[gdbserver] Disable conditional breakpoints on no-hardware-single-step targets
[deliverable/binutils-gdb.git] / gdb / infrun.c
CommitLineData
ca557f44
AC
1/* Target-struct-independent code to start (run) and stop an inferior
2 process.
8926118c 3
32d0add0 4 Copyright (C) 1986-2015 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"
c906108c
SS
64
65/* Prototypes for local functions */
66
96baa820 67static void signals_info (char *, int);
c906108c 68
96baa820 69static void handle_command (char *, int);
c906108c 70
2ea28649 71static void sig_print_info (enum gdb_signal);
c906108c 72
96baa820 73static void sig_print_header (void);
c906108c 74
74b7792f 75static void resume_cleanups (void *);
c906108c 76
96baa820 77static int hook_stop_stub (void *);
c906108c 78
96baa820
JM
79static int restore_selected_frame (void *);
80
4ef3f3be 81static int follow_fork (void);
96baa820 82
d83ad864
DB
83static int follow_fork_inferior (int follow_child, int detach_fork);
84
85static void follow_inferior_reset_breakpoints (void);
86
96baa820 87static void set_schedlock_func (char *args, int from_tty,
488f131b 88 struct cmd_list_element *c);
96baa820 89
a289b8f6
JK
90static int currently_stepping (struct thread_info *tp);
91
96baa820 92void _initialize_infrun (void);
43ff13b4 93
e58b0e63
PA
94void nullify_last_target_wait_ptid (void);
95
2c03e5be 96static void insert_hp_step_resume_breakpoint_at_frame (struct frame_info *);
2484c66b
UW
97
98static void insert_step_resume_breakpoint_at_caller (struct frame_info *);
99
2484c66b
UW
100static void insert_longjmp_resume_breakpoint (struct gdbarch *, CORE_ADDR);
101
8550d3b3
YQ
102static int maybe_software_singlestep (struct gdbarch *gdbarch, CORE_ADDR pc);
103
5fbbeb29
CF
104/* When set, stop the 'step' command if we enter a function which has
105 no line number information. The normal behavior is that we step
106 over such function. */
107int step_stop_if_no_debug = 0;
920d2a44
AC
108static void
109show_step_stop_if_no_debug (struct ui_file *file, int from_tty,
110 struct cmd_list_element *c, const char *value)
111{
112 fprintf_filtered (file, _("Mode of the step operation is %s.\n"), value);
113}
5fbbeb29 114
1777feb0 115/* In asynchronous mode, but simulating synchronous execution. */
96baa820 116
43ff13b4
JM
117int sync_execution = 0;
118
b9f437de
PA
119/* proceed and normal_stop use this to notify the user when the
120 inferior stopped in a different thread than it had been running
121 in. */
96baa820 122
39f77062 123static ptid_t previous_inferior_ptid;
7a292a7a 124
07107ca6
LM
125/* If set (default for legacy reasons), when following a fork, GDB
126 will detach from one of the fork branches, child or parent.
127 Exactly which branch is detached depends on 'set follow-fork-mode'
128 setting. */
129
130static int detach_fork = 1;
6c95b8df 131
237fc4c9
PA
132int debug_displaced = 0;
133static void
134show_debug_displaced (struct ui_file *file, int from_tty,
135 struct cmd_list_element *c, const char *value)
136{
137 fprintf_filtered (file, _("Displace stepping debugging is %s.\n"), value);
138}
139
ccce17b0 140unsigned int debug_infrun = 0;
920d2a44
AC
141static void
142show_debug_infrun (struct ui_file *file, int from_tty,
143 struct cmd_list_element *c, const char *value)
144{
145 fprintf_filtered (file, _("Inferior debugging is %s.\n"), value);
146}
527159b7 147
03583c20
UW
148
149/* Support for disabling address space randomization. */
150
151int disable_randomization = 1;
152
153static void
154show_disable_randomization (struct ui_file *file, int from_tty,
155 struct cmd_list_element *c, const char *value)
156{
157 if (target_supports_disable_randomization ())
158 fprintf_filtered (file,
159 _("Disabling randomization of debuggee's "
160 "virtual address space is %s.\n"),
161 value);
162 else
163 fputs_filtered (_("Disabling randomization of debuggee's "
164 "virtual address space is unsupported on\n"
165 "this platform.\n"), file);
166}
167
168static void
169set_disable_randomization (char *args, int from_tty,
170 struct cmd_list_element *c)
171{
172 if (!target_supports_disable_randomization ())
173 error (_("Disabling randomization of debuggee's "
174 "virtual address space is unsupported on\n"
175 "this platform."));
176}
177
d32dc48e
PA
178/* User interface for non-stop mode. */
179
180int non_stop = 0;
181static int non_stop_1 = 0;
182
183static void
184set_non_stop (char *args, int from_tty,
185 struct cmd_list_element *c)
186{
187 if (target_has_execution)
188 {
189 non_stop_1 = non_stop;
190 error (_("Cannot change this setting while the inferior is running."));
191 }
192
193 non_stop = non_stop_1;
194}
195
196static void
197show_non_stop (struct ui_file *file, int from_tty,
198 struct cmd_list_element *c, const char *value)
199{
200 fprintf_filtered (file,
201 _("Controlling the inferior in non-stop mode is %s.\n"),
202 value);
203}
204
d914c394
SS
205/* "Observer mode" is somewhat like a more extreme version of
206 non-stop, in which all GDB operations that might affect the
207 target's execution have been disabled. */
208
d914c394
SS
209int observer_mode = 0;
210static int observer_mode_1 = 0;
211
212static void
213set_observer_mode (char *args, int from_tty,
214 struct cmd_list_element *c)
215{
d914c394
SS
216 if (target_has_execution)
217 {
218 observer_mode_1 = observer_mode;
219 error (_("Cannot change this setting while the inferior is running."));
220 }
221
222 observer_mode = observer_mode_1;
223
224 may_write_registers = !observer_mode;
225 may_write_memory = !observer_mode;
226 may_insert_breakpoints = !observer_mode;
227 may_insert_tracepoints = !observer_mode;
228 /* We can insert fast tracepoints in or out of observer mode,
229 but enable them if we're going into this mode. */
230 if (observer_mode)
231 may_insert_fast_tracepoints = 1;
232 may_stop = !observer_mode;
233 update_target_permissions ();
234
235 /* Going *into* observer mode we must force non-stop, then
236 going out we leave it that way. */
237 if (observer_mode)
238 {
d914c394
SS
239 pagination_enabled = 0;
240 non_stop = non_stop_1 = 1;
241 }
242
243 if (from_tty)
244 printf_filtered (_("Observer mode is now %s.\n"),
245 (observer_mode ? "on" : "off"));
246}
247
248static void
249show_observer_mode (struct ui_file *file, int from_tty,
250 struct cmd_list_element *c, const char *value)
251{
252 fprintf_filtered (file, _("Observer mode is %s.\n"), value);
253}
254
255/* This updates the value of observer mode based on changes in
256 permissions. Note that we are deliberately ignoring the values of
257 may-write-registers and may-write-memory, since the user may have
258 reason to enable these during a session, for instance to turn on a
259 debugging-related global. */
260
261void
262update_observer_mode (void)
263{
264 int newval;
265
266 newval = (!may_insert_breakpoints
267 && !may_insert_tracepoints
268 && may_insert_fast_tracepoints
269 && !may_stop
270 && non_stop);
271
272 /* Let the user know if things change. */
273 if (newval != observer_mode)
274 printf_filtered (_("Observer mode is now %s.\n"),
275 (newval ? "on" : "off"));
276
277 observer_mode = observer_mode_1 = newval;
278}
c2c6d25f 279
c906108c
SS
280/* Tables of how to react to signals; the user sets them. */
281
282static unsigned char *signal_stop;
283static unsigned char *signal_print;
284static unsigned char *signal_program;
285
ab04a2af
TT
286/* Table of signals that are registered with "catch signal". A
287 non-zero entry indicates that the signal is caught by some "catch
288 signal" command. This has size GDB_SIGNAL_LAST, to accommodate all
289 signals. */
290static unsigned char *signal_catch;
291
2455069d
UW
292/* Table of signals that the target may silently handle.
293 This is automatically determined from the flags above,
294 and simply cached here. */
295static unsigned char *signal_pass;
296
c906108c
SS
297#define SET_SIGS(nsigs,sigs,flags) \
298 do { \
299 int signum = (nsigs); \
300 while (signum-- > 0) \
301 if ((sigs)[signum]) \
302 (flags)[signum] = 1; \
303 } while (0)
304
305#define UNSET_SIGS(nsigs,sigs,flags) \
306 do { \
307 int signum = (nsigs); \
308 while (signum-- > 0) \
309 if ((sigs)[signum]) \
310 (flags)[signum] = 0; \
311 } while (0)
312
9b224c5e
PA
313/* Update the target's copy of SIGNAL_PROGRAM. The sole purpose of
314 this function is to avoid exporting `signal_program'. */
315
316void
317update_signals_program_target (void)
318{
a493e3e2 319 target_program_signals ((int) GDB_SIGNAL_LAST, signal_program);
9b224c5e
PA
320}
321
1777feb0 322/* Value to pass to target_resume() to cause all threads to resume. */
39f77062 323
edb3359d 324#define RESUME_ALL minus_one_ptid
c906108c
SS
325
326/* Command list pointer for the "stop" placeholder. */
327
328static struct cmd_list_element *stop_command;
329
c906108c
SS
330/* Nonzero if we want to give control to the user when we're notified
331 of shared library events by the dynamic linker. */
628fe4e4 332int stop_on_solib_events;
f9e14852
GB
333
334/* Enable or disable optional shared library event breakpoints
335 as appropriate when the above flag is changed. */
336
337static void
338set_stop_on_solib_events (char *args, int from_tty, struct cmd_list_element *c)
339{
340 update_solib_breakpoints ();
341}
342
920d2a44
AC
343static void
344show_stop_on_solib_events (struct ui_file *file, int from_tty,
345 struct cmd_list_element *c, const char *value)
346{
347 fprintf_filtered (file, _("Stopping for shared library events is %s.\n"),
348 value);
349}
c906108c 350
c906108c
SS
351/* Nonzero means expecting a trace trap
352 and should stop the inferior and return silently when it happens. */
353
354int stop_after_trap;
355
642fd101
DE
356/* Save register contents here when executing a "finish" command or are
357 about to pop a stack dummy frame, if-and-only-if proceed_to_finish is set.
c906108c
SS
358 Thus this contains the return value from the called function (assuming
359 values are returned in a register). */
360
72cec141 361struct regcache *stop_registers;
c906108c 362
c906108c
SS
363/* Nonzero after stop if current stack frame should be printed. */
364
365static int stop_print_frame;
366
e02bc4cc 367/* This is a cached copy of the pid/waitstatus of the last event
9a4105ab
AC
368 returned by target_wait()/deprecated_target_wait_hook(). This
369 information is returned by get_last_target_status(). */
39f77062 370static ptid_t target_last_wait_ptid;
e02bc4cc
DS
371static struct target_waitstatus target_last_waitstatus;
372
0d1e5fa7
PA
373static void context_switch (ptid_t ptid);
374
4e1c45ea 375void init_thread_stepping_state (struct thread_info *tss);
0d1e5fa7 376
53904c9e
AC
377static const char follow_fork_mode_child[] = "child";
378static const char follow_fork_mode_parent[] = "parent";
379
40478521 380static const char *const follow_fork_mode_kind_names[] = {
53904c9e
AC
381 follow_fork_mode_child,
382 follow_fork_mode_parent,
383 NULL
ef346e04 384};
c906108c 385
53904c9e 386static const char *follow_fork_mode_string = follow_fork_mode_parent;
920d2a44
AC
387static void
388show_follow_fork_mode_string (struct ui_file *file, int from_tty,
389 struct cmd_list_element *c, const char *value)
390{
3e43a32a
MS
391 fprintf_filtered (file,
392 _("Debugger response to a program "
393 "call of fork or vfork is \"%s\".\n"),
920d2a44
AC
394 value);
395}
c906108c
SS
396\f
397
d83ad864
DB
398/* Handle changes to the inferior list based on the type of fork,
399 which process is being followed, and whether the other process
400 should be detached. On entry inferior_ptid must be the ptid of
401 the fork parent. At return inferior_ptid is the ptid of the
402 followed inferior. */
403
404static int
405follow_fork_inferior (int follow_child, int detach_fork)
406{
407 int has_vforked;
79639e11 408 ptid_t parent_ptid, child_ptid;
d83ad864
DB
409
410 has_vforked = (inferior_thread ()->pending_follow.kind
411 == TARGET_WAITKIND_VFORKED);
79639e11
PA
412 parent_ptid = inferior_ptid;
413 child_ptid = inferior_thread ()->pending_follow.value.related_pid;
d83ad864
DB
414
415 if (has_vforked
416 && !non_stop /* Non-stop always resumes both branches. */
417 && (!target_is_async_p () || sync_execution)
418 && !(follow_child || detach_fork || sched_multi))
419 {
420 /* The parent stays blocked inside the vfork syscall until the
421 child execs or exits. If we don't let the child run, then
422 the parent stays blocked. If we're telling the parent to run
423 in the foreground, the user will not be able to ctrl-c to get
424 back the terminal, effectively hanging the debug session. */
425 fprintf_filtered (gdb_stderr, _("\
426Can not resume the parent process over vfork in the foreground while\n\
427holding the child stopped. Try \"set detach-on-fork\" or \
428\"set schedule-multiple\".\n"));
429 /* FIXME output string > 80 columns. */
430 return 1;
431 }
432
433 if (!follow_child)
434 {
435 /* Detach new forked process? */
436 if (detach_fork)
437 {
438 struct cleanup *old_chain;
439
440 /* Before detaching from the child, remove all breakpoints
441 from it. If we forked, then this has already been taken
442 care of by infrun.c. If we vforked however, any
443 breakpoint inserted in the parent is visible in the
444 child, even those added while stopped in a vfork
445 catchpoint. This will remove the breakpoints from the
446 parent also, but they'll be reinserted below. */
447 if (has_vforked)
448 {
449 /* Keep breakpoints list in sync. */
450 remove_breakpoints_pid (ptid_get_pid (inferior_ptid));
451 }
452
453 if (info_verbose || debug_infrun)
454 {
6f259a23 455 target_terminal_ours_for_output ();
d83ad864 456 fprintf_filtered (gdb_stdlog,
79639e11 457 _("Detaching after %s from child %s.\n"),
6f259a23 458 has_vforked ? "vfork" : "fork",
79639e11 459 target_pid_to_str (child_ptid));
d83ad864
DB
460 }
461 }
462 else
463 {
464 struct inferior *parent_inf, *child_inf;
465 struct cleanup *old_chain;
466
467 /* Add process to GDB's tables. */
79639e11 468 child_inf = add_inferior (ptid_get_pid (child_ptid));
d83ad864
DB
469
470 parent_inf = current_inferior ();
471 child_inf->attach_flag = parent_inf->attach_flag;
472 copy_terminal_info (child_inf, parent_inf);
473 child_inf->gdbarch = parent_inf->gdbarch;
474 copy_inferior_target_desc_info (child_inf, parent_inf);
475
476 old_chain = save_inferior_ptid ();
477 save_current_program_space ();
478
79639e11 479 inferior_ptid = child_ptid;
d83ad864
DB
480 add_thread (inferior_ptid);
481 child_inf->symfile_flags = SYMFILE_NO_READ;
482
483 /* If this is a vfork child, then the address-space is
484 shared with the parent. */
485 if (has_vforked)
486 {
487 child_inf->pspace = parent_inf->pspace;
488 child_inf->aspace = parent_inf->aspace;
489
490 /* The parent will be frozen until the child is done
491 with the shared region. Keep track of the
492 parent. */
493 child_inf->vfork_parent = parent_inf;
494 child_inf->pending_detach = 0;
495 parent_inf->vfork_child = child_inf;
496 parent_inf->pending_detach = 0;
497 }
498 else
499 {
500 child_inf->aspace = new_address_space ();
501 child_inf->pspace = add_program_space (child_inf->aspace);
502 child_inf->removable = 1;
503 set_current_program_space (child_inf->pspace);
504 clone_program_space (child_inf->pspace, parent_inf->pspace);
505
506 /* Let the shared library layer (e.g., solib-svr4) learn
507 about this new process, relocate the cloned exec, pull
508 in shared libraries, and install the solib event
509 breakpoint. If a "cloned-VM" event was propagated
510 better throughout the core, this wouldn't be
511 required. */
512 solib_create_inferior_hook (0);
513 }
514
515 do_cleanups (old_chain);
516 }
517
518 if (has_vforked)
519 {
520 struct inferior *parent_inf;
521
522 parent_inf = current_inferior ();
523
524 /* If we detached from the child, then we have to be careful
525 to not insert breakpoints in the parent until the child
526 is done with the shared memory region. However, if we're
527 staying attached to the child, then we can and should
528 insert breakpoints, so that we can debug it. A
529 subsequent child exec or exit is enough to know when does
530 the child stops using the parent's address space. */
531 parent_inf->waiting_for_vfork_done = detach_fork;
532 parent_inf->pspace->breakpoints_not_allowed = detach_fork;
533 }
534 }
535 else
536 {
537 /* Follow the child. */
538 struct inferior *parent_inf, *child_inf;
539 struct program_space *parent_pspace;
540
541 if (info_verbose || debug_infrun)
542 {
6f259a23
DB
543 target_terminal_ours_for_output ();
544 fprintf_filtered (gdb_stdlog,
79639e11
PA
545 _("Attaching after %s %s to child %s.\n"),
546 target_pid_to_str (parent_ptid),
6f259a23 547 has_vforked ? "vfork" : "fork",
79639e11 548 target_pid_to_str (child_ptid));
d83ad864
DB
549 }
550
551 /* Add the new inferior first, so that the target_detach below
552 doesn't unpush the target. */
553
79639e11 554 child_inf = add_inferior (ptid_get_pid (child_ptid));
d83ad864
DB
555
556 parent_inf = current_inferior ();
557 child_inf->attach_flag = parent_inf->attach_flag;
558 copy_terminal_info (child_inf, parent_inf);
559 child_inf->gdbarch = parent_inf->gdbarch;
560 copy_inferior_target_desc_info (child_inf, parent_inf);
561
562 parent_pspace = parent_inf->pspace;
563
564 /* If we're vforking, we want to hold on to the parent until the
565 child exits or execs. At child exec or exit time we can
566 remove the old breakpoints from the parent and detach or
567 resume debugging it. Otherwise, detach the parent now; we'll
568 want to reuse it's program/address spaces, but we can't set
569 them to the child before removing breakpoints from the
570 parent, otherwise, the breakpoints module could decide to
571 remove breakpoints from the wrong process (since they'd be
572 assigned to the same address space). */
573
574 if (has_vforked)
575 {
576 gdb_assert (child_inf->vfork_parent == NULL);
577 gdb_assert (parent_inf->vfork_child == NULL);
578 child_inf->vfork_parent = parent_inf;
579 child_inf->pending_detach = 0;
580 parent_inf->vfork_child = child_inf;
581 parent_inf->pending_detach = detach_fork;
582 parent_inf->waiting_for_vfork_done = 0;
583 }
584 else if (detach_fork)
6f259a23
DB
585 {
586 if (info_verbose || debug_infrun)
587 {
588 target_terminal_ours_for_output ();
589 fprintf_filtered (gdb_stdlog,
590 _("Detaching after fork from "
79639e11
PA
591 "child %s.\n"),
592 target_pid_to_str (child_ptid));
6f259a23
DB
593 }
594
595 target_detach (NULL, 0);
596 }
d83ad864
DB
597
598 /* Note that the detach above makes PARENT_INF dangling. */
599
600 /* Add the child thread to the appropriate lists, and switch to
601 this new thread, before cloning the program space, and
602 informing the solib layer about this new process. */
603
79639e11 604 inferior_ptid = child_ptid;
d83ad864
DB
605 add_thread (inferior_ptid);
606
607 /* If this is a vfork child, then the address-space is shared
608 with the parent. If we detached from the parent, then we can
609 reuse the parent's program/address spaces. */
610 if (has_vforked || detach_fork)
611 {
612 child_inf->pspace = parent_pspace;
613 child_inf->aspace = child_inf->pspace->aspace;
614 }
615 else
616 {
617 child_inf->aspace = new_address_space ();
618 child_inf->pspace = add_program_space (child_inf->aspace);
619 child_inf->removable = 1;
620 child_inf->symfile_flags = SYMFILE_NO_READ;
621 set_current_program_space (child_inf->pspace);
622 clone_program_space (child_inf->pspace, parent_pspace);
623
624 /* Let the shared library layer (e.g., solib-svr4) learn
625 about this new process, relocate the cloned exec, pull in
626 shared libraries, and install the solib event breakpoint.
627 If a "cloned-VM" event was propagated better throughout
628 the core, this wouldn't be required. */
629 solib_create_inferior_hook (0);
630 }
631 }
632
633 return target_follow_fork (follow_child, detach_fork);
634}
635
e58b0e63
PA
636/* Tell the target to follow the fork we're stopped at. Returns true
637 if the inferior should be resumed; false, if the target for some
638 reason decided it's best not to resume. */
639
6604731b 640static int
4ef3f3be 641follow_fork (void)
c906108c 642{
ea1dd7bc 643 int follow_child = (follow_fork_mode_string == follow_fork_mode_child);
e58b0e63
PA
644 int should_resume = 1;
645 struct thread_info *tp;
646
647 /* Copy user stepping state to the new inferior thread. FIXME: the
648 followed fork child thread should have a copy of most of the
4e3990f4
DE
649 parent thread structure's run control related fields, not just these.
650 Initialized to avoid "may be used uninitialized" warnings from gcc. */
651 struct breakpoint *step_resume_breakpoint = NULL;
186c406b 652 struct breakpoint *exception_resume_breakpoint = NULL;
4e3990f4
DE
653 CORE_ADDR step_range_start = 0;
654 CORE_ADDR step_range_end = 0;
655 struct frame_id step_frame_id = { 0 };
17b2616c 656 struct interp *command_interp = NULL;
e58b0e63
PA
657
658 if (!non_stop)
659 {
660 ptid_t wait_ptid;
661 struct target_waitstatus wait_status;
662
663 /* Get the last target status returned by target_wait(). */
664 get_last_target_status (&wait_ptid, &wait_status);
665
666 /* If not stopped at a fork event, then there's nothing else to
667 do. */
668 if (wait_status.kind != TARGET_WAITKIND_FORKED
669 && wait_status.kind != TARGET_WAITKIND_VFORKED)
670 return 1;
671
672 /* Check if we switched over from WAIT_PTID, since the event was
673 reported. */
674 if (!ptid_equal (wait_ptid, minus_one_ptid)
675 && !ptid_equal (inferior_ptid, wait_ptid))
676 {
677 /* We did. Switch back to WAIT_PTID thread, to tell the
678 target to follow it (in either direction). We'll
679 afterwards refuse to resume, and inform the user what
680 happened. */
681 switch_to_thread (wait_ptid);
682 should_resume = 0;
683 }
684 }
685
686 tp = inferior_thread ();
687
688 /* If there were any forks/vforks that were caught and are now to be
689 followed, then do so now. */
690 switch (tp->pending_follow.kind)
691 {
692 case TARGET_WAITKIND_FORKED:
693 case TARGET_WAITKIND_VFORKED:
694 {
695 ptid_t parent, child;
696
697 /* If the user did a next/step, etc, over a fork call,
698 preserve the stepping state in the fork child. */
699 if (follow_child && should_resume)
700 {
8358c15c
JK
701 step_resume_breakpoint = clone_momentary_breakpoint
702 (tp->control.step_resume_breakpoint);
16c381f0
JK
703 step_range_start = tp->control.step_range_start;
704 step_range_end = tp->control.step_range_end;
705 step_frame_id = tp->control.step_frame_id;
186c406b
TT
706 exception_resume_breakpoint
707 = clone_momentary_breakpoint (tp->control.exception_resume_breakpoint);
17b2616c 708 command_interp = tp->control.command_interp;
e58b0e63
PA
709
710 /* For now, delete the parent's sr breakpoint, otherwise,
711 parent/child sr breakpoints are considered duplicates,
712 and the child version will not be installed. Remove
713 this when the breakpoints module becomes aware of
714 inferiors and address spaces. */
715 delete_step_resume_breakpoint (tp);
16c381f0
JK
716 tp->control.step_range_start = 0;
717 tp->control.step_range_end = 0;
718 tp->control.step_frame_id = null_frame_id;
186c406b 719 delete_exception_resume_breakpoint (tp);
17b2616c 720 tp->control.command_interp = NULL;
e58b0e63
PA
721 }
722
723 parent = inferior_ptid;
724 child = tp->pending_follow.value.related_pid;
725
d83ad864
DB
726 /* Set up inferior(s) as specified by the caller, and tell the
727 target to do whatever is necessary to follow either parent
728 or child. */
729 if (follow_fork_inferior (follow_child, detach_fork))
e58b0e63
PA
730 {
731 /* Target refused to follow, or there's some other reason
732 we shouldn't resume. */
733 should_resume = 0;
734 }
735 else
736 {
737 /* This pending follow fork event is now handled, one way
738 or another. The previous selected thread may be gone
739 from the lists by now, but if it is still around, need
740 to clear the pending follow request. */
e09875d4 741 tp = find_thread_ptid (parent);
e58b0e63
PA
742 if (tp)
743 tp->pending_follow.kind = TARGET_WAITKIND_SPURIOUS;
744
745 /* This makes sure we don't try to apply the "Switched
746 over from WAIT_PID" logic above. */
747 nullify_last_target_wait_ptid ();
748
1777feb0 749 /* If we followed the child, switch to it... */
e58b0e63
PA
750 if (follow_child)
751 {
752 switch_to_thread (child);
753
754 /* ... and preserve the stepping state, in case the
755 user was stepping over the fork call. */
756 if (should_resume)
757 {
758 tp = inferior_thread ();
8358c15c
JK
759 tp->control.step_resume_breakpoint
760 = step_resume_breakpoint;
16c381f0
JK
761 tp->control.step_range_start = step_range_start;
762 tp->control.step_range_end = step_range_end;
763 tp->control.step_frame_id = step_frame_id;
186c406b
TT
764 tp->control.exception_resume_breakpoint
765 = exception_resume_breakpoint;
17b2616c 766 tp->control.command_interp = command_interp;
e58b0e63
PA
767 }
768 else
769 {
770 /* If we get here, it was because we're trying to
771 resume from a fork catchpoint, but, the user
772 has switched threads away from the thread that
773 forked. In that case, the resume command
774 issued is most likely not applicable to the
775 child, so just warn, and refuse to resume. */
3e43a32a
MS
776 warning (_("Not resuming: switched threads "
777 "before following fork child.\n"));
e58b0e63
PA
778 }
779
780 /* Reset breakpoints in the child as appropriate. */
781 follow_inferior_reset_breakpoints ();
782 }
783 else
784 switch_to_thread (parent);
785 }
786 }
787 break;
788 case TARGET_WAITKIND_SPURIOUS:
789 /* Nothing to follow. */
790 break;
791 default:
792 internal_error (__FILE__, __LINE__,
793 "Unexpected pending_follow.kind %d\n",
794 tp->pending_follow.kind);
795 break;
796 }
c906108c 797
e58b0e63 798 return should_resume;
c906108c
SS
799}
800
d83ad864 801static void
6604731b 802follow_inferior_reset_breakpoints (void)
c906108c 803{
4e1c45ea
PA
804 struct thread_info *tp = inferior_thread ();
805
6604731b
DJ
806 /* Was there a step_resume breakpoint? (There was if the user
807 did a "next" at the fork() call.) If so, explicitly reset its
a1aa2221
LM
808 thread number. Cloned step_resume breakpoints are disabled on
809 creation, so enable it here now that it is associated with the
810 correct thread.
6604731b
DJ
811
812 step_resumes are a form of bp that are made to be per-thread.
813 Since we created the step_resume bp when the parent process
814 was being debugged, and now are switching to the child process,
815 from the breakpoint package's viewpoint, that's a switch of
816 "threads". We must update the bp's notion of which thread
817 it is for, or it'll be ignored when it triggers. */
818
8358c15c 819 if (tp->control.step_resume_breakpoint)
a1aa2221
LM
820 {
821 breakpoint_re_set_thread (tp->control.step_resume_breakpoint);
822 tp->control.step_resume_breakpoint->loc->enabled = 1;
823 }
6604731b 824
a1aa2221 825 /* Treat exception_resume breakpoints like step_resume breakpoints. */
186c406b 826 if (tp->control.exception_resume_breakpoint)
a1aa2221
LM
827 {
828 breakpoint_re_set_thread (tp->control.exception_resume_breakpoint);
829 tp->control.exception_resume_breakpoint->loc->enabled = 1;
830 }
186c406b 831
6604731b
DJ
832 /* Reinsert all breakpoints in the child. The user may have set
833 breakpoints after catching the fork, in which case those
834 were never set in the child, but only in the parent. This makes
835 sure the inserted breakpoints match the breakpoint list. */
836
837 breakpoint_re_set ();
838 insert_breakpoints ();
c906108c 839}
c906108c 840
6c95b8df
PA
841/* The child has exited or execed: resume threads of the parent the
842 user wanted to be executing. */
843
844static int
845proceed_after_vfork_done (struct thread_info *thread,
846 void *arg)
847{
848 int pid = * (int *) arg;
849
850 if (ptid_get_pid (thread->ptid) == pid
851 && is_running (thread->ptid)
852 && !is_executing (thread->ptid)
853 && !thread->stop_requested
a493e3e2 854 && thread->suspend.stop_signal == GDB_SIGNAL_0)
6c95b8df
PA
855 {
856 if (debug_infrun)
857 fprintf_unfiltered (gdb_stdlog,
858 "infrun: resuming vfork parent thread %s\n",
859 target_pid_to_str (thread->ptid));
860
861 switch_to_thread (thread->ptid);
70509625 862 clear_proceed_status (0);
64ce06e4 863 proceed ((CORE_ADDR) -1, GDB_SIGNAL_DEFAULT);
6c95b8df
PA
864 }
865
866 return 0;
867}
868
869/* Called whenever we notice an exec or exit event, to handle
870 detaching or resuming a vfork parent. */
871
872static void
873handle_vfork_child_exec_or_exit (int exec)
874{
875 struct inferior *inf = current_inferior ();
876
877 if (inf->vfork_parent)
878 {
879 int resume_parent = -1;
880
881 /* This exec or exit marks the end of the shared memory region
882 between the parent and the child. If the user wanted to
883 detach from the parent, now is the time. */
884
885 if (inf->vfork_parent->pending_detach)
886 {
887 struct thread_info *tp;
888 struct cleanup *old_chain;
889 struct program_space *pspace;
890 struct address_space *aspace;
891
1777feb0 892 /* follow-fork child, detach-on-fork on. */
6c95b8df 893
68c9da30
PA
894 inf->vfork_parent->pending_detach = 0;
895
f50f4e56
PA
896 if (!exec)
897 {
898 /* If we're handling a child exit, then inferior_ptid
899 points at the inferior's pid, not to a thread. */
900 old_chain = save_inferior_ptid ();
901 save_current_program_space ();
902 save_current_inferior ();
903 }
904 else
905 old_chain = save_current_space_and_thread ();
6c95b8df
PA
906
907 /* We're letting loose of the parent. */
908 tp = any_live_thread_of_process (inf->vfork_parent->pid);
909 switch_to_thread (tp->ptid);
910
911 /* We're about to detach from the parent, which implicitly
912 removes breakpoints from its address space. There's a
913 catch here: we want to reuse the spaces for the child,
914 but, parent/child are still sharing the pspace at this
915 point, although the exec in reality makes the kernel give
916 the child a fresh set of new pages. The problem here is
917 that the breakpoints module being unaware of this, would
918 likely chose the child process to write to the parent
919 address space. Swapping the child temporarily away from
920 the spaces has the desired effect. Yes, this is "sort
921 of" a hack. */
922
923 pspace = inf->pspace;
924 aspace = inf->aspace;
925 inf->aspace = NULL;
926 inf->pspace = NULL;
927
928 if (debug_infrun || info_verbose)
929 {
6f259a23 930 target_terminal_ours_for_output ();
6c95b8df
PA
931
932 if (exec)
6f259a23
DB
933 {
934 fprintf_filtered (gdb_stdlog,
935 _("Detaching vfork parent process "
936 "%d after child exec.\n"),
937 inf->vfork_parent->pid);
938 }
6c95b8df 939 else
6f259a23
DB
940 {
941 fprintf_filtered (gdb_stdlog,
942 _("Detaching vfork parent process "
943 "%d after child exit.\n"),
944 inf->vfork_parent->pid);
945 }
6c95b8df
PA
946 }
947
948 target_detach (NULL, 0);
949
950 /* Put it back. */
951 inf->pspace = pspace;
952 inf->aspace = aspace;
953
954 do_cleanups (old_chain);
955 }
956 else if (exec)
957 {
958 /* We're staying attached to the parent, so, really give the
959 child a new address space. */
960 inf->pspace = add_program_space (maybe_new_address_space ());
961 inf->aspace = inf->pspace->aspace;
962 inf->removable = 1;
963 set_current_program_space (inf->pspace);
964
965 resume_parent = inf->vfork_parent->pid;
966
967 /* Break the bonds. */
968 inf->vfork_parent->vfork_child = NULL;
969 }
970 else
971 {
972 struct cleanup *old_chain;
973 struct program_space *pspace;
974
975 /* If this is a vfork child exiting, then the pspace and
976 aspaces were shared with the parent. Since we're
977 reporting the process exit, we'll be mourning all that is
978 found in the address space, and switching to null_ptid,
979 preparing to start a new inferior. But, since we don't
980 want to clobber the parent's address/program spaces, we
981 go ahead and create a new one for this exiting
982 inferior. */
983
984 /* Switch to null_ptid, so that clone_program_space doesn't want
985 to read the selected frame of a dead process. */
986 old_chain = save_inferior_ptid ();
987 inferior_ptid = null_ptid;
988
989 /* This inferior is dead, so avoid giving the breakpoints
990 module the option to write through to it (cloning a
991 program space resets breakpoints). */
992 inf->aspace = NULL;
993 inf->pspace = NULL;
994 pspace = add_program_space (maybe_new_address_space ());
995 set_current_program_space (pspace);
996 inf->removable = 1;
7dcd53a0 997 inf->symfile_flags = SYMFILE_NO_READ;
6c95b8df
PA
998 clone_program_space (pspace, inf->vfork_parent->pspace);
999 inf->pspace = pspace;
1000 inf->aspace = pspace->aspace;
1001
1002 /* Put back inferior_ptid. We'll continue mourning this
1777feb0 1003 inferior. */
6c95b8df
PA
1004 do_cleanups (old_chain);
1005
1006 resume_parent = inf->vfork_parent->pid;
1007 /* Break the bonds. */
1008 inf->vfork_parent->vfork_child = NULL;
1009 }
1010
1011 inf->vfork_parent = NULL;
1012
1013 gdb_assert (current_program_space == inf->pspace);
1014
1015 if (non_stop && resume_parent != -1)
1016 {
1017 /* If the user wanted the parent to be running, let it go
1018 free now. */
1019 struct cleanup *old_chain = make_cleanup_restore_current_thread ();
1020
1021 if (debug_infrun)
3e43a32a
MS
1022 fprintf_unfiltered (gdb_stdlog,
1023 "infrun: resuming vfork parent process %d\n",
6c95b8df
PA
1024 resume_parent);
1025
1026 iterate_over_threads (proceed_after_vfork_done, &resume_parent);
1027
1028 do_cleanups (old_chain);
1029 }
1030 }
1031}
1032
eb6c553b 1033/* Enum strings for "set|show follow-exec-mode". */
6c95b8df
PA
1034
1035static const char follow_exec_mode_new[] = "new";
1036static const char follow_exec_mode_same[] = "same";
40478521 1037static const char *const follow_exec_mode_names[] =
6c95b8df
PA
1038{
1039 follow_exec_mode_new,
1040 follow_exec_mode_same,
1041 NULL,
1042};
1043
1044static const char *follow_exec_mode_string = follow_exec_mode_same;
1045static void
1046show_follow_exec_mode_string (struct ui_file *file, int from_tty,
1047 struct cmd_list_element *c, const char *value)
1048{
1049 fprintf_filtered (file, _("Follow exec mode is \"%s\".\n"), value);
1050}
1051
1777feb0 1052/* EXECD_PATHNAME is assumed to be non-NULL. */
1adeb98a 1053
c906108c 1054static void
95e50b27 1055follow_exec (ptid_t ptid, char *execd_pathname)
c906108c 1056{
95e50b27 1057 struct thread_info *th, *tmp;
6c95b8df 1058 struct inferior *inf = current_inferior ();
95e50b27 1059 int pid = ptid_get_pid (ptid);
7a292a7a 1060
c906108c
SS
1061 /* This is an exec event that we actually wish to pay attention to.
1062 Refresh our symbol table to the newly exec'd program, remove any
1063 momentary bp's, etc.
1064
1065 If there are breakpoints, they aren't really inserted now,
1066 since the exec() transformed our inferior into a fresh set
1067 of instructions.
1068
1069 We want to preserve symbolic breakpoints on the list, since
1070 we have hopes that they can be reset after the new a.out's
1071 symbol table is read.
1072
1073 However, any "raw" breakpoints must be removed from the list
1074 (e.g., the solib bp's), since their address is probably invalid
1075 now.
1076
1077 And, we DON'T want to call delete_breakpoints() here, since
1078 that may write the bp's "shadow contents" (the instruction
1079 value that was overwritten witha TRAP instruction). Since
1777feb0 1080 we now have a new a.out, those shadow contents aren't valid. */
6c95b8df
PA
1081
1082 mark_breakpoints_out ();
1083
95e50b27
PA
1084 /* The target reports the exec event to the main thread, even if
1085 some other thread does the exec, and even if the main thread was
1086 stopped or already gone. We may still have non-leader threads of
1087 the process on our list. E.g., on targets that don't have thread
1088 exit events (like remote); or on native Linux in non-stop mode if
1089 there were only two threads in the inferior and the non-leader
1090 one is the one that execs (and nothing forces an update of the
1091 thread list up to here). When debugging remotely, it's best to
1092 avoid extra traffic, when possible, so avoid syncing the thread
1093 list with the target, and instead go ahead and delete all threads
1094 of the process but one that reported the event. Note this must
1095 be done before calling update_breakpoints_after_exec, as
1096 otherwise clearing the threads' resources would reference stale
1097 thread breakpoints -- it may have been one of these threads that
1098 stepped across the exec. We could just clear their stepping
1099 states, but as long as we're iterating, might as well delete
1100 them. Deleting them now rather than at the next user-visible
1101 stop provides a nicer sequence of events for user and MI
1102 notifications. */
8a06aea7 1103 ALL_THREADS_SAFE (th, tmp)
95e50b27
PA
1104 if (ptid_get_pid (th->ptid) == pid && !ptid_equal (th->ptid, ptid))
1105 delete_thread (th->ptid);
1106
1107 /* We also need to clear any left over stale state for the
1108 leader/event thread. E.g., if there was any step-resume
1109 breakpoint or similar, it's gone now. We cannot truly
1110 step-to-next statement through an exec(). */
1111 th = inferior_thread ();
8358c15c 1112 th->control.step_resume_breakpoint = NULL;
186c406b 1113 th->control.exception_resume_breakpoint = NULL;
34b7e8a6 1114 th->control.single_step_breakpoints = NULL;
16c381f0
JK
1115 th->control.step_range_start = 0;
1116 th->control.step_range_end = 0;
c906108c 1117
95e50b27
PA
1118 /* The user may have had the main thread held stopped in the
1119 previous image (e.g., schedlock on, or non-stop). Release
1120 it now. */
a75724bc
PA
1121 th->stop_requested = 0;
1122
95e50b27
PA
1123 update_breakpoints_after_exec ();
1124
1777feb0 1125 /* What is this a.out's name? */
6c95b8df
PA
1126 printf_unfiltered (_("%s is executing new program: %s\n"),
1127 target_pid_to_str (inferior_ptid),
1128 execd_pathname);
c906108c
SS
1129
1130 /* We've followed the inferior through an exec. Therefore, the
1777feb0 1131 inferior has essentially been killed & reborn. */
7a292a7a 1132
c906108c 1133 gdb_flush (gdb_stdout);
6ca15a4b
PA
1134
1135 breakpoint_init_inferior (inf_execd);
e85a822c 1136
ff862be4 1137 if (gdb_sysroot != NULL && *gdb_sysroot != '\0')
e85a822c 1138 {
998d2a3e 1139 char *name = exec_file_find (execd_pathname, NULL);
ff862be4
GB
1140
1141 execd_pathname = alloca (strlen (name) + 1);
1142 strcpy (execd_pathname, name);
1143 xfree (name);
e85a822c 1144 }
c906108c 1145
cce9b6bf
PA
1146 /* Reset the shared library package. This ensures that we get a
1147 shlib event when the child reaches "_start", at which point the
1148 dld will have had a chance to initialize the child. */
1149 /* Also, loading a symbol file below may trigger symbol lookups, and
1150 we don't want those to be satisfied by the libraries of the
1151 previous incarnation of this process. */
1152 no_shared_libraries (NULL, 0);
1153
6c95b8df
PA
1154 if (follow_exec_mode_string == follow_exec_mode_new)
1155 {
1156 struct program_space *pspace;
6c95b8df
PA
1157
1158 /* The user wants to keep the old inferior and program spaces
1159 around. Create a new fresh one, and switch to it. */
1160
1161 inf = add_inferior (current_inferior ()->pid);
1162 pspace = add_program_space (maybe_new_address_space ());
1163 inf->pspace = pspace;
1164 inf->aspace = pspace->aspace;
1165
1166 exit_inferior_num_silent (current_inferior ()->num);
1167
1168 set_current_inferior (inf);
1169 set_current_program_space (pspace);
1170 }
9107fc8d
PA
1171 else
1172 {
1173 /* The old description may no longer be fit for the new image.
