exception. | |
5547 | ||
5548 | Also consider that the attach is complete when we see a | |
5549 | GDB_SIGNAL_0. In non-stop mode, GDB will explicitly tell | |
5550 | the target to stop all threads of the inferior, in case the | |
5551 | low level attach operation doesn't stop them implicitly. If | |
5552 | they weren't stopped implicitly, then the stub will report a | |
5553 | GDB_SIGNAL_0, meaning: stopped for no particular reason | |
5554 | other than GDB's request. */ | |
5555 | if (stop_soon == STOP_QUIETLY_NO_SIGSTOP | |
5556 | && (ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_STOP | |
5557 | || ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP | |
5558 | || ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_0)) | |
5559 | { | |
5560 | stop_print_frame = 1; | |
22bcd14b | 5561 | stop_waiting (ecs); |
36fa8042 PA |
5562 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; |
5563 | return; | |
5564 | } | |
5565 | ||
488f131b | 5566 | /* See if something interesting happened to the non-current thread. If |
b40c7d58 | 5567 | so, then switch to that thread. */ |
d7e15655 | 5568 | if (ecs->ptid != inferior_ptid) |
488f131b | 5569 | { |
527159b7 | 5570 | if (debug_infrun) |
8a9de0e4 | 5571 | fprintf_unfiltered (gdb_stdlog, "infrun: context switch\n"); |
527159b7 | 5572 | |
00431a78 | 5573 | context_switch (ecs); |
c5aa993b | 5574 | |
9a4105ab | 5575 | if (deprecated_context_hook) |
00431a78 | 5576 | deprecated_context_hook (ecs->event_thread->global_num); |
488f131b | 5577 | } |
c906108c | 5578 | |
568d6575 UW |
5579 | /* At this point, get hold of the now-current thread's frame. */ |
5580 | frame = get_current_frame (); | |
5581 | gdbarch = get_frame_arch (frame); | |
5582 | ||
2adfaa28 | 5583 | /* Pull the single step breakpoints out of the target. */ |
af48d08f | 5584 | if (ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP) |
488f131b | 5585 | { |
af48d08f | 5586 | struct regcache *regcache; |
af48d08f | 5587 | CORE_ADDR pc; |
2adfaa28 | 5588 | |
00431a78 | 5589 | regcache = get_thread_regcache (ecs->event_thread); |
8b86c959 YQ |
5590 | const address_space *aspace = regcache->aspace (); |
5591 | ||
af48d08f | 5592 | pc = regcache_read_pc (regcache); |
34b7e8a6 | 5593 | |
af48d08f PA |
5594 | /* However, before doing so, if this single-step breakpoint was |
5595 | actually for another thread, set this thread up for moving | |
5596 | past it. */ | |
5597 | if (!thread_has_single_step_breakpoint_here (ecs->event_thread, | |
5598 | aspace, pc)) | |
5599 | { | |
5600 | if (single_step_breakpoint_inserted_here_p (aspace, pc)) | |
2adfaa28 PA |
5601 | { |
5602 | if (debug_infrun) | |
5603 | { | |
5604 | fprintf_unfiltered (gdb_stdlog, | |
af48d08f | 5605 | "infrun: [%s] hit another thread's " |
34b7e8a6 PA |
5606 | "single-step breakpoint\n", |
5607 | target_pid_to_str (ecs->ptid)); | |
2adfaa28 | 5608 | } |
af48d08f PA |
5609 | ecs->hit_singlestep_breakpoint = 1; |
5610 | } | |
5611 | } | |
5612 | else | |
5613 | { | |
5614 | if (debug_infrun) | |
5615 | { | |
5616 | fprintf_unfiltered (gdb_stdlog, | |
5617 | "infrun: [%s] hit its " | |
5618 | "single-step breakpoint\n", | |
5619 | target_pid_to_str (ecs->ptid)); | |
2adfaa28 PA |
5620 | } |
5621 | } | |
488f131b | 5622 | } |
af48d08f | 5623 | delete_just_stopped_threads_single_step_breakpoints (); |
c906108c | 5624 | |
963f9c80 PA |
5625 | if (ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP |
5626 | && ecs->event_thread->control.trap_expected | |
5627 | && ecs->event_thread->stepping_over_watchpoint) | |
d983da9c DJ |
5628 | stopped_by_watchpoint = 0; |
5629 | else | |
5630 | stopped_by_watchpoint = watchpoints_triggered (&ecs->ws); | |
5631 | ||
5632 | /* If necessary, step over this watchpoint. We'll be back to display | |
5633 | it in a moment. */ | |
5634 | if (stopped_by_watchpoint | |
d92524f1 | 5635 | && (target_have_steppable_watchpoint |
568d6575 | 5636 | || gdbarch_have_nonsteppable_watchpoint (gdbarch))) |
488f131b | 5637 | { |
488f131b JB |
5638 | /* At this point, we are stopped at an instruction which has |
5639 | attempted to write to a piece of memory under control of | |
5640 | a watchpoint. The instruction hasn't actually executed | |
5641 | yet. If we were to evaluate the watchpoint expression | |
5642 | now, we would get the old value, and therefore no change | |
5643 | would seem to have occurred. | |
5644 | ||
5645 | In order to make watchpoints work `right', we really need | |
5646 | to complete the memory write, and then evaluate the | |
d983da9c DJ |
5647 | watchpoint expression. We do this by single-stepping the |
5648 | target. | |
5649 | ||
7f89fd65 | 5650 | It may not be necessary to disable the watchpoint to step over |
d983da9c DJ |
5651 | it. For example, the PA can (with some kernel cooperation) |
5652 | single step over a watchpoint without disabling the watchpoint. | |
5653 | ||
5654 | It is far more common to need to disable a watchpoint to step | |
5655 | the inferior over it. If we have non-steppable watchpoints, | |
5656 | we must disable the current watchpoint; it's simplest to | |
963f9c80 PA |
5657 | disable all watchpoints. |
5658 | ||
5659 | Any breakpoint at PC must also be stepped over -- if there's | |
5660 | one, it will have already triggered before the watchpoint | |
5661 | triggered, and we either already reported it to the user, or | |
5662 | it didn't cause a stop and we called keep_going. In either | |
5663 | case, if there was a breakpoint at PC, we must be trying to | |
5664 | step past it. */ | |
5665 | ecs->event_thread->stepping_over_watchpoint = 1; | |
5666 | keep_going (ecs); | |
488f131b JB |
5667 | return; |
5668 | } | |
5669 | ||
4e1c45ea | 5670 | ecs->event_thread->stepping_over_breakpoint = 0; |
963f9c80 | 5671 | ecs->event_thread->stepping_over_watchpoint = 0; |
16c381f0 JK |
5672 | bpstat_clear (&ecs->event_thread->control.stop_bpstat); |
5673 | ecs->event_thread->control.stop_step = 0; | |
488f131b | 5674 | stop_print_frame = 1; |
488f131b | 5675 | stopped_by_random_signal = 0; |
ddfe970e | 5676 | bpstat stop_chain = NULL; |
488f131b | 5677 | |
edb3359d DJ |
5678 | /* Hide inlined functions starting here, unless we just performed stepi or |
5679 | nexti. After stepi and nexti, always show the innermost frame (not any | |
5680 | inline function call sites). */ | |
16c381f0 | 5681 | if (ecs->event_thread->control.step_range_end != 1) |
0574c78f | 5682 | { |
00431a78 PA |
5683 | const address_space *aspace |
5684 | = get_thread_regcache (ecs->event_thread)->aspace (); | |
0574c78f GB |
5685 | |
5686 | /* skip_inline_frames is expensive, so we avoid it if we can | |
5687 | determine that the address is one where functions cannot have | |
5688 | been inlined. This improves performance with inferiors that | |
5689 | load a lot of shared libraries, because the solib event | |
5690 | breakpoint is defined as the address of a function (i.e. not | |
5691 | inline). Note that we have to check the previous PC as well | |
5692 | as the current one to catch cases when we have just | |
5693 | single-stepped off a breakpoint prior to reinstating it. | |
5694 | Note that we're assuming that the code we single-step to is | |
5695 | not inline, but that's not definitive: there's nothing | |
5696 | preventing the event breakpoint function from containing | |
5697 | inlined code, and the single-step ending up there. If the | |
5698 | user had set a breakpoint on that inlined code, the missing | |
5699 | skip_inline_frames call would break things. Fortunately | |
5700 | that's an extremely unlikely scenario. */ | |
f2ffa92b PA |
5701 | if (!pc_at_non_inline_function (aspace, |
5702 | ecs->event_thread->suspend.stop_pc, | |
5703 | &ecs->ws) | |
a210c238 MR |
5704 | && !(ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP |
5705 | && ecs->event_thread->control.trap_expected | |
5706 | && pc_at_non_inline_function (aspace, | |
5707 | ecs->event_thread->prev_pc, | |
09ac7c10 | 5708 | &ecs->ws))) |
1c5a993e | 5709 | { |
f2ffa92b PA |
5710 | stop_chain = build_bpstat_chain (aspace, |
5711 | ecs->event_thread->suspend.stop_pc, | |
5712 | &ecs->ws); | |
00431a78 | 5713 | skip_inline_frames (ecs->event_thread, stop_chain); |
1c5a993e MR |
5714 | |
5715 | /* Re-fetch current thread's frame in case that invalidated | |
5716 | the frame cache. */ | |
5717 | frame = get_current_frame (); | |
5718 | gdbarch = get_frame_arch (frame); | |
5719 | } | |
0574c78f | 5720 | } |
edb3359d | 5721 | |
a493e3e2 | 5722 | if (ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP |
16c381f0 | 5723 | && ecs->event_thread->control.trap_expected |
568d6575 | 5724 | && gdbarch_single_step_through_delay_p (gdbarch) |
4e1c45ea | 5725 | && currently_stepping (ecs->event_thread)) |
3352ef37 | 5726 | { |
b50d7442 | 5727 | /* We're trying to step off a breakpoint. Turns out that we're |
3352ef37 | 5728 | also on an instruction that needs to be stepped multiple |
1777feb0 | 5729 | times before it's been fully executing. E.g., architectures |
3352ef37 AC |
5730 | with a delay slot. It needs to be stepped twice, once for |
5731 | the instruction and once for the delay slot. */ | |
5732 | int step_through_delay | |
568d6575 | 5733 | = gdbarch_single_step_through_delay (gdbarch, frame); |
abbb1732 | 5734 | |
527159b7 | 5735 | if (debug_infrun && step_through_delay) |
8a9de0e4 | 5736 | fprintf_unfiltered (gdb_stdlog, "infrun: step through delay\n"); |
16c381f0 JK |
5737 | if (ecs->event_thread->control.step_range_end == 0 |
5738 | && step_through_delay) | |
3352ef37 AC |
5739 | { |
5740 | /* The user issued a continue when stopped at a breakpoint. | |
5741 | Set up for another trap and get out of here. */ | |
4e1c45ea | 5742 | ecs->event_thread->stepping_over_breakpoint = 1; |
3352ef37 AC |
5743 | keep_going (ecs); |
5744 | return; | |
5745 | } | |
5746 | else if (step_through_delay) | |
5747 | { | |
5748 | /* The user issued a step when stopped at a breakpoint. | |
5749 | Maybe we should stop, maybe we should not - the delay | |
5750 | slot *might* correspond to a line of source. In any | |
ca67fcb8 VP |
5751 | case, don't decide that here, just set |
5752 | ecs->stepping_over_breakpoint, making sure we | |
5753 | single-step again before breakpoints are re-inserted. */ | |
4e1c45ea | 5754 | ecs->event_thread->stepping_over_breakpoint = 1; |
3352ef37 AC |
5755 | } |
5756 | } | |
5757 | ||
ab04a2af TT |
5758 | /* See if there is a breakpoint/watchpoint/catchpoint/etc. that |
5759 | handles this event. */ | |
5760 | ecs->event_thread->control.stop_bpstat | |
a01bda52 | 5761 | = bpstat_stop_status (get_current_regcache ()->aspace (), |
f2ffa92b PA |
5762 | ecs->event_thread->suspend.stop_pc, |
5763 | ecs->event_thread, &ecs->ws, stop_chain); | |
db82e815 | 5764 | |
ab04a2af TT |
5765 | /* Following in case break condition called a |
5766 | function. */ | |
5767 | stop_print_frame = 1; | |
73dd234f | 5768 | |
ab04a2af TT |
5769 | /* This is where we handle "moribund" watchpoints. Unlike |
5770 | software breakpoints traps, hardware watchpoint traps are | |
5771 | always distinguishable from random traps. If no high-level | |
5772 | watchpoint is associated with the reported stop data address | |
5773 | anymore, then the bpstat does not explain the signal --- | |
5774 | simply make sure to ignore it if `stopped_by_watchpoint' is | |
5775 | set. */ | |
5776 | ||
5777 | if (debug_infrun | |
5778 | && ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP | |
47591c29 | 5779 | && !bpstat_explains_signal (ecs->event_thread->control.stop_bpstat, |
427cd150 | 5780 | GDB_SIGNAL_TRAP) |
ab04a2af TT |
5781 | && stopped_by_watchpoint) |
5782 | fprintf_unfiltered (gdb_stdlog, | |
5783 | "infrun: no user watchpoint explains " | |
5784 | "watchpoint SIGTRAP, ignoring\n"); | |
73dd234f | 5785 | |
bac7d97b | 5786 | /* NOTE: cagney/2003-03-29: These checks for a random signal |
ab04a2af TT |
5787 | at one stage in the past included checks for an inferior |
5788 | function call's call dummy's return breakpoint. The original | |
5789 | comment, that went with the test, read: | |
03cebad2 | 5790 | |
ab04a2af TT |
5791 | ``End of a stack dummy. Some systems (e.g. Sony news) give |
5792 | another signal besides SIGTRAP, so check here as well as | |
5793 | above.'' | |
73dd234f | 5794 | |
ab04a2af TT |
5795 | If someone ever tries to get call dummys on a |
5796 | non-executable stack to work (where the target would stop | |
5797 | with something like a SIGSEGV), then those tests might need | |
5798 | to be re-instated. Given, however, that the tests were only | |
5799 | enabled when momentary breakpoints were not being used, I | |
5800 | suspect that it won't be the case. | |
488f131b | 5801 | |
ab04a2af TT |
5802 | NOTE: kettenis/2004-02-05: Indeed such checks don't seem to |
5803 | be necessary for call dummies on a non-executable stack on | |
5804 | SPARC. */ | |
488f131b | 5805 | |
bac7d97b | 5806 | /* See if the breakpoints module can explain the signal. */ |
47591c29 PA |
5807 | random_signal |
5808 | = !bpstat_explains_signal (ecs->event_thread->control.stop_bpstat, | |
5809 | ecs->event_thread->suspend.stop_signal); | |
bac7d97b | 5810 | |
1cf4d951 PA |
5811 | /* Maybe this was a trap for a software breakpoint that has since |
5812 | been removed. */ | |
5813 | if (random_signal && target_stopped_by_sw_breakpoint ()) | |
5814 | { | |
f2ffa92b PA |
5815 | if (program_breakpoint_here_p (gdbarch, |
5816 | ecs->event_thread->suspend.stop_pc)) | |
1cf4d951 PA |
5817 | { |
5818 | struct regcache *regcache; | |
5819 | int decr_pc; | |
5820 | ||
5821 | /* Re-adjust PC to what the program would see if GDB was not | |
5822 | debugging it. */ | |
00431a78 | 5823 | regcache = get_thread_regcache (ecs->event_thread); |
527a273a | 5824 | decr_pc = gdbarch_decr_pc_after_break (gdbarch); |
1cf4d951 PA |
5825 | if (decr_pc != 0) |
5826 | { | |
07036511 TT |
5827 | gdb::optional<scoped_restore_tmpl<int>> |
5828 | restore_operation_disable; | |
1cf4d951 PA |
5829 | |
5830 | if (record_full_is_used ()) | |
07036511 TT |
5831 | restore_operation_disable.emplace |
5832 | (record_full_gdb_operation_disable_set ()); | |
1cf4d951 | 5833 | |
f2ffa92b PA |
5834 | regcache_write_pc (regcache, |
5835 | ecs->event_thread->suspend.stop_pc + decr_pc); | |
1cf4d951 PA |
5836 | } |
5837 | } | |
5838 | else | |
5839 | { | |
5840 | /* A delayed software breakpoint event. Ignore the trap. */ | |
5841 | if (debug_infrun) | |
5842 | fprintf_unfiltered (gdb_stdlog, | |
5843 | "infrun: delayed software breakpoint " | |
5844 | "trap, ignoring\n"); | |
5845 | random_signal = 0; | |
5846 | } | |
5847 | } | |
5848 | ||
5849 | /* Maybe this was a trap for a hardware breakpoint/watchpoint that | |
5850 | has since been removed. */ | |
5851 | if (random_signal && target_stopped_by_hw_breakpoint ()) | |
5852 | { | |
5853 | /* A delayed hardware breakpoint event. Ignore the trap. */ | |
5854 | if (debug_infrun) | |
5855 | fprintf_unfiltered (gdb_stdlog, | |
5856 | "infrun: delayed hardware breakpoint/watchpoint " | |
5857 | "trap, ignoring\n"); | |
5858 | random_signal = 0; | |
5859 | } | |
5860 | ||
bac7d97b PA |
5861 | /* If not, perhaps stepping/nexting can. */ |
5862 | if (random_signal) | |
5863 | random_signal = !(ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP | |
5864 | && currently_stepping (ecs->event_thread)); | |
ab04a2af | 5865 | |
2adfaa28 PA |
5866 | /* Perhaps the thread hit a single-step breakpoint of _another_ |
5867 | thread. Single-step breakpoints are transparent to the | |
5868 | breakpoints module. */ | |
5869 | if (random_signal) | |
5870 | random_signal = !ecs->hit_singlestep_breakpoint; | |
5871 | ||
bac7d97b PA |
5872 | /* No? Perhaps we got a moribund watchpoint. */ |
5873 | if (random_signal) | |
5874 | random_signal = !stopped_by_watchpoint; | |
ab04a2af | 5875 | |
c65d6b55 PA |
5876 | /* Always stop if the user explicitly requested this thread to |
5877 | remain stopped. */ | |
5878 | if (ecs->event_thread->stop_requested) | |
5879 | { | |
5880 | random_signal = 1; | |
5881 | if (debug_infrun) | |
5882 | fprintf_unfiltered (gdb_stdlog, "infrun: user-requested stop\n"); | |
5883 | } | |
5884 | ||
488f131b JB |
5885 | /* For the program's own signals, act according to |
5886 | the signal handling tables. */ | |
5887 | ||
ce12b012 | 5888 | if (random_signal) |
488f131b JB |
5889 | { |
5890 | /* Signal not for debugging purposes. */ | |
c9657e70 | 5891 | struct inferior *inf = find_inferior_ptid (ecs->ptid); |
c9737c08 | 5892 | enum gdb_signal stop_signal = ecs->event_thread->suspend.stop_signal; |
488f131b | 5893 | |
527159b7 | 5894 | if (debug_infrun) |
c9737c08 PA |
5895 | fprintf_unfiltered (gdb_stdlog, "infrun: random signal (%s)\n", |
5896 | gdb_signal_to_symbol_string (stop_signal)); | |
527159b7 | 5897 | |
488f131b JB |
5898 | stopped_by_random_signal = 1; |
5899 | ||
252fbfc8 PA |
5900 | /* Always stop on signals if we're either just gaining control |
5901 | of the program, or the user explicitly requested this thread | |
5902 | to remain stopped. */ | |
d6b48e9c | 5903 | if (stop_soon != NO_STOP_QUIETLY |
252fbfc8 | 5904 | || ecs->event_thread->stop_requested |
24291992 | 5905 | || (!inf->detaching |
16c381f0 | 5906 | && signal_stop_state (ecs->event_thread->suspend.stop_signal))) |
488f131b | 5907 | { |
22bcd14b | 5908 | stop_waiting (ecs); |
488f131b JB |
5909 | return; |
5910 | } | |
b57bacec PA |
5911 | |
5912 | /* Notify observers the signal has "handle print" set. Note we | |
5913 | returned early above if stopping; normal_stop handles the | |
5914 | printing in that case. */ | |
5915 | if (signal_print[ecs->event_thread->suspend.stop_signal]) | |
5916 | { | |
5917 | /* The signal table tells us to print about this signal. */ | |
223ffa71 | 5918 | target_terminal::ours_for_output (); |
76727919 | 5919 | gdb::observers::signal_received.notify (ecs->event_thread->suspend.stop_signal); |
223ffa71 | 5920 | target_terminal::inferior (); |
b57bacec | 5921 | } |
488f131b JB |
5922 | |
5923 | /* Clear the signal if it should not be passed. */ | |
16c381f0 | 5924 | if (signal_program[ecs->event_thread->suspend.stop_signal] == 0) |
a493e3e2 | 5925 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; |
488f131b | 5926 | |
f2ffa92b | 5927 | if (ecs->event_thread->prev_pc == ecs->event_thread->suspend.stop_pc |
16c381f0 | 5928 | && ecs->event_thread->control.trap_expected |
8358c15c | 5929 | && ecs->event_thread->control.step_resume_breakpoint == NULL) |
68f53502 AC |
5930 | { |
5931 | /* We were just starting a new sequence, attempting to | |
5932 | single-step off of a breakpoint and expecting a SIGTRAP. | |
237fc4c9 | 5933 | Instead this signal arrives. This signal will take us out |
68f53502 AC |
5934 | of the stepping range so GDB needs to remember to, when |
5935 | the signal handler returns, resume stepping off that | |
5936 | breakpoint. */ | |
5937 | /* To simplify things, "continue" is forced to use the same | |
5938 | code paths as single-step - set a breakpoint at the | |
5939 | signal return address and then, once hit, step off that | |
5940 | breakpoint. */ | |
237fc4c9 PA |
5941 | if (debug_infrun) |
5942 | fprintf_unfiltered (gdb_stdlog, | |
5943 | "infrun: signal arrived while stepping over " | |
5944 | "breakpoint\n"); | |
d3169d93 | 5945 | |
2c03e5be | 5946 | insert_hp_step_resume_breakpoint_at_frame (frame); |
4e1c45ea | 5947 | ecs->event_thread->step_after_step_resume_breakpoint = 1; |
2455069d UW |
5948 | /* Reset trap_expected to ensure breakpoints are re-inserted. */ |
5949 | ecs->event_thread->control.trap_expected = 0; | |
d137e6dc PA |
5950 | |
5951 | /* If we were nexting/stepping some other thread, switch to | |
5952 | it, so that we don't continue it, losing control. */ | |
5953 | if (!switch_back_to_stepped_thread (ecs)) | |
5954 | keep_going (ecs); | |
9d799f85 | 5955 | return; |
68f53502 | 5956 | } |
9d799f85 | 5957 | |
e5f8a7cc | 5958 | if (ecs->event_thread->suspend.stop_signal != GDB_SIGNAL_0 |
f2ffa92b PA |
5959 | && (pc_in_thread_step_range (ecs->event_thread->suspend.stop_pc, |
5960 | ecs->event_thread) | |
e5f8a7cc | 5961 | || ecs->event_thread->control.step_range_end == 1) |
edb3359d | 5962 | && frame_id_eq (get_stack_frame_id (frame), |
16c381f0 | 5963 | ecs->event_thread->control.step_stack_frame_id) |
8358c15c | 5964 | && ecs->event_thread->control.step_resume_breakpoint == NULL) |
d303a6c7 AC |
5965 | { |
5966 | /* The inferior is about to take a signal that will take it | |
5967 | out of the single step range. Set a breakpoint at the | |
5968 | current PC (which is presumably where the signal handler | |
5969 | will eventually return) and then allow the inferior to | |
5970 | run free. | |
5971 | ||
5972 | Note that this is only needed for a signal delivered | |
5973 | while in the single-step range. Nested signals aren't a | |
