Commit | Line | Data |
---|---|---|
ca557f44 AC |
1 | /* Target-struct-independent code to start (run) and stop an inferior |
2 | process. | |
8926118c | 3 | |
61baf725 | 4 | Copyright (C) 1986-2017 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" |
06600e06 | 41 | #include "observer.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" |
c906108c SS |
70 | |
71 | /* Prototypes for local functions */ | |
72 | ||
11db9430 | 73 | static void info_signals_command (char *, int); |
c906108c | 74 | |
96baa820 | 75 | static void handle_command (char *, int); |
c906108c | 76 | |
2ea28649 | 77 | static void sig_print_info (enum gdb_signal); |
c906108c | 78 | |
96baa820 | 79 | static void sig_print_header (void); |
c906108c | 80 | |
74b7792f | 81 | static void resume_cleanups (void *); |
c906108c | 82 | |
4ef3f3be | 83 | static int follow_fork (void); |
96baa820 | 84 | |
d83ad864 DB |
85 | static int follow_fork_inferior (int follow_child, int detach_fork); |
86 | ||
87 | static void follow_inferior_reset_breakpoints (void); | |
88 | ||
96baa820 | 89 | static void set_schedlock_func (char *args, int from_tty, |
488f131b | 90 | struct cmd_list_element *c); |
96baa820 | 91 | |
a289b8f6 JK |
92 | static int currently_stepping (struct thread_info *tp); |
93 | ||
e58b0e63 PA |
94 | void nullify_last_target_wait_ptid (void); |
95 | ||
2c03e5be | 96 | static void insert_hp_step_resume_breakpoint_at_frame (struct frame_info *); |
2484c66b UW |
97 | |
98 | static void insert_step_resume_breakpoint_at_caller (struct frame_info *); | |
99 | ||
2484c66b UW |
100 | static void insert_longjmp_resume_breakpoint (struct gdbarch *, CORE_ADDR); |
101 | ||
8550d3b3 YQ |
102 | static int maybe_software_singlestep (struct gdbarch *gdbarch, CORE_ADDR pc); |
103 | ||
372316f1 PA |
104 | /* Asynchronous signal handler registered as event loop source for |
105 | when we have pending events ready to be passed to the core. */ | |
106 | static struct async_event_handler *infrun_async_inferior_event_token; | |
107 | ||
108 | /* Stores whether infrun_async was previously enabled or disabled. | |
109 | Starts off as -1, indicating "never enabled/disabled". */ | |
110 | static int infrun_is_async = -1; | |
111 | ||
112 | /* See infrun.h. */ | |
113 | ||
114 | void | |
115 | infrun_async (int enable) | |
116 | { | |
117 | if (infrun_is_async != enable) | |
118 | { | |
119 | infrun_is_async = enable; | |
120 | ||
121 | if (debug_infrun) | |
122 | fprintf_unfiltered (gdb_stdlog, | |
123 | "infrun: infrun_async(%d)\n", | |
124 | enable); | |
125 | ||
126 | if (enable) | |
127 | mark_async_event_handler (infrun_async_inferior_event_token); | |
128 | else | |
129 | clear_async_event_handler (infrun_async_inferior_event_token); | |
130 | } | |
131 | } | |
132 | ||
0b333c5e PA |
133 | /* See infrun.h. */ |
134 | ||
135 | void | |
136 | mark_infrun_async_event_handler (void) | |
137 | { | |
138 | mark_async_event_handler (infrun_async_inferior_event_token); | |
139 | } | |
140 | ||
5fbbeb29 CF |
141 | /* When set, stop the 'step' command if we enter a function which has |
142 | no line number information. The normal behavior is that we step | |
143 | over such function. */ | |
144 | int step_stop_if_no_debug = 0; | |
920d2a44 AC |
145 | static void |
146 | show_step_stop_if_no_debug (struct ui_file *file, int from_tty, | |
147 | struct cmd_list_element *c, const char *value) | |
148 | { | |
149 | fprintf_filtered (file, _("Mode of the step operation is %s.\n"), value); | |
150 | } | |
5fbbeb29 | 151 | |
b9f437de PA |
152 | /* proceed and normal_stop use this to notify the user when the |
153 | inferior stopped in a different thread than it had been running | |
154 | in. */ | |
96baa820 | 155 | |
39f77062 | 156 | static ptid_t previous_inferior_ptid; |
7a292a7a | 157 | |
07107ca6 LM |
158 | /* If set (default for legacy reasons), when following a fork, GDB |
159 | will detach from one of the fork branches, child or parent. | |
160 | Exactly which branch is detached depends on 'set follow-fork-mode' | |
161 | setting. */ | |
162 | ||
163 | static int detach_fork = 1; | |
6c95b8df | 164 | |
237fc4c9 PA |
165 | int debug_displaced = 0; |
166 | static void | |
167 | show_debug_displaced (struct ui_file *file, int from_tty, | |
168 | struct cmd_list_element *c, const char *value) | |
169 | { | |
170 | fprintf_filtered (file, _("Displace stepping debugging is %s.\n"), value); | |
171 | } | |
172 | ||
ccce17b0 | 173 | unsigned int debug_infrun = 0; |
920d2a44 AC |
174 | static void |
175 | show_debug_infrun (struct ui_file *file, int from_tty, | |
176 | struct cmd_list_element *c, const char *value) | |
177 | { | |
178 | fprintf_filtered (file, _("Inferior debugging is %s.\n"), value); | |
179 | } | |
527159b7 | 180 | |
03583c20 UW |
181 | |
182 | /* Support for disabling address space randomization. */ | |
183 | ||
184 | int disable_randomization = 1; | |
185 | ||
186 | static void | |
187 | show_disable_randomization (struct ui_file *file, int from_tty, | |
188 | struct cmd_list_element *c, const char *value) | |
189 | { | |
190 | if (target_supports_disable_randomization ()) | |
191 | fprintf_filtered (file, | |
192 | _("Disabling randomization of debuggee's " | |
193 | "virtual address space is %s.\n"), | |
194 | value); | |
195 | else | |
196 | fputs_filtered (_("Disabling randomization of debuggee's " | |
197 | "virtual address space is unsupported on\n" | |
198 | "this platform.\n"), file); | |
199 | } | |
200 | ||
201 | static void | |
202 | set_disable_randomization (char *args, int from_tty, | |
203 | struct cmd_list_element *c) | |
204 | { | |
205 | if (!target_supports_disable_randomization ()) | |
206 | error (_("Disabling randomization of debuggee's " | |
207 | "virtual address space is unsupported on\n" | |
208 | "this platform.")); | |
209 | } | |
210 | ||
d32dc48e PA |
211 | /* User interface for non-stop mode. */ |
212 | ||
213 | int non_stop = 0; | |
214 | static int non_stop_1 = 0; | |
215 | ||
216 | static void | |
217 | set_non_stop (char *args, int from_tty, | |
218 | struct cmd_list_element *c) | |
219 | { | |
220 | if (target_has_execution) | |
221 | { | |
222 | non_stop_1 = non_stop; | |
223 | error (_("Cannot change this setting while the inferior is running.")); | |
224 | } | |
225 | ||
226 | non_stop = non_stop_1; | |
227 | } | |
228 | ||
229 | static void | |
230 | show_non_stop (struct ui_file *file, int from_tty, | |
231 | struct cmd_list_element *c, const char *value) | |
232 | { | |
233 | fprintf_filtered (file, | |
234 | _("Controlling the inferior in non-stop mode is %s.\n"), | |
235 | value); | |
236 | } | |
237 | ||
d914c394 SS |
238 | /* "Observer mode" is somewhat like a more extreme version of |
239 | non-stop, in which all GDB operations that might affect the | |
240 | target's execution have been disabled. */ | |
241 | ||
d914c394 SS |
242 | int observer_mode = 0; |
243 | static int observer_mode_1 = 0; | |
244 | ||
245 | static void | |
246 | set_observer_mode (char *args, int from_tty, | |
247 | struct cmd_list_element *c) | |
248 | { | |
d914c394 SS |
249 | if (target_has_execution) |
250 | { | |
251 | observer_mode_1 = observer_mode; | |
252 | error (_("Cannot change this setting while the inferior is running.")); | |
253 | } | |
254 | ||
255 | observer_mode = observer_mode_1; | |
256 | ||
257 | may_write_registers = !observer_mode; | |
258 | may_write_memory = !observer_mode; | |
259 | may_insert_breakpoints = !observer_mode; | |
260 | may_insert_tracepoints = !observer_mode; | |
261 | /* We can insert fast tracepoints in or out of observer mode, | |
262 | but enable them if we're going into this mode. */ | |
263 | if (observer_mode) | |
264 | may_insert_fast_tracepoints = 1; | |
265 | may_stop = !observer_mode; | |
266 | update_target_permissions (); | |
267 | ||
268 | /* Going *into* observer mode we must force non-stop, then | |
269 | going out we leave it that way. */ | |
270 | if (observer_mode) | |
271 | { | |
d914c394 SS |
272 | pagination_enabled = 0; |
273 | non_stop = non_stop_1 = 1; | |
274 | } | |
275 | ||
276 | if (from_tty) | |
277 | printf_filtered (_("Observer mode is now %s.\n"), | |
278 | (observer_mode ? "on" : "off")); | |
279 | } | |
280 | ||
281 | static void | |
282 | show_observer_mode (struct ui_file *file, int from_tty, | |
283 | struct cmd_list_element *c, const char *value) | |
284 | { | |
285 | fprintf_filtered (file, _("Observer mode is %s.\n"), value); | |
286 | } | |
287 | ||
288 | /* This updates the value of observer mode based on changes in | |
289 | permissions. Note that we are deliberately ignoring the values of | |
290 | may-write-registers and may-write-memory, since the user may have | |
291 | reason to enable these during a session, for instance to turn on a | |
292 | debugging-related global. */ | |
293 | ||
294 | void | |
295 | update_observer_mode (void) | |
296 | { | |
297 | int newval; | |
298 | ||
299 | newval = (!may_insert_breakpoints | |
300 | && !may_insert_tracepoints | |
301 | && may_insert_fast_tracepoints | |
302 | && !may_stop | |
303 | && non_stop); | |
304 | ||
305 | /* Let the user know if things change. */ | |
306 | if (newval != observer_mode) | |
307 | printf_filtered (_("Observer mode is now %s.\n"), | |
308 | (newval ? "on" : "off")); | |
309 | ||
310 | observer_mode = observer_mode_1 = newval; | |
311 | } | |
c2c6d25f | 312 | |
c906108c SS |
313 | /* Tables of how to react to signals; the user sets them. */ |
314 | ||
315 | static unsigned char *signal_stop; | |
316 | static unsigned char *signal_print; | |
317 | static unsigned char *signal_program; | |
318 | ||
ab04a2af TT |
319 | /* Table of signals that are registered with "catch signal". A |
320 | non-zero entry indicates that the signal is caught by some "catch | |
321 | signal" command. This has size GDB_SIGNAL_LAST, to accommodate all | |
322 | signals. */ | |
323 | static unsigned char *signal_catch; | |
324 | ||
2455069d UW |
325 | /* Table of signals that the target may silently handle. |
326 | This is automatically determined from the flags above, | |
327 | and simply cached here. */ | |
328 | static unsigned char *signal_pass; | |
329 | ||
c906108c SS |
330 | #define SET_SIGS(nsigs,sigs,flags) \ |
331 | do { \ | |
332 | int signum = (nsigs); \ | |
333 | while (signum-- > 0) \ | |
334 | if ((sigs)[signum]) \ | |
335 | (flags)[signum] = 1; \ | |
336 | } while (0) | |
337 | ||
338 | #define UNSET_SIGS(nsigs,sigs,flags) \ | |
339 | do { \ | |
340 | int signum = (nsigs); \ | |
341 | while (signum-- > 0) \ | |
342 | if ((sigs)[signum]) \ | |
343 | (flags)[signum] = 0; \ | |
344 | } while (0) | |
345 | ||
9b224c5e PA |
346 | /* Update the target's copy of SIGNAL_PROGRAM. The sole purpose of |
347 | this function is to avoid exporting `signal_program'. */ | |
348 | ||
349 | void | |
350 | update_signals_program_target (void) | |
351 | { | |
a493e3e2 | 352 | target_program_signals ((int) GDB_SIGNAL_LAST, signal_program); |
9b224c5e PA |
353 | } |
354 | ||
1777feb0 | 355 | /* Value to pass to target_resume() to cause all threads to resume. */ |
39f77062 | 356 | |
edb3359d | 357 | #define RESUME_ALL minus_one_ptid |
c906108c SS |
358 | |
359 | /* Command list pointer for the "stop" placeholder. */ | |
360 | ||
361 | static struct cmd_list_element *stop_command; | |
362 | ||
c906108c SS |
363 | /* Nonzero if we want to give control to the user when we're notified |
364 | of shared library events by the dynamic linker. */ | |
628fe4e4 | 365 | int stop_on_solib_events; |
f9e14852 GB |
366 | |
367 | /* Enable or disable optional shared library event breakpoints | |
368 | as appropriate when the above flag is changed. */ | |
369 | ||
370 | static void | |
371 | set_stop_on_solib_events (char *args, int from_tty, struct cmd_list_element *c) | |
372 | { | |
373 | update_solib_breakpoints (); | |
374 | } | |
375 | ||
920d2a44 AC |
376 | static void |
377 | show_stop_on_solib_events (struct ui_file *file, int from_tty, | |
378 | struct cmd_list_element *c, const char *value) | |
379 | { | |
380 | fprintf_filtered (file, _("Stopping for shared library events is %s.\n"), | |
381 | value); | |
382 | } | |
c906108c | 383 | |
c906108c SS |
384 | /* Nonzero after stop if current stack frame should be printed. */ |
385 | ||
386 | static int stop_print_frame; | |
387 | ||
e02bc4cc | 388 | /* This is a cached copy of the pid/waitstatus of the last event |
9a4105ab AC |
389 | returned by target_wait()/deprecated_target_wait_hook(). This |
390 | information is returned by get_last_target_status(). */ | |
39f77062 | 391 | static ptid_t target_last_wait_ptid; |
e02bc4cc DS |
392 | static struct target_waitstatus target_last_waitstatus; |
393 | ||
0d1e5fa7 PA |
394 | static void context_switch (ptid_t ptid); |
395 | ||
4e1c45ea | 396 | void init_thread_stepping_state (struct thread_info *tss); |
0d1e5fa7 | 397 | |
53904c9e AC |
398 | static const char follow_fork_mode_child[] = "child"; |
399 | static const char follow_fork_mode_parent[] = "parent"; | |
400 | ||
40478521 | 401 | static const char *const follow_fork_mode_kind_names[] = { |
53904c9e AC |
402 | follow_fork_mode_child, |
403 | follow_fork_mode_parent, | |
404 | NULL | |
ef346e04 | 405 | }; |
c906108c | 406 | |
53904c9e | 407 | static const char *follow_fork_mode_string = follow_fork_mode_parent; |
920d2a44 AC |
408 | static void |
409 | show_follow_fork_mode_string (struct ui_file *file, int from_tty, | |
410 | struct cmd_list_element *c, const char *value) | |
411 | { | |
3e43a32a MS |
412 | fprintf_filtered (file, |
413 | _("Debugger response to a program " | |
414 | "call of fork or vfork is \"%s\".\n"), | |
920d2a44 AC |
415 | value); |
416 | } | |
c906108c SS |
417 | \f |
418 | ||
d83ad864 DB |
419 | /* Handle changes to the inferior list based on the type of fork, |
420 | which process is being followed, and whether the other process | |
421 | should be detached. On entry inferior_ptid must be the ptid of | |
422 | the fork parent. At return inferior_ptid is the ptid of the | |
423 | followed inferior. */ | |
424 | ||
425 | static int | |
426 | follow_fork_inferior (int follow_child, int detach_fork) | |
427 | { | |
428 | int has_vforked; | |
79639e11 | 429 | ptid_t parent_ptid, child_ptid; |
d83ad864 DB |
430 | |
431 | has_vforked = (inferior_thread ()->pending_follow.kind | |
432 | == TARGET_WAITKIND_VFORKED); | |
79639e11 PA |
433 | parent_ptid = inferior_ptid; |
434 | child_ptid = inferior_thread ()->pending_follow.value.related_pid; | |
d83ad864 DB |
435 | |
436 | if (has_vforked | |
437 | && !non_stop /* Non-stop always resumes both branches. */ | |
3b12939d | 438 | && current_ui->prompt_state == PROMPT_BLOCKED |
d83ad864 DB |
439 | && !(follow_child || detach_fork || sched_multi)) |
440 | { | |
441 | /* The parent stays blocked inside the vfork syscall until the | |
442 | child execs or exits. If we don't let the child run, then | |
443 | the parent stays blocked. If we're telling the parent to run | |
444 | in the foreground, the user will not be able to ctrl-c to get | |
445 | back the terminal, effectively hanging the debug session. */ | |
446 | fprintf_filtered (gdb_stderr, _("\ | |
447 | Can not resume the parent process over vfork in the foreground while\n\ | |
448 | holding the child stopped. Try \"set detach-on-fork\" or \ | |
449 | \"set schedule-multiple\".\n")); | |
450 | /* FIXME output string > 80 columns. */ | |
451 | return 1; | |
452 | } | |
453 | ||
454 | if (!follow_child) | |
455 | { | |
456 | /* Detach new forked process? */ | |
457 | if (detach_fork) | |
458 | { | |
d83ad864 DB |
459 | /* Before detaching from the child, remove all breakpoints |
460 | from it. If we forked, then this has already been taken | |
461 | care of by infrun.c. If we vforked however, any | |
462 | breakpoint inserted in the parent is visible in the | |
463 | child, even those added while stopped in a vfork | |
464 | catchpoint. This will remove the breakpoints from the | |
465 | parent also, but they'll be reinserted below. */ | |
466 | if (has_vforked) | |
467 | { | |
468 | /* Keep breakpoints list in sync. */ | |
469 | remove_breakpoints_pid (ptid_get_pid (inferior_ptid)); | |
470 | } | |
471 | ||
472 | if (info_verbose || debug_infrun) | |
473 | { | |
8dd06f7a DB |
474 | /* Ensure that we have a process ptid. */ |
475 | ptid_t process_ptid = pid_to_ptid (ptid_get_pid (child_ptid)); | |
476 | ||
223ffa71 | 477 | target_terminal::ours_for_output (); |
d83ad864 | 478 | fprintf_filtered (gdb_stdlog, |
79639e11 | 479 | _("Detaching after %s from child %s.\n"), |
6f259a23 | 480 | has_vforked ? "vfork" : "fork", |
8dd06f7a | 481 | target_pid_to_str (process_ptid)); |
d83ad864 DB |
482 | } |
483 | } | |
484 | else | |
485 | { | |
486 | struct inferior *parent_inf, *child_inf; | |
d83ad864 DB |
487 | |
488 | /* Add process to GDB's tables. */ | |
79639e11 | 489 | child_inf = add_inferior (ptid_get_pid (child_ptid)); |
d83ad864 DB |
490 | |
491 | parent_inf = current_inferior (); | |
492 | child_inf->attach_flag = parent_inf->attach_flag; | |
493 | copy_terminal_info (child_inf, parent_inf); | |
494 | child_inf->gdbarch = parent_inf->gdbarch; | |
495 | copy_inferior_target_desc_info (child_inf, parent_inf); | |
496 | ||
5ed8105e | 497 | scoped_restore_current_pspace_and_thread restore_pspace_thread; |
d83ad864 | 498 | |
79639e11 | 499 | inferior_ptid = child_ptid; |
d83ad864 | 500 | add_thread (inferior_ptid); |
2a00d7ce | 501 | set_current_inferior (child_inf); |
d83ad864 DB |
502 | child_inf->symfile_flags = SYMFILE_NO_READ; |
503 | ||
504 | /* If this is a vfork child, then the address-space is | |
505 | shared with the parent. */ | |
506 | if (has_vforked) | |
507 | { | |
508 | child_inf->pspace = parent_inf->pspace; | |
509 | child_inf->aspace = parent_inf->aspace; | |
510 | ||
511 | /* The parent will be frozen until the child is done | |
512 | with the shared region. Keep track of the | |
513 | parent. */ | |
514 | child_inf->vfork_parent = parent_inf; | |
515 | child_inf->pending_detach = 0; | |
516 | parent_inf->vfork_child = child_inf; | |
517 | parent_inf->pending_detach = 0; | |
518 | } | |
519 | else | |
520 | { | |
521 | child_inf->aspace = new_address_space (); | |
522 | child_inf->pspace = add_program_space (child_inf->aspace); | |
523 | child_inf->removable = 1; | |
524 | set_current_program_space (child_inf->pspace); | |
525 | clone_program_space (child_inf->pspace, parent_inf->pspace); | |
526 | ||
527 | /* Let the shared library layer (e.g., solib-svr4) learn | |
528 | about this new process, relocate the cloned exec, pull | |
529 | in shared libraries, and install the solib event | |
530 | breakpoint. If a "cloned-VM" event was propagated | |
531 | better throughout the core, this wouldn't be | |
532 | required. */ | |
533 | solib_create_inferior_hook (0); | |
534 | } | |
d83ad864 DB |
535 | } |
536 | ||
537 | if (has_vforked) | |
538 | { | |
539 | struct inferior *parent_inf; | |
540 | ||
541 | parent_inf = current_inferior (); | |
542 | ||
543 | /* If we detached from the child, then we have to be careful | |
544 | to not insert breakpoints in the parent until the child | |
545 | is done with the shared memory region. However, if we're | |
546 | staying attached to the child, then we can and should | |
547 | insert breakpoints, so that we can debug it. A | |
548 | subsequent child exec or exit is enough to know when does | |
549 | the child stops using the parent's address space. */ | |
550 | parent_inf->waiting_for_vfork_done = detach_fork; | |
551 | parent_inf->pspace->breakpoints_not_allowed = detach_fork; | |
552 | } | |
553 | } | |
554 | else | |
555 | { | |
556 | /* Follow the child. */ | |
557 | struct inferior *parent_inf, *child_inf; | |
558 | struct program_space *parent_pspace; | |
559 | ||
560 | if (info_verbose || debug_infrun) | |
561 | { | |
223ffa71 | 562 | target_terminal::ours_for_output (); |
6f259a23 | 563 | fprintf_filtered (gdb_stdlog, |
79639e11 PA |
564 | _("Attaching after %s %s to child %s.\n"), |
565 | target_pid_to_str (parent_ptid), | |
6f259a23 | 566 | has_vforked ? "vfork" : "fork", |
79639e11 | 567 | target_pid_to_str (child_ptid)); |
d83ad864 DB |
568 | } |
569 | ||
570 | /* Add the new inferior first, so that the target_detach below | |
571 | doesn't unpush the target. */ | |
572 | ||
79639e11 | 573 | child_inf = add_inferior (ptid_get_pid (child_ptid)); |
d83ad864 DB |
574 | |
575 | parent_inf = current_inferior (); | |
576 | child_inf->attach_flag = parent_inf->attach_flag; | |
577 | copy_terminal_info (child_inf, parent_inf); | |
578 | child_inf->gdbarch = parent_inf->gdbarch; | |
579 | copy_inferior_target_desc_info (child_inf, parent_inf); | |
580 | ||
581 | parent_pspace = parent_inf->pspace; | |
582 | ||
583 | /* If we're vforking, we want to hold on to the parent until the | |
584 | child exits or execs. At child exec or exit time we can | |
585 | remove the old breakpoints from the parent and detach or | |
586 | resume debugging it. Otherwise, detach the parent now; we'll | |
587 | want to reuse it's program/address spaces, but we can't set | |
588 | them to the child before removing breakpoints from the | |
589 | parent, otherwise, the breakpoints module could decide to | |
590 | remove breakpoints from the wrong process (since they'd be | |
591 | assigned to the same address space). */ | |
592 | ||
593 | if (has_vforked) | |
594 | { | |
595 | gdb_assert (child_inf->vfork_parent == NULL); | |
596 | gdb_assert (parent_inf->vfork_child == NULL); | |
597 | child_inf->vfork_parent = parent_inf; | |
598 | child_inf->pending_detach = 0; | |
599 | parent_inf->vfork_child = child_inf; | |
600 | parent_inf->pending_detach = detach_fork; | |
601 | parent_inf->waiting_for_vfork_done = 0; | |
602 | } | |
603 | else if (detach_fork) | |
6f259a23 DB |
604 | { |
605 | if (info_verbose || debug_infrun) | |
606 | { | |
8dd06f7a DB |
607 | /* Ensure that we have a process ptid. */ |
608 | ptid_t process_ptid = pid_to_ptid (ptid_get_pid (child_ptid)); | |
609 | ||
223ffa71 | 610 | target_terminal::ours_for_output (); |
6f259a23 DB |
611 | fprintf_filtered (gdb_stdlog, |
612 | _("Detaching after fork from " | |
79639e11 | 613 | "child %s.\n"), |
8dd06f7a | 614 | target_pid_to_str (process_ptid)); |
6f259a23 DB |
615 | } |
616 | ||
617 | target_detach (NULL, 0); | |
618 | } | |
d83ad864 DB |
619 | |
620 | /* Note that the detach above makes PARENT_INF dangling. */ | |
621 | ||
622 | /* Add the child thread to the appropriate lists, and switch to | |
623 | this new thread, before cloning the program space, and | |
624 | informing the solib layer about this new process. */ | |
625 | ||
79639e11 | 626 | inferior_ptid = child_ptid; |
d83ad864 | 627 | add_thread (inferior_ptid); |
2a00d7ce | 628 | set_current_inferior (child_inf); |
d83ad864 DB |
629 | |
630 | /* If this is a vfork child, then the address-space is shared | |
631 | with the parent. If we detached from the parent, then we can | |
632 | reuse the parent's program/address spaces. */ | |
633 | if (has_vforked || detach_fork) | |
634 | { | |
635 | child_inf->pspace = parent_pspace; | |
636 | child_inf->aspace = child_inf->pspace->aspace; | |
637 | } | |
638 | else | |
639 | { | |
640 | child_inf->aspace = new_address_space (); | |
641 | child_inf->pspace = add_program_space (child_inf->aspace); | |
642 | child_inf->removable = 1; | |
643 | child_inf->symfile_flags = SYMFILE_NO_READ; | |
644 | set_current_program_space (child_inf->pspace); | |
645 | clone_program_space (child_inf->pspace, parent_pspace); | |
646 | ||
647 | /* Let the shared library layer (e.g., solib-svr4) learn | |
648 | about this new process, relocate the cloned exec, pull in | |
649 | shared libraries, and install the solib event breakpoint. | |
650 | If a "cloned-VM" event was propagated better throughout | |
651 | the core, this wouldn't be required. */ | |
652 | solib_create_inferior_hook (0); | |
653 | } | |
654 | } | |
655 | ||
656 | return target_follow_fork (follow_child, detach_fork); | |
657 | } | |
658 | ||
e58b0e63 PA |
659 | /* Tell the target to follow the fork we're stopped at. Returns true |
660 | if the inferior should be resumed; false, if the target for some | |
661 | reason decided it's best not to resume. */ | |
662 | ||
6604731b | 663 | static int |
4ef3f3be | 664 | follow_fork (void) |
c906108c | 665 | { |
ea1dd7bc | 666 | int follow_child = (follow_fork_mode_string == follow_fork_mode_child); |
e58b0e63 PA |
667 | int should_resume = 1; |
668 | struct thread_info *tp; | |
669 | ||
670 | /* Copy user stepping state to the new inferior thread. FIXME: the | |
671 | followed fork child thread should have a copy of most of the | |
4e3990f4 DE |
672 | parent thread structure's run control related fields, not just these. |
673 | Initialized to avoid "may be used uninitialized" warnings from gcc. */ | |
674 | struct breakpoint *step_resume_breakpoint = NULL; | |
186c406b | 675 | struct breakpoint *exception_resume_breakpoint = NULL; |
4e3990f4 DE |
676 | CORE_ADDR step_range_start = 0; |
677 | CORE_ADDR step_range_end = 0; | |
678 | struct frame_id step_frame_id = { 0 }; | |
8980e177 | 679 | struct thread_fsm *thread_fsm = NULL; |
e58b0e63 PA |
680 | |
681 | if (!non_stop) | |
682 | { | |
683 | ptid_t wait_ptid; | |
684 | struct target_waitstatus wait_status; | |
685 | ||
686 | /* Get the last target status returned by target_wait(). */ | |
687 | get_last_target_status (&wait_ptid, &wait_status); | |
688 | ||
689 | /* If not stopped at a fork event, then there's nothing else to | |
690 | do. */ | |
691 | if (wait_status.kind != TARGET_WAITKIND_FORKED | |
692 | && wait_status.kind != TARGET_WAITKIND_VFORKED) | |
693 | return 1; | |
694 | ||
695 | /* Check if we switched over from WAIT_PTID, since the event was | |
696 | reported. */ | |
697 | if (!ptid_equal (wait_ptid, minus_one_ptid) | |
698 | && !ptid_equal (inferior_ptid, wait_ptid)) | |
699 | { | |
700 | /* We did. Switch back to WAIT_PTID thread, to tell the | |
701 | target to follow it (in either direction). We'll | |
702 | afterwards refuse to resume, and inform the user what | |
703 | happened. */ | |
704 | switch_to_thread (wait_ptid); | |
705 | should_resume = 0; | |
706 | } | |
707 | } | |
708 | ||
709 | tp = inferior_thread (); | |
710 | ||
711 | /* If there were any forks/vforks that were caught and are now to be | |
712 | followed, then do so now. */ | |
713 | switch (tp->pending_follow.kind) | |
714 | { | |
715 | case TARGET_WAITKIND_FORKED: | |
716 | case TARGET_WAITKIND_VFORKED: | |
717 | { | |
718 | ptid_t parent, child; | |
719 | ||
720 | /* If the user did a next/step, etc, over a fork call, | |
721 | preserve the stepping state in the fork child. */ | |
722 | if (follow_child && should_resume) | |
723 | { | |
8358c15c JK |
724 | step_resume_breakpoint = clone_momentary_breakpoint |
725 | (tp->control.step_resume_breakpoint); | |
16c381f0 JK |
726 | step_range_start = tp->control.step_range_start; |
727 | step_range_end = tp->control.step_range_end; | |
728 | step_frame_id = tp->control.step_frame_id; | |
186c406b TT |
729 | exception_resume_breakpoint |
730 | = clone_momentary_breakpoint (tp->control.exception_resume_breakpoint); | |
8980e177 | 731 | thread_fsm = tp->thread_fsm; |
e58b0e63 PA |
732 | |
733 | /* For now, delete the parent's sr breakpoint, otherwise, | |
734 | parent/child sr breakpoints are considered duplicates, | |
735 | and the child version will not be installed. Remove | |
736 | this when the breakpoints module becomes aware of | |
737 | inferiors and address spaces. */ | |
738 | delete_step_resume_breakpoint (tp); | |
16c381f0 JK |
739 | tp->control.step_range_start = 0; |
740 | tp->control.step_range_end = 0; | |
741 | tp->control.step_frame_id = null_frame_id; | |
186c406b | 742 | delete_exception_resume_breakpoint (tp); |
8980e177 | 743 | tp->thread_fsm = NULL; |
e58b0e63 PA |
744 | } |
745 | ||
746 | parent = inferior_ptid; | |
747 | child = tp->pending_follow.value.related_pid; | |
748 | ||
d83ad864 DB |
749 | /* Set up inferior(s) as specified by the caller, and tell the |
750 | target to do whatever is necessary to follow either parent | |
751 | or child. */ | |
752 | if (follow_fork_inferior (follow_child, detach_fork)) | |
e58b0e63 PA |
753 | { |
754 | /* Target refused to follow, or there's some other reason | |
755 | we shouldn't resume. */ | |
756 | should_resume = 0; | |
757 | } | |
758 | else | |
759 | { | |
760 | /* This pending follow fork event is now handled, one way | |
761 | or another. The previous selected thread may be gone | |
762 | from the lists by now, but if it is still around, need | |
763 | to clear the pending follow request. */ | |
e09875d4 | 764 | tp = find_thread_ptid (parent); |
e58b0e63 PA |
765 | if (tp) |
766 | tp->pending_follow.kind = TARGET_WAITKIND_SPURIOUS; | |
767 | ||
768 | /* This makes sure we don't try to apply the "Switched | |
769 | over from WAIT_PID" logic above. */ | |
770 | nullify_last_target_wait_ptid (); | |
771 | ||
1777feb0 | 772 | /* If we followed the child, switch to it... */ |
e58b0e63 PA |
773 | if (follow_child) |
774 | { | |
775 | switch_to_thread (child); | |
776 | ||
777 | /* ... and preserve the stepping state, in case the | |
778 | user was stepping over the fork call. */ | |
779 | if (should_resume) | |
780 | { | |
781 | tp = inferior_thread (); | |
8358c15c JK |
782 | tp->control.step_resume_breakpoint |
783 | = step_resume_breakpoint; | |
16c381f0 JK |
784 | tp->control.step_range_start = step_range_start; |
785 | tp->control.step_range_end = step_range_end; | |
786 | tp->control.step_frame_id = step_frame_id; | |
186c406b TT |
787 | tp->control.exception_resume_breakpoint |
788 | = exception_resume_breakpoint; | |
8980e177 | 789 | tp->thread_fsm = thread_fsm; |
e58b0e63 PA |
790 | } |
791 | else | |
792 | { | |
793 | /* If we get here, it was because we're trying to | |
794 | resume from a fork catchpoint, but, the user | |
795 | has switched threads away from the thread that | |
796 | forked. In that case, the resume command | |
797 | issued is most likely not applicable to the | |
798 | child, so just warn, and refuse to resume. */ | |
3e43a32a | 799 | warning (_("Not resuming: switched threads " |
fd7dcb94 | 800 | "before following fork child.")); |
e58b0e63 PA |
801 | } |
802 | ||
803 | /* Reset breakpoints in the child as appropriate. */ | |
804 | follow_inferior_reset_breakpoints (); | |
805 | } | |
806 | else | |
807 | switch_to_thread (parent); | |
808 | } | |
809 | } | |
810 | break; | |
811 | case TARGET_WAITKIND_SPURIOUS: | |
812 | /* Nothing to follow. */ | |
813 | break; | |
814 | default: | |
815 | internal_error (__FILE__, __LINE__, | |
816 | "Unexpected pending_follow.kind %d\n", | |
817 | tp->pending_follow.kind); | |
818 | break; | |
819 | } | |
c906108c | 820 | |
e58b0e63 | 821 | return should_resume; |
c906108c SS |
822 | } |
823 | ||
d83ad864 | 824 | static void |
6604731b | 825 | follow_inferior_reset_breakpoints (void) |
c906108c | 826 | { |
4e1c45ea PA |
827 | struct thread_info *tp = inferior_thread (); |
828 | ||
6604731b DJ |
829 | /* Was there a step_resume breakpoint? (There was if the user |
830 | did a "next" at the fork() call.) If so, explicitly reset its | |
a1aa2221 LM |
831 | thread number. Cloned step_resume breakpoints are disabled on |
832 | creation, so enable it here now that it is associated with the | |
833 | correct thread. | |
6604731b DJ |
834 | |
835 | step_resumes are a form of bp that are made to be per-thread. | |
836 | Since we created the step_resume bp when the parent process | |
837 | was being debugged, and now are switching to the child process, | |
838 | from the breakpoint package's viewpoint, that's a switch of | |
839 | "threads". We must update the bp's notion of which thread | |
840 | it is for, or it'll be ignored when it triggers. */ | |
841 | ||
8358c15c | 842 | if (tp->control.step_resume_breakpoint) |
a1aa2221 LM |
843 | { |
844 | breakpoint_re_set_thread (tp->control.step_resume_breakpoint); | |
845 | tp->control.step_resume_breakpoint->loc->enabled = 1; | |
846 | } | |
6604731b | 847 | |
a1aa2221 | 848 | /* Treat exception_resume breakpoints like step_resume breakpoints. */ |
186c406b | 849 | if (tp->control.exception_resume_breakpoint) |
a1aa2221 LM |
850 | { |
851 | breakpoint_re_set_thread (tp->control.exception_resume_breakpoint); | |
852 | tp->control.exception_resume_breakpoint->loc->enabled = 1; | |
853 | } | |
186c406b | 854 | |
6604731b DJ |
855 | /* Reinsert all breakpoints in the child. The user may have set |
856 | breakpoints after catching the fork, in which case those | |
857 | were never set in the child, but only in the parent. This makes | |
858 | sure the inserted breakpoints match the breakpoint list. */ | |
859 | ||
860 | breakpoint_re_set (); | |
861 | insert_breakpoints (); | |
c906108c | 862 | } |
c906108c | 863 | |
6c95b8df PA |
864 | /* The child has exited or execed: resume threads of the parent the |
865 | user wanted to be executing. */ | |
866 | ||
867 | static int | |
868 | proceed_after_vfork_done (struct thread_info *thread, | |
869 | void *arg) | |
870 | { | |
871 | int pid = * (int *) arg; | |
872 | ||
873 | if (ptid_get_pid (thread->ptid) == pid | |
874 | && is_running (thread->ptid) | |
875 | && !is_executing (thread->ptid) | |
876 | && !thread->stop_requested | |
a493e3e2 | 877 | && thread->suspend.stop_signal == GDB_SIGNAL_0) |
6c95b8df PA |
878 | { |
879 | if (debug_infrun) | |
880 | fprintf_unfiltered (gdb_stdlog, | |
881 | "infrun: resuming vfork parent thread %s\n", | |
882 | target_pid_to_str (thread->ptid)); | |
883 | ||
884 | switch_to_thread (thread->ptid); | |
70509625 | 885 | clear_proceed_status (0); |
64ce06e4 | 886 | proceed ((CORE_ADDR) -1, GDB_SIGNAL_DEFAULT); |
6c95b8df PA |
887 | } |
888 | ||
889 | return 0; | |
890 | } | |
891 | ||
5ed8105e PA |
892 | /* Save/restore inferior_ptid, current program space and current |
893 | inferior. Only use this if the current context points at an exited | |
894 | inferior (and therefore there's no current thread to save). */ | |
895 | class scoped_restore_exited_inferior | |
896 | { | |
897 | public: | |
898 | scoped_restore_exited_inferior () | |
899 | : m_saved_ptid (&inferior_ptid) | |
900 | {} | |
901 | ||
902 | private: | |
903 | scoped_restore_tmpl<ptid_t> m_saved_ptid; | |
904 | scoped_restore_current_program_space m_pspace; | |
905 | scoped_restore_current_inferior m_inferior; | |
906 | }; | |
907 | ||
6c95b8df PA |
908 | /* Called whenever we notice an exec or exit event, to handle |
909 | detaching or resuming a vfork parent. */ | |
910 | ||
911 | static void | |
912 | handle_vfork_child_exec_or_exit (int exec) | |
913 | { | |
914 | struct inferior *inf = current_inferior (); | |
915 | ||
916 | if (inf->vfork_parent) | |
917 | { | |
918 | int resume_parent = -1; | |
919 | ||
920 | /* This exec or exit marks the end of the shared memory region | |
921 | between the parent and the child. If the user wanted to | |
922 | detach from the parent, now is the time. */ | |
923 | ||
924 | if (inf->vfork_parent->pending_detach) | |
925 | { | |
926 | struct thread_info *tp; | |
6c95b8df PA |
927 | struct program_space *pspace; |
928 | struct address_space *aspace; | |
929 | ||
1777feb0 | 930 | /* follow-fork child, detach-on-fork on. */ |
6c95b8df | 931 | |
68c9da30 PA |
932 | inf->vfork_parent->pending_detach = 0; |
933 | ||
5ed8105e PA |
934 | gdb::optional<scoped_restore_exited_inferior> |
935 | maybe_restore_inferior; | |
936 | gdb::optional<scoped_restore_current_pspace_and_thread> | |
937 | maybe_restore_thread; | |
938 | ||
939 | /* If we're handling a child exit, then inferior_ptid points | |
940 | at the inferior's pid, not to a thread. */ | |
f50f4e56 | 941 | if (!exec) |
5ed8105e | 942 | maybe_restore_inferior.emplace (); |
f50f4e56 | 943 | else |
5ed8105e | 944 | maybe_restore_thread.emplace (); |
6c95b8df PA |
945 | |
946 | /* We're letting loose of the parent. */ | |
947 | tp = any_live_thread_of_process (inf->vfork_parent->pid); | |
948 | switch_to_thread (tp->ptid); | |
949 | ||
950 | /* We're about to detach from the parent, which implicitly | |
951 | removes breakpoints from its address space. There's a | |
952 | catch here: we want to reuse the spaces for the child, | |
953 | but, parent/child are still sharing the pspace at this | |
954 | point, although the exec in reality makes the kernel give | |
955 | the child a fresh set of new pages. The problem here is | |
956 | that the breakpoints module being unaware of this, would | |
957 | likely chose the child process to write to the parent | |
958 | address space. Swapping the child temporarily away from | |
959 | the spaces has the desired effect. Yes, this is "sort | |
960 | of" a hack. */ | |
961 | ||
962 | pspace = inf->pspace; | |
963 | aspace = inf->aspace; | |
964 | inf->aspace = NULL; | |
965 | inf->pspace = NULL; | |
966 | ||
967 | if (debug_infrun || info_verbose) | |
968 | { | |
223ffa71 | 969 | target_terminal::ours_for_output (); |
6c95b8df PA |
970 | |
971 | if (exec) | |
6f259a23 DB |
972 | { |
973 | fprintf_filtered (gdb_stdlog, | |
974 | _("Detaching vfork parent process " | |
975 | "%d after child exec.\n"), | |
976 | inf->vfork_parent->pid); | |
977 | } | |
6c95b8df | 978 | else |
6f259a23 DB |
979 | { |
980 | fprintf_filtered (gdb_stdlog, | |
981 | _("Detaching vfork parent process " | |
982 | "%d after child exit.\n"), | |
983 | inf->vfork_parent->pid); | |
984 | } | |
6c95b8df PA |
985 | } |
986 | ||
987 | target_detach (NULL, 0); | |
988 | ||
989 | /* Put it back. */ | |
990 | inf->pspace = pspace; | |
991 | inf->aspace = aspace; | |
6c95b8df PA |
992 | } |
993 | else if (exec) | |
994 | { | |
995 | /* We're staying attached to the parent, so, really give the | |
996 | child a new address space. */ | |
997 | inf->pspace = add_program_space (maybe_new_address_space ()); | |
998 | inf->aspace = inf->pspace->aspace; | |
999 | inf->removable = 1; | |
1000 | set_current_program_space (inf->pspace); | |
1001 | ||
1002 | resume_parent = inf->vfork_parent->pid; | |
1003 | ||
1004 | /* Break the bonds. */ | |
1005 | inf->vfork_parent->vfork_child = NULL; | |
1006 | } | |
1007 | else | |
1008 | { | |
6c95b8df PA |
1009 | struct program_space *pspace; |
1010 | ||
1011 | /* If this is a vfork child exiting, then the pspace and | |
1012 | aspaces were shared with the parent. Since we're | |
1013 | reporting the process exit, we'll be mourning all that is | |
1014 | found in the address space, and switching to null_ptid, | |
1015 | preparing to start a new inferior. But, since we don't | |
1016 | want to clobber the parent's address/program spaces, we | |
1017 | go ahead and create a new one for this exiting | |
1018 | inferior. */ | |
1019 | ||
5ed8105e PA |
1020 | /* Switch to null_ptid while running clone_program_space, so |
1021 | that clone_program_space doesn't want to read the | |
1022 | selected frame of a dead process. */ | |
1023 | scoped_restore restore_ptid | |
1024 | = make_scoped_restore (&inferior_ptid, null_ptid); | |
6c95b8df PA |
1025 | |
1026 | /* This inferior is dead, so avoid giving the breakpoints | |
1027 | module the option to write through to it (cloning a | |
1028 | program space resets breakpoints). */ | |
1029 | inf->aspace = NULL; | |
1030 | inf->pspace = NULL; | |
1031 | pspace = add_program_space (maybe_new_address_space ()); | |
1032 | set_current_program_space (pspace); | |
1033 | inf->removable = 1; | |
7dcd53a0 | 1034 | inf->symfile_flags = SYMFILE_NO_READ; |
6c95b8df PA |
1035 | clone_program_space (pspace, inf->vfork_parent->pspace); |
1036 | inf->pspace = pspace; | |
1037 | inf->aspace = pspace->aspace; | |
1038 | ||
6c95b8df PA |
1039 | resume_parent = inf->vfork_parent->pid; |
1040 | /* Break the bonds. */ | |
1041 | inf->vfork_parent->vfork_child = NULL; | |
1042 | } | |
1043 | ||
1044 | inf->vfork_parent = NULL; | |
1045 | ||
1046 | gdb_assert (current_program_space == inf->pspace); | |
1047 | ||
1048 | if (non_stop && resume_parent != -1) | |
1049 | { | |
1050 | /* If the user wanted the parent to be running, let it go | |
1051 | free now. */ | |
5ed8105e | 1052 | scoped_restore_current_thread restore_thread; |
6c95b8df PA |
1053 | |
1054 | if (debug_infrun) | |
3e43a32a MS |
1055 | fprintf_unfiltered (gdb_stdlog, |
1056 | "infrun: resuming vfork parent process %d\n", | |
6c95b8df PA |
1057 | resume_parent); |
1058 | ||
1059 | iterate_over_threads (proceed_after_vfork_done, &resume_parent); | |
6c95b8df PA |
1060 | } |
1061 | } | |
1062 | } | |
1063 | ||
eb6c553b | 1064 | /* Enum strings for "set|show follow-exec-mode". */ |
6c95b8df PA |
1065 | |
1066 | static const char follow_exec_mode_new[] = "new"; | |
1067 | static const char follow_exec_mode_same[] = "same"; | |
40478521 | 1068 | static const char *const follow_exec_mode_names[] = |
6c95b8df PA |
1069 | { |
1070 | follow_exec_mode_new, | |
1071 | follow_exec_mode_same, | |
1072 | NULL, | |
1073 | }; | |
1074 | ||
1075 | static const char *follow_exec_mode_string = follow_exec_mode_same; | |
1076 | static void | |
1077 | show_follow_exec_mode_string (struct ui_file *file, int from_tty, | |
1078 | struct cmd_list_element *c, const char *value) | |
1079 | { | |
1080 | fprintf_filtered (file, _("Follow exec mode is \"%s\".\n"), value); | |
1081 | } | |
1082 | ||
ecf45d2c | 1083 | /* EXEC_FILE_TARGET is assumed to be non-NULL. */ |
1adeb98a | 1084 | |
c906108c | 1085 | static void |
ecf45d2c | 1086 | follow_exec (ptid_t ptid, char *exec_file_target) |
c906108c | 1087 | { |
95e50b27 | 1088 | struct thread_info *th, *tmp; |
6c95b8df | 1089 | struct inferior *inf = current_inferior (); |
95e50b27 | 1090 | int pid = ptid_get_pid (ptid); |
94585166 | 1091 | ptid_t process_ptid; |
ecf45d2c SL |
1092 | char *exec_file_host; |
1093 | struct cleanup *old_chain; | |
7a292a7a | 1094 | |
c906108c SS |
1095 | /* This is an exec event that we actually wish to pay attention to. |
1096 | Refresh our symbol table to the newly exec'd program, remove any | |
1097 | momentary bp's, etc. | |
1098 | ||
1099 | If there are breakpoints, they aren't really inserted now, | |
1100 | since the exec() transformed our inferior into a fresh set | |
1101 | of instructions. | |
1102 | ||
1103 | We want to preserve symbolic breakpoints on the list, since | |
1104 | we have hopes that they can be reset after the new a.out's | |
1105 | symbol table is read. | |
1106 | ||
1107 | However, any "raw" breakpoints must be removed from the list | |
1108 | (e.g., the solib bp's), since their address is probably invalid | |
1109 | now. | |
1110 | ||
1111 | And, we DON'T want to call delete_breakpoints() here, since | |
1112 | that may write the bp's "shadow contents" (the instruction | |
1113 | value that was overwritten witha TRAP instruction). Since | |
1777feb0 | 1114 | we now have a new a.out, those shadow contents aren't valid. */ |
6c95b8df PA |
1115 | |
1116 | mark_breakpoints_out (); | |
1117 | ||
95e50b27 PA |
1118 | /* The target reports the exec event to the main thread, even if |
1119 | some other thread does the exec, and even if the main thread was | |
1120 | stopped or already gone. We may still have non-leader threads of | |
1121 | the process on our list. E.g., on targets that don't have thread | |
1122 | exit events (like remote); or on native Linux in non-stop mode if | |
1123 | there were only two threads in the inferior and the non-leader | |
1124 | one is the one that execs (and nothing forces an update of the | |
1125 | thread list up to here). When debugging remotely, it's best to | |
1126 | avoid extra traffic, when possible, so avoid syncing the thread | |
1127 | list with the target, and instead go ahead and delete all threads | |
1128 | of the process but one that reported the event. Note this must | |
1129 | be done before calling update_breakpoints_after_exec, as | |
1130 | otherwise clearing the threads' resources would reference stale | |
1131 | thread breakpoints -- it may have been one of these threads that | |
1132 | stepped across the exec. We could just clear their stepping | |
1133 | states, but as long as we're iterating, might as well delete | |
1134 | them. Deleting them now rather than at the next user-visible | |
1135 | stop provides a nicer sequence of events for user and MI | |
1136 | notifications. */ | |
8a06aea7 | 1137 | ALL_THREADS_SAFE (th, tmp) |
95e50b27 PA |
1138 | if (ptid_get_pid (th->ptid) == pid && !ptid_equal (th->ptid, ptid)) |
1139 | delete_thread (th->ptid); | |
1140 | ||
1141 | /* We also need to clear any left over stale state for the | |
1142 | leader/event thread. E.g., if there was any step-resume | |
1143 | breakpoint or similar, it's gone now. We cannot truly | |
1144 | step-to-next statement through an exec(). */ | |
1145 | th = inferior_thread (); | |
8358c15c | 1146 | th->control.step_resume_breakpoint = NULL; |
186c406b | 1147 | th->control.exception_resume_breakpoint = NULL; |
34b7e8a6 | 1148 | th->control.single_step_breakpoints = NULL; |
16c381f0 JK |
1149 | th->control.step_range_start = 0; |
1150 | th->control.step_range_end = 0; | |
c906108c | 1151 | |
95e50b27 PA |
1152 | /* The user may have had the main thread held stopped in the |
1153 | previous image (e.g., schedlock on, or non-stop). Release | |
1154 | it now. */ | |
a75724bc PA |
1155 | th->stop_requested = 0; |
1156 | ||
95e50b27 PA |
1157 | update_breakpoints_after_exec (); |
1158 | ||
1777feb0 | 1159 | /* What is this a.out's name? */ |
94585166 | 1160 | process_ptid = pid_to_ptid (pid); |
6c95b8df | 1161 | printf_unfiltered (_("%s is executing new program: %s\n"), |
94585166 | 1162 | target_pid_to_str (process_ptid), |
ecf45d2c | 1163 | exec_file_target); |
c906108c SS |
1164 | |
1165 | /* We've followed the inferior through an exec. Therefore, the | |
1777feb0 | 1166 | inferior has essentially been killed & reborn. */ |
7a292a7a | 1167 | |
c906108c | 1168 | gdb_flush (gdb_stdout); |
6ca15a4b PA |
1169 | |
1170 | breakpoint_init_inferior (inf_execd); | |
e85a822c | 1171 | |
ecf45d2c SL |
1172 | exec_file_host = exec_file_find (exec_file_target, NULL); |
1173 | old_chain = make_cleanup (xfree, exec_file_host); | |
ff862be4 | 1174 | |
ecf45d2c SL |
1175 | /* If we were unable to map the executable target pathname onto a host |
1176 | pathname, tell the user that. Otherwise GDB's subsequent behavior | |
1177 | is confusing. Maybe it would even be better to stop at this point | |
1178 | so that the user can specify a file manually before continuing. */ | |
1179 | if (exec_file_host == NULL) | |
1180 | warning (_("Could not load symbols for executable %s.\n" | |
1181 | "Do you need \"set sysroot\"?"), | |
1182 | exec_file_target); | |
c906108c | 1183 | |
cce9b6bf PA |
1184 | /* Reset the shared library package. This ensures that we get a |
1185 | shlib event when the child reaches "_start", at which point the | |
1186 | dld will have had a chance to initialize the child. */ | |
1187 | /* Also, loading a symbol file below may trigger symbol lookups, and | |
1188 | we don't want those to be satisfied by the libraries of the | |
1189 | previous incarnation of this process. */ | |
1190 | no_shared_libraries (NULL, 0); | |
1191 | ||
6c95b8df PA |
1192 | if (follow_exec_mode_string == follow_exec_mode_new) |
1193 | { | |
6c95b8df PA |
1194 | /* The user wants to keep the old inferior and program spaces |
1195 | around. Create a new fresh one, and switch to it. */ | |
1196 | ||
17d8546e DB |
1197 | /* Do exit processing for the original inferior before adding |
1198 | the new inferior so we don't have two active inferiors with | |
1199 | the same ptid, which can confuse find_inferior_ptid. */ | |
1200 | exit_inferior_num_silent (current_inferior ()->num); | |
1201 | ||
94585166 DB |
1202 | inf = add_inferior_with_spaces (); |
1203 | inf->pid = pid; | |
ecf45d2c | 1204 | target_follow_exec (inf, exec_file_target); |
6c95b8df PA |
1205 | |
1206 | set_current_inferior (inf); | |
94585166 | 1207 | set_current_program_space (inf->pspace); |
6c95b8df | 1208 | } |
9107fc8d PA |
1209 | else |
1210 | { | |
1211 | /* The old description may no longer be fit for the new image. | |
1212 | E.g, a 64-bit process exec'ed a 32-bit process. Clear the | |
1213 | old description; we'll read a new one below. No need to do | |
1214 | this on "follow-exec-mode new", as the old inferior stays | |
1215 | around (its description is later cleared/refetched on | |
1216 | restart). */ | |
1217 | target_clear_description (); | |
1218 | } | |
6c95b8df PA |
1219 | |
1220 | gdb_assert (current_program_space == inf->pspace); | |
1221 | ||
ecf45d2c SL |
1222 | /* Attempt to open the exec file. SYMFILE_DEFER_BP_RESET is used |
1223 | because the proper displacement for a PIE (Position Independent | |
1224 | Executable) main symbol file will only be computed by | |
1225 | solib_create_inferior_hook below. breakpoint_re_set would fail | |
1226 | to insert the breakpoints with the zero displacement. */ | |
1227 | try_open_exec_file (exec_file_host, inf, SYMFILE_DEFER_BP_RESET); | |
c1e56572 | 1228 | |
ecf45d2c | 1229 | do_cleanups (old_chain); |
c906108c | 1230 | |
9107fc8d PA |
1231 | /* If the target can specify a description, read it. Must do this |
1232 | after flipping to the new executable (because the target supplied | |
1233 | description must be compatible with the executable's | |
1234 | architecture, and the old executable may e.g., be 32-bit, while | |
1235 | the new one 64-bit), and before anything involving memory or | |
1236 | registers. */ | |
1237 | target_find_description (); | |
1238 | ||
bf93d7ba SM |
1239 | /* The add_thread call ends up reading registers, so do it after updating the |
1240 | target description. */ | |
1241 | if (follow_exec_mode_string == follow_exec_mode_new) | |
1242 | add_thread (ptid); | |
1243 | ||
268a4a75 | 1244 | solib_create_inferior_hook (0); |
c906108c | 1245 | |
4efc6507 DE |
1246 | jit_inferior_created_hook (); |
1247 | ||
c1e56572 JK |
1248 | breakpoint_re_set (); |
1249 | ||
c906108c SS |
1250 | /* Reinsert all breakpoints. (Those which were symbolic have |
1251 | been reset to the proper address in the new a.out, thanks | |
1777feb0 | 1252 | to symbol_file_command...). */ |
c906108c SS |
1253 | insert_breakpoints (); |
1254 | ||
1255 | /* The next resume of this inferior should bring it to the shlib | |
1256 | startup breakpoints. (If the user had also set bp's on | |
1257 | "main" from the old (parent) process, then they'll auto- | |
1777feb0 | 1258 | matically get reset there in the new process.). */ |
c906108c SS |
1259 | } |
1260 | ||
c2829269 PA |
1261 | /* The queue of threads that need to do a step-over operation to get |
1262 | past e.g., a breakpoint. What technique is used to step over the | |
1263 | breakpoint/watchpoint does not matter -- all threads end up in the | |