1174 E.g, a 64-bit process exec'ed a 32-bit process. Clear the
1175 old description; we'll read a new one below. No need to do
1176 this on "follow-exec-mode new", as the old inferior stays
1177 around (its description is later cleared/refetched on
1178 restart). */
1179 target_clear_description ();
1180 }
6c95b8df
PA
1181
1182 gdb_assert (current_program_space == inf->pspace);
1183
1777feb0 1184 /* That a.out is now the one to use. */
6c95b8df
PA
1185 exec_file_attach (execd_pathname, 0);
1186
c1e56572
JK
1187 /* SYMFILE_DEFER_BP_RESET is used as the proper displacement for PIE
1188 (Position Independent Executable) main symbol file will get applied by
1189 solib_create_inferior_hook below. breakpoint_re_set would fail to insert
1190 the breakpoints with the zero displacement. */
1191
7dcd53a0
TT
1192 symbol_file_add (execd_pathname,
1193 (inf->symfile_flags
1194 | SYMFILE_MAINLINE | SYMFILE_DEFER_BP_RESET),
c1e56572
JK
1195 NULL, 0);
1196
7dcd53a0
TT
1197 if ((inf->symfile_flags & SYMFILE_NO_READ) == 0)
1198 set_initial_language ();
c906108c 1199
9107fc8d
PA
1200 /* If the target can specify a description, read it. Must do this
1201 after flipping to the new executable (because the target supplied
1202 description must be compatible with the executable's
1203 architecture, and the old executable may e.g., be 32-bit, while
1204 the new one 64-bit), and before anything involving memory or
1205 registers. */
1206 target_find_description ();
1207
268a4a75 1208 solib_create_inferior_hook (0);
c906108c 1209
4efc6507
DE
1210 jit_inferior_created_hook ();
1211
c1e56572
JK
1212 breakpoint_re_set ();
1213
c906108c
SS
1214 /* Reinsert all breakpoints. (Those which were symbolic have
1215 been reset to the proper address in the new a.out, thanks
1777feb0 1216 to symbol_file_command...). */
c906108c
SS
1217 insert_breakpoints ();
1218
1219 /* The next resume of this inferior should bring it to the shlib
1220 startup breakpoints. (If the user had also set bp's on
1221 "main" from the old (parent) process, then they'll auto-
1777feb0 1222 matically get reset there in the new process.). */
c906108c
SS
1223}
1224
963f9c80 1225/* Info about an instruction that is being stepped over. */
31e77af2
PA
1226
1227struct step_over_info
1228{
963f9c80
PA
1229 /* If we're stepping past a breakpoint, this is the address space
1230 and address of the instruction the breakpoint is set at. We'll
1231 skip inserting all breakpoints here. Valid iff ASPACE is
1232 non-NULL. */
31e77af2 1233 struct address_space *aspace;
31e77af2 1234 CORE_ADDR address;
963f9c80
PA
1235
1236 /* The instruction being stepped over triggers a nonsteppable
1237 watchpoint. If true, we'll skip inserting watchpoints. */
1238 int nonsteppable_watchpoint_p;
31e77af2
PA
1239};
1240
1241/* The step-over info of the location that is being stepped over.
1242
1243 Note that with async/breakpoint always-inserted mode, a user might
1244 set a new breakpoint/watchpoint/etc. exactly while a breakpoint is
1245 being stepped over. As setting a new breakpoint inserts all
1246 breakpoints, we need to make sure the breakpoint being stepped over
1247 isn't inserted then. We do that by only clearing the step-over
1248 info when the step-over is actually finished (or aborted).
1249
1250 Presently GDB can only step over one breakpoint at any given time.
1251 Given threads that can't run code in the same address space as the
1252 breakpoint's can't really miss the breakpoint, GDB could be taught
1253 to step-over at most one breakpoint per address space (so this info
1254 could move to the address space object if/when GDB is extended).
1255 The set of breakpoints being stepped over will normally be much
1256 smaller than the set of all breakpoints, so a flag in the
1257 breakpoint location structure would be wasteful. A separate list
1258 also saves complexity and run-time, as otherwise we'd have to go
1259 through all breakpoint locations clearing their flag whenever we
1260 start a new sequence. Similar considerations weigh against storing
1261 this info in the thread object. Plus, not all step overs actually
1262 have breakpoint locations -- e.g., stepping past a single-step
1263 breakpoint, or stepping to complete a non-continuable
1264 watchpoint. */
1265static struct step_over_info step_over_info;
1266
1267/* Record the address of the breakpoint/instruction we're currently
1268 stepping over. */
1269
1270static void
963f9c80
PA
1271set_step_over_info (struct address_space *aspace, CORE_ADDR address,
1272 int nonsteppable_watchpoint_p)
31e77af2
PA
1273{
1274 step_over_info.aspace = aspace;
1275 step_over_info.address = address;
963f9c80 1276 step_over_info.nonsteppable_watchpoint_p = nonsteppable_watchpoint_p;
31e77af2
PA
1277}
1278
1279/* Called when we're not longer stepping over a breakpoint / an
1280 instruction, so all breakpoints are free to be (re)inserted. */
1281
1282static void
1283clear_step_over_info (void)
1284{
1285 step_over_info.aspace = NULL;
1286 step_over_info.address = 0;
963f9c80 1287 step_over_info.nonsteppable_watchpoint_p = 0;
31e77af2
PA
1288}
1289
7f89fd65 1290/* See infrun.h. */
31e77af2
PA
1291
1292int
1293stepping_past_instruction_at (struct address_space *aspace,
1294 CORE_ADDR address)
1295{
1296 return (step_over_info.aspace != NULL
1297 && breakpoint_address_match (aspace, address,
1298 step_over_info.aspace,
1299 step_over_info.address));
1300}
1301
963f9c80
PA
1302/* See infrun.h. */
1303
1304int
1305stepping_past_nonsteppable_watchpoint (void)
1306{
1307 return step_over_info.nonsteppable_watchpoint_p;
1308}
1309
6cc83d2a
PA
1310/* Returns true if step-over info is valid. */
1311
1312static int
1313step_over_info_valid_p (void)
1314{
963f9c80
PA
1315 return (step_over_info.aspace != NULL
1316 || stepping_past_nonsteppable_watchpoint ());
6cc83d2a
PA
1317}
1318
c906108c 1319\f
237fc4c9
PA
1320/* Displaced stepping. */
1321
1322/* In non-stop debugging mode, we must take special care to manage
1323 breakpoints properly; in particular, the traditional strategy for
1324 stepping a thread past a breakpoint it has hit is unsuitable.
1325 'Displaced stepping' is a tactic for stepping one thread past a
1326 breakpoint it has hit while ensuring that other threads running
1327 concurrently will hit the breakpoint as they should.
1328
1329 The traditional way to step a thread T off a breakpoint in a
1330 multi-threaded program in all-stop mode is as follows:
1331
1332 a0) Initially, all threads are stopped, and breakpoints are not
1333 inserted.
1334 a1) We single-step T, leaving breakpoints uninserted.
1335 a2) We insert breakpoints, and resume all threads.
1336
1337 In non-stop debugging, however, this strategy is unsuitable: we
1338 don't want to have to stop all threads in the system in order to
1339 continue or step T past a breakpoint. Instead, we use displaced
1340 stepping:
1341
1342 n0) Initially, T is stopped, other threads are running, and
1343 breakpoints are inserted.
1344 n1) We copy the instruction "under" the breakpoint to a separate
1345 location, outside the main code stream, making any adjustments
1346 to the instruction, register, and memory state as directed by
1347 T's architecture.
1348 n2) We single-step T over the instruction at its new location.
1349 n3) We adjust the resulting register and memory state as directed
1350 by T's architecture. This includes resetting T's PC to point
1351 back into the main instruction stream.
1352 n4) We resume T.
1353
1354 This approach depends on the following gdbarch methods:
1355
1356 - gdbarch_max_insn_length and gdbarch_displaced_step_location
1357 indicate where to copy the instruction, and how much space must
1358 be reserved there. We use these in step n1.
1359
1360 - gdbarch_displaced_step_copy_insn copies a instruction to a new
1361 address, and makes any necessary adjustments to the instruction,
1362 register contents, and memory. We use this in step n1.
1363
1364 - gdbarch_displaced_step_fixup adjusts registers and memory after
1365 we have successfuly single-stepped the instruction, to yield the
1366 same effect the instruction would have had if we had executed it
1367 at its original address. We use this in step n3.
1368
1369 - gdbarch_displaced_step_free_closure provides cleanup.
1370
1371 The gdbarch_displaced_step_copy_insn and
1372 gdbarch_displaced_step_fixup functions must be written so that
1373 copying an instruction with gdbarch_displaced_step_copy_insn,
1374 single-stepping across the copied instruction, and then applying
1375 gdbarch_displaced_insn_fixup should have the same effects on the
1376 thread's memory and registers as stepping the instruction in place
1377 would have. Exactly which responsibilities fall to the copy and
1378 which fall to the fixup is up to the author of those functions.
1379
1380 See the comments in gdbarch.sh for details.
1381
1382 Note that displaced stepping and software single-step cannot
1383 currently be used in combination, although with some care I think
1384 they could be made to. Software single-step works by placing
1385 breakpoints on all possible subsequent instructions; if the
1386 displaced instruction is a PC-relative jump, those breakpoints
1387 could fall in very strange places --- on pages that aren't
1388 executable, or at addresses that are not proper instruction
1389 boundaries. (We do generally let other threads run while we wait
1390 to hit the software single-step breakpoint, and they might
1391 encounter such a corrupted instruction.) One way to work around
1392 this would be to have gdbarch_displaced_step_copy_insn fully
1393 simulate the effect of PC-relative instructions (and return NULL)
1394 on architectures that use software single-stepping.
1395
1396 In non-stop mode, we can have independent and simultaneous step
1397 requests, so more than one thread may need to simultaneously step
1398 over a breakpoint. The current implementation assumes there is
1399 only one scratch space per process. In this case, we have to
1400 serialize access to the scratch space. If thread A wants to step
1401 over a breakpoint, but we are currently waiting for some other
1402 thread to complete a displaced step, we leave thread A stopped and
1403 place it in the displaced_step_request_queue. Whenever a displaced
1404 step finishes, we pick the next thread in the queue and start a new
1405 displaced step operation on it. See displaced_step_prepare and
1406 displaced_step_fixup for details. */
1407
237fc4c9
PA
1408struct displaced_step_request
1409{
1410 ptid_t ptid;
1411 struct displaced_step_request *next;
1412};
1413
fc1cf338
PA
1414/* Per-inferior displaced stepping state. */
1415struct displaced_step_inferior_state
1416{
1417 /* Pointer to next in linked list. */
1418 struct displaced_step_inferior_state *next;
1419
1420 /* The process this displaced step state refers to. */
1421 int pid;
1422
1423 /* A queue of pending displaced stepping requests. One entry per
1424 thread that needs to do a displaced step. */
1425 struct displaced_step_request *step_request_queue;
1426
1427 /* If this is not null_ptid, this is the thread carrying out a
1428 displaced single-step in process PID. This thread's state will
1429 require fixing up once it has completed its step. */
1430 ptid_t step_ptid;
1431
1432 /* The architecture the thread had when we stepped it. */
1433 struct gdbarch *step_gdbarch;
1434
1435 /* The closure provided gdbarch_displaced_step_copy_insn, to be used
1436 for post-step cleanup. */
1437 struct displaced_step_closure *step_closure;
1438
1439 /* The address of the original instruction, and the copy we
1440 made. */
1441 CORE_ADDR step_original, step_copy;
1442
1443 /* Saved contents of copy area. */
1444 gdb_byte *step_saved_copy;
1445};
1446
1447/* The list of states of processes involved in displaced stepping
1448 presently. */
1449static struct displaced_step_inferior_state *displaced_step_inferior_states;
1450
1451/* Get the displaced stepping state of process PID. */
1452
1453static struct displaced_step_inferior_state *
1454get_displaced_stepping_state (int pid)
1455{
1456 struct displaced_step_inferior_state *state;
1457
1458 for (state = displaced_step_inferior_states;
1459 state != NULL;
1460 state = state->next)
1461 if (state->pid == pid)
1462 return state;
1463
1464 return NULL;
1465}
1466
8f572e5c
PA
1467/* Return true if process PID has a thread doing a displaced step. */
1468
1469static int
1470displaced_step_in_progress (int pid)
1471{
1472 struct displaced_step_inferior_state *displaced;
1473
1474 displaced = get_displaced_stepping_state (pid);
1475 if (displaced != NULL && !ptid_equal (displaced->step_ptid, null_ptid))
1476 return 1;
1477
1478 return 0;
1479}
1480
fc1cf338
PA
1481/* Add a new displaced stepping state for process PID to the displaced
1482 stepping state list, or return a pointer to an already existing
1483 entry, if it already exists. Never returns NULL. */
1484
1485static struct displaced_step_inferior_state *
1486add_displaced_stepping_state (int pid)
1487{
1488 struct displaced_step_inferior_state *state;
1489
1490 for (state = displaced_step_inferior_states;
1491 state != NULL;
1492 state = state->next)
1493 if (state->pid == pid)
1494 return state;
237fc4c9 1495
fc1cf338
PA
1496 state = xcalloc (1, sizeof (*state));
1497 state->pid = pid;
1498 state->next = displaced_step_inferior_states;
1499 displaced_step_inferior_states = state;
237fc4c9 1500
fc1cf338
PA
1501 return state;
1502}
1503
a42244db
YQ
1504/* If inferior is in displaced stepping, and ADDR equals to starting address
1505 of copy area, return corresponding displaced_step_closure. Otherwise,
1506 return NULL. */
1507
1508struct displaced_step_closure*
1509get_displaced_step_closure_by_addr (CORE_ADDR addr)
1510{
1511 struct displaced_step_inferior_state *displaced
1512 = get_displaced_stepping_state (ptid_get_pid (inferior_ptid));
1513
1514 /* If checking the mode of displaced instruction in copy area. */
1515 if (displaced && !ptid_equal (displaced->step_ptid, null_ptid)
1516 && (displaced->step_copy == addr))
1517 return displaced->step_closure;
1518
1519 return NULL;
1520}
1521
fc1cf338 1522/* Remove the displaced stepping state of process PID. */
237fc4c9 1523
fc1cf338
PA
1524static void
1525remove_displaced_stepping_state (int pid)
1526{
1527 struct displaced_step_inferior_state *it, **prev_next_p;
237fc4c9 1528
fc1cf338
PA
1529 gdb_assert (pid != 0);
1530
1531 it = displaced_step_inferior_states;
1532 prev_next_p = &displaced_step_inferior_states;
1533 while (it)
1534 {
1535 if (it->pid == pid)
1536 {
1537 *prev_next_p = it->next;
1538 xfree (it);
1539 return;
1540 }
1541
1542 prev_next_p = &it->next;
1543 it = *prev_next_p;
1544 }
1545}
1546
1547static void
1548infrun_inferior_exit (struct inferior *inf)
1549{
1550 remove_displaced_stepping_state (inf->pid);
1551}
237fc4c9 1552
fff08868
HZ
1553/* If ON, and the architecture supports it, GDB will use displaced
1554 stepping to step over breakpoints. If OFF, or if the architecture
1555 doesn't support it, GDB will instead use the traditional
1556 hold-and-step approach. If AUTO (which is the default), GDB will
1557 decide which technique to use to step over breakpoints depending on
1558 which of all-stop or non-stop mode is active --- displaced stepping
1559 in non-stop mode; hold-and-step in all-stop mode. */
1560
72d0e2c5 1561static enum auto_boolean can_use_displaced_stepping = AUTO_BOOLEAN_AUTO;
fff08868 1562
237fc4c9
PA
1563static void
1564show_can_use_displaced_stepping (struct ui_file *file, int from_tty,
1565 struct cmd_list_element *c,
1566 const char *value)
1567{
72d0e2c5 1568 if (can_use_displaced_stepping == AUTO_BOOLEAN_AUTO)
3e43a32a
MS
1569 fprintf_filtered (file,
1570 _("Debugger's willingness to use displaced stepping "
1571 "to step over breakpoints is %s (currently %s).\n"),
fff08868
HZ
1572 value, non_stop ? "on" : "off");
1573 else
3e43a32a
MS
1574 fprintf_filtered (file,
1575 _("Debugger's willingness to use displaced stepping "
1576 "to step over breakpoints is %s.\n"), value);
237fc4c9
PA
1577}
1578
fff08868
HZ
1579/* Return non-zero if displaced stepping can/should be used to step
1580 over breakpoints. */
1581
237fc4c9
PA
1582static int
1583use_displaced_stepping (struct gdbarch *gdbarch)
1584{
72d0e2c5
YQ
1585 return (((can_use_displaced_stepping == AUTO_BOOLEAN_AUTO && non_stop)
1586 || can_use_displaced_stepping == AUTO_BOOLEAN_TRUE)
96429cc8 1587 && gdbarch_displaced_step_copy_insn_p (gdbarch)
8213266a 1588 && find_record_target () == NULL);
237fc4c9
PA
1589}
1590
1591/* Clean out any stray displaced stepping state. */
1592static void
fc1cf338 1593displaced_step_clear (struct displaced_step_inferior_state *displaced)
237fc4c9
PA
1594{
1595 /* Indicate that there is no cleanup pending. */
fc1cf338 1596 displaced->step_ptid = null_ptid;
237fc4c9 1597
fc1cf338 1598 if (displaced->step_closure)
237fc4c9 1599 {
fc1cf338
PA
1600 gdbarch_displaced_step_free_closure (displaced->step_gdbarch,
1601 displaced->step_closure);
1602 displaced->step_closure = NULL;
237fc4c9
PA
1603 }
1604}
1605
1606static void
fc1cf338 1607displaced_step_clear_cleanup (void *arg)
237fc4c9 1608{
fc1cf338
PA
1609 struct displaced_step_inferior_state *state = arg;
1610
1611 displaced_step_clear (state);
237fc4c9
PA
1612}
1613
1614/* Dump LEN bytes at BUF in hex to FILE, followed by a newline. */
1615void
1616displaced_step_dump_bytes (struct ui_file *file,
1617 const gdb_byte *buf,
1618 size_t len)
1619{
1620 int i;
1621
1622 for (i = 0; i < len; i++)
1623 fprintf_unfiltered (file, "%02x ", buf[i]);
1624 fputs_unfiltered ("\n", file);
1625}
1626
1627/* Prepare to single-step, using displaced stepping.
1628
1629 Note that we cannot use displaced stepping when we have a signal to
1630 deliver. If we have a signal to deliver and an instruction to step
1631 over, then after the step, there will be no indication from the
1632 target whether the thread entered a signal handler or ignored the
1633 signal and stepped over the instruction successfully --- both cases
1634 result in a simple SIGTRAP. In the first case we mustn't do a
1635 fixup, and in the second case we must --- but we can't tell which.
1636 Comments in the code for 'random signals' in handle_inferior_event
1637 explain how we handle this case instead.
1638
1639 Returns 1 if preparing was successful -- this thread is going to be
1640 stepped now; or 0 if displaced stepping this thread got queued. */
1641static int
1642displaced_step_prepare (ptid_t ptid)
1643{
ad53cd71 1644 struct cleanup *old_cleanups, *ignore_cleanups;
c1e36e3e 1645 struct thread_info *tp = find_thread_ptid (ptid);
237fc4c9
PA
1646 struct regcache *regcache = get_thread_regcache (ptid);
1647 struct gdbarch *gdbarch = get_regcache_arch (regcache);
1648 CORE_ADDR original, copy;
1649 ULONGEST len;
1650 struct displaced_step_closure *closure;
fc1cf338 1651 struct displaced_step_inferior_state *displaced;
9e529e1d 1652 int status;
237fc4c9
PA
1653
1654 /* We should never reach this function if the architecture does not
1655 support displaced stepping. */
1656 gdb_assert (gdbarch_displaced_step_copy_insn_p (gdbarch));
1657
c1e36e3e
PA
1658 /* Disable range stepping while executing in the scratch pad. We
1659 want a single-step even if executing the displaced instruction in
1660 the scratch buffer lands within the stepping range (e.g., a
1661 jump/branch). */
1662 tp->control.may_range_step = 0;
1663
fc1cf338
PA
1664 /* We have to displaced step one thread at a time, as we only have
1665 access to a single scratch space per inferior. */
237fc4c9 1666
fc1cf338
PA
1667 displaced = add_displaced_stepping_state (ptid_get_pid (ptid));
1668
1669 if (!ptid_equal (displaced->step_ptid, null_ptid))
237fc4c9
PA
1670 {
1671 /* Already waiting for a displaced step to finish. Defer this
1672 request and place in queue. */
1673 struct displaced_step_request *req, *new_req;
1674
1675 if (debug_displaced)
1676 fprintf_unfiltered (gdb_stdlog,
1677 "displaced: defering step of %s\n",
1678 target_pid_to_str (ptid));
1679
1680 new_req = xmalloc (sizeof (*new_req));
1681 new_req->ptid = ptid;
1682 new_req->next = NULL;
1683
fc1cf338 1684 if (displaced->step_request_queue)
237fc4c9 1685 {
fc1cf338 1686 for (req = displaced->step_request_queue;
237fc4c9
PA
1687 req && req->next;
1688 req = req->next)
1689 ;
1690 req->next = new_req;
1691 }
1692 else
fc1cf338 1693 displaced->step_request_queue = new_req;
237fc4c9
PA
1694
1695 return 0;
1696 }
1697 else
1698 {
1699 if (debug_displaced)
1700 fprintf_unfiltered (gdb_stdlog,
1701 "displaced: stepping %s now\n",
1702 target_pid_to_str (ptid));
1703 }
1704
fc1cf338 1705 displaced_step_clear (displaced);
237fc4c9 1706
ad53cd71
PA
1707 old_cleanups = save_inferior_ptid ();
1708 inferior_ptid = ptid;
1709
515630c5 1710 original = regcache_read_pc (regcache);
237fc4c9
PA
1711
1712 copy = gdbarch_displaced_step_location (gdbarch);
1713 len = gdbarch_max_insn_length (gdbarch);
1714
1715 /* Save the original contents of the copy area. */
fc1cf338 1716 displaced->step_saved_copy = xmalloc (len);
ad53cd71 1717 ignore_cleanups = make_cleanup (free_current_contents,
fc1cf338 1718 &displaced->step_saved_copy);
9e529e1d
JK
1719 status = target_read_memory (copy, displaced->step_saved_copy, len);
1720 if (status != 0)
1721 throw_error (MEMORY_ERROR,
1722 _("Error accessing memory address %s (%s) for "
1723 "displaced-stepping scratch space."),
1724 paddress (gdbarch, copy), safe_strerror (status));
237fc4c9
PA
1725 if (debug_displaced)
1726 {
5af949e3
UW
1727 fprintf_unfiltered (gdb_stdlog, "displaced: saved %s: ",
1728 paddress (gdbarch, copy));
fc1cf338
PA
1729 displaced_step_dump_bytes (gdb_stdlog,
1730 displaced->step_saved_copy,
1731 len);
237fc4c9
PA
1732 };
1733
1734 closure = gdbarch_displaced_step_copy_insn (gdbarch,
ad53cd71 1735 original, copy, regcache);
237fc4c9
PA
1736
1737 /* We don't support the fully-simulated case at present. */
1738 gdb_assert (closure);
1739
9f5a595d
UW
1740 /* Save the information we need to fix things up if the step
1741 succeeds. */
fc1cf338
PA
1742 displaced->step_ptid = ptid;
1743 displaced->step_gdbarch = gdbarch;
1744 displaced->step_closure = closure;
1745 displaced->step_original = original;
1746 displaced->step_copy = copy;
9f5a595d 1747
fc1cf338 1748 make_cleanup (displaced_step_clear_cleanup, displaced);
237fc4c9
PA
1749
1750 /* Resume execution at the copy. */
515630c5 1751 regcache_write_pc (regcache, copy);
237fc4c9 1752
ad53cd71
PA
1753 discard_cleanups (ignore_cleanups);
1754
1755 do_cleanups (old_cleanups);
237fc4c9
PA
1756
1757 if (debug_displaced)
5af949e3
UW
1758 fprintf_unfiltered (gdb_stdlog, "displaced: displaced pc to %s\n",
1759 paddress (gdbarch, copy));
237fc4c9 1760
237fc4c9
PA
1761 return 1;
1762}
1763
237fc4c9 1764static void
3e43a32a
MS
1765write_memory_ptid (ptid_t ptid, CORE_ADDR memaddr,
1766 const gdb_byte *myaddr, int len)
237fc4c9
PA
1767{
1768 struct cleanup *ptid_cleanup = save_inferior_ptid ();
abbb1732 1769
237fc4c9
PA
1770 inferior_ptid = ptid;
1771 write_memory (memaddr, myaddr, len);
1772 do_cleanups (ptid_cleanup);
1773}
1774
e2d96639
YQ
1775/* Restore the contents of the copy area for thread PTID. */
1776
1777static void
1778displaced_step_restore (struct displaced_step_inferior_state *displaced,
1779 ptid_t ptid)
1780{
1781 ULONGEST len = gdbarch_max_insn_length (displaced->step_gdbarch);
1782
1783 write_memory_ptid (ptid, displaced->step_copy,
1784 displaced->step_saved_copy, len);
1785 if (debug_displaced)
1786 fprintf_unfiltered (gdb_stdlog, "displaced: restored %s %s\n",
1787 target_pid_to_str (ptid),
1788 paddress (displaced->step_gdbarch,
1789 displaced->step_copy));
1790}
1791
237fc4c9 1792static void
2ea28649 1793displaced_step_fixup (ptid_t event_ptid, enum gdb_signal signal)
237fc4c9
PA
1794{
1795 struct cleanup *old_cleanups;
fc1cf338
PA
1796 struct displaced_step_inferior_state *displaced
1797 = get_displaced_stepping_state (ptid_get_pid (event_ptid));
1798
1799 /* Was any thread of this process doing a displaced step? */
1800 if (displaced == NULL)
1801 return;
237fc4c9
PA
1802
1803 /* Was this event for the pid we displaced? */
fc1cf338
PA
1804 if (ptid_equal (displaced->step_ptid, null_ptid)
1805 || ! ptid_equal (displaced->step_ptid, event_ptid))
237fc4c9
PA
1806 return;
1807
fc1cf338 1808 old_cleanups = make_cleanup (displaced_step_clear_cleanup, displaced);
237fc4c9 1809
e2d96639 1810 displaced_step_restore (displaced, displaced->step_ptid);
237fc4c9 1811
cb71640d
PA
1812 /* Fixup may need to read memory/registers. Switch to the thread
1813 that we're fixing up. Also, target_stopped_by_watchpoint checks
1814 the current thread. */
1815 switch_to_thread (event_ptid);
1816
237fc4c9 1817 /* Did the instruction complete successfully? */
cb71640d
PA
1818 if (signal == GDB_SIGNAL_TRAP
1819 && !(target_stopped_by_watchpoint ()
1820 && (gdbarch_have_nonsteppable_watchpoint (displaced->step_gdbarch)
1821 || target_have_steppable_watchpoint)))
237fc4c9
PA
1822 {
1823 /* Fix up the resulting state. */
fc1cf338
PA
1824 gdbarch_displaced_step_fixup (displaced->step_gdbarch,
1825 displaced->step_closure,
1826 displaced->step_original,
1827 displaced->step_copy,
1828 get_thread_regcache (displaced->step_ptid));
237fc4c9
PA
1829 }
1830 else
1831 {
1832 /* Since the instruction didn't complete, all we can do is
1833 relocate the PC. */
515630c5
UW
1834 struct regcache *regcache = get_thread_regcache (event_ptid);
1835 CORE_ADDR pc = regcache_read_pc (regcache);
abbb1732 1836
fc1cf338 1837 pc = displaced->step_original + (pc - displaced->step_copy);
515630c5 1838 regcache_write_pc (regcache, pc);
237fc4c9
PA
1839 }
1840
1841 do_cleanups (old_cleanups);
1842
fc1cf338 1843 displaced->step_ptid = null_ptid;
1c5cfe86 1844
237fc4c9 1845 /* Are there any pending displaced stepping requests? If so, run
fc1cf338
PA
1846 one now. Leave the state object around, since we're likely to
1847 need it again soon. */
1848 while (displaced->step_request_queue)
237fc4c9
PA
1849 {
1850 struct displaced_step_request *head;
1851 ptid_t ptid;
5af949e3 1852 struct regcache *regcache;
929dfd4f 1853 struct gdbarch *gdbarch;
1c5cfe86 1854 CORE_ADDR actual_pc;
6c95b8df 1855 struct address_space *aspace;
237fc4c9 1856
fc1cf338 1857 head = displaced->step_request_queue;
237fc4c9 1858 ptid = head->ptid;
fc1cf338 1859 displaced->step_request_queue = head->next;
237fc4c9
PA
1860 xfree (head);
1861
ad53cd71
PA
1862 context_switch (ptid);
1863
5af949e3
UW
1864 regcache = get_thread_regcache (ptid);
1865 actual_pc = regcache_read_pc (regcache);
6c95b8df 1866 aspace = get_regcache_aspace (regcache);
8550d3b3 1867 gdbarch = get_regcache_arch (regcache);
1c5cfe86 1868
6c95b8df 1869 if (breakpoint_here_p (aspace, actual_pc))
ad53cd71 1870 {
1c5cfe86
PA
1871 if (debug_displaced)
1872 fprintf_unfiltered (gdb_stdlog,
1873 "displaced: stepping queued %s now\n",
1874 target_pid_to_str (ptid));
1875
1876 displaced_step_prepare (ptid);
1877
1878 if (debug_displaced)
1879 {
929dfd4f 1880 CORE_ADDR actual_pc = regcache_read_pc (regcache);
1c5cfe86
PA
1881 gdb_byte buf[4];
1882
5af949e3
UW
1883 fprintf_unfiltered (gdb_stdlog, "displaced: run %s: ",
1884 paddress (gdbarch, actual_pc));
1c5cfe86
PA
1885 read_memory (actual_pc, buf, sizeof (buf));
1886 displaced_step_dump_bytes (gdb_stdlog, buf, sizeof (buf));
1887 }
1888
fc1cf338
PA
1889 if (gdbarch_displaced_step_hw_singlestep (gdbarch,
1890 displaced->step_closure))
a493e3e2 1891 target_resume (ptid, 1, GDB_SIGNAL_0);
99e40580 1892 else
a493e3e2 1893 target_resume (ptid, 0, GDB_SIGNAL_0);
1c5cfe86
PA
1894
1895 /* Done, we're stepping a thread. */
1896 break;
ad53cd71 1897 }
1c5cfe86
PA
1898 else
1899 {
1900 int step;
1901 struct thread_info *tp = inferior_thread ();
1902
1903 /* The breakpoint we were sitting under has since been
1904 removed. */
16c381f0 1905 tp->control.trap_expected = 0;
1c5cfe86
PA
1906
1907 /* Go back to what we were trying to do. */
1908 step = currently_stepping (tp);
ad53cd71 1909
8550d3b3
YQ
1910 if (step)
1911 step = maybe_software_singlestep (gdbarch, actual_pc);
1912
1c5cfe86 1913 if (debug_displaced)
3e43a32a 1914 fprintf_unfiltered (gdb_stdlog,
27d2932e 1915 "displaced: breakpoint is gone: %s, step(%d)\n",
1c5cfe86
PA
1916 target_pid_to_str (tp->ptid), step);
1917
a493e3e2
PA
1918 target_resume (ptid, step, GDB_SIGNAL_0);
1919 tp->suspend.stop_signal = GDB_SIGNAL_0;
1c5cfe86
PA
1920
1921 /* This request was discarded. See if there's any other
1922 thread waiting for its turn. */
1923 }
237fc4c9
PA
1924 }
1925}
1926
5231c1fd
PA
1927/* Update global variables holding ptids to hold NEW_PTID if they were
1928 holding OLD_PTID. */
1929static void
1930infrun_thread_ptid_changed (ptid_t old_ptid, ptid_t new_ptid)
1931{
1932 struct displaced_step_request *it;
fc1cf338 1933 struct displaced_step_inferior_state *displaced;
5231c1fd
PA
1934
1935 if (ptid_equal (inferior_ptid, old_ptid))
1936 inferior_ptid = new_ptid;
1937
fc1cf338
PA
1938 for (displaced = displaced_step_inferior_states;
1939 displaced;
1940 displaced = displaced->next)
1941 {
1942 if (ptid_equal (displaced->step_ptid, old_ptid))
1943 displaced->step_ptid = new_ptid;
1944
1945 for (it = displaced->step_request_queue; it; it = it->next)
1946 if (ptid_equal (it->ptid, old_ptid))
1947 it->ptid = new_ptid;
1948 }
5231c1fd
PA
1949}
1950
237fc4c9
PA
1951\f
1952/* Resuming. */
c906108c
SS
1953
1954/* Things to clean up if we QUIT out of resume (). */
c906108c 1955static void
74b7792f 1956resume_cleanups (void *ignore)
c906108c 1957{
34b7e8a6
PA
1958 if (!ptid_equal (inferior_ptid, null_ptid))
1959 delete_single_step_breakpoints (inferior_thread ());
7c16b83e 1960
c906108c
SS
1961 normal_stop ();
1962}
1963
53904c9e
AC
1964static const char schedlock_off[] = "off";
1965static const char schedlock_on[] = "on";
1966static const char schedlock_step[] = "step";
40478521 1967static const char *const scheduler_enums[] = {
ef346e04
AC
1968 schedlock_off,
1969 schedlock_on,
1970 schedlock_step,
1971 NULL
1972};
920d2a44
AC
1973static const char *scheduler_mode = schedlock_off;
1974static void
1975show_scheduler_mode (struct ui_file *file, int from_tty,
1976 struct cmd_list_element *c, const char *value)
1977{
3e43a32a
MS
1978 fprintf_filtered (file,
1979 _("Mode for locking scheduler "
1980 "during execution is \"%s\".\n"),
920d2a44
AC
1981 value);
1982}
c906108c
SS
1983
1984static void
96baa820 1985set_schedlock_func (char *args, int from_tty, struct cmd_list_element *c)
c906108c 1986{
eefe576e
AC
1987 if (!target_can_lock_scheduler)
1988 {
1989 scheduler_mode = schedlock_off;
1990 error (_("Target '%s' cannot support this command."), target_shortname);
1991 }
c906108c
SS
1992}
1993
d4db2f36
PA
1994/* True if execution commands resume all threads of all processes by
1995 default; otherwise, resume only threads of the current inferior
1996 process. */
1997int sched_multi = 0;
1998
2facfe5c
DD
1999/* Try to setup for software single stepping over the specified location.
2000 Return 1 if target_resume() should use hardware single step.
2001
2002 GDBARCH the current gdbarch.
2003 PC the location to step over. */
2004
2005static int
2006maybe_software_singlestep (struct gdbarch *gdbarch, CORE_ADDR pc)
2007{
2008 int hw_step = 1;
2009
f02253f1
HZ
2010 if (execution_direction == EXEC_FORWARD
2011 && gdbarch_software_single_step_p (gdbarch)
99e40580 2012 && gdbarch_software_single_step (gdbarch, get_current_frame ()))
2facfe5c 2013 {
99e40580 2014 hw_step = 0;
2facfe5c
DD
2015 }
2016 return hw_step;
2017}
c906108c 2018
f3263aa4
PA
2019/* See infrun.h. */
2020
09cee04b
PA
2021ptid_t
2022user_visible_resume_ptid (int step)
2023{
f3263aa4 2024 ptid_t resume_ptid;
09cee04b 2025
09cee04b
PA
2026 if (non_stop)
2027 {
2028 /* With non-stop mode on, threads are always handled
2029 individually. */
2030 resume_ptid = inferior_ptid;
2031 }
2032 else if ((scheduler_mode == schedlock_on)
03d46957 2033 || (scheduler_mode == schedlock_step && step))
09cee04b 2034 {
f3263aa4
PA
2035 /* User-settable 'scheduler' mode requires solo thread
2036 resume. */
09cee04b
PA
2037 resume_ptid = inferior_ptid;
2038 }
f3263aa4
PA
2039 else if (!sched_multi && target_supports_multi_process ())
2040 {
2041 /* Resume all threads of the current process (and none of other
2042 processes). */
2043 resume_ptid = pid_to_ptid (ptid_get_pid (inferior_ptid));
2044 }
2045 else
2046 {
2047 /* Resume all threads of all processes. */
2048 resume_ptid = RESUME_ALL;
2049 }
09cee04b
PA
2050
2051 return resume_ptid;
2052}
2053
64ce06e4
PA
2054/* Wrapper for target_resume, that handles infrun-specific
2055 bookkeeping. */
2056
2057static void
2058do_target_resume (ptid_t resume_ptid, int step, enum gdb_signal sig)
2059{
2060 struct thread_info *tp = inferior_thread ();
2061
2062 /* Install inferior's terminal modes. */
2063 target_terminal_inferior ();
2064
2065 /* Avoid confusing the next resume, if the next stop/resume
2066 happens to apply to another thread. */
2067 tp->suspend.stop_signal = GDB_SIGNAL_0;
2068
8f572e5c
PA
2069 /* Advise target which signals may be handled silently.
2070
2071 If we have removed breakpoints because we are stepping over one
2072 in-line (in any thread), we need to receive all signals to avoid
2073 accidentally skipping a breakpoint during execution of a signal
2074 handler.
2075
2076 Likewise if we're displaced stepping, otherwise a trap for a
2077 breakpoint in a signal handler might be confused with the
2078 displaced step finishing. We don't make the displaced_step_fixup
2079 step distinguish the cases instead, because:
2080
2081 - a backtrace while stopped in the signal handler would show the
2082 scratch pad as frame older than the signal handler, instead of
2083 the real mainline code.
2084
2085 - when the thread is later resumed, the signal handler would
2086 return to the scratch pad area, which would no longer be
2087 valid. */
2088 if (step_over_info_valid_p ()
2089 || displaced_step_in_progress (ptid_get_pid (tp->ptid)))
64ce06e4
PA
2090 target_pass_signals (0, NULL);
2091 else
2092 target_pass_signals ((int) GDB_SIGNAL_LAST, signal_pass);
2093
2094 target_resume (resume_ptid, step, sig);
2095}
2096
c906108c
SS
2097/* Resume the inferior, but allow a QUIT. This is useful if the user
2098 wants to interrupt some lengthy single-stepping operation
2099 (for child processes, the SIGINT goes to the inferior, and so
2100 we get a SIGINT random_signal, but for remote debugging and perhaps
2101 other targets, that's not true).
2102
c906108c
SS
2103 SIG is the signal to give the inferior (zero for none). */
2104void
64ce06e4 2105resume (enum gdb_signal sig)
c906108c 2106{
74b7792f 2107 struct cleanup *old_cleanups = make_cleanup (resume_cleanups, 0);
515630c5
UW
2108 struct regcache *regcache = get_current_regcache ();
2109 struct gdbarch *gdbarch = get_regcache_arch (regcache);
4e1c45ea 2110 struct thread_info *tp = inferior_thread ();
515630c5 2111 CORE_ADDR pc = regcache_read_pc (regcache);
6c95b8df 2112 struct address_space *aspace = get_regcache_aspace (regcache);
b0f16a3e 2113 ptid_t resume_ptid;
856e7dd6
PA
2114 /* This represents the user's step vs continue request. When
2115 deciding whether "set scheduler-locking step" applies, it's the
2116 user's intention that counts. */
2117 const int user_step = tp->control.stepping_command;
64ce06e4
PA
2118 /* This represents what we'll actually request the target to do.
2119 This can decay from a step to a continue, if e.g., we need to
2120 implement single-stepping with breakpoints (software
2121 single-step). */
6b403daa 2122 int step;
c7e8a53c 2123
af48d08f
PA
2124 tp->stepped_breakpoint = 0;
2125
c906108c
SS
2126 QUIT;
2127
6b403daa
PA
2128 /* Depends on stepped_breakpoint. */
2129 step = currently_stepping (tp);
2130
74609e71
YQ
2131 if (current_inferior ()->waiting_for_vfork_done)
2132 {
48f9886d
PA
2133 /* Don't try to single-step a vfork parent that is waiting for
2134 the child to get out of the shared memory region (by exec'ing
2135 or exiting). This is particularly important on software
2136 single-step archs, as the child process would trip on the
2137 software single step breakpoint inserted for the parent
2138 process. Since the parent will not actually execute any
2139 instruction until the child is out of the shared region (such
2140 are vfork's semantics), it is safe to simply continue it.
2141 Eventually, we'll see a TARGET_WAITKIND_VFORK_DONE event for
2142 the parent, and tell it to `keep_going', which automatically
2143 re-sets it stepping. */
74609e71
YQ
2144 if (debug_infrun)
2145 fprintf_unfiltered (gdb_stdlog,
2146 "infrun: resume : clear step\n");
a09dd441 2147 step = 0;
74609e71
YQ
2148 }
2149
527159b7 2150 if (debug_infrun)
237fc4c9 2151 fprintf_unfiltered (gdb_stdlog,
c9737c08 2152 "infrun: resume (step=%d, signal=%s), "
0d9a9a5f 2153 "trap_expected=%d, current thread [%s] at %s\n",
c9737c08
PA
2154 step, gdb_signal_to_symbol_string (sig),
2155 tp->control.trap_expected,
0d9a9a5f
PA
2156 target_pid_to_str (inferior_ptid),
2157 paddress (gdbarch, pc));
c906108c 2158
c2c6d25f
JM
2159 /* Normally, by the time we reach `resume', the breakpoints are either
2160 removed or inserted, as appropriate. The exception is if we're sitting
2161 at a permanent breakpoint; we need to step over it, but permanent
2162 breakpoints can't be removed. So we have to test for it here. */
6c95b8df 2163 if (breakpoint_here_p (aspace, pc) == permanent_breakpoint_here)
6d350bb5 2164 {
af48d08f
PA
2165 if (sig != GDB_SIGNAL_0)
2166 {
2167 /* We have a signal to pass to the inferior. The resume
2168 may, or may not take us to the signal handler. If this
2169 is a step, we'll need to stop in the signal handler, if
2170 there's one, (if the target supports stepping into
2171 handlers), or in the next mainline instruction, if
2172 there's no handler. If this is a continue, we need to be
2173 sure to run the handler with all breakpoints inserted.
2174 In all cases, set a breakpoint at the current address
2175 (where the handler returns to), and once that breakpoint
2176 is hit, resume skipping the permanent breakpoint. If
2177 that breakpoint isn't hit, then we've stepped into the
2178 signal handler (or hit some other event). We'll delete
2179 the step-resume breakpoint then. */
2180
2181 if (debug_infrun)
2182 fprintf_unfiltered (gdb_stdlog,
2183 "infrun: resume: skipping permanent breakpoint, "
2184 "deliver signal first\n");
2185
2186 clear_step_over_info ();
2187 tp->control.trap_expected = 0;
2188
2189 if (tp->control.step_resume_breakpoint == NULL)
2190 {
2191 /* Set a "high-priority" step-resume, as we don't want
2192 user breakpoints at PC to trigger (again) when this
2193 hits. */
2194 insert_hp_step_resume_breakpoint_at_frame (get_current_frame ());
2195 gdb_assert (tp->control.step_resume_breakpoint->loc->permanent);
2196
2197 tp->step_after_step_resume_breakpoint = step;
2198 }
2199
2200 insert_breakpoints ();
2201 }
2202 else
2203 {
2204 /* There's no signal to pass, we can go ahead and skip the
2205 permanent breakpoint manually. */
2206 if (debug_infrun)
2207 fprintf_unfiltered (gdb_stdlog,
2208 "infrun: resume: skipping permanent breakpoint\n");
2209 gdbarch_skip_permanent_breakpoint (gdbarch, regcache);
2210 /* Update pc to reflect the new address from which we will
2211 execute instructions. */
2212 pc = regcache_read_pc (regcache);
2213
2214 if (step)
2215 {
2216 /* We've already advanced the PC, so the stepping part
2217 is done. Now we need to arrange for a trap to be
2218 reported to handle_inferior_event. Set a breakpoint
2219 at the current PC, and run to it. Don't update
2220 prev_pc, because if we end in
44a1ee51
PA
2221 switch_back_to_stepped_thread, we want the "expected
2222 thread advanced also" branch to be taken. IOW, we
2223 don't want this thread to step further from PC
af48d08f 2224 (overstep). */
1ac806b8 2225 gdb_assert (!step_over_info_valid_p ());
af48d08f
PA
2226 insert_single_step_breakpoint (gdbarch, aspace, pc);
2227 insert_breakpoints ();
2228
856e7dd6 2229 resume_ptid = user_visible_resume_ptid (user_step);
1ac806b8 2230 do_target_resume (resume_ptid, 0, GDB_SIGNAL_0);
af48d08f
PA
2231 discard_cleanups (old_cleanups);
2232 return;
2233 }
2234 }
6d350bb5 2235 }
c2c6d25f 2236
c1e36e3e
PA
2237 /* If we have a breakpoint to step over, make sure to do a single
2238 step only. Same if we have software watchpoints. */
2239 if (tp->control.trap_expected || bpstat_should_step ())
2240 tp->control.may_range_step = 0;
2241
237fc4c9
PA
2242 /* If enabled, step over breakpoints by executing a copy of the
2243 instruction at a different address.
