1 /* Target-struct-independent code to start (run) and stop an inferior
4 Copyright (C) 1986-2013 Free Software Foundation, Inc.
6 This file is part of GDB.
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
10 the Free Software Foundation; either version 3 of the License, or
11 (at your option) any later version.
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.
18 You should have received a copy of the GNU General Public License
19 along with this program. If not, see <http://www.gnu.org/licenses/>. */
22 #include "gdb_string.h"
27 #include "exceptions.h"
28 #include "breakpoint.h"
32 #include "cli/cli-script.h"
34 #include "gdbthread.h"
46 #include "dictionary.h"
48 #include "gdb_assert.h"
49 #include "mi/mi-common.h"
50 #include "event-top.h"
52 #include "record-full.h"
53 #include "inline-frame.h"
55 #include "tracepoint.h"
56 #include "continuations.h"
61 #include "completer.h"
62 #include "target-descriptions.h"
64 /* Prototypes for local functions */
66 static void signals_info (char *, int);
68 static void handle_command (char *, int);
70 static void sig_print_info (enum gdb_signal
);
72 static void sig_print_header (void);
74 static void resume_cleanups (void *);
76 static int hook_stop_stub (void *);
78 static int restore_selected_frame (void *);
80 static int follow_fork (void);
82 static void set_schedlock_func (char *args
, int from_tty
,
83 struct cmd_list_element
*c
);
85 static int currently_stepping (struct thread_info
*tp
);
87 static int currently_stepping_or_nexting_callback (struct thread_info
*tp
,
90 static void xdb_handle_command (char *args
, int from_tty
);
92 static int prepare_to_proceed (int);
94 static void print_exited_reason (int exitstatus
);
96 static void print_signal_exited_reason (enum gdb_signal siggnal
);
98 static void print_no_history_reason (void);
100 static void print_signal_received_reason (enum gdb_signal siggnal
);
102 static void print_end_stepping_range_reason (void);
104 void _initialize_infrun (void);
106 void nullify_last_target_wait_ptid (void);
108 static void insert_hp_step_resume_breakpoint_at_frame (struct frame_info
*);
110 static void insert_step_resume_breakpoint_at_caller (struct frame_info
*);
112 static void insert_longjmp_resume_breakpoint (struct gdbarch
*, CORE_ADDR
);
114 /* When set, stop the 'step' command if we enter a function which has
115 no line number information. The normal behavior is that we step
116 over such function. */
117 int step_stop_if_no_debug
= 0;
119 show_step_stop_if_no_debug (struct ui_file
*file
, int from_tty
,
120 struct cmd_list_element
*c
, const char *value
)
122 fprintf_filtered (file
, _("Mode of the step operation is %s.\n"), value
);
125 /* In asynchronous mode, but simulating synchronous execution. */
127 int sync_execution
= 0;
129 /* wait_for_inferior and normal_stop use this to notify the user
130 when the inferior stopped in a different thread than it had been
133 static ptid_t previous_inferior_ptid
;
135 /* If set (default for legacy reasons), when following a fork, GDB
136 will detach from one of the fork branches, child or parent.
137 Exactly which branch is detached depends on 'set follow-fork-mode'
140 static int detach_fork
= 1;
142 int debug_displaced
= 0;
144 show_debug_displaced (struct ui_file
*file
, int from_tty
,
145 struct cmd_list_element
*c
, const char *value
)
147 fprintf_filtered (file
, _("Displace stepping debugging is %s.\n"), value
);
150 unsigned int debug_infrun
= 0;
152 show_debug_infrun (struct ui_file
*file
, int from_tty
,
153 struct cmd_list_element
*c
, const char *value
)
155 fprintf_filtered (file
, _("Inferior debugging is %s.\n"), value
);
159 /* Support for disabling address space randomization. */
161 int disable_randomization
= 1;
164 show_disable_randomization (struct ui_file
*file
, int from_tty
,
165 struct cmd_list_element
*c
, const char *value
)
167 if (target_supports_disable_randomization ())
168 fprintf_filtered (file
,
169 _("Disabling randomization of debuggee's "
170 "virtual address space is %s.\n"),
173 fputs_filtered (_("Disabling randomization of debuggee's "
174 "virtual address space is unsupported on\n"
175 "this platform.\n"), file
);
179 set_disable_randomization (char *args
, int from_tty
,
180 struct cmd_list_element
*c
)
182 if (!target_supports_disable_randomization ())
183 error (_("Disabling randomization of debuggee's "
184 "virtual address space is unsupported on\n"
188 /* User interface for non-stop mode. */
191 static int non_stop_1
= 0;
194 set_non_stop (char *args
, int from_tty
,
195 struct cmd_list_element
*c
)
197 if (target_has_execution
)
199 non_stop_1
= non_stop
;
200 error (_("Cannot change this setting while the inferior is running."));
203 non_stop
= non_stop_1
;
207 show_non_stop (struct ui_file
*file
, int from_tty
,
208 struct cmd_list_element
*c
, const char *value
)
210 fprintf_filtered (file
,
211 _("Controlling the inferior in non-stop mode is %s.\n"),
215 /* "Observer mode" is somewhat like a more extreme version of
216 non-stop, in which all GDB operations that might affect the
217 target's execution have been disabled. */
219 int observer_mode
= 0;
220 static int observer_mode_1
= 0;
223 set_observer_mode (char *args
, int from_tty
,
224 struct cmd_list_element
*c
)
226 if (target_has_execution
)
228 observer_mode_1
= observer_mode
;
229 error (_("Cannot change this setting while the inferior is running."));
232 observer_mode
= observer_mode_1
;
234 may_write_registers
= !observer_mode
;
235 may_write_memory
= !observer_mode
;
236 may_insert_breakpoints
= !observer_mode
;
237 may_insert_tracepoints
= !observer_mode
;
238 /* We can insert fast tracepoints in or out of observer mode,
239 but enable them if we're going into this mode. */
241 may_insert_fast_tracepoints
= 1;
242 may_stop
= !observer_mode
;
243 update_target_permissions ();
245 /* Going *into* observer mode we must force non-stop, then
246 going out we leave it that way. */
249 target_async_permitted
= 1;
250 pagination_enabled
= 0;
251 non_stop
= non_stop_1
= 1;
255 printf_filtered (_("Observer mode is now %s.\n"),
256 (observer_mode
? "on" : "off"));
260 show_observer_mode (struct ui_file
*file
, int from_tty
,
261 struct cmd_list_element
*c
, const char *value
)
263 fprintf_filtered (file
, _("Observer mode is %s.\n"), value
);
266 /* This updates the value of observer mode based on changes in
267 permissions. Note that we are deliberately ignoring the values of
268 may-write-registers and may-write-memory, since the user may have
269 reason to enable these during a session, for instance to turn on a
270 debugging-related global. */
273 update_observer_mode (void)
277 newval
= (!may_insert_breakpoints
278 && !may_insert_tracepoints
279 && may_insert_fast_tracepoints
283 /* Let the user know if things change. */
284 if (newval
!= observer_mode
)
285 printf_filtered (_("Observer mode is now %s.\n"),
286 (newval
? "on" : "off"));
288 observer_mode
= observer_mode_1
= newval
;
291 /* Tables of how to react to signals; the user sets them. */
293 static unsigned char *signal_stop
;
294 static unsigned char *signal_print
;
295 static unsigned char *signal_program
;
297 /* Table of signals that are registered with "catch signal". A
298 non-zero entry indicates that the signal is caught by some "catch
299 signal" command. This has size GDB_SIGNAL_LAST, to accommodate all
301 static unsigned char *signal_catch
;
303 /* Table of signals that the target may silently handle.
304 This is automatically determined from the flags above,
305 and simply cached here. */
306 static unsigned char *signal_pass
;
308 #define SET_SIGS(nsigs,sigs,flags) \
310 int signum = (nsigs); \
311 while (signum-- > 0) \
312 if ((sigs)[signum]) \
313 (flags)[signum] = 1; \
316 #define UNSET_SIGS(nsigs,sigs,flags) \
318 int signum = (nsigs); \
319 while (signum-- > 0) \
320 if ((sigs)[signum]) \
321 (flags)[signum] = 0; \
324 /* Update the target's copy of SIGNAL_PROGRAM. The sole purpose of
325 this function is to avoid exporting `signal_program'. */
328 update_signals_program_target (void)
330 target_program_signals ((int) GDB_SIGNAL_LAST
, signal_program
);
333 /* Value to pass to target_resume() to cause all threads to resume. */
335 #define RESUME_ALL minus_one_ptid
337 /* Command list pointer for the "stop" placeholder. */
339 static struct cmd_list_element
*stop_command
;
341 /* Function inferior was in as of last step command. */
343 static struct symbol
*step_start_function
;
345 /* Nonzero if we want to give control to the user when we're notified
346 of shared library events by the dynamic linker. */
347 int stop_on_solib_events
;
349 /* Enable or disable optional shared library event breakpoints
350 as appropriate when the above flag is changed. */
353 set_stop_on_solib_events (char *args
, int from_tty
, struct cmd_list_element
*c
)
355 update_solib_breakpoints ();
359 show_stop_on_solib_events (struct ui_file
*file
, int from_tty
,
360 struct cmd_list_element
*c
, const char *value
)
362 fprintf_filtered (file
, _("Stopping for shared library events is %s.\n"),
366 /* Nonzero means expecting a trace trap
367 and should stop the inferior and return silently when it happens. */
371 /* Save register contents here when executing a "finish" command or are
372 about to pop a stack dummy frame, if-and-only-if proceed_to_finish is set.
373 Thus this contains the return value from the called function (assuming
374 values are returned in a register). */
376 struct regcache
*stop_registers
;
378 /* Nonzero after stop if current stack frame should be printed. */
380 static int stop_print_frame
;
382 /* This is a cached copy of the pid/waitstatus of the last event
383 returned by target_wait()/deprecated_target_wait_hook(). This
384 information is returned by get_last_target_status(). */
385 static ptid_t target_last_wait_ptid
;
386 static struct target_waitstatus target_last_waitstatus
;
388 static void context_switch (ptid_t ptid
);
390 void init_thread_stepping_state (struct thread_info
*tss
);
392 static void init_infwait_state (void);
394 static const char follow_fork_mode_child
[] = "child";
395 static const char follow_fork_mode_parent
[] = "parent";
397 static const char *const follow_fork_mode_kind_names
[] = {
398 follow_fork_mode_child
,
399 follow_fork_mode_parent
,
403 static const char *follow_fork_mode_string
= follow_fork_mode_parent
;
405 show_follow_fork_mode_string (struct ui_file
*file
, int from_tty
,
406 struct cmd_list_element
*c
, const char *value
)
408 fprintf_filtered (file
,
409 _("Debugger response to a program "
410 "call of fork or vfork is \"%s\".\n"),
415 /* Tell the target to follow the fork we're stopped at. Returns true
416 if the inferior should be resumed; false, if the target for some
417 reason decided it's best not to resume. */
422 int follow_child
= (follow_fork_mode_string
== follow_fork_mode_child
);
423 int should_resume
= 1;
424 struct thread_info
*tp
;
426 /* Copy user stepping state to the new inferior thread. FIXME: the
427 followed fork child thread should have a copy of most of the
428 parent thread structure's run control related fields, not just these.
429 Initialized to avoid "may be used uninitialized" warnings from gcc. */
430 struct breakpoint
*step_resume_breakpoint
= NULL
;
431 struct breakpoint
*exception_resume_breakpoint
= NULL
;
432 CORE_ADDR step_range_start
= 0;
433 CORE_ADDR step_range_end
= 0;
434 struct frame_id step_frame_id
= { 0 };
439 struct target_waitstatus wait_status
;
441 /* Get the last target status returned by target_wait(). */
442 get_last_target_status (&wait_ptid
, &wait_status
);
444 /* If not stopped at a fork event, then there's nothing else to
446 if (wait_status
.kind
!= TARGET_WAITKIND_FORKED
447 && wait_status
.kind
!= TARGET_WAITKIND_VFORKED
)
450 /* Check if we switched over from WAIT_PTID, since the event was
452 if (!ptid_equal (wait_ptid
, minus_one_ptid
)
453 && !ptid_equal (inferior_ptid
, wait_ptid
))
455 /* We did. Switch back to WAIT_PTID thread, to tell the
456 target to follow it (in either direction). We'll
457 afterwards refuse to resume, and inform the user what
459 switch_to_thread (wait_ptid
);
464 tp
= inferior_thread ();
466 /* If there were any forks/vforks that were caught and are now to be
467 followed, then do so now. */
468 switch (tp
->pending_follow
.kind
)
470 case TARGET_WAITKIND_FORKED
:
471 case TARGET_WAITKIND_VFORKED
:
473 ptid_t parent
, child
;
475 /* If the user did a next/step, etc, over a fork call,
476 preserve the stepping state in the fork child. */
477 if (follow_child
&& should_resume
)
479 step_resume_breakpoint
= clone_momentary_breakpoint
480 (tp
->control
.step_resume_breakpoint
);
481 step_range_start
= tp
->control
.step_range_start
;
482 step_range_end
= tp
->control
.step_range_end
;
483 step_frame_id
= tp
->control
.step_frame_id
;
484 exception_resume_breakpoint
485 = clone_momentary_breakpoint (tp
->control
.exception_resume_breakpoint
);
487 /* For now, delete the parent's sr breakpoint, otherwise,
488 parent/child sr breakpoints are considered duplicates,
489 and the child version will not be installed. Remove
490 this when the breakpoints module becomes aware of
491 inferiors and address spaces. */
492 delete_step_resume_breakpoint (tp
);
493 tp
->control
.step_range_start
= 0;
494 tp
->control
.step_range_end
= 0;
495 tp
->control
.step_frame_id
= null_frame_id
;
496 delete_exception_resume_breakpoint (tp
);
499 parent
= inferior_ptid
;
500 child
= tp
->pending_follow
.value
.related_pid
;
502 /* Tell the target to do whatever is necessary to follow
503 either parent or child. */
504 if (target_follow_fork (follow_child
, detach_fork
))
506 /* Target refused to follow, or there's some other reason
507 we shouldn't resume. */
512 /* This pending follow fork event is now handled, one way
513 or another. The previous selected thread may be gone
514 from the lists by now, but if it is still around, need
515 to clear the pending follow request. */
516 tp
= find_thread_ptid (parent
);
518 tp
->pending_follow
.kind
= TARGET_WAITKIND_SPURIOUS
;
520 /* This makes sure we don't try to apply the "Switched
521 over from WAIT_PID" logic above. */
522 nullify_last_target_wait_ptid ();
524 /* If we followed the child, switch to it... */
527 switch_to_thread (child
);
529 /* ... and preserve the stepping state, in case the
530 user was stepping over the fork call. */
533 tp
= inferior_thread ();
534 tp
->control
.step_resume_breakpoint
535 = step_resume_breakpoint
;
536 tp
->control
.step_range_start
= step_range_start
;
537 tp
->control
.step_range_end
= step_range_end
;
538 tp
->control
.step_frame_id
= step_frame_id
;
539 tp
->control
.exception_resume_breakpoint
540 = exception_resume_breakpoint
;
544 /* If we get here, it was because we're trying to
545 resume from a fork catchpoint, but, the user
546 has switched threads away from the thread that
547 forked. In that case, the resume command
548 issued is most likely not applicable to the
549 child, so just warn, and refuse to resume. */
550 warning (_("Not resuming: switched threads "
551 "before following fork child.\n"));
554 /* Reset breakpoints in the child as appropriate. */
555 follow_inferior_reset_breakpoints ();
558 switch_to_thread (parent
);
562 case TARGET_WAITKIND_SPURIOUS
:
563 /* Nothing to follow. */
566 internal_error (__FILE__
, __LINE__
,
567 "Unexpected pending_follow.kind %d\n",
568 tp
->pending_follow
.kind
);
572 return should_resume
;
576 follow_inferior_reset_breakpoints (void)
578 struct thread_info
*tp
= inferior_thread ();
580 /* Was there a step_resume breakpoint? (There was if the user
581 did a "next" at the fork() call.) If so, explicitly reset its
584 step_resumes are a form of bp that are made to be per-thread.
585 Since we created the step_resume bp when the parent process
586 was being debugged, and now are switching to the child process,
587 from the breakpoint package's viewpoint, that's a switch of
588 "threads". We must update the bp's notion of which thread
589 it is for, or it'll be ignored when it triggers. */
591 if (tp
->control
.step_resume_breakpoint
)
592 breakpoint_re_set_thread (tp
->control
.step_resume_breakpoint
);
594 if (tp
->control
.exception_resume_breakpoint
)
595 breakpoint_re_set_thread (tp
->control
.exception_resume_breakpoint
);
597 /* Reinsert all breakpoints in the child. The user may have set
598 breakpoints after catching the fork, in which case those
599 were never set in the child, but only in the parent. This makes
600 sure the inserted breakpoints match the breakpoint list. */
602 breakpoint_re_set ();
603 insert_breakpoints ();
606 /* The child has exited or execed: resume threads of the parent the
607 user wanted to be executing. */
610 proceed_after_vfork_done (struct thread_info
*thread
,
613 int pid
= * (int *) arg
;
615 if (ptid_get_pid (thread
->ptid
) == pid
616 && is_running (thread
->ptid
)
617 && !is_executing (thread
->ptid
)
618 && !thread
->stop_requested
619 && thread
->suspend
.stop_signal
== GDB_SIGNAL_0
)
622 fprintf_unfiltered (gdb_stdlog
,
623 "infrun: resuming vfork parent thread %s\n",
624 target_pid_to_str (thread
->ptid
));
626 switch_to_thread (thread
->ptid
);
627 clear_proceed_status ();
628 proceed ((CORE_ADDR
) -1, GDB_SIGNAL_DEFAULT
, 0);
634 /* Called whenever we notice an exec or exit event, to handle
635 detaching or resuming a vfork parent. */
638 handle_vfork_child_exec_or_exit (int exec
)
640 struct inferior
*inf
= current_inferior ();
642 if (inf
->vfork_parent
)
644 int resume_parent
= -1;
646 /* This exec or exit marks the end of the shared memory region
647 between the parent and the child. If the user wanted to
648 detach from the parent, now is the time. */
650 if (inf
->vfork_parent
->pending_detach
)
652 struct thread_info
*tp
;
653 struct cleanup
*old_chain
;
654 struct program_space
*pspace
;
655 struct address_space
*aspace
;
657 /* follow-fork child, detach-on-fork on. */
659 inf
->vfork_parent
->pending_detach
= 0;
663 /* If we're handling a child exit, then inferior_ptid
664 points at the inferior's pid, not to a thread. */
665 old_chain
= save_inferior_ptid ();
666 save_current_program_space ();
667 save_current_inferior ();
670 old_chain
= save_current_space_and_thread ();
672 /* We're letting loose of the parent. */
673 tp
= any_live_thread_of_process (inf
->vfork_parent
->pid
);
674 switch_to_thread (tp
->ptid
);
676 /* We're about to detach from the parent, which implicitly
677 removes breakpoints from its address space. There's a
678 catch here: we want to reuse the spaces for the child,
679 but, parent/child are still sharing the pspace at this
680 point, although the exec in reality makes the kernel give
681 the child a fresh set of new pages. The problem here is
682 that the breakpoints module being unaware of this, would
683 likely chose the child process to write to the parent
684 address space. Swapping the child temporarily away from
685 the spaces has the desired effect. Yes, this is "sort
688 pspace
= inf
->pspace
;
689 aspace
= inf
->aspace
;
693 if (debug_infrun
|| info_verbose
)
695 target_terminal_ours ();
698 fprintf_filtered (gdb_stdlog
,
699 "Detaching vfork parent process "
700 "%d after child exec.\n",
701 inf
->vfork_parent
->pid
);
703 fprintf_filtered (gdb_stdlog
,
704 "Detaching vfork parent process "
705 "%d after child exit.\n",
706 inf
->vfork_parent
->pid
);
709 target_detach (NULL
, 0);
712 inf
->pspace
= pspace
;
713 inf
->aspace
= aspace
;
715 do_cleanups (old_chain
);
719 /* We're staying attached to the parent, so, really give the
720 child a new address space. */
721 inf
->pspace
= add_program_space (maybe_new_address_space ());
722 inf
->aspace
= inf
->pspace
->aspace
;
724 set_current_program_space (inf
->pspace
);
726 resume_parent
= inf
->vfork_parent
->pid
;
728 /* Break the bonds. */
729 inf
->vfork_parent
->vfork_child
= NULL
;
733 struct cleanup
*old_chain
;
734 struct program_space
*pspace
;
736 /* If this is a vfork child exiting, then the pspace and
737 aspaces were shared with the parent. Since we're
738 reporting the process exit, we'll be mourning all that is
739 found in the address space, and switching to null_ptid,
740 preparing to start a new inferior. But, since we don't
741 want to clobber the parent's address/program spaces, we
742 go ahead and create a new one for this exiting
745 /* Switch to null_ptid, so that clone_program_space doesn't want
746 to read the selected frame of a dead process. */
747 old_chain
= save_inferior_ptid ();
748 inferior_ptid
= null_ptid
;
750 /* This inferior is dead, so avoid giving the breakpoints
751 module the option to write through to it (cloning a
752 program space resets breakpoints). */
755 pspace
= add_program_space (maybe_new_address_space ());
756 set_current_program_space (pspace
);
758 inf
->symfile_flags
= SYMFILE_NO_READ
;
759 clone_program_space (pspace
, inf
->vfork_parent
->pspace
);
760 inf
->pspace
= pspace
;
761 inf
->aspace
= pspace
->aspace
;
763 /* Put back inferior_ptid. We'll continue mourning this
765 do_cleanups (old_chain
);
767 resume_parent
= inf
->vfork_parent
->pid
;
768 /* Break the bonds. */
769 inf
->vfork_parent
->vfork_child
= NULL
;
772 inf
->vfork_parent
= NULL
;
774 gdb_assert (current_program_space
== inf
->pspace
);
776 if (non_stop
&& resume_parent
!= -1)
778 /* If the user wanted the parent to be running, let it go
780 struct cleanup
*old_chain
= make_cleanup_restore_current_thread ();
783 fprintf_unfiltered (gdb_stdlog
,
784 "infrun: resuming vfork parent process %d\n",
787 iterate_over_threads (proceed_after_vfork_done
, &resume_parent
);
789 do_cleanups (old_chain
);
794 /* Enum strings for "set|show follow-exec-mode". */
796 static const char follow_exec_mode_new
[] = "new";
797 static const char follow_exec_mode_same
[] = "same";
798 static const char *const follow_exec_mode_names
[] =
800 follow_exec_mode_new
,
801 follow_exec_mode_same
,
805 static const char *follow_exec_mode_string
= follow_exec_mode_same
;
807 show_follow_exec_mode_string (struct ui_file
*file
, int from_tty
,
808 struct cmd_list_element
*c
, const char *value
)
810 fprintf_filtered (file
, _("Follow exec mode is \"%s\".\n"), value
);
813 /* EXECD_PATHNAME is assumed to be non-NULL. */
816 follow_exec (ptid_t pid
, char *execd_pathname
)
818 struct thread_info
*th
= inferior_thread ();
819 struct inferior
*inf
= current_inferior ();
821 /* This is an exec event that we actually wish to pay attention to.
822 Refresh our symbol table to the newly exec'd program, remove any
825 If there are breakpoints, they aren't really inserted now,
826 since the exec() transformed our inferior into a fresh set
829 We want to preserve symbolic breakpoints on the list, since
830 we have hopes that they can be reset after the new a.out's
831 symbol table is read.
833 However, any "raw" breakpoints must be removed from the list
834 (e.g., the solib bp's), since their address is probably invalid
837 And, we DON'T want to call delete_breakpoints() here, since
838 that may write the bp's "shadow contents" (the instruction
839 value that was overwritten witha TRAP instruction). Since
840 we now have a new a.out, those shadow contents aren't valid. */
842 mark_breakpoints_out ();
844 update_breakpoints_after_exec ();
846 /* If there was one, it's gone now. We cannot truly step-to-next
847 statement through an exec(). */
848 th
->control
.step_resume_breakpoint
= NULL
;
849 th
->control
.exception_resume_breakpoint
= NULL
;
850 th
->control
.step_range_start
= 0;
851 th
->control
.step_range_end
= 0;
853 /* The target reports the exec event to the main thread, even if
854 some other thread does the exec, and even if the main thread was
855 already stopped --- if debugging in non-stop mode, it's possible
856 the user had the main thread held stopped in the previous image
857 --- release it now. This is the same behavior as step-over-exec
858 with scheduler-locking on in all-stop mode. */
859 th
->stop_requested
= 0;
861 /* What is this a.out's name? */
862 printf_unfiltered (_("%s is executing new program: %s\n"),
863 target_pid_to_str (inferior_ptid
),
866 /* We've followed the inferior through an exec. Therefore, the
867 inferior has essentially been killed & reborn. */
869 gdb_flush (gdb_stdout
);
871 breakpoint_init_inferior (inf_execd
);
873 if (gdb_sysroot
&& *gdb_sysroot
)
875 char *name
= alloca (strlen (gdb_sysroot
)
876 + strlen (execd_pathname
)
879 strcpy (name
, gdb_sysroot
);
880 strcat (name
, execd_pathname
);
881 execd_pathname
= name
;
884 /* Reset the shared library package. This ensures that we get a
885 shlib event when the child reaches "_start", at which point the
886 dld will have had a chance to initialize the child. */
887 /* Also, loading a symbol file below may trigger symbol lookups, and
888 we don't want those to be satisfied by the libraries of the
889 previous incarnation of this process. */
890 no_shared_libraries (NULL
, 0);
892 if (follow_exec_mode_string
== follow_exec_mode_new
)
894 struct program_space
*pspace
;
896 /* The user wants to keep the old inferior and program spaces
897 around. Create a new fresh one, and switch to it. */
899 inf
= add_inferior (current_inferior ()->pid
);
900 pspace
= add_program_space (maybe_new_address_space ());
901 inf
->pspace
= pspace
;
902 inf
->aspace
= pspace
->aspace
;
904 exit_inferior_num_silent (current_inferior ()->num
);
906 set_current_inferior (inf
);
907 set_current_program_space (pspace
);
911 /* The old description may no longer be fit for the new image.
912 E.g, a 64-bit process exec'ed a 32-bit process. Clear the
913 old description; we'll read a new one below. No need to do
914 this on "follow-exec-mode new", as the old inferior stays
915 around (its description is later cleared/refetched on
917 target_clear_description ();
920 gdb_assert (current_program_space
== inf
->pspace
);
922 /* That a.out is now the one to use. */
923 exec_file_attach (execd_pathname
, 0);
925 /* SYMFILE_DEFER_BP_RESET is used as the proper displacement for PIE
926 (Position Independent Executable) main symbol file will get applied by
927 solib_create_inferior_hook below. breakpoint_re_set would fail to insert
928 the breakpoints with the zero displacement. */
930 symbol_file_add (execd_pathname
,
932 | SYMFILE_MAINLINE
| SYMFILE_DEFER_BP_RESET
),
935 if ((inf
->symfile_flags
& SYMFILE_NO_READ
) == 0)
936 set_initial_language ();
938 /* If the target can specify a description, read it. Must do this
939 after flipping to the new executable (because the target supplied
940 description must be compatible with the executable's
941 architecture, and the old executable may e.g., be 32-bit, while
942 the new one 64-bit), and before anything involving memory or
944 target_find_description ();
946 solib_create_inferior_hook (0);
948 jit_inferior_created_hook ();
950 breakpoint_re_set ();
952 /* Reinsert all breakpoints. (Those which were symbolic have
953 been reset to the proper address in the new a.out, thanks
954 to symbol_file_command...). */
955 insert_breakpoints ();
957 /* The next resume of this inferior should bring it to the shlib
958 startup breakpoints. (If the user had also set bp's on
959 "main" from the old (parent) process, then they'll auto-
960 matically get reset there in the new process.). */
963 /* Non-zero if we just simulating a single-step. This is needed
964 because we cannot remove the breakpoints in the inferior process
965 until after the `wait' in `wait_for_inferior'. */
966 static int singlestep_breakpoints_inserted_p
= 0;
968 /* The thread we inserted single-step breakpoints for. */
969 static ptid_t singlestep_ptid
;
971 /* PC when we started this single-step. */
972 static CORE_ADDR singlestep_pc
;
974 /* If another thread hit the singlestep breakpoint, we save the original
975 thread here so that we can resume single-stepping it later. */
976 static ptid_t saved_singlestep_ptid
;
977 static int stepping_past_singlestep_breakpoint
;
979 /* If not equal to null_ptid, this means that after stepping over breakpoint
980 is finished, we need to switch to deferred_step_ptid, and step it.
982 The use case is when one thread has hit a breakpoint, and then the user
983 has switched to another thread and issued 'step'. We need to step over
984 breakpoint in the thread which hit the breakpoint, but then continue
985 stepping the thread user has selected. */
986 static ptid_t deferred_step_ptid
;
988 /* Displaced stepping. */
990 /* In non-stop debugging mode, we must take special care to manage
991 breakpoints properly; in particular, the traditional strategy for
992 stepping a thread past a breakpoint it has hit is unsuitable.
993 'Displaced stepping' is a tactic for stepping one thread past a
994 breakpoint it has hit while ensuring that other threads running
995 concurrently will hit the breakpoint as they should.
997 The traditional way to step a thread T off a breakpoint in a
998 multi-threaded program in all-stop mode is as follows:
1000 a0) Initially, all threads are stopped, and breakpoints are not
1002 a1) We single-step T, leaving breakpoints uninserted.
1003 a2) We insert breakpoints, and resume all threads.
1005 In non-stop debugging, however, this strategy is unsuitable: we
1006 don't want to have to stop all threads in the system in order to
1007 continue or step T past a breakpoint. Instead, we use displaced
1010 n0) Initially, T is stopped, other threads are running, and
1011 breakpoints are inserted.
1012 n1) We copy the instruction "under" the breakpoint to a separate
1013 location, outside the main code stream, making any adjustments
1014 to the instruction, register, and memory state as directed by
1016 n2) We single-step T over the instruction at its new location.
1017 n3) We adjust the resulting register and memory state as directed
1018 by T's architecture. This includes resetting T's PC to point
1019 back into the main instruction stream.
1022 This approach depends on the following gdbarch methods:
1024 - gdbarch_max_insn_length and gdbarch_displaced_step_location
1025 indicate where to copy the instruction, and how much space must
1026 be reserved there. We use these in step n1.
1028 - gdbarch_displaced_step_copy_insn copies a instruction to a new
1029 address, and makes any necessary adjustments to the instruction,
1030 register contents, and memory. We use this in step n1.
1032 - gdbarch_displaced_step_fixup adjusts registers and memory after
1033 we have successfuly single-stepped the instruction, to yield the
1034 same effect the instruction would have had if we had executed it
1035 at its original address. We use this in step n3.