5974 | problem as they eventually all return. */ | |
237fc4c9 PA |
5975 | if (debug_infrun) |
5976 | fprintf_unfiltered (gdb_stdlog, | |
5977 | "infrun: signal may take us out of " | |
5978 | "single-step range\n"); | |
5979 | ||
372316f1 | 5980 | clear_step_over_info (); |
2c03e5be | 5981 | insert_hp_step_resume_breakpoint_at_frame (frame); |
e5f8a7cc | 5982 | ecs->event_thread->step_after_step_resume_breakpoint = 1; |
2455069d UW |
5983 | /* Reset trap_expected to ensure breakpoints are re-inserted. */ |
5984 | ecs->event_thread->control.trap_expected = 0; | |
9d799f85 AC |
5985 | keep_going (ecs); |
5986 | return; | |
d303a6c7 | 5987 | } |
9d799f85 AC |
5988 | |
5989 | /* Note: step_resume_breakpoint may be non-NULL. This occures | |
5990 | when either there's a nested signal, or when there's a | |
5991 | pending signal enabled just as the signal handler returns | |
5992 | (leaving the inferior at the step-resume-breakpoint without | |
5993 | actually executing it). Either way continue until the | |
5994 | breakpoint is really hit. */ | |
c447ac0b PA |
5995 | |
5996 | if (!switch_back_to_stepped_thread (ecs)) | |
5997 | { | |
5998 | if (debug_infrun) | |
5999 | fprintf_unfiltered (gdb_stdlog, | |
6000 | "infrun: random signal, keep going\n"); | |
6001 | ||
6002 | keep_going (ecs); | |
6003 | } | |
6004 | return; | |
488f131b | 6005 | } |
94c57d6a PA |
6006 | |
6007 | process_event_stop_test (ecs); | |
6008 | } | |
6009 | ||
6010 | /* Come here when we've got some debug event / signal we can explain | |
6011 | (IOW, not a random signal), and test whether it should cause a | |
6012 | stop, or whether we should resume the inferior (transparently). | |
6013 | E.g., could be a breakpoint whose condition evaluates false; we | |
6014 | could be still stepping within the line; etc. */ | |
6015 | ||
6016 | static void | |
6017 | process_event_stop_test (struct execution_control_state *ecs) | |
6018 | { | |
6019 | struct symtab_and_line stop_pc_sal; | |
6020 | struct frame_info *frame; | |
6021 | struct gdbarch *gdbarch; | |
cdaa5b73 PA |
6022 | CORE_ADDR jmp_buf_pc; |
6023 | struct bpstat_what what; | |
94c57d6a | 6024 | |
cdaa5b73 | 6025 | /* Handle cases caused by hitting a breakpoint. */ |
611c83ae | 6026 | |
cdaa5b73 PA |
6027 | frame = get_current_frame (); |
6028 | gdbarch = get_frame_arch (frame); | |
fcf3daef | 6029 | |
cdaa5b73 | 6030 | what = bpstat_what (ecs->event_thread->control.stop_bpstat); |
611c83ae | 6031 | |
cdaa5b73 PA |
6032 | if (what.call_dummy) |
6033 | { | |
6034 | stop_stack_dummy = what.call_dummy; | |
6035 | } | |
186c406b | 6036 | |
243a9253 PA |
6037 | /* A few breakpoint types have callbacks associated (e.g., |
6038 | bp_jit_event). Run them now. */ | |
6039 | bpstat_run_callbacks (ecs->event_thread->control.stop_bpstat); | |
6040 | ||
cdaa5b73 PA |
6041 | /* If we hit an internal event that triggers symbol changes, the |
6042 | current frame will be invalidated within bpstat_what (e.g., if we | |
6043 | hit an internal solib event). Re-fetch it. */ | |
6044 | frame = get_current_frame (); | |
6045 | gdbarch = get_frame_arch (frame); | |
e2e4d78b | 6046 | |
cdaa5b73 PA |
6047 | switch (what.main_action) |
6048 | { | |
6049 | case BPSTAT_WHAT_SET_LONGJMP_RESUME: | |
6050 | /* If we hit the breakpoint at longjmp while stepping, we | |
6051 | install a momentary breakpoint at the target of the | |
6052 | jmp_buf. */ | |
186c406b | 6053 | |
cdaa5b73 PA |
6054 | if (debug_infrun) |
6055 | fprintf_unfiltered (gdb_stdlog, | |
6056 | "infrun: BPSTAT_WHAT_SET_LONGJMP_RESUME\n"); | |
186c406b | 6057 | |
cdaa5b73 | 6058 | ecs->event_thread->stepping_over_breakpoint = 1; |
611c83ae | 6059 | |
cdaa5b73 PA |
6060 | if (what.is_longjmp) |
6061 | { | |
6062 | struct value *arg_value; | |
6063 | ||
6064 | /* If we set the longjmp breakpoint via a SystemTap probe, | |
6065 | then use it to extract the arguments. The destination PC | |
6066 | is the third argument to the probe. */ | |
6067 | arg_value = probe_safe_evaluate_at_pc (frame, 2); | |
6068 | if (arg_value) | |
8fa0c4f8 AA |
6069 | { |
6070 | jmp_buf_pc = value_as_address (arg_value); | |
6071 | jmp_buf_pc = gdbarch_addr_bits_remove (gdbarch, jmp_buf_pc); | |
6072 | } | |
cdaa5b73 PA |
6073 | else if (!gdbarch_get_longjmp_target_p (gdbarch) |
6074 | || !gdbarch_get_longjmp_target (gdbarch, | |
6075 | frame, &jmp_buf_pc)) | |
e2e4d78b | 6076 | { |
cdaa5b73 PA |
6077 | if (debug_infrun) |
6078 | fprintf_unfiltered (gdb_stdlog, | |
6079 | "infrun: BPSTAT_WHAT_SET_LONGJMP_RESUME " | |
6080 | "(!gdbarch_get_longjmp_target)\n"); | |
6081 | keep_going (ecs); | |
6082 | return; | |
e2e4d78b | 6083 | } |
e2e4d78b | 6084 | |
cdaa5b73 PA |
6085 | /* Insert a breakpoint at resume address. */ |
6086 | insert_longjmp_resume_breakpoint (gdbarch, jmp_buf_pc); | |
6087 | } | |
6088 | else | |
6089 | check_exception_resume (ecs, frame); | |
6090 | keep_going (ecs); | |
6091 | return; | |
e81a37f7 | 6092 | |
cdaa5b73 PA |
6093 | case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME: |
6094 | { | |
6095 | struct frame_info *init_frame; | |
e81a37f7 | 6096 | |
cdaa5b73 | 6097 | /* There are several cases to consider. |
c906108c | 6098 | |
cdaa5b73 PA |
6099 | 1. The initiating frame no longer exists. In this case we |
6100 | must stop, because the exception or longjmp has gone too | |
6101 | far. | |
2c03e5be | 6102 | |
cdaa5b73 PA |
6103 | 2. The initiating frame exists, and is the same as the |
6104 | current frame. We stop, because the exception or longjmp | |
6105 | has been caught. | |
2c03e5be | 6106 | |
cdaa5b73 PA |
6107 | 3. The initiating frame exists and is different from the |
6108 | current frame. This means the exception or longjmp has | |
6109 | been caught beneath the initiating frame, so keep going. | |
c906108c | 6110 | |
cdaa5b73 PA |
6111 | 4. longjmp breakpoint has been placed just to protect |
6112 | against stale dummy frames and user is not interested in | |
6113 | stopping around longjmps. */ | |
c5aa993b | 6114 | |
cdaa5b73 PA |
6115 | if (debug_infrun) |
6116 | fprintf_unfiltered (gdb_stdlog, | |
6117 | "infrun: BPSTAT_WHAT_CLEAR_LONGJMP_RESUME\n"); | |
c5aa993b | 6118 | |
cdaa5b73 PA |
6119 | gdb_assert (ecs->event_thread->control.exception_resume_breakpoint |
6120 | != NULL); | |
6121 | delete_exception_resume_breakpoint (ecs->event_thread); | |
c5aa993b | 6122 | |
cdaa5b73 PA |
6123 | if (what.is_longjmp) |
6124 | { | |
b67a2c6f | 6125 | check_longjmp_breakpoint_for_call_dummy (ecs->event_thread); |
c5aa993b | 6126 | |
cdaa5b73 | 6127 | if (!frame_id_p (ecs->event_thread->initiating_frame)) |
e5ef252a | 6128 | { |
cdaa5b73 PA |
6129 | /* Case 4. */ |
6130 | keep_going (ecs); | |
6131 | return; | |
e5ef252a | 6132 | } |
cdaa5b73 | 6133 | } |
c5aa993b | 6134 | |
cdaa5b73 | 6135 | init_frame = frame_find_by_id (ecs->event_thread->initiating_frame); |
527159b7 | 6136 | |
cdaa5b73 PA |
6137 | if (init_frame) |
6138 | { | |
6139 | struct frame_id current_id | |
6140 | = get_frame_id (get_current_frame ()); | |
6141 | if (frame_id_eq (current_id, | |
6142 | ecs->event_thread->initiating_frame)) | |
6143 | { | |
6144 | /* Case 2. Fall through. */ | |
6145 | } | |
6146 | else | |
6147 | { | |
6148 | /* Case 3. */ | |
6149 | keep_going (ecs); | |
6150 | return; | |
6151 | } | |
68f53502 | 6152 | } |
488f131b | 6153 | |
cdaa5b73 PA |
6154 | /* For Cases 1 and 2, remove the step-resume breakpoint, if it |
6155 | exists. */ | |
6156 | delete_step_resume_breakpoint (ecs->event_thread); | |
e5ef252a | 6157 | |
bdc36728 | 6158 | end_stepping_range (ecs); |
cdaa5b73 PA |
6159 | } |
6160 | return; | |
e5ef252a | 6161 | |
cdaa5b73 PA |
6162 | case BPSTAT_WHAT_SINGLE: |
6163 | if (debug_infrun) | |
6164 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_SINGLE\n"); | |
6165 | ecs->event_thread->stepping_over_breakpoint = 1; | |
6166 | /* Still need to check other stuff, at least the case where we | |
6167 | are stepping and step out of the right range. */ | |
6168 | break; | |
e5ef252a | 6169 | |
cdaa5b73 PA |
6170 | case BPSTAT_WHAT_STEP_RESUME: |
6171 | if (debug_infrun) | |
6172 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_STEP_RESUME\n"); | |
e5ef252a | 6173 | |
cdaa5b73 PA |
6174 | delete_step_resume_breakpoint (ecs->event_thread); |
6175 | if (ecs->event_thread->control.proceed_to_finish | |
6176 | && execution_direction == EXEC_REVERSE) | |
6177 | { | |
6178 | struct thread_info *tp = ecs->event_thread; | |
6179 | ||
6180 | /* We are finishing a function in reverse, and just hit the | |
6181 | step-resume breakpoint at the start address of the | |
6182 | function, and we're almost there -- just need to back up | |
6183 | by one more single-step, which should take us back to the | |
6184 | function call. */ | |
6185 | tp->control.step_range_start = tp->control.step_range_end = 1; | |
6186 | keep_going (ecs); | |
e5ef252a | 6187 | return; |
cdaa5b73 PA |
6188 | } |
6189 | fill_in_stop_func (gdbarch, ecs); | |
f2ffa92b | 6190 | if (ecs->event_thread->suspend.stop_pc == ecs->stop_func_start |
cdaa5b73 PA |
6191 | && execution_direction == EXEC_REVERSE) |
6192 | { | |
6193 | /* We are stepping over a function call in reverse, and just | |
6194 | hit the step-resume breakpoint at the start address of | |
6195 | the function. Go back to single-stepping, which should | |
6196 | take us back to the function call. */ | |
6197 | ecs->event_thread->stepping_over_breakpoint = 1; | |
6198 | keep_going (ecs); | |
6199 | return; | |
6200 | } | |
6201 | break; | |
e5ef252a | 6202 | |
cdaa5b73 PA |
6203 | case BPSTAT_WHAT_STOP_NOISY: |
6204 | if (debug_infrun) | |
6205 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_STOP_NOISY\n"); | |
6206 | stop_print_frame = 1; | |
e5ef252a | 6207 | |
99619bea PA |
6208 | /* Assume the thread stopped for a breapoint. We'll still check |
6209 | whether a/the breakpoint is there when the thread is next | |
6210 | resumed. */ | |
6211 | ecs->event_thread->stepping_over_breakpoint = 1; | |
e5ef252a | 6212 | |
22bcd14b | 6213 | stop_waiting (ecs); |
cdaa5b73 | 6214 | return; |
e5ef252a | 6215 | |
cdaa5b73 PA |
6216 | case BPSTAT_WHAT_STOP_SILENT: |
6217 | if (debug_infrun) | |
6218 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_STOP_SILENT\n"); | |
6219 | stop_print_frame = 0; | |
e5ef252a | 6220 | |
99619bea PA |
6221 | /* Assume the thread stopped for a breapoint. We'll still check |
6222 | whether a/the breakpoint is there when the thread is next | |
6223 | resumed. */ | |
6224 | ecs->event_thread->stepping_over_breakpoint = 1; | |
22bcd14b | 6225 | stop_waiting (ecs); |
cdaa5b73 PA |
6226 | return; |
6227 | ||
6228 | case BPSTAT_WHAT_HP_STEP_RESUME: | |
6229 | if (debug_infrun) | |
6230 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_HP_STEP_RESUME\n"); | |
6231 | ||
6232 | delete_step_resume_breakpoint (ecs->event_thread); | |
6233 | if (ecs->event_thread->step_after_step_resume_breakpoint) | |
6234 | { | |
6235 | /* Back when the step-resume breakpoint was inserted, we | |
6236 | were trying to single-step off a breakpoint. Go back to | |
6237 | doing that. */ | |
6238 | ecs->event_thread->step_after_step_resume_breakpoint = 0; | |
6239 | ecs->event_thread->stepping_over_breakpoint = 1; | |
6240 | keep_going (ecs); | |
6241 | return; | |
e5ef252a | 6242 | } |
cdaa5b73 PA |
6243 | break; |
6244 | ||
6245 | case BPSTAT_WHAT_KEEP_CHECKING: | |
6246 | break; | |
e5ef252a | 6247 | } |
c906108c | 6248 | |
af48d08f PA |
6249 | /* If we stepped a permanent breakpoint and we had a high priority |
6250 | step-resume breakpoint for the address we stepped, but we didn't | |
6251 | hit it, then we must have stepped into the signal handler. The | |
6252 | step-resume was only necessary to catch the case of _not_ | |
6253 | stepping into the handler, so delete it, and fall through to | |
6254 | checking whether the step finished. */ | |
6255 | if (ecs->event_thread->stepped_breakpoint) | |
6256 | { | |
6257 | struct breakpoint *sr_bp | |
6258 | = ecs->event_thread->control.step_resume_breakpoint; | |
6259 | ||
8d707a12 PA |
6260 | if (sr_bp != NULL |
6261 | && sr_bp->loc->permanent | |
af48d08f PA |
6262 | && sr_bp->type == bp_hp_step_resume |
6263 | && sr_bp->loc->address == ecs->event_thread->prev_pc) | |
6264 | { | |
6265 | if (debug_infrun) | |
6266 | fprintf_unfiltered (gdb_stdlog, | |
6267 | "infrun: stepped permanent breakpoint, stopped in " | |
6268 | "handler\n"); | |
6269 | delete_step_resume_breakpoint (ecs->event_thread); | |
6270 | ecs->event_thread->step_after_step_resume_breakpoint = 0; | |
6271 | } | |
6272 | } | |
6273 | ||
cdaa5b73 PA |
6274 | /* We come here if we hit a breakpoint but should not stop for it. |
6275 | Possibly we also were stepping and should stop for that. So fall | |
6276 | through and test for stepping. But, if not stepping, do not | |
6277 | stop. */ | |
c906108c | 6278 | |
a7212384 UW |
6279 | /* In all-stop mode, if we're currently stepping but have stopped in |
6280 | some other thread, we need to switch back to the stepped thread. */ | |
c447ac0b PA |
6281 | if (switch_back_to_stepped_thread (ecs)) |
6282 | return; | |
776f04fa | 6283 | |
8358c15c | 6284 | if (ecs->event_thread->control.step_resume_breakpoint) |
488f131b | 6285 | { |
527159b7 | 6286 | if (debug_infrun) |
d3169d93 DJ |
6287 | fprintf_unfiltered (gdb_stdlog, |
6288 | "infrun: step-resume breakpoint is inserted\n"); | |
527159b7 | 6289 | |
488f131b JB |
6290 | /* Having a step-resume breakpoint overrides anything |
6291 | else having to do with stepping commands until | |
6292 | that breakpoint is reached. */ | |
488f131b JB |
6293 | keep_going (ecs); |
6294 | return; | |
6295 | } | |
c5aa993b | 6296 | |
16c381f0 | 6297 | if (ecs->event_thread->control.step_range_end == 0) |
488f131b | 6298 | { |
527159b7 | 6299 | if (debug_infrun) |
8a9de0e4 | 6300 | fprintf_unfiltered (gdb_stdlog, "infrun: no stepping, continue\n"); |
488f131b | 6301 | /* Likewise if we aren't even stepping. */ |
488f131b JB |
6302 | keep_going (ecs); |
6303 | return; | |
6304 | } | |
c5aa993b | 6305 | |
4b7703ad JB |
6306 | /* Re-fetch current thread's frame in case the code above caused |
6307 | the frame cache to be re-initialized, making our FRAME variable | |
6308 | a dangling pointer. */ | |
6309 | frame = get_current_frame (); | |
628fe4e4 | 6310 | gdbarch = get_frame_arch (frame); |
7e324e48 | 6311 | fill_in_stop_func (gdbarch, ecs); |
4b7703ad | 6312 | |
488f131b | 6313 | /* If stepping through a line, keep going if still within it. |
c906108c | 6314 | |
488f131b JB |
6315 | Note that step_range_end is the address of the first instruction |
6316 | beyond the step range, and NOT the address of the last instruction | |
31410e84 MS |
6317 | within it! |
6318 | ||
6319 | Note also that during reverse execution, we may be stepping | |
6320 | through a function epilogue and therefore must detect when | |
6321 | the current-frame changes in the middle of a line. */ | |
6322 | ||
f2ffa92b PA |
6323 | if (pc_in_thread_step_range (ecs->event_thread->suspend.stop_pc, |
6324 | ecs->event_thread) | |
31410e84 | 6325 | && (execution_direction != EXEC_REVERSE |
388a8562 | 6326 | || frame_id_eq (get_frame_id (frame), |
16c381f0 | 6327 | ecs->event_thread->control.step_frame_id))) |
488f131b | 6328 | { |
527159b7 | 6329 | if (debug_infrun) |
5af949e3 UW |
6330 | fprintf_unfiltered |
6331 | (gdb_stdlog, "infrun: stepping inside range [%s-%s]\n", | |
16c381f0 JK |
6332 | paddress (gdbarch, ecs->event_thread->control.step_range_start), |
6333 | paddress (gdbarch, ecs->event_thread->control.step_range_end)); | |
b2175913 | 6334 | |
c1e36e3e PA |
6335 | /* Tentatively re-enable range stepping; `resume' disables it if |
6336 | necessary (e.g., if we're stepping over a breakpoint or we | |
6337 | have software watchpoints). */ | |
6338 | ecs->event_thread->control.may_range_step = 1; | |
6339 | ||
b2175913 MS |
6340 | /* When stepping backward, stop at beginning of line range |
6341 | (unless it's the function entry point, in which case | |
6342 | keep going back to the call point). */ | |
f2ffa92b | 6343 | CORE_ADDR stop_pc = ecs->event_thread->suspend.stop_pc; |
16c381f0 | 6344 | if (stop_pc == ecs->event_thread->control.step_range_start |
b2175913 MS |
6345 | && stop_pc != ecs->stop_func_start |
6346 | && execution_direction == EXEC_REVERSE) | |
bdc36728 | 6347 | end_stepping_range (ecs); |
b2175913 MS |
6348 | else |
6349 | keep_going (ecs); | |
6350 | ||
488f131b JB |
6351 | return; |
6352 | } | |
c5aa993b | 6353 | |
488f131b | 6354 | /* We stepped out of the stepping range. */ |
c906108c | 6355 | |
488f131b | 6356 | /* If we are stepping at the source level and entered the runtime |
388a8562 MS |
6357 | loader dynamic symbol resolution code... |
6358 | ||
6359 | EXEC_FORWARD: we keep on single stepping until we exit the run | |
6360 | time loader code and reach the callee's address. | |
6361 | ||
6362 | EXEC_REVERSE: we've already executed the callee (backward), and | |
6363 | the runtime loader code is handled just like any other | |
6364 | undebuggable function call. Now we need only keep stepping | |
6365 | backward through the trampoline code, and that's handled further | |
6366 | down, so there is nothing for us to do here. */ | |
6367 | ||
6368 | if (execution_direction != EXEC_REVERSE | |
16c381f0 | 6369 | && ecs->event_thread->control.step_over_calls == STEP_OVER_UNDEBUGGABLE |
f2ffa92b | 6370 | && in_solib_dynsym_resolve_code (ecs->event_thread->suspend.stop_pc)) |
488f131b | 6371 | { |
4c8c40e6 | 6372 | CORE_ADDR pc_after_resolver = |
f2ffa92b PA |
6373 | gdbarch_skip_solib_resolver (gdbarch, |
6374 | ecs->event_thread->suspend.stop_pc); | |
c906108c | 6375 | |
527159b7 | 6376 | if (debug_infrun) |
3e43a32a MS |
6377 | fprintf_unfiltered (gdb_stdlog, |
6378 | "infrun: stepped into dynsym resolve code\n"); | |
527159b7 | 6379 | |
488f131b JB |
6380 | if (pc_after_resolver) |
6381 | { | |
6382 | /* Set up a step-resume breakpoint at the address | |
6383 | indicated by SKIP_SOLIB_RESOLVER. */ | |
51abb421 | 6384 | symtab_and_line sr_sal; |
488f131b | 6385 | sr_sal.pc = pc_after_resolver; |
6c95b8df | 6386 | sr_sal.pspace = get_frame_program_space (frame); |
488f131b | 6387 | |
a6d9a66e UW |
6388 | insert_step_resume_breakpoint_at_sal (gdbarch, |
6389 | sr_sal, null_frame_id); | |
c5aa993b | 6390 | } |
c906108c | 6391 | |
488f131b JB |
6392 | keep_going (ecs); |
6393 | return; | |
6394 | } | |
c906108c | 6395 | |
1d509aa6 MM |
6396 | /* Step through an indirect branch thunk. */ |
6397 | if (ecs->event_thread->control.step_over_calls != STEP_OVER_NONE | |
f2ffa92b PA |
6398 | && gdbarch_in_indirect_branch_thunk (gdbarch, |
6399 | ecs->event_thread->suspend.stop_pc)) | |
1d509aa6 MM |
6400 | { |
6401 | if (debug_infrun) | |
6402 | fprintf_unfiltered (gdb_stdlog, | |
6403 | "infrun: stepped into indirect branch thunk\n"); | |
6404 | keep_going (ecs); | |
6405 | return; | |
6406 | } | |
6407 | ||
16c381f0 JK |
6408 | if (ecs->event_thread->control.step_range_end != 1 |
6409 | && (ecs->event_thread->control.step_over_calls == STEP_OVER_UNDEBUGGABLE | |
6410 | || ecs->event_thread->control.step_over_calls == STEP_OVER_ALL) | |
568d6575 | 6411 | && get_frame_type (frame) == SIGTRAMP_FRAME) |
488f131b | 6412 | { |
527159b7 | 6413 | if (debug_infrun) |
3e43a32a MS |
6414 | fprintf_unfiltered (gdb_stdlog, |
6415 | "infrun: stepped into signal trampoline\n"); | |
42edda50 | 6416 | /* The inferior, while doing a "step" or "next", has ended up in |
8fb3e588 AC |
6417 | a signal trampoline (either by a signal being delivered or by |
6418 | the signal handler returning). Just single-step until the | |
6419 | inferior leaves the trampoline (either by calling the handler | |
6420 | or returning). */ | |
488f131b JB |
6421 | keep_going (ecs); |
6422 | return; | |
6423 | } | |
c906108c | 6424 | |
14132e89 MR |
6425 | /* If we're in the return path from a shared library trampoline, |
6426 | we want to proceed through the trampoline when stepping. */ | |
6427 | /* macro/2012-04-25: This needs to come before the subroutine | |
6428 | call check below as on some targets return trampolines look | |
6429 | like subroutine calls (MIPS16 return thunks). */ | |
6430 | if (gdbarch_in_solib_return_trampoline (gdbarch, | |
f2ffa92b PA |
6431 | ecs->event_thread->suspend.stop_pc, |
6432 | ecs->stop_func_name) | |
14132e89 MR |
6433 | && ecs->event_thread->control.step_over_calls != STEP_OVER_NONE) |
6434 | { | |
6435 | /* Determine where this trampoline returns. */ | |
f2ffa92b PA |
6436 | CORE_ADDR stop_pc = ecs->event_thread->suspend.stop_pc; |
6437 | CORE_ADDR real_stop_pc | |
6438 | = gdbarch_skip_trampoline_code (gdbarch, frame, stop_pc); | |
14132e89 MR |
6439 | |
6440 | if (debug_infrun) | |
6441 | fprintf_unfiltered (gdb_stdlog, | |
6442 | "infrun: stepped into solib return tramp\n"); | |