1264 | same queue, to maintain rough temporal order of execution, in order | |
1265 | to avoid starvation, otherwise, we could e.g., find ourselves | |
1266 | constantly stepping the same couple threads past their breakpoints | |
1267 | over and over, if the single-step finish fast enough. */ | |
1268 | struct thread_info *step_over_queue_head; | |
1269 | ||
6c4cfb24 PA |
1270 | /* Bit flags indicating what the thread needs to step over. */ |
1271 | ||
8d297bbf | 1272 | enum step_over_what_flag |
6c4cfb24 PA |
1273 | { |
1274 | /* Step over a breakpoint. */ | |
1275 | STEP_OVER_BREAKPOINT = 1, | |
1276 | ||
1277 | /* Step past a non-continuable watchpoint, in order to let the | |
1278 | instruction execute so we can evaluate the watchpoint | |
1279 | expression. */ | |
1280 | STEP_OVER_WATCHPOINT = 2 | |
1281 | }; | |
8d297bbf | 1282 | DEF_ENUM_FLAGS_TYPE (enum step_over_what_flag, step_over_what); |
6c4cfb24 | 1283 | |
963f9c80 | 1284 | /* Info about an instruction that is being stepped over. */ |
31e77af2 PA |
1285 | |
1286 | struct step_over_info | |
1287 | { | |
963f9c80 PA |
1288 | /* If we're stepping past a breakpoint, this is the address space |
1289 | and address of the instruction the breakpoint is set at. We'll | |
1290 | skip inserting all breakpoints here. Valid iff ASPACE is | |
1291 | non-NULL. */ | |
31e77af2 | 1292 | struct address_space *aspace; |
31e77af2 | 1293 | CORE_ADDR address; |
963f9c80 PA |
1294 | |
1295 | /* The instruction being stepped over triggers a nonsteppable | |
1296 | watchpoint. If true, we'll skip inserting watchpoints. */ | |
1297 | int nonsteppable_watchpoint_p; | |
21edc42f YQ |
1298 | |
1299 | /* The thread's global number. */ | |
1300 | int thread; | |
31e77af2 PA |
1301 | }; |
1302 | ||
1303 | /* The step-over info of the location that is being stepped over. | |
1304 | ||
1305 | Note that with async/breakpoint always-inserted mode, a user might | |
1306 | set a new breakpoint/watchpoint/etc. exactly while a breakpoint is | |
1307 | being stepped over. As setting a new breakpoint inserts all | |
1308 | breakpoints, we need to make sure the breakpoint being stepped over | |
1309 | isn't inserted then. We do that by only clearing the step-over | |
1310 | info when the step-over is actually finished (or aborted). | |
1311 | ||
1312 | Presently GDB can only step over one breakpoint at any given time. | |
1313 | Given threads that can't run code in the same address space as the | |
1314 | breakpoint's can't really miss the breakpoint, GDB could be taught | |
1315 | to step-over at most one breakpoint per address space (so this info | |
1316 | could move to the address space object if/when GDB is extended). | |
1317 | The set of breakpoints being stepped over will normally be much | |
1318 | smaller than the set of all breakpoints, so a flag in the | |
1319 | breakpoint location structure would be wasteful. A separate list | |
1320 | also saves complexity and run-time, as otherwise we'd have to go | |
1321 | through all breakpoint locations clearing their flag whenever we | |
1322 | start a new sequence. Similar considerations weigh against storing | |
1323 | this info in the thread object. Plus, not all step overs actually | |
1324 | have breakpoint locations -- e.g., stepping past a single-step | |
1325 | breakpoint, or stepping to complete a non-continuable | |
1326 | watchpoint. */ | |
1327 | static struct step_over_info step_over_info; | |
1328 | ||
1329 | /* Record the address of the breakpoint/instruction we're currently | |
ce0db137 DE |
1330 | stepping over. |
1331 | N.B. We record the aspace and address now, instead of say just the thread, | |
1332 | because when we need the info later the thread may be running. */ | |
31e77af2 PA |
1333 | |
1334 | static void | |
963f9c80 | 1335 | set_step_over_info (struct address_space *aspace, CORE_ADDR address, |
21edc42f YQ |
1336 | int nonsteppable_watchpoint_p, |
1337 | int thread) | |
31e77af2 PA |
1338 | { |
1339 | step_over_info.aspace = aspace; | |
1340 | step_over_info.address = address; | |
963f9c80 | 1341 | step_over_info.nonsteppable_watchpoint_p = nonsteppable_watchpoint_p; |
21edc42f | 1342 | step_over_info.thread = thread; |
31e77af2 PA |
1343 | } |
1344 | ||
1345 | /* Called when we're not longer stepping over a breakpoint / an | |
1346 | instruction, so all breakpoints are free to be (re)inserted. */ | |
1347 | ||
1348 | static void | |
1349 | clear_step_over_info (void) | |
1350 | { | |
372316f1 PA |
1351 | if (debug_infrun) |
1352 | fprintf_unfiltered (gdb_stdlog, | |
1353 | "infrun: clear_step_over_info\n"); | |
31e77af2 PA |
1354 | step_over_info.aspace = NULL; |
1355 | step_over_info.address = 0; | |
963f9c80 | 1356 | step_over_info.nonsteppable_watchpoint_p = 0; |
21edc42f | 1357 | step_over_info.thread = -1; |
31e77af2 PA |
1358 | } |
1359 | ||
7f89fd65 | 1360 | /* See infrun.h. */ |
31e77af2 PA |
1361 | |
1362 | int | |
1363 | stepping_past_instruction_at (struct address_space *aspace, | |
1364 | CORE_ADDR address) | |
1365 | { | |
1366 | return (step_over_info.aspace != NULL | |
1367 | && breakpoint_address_match (aspace, address, | |
1368 | step_over_info.aspace, | |
1369 | step_over_info.address)); | |
1370 | } | |
1371 | ||
963f9c80 PA |
1372 | /* See infrun.h. */ |
1373 | ||
21edc42f YQ |
1374 | int |
1375 | thread_is_stepping_over_breakpoint (int thread) | |
1376 | { | |
1377 | return (step_over_info.thread != -1 | |
1378 | && thread == step_over_info.thread); | |
1379 | } | |
1380 | ||
1381 | /* See infrun.h. */ | |
1382 | ||
963f9c80 PA |
1383 | int |
1384 | stepping_past_nonsteppable_watchpoint (void) | |
1385 | { | |
1386 | return step_over_info.nonsteppable_watchpoint_p; | |
1387 | } | |
1388 | ||
6cc83d2a PA |
1389 | /* Returns true if step-over info is valid. */ |
1390 | ||
1391 | static int | |
1392 | step_over_info_valid_p (void) | |
1393 | { | |
963f9c80 PA |
1394 | return (step_over_info.aspace != NULL |
1395 | || stepping_past_nonsteppable_watchpoint ()); | |
6cc83d2a PA |
1396 | } |
1397 | ||
c906108c | 1398 | \f |
237fc4c9 PA |
1399 | /* Displaced stepping. */ |
1400 | ||
1401 | /* In non-stop debugging mode, we must take special care to manage | |
1402 | breakpoints properly; in particular, the traditional strategy for | |
1403 | stepping a thread past a breakpoint it has hit is unsuitable. | |
1404 | 'Displaced stepping' is a tactic for stepping one thread past a | |
1405 | breakpoint it has hit while ensuring that other threads running | |
1406 | concurrently will hit the breakpoint as they should. | |
1407 | ||
1408 | The traditional way to step a thread T off a breakpoint in a | |
1409 | multi-threaded program in all-stop mode is as follows: | |
1410 | ||
1411 | a0) Initially, all threads are stopped, and breakpoints are not | |
1412 | inserted. | |
1413 | a1) We single-step T, leaving breakpoints uninserted. | |
1414 | a2) We insert breakpoints, and resume all threads. | |
1415 | ||
1416 | In non-stop debugging, however, this strategy is unsuitable: we | |
1417 | don't want to have to stop all threads in the system in order to | |
1418 | continue or step T past a breakpoint. Instead, we use displaced | |
1419 | stepping: | |
1420 | ||
1421 | n0) Initially, T is stopped, other threads are running, and | |
1422 | breakpoints are inserted. | |
1423 | n1) We copy the instruction "under" the breakpoint to a separate | |
1424 | location, outside the main code stream, making any adjustments | |
1425 | to the instruction, register, and memory state as directed by | |
1426 | T's architecture. | |
1427 | n2) We single-step T over the instruction at its new location. | |
1428 | n3) We adjust the resulting register and memory state as directed | |
1429 | by T's architecture. This includes resetting T's PC to point | |
1430 | back into the main instruction stream. | |
1431 | n4) We resume T. | |
1432 | ||
1433 | This approach depends on the following gdbarch methods: | |
1434 | ||
1435 | - gdbarch_max_insn_length and gdbarch_displaced_step_location | |
1436 | indicate where to copy the instruction, and how much space must | |
1437 | be reserved there. We use these in step n1. | |
1438 | ||
1439 | - gdbarch_displaced_step_copy_insn copies a instruction to a new | |
1440 | address, and makes any necessary adjustments to the instruction, | |
1441 | register contents, and memory. We use this in step n1. | |
1442 | ||
1443 | - gdbarch_displaced_step_fixup adjusts registers and memory after | |
1444 | we have successfuly single-stepped the instruction, to yield the | |
1445 | same effect the instruction would have had if we had executed it | |
1446 | at its original address. We use this in step n3. | |
1447 | ||
1448 | - gdbarch_displaced_step_free_closure provides cleanup. | |
1449 | ||
1450 | The gdbarch_displaced_step_copy_insn and | |
1451 | gdbarch_displaced_step_fixup functions must be written so that | |
1452 | copying an instruction with gdbarch_displaced_step_copy_insn, | |
1453 | single-stepping across the copied instruction, and then applying | |
1454 | gdbarch_displaced_insn_fixup should have the same effects on the | |
1455 | thread's memory and registers as stepping the instruction in place | |
1456 | would have. Exactly which responsibilities fall to the copy and | |
1457 | which fall to the fixup is up to the author of those functions. | |
1458 | ||
1459 | See the comments in gdbarch.sh for details. | |
1460 | ||
1461 | Note that displaced stepping and software single-step cannot | |
1462 | currently be used in combination, although with some care I think | |
1463 | they could be made to. Software single-step works by placing | |
1464 | breakpoints on all possible subsequent instructions; if the | |
1465 | displaced instruction is a PC-relative jump, those breakpoints | |
1466 | could fall in very strange places --- on pages that aren't | |
1467 | executable, or at addresses that are not proper instruction | |
1468 | boundaries. (We do generally let other threads run while we wait | |
1469 | to hit the software single-step breakpoint, and they might | |
1470 | encounter such a corrupted instruction.) One way to work around | |
1471 | this would be to have gdbarch_displaced_step_copy_insn fully | |
1472 | simulate the effect of PC-relative instructions (and return NULL) | |
1473 | on architectures that use software single-stepping. | |
1474 | ||
1475 | In non-stop mode, we can have independent and simultaneous step | |
1476 | requests, so more than one thread may need to simultaneously step | |
1477 | over a breakpoint. The current implementation assumes there is | |
1478 | only one scratch space per process. In this case, we have to | |
1479 | serialize access to the scratch space. If thread A wants to step | |
1480 | over a breakpoint, but we are currently waiting for some other | |
1481 | thread to complete a displaced step, we leave thread A stopped and | |
1482 | place it in the displaced_step_request_queue. Whenever a displaced | |
1483 | step finishes, we pick the next thread in the queue and start a new | |
1484 | displaced step operation on it. See displaced_step_prepare and | |
1485 | displaced_step_fixup for details. */ | |
1486 | ||
fc1cf338 PA |
1487 | /* Per-inferior displaced stepping state. */ |
1488 | struct displaced_step_inferior_state | |
1489 | { | |
1490 | /* Pointer to next in linked list. */ | |
1491 | struct displaced_step_inferior_state *next; | |
1492 | ||
1493 | /* The process this displaced step state refers to. */ | |
1494 | int pid; | |
1495 | ||
3fc8eb30 PA |
1496 | /* True if preparing a displaced step ever failed. If so, we won't |
1497 | try displaced stepping for this inferior again. */ | |
1498 | int failed_before; | |
1499 | ||
fc1cf338 PA |
1500 | /* If this is not null_ptid, this is the thread carrying out a |
1501 | displaced single-step in process PID. This thread's state will | |
1502 | require fixing up once it has completed its step. */ | |
1503 | ptid_t step_ptid; | |
1504 | ||
1505 | /* The architecture the thread had when we stepped it. */ | |
1506 | struct gdbarch *step_gdbarch; | |
1507 | ||
1508 | /* The closure provided gdbarch_displaced_step_copy_insn, to be used | |
1509 | for post-step cleanup. */ | |
1510 | struct displaced_step_closure *step_closure; | |
1511 | ||
1512 | /* The address of the original instruction, and the copy we | |
1513 | made. */ | |
1514 | CORE_ADDR step_original, step_copy; | |
1515 | ||
1516 | /* Saved contents of copy area. */ | |
1517 | gdb_byte *step_saved_copy; | |
1518 | }; | |
1519 | ||
1520 | /* The list of states of processes involved in displaced stepping | |
1521 | presently. */ | |
1522 | static struct displaced_step_inferior_state *displaced_step_inferior_states; | |
1523 | ||
1524 | /* Get the displaced stepping state of process PID. */ | |
1525 | ||
1526 | static struct displaced_step_inferior_state * | |
1527 | get_displaced_stepping_state (int pid) | |
1528 | { | |
1529 | struct displaced_step_inferior_state *state; | |
1530 | ||
1531 | for (state = displaced_step_inferior_states; | |
1532 | state != NULL; | |
1533 | state = state->next) | |
1534 | if (state->pid == pid) | |
1535 | return state; | |
1536 | ||
1537 | return NULL; | |
1538 | } | |
1539 | ||
372316f1 PA |
1540 | /* Returns true if any inferior has a thread doing a displaced |
1541 | step. */ | |
1542 | ||
1543 | static int | |
1544 | displaced_step_in_progress_any_inferior (void) | |
1545 | { | |
1546 | struct displaced_step_inferior_state *state; | |
1547 | ||
1548 | for (state = displaced_step_inferior_states; | |
1549 | state != NULL; | |
1550 | state = state->next) | |
1551 | if (!ptid_equal (state->step_ptid, null_ptid)) | |
1552 | return 1; | |
1553 | ||
1554 | return 0; | |
1555 | } | |
1556 | ||
c0987663 YQ |
1557 | /* Return true if thread represented by PTID is doing a displaced |
1558 | step. */ | |
1559 | ||
1560 | static int | |
1561 | displaced_step_in_progress_thread (ptid_t ptid) | |
1562 | { | |
1563 | struct displaced_step_inferior_state *displaced; | |
1564 | ||
1565 | gdb_assert (!ptid_equal (ptid, null_ptid)); | |
1566 | ||
1567 | displaced = get_displaced_stepping_state (ptid_get_pid (ptid)); | |
1568 | ||
1569 | return (displaced != NULL && ptid_equal (displaced->step_ptid, ptid)); | |
1570 | } | |
1571 | ||
8f572e5c PA |
1572 | /* Return true if process PID has a thread doing a displaced step. */ |
1573 | ||
1574 | static int | |
1575 | displaced_step_in_progress (int pid) | |
1576 | { | |
1577 | struct displaced_step_inferior_state *displaced; | |
1578 | ||
1579 | displaced = get_displaced_stepping_state (pid); | |
1580 | if (displaced != NULL && !ptid_equal (displaced->step_ptid, null_ptid)) | |
1581 | return 1; | |
1582 | ||
1583 | return 0; | |
1584 | } | |
1585 | ||
fc1cf338 PA |
1586 | /* Add a new displaced stepping state for process PID to the displaced |
1587 | stepping state list, or return a pointer to an already existing | |
1588 | entry, if it already exists. Never returns NULL. */ | |
1589 | ||
1590 | static struct displaced_step_inferior_state * | |
1591 | add_displaced_stepping_state (int pid) | |
1592 | { | |
1593 | struct displaced_step_inferior_state *state; | |
1594 | ||
1595 | for (state = displaced_step_inferior_states; | |
1596 | state != NULL; | |
1597 | state = state->next) | |
1598 | if (state->pid == pid) | |
1599 | return state; | |
237fc4c9 | 1600 | |
8d749320 | 1601 | state = XCNEW (struct displaced_step_inferior_state); |
fc1cf338 PA |
1602 | state->pid = pid; |
1603 | state->next = displaced_step_inferior_states; | |
1604 | displaced_step_inferior_states = state; | |
237fc4c9 | 1605 | |
fc1cf338 PA |
1606 | return state; |
1607 | } | |
1608 | ||
a42244db YQ |
1609 | /* If inferior is in displaced stepping, and ADDR equals to starting address |
1610 | of copy area, return corresponding displaced_step_closure. Otherwise, | |
1611 | return NULL. */ | |
1612 | ||
1613 | struct displaced_step_closure* | |
1614 | get_displaced_step_closure_by_addr (CORE_ADDR addr) | |
1615 | { | |
1616 | struct displaced_step_inferior_state *displaced | |
1617 | = get_displaced_stepping_state (ptid_get_pid (inferior_ptid)); | |
1618 | ||
1619 | /* If checking the mode of displaced instruction in copy area. */ | |
1620 | if (displaced && !ptid_equal (displaced->step_ptid, null_ptid) | |
1621 | && (displaced->step_copy == addr)) | |
1622 | return displaced->step_closure; | |
1623 | ||
1624 | return NULL; | |
1625 | } | |
1626 | ||
fc1cf338 | 1627 | /* Remove the displaced stepping state of process PID. */ |
237fc4c9 | 1628 | |
fc1cf338 PA |
1629 | static void |
1630 | remove_displaced_stepping_state (int pid) | |
1631 | { | |
1632 | struct displaced_step_inferior_state *it, **prev_next_p; | |
237fc4c9 | 1633 | |
fc1cf338 PA |
1634 | gdb_assert (pid != 0); |
1635 | ||
1636 | it = displaced_step_inferior_states; | |
1637 | prev_next_p = &displaced_step_inferior_states; | |
1638 | while (it) | |
1639 | { | |
1640 | if (it->pid == pid) | |
1641 | { | |
1642 | *prev_next_p = it->next; | |
1643 | xfree (it); | |
1644 | return; | |
1645 | } | |
1646 | ||
1647 | prev_next_p = &it->next; | |
1648 | it = *prev_next_p; | |
1649 | } | |
1650 | } | |
1651 | ||
1652 | static void | |
1653 | infrun_inferior_exit (struct inferior *inf) | |
1654 | { | |
1655 | remove_displaced_stepping_state (inf->pid); | |
1656 | } | |
237fc4c9 | 1657 | |
fff08868 HZ |
1658 | /* If ON, and the architecture supports it, GDB will use displaced |
1659 | stepping to step over breakpoints. If OFF, or if the architecture | |
1660 | doesn't support it, GDB will instead use the traditional | |
1661 | hold-and-step approach. If AUTO (which is the default), GDB will | |
1662 | decide which technique to use to step over breakpoints depending on | |
1663 | which of all-stop or non-stop mode is active --- displaced stepping | |
1664 | in non-stop mode; hold-and-step in all-stop mode. */ | |
1665 | ||
72d0e2c5 | 1666 | static enum auto_boolean can_use_displaced_stepping = AUTO_BOOLEAN_AUTO; |
fff08868 | 1667 | |
237fc4c9 PA |
1668 | static void |
1669 | show_can_use_displaced_stepping (struct ui_file *file, int from_tty, | |
1670 | struct cmd_list_element *c, | |
1671 | const char *value) | |
1672 | { | |
72d0e2c5 | 1673 | if (can_use_displaced_stepping == AUTO_BOOLEAN_AUTO) |
3e43a32a MS |
1674 | fprintf_filtered (file, |
1675 | _("Debugger's willingness to use displaced stepping " | |
1676 | "to step over breakpoints is %s (currently %s).\n"), | |
fbea99ea | 1677 | value, target_is_non_stop_p () ? "on" : "off"); |
fff08868 | 1678 | else |
3e43a32a MS |
1679 | fprintf_filtered (file, |
1680 | _("Debugger's willingness to use displaced stepping " | |
1681 | "to step over breakpoints is %s.\n"), value); | |
237fc4c9 PA |
1682 | } |
1683 | ||
fff08868 | 1684 | /* Return non-zero if displaced stepping can/should be used to step |
3fc8eb30 | 1685 | over breakpoints of thread TP. */ |
fff08868 | 1686 | |
237fc4c9 | 1687 | static int |
3fc8eb30 | 1688 | use_displaced_stepping (struct thread_info *tp) |
237fc4c9 | 1689 | { |
3fc8eb30 PA |
1690 | struct regcache *regcache = get_thread_regcache (tp->ptid); |
1691 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
1692 | struct displaced_step_inferior_state *displaced_state; | |
1693 | ||
1694 | displaced_state = get_displaced_stepping_state (ptid_get_pid (tp->ptid)); | |
1695 | ||
fbea99ea PA |
1696 | return (((can_use_displaced_stepping == AUTO_BOOLEAN_AUTO |
1697 | && target_is_non_stop_p ()) | |
72d0e2c5 | 1698 | || can_use_displaced_stepping == AUTO_BOOLEAN_TRUE) |
96429cc8 | 1699 | && gdbarch_displaced_step_copy_insn_p (gdbarch) |
3fc8eb30 PA |
1700 | && find_record_target () == NULL |
1701 | && (displaced_state == NULL | |
1702 | || !displaced_state->failed_before)); | |
237fc4c9 PA |
1703 | } |
1704 | ||
1705 | /* Clean out any stray displaced stepping state. */ | |
1706 | static void | |
fc1cf338 | 1707 | displaced_step_clear (struct displaced_step_inferior_state *displaced) |
237fc4c9 PA |
1708 | { |
1709 | /* Indicate that there is no cleanup pending. */ | |
fc1cf338 | 1710 | displaced->step_ptid = null_ptid; |
237fc4c9 | 1711 | |
6d45d4b4 SM |
1712 | xfree (displaced->step_closure); |
1713 | displaced->step_closure = NULL; | |
237fc4c9 PA |
1714 | } |
1715 | ||
1716 | static void | |
fc1cf338 | 1717 | displaced_step_clear_cleanup (void *arg) |
237fc4c9 | 1718 | { |
9a3c8263 SM |
1719 | struct displaced_step_inferior_state *state |
1720 | = (struct displaced_step_inferior_state *) arg; | |
fc1cf338 PA |
1721 | |
1722 | displaced_step_clear (state); | |
237fc4c9 PA |
1723 | } |
1724 | ||
1725 | /* Dump LEN bytes at BUF in hex to FILE, followed by a newline. */ | |
1726 | void | |
1727 | displaced_step_dump_bytes (struct ui_file *file, | |
1728 | const gdb_byte *buf, | |
1729 | size_t len) | |
1730 | { | |
1731 | int i; | |
1732 | ||
1733 | for (i = 0; i < len; i++) | |
1734 | fprintf_unfiltered (file, "%02x ", buf[i]); | |
1735 | fputs_unfiltered ("\n", file); | |
1736 | } | |
1737 | ||
1738 | /* Prepare to single-step, using displaced stepping. | |
1739 | ||
1740 | Note that we cannot use displaced stepping when we have a signal to | |
1741 | deliver. If we have a signal to deliver and an instruction to step | |
1742 | over, then after the step, there will be no indication from the | |
1743 | target whether the thread entered a signal handler or ignored the | |
1744 | signal and stepped over the instruction successfully --- both cases | |
1745 | result in a simple SIGTRAP. In the first case we mustn't do a | |
1746 | fixup, and in the second case we must --- but we can't tell which. | |
1747 | Comments in the code for 'random signals' in handle_inferior_event | |
1748 | explain how we handle this case instead. | |
1749 | ||
1750 | Returns 1 if preparing was successful -- this thread is going to be | |
7f03bd92 PA |
1751 | stepped now; 0 if displaced stepping this thread got queued; or -1 |
1752 | if this instruction can't be displaced stepped. */ | |
1753 | ||
237fc4c9 | 1754 | static int |
3fc8eb30 | 1755 | displaced_step_prepare_throw (ptid_t ptid) |
237fc4c9 | 1756 | { |
2989a365 | 1757 | struct cleanup *ignore_cleanups; |
c1e36e3e | 1758 | struct thread_info *tp = find_thread_ptid (ptid); |
237fc4c9 PA |
1759 | struct regcache *regcache = get_thread_regcache (ptid); |
1760 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
d35ae833 | 1761 | struct address_space *aspace = get_regcache_aspace (regcache); |
237fc4c9 PA |
1762 | CORE_ADDR original, copy; |
1763 | ULONGEST len; | |
1764 | struct displaced_step_closure *closure; | |
fc1cf338 | 1765 | struct displaced_step_inferior_state *displaced; |
9e529e1d | 1766 | int status; |
237fc4c9 PA |
1767 | |
1768 | /* We should never reach this function if the architecture does not | |
1769 | support displaced stepping. */ | |
1770 | gdb_assert (gdbarch_displaced_step_copy_insn_p (gdbarch)); | |
1771 | ||
c2829269 PA |
1772 | /* Nor if the thread isn't meant to step over a breakpoint. */ |
1773 | gdb_assert (tp->control.trap_expected); | |
1774 | ||
c1e36e3e PA |
1775 | /* Disable range stepping while executing in the scratch pad. We |
1776 | want a single-step even if executing the displaced instruction in | |
1777 | the scratch buffer lands within the stepping range (e.g., a | |
1778 | jump/branch). */ | |
1779 | tp->control.may_range_step = 0; | |
1780 | ||
fc1cf338 PA |
1781 | /* We have to displaced step one thread at a time, as we only have |
1782 | access to a single scratch space per inferior. */ | |
237fc4c9 | 1783 | |
fc1cf338 PA |
1784 | displaced = add_displaced_stepping_state (ptid_get_pid (ptid)); |
1785 | ||
1786 | if (!ptid_equal (displaced->step_ptid, null_ptid)) | |
237fc4c9 PA |
1787 | { |
1788 | /* Already waiting for a displaced step to finish. Defer this | |
1789 | request and place in queue. */ | |
237fc4c9 PA |
1790 | |
1791 | if (debug_displaced) | |
1792 | fprintf_unfiltered (gdb_stdlog, | |
c2829269 | 1793 | "displaced: deferring step of %s\n", |
237fc4c9 PA |
1794 | target_pid_to_str (ptid)); |
1795 | ||
c2829269 | 1796 | thread_step_over_chain_enqueue (tp); |
237fc4c9 PA |
1797 | return 0; |
1798 | } | |
1799 | else | |
1800 | { | |
1801 | if (debug_displaced) | |
1802 | fprintf_unfiltered (gdb_stdlog, | |
1803 | "displaced: stepping %s now\n", | |
1804 | target_pid_to_str (ptid)); | |
1805 | } | |
1806 | ||
fc1cf338 | 1807 | displaced_step_clear (displaced); |
237fc4c9 | 1808 | |
2989a365 | 1809 | scoped_restore save_inferior_ptid = make_scoped_restore (&inferior_ptid); |
ad53cd71 PA |
1810 | inferior_ptid = ptid; |
1811 | ||
515630c5 | 1812 | original = regcache_read_pc (regcache); |
237fc4c9 PA |
1813 | |
1814 | copy = gdbarch_displaced_step_location (gdbarch); | |
1815 | len = gdbarch_max_insn_length (gdbarch); | |
1816 | ||
d35ae833 PA |
1817 | if (breakpoint_in_range_p (aspace, copy, len)) |
1818 | { | |
1819 | /* There's a breakpoint set in the scratch pad location range | |
1820 | (which is usually around the entry point). We'd either | |
1821 | install it before resuming, which would overwrite/corrupt the | |
1822 | scratch pad, or if it was already inserted, this displaced | |
1823 | step would overwrite it. The latter is OK in the sense that | |
1824 | we already assume that no thread is going to execute the code | |
1825 | in the scratch pad range (after initial startup) anyway, but | |
1826 | the former is unacceptable. Simply punt and fallback to | |
1827 | stepping over this breakpoint in-line. */ | |
1828 | if (debug_displaced) | |
1829 | { | |
1830 | fprintf_unfiltered (gdb_stdlog, | |
1831 | "displaced: breakpoint set in scratch pad. " | |
1832 | "Stepping over breakpoint in-line instead.\n"); | |
1833 | } | |
1834 | ||
d35ae833 PA |
1835 | return -1; |
1836 | } | |
1837 | ||
237fc4c9 | 1838 | /* Save the original contents of the copy area. */ |
224c3ddb | 1839 | displaced->step_saved_copy = (gdb_byte *) xmalloc (len); |
ad53cd71 | 1840 | ignore_cleanups = make_cleanup (free_current_contents, |
fc1cf338 | 1841 | &displaced->step_saved_copy); |
9e529e1d JK |
1842 | status = target_read_memory (copy, displaced->step_saved_copy, len); |
1843 | if (status != 0) | |
1844 | throw_error (MEMORY_ERROR, | |
1845 | _("Error accessing memory address %s (%s) for " | |
1846 | "displaced-stepping scratch space."), | |
1847 | paddress (gdbarch, copy), safe_strerror (status)); | |
237fc4c9 PA |
1848 | if (debug_displaced) |
1849 | { | |
5af949e3 UW |
1850 | fprintf_unfiltered (gdb_stdlog, "displaced: saved %s: ", |
1851 | paddress (gdbarch, copy)); | |
fc1cf338 PA |
1852 | displaced_step_dump_bytes (gdb_stdlog, |
1853 | displaced->step_saved_copy, | |
1854 | len); | |
237fc4c9 PA |
1855 | }; |
1856 | ||
1857 | closure = gdbarch_displaced_step_copy_insn (gdbarch, | |
ad53cd71 | 1858 | original, copy, regcache); |
7f03bd92 PA |
1859 | if (closure == NULL) |
1860 | { | |
1861 | /* The architecture doesn't know how or want to displaced step | |
1862 | this instruction or instruction sequence. Fallback to | |
1863 | stepping over the breakpoint in-line. */ | |
2989a365 | 1864 | do_cleanups (ignore_cleanups); |
7f03bd92 PA |
1865 | return -1; |
1866 | } | |
237fc4c9 | 1867 | |
9f5a595d UW |
1868 | /* Save the information we need to fix things up if the step |
1869 | succeeds. */ | |
fc1cf338 PA |
1870 | displaced->step_ptid = ptid; |
1871 | displaced->step_gdbarch = gdbarch; | |
1872 | displaced->step_closure = closure; | |
1873 | displaced->step_original = original; | |
1874 | displaced->step_copy = copy; | |
9f5a595d | 1875 | |
fc1cf338 | 1876 | make_cleanup (displaced_step_clear_cleanup, displaced); |
237fc4c9 PA |
1877 | |
1878 | /* Resume execution at the copy. */ | |
515630c5 | 1879 | regcache_write_pc (regcache, copy); |
237fc4c9 | 1880 | |
ad53cd71 PA |
1881 | discard_cleanups (ignore_cleanups); |
1882 | ||
237fc4c9 | 1883 | if (debug_displaced) |
5af949e3 UW |
1884 | fprintf_unfiltered (gdb_stdlog, "displaced: displaced pc to %s\n", |
1885 | paddress (gdbarch, copy)); | |
237fc4c9 | 1886 | |
237fc4c9 PA |
1887 | return 1; |
1888 | } | |
1889 | ||
3fc8eb30 PA |
1890 | /* Wrapper for displaced_step_prepare_throw that disabled further |
1891 | attempts at displaced stepping if we get a memory error. */ | |
1892 | ||
1893 | static int | |
1894 | displaced_step_prepare (ptid_t ptid) | |
1895 | { | |
1896 | int prepared = -1; | |
1897 | ||
1898 | TRY | |
1899 | { | |
1900 | prepared = displaced_step_prepare_throw (ptid); | |
1901 | } | |
1902 | CATCH (ex, RETURN_MASK_ERROR) | |
1903 | { | |
1904 | struct displaced_step_inferior_state *displaced_state; | |
1905 | ||
16b41842 PA |
1906 | if (ex.error != MEMORY_ERROR |
1907 | && ex.error != NOT_SUPPORTED_ERROR) | |
3fc8eb30 PA |
1908 | throw_exception (ex); |
1909 | ||
1910 | if (debug_infrun) | |
1911 | { | |
1912 | fprintf_unfiltered (gdb_stdlog, | |
1913 | "infrun: disabling displaced stepping: %s\n", | |
1914 | ex.message); | |
1915 | } | |
1916 | ||
1917 | /* Be verbose if "set displaced-stepping" is "on", silent if | |
1918 | "auto". */ | |
1919 | if (can_use_displaced_stepping == AUTO_BOOLEAN_TRUE) | |
1920 | { | |
fd7dcb94 | 1921 | warning (_("disabling displaced stepping: %s"), |
3fc8eb30 PA |
1922 | ex.message); |
1923 | } | |
1924 | ||
1925 | /* Disable further displaced stepping attempts. */ | |
1926 | displaced_state | |
1927 | = get_displaced_stepping_state (ptid_get_pid (ptid)); | |
1928 | displaced_state->failed_before = 1; | |
1929 | } | |
1930 | END_CATCH | |
1931 | ||
1932 | return prepared; | |
1933 | } | |
1934 | ||
237fc4c9 | 1935 | static void |
3e43a32a MS |
1936 | write_memory_ptid (ptid_t ptid, CORE_ADDR memaddr, |
1937 | const gdb_byte *myaddr, int len) | |
237fc4c9 | 1938 | { |
2989a365 | 1939 | scoped_restore save_inferior_ptid = make_scoped_restore (&inferior_ptid); |
abbb1732 | 1940 | |
237fc4c9 PA |
1941 | inferior_ptid = ptid; |
1942 | write_memory (memaddr, myaddr, len); | |
237fc4c9 PA |
1943 | } |
1944 | ||
e2d96639 YQ |
1945 | /* Restore the contents of the copy area for thread PTID. */ |
1946 | ||
1947 | static void | |
1948 | displaced_step_restore (struct displaced_step_inferior_state *displaced, | |
1949 | ptid_t ptid) | |
1950 | { | |
1951 | ULONGEST len = gdbarch_max_insn_length (displaced->step_gdbarch); | |
1952 | ||
1953 | write_memory_ptid (ptid, displaced->step_copy, | |
1954 | displaced->step_saved_copy, len); | |
1955 | if (debug_displaced) | |
1956 | fprintf_unfiltered (gdb_stdlog, "displaced: restored %s %s\n", | |
1957 | target_pid_to_str (ptid), | |
1958 | paddress (displaced->step_gdbarch, | |
1959 | displaced->step_copy)); | |
1960 | } | |
1961 | ||
372316f1 PA |
1962 | /* If we displaced stepped an instruction successfully, adjust |
1963 | registers and memory to yield the same effect the instruction would | |
1964 | have had if we had executed it at its original address, and return | |
1965 | 1. If the instruction didn't complete, relocate the PC and return | |
1966 | -1. If the thread wasn't displaced stepping, return 0. */ | |
1967 | ||
1968 | static int | |
2ea28649 | 1969 | displaced_step_fixup (ptid_t event_ptid, enum gdb_signal signal) |
237fc4c9 PA |
1970 | { |
1971 | struct cleanup *old_cleanups; | |
fc1cf338 PA |
1972 | struct displaced_step_inferior_state *displaced |
1973 | = get_displaced_stepping_state (ptid_get_pid (event_ptid)); | |
372316f1 | 1974 | int ret; |
fc1cf338 PA |
1975 | |
1976 | /* Was any thread of this process doing a displaced step? */ | |
1977 | if (displaced == NULL) | |
372316f1 | 1978 | return 0; |
237fc4c9 PA |
1979 | |
1980 | /* Was this event for the pid we displaced? */ | |
fc1cf338 PA |
1981 | if (ptid_equal (displaced->step_ptid, null_ptid) |
1982 | || ! ptid_equal (displaced->step_ptid, event_ptid)) | |
372316f1 | 1983 | return 0; |
237fc4c9 | 1984 | |
fc1cf338 | 1985 | old_cleanups = make_cleanup (displaced_step_clear_cleanup, displaced); |
237fc4c9 | 1986 | |
e2d96639 | 1987 | displaced_step_restore (displaced, displaced->step_ptid); |
237fc4c9 | 1988 | |
cb71640d PA |
1989 | /* Fixup may need to read memory/registers. Switch to the thread |
1990 | that we're fixing up. Also, target_stopped_by_watchpoint checks | |
1991 | the current thread. */ | |
1992 | switch_to_thread (event_ptid); | |
1993 | ||
237fc4c9 | 1994 | /* Did the instruction complete successfully? */ |
cb71640d PA |
1995 | if (signal == GDB_SIGNAL_TRAP |
1996 | && !(target_stopped_by_watchpoint () | |
1997 | && (gdbarch_have_nonsteppable_watchpoint (displaced->step_gdbarch) | |
1998 | || target_have_steppable_watchpoint))) | |
237fc4c9 PA |
1999 | { |
2000 | /* Fix up the resulting state. */ | |
fc1cf338 PA |
2001 | gdbarch_displaced_step_fixup (displaced->step_gdbarch, |
2002 | displaced->step_closure, | |
2003 | displaced->step_original, | |
2004 | displaced->step_copy, | |
2005 | get_thread_regcache (displaced->step_ptid)); | |
372316f1 | 2006 | ret = 1; |
237fc4c9 PA |
2007 | } |
2008 | else | |
2009 | { | |
2010 | /* Since the instruction didn't complete, all we can do is | |
2011 | relocate the PC. */ | |
515630c5 UW |
2012 | struct regcache *regcache = get_thread_regcache (event_ptid); |
2013 | CORE_ADDR pc = regcache_read_pc (regcache); | |
abbb1732 | 2014 | |
fc1cf338 | 2015 | pc = displaced->step_original + (pc - displaced->step_copy); |
515630c5 | 2016 | regcache_write_pc (regcache, pc); |
372316f1 | 2017 | ret = -1; |
237fc4c9 PA |
2018 | } |
2019 | ||
2020 | do_cleanups (old_cleanups); | |
2021 | ||
fc1cf338 | 2022 | displaced->step_ptid = null_ptid; |
372316f1 PA |
2023 | |
2024 | return ret; | |
c2829269 | 2025 | } |
1c5cfe86 | 2026 | |
4d9d9d04 PA |
2027 | /* Data to be passed around while handling an event. This data is |
2028 | discarded between events. */ | |
2029 | struct execution_control_state | |
2030 | { | |
2031 | ptid_t ptid; | |
2032 | /* The thread that got the event, if this was a thread event; NULL | |
2033 | otherwise. */ | |
2034 | struct thread_info *event_thread; | |
2035 | ||
2036 | struct target_waitstatus ws; | |
2037 | int stop_func_filled_in; | |
2038 | CORE_ADDR stop_func_start; | |
2039 | CORE_ADDR stop_func_end; | |
2040 | const char *stop_func_name; | |
2041 | int wait_some_more; | |
2042 | ||
2043 | /* True if the event thread hit the single-step breakpoint of | |
2044 | another thread. Thus the event doesn't cause a stop, the thread | |
2045 | needs to be single-stepped past the single-step breakpoint before | |
2046 | we can switch back to the original stepping thread. */ | |
2047 | int hit_singlestep_breakpoint; | |
2048 | }; | |
2049 | ||
2050 | /* Clear ECS and set it to point at TP. */ | |
c2829269 PA |
2051 | |
2052 | static void | |
4d9d9d04 PA |
2053 | reset_ecs (struct execution_control_state *ecs, struct thread_info *tp) |
2054 | { | |
2055 | memset (ecs, 0, sizeof (*ecs)); | |
2056 | ecs->event_thread = tp; | |
2057 | ecs->ptid = tp->ptid; | |
2058 | } | |
2059 | ||
2060 | static void keep_going_pass_signal (struct execution_control_state *ecs); | |
2061 | static void prepare_to_wait (struct execution_control_state *ecs); | |
2ac7589c | 2062 | static int keep_going_stepped_thread (struct thread_info *tp); |
8d297bbf | 2063 | static step_over_what thread_still_needs_step_over (struct thread_info *tp); |
4d9d9d04 PA |
2064 | |
2065 | /* Are there any pending step-over requests? If so, run all we can | |
2066 | now and return true. Otherwise, return false. */ | |
2067 | ||
2068 | static int | |
c2829269 PA |
2069 | start_step_over (void) |
2070 | { | |
2071 | struct thread_info *tp, *next; | |
2072 | ||
372316f1 PA |
2073 | /* Don't start a new step-over if we already have an in-line |
2074 | step-over operation ongoing. */ | |
2075 | if (step_over_info_valid_p ()) | |
2076 | return 0; | |
2077 | ||
c2829269 | 2078 | for (tp = step_over_queue_head; tp != NULL; tp = next) |
237fc4c9 | 2079 | { |
4d9d9d04 PA |
2080 | struct execution_control_state ecss; |
2081 | struct execution_control_state *ecs = &ecss; | |
8d297bbf | 2082 | step_over_what step_what; |
372316f1 | 2083 | int must_be_in_line; |
c2829269 | 2084 | |
c65d6b55 PA |
2085 | gdb_assert (!tp->stop_requested); |
2086 | ||
c2829269 | 2087 | next = thread_step_over_chain_next (tp); |
237fc4c9 | 2088 | |
c2829269 PA |
2089 | /* If this inferior already has a displaced step in process, |
2090 | don't start a new one. */ | |
4d9d9d04 | 2091 | if (displaced_step_in_progress (ptid_get_pid (tp->ptid))) |
c2829269 PA |
2092 | continue; |
2093 | ||
372316f1 PA |
2094 | step_what = thread_still_needs_step_over (tp); |
2095 | must_be_in_line = ((step_what & STEP_OVER_WATCHPOINT) | |
2096 | || ((step_what & STEP_OVER_BREAKPOINT) | |
3fc8eb30 | 2097 | && !use_displaced_stepping (tp))); |
372316f1 PA |
2098 | |
2099 | /* We currently stop all threads of all processes to step-over | |
2100 | in-line. If we need to start a new in-line step-over, let | |
2101 | any pending displaced steps finish first. */ | |
2102 | if (must_be_in_line && displaced_step_in_progress_any_inferior ()) | |
2103 | return 0; | |
2104 | ||
c2829269 PA |
2105 | thread_step_over_chain_remove (tp); |
2106 | ||
2107 | if (step_over_queue_head == NULL) | |
2108 | { | |
2109 | if (debug_infrun) | |
2110 | fprintf_unfiltered (gdb_stdlog, | |
2111 | "infrun: step-over queue now empty\n"); | |
2112 | } | |
2113 | ||
372316f1 PA |
2114 | if (tp->control.trap_expected |
2115 | || tp->resumed | |
2116 | || tp->executing) | |
ad53cd71 | 2117 | { |
4d9d9d04 PA |
2118 | internal_error (__FILE__, __LINE__, |
2119 | "[%s] has inconsistent state: " | |
372316f1 | 2120 | "trap_expected=%d, resumed=%d, executing=%d\n", |
4d9d9d04 PA |
2121 | target_pid_to_str (tp->ptid), |
2122 | tp->control.trap_expected, | |
372316f1 | 2123 | tp->resumed, |
4d9d9d04 | 2124 | tp->executing); |
ad53cd71 | 2125 | } |
1c5cfe86 | 2126 | |
4d9d9d04 PA |
2127 | if (debug_infrun) |
2128 | fprintf_unfiltered (gdb_stdlog, | |
2129 | "infrun: resuming [%s] for step-over\n", | |
2130 | target_pid_to_str (tp->ptid)); | |
2131 | ||
2132 | /* keep_going_pass_signal skips the step-over if the breakpoint | |
2133 | is no longer inserted. In all-stop, we want to keep looking | |
2134 | for a thread that needs a step-over instead of resuming TP, | |
2135 | because we wouldn't be able to resume anything else until the | |
2136 | target stops again. In non-stop, the resume always resumes | |
2137 | only TP, so it's OK to let the thread resume freely. */ | |
fbea99ea | 2138 | if (!target_is_non_stop_p () && !step_what) |
4d9d9d04 | 2139 | continue; |
8550d3b3 | 2140 | |
4d9d9d04 PA |
2141 | switch_to_thread (tp->ptid); |
2142 | reset_ecs (ecs, tp); | |
2143 | keep_going_pass_signal (ecs); | |
1c5cfe86 | 2144 | |
4d9d9d04 PA |
2145 | if (!ecs->wait_some_more) |
2146 | error (_("Command aborted.")); | |
1c5cfe86 | 2147 | |
372316f1 PA |
2148 | gdb_assert (tp->resumed); |
2149 | ||
2150 | /* If we started a new in-line step-over, we're done. */ | |
2151 | if (step_over_info_valid_p ()) | |
2152 | { | |
2153 | gdb_assert (tp->control.trap_expected); | |
2154 | return 1; | |
2155 | } | |
2156 | ||
fbea99ea | 2157 | if (!target_is_non_stop_p ()) |
4d9d9d04 PA |
2158 | { |
2159 | /* On all-stop, shouldn't have resumed unless we needed a | |
2160 | step over. */ | |
2161 | gdb_assert (tp->control.trap_expected | |
2162 | || tp->step_after_step_resume_breakpoint); | |
2163 | ||
2164 | /* With remote targets (at least), in all-stop, we can't | |
2165 | issue any further remote commands until the program stops | |
2166 | again. */ | |
2167 | return 1; | |
1c5cfe86 | 2168 | } |
c2829269 | 2169 | |
4d9d9d04 PA |
2170 | /* Either the thread no longer needed a step-over, or a new |
2171 | displaced stepping sequence started. Even in the latter | |
2172 | case, continue looking. Maybe we can also start another | |
2173 | displaced step on a thread of other process. */ | |
237fc4c9 | 2174 | } |
4d9d9d04 PA |
2175 | |
2176 | return 0; | |
237fc4c9 PA |
2177 | } |
2178 | ||
5231c1fd PA |
2179 | /* Update global variables holding ptids to hold NEW_PTID if they were |
2180 | holding OLD_PTID. */ | |
2181 | static void | |
2182 | infrun_thread_ptid_changed (ptid_t old_ptid, ptid_t new_ptid) | |
2183 | { | |
fc1cf338 | 2184 | struct displaced_step_inferior_state *displaced; |
5231c1fd PA |
2185 | |
2186 | if (ptid_equal (inferior_ptid, old_ptid)) | |
2187 | inferior_ptid = new_ptid; | |
2188 | ||
fc1cf338 PA |
2189 | for (displaced = displaced_step_inferior_states; |
2190 | displaced; | |
2191 | displaced = displaced->next) | |
2192 | { | |
2193 | if (ptid_equal (displaced->step_ptid, old_ptid)) | |
2194 | displaced->step_ptid = new_ptid; | |
fc1cf338 | 2195 | } |
5231c1fd PA |
2196 | } |
2197 | ||
237fc4c9 PA |
2198 | \f |
2199 | /* Resuming. */ | |
c906108c SS |
2200 | |
2201 | /* Things to clean up if we QUIT out of resume (). */ | |
c906108c | 2202 | static void |
74b7792f | 2203 | resume_cleanups (void *ignore) |
c906108c | 2204 | { |
34b7e8a6 PA |
2205 | if (!ptid_equal (inferior_ptid, null_ptid)) |
2206 | delete_single_step_breakpoints (inferior_thread ()); | |
7c16b83e | 2207 | |
c906108c SS |
2208 | normal_stop (); |
2209 | } | |
2210 | ||
53904c9e AC |
2211 | static const char schedlock_off[] = "off"; |
2212 | static const char schedlock_on[] = "on"; | |
2213 | static const char schedlock_step[] = "step"; | |
f2665db5 | 2214 | static const char schedlock_replay[] = "replay"; |
40478521 | 2215 | static const char *const scheduler_enums[] = { |
ef346e04 AC |
2216 | schedlock_off, |
2217 | schedlock_on, | |
2218 | schedlock_step, | |
f2665db5 | 2219 | schedlock_replay, |
ef346e04 AC |
2220 | NULL |
2221 | }; | |
f2665db5 | 2222 | static const char *scheduler_mode = schedlock_replay; |
920d2a44 AC |
2223 | static void |
2224 | show_scheduler_mode (struct ui_file *file, int from_tty, | |
2225 | struct cmd_list_element *c, const char *value) | |
2226 | { | |
3e43a32a MS |
2227 | fprintf_filtered (file, |
2228 | _("Mode for locking scheduler " | |
2229 | "during execution is \"%s\".\n"), | |
920d2a44 AC |
2230 | value); |
2231 | } | |
c906108c SS |
2232 | |
2233 | static void | |
96baa820 | 2234 | set_schedlock_func (char *args, int from_tty, struct cmd_list_element *c) |
c906108c | 2235 | { |
eefe576e AC |
2236 | if (!target_can_lock_scheduler) |
2237 | { | |
2238 | scheduler_mode = schedlock_off; | |
2239 | error (_("Target '%s' cannot support this command."), target_shortname); | |
2240 | } | |
c906108c SS |
2241 | } |
2242 | ||
d4db2f36 PA |
2243 | /* True if execution commands resume all threads of all processes by |
2244 | default; otherwise, resume only threads of the current inferior | |
2245 | process. */ | |
2246 | int sched_multi = 0; | |
2247 | ||
2facfe5c DD |
2248 | /* Try to setup for software single stepping over the specified location. |
2249 | Return 1 if target_resume() should use hardware single step. | |
2250 | ||
2251 | GDBARCH the current gdbarch. | |
2252 | PC the location to step over. */ | |
2253 | ||
2254 | static int | |
2255 | maybe_software_singlestep (struct gdbarch *gdbarch, CORE_ADDR pc) | |
2256 | { | |
2257 | int hw_step = 1; | |
2258 | ||
f02253f1 | 2259 | if (execution_direction == EXEC_FORWARD |
93f9a11f YQ |
2260 | && gdbarch_software_single_step_p (gdbarch)) |
2261 | hw_step = !insert_single_step_breakpoints (gdbarch); | |
2262 | ||
2facfe5c DD |
2263 | return hw_step; |
2264 | } | |
c906108c | 2265 | |
f3263aa4 PA |
2266 | /* See infrun.h. */ |
2267 | ||
09cee04b PA |
2268 | ptid_t |
2269 | user_visible_resume_ptid (int step) | |
2270 | { | |
f3263aa4 | 2271 | ptid_t resume_ptid; |
09cee04b | 2272 | |
09cee04b PA |
2273 | if (non_stop) |
2274 | { | |
2275 | /* With non-stop mode on, threads are always handled | |
2276 | individually. */ | |
2277 | resume_ptid = inferior_ptid; | |
2278 | } | |
2279 | else if ((scheduler_mode == schedlock_on) | |
03d46957 | 2280 | || (scheduler_mode == schedlock_step && step)) |
09cee04b | 2281 | { |
f3263aa4 PA |
2282 | /* User-settable 'scheduler' mode requires solo thread |
2283 | resume. */ | |
09cee04b PA |
2284 | resume_ptid = inferior_ptid; |
2285 | } | |
f2665db5 MM |
2286 | else if ((scheduler_mode == schedlock_replay) |
2287 | && target_record_will_replay (minus_one_ptid, execution_direction)) | |
2288 | { | |
2289 | /* User-settable 'scheduler' mode requires solo thread resume in replay | |
2290 | mode. */ | |
2291 | resume_ptid = inferior_ptid; | |
2292 | } | |
f3263aa4 PA |
2293 | else if (!sched_multi && target_supports_multi_process ()) |
2294 | { | |
2295 | /* Resume all threads of the current process (and none of other | |
2296 | processes). */ | |
2297 | resume_ptid = pid_to_ptid (ptid_get_pid (inferior_ptid)); | |
2298 | } | |
2299 | else | |
2300 | { | |
2301 | /* Resume all threads of all processes. */ | |
2302 | resume_ptid = RESUME_ALL; | |
2303 | } | |
09cee04b PA |
2304 | |
2305 | return resume_ptid; | |
2306 | } | |
2307 | ||
fbea99ea PA |
2308 | /* Return a ptid representing the set of threads that we will resume, |
2309 | in the perspective of the target, assuming run control handling | |
2310 | does not require leaving some threads stopped (e.g., stepping past | |
2311 | breakpoint). USER_STEP indicates whether we're about to start the | |
2312 | target for a stepping command. */ | |
2313 | ||
2314 | static ptid_t | |
2315 | internal_resume_ptid (int user_step) | |
2316 | { | |
2317 | /* In non-stop, we always control threads individually. Note that | |
2318 | the target may always work in non-stop mode even with "set | |
2319 | non-stop off", in which case user_visible_resume_ptid could | |
2320 | return a wildcard ptid. */ | |
2321 | if (target_is_non_stop_p ()) | |
2322 | return inferior_ptid; | |
2323 | else | |
2324 | return user_visible_resume_ptid (user_step); | |
2325 | } | |
2326 | ||
64ce06e4 PA |
2327 | /* Wrapper for target_resume, that handles infrun-specific |
2328 | bookkeeping. */ | |
2329 | ||
2330 | static void | |
2331 | do_target_resume (ptid_t resume_ptid, int step, enum gdb_signal sig) | |
2332 | { | |
2333 | struct thread_info *tp = inferior_thread (); | |
2334 | ||
c65d6b55 PA |
2335 | gdb_assert (!tp->stop_requested); |
2336 | ||
64ce06e4 | 2337 | /* Install inferior's terminal modes. */ |
223ffa71 | 2338 | target_terminal::inferior (); |
64ce06e4 PA |
2339 | |
2340 | /* Avoid confusing the next resume, if the next stop/resume | |
2341 | happens to apply to another thread. */ | |
2342 | tp->suspend.stop_signal = GDB_SIGNAL_0; | |
2343 | ||
8f572e5c PA |
2344 | /* Advise target which signals may be handled silently. |
2345 | ||
2346 | If we have removed breakpoints because we are stepping over one | |
2347 | in-line (in any thread), we need to receive all signals to avoid | |
2348 | accidentally skipping a breakpoint during execution of a signal | |
2349 | handler. | |
2350 | ||
2351 | Likewise if we're displaced stepping, otherwise a trap for a | |
2352 | breakpoint in a signal handler might be confused with the | |
2353 | displaced step finishing. We don't make the displaced_step_fixup | |
2354 | step distinguish the cases instead, because: | |
2355 | ||
2356 | - a backtrace while stopped in the signal handler would show the | |
2357 | scratch pad as frame older than the signal handler, instead of | |
2358 | the real mainline code. | |
2359 | ||
2360 | - when the thread is later resumed, the signal handler would | |
2361 | return to the scratch pad area, which would no longer be | |
2362 | valid. */ | |
2363 | if (step_over_info_valid_p () | |
2364 | || displaced_step_in_progress (ptid_get_pid (tp->ptid))) | |
64ce06e4 PA |
2365 | target_pass_signals (0, NULL); |
2366 | else | |
2367 | target_pass_signals ((int) GDB_SIGNAL_LAST, signal_pass); | |
2368 | ||
2369 | target_resume (resume_ptid, step, sig); | |
85ad3aaf PA |
2370 | |
2371 | target_commit_resume (); | |
64ce06e4 PA |
2372 | } |
2373 | ||
c906108c SS |
2374 | /* Resume the inferior, but allow a QUIT. This is useful if the user |
2375 | wants to interrupt some lengthy single-stepping operation | |
2376 | (for child processes, the SIGINT goes to the inferior, and so | |
2377 | we get a SIGINT random_signal, but for remote debugging and perhaps | |
2378 | other targets, that's not true). | |
2379 | ||
c906108c SS |
2380 | SIG is the signal to give the inferior (zero for none). */ |
2381 | void | |
64ce06e4 | 2382 | resume (enum gdb_signal sig) |
c906108c | 2383 | { |
74b7792f | 2384 | struct cleanup *old_cleanups = make_cleanup (resume_cleanups, 0); |
515630c5 UW |
2385 | struct regcache *regcache = get_current_regcache (); |
2386 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
4e1c45ea | 2387 | struct thread_info *tp = inferior_thread (); |
515630c5 | 2388 | CORE_ADDR pc = regcache_read_pc (regcache); |
6c95b8df | 2389 | struct address_space *aspace = get_regcache_aspace (regcache); |
b0f16a3e | 2390 | ptid_t resume_ptid; |
856e7dd6 PA |
2391 | /* This represents the user's step vs continue request. When |
2392 | deciding whether "set scheduler-locking step" applies, it's the | |
2393 | user's intention that counts. */ | |
2394 | const int user_step = tp->control.stepping_command; | |
64ce06e4 PA |
2395 | /* This represents what we'll actually request the target to do. |
2396 | This can decay from a step to a continue, if e.g., we need to | |
2397 | implement single-stepping with breakpoints (software | |
2398 | single-step). */ | |
6b403daa | 2399 | int step; |
c7e8a53c | 2400 | |
c65d6b55 | 2401 | gdb_assert (!tp->stop_requested); |
c2829269 PA |
2402 | gdb_assert (!thread_is_in_step_over_chain (tp)); |
2403 | ||
c906108c SS |
2404 | QUIT; |
2405 | ||
372316f1 PA |
2406 | if (tp->suspend.waitstatus_pending_p) |
2407 | { | |
2408 | if (debug_infrun) | |
2409 | { | |
23fdd69e SM |
2410 | std::string statstr |
2411 | = target_waitstatus_to_string (&tp->suspend.waitstatus); | |
372316f1 | 2412 | |
372316f1 | 2413 | fprintf_unfiltered (gdb_stdlog, |
23fdd69e SM |
2414 | "infrun: resume: thread %s has pending wait " |
2415 | "status %s (currently_stepping=%d).\n", | |
2416 | target_pid_to_str (tp->ptid), statstr.c_str (), | |
372316f1 | 2417 | currently_stepping (tp)); |
372316f1 PA |
2418 | } |
2419 | ||
2420 | tp->resumed = 1; | |
2421 | ||
2422 | /* FIXME: What should we do if we are supposed to resume this | |
2423 | thread with a signal? Maybe we should maintain a queue of | |
2424 | pending signals to deliver. */ | |
2425 | if (sig != GDB_SIGNAL_0) | |
2426 | { | |
fd7dcb94 | 2427 | warning (_("Couldn't deliver signal %s to %s."), |
372316f1 PA |
2428 | gdb_signal_to_name (sig), target_pid_to_str (tp->ptid)); |
2429 | } | |
2430 | ||
2431 | tp->suspend.stop_signal = GDB_SIGNAL_0; | |
2432 | discard_cleanups (old_cleanups); | |
2433 | ||
2434 | if (target_can_async_p ()) | |