1037 - gdbarch_displaced_step_free_closure provides cleanup.
1039 The gdbarch_displaced_step_copy_insn and
1040 gdbarch_displaced_step_fixup functions must be written so that
1041 copying an instruction with gdbarch_displaced_step_copy_insn,
1042 single-stepping across the copied instruction, and then applying
1043 gdbarch_displaced_insn_fixup should have the same effects on the
1044 thread's memory and registers as stepping the instruction in place
1045 would have. Exactly which responsibilities fall to the copy and
1046 which fall to the fixup is up to the author of those functions.
1048 See the comments in gdbarch.sh for details.
1050 Note that displaced stepping and software single-step cannot
1051 currently be used in combination, although with some care I think
1052 they could be made to. Software single-step works by placing
1053 breakpoints on all possible subsequent instructions; if the
1054 displaced instruction is a PC-relative jump, those breakpoints
1055 could fall in very strange places --- on pages that aren't
1056 executable, or at addresses that are not proper instruction
1057 boundaries. (We do generally let other threads run while we wait
1058 to hit the software single-step breakpoint, and they might
1059 encounter such a corrupted instruction.) One way to work around
1060 this would be to have gdbarch_displaced_step_copy_insn fully
1061 simulate the effect of PC-relative instructions (and return NULL)
1062 on architectures that use software single-stepping.
1064 In non-stop mode, we can have independent and simultaneous step
1065 requests, so more than one thread may need to simultaneously step
1066 over a breakpoint. The current implementation assumes there is
1067 only one scratch space per process. In this case, we have to
1068 serialize access to the scratch space. If thread A wants to step
1069 over a breakpoint, but we are currently waiting for some other
1070 thread to complete a displaced step, we leave thread A stopped and
1071 place it in the displaced_step_request_queue. Whenever a displaced
1072 step finishes, we pick the next thread in the queue and start a new
1073 displaced step operation on it. See displaced_step_prepare and
1074 displaced_step_fixup for details. */
1076 struct displaced_step_request
1079 struct displaced_step_request
*next
;
1082 /* Per-inferior displaced stepping state. */
1083 struct displaced_step_inferior_state
1085 /* Pointer to next in linked list. */
1086 struct displaced_step_inferior_state
*next
;
1088 /* The process this displaced step state refers to. */
1091 /* A queue of pending displaced stepping requests. One entry per
1092 thread that needs to do a displaced step. */
1093 struct displaced_step_request
*step_request_queue
;
1095 /* If this is not null_ptid, this is the thread carrying out a
1096 displaced single-step in process PID. This thread's state will
1097 require fixing up once it has completed its step. */
1100 /* The architecture the thread had when we stepped it. */
1101 struct gdbarch
*step_gdbarch
;
1103 /* The closure provided gdbarch_displaced_step_copy_insn, to be used
1104 for post-step cleanup. */
1105 struct displaced_step_closure
*step_closure
;
1107 /* The address of the original instruction, and the copy we
1109 CORE_ADDR step_original
, step_copy
;
1111 /* Saved contents of copy area. */
1112 gdb_byte
*step_saved_copy
;
1115 /* The list of states of processes involved in displaced stepping
1117 static struct displaced_step_inferior_state
*displaced_step_inferior_states
;
1119 /* Get the displaced stepping state of process PID. */
1121 static struct displaced_step_inferior_state
*
1122 get_displaced_stepping_state (int pid
)
1124 struct displaced_step_inferior_state
*state
;
1126 for (state
= displaced_step_inferior_states
;
1128 state
= state
->next
)
1129 if (state
->pid
== pid
)
1135 /* Add a new displaced stepping state for process PID to the displaced
1136 stepping state list, or return a pointer to an already existing
1137 entry, if it already exists. Never returns NULL. */
1139 static struct displaced_step_inferior_state
*
1140 add_displaced_stepping_state (int pid
)
1142 struct displaced_step_inferior_state
*state
;
1144 for (state
= displaced_step_inferior_states
;
1146 state
= state
->next
)
1147 if (state
->pid
== pid
)
1150 state
= xcalloc (1, sizeof (*state
));
1152 state
->next
= displaced_step_inferior_states
;
1153 displaced_step_inferior_states
= state
;
1158 /* If inferior is in displaced stepping, and ADDR equals to starting address
1159 of copy area, return corresponding displaced_step_closure. Otherwise,
1162 struct displaced_step_closure
*
1163 get_displaced_step_closure_by_addr (CORE_ADDR addr
)
1165 struct displaced_step_inferior_state
*displaced
1166 = get_displaced_stepping_state (ptid_get_pid (inferior_ptid
));
1168 /* If checking the mode of displaced instruction in copy area. */
1169 if (displaced
&& !ptid_equal (displaced
->step_ptid
, null_ptid
)
1170 && (displaced
->step_copy
== addr
))
1171 return displaced
->step_closure
;
1176 /* Remove the displaced stepping state of process PID. */
1179 remove_displaced_stepping_state (int pid
)
1181 struct displaced_step_inferior_state
*it
, **prev_next_p
;
1183 gdb_assert (pid
!= 0);
1185 it
= displaced_step_inferior_states
;
1186 prev_next_p
= &displaced_step_inferior_states
;
1191 *prev_next_p
= it
->next
;
1196 prev_next_p
= &it
->next
;
1202 infrun_inferior_exit (struct inferior
*inf
)
1204 remove_displaced_stepping_state (inf
->pid
);
1207 /* If ON, and the architecture supports it, GDB will use displaced
1208 stepping to step over breakpoints. If OFF, or if the architecture
1209 doesn't support it, GDB will instead use the traditional
1210 hold-and-step approach. If AUTO (which is the default), GDB will
1211 decide which technique to use to step over breakpoints depending on
1212 which of all-stop or non-stop mode is active --- displaced stepping
1213 in non-stop mode; hold-and-step in all-stop mode. */
1215 static enum auto_boolean can_use_displaced_stepping
= AUTO_BOOLEAN_AUTO
;
1218 show_can_use_displaced_stepping (struct ui_file
*file
, int from_tty
,
1219 struct cmd_list_element
*c
,
1222 if (can_use_displaced_stepping
== AUTO_BOOLEAN_AUTO
)
1223 fprintf_filtered (file
,
1224 _("Debugger's willingness to use displaced stepping "
1225 "to step over breakpoints is %s (currently %s).\n"),
1226 value
, non_stop
? "on" : "off");
1228 fprintf_filtered (file
,
1229 _("Debugger's willingness to use displaced stepping "
1230 "to step over breakpoints is %s.\n"), value
);
1233 /* Return non-zero if displaced stepping can/should be used to step
1234 over breakpoints. */
1237 use_displaced_stepping (struct gdbarch
*gdbarch
)
1239 return (((can_use_displaced_stepping
== AUTO_BOOLEAN_AUTO
&& non_stop
)
1240 || can_use_displaced_stepping
== AUTO_BOOLEAN_TRUE
)
1241 && gdbarch_displaced_step_copy_insn_p (gdbarch
)
1242 && !RECORD_IS_USED
);
1245 /* Clean out any stray displaced stepping state. */
1247 displaced_step_clear (struct displaced_step_inferior_state
*displaced
)
1249 /* Indicate that there is no cleanup pending. */
1250 displaced
->step_ptid
= null_ptid
;
1252 if (displaced
->step_closure
)
1254 gdbarch_displaced_step_free_closure (displaced
->step_gdbarch
,
1255 displaced
->step_closure
);
1256 displaced
->step_closure
= NULL
;
1261 displaced_step_clear_cleanup (void *arg
)
1263 struct displaced_step_inferior_state
*state
= arg
;
1265 displaced_step_clear (state
);
1268 /* Dump LEN bytes at BUF in hex to FILE, followed by a newline. */
1270 displaced_step_dump_bytes (struct ui_file
*file
,
1271 const gdb_byte
*buf
,
1276 for (i
= 0; i
< len
; i
++)
1277 fprintf_unfiltered (file
, "%02x ", buf
[i
]);
1278 fputs_unfiltered ("\n", file
);
1281 /* Prepare to single-step, using displaced stepping.
1283 Note that we cannot use displaced stepping when we have a signal to
1284 deliver. If we have a signal to deliver and an instruction to step
1285 over, then after the step, there will be no indication from the
1286 target whether the thread entered a signal handler or ignored the
1287 signal and stepped over the instruction successfully --- both cases
1288 result in a simple SIGTRAP. In the first case we mustn't do a
1289 fixup, and in the second case we must --- but we can't tell which.
1290 Comments in the code for 'random signals' in handle_inferior_event
1291 explain how we handle this case instead.
1293 Returns 1 if preparing was successful -- this thread is going to be
1294 stepped now; or 0 if displaced stepping this thread got queued. */
1296 displaced_step_prepare (ptid_t ptid
)
1298 struct cleanup
*old_cleanups
, *ignore_cleanups
;
1299 struct thread_info
*tp
= find_thread_ptid (ptid
);
1300 struct regcache
*regcache
= get_thread_regcache (ptid
);
1301 struct gdbarch
*gdbarch
= get_regcache_arch (regcache
);
1302 CORE_ADDR original
, copy
;
1304 struct displaced_step_closure
*closure
;
1305 struct displaced_step_inferior_state
*displaced
;
1308 /* We should never reach this function if the architecture does not
1309 support displaced stepping. */
1310 gdb_assert (gdbarch_displaced_step_copy_insn_p (gdbarch
));
1312 /* Disable range stepping while executing in the scratch pad. We
1313 want a single-step even if executing the displaced instruction in
1314 the scratch buffer lands within the stepping range (e.g., a
1316 tp
->control
.may_range_step
= 0;
1318 /* We have to displaced step one thread at a time, as we only have
1319 access to a single scratch space per inferior. */
1321 displaced
= add_displaced_stepping_state (ptid_get_pid (ptid
));
1323 if (!ptid_equal (displaced
->step_ptid
, null_ptid
))
1325 /* Already waiting for a displaced step to finish. Defer this
1326 request and place in queue. */
1327 struct displaced_step_request
*req
, *new_req
;
1329 if (debug_displaced
)
1330 fprintf_unfiltered (gdb_stdlog
,
1331 "displaced: defering step of %s\n",
1332 target_pid_to_str (ptid
));
1334 new_req
= xmalloc (sizeof (*new_req
));
1335 new_req
->ptid
= ptid
;
1336 new_req
->next
= NULL
;
1338 if (displaced
->step_request_queue
)
1340 for (req
= displaced
->step_request_queue
;
1344 req
->next
= new_req
;
1347 displaced
->step_request_queue
= new_req
;
1353 if (debug_displaced
)
1354 fprintf_unfiltered (gdb_stdlog
,
1355 "displaced: stepping %s now\n",
1356 target_pid_to_str (ptid
));
1359 displaced_step_clear (displaced
);
1361 old_cleanups
= save_inferior_ptid ();
1362 inferior_ptid
= ptid
;
1364 original
= regcache_read_pc (regcache
);
1366 copy
= gdbarch_displaced_step_location (gdbarch
);
1367 len
= gdbarch_max_insn_length (gdbarch
);
1369 /* Save the original contents of the copy area. */
1370 displaced
->step_saved_copy
= xmalloc (len
);
1371 ignore_cleanups
= make_cleanup (free_current_contents
,
1372 &displaced
->step_saved_copy
);
1373 status
= target_read_memory (copy
, displaced
->step_saved_copy
, len
);
1375 throw_error (MEMORY_ERROR
,
1376 _("Error accessing memory address %s (%s) for "
1377 "displaced-stepping scratch space."),
1378 paddress (gdbarch
, copy
), safe_strerror (status
));
1379 if (debug_displaced
)
1381 fprintf_unfiltered (gdb_stdlog
, "displaced: saved %s: ",
1382 paddress (gdbarch
, copy
));
1383 displaced_step_dump_bytes (gdb_stdlog
,
1384 displaced
->step_saved_copy
,
1388 closure
= gdbarch_displaced_step_copy_insn (gdbarch
,
1389 original
, copy
, regcache
);
1391 /* We don't support the fully-simulated case at present. */
1392 gdb_assert (closure
);
1394 /* Save the information we need to fix things up if the step
1396 displaced
->step_ptid
= ptid
;
1397 displaced
->step_gdbarch
= gdbarch
;
1398 displaced
->step_closure
= closure
;
1399 displaced
->step_original
= original
;
1400 displaced
->step_copy
= copy
;
1402 make_cleanup (displaced_step_clear_cleanup
, displaced
);
1404 /* Resume execution at the copy. */
1405 regcache_write_pc (regcache
, copy
);
1407 discard_cleanups (ignore_cleanups
);
1409 do_cleanups (old_cleanups
);
1411 if (debug_displaced
)
1412 fprintf_unfiltered (gdb_stdlog
, "displaced: displaced pc to %s\n",
1413 paddress (gdbarch
, copy
));
1419 write_memory_ptid (ptid_t ptid
, CORE_ADDR memaddr
,
1420 const gdb_byte
*myaddr
, int len
)
1422 struct cleanup
*ptid_cleanup
= save_inferior_ptid ();
1424 inferior_ptid
= ptid
;
1425 write_memory (memaddr
, myaddr
, len
);
1426 do_cleanups (ptid_cleanup
);
1429 /* Restore the contents of the copy area for thread PTID. */
1432 displaced_step_restore (struct displaced_step_inferior_state
*displaced
,
1435 ULONGEST len
= gdbarch_max_insn_length (displaced
->step_gdbarch
);
1437 write_memory_ptid (ptid
, displaced
->step_copy
,
1438 displaced
->step_saved_copy
, len
);
1439 if (debug_displaced
)
1440 fprintf_unfiltered (gdb_stdlog
, "displaced: restored %s %s\n",
1441 target_pid_to_str (ptid
),
1442 paddress (displaced
->step_gdbarch
,
1443 displaced
->step_copy
));
1447 displaced_step_fixup (ptid_t event_ptid
, enum gdb_signal signal
)
1449 struct cleanup
*old_cleanups
;
1450 struct displaced_step_inferior_state
*displaced
1451 = get_displaced_stepping_state (ptid_get_pid (event_ptid
));
1453 /* Was any thread of this process doing a displaced step? */
1454 if (displaced
== NULL
)
1457 /* Was this event for the pid we displaced? */
1458 if (ptid_equal (displaced
->step_ptid
, null_ptid
)
1459 || ! ptid_equal (displaced
->step_ptid
, event_ptid
))
1462 old_cleanups
= make_cleanup (displaced_step_clear_cleanup
, displaced
);
1464 displaced_step_restore (displaced
, displaced
->step_ptid
);
1466 /* Did the instruction complete successfully? */
1467 if (signal
== GDB_SIGNAL_TRAP
)
1469 /* Fix up the resulting state. */
1470 gdbarch_displaced_step_fixup (displaced
->step_gdbarch
,
1471 displaced
->step_closure
,
1472 displaced
->step_original
,
1473 displaced
->step_copy
,
1474 get_thread_regcache (displaced
->step_ptid
));
1478 /* Since the instruction didn't complete, all we can do is
1480 struct regcache
*regcache
= get_thread_regcache (event_ptid
);
1481 CORE_ADDR pc
= regcache_read_pc (regcache
);
1483 pc
= displaced
->step_original
+ (pc
- displaced
->step_copy
);
1484 regcache_write_pc (regcache
, pc
);
1487 do_cleanups (old_cleanups
);
1489 displaced
->step_ptid
= null_ptid
;
1491 /* Are there any pending displaced stepping requests? If so, run
1492 one now. Leave the state object around, since we're likely to
1493 need it again soon. */
1494 while (displaced
->step_request_queue
)
1496 struct displaced_step_request
*head
;
1498 struct regcache
*regcache
;
1499 struct gdbarch
*gdbarch
;
1500 CORE_ADDR actual_pc
;
1501 struct address_space
*aspace
;
1503 head
= displaced
->step_request_queue
;
1505 displaced
->step_request_queue
= head
->next
;
1508 context_switch (ptid
);
1510 regcache
= get_thread_regcache (ptid
);
1511 actual_pc
= regcache_read_pc (regcache
);
1512 aspace
= get_regcache_aspace (regcache
);
1514 if (breakpoint_here_p (aspace
, actual_pc
))
1516 if (debug_displaced
)
1517 fprintf_unfiltered (gdb_stdlog
,
1518 "displaced: stepping queued %s now\n",
1519 target_pid_to_str (ptid
));
1521 displaced_step_prepare (ptid
);
1523 gdbarch
= get_regcache_arch (regcache
);
1525 if (debug_displaced
)
1527 CORE_ADDR actual_pc
= regcache_read_pc (regcache
);
1530 fprintf_unfiltered (gdb_stdlog
, "displaced: run %s: ",
1531 paddress (gdbarch
, actual_pc
));
1532 read_memory (actual_pc
, buf
, sizeof (buf
));
1533 displaced_step_dump_bytes (gdb_stdlog
, buf
, sizeof (buf
));
1536 if (gdbarch_displaced_step_hw_singlestep (gdbarch
,
1537 displaced
->step_closure
))
1538 target_resume (ptid
, 1, GDB_SIGNAL_0
);
1540 target_resume (ptid
, 0, GDB_SIGNAL_0
);
1542 /* Done, we're stepping a thread. */
1548 struct thread_info
*tp
= inferior_thread ();
1550 /* The breakpoint we were sitting under has since been
1552 tp
->control
.trap_expected
= 0;
1554 /* Go back to what we were trying to do. */
1555 step
= currently_stepping (tp
);
1557 if (debug_displaced
)
1558 fprintf_unfiltered (gdb_stdlog
,
1559 "displaced: breakpoint is gone: %s, step(%d)\n",
1560 target_pid_to_str (tp
->ptid
), step
);
1562 target_resume (ptid
, step
, GDB_SIGNAL_0
);
1563 tp
->suspend
.stop_signal
= GDB_SIGNAL_0
;
1565 /* This request was discarded. See if there's any other
1566 thread waiting for its turn. */
1571 /* Update global variables holding ptids to hold NEW_PTID if they were
1572 holding OLD_PTID. */
1574 infrun_thread_ptid_changed (ptid_t old_ptid
, ptid_t new_ptid
)
1576 struct displaced_step_request
*it
;
1577 struct displaced_step_inferior_state
*displaced
;
1579 if (ptid_equal (inferior_ptid
, old_ptid
))
1580 inferior_ptid
= new_ptid
;
1582 if (ptid_equal (singlestep_ptid
, old_ptid
))
1583 singlestep_ptid
= new_ptid
;
1585 if (ptid_equal (deferred_step_ptid
, old_ptid
))
1586 deferred_step_ptid
= new_ptid
;
1588 for (displaced
= displaced_step_inferior_states
;
1590 displaced
= displaced
->next
)
1592 if (ptid_equal (displaced
->step_ptid
, old_ptid
))
1593 displaced
->step_ptid
= new_ptid
;
1595 for (it
= displaced
->step_request_queue
; it
; it
= it
->next
)
1596 if (ptid_equal (it
->ptid
, old_ptid
))
1597 it
->ptid
= new_ptid
;
1604 /* Things to clean up if we QUIT out of resume (). */
1606 resume_cleanups (void *ignore
)
1611 static const char schedlock_off
[] = "off";
1612 static const char schedlock_on
[] = "on";
1613 static const char schedlock_step
[] = "step";
1614 static const char *const scheduler_enums
[] = {
1620 static const char *scheduler_mode
= schedlock_off
;
1622 show_scheduler_mode (struct ui_file
*file
, int from_tty
,
1623 struct cmd_list_element
*c
, const char *value
)
1625 fprintf_filtered (file
,
1626 _("Mode for locking scheduler "
1627 "during execution is \"%s\".\n"),
1632 set_schedlock_func (char *args
, int from_tty
, struct cmd_list_element
*c
)
1634 if (!target_can_lock_scheduler
)
1636 scheduler_mode
= schedlock_off
;
1637 error (_("Target '%s' cannot support this command."), target_shortname
);
1641 /* True if execution commands resume all threads of all processes by
1642 default; otherwise, resume only threads of the current inferior
1644 int sched_multi
= 0;
1646 /* Try to setup for software single stepping over the specified location.
1647 Return 1 if target_resume() should use hardware single step.
1649 GDBARCH the current gdbarch.
1650 PC the location to step over. */
1653 maybe_software_singlestep (struct gdbarch
*gdbarch
, CORE_ADDR pc
)
1657 if (execution_direction
== EXEC_FORWARD
1658 && gdbarch_software_single_step_p (gdbarch
)
1659 && gdbarch_software_single_step (gdbarch
, get_current_frame ()))
1662 /* Do not pull these breakpoints until after a `wait' in
1663 `wait_for_inferior'. */
1664 singlestep_breakpoints_inserted_p
= 1;
1665 singlestep_ptid
= inferior_ptid
;
1671 /* Return a ptid representing the set of threads that we will proceed,
1672 in the perspective of the user/frontend. We may actually resume
1673 fewer threads at first, e.g., if a thread is stopped at a
1674 breakpoint that needs stepping-off, but that should not be visible
1675 to the user/frontend, and neither should the frontend/user be
1676 allowed to proceed any of the threads that happen to be stopped for
1677 internal run control handling, if a previous command wanted them
1681 user_visible_resume_ptid (int step
)
1683 /* By default, resume all threads of all processes. */
1684 ptid_t resume_ptid
= RESUME_ALL
;
1686 /* Maybe resume only all threads of the current process. */
1687 if (!sched_multi
&& target_supports_multi_process ())
1689 resume_ptid
= pid_to_ptid (ptid_get_pid (inferior_ptid
));
1692 /* Maybe resume a single thread after all. */
1695 /* With non-stop mode on, threads are always handled
1697 resume_ptid
= inferior_ptid
;
1699 else if ((scheduler_mode
== schedlock_on
)
1700 || (scheduler_mode
== schedlock_step
1701 && (step
|| singlestep_breakpoints_inserted_p
)))
1703 /* User-settable 'scheduler' mode requires solo thread resume. */
1704 resume_ptid
= inferior_ptid
;
1710 /* Resume the inferior, but allow a QUIT. This is useful if the user
1711 wants to interrupt some lengthy single-stepping operation
1712 (for child processes, the SIGINT goes to the inferior, and so
1713 we get a SIGINT random_signal, but for remote debugging and perhaps
1714 other targets, that's not true).
1716 STEP nonzero if we should step (zero to continue instead).
1717 SIG is the signal to give the inferior (zero for none). */
1719 resume (int step
, enum gdb_signal sig
)
1721 int should_resume
= 1;
1722 struct cleanup
*old_cleanups
= make_cleanup (resume_cleanups
, 0);
1723 struct regcache
*regcache
= get_current_regcache ();
1724 struct gdbarch
*gdbarch
= get_regcache_arch (regcache
);
1725 struct thread_info
*tp
= inferior_thread ();
1726 CORE_ADDR pc
= regcache_read_pc (regcache
);
1727 struct address_space
*aspace
= get_regcache_aspace (regcache
);
1731 if (current_inferior ()->waiting_for_vfork_done
)
1733 /* Don't try to single-step a vfork parent that is waiting for
1734 the child to get out of the shared memory region (by exec'ing
1735 or exiting). This is particularly important on software
1736 single-step archs, as the child process would trip on the
1737 software single step breakpoint inserted for the parent
1738 process. Since the parent will not actually execute any
1739 instruction until the child is out of the shared region (such
1740 are vfork's semantics), it is safe to simply continue it.
1741 Eventually, we'll see a TARGET_WAITKIND_VFORK_DONE event for
1742 the parent, and tell it to `keep_going', which automatically
1743 re-sets it stepping. */
1745 fprintf_unfiltered (gdb_stdlog
,
1746 "infrun: resume : clear step\n");
1751 fprintf_unfiltered (gdb_stdlog
,
1752 "infrun: resume (step=%d, signal=%d), "
1753 "trap_expected=%d, current thread [%s] at %s\n",
1754 step
, sig
, tp
->control
.trap_expected
,
1755 target_pid_to_str (inferior_ptid
),
1756 paddress (gdbarch
, pc
));
1758 /* Normally, by the time we reach `resume', the breakpoints are either
1759 removed or inserted, as appropriate. The exception is if we're sitting
1760 at a permanent breakpoint; we need to step over it, but permanent
1761 breakpoints can't be removed. So we have to test for it here. */
1762 if (breakpoint_here_p (aspace
, pc
) == permanent_breakpoint_here
)
1764 if (gdbarch_skip_permanent_breakpoint_p (gdbarch
))
1765 gdbarch_skip_permanent_breakpoint (gdbarch
, regcache
);
1768 The program is stopped at a permanent breakpoint, but GDB does not know\n\
1769 how to step past a permanent breakpoint on this architecture. Try using\n\
1770 a command like `return' or `jump' to continue execution."));
1773 /* If we have a breakpoint to step over, make sure to do a single
1774 step only. Same if we have software watchpoints. */
1775 if (tp
->control
.trap_expected
|| bpstat_should_step ())
1776 tp
->control
.may_range_step
= 0;
1778 /* If enabled, step over breakpoints by executing a copy of the
1779 instruction at a different address.
1781 We can't use displaced stepping when we have a signal to deliver;
1782 the comments for displaced_step_prepare explain why. The
1783 comments in the handle_inferior event for dealing with 'random
1784 signals' explain what we do instead.
1786 We can't use displaced stepping when we are waiting for vfork_done
1787 event, displaced stepping breaks the vfork child similarly as single
1788 step software breakpoint. */
1789 if (use_displaced_stepping (gdbarch
)
1790 && (tp
->control
.trap_expected
1791 || (step
&& gdbarch_software_single_step_p (gdbarch
)))
1792 && sig
== GDB_SIGNAL_0
1793 && !current_inferior ()->waiting_for_vfork_done
)
1795 struct displaced_step_inferior_state
*displaced
;
1797 if (!displaced_step_prepare (inferior_ptid
))
1799 /* Got placed in displaced stepping queue. Will be resumed
1800 later when all the currently queued displaced stepping
1801 requests finish. The thread is not executing at this point,
1802 and the call to set_executing will be made later. But we
1803 need to call set_running here, since from frontend point of view,
1804 the thread is running. */
1805 set_running (inferior_ptid
, 1);
1806 discard_cleanups (old_cleanups
);
1810 /* Update pc to reflect the new address from which we will execute
1811 instructions due to displaced stepping. */
1812 pc
= regcache_read_pc (get_thread_regcache (inferior_ptid
));
1814 displaced
= get_displaced_stepping_state (ptid_get_pid (inferior_ptid
));
1815 step
= gdbarch_displaced_step_hw_singlestep (gdbarch
,
1816 displaced
->step_closure
);
1819 /* Do we need to do it the hard way, w/temp breakpoints? */
1821 step
= maybe_software_singlestep (gdbarch
, pc
);
1823 /* Currently, our software single-step implementation leads to different
1824 results than hardware single-stepping in one situation: when stepping
1825 into delivering a signal which has an associated signal handler,
1826 hardware single-step will stop at the first instruction of the handler,
1827 while software single-step will simply skip execution of the handler.
1829 For now, this difference in behavior is accepted since there is no
1830 easy way to actually implement single-stepping into a signal handler
1831 without kernel support.
1833 However, there is one scenario where this difference leads to follow-on
1834 problems: if we're stepping off a breakpoint by removing all breakpoints
1835 and then single-stepping. In this case, the software single-step
1836 behavior means that even if there is a *breakpoint* in the signal
1837 handler, GDB still would not stop.
1839 Fortunately, we can at least fix this particular issue. We detect
1840 here the case where we are about to deliver a signal while software
1841 single-stepping with breakpoints removed. In this situation, we
1842 revert the decisions to remove all breakpoints and insert single-
1843 step breakpoints, and instead we install a step-resume breakpoint
1844 at the current address, deliver the signal without stepping, and
1845 once we arrive back at the step-resume breakpoint, actually step
1846 over the breakpoint we originally wanted to step over. */
1847 if (singlestep_breakpoints_inserted_p
1848 && tp
->control
.trap_expected
&& sig
!= GDB_SIGNAL_0
)
1850 /* If we have nested signals or a pending signal is delivered
1851 immediately after a handler returns, might might already have
1852 a step-resume breakpoint set on the earlier handler. We cannot
1853 set another step-resume breakpoint; just continue on until the
1854 original breakpoint is hit. */
1855 if (tp
->control
.step_resume_breakpoint
== NULL
)
1857 insert_hp_step_resume_breakpoint_at_frame (get_current_frame ());
1858 tp
->step_after_step_resume_breakpoint
= 1;
1861 remove_single_step_breakpoints ();
1862 singlestep_breakpoints_inserted_p
= 0;
1864 insert_breakpoints ();
1865 tp
->control
.trap_expected
= 0;
1872 /* If STEP is set, it's a request to use hardware stepping
1873 facilities. But in that case, we should never
1874 use singlestep breakpoint. */
1875 gdb_assert (!(singlestep_breakpoints_inserted_p
&& step
));
1877 /* Decide the set of threads to ask the target to resume. Start
1878 by assuming everything will be resumed, than narrow the set
1879 by applying increasingly restricting conditions. */
1880 resume_ptid
= user_visible_resume_ptid (step
);
1882 /* Maybe resume a single thread after all. */
1883 if (singlestep_breakpoints_inserted_p
1884 && stepping_past_singlestep_breakpoint
)
1886 /* The situation here is as follows. In thread T1 we wanted to
1887 single-step. Lacking hardware single-stepping we've
1888 set breakpoint at the PC of the next instruction -- call it
1889 P. After resuming, we've hit that breakpoint in thread T2.
1890 Now we've removed original breakpoint, inserted breakpoint
1891 at P+1, and try to step to advance T2 past breakpoint.
1892 We need to step only T2, as if T1 is allowed to freely run,
1893 it can run past P, and if other threads are allowed to run,
1894 they can hit breakpoint at P+1, and nested hits of single-step
1895 breakpoints is not something we'd want -- that's complicated
1896 to support, and has no value. */
1897 resume_ptid
= inferior_ptid
;
1899 else if ((step
|| singlestep_breakpoints_inserted_p
)
1900 && tp
->control
.trap_expected
)
1902 /* We're allowing a thread to run past a breakpoint it has
1903 hit, by single-stepping the thread with the breakpoint
1904 removed. In which case, we need to single-step only this
1905 thread, and keep others stopped, as they can miss this
1906 breakpoint if allowed to run.