2244
2245 We can't use displaced stepping when we have a signal to deliver;
2246 the comments for displaced_step_prepare explain why. The
2247 comments in the handle_inferior event for dealing with 'random
74609e71
YQ
2248 signals' explain what we do instead.
2249
2250 We can't use displaced stepping when we are waiting for vfork_done
2251 event, displaced stepping breaks the vfork child similarly as single
2252 step software breakpoint. */
515630c5 2253 if (use_displaced_stepping (gdbarch)
36728e82 2254 && tp->control.trap_expected
cb71640d 2255 && !step_over_info_valid_p ()
a493e3e2 2256 && sig == GDB_SIGNAL_0
74609e71 2257 && !current_inferior ()->waiting_for_vfork_done)
237fc4c9 2258 {
fc1cf338
PA
2259 struct displaced_step_inferior_state *displaced;
2260
237fc4c9 2261 if (!displaced_step_prepare (inferior_ptid))
d56b7306
VP
2262 {
2263 /* Got placed in displaced stepping queue. Will be resumed
2264 later when all the currently queued displaced stepping
251bde03
PA
2265 requests finish. The thread is not executing at this
2266 point, and the call to set_executing will be made later.
2267 But we need to call set_running here, since from the
2268 user/frontend's point of view, threads were set running.
2269 Unless we're calling an inferior function, as in that
2270 case we pretend the inferior doesn't run at all. */
2271 if (!tp->control.in_infcall)
856e7dd6 2272 set_running (user_visible_resume_ptid (user_step), 1);
d56b7306
VP
2273 discard_cleanups (old_cleanups);
2274 return;
2275 }
99e40580 2276
ca7781d2
LM
2277 /* Update pc to reflect the new address from which we will execute
2278 instructions due to displaced stepping. */
2279 pc = regcache_read_pc (get_thread_regcache (inferior_ptid));
2280
fc1cf338 2281 displaced = get_displaced_stepping_state (ptid_get_pid (inferior_ptid));
a09dd441
PA
2282 step = gdbarch_displaced_step_hw_singlestep (gdbarch,
2283 displaced->step_closure);
237fc4c9
PA
2284 }
2285
2facfe5c 2286 /* Do we need to do it the hard way, w/temp breakpoints? */
99e40580 2287 else if (step)
2facfe5c 2288 step = maybe_software_singlestep (gdbarch, pc);
c906108c 2289
30852783
UW
2290 /* Currently, our software single-step implementation leads to different
2291 results than hardware single-stepping in one situation: when stepping
2292 into delivering a signal which has an associated signal handler,
2293 hardware single-step will stop at the first instruction of the handler,
2294 while software single-step will simply skip execution of the handler.
2295
2296 For now, this difference in behavior is accepted since there is no
2297 easy way to actually implement single-stepping into a signal handler
2298 without kernel support.
2299
2300 However, there is one scenario where this difference leads to follow-on
2301 problems: if we're stepping off a breakpoint by removing all breakpoints
2302 and then single-stepping. In this case, the software single-step
2303 behavior means that even if there is a *breakpoint* in the signal
2304 handler, GDB still would not stop.
2305
2306 Fortunately, we can at least fix this particular issue. We detect
2307 here the case where we are about to deliver a signal while software
2308 single-stepping with breakpoints removed. In this situation, we
2309 revert the decisions to remove all breakpoints and insert single-
2310 step breakpoints, and instead we install a step-resume breakpoint
2311 at the current address, deliver the signal without stepping, and
2312 once we arrive back at the step-resume breakpoint, actually step
2313 over the breakpoint we originally wanted to step over. */
34b7e8a6 2314 if (thread_has_single_step_breakpoints_set (tp)
6cc83d2a
PA
2315 && sig != GDB_SIGNAL_0
2316 && step_over_info_valid_p ())
30852783
UW
2317 {
2318 /* If we have nested signals or a pending signal is delivered
2319 immediately after a handler returns, might might already have
2320 a step-resume breakpoint set on the earlier handler. We cannot
2321 set another step-resume breakpoint; just continue on until the
2322 original breakpoint is hit. */
2323 if (tp->control.step_resume_breakpoint == NULL)
2324 {
2c03e5be 2325 insert_hp_step_resume_breakpoint_at_frame (get_current_frame ());
30852783
UW
2326 tp->step_after_step_resume_breakpoint = 1;
2327 }
2328
34b7e8a6 2329 delete_single_step_breakpoints (tp);
30852783 2330
31e77af2 2331 clear_step_over_info ();
30852783 2332 tp->control.trap_expected = 0;
31e77af2
PA
2333
2334 insert_breakpoints ();
30852783
UW
2335 }
2336
b0f16a3e
SM
2337 /* If STEP is set, it's a request to use hardware stepping
2338 facilities. But in that case, we should never
2339 use singlestep breakpoint. */
34b7e8a6 2340 gdb_assert (!(thread_has_single_step_breakpoints_set (tp) && step));
dfcd3bfb 2341
b0f16a3e
SM
2342 /* Decide the set of threads to ask the target to resume. Start
2343 by assuming everything will be resumed, than narrow the set
2344 by applying increasingly restricting conditions. */
856e7dd6 2345 resume_ptid = user_visible_resume_ptid (user_step);
cd76b0b7 2346
251bde03
PA
2347 /* Even if RESUME_PTID is a wildcard, and we end up resuming less
2348 (e.g., we might need to step over a breakpoint), from the
2349 user/frontend's point of view, all threads in RESUME_PTID are now
2350 running. Unless we're calling an inferior function, as in that
2351 case pretend we inferior doesn't run at all. */
2352 if (!tp->control.in_infcall)
2353 set_running (resume_ptid, 1);
2354
b0f16a3e 2355 /* Maybe resume a single thread after all. */
34b7e8a6 2356 if ((step || thread_has_single_step_breakpoints_set (tp))
b0f16a3e
SM
2357 && tp->control.trap_expected)
2358 {
2359 /* We're allowing a thread to run past a breakpoint it has
2360 hit, by single-stepping the thread with the breakpoint
2361 removed. In which case, we need to single-step only this
2362 thread, and keep others stopped, as they can miss this
2363 breakpoint if allowed to run. */
2364 resume_ptid = inferior_ptid;
2365 }
d4db2f36 2366
7f5ef605
PA
2367 if (execution_direction != EXEC_REVERSE
2368 && step && breakpoint_inserted_here_p (aspace, pc))
b0f16a3e 2369 {
7f5ef605
PA
2370 /* The only case we currently need to step a breakpoint
2371 instruction is when we have a signal to deliver. See
2372 handle_signal_stop where we handle random signals that could
2373 take out us out of the stepping range. Normally, in that
2374 case we end up continuing (instead of stepping) over the
2375 signal handler with a breakpoint at PC, but there are cases
2376 where we should _always_ single-step, even if we have a
2377 step-resume breakpoint, like when a software watchpoint is
2378 set. Assuming single-stepping and delivering a signal at the
2379 same time would takes us to the signal handler, then we could
2380 have removed the breakpoint at PC to step over it. However,
2381 some hardware step targets (like e.g., Mac OS) can't step
2382 into signal handlers, and for those, we need to leave the
2383 breakpoint at PC inserted, as otherwise if the handler
2384 recurses and executes PC again, it'll miss the breakpoint.
2385 So we leave the breakpoint inserted anyway, but we need to
2386 record that we tried to step a breakpoint instruction, so
2387 that adjust_pc_after_break doesn't end up confused. */
2388 gdb_assert (sig != GDB_SIGNAL_0);
2389
2390 tp->stepped_breakpoint = 1;
2391
b0f16a3e
SM
2392 /* Most targets can step a breakpoint instruction, thus
2393 executing it normally. But if this one cannot, just
2394 continue and we will hit it anyway. */
7f5ef605 2395 if (gdbarch_cannot_step_breakpoint (gdbarch))
b0f16a3e
SM
2396 step = 0;
2397 }
ef5cf84e 2398
b0f16a3e
SM
2399 if (debug_displaced
2400 && use_displaced_stepping (gdbarch)
cb71640d
PA
2401 && tp->control.trap_expected
2402 && !step_over_info_valid_p ())
b0f16a3e 2403 {
d9b67d9f 2404 struct regcache *resume_regcache = get_thread_regcache (tp->ptid);
b0f16a3e
SM
2405 struct gdbarch *resume_gdbarch = get_regcache_arch (resume_regcache);
2406 CORE_ADDR actual_pc = regcache_read_pc (resume_regcache);
2407 gdb_byte buf[4];
2408
2409 fprintf_unfiltered (gdb_stdlog, "displaced: run %s: ",
2410 paddress (resume_gdbarch, actual_pc));
2411 read_memory (actual_pc, buf, sizeof (buf));
2412 displaced_step_dump_bytes (gdb_stdlog, buf, sizeof (buf));
2413 }
237fc4c9 2414
b0f16a3e
SM
2415 if (tp->control.may_range_step)
2416 {
2417 /* If we're resuming a thread with the PC out of the step
2418 range, then we're doing some nested/finer run control
2419 operation, like stepping the thread out of the dynamic
2420 linker or the displaced stepping scratch pad. We
2421 shouldn't have allowed a range step then. */
2422 gdb_assert (pc_in_thread_step_range (pc, tp));
2423 }
c1e36e3e 2424
64ce06e4 2425 do_target_resume (resume_ptid, step, sig);
c906108c
SS
2426 discard_cleanups (old_cleanups);
2427}
2428\f
237fc4c9 2429/* Proceeding. */
c906108c
SS
2430
2431/* Clear out all variables saying what to do when inferior is continued.
2432 First do this, then set the ones you want, then call `proceed'. */
2433
a7212384
UW
2434static void
2435clear_proceed_status_thread (struct thread_info *tp)
c906108c 2436{
a7212384
UW
2437 if (debug_infrun)
2438 fprintf_unfiltered (gdb_stdlog,
2439 "infrun: clear_proceed_status_thread (%s)\n",
2440 target_pid_to_str (tp->ptid));
d6b48e9c 2441
70509625
PA
2442 /* If this signal should not be seen by program, give it zero.
2443 Used for debugging signals. */
2444 if (!signal_pass_state (tp->suspend.stop_signal))
2445 tp->suspend.stop_signal = GDB_SIGNAL_0;
2446
16c381f0
JK
2447 tp->control.trap_expected = 0;
2448 tp->control.step_range_start = 0;
2449 tp->control.step_range_end = 0;
c1e36e3e 2450 tp->control.may_range_step = 0;
16c381f0
JK
2451 tp->control.step_frame_id = null_frame_id;
2452 tp->control.step_stack_frame_id = null_frame_id;
2453 tp->control.step_over_calls = STEP_OVER_UNDEBUGGABLE;
885eeb5b 2454 tp->control.step_start_function = NULL;
a7212384 2455 tp->stop_requested = 0;
4e1c45ea 2456
16c381f0 2457 tp->control.stop_step = 0;
32400beb 2458
16c381f0 2459 tp->control.proceed_to_finish = 0;
414c69f7 2460
17b2616c 2461 tp->control.command_interp = NULL;
856e7dd6 2462 tp->control.stepping_command = 0;
17b2616c 2463
a7212384 2464 /* Discard any remaining commands or status from previous stop. */
16c381f0 2465 bpstat_clear (&tp->control.stop_bpstat);
a7212384 2466}
32400beb 2467
a7212384 2468void
70509625 2469clear_proceed_status (int step)
a7212384 2470{
6c95b8df
PA
2471 if (!non_stop)
2472 {
70509625
PA
2473 struct thread_info *tp;
2474 ptid_t resume_ptid;
2475
2476 resume_ptid = user_visible_resume_ptid (step);
2477
2478 /* In all-stop mode, delete the per-thread status of all threads
2479 we're about to resume, implicitly and explicitly. */
2480 ALL_NON_EXITED_THREADS (tp)
2481 {
2482 if (!ptid_match (tp->ptid, resume_ptid))
2483 continue;
2484 clear_proceed_status_thread (tp);
2485 }
6c95b8df
PA
2486 }
2487
a7212384
UW
2488 if (!ptid_equal (inferior_ptid, null_ptid))
2489 {
2490 struct inferior *inferior;
2491
2492 if (non_stop)
2493 {
6c95b8df
PA
2494 /* If in non-stop mode, only delete the per-thread status of
2495 the current thread. */
a7212384
UW
2496 clear_proceed_status_thread (inferior_thread ());
2497 }
6c95b8df 2498
d6b48e9c 2499 inferior = current_inferior ();
16c381f0 2500 inferior->control.stop_soon = NO_STOP_QUIETLY;
4e1c45ea
PA
2501 }
2502
c906108c 2503 stop_after_trap = 0;
f3b1572e 2504
31e77af2
PA
2505 clear_step_over_info ();
2506
f3b1572e 2507 observer_notify_about_to_proceed ();
c906108c 2508
d5c31457
UW
2509 if (stop_registers)
2510 {
2511 regcache_xfree (stop_registers);
2512 stop_registers = NULL;
2513 }
c906108c
SS
2514}
2515
99619bea
PA
2516/* Returns true if TP is still stopped at a breakpoint that needs
2517 stepping-over in order to make progress. If the breakpoint is gone
2518 meanwhile, we can skip the whole step-over dance. */
ea67f13b
DJ
2519
2520static int
99619bea
PA
2521thread_still_needs_step_over (struct thread_info *tp)
2522{
2523 if (tp->stepping_over_breakpoint)
2524 {
2525 struct regcache *regcache = get_thread_regcache (tp->ptid);
2526
2527 if (breakpoint_here_p (get_regcache_aspace (regcache),
af48d08f
PA
2528 regcache_read_pc (regcache))
2529 == ordinary_breakpoint_here)
99619bea
PA
2530 return 1;
2531
2532 tp->stepping_over_breakpoint = 0;
2533 }
2534
2535 return 0;
2536}
2537
483805cf
PA
2538/* Returns true if scheduler locking applies. STEP indicates whether
2539 we're about to do a step/next-like command to a thread. */
2540
2541static int
856e7dd6 2542schedlock_applies (struct thread_info *tp)
483805cf
PA
2543{
2544 return (scheduler_mode == schedlock_on
2545 || (scheduler_mode == schedlock_step
856e7dd6 2546 && tp->control.stepping_command));
483805cf
PA
2547}
2548
99619bea
PA
2549/* Look a thread other than EXCEPT that has previously reported a
2550 breakpoint event, and thus needs a step-over in order to make
856e7dd6 2551 progress. Returns NULL is none is found. */
99619bea
PA
2552
2553static struct thread_info *
856e7dd6 2554find_thread_needs_step_over (struct thread_info *except)
ea67f13b 2555{
99619bea 2556 struct thread_info *tp, *current;
5a437975
DE
2557
2558 /* With non-stop mode on, threads are always handled individually. */
2559 gdb_assert (! non_stop);
ea67f13b 2560
99619bea 2561 current = inferior_thread ();
d4db2f36 2562
99619bea
PA
2563 /* If scheduler locking applies, we can avoid iterating over all
2564 threads. */
856e7dd6 2565 if (schedlock_applies (except))
ea67f13b 2566 {
99619bea
PA
2567 if (except != current
2568 && thread_still_needs_step_over (current))
2569 return current;
515630c5 2570
99619bea
PA
2571 return NULL;
2572 }
0d9a9a5f 2573
034f788c 2574 ALL_NON_EXITED_THREADS (tp)
99619bea
PA
2575 {
2576 /* Ignore the EXCEPT thread. */
2577 if (tp == except)
2578 continue;
2579 /* Ignore threads of processes we're not resuming. */
2580 if (!sched_multi
2581 && ptid_get_pid (tp->ptid) != ptid_get_pid (inferior_ptid))
2582 continue;
2583
2584 if (thread_still_needs_step_over (tp))
2585 return tp;
ea67f13b
DJ
2586 }
2587
99619bea 2588 return NULL;
ea67f13b 2589}
e4846b08 2590
c906108c
SS
2591/* Basic routine for continuing the program in various fashions.
2592
2593 ADDR is the address to resume at, or -1 for resume where stopped.
2594 SIGGNAL is the signal to give it, or 0 for none,
c5aa993b 2595 or -1 for act according to how it stopped.
c906108c 2596 STEP is nonzero if should trap after one instruction.
c5aa993b
JM
2597 -1 means return after that and print nothing.
2598 You should probably set various step_... variables
2599 before calling here, if you are stepping.
c906108c
SS
2600
2601 You should call clear_proceed_status before calling proceed. */
2602
2603void
64ce06e4 2604proceed (CORE_ADDR addr, enum gdb_signal siggnal)
c906108c 2605{
e58b0e63
PA
2606 struct regcache *regcache;
2607 struct gdbarch *gdbarch;
4e1c45ea 2608 struct thread_info *tp;
e58b0e63 2609 CORE_ADDR pc;
6c95b8df 2610 struct address_space *aspace;
c906108c 2611
e58b0e63
PA
2612 /* If we're stopped at a fork/vfork, follow the branch set by the
2613 "set follow-fork-mode" command; otherwise, we'll just proceed
2614 resuming the current thread. */
2615 if (!follow_fork ())
2616 {
2617 /* The target for some reason decided not to resume. */
2618 normal_stop ();
f148b27e
PA
2619 if (target_can_async_p ())
2620 inferior_event_handler (INF_EXEC_COMPLETE, NULL);
e58b0e63
PA
2621 return;
2622 }
2623
842951eb
PA
2624 /* We'll update this if & when we switch to a new thread. */
2625 previous_inferior_ptid = inferior_ptid;
2626
e58b0e63
PA
2627 regcache = get_current_regcache ();
2628 gdbarch = get_regcache_arch (regcache);
6c95b8df 2629 aspace = get_regcache_aspace (regcache);
e58b0e63 2630 pc = regcache_read_pc (regcache);
2adfaa28 2631 tp = inferior_thread ();
e58b0e63 2632
99619bea
PA
2633 /* Fill in with reasonable starting values. */
2634 init_thread_stepping_state (tp);
2635
2acceee2 2636 if (addr == (CORE_ADDR) -1)
c906108c 2637 {
af48d08f
PA
2638 if (pc == stop_pc
2639 && breakpoint_here_p (aspace, pc) == ordinary_breakpoint_here
b2175913 2640 && execution_direction != EXEC_REVERSE)
3352ef37
AC
2641 /* There is a breakpoint at the address we will resume at,
2642 step one instruction before inserting breakpoints so that
2643 we do not stop right away (and report a second hit at this
b2175913
MS
2644 breakpoint).
2645
2646 Note, we don't do this in reverse, because we won't
2647 actually be executing the breakpoint insn anyway.
2648 We'll be (un-)executing the previous instruction. */
99619bea 2649 tp->stepping_over_breakpoint = 1;
515630c5
UW
2650 else if (gdbarch_single_step_through_delay_p (gdbarch)
2651 && gdbarch_single_step_through_delay (gdbarch,
2652 get_current_frame ()))
3352ef37
AC
2653 /* We stepped onto an instruction that needs to be stepped
2654 again before re-inserting the breakpoint, do so. */
99619bea 2655 tp->stepping_over_breakpoint = 1;
c906108c
SS
2656 }
2657 else
2658 {
515630c5 2659 regcache_write_pc (regcache, addr);
c906108c
SS
2660 }
2661
70509625
PA
2662 if (siggnal != GDB_SIGNAL_DEFAULT)
2663 tp->suspend.stop_signal = siggnal;
2664
17b2616c
PA
2665 /* Record the interpreter that issued the execution command that
2666 caused this thread to resume. If the top level interpreter is
2667 MI/async, and the execution command was a CLI command
2668 (next/step/etc.), we'll want to print stop event output to the MI
2669 console channel (the stepped-to line, etc.), as if the user
2670 entered the execution command on a real GDB console. */
2671 inferior_thread ()->control.command_interp = command_interp ();
2672
527159b7 2673 if (debug_infrun)
8a9de0e4 2674 fprintf_unfiltered (gdb_stdlog,
64ce06e4 2675 "infrun: proceed (addr=%s, signal=%s)\n",
c9737c08 2676 paddress (gdbarch, addr),
64ce06e4 2677 gdb_signal_to_symbol_string (siggnal));
527159b7 2678
94cc34af
PA
2679 if (non_stop)
2680 /* In non-stop, each thread is handled individually. The context
2681 must already be set to the right thread here. */
2682 ;
2683 else
2684 {
99619bea
PA
2685 struct thread_info *step_over;
2686
94cc34af
PA
2687 /* In a multi-threaded task we may select another thread and
2688 then continue or step.
c906108c 2689
94cc34af
PA
2690 But if the old thread was stopped at a breakpoint, it will
2691 immediately cause another breakpoint stop without any
2692 execution (i.e. it will report a breakpoint hit incorrectly).
2693 So we must step over it first.
c906108c 2694
99619bea
PA
2695 Look for a thread other than the current (TP) that reported a
2696 breakpoint hit and hasn't been resumed yet since. */
856e7dd6 2697 step_over = find_thread_needs_step_over (tp);
99619bea 2698 if (step_over != NULL)
2adfaa28 2699 {
99619bea
PA
2700 if (debug_infrun)
2701 fprintf_unfiltered (gdb_stdlog,
2702 "infrun: need to step-over [%s] first\n",
2703 target_pid_to_str (step_over->ptid));
2704
2705 /* Store the prev_pc for the stepping thread too, needed by
44a1ee51 2706 switch_back_to_stepped_thread. */
99619bea
PA
2707 tp->prev_pc = regcache_read_pc (get_current_regcache ());
2708 switch_to_thread (step_over->ptid);
2709 tp = step_over;
2adfaa28 2710 }
94cc34af 2711 }
c906108c 2712
31e77af2
PA
2713 /* If we need to step over a breakpoint, and we're not using
2714 displaced stepping to do so, insert all breakpoints (watchpoints,
2715 etc.) but the one we're stepping over, step one instruction, and
2716 then re-insert the breakpoint when that step is finished. */
99619bea 2717 if (tp->stepping_over_breakpoint && !use_displaced_stepping (gdbarch))
30852783 2718 {
31e77af2
PA
2719 struct regcache *regcache = get_current_regcache ();
2720
2721 set_step_over_info (get_regcache_aspace (regcache),
963f9c80 2722 regcache_read_pc (regcache), 0);
30852783 2723 }
31e77af2
PA
2724 else
2725 clear_step_over_info ();
30852783 2726
31e77af2 2727 insert_breakpoints ();
30852783 2728
99619bea
PA
2729 tp->control.trap_expected = tp->stepping_over_breakpoint;
2730
c906108c
SS
2731 annotate_starting ();
2732
2733 /* Make sure that output from GDB appears before output from the
2734 inferior. */
2735 gdb_flush (gdb_stdout);
2736
e4846b08 2737 /* Refresh prev_pc value just prior to resuming. This used to be
22bcd14b 2738 done in stop_waiting, however, setting prev_pc there did not handle
e4846b08
JJ
2739 scenarios such as inferior function calls or returning from
2740 a function via the return command. In those cases, the prev_pc
2741 value was not set properly for subsequent commands. The prev_pc value
2742 is used to initialize the starting line number in the ecs. With an
2743 invalid value, the gdb next command ends up stopping at the position
2744 represented by the next line table entry past our start position.
2745 On platforms that generate one line table entry per line, this
2746 is not a problem. However, on the ia64, the compiler generates
2747 extraneous line table entries that do not increase the line number.
2748 When we issue the gdb next command on the ia64 after an inferior call
2749 or a return command, we often end up a few instructions forward, still
2750 within the original line we started.
2751
d5cd6034
JB
2752 An attempt was made to refresh the prev_pc at the same time the
2753 execution_control_state is initialized (for instance, just before
2754 waiting for an inferior event). But this approach did not work
2755 because of platforms that use ptrace, where the pc register cannot
2756 be read unless the inferior is stopped. At that point, we are not
2757 guaranteed the inferior is stopped and so the regcache_read_pc() call
2758 can fail. Setting the prev_pc value here ensures the value is updated
2759 correctly when the inferior is stopped. */
4e1c45ea 2760 tp->prev_pc = regcache_read_pc (get_current_regcache ());
e4846b08 2761
c906108c 2762 /* Resume inferior. */
64ce06e4 2763 resume (tp->suspend.stop_signal);
c906108c
SS
2764
2765 /* Wait for it to stop (if not standalone)
2766 and in any case decode why it stopped, and act accordingly. */
43ff13b4 2767 /* Do this only if we are not using the event loop, or if the target
1777feb0 2768 does not support asynchronous execution. */
362646f5 2769 if (!target_can_async_p ())
43ff13b4 2770 {
e4c8541f 2771 wait_for_inferior ();
43ff13b4
JM
2772 normal_stop ();
2773 }
c906108c 2774}
c906108c
SS
2775\f
2776
2777/* Start remote-debugging of a machine over a serial link. */
96baa820 2778
c906108c 2779void
8621d6a9 2780start_remote (int from_tty)
c906108c 2781{
d6b48e9c 2782 struct inferior *inferior;
d6b48e9c
PA
2783
2784 inferior = current_inferior ();
16c381f0 2785 inferior->control.stop_soon = STOP_QUIETLY_REMOTE;
43ff13b4 2786
1777feb0 2787 /* Always go on waiting for the target, regardless of the mode. */
6426a772 2788 /* FIXME: cagney/1999-09-23: At present it isn't possible to
7e73cedf 2789 indicate to wait_for_inferior that a target should timeout if
6426a772
JM
2790 nothing is returned (instead of just blocking). Because of this,
2791 targets expecting an immediate response need to, internally, set
2792 things up so that the target_wait() is forced to eventually
1777feb0 2793 timeout. */
6426a772
JM
2794 /* FIXME: cagney/1999-09-24: It isn't possible for target_open() to
2795 differentiate to its caller what the state of the target is after
2796 the initial open has been performed. Here we're assuming that
2797 the target has stopped. It should be possible to eventually have
2798 target_open() return to the caller an indication that the target
2799 is currently running and GDB state should be set to the same as
1777feb0 2800 for an async run. */
e4c8541f 2801 wait_for_inferior ();
8621d6a9
DJ
2802
2803 /* Now that the inferior has stopped, do any bookkeeping like
2804 loading shared libraries. We want to do this before normal_stop,
2805 so that the displayed frame is up to date. */
2806 post_create_inferior (&current_target, from_tty);
2807
6426a772 2808 normal_stop ();
c906108c
SS
2809}
2810
2811/* Initialize static vars when a new inferior begins. */
2812
2813void
96baa820 2814init_wait_for_inferior (void)
c906108c
SS
2815{
2816 /* These are meaningless until the first time through wait_for_inferior. */
c906108c 2817
c906108c
SS
2818 breakpoint_init_inferior (inf_starting);
2819
70509625 2820 clear_proceed_status (0);
9f976b41 2821
ca005067 2822 target_last_wait_ptid = minus_one_ptid;
237fc4c9 2823
842951eb 2824 previous_inferior_ptid = inferior_ptid;
0d1e5fa7 2825
edb3359d
DJ
2826 /* Discard any skipped inlined frames. */
2827 clear_inline_frame_state (minus_one_ptid);
c906108c 2828}
237fc4c9 2829
c906108c 2830\f
0d1e5fa7
PA
2831/* Data to be passed around while handling an event. This data is
2832 discarded between events. */
c5aa993b 2833struct execution_control_state
488f131b 2834{
0d1e5fa7 2835 ptid_t ptid;
4e1c45ea
PA
2836 /* The thread that got the event, if this was a thread event; NULL
2837 otherwise. */
2838 struct thread_info *event_thread;
2839
488f131b 2840 struct target_waitstatus ws;
7e324e48 2841 int stop_func_filled_in;
488f131b
JB
2842 CORE_ADDR stop_func_start;
2843 CORE_ADDR stop_func_end;
2c02bd72 2844 const char *stop_func_name;
488f131b 2845 int wait_some_more;
4f5d7f63 2846
2adfaa28
PA
2847 /* True if the event thread hit the single-step breakpoint of
2848 another thread. Thus the event doesn't cause a stop, the thread
2849 needs to be single-stepped past the single-step breakpoint before
2850 we can switch back to the original stepping thread. */
2851 int hit_singlestep_breakpoint;
488f131b
JB
2852};
2853
ec9499be 2854static void handle_inferior_event (struct execution_control_state *ecs);
cd0fc7c3 2855
568d6575
UW
2856static void handle_step_into_function (struct gdbarch *gdbarch,
2857 struct execution_control_state *ecs);
2858static void handle_step_into_function_backward (struct gdbarch *gdbarch,
2859 struct execution_control_state *ecs);
4f5d7f63 2860static void handle_signal_stop (struct execution_control_state *ecs);
186c406b 2861static void check_exception_resume (struct execution_control_state *,
28106bc2 2862 struct frame_info *);
611c83ae 2863
bdc36728 2864static void end_stepping_range (struct execution_control_state *ecs);
22bcd14b 2865static void stop_waiting (struct execution_control_state *ecs);
104c1213 2866static void prepare_to_wait (struct execution_control_state *ecs);
d4f3574e 2867static void keep_going (struct execution_control_state *ecs);
94c57d6a 2868static void process_event_stop_test (struct execution_control_state *ecs);
c447ac0b 2869static int switch_back_to_stepped_thread (struct execution_control_state *ecs);
104c1213 2870
252fbfc8
PA
2871/* Callback for iterate over threads. If the thread is stopped, but
2872 the user/frontend doesn't know about that yet, go through
2873 normal_stop, as if the thread had just stopped now. ARG points at
2874 a ptid. If PTID is MINUS_ONE_PTID, applies to all threads. If
2875 ptid_is_pid(PTID) is true, applies to all threads of the process
2876 pointed at by PTID. Otherwise, apply only to the thread pointed by
2877 PTID. */
2878
2879static int
2880infrun_thread_stop_requested_callback (struct thread_info *info, void *arg)
2881{
2882 ptid_t ptid = * (ptid_t *) arg;
2883
2884 if ((ptid_equal (info->ptid, ptid)
2885 || ptid_equal (minus_one_ptid, ptid)
2886 || (ptid_is_pid (ptid)
2887 && ptid_get_pid (ptid) == ptid_get_pid (info->ptid)))
2888 && is_running (info->ptid)
2889 && !is_executing (info->ptid))
2890 {
2891 struct cleanup *old_chain;
2892 struct execution_control_state ecss;
2893 struct execution_control_state *ecs = &ecss;
2894
2895 memset (ecs, 0, sizeof (*ecs));
2896
2897 old_chain = make_cleanup_restore_current_thread ();
2898
f15cb84a
YQ
2899 overlay_cache_invalid = 1;
2900 /* Flush target cache before starting to handle each event.
2901 Target was running and cache could be stale. This is just a
2902 heuristic. Running threads may modify target memory, but we
2903 don't get any event. */
2904 target_dcache_invalidate ();
2905
252fbfc8
PA
2906 /* Go through handle_inferior_event/normal_stop, so we always
2907 have consistent output as if the stop event had been
2908 reported. */
2909 ecs->ptid = info->ptid;
e09875d4 2910 ecs->event_thread = find_thread_ptid (info->ptid);
252fbfc8 2911 ecs->ws.kind = TARGET_WAITKIND_STOPPED;
a493e3e2 2912 ecs->ws.value.sig = GDB_SIGNAL_0;
252fbfc8
PA
2913
2914 handle_inferior_event (ecs);
2915
2916 if (!ecs->wait_some_more)
2917 {
2918 struct thread_info *tp;
2919
2920 normal_stop ();
2921
fa4cd53f 2922 /* Finish off the continuations. */
252fbfc8 2923 tp = inferior_thread ();
fa4cd53f
PA
2924 do_all_intermediate_continuations_thread (tp, 1);
2925 do_all_continuations_thread (tp, 1);
252fbfc8
PA
2926 }
2927
2928 do_cleanups (old_chain);
2929 }
2930
2931 return 0;
2932}
2933
2934/* This function is attached as a "thread_stop_requested" observer.
2935 Cleanup local state that assumed the PTID was to be resumed, and
2936 report the stop to the frontend. */
2937
2c0b251b 2938static void
252fbfc8
PA
2939infrun_thread_stop_requested (ptid_t ptid)
2940{
fc1cf338 2941 struct displaced_step_inferior_state *displaced;
252fbfc8
PA
2942
2943 /* PTID was requested to stop. Remove it from the displaced
2944 stepping queue, so we don't try to resume it automatically. */
fc1cf338
PA
2945
2946 for (displaced = displaced_step_inferior_states;
2947 displaced;
2948 displaced = displaced->next)
252fbfc8 2949 {
fc1cf338 2950 struct displaced_step_request *it, **prev_next_p;
252fbfc8 2951
fc1cf338
PA
2952 it = displaced->step_request_queue;
2953 prev_next_p = &displaced->step_request_queue;
2954 while (it)
252fbfc8 2955 {
fc1cf338
PA
2956 if (ptid_match (it->ptid, ptid))
2957 {
2958 *prev_next_p = it->next;
2959 it->next = NULL;
2960 xfree (it);
2961 }
252fbfc8 2962 else
fc1cf338
PA
2963 {
2964 prev_next_p = &it->next;
2965 }
252fbfc8 2966
fc1cf338 2967 it = *prev_next_p;
252fbfc8 2968 }
252fbfc8
PA
2969 }
2970
2971 iterate_over_threads (infrun_thread_stop_requested_callback, &ptid);
2972}
2973
a07daef3
PA
2974static void
2975infrun_thread_thread_exit (struct thread_info *tp, int silent)
2976{
2977 if (ptid_equal (target_last_wait_ptid, tp->ptid))
2978 nullify_last_target_wait_ptid ();
2979}
2980
0cbcdb96
PA
2981/* Delete the step resume, single-step and longjmp/exception resume
2982 breakpoints of TP. */
4e1c45ea 2983
0cbcdb96
PA
2984static void
2985delete_thread_infrun_breakpoints (struct thread_info *tp)
4e1c45ea 2986{
0cbcdb96
PA
2987 delete_step_resume_breakpoint (tp);
2988 delete_exception_resume_breakpoint (tp);
34b7e8a6 2989 delete_single_step_breakpoints (tp);
4e1c45ea
PA
2990}
2991
0cbcdb96
PA
2992/* If the target still has execution, call FUNC for each thread that
2993 just stopped. In all-stop, that's all the non-exited threads; in
2994 non-stop, that's the current thread, only. */
2995
2996typedef void (*for_each_just_stopped_thread_callback_func)
2997 (struct thread_info *tp);
4e1c45ea
PA
2998
2999static void
0cbcdb96 3000for_each_just_stopped_thread (for_each_just_stopped_thread_callback_func func)
4e1c45ea 3001{
0cbcdb96 3002 if (!target_has_execution || ptid_equal (inferior_ptid, null_ptid))
4e1c45ea
PA
3003 return;
3004
3005 if (non_stop)
3006 {
0cbcdb96
PA
3007 /* If in non-stop mode, only the current thread stopped. */
3008 func (inferior_thread ());
4e1c45ea
PA
3009 }
3010 else
0cbcdb96
PA
3011 {
3012 struct thread_info *tp;
3013
3014 /* In all-stop mode, all threads have stopped. */
3015 ALL_NON_EXITED_THREADS (tp)
3016 {
3017 func (tp);
3018 }
3019 }
3020}
3021
3022/* Delete the step resume and longjmp/exception resume breakpoints of
3023 the threads that just stopped. */
3024
3025static void
3026delete_just_stopped_threads_infrun_breakpoints (void)
3027{
3028 for_each_just_stopped_thread (delete_thread_infrun_breakpoints);
34b7e8a6
PA
3029}
3030
3031/* Delete the single-step breakpoints of the threads that just
3032 stopped. */
7c16b83e 3033
34b7e8a6
PA
3034static void
3035delete_just_stopped_threads_single_step_breakpoints (void)
3036{
3037 for_each_just_stopped_thread (delete_single_step_breakpoints);
4e1c45ea
PA
3038}
3039
1777feb0 3040/* A cleanup wrapper. */
4e1c45ea
PA
3041
3042static void
0cbcdb96 3043delete_just_stopped_threads_infrun_breakpoints_cleanup (void *arg)
4e1c45ea 3044{
0cbcdb96 3045 delete_just_stopped_threads_infrun_breakpoints ();
4e1c45ea
PA
3046}
3047
223698f8
DE
3048/* Pretty print the results of target_wait, for debugging purposes. */
3049
3050static void
3051print_target_wait_results (ptid_t waiton_ptid, ptid_t result_ptid,
3052 const struct target_waitstatus *ws)
3053{
3054 char *status_string = target_waitstatus_to_string (ws);
3055 struct ui_file *tmp_stream = mem_fileopen ();
3056 char *text;
223698f8
DE
3057
3058 /* The text is split over several lines because it was getting too long.
3059 Call fprintf_unfiltered (gdb_stdlog) once so that the text is still
3060 output as a unit; we want only one timestamp printed if debug_timestamp
3061 is set. */
3062
3063 fprintf_unfiltered (tmp_stream,
1176ecec
PA
3064 "infrun: target_wait (%d.%ld.%ld",
3065 ptid_get_pid (waiton_ptid),
3066 ptid_get_lwp (waiton_ptid),
3067 ptid_get_tid (waiton_ptid));
dfd4cc63 3068 if (ptid_get_pid (waiton_ptid) != -1)
223698f8
DE
3069 fprintf_unfiltered (tmp_stream,
3070 " [%s]", target_pid_to_str (waiton_ptid));
3071 fprintf_unfiltered (tmp_stream, ", status) =\n");
3072 fprintf_unfiltered (tmp_stream,
1176ecec 3073 "infrun: %d.%ld.%ld [%s],\n",
dfd4cc63 3074 ptid_get_pid (result_ptid),
1176ecec
PA
3075 ptid_get_lwp (result_ptid),
3076 ptid_get_tid (result_ptid),
dfd4cc63 3077 target_pid_to_str (result_ptid));
223698f8
DE
3078 fprintf_unfiltered (tmp_stream,
3079 "infrun: %s\n",
3080 status_string);
3081
759ef836 3082 text = ui_file_xstrdup (tmp_stream, NULL);
223698f8
DE
3083
3084 /* This uses %s in part to handle %'s in the text, but also to avoid
3085 a gcc error: the format attribute requires a string literal. */
3086 fprintf_unfiltered (gdb_stdlog, "%s", text);
3087
3088 xfree (status_string);
3089 xfree (text);
3090 ui_file_delete (tmp_stream);
3091}
3092
24291992
PA
3093/* Prepare and stabilize the inferior for detaching it. E.g.,
3094 detaching while a thread is displaced stepping is a recipe for
3095 crashing it, as nothing would readjust the PC out of the scratch
3096 pad. */
3097
3098void
3099prepare_for_detach (void)
3100{
3101 struct inferior *inf = current_inferior ();
3102 ptid_t pid_ptid = pid_to_ptid (inf->pid);
3103 struct cleanup *old_chain_1;
3104 struct displaced_step_inferior_state *displaced;
3105
3106 displaced = get_displaced_stepping_state (inf->pid);
3107
3108 /* Is any thread of this process displaced stepping? If not,
3109 there's nothing else to do. */
3110 if (displaced == NULL || ptid_equal (displaced->step_ptid, null_ptid))
3111 return;
3112
3113 if (debug_infrun)
3114 fprintf_unfiltered (gdb_stdlog,
3115 "displaced-stepping in-process while detaching");
3116
3117 old_chain_1 = make_cleanup_restore_integer (&inf->detaching);
3118 inf->detaching = 1;
3119
3120 while (!ptid_equal (displaced->step_ptid, null_ptid))
3121 {
3122 struct cleanup *old_chain_2;
3123 struct execution_control_state ecss;
3124 struct execution_control_state *ecs;
3125
3126 ecs = &ecss;
3127 memset (ecs, 0, sizeof (*ecs));
3128
3129 overlay_cache_invalid = 1;
f15cb84a
YQ
3130 /* Flush target cache before starting to handle each event.
3131 Target was running and cache could be stale. This is just a
3132 heuristic. Running threads may modify target memory, but we
3133 don't get any event. */
3134 target_dcache_invalidate ();
24291992 3135
24291992
PA
3136 if (deprecated_target_wait_hook)
3137 ecs->ptid = deprecated_target_wait_hook (pid_ptid, &ecs->ws, 0);
3138 else
3139 ecs->ptid = target_wait (pid_ptid, &ecs->ws, 0);
3140
3141 if (debug_infrun)
3142 print_target_wait_results (pid_ptid, ecs->ptid, &ecs->ws);
3143
3144 /* If an error happens while handling the event, propagate GDB's
3145 knowledge of the executing state to the frontend/user running
3146 state. */
3e43a32a
MS
3147 old_chain_2 = make_cleanup (finish_thread_state_cleanup,
3148 &minus_one_ptid);
24291992
PA
3149
3150 /* Now figure out what to do with the result of the result. */
3151 handle_inferior_event (ecs);
3152
3153 /* No error, don't finish the state yet. */
3154 discard_cleanups (old_chain_2);
3155
3156 /* Breakpoints and watchpoints are not installed on the target
3157 at this point, and signals are passed directly to the
3158 inferior, so this must mean the process is gone. */
3159 if (!ecs->wait_some_more)
3160 {
3161 discard_cleanups (old_chain_1);
3162 error (_("Program exited while detaching"));
3163 }
3164 }
3165
3166 discard_cleanups (old_chain_1);
3167}
3168
cd0fc7c3 3169/* Wait for control to return from inferior to debugger.
ae123ec6 3170
cd0fc7c3
SS
3171 If inferior gets a signal, we may decide to start it up again
3172 instead of returning. That is why there is a loop in this function.