2435 | target_async (1); | |
2436 | return; | |
2437 | } | |
2438 | ||
2439 | tp->stepped_breakpoint = 0; | |
2440 | ||
6b403daa PA |
2441 | /* Depends on stepped_breakpoint. */ |
2442 | step = currently_stepping (tp); | |
2443 | ||
74609e71 YQ |
2444 | if (current_inferior ()->waiting_for_vfork_done) |
2445 | { | |
48f9886d PA |
2446 | /* Don't try to single-step a vfork parent that is waiting for |
2447 | the child to get out of the shared memory region (by exec'ing | |
2448 | or exiting). This is particularly important on software | |
2449 | single-step archs, as the child process would trip on the | |
2450 | software single step breakpoint inserted for the parent | |
2451 | process. Since the parent will not actually execute any | |
2452 | instruction until the child is out of the shared region (such | |
2453 | are vfork's semantics), it is safe to simply continue it. | |
2454 | Eventually, we'll see a TARGET_WAITKIND_VFORK_DONE event for | |
2455 | the parent, and tell it to `keep_going', which automatically | |
2456 | re-sets it stepping. */ | |
74609e71 YQ |
2457 | if (debug_infrun) |
2458 | fprintf_unfiltered (gdb_stdlog, | |
2459 | "infrun: resume : clear step\n"); | |
a09dd441 | 2460 | step = 0; |
74609e71 YQ |
2461 | } |
2462 | ||
527159b7 | 2463 | if (debug_infrun) |
237fc4c9 | 2464 | fprintf_unfiltered (gdb_stdlog, |
c9737c08 | 2465 | "infrun: resume (step=%d, signal=%s), " |
0d9a9a5f | 2466 | "trap_expected=%d, current thread [%s] at %s\n", |
c9737c08 PA |
2467 | step, gdb_signal_to_symbol_string (sig), |
2468 | tp->control.trap_expected, | |
0d9a9a5f PA |
2469 | target_pid_to_str (inferior_ptid), |
2470 | paddress (gdbarch, pc)); | |
c906108c | 2471 | |
c2c6d25f JM |
2472 | /* Normally, by the time we reach `resume', the breakpoints are either |
2473 | removed or inserted, as appropriate. The exception is if we're sitting | |
2474 | at a permanent breakpoint; we need to step over it, but permanent | |
2475 | breakpoints can't be removed. So we have to test for it here. */ | |
6c95b8df | 2476 | if (breakpoint_here_p (aspace, pc) == permanent_breakpoint_here) |
6d350bb5 | 2477 | { |
af48d08f PA |
2478 | if (sig != GDB_SIGNAL_0) |
2479 | { | |
2480 | /* We have a signal to pass to the inferior. The resume | |
2481 | may, or may not take us to the signal handler. If this | |
2482 | is a step, we'll need to stop in the signal handler, if | |
2483 | there's one, (if the target supports stepping into | |
2484 | handlers), or in the next mainline instruction, if | |
2485 | there's no handler. If this is a continue, we need to be | |
2486 | sure to run the handler with all breakpoints inserted. | |
2487 | In all cases, set a breakpoint at the current address | |
2488 | (where the handler returns to), and once that breakpoint | |
2489 | is hit, resume skipping the permanent breakpoint. If | |
2490 | that breakpoint isn't hit, then we've stepped into the | |
2491 | signal handler (or hit some other event). We'll delete | |
2492 | the step-resume breakpoint then. */ | |
2493 | ||
2494 | if (debug_infrun) | |
2495 | fprintf_unfiltered (gdb_stdlog, | |
2496 | "infrun: resume: skipping permanent breakpoint, " | |
2497 | "deliver signal first\n"); | |
2498 | ||
2499 | clear_step_over_info (); | |
2500 | tp->control.trap_expected = 0; | |
2501 | ||
2502 | if (tp->control.step_resume_breakpoint == NULL) | |
2503 | { | |
2504 | /* Set a "high-priority" step-resume, as we don't want | |
2505 | user breakpoints at PC to trigger (again) when this | |
2506 | hits. */ | |
2507 | insert_hp_step_resume_breakpoint_at_frame (get_current_frame ()); | |
2508 | gdb_assert (tp->control.step_resume_breakpoint->loc->permanent); | |
2509 | ||
2510 | tp->step_after_step_resume_breakpoint = step; | |
2511 | } | |
2512 | ||
2513 | insert_breakpoints (); | |
2514 | } | |
2515 | else | |
2516 | { | |
2517 | /* There's no signal to pass, we can go ahead and skip the | |
2518 | permanent breakpoint manually. */ | |
2519 | if (debug_infrun) | |
2520 | fprintf_unfiltered (gdb_stdlog, | |
2521 | "infrun: resume: skipping permanent breakpoint\n"); | |
2522 | gdbarch_skip_permanent_breakpoint (gdbarch, regcache); | |
2523 | /* Update pc to reflect the new address from which we will | |
2524 | execute instructions. */ | |
2525 | pc = regcache_read_pc (regcache); | |
2526 | ||
2527 | if (step) | |
2528 | { | |
2529 | /* We've already advanced the PC, so the stepping part | |
2530 | is done. Now we need to arrange for a trap to be | |
2531 | reported to handle_inferior_event. Set a breakpoint | |
2532 | at the current PC, and run to it. Don't update | |
2533 | prev_pc, because if we end in | |
44a1ee51 PA |
2534 | switch_back_to_stepped_thread, we want the "expected |
2535 | thread advanced also" branch to be taken. IOW, we | |
2536 | don't want this thread to step further from PC | |
af48d08f | 2537 | (overstep). */ |
1ac806b8 | 2538 | gdb_assert (!step_over_info_valid_p ()); |
af48d08f PA |
2539 | insert_single_step_breakpoint (gdbarch, aspace, pc); |
2540 | insert_breakpoints (); | |
2541 | ||
fbea99ea | 2542 | resume_ptid = internal_resume_ptid (user_step); |
1ac806b8 | 2543 | do_target_resume (resume_ptid, 0, GDB_SIGNAL_0); |
af48d08f | 2544 | discard_cleanups (old_cleanups); |
372316f1 | 2545 | tp->resumed = 1; |
af48d08f PA |
2546 | return; |
2547 | } | |
2548 | } | |
6d350bb5 | 2549 | } |
c2c6d25f | 2550 | |
c1e36e3e PA |
2551 | /* If we have a breakpoint to step over, make sure to do a single |
2552 | step only. Same if we have software watchpoints. */ | |
2553 | if (tp->control.trap_expected || bpstat_should_step ()) | |
2554 | tp->control.may_range_step = 0; | |
2555 | ||
237fc4c9 PA |
2556 | /* If enabled, step over breakpoints by executing a copy of the |
2557 | instruction at a different address. | |
2558 | ||
2559 | We can't use displaced stepping when we have a signal to deliver; | |
2560 | the comments for displaced_step_prepare explain why. The | |
2561 | comments in the handle_inferior event for dealing with 'random | |
74609e71 YQ |
2562 | signals' explain what we do instead. |
2563 | ||
2564 | We can't use displaced stepping when we are waiting for vfork_done | |
2565 | event, displaced stepping breaks the vfork child similarly as single | |
2566 | step software breakpoint. */ | |
3fc8eb30 PA |
2567 | if (tp->control.trap_expected |
2568 | && use_displaced_stepping (tp) | |
cb71640d | 2569 | && !step_over_info_valid_p () |
a493e3e2 | 2570 | && sig == GDB_SIGNAL_0 |
74609e71 | 2571 | && !current_inferior ()->waiting_for_vfork_done) |
237fc4c9 | 2572 | { |
3fc8eb30 | 2573 | int prepared = displaced_step_prepare (inferior_ptid); |
fc1cf338 | 2574 | |
3fc8eb30 | 2575 | if (prepared == 0) |
d56b7306 | 2576 | { |
4d9d9d04 PA |
2577 | if (debug_infrun) |
2578 | fprintf_unfiltered (gdb_stdlog, | |
2579 | "Got placed in step-over queue\n"); | |
2580 | ||
2581 | tp->control.trap_expected = 0; | |
d56b7306 VP |
2582 | discard_cleanups (old_cleanups); |
2583 | return; | |
2584 | } | |
3fc8eb30 PA |
2585 | else if (prepared < 0) |
2586 | { | |
2587 | /* Fallback to stepping over the breakpoint in-line. */ | |
2588 | ||
2589 | if (target_is_non_stop_p ()) | |
2590 | stop_all_threads (); | |
2591 | ||
2592 | set_step_over_info (get_regcache_aspace (regcache), | |
21edc42f | 2593 | regcache_read_pc (regcache), 0, tp->global_num); |
3fc8eb30 PA |
2594 | |
2595 | step = maybe_software_singlestep (gdbarch, pc); | |
2596 | ||
2597 | insert_breakpoints (); | |
2598 | } | |
2599 | else if (prepared > 0) | |
2600 | { | |
2601 | struct displaced_step_inferior_state *displaced; | |
99e40580 | 2602 | |
3fc8eb30 PA |
2603 | /* Update pc to reflect the new address from which we will |
2604 | execute instructions due to displaced stepping. */ | |
2605 | pc = regcache_read_pc (get_thread_regcache (inferior_ptid)); | |
ca7781d2 | 2606 | |
3fc8eb30 PA |
2607 | displaced = get_displaced_stepping_state (ptid_get_pid (inferior_ptid)); |
2608 | step = gdbarch_displaced_step_hw_singlestep (gdbarch, | |
2609 | displaced->step_closure); | |
2610 | } | |
237fc4c9 PA |
2611 | } |
2612 | ||
2facfe5c | 2613 | /* Do we need to do it the hard way, w/temp breakpoints? */ |
99e40580 | 2614 | else if (step) |
2facfe5c | 2615 | step = maybe_software_singlestep (gdbarch, pc); |
c906108c | 2616 | |
30852783 UW |
2617 | /* Currently, our software single-step implementation leads to different |
2618 | results than hardware single-stepping in one situation: when stepping | |
2619 | into delivering a signal which has an associated signal handler, | |
2620 | hardware single-step will stop at the first instruction of the handler, | |
2621 | while software single-step will simply skip execution of the handler. | |
2622 | ||
2623 | For now, this difference in behavior is accepted since there is no | |
2624 | easy way to actually implement single-stepping into a signal handler | |
2625 | without kernel support. | |
2626 | ||
2627 | However, there is one scenario where this difference leads to follow-on | |
2628 | problems: if we're stepping off a breakpoint by removing all breakpoints | |
2629 | and then single-stepping. In this case, the software single-step | |
2630 | behavior means that even if there is a *breakpoint* in the signal | |
2631 | handler, GDB still would not stop. | |
2632 | ||
2633 | Fortunately, we can at least fix this particular issue. We detect | |
2634 | here the case where we are about to deliver a signal while software | |
2635 | single-stepping with breakpoints removed. In this situation, we | |
2636 | revert the decisions to remove all breakpoints and insert single- | |
2637 | step breakpoints, and instead we install a step-resume breakpoint | |
2638 | at the current address, deliver the signal without stepping, and | |
2639 | once we arrive back at the step-resume breakpoint, actually step | |
2640 | over the breakpoint we originally wanted to step over. */ | |
34b7e8a6 | 2641 | if (thread_has_single_step_breakpoints_set (tp) |
6cc83d2a PA |
2642 | && sig != GDB_SIGNAL_0 |
2643 | && step_over_info_valid_p ()) | |
30852783 UW |
2644 | { |
2645 | /* If we have nested signals or a pending signal is delivered | |
2646 | immediately after a handler returns, might might already have | |
2647 | a step-resume breakpoint set on the earlier handler. We cannot | |
2648 | set another step-resume breakpoint; just continue on until the | |
2649 | original breakpoint is hit. */ | |
2650 | if (tp->control.step_resume_breakpoint == NULL) | |
2651 | { | |
2c03e5be | 2652 | insert_hp_step_resume_breakpoint_at_frame (get_current_frame ()); |
30852783 UW |
2653 | tp->step_after_step_resume_breakpoint = 1; |
2654 | } | |
2655 | ||
34b7e8a6 | 2656 | delete_single_step_breakpoints (tp); |
30852783 | 2657 | |
31e77af2 | 2658 | clear_step_over_info (); |
30852783 | 2659 | tp->control.trap_expected = 0; |
31e77af2 PA |
2660 | |
2661 | insert_breakpoints (); | |
30852783 UW |
2662 | } |
2663 | ||
b0f16a3e SM |
2664 | /* If STEP is set, it's a request to use hardware stepping |
2665 | facilities. But in that case, we should never | |
2666 | use singlestep breakpoint. */ | |
34b7e8a6 | 2667 | gdb_assert (!(thread_has_single_step_breakpoints_set (tp) && step)); |
dfcd3bfb | 2668 | |
fbea99ea | 2669 | /* Decide the set of threads to ask the target to resume. */ |
1946c4cc | 2670 | if (tp->control.trap_expected) |
b0f16a3e SM |
2671 | { |
2672 | /* We're allowing a thread to run past a breakpoint it has | |
1946c4cc YQ |
2673 | hit, either by single-stepping the thread with the breakpoint |
2674 | removed, or by displaced stepping, with the breakpoint inserted. | |
2675 | In the former case, we need to single-step only this thread, | |
2676 | and keep others stopped, as they can miss this breakpoint if | |
2677 | allowed to run. That's not really a problem for displaced | |
2678 | stepping, but, we still keep other threads stopped, in case | |
2679 | another thread is also stopped for a breakpoint waiting for | |
2680 | its turn in the displaced stepping queue. */ | |
b0f16a3e SM |
2681 | resume_ptid = inferior_ptid; |
2682 | } | |
fbea99ea PA |
2683 | else |
2684 | resume_ptid = internal_resume_ptid (user_step); | |
d4db2f36 | 2685 | |
7f5ef605 PA |
2686 | if (execution_direction != EXEC_REVERSE |
2687 | && step && breakpoint_inserted_here_p (aspace, pc)) | |
b0f16a3e | 2688 | { |
372316f1 PA |
2689 | /* There are two cases where we currently need to step a |
2690 | breakpoint instruction when we have a signal to deliver: | |
2691 | ||
2692 | - See handle_signal_stop where we handle random signals that | |
2693 | could take out us out of the stepping range. Normally, in | |
2694 | that case we end up continuing (instead of stepping) over the | |
7f5ef605 PA |
2695 | signal handler with a breakpoint at PC, but there are cases |
2696 | where we should _always_ single-step, even if we have a | |
2697 | step-resume breakpoint, like when a software watchpoint is | |
2698 | set. Assuming single-stepping and delivering a signal at the | |
2699 | same time would takes us to the signal handler, then we could | |
2700 | have removed the breakpoint at PC to step over it. However, | |
2701 | some hardware step targets (like e.g., Mac OS) can't step | |
2702 | into signal handlers, and for those, we need to leave the | |
2703 | breakpoint at PC inserted, as otherwise if the handler | |
2704 | recurses and executes PC again, it'll miss the breakpoint. | |
2705 | So we leave the breakpoint inserted anyway, but we need to | |
2706 | record that we tried to step a breakpoint instruction, so | |
372316f1 PA |
2707 | that adjust_pc_after_break doesn't end up confused. |
2708 | ||
2709 | - In non-stop if we insert a breakpoint (e.g., a step-resume) | |
2710 | in one thread after another thread that was stepping had been | |
2711 | momentarily paused for a step-over. When we re-resume the | |
2712 | stepping thread, it may be resumed from that address with a | |
2713 | breakpoint that hasn't trapped yet. Seen with | |
2714 | gdb.threads/non-stop-fair-events.exp, on targets that don't | |
2715 | do displaced stepping. */ | |
2716 | ||
2717 | if (debug_infrun) | |
2718 | fprintf_unfiltered (gdb_stdlog, | |
2719 | "infrun: resume: [%s] stepped breakpoint\n", | |
2720 | target_pid_to_str (tp->ptid)); | |
7f5ef605 PA |
2721 | |
2722 | tp->stepped_breakpoint = 1; | |
2723 | ||
b0f16a3e SM |
2724 | /* Most targets can step a breakpoint instruction, thus |
2725 | executing it normally. But if this one cannot, just | |
2726 | continue and we will hit it anyway. */ | |
7f5ef605 | 2727 | if (gdbarch_cannot_step_breakpoint (gdbarch)) |
b0f16a3e SM |
2728 | step = 0; |
2729 | } | |
ef5cf84e | 2730 | |
b0f16a3e | 2731 | if (debug_displaced |
cb71640d | 2732 | && tp->control.trap_expected |
3fc8eb30 | 2733 | && use_displaced_stepping (tp) |
cb71640d | 2734 | && !step_over_info_valid_p ()) |
b0f16a3e | 2735 | { |
d9b67d9f | 2736 | struct regcache *resume_regcache = get_thread_regcache (tp->ptid); |
b0f16a3e SM |
2737 | struct gdbarch *resume_gdbarch = get_regcache_arch (resume_regcache); |
2738 | CORE_ADDR actual_pc = regcache_read_pc (resume_regcache); | |
2739 | gdb_byte buf[4]; | |
2740 | ||
2741 | fprintf_unfiltered (gdb_stdlog, "displaced: run %s: ", | |
2742 | paddress (resume_gdbarch, actual_pc)); | |
2743 | read_memory (actual_pc, buf, sizeof (buf)); | |
2744 | displaced_step_dump_bytes (gdb_stdlog, buf, sizeof (buf)); | |
2745 | } | |
237fc4c9 | 2746 | |
b0f16a3e SM |
2747 | if (tp->control.may_range_step) |
2748 | { | |
2749 | /* If we're resuming a thread with the PC out of the step | |
2750 | range, then we're doing some nested/finer run control | |
2751 | operation, like stepping the thread out of the dynamic | |
2752 | linker or the displaced stepping scratch pad. We | |
2753 | shouldn't have allowed a range step then. */ | |
2754 | gdb_assert (pc_in_thread_step_range (pc, tp)); | |
2755 | } | |
c1e36e3e | 2756 | |
64ce06e4 | 2757 | do_target_resume (resume_ptid, step, sig); |
372316f1 | 2758 | tp->resumed = 1; |
c906108c SS |
2759 | discard_cleanups (old_cleanups); |
2760 | } | |
2761 | \f | |
237fc4c9 | 2762 | /* Proceeding. */ |
c906108c | 2763 | |
4c2f2a79 PA |
2764 | /* See infrun.h. */ |
2765 | ||
2766 | /* Counter that tracks number of user visible stops. This can be used | |
2767 | to tell whether a command has proceeded the inferior past the | |
2768 | current location. This allows e.g., inferior function calls in | |
2769 | breakpoint commands to not interrupt the command list. When the | |
2770 | call finishes successfully, the inferior is standing at the same | |
2771 | breakpoint as if nothing happened (and so we don't call | |
2772 | normal_stop). */ | |
2773 | static ULONGEST current_stop_id; | |
2774 | ||
2775 | /* See infrun.h. */ | |
2776 | ||
2777 | ULONGEST | |
2778 | get_stop_id (void) | |
2779 | { | |
2780 | return current_stop_id; | |
2781 | } | |
2782 | ||
2783 | /* Called when we report a user visible stop. */ | |
2784 | ||
2785 | static void | |
2786 | new_stop_id (void) | |
2787 | { | |
2788 | current_stop_id++; | |
2789 | } | |
2790 | ||
c906108c SS |
2791 | /* Clear out all variables saying what to do when inferior is continued. |
2792 | First do this, then set the ones you want, then call `proceed'. */ | |
2793 | ||
a7212384 UW |
2794 | static void |
2795 | clear_proceed_status_thread (struct thread_info *tp) | |
c906108c | 2796 | { |
a7212384 UW |
2797 | if (debug_infrun) |
2798 | fprintf_unfiltered (gdb_stdlog, | |
2799 | "infrun: clear_proceed_status_thread (%s)\n", | |
2800 | target_pid_to_str (tp->ptid)); | |
d6b48e9c | 2801 | |
372316f1 PA |
2802 | /* If we're starting a new sequence, then the previous finished |
2803 | single-step is no longer relevant. */ | |
2804 | if (tp->suspend.waitstatus_pending_p) | |
2805 | { | |
2806 | if (tp->suspend.stop_reason == TARGET_STOPPED_BY_SINGLE_STEP) | |
2807 | { | |
2808 | if (debug_infrun) | |
2809 | fprintf_unfiltered (gdb_stdlog, | |
2810 | "infrun: clear_proceed_status: pending " | |
2811 | "event of %s was a finished step. " | |
2812 | "Discarding.\n", | |
2813 | target_pid_to_str (tp->ptid)); | |
2814 | ||
2815 | tp->suspend.waitstatus_pending_p = 0; | |
2816 | tp->suspend.stop_reason = TARGET_STOPPED_BY_NO_REASON; | |
2817 | } | |
2818 | else if (debug_infrun) | |
2819 | { | |
23fdd69e SM |
2820 | std::string statstr |
2821 | = target_waitstatus_to_string (&tp->suspend.waitstatus); | |
372316f1 | 2822 | |
372316f1 PA |
2823 | fprintf_unfiltered (gdb_stdlog, |
2824 | "infrun: clear_proceed_status_thread: thread %s " | |
2825 | "has pending wait status %s " | |
2826 | "(currently_stepping=%d).\n", | |
23fdd69e | 2827 | target_pid_to_str (tp->ptid), statstr.c_str (), |
372316f1 | 2828 | currently_stepping (tp)); |
372316f1 PA |
2829 | } |
2830 | } | |
2831 | ||
70509625 PA |
2832 | /* If this signal should not be seen by program, give it zero. |
2833 | Used for debugging signals. */ | |
2834 | if (!signal_pass_state (tp->suspend.stop_signal)) | |
2835 | tp->suspend.stop_signal = GDB_SIGNAL_0; | |
2836 | ||
243a9253 PA |
2837 | thread_fsm_delete (tp->thread_fsm); |
2838 | tp->thread_fsm = NULL; | |
2839 | ||
16c381f0 JK |
2840 | tp->control.trap_expected = 0; |
2841 | tp->control.step_range_start = 0; | |
2842 | tp->control.step_range_end = 0; | |
c1e36e3e | 2843 | tp->control.may_range_step = 0; |
16c381f0 JK |
2844 | tp->control.step_frame_id = null_frame_id; |
2845 | tp->control.step_stack_frame_id = null_frame_id; | |
2846 | tp->control.step_over_calls = STEP_OVER_UNDEBUGGABLE; | |
885eeb5b | 2847 | tp->control.step_start_function = NULL; |
a7212384 | 2848 | tp->stop_requested = 0; |
4e1c45ea | 2849 | |
16c381f0 | 2850 | tp->control.stop_step = 0; |
32400beb | 2851 | |
16c381f0 | 2852 | tp->control.proceed_to_finish = 0; |
414c69f7 | 2853 | |
856e7dd6 | 2854 | tp->control.stepping_command = 0; |
17b2616c | 2855 | |
a7212384 | 2856 | /* Discard any remaining commands or status from previous stop. */ |
16c381f0 | 2857 | bpstat_clear (&tp->control.stop_bpstat); |
a7212384 | 2858 | } |
32400beb | 2859 | |
a7212384 | 2860 | void |
70509625 | 2861 | clear_proceed_status (int step) |
a7212384 | 2862 | { |
f2665db5 MM |
2863 | /* With scheduler-locking replay, stop replaying other threads if we're |
2864 | not replaying the user-visible resume ptid. | |
2865 | ||
2866 | This is a convenience feature to not require the user to explicitly | |
2867 | stop replaying the other threads. We're assuming that the user's | |
2868 | intent is to resume tracing the recorded process. */ | |
2869 | if (!non_stop && scheduler_mode == schedlock_replay | |
2870 | && target_record_is_replaying (minus_one_ptid) | |
2871 | && !target_record_will_replay (user_visible_resume_ptid (step), | |
2872 | execution_direction)) | |
2873 | target_record_stop_replaying (); | |
2874 | ||
6c95b8df PA |
2875 | if (!non_stop) |
2876 | { | |
70509625 PA |
2877 | struct thread_info *tp; |
2878 | ptid_t resume_ptid; | |
2879 | ||
2880 | resume_ptid = user_visible_resume_ptid (step); | |
2881 | ||
2882 | /* In all-stop mode, delete the per-thread status of all threads | |
2883 | we're about to resume, implicitly and explicitly. */ | |
2884 | ALL_NON_EXITED_THREADS (tp) | |
2885 | { | |
2886 | if (!ptid_match (tp->ptid, resume_ptid)) | |
2887 | continue; | |
2888 | clear_proceed_status_thread (tp); | |
2889 | } | |
6c95b8df PA |
2890 | } |
2891 | ||
a7212384 UW |
2892 | if (!ptid_equal (inferior_ptid, null_ptid)) |
2893 | { | |
2894 | struct inferior *inferior; | |
2895 | ||
2896 | if (non_stop) | |
2897 | { | |
6c95b8df PA |
2898 | /* If in non-stop mode, only delete the per-thread status of |
2899 | the current thread. */ | |
a7212384 UW |
2900 | clear_proceed_status_thread (inferior_thread ()); |
2901 | } | |
6c95b8df | 2902 | |
d6b48e9c | 2903 | inferior = current_inferior (); |
16c381f0 | 2904 | inferior->control.stop_soon = NO_STOP_QUIETLY; |
4e1c45ea PA |
2905 | } |
2906 | ||
f3b1572e | 2907 | observer_notify_about_to_proceed (); |
c906108c SS |
2908 | } |
2909 | ||
99619bea PA |
2910 | /* Returns true if TP is still stopped at a breakpoint that needs |
2911 | stepping-over in order to make progress. If the breakpoint is gone | |
2912 | meanwhile, we can skip the whole step-over dance. */ | |
ea67f13b DJ |
2913 | |
2914 | static int | |
6c4cfb24 | 2915 | thread_still_needs_step_over_bp (struct thread_info *tp) |
99619bea PA |
2916 | { |
2917 | if (tp->stepping_over_breakpoint) | |
2918 | { | |
2919 | struct regcache *regcache = get_thread_regcache (tp->ptid); | |
2920 | ||
2921 | if (breakpoint_here_p (get_regcache_aspace (regcache), | |
af48d08f PA |
2922 | regcache_read_pc (regcache)) |
2923 | == ordinary_breakpoint_here) | |
99619bea PA |
2924 | return 1; |
2925 | ||
2926 | tp->stepping_over_breakpoint = 0; | |
2927 | } | |
2928 | ||
2929 | return 0; | |
2930 | } | |
2931 | ||
6c4cfb24 PA |
2932 | /* Check whether thread TP still needs to start a step-over in order |
2933 | to make progress when resumed. Returns an bitwise or of enum | |
2934 | step_over_what bits, indicating what needs to be stepped over. */ | |
2935 | ||
8d297bbf | 2936 | static step_over_what |
6c4cfb24 PA |
2937 | thread_still_needs_step_over (struct thread_info *tp) |
2938 | { | |
8d297bbf | 2939 | step_over_what what = 0; |
6c4cfb24 PA |
2940 | |
2941 | if (thread_still_needs_step_over_bp (tp)) | |
2942 | what |= STEP_OVER_BREAKPOINT; | |
2943 | ||
2944 | if (tp->stepping_over_watchpoint | |
2945 | && !target_have_steppable_watchpoint) | |
2946 | what |= STEP_OVER_WATCHPOINT; | |
2947 | ||
2948 | return what; | |
2949 | } | |
2950 | ||
483805cf PA |
2951 | /* Returns true if scheduler locking applies. STEP indicates whether |
2952 | we're about to do a step/next-like command to a thread. */ | |
2953 | ||
2954 | static int | |
856e7dd6 | 2955 | schedlock_applies (struct thread_info *tp) |
483805cf PA |
2956 | { |
2957 | return (scheduler_mode == schedlock_on | |
2958 | || (scheduler_mode == schedlock_step | |
f2665db5 MM |
2959 | && tp->control.stepping_command) |
2960 | || (scheduler_mode == schedlock_replay | |
2961 | && target_record_will_replay (minus_one_ptid, | |
2962 | execution_direction))); | |
483805cf PA |
2963 | } |
2964 | ||
c906108c SS |
2965 | /* Basic routine for continuing the program in various fashions. |
2966 | ||
2967 | ADDR is the address to resume at, or -1 for resume where stopped. | |
2968 | SIGGNAL is the signal to give it, or 0 for none, | |
c5aa993b | 2969 | or -1 for act according to how it stopped. |
c906108c | 2970 | STEP is nonzero if should trap after one instruction. |
c5aa993b JM |
2971 | -1 means return after that and print nothing. |
2972 | You should probably set various step_... variables | |
2973 | before calling here, if you are stepping. | |
c906108c SS |
2974 | |
2975 | You should call clear_proceed_status before calling proceed. */ | |
2976 | ||
2977 | void | |
64ce06e4 | 2978 | proceed (CORE_ADDR addr, enum gdb_signal siggnal) |
c906108c | 2979 | { |
e58b0e63 PA |
2980 | struct regcache *regcache; |
2981 | struct gdbarch *gdbarch; | |
4e1c45ea | 2982 | struct thread_info *tp; |
e58b0e63 | 2983 | CORE_ADDR pc; |
6c95b8df | 2984 | struct address_space *aspace; |
4d9d9d04 PA |
2985 | ptid_t resume_ptid; |
2986 | struct execution_control_state ecss; | |
2987 | struct execution_control_state *ecs = &ecss; | |
2988 | struct cleanup *old_chain; | |
2989 | int started; | |
c906108c | 2990 | |
e58b0e63 PA |
2991 | /* If we're stopped at a fork/vfork, follow the branch set by the |
2992 | "set follow-fork-mode" command; otherwise, we'll just proceed | |
2993 | resuming the current thread. */ | |
2994 | if (!follow_fork ()) | |
2995 | { | |
2996 | /* The target for some reason decided not to resume. */ | |
2997 | normal_stop (); | |
f148b27e PA |
2998 | if (target_can_async_p ()) |
2999 | inferior_event_handler (INF_EXEC_COMPLETE, NULL); | |
e58b0e63 PA |
3000 | return; |
3001 | } | |
3002 | ||
842951eb PA |
3003 | /* We'll update this if & when we switch to a new thread. */ |
3004 | previous_inferior_ptid = inferior_ptid; | |
3005 | ||
e58b0e63 PA |
3006 | regcache = get_current_regcache (); |
3007 | gdbarch = get_regcache_arch (regcache); | |
6c95b8df | 3008 | aspace = get_regcache_aspace (regcache); |
e58b0e63 | 3009 | pc = regcache_read_pc (regcache); |
2adfaa28 | 3010 | tp = inferior_thread (); |
e58b0e63 | 3011 | |
99619bea PA |
3012 | /* Fill in with reasonable starting values. */ |
3013 | init_thread_stepping_state (tp); | |
3014 | ||
c2829269 PA |
3015 | gdb_assert (!thread_is_in_step_over_chain (tp)); |
3016 | ||
2acceee2 | 3017 | if (addr == (CORE_ADDR) -1) |
c906108c | 3018 | { |
af48d08f PA |
3019 | if (pc == stop_pc |
3020 | && breakpoint_here_p (aspace, pc) == ordinary_breakpoint_here | |
b2175913 | 3021 | && execution_direction != EXEC_REVERSE) |
3352ef37 AC |
3022 | /* There is a breakpoint at the address we will resume at, |
3023 | step one instruction before inserting breakpoints so that | |
3024 | we do not stop right away (and report a second hit at this | |
b2175913 MS |
3025 | breakpoint). |
3026 | ||
3027 | Note, we don't do this in reverse, because we won't | |
3028 | actually be executing the breakpoint insn anyway. | |
3029 | We'll be (un-)executing the previous instruction. */ | |
99619bea | 3030 | tp->stepping_over_breakpoint = 1; |
515630c5 UW |
3031 | else if (gdbarch_single_step_through_delay_p (gdbarch) |
3032 | && gdbarch_single_step_through_delay (gdbarch, | |
3033 | get_current_frame ())) | |
3352ef37 AC |
3034 | /* We stepped onto an instruction that needs to be stepped |
3035 | again before re-inserting the breakpoint, do so. */ | |
99619bea | 3036 | tp->stepping_over_breakpoint = 1; |
c906108c SS |
3037 | } |
3038 | else | |
3039 | { | |
515630c5 | 3040 | regcache_write_pc (regcache, addr); |
c906108c SS |
3041 | } |
3042 | ||
70509625 PA |
3043 | if (siggnal != GDB_SIGNAL_DEFAULT) |
3044 | tp->suspend.stop_signal = siggnal; | |
3045 | ||
4d9d9d04 PA |
3046 | resume_ptid = user_visible_resume_ptid (tp->control.stepping_command); |
3047 | ||
3048 | /* If an exception is thrown from this point on, make sure to | |
3049 | propagate GDB's knowledge of the executing state to the | |
3050 | frontend/user running state. */ | |
3051 | old_chain = make_cleanup (finish_thread_state_cleanup, &resume_ptid); | |
3052 | ||
3053 | /* Even if RESUME_PTID is a wildcard, and we end up resuming fewer | |
3054 | threads (e.g., we might need to set threads stepping over | |
3055 | breakpoints first), from the user/frontend's point of view, all | |
3056 | threads in RESUME_PTID are now running. Unless we're calling an | |
3057 | inferior function, as in that case we pretend the inferior | |
3058 | doesn't run at all. */ | |
3059 | if (!tp->control.in_infcall) | |
3060 | set_running (resume_ptid, 1); | |
17b2616c | 3061 | |
527159b7 | 3062 | if (debug_infrun) |
8a9de0e4 | 3063 | fprintf_unfiltered (gdb_stdlog, |
64ce06e4 | 3064 | "infrun: proceed (addr=%s, signal=%s)\n", |
c9737c08 | 3065 | paddress (gdbarch, addr), |
64ce06e4 | 3066 | gdb_signal_to_symbol_string (siggnal)); |
527159b7 | 3067 | |
4d9d9d04 PA |
3068 | annotate_starting (); |
3069 | ||
3070 | /* Make sure that output from GDB appears before output from the | |
3071 | inferior. */ | |
3072 | gdb_flush (gdb_stdout); | |
3073 | ||
3074 | /* In a multi-threaded task we may select another thread and | |
3075 | then continue or step. | |
3076 | ||
3077 | But if a thread that we're resuming had stopped at a breakpoint, | |
3078 | it will immediately cause another breakpoint stop without any | |
3079 | execution (i.e. it will report a breakpoint hit incorrectly). So | |
3080 | we must step over it first. | |
3081 | ||
3082 | Look for threads other than the current (TP) that reported a | |
3083 | breakpoint hit and haven't been resumed yet since. */ | |
3084 | ||
3085 | /* If scheduler locking applies, we can avoid iterating over all | |
3086 | threads. */ | |
3087 | if (!non_stop && !schedlock_applies (tp)) | |
94cc34af | 3088 | { |
4d9d9d04 PA |
3089 | struct thread_info *current = tp; |
3090 | ||
3091 | ALL_NON_EXITED_THREADS (tp) | |
3092 | { | |
3093 | /* Ignore the current thread here. It's handled | |
3094 | afterwards. */ | |
3095 | if (tp == current) | |
3096 | continue; | |
99619bea | 3097 | |
4d9d9d04 PA |
3098 | /* Ignore threads of processes we're not resuming. */ |
3099 | if (!ptid_match (tp->ptid, resume_ptid)) | |
3100 | continue; | |
c906108c | 3101 | |
4d9d9d04 PA |
3102 | if (!thread_still_needs_step_over (tp)) |
3103 | continue; | |
3104 | ||
3105 | gdb_assert (!thread_is_in_step_over_chain (tp)); | |
c906108c | 3106 | |
99619bea PA |
3107 | if (debug_infrun) |
3108 | fprintf_unfiltered (gdb_stdlog, | |
3109 | "infrun: need to step-over [%s] first\n", | |
4d9d9d04 | 3110 | target_pid_to_str (tp->ptid)); |
99619bea | 3111 | |
4d9d9d04 | 3112 | thread_step_over_chain_enqueue (tp); |
2adfaa28 | 3113 | } |
31e77af2 | 3114 | |
4d9d9d04 | 3115 | tp = current; |
30852783 UW |
3116 | } |
3117 | ||
4d9d9d04 PA |
3118 | /* Enqueue the current thread last, so that we move all other |
3119 | threads over their breakpoints first. */ | |
3120 | if (tp->stepping_over_breakpoint) | |
3121 | thread_step_over_chain_enqueue (tp); | |
30852783 | 3122 | |
4d9d9d04 PA |
3123 | /* If the thread isn't started, we'll still need to set its prev_pc, |
3124 | so that switch_back_to_stepped_thread knows the thread hasn't | |
3125 | advanced. Must do this before resuming any thread, as in | |
3126 | all-stop/remote, once we resume we can't send any other packet | |
3127 | until the target stops again. */ | |
3128 | tp->prev_pc = regcache_read_pc (regcache); | |
99619bea | 3129 | |
a9bc57b9 TT |
3130 | { |
3131 | scoped_restore save_defer_tc = make_scoped_defer_target_commit_resume (); | |
85ad3aaf | 3132 | |
a9bc57b9 | 3133 | started = start_step_over (); |
c906108c | 3134 | |
a9bc57b9 TT |
3135 | if (step_over_info_valid_p ()) |
3136 | { | |
3137 | /* Either this thread started a new in-line step over, or some | |
3138 | other thread was already doing one. In either case, don't | |
3139 | resume anything else until the step-over is finished. */ | |
3140 | } | |
3141 | else if (started && !target_is_non_stop_p ()) | |
3142 | { | |
3143 | /* A new displaced stepping sequence was started. In all-stop, | |
3144 | we can't talk to the target anymore until it next stops. */ | |
3145 | } | |
3146 | else if (!non_stop && target_is_non_stop_p ()) | |
3147 | { | |
3148 | /* In all-stop, but the target is always in non-stop mode. | |
3149 | Start all other threads that are implicitly resumed too. */ | |
3150 | ALL_NON_EXITED_THREADS (tp) | |
fbea99ea PA |
3151 | { |
3152 | /* Ignore threads of processes we're not resuming. */ | |
3153 | if (!ptid_match (tp->ptid, resume_ptid)) | |
3154 | continue; | |
3155 | ||
3156 | if (tp->resumed) | |
3157 | { | |
3158 | if (debug_infrun) | |
3159 | fprintf_unfiltered (gdb_stdlog, | |
3160 | "infrun: proceed: [%s] resumed\n", | |
3161 | target_pid_to_str (tp->ptid)); | |
3162 | gdb_assert (tp->executing || tp->suspend.waitstatus_pending_p); | |
3163 | continue; | |
3164 | } | |
3165 | ||
3166 | if (thread_is_in_step_over_chain (tp)) | |
3167 | { | |
3168 | if (debug_infrun) | |
3169 | fprintf_unfiltered (gdb_stdlog, | |
3170 | "infrun: proceed: [%s] needs step-over\n", | |
3171 | target_pid_to_str (tp->ptid)); | |
3172 | continue; | |
3173 | } | |
3174 | ||
3175 | if (debug_infrun) | |
3176 | fprintf_unfiltered (gdb_stdlog, | |
3177 | "infrun: proceed: resuming %s\n", | |
3178 | target_pid_to_str (tp->ptid)); | |
3179 | ||
3180 | reset_ecs (ecs, tp); | |
3181 | switch_to_thread (tp->ptid); | |
3182 | keep_going_pass_signal (ecs); | |
3183 | if (!ecs->wait_some_more) | |
fd7dcb94 | 3184 | error (_("Command aborted.")); |
fbea99ea | 3185 | } |
a9bc57b9 TT |
3186 | } |
3187 | else if (!tp->resumed && !thread_is_in_step_over_chain (tp)) | |
3188 | { | |
3189 | /* The thread wasn't started, and isn't queued, run it now. */ | |
3190 | reset_ecs (ecs, tp); | |
3191 | switch_to_thread (tp->ptid); | |
3192 | keep_going_pass_signal (ecs); | |
3193 | if (!ecs->wait_some_more) | |
3194 | error (_("Command aborted.")); | |
3195 | } | |
3196 | } | |
c906108c | 3197 | |
85ad3aaf PA |
3198 | target_commit_resume (); |
3199 | ||
4d9d9d04 | 3200 | discard_cleanups (old_chain); |
c906108c | 3201 | |
0b333c5e PA |
3202 | /* Tell the event loop to wait for it to stop. If the target |
3203 | supports asynchronous execution, it'll do this from within | |
3204 | target_resume. */ | |
362646f5 | 3205 | if (!target_can_async_p ()) |
0b333c5e | 3206 | mark_async_event_handler (infrun_async_inferior_event_token); |
c906108c | 3207 | } |
c906108c SS |
3208 | \f |
3209 | ||
3210 | /* Start remote-debugging of a machine over a serial link. */ | |
96baa820 | 3211 | |
c906108c | 3212 | void |
8621d6a9 | 3213 | start_remote (int from_tty) |
c906108c | 3214 | { |
d6b48e9c | 3215 | struct inferior *inferior; |
d6b48e9c PA |
3216 | |
3217 | inferior = current_inferior (); | |
16c381f0 | 3218 | inferior->control.stop_soon = STOP_QUIETLY_REMOTE; |
43ff13b4 | 3219 | |
1777feb0 | 3220 | /* Always go on waiting for the target, regardless of the mode. */ |
6426a772 | 3221 | /* FIXME: cagney/1999-09-23: At present it isn't possible to |
7e73cedf | 3222 | indicate to wait_for_inferior that a target should timeout if |
6426a772 JM |
3223 | nothing is returned (instead of just blocking). Because of this, |
3224 | targets expecting an immediate response need to, internally, set | |
3225 | things up so that the target_wait() is forced to eventually | |
1777feb0 | 3226 | timeout. */ |
6426a772 JM |
3227 | /* FIXME: cagney/1999-09-24: It isn't possible for target_open() to |
3228 | differentiate to its caller what the state of the target is after | |
3229 | the initial open has been performed. Here we're assuming that | |
3230 | the target has stopped. It should be possible to eventually have | |
3231 | target_open() return to the caller an indication that the target | |
3232 | is currently running and GDB state should be set to the same as | |
1777feb0 | 3233 | for an async run. */ |
e4c8541f | 3234 | wait_for_inferior (); |
8621d6a9 DJ |
3235 | |
3236 | /* Now that the inferior has stopped, do any bookkeeping like | |
3237 | loading shared libraries. We want to do this before normal_stop, | |
3238 | so that the displayed frame is up to date. */ | |
3239 | post_create_inferior (¤t_target, from_tty); | |
3240 | ||
6426a772 | 3241 | normal_stop (); |
c906108c SS |
3242 | } |
3243 | ||
3244 | /* Initialize static vars when a new inferior begins. */ | |
3245 | ||
3246 | void | |
96baa820 | 3247 | init_wait_for_inferior (void) |
c906108c SS |
3248 | { |
3249 | /* These are meaningless until the first time through wait_for_inferior. */ | |
c906108c | 3250 | |
c906108c SS |
3251 | breakpoint_init_inferior (inf_starting); |
3252 | ||
70509625 | 3253 | clear_proceed_status (0); |
9f976b41 | 3254 | |
ca005067 | 3255 | target_last_wait_ptid = minus_one_ptid; |
237fc4c9 | 3256 | |
842951eb | 3257 | previous_inferior_ptid = inferior_ptid; |
0d1e5fa7 | 3258 | |
edb3359d DJ |
3259 | /* Discard any skipped inlined frames. */ |
3260 | clear_inline_frame_state (minus_one_ptid); | |
c906108c | 3261 | } |
237fc4c9 | 3262 | |
c906108c | 3263 | \f |
488f131b | 3264 | |
ec9499be | 3265 | static void handle_inferior_event (struct execution_control_state *ecs); |
cd0fc7c3 | 3266 | |
568d6575 UW |
3267 | static void handle_step_into_function (struct gdbarch *gdbarch, |
3268 | struct execution_control_state *ecs); | |
3269 | static void handle_step_into_function_backward (struct gdbarch *gdbarch, | |
3270 | struct execution_control_state *ecs); | |
4f5d7f63 | 3271 | static void handle_signal_stop (struct execution_control_state *ecs); |
186c406b | 3272 | static void check_exception_resume (struct execution_control_state *, |
28106bc2 | 3273 | struct frame_info *); |
611c83ae | 3274 | |
bdc36728 | 3275 | static void end_stepping_range (struct execution_control_state *ecs); |
22bcd14b | 3276 | static void stop_waiting (struct execution_control_state *ecs); |
d4f3574e | 3277 | static void keep_going (struct execution_control_state *ecs); |
94c57d6a | 3278 | static void process_event_stop_test (struct execution_control_state *ecs); |
c447ac0b | 3279 | static int switch_back_to_stepped_thread (struct execution_control_state *ecs); |
104c1213 | 3280 | |
252fbfc8 PA |
3281 | /* This function is attached as a "thread_stop_requested" observer. |
3282 | Cleanup local state that assumed the PTID was to be resumed, and | |
3283 | report the stop to the frontend. */ | |
3284 | ||
2c0b251b | 3285 | static void |
252fbfc8 PA |
3286 | infrun_thread_stop_requested (ptid_t ptid) |
3287 | { | |
c2829269 | 3288 | struct thread_info *tp; |
252fbfc8 | 3289 | |
c65d6b55 PA |
3290 | /* PTID was requested to stop. If the thread was already stopped, |
3291 | but the user/frontend doesn't know about that yet (e.g., the | |
3292 | thread had been temporarily paused for some step-over), set up | |
3293 | for reporting the stop now. */ | |
c2829269 PA |
3294 | ALL_NON_EXITED_THREADS (tp) |
3295 | if (ptid_match (tp->ptid, ptid)) | |
3296 | { | |
c65d6b55 PA |
3297 | if (tp->state != THREAD_RUNNING) |
3298 | continue; | |
3299 | if (tp->executing) | |
3300 | continue; | |
3301 | ||
3302 | /* Remove matching threads from the step-over queue, so | |
3303 | start_step_over doesn't try to resume them | |
3304 | automatically. */ | |
c2829269 PA |
3305 | if (thread_is_in_step_over_chain (tp)) |
3306 | thread_step_over_chain_remove (tp); | |
252fbfc8 | 3307 | |
c65d6b55 PA |
3308 | /* If the thread is stopped, but the user/frontend doesn't |
3309 | know about that yet, queue a pending event, as if the | |
3310 | thread had just stopped now. Unless the thread already had | |
3311 | a pending event. */ | |
3312 | if (!tp->suspend.waitstatus_pending_p) | |
3313 | { | |
3314 | tp->suspend.waitstatus_pending_p = 1; | |
3315 | tp->suspend.waitstatus.kind = TARGET_WAITKIND_STOPPED; | |
3316 | tp->suspend.waitstatus.value.sig = GDB_SIGNAL_0; | |
3317 | } | |
3318 | ||
3319 | /* Clear the inline-frame state, since we're re-processing the | |
3320 | stop. */ | |
3321 | clear_inline_frame_state (tp->ptid); | |
3322 | ||
3323 | /* If this thread was paused because some other thread was | |
3324 | doing an inline-step over, let that finish first. Once | |
3325 | that happens, we'll restart all threads and consume pending | |
3326 | stop events then. */ | |
3327 | if (step_over_info_valid_p ()) | |
3328 | continue; | |
3329 | ||
3330 | /* Otherwise we can process the (new) pending event now. Set | |
3331 | it so this pending event is considered by | |
3332 | do_target_wait. */ | |
3333 | tp->resumed = 1; | |
3334 | } | |
252fbfc8 PA |
3335 | } |
3336 | ||
a07daef3 PA |
3337 | static void |
3338 | infrun_thread_thread_exit (struct thread_info *tp, int silent) | |
3339 | { | |
3340 | if (ptid_equal (target_last_wait_ptid, tp->ptid)) | |
3341 | nullify_last_target_wait_ptid (); | |
3342 | } | |
3343 | ||
0cbcdb96 PA |
3344 | /* Delete the step resume, single-step and longjmp/exception resume |
3345 | breakpoints of TP. */ | |
4e1c45ea | 3346 | |
0cbcdb96 PA |
3347 | static void |
3348 | delete_thread_infrun_breakpoints (struct thread_info *tp) | |
4e1c45ea | 3349 | { |
0cbcdb96 PA |
3350 | delete_step_resume_breakpoint (tp); |
3351 | delete_exception_resume_breakpoint (tp); | |
34b7e8a6 | 3352 | delete_single_step_breakpoints (tp); |
4e1c45ea PA |
3353 | } |
3354 | ||
0cbcdb96 PA |
3355 | /* If the target still has execution, call FUNC for each thread that |
3356 | just stopped. In all-stop, that's all the non-exited threads; in | |
3357 | non-stop, that's the current thread, only. */ | |
3358 | ||
3359 | typedef void (*for_each_just_stopped_thread_callback_func) | |
3360 | (struct thread_info *tp); | |
4e1c45ea PA |
3361 | |
3362 | static void | |
0cbcdb96 | 3363 | for_each_just_stopped_thread (for_each_just_stopped_thread_callback_func func) |
4e1c45ea | 3364 | { |
0cbcdb96 | 3365 | if (!target_has_execution || ptid_equal (inferior_ptid, null_ptid)) |
4e1c45ea PA |
3366 | return; |
3367 | ||
fbea99ea | 3368 | if (target_is_non_stop_p ()) |
4e1c45ea | 3369 | { |
0cbcdb96 PA |
3370 | /* If in non-stop mode, only the current thread stopped. */ |
3371 | func (inferior_thread ()); | |
4e1c45ea PA |
3372 | } |
3373 | else | |
0cbcdb96 PA |
3374 | { |
3375 | struct thread_info *tp; | |
3376 | ||
3377 | /* In all-stop mode, all threads have stopped. */ | |
3378 | ALL_NON_EXITED_THREADS (tp) | |
3379 | { | |
3380 | func (tp); | |
3381 | } | |
3382 | } | |
3383 | } | |
3384 | ||
3385 | /* Delete the step resume and longjmp/exception resume breakpoints of | |
3386 | the threads that just stopped. */ | |
3387 | ||
3388 | static void | |
3389 | delete_just_stopped_threads_infrun_breakpoints (void) | |
3390 | { | |
3391 | for_each_just_stopped_thread (delete_thread_infrun_breakpoints); | |
34b7e8a6 PA |
3392 | } |
3393 | ||
3394 | /* Delete the single-step breakpoints of the threads that just | |
3395 | stopped. */ | |
7c16b83e | 3396 | |
34b7e8a6 PA |
3397 | static void |
3398 | delete_just_stopped_threads_single_step_breakpoints (void) | |
3399 | { | |
3400 | for_each_just_stopped_thread (delete_single_step_breakpoints); | |
4e1c45ea PA |
3401 | } |
3402 | ||
1777feb0 | 3403 | /* A cleanup wrapper. */ |
4e1c45ea PA |
3404 | |
3405 | static void | |
0cbcdb96 | 3406 | delete_just_stopped_threads_infrun_breakpoints_cleanup (void *arg) |
4e1c45ea | 3407 | { |
0cbcdb96 | 3408 | delete_just_stopped_threads_infrun_breakpoints (); |
4e1c45ea PA |
3409 | } |
3410 | ||
221e1a37 | 3411 | /* See infrun.h. */ |
223698f8 | 3412 | |
221e1a37 | 3413 | void |
223698f8 DE |
3414 | print_target_wait_results (ptid_t waiton_ptid, ptid_t result_ptid, |
3415 | const struct target_waitstatus *ws) | |
3416 | { | |
23fdd69e | 3417 | std::string status_string = target_waitstatus_to_string (ws); |
d7e74731 | 3418 | string_file stb; |
223698f8 DE |
3419 | |
3420 | /* The text is split over several lines because it was getting too long. | |
3421 | Call fprintf_unfiltered (gdb_stdlog) once so that the text is still | |
3422 | output as a unit; we want only one timestamp printed if debug_timestamp | |
3423 | is set. */ | |
3424 | ||
d7e74731 PA |
3425 | stb.printf ("infrun: target_wait (%d.%ld.%ld", |
3426 | ptid_get_pid (waiton_ptid), | |
3427 | ptid_get_lwp (waiton_ptid), | |
3428 | ptid_get_tid (waiton_ptid)); | |
dfd4cc63 | 3429 | if (ptid_get_pid (waiton_ptid) != -1) |
d7e74731 PA |
3430 | stb.printf (" [%s]", target_pid_to_str (waiton_ptid)); |
3431 | stb.printf (", status) =\n"); | |
3432 | stb.printf ("infrun: %d.%ld.%ld [%s],\n", | |
3433 | ptid_get_pid (result_ptid), | |
3434 | ptid_get_lwp (result_ptid), | |
3435 | ptid_get_tid (result_ptid), | |
3436 | target_pid_to_str (result_ptid)); | |
23fdd69e | 3437 | stb.printf ("infrun: %s\n", status_string.c_str ()); |
223698f8 DE |
3438 | |
3439 | /* This uses %s in part to handle %'s in the text, but also to avoid | |
3440 | a gcc error: the format attribute requires a string literal. */ | |
d7e74731 | 3441 | fprintf_unfiltered (gdb_stdlog, "%s", stb.c_str ()); |
223698f8 DE |
3442 | } |
3443 | ||
372316f1 PA |
3444 | /* Select a thread at random, out of those which are resumed and have |
3445 | had events. */ | |
3446 | ||
3447 | static struct thread_info * | |
3448 | random_pending_event_thread (ptid_t waiton_ptid) | |
3449 | { | |
3450 | struct thread_info *event_tp; | |
3451 | int num_events = 0; | |
3452 | int random_selector; | |
3453 | ||
3454 | /* First see how many events we have. Count only resumed threads | |
3455 | that have an event pending. */ | |
3456 | ALL_NON_EXITED_THREADS (event_tp) | |
3457 | if (ptid_match (event_tp->ptid, waiton_ptid) | |
3458 | && event_tp->resumed | |
3459 | && event_tp->suspend.waitstatus_pending_p) | |
3460 | num_events++; | |
3461 | ||
3462 | if (num_events == 0) | |
3463 | return NULL; | |
3464 | ||
3465 | /* Now randomly pick a thread out of those that have had events. */ | |
3466 | random_selector = (int) | |
3467 | ((num_events * (double) rand ()) / (RAND_MAX + 1.0)); | |
3468 | ||
3469 | if (debug_infrun && num_events > 1) | |
3470 | fprintf_unfiltered (gdb_stdlog, | |
3471 | "infrun: Found %d events, selecting #%d\n", | |
3472 | num_events, random_selector); | |
3473 | ||
3474 | /* Select the Nth thread that has had an event. */ | |
3475 | ALL_NON_EXITED_THREADS (event_tp) | |
3476 | if (ptid_match (event_tp->ptid, waiton_ptid) | |
3477 | && event_tp->resumed | |
3478 | && event_tp->suspend.waitstatus_pending_p) | |
3479 | if (random_selector-- == 0) | |
3480 | break; | |
3481 | ||
3482 | return event_tp; | |
3483 | } | |
3484 | ||
3485 | /* Wrapper for target_wait that first checks whether threads have | |
3486 | pending statuses to report before actually asking the target for | |
3487 | more events. */ | |
3488 | ||
3489 | static ptid_t | |
3490 | do_target_wait (ptid_t ptid, struct target_waitstatus *status, int options) | |
3491 | { | |
3492 | ptid_t event_ptid; | |
3493 | struct thread_info *tp; | |
3494 | ||
3495 | /* First check if there is a resumed thread with a wait status | |
3496 | pending. */ | |
3497 | if (ptid_equal (ptid, minus_one_ptid) || ptid_is_pid (ptid)) | |
3498 | { | |
3499 | tp = random_pending_event_thread (ptid); | |
3500 | } | |
3501 | else | |
3502 | { | |
3503 | if (debug_infrun) | |
3504 | fprintf_unfiltered (gdb_stdlog, | |
3505 | "infrun: Waiting for specific thread %s.\n", | |
3506 | target_pid_to_str (ptid)); | |
3507 | ||
3508 | /* We have a specific thread to check. */ | |
3509 | tp = find_thread_ptid (ptid); | |
3510 | gdb_assert (tp != NULL); | |
3511 | if (!tp->suspend.waitstatus_pending_p) | |
3512 | tp = NULL; | |
3513 | } | |
3514 | ||
3515 | if (tp != NULL | |
3516 | && (tp->suspend.stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT | |
3517 | || tp->suspend.stop_reason == TARGET_STOPPED_BY_HW_BREAKPOINT)) | |
3518 | { | |
3519 | struct regcache *regcache = get_thread_regcache (tp->ptid); | |
3520 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
3521 | CORE_ADDR pc; | |
3522 | int discard = 0; | |
3523 | ||
3524 | pc = regcache_read_pc (regcache); | |
3525 | ||
3526 | if (pc != tp->suspend.stop_pc) | |
3527 | { | |
3528 | if (debug_infrun) | |
3529 | fprintf_unfiltered (gdb_stdlog, | |
3530 | "infrun: PC of %s changed. was=%s, now=%s\n", | |
3531 | target_pid_to_str (tp->ptid), | |
3532 | paddress (gdbarch, tp->prev_pc), | |
3533 | paddress (gdbarch, pc)); | |
3534 | discard = 1; | |
3535 | } | |
3536 | else if (!breakpoint_inserted_here_p (get_regcache_aspace (regcache), pc)) | |
3537 | { | |
3538 | if (debug_infrun) | |
3539 | fprintf_unfiltered (gdb_stdlog, | |
3540 | "infrun: previous breakpoint of %s, at %s gone\n", | |
3541 | target_pid_to_str (tp->ptid), | |
3542 | paddress (gdbarch, pc)); | |
3543 | ||
3544 | discard = 1; | |
3545 | } | |
3546 | ||
3547 | if (discard) | |
3548 | { | |
3549 | if (debug_infrun) | |
3550 | fprintf_unfiltered (gdb_stdlog, | |
3551 | "infrun: pending event of %s cancelled.\n", | |
3552 | target_pid_to_str (tp->ptid)); | |
3553 | ||
3554 | tp->suspend.waitstatus.kind = TARGET_WAITKIND_SPURIOUS; | |
3555 | tp->suspend.stop_reason = TARGET_STOPPED_BY_NO_REASON; | |
3556 | } | |
3557 | } | |
3558 | ||
3559 | if (tp != NULL) | |
3560 | { | |
3561 | if (debug_infrun) | |
3562 | { | |
23fdd69e SM |
3563 | std::string statstr |
3564 | = target_waitstatus_to_string (&tp->suspend.waitstatus); | |
372316f1 | 3565 | |
372316f1 PA |
3566 | fprintf_unfiltered (gdb_stdlog, |
3567 | "infrun: Using pending wait status %s for %s.\n", | |
23fdd69e | 3568 | statstr.c_str (), |
372316f1 | 3569 | target_pid_to_str (tp->ptid)); |
372316f1 PA |
3570 | } |
3571 | ||
3572 | /* Now that we've selected our final event LWP, un-adjust its PC | |
3573 | if it was a software breakpoint (and the target doesn't | |
3574 | always adjust the PC itself). */ | |
3575 | if (tp->suspend.stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT | |
3576 | && !target_supports_stopped_by_sw_breakpoint ()) | |
3577 | { | |
3578 | struct regcache *regcache; | |
3579 | struct gdbarch *gdbarch; | |
3580 | int decr_pc; | |
3581 | ||
3582 | regcache = get_thread_regcache (tp->ptid); | |
3583 | gdbarch = get_regcache_arch (regcache); | |
3584 | ||
3585 | decr_pc = gdbarch_decr_pc_after_break (gdbarch); | |
3586 | if (decr_pc != 0) | |
3587 | { | |
3588 | CORE_ADDR pc; | |
3589 | ||
3590 | pc = regcache_read_pc (regcache); | |
3591 | regcache_write_pc (regcache, pc + decr_pc); | |
3592 | } | |
3593 | } | |
3594 | ||
3595 | tp->suspend.stop_reason = TARGET_STOPPED_BY_NO_REASON; | |