1908 The current code actually removes all breakpoints when
1909 doing this, not just the one being stepped over, so if we
1910 let other threads run, we can actually miss any
1911 breakpoint, not just the one at PC. */
1912 resume_ptid
= inferior_ptid
;
1915 if (gdbarch_cannot_step_breakpoint (gdbarch
))
1917 /* Most targets can step a breakpoint instruction, thus
1918 executing it normally. But if this one cannot, just
1919 continue and we will hit it anyway. */
1920 if (step
&& breakpoint_inserted_here_p (aspace
, pc
))
1925 && use_displaced_stepping (gdbarch
)
1926 && tp
->control
.trap_expected
)
1928 struct regcache
*resume_regcache
= get_thread_regcache (resume_ptid
);
1929 struct gdbarch
*resume_gdbarch
= get_regcache_arch (resume_regcache
);
1930 CORE_ADDR actual_pc
= regcache_read_pc (resume_regcache
);
1933 fprintf_unfiltered (gdb_stdlog
, "displaced: run %s: ",
1934 paddress (resume_gdbarch
, actual_pc
));
1935 read_memory (actual_pc
, buf
, sizeof (buf
));
1936 displaced_step_dump_bytes (gdb_stdlog
, buf
, sizeof (buf
));
1939 if (tp
->control
.may_range_step
)
1941 /* If we're resuming a thread with the PC out of the step
1942 range, then we're doing some nested/finer run control
1943 operation, like stepping the thread out of the dynamic
1944 linker or the displaced stepping scratch pad. We
1945 shouldn't have allowed a range step then. */
1946 gdb_assert (pc_in_thread_step_range (pc
, tp
));
1949 /* Install inferior's terminal modes. */
1950 target_terminal_inferior ();
1952 /* Avoid confusing the next resume, if the next stop/resume
1953 happens to apply to another thread. */
1954 tp
->suspend
.stop_signal
= GDB_SIGNAL_0
;
1956 /* Advise target which signals may be handled silently. If we have
1957 removed breakpoints because we are stepping over one (which can
1958 happen only if we are not using displaced stepping), we need to
1959 receive all signals to avoid accidentally skipping a breakpoint
1960 during execution of a signal handler. */
1961 if ((step
|| singlestep_breakpoints_inserted_p
)
1962 && tp
->control
.trap_expected
1963 && !use_displaced_stepping (gdbarch
))
1964 target_pass_signals (0, NULL
);
1966 target_pass_signals ((int) GDB_SIGNAL_LAST
, signal_pass
);
1968 target_resume (resume_ptid
, step
, sig
);
1971 discard_cleanups (old_cleanups
);
1976 /* Clear out all variables saying what to do when inferior is continued.
1977 First do this, then set the ones you want, then call `proceed'. */
1980 clear_proceed_status_thread (struct thread_info
*tp
)
1983 fprintf_unfiltered (gdb_stdlog
,
1984 "infrun: clear_proceed_status_thread (%s)\n",
1985 target_pid_to_str (tp
->ptid
));
1987 tp
->control
.trap_expected
= 0;
1988 tp
->control
.step_range_start
= 0;
1989 tp
->control
.step_range_end
= 0;
1990 tp
->control
.may_range_step
= 0;
1991 tp
->control
.step_frame_id
= null_frame_id
;
1992 tp
->control
.step_stack_frame_id
= null_frame_id
;
1993 tp
->control
.step_over_calls
= STEP_OVER_UNDEBUGGABLE
;
1994 tp
->stop_requested
= 0;
1996 tp
->control
.stop_step
= 0;
1998 tp
->control
.proceed_to_finish
= 0;
2000 /* Discard any remaining commands or status from previous stop. */
2001 bpstat_clear (&tp
->control
.stop_bpstat
);
2005 clear_proceed_status_callback (struct thread_info
*tp
, void *data
)
2007 if (is_exited (tp
->ptid
))
2010 clear_proceed_status_thread (tp
);
2015 clear_proceed_status (void)
2019 /* In all-stop mode, delete the per-thread status of all
2020 threads, even if inferior_ptid is null_ptid, there may be
2021 threads on the list. E.g., we may be launching a new
2022 process, while selecting the executable. */
2023 iterate_over_threads (clear_proceed_status_callback
, NULL
);
2026 if (!ptid_equal (inferior_ptid
, null_ptid
))
2028 struct inferior
*inferior
;
2032 /* If in non-stop mode, only delete the per-thread status of
2033 the current thread. */
2034 clear_proceed_status_thread (inferior_thread ());
2037 inferior
= current_inferior ();
2038 inferior
->control
.stop_soon
= NO_STOP_QUIETLY
;
2041 stop_after_trap
= 0;
2043 observer_notify_about_to_proceed ();
2047 regcache_xfree (stop_registers
);
2048 stop_registers
= NULL
;
2052 /* Check the current thread against the thread that reported the most recent
2053 event. If a step-over is required return TRUE and set the current thread
2054 to the old thread. Otherwise return FALSE.
2056 This should be suitable for any targets that support threads. */
2059 prepare_to_proceed (int step
)
2062 struct target_waitstatus wait_status
;
2063 int schedlock_enabled
;
2065 /* With non-stop mode on, threads are always handled individually. */
2066 gdb_assert (! non_stop
);
2068 /* Get the last target status returned by target_wait(). */
2069 get_last_target_status (&wait_ptid
, &wait_status
);
2071 /* Make sure we were stopped at a breakpoint. */
2072 if (wait_status
.kind
!= TARGET_WAITKIND_STOPPED
2073 || (wait_status
.value
.sig
!= GDB_SIGNAL_TRAP
2074 && wait_status
.value
.sig
!= GDB_SIGNAL_ILL
2075 && wait_status
.value
.sig
!= GDB_SIGNAL_SEGV
2076 && wait_status
.value
.sig
!= GDB_SIGNAL_EMT
))
2081 schedlock_enabled
= (scheduler_mode
== schedlock_on
2082 || (scheduler_mode
== schedlock_step
2085 /* Don't switch over to WAIT_PTID if scheduler locking is on. */
2086 if (schedlock_enabled
)
2089 /* Don't switch over if we're about to resume some other process
2090 other than WAIT_PTID's, and schedule-multiple is off. */
2092 && ptid_get_pid (wait_ptid
) != ptid_get_pid (inferior_ptid
))
2095 /* Switched over from WAIT_PID. */
2096 if (!ptid_equal (wait_ptid
, minus_one_ptid
)
2097 && !ptid_equal (inferior_ptid
, wait_ptid
))
2099 struct regcache
*regcache
= get_thread_regcache (wait_ptid
);
2101 if (breakpoint_here_p (get_regcache_aspace (regcache
),
2102 regcache_read_pc (regcache
)))
2104 /* If stepping, remember current thread to switch back to. */
2106 deferred_step_ptid
= inferior_ptid
;
2108 /* Switch back to WAIT_PID thread. */
2109 switch_to_thread (wait_ptid
);
2112 fprintf_unfiltered (gdb_stdlog
,
2113 "infrun: prepare_to_proceed (step=%d), "
2114 "switched to [%s]\n",
2115 step
, target_pid_to_str (inferior_ptid
));
2117 /* We return 1 to indicate that there is a breakpoint here,
2118 so we need to step over it before continuing to avoid
2119 hitting it straight away. */
2127 /* Basic routine for continuing the program in various fashions.
2129 ADDR is the address to resume at, or -1 for resume where stopped.
2130 SIGGNAL is the signal to give it, or 0 for none,
2131 or -1 for act according to how it stopped.
2132 STEP is nonzero if should trap after one instruction.
2133 -1 means return after that and print nothing.
2134 You should probably set various step_... variables
2135 before calling here, if you are stepping.
2137 You should call clear_proceed_status before calling proceed. */
2140 proceed (CORE_ADDR addr
, enum gdb_signal siggnal
, int step
)
2142 struct regcache
*regcache
;
2143 struct gdbarch
*gdbarch
;
2144 struct thread_info
*tp
;
2146 struct address_space
*aspace
;
2147 /* GDB may force the inferior to step due to various reasons. */
2150 /* If we're stopped at a fork/vfork, follow the branch set by the
2151 "set follow-fork-mode" command; otherwise, we'll just proceed
2152 resuming the current thread. */
2153 if (!follow_fork ())
2155 /* The target for some reason decided not to resume. */
2157 if (target_can_async_p ())
2158 inferior_event_handler (INF_EXEC_COMPLETE
, NULL
);
2162 /* We'll update this if & when we switch to a new thread. */
2163 previous_inferior_ptid
= inferior_ptid
;
2165 regcache
= get_current_regcache ();
2166 gdbarch
= get_regcache_arch (regcache
);
2167 aspace
= get_regcache_aspace (regcache
);
2168 pc
= regcache_read_pc (regcache
);
2171 step_start_function
= find_pc_function (pc
);
2173 stop_after_trap
= 1;
2175 if (addr
== (CORE_ADDR
) -1)
2177 if (pc
== stop_pc
&& breakpoint_here_p (aspace
, pc
)
2178 && execution_direction
!= EXEC_REVERSE
)
2179 /* There is a breakpoint at the address we will resume at,
2180 step one instruction before inserting breakpoints so that
2181 we do not stop right away (and report a second hit at this
2184 Note, we don't do this in reverse, because we won't
2185 actually be executing the breakpoint insn anyway.
2186 We'll be (un-)executing the previous instruction. */
2189 else if (gdbarch_single_step_through_delay_p (gdbarch
)
2190 && gdbarch_single_step_through_delay (gdbarch
,
2191 get_current_frame ()))
2192 /* We stepped onto an instruction that needs to be stepped
2193 again before re-inserting the breakpoint, do so. */
2198 regcache_write_pc (regcache
, addr
);
2202 fprintf_unfiltered (gdb_stdlog
,
2203 "infrun: proceed (addr=%s, signal=%d, step=%d)\n",
2204 paddress (gdbarch
, addr
), siggnal
, step
);
2207 /* In non-stop, each thread is handled individually. The context
2208 must already be set to the right thread here. */
2212 /* In a multi-threaded task we may select another thread and
2213 then continue or step.
2215 But if the old thread was stopped at a breakpoint, it will
2216 immediately cause another breakpoint stop without any
2217 execution (i.e. it will report a breakpoint hit incorrectly).
2218 So we must step over it first.
2220 prepare_to_proceed checks the current thread against the
2221 thread that reported the most recent event. If a step-over
2222 is required it returns TRUE and sets the current thread to
2224 if (prepare_to_proceed (step
))
2228 /* prepare_to_proceed may change the current thread. */
2229 tp
= inferior_thread ();
2233 tp
->control
.trap_expected
= 1;
2234 /* If displaced stepping is enabled, we can step over the
2235 breakpoint without hitting it, so leave all breakpoints
2236 inserted. Otherwise we need to disable all breakpoints, step
2237 one instruction, and then re-add them when that step is
2239 if (!use_displaced_stepping (gdbarch
))
2240 remove_breakpoints ();
2243 /* We can insert breakpoints if we're not trying to step over one,
2244 or if we are stepping over one but we're using displaced stepping
2246 if (! tp
->control
.trap_expected
|| use_displaced_stepping (gdbarch
))
2247 insert_breakpoints ();
2251 /* Pass the last stop signal to the thread we're resuming,
2252 irrespective of whether the current thread is the thread that
2253 got the last event or not. This was historically GDB's
2254 behaviour before keeping a stop_signal per thread. */
2256 struct thread_info
*last_thread
;
2258 struct target_waitstatus last_status
;
2260 get_last_target_status (&last_ptid
, &last_status
);
2261 if (!ptid_equal (inferior_ptid
, last_ptid
)
2262 && !ptid_equal (last_ptid
, null_ptid
)
2263 && !ptid_equal (last_ptid
, minus_one_ptid
))
2265 last_thread
= find_thread_ptid (last_ptid
);
2268 tp
->suspend
.stop_signal
= last_thread
->suspend
.stop_signal
;
2269 last_thread
->suspend
.stop_signal
= GDB_SIGNAL_0
;
2274 if (siggnal
!= GDB_SIGNAL_DEFAULT
)
2275 tp
->suspend
.stop_signal
= siggnal
;
2276 /* If this signal should not be seen by program,
2277 give it zero. Used for debugging signals. */
2278 else if (!signal_program
[tp
->suspend
.stop_signal
])
2279 tp
->suspend
.stop_signal
= GDB_SIGNAL_0
;
2281 annotate_starting ();
2283 /* Make sure that output from GDB appears before output from the
2285 gdb_flush (gdb_stdout
);
2287 /* Refresh prev_pc value just prior to resuming. This used to be
2288 done in stop_stepping, however, setting prev_pc there did not handle
2289 scenarios such as inferior function calls or returning from
2290 a function via the return command. In those cases, the prev_pc
2291 value was not set properly for subsequent commands. The prev_pc value
2292 is used to initialize the starting line number in the ecs. With an
2293 invalid value, the gdb next command ends up stopping at the position
2294 represented by the next line table entry past our start position.
2295 On platforms that generate one line table entry per line, this
2296 is not a problem. However, on the ia64, the compiler generates
2297 extraneous line table entries that do not increase the line number.
2298 When we issue the gdb next command on the ia64 after an inferior call
2299 or a return command, we often end up a few instructions forward, still
2300 within the original line we started.
2302 An attempt was made to refresh the prev_pc at the same time the
2303 execution_control_state is initialized (for instance, just before
2304 waiting for an inferior event). But this approach did not work
2305 because of platforms that use ptrace, where the pc register cannot
2306 be read unless the inferior is stopped. At that point, we are not
2307 guaranteed the inferior is stopped and so the regcache_read_pc() call
2308 can fail. Setting the prev_pc value here ensures the value is updated
2309 correctly when the inferior is stopped. */
2310 tp
->prev_pc
= regcache_read_pc (get_current_regcache ());
2312 /* Fill in with reasonable starting values. */
2313 init_thread_stepping_state (tp
);
2315 /* Reset to normal state. */
2316 init_infwait_state ();
2318 /* Resume inferior. */
2319 resume (force_step
|| step
|| bpstat_should_step (),
2320 tp
->suspend
.stop_signal
);
2322 /* Wait for it to stop (if not standalone)
2323 and in any case decode why it stopped, and act accordingly. */
2324 /* Do this only if we are not using the event loop, or if the target
2325 does not support asynchronous execution. */
2326 if (!target_can_async_p ())
2328 wait_for_inferior ();
2334 /* Start remote-debugging of a machine over a serial link. */
2337 start_remote (int from_tty
)
2339 struct inferior
*inferior
;
2341 inferior
= current_inferior ();
2342 inferior
->control
.stop_soon
= STOP_QUIETLY_REMOTE
;
2344 /* Always go on waiting for the target, regardless of the mode. */
2345 /* FIXME: cagney/1999-09-23: At present it isn't possible to
2346 indicate to wait_for_inferior that a target should timeout if
2347 nothing is returned (instead of just blocking). Because of this,
2348 targets expecting an immediate response need to, internally, set
2349 things up so that the target_wait() is forced to eventually
2351 /* FIXME: cagney/1999-09-24: It isn't possible for target_open() to
2352 differentiate to its caller what the state of the target is after
2353 the initial open has been performed. Here we're assuming that
2354 the target has stopped. It should be possible to eventually have
2355 target_open() return to the caller an indication that the target
2356 is currently running and GDB state should be set to the same as
2357 for an async run. */
2358 wait_for_inferior ();
2360 /* Now that the inferior has stopped, do any bookkeeping like
2361 loading shared libraries. We want to do this before normal_stop,
2362 so that the displayed frame is up to date. */
2363 post_create_inferior (¤t_target
, from_tty
);
2368 /* Initialize static vars when a new inferior begins. */
2371 init_wait_for_inferior (void)
2373 /* These are meaningless until the first time through wait_for_inferior. */
2375 breakpoint_init_inferior (inf_starting
);
2377 clear_proceed_status ();
2379 stepping_past_singlestep_breakpoint
= 0;
2380 deferred_step_ptid
= null_ptid
;
2382 target_last_wait_ptid
= minus_one_ptid
;
2384 previous_inferior_ptid
= inferior_ptid
;
2385 init_infwait_state ();
2387 /* Discard any skipped inlined frames. */
2388 clear_inline_frame_state (minus_one_ptid
);
2392 /* This enum encodes possible reasons for doing a target_wait, so that
2393 wfi can call target_wait in one place. (Ultimately the call will be
2394 moved out of the infinite loop entirely.) */
2398 infwait_normal_state
,
2399 infwait_thread_hop_state
,
2400 infwait_step_watch_state
,
2401 infwait_nonstep_watch_state
2404 /* The PTID we'll do a target_wait on.*/
2407 /* Current inferior wait state. */
2408 static enum infwait_states infwait_state
;
2410 /* Data to be passed around while handling an event. This data is
2411 discarded between events. */
2412 struct execution_control_state
2415 /* The thread that got the event, if this was a thread event; NULL
2417 struct thread_info
*event_thread
;
2419 struct target_waitstatus ws
;
2421 int stop_func_filled_in
;
2422 CORE_ADDR stop_func_start
;
2423 CORE_ADDR stop_func_end
;
2424 const char *stop_func_name
;
2428 static void handle_inferior_event (struct execution_control_state
*ecs
);
2430 static void handle_step_into_function (struct gdbarch
*gdbarch
,
2431 struct execution_control_state
*ecs
);
2432 static void handle_step_into_function_backward (struct gdbarch
*gdbarch
,
2433 struct execution_control_state
*ecs
);
2434 static void check_exception_resume (struct execution_control_state
*,
2435 struct frame_info
*);
2437 static void stop_stepping (struct execution_control_state
*ecs
);
2438 static void prepare_to_wait (struct execution_control_state
*ecs
);
2439 static void keep_going (struct execution_control_state
*ecs
);
2441 /* Callback for iterate over threads. If the thread is stopped, but
2442 the user/frontend doesn't know about that yet, go through
2443 normal_stop, as if the thread had just stopped now. ARG points at
2444 a ptid. If PTID is MINUS_ONE_PTID, applies to all threads. If
2445 ptid_is_pid(PTID) is true, applies to all threads of the process
2446 pointed at by PTID. Otherwise, apply only to the thread pointed by
2450 infrun_thread_stop_requested_callback (struct thread_info
*info
, void *arg
)
2452 ptid_t ptid
= * (ptid_t
*) arg
;
2454 if ((ptid_equal (info
->ptid
, ptid
)
2455 || ptid_equal (minus_one_ptid
, ptid
)
2456 || (ptid_is_pid (ptid
)
2457 && ptid_get_pid (ptid
) == ptid_get_pid (info
->ptid
)))
2458 && is_running (info
->ptid
)
2459 && !is_executing (info
->ptid
))
2461 struct cleanup
*old_chain
;
2462 struct execution_control_state ecss
;
2463 struct execution_control_state
*ecs
= &ecss
;
2465 memset (ecs
, 0, sizeof (*ecs
));
2467 old_chain
= make_cleanup_restore_current_thread ();
2469 /* Go through handle_inferior_event/normal_stop, so we always
2470 have consistent output as if the stop event had been
2472 ecs
->ptid
= info
->ptid
;
2473 ecs
->event_thread
= find_thread_ptid (info
->ptid
);
2474 ecs
->ws
.kind
= TARGET_WAITKIND_STOPPED
;
2475 ecs
->ws
.value
.sig
= GDB_SIGNAL_0
;
2477 handle_inferior_event (ecs
);
2479 if (!ecs
->wait_some_more
)
2481 struct thread_info
*tp
;
2485 /* Finish off the continuations. */
2486 tp
= inferior_thread ();
2487 do_all_intermediate_continuations_thread (tp
, 1);
2488 do_all_continuations_thread (tp
, 1);
2491 do_cleanups (old_chain
);
2497 /* This function is attached as a "thread_stop_requested" observer.
2498 Cleanup local state that assumed the PTID was to be resumed, and
2499 report the stop to the frontend. */
2502 infrun_thread_stop_requested (ptid_t ptid
)
2504 struct displaced_step_inferior_state
*displaced
;
2506 /* PTID was requested to stop. Remove it from the displaced
2507 stepping queue, so we don't try to resume it automatically. */
2509 for (displaced
= displaced_step_inferior_states
;
2511 displaced
= displaced
->next
)
2513 struct displaced_step_request
*it
, **prev_next_p
;
2515 it
= displaced
->step_request_queue
;
2516 prev_next_p
= &displaced
->step_request_queue
;
2519 if (ptid_match (it
->ptid
, ptid
))
2521 *prev_next_p
= it
->next
;
2527 prev_next_p
= &it
->next
;
2534 iterate_over_threads (infrun_thread_stop_requested_callback
, &ptid
);
2538 infrun_thread_thread_exit (struct thread_info
*tp
, int silent
)
2540 if (ptid_equal (target_last_wait_ptid
, tp
->ptid
))
2541 nullify_last_target_wait_ptid ();
2544 /* Callback for iterate_over_threads. */
2547 delete_step_resume_breakpoint_callback (struct thread_info
*info
, void *data
)
2549 if (is_exited (info
->ptid
))
2552 delete_step_resume_breakpoint (info
);
2553 delete_exception_resume_breakpoint (info
);
2557 /* In all-stop, delete the step resume breakpoint of any thread that
2558 had one. In non-stop, delete the step resume breakpoint of the
2559 thread that just stopped. */
2562 delete_step_thread_step_resume_breakpoint (void)
2564 if (!target_has_execution
2565 || ptid_equal (inferior_ptid
, null_ptid
))
2566 /* If the inferior has exited, we have already deleted the step
2567 resume breakpoints out of GDB's lists. */
2572 /* If in non-stop mode, only delete the step-resume or
2573 longjmp-resume breakpoint of the thread that just stopped
2575 struct thread_info
*tp
= inferior_thread ();
2577 delete_step_resume_breakpoint (tp
);
2578 delete_exception_resume_breakpoint (tp
);
2581 /* In all-stop mode, delete all step-resume and longjmp-resume
2582 breakpoints of any thread that had them. */
2583 iterate_over_threads (delete_step_resume_breakpoint_callback
, NULL
);
2586 /* A cleanup wrapper. */
2589 delete_step_thread_step_resume_breakpoint_cleanup (void *arg
)
2591 delete_step_thread_step_resume_breakpoint ();
2594 /* Pretty print the results of target_wait, for debugging purposes. */
2597 print_target_wait_results (ptid_t waiton_ptid
, ptid_t result_ptid
,
2598 const struct target_waitstatus
*ws
)
2600 char *status_string
= target_waitstatus_to_string (ws
);
2601 struct ui_file
*tmp_stream
= mem_fileopen ();
2604 /* The text is split over several lines because it was getting too long.
2605 Call fprintf_unfiltered (gdb_stdlog) once so that the text is still
2606 output as a unit; we want only one timestamp printed if debug_timestamp
2609 fprintf_unfiltered (tmp_stream
,
2610 "infrun: target_wait (%d", ptid_get_pid (waiton_ptid
));
2611 if (ptid_get_pid (waiton_ptid
) != -1)
2612 fprintf_unfiltered (tmp_stream
,
2613 " [%s]", target_pid_to_str (waiton_ptid
));
2614 fprintf_unfiltered (tmp_stream
, ", status) =\n");
2615 fprintf_unfiltered (tmp_stream
,
2616 "infrun: %d [%s],\n",
2617 ptid_get_pid (result_ptid
),
2618 target_pid_to_str (result_ptid
));
2619 fprintf_unfiltered (tmp_stream
,
2623 text
= ui_file_xstrdup (tmp_stream
, NULL
);
2625 /* This uses %s in part to handle %'s in the text, but also to avoid
2626 a gcc error: the format attribute requires a string literal. */
2627 fprintf_unfiltered (gdb_stdlog
, "%s", text
);
2629 xfree (status_string
);
2631 ui_file_delete (tmp_stream
);
2634 /* Prepare and stabilize the inferior for detaching it. E.g.,
2635 detaching while a thread is displaced stepping is a recipe for
2636 crashing it, as nothing would readjust the PC out of the scratch
2640 prepare_for_detach (void)
2642 struct inferior
*inf
= current_inferior ();
2643 ptid_t pid_ptid
= pid_to_ptid (inf
->pid
);
2644 struct cleanup
*old_chain_1
;
2645 struct displaced_step_inferior_state
*displaced
;
2647 displaced
= get_displaced_stepping_state (inf
->pid
);
2649 /* Is any thread of this process displaced stepping? If not,
2650 there's nothing else to do. */
2651 if (displaced
== NULL
|| ptid_equal (displaced
->step_ptid
, null_ptid
))
2655 fprintf_unfiltered (gdb_stdlog
,
2656 "displaced-stepping in-process while detaching");
2658 old_chain_1
= make_cleanup_restore_integer (&inf
->detaching
);
2661 while (!ptid_equal (displaced
->step_ptid
, null_ptid
))
2663 struct cleanup
*old_chain_2
;
2664 struct execution_control_state ecss
;
2665 struct execution_control_state
*ecs
;
2668 memset (ecs
, 0, sizeof (*ecs
));
2670 overlay_cache_invalid
= 1;
2672 if (deprecated_target_wait_hook
)
2673 ecs
->ptid
= deprecated_target_wait_hook (pid_ptid
, &ecs
->ws
, 0);
2675 ecs
->ptid
= target_wait (pid_ptid
, &ecs
->ws
, 0);
2678 print_target_wait_results (pid_ptid
, ecs
->ptid
, &ecs
->ws
);
2680 /* If an error happens while handling the event, propagate GDB's
2681 knowledge of the executing state to the frontend/user running
2683 old_chain_2
= make_cleanup (finish_thread_state_cleanup
,
2686 /* Now figure out what to do with the result of the result. */
2687 handle_inferior_event (ecs
);
2689 /* No error, don't finish the state yet. */
2690 discard_cleanups (old_chain_2
);
2692 /* Breakpoints and watchpoints are not installed on the target
2693 at this point, and signals are passed directly to the
2694 inferior, so this must mean the process is gone. */
2695 if (!ecs
->wait_some_more
)
2697 discard_cleanups (old_chain_1
);
2698 error (_("Program exited while detaching"));
2702 discard_cleanups (old_chain_1
);
2705 /* Wait for control to return from inferior to debugger.
2707 If inferior gets a signal, we may decide to start it up again
2708 instead of returning. That is why there is a loop in this function.
2709 When this function actually returns it means the inferior
2710 should be left stopped and GDB should read more commands. */
2713 wait_for_inferior (void)
2715 struct cleanup
*old_cleanups
;
2719 (gdb_stdlog
, "infrun: wait_for_inferior ()\n");
2722 make_cleanup (delete_step_thread_step_resume_breakpoint_cleanup
, NULL
);
2726 struct execution_control_state ecss
;
2727 struct execution_control_state
*ecs
= &ecss
;
2728 struct cleanup
*old_chain
;
2730 memset (ecs
, 0, sizeof (*ecs
));
2732 overlay_cache_invalid
= 1;
2734 if (deprecated_target_wait_hook
)
2735 ecs
->ptid
= deprecated_target_wait_hook (waiton_ptid
, &ecs
->ws
, 0);
2737 ecs
->ptid
= target_wait (waiton_ptid
, &ecs
->ws
, 0);
2740 print_target_wait_results (waiton_ptid
, ecs
->ptid
, &ecs
->ws
);
2742 /* If an error happens while handling the event, propagate GDB's
2743 knowledge of the executing state to the frontend/user running
2745 old_chain
= make_cleanup (finish_thread_state_cleanup
, &minus_one_ptid
);
2747 /* Now figure out what to do with the result of the result. */
2748 handle_inferior_event (ecs
);
2750 /* No error, don't finish the state yet. */
2751 discard_cleanups (old_chain
);
2753 if (!ecs
->wait_some_more
)
2757 do_cleanups (old_cleanups
);
2760 /* Asynchronous version of wait_for_inferior. It is called by the
2761 event loop whenever a change of state is detected on the file
2762 descriptor corresponding to the target. It can be called more than
2763 once to complete a single execution command. In such cases we need
2764 to keep the state in a global variable ECSS. If it is the last time
2765 that this function is called for a single execution command, then
2766 report to the user that the inferior has stopped, and do the
2767 necessary cleanups. */
2770 fetch_inferior_event (void *client_data
)
2772 struct execution_control_state ecss
;
2773 struct execution_control_state
*ecs
= &ecss
;
2774 struct cleanup
*old_chain
= make_cleanup (null_cleanup
, NULL
);
2775 struct cleanup
*ts_old_chain
;
2776 int was_sync
= sync_execution
;
2779 memset (ecs
, 0, sizeof (*ecs
));
2781 /* We're handling a live event, so make sure we're doing live
2782 debugging. If we're looking at traceframes while the target is
2783 running, we're going to need to get back to that mode after
2784 handling the event. */
2787 make_cleanup_restore_current_traceframe ();
2788 set_current_traceframe (-1);
2792 /* In non-stop mode, the user/frontend should not notice a thread
2793 switch due to internal events. Make sure we reverse to the
2794 user selected thread and frame after handling the event and
2795 running any breakpoint commands. */
2796 make_cleanup_restore_current_thread ();
2798 overlay_cache_invalid
= 1;
2800 make_cleanup_restore_integer (&execution_direction
);
2801 execution_direction
= target_execution_direction ();
2803 if (deprecated_target_wait_hook
)
2805 deprecated_target_wait_hook (waiton_ptid
, &ecs
->ws
, TARGET_WNOHANG
);
2807 ecs
->ptid
= target_wait (waiton_ptid
, &ecs
->ws
, TARGET_WNOHANG
);
2810 print_target_wait_results (waiton_ptid
, ecs
->ptid
, &ecs
->ws
);
2812 /* If an error happens while handling the event, propagate GDB's
2813 knowledge of the executing state to the frontend/user running
2816 ts_old_chain
= make_cleanup (finish_thread_state_cleanup
, &minus_one_ptid
);
2818 ts_old_chain
= make_cleanup (finish_thread_state_cleanup
, &ecs
->ptid
);
2820 /* Get executed before make_cleanup_restore_current_thread above to apply
2821 still for the thread which has thrown the exception. */
2822 make_bpstat_clear_actions_cleanup ();
2824 /* Now figure out what to do with the result of the result. */
2825 handle_inferior_event (ecs
);
2827 if (!ecs
->wait_some_more
)
2829 struct inferior
*inf
= find_inferior_pid (ptid_get_pid (ecs
->ptid
));
2831 delete_step_thread_step_resume_breakpoint ();
2833 /* We may not find an inferior if this was a process exit. */
2834 if (inf
== NULL
|| inf
->control
.stop_soon
== NO_STOP_QUIETLY
)
2837 if (target_has_execution
2838 && ecs
->ws
.kind
!= TARGET_WAITKIND_NO_RESUMED
2839 && ecs
->ws
.kind
!= TARGET_WAITKIND_EXITED
2840 && ecs
->ws
.kind
!= TARGET_WAITKIND_SIGNALLED
2841 && ecs
->event_thread
->step_multi
2842 && ecs
->event_thread
->control
.stop_step
)
2843 inferior_event_handler (INF_EXEC_CONTINUE
, NULL
);
2846 inferior_event_handler (INF_EXEC_COMPLETE
, NULL
);
2851 /* No error, don't finish the thread states yet. */
2852 discard_cleanups (ts_old_chain
);
2854 /* Revert thread and frame. */
2855 do_cleanups (old_chain
);
2857 /* If the inferior was in sync execution mode, and now isn't,
2858 restore the prompt (a synchronous execution command has finished,
2859 and we're ready for input). */
2860 if (interpreter_async
&& was_sync
&& !sync_execution
)
2861 display_gdb_prompt (0);
2865 && exec_done_display_p
2866 && (ptid_equal (inferior_ptid
, null_ptid
)
2867 || !is_running (inferior_ptid
)))
2868 printf_unfiltered (_("completed.\n"));
2871 /* Record the frame and location we're currently stepping through. */
2873 set_step_info (struct frame_info
*frame
, struct symtab_and_line sal
)
2875 struct thread_info
*tp
= inferior_thread ();
2877 tp
->control
.step_frame_id
= get_frame_id (frame
);
2878 tp
->control
.step_stack_frame_id
= get_stack_frame_id (frame
);
2880 tp
->current_symtab
= sal
.symtab
;
2881 tp
->current_line
= sal
.line
;
2884 /* Clear context switchable stepping state. */
2887 init_thread_stepping_state (struct thread_info
*tss
)
2889 tss
->stepping_over_breakpoint
= 0;
2890 tss
->step_after_step_resume_breakpoint
= 0;
2893 /* Return the cached copy of the last pid/waitstatus returned by
2894 target_wait()/deprecated_target_wait_hook(). The data is actually
2895 cached by handle_inferior_event(), which gets called immediately
2896 after target_wait()/deprecated_target_wait_hook(). */
2899 get_last_target_status (ptid_t
*ptidp
, struct target_waitstatus
*status
)
2901 *ptidp
= target_last_wait_ptid
;
2902 *status
= target_last_waitstatus
;
2906 nullify_last_target_wait_ptid (void)
2908 target_last_wait_ptid
= minus_one_ptid
;
2911 /* Switch thread contexts. */
2914 context_switch (ptid_t ptid
)
2916 if (debug_infrun
&& !ptid_equal (ptid
, inferior_ptid
))
2918 fprintf_unfiltered (gdb_stdlog
, "infrun: Switching context from %s ",
2919 target_pid_to_str (inferior_ptid
));
2920 fprintf_unfiltered (gdb_stdlog
, "to %s\n",
2921 target_pid_to_str (ptid
));
2924 switch_to_thread (ptid
);
2928 adjust_pc_after_break (struct execution_control_state
*ecs
)
2930 struct regcache
*regcache
;
2931 struct gdbarch
*gdbarch
;
2932 struct address_space
*aspace
;
2933 CORE_ADDR breakpoint_pc
;
2935 /* If we've hit a breakpoint, we'll normally be stopped with SIGTRAP. If
2936 we aren't, just return.