3173 When this function actually returns it means the inferior
3174 should be left stopped and GDB should read more commands. */
3175
3176void
e4c8541f 3177wait_for_inferior (void)
cd0fc7c3
SS
3178{
3179 struct cleanup *old_cleanups;
e6f5c25b 3180 struct cleanup *thread_state_chain;
c906108c 3181
527159b7 3182 if (debug_infrun)
ae123ec6 3183 fprintf_unfiltered
e4c8541f 3184 (gdb_stdlog, "infrun: wait_for_inferior ()\n");
527159b7 3185
0cbcdb96
PA
3186 old_cleanups
3187 = make_cleanup (delete_just_stopped_threads_infrun_breakpoints_cleanup,
3188 NULL);
cd0fc7c3 3189
e6f5c25b
PA
3190 /* If an error happens while handling the event, propagate GDB's
3191 knowledge of the executing state to the frontend/user running
3192 state. */
3193 thread_state_chain = make_cleanup (finish_thread_state_cleanup, &minus_one_ptid);
3194
c906108c
SS
3195 while (1)
3196 {
ae25568b
PA
3197 struct execution_control_state ecss;
3198 struct execution_control_state *ecs = &ecss;
963f9c80 3199 ptid_t waiton_ptid = minus_one_ptid;
29f49a6a 3200
ae25568b
PA
3201 memset (ecs, 0, sizeof (*ecs));
3202
ec9499be 3203 overlay_cache_invalid = 1;
ec9499be 3204
f15cb84a
YQ
3205 /* Flush target cache before starting to handle each event.
3206 Target was running and cache could be stale. This is just a
3207 heuristic. Running threads may modify target memory, but we
3208 don't get any event. */
3209 target_dcache_invalidate ();
3210
9a4105ab 3211 if (deprecated_target_wait_hook)
47608cb1 3212 ecs->ptid = deprecated_target_wait_hook (waiton_ptid, &ecs->ws, 0);
cd0fc7c3 3213 else
47608cb1 3214 ecs->ptid = target_wait (waiton_ptid, &ecs->ws, 0);
c906108c 3215
f00150c9 3216 if (debug_infrun)
223698f8 3217 print_target_wait_results (waiton_ptid, ecs->ptid, &ecs->ws);
f00150c9 3218
cd0fc7c3
SS
3219 /* Now figure out what to do with the result of the result. */
3220 handle_inferior_event (ecs);
c906108c 3221
cd0fc7c3
SS
3222 if (!ecs->wait_some_more)
3223 break;
3224 }
4e1c45ea 3225
e6f5c25b
PA
3226 /* No error, don't finish the state yet. */
3227 discard_cleanups (thread_state_chain);
3228
cd0fc7c3
SS
3229 do_cleanups (old_cleanups);
3230}
c906108c 3231
d3d4baed
PA
3232/* Cleanup that reinstalls the readline callback handler, if the
3233 target is running in the background. If while handling the target
3234 event something triggered a secondary prompt, like e.g., a
3235 pagination prompt, we'll have removed the callback handler (see
3236 gdb_readline_wrapper_line). Need to do this as we go back to the
3237 event loop, ready to process further input. Note this has no
3238 effect if the handler hasn't actually been removed, because calling
3239 rl_callback_handler_install resets the line buffer, thus losing
3240 input. */
3241
3242static void
3243reinstall_readline_callback_handler_cleanup (void *arg)
3244{
6c400b59
PA
3245 if (!interpreter_async)
3246 {
3247 /* We're not going back to the top level event loop yet. Don't
3248 install the readline callback, as it'd prep the terminal,
3249 readline-style (raw, noecho) (e.g., --batch). We'll install
3250 it the next time the prompt is displayed, when we're ready
3251 for input. */
3252 return;
3253 }
3254
d3d4baed
PA
3255 if (async_command_editing_p && !sync_execution)
3256 gdb_rl_callback_handler_reinstall ();
3257}
3258
1777feb0 3259/* Asynchronous version of wait_for_inferior. It is called by the
43ff13b4 3260 event loop whenever a change of state is detected on the file
1777feb0
MS
3261 descriptor corresponding to the target. It can be called more than
3262 once to complete a single execution command. In such cases we need
3263 to keep the state in a global variable ECSS. If it is the last time
a474d7c2
PA
3264 that this function is called for a single execution command, then
3265 report to the user that the inferior has stopped, and do the
1777feb0 3266 necessary cleanups. */
43ff13b4
JM
3267
3268void
fba45db2 3269fetch_inferior_event (void *client_data)
43ff13b4 3270{
0d1e5fa7 3271 struct execution_control_state ecss;
a474d7c2 3272 struct execution_control_state *ecs = &ecss;
4f8d22e3 3273 struct cleanup *old_chain = make_cleanup (null_cleanup, NULL);
29f49a6a 3274 struct cleanup *ts_old_chain;
4f8d22e3 3275 int was_sync = sync_execution;
0f641c01 3276 int cmd_done = 0;
963f9c80 3277 ptid_t waiton_ptid = minus_one_ptid;
43ff13b4 3278
0d1e5fa7
PA
3279 memset (ecs, 0, sizeof (*ecs));
3280
d3d4baed
PA
3281 /* End up with readline processing input, if necessary. */
3282 make_cleanup (reinstall_readline_callback_handler_cleanup, NULL);
3283
c5187ac6
PA
3284 /* We're handling a live event, so make sure we're doing live
3285 debugging. If we're looking at traceframes while the target is
3286 running, we're going to need to get back to that mode after
3287 handling the event. */
3288 if (non_stop)
3289 {
3290 make_cleanup_restore_current_traceframe ();
e6e4e701 3291 set_current_traceframe (-1);
c5187ac6
PA
3292 }
3293
4f8d22e3
PA
3294 if (non_stop)
3295 /* In non-stop mode, the user/frontend should not notice a thread
3296 switch due to internal events. Make sure we reverse to the
3297 user selected thread and frame after handling the event and
3298 running any breakpoint commands. */
3299 make_cleanup_restore_current_thread ();
3300
ec9499be 3301 overlay_cache_invalid = 1;
f15cb84a
YQ
3302 /* Flush target cache before starting to handle each event. Target
3303 was running and cache could be stale. This is just a heuristic.
3304 Running threads may modify target memory, but we don't get any
3305 event. */
3306 target_dcache_invalidate ();
3dd5b83d 3307
32231432
PA
3308 make_cleanup_restore_integer (&execution_direction);
3309 execution_direction = target_execution_direction ();
3310
9a4105ab 3311 if (deprecated_target_wait_hook)
a474d7c2 3312 ecs->ptid =
47608cb1 3313 deprecated_target_wait_hook (waiton_ptid, &ecs->ws, TARGET_WNOHANG);
43ff13b4 3314 else
47608cb1 3315 ecs->ptid = target_wait (waiton_ptid, &ecs->ws, TARGET_WNOHANG);
43ff13b4 3316
f00150c9 3317 if (debug_infrun)
223698f8 3318 print_target_wait_results (waiton_ptid, ecs->ptid, &ecs->ws);
f00150c9 3319
29f49a6a
PA
3320 /* If an error happens while handling the event, propagate GDB's
3321 knowledge of the executing state to the frontend/user running
3322 state. */
3323 if (!non_stop)
3324 ts_old_chain = make_cleanup (finish_thread_state_cleanup, &minus_one_ptid);
3325 else
3326 ts_old_chain = make_cleanup (finish_thread_state_cleanup, &ecs->ptid);
3327
353d1d73
JK
3328 /* Get executed before make_cleanup_restore_current_thread above to apply
3329 still for the thread which has thrown the exception. */
3330 make_bpstat_clear_actions_cleanup ();
3331
7c16b83e
PA
3332 make_cleanup (delete_just_stopped_threads_infrun_breakpoints_cleanup, NULL);
3333
43ff13b4 3334 /* Now figure out what to do with the result of the result. */
a474d7c2 3335 handle_inferior_event (ecs);
43ff13b4 3336
a474d7c2 3337 if (!ecs->wait_some_more)
43ff13b4 3338 {
c9657e70 3339 struct inferior *inf = find_inferior_ptid (ecs->ptid);
d6b48e9c 3340
0cbcdb96 3341 delete_just_stopped_threads_infrun_breakpoints ();
f107f563 3342
d6b48e9c 3343 /* We may not find an inferior if this was a process exit. */
16c381f0 3344 if (inf == NULL || inf->control.stop_soon == NO_STOP_QUIETLY)
83c265ab
PA
3345 normal_stop ();
3346
af679fd0 3347 if (target_has_execution
0e5bf2a8 3348 && ecs->ws.kind != TARGET_WAITKIND_NO_RESUMED
af679fd0
PA
3349 && ecs->ws.kind != TARGET_WAITKIND_EXITED
3350 && ecs->ws.kind != TARGET_WAITKIND_SIGNALLED
3351 && ecs->event_thread->step_multi
16c381f0 3352 && ecs->event_thread->control.stop_step)
c2d11a7d
JM
3353 inferior_event_handler (INF_EXEC_CONTINUE, NULL);
3354 else
0f641c01
PA
3355 {
3356 inferior_event_handler (INF_EXEC_COMPLETE, NULL);
3357 cmd_done = 1;
3358 }
43ff13b4 3359 }
4f8d22e3 3360
29f49a6a
PA
3361 /* No error, don't finish the thread states yet. */
3362 discard_cleanups (ts_old_chain);
3363
4f8d22e3
PA
3364 /* Revert thread and frame. */
3365 do_cleanups (old_chain);
3366
3367 /* If the inferior was in sync execution mode, and now isn't,
0f641c01
PA
3368 restore the prompt (a synchronous execution command has finished,
3369 and we're ready for input). */
b4a14fd0 3370 if (interpreter_async && was_sync && !sync_execution)
92bcb5f9 3371 observer_notify_sync_execution_done ();
0f641c01
PA
3372
3373 if (cmd_done
3374 && !was_sync
3375 && exec_done_display_p
3376 && (ptid_equal (inferior_ptid, null_ptid)
3377 || !is_running (inferior_ptid)))
3378 printf_unfiltered (_("completed.\n"));
43ff13b4
JM
3379}
3380
edb3359d
DJ
3381/* Record the frame and location we're currently stepping through. */
3382void
3383set_step_info (struct frame_info *frame, struct symtab_and_line sal)
3384{
3385 struct thread_info *tp = inferior_thread ();
3386
16c381f0
JK
3387 tp->control.step_frame_id = get_frame_id (frame);
3388 tp->control.step_stack_frame_id = get_stack_frame_id (frame);
edb3359d
DJ
3389
3390 tp->current_symtab = sal.symtab;
3391 tp->current_line = sal.line;
3392}
3393
0d1e5fa7
PA
3394/* Clear context switchable stepping state. */
3395
3396void
4e1c45ea 3397init_thread_stepping_state (struct thread_info *tss)
0d1e5fa7 3398{
7f5ef605 3399 tss->stepped_breakpoint = 0;
0d1e5fa7 3400 tss->stepping_over_breakpoint = 0;
963f9c80 3401 tss->stepping_over_watchpoint = 0;
0d1e5fa7 3402 tss->step_after_step_resume_breakpoint = 0;
cd0fc7c3
SS
3403}
3404
c32c64b7
DE
3405/* Set the cached copy of the last ptid/waitstatus. */
3406
3407static void
3408set_last_target_status (ptid_t ptid, struct target_waitstatus status)
3409{
3410 target_last_wait_ptid = ptid;
3411 target_last_waitstatus = status;
3412}
3413
e02bc4cc 3414/* Return the cached copy of the last pid/waitstatus returned by
9a4105ab
AC
3415 target_wait()/deprecated_target_wait_hook(). The data is actually
3416 cached by handle_inferior_event(), which gets called immediately
3417 after target_wait()/deprecated_target_wait_hook(). */
e02bc4cc
DS
3418
3419void
488f131b 3420get_last_target_status (ptid_t *ptidp, struct target_waitstatus *status)
e02bc4cc 3421{
39f77062 3422 *ptidp = target_last_wait_ptid;
e02bc4cc
DS
3423 *status = target_last_waitstatus;
3424}
3425
ac264b3b
MS
3426void
3427nullify_last_target_wait_ptid (void)
3428{
3429 target_last_wait_ptid = minus_one_ptid;
3430}
3431
dcf4fbde 3432/* Switch thread contexts. */
dd80620e
MS
3433
3434static void
0d1e5fa7 3435context_switch (ptid_t ptid)
dd80620e 3436{
4b51d87b 3437 if (debug_infrun && !ptid_equal (ptid, inferior_ptid))
fd48f117
DJ
3438 {
3439 fprintf_unfiltered (gdb_stdlog, "infrun: Switching context from %s ",
3440 target_pid_to_str (inferior_ptid));
3441 fprintf_unfiltered (gdb_stdlog, "to %s\n",
0d1e5fa7 3442 target_pid_to_str (ptid));
fd48f117
DJ
3443 }
3444
0d1e5fa7 3445 switch_to_thread (ptid);
dd80620e
MS
3446}
3447
4fa8626c
DJ
3448static void
3449adjust_pc_after_break (struct execution_control_state *ecs)
3450{
24a73cce
UW
3451 struct regcache *regcache;
3452 struct gdbarch *gdbarch;
6c95b8df 3453 struct address_space *aspace;
118e6252 3454 CORE_ADDR breakpoint_pc, decr_pc;
4fa8626c 3455
4fa8626c
DJ
3456 /* If we've hit a breakpoint, we'll normally be stopped with SIGTRAP. If
3457 we aren't, just return.
9709f61c
DJ
3458
3459 We assume that waitkinds other than TARGET_WAITKIND_STOPPED are not
b798847d
UW
3460 affected by gdbarch_decr_pc_after_break. Other waitkinds which are
3461 implemented by software breakpoints should be handled through the normal
3462 breakpoint layer.
8fb3e588 3463
4fa8626c
DJ
3464 NOTE drow/2004-01-31: On some targets, breakpoints may generate
3465 different signals (SIGILL or SIGEMT for instance), but it is less
3466 clear where the PC is pointing afterwards. It may not match
b798847d
UW
3467 gdbarch_decr_pc_after_break. I don't know any specific target that
3468 generates these signals at breakpoints (the code has been in GDB since at
3469 least 1992) so I can not guess how to handle them here.
8fb3e588 3470
e6cf7916
UW
3471 In earlier versions of GDB, a target with
3472 gdbarch_have_nonsteppable_watchpoint would have the PC after hitting a
b798847d
UW
3473 watchpoint affected by gdbarch_decr_pc_after_break. I haven't found any
3474 target with both of these set in GDB history, and it seems unlikely to be
3475 correct, so gdbarch_have_nonsteppable_watchpoint is not checked here. */
4fa8626c
DJ
3476
3477 if (ecs->ws.kind != TARGET_WAITKIND_STOPPED)
3478 return;
3479
a493e3e2 3480 if (ecs->ws.value.sig != GDB_SIGNAL_TRAP)
4fa8626c
DJ
3481 return;
3482
4058b839
PA
3483 /* In reverse execution, when a breakpoint is hit, the instruction
3484 under it has already been de-executed. The reported PC always
3485 points at the breakpoint address, so adjusting it further would
3486 be wrong. E.g., consider this case on a decr_pc_after_break == 1
3487 architecture:
3488
3489 B1 0x08000000 : INSN1
3490 B2 0x08000001 : INSN2
3491 0x08000002 : INSN3
3492 PC -> 0x08000003 : INSN4
3493
3494 Say you're stopped at 0x08000003 as above. Reverse continuing
3495 from that point should hit B2 as below. Reading the PC when the
3496 SIGTRAP is reported should read 0x08000001 and INSN2 should have
3497 been de-executed already.
3498
3499 B1 0x08000000 : INSN1
3500 B2 PC -> 0x08000001 : INSN2
3501 0x08000002 : INSN3
3502 0x08000003 : INSN4
3503
3504 We can't apply the same logic as for forward execution, because
3505 we would wrongly adjust the PC to 0x08000000, since there's a
3506 breakpoint at PC - 1. We'd then report a hit on B1, although
3507 INSN1 hadn't been de-executed yet. Doing nothing is the correct
3508 behaviour. */
3509 if (execution_direction == EXEC_REVERSE)
3510 return;
3511
1cf4d951
PA
3512 /* If the target can tell whether the thread hit a SW breakpoint,
3513 trust it. Targets that can tell also adjust the PC
3514 themselves. */
3515 if (target_supports_stopped_by_sw_breakpoint ())
3516 return;
3517
3518 /* Note that relying on whether a breakpoint is planted in memory to
3519 determine this can fail. E.g,. the breakpoint could have been
3520 removed since. Or the thread could have been told to step an
3521 instruction the size of a breakpoint instruction, and only
3522 _after_ was a breakpoint inserted at its address. */
3523
24a73cce
UW
3524 /* If this target does not decrement the PC after breakpoints, then
3525 we have nothing to do. */
3526 regcache = get_thread_regcache (ecs->ptid);
3527 gdbarch = get_regcache_arch (regcache);
118e6252 3528
527a273a 3529 decr_pc = gdbarch_decr_pc_after_break (gdbarch);
118e6252 3530 if (decr_pc == 0)
24a73cce
UW
3531 return;
3532
6c95b8df
PA
3533 aspace = get_regcache_aspace (regcache);
3534
8aad930b
AC
3535 /* Find the location where (if we've hit a breakpoint) the
3536 breakpoint would be. */
118e6252 3537 breakpoint_pc = regcache_read_pc (regcache) - decr_pc;
8aad930b 3538
1cf4d951
PA
3539 /* If the target can't tell whether a software breakpoint triggered,
3540 fallback to figuring it out based on breakpoints we think were
3541 inserted in the target, and on whether the thread was stepped or
3542 continued. */
3543
1c5cfe86
PA
3544 /* Check whether there actually is a software breakpoint inserted at
3545 that location.
3546
3547 If in non-stop mode, a race condition is possible where we've
3548 removed a breakpoint, but stop events for that breakpoint were
3549 already queued and arrive later. To suppress those spurious
3550 SIGTRAPs, we keep a list of such breakpoint locations for a bit,
1cf4d951
PA
3551 and retire them after a number of stop events are reported. Note
3552 this is an heuristic and can thus get confused. The real fix is
3553 to get the "stopped by SW BP and needs adjustment" info out of
3554 the target/kernel (and thus never reach here; see above). */
6c95b8df
PA
3555 if (software_breakpoint_inserted_here_p (aspace, breakpoint_pc)
3556 || (non_stop && moribund_breakpoint_here_p (aspace, breakpoint_pc)))
8aad930b 3557 {
77f9e713 3558 struct cleanup *old_cleanups = make_cleanup (null_cleanup, NULL);
abbb1732 3559
8213266a 3560 if (record_full_is_used ())
77f9e713 3561 record_full_gdb_operation_disable_set ();
96429cc8 3562
1c0fdd0e
UW
3563 /* When using hardware single-step, a SIGTRAP is reported for both
3564 a completed single-step and a software breakpoint. Need to
3565 differentiate between the two, as the latter needs adjusting
3566 but the former does not.
3567
3568 The SIGTRAP can be due to a completed hardware single-step only if
3569 - we didn't insert software single-step breakpoints
1c0fdd0e
UW
3570 - this thread is currently being stepped
3571
3572 If any of these events did not occur, we must have stopped due
3573 to hitting a software breakpoint, and have to back up to the
3574 breakpoint address.
3575
3576 As a special case, we could have hardware single-stepped a
3577 software breakpoint. In this case (prev_pc == breakpoint_pc),
3578 we also need to back up to the breakpoint address. */
3579
34b7e8a6 3580 if (thread_has_single_step_breakpoints_set (ecs->event_thread)
4e1c45ea 3581 || !currently_stepping (ecs->event_thread)
7f5ef605
PA
3582 || (ecs->event_thread->stepped_breakpoint
3583 && ecs->event_thread->prev_pc == breakpoint_pc))
515630c5 3584 regcache_write_pc (regcache, breakpoint_pc);
96429cc8 3585
77f9e713 3586 do_cleanups (old_cleanups);
8aad930b 3587 }
4fa8626c
DJ
3588}
3589
edb3359d
DJ
3590static int
3591stepped_in_from (struct frame_info *frame, struct frame_id step_frame_id)
3592{
3593 for (frame = get_prev_frame (frame);
3594 frame != NULL;
3595 frame = get_prev_frame (frame))
3596 {
3597 if (frame_id_eq (get_frame_id (frame), step_frame_id))
3598 return 1;
3599 if (get_frame_type (frame) != INLINE_FRAME)
3600 break;
3601 }
3602
3603 return 0;
3604}
3605
a96d9b2e
SDJ
3606/* Auxiliary function that handles syscall entry/return events.
3607 It returns 1 if the inferior should keep going (and GDB
3608 should ignore the event), or 0 if the event deserves to be
3609 processed. */
ca2163eb 3610
a96d9b2e 3611static int
ca2163eb 3612handle_syscall_event (struct execution_control_state *ecs)
a96d9b2e 3613{
ca2163eb 3614 struct regcache *regcache;
ca2163eb
PA
3615 int syscall_number;
3616
3617 if (!ptid_equal (ecs->ptid, inferior_ptid))
3618 context_switch (ecs->ptid);
3619
3620 regcache = get_thread_regcache (ecs->ptid);
f90263c1 3621 syscall_number = ecs->ws.value.syscall_number;
ca2163eb
PA
3622 stop_pc = regcache_read_pc (regcache);
3623
a96d9b2e
SDJ
3624 if (catch_syscall_enabled () > 0
3625 && catching_syscall_number (syscall_number) > 0)
3626 {
3627 if (debug_infrun)
3628 fprintf_unfiltered (gdb_stdlog, "infrun: syscall number = '%d'\n",
3629 syscall_number);
a96d9b2e 3630
16c381f0 3631 ecs->event_thread->control.stop_bpstat
6c95b8df 3632 = bpstat_stop_status (get_regcache_aspace (regcache),
09ac7c10 3633 stop_pc, ecs->ptid, &ecs->ws);
ab04a2af 3634
ce12b012 3635 if (bpstat_causes_stop (ecs->event_thread->control.stop_bpstat))
ca2163eb
PA
3636 {
3637 /* Catchpoint hit. */
ca2163eb
PA
3638 return 0;
3639 }
a96d9b2e 3640 }
ca2163eb
PA
3641
3642 /* If no catchpoint triggered for this, then keep going. */
ca2163eb
PA
3643 keep_going (ecs);
3644 return 1;
a96d9b2e
SDJ
3645}
3646
7e324e48
GB
3647/* Lazily fill in the execution_control_state's stop_func_* fields. */
3648
3649static void
3650fill_in_stop_func (struct gdbarch *gdbarch,
3651 struct execution_control_state *ecs)
3652{
3653 if (!ecs->stop_func_filled_in)
3654 {
3655 /* Don't care about return value; stop_func_start and stop_func_name
3656 will both be 0 if it doesn't work. */
3657 find_pc_partial_function (stop_pc, &ecs->stop_func_name,
3658 &ecs->stop_func_start, &ecs->stop_func_end);
3659 ecs->stop_func_start
3660 += gdbarch_deprecated_function_start_offset (gdbarch);
3661
591a12a1
UW
3662 if (gdbarch_skip_entrypoint_p (gdbarch))
3663 ecs->stop_func_start = gdbarch_skip_entrypoint (gdbarch,
3664 ecs->stop_func_start);
3665
7e324e48
GB
3666 ecs->stop_func_filled_in = 1;
3667 }
3668}
3669
4f5d7f63
PA
3670
3671/* Return the STOP_SOON field of the inferior pointed at by PTID. */
3672
3673static enum stop_kind
3674get_inferior_stop_soon (ptid_t ptid)
3675{
c9657e70 3676 struct inferior *inf = find_inferior_ptid (ptid);
4f5d7f63
PA
3677
3678 gdb_assert (inf != NULL);
3679 return inf->control.stop_soon;
3680}
3681
05ba8510
PA
3682/* Given an execution control state that has been freshly filled in by
3683 an event from the inferior, figure out what it means and take
3684 appropriate action.
3685
3686 The alternatives are:
3687
22bcd14b 3688 1) stop_waiting and return; to really stop and return to the
05ba8510
PA
3689 debugger.
3690
3691 2) keep_going and return; to wait for the next event (set
3692 ecs->event_thread->stepping_over_breakpoint to 1 to single step
3693 once). */
c906108c 3694
ec9499be 3695static void
96baa820 3696handle_inferior_event (struct execution_control_state *ecs)
cd0fc7c3 3697{
d6b48e9c
PA
3698 enum stop_kind stop_soon;
3699
28736962
PA
3700 if (ecs->ws.kind == TARGET_WAITKIND_IGNORE)
3701 {
3702 /* We had an event in the inferior, but we are not interested in
3703 handling it at this level. The lower layers have already
3704 done what needs to be done, if anything.
3705
3706 One of the possible circumstances for this is when the
3707 inferior produces output for the console. The inferior has
3708 not stopped, and we are ignoring the event. Another possible
3709 circumstance is any event which the lower level knows will be
3710 reported multiple times without an intervening resume. */
3711 if (debug_infrun)
3712 fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_IGNORE\n");
3713 prepare_to_wait (ecs);
3714 return;
3715 }
3716
0e5bf2a8
PA
3717 if (ecs->ws.kind == TARGET_WAITKIND_NO_RESUMED
3718 && target_can_async_p () && !sync_execution)
3719 {
3720 /* There were no unwaited-for children left in the target, but,
3721 we're not synchronously waiting for events either. Just
3722 ignore. Otherwise, if we were running a synchronous
3723 execution command, we need to cancel it and give the user
3724 back the terminal. */
3725 if (debug_infrun)
3726 fprintf_unfiltered (gdb_stdlog,
3727 "infrun: TARGET_WAITKIND_NO_RESUMED (ignoring)\n");
3728 prepare_to_wait (ecs);
3729 return;
3730 }
3731
1777feb0 3732 /* Cache the last pid/waitstatus. */
c32c64b7 3733 set_last_target_status (ecs->ptid, ecs->ws);
e02bc4cc 3734
ca005067 3735 /* Always clear state belonging to the previous time we stopped. */
aa7d318d 3736 stop_stack_dummy = STOP_NONE;
ca005067 3737
0e5bf2a8
PA
3738 if (ecs->ws.kind == TARGET_WAITKIND_NO_RESUMED)
3739 {
3740 /* No unwaited-for children left. IOW, all resumed children
3741 have exited. */
3742 if (debug_infrun)
3743 fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_NO_RESUMED\n");
3744
3745 stop_print_frame = 0;
22bcd14b 3746 stop_waiting (ecs);
0e5bf2a8
PA
3747 return;
3748 }
3749
8c90c137 3750 if (ecs->ws.kind != TARGET_WAITKIND_EXITED
64776a0b 3751 && ecs->ws.kind != TARGET_WAITKIND_SIGNALLED)
359f5fe6
PA
3752 {
3753 ecs->event_thread = find_thread_ptid (ecs->ptid);
3754 /* If it's a new thread, add it to the thread database. */
3755 if (ecs->event_thread == NULL)
3756 ecs->event_thread = add_thread (ecs->ptid);
c1e36e3e
PA
3757
3758 /* Disable range stepping. If the next step request could use a
3759 range, this will be end up re-enabled then. */
3760 ecs->event_thread->control.may_range_step = 0;
359f5fe6 3761 }
88ed393a
JK
3762
3763 /* Dependent on valid ECS->EVENT_THREAD. */
3764 adjust_pc_after_break (ecs);
3765
3766 /* Dependent on the current PC value modified by adjust_pc_after_break. */
3767 reinit_frame_cache ();
3768
28736962
PA
3769 breakpoint_retire_moribund ();
3770
2b009048
DJ
3771 /* First, distinguish signals caused by the debugger from signals
3772 that have to do with the program's own actions. Note that
3773 breakpoint insns may cause SIGTRAP or SIGILL or SIGEMT, depending
3774 on the operating system version. Here we detect when a SIGILL or
3775 SIGEMT is really a breakpoint and change it to SIGTRAP. We do
3776 something similar for SIGSEGV, since a SIGSEGV will be generated
3777 when we're trying to execute a breakpoint instruction on a
3778 non-executable stack. This happens for call dummy breakpoints
3779 for architectures like SPARC that place call dummies on the
3780 stack. */
2b009048 3781 if (ecs->ws.kind == TARGET_WAITKIND_STOPPED
a493e3e2
PA
3782 && (ecs->ws.value.sig == GDB_SIGNAL_ILL
3783 || ecs->ws.value.sig == GDB_SIGNAL_SEGV
3784 || ecs->ws.value.sig == GDB_SIGNAL_EMT))
2b009048 3785 {
de0a0249
UW
3786 struct regcache *regcache = get_thread_regcache (ecs->ptid);
3787
3788 if (breakpoint_inserted_here_p (get_regcache_aspace (regcache),
3789 regcache_read_pc (regcache)))
3790 {
3791 if (debug_infrun)
3792 fprintf_unfiltered (gdb_stdlog,
3793 "infrun: Treating signal as SIGTRAP\n");
a493e3e2 3794 ecs->ws.value.sig = GDB_SIGNAL_TRAP;
de0a0249 3795 }
2b009048
DJ
3796 }
3797
28736962
PA
3798 /* Mark the non-executing threads accordingly. In all-stop, all
3799 threads of all processes are stopped when we get any event
3800 reported. In non-stop mode, only the event thread stops. If
3801 we're handling a process exit in non-stop mode, there's nothing
3802 to do, as threads of the dead process are gone, and threads of
3803 any other process were left running. */
3804 if (!non_stop)
3805 set_executing (minus_one_ptid, 0);
3806 else if (ecs->ws.kind != TARGET_WAITKIND_SIGNALLED
3807 && ecs->ws.kind != TARGET_WAITKIND_EXITED)
7aee8dc2 3808 set_executing (ecs->ptid, 0);
8c90c137 3809
488f131b
JB
3810 switch (ecs->ws.kind)
3811 {
3812 case TARGET_WAITKIND_LOADED:
527159b7 3813 if (debug_infrun)
8a9de0e4 3814 fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_LOADED\n");
5c09a2c5
PA
3815 if (!ptid_equal (ecs->ptid, inferior_ptid))
3816 context_switch (ecs->ptid);
b0f4b84b
DJ
3817 /* Ignore gracefully during startup of the inferior, as it might
3818 be the shell which has just loaded some objects, otherwise
3819 add the symbols for the newly loaded objects. Also ignore at
3820 the beginning of an attach or remote session; we will query
3821 the full list of libraries once the connection is
3822 established. */
4f5d7f63
PA
3823
3824 stop_soon = get_inferior_stop_soon (ecs->ptid);
c0236d92 3825 if (stop_soon == NO_STOP_QUIETLY)
488f131b 3826 {
edcc5120
TT
3827 struct regcache *regcache;
3828
edcc5120
TT
3829 regcache = get_thread_regcache (ecs->ptid);
3830
3831 handle_solib_event ();
3832
3833 ecs->event_thread->control.stop_bpstat
3834 = bpstat_stop_status (get_regcache_aspace (regcache),
3835 stop_pc, ecs->ptid, &ecs->ws);
ab04a2af 3836
ce12b012 3837 if (bpstat_causes_stop (ecs->event_thread->control.stop_bpstat))
edcc5120
TT
3838 {
3839 /* A catchpoint triggered. */
94c57d6a
PA
3840 process_event_stop_test (ecs);
3841 return;
edcc5120 3842 }
488f131b 3843
b0f4b84b
DJ
3844 /* If requested, stop when the dynamic linker notifies
3845 gdb of events. This allows the user to get control
3846 and place breakpoints in initializer routines for
3847 dynamically loaded objects (among other things). */
a493e3e2 3848 ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0;
b0f4b84b
DJ
3849 if (stop_on_solib_events)
3850 {
55409f9d
DJ
3851 /* Make sure we print "Stopped due to solib-event" in
3852 normal_stop. */
3853 stop_print_frame = 1;
3854
22bcd14b 3855 stop_waiting (ecs);
b0f4b84b
DJ
3856 return;
3857 }
488f131b 3858 }
b0f4b84b
DJ
3859
3860 /* If we are skipping through a shell, or through shared library
3861 loading that we aren't interested in, resume the program. If
5c09a2c5 3862 we're running the program normally, also resume. */
b0f4b84b
DJ
3863 if (stop_soon == STOP_QUIETLY || stop_soon == NO_STOP_QUIETLY)
3864 {
74960c60
VP
3865 /* Loading of shared libraries might have changed breakpoint
3866 addresses. Make sure new breakpoints are inserted. */
a25a5a45 3867 if (stop_soon == NO_STOP_QUIETLY)
74960c60 3868 insert_breakpoints ();
64ce06e4 3869 resume (GDB_SIGNAL_0);
b0f4b84b
DJ
3870 prepare_to_wait (ecs);
3871 return;
3872 }
3873
5c09a2c5
PA
3874 /* But stop if we're attaching or setting up a remote
3875 connection. */
3876 if (stop_soon == STOP_QUIETLY_NO_SIGSTOP
3877 || stop_soon == STOP_QUIETLY_REMOTE)
3878 {
3879 if (debug_infrun)
3880 fprintf_unfiltered (gdb_stdlog, "infrun: quietly stopped\n");
22bcd14b 3881 stop_waiting (ecs);
5c09a2c5
PA
3882 return;
3883 }
3884
3885 internal_error (__FILE__, __LINE__,
3886 _("unhandled stop_soon: %d"), (int) stop_soon);
c5aa993b 3887
488f131b 3888 case TARGET_WAITKIND_SPURIOUS:
527159b7 3889 if (debug_infrun)
8a9de0e4 3890 fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_SPURIOUS\n");
64776a0b 3891 if (!ptid_equal (ecs->ptid, inferior_ptid))
8b3ee56d 3892 context_switch (ecs->ptid);
64ce06e4 3893 resume (GDB_SIGNAL_0);
488f131b
JB
3894 prepare_to_wait (ecs);
3895 return;
c5aa993b 3896
488f131b 3897 case TARGET_WAITKIND_EXITED:
940c3c06 3898 case TARGET_WAITKIND_SIGNALLED:
527159b7 3899 if (debug_infrun)
940c3c06
PA
3900 {
3901 if (ecs->ws.kind == TARGET_WAITKIND_EXITED)
3902 fprintf_unfiltered (gdb_stdlog,
3903 "infrun: TARGET_WAITKIND_EXITED\n");
3904 else
3905 fprintf_unfiltered (gdb_stdlog,
3906 "infrun: TARGET_WAITKIND_SIGNALLED\n");
3907 }
3908
fb66883a 3909 inferior_ptid = ecs->ptid;
c9657e70 3910 set_current_inferior (find_inferior_ptid (ecs->ptid));
6c95b8df
PA
3911 set_current_program_space (current_inferior ()->pspace);
3912 handle_vfork_child_exec_or_exit (0);
1777feb0 3913 target_terminal_ours (); /* Must do this before mourn anyway. */
488f131b 3914
0c557179
SDJ
3915 /* Clearing any previous state of convenience variables. */
3916 clear_exit_convenience_vars ();
3917
940c3c06
PA
3918 if (ecs->ws.kind == TARGET_WAITKIND_EXITED)
3919 {
3920 /* Record the exit code in the convenience variable $_exitcode, so
3921 that the user can inspect this again later. */
3922 set_internalvar_integer (lookup_internalvar ("_exitcode"),
3923 (LONGEST) ecs->ws.value.integer);
3924
3925 /* Also record this in the inferior itself. */
3926 current_inferior ()->has_exit_code = 1;
3927 current_inferior ()->exit_code = (LONGEST) ecs->ws.value.integer;
8cf64490 3928
98eb56a4
PA
3929 /* Support the --return-child-result option. */
3930 return_child_result_value = ecs->ws.value.integer;
3931
fd664c91 3932 observer_notify_exited (ecs->ws.value.integer);
940c3c06
PA
3933 }
3934 else
0c557179
SDJ
3935 {
3936 struct regcache *regcache = get_thread_regcache (ecs->ptid);
3937 struct gdbarch *gdbarch = get_regcache_arch (regcache);
3938
3939 if (gdbarch_gdb_signal_to_target_p (gdbarch))
3940 {
3941 /* Set the value of the internal variable $_exitsignal,
3942 which holds the signal uncaught by the inferior. */
3943 set_internalvar_integer (lookup_internalvar ("_exitsignal"),
3944 gdbarch_gdb_signal_to_target (gdbarch,
3945 ecs->ws.value.sig));
3946 }
3947 else
3948 {
3949 /* We don't have access to the target's method used for
3950 converting between signal numbers (GDB's internal
3951 representation <-> target's representation).
3952 Therefore, we cannot do a good job at displaying this
3953 information to the user. It's better to just warn
3954 her about it (if infrun debugging is enabled), and
3955 give up. */
3956 if (debug_infrun)
3957 fprintf_filtered (gdb_stdlog, _("\
3958Cannot fill $_exitsignal with the correct signal number.\n"));
3959 }
3960
fd664c91 3961 observer_notify_signal_exited (ecs->ws.value.sig);
0c557179 3962 }
8cf64490 3963
488f131b
JB
3964 gdb_flush (gdb_stdout);
3965 target_mourn_inferior ();
488f131b 3966 stop_print_frame = 0;
22bcd14b 3967 stop_waiting (ecs);
488f131b 3968 return;
c5aa993b 3969
488f131b 3970 /* The following are the only cases in which we keep going;
1777feb0 3971 the above cases end in a continue or goto. */
488f131b 3972 case TARGET_WAITKIND_FORKED:
deb3b17b 3973 case TARGET_WAITKIND_VFORKED:
527159b7 3974 if (debug_infrun)
fed708ed
PA
3975 {
3976 if (ecs->ws.kind == TARGET_WAITKIND_FORKED)
3977 fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_FORKED\n");
3978 else
3979 fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_VFORKED\n");
3980 }
c906108c 3981
e2d96639
YQ
3982 /* Check whether the inferior is displaced stepping. */
3983 {
3984 struct regcache *regcache = get_thread_regcache (ecs->ptid);
3985 struct gdbarch *gdbarch = get_regcache_arch (regcache);
3986 struct displaced_step_inferior_state *displaced
3987 = get_displaced_stepping_state (ptid_get_pid (ecs->ptid));
3988
3989 /* If checking displaced stepping is supported, and thread
3990 ecs->ptid is displaced stepping. */
3991 if (displaced && ptid_equal (displaced->step_ptid, ecs->ptid))
3992 {
3993 struct inferior *parent_inf
c9657e70 3994 = find_inferior_ptid (ecs->ptid);
e2d96639
YQ
3995 struct regcache *child_regcache;
3996 CORE_ADDR parent_pc;
3997
3998 /* GDB has got TARGET_WAITKIND_FORKED or TARGET_WAITKIND_VFORKED,
3999 indicating that the displaced stepping of syscall instruction
4000 has been done. Perform cleanup for parent process here. Note
4001 that this operation also cleans up the child process for vfork,
4002 because their pages are shared. */
a493e3e2 4003 displaced_step_fixup (ecs->ptid, GDB_SIGNAL_TRAP);
e2d96639
YQ
4004
4005 if (ecs->ws.kind == TARGET_WAITKIND_FORKED)
4006 {
4007 /* Restore scratch pad for child process. */
4008 displaced_step_restore (displaced, ecs->ws.value.related_pid);
4009 }
4010
4011 /* Since the vfork/fork syscall instruction was executed in the scratchpad,
4012 the child's PC is also within the scratchpad. Set the child's PC
4013 to the parent's PC value, which has already been fixed up.
4014 FIXME: we use the parent's aspace here, although we're touching
4015 the child, because the child hasn't been added to the inferior
4016 list yet at this point. */
4017
4018 child_regcache
4019 = get_thread_arch_aspace_regcache (ecs->ws.value.related_pid,
4020 gdbarch,
4021 parent_inf->aspace);
4022 /* Read PC value of parent process. */
4023 parent_pc = regcache_read_pc (regcache);
4024
4025 if (debug_displaced)
4026 fprintf_unfiltered (gdb_stdlog,
4027 "displaced: write child pc from %s to %s\n",
4028 paddress (gdbarch,
4029 regcache_read_pc (child_regcache)),
4030 paddress (gdbarch, parent_pc));
4031
4032 regcache_write_pc (child_regcache, parent_pc);
4033 }
4034 }
4035
5a2901d9 4036 if (!ptid_equal (ecs->ptid, inferior_ptid))
c3a01a22 4037 context_switch (ecs->ptid);
5a2901d9 4038
b242c3c2
PA
4039 /* Immediately detach breakpoints from the child before there's
4040 any chance of letting the user delete breakpoints from the
4041 breakpoint lists. If we don't do this early, it's easy to
4042 leave left over traps in the child, vis: "break foo; catch
4043 fork; c; <fork>; del; c; <child calls foo>". We only follow
4044 the fork on the last `continue', and by that time the
4045 breakpoint at "foo" is long gone from the breakpoint table.
4046 If we vforked, then we don't need to unpatch here, since both
4047 parent and child are sharing the same memory pages; we'll
4048 need to unpatch at follow/detach time instead to be certain
4049 that new breakpoints added between catchpoint hit time and
4050 vfork follow are detached. */
4051 if (ecs->ws.kind != TARGET_WAITKIND_VFORKED)
4052 {
b242c3c2
PA
4053 /* This won't actually modify the breakpoint list, but will
4054 physically remove the breakpoints from the child. */
d80ee84f 4055 detach_breakpoints (ecs->ws.value.related_pid);
b242c3c2
PA
4056 }
4057
34b7e8a6 4058 delete_just_stopped_threads_single_step_breakpoints ();
d03285ec 4059
e58b0e63
PA
4060 /* In case the event is caught by a catchpoint, remember that
4061 the event is to be followed at the next resume of the thread,
4062 and not immediately. */
4063 ecs->event_thread->pending_follow = ecs->ws;
4064
fb14de7b 4065 stop_pc = regcache_read_pc (get_thread_regcache (ecs->ptid));
675bf4cb 4066
16c381f0 4067 ecs->event_thread->control.stop_bpstat
6c95b8df 4068 = bpstat_stop_status (get_regcache_aspace (get_current_regcache ()),
09ac7c10 4069 stop_pc, ecs->ptid, &ecs->ws);
675bf4cb 4070
ce12b012
PA
4071 /* If no catchpoint triggered for this, then keep going. Note
4072 that we're interested in knowing the bpstat actually causes a
4073 stop, not just if it may explain the signal. Software
4074 watchpoints, for example, always appear in the bpstat. */
4075 if (!bpstat_causes_stop (ecs->event_thread->control.stop_bpstat))
04e68871 4076 {
6c95b8df
PA
4077 ptid_t parent;
4078 ptid_t child;
e58b0e63 4079 int should_resume;
3e43a32a
MS
4080 int follow_child
4081 = (follow_fork_mode_string == follow_fork_mode_child);
e58b0e63 4082
a493e3e2 4083 ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0;
e58b0e63
PA
4084
4085 should_resume = follow_fork ();
4086
6c95b8df
PA
4087 parent = ecs->ptid;
4088 child = ecs->ws.value.related_pid;
4089
4090 /* In non-stop mode, also resume the other branch. */
4091 if (non_stop && !detach_fork)
4092 {
4093 if (follow_child)
4094 switch_to_thread (parent);
4095 else
4096 switch_to_thread (child);
4097
4098 ecs->event_thread = inferior_thread ();
4099 ecs->ptid = inferior_ptid;
4100 keep_going (ecs);
4101 }
4102
4103 if (follow_child)
4104 switch_to_thread (child);
4105 else
4106 switch_to_thread (parent);
4107
e58b0e63
PA
4108 ecs->event_thread = inferior_thread ();
4109 ecs->ptid = inferior_ptid;
4110
4111 if (should_resume)
4112 keep_going (ecs);
4113 else
22bcd14b 4114 stop_waiting (ecs);
04e68871
DJ
4115 return;
4116 }
94c57d6a
PA
4117 process_event_stop_test (ecs);
4118 return;
488f131b 4119
6c95b8df
PA
4120 case TARGET_WAITKIND_VFORK_DONE:
4121 /* Done with the shared memory region. Re-insert breakpoints in
4122 the parent, and keep going. */
4123
4124 if (debug_infrun)
3e43a32a
MS
4125 fprintf_unfiltered (gdb_stdlog,
4126 "infrun: TARGET_WAITKIND_VFORK_DONE\n");
6c95b8df
PA
4127
4128 if (!ptid_equal (ecs->ptid, inferior_ptid))
4129 context_switch (ecs->ptid);
4130
4131 current_inferior ()->waiting_for_vfork_done = 0;
56710373 4132 current_inferior ()->pspace->breakpoints_not_allowed = 0;
6c95b8df
PA
4133 /* This also takes care of reinserting breakpoints in the
4134 previously locked inferior. */
4135 keep_going (ecs);
4136 return;
4137
488f131b 4138 case TARGET_WAITKIND_EXECD:
527159b7 4139 if (debug_infrun)
fc5261f2 4140 fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_EXECD\n");
488f131b 4141
5a2901d9 4142 if (!ptid_equal (ecs->ptid, inferior_ptid))
c3a01a22 4143 context_switch (ecs->ptid);
5a2901d9 4144
fb14de7b 4145 stop_pc = regcache_read_pc (get_thread_regcache (ecs->ptid));
795e548f 4146
6c95b8df
PA
4147 /* Do whatever is necessary to the parent branch of the vfork. */
4148 handle_vfork_child_exec_or_exit (1);
4149
795e548f
PA
4150 /* This causes the eventpoints and symbol table to be reset.