3596 | *status = tp->suspend.waitstatus; | |
3597 | tp->suspend.waitstatus_pending_p = 0; | |
3598 | ||
3599 | /* Wake up the event loop again, until all pending events are | |
3600 | processed. */ | |
3601 | if (target_is_async_p ()) | |
3602 | mark_async_event_handler (infrun_async_inferior_event_token); | |
3603 | return tp->ptid; | |
3604 | } | |
3605 | ||
3606 | /* But if we don't find one, we'll have to wait. */ | |
3607 | ||
3608 | if (deprecated_target_wait_hook) | |
3609 | event_ptid = deprecated_target_wait_hook (ptid, status, options); | |
3610 | else | |
3611 | event_ptid = target_wait (ptid, status, options); | |
3612 | ||
3613 | return event_ptid; | |
3614 | } | |
3615 | ||
24291992 PA |
3616 | /* Prepare and stabilize the inferior for detaching it. E.g., |
3617 | detaching while a thread is displaced stepping is a recipe for | |
3618 | crashing it, as nothing would readjust the PC out of the scratch | |
3619 | pad. */ | |
3620 | ||
3621 | void | |
3622 | prepare_for_detach (void) | |
3623 | { | |
3624 | struct inferior *inf = current_inferior (); | |
3625 | ptid_t pid_ptid = pid_to_ptid (inf->pid); | |
24291992 PA |
3626 | struct displaced_step_inferior_state *displaced; |
3627 | ||
3628 | displaced = get_displaced_stepping_state (inf->pid); | |
3629 | ||
3630 | /* Is any thread of this process displaced stepping? If not, | |
3631 | there's nothing else to do. */ | |
3632 | if (displaced == NULL || ptid_equal (displaced->step_ptid, null_ptid)) | |
3633 | return; | |
3634 | ||
3635 | if (debug_infrun) | |
3636 | fprintf_unfiltered (gdb_stdlog, | |
3637 | "displaced-stepping in-process while detaching"); | |
3638 | ||
9bcb1f16 | 3639 | scoped_restore restore_detaching = make_scoped_restore (&inf->detaching, true); |
24291992 PA |
3640 | |
3641 | while (!ptid_equal (displaced->step_ptid, null_ptid)) | |
3642 | { | |
3643 | struct cleanup *old_chain_2; | |
3644 | struct execution_control_state ecss; | |
3645 | struct execution_control_state *ecs; | |
3646 | ||
3647 | ecs = &ecss; | |
3648 | memset (ecs, 0, sizeof (*ecs)); | |
3649 | ||
3650 | overlay_cache_invalid = 1; | |
f15cb84a YQ |
3651 | /* Flush target cache before starting to handle each event. |
3652 | Target was running and cache could be stale. This is just a | |
3653 | heuristic. Running threads may modify target memory, but we | |
3654 | don't get any event. */ | |
3655 | target_dcache_invalidate (); | |
24291992 | 3656 | |
372316f1 | 3657 | ecs->ptid = do_target_wait (pid_ptid, &ecs->ws, 0); |
24291992 PA |
3658 | |
3659 | if (debug_infrun) | |
3660 | print_target_wait_results (pid_ptid, ecs->ptid, &ecs->ws); | |
3661 | ||
3662 | /* If an error happens while handling the event, propagate GDB's | |
3663 | knowledge of the executing state to the frontend/user running | |
3664 | state. */ | |
3e43a32a MS |
3665 | old_chain_2 = make_cleanup (finish_thread_state_cleanup, |
3666 | &minus_one_ptid); | |
24291992 PA |
3667 | |
3668 | /* Now figure out what to do with the result of the result. */ | |
3669 | handle_inferior_event (ecs); | |
3670 | ||
3671 | /* No error, don't finish the state yet. */ | |
3672 | discard_cleanups (old_chain_2); | |
3673 | ||
3674 | /* Breakpoints and watchpoints are not installed on the target | |
3675 | at this point, and signals are passed directly to the | |
3676 | inferior, so this must mean the process is gone. */ | |
3677 | if (!ecs->wait_some_more) | |
3678 | { | |
9bcb1f16 | 3679 | restore_detaching.release (); |
24291992 PA |
3680 | error (_("Program exited while detaching")); |
3681 | } | |
3682 | } | |
3683 | ||
9bcb1f16 | 3684 | restore_detaching.release (); |
24291992 PA |
3685 | } |
3686 | ||
cd0fc7c3 | 3687 | /* Wait for control to return from inferior to debugger. |
ae123ec6 | 3688 | |
cd0fc7c3 SS |
3689 | If inferior gets a signal, we may decide to start it up again |
3690 | instead of returning. That is why there is a loop in this function. | |
3691 | When this function actually returns it means the inferior | |
3692 | should be left stopped and GDB should read more commands. */ | |
3693 | ||
3694 | void | |
e4c8541f | 3695 | wait_for_inferior (void) |
cd0fc7c3 SS |
3696 | { |
3697 | struct cleanup *old_cleanups; | |
e6f5c25b | 3698 | struct cleanup *thread_state_chain; |
c906108c | 3699 | |
527159b7 | 3700 | if (debug_infrun) |
ae123ec6 | 3701 | fprintf_unfiltered |
e4c8541f | 3702 | (gdb_stdlog, "infrun: wait_for_inferior ()\n"); |
527159b7 | 3703 | |
0cbcdb96 PA |
3704 | old_cleanups |
3705 | = make_cleanup (delete_just_stopped_threads_infrun_breakpoints_cleanup, | |
3706 | NULL); | |
cd0fc7c3 | 3707 | |
e6f5c25b PA |
3708 | /* If an error happens while handling the event, propagate GDB's |
3709 | knowledge of the executing state to the frontend/user running | |
3710 | state. */ | |
3711 | thread_state_chain = make_cleanup (finish_thread_state_cleanup, &minus_one_ptid); | |
3712 | ||
c906108c SS |
3713 | while (1) |
3714 | { | |
ae25568b PA |
3715 | struct execution_control_state ecss; |
3716 | struct execution_control_state *ecs = &ecss; | |
963f9c80 | 3717 | ptid_t waiton_ptid = minus_one_ptid; |
29f49a6a | 3718 | |
ae25568b PA |
3719 | memset (ecs, 0, sizeof (*ecs)); |
3720 | ||
ec9499be | 3721 | overlay_cache_invalid = 1; |
ec9499be | 3722 | |
f15cb84a YQ |
3723 | /* Flush target cache before starting to handle each event. |
3724 | Target was running and cache could be stale. This is just a | |
3725 | heuristic. Running threads may modify target memory, but we | |
3726 | don't get any event. */ | |
3727 | target_dcache_invalidate (); | |
3728 | ||
372316f1 | 3729 | ecs->ptid = do_target_wait (waiton_ptid, &ecs->ws, 0); |
c906108c | 3730 | |
f00150c9 | 3731 | if (debug_infrun) |
223698f8 | 3732 | print_target_wait_results (waiton_ptid, ecs->ptid, &ecs->ws); |
f00150c9 | 3733 | |
cd0fc7c3 SS |
3734 | /* Now figure out what to do with the result of the result. */ |
3735 | handle_inferior_event (ecs); | |
c906108c | 3736 | |
cd0fc7c3 SS |
3737 | if (!ecs->wait_some_more) |
3738 | break; | |
3739 | } | |
4e1c45ea | 3740 | |
e6f5c25b PA |
3741 | /* No error, don't finish the state yet. */ |
3742 | discard_cleanups (thread_state_chain); | |
3743 | ||
cd0fc7c3 SS |
3744 | do_cleanups (old_cleanups); |
3745 | } | |
c906108c | 3746 | |
d3d4baed PA |
3747 | /* Cleanup that reinstalls the readline callback handler, if the |
3748 | target is running in the background. If while handling the target | |
3749 | event something triggered a secondary prompt, like e.g., a | |
3750 | pagination prompt, we'll have removed the callback handler (see | |
3751 | gdb_readline_wrapper_line). Need to do this as we go back to the | |
3752 | event loop, ready to process further input. Note this has no | |
3753 | effect if the handler hasn't actually been removed, because calling | |
3754 | rl_callback_handler_install resets the line buffer, thus losing | |
3755 | input. */ | |
3756 | ||
3757 | static void | |
3758 | reinstall_readline_callback_handler_cleanup (void *arg) | |
3759 | { | |
3b12939d PA |
3760 | struct ui *ui = current_ui; |
3761 | ||
3762 | if (!ui->async) | |
6c400b59 PA |
3763 | { |
3764 | /* We're not going back to the top level event loop yet. Don't | |
3765 | install the readline callback, as it'd prep the terminal, | |
3766 | readline-style (raw, noecho) (e.g., --batch). We'll install | |
3767 | it the next time the prompt is displayed, when we're ready | |
3768 | for input. */ | |
3769 | return; | |
3770 | } | |
3771 | ||
3b12939d | 3772 | if (ui->command_editing && ui->prompt_state != PROMPT_BLOCKED) |
d3d4baed PA |
3773 | gdb_rl_callback_handler_reinstall (); |
3774 | } | |
3775 | ||
243a9253 PA |
3776 | /* Clean up the FSMs of threads that are now stopped. In non-stop, |
3777 | that's just the event thread. In all-stop, that's all threads. */ | |
3778 | ||
3779 | static void | |
3780 | clean_up_just_stopped_threads_fsms (struct execution_control_state *ecs) | |
3781 | { | |
3782 | struct thread_info *thr = ecs->event_thread; | |
3783 | ||
3784 | if (thr != NULL && thr->thread_fsm != NULL) | |
8980e177 | 3785 | thread_fsm_clean_up (thr->thread_fsm, thr); |
243a9253 PA |
3786 | |
3787 | if (!non_stop) | |
3788 | { | |
3789 | ALL_NON_EXITED_THREADS (thr) | |
3790 | { | |
3791 | if (thr->thread_fsm == NULL) | |
3792 | continue; | |
3793 | if (thr == ecs->event_thread) | |
3794 | continue; | |
3795 | ||
3796 | switch_to_thread (thr->ptid); | |
8980e177 | 3797 | thread_fsm_clean_up (thr->thread_fsm, thr); |
243a9253 PA |
3798 | } |
3799 | ||
3800 | if (ecs->event_thread != NULL) | |
3801 | switch_to_thread (ecs->event_thread->ptid); | |
3802 | } | |
3803 | } | |
3804 | ||
3b12939d PA |
3805 | /* Helper for all_uis_check_sync_execution_done that works on the |
3806 | current UI. */ | |
3807 | ||
3808 | static void | |
3809 | check_curr_ui_sync_execution_done (void) | |
3810 | { | |
3811 | struct ui *ui = current_ui; | |
3812 | ||
3813 | if (ui->prompt_state == PROMPT_NEEDED | |
3814 | && ui->async | |
3815 | && !gdb_in_secondary_prompt_p (ui)) | |
3816 | { | |
223ffa71 | 3817 | target_terminal::ours (); |
3b12939d | 3818 | observer_notify_sync_execution_done (); |
3eb7562a | 3819 | ui_register_input_event_handler (ui); |
3b12939d PA |
3820 | } |
3821 | } | |
3822 | ||
3823 | /* See infrun.h. */ | |
3824 | ||
3825 | void | |
3826 | all_uis_check_sync_execution_done (void) | |
3827 | { | |
0e454242 | 3828 | SWITCH_THRU_ALL_UIS () |
3b12939d PA |
3829 | { |
3830 | check_curr_ui_sync_execution_done (); | |
3831 | } | |
3832 | } | |
3833 | ||
a8836c93 PA |
3834 | /* See infrun.h. */ |
3835 | ||
3836 | void | |
3837 | all_uis_on_sync_execution_starting (void) | |
3838 | { | |
0e454242 | 3839 | SWITCH_THRU_ALL_UIS () |
a8836c93 PA |
3840 | { |
3841 | if (current_ui->prompt_state == PROMPT_NEEDED) | |
3842 | async_disable_stdin (); | |
3843 | } | |
3844 | } | |
3845 | ||
1777feb0 | 3846 | /* Asynchronous version of wait_for_inferior. It is called by the |
43ff13b4 | 3847 | event loop whenever a change of state is detected on the file |
1777feb0 MS |
3848 | descriptor corresponding to the target. It can be called more than |
3849 | once to complete a single execution command. In such cases we need | |
3850 | to keep the state in a global variable ECSS. If it is the last time | |
a474d7c2 PA |
3851 | that this function is called for a single execution command, then |
3852 | report to the user that the inferior has stopped, and do the | |
1777feb0 | 3853 | necessary cleanups. */ |
43ff13b4 JM |
3854 | |
3855 | void | |
fba45db2 | 3856 | fetch_inferior_event (void *client_data) |
43ff13b4 | 3857 | { |
0d1e5fa7 | 3858 | struct execution_control_state ecss; |
a474d7c2 | 3859 | struct execution_control_state *ecs = &ecss; |
4f8d22e3 | 3860 | struct cleanup *old_chain = make_cleanup (null_cleanup, NULL); |
29f49a6a | 3861 | struct cleanup *ts_old_chain; |
0f641c01 | 3862 | int cmd_done = 0; |
963f9c80 | 3863 | ptid_t waiton_ptid = minus_one_ptid; |
43ff13b4 | 3864 | |
0d1e5fa7 PA |
3865 | memset (ecs, 0, sizeof (*ecs)); |
3866 | ||
c61db772 PA |
3867 | /* Events are always processed with the main UI as current UI. This |
3868 | way, warnings, debug output, etc. are always consistently sent to | |
3869 | the main console. */ | |
4b6749b9 | 3870 | scoped_restore save_ui = make_scoped_restore (¤t_ui, main_ui); |
c61db772 | 3871 | |
d3d4baed PA |
3872 | /* End up with readline processing input, if necessary. */ |
3873 | make_cleanup (reinstall_readline_callback_handler_cleanup, NULL); | |
3874 | ||
c5187ac6 PA |
3875 | /* We're handling a live event, so make sure we're doing live |
3876 | debugging. If we're looking at traceframes while the target is | |
3877 | running, we're going to need to get back to that mode after | |
3878 | handling the event. */ | |
3879 | if (non_stop) | |
3880 | { | |
3881 | make_cleanup_restore_current_traceframe (); | |
e6e4e701 | 3882 | set_current_traceframe (-1); |
c5187ac6 PA |
3883 | } |
3884 | ||
5ed8105e PA |
3885 | gdb::optional<scoped_restore_current_thread> maybe_restore_thread; |
3886 | ||
4f8d22e3 PA |
3887 | if (non_stop) |
3888 | /* In non-stop mode, the user/frontend should not notice a thread | |
3889 | switch due to internal events. Make sure we reverse to the | |
3890 | user selected thread and frame after handling the event and | |
3891 | running any breakpoint commands. */ | |
5ed8105e | 3892 | maybe_restore_thread.emplace (); |
4f8d22e3 | 3893 | |
ec9499be | 3894 | overlay_cache_invalid = 1; |
f15cb84a YQ |
3895 | /* Flush target cache before starting to handle each event. Target |
3896 | was running and cache could be stale. This is just a heuristic. | |
3897 | Running threads may modify target memory, but we don't get any | |
3898 | event. */ | |
3899 | target_dcache_invalidate (); | |
3dd5b83d | 3900 | |
b7b633e9 TT |
3901 | scoped_restore save_exec_dir |
3902 | = make_scoped_restore (&execution_direction, target_execution_direction ()); | |
32231432 | 3903 | |
0b333c5e PA |
3904 | ecs->ptid = do_target_wait (waiton_ptid, &ecs->ws, |
3905 | target_can_async_p () ? TARGET_WNOHANG : 0); | |
43ff13b4 | 3906 | |
f00150c9 | 3907 | if (debug_infrun) |
223698f8 | 3908 | print_target_wait_results (waiton_ptid, ecs->ptid, &ecs->ws); |
f00150c9 | 3909 | |
29f49a6a PA |
3910 | /* If an error happens while handling the event, propagate GDB's |
3911 | knowledge of the executing state to the frontend/user running | |
3912 | state. */ | |
fbea99ea | 3913 | if (!target_is_non_stop_p ()) |
29f49a6a PA |
3914 | ts_old_chain = make_cleanup (finish_thread_state_cleanup, &minus_one_ptid); |
3915 | else | |
3916 | ts_old_chain = make_cleanup (finish_thread_state_cleanup, &ecs->ptid); | |
3917 | ||
353d1d73 JK |
3918 | /* Get executed before make_cleanup_restore_current_thread above to apply |
3919 | still for the thread which has thrown the exception. */ | |
3920 | make_bpstat_clear_actions_cleanup (); | |
3921 | ||
7c16b83e PA |
3922 | make_cleanup (delete_just_stopped_threads_infrun_breakpoints_cleanup, NULL); |
3923 | ||
43ff13b4 | 3924 | /* Now figure out what to do with the result of the result. */ |
a474d7c2 | 3925 | handle_inferior_event (ecs); |
43ff13b4 | 3926 | |
a474d7c2 | 3927 | if (!ecs->wait_some_more) |
43ff13b4 | 3928 | { |
c9657e70 | 3929 | struct inferior *inf = find_inferior_ptid (ecs->ptid); |
243a9253 PA |
3930 | int should_stop = 1; |
3931 | struct thread_info *thr = ecs->event_thread; | |
388a7084 | 3932 | int should_notify_stop = 1; |
d6b48e9c | 3933 | |
0cbcdb96 | 3934 | delete_just_stopped_threads_infrun_breakpoints (); |
f107f563 | 3935 | |
243a9253 PA |
3936 | if (thr != NULL) |
3937 | { | |
3938 | struct thread_fsm *thread_fsm = thr->thread_fsm; | |
3939 | ||
3940 | if (thread_fsm != NULL) | |
8980e177 | 3941 | should_stop = thread_fsm_should_stop (thread_fsm, thr); |
243a9253 PA |
3942 | } |
3943 | ||
3944 | if (!should_stop) | |
3945 | { | |
3946 | keep_going (ecs); | |
3947 | } | |
c2d11a7d | 3948 | else |
0f641c01 | 3949 | { |
243a9253 PA |
3950 | clean_up_just_stopped_threads_fsms (ecs); |
3951 | ||
388a7084 PA |
3952 | if (thr != NULL && thr->thread_fsm != NULL) |
3953 | { | |
3954 | should_notify_stop | |
3955 | = thread_fsm_should_notify_stop (thr->thread_fsm); | |
3956 | } | |
3957 | ||
3958 | if (should_notify_stop) | |
3959 | { | |
4c2f2a79 PA |
3960 | int proceeded = 0; |
3961 | ||
388a7084 PA |
3962 | /* We may not find an inferior if this was a process exit. */ |
3963 | if (inf == NULL || inf->control.stop_soon == NO_STOP_QUIETLY) | |
4c2f2a79 | 3964 | proceeded = normal_stop (); |
243a9253 | 3965 | |
4c2f2a79 PA |
3966 | if (!proceeded) |
3967 | { | |
3968 | inferior_event_handler (INF_EXEC_COMPLETE, NULL); | |
3969 | cmd_done = 1; | |
3970 | } | |
388a7084 | 3971 | } |
0f641c01 | 3972 | } |
43ff13b4 | 3973 | } |
4f8d22e3 | 3974 | |
29f49a6a PA |
3975 | /* No error, don't finish the thread states yet. */ |
3976 | discard_cleanups (ts_old_chain); | |
3977 | ||
4f8d22e3 PA |
3978 | /* Revert thread and frame. */ |
3979 | do_cleanups (old_chain); | |
3980 | ||
3b12939d PA |
3981 | /* If a UI was in sync execution mode, and now isn't, restore its |
3982 | prompt (a synchronous execution command has finished, and we're | |
3983 | ready for input). */ | |
3984 | all_uis_check_sync_execution_done (); | |
0f641c01 PA |
3985 | |
3986 | if (cmd_done | |
0f641c01 PA |
3987 | && exec_done_display_p |
3988 | && (ptid_equal (inferior_ptid, null_ptid) | |
3989 | || !is_running (inferior_ptid))) | |
3990 | printf_unfiltered (_("completed.\n")); | |
43ff13b4 JM |
3991 | } |
3992 | ||
edb3359d DJ |
3993 | /* Record the frame and location we're currently stepping through. */ |
3994 | void | |
3995 | set_step_info (struct frame_info *frame, struct symtab_and_line sal) | |
3996 | { | |
3997 | struct thread_info *tp = inferior_thread (); | |
3998 | ||
16c381f0 JK |
3999 | tp->control.step_frame_id = get_frame_id (frame); |
4000 | tp->control.step_stack_frame_id = get_stack_frame_id (frame); | |
edb3359d DJ |
4001 | |
4002 | tp->current_symtab = sal.symtab; | |
4003 | tp->current_line = sal.line; | |
4004 | } | |
4005 | ||
0d1e5fa7 PA |
4006 | /* Clear context switchable stepping state. */ |
4007 | ||
4008 | void | |
4e1c45ea | 4009 | init_thread_stepping_state (struct thread_info *tss) |
0d1e5fa7 | 4010 | { |
7f5ef605 | 4011 | tss->stepped_breakpoint = 0; |
0d1e5fa7 | 4012 | tss->stepping_over_breakpoint = 0; |
963f9c80 | 4013 | tss->stepping_over_watchpoint = 0; |
0d1e5fa7 | 4014 | tss->step_after_step_resume_breakpoint = 0; |
cd0fc7c3 SS |
4015 | } |
4016 | ||
c32c64b7 DE |
4017 | /* Set the cached copy of the last ptid/waitstatus. */ |
4018 | ||
6efcd9a8 | 4019 | void |
c32c64b7 DE |
4020 | set_last_target_status (ptid_t ptid, struct target_waitstatus status) |
4021 | { | |
4022 | target_last_wait_ptid = ptid; | |
4023 | target_last_waitstatus = status; | |
4024 | } | |
4025 | ||
e02bc4cc | 4026 | /* Return the cached copy of the last pid/waitstatus returned by |
9a4105ab AC |
4027 | target_wait()/deprecated_target_wait_hook(). The data is actually |
4028 | cached by handle_inferior_event(), which gets called immediately | |
4029 | after target_wait()/deprecated_target_wait_hook(). */ | |
e02bc4cc DS |
4030 | |
4031 | void | |
488f131b | 4032 | get_last_target_status (ptid_t *ptidp, struct target_waitstatus *status) |
e02bc4cc | 4033 | { |
39f77062 | 4034 | *ptidp = target_last_wait_ptid; |
e02bc4cc DS |
4035 | *status = target_last_waitstatus; |
4036 | } | |
4037 | ||
ac264b3b MS |
4038 | void |
4039 | nullify_last_target_wait_ptid (void) | |
4040 | { | |
4041 | target_last_wait_ptid = minus_one_ptid; | |
4042 | } | |
4043 | ||
dcf4fbde | 4044 | /* Switch thread contexts. */ |
dd80620e MS |
4045 | |
4046 | static void | |
0d1e5fa7 | 4047 | context_switch (ptid_t ptid) |
dd80620e | 4048 | { |
4b51d87b | 4049 | if (debug_infrun && !ptid_equal (ptid, inferior_ptid)) |
fd48f117 DJ |
4050 | { |
4051 | fprintf_unfiltered (gdb_stdlog, "infrun: Switching context from %s ", | |
4052 | target_pid_to_str (inferior_ptid)); | |
4053 | fprintf_unfiltered (gdb_stdlog, "to %s\n", | |
0d1e5fa7 | 4054 | target_pid_to_str (ptid)); |
fd48f117 DJ |
4055 | } |
4056 | ||
0d1e5fa7 | 4057 | switch_to_thread (ptid); |
dd80620e MS |
4058 | } |
4059 | ||
d8dd4d5f PA |
4060 | /* If the target can't tell whether we've hit breakpoints |
4061 | (target_supports_stopped_by_sw_breakpoint), and we got a SIGTRAP, | |
4062 | check whether that could have been caused by a breakpoint. If so, | |
4063 | adjust the PC, per gdbarch_decr_pc_after_break. */ | |
4064 | ||
4fa8626c | 4065 | static void |
d8dd4d5f PA |
4066 | adjust_pc_after_break (struct thread_info *thread, |
4067 | struct target_waitstatus *ws) | |
4fa8626c | 4068 | { |
24a73cce UW |
4069 | struct regcache *regcache; |
4070 | struct gdbarch *gdbarch; | |
6c95b8df | 4071 | struct address_space *aspace; |
118e6252 | 4072 | CORE_ADDR breakpoint_pc, decr_pc; |
4fa8626c | 4073 | |
4fa8626c DJ |
4074 | /* If we've hit a breakpoint, we'll normally be stopped with SIGTRAP. If |
4075 | we aren't, just return. | |
9709f61c DJ |
4076 | |
4077 | We assume that waitkinds other than TARGET_WAITKIND_STOPPED are not | |
b798847d UW |
4078 | affected by gdbarch_decr_pc_after_break. Other waitkinds which are |
4079 | implemented by software breakpoints should be handled through the normal | |
4080 | breakpoint layer. | |
8fb3e588 | 4081 | |
4fa8626c DJ |
4082 | NOTE drow/2004-01-31: On some targets, breakpoints may generate |
4083 | different signals (SIGILL or SIGEMT for instance), but it is less | |
4084 | clear where the PC is pointing afterwards. It may not match | |
b798847d UW |
4085 | gdbarch_decr_pc_after_break. I don't know any specific target that |
4086 | generates these signals at breakpoints (the code has been in GDB since at | |
4087 | least 1992) so I can not guess how to handle them here. | |
8fb3e588 | 4088 | |
e6cf7916 UW |
4089 | In earlier versions of GDB, a target with |
4090 | gdbarch_have_nonsteppable_watchpoint would have the PC after hitting a | |
b798847d UW |
4091 | watchpoint affected by gdbarch_decr_pc_after_break. I haven't found any |
4092 | target with both of these set in GDB history, and it seems unlikely to be | |
4093 | correct, so gdbarch_have_nonsteppable_watchpoint is not checked here. */ | |
4fa8626c | 4094 | |
d8dd4d5f | 4095 | if (ws->kind != TARGET_WAITKIND_STOPPED) |
4fa8626c DJ |
4096 | return; |
4097 | ||
d8dd4d5f | 4098 | if (ws->value.sig != GDB_SIGNAL_TRAP) |
4fa8626c DJ |
4099 | return; |
4100 | ||
4058b839 PA |
4101 | /* In reverse execution, when a breakpoint is hit, the instruction |
4102 | under it has already been de-executed. The reported PC always | |
4103 | points at the breakpoint address, so adjusting it further would | |
4104 | be wrong. E.g., consider this case on a decr_pc_after_break == 1 | |
4105 | architecture: | |
4106 | ||
4107 | B1 0x08000000 : INSN1 | |
4108 | B2 0x08000001 : INSN2 | |
4109 | 0x08000002 : INSN3 | |
4110 | PC -> 0x08000003 : INSN4 | |
4111 | ||
4112 | Say you're stopped at 0x08000003 as above. Reverse continuing | |
4113 | from that point should hit B2 as below. Reading the PC when the | |
4114 | SIGTRAP is reported should read 0x08000001 and INSN2 should have | |
4115 | been de-executed already. | |
4116 | ||
4117 | B1 0x08000000 : INSN1 | |
4118 | B2 PC -> 0x08000001 : INSN2 | |
4119 | 0x08000002 : INSN3 | |
4120 | 0x08000003 : INSN4 | |
4121 | ||
4122 | We can't apply the same logic as for forward execution, because | |
4123 | we would wrongly adjust the PC to 0x08000000, since there's a | |
4124 | breakpoint at PC - 1. We'd then report a hit on B1, although | |
4125 | INSN1 hadn't been de-executed yet. Doing nothing is the correct | |
4126 | behaviour. */ | |
4127 | if (execution_direction == EXEC_REVERSE) | |
4128 | return; | |
4129 | ||
1cf4d951 PA |
4130 | /* If the target can tell whether the thread hit a SW breakpoint, |
4131 | trust it. Targets that can tell also adjust the PC | |
4132 | themselves. */ | |
4133 | if (target_supports_stopped_by_sw_breakpoint ()) | |
4134 | return; | |
4135 | ||
4136 | /* Note that relying on whether a breakpoint is planted in memory to | |
4137 | determine this can fail. E.g,. the breakpoint could have been | |
4138 | removed since. Or the thread could have been told to step an | |
4139 | instruction the size of a breakpoint instruction, and only | |
4140 | _after_ was a breakpoint inserted at its address. */ | |
4141 | ||
24a73cce UW |
4142 | /* If this target does not decrement the PC after breakpoints, then |
4143 | we have nothing to do. */ | |
d8dd4d5f | 4144 | regcache = get_thread_regcache (thread->ptid); |
24a73cce | 4145 | gdbarch = get_regcache_arch (regcache); |
118e6252 | 4146 | |
527a273a | 4147 | decr_pc = gdbarch_decr_pc_after_break (gdbarch); |
118e6252 | 4148 | if (decr_pc == 0) |
24a73cce UW |
4149 | return; |
4150 | ||
6c95b8df PA |
4151 | aspace = get_regcache_aspace (regcache); |
4152 | ||
8aad930b AC |
4153 | /* Find the location where (if we've hit a breakpoint) the |
4154 | breakpoint would be. */ | |
118e6252 | 4155 | breakpoint_pc = regcache_read_pc (regcache) - decr_pc; |
8aad930b | 4156 | |
1cf4d951 PA |
4157 | /* If the target can't tell whether a software breakpoint triggered, |
4158 | fallback to figuring it out based on breakpoints we think were | |
4159 | inserted in the target, and on whether the thread was stepped or | |
4160 | continued. */ | |
4161 | ||
1c5cfe86 PA |
4162 | /* Check whether there actually is a software breakpoint inserted at |
4163 | that location. | |
4164 | ||
4165 | If in non-stop mode, a race condition is possible where we've | |
4166 | removed a breakpoint, but stop events for that breakpoint were | |
4167 | already queued and arrive later. To suppress those spurious | |
4168 | SIGTRAPs, we keep a list of such breakpoint locations for a bit, | |
1cf4d951 PA |
4169 | and retire them after a number of stop events are reported. Note |
4170 | this is an heuristic and can thus get confused. The real fix is | |
4171 | to get the "stopped by SW BP and needs adjustment" info out of | |
4172 | the target/kernel (and thus never reach here; see above). */ | |
6c95b8df | 4173 | if (software_breakpoint_inserted_here_p (aspace, breakpoint_pc) |
fbea99ea PA |
4174 | || (target_is_non_stop_p () |
4175 | && moribund_breakpoint_here_p (aspace, breakpoint_pc))) | |
8aad930b | 4176 | { |
07036511 | 4177 | gdb::optional<scoped_restore_tmpl<int>> restore_operation_disable; |
abbb1732 | 4178 | |
8213266a | 4179 | if (record_full_is_used ()) |
07036511 TT |
4180 | restore_operation_disable.emplace |
4181 | (record_full_gdb_operation_disable_set ()); | |
96429cc8 | 4182 | |
1c0fdd0e UW |
4183 | /* When using hardware single-step, a SIGTRAP is reported for both |
4184 | a completed single-step and a software breakpoint. Need to | |
4185 | differentiate between the two, as the latter needs adjusting | |
4186 | but the former does not. | |
4187 | ||
4188 | The SIGTRAP can be due to a completed hardware single-step only if | |
4189 | - we didn't insert software single-step breakpoints | |
1c0fdd0e UW |
4190 | - this thread is currently being stepped |
4191 | ||
4192 | If any of these events did not occur, we must have stopped due | |
4193 | to hitting a software breakpoint, and have to back up to the | |
4194 | breakpoint address. | |
4195 | ||
4196 | As a special case, we could have hardware single-stepped a | |
4197 | software breakpoint. In this case (prev_pc == breakpoint_pc), | |
4198 | we also need to back up to the breakpoint address. */ | |
4199 | ||
d8dd4d5f PA |
4200 | if (thread_has_single_step_breakpoints_set (thread) |
4201 | || !currently_stepping (thread) | |
4202 | || (thread->stepped_breakpoint | |
4203 | && thread->prev_pc == breakpoint_pc)) | |
515630c5 | 4204 | regcache_write_pc (regcache, breakpoint_pc); |
8aad930b | 4205 | } |
4fa8626c DJ |
4206 | } |
4207 | ||
edb3359d DJ |
4208 | static int |
4209 | stepped_in_from (struct frame_info *frame, struct frame_id step_frame_id) | |
4210 | { | |
4211 | for (frame = get_prev_frame (frame); | |
4212 | frame != NULL; | |
4213 | frame = get_prev_frame (frame)) | |
4214 | { | |
4215 | if (frame_id_eq (get_frame_id (frame), step_frame_id)) | |
4216 | return 1; | |
4217 | if (get_frame_type (frame) != INLINE_FRAME) | |
4218 | break; | |
4219 | } | |
4220 | ||
4221 | return 0; | |
4222 | } | |
4223 | ||
c65d6b55 PA |
4224 | /* If the event thread has the stop requested flag set, pretend it |
4225 | stopped for a GDB_SIGNAL_0 (i.e., as if it stopped due to | |
4226 | target_stop). */ | |
4227 | ||
4228 | static bool | |
4229 | handle_stop_requested (struct execution_control_state *ecs) | |
4230 | { | |
4231 | if (ecs->event_thread->stop_requested) | |
4232 | { | |
4233 | ecs->ws.kind = TARGET_WAITKIND_STOPPED; | |
4234 | ecs->ws.value.sig = GDB_SIGNAL_0; | |
4235 | handle_signal_stop (ecs); | |
4236 | return true; | |
4237 | } | |
4238 | return false; | |
4239 | } | |
4240 | ||
a96d9b2e SDJ |
4241 | /* Auxiliary function that handles syscall entry/return events. |
4242 | It returns 1 if the inferior should keep going (and GDB | |
4243 | should ignore the event), or 0 if the event deserves to be | |
4244 | processed. */ | |
ca2163eb | 4245 | |
a96d9b2e | 4246 | static int |
ca2163eb | 4247 | handle_syscall_event (struct execution_control_state *ecs) |
a96d9b2e | 4248 | { |
ca2163eb | 4249 | struct regcache *regcache; |
ca2163eb PA |
4250 | int syscall_number; |
4251 | ||
4252 | if (!ptid_equal (ecs->ptid, inferior_ptid)) | |
4253 | context_switch (ecs->ptid); | |
4254 | ||
4255 | regcache = get_thread_regcache (ecs->ptid); | |
f90263c1 | 4256 | syscall_number = ecs->ws.value.syscall_number; |
ca2163eb PA |
4257 | stop_pc = regcache_read_pc (regcache); |
4258 | ||
a96d9b2e SDJ |
4259 | if (catch_syscall_enabled () > 0 |
4260 | && catching_syscall_number (syscall_number) > 0) | |
4261 | { | |
4262 | if (debug_infrun) | |
4263 | fprintf_unfiltered (gdb_stdlog, "infrun: syscall number = '%d'\n", | |
4264 | syscall_number); | |
a96d9b2e | 4265 | |
16c381f0 | 4266 | ecs->event_thread->control.stop_bpstat |
6c95b8df | 4267 | = bpstat_stop_status (get_regcache_aspace (regcache), |
09ac7c10 | 4268 | stop_pc, ecs->ptid, &ecs->ws); |
ab04a2af | 4269 | |
c65d6b55 PA |
4270 | if (handle_stop_requested (ecs)) |
4271 | return 0; | |
4272 | ||
ce12b012 | 4273 | if (bpstat_causes_stop (ecs->event_thread->control.stop_bpstat)) |
ca2163eb PA |
4274 | { |
4275 | /* Catchpoint hit. */ | |
ca2163eb PA |
4276 | return 0; |
4277 | } | |
a96d9b2e | 4278 | } |
ca2163eb | 4279 | |
c65d6b55 PA |
4280 | if (handle_stop_requested (ecs)) |
4281 | return 0; | |
4282 | ||
ca2163eb | 4283 | /* If no catchpoint triggered for this, then keep going. */ |
ca2163eb PA |
4284 | keep_going (ecs); |
4285 | return 1; | |
a96d9b2e SDJ |
4286 | } |
4287 | ||
7e324e48 GB |
4288 | /* Lazily fill in the execution_control_state's stop_func_* fields. */ |
4289 | ||
4290 | static void | |
4291 | fill_in_stop_func (struct gdbarch *gdbarch, | |
4292 | struct execution_control_state *ecs) | |
4293 | { | |
4294 | if (!ecs->stop_func_filled_in) | |
4295 | { | |
4296 | /* Don't care about return value; stop_func_start and stop_func_name | |
4297 | will both be 0 if it doesn't work. */ | |
4298 | find_pc_partial_function (stop_pc, &ecs->stop_func_name, | |
4299 | &ecs->stop_func_start, &ecs->stop_func_end); | |
4300 | ecs->stop_func_start | |
4301 | += gdbarch_deprecated_function_start_offset (gdbarch); | |
4302 | ||
591a12a1 UW |
4303 | if (gdbarch_skip_entrypoint_p (gdbarch)) |
4304 | ecs->stop_func_start = gdbarch_skip_entrypoint (gdbarch, | |
4305 | ecs->stop_func_start); | |
4306 | ||
7e324e48 GB |
4307 | ecs->stop_func_filled_in = 1; |
4308 | } | |
4309 | } | |
4310 | ||
4f5d7f63 PA |
4311 | |
4312 | /* Return the STOP_SOON field of the inferior pointed at by PTID. */ | |
4313 | ||
4314 | static enum stop_kind | |
4315 | get_inferior_stop_soon (ptid_t ptid) | |
4316 | { | |
c9657e70 | 4317 | struct inferior *inf = find_inferior_ptid (ptid); |
4f5d7f63 PA |
4318 | |
4319 | gdb_assert (inf != NULL); | |
4320 | return inf->control.stop_soon; | |
4321 | } | |
4322 | ||
372316f1 PA |
4323 | /* Wait for one event. Store the resulting waitstatus in WS, and |
4324 | return the event ptid. */ | |
4325 | ||
4326 | static ptid_t | |
4327 | wait_one (struct target_waitstatus *ws) | |
4328 | { | |
4329 | ptid_t event_ptid; | |
4330 | ptid_t wait_ptid = minus_one_ptid; | |
4331 | ||
4332 | overlay_cache_invalid = 1; | |
4333 | ||
4334 | /* Flush target cache before starting to handle each event. | |
4335 | Target was running and cache could be stale. This is just a | |
4336 | heuristic. Running threads may modify target memory, but we | |
4337 | don't get any event. */ | |
4338 | target_dcache_invalidate (); | |
4339 | ||
4340 | if (deprecated_target_wait_hook) | |
4341 | event_ptid = deprecated_target_wait_hook (wait_ptid, ws, 0); | |
4342 | else | |
4343 | event_ptid = target_wait (wait_ptid, ws, 0); | |
4344 | ||
4345 | if (debug_infrun) | |
4346 | print_target_wait_results (wait_ptid, event_ptid, ws); | |
4347 | ||
4348 | return event_ptid; | |
4349 | } | |
4350 | ||
4351 | /* Generate a wrapper for target_stopped_by_REASON that works on PTID | |
4352 | instead of the current thread. */ | |
4353 | #define THREAD_STOPPED_BY(REASON) \ | |
4354 | static int \ | |
4355 | thread_stopped_by_ ## REASON (ptid_t ptid) \ | |
4356 | { \ | |
2989a365 | 4357 | scoped_restore save_inferior_ptid = make_scoped_restore (&inferior_ptid); \ |
372316f1 PA |
4358 | inferior_ptid = ptid; \ |
4359 | \ | |
2989a365 | 4360 | return target_stopped_by_ ## REASON (); \ |
372316f1 PA |
4361 | } |
4362 | ||
4363 | /* Generate thread_stopped_by_watchpoint. */ | |
4364 | THREAD_STOPPED_BY (watchpoint) | |
4365 | /* Generate thread_stopped_by_sw_breakpoint. */ | |
4366 | THREAD_STOPPED_BY (sw_breakpoint) | |
4367 | /* Generate thread_stopped_by_hw_breakpoint. */ | |
4368 | THREAD_STOPPED_BY (hw_breakpoint) | |
4369 | ||
4370 | /* Cleanups that switches to the PTID pointed at by PTID_P. */ | |
4371 | ||
4372 | static void | |
4373 | switch_to_thread_cleanup (void *ptid_p) | |
4374 | { | |
4375 | ptid_t ptid = *(ptid_t *) ptid_p; | |
4376 | ||
4377 | switch_to_thread (ptid); | |
4378 | } | |
4379 | ||
4380 | /* Save the thread's event and stop reason to process it later. */ | |
4381 | ||
4382 | static void | |
4383 | save_waitstatus (struct thread_info *tp, struct target_waitstatus *ws) | |
4384 | { | |
4385 | struct regcache *regcache; | |
4386 | struct address_space *aspace; | |
4387 | ||
4388 | if (debug_infrun) | |
4389 | { | |
23fdd69e | 4390 | std::string statstr = target_waitstatus_to_string (ws); |
372316f1 | 4391 | |
372316f1 PA |
4392 | fprintf_unfiltered (gdb_stdlog, |
4393 | "infrun: saving status %s for %d.%ld.%ld\n", | |
23fdd69e | 4394 | statstr.c_str (), |
372316f1 PA |
4395 | ptid_get_pid (tp->ptid), |
4396 | ptid_get_lwp (tp->ptid), | |
4397 | ptid_get_tid (tp->ptid)); | |
372316f1 PA |
4398 | } |
4399 | ||
4400 | /* Record for later. */ | |
4401 | tp->suspend.waitstatus = *ws; | |
4402 | tp->suspend.waitstatus_pending_p = 1; | |
4403 | ||
4404 | regcache = get_thread_regcache (tp->ptid); | |
4405 | aspace = get_regcache_aspace (regcache); | |
4406 | ||
4407 | if (ws->kind == TARGET_WAITKIND_STOPPED | |
4408 | && ws->value.sig == GDB_SIGNAL_TRAP) | |
4409 | { | |
4410 | CORE_ADDR pc = regcache_read_pc (regcache); | |
4411 | ||
4412 | adjust_pc_after_break (tp, &tp->suspend.waitstatus); | |
4413 | ||
4414 | if (thread_stopped_by_watchpoint (tp->ptid)) | |
4415 | { | |
4416 | tp->suspend.stop_reason | |
4417 | = TARGET_STOPPED_BY_WATCHPOINT; | |
4418 | } | |
4419 | else if (target_supports_stopped_by_sw_breakpoint () | |
4420 | && thread_stopped_by_sw_breakpoint (tp->ptid)) | |
4421 | { | |
4422 | tp->suspend.stop_reason | |
4423 | = TARGET_STOPPED_BY_SW_BREAKPOINT; | |
4424 | } | |
4425 | else if (target_supports_stopped_by_hw_breakpoint () | |
4426 | && thread_stopped_by_hw_breakpoint (tp->ptid)) | |
4427 | { | |
4428 | tp->suspend.stop_reason | |
4429 | = TARGET_STOPPED_BY_HW_BREAKPOINT; | |
4430 | } | |
4431 | else if (!target_supports_stopped_by_hw_breakpoint () | |
4432 | && hardware_breakpoint_inserted_here_p (aspace, | |
4433 | pc)) | |
4434 | { | |
4435 | tp->suspend.stop_reason | |
4436 | = TARGET_STOPPED_BY_HW_BREAKPOINT; | |
4437 | } | |
4438 | else if (!target_supports_stopped_by_sw_breakpoint () | |
4439 | && software_breakpoint_inserted_here_p (aspace, | |
4440 | pc)) | |
4441 | { | |
4442 | tp->suspend.stop_reason | |
4443 | = TARGET_STOPPED_BY_SW_BREAKPOINT; | |
4444 | } | |
4445 | else if (!thread_has_single_step_breakpoints_set (tp) | |
4446 | && currently_stepping (tp)) | |
4447 | { | |
4448 | tp->suspend.stop_reason | |
4449 | = TARGET_STOPPED_BY_SINGLE_STEP; | |
4450 | } | |
4451 | } | |
4452 | } | |
4453 | ||
65706a29 PA |
4454 | /* A cleanup that disables thread create/exit events. */ |
4455 | ||
4456 | static void | |
4457 | disable_thread_events (void *arg) | |
4458 | { | |
4459 | target_thread_events (0); | |
4460 | } | |
4461 | ||
6efcd9a8 | 4462 | /* See infrun.h. */ |
372316f1 | 4463 | |
6efcd9a8 | 4464 | void |
372316f1 PA |
4465 | stop_all_threads (void) |
4466 | { | |
4467 | /* We may need multiple passes to discover all threads. */ | |
4468 | int pass; | |
4469 | int iterations = 0; | |
4470 | ptid_t entry_ptid; | |
4471 | struct cleanup *old_chain; | |
4472 | ||
fbea99ea | 4473 | gdb_assert (target_is_non_stop_p ()); |
372316f1 PA |
4474 | |
4475 | if (debug_infrun) | |
4476 | fprintf_unfiltered (gdb_stdlog, "infrun: stop_all_threads\n"); | |
4477 | ||
4478 | entry_ptid = inferior_ptid; | |
4479 | old_chain = make_cleanup (switch_to_thread_cleanup, &entry_ptid); | |
4480 | ||
65706a29 PA |
4481 | target_thread_events (1); |
4482 | make_cleanup (disable_thread_events, NULL); | |
4483 | ||
372316f1 PA |
4484 | /* Request threads to stop, and then wait for the stops. Because |
4485 | threads we already know about can spawn more threads while we're | |
4486 | trying to stop them, and we only learn about new threads when we | |
4487 | update the thread list, do this in a loop, and keep iterating | |
4488 | until two passes find no threads that need to be stopped. */ | |
4489 | for (pass = 0; pass < 2; pass++, iterations++) | |
4490 | { | |
4491 | if (debug_infrun) | |
4492 | fprintf_unfiltered (gdb_stdlog, | |
4493 | "infrun: stop_all_threads, pass=%d, " | |
4494 | "iterations=%d\n", pass, iterations); | |
4495 | while (1) | |
4496 | { | |
4497 | ptid_t event_ptid; | |
4498 | struct target_waitstatus ws; | |
4499 | int need_wait = 0; | |
4500 | struct thread_info *t; | |
4501 | ||
4502 | update_thread_list (); | |
4503 | ||
4504 | /* Go through all threads looking for threads that we need | |
4505 | to tell the target to stop. */ | |
4506 | ALL_NON_EXITED_THREADS (t) | |
4507 | { | |
4508 | if (t->executing) | |
4509 | { | |
4510 | /* If already stopping, don't request a stop again. | |
4511 | We just haven't seen the notification yet. */ | |
4512 | if (!t->stop_requested) | |
4513 | { | |
4514 | if (debug_infrun) | |
4515 | fprintf_unfiltered (gdb_stdlog, | |
4516 | "infrun: %s executing, " | |
4517 | "need stop\n", | |
4518 | target_pid_to_str (t->ptid)); | |
4519 | target_stop (t->ptid); | |
4520 | t->stop_requested = 1; | |
4521 | } | |
4522 | else | |
4523 | { | |
4524 | if (debug_infrun) | |
4525 | fprintf_unfiltered (gdb_stdlog, | |
4526 | "infrun: %s executing, " | |
4527 | "already stopping\n", | |
4528 | target_pid_to_str (t->ptid)); | |
4529 | } | |
4530 | ||
4531 | if (t->stop_requested) | |
4532 | need_wait = 1; | |
4533 | } | |
4534 | else | |
4535 | { | |
4536 | if (debug_infrun) | |
4537 | fprintf_unfiltered (gdb_stdlog, | |
4538 | "infrun: %s not executing\n", | |
4539 | target_pid_to_str (t->ptid)); | |
4540 | ||
4541 | /* The thread may be not executing, but still be | |
4542 | resumed with a pending status to process. */ | |
4543 | t->resumed = 0; | |
4544 | } | |
4545 | } | |
4546 | ||
4547 | if (!need_wait) | |
4548 | break; | |
4549 | ||
4550 | /* If we find new threads on the second iteration, restart | |
4551 | over. We want to see two iterations in a row with all | |
4552 | threads stopped. */ | |
4553 | if (pass > 0) | |
4554 | pass = -1; | |
4555 | ||
4556 | event_ptid = wait_one (&ws); | |
4557 | if (ws.kind == TARGET_WAITKIND_NO_RESUMED) | |
4558 | { | |
4559 | /* All resumed threads exited. */ | |
4560 | } | |
65706a29 PA |
4561 | else if (ws.kind == TARGET_WAITKIND_THREAD_EXITED |
4562 | || ws.kind == TARGET_WAITKIND_EXITED | |
372316f1 PA |
4563 | || ws.kind == TARGET_WAITKIND_SIGNALLED) |
4564 | { | |
4565 | if (debug_infrun) | |
4566 | { | |
4567 | ptid_t ptid = pid_to_ptid (ws.value.integer); | |
4568 | ||
4569 | fprintf_unfiltered (gdb_stdlog, | |
4570 | "infrun: %s exited while " | |
4571 | "stopping threads\n", | |
4572 | target_pid_to_str (ptid)); | |
4573 | } | |
4574 | } | |
4575 | else | |
4576 | { | |
6efcd9a8 PA |
4577 | struct inferior *inf; |
4578 | ||
372316f1 PA |
4579 | t = find_thread_ptid (event_ptid); |
4580 | if (t == NULL) | |
4581 | t = add_thread (event_ptid); | |
4582 | ||
4583 | t->stop_requested = 0; | |
4584 | t->executing = 0; | |
4585 | t->resumed = 0; | |
4586 | t->control.may_range_step = 0; | |
4587 | ||
6efcd9a8 PA |
4588 | /* This may be the first time we see the inferior report |
4589 | a stop. */ | |
4590 | inf = find_inferior_ptid (event_ptid); | |
4591 | if (inf->needs_setup) | |
4592 | { | |
4593 | switch_to_thread_no_regs (t); | |
4594 | setup_inferior (0); | |
4595 | } | |
4596 | ||
372316f1 PA |
4597 | if (ws.kind == TARGET_WAITKIND_STOPPED |
4598 | && ws.value.sig == GDB_SIGNAL_0) | |
4599 | { | |
4600 | /* We caught the event that we intended to catch, so | |
4601 | there's no event pending. */ | |
4602 | t->suspend.waitstatus.kind = TARGET_WAITKIND_IGNORE; | |
4603 | t->suspend.waitstatus_pending_p = 0; | |
4604 | ||
4605 | if (displaced_step_fixup (t->ptid, GDB_SIGNAL_0) < 0) | |
4606 | { | |
4607 | /* Add it back to the step-over queue. */ | |
4608 | if (debug_infrun) | |
4609 | { | |
4610 | fprintf_unfiltered (gdb_stdlog, | |
4611 | "infrun: displaced-step of %s " | |
4612 | "canceled: adding back to the " | |
4613 | "step-over queue\n", | |
4614 | target_pid_to_str (t->ptid)); | |
4615 | } | |
4616 | t->control.trap_expected = 0; | |
4617 | thread_step_over_chain_enqueue (t); | |
4618 | } | |
4619 | } | |
4620 | else | |
4621 | { | |
4622 | enum gdb_signal sig; | |
4623 | struct regcache *regcache; | |
372316f1 PA |
4624 | |
4625 | if (debug_infrun) | |
4626 | { | |
23fdd69e | 4627 | std::string statstr = target_waitstatus_to_string (&ws); |
372316f1 | 4628 | |
372316f1 PA |
4629 | fprintf_unfiltered (gdb_stdlog, |
4630 | "infrun: target_wait %s, saving " | |
4631 | "status for %d.%ld.%ld\n", | |
23fdd69e | 4632 | statstr.c_str (), |
372316f1 PA |
4633 | ptid_get_pid (t->ptid), |
4634 | ptid_get_lwp (t->ptid), | |
4635 | ptid_get_tid (t->ptid)); | |
372316f1 PA |
4636 | } |
4637 | ||
4638 | /* Record for later. */ | |
4639 | save_waitstatus (t, &ws); | |
4640 | ||
4641 | sig = (ws.kind == TARGET_WAITKIND_STOPPED | |
4642 | ? ws.value.sig : GDB_SIGNAL_0); | |
4643 | ||
4644 | if (displaced_step_fixup (t->ptid, sig) < 0) | |
4645 | { | |
4646 | /* Add it back to the step-over queue. */ | |
4647 | t->control.trap_expected = 0; | |
4648 | thread_step_over_chain_enqueue (t); | |
4649 | } | |
4650 | ||
4651 | regcache = get_thread_regcache (t->ptid); | |
4652 | t->suspend.stop_pc = regcache_read_pc (regcache); | |
4653 | ||
4654 | if (debug_infrun) | |
4655 | { | |
4656 | fprintf_unfiltered (gdb_stdlog, | |
4657 | "infrun: saved stop_pc=%s for %s " | |
4658 | "(currently_stepping=%d)\n", | |
4659 | paddress (target_gdbarch (), | |
4660 | t->suspend.stop_pc), | |
4661 | target_pid_to_str (t->ptid), | |
4662 | currently_stepping (t)); | |
4663 | } | |
4664 | } | |
4665 | } | |
4666 | } | |
4667 | } | |
4668 | ||
4669 | do_cleanups (old_chain); | |
4670 | ||
4671 | if (debug_infrun) | |
4672 | fprintf_unfiltered (gdb_stdlog, "infrun: stop_all_threads done\n"); | |
4673 | } | |
4674 | ||
f4836ba9 PA |
4675 | /* Handle a TARGET_WAITKIND_NO_RESUMED event. */ |
4676 | ||
4677 | static int | |
4678 | handle_no_resumed (struct execution_control_state *ecs) | |
4679 | { | |
4680 | struct inferior *inf; | |
4681 | struct thread_info *thread; | |
4682 | ||
3b12939d | 4683 | if (target_can_async_p ()) |
f4836ba9 | 4684 | { |
3b12939d PA |
4685 | struct ui *ui; |
4686 | int any_sync = 0; | |
f4836ba9 | 4687 | |
3b12939d PA |
4688 | ALL_UIS (ui) |
4689 | { | |
4690 | if (ui->prompt_state == PROMPT_BLOCKED) | |
4691 | { | |
4692 | any_sync = 1; | |
4693 | break; | |
4694 | } | |
4695 | } | |
4696 | if (!any_sync) | |
4697 | { | |
4698 | /* There were no unwaited-for children left in the target, but, | |
4699 | we're not synchronously waiting for events either. Just | |
4700 | ignore. */ | |
4701 | ||
4702 | if (debug_infrun) | |
4703 | fprintf_unfiltered (gdb_stdlog, | |
4704 | "infrun: TARGET_WAITKIND_NO_RESUMED " | |
4705 | "(ignoring: bg)\n"); | |
4706 | prepare_to_wait (ecs); | |
4707 | return 1; | |
4708 | } | |
f4836ba9 PA |
4709 | } |
4710 | ||
4711 | /* Otherwise, if we were running a synchronous execution command, we | |
4712 | may need to cancel it and give the user back the terminal. | |
4713 | ||
4714 | In non-stop mode, the target can't tell whether we've already | |
4715 | consumed previous stop events, so it can end up sending us a | |
4716 | no-resumed event like so: | |
4717 | ||
4718 | #0 - thread 1 is left stopped | |
4719 | ||
4720 | #1 - thread 2 is resumed and hits breakpoint | |
4721 | -> TARGET_WAITKIND_STOPPED | |
4722 | ||
4723 | #2 - thread 3 is resumed and exits | |
4724 | this is the last resumed thread, so | |
4725 | -> TARGET_WAITKIND_NO_RESUMED | |
4726 | ||
4727 | #3 - gdb processes stop for thread 2 and decides to re-resume | |
4728 | it. | |
4729 | ||
4730 | #4 - gdb processes the TARGET_WAITKIND_NO_RESUMED event. | |
4731 | thread 2 is now resumed, so the event should be ignored. | |
4732 | ||
4733 | IOW, if the stop for thread 2 doesn't end a foreground command, | |
4734 | then we need to ignore the following TARGET_WAITKIND_NO_RESUMED | |
4735 | event. But it could be that the event meant that thread 2 itself | |
4736 | (or whatever other thread was the last resumed thread) exited. | |
4737 | ||
4738 | To address this we refresh the thread list and check whether we | |
4739 | have resumed threads _now_. In the example above, this removes | |
4740 | thread 3 from the thread list. If thread 2 was re-resumed, we | |
4741 | ignore this event. If we find no thread resumed, then we cancel | |
4742 | the synchronous command show "no unwaited-for " to the user. */ | |
4743 | update_thread_list (); | |
4744 | ||
4745 | ALL_NON_EXITED_THREADS (thread) | |
4746 | { | |
4747 | if (thread->executing | |
4748 | || thread->suspend.waitstatus_pending_p) | |
4749 | { | |
4750 | /* There were no unwaited-for children left in the target at | |
4751 | some point, but there are now. Just ignore. */ | |
4752 | if (debug_infrun) | |
4753 | fprintf_unfiltered (gdb_stdlog, | |
4754 | "infrun: TARGET_WAITKIND_NO_RESUMED " | |
4755 | "(ignoring: found resumed)\n"); | |
4756 | prepare_to_wait (ecs); | |
4757 | return 1; | |
4758 | } | |
4759 | } | |
4760 | ||
4761 | /* Note however that we may find no resumed thread because the whole | |
4762 | process exited meanwhile (thus updating the thread list results | |
4763 | in an empty thread list). In this case we know we'll be getting | |
4764 | a process exit event shortly. */ | |
4765 | ALL_INFERIORS (inf) | |
4766 | { | |
4767 | if (inf->pid == 0) | |
4768 | continue; | |
4769 | ||
4770 | thread = any_live_thread_of_process (inf->pid); | |
4771 | if (thread == NULL) | |
4772 | { | |
4773 | if (debug_infrun) | |
4774 | fprintf_unfiltered (gdb_stdlog, | |
4775 | "infrun: TARGET_WAITKIND_NO_RESUMED " | |
4776 | "(expect process exit)\n"); | |
4777 | prepare_to_wait (ecs); | |
4778 | return 1; | |
4779 | } | |
4780 | } | |
4781 | ||
4782 | /* Go ahead and report the event. */ | |
4783 | return 0; | |
4784 | } | |
4785 | ||
05ba8510 PA |
4786 | /* Given an execution control state that has been freshly filled in by |
4787 | an event from the inferior, figure out what it means and take | |
4788 | appropriate action. | |
4789 | ||
4790 | The alternatives are: | |
4791 | ||
22bcd14b | 4792 | 1) stop_waiting and return; to really stop and return to the |
05ba8510 PA |
4793 | debugger. |
4794 | ||
4795 | 2) keep_going and return; to wait for the next event (set | |
4796 | ecs->event_thread->stepping_over_breakpoint to 1 to single step | |
4797 | once). */ | |
c906108c | 4798 | |
ec9499be | 4799 | static void |
0b6e5e10 | 4800 | handle_inferior_event_1 (struct execution_control_state *ecs) |
cd0fc7c3 | 4801 | { |
d6b48e9c PA |
4802 | enum stop_kind stop_soon; |
4803 | ||
28736962 PA |
4804 | if (ecs->ws.kind == TARGET_WAITKIND_IGNORE) |
4805 | { | |
4806 | /* We had an event in the inferior, but we are not interested in | |
4807 | handling it at this level. The lower layers have already | |
4808 | done what needs to be done, if anything. | |
4809 | ||
4810 | One of the possible circumstances for this is when the | |
4811 | inferior produces output for the console. The inferior has | |
4812 | not stopped, and we are ignoring the event. Another possible | |
4813 | circumstance is any event which the lower level knows will be | |
4814 | reported multiple times without an intervening resume. */ | |
4815 | if (debug_infrun) | |
4816 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_IGNORE\n"); | |
4817 | prepare_to_wait (ecs); | |
4818 | return; | |
4819 | } | |
4820 | ||
65706a29 PA |
4821 | if (ecs->ws.kind == TARGET_WAITKIND_THREAD_EXITED) |
4822 | { | |
4823 | if (debug_infrun) | |
4824 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_THREAD_EXITED\n"); | |
4825 | prepare_to_wait (ecs); | |
4826 | return; | |
4827 | } | |
4828 | ||
0e5bf2a8 | 4829 | if (ecs->ws.kind == TARGET_WAITKIND_NO_RESUMED |
f4836ba9 PA |
4830 | && handle_no_resumed (ecs)) |
4831 | return; | |
0e5bf2a8 | 4832 | |
1777feb0 | 4833 | /* Cache the last pid/waitstatus. */ |
c32c64b7 | 4834 | set_last_target_status (ecs->ptid, ecs->ws); |
e02bc4cc | 4835 | |
ca005067 | 4836 | /* Always clear state belonging to the previous time we stopped. */ |
aa7d318d | 4837 | stop_stack_dummy = STOP_NONE; |
ca005067 | 4838 | |
0e5bf2a8 PA |
4839 | if (ecs->ws.kind == TARGET_WAITKIND_NO_RESUMED) |
4840 | { | |
4841 | /* No unwaited-for children left. IOW, all resumed children | |
4842 | have exited. */ | |
4843 | if (debug_infrun) | |
4844 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_NO_RESUMED\n"); | |
4845 | ||
4846 | stop_print_frame = 0; | |
22bcd14b | 4847 | stop_waiting (ecs); |
0e5bf2a8 PA |
4848 | return; |
4849 | } | |
4850 | ||
8c90c137 | 4851 | if (ecs->ws.kind != TARGET_WAITKIND_EXITED |
64776a0b | 4852 | && ecs->ws.kind != TARGET_WAITKIND_SIGNALLED) |
359f5fe6 PA |
4853 | { |
4854 | ecs->event_thread = find_thread_ptid (ecs->ptid); | |
4855 | /* If it's a new thread, add it to the thread database. */ | |
4856 | if (ecs->event_thread == NULL) | |
4857 | ecs->event_thread = add_thread (ecs->ptid); | |
c1e36e3e PA |
4858 | |
4859 | /* Disable range stepping. If the next step request could use a | |
4860 | range, this will be end up re-enabled then. */ | |
4861 | ecs->event_thread->control.may_range_step = 0; | |
359f5fe6 | 4862 | } |
88ed393a JK |
4863 | |
4864 | /* Dependent on valid ECS->EVENT_THREAD. */ | |
d8dd4d5f | 4865 | adjust_pc_after_break (ecs->event_thread, &ecs->ws); |