2938 We assume that waitkinds other than TARGET_WAITKIND_STOPPED are not
2939 affected by gdbarch_decr_pc_after_break. Other waitkinds which are
2940 implemented by software breakpoints should be handled through the normal
2943 NOTE drow/2004-01-31: On some targets, breakpoints may generate
2944 different signals (SIGILL or SIGEMT for instance), but it is less
2945 clear where the PC is pointing afterwards. It may not match
2946 gdbarch_decr_pc_after_break. I don't know any specific target that
2947 generates these signals at breakpoints (the code has been in GDB since at
2948 least 1992) so I can not guess how to handle them here.
2950 In earlier versions of GDB, a target with
2951 gdbarch_have_nonsteppable_watchpoint would have the PC after hitting a
2952 watchpoint affected by gdbarch_decr_pc_after_break. I haven't found any
2953 target with both of these set in GDB history, and it seems unlikely to be
2954 correct, so gdbarch_have_nonsteppable_watchpoint is not checked here. */
2956 if (ecs
->ws
.kind
!= TARGET_WAITKIND_STOPPED
)
2959 if (ecs
->ws
.value
.sig
!= GDB_SIGNAL_TRAP
)
2962 /* In reverse execution, when a breakpoint is hit, the instruction
2963 under it has already been de-executed. The reported PC always
2964 points at the breakpoint address, so adjusting it further would
2965 be wrong. E.g., consider this case on a decr_pc_after_break == 1
2968 B1 0x08000000 : INSN1
2969 B2 0x08000001 : INSN2
2971 PC -> 0x08000003 : INSN4
2973 Say you're stopped at 0x08000003 as above. Reverse continuing
2974 from that point should hit B2 as below. Reading the PC when the
2975 SIGTRAP is reported should read 0x08000001 and INSN2 should have
2976 been de-executed already.
2978 B1 0x08000000 : INSN1
2979 B2 PC -> 0x08000001 : INSN2
2983 We can't apply the same logic as for forward execution, because
2984 we would wrongly adjust the PC to 0x08000000, since there's a
2985 breakpoint at PC - 1. We'd then report a hit on B1, although
2986 INSN1 hadn't been de-executed yet. Doing nothing is the correct
2988 if (execution_direction
== EXEC_REVERSE
)
2991 /* If this target does not decrement the PC after breakpoints, then
2992 we have nothing to do. */
2993 regcache
= get_thread_regcache (ecs
->ptid
);
2994 gdbarch
= get_regcache_arch (regcache
);
2995 if (gdbarch_decr_pc_after_break (gdbarch
) == 0)
2998 aspace
= get_regcache_aspace (regcache
);
3000 /* Find the location where (if we've hit a breakpoint) the
3001 breakpoint would be. */
3002 breakpoint_pc
= regcache_read_pc (regcache
)
3003 - gdbarch_decr_pc_after_break (gdbarch
);
3005 /* Check whether there actually is a software breakpoint inserted at
3008 If in non-stop mode, a race condition is possible where we've
3009 removed a breakpoint, but stop events for that breakpoint were
3010 already queued and arrive later. To suppress those spurious
3011 SIGTRAPs, we keep a list of such breakpoint locations for a bit,
3012 and retire them after a number of stop events are reported. */
3013 if (software_breakpoint_inserted_here_p (aspace
, breakpoint_pc
)
3014 || (non_stop
&& moribund_breakpoint_here_p (aspace
, breakpoint_pc
)))
3016 struct cleanup
*old_cleanups
= make_cleanup (null_cleanup
, NULL
);
3019 record_full_gdb_operation_disable_set ();
3021 /* When using hardware single-step, a SIGTRAP is reported for both
3022 a completed single-step and a software breakpoint. Need to
3023 differentiate between the two, as the latter needs adjusting
3024 but the former does not.
3026 The SIGTRAP can be due to a completed hardware single-step only if
3027 - we didn't insert software single-step breakpoints
3028 - the thread to be examined is still the current thread
3029 - this thread is currently being stepped
3031 If any of these events did not occur, we must have stopped due
3032 to hitting a software breakpoint, and have to back up to the
3035 As a special case, we could have hardware single-stepped a
3036 software breakpoint. In this case (prev_pc == breakpoint_pc),
3037 we also need to back up to the breakpoint address. */
3039 if (singlestep_breakpoints_inserted_p
3040 || !ptid_equal (ecs
->ptid
, inferior_ptid
)
3041 || !currently_stepping (ecs
->event_thread
)
3042 || ecs
->event_thread
->prev_pc
== breakpoint_pc
)
3043 regcache_write_pc (regcache
, breakpoint_pc
);
3045 do_cleanups (old_cleanups
);
3050 init_infwait_state (void)
3052 waiton_ptid
= pid_to_ptid (-1);
3053 infwait_state
= infwait_normal_state
;
3057 stepped_in_from (struct frame_info
*frame
, struct frame_id step_frame_id
)
3059 for (frame
= get_prev_frame (frame
);
3061 frame
= get_prev_frame (frame
))
3063 if (frame_id_eq (get_frame_id (frame
), step_frame_id
))
3065 if (get_frame_type (frame
) != INLINE_FRAME
)
3072 /* Auxiliary function that handles syscall entry/return events.
3073 It returns 1 if the inferior should keep going (and GDB
3074 should ignore the event), or 0 if the event deserves to be
3078 handle_syscall_event (struct execution_control_state
*ecs
)
3080 struct regcache
*regcache
;
3083 if (!ptid_equal (ecs
->ptid
, inferior_ptid
))
3084 context_switch (ecs
->ptid
);
3086 regcache
= get_thread_regcache (ecs
->ptid
);
3087 syscall_number
= ecs
->ws
.value
.syscall_number
;
3088 stop_pc
= regcache_read_pc (regcache
);
3090 if (catch_syscall_enabled () > 0
3091 && catching_syscall_number (syscall_number
) > 0)
3093 enum bpstat_signal_value sval
;
3096 fprintf_unfiltered (gdb_stdlog
, "infrun: syscall number = '%d'\n",
3099 ecs
->event_thread
->control
.stop_bpstat
3100 = bpstat_stop_status (get_regcache_aspace (regcache
),
3101 stop_pc
, ecs
->ptid
, &ecs
->ws
);
3103 sval
= bpstat_explains_signal (ecs
->event_thread
->control
.stop_bpstat
,
3105 ecs
->random_signal
= sval
== BPSTAT_SIGNAL_NO
;
3107 if (!ecs
->random_signal
)
3109 /* Catchpoint hit. */
3110 ecs
->event_thread
->suspend
.stop_signal
= GDB_SIGNAL_TRAP
;
3115 /* If no catchpoint triggered for this, then keep going. */
3116 ecs
->event_thread
->suspend
.stop_signal
= GDB_SIGNAL_0
;
3121 /* Clear the supplied execution_control_state's stop_func_* fields. */
3124 clear_stop_func (struct execution_control_state
*ecs
)
3126 ecs
->stop_func_filled_in
= 0;
3127 ecs
->stop_func_start
= 0;
3128 ecs
->stop_func_end
= 0;
3129 ecs
->stop_func_name
= NULL
;
3132 /* Lazily fill in the execution_control_state's stop_func_* fields. */
3135 fill_in_stop_func (struct gdbarch
*gdbarch
,
3136 struct execution_control_state
*ecs
)
3138 if (!ecs
->stop_func_filled_in
)
3140 /* Don't care about return value; stop_func_start and stop_func_name
3141 will both be 0 if it doesn't work. */
3142 find_pc_partial_function (stop_pc
, &ecs
->stop_func_name
,
3143 &ecs
->stop_func_start
, &ecs
->stop_func_end
);
3144 ecs
->stop_func_start
3145 += gdbarch_deprecated_function_start_offset (gdbarch
);
3147 ecs
->stop_func_filled_in
= 1;
3151 /* Given an execution control state that has been freshly filled in
3152 by an event from the inferior, figure out what it means and take
3153 appropriate action. */
3156 handle_inferior_event (struct execution_control_state
*ecs
)
3158 struct frame_info
*frame
;
3159 struct gdbarch
*gdbarch
;
3160 int stopped_by_watchpoint
;
3161 int stepped_after_stopped_by_watchpoint
= 0;
3162 struct symtab_and_line stop_pc_sal
;
3163 enum stop_kind stop_soon
;
3165 if (ecs
->ws
.kind
== TARGET_WAITKIND_IGNORE
)
3167 /* We had an event in the inferior, but we are not interested in
3168 handling it at this level. The lower layers have already
3169 done what needs to be done, if anything.
3171 One of the possible circumstances for this is when the
3172 inferior produces output for the console. The inferior has
3173 not stopped, and we are ignoring the event. Another possible
3174 circumstance is any event which the lower level knows will be
3175 reported multiple times without an intervening resume. */
3177 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_IGNORE\n");
3178 prepare_to_wait (ecs
);
3182 if (ecs
->ws
.kind
== TARGET_WAITKIND_NO_RESUMED
3183 && target_can_async_p () && !sync_execution
)
3185 /* There were no unwaited-for children left in the target, but,
3186 we're not synchronously waiting for events either. Just
3187 ignore. Otherwise, if we were running a synchronous
3188 execution command, we need to cancel it and give the user
3189 back the terminal. */
3191 fprintf_unfiltered (gdb_stdlog
,
3192 "infrun: TARGET_WAITKIND_NO_RESUMED (ignoring)\n");
3193 prepare_to_wait (ecs
);
3197 if (ecs
->ws
.kind
!= TARGET_WAITKIND_EXITED
3198 && ecs
->ws
.kind
!= TARGET_WAITKIND_SIGNALLED
3199 && ecs
->ws
.kind
!= TARGET_WAITKIND_NO_RESUMED
)
3201 struct inferior
*inf
= find_inferior_pid (ptid_get_pid (ecs
->ptid
));
3204 stop_soon
= inf
->control
.stop_soon
;
3207 stop_soon
= NO_STOP_QUIETLY
;
3209 /* Cache the last pid/waitstatus. */
3210 target_last_wait_ptid
= ecs
->ptid
;
3211 target_last_waitstatus
= ecs
->ws
;
3213 /* Always clear state belonging to the previous time we stopped. */
3214 stop_stack_dummy
= STOP_NONE
;
3216 if (ecs
->ws
.kind
== TARGET_WAITKIND_NO_RESUMED
)
3218 /* No unwaited-for children left. IOW, all resumed children
3221 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_NO_RESUMED\n");
3223 stop_print_frame
= 0;
3224 stop_stepping (ecs
);
3228 if (ecs
->ws
.kind
!= TARGET_WAITKIND_EXITED
3229 && ecs
->ws
.kind
!= TARGET_WAITKIND_SIGNALLED
)
3231 ecs
->event_thread
= find_thread_ptid (ecs
->ptid
);
3232 /* If it's a new thread, add it to the thread database. */
3233 if (ecs
->event_thread
== NULL
)
3234 ecs
->event_thread
= add_thread (ecs
->ptid
);
3236 /* Disable range stepping. If the next step request could use a
3237 range, this will be end up re-enabled then. */
3238 ecs
->event_thread
->control
.may_range_step
= 0;
3241 /* Dependent on valid ECS->EVENT_THREAD. */
3242 adjust_pc_after_break (ecs
);
3244 /* Dependent on the current PC value modified by adjust_pc_after_break. */
3245 reinit_frame_cache ();
3247 breakpoint_retire_moribund ();
3249 /* First, distinguish signals caused by the debugger from signals
3250 that have to do with the program's own actions. Note that
3251 breakpoint insns may cause SIGTRAP or SIGILL or SIGEMT, depending
3252 on the operating system version. Here we detect when a SIGILL or
3253 SIGEMT is really a breakpoint and change it to SIGTRAP. We do
3254 something similar for SIGSEGV, since a SIGSEGV will be generated
3255 when we're trying to execute a breakpoint instruction on a
3256 non-executable stack. This happens for call dummy breakpoints
3257 for architectures like SPARC that place call dummies on the
3259 if (ecs
->ws
.kind
== TARGET_WAITKIND_STOPPED
3260 && (ecs
->ws
.value
.sig
== GDB_SIGNAL_ILL
3261 || ecs
->ws
.value
.sig
== GDB_SIGNAL_SEGV
3262 || ecs
->ws
.value
.sig
== GDB_SIGNAL_EMT
))
3264 struct regcache
*regcache
= get_thread_regcache (ecs
->ptid
);
3266 if (breakpoint_inserted_here_p (get_regcache_aspace (regcache
),
3267 regcache_read_pc (regcache
)))
3270 fprintf_unfiltered (gdb_stdlog
,
3271 "infrun: Treating signal as SIGTRAP\n");
3272 ecs
->ws
.value
.sig
= GDB_SIGNAL_TRAP
;
3276 /* Mark the non-executing threads accordingly. In all-stop, all
3277 threads of all processes are stopped when we get any event
3278 reported. In non-stop mode, only the event thread stops. If
3279 we're handling a process exit in non-stop mode, there's nothing
3280 to do, as threads of the dead process are gone, and threads of
3281 any other process were left running. */
3283 set_executing (minus_one_ptid
, 0);
3284 else if (ecs
->ws
.kind
!= TARGET_WAITKIND_SIGNALLED
3285 && ecs
->ws
.kind
!= TARGET_WAITKIND_EXITED
)
3286 set_executing (ecs
->ptid
, 0);
3288 switch (infwait_state
)
3290 case infwait_thread_hop_state
:
3292 fprintf_unfiltered (gdb_stdlog
, "infrun: infwait_thread_hop_state\n");
3295 case infwait_normal_state
:
3297 fprintf_unfiltered (gdb_stdlog
, "infrun: infwait_normal_state\n");
3300 case infwait_step_watch_state
:
3302 fprintf_unfiltered (gdb_stdlog
,
3303 "infrun: infwait_step_watch_state\n");
3305 stepped_after_stopped_by_watchpoint
= 1;
3308 case infwait_nonstep_watch_state
:
3310 fprintf_unfiltered (gdb_stdlog
,
3311 "infrun: infwait_nonstep_watch_state\n");
3312 insert_breakpoints ();
3314 /* FIXME-maybe: is this cleaner than setting a flag? Does it
3315 handle things like signals arriving and other things happening
3316 in combination correctly? */
3317 stepped_after_stopped_by_watchpoint
= 1;
3321 internal_error (__FILE__
, __LINE__
, _("bad switch"));
3324 infwait_state
= infwait_normal_state
;
3325 waiton_ptid
= pid_to_ptid (-1);
3327 switch (ecs
->ws
.kind
)
3329 case TARGET_WAITKIND_LOADED
:
3331 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_LOADED\n");
3332 /* Ignore gracefully during startup of the inferior, as it might
3333 be the shell which has just loaded some objects, otherwise
3334 add the symbols for the newly loaded objects. Also ignore at
3335 the beginning of an attach or remote session; we will query
3336 the full list of libraries once the connection is
3338 if (stop_soon
== NO_STOP_QUIETLY
)
3340 struct regcache
*regcache
;
3341 enum bpstat_signal_value sval
;
3343 if (!ptid_equal (ecs
->ptid
, inferior_ptid
))
3344 context_switch (ecs
->ptid
);
3345 regcache
= get_thread_regcache (ecs
->ptid
);
3347 handle_solib_event ();
3349 ecs
->event_thread
->control
.stop_bpstat
3350 = bpstat_stop_status (get_regcache_aspace (regcache
),
3351 stop_pc
, ecs
->ptid
, &ecs
->ws
);
3354 = bpstat_explains_signal (ecs
->event_thread
->control
.stop_bpstat
,
3356 ecs
->random_signal
= sval
== BPSTAT_SIGNAL_NO
;
3358 if (!ecs
->random_signal
)
3360 /* A catchpoint triggered. */
3361 ecs
->event_thread
->suspend
.stop_signal
= GDB_SIGNAL_TRAP
;
3362 goto process_event_stop_test
;
3365 /* If requested, stop when the dynamic linker notifies
3366 gdb of events. This allows the user to get control
3367 and place breakpoints in initializer routines for
3368 dynamically loaded objects (among other things). */
3369 ecs
->event_thread
->suspend
.stop_signal
= GDB_SIGNAL_0
;
3370 if (stop_on_solib_events
)
3372 /* Make sure we print "Stopped due to solib-event" in
3374 stop_print_frame
= 1;
3376 stop_stepping (ecs
);
3381 /* If we are skipping through a shell, or through shared library
3382 loading that we aren't interested in, resume the program. If
3383 we're running the program normally, also resume. But stop if
3384 we're attaching or setting up a remote connection. */
3385 if (stop_soon
== STOP_QUIETLY
|| stop_soon
== NO_STOP_QUIETLY
)
3387 if (!ptid_equal (ecs
->ptid
, inferior_ptid
))
3388 context_switch (ecs
->ptid
);
3390 /* Loading of shared libraries might have changed breakpoint
3391 addresses. Make sure new breakpoints are inserted. */
3392 if (stop_soon
== NO_STOP_QUIETLY
3393 && !breakpoints_always_inserted_mode ())
3394 insert_breakpoints ();
3395 resume (0, GDB_SIGNAL_0
);
3396 prepare_to_wait (ecs
);
3402 case TARGET_WAITKIND_SPURIOUS
:
3404 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_SPURIOUS\n");
3405 if (!ptid_equal (ecs
->ptid
, inferior_ptid
))
3406 context_switch (ecs
->ptid
);
3407 resume (0, GDB_SIGNAL_0
);
3408 prepare_to_wait (ecs
);
3411 case TARGET_WAITKIND_EXITED
:
3412 case TARGET_WAITKIND_SIGNALLED
:
3415 if (ecs
->ws
.kind
== TARGET_WAITKIND_EXITED
)
3416 fprintf_unfiltered (gdb_stdlog
,
3417 "infrun: TARGET_WAITKIND_EXITED\n");
3419 fprintf_unfiltered (gdb_stdlog
,
3420 "infrun: TARGET_WAITKIND_SIGNALLED\n");
3423 inferior_ptid
= ecs
->ptid
;
3424 set_current_inferior (find_inferior_pid (ptid_get_pid (ecs
->ptid
)));
3425 set_current_program_space (current_inferior ()->pspace
);
3426 handle_vfork_child_exec_or_exit (0);
3427 target_terminal_ours (); /* Must do this before mourn anyway. */
3429 /* Clearing any previous state of convenience variables. */
3430 clear_exit_convenience_vars ();
3432 if (ecs
->ws
.kind
== TARGET_WAITKIND_EXITED
)
3434 /* Record the exit code in the convenience variable $_exitcode, so
3435 that the user can inspect this again later. */
3436 set_internalvar_integer (lookup_internalvar ("_exitcode"),
3437 (LONGEST
) ecs
->ws
.value
.integer
);
3439 /* Also record this in the inferior itself. */
3440 current_inferior ()->has_exit_code
= 1;
3441 current_inferior ()->exit_code
= (LONGEST
) ecs
->ws
.value
.integer
;
3443 print_exited_reason (ecs
->ws
.value
.integer
);
3447 struct regcache
*regcache
= get_thread_regcache (ecs
->ptid
);
3448 struct gdbarch
*gdbarch
= get_regcache_arch (regcache
);
3450 if (gdbarch_gdb_signal_to_target_p (gdbarch
))
3452 /* Set the value of the internal variable $_exitsignal,
3453 which holds the signal uncaught by the inferior. */
3454 set_internalvar_integer (lookup_internalvar ("_exitsignal"),
3455 gdbarch_gdb_signal_to_target (gdbarch
,
3456 ecs
->ws
.value
.sig
));
3460 /* We don't have access to the target's method used for
3461 converting between signal numbers (GDB's internal
3462 representation <-> target's representation).
3463 Therefore, we cannot do a good job at displaying this
3464 information to the user. It's better to just warn
3465 her about it (if infrun debugging is enabled), and
3468 fprintf_filtered (gdb_stdlog
, _("\
3469 Cannot fill $_exitsignal with the correct signal number.\n"));
3472 print_signal_exited_reason (ecs
->ws
.value
.sig
);
3475 gdb_flush (gdb_stdout
);
3476 target_mourn_inferior ();
3477 singlestep_breakpoints_inserted_p
= 0;
3478 cancel_single_step_breakpoints ();
3479 stop_print_frame
= 0;
3480 stop_stepping (ecs
);
3483 /* The following are the only cases in which we keep going;
3484 the above cases end in a continue or goto. */
3485 case TARGET_WAITKIND_FORKED
:
3486 case TARGET_WAITKIND_VFORKED
:
3489 if (ecs
->ws
.kind
== TARGET_WAITKIND_FORKED
)
3490 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_FORKED\n");
3492 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_VFORKED\n");
3495 /* Check whether the inferior is displaced stepping. */
3497 struct regcache
*regcache
= get_thread_regcache (ecs
->ptid
);
3498 struct gdbarch
*gdbarch
= get_regcache_arch (regcache
);
3499 struct displaced_step_inferior_state
*displaced
3500 = get_displaced_stepping_state (ptid_get_pid (ecs
->ptid
));
3502 /* If checking displaced stepping is supported, and thread
3503 ecs->ptid is displaced stepping. */
3504 if (displaced
&& ptid_equal (displaced
->step_ptid
, ecs
->ptid
))
3506 struct inferior
*parent_inf
3507 = find_inferior_pid (ptid_get_pid (ecs
->ptid
));
3508 struct regcache
*child_regcache
;
3509 CORE_ADDR parent_pc
;
3511 /* GDB has got TARGET_WAITKIND_FORKED or TARGET_WAITKIND_VFORKED,
3512 indicating that the displaced stepping of syscall instruction
3513 has been done. Perform cleanup for parent process here. Note
3514 that this operation also cleans up the child process for vfork,
3515 because their pages are shared. */
3516 displaced_step_fixup (ecs
->ptid
, GDB_SIGNAL_TRAP
);
3518 if (ecs
->ws
.kind
== TARGET_WAITKIND_FORKED
)
3520 /* Restore scratch pad for child process. */
3521 displaced_step_restore (displaced
, ecs
->ws
.value
.related_pid
);
3524 /* Since the vfork/fork syscall instruction was executed in the scratchpad,
3525 the child's PC is also within the scratchpad. Set the child's PC
3526 to the parent's PC value, which has already been fixed up.
3527 FIXME: we use the parent's aspace here, although we're touching
3528 the child, because the child hasn't been added to the inferior
3529 list yet at this point. */
3532 = get_thread_arch_aspace_regcache (ecs
->ws
.value
.related_pid
,
3534 parent_inf
->aspace
);
3535 /* Read PC value of parent process. */
3536 parent_pc
= regcache_read_pc (regcache
);
3538 if (debug_displaced
)
3539 fprintf_unfiltered (gdb_stdlog
,
3540 "displaced: write child pc from %s to %s\n",
3542 regcache_read_pc (child_regcache
)),
3543 paddress (gdbarch
, parent_pc
));
3545 regcache_write_pc (child_regcache
, parent_pc
);
3549 if (!ptid_equal (ecs
->ptid
, inferior_ptid
))
3550 context_switch (ecs
->ptid
);
3552 /* Immediately detach breakpoints from the child before there's
3553 any chance of letting the user delete breakpoints from the
3554 breakpoint lists. If we don't do this early, it's easy to
3555 leave left over traps in the child, vis: "break foo; catch
3556 fork; c; <fork>; del; c; <child calls foo>". We only follow
3557 the fork on the last `continue', and by that time the
3558 breakpoint at "foo" is long gone from the breakpoint table.
3559 If we vforked, then we don't need to unpatch here, since both
3560 parent and child are sharing the same memory pages; we'll
3561 need to unpatch at follow/detach time instead to be certain
3562 that new breakpoints added between catchpoint hit time and
3563 vfork follow are detached. */
3564 if (ecs
->ws
.kind
!= TARGET_WAITKIND_VFORKED
)
3566 /* This won't actually modify the breakpoint list, but will
3567 physically remove the breakpoints from the child. */
3568 detach_breakpoints (ecs
->ws
.value
.related_pid
);
3571 if (singlestep_breakpoints_inserted_p
)
3573 /* Pull the single step breakpoints out of the target. */
3574 remove_single_step_breakpoints ();
3575 singlestep_breakpoints_inserted_p
= 0;
3578 /* In case the event is caught by a catchpoint, remember that
3579 the event is to be followed at the next resume of the thread,
3580 and not immediately. */
3581 ecs
->event_thread
->pending_follow
= ecs
->ws
;
3583 stop_pc
= regcache_read_pc (get_thread_regcache (ecs
->ptid
));
3585 ecs
->event_thread
->control
.stop_bpstat
3586 = bpstat_stop_status (get_regcache_aspace (get_current_regcache ()),
3587 stop_pc
, ecs
->ptid
, &ecs
->ws
);
3589 /* Note that we're interested in knowing the bpstat actually
3590 causes a stop, not just if it may explain the signal.
3591 Software watchpoints, for example, always appear in the
3594 = !bpstat_causes_stop (ecs
->event_thread
->control
.stop_bpstat
);
3596 /* If no catchpoint triggered for this, then keep going. */
3597 if (ecs
->random_signal
)
3603 = (follow_fork_mode_string
== follow_fork_mode_child
);
3605 ecs
->event_thread
->suspend
.stop_signal
= GDB_SIGNAL_0
;
3607 should_resume
= follow_fork ();
3610 child
= ecs
->ws
.value
.related_pid
;
3612 /* In non-stop mode, also resume the other branch. */
3613 if (non_stop
&& !detach_fork
)
3616 switch_to_thread (parent
);
3618 switch_to_thread (child
);
3620 ecs
->event_thread
= inferior_thread ();
3621 ecs
->ptid
= inferior_ptid
;
3626 switch_to_thread (child
);
3628 switch_to_thread (parent
);
3630 ecs
->event_thread
= inferior_thread ();
3631 ecs
->ptid
= inferior_ptid
;
3636 stop_stepping (ecs
);
3639 ecs
->event_thread
->suspend
.stop_signal
= GDB_SIGNAL_TRAP
;
3640 goto process_event_stop_test
;
3642 case TARGET_WAITKIND_VFORK_DONE
:
3643 /* Done with the shared memory region. Re-insert breakpoints in
3644 the parent, and keep going. */
3647 fprintf_unfiltered (gdb_stdlog
,
3648 "infrun: TARGET_WAITKIND_VFORK_DONE\n");
3650 if (!ptid_equal (ecs
->ptid
, inferior_ptid
))
3651 context_switch (ecs
->ptid
);
3653 current_inferior ()->waiting_for_vfork_done
= 0;
3654 current_inferior ()->pspace
->breakpoints_not_allowed
= 0;
3655 /* This also takes care of reinserting breakpoints in the
3656 previously locked inferior. */
3660 case TARGET_WAITKIND_EXECD
:
3662 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_EXECD\n");
3664 if (!ptid_equal (ecs
->ptid
, inferior_ptid
))
3665 context_switch (ecs
->ptid
);
3667 singlestep_breakpoints_inserted_p
= 0;
3668 cancel_single_step_breakpoints ();
3670 stop_pc
= regcache_read_pc (get_thread_regcache (ecs
->ptid
));
3672 /* Do whatever is necessary to the parent branch of the vfork. */
3673 handle_vfork_child_exec_or_exit (1);
3675 /* This causes the eventpoints and symbol table to be reset.