4151 Must do this now, before trying to determine whether to
4152 stop. */
71b43ef8 4153 follow_exec (inferior_ptid, ecs->ws.value.execd_pathname);
795e548f 4154
16c381f0 4155 ecs->event_thread->control.stop_bpstat
6c95b8df 4156 = bpstat_stop_status (get_regcache_aspace (get_current_regcache ()),
09ac7c10 4157 stop_pc, ecs->ptid, &ecs->ws);
795e548f 4158
71b43ef8
PA
4159 /* Note that this may be referenced from inside
4160 bpstat_stop_status above, through inferior_has_execd. */
4161 xfree (ecs->ws.value.execd_pathname);
4162 ecs->ws.value.execd_pathname = NULL;
4163
04e68871 4164 /* If no catchpoint triggered for this, then keep going. */
ce12b012 4165 if (!bpstat_causes_stop (ecs->event_thread->control.stop_bpstat))
04e68871 4166 {
a493e3e2 4167 ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0;
04e68871
DJ
4168 keep_going (ecs);
4169 return;
4170 }
94c57d6a
PA
4171 process_event_stop_test (ecs);
4172 return;
488f131b 4173
b4dc5ffa
MK
4174 /* Be careful not to try to gather much state about a thread
4175 that's in a syscall. It's frequently a losing proposition. */
488f131b 4176 case TARGET_WAITKIND_SYSCALL_ENTRY:
527159b7 4177 if (debug_infrun)
3e43a32a
MS
4178 fprintf_unfiltered (gdb_stdlog,
4179 "infrun: TARGET_WAITKIND_SYSCALL_ENTRY\n");
1777feb0 4180 /* Getting the current syscall number. */
94c57d6a
PA
4181 if (handle_syscall_event (ecs) == 0)
4182 process_event_stop_test (ecs);
4183 return;
c906108c 4184
488f131b
JB
4185 /* Before examining the threads further, step this thread to
4186 get it entirely out of the syscall. (We get notice of the
4187 event when the thread is just on the verge of exiting a
4188 syscall. Stepping one instruction seems to get it back
b4dc5ffa 4189 into user code.) */
488f131b 4190 case TARGET_WAITKIND_SYSCALL_RETURN:
527159b7 4191 if (debug_infrun)
3e43a32a
MS
4192 fprintf_unfiltered (gdb_stdlog,
4193 "infrun: TARGET_WAITKIND_SYSCALL_RETURN\n");
94c57d6a
PA
4194 if (handle_syscall_event (ecs) == 0)
4195 process_event_stop_test (ecs);
4196 return;
c906108c 4197
488f131b 4198 case TARGET_WAITKIND_STOPPED:
527159b7 4199 if (debug_infrun)
8a9de0e4 4200 fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_STOPPED\n");
16c381f0 4201 ecs->event_thread->suspend.stop_signal = ecs->ws.value.sig;
4f5d7f63
PA
4202 handle_signal_stop (ecs);
4203 return;
c906108c 4204
b2175913 4205 case TARGET_WAITKIND_NO_HISTORY:
4b4e080e
PA
4206 if (debug_infrun)
4207 fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_NO_HISTORY\n");
b2175913 4208 /* Reverse execution: target ran out of history info. */
eab402df 4209
34b7e8a6 4210 delete_just_stopped_threads_single_step_breakpoints ();
fb14de7b 4211 stop_pc = regcache_read_pc (get_thread_regcache (ecs->ptid));
fd664c91 4212 observer_notify_no_history ();
22bcd14b 4213 stop_waiting (ecs);
b2175913 4214 return;
488f131b 4215 }
4f5d7f63
PA
4216}
4217
4218/* Come here when the program has stopped with a signal. */
4219
4220static void
4221handle_signal_stop (struct execution_control_state *ecs)
4222{
4223 struct frame_info *frame;
4224 struct gdbarch *gdbarch;
4225 int stopped_by_watchpoint;
4226 enum stop_kind stop_soon;
4227 int random_signal;
c906108c 4228
f0407826
DE
4229 gdb_assert (ecs->ws.kind == TARGET_WAITKIND_STOPPED);
4230
4231 /* Do we need to clean up the state of a thread that has
4232 completed a displaced single-step? (Doing so usually affects
4233 the PC, so do it here, before we set stop_pc.) */
4234 displaced_step_fixup (ecs->ptid,
4235 ecs->event_thread->suspend.stop_signal);
4236
4237 /* If we either finished a single-step or hit a breakpoint, but
4238 the user wanted this thread to be stopped, pretend we got a
4239 SIG0 (generic unsignaled stop). */
4240 if (ecs->event_thread->stop_requested
4241 && ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP)
4242 ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0;
237fc4c9 4243
515630c5 4244 stop_pc = regcache_read_pc (get_thread_regcache (ecs->ptid));
488f131b 4245
527159b7 4246 if (debug_infrun)
237fc4c9 4247 {
5af949e3
UW
4248 struct regcache *regcache = get_thread_regcache (ecs->ptid);
4249 struct gdbarch *gdbarch = get_regcache_arch (regcache);
7f82dfc7
JK
4250 struct cleanup *old_chain = save_inferior_ptid ();
4251
4252 inferior_ptid = ecs->ptid;
5af949e3
UW
4253
4254 fprintf_unfiltered (gdb_stdlog, "infrun: stop_pc = %s\n",
4255 paddress (gdbarch, stop_pc));
d92524f1 4256 if (target_stopped_by_watchpoint ())
237fc4c9
PA
4257 {
4258 CORE_ADDR addr;
abbb1732 4259
237fc4c9
PA
4260 fprintf_unfiltered (gdb_stdlog, "infrun: stopped by watchpoint\n");
4261
4262 if (target_stopped_data_address (&current_target, &addr))
4263 fprintf_unfiltered (gdb_stdlog,
5af949e3
UW
4264 "infrun: stopped data address = %s\n",
4265 paddress (gdbarch, addr));
237fc4c9
PA
4266 else
4267 fprintf_unfiltered (gdb_stdlog,
4268 "infrun: (no data address available)\n");
4269 }
7f82dfc7
JK
4270
4271 do_cleanups (old_chain);
237fc4c9 4272 }
527159b7 4273
36fa8042
PA
4274 /* This is originated from start_remote(), start_inferior() and
4275 shared libraries hook functions. */
4276 stop_soon = get_inferior_stop_soon (ecs->ptid);
4277 if (stop_soon == STOP_QUIETLY || stop_soon == STOP_QUIETLY_REMOTE)
4278 {
4279 if (!ptid_equal (ecs->ptid, inferior_ptid))
4280 context_switch (ecs->ptid);
4281 if (debug_infrun)
4282 fprintf_unfiltered (gdb_stdlog, "infrun: quietly stopped\n");
4283 stop_print_frame = 1;
22bcd14b 4284 stop_waiting (ecs);
36fa8042
PA
4285 return;
4286 }
4287
4288 if (ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP
4289 && stop_after_trap)
4290 {
4291 if (!ptid_equal (ecs->ptid, inferior_ptid))
4292 context_switch (ecs->ptid);
4293 if (debug_infrun)
4294 fprintf_unfiltered (gdb_stdlog, "infrun: stopped\n");
4295 stop_print_frame = 0;
22bcd14b 4296 stop_waiting (ecs);
36fa8042
PA
4297 return;
4298 }
4299
4300 /* This originates from attach_command(). We need to overwrite
4301 the stop_signal here, because some kernels don't ignore a
4302 SIGSTOP in a subsequent ptrace(PTRACE_CONT,SIGSTOP) call.
4303 See more comments in inferior.h. On the other hand, if we
4304 get a non-SIGSTOP, report it to the user - assume the backend
4305 will handle the SIGSTOP if it should show up later.
4306
4307 Also consider that the attach is complete when we see a
4308 SIGTRAP. Some systems (e.g. Windows), and stubs supporting
4309 target extended-remote report it instead of a SIGSTOP
4310 (e.g. gdbserver). We already rely on SIGTRAP being our
4311 signal, so this is no exception.
4312
4313 Also consider that the attach is complete when we see a
4314 GDB_SIGNAL_0. In non-stop mode, GDB will explicitly tell
4315 the target to stop all threads of the inferior, in case the
4316 low level attach operation doesn't stop them implicitly. If
4317 they weren't stopped implicitly, then the stub will report a
4318 GDB_SIGNAL_0, meaning: stopped for no particular reason
4319 other than GDB's request. */
4320 if (stop_soon == STOP_QUIETLY_NO_SIGSTOP
4321 && (ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_STOP
4322 || ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP
4323 || ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_0))
4324 {
4325 stop_print_frame = 1;
22bcd14b 4326 stop_waiting (ecs);
36fa8042
PA
4327 ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0;
4328 return;
4329 }
4330
488f131b 4331 /* See if something interesting happened to the non-current thread. If
b40c7d58
DJ
4332 so, then switch to that thread. */
4333 if (!ptid_equal (ecs->ptid, inferior_ptid))
488f131b 4334 {
527159b7 4335 if (debug_infrun)
8a9de0e4 4336 fprintf_unfiltered (gdb_stdlog, "infrun: context switch\n");
527159b7 4337
0d1e5fa7 4338 context_switch (ecs->ptid);
c5aa993b 4339
9a4105ab
AC
4340 if (deprecated_context_hook)
4341 deprecated_context_hook (pid_to_thread_id (ecs->ptid));
488f131b 4342 }
c906108c 4343
568d6575
UW
4344 /* At this point, get hold of the now-current thread's frame. */
4345 frame = get_current_frame ();
4346 gdbarch = get_frame_arch (frame);
4347
2adfaa28 4348 /* Pull the single step breakpoints out of the target. */
af48d08f 4349 if (ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP)
488f131b 4350 {
af48d08f
PA
4351 struct regcache *regcache;
4352 struct address_space *aspace;
4353 CORE_ADDR pc;
2adfaa28 4354
af48d08f
PA
4355 regcache = get_thread_regcache (ecs->ptid);
4356 aspace = get_regcache_aspace (regcache);
4357 pc = regcache_read_pc (regcache);
34b7e8a6 4358
af48d08f
PA
4359 /* However, before doing so, if this single-step breakpoint was
4360 actually for another thread, set this thread up for moving
4361 past it. */
4362 if (!thread_has_single_step_breakpoint_here (ecs->event_thread,
4363 aspace, pc))
4364 {
4365 if (single_step_breakpoint_inserted_here_p (aspace, pc))
2adfaa28
PA
4366 {
4367 if (debug_infrun)
4368 {
4369 fprintf_unfiltered (gdb_stdlog,
af48d08f 4370 "infrun: [%s] hit another thread's "
34b7e8a6
PA
4371 "single-step breakpoint\n",
4372 target_pid_to_str (ecs->ptid));
2adfaa28 4373 }
af48d08f
PA
4374 ecs->hit_singlestep_breakpoint = 1;
4375 }
4376 }
4377 else
4378 {
4379 if (debug_infrun)
4380 {
4381 fprintf_unfiltered (gdb_stdlog,
4382 "infrun: [%s] hit its "
4383 "single-step breakpoint\n",
4384 target_pid_to_str (ecs->ptid));
2adfaa28
PA
4385 }
4386 }
488f131b 4387 }
af48d08f 4388 delete_just_stopped_threads_single_step_breakpoints ();
c906108c 4389
963f9c80
PA
4390 if (ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP
4391 && ecs->event_thread->control.trap_expected
4392 && ecs->event_thread->stepping_over_watchpoint)
d983da9c
DJ
4393 stopped_by_watchpoint = 0;
4394 else
4395 stopped_by_watchpoint = watchpoints_triggered (&ecs->ws);
4396
4397 /* If necessary, step over this watchpoint. We'll be back to display
4398 it in a moment. */
4399 if (stopped_by_watchpoint
d92524f1 4400 && (target_have_steppable_watchpoint
568d6575 4401 || gdbarch_have_nonsteppable_watchpoint (gdbarch)))
488f131b 4402 {
488f131b
JB
4403 /* At this point, we are stopped at an instruction which has
4404 attempted to write to a piece of memory under control of
4405 a watchpoint. The instruction hasn't actually executed
4406 yet. If we were to evaluate the watchpoint expression
4407 now, we would get the old value, and therefore no change
4408 would seem to have occurred.
4409
4410 In order to make watchpoints work `right', we really need
4411 to complete the memory write, and then evaluate the
d983da9c
DJ
4412 watchpoint expression. We do this by single-stepping the
4413 target.
4414
7f89fd65 4415 It may not be necessary to disable the watchpoint to step over
d983da9c
DJ
4416 it. For example, the PA can (with some kernel cooperation)
4417 single step over a watchpoint without disabling the watchpoint.
4418
4419 It is far more common to need to disable a watchpoint to step
4420 the inferior over it. If we have non-steppable watchpoints,
4421 we must disable the current watchpoint; it's simplest to
963f9c80
PA
4422 disable all watchpoints.
4423
4424 Any breakpoint at PC must also be stepped over -- if there's
4425 one, it will have already triggered before the watchpoint
4426 triggered, and we either already reported it to the user, or
4427 it didn't cause a stop and we called keep_going. In either
4428 case, if there was a breakpoint at PC, we must be trying to
4429 step past it. */
4430 ecs->event_thread->stepping_over_watchpoint = 1;
4431 keep_going (ecs);
488f131b
JB
4432 return;
4433 }
4434
4e1c45ea 4435 ecs->event_thread->stepping_over_breakpoint = 0;
963f9c80 4436 ecs->event_thread->stepping_over_watchpoint = 0;
16c381f0
JK
4437 bpstat_clear (&ecs->event_thread->control.stop_bpstat);
4438 ecs->event_thread->control.stop_step = 0;
488f131b 4439 stop_print_frame = 1;
488f131b 4440 stopped_by_random_signal = 0;
488f131b 4441
edb3359d
DJ
4442 /* Hide inlined functions starting here, unless we just performed stepi or
4443 nexti. After stepi and nexti, always show the innermost frame (not any
4444 inline function call sites). */
16c381f0 4445 if (ecs->event_thread->control.step_range_end != 1)
0574c78f
GB
4446 {
4447 struct address_space *aspace =
4448 get_regcache_aspace (get_thread_regcache (ecs->ptid));
4449
4450 /* skip_inline_frames is expensive, so we avoid it if we can
4451 determine that the address is one where functions cannot have
4452 been inlined. This improves performance with inferiors that
4453 load a lot of shared libraries, because the solib event
4454 breakpoint is defined as the address of a function (i.e. not
4455 inline). Note that we have to check the previous PC as well
4456 as the current one to catch cases when we have just
4457 single-stepped off a breakpoint prior to reinstating it.
4458 Note that we're assuming that the code we single-step to is
4459 not inline, but that's not definitive: there's nothing
4460 preventing the event breakpoint function from containing
4461 inlined code, and the single-step ending up there. If the
4462 user had set a breakpoint on that inlined code, the missing
4463 skip_inline_frames call would break things. Fortunately
4464 that's an extremely unlikely scenario. */
09ac7c10 4465 if (!pc_at_non_inline_function (aspace, stop_pc, &ecs->ws)
a210c238
MR
4466 && !(ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP
4467 && ecs->event_thread->control.trap_expected
4468 && pc_at_non_inline_function (aspace,
4469 ecs->event_thread->prev_pc,
09ac7c10 4470 &ecs->ws)))
1c5a993e
MR
4471 {
4472 skip_inline_frames (ecs->ptid);
4473
4474 /* Re-fetch current thread's frame in case that invalidated
4475 the frame cache. */
4476 frame = get_current_frame ();
4477 gdbarch = get_frame_arch (frame);
4478 }
0574c78f 4479 }
edb3359d 4480
a493e3e2 4481 if (ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP
16c381f0 4482 && ecs->event_thread->control.trap_expected
568d6575 4483 && gdbarch_single_step_through_delay_p (gdbarch)
4e1c45ea 4484 && currently_stepping (ecs->event_thread))
3352ef37 4485 {
b50d7442 4486 /* We're trying to step off a breakpoint. Turns out that we're
3352ef37 4487 also on an instruction that needs to be stepped multiple
1777feb0 4488 times before it's been fully executing. E.g., architectures
3352ef37
AC
4489 with a delay slot. It needs to be stepped twice, once for
4490 the instruction and once for the delay slot. */
4491 int step_through_delay
568d6575 4492 = gdbarch_single_step_through_delay (gdbarch, frame);
abbb1732 4493
527159b7 4494 if (debug_infrun && step_through_delay)
8a9de0e4 4495 fprintf_unfiltered (gdb_stdlog, "infrun: step through delay\n");
16c381f0
JK
4496 if (ecs->event_thread->control.step_range_end == 0
4497 && step_through_delay)
3352ef37
AC
4498 {
4499 /* The user issued a continue when stopped at a breakpoint.
4500 Set up for another trap and get out of here. */
4e1c45ea 4501 ecs->event_thread->stepping_over_breakpoint = 1;
3352ef37
AC
4502 keep_going (ecs);
4503 return;
4504 }
4505 else if (step_through_delay)
4506 {
4507 /* The user issued a step when stopped at a breakpoint.
4508 Maybe we should stop, maybe we should not - the delay
4509 slot *might* correspond to a line of source. In any
ca67fcb8
VP
4510 case, don't decide that here, just set
4511 ecs->stepping_over_breakpoint, making sure we
4512 single-step again before breakpoints are re-inserted. */
4e1c45ea 4513 ecs->event_thread->stepping_over_breakpoint = 1;
3352ef37
AC
4514 }
4515 }
4516
ab04a2af
TT
4517 /* See if there is a breakpoint/watchpoint/catchpoint/etc. that
4518 handles this event. */
4519 ecs->event_thread->control.stop_bpstat
4520 = bpstat_stop_status (get_regcache_aspace (get_current_regcache ()),
4521 stop_pc, ecs->ptid, &ecs->ws);
db82e815 4522
ab04a2af
TT
4523 /* Following in case break condition called a
4524 function. */
4525 stop_print_frame = 1;
73dd234f 4526
ab04a2af
TT
4527 /* This is where we handle "moribund" watchpoints. Unlike
4528 software breakpoints traps, hardware watchpoint traps are
4529 always distinguishable from random traps. If no high-level
4530 watchpoint is associated with the reported stop data address
4531 anymore, then the bpstat does not explain the signal ---
4532 simply make sure to ignore it if `stopped_by_watchpoint' is
4533 set. */
4534
4535 if (debug_infrun
4536 && ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP
47591c29 4537 && !bpstat_explains_signal (ecs->event_thread->control.stop_bpstat,
427cd150 4538 GDB_SIGNAL_TRAP)
ab04a2af
TT
4539 && stopped_by_watchpoint)
4540 fprintf_unfiltered (gdb_stdlog,
4541 "infrun: no user watchpoint explains "
4542 "watchpoint SIGTRAP, ignoring\n");
73dd234f 4543
bac7d97b 4544 /* NOTE: cagney/2003-03-29: These checks for a random signal
ab04a2af
TT
4545 at one stage in the past included checks for an inferior
4546 function call's call dummy's return breakpoint. The original
4547 comment, that went with the test, read:
03cebad2 4548
ab04a2af
TT
4549 ``End of a stack dummy. Some systems (e.g. Sony news) give
4550 another signal besides SIGTRAP, so check here as well as
4551 above.''
73dd234f 4552
ab04a2af
TT
4553 If someone ever tries to get call dummys on a
4554 non-executable stack to work (where the target would stop
4555 with something like a SIGSEGV), then those tests might need
4556 to be re-instated. Given, however, that the tests were only
4557 enabled when momentary breakpoints were not being used, I
4558 suspect that it won't be the case.
488f131b 4559
ab04a2af
TT
4560 NOTE: kettenis/2004-02-05: Indeed such checks don't seem to
4561 be necessary for call dummies on a non-executable stack on
4562 SPARC. */
488f131b 4563
bac7d97b 4564 /* See if the breakpoints module can explain the signal. */
47591c29
PA
4565 random_signal
4566 = !bpstat_explains_signal (ecs->event_thread->control.stop_bpstat,
4567 ecs->event_thread->suspend.stop_signal);
bac7d97b 4568
1cf4d951
PA
4569 /* Maybe this was a trap for a software breakpoint that has since
4570 been removed. */
4571 if (random_signal && target_stopped_by_sw_breakpoint ())
4572 {
4573 if (program_breakpoint_here_p (gdbarch, stop_pc))
4574 {
4575 struct regcache *regcache;
4576 int decr_pc;
4577
4578 /* Re-adjust PC to what the program would see if GDB was not
4579 debugging it. */
4580 regcache = get_thread_regcache (ecs->event_thread->ptid);
527a273a 4581 decr_pc = gdbarch_decr_pc_after_break (gdbarch);
1cf4d951
PA
4582 if (decr_pc != 0)
4583 {
4584 struct cleanup *old_cleanups = make_cleanup (null_cleanup, NULL);
4585
4586 if (record_full_is_used ())
4587 record_full_gdb_operation_disable_set ();
4588
4589 regcache_write_pc (regcache, stop_pc + decr_pc);
4590
4591 do_cleanups (old_cleanups);
4592 }
4593 }
4594 else
4595 {
4596 /* A delayed software breakpoint event. Ignore the trap. */
4597 if (debug_infrun)
4598 fprintf_unfiltered (gdb_stdlog,
4599 "infrun: delayed software breakpoint "
4600 "trap, ignoring\n");
4601 random_signal = 0;
4602 }
4603 }
4604
4605 /* Maybe this was a trap for a hardware breakpoint/watchpoint that
4606 has since been removed. */
4607 if (random_signal && target_stopped_by_hw_breakpoint ())
4608 {
4609 /* A delayed hardware breakpoint event. Ignore the trap. */
4610 if (debug_infrun)
4611 fprintf_unfiltered (gdb_stdlog,
4612 "infrun: delayed hardware breakpoint/watchpoint "
4613 "trap, ignoring\n");
4614 random_signal = 0;
4615 }
4616
bac7d97b
PA
4617 /* If not, perhaps stepping/nexting can. */
4618 if (random_signal)
4619 random_signal = !(ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP
4620 && currently_stepping (ecs->event_thread));
ab04a2af 4621
2adfaa28
PA
4622 /* Perhaps the thread hit a single-step breakpoint of _another_
4623 thread. Single-step breakpoints are transparent to the
4624 breakpoints module. */
4625 if (random_signal)
4626 random_signal = !ecs->hit_singlestep_breakpoint;
4627
bac7d97b
PA
4628 /* No? Perhaps we got a moribund watchpoint. */
4629 if (random_signal)
4630 random_signal = !stopped_by_watchpoint;
ab04a2af 4631
488f131b
JB
4632 /* For the program's own signals, act according to
4633 the signal handling tables. */
4634
ce12b012 4635 if (random_signal)
488f131b
JB
4636 {
4637 /* Signal not for debugging purposes. */
c9657e70 4638 struct inferior *inf = find_inferior_ptid (ecs->ptid);
c9737c08 4639 enum gdb_signal stop_signal = ecs->event_thread->suspend.stop_signal;
488f131b 4640
527159b7 4641 if (debug_infrun)
c9737c08
PA
4642 fprintf_unfiltered (gdb_stdlog, "infrun: random signal (%s)\n",
4643 gdb_signal_to_symbol_string (stop_signal));
527159b7 4644
488f131b
JB
4645 stopped_by_random_signal = 1;
4646
252fbfc8
PA
4647 /* Always stop on signals if we're either just gaining control
4648 of the program, or the user explicitly requested this thread
4649 to remain stopped. */
d6b48e9c 4650 if (stop_soon != NO_STOP_QUIETLY
252fbfc8 4651 || ecs->event_thread->stop_requested
24291992 4652 || (!inf->detaching
16c381f0 4653 && signal_stop_state (ecs->event_thread->suspend.stop_signal)))
488f131b 4654 {
22bcd14b 4655 stop_waiting (ecs);
488f131b
JB
4656 return;
4657 }
b57bacec
PA
4658
4659 /* Notify observers the signal has "handle print" set. Note we
4660 returned early above if stopping; normal_stop handles the
4661 printing in that case. */
4662 if (signal_print[ecs->event_thread->suspend.stop_signal])
4663 {
4664 /* The signal table tells us to print about this signal. */
4665 target_terminal_ours_for_output ();
4666 observer_notify_signal_received (ecs->event_thread->suspend.stop_signal);
4667 target_terminal_inferior ();
4668 }
488f131b
JB
4669
4670 /* Clear the signal if it should not be passed. */
16c381f0 4671 if (signal_program[ecs->event_thread->suspend.stop_signal] == 0)
a493e3e2 4672 ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0;
488f131b 4673
fb14de7b 4674 if (ecs->event_thread->prev_pc == stop_pc
16c381f0 4675 && ecs->event_thread->control.trap_expected
8358c15c 4676 && ecs->event_thread->control.step_resume_breakpoint == NULL)
68f53502
AC
4677 {
4678 /* We were just starting a new sequence, attempting to
4679 single-step off of a breakpoint and expecting a SIGTRAP.
237fc4c9 4680 Instead this signal arrives. This signal will take us out
68f53502
AC
4681 of the stepping range so GDB needs to remember to, when
4682 the signal handler returns, resume stepping off that
4683 breakpoint. */
4684 /* To simplify things, "continue" is forced to use the same
4685 code paths as single-step - set a breakpoint at the
4686 signal return address and then, once hit, step off that
4687 breakpoint. */
237fc4c9
PA
4688 if (debug_infrun)
4689 fprintf_unfiltered (gdb_stdlog,
4690 "infrun: signal arrived while stepping over "
4691 "breakpoint\n");
d3169d93 4692
2c03e5be 4693 insert_hp_step_resume_breakpoint_at_frame (frame);
4e1c45ea 4694 ecs->event_thread->step_after_step_resume_breakpoint = 1;
2455069d
UW
4695 /* Reset trap_expected to ensure breakpoints are re-inserted. */
4696 ecs->event_thread->control.trap_expected = 0;
d137e6dc
PA
4697
4698 /* If we were nexting/stepping some other thread, switch to
4699 it, so that we don't continue it, losing control. */
4700 if (!switch_back_to_stepped_thread (ecs))
4701 keep_going (ecs);
9d799f85 4702 return;
68f53502 4703 }
9d799f85 4704
e5f8a7cc
PA
4705 if (ecs->event_thread->suspend.stop_signal != GDB_SIGNAL_0
4706 && (pc_in_thread_step_range (stop_pc, ecs->event_thread)
4707 || ecs->event_thread->control.step_range_end == 1)
edb3359d 4708 && frame_id_eq (get_stack_frame_id (frame),
16c381f0 4709 ecs->event_thread->control.step_stack_frame_id)
8358c15c 4710 && ecs->event_thread->control.step_resume_breakpoint == NULL)
d303a6c7
AC
4711 {
4712 /* The inferior is about to take a signal that will take it
4713 out of the single step range. Set a breakpoint at the
4714 current PC (which is presumably where the signal handler
4715 will eventually return) and then allow the inferior to
4716 run free.
4717
4718 Note that this is only needed for a signal delivered
4719 while in the single-step range. Nested signals aren't a
4720 problem as they eventually all return. */
237fc4c9
PA
4721 if (debug_infrun)
4722 fprintf_unfiltered (gdb_stdlog,
4723 "infrun: signal may take us out of "
4724 "single-step range\n");
4725
2c03e5be 4726 insert_hp_step_resume_breakpoint_at_frame (frame);
e5f8a7cc 4727 ecs->event_thread->step_after_step_resume_breakpoint = 1;
2455069d
UW
4728 /* Reset trap_expected to ensure breakpoints are re-inserted. */
4729 ecs->event_thread->control.trap_expected = 0;
9d799f85
AC
4730 keep_going (ecs);
4731 return;
d303a6c7 4732 }
9d799f85
AC
4733
4734 /* Note: step_resume_breakpoint may be non-NULL. This occures
4735 when either there's a nested signal, or when there's a
4736 pending signal enabled just as the signal handler returns
4737 (leaving the inferior at the step-resume-breakpoint without
4738 actually executing it). Either way continue until the
4739 breakpoint is really hit. */
c447ac0b
PA
4740
4741 if (!switch_back_to_stepped_thread (ecs))
4742 {
4743 if (debug_infrun)
4744 fprintf_unfiltered (gdb_stdlog,
4745 "infrun: random signal, keep going\n");
4746
4747 keep_going (ecs);
4748 }
4749 return;
488f131b 4750 }
94c57d6a
PA
4751
4752 process_event_stop_test (ecs);
4753}
4754
4755/* Come here when we've got some debug event / signal we can explain
4756 (IOW, not a random signal), and test whether it should cause a
4757 stop, or whether we should resume the inferior (transparently).
4758 E.g., could be a breakpoint whose condition evaluates false; we
4759 could be still stepping within the line; etc. */
4760
4761static void
4762process_event_stop_test (struct execution_control_state *ecs)
4763{
4764 struct symtab_and_line stop_pc_sal;
4765 struct frame_info *frame;
4766 struct gdbarch *gdbarch;
cdaa5b73
PA
4767 CORE_ADDR jmp_buf_pc;
4768 struct bpstat_what what;
94c57d6a 4769
cdaa5b73 4770 /* Handle cases caused by hitting a breakpoint. */
611c83ae 4771
cdaa5b73
PA
4772 frame = get_current_frame ();
4773 gdbarch = get_frame_arch (frame);
fcf3daef 4774
cdaa5b73 4775 what = bpstat_what (ecs->event_thread->control.stop_bpstat);
611c83ae 4776
cdaa5b73
PA
4777 if (what.call_dummy)
4778 {
4779 stop_stack_dummy = what.call_dummy;
4780 }
186c406b 4781
cdaa5b73
PA
4782 /* If we hit an internal event that triggers symbol changes, the
4783 current frame will be invalidated within bpstat_what (e.g., if we
4784 hit an internal solib event). Re-fetch it. */
4785 frame = get_current_frame ();
4786 gdbarch = get_frame_arch (frame);
e2e4d78b 4787
cdaa5b73
PA
4788 switch (what.main_action)
4789 {
4790 case BPSTAT_WHAT_SET_LONGJMP_RESUME:
4791 /* If we hit the breakpoint at longjmp while stepping, we
4792 install a momentary breakpoint at the target of the
4793 jmp_buf. */
186c406b 4794
cdaa5b73
PA
4795 if (debug_infrun)
4796 fprintf_unfiltered (gdb_stdlog,
4797 "infrun: BPSTAT_WHAT_SET_LONGJMP_RESUME\n");
186c406b 4798
cdaa5b73 4799 ecs->event_thread->stepping_over_breakpoint = 1;
611c83ae 4800
cdaa5b73
PA
4801 if (what.is_longjmp)
4802 {
4803 struct value *arg_value;
4804
4805 /* If we set the longjmp breakpoint via a SystemTap probe,
4806 then use it to extract the arguments. The destination PC
4807 is the third argument to the probe. */
4808 arg_value = probe_safe_evaluate_at_pc (frame, 2);
4809 if (arg_value)
8fa0c4f8
AA
4810 {
4811 jmp_buf_pc = value_as_address (arg_value);
4812 jmp_buf_pc = gdbarch_addr_bits_remove (gdbarch, jmp_buf_pc);
4813 }
cdaa5b73
PA
4814 else if (!gdbarch_get_longjmp_target_p (gdbarch)
4815 || !gdbarch_get_longjmp_target (gdbarch,
4816 frame, &jmp_buf_pc))
e2e4d78b 4817 {
cdaa5b73
PA
4818 if (debug_infrun)
4819 fprintf_unfiltered (gdb_stdlog,
4820 "infrun: BPSTAT_WHAT_SET_LONGJMP_RESUME "
4821 "(!gdbarch_get_longjmp_target)\n");
4822 keep_going (ecs);
4823 return;
e2e4d78b 4824 }
e2e4d78b 4825
cdaa5b73
PA
4826 /* Insert a breakpoint at resume address. */
4827 insert_longjmp_resume_breakpoint (gdbarch, jmp_buf_pc);
4828 }
4829 else
4830 check_exception_resume (ecs, frame);
4831 keep_going (ecs);
4832 return;
e81a37f7 4833
cdaa5b73
PA
4834 case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME:
4835 {
4836 struct frame_info *init_frame;
e81a37f7 4837
cdaa5b73 4838 /* There are several cases to consider.
c906108c 4839
cdaa5b73
PA
4840 1. The initiating frame no longer exists. In this case we
4841 must stop, because the exception or longjmp has gone too
4842 far.
2c03e5be 4843
cdaa5b73
PA
4844 2. The initiating frame exists, and is the same as the
4845 current frame. We stop, because the exception or longjmp
4846 has been caught.
2c03e5be 4847
cdaa5b73
PA
4848 3. The initiating frame exists and is different from the
4849 current frame. This means the exception or longjmp has
4850 been caught beneath the initiating frame, so keep going.
c906108c 4851
cdaa5b73
PA
4852 4. longjmp breakpoint has been placed just to protect
4853 against stale dummy frames and user is not interested in
4854 stopping around longjmps. */
c5aa993b 4855
cdaa5b73
PA
4856 if (debug_infrun)
4857 fprintf_unfiltered (gdb_stdlog,
4858 "infrun: BPSTAT_WHAT_CLEAR_LONGJMP_RESUME\n");
c5aa993b 4859
cdaa5b73
PA
4860 gdb_assert (ecs->event_thread->control.exception_resume_breakpoint
4861 != NULL);
4862 delete_exception_resume_breakpoint (ecs->event_thread);
c5aa993b 4863
cdaa5b73
PA
4864 if (what.is_longjmp)
4865 {
b67a2c6f 4866 check_longjmp_breakpoint_for_call_dummy (ecs->event_thread);
c5aa993b 4867
cdaa5b73 4868 if (!frame_id_p (ecs->event_thread->initiating_frame))
e5ef252a 4869 {
cdaa5b73
PA
4870 /* Case 4. */
4871 keep_going (ecs);
4872 return;
e5ef252a 4873 }
cdaa5b73 4874 }
c5aa993b 4875
cdaa5b73 4876 init_frame = frame_find_by_id (ecs->event_thread->initiating_frame);
527159b7 4877
cdaa5b73
PA
4878 if (init_frame)
4879 {
4880 struct frame_id current_id
4881 = get_frame_id (get_current_frame ());
4882 if (frame_id_eq (current_id,
4883 ecs->event_thread->initiating_frame))
4884 {
4885 /* Case 2. Fall through. */
4886 }
4887 else
4888 {
4889 /* Case 3. */
4890 keep_going (ecs);
4891 return;
4892 }
68f53502 4893 }
488f131b 4894
cdaa5b73
PA
4895 /* For Cases 1 and 2, remove the step-resume breakpoint, if it
4896 exists. */
4897 delete_step_resume_breakpoint (ecs->event_thread);
e5ef252a 4898
bdc36728 4899 end_stepping_range (ecs);
cdaa5b73
PA
4900 }
4901 return;
e5ef252a 4902
cdaa5b73
PA
4903 case BPSTAT_WHAT_SINGLE:
4904 if (debug_infrun)
4905 fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_SINGLE\n");
4906 ecs->event_thread->stepping_over_breakpoint = 1;
4907 /* Still need to check other stuff, at least the case where we
4908 are stepping and step out of the right range. */
4909 break;
e5ef252a 4910
cdaa5b73
PA
4911 case BPSTAT_WHAT_STEP_RESUME:
4912 if (debug_infrun)
4913 fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_STEP_RESUME\n");
e5ef252a 4914
cdaa5b73
PA
4915 delete_step_resume_breakpoint (ecs->event_thread);
4916 if (ecs->event_thread->control.proceed_to_finish
4917 && execution_direction == EXEC_REVERSE)
4918 {
4919 struct thread_info *tp = ecs->event_thread;
4920
4921 /* We are finishing a function in reverse, and just hit the
4922 step-resume breakpoint at the start address of the
4923 function, and we're almost there -- just need to back up
4924 by one more single-step, which should take us back to the
4925 function call. */
4926 tp->control.step_range_start = tp->control.step_range_end = 1;
4927 keep_going (ecs);
e5ef252a 4928 return;
cdaa5b73
PA
4929 }
4930 fill_in_stop_func (gdbarch, ecs);
4931 if (stop_pc == ecs->stop_func_start
4932 && execution_direction == EXEC_REVERSE)
4933 {
4934 /* We are stepping over a function call in reverse, and just
4935 hit the step-resume breakpoint at the start address of
4936 the function. Go back to single-stepping, which should
4937 take us back to the function call. */
4938 ecs->event_thread->stepping_over_breakpoint = 1;
4939 keep_going (ecs);
4940 return;
4941 }
4942 break;
e5ef252a 4943
cdaa5b73
PA
4944 case BPSTAT_WHAT_STOP_NOISY:
4945 if (debug_infrun)
4946 fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_STOP_NOISY\n");
4947 stop_print_frame = 1;
e5ef252a 4948
99619bea
PA
4949 /* Assume the thread stopped for a breapoint. We'll still check
4950 whether a/the breakpoint is there when the thread is next
4951 resumed. */
4952 ecs->event_thread->stepping_over_breakpoint = 1;
e5ef252a 4953
22bcd14b 4954 stop_waiting (ecs);
cdaa5b73 4955 return;
e5ef252a 4956
cdaa5b73
PA
4957 case BPSTAT_WHAT_STOP_SILENT:
4958 if (debug_infrun)
4959 fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_STOP_SILENT\n");
4960 stop_print_frame = 0;
e5ef252a 4961
99619bea
PA
4962 /* Assume the thread stopped for a breapoint. We'll still check
4963 whether a/the breakpoint is there when the thread is next
4964 resumed. */
4965 ecs->event_thread->stepping_over_breakpoint = 1;
22bcd14b 4966 stop_waiting (ecs);
cdaa5b73
PA
4967 return;
4968
4969 case BPSTAT_WHAT_HP_STEP_RESUME:
4970 if (debug_infrun)
4971 fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_HP_STEP_RESUME\n");
4972
4973 delete_step_resume_breakpoint (ecs->event_thread);
4974 if (ecs->event_thread->step_after_step_resume_breakpoint)
4975 {
4976 /* Back when the step-resume breakpoint was inserted, we
4977 were trying to single-step off a breakpoint. Go back to
4978 doing that. */
4979 ecs->event_thread->step_after_step_resume_breakpoint = 0;
4980 ecs->event_thread->stepping_over_breakpoint = 1;
4981 keep_going (ecs);
4982 return;
e5ef252a 4983 }
cdaa5b73
PA
4984 break;
4985
4986 case BPSTAT_WHAT_KEEP_CHECKING:
4987 break;
e5ef252a 4988 }
c906108c 4989
af48d08f
PA
4990 /* If we stepped a permanent breakpoint and we had a high priority
4991 step-resume breakpoint for the address we stepped, but we didn't
4992 hit it, then we must have stepped into the signal handler. The
4993 step-resume was only necessary to catch the case of _not_
4994 stepping into the handler, so delete it, and fall through to
4995 checking whether the step finished. */
4996 if (ecs->event_thread->stepped_breakpoint)
4997 {
4998 struct breakpoint *sr_bp
4999 = ecs->event_thread->control.step_resume_breakpoint;
5000
8d707a12
PA
5001 if (sr_bp != NULL
5002 && sr_bp->loc->permanent
af48d08f
PA
5003 && sr_bp->type == bp_hp_step_resume
5004 && sr_bp->loc->address == ecs->event_thread->prev_pc)
5005 {
5006 if (debug_infrun)
5007 fprintf_unfiltered (gdb_stdlog,
5008 "infrun: stepped permanent breakpoint, stopped in "
5009 "handler\n");
5010 delete_step_resume_breakpoint (ecs->event_thread);
5011 ecs->event_thread->step_after_step_resume_breakpoint = 0;
5012 }
5013 }
5014
cdaa5b73
PA
5015 /* We come here if we hit a breakpoint but should not stop for it.
5016 Possibly we also were stepping and should stop for that. So fall
5017 through and test for stepping. But, if not stepping, do not
5018 stop. */
c906108c 5019
a7212384
UW
5020 /* In all-stop mode, if we're currently stepping but have stopped in
5021 some other thread, we need to switch back to the stepped thread. */
c447ac0b
PA
5022 if (switch_back_to_stepped_thread (ecs))
5023 return;
776f04fa 5024
8358c15c 5025 if (ecs->event_thread->control.step_resume_breakpoint)
488f131b 5026 {
527159b7 5027 if (debug_infrun)
d3169d93
DJ
5028 fprintf_unfiltered (gdb_stdlog,
5029 "infrun: step-resume breakpoint is inserted\n");
527159b7 5030
488f131b
JB
5031 /* Having a step-resume breakpoint overrides anything
5032 else having to do with stepping commands until
5033 that breakpoint is reached. */
488f131b
JB
5034 keep_going (ecs);
5035 return;
5036 }
c5aa993b 5037
16c381f0 5038 if (ecs->event_thread->control.step_range_end == 0)
488f131b 5039 {
527159b7 5040 if (debug_infrun)
8a9de0e4 5041 fprintf_unfiltered (gdb_stdlog, "infrun: no stepping, continue\n");
488f131b 5042 /* Likewise if we aren't even stepping. */
488f131b
JB
5043 keep_going (ecs);
5044 return;
5045 }
c5aa993b 5046
4b7703ad
JB
5047 /* Re-fetch current thread's frame in case the code above caused
5048 the frame cache to be re-initialized, making our FRAME variable
5049 a dangling pointer. */
5050 frame = get_current_frame ();
628fe4e4 5051 gdbarch = get_frame_arch (frame);
7e324e48 5052 fill_in_stop_func (gdbarch, ecs);
4b7703ad 5053
488f131b 5054 /* If stepping through a line, keep going if still within it.
c906108c 5055
488f131b
JB
5056 Note that step_range_end is the address of the first instruction
5057 beyond the step range, and NOT the address of the last instruction
31410e84
MS
5058 within it!