88ed393a JK |
4866 | |
4867 | /* Dependent on the current PC value modified by adjust_pc_after_break. */ | |
4868 | reinit_frame_cache (); | |
4869 | ||
28736962 PA |
4870 | breakpoint_retire_moribund (); |
4871 | ||
2b009048 DJ |
4872 | /* First, distinguish signals caused by the debugger from signals |
4873 | that have to do with the program's own actions. Note that | |
4874 | breakpoint insns may cause SIGTRAP or SIGILL or SIGEMT, depending | |
4875 | on the operating system version. Here we detect when a SIGILL or | |
4876 | SIGEMT is really a breakpoint and change it to SIGTRAP. We do | |
4877 | something similar for SIGSEGV, since a SIGSEGV will be generated | |
4878 | when we're trying to execute a breakpoint instruction on a | |
4879 | non-executable stack. This happens for call dummy breakpoints | |
4880 | for architectures like SPARC that place call dummies on the | |
4881 | stack. */ | |
2b009048 | 4882 | if (ecs->ws.kind == TARGET_WAITKIND_STOPPED |
a493e3e2 PA |
4883 | && (ecs->ws.value.sig == GDB_SIGNAL_ILL |
4884 | || ecs->ws.value.sig == GDB_SIGNAL_SEGV | |
4885 | || ecs->ws.value.sig == GDB_SIGNAL_EMT)) | |
2b009048 | 4886 | { |
de0a0249 UW |
4887 | struct regcache *regcache = get_thread_regcache (ecs->ptid); |
4888 | ||
4889 | if (breakpoint_inserted_here_p (get_regcache_aspace (regcache), | |
4890 | regcache_read_pc (regcache))) | |
4891 | { | |
4892 | if (debug_infrun) | |
4893 | fprintf_unfiltered (gdb_stdlog, | |
4894 | "infrun: Treating signal as SIGTRAP\n"); | |
a493e3e2 | 4895 | ecs->ws.value.sig = GDB_SIGNAL_TRAP; |
de0a0249 | 4896 | } |
2b009048 DJ |
4897 | } |
4898 | ||
28736962 PA |
4899 | /* Mark the non-executing threads accordingly. In all-stop, all |
4900 | threads of all processes are stopped when we get any event | |
e1316e60 | 4901 | reported. In non-stop mode, only the event thread stops. */ |
372316f1 PA |
4902 | { |
4903 | ptid_t mark_ptid; | |
4904 | ||
fbea99ea | 4905 | if (!target_is_non_stop_p ()) |
372316f1 PA |
4906 | mark_ptid = minus_one_ptid; |
4907 | else if (ecs->ws.kind == TARGET_WAITKIND_SIGNALLED | |
4908 | || ecs->ws.kind == TARGET_WAITKIND_EXITED) | |
4909 | { | |
4910 | /* If we're handling a process exit in non-stop mode, even | |
4911 | though threads haven't been deleted yet, one would think | |
4912 | that there is nothing to do, as threads of the dead process | |
4913 | will be soon deleted, and threads of any other process were | |
4914 | left running. However, on some targets, threads survive a | |
4915 | process exit event. E.g., for the "checkpoint" command, | |
4916 | when the current checkpoint/fork exits, linux-fork.c | |
4917 | automatically switches to another fork from within | |
4918 | target_mourn_inferior, by associating the same | |
4919 | inferior/thread to another fork. We haven't mourned yet at | |
4920 | this point, but we must mark any threads left in the | |
4921 | process as not-executing so that finish_thread_state marks | |
4922 | them stopped (in the user's perspective) if/when we present | |
4923 | the stop to the user. */ | |
4924 | mark_ptid = pid_to_ptid (ptid_get_pid (ecs->ptid)); | |
4925 | } | |
4926 | else | |
4927 | mark_ptid = ecs->ptid; | |
4928 | ||
4929 | set_executing (mark_ptid, 0); | |
4930 | ||
4931 | /* Likewise the resumed flag. */ | |
4932 | set_resumed (mark_ptid, 0); | |
4933 | } | |
8c90c137 | 4934 | |
488f131b JB |
4935 | switch (ecs->ws.kind) |
4936 | { | |
4937 | case TARGET_WAITKIND_LOADED: | |
527159b7 | 4938 | if (debug_infrun) |
8a9de0e4 | 4939 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_LOADED\n"); |
5c09a2c5 PA |
4940 | if (!ptid_equal (ecs->ptid, inferior_ptid)) |
4941 | context_switch (ecs->ptid); | |
b0f4b84b DJ |
4942 | /* Ignore gracefully during startup of the inferior, as it might |
4943 | be the shell which has just loaded some objects, otherwise | |
4944 | add the symbols for the newly loaded objects. Also ignore at | |
4945 | the beginning of an attach or remote session; we will query | |
4946 | the full list of libraries once the connection is | |
4947 | established. */ | |
4f5d7f63 PA |
4948 | |
4949 | stop_soon = get_inferior_stop_soon (ecs->ptid); | |
c0236d92 | 4950 | if (stop_soon == NO_STOP_QUIETLY) |
488f131b | 4951 | { |
edcc5120 TT |
4952 | struct regcache *regcache; |
4953 | ||
edcc5120 TT |
4954 | regcache = get_thread_regcache (ecs->ptid); |
4955 | ||
4956 | handle_solib_event (); | |
4957 | ||
4958 | ecs->event_thread->control.stop_bpstat | |
4959 | = bpstat_stop_status (get_regcache_aspace (regcache), | |
4960 | stop_pc, ecs->ptid, &ecs->ws); | |
ab04a2af | 4961 | |
c65d6b55 PA |
4962 | if (handle_stop_requested (ecs)) |
4963 | return; | |
4964 | ||
ce12b012 | 4965 | if (bpstat_causes_stop (ecs->event_thread->control.stop_bpstat)) |
edcc5120 TT |
4966 | { |
4967 | /* A catchpoint triggered. */ | |
94c57d6a PA |
4968 | process_event_stop_test (ecs); |
4969 | return; | |
edcc5120 | 4970 | } |
488f131b | 4971 | |
b0f4b84b DJ |
4972 | /* If requested, stop when the dynamic linker notifies |
4973 | gdb of events. This allows the user to get control | |
4974 | and place breakpoints in initializer routines for | |
4975 | dynamically loaded objects (among other things). */ | |
a493e3e2 | 4976 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; |
b0f4b84b DJ |
4977 | if (stop_on_solib_events) |
4978 | { | |
55409f9d DJ |
4979 | /* Make sure we print "Stopped due to solib-event" in |
4980 | normal_stop. */ | |
4981 | stop_print_frame = 1; | |
4982 | ||
22bcd14b | 4983 | stop_waiting (ecs); |
b0f4b84b DJ |
4984 | return; |
4985 | } | |
488f131b | 4986 | } |
b0f4b84b DJ |
4987 | |
4988 | /* If we are skipping through a shell, or through shared library | |
4989 | loading that we aren't interested in, resume the program. If | |
5c09a2c5 | 4990 | we're running the program normally, also resume. */ |
b0f4b84b DJ |
4991 | if (stop_soon == STOP_QUIETLY || stop_soon == NO_STOP_QUIETLY) |
4992 | { | |
74960c60 VP |
4993 | /* Loading of shared libraries might have changed breakpoint |
4994 | addresses. Make sure new breakpoints are inserted. */ | |
a25a5a45 | 4995 | if (stop_soon == NO_STOP_QUIETLY) |
74960c60 | 4996 | insert_breakpoints (); |
64ce06e4 | 4997 | resume (GDB_SIGNAL_0); |
b0f4b84b DJ |
4998 | prepare_to_wait (ecs); |
4999 | return; | |
5000 | } | |
5001 | ||
5c09a2c5 PA |
5002 | /* But stop if we're attaching or setting up a remote |
5003 | connection. */ | |
5004 | if (stop_soon == STOP_QUIETLY_NO_SIGSTOP | |
5005 | || stop_soon == STOP_QUIETLY_REMOTE) | |
5006 | { | |
5007 | if (debug_infrun) | |
5008 | fprintf_unfiltered (gdb_stdlog, "infrun: quietly stopped\n"); | |
22bcd14b | 5009 | stop_waiting (ecs); |
5c09a2c5 PA |
5010 | return; |
5011 | } | |
5012 | ||
5013 | internal_error (__FILE__, __LINE__, | |
5014 | _("unhandled stop_soon: %d"), (int) stop_soon); | |
c5aa993b | 5015 | |
488f131b | 5016 | case TARGET_WAITKIND_SPURIOUS: |
527159b7 | 5017 | if (debug_infrun) |
8a9de0e4 | 5018 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_SPURIOUS\n"); |
c65d6b55 PA |
5019 | if (handle_stop_requested (ecs)) |
5020 | return; | |
64776a0b | 5021 | if (!ptid_equal (ecs->ptid, inferior_ptid)) |
8b3ee56d | 5022 | context_switch (ecs->ptid); |
64ce06e4 | 5023 | resume (GDB_SIGNAL_0); |
488f131b JB |
5024 | prepare_to_wait (ecs); |
5025 | return; | |
c5aa993b | 5026 | |
65706a29 PA |
5027 | case TARGET_WAITKIND_THREAD_CREATED: |
5028 | if (debug_infrun) | |
5029 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_THREAD_CREATED\n"); | |
c65d6b55 PA |
5030 | if (handle_stop_requested (ecs)) |
5031 | return; | |
65706a29 PA |
5032 | if (!ptid_equal (ecs->ptid, inferior_ptid)) |
5033 | context_switch (ecs->ptid); | |
5034 | if (!switch_back_to_stepped_thread (ecs)) | |
5035 | keep_going (ecs); | |
5036 | return; | |
5037 | ||
488f131b | 5038 | case TARGET_WAITKIND_EXITED: |
940c3c06 | 5039 | case TARGET_WAITKIND_SIGNALLED: |
527159b7 | 5040 | if (debug_infrun) |
940c3c06 PA |
5041 | { |
5042 | if (ecs->ws.kind == TARGET_WAITKIND_EXITED) | |
5043 | fprintf_unfiltered (gdb_stdlog, | |
5044 | "infrun: TARGET_WAITKIND_EXITED\n"); | |
5045 | else | |
5046 | fprintf_unfiltered (gdb_stdlog, | |
5047 | "infrun: TARGET_WAITKIND_SIGNALLED\n"); | |
5048 | } | |
5049 | ||
fb66883a | 5050 | inferior_ptid = ecs->ptid; |
c9657e70 | 5051 | set_current_inferior (find_inferior_ptid (ecs->ptid)); |
6c95b8df PA |
5052 | set_current_program_space (current_inferior ()->pspace); |
5053 | handle_vfork_child_exec_or_exit (0); | |
223ffa71 | 5054 | target_terminal::ours (); /* Must do this before mourn anyway. */ |
488f131b | 5055 | |
0c557179 SDJ |
5056 | /* Clearing any previous state of convenience variables. */ |
5057 | clear_exit_convenience_vars (); | |
5058 | ||
940c3c06 PA |
5059 | if (ecs->ws.kind == TARGET_WAITKIND_EXITED) |
5060 | { | |
5061 | /* Record the exit code in the convenience variable $_exitcode, so | |
5062 | that the user can inspect this again later. */ | |
5063 | set_internalvar_integer (lookup_internalvar ("_exitcode"), | |
5064 | (LONGEST) ecs->ws.value.integer); | |
5065 | ||
5066 | /* Also record this in the inferior itself. */ | |
5067 | current_inferior ()->has_exit_code = 1; | |
5068 | current_inferior ()->exit_code = (LONGEST) ecs->ws.value.integer; | |
8cf64490 | 5069 | |
98eb56a4 PA |
5070 | /* Support the --return-child-result option. */ |
5071 | return_child_result_value = ecs->ws.value.integer; | |
5072 | ||
fd664c91 | 5073 | observer_notify_exited (ecs->ws.value.integer); |
940c3c06 PA |
5074 | } |
5075 | else | |
0c557179 SDJ |
5076 | { |
5077 | struct regcache *regcache = get_thread_regcache (ecs->ptid); | |
5078 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
5079 | ||
5080 | if (gdbarch_gdb_signal_to_target_p (gdbarch)) | |
5081 | { | |
5082 | /* Set the value of the internal variable $_exitsignal, | |
5083 | which holds the signal uncaught by the inferior. */ | |
5084 | set_internalvar_integer (lookup_internalvar ("_exitsignal"), | |
5085 | gdbarch_gdb_signal_to_target (gdbarch, | |
5086 | ecs->ws.value.sig)); | |
5087 | } | |
5088 | else | |
5089 | { | |
5090 | /* We don't have access to the target's method used for | |
5091 | converting between signal numbers (GDB's internal | |
5092 | representation <-> target's representation). | |
5093 | Therefore, we cannot do a good job at displaying this | |
5094 | information to the user. It's better to just warn | |
5095 | her about it (if infrun debugging is enabled), and | |
5096 | give up. */ | |
5097 | if (debug_infrun) | |
5098 | fprintf_filtered (gdb_stdlog, _("\ | |
5099 | Cannot fill $_exitsignal with the correct signal number.\n")); | |
5100 | } | |
5101 | ||
fd664c91 | 5102 | observer_notify_signal_exited (ecs->ws.value.sig); |
0c557179 | 5103 | } |
8cf64490 | 5104 | |
488f131b | 5105 | gdb_flush (gdb_stdout); |
bc1e6c81 | 5106 | target_mourn_inferior (inferior_ptid); |
488f131b | 5107 | stop_print_frame = 0; |
22bcd14b | 5108 | stop_waiting (ecs); |
488f131b | 5109 | return; |
c5aa993b | 5110 | |
488f131b | 5111 | /* The following are the only cases in which we keep going; |
1777feb0 | 5112 | the above cases end in a continue or goto. */ |
488f131b | 5113 | case TARGET_WAITKIND_FORKED: |
deb3b17b | 5114 | case TARGET_WAITKIND_VFORKED: |
527159b7 | 5115 | if (debug_infrun) |
fed708ed PA |
5116 | { |
5117 | if (ecs->ws.kind == TARGET_WAITKIND_FORKED) | |
5118 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_FORKED\n"); | |
5119 | else | |
5120 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_VFORKED\n"); | |
5121 | } | |
c906108c | 5122 | |
e2d96639 YQ |
5123 | /* Check whether the inferior is displaced stepping. */ |
5124 | { | |
5125 | struct regcache *regcache = get_thread_regcache (ecs->ptid); | |
5126 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
e2d96639 YQ |
5127 | |
5128 | /* If checking displaced stepping is supported, and thread | |
5129 | ecs->ptid is displaced stepping. */ | |
c0987663 | 5130 | if (displaced_step_in_progress_thread (ecs->ptid)) |
e2d96639 YQ |
5131 | { |
5132 | struct inferior *parent_inf | |
c9657e70 | 5133 | = find_inferior_ptid (ecs->ptid); |
e2d96639 YQ |
5134 | struct regcache *child_regcache; |
5135 | CORE_ADDR parent_pc; | |
5136 | ||
5137 | /* GDB has got TARGET_WAITKIND_FORKED or TARGET_WAITKIND_VFORKED, | |
5138 | indicating that the displaced stepping of syscall instruction | |
5139 | has been done. Perform cleanup for parent process here. Note | |
5140 | that this operation also cleans up the child process for vfork, | |
5141 | because their pages are shared. */ | |
a493e3e2 | 5142 | displaced_step_fixup (ecs->ptid, GDB_SIGNAL_TRAP); |
c2829269 PA |
5143 | /* Start a new step-over in another thread if there's one |
5144 | that needs it. */ | |
5145 | start_step_over (); | |
e2d96639 YQ |
5146 | |
5147 | if (ecs->ws.kind == TARGET_WAITKIND_FORKED) | |
5148 | { | |
c0987663 YQ |
5149 | struct displaced_step_inferior_state *displaced |
5150 | = get_displaced_stepping_state (ptid_get_pid (ecs->ptid)); | |
5151 | ||
e2d96639 YQ |
5152 | /* Restore scratch pad for child process. */ |
5153 | displaced_step_restore (displaced, ecs->ws.value.related_pid); | |
5154 | } | |
5155 | ||
5156 | /* Since the vfork/fork syscall instruction was executed in the scratchpad, | |
5157 | the child's PC is also within the scratchpad. Set the child's PC | |
5158 | to the parent's PC value, which has already been fixed up. | |
5159 | FIXME: we use the parent's aspace here, although we're touching | |
5160 | the child, because the child hasn't been added to the inferior | |
5161 | list yet at this point. */ | |
5162 | ||
5163 | child_regcache | |
5164 | = get_thread_arch_aspace_regcache (ecs->ws.value.related_pid, | |
5165 | gdbarch, | |
5166 | parent_inf->aspace); | |
5167 | /* Read PC value of parent process. */ | |
5168 | parent_pc = regcache_read_pc (regcache); | |
5169 | ||
5170 | if (debug_displaced) | |
5171 | fprintf_unfiltered (gdb_stdlog, | |
5172 | "displaced: write child pc from %s to %s\n", | |
5173 | paddress (gdbarch, | |
5174 | regcache_read_pc (child_regcache)), | |
5175 | paddress (gdbarch, parent_pc)); | |
5176 | ||
5177 | regcache_write_pc (child_regcache, parent_pc); | |
5178 | } | |
5179 | } | |
5180 | ||
5a2901d9 | 5181 | if (!ptid_equal (ecs->ptid, inferior_ptid)) |
c3a01a22 | 5182 | context_switch (ecs->ptid); |
5a2901d9 | 5183 | |
b242c3c2 PA |
5184 | /* Immediately detach breakpoints from the child before there's |
5185 | any chance of letting the user delete breakpoints from the | |
5186 | breakpoint lists. If we don't do this early, it's easy to | |
5187 | leave left over traps in the child, vis: "break foo; catch | |
5188 | fork; c; <fork>; del; c; <child calls foo>". We only follow | |
5189 | the fork on the last `continue', and by that time the | |
5190 | breakpoint at "foo" is long gone from the breakpoint table. | |
5191 | If we vforked, then we don't need to unpatch here, since both | |
5192 | parent and child are sharing the same memory pages; we'll | |
5193 | need to unpatch at follow/detach time instead to be certain | |
5194 | that new breakpoints added between catchpoint hit time and | |
5195 | vfork follow are detached. */ | |
5196 | if (ecs->ws.kind != TARGET_WAITKIND_VFORKED) | |
5197 | { | |
b242c3c2 PA |
5198 | /* This won't actually modify the breakpoint list, but will |
5199 | physically remove the breakpoints from the child. */ | |
d80ee84f | 5200 | detach_breakpoints (ecs->ws.value.related_pid); |
b242c3c2 PA |
5201 | } |
5202 | ||
34b7e8a6 | 5203 | delete_just_stopped_threads_single_step_breakpoints (); |
d03285ec | 5204 | |
e58b0e63 PA |
5205 | /* In case the event is caught by a catchpoint, remember that |
5206 | the event is to be followed at the next resume of the thread, | |
5207 | and not immediately. */ | |
5208 | ecs->event_thread->pending_follow = ecs->ws; | |
5209 | ||
fb14de7b | 5210 | stop_pc = regcache_read_pc (get_thread_regcache (ecs->ptid)); |
675bf4cb | 5211 | |
16c381f0 | 5212 | ecs->event_thread->control.stop_bpstat |
6c95b8df | 5213 | = bpstat_stop_status (get_regcache_aspace (get_current_regcache ()), |
09ac7c10 | 5214 | stop_pc, ecs->ptid, &ecs->ws); |
675bf4cb | 5215 | |
c65d6b55 PA |
5216 | if (handle_stop_requested (ecs)) |
5217 | return; | |
5218 | ||
ce12b012 PA |
5219 | /* If no catchpoint triggered for this, then keep going. Note |
5220 | that we're interested in knowing the bpstat actually causes a | |
5221 | stop, not just if it may explain the signal. Software | |
5222 | watchpoints, for example, always appear in the bpstat. */ | |
5223 | if (!bpstat_causes_stop (ecs->event_thread->control.stop_bpstat)) | |
04e68871 | 5224 | { |
6c95b8df PA |
5225 | ptid_t parent; |
5226 | ptid_t child; | |
e58b0e63 | 5227 | int should_resume; |
3e43a32a MS |
5228 | int follow_child |
5229 | = (follow_fork_mode_string == follow_fork_mode_child); | |
e58b0e63 | 5230 | |
a493e3e2 | 5231 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; |
e58b0e63 PA |
5232 | |
5233 | should_resume = follow_fork (); | |
5234 | ||
6c95b8df PA |
5235 | parent = ecs->ptid; |
5236 | child = ecs->ws.value.related_pid; | |
5237 | ||
a2077e25 PA |
5238 | /* At this point, the parent is marked running, and the |
5239 | child is marked stopped. */ | |
5240 | ||
5241 | /* If not resuming the parent, mark it stopped. */ | |
5242 | if (follow_child && !detach_fork && !non_stop && !sched_multi) | |
5243 | set_running (parent, 0); | |
5244 | ||
5245 | /* If resuming the child, mark it running. */ | |
5246 | if (follow_child || (!detach_fork && (non_stop || sched_multi))) | |
5247 | set_running (child, 1); | |
5248 | ||
6c95b8df | 5249 | /* In non-stop mode, also resume the other branch. */ |
fbea99ea PA |
5250 | if (!detach_fork && (non_stop |
5251 | || (sched_multi && target_is_non_stop_p ()))) | |
6c95b8df PA |
5252 | { |
5253 | if (follow_child) | |
5254 | switch_to_thread (parent); | |
5255 | else | |
5256 | switch_to_thread (child); | |
5257 | ||
5258 | ecs->event_thread = inferior_thread (); | |
5259 | ecs->ptid = inferior_ptid; | |
5260 | keep_going (ecs); | |
5261 | } | |
5262 | ||
5263 | if (follow_child) | |
5264 | switch_to_thread (child); | |
5265 | else | |
5266 | switch_to_thread (parent); | |
5267 | ||
e58b0e63 PA |
5268 | ecs->event_thread = inferior_thread (); |
5269 | ecs->ptid = inferior_ptid; | |
5270 | ||
5271 | if (should_resume) | |
5272 | keep_going (ecs); | |
5273 | else | |
22bcd14b | 5274 | stop_waiting (ecs); |
04e68871 DJ |
5275 | return; |
5276 | } | |
94c57d6a PA |
5277 | process_event_stop_test (ecs); |
5278 | return; | |
488f131b | 5279 | |
6c95b8df PA |
5280 | case TARGET_WAITKIND_VFORK_DONE: |
5281 | /* Done with the shared memory region. Re-insert breakpoints in | |
5282 | the parent, and keep going. */ | |
5283 | ||
5284 | if (debug_infrun) | |
3e43a32a MS |
5285 | fprintf_unfiltered (gdb_stdlog, |
5286 | "infrun: TARGET_WAITKIND_VFORK_DONE\n"); | |
6c95b8df PA |
5287 | |
5288 | if (!ptid_equal (ecs->ptid, inferior_ptid)) | |
5289 | context_switch (ecs->ptid); | |
5290 | ||
5291 | current_inferior ()->waiting_for_vfork_done = 0; | |
56710373 | 5292 | current_inferior ()->pspace->breakpoints_not_allowed = 0; |
c65d6b55 PA |
5293 | |
5294 | if (handle_stop_requested (ecs)) | |
5295 | return; | |
5296 | ||
6c95b8df PA |
5297 | /* This also takes care of reinserting breakpoints in the |
5298 | previously locked inferior. */ | |
5299 | keep_going (ecs); | |
5300 | return; | |
5301 | ||
488f131b | 5302 | case TARGET_WAITKIND_EXECD: |
527159b7 | 5303 | if (debug_infrun) |
fc5261f2 | 5304 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_EXECD\n"); |
488f131b | 5305 | |
cbd2b4e3 PA |
5306 | /* Note we can't read registers yet (the stop_pc), because we |
5307 | don't yet know the inferior's post-exec architecture. | |
5308 | 'stop_pc' is explicitly read below instead. */ | |
5a2901d9 | 5309 | if (!ptid_equal (ecs->ptid, inferior_ptid)) |
cbd2b4e3 | 5310 | switch_to_thread_no_regs (ecs->event_thread); |
5a2901d9 | 5311 | |
6c95b8df PA |
5312 | /* Do whatever is necessary to the parent branch of the vfork. */ |
5313 | handle_vfork_child_exec_or_exit (1); | |
5314 | ||
795e548f PA |
5315 | /* This causes the eventpoints and symbol table to be reset. |
5316 | Must do this now, before trying to determine whether to | |
5317 | stop. */ | |
71b43ef8 | 5318 | follow_exec (inferior_ptid, ecs->ws.value.execd_pathname); |
795e548f | 5319 | |
1bb7c059 SM |
5320 | stop_pc = regcache_read_pc (get_thread_regcache (ecs->ptid)); |
5321 | ||
17d8546e DB |
5322 | /* In follow_exec we may have deleted the original thread and |
5323 | created a new one. Make sure that the event thread is the | |
5324 | execd thread for that case (this is a nop otherwise). */ | |
5325 | ecs->event_thread = inferior_thread (); | |
5326 | ||
16c381f0 | 5327 | ecs->event_thread->control.stop_bpstat |
6c95b8df | 5328 | = bpstat_stop_status (get_regcache_aspace (get_current_regcache ()), |
09ac7c10 | 5329 | stop_pc, ecs->ptid, &ecs->ws); |
795e548f | 5330 | |
71b43ef8 PA |
5331 | /* Note that this may be referenced from inside |
5332 | bpstat_stop_status above, through inferior_has_execd. */ | |
5333 | xfree (ecs->ws.value.execd_pathname); | |
5334 | ecs->ws.value.execd_pathname = NULL; | |
5335 | ||
c65d6b55 PA |
5336 | if (handle_stop_requested (ecs)) |
5337 | return; | |
5338 | ||
04e68871 | 5339 | /* If no catchpoint triggered for this, then keep going. */ |
ce12b012 | 5340 | if (!bpstat_causes_stop (ecs->event_thread->control.stop_bpstat)) |
04e68871 | 5341 | { |
a493e3e2 | 5342 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; |
04e68871 DJ |
5343 | keep_going (ecs); |
5344 | return; | |
5345 | } | |
94c57d6a PA |
5346 | process_event_stop_test (ecs); |
5347 | return; | |
488f131b | 5348 | |
b4dc5ffa MK |
5349 | /* Be careful not to try to gather much state about a thread |
5350 | that's in a syscall. It's frequently a losing proposition. */ | |
488f131b | 5351 | case TARGET_WAITKIND_SYSCALL_ENTRY: |
527159b7 | 5352 | if (debug_infrun) |
3e43a32a MS |
5353 | fprintf_unfiltered (gdb_stdlog, |
5354 | "infrun: TARGET_WAITKIND_SYSCALL_ENTRY\n"); | |
1777feb0 | 5355 | /* Getting the current syscall number. */ |
94c57d6a PA |
5356 | if (handle_syscall_event (ecs) == 0) |
5357 | process_event_stop_test (ecs); | |
5358 | return; | |
c906108c | 5359 | |
488f131b JB |
5360 | /* Before examining the threads further, step this thread to |
5361 | get it entirely out of the syscall. (We get notice of the | |
5362 | event when the thread is just on the verge of exiting a | |
5363 | syscall. Stepping one instruction seems to get it back | |
b4dc5ffa | 5364 | into user code.) */ |
488f131b | 5365 | case TARGET_WAITKIND_SYSCALL_RETURN: |
527159b7 | 5366 | if (debug_infrun) |
3e43a32a MS |
5367 | fprintf_unfiltered (gdb_stdlog, |
5368 | "infrun: TARGET_WAITKIND_SYSCALL_RETURN\n"); | |
94c57d6a PA |
5369 | if (handle_syscall_event (ecs) == 0) |
5370 | process_event_stop_test (ecs); | |
5371 | return; | |
c906108c | 5372 | |
488f131b | 5373 | case TARGET_WAITKIND_STOPPED: |
527159b7 | 5374 | if (debug_infrun) |
8a9de0e4 | 5375 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_STOPPED\n"); |
4f5d7f63 PA |
5376 | handle_signal_stop (ecs); |
5377 | return; | |
c906108c | 5378 | |
b2175913 | 5379 | case TARGET_WAITKIND_NO_HISTORY: |
4b4e080e PA |
5380 | if (debug_infrun) |
5381 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_NO_HISTORY\n"); | |
b2175913 | 5382 | /* Reverse execution: target ran out of history info. */ |
eab402df | 5383 | |
d1988021 MM |
5384 | /* Switch to the stopped thread. */ |
5385 | if (!ptid_equal (ecs->ptid, inferior_ptid)) | |
5386 | context_switch (ecs->ptid); | |
5387 | if (debug_infrun) | |
5388 | fprintf_unfiltered (gdb_stdlog, "infrun: stopped\n"); | |
5389 | ||
34b7e8a6 | 5390 | delete_just_stopped_threads_single_step_breakpoints (); |
d1988021 | 5391 | stop_pc = regcache_read_pc (get_thread_regcache (inferior_ptid)); |
c65d6b55 PA |
5392 | |
5393 | if (handle_stop_requested (ecs)) | |
5394 | return; | |
5395 | ||
fd664c91 | 5396 | observer_notify_no_history (); |
22bcd14b | 5397 | stop_waiting (ecs); |
b2175913 | 5398 | return; |
488f131b | 5399 | } |
4f5d7f63 PA |
5400 | } |
5401 | ||
0b6e5e10 JB |
5402 | /* A wrapper around handle_inferior_event_1, which also makes sure |
5403 | that all temporary struct value objects that were created during | |
5404 | the handling of the event get deleted at the end. */ | |
5405 | ||
5406 | static void | |
5407 | handle_inferior_event (struct execution_control_state *ecs) | |
5408 | { | |
5409 | struct value *mark = value_mark (); | |
5410 | ||
5411 | handle_inferior_event_1 (ecs); | |
5412 | /* Purge all temporary values created during the event handling, | |
5413 | as it could be a long time before we return to the command level | |
5414 | where such values would otherwise be purged. */ | |
5415 | value_free_to_mark (mark); | |
5416 | } | |
5417 | ||
372316f1 PA |
5418 | /* Restart threads back to what they were trying to do back when we |
5419 | paused them for an in-line step-over. The EVENT_THREAD thread is | |
5420 | ignored. */ | |
4d9d9d04 PA |
5421 | |
5422 | static void | |
372316f1 PA |
5423 | restart_threads (struct thread_info *event_thread) |
5424 | { | |
5425 | struct thread_info *tp; | |
372316f1 PA |
5426 | |
5427 | /* In case the instruction just stepped spawned a new thread. */ | |
5428 | update_thread_list (); | |
5429 | ||
5430 | ALL_NON_EXITED_THREADS (tp) | |
5431 | { | |
5432 | if (tp == event_thread) | |
5433 | { | |
5434 | if (debug_infrun) | |
5435 | fprintf_unfiltered (gdb_stdlog, | |
5436 | "infrun: restart threads: " | |
5437 | "[%s] is event thread\n", | |
5438 | target_pid_to_str (tp->ptid)); | |
5439 | continue; | |
5440 | } | |
5441 | ||
5442 | if (!(tp->state == THREAD_RUNNING || tp->control.in_infcall)) | |
5443 | { | |
5444 | if (debug_infrun) | |
5445 | fprintf_unfiltered (gdb_stdlog, | |
5446 | "infrun: restart threads: " | |
5447 | "[%s] not meant to be running\n", | |
5448 | target_pid_to_str (tp->ptid)); | |
5449 | continue; | |
5450 | } | |
5451 | ||
5452 | if (tp->resumed) | |
5453 | { | |
5454 | if (debug_infrun) | |
5455 | fprintf_unfiltered (gdb_stdlog, | |
5456 | "infrun: restart threads: [%s] resumed\n", | |
5457 | target_pid_to_str (tp->ptid)); | |
5458 | gdb_assert (tp->executing || tp->suspend.waitstatus_pending_p); | |
5459 | continue; | |
5460 | } | |
5461 | ||
5462 | if (thread_is_in_step_over_chain (tp)) | |
5463 | { | |
5464 | if (debug_infrun) | |
5465 | fprintf_unfiltered (gdb_stdlog, | |
5466 | "infrun: restart threads: " | |
5467 | "[%s] needs step-over\n", | |
5468 | target_pid_to_str (tp->ptid)); | |
5469 | gdb_assert (!tp->resumed); | |
5470 | continue; | |
5471 | } | |
5472 | ||
5473 | ||
5474 | if (tp->suspend.waitstatus_pending_p) | |
5475 | { | |
5476 | if (debug_infrun) | |
5477 | fprintf_unfiltered (gdb_stdlog, | |
5478 | "infrun: restart threads: " | |
5479 | "[%s] has pending status\n", | |
5480 | target_pid_to_str (tp->ptid)); | |
5481 | tp->resumed = 1; | |
5482 | continue; | |
5483 | } | |
5484 | ||
c65d6b55 PA |
5485 | gdb_assert (!tp->stop_requested); |
5486 | ||
372316f1 PA |
5487 | /* If some thread needs to start a step-over at this point, it |
5488 | should still be in the step-over queue, and thus skipped | |
5489 | above. */ | |
5490 | if (thread_still_needs_step_over (tp)) | |
5491 | { | |
5492 | internal_error (__FILE__, __LINE__, | |
5493 | "thread [%s] needs a step-over, but not in " | |
5494 | "step-over queue\n", | |
5495 | target_pid_to_str (tp->ptid)); | |
5496 | } | |
5497 | ||
5498 | if (currently_stepping (tp)) | |
5499 | { | |
5500 | if (debug_infrun) | |
5501 | fprintf_unfiltered (gdb_stdlog, | |
5502 | "infrun: restart threads: [%s] was stepping\n", | |
5503 | target_pid_to_str (tp->ptid)); | |
5504 | keep_going_stepped_thread (tp); | |
5505 | } | |
5506 | else | |
5507 | { | |
5508 | struct execution_control_state ecss; | |
5509 | struct execution_control_state *ecs = &ecss; | |
5510 | ||
5511 | if (debug_infrun) | |
5512 | fprintf_unfiltered (gdb_stdlog, | |
5513 | "infrun: restart threads: [%s] continuing\n", | |
5514 | target_pid_to_str (tp->ptid)); | |
5515 | reset_ecs (ecs, tp); | |
5516 | switch_to_thread (tp->ptid); | |
5517 | keep_going_pass_signal (ecs); | |
5518 | } | |
5519 | } | |
5520 | } | |
5521 | ||
5522 | /* Callback for iterate_over_threads. Find a resumed thread that has | |
5523 | a pending waitstatus. */ | |
5524 | ||
5525 | static int | |
5526 | resumed_thread_with_pending_status (struct thread_info *tp, | |
5527 | void *arg) | |
5528 | { | |
5529 | return (tp->resumed | |
5530 | && tp->suspend.waitstatus_pending_p); | |
5531 | } | |
5532 | ||
5533 | /* Called when we get an event that may finish an in-line or | |
5534 | out-of-line (displaced stepping) step-over started previously. | |
5535 | Return true if the event is processed and we should go back to the | |
5536 | event loop; false if the caller should continue processing the | |
5537 | event. */ | |
5538 | ||
5539 | static int | |
4d9d9d04 PA |
5540 | finish_step_over (struct execution_control_state *ecs) |
5541 | { | |
372316f1 PA |
5542 | int had_step_over_info; |
5543 | ||
4d9d9d04 PA |
5544 | displaced_step_fixup (ecs->ptid, |
5545 | ecs->event_thread->suspend.stop_signal); | |
5546 | ||
372316f1 PA |
5547 | had_step_over_info = step_over_info_valid_p (); |
5548 | ||
5549 | if (had_step_over_info) | |
4d9d9d04 PA |
5550 | { |
5551 | /* If we're stepping over a breakpoint with all threads locked, | |
5552 | then only the thread that was stepped should be reporting | |
5553 | back an event. */ | |
5554 | gdb_assert (ecs->event_thread->control.trap_expected); | |
5555 | ||
c65d6b55 | 5556 | clear_step_over_info (); |
4d9d9d04 PA |
5557 | } |
5558 | ||
fbea99ea | 5559 | if (!target_is_non_stop_p ()) |
372316f1 | 5560 | return 0; |
4d9d9d04 PA |
5561 | |
5562 | /* Start a new step-over in another thread if there's one that | |
5563 | needs it. */ | |
5564 | start_step_over (); | |
372316f1 PA |
5565 | |
5566 | /* If we were stepping over a breakpoint before, and haven't started | |
5567 | a new in-line step-over sequence, then restart all other threads | |
5568 | (except the event thread). We can't do this in all-stop, as then | |
5569 | e.g., we wouldn't be able to issue any other remote packet until | |
5570 | these other threads stop. */ | |
5571 | if (had_step_over_info && !step_over_info_valid_p ()) | |
5572 | { | |
5573 | struct thread_info *pending; | |
5574 | ||
5575 | /* If we only have threads with pending statuses, the restart | |
5576 | below won't restart any thread and so nothing re-inserts the | |
5577 | breakpoint we just stepped over. But we need it inserted | |
5578 | when we later process the pending events, otherwise if | |
5579 | another thread has a pending event for this breakpoint too, | |
5580 | we'd discard its event (because the breakpoint that | |
5581 | originally caused the event was no longer inserted). */ | |
5582 | context_switch (ecs->ptid); | |
5583 | insert_breakpoints (); | |
5584 | ||
5585 | restart_threads (ecs->event_thread); | |
5586 | ||
5587 | /* If we have events pending, go through handle_inferior_event | |
5588 | again, picking up a pending event at random. This avoids | |
5589 | thread starvation. */ | |
5590 | ||
5591 | /* But not if we just stepped over a watchpoint in order to let | |
5592 | the instruction execute so we can evaluate its expression. | |
5593 | The set of watchpoints that triggered is recorded in the | |
5594 | breakpoint objects themselves (see bp->watchpoint_triggered). | |
5595 | If we processed another event first, that other event could | |
5596 | clobber this info. */ | |
5597 | if (ecs->event_thread->stepping_over_watchpoint) | |
5598 | return 0; | |
5599 | ||
5600 | pending = iterate_over_threads (resumed_thread_with_pending_status, | |
5601 | NULL); | |
5602 | if (pending != NULL) | |
5603 | { | |
5604 | struct thread_info *tp = ecs->event_thread; | |
5605 | struct regcache *regcache; | |
5606 | ||
5607 | if (debug_infrun) | |
5608 | { | |
5609 | fprintf_unfiltered (gdb_stdlog, | |
5610 | "infrun: found resumed threads with " | |
5611 | "pending events, saving status\n"); | |
5612 | } | |
5613 | ||
5614 | gdb_assert (pending != tp); | |
5615 | ||
5616 | /* Record the event thread's event for later. */ | |
5617 | save_waitstatus (tp, &ecs->ws); | |
5618 | /* This was cleared early, by handle_inferior_event. Set it | |
5619 | so this pending event is considered by | |
5620 | do_target_wait. */ | |
5621 | tp->resumed = 1; | |
5622 | ||
5623 | gdb_assert (!tp->executing); | |
5624 | ||
5625 | regcache = get_thread_regcache (tp->ptid); | |
5626 | tp->suspend.stop_pc = regcache_read_pc (regcache); | |
5627 | ||
5628 | if (debug_infrun) | |
5629 | { | |
5630 | fprintf_unfiltered (gdb_stdlog, | |
5631 | "infrun: saved stop_pc=%s for %s " | |
5632 | "(currently_stepping=%d)\n", | |
5633 | paddress (target_gdbarch (), | |
5634 | tp->suspend.stop_pc), | |
5635 | target_pid_to_str (tp->ptid), | |
5636 | currently_stepping (tp)); | |
5637 | } | |
5638 | ||
5639 | /* This in-line step-over finished; clear this so we won't | |
5640 | start a new one. This is what handle_signal_stop would | |
5641 | do, if we returned false. */ | |
5642 | tp->stepping_over_breakpoint = 0; | |
5643 | ||
5644 | /* Wake up the event loop again. */ | |
5645 | mark_async_event_handler (infrun_async_inferior_event_token); | |
5646 | ||
5647 | prepare_to_wait (ecs); | |
5648 | return 1; | |
5649 | } | |
5650 | } | |
5651 | ||
5652 | return 0; | |
4d9d9d04 PA |
5653 | } |
5654 | ||
4f5d7f63 PA |
5655 | /* Come here when the program has stopped with a signal. */ |
5656 | ||
5657 | static void | |
5658 | handle_signal_stop (struct execution_control_state *ecs) | |
5659 | { | |
5660 | struct frame_info *frame; | |
5661 | struct gdbarch *gdbarch; | |
5662 | int stopped_by_watchpoint; | |
5663 | enum stop_kind stop_soon; | |
5664 | int random_signal; | |
c906108c | 5665 | |
f0407826 DE |
5666 | gdb_assert (ecs->ws.kind == TARGET_WAITKIND_STOPPED); |
5667 | ||
c65d6b55 PA |
5668 | ecs->event_thread->suspend.stop_signal = ecs->ws.value.sig; |
5669 | ||
f0407826 DE |
5670 | /* Do we need to clean up the state of a thread that has |
5671 | completed a displaced single-step? (Doing so usually affects | |
5672 | the PC, so do it here, before we set stop_pc.) */ | |
372316f1 PA |
5673 | if (finish_step_over (ecs)) |
5674 | return; | |
f0407826 DE |
5675 | |
5676 | /* If we either finished a single-step or hit a breakpoint, but | |
5677 | the user wanted this thread to be stopped, pretend we got a | |
5678 | SIG0 (generic unsignaled stop). */ | |
5679 | if (ecs->event_thread->stop_requested | |
5680 | && ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP) | |
5681 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; | |
237fc4c9 | 5682 | |
515630c5 | 5683 | stop_pc = regcache_read_pc (get_thread_regcache (ecs->ptid)); |
488f131b | 5684 | |
527159b7 | 5685 | if (debug_infrun) |
237fc4c9 | 5686 | { |
5af949e3 UW |
5687 | struct regcache *regcache = get_thread_regcache (ecs->ptid); |
5688 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
2989a365 | 5689 | scoped_restore save_inferior_ptid = make_scoped_restore (&inferior_ptid); |
7f82dfc7 JK |
5690 | |
5691 | inferior_ptid = ecs->ptid; | |
5af949e3 UW |
5692 | |
5693 | fprintf_unfiltered (gdb_stdlog, "infrun: stop_pc = %s\n", | |
5694 | paddress (gdbarch, stop_pc)); | |
d92524f1 | 5695 | if (target_stopped_by_watchpoint ()) |
237fc4c9 PA |
5696 | { |
5697 | CORE_ADDR addr; | |
abbb1732 | 5698 | |
237fc4c9 PA |
5699 | fprintf_unfiltered (gdb_stdlog, "infrun: stopped by watchpoint\n"); |
5700 | ||
5701 | if (target_stopped_data_address (¤t_target, &addr)) | |
5702 | fprintf_unfiltered (gdb_stdlog, | |
5af949e3 UW |
5703 | "infrun: stopped data address = %s\n", |
5704 | paddress (gdbarch, addr)); | |
237fc4c9 PA |
5705 | else |
5706 | fprintf_unfiltered (gdb_stdlog, | |
5707 | "infrun: (no data address available)\n"); | |
5708 | } | |
5709 | } | |
527159b7 | 5710 | |
36fa8042 PA |
5711 | /* This is originated from start_remote(), start_inferior() and |
5712 | shared libraries hook functions. */ | |
5713 | stop_soon = get_inferior_stop_soon (ecs->ptid); | |
5714 | if (stop_soon == STOP_QUIETLY || stop_soon == STOP_QUIETLY_REMOTE) | |
5715 | { | |
5716 | if (!ptid_equal (ecs->ptid, inferior_ptid)) | |
5717 | context_switch (ecs->ptid); | |
5718 | if (debug_infrun) | |
5719 | fprintf_unfiltered (gdb_stdlog, "infrun: quietly stopped\n"); | |
5720 | stop_print_frame = 1; | |
22bcd14b | 5721 | stop_waiting (ecs); |
36fa8042 PA |
5722 | return; |
5723 | } | |
5724 | ||
36fa8042 PA |
5725 | /* This originates from attach_command(). We need to overwrite |
5726 | the stop_signal here, because some kernels don't ignore a | |
5727 | SIGSTOP in a subsequent ptrace(PTRACE_CONT,SIGSTOP) call. | |
5728 | See more comments in inferior.h. On the other hand, if we | |
5729 | get a non-SIGSTOP, report it to the user - assume the backend | |
5730 | will handle the SIGSTOP if it should show up later. | |
5731 | ||
5732 | Also consider that the attach is complete when we see a | |
5733 | SIGTRAP. Some systems (e.g. Windows), and stubs supporting | |
5734 | target extended-remote report it instead of a SIGSTOP | |
5735 | (e.g. gdbserver). We already rely on SIGTRAP being our | |
5736 | signal, so this is no exception. | |
5737 | ||
5738 | Also consider that the attach is complete when we see a | |
5739 | GDB_SIGNAL_0. In non-stop mode, GDB will explicitly tell | |
5740 | the target to stop all threads of the inferior, in case the | |
5741 | low level attach operation doesn't stop them implicitly. If | |
5742 | they weren't stopped implicitly, then the stub will report a | |
5743 | GDB_SIGNAL_0, meaning: stopped for no particular reason | |
5744 | other than GDB's request. */ | |
5745 | if (stop_soon == STOP_QUIETLY_NO_SIGSTOP | |
5746 | && (ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_STOP | |
5747 | || ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP | |
5748 | || ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_0)) | |
5749 | { | |
5750 | stop_print_frame = 1; | |
22bcd14b | 5751 | stop_waiting (ecs); |
36fa8042 PA |
5752 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; |
5753 | return; | |
5754 | } | |
5755 | ||
488f131b | 5756 | /* See if something interesting happened to the non-current thread. If |
b40c7d58 DJ |
5757 | so, then switch to that thread. */ |
5758 | if (!ptid_equal (ecs->ptid, inferior_ptid)) | |
488f131b | 5759 | { |
527159b7 | 5760 | if (debug_infrun) |
8a9de0e4 | 5761 | fprintf_unfiltered (gdb_stdlog, "infrun: context switch\n"); |
527159b7 | 5762 | |
0d1e5fa7 | 5763 | context_switch (ecs->ptid); |
c5aa993b | 5764 | |
9a4105ab | 5765 | if (deprecated_context_hook) |
5d5658a1 | 5766 | deprecated_context_hook (ptid_to_global_thread_id (ecs->ptid)); |
488f131b | 5767 | } |
c906108c | 5768 | |
568d6575 UW |
5769 | /* At this point, get hold of the now-current thread's frame. */ |
5770 | frame = get_current_frame (); | |
5771 | gdbarch = get_frame_arch (frame); | |
5772 | ||
2adfaa28 | 5773 | /* Pull the single step breakpoints out of the target. */ |
af48d08f | 5774 | if (ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP) |
488f131b | 5775 | { |
af48d08f PA |
5776 | struct regcache *regcache; |
5777 | struct address_space *aspace; | |
5778 | CORE_ADDR pc; | |
2adfaa28 | 5779 | |
af48d08f PA |
5780 | regcache = get_thread_regcache (ecs->ptid); |
5781 | aspace = get_regcache_aspace (regcache); | |
5782 | pc = regcache_read_pc (regcache); | |
34b7e8a6 | 5783 | |
af48d08f PA |
5784 | /* However, before doing so, if this single-step breakpoint was |
5785 | actually for another thread, set this thread up for moving | |
5786 | past it. */ | |
5787 | if (!thread_has_single_step_breakpoint_here (ecs->event_thread, | |
5788 | aspace, pc)) | |
5789 | { | |
5790 | if (single_step_breakpoint_inserted_here_p (aspace, pc)) | |
2adfaa28 PA |
5791 | { |
5792 | if (debug_infrun) | |
5793 | { | |
5794 | fprintf_unfiltered (gdb_stdlog, | |
af48d08f | 5795 | "infrun: [%s] hit another thread's " |
34b7e8a6 PA |
5796 | "single-step breakpoint\n", |
5797 | target_pid_to_str (ecs->ptid)); | |
2adfaa28 | 5798 | } |
af48d08f PA |
5799 | ecs->hit_singlestep_breakpoint = 1; |
5800 | } | |
5801 | } | |
5802 | else | |
5803 | { | |
5804 | if (debug_infrun) | |
5805 | { | |
5806 | fprintf_unfiltered (gdb_stdlog, | |
5807 | "infrun: [%s] hit its " | |
5808 | "single-step breakpoint\n", | |
5809 | target_pid_to_str (ecs->ptid)); | |
2adfaa28 PA |
5810 | } |
5811 | } | |
488f131b | 5812 | } |
af48d08f | 5813 | delete_just_stopped_threads_single_step_breakpoints (); |
c906108c | 5814 | |
963f9c80 PA |
5815 | if (ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP |
5816 | && ecs->event_thread->control.trap_expected | |
5817 | && ecs->event_thread->stepping_over_watchpoint) | |
d983da9c DJ |
5818 | stopped_by_watchpoint = 0; |
5819 | else | |
5820 | stopped_by_watchpoint = watchpoints_triggered (&ecs->ws); | |
5821 | ||
5822 | /* If necessary, step over this watchpoint. We'll be back to display | |
5823 | it in a moment. */ | |
5824 | if (stopped_by_watchpoint | |
d92524f1 | 5825 | && (target_have_steppable_watchpoint |
568d6575 | 5826 | || gdbarch_have_nonsteppable_watchpoint (gdbarch))) |
488f131b | 5827 | { |
488f131b JB |
5828 | /* At this point, we are stopped at an instruction which has |
5829 | attempted to write to a piece of memory under control of | |
5830 | a watchpoint. The instruction hasn't actually executed | |
5831 | yet. If we were to evaluate the watchpoint expression | |
5832 | now, we would get the old value, and therefore no change | |
5833 | would seem to have occurred. | |
5834 | ||
5835 | In order to make watchpoints work `right', we really need | |
5836 | to complete the memory write, and then evaluate the | |
d983da9c DJ |
5837 | watchpoint expression. We do this by single-stepping the |
5838 | target. | |
5839 | ||
7f89fd65 | 5840 | It may not be necessary to disable the watchpoint to step over |
d983da9c DJ |
5841 | it. For example, the PA can (with some kernel cooperation) |
5842 | single step over a watchpoint without disabling the watchpoint. | |
5843 | ||
5844 | It is far more common to need to disable a watchpoint to step | |
5845 | the inferior over it. If we have non-steppable watchpoints, | |
5846 | we must disable the current watchpoint; it's simplest to | |
963f9c80 PA |
5847 | disable all watchpoints. |
5848 | ||
5849 | Any breakpoint at PC must also be stepped over -- if there's | |
5850 | one, it will have already triggered before the watchpoint | |
5851 | triggered, and we either already reported it to the user, or | |
5852 | it didn't cause a stop and we called keep_going. In either | |
5853 | case, if there was a breakpoint at PC, we must be trying to | |
5854 | step past it. */ | |
5855 | ecs->event_thread->stepping_over_watchpoint = 1; | |
5856 | keep_going (ecs); | |
488f131b JB |
5857 | return; |
5858 | } | |
5859 | ||
4e1c45ea | 5860 | ecs->event_thread->stepping_over_breakpoint = 0; |
963f9c80 | 5861 | ecs->event_thread->stepping_over_watchpoint = 0; |
16c381f0 JK |
5862 | bpstat_clear (&ecs->event_thread->control.stop_bpstat); |
5863 | ecs->event_thread->control.stop_step = 0; | |
488f131b | 5864 | stop_print_frame = 1; |
488f131b | 5865 | stopped_by_random_signal = 0; |
488f131b | 5866 | |
edb3359d DJ |
5867 | /* Hide inlined functions starting here, unless we just performed stepi or |
5868 | nexti. After stepi and nexti, always show the innermost frame (not any | |
5869 | inline function call sites). */ | |
16c381f0 | 5870 | if (ecs->event_thread->control.step_range_end != 1) |
0574c78f GB |
5871 | { |
5872 | struct address_space *aspace = | |
5873 | get_regcache_aspace (get_thread_regcache (ecs->ptid)); | |
5874 | ||
5875 | /* skip_inline_frames is expensive, so we avoid it if we can | |
5876 | determine that the address is one where functions cannot have | |
5877 | been inlined. This improves performance with inferiors that | |
5878 | load a lot of shared libraries, because the solib event | |
5879 | breakpoint is defined as the address of a function (i.e. not | |
5880 | inline). Note that we have to check the previous PC as well | |
5881 | as the current one to catch cases when we have just | |
5882 | single-stepped off a breakpoint prior to reinstating it. | |
5883 | Note that we're assuming that the code we single-step to is | |
5884 | not inline, but that's not definitive: there's nothing | |
5885 | preventing the event breakpoint function from containing | |
5886 | inlined code, and the single-step ending up there. If the | |
5887 | user had set a breakpoint on that inlined code, the missing | |
5888 | skip_inline_frames call would break things. Fortunately | |
5889 | that's an extremely unlikely scenario. */ | |
09ac7c10 | 5890 | if (!pc_at_non_inline_function (aspace, stop_pc, &ecs->ws) |
a210c238 MR |
5891 | && !(ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP |
5892 | && ecs->event_thread->control.trap_expected | |
5893 | && pc_at_non_inline_function (aspace, | |
5894 | ecs->event_thread->prev_pc, | |
09ac7c10 | 5895 | &ecs->ws))) |
1c5a993e MR |
5896 | { |
5897 | skip_inline_frames (ecs->ptid); | |
5898 | ||
5899 | /* Re-fetch current thread's frame in case that invalidated | |
5900 | the frame cache. */ | |
5901 | frame = get_current_frame (); | |
5902 | gdbarch = get_frame_arch (frame); | |
5903 | } | |
0574c78f | 5904 | } |
edb3359d | 5905 | |
a493e3e2 | 5906 | if (ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP |
16c381f0 | 5907 | && ecs->event_thread->control.trap_expected |
568d6575 | 5908 | && gdbarch_single_step_through_delay_p (gdbarch) |
4e1c45ea | 5909 | && currently_stepping (ecs->event_thread)) |
3352ef37 | 5910 | { |
b50d7442 | 5911 | /* We're trying to step off a breakpoint. Turns out that we're |
3352ef37 | 5912 | also on an instruction that needs to be stepped multiple |
1777feb0 | 5913 | times before it's been fully executing. E.g., architectures |
3352ef37 AC |
5914 | with a delay slot. It needs to be stepped twice, once for |
5915 | the instruction and once for the delay slot. */ | |
5916 | int step_through_delay | |
568d6575 | 5917 | = gdbarch_single_step_through_delay (gdbarch, frame); |
abbb1732 | 5918 | |
527159b7 | 5919 | if (debug_infrun && step_through_delay) |
8a9de0e4 | 5920 | fprintf_unfiltered (gdb_stdlog, "infrun: step through delay\n"); |
16c381f0 JK |
5921 | if (ecs->event_thread->control.step_range_end == 0 |
5922 | && step_through_delay) | |
3352ef37 AC |
5923 | { |
5924 | /* The user issued a continue when stopped at a breakpoint. | |
5925 | Set up for another trap and get out of here. */ | |
4e1c45ea | 5926 | ecs->event_thread->stepping_over_breakpoint = 1; |
3352ef37 AC |
5927 | keep_going (ecs); |
5928 | return; | |
5929 | } | |
5930 | else if (step_through_delay) | |
5931 | { | |
5932 | /* The user issued a step when stopped at a breakpoint. | |
5933 | Maybe we should stop, maybe we should not - the delay | |
5934 | slot *might* correspond to a line of source. In any | |
ca67fcb8 VP |
5935 | case, don't decide that here, just set |
5936 | ecs->stepping_over_breakpoint, making sure we | |
5937 | single-step again before breakpoints are re-inserted. */ | |
4e1c45ea | 5938 | ecs->event_thread->stepping_over_breakpoint = 1; |
3352ef37 AC |
5939 | } |
5940 | } | |
5941 | ||
ab04a2af TT |
5942 | /* See if there is a breakpoint/watchpoint/catchpoint/etc. that |
5943 | handles this event. */ | |
5944 | ecs->event_thread->control.stop_bpstat | |
5945 | = bpstat_stop_status (get_regcache_aspace (get_current_regcache ()), | |
5946 | stop_pc, ecs->ptid, &ecs->ws); | |
db82e815 | 5947 | |
ab04a2af TT |
5948 | /* Following in case break condition called a |
5949 | function. */ | |
5950 | stop_print_frame = 1; | |
73dd234f | 5951 | |
ab04a2af TT |
5952 | /* This is where we handle "moribund" watchpoints. Unlike |
5953 | software breakpoints traps, hardware watchpoint traps are | |
5954 | always distinguishable from random traps. If no high-level | |
5955 | watchpoint is associated with the reported stop data address | |
5956 | anymore, then the bpstat does not explain the signal --- | |
5957 | simply make sure to ignore it if `stopped_by_watchpoint' is | |
5958 | set. */ | |
5959 | ||
5960 | if (debug_infrun | |
5961 | && ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP | |
47591c29 | 5962 | && !bpstat_explains_signal (ecs->event_thread->control.stop_bpstat, |
427cd150 | 5963 | GDB_SIGNAL_TRAP) |
ab04a2af TT |
5964 | && stopped_by_watchpoint) |
5965 | fprintf_unfiltered (gdb_stdlog, | |
5966 | "infrun: no user watchpoint explains " | |
5967 | "watchpoint SIGTRAP, ignoring\n"); | |
73dd234f | 5968 | |
bac7d97b | 5969 | /* NOTE: cagney/2003-03-29: These checks for a random signal |
ab04a2af TT |
5970 | at one stage in the past included checks for an inferior |
5971 | function call's call dummy's return breakpoint. The original | |
5972 | comment, that went with the test, read: | |
03cebad2 | 5973 | |
ab04a2af TT |
5974 | ``End of a stack dummy. Some systems (e.g. Sony news) give |
5975 | another signal besides SIGTRAP, so check here as well as | |
5976 | above.'' | |
73dd234f | 5977 | |
ab04a2af TT |
5978 | If someone ever tries to get call dummys on a |
5979 | non-executable stack to work (where the target would stop | |
5980 | with something like a SIGSEGV), then those tests might need | |
5981 | to be re-instated. Given, however, that the tests were only | |
5982 | enabled when momentary breakpoints were not being used, I | |
5983 | suspect that it won't be the case. | |
488f131b | 5984 | |
ab04a2af TT |
5985 | NOTE: kettenis/2004-02-05: Indeed such checks don't seem to |
5986 | be necessary for call dummies on a non-executable stack on | |
5987 | SPARC. */ | |
488f131b | 5988 | |
bac7d97b | 5989 | /* See if the breakpoints module can explain the signal. */ |
47591c29 PA |
5990 | random_signal |
5991 | = !bpstat_explains_signal (ecs->event_thread->control.stop_bpstat, | |
5992 | ecs->event_thread->suspend.stop_signal); | |
bac7d97b | 5993 | |
1cf4d951 PA |
5994 | /* Maybe this was a trap for a software breakpoint that has since |
5995 | been removed. */ | |
5996 | if (random_signal && target_stopped_by_sw_breakpoint ()) | |
5997 | { | |
5998 | if (program_breakpoint_here_p (gdbarch, stop_pc)) | |
5999 | { | |
6000 | struct regcache *regcache; | |
6001 | int decr_pc; | |
6002 | ||
6003 | /* Re-adjust PC to what the program would see if GDB was not | |
6004 | debugging it. */ | |