3676 Must do this now, before trying to determine whether to
3678 follow_exec (inferior_ptid
, ecs
->ws
.value
.execd_pathname
);
3680 ecs
->event_thread
->control
.stop_bpstat
3681 = bpstat_stop_status (get_regcache_aspace (get_current_regcache ()),
3682 stop_pc
, ecs
->ptid
, &ecs
->ws
);
3684 = (bpstat_explains_signal (ecs
->event_thread
->control
.stop_bpstat
,
3686 == BPSTAT_SIGNAL_NO
);
3688 /* Note that this may be referenced from inside
3689 bpstat_stop_status above, through inferior_has_execd. */
3690 xfree (ecs
->ws
.value
.execd_pathname
);
3691 ecs
->ws
.value
.execd_pathname
= NULL
;
3693 /* If no catchpoint triggered for this, then keep going. */
3694 if (ecs
->random_signal
)
3696 ecs
->event_thread
->suspend
.stop_signal
= GDB_SIGNAL_0
;
3700 ecs
->event_thread
->suspend
.stop_signal
= GDB_SIGNAL_TRAP
;
3701 goto process_event_stop_test
;
3703 /* Be careful not to try to gather much state about a thread
3704 that's in a syscall. It's frequently a losing proposition. */
3705 case TARGET_WAITKIND_SYSCALL_ENTRY
:
3707 fprintf_unfiltered (gdb_stdlog
,
3708 "infrun: TARGET_WAITKIND_SYSCALL_ENTRY\n");
3709 /* Getting the current syscall number. */
3710 if (handle_syscall_event (ecs
) != 0)
3712 goto process_event_stop_test
;
3714 /* Before examining the threads further, step this thread to
3715 get it entirely out of the syscall. (We get notice of the
3716 event when the thread is just on the verge of exiting a
3717 syscall. Stepping one instruction seems to get it back
3719 case TARGET_WAITKIND_SYSCALL_RETURN
:
3721 fprintf_unfiltered (gdb_stdlog
,
3722 "infrun: TARGET_WAITKIND_SYSCALL_RETURN\n");
3723 if (handle_syscall_event (ecs
) != 0)
3725 goto process_event_stop_test
;
3727 case TARGET_WAITKIND_STOPPED
:
3729 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_STOPPED\n");
3730 ecs
->event_thread
->suspend
.stop_signal
= ecs
->ws
.value
.sig
;
3733 case TARGET_WAITKIND_NO_HISTORY
:
3735 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_NO_HISTORY\n");
3736 /* Reverse execution: target ran out of history info. */
3738 /* Pull the single step breakpoints out of the target. */
3739 if (singlestep_breakpoints_inserted_p
)
3741 if (!ptid_equal (ecs
->ptid
, inferior_ptid
))
3742 context_switch (ecs
->ptid
);
3743 remove_single_step_breakpoints ();
3744 singlestep_breakpoints_inserted_p
= 0;
3746 stop_pc
= regcache_read_pc (get_thread_regcache (ecs
->ptid
));
3747 print_no_history_reason ();
3748 stop_stepping (ecs
);
3752 if (ecs
->ws
.kind
== TARGET_WAITKIND_STOPPED
)
3754 /* Do we need to clean up the state of a thread that has
3755 completed a displaced single-step? (Doing so usually affects
3756 the PC, so do it here, before we set stop_pc.) */
3757 displaced_step_fixup (ecs
->ptid
,
3758 ecs
->event_thread
->suspend
.stop_signal
);
3760 /* If we either finished a single-step or hit a breakpoint, but
3761 the user wanted this thread to be stopped, pretend we got a
3762 SIG0 (generic unsignaled stop). */
3764 if (ecs
->event_thread
->stop_requested
3765 && ecs
->event_thread
->suspend
.stop_signal
== GDB_SIGNAL_TRAP
)
3766 ecs
->event_thread
->suspend
.stop_signal
= GDB_SIGNAL_0
;
3769 stop_pc
= regcache_read_pc (get_thread_regcache (ecs
->ptid
));
3773 struct regcache
*regcache
= get_thread_regcache (ecs
->ptid
);
3774 struct gdbarch
*gdbarch
= get_regcache_arch (regcache
);
3775 struct cleanup
*old_chain
= save_inferior_ptid ();
3777 inferior_ptid
= ecs
->ptid
;
3779 fprintf_unfiltered (gdb_stdlog
, "infrun: stop_pc = %s\n",
3780 paddress (gdbarch
, stop_pc
));
3781 if (target_stopped_by_watchpoint ())
3785 fprintf_unfiltered (gdb_stdlog
, "infrun: stopped by watchpoint\n");
3787 if (target_stopped_data_address (¤t_target
, &addr
))
3788 fprintf_unfiltered (gdb_stdlog
,
3789 "infrun: stopped data address = %s\n",
3790 paddress (gdbarch
, addr
));
3792 fprintf_unfiltered (gdb_stdlog
,
3793 "infrun: (no data address available)\n");
3796 do_cleanups (old_chain
);
3799 if (stepping_past_singlestep_breakpoint
)
3801 gdb_assert (singlestep_breakpoints_inserted_p
);
3802 gdb_assert (ptid_equal (singlestep_ptid
, ecs
->ptid
));
3803 gdb_assert (!ptid_equal (singlestep_ptid
, saved_singlestep_ptid
));
3805 stepping_past_singlestep_breakpoint
= 0;
3807 /* We've either finished single-stepping past the single-step
3808 breakpoint, or stopped for some other reason. It would be nice if
3809 we could tell, but we can't reliably. */
3810 if (ecs
->event_thread
->suspend
.stop_signal
== GDB_SIGNAL_TRAP
)
3813 fprintf_unfiltered (gdb_stdlog
,
3814 "infrun: stepping_past_"
3815 "singlestep_breakpoint\n");
3816 /* Pull the single step breakpoints out of the target. */
3817 if (!ptid_equal (ecs
->ptid
, inferior_ptid
))
3818 context_switch (ecs
->ptid
);
3819 remove_single_step_breakpoints ();
3820 singlestep_breakpoints_inserted_p
= 0;
3822 ecs
->random_signal
= 0;
3823 ecs
->event_thread
->control
.trap_expected
= 0;
3825 context_switch (saved_singlestep_ptid
);
3826 if (deprecated_context_hook
)
3827 deprecated_context_hook (pid_to_thread_id (saved_singlestep_ptid
));
3829 resume (1, GDB_SIGNAL_0
);
3830 prepare_to_wait (ecs
);
3835 if (!ptid_equal (deferred_step_ptid
, null_ptid
))
3837 /* In non-stop mode, there's never a deferred_step_ptid set. */
3838 gdb_assert (!non_stop
);
3840 /* If we stopped for some other reason than single-stepping, ignore
3841 the fact that we were supposed to switch back. */
3842 if (ecs
->event_thread
->suspend
.stop_signal
== GDB_SIGNAL_TRAP
)
3845 fprintf_unfiltered (gdb_stdlog
,
3846 "infrun: handling deferred step\n");
3848 /* Pull the single step breakpoints out of the target. */
3849 if (singlestep_breakpoints_inserted_p
)
3851 if (!ptid_equal (ecs
->ptid
, inferior_ptid
))
3852 context_switch (ecs
->ptid
);
3853 remove_single_step_breakpoints ();
3854 singlestep_breakpoints_inserted_p
= 0;
3857 ecs
->event_thread
->control
.trap_expected
= 0;
3859 context_switch (deferred_step_ptid
);
3860 deferred_step_ptid
= null_ptid
;
3861 /* Suppress spurious "Switching to ..." message. */
3862 previous_inferior_ptid
= inferior_ptid
;
3864 resume (1, GDB_SIGNAL_0
);
3865 prepare_to_wait (ecs
);
3869 deferred_step_ptid
= null_ptid
;
3872 /* See if a thread hit a thread-specific breakpoint that was meant for
3873 another thread. If so, then step that thread past the breakpoint,
3876 if (ecs
->event_thread
->suspend
.stop_signal
== GDB_SIGNAL_TRAP
)
3878 int thread_hop_needed
= 0;
3879 struct address_space
*aspace
=
3880 get_regcache_aspace (get_thread_regcache (ecs
->ptid
));
3882 /* Check if a regular breakpoint has been hit before checking
3883 for a potential single step breakpoint. Otherwise, GDB will
3884 not see this breakpoint hit when stepping onto breakpoints. */
3885 if (regular_breakpoint_inserted_here_p (aspace
, stop_pc
))
3887 ecs
->random_signal
= 0;
3888 if (!breakpoint_thread_match (aspace
, stop_pc
, ecs
->ptid
))
3889 thread_hop_needed
= 1;
3891 else if (singlestep_breakpoints_inserted_p
)
3893 /* We have not context switched yet, so this should be true
3894 no matter which thread hit the singlestep breakpoint. */
3895 gdb_assert (ptid_equal (inferior_ptid
, singlestep_ptid
));
3897 fprintf_unfiltered (gdb_stdlog
, "infrun: software single step "
3899 target_pid_to_str (ecs
->ptid
));
3901 ecs
->random_signal
= 0;
3902 /* The call to in_thread_list is necessary because PTIDs sometimes
3903 change when we go from single-threaded to multi-threaded. If
3904 the singlestep_ptid is still in the list, assume that it is
3905 really different from ecs->ptid. */
3906 if (!ptid_equal (singlestep_ptid
, ecs
->ptid
)
3907 && in_thread_list (singlestep_ptid
))
3909 /* If the PC of the thread we were trying to single-step
3910 has changed, discard this event (which we were going
3911 to ignore anyway), and pretend we saw that thread
3912 trap. This prevents us continuously moving the
3913 single-step breakpoint forward, one instruction at a
3914 time. If the PC has changed, then the thread we were
3915 trying to single-step has trapped or been signalled,
3916 but the event has not been reported to GDB yet.
3918 There might be some cases where this loses signal
3919 information, if a signal has arrived at exactly the
3920 same time that the PC changed, but this is the best
3921 we can do with the information available. Perhaps we
3922 should arrange to report all events for all threads
3923 when they stop, or to re-poll the remote looking for
3924 this particular thread (i.e. temporarily enable
3927 CORE_ADDR new_singlestep_pc
3928 = regcache_read_pc (get_thread_regcache (singlestep_ptid
));
3930 if (new_singlestep_pc
!= singlestep_pc
)
3932 enum gdb_signal stop_signal
;
3935 fprintf_unfiltered (gdb_stdlog
, "infrun: unexpected thread,"
3936 " but expected thread advanced also\n");
3938 /* The current context still belongs to
3939 singlestep_ptid. Don't swap here, since that's
3940 the context we want to use. Just fudge our
3941 state and continue. */
3942 stop_signal
= ecs
->event_thread
->suspend
.stop_signal
;
3943 ecs
->event_thread
->suspend
.stop_signal
= GDB_SIGNAL_0
;
3944 ecs
->ptid
= singlestep_ptid
;
3945 ecs
->event_thread
= find_thread_ptid (ecs
->ptid
);
3946 ecs
->event_thread
->suspend
.stop_signal
= stop_signal
;
3947 stop_pc
= new_singlestep_pc
;
3952 fprintf_unfiltered (gdb_stdlog
,
3953 "infrun: unexpected thread\n");
3955 thread_hop_needed
= 1;
3956 stepping_past_singlestep_breakpoint
= 1;
3957 saved_singlestep_ptid
= singlestep_ptid
;
3962 if (thread_hop_needed
)
3964 struct regcache
*thread_regcache
;
3965 int remove_status
= 0;
3968 fprintf_unfiltered (gdb_stdlog
, "infrun: thread_hop_needed\n");
3970 /* Switch context before touching inferior memory, the
3971 previous thread may have exited. */
3972 if (!ptid_equal (inferior_ptid
, ecs
->ptid
))
3973 context_switch (ecs
->ptid
);
3975 /* Saw a breakpoint, but it was hit by the wrong thread.
3978 if (singlestep_breakpoints_inserted_p
)
3980 /* Pull the single step breakpoints out of the target. */
3981 remove_single_step_breakpoints ();
3982 singlestep_breakpoints_inserted_p
= 0;
3985 /* If the arch can displace step, don't remove the
3987 thread_regcache
= get_thread_regcache (ecs
->ptid
);
3988 if (!use_displaced_stepping (get_regcache_arch (thread_regcache
)))
3989 remove_status
= remove_breakpoints ();
3991 /* Did we fail to remove breakpoints? If so, try
3992 to set the PC past the bp. (There's at least
3993 one situation in which we can fail to remove
3994 the bp's: On HP-UX's that use ttrace, we can't
3995 change the address space of a vforking child
3996 process until the child exits (well, okay, not
3997 then either :-) or execs. */
3998 if (remove_status
!= 0)
3999 error (_("Cannot step over breakpoint hit in wrong thread"));
4004 /* Only need to require the next event from this
4005 thread in all-stop mode. */
4006 waiton_ptid
= ecs
->ptid
;
4007 infwait_state
= infwait_thread_hop_state
;
4010 ecs
->event_thread
->stepping_over_breakpoint
= 1;
4015 else if (singlestep_breakpoints_inserted_p
)
4017 ecs
->random_signal
= 0;
4021 ecs
->random_signal
= 1;
4023 /* See if something interesting happened to the non-current thread. If
4024 so, then switch to that thread. */
4025 if (!ptid_equal (ecs
->ptid
, inferior_ptid
))
4028 fprintf_unfiltered (gdb_stdlog
, "infrun: context switch\n");
4030 context_switch (ecs
->ptid
);
4032 if (deprecated_context_hook
)
4033 deprecated_context_hook (pid_to_thread_id (ecs
->ptid
));
4036 /* At this point, get hold of the now-current thread's frame. */
4037 frame
= get_current_frame ();
4038 gdbarch
= get_frame_arch (frame
);
4040 if (singlestep_breakpoints_inserted_p
)
4042 /* Pull the single step breakpoints out of the target. */
4043 remove_single_step_breakpoints ();
4044 singlestep_breakpoints_inserted_p
= 0;
4047 if (stepped_after_stopped_by_watchpoint
)
4048 stopped_by_watchpoint
= 0;
4050 stopped_by_watchpoint
= watchpoints_triggered (&ecs
->ws
);
4052 /* If necessary, step over this watchpoint. We'll be back to display
4054 if (stopped_by_watchpoint
4055 && (target_have_steppable_watchpoint
4056 || gdbarch_have_nonsteppable_watchpoint (gdbarch
)))
4058 /* At this point, we are stopped at an instruction which has
4059 attempted to write to a piece of memory under control of
4060 a watchpoint. The instruction hasn't actually executed
4061 yet. If we were to evaluate the watchpoint expression
4062 now, we would get the old value, and therefore no change
4063 would seem to have occurred.
4065 In order to make watchpoints work `right', we really need
4066 to complete the memory write, and then evaluate the
4067 watchpoint expression. We do this by single-stepping the
4070 It may not be necessary to disable the watchpoint to stop over
4071 it. For example, the PA can (with some kernel cooperation)
4072 single step over a watchpoint without disabling the watchpoint.
4074 It is far more common to need to disable a watchpoint to step
4075 the inferior over it. If we have non-steppable watchpoints,
4076 we must disable the current watchpoint; it's simplest to
4077 disable all watchpoints and breakpoints. */
4080 if (!target_have_steppable_watchpoint
)
4082 remove_breakpoints ();
4083 /* See comment in resume why we need to stop bypassing signals
4084 while breakpoints have been removed. */
4085 target_pass_signals (0, NULL
);
4088 hw_step
= maybe_software_singlestep (gdbarch
, stop_pc
);
4089 target_resume (ecs
->ptid
, hw_step
, GDB_SIGNAL_0
);
4090 waiton_ptid
= ecs
->ptid
;
4091 if (target_have_steppable_watchpoint
)
4092 infwait_state
= infwait_step_watch_state
;
4094 infwait_state
= infwait_nonstep_watch_state
;
4095 prepare_to_wait (ecs
);
4099 clear_stop_func (ecs
);
4100 ecs
->event_thread
->stepping_over_breakpoint
= 0;
4101 bpstat_clear (&ecs
->event_thread
->control
.stop_bpstat
);
4102 ecs
->event_thread
->control
.stop_step
= 0;
4103 stop_print_frame
= 1;
4104 ecs
->random_signal
= 0;
4105 stopped_by_random_signal
= 0;
4107 /* Hide inlined functions starting here, unless we just performed stepi or
4108 nexti. After stepi and nexti, always show the innermost frame (not any
4109 inline function call sites). */
4110 if (ecs
->event_thread
->control
.step_range_end
!= 1)
4112 struct address_space
*aspace
=
4113 get_regcache_aspace (get_thread_regcache (ecs
->ptid
));
4115 /* skip_inline_frames is expensive, so we avoid it if we can
4116 determine that the address is one where functions cannot have
4117 been inlined. This improves performance with inferiors that
4118 load a lot of shared libraries, because the solib event
4119 breakpoint is defined as the address of a function (i.e. not
4120 inline). Note that we have to check the previous PC as well
4121 as the current one to catch cases when we have just
4122 single-stepped off a breakpoint prior to reinstating it.
4123 Note that we're assuming that the code we single-step to is
4124 not inline, but that's not definitive: there's nothing
4125 preventing the event breakpoint function from containing
4126 inlined code, and the single-step ending up there. If the
4127 user had set a breakpoint on that inlined code, the missing
4128 skip_inline_frames call would break things. Fortunately
4129 that's an extremely unlikely scenario. */
4130 if (!pc_at_non_inline_function (aspace
, stop_pc
, &ecs
->ws
)
4131 && !(ecs
->event_thread
->suspend
.stop_signal
== GDB_SIGNAL_TRAP
4132 && ecs
->event_thread
->control
.trap_expected
4133 && pc_at_non_inline_function (aspace
,
4134 ecs
->event_thread
->prev_pc
,
4137 skip_inline_frames (ecs
->ptid
);
4139 /* Re-fetch current thread's frame in case that invalidated
4141 frame
= get_current_frame ();
4142 gdbarch
= get_frame_arch (frame
);
4146 if (ecs
->event_thread
->suspend
.stop_signal
== GDB_SIGNAL_TRAP
4147 && ecs
->event_thread
->control
.trap_expected
4148 && gdbarch_single_step_through_delay_p (gdbarch
)
4149 && currently_stepping (ecs
->event_thread
))
4151 /* We're trying to step off a breakpoint. Turns out that we're
4152 also on an instruction that needs to be stepped multiple
4153 times before it's been fully executing. E.g., architectures
4154 with a delay slot. It needs to be stepped twice, once for
4155 the instruction and once for the delay slot. */
4156 int step_through_delay
4157 = gdbarch_single_step_through_delay (gdbarch
, frame
);
4159 if (debug_infrun
&& step_through_delay
)
4160 fprintf_unfiltered (gdb_stdlog
, "infrun: step through delay\n");
4161 if (ecs
->event_thread
->control
.step_range_end
== 0
4162 && step_through_delay
)
4164 /* The user issued a continue when stopped at a breakpoint.
4165 Set up for another trap and get out of here. */
4166 ecs
->event_thread
->stepping_over_breakpoint
= 1;
4170 else if (step_through_delay
)
4172 /* The user issued a step when stopped at a breakpoint.
4173 Maybe we should stop, maybe we should not - the delay
4174 slot *might* correspond to a line of source. In any
4175 case, don't decide that here, just set
4176 ecs->stepping_over_breakpoint, making sure we
4177 single-step again before breakpoints are re-inserted. */
4178 ecs
->event_thread
->stepping_over_breakpoint
= 1;
4182 /* Look at the cause of the stop, and decide what to do.
4183 The alternatives are:
4184 1) stop_stepping and return; to really stop and return to the debugger,
4185 2) keep_going and return to start up again
4186 (set ecs->event_thread->stepping_over_breakpoint to 1 to single step once)
4187 3) set ecs->random_signal to 1, and the decision between 1 and 2
4188 will be made according to the signal handling tables. */
4190 if (ecs
->event_thread
->suspend
.stop_signal
== GDB_SIGNAL_TRAP
4194 fprintf_unfiltered (gdb_stdlog
, "infrun: stopped\n");
4195 stop_print_frame
= 0;
4196 stop_stepping (ecs
);
4200 /* This is originated from start_remote(), start_inferior() and
4201 shared libraries hook functions. */
4202 if (stop_soon
== STOP_QUIETLY
|| stop_soon
== STOP_QUIETLY_REMOTE
)
4205 fprintf_unfiltered (gdb_stdlog
, "infrun: quietly stopped\n");
4206 stop_stepping (ecs
);
4210 /* This originates from attach_command(). We need to overwrite
4211 the stop_signal here, because some kernels don't ignore a
4212 SIGSTOP in a subsequent ptrace(PTRACE_CONT,SIGSTOP) call.
4213 See more comments in inferior.h. On the other hand, if we
4214 get a non-SIGSTOP, report it to the user - assume the backend
4215 will handle the SIGSTOP if it should show up later.
4217 Also consider that the attach is complete when we see a
4218 SIGTRAP. Some systems (e.g. Windows), and stubs supporting
4219 target extended-remote report it instead of a SIGSTOP
4220 (e.g. gdbserver). We already rely on SIGTRAP being our
4221 signal, so this is no exception.
4223 Also consider that the attach is complete when we see a
4224 GDB_SIGNAL_0. In non-stop mode, GDB will explicitly tell
4225 the target to stop all threads of the inferior, in case the
4226 low level attach operation doesn't stop them implicitly. If
4227 they weren't stopped implicitly, then the stub will report a
4228 GDB_SIGNAL_0, meaning: stopped for no particular reason
4229 other than GDB's request. */
4230 if (stop_soon
== STOP_QUIETLY_NO_SIGSTOP
4231 && (ecs
->event_thread
->suspend
.stop_signal
== GDB_SIGNAL_STOP
4232 || ecs
->event_thread
->suspend
.stop_signal
== GDB_SIGNAL_TRAP
4233 || ecs
->event_thread
->suspend
.stop_signal
== GDB_SIGNAL_0
))
4235 stop_stepping (ecs
);
4236 ecs
->event_thread
->suspend
.stop_signal
= GDB_SIGNAL_0
;
4240 /* See if there is a breakpoint/watchpoint/catchpoint/etc. that
4241 handles this event. */
4242 ecs
->event_thread
->control
.stop_bpstat
4243 = bpstat_stop_status (get_regcache_aspace (get_current_regcache ()),
4244 stop_pc
, ecs
->ptid
, &ecs
->ws
);
4246 /* Following in case break condition called a
4248 stop_print_frame
= 1;
4250 /* This is where we handle "moribund" watchpoints. Unlike
4251 software breakpoints traps, hardware watchpoint traps are
4252 always distinguishable from random traps. If no high-level
4253 watchpoint is associated with the reported stop data address
4254 anymore, then the bpstat does not explain the signal ---
4255 simply make sure to ignore it if `stopped_by_watchpoint' is
4259 && ecs
->event_thread
->suspend
.stop_signal
== GDB_SIGNAL_TRAP
4260 && (bpstat_explains_signal (ecs
->event_thread
->control
.stop_bpstat
,
4262 == BPSTAT_SIGNAL_NO
)
4263 && stopped_by_watchpoint
)
4264 fprintf_unfiltered (gdb_stdlog
,
4265 "infrun: no user watchpoint explains "
4266 "watchpoint SIGTRAP, ignoring\n");
4268 /* NOTE: cagney/2003-03-29: These two checks for a random signal
4269 at one stage in the past included checks for an inferior
4270 function call's call dummy's return breakpoint. The original
4271 comment, that went with the test, read:
4273 ``End of a stack dummy. Some systems (e.g. Sony news) give
4274 another signal besides SIGTRAP, so check here as well as
4277 If someone ever tries to get call dummys on a
4278 non-executable stack to work (where the target would stop
4279 with something like a SIGSEGV), then those tests might need
4280 to be re-instated. Given, however, that the tests were only
4281 enabled when momentary breakpoints were not being used, I
4282 suspect that it won't be the case.
4284 NOTE: kettenis/2004-02-05: Indeed such checks don't seem to
4285 be necessary for call dummies on a non-executable stack on
4288 if (ecs
->event_thread
->suspend
.stop_signal
== GDB_SIGNAL_TRAP
)
4290 = !((bpstat_explains_signal (ecs
->event_thread
->control
.stop_bpstat
,
4292 != BPSTAT_SIGNAL_NO
)
4293 || stopped_by_watchpoint
4294 || ecs
->event_thread
->control
.trap_expected
4295 || (ecs
->event_thread
->control
.step_range_end
4296 && (ecs
->event_thread
->control
.step_resume_breakpoint
4300 enum bpstat_signal_value sval
;
4302 sval
= bpstat_explains_signal (ecs
->event_thread
->control
.stop_bpstat
,
4303 ecs
->event_thread
->suspend
.stop_signal
);
4304 ecs
->random_signal
= (sval
== BPSTAT_SIGNAL_NO
);
4306 if (sval
== BPSTAT_SIGNAL_HIDE
)
4307 ecs
->event_thread
->suspend
.stop_signal
= GDB_SIGNAL_TRAP
;
4310 process_event_stop_test
:
4312 /* Re-fetch current thread's frame in case we did a
4313 "goto process_event_stop_test" above. */
4314 frame
= get_current_frame ();
4315 gdbarch
= get_frame_arch (frame
);
4317 /* For the program's own signals, act according to
4318 the signal handling tables. */
4320 if (ecs
->random_signal
)
4322 /* Signal not for debugging purposes. */
4324 struct inferior
*inf
= find_inferior_pid (ptid_get_pid (ecs
->ptid
));
4327 fprintf_unfiltered (gdb_stdlog
, "infrun: random signal %d\n",
4328 ecs
->event_thread
->suspend
.stop_signal
);
4330 stopped_by_random_signal
= 1;
4332 if (signal_print
[ecs
->event_thread
->suspend
.stop_signal
])
4335 target_terminal_ours_for_output ();
4336 print_signal_received_reason
4337 (ecs
->event_thread
->suspend
.stop_signal
);
4339 /* Always stop on signals if we're either just gaining control
4340 of the program, or the user explicitly requested this thread
4341 to remain stopped. */
4342 if (stop_soon
!= NO_STOP_QUIETLY
4343 || ecs
->event_thread
->stop_requested
4345 && signal_stop_state (ecs
->event_thread
->suspend
.stop_signal
)))
4347 stop_stepping (ecs
);
4350 /* If not going to stop, give terminal back
4351 if we took it away. */
4353 target_terminal_inferior ();
4355 /* Clear the signal if it should not be passed. */
4356 if (signal_program
[ecs
->event_thread
->suspend
.stop_signal
] == 0)
4357 ecs
->event_thread
->suspend
.stop_signal
= GDB_SIGNAL_0
;
4359 if (ecs
->event_thread
->prev_pc
== stop_pc
4360 && ecs
->event_thread
->control
.trap_expected
4361 && ecs
->event_thread
->control
.step_resume_breakpoint
== NULL
)
4363 /* We were just starting a new sequence, attempting to
4364 single-step off of a breakpoint and expecting a SIGTRAP.
4365 Instead this signal arrives. This signal will take us out
4366 of the stepping range so GDB needs to remember to, when
4367 the signal handler returns, resume stepping off that
4369 /* To simplify things, "continue" is forced to use the same
4370 code paths as single-step - set a breakpoint at the
4371 signal return address and then, once hit, step off that
4374 fprintf_unfiltered (gdb_stdlog
,
4375 "infrun: signal arrived while stepping over "
4378 insert_hp_step_resume_breakpoint_at_frame (frame
);
4379 ecs
->event_thread
->step_after_step_resume_breakpoint
= 1;
4380 /* Reset trap_expected to ensure breakpoints are re-inserted. */
4381 ecs
->event_thread
->control
.trap_expected
= 0;
4386 if (ecs
->event_thread
->control
.step_range_end
!= 0
4387 && ecs
->event_thread
->suspend
.stop_signal
!= GDB_SIGNAL_0
4388 && pc_in_thread_step_range (stop_pc
, ecs
->event_thread
)
4389 && frame_id_eq (get_stack_frame_id (frame
),
4390 ecs
->event_thread
->control
.step_stack_frame_id
)
4391 && ecs
->event_thread
->control
.step_resume_breakpoint
== NULL
)
4393 /* The inferior is about to take a signal that will take it
4394 out of the single step range. Set a breakpoint at the
4395 current PC (which is presumably where the signal handler
4396 will eventually return) and then allow the inferior to
4399 Note that this is only needed for a signal delivered
4400 while in the single-step range. Nested signals aren't a
4401 problem as they eventually all return. */
4403 fprintf_unfiltered (gdb_stdlog
,
4404 "infrun: signal may take us out of "
4405 "single-step range\n");
4407 insert_hp_step_resume_breakpoint_at_frame (frame
);
4408 /* Reset trap_expected to ensure breakpoints are re-inserted. */
4409 ecs
->event_thread
->control
.trap_expected
= 0;
4414 /* Note: step_resume_breakpoint may be non-NULL. This occures
4415 when either there's a nested signal, or when there's a
4416 pending signal enabled just as the signal handler returns
4417 (leaving the inferior at the step-resume-breakpoint without
4418 actually executing it). Either way continue until the
4419 breakpoint is really hit. */
4423 /* Handle cases caused by hitting a breakpoint. */
4425 CORE_ADDR jmp_buf_pc
;
4426 struct bpstat_what what
;
4428 what
= bpstat_what (ecs
->event_thread
->control
.stop_bpstat
);
4430 if (what
.call_dummy
)
4432 stop_stack_dummy
= what
.call_dummy
;
4435 /* If we hit an internal event that triggers symbol changes, the
4436 current frame will be invalidated within bpstat_what (e.g.,
4437 if we hit an internal solib event). Re-fetch it. */
4438 frame
= get_current_frame ();
4439 gdbarch
= get_frame_arch (frame
);
4441 switch (what
.main_action
)
4443 case BPSTAT_WHAT_SET_LONGJMP_RESUME
:
4444 /* If we hit the breakpoint at longjmp while stepping, we
4445 install a momentary breakpoint at the target of the
4449 fprintf_unfiltered (gdb_stdlog
,
4450 "infrun: BPSTAT_WHAT_SET_LONGJMP_RESUME\n");
4452 ecs
->event_thread
->stepping_over_breakpoint
= 1;
4454 if (what
.is_longjmp
)
4456 struct value
*arg_value
;
4458 /* If we set the longjmp breakpoint via a SystemTap
4459 probe, then use it to extract the arguments. The
4460 destination PC is the third argument to the
4462 arg_value
= probe_safe_evaluate_at_pc (frame
, 2);
4464 jmp_buf_pc
= value_as_address (arg_value
);
4465 else if (!gdbarch_get_longjmp_target_p (gdbarch
)
4466 || !gdbarch_get_longjmp_target (gdbarch
,
4467 frame
, &jmp_buf_pc
))
4470 fprintf_unfiltered (gdb_stdlog
,
4471 "infrun: BPSTAT_WHAT_SET_LONGJMP_RESUME "
4472 "(!gdbarch_get_longjmp_target)\n");
4477 /* Insert a breakpoint at resume address. */
4478 insert_longjmp_resume_breakpoint (gdbarch
, jmp_buf_pc
);
4481 check_exception_resume (ecs
, frame
);
4485 case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME
:
4487 struct frame_info
*init_frame
;
4489 /* There are several cases to consider.
4491 1. The initiating frame no longer exists. In this case
4492 we must stop, because the exception or longjmp has gone
4495 2. The initiating frame exists, and is the same as the
4496 current frame. We stop, because the exception or
4497 longjmp has been caught.