6443 | ||
6444 | /* Only proceed through if we know where it's going. */ | |
6445 | if (real_stop_pc) | |
6446 | { | |
6447 | /* And put the step-breakpoint there and go until there. */ | |
51abb421 | 6448 | symtab_and_line sr_sal; |
14132e89 MR |
6449 | sr_sal.pc = real_stop_pc; |
6450 | sr_sal.section = find_pc_overlay (sr_sal.pc); | |
6451 | sr_sal.pspace = get_frame_program_space (frame); | |
6452 | ||
6453 | /* Do not specify what the fp should be when we stop since | |
6454 | on some machines the prologue is where the new fp value | |
6455 | is established. */ | |
6456 | insert_step_resume_breakpoint_at_sal (gdbarch, | |
6457 | sr_sal, null_frame_id); | |
6458 | ||
6459 | /* Restart without fiddling with the step ranges or | |
6460 | other state. */ | |
6461 | keep_going (ecs); | |
6462 | return; | |
6463 | } | |
6464 | } | |
6465 | ||
c17eaafe DJ |
6466 | /* Check for subroutine calls. The check for the current frame |
6467 | equalling the step ID is not necessary - the check of the | |
6468 | previous frame's ID is sufficient - but it is a common case and | |
6469 | cheaper than checking the previous frame's ID. | |
14e60db5 DJ |
6470 | |
6471 | NOTE: frame_id_eq will never report two invalid frame IDs as | |
6472 | being equal, so to get into this block, both the current and | |
6473 | previous frame must have valid frame IDs. */ | |
005ca36a JB |
6474 | /* The outer_frame_id check is a heuristic to detect stepping |
6475 | through startup code. If we step over an instruction which | |
6476 | sets the stack pointer from an invalid value to a valid value, | |
6477 | we may detect that as a subroutine call from the mythical | |
6478 | "outermost" function. This could be fixed by marking | |
6479 | outermost frames as !stack_p,code_p,special_p. Then the | |
6480 | initial outermost frame, before sp was valid, would | |
ce6cca6d | 6481 | have code_addr == &_start. See the comment in frame_id_eq |
005ca36a | 6482 | for more. */ |
edb3359d | 6483 | if (!frame_id_eq (get_stack_frame_id (frame), |
16c381f0 | 6484 | ecs->event_thread->control.step_stack_frame_id) |
005ca36a | 6485 | && (frame_id_eq (frame_unwind_caller_id (get_current_frame ()), |
16c381f0 JK |
6486 | ecs->event_thread->control.step_stack_frame_id) |
6487 | && (!frame_id_eq (ecs->event_thread->control.step_stack_frame_id, | |
005ca36a | 6488 | outer_frame_id) |
885eeb5b | 6489 | || (ecs->event_thread->control.step_start_function |
f2ffa92b | 6490 | != find_pc_function (ecs->event_thread->suspend.stop_pc))))) |
488f131b | 6491 | { |
f2ffa92b | 6492 | CORE_ADDR stop_pc = ecs->event_thread->suspend.stop_pc; |
95918acb | 6493 | CORE_ADDR real_stop_pc; |
8fb3e588 | 6494 | |
527159b7 | 6495 | if (debug_infrun) |
8a9de0e4 | 6496 | fprintf_unfiltered (gdb_stdlog, "infrun: stepped into subroutine\n"); |
527159b7 | 6497 | |
b7a084be | 6498 | if (ecs->event_thread->control.step_over_calls == STEP_OVER_NONE) |
95918acb AC |
6499 | { |
6500 | /* I presume that step_over_calls is only 0 when we're | |
6501 | supposed to be stepping at the assembly language level | |
6502 | ("stepi"). Just stop. */ | |
388a8562 | 6503 | /* And this works the same backward as frontward. MVS */ |
bdc36728 | 6504 | end_stepping_range (ecs); |
95918acb AC |
6505 | return; |
6506 | } | |
8fb3e588 | 6507 | |
388a8562 MS |
6508 | /* Reverse stepping through solib trampolines. */ |
6509 | ||
6510 | if (execution_direction == EXEC_REVERSE | |
16c381f0 | 6511 | && ecs->event_thread->control.step_over_calls != STEP_OVER_NONE |
388a8562 MS |
6512 | && (gdbarch_skip_trampoline_code (gdbarch, frame, stop_pc) |
6513 | || (ecs->stop_func_start == 0 | |
6514 | && in_solib_dynsym_resolve_code (stop_pc)))) | |
6515 | { | |
6516 | /* Any solib trampoline code can be handled in reverse | |
6517 | by simply continuing to single-step. We have already | |
6518 | executed the solib function (backwards), and a few | |
6519 | steps will take us back through the trampoline to the | |
6520 | caller. */ | |
6521 | keep_going (ecs); | |
6522 | return; | |
6523 | } | |
6524 | ||
16c381f0 | 6525 | if (ecs->event_thread->control.step_over_calls == STEP_OVER_ALL) |
8567c30f | 6526 | { |
b2175913 MS |
6527 | /* We're doing a "next". |
6528 | ||
6529 | Normal (forward) execution: set a breakpoint at the | |
6530 | callee's return address (the address at which the caller | |
6531 | will resume). | |
6532 | ||
6533 | Reverse (backward) execution. set the step-resume | |
6534 | breakpoint at the start of the function that we just | |
6535 | stepped into (backwards), and continue to there. When we | |
6130d0b7 | 6536 | get there, we'll need to single-step back to the caller. */ |
b2175913 MS |
6537 | |
6538 | if (execution_direction == EXEC_REVERSE) | |
6539 | { | |
acf9414f JK |
6540 | /* If we're already at the start of the function, we've either |
6541 | just stepped backward into a single instruction function, | |
6542 | or stepped back out of a signal handler to the first instruction | |
6543 | of the function. Just keep going, which will single-step back | |
6544 | to the caller. */ | |
58c48e72 | 6545 | if (ecs->stop_func_start != stop_pc && ecs->stop_func_start != 0) |
acf9414f | 6546 | { |
acf9414f | 6547 | /* Normal function call return (static or dynamic). */ |
51abb421 | 6548 | symtab_and_line sr_sal; |
acf9414f JK |
6549 | sr_sal.pc = ecs->stop_func_start; |
6550 | sr_sal.pspace = get_frame_program_space (frame); | |
6551 | insert_step_resume_breakpoint_at_sal (gdbarch, | |
6552 | sr_sal, null_frame_id); | |
6553 | } | |
b2175913 MS |
6554 | } |
6555 | else | |
568d6575 | 6556 | insert_step_resume_breakpoint_at_caller (frame); |
b2175913 | 6557 | |
8567c30f AC |
6558 | keep_going (ecs); |
6559 | return; | |
6560 | } | |
a53c66de | 6561 | |
95918acb | 6562 | /* If we are in a function call trampoline (a stub between the |
8fb3e588 AC |
6563 | calling routine and the real function), locate the real |
6564 | function. That's what tells us (a) whether we want to step | |
6565 | into it at all, and (b) what prologue we want to run to the | |
6566 | end of, if we do step into it. */ | |
568d6575 | 6567 | real_stop_pc = skip_language_trampoline (frame, stop_pc); |
95918acb | 6568 | if (real_stop_pc == 0) |
568d6575 | 6569 | real_stop_pc = gdbarch_skip_trampoline_code (gdbarch, frame, stop_pc); |
95918acb AC |
6570 | if (real_stop_pc != 0) |
6571 | ecs->stop_func_start = real_stop_pc; | |
8fb3e588 | 6572 | |
db5f024e | 6573 | if (real_stop_pc != 0 && in_solib_dynsym_resolve_code (real_stop_pc)) |
1b2bfbb9 | 6574 | { |
51abb421 | 6575 | symtab_and_line sr_sal; |
1b2bfbb9 | 6576 | sr_sal.pc = ecs->stop_func_start; |
6c95b8df | 6577 | sr_sal.pspace = get_frame_program_space (frame); |
1b2bfbb9 | 6578 | |
a6d9a66e UW |
6579 | insert_step_resume_breakpoint_at_sal (gdbarch, |
6580 | sr_sal, null_frame_id); | |
8fb3e588 AC |
6581 | keep_going (ecs); |
6582 | return; | |
1b2bfbb9 RC |
6583 | } |
6584 | ||
95918acb | 6585 | /* If we have line number information for the function we are |
1bfeeb0f JL |
6586 | thinking of stepping into and the function isn't on the skip |
6587 | list, step into it. | |
95918acb | 6588 | |
8fb3e588 AC |
6589 | If there are several symtabs at that PC (e.g. with include |
6590 | files), just want to know whether *any* of them have line | |
6591 | numbers. find_pc_line handles this. */ | |
95918acb AC |
6592 | { |
6593 | struct symtab_and_line tmp_sal; | |
8fb3e588 | 6594 | |
95918acb | 6595 | tmp_sal = find_pc_line (ecs->stop_func_start, 0); |
2b914b52 | 6596 | if (tmp_sal.line != 0 |
85817405 | 6597 | && !function_name_is_marked_for_skip (ecs->stop_func_name, |
de7985c3 | 6598 | tmp_sal)) |
95918acb | 6599 | { |
b2175913 | 6600 | if (execution_direction == EXEC_REVERSE) |
568d6575 | 6601 | handle_step_into_function_backward (gdbarch, ecs); |
b2175913 | 6602 | else |
568d6575 | 6603 | handle_step_into_function (gdbarch, ecs); |
95918acb AC |
6604 | return; |
6605 | } | |
6606 | } | |
6607 | ||
6608 | /* If we have no line number and the step-stop-if-no-debug is | |
8fb3e588 AC |
6609 | set, we stop the step so that the user has a chance to switch |
6610 | in assembly mode. */ | |
16c381f0 | 6611 | if (ecs->event_thread->control.step_over_calls == STEP_OVER_UNDEBUGGABLE |
078130d0 | 6612 | && step_stop_if_no_debug) |
95918acb | 6613 | { |
bdc36728 | 6614 | end_stepping_range (ecs); |
95918acb AC |
6615 | return; |
6616 | } | |
6617 | ||
b2175913 MS |
6618 | if (execution_direction == EXEC_REVERSE) |
6619 | { | |
acf9414f JK |
6620 | /* If we're already at the start of the function, we've either just |
6621 | stepped backward into a single instruction function without line | |
6622 | number info, or stepped back out of a signal handler to the first | |
6623 | instruction of the function without line number info. Just keep | |
6624 | going, which will single-step back to the caller. */ | |
6625 | if (ecs->stop_func_start != stop_pc) | |
6626 | { | |
6627 | /* Set a breakpoint at callee's start address. | |
6628 | From there we can step once and be back in the caller. */ | |
51abb421 | 6629 | symtab_and_line sr_sal; |
acf9414f JK |
6630 | sr_sal.pc = ecs->stop_func_start; |
6631 | sr_sal.pspace = get_frame_program_space (frame); | |
6632 | insert_step_resume_breakpoint_at_sal (gdbarch, | |
6633 | sr_sal, null_frame_id); | |
6634 | } | |
b2175913 MS |
6635 | } |
6636 | else | |
6637 | /* Set a breakpoint at callee's return address (the address | |
6638 | at which the caller will resume). */ | |
568d6575 | 6639 | insert_step_resume_breakpoint_at_caller (frame); |
b2175913 | 6640 | |
95918acb | 6641 | keep_going (ecs); |
488f131b | 6642 | return; |
488f131b | 6643 | } |
c906108c | 6644 | |
fdd654f3 MS |
6645 | /* Reverse stepping through solib trampolines. */ |
6646 | ||
6647 | if (execution_direction == EXEC_REVERSE | |
16c381f0 | 6648 | && ecs->event_thread->control.step_over_calls != STEP_OVER_NONE) |
fdd654f3 | 6649 | { |
f2ffa92b PA |
6650 | CORE_ADDR stop_pc = ecs->event_thread->suspend.stop_pc; |
6651 | ||
fdd654f3 MS |
6652 | if (gdbarch_skip_trampoline_code (gdbarch, frame, stop_pc) |
6653 | || (ecs->stop_func_start == 0 | |
6654 | && in_solib_dynsym_resolve_code (stop_pc))) | |
6655 | { | |
6656 | /* Any solib trampoline code can be handled in reverse | |
6657 | by simply continuing to single-step. We have already | |
6658 | executed the solib function (backwards), and a few | |
6659 | steps will take us back through the trampoline to the | |
6660 | caller. */ | |
6661 | keep_going (ecs); | |
6662 | return; | |
6663 | } | |
6664 | else if (in_solib_dynsym_resolve_code (stop_pc)) | |
6665 | { | |
6666 | /* Stepped backward into the solib dynsym resolver. | |
6667 | Set a breakpoint at its start and continue, then | |
6668 | one more step will take us out. */ | |
51abb421 | 6669 | symtab_and_line sr_sal; |
fdd654f3 | 6670 | sr_sal.pc = ecs->stop_func_start; |
9d1807c3 | 6671 | sr_sal.pspace = get_frame_program_space (frame); |
fdd654f3 MS |
6672 | insert_step_resume_breakpoint_at_sal (gdbarch, |
6673 | sr_sal, null_frame_id); | |
6674 | keep_going (ecs); | |
6675 | return; | |
6676 | } | |
6677 | } | |
6678 | ||
f2ffa92b | 6679 | stop_pc_sal = find_pc_line (ecs->event_thread->suspend.stop_pc, 0); |
7ed0fe66 | 6680 | |
1b2bfbb9 RC |
6681 | /* NOTE: tausq/2004-05-24: This if block used to be done before all |
6682 | the trampoline processing logic, however, there are some trampolines | |
6683 | that have no names, so we should do trampoline handling first. */ | |
16c381f0 | 6684 | if (ecs->event_thread->control.step_over_calls == STEP_OVER_UNDEBUGGABLE |
7ed0fe66 | 6685 | && ecs->stop_func_name == NULL |
2afb61aa | 6686 | && stop_pc_sal.line == 0) |
1b2bfbb9 | 6687 | { |
527159b7 | 6688 | if (debug_infrun) |
3e43a32a MS |
6689 | fprintf_unfiltered (gdb_stdlog, |
6690 | "infrun: stepped into undebuggable function\n"); | |
527159b7 | 6691 | |
1b2bfbb9 | 6692 | /* The inferior just stepped into, or returned to, an |
7ed0fe66 DJ |
6693 | undebuggable function (where there is no debugging information |
6694 | and no line number corresponding to the address where the | |
1b2bfbb9 RC |
6695 | inferior stopped). Since we want to skip this kind of code, |
6696 | we keep going until the inferior returns from this | |
14e60db5 DJ |
6697 | function - unless the user has asked us not to (via |
6698 | set step-mode) or we no longer know how to get back | |
6699 | to the call site. */ | |
6700 | if (step_stop_if_no_debug | |
c7ce8faa | 6701 | || !frame_id_p (frame_unwind_caller_id (frame))) |
1b2bfbb9 RC |
6702 | { |
6703 | /* If we have no line number and the step-stop-if-no-debug | |
6704 | is set, we stop the step so that the user has a chance to | |
6705 | switch in assembly mode. */ | |
bdc36728 | 6706 | end_stepping_range (ecs); |
1b2bfbb9 RC |
6707 | return; |
6708 | } | |
6709 | else | |
6710 | { | |
6711 | /* Set a breakpoint at callee's return address (the address | |
6712 | at which the caller will resume). */ | |
568d6575 | 6713 | insert_step_resume_breakpoint_at_caller (frame); |
1b2bfbb9 RC |
6714 | keep_going (ecs); |
6715 | return; | |
6716 | } | |
6717 | } | |
6718 | ||
16c381f0 | 6719 | if (ecs->event_thread->control.step_range_end == 1) |
1b2bfbb9 RC |
6720 | { |
6721 | /* It is stepi or nexti. We always want to stop stepping after | |
6722 | one instruction. */ | |
527159b7 | 6723 | if (debug_infrun) |
8a9de0e4 | 6724 | fprintf_unfiltered (gdb_stdlog, "infrun: stepi/nexti\n"); |
bdc36728 | 6725 | end_stepping_range (ecs); |
1b2bfbb9 RC |
6726 | return; |
6727 | } | |
6728 | ||
2afb61aa | 6729 | if (stop_pc_sal.line == 0) |
488f131b JB |
6730 | { |
6731 | /* We have no line number information. That means to stop | |
6732 | stepping (does this always happen right after one instruction, | |
6733 | when we do "s" in a function with no line numbers, | |
6734 | or can this happen as a result of a return or longjmp?). */ | |
527159b7 | 6735 | if (debug_infrun) |
8a9de0e4 | 6736 | fprintf_unfiltered (gdb_stdlog, "infrun: no line number info\n"); |
bdc36728 | 6737 | end_stepping_range (ecs); |
488f131b JB |
6738 | return; |
6739 | } | |
c906108c | 6740 | |
edb3359d DJ |
6741 | /* Look for "calls" to inlined functions, part one. If the inline |
6742 | frame machinery detected some skipped call sites, we have entered | |
6743 | a new inline function. */ | |
6744 | ||
6745 | if (frame_id_eq (get_frame_id (get_current_frame ()), | |
16c381f0 | 6746 | ecs->event_thread->control.step_frame_id) |
00431a78 | 6747 | && inline_skipped_frames (ecs->event_thread)) |
edb3359d | 6748 | { |
edb3359d DJ |
6749 | if (debug_infrun) |
6750 | fprintf_unfiltered (gdb_stdlog, | |
6751 | "infrun: stepped into inlined function\n"); | |
6752 | ||
51abb421 | 6753 | symtab_and_line call_sal = find_frame_sal (get_current_frame ()); |
edb3359d | 6754 | |
16c381f0 | 6755 | if (ecs->event_thread->control.step_over_calls != STEP_OVER_ALL) |
edb3359d DJ |
6756 | { |
6757 | /* For "step", we're going to stop. But if the call site | |
6758 | for this inlined function is on the same source line as | |
6759 | we were previously stepping, go down into the function | |
6760 | first. Otherwise stop at the call site. */ | |
6761 | ||
6762 | if (call_sal.line == ecs->event_thread->current_line | |
6763 | && call_sal.symtab == ecs->event_thread->current_symtab) | |
00431a78 | 6764 | step_into_inline_frame (ecs->event_thread); |
edb3359d | 6765 | |
bdc36728 | 6766 | end_stepping_range (ecs); |
edb3359d DJ |
6767 | return; |
6768 | } | |
6769 | else | |
6770 | { | |
6771 | /* For "next", we should stop at the call site if it is on a | |
6772 | different source line. Otherwise continue through the | |
6773 | inlined function. */ | |
6774 | if (call_sal.line == ecs->event_thread->current_line | |
6775 | && call_sal.symtab == ecs->event_thread->current_symtab) | |
6776 | keep_going (ecs); | |
6777 | else | |
bdc36728 | 6778 | end_stepping_range (ecs); |
edb3359d DJ |
6779 | return; |
6780 | } | |
6781 | } | |
6782 | ||
6783 | /* Look for "calls" to inlined functions, part two. If we are still | |
6784 | in the same real function we were stepping through, but we have | |
6785 | to go further up to find the exact frame ID, we are stepping | |
6786 | through a more inlined call beyond its call site. */ | |
6787 | ||
6788 | if (get_frame_type (get_current_frame ()) == INLINE_FRAME | |
6789 | && !frame_id_eq (get_frame_id (get_current_frame ()), | |
16c381f0 | 6790 | ecs->event_thread->control.step_frame_id) |
edb3359d | 6791 | && stepped_in_from (get_current_frame (), |
16c381f0 | 6792 | ecs->event_thread->control.step_frame_id)) |
edb3359d DJ |
6793 | { |
6794 | if (debug_infrun) | |
6795 | fprintf_unfiltered (gdb_stdlog, | |
6796 | "infrun: stepping through inlined function\n"); | |
6797 | ||
16c381f0 | 6798 | if (ecs->event_thread->control.step_over_calls == STEP_OVER_ALL) |
edb3359d DJ |
6799 | keep_going (ecs); |
6800 | else | |
bdc36728 | 6801 | end_stepping_range (ecs); |
edb3359d DJ |
6802 | return; |
6803 | } | |
6804 | ||
f2ffa92b | 6805 | if ((ecs->event_thread->suspend.stop_pc == stop_pc_sal.pc) |
4e1c45ea PA |
6806 | && (ecs->event_thread->current_line != stop_pc_sal.line |
6807 | || ecs->event_thread->current_symtab != stop_pc_sal.symtab)) | |
488f131b JB |
6808 | { |
6809 | /* We are at the start of a different line. So stop. Note that | |
6810 | we don't stop if we step into the middle of a different line. | |
6811 | That is said to make things like for (;;) statements work | |
6812 | better. */ | |
527159b7 | 6813 | if (debug_infrun) |
3e43a32a MS |
6814 | fprintf_unfiltered (gdb_stdlog, |
6815 | "infrun: stepped to a different line\n"); | |
bdc36728 | 6816 | end_stepping_range (ecs); |
488f131b JB |
6817 | return; |
6818 | } | |
c906108c | 6819 | |
488f131b | 6820 | /* We aren't done stepping. |
c906108c | 6821 | |
488f131b JB |
6822 | Optimize by setting the stepping range to the line. |
6823 | (We might not be in the original line, but if we entered a | |
6824 | new line in mid-statement, we continue stepping. This makes | |
6825 | things like for(;;) statements work better.) */ | |
c906108c | 6826 | |
16c381f0 JK |
6827 | ecs->event_thread->control.step_range_start = stop_pc_sal.pc; |
6828 | ecs->event_thread->control.step_range_end = stop_pc_sal.end; | |
c1e36e3e | 6829 | ecs->event_thread->control.may_range_step = 1; |
edb3359d | 6830 | set_step_info (frame, stop_pc_sal); |
488f131b | 6831 | |
527159b7 | 6832 | if (debug_infrun) |
8a9de0e4 | 6833 | fprintf_unfiltered (gdb_stdlog, "infrun: keep going\n"); |
488f131b | 6834 | keep_going (ecs); |
104c1213 JM |
6835 | } |
6836 | ||
c447ac0b PA |
6837 | /* In all-stop mode, if we're currently stepping but have stopped in |
6838 | some other thread, we may need to switch back to the stepped | |
6839 | thread. Returns true we set the inferior running, false if we left | |
6840 | it stopped (and the event needs further processing). */ | |
6841 | ||
6842 | static int | |
6843 | switch_back_to_stepped_thread (struct execution_control_state *ecs) | |
6844 | { | |
fbea99ea | 6845 | if (!target_is_non_stop_p ()) |
c447ac0b | 6846 | { |
99619bea PA |
6847 | struct thread_info *stepping_thread; |
6848 | ||
6849 | /* If any thread is blocked on some internal breakpoint, and we | |
6850 | simply need to step over that breakpoint to get it going | |
6851 | again, do that first. */ | |
6852 | ||
6853 | /* However, if we see an event for the stepping thread, then we | |
6854 | know all other threads have been moved past their breakpoints | |
6855 | already. Let the caller check whether the step is finished, | |
6856 | etc., before deciding to move it past a breakpoint. */ | |
6857 | if (ecs->event_thread->control.step_range_end != 0) | |
6858 | return 0; | |
6859 | ||
6860 | /* Check if the current thread is blocked on an incomplete | |
6861 | step-over, interrupted by a random signal. */ | |
6862 | if (ecs->event_thread->control.trap_expected | |
6863 | && ecs->event_thread->suspend.stop_signal != GDB_SIGNAL_TRAP) | |
c447ac0b | 6864 | { |
99619bea PA |
6865 | if (debug_infrun) |
6866 | { | |
6867 | fprintf_unfiltered (gdb_stdlog, | |
6868 | "infrun: need to finish step-over of [%s]\n", | |
6869 | target_pid_to_str (ecs->event_thread->ptid)); | |
6870 | } | |
6871 | keep_going (ecs); | |
6872 | return 1; | |
6873 | } | |
2adfaa28 | 6874 | |
99619bea PA |
6875 | /* Check if the current thread is blocked by a single-step |
6876 | breakpoint of another thread. */ | |
6877 | if (ecs->hit_singlestep_breakpoint) | |
6878 | { | |
6879 | if (debug_infrun) | |
6880 | { | |
6881 | fprintf_unfiltered (gdb_stdlog, | |
6882 | "infrun: need to step [%s] over single-step " | |
6883 | "breakpoint\n", | |
6884 | target_pid_to_str (ecs->ptid)); | |
6885 | } | |
6886 | keep_going (ecs); | |
6887 | return 1; | |
6888 | } | |