6005 | regcache = get_thread_regcache (ecs->event_thread->ptid); | |
527a273a | 6006 | decr_pc = gdbarch_decr_pc_after_break (gdbarch); |
1cf4d951 PA |
6007 | if (decr_pc != 0) |
6008 | { | |
07036511 TT |
6009 | gdb::optional<scoped_restore_tmpl<int>> |
6010 | restore_operation_disable; | |
1cf4d951 PA |
6011 | |
6012 | if (record_full_is_used ()) | |
07036511 TT |
6013 | restore_operation_disable.emplace |
6014 | (record_full_gdb_operation_disable_set ()); | |
1cf4d951 PA |
6015 | |
6016 | regcache_write_pc (regcache, stop_pc + decr_pc); | |
1cf4d951 PA |
6017 | } |
6018 | } | |
6019 | else | |
6020 | { | |
6021 | /* A delayed software breakpoint event. Ignore the trap. */ | |
6022 | if (debug_infrun) | |
6023 | fprintf_unfiltered (gdb_stdlog, | |
6024 | "infrun: delayed software breakpoint " | |
6025 | "trap, ignoring\n"); | |
6026 | random_signal = 0; | |
6027 | } | |
6028 | } | |
6029 | ||
6030 | /* Maybe this was a trap for a hardware breakpoint/watchpoint that | |
6031 | has since been removed. */ | |
6032 | if (random_signal && target_stopped_by_hw_breakpoint ()) | |
6033 | { | |
6034 | /* A delayed hardware breakpoint event. Ignore the trap. */ | |
6035 | if (debug_infrun) | |
6036 | fprintf_unfiltered (gdb_stdlog, | |
6037 | "infrun: delayed hardware breakpoint/watchpoint " | |
6038 | "trap, ignoring\n"); | |
6039 | random_signal = 0; | |
6040 | } | |
6041 | ||
bac7d97b PA |
6042 | /* If not, perhaps stepping/nexting can. */ |
6043 | if (random_signal) | |
6044 | random_signal = !(ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP | |
6045 | && currently_stepping (ecs->event_thread)); | |
ab04a2af | 6046 | |
2adfaa28 PA |
6047 | /* Perhaps the thread hit a single-step breakpoint of _another_ |
6048 | thread. Single-step breakpoints are transparent to the | |
6049 | breakpoints module. */ | |
6050 | if (random_signal) | |
6051 | random_signal = !ecs->hit_singlestep_breakpoint; | |
6052 | ||
bac7d97b PA |
6053 | /* No? Perhaps we got a moribund watchpoint. */ |
6054 | if (random_signal) | |
6055 | random_signal = !stopped_by_watchpoint; | |
ab04a2af | 6056 | |
c65d6b55 PA |
6057 | /* Always stop if the user explicitly requested this thread to |
6058 | remain stopped. */ | |
6059 | if (ecs->event_thread->stop_requested) | |
6060 | { | |
6061 | random_signal = 1; | |
6062 | if (debug_infrun) | |
6063 | fprintf_unfiltered (gdb_stdlog, "infrun: user-requested stop\n"); | |
6064 | } | |
6065 | ||
488f131b JB |
6066 | /* For the program's own signals, act according to |
6067 | the signal handling tables. */ | |
6068 | ||
ce12b012 | 6069 | if (random_signal) |
488f131b JB |
6070 | { |
6071 | /* Signal not for debugging purposes. */ | |
c9657e70 | 6072 | struct inferior *inf = find_inferior_ptid (ecs->ptid); |
c9737c08 | 6073 | enum gdb_signal stop_signal = ecs->event_thread->suspend.stop_signal; |
488f131b | 6074 | |
527159b7 | 6075 | if (debug_infrun) |
c9737c08 PA |
6076 | fprintf_unfiltered (gdb_stdlog, "infrun: random signal (%s)\n", |
6077 | gdb_signal_to_symbol_string (stop_signal)); | |
527159b7 | 6078 | |
488f131b JB |
6079 | stopped_by_random_signal = 1; |
6080 | ||
252fbfc8 PA |
6081 | /* Always stop on signals if we're either just gaining control |
6082 | of the program, or the user explicitly requested this thread | |
6083 | to remain stopped. */ | |
d6b48e9c | 6084 | if (stop_soon != NO_STOP_QUIETLY |
252fbfc8 | 6085 | || ecs->event_thread->stop_requested |
24291992 | 6086 | || (!inf->detaching |
16c381f0 | 6087 | && signal_stop_state (ecs->event_thread->suspend.stop_signal))) |
488f131b | 6088 | { |
22bcd14b | 6089 | stop_waiting (ecs); |
488f131b JB |
6090 | return; |
6091 | } | |
b57bacec PA |
6092 | |
6093 | /* Notify observers the signal has "handle print" set. Note we | |
6094 | returned early above if stopping; normal_stop handles the | |
6095 | printing in that case. */ | |
6096 | if (signal_print[ecs->event_thread->suspend.stop_signal]) | |
6097 | { | |
6098 | /* The signal table tells us to print about this signal. */ | |
223ffa71 | 6099 | target_terminal::ours_for_output (); |
b57bacec | 6100 | observer_notify_signal_received (ecs->event_thread->suspend.stop_signal); |
223ffa71 | 6101 | target_terminal::inferior (); |
b57bacec | 6102 | } |
488f131b JB |
6103 | |
6104 | /* Clear the signal if it should not be passed. */ | |
16c381f0 | 6105 | if (signal_program[ecs->event_thread->suspend.stop_signal] == 0) |
a493e3e2 | 6106 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; |
488f131b | 6107 | |
fb14de7b | 6108 | if (ecs->event_thread->prev_pc == stop_pc |
16c381f0 | 6109 | && ecs->event_thread->control.trap_expected |
8358c15c | 6110 | && ecs->event_thread->control.step_resume_breakpoint == NULL) |
68f53502 AC |
6111 | { |
6112 | /* We were just starting a new sequence, attempting to | |
6113 | single-step off of a breakpoint and expecting a SIGTRAP. | |
237fc4c9 | 6114 | Instead this signal arrives. This signal will take us out |
68f53502 AC |
6115 | of the stepping range so GDB needs to remember to, when |
6116 | the signal handler returns, resume stepping off that | |
6117 | breakpoint. */ | |
6118 | /* To simplify things, "continue" is forced to use the same | |
6119 | code paths as single-step - set a breakpoint at the | |
6120 | signal return address and then, once hit, step off that | |
6121 | breakpoint. */ | |
237fc4c9 PA |
6122 | if (debug_infrun) |
6123 | fprintf_unfiltered (gdb_stdlog, | |
6124 | "infrun: signal arrived while stepping over " | |
6125 | "breakpoint\n"); | |
d3169d93 | 6126 | |
2c03e5be | 6127 | insert_hp_step_resume_breakpoint_at_frame (frame); |
4e1c45ea | 6128 | ecs->event_thread->step_after_step_resume_breakpoint = 1; |
2455069d UW |
6129 | /* Reset trap_expected to ensure breakpoints are re-inserted. */ |
6130 | ecs->event_thread->control.trap_expected = 0; | |
d137e6dc PA |
6131 | |
6132 | /* If we were nexting/stepping some other thread, switch to | |
6133 | it, so that we don't continue it, losing control. */ | |
6134 | if (!switch_back_to_stepped_thread (ecs)) | |
6135 | keep_going (ecs); | |
9d799f85 | 6136 | return; |
68f53502 | 6137 | } |
9d799f85 | 6138 | |
e5f8a7cc PA |
6139 | if (ecs->event_thread->suspend.stop_signal != GDB_SIGNAL_0 |
6140 | && (pc_in_thread_step_range (stop_pc, ecs->event_thread) | |
6141 | || ecs->event_thread->control.step_range_end == 1) | |
edb3359d | 6142 | && frame_id_eq (get_stack_frame_id (frame), |
16c381f0 | 6143 | ecs->event_thread->control.step_stack_frame_id) |
8358c15c | 6144 | && ecs->event_thread->control.step_resume_breakpoint == NULL) |
d303a6c7 AC |
6145 | { |
6146 | /* The inferior is about to take a signal that will take it | |
6147 | out of the single step range. Set a breakpoint at the | |
6148 | current PC (which is presumably where the signal handler | |
6149 | will eventually return) and then allow the inferior to | |
6150 | run free. | |
6151 | ||
6152 | Note that this is only needed for a signal delivered | |
6153 | while in the single-step range. Nested signals aren't a | |
6154 | problem as they eventually all return. */ | |
237fc4c9 PA |
6155 | if (debug_infrun) |
6156 | fprintf_unfiltered (gdb_stdlog, | |
6157 | "infrun: signal may take us out of " | |
6158 | "single-step range\n"); | |
6159 | ||
372316f1 | 6160 | clear_step_over_info (); |
2c03e5be | 6161 | insert_hp_step_resume_breakpoint_at_frame (frame); |
e5f8a7cc | 6162 | ecs->event_thread->step_after_step_resume_breakpoint = 1; |
2455069d UW |
6163 | /* Reset trap_expected to ensure breakpoints are re-inserted. */ |
6164 | ecs->event_thread->control.trap_expected = 0; | |
9d799f85 AC |
6165 | keep_going (ecs); |
6166 | return; | |
d303a6c7 | 6167 | } |
9d799f85 AC |
6168 | |
6169 | /* Note: step_resume_breakpoint may be non-NULL. This occures | |
6170 | when either there's a nested signal, or when there's a | |
6171 | pending signal enabled just as the signal handler returns | |
6172 | (leaving the inferior at the step-resume-breakpoint without | |
6173 | actually executing it). Either way continue until the | |
6174 | breakpoint is really hit. */ | |
c447ac0b PA |
6175 | |
6176 | if (!switch_back_to_stepped_thread (ecs)) | |
6177 | { | |
6178 | if (debug_infrun) | |
6179 | fprintf_unfiltered (gdb_stdlog, | |
6180 | "infrun: random signal, keep going\n"); | |
6181 | ||
6182 | keep_going (ecs); | |
6183 | } | |
6184 | return; | |
488f131b | 6185 | } |
94c57d6a PA |
6186 | |
6187 | process_event_stop_test (ecs); | |
6188 | } | |
6189 | ||
6190 | /* Come here when we've got some debug event / signal we can explain | |
6191 | (IOW, not a random signal), and test whether it should cause a | |
6192 | stop, or whether we should resume the inferior (transparently). | |
6193 | E.g., could be a breakpoint whose condition evaluates false; we | |
6194 | could be still stepping within the line; etc. */ | |
6195 | ||
6196 | static void | |
6197 | process_event_stop_test (struct execution_control_state *ecs) | |
6198 | { | |
6199 | struct symtab_and_line stop_pc_sal; | |
6200 | struct frame_info *frame; | |
6201 | struct gdbarch *gdbarch; | |
cdaa5b73 PA |
6202 | CORE_ADDR jmp_buf_pc; |
6203 | struct bpstat_what what; | |
94c57d6a | 6204 | |
cdaa5b73 | 6205 | /* Handle cases caused by hitting a breakpoint. */ |
611c83ae | 6206 | |
cdaa5b73 PA |
6207 | frame = get_current_frame (); |
6208 | gdbarch = get_frame_arch (frame); | |
fcf3daef | 6209 | |
cdaa5b73 | 6210 | what = bpstat_what (ecs->event_thread->control.stop_bpstat); |
611c83ae | 6211 | |
cdaa5b73 PA |
6212 | if (what.call_dummy) |
6213 | { | |
6214 | stop_stack_dummy = what.call_dummy; | |
6215 | } | |
186c406b | 6216 | |
243a9253 PA |
6217 | /* A few breakpoint types have callbacks associated (e.g., |
6218 | bp_jit_event). Run them now. */ | |
6219 | bpstat_run_callbacks (ecs->event_thread->control.stop_bpstat); | |
6220 | ||
cdaa5b73 PA |
6221 | /* If we hit an internal event that triggers symbol changes, the |
6222 | current frame will be invalidated within bpstat_what (e.g., if we | |
6223 | hit an internal solib event). Re-fetch it. */ | |
6224 | frame = get_current_frame (); | |
6225 | gdbarch = get_frame_arch (frame); | |
e2e4d78b | 6226 | |
cdaa5b73 PA |
6227 | switch (what.main_action) |
6228 | { | |
6229 | case BPSTAT_WHAT_SET_LONGJMP_RESUME: | |
6230 | /* If we hit the breakpoint at longjmp while stepping, we | |
6231 | install a momentary breakpoint at the target of the | |
6232 | jmp_buf. */ | |
186c406b | 6233 | |
cdaa5b73 PA |
6234 | if (debug_infrun) |
6235 | fprintf_unfiltered (gdb_stdlog, | |
6236 | "infrun: BPSTAT_WHAT_SET_LONGJMP_RESUME\n"); | |
186c406b | 6237 | |
cdaa5b73 | 6238 | ecs->event_thread->stepping_over_breakpoint = 1; |
611c83ae | 6239 | |
cdaa5b73 PA |
6240 | if (what.is_longjmp) |
6241 | { | |
6242 | struct value *arg_value; | |
6243 | ||
6244 | /* If we set the longjmp breakpoint via a SystemTap probe, | |
6245 | then use it to extract the arguments. The destination PC | |
6246 | is the third argument to the probe. */ | |
6247 | arg_value = probe_safe_evaluate_at_pc (frame, 2); | |
6248 | if (arg_value) | |
8fa0c4f8 AA |
6249 | { |
6250 | jmp_buf_pc = value_as_address (arg_value); | |
6251 | jmp_buf_pc = gdbarch_addr_bits_remove (gdbarch, jmp_buf_pc); | |
6252 | } | |
cdaa5b73 PA |
6253 | else if (!gdbarch_get_longjmp_target_p (gdbarch) |
6254 | || !gdbarch_get_longjmp_target (gdbarch, | |
6255 | frame, &jmp_buf_pc)) | |
e2e4d78b | 6256 | { |
cdaa5b73 PA |
6257 | if (debug_infrun) |
6258 | fprintf_unfiltered (gdb_stdlog, | |
6259 | "infrun: BPSTAT_WHAT_SET_LONGJMP_RESUME " | |
6260 | "(!gdbarch_get_longjmp_target)\n"); | |
6261 | keep_going (ecs); | |
6262 | return; | |
e2e4d78b | 6263 | } |
e2e4d78b | 6264 | |
cdaa5b73 PA |
6265 | /* Insert a breakpoint at resume address. */ |
6266 | insert_longjmp_resume_breakpoint (gdbarch, jmp_buf_pc); | |
6267 | } | |
6268 | else | |
6269 | check_exception_resume (ecs, frame); | |
6270 | keep_going (ecs); | |
6271 | return; | |
e81a37f7 | 6272 | |
cdaa5b73 PA |
6273 | case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME: |
6274 | { | |
6275 | struct frame_info *init_frame; | |
e81a37f7 | 6276 | |
cdaa5b73 | 6277 | /* There are several cases to consider. |
c906108c | 6278 | |
cdaa5b73 PA |
6279 | 1. The initiating frame no longer exists. In this case we |
6280 | must stop, because the exception or longjmp has gone too | |
6281 | far. | |
2c03e5be | 6282 | |
cdaa5b73 PA |
6283 | 2. The initiating frame exists, and is the same as the |
6284 | current frame. We stop, because the exception or longjmp | |
6285 | has been caught. | |
2c03e5be | 6286 | |
cdaa5b73 PA |
6287 | 3. The initiating frame exists and is different from the |
6288 | current frame. This means the exception or longjmp has | |
6289 | been caught beneath the initiating frame, so keep going. | |
c906108c | 6290 | |
cdaa5b73 PA |
6291 | 4. longjmp breakpoint has been placed just to protect |
6292 | against stale dummy frames and user is not interested in | |
6293 | stopping around longjmps. */ | |
c5aa993b | 6294 | |
cdaa5b73 PA |
6295 | if (debug_infrun) |
6296 | fprintf_unfiltered (gdb_stdlog, | |
6297 | "infrun: BPSTAT_WHAT_CLEAR_LONGJMP_RESUME\n"); | |
c5aa993b | 6298 | |
cdaa5b73 PA |
6299 | gdb_assert (ecs->event_thread->control.exception_resume_breakpoint |
6300 | != NULL); | |
6301 | delete_exception_resume_breakpoint (ecs->event_thread); | |
c5aa993b | 6302 | |
cdaa5b73 PA |
6303 | if (what.is_longjmp) |
6304 | { | |
b67a2c6f | 6305 | check_longjmp_breakpoint_for_call_dummy (ecs->event_thread); |
c5aa993b | 6306 | |
cdaa5b73 | 6307 | if (!frame_id_p (ecs->event_thread->initiating_frame)) |
e5ef252a | 6308 | { |
cdaa5b73 PA |
6309 | /* Case 4. */ |
6310 | keep_going (ecs); | |
6311 | return; | |
e5ef252a | 6312 | } |
cdaa5b73 | 6313 | } |
c5aa993b | 6314 | |
cdaa5b73 | 6315 | init_frame = frame_find_by_id (ecs->event_thread->initiating_frame); |
527159b7 | 6316 | |
cdaa5b73 PA |
6317 | if (init_frame) |
6318 | { | |
6319 | struct frame_id current_id | |
6320 | = get_frame_id (get_current_frame ()); | |
6321 | if (frame_id_eq (current_id, | |
6322 | ecs->event_thread->initiating_frame)) | |
6323 | { | |
6324 | /* Case 2. Fall through. */ | |
6325 | } | |
6326 | else | |
6327 | { | |
6328 | /* Case 3. */ | |
6329 | keep_going (ecs); | |
6330 | return; | |
6331 | } | |
68f53502 | 6332 | } |
488f131b | 6333 | |
cdaa5b73 PA |
6334 | /* For Cases 1 and 2, remove the step-resume breakpoint, if it |
6335 | exists. */ | |
6336 | delete_step_resume_breakpoint (ecs->event_thread); | |
e5ef252a | 6337 | |
bdc36728 | 6338 | end_stepping_range (ecs); |
cdaa5b73 PA |
6339 | } |
6340 | return; | |
e5ef252a | 6341 | |
cdaa5b73 PA |
6342 | case BPSTAT_WHAT_SINGLE: |
6343 | if (debug_infrun) | |
6344 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_SINGLE\n"); | |
6345 | ecs->event_thread->stepping_over_breakpoint = 1; | |
6346 | /* Still need to check other stuff, at least the case where we | |
6347 | are stepping and step out of the right range. */ | |
6348 | break; | |
e5ef252a | 6349 | |
cdaa5b73 PA |
6350 | case BPSTAT_WHAT_STEP_RESUME: |
6351 | if (debug_infrun) | |
6352 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_STEP_RESUME\n"); | |
e5ef252a | 6353 | |
cdaa5b73 PA |
6354 | delete_step_resume_breakpoint (ecs->event_thread); |
6355 | if (ecs->event_thread->control.proceed_to_finish | |
6356 | && execution_direction == EXEC_REVERSE) | |
6357 | { | |
6358 | struct thread_info *tp = ecs->event_thread; | |
6359 | ||
6360 | /* We are finishing a function in reverse, and just hit the | |
6361 | step-resume breakpoint at the start address of the | |
6362 | function, and we're almost there -- just need to back up | |
6363 | by one more single-step, which should take us back to the | |
6364 | function call. */ | |
6365 | tp->control.step_range_start = tp->control.step_range_end = 1; | |
6366 | keep_going (ecs); | |
e5ef252a | 6367 | return; |
cdaa5b73 PA |
6368 | } |
6369 | fill_in_stop_func (gdbarch, ecs); | |
6370 | if (stop_pc == ecs->stop_func_start | |
6371 | && execution_direction == EXEC_REVERSE) | |
6372 | { | |
6373 | /* We are stepping over a function call in reverse, and just | |
6374 | hit the step-resume breakpoint at the start address of | |
6375 | the function. Go back to single-stepping, which should | |
6376 | take us back to the function call. */ | |
6377 | ecs->event_thread->stepping_over_breakpoint = 1; | |
6378 | keep_going (ecs); | |
6379 | return; | |
6380 | } | |
6381 | break; | |
e5ef252a | 6382 | |
cdaa5b73 PA |
6383 | case BPSTAT_WHAT_STOP_NOISY: |
6384 | if (debug_infrun) | |
6385 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_STOP_NOISY\n"); | |
6386 | stop_print_frame = 1; | |
e5ef252a | 6387 | |
99619bea PA |
6388 | /* Assume the thread stopped for a breapoint. We'll still check |
6389 | whether a/the breakpoint is there when the thread is next | |
6390 | resumed. */ | |
6391 | ecs->event_thread->stepping_over_breakpoint = 1; | |
e5ef252a | 6392 | |
22bcd14b | 6393 | stop_waiting (ecs); |
cdaa5b73 | 6394 | return; |
e5ef252a | 6395 | |
cdaa5b73 PA |
6396 | case BPSTAT_WHAT_STOP_SILENT: |
6397 | if (debug_infrun) | |
6398 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_STOP_SILENT\n"); | |
6399 | stop_print_frame = 0; | |
e5ef252a | 6400 | |
99619bea PA |
6401 | /* Assume the thread stopped for a breapoint. We'll still check |
6402 | whether a/the breakpoint is there when the thread is next | |
6403 | resumed. */ | |
6404 | ecs->event_thread->stepping_over_breakpoint = 1; | |
22bcd14b | 6405 | stop_waiting (ecs); |
cdaa5b73 PA |
6406 | return; |
6407 | ||
6408 | case BPSTAT_WHAT_HP_STEP_RESUME: | |
6409 | if (debug_infrun) | |
6410 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_HP_STEP_RESUME\n"); | |
6411 | ||
6412 | delete_step_resume_breakpoint (ecs->event_thread); | |
6413 | if (ecs->event_thread->step_after_step_resume_breakpoint) | |
6414 | { | |
6415 | /* Back when the step-resume breakpoint was inserted, we | |
6416 | were trying to single-step off a breakpoint. Go back to | |
6417 | doing that. */ | |
6418 | ecs->event_thread->step_after_step_resume_breakpoint = 0; | |
6419 | ecs->event_thread->stepping_over_breakpoint = 1; | |
6420 | keep_going (ecs); | |
6421 | return; | |
e5ef252a | 6422 | } |
cdaa5b73 PA |
6423 | break; |
6424 | ||
6425 | case BPSTAT_WHAT_KEEP_CHECKING: | |
6426 | break; | |
e5ef252a | 6427 | } |
c906108c | 6428 | |
af48d08f PA |
6429 | /* If we stepped a permanent breakpoint and we had a high priority |
6430 | step-resume breakpoint for the address we stepped, but we didn't | |
6431 | hit it, then we must have stepped into the signal handler. The | |
6432 | step-resume was only necessary to catch the case of _not_ | |
6433 | stepping into the handler, so delete it, and fall through to | |
6434 | checking whether the step finished. */ | |
6435 | if (ecs->event_thread->stepped_breakpoint) | |
6436 | { | |
6437 | struct breakpoint *sr_bp | |
6438 | = ecs->event_thread->control.step_resume_breakpoint; | |
6439 | ||
8d707a12 PA |
6440 | if (sr_bp != NULL |
6441 | && sr_bp->loc->permanent | |
af48d08f PA |
6442 | && sr_bp->type == bp_hp_step_resume |
6443 | && sr_bp->loc->address == ecs->event_thread->prev_pc) | |
6444 | { | |
6445 | if (debug_infrun) | |
6446 | fprintf_unfiltered (gdb_stdlog, | |
6447 | "infrun: stepped permanent breakpoint, stopped in " | |
6448 | "handler\n"); | |
6449 | delete_step_resume_breakpoint (ecs->event_thread); | |
6450 | ecs->event_thread->step_after_step_resume_breakpoint = 0; | |
6451 | } | |
6452 | } | |
6453 | ||
cdaa5b73 PA |
6454 | /* We come here if we hit a breakpoint but should not stop for it. |
6455 | Possibly we also were stepping and should stop for that. So fall | |
6456 | through and test for stepping. But, if not stepping, do not | |
6457 | stop. */ | |
c906108c | 6458 | |
a7212384 UW |
6459 | /* In all-stop mode, if we're currently stepping but have stopped in |
6460 | some other thread, we need to switch back to the stepped thread. */ | |
c447ac0b PA |
6461 | if (switch_back_to_stepped_thread (ecs)) |
6462 | return; | |
776f04fa | 6463 | |
8358c15c | 6464 | if (ecs->event_thread->control.step_resume_breakpoint) |
488f131b | 6465 | { |
527159b7 | 6466 | if (debug_infrun) |
d3169d93 DJ |
6467 | fprintf_unfiltered (gdb_stdlog, |
6468 | "infrun: step-resume breakpoint is inserted\n"); | |
527159b7 | 6469 | |
488f131b JB |
6470 | /* Having a step-resume breakpoint overrides anything |
6471 | else having to do with stepping commands until | |
6472 | that breakpoint is reached. */ | |
488f131b JB |
6473 | keep_going (ecs); |
6474 | return; | |
6475 | } | |
c5aa993b | 6476 | |
16c381f0 | 6477 | if (ecs->event_thread->control.step_range_end == 0) |
488f131b | 6478 | { |
527159b7 | 6479 | if (debug_infrun) |
8a9de0e4 | 6480 | fprintf_unfiltered (gdb_stdlog, "infrun: no stepping, continue\n"); |
488f131b | 6481 | /* Likewise if we aren't even stepping. */ |
488f131b JB |
6482 | keep_going (ecs); |
6483 | return; | |
6484 | } | |
c5aa993b | 6485 | |
4b7703ad JB |
6486 | /* Re-fetch current thread's frame in case the code above caused |
6487 | the frame cache to be re-initialized, making our FRAME variable | |
6488 | a dangling pointer. */ | |
6489 | frame = get_current_frame (); | |
628fe4e4 | 6490 | gdbarch = get_frame_arch (frame); |
7e324e48 | 6491 | fill_in_stop_func (gdbarch, ecs); |
4b7703ad | 6492 | |
488f131b | 6493 | /* If stepping through a line, keep going if still within it. |
c906108c | 6494 | |
488f131b JB |
6495 | Note that step_range_end is the address of the first instruction |
6496 | beyond the step range, and NOT the address of the last instruction | |
31410e84 MS |
6497 | within it! |
6498 | ||
6499 | Note also that during reverse execution, we may be stepping | |
6500 | through a function epilogue and therefore must detect when | |
6501 | the current-frame changes in the middle of a line. */ | |
6502 | ||
ce4c476a | 6503 | if (pc_in_thread_step_range (stop_pc, ecs->event_thread) |
31410e84 | 6504 | && (execution_direction != EXEC_REVERSE |
388a8562 | 6505 | || frame_id_eq (get_frame_id (frame), |
16c381f0 | 6506 | ecs->event_thread->control.step_frame_id))) |
488f131b | 6507 | { |
527159b7 | 6508 | if (debug_infrun) |
5af949e3 UW |
6509 | fprintf_unfiltered |
6510 | (gdb_stdlog, "infrun: stepping inside range [%s-%s]\n", | |
16c381f0 JK |
6511 | paddress (gdbarch, ecs->event_thread->control.step_range_start), |
6512 | paddress (gdbarch, ecs->event_thread->control.step_range_end)); | |
b2175913 | 6513 | |
c1e36e3e PA |
6514 | /* Tentatively re-enable range stepping; `resume' disables it if |
6515 | necessary (e.g., if we're stepping over a breakpoint or we | |
6516 | have software watchpoints). */ | |
6517 | ecs->event_thread->control.may_range_step = 1; | |
6518 | ||
b2175913 MS |
6519 | /* When stepping backward, stop at beginning of line range |
6520 | (unless it's the function entry point, in which case | |
6521 | keep going back to the call point). */ | |
16c381f0 | 6522 | if (stop_pc == ecs->event_thread->control.step_range_start |
b2175913 MS |
6523 | && stop_pc != ecs->stop_func_start |
6524 | && execution_direction == EXEC_REVERSE) | |
bdc36728 | 6525 | end_stepping_range (ecs); |
b2175913 MS |
6526 | else |
6527 | keep_going (ecs); | |
6528 | ||
488f131b JB |
6529 | return; |
6530 | } | |
c5aa993b | 6531 | |
488f131b | 6532 | /* We stepped out of the stepping range. */ |
c906108c | 6533 | |
488f131b | 6534 | /* If we are stepping at the source level and entered the runtime |
388a8562 MS |
6535 | loader dynamic symbol resolution code... |
6536 | ||
6537 | EXEC_FORWARD: we keep on single stepping until we exit the run | |
6538 | time loader code and reach the callee's address. | |
6539 | ||
6540 | EXEC_REVERSE: we've already executed the callee (backward), and | |
6541 | the runtime loader code is handled just like any other | |
6542 | undebuggable function call. Now we need only keep stepping | |
6543 | backward through the trampoline code, and that's handled further | |
6544 | down, so there is nothing for us to do here. */ | |
6545 | ||
6546 | if (execution_direction != EXEC_REVERSE | |
16c381f0 | 6547 | && ecs->event_thread->control.step_over_calls == STEP_OVER_UNDEBUGGABLE |
cfd8ab24 | 6548 | && in_solib_dynsym_resolve_code (stop_pc)) |
488f131b | 6549 | { |
4c8c40e6 | 6550 | CORE_ADDR pc_after_resolver = |
568d6575 | 6551 | gdbarch_skip_solib_resolver (gdbarch, stop_pc); |
c906108c | 6552 | |
527159b7 | 6553 | if (debug_infrun) |
3e43a32a MS |
6554 | fprintf_unfiltered (gdb_stdlog, |
6555 | "infrun: stepped into dynsym resolve code\n"); | |
527159b7 | 6556 | |
488f131b JB |
6557 | if (pc_after_resolver) |
6558 | { | |
6559 | /* Set up a step-resume breakpoint at the address | |
6560 | indicated by SKIP_SOLIB_RESOLVER. */ | |
51abb421 | 6561 | symtab_and_line sr_sal; |
488f131b | 6562 | sr_sal.pc = pc_after_resolver; |
6c95b8df | 6563 | sr_sal.pspace = get_frame_program_space (frame); |
488f131b | 6564 | |
a6d9a66e UW |
6565 | insert_step_resume_breakpoint_at_sal (gdbarch, |
6566 | sr_sal, null_frame_id); | |
c5aa993b | 6567 | } |
c906108c | 6568 | |
488f131b JB |
6569 | keep_going (ecs); |
6570 | return; | |
6571 | } | |
c906108c | 6572 | |
16c381f0 JK |
6573 | if (ecs->event_thread->control.step_range_end != 1 |
6574 | && (ecs->event_thread->control.step_over_calls == STEP_OVER_UNDEBUGGABLE | |
6575 | || ecs->event_thread->control.step_over_calls == STEP_OVER_ALL) | |
568d6575 | 6576 | && get_frame_type (frame) == SIGTRAMP_FRAME) |
488f131b | 6577 | { |
527159b7 | 6578 | if (debug_infrun) |
3e43a32a MS |
6579 | fprintf_unfiltered (gdb_stdlog, |
6580 | "infrun: stepped into signal trampoline\n"); | |
42edda50 | 6581 | /* The inferior, while doing a "step" or "next", has ended up in |
8fb3e588 AC |
6582 | a signal trampoline (either by a signal being delivered or by |
6583 | the signal handler returning). Just single-step until the | |
6584 | inferior leaves the trampoline (either by calling the handler | |
6585 | or returning). */ | |
488f131b JB |
6586 | keep_going (ecs); |
6587 | return; | |
6588 | } | |
c906108c | 6589 | |
14132e89 MR |
6590 | /* If we're in the return path from a shared library trampoline, |
6591 | we want to proceed through the trampoline when stepping. */ | |
6592 | /* macro/2012-04-25: This needs to come before the subroutine | |
6593 | call check below as on some targets return trampolines look | |
6594 | like subroutine calls (MIPS16 return thunks). */ | |
6595 | if (gdbarch_in_solib_return_trampoline (gdbarch, | |
6596 | stop_pc, ecs->stop_func_name) | |
6597 | && ecs->event_thread->control.step_over_calls != STEP_OVER_NONE) | |
6598 | { | |
6599 | /* Determine where this trampoline returns. */ | |
6600 | CORE_ADDR real_stop_pc; | |
6601 | ||
6602 | real_stop_pc = gdbarch_skip_trampoline_code (gdbarch, frame, stop_pc); | |
6603 | ||
6604 | if (debug_infrun) | |
6605 | fprintf_unfiltered (gdb_stdlog, | |
6606 | "infrun: stepped into solib return tramp\n"); | |
6607 | ||
6608 | /* Only proceed through if we know where it's going. */ | |
6609 | if (real_stop_pc) | |
6610 | { | |
6611 | /* And put the step-breakpoint there and go until there. */ | |
51abb421 | 6612 | symtab_and_line sr_sal; |
14132e89 MR |
6613 | sr_sal.pc = real_stop_pc; |
6614 | sr_sal.section = find_pc_overlay (sr_sal.pc); | |
6615 | sr_sal.pspace = get_frame_program_space (frame); | |
6616 | ||
6617 | /* Do not specify what the fp should be when we stop since | |
6618 | on some machines the prologue is where the new fp value | |
6619 | is established. */ | |
6620 | insert_step_resume_breakpoint_at_sal (gdbarch, | |
6621 | sr_sal, null_frame_id); | |
6622 | ||
6623 | /* Restart without fiddling with the step ranges or | |
6624 | other state. */ | |
6625 | keep_going (ecs); | |
6626 | return; | |
6627 | } | |
6628 | } | |
6629 | ||
c17eaafe DJ |
6630 | /* Check for subroutine calls. The check for the current frame |
6631 | equalling the step ID is not necessary - the check of the | |
6632 | previous frame's ID is sufficient - but it is a common case and | |
6633 | cheaper than checking the previous frame's ID. | |
14e60db5 DJ |
6634 | |
6635 | NOTE: frame_id_eq will never report two invalid frame IDs as | |
6636 | being equal, so to get into this block, both the current and | |
6637 | previous frame must have valid frame IDs. */ | |
005ca36a JB |
6638 | /* The outer_frame_id check is a heuristic to detect stepping |
6639 | through startup code. If we step over an instruction which | |
6640 | sets the stack pointer from an invalid value to a valid value, | |
6641 | we may detect that as a subroutine call from the mythical | |
6642 | "outermost" function. This could be fixed by marking | |
6643 | outermost frames as !stack_p,code_p,special_p. Then the | |
6644 | initial outermost frame, before sp was valid, would | |
ce6cca6d | 6645 | have code_addr == &_start. See the comment in frame_id_eq |
005ca36a | 6646 | for more. */ |
edb3359d | 6647 | if (!frame_id_eq (get_stack_frame_id (frame), |
16c381f0 | 6648 | ecs->event_thread->control.step_stack_frame_id) |
005ca36a | 6649 | && (frame_id_eq (frame_unwind_caller_id (get_current_frame ()), |
16c381f0 JK |
6650 | ecs->event_thread->control.step_stack_frame_id) |
6651 | && (!frame_id_eq (ecs->event_thread->control.step_stack_frame_id, | |
005ca36a | 6652 | outer_frame_id) |
885eeb5b PA |
6653 | || (ecs->event_thread->control.step_start_function |
6654 | != find_pc_function (stop_pc))))) | |
488f131b | 6655 | { |
95918acb | 6656 | CORE_ADDR real_stop_pc; |
8fb3e588 | 6657 | |
527159b7 | 6658 | if (debug_infrun) |
8a9de0e4 | 6659 | fprintf_unfiltered (gdb_stdlog, "infrun: stepped into subroutine\n"); |
527159b7 | 6660 | |
b7a084be | 6661 | if (ecs->event_thread->control.step_over_calls == STEP_OVER_NONE) |
95918acb AC |
6662 | { |
6663 | /* I presume that step_over_calls is only 0 when we're | |
6664 | supposed to be stepping at the assembly language level | |
6665 | ("stepi"). Just stop. */ | |
388a8562 | 6666 | /* And this works the same backward as frontward. MVS */ |
bdc36728 | 6667 | end_stepping_range (ecs); |
95918acb AC |
6668 | return; |
6669 | } | |
8fb3e588 | 6670 | |
388a8562 MS |
6671 | /* Reverse stepping through solib trampolines. */ |
6672 | ||
6673 | if (execution_direction == EXEC_REVERSE | |
16c381f0 | 6674 | && ecs->event_thread->control.step_over_calls != STEP_OVER_NONE |
388a8562 MS |
6675 | && (gdbarch_skip_trampoline_code (gdbarch, frame, stop_pc) |
6676 | || (ecs->stop_func_start == 0 | |
6677 | && in_solib_dynsym_resolve_code (stop_pc)))) | |
6678 | { | |
6679 | /* Any solib trampoline code can be handled in reverse | |
6680 | by simply continuing to single-step. We have already | |
6681 | executed the solib function (backwards), and a few | |
6682 | steps will take us back through the trampoline to the | |
6683 | caller. */ | |
6684 | keep_going (ecs); | |
6685 | return; | |
6686 | } | |
6687 | ||
16c381f0 | 6688 | if (ecs->event_thread->control.step_over_calls == STEP_OVER_ALL) |
8567c30f | 6689 | { |
b2175913 MS |
6690 | /* We're doing a "next". |
6691 | ||
6692 | Normal (forward) execution: set a breakpoint at the | |
6693 | callee's return address (the address at which the caller | |
6694 | will resume). | |
6695 | ||
6696 | Reverse (backward) execution. set the step-resume | |
6697 | breakpoint at the start of the function that we just | |
6698 | stepped into (backwards), and continue to there. When we | |
6130d0b7 | 6699 | get there, we'll need to single-step back to the caller. */ |
b2175913 MS |
6700 | |
6701 | if (execution_direction == EXEC_REVERSE) | |
6702 | { | |
acf9414f JK |
6703 | /* If we're already at the start of the function, we've either |
6704 | just stepped backward into a single instruction function, | |
6705 | or stepped back out of a signal handler to the first instruction | |
6706 | of the function. Just keep going, which will single-step back | |
6707 | to the caller. */ | |
58c48e72 | 6708 | if (ecs->stop_func_start != stop_pc && ecs->stop_func_start != 0) |
acf9414f | 6709 | { |
acf9414f | 6710 | /* Normal function call return (static or dynamic). */ |
51abb421 | 6711 | symtab_and_line sr_sal; |
acf9414f JK |
6712 | sr_sal.pc = ecs->stop_func_start; |
6713 | sr_sal.pspace = get_frame_program_space (frame); | |
6714 | insert_step_resume_breakpoint_at_sal (gdbarch, | |
6715 | sr_sal, null_frame_id); | |
6716 | } | |
b2175913 MS |
6717 | } |
6718 | else | |
568d6575 | 6719 | insert_step_resume_breakpoint_at_caller (frame); |
b2175913 | 6720 | |
8567c30f AC |
6721 | keep_going (ecs); |
6722 | return; | |
6723 | } | |
a53c66de | 6724 | |
95918acb | 6725 | /* If we are in a function call trampoline (a stub between the |
8fb3e588 AC |
6726 | calling routine and the real function), locate the real |
6727 | function. That's what tells us (a) whether we want to step | |
6728 | into it at all, and (b) what prologue we want to run to the | |
6729 | end of, if we do step into it. */ | |
568d6575 | 6730 | real_stop_pc = skip_language_trampoline (frame, stop_pc); |
95918acb | 6731 | if (real_stop_pc == 0) |
568d6575 | 6732 | real_stop_pc = gdbarch_skip_trampoline_code (gdbarch, frame, stop_pc); |
95918acb AC |
6733 | if (real_stop_pc != 0) |
6734 | ecs->stop_func_start = real_stop_pc; | |
8fb3e588 | 6735 | |
db5f024e | 6736 | if (real_stop_pc != 0 && in_solib_dynsym_resolve_code (real_stop_pc)) |
1b2bfbb9 | 6737 | { |
51abb421 | 6738 | symtab_and_line sr_sal; |
1b2bfbb9 | 6739 | sr_sal.pc = ecs->stop_func_start; |
6c95b8df | 6740 | sr_sal.pspace = get_frame_program_space (frame); |
1b2bfbb9 | 6741 | |
a6d9a66e UW |
6742 | insert_step_resume_breakpoint_at_sal (gdbarch, |
6743 | sr_sal, null_frame_id); | |
8fb3e588 AC |
6744 | keep_going (ecs); |
6745 | return; | |
1b2bfbb9 RC |
6746 | } |
6747 | ||
95918acb | 6748 | /* If we have line number information for the function we are |
1bfeeb0f JL |
6749 | thinking of stepping into and the function isn't on the skip |
6750 | list, step into it. | |
95918acb | 6751 | |
8fb3e588 AC |
6752 | If there are several symtabs at that PC (e.g. with include |
6753 | files), just want to know whether *any* of them have line | |
6754 | numbers. find_pc_line handles this. */ | |
95918acb AC |
6755 | { |
6756 | struct symtab_and_line tmp_sal; | |
8fb3e588 | 6757 | |
95918acb | 6758 | tmp_sal = find_pc_line (ecs->stop_func_start, 0); |
2b914b52 | 6759 | if (tmp_sal.line != 0 |
85817405 | 6760 | && !function_name_is_marked_for_skip (ecs->stop_func_name, |
de7985c3 | 6761 | tmp_sal)) |
95918acb | 6762 | { |
b2175913 | 6763 | if (execution_direction == EXEC_REVERSE) |
568d6575 | 6764 | handle_step_into_function_backward (gdbarch, ecs); |
b2175913 | 6765 | else |
568d6575 | 6766 | handle_step_into_function (gdbarch, ecs); |
95918acb AC |
6767 | return; |
6768 | } | |
6769 | } | |
6770 | ||
6771 | /* If we have no line number and the step-stop-if-no-debug is | |
8fb3e588 AC |
6772 | set, we stop the step so that the user has a chance to switch |
6773 | in assembly mode. */ | |
16c381f0 | 6774 | if (ecs->event_thread->control.step_over_calls == STEP_OVER_UNDEBUGGABLE |
078130d0 | 6775 | && step_stop_if_no_debug) |
95918acb | 6776 | { |
bdc36728 | 6777 | end_stepping_range (ecs); |
95918acb AC |
6778 | return; |
6779 | } | |
6780 | ||
b2175913 MS |
6781 | if (execution_direction == EXEC_REVERSE) |
6782 | { | |
acf9414f JK |
6783 | /* If we're already at the start of the function, we've either just |
6784 | stepped backward into a single instruction function without line | |
6785 | number info, or stepped back out of a signal handler to the first | |
6786 | instruction of the function without line number info. Just keep | |
6787 | going, which will single-step back to the caller. */ | |
6788 | if (ecs->stop_func_start != stop_pc) | |
6789 | { | |
6790 | /* Set a breakpoint at callee's start address. | |
6791 | From there we can step once and be back in the caller. */ | |
51abb421 | 6792 | symtab_and_line sr_sal; |
acf9414f JK |
6793 | sr_sal.pc = ecs->stop_func_start; |
6794 | sr_sal.pspace = get_frame_program_space (frame); | |
6795 | insert_step_resume_breakpoint_at_sal (gdbarch, | |
6796 | sr_sal, null_frame_id); | |
6797 | } | |
b2175913 MS |
6798 | } |
6799 | else | |
6800 | /* Set a breakpoint at callee's return address (the address | |
6801 | at which the caller will resume). */ | |
568d6575 | 6802 | insert_step_resume_breakpoint_at_caller (frame); |
b2175913 | 6803 | |
95918acb | 6804 | keep_going (ecs); |
488f131b | 6805 | return; |
488f131b | 6806 | } |
c906108c | 6807 | |
fdd654f3 MS |
6808 | /* Reverse stepping through solib trampolines. */ |
6809 | ||
6810 | if (execution_direction == EXEC_REVERSE | |
16c381f0 | 6811 | && ecs->event_thread->control.step_over_calls != STEP_OVER_NONE) |
fdd654f3 MS |
6812 | { |
6813 | if (gdbarch_skip_trampoline_code (gdbarch, frame, stop_pc) | |
6814 | || (ecs->stop_func_start == 0 | |
6815 | && in_solib_dynsym_resolve_code (stop_pc))) | |
6816 | { | |
6817 | /* Any solib trampoline code can be handled in reverse | |
6818 | by simply continuing to single-step. We have already | |
6819 | executed the solib function (backwards), and a few | |
6820 | steps will take us back through the trampoline to the | |
6821 | caller. */ | |
6822 | keep_going (ecs); | |
6823 | return; | |
6824 | } | |
6825 | else if (in_solib_dynsym_resolve_code (stop_pc)) | |
6826 | { | |
6827 | /* Stepped backward into the solib dynsym resolver. | |
6828 | Set a breakpoint at its start and continue, then | |
6829 | one more step will take us out. */ | |
51abb421 | 6830 | symtab_and_line sr_sal; |
fdd654f3 | 6831 | sr_sal.pc = ecs->stop_func_start; |
9d1807c3 | 6832 | sr_sal.pspace = get_frame_program_space (frame); |
fdd654f3 MS |
6833 | insert_step_resume_breakpoint_at_sal (gdbarch, |
6834 | sr_sal, null_frame_id); | |
6835 | keep_going (ecs); | |
6836 | return; | |
6837 | } | |
6838 | } | |
6839 | ||
2afb61aa | 6840 | stop_pc_sal = find_pc_line (stop_pc, 0); |
7ed0fe66 | 6841 | |
1b2bfbb9 RC |
6842 | /* NOTE: tausq/2004-05-24: This if block used to be done before all |
6843 | the trampoline processing logic, however, there are some trampolines | |
6844 | that have no names, so we should do trampoline handling first. */ | |
16c381f0 | 6845 | if (ecs->event_thread->control.step_over_calls == STEP_OVER_UNDEBUGGABLE |
7ed0fe66 | 6846 | && ecs->stop_func_name == NULL |
2afb61aa | 6847 | && stop_pc_sal.line == 0) |
1b2bfbb9 | 6848 | { |
527159b7 | 6849 | if (debug_infrun) |
3e43a32a MS |
6850 | fprintf_unfiltered (gdb_stdlog, |
6851 | "infrun: stepped into undebuggable function\n"); | |
527159b7 | 6852 | |
1b2bfbb9 | 6853 | /* The inferior just stepped into, or returned to, an |
7ed0fe66 DJ |
6854 | undebuggable function (where there is no debugging information |
6855 | and no line number corresponding to the address where the | |
1b2bfbb9 RC |
6856 | inferior stopped). Since we want to skip this kind of code, |
6857 | we keep going until the inferior returns from this | |
14e60db5 DJ |
6858 | function - unless the user has asked us not to (via |
6859 | set step-mode) or we no longer know how to get back | |
6860 | to the call site. */ | |
6861 | if (step_stop_if_no_debug | |
c7ce8faa | 6862 | || !frame_id_p (frame_unwind_caller_id (frame))) |
1b2bfbb9 RC |
6863 | { |
6864 | /* If we have no line number and the step-stop-if-no-debug | |
6865 | is set, we stop the step so that the user has a chance to | |
6866 | switch in assembly mode. */ | |
bdc36728 | 6867 | end_stepping_range (ecs); |
1b2bfbb9 RC |
6868 | return; |
6869 | } | |
6870 | else | |
6871 | { | |
6872 | /* Set a breakpoint at callee's return address (the address | |
6873 | at which the caller will resume). */ | |
568d6575 | 6874 | insert_step_resume_breakpoint_at_caller (frame); |
1b2bfbb9 RC |
6875 | keep_going (ecs); |
6876 | return; | |
6877 | } | |
6878 | } | |
6879 | ||
16c381f0 | 6880 | if (ecs->event_thread->control.step_range_end == 1) |
1b2bfbb9 RC |
6881 | { |
6882 | /* It is stepi or nexti. We always want to stop stepping after | |
6883 | one instruction. */ | |
527159b7 | 6884 | if (debug_infrun) |
8a9de0e4 | 6885 | fprintf_unfiltered (gdb_stdlog, "infrun: stepi/nexti\n"); |
bdc36728 | 6886 | end_stepping_range (ecs); |
1b2bfbb9 RC |
6887 | return; |
6888 | } | |
6889 | ||
2afb61aa | 6890 | if (stop_pc_sal.line == 0) |
488f131b JB |
6891 | { |
6892 | /* We have no line number information. That means to stop | |
6893 | stepping (does this always happen right after one instruction, | |
6894 | when we do "s" in a function with no line numbers, | |
6895 | or can this happen as a result of a return or longjmp?). */ | |
527159b7 | 6896 | if (debug_infrun) |
8a9de0e4 | 6897 | fprintf_unfiltered (gdb_stdlog, "infrun: no line number info\n"); |
bdc36728 | 6898 | end_stepping_range (ecs); |
488f131b JB |
6899 | return; |
6900 | } | |
c906108c | 6901 | |
edb3359d DJ |
6902 | /* Look for "calls" to inlined functions, part one. If the inline |
6903 | frame machinery detected some skipped call sites, we have entered | |
6904 | a new inline function. */ | |
6905 | ||
6906 | if (frame_id_eq (get_frame_id (get_current_frame ()), | |
16c381f0 | 6907 | ecs->event_thread->control.step_frame_id) |
edb3359d DJ |
6908 | && inline_skipped_frames (ecs->ptid)) |
6909 | { | |
edb3359d DJ |
6910 | if (debug_infrun) |
6911 | fprintf_unfiltered (gdb_stdlog, | |
6912 | "infrun: stepped into inlined function\n"); | |
6913 | ||
51abb421 | 6914 | symtab_and_line call_sal = find_frame_sal (get_current_frame ()); |
edb3359d | 6915 | |
16c381f0 | 6916 | if (ecs->event_thread->control.step_over_calls != STEP_OVER_ALL) |
edb3359d DJ |
6917 | { |
6918 | /* For "step", we're going to stop. But if the call site | |
6919 | for this inlined function is on the same source line as | |
6920 | we were previously stepping, go down into the function | |
6921 | first. Otherwise stop at the call site. */ | |
6922 | ||
6923 | if (call_sal.line == ecs->event_thread->current_line | |
6924 | && call_sal.symtab == ecs->event_thread->current_symtab) | |
6925 | step_into_inline_frame (ecs->ptid); | |
6926 | ||
bdc36728 | 6927 | end_stepping_range (ecs); |
edb3359d DJ |
6928 | return; |
6929 | } | |
6930 | else | |
6931 | { | |
6932 | /* For "next", we should stop at the call site if it is on a | |
6933 | different source line. Otherwise continue through the | |
6934 | inlined function. */ | |
6935 | if (call_sal.line == ecs->event_thread->current_line | |
6936 | && call_sal.symtab == ecs->event_thread->current_symtab) | |
6937 | keep_going (ecs); | |
6938 | else | |
bdc36728 | 6939 | end_stepping_range (ecs); |
edb3359d DJ |
6940 | return; |
6941 | } | |
6942 | } | |
6943 | ||
6944 | /* Look for "calls" to inlined functions, part two. If we are still | |
6945 | in the same real function we were stepping through, but we have | |
6946 | to go further up to find the exact frame ID, we are stepping | |
6947 | through a more inlined call beyond its call site. */ | |
6948 | ||
6949 | if (get_frame_type (get_current_frame ()) == INLINE_FRAME | |
6950 | && !frame_id_eq (get_frame_id (get_current_frame ()), | |
16c381f0 | 6951 | ecs->event_thread->control.step_frame_id) |
edb3359d | 6952 | && stepped_in_from (get_current_frame (), |
16c381f0 | 6953 | ecs->event_thread->control.step_frame_id)) |
edb3359d DJ |
6954 | { |
6955 | if (debug_infrun) | |
6956 | fprintf_unfiltered (gdb_stdlog, | |
6957 | "infrun: stepping through inlined function\n"); | |
6958 | ||
16c381f0 | 6959 | if (ecs->event_thread->control.step_over_calls == STEP_OVER_ALL) |
edb3359d DJ |
6960 | keep_going (ecs); |
6961 | else | |
bdc36728 | 6962 | end_stepping_range (ecs); |
edb3359d DJ |
6963 | return; |
6964 | } | |
6965 | ||
2afb61aa | 6966 | if ((stop_pc == stop_pc_sal.pc) |
4e1c45ea PA |
6967 | && (ecs->event_thread->current_line != stop_pc_sal.line |
6968 | || ecs->event_thread->current_symtab != stop_pc_sal.symtab)) | |
488f131b JB |
6969 | { |
6970 | /* We are at the start of a different line. So stop. Note that | |
6971 | we don't stop if we step into the middle of a different line. | |
6972 | That is said to make things like for (;;) statements work | |
6973 | better. */ | |
527159b7 | 6974 | if (debug_infrun) |
3e43a32a MS |
6975 | fprintf_unfiltered (gdb_stdlog, |
6976 | "infrun: stepped to a different line\n"); | |
bdc36728 | 6977 | end_stepping_range (ecs); |
488f131b JB |
6978 | return; |
6979 | } | |
c906108c | 6980 | |
488f131b | 6981 | /* We aren't done stepping. |
c906108c | 6982 | |
488f131b JB |
6983 | Optimize by setting the stepping range to the line. |
6984 | (We might not be in the original line, but if we entered a | |
6985 | new line in mid-statement, we continue stepping. This makes | |
6986 | things like for(;;) statements work better.) */ | |
c906108c | 6987 | |
16c381f0 JK |
6988 | ecs->event_thread->control.step_range_start = stop_pc_sal.pc; |
6989 | ecs->event_thread->control.step_range_end = stop_pc_sal.end; | |
c1e36e3e | 6990 | ecs->event_thread->control.may_range_step = 1; |
edb3359d | 6991 | set_step_info (frame, stop_pc_sal); |
488f131b | 6992 | |
527159b7 | 6993 | if (debug_infrun) |
8a9de0e4 | 6994 | fprintf_unfiltered (gdb_stdlog, "infrun: keep going\n"); |
488f131b | 6995 | keep_going (ecs); |
104c1213 JM |
6996 | } |
6997 | ||
c447ac0b PA |
6998 | /* In all-stop mode, if we're currently stepping but have stopped in |
6999 | some other thread, we may need to switch back to the stepped | |
7000 | thread. Returns true we set the inferior running, false if we left | |
7001 | it stopped (and the event needs further processing). */ | |
7002 | ||
7003 | static int | |
7004 | switch_back_to_stepped_thread (struct execution_control_state *ecs) | |
7005 | { | |
fbea99ea | 7006 | if (!target_is_non_stop_p ()) |
c447ac0b PA |
7007 | { |
7008 | struct thread_info *tp; | |
99619bea PA |
7009 | struct thread_info *stepping_thread; |
7010 | ||
7011 | /* If any thread is blocked on some internal breakpoint, and we | |
7012 | simply need to step over that breakpoint to get it going | |
7013 | again, do that first. */ | |
7014 | ||
7015 | /* However, if we see an event for the stepping thread, then we | |
7016 | know all other threads have been moved past their breakpoints | |
7017 | already. Let the caller check whether the step is finished, | |
7018 | etc., before deciding to move it past a breakpoint. */ | |
7019 | if (ecs->event_thread->control.step_range_end != 0) | |
7020 | return 0; | |
7021 | ||
7022 | /* Check if the current thread is blocked on an incomplete | |
7023 | step-over, interrupted by a random signal. */ | |
7024 | if (ecs->event_thread->control.trap_expected | |
7025 | && ecs->event_thread->suspend.stop_signal != GDB_SIGNAL_TRAP) | |
c447ac0b | 7026 | { |
99619bea PA |
7027 | if (debug_infrun) |
7028 | { | |
7029 | fprintf_unfiltered (gdb_stdlog, | |
7030 | "infrun: need to finish step-over of [%s]\n", | |
7031 | target_pid_to_str (ecs->event_thread->ptid)); | |
7032 | } | |
7033 | keep_going (ecs); | |
7034 | return 1; | |
7035 | } | |
2adfaa28 | 7036 | |
99619bea PA |
7037 | /* Check if the current thread is blocked by a single-step |
7038 | breakpoint of another thread. */ | |
7039 | if (ecs->hit_singlestep_breakpoint) | |
7040 | { | |
7041 | if (debug_infrun) | |
7042 | { | |
7043 | fprintf_unfiltered (gdb_stdlog, | |
7044 | "infrun: need to step [%s] over single-step " | |
7045 | "breakpoint\n", | |
7046 | target_pid_to_str (ecs->ptid)); | |
7047 | } | |
7048 | keep_going (ecs); | |
7049 | return 1; | |
7050 | } | |
7051 | ||
4d9d9d04 PA |
7052 | /* If this thread needs yet another step-over (e.g., stepping |
7053 | through a delay slot), do it first before moving on to | |
7054 | another thread. */ | |
7055 | if (thread_still_needs_step_over (ecs->event_thread)) | |
7056 | { | |
7057 | if (debug_infrun) | |
7058 | { | |
7059 | fprintf_unfiltered (gdb_stdlog, | |
7060 | "infrun: thread [%s] still needs step-over\n", | |
7061 | target_pid_to_str (ecs->event_thread->ptid)); | |
7062 | } | |
7063 | keep_going (ecs); | |
7064 | return 1; | |
7065 | } | |
70509625 | 7066 | |
483805cf PA |
7067 | /* If scheduler locking applies even if not stepping, there's no |
7068 | need to walk over threads. Above we've checked whether the | |
7069 | current thread is stepping. If some other thread not the | |
7070 | event thread is stepping, then it must be that scheduler | |
7071 | locking is not in effect. */ | |
856e7dd6 | 7072 | if (schedlock_applies (ecs->event_thread)) |
483805cf PA |
7073 | return 0; |
7074 | ||
4d9d9d04 PA |
7075 | /* Otherwise, we no longer expect a trap in the current thread. |
7076 | Clear the trap_expected flag before switching back -- this is | |
7077 | what keep_going does as well, if we call it. */ | |
7078 | ecs->event_thread->control.trap_expected = 0; | |
7079 | ||
7080 | /* Likewise, clear the signal if it should not be passed. */ | |
7081 | if (!signal_program[ecs->event_thread->suspend.stop_signal]) | |
7082 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; | |
7083 | ||
7084 | /* Do all pending step-overs before actually proceeding with | |
483805cf | 7085 | step/next/etc. */ |
4d9d9d04 PA |
7086 | if (start_step_over ()) |
7087 | { | |
7088 | prepare_to_wait (ecs); | |
7089 | return 1; | |
7090 | } | |
7091 | ||
7092 | /* Look for the stepping/nexting thread. */ | |
483805cf | 7093 | stepping_thread = NULL; |
4d9d9d04 | 7094 | |
034f788c | 7095 | ALL_NON_EXITED_THREADS (tp) |
483805cf | 7096 | { |
fbea99ea PA |
7097 | /* Ignore threads of processes the caller is not |
7098 | resuming. */ | |
483805cf | 7099 | if (!sched_multi |
1afd5965 | 7100 | && ptid_get_pid (tp->ptid) != ptid_get_pid (ecs->ptid)) |
483805cf PA |
7101 | continue; |
7102 | ||
7103 | /* When stepping over a breakpoint, we lock all threads | |
7104 | except the one that needs to move past the breakpoint. | |
7105 | If a non-event thread has this set, the "incomplete | |
7106 | step-over" check above should have caught it earlier. */ | |
372316f1 PA |
7107 | if (tp->control.trap_expected) |
7108 | { | |
7109 | internal_error (__FILE__, __LINE__, | |
7110 | "[%s] has inconsistent state: " | |
7111 | "trap_expected=%d\n", | |
7112 | target_pid_to_str (tp->ptid), | |
7113 | tp->control.trap_expected); | |
7114 | } | |
483805cf PA |
7115 | |
7116 | /* Did we find the stepping thread? */ | |
7117 | if (tp->control.step_range_end) | |
7118 | { | |
7119 | /* Yep. There should only one though. */ | |
7120 | gdb_assert (stepping_thread == NULL); | |
7121 | ||
7122 | /* The event thread is handled at the top, before we | |
7123 | enter this loop. */ | |
7124 | gdb_assert (tp != ecs->event_thread); | |
7125 | ||
7126 | /* If some thread other than the event thread is | |