4499 3. The initiating frame exists and is different from
4500 the current frame. This means the exception or longjmp
4501 has been caught beneath the initiating frame, so keep
4504 4. longjmp breakpoint has been placed just to protect
4505 against stale dummy frames and user is not interested
4506 in stopping around longjmps. */
4509 fprintf_unfiltered (gdb_stdlog
,
4510 "infrun: BPSTAT_WHAT_CLEAR_LONGJMP_RESUME\n");
4512 gdb_assert (ecs
->event_thread
->control
.exception_resume_breakpoint
4514 delete_exception_resume_breakpoint (ecs
->event_thread
);
4516 if (what
.is_longjmp
)
4518 check_longjmp_breakpoint_for_call_dummy (ecs
->event_thread
->num
);
4520 if (!frame_id_p (ecs
->event_thread
->initiating_frame
))
4528 init_frame
= frame_find_by_id (ecs
->event_thread
->initiating_frame
);
4532 struct frame_id current_id
4533 = get_frame_id (get_current_frame ());
4534 if (frame_id_eq (current_id
,
4535 ecs
->event_thread
->initiating_frame
))
4537 /* Case 2. Fall through. */
4547 /* For Cases 1 and 2, remove the step-resume breakpoint,
4549 delete_step_resume_breakpoint (ecs
->event_thread
);
4551 ecs
->event_thread
->control
.stop_step
= 1;
4552 print_end_stepping_range_reason ();
4553 stop_stepping (ecs
);
4557 case BPSTAT_WHAT_SINGLE
:
4559 fprintf_unfiltered (gdb_stdlog
, "infrun: BPSTAT_WHAT_SINGLE\n");
4560 ecs
->event_thread
->stepping_over_breakpoint
= 1;
4561 /* Still need to check other stuff, at least the case where
4562 we are stepping and step out of the right range. */
4565 case BPSTAT_WHAT_STEP_RESUME
:
4567 fprintf_unfiltered (gdb_stdlog
, "infrun: BPSTAT_WHAT_STEP_RESUME\n");
4569 delete_step_resume_breakpoint (ecs
->event_thread
);
4570 if (ecs
->event_thread
->control
.proceed_to_finish
4571 && execution_direction
== EXEC_REVERSE
)
4573 struct thread_info
*tp
= ecs
->event_thread
;
4575 /* We are finishing a function in reverse, and just hit
4576 the step-resume breakpoint at the start address of
4577 the function, and we're almost there -- just need to
4578 back up by one more single-step, which should take us
4579 back to the function call. */
4580 tp
->control
.step_range_start
= tp
->control
.step_range_end
= 1;
4584 fill_in_stop_func (gdbarch
, ecs
);
4585 if (stop_pc
== ecs
->stop_func_start
4586 && execution_direction
== EXEC_REVERSE
)
4588 /* We are stepping over a function call in reverse, and
4589 just hit the step-resume breakpoint at the start
4590 address of the function. Go back to single-stepping,
4591 which should take us back to the function call. */
4592 ecs
->event_thread
->stepping_over_breakpoint
= 1;
4598 case BPSTAT_WHAT_STOP_NOISY
:
4600 fprintf_unfiltered (gdb_stdlog
, "infrun: BPSTAT_WHAT_STOP_NOISY\n");
4601 stop_print_frame
= 1;
4603 /* We are about to nuke the step_resume_breakpointt via the
4604 cleanup chain, so no need to worry about it here. */
4606 stop_stepping (ecs
);
4609 case BPSTAT_WHAT_STOP_SILENT
:
4611 fprintf_unfiltered (gdb_stdlog
, "infrun: BPSTAT_WHAT_STOP_SILENT\n");
4612 stop_print_frame
= 0;
4614 /* We are about to nuke the step_resume_breakpoin via the
4615 cleanup chain, so no need to worry about it here. */
4617 stop_stepping (ecs
);
4620 case BPSTAT_WHAT_HP_STEP_RESUME
:
4622 fprintf_unfiltered (gdb_stdlog
, "infrun: BPSTAT_WHAT_HP_STEP_RESUME\n");
4624 delete_step_resume_breakpoint (ecs
->event_thread
);
4625 if (ecs
->event_thread
->step_after_step_resume_breakpoint
)
4627 /* Back when the step-resume breakpoint was inserted, we
4628 were trying to single-step off a breakpoint. Go back
4630 ecs
->event_thread
->step_after_step_resume_breakpoint
= 0;
4631 ecs
->event_thread
->stepping_over_breakpoint
= 1;
4637 case BPSTAT_WHAT_KEEP_CHECKING
:
4642 /* We come here if we hit a breakpoint but should not
4643 stop for it. Possibly we also were stepping
4644 and should stop for that. So fall through and
4645 test for stepping. But, if not stepping,
4648 /* In all-stop mode, if we're currently stepping but have stopped in
4649 some other thread, we need to switch back to the stepped thread. */
4652 struct thread_info
*tp
;
4654 tp
= iterate_over_threads (currently_stepping_or_nexting_callback
,
4658 /* However, if the current thread is blocked on some internal
4659 breakpoint, and we simply need to step over that breakpoint
4660 to get it going again, do that first. */
4661 if ((ecs
->event_thread
->control
.trap_expected
4662 && ecs
->event_thread
->suspend
.stop_signal
!= GDB_SIGNAL_TRAP
)
4663 || ecs
->event_thread
->stepping_over_breakpoint
)
4669 /* If the stepping thread exited, then don't try to switch
4670 back and resume it, which could fail in several different
4671 ways depending on the target. Instead, just keep going.
4673 We can find a stepping dead thread in the thread list in
4676 - The target supports thread exit events, and when the
4677 target tries to delete the thread from the thread list,
4678 inferior_ptid pointed at the exiting thread. In such
4679 case, calling delete_thread does not really remove the
4680 thread from the list; instead, the thread is left listed,
4681 with 'exited' state.
4683 - The target's debug interface does not support thread
4684 exit events, and so we have no idea whatsoever if the
4685 previously stepping thread is still alive. For that
4686 reason, we need to synchronously query the target
4688 if (is_exited (tp
->ptid
)
4689 || !target_thread_alive (tp
->ptid
))
4692 fprintf_unfiltered (gdb_stdlog
,
4693 "infrun: not switching back to "
4694 "stepped thread, it has vanished\n");
4696 delete_thread (tp
->ptid
);
4701 /* Otherwise, we no longer expect a trap in the current thread.
4702 Clear the trap_expected flag before switching back -- this is
4703 what keep_going would do as well, if we called it. */
4704 ecs
->event_thread
->control
.trap_expected
= 0;
4707 fprintf_unfiltered (gdb_stdlog
,
4708 "infrun: switching back to stepped thread\n");
4710 ecs
->event_thread
= tp
;
4711 ecs
->ptid
= tp
->ptid
;
4712 context_switch (ecs
->ptid
);
4718 if (ecs
->random_signal
)
4721 fprintf_unfiltered (gdb_stdlog
,
4722 "infrun: random signal, keep going\n");
4724 /* Signal not stepping related. */
4729 if (ecs
->event_thread
->control
.step_resume_breakpoint
)
4732 fprintf_unfiltered (gdb_stdlog
,
4733 "infrun: step-resume breakpoint is inserted\n");
4735 /* Having a step-resume breakpoint overrides anything
4736 else having to do with stepping commands until
4737 that breakpoint is reached. */
4742 if (ecs
->event_thread
->control
.step_range_end
== 0)
4745 fprintf_unfiltered (gdb_stdlog
, "infrun: no stepping, continue\n");
4746 /* Likewise if we aren't even stepping. */
4751 /* Re-fetch current thread's frame in case the code above caused
4752 the frame cache to be re-initialized, making our FRAME variable
4753 a dangling pointer. */
4754 frame
= get_current_frame ();
4755 gdbarch
= get_frame_arch (frame
);
4756 fill_in_stop_func (gdbarch
, ecs
);
4758 /* If stepping through a line, keep going if still within it.
4760 Note that step_range_end is the address of the first instruction
4761 beyond the step range, and NOT the address of the last instruction
4764 Note also that during reverse execution, we may be stepping
4765 through a function epilogue and therefore must detect when
4766 the current-frame changes in the middle of a line. */
4768 if (pc_in_thread_step_range (stop_pc
, ecs
->event_thread
)
4769 && (execution_direction
!= EXEC_REVERSE
4770 || frame_id_eq (get_frame_id (frame
),
4771 ecs
->event_thread
->control
.step_frame_id
)))
4775 (gdb_stdlog
, "infrun: stepping inside range [%s-%s]\n",
4776 paddress (gdbarch
, ecs
->event_thread
->control
.step_range_start
),
4777 paddress (gdbarch
, ecs
->event_thread
->control
.step_range_end
));
4779 /* Tentatively re-enable range stepping; `resume' disables it if
4780 necessary (e.g., if we're stepping over a breakpoint or we
4781 have software watchpoints). */
4782 ecs
->event_thread
->control
.may_range_step
= 1;
4784 /* When stepping backward, stop at beginning of line range
4785 (unless it's the function entry point, in which case
4786 keep going back to the call point). */
4787 if (stop_pc
== ecs
->event_thread
->control
.step_range_start
4788 && stop_pc
!= ecs
->stop_func_start
4789 && execution_direction
== EXEC_REVERSE
)
4791 ecs
->event_thread
->control
.stop_step
= 1;
4792 print_end_stepping_range_reason ();
4793 stop_stepping (ecs
);
4801 /* We stepped out of the stepping range. */
4803 /* If we are stepping at the source level and entered the runtime
4804 loader dynamic symbol resolution code...
4806 EXEC_FORWARD: we keep on single stepping until we exit the run
4807 time loader code and reach the callee's address.
4809 EXEC_REVERSE: we've already executed the callee (backward), and
4810 the runtime loader code is handled just like any other
4811 undebuggable function call. Now we need only keep stepping
4812 backward through the trampoline code, and that's handled further
4813 down, so there is nothing for us to do here. */
4815 if (execution_direction
!= EXEC_REVERSE
4816 && ecs
->event_thread
->control
.step_over_calls
== STEP_OVER_UNDEBUGGABLE
4817 && in_solib_dynsym_resolve_code (stop_pc
))
4819 CORE_ADDR pc_after_resolver
=
4820 gdbarch_skip_solib_resolver (gdbarch
, stop_pc
);
4823 fprintf_unfiltered (gdb_stdlog
,
4824 "infrun: stepped into dynsym resolve code\n");
4826 if (pc_after_resolver
)
4828 /* Set up a step-resume breakpoint at the address
4829 indicated by SKIP_SOLIB_RESOLVER. */
4830 struct symtab_and_line sr_sal
;
4833 sr_sal
.pc
= pc_after_resolver
;
4834 sr_sal
.pspace
= get_frame_program_space (frame
);
4836 insert_step_resume_breakpoint_at_sal (gdbarch
,
4837 sr_sal
, null_frame_id
);
4844 if (ecs
->event_thread
->control
.step_range_end
!= 1
4845 && (ecs
->event_thread
->control
.step_over_calls
== STEP_OVER_UNDEBUGGABLE
4846 || ecs
->event_thread
->control
.step_over_calls
== STEP_OVER_ALL
)
4847 && get_frame_type (frame
) == SIGTRAMP_FRAME
)
4850 fprintf_unfiltered (gdb_stdlog
,
4851 "infrun: stepped into signal trampoline\n");
4852 /* The inferior, while doing a "step" or "next", has ended up in
4853 a signal trampoline (either by a signal being delivered or by
4854 the signal handler returning). Just single-step until the
4855 inferior leaves the trampoline (either by calling the handler
4861 /* If we're in the return path from a shared library trampoline,
4862 we want to proceed through the trampoline when stepping. */
4863 /* macro/2012-04-25: This needs to come before the subroutine
4864 call check below as on some targets return trampolines look
4865 like subroutine calls (MIPS16 return thunks). */
4866 if (gdbarch_in_solib_return_trampoline (gdbarch
,
4867 stop_pc
, ecs
->stop_func_name
)
4868 && ecs
->event_thread
->control
.step_over_calls
!= STEP_OVER_NONE
)
4870 /* Determine where this trampoline returns. */
4871 CORE_ADDR real_stop_pc
;
4873 real_stop_pc
= gdbarch_skip_trampoline_code (gdbarch
, frame
, stop_pc
);
4876 fprintf_unfiltered (gdb_stdlog
,
4877 "infrun: stepped into solib return tramp\n");
4879 /* Only proceed through if we know where it's going. */
4882 /* And put the step-breakpoint there and go until there. */
4883 struct symtab_and_line sr_sal
;
4885 init_sal (&sr_sal
); /* initialize to zeroes */
4886 sr_sal
.pc
= real_stop_pc
;
4887 sr_sal
.section
= find_pc_overlay (sr_sal
.pc
);
4888 sr_sal
.pspace
= get_frame_program_space (frame
);
4890 /* Do not specify what the fp should be when we stop since
4891 on some machines the prologue is where the new fp value
4893 insert_step_resume_breakpoint_at_sal (gdbarch
,
4894 sr_sal
, null_frame_id
);
4896 /* Restart without fiddling with the step ranges or
4903 /* Check for subroutine calls. The check for the current frame
4904 equalling the step ID is not necessary - the check of the
4905 previous frame's ID is sufficient - but it is a common case and
4906 cheaper than checking the previous frame's ID.
4908 NOTE: frame_id_eq will never report two invalid frame IDs as
4909 being equal, so to get into this block, both the current and
4910 previous frame must have valid frame IDs. */
4911 /* The outer_frame_id check is a heuristic to detect stepping
4912 through startup code. If we step over an instruction which
4913 sets the stack pointer from an invalid value to a valid value,
4914 we may detect that as a subroutine call from the mythical
4915 "outermost" function. This could be fixed by marking
4916 outermost frames as !stack_p,code_p,special_p. Then the
4917 initial outermost frame, before sp was valid, would
4918 have code_addr == &_start. See the comment in frame_id_eq
4920 if (!frame_id_eq (get_stack_frame_id (frame
),
4921 ecs
->event_thread
->control
.step_stack_frame_id
)
4922 && (frame_id_eq (frame_unwind_caller_id (get_current_frame ()),
4923 ecs
->event_thread
->control
.step_stack_frame_id
)
4924 && (!frame_id_eq (ecs
->event_thread
->control
.step_stack_frame_id
,
4926 || step_start_function
!= find_pc_function (stop_pc
))))
4928 CORE_ADDR real_stop_pc
;
4931 fprintf_unfiltered (gdb_stdlog
, "infrun: stepped into subroutine\n");
4933 if ((ecs
->event_thread
->control
.step_over_calls
== STEP_OVER_NONE
)
4934 || ((ecs
->event_thread
->control
.step_range_end
== 1)
4935 && in_prologue (gdbarch
, ecs
->event_thread
->prev_pc
,
4936 ecs
->stop_func_start
)))
4938 /* I presume that step_over_calls is only 0 when we're
4939 supposed to be stepping at the assembly language level
4940 ("stepi"). Just stop. */
4941 /* Also, maybe we just did a "nexti" inside a prolog, so we
4942 thought it was a subroutine call but it was not. Stop as
4944 /* And this works the same backward as frontward. MVS */
4945 ecs
->event_thread
->control
.stop_step
= 1;
4946 print_end_stepping_range_reason ();
4947 stop_stepping (ecs
);
4951 /* Reverse stepping through solib trampolines. */
4953 if (execution_direction
== EXEC_REVERSE
4954 && ecs
->event_thread
->control
.step_over_calls
!= STEP_OVER_NONE
4955 && (gdbarch_skip_trampoline_code (gdbarch
, frame
, stop_pc
)
4956 || (ecs
->stop_func_start
== 0
4957 && in_solib_dynsym_resolve_code (stop_pc
))))
4959 /* Any solib trampoline code can be handled in reverse
4960 by simply continuing to single-step. We have already
4961 executed the solib function (backwards), and a few
4962 steps will take us back through the trampoline to the
4968 if (ecs
->event_thread
->control
.step_over_calls
== STEP_OVER_ALL
)
4970 /* We're doing a "next".
4972 Normal (forward) execution: set a breakpoint at the
4973 callee's return address (the address at which the caller
4976 Reverse (backward) execution. set the step-resume
4977 breakpoint at the start of the function that we just
4978 stepped into (backwards), and continue to there. When we
4979 get there, we'll need to single-step back to the caller. */
4981 if (execution_direction
== EXEC_REVERSE
)
4983 /* If we're already at the start of the function, we've either
4984 just stepped backward into a single instruction function,
4985 or stepped back out of a signal handler to the first instruction
4986 of the function. Just keep going, which will single-step back
4988 if (ecs
->stop_func_start
!= stop_pc
&& ecs
->stop_func_start
!= 0)
4990 struct symtab_and_line sr_sal
;
4992 /* Normal function call return (static or dynamic). */
4994 sr_sal
.pc
= ecs
->stop_func_start
;
4995 sr_sal
.pspace
= get_frame_program_space (frame
);
4996 insert_step_resume_breakpoint_at_sal (gdbarch
,
4997 sr_sal
, null_frame_id
);
5001 insert_step_resume_breakpoint_at_caller (frame
);
5007 /* If we are in a function call trampoline (a stub between the
5008 calling routine and the real function), locate the real
5009 function. That's what tells us (a) whether we want to step
5010 into it at all, and (b) what prologue we want to run to the
5011 end of, if we do step into it. */
5012 real_stop_pc
= skip_language_trampoline (frame
, stop_pc
);
5013 if (real_stop_pc
== 0)
5014 real_stop_pc
= gdbarch_skip_trampoline_code (gdbarch
, frame
, stop_pc
);
5015 if (real_stop_pc
!= 0)
5016 ecs
->stop_func_start
= real_stop_pc
;
5018 if (real_stop_pc
!= 0 && in_solib_dynsym_resolve_code (real_stop_pc
))
5020 struct symtab_and_line sr_sal
;
5023 sr_sal
.pc
= ecs
->stop_func_start
;
5024 sr_sal
.pspace
= get_frame_program_space (frame
);
5026 insert_step_resume_breakpoint_at_sal (gdbarch
,
5027 sr_sal
, null_frame_id
);
5032 /* If we have line number information for the function we are
5033 thinking of stepping into and the function isn't on the skip
5036 If there are several symtabs at that PC (e.g. with include
5037 files), just want to know whether *any* of them have line
5038 numbers. find_pc_line handles this. */
5040 struct symtab_and_line tmp_sal
;
5042 tmp_sal
= find_pc_line (ecs
->stop_func_start
, 0);
5043 if (tmp_sal
.line
!= 0
5044 && !function_name_is_marked_for_skip (ecs
->stop_func_name
,
5047 if (execution_direction
== EXEC_REVERSE
)
5048 handle_step_into_function_backward (gdbarch
, ecs
);
5050 handle_step_into_function (gdbarch
, ecs
);
5055 /* If we have no line number and the step-stop-if-no-debug is
5056 set, we stop the step so that the user has a chance to switch
5057 in assembly mode. */
5058 if (ecs
->event_thread
->control
.step_over_calls
== STEP_OVER_UNDEBUGGABLE
5059 && step_stop_if_no_debug
)
5061 ecs
->event_thread
->control
.stop_step
= 1;
5062 print_end_stepping_range_reason ();
5063 stop_stepping (ecs
);
5067 if (execution_direction
== EXEC_REVERSE
)
5069 /* If we're already at the start of the function, we've either just
5070 stepped backward into a single instruction function without line
5071 number info, or stepped back out of a signal handler to the first
5072 instruction of the function without line number info. Just keep
5073 going, which will single-step back to the caller. */
5074 if (ecs
->stop_func_start
!= stop_pc
)
5076 /* Set a breakpoint at callee's start address.
5077 From there we can step once and be back in the caller. */
5078 struct symtab_and_line sr_sal
;
5081 sr_sal
.pc
= ecs
->stop_func_start
;
5082 sr_sal
.pspace
= get_frame_program_space (frame
);
5083 insert_step_resume_breakpoint_at_sal (gdbarch
,
5084 sr_sal
, null_frame_id
);
5088 /* Set a breakpoint at callee's return address (the address
5089 at which the caller will resume). */
5090 insert_step_resume_breakpoint_at_caller (frame
);
5096 /* Reverse stepping through solib trampolines. */
5098 if (execution_direction
== EXEC_REVERSE
5099 && ecs
->event_thread
->control
.step_over_calls
!= STEP_OVER_NONE
)
5101 if (gdbarch_skip_trampoline_code (gdbarch
, frame
, stop_pc
)
5102 || (ecs
->stop_func_start
== 0
5103 && in_solib_dynsym_resolve_code (stop_pc
)))
5105 /* Any solib trampoline code can be handled in reverse
5106 by simply continuing to single-step. We have already
5107 executed the solib function (backwards), and a few
5108 steps will take us back through the trampoline to the
5113 else if (in_solib_dynsym_resolve_code (stop_pc
))
5115 /* Stepped backward into the solib dynsym resolver.
5116 Set a breakpoint at its start and continue, then
5117 one more step will take us out. */
5118 struct symtab_and_line sr_sal
;
5121 sr_sal
.pc
= ecs
->stop_func_start
;
5122 sr_sal
.pspace
= get_frame_program_space (frame
);
5123 insert_step_resume_breakpoint_at_sal (gdbarch
,
5124 sr_sal
, null_frame_id
);
5130 stop_pc_sal
= find_pc_line (stop_pc
, 0);
5132 /* NOTE: tausq/2004-05-24: This if block used to be done before all
5133 the trampoline processing logic, however, there are some trampolines
5134 that have no names, so we should do trampoline handling first. */
5135 if (ecs
->event_thread
->control
.step_over_calls
== STEP_OVER_UNDEBUGGABLE
5136 && ecs
->stop_func_name
== NULL
5137 && stop_pc_sal
.line
== 0)
5140 fprintf_unfiltered (gdb_stdlog
,
5141 "infrun: stepped into undebuggable function\n");
5143 /* The inferior just stepped into, or returned to, an
5144 undebuggable function (where there is no debugging information
5145 and no line number corresponding to the address where the
5146 inferior stopped). Since we want to skip this kind of code,
5147 we keep going until the inferior returns from this
5148 function - unless the user has asked us not to (via
5149 set step-mode) or we no longer know how to get back
5150 to the call site. */
5151 if (step_stop_if_no_debug
5152 || !frame_id_p (frame_unwind_caller_id (frame
)))
5154 /* If we have no line number and the step-stop-if-no-debug
5155 is set, we stop the step so that the user has a chance to
5156 switch in assembly mode. */
5157 ecs
->event_thread
->control
.stop_step
= 1;
5158 print_end_stepping_range_reason ();
5159 stop_stepping (ecs
);
5164 /* Set a breakpoint at callee's return address (the address
5165 at which the caller will resume). */
5166 insert_step_resume_breakpoint_at_caller (frame
);
5172 if (ecs
->event_thread
->control
.step_range_end
== 1)
5174 /* It is stepi or nexti. We always want to stop stepping after
5177 fprintf_unfiltered (gdb_stdlog
, "infrun: stepi/nexti\n");
5178 ecs
->event_thread
->control
.stop_step
= 1;
5179 print_end_stepping_range_reason ();
5180 stop_stepping (ecs
);
5184 if (stop_pc_sal
.line
== 0)
5186 /* We have no line number information. That means to stop
5187 stepping (does this always happen right after one instruction,
5188 when we do "s" in a function with no line numbers,
5189 or can this happen as a result of a return or longjmp?). */
5191 fprintf_unfiltered (gdb_stdlog
, "infrun: no line number info\n");
5192 ecs
->event_thread
->control
.stop_step
= 1;
5193 print_end_stepping_range_reason ();
5194 stop_stepping (ecs
);
5198 /* Look for "calls" to inlined functions, part one. If the inline
5199 frame machinery detected some skipped call sites, we have entered
5200 a new inline function. */
5202 if (frame_id_eq (get_frame_id (get_current_frame ()),
5203 ecs
->event_thread
->control
.step_frame_id
)
5204 && inline_skipped_frames (ecs
->ptid
))
5206 struct symtab_and_line call_sal
;
5209 fprintf_unfiltered (gdb_stdlog
,
5210 "infrun: stepped into inlined function\n");
5212 find_frame_sal (get_current_frame (), &call_sal
);
5214 if (ecs
->event_thread
->control
.step_over_calls
!= STEP_OVER_ALL
)
5216 /* For "step", we're going to stop. But if the call site
5217 for this inlined function is on the same source line as
5218 we were previously stepping, go down into the function
5219 first. Otherwise stop at the call site. */
5221 if (call_sal
.line
== ecs
->event_thread
->current_line
5222 && call_sal
.symtab
== ecs
->event_thread
->current_symtab
)
5223 step_into_inline_frame (ecs
->ptid
);
5225 ecs
->event_thread
->control
.stop_step
= 1;
5226 print_end_stepping_range_reason ();
5227 stop_stepping (ecs
);
5232 /* For "next", we should stop at the call site if it is on a
5233 different source line. Otherwise continue through the
5234 inlined function. */
5235 if (call_sal
.line
== ecs
->event_thread
->current_line
5236 && call_sal
.symtab
== ecs
->event_thread
->current_symtab
)
5240 ecs
->event_thread
->control
.stop_step
= 1;
5241 print_end_stepping_range_reason ();
5242 stop_stepping (ecs
);
5248 /* Look for "calls" to inlined functions, part two. If we are still
5249 in the same real function we were stepping through, but we have
5250 to go further up to find the exact frame ID, we are stepping
5251 through a more inlined call beyond its call site. */
5253 if (get_frame_type (get_current_frame ()) == INLINE_FRAME
5254 && !frame_id_eq (get_frame_id (get_current_frame ()),
5255 ecs
->event_thread
->control
.step_frame_id
)
5256 && stepped_in_from (get_current_frame (),
5257 ecs
->event_thread
->control
.step_frame_id
))
5260 fprintf_unfiltered (gdb_stdlog
,
5261 "infrun: stepping through inlined function\n");
5263 if (ecs
->event_thread
->control
.step_over_calls
== STEP_OVER_ALL
)
5267 ecs
->event_thread
->control
.stop_step
= 1;
5268 print_end_stepping_range_reason ();
5269 stop_stepping (ecs
);
5274 if ((stop_pc
== stop_pc_sal
.pc
)
5275 && (ecs
->event_thread
->current_line
!= stop_pc_sal
.line
5276 || ecs
->event_thread
->current_symtab
!= stop_pc_sal
.symtab
))
5278 /* We are at the start of a different line. So stop. Note that
5279 we don't stop if we step into the middle of a different line.
5280 That is said to make things like for (;;) statements work
5283 fprintf_unfiltered (gdb_stdlog
,
5284 "infrun: stepped to a different line\n");
5285 ecs
->event_thread
->control
.stop_step
= 1;
5286 print_end_stepping_range_reason ();
5287 stop_stepping (ecs
);
5291 /* We aren't done stepping.
5293 Optimize by setting the stepping range to the line.
5294 (We might not be in the original line, but if we entered a
5295 new line in mid-statement, we continue stepping. This makes
5296 things like for(;;) statements work better.) */
5298 ecs
->event_thread
->control
.step_range_start
= stop_pc_sal
.pc
;
5299 ecs
->event_thread
->control
.step_range_end
= stop_pc_sal
.end
;
5300 ecs
->event_thread
->control
.may_range_step
= 1;
5301 set_step_info (frame
, stop_pc_sal
);
5304 fprintf_unfiltered (gdb_stdlog
, "infrun: keep going\n");
5308 /* Is thread TP in the middle of single-stepping? */
5311 currently_stepping (struct thread_info
*tp
)
5313 return ((tp
->control
.step_range_end
5314 && tp
->control
.step_resume_breakpoint
== NULL
)
5315 || tp
->control
.trap_expected
5316 || bpstat_should_step ());
5319 /* Returns true if any thread *but* the one passed in "data" is in the
5320 middle of stepping or of handling a "next". */
5323 currently_stepping_or_nexting_callback (struct thread_info
*tp
, void *data
)
5328 return (tp
->control
.step_range_end
5329 || tp
->control
.trap_expected
);
5332 /* Inferior has stepped into a subroutine call with source code that
5333 we should not step over. Do step to the first line of code in
5337 handle_step_into_function (struct gdbarch
*gdbarch
,
5338 struct execution_control_state
*ecs
)
5341 struct symtab_and_line stop_func_sal
, sr_sal
;
5343 fill_in_stop_func (gdbarch
, ecs
);
5345 s
= find_pc_symtab (stop_pc
);
5346 if (s
&& s
->language
!= language_asm
)
5347 ecs
->stop_func_start
= gdbarch_skip_prologue (gdbarch
,
5348 ecs
->stop_func_start
);
5350 stop_func_sal
= find_pc_line (ecs
->stop_func_start
, 0);
5351 /* Use the step_resume_break to step until the end of the prologue,
5352 even if that involves jumps (as it seems to on the vax under
5354 /* If the prologue ends in the middle of a source line, continue to
5355 the end of that source line (if it is still within the function).
5356 Otherwise, just go to end of prologue. */
5357 if (stop_func_sal
.end
5358 && stop_func_sal
.pc
!= ecs
->stop_func_start
5359 && stop_func_sal
.end
< ecs
->stop_func_end
)
5360 ecs
->stop_func_start
= stop_func_sal
.end
;
5362 /* Architectures which require breakpoint adjustment might not be able
5363 to place a breakpoint at the computed address. If so, the test
5364 ``ecs->stop_func_start == stop_pc'' will never succeed. Adjust
5365 ecs->stop_func_start to an address at which a breakpoint may be
5366 legitimately placed.