5059
5060 Note also that during reverse execution, we may be stepping
5061 through a function epilogue and therefore must detect when
5062 the current-frame changes in the middle of a line. */
5063
ce4c476a 5064 if (pc_in_thread_step_range (stop_pc, ecs->event_thread)
31410e84 5065 && (execution_direction != EXEC_REVERSE
388a8562 5066 || frame_id_eq (get_frame_id (frame),
16c381f0 5067 ecs->event_thread->control.step_frame_id)))
488f131b 5068 {
527159b7 5069 if (debug_infrun)
5af949e3
UW
5070 fprintf_unfiltered
5071 (gdb_stdlog, "infrun: stepping inside range [%s-%s]\n",
16c381f0
JK
5072 paddress (gdbarch, ecs->event_thread->control.step_range_start),
5073 paddress (gdbarch, ecs->event_thread->control.step_range_end));
b2175913 5074
c1e36e3e
PA
5075 /* Tentatively re-enable range stepping; `resume' disables it if
5076 necessary (e.g., if we're stepping over a breakpoint or we
5077 have software watchpoints). */
5078 ecs->event_thread->control.may_range_step = 1;
5079
b2175913
MS
5080 /* When stepping backward, stop at beginning of line range
5081 (unless it's the function entry point, in which case
5082 keep going back to the call point). */
16c381f0 5083 if (stop_pc == ecs->event_thread->control.step_range_start
b2175913
MS
5084 && stop_pc != ecs->stop_func_start
5085 && execution_direction == EXEC_REVERSE)
bdc36728 5086 end_stepping_range (ecs);
b2175913
MS
5087 else
5088 keep_going (ecs);
5089
488f131b
JB
5090 return;
5091 }
c5aa993b 5092
488f131b 5093 /* We stepped out of the stepping range. */
c906108c 5094
488f131b 5095 /* If we are stepping at the source level and entered the runtime
388a8562
MS
5096 loader dynamic symbol resolution code...
5097
5098 EXEC_FORWARD: we keep on single stepping until we exit the run
5099 time loader code and reach the callee's address.
5100
5101 EXEC_REVERSE: we've already executed the callee (backward), and
5102 the runtime loader code is handled just like any other
5103 undebuggable function call. Now we need only keep stepping
5104 backward through the trampoline code, and that's handled further
5105 down, so there is nothing for us to do here. */
5106
5107 if (execution_direction != EXEC_REVERSE
16c381f0 5108 && ecs->event_thread->control.step_over_calls == STEP_OVER_UNDEBUGGABLE
cfd8ab24 5109 && in_solib_dynsym_resolve_code (stop_pc))
488f131b 5110 {
4c8c40e6 5111 CORE_ADDR pc_after_resolver =
568d6575 5112 gdbarch_skip_solib_resolver (gdbarch, stop_pc);
c906108c 5113
527159b7 5114 if (debug_infrun)
3e43a32a
MS
5115 fprintf_unfiltered (gdb_stdlog,
5116 "infrun: stepped into dynsym resolve code\n");
527159b7 5117
488f131b
JB
5118 if (pc_after_resolver)
5119 {
5120 /* Set up a step-resume breakpoint at the address
5121 indicated by SKIP_SOLIB_RESOLVER. */
5122 struct symtab_and_line sr_sal;
abbb1732 5123
fe39c653 5124 init_sal (&sr_sal);
488f131b 5125 sr_sal.pc = pc_after_resolver;
6c95b8df 5126 sr_sal.pspace = get_frame_program_space (frame);
488f131b 5127
a6d9a66e
UW
5128 insert_step_resume_breakpoint_at_sal (gdbarch,
5129 sr_sal, null_frame_id);
c5aa993b 5130 }
c906108c 5131
488f131b
JB
5132 keep_going (ecs);
5133 return;
5134 }
c906108c 5135
16c381f0
JK
5136 if (ecs->event_thread->control.step_range_end != 1
5137 && (ecs->event_thread->control.step_over_calls == STEP_OVER_UNDEBUGGABLE
5138 || ecs->event_thread->control.step_over_calls == STEP_OVER_ALL)
568d6575 5139 && get_frame_type (frame) == SIGTRAMP_FRAME)
488f131b 5140 {
527159b7 5141 if (debug_infrun)
3e43a32a
MS
5142 fprintf_unfiltered (gdb_stdlog,
5143 "infrun: stepped into signal trampoline\n");
42edda50 5144 /* The inferior, while doing a "step" or "next", has ended up in
8fb3e588
AC
5145 a signal trampoline (either by a signal being delivered or by
5146 the signal handler returning). Just single-step until the
5147 inferior leaves the trampoline (either by calling the handler
5148 or returning). */
488f131b
JB
5149 keep_going (ecs);
5150 return;
5151 }
c906108c 5152
14132e89
MR
5153 /* If we're in the return path from a shared library trampoline,
5154 we want to proceed through the trampoline when stepping. */
5155 /* macro/2012-04-25: This needs to come before the subroutine
5156 call check below as on some targets return trampolines look
5157 like subroutine calls (MIPS16 return thunks). */
5158 if (gdbarch_in_solib_return_trampoline (gdbarch,
5159 stop_pc, ecs->stop_func_name)
5160 && ecs->event_thread->control.step_over_calls != STEP_OVER_NONE)
5161 {
5162 /* Determine where this trampoline returns. */
5163 CORE_ADDR real_stop_pc;
5164
5165 real_stop_pc = gdbarch_skip_trampoline_code (gdbarch, frame, stop_pc);
5166
5167 if (debug_infrun)
5168 fprintf_unfiltered (gdb_stdlog,
5169 "infrun: stepped into solib return tramp\n");
5170
5171 /* Only proceed through if we know where it's going. */
5172 if (real_stop_pc)
5173 {
5174 /* And put the step-breakpoint there and go until there. */
5175 struct symtab_and_line sr_sal;
5176
5177 init_sal (&sr_sal); /* initialize to zeroes */
5178 sr_sal.pc = real_stop_pc;
5179 sr_sal.section = find_pc_overlay (sr_sal.pc);
5180 sr_sal.pspace = get_frame_program_space (frame);
5181
5182 /* Do not specify what the fp should be when we stop since
5183 on some machines the prologue is where the new fp value
5184 is established. */
5185 insert_step_resume_breakpoint_at_sal (gdbarch,
5186 sr_sal, null_frame_id);
5187
5188 /* Restart without fiddling with the step ranges or
5189 other state. */
5190 keep_going (ecs);
5191 return;
5192 }
5193 }
5194
c17eaafe
DJ
5195 /* Check for subroutine calls. The check for the current frame
5196 equalling the step ID is not necessary - the check of the
5197 previous frame's ID is sufficient - but it is a common case and
5198 cheaper than checking the previous frame's ID.
14e60db5
DJ
5199
5200 NOTE: frame_id_eq will never report two invalid frame IDs as
5201 being equal, so to get into this block, both the current and
5202 previous frame must have valid frame IDs. */
005ca36a
JB
5203 /* The outer_frame_id check is a heuristic to detect stepping
5204 through startup code. If we step over an instruction which
5205 sets the stack pointer from an invalid value to a valid value,
5206 we may detect that as a subroutine call from the mythical
5207 "outermost" function. This could be fixed by marking
5208 outermost frames as !stack_p,code_p,special_p. Then the
5209 initial outermost frame, before sp was valid, would
ce6cca6d 5210 have code_addr == &_start. See the comment in frame_id_eq
005ca36a 5211 for more. */
edb3359d 5212 if (!frame_id_eq (get_stack_frame_id (frame),
16c381f0 5213 ecs->event_thread->control.step_stack_frame_id)
005ca36a 5214 && (frame_id_eq (frame_unwind_caller_id (get_current_frame ()),
16c381f0
JK
5215 ecs->event_thread->control.step_stack_frame_id)
5216 && (!frame_id_eq (ecs->event_thread->control.step_stack_frame_id,
005ca36a 5217 outer_frame_id)
885eeb5b
PA
5218 || (ecs->event_thread->control.step_start_function
5219 != find_pc_function (stop_pc)))))
488f131b 5220 {
95918acb 5221 CORE_ADDR real_stop_pc;
8fb3e588 5222
527159b7 5223 if (debug_infrun)
8a9de0e4 5224 fprintf_unfiltered (gdb_stdlog, "infrun: stepped into subroutine\n");
527159b7 5225
b7a084be 5226 if (ecs->event_thread->control.step_over_calls == STEP_OVER_NONE)
95918acb
AC
5227 {
5228 /* I presume that step_over_calls is only 0 when we're
5229 supposed to be stepping at the assembly language level
5230 ("stepi"). Just stop. */
388a8562 5231 /* And this works the same backward as frontward. MVS */
bdc36728 5232 end_stepping_range (ecs);
95918acb
AC
5233 return;
5234 }
8fb3e588 5235
388a8562
MS
5236 /* Reverse stepping through solib trampolines. */
5237
5238 if (execution_direction == EXEC_REVERSE
16c381f0 5239 && ecs->event_thread->control.step_over_calls != STEP_OVER_NONE
388a8562
MS
5240 && (gdbarch_skip_trampoline_code (gdbarch, frame, stop_pc)
5241 || (ecs->stop_func_start == 0
5242 && in_solib_dynsym_resolve_code (stop_pc))))
5243 {
5244 /* Any solib trampoline code can be handled in reverse
5245 by simply continuing to single-step. We have already
5246 executed the solib function (backwards), and a few
5247 steps will take us back through the trampoline to the
5248 caller. */
5249 keep_going (ecs);
5250 return;
5251 }
5252
16c381f0 5253 if (ecs->event_thread->control.step_over_calls == STEP_OVER_ALL)
8567c30f 5254 {
b2175913
MS
5255 /* We're doing a "next".
5256
5257 Normal (forward) execution: set a breakpoint at the
5258 callee's return address (the address at which the caller
5259 will resume).
5260
5261 Reverse (backward) execution. set the step-resume
5262 breakpoint at the start of the function that we just
5263 stepped into (backwards), and continue to there. When we
6130d0b7 5264 get there, we'll need to single-step back to the caller. */
b2175913
MS
5265
5266 if (execution_direction == EXEC_REVERSE)
5267 {
acf9414f
JK
5268 /* If we're already at the start of the function, we've either
5269 just stepped backward into a single instruction function,
5270 or stepped back out of a signal handler to the first instruction
5271 of the function. Just keep going, which will single-step back
5272 to the caller. */
58c48e72 5273 if (ecs->stop_func_start != stop_pc && ecs->stop_func_start != 0)
acf9414f
JK
5274 {
5275 struct symtab_and_line sr_sal;
5276
5277 /* Normal function call return (static or dynamic). */
5278 init_sal (&sr_sal);
5279 sr_sal.pc = ecs->stop_func_start;
5280 sr_sal.pspace = get_frame_program_space (frame);
5281 insert_step_resume_breakpoint_at_sal (gdbarch,
5282 sr_sal, null_frame_id);
5283 }
b2175913
MS
5284 }
5285 else
568d6575 5286 insert_step_resume_breakpoint_at_caller (frame);
b2175913 5287
8567c30f
AC
5288 keep_going (ecs);
5289 return;
5290 }
a53c66de 5291
95918acb 5292 /* If we are in a function call trampoline (a stub between the
8fb3e588
AC
5293 calling routine and the real function), locate the real
5294 function. That's what tells us (a) whether we want to step
5295 into it at all, and (b) what prologue we want to run to the
5296 end of, if we do step into it. */
568d6575 5297 real_stop_pc = skip_language_trampoline (frame, stop_pc);
95918acb 5298 if (real_stop_pc == 0)
568d6575 5299 real_stop_pc = gdbarch_skip_trampoline_code (gdbarch, frame, stop_pc);
95918acb
AC
5300 if (real_stop_pc != 0)
5301 ecs->stop_func_start = real_stop_pc;
8fb3e588 5302
db5f024e 5303 if (real_stop_pc != 0 && in_solib_dynsym_resolve_code (real_stop_pc))
1b2bfbb9
RC
5304 {
5305 struct symtab_and_line sr_sal;
abbb1732 5306
1b2bfbb9
RC
5307 init_sal (&sr_sal);
5308 sr_sal.pc = ecs->stop_func_start;
6c95b8df 5309 sr_sal.pspace = get_frame_program_space (frame);
1b2bfbb9 5310
a6d9a66e
UW
5311 insert_step_resume_breakpoint_at_sal (gdbarch,
5312 sr_sal, null_frame_id);
8fb3e588
AC
5313 keep_going (ecs);
5314 return;
1b2bfbb9
RC
5315 }
5316
95918acb 5317 /* If we have line number information for the function we are
1bfeeb0f
JL
5318 thinking of stepping into and the function isn't on the skip
5319 list, step into it.
95918acb 5320
8fb3e588
AC
5321 If there are several symtabs at that PC (e.g. with include
5322 files), just want to know whether *any* of them have line
5323 numbers. find_pc_line handles this. */
95918acb
AC
5324 {
5325 struct symtab_and_line tmp_sal;
8fb3e588 5326
95918acb 5327 tmp_sal = find_pc_line (ecs->stop_func_start, 0);
2b914b52 5328 if (tmp_sal.line != 0
85817405
JK
5329 && !function_name_is_marked_for_skip (ecs->stop_func_name,
5330 &tmp_sal))
95918acb 5331 {
b2175913 5332 if (execution_direction == EXEC_REVERSE)
568d6575 5333 handle_step_into_function_backward (gdbarch, ecs);
b2175913 5334 else
568d6575 5335 handle_step_into_function (gdbarch, ecs);
95918acb
AC
5336 return;
5337 }
5338 }
5339
5340 /* If we have no line number and the step-stop-if-no-debug is
8fb3e588
AC
5341 set, we stop the step so that the user has a chance to switch
5342 in assembly mode. */
16c381f0 5343 if (ecs->event_thread->control.step_over_calls == STEP_OVER_UNDEBUGGABLE
078130d0 5344 && step_stop_if_no_debug)
95918acb 5345 {
bdc36728 5346 end_stepping_range (ecs);
95918acb
AC
5347 return;
5348 }
5349
b2175913
MS
5350 if (execution_direction == EXEC_REVERSE)
5351 {
acf9414f
JK
5352 /* If we're already at the start of the function, we've either just
5353 stepped backward into a single instruction function without line
5354 number info, or stepped back out of a signal handler to the first
5355 instruction of the function without line number info. Just keep
5356 going, which will single-step back to the caller. */
5357 if (ecs->stop_func_start != stop_pc)
5358 {
5359 /* Set a breakpoint at callee's start address.
5360 From there we can step once and be back in the caller. */
5361 struct symtab_and_line sr_sal;
abbb1732 5362
acf9414f
JK
5363 init_sal (&sr_sal);
5364 sr_sal.pc = ecs->stop_func_start;
5365 sr_sal.pspace = get_frame_program_space (frame);
5366 insert_step_resume_breakpoint_at_sal (gdbarch,
5367 sr_sal, null_frame_id);
5368 }
b2175913
MS
5369 }
5370 else
5371 /* Set a breakpoint at callee's return address (the address
5372 at which the caller will resume). */
568d6575 5373 insert_step_resume_breakpoint_at_caller (frame);
b2175913 5374
95918acb 5375 keep_going (ecs);
488f131b 5376 return;
488f131b 5377 }
c906108c 5378
fdd654f3
MS
5379 /* Reverse stepping through solib trampolines. */
5380
5381 if (execution_direction == EXEC_REVERSE
16c381f0 5382 && ecs->event_thread->control.step_over_calls != STEP_OVER_NONE)
fdd654f3
MS
5383 {
5384 if (gdbarch_skip_trampoline_code (gdbarch, frame, stop_pc)
5385 || (ecs->stop_func_start == 0
5386 && in_solib_dynsym_resolve_code (stop_pc)))
5387 {
5388 /* Any solib trampoline code can be handled in reverse
5389 by simply continuing to single-step. We have already
5390 executed the solib function (backwards), and a few
5391 steps will take us back through the trampoline to the
5392 caller. */
5393 keep_going (ecs);
5394 return;
5395 }
5396 else if (in_solib_dynsym_resolve_code (stop_pc))
5397 {
5398 /* Stepped backward into the solib dynsym resolver.
5399 Set a breakpoint at its start and continue, then
5400 one more step will take us out. */
5401 struct symtab_and_line sr_sal;
abbb1732 5402
fdd654f3
MS
5403 init_sal (&sr_sal);
5404 sr_sal.pc = ecs->stop_func_start;
9d1807c3 5405 sr_sal.pspace = get_frame_program_space (frame);
fdd654f3
MS
5406 insert_step_resume_breakpoint_at_sal (gdbarch,
5407 sr_sal, null_frame_id);
5408 keep_going (ecs);
5409 return;
5410 }
5411 }
5412
2afb61aa 5413 stop_pc_sal = find_pc_line (stop_pc, 0);
7ed0fe66 5414
1b2bfbb9
RC
5415 /* NOTE: tausq/2004-05-24: This if block used to be done before all
5416 the trampoline processing logic, however, there are some trampolines
5417 that have no names, so we should do trampoline handling first. */
16c381f0 5418 if (ecs->event_thread->control.step_over_calls == STEP_OVER_UNDEBUGGABLE
7ed0fe66 5419 && ecs->stop_func_name == NULL
2afb61aa 5420 && stop_pc_sal.line == 0)
1b2bfbb9 5421 {
527159b7 5422 if (debug_infrun)
3e43a32a
MS
5423 fprintf_unfiltered (gdb_stdlog,
5424 "infrun: stepped into undebuggable function\n");
527159b7 5425
1b2bfbb9 5426 /* The inferior just stepped into, or returned to, an
7ed0fe66
DJ
5427 undebuggable function (where there is no debugging information
5428 and no line number corresponding to the address where the
1b2bfbb9
RC
5429 inferior stopped). Since we want to skip this kind of code,
5430 we keep going until the inferior returns from this
14e60db5
DJ
5431 function - unless the user has asked us not to (via
5432 set step-mode) or we no longer know how to get back
5433 to the call site. */
5434 if (step_stop_if_no_debug
c7ce8faa 5435 || !frame_id_p (frame_unwind_caller_id (frame)))
1b2bfbb9
RC
5436 {
5437 /* If we have no line number and the step-stop-if-no-debug
5438 is set, we stop the step so that the user has a chance to
5439 switch in assembly mode. */
bdc36728 5440 end_stepping_range (ecs);
1b2bfbb9
RC
5441 return;
5442 }
5443 else
5444 {
5445 /* Set a breakpoint at callee's return address (the address
5446 at which the caller will resume). */
568d6575 5447 insert_step_resume_breakpoint_at_caller (frame);
1b2bfbb9
RC
5448 keep_going (ecs);
5449 return;
5450 }
5451 }
5452
16c381f0 5453 if (ecs->event_thread->control.step_range_end == 1)
1b2bfbb9
RC
5454 {
5455 /* It is stepi or nexti. We always want to stop stepping after
5456 one instruction. */
527159b7 5457 if (debug_infrun)
8a9de0e4 5458 fprintf_unfiltered (gdb_stdlog, "infrun: stepi/nexti\n");
bdc36728 5459 end_stepping_range (ecs);
1b2bfbb9
RC
5460 return;
5461 }
5462
2afb61aa 5463 if (stop_pc_sal.line == 0)
488f131b
JB
5464 {
5465 /* We have no line number information. That means to stop
5466 stepping (does this always happen right after one instruction,
5467 when we do "s" in a function with no line numbers,
5468 or can this happen as a result of a return or longjmp?). */
527159b7 5469 if (debug_infrun)
8a9de0e4 5470 fprintf_unfiltered (gdb_stdlog, "infrun: no line number info\n");
bdc36728 5471 end_stepping_range (ecs);
488f131b
JB
5472 return;
5473 }
c906108c 5474
edb3359d
DJ
5475 /* Look for "calls" to inlined functions, part one. If the inline
5476 frame machinery detected some skipped call sites, we have entered
5477 a new inline function. */
5478
5479 if (frame_id_eq (get_frame_id (get_current_frame ()),
16c381f0 5480 ecs->event_thread->control.step_frame_id)
edb3359d
DJ
5481 && inline_skipped_frames (ecs->ptid))
5482 {
5483 struct symtab_and_line call_sal;
5484
5485 if (debug_infrun)
5486 fprintf_unfiltered (gdb_stdlog,
5487 "infrun: stepped into inlined function\n");
5488
5489 find_frame_sal (get_current_frame (), &call_sal);
5490
16c381f0 5491 if (ecs->event_thread->control.step_over_calls != STEP_OVER_ALL)
edb3359d
DJ
5492 {
5493 /* For "step", we're going to stop. But if the call site
5494 for this inlined function is on the same source line as
5495 we were previously stepping, go down into the function
5496 first. Otherwise stop at the call site. */
5497
5498 if (call_sal.line == ecs->event_thread->current_line
5499 && call_sal.symtab == ecs->event_thread->current_symtab)
5500 step_into_inline_frame (ecs->ptid);
5501
bdc36728 5502 end_stepping_range (ecs);
edb3359d
DJ
5503 return;
5504 }
5505 else
5506 {
5507 /* For "next", we should stop at the call site if it is on a
5508 different source line. Otherwise continue through the
5509 inlined function. */
5510 if (call_sal.line == ecs->event_thread->current_line
5511 && call_sal.symtab == ecs->event_thread->current_symtab)
5512 keep_going (ecs);
5513 else
bdc36728 5514 end_stepping_range (ecs);
edb3359d
DJ
5515 return;
5516 }
5517 }
5518
5519 /* Look for "calls" to inlined functions, part two. If we are still
5520 in the same real function we were stepping through, but we have
5521 to go further up to find the exact frame ID, we are stepping
5522 through a more inlined call beyond its call site. */
5523
5524 if (get_frame_type (get_current_frame ()) == INLINE_FRAME
5525 && !frame_id_eq (get_frame_id (get_current_frame ()),
16c381f0 5526 ecs->event_thread->control.step_frame_id)
edb3359d 5527 && stepped_in_from (get_current_frame (),
16c381f0 5528 ecs->event_thread->control.step_frame_id))
edb3359d
DJ
5529 {
5530 if (debug_infrun)
5531 fprintf_unfiltered (gdb_stdlog,
5532 "infrun: stepping through inlined function\n");
5533
16c381f0 5534 if (ecs->event_thread->control.step_over_calls == STEP_OVER_ALL)
edb3359d
DJ
5535 keep_going (ecs);
5536 else
bdc36728 5537 end_stepping_range (ecs);
edb3359d
DJ
5538 return;
5539 }
5540
2afb61aa 5541 if ((stop_pc == stop_pc_sal.pc)
4e1c45ea
PA
5542 && (ecs->event_thread->current_line != stop_pc_sal.line
5543 || ecs->event_thread->current_symtab != stop_pc_sal.symtab))
488f131b
JB
5544 {
5545 /* We are at the start of a different line. So stop. Note that
5546 we don't stop if we step into the middle of a different line.
5547 That is said to make things like for (;;) statements work
5548 better. */
527159b7 5549 if (debug_infrun)
3e43a32a
MS
5550 fprintf_unfiltered (gdb_stdlog,
5551 "infrun: stepped to a different line\n");
bdc36728 5552 end_stepping_range (ecs);
488f131b
JB
5553 return;
5554 }
c906108c 5555
488f131b 5556 /* We aren't done stepping.
c906108c 5557
488f131b
JB
5558 Optimize by setting the stepping range to the line.
5559 (We might not be in the original line, but if we entered a
5560 new line in mid-statement, we continue stepping. This makes
5561 things like for(;;) statements work better.) */
c906108c 5562
16c381f0
JK
5563 ecs->event_thread->control.step_range_start = stop_pc_sal.pc;
5564 ecs->event_thread->control.step_range_end = stop_pc_sal.end;
c1e36e3e 5565 ecs->event_thread->control.may_range_step = 1;
edb3359d 5566 set_step_info (frame, stop_pc_sal);
488f131b 5567
527159b7 5568 if (debug_infrun)
8a9de0e4 5569 fprintf_unfiltered (gdb_stdlog, "infrun: keep going\n");
488f131b 5570 keep_going (ecs);
104c1213
JM
5571}
5572
c447ac0b
PA
5573/* In all-stop mode, if we're currently stepping but have stopped in
5574 some other thread, we may need to switch back to the stepped
5575 thread. Returns true we set the inferior running, false if we left
5576 it stopped (and the event needs further processing). */
5577
5578static int
5579switch_back_to_stepped_thread (struct execution_control_state *ecs)
5580{
5581 if (!non_stop)
5582 {
5583 struct thread_info *tp;
99619bea 5584 struct thread_info *stepping_thread;
483805cf 5585 struct thread_info *step_over;
99619bea
PA
5586
5587 /* If any thread is blocked on some internal breakpoint, and we
5588 simply need to step over that breakpoint to get it going
5589 again, do that first. */
5590
5591 /* However, if we see an event for the stepping thread, then we
5592 know all other threads have been moved past their breakpoints
5593 already. Let the caller check whether the step is finished,
5594 etc., before deciding to move it past a breakpoint. */
5595 if (ecs->event_thread->control.step_range_end != 0)
5596 return 0;
5597
5598 /* Check if the current thread is blocked on an incomplete
5599 step-over, interrupted by a random signal. */
5600 if (ecs->event_thread->control.trap_expected
5601 && ecs->event_thread->suspend.stop_signal != GDB_SIGNAL_TRAP)
c447ac0b 5602 {
99619bea
PA
5603 if (debug_infrun)
5604 {
5605 fprintf_unfiltered (gdb_stdlog,
5606 "infrun: need to finish step-over of [%s]\n",
5607 target_pid_to_str (ecs->event_thread->ptid));
5608 }
5609 keep_going (ecs);
5610 return 1;
5611 }
2adfaa28 5612
99619bea
PA
5613 /* Check if the current thread is blocked by a single-step
5614 breakpoint of another thread. */
5615 if (ecs->hit_singlestep_breakpoint)
5616 {
5617 if (debug_infrun)
5618 {
5619 fprintf_unfiltered (gdb_stdlog,
5620 "infrun: need to step [%s] over single-step "
5621 "breakpoint\n",
5622 target_pid_to_str (ecs->ptid));
5623 }
5624 keep_going (ecs);
5625 return 1;
5626 }
5627
483805cf
PA
5628 /* Otherwise, we no longer expect a trap in the current thread.
5629 Clear the trap_expected flag before switching back -- this is
5630 what keep_going does as well, if we call it. */
5631 ecs->event_thread->control.trap_expected = 0;
5632
70509625
PA
5633 /* Likewise, clear the signal if it should not be passed. */
5634 if (!signal_program[ecs->event_thread->suspend.stop_signal])
5635 ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0;
5636
483805cf
PA
5637 /* If scheduler locking applies even if not stepping, there's no
5638 need to walk over threads. Above we've checked whether the
5639 current thread is stepping. If some other thread not the
5640 event thread is stepping, then it must be that scheduler
5641 locking is not in effect. */
856e7dd6 5642 if (schedlock_applies (ecs->event_thread))
483805cf
PA
5643 return 0;
5644
5645 /* Look for the stepping/nexting thread, and check if any other
5646 thread other than the stepping thread needs to start a
5647 step-over. Do all step-overs before actually proceeding with
5648 step/next/etc. */
5649 stepping_thread = NULL;
5650 step_over = NULL;
034f788c 5651 ALL_NON_EXITED_THREADS (tp)
483805cf
PA
5652 {
5653 /* Ignore threads of processes we're not resuming. */
5654 if (!sched_multi
5655 && ptid_get_pid (tp->ptid) != ptid_get_pid (inferior_ptid))
5656 continue;
5657
5658 /* When stepping over a breakpoint, we lock all threads
5659 except the one that needs to move past the breakpoint.
5660 If a non-event thread has this set, the "incomplete
5661 step-over" check above should have caught it earlier. */
5662 gdb_assert (!tp->control.trap_expected);
5663
5664 /* Did we find the stepping thread? */
5665 if (tp->control.step_range_end)
5666 {
5667 /* Yep. There should only one though. */
5668 gdb_assert (stepping_thread == NULL);
5669
5670 /* The event thread is handled at the top, before we
5671 enter this loop. */
5672 gdb_assert (tp != ecs->event_thread);
5673
5674 /* If some thread other than the event thread is
5675 stepping, then scheduler locking can't be in effect,
5676 otherwise we wouldn't have resumed the current event
5677 thread in the first place. */
856e7dd6 5678 gdb_assert (!schedlock_applies (tp));
483805cf
PA
5679
5680 stepping_thread = tp;
5681 }
5682 else if (thread_still_needs_step_over (tp))
5683 {
5684 step_over = tp;
5685
5686 /* At the top we've returned early if the event thread
5687 is stepping. If some other thread not the event
5688 thread is stepping, then scheduler locking can't be
5689 in effect, and we can resume this thread. No need to
5690 keep looking for the stepping thread then. */
5691 break;
5692 }
5693 }
99619bea 5694
483805cf 5695 if (step_over != NULL)
99619bea 5696 {
483805cf 5697 tp = step_over;
99619bea 5698 if (debug_infrun)
c447ac0b 5699 {
99619bea
PA
5700 fprintf_unfiltered (gdb_stdlog,
5701 "infrun: need to step-over [%s]\n",
5702 target_pid_to_str (tp->ptid));
c447ac0b
PA
5703 }
5704
483805cf 5705 /* Only the stepping thread should have this set. */
99619bea
PA
5706 gdb_assert (tp->control.step_range_end == 0);
5707
99619bea
PA
5708 ecs->ptid = tp->ptid;
5709 ecs->event_thread = tp;
5710 switch_to_thread (ecs->ptid);
5711 keep_going (ecs);
5712 return 1;
5713 }
5714
483805cf 5715 if (stepping_thread != NULL)
99619bea
PA
5716 {
5717 struct frame_info *frame;
5718 struct gdbarch *gdbarch;
5719
483805cf
PA
5720 tp = stepping_thread;
5721
c447ac0b
PA
5722 /* If the stepping thread exited, then don't try to switch
5723 back and resume it, which could fail in several different
5724 ways depending on the target. Instead, just keep going.
5725
5726 We can find a stepping dead thread in the thread list in
5727 two cases:
5728
5729 - The target supports thread exit events, and when the
5730 target tries to delete the thread from the thread list,
5731 inferior_ptid pointed at the exiting thread. In such
5732 case, calling delete_thread does not really remove the
5733 thread from the list; instead, the thread is left listed,
5734 with 'exited' state.
5735
5736 - The target's debug interface does not support thread
5737 exit events, and so we have no idea whatsoever if the
5738 previously stepping thread is still alive. For that
5739 reason, we need to synchronously query the target
5740 now. */
5741 if (is_exited (tp->ptid)
5742 || !target_thread_alive (tp->ptid))
5743 {
5744 if (debug_infrun)
5745 fprintf_unfiltered (gdb_stdlog,
5746 "infrun: not switching back to "
5747 "stepped thread, it has vanished\n");
5748
5749 delete_thread (tp->ptid);
5750 keep_going (ecs);
5751 return 1;
5752 }
5753
c447ac0b
PA
5754 if (debug_infrun)
5755 fprintf_unfiltered (gdb_stdlog,
5756 "infrun: switching back to stepped thread\n");
5757
5758 ecs->event_thread = tp;
5759 ecs->ptid = tp->ptid;
5760 context_switch (ecs->ptid);
2adfaa28
PA
5761
5762 stop_pc = regcache_read_pc (get_thread_regcache (ecs->ptid));
5763 frame = get_current_frame ();
5764 gdbarch = get_frame_arch (frame);
5765
5766 /* If the PC of the thread we were trying to single-step has
99619bea
PA
5767 changed, then that thread has trapped or been signaled,
5768 but the event has not been reported to GDB yet. Re-poll
5769 the target looking for this particular thread's event
5770 (i.e. temporarily enable schedlock) by:
2adfaa28
PA
5771
5772 - setting a break at the current PC
5773 - resuming that particular thread, only (by setting
5774 trap expected)
5775
5776 This prevents us continuously moving the single-step
5777 breakpoint forward, one instruction at a time,
5778 overstepping. */
5779
af48d08f 5780 if (stop_pc != tp->prev_pc)
2adfaa28 5781 {
64ce06e4
PA
5782 ptid_t resume_ptid;
5783
2adfaa28
PA
5784 if (debug_infrun)
5785 fprintf_unfiltered (gdb_stdlog,
5786 "infrun: expected thread advanced also\n");
5787
7c16b83e
PA
5788 /* Clear the info of the previous step-over, as it's no
5789 longer valid. It's what keep_going would do too, if
5790 we called it. Must do this before trying to insert
5791 the sss breakpoint, otherwise if we were previously
5792 trying to step over this exact address in another
5793 thread, the breakpoint ends up not installed. */
5794 clear_step_over_info ();
5795
2adfaa28
PA
5796 insert_single_step_breakpoint (get_frame_arch (frame),
5797 get_frame_address_space (frame),
5798 stop_pc);
2adfaa28 5799
64ce06e4
PA
5800 resume_ptid = user_visible_resume_ptid (tp->control.stepping_command);
5801 do_target_resume (resume_ptid,
5802 currently_stepping (tp), GDB_SIGNAL_0);
2adfaa28
PA
5803 prepare_to_wait (ecs);
5804 }
5805 else
5806 {
5807 if (debug_infrun)
5808 fprintf_unfiltered (gdb_stdlog,
5809 "infrun: expected thread still "
5810 "hasn't advanced\n");
5811 keep_going (ecs);
5812 }
5813
c447ac0b
PA
5814 return 1;
5815 }
5816 }
5817 return 0;
5818}
5819
b3444185 5820/* Is thread TP in the middle of single-stepping? */
104c1213 5821
a289b8f6 5822static int
b3444185 5823currently_stepping (struct thread_info *tp)
a7212384 5824{
8358c15c
JK
5825 return ((tp->control.step_range_end
5826 && tp->control.step_resume_breakpoint == NULL)
5827 || tp->control.trap_expected
af48d08f 5828 || tp->stepped_breakpoint
8358c15c 5829 || bpstat_should_step ());
a7212384
UW
5830}
5831
b2175913
MS
5832/* Inferior has stepped into a subroutine call with source code that
5833 we should not step over. Do step to the first line of code in
5834 it. */
c2c6d25f
JM
5835
5836static void
568d6575
UW
5837handle_step_into_function (struct gdbarch *gdbarch,
5838 struct execution_control_state *ecs)
c2c6d25f 5839{
43f3e411 5840 struct compunit_symtab *cust;
2afb61aa 5841 struct symtab_and_line stop_func_sal, sr_sal;
c2c6d25f 5842
7e324e48
GB
5843 fill_in_stop_func (gdbarch, ecs);
5844
43f3e411
DE
5845 cust = find_pc_compunit_symtab (stop_pc);
5846 if (cust != NULL && compunit_language (cust) != language_asm)
568d6575 5847 ecs->stop_func_start = gdbarch_skip_prologue (gdbarch,
b2175913 5848 ecs->stop_func_start);
c2c6d25f 5849
2afb61aa 5850 stop_func_sal = find_pc_line (ecs->stop_func_start, 0);
c2c6d25f
JM
5851 /* Use the step_resume_break to step until the end of the prologue,
5852 even if that involves jumps (as it seems to on the vax under
5853 4.2). */
5854 /* If the prologue ends in the middle of a source line, continue to
5855 the end of that source line (if it is still within the function).
5856 Otherwise, just go to end of prologue. */
2afb61aa
PA
5857 if (stop_func_sal.end
5858 && stop_func_sal.pc != ecs->stop_func_start
5859 && stop_func_sal.end < ecs->stop_func_end)
5860 ecs->stop_func_start = stop_func_sal.end;
c2c6d25f 5861
2dbd5e30
KB
5862 /* Architectures which require breakpoint adjustment might not be able
5863 to place a breakpoint at the computed address. If so, the test
5864 ``ecs->stop_func_start == stop_pc'' will never succeed. Adjust
5865 ecs->stop_func_start to an address at which a breakpoint may be
5866 legitimately placed.
8fb3e588 5867
2dbd5e30
KB
5868 Note: kevinb/2004-01-19: On FR-V, if this adjustment is not
5869 made, GDB will enter an infinite loop when stepping through
5870 optimized code consisting of VLIW instructions which contain
5871 subinstructions corresponding to different source lines. On
5872 FR-V, it's not permitted to place a breakpoint on any but the
5873 first subinstruction of a VLIW instruction. When a breakpoint is
5874 set, GDB will adjust the breakpoint address to the beginning of
5875 the VLIW instruction. Thus, we need to make the corresponding
5876 adjustment here when computing the stop address. */
8fb3e588 5877
568d6575 5878 if (gdbarch_adjust_breakpoint_address_p (gdbarch))
2dbd5e30
KB
5879 {
5880 ecs->stop_func_start
568d6575 5881 = gdbarch_adjust_breakpoint_address (gdbarch,
8fb3e588 5882 ecs->stop_func_start);
2dbd5e30
KB
5883 }
5884
c2c6d25f
JM
5885 if (ecs->stop_func_start == stop_pc)
5886 {
5887 /* We are already there: stop now. */
bdc36728 5888 end_stepping_range (ecs);
c2c6d25f
JM
5889 return;
5890 }
5891 else
5892 {
5893 /* Put the step-breakpoint there and go until there. */
fe39c653 5894 init_sal (&sr_sal); /* initialize to zeroes */
c2c6d25f
JM
5895 sr_sal.pc = ecs->stop_func_start;
5896 sr_sal.section = find_pc_overlay (ecs->stop_func_start);
6c95b8df 5897 sr_sal.pspace = get_frame_program_space (get_current_frame ());
44cbf7b5 5898
c2c6d25f 5899 /* Do not specify what the fp should be when we stop since on
488f131b
JB
5900 some machines the prologue is where the new fp value is
5901 established. */
a6d9a66e 5902 insert_step_resume_breakpoint_at_sal (gdbarch, sr_sal, null_frame_id);
c2c6d25f
JM
5903
5904 /* And make sure stepping stops right away then. */
16c381f0
JK
5905 ecs->event_thread->control.step_range_end
5906 = ecs->event_thread->control.step_range_start;
c2c6d25f
JM
5907 }
5908 keep_going (ecs);
5909}
d4f3574e 5910
b2175913
MS
5911/* Inferior has stepped backward into a subroutine call with source
5912 code that we should not step over. Do step to the beginning of the
5913 last line of code in it. */
5914
5915static void
568d6575
UW
5916handle_step_into_function_backward (struct gdbarch *gdbarch,
5917 struct execution_control_state *ecs)
b2175913 5918{
43f3e411 5919 struct compunit_symtab *cust;
167e4384 5920 struct symtab_and_line stop_func_sal;
b2175913 5921
7e324e48
GB
5922 fill_in_stop_func (gdbarch, ecs);
5923
43f3e411
DE
5924 cust = find_pc_compunit_symtab (stop_pc);
5925 if (cust != NULL && compunit_language (cust) != language_asm)
568d6575 5926 ecs->stop_func_start = gdbarch_skip_prologue (gdbarch,
b2175913
MS
5927 ecs->stop_func_start);
5928
5929 stop_func_sal = find_pc_line (stop_pc, 0);
5930
5931 /* OK, we're just going to keep stepping here. */
5932 if (stop_func_sal.pc == stop_pc)
5933 {
5934 /* We're there already. Just stop stepping now. */
bdc36728 5935 end_stepping_range (ecs);
b2175913
MS
5936 }
5937 else
5938 {
5939 /* Else just reset the step range and keep going.
5940 No step-resume breakpoint, they don't work for
5941 epilogues, which can have multiple entry paths. */
16c381f0
JK
5942 ecs->event_thread->control.step_range_start = stop_func_sal.pc;
5943 ecs->event_thread->control.step_range_end = stop_func_sal.end;
b2175913
MS
5944 keep_going (ecs);
5945 }
5946 return;
5947}
5948
d3169d93 5949/* Insert a "step-resume breakpoint" at SR_SAL with frame ID SR_ID.
44cbf7b5
AC
5950 This is used to both functions and to skip over code. */
5951
5952static void
2c03e5be
PA
5953insert_step_resume_breakpoint_at_sal_1 (struct gdbarch *gdbarch,
5954 struct symtab_and_line sr_sal,
5955 struct frame_id sr_id,
5956 enum bptype sr_type)
44cbf7b5 5957{
611c83ae
PA
5958 /* There should never be more than one step-resume or longjmp-resume
5959 breakpoint per thread, so we should never be setting a new
44cbf7b5 5960 step_resume_breakpoint when one is already active. */
8358c15c 5961 gdb_assert (inferior_thread ()->control.step_resume_breakpoint == NULL);
2c03e5be 5962 gdb_assert (sr_type == bp_step_resume || sr_type == bp_hp_step_resume);
d3169d93
DJ
5963
5964 if (debug_infrun)
5965 fprintf_unfiltered (gdb_stdlog,
5af949e3
UW
5966 "infrun: inserting step-resume breakpoint at %s\n",
5967 paddress (gdbarch, sr_sal.pc));
d3169d93 5968
8358c15c 5969 inferior_thread ()->control.step_resume_breakpoint
2c03e5be
PA
5970 = set_momentary_breakpoint (gdbarch, sr_sal, sr_id, sr_type);
5971}
5972
9da8c2a0 5973void
2c03e5be
PA
5974insert_step_resume_breakpoint_at_sal (struct gdbarch *gdbarch,
5975 struct symtab_and_line sr_sal,
5976 struct frame_id sr_id)
5977{
5978 insert_step_resume_breakpoint_at_sal_1 (gdbarch,
5979 sr_sal, sr_id,
5980 bp_step_resume);
44cbf7b5 5981}
7ce450bd 5982
2c03e5be
PA
5983/* Insert a "high-priority step-resume breakpoint" at RETURN_FRAME.pc.
5984 This is used to skip a potential signal handler.
7ce450bd 5985
14e60db5
DJ
5986 This is called with the interrupted function's frame. The signal
5987 handler, when it returns, will resume the interrupted function at
5988 RETURN_FRAME.pc. */
d303a6c7
AC
5989
5990static void
2c03e5be 5991insert_hp_step_resume_breakpoint_at_frame (struct frame_info *return_frame)
d303a6c7
AC
5992{
5993 struct symtab_and_line sr_sal;
a6d9a66e 5994 struct gdbarch *gdbarch;
d303a6c7 5995
f4c1edd8 5996 gdb_assert (return_frame != NULL);
d303a6c7
AC
5997 init_sal (&sr_sal); /* initialize to zeros */
5998
a6d9a66e 5999 gdbarch = get_frame_arch (return_frame);
568d6575 6000 sr_sal.pc = gdbarch_addr_bits_remove (gdbarch, get_frame_pc (return_frame));
d303a6c7 6001 sr_sal.section = find_pc_overlay (sr_sal.pc);
6c95b8df 6002 sr_sal.pspace = get_frame_program_space (return_frame);
d303a6c7 6003
2c03e5be
PA
6004 insert_step_resume_breakpoint_at_sal_1 (gdbarch, sr_sal,
6005 get_stack_frame_id (return_frame),
6006 bp_hp_step_resume);
d303a6c7
AC
6007}
6008
2c03e5be
PA
6009/* Insert a "step-resume breakpoint" at the previous frame's PC. This
6010 is used to skip a function after stepping into it (for "next" or if
6011 the called function has no debugging information).