7127 | stepping, then scheduler locking can't be in effect, | |
7128 | otherwise we wouldn't have resumed the current event | |
7129 | thread in the first place. */ | |
856e7dd6 | 7130 | gdb_assert (!schedlock_applies (tp)); |
483805cf PA |
7131 | |
7132 | stepping_thread = tp; | |
7133 | } | |
99619bea PA |
7134 | } |
7135 | ||
483805cf | 7136 | if (stepping_thread != NULL) |
99619bea | 7137 | { |
c447ac0b PA |
7138 | if (debug_infrun) |
7139 | fprintf_unfiltered (gdb_stdlog, | |
7140 | "infrun: switching back to stepped thread\n"); | |
7141 | ||
2ac7589c PA |
7142 | if (keep_going_stepped_thread (stepping_thread)) |
7143 | { | |
7144 | prepare_to_wait (ecs); | |
7145 | return 1; | |
7146 | } | |
7147 | } | |
7148 | } | |
2adfaa28 | 7149 | |
2ac7589c PA |
7150 | return 0; |
7151 | } | |
2adfaa28 | 7152 | |
2ac7589c PA |
7153 | /* Set a previously stepped thread back to stepping. Returns true on |
7154 | success, false if the resume is not possible (e.g., the thread | |
7155 | vanished). */ | |
7156 | ||
7157 | static int | |
7158 | keep_going_stepped_thread (struct thread_info *tp) | |
7159 | { | |
7160 | struct frame_info *frame; | |
2ac7589c PA |
7161 | struct execution_control_state ecss; |
7162 | struct execution_control_state *ecs = &ecss; | |
2adfaa28 | 7163 | |
2ac7589c PA |
7164 | /* If the stepping thread exited, then don't try to switch back and |
7165 | resume it, which could fail in several different ways depending | |
7166 | on the target. Instead, just keep going. | |
2adfaa28 | 7167 | |
2ac7589c PA |
7168 | We can find a stepping dead thread in the thread list in two |
7169 | cases: | |
2adfaa28 | 7170 | |
2ac7589c PA |
7171 | - The target supports thread exit events, and when the target |
7172 | tries to delete the thread from the thread list, inferior_ptid | |
7173 | pointed at the exiting thread. In such case, calling | |
7174 | delete_thread does not really remove the thread from the list; | |
7175 | instead, the thread is left listed, with 'exited' state. | |
64ce06e4 | 7176 | |
2ac7589c PA |
7177 | - The target's debug interface does not support thread exit |
7178 | events, and so we have no idea whatsoever if the previously | |
7179 | stepping thread is still alive. For that reason, we need to | |
7180 | synchronously query the target now. */ | |
2adfaa28 | 7181 | |
2ac7589c PA |
7182 | if (is_exited (tp->ptid) |
7183 | || !target_thread_alive (tp->ptid)) | |
7184 | { | |
7185 | if (debug_infrun) | |
7186 | fprintf_unfiltered (gdb_stdlog, | |
7187 | "infrun: not resuming previously " | |
7188 | "stepped thread, it has vanished\n"); | |
7189 | ||
7190 | delete_thread (tp->ptid); | |
7191 | return 0; | |
c447ac0b | 7192 | } |
2ac7589c PA |
7193 | |
7194 | if (debug_infrun) | |
7195 | fprintf_unfiltered (gdb_stdlog, | |
7196 | "infrun: resuming previously stepped thread\n"); | |
7197 | ||
7198 | reset_ecs (ecs, tp); | |
7199 | switch_to_thread (tp->ptid); | |
7200 | ||
7201 | stop_pc = regcache_read_pc (get_thread_regcache (tp->ptid)); | |
7202 | frame = get_current_frame (); | |
2ac7589c PA |
7203 | |
7204 | /* If the PC of the thread we were trying to single-step has | |
7205 | changed, then that thread has trapped or been signaled, but the | |
7206 | event has not been reported to GDB yet. Re-poll the target | |
7207 | looking for this particular thread's event (i.e. temporarily | |
7208 | enable schedlock) by: | |
7209 | ||
7210 | - setting a break at the current PC | |
7211 | - resuming that particular thread, only (by setting trap | |
7212 | expected) | |
7213 | ||
7214 | This prevents us continuously moving the single-step breakpoint | |
7215 | forward, one instruction at a time, overstepping. */ | |
7216 | ||
7217 | if (stop_pc != tp->prev_pc) | |
7218 | { | |
7219 | ptid_t resume_ptid; | |
7220 | ||
7221 | if (debug_infrun) | |
7222 | fprintf_unfiltered (gdb_stdlog, | |
7223 | "infrun: expected thread advanced also (%s -> %s)\n", | |
7224 | paddress (target_gdbarch (), tp->prev_pc), | |
7225 | paddress (target_gdbarch (), stop_pc)); | |
7226 | ||
7227 | /* Clear the info of the previous step-over, as it's no longer | |
7228 | valid (if the thread was trying to step over a breakpoint, it | |
7229 | has already succeeded). It's what keep_going would do too, | |
7230 | if we called it. Do this before trying to insert the sss | |
7231 | breakpoint, otherwise if we were previously trying to step | |
7232 | over this exact address in another thread, the breakpoint is | |
7233 | skipped. */ | |
7234 | clear_step_over_info (); | |
7235 | tp->control.trap_expected = 0; | |
7236 | ||
7237 | insert_single_step_breakpoint (get_frame_arch (frame), | |
7238 | get_frame_address_space (frame), | |
7239 | stop_pc); | |
7240 | ||
372316f1 | 7241 | tp->resumed = 1; |
fbea99ea | 7242 | resume_ptid = internal_resume_ptid (tp->control.stepping_command); |
2ac7589c PA |
7243 | do_target_resume (resume_ptid, 0, GDB_SIGNAL_0); |
7244 | } | |
7245 | else | |
7246 | { | |
7247 | if (debug_infrun) | |
7248 | fprintf_unfiltered (gdb_stdlog, | |
7249 | "infrun: expected thread still hasn't advanced\n"); | |
7250 | ||
7251 | keep_going_pass_signal (ecs); | |
7252 | } | |
7253 | return 1; | |
c447ac0b PA |
7254 | } |
7255 | ||
8b061563 PA |
7256 | /* Is thread TP in the middle of (software or hardware) |
7257 | single-stepping? (Note the result of this function must never be | |
7258 | passed directly as target_resume's STEP parameter.) */ | |
104c1213 | 7259 | |
a289b8f6 | 7260 | static int |
b3444185 | 7261 | currently_stepping (struct thread_info *tp) |
a7212384 | 7262 | { |
8358c15c JK |
7263 | return ((tp->control.step_range_end |
7264 | && tp->control.step_resume_breakpoint == NULL) | |
7265 | || tp->control.trap_expected | |
af48d08f | 7266 | || tp->stepped_breakpoint |
8358c15c | 7267 | || bpstat_should_step ()); |
a7212384 UW |
7268 | } |
7269 | ||
b2175913 MS |
7270 | /* Inferior has stepped into a subroutine call with source code that |
7271 | we should not step over. Do step to the first line of code in | |
7272 | it. */ | |
c2c6d25f JM |
7273 | |
7274 | static void | |
568d6575 UW |
7275 | handle_step_into_function (struct gdbarch *gdbarch, |
7276 | struct execution_control_state *ecs) | |
c2c6d25f | 7277 | { |
7e324e48 GB |
7278 | fill_in_stop_func (gdbarch, ecs); |
7279 | ||
51abb421 | 7280 | compunit_symtab *cust = find_pc_compunit_symtab (stop_pc); |
43f3e411 | 7281 | if (cust != NULL && compunit_language (cust) != language_asm) |
46a62268 YQ |
7282 | ecs->stop_func_start |
7283 | = gdbarch_skip_prologue_noexcept (gdbarch, ecs->stop_func_start); | |
c2c6d25f | 7284 | |
51abb421 | 7285 | symtab_and_line stop_func_sal = find_pc_line (ecs->stop_func_start, 0); |
c2c6d25f JM |
7286 | /* Use the step_resume_break to step until the end of the prologue, |
7287 | even if that involves jumps (as it seems to on the vax under | |
7288 | 4.2). */ | |
7289 | /* If the prologue ends in the middle of a source line, continue to | |
7290 | the end of that source line (if it is still within the function). | |
7291 | Otherwise, just go to end of prologue. */ | |
2afb61aa PA |
7292 | if (stop_func_sal.end |
7293 | && stop_func_sal.pc != ecs->stop_func_start | |
7294 | && stop_func_sal.end < ecs->stop_func_end) | |
7295 | ecs->stop_func_start = stop_func_sal.end; | |
c2c6d25f | 7296 | |
2dbd5e30 KB |
7297 | /* Architectures which require breakpoint adjustment might not be able |
7298 | to place a breakpoint at the computed address. If so, the test | |
7299 | ``ecs->stop_func_start == stop_pc'' will never succeed. Adjust | |
7300 | ecs->stop_func_start to an address at which a breakpoint may be | |
7301 | legitimately placed. | |
8fb3e588 | 7302 | |
2dbd5e30 KB |
7303 | Note: kevinb/2004-01-19: On FR-V, if this adjustment is not |
7304 | made, GDB will enter an infinite loop when stepping through | |
7305 | optimized code consisting of VLIW instructions which contain | |
7306 | subinstructions corresponding to different source lines. On | |
7307 | FR-V, it's not permitted to place a breakpoint on any but the | |
7308 | first subinstruction of a VLIW instruction. When a breakpoint is | |
7309 | set, GDB will adjust the breakpoint address to the beginning of | |
7310 | the VLIW instruction. Thus, we need to make the corresponding | |
7311 | adjustment here when computing the stop address. */ | |
8fb3e588 | 7312 | |
568d6575 | 7313 | if (gdbarch_adjust_breakpoint_address_p (gdbarch)) |
2dbd5e30 KB |
7314 | { |
7315 | ecs->stop_func_start | |
568d6575 | 7316 | = gdbarch_adjust_breakpoint_address (gdbarch, |
8fb3e588 | 7317 | ecs->stop_func_start); |
2dbd5e30 KB |
7318 | } |
7319 | ||
c2c6d25f JM |
7320 | if (ecs->stop_func_start == stop_pc) |
7321 | { | |
7322 | /* We are already there: stop now. */ | |
bdc36728 | 7323 | end_stepping_range (ecs); |
c2c6d25f JM |
7324 | return; |
7325 | } | |
7326 | else | |
7327 | { | |
7328 | /* Put the step-breakpoint there and go until there. */ | |
51abb421 | 7329 | symtab_and_line sr_sal; |
c2c6d25f JM |
7330 | sr_sal.pc = ecs->stop_func_start; |
7331 | sr_sal.section = find_pc_overlay (ecs->stop_func_start); | |
6c95b8df | 7332 | sr_sal.pspace = get_frame_program_space (get_current_frame ()); |
44cbf7b5 | 7333 | |
c2c6d25f | 7334 | /* Do not specify what the fp should be when we stop since on |
488f131b JB |
7335 | some machines the prologue is where the new fp value is |
7336 | established. */ | |
a6d9a66e | 7337 | insert_step_resume_breakpoint_at_sal (gdbarch, sr_sal, null_frame_id); |
c2c6d25f JM |
7338 | |
7339 | /* And make sure stepping stops right away then. */ | |
16c381f0 JK |
7340 | ecs->event_thread->control.step_range_end |
7341 | = ecs->event_thread->control.step_range_start; | |
c2c6d25f JM |
7342 | } |
7343 | keep_going (ecs); | |
7344 | } | |
d4f3574e | 7345 | |
b2175913 MS |
7346 | /* Inferior has stepped backward into a subroutine call with source |
7347 | code that we should not step over. Do step to the beginning of the | |
7348 | last line of code in it. */ | |
7349 | ||
7350 | static void | |
568d6575 UW |
7351 | handle_step_into_function_backward (struct gdbarch *gdbarch, |
7352 | struct execution_control_state *ecs) | |
b2175913 | 7353 | { |
43f3e411 | 7354 | struct compunit_symtab *cust; |
167e4384 | 7355 | struct symtab_and_line stop_func_sal; |
b2175913 | 7356 | |
7e324e48 GB |
7357 | fill_in_stop_func (gdbarch, ecs); |
7358 | ||
43f3e411 DE |
7359 | cust = find_pc_compunit_symtab (stop_pc); |
7360 | if (cust != NULL && compunit_language (cust) != language_asm) | |
46a62268 YQ |
7361 | ecs->stop_func_start |
7362 | = gdbarch_skip_prologue_noexcept (gdbarch, ecs->stop_func_start); | |
b2175913 MS |
7363 | |
7364 | stop_func_sal = find_pc_line (stop_pc, 0); | |
7365 | ||
7366 | /* OK, we're just going to keep stepping here. */ | |
7367 | if (stop_func_sal.pc == stop_pc) | |
7368 | { | |
7369 | /* We're there already. Just stop stepping now. */ | |
bdc36728 | 7370 | end_stepping_range (ecs); |
b2175913 MS |
7371 | } |
7372 | else | |
7373 | { | |
7374 | /* Else just reset the step range and keep going. | |
7375 | No step-resume breakpoint, they don't work for | |
7376 | epilogues, which can have multiple entry paths. */ | |
16c381f0 JK |
7377 | ecs->event_thread->control.step_range_start = stop_func_sal.pc; |
7378 | ecs->event_thread->control.step_range_end = stop_func_sal.end; | |
b2175913 MS |
7379 | keep_going (ecs); |
7380 | } | |
7381 | return; | |
7382 | } | |
7383 | ||
d3169d93 | 7384 | /* Insert a "step-resume breakpoint" at SR_SAL with frame ID SR_ID. |
44cbf7b5 AC |
7385 | This is used to both functions and to skip over code. */ |
7386 | ||
7387 | static void | |
2c03e5be PA |
7388 | insert_step_resume_breakpoint_at_sal_1 (struct gdbarch *gdbarch, |
7389 | struct symtab_and_line sr_sal, | |
7390 | struct frame_id sr_id, | |
7391 | enum bptype sr_type) | |
44cbf7b5 | 7392 | { |
611c83ae PA |
7393 | /* There should never be more than one step-resume or longjmp-resume |
7394 | breakpoint per thread, so we should never be setting a new | |
44cbf7b5 | 7395 | step_resume_breakpoint when one is already active. */ |
8358c15c | 7396 | gdb_assert (inferior_thread ()->control.step_resume_breakpoint == NULL); |
2c03e5be | 7397 | gdb_assert (sr_type == bp_step_resume || sr_type == bp_hp_step_resume); |
d3169d93 DJ |
7398 | |
7399 | if (debug_infrun) | |
7400 | fprintf_unfiltered (gdb_stdlog, | |
5af949e3 UW |
7401 | "infrun: inserting step-resume breakpoint at %s\n", |
7402 | paddress (gdbarch, sr_sal.pc)); | |
d3169d93 | 7403 | |
8358c15c | 7404 | inferior_thread ()->control.step_resume_breakpoint |
2c03e5be PA |
7405 | = set_momentary_breakpoint (gdbarch, sr_sal, sr_id, sr_type); |
7406 | } | |
7407 | ||
9da8c2a0 | 7408 | void |
2c03e5be PA |
7409 | insert_step_resume_breakpoint_at_sal (struct gdbarch *gdbarch, |
7410 | struct symtab_and_line sr_sal, | |
7411 | struct frame_id sr_id) | |
7412 | { | |
7413 | insert_step_resume_breakpoint_at_sal_1 (gdbarch, | |
7414 | sr_sal, sr_id, | |
7415 | bp_step_resume); | |
44cbf7b5 | 7416 | } |
7ce450bd | 7417 | |
2c03e5be PA |
7418 | /* Insert a "high-priority step-resume breakpoint" at RETURN_FRAME.pc. |
7419 | This is used to skip a potential signal handler. | |
7ce450bd | 7420 | |
14e60db5 DJ |
7421 | This is called with the interrupted function's frame. The signal |
7422 | handler, when it returns, will resume the interrupted function at | |
7423 | RETURN_FRAME.pc. */ | |
d303a6c7 AC |
7424 | |
7425 | static void | |
2c03e5be | 7426 | insert_hp_step_resume_breakpoint_at_frame (struct frame_info *return_frame) |
d303a6c7 | 7427 | { |
f4c1edd8 | 7428 | gdb_assert (return_frame != NULL); |
d303a6c7 | 7429 | |
51abb421 PA |
7430 | struct gdbarch *gdbarch = get_frame_arch (return_frame); |
7431 | ||
7432 | symtab_and_line sr_sal; | |
568d6575 | 7433 | sr_sal.pc = gdbarch_addr_bits_remove (gdbarch, get_frame_pc (return_frame)); |
d303a6c7 | 7434 | sr_sal.section = find_pc_overlay (sr_sal.pc); |
6c95b8df | 7435 | sr_sal.pspace = get_frame_program_space (return_frame); |
d303a6c7 | 7436 | |
2c03e5be PA |
7437 | insert_step_resume_breakpoint_at_sal_1 (gdbarch, sr_sal, |
7438 | get_stack_frame_id (return_frame), | |
7439 | bp_hp_step_resume); | |
d303a6c7 AC |
7440 | } |
7441 | ||
2c03e5be PA |
7442 | /* Insert a "step-resume breakpoint" at the previous frame's PC. This |
7443 | is used to skip a function after stepping into it (for "next" or if | |
7444 | the called function has no debugging information). | |
14e60db5 DJ |
7445 | |
7446 | The current function has almost always been reached by single | |
7447 | stepping a call or return instruction. NEXT_FRAME belongs to the | |
7448 | current function, and the breakpoint will be set at the caller's | |
7449 | resume address. | |
7450 | ||
7451 | This is a separate function rather than reusing | |
2c03e5be | 7452 | insert_hp_step_resume_breakpoint_at_frame in order to avoid |
14e60db5 | 7453 | get_prev_frame, which may stop prematurely (see the implementation |
c7ce8faa | 7454 | of frame_unwind_caller_id for an example). */ |
14e60db5 DJ |
7455 | |
7456 | static void | |
7457 | insert_step_resume_breakpoint_at_caller (struct frame_info *next_frame) | |
7458 | { | |
14e60db5 DJ |
7459 | /* We shouldn't have gotten here if we don't know where the call site |
7460 | is. */ | |
c7ce8faa | 7461 | gdb_assert (frame_id_p (frame_unwind_caller_id (next_frame))); |
14e60db5 | 7462 | |
51abb421 | 7463 | struct gdbarch *gdbarch = frame_unwind_caller_arch (next_frame); |
14e60db5 | 7464 | |
51abb421 | 7465 | symtab_and_line sr_sal; |
c7ce8faa DJ |
7466 | sr_sal.pc = gdbarch_addr_bits_remove (gdbarch, |
7467 | frame_unwind_caller_pc (next_frame)); | |
14e60db5 | 7468 | sr_sal.section = find_pc_overlay (sr_sal.pc); |
6c95b8df | 7469 | sr_sal.pspace = frame_unwind_program_space (next_frame); |
14e60db5 | 7470 | |
a6d9a66e | 7471 | insert_step_resume_breakpoint_at_sal (gdbarch, sr_sal, |
c7ce8faa | 7472 | frame_unwind_caller_id (next_frame)); |
14e60db5 DJ |
7473 | } |
7474 | ||
611c83ae PA |
7475 | /* Insert a "longjmp-resume" breakpoint at PC. This is used to set a |
7476 | new breakpoint at the target of a jmp_buf. The handling of | |
7477 | longjmp-resume uses the same mechanisms used for handling | |
7478 | "step-resume" breakpoints. */ | |
7479 | ||
7480 | static void | |
a6d9a66e | 7481 | insert_longjmp_resume_breakpoint (struct gdbarch *gdbarch, CORE_ADDR pc) |
611c83ae | 7482 | { |
e81a37f7 TT |
7483 | /* There should never be more than one longjmp-resume breakpoint per |
7484 | thread, so we should never be setting a new | |
611c83ae | 7485 | longjmp_resume_breakpoint when one is already active. */ |
e81a37f7 | 7486 | gdb_assert (inferior_thread ()->control.exception_resume_breakpoint == NULL); |
611c83ae PA |
7487 | |
7488 | if (debug_infrun) | |
7489 | fprintf_unfiltered (gdb_stdlog, | |
5af949e3 UW |
7490 | "infrun: inserting longjmp-resume breakpoint at %s\n", |
7491 | paddress (gdbarch, pc)); | |
611c83ae | 7492 | |
e81a37f7 | 7493 | inferior_thread ()->control.exception_resume_breakpoint = |
a6d9a66e | 7494 | set_momentary_breakpoint_at_pc (gdbarch, pc, bp_longjmp_resume); |
611c83ae PA |
7495 | } |
7496 | ||
186c406b TT |
7497 | /* Insert an exception resume breakpoint. TP is the thread throwing |
7498 | the exception. The block B is the block of the unwinder debug hook | |
7499 | function. FRAME is the frame corresponding to the call to this | |
7500 | function. SYM is the symbol of the function argument holding the | |
7501 | target PC of the exception. */ | |
7502 | ||
7503 | static void | |
7504 | insert_exception_resume_breakpoint (struct thread_info *tp, | |
3977b71f | 7505 | const struct block *b, |
186c406b TT |
7506 | struct frame_info *frame, |
7507 | struct symbol *sym) | |
7508 | { | |
492d29ea | 7509 | TRY |
186c406b | 7510 | { |
63e43d3a | 7511 | struct block_symbol vsym; |
186c406b TT |
7512 | struct value *value; |
7513 | CORE_ADDR handler; | |
7514 | struct breakpoint *bp; | |
7515 | ||
63e43d3a PMR |
7516 | vsym = lookup_symbol (SYMBOL_LINKAGE_NAME (sym), b, VAR_DOMAIN, NULL); |
7517 | value = read_var_value (vsym.symbol, vsym.block, frame); | |
186c406b TT |
7518 | /* If the value was optimized out, revert to the old behavior. */ |
7519 | if (! value_optimized_out (value)) | |
7520 | { | |
7521 | handler = value_as_address (value); | |
7522 | ||
7523 | if (debug_infrun) | |
7524 | fprintf_unfiltered (gdb_stdlog, | |
7525 | "infrun: exception resume at %lx\n", | |
7526 | (unsigned long) handler); | |
7527 | ||
7528 | bp = set_momentary_breakpoint_at_pc (get_frame_arch (frame), | |
7529 | handler, bp_exception_resume); | |
c70a6932 JK |
7530 | |
7531 | /* set_momentary_breakpoint_at_pc invalidates FRAME. */ | |
7532 | frame = NULL; | |
7533 | ||
5d5658a1 | 7534 | bp->thread = tp->global_num; |
186c406b TT |
7535 | inferior_thread ()->control.exception_resume_breakpoint = bp; |
7536 | } | |
7537 | } | |
492d29ea PA |
7538 | CATCH (e, RETURN_MASK_ERROR) |
7539 | { | |
7540 | /* We want to ignore errors here. */ | |
7541 | } | |
7542 | END_CATCH | |
186c406b TT |
7543 | } |
7544 | ||
28106bc2 SDJ |
7545 | /* A helper for check_exception_resume that sets an |
7546 | exception-breakpoint based on a SystemTap probe. */ | |
7547 | ||
7548 | static void | |
7549 | insert_exception_resume_from_probe (struct thread_info *tp, | |
729662a5 | 7550 | const struct bound_probe *probe, |
28106bc2 SDJ |
7551 | struct frame_info *frame) |
7552 | { | |
7553 | struct value *arg_value; | |
7554 | CORE_ADDR handler; | |
7555 | struct breakpoint *bp; | |
7556 | ||
7557 | arg_value = probe_safe_evaluate_at_pc (frame, 1); | |
7558 | if (!arg_value) | |
7559 | return; | |
7560 | ||
7561 | handler = value_as_address (arg_value); | |
7562 | ||
7563 | if (debug_infrun) | |
7564 | fprintf_unfiltered (gdb_stdlog, | |
7565 | "infrun: exception resume at %s\n", | |
6bac7473 | 7566 | paddress (get_objfile_arch (probe->objfile), |
28106bc2 SDJ |
7567 | handler)); |
7568 | ||
7569 | bp = set_momentary_breakpoint_at_pc (get_frame_arch (frame), | |
7570 | handler, bp_exception_resume); | |
5d5658a1 | 7571 | bp->thread = tp->global_num; |
28106bc2 SDJ |
7572 | inferior_thread ()->control.exception_resume_breakpoint = bp; |
7573 | } | |
7574 | ||
186c406b TT |
7575 | /* This is called when an exception has been intercepted. Check to |
7576 | see whether the exception's destination is of interest, and if so, | |
7577 | set an exception resume breakpoint there. */ | |
7578 | ||
7579 | static void | |
7580 | check_exception_resume (struct execution_control_state *ecs, | |
28106bc2 | 7581 | struct frame_info *frame) |
186c406b | 7582 | { |
729662a5 | 7583 | struct bound_probe probe; |
28106bc2 SDJ |
7584 | struct symbol *func; |
7585 | ||
7586 | /* First see if this exception unwinding breakpoint was set via a | |
7587 | SystemTap probe point. If so, the probe has two arguments: the | |
7588 | CFA and the HANDLER. We ignore the CFA, extract the handler, and | |
7589 | set a breakpoint there. */ | |
6bac7473 | 7590 | probe = find_probe_by_pc (get_frame_pc (frame)); |
729662a5 | 7591 | if (probe.probe) |
28106bc2 | 7592 | { |
729662a5 | 7593 | insert_exception_resume_from_probe (ecs->event_thread, &probe, frame); |
28106bc2 SDJ |
7594 | return; |
7595 | } | |
7596 | ||
7597 | func = get_frame_function (frame); | |
7598 | if (!func) | |
7599 | return; | |
186c406b | 7600 | |
492d29ea | 7601 | TRY |
186c406b | 7602 | { |
3977b71f | 7603 | const struct block *b; |
8157b174 | 7604 | struct block_iterator iter; |
186c406b TT |
7605 | struct symbol *sym; |
7606 | int argno = 0; | |
7607 | ||
7608 | /* The exception breakpoint is a thread-specific breakpoint on | |
7609 | the unwinder's debug hook, declared as: | |
7610 | ||
7611 | void _Unwind_DebugHook (void *cfa, void *handler); | |
7612 | ||
7613 | The CFA argument indicates the frame to which control is | |
7614 | about to be transferred. HANDLER is the destination PC. | |
7615 | ||
7616 | We ignore the CFA and set a temporary breakpoint at HANDLER. | |
7617 | This is not extremely efficient but it avoids issues in gdb | |
7618 | with computing the DWARF CFA, and it also works even in weird | |
7619 | cases such as throwing an exception from inside a signal | |
7620 | handler. */ | |
7621 | ||
7622 | b = SYMBOL_BLOCK_VALUE (func); | |
7623 | ALL_BLOCK_SYMBOLS (b, iter, sym) | |
7624 | { | |
7625 | if (!SYMBOL_IS_ARGUMENT (sym)) | |
7626 | continue; | |
7627 | ||
7628 | if (argno == 0) | |
7629 | ++argno; | |
7630 | else | |
7631 | { | |
7632 | insert_exception_resume_breakpoint (ecs->event_thread, | |
7633 | b, frame, sym); | |
7634 | break; | |
7635 | } | |
7636 | } | |
7637 | } | |
492d29ea PA |
7638 | CATCH (e, RETURN_MASK_ERROR) |
7639 | { | |
7640 | } | |
7641 | END_CATCH | |
186c406b TT |
7642 | } |
7643 | ||
104c1213 | 7644 | static void |
22bcd14b | 7645 | stop_waiting (struct execution_control_state *ecs) |
104c1213 | 7646 | { |
527159b7 | 7647 | if (debug_infrun) |
22bcd14b | 7648 | fprintf_unfiltered (gdb_stdlog, "infrun: stop_waiting\n"); |
527159b7 | 7649 | |
cd0fc7c3 SS |
7650 | /* Let callers know we don't want to wait for the inferior anymore. */ |
7651 | ecs->wait_some_more = 0; | |
fbea99ea PA |
7652 | |
7653 | /* If all-stop, but the target is always in non-stop mode, stop all | |
7654 | threads now that we're presenting the stop to the user. */ | |
7655 | if (!non_stop && target_is_non_stop_p ()) | |
7656 | stop_all_threads (); | |
cd0fc7c3 SS |
7657 | } |
7658 | ||
4d9d9d04 PA |
7659 | /* Like keep_going, but passes the signal to the inferior, even if the |
7660 | signal is set to nopass. */ | |
d4f3574e SS |
7661 | |
7662 | static void | |
4d9d9d04 | 7663 | keep_going_pass_signal (struct execution_control_state *ecs) |
d4f3574e | 7664 | { |
c4dbc9af PA |
7665 | /* Make sure normal_stop is called if we get a QUIT handled before |
7666 | reaching resume. */ | |
7667 | struct cleanup *old_cleanups = make_cleanup (resume_cleanups, 0); | |
7668 | ||
4d9d9d04 | 7669 | gdb_assert (ptid_equal (ecs->event_thread->ptid, inferior_ptid)); |
372316f1 | 7670 | gdb_assert (!ecs->event_thread->resumed); |
4d9d9d04 | 7671 | |
d4f3574e | 7672 | /* Save the pc before execution, to compare with pc after stop. */ |
fb14de7b UW |
7673 | ecs->event_thread->prev_pc |
7674 | = regcache_read_pc (get_thread_regcache (ecs->ptid)); | |
d4f3574e | 7675 | |
4d9d9d04 | 7676 | if (ecs->event_thread->control.trap_expected) |
d4f3574e | 7677 | { |
4d9d9d04 PA |
7678 | struct thread_info *tp = ecs->event_thread; |
7679 | ||
7680 | if (debug_infrun) | |
7681 | fprintf_unfiltered (gdb_stdlog, | |
7682 | "infrun: %s has trap_expected set, " | |
7683 | "resuming to collect trap\n", | |
7684 | target_pid_to_str (tp->ptid)); | |
7685 | ||
a9ba6bae PA |
7686 | /* We haven't yet gotten our trap, and either: intercepted a |
7687 | non-signal event (e.g., a fork); or took a signal which we | |
7688 | are supposed to pass through to the inferior. Simply | |
7689 | continue. */ | |
c4dbc9af | 7690 | discard_cleanups (old_cleanups); |
64ce06e4 | 7691 | resume (ecs->event_thread->suspend.stop_signal); |
d4f3574e | 7692 | } |
372316f1 PA |
7693 | else if (step_over_info_valid_p ()) |
7694 | { | |
7695 | /* Another thread is stepping over a breakpoint in-line. If | |
7696 | this thread needs a step-over too, queue the request. In | |
7697 | either case, this resume must be deferred for later. */ | |
7698 | struct thread_info *tp = ecs->event_thread; | |
7699 | ||
7700 | if (ecs->hit_singlestep_breakpoint | |
7701 | || thread_still_needs_step_over (tp)) | |
7702 | { | |
7703 | if (debug_infrun) | |
7704 | fprintf_unfiltered (gdb_stdlog, | |
7705 | "infrun: step-over already in progress: " | |
7706 | "step-over for %s deferred\n", | |
7707 | target_pid_to_str (tp->ptid)); | |
7708 | thread_step_over_chain_enqueue (tp); | |
7709 | } | |
7710 | else | |
7711 | { | |
7712 | if (debug_infrun) | |
7713 | fprintf_unfiltered (gdb_stdlog, | |
7714 | "infrun: step-over in progress: " | |
7715 | "resume of %s deferred\n", | |
7716 | target_pid_to_str (tp->ptid)); | |
7717 | } | |
7718 | ||
7719 | discard_cleanups (old_cleanups); | |
7720 | } | |
d4f3574e SS |
7721 | else |
7722 | { | |
31e77af2 | 7723 | struct regcache *regcache = get_current_regcache (); |
963f9c80 PA |
7724 | int remove_bp; |
7725 | int remove_wps; | |
8d297bbf | 7726 | step_over_what step_what; |
31e77af2 | 7727 | |
d4f3574e | 7728 | /* Either the trap was not expected, but we are continuing |
a9ba6bae PA |
7729 | anyway (if we got a signal, the user asked it be passed to |
7730 | the child) | |
7731 | -- or -- | |
7732 | We got our expected trap, but decided we should resume from | |
7733 | it. | |
d4f3574e | 7734 | |
a9ba6bae | 7735 | We're going to run this baby now! |
d4f3574e | 7736 | |
c36b740a VP |
7737 | Note that insert_breakpoints won't try to re-insert |
7738 | already inserted breakpoints. Therefore, we don't | |
7739 | care if breakpoints were already inserted, or not. */ | |
a9ba6bae | 7740 | |
31e77af2 PA |
7741 | /* If we need to step over a breakpoint, and we're not using |
7742 | displaced stepping to do so, insert all breakpoints | |
7743 | (watchpoints, etc.) but the one we're stepping over, step one | |
7744 | instruction, and then re-insert the breakpoint when that step | |
7745 | is finished. */ | |
963f9c80 | 7746 | |
6c4cfb24 PA |
7747 | step_what = thread_still_needs_step_over (ecs->event_thread); |
7748 | ||
963f9c80 | 7749 | remove_bp = (ecs->hit_singlestep_breakpoint |
6c4cfb24 PA |
7750 | || (step_what & STEP_OVER_BREAKPOINT)); |
7751 | remove_wps = (step_what & STEP_OVER_WATCHPOINT); | |
963f9c80 | 7752 | |
cb71640d PA |
7753 | /* We can't use displaced stepping if we need to step past a |
7754 | watchpoint. The instruction copied to the scratch pad would | |
7755 | still trigger the watchpoint. */ | |
7756 | if (remove_bp | |
3fc8eb30 | 7757 | && (remove_wps || !use_displaced_stepping (ecs->event_thread))) |
45e8c884 | 7758 | { |
31e77af2 | 7759 | set_step_over_info (get_regcache_aspace (regcache), |
21edc42f YQ |
7760 | regcache_read_pc (regcache), remove_wps, |
7761 | ecs->event_thread->global_num); | |
45e8c884 | 7762 | } |
963f9c80 | 7763 | else if (remove_wps) |
21edc42f | 7764 | set_step_over_info (NULL, 0, remove_wps, -1); |
372316f1 PA |
7765 | |
7766 | /* If we now need to do an in-line step-over, we need to stop | |
7767 | all other threads. Note this must be done before | |
7768 | insert_breakpoints below, because that removes the breakpoint | |
7769 | we're about to step over, otherwise other threads could miss | |
7770 | it. */ | |
fbea99ea | 7771 | if (step_over_info_valid_p () && target_is_non_stop_p ()) |
372316f1 | 7772 | stop_all_threads (); |
abbb1732 | 7773 | |
31e77af2 | 7774 | /* Stop stepping if inserting breakpoints fails. */ |
492d29ea | 7775 | TRY |
31e77af2 PA |
7776 | { |
7777 | insert_breakpoints (); | |
7778 | } | |
492d29ea | 7779 | CATCH (e, RETURN_MASK_ERROR) |
31e77af2 PA |
7780 | { |
7781 | exception_print (gdb_stderr, e); | |
22bcd14b | 7782 | stop_waiting (ecs); |
de1fe8c8 | 7783 | discard_cleanups (old_cleanups); |
31e77af2 | 7784 | return; |
d4f3574e | 7785 | } |
492d29ea | 7786 | END_CATCH |
d4f3574e | 7787 | |
963f9c80 | 7788 | ecs->event_thread->control.trap_expected = (remove_bp || remove_wps); |
d4f3574e | 7789 | |
c4dbc9af | 7790 | discard_cleanups (old_cleanups); |
64ce06e4 | 7791 | resume (ecs->event_thread->suspend.stop_signal); |
d4f3574e SS |
7792 | } |
7793 | ||
488f131b | 7794 | prepare_to_wait (ecs); |
d4f3574e SS |
7795 | } |
7796 | ||
4d9d9d04 PA |
7797 | /* Called when we should continue running the inferior, because the |
7798 | current event doesn't cause a user visible stop. This does the | |
7799 | resuming part; waiting for the next event is done elsewhere. */ | |
7800 | ||
7801 | static void | |
7802 | keep_going (struct execution_control_state *ecs) | |
7803 | { | |
7804 | if (ecs->event_thread->control.trap_expected | |
7805 | && ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP) | |
7806 | ecs->event_thread->control.trap_expected = 0; | |
7807 | ||
7808 | if (!signal_program[ecs->event_thread->suspend.stop_signal]) | |
7809 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; | |
7810 | keep_going_pass_signal (ecs); | |
7811 | } | |
7812 | ||
104c1213 JM |
7813 | /* This function normally comes after a resume, before |
7814 | handle_inferior_event exits. It takes care of any last bits of | |
7815 | housekeeping, and sets the all-important wait_some_more flag. */ | |
cd0fc7c3 | 7816 | |
104c1213 JM |
7817 | static void |
7818 | prepare_to_wait (struct execution_control_state *ecs) | |
cd0fc7c3 | 7819 | { |
527159b7 | 7820 | if (debug_infrun) |
8a9de0e4 | 7821 | fprintf_unfiltered (gdb_stdlog, "infrun: prepare_to_wait\n"); |
104c1213 | 7822 | |
104c1213 | 7823 | ecs->wait_some_more = 1; |
0b333c5e PA |
7824 | |
7825 | if (!target_is_async_p ()) | |
7826 | mark_infrun_async_event_handler (); | |
c906108c | 7827 | } |
11cf8741 | 7828 | |
fd664c91 | 7829 | /* We are done with the step range of a step/next/si/ni command. |
b57bacec | 7830 | Called once for each n of a "step n" operation. */ |
fd664c91 PA |
7831 | |
7832 | static void | |
bdc36728 | 7833 | end_stepping_range (struct execution_control_state *ecs) |
fd664c91 | 7834 | { |
bdc36728 | 7835 | ecs->event_thread->control.stop_step = 1; |
bdc36728 | 7836 | stop_waiting (ecs); |
fd664c91 PA |
7837 | } |
7838 | ||
33d62d64 JK |
7839 | /* Several print_*_reason functions to print why the inferior has stopped. |
7840 | We always print something when the inferior exits, or receives a signal. | |
7841 | The rest of the cases are dealt with later on in normal_stop and | |
7842 | print_it_typical. Ideally there should be a call to one of these | |
7843 | print_*_reason functions functions from handle_inferior_event each time | |
22bcd14b | 7844 | stop_waiting is called. |
33d62d64 | 7845 | |
fd664c91 PA |
7846 | Note that we don't call these directly, instead we delegate that to |
7847 | the interpreters, through observers. Interpreters then call these | |
7848 | with whatever uiout is right. */ | |
33d62d64 | 7849 | |
fd664c91 PA |
7850 | void |
7851 | print_end_stepping_range_reason (struct ui_out *uiout) | |
33d62d64 | 7852 | { |
fd664c91 | 7853 | /* For CLI-like interpreters, print nothing. */ |
33d62d64 | 7854 | |
112e8700 | 7855 | if (uiout->is_mi_like_p ()) |
fd664c91 | 7856 | { |
112e8700 | 7857 | uiout->field_string ("reason", |
fd664c91 PA |
7858 | async_reason_lookup (EXEC_ASYNC_END_STEPPING_RANGE)); |
7859 | } | |
7860 | } | |
33d62d64 | 7861 | |
fd664c91 PA |
7862 | void |
7863 | print_signal_exited_reason (struct ui_out *uiout, enum gdb_signal siggnal) | |
11cf8741 | 7864 | { |
33d62d64 | 7865 | annotate_signalled (); |
112e8700 SM |
7866 | if (uiout->is_mi_like_p ()) |
7867 | uiout->field_string | |
7868 | ("reason", async_reason_lookup (EXEC_ASYNC_EXITED_SIGNALLED)); | |
7869 | uiout->text ("\nProgram terminated with signal "); | |
33d62d64 | 7870 | annotate_signal_name (); |
112e8700 | 7871 | uiout->field_string ("signal-name", |
2ea28649 | 7872 | gdb_signal_to_name (siggnal)); |
33d62d64 | 7873 | annotate_signal_name_end (); |
112e8700 | 7874 | uiout->text (", "); |
33d62d64 | 7875 | annotate_signal_string (); |
112e8700 | 7876 | uiout->field_string ("signal-meaning", |
2ea28649 | 7877 | gdb_signal_to_string (siggnal)); |
33d62d64 | 7878 | annotate_signal_string_end (); |
112e8700 SM |
7879 | uiout->text (".\n"); |
7880 | uiout->text ("The program no longer exists.\n"); | |
33d62d64 JK |
7881 | } |
7882 | ||
fd664c91 PA |
7883 | void |
7884 | print_exited_reason (struct ui_out *uiout, int exitstatus) | |
33d62d64 | 7885 | { |
fda326dd TT |
7886 | struct inferior *inf = current_inferior (); |
7887 | const char *pidstr = target_pid_to_str (pid_to_ptid (inf->pid)); | |
7888 | ||
33d62d64 JK |
7889 | annotate_exited (exitstatus); |
7890 | if (exitstatus) | |
7891 | { | |
112e8700 SM |
7892 | if (uiout->is_mi_like_p ()) |
7893 | uiout->field_string ("reason", async_reason_lookup (EXEC_ASYNC_EXITED)); | |
7894 | uiout->text ("[Inferior "); | |
7895 | uiout->text (plongest (inf->num)); | |
7896 | uiout->text (" ("); | |
7897 | uiout->text (pidstr); | |
7898 | uiout->text (") exited with code "); | |
7899 | uiout->field_fmt ("exit-code", "0%o", (unsigned int) exitstatus); | |
7900 | uiout->text ("]\n"); | |
33d62d64 JK |
7901 | } |
7902 | else | |
11cf8741 | 7903 | { |
112e8700 SM |
7904 | if (uiout->is_mi_like_p ()) |
7905 | uiout->field_string | |
7906 | ("reason", async_reason_lookup (EXEC_ASYNC_EXITED_NORMALLY)); | |
7907 | uiout->text ("[Inferior "); | |
7908 | uiout->text (plongest (inf->num)); | |
7909 | uiout->text (" ("); | |
7910 | uiout->text (pidstr); | |
7911 | uiout->text (") exited normally]\n"); | |
33d62d64 | 7912 | } |
33d62d64 JK |
7913 | } |
7914 | ||
012b3a21 WT |
7915 | /* Some targets/architectures can do extra processing/display of |
7916 | segmentation faults. E.g., Intel MPX boundary faults. | |
7917 | Call the architecture dependent function to handle the fault. */ | |
7918 | ||
7919 | static void | |
7920 | handle_segmentation_fault (struct ui_out *uiout) | |
7921 | { | |
7922 | struct regcache *regcache = get_current_regcache (); | |
7923 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
7924 | ||
7925 | if (gdbarch_handle_segmentation_fault_p (gdbarch)) | |
7926 | gdbarch_handle_segmentation_fault (gdbarch, uiout); | |
7927 | } | |
7928 | ||
fd664c91 PA |
7929 | void |
7930 | print_signal_received_reason (struct ui_out *uiout, enum gdb_signal siggnal) | |
33d62d64 | 7931 | { |
f303dbd6 PA |
7932 | struct thread_info *thr = inferior_thread (); |
7933 | ||
33d62d64 JK |
7934 | annotate_signal (); |
7935 | ||
112e8700 | 7936 | if (uiout->is_mi_like_p ()) |
f303dbd6 PA |
7937 | ; |
7938 | else if (show_thread_that_caused_stop ()) | |
33d62d64 | 7939 | { |
f303dbd6 | 7940 | const char *name; |
33d62d64 | 7941 | |
112e8700 SM |
7942 | uiout->text ("\nThread "); |
7943 | uiout->field_fmt ("thread-id", "%s", print_thread_id (thr)); | |
f303dbd6 PA |
7944 | |
7945 | name = thr->name != NULL ? thr->name : target_thread_name (thr); | |
7946 | if (name != NULL) | |
7947 | { | |
112e8700 SM |
7948 | uiout->text (" \""); |
7949 | uiout->field_fmt ("name", "%s", name); | |
7950 | uiout->text ("\""); | |
f303dbd6 | 7951 | } |
33d62d64 | 7952 | } |
f303dbd6 | 7953 | else |
112e8700 | 7954 | uiout->text ("\nProgram"); |
f303dbd6 | 7955 | |
112e8700 SM |
7956 | if (siggnal == GDB_SIGNAL_0 && !uiout->is_mi_like_p ()) |
7957 | uiout->text (" stopped"); | |
33d62d64 JK |
7958 | else |
7959 | { | |
112e8700 | 7960 | uiout->text (" received signal "); |
8b93c638 | 7961 | annotate_signal_name (); |
112e8700 SM |
7962 | if (uiout->is_mi_like_p ()) |
7963 | uiout->field_string | |
7964 | ("reason", async_reason_lookup (EXEC_ASYNC_SIGNAL_RECEIVED)); | |
7965 | uiout->field_string ("signal-name", gdb_signal_to_name (siggnal)); | |
8b93c638 | 7966 | annotate_signal_name_end (); |
112e8700 | 7967 | uiout->text (", "); |
8b93c638 | 7968 | annotate_signal_string (); |
112e8700 | 7969 | uiout->field_string ("signal-meaning", gdb_signal_to_string (siggnal)); |
012b3a21 WT |
7970 | |
7971 | if (siggnal == GDB_SIGNAL_SEGV) | |
7972 | handle_segmentation_fault (uiout); | |
7973 | ||
8b93c638 | 7974 | annotate_signal_string_end (); |
33d62d64 | 7975 | } |
112e8700 | 7976 | uiout->text (".\n"); |
33d62d64 | 7977 | } |
252fbfc8 | 7978 | |
fd664c91 PA |
7979 | void |
7980 | print_no_history_reason (struct ui_out *uiout) | |
33d62d64 | 7981 | { |
112e8700 | 7982 | uiout->text ("\nNo more reverse-execution history.\n"); |
11cf8741 | 7983 | } |
43ff13b4 | 7984 | |
0c7e1a46 PA |
7985 | /* Print current location without a level number, if we have changed |
7986 | functions or hit a breakpoint. Print source line if we have one. | |
7987 | bpstat_print contains the logic deciding in detail what to print, | |
7988 | based on the event(s) that just occurred. */ | |
7989 | ||
243a9253 PA |
7990 | static void |
7991 | print_stop_location (struct target_waitstatus *ws) | |
0c7e1a46 PA |
7992 | { |
7993 | int bpstat_ret; | |
f486487f | 7994 | enum print_what source_flag; |
0c7e1a46 PA |
7995 | int do_frame_printing = 1; |
7996 | struct thread_info *tp = inferior_thread (); | |
7997 | ||
7998 | bpstat_ret = bpstat_print (tp->control.stop_bpstat, ws->kind); | |
7999 | switch (bpstat_ret) | |
8000 | { | |
8001 | case PRINT_UNKNOWN: | |
8002 | /* FIXME: cagney/2002-12-01: Given that a frame ID does (or | |
8003 | should) carry around the function and does (or should) use | |
8004 | that when doing a frame comparison. */ | |
8005 | if (tp->control.stop_step | |
8006 | && frame_id_eq (tp->control.step_frame_id, | |
8007 | get_frame_id (get_current_frame ())) | |
885eeb5b | 8008 | && tp->control.step_start_function == find_pc_function (stop_pc)) |
0c7e1a46 PA |
8009 | { |
8010 | /* Finished step, just print source line. */ | |
8011 | source_flag = SRC_LINE; | |
8012 | } | |
8013 | else | |
8014 | { | |
8015 | /* Print location and source line. */ | |
8016 | source_flag = SRC_AND_LOC; | |
8017 | } | |
8018 | break; | |
8019 | case PRINT_SRC_AND_LOC: | |
8020 | /* Print location and source line. */ | |
8021 | source_flag = SRC_AND_LOC; | |
8022 | break; | |
8023 | case PRINT_SRC_ONLY: | |
8024 | source_flag = SRC_LINE; | |
8025 | break; | |
8026 | case PRINT_NOTHING: | |
8027 | /* Something bogus. */ | |
8028 | source_flag = SRC_LINE; | |
8029 | do_frame_printing = 0; | |
8030 | break; | |
8031 | default: | |
8032 | internal_error (__FILE__, __LINE__, _("Unknown value.")); | |
8033 | } | |
8034 | ||
8035 | /* The behavior of this routine with respect to the source | |
8036 | flag is: | |
8037 | SRC_LINE: Print only source line | |
8038 | LOCATION: Print only location | |
8039 | SRC_AND_LOC: Print location and source line. */ | |
8040 | if (do_frame_printing) | |
8041 | print_stack_frame (get_selected_frame (NULL), 0, source_flag, 1); | |
243a9253 PA |
8042 | } |
8043 | ||
243a9253 PA |
8044 | /* See infrun.h. */ |
8045 | ||
8046 | void | |
8047 | print_stop_event (struct ui_out *uiout) | |
8048 | { | |
243a9253 PA |
8049 | struct target_waitstatus last; |
8050 | ptid_t last_ptid; | |
8051 | struct thread_info *tp; | |
8052 | ||
8053 | get_last_target_status (&last_ptid, &last); | |
8054 | ||
67ad9399 TT |
8055 | { |
8056 | scoped_restore save_uiout = make_scoped_restore (¤t_uiout, uiout); | |
0c7e1a46 | 8057 | |
67ad9399 | 8058 | print_stop_location (&last); |
243a9253 | 8059 | |
67ad9399 TT |
8060 | /* Display the auto-display expressions. */ |
8061 | do_displays (); | |
8062 | } | |
243a9253 PA |
8063 | |
8064 | tp = inferior_thread (); | |
8065 | if (tp->thread_fsm != NULL | |
8066 | && thread_fsm_finished_p (tp->thread_fsm)) | |
8067 | { | |
8068 | struct return_value_info *rv; | |
8069 | ||
8070 | rv = thread_fsm_return_value (tp->thread_fsm); | |
8071 | if (rv != NULL) | |
8072 | print_return_value (uiout, rv); | |
8073 | } | |
0c7e1a46 PA |
8074 | } |
8075 | ||
388a7084 PA |
8076 | /* See infrun.h. */ |
8077 | ||
8078 | void | |
8079 | maybe_remove_breakpoints (void) | |
8080 | { | |
8081 | if (!breakpoints_should_be_inserted_now () && target_has_execution) | |
8082 | { | |
8083 | if (remove_breakpoints ()) | |
8084 | { | |
223ffa71 | 8085 | target_terminal::ours_for_output (); |
388a7084 PA |
8086 | printf_filtered (_("Cannot remove breakpoints because " |
8087 | "program is no longer writable.\nFurther " | |
8088 | "execution is probably impossible.\n")); | |
8089 | } | |
8090 | } | |
8091 | } | |
8092 | ||
4c2f2a79 PA |
8093 | /* The execution context that just caused a normal stop. */ |
8094 | ||
8095 | struct stop_context | |
8096 | { | |
8097 | /* The stop ID. */ | |
8098 | ULONGEST stop_id; | |
c906108c | 8099 | |
4c2f2a79 | 8100 | /* The event PTID. */ |
c906108c | 8101 | |
4c2f2a79 PA |
8102 | ptid_t ptid; |
8103 | ||
8104 | /* If stopp for a thread event, this is the thread that caused the | |
8105 | stop. */ | |
8106 | struct thread_info *thread; | |
8107 | ||
8108 | /* The inferior that caused the stop. */ | |
8109 | int inf_num; | |
8110 | }; | |
8111 | ||
8112 | /* Returns a new stop context. If stopped for a thread event, this | |
8113 | takes a strong reference to the thread. */ | |
8114 | ||
8115 | static struct stop_context * | |
8116 | save_stop_context (void) | |
8117 | { | |
224c3ddb | 8118 | struct stop_context *sc = XNEW (struct stop_context); |
4c2f2a79 PA |
8119 | |
8120 | sc->stop_id = get_stop_id (); | |
8121 | sc->ptid = inferior_ptid; | |
8122 | sc->inf_num = current_inferior ()->num; | |
8123 | ||
8124 | if (!ptid_equal (inferior_ptid, null_ptid)) | |
8125 | { | |
8126 | /* Take a strong reference so that the thread can't be deleted | |
8127 | yet. */ | |
8128 | sc->thread = inferior_thread (); | |
803bdfe4 | 8129 | sc->thread->incref (); |
4c2f2a79 PA |
8130 | } |
8131 | else | |
8132 | sc->thread = NULL; | |
8133 | ||
8134 | return sc; | |
8135 | } | |
8136 | ||
8137 | /* Release a stop context previously created with save_stop_context. | |
8138 | Releases the strong reference to the thread as well. */ | |
8139 | ||
8140 | static void | |
8141 | release_stop_context_cleanup (void *arg) | |
8142 | { | |
9a3c8263 | 8143 | struct stop_context *sc = (struct stop_context *) arg; |
4c2f2a79 PA |
8144 | |
8145 | if (sc->thread != NULL) | |
803bdfe4 | 8146 | sc->thread->decref (); |
4c2f2a79 PA |
8147 | xfree (sc); |
8148 | } | |
8149 | ||
8150 | /* Return true if the current context no longer matches the saved stop | |
8151 | context. */ | |
8152 | ||
8153 | static int | |
8154 | stop_context_changed (struct stop_context *prev) | |
8155 | { | |
8156 | if (!ptid_equal (prev->ptid, inferior_ptid)) | |
8157 | return 1; | |
8158 | if (prev->inf_num != current_inferior ()->num) | |
8159 | return 1; | |
8160 | if (prev->thread != NULL && prev->thread->state != THREAD_STOPPED) | |
8161 | return 1; | |
8162 | if (get_stop_id () != prev->stop_id) | |
8163 | return 1; | |
8164 | return 0; | |
8165 | } | |
8166 | ||
8167 | /* See infrun.h. */ | |
8168 | ||
8169 | int | |
96baa820 | 8170 | normal_stop (void) |
c906108c | 8171 | { |
73b65bb0 DJ |
8172 | struct target_waitstatus last; |
8173 | ptid_t last_ptid; | |
29f49a6a | 8174 | struct cleanup *old_chain = make_cleanup (null_cleanup, NULL); |
e1316e60 | 8175 | ptid_t pid_ptid; |
73b65bb0 DJ |
8176 | |
8177 | get_last_target_status (&last_ptid, &last); | |
8178 | ||
4c2f2a79 PA |
8179 | new_stop_id (); |
8180 | ||
29f49a6a PA |
8181 | /* If an exception is thrown from this point on, make sure to |
8182 | propagate GDB's knowledge of the executing state to the | |
8183 | frontend/user running state. A QUIT is an easy exception to see | |
8184 | here, so do this before any filtered output. */ | |
c35b1492 PA |
8185 | if (!non_stop) |
8186 | make_cleanup (finish_thread_state_cleanup, &minus_one_ptid); | |
e1316e60 PA |
8187 | else if (last.kind == TARGET_WAITKIND_SIGNALLED |
8188 | || last.kind == TARGET_WAITKIND_EXITED) | |
8189 | { | |
8190 | /* On some targets, we may still have live threads in the | |
8191 | inferior when we get a process exit event. E.g., for | |
8192 | "checkpoint", when the current checkpoint/fork exits, | |
8193 | linux-fork.c automatically switches to another fork from | |
8194 | within target_mourn_inferior. */ | |
8195 | if (!ptid_equal (inferior_ptid, null_ptid)) | |
8196 | { | |
8197 | pid_ptid = pid_to_ptid (ptid_get_pid (inferior_ptid)); | |
8198 | make_cleanup (finish_thread_state_cleanup, &pid_ptid); | |
8199 | } | |
8200 | } | |
8201 | else if (last.kind != TARGET_WAITKIND_NO_RESUMED) | |
c35b1492 | 8202 | make_cleanup (finish_thread_state_cleanup, &inferior_ptid); |
29f49a6a | 8203 | |
b57bacec PA |
8204 | /* As we're presenting a stop, and potentially removing breakpoints, |
8205 | update the thread list so we can tell whether there are threads | |
8206 | running on the target. With target remote, for example, we can | |
8207 | only learn about new threads when we explicitly update the thread | |
8208 | list. Do this before notifying the interpreters about signal | |
8209 | stops, end of stepping ranges, etc., so that the "new thread" | |
8210 | output is emitted before e.g., "Program received signal FOO", | |
8211 | instead of after. */ | |
8212 | update_thread_list (); | |
8213 | ||
8214 | if (last.kind == TARGET_WAITKIND_STOPPED && stopped_by_random_signal) | |
8215 | observer_notify_signal_received (inferior_thread ()->suspend.stop_signal); | |
8216 | ||
c906108c SS |
8217 | /* As with the notification of thread events, we want to delay |
8218 | notifying the user that we've switched thread context until | |
8219 | the inferior actually stops. | |
8220 | ||
73b65bb0 DJ |
8221 | There's no point in saying anything if the inferior has exited. |
8222 | Note that SIGNALLED here means "exited with a signal", not | |
b65dc60b PA |
8223 | "received a signal". |
8224 | ||
8225 | Also skip saying anything in non-stop mode. In that mode, as we | |
8226 | don't want GDB to switch threads behind the user's back, to avoid | |
8227 | races where the user is typing a command to apply to thread x, | |
8228 | but GDB switches to thread y before the user finishes entering | |
8229 | the command, fetch_inferior_event installs a cleanup to restore | |
8230 | the current thread back to the thread the user had selected right | |
8231 | after this event is handled, so we're not really switching, only | |
8232 | informing of a stop. */ | |
4f8d22e3 PA |
8233 | if (!non_stop |
8234 | && !ptid_equal (previous_inferior_ptid, inferior_ptid) | |
73b65bb0 DJ |
8235 | && target_has_execution |
8236 | && last.kind != TARGET_WAITKIND_SIGNALLED | |
0e5bf2a8 PA |
8237 | && last.kind != TARGET_WAITKIND_EXITED |
8238 | && last.kind != TARGET_WAITKIND_NO_RESUMED) | |
c906108c | 8239 | { |
0e454242 | 8240 | SWITCH_THRU_ALL_UIS () |
3b12939d | 8241 | { |
223ffa71 | 8242 | target_terminal::ours_for_output (); |
3b12939d PA |
8243 | printf_filtered (_("[Switching to %s]\n"), |
8244 | target_pid_to_str (inferior_ptid)); | |
8245 | annotate_thread_changed (); | |
8246 | } | |
39f77062 | 8247 | previous_inferior_ptid = inferior_ptid; |
c906108c | 8248 | } |
c906108c | 8249 | |
0e5bf2a8 PA |
8250 | if (last.kind == TARGET_WAITKIND_NO_RESUMED) |
8251 | { | |
0e454242 | 8252 | SWITCH_THRU_ALL_UIS () |
3b12939d PA |
8253 | if (current_ui->prompt_state == PROMPT_BLOCKED) |
8254 | { | |
223ffa71 | 8255 | target_terminal::ours_for_output (); |
3b12939d PA |
8256 | printf_filtered (_("No unwaited-for children left.\n")); |
8257 | } | |
0e5bf2a8 PA |
8258 | } |
8259 | ||
b57bacec | 8260 | /* Note: this depends on the update_thread_list call above. */ |
388a7084 | 8261 | maybe_remove_breakpoints (); |
c906108c | 8262 | |
c906108c SS |
8263 | /* If an auto-display called a function and that got a signal, |
8264 | delete that auto-display to avoid an infinite recursion. */ | |
8265 | ||
8266 | if (stopped_by_random_signal) | |
8267 | disable_current_display (); | |
8268 | ||
0e454242 | 8269 | SWITCH_THRU_ALL_UIS () |
3b12939d PA |
8270 | { |
8271 | async_enable_stdin (); | |
8272 | } | |
c906108c | 8273 | |
388a7084 PA |
8274 | /* Let the user/frontend see the threads as stopped. */ |
8275 | do_cleanups (old_chain); | |
8276 | ||
8277 | /* Select innermost stack frame - i.e., current frame is frame 0, | |
8278 | and current location is based on that. Handle the case where the | |
8279 | dummy call is returning after being stopped. E.g. the dummy call | |
8280 | previously hit a breakpoint. (If the dummy call returns | |
8281 | normally, we won't reach here.) Do this before the stop hook is | |
8282 | run, so that it doesn't get to see the temporary dummy frame, | |
8283 | which is not where we'll present the stop. */ | |
8284 | if (has_stack_frames ()) | |
8285 | { | |
8286 | if (stop_stack_dummy == STOP_STACK_DUMMY) | |
8287 | { | |
8288 | /* Pop the empty frame that contains the stack dummy. This | |
8289 | also restores inferior state prior to the call (struct | |
8290 | infcall_suspend_state). */ | |
8291 | struct frame_info *frame = get_current_frame (); | |
8292 | ||
8293 | gdb_assert (get_frame_type (frame) == DUMMY_FRAME); | |
8294 | frame_pop (frame); | |
8295 | /* frame_pop calls reinit_frame_cache as the last thing it | |
8296 | does which means there's now no selected frame. */ | |
8297 | } | |
8298 | ||
8299 | select_frame (get_current_frame ()); | |
8300 | ||
8301 | /* Set the current source location. */ | |
8302 | set_current_sal_from_frame (get_current_frame ()); | |
8303 | } | |
dd7e2d2b PA |
8304 | |
8305 | /* Look up the hook_stop and run it (CLI internally handles problem | |
8306 | of stop_command's pre-hook not existing). */ | |