5368 Note: kevinb/2004-01-19: On FR-V, if this adjustment is not
5369 made, GDB will enter an infinite loop when stepping through
5370 optimized code consisting of VLIW instructions which contain
5371 subinstructions corresponding to different source lines. On
5372 FR-V, it's not permitted to place a breakpoint on any but the
5373 first subinstruction of a VLIW instruction. When a breakpoint is
5374 set, GDB will adjust the breakpoint address to the beginning of
5375 the VLIW instruction. Thus, we need to make the corresponding
5376 adjustment here when computing the stop address. */
5378 if (gdbarch_adjust_breakpoint_address_p (gdbarch
))
5380 ecs
->stop_func_start
5381 = gdbarch_adjust_breakpoint_address (gdbarch
,
5382 ecs
->stop_func_start
);
5385 if (ecs
->stop_func_start
== stop_pc
)
5387 /* We are already there: stop now. */
5388 ecs
->event_thread
->control
.stop_step
= 1;
5389 print_end_stepping_range_reason ();
5390 stop_stepping (ecs
);
5395 /* Put the step-breakpoint there and go until there. */
5396 init_sal (&sr_sal
); /* initialize to zeroes */
5397 sr_sal
.pc
= ecs
->stop_func_start
;
5398 sr_sal
.section
= find_pc_overlay (ecs
->stop_func_start
);
5399 sr_sal
.pspace
= get_frame_program_space (get_current_frame ());
5401 /* Do not specify what the fp should be when we stop since on
5402 some machines the prologue is where the new fp value is
5404 insert_step_resume_breakpoint_at_sal (gdbarch
, sr_sal
, null_frame_id
);
5406 /* And make sure stepping stops right away then. */
5407 ecs
->event_thread
->control
.step_range_end
5408 = ecs
->event_thread
->control
.step_range_start
;
5413 /* Inferior has stepped backward into a subroutine call with source
5414 code that we should not step over. Do step to the beginning of the
5415 last line of code in it. */
5418 handle_step_into_function_backward (struct gdbarch
*gdbarch
,
5419 struct execution_control_state
*ecs
)
5422 struct symtab_and_line stop_func_sal
;
5424 fill_in_stop_func (gdbarch
, ecs
);
5426 s
= find_pc_symtab (stop_pc
);
5427 if (s
&& s
->language
!= language_asm
)
5428 ecs
->stop_func_start
= gdbarch_skip_prologue (gdbarch
,
5429 ecs
->stop_func_start
);
5431 stop_func_sal
= find_pc_line (stop_pc
, 0);
5433 /* OK, we're just going to keep stepping here. */
5434 if (stop_func_sal
.pc
== stop_pc
)
5436 /* We're there already. Just stop stepping now. */
5437 ecs
->event_thread
->control
.stop_step
= 1;
5438 print_end_stepping_range_reason ();
5439 stop_stepping (ecs
);
5443 /* Else just reset the step range and keep going.
5444 No step-resume breakpoint, they don't work for
5445 epilogues, which can have multiple entry paths. */
5446 ecs
->event_thread
->control
.step_range_start
= stop_func_sal
.pc
;
5447 ecs
->event_thread
->control
.step_range_end
= stop_func_sal
.end
;
5453 /* Insert a "step-resume breakpoint" at SR_SAL with frame ID SR_ID.
5454 This is used to both functions and to skip over code. */
5457 insert_step_resume_breakpoint_at_sal_1 (struct gdbarch
*gdbarch
,
5458 struct symtab_and_line sr_sal
,
5459 struct frame_id sr_id
,
5460 enum bptype sr_type
)
5462 /* There should never be more than one step-resume or longjmp-resume
5463 breakpoint per thread, so we should never be setting a new
5464 step_resume_breakpoint when one is already active. */
5465 gdb_assert (inferior_thread ()->control
.step_resume_breakpoint
== NULL
);
5466 gdb_assert (sr_type
== bp_step_resume
|| sr_type
== bp_hp_step_resume
);
5469 fprintf_unfiltered (gdb_stdlog
,
5470 "infrun: inserting step-resume breakpoint at %s\n",
5471 paddress (gdbarch
, sr_sal
.pc
));
5473 inferior_thread ()->control
.step_resume_breakpoint
5474 = set_momentary_breakpoint (gdbarch
, sr_sal
, sr_id
, sr_type
);
5478 insert_step_resume_breakpoint_at_sal (struct gdbarch
*gdbarch
,
5479 struct symtab_and_line sr_sal
,
5480 struct frame_id sr_id
)
5482 insert_step_resume_breakpoint_at_sal_1 (gdbarch
,
5487 /* Insert a "high-priority step-resume breakpoint" at RETURN_FRAME.pc.
5488 This is used to skip a potential signal handler.
5490 This is called with the interrupted function's frame. The signal
5491 handler, when it returns, will resume the interrupted function at
5495 insert_hp_step_resume_breakpoint_at_frame (struct frame_info
*return_frame
)
5497 struct symtab_and_line sr_sal
;
5498 struct gdbarch
*gdbarch
;
5500 gdb_assert (return_frame
!= NULL
);
5501 init_sal (&sr_sal
); /* initialize to zeros */
5503 gdbarch
= get_frame_arch (return_frame
);
5504 sr_sal
.pc
= gdbarch_addr_bits_remove (gdbarch
, get_frame_pc (return_frame
));
5505 sr_sal
.section
= find_pc_overlay (sr_sal
.pc
);
5506 sr_sal
.pspace
= get_frame_program_space (return_frame
);
5508 insert_step_resume_breakpoint_at_sal_1 (gdbarch
, sr_sal
,
5509 get_stack_frame_id (return_frame
),
5513 /* Insert a "step-resume breakpoint" at the previous frame's PC. This
5514 is used to skip a function after stepping into it (for "next" or if
5515 the called function has no debugging information).
5517 The current function has almost always been reached by single
5518 stepping a call or return instruction. NEXT_FRAME belongs to the
5519 current function, and the breakpoint will be set at the caller's
5522 This is a separate function rather than reusing
5523 insert_hp_step_resume_breakpoint_at_frame in order to avoid
5524 get_prev_frame, which may stop prematurely (see the implementation
5525 of frame_unwind_caller_id for an example). */
5528 insert_step_resume_breakpoint_at_caller (struct frame_info
*next_frame
)
5530 struct symtab_and_line sr_sal
;
5531 struct gdbarch
*gdbarch
;
5533 /* We shouldn't have gotten here if we don't know where the call site
5535 gdb_assert (frame_id_p (frame_unwind_caller_id (next_frame
)));
5537 init_sal (&sr_sal
); /* initialize to zeros */
5539 gdbarch
= frame_unwind_caller_arch (next_frame
);
5540 sr_sal
.pc
= gdbarch_addr_bits_remove (gdbarch
,
5541 frame_unwind_caller_pc (next_frame
));
5542 sr_sal
.section
= find_pc_overlay (sr_sal
.pc
);
5543 sr_sal
.pspace
= frame_unwind_program_space (next_frame
);
5545 insert_step_resume_breakpoint_at_sal (gdbarch
, sr_sal
,
5546 frame_unwind_caller_id (next_frame
));
5549 /* Insert a "longjmp-resume" breakpoint at PC. This is used to set a
5550 new breakpoint at the target of a jmp_buf. The handling of
5551 longjmp-resume uses the same mechanisms used for handling
5552 "step-resume" breakpoints. */
5555 insert_longjmp_resume_breakpoint (struct gdbarch
*gdbarch
, CORE_ADDR pc
)
5557 /* There should never be more than one longjmp-resume breakpoint per
5558 thread, so we should never be setting a new
5559 longjmp_resume_breakpoint when one is already active. */
5560 gdb_assert (inferior_thread ()->control
.exception_resume_breakpoint
== NULL
);
5563 fprintf_unfiltered (gdb_stdlog
,
5564 "infrun: inserting longjmp-resume breakpoint at %s\n",
5565 paddress (gdbarch
, pc
));
5567 inferior_thread ()->control
.exception_resume_breakpoint
=
5568 set_momentary_breakpoint_at_pc (gdbarch
, pc
, bp_longjmp_resume
);
5571 /* Insert an exception resume breakpoint. TP is the thread throwing
5572 the exception. The block B is the block of the unwinder debug hook
5573 function. FRAME is the frame corresponding to the call to this
5574 function. SYM is the symbol of the function argument holding the
5575 target PC of the exception. */
5578 insert_exception_resume_breakpoint (struct thread_info
*tp
,
5580 struct frame_info
*frame
,
5583 volatile struct gdb_exception e
;
5585 /* We want to ignore errors here. */
5586 TRY_CATCH (e
, RETURN_MASK_ERROR
)
5588 struct symbol
*vsym
;
5589 struct value
*value
;
5591 struct breakpoint
*bp
;
5593 vsym
= lookup_symbol (SYMBOL_LINKAGE_NAME (sym
), b
, VAR_DOMAIN
, NULL
);
5594 value
= read_var_value (vsym
, frame
);
5595 /* If the value was optimized out, revert to the old behavior. */
5596 if (! value_optimized_out (value
))
5598 handler
= value_as_address (value
);
5601 fprintf_unfiltered (gdb_stdlog
,
5602 "infrun: exception resume at %lx\n",
5603 (unsigned long) handler
);
5605 bp
= set_momentary_breakpoint_at_pc (get_frame_arch (frame
),
5606 handler
, bp_exception_resume
);
5608 /* set_momentary_breakpoint_at_pc invalidates FRAME. */
5611 bp
->thread
= tp
->num
;
5612 inferior_thread ()->control
.exception_resume_breakpoint
= bp
;
5617 /* A helper for check_exception_resume that sets an
5618 exception-breakpoint based on a SystemTap probe. */
5621 insert_exception_resume_from_probe (struct thread_info
*tp
,
5622 const struct probe
*probe
,
5623 struct frame_info
*frame
)
5625 struct value
*arg_value
;
5627 struct breakpoint
*bp
;
5629 arg_value
= probe_safe_evaluate_at_pc (frame
, 1);
5633 handler
= value_as_address (arg_value
);
5636 fprintf_unfiltered (gdb_stdlog
,
5637 "infrun: exception resume at %s\n",
5638 paddress (get_objfile_arch (probe
->objfile
),
5641 bp
= set_momentary_breakpoint_at_pc (get_frame_arch (frame
),
5642 handler
, bp_exception_resume
);
5643 bp
->thread
= tp
->num
;
5644 inferior_thread ()->control
.exception_resume_breakpoint
= bp
;
5647 /* This is called when an exception has been intercepted. Check to
5648 see whether the exception's destination is of interest, and if so,
5649 set an exception resume breakpoint there. */
5652 check_exception_resume (struct execution_control_state
*ecs
,
5653 struct frame_info
*frame
)
5655 volatile struct gdb_exception e
;
5656 const struct probe
*probe
;
5657 struct symbol
*func
;
5659 /* First see if this exception unwinding breakpoint was set via a
5660 SystemTap probe point. If so, the probe has two arguments: the
5661 CFA and the HANDLER. We ignore the CFA, extract the handler, and
5662 set a breakpoint there. */
5663 probe
= find_probe_by_pc (get_frame_pc (frame
));
5666 insert_exception_resume_from_probe (ecs
->event_thread
, probe
, frame
);
5670 func
= get_frame_function (frame
);
5674 TRY_CATCH (e
, RETURN_MASK_ERROR
)
5677 struct block_iterator iter
;
5681 /* The exception breakpoint is a thread-specific breakpoint on
5682 the unwinder's debug hook, declared as:
5684 void _Unwind_DebugHook (void *cfa, void *handler);
5686 The CFA argument indicates the frame to which control is
5687 about to be transferred. HANDLER is the destination PC.
5689 We ignore the CFA and set a temporary breakpoint at HANDLER.
5690 This is not extremely efficient but it avoids issues in gdb
5691 with computing the DWARF CFA, and it also works even in weird
5692 cases such as throwing an exception from inside a signal
5695 b
= SYMBOL_BLOCK_VALUE (func
);
5696 ALL_BLOCK_SYMBOLS (b
, iter
, sym
)
5698 if (!SYMBOL_IS_ARGUMENT (sym
))
5705 insert_exception_resume_breakpoint (ecs
->event_thread
,
5714 stop_stepping (struct execution_control_state
*ecs
)
5717 fprintf_unfiltered (gdb_stdlog
, "infrun: stop_stepping\n");
5719 /* Let callers know we don't want to wait for the inferior anymore. */
5720 ecs
->wait_some_more
= 0;
5723 /* This function handles various cases where we need to continue
5724 waiting for the inferior. */
5725 /* (Used to be the keep_going: label in the old wait_for_inferior). */
5728 keep_going (struct execution_control_state
*ecs
)
5730 /* Make sure normal_stop is called if we get a QUIT handled before
5732 struct cleanup
*old_cleanups
= make_cleanup (resume_cleanups
, 0);
5734 /* Save the pc before execution, to compare with pc after stop. */
5735 ecs
->event_thread
->prev_pc
5736 = regcache_read_pc (get_thread_regcache (ecs
->ptid
));
5738 /* If we did not do break;, it means we should keep running the
5739 inferior and not return to debugger. */
5741 if (ecs
->event_thread
->control
.trap_expected
5742 && ecs
->event_thread
->suspend
.stop_signal
!= GDB_SIGNAL_TRAP
)
5744 /* We took a signal (which we are supposed to pass through to
5745 the inferior, else we'd not get here) and we haven't yet
5746 gotten our trap. Simply continue. */
5748 discard_cleanups (old_cleanups
);
5749 resume (currently_stepping (ecs
->event_thread
),
5750 ecs
->event_thread
->suspend
.stop_signal
);
5754 /* Either the trap was not expected, but we are continuing
5755 anyway (the user asked that this signal be passed to the
5758 The signal was SIGTRAP, e.g. it was our signal, but we
5759 decided we should resume from it.
5761 We're going to run this baby now!
5763 Note that insert_breakpoints won't try to re-insert
5764 already inserted breakpoints. Therefore, we don't
5765 care if breakpoints were already inserted, or not. */
5767 if (ecs
->event_thread
->stepping_over_breakpoint
)
5769 struct regcache
*thread_regcache
= get_thread_regcache (ecs
->ptid
);
5771 if (!use_displaced_stepping (get_regcache_arch (thread_regcache
)))
5772 /* Since we can't do a displaced step, we have to remove
5773 the breakpoint while we step it. To keep things
5774 simple, we remove them all. */
5775 remove_breakpoints ();
5779 volatile struct gdb_exception e
;
5781 /* Stop stepping when inserting breakpoints
5783 TRY_CATCH (e
, RETURN_MASK_ERROR
)
5785 insert_breakpoints ();
5789 exception_print (gdb_stderr
, e
);
5790 stop_stepping (ecs
);
5795 ecs
->event_thread
->control
.trap_expected
5796 = ecs
->event_thread
->stepping_over_breakpoint
;
5798 /* Do not deliver SIGNAL_TRAP (except when the user explicitly
5799 specifies that such a signal should be delivered to the
5802 Typically, this would occure when a user is debugging a
5803 target monitor on a simulator: the target monitor sets a
5804 breakpoint; the simulator encounters this break-point and
5805 halts the simulation handing control to GDB; GDB, noteing
5806 that the break-point isn't valid, returns control back to the
5807 simulator; the simulator then delivers the hardware
5808 equivalent of a SIGNAL_TRAP to the program being debugged. */
5810 if (ecs
->event_thread
->suspend
.stop_signal
== GDB_SIGNAL_TRAP
5811 && !signal_program
[ecs
->event_thread
->suspend
.stop_signal
])
5812 ecs
->event_thread
->suspend
.stop_signal
= GDB_SIGNAL_0
;
5814 discard_cleanups (old_cleanups
);
5815 resume (currently_stepping (ecs
->event_thread
),
5816 ecs
->event_thread
->suspend
.stop_signal
);
5819 prepare_to_wait (ecs
);
5822 /* This function normally comes after a resume, before
5823 handle_inferior_event exits. It takes care of any last bits of
5824 housekeeping, and sets the all-important wait_some_more flag. */
5827 prepare_to_wait (struct execution_control_state
*ecs
)
5830 fprintf_unfiltered (gdb_stdlog
, "infrun: prepare_to_wait\n");
5832 /* This is the old end of the while loop. Let everybody know we
5833 want to wait for the inferior some more and get called again
5835 ecs
->wait_some_more
= 1;
5838 /* Several print_*_reason functions to print why the inferior has stopped.
5839 We always print something when the inferior exits, or receives a signal.
5840 The rest of the cases are dealt with later on in normal_stop and
5841 print_it_typical. Ideally there should be a call to one of these
5842 print_*_reason functions functions from handle_inferior_event each time
5843 stop_stepping is called. */
5845 /* Print why the inferior has stopped.
5846 We are done with a step/next/si/ni command, print why the inferior has
5847 stopped. For now print nothing. Print a message only if not in the middle
5848 of doing a "step n" operation for n > 1. */
5851 print_end_stepping_range_reason (void)
5853 if ((!inferior_thread ()->step_multi
5854 || !inferior_thread ()->control
.stop_step
)
5855 && ui_out_is_mi_like_p (current_uiout
))
5856 ui_out_field_string (current_uiout
, "reason",
5857 async_reason_lookup (EXEC_ASYNC_END_STEPPING_RANGE
));
5860 /* The inferior was terminated by a signal, print why it stopped. */
5863 print_signal_exited_reason (enum gdb_signal siggnal
)
5865 struct ui_out
*uiout
= current_uiout
;
5867 annotate_signalled ();
5868 if (ui_out_is_mi_like_p (uiout
))
5870 (uiout
, "reason", async_reason_lookup (EXEC_ASYNC_EXITED_SIGNALLED
));
5871 ui_out_text (uiout
, "\nProgram terminated with signal ");
5872 annotate_signal_name ();
5873 ui_out_field_string (uiout
, "signal-name",
5874 gdb_signal_to_name (siggnal
));
5875 annotate_signal_name_end ();
5876 ui_out_text (uiout
, ", ");
5877 annotate_signal_string ();
5878 ui_out_field_string (uiout
, "signal-meaning",
5879 gdb_signal_to_string (siggnal
));
5880 annotate_signal_string_end ();
5881 ui_out_text (uiout
, ".\n");
5882 ui_out_text (uiout
, "The program no longer exists.\n");
5885 /* The inferior program is finished, print why it stopped. */
5888 print_exited_reason (int exitstatus
)
5890 struct inferior
*inf
= current_inferior ();
5891 const char *pidstr
= target_pid_to_str (pid_to_ptid (inf
->pid
));
5892 struct ui_out
*uiout
= current_uiout
;
5894 annotate_exited (exitstatus
);
5897 if (ui_out_is_mi_like_p (uiout
))
5898 ui_out_field_string (uiout
, "reason",
5899 async_reason_lookup (EXEC_ASYNC_EXITED
));
5900 ui_out_text (uiout
, "[Inferior ");
5901 ui_out_text (uiout
, plongest (inf
->num
));
5902 ui_out_text (uiout
, " (");
5903 ui_out_text (uiout
, pidstr
);
5904 ui_out_text (uiout
, ") exited with code ");
5905 ui_out_field_fmt (uiout
, "exit-code", "0%o", (unsigned int) exitstatus
);
5906 ui_out_text (uiout
, "]\n");
5910 if (ui_out_is_mi_like_p (uiout
))
5912 (uiout
, "reason", async_reason_lookup (EXEC_ASYNC_EXITED_NORMALLY
));
5913 ui_out_text (uiout
, "[Inferior ");
5914 ui_out_text (uiout
, plongest (inf
->num
));
5915 ui_out_text (uiout
, " (");
5916 ui_out_text (uiout
, pidstr
);
5917 ui_out_text (uiout
, ") exited normally]\n");
5919 /* Support the --return-child-result option. */
5920 return_child_result_value
= exitstatus
;
5923 /* Signal received, print why the inferior has stopped. The signal table
5924 tells us to print about it. */
5927 print_signal_received_reason (enum gdb_signal siggnal
)
5929 struct ui_out
*uiout
= current_uiout
;
5933 if (siggnal
== GDB_SIGNAL_0
&& !ui_out_is_mi_like_p (uiout
))
5935 struct thread_info
*t
= inferior_thread ();
5937 ui_out_text (uiout
, "\n[");
5938 ui_out_field_string (uiout
, "thread-name",
5939 target_pid_to_str (t
->ptid
));
5940 ui_out_field_fmt (uiout
, "thread-id", "] #%d", t
->num
);
5941 ui_out_text (uiout
, " stopped");
5945 ui_out_text (uiout
, "\nProgram received signal ");
5946 annotate_signal_name ();
5947 if (ui_out_is_mi_like_p (uiout
))
5949 (uiout
, "reason", async_reason_lookup (EXEC_ASYNC_SIGNAL_RECEIVED
));
5950 ui_out_field_string (uiout
, "signal-name",
5951 gdb_signal_to_name (siggnal
));
5952 annotate_signal_name_end ();
5953 ui_out_text (uiout
, ", ");
5954 annotate_signal_string ();
5955 ui_out_field_string (uiout
, "signal-meaning",
5956 gdb_signal_to_string (siggnal
));
5957 annotate_signal_string_end ();
5959 ui_out_text (uiout
, ".\n");
5962 /* Reverse execution: target ran out of history info, print why the inferior
5966 print_no_history_reason (void)
5968 ui_out_text (current_uiout
, "\nNo more reverse-execution history.\n");
5971 /* Here to return control to GDB when the inferior stops for real.
5972 Print appropriate messages, remove breakpoints, give terminal our modes.
5974 STOP_PRINT_FRAME nonzero means print the executing frame
5975 (pc, function, args, file, line number and line text).
5976 BREAKPOINTS_FAILED nonzero means stop was due to error
5977 attempting to insert breakpoints. */
5982 struct target_waitstatus last
;
5984 struct cleanup
*old_chain
= make_cleanup (null_cleanup
, NULL
);
5986 get_last_target_status (&last_ptid
, &last
);
5988 /* If an exception is thrown from this point on, make sure to
5989 propagate GDB's knowledge of the executing state to the
5990 frontend/user running state. A QUIT is an easy exception to see
5991 here, so do this before any filtered output. */
5993 make_cleanup (finish_thread_state_cleanup
, &minus_one_ptid
);
5994 else if (last
.kind
!= TARGET_WAITKIND_SIGNALLED
5995 && last
.kind
!= TARGET_WAITKIND_EXITED
5996 && last
.kind
!= TARGET_WAITKIND_NO_RESUMED
)
5997 make_cleanup (finish_thread_state_cleanup
, &inferior_ptid
);
5999 /* In non-stop mode, we don't want GDB to switch threads behind the
6000 user's back, to avoid races where the user is typing a command to
6001 apply to thread x, but GDB switches to thread y before the user
6002 finishes entering the command. */
6004 /* As with the notification of thread events, we want to delay
6005 notifying the user that we've switched thread context until
6006 the inferior actually stops.
6008 There's no point in saying anything if the inferior has exited.
6009 Note that SIGNALLED here means "exited with a signal", not
6010 "received a signal". */
6012 && !ptid_equal (previous_inferior_ptid
, inferior_ptid
)
6013 && target_has_execution
6014 && last
.kind
!= TARGET_WAITKIND_SIGNALLED
6015 && last
.kind
!= TARGET_WAITKIND_EXITED
6016 && last
.kind
!= TARGET_WAITKIND_NO_RESUMED
)
6018 target_terminal_ours_for_output ();
6019 printf_filtered (_("[Switching to %s]\n"),
6020 target_pid_to_str (inferior_ptid
));
6021 annotate_thread_changed ();
6022 previous_inferior_ptid
= inferior_ptid
;
6025 if (last
.kind
== TARGET_WAITKIND_NO_RESUMED
)
6027 gdb_assert (sync_execution
|| !target_can_async_p ());
6029 target_terminal_ours_for_output ();
6030 printf_filtered (_("No unwaited-for children left.\n"));
6033 if (!breakpoints_always_inserted_mode () && target_has_execution
)
6035 if (remove_breakpoints ())
6037 target_terminal_ours_for_output ();
6038 printf_filtered (_("Cannot remove breakpoints because "
6039 "program is no longer writable.\nFurther "
6040 "execution is probably impossible.\n"));
6044 /* If an auto-display called a function and that got a signal,
6045 delete that auto-display to avoid an infinite recursion. */
6047 if (stopped_by_random_signal
)
6048 disable_current_display ();
6050 /* Don't print a message if in the middle of doing a "step n"
6051 operation for n > 1 */
6052 if (target_has_execution
6053 && last
.kind
!= TARGET_WAITKIND_SIGNALLED
6054 && last
.kind
!= TARGET_WAITKIND_EXITED
6055 && inferior_thread ()->step_multi
6056 && inferior_thread ()->control
.stop_step
)
6059 target_terminal_ours ();
6060 async_enable_stdin ();
6062 /* Set the current source location. This will also happen if we
6063 display the frame below, but the current SAL will be incorrect
6064 during a user hook-stop function. */
6065 if (has_stack_frames () && !stop_stack_dummy
)
6066 set_current_sal_from_frame (get_current_frame (), 1);
6068 /* Let the user/frontend see the threads as stopped. */
6069 do_cleanups (old_chain
);
6071 /* Look up the hook_stop and run it (CLI internally handles problem
6072 of stop_command's pre-hook not existing). */
6074 catch_errors (hook_stop_stub
, stop_command
,
6075 "Error while running hook_stop:\n", RETURN_MASK_ALL
);
6077 if (!has_stack_frames ())
6080 if (last
.kind
== TARGET_WAITKIND_SIGNALLED
6081 || last
.kind
== TARGET_WAITKIND_EXITED
)
6084 /* Select innermost stack frame - i.e., current frame is frame 0,
6085 and current location is based on that.
6086 Don't do this on return from a stack dummy routine,
6087 or if the program has exited. */
6089 if (!stop_stack_dummy
)
6091 select_frame (get_current_frame ());
6093 /* Print current location without a level number, if
6094 we have changed functions or hit a breakpoint.
6095 Print source line if we have one.
6096 bpstat_print() contains the logic deciding in detail
6097 what to print, based on the event(s) that just occurred. */
6099 /* If --batch-silent is enabled then there's no need to print the current
6100 source location, and to try risks causing an error message about
6101 missing source files. */
6102 if (stop_print_frame
&& !batch_silent
)
6106 int do_frame_printing
= 1;
6107 struct thread_info
*tp
= inferior_thread ();
6109 bpstat_ret
= bpstat_print (tp
->control
.stop_bpstat
, last
.kind
);
6113 /* FIXME: cagney/2002-12-01: Given that a frame ID does
6114 (or should) carry around the function and does (or
6115 should) use that when doing a frame comparison. */
6116 if (tp
->control
.stop_step
6117 && frame_id_eq (tp
->control
.step_frame_id
,
6118 get_frame_id (get_current_frame ()))
6119 && step_start_function
== find_pc_function (stop_pc
))
6120 source_flag
= SRC_LINE
; /* Finished step, just
6121 print source line. */
6123 source_flag
= SRC_AND_LOC
; /* Print location and
6126 case PRINT_SRC_AND_LOC
:
6127 source_flag
= SRC_AND_LOC
; /* Print location and
6130 case PRINT_SRC_ONLY
:
6131 source_flag
= SRC_LINE
;
6134 source_flag
= SRC_LINE
; /* something bogus */
6135 do_frame_printing
= 0;
6138 internal_error (__FILE__
, __LINE__
, _("Unknown value."));
6141 /* The behavior of this routine with respect to the source
6143 SRC_LINE: Print only source line
6144 LOCATION: Print only location
6145 SRC_AND_LOC: Print location and source line. */
6146 if (do_frame_printing
)
6147 print_stack_frame (get_selected_frame (NULL
), 0, source_flag
, 1);
6149 /* Display the auto-display expressions. */
6154 /* Save the function value return registers, if we care.
6155 We might be about to restore their previous contents. */
6156 if (inferior_thread ()->control
.proceed_to_finish
6157 && execution_direction
!= EXEC_REVERSE
)
6159 /* This should not be necessary. */
6161 regcache_xfree (stop_registers
);
6163 /* NB: The copy goes through to the target picking up the value of
6164 all the registers. */
6165 stop_registers
= regcache_dup (get_current_regcache ());
6168 if (stop_stack_dummy
== STOP_STACK_DUMMY
)
6170 /* Pop the empty frame that contains the stack dummy.
6171 This also restores inferior state prior to the call
6172 (struct infcall_suspend_state). */
6173 struct frame_info
*frame
= get_current_frame ();
6175 gdb_assert (get_frame_type (frame
) == DUMMY_FRAME
);
6177 /* frame_pop() calls reinit_frame_cache as the last thing it
6178 does which means there's currently no selected frame. We
6179 don't need to re-establish a selected frame if the dummy call
6180 returns normally, that will be done by
6181 restore_infcall_control_state. However, we do have to handle
6182 the case where the dummy call is returning after being
6183 stopped (e.g. the dummy call previously hit a breakpoint).
6184 We can't know which case we have so just always re-establish
6185 a selected frame here. */
6186 select_frame (get_current_frame ());
6190 annotate_stopped ();
6192 /* Suppress the stop observer if we're in the middle of:
6194 - a step n (n > 1), as there still more steps to be done.
6196 - a "finish" command, as the observer will be called in
6197 finish_command_continuation, so it can include the inferior
6198 function's return value.
6200 - calling an inferior function, as we pretend we inferior didn't
6201 run at all. The return value of the call is handled by the
6202 expression evaluator, through call_function_by_hand. */
6204 if (!target_has_execution
6205 || last
.kind
== TARGET_WAITKIND_SIGNALLED
6206 || last
.kind
== TARGET_WAITKIND_EXITED
6207 || last
.kind
== TARGET_WAITKIND_NO_RESUMED
6208 || (!(inferior_thread ()->step_multi
6209 && inferior_thread ()->control
.stop_step
)
6210 && !(inferior_thread ()->control
.stop_bpstat
6211 && inferior_thread ()->control
.proceed_to_finish
)
6212 && !inferior_thread ()->control
.in_infcall
))
6214 if (!ptid_equal (inferior_ptid
, null_ptid
))
6215 observer_notify_normal_stop (inferior_thread ()->control
.stop_bpstat
,
6218 observer_notify_normal_stop (NULL
, stop_print_frame
);
6221 if (target_has_execution
)
6223 if (last
.kind
!= TARGET_WAITKIND_SIGNALLED
6224 && last
.kind
!= TARGET_WAITKIND_EXITED
)
6225 /* Delete the breakpoint we stopped at, if it wants to be deleted.
6226 Delete any breakpoint that is to be deleted at the next stop. */
6227 breakpoint_auto_delete (inferior_thread ()->control
.stop_bpstat
);
6230 /* Try to get rid of automatically added inferiors that are no
6231 longer needed. Keeping those around slows down things linearly.