14e60db5
DJ
6012
6013 The current function has almost always been reached by single
6014 stepping a call or return instruction. NEXT_FRAME belongs to the
6015 current function, and the breakpoint will be set at the caller's
6016 resume address.
6017
6018 This is a separate function rather than reusing
2c03e5be 6019 insert_hp_step_resume_breakpoint_at_frame in order to avoid
14e60db5 6020 get_prev_frame, which may stop prematurely (see the implementation
c7ce8faa 6021 of frame_unwind_caller_id for an example). */
14e60db5
DJ
6022
6023static void
6024insert_step_resume_breakpoint_at_caller (struct frame_info *next_frame)
6025{
6026 struct symtab_and_line sr_sal;
a6d9a66e 6027 struct gdbarch *gdbarch;
14e60db5
DJ
6028
6029 /* We shouldn't have gotten here if we don't know where the call site
6030 is. */
c7ce8faa 6031 gdb_assert (frame_id_p (frame_unwind_caller_id (next_frame)));
14e60db5
DJ
6032
6033 init_sal (&sr_sal); /* initialize to zeros */
6034
a6d9a66e 6035 gdbarch = frame_unwind_caller_arch (next_frame);
c7ce8faa
DJ
6036 sr_sal.pc = gdbarch_addr_bits_remove (gdbarch,
6037 frame_unwind_caller_pc (next_frame));
14e60db5 6038 sr_sal.section = find_pc_overlay (sr_sal.pc);
6c95b8df 6039 sr_sal.pspace = frame_unwind_program_space (next_frame);
14e60db5 6040
a6d9a66e 6041 insert_step_resume_breakpoint_at_sal (gdbarch, sr_sal,
c7ce8faa 6042 frame_unwind_caller_id (next_frame));
14e60db5
DJ
6043}
6044
611c83ae
PA
6045/* Insert a "longjmp-resume" breakpoint at PC. This is used to set a
6046 new breakpoint at the target of a jmp_buf. The handling of
6047 longjmp-resume uses the same mechanisms used for handling
6048 "step-resume" breakpoints. */
6049
6050static void
a6d9a66e 6051insert_longjmp_resume_breakpoint (struct gdbarch *gdbarch, CORE_ADDR pc)
611c83ae 6052{
e81a37f7
TT
6053 /* There should never be more than one longjmp-resume breakpoint per
6054 thread, so we should never be setting a new
611c83ae 6055 longjmp_resume_breakpoint when one is already active. */
e81a37f7 6056 gdb_assert (inferior_thread ()->control.exception_resume_breakpoint == NULL);
611c83ae
PA
6057
6058 if (debug_infrun)
6059 fprintf_unfiltered (gdb_stdlog,
5af949e3
UW
6060 "infrun: inserting longjmp-resume breakpoint at %s\n",
6061 paddress (gdbarch, pc));
611c83ae 6062
e81a37f7 6063 inferior_thread ()->control.exception_resume_breakpoint =
a6d9a66e 6064 set_momentary_breakpoint_at_pc (gdbarch, pc, bp_longjmp_resume);
611c83ae
PA
6065}
6066
186c406b
TT
6067/* Insert an exception resume breakpoint. TP is the thread throwing
6068 the exception. The block B is the block of the unwinder debug hook
6069 function. FRAME is the frame corresponding to the call to this
6070 function. SYM is the symbol of the function argument holding the
6071 target PC of the exception. */
6072
6073static void
6074insert_exception_resume_breakpoint (struct thread_info *tp,
3977b71f 6075 const struct block *b,
186c406b
TT
6076 struct frame_info *frame,
6077 struct symbol *sym)
6078{
492d29ea 6079 TRY
186c406b
TT
6080 {
6081 struct symbol *vsym;
6082 struct value *value;
6083 CORE_ADDR handler;
6084 struct breakpoint *bp;
6085
6086 vsym = lookup_symbol (SYMBOL_LINKAGE_NAME (sym), b, VAR_DOMAIN, NULL);
6087 value = read_var_value (vsym, frame);
6088 /* If the value was optimized out, revert to the old behavior. */
6089 if (! value_optimized_out (value))
6090 {
6091 handler = value_as_address (value);
6092
6093 if (debug_infrun)
6094 fprintf_unfiltered (gdb_stdlog,
6095 "infrun: exception resume at %lx\n",
6096 (unsigned long) handler);
6097
6098 bp = set_momentary_breakpoint_at_pc (get_frame_arch (frame),
6099 handler, bp_exception_resume);
c70a6932
JK
6100
6101 /* set_momentary_breakpoint_at_pc invalidates FRAME. */
6102 frame = NULL;
6103
186c406b
TT
6104 bp->thread = tp->num;
6105 inferior_thread ()->control.exception_resume_breakpoint = bp;
6106 }
6107 }
492d29ea
PA
6108 CATCH (e, RETURN_MASK_ERROR)
6109 {
6110 /* We want to ignore errors here. */
6111 }
6112 END_CATCH
186c406b
TT
6113}
6114
28106bc2
SDJ
6115/* A helper for check_exception_resume that sets an
6116 exception-breakpoint based on a SystemTap probe. */
6117
6118static void
6119insert_exception_resume_from_probe (struct thread_info *tp,
729662a5 6120 const struct bound_probe *probe,
28106bc2
SDJ
6121 struct frame_info *frame)
6122{
6123 struct value *arg_value;
6124 CORE_ADDR handler;
6125 struct breakpoint *bp;
6126
6127 arg_value = probe_safe_evaluate_at_pc (frame, 1);
6128 if (!arg_value)
6129 return;
6130
6131 handler = value_as_address (arg_value);
6132
6133 if (debug_infrun)
6134 fprintf_unfiltered (gdb_stdlog,
6135 "infrun: exception resume at %s\n",
6bac7473 6136 paddress (get_objfile_arch (probe->objfile),
28106bc2
SDJ
6137 handler));
6138
6139 bp = set_momentary_breakpoint_at_pc (get_frame_arch (frame),
6140 handler, bp_exception_resume);
6141 bp->thread = tp->num;
6142 inferior_thread ()->control.exception_resume_breakpoint = bp;
6143}
6144
186c406b
TT
6145/* This is called when an exception has been intercepted. Check to
6146 see whether the exception's destination is of interest, and if so,
6147 set an exception resume breakpoint there. */
6148
6149static void
6150check_exception_resume (struct execution_control_state *ecs,
28106bc2 6151 struct frame_info *frame)
186c406b 6152{
729662a5 6153 struct bound_probe probe;
28106bc2
SDJ
6154 struct symbol *func;
6155
6156 /* First see if this exception unwinding breakpoint was set via a
6157 SystemTap probe point. If so, the probe has two arguments: the
6158 CFA and the HANDLER. We ignore the CFA, extract the handler, and
6159 set a breakpoint there. */
6bac7473 6160 probe = find_probe_by_pc (get_frame_pc (frame));
729662a5 6161 if (probe.probe)
28106bc2 6162 {
729662a5 6163 insert_exception_resume_from_probe (ecs->event_thread, &probe, frame);
28106bc2
SDJ
6164 return;
6165 }
6166
6167 func = get_frame_function (frame);
6168 if (!func)
6169 return;
186c406b 6170
492d29ea 6171 TRY
186c406b 6172 {
3977b71f 6173 const struct block *b;
8157b174 6174 struct block_iterator iter;
186c406b
TT
6175 struct symbol *sym;
6176 int argno = 0;
6177
6178 /* The exception breakpoint is a thread-specific breakpoint on
6179 the unwinder's debug hook, declared as:
6180
6181 void _Unwind_DebugHook (void *cfa, void *handler);
6182
6183 The CFA argument indicates the frame to which control is
6184 about to be transferred. HANDLER is the destination PC.
6185
6186 We ignore the CFA and set a temporary breakpoint at HANDLER.
6187 This is not extremely efficient but it avoids issues in gdb
6188 with computing the DWARF CFA, and it also works even in weird
6189 cases such as throwing an exception from inside a signal
6190 handler. */
6191
6192 b = SYMBOL_BLOCK_VALUE (func);
6193 ALL_BLOCK_SYMBOLS (b, iter, sym)
6194 {
6195 if (!SYMBOL_IS_ARGUMENT (sym))
6196 continue;
6197
6198 if (argno == 0)
6199 ++argno;
6200 else
6201 {
6202 insert_exception_resume_breakpoint (ecs->event_thread,
6203 b, frame, sym);
6204 break;
6205 }
6206 }
6207 }
492d29ea
PA
6208 CATCH (e, RETURN_MASK_ERROR)
6209 {
6210 }
6211 END_CATCH
186c406b
TT
6212}
6213
104c1213 6214static void
22bcd14b 6215stop_waiting (struct execution_control_state *ecs)
104c1213 6216{
527159b7 6217 if (debug_infrun)
22bcd14b 6218 fprintf_unfiltered (gdb_stdlog, "infrun: stop_waiting\n");
527159b7 6219
31e77af2
PA
6220 clear_step_over_info ();
6221
cd0fc7c3
SS
6222 /* Let callers know we don't want to wait for the inferior anymore. */
6223 ecs->wait_some_more = 0;
6224}
6225
a9ba6bae
PA
6226/* Called when we should continue running the inferior, because the
6227 current event doesn't cause a user visible stop. This does the
6228 resuming part; waiting for the next event is done elsewhere. */
d4f3574e
SS
6229
6230static void
6231keep_going (struct execution_control_state *ecs)
6232{
c4dbc9af
PA
6233 /* Make sure normal_stop is called if we get a QUIT handled before
6234 reaching resume. */
6235 struct cleanup *old_cleanups = make_cleanup (resume_cleanups, 0);
6236
d4f3574e 6237 /* Save the pc before execution, to compare with pc after stop. */
fb14de7b
UW
6238 ecs->event_thread->prev_pc
6239 = regcache_read_pc (get_thread_regcache (ecs->ptid));
d4f3574e 6240
16c381f0 6241 if (ecs->event_thread->control.trap_expected
a493e3e2 6242 && ecs->event_thread->suspend.stop_signal != GDB_SIGNAL_TRAP)
d4f3574e 6243 {
a9ba6bae
PA
6244 /* We haven't yet gotten our trap, and either: intercepted a
6245 non-signal event (e.g., a fork); or took a signal which we
6246 are supposed to pass through to the inferior. Simply
6247 continue. */
c4dbc9af 6248 discard_cleanups (old_cleanups);
64ce06e4 6249 resume (ecs->event_thread->suspend.stop_signal);
d4f3574e
SS
6250 }
6251 else
6252 {
31e77af2 6253 struct regcache *regcache = get_current_regcache ();
963f9c80
PA
6254 int remove_bp;
6255 int remove_wps;
31e77af2 6256
d4f3574e 6257 /* Either the trap was not expected, but we are continuing
a9ba6bae
PA
6258 anyway (if we got a signal, the user asked it be passed to
6259 the child)
6260 -- or --
6261 We got our expected trap, but decided we should resume from
6262 it.
d4f3574e 6263
a9ba6bae 6264 We're going to run this baby now!
d4f3574e 6265
c36b740a
VP
6266 Note that insert_breakpoints won't try to re-insert
6267 already inserted breakpoints. Therefore, we don't
6268 care if breakpoints were already inserted, or not. */
a9ba6bae 6269
31e77af2
PA
6270 /* If we need to step over a breakpoint, and we're not using
6271 displaced stepping to do so, insert all breakpoints
6272 (watchpoints, etc.) but the one we're stepping over, step one
6273 instruction, and then re-insert the breakpoint when that step
6274 is finished. */
963f9c80
PA
6275
6276 remove_bp = (ecs->hit_singlestep_breakpoint
6277 || thread_still_needs_step_over (ecs->event_thread));
6278 remove_wps = (ecs->event_thread->stepping_over_watchpoint
6279 && !target_have_steppable_watchpoint);
6280
cb71640d
PA
6281 /* We can't use displaced stepping if we need to step past a
6282 watchpoint. The instruction copied to the scratch pad would
6283 still trigger the watchpoint. */
6284 if (remove_bp
6285 && (remove_wps
6286 || !use_displaced_stepping (get_regcache_arch (regcache))))
45e8c884 6287 {
31e77af2 6288 set_step_over_info (get_regcache_aspace (regcache),
963f9c80 6289 regcache_read_pc (regcache), remove_wps);
45e8c884 6290 }
963f9c80
PA
6291 else if (remove_wps)
6292 set_step_over_info (NULL, 0, remove_wps);
45e8c884 6293 else
31e77af2 6294 clear_step_over_info ();
abbb1732 6295
31e77af2 6296 /* Stop stepping if inserting breakpoints fails. */
492d29ea 6297 TRY
31e77af2
PA
6298 {
6299 insert_breakpoints ();
6300 }
492d29ea 6301 CATCH (e, RETURN_MASK_ERROR)
31e77af2
PA
6302 {
6303 exception_print (gdb_stderr, e);
22bcd14b 6304 stop_waiting (ecs);
de1fe8c8 6305 discard_cleanups (old_cleanups);
31e77af2 6306 return;
d4f3574e 6307 }
492d29ea 6308 END_CATCH
d4f3574e 6309
963f9c80 6310 ecs->event_thread->control.trap_expected = (remove_bp || remove_wps);
d4f3574e 6311
a9ba6bae
PA
6312 /* Do not deliver GDB_SIGNAL_TRAP (except when the user
6313 explicitly specifies that such a signal should be delivered
6314 to the target program). Typically, that would occur when a
6315 user is debugging a target monitor on a simulator: the target
6316 monitor sets a breakpoint; the simulator encounters this
6317 breakpoint and halts the simulation handing control to GDB;
6318 GDB, noting that the stop address doesn't map to any known
6319 breakpoint, returns control back to the simulator; the
6320 simulator then delivers the hardware equivalent of a
6321 GDB_SIGNAL_TRAP to the program being debugged. */
a493e3e2 6322 if (ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP
16c381f0 6323 && !signal_program[ecs->event_thread->suspend.stop_signal])
a493e3e2 6324 ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0;
d4f3574e 6325
c4dbc9af 6326 discard_cleanups (old_cleanups);
64ce06e4 6327 resume (ecs->event_thread->suspend.stop_signal);
d4f3574e
SS
6328 }
6329
488f131b 6330 prepare_to_wait (ecs);
d4f3574e
SS
6331}
6332
104c1213
JM
6333/* This function normally comes after a resume, before
6334 handle_inferior_event exits. It takes care of any last bits of
6335 housekeeping, and sets the all-important wait_some_more flag. */
cd0fc7c3 6336
104c1213
JM
6337static void
6338prepare_to_wait (struct execution_control_state *ecs)
cd0fc7c3 6339{
527159b7 6340 if (debug_infrun)
8a9de0e4 6341 fprintf_unfiltered (gdb_stdlog, "infrun: prepare_to_wait\n");
104c1213 6342
104c1213
JM
6343 /* This is the old end of the while loop. Let everybody know we
6344 want to wait for the inferior some more and get called again
6345 soon. */
6346 ecs->wait_some_more = 1;
c906108c 6347}
11cf8741 6348
fd664c91 6349/* We are done with the step range of a step/next/si/ni command.
b57bacec 6350 Called once for each n of a "step n" operation. */
fd664c91
PA
6351
6352static void
bdc36728 6353end_stepping_range (struct execution_control_state *ecs)
fd664c91 6354{
bdc36728 6355 ecs->event_thread->control.stop_step = 1;
bdc36728 6356 stop_waiting (ecs);
fd664c91
PA
6357}
6358
33d62d64
JK
6359/* Several print_*_reason functions to print why the inferior has stopped.
6360 We always print something when the inferior exits, or receives a signal.
6361 The rest of the cases are dealt with later on in normal_stop and
6362 print_it_typical. Ideally there should be a call to one of these
6363 print_*_reason functions functions from handle_inferior_event each time
22bcd14b 6364 stop_waiting is called.
33d62d64 6365
fd664c91
PA
6366 Note that we don't call these directly, instead we delegate that to
6367 the interpreters, through observers. Interpreters then call these
6368 with whatever uiout is right. */
33d62d64 6369
fd664c91
PA
6370void
6371print_end_stepping_range_reason (struct ui_out *uiout)
33d62d64 6372{
fd664c91 6373 /* For CLI-like interpreters, print nothing. */
33d62d64 6374
fd664c91
PA
6375 if (ui_out_is_mi_like_p (uiout))
6376 {
6377 ui_out_field_string (uiout, "reason",
6378 async_reason_lookup (EXEC_ASYNC_END_STEPPING_RANGE));
6379 }
6380}
33d62d64 6381
fd664c91
PA
6382void
6383print_signal_exited_reason (struct ui_out *uiout, enum gdb_signal siggnal)
11cf8741 6384{
33d62d64
JK
6385 annotate_signalled ();
6386 if (ui_out_is_mi_like_p (uiout))
6387 ui_out_field_string
6388 (uiout, "reason", async_reason_lookup (EXEC_ASYNC_EXITED_SIGNALLED));
6389 ui_out_text (uiout, "\nProgram terminated with signal ");
6390 annotate_signal_name ();
6391 ui_out_field_string (uiout, "signal-name",
2ea28649 6392 gdb_signal_to_name (siggnal));
33d62d64
JK
6393 annotate_signal_name_end ();
6394 ui_out_text (uiout, ", ");
6395 annotate_signal_string ();
6396 ui_out_field_string (uiout, "signal-meaning",
2ea28649 6397 gdb_signal_to_string (siggnal));
33d62d64
JK
6398 annotate_signal_string_end ();
6399 ui_out_text (uiout, ".\n");
6400 ui_out_text (uiout, "The program no longer exists.\n");
6401}
6402
fd664c91
PA
6403void
6404print_exited_reason (struct ui_out *uiout, int exitstatus)
33d62d64 6405{
fda326dd
TT
6406 struct inferior *inf = current_inferior ();
6407 const char *pidstr = target_pid_to_str (pid_to_ptid (inf->pid));
6408
33d62d64
JK
6409 annotate_exited (exitstatus);
6410 if (exitstatus)
6411 {
6412 if (ui_out_is_mi_like_p (uiout))
6413 ui_out_field_string (uiout, "reason",
6414 async_reason_lookup (EXEC_ASYNC_EXITED));
fda326dd
TT
6415 ui_out_text (uiout, "[Inferior ");
6416 ui_out_text (uiout, plongest (inf->num));
6417 ui_out_text (uiout, " (");
6418 ui_out_text (uiout, pidstr);
6419 ui_out_text (uiout, ") exited with code ");
33d62d64 6420 ui_out_field_fmt (uiout, "exit-code", "0%o", (unsigned int) exitstatus);
fda326dd 6421 ui_out_text (uiout, "]\n");
33d62d64
JK
6422 }
6423 else
11cf8741 6424 {
9dc5e2a9 6425 if (ui_out_is_mi_like_p (uiout))
034dad6f 6426 ui_out_field_string
33d62d64 6427 (uiout, "reason", async_reason_lookup (EXEC_ASYNC_EXITED_NORMALLY));
fda326dd
TT
6428 ui_out_text (uiout, "[Inferior ");
6429 ui_out_text (uiout, plongest (inf->num));
6430 ui_out_text (uiout, " (");
6431 ui_out_text (uiout, pidstr);
6432 ui_out_text (uiout, ") exited normally]\n");
33d62d64 6433 }
33d62d64
JK
6434}
6435
fd664c91
PA
6436void
6437print_signal_received_reason (struct ui_out *uiout, enum gdb_signal siggnal)
33d62d64
JK
6438{
6439 annotate_signal ();
6440
a493e3e2 6441 if (siggnal == GDB_SIGNAL_0 && !ui_out_is_mi_like_p (uiout))
33d62d64
JK
6442 {
6443 struct thread_info *t = inferior_thread ();
6444
6445 ui_out_text (uiout, "\n[");
6446 ui_out_field_string (uiout, "thread-name",
6447 target_pid_to_str (t->ptid));
6448 ui_out_field_fmt (uiout, "thread-id", "] #%d", t->num);
6449 ui_out_text (uiout, " stopped");
6450 }
6451 else
6452 {
6453 ui_out_text (uiout, "\nProgram received signal ");
8b93c638 6454 annotate_signal_name ();
33d62d64
JK
6455 if (ui_out_is_mi_like_p (uiout))
6456 ui_out_field_string
6457 (uiout, "reason", async_reason_lookup (EXEC_ASYNC_SIGNAL_RECEIVED));
488f131b 6458 ui_out_field_string (uiout, "signal-name",
2ea28649 6459 gdb_signal_to_name (siggnal));
8b93c638
JM
6460 annotate_signal_name_end ();
6461 ui_out_text (uiout, ", ");
6462 annotate_signal_string ();
488f131b 6463 ui_out_field_string (uiout, "signal-meaning",
2ea28649 6464 gdb_signal_to_string (siggnal));
8b93c638 6465 annotate_signal_string_end ();
33d62d64
JK
6466 }
6467 ui_out_text (uiout, ".\n");
6468}
252fbfc8 6469
fd664c91
PA
6470void
6471print_no_history_reason (struct ui_out *uiout)
33d62d64 6472{
fd664c91 6473 ui_out_text (uiout, "\nNo more reverse-execution history.\n");
11cf8741 6474}
43ff13b4 6475
0c7e1a46
PA
6476/* Print current location without a level number, if we have changed
6477 functions or hit a breakpoint. Print source line if we have one.
6478 bpstat_print contains the logic deciding in detail what to print,
6479 based on the event(s) that just occurred. */
6480
6481void
6482print_stop_event (struct target_waitstatus *ws)
6483{
6484 int bpstat_ret;
6485 int source_flag;
6486 int do_frame_printing = 1;
6487 struct thread_info *tp = inferior_thread ();
6488
6489 bpstat_ret = bpstat_print (tp->control.stop_bpstat, ws->kind);
6490 switch (bpstat_ret)
6491 {
6492 case PRINT_UNKNOWN:
6493 /* FIXME: cagney/2002-12-01: Given that a frame ID does (or
6494 should) carry around the function and does (or should) use
6495 that when doing a frame comparison. */
6496 if (tp->control.stop_step
6497 && frame_id_eq (tp->control.step_frame_id,
6498 get_frame_id (get_current_frame ()))
885eeb5b 6499 && tp->control.step_start_function == find_pc_function (stop_pc))
0c7e1a46
PA
6500 {
6501 /* Finished step, just print source line. */
6502 source_flag = SRC_LINE;
6503 }
6504 else
6505 {
6506 /* Print location and source line. */
6507 source_flag = SRC_AND_LOC;
6508 }
6509 break;
6510 case PRINT_SRC_AND_LOC:
6511 /* Print location and source line. */
6512 source_flag = SRC_AND_LOC;
6513 break;
6514 case PRINT_SRC_ONLY:
6515 source_flag = SRC_LINE;
6516 break;
6517 case PRINT_NOTHING:
6518 /* Something bogus. */
6519 source_flag = SRC_LINE;
6520 do_frame_printing = 0;
6521 break;
6522 default:
6523 internal_error (__FILE__, __LINE__, _("Unknown value."));
6524 }
6525
6526 /* The behavior of this routine with respect to the source
6527 flag is:
6528 SRC_LINE: Print only source line
6529 LOCATION: Print only location
6530 SRC_AND_LOC: Print location and source line. */
6531 if (do_frame_printing)
6532 print_stack_frame (get_selected_frame (NULL), 0, source_flag, 1);
6533
6534 /* Display the auto-display expressions. */
6535 do_displays ();
6536}
6537
c906108c
SS
6538/* Here to return control to GDB when the inferior stops for real.
6539 Print appropriate messages, remove breakpoints, give terminal our modes.
6540
6541 STOP_PRINT_FRAME nonzero means print the executing frame
6542 (pc, function, args, file, line number and line text).
6543 BREAKPOINTS_FAILED nonzero means stop was due to error
6544 attempting to insert breakpoints. */
6545
6546void
96baa820 6547normal_stop (void)
c906108c 6548{
73b65bb0
DJ
6549 struct target_waitstatus last;
6550 ptid_t last_ptid;
29f49a6a 6551 struct cleanup *old_chain = make_cleanup (null_cleanup, NULL);
73b65bb0
DJ
6552
6553 get_last_target_status (&last_ptid, &last);
6554
29f49a6a
PA
6555 /* If an exception is thrown from this point on, make sure to
6556 propagate GDB's knowledge of the executing state to the
6557 frontend/user running state. A QUIT is an easy exception to see
6558 here, so do this before any filtered output. */
c35b1492
PA
6559 if (!non_stop)
6560 make_cleanup (finish_thread_state_cleanup, &minus_one_ptid);
6561 else if (last.kind != TARGET_WAITKIND_SIGNALLED
0e5bf2a8
PA
6562 && last.kind != TARGET_WAITKIND_EXITED
6563 && last.kind != TARGET_WAITKIND_NO_RESUMED)
c35b1492 6564 make_cleanup (finish_thread_state_cleanup, &inferior_ptid);
29f49a6a 6565
b57bacec
PA
6566 /* As we're presenting a stop, and potentially removing breakpoints,
6567 update the thread list so we can tell whether there are threads
6568 running on the target. With target remote, for example, we can
6569 only learn about new threads when we explicitly update the thread
6570 list. Do this before notifying the interpreters about signal
6571 stops, end of stepping ranges, etc., so that the "new thread"
6572 output is emitted before e.g., "Program received signal FOO",
6573 instead of after. */
6574 update_thread_list ();
6575
6576 if (last.kind == TARGET_WAITKIND_STOPPED && stopped_by_random_signal)
6577 observer_notify_signal_received (inferior_thread ()->suspend.stop_signal);
6578
c906108c
SS
6579 /* As with the notification of thread events, we want to delay
6580 notifying the user that we've switched thread context until
6581 the inferior actually stops.
6582
73b65bb0
DJ
6583 There's no point in saying anything if the inferior has exited.
6584 Note that SIGNALLED here means "exited with a signal", not
b65dc60b
PA
6585 "received a signal".
6586
6587 Also skip saying anything in non-stop mode. In that mode, as we
6588 don't want GDB to switch threads behind the user's back, to avoid
6589 races where the user is typing a command to apply to thread x,
6590 but GDB switches to thread y before the user finishes entering
6591 the command, fetch_inferior_event installs a cleanup to restore
6592 the current thread back to the thread the user had selected right
6593 after this event is handled, so we're not really switching, only
6594 informing of a stop. */
4f8d22e3
PA
6595 if (!non_stop
6596 && !ptid_equal (previous_inferior_ptid, inferior_ptid)
73b65bb0
DJ
6597 && target_has_execution
6598 && last.kind != TARGET_WAITKIND_SIGNALLED
0e5bf2a8
PA
6599 && last.kind != TARGET_WAITKIND_EXITED
6600 && last.kind != TARGET_WAITKIND_NO_RESUMED)
c906108c
SS
6601 {
6602 target_terminal_ours_for_output ();
a3f17187 6603 printf_filtered (_("[Switching to %s]\n"),
c95310c6 6604 target_pid_to_str (inferior_ptid));
b8fa951a 6605 annotate_thread_changed ();
39f77062 6606 previous_inferior_ptid = inferior_ptid;
c906108c 6607 }
c906108c 6608
0e5bf2a8
PA
6609 if (last.kind == TARGET_WAITKIND_NO_RESUMED)
6610 {
6611 gdb_assert (sync_execution || !target_can_async_p ());
6612
6613 target_terminal_ours_for_output ();
6614 printf_filtered (_("No unwaited-for children left.\n"));
6615 }
6616
b57bacec 6617 /* Note: this depends on the update_thread_list call above. */
a25a5a45 6618 if (!breakpoints_should_be_inserted_now () && target_has_execution)
c906108c
SS
6619 {
6620 if (remove_breakpoints ())
6621 {
6622 target_terminal_ours_for_output ();
3e43a32a
MS
6623 printf_filtered (_("Cannot remove breakpoints because "
6624 "program is no longer writable.\nFurther "
6625 "execution is probably impossible.\n"));
c906108c
SS
6626 }
6627 }
c906108c 6628
c906108c
SS
6629 /* If an auto-display called a function and that got a signal,
6630 delete that auto-display to avoid an infinite recursion. */
6631
6632 if (stopped_by_random_signal)
6633 disable_current_display ();
6634
b57bacec 6635 /* Notify observers if we finished a "step"-like command, etc. */
af679fd0
PA
6636 if (target_has_execution
6637 && last.kind != TARGET_WAITKIND_SIGNALLED
6638 && last.kind != TARGET_WAITKIND_EXITED
16c381f0 6639 && inferior_thread ()->control.stop_step)
b57bacec 6640 {
31cc0b80 6641 /* But not if in the middle of doing a "step n" operation for
b57bacec
PA
6642 n > 1 */
6643 if (inferior_thread ()->step_multi)
6644 goto done;
6645
6646 observer_notify_end_stepping_range ();
6647 }
c906108c
SS
6648
6649 target_terminal_ours ();
0f641c01 6650 async_enable_stdin ();
c906108c 6651
7abfe014
DJ
6652 /* Set the current source location. This will also happen if we
6653 display the frame below, but the current SAL will be incorrect
6654 during a user hook-stop function. */
d729566a 6655 if (has_stack_frames () && !stop_stack_dummy)
5166082f 6656 set_current_sal_from_frame (get_current_frame ());
7abfe014 6657
251bde03
PA
6658 /* Let the user/frontend see the threads as stopped, but do nothing
6659 if the thread was running an infcall. We may be e.g., evaluating
6660 a breakpoint condition. In that case, the thread had state
6661 THREAD_RUNNING before the infcall, and shall remain set to
6662 running, all without informing the user/frontend about state
6663 transition changes. If this is actually a call command, then the
6664 thread was originally already stopped, so there's no state to
6665 finish either. */
6666 if (target_has_execution && inferior_thread ()->control.in_infcall)
6667 discard_cleanups (old_chain);
6668 else
6669 do_cleanups (old_chain);
dd7e2d2b
PA
6670
6671 /* Look up the hook_stop and run it (CLI internally handles problem
6672 of stop_command's pre-hook not existing). */
6673 if (stop_command)
6674 catch_errors (hook_stop_stub, stop_command,
6675 "Error while running hook_stop:\n", RETURN_MASK_ALL);
6676
d729566a 6677 if (!has_stack_frames ())
d51fd4c8 6678 goto done;
c906108c 6679
32400beb
PA
6680 if (last.kind == TARGET_WAITKIND_SIGNALLED
6681 || last.kind == TARGET_WAITKIND_EXITED)
6682 goto done;
6683
c906108c
SS
6684 /* Select innermost stack frame - i.e., current frame is frame 0,
6685 and current location is based on that.
6686 Don't do this on return from a stack dummy routine,
1777feb0 6687 or if the program has exited. */
c906108c
SS
6688
6689 if (!stop_stack_dummy)
6690 {
0f7d239c 6691 select_frame (get_current_frame ());
c906108c 6692
d01a8610
AS
6693 /* If --batch-silent is enabled then there's no need to print the current
6694 source location, and to try risks causing an error message about
6695 missing source files. */
6696 if (stop_print_frame && !batch_silent)
0c7e1a46 6697 print_stop_event (&last);
c906108c
SS
6698 }
6699
6700 /* Save the function value return registers, if we care.
6701 We might be about to restore their previous contents. */
9da8c2a0
PA
6702 if (inferior_thread ()->control.proceed_to_finish
6703 && execution_direction != EXEC_REVERSE)
d5c31457
UW
6704 {
6705 /* This should not be necessary. */
6706 if (stop_registers)
6707 regcache_xfree (stop_registers);
6708
6709 /* NB: The copy goes through to the target picking up the value of
6710 all the registers. */
6711 stop_registers = regcache_dup (get_current_regcache ());
6712 }
c906108c 6713
aa7d318d 6714 if (stop_stack_dummy == STOP_STACK_DUMMY)
c906108c 6715 {
b89667eb
DE
6716 /* Pop the empty frame that contains the stack dummy.
6717 This also restores inferior state prior to the call
16c381f0 6718 (struct infcall_suspend_state). */
b89667eb 6719 struct frame_info *frame = get_current_frame ();
abbb1732 6720
b89667eb
DE
6721 gdb_assert (get_frame_type (frame) == DUMMY_FRAME);
6722 frame_pop (frame);
3e43a32a
MS
6723 /* frame_pop() calls reinit_frame_cache as the last thing it
6724 does which means there's currently no selected frame. We
6725 don't need to re-establish a selected frame if the dummy call
6726 returns normally, that will be done by
6727 restore_infcall_control_state. However, we do have to handle
6728 the case where the dummy call is returning after being
6729 stopped (e.g. the dummy call previously hit a breakpoint).
6730 We can't know which case we have so just always re-establish
6731 a selected frame here. */
0f7d239c 6732 select_frame (get_current_frame ());
c906108c
SS
6733 }
6734
c906108c
SS
6735done:
6736 annotate_stopped ();
41d2bdb4
PA
6737
6738 /* Suppress the stop observer if we're in the middle of:
6739
6740 - a step n (n > 1), as there still more steps to be done.
6741
6742 - a "finish" command, as the observer will be called in
6743 finish_command_continuation, so it can include the inferior
6744 function's return value.
6745
6746 - calling an inferior function, as we pretend we inferior didn't
6747 run at all. The return value of the call is handled by the
6748 expression evaluator, through call_function_by_hand. */
6749
6750 if (!target_has_execution
6751 || last.kind == TARGET_WAITKIND_SIGNALLED
6752 || last.kind == TARGET_WAITKIND_EXITED
0e5bf2a8 6753 || last.kind == TARGET_WAITKIND_NO_RESUMED
2ca0b532
PA
6754 || (!(inferior_thread ()->step_multi
6755 && inferior_thread ()->control.stop_step)
16c381f0
JK
6756 && !(inferior_thread ()->control.stop_bpstat
6757 && inferior_thread ()->control.proceed_to_finish)
6758 && !inferior_thread ()->control.in_infcall))
347bddb7
PA
6759 {
6760 if (!ptid_equal (inferior_ptid, null_ptid))
16c381f0 6761 observer_notify_normal_stop (inferior_thread ()->control.stop_bpstat,
1d33d6ba 6762 stop_print_frame);
347bddb7 6763 else
1d33d6ba 6764 observer_notify_normal_stop (NULL, stop_print_frame);
347bddb7 6765 }
347bddb7 6766
48844aa6
PA
6767 if (target_has_execution)
6768 {
6769 if (last.kind != TARGET_WAITKIND_SIGNALLED
6770 && last.kind != TARGET_WAITKIND_EXITED)
6771 /* Delete the breakpoint we stopped at, if it wants to be deleted.
6772 Delete any breakpoint that is to be deleted at the next stop. */
16c381f0 6773 breakpoint_auto_delete (inferior_thread ()->control.stop_bpstat);
94cc34af 6774 }
6c95b8df
PA
6775
6776 /* Try to get rid of automatically added inferiors that are no
6777 longer needed. Keeping those around slows down things linearly.
6778 Note that this never removes the current inferior. */
6779 prune_inferiors ();
c906108c
SS
6780}
6781
6782static int
96baa820 6783hook_stop_stub (void *cmd)
c906108c 6784{
5913bcb0 6785 execute_cmd_pre_hook ((struct cmd_list_element *) cmd);
c906108c
SS
6786 return (0);
6787}
6788\f
c5aa993b 6789int
96baa820 6790signal_stop_state (int signo)
c906108c 6791{
d6b48e9c 6792 return signal_stop[signo];
c906108c
SS
6793}
6794
c5aa993b 6795int
96baa820 6796signal_print_state (int signo)
c906108c
SS
6797{
6798 return signal_print[signo];
6799}
6800
c5aa993b 6801int
96baa820 6802signal_pass_state (int signo)
c906108c
SS
6803{
6804 return signal_program[signo];
6805}
6806
2455069d
UW
6807static void
6808signal_cache_update (int signo)
6809{
6810 if (signo == -1)
6811 {
a493e3e2 6812 for (signo = 0; signo < (int) GDB_SIGNAL_LAST; signo++)
2455069d
UW
6813 signal_cache_update (signo);
6814
6815 return;
6816 }
6817
6818 signal_pass[signo] = (signal_stop[signo] == 0
6819 && signal_print[signo] == 0
ab04a2af
TT
6820 && signal_program[signo] == 1
6821 && signal_catch[signo] == 0);
2455069d
UW
6822}
6823
488f131b 6824int
7bda5e4a 6825signal_stop_update (int signo, int state)
d4f3574e
SS
6826{
6827 int ret = signal_stop[signo];
abbb1732 6828
d4f3574e 6829 signal_stop[signo] = state;
2455069d 6830 signal_cache_update (signo);
d4f3574e
SS
6831 return ret;
6832}
6833
488f131b 6834int
7bda5e4a 6835signal_print_update (int signo, int state)
d4f3574e
SS
6836{
6837 int ret = signal_print[signo];
abbb1732 6838
d4f3574e 6839 signal_print[signo] = state;
2455069d 6840 signal_cache_update (signo);
d4f3574e
SS
6841 return ret;
6842}
6843
488f131b 6844int
7bda5e4a 6845signal_pass_update (int signo, int state)
d4f3574e
SS
6846{
6847 int ret = signal_program[signo];
abbb1732 6848
d4f3574e 6849 signal_program[signo] = state;
2455069d 6850 signal_cache_update (signo);
d4f3574e
SS
6851 return ret;
6852}
6853
ab04a2af
TT
6854/* Update the global 'signal_catch' from INFO and notify the
6855 target. */
6856
6857void
6858signal_catch_update (const unsigned int *info)
6859{
6860 int i;
6861
6862 for (i = 0; i < GDB_SIGNAL_LAST; ++i)
6863 signal_catch[i] = info[i] > 0;
6864 signal_cache_update (-1);
6865 target_pass_signals ((int) GDB_SIGNAL_LAST, signal_pass);
6866}
6867
c906108c 6868static void
96baa820 6869sig_print_header (void)
c906108c 6870{
3e43a32a
MS
6871 printf_filtered (_("Signal Stop\tPrint\tPass "
6872 "to program\tDescription\n"));
c906108c
SS
6873}
6874
6875static void
2ea28649 6876sig_print_info (enum gdb_signal oursig)
c906108c 6877{
2ea28649 6878 const char *name = gdb_signal_to_name (oursig);
c906108c 6879 int name_padding = 13 - strlen (name);
96baa820 6880
c906108c
SS
6881 if (name_padding <= 0)
6882 name_padding = 0;
6883
6884 printf_filtered ("%s", name);
488f131b 6885 printf_filtered ("%*.*s ", name_padding, name_padding, " ");
c906108c
SS
6886 printf_filtered ("%s\t", signal_stop[oursig] ? "Yes" : "No");
6887 printf_filtered ("%s\t", signal_print[oursig] ? "Yes" : "No");
6888 printf_filtered ("%s\t\t", signal_program[oursig] ? "Yes" : "No");
2ea28649 6889 printf_filtered ("%s\n", gdb_signal_to_string (oursig));
c906108c
SS
6890}
6891
6892/* Specify how various signals in the inferior should be handled. */
6893
6894static void
96baa820 6895handle_command (char *args, int from_tty)
c906108c
SS
6896{
6897 char **argv;
6898 int digits, wordlen;
6899 int sigfirst, signum, siglast;
2ea28649 6900 enum gdb_signal oursig;
c906108c
SS
6901 int allsigs;
6902 int nsigs;
6903 unsigned char *sigs;
6904 struct cleanup *old_chain;
6905
6906 if (args == NULL)
6907 {
e2e0b3e5 6908 error_no_arg (_("signal to handle"));
c906108c
SS
6909 }
6910
1777feb0 6911 /* Allocate and zero an array of flags for which signals to handle. */
c906108c 6912
a493e3e2 6913 nsigs = (int) GDB_SIGNAL_LAST;
c906108c
SS
6914 sigs = (unsigned char *) alloca (nsigs);
6915 memset (sigs, 0, nsigs);
6916
1777feb0 6917 /* Break the command line up into args. */
c906108c 6918
d1a41061 6919 argv = gdb_buildargv (args);
7a292a7a 6920 old_chain = make_cleanup_freeargv (argv);
c906108c
SS
6921
6922 /* Walk through the args, looking for signal oursigs, signal names, and
6923 actions. Signal numbers and signal names may be interspersed with
6924 actions, with the actions being performed for all signals cumulatively
1777feb0 6925 specified. Signal ranges can be specified as <LOW>-<HIGH>. */
c906108c
SS
6926
6927 while (*argv != NULL)
6928 {
6929 wordlen = strlen (*argv);
6930 for (digits = 0; isdigit ((*argv)[digits]); digits++)
6931 {;
6932 }
6933 allsigs = 0;
6934 sigfirst = siglast = -1;
6935
6936 if (wordlen >= 1 && !strncmp (*argv, "all", wordlen))
6937 {
6938 /* Apply action to all signals except those used by the
1777feb0 6939 debugger. Silently skip those. */
c906108c
SS
6940 allsigs = 1;
6941 sigfirst = 0;
6942 siglast = nsigs - 1;
6943 }
6944 else if (wordlen >= 1 && !strncmp (*argv, "stop", wordlen))
6945 {
6946 SET_SIGS (nsigs, sigs, signal_stop);
6947 SET_SIGS (nsigs, sigs, signal_print);
6948 }
6949 else if (wordlen >= 1 && !strncmp (*argv, "ignore", wordlen))
6950 {
6951 UNSET_SIGS (nsigs, sigs, signal_program);
6952 }
6953 else if (wordlen >= 2 && !strncmp (*argv, "print", wordlen))
6954 {
6955 SET_SIGS (nsigs, sigs, signal_print);
6956 }
6957 else if (wordlen >= 2 && !strncmp (*argv, "pass", wordlen))
6958 {
6959 SET_SIGS (nsigs, sigs, signal_program);
6960 }
6961 else if (wordlen >= 3 && !strncmp (*argv, "nostop", wordlen))
6962 {
6963 UNSET_SIGS (nsigs, sigs, signal_stop);
6964 }
6965 else if (wordlen >= 3 && !strncmp (*argv, "noignore", wordlen))
6966 {
6967 SET_SIGS (nsigs, sigs, signal_program);
6968 }
6969 else if (wordlen >= 4 && !strncmp (*argv, "noprint", wordlen))
6970 {
6971 UNSET_SIGS (nsigs, sigs, signal_print);
6972 UNSET_SIGS (nsigs, sigs, signal_stop);
6973 }
6974 else if (wordlen >= 4 && !strncmp (*argv, "nopass", wordlen))
6975 {
6976 UNSET_SIGS (nsigs, sigs, signal_program);
6977 }
6978 else if (digits > 0)
6979 {
6980 /* It is numeric. The numeric signal refers to our own
6981 internal signal numbering from target.h, not to host/target
6982 signal number. This is a feature; users really should be
6983 using symbolic names anyway, and the common ones like
6984 SIGHUP, SIGINT, SIGALRM, etc. will work right anyway. */
6985
6986 sigfirst = siglast = (int)
2ea28649 6987 gdb_signal_from_command (atoi (*argv));
c906108c
SS
6988 if ((*argv)[digits] == '-')
6989 {
6990 siglast = (int)
2ea28649 6991 gdb_signal_from_command (atoi ((*argv) + digits + 1));
c906108c
SS
6992 }
6993 if (sigfirst > siglast)
6994 {
1777feb0 6995 /* Bet he didn't figure we'd think of this case... */
c906108c
SS
6996 signum = sigfirst;
6997 sigfirst = siglast;
6998 siglast = signum;
6999 }
7000 }
7001 else
7002 {
2ea28649 7003 oursig = gdb_signal_from_name (*argv);
a493e3e2 7004 if (oursig != GDB_SIGNAL_UNKNOWN)
c906108c
SS
7005 {
7006 sigfirst = siglast = (int) oursig;
7007 }
7008 else
7009 {
7010 /* Not a number and not a recognized flag word => complain. */
8a3fe4f8 7011 error (_("Unrecognized or ambiguous flag word: \"%s\"."), *argv);
c906108c
SS
7012 }
7013 }
7014
7015 /* If any signal numbers or symbol names were found, set flags for
1777feb0 7016 which signals to apply actions to. */
c906108c
SS
7017
7018 for (signum = sigfirst; signum >= 0 && signum <= siglast; signum++)
7019 {
2ea28649 7020 switch ((enum gdb_signal) signum)
c906108c 7021 {
a493e3e2
PA
7022 case GDB_SIGNAL_TRAP:
7023 case GDB_SIGNAL_INT:
c906108c
SS
7024 if (!allsigs && !sigs[signum])
7025 {
9e2f0ad4 7026 if (query (_("%s is used by the debugger.\n\
3e43a32a 7027Are you sure you want to change it? "),
2ea28649 7028 gdb_signal_to_name ((enum gdb_signal) signum)))
c906108c
SS
7029 {
7030 sigs[signum] = 1;
7031 }
7032 else
7033 {
a3f17187 7034 printf_unfiltered (_("Not confirmed, unchanged.\n"));
c906108c
SS
7035 gdb_flush (gdb_stdout);
7036 }
7037 }
7038 break;
a493e3e2
PA
7039 case GDB_SIGNAL_0:
7040 case GDB_SIGNAL_DEFAULT:
7041 case GDB_SIGNAL_UNKNOWN:
c906108c
SS
7042 /* Make sure that "all" doesn't print these. */
7043 break;
7044 default:
7045 sigs[signum] = 1;
7046 break;
7047 }
7048 }
7049
7050 argv++;
7051 }
7052
3a031f65
PA
7053 for (signum = 0; signum < nsigs; signum++)
7054 if (sigs[signum])
7055 {
2455069d 7056 signal_cache_update (-1);
a493e3e2
PA
7057 target_pass_signals ((int) GDB_SIGNAL_LAST, signal_pass);
7058 target_program_signals ((int) GDB_SIGNAL_LAST, signal_program);
c906108c 7059
3a031f65
PA
7060 if (from_tty)
7061 {
7062 /* Show the results. */
7063 sig_print_header ();
7064 for (; signum < nsigs; signum++)
7065 if (sigs[signum])
7066 sig_print_info (signum);
7067 }
7068
7069 break;
7070 }
c906108c
SS
7071
7072 do_cleanups (old_chain);
7073}
7074
de0bea00
MF
7075/* Complete the "handle" command. */
7076
7077static VEC (char_ptr) *
7078handle_completer (struct cmd_list_element *ignore,
6f937416 7079 const char *text, const char *word)
de0bea00
MF
7080{
7081 VEC (char_ptr) *vec_signals, *vec_keywords, *return_val;
7082 static const char * const keywords[] =
7083 {
7084 "all",
7085 "stop",
7086 "ignore",
7087 "print",
7088 "pass",
7089 "nostop",
7090 "noignore",
7091 "noprint",
7092 "nopass",
7093 NULL,
7094 };
7095
7096 vec_signals = signal_completer (ignore, text, word);
7097 vec_keywords = complete_on_enum (keywords, word, word);
7098
7099 return_val = VEC_merge (char_ptr, vec_signals, vec_keywords);
7100 VEC_free (char_ptr, vec_signals);
7101 VEC_free (char_ptr, vec_keywords);
7102 return return_val;
7103}
7104
2ea28649
PA
7105enum gdb_signal
7106gdb_signal_from_command (int num)
ed01b82c
PA
7107{
7108 if (num >= 1 && num <= 15)
2ea28649 7109 return (enum gdb_signal) num;
ed01b82c
PA
7110 error (_("Only signals 1-15 are valid as numeric signals.\n\
7111Use \"info signals\" for a list of symbolic signals."));
7112}
7113
c906108c
SS
7114/* Print current contents of the tables set by the handle command.