6889 | ||
4d9d9d04 PA |
6890 | /* If this thread needs yet another step-over (e.g., stepping |
6891 | through a delay slot), do it first before moving on to | |
6892 | another thread. */ | |
6893 | if (thread_still_needs_step_over (ecs->event_thread)) | |
6894 | { | |
6895 | if (debug_infrun) | |
6896 | { | |
6897 | fprintf_unfiltered (gdb_stdlog, | |
6898 | "infrun: thread [%s] still needs step-over\n", | |
6899 | target_pid_to_str (ecs->event_thread->ptid)); | |
6900 | } | |
6901 | keep_going (ecs); | |
6902 | return 1; | |
6903 | } | |
70509625 | 6904 | |
483805cf PA |
6905 | /* If scheduler locking applies even if not stepping, there's no |
6906 | need to walk over threads. Above we've checked whether the | |
6907 | current thread is stepping. If some other thread not the | |
6908 | event thread is stepping, then it must be that scheduler | |
6909 | locking is not in effect. */ | |
856e7dd6 | 6910 | if (schedlock_applies (ecs->event_thread)) |
483805cf PA |
6911 | return 0; |
6912 | ||
4d9d9d04 PA |
6913 | /* Otherwise, we no longer expect a trap in the current thread. |
6914 | Clear the trap_expected flag before switching back -- this is | |
6915 | what keep_going does as well, if we call it. */ | |
6916 | ecs->event_thread->control.trap_expected = 0; | |
6917 | ||
6918 | /* Likewise, clear the signal if it should not be passed. */ | |
6919 | if (!signal_program[ecs->event_thread->suspend.stop_signal]) | |
6920 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; | |
6921 | ||
6922 | /* Do all pending step-overs before actually proceeding with | |
483805cf | 6923 | step/next/etc. */ |
4d9d9d04 PA |
6924 | if (start_step_over ()) |
6925 | { | |
6926 | prepare_to_wait (ecs); | |
6927 | return 1; | |
6928 | } | |
6929 | ||
6930 | /* Look for the stepping/nexting thread. */ | |
483805cf | 6931 | stepping_thread = NULL; |
4d9d9d04 | 6932 | |
08036331 | 6933 | for (thread_info *tp : all_non_exited_threads ()) |
483805cf | 6934 | { |
fbea99ea PA |
6935 | /* Ignore threads of processes the caller is not |
6936 | resuming. */ | |
483805cf | 6937 | if (!sched_multi |
e99b03dc | 6938 | && tp->ptid.pid () != ecs->ptid.pid ()) |
483805cf PA |
6939 | continue; |
6940 | ||
6941 | /* When stepping over a breakpoint, we lock all threads | |
6942 | except the one that needs to move past the breakpoint. | |
6943 | If a non-event thread has this set, the "incomplete | |
6944 | step-over" check above should have caught it earlier. */ | |
372316f1 PA |
6945 | if (tp->control.trap_expected) |
6946 | { | |
6947 | internal_error (__FILE__, __LINE__, | |
6948 | "[%s] has inconsistent state: " | |
6949 | "trap_expected=%d\n", | |
6950 | target_pid_to_str (tp->ptid), | |
6951 | tp->control.trap_expected); | |
6952 | } | |
483805cf PA |
6953 | |
6954 | /* Did we find the stepping thread? */ | |
6955 | if (tp->control.step_range_end) | |
6956 | { | |
6957 | /* Yep. There should only one though. */ | |
6958 | gdb_assert (stepping_thread == NULL); | |
6959 | ||
6960 | /* The event thread is handled at the top, before we | |
6961 | enter this loop. */ | |
6962 | gdb_assert (tp != ecs->event_thread); | |
6963 | ||
6964 | /* If some thread other than the event thread is | |
6965 | stepping, then scheduler locking can't be in effect, | |
6966 | otherwise we wouldn't have resumed the current event | |
6967 | thread in the first place. */ | |
856e7dd6 | 6968 | gdb_assert (!schedlock_applies (tp)); |
483805cf PA |
6969 | |
6970 | stepping_thread = tp; | |
6971 | } | |
99619bea PA |
6972 | } |
6973 | ||
483805cf | 6974 | if (stepping_thread != NULL) |
99619bea | 6975 | { |
c447ac0b PA |
6976 | if (debug_infrun) |
6977 | fprintf_unfiltered (gdb_stdlog, | |
6978 | "infrun: switching back to stepped thread\n"); | |
6979 | ||
2ac7589c PA |
6980 | if (keep_going_stepped_thread (stepping_thread)) |
6981 | { | |
6982 | prepare_to_wait (ecs); | |
6983 | return 1; | |
6984 | } | |
6985 | } | |
6986 | } | |
2adfaa28 | 6987 | |
2ac7589c PA |
6988 | return 0; |
6989 | } | |
2adfaa28 | 6990 | |
2ac7589c PA |
6991 | /* Set a previously stepped thread back to stepping. Returns true on |
6992 | success, false if the resume is not possible (e.g., the thread | |
6993 | vanished). */ | |
6994 | ||
6995 | static int | |
6996 | keep_going_stepped_thread (struct thread_info *tp) | |
6997 | { | |
6998 | struct frame_info *frame; | |
2ac7589c PA |
6999 | struct execution_control_state ecss; |
7000 | struct execution_control_state *ecs = &ecss; | |
2adfaa28 | 7001 | |
2ac7589c PA |
7002 | /* If the stepping thread exited, then don't try to switch back and |
7003 | resume it, which could fail in several different ways depending | |
7004 | on the target. Instead, just keep going. | |
2adfaa28 | 7005 | |
2ac7589c PA |
7006 | We can find a stepping dead thread in the thread list in two |
7007 | cases: | |
2adfaa28 | 7008 | |
2ac7589c PA |
7009 | - The target supports thread exit events, and when the target |
7010 | tries to delete the thread from the thread list, inferior_ptid | |
7011 | pointed at the exiting thread. In such case, calling | |
7012 | delete_thread does not really remove the thread from the list; | |
7013 | instead, the thread is left listed, with 'exited' state. | |
64ce06e4 | 7014 | |
2ac7589c PA |
7015 | - The target's debug interface does not support thread exit |
7016 | events, and so we have no idea whatsoever if the previously | |
7017 | stepping thread is still alive. For that reason, we need to | |
7018 | synchronously query the target now. */ | |
2adfaa28 | 7019 | |
00431a78 | 7020 | if (tp->state == THREAD_EXITED || !target_thread_alive (tp->ptid)) |
2ac7589c PA |
7021 | { |
7022 | if (debug_infrun) | |
7023 | fprintf_unfiltered (gdb_stdlog, | |
7024 | "infrun: not resuming previously " | |
7025 | "stepped thread, it has vanished\n"); | |
7026 | ||
00431a78 | 7027 | delete_thread (tp); |
2ac7589c | 7028 | return 0; |
c447ac0b | 7029 | } |
2ac7589c PA |
7030 | |
7031 | if (debug_infrun) | |
7032 | fprintf_unfiltered (gdb_stdlog, | |
7033 | "infrun: resuming previously stepped thread\n"); | |
7034 | ||
7035 | reset_ecs (ecs, tp); | |
00431a78 | 7036 | switch_to_thread (tp); |
2ac7589c | 7037 | |
f2ffa92b | 7038 | tp->suspend.stop_pc = regcache_read_pc (get_thread_regcache (tp)); |
2ac7589c | 7039 | frame = get_current_frame (); |
2ac7589c PA |
7040 | |
7041 | /* If the PC of the thread we were trying to single-step has | |
7042 | changed, then that thread has trapped or been signaled, but the | |
7043 | event has not been reported to GDB yet. Re-poll the target | |
7044 | looking for this particular thread's event (i.e. temporarily | |
7045 | enable schedlock) by: | |
7046 | ||
7047 | - setting a break at the current PC | |
7048 | - resuming that particular thread, only (by setting trap | |
7049 | expected) | |
7050 | ||
7051 | This prevents us continuously moving the single-step breakpoint | |
7052 | forward, one instruction at a time, overstepping. */ | |
7053 | ||
f2ffa92b | 7054 | if (tp->suspend.stop_pc != tp->prev_pc) |
2ac7589c PA |
7055 | { |
7056 | ptid_t resume_ptid; | |
7057 | ||
7058 | if (debug_infrun) | |
7059 | fprintf_unfiltered (gdb_stdlog, | |
7060 | "infrun: expected thread advanced also (%s -> %s)\n", | |
7061 | paddress (target_gdbarch (), tp->prev_pc), | |
f2ffa92b | 7062 | paddress (target_gdbarch (), tp->suspend.stop_pc)); |
2ac7589c PA |
7063 | |
7064 | /* Clear the info of the previous step-over, as it's no longer | |
7065 | valid (if the thread was trying to step over a breakpoint, it | |
7066 | has already succeeded). It's what keep_going would do too, | |
7067 | if we called it. Do this before trying to insert the sss | |
7068 | breakpoint, otherwise if we were previously trying to step | |
7069 | over this exact address in another thread, the breakpoint is | |
7070 | skipped. */ | |
7071 | clear_step_over_info (); | |
7072 | tp->control.trap_expected = 0; | |
7073 | ||
7074 | insert_single_step_breakpoint (get_frame_arch (frame), | |
7075 | get_frame_address_space (frame), | |
f2ffa92b | 7076 | tp->suspend.stop_pc); |
2ac7589c | 7077 | |
372316f1 | 7078 | tp->resumed = 1; |
fbea99ea | 7079 | resume_ptid = internal_resume_ptid (tp->control.stepping_command); |
2ac7589c PA |
7080 | do_target_resume (resume_ptid, 0, GDB_SIGNAL_0); |
7081 | } | |
7082 | else | |
7083 | { | |
7084 | if (debug_infrun) | |
7085 | fprintf_unfiltered (gdb_stdlog, | |
7086 | "infrun: expected thread still hasn't advanced\n"); | |
7087 | ||
7088 | keep_going_pass_signal (ecs); | |
7089 | } | |
7090 | return 1; | |
c447ac0b PA |
7091 | } |
7092 | ||
8b061563 PA |
7093 | /* Is thread TP in the middle of (software or hardware) |
7094 | single-stepping? (Note the result of this function must never be | |
7095 | passed directly as target_resume's STEP parameter.) */ | |
104c1213 | 7096 | |
a289b8f6 | 7097 | static int |
b3444185 | 7098 | currently_stepping (struct thread_info *tp) |
a7212384 | 7099 | { |
8358c15c JK |
7100 | return ((tp->control.step_range_end |
7101 | && tp->control.step_resume_breakpoint == NULL) | |
7102 | || tp->control.trap_expected | |
af48d08f | 7103 | || tp->stepped_breakpoint |
8358c15c | 7104 | || bpstat_should_step ()); |
a7212384 UW |
7105 | } |
7106 | ||
b2175913 MS |
7107 | /* Inferior has stepped into a subroutine call with source code that |
7108 | we should not step over. Do step to the first line of code in | |
7109 | it. */ | |
c2c6d25f JM |
7110 | |
7111 | static void | |
568d6575 UW |
7112 | handle_step_into_function (struct gdbarch *gdbarch, |
7113 | struct execution_control_state *ecs) | |
c2c6d25f | 7114 | { |
7e324e48 GB |
7115 | fill_in_stop_func (gdbarch, ecs); |
7116 | ||
f2ffa92b PA |
7117 | compunit_symtab *cust |
7118 | = 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); | |
c2c6d25f | 7122 | |
51abb421 | 7123 | symtab_and_line stop_func_sal = find_pc_line (ecs->stop_func_start, 0); |
c2c6d25f JM |
7124 | /* Use the step_resume_break to step until the end of the prologue, |
7125 | even if that involves jumps (as it seems to on the vax under | |
7126 | 4.2). */ | |
7127 | /* If the prologue ends in the middle of a source line, continue to | |
7128 | the end of that source line (if it is still within the function). | |
7129 | Otherwise, just go to end of prologue. */ | |
2afb61aa PA |
7130 | if (stop_func_sal.end |
7131 | && stop_func_sal.pc != ecs->stop_func_start | |
7132 | && stop_func_sal.end < ecs->stop_func_end) | |
7133 | ecs->stop_func_start = stop_func_sal.end; | |
c2c6d25f | 7134 | |
2dbd5e30 KB |
7135 | /* Architectures which require breakpoint adjustment might not be able |
7136 | to place a breakpoint at the computed address. If so, the test | |
7137 | ``ecs->stop_func_start == stop_pc'' will never succeed. Adjust | |
7138 | ecs->stop_func_start to an address at which a breakpoint may be | |
7139 | legitimately placed. | |
8fb3e588 | 7140 | |
2dbd5e30 KB |
7141 | Note: kevinb/2004-01-19: On FR-V, if this adjustment is not |
7142 | made, GDB will enter an infinite loop when stepping through | |
7143 | optimized code consisting of VLIW instructions which contain | |
7144 | subinstructions corresponding to different source lines. On | |
7145 | FR-V, it's not permitted to place a breakpoint on any but the | |
7146 | first subinstruction of a VLIW instruction. When a breakpoint is | |
7147 | set, GDB will adjust the breakpoint address to the beginning of | |
7148 | the VLIW instruction. Thus, we need to make the corresponding | |
7149 | adjustment here when computing the stop address. */ | |
8fb3e588 | 7150 | |
568d6575 | 7151 | if (gdbarch_adjust_breakpoint_address_p (gdbarch)) |
2dbd5e30 KB |
7152 | { |
7153 | ecs->stop_func_start | |
568d6575 | 7154 | = gdbarch_adjust_breakpoint_address (gdbarch, |
8fb3e588 | 7155 | ecs->stop_func_start); |
2dbd5e30 KB |
7156 | } |
7157 | ||
f2ffa92b | 7158 | if (ecs->stop_func_start == ecs->event_thread->suspend.stop_pc) |
c2c6d25f JM |
7159 | { |
7160 | /* We are already there: stop now. */ | |
bdc36728 | 7161 | end_stepping_range (ecs); |
c2c6d25f JM |
7162 | return; |
7163 | } | |
7164 | else | |
7165 | { | |
7166 | /* Put the step-breakpoint there and go until there. */ | |
51abb421 | 7167 | symtab_and_line sr_sal; |
c2c6d25f JM |
7168 | sr_sal.pc = ecs->stop_func_start; |
7169 | sr_sal.section = find_pc_overlay (ecs->stop_func_start); | |
6c95b8df | 7170 | sr_sal.pspace = get_frame_program_space (get_current_frame ()); |
44cbf7b5 | 7171 | |
c2c6d25f | 7172 | /* Do not specify what the fp should be when we stop since on |
488f131b JB |
7173 | some machines the prologue is where the new fp value is |
7174 | established. */ | |
a6d9a66e | 7175 | insert_step_resume_breakpoint_at_sal (gdbarch, sr_sal, null_frame_id); |
c2c6d25f JM |
7176 | |
7177 | /* And make sure stepping stops right away then. */ | |
16c381f0 JK |
7178 | ecs->event_thread->control.step_range_end |
7179 | = ecs->event_thread->control.step_range_start; | |
c2c6d25f JM |
7180 | } |
7181 | keep_going (ecs); | |
7182 | } | |
d4f3574e | 7183 | |
b2175913 MS |
7184 | /* Inferior has stepped backward into a subroutine call with source |
7185 | code that we should not step over. Do step to the beginning of the | |
7186 | last line of code in it. */ | |
7187 | ||
7188 | static void | |
568d6575 UW |
7189 | handle_step_into_function_backward (struct gdbarch *gdbarch, |
7190 | struct execution_control_state *ecs) | |
b2175913 | 7191 | { |
43f3e411 | 7192 | struct compunit_symtab *cust; |
167e4384 | 7193 | struct symtab_and_line stop_func_sal; |
b2175913 | 7194 | |
7e324e48 GB |
7195 | fill_in_stop_func (gdbarch, ecs); |
7196 | ||
f2ffa92b | 7197 | cust = find_pc_compunit_symtab (ecs->event_thread->suspend.stop_pc); |
43f3e411 | 7198 | if (cust != NULL && compunit_language (cust) != language_asm) |
46a62268 YQ |
7199 | ecs->stop_func_start |
7200 | = gdbarch_skip_prologue_noexcept (gdbarch, ecs->stop_func_start); | |
b2175913 | 7201 | |
f2ffa92b | 7202 | stop_func_sal = find_pc_line (ecs->event_thread->suspend.stop_pc, 0); |
b2175913 MS |
7203 | |
7204 | /* OK, we're just going to keep stepping here. */ | |
f2ffa92b | 7205 | if (stop_func_sal.pc == ecs->event_thread->suspend.stop_pc) |
b2175913 MS |
7206 | { |
7207 | /* We're there already. Just stop stepping now. */ | |
bdc36728 | 7208 | end_stepping_range (ecs); |
b2175913 MS |
7209 | } |
7210 | else | |
7211 | { | |
7212 | /* Else just reset the step range and keep going. | |
7213 | No step-resume breakpoint, they don't work for | |
7214 | epilogues, which can have multiple entry paths. */ | |
16c381f0 JK |
7215 | ecs->event_thread->control.step_range_start = stop_func_sal.pc; |
7216 | ecs->event_thread->control.step_range_end = stop_func_sal.end; | |
b2175913 MS |
7217 | keep_going (ecs); |
7218 | } | |
7219 | return; | |
7220 | } | |
7221 | ||
d3169d93 | 7222 | /* Insert a "step-resume breakpoint" at SR_SAL with frame ID SR_ID. |
44cbf7b5 AC |
7223 | This is used to both functions and to skip over code. */ |
7224 | ||
7225 | static void | |
2c03e5be PA |
7226 | insert_step_resume_breakpoint_at_sal_1 (struct gdbarch *gdbarch, |
7227 | struct symtab_and_line sr_sal, | |
7228 | struct frame_id sr_id, | |
7229 | enum bptype sr_type) | |
44cbf7b5 | 7230 | { |
611c83ae PA |
7231 | /* There should never be more than one step-resume or longjmp-resume |
7232 | breakpoint per thread, so we should never be setting a new | |
44cbf7b5 | 7233 | step_resume_breakpoint when one is already active. */ |
8358c15c | 7234 | gdb_assert (inferior_thread ()->control.step_resume_breakpoint == NULL); |
2c03e5be | 7235 | gdb_assert (sr_type == bp_step_resume || sr_type == bp_hp_step_resume); |
d3169d93 DJ |
7236 | |
7237 | if (debug_infrun) | |
7238 | fprintf_unfiltered (gdb_stdlog, | |
5af949e3 UW |
7239 | "infrun: inserting step-resume breakpoint at %s\n", |
7240 | paddress (gdbarch, sr_sal.pc)); | |
d3169d93 | 7241 | |
8358c15c | 7242 | inferior_thread ()->control.step_resume_breakpoint |
454dafbd | 7243 | = set_momentary_breakpoint (gdbarch, sr_sal, sr_id, sr_type).release (); |
2c03e5be PA |
7244 | } |
7245 | ||
9da8c2a0 | 7246 | void |
2c03e5be PA |
7247 | insert_step_resume_breakpoint_at_sal (struct gdbarch *gdbarch, |
7248 | struct symtab_and_line sr_sal, | |
7249 | struct frame_id sr_id) | |
7250 | { | |
7251 | insert_step_resume_breakpoint_at_sal_1 (gdbarch, | |
7252 | sr_sal, sr_id, | |
7253 | bp_step_resume); | |
44cbf7b5 | 7254 | } |
7ce450bd | 7255 | |
2c03e5be PA |
7256 | /* Insert a "high-priority step-resume breakpoint" at RETURN_FRAME.pc. |
7257 | This is used to skip a potential signal handler. | |
7ce450bd | 7258 | |
14e60db5 DJ |
7259 | This is called with the interrupted function's frame. The signal |
7260 | handler, when it returns, will resume the interrupted function at | |
7261 | RETURN_FRAME.pc. */ | |
d303a6c7 AC |
7262 | |
7263 | static void | |
2c03e5be | 7264 | insert_hp_step_resume_breakpoint_at_frame (struct frame_info *return_frame) |
d303a6c7 | 7265 | { |
f4c1edd8 | 7266 | gdb_assert (return_frame != NULL); |
d303a6c7 | 7267 | |
51abb421 PA |
7268 | struct gdbarch *gdbarch = get_frame_arch (return_frame); |
7269 | ||
7270 | symtab_and_line sr_sal; | |
568d6575 | 7271 | sr_sal.pc = gdbarch_addr_bits_remove (gdbarch, get_frame_pc (return_frame)); |
d303a6c7 | 7272 | sr_sal.section = find_pc_overlay (sr_sal.pc); |
6c95b8df | 7273 | sr_sal.pspace = get_frame_program_space (return_frame); |
d303a6c7 | 7274 | |
2c03e5be PA |
7275 | insert_step_resume_breakpoint_at_sal_1 (gdbarch, sr_sal, |
7276 | get_stack_frame_id (return_frame), | |
7277 | bp_hp_step_resume); | |
d303a6c7 AC |
7278 | } |
7279 | ||
2c03e5be PA |
7280 | /* Insert a "step-resume breakpoint" at the previous frame's PC. This |
7281 | is used to skip a function after stepping into it (for "next" or if | |
7282 | the called function has no debugging information). | |
14e60db5 DJ |
7283 | |
7284 | The current function has almost always been reached by single | |
7285 | stepping a call or return instruction. NEXT_FRAME belongs to the | |
7286 | current function, and the breakpoint will be set at the caller's | |
7287 | resume address. | |
7288 | ||
7289 | This is a separate function rather than reusing | |
2c03e5be | 7290 | insert_hp_step_resume_breakpoint_at_frame in order to avoid |
14e60db5 | 7291 | get_prev_frame, which may stop prematurely (see the implementation |
c7ce8faa | 7292 | of frame_unwind_caller_id for an example). */ |
14e60db5 DJ |
7293 | |
7294 | static void | |
7295 | insert_step_resume_breakpoint_at_caller (struct frame_info *next_frame) | |
7296 | { | |
14e60db5 DJ |
7297 | /* We shouldn't have gotten here if we don't know where the call site |
7298 | is. */ | |
c7ce8faa | 7299 | gdb_assert (frame_id_p (frame_unwind_caller_id (next_frame))); |
14e60db5 | 7300 | |
51abb421 | 7301 | struct gdbarch *gdbarch = frame_unwind_caller_arch (next_frame); |
14e60db5 | 7302 | |
51abb421 | 7303 | symtab_and_line sr_sal; |
c7ce8faa DJ |
7304 | sr_sal.pc = gdbarch_addr_bits_remove (gdbarch, |
7305 | frame_unwind_caller_pc (next_frame)); | |
14e60db5 | 7306 | sr_sal.section = find_pc_overlay (sr_sal.pc); |
6c95b8df | 7307 | sr_sal.pspace = frame_unwind_program_space (next_frame); |
14e60db5 | 7308 | |
a6d9a66e | 7309 | insert_step_resume_breakpoint_at_sal (gdbarch, sr_sal, |
c7ce8faa | 7310 | frame_unwind_caller_id (next_frame)); |
14e60db5 DJ |
7311 | } |
7312 | ||
611c83ae PA |
7313 | /* Insert a "longjmp-resume" breakpoint at PC. This is used to set a |
7314 | new breakpoint at the target of a jmp_buf. The handling of | |
7315 | longjmp-resume uses the same mechanisms used for handling | |
7316 | "step-resume" breakpoints. */ | |
7317 | ||
7318 | static void | |
a6d9a66e | 7319 | insert_longjmp_resume_breakpoint (struct gdbarch *gdbarch, CORE_ADDR pc) |
611c83ae | 7320 | { |
e81a37f7 TT |
7321 | /* There should never be more than one longjmp-resume breakpoint per |
7322 | thread, so we should never be setting a new | |
611c83ae | 7323 | longjmp_resume_breakpoint when one is already active. */ |
e81a37f7 | 7324 | gdb_assert (inferior_thread ()->control.exception_resume_breakpoint == NULL); |
611c83ae PA |
7325 | |
7326 | if (debug_infrun) | |
7327 | fprintf_unfiltered (gdb_stdlog, | |
5af949e3 UW |
7328 | "infrun: inserting longjmp-resume breakpoint at %s\n", |
7329 | paddress (gdbarch, pc)); | |
611c83ae | 7330 | |
e81a37f7 | 7331 | inferior_thread ()->control.exception_resume_breakpoint = |
454dafbd | 7332 | set_momentary_breakpoint_at_pc (gdbarch, pc, bp_longjmp_resume).release (); |
611c83ae PA |
7333 | } |
7334 | ||
186c406b TT |
7335 | /* Insert an exception resume breakpoint. TP is the thread throwing |
7336 | the exception. The block B is the block of the unwinder debug hook | |
7337 | function. FRAME is the frame corresponding to the call to this | |
7338 | function. SYM is the symbol of the function argument holding the | |