4c2f2a79 PA |
8307 | if (stop_command != NULL) |
8308 | { | |
8309 | struct stop_context *saved_context = save_stop_context (); | |
8310 | struct cleanup *old_chain | |
8311 | = make_cleanup (release_stop_context_cleanup, saved_context); | |
8312 | ||
bf469271 PA |
8313 | TRY |
8314 | { | |
8315 | execute_cmd_pre_hook (stop_command); | |
8316 | } | |
8317 | CATCH (ex, RETURN_MASK_ALL) | |
8318 | { | |
8319 | exception_fprintf (gdb_stderr, ex, | |
8320 | "Error while running hook_stop:\n"); | |
8321 | } | |
8322 | END_CATCH | |
4c2f2a79 PA |
8323 | |
8324 | /* If the stop hook resumes the target, then there's no point in | |
8325 | trying to notify about the previous stop; its context is | |
8326 | gone. Likewise if the command switches thread or inferior -- | |
8327 | the observers would print a stop for the wrong | |
8328 | thread/inferior. */ | |
8329 | if (stop_context_changed (saved_context)) | |
8330 | { | |
8331 | do_cleanups (old_chain); | |
8332 | return 1; | |
8333 | } | |
8334 | do_cleanups (old_chain); | |
8335 | } | |
dd7e2d2b | 8336 | |
388a7084 PA |
8337 | /* Notify observers about the stop. This is where the interpreters |
8338 | print the stop event. */ | |
8339 | if (!ptid_equal (inferior_ptid, null_ptid)) | |
8340 | observer_notify_normal_stop (inferior_thread ()->control.stop_bpstat, | |
8341 | stop_print_frame); | |
8342 | else | |
8343 | observer_notify_normal_stop (NULL, stop_print_frame); | |
347bddb7 | 8344 | |
243a9253 PA |
8345 | annotate_stopped (); |
8346 | ||
48844aa6 PA |
8347 | if (target_has_execution) |
8348 | { | |
8349 | if (last.kind != TARGET_WAITKIND_SIGNALLED | |
8350 | && last.kind != TARGET_WAITKIND_EXITED) | |
8351 | /* Delete the breakpoint we stopped at, if it wants to be deleted. | |
8352 | Delete any breakpoint that is to be deleted at the next stop. */ | |
16c381f0 | 8353 | breakpoint_auto_delete (inferior_thread ()->control.stop_bpstat); |
94cc34af | 8354 | } |
6c95b8df PA |
8355 | |
8356 | /* Try to get rid of automatically added inferiors that are no | |
8357 | longer needed. Keeping those around slows down things linearly. | |
8358 | Note that this never removes the current inferior. */ | |
8359 | prune_inferiors (); | |
4c2f2a79 PA |
8360 | |
8361 | return 0; | |
c906108c | 8362 | } |
c906108c | 8363 | \f |
c5aa993b | 8364 | int |
96baa820 | 8365 | signal_stop_state (int signo) |
c906108c | 8366 | { |
d6b48e9c | 8367 | return signal_stop[signo]; |
c906108c SS |
8368 | } |
8369 | ||
c5aa993b | 8370 | int |
96baa820 | 8371 | signal_print_state (int signo) |
c906108c SS |
8372 | { |
8373 | return signal_print[signo]; | |
8374 | } | |
8375 | ||
c5aa993b | 8376 | int |
96baa820 | 8377 | signal_pass_state (int signo) |
c906108c SS |
8378 | { |
8379 | return signal_program[signo]; | |
8380 | } | |
8381 | ||
2455069d UW |
8382 | static void |
8383 | signal_cache_update (int signo) | |
8384 | { | |
8385 | if (signo == -1) | |
8386 | { | |
a493e3e2 | 8387 | for (signo = 0; signo < (int) GDB_SIGNAL_LAST; signo++) |
2455069d UW |
8388 | signal_cache_update (signo); |
8389 | ||
8390 | return; | |
8391 | } | |
8392 | ||
8393 | signal_pass[signo] = (signal_stop[signo] == 0 | |
8394 | && signal_print[signo] == 0 | |
ab04a2af TT |
8395 | && signal_program[signo] == 1 |
8396 | && signal_catch[signo] == 0); | |
2455069d UW |
8397 | } |
8398 | ||
488f131b | 8399 | int |
7bda5e4a | 8400 | signal_stop_update (int signo, int state) |
d4f3574e SS |
8401 | { |
8402 | int ret = signal_stop[signo]; | |
abbb1732 | 8403 | |
d4f3574e | 8404 | signal_stop[signo] = state; |
2455069d | 8405 | signal_cache_update (signo); |
d4f3574e SS |
8406 | return ret; |
8407 | } | |
8408 | ||
488f131b | 8409 | int |
7bda5e4a | 8410 | signal_print_update (int signo, int state) |
d4f3574e SS |
8411 | { |
8412 | int ret = signal_print[signo]; | |
abbb1732 | 8413 | |
d4f3574e | 8414 | signal_print[signo] = state; |
2455069d | 8415 | signal_cache_update (signo); |
d4f3574e SS |
8416 | return ret; |
8417 | } | |
8418 | ||
488f131b | 8419 | int |
7bda5e4a | 8420 | signal_pass_update (int signo, int state) |
d4f3574e SS |
8421 | { |
8422 | int ret = signal_program[signo]; | |
abbb1732 | 8423 | |
d4f3574e | 8424 | signal_program[signo] = state; |
2455069d | 8425 | signal_cache_update (signo); |
d4f3574e SS |
8426 | return ret; |
8427 | } | |
8428 | ||
ab04a2af TT |
8429 | /* Update the global 'signal_catch' from INFO and notify the |
8430 | target. */ | |
8431 | ||
8432 | void | |
8433 | signal_catch_update (const unsigned int *info) | |
8434 | { | |
8435 | int i; | |
8436 | ||
8437 | for (i = 0; i < GDB_SIGNAL_LAST; ++i) | |
8438 | signal_catch[i] = info[i] > 0; | |
8439 | signal_cache_update (-1); | |
8440 | target_pass_signals ((int) GDB_SIGNAL_LAST, signal_pass); | |
8441 | } | |
8442 | ||
c906108c | 8443 | static void |
96baa820 | 8444 | sig_print_header (void) |
c906108c | 8445 | { |
3e43a32a MS |
8446 | printf_filtered (_("Signal Stop\tPrint\tPass " |
8447 | "to program\tDescription\n")); | |
c906108c SS |
8448 | } |
8449 | ||
8450 | static void | |
2ea28649 | 8451 | sig_print_info (enum gdb_signal oursig) |
c906108c | 8452 | { |
2ea28649 | 8453 | const char *name = gdb_signal_to_name (oursig); |
c906108c | 8454 | int name_padding = 13 - strlen (name); |
96baa820 | 8455 | |
c906108c SS |
8456 | if (name_padding <= 0) |
8457 | name_padding = 0; | |
8458 | ||
8459 | printf_filtered ("%s", name); | |
488f131b | 8460 | printf_filtered ("%*.*s ", name_padding, name_padding, " "); |
c906108c SS |
8461 | printf_filtered ("%s\t", signal_stop[oursig] ? "Yes" : "No"); |
8462 | printf_filtered ("%s\t", signal_print[oursig] ? "Yes" : "No"); | |
8463 | printf_filtered ("%s\t\t", signal_program[oursig] ? "Yes" : "No"); | |
2ea28649 | 8464 | printf_filtered ("%s\n", gdb_signal_to_string (oursig)); |
c906108c SS |
8465 | } |
8466 | ||
8467 | /* Specify how various signals in the inferior should be handled. */ | |
8468 | ||
8469 | static void | |
96baa820 | 8470 | handle_command (char *args, int from_tty) |
c906108c | 8471 | { |
c906108c SS |
8472 | int digits, wordlen; |
8473 | int sigfirst, signum, siglast; | |
2ea28649 | 8474 | enum gdb_signal oursig; |
c906108c SS |
8475 | int allsigs; |
8476 | int nsigs; | |
8477 | unsigned char *sigs; | |
c906108c SS |
8478 | |
8479 | if (args == NULL) | |
8480 | { | |
e2e0b3e5 | 8481 | error_no_arg (_("signal to handle")); |
c906108c SS |
8482 | } |
8483 | ||
1777feb0 | 8484 | /* Allocate and zero an array of flags for which signals to handle. */ |
c906108c | 8485 | |
a493e3e2 | 8486 | nsigs = (int) GDB_SIGNAL_LAST; |
c906108c SS |
8487 | sigs = (unsigned char *) alloca (nsigs); |
8488 | memset (sigs, 0, nsigs); | |
8489 | ||
1777feb0 | 8490 | /* Break the command line up into args. */ |
c906108c | 8491 | |
773a1edc | 8492 | gdb_argv built_argv (args); |
c906108c SS |
8493 | |
8494 | /* Walk through the args, looking for signal oursigs, signal names, and | |
8495 | actions. Signal numbers and signal names may be interspersed with | |
8496 | actions, with the actions being performed for all signals cumulatively | |
1777feb0 | 8497 | specified. Signal ranges can be specified as <LOW>-<HIGH>. */ |
c906108c | 8498 | |
773a1edc | 8499 | for (char *arg : built_argv) |
c906108c | 8500 | { |
773a1edc TT |
8501 | wordlen = strlen (arg); |
8502 | for (digits = 0; isdigit (arg[digits]); digits++) | |
c906108c SS |
8503 | {; |
8504 | } | |
8505 | allsigs = 0; | |
8506 | sigfirst = siglast = -1; | |
8507 | ||
773a1edc | 8508 | if (wordlen >= 1 && !strncmp (arg, "all", wordlen)) |
c906108c SS |
8509 | { |
8510 | /* Apply action to all signals except those used by the | |
1777feb0 | 8511 | debugger. Silently skip those. */ |
c906108c SS |
8512 | allsigs = 1; |
8513 | sigfirst = 0; | |
8514 | siglast = nsigs - 1; | |
8515 | } | |
773a1edc | 8516 | else if (wordlen >= 1 && !strncmp (arg, "stop", wordlen)) |
c906108c SS |
8517 | { |
8518 | SET_SIGS (nsigs, sigs, signal_stop); | |
8519 | SET_SIGS (nsigs, sigs, signal_print); | |
8520 | } | |
773a1edc | 8521 | else if (wordlen >= 1 && !strncmp (arg, "ignore", wordlen)) |
c906108c SS |
8522 | { |
8523 | UNSET_SIGS (nsigs, sigs, signal_program); | |
8524 | } | |
773a1edc | 8525 | else if (wordlen >= 2 && !strncmp (arg, "print", wordlen)) |
c906108c SS |
8526 | { |
8527 | SET_SIGS (nsigs, sigs, signal_print); | |
8528 | } | |
773a1edc | 8529 | else if (wordlen >= 2 && !strncmp (arg, "pass", wordlen)) |
c906108c SS |
8530 | { |
8531 | SET_SIGS (nsigs, sigs, signal_program); | |
8532 | } | |
773a1edc | 8533 | else if (wordlen >= 3 && !strncmp (arg, "nostop", wordlen)) |
c906108c SS |
8534 | { |
8535 | UNSET_SIGS (nsigs, sigs, signal_stop); | |
8536 | } | |
773a1edc | 8537 | else if (wordlen >= 3 && !strncmp (arg, "noignore", wordlen)) |
c906108c SS |
8538 | { |
8539 | SET_SIGS (nsigs, sigs, signal_program); | |
8540 | } | |
773a1edc | 8541 | else if (wordlen >= 4 && !strncmp (arg, "noprint", wordlen)) |
c906108c SS |
8542 | { |
8543 | UNSET_SIGS (nsigs, sigs, signal_print); | |
8544 | UNSET_SIGS (nsigs, sigs, signal_stop); | |
8545 | } | |
773a1edc | 8546 | else if (wordlen >= 4 && !strncmp (arg, "nopass", wordlen)) |
c906108c SS |
8547 | { |
8548 | UNSET_SIGS (nsigs, sigs, signal_program); | |
8549 | } | |
8550 | else if (digits > 0) | |
8551 | { | |
8552 | /* It is numeric. The numeric signal refers to our own | |
8553 | internal signal numbering from target.h, not to host/target | |
8554 | signal number. This is a feature; users really should be | |
8555 | using symbolic names anyway, and the common ones like | |
8556 | SIGHUP, SIGINT, SIGALRM, etc. will work right anyway. */ | |
8557 | ||
8558 | sigfirst = siglast = (int) | |
773a1edc TT |
8559 | gdb_signal_from_command (atoi (arg)); |
8560 | if (arg[digits] == '-') | |
c906108c SS |
8561 | { |
8562 | siglast = (int) | |
773a1edc | 8563 | gdb_signal_from_command (atoi (arg + digits + 1)); |
c906108c SS |
8564 | } |
8565 | if (sigfirst > siglast) | |
8566 | { | |
1777feb0 | 8567 | /* Bet he didn't figure we'd think of this case... */ |
c906108c SS |
8568 | signum = sigfirst; |
8569 | sigfirst = siglast; | |
8570 | siglast = signum; | |
8571 | } | |
8572 | } | |
8573 | else | |
8574 | { | |
773a1edc | 8575 | oursig = gdb_signal_from_name (arg); |
a493e3e2 | 8576 | if (oursig != GDB_SIGNAL_UNKNOWN) |
c906108c SS |
8577 | { |
8578 | sigfirst = siglast = (int) oursig; | |
8579 | } | |
8580 | else | |
8581 | { | |
8582 | /* Not a number and not a recognized flag word => complain. */ | |
773a1edc | 8583 | error (_("Unrecognized or ambiguous flag word: \"%s\"."), arg); |
c906108c SS |
8584 | } |
8585 | } | |
8586 | ||
8587 | /* If any signal numbers or symbol names were found, set flags for | |
1777feb0 | 8588 | which signals to apply actions to. */ |
c906108c SS |
8589 | |
8590 | for (signum = sigfirst; signum >= 0 && signum <= siglast; signum++) | |
8591 | { | |
2ea28649 | 8592 | switch ((enum gdb_signal) signum) |
c906108c | 8593 | { |
a493e3e2 PA |
8594 | case GDB_SIGNAL_TRAP: |
8595 | case GDB_SIGNAL_INT: | |
c906108c SS |
8596 | if (!allsigs && !sigs[signum]) |
8597 | { | |
9e2f0ad4 | 8598 | if (query (_("%s is used by the debugger.\n\ |
3e43a32a | 8599 | Are you sure you want to change it? "), |
2ea28649 | 8600 | gdb_signal_to_name ((enum gdb_signal) signum))) |
c906108c SS |
8601 | { |
8602 | sigs[signum] = 1; | |
8603 | } | |
8604 | else | |
8605 | { | |
a3f17187 | 8606 | printf_unfiltered (_("Not confirmed, unchanged.\n")); |
c906108c SS |
8607 | gdb_flush (gdb_stdout); |
8608 | } | |
8609 | } | |
8610 | break; | |
a493e3e2 PA |
8611 | case GDB_SIGNAL_0: |
8612 | case GDB_SIGNAL_DEFAULT: | |
8613 | case GDB_SIGNAL_UNKNOWN: | |
c906108c SS |
8614 | /* Make sure that "all" doesn't print these. */ |
8615 | break; | |
8616 | default: | |
8617 | sigs[signum] = 1; | |
8618 | break; | |
8619 | } | |
8620 | } | |
c906108c SS |
8621 | } |
8622 | ||
3a031f65 PA |
8623 | for (signum = 0; signum < nsigs; signum++) |
8624 | if (sigs[signum]) | |
8625 | { | |
2455069d | 8626 | signal_cache_update (-1); |
a493e3e2 PA |
8627 | target_pass_signals ((int) GDB_SIGNAL_LAST, signal_pass); |
8628 | target_program_signals ((int) GDB_SIGNAL_LAST, signal_program); | |
c906108c | 8629 | |
3a031f65 PA |
8630 | if (from_tty) |
8631 | { | |
8632 | /* Show the results. */ | |
8633 | sig_print_header (); | |
8634 | for (; signum < nsigs; signum++) | |
8635 | if (sigs[signum]) | |
aead7601 | 8636 | sig_print_info ((enum gdb_signal) signum); |
3a031f65 PA |
8637 | } |
8638 | ||
8639 | break; | |
8640 | } | |
c906108c SS |
8641 | } |
8642 | ||
de0bea00 MF |
8643 | /* Complete the "handle" command. */ |
8644 | ||
eb3ff9a5 | 8645 | static void |
de0bea00 | 8646 | handle_completer (struct cmd_list_element *ignore, |
eb3ff9a5 | 8647 | completion_tracker &tracker, |
6f937416 | 8648 | const char *text, const char *word) |
de0bea00 | 8649 | { |
de0bea00 MF |
8650 | static const char * const keywords[] = |
8651 | { | |
8652 | "all", | |
8653 | "stop", | |
8654 | "ignore", | |
8655 | "print", | |
8656 | "pass", | |
8657 | "nostop", | |
8658 | "noignore", | |
8659 | "noprint", | |
8660 | "nopass", | |
8661 | NULL, | |
8662 | }; | |
8663 | ||
eb3ff9a5 PA |
8664 | signal_completer (ignore, tracker, text, word); |
8665 | complete_on_enum (tracker, keywords, word, word); | |
de0bea00 MF |
8666 | } |
8667 | ||
2ea28649 PA |
8668 | enum gdb_signal |
8669 | gdb_signal_from_command (int num) | |
ed01b82c PA |
8670 | { |
8671 | if (num >= 1 && num <= 15) | |
2ea28649 | 8672 | return (enum gdb_signal) num; |
ed01b82c PA |
8673 | error (_("Only signals 1-15 are valid as numeric signals.\n\ |
8674 | Use \"info signals\" for a list of symbolic signals.")); | |
8675 | } | |
8676 | ||
c906108c SS |
8677 | /* Print current contents of the tables set by the handle command. |
8678 | It is possible we should just be printing signals actually used | |
8679 | by the current target (but for things to work right when switching | |
8680 | targets, all signals should be in the signal tables). */ | |
8681 | ||
8682 | static void | |
11db9430 | 8683 | info_signals_command (char *signum_exp, int from_tty) |
c906108c | 8684 | { |
2ea28649 | 8685 | enum gdb_signal oursig; |
abbb1732 | 8686 | |
c906108c SS |
8687 | sig_print_header (); |
8688 | ||
8689 | if (signum_exp) | |
8690 | { | |
8691 | /* First see if this is a symbol name. */ | |
2ea28649 | 8692 | oursig = gdb_signal_from_name (signum_exp); |
a493e3e2 | 8693 | if (oursig == GDB_SIGNAL_UNKNOWN) |
c906108c SS |
8694 | { |
8695 | /* No, try numeric. */ | |
8696 | oursig = | |
2ea28649 | 8697 | gdb_signal_from_command (parse_and_eval_long (signum_exp)); |
c906108c SS |
8698 | } |
8699 | sig_print_info (oursig); | |
8700 | return; | |
8701 | } | |
8702 | ||
8703 | printf_filtered ("\n"); | |
8704 | /* These ugly casts brought to you by the native VAX compiler. */ | |
a493e3e2 PA |
8705 | for (oursig = GDB_SIGNAL_FIRST; |
8706 | (int) oursig < (int) GDB_SIGNAL_LAST; | |
2ea28649 | 8707 | oursig = (enum gdb_signal) ((int) oursig + 1)) |
c906108c SS |
8708 | { |
8709 | QUIT; | |
8710 | ||
a493e3e2 PA |
8711 | if (oursig != GDB_SIGNAL_UNKNOWN |
8712 | && oursig != GDB_SIGNAL_DEFAULT && oursig != GDB_SIGNAL_0) | |
c906108c SS |
8713 | sig_print_info (oursig); |
8714 | } | |
8715 | ||
3e43a32a MS |
8716 | printf_filtered (_("\nUse the \"handle\" command " |
8717 | "to change these tables.\n")); | |
c906108c | 8718 | } |
4aa995e1 PA |
8719 | |
8720 | /* The $_siginfo convenience variable is a bit special. We don't know | |
8721 | for sure the type of the value until we actually have a chance to | |
7a9dd1b2 | 8722 | fetch the data. The type can change depending on gdbarch, so it is |
4aa995e1 PA |
8723 | also dependent on which thread you have selected. |
8724 | ||
8725 | 1. making $_siginfo be an internalvar that creates a new value on | |
8726 | access. | |
8727 | ||
8728 | 2. making the value of $_siginfo be an lval_computed value. */ | |
8729 | ||
8730 | /* This function implements the lval_computed support for reading a | |
8731 | $_siginfo value. */ | |
8732 | ||
8733 | static void | |
8734 | siginfo_value_read (struct value *v) | |
8735 | { | |
8736 | LONGEST transferred; | |
8737 | ||
a911d87a PA |
8738 | /* If we can access registers, so can we access $_siginfo. Likewise |
8739 | vice versa. */ | |
8740 | validate_registers_access (); | |
c709acd1 | 8741 | |
4aa995e1 PA |
8742 | transferred = |
8743 | target_read (¤t_target, TARGET_OBJECT_SIGNAL_INFO, | |
8744 | NULL, | |
8745 | value_contents_all_raw (v), | |
8746 | value_offset (v), | |
8747 | TYPE_LENGTH (value_type (v))); | |
8748 | ||
8749 | if (transferred != TYPE_LENGTH (value_type (v))) | |
8750 | error (_("Unable to read siginfo")); | |
8751 | } | |
8752 | ||
8753 | /* This function implements the lval_computed support for writing a | |
8754 | $_siginfo value. */ | |
8755 | ||
8756 | static void | |
8757 | siginfo_value_write (struct value *v, struct value *fromval) | |
8758 | { | |
8759 | LONGEST transferred; | |
8760 | ||
a911d87a PA |
8761 | /* If we can access registers, so can we access $_siginfo. Likewise |
8762 | vice versa. */ | |
8763 | validate_registers_access (); | |
c709acd1 | 8764 | |
4aa995e1 PA |
8765 | transferred = target_write (¤t_target, |
8766 | TARGET_OBJECT_SIGNAL_INFO, | |
8767 | NULL, | |
8768 | value_contents_all_raw (fromval), | |
8769 | value_offset (v), | |
8770 | TYPE_LENGTH (value_type (fromval))); | |
8771 | ||
8772 | if (transferred != TYPE_LENGTH (value_type (fromval))) | |
8773 | error (_("Unable to write siginfo")); | |
8774 | } | |
8775 | ||
c8f2448a | 8776 | static const struct lval_funcs siginfo_value_funcs = |
4aa995e1 PA |
8777 | { |
8778 | siginfo_value_read, | |
8779 | siginfo_value_write | |
8780 | }; | |
8781 | ||
8782 | /* Return a new value with the correct type for the siginfo object of | |
78267919 UW |
8783 | the current thread using architecture GDBARCH. Return a void value |
8784 | if there's no object available. */ | |
4aa995e1 | 8785 | |
2c0b251b | 8786 | static struct value * |
22d2b532 SDJ |
8787 | siginfo_make_value (struct gdbarch *gdbarch, struct internalvar *var, |
8788 | void *ignore) | |
4aa995e1 | 8789 | { |
4aa995e1 | 8790 | if (target_has_stack |
78267919 UW |
8791 | && !ptid_equal (inferior_ptid, null_ptid) |
8792 | && gdbarch_get_siginfo_type_p (gdbarch)) | |
4aa995e1 | 8793 | { |
78267919 | 8794 | struct type *type = gdbarch_get_siginfo_type (gdbarch); |
abbb1732 | 8795 | |
78267919 | 8796 | return allocate_computed_value (type, &siginfo_value_funcs, NULL); |
4aa995e1 PA |
8797 | } |
8798 | ||
78267919 | 8799 | return allocate_value (builtin_type (gdbarch)->builtin_void); |
4aa995e1 PA |
8800 | } |
8801 | ||
c906108c | 8802 | \f |
16c381f0 JK |
8803 | /* infcall_suspend_state contains state about the program itself like its |
8804 | registers and any signal it received when it last stopped. | |
8805 | This state must be restored regardless of how the inferior function call | |
8806 | ends (either successfully, or after it hits a breakpoint or signal) | |
8807 | if the program is to properly continue where it left off. */ | |
8808 | ||
8809 | struct infcall_suspend_state | |
7a292a7a | 8810 | { |
16c381f0 | 8811 | struct thread_suspend_state thread_suspend; |
16c381f0 JK |
8812 | |
8813 | /* Other fields: */ | |
7a292a7a | 8814 | CORE_ADDR stop_pc; |
b89667eb | 8815 | struct regcache *registers; |
1736ad11 | 8816 | |
35515841 | 8817 | /* Format of SIGINFO_DATA or NULL if it is not present. */ |
1736ad11 JK |
8818 | struct gdbarch *siginfo_gdbarch; |
8819 | ||
8820 | /* The inferior format depends on SIGINFO_GDBARCH and it has a length of | |
8821 | TYPE_LENGTH (gdbarch_get_siginfo_type ()). For different gdbarch the | |
8822 | content would be invalid. */ | |
8823 | gdb_byte *siginfo_data; | |
b89667eb DE |
8824 | }; |
8825 | ||
16c381f0 JK |
8826 | struct infcall_suspend_state * |
8827 | save_infcall_suspend_state (void) | |
b89667eb | 8828 | { |
16c381f0 | 8829 | struct infcall_suspend_state *inf_state; |
b89667eb | 8830 | struct thread_info *tp = inferior_thread (); |
1736ad11 JK |
8831 | struct regcache *regcache = get_current_regcache (); |
8832 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
8833 | gdb_byte *siginfo_data = NULL; | |
8834 | ||
8835 | if (gdbarch_get_siginfo_type_p (gdbarch)) | |
8836 | { | |
8837 | struct type *type = gdbarch_get_siginfo_type (gdbarch); | |
8838 | size_t len = TYPE_LENGTH (type); | |
8839 | struct cleanup *back_to; | |
8840 | ||
224c3ddb | 8841 | siginfo_data = (gdb_byte *) xmalloc (len); |
1736ad11 JK |
8842 | back_to = make_cleanup (xfree, siginfo_data); |
8843 | ||
8844 | if (target_read (¤t_target, TARGET_OBJECT_SIGNAL_INFO, NULL, | |
8845 | siginfo_data, 0, len) == len) | |
8846 | discard_cleanups (back_to); | |
8847 | else | |
8848 | { | |
8849 | /* Errors ignored. */ | |
8850 | do_cleanups (back_to); | |
8851 | siginfo_data = NULL; | |
8852 | } | |
8853 | } | |
8854 | ||
41bf6aca | 8855 | inf_state = XCNEW (struct infcall_suspend_state); |
1736ad11 JK |
8856 | |
8857 | if (siginfo_data) | |
8858 | { | |
8859 | inf_state->siginfo_gdbarch = gdbarch; | |
8860 | inf_state->siginfo_data = siginfo_data; | |
8861 | } | |
b89667eb | 8862 | |
16c381f0 | 8863 | inf_state->thread_suspend = tp->suspend; |
16c381f0 | 8864 | |
35515841 | 8865 | /* run_inferior_call will not use the signal due to its `proceed' call with |
a493e3e2 PA |
8866 | GDB_SIGNAL_0 anyway. */ |
8867 | tp->suspend.stop_signal = GDB_SIGNAL_0; | |
35515841 | 8868 | |
b89667eb DE |
8869 | inf_state->stop_pc = stop_pc; |
8870 | ||
1736ad11 | 8871 | inf_state->registers = regcache_dup (regcache); |
b89667eb DE |
8872 | |
8873 | return inf_state; | |
8874 | } | |
8875 | ||
8876 | /* Restore inferior session state to INF_STATE. */ | |
8877 | ||
8878 | void | |
16c381f0 | 8879 | restore_infcall_suspend_state (struct infcall_suspend_state *inf_state) |
b89667eb DE |
8880 | { |
8881 | struct thread_info *tp = inferior_thread (); | |
1736ad11 JK |
8882 | struct regcache *regcache = get_current_regcache (); |
8883 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
b89667eb | 8884 | |
16c381f0 | 8885 | tp->suspend = inf_state->thread_suspend; |
16c381f0 | 8886 | |
b89667eb DE |
8887 | stop_pc = inf_state->stop_pc; |
8888 | ||
1736ad11 JK |
8889 | if (inf_state->siginfo_gdbarch == gdbarch) |
8890 | { | |
8891 | struct type *type = gdbarch_get_siginfo_type (gdbarch); | |
1736ad11 JK |
8892 | |
8893 | /* Errors ignored. */ | |
8894 | target_write (¤t_target, TARGET_OBJECT_SIGNAL_INFO, NULL, | |
6acef6cd | 8895 | inf_state->siginfo_data, 0, TYPE_LENGTH (type)); |
1736ad11 JK |
8896 | } |
8897 | ||
b89667eb DE |
8898 | /* The inferior can be gone if the user types "print exit(0)" |
8899 | (and perhaps other times). */ | |
8900 | if (target_has_execution) | |
8901 | /* NB: The register write goes through to the target. */ | |
1736ad11 | 8902 | regcache_cpy (regcache, inf_state->registers); |
803b5f95 | 8903 | |
16c381f0 | 8904 | discard_infcall_suspend_state (inf_state); |
b89667eb DE |
8905 | } |
8906 | ||
8907 | static void | |
16c381f0 | 8908 | do_restore_infcall_suspend_state_cleanup (void *state) |
b89667eb | 8909 | { |
9a3c8263 | 8910 | restore_infcall_suspend_state ((struct infcall_suspend_state *) state); |
b89667eb DE |
8911 | } |
8912 | ||
8913 | struct cleanup * | |
16c381f0 JK |
8914 | make_cleanup_restore_infcall_suspend_state |
8915 | (struct infcall_suspend_state *inf_state) | |
b89667eb | 8916 | { |
16c381f0 | 8917 | return make_cleanup (do_restore_infcall_suspend_state_cleanup, inf_state); |
b89667eb DE |
8918 | } |
8919 | ||
8920 | void | |
16c381f0 | 8921 | discard_infcall_suspend_state (struct infcall_suspend_state *inf_state) |
b89667eb | 8922 | { |
c0e383c6 | 8923 | delete inf_state->registers; |
803b5f95 | 8924 | xfree (inf_state->siginfo_data); |
b89667eb DE |
8925 | xfree (inf_state); |
8926 | } | |
8927 | ||
8928 | struct regcache * | |
16c381f0 | 8929 | get_infcall_suspend_state_regcache (struct infcall_suspend_state *inf_state) |
b89667eb DE |
8930 | { |
8931 | return inf_state->registers; | |
8932 | } | |
8933 | ||
16c381f0 JK |
8934 | /* infcall_control_state contains state regarding gdb's control of the |
8935 | inferior itself like stepping control. It also contains session state like | |
8936 | the user's currently selected frame. */ | |
b89667eb | 8937 | |
16c381f0 | 8938 | struct infcall_control_state |
b89667eb | 8939 | { |
16c381f0 JK |
8940 | struct thread_control_state thread_control; |
8941 | struct inferior_control_state inferior_control; | |
d82142e2 JK |
8942 | |
8943 | /* Other fields: */ | |
8944 | enum stop_stack_kind stop_stack_dummy; | |
8945 | int stopped_by_random_signal; | |
7a292a7a | 8946 | |
b89667eb | 8947 | /* ID if the selected frame when the inferior function call was made. */ |
101dcfbe | 8948 | struct frame_id selected_frame_id; |
7a292a7a SS |
8949 | }; |
8950 | ||
c906108c | 8951 | /* Save all of the information associated with the inferior<==>gdb |
b89667eb | 8952 | connection. */ |
c906108c | 8953 | |
16c381f0 JK |
8954 | struct infcall_control_state * |
8955 | save_infcall_control_state (void) | |
c906108c | 8956 | { |
8d749320 SM |
8957 | struct infcall_control_state *inf_status = |
8958 | XNEW (struct infcall_control_state); | |
4e1c45ea | 8959 | struct thread_info *tp = inferior_thread (); |
d6b48e9c | 8960 | struct inferior *inf = current_inferior (); |
7a292a7a | 8961 | |
16c381f0 JK |
8962 | inf_status->thread_control = tp->control; |
8963 | inf_status->inferior_control = inf->control; | |
d82142e2 | 8964 | |
8358c15c | 8965 | tp->control.step_resume_breakpoint = NULL; |
5b79abe7 | 8966 | tp->control.exception_resume_breakpoint = NULL; |
8358c15c | 8967 | |
16c381f0 JK |
8968 | /* Save original bpstat chain to INF_STATUS; replace it in TP with copy of |
8969 | chain. If caller's caller is walking the chain, they'll be happier if we | |
8970 | hand them back the original chain when restore_infcall_control_state is | |
8971 | called. */ | |
8972 | tp->control.stop_bpstat = bpstat_copy (tp->control.stop_bpstat); | |
d82142e2 JK |
8973 | |
8974 | /* Other fields: */ | |
8975 | inf_status->stop_stack_dummy = stop_stack_dummy; | |
8976 | inf_status->stopped_by_random_signal = stopped_by_random_signal; | |
c5aa993b | 8977 | |
206415a3 | 8978 | inf_status->selected_frame_id = get_frame_id (get_selected_frame (NULL)); |
b89667eb | 8979 | |
7a292a7a | 8980 | return inf_status; |
c906108c SS |
8981 | } |
8982 | ||
bf469271 PA |
8983 | static void |
8984 | restore_selected_frame (const frame_id &fid) | |
c906108c | 8985 | { |
bf469271 | 8986 | frame_info *frame = frame_find_by_id (fid); |
c906108c | 8987 | |
aa0cd9c1 AC |
8988 | /* If inf_status->selected_frame_id is NULL, there was no previously |
8989 | selected frame. */ | |
101dcfbe | 8990 | if (frame == NULL) |
c906108c | 8991 | { |
8a3fe4f8 | 8992 | warning (_("Unable to restore previously selected frame.")); |
bf469271 | 8993 | return; |
c906108c SS |
8994 | } |
8995 | ||
0f7d239c | 8996 | select_frame (frame); |
c906108c SS |
8997 | } |
8998 | ||
b89667eb DE |
8999 | /* Restore inferior session state to INF_STATUS. */ |
9000 | ||
c906108c | 9001 | void |
16c381f0 | 9002 | restore_infcall_control_state (struct infcall_control_state *inf_status) |
c906108c | 9003 | { |
4e1c45ea | 9004 | struct thread_info *tp = inferior_thread (); |
d6b48e9c | 9005 | struct inferior *inf = current_inferior (); |
4e1c45ea | 9006 | |
8358c15c JK |
9007 | if (tp->control.step_resume_breakpoint) |
9008 | tp->control.step_resume_breakpoint->disposition = disp_del_at_next_stop; | |
9009 | ||
5b79abe7 TT |
9010 | if (tp->control.exception_resume_breakpoint) |
9011 | tp->control.exception_resume_breakpoint->disposition | |
9012 | = disp_del_at_next_stop; | |
9013 | ||
d82142e2 | 9014 | /* Handle the bpstat_copy of the chain. */ |
16c381f0 | 9015 | bpstat_clear (&tp->control.stop_bpstat); |
d82142e2 | 9016 | |
16c381f0 JK |
9017 | tp->control = inf_status->thread_control; |
9018 | inf->control = inf_status->inferior_control; | |
d82142e2 JK |
9019 | |
9020 | /* Other fields: */ | |
9021 | stop_stack_dummy = inf_status->stop_stack_dummy; | |
9022 | stopped_by_random_signal = inf_status->stopped_by_random_signal; | |
c906108c | 9023 | |
b89667eb | 9024 | if (target_has_stack) |
c906108c | 9025 | { |
bf469271 | 9026 | /* The point of the try/catch is that if the stack is clobbered, |
101dcfbe AC |
9027 | walking the stack might encounter a garbage pointer and |
9028 | error() trying to dereference it. */ | |
bf469271 PA |
9029 | TRY |
9030 | { | |
9031 | restore_selected_frame (inf_status->selected_frame_id); | |
9032 | } | |
9033 | CATCH (ex, RETURN_MASK_ERROR) | |
9034 | { | |
9035 | exception_fprintf (gdb_stderr, ex, | |
9036 | "Unable to restore previously selected frame:\n"); | |
9037 | /* Error in restoring the selected frame. Select the | |
9038 | innermost frame. */ | |
9039 | select_frame (get_current_frame ()); | |
9040 | } | |
9041 | END_CATCH | |
c906108c | 9042 | } |
c906108c | 9043 | |
72cec141 | 9044 | xfree (inf_status); |
7a292a7a | 9045 | } |
c906108c | 9046 | |
74b7792f | 9047 | static void |
16c381f0 | 9048 | do_restore_infcall_control_state_cleanup (void *sts) |
74b7792f | 9049 | { |
9a3c8263 | 9050 | restore_infcall_control_state ((struct infcall_control_state *) sts); |
74b7792f AC |
9051 | } |
9052 | ||
9053 | struct cleanup * | |
16c381f0 JK |
9054 | make_cleanup_restore_infcall_control_state |
9055 | (struct infcall_control_state *inf_status) | |
74b7792f | 9056 | { |
16c381f0 | 9057 | return make_cleanup (do_restore_infcall_control_state_cleanup, inf_status); |
74b7792f AC |
9058 | } |
9059 | ||
c906108c | 9060 | void |
16c381f0 | 9061 | discard_infcall_control_state (struct infcall_control_state *inf_status) |
7a292a7a | 9062 | { |
8358c15c JK |
9063 | if (inf_status->thread_control.step_resume_breakpoint) |
9064 | inf_status->thread_control.step_resume_breakpoint->disposition | |
9065 | = disp_del_at_next_stop; | |
9066 | ||
5b79abe7 TT |
9067 | if (inf_status->thread_control.exception_resume_breakpoint) |
9068 | inf_status->thread_control.exception_resume_breakpoint->disposition | |
9069 | = disp_del_at_next_stop; | |
9070 | ||
1777feb0 | 9071 | /* See save_infcall_control_state for info on stop_bpstat. */ |
16c381f0 | 9072 | bpstat_clear (&inf_status->thread_control.stop_bpstat); |
8358c15c | 9073 | |
72cec141 | 9074 | xfree (inf_status); |
7a292a7a | 9075 | } |
b89667eb | 9076 | \f |
7f89fd65 | 9077 | /* See infrun.h. */ |
0c557179 SDJ |
9078 | |
9079 | void | |
9080 | clear_exit_convenience_vars (void) | |
9081 | { | |
9082 | clear_internalvar (lookup_internalvar ("_exitsignal")); | |
9083 | clear_internalvar (lookup_internalvar ("_exitcode")); | |
9084 | } | |
c5aa993b | 9085 | \f |
488f131b | 9086 | |
b2175913 MS |
9087 | /* User interface for reverse debugging: |
9088 | Set exec-direction / show exec-direction commands | |
9089 | (returns error unless target implements to_set_exec_direction method). */ | |
9090 | ||
170742de | 9091 | enum exec_direction_kind execution_direction = EXEC_FORWARD; |
b2175913 MS |
9092 | static const char exec_forward[] = "forward"; |
9093 | static const char exec_reverse[] = "reverse"; | |
9094 | static const char *exec_direction = exec_forward; | |
40478521 | 9095 | static const char *const exec_direction_names[] = { |
b2175913 MS |
9096 | exec_forward, |
9097 | exec_reverse, | |
9098 | NULL | |
9099 | }; | |
9100 | ||
9101 | static void | |
9102 | set_exec_direction_func (char *args, int from_tty, | |
9103 | struct cmd_list_element *cmd) | |
9104 | { | |
9105 | if (target_can_execute_reverse) | |
9106 | { | |
9107 | if (!strcmp (exec_direction, exec_forward)) | |
9108 | execution_direction = EXEC_FORWARD; | |
9109 | else if (!strcmp (exec_direction, exec_reverse)) | |
9110 | execution_direction = EXEC_REVERSE; | |
9111 | } | |
8bbed405 MS |
9112 | else |
9113 | { | |
9114 | exec_direction = exec_forward; | |
9115 | error (_("Target does not support this operation.")); | |
9116 | } | |
b2175913 MS |
9117 | } |
9118 | ||
9119 | static void | |
9120 | show_exec_direction_func (struct ui_file *out, int from_tty, | |
9121 | struct cmd_list_element *cmd, const char *value) | |
9122 | { | |
9123 | switch (execution_direction) { | |
9124 | case EXEC_FORWARD: | |
9125 | fprintf_filtered (out, _("Forward.\n")); | |
9126 | break; | |
9127 | case EXEC_REVERSE: | |
9128 | fprintf_filtered (out, _("Reverse.\n")); | |
9129 | break; | |
b2175913 | 9130 | default: |
d8b34453 PA |
9131 | internal_error (__FILE__, __LINE__, |
9132 | _("bogus execution_direction value: %d"), | |
9133 | (int) execution_direction); | |
b2175913 MS |
9134 | } |
9135 | } | |
9136 | ||
d4db2f36 PA |
9137 | static void |
9138 | show_schedule_multiple (struct ui_file *file, int from_tty, | |
9139 | struct cmd_list_element *c, const char *value) | |
9140 | { | |
3e43a32a MS |
9141 | fprintf_filtered (file, _("Resuming the execution of threads " |
9142 | "of all processes is %s.\n"), value); | |
d4db2f36 | 9143 | } |
ad52ddc6 | 9144 | |
22d2b532 SDJ |
9145 | /* Implementation of `siginfo' variable. */ |
9146 | ||
9147 | static const struct internalvar_funcs siginfo_funcs = | |
9148 | { | |
9149 | siginfo_make_value, | |
9150 | NULL, | |
9151 | NULL | |
9152 | }; | |
9153 | ||
372316f1 PA |
9154 | /* Callback for infrun's target events source. This is marked when a |
9155 | thread has a pending status to process. */ | |
9156 | ||
9157 | static void | |
9158 | infrun_async_inferior_event_handler (gdb_client_data data) | |
9159 | { | |
372316f1 PA |
9160 | inferior_event_handler (INF_REG_EVENT, NULL); |
9161 | } | |
9162 | ||
c906108c | 9163 | void |
96baa820 | 9164 | _initialize_infrun (void) |
c906108c | 9165 | { |
52f0bd74 AC |
9166 | int i; |
9167 | int numsigs; | |
de0bea00 | 9168 | struct cmd_list_element *c; |
c906108c | 9169 | |
372316f1 PA |
9170 | /* Register extra event sources in the event loop. */ |
9171 | infrun_async_inferior_event_token | |
9172 | = create_async_event_handler (infrun_async_inferior_event_handler, NULL); | |
9173 | ||
11db9430 | 9174 | add_info ("signals", info_signals_command, _("\ |
1bedd215 AC |
9175 | What debugger does when program gets various signals.\n\ |
9176 | Specify a signal as argument to print info on that signal only.")); | |
c906108c SS |
9177 | add_info_alias ("handle", "signals", 0); |
9178 | ||
de0bea00 | 9179 | c = add_com ("handle", class_run, handle_command, _("\ |
dfbd5e7b | 9180 | Specify how to handle signals.\n\ |
486c7739 | 9181 | Usage: handle SIGNAL [ACTIONS]\n\ |
c906108c | 9182 | Args are signals and actions to apply to those signals.\n\ |
dfbd5e7b | 9183 | If no actions are specified, the current settings for the specified signals\n\ |
486c7739 MF |
9184 | will be displayed instead.\n\ |
9185 | \n\ | |
c906108c SS |
9186 | Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\ |
9187 | from 1-15 are allowed for compatibility with old versions of GDB.\n\ | |
9188 | Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\ | |
9189 | The special arg \"all\" is recognized to mean all signals except those\n\ | |
1bedd215 | 9190 | used by the debugger, typically SIGTRAP and SIGINT.\n\ |
486c7739 | 9191 | \n\ |
1bedd215 | 9192 | Recognized actions include \"stop\", \"nostop\", \"print\", \"noprint\",\n\ |
c906108c SS |
9193 | \"pass\", \"nopass\", \"ignore\", or \"noignore\".\n\ |
9194 | Stop means reenter debugger if this signal happens (implies print).\n\ | |
9195 | Print means print a message if this signal happens.\n\ | |
9196 | Pass means let program see this signal; otherwise program doesn't know.\n\ | |
9197 | Ignore is a synonym for nopass and noignore is a synonym for pass.\n\ | |
dfbd5e7b PA |
9198 | Pass and Stop may be combined.\n\ |
9199 | \n\ | |
9200 | Multiple signals may be specified. Signal numbers and signal names\n\ | |
9201 | may be interspersed with actions, with the actions being performed for\n\ | |
9202 | all signals cumulatively specified.")); | |
de0bea00 | 9203 | set_cmd_completer (c, handle_completer); |
486c7739 | 9204 | |
c906108c | 9205 | if (!dbx_commands) |
1a966eab AC |
9206 | stop_command = add_cmd ("stop", class_obscure, |
9207 | not_just_help_class_command, _("\ | |
9208 | There is no `stop' command, but you can set a hook on `stop'.\n\ | |
c906108c | 9209 | This allows you to set a list of commands to be run each time execution\n\ |
1a966eab | 9210 | of the program stops."), &cmdlist); |
c906108c | 9211 | |
ccce17b0 | 9212 | add_setshow_zuinteger_cmd ("infrun", class_maintenance, &debug_infrun, _("\ |
85c07804 AC |
9213 | Set inferior debugging."), _("\ |
9214 | Show inferior debugging."), _("\ | |
9215 | When non-zero, inferior specific debugging is enabled."), | |
ccce17b0 YQ |
9216 | NULL, |
9217 | show_debug_infrun, | |
9218 | &setdebuglist, &showdebuglist); | |
527159b7 | 9219 | |
3e43a32a MS |
9220 | add_setshow_boolean_cmd ("displaced", class_maintenance, |
9221 | &debug_displaced, _("\ | |
237fc4c9 PA |
9222 | Set displaced stepping debugging."), _("\ |
9223 | Show displaced stepping debugging."), _("\ | |
9224 | When non-zero, displaced stepping specific debugging is enabled."), | |
9225 | NULL, | |
9226 | show_debug_displaced, | |
9227 | &setdebuglist, &showdebuglist); | |
9228 | ||
ad52ddc6 PA |
9229 | add_setshow_boolean_cmd ("non-stop", no_class, |
9230 | &non_stop_1, _("\ | |
9231 | Set whether gdb controls the inferior in non-stop mode."), _("\ | |
9232 | Show whether gdb controls the inferior in non-stop mode."), _("\ | |
9233 | When debugging a multi-threaded program and this setting is\n\ | |
9234 | off (the default, also called all-stop mode), when one thread stops\n\ | |
9235 | (for a breakpoint, watchpoint, exception, or similar events), GDB stops\n\ | |
9236 | all other threads in the program while you interact with the thread of\n\ | |
9237 | interest. When you continue or step a thread, you can allow the other\n\ | |
9238 | threads to run, or have them remain stopped, but while you inspect any\n\ | |
9239 | thread's state, all threads stop.\n\ | |
9240 | \n\ | |
9241 | In non-stop mode, when one thread stops, other threads can continue\n\ | |
9242 | to run freely. You'll be able to step each thread independently,\n\ | |
9243 | leave it stopped or free to run as needed."), | |
9244 | set_non_stop, | |
9245 | show_non_stop, | |
9246 | &setlist, | |
9247 | &showlist); | |
9248 | ||
a493e3e2 | 9249 | numsigs = (int) GDB_SIGNAL_LAST; |
8d749320 SM |
9250 | signal_stop = XNEWVEC (unsigned char, numsigs); |
9251 | signal_print = XNEWVEC (unsigned char, numsigs); | |
9252 | signal_program = XNEWVEC (unsigned char, numsigs); | |
9253 | signal_catch = XNEWVEC (unsigned char, numsigs); | |
9254 | signal_pass = XNEWVEC (unsigned char, numsigs); | |
c906108c SS |
9255 | for (i = 0; i < numsigs; i++) |
9256 | { | |
9257 | signal_stop[i] = 1; | |
9258 | signal_print[i] = 1; | |
9259 | signal_program[i] = 1; | |
ab04a2af | 9260 | signal_catch[i] = 0; |
c906108c SS |
9261 | } |
9262 | ||
4d9d9d04 PA |
9263 | /* Signals caused by debugger's own actions should not be given to |
9264 | the program afterwards. | |
9265 | ||
9266 | Do not deliver GDB_SIGNAL_TRAP by default, except when the user | |
9267 | explicitly specifies that it should be delivered to the target | |
9268 | program. Typically, that would occur when a user is debugging a | |
9269 | target monitor on a simulator: the target monitor sets a | |
9270 | breakpoint; the simulator encounters this breakpoint and halts | |
9271 | the simulation handing control to GDB; GDB, noting that the stop | |
9272 | address doesn't map to any known breakpoint, returns control back | |
9273 | to the simulator; the simulator then delivers the hardware | |
9274 | equivalent of a GDB_SIGNAL_TRAP to the program being | |
9275 | debugged. */ | |
a493e3e2 PA |
9276 | signal_program[GDB_SIGNAL_TRAP] = 0; |
9277 | signal_program[GDB_SIGNAL_INT] = 0; | |
c906108c SS |
9278 | |
9279 | /* Signals that are not errors should not normally enter the debugger. */ | |
a493e3e2 PA |
9280 | signal_stop[GDB_SIGNAL_ALRM] = 0; |
9281 | signal_print[GDB_SIGNAL_ALRM] = 0; | |
9282 | signal_stop[GDB_SIGNAL_VTALRM] = 0; | |
9283 | signal_print[GDB_SIGNAL_VTALRM] = 0; | |
9284 | signal_stop[GDB_SIGNAL_PROF] = 0; | |
9285 | signal_print[GDB_SIGNAL_PROF] = 0; | |
9286 | signal_stop[GDB_SIGNAL_CHLD] = 0; | |
9287 | signal_print[GDB_SIGNAL_CHLD] = 0; | |
9288 | signal_stop[GDB_SIGNAL_IO] = 0; | |
9289 | signal_print[GDB_SIGNAL_IO] = 0; | |
9290 | signal_stop[GDB_SIGNAL_POLL] = 0; | |
9291 | signal_print[GDB_SIGNAL_POLL] = 0; | |
9292 | signal_stop[GDB_SIGNAL_URG] = 0; | |
9293 | signal_print[GDB_SIGNAL_URG] = 0; | |
9294 | signal_stop[GDB_SIGNAL_WINCH] = 0; | |
9295 | signal_print[GDB_SIGNAL_WINCH] = 0; | |
9296 | signal_stop[GDB_SIGNAL_PRIO] = 0; | |
9297 | signal_print[GDB_SIGNAL_PRIO] = 0; | |
c906108c | 9298 | |
cd0fc7c3 SS |
9299 | /* These signals are used internally by user-level thread |
9300 | implementations. (See signal(5) on Solaris.) Like the above | |
9301 | signals, a healthy program receives and handles them as part of | |
9302 | its normal operation. */ | |
a493e3e2 PA |
9303 | signal_stop[GDB_SIGNAL_LWP] = 0; |
9304 | signal_print[GDB_SIGNAL_LWP] = 0; | |
9305 | signal_stop[GDB_SIGNAL_WAITING] = 0; | |
9306 | signal_print[GDB_SIGNAL_WAITING] = 0; | |
9307 | signal_stop[GDB_SIGNAL_CANCEL] = 0; | |
9308 | signal_print[GDB_SIGNAL_CANCEL] = 0; | |
bc7b765a JB |
9309 | signal_stop[GDB_SIGNAL_LIBRT] = 0; |
9310 | signal_print[GDB_SIGNAL_LIBRT] = 0; | |
cd0fc7c3 | 9311 | |
2455069d UW |
9312 | /* Update cached state. */ |
9313 | signal_cache_update (-1); | |
9314 | ||
85c07804 AC |
9315 | add_setshow_zinteger_cmd ("stop-on-solib-events", class_support, |
9316 | &stop_on_solib_events, _("\ | |
9317 | Set stopping for shared library events."), _("\ | |
9318 | Show stopping for shared library events."), _("\ | |
c906108c SS |
9319 | If nonzero, gdb will give control to the user when the dynamic linker\n\ |
9320 | notifies gdb of shared library events. The most common event of interest\n\ | |
85c07804 | 9321 | to the user would be loading/unloading of a new library."), |
f9e14852 | 9322 | set_stop_on_solib_events, |
920d2a44 | 9323 | show_stop_on_solib_events, |
85c07804 | 9324 | &setlist, &showlist); |
c906108c | 9325 | |
7ab04401 AC |
9326 | add_setshow_enum_cmd ("follow-fork-mode", class_run, |
9327 | follow_fork_mode_kind_names, | |
9328 | &follow_fork_mode_string, _("\ | |
9329 | Set debugger response to a program call of fork or vfork."), _("\ | |
9330 | Show debugger response to a program call of fork or vfork."), _("\ | |
c906108c SS |
9331 | A fork or vfork creates a new process. follow-fork-mode can be:\n\ |
9332 | parent - the original process is debugged after a fork\n\ | |
9333 | child - the new process is debugged after a fork\n\ | |
ea1dd7bc | 9334 | The unfollowed process will continue to run.\n\ |
7ab04401 AC |
9335 | By default, the debugger will follow the parent process."), |
9336 | NULL, | |
920d2a44 | 9337 | show_follow_fork_mode_string, |
7ab04401 AC |
9338 | &setlist, &showlist); |
9339 | ||
6c95b8df PA |
9340 | add_setshow_enum_cmd ("follow-exec-mode", class_run, |
9341 | follow_exec_mode_names, | |
9342 | &follow_exec_mode_string, _("\ | |
9343 | Set debugger response to a program call of exec."), _("\ | |
9344 | Show debugger response to a program call of exec."), _("\ | |
9345 | An exec call replaces the program image of a process.\n\ | |
9346 | \n\ | |
9347 | follow-exec-mode can be:\n\ | |
9348 | \n\ | |
cce7e648 | 9349 | new - the debugger creates a new inferior and rebinds the process\n\ |
6c95b8df PA |
9350 | to this new inferior. The program the process was running before\n\ |
9351 | the exec call can be restarted afterwards by restarting the original\n\ | |
9352 | inferior.\n\ | |
9353 | \n\ | |
9354 | same - the debugger keeps the process bound to the same inferior.\n\ | |
9355 | The new executable image replaces the previous executable loaded in\n\ | |
9356 | the inferior. Restarting the inferior after the exec call restarts\n\ | |
9357 | the executable the process was running after the exec call.\n\ | |
9358 | \n\ | |
9359 | By default, the debugger will use the same inferior."), | |
9360 | NULL, | |
9361 | show_follow_exec_mode_string, | |
9362 | &setlist, &showlist); | |
9363 | ||
7ab04401 AC |
9364 | add_setshow_enum_cmd ("scheduler-locking", class_run, |
9365 | scheduler_enums, &scheduler_mode, _("\ | |
9366 | Set mode for locking scheduler during execution."), _("\ | |
9367 | Show mode for locking scheduler during execution."), _("\ | |
f2665db5 MM |
9368 | off == no locking (threads may preempt at any time)\n\ |
9369 | on == full locking (no thread except the current thread may run)\n\ | |
9370 | This applies to both normal execution and replay mode.\n\ | |
9371 | step == scheduler locked during stepping commands (step, next, stepi, nexti).\n\ | |
9372 | In this mode, other threads may run during other commands.\n\ | |
9373 | This applies to both normal execution and replay mode.\n\ | |
9374 | replay == scheduler locked in replay mode and unlocked during normal execution."), | |
7ab04401 | 9375 | set_schedlock_func, /* traps on target vector */ |
920d2a44 | 9376 | show_scheduler_mode, |
7ab04401 | 9377 | &setlist, &showlist); |
5fbbeb29 | 9378 | |
d4db2f36 PA |
9379 | add_setshow_boolean_cmd ("schedule-multiple", class_run, &sched_multi, _("\ |
9380 | Set mode for resuming threads of all processes."), _("\ | |
9381 | Show mode for resuming threads of all processes."), _("\ | |
9382 | When on, execution commands (such as 'continue' or 'next') resume all\n\ | |
9383 | threads of all processes. When off (which is the default), execution\n\ | |
9384 | commands only resume the threads of the current process. The set of\n\ | |
9385 | threads that are resumed is further refined by the scheduler-locking\n\ | |
9386 | mode (see help set scheduler-locking)."), | |
9387 | NULL, | |
9388 | show_schedule_multiple, | |
9389 | &setlist, &showlist); | |
9390 | ||
5bf193a2 AC |
9391 | add_setshow_boolean_cmd ("step-mode", class_run, &step_stop_if_no_debug, _("\ |
9392 | Set mode of the step operation."), _("\ | |
9393 | Show mode of the step operation."), _("\ | |
9394 | When set, doing a step over a function without debug line information\n\ | |
9395 | will stop at the first instruction of that function. Otherwise, the\n\ | |
9396 | function is skipped and the step command stops at a different source line."), | |
9397 | NULL, | |
920d2a44 | 9398 | show_step_stop_if_no_debug, |
5bf193a2 | 9399 | &setlist, &showlist); |
ca6724c1 | 9400 | |
72d0e2c5 YQ |
9401 | add_setshow_auto_boolean_cmd ("displaced-stepping", class_run, |
9402 | &can_use_displaced_stepping, _("\ | |
237fc4c9 PA |
9403 | Set debugger's willingness to use displaced stepping."), _("\ |
9404 | Show debugger's willingness to use displaced stepping."), _("\ | |
fff08868 HZ |
9405 | If on, gdb will use displaced stepping to step over breakpoints if it is\n\ |
9406 | supported by the target architecture. If off, gdb will not use displaced\n\ | |
9407 | stepping to step over breakpoints, even if such is supported by the target\n\ | |
9408 | architecture. If auto (which is the default), gdb will use displaced stepping\n\ | |
9409 | if the target architecture supports it and non-stop mode is active, but will not\n\ | |
9410 | use it in all-stop mode (see help set non-stop)."), | |
72d0e2c5 YQ |
9411 | NULL, |
9412 | show_can_use_displaced_stepping, | |
9413 | &setlist, &showlist); | |
237fc4c9 | 9414 | |
b2175913 MS |
9415 | add_setshow_enum_cmd ("exec-direction", class_run, exec_direction_names, |
9416 | &exec_direction, _("Set direction of execution.\n\ | |
9417 | Options are 'forward' or 'reverse'."), | |
9418 | _("Show direction of execution (forward/reverse)."), | |
9419 | _("Tells gdb whether to execute forward or backward."), | |
9420 | set_exec_direction_func, show_exec_direction_func, | |
9421 | &setlist, &showlist); | |
9422 | ||
6c95b8df PA |
9423 | /* Set/show detach-on-fork: user-settable mode. */ |
9424 | ||
9425 | add_setshow_boolean_cmd ("detach-on-fork", class_run, &detach_fork, _("\ | |
9426 | Set whether gdb will detach the child of a fork."), _("\ | |
9427 | Show whether gdb will detach the child of a fork."), _("\ | |
9428 | Tells gdb whether to detach the child of a fork."), | |
9429 | NULL, NULL, &setlist, &showlist); | |
9430 | ||
03583c20 UW |
9431 | /* Set/show disable address space randomization mode. */ |
9432 | ||
9433 | add_setshow_boolean_cmd ("disable-randomization", class_support, | |
9434 | &disable_randomization, _("\ | |
9435 | Set disabling of debuggee's virtual address space randomization."), _("\ | |
9436 | Show disabling of debuggee's virtual address space randomization."), _("\ | |
9437 | When this mode is on (which is the default), randomization of the virtual\n\ | |
9438 | address space is disabled. Standalone programs run with the randomization\n\ | |
9439 | enabled by default on some platforms."), | |
9440 | &set_disable_randomization, | |
9441 | &show_disable_randomization, | |
9442 | &setlist, &showlist); | |
9443 | ||
ca6724c1 | 9444 | /* ptid initializations */ |
ca6724c1 KB |
9445 | inferior_ptid = null_ptid; |
9446 | target_last_wait_ptid = minus_one_ptid; | |
5231c1fd PA |
9447 | |
9448 | observer_attach_thread_ptid_changed (infrun_thread_ptid_changed); | |
252fbfc8 | 9449 | observer_attach_thread_stop_requested (infrun_thread_stop_requested); |
a07daef3 | 9450 | observer_attach_thread_exit (infrun_thread_thread_exit); |
fc1cf338 | 9451 | observer_attach_inferior_exit (infrun_inferior_exit); |
4aa995e1 PA |
9452 | |
9453 | /* Explicitly create without lookup, since that tries to create a | |
9454 | value with a void typed value, and when we get here, gdbarch | |
9455 | isn't initialized yet. At this point, we're quite sure there | |
9456 | isn't another convenience variable of the same name. */ | |
22d2b532 | 9457 | create_internalvar_type_lazy ("_siginfo", &siginfo_funcs, NULL); |
d914c394 SS |
9458 | |
9459 | add_setshow_boolean_cmd ("observer", no_class, | |
9460 | &observer_mode_1, _("\ | |
9461 | Set whether gdb controls the inferior in observer mode."), _("\ | |
9462 | Show whether gdb controls the inferior in observer mode."), _("\ | |
9463 | In observer mode, GDB can get data from the inferior, but not\n\ | |
9464 | affect its execution. Registers and memory may not be changed,\n\ | |
9465 | breakpoints may not be set, and the program cannot be interrupted\n\ | |
9466 | or signalled."), | |
9467 | set_observer_mode, | |
9468 | show_observer_mode, | |
9469 | &setlist, | |
9470 | &showlist); | |
c906108c | 9471 | } |