7115 It is possible we should just be printing signals actually used
7116 by the current target (but for things to work right when switching
7117 targets, all signals should be in the signal tables). */
7118
7119static void
96baa820 7120signals_info (char *signum_exp, int from_tty)
c906108c 7121{
2ea28649 7122 enum gdb_signal oursig;
abbb1732 7123
c906108c
SS
7124 sig_print_header ();
7125
7126 if (signum_exp)
7127 {
7128 /* First see if this is a symbol name. */
2ea28649 7129 oursig = gdb_signal_from_name (signum_exp);
a493e3e2 7130 if (oursig == GDB_SIGNAL_UNKNOWN)
c906108c
SS
7131 {
7132 /* No, try numeric. */
7133 oursig =
2ea28649 7134 gdb_signal_from_command (parse_and_eval_long (signum_exp));
c906108c
SS
7135 }
7136 sig_print_info (oursig);
7137 return;
7138 }
7139
7140 printf_filtered ("\n");
7141 /* These ugly casts brought to you by the native VAX compiler. */
a493e3e2
PA
7142 for (oursig = GDB_SIGNAL_FIRST;
7143 (int) oursig < (int) GDB_SIGNAL_LAST;
2ea28649 7144 oursig = (enum gdb_signal) ((int) oursig + 1))
c906108c
SS
7145 {
7146 QUIT;
7147
a493e3e2
PA
7148 if (oursig != GDB_SIGNAL_UNKNOWN
7149 && oursig != GDB_SIGNAL_DEFAULT && oursig != GDB_SIGNAL_0)
c906108c
SS
7150 sig_print_info (oursig);
7151 }
7152
3e43a32a
MS
7153 printf_filtered (_("\nUse the \"handle\" command "
7154 "to change these tables.\n"));
c906108c 7155}
4aa995e1 7156
c709acd1
PA
7157/* Check if it makes sense to read $_siginfo from the current thread
7158 at this point. If not, throw an error. */
7159
7160static void
7161validate_siginfo_access (void)
7162{
7163 /* No current inferior, no siginfo. */
7164 if (ptid_equal (inferior_ptid, null_ptid))
7165 error (_("No thread selected."));
7166
7167 /* Don't try to read from a dead thread. */
7168 if (is_exited (inferior_ptid))
7169 error (_("The current thread has terminated"));
7170
7171 /* ... or from a spinning thread. */
7172 if (is_running (inferior_ptid))
7173 error (_("Selected thread is running."));
7174}
7175
4aa995e1
PA
7176/* The $_siginfo convenience variable is a bit special. We don't know
7177 for sure the type of the value until we actually have a chance to
7a9dd1b2 7178 fetch the data. The type can change depending on gdbarch, so it is
4aa995e1
PA
7179 also dependent on which thread you have selected.
7180
7181 1. making $_siginfo be an internalvar that creates a new value on
7182 access.
7183
7184 2. making the value of $_siginfo be an lval_computed value. */
7185
7186/* This function implements the lval_computed support for reading a
7187 $_siginfo value. */
7188
7189static void
7190siginfo_value_read (struct value *v)
7191{
7192 LONGEST transferred;
7193
c709acd1
PA
7194 validate_siginfo_access ();
7195
4aa995e1
PA
7196 transferred =
7197 target_read (&current_target, TARGET_OBJECT_SIGNAL_INFO,
7198 NULL,
7199 value_contents_all_raw (v),
7200 value_offset (v),
7201 TYPE_LENGTH (value_type (v)));
7202
7203 if (transferred != TYPE_LENGTH (value_type (v)))
7204 error (_("Unable to read siginfo"));
7205}
7206
7207/* This function implements the lval_computed support for writing a
7208 $_siginfo value. */
7209
7210static void
7211siginfo_value_write (struct value *v, struct value *fromval)
7212{
7213 LONGEST transferred;
7214
c709acd1
PA
7215 validate_siginfo_access ();
7216
4aa995e1
PA
7217 transferred = target_write (&current_target,
7218 TARGET_OBJECT_SIGNAL_INFO,
7219 NULL,
7220 value_contents_all_raw (fromval),
7221 value_offset (v),
7222 TYPE_LENGTH (value_type (fromval)));
7223
7224 if (transferred != TYPE_LENGTH (value_type (fromval)))
7225 error (_("Unable to write siginfo"));
7226}
7227
c8f2448a 7228static const struct lval_funcs siginfo_value_funcs =
4aa995e1
PA
7229 {
7230 siginfo_value_read,
7231 siginfo_value_write
7232 };
7233
7234/* Return a new value with the correct type for the siginfo object of
78267919
UW
7235 the current thread using architecture GDBARCH. Return a void value
7236 if there's no object available. */
4aa995e1 7237
2c0b251b 7238static struct value *
22d2b532
SDJ
7239siginfo_make_value (struct gdbarch *gdbarch, struct internalvar *var,
7240 void *ignore)
4aa995e1 7241{
4aa995e1 7242 if (target_has_stack
78267919
UW
7243 && !ptid_equal (inferior_ptid, null_ptid)
7244 && gdbarch_get_siginfo_type_p (gdbarch))
4aa995e1 7245 {
78267919 7246 struct type *type = gdbarch_get_siginfo_type (gdbarch);
abbb1732 7247
78267919 7248 return allocate_computed_value (type, &siginfo_value_funcs, NULL);
4aa995e1
PA
7249 }
7250
78267919 7251 return allocate_value (builtin_type (gdbarch)->builtin_void);
4aa995e1
PA
7252}
7253
c906108c 7254\f
16c381f0
JK
7255/* infcall_suspend_state contains state about the program itself like its
7256 registers and any signal it received when it last stopped.
7257 This state must be restored regardless of how the inferior function call
7258 ends (either successfully, or after it hits a breakpoint or signal)
7259 if the program is to properly continue where it left off. */
7260
7261struct infcall_suspend_state
7a292a7a 7262{
16c381f0 7263 struct thread_suspend_state thread_suspend;
dd80ea3c 7264#if 0 /* Currently unused and empty structures are not valid C. */
16c381f0 7265 struct inferior_suspend_state inferior_suspend;
dd80ea3c 7266#endif
16c381f0
JK
7267
7268 /* Other fields: */
7a292a7a 7269 CORE_ADDR stop_pc;
b89667eb 7270 struct regcache *registers;
1736ad11 7271
35515841 7272 /* Format of SIGINFO_DATA or NULL if it is not present. */
1736ad11
JK
7273 struct gdbarch *siginfo_gdbarch;
7274
7275 /* The inferior format depends on SIGINFO_GDBARCH and it has a length of
7276 TYPE_LENGTH (gdbarch_get_siginfo_type ()). For different gdbarch the
7277 content would be invalid. */
7278 gdb_byte *siginfo_data;
b89667eb
DE
7279};
7280
16c381f0
JK
7281struct infcall_suspend_state *
7282save_infcall_suspend_state (void)
b89667eb 7283{
16c381f0 7284 struct infcall_suspend_state *inf_state;
b89667eb 7285 struct thread_info *tp = inferior_thread ();
974a734b 7286#if 0
16c381f0 7287 struct inferior *inf = current_inferior ();
974a734b 7288#endif
1736ad11
JK
7289 struct regcache *regcache = get_current_regcache ();
7290 struct gdbarch *gdbarch = get_regcache_arch (regcache);
7291 gdb_byte *siginfo_data = NULL;
7292
7293 if (gdbarch_get_siginfo_type_p (gdbarch))
7294 {
7295 struct type *type = gdbarch_get_siginfo_type (gdbarch);
7296 size_t len = TYPE_LENGTH (type);
7297 struct cleanup *back_to;
7298
7299 siginfo_data = xmalloc (len);
7300 back_to = make_cleanup (xfree, siginfo_data);
7301
7302 if (target_read (&current_target, TARGET_OBJECT_SIGNAL_INFO, NULL,
7303 siginfo_data, 0, len) == len)
7304 discard_cleanups (back_to);
7305 else
7306 {
7307 /* Errors ignored. */
7308 do_cleanups (back_to);
7309 siginfo_data = NULL;
7310 }
7311 }
7312
41bf6aca 7313 inf_state = XCNEW (struct infcall_suspend_state);
1736ad11
JK
7314
7315 if (siginfo_data)
7316 {
7317 inf_state->siginfo_gdbarch = gdbarch;
7318 inf_state->siginfo_data = siginfo_data;
7319 }
b89667eb 7320
16c381f0 7321 inf_state->thread_suspend = tp->suspend;
dd80ea3c 7322#if 0 /* Currently unused and empty structures are not valid C. */
16c381f0 7323 inf_state->inferior_suspend = inf->suspend;
dd80ea3c 7324#endif
16c381f0 7325
35515841 7326 /* run_inferior_call will not use the signal due to its `proceed' call with
a493e3e2
PA
7327 GDB_SIGNAL_0 anyway. */
7328 tp->suspend.stop_signal = GDB_SIGNAL_0;
35515841 7329
b89667eb
DE
7330 inf_state->stop_pc = stop_pc;
7331
1736ad11 7332 inf_state->registers = regcache_dup (regcache);
b89667eb
DE
7333
7334 return inf_state;
7335}
7336
7337/* Restore inferior session state to INF_STATE. */
7338
7339void
16c381f0 7340restore_infcall_suspend_state (struct infcall_suspend_state *inf_state)
b89667eb
DE
7341{
7342 struct thread_info *tp = inferior_thread ();
974a734b 7343#if 0
16c381f0 7344 struct inferior *inf = current_inferior ();
974a734b 7345#endif
1736ad11
JK
7346 struct regcache *regcache = get_current_regcache ();
7347 struct gdbarch *gdbarch = get_regcache_arch (regcache);
b89667eb 7348
16c381f0 7349 tp->suspend = inf_state->thread_suspend;
dd80ea3c 7350#if 0 /* Currently unused and empty structures are not valid C. */
16c381f0 7351 inf->suspend = inf_state->inferior_suspend;
dd80ea3c 7352#endif
16c381f0 7353
b89667eb
DE
7354 stop_pc = inf_state->stop_pc;
7355
1736ad11
JK
7356 if (inf_state->siginfo_gdbarch == gdbarch)
7357 {
7358 struct type *type = gdbarch_get_siginfo_type (gdbarch);
1736ad11
JK
7359
7360 /* Errors ignored. */
7361 target_write (&current_target, TARGET_OBJECT_SIGNAL_INFO, NULL,
6acef6cd 7362 inf_state->siginfo_data, 0, TYPE_LENGTH (type));
1736ad11
JK
7363 }
7364
b89667eb
DE
7365 /* The inferior can be gone if the user types "print exit(0)"
7366 (and perhaps other times). */
7367 if (target_has_execution)
7368 /* NB: The register write goes through to the target. */
1736ad11 7369 regcache_cpy (regcache, inf_state->registers);
803b5f95 7370
16c381f0 7371 discard_infcall_suspend_state (inf_state);
b89667eb
DE
7372}
7373
7374static void
16c381f0 7375do_restore_infcall_suspend_state_cleanup (void *state)
b89667eb 7376{
16c381f0 7377 restore_infcall_suspend_state (state);
b89667eb
DE
7378}
7379
7380struct cleanup *
16c381f0
JK
7381make_cleanup_restore_infcall_suspend_state
7382 (struct infcall_suspend_state *inf_state)
b89667eb 7383{
16c381f0 7384 return make_cleanup (do_restore_infcall_suspend_state_cleanup, inf_state);
b89667eb
DE
7385}
7386
7387void
16c381f0 7388discard_infcall_suspend_state (struct infcall_suspend_state *inf_state)
b89667eb
DE
7389{
7390 regcache_xfree (inf_state->registers);
803b5f95 7391 xfree (inf_state->siginfo_data);
b89667eb
DE
7392 xfree (inf_state);
7393}
7394
7395struct regcache *
16c381f0 7396get_infcall_suspend_state_regcache (struct infcall_suspend_state *inf_state)
b89667eb
DE
7397{
7398 return inf_state->registers;
7399}
7400
16c381f0
JK
7401/* infcall_control_state contains state regarding gdb's control of the
7402 inferior itself like stepping control. It also contains session state like
7403 the user's currently selected frame. */
b89667eb 7404
16c381f0 7405struct infcall_control_state
b89667eb 7406{
16c381f0
JK
7407 struct thread_control_state thread_control;
7408 struct inferior_control_state inferior_control;
d82142e2
JK
7409
7410 /* Other fields: */
7411 enum stop_stack_kind stop_stack_dummy;
7412 int stopped_by_random_signal;
7a292a7a 7413 int stop_after_trap;
7a292a7a 7414
b89667eb 7415 /* ID if the selected frame when the inferior function call was made. */
101dcfbe 7416 struct frame_id selected_frame_id;
7a292a7a
SS
7417};
7418
c906108c 7419/* Save all of the information associated with the inferior<==>gdb
b89667eb 7420 connection. */
c906108c 7421
16c381f0
JK
7422struct infcall_control_state *
7423save_infcall_control_state (void)
c906108c 7424{
16c381f0 7425 struct infcall_control_state *inf_status = xmalloc (sizeof (*inf_status));
4e1c45ea 7426 struct thread_info *tp = inferior_thread ();
d6b48e9c 7427 struct inferior *inf = current_inferior ();
7a292a7a 7428
16c381f0
JK
7429 inf_status->thread_control = tp->control;
7430 inf_status->inferior_control = inf->control;
d82142e2 7431
8358c15c 7432 tp->control.step_resume_breakpoint = NULL;
5b79abe7 7433 tp->control.exception_resume_breakpoint = NULL;
8358c15c 7434
16c381f0
JK
7435 /* Save original bpstat chain to INF_STATUS; replace it in TP with copy of
7436 chain. If caller's caller is walking the chain, they'll be happier if we
7437 hand them back the original chain when restore_infcall_control_state is
7438 called. */
7439 tp->control.stop_bpstat = bpstat_copy (tp->control.stop_bpstat);
d82142e2
JK
7440
7441 /* Other fields: */
7442 inf_status->stop_stack_dummy = stop_stack_dummy;
7443 inf_status->stopped_by_random_signal = stopped_by_random_signal;
7444 inf_status->stop_after_trap = stop_after_trap;
c5aa993b 7445
206415a3 7446 inf_status->selected_frame_id = get_frame_id (get_selected_frame (NULL));
b89667eb 7447
7a292a7a 7448 return inf_status;
c906108c
SS
7449}
7450
c906108c 7451static int
96baa820 7452restore_selected_frame (void *args)
c906108c 7453{
488f131b 7454 struct frame_id *fid = (struct frame_id *) args;
c906108c 7455 struct frame_info *frame;
c906108c 7456
101dcfbe 7457 frame = frame_find_by_id (*fid);
c906108c 7458
aa0cd9c1
AC
7459 /* If inf_status->selected_frame_id is NULL, there was no previously
7460 selected frame. */
101dcfbe 7461 if (frame == NULL)
c906108c 7462 {
8a3fe4f8 7463 warning (_("Unable to restore previously selected frame."));
c906108c
SS
7464 return 0;
7465 }
7466
0f7d239c 7467 select_frame (frame);
c906108c
SS
7468
7469 return (1);
7470}
7471
b89667eb
DE
7472/* Restore inferior session state to INF_STATUS. */
7473
c906108c 7474void
16c381f0 7475restore_infcall_control_state (struct infcall_control_state *inf_status)
c906108c 7476{
4e1c45ea 7477 struct thread_info *tp = inferior_thread ();
d6b48e9c 7478 struct inferior *inf = current_inferior ();
4e1c45ea 7479
8358c15c
JK
7480 if (tp->control.step_resume_breakpoint)
7481 tp->control.step_resume_breakpoint->disposition = disp_del_at_next_stop;
7482
5b79abe7
TT
7483 if (tp->control.exception_resume_breakpoint)
7484 tp->control.exception_resume_breakpoint->disposition
7485 = disp_del_at_next_stop;
7486
d82142e2 7487 /* Handle the bpstat_copy of the chain. */
16c381f0 7488 bpstat_clear (&tp->control.stop_bpstat);
d82142e2 7489
16c381f0
JK
7490 tp->control = inf_status->thread_control;
7491 inf->control = inf_status->inferior_control;
d82142e2
JK
7492
7493 /* Other fields: */
7494 stop_stack_dummy = inf_status->stop_stack_dummy;
7495 stopped_by_random_signal = inf_status->stopped_by_random_signal;
7496 stop_after_trap = inf_status->stop_after_trap;
c906108c 7497
b89667eb 7498 if (target_has_stack)
c906108c 7499 {
c906108c 7500 /* The point of catch_errors is that if the stack is clobbered,
101dcfbe
AC
7501 walking the stack might encounter a garbage pointer and
7502 error() trying to dereference it. */
488f131b
JB
7503 if (catch_errors
7504 (restore_selected_frame, &inf_status->selected_frame_id,
7505 "Unable to restore previously selected frame:\n",
7506 RETURN_MASK_ERROR) == 0)
c906108c
SS
7507 /* Error in restoring the selected frame. Select the innermost
7508 frame. */
0f7d239c 7509 select_frame (get_current_frame ());
c906108c 7510 }
c906108c 7511
72cec141 7512 xfree (inf_status);
7a292a7a 7513}
c906108c 7514
74b7792f 7515static void
16c381f0 7516do_restore_infcall_control_state_cleanup (void *sts)
74b7792f 7517{
16c381f0 7518 restore_infcall_control_state (sts);
74b7792f
AC
7519}
7520
7521struct cleanup *
16c381f0
JK
7522make_cleanup_restore_infcall_control_state
7523 (struct infcall_control_state *inf_status)
74b7792f 7524{
16c381f0 7525 return make_cleanup (do_restore_infcall_control_state_cleanup, inf_status);
74b7792f
AC
7526}
7527
c906108c 7528void
16c381f0 7529discard_infcall_control_state (struct infcall_control_state *inf_status)
7a292a7a 7530{
8358c15c
JK
7531 if (inf_status->thread_control.step_resume_breakpoint)
7532 inf_status->thread_control.step_resume_breakpoint->disposition
7533 = disp_del_at_next_stop;
7534
5b79abe7
TT
7535 if (inf_status->thread_control.exception_resume_breakpoint)
7536 inf_status->thread_control.exception_resume_breakpoint->disposition
7537 = disp_del_at_next_stop;
7538
1777feb0 7539 /* See save_infcall_control_state for info on stop_bpstat. */
16c381f0 7540 bpstat_clear (&inf_status->thread_control.stop_bpstat);
8358c15c 7541
72cec141 7542 xfree (inf_status);
7a292a7a 7543}
b89667eb 7544\f
ca6724c1
KB
7545/* restore_inferior_ptid() will be used by the cleanup machinery
7546 to restore the inferior_ptid value saved in a call to
7547 save_inferior_ptid(). */
ce696e05
KB
7548
7549static void
7550restore_inferior_ptid (void *arg)
7551{
7552 ptid_t *saved_ptid_ptr = arg;
abbb1732 7553
ce696e05
KB
7554 inferior_ptid = *saved_ptid_ptr;
7555 xfree (arg);
7556}
7557
7558/* Save the value of inferior_ptid so that it may be restored by a
7559 later call to do_cleanups(). Returns the struct cleanup pointer
7560 needed for later doing the cleanup. */
7561
7562struct cleanup *
7563save_inferior_ptid (void)
7564{
7565 ptid_t *saved_ptid_ptr;
7566
7567 saved_ptid_ptr = xmalloc (sizeof (ptid_t));
7568 *saved_ptid_ptr = inferior_ptid;
7569 return make_cleanup (restore_inferior_ptid, saved_ptid_ptr);
7570}
0c557179 7571
7f89fd65 7572/* See infrun.h. */
0c557179
SDJ
7573
7574void
7575clear_exit_convenience_vars (void)
7576{
7577 clear_internalvar (lookup_internalvar ("_exitsignal"));
7578 clear_internalvar (lookup_internalvar ("_exitcode"));
7579}
c5aa993b 7580\f
488f131b 7581
b2175913
MS
7582/* User interface for reverse debugging:
7583 Set exec-direction / show exec-direction commands
7584 (returns error unless target implements to_set_exec_direction method). */
7585
32231432 7586int execution_direction = EXEC_FORWARD;
b2175913
MS
7587static const char exec_forward[] = "forward";
7588static const char exec_reverse[] = "reverse";
7589static const char *exec_direction = exec_forward;
40478521 7590static const char *const exec_direction_names[] = {
b2175913
MS
7591 exec_forward,
7592 exec_reverse,
7593 NULL
7594};
7595
7596static void
7597set_exec_direction_func (char *args, int from_tty,
7598 struct cmd_list_element *cmd)
7599{
7600 if (target_can_execute_reverse)
7601 {
7602 if (!strcmp (exec_direction, exec_forward))
7603 execution_direction = EXEC_FORWARD;
7604 else if (!strcmp (exec_direction, exec_reverse))
7605 execution_direction = EXEC_REVERSE;
7606 }
8bbed405
MS
7607 else
7608 {
7609 exec_direction = exec_forward;
7610 error (_("Target does not support this operation."));
7611 }
b2175913
MS
7612}
7613
7614static void
7615show_exec_direction_func (struct ui_file *out, int from_tty,
7616 struct cmd_list_element *cmd, const char *value)
7617{
7618 switch (execution_direction) {
7619 case EXEC_FORWARD:
7620 fprintf_filtered (out, _("Forward.\n"));
7621 break;
7622 case EXEC_REVERSE:
7623 fprintf_filtered (out, _("Reverse.\n"));
7624 break;
b2175913 7625 default:
d8b34453
PA
7626 internal_error (__FILE__, __LINE__,
7627 _("bogus execution_direction value: %d"),
7628 (int) execution_direction);
b2175913
MS
7629 }
7630}
7631
d4db2f36
PA
7632static void
7633show_schedule_multiple (struct ui_file *file, int from_tty,
7634 struct cmd_list_element *c, const char *value)
7635{
3e43a32a
MS
7636 fprintf_filtered (file, _("Resuming the execution of threads "
7637 "of all processes is %s.\n"), value);
d4db2f36 7638}
ad52ddc6 7639
22d2b532
SDJ
7640/* Implementation of `siginfo' variable. */
7641
7642static const struct internalvar_funcs siginfo_funcs =
7643{
7644 siginfo_make_value,
7645 NULL,
7646 NULL
7647};
7648
c906108c 7649void
96baa820 7650_initialize_infrun (void)
c906108c 7651{
52f0bd74
AC
7652 int i;
7653 int numsigs;
de0bea00 7654 struct cmd_list_element *c;
c906108c 7655
1bedd215
AC
7656 add_info ("signals", signals_info, _("\
7657What debugger does when program gets various signals.\n\
7658Specify a signal as argument to print info on that signal only."));
c906108c
SS
7659 add_info_alias ("handle", "signals", 0);
7660
de0bea00 7661 c = add_com ("handle", class_run, handle_command, _("\
dfbd5e7b 7662Specify how to handle signals.\n\
486c7739 7663Usage: handle SIGNAL [ACTIONS]\n\
c906108c 7664Args are signals and actions to apply to those signals.\n\
dfbd5e7b 7665If no actions are specified, the current settings for the specified signals\n\
486c7739
MF
7666will be displayed instead.\n\
7667\n\
c906108c
SS
7668Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\
7669from 1-15 are allowed for compatibility with old versions of GDB.\n\
7670Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\
7671The special arg \"all\" is recognized to mean all signals except those\n\
1bedd215 7672used by the debugger, typically SIGTRAP and SIGINT.\n\
486c7739 7673\n\
1bedd215 7674Recognized actions include \"stop\", \"nostop\", \"print\", \"noprint\",\n\
c906108c
SS
7675\"pass\", \"nopass\", \"ignore\", or \"noignore\".\n\
7676Stop means reenter debugger if this signal happens (implies print).\n\
7677Print means print a message if this signal happens.\n\
7678Pass means let program see this signal; otherwise program doesn't know.\n\
7679Ignore is a synonym for nopass and noignore is a synonym for pass.\n\
dfbd5e7b
PA
7680Pass and Stop may be combined.\n\
7681\n\
7682Multiple signals may be specified. Signal numbers and signal names\n\
7683may be interspersed with actions, with the actions being performed for\n\
7684all signals cumulatively specified."));
de0bea00 7685 set_cmd_completer (c, handle_completer);
486c7739 7686
c906108c 7687 if (!dbx_commands)
1a966eab
AC
7688 stop_command = add_cmd ("stop", class_obscure,
7689 not_just_help_class_command, _("\
7690There is no `stop' command, but you can set a hook on `stop'.\n\
c906108c 7691This allows you to set a list of commands to be run each time execution\n\
1a966eab 7692of the program stops."), &cmdlist);
c906108c 7693
ccce17b0 7694 add_setshow_zuinteger_cmd ("infrun", class_maintenance, &debug_infrun, _("\
85c07804
AC
7695Set inferior debugging."), _("\
7696Show inferior debugging."), _("\
7697When non-zero, inferior specific debugging is enabled."),
ccce17b0
YQ
7698 NULL,
7699 show_debug_infrun,
7700 &setdebuglist, &showdebuglist);
527159b7 7701
3e43a32a
MS
7702 add_setshow_boolean_cmd ("displaced", class_maintenance,
7703 &debug_displaced, _("\
237fc4c9
PA
7704Set displaced stepping debugging."), _("\
7705Show displaced stepping debugging."), _("\
7706When non-zero, displaced stepping specific debugging is enabled."),
7707 NULL,
7708 show_debug_displaced,
7709 &setdebuglist, &showdebuglist);
7710
ad52ddc6
PA
7711 add_setshow_boolean_cmd ("non-stop", no_class,
7712 &non_stop_1, _("\
7713Set whether gdb controls the inferior in non-stop mode."), _("\
7714Show whether gdb controls the inferior in non-stop mode."), _("\
7715When debugging a multi-threaded program and this setting is\n\
7716off (the default, also called all-stop mode), when one thread stops\n\
7717(for a breakpoint, watchpoint, exception, or similar events), GDB stops\n\
7718all other threads in the program while you interact with the thread of\n\
7719interest. When you continue or step a thread, you can allow the other\n\
7720threads to run, or have them remain stopped, but while you inspect any\n\
7721thread's state, all threads stop.\n\
7722\n\
7723In non-stop mode, when one thread stops, other threads can continue\n\
7724to run freely. You'll be able to step each thread independently,\n\
7725leave it stopped or free to run as needed."),
7726 set_non_stop,
7727 show_non_stop,
7728 &setlist,
7729 &showlist);
7730
a493e3e2 7731 numsigs = (int) GDB_SIGNAL_LAST;
488f131b 7732 signal_stop = (unsigned char *) xmalloc (sizeof (signal_stop[0]) * numsigs);
c906108c
SS
7733 signal_print = (unsigned char *)
7734 xmalloc (sizeof (signal_print[0]) * numsigs);
7735 signal_program = (unsigned char *)
7736 xmalloc (sizeof (signal_program[0]) * numsigs);
ab04a2af
TT
7737 signal_catch = (unsigned char *)
7738 xmalloc (sizeof (signal_catch[0]) * numsigs);
2455069d 7739 signal_pass = (unsigned char *)
4395285e 7740 xmalloc (sizeof (signal_pass[0]) * numsigs);
c906108c
SS
7741 for (i = 0; i < numsigs; i++)
7742 {
7743 signal_stop[i] = 1;
7744 signal_print[i] = 1;
7745 signal_program[i] = 1;
ab04a2af 7746 signal_catch[i] = 0;
c906108c
SS
7747 }
7748
7749 /* Signals caused by debugger's own actions
7750 should not be given to the program afterwards. */
a493e3e2
PA
7751 signal_program[GDB_SIGNAL_TRAP] = 0;
7752 signal_program[GDB_SIGNAL_INT] = 0;
c906108c
SS
7753
7754 /* Signals that are not errors should not normally enter the debugger. */
a493e3e2
PA
7755 signal_stop[GDB_SIGNAL_ALRM] = 0;
7756 signal_print[GDB_SIGNAL_ALRM] = 0;
7757 signal_stop[GDB_SIGNAL_VTALRM] = 0;
7758 signal_print[GDB_SIGNAL_VTALRM] = 0;
7759 signal_stop[GDB_SIGNAL_PROF] = 0;
7760 signal_print[GDB_SIGNAL_PROF] = 0;
7761 signal_stop[GDB_SIGNAL_CHLD] = 0;
7762 signal_print[GDB_SIGNAL_CHLD] = 0;
7763 signal_stop[GDB_SIGNAL_IO] = 0;
7764 signal_print[GDB_SIGNAL_IO] = 0;
7765 signal_stop[GDB_SIGNAL_POLL] = 0;
7766 signal_print[GDB_SIGNAL_POLL] = 0;
7767 signal_stop[GDB_SIGNAL_URG] = 0;
7768 signal_print[GDB_SIGNAL_URG] = 0;
7769 signal_stop[GDB_SIGNAL_WINCH] = 0;
7770 signal_print[GDB_SIGNAL_WINCH] = 0;
7771 signal_stop[GDB_SIGNAL_PRIO] = 0;
7772 signal_print[GDB_SIGNAL_PRIO] = 0;
c906108c 7773
cd0fc7c3
SS
7774 /* These signals are used internally by user-level thread
7775 implementations. (See signal(5) on Solaris.) Like the above
7776 signals, a healthy program receives and handles them as part of
7777 its normal operation. */
a493e3e2
PA
7778 signal_stop[GDB_SIGNAL_LWP] = 0;
7779 signal_print[GDB_SIGNAL_LWP] = 0;
7780 signal_stop[GDB_SIGNAL_WAITING] = 0;
7781 signal_print[GDB_SIGNAL_WAITING] = 0;
7782 signal_stop[GDB_SIGNAL_CANCEL] = 0;
7783 signal_print[GDB_SIGNAL_CANCEL] = 0;
cd0fc7c3 7784
2455069d
UW
7785 /* Update cached state. */
7786 signal_cache_update (-1);
7787
85c07804
AC
7788 add_setshow_zinteger_cmd ("stop-on-solib-events", class_support,
7789 &stop_on_solib_events, _("\
7790Set stopping for shared library events."), _("\
7791Show stopping for shared library events."), _("\
c906108c
SS
7792If nonzero, gdb will give control to the user when the dynamic linker\n\
7793notifies gdb of shared library events. The most common event of interest\n\
85c07804 7794to the user would be loading/unloading of a new library."),
f9e14852 7795 set_stop_on_solib_events,
920d2a44 7796 show_stop_on_solib_events,
85c07804 7797 &setlist, &showlist);
c906108c 7798
7ab04401
AC
7799 add_setshow_enum_cmd ("follow-fork-mode", class_run,
7800 follow_fork_mode_kind_names,
7801 &follow_fork_mode_string, _("\
7802Set debugger response to a program call of fork or vfork."), _("\
7803Show debugger response to a program call of fork or vfork."), _("\
c906108c
SS
7804A fork or vfork creates a new process. follow-fork-mode can be:\n\
7805 parent - the original process is debugged after a fork\n\
7806 child - the new process is debugged after a fork\n\
ea1dd7bc 7807The unfollowed process will continue to run.\n\
7ab04401
AC
7808By default, the debugger will follow the parent process."),
7809 NULL,
920d2a44 7810 show_follow_fork_mode_string,
7ab04401
AC
7811 &setlist, &showlist);
7812
6c95b8df
PA
7813 add_setshow_enum_cmd ("follow-exec-mode", class_run,
7814 follow_exec_mode_names,
7815 &follow_exec_mode_string, _("\
7816Set debugger response to a program call of exec."), _("\
7817Show debugger response to a program call of exec."), _("\
7818An exec call replaces the program image of a process.\n\
7819\n\
7820follow-exec-mode can be:\n\
7821\n\
cce7e648 7822 new - the debugger creates a new inferior and rebinds the process\n\
6c95b8df
PA
7823to this new inferior. The program the process was running before\n\
7824the exec call can be restarted afterwards by restarting the original\n\
7825inferior.\n\
7826\n\
7827 same - the debugger keeps the process bound to the same inferior.\n\
7828The new executable image replaces the previous executable loaded in\n\
7829the inferior. Restarting the inferior after the exec call restarts\n\
7830the executable the process was running after the exec call.\n\
7831\n\
7832By default, the debugger will use the same inferior."),
7833 NULL,
7834 show_follow_exec_mode_string,
7835 &setlist, &showlist);
7836
7ab04401
AC
7837 add_setshow_enum_cmd ("scheduler-locking", class_run,
7838 scheduler_enums, &scheduler_mode, _("\
7839Set mode for locking scheduler during execution."), _("\
7840Show mode for locking scheduler during execution."), _("\
c906108c
SS
7841off == no locking (threads may preempt at any time)\n\
7842on == full locking (no thread except the current thread may run)\n\
856e7dd6
PA
7843step == scheduler locked during stepping commands (step, next, stepi, nexti).\n\
7844 In this mode, other threads may run during other commands."),
7ab04401 7845 set_schedlock_func, /* traps on target vector */
920d2a44 7846 show_scheduler_mode,
7ab04401 7847 &setlist, &showlist);
5fbbeb29 7848
d4db2f36
PA
7849 add_setshow_boolean_cmd ("schedule-multiple", class_run, &sched_multi, _("\
7850Set mode for resuming threads of all processes."), _("\
7851Show mode for resuming threads of all processes."), _("\
7852When on, execution commands (such as 'continue' or 'next') resume all\n\
7853threads of all processes. When off (which is the default), execution\n\
7854commands only resume the threads of the current process. The set of\n\
7855threads that are resumed is further refined by the scheduler-locking\n\
7856mode (see help set scheduler-locking)."),
7857 NULL,
7858 show_schedule_multiple,
7859 &setlist, &showlist);
7860
5bf193a2
AC
7861 add_setshow_boolean_cmd ("step-mode", class_run, &step_stop_if_no_debug, _("\
7862Set mode of the step operation."), _("\
7863Show mode of the step operation."), _("\
7864When set, doing a step over a function without debug line information\n\
7865will stop at the first instruction of that function. Otherwise, the\n\
7866function is skipped and the step command stops at a different source line."),
7867 NULL,
920d2a44 7868 show_step_stop_if_no_debug,
5bf193a2 7869 &setlist, &showlist);
ca6724c1 7870
72d0e2c5
YQ
7871 add_setshow_auto_boolean_cmd ("displaced-stepping", class_run,
7872 &can_use_displaced_stepping, _("\
237fc4c9
PA
7873Set debugger's willingness to use displaced stepping."), _("\
7874Show debugger's willingness to use displaced stepping."), _("\
fff08868
HZ
7875If on, gdb will use displaced stepping to step over breakpoints if it is\n\
7876supported by the target architecture. If off, gdb will not use displaced\n\
7877stepping to step over breakpoints, even if such is supported by the target\n\
7878architecture. If auto (which is the default), gdb will use displaced stepping\n\
7879if the target architecture supports it and non-stop mode is active, but will not\n\
7880use it in all-stop mode (see help set non-stop)."),
72d0e2c5
YQ
7881 NULL,
7882 show_can_use_displaced_stepping,
7883 &setlist, &showlist);
237fc4c9 7884
b2175913
MS
7885 add_setshow_enum_cmd ("exec-direction", class_run, exec_direction_names,
7886 &exec_direction, _("Set direction of execution.\n\
7887Options are 'forward' or 'reverse'."),
7888 _("Show direction of execution (forward/reverse)."),
7889 _("Tells gdb whether to execute forward or backward."),
7890 set_exec_direction_func, show_exec_direction_func,
7891 &setlist, &showlist);
7892
6c95b8df
PA
7893 /* Set/show detach-on-fork: user-settable mode. */
7894
7895 add_setshow_boolean_cmd ("detach-on-fork", class_run, &detach_fork, _("\
7896Set whether gdb will detach the child of a fork."), _("\
7897Show whether gdb will detach the child of a fork."), _("\
7898Tells gdb whether to detach the child of a fork."),
7899 NULL, NULL, &setlist, &showlist);
7900
03583c20
UW
7901 /* Set/show disable address space randomization mode. */
7902
7903 add_setshow_boolean_cmd ("disable-randomization", class_support,
7904 &disable_randomization, _("\
7905Set disabling of debuggee's virtual address space randomization."), _("\
7906Show disabling of debuggee's virtual address space randomization."), _("\
7907When this mode is on (which is the default), randomization of the virtual\n\
7908address space is disabled. Standalone programs run with the randomization\n\
7909enabled by default on some platforms."),
7910 &set_disable_randomization,
7911 &show_disable_randomization,
7912 &setlist, &showlist);
7913
ca6724c1 7914 /* ptid initializations */
ca6724c1
KB
7915 inferior_ptid = null_ptid;
7916 target_last_wait_ptid = minus_one_ptid;
5231c1fd
PA
7917
7918 observer_attach_thread_ptid_changed (infrun_thread_ptid_changed);
252fbfc8 7919 observer_attach_thread_stop_requested (infrun_thread_stop_requested);
a07daef3 7920 observer_attach_thread_exit (infrun_thread_thread_exit);
fc1cf338 7921 observer_attach_inferior_exit (infrun_inferior_exit);
4aa995e1
PA
7922
7923 /* Explicitly create without lookup, since that tries to create a
7924 value with a void typed value, and when we get here, gdbarch
7925 isn't initialized yet. At this point, we're quite sure there
7926 isn't another convenience variable of the same name. */
22d2b532 7927 create_internalvar_type_lazy ("_siginfo", &siginfo_funcs, NULL);
d914c394
SS
7928
7929 add_setshow_boolean_cmd ("observer", no_class,
7930 &observer_mode_1, _("\
7931Set whether gdb controls the inferior in observer mode."), _("\
7932Show whether gdb controls the inferior in observer mode."), _("\
7933In observer mode, GDB can get data from the inferior, but not\n\
7934affect its execution. Registers and memory may not be changed,\n\
7935breakpoints may not be set, and the program cannot be interrupted\n\
7936or signalled."),
7937 set_observer_mode,
7938 show_observer_mode,
7939 &setlist,
7940 &showlist);
c906108c 7941}
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