7339 | target PC of the exception. */ | |
7340 | ||
7341 | static void | |
7342 | insert_exception_resume_breakpoint (struct thread_info *tp, | |
3977b71f | 7343 | const struct block *b, |
186c406b TT |
7344 | struct frame_info *frame, |
7345 | struct symbol *sym) | |
7346 | { | |
492d29ea | 7347 | TRY |
186c406b | 7348 | { |
63e43d3a | 7349 | struct block_symbol vsym; |
186c406b TT |
7350 | struct value *value; |
7351 | CORE_ADDR handler; | |
7352 | struct breakpoint *bp; | |
7353 | ||
de63c46b PA |
7354 | vsym = lookup_symbol_search_name (SYMBOL_SEARCH_NAME (sym), |
7355 | b, VAR_DOMAIN); | |
63e43d3a | 7356 | value = read_var_value (vsym.symbol, vsym.block, frame); |
186c406b TT |
7357 | /* If the value was optimized out, revert to the old behavior. */ |
7358 | if (! value_optimized_out (value)) | |
7359 | { | |
7360 | handler = value_as_address (value); | |
7361 | ||
7362 | if (debug_infrun) | |
7363 | fprintf_unfiltered (gdb_stdlog, | |
7364 | "infrun: exception resume at %lx\n", | |
7365 | (unsigned long) handler); | |
7366 | ||
7367 | bp = set_momentary_breakpoint_at_pc (get_frame_arch (frame), | |
454dafbd TT |
7368 | handler, |
7369 | bp_exception_resume).release (); | |
c70a6932 JK |
7370 | |
7371 | /* set_momentary_breakpoint_at_pc invalidates FRAME. */ | |
7372 | frame = NULL; | |
7373 | ||
5d5658a1 | 7374 | bp->thread = tp->global_num; |
186c406b TT |
7375 | inferior_thread ()->control.exception_resume_breakpoint = bp; |
7376 | } | |
7377 | } | |
492d29ea PA |
7378 | CATCH (e, RETURN_MASK_ERROR) |
7379 | { | |
7380 | /* We want to ignore errors here. */ | |
7381 | } | |
7382 | END_CATCH | |
186c406b TT |
7383 | } |
7384 | ||
28106bc2 SDJ |
7385 | /* A helper for check_exception_resume that sets an |
7386 | exception-breakpoint based on a SystemTap probe. */ | |
7387 | ||
7388 | static void | |
7389 | insert_exception_resume_from_probe (struct thread_info *tp, | |
729662a5 | 7390 | const struct bound_probe *probe, |
28106bc2 SDJ |
7391 | struct frame_info *frame) |
7392 | { | |
7393 | struct value *arg_value; | |
7394 | CORE_ADDR handler; | |
7395 | struct breakpoint *bp; | |
7396 | ||
7397 | arg_value = probe_safe_evaluate_at_pc (frame, 1); | |
7398 | if (!arg_value) | |
7399 | return; | |
7400 | ||
7401 | handler = value_as_address (arg_value); | |
7402 | ||
7403 | if (debug_infrun) | |
7404 | fprintf_unfiltered (gdb_stdlog, | |
7405 | "infrun: exception resume at %s\n", | |
6bac7473 | 7406 | paddress (get_objfile_arch (probe->objfile), |
28106bc2 SDJ |
7407 | handler)); |
7408 | ||
7409 | bp = set_momentary_breakpoint_at_pc (get_frame_arch (frame), | |
454dafbd | 7410 | handler, bp_exception_resume).release (); |
5d5658a1 | 7411 | bp->thread = tp->global_num; |
28106bc2 SDJ |
7412 | inferior_thread ()->control.exception_resume_breakpoint = bp; |
7413 | } | |
7414 | ||
186c406b TT |
7415 | /* This is called when an exception has been intercepted. Check to |
7416 | see whether the exception's destination is of interest, and if so, | |
7417 | set an exception resume breakpoint there. */ | |
7418 | ||
7419 | static void | |
7420 | check_exception_resume (struct execution_control_state *ecs, | |
28106bc2 | 7421 | struct frame_info *frame) |
186c406b | 7422 | { |
729662a5 | 7423 | struct bound_probe probe; |
28106bc2 SDJ |
7424 | struct symbol *func; |
7425 | ||
7426 | /* First see if this exception unwinding breakpoint was set via a | |
7427 | SystemTap probe point. If so, the probe has two arguments: the | |
7428 | CFA and the HANDLER. We ignore the CFA, extract the handler, and | |
7429 | set a breakpoint there. */ | |
6bac7473 | 7430 | probe = find_probe_by_pc (get_frame_pc (frame)); |
935676c9 | 7431 | if (probe.prob) |
28106bc2 | 7432 | { |
729662a5 | 7433 | insert_exception_resume_from_probe (ecs->event_thread, &probe, frame); |
28106bc2 SDJ |
7434 | return; |
7435 | } | |
7436 | ||
7437 | func = get_frame_function (frame); | |
7438 | if (!func) | |
7439 | return; | |
186c406b | 7440 | |
492d29ea | 7441 | TRY |
186c406b | 7442 | { |
3977b71f | 7443 | const struct block *b; |
8157b174 | 7444 | struct block_iterator iter; |
186c406b TT |
7445 | struct symbol *sym; |
7446 | int argno = 0; | |
7447 | ||
7448 | /* The exception breakpoint is a thread-specific breakpoint on | |
7449 | the unwinder's debug hook, declared as: | |
7450 | ||
7451 | void _Unwind_DebugHook (void *cfa, void *handler); | |
7452 | ||
7453 | The CFA argument indicates the frame to which control is | |
7454 | about to be transferred. HANDLER is the destination PC. | |
7455 | ||
7456 | We ignore the CFA and set a temporary breakpoint at HANDLER. | |
7457 | This is not extremely efficient but it avoids issues in gdb | |
7458 | with computing the DWARF CFA, and it also works even in weird | |
7459 | cases such as throwing an exception from inside a signal | |
7460 | handler. */ | |
7461 | ||
7462 | b = SYMBOL_BLOCK_VALUE (func); | |
7463 | ALL_BLOCK_SYMBOLS (b, iter, sym) | |
7464 | { | |
7465 | if (!SYMBOL_IS_ARGUMENT (sym)) | |
7466 | continue; | |
7467 | ||
7468 | if (argno == 0) | |
7469 | ++argno; | |
7470 | else | |
7471 | { | |
7472 | insert_exception_resume_breakpoint (ecs->event_thread, | |
7473 | b, frame, sym); | |
7474 | break; | |
7475 | } | |
7476 | } | |
7477 | } | |
492d29ea PA |
7478 | CATCH (e, RETURN_MASK_ERROR) |
7479 | { | |
7480 | } | |
7481 | END_CATCH | |
186c406b TT |
7482 | } |
7483 | ||
104c1213 | 7484 | static void |
22bcd14b | 7485 | stop_waiting (struct execution_control_state *ecs) |
104c1213 | 7486 | { |
527159b7 | 7487 | if (debug_infrun) |
22bcd14b | 7488 | fprintf_unfiltered (gdb_stdlog, "infrun: stop_waiting\n"); |
527159b7 | 7489 | |
cd0fc7c3 SS |
7490 | /* Let callers know we don't want to wait for the inferior anymore. */ |
7491 | ecs->wait_some_more = 0; | |
fbea99ea PA |
7492 | |
7493 | /* If all-stop, but the target is always in non-stop mode, stop all | |
7494 | threads now that we're presenting the stop to the user. */ | |
7495 | if (!non_stop && target_is_non_stop_p ()) | |
7496 | stop_all_threads (); | |
cd0fc7c3 SS |
7497 | } |
7498 | ||
4d9d9d04 PA |
7499 | /* Like keep_going, but passes the signal to the inferior, even if the |
7500 | signal is set to nopass. */ | |
d4f3574e SS |
7501 | |
7502 | static void | |
4d9d9d04 | 7503 | keep_going_pass_signal (struct execution_control_state *ecs) |
d4f3574e | 7504 | { |
d7e15655 | 7505 | gdb_assert (ecs->event_thread->ptid == inferior_ptid); |
372316f1 | 7506 | gdb_assert (!ecs->event_thread->resumed); |
4d9d9d04 | 7507 | |
d4f3574e | 7508 | /* Save the pc before execution, to compare with pc after stop. */ |
fb14de7b | 7509 | ecs->event_thread->prev_pc |
00431a78 | 7510 | = regcache_read_pc (get_thread_regcache (ecs->event_thread)); |
d4f3574e | 7511 | |
4d9d9d04 | 7512 | if (ecs->event_thread->control.trap_expected) |
d4f3574e | 7513 | { |
4d9d9d04 PA |
7514 | struct thread_info *tp = ecs->event_thread; |
7515 | ||
7516 | if (debug_infrun) | |
7517 | fprintf_unfiltered (gdb_stdlog, | |
7518 | "infrun: %s has trap_expected set, " | |
7519 | "resuming to collect trap\n", | |
7520 | target_pid_to_str (tp->ptid)); | |
7521 | ||
a9ba6bae PA |
7522 | /* We haven't yet gotten our trap, and either: intercepted a |
7523 | non-signal event (e.g., a fork); or took a signal which we | |
7524 | are supposed to pass through to the inferior. Simply | |
7525 | continue. */ | |
64ce06e4 | 7526 | resume (ecs->event_thread->suspend.stop_signal); |
d4f3574e | 7527 | } |
372316f1 PA |
7528 | else if (step_over_info_valid_p ()) |
7529 | { | |
7530 | /* Another thread is stepping over a breakpoint in-line. If | |
7531 | this thread needs a step-over too, queue the request. In | |
7532 | either case, this resume must be deferred for later. */ | |
7533 | struct thread_info *tp = ecs->event_thread; | |
7534 | ||
7535 | if (ecs->hit_singlestep_breakpoint | |
7536 | || thread_still_needs_step_over (tp)) | |
7537 | { | |
7538 | if (debug_infrun) | |
7539 | fprintf_unfiltered (gdb_stdlog, | |
7540 | "infrun: step-over already in progress: " | |
7541 | "step-over for %s deferred\n", | |
7542 | target_pid_to_str (tp->ptid)); | |
7543 | thread_step_over_chain_enqueue (tp); | |
7544 | } | |
7545 | else | |
7546 | { | |
7547 | if (debug_infrun) | |
7548 | fprintf_unfiltered (gdb_stdlog, | |
7549 | "infrun: step-over in progress: " | |
7550 | "resume of %s deferred\n", | |
7551 | target_pid_to_str (tp->ptid)); | |
7552 | } | |
372316f1 | 7553 | } |
d4f3574e SS |
7554 | else |
7555 | { | |
31e77af2 | 7556 | struct regcache *regcache = get_current_regcache (); |
963f9c80 PA |
7557 | int remove_bp; |
7558 | int remove_wps; | |
8d297bbf | 7559 | step_over_what step_what; |
31e77af2 | 7560 | |
d4f3574e | 7561 | /* Either the trap was not expected, but we are continuing |
a9ba6bae PA |
7562 | anyway (if we got a signal, the user asked it be passed to |
7563 | the child) | |
7564 | -- or -- | |
7565 | We got our expected trap, but decided we should resume from | |
7566 | it. | |
d4f3574e | 7567 | |
a9ba6bae | 7568 | We're going to run this baby now! |
d4f3574e | 7569 | |
c36b740a VP |
7570 | Note that insert_breakpoints won't try to re-insert |
7571 | already inserted breakpoints. Therefore, we don't | |
7572 | care if breakpoints were already inserted, or not. */ | |
a9ba6bae | 7573 | |
31e77af2 PA |
7574 | /* If we need to step over a breakpoint, and we're not using |
7575 | displaced stepping to do so, insert all breakpoints | |
7576 | (watchpoints, etc.) but the one we're stepping over, step one | |
7577 | instruction, and then re-insert the breakpoint when that step | |
7578 | is finished. */ | |
963f9c80 | 7579 | |
6c4cfb24 PA |
7580 | step_what = thread_still_needs_step_over (ecs->event_thread); |
7581 | ||
963f9c80 | 7582 | remove_bp = (ecs->hit_singlestep_breakpoint |
6c4cfb24 PA |
7583 | || (step_what & STEP_OVER_BREAKPOINT)); |
7584 | remove_wps = (step_what & STEP_OVER_WATCHPOINT); | |
963f9c80 | 7585 | |
cb71640d PA |
7586 | /* We can't use displaced stepping if we need to step past a |
7587 | watchpoint. The instruction copied to the scratch pad would | |
7588 | still trigger the watchpoint. */ | |
7589 | if (remove_bp | |
3fc8eb30 | 7590 | && (remove_wps || !use_displaced_stepping (ecs->event_thread))) |
45e8c884 | 7591 | { |
a01bda52 | 7592 | set_step_over_info (regcache->aspace (), |
21edc42f YQ |
7593 | regcache_read_pc (regcache), remove_wps, |
7594 | ecs->event_thread->global_num); | |
45e8c884 | 7595 | } |
963f9c80 | 7596 | else if (remove_wps) |
21edc42f | 7597 | set_step_over_info (NULL, 0, remove_wps, -1); |
372316f1 PA |
7598 | |
7599 | /* If we now need to do an in-line step-over, we need to stop | |
7600 | all other threads. Note this must be done before | |
7601 | insert_breakpoints below, because that removes the breakpoint | |
7602 | we're about to step over, otherwise other threads could miss | |
7603 | it. */ | |
fbea99ea | 7604 | if (step_over_info_valid_p () && target_is_non_stop_p ()) |
372316f1 | 7605 | stop_all_threads (); |
abbb1732 | 7606 | |
31e77af2 | 7607 | /* Stop stepping if inserting breakpoints fails. */ |
492d29ea | 7608 | TRY |
31e77af2 PA |
7609 | { |
7610 | insert_breakpoints (); | |
7611 | } | |
492d29ea | 7612 | CATCH (e, RETURN_MASK_ERROR) |
31e77af2 PA |
7613 | { |
7614 | exception_print (gdb_stderr, e); | |
22bcd14b | 7615 | stop_waiting (ecs); |
bdf2a94a | 7616 | clear_step_over_info (); |
31e77af2 | 7617 | return; |
d4f3574e | 7618 | } |
492d29ea | 7619 | END_CATCH |
d4f3574e | 7620 | |
963f9c80 | 7621 | ecs->event_thread->control.trap_expected = (remove_bp || remove_wps); |
d4f3574e | 7622 | |
64ce06e4 | 7623 | resume (ecs->event_thread->suspend.stop_signal); |
d4f3574e SS |
7624 | } |
7625 | ||
488f131b | 7626 | prepare_to_wait (ecs); |
d4f3574e SS |
7627 | } |
7628 | ||
4d9d9d04 PA |
7629 | /* Called when we should continue running the inferior, because the |
7630 | current event doesn't cause a user visible stop. This does the | |
7631 | resuming part; waiting for the next event is done elsewhere. */ | |
7632 | ||
7633 | static void | |
7634 | keep_going (struct execution_control_state *ecs) | |
7635 | { | |
7636 | if (ecs->event_thread->control.trap_expected | |
7637 | && ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP) | |
7638 | ecs->event_thread->control.trap_expected = 0; | |
7639 | ||
7640 | if (!signal_program[ecs->event_thread->suspend.stop_signal]) | |
7641 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; | |
7642 | keep_going_pass_signal (ecs); | |
7643 | } | |
7644 | ||
104c1213 JM |
7645 | /* This function normally comes after a resume, before |
7646 | handle_inferior_event exits. It takes care of any last bits of | |
7647 | housekeeping, and sets the all-important wait_some_more flag. */ | |
cd0fc7c3 | 7648 | |
104c1213 JM |
7649 | static void |
7650 | prepare_to_wait (struct execution_control_state *ecs) | |
cd0fc7c3 | 7651 | { |
527159b7 | 7652 | if (debug_infrun) |
8a9de0e4 | 7653 | fprintf_unfiltered (gdb_stdlog, "infrun: prepare_to_wait\n"); |
104c1213 | 7654 | |
104c1213 | 7655 | ecs->wait_some_more = 1; |
0b333c5e PA |
7656 | |
7657 | if (!target_is_async_p ()) | |
7658 | mark_infrun_async_event_handler (); | |
c906108c | 7659 | } |
11cf8741 | 7660 | |
fd664c91 | 7661 | /* We are done with the step range of a step/next/si/ni command. |
b57bacec | 7662 | Called once for each n of a "step n" operation. */ |
fd664c91 PA |
7663 | |
7664 | static void | |
bdc36728 | 7665 | end_stepping_range (struct execution_control_state *ecs) |
fd664c91 | 7666 | { |
bdc36728 | 7667 | ecs->event_thread->control.stop_step = 1; |
bdc36728 | 7668 | stop_waiting (ecs); |
fd664c91 PA |
7669 | } |
7670 | ||
33d62d64 JK |
7671 | /* Several print_*_reason functions to print why the inferior has stopped. |
7672 | We always print something when the inferior exits, or receives a signal. | |
7673 | The rest of the cases are dealt with later on in normal_stop and | |
7674 | print_it_typical. Ideally there should be a call to one of these | |
7675 | print_*_reason functions functions from handle_inferior_event each time | |
22bcd14b | 7676 | stop_waiting is called. |
33d62d64 | 7677 | |
fd664c91 PA |
7678 | Note that we don't call these directly, instead we delegate that to |
7679 | the interpreters, through observers. Interpreters then call these | |
7680 | with whatever uiout is right. */ | |
33d62d64 | 7681 | |
fd664c91 PA |
7682 | void |
7683 | print_end_stepping_range_reason (struct ui_out *uiout) | |
33d62d64 | 7684 | { |
fd664c91 | 7685 | /* For CLI-like interpreters, print nothing. */ |
33d62d64 | 7686 | |
112e8700 | 7687 | if (uiout->is_mi_like_p ()) |
fd664c91 | 7688 | { |
112e8700 | 7689 | uiout->field_string ("reason", |
fd664c91 PA |
7690 | async_reason_lookup (EXEC_ASYNC_END_STEPPING_RANGE)); |
7691 | } | |
7692 | } | |
33d62d64 | 7693 | |
fd664c91 PA |
7694 | void |
7695 | print_signal_exited_reason (struct ui_out *uiout, enum gdb_signal siggnal) | |
11cf8741 | 7696 | { |
33d62d64 | 7697 | annotate_signalled (); |
112e8700 SM |
7698 | if (uiout->is_mi_like_p ()) |
7699 | uiout->field_string | |
7700 | ("reason", async_reason_lookup (EXEC_ASYNC_EXITED_SIGNALLED)); | |
7701 | uiout->text ("\nProgram terminated with signal "); | |
33d62d64 | 7702 | annotate_signal_name (); |
112e8700 | 7703 | uiout->field_string ("signal-name", |
2ea28649 | 7704 | gdb_signal_to_name (siggnal)); |
33d62d64 | 7705 | annotate_signal_name_end (); |
112e8700 | 7706 | uiout->text (", "); |
33d62d64 | 7707 | annotate_signal_string (); |
112e8700 | 7708 | uiout->field_string ("signal-meaning", |
2ea28649 | 7709 | gdb_signal_to_string (siggnal)); |
33d62d64 | 7710 | annotate_signal_string_end (); |
112e8700 SM |
7711 | uiout->text (".\n"); |
7712 | uiout->text ("The program no longer exists.\n"); | |
33d62d64 JK |
7713 | } |
7714 | ||
fd664c91 PA |
7715 | void |
7716 | print_exited_reason (struct ui_out *uiout, int exitstatus) | |
33d62d64 | 7717 | { |
fda326dd | 7718 | struct inferior *inf = current_inferior (); |
f2907e49 | 7719 | const char *pidstr = target_pid_to_str (ptid_t (inf->pid)); |
fda326dd | 7720 | |
33d62d64 JK |
7721 | annotate_exited (exitstatus); |
7722 | if (exitstatus) | |
7723 | { | |
112e8700 SM |
7724 | if (uiout->is_mi_like_p ()) |
7725 | uiout->field_string ("reason", async_reason_lookup (EXEC_ASYNC_EXITED)); | |
7726 | uiout->text ("[Inferior "); | |
7727 | uiout->text (plongest (inf->num)); | |
7728 | uiout->text (" ("); | |
7729 | uiout->text (pidstr); | |
7730 | uiout->text (") exited with code "); | |
7731 | uiout->field_fmt ("exit-code", "0%o", (unsigned int) exitstatus); | |
7732 | uiout->text ("]\n"); | |
33d62d64 JK |
7733 | } |
7734 | else | |
11cf8741 | 7735 | { |
112e8700 SM |
7736 | if (uiout->is_mi_like_p ()) |
7737 | uiout->field_string | |
7738 | ("reason", async_reason_lookup (EXEC_ASYNC_EXITED_NORMALLY)); | |
7739 | uiout->text ("[Inferior "); | |
7740 | uiout->text (plongest (inf->num)); | |
7741 | uiout->text (" ("); | |
7742 | uiout->text (pidstr); | |
7743 | uiout->text (") exited normally]\n"); | |
33d62d64 | 7744 | } |
33d62d64 JK |
7745 | } |
7746 | ||
012b3a21 WT |
7747 | /* Some targets/architectures can do extra processing/display of |
7748 | segmentation faults. E.g., Intel MPX boundary faults. | |
7749 | Call the architecture dependent function to handle the fault. */ | |
7750 | ||
7751 | static void | |
7752 | handle_segmentation_fault (struct ui_out *uiout) | |
7753 | { | |
7754 | struct regcache *regcache = get_current_regcache (); | |
ac7936df | 7755 | struct gdbarch *gdbarch = regcache->arch (); |
012b3a21 WT |
7756 | |
7757 | if (gdbarch_handle_segmentation_fault_p (gdbarch)) | |
7758 | gdbarch_handle_segmentation_fault (gdbarch, uiout); | |
7759 | } | |
7760 | ||
fd664c91 PA |
7761 | void |
7762 | print_signal_received_reason (struct ui_out *uiout, enum gdb_signal siggnal) | |
33d62d64 | 7763 | { |
f303dbd6 PA |
7764 | struct thread_info *thr = inferior_thread (); |
7765 | ||
33d62d64 JK |
7766 | annotate_signal (); |
7767 | ||
112e8700 | 7768 | if (uiout->is_mi_like_p ()) |
f303dbd6 PA |
7769 | ; |
7770 | else if (show_thread_that_caused_stop ()) | |
33d62d64 | 7771 | { |
f303dbd6 | 7772 | const char *name; |
33d62d64 | 7773 | |
112e8700 SM |
7774 | uiout->text ("\nThread "); |
7775 | uiout->field_fmt ("thread-id", "%s", print_thread_id (thr)); | |
f303dbd6 PA |
7776 | |
7777 | name = thr->name != NULL ? thr->name : target_thread_name (thr); | |
7778 | if (name != NULL) | |
7779 | { | |
112e8700 SM |
7780 | uiout->text (" \""); |
7781 | uiout->field_fmt ("name", "%s", name); | |
7782 | uiout->text ("\""); | |
f303dbd6 | 7783 | } |
33d62d64 | 7784 | } |
f303dbd6 | 7785 | else |
112e8700 | 7786 | uiout->text ("\nProgram"); |
f303dbd6 | 7787 | |
112e8700 SM |
7788 | if (siggnal == GDB_SIGNAL_0 && !uiout->is_mi_like_p ()) |
7789 | uiout->text (" stopped"); | |
33d62d64 JK |
7790 | else |
7791 | { | |
112e8700 | 7792 | uiout->text (" received signal "); |
8b93c638 | 7793 | annotate_signal_name (); |
112e8700 SM |
7794 | if (uiout->is_mi_like_p ()) |
7795 | uiout->field_string | |
7796 | ("reason", async_reason_lookup (EXEC_ASYNC_SIGNAL_RECEIVED)); | |
7797 | uiout->field_string ("signal-name", gdb_signal_to_name (siggnal)); | |
8b93c638 | 7798 | annotate_signal_name_end (); |
112e8700 | 7799 | uiout->text (", "); |
8b93c638 | 7800 | annotate_signal_string (); |
112e8700 | 7801 | uiout->field_string ("signal-meaning", gdb_signal_to_string (siggnal)); |
012b3a21 WT |
7802 | |
7803 | if (siggnal == GDB_SIGNAL_SEGV) | |
7804 | handle_segmentation_fault (uiout); | |
7805 | ||
8b93c638 | 7806 | annotate_signal_string_end (); |
33d62d64 | 7807 | } |
112e8700 | 7808 | uiout->text (".\n"); |
33d62d64 | 7809 | } |
252fbfc8 | 7810 | |
fd664c91 PA |
7811 | void |
7812 | print_no_history_reason (struct ui_out *uiout) | |
33d62d64 | 7813 | { |
112e8700 | 7814 | uiout->text ("\nNo more reverse-execution history.\n"); |
11cf8741 | 7815 | } |
43ff13b4 | 7816 | |
0c7e1a46 PA |
7817 | /* Print current location without a level number, if we have changed |
7818 | functions or hit a breakpoint. Print source line if we have one. | |
7819 | bpstat_print contains the logic deciding in detail what to print, | |
7820 | based on the event(s) that just occurred. */ | |
7821 | ||
243a9253 PA |
7822 | static void |
7823 | print_stop_location (struct target_waitstatus *ws) | |
0c7e1a46 PA |
7824 | { |
7825 | int bpstat_ret; | |
f486487f | 7826 | enum print_what source_flag; |
0c7e1a46 PA |
7827 | int do_frame_printing = 1; |
7828 | struct thread_info *tp = inferior_thread (); | |
7829 | ||
7830 | bpstat_ret = bpstat_print (tp->control.stop_bpstat, ws->kind); | |
7831 | switch (bpstat_ret) | |
7832 | { | |
7833 | case PRINT_UNKNOWN: | |
7834 | /* FIXME: cagney/2002-12-01: Given that a frame ID does (or | |
7835 | should) carry around the function and does (or should) use | |
7836 | that when doing a frame comparison. */ | |
7837 | if (tp->control.stop_step | |
7838 | && frame_id_eq (tp->control.step_frame_id, | |
7839 | get_frame_id (get_current_frame ())) | |
f2ffa92b PA |
7840 | && (tp->control.step_start_function |
7841 | == find_pc_function (tp->suspend.stop_pc))) | |
0c7e1a46 PA |
7842 | { |
7843 | /* Finished step, just print source line. */ | |
7844 | source_flag = SRC_LINE; | |
7845 | } | |
7846 | else | |
7847 | { | |
7848 | /* Print location and source line. */ | |
7849 | source_flag = SRC_AND_LOC; | |
7850 | } | |
7851 | break; | |
7852 | case PRINT_SRC_AND_LOC: | |
7853 | /* Print location and source line. */ | |
7854 | source_flag = SRC_AND_LOC; | |
7855 | break; | |
7856 | case PRINT_SRC_ONLY: | |
7857 | source_flag = SRC_LINE; | |
7858 | break; | |
7859 | case PRINT_NOTHING: | |
7860 | /* Something bogus. */ | |
7861 | source_flag = SRC_LINE; | |
7862 | do_frame_printing = 0; | |
7863 | break; | |
7864 | default: | |
7865 | internal_error (__FILE__, __LINE__, _("Unknown value.")); | |
7866 | } | |
7867 | ||
7868 | /* The behavior of this routine with respect to the source | |
7869 | flag is: | |
7870 | SRC_LINE: Print only source line | |
7871 | LOCATION: Print only location | |
7872 | SRC_AND_LOC: Print location and source line. */ | |
7873 | if (do_frame_printing) | |
7874 | print_stack_frame (get_selected_frame (NULL), 0, source_flag, 1); | |
243a9253 PA |
7875 | } |
7876 | ||
243a9253 PA |
7877 | /* See infrun.h. */ |
7878 | ||
7879 | void | |
7880 | print_stop_event (struct ui_out *uiout) | |
7881 | { | |
243a9253 PA |
7882 | struct target_waitstatus last; |
7883 | ptid_t last_ptid; | |
7884 | struct thread_info *tp; | |
7885 | ||
7886 | get_last_target_status (&last_ptid, &last); | |
7887 | ||
67ad9399 TT |
7888 | { |
7889 | scoped_restore save_uiout = make_scoped_restore (¤t_uiout, uiout); | |
0c7e1a46 | 7890 | |
67ad9399 | 7891 | print_stop_location (&last); |
243a9253 | 7892 | |
67ad9399 TT |
7893 | /* Display the auto-display expressions. */ |
7894 | do_displays (); | |
7895 | } | |
243a9253 PA |
7896 | |
7897 | tp = inferior_thread (); | |
7898 | if (tp->thread_fsm != NULL | |
7899 | && thread_fsm_finished_p (tp->thread_fsm)) | |
7900 | { | |
7901 | struct return_value_info *rv; | |
7902 | ||
7903 | rv = thread_fsm_return_value (tp->thread_fsm); | |
7904 | if (rv != NULL) | |
7905 | print_return_value (uiout, rv); | |
7906 | } | |
0c7e1a46 PA |
7907 | } |
7908 | ||
388a7084 PA |
7909 | /* See infrun.h. */ |
7910 | ||
7911 | void | |
7912 | maybe_remove_breakpoints (void) | |
7913 | { | |
7914 | if (!breakpoints_should_be_inserted_now () && target_has_execution) | |
7915 | { | |
7916 | if (remove_breakpoints ()) | |
7917 | { | |
223ffa71 | 7918 | target_terminal::ours_for_output (); |
388a7084 PA |
7919 | printf_filtered (_("Cannot remove breakpoints because " |
7920 | "program is no longer writable.\nFurther " | |
7921 | "execution is probably impossible.\n")); | |
7922 | } | |
7923 | } | |
7924 | } | |
7925 | ||
4c2f2a79 PA |
7926 | /* The execution context that just caused a normal stop. */ |
7927 | ||
7928 | struct stop_context | |
7929 | { | |
2d844eaf TT |
7930 | stop_context (); |
7931 | ~stop_context (); | |
7932 | ||
7933 | DISABLE_COPY_AND_ASSIGN (stop_context); | |
7934 | ||
7935 | bool changed () const; | |
7936 | ||
4c2f2a79 PA |
7937 | /* The stop ID. */ |
7938 | ULONGEST stop_id; | |
c906108c | 7939 | |
4c2f2a79 | 7940 | /* The event PTID. */ |
c906108c | 7941 | |
4c2f2a79 PA |
7942 | ptid_t ptid; |
7943 | ||
7944 | /* If stopp for a thread event, this is the thread that caused the | |
7945 | stop. */ | |
7946 | struct thread_info *thread; | |
7947 | ||
7948 | /* The inferior that caused the stop. */ | |
7949 | int inf_num; | |
7950 | }; | |
7951 | ||
2d844eaf | 7952 | /* Initializes a new stop context. If stopped for a thread event, this |
4c2f2a79 PA |
7953 | takes a strong reference to the thread. */ |
7954 | ||
2d844eaf | 7955 | stop_context::stop_context () |
4c2f2a79 | 7956 | { |
2d844eaf TT |
7957 | stop_id = get_stop_id (); |
7958 | ptid = inferior_ptid; | |
7959 | inf_num = current_inferior ()->num; | |
4c2f2a79 | 7960 | |
d7e15655 | 7961 | if (inferior_ptid != null_ptid) |
4c2f2a79 PA |
7962 | { |
7963 | /* Take a strong reference so that the thread can't be deleted | |
7964 | yet. */ | |
2d844eaf TT |
7965 | thread = inferior_thread (); |
7966 | thread->incref (); | |
4c2f2a79 PA |
7967 | } |
7968 | else | |
2d844eaf | 7969 | thread = NULL; |
4c2f2a79 PA |
7970 | } |
7971 | ||
7972 | /* Release a stop context previously created with save_stop_context. | |
7973 | Releases the strong reference to the thread as well. */ | |
7974 | ||
2d844eaf | 7975 | stop_context::~stop_context () |
4c2f2a79 | 7976 | { |
2d844eaf TT |
7977 | if (thread != NULL) |
7978 | thread->decref (); | |
4c2f2a79 PA |
7979 | } |
7980 | ||
7981 | /* Return true if the current context no longer matches the saved stop | |
7982 | context. */ | |
7983 | ||
2d844eaf TT |
7984 | bool |
7985 | stop_context::changed () const | |
7986 | { | |
7987 | if (ptid != inferior_ptid) | |
7988 | return true; | |
7989 | if (inf_num != current_inferior ()->num) | |
7990 | return true; | |
7991 | if (thread != NULL && thread->state != THREAD_STOPPED) | |
7992 | return true; | |
7993 | if (get_stop_id () != stop_id) | |
7994 | return true; | |
7995 | return false; | |
4c2f2a79 PA |
7996 | } |
7997 | ||
7998 | /* See infrun.h. */ | |
7999 | ||
8000 | int | |
96baa820 | 8001 | normal_stop (void) |
c906108c | 8002 | { |
73b65bb0 DJ |
8003 | struct target_waitstatus last; |
8004 | ptid_t last_ptid; | |
8005 | ||
8006 | get_last_target_status (&last_ptid, &last); | |
8007 | ||
4c2f2a79 PA |
8008 | new_stop_id (); |
8009 | ||
29f49a6a PA |
8010 | /* If an exception is thrown from this point on, make sure to |
8011 | propagate GDB's knowledge of the executing state to the | |
8012 | frontend/user running state. A QUIT is an easy exception to see | |
8013 | here, so do this before any filtered output. */ | |
731f534f PA |
8014 | |
8015 | gdb::optional<scoped_finish_thread_state> maybe_finish_thread_state; | |
8016 | ||
c35b1492 | 8017 | if (!non_stop) |
731f534f | 8018 | maybe_finish_thread_state.emplace (minus_one_ptid); |
e1316e60 PA |
8019 | else if (last.kind == TARGET_WAITKIND_SIGNALLED |
8020 | || last.kind == TARGET_WAITKIND_EXITED) | |
8021 | { | |
8022 | /* On some targets, we may still have live threads in the | |
8023 | inferior when we get a process exit event. E.g., for | |
8024 | "checkpoint", when the current checkpoint/fork exits, | |
8025 | linux-fork.c automatically switches to another fork from | |
8026 | within target_mourn_inferior. */ | |
731f534f PA |
8027 | if (inferior_ptid != null_ptid) |
8028 | maybe_finish_thread_state.emplace (ptid_t (inferior_ptid.pid ())); | |
e1316e60 PA |
8029 | } |
8030 | else if (last.kind != TARGET_WAITKIND_NO_RESUMED) | |
731f534f | 8031 | maybe_finish_thread_state.emplace (inferior_ptid); |
29f49a6a | 8032 | |
b57bacec PA |
8033 | /* As we're presenting a stop, and potentially removing breakpoints, |
8034 | update the thread list so we can tell whether there are threads | |
8035 | running on the target. With target remote, for example, we can | |
8036 | only learn about new threads when we explicitly update the thread | |
8037 | list. Do this before notifying the interpreters about signal | |
8038 | stops, end of stepping ranges, etc., so that the "new thread" | |
8039 | output is emitted before e.g., "Program received signal FOO", | |
8040 | instead of after. */ | |
8041 | update_thread_list (); | |
8042 | ||
8043 | if (last.kind == TARGET_WAITKIND_STOPPED && stopped_by_random_signal) | |
76727919 | 8044 | gdb::observers::signal_received.notify (inferior_thread ()->suspend.stop_signal); |
b57bacec | 8045 | |
c906108c SS |
8046 | /* As with the notification of thread events, we want to delay |
8047 | notifying the user that we've switched thread context until | |
8048 | the inferior actually stops. | |
8049 | ||
73b65bb0 DJ |
8050 | There's no point in saying anything if the inferior has exited. |
8051 | Note that SIGNALLED here means "exited with a signal", not | |
b65dc60b PA |
8052 | "received a signal". |
8053 | ||
8054 | Also skip saying anything in non-stop mode. In that mode, as we | |
8055 | don't want GDB to switch threads behind the user's back, to avoid | |
8056 | races where the user is typing a command to apply to thread x, | |
8057 | but GDB switches to thread y before the user finishes entering | |
8058 | the command, fetch_inferior_event installs a cleanup to restore | |
8059 | the current thread back to the thread the user had selected right | |
8060 | after this event is handled, so we're not really switching, only | |
8061 | informing of a stop. */ | |
4f8d22e3 | 8062 | if (!non_stop |
731f534f | 8063 | && previous_inferior_ptid != inferior_ptid |
73b65bb0 DJ |
8064 | && target_has_execution |
8065 | && last.kind != TARGET_WAITKIND_SIGNALLED | |
0e5bf2a8 PA |
8066 | && last.kind != TARGET_WAITKIND_EXITED |
8067 | && last.kind != TARGET_WAITKIND_NO_RESUMED) | |
c906108c | 8068 | { |
0e454242 | 8069 | SWITCH_THRU_ALL_UIS () |
3b12939d | 8070 | { |
223ffa71 | 8071 | target_terminal::ours_for_output (); |
3b12939d PA |
8072 | printf_filtered (_("[Switching to %s]\n"), |
8073 | target_pid_to_str (inferior_ptid)); | |
8074 | annotate_thread_changed (); | |
8075 | } | |
39f77062 | 8076 | previous_inferior_ptid = inferior_ptid; |
c906108c | 8077 | } |
c906108c | 8078 | |
0e5bf2a8 PA |
8079 | if (last.kind == TARGET_WAITKIND_NO_RESUMED) |
8080 | { | |
0e454242 | 8081 | SWITCH_THRU_ALL_UIS () |
3b12939d PA |
8082 | if (current_ui->prompt_state == PROMPT_BLOCKED) |
8083 | { | |
223ffa71 | 8084 | target_terminal::ours_for_output (); |
3b12939d PA |
8085 | printf_filtered (_("No unwaited-for children left.\n")); |
8086 | } | |
0e5bf2a8 PA |
8087 | } |
8088 | ||
b57bacec | 8089 | /* Note: this depends on the update_thread_list call above. */ |
388a7084 | 8090 | maybe_remove_breakpoints (); |
c906108c | 8091 | |
c906108c SS |
8092 | /* If an auto-display called a function and that got a signal, |
8093 | delete that auto-display to avoid an infinite recursion. */ | |
8094 | ||
8095 | if (stopped_by_random_signal) | |
8096 | disable_current_display (); | |
8097 | ||
0e454242 | 8098 | SWITCH_THRU_ALL_UIS () |
3b12939d PA |
8099 | { |
8100 | async_enable_stdin (); | |
8101 | } | |
c906108c | 8102 | |
388a7084 | 8103 | /* Let the user/frontend see the threads as stopped. */ |
731f534f | 8104 | maybe_finish_thread_state.reset (); |
388a7084 PA |
8105 | |
8106 | /* Select innermost stack frame - i.e., current frame is frame 0, | |
8107 | and current location is based on that. Handle the case where the | |
8108 | dummy call is returning after being stopped. E.g. the dummy call | |
8109 | previously hit a breakpoint. (If the dummy call returns | |
8110 | normally, we won't reach here.) Do this before the stop hook is | |
8111 | run, so that it doesn't get to see the temporary dummy frame, | |
8112 | which is not where we'll present the stop. */ | |
8113 | if (has_stack_frames ()) | |
8114 | { | |
8115 | if (stop_stack_dummy == STOP_STACK_DUMMY) | |
8116 | { | |
8117 | /* Pop the empty frame that contains the stack dummy. This | |
8118 | also restores inferior state prior to the call (struct | |
8119 | infcall_suspend_state). */ | |
8120 | struct frame_info *frame = get_current_frame (); | |
8121 | ||
8122 | gdb_assert (get_frame_type (frame) == DUMMY_FRAME); | |
8123 | frame_pop (frame); | |
8124 | /* frame_pop calls reinit_frame_cache as the last thing it | |
8125 | does which means there's now no selected frame. */ | |
8126 | } | |
8127 | ||
8128 | select_frame (get_current_frame ()); | |
8129 | ||
8130 | /* Set the current source location. */ | |
8131 | set_current_sal_from_frame (get_current_frame ()); | |
8132 | } | |
dd7e2d2b PA |
8133 | |
8134 | /* Look up the hook_stop and run it (CLI internally handles problem | |
8135 | of stop_command's pre-hook not existing). */ | |
4c2f2a79 PA |
8136 | if (stop_command != NULL) |
8137 | { | |
2d844eaf | 8138 | stop_context saved_context; |
4c2f2a79 | 8139 | |
bf469271 PA |
8140 | TRY |
8141 | { | |
8142 | execute_cmd_pre_hook (stop_command); | |
8143 | } | |
8144 | CATCH (ex, RETURN_MASK_ALL) | |
8145 | { | |
8146 | exception_fprintf (gdb_stderr, ex, | |
8147 | "Error while running hook_stop:\n"); | |
8148 | } | |
8149 | END_CATCH | |
4c2f2a79 PA |
8150 | |
8151 | /* If the stop hook resumes the target, then there's no point in | |
8152 | trying to notify about the previous stop; its context is | |
8153 | gone. Likewise if the command switches thread or inferior -- | |
8154 | the observers would print a stop for the wrong | |
8155 | thread/inferior. */ | |
2d844eaf TT |
8156 | if (saved_context.changed ()) |
8157 | return 1; | |
4c2f2a79 | 8158 | } |
dd7e2d2b | 8159 | |
388a7084 PA |
8160 | /* Notify observers about the stop. This is where the interpreters |
8161 | print the stop event. */ | |
d7e15655 | 8162 | if (inferior_ptid != null_ptid) |
76727919 | 8163 | gdb::observers::normal_stop.notify (inferior_thread ()->control.stop_bpstat, |
388a7084 PA |
8164 | stop_print_frame); |
8165 | else | |
76727919 | 8166 | gdb::observers::normal_stop.notify (NULL, stop_print_frame); |
347bddb7 | 8167 | |
243a9253 PA |
8168 | annotate_stopped (); |
8169 | ||
48844aa6 PA |
8170 | if (target_has_execution) |
8171 | { | |
8172 | if (last.kind != TARGET_WAITKIND_SIGNALLED | |
8173 | && last.kind != TARGET_WAITKIND_EXITED) | |
8174 | /* Delete the breakpoint we stopped at, if it wants to be deleted. | |
8175 | Delete any breakpoint that is to be deleted at the next stop. */ | |
16c381f0 | 8176 | breakpoint_auto_delete (inferior_thread ()->control.stop_bpstat); |
94cc34af | 8177 | } |
6c95b8df PA |
8178 | |
8179 | /* Try to get rid of automatically added inferiors that are no | |
8180 | longer needed. Keeping those around slows down things linearly. | |
8181 | Note that this never removes the current inferior. */ | |
8182 | prune_inferiors (); | |
4c2f2a79 PA |
8183 | |
8184 | return 0; | |
c906108c | 8185 | } |
c906108c | 8186 | \f |
c5aa993b | 8187 | int |
96baa820 | 8188 | signal_stop_state (int signo) |
c906108c | 8189 | { |
d6b48e9c | 8190 | return signal_stop[signo]; |
c906108c SS |
8191 | } |
8192 | ||
c5aa993b | 8193 | int |
96baa820 | 8194 | signal_print_state (int signo) |
c906108c SS |
8195 | { |
8196 | return signal_print[signo]; | |
8197 | } | |
8198 | ||
c5aa993b | 8199 | int |
96baa820 | 8200 | signal_pass_state (int signo) |
c906108c SS |
8201 | { |
8202 | return signal_program[signo]; | |
8203 | } | |
8204 | ||
2455069d UW |
8205 | static void |
8206 | signal_cache_update (int signo) | |
8207 | { | |
8208 | if (signo == -1) | |
8209 | { | |
a493e3e2 | 8210 | for (signo = 0; signo < (int) GDB_SIGNAL_LAST; signo++) |
2455069d UW |
8211 | signal_cache_update (signo); |
8212 | ||
8213 | return; | |
8214 | } | |
8215 | ||
8216 | signal_pass[signo] = (signal_stop[signo] == 0 | |
8217 | && signal_print[signo] == 0 | |
ab04a2af TT |
8218 | && signal_program[signo] == 1 |
8219 | && signal_catch[signo] == 0); | |
2455069d UW |
8220 | } |
8221 | ||
488f131b | 8222 | int |
7bda5e4a | 8223 | signal_stop_update (int signo, int state) |
d4f3574e SS |
8224 | { |
8225 | int ret = signal_stop[signo]; | |
abbb1732 | 8226 | |
d4f3574e | 8227 | signal_stop[signo] = state; |
2455069d | 8228 | signal_cache_update (signo); |
d4f3574e SS |
8229 | return ret; |
8230 | } | |
8231 | ||
488f131b | 8232 | int |
7bda5e4a | 8233 | signal_print_update (int signo, int state) |
d4f3574e SS |
8234 | { |
8235 | int ret = signal_print[signo]; | |
abbb1732 | 8236 | |
d4f3574e | 8237 | signal_print[signo] = state; |
2455069d | 8238 | signal_cache_update (signo); |
d4f3574e SS |
8239 | return ret; |
8240 | } | |
8241 | ||
488f131b | 8242 | int |
7bda5e4a | 8243 | signal_pass_update (int signo, int state) |
d4f3574e SS |
8244 | { |
8245 | int ret = signal_program[signo]; | |
abbb1732 | 8246 | |
d4f3574e | 8247 | signal_program[signo] = state; |
2455069d | 8248 | signal_cache_update (signo); |
d4f3574e SS |
8249 | return ret; |
8250 | } | |
8251 | ||
ab04a2af TT |
8252 | /* Update the global 'signal_catch' from INFO and notify the |
8253 | target. */ | |
8254 | ||
8255 | void | |
8256 | signal_catch_update (const unsigned int *info) | |
8257 | { | |
8258 | int i; | |
8259 | ||
8260 | for (i = 0; i < GDB_SIGNAL_LAST; ++i) | |
8261 | signal_catch[i] = info[i] > 0; | |
8262 | signal_cache_update (-1); | |
8263 | target_pass_signals ((int) GDB_SIGNAL_LAST, signal_pass); | |
8264 | } | |
8265 | ||
c906108c | 8266 | static void |
96baa820 | 8267 | sig_print_header (void) |
c906108c | 8268 | { |
3e43a32a MS |
8269 | printf_filtered (_("Signal Stop\tPrint\tPass " |
8270 | "to program\tDescription\n")); | |
c906108c SS |
8271 | } |
8272 | ||
8273 | static void | |
2ea28649 | 8274 | sig_print_info (enum gdb_signal oursig) |
c906108c | 8275 | { |
2ea28649 | 8276 | const char *name = gdb_signal_to_name (oursig); |
c906108c | 8277 | int name_padding = 13 - strlen (name); |
96baa820 | 8278 | |
c906108c SS |
8279 | if (name_padding <= 0) |
8280 | name_padding = 0; | |
8281 | ||
8282 | printf_filtered ("%s", name); | |
488f131b | 8283 | printf_filtered ("%*.*s ", name_padding, name_padding, " "); |
c906108c SS |
8284 | printf_filtered ("%s\t", signal_stop[oursig] ? "Yes" : "No"); |
8285 | printf_filtered ("%s\t", signal_print[oursig] ? "Yes" : "No"); | |
8286 | printf_filtered ("%s\t\t", signal_program[oursig] ? "Yes" : "No"); | |
2ea28649 | 8287 | printf_filtered ("%s\n", gdb_signal_to_string (oursig)); |
c906108c SS |
8288 | } |
8289 | ||
8290 | /* Specify how various signals in the inferior should be handled. */ | |
8291 | ||
8292 | static void | |
0b39b52e | 8293 | handle_command (const char *args, int from_tty) |
c906108c | 8294 | { |
c906108c | 8295 | int digits, wordlen; |
b926417a | 8296 | int sigfirst, siglast; |
2ea28649 | 8297 | enum gdb_signal oursig; |
c906108c SS |
8298 | int allsigs; |
8299 | int nsigs; | |
8300 | unsigned char *sigs; | |
c906108c SS |
8301 | |
8302 | if (args == NULL) | |
8303 | { | |
e2e0b3e5 | 8304 | error_no_arg (_("signal to handle")); |
c906108c SS |
8305 | } |
8306 | ||
1777feb0 | 8307 | /* Allocate and zero an array of flags for which signals to handle. */ |
c906108c | 8308 | |
a493e3e2 | 8309 | nsigs = (int) GDB_SIGNAL_LAST; |
c906108c SS |
8310 | sigs = (unsigned char *) alloca (nsigs); |
8311 | memset (sigs, 0, nsigs); | |
8312 | ||
1777feb0 | 8313 | /* Break the command line up into args. */ |
c906108c | 8314 | |
773a1edc | 8315 | gdb_argv built_argv (args); |
c906108c SS |
8316 | |
8317 | /* Walk through the args, looking for signal oursigs, signal names, and | |
8318 | actions. Signal numbers and signal names may be interspersed with | |
8319 | actions, with the actions being performed for all signals cumulatively | |
1777feb0 | 8320 | specified. Signal ranges can be specified as <LOW>-<HIGH>. */ |
c906108c | 8321 | |
773a1edc | 8322 | for (char *arg : built_argv) |
c906108c | 8323 | { |
773a1edc TT |
8324 | wordlen = strlen (arg); |
8325 | for (digits = 0; isdigit (arg[digits]); digits++) | |
c906108c SS |
8326 | {; |
8327 | } | |
8328 | allsigs = 0; | |
8329 | sigfirst = siglast = -1; | |
8330 | ||
773a1edc | 8331 | if (wordlen >= 1 && !strncmp (arg, "all", wordlen)) |
c906108c SS |
8332 | { |
8333 | /* Apply action to all signals except those used by the | |
1777feb0 | 8334 | debugger. Silently skip those. */ |
c906108c SS |
8335 | allsigs = 1; |
8336 | sigfirst = 0; | |
8337 | siglast = nsigs - 1; | |
8338 | } | |
773a1edc | 8339 | else if (wordlen >= 1 && !strncmp (arg, "stop", wordlen)) |
c906108c SS |
8340 | { |
8341 | SET_SIGS (nsigs, sigs, signal_stop); | |
8342 | SET_SIGS (nsigs, sigs, signal_print); | |
8343 | } | |
773a1edc | 8344 | else if (wordlen >= 1 && !strncmp (arg, "ignore", wordlen)) |
c906108c SS |
8345 | { |
8346 | UNSET_SIGS (nsigs, sigs, signal_program); | |
8347 | } | |
773a1edc | 8348 | else if (wordlen >= 2 && !strncmp (arg, "print", wordlen)) |
c906108c SS |
8349 | { |
8350 | SET_SIGS (nsigs, sigs, signal_print); | |
8351 | } | |
773a1edc | 8352 | else if (wordlen >= 2 && !strncmp (arg, "pass", wordlen)) |
c906108c SS |
8353 | { |
8354 | SET_SIGS (nsigs, sigs, signal_program); | |
8355 | } | |
773a1edc | 8356 | else if (wordlen >= 3 && !strncmp (arg, "nostop", wordlen)) |
c906108c SS |
8357 | { |
8358 | UNSET_SIGS (nsigs, sigs, signal_stop); | |
8359 | } | |
773a1edc | 8360 | else if (wordlen >= 3 && !strncmp (arg, "noignore", wordlen)) |
c906108c SS |
8361 | { |
8362 | SET_SIGS (nsigs, sigs, signal_program); | |
8363 | } | |
773a1edc | 8364 | else if (wordlen >= 4 && !strncmp (arg, "noprint", wordlen)) |
c906108c SS |
8365 | { |
8366 | UNSET_SIGS (nsigs, sigs, signal_print); | |
8367 | UNSET_SIGS (nsigs, sigs, signal_stop); | |
8368 | } | |
773a1edc | 8369 | else if (wordlen >= 4 && !strncmp (arg, "nopass", wordlen)) |
c906108c SS |
8370 | { |
8371 | UNSET_SIGS (nsigs, sigs, signal_program); | |
8372 | } | |
8373 | else if (digits > 0) | |
8374 | { | |
8375 | /* It is numeric. The numeric signal refers to our own | |
8376 | internal signal numbering from target.h, not to host/target | |
8377 | signal number. This is a feature; users really should be | |
8378 | using symbolic names anyway, and the common ones like | |
8379 | SIGHUP, SIGINT, SIGALRM, etc. will work right anyway. */ | |
8380 | ||
8381 | sigfirst = siglast = (int) | |
773a1edc TT |
8382 | gdb_signal_from_command (atoi (arg)); |
8383 | if (arg[digits] == '-') | |
c906108c SS |
8384 | { |
8385 | siglast = (int) | |
773a1edc | 8386 | gdb_signal_from_command (atoi (arg + digits + 1)); |
c906108c SS |
8387 | } |
8388 | if (sigfirst > siglast) | |
8389 | { | |
1777feb0 | 8390 | /* Bet he didn't figure we'd think of this case... */ |
b926417a | 8391 | std::swap (sigfirst, siglast); |
c906108c SS |
8392 | } |
8393 | } | |
8394 | else | |
8395 | { | |
773a1edc | 8396 | oursig = gdb_signal_from_name (arg); |
a493e3e2 | 8397 | if (oursig != GDB_SIGNAL_UNKNOWN) |
c906108c SS |
8398 | { |
8399 | sigfirst = siglast = (int) oursig; | |
8400 | } | |
8401 | else | |
8402 | { | |
8403 | /* Not a number and not a recognized flag word => complain. */ | |
773a1edc | 8404 | error (_("Unrecognized or ambiguous flag word: \"%s\"."), arg); |
c906108c SS |
8405 | } |
8406 | } | |
8407 | ||
8408 | /* If any signal numbers or symbol names were found, set flags for | |
1777feb0 | 8409 | which signals to apply actions to. */ |
c906108c | 8410 | |
b926417a | 8411 | for (int signum = sigfirst; signum >= 0 && signum <= siglast; signum++) |
c906108c | 8412 | { |
2ea28649 | 8413 | switch ((enum gdb_signal) signum) |
c906108c | 8414 | { |
a493e3e2 PA |
8415 | case GDB_SIGNAL_TRAP: |
8416 | case GDB_SIGNAL_INT: | |
c906108c SS |
8417 | if (!allsigs && !sigs[signum]) |
8418 | { | |
9e2f0ad4 | 8419 | if (query (_("%s is used by the debugger.\n\ |
3e43a32a | 8420 | Are you sure you want to change it? "), |
2ea28649 | 8421 | gdb_signal_to_name ((enum gdb_signal) signum))) |
c906108c SS |
8422 | { |
8423 | sigs[signum] = 1; | |
8424 | } | |
8425 | else | |
8426 | { | |
a3f17187 | 8427 | printf_unfiltered (_("Not confirmed, unchanged.\n")); |
c906108c SS |
8428 | gdb_flush (gdb_stdout); |
8429 | } | |
8430 | } | |
8431 | break; | |
a493e3e2 PA |
8432 | case GDB_SIGNAL_0: |
8433 | case GDB_SIGNAL_DEFAULT: | |
8434 | case GDB_SIGNAL_UNKNOWN: | |
c906108c SS |
8435 | /* Make sure that "all" doesn't print these. */ |
8436 | break; | |
8437 | default: | |
8438 | sigs[signum] = 1; | |
8439 | break; | |
8440 | } | |
8441 | } | |
c906108c SS |
8442 | } |
8443 | ||
b926417a | 8444 | for (int signum = 0; signum < nsigs; signum++) |
3a031f65 PA |
8445 | if (sigs[signum]) |
8446 | { | |
2455069d | 8447 | signal_cache_update (-1); |
a493e3e2 PA |
8448 | target_pass_signals ((int) GDB_SIGNAL_LAST, signal_pass); |
8449 | target_program_signals ((int) GDB_SIGNAL_LAST, signal_program); | |
c906108c | 8450 | |
3a031f65 PA |
8451 | if (from_tty) |
8452 | { | |
8453 | /* Show the results. */ | |
8454 | sig_print_header (); | |
8455 | for (; signum < nsigs; signum++) | |
8456 | if (sigs[signum]) | |
aead7601 | 8457 | sig_print_info ((enum gdb_signal) signum); |
3a031f65 PA |
8458 | } |
8459 | ||
8460 | break; | |
8461 | } | |
c906108c SS |
8462 | } |
8463 | ||
de0bea00 MF |
8464 | /* Complete the "handle" command. */ |
8465 | ||
eb3ff9a5 | 8466 | static void |
de0bea00 | 8467 | handle_completer (struct cmd_list_element *ignore, |
eb3ff9a5 | 8468 | completion_tracker &tracker, |
6f937416 | 8469 | const char *text, const char *word) |
de0bea00 | 8470 | { |
de0bea00 MF |
8471 | static const char * const keywords[] = |
8472 | { | |
8473 | "all", | |
8474 | "stop", | |
8475 | "ignore", | |
8476 | "print", | |
8477 | "pass", | |
8478 | "nostop", | |
8479 | "noignore", | |
8480 | "noprint", | |
8481 | "nopass", | |
8482 | NULL, | |
8483 | }; | |
8484 | ||
eb3ff9a5 PA |
8485 | signal_completer (ignore, tracker, text, word); |
8486 | complete_on_enum (tracker, keywords, word, word); | |
de0bea00 MF |
8487 | } |
8488 | ||
2ea28649 PA |
8489 | enum gdb_signal |
8490 | gdb_signal_from_command (int num) | |
ed01b82c PA |
8491 | { |
8492 | if (num >= 1 && num <= 15) | |
2ea28649 | 8493 | return (enum gdb_signal) num; |
ed01b82c PA |
8494 | error (_("Only signals 1-15 are valid as numeric signals.\n\ |
8495 | Use \"info signals\" for a list of symbolic signals.")); | |
8496 | } | |
8497 | ||
c906108c SS |
8498 | /* Print current contents of the tables set by the handle command. |
8499 | It is possible we should just be printing signals actually used | |
8500 | by the current target (but for things to work right when switching | |
8501 | targets, all signals should be in the signal tables). */ | |
8502 | ||
8503 | static void | |
1d12d88f | 8504 | info_signals_command (const char *signum_exp, int from_tty) |
c906108c | 8505 | { |
2ea28649 | 8506 | enum gdb_signal oursig; |
abbb1732 | 8507 | |
c906108c SS |
8508 | sig_print_header (); |
8509 | ||
8510 | if (signum_exp) | |
8511 | { | |
8512 | /* First see if this is a symbol name. */ | |
2ea28649 | 8513 | oursig = gdb_signal_from_name (signum_exp); |
a493e3e2 | 8514 | if (oursig == GDB_SIGNAL_UNKNOWN) |
c906108c SS |
8515 | { |
8516 | /* No, try numeric. */ | |
8517 | oursig = | |
2ea28649 | 8518 | gdb_signal_from_command (parse_and_eval_long (signum_exp)); |
c906108c SS |
8519 | } |
8520 | sig_print_info (oursig); | |
8521 | return; | |
8522 | } | |
8523 | ||
8524 | printf_filtered ("\n"); | |
8525 | /* These ugly casts brought to you by the native VAX compiler. */ | |
a493e3e2 PA |
8526 | for (oursig = GDB_SIGNAL_FIRST; |
8527 | (int) oursig < (int) GDB_SIGNAL_LAST; | |
2ea28649 | 8528 | oursig = (enum gdb_signal) ((int) oursig + 1)) |
c906108c SS |
8529 | { |
8530 | QUIT; | |
8531 | ||
a493e3e2 PA |
8532 | if (oursig != GDB_SIGNAL_UNKNOWN |
8533 | && oursig != GDB_SIGNAL_DEFAULT && oursig != GDB_SIGNAL_0) | |
c906108c SS |
8534 | sig_print_info (oursig); |
8535 | } | |
8536 | ||
3e43a32a MS |
8537 | printf_filtered (_("\nUse the \"handle\" command " |
8538 | "to change these tables.\n")); | |
c906108c | 8539 | } |
4aa995e1 PA |
8540 | |
8541 | /* The $_siginfo convenience variable is a bit special. We don't know | |
8542 | for sure the type of the value until we actually have a chance to | |
7a9dd1b2 | 8543 | fetch the data. The type can change depending on gdbarch, so it is |
4aa995e1 PA |
8544 | also dependent on which thread you have selected. |
8545 | ||
8546 | 1. making $_siginfo be an internalvar that creates a new value on | |
8547 | access. | |
8548 | ||
8549 | 2. making the value of $_siginfo be an lval_computed value. */ | |
8550 | ||
8551 | /* This function implements the lval_computed support for reading a | |
8552 | $_siginfo value. */ | |
8553 | ||
8554 | static void | |
8555 | siginfo_value_read (struct value *v) | |
8556 | { | |
8557 | LONGEST transferred; | |
8558 | ||
a911d87a PA |
8559 | /* If we can access registers, so can we access $_siginfo. Likewise |
8560 | vice versa. */ | |
8561 | validate_registers_access (); | |
c709acd1 | 8562 | |
4aa995e1 | 8563 | transferred = |
8b88a78e | 8564 | target_read (current_top_target (), TARGET_OBJECT_SIGNAL_INFO, |
4aa995e1 PA |
8565 | NULL, |
8566 | value_contents_all_raw (v), | |
8567 | value_offset (v), | |
8568 | TYPE_LENGTH (value_type (v))); | |
8569 | ||
8570 | if (transferred != TYPE_LENGTH (value_type (v))) | |
8571 | error (_("Unable to read siginfo")); | |
8572 | } | |
8573 | ||
8574 | /* This function implements the lval_computed support for writing a | |
8575 | $_siginfo value. */ | |
8576 | ||
8577 | static void | |
8578 | siginfo_value_write (struct value *v, struct value *fromval) | |
8579 | { | |
8580 | LONGEST transferred; | |
8581 | ||
a911d87a PA |
8582 | /* If we can access registers, so can we access $_siginfo. Likewise |
8583 | vice versa. */ | |
8584 | validate_registers_access (); | |
c709acd1 | 8585 | |
8b88a78e | 8586 | transferred = target_write (current_top_target (), |
4aa995e1 PA |
8587 | TARGET_OBJECT_SIGNAL_INFO, |
8588 | NULL, | |
8589 | value_contents_all_raw (fromval), | |
8590 | value_offset (v), | |
8591 | TYPE_LENGTH (value_type (fromval))); | |
8592 | ||
8593 | if (transferred != TYPE_LENGTH (value_type (fromval))) | |
8594 | error (_("Unable to write siginfo")); | |
8595 | } | |
8596 | ||
c8f2448a | 8597 | static const struct lval_funcs siginfo_value_funcs = |
4aa995e1 PA |
8598 | { |
8599 | siginfo_value_read, | |
8600 | siginfo_value_write | |
8601 | }; | |
8602 | ||
8603 | /* Return a new value with the correct type for the siginfo object of | |
78267919 UW |
8604 | the current thread using architecture GDBARCH. Return a void value |
8605 | if there's no object available. */ | |
4aa995e1 | 8606 | |
2c0b251b | 8607 | static struct value * |
22d2b532 SDJ |
8608 | siginfo_make_value (struct gdbarch *gdbarch, struct internalvar *var, |
8609 | void *ignore) | |
4aa995e1 | 8610 | { |
4aa995e1 | 8611 | if (target_has_stack |
d7e15655 | 8612 | && inferior_ptid != null_ptid |
78267919 | 8613 | && gdbarch_get_siginfo_type_p (gdbarch)) |
4aa995e1 | 8614 | { |
78267919 | 8615 | struct type *type = gdbarch_get_siginfo_type (gdbarch); |
abbb1732 | 8616 | |
78267919 | 8617 | return allocate_computed_value (type, &siginfo_value_funcs, NULL); |
4aa995e1 PA |
8618 | } |
8619 | ||
78267919 | 8620 | return allocate_value (builtin_type (gdbarch)->builtin_void); |
4aa995e1 PA |
8621 | } |
8622 | ||
c906108c | 8623 | \f |
16c381f0 JK |
8624 | /* infcall_suspend_state contains state about the program itself like its |
8625 | registers and any signal it received when it last stopped. | |
8626 | This state must be restored regardless of how the inferior function call | |
8627 | ends (either successfully, or after it hits a breakpoint or signal) | |
8628 | if the program is to properly continue where it left off. */ | |
8629 | ||
6bf78e29 | 8630 | class infcall_suspend_state |
7a292a7a | 8631 | { |
6bf78e29 AB |
8632 | public: |
8633 | /* Capture state from GDBARCH, TP, and REGCACHE that must be restored | |
8634 | once the inferior function call has finished. */ | |
8635 | infcall_suspend_state (struct gdbarch *gdbarch, | |
8636 | const struct thread_info *tp, | |
8637 | struct regcache *regcache) | |
8638 | : m_thread_suspend (tp->suspend), | |
8639 | m_registers (new readonly_detached_regcache (*regcache)) | |
8640 | { | |
8641 | gdb::unique_xmalloc_ptr<gdb_byte> siginfo_data; | |
8642 | ||
8643 | if (gdbarch_get_siginfo_type_p (gdbarch)) | |
8644 | { | |
8645 | struct type *type = gdbarch_get_siginfo_type (gdbarch); | |
8646 | size_t len = TYPE_LENGTH (type); | |
8647 | ||
8648 | siginfo_data.reset ((gdb_byte *) xmalloc (len)); | |
8649 | ||
8650 | if (target_read (current_top_target (), TARGET_OBJECT_SIGNAL_INFO, NULL, | |
8651 | siginfo_data.get (), 0, len) != len) | |
8652 | { | |
8653 | /* Errors ignored. */ | |
8654 | siginfo_data.reset (nullptr); | |
8655 | } | |
8656 | } | |
8657 | ||
8658 | if (siginfo_data) | |
8659 | { | |
8660 | m_siginfo_gdbarch = gdbarch; | |
8661 | m_siginfo_data = std::move (siginfo_data); | |
8662 | } | |
8663 | } | |
8664 | ||
8665 | /* Return a pointer to the stored register state. */ | |
16c381f0 | 8666 | |
6bf78e29 AB |
8667 | readonly_detached_regcache *registers () const |
8668 | { | |
8669 | return m_registers.get (); | |
8670 | } | |
8671 | ||
8672 | /* Restores the stored state into GDBARCH, TP, and REGCACHE. */ | |
8673 | ||
8674 | void restore (struct gdbarch *gdbarch, | |
8675 | struct thread_info *tp, | |
8676 | struct regcache *regcache) const | |
8677 | { | |
8678 | tp->suspend = m_thread_suspend; | |
8679 | ||
8680 | if (m_siginfo_gdbarch == gdbarch) | |
8681 | { | |
8682 | struct type *type = gdbarch_get_siginfo_type (gdbarch); | |
8683 | ||
8684 | /* Errors ignored. */ | |
8685 | target_write (current_top_target (), TARGET_OBJECT_SIGNAL_INFO, NULL, | |
8686 | m_siginfo_data.get (), 0, TYPE_LENGTH (type)); | |
8687 | } | |
8688 | ||
8689 | /* The inferior can be gone if the user types "print exit(0)" | |
8690 | (and perhaps other times). */ | |
8691 | if (target_has_execution) | |
8692 | /* NB: The register write goes through to the target. */ | |
8693 | regcache->restore (registers ()); | |
8694 | } | |
8695 | ||
8696 | private: | |
8697 | /* How the current thread stopped before the inferior function call was | |
8698 | executed. */ | |
8699 | struct thread_suspend_state m_thread_suspend; | |
8700 | ||
8701 | /* The registers before the inferior function call was executed. */ | |
8702 | std::unique_ptr<readonly_detached_regcache> m_registers; | |
1736ad11 | 8703 | |
35515841 | 8704 | /* Format of SIGINFO_DATA or NULL if it is not present. */ |
6bf78e29 | 8705 | struct gdbarch *m_siginfo_gdbarch = nullptr; |
1736ad11 JK |
8706 | |
8707 | /* The inferior format depends on SIGINFO_GDBARCH and it has a length of | |
8708 | TYPE_LENGTH (gdbarch_get_siginfo_type ()). For different gdbarch the | |
8709 | content would be invalid. */ | |
6bf78e29 | 8710 | gdb::unique_xmalloc_ptr<gdb_byte> m_siginfo_data; |
b89667eb DE |
8711 | }; |
8712 | ||
cb524840 TT |
8713 | infcall_suspend_state_up |
8714 | save_infcall_suspend_state () | |
b89667eb | 8715 | { |
b89667eb | 8716 | struct thread_info *tp = inferior_thread (); |
1736ad11 | 8717 | struct regcache *regcache = get_current_regcache (); |
ac7936df | 8718 | struct gdbarch *gdbarch = regcache->arch (); |
1736ad11 | 8719 | |
6bf78e29 AB |
8720 | infcall_suspend_state_up inf_state |
8721 | (new struct infcall_suspend_state (gdbarch, tp, regcache)); | |
1736ad11 | 8722 | |
6bf78e29 AB |
8723 | /* Having saved the current state, adjust the thread state, discarding |
8724 | any stop signal information. The stop signal is not useful when | |
8725 | starting an inferior function call, and run_inferior_call will not use | |
8726 | the signal due to its `proceed' call with GDB_SIGNAL_0. */ | |
a493e3e2 | 8727 | tp->suspend.stop_signal = GDB_SIGNAL_0; |
35515841 | 8728 | |
b89667eb DE |
8729 | return inf_state; |
8730 | } | |
8731 | ||
8732 | /* Restore inferior session state to INF_STATE. */ | |
8733 | ||
8734 | void | |
16c381f0 | 8735 | restore_infcall_suspend_state (struct infcall_suspend_state *inf_state) |
b89667eb DE |
8736 | { |
8737 | struct thread_info *tp = inferior_thread (); | |
1736ad11 | 8738 | struct regcache *regcache = get_current_regcache (); |
ac7936df | 8739 | struct gdbarch *gdbarch = regcache->arch (); |
b89667eb | 8740 | |
6bf78e29 | 8741 | inf_state->restore (gdbarch, tp, regcache); |
16c381f0 | 8742 | discard_infcall_suspend_state (inf_state); |
b89667eb DE |
8743 | } |
8744 | ||
b89667eb | 8745 | void |
16c381f0 | 8746 | discard_infcall_suspend_state (struct infcall_suspend_state *inf_state) |
b89667eb | 8747 | { |
dd848631 | 8748 | delete inf_state; |
b89667eb DE |
8749 | } |
8750 | ||
daf6667d | 8751 | readonly_detached_regcache * |
16c381f0 | 8752 | get_infcall_suspend_state_regcache (struct infcall_suspend_state *inf_state) |
b89667eb | 8753 | { |
6bf78e29 | 8754 | return inf_state->registers (); |
b89667eb DE |
8755 | } |
8756 | ||
16c381f0 JK |
8757 | /* infcall_control_state contains state regarding gdb's control of the |
8758 | inferior itself like stepping control. It also contains session state like | |
8759 | the user's currently selected frame. */ | |
b89667eb | 8760 | |
16c381f0 | 8761 | struct infcall_control_state |
b89667eb | 8762 | { |
16c381f0 JK |
8763 | struct thread_control_state thread_control; |
8764 | struct inferior_control_state inferior_control; | |
d82142e2 JK |
8765 | |
8766 | /* Other fields: */ | |
ee841dd8 TT |
8767 | enum stop_stack_kind stop_stack_dummy = STOP_NONE; |
8768 | int stopped_by_random_signal = 0; | |
7a292a7a | 8769 | |
b89667eb | 8770 | /* ID if the selected frame when the inferior function call was made. */ |
ee841dd8 | 8771 | struct frame_id selected_frame_id {}; |
7a292a7a SS |
8772 | }; |
8773 | ||
c906108c | 8774 | /* Save all of the information associated with the inferior<==>gdb |
b89667eb | 8775 | connection. */ |
c906108c | 8776 | |
cb524840 TT |
8777 | infcall_control_state_up |
8778 | save_infcall_control_state () | |
c906108c | 8779 | { |
cb524840 | 8780 | infcall_control_state_up inf_status (new struct infcall_control_state); |
4e1c45ea | 8781 | struct thread_info *tp = inferior_thread (); |
d6b48e9c | 8782 | struct inferior *inf = current_inferior (); |
7a292a7a | 8783 | |
16c381f0 JK |
8784 | inf_status->thread_control = tp->control; |
8785 | inf_status->inferior_control = inf->control; | |
d82142e2 | 8786 | |
8358c15c | 8787 | tp->control.step_resume_breakpoint = NULL; |
5b79abe7 | 8788 | tp->control.exception_resume_breakpoint = NULL; |
8358c15c | 8789 | |
16c381f0 JK |
8790 | /* Save original bpstat chain to INF_STATUS; replace it in TP with copy of |
8791 | chain. If caller's caller is walking the chain, they'll be happier if we | |
8792 | hand them back the original chain when restore_infcall_control_state is | |
8793 | called. */ | |
8794 | tp->control.stop_bpstat = bpstat_copy (tp->control.stop_bpstat); | |
d82142e2 JK |
8795 | |
8796 | /* Other fields: */ | |
8797 | inf_status->stop_stack_dummy = stop_stack_dummy; | |
8798 | inf_status->stopped_by_random_signal = stopped_by_random_signal; | |
c5aa993b | 8799 | |
206415a3 | 8800 | inf_status->selected_frame_id = get_frame_id (get_selected_frame (NULL)); |
b89667eb | 8801 | |
7a292a7a | 8802 | return inf_status; |
c906108c SS |
8803 | } |
8804 | ||
bf469271 PA |
8805 | static void |
8806 | restore_selected_frame (const frame_id &fid) | |
c906108c | 8807 | { |
bf469271 | 8808 | frame_info *frame = frame_find_by_id (fid); |
c906108c | 8809 | |
aa0cd9c1 AC |
8810 | /* If inf_status->selected_frame_id is NULL, there was no previously |
8811 | selected frame. */ | |
101dcfbe | 8812 | if (frame == NULL) |
c906108c | 8813 | { |
8a3fe4f8 | 8814 | warning (_("Unable to restore previously selected frame.")); |
bf469271 | 8815 | return; |
c906108c SS |
8816 | } |
8817 | ||
0f7d239c | 8818 | select_frame (frame); |
c906108c SS |
8819 | } |
8820 | ||
b89667eb DE |
8821 | /* Restore inferior session state to INF_STATUS. */ |
8822 | ||
c906108c | 8823 | void |
16c381f0 | 8824 | restore_infcall_control_state (struct infcall_control_state *inf_status) |
c906108c | 8825 | { |
4e1c45ea | 8826 | struct thread_info *tp = inferior_thread (); |
d6b48e9c | 8827 | struct inferior *inf = current_inferior (); |
4e1c45ea | 8828 | |
8358c15c JK |
8829 | if (tp->control.step_resume_breakpoint) |
8830 | tp->control.step_resume_breakpoint->disposition = disp_del_at_next_stop; | |
8831 | ||
5b79abe7 TT |
8832 | if (tp->control.exception_resume_breakpoint) |
8833 | tp->control.exception_resume_breakpoint->disposition | |
8834 | = disp_del_at_next_stop; | |
8835 | ||
d82142e2 | 8836 | /* Handle the bpstat_copy of the chain. */ |
16c381f0 | 8837 | bpstat_clear (&tp->control.stop_bpstat); |
d82142e2 | 8838 | |
16c381f0 JK |
8839 | tp->control = inf_status->thread_control; |
8840 | inf->control = inf_status->inferior_control; | |
d82142e2 JK |
8841 | |
8842 | /* Other fields: */ | |
8843 | stop_stack_dummy = inf_status->stop_stack_dummy; | |
8844 | stopped_by_random_signal = inf_status->stopped_by_random_signal; | |
c906108c | 8845 | |
b89667eb | 8846 | if (target_has_stack) |
c906108c | 8847 | { |
bf469271 | 8848 | /* The point of the try/catch is that if the stack is clobbered, |
101dcfbe AC |
8849 | walking the stack might encounter a garbage pointer and |
8850 | error() trying to dereference it. */ | |
bf469271 PA |
8851 | TRY |
8852 | { | |
8853 | restore_selected_frame (inf_status->selected_frame_id); | |
8854 | } | |
8855 | CATCH (ex, RETURN_MASK_ERROR) | |
8856 | { | |
8857 | exception_fprintf (gdb_stderr, ex, | |
8858 | "Unable to restore previously selected frame:\n"); | |
8859 | /* Error in restoring the selected frame. Select the | |
8860 | innermost frame. */ | |
8861 | select_frame (get_current_frame ()); | |
8862 | } | |
8863 | END_CATCH | |
c906108c | 8864 | } |
c906108c | 8865 | |
ee841dd8 | 8866 | delete inf_status; |
7a292a7a | 8867 | } |
c906108c SS |
8868 | |
8869 | void | |
16c381f0 | 8870 | discard_infcall_control_state (struct infcall_control_state *inf_status) |
7a292a7a | 8871 | { |
8358c15c JK |
8872 | if (inf_status->thread_control.step_resume_breakpoint) |
8873 | inf_status->thread_control.step_resume_breakpoint->disposition | |
8874 | = disp_del_at_next_stop; | |
8875 | ||
5b79abe7 TT |
8876 | if (inf_status->thread_control.exception_resume_breakpoint) |
8877 | inf_status->thread_control.exception_resume_breakpoint->disposition | |
8878 | = disp_del_at_next_stop; | |
8879 | ||
1777feb0 | 8880 | /* See save_infcall_control_state for info on stop_bpstat. */ |
16c381f0 | 8881 | bpstat_clear (&inf_status->thread_control.stop_bpstat); |
8358c15c | 8882 | |
ee841dd8 | 8883 | delete inf_status; |
7a292a7a | 8884 | } |
b89667eb | 8885 | \f |
7f89fd65 | 8886 | /* See infrun.h. */ |
0c557179 SDJ |
8887 | |
8888 | void | |
8889 | clear_exit_convenience_vars (void) | |
8890 | { | |
8891 | clear_internalvar (lookup_internalvar ("_exitsignal")); | |
8892 | clear_internalvar (lookup_internalvar ("_exitcode")); | |
8893 | } | |
c5aa993b | 8894 | \f |
488f131b | 8895 | |
b2175913 MS |
8896 | /* User interface for reverse debugging: |
8897 | Set exec-direction / show exec-direction commands | |
8898 | (returns error unless target implements to_set_exec_direction method). */ | |
8899 | ||
170742de | 8900 | enum exec_direction_kind execution_direction = EXEC_FORWARD; |
b2175913 MS |
8901 | static const char exec_forward[] = "forward"; |
8902 | static const char exec_reverse[] = "reverse"; | |
8903 | static const char *exec_direction = exec_forward; | |
40478521 | 8904 | static const char *const exec_direction_names[] = { |
b2175913 MS |
8905 | exec_forward, |
8906 | exec_reverse, | |
8907 | NULL | |
8908 | }; | |
8909 | ||
8910 | static void | |
eb4c3f4a | 8911 | set_exec_direction_func (const char *args, int from_tty, |
b2175913 MS |
8912 | struct cmd_list_element *cmd) |
8913 | { | |
8914 | if (target_can_execute_reverse) | |
8915 | { | |
8916 | if (!strcmp (exec_direction, exec_forward)) | |
8917 | execution_direction = EXEC_FORWARD; | |
8918 | else if (!strcmp (exec_direction, exec_reverse)) | |
8919 | execution_direction = EXEC_REVERSE; | |
8920 | } | |
8bbed405 MS |
8921 | else |
8922 | { | |
8923 | exec_direction = exec_forward; | |
8924 | error (_("Target does not support this operation.")); | |
8925 | } | |
b2175913 MS |
8926 | } |
8927 | ||
8928 | static void | |
8929 | show_exec_direction_func (struct ui_file *out, int from_tty, | |
8930 | struct cmd_list_element *cmd, const char *value) | |
8931 | { | |
8932 | switch (execution_direction) { | |
8933 | case EXEC_FORWARD: | |
8934 | fprintf_filtered (out, _("Forward.\n")); | |
8935 | break; | |
8936 | case EXEC_REVERSE: | |
8937 | fprintf_filtered (out, _("Reverse.\n")); | |
8938 | break; | |
b2175913 | 8939 | default: |
d8b34453 PA |
8940 | internal_error (__FILE__, __LINE__, |
8941 | _("bogus execution_direction value: %d"), | |
8942 | (int) execution_direction); | |
b2175913 MS |
8943 | } |
8944 | } | |
8945 | ||
d4db2f36 PA |
8946 | static void |
8947 | show_schedule_multiple (struct ui_file *file, int from_tty, | |
8948 | struct cmd_list_element *c, const char *value) | |
8949 | { | |
3e43a32a MS |
8950 | fprintf_filtered (file, _("Resuming the execution of threads " |
8951 | "of all processes is %s.\n"), value); | |
d4db2f36 | 8952 | } |
ad52ddc6 | 8953 | |
22d2b532 SDJ |
8954 | /* Implementation of `siginfo' variable. */ |
8955 | ||
8956 | static const struct internalvar_funcs siginfo_funcs = | |
8957 | { | |
8958 | siginfo_make_value, | |
8959 | NULL, | |
8960 | NULL | |
8961 | }; | |
8962 | ||
372316f1 PA |
8963 | /* Callback for infrun's target events source. This is marked when a |
8964 | thread has a pending status to process. */ | |
8965 | ||
8966 | static void | |
8967 | infrun_async_inferior_event_handler (gdb_client_data data) | |
8968 | { | |
372316f1 PA |
8969 | inferior_event_handler (INF_REG_EVENT, NULL); |
8970 | } | |
8971 | ||
c906108c | 8972 | void |
96baa820 | 8973 | _initialize_infrun (void) |
c906108c | 8974 | { |
52f0bd74 AC |
8975 | int i; |
8976 | int numsigs; | |
de0bea00 | 8977 | struct cmd_list_element *c; |
c906108c | 8978 | |
372316f1 PA |
8979 | /* Register extra event sources in the event loop. */ |
8980 | infrun_async_inferior_event_token | |
8981 | = create_async_event_handler (infrun_async_inferior_event_handler, NULL); | |
8982 | ||
11db9430 | 8983 | add_info ("signals", info_signals_command, _("\ |
1bedd215 AC |
8984 | What debugger does when program gets various signals.\n\ |
8985 | Specify a signal as argument to print info on that signal only.")); | |
c906108c SS |
8986 | add_info_alias ("handle", "signals", 0); |
8987 | ||
de0bea00 | 8988 | c = add_com ("handle", class_run, handle_command, _("\ |
dfbd5e7b | 8989 | Specify how to handle signals.\n\ |
486c7739 | 8990 | Usage: handle SIGNAL [ACTIONS]\n\ |
c906108c | 8991 | Args are signals and actions to apply to those signals.\n\ |
dfbd5e7b | 8992 | If no actions are specified, the current settings for the specified signals\n\ |
486c7739 MF |
8993 | will be displayed instead.\n\ |
8994 | \n\ | |
c906108c SS |
8995 | Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\ |
8996 | from 1-15 are allowed for compatibility with old versions of GDB.\n\ | |
8997 | Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\ | |
8998 | The special arg \"all\" is recognized to mean all signals except those\n\ | |
1bedd215 | 8999 | used by the debugger, typically SIGTRAP and SIGINT.\n\ |
486c7739 | 9000 | \n\ |
1bedd215 | 9001 | Recognized actions include \"stop\", \"nostop\", \"print\", \"noprint\",\n\ |
c906108c SS |
9002 | \"pass\", \"nopass\", \"ignore\", or \"noignore\".\n\ |
9003 | Stop means reenter debugger if this signal happens (implies print).\n\ | |
9004 | Print means print a message if this signal happens.\n\ | |
9005 | Pass means let program see this signal; otherwise program doesn't know.\n\ | |
9006 | Ignore is a synonym for nopass and noignore is a synonym for pass.\n\ | |
dfbd5e7b PA |
9007 | Pass and Stop may be combined.\n\ |
9008 | \n\ | |
9009 | Multiple signals may be specified. Signal numbers and signal names\n\ | |
9010 | may be interspersed with actions, with the actions being performed for\n\ | |
9011 | all signals cumulatively specified.")); | |
de0bea00 | 9012 | set_cmd_completer (c, handle_completer); |
486c7739 | 9013 | |
c906108c | 9014 | if (!dbx_commands) |
1a966eab AC |
9015 | stop_command = add_cmd ("stop", class_obscure, |
9016 | not_just_help_class_command, _("\ | |
9017 | There is no `stop' command, but you can set a hook on `stop'.\n\ | |
c906108c | 9018 | This allows you to set a list of commands to be run each time execution\n\ |
1a966eab | 9019 | of the program stops."), &cmdlist); |
c906108c | 9020 | |
ccce17b0 | 9021 | add_setshow_zuinteger_cmd ("infrun", class_maintenance, &debug_infrun, _("\ |
85c07804 AC |
9022 | Set inferior debugging."), _("\ |
9023 | Show inferior debugging."), _("\ | |
9024 | When non-zero, inferior specific debugging is enabled."), | |
ccce17b0 YQ |
9025 | NULL, |
9026 | show_debug_infrun, | |
9027 | &setdebuglist, &showdebuglist); | |
527159b7 | 9028 | |
3e43a32a MS |
9029 | add_setshow_boolean_cmd ("displaced", class_maintenance, |
9030 | &debug_displaced, _("\ | |
237fc4c9 PA |
9031 | Set displaced stepping debugging."), _("\ |
9032 | Show displaced stepping debugging."), _("\ | |
9033 | When non-zero, displaced stepping specific debugging is enabled."), | |
9034 | NULL, | |
9035 | show_debug_displaced, | |
9036 | &setdebuglist, &showdebuglist); | |
9037 | ||
ad52ddc6 PA |
9038 | add_setshow_boolean_cmd ("non-stop", no_class, |
9039 | &non_stop_1, _("\ | |
9040 | Set whether gdb controls the inferior in non-stop mode."), _("\ | |
9041 | Show whether gdb controls the inferior in non-stop mode."), _("\ | |
9042 | When debugging a multi-threaded program and this setting is\n\ | |
9043 | off (the default, also called all-stop mode), when one thread stops\n\ | |
9044 | (for a breakpoint, watchpoint, exception, or similar events), GDB stops\n\ | |
9045 | all other threads in the program while you interact with the thread of\n\ | |
9046 | interest. When you continue or step a thread, you can allow the other\n\ | |
9047 | threads to run, or have them remain stopped, but while you inspect any\n\ | |
9048 | thread's state, all threads stop.\n\ | |
9049 | \n\ | |
9050 | In non-stop mode, when one thread stops, other threads can continue\n\ | |
9051 | to run freely. You'll be able to step each thread independently,\n\ | |
9052 | leave it stopped or free to run as needed."), | |
9053 | set_non_stop, | |
9054 | show_non_stop, | |
9055 | &setlist, | |
9056 | &showlist); | |
9057 | ||
a493e3e2 | 9058 | numsigs = (int) GDB_SIGNAL_LAST; |
8d749320 SM |
9059 | signal_stop = XNEWVEC (unsigned char, numsigs); |
9060 | signal_print = XNEWVEC (unsigned char, numsigs); | |
9061 | signal_program = XNEWVEC (unsigned char, numsigs); | |
9062 | signal_catch = XNEWVEC (unsigned char, numsigs); | |
9063 | signal_pass = XNEWVEC (unsigned char, numsigs); | |
c906108c SS |
9064 | for (i = 0; i < numsigs; i++) |
9065 | { | |
9066 | signal_stop[i] = 1; | |
9067 | signal_print[i] = 1; | |
9068 | signal_program[i] = 1; | |
ab04a2af | 9069 | signal_catch[i] = 0; |
c906108c SS |
9070 | } |
9071 | ||
4d9d9d04 PA |
9072 | /* Signals caused by debugger's own actions should not be given to |
9073 | the program afterwards. | |
9074 | ||
9075 | Do not deliver GDB_SIGNAL_TRAP by default, except when the user | |
9076 | explicitly specifies that it should be delivered to the target | |
9077 | program. Typically, that would occur when a user is debugging a | |
9078 | target monitor on a simulator: the target monitor sets a | |
9079 | breakpoint; the simulator encounters this breakpoint and halts | |
9080 | the simulation handing control to GDB; GDB, noting that the stop | |
9081 | address doesn't map to any known breakpoint, returns control back | |
9082 | to the simulator; the simulator then delivers the hardware | |
9083 | equivalent of a GDB_SIGNAL_TRAP to the program being | |
9084 | debugged. */ | |
a493e3e2 PA |
9085 | signal_program[GDB_SIGNAL_TRAP] = 0; |
9086 | signal_program[GDB_SIGNAL_INT] = 0; | |
c906108c SS |
9087 | |
9088 | /* Signals that are not errors should not normally enter the debugger. */ | |
a493e3e2 PA |
9089 | signal_stop[GDB_SIGNAL_ALRM] = 0; |
9090 | signal_print[GDB_SIGNAL_ALRM] = 0; | |
9091 | signal_stop[GDB_SIGNAL_VTALRM] = 0; | |
9092 | signal_print[GDB_SIGNAL_VTALRM] = 0; | |
9093 | signal_stop[GDB_SIGNAL_PROF] = 0; | |
9094 | signal_print[GDB_SIGNAL_PROF] = 0; | |
9095 | signal_stop[GDB_SIGNAL_CHLD] = 0; | |
9096 | signal_print[GDB_SIGNAL_CHLD] = 0; | |
9097 | signal_stop[GDB_SIGNAL_IO] = 0; | |
9098 | signal_print[GDB_SIGNAL_IO] = 0; | |
9099 | signal_stop[GDB_SIGNAL_POLL] = 0; | |
9100 | signal_print[GDB_SIGNAL_POLL] = 0; | |
9101 | signal_stop[GDB_SIGNAL_URG] = 0; | |
9102 | signal_print[GDB_SIGNAL_URG] = 0; | |
9103 | signal_stop[GDB_SIGNAL_WINCH] = 0; | |
9104 | signal_print[GDB_SIGNAL_WINCH] = 0; | |
9105 | signal_stop[GDB_SIGNAL_PRIO] = 0; | |
9106 | signal_print[GDB_SIGNAL_PRIO] = 0; | |
c906108c | 9107 | |
cd0fc7c3 SS |
9108 | /* These signals are used internally by user-level thread |
9109 | implementations. (See signal(5) on Solaris.) Like the above | |
9110 | signals, a healthy program receives and handles them as part of | |
9111 | its normal operation. */ | |
a493e3e2 PA |
9112 | signal_stop[GDB_SIGNAL_LWP] = 0; |
9113 | signal_print[GDB_SIGNAL_LWP] = 0; | |
9114 | signal_stop[GDB_SIGNAL_WAITING] = 0; | |
9115 | signal_print[GDB_SIGNAL_WAITING] = 0; | |
9116 | signal_stop[GDB_SIGNAL_CANCEL] = 0; | |
9117 | signal_print[GDB_SIGNAL_CANCEL] = 0; | |
bc7b765a JB |
9118 | signal_stop[GDB_SIGNAL_LIBRT] = 0; |
9119 | signal_print[GDB_SIGNAL_LIBRT] = 0; | |
cd0fc7c3 | 9120 | |
2455069d UW |
9121 | /* Update cached state. */ |
9122 | signal_cache_update (-1); | |
9123 | ||
85c07804 AC |
9124 | add_setshow_zinteger_cmd ("stop-on-solib-events", class_support, |
9125 | &stop_on_solib_events, _("\ | |
9126 | Set stopping for shared library events."), _("\ | |
9127 | Show stopping for shared library events."), _("\ | |
c906108c SS |
9128 | If nonzero, gdb will give control to the user when the dynamic linker\n\ |
9129 | notifies gdb of shared library events. The most common event of interest\n\ | |
85c07804 | 9130 | to the user would be loading/unloading of a new library."), |
f9e14852 | 9131 | set_stop_on_solib_events, |
920d2a44 | 9132 | show_stop_on_solib_events, |
85c07804 | 9133 | &setlist, &showlist); |
c906108c | 9134 | |
7ab04401 AC |
9135 | add_setshow_enum_cmd ("follow-fork-mode", class_run, |
9136 | follow_fork_mode_kind_names, | |
9137 | &follow_fork_mode_string, _("\ | |
9138 | Set debugger response to a program call of fork or vfork."), _("\ | |
9139 | Show debugger response to a program call of fork or vfork."), _("\ | |
c906108c SS |
9140 | A fork or vfork creates a new process. follow-fork-mode can be:\n\ |
9141 | parent - the original process is debugged after a fork\n\ | |
9142 | child - the new process is debugged after a fork\n\ | |
ea1dd7bc | 9143 | The unfollowed process will continue to run.\n\ |
7ab04401 AC |
9144 | By default, the debugger will follow the parent process."), |
9145 | NULL, | |
920d2a44 | 9146 | show_follow_fork_mode_string, |
7ab04401 AC |
9147 | &setlist, &showlist); |
9148 | ||
6c95b8df PA |
9149 | add_setshow_enum_cmd ("follow-exec-mode", class_run, |
9150 | follow_exec_mode_names, | |
9151 | &follow_exec_mode_string, _("\ | |
9152 | Set debugger response to a program call of exec."), _("\ | |
9153 | Show debugger response to a program call of exec."), _("\ | |
9154 | An exec call replaces the program image of a process.\n\ | |
9155 | \n\ | |
9156 | follow-exec-mode can be:\n\ | |
9157 | \n\ | |
cce7e648 | 9158 | new - the debugger creates a new inferior and rebinds the process\n\ |
6c95b8df PA |
9159 | to this new inferior. The program the process was running before\n\ |
9160 | the exec call can be restarted afterwards by restarting the original\n\ | |
9161 | inferior.\n\ | |
9162 | \n\ | |
9163 | same - the debugger keeps the process bound to the same inferior.\n\ | |
9164 | The new executable image replaces the previous executable loaded in\n\ | |
9165 | the inferior. Restarting the inferior after the exec call restarts\n\ | |
9166 | the executable the process was running after the exec call.\n\ | |
9167 | \n\ | |
9168 | By default, the debugger will use the same inferior."), | |
9169 | NULL, | |
9170 | show_follow_exec_mode_string, | |
9171 | &setlist, &showlist); | |
9172 | ||
7ab04401 AC |
9173 | add_setshow_enum_cmd ("scheduler-locking", class_run, |
9174 | scheduler_enums, &scheduler_mode, _("\ | |
9175 | Set mode for locking scheduler during execution."), _("\ | |
9176 | Show mode for locking scheduler during execution."), _("\ | |
f2665db5 MM |
9177 | off == no locking (threads may preempt at any time)\n\ |
9178 | on == full locking (no thread except the current thread may run)\n\ | |
9179 | This applies to both normal execution and replay mode.\n\ | |
9180 | step == scheduler locked during stepping commands (step, next, stepi, nexti).\n\ | |
9181 | In this mode, other threads may run during other commands.\n\ | |
9182 | This applies to both normal execution and replay mode.\n\ | |
9183 | replay == scheduler locked in replay mode and unlocked during normal execution."), | |
7ab04401 | 9184 | set_schedlock_func, /* traps on target vector */ |
920d2a44 | 9185 | show_scheduler_mode, |
7ab04401 | 9186 | &setlist, &showlist); |
5fbbeb29 | 9187 | |
d4db2f36 PA |
9188 | add_setshow_boolean_cmd ("schedule-multiple", class_run, &sched_multi, _("\ |
9189 | Set mode for resuming threads of all processes."), _("\ | |
9190 | Show mode for resuming threads of all processes."), _("\ | |
9191 | When on, execution commands (such as 'continue' or 'next') resume all\n\ | |
9192 | threads of all processes. When off (which is the default), execution\n\ | |
9193 | commands only resume the threads of the current process. The set of\n\ | |
9194 | threads that are resumed is further refined by the scheduler-locking\n\ | |
9195 | mode (see help set scheduler-locking)."), | |
9196 | NULL, | |
9197 | show_schedule_multiple, | |
9198 | &setlist, &showlist); | |
9199 | ||
5bf193a2 AC |
9200 | add_setshow_boolean_cmd ("step-mode", class_run, &step_stop_if_no_debug, _("\ |
9201 | Set mode of the step operation."), _("\ | |
9202 | Show mode of the step operation."), _("\ | |
9203 | When set, doing a step over a function without debug line information\n\ | |
9204 | will stop at the first instruction of that function. Otherwise, the\n\ | |
9205 | function is skipped and the step command stops at a different source line."), | |
9206 | NULL, | |
920d2a44 | 9207 | show_step_stop_if_no_debug, |
5bf193a2 | 9208 | &setlist, &showlist); |
ca6724c1 | 9209 | |
72d0e2c5 YQ |
9210 | add_setshow_auto_boolean_cmd ("displaced-stepping", class_run, |
9211 | &can_use_displaced_stepping, _("\ | |
237fc4c9 PA |
9212 | Set debugger's willingness to use displaced stepping."), _("\ |
9213 | Show debugger's willingness to use displaced stepping."), _("\ | |
fff08868 HZ |
9214 | If on, gdb will use displaced stepping to step over breakpoints if it is\n\ |
9215 | supported by the target architecture. If off, gdb will not use displaced\n\ | |
9216 | stepping to step over breakpoints, even if such is supported by the target\n\ | |
9217 | architecture. If auto (which is the default), gdb will use displaced stepping\n\ | |
9218 | if the target architecture supports it and non-stop mode is active, but will not\n\ | |
9219 | use it in all-stop mode (see help set non-stop)."), | |
72d0e2c5 YQ |
9220 | NULL, |
9221 | show_can_use_displaced_stepping, | |
9222 | &setlist, &showlist); | |
237fc4c9 | 9223 | |
b2175913 MS |
9224 | add_setshow_enum_cmd ("exec-direction", class_run, exec_direction_names, |
9225 | &exec_direction, _("Set direction of execution.\n\ | |
9226 | Options are 'forward' or 'reverse'."), | |
9227 | _("Show direction of execution (forward/reverse)."), | |
9228 | _("Tells gdb whether to execute forward or backward."), | |
9229 | set_exec_direction_func, show_exec_direction_func, | |
9230 | &setlist, &showlist); | |
9231 | ||
6c95b8df PA |
9232 | /* Set/show detach-on-fork: user-settable mode. */ |
9233 | ||
9234 | add_setshow_boolean_cmd ("detach-on-fork", class_run, &detach_fork, _("\ | |
9235 | Set whether gdb will detach the child of a fork."), _("\ | |
9236 | Show whether gdb will detach the child of a fork."), _("\ | |
9237 | Tells gdb whether to detach the child of a fork."), | |
9238 | NULL, NULL, &setlist, &showlist); | |
9239 | ||
03583c20 UW |
9240 | /* Set/show disable address space randomization mode. */ |
9241 | ||
9242 | add_setshow_boolean_cmd ("disable-randomization", class_support, | |
9243 | &disable_randomization, _("\ | |
9244 | Set disabling of debuggee's virtual address space randomization."), _("\ | |
9245 | Show disabling of debuggee's virtual address space randomization."), _("\ | |
9246 | When this mode is on (which is the default), randomization of the virtual\n\ | |
9247 | address space is disabled. Standalone programs run with the randomization\n\ | |
9248 | enabled by default on some platforms."), | |
9249 | &set_disable_randomization, | |
9250 | &show_disable_randomization, | |
9251 | &setlist, &showlist); | |
9252 | ||
ca6724c1 | 9253 | /* ptid initializations */ |
ca6724c1 KB |
9254 | inferior_ptid = null_ptid; |
9255 | target_last_wait_ptid = minus_one_ptid; | |
5231c1fd | 9256 | |
76727919 TT |
9257 | gdb::observers::thread_ptid_changed.attach (infrun_thread_ptid_changed); |
9258 | gdb::observers::thread_stop_requested.attach (infrun_thread_stop_requested); | |
9259 | gdb::observers::thread_exit.attach (infrun_thread_thread_exit); | |
9260 | gdb::observers::inferior_exit.attach (infrun_inferior_exit); | |
4aa995e1 PA |
9261 | |
9262 | /* Explicitly create without lookup, since that tries to create a | |
9263 | value with a void typed value, and when we get here, gdbarch | |
9264 | isn't initialized yet. At this point, we're quite sure there | |
9265 | isn't another convenience variable of the same name. */ | |
22d2b532 | 9266 | create_internalvar_type_lazy ("_siginfo", &siginfo_funcs, NULL); |
d914c394 SS |
9267 | |
9268 | add_setshow_boolean_cmd ("observer", no_class, | |
9269 | &observer_mode_1, _("\ | |
9270 | Set whether gdb controls the inferior in observer mode."), _("\ | |
9271 | Show whether gdb controls the inferior in observer mode."), _("\ | |
9272 | In observer mode, GDB can get data from the inferior, but not\n\ | |
9273 | affect its execution. Registers and memory may not be changed,\n\ | |
9274 | breakpoints may not be set, and the program cannot be interrupted\n\ | |
9275 | or signalled."), | |
9276 | set_observer_mode, | |
9277 | show_observer_mode, | |
9278 | &setlist, | |
9279 | &showlist); | |
c906108c | 9280 | } |