6232 Note that this never removes the current inferior. */
6237 hook_stop_stub (void *cmd
)
6239 execute_cmd_pre_hook ((struct cmd_list_element
*) cmd
);
6244 signal_stop_state (int signo
)
6246 return signal_stop
[signo
];
6250 signal_print_state (int signo
)
6252 return signal_print
[signo
];
6256 signal_pass_state (int signo
)
6258 return signal_program
[signo
];
6262 signal_cache_update (int signo
)
6266 for (signo
= 0; signo
< (int) GDB_SIGNAL_LAST
; signo
++)
6267 signal_cache_update (signo
);
6272 signal_pass
[signo
] = (signal_stop
[signo
] == 0
6273 && signal_print
[signo
] == 0
6274 && signal_program
[signo
] == 1
6275 && signal_catch
[signo
] == 0);
6279 signal_stop_update (int signo
, int state
)
6281 int ret
= signal_stop
[signo
];
6283 signal_stop
[signo
] = state
;
6284 signal_cache_update (signo
);
6289 signal_print_update (int signo
, int state
)
6291 int ret
= signal_print
[signo
];
6293 signal_print
[signo
] = state
;
6294 signal_cache_update (signo
);
6299 signal_pass_update (int signo
, int state
)
6301 int ret
= signal_program
[signo
];
6303 signal_program
[signo
] = state
;
6304 signal_cache_update (signo
);
6308 /* Update the global 'signal_catch' from INFO and notify the
6312 signal_catch_update (const unsigned int *info
)
6316 for (i
= 0; i
< GDB_SIGNAL_LAST
; ++i
)
6317 signal_catch
[i
] = info
[i
] > 0;
6318 signal_cache_update (-1);
6319 target_pass_signals ((int) GDB_SIGNAL_LAST
, signal_pass
);
6323 sig_print_header (void)
6325 printf_filtered (_("Signal Stop\tPrint\tPass "
6326 "to program\tDescription\n"));
6330 sig_print_info (enum gdb_signal oursig
)
6332 const char *name
= gdb_signal_to_name (oursig
);
6333 int name_padding
= 13 - strlen (name
);
6335 if (name_padding
<= 0)
6338 printf_filtered ("%s", name
);
6339 printf_filtered ("%*.*s ", name_padding
, name_padding
, " ");
6340 printf_filtered ("%s\t", signal_stop
[oursig
] ? "Yes" : "No");
6341 printf_filtered ("%s\t", signal_print
[oursig
] ? "Yes" : "No");
6342 printf_filtered ("%s\t\t", signal_program
[oursig
] ? "Yes" : "No");
6343 printf_filtered ("%s\n", gdb_signal_to_string (oursig
));
6346 /* Specify how various signals in the inferior should be handled. */
6349 handle_command (char *args
, int from_tty
)
6352 int digits
, wordlen
;
6353 int sigfirst
, signum
, siglast
;
6354 enum gdb_signal oursig
;
6357 unsigned char *sigs
;
6358 struct cleanup
*old_chain
;
6362 error_no_arg (_("signal to handle"));
6365 /* Allocate and zero an array of flags for which signals to handle. */
6367 nsigs
= (int) GDB_SIGNAL_LAST
;
6368 sigs
= (unsigned char *) alloca (nsigs
);
6369 memset (sigs
, 0, nsigs
);
6371 /* Break the command line up into args. */
6373 argv
= gdb_buildargv (args
);
6374 old_chain
= make_cleanup_freeargv (argv
);
6376 /* Walk through the args, looking for signal oursigs, signal names, and
6377 actions. Signal numbers and signal names may be interspersed with
6378 actions, with the actions being performed for all signals cumulatively
6379 specified. Signal ranges can be specified as <LOW>-<HIGH>. */
6381 while (*argv
!= NULL
)
6383 wordlen
= strlen (*argv
);
6384 for (digits
= 0; isdigit ((*argv
)[digits
]); digits
++)
6388 sigfirst
= siglast
= -1;
6390 if (wordlen
>= 1 && !strncmp (*argv
, "all", wordlen
))
6392 /* Apply action to all signals except those used by the
6393 debugger. Silently skip those. */
6396 siglast
= nsigs
- 1;
6398 else if (wordlen
>= 1 && !strncmp (*argv
, "stop", wordlen
))
6400 SET_SIGS (nsigs
, sigs
, signal_stop
);
6401 SET_SIGS (nsigs
, sigs
, signal_print
);
6403 else if (wordlen
>= 1 && !strncmp (*argv
, "ignore", wordlen
))
6405 UNSET_SIGS (nsigs
, sigs
, signal_program
);
6407 else if (wordlen
>= 2 && !strncmp (*argv
, "print", wordlen
))
6409 SET_SIGS (nsigs
, sigs
, signal_print
);
6411 else if (wordlen
>= 2 && !strncmp (*argv
, "pass", wordlen
))
6413 SET_SIGS (nsigs
, sigs
, signal_program
);
6415 else if (wordlen
>= 3 && !strncmp (*argv
, "nostop", wordlen
))
6417 UNSET_SIGS (nsigs
, sigs
, signal_stop
);
6419 else if (wordlen
>= 3 && !strncmp (*argv
, "noignore", wordlen
))
6421 SET_SIGS (nsigs
, sigs
, signal_program
);
6423 else if (wordlen
>= 4 && !strncmp (*argv
, "noprint", wordlen
))
6425 UNSET_SIGS (nsigs
, sigs
, signal_print
);
6426 UNSET_SIGS (nsigs
, sigs
, signal_stop
);
6428 else if (wordlen
>= 4 && !strncmp (*argv
, "nopass", wordlen
))
6430 UNSET_SIGS (nsigs
, sigs
, signal_program
);
6432 else if (digits
> 0)
6434 /* It is numeric. The numeric signal refers to our own
6435 internal signal numbering from target.h, not to host/target
6436 signal number. This is a feature; users really should be
6437 using symbolic names anyway, and the common ones like
6438 SIGHUP, SIGINT, SIGALRM, etc. will work right anyway. */
6440 sigfirst
= siglast
= (int)
6441 gdb_signal_from_command (atoi (*argv
));
6442 if ((*argv
)[digits
] == '-')
6445 gdb_signal_from_command (atoi ((*argv
) + digits
+ 1));
6447 if (sigfirst
> siglast
)
6449 /* Bet he didn't figure we'd think of this case... */
6457 oursig
= gdb_signal_from_name (*argv
);
6458 if (oursig
!= GDB_SIGNAL_UNKNOWN
)
6460 sigfirst
= siglast
= (int) oursig
;
6464 /* Not a number and not a recognized flag word => complain. */
6465 error (_("Unrecognized or ambiguous flag word: \"%s\"."), *argv
);
6469 /* If any signal numbers or symbol names were found, set flags for
6470 which signals to apply actions to. */
6472 for (signum
= sigfirst
; signum
>= 0 && signum
<= siglast
; signum
++)
6474 switch ((enum gdb_signal
) signum
)
6476 case GDB_SIGNAL_TRAP
:
6477 case GDB_SIGNAL_INT
:
6478 if (!allsigs
&& !sigs
[signum
])
6480 if (query (_("%s is used by the debugger.\n\
6481 Are you sure you want to change it? "),
6482 gdb_signal_to_name ((enum gdb_signal
) signum
)))
6488 printf_unfiltered (_("Not confirmed, unchanged.\n"));
6489 gdb_flush (gdb_stdout
);
6494 case GDB_SIGNAL_DEFAULT
:
6495 case GDB_SIGNAL_UNKNOWN
:
6496 /* Make sure that "all" doesn't print these. */
6507 for (signum
= 0; signum
< nsigs
; signum
++)
6510 signal_cache_update (-1);
6511 target_pass_signals ((int) GDB_SIGNAL_LAST
, signal_pass
);
6512 target_program_signals ((int) GDB_SIGNAL_LAST
, signal_program
);
6516 /* Show the results. */
6517 sig_print_header ();
6518 for (; signum
< nsigs
; signum
++)
6520 sig_print_info (signum
);
6526 do_cleanups (old_chain
);
6529 /* Complete the "handle" command. */
6531 static VEC (char_ptr
) *
6532 handle_completer (struct cmd_list_element
*ignore
,
6533 const char *text
, const char *word
)
6535 VEC (char_ptr
) *vec_signals
, *vec_keywords
, *return_val
;
6536 static const char * const keywords
[] =
6550 vec_signals
= signal_completer (ignore
, text
, word
);
6551 vec_keywords
= complete_on_enum (keywords
, word
, word
);
6553 return_val
= VEC_merge (char_ptr
, vec_signals
, vec_keywords
);
6554 VEC_free (char_ptr
, vec_signals
);
6555 VEC_free (char_ptr
, vec_keywords
);
6560 xdb_handle_command (char *args
, int from_tty
)
6563 struct cleanup
*old_chain
;
6566 error_no_arg (_("xdb command"));
6568 /* Break the command line up into args. */
6570 argv
= gdb_buildargv (args
);
6571 old_chain
= make_cleanup_freeargv (argv
);
6572 if (argv
[1] != (char *) NULL
)
6577 bufLen
= strlen (argv
[0]) + 20;
6578 argBuf
= (char *) xmalloc (bufLen
);
6582 enum gdb_signal oursig
;
6584 oursig
= gdb_signal_from_name (argv
[0]);
6585 memset (argBuf
, 0, bufLen
);
6586 if (strcmp (argv
[1], "Q") == 0)
6587 sprintf (argBuf
, "%s %s", argv
[0], "noprint");
6590 if (strcmp (argv
[1], "s") == 0)
6592 if (!signal_stop
[oursig
])
6593 sprintf (argBuf
, "%s %s", argv
[0], "stop");
6595 sprintf (argBuf
, "%s %s", argv
[0], "nostop");
6597 else if (strcmp (argv
[1], "i") == 0)
6599 if (!signal_program
[oursig
])
6600 sprintf (argBuf
, "%s %s", argv
[0], "pass");
6602 sprintf (argBuf
, "%s %s", argv
[0], "nopass");
6604 else if (strcmp (argv
[1], "r") == 0)
6606 if (!signal_print
[oursig
])
6607 sprintf (argBuf
, "%s %s", argv
[0], "print");
6609 sprintf (argBuf
, "%s %s", argv
[0], "noprint");
6615 handle_command (argBuf
, from_tty
);
6617 printf_filtered (_("Invalid signal handling flag.\n"));
6622 do_cleanups (old_chain
);
6626 gdb_signal_from_command (int num
)
6628 if (num
>= 1 && num
<= 15)
6629 return (enum gdb_signal
) num
;
6630 error (_("Only signals 1-15 are valid as numeric signals.\n\
6631 Use \"info signals\" for a list of symbolic signals."));
6634 /* Print current contents of the tables set by the handle command.
6635 It is possible we should just be printing signals actually used
6636 by the current target (but for things to work right when switching
6637 targets, all signals should be in the signal tables). */
6640 signals_info (char *signum_exp
, int from_tty
)
6642 enum gdb_signal oursig
;
6644 sig_print_header ();
6648 /* First see if this is a symbol name. */
6649 oursig
= gdb_signal_from_name (signum_exp
);
6650 if (oursig
== GDB_SIGNAL_UNKNOWN
)
6652 /* No, try numeric. */
6654 gdb_signal_from_command (parse_and_eval_long (signum_exp
));
6656 sig_print_info (oursig
);
6660 printf_filtered ("\n");
6661 /* These ugly casts brought to you by the native VAX compiler. */
6662 for (oursig
= GDB_SIGNAL_FIRST
;
6663 (int) oursig
< (int) GDB_SIGNAL_LAST
;
6664 oursig
= (enum gdb_signal
) ((int) oursig
+ 1))
6668 if (oursig
!= GDB_SIGNAL_UNKNOWN
6669 && oursig
!= GDB_SIGNAL_DEFAULT
&& oursig
!= GDB_SIGNAL_0
)
6670 sig_print_info (oursig
);
6673 printf_filtered (_("\nUse the \"handle\" command "
6674 "to change these tables.\n"));
6677 /* Check if it makes sense to read $_siginfo from the current thread
6678 at this point. If not, throw an error. */
6681 validate_siginfo_access (void)
6683 /* No current inferior, no siginfo. */
6684 if (ptid_equal (inferior_ptid
, null_ptid
))
6685 error (_("No thread selected."));
6687 /* Don't try to read from a dead thread. */
6688 if (is_exited (inferior_ptid
))
6689 error (_("The current thread has terminated"));
6691 /* ... or from a spinning thread. */
6692 if (is_running (inferior_ptid
))
6693 error (_("Selected thread is running."));
6696 /* The $_siginfo convenience variable is a bit special. We don't know
6697 for sure the type of the value until we actually have a chance to
6698 fetch the data. The type can change depending on gdbarch, so it is
6699 also dependent on which thread you have selected.
6701 1. making $_siginfo be an internalvar that creates a new value on
6704 2. making the value of $_siginfo be an lval_computed value. */
6706 /* This function implements the lval_computed support for reading a
6710 siginfo_value_read (struct value
*v
)
6712 LONGEST transferred
;
6714 validate_siginfo_access ();
6717 target_read (¤t_target
, TARGET_OBJECT_SIGNAL_INFO
,
6719 value_contents_all_raw (v
),
6721 TYPE_LENGTH (value_type (v
)));
6723 if (transferred
!= TYPE_LENGTH (value_type (v
)))
6724 error (_("Unable to read siginfo"));
6727 /* This function implements the lval_computed support for writing a
6731 siginfo_value_write (struct value
*v
, struct value
*fromval
)
6733 LONGEST transferred
;
6735 validate_siginfo_access ();
6737 transferred
= target_write (¤t_target
,
6738 TARGET_OBJECT_SIGNAL_INFO
,
6740 value_contents_all_raw (fromval
),
6742 TYPE_LENGTH (value_type (fromval
)));
6744 if (transferred
!= TYPE_LENGTH (value_type (fromval
)))
6745 error (_("Unable to write siginfo"));
6748 static const struct lval_funcs siginfo_value_funcs
=
6754 /* Return a new value with the correct type for the siginfo object of
6755 the current thread using architecture GDBARCH. Return a void value
6756 if there's no object available. */
6758 static struct value
*
6759 siginfo_make_value (struct gdbarch
*gdbarch
, struct internalvar
*var
,
6762 if (target_has_stack
6763 && !ptid_equal (inferior_ptid
, null_ptid
)
6764 && gdbarch_get_siginfo_type_p (gdbarch
))
6766 struct type
*type
= gdbarch_get_siginfo_type (gdbarch
);
6768 return allocate_computed_value (type
, &siginfo_value_funcs
, NULL
);
6771 return allocate_value (builtin_type (gdbarch
)->builtin_void
);
6775 /* infcall_suspend_state contains state about the program itself like its
6776 registers and any signal it received when it last stopped.
6777 This state must be restored regardless of how the inferior function call
6778 ends (either successfully, or after it hits a breakpoint or signal)
6779 if the program is to properly continue where it left off. */
6781 struct infcall_suspend_state
6783 struct thread_suspend_state thread_suspend
;
6784 #if 0 /* Currently unused and empty structures are not valid C. */
6785 struct inferior_suspend_state inferior_suspend
;
6790 struct regcache
*registers
;
6792 /* Format of SIGINFO_DATA or NULL if it is not present. */
6793 struct gdbarch
*siginfo_gdbarch
;
6795 /* The inferior format depends on SIGINFO_GDBARCH and it has a length of
6796 TYPE_LENGTH (gdbarch_get_siginfo_type ()). For different gdbarch the
6797 content would be invalid. */
6798 gdb_byte
*siginfo_data
;
6801 struct infcall_suspend_state
*
6802 save_infcall_suspend_state (void)
6804 struct infcall_suspend_state
*inf_state
;
6805 struct thread_info
*tp
= inferior_thread ();
6807 struct inferior
*inf
= current_inferior ();
6809 struct regcache
*regcache
= get_current_regcache ();
6810 struct gdbarch
*gdbarch
= get_regcache_arch (regcache
);
6811 gdb_byte
*siginfo_data
= NULL
;
6813 if (gdbarch_get_siginfo_type_p (gdbarch
))
6815 struct type
*type
= gdbarch_get_siginfo_type (gdbarch
);
6816 size_t len
= TYPE_LENGTH (type
);
6817 struct cleanup
*back_to
;
6819 siginfo_data
= xmalloc (len
);
6820 back_to
= make_cleanup (xfree
, siginfo_data
);
6822 if (target_read (¤t_target
, TARGET_OBJECT_SIGNAL_INFO
, NULL
,
6823 siginfo_data
, 0, len
) == len
)
6824 discard_cleanups (back_to
);
6827 /* Errors ignored. */
6828 do_cleanups (back_to
);
6829 siginfo_data
= NULL
;
6833 inf_state
= XZALLOC (struct infcall_suspend_state
);
6837 inf_state
->siginfo_gdbarch
= gdbarch
;
6838 inf_state
->siginfo_data
= siginfo_data
;
6841 inf_state
->thread_suspend
= tp
->suspend
;
6842 #if 0 /* Currently unused and empty structures are not valid C. */
6843 inf_state
->inferior_suspend
= inf
->suspend
;
6846 /* run_inferior_call will not use the signal due to its `proceed' call with
6847 GDB_SIGNAL_0 anyway. */
6848 tp
->suspend
.stop_signal
= GDB_SIGNAL_0
;
6850 inf_state
->stop_pc
= stop_pc
;
6852 inf_state
->registers
= regcache_dup (regcache
);
6857 /* Restore inferior session state to INF_STATE. */
6860 restore_infcall_suspend_state (struct infcall_suspend_state
*inf_state
)
6862 struct thread_info
*tp
= inferior_thread ();
6864 struct inferior
*inf
= current_inferior ();
6866 struct regcache
*regcache
= get_current_regcache ();
6867 struct gdbarch
*gdbarch
= get_regcache_arch (regcache
);
6869 tp
->suspend
= inf_state
->thread_suspend
;
6870 #if 0 /* Currently unused and empty structures are not valid C. */
6871 inf
->suspend
= inf_state
->inferior_suspend
;
6874 stop_pc
= inf_state
->stop_pc
;
6876 if (inf_state
->siginfo_gdbarch
== gdbarch
)
6878 struct type
*type
= gdbarch_get_siginfo_type (gdbarch
);
6880 /* Errors ignored. */
6881 target_write (¤t_target
, TARGET_OBJECT_SIGNAL_INFO
, NULL
,
6882 inf_state
->siginfo_data
, 0, TYPE_LENGTH (type
));
6885 /* The inferior can be gone if the user types "print exit(0)"
6886 (and perhaps other times). */
6887 if (target_has_execution
)
6888 /* NB: The register write goes through to the target. */
6889 regcache_cpy (regcache
, inf_state
->registers
);
6891 discard_infcall_suspend_state (inf_state
);
6895 do_restore_infcall_suspend_state_cleanup (void *state
)
6897 restore_infcall_suspend_state (state
);
6901 make_cleanup_restore_infcall_suspend_state
6902 (struct infcall_suspend_state
*inf_state
)
6904 return make_cleanup (do_restore_infcall_suspend_state_cleanup
, inf_state
);
6908 discard_infcall_suspend_state (struct infcall_suspend_state
*inf_state
)
6910 regcache_xfree (inf_state
->registers
);
6911 xfree (inf_state
->siginfo_data
);
6916 get_infcall_suspend_state_regcache (struct infcall_suspend_state
*inf_state
)
6918 return inf_state
->registers
;
6921 /* infcall_control_state contains state regarding gdb's control of the
6922 inferior itself like stepping control. It also contains session state like
6923 the user's currently selected frame. */
6925 struct infcall_control_state
6927 struct thread_control_state thread_control
;
6928 struct inferior_control_state inferior_control
;
6931 enum stop_stack_kind stop_stack_dummy
;
6932 int stopped_by_random_signal
;
6933 int stop_after_trap
;
6935 /* ID if the selected frame when the inferior function call was made. */
6936 struct frame_id selected_frame_id
;
6939 /* Save all of the information associated with the inferior<==>gdb
6942 struct infcall_control_state
*
6943 save_infcall_control_state (void)
6945 struct infcall_control_state
*inf_status
= xmalloc (sizeof (*inf_status
));
6946 struct thread_info
*tp
= inferior_thread ();
6947 struct inferior
*inf
= current_inferior ();
6949 inf_status
->thread_control
= tp
->control
;
6950 inf_status
->inferior_control
= inf
->control
;
6952 tp
->control
.step_resume_breakpoint
= NULL
;
6953 tp
->control
.exception_resume_breakpoint
= NULL
;
6955 /* Save original bpstat chain to INF_STATUS; replace it in TP with copy of
6956 chain. If caller's caller is walking the chain, they'll be happier if we
6957 hand them back the original chain when restore_infcall_control_state is
6959 tp
->control
.stop_bpstat
= bpstat_copy (tp
->control
.stop_bpstat
);
6962 inf_status
->stop_stack_dummy
= stop_stack_dummy
;
6963 inf_status
->stopped_by_random_signal
= stopped_by_random_signal
;
6964 inf_status
->stop_after_trap
= stop_after_trap
;
6966 inf_status
->selected_frame_id
= get_frame_id (get_selected_frame (NULL
));
6972 restore_selected_frame (void *args
)
6974 struct frame_id
*fid
= (struct frame_id
*) args
;
6975 struct frame_info
*frame
;
6977 frame
= frame_find_by_id (*fid
);
6979 /* If inf_status->selected_frame_id is NULL, there was no previously
6983 warning (_("Unable to restore previously selected frame."));
6987 select_frame (frame
);
6992 /* Restore inferior session state to INF_STATUS. */
6995 restore_infcall_control_state (struct infcall_control_state
*inf_status
)
6997 struct thread_info
*tp
= inferior_thread ();
6998 struct inferior
*inf
= current_inferior ();
7000 if (tp
->control
.step_resume_breakpoint
)
7001 tp
->control
.step_resume_breakpoint
->disposition
= disp_del_at_next_stop
;
7003 if (tp
->control
.exception_resume_breakpoint
)
7004 tp
->control
.exception_resume_breakpoint
->disposition
7005 = disp_del_at_next_stop
;
7007 /* Handle the bpstat_copy of the chain. */
7008 bpstat_clear (&tp
->control
.stop_bpstat
);
7010 tp
->control
= inf_status
->thread_control
;
7011 inf
->control
= inf_status
->inferior_control
;
7014 stop_stack_dummy
= inf_status
->stop_stack_dummy
;
7015 stopped_by_random_signal
= inf_status
->stopped_by_random_signal
;
7016 stop_after_trap
= inf_status
->stop_after_trap
;
7018 if (target_has_stack
)
7020 /* The point of catch_errors is that if the stack is clobbered,
7021 walking the stack might encounter a garbage pointer and
7022 error() trying to dereference it. */
7024 (restore_selected_frame
, &inf_status
->selected_frame_id
,
7025 "Unable to restore previously selected frame:\n",
7026 RETURN_MASK_ERROR
) == 0)
7027 /* Error in restoring the selected frame. Select the innermost
7029 select_frame (get_current_frame ());
7036 do_restore_infcall_control_state_cleanup (void *sts
)
7038 restore_infcall_control_state (sts
);
7042 make_cleanup_restore_infcall_control_state
7043 (struct infcall_control_state
*inf_status
)
7045 return make_cleanup (do_restore_infcall_control_state_cleanup
, inf_status
);
7049 discard_infcall_control_state (struct infcall_control_state
*inf_status
)
7051 if (inf_status
->thread_control
.step_resume_breakpoint
)
7052 inf_status
->thread_control
.step_resume_breakpoint
->disposition
7053 = disp_del_at_next_stop
;
7055 if (inf_status
->thread_control
.exception_resume_breakpoint
)
7056 inf_status
->thread_control
.exception_resume_breakpoint
->disposition
7057 = disp_del_at_next_stop
;
7059 /* See save_infcall_control_state for info on stop_bpstat. */
7060 bpstat_clear (&inf_status
->thread_control
.stop_bpstat
);
7066 ptid_match (ptid_t ptid
, ptid_t filter
)
7068 if (ptid_equal (filter
, minus_one_ptid
))
7070 if (ptid_is_pid (filter
)
7071 && ptid_get_pid (ptid
) == ptid_get_pid (filter
))
7073 else if (ptid_equal (ptid
, filter
))
7079 /* restore_inferior_ptid() will be used by the cleanup machinery
7080 to restore the inferior_ptid value saved in a call to
7081 save_inferior_ptid(). */
7084 restore_inferior_ptid (void *arg
)
7086 ptid_t
*saved_ptid_ptr
= arg
;
7088 inferior_ptid
= *saved_ptid_ptr
;
7092 /* Save the value of inferior_ptid so that it may be restored by a
7093 later call to do_cleanups(). Returns the struct cleanup pointer
7094 needed for later doing the cleanup. */
7097 save_inferior_ptid (void)
7099 ptid_t
*saved_ptid_ptr
;
7101 saved_ptid_ptr
= xmalloc (sizeof (ptid_t
));
7102 *saved_ptid_ptr
= inferior_ptid
;
7103 return make_cleanup (restore_inferior_ptid
, saved_ptid_ptr
);
7106 /* See inferior.h. */
7109 clear_exit_convenience_vars (void)
7111 clear_internalvar (lookup_internalvar ("_exitsignal"));
7112 clear_internalvar (lookup_internalvar ("_exitcode"));
7116 /* User interface for reverse debugging:
7117 Set exec-direction / show exec-direction commands
7118 (returns error unless target implements to_set_exec_direction method). */
7120 int execution_direction
= EXEC_FORWARD
;
7121 static const char exec_forward
[] = "forward";
7122 static const char exec_reverse
[] = "reverse";
7123 static const char *exec_direction
= exec_forward
;
7124 static const char *const exec_direction_names
[] = {
7131 set_exec_direction_func (char *args
, int from_tty
,
7132 struct cmd_list_element
*cmd
)
7134 if (target_can_execute_reverse
)
7136 if (!strcmp (exec_direction
, exec_forward
))
7137 execution_direction
= EXEC_FORWARD
;
7138 else if (!strcmp (exec_direction
, exec_reverse
))
7139 execution_direction
= EXEC_REVERSE
;
7143 exec_direction
= exec_forward
;
7144 error (_("Target does not support this operation."));
7149 show_exec_direction_func (struct ui_file
*out
, int from_tty
,
7150 struct cmd_list_element
*cmd
, const char *value
)
7152 switch (execution_direction
) {
7154 fprintf_filtered (out
, _("Forward.\n"));
7157 fprintf_filtered (out
, _("Reverse.\n"));
7160 internal_error (__FILE__
, __LINE__
,
7161 _("bogus execution_direction value: %d"),
7162 (int) execution_direction
);
7167 show_schedule_multiple (struct ui_file
*file
, int from_tty
,
7168 struct cmd_list_element
*c
, const char *value
)
7170 fprintf_filtered (file
, _("Resuming the execution of threads "
7171 "of all processes is %s.\n"), value
);
7174 /* Implementation of `siginfo' variable. */
7176 static const struct internalvar_funcs siginfo_funcs
=
7184 _initialize_infrun (void)
7188 struct cmd_list_element
*c
;
7190 add_info ("signals", signals_info
, _("\
7191 What debugger does when program gets various signals.\n\
7192 Specify a signal as argument to print info on that signal only."));
7193 add_info_alias ("handle", "signals", 0);
7195 c
= add_com ("handle", class_run
, handle_command
, _("\
7196 Specify how to handle signals.\n\
7197 Usage: handle SIGNAL [ACTIONS]\n\
7198 Args are signals and actions to apply to those signals.\n\
7199 If no actions are specified, the current settings for the specified signals\n\
7200 will be displayed instead.\n\
7202 Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\
7203 from 1-15 are allowed for compatibility with old versions of GDB.\n\
7204 Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\
7205 The special arg \"all\" is recognized to mean all signals except those\n\
7206 used by the debugger, typically SIGTRAP and SIGINT.\n\
7208 Recognized actions include \"stop\", \"nostop\", \"print\", \"noprint\",\n\
7209 \"pass\", \"nopass\", \"ignore\", or \"noignore\".\n\
7210 Stop means reenter debugger if this signal happens (implies print).\n\
7211 Print means print a message if this signal happens.\n\
7212 Pass means let program see this signal; otherwise program doesn't know.\n\
7213 Ignore is a synonym for nopass and noignore is a synonym for pass.\n\
7214 Pass and Stop may be combined.\n\
7216 Multiple signals may be specified. Signal numbers and signal names\n\
7217 may be interspersed with actions, with the actions being performed for\n\
7218 all signals cumulatively specified."));
7219 set_cmd_completer (c
, handle_completer
);
7223 add_com ("lz", class_info
, signals_info
, _("\
7224 What debugger does when program gets various signals.\n\
7225 Specify a signal as argument to print info on that signal only."));
7226 add_com ("z", class_run
, xdb_handle_command
, _("\
7227 Specify how to handle a signal.\n\
7228 Args are signals and actions to apply to those signals.\n\
7229 Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\
7230 from 1-15 are allowed for compatibility with old versions of GDB.\n\
7231 Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\
7232 The special arg \"all\" is recognized to mean all signals except those\n\
7233 used by the debugger, typically SIGTRAP and SIGINT.\n\
7234 Recognized actions include \"s\" (toggles between stop and nostop),\n\
7235 \"r\" (toggles between print and noprint), \"i\" (toggles between pass and \
7236 nopass), \"Q\" (noprint)\n\
7237 Stop means reenter debugger if this signal happens (implies print).\n\
7238 Print means print a message if this signal happens.\n\
7239 Pass means let program see this signal; otherwise program doesn't know.\n\
7240 Ignore is a synonym for nopass and noignore is a synonym for pass.\n\
7241 Pass and Stop may be combined."));
7245 stop_command
= add_cmd ("stop", class_obscure
,
7246 not_just_help_class_command
, _("\
7247 There is no `stop' command, but you can set a hook on `stop'.\n\
7248 This allows you to set a list of commands to be run each time execution\n\
7249 of the program stops."), &cmdlist
);
7251 add_setshow_zuinteger_cmd ("infrun", class_maintenance
, &debug_infrun
, _("\
7252 Set inferior debugging."), _("\
7253 Show inferior debugging."), _("\
7254 When non-zero, inferior specific debugging is enabled."),
7257 &setdebuglist
, &showdebuglist
);
7259 add_setshow_boolean_cmd ("displaced", class_maintenance
,
7260 &debug_displaced
, _("\
7261 Set displaced stepping debugging."), _("\
7262 Show displaced stepping debugging."), _("\
7263 When non-zero, displaced stepping specific debugging is enabled."),
7265 show_debug_displaced
,
7266 &setdebuglist
, &showdebuglist
);
7268 add_setshow_boolean_cmd ("non-stop", no_class
,
7270 Set whether gdb controls the inferior in non-stop mode."), _("\
7271 Show whether gdb controls the inferior in non-stop mode."), _("\
7272 When debugging a multi-threaded program and this setting is\n\
7273 off (the default, also called all-stop mode), when one thread stops\n\
7274 (for a breakpoint, watchpoint, exception, or similar events), GDB stops\n\
7275 all other threads in the program while you interact with the thread of\n\
7276 interest. When you continue or step a thread, you can allow the other\n\
7277 threads to run, or have them remain stopped, but while you inspect any\n\
7278 thread's state, all threads stop.\n\
7280 In non-stop mode, when one thread stops, other threads can continue\n\
7281 to run freely. You'll be able to step each thread independently,\n\
7282 leave it stopped or free to run as needed."),
7288 numsigs
= (int) GDB_SIGNAL_LAST
;
7289 signal_stop
= (unsigned char *) xmalloc (sizeof (signal_stop
[0]) * numsigs
);
7290 signal_print
= (unsigned char *)
7291 xmalloc (sizeof (signal_print
[0]) * numsigs
);
7292 signal_program
= (unsigned char *)
7293 xmalloc (sizeof (signal_program
[0]) * numsigs
);
7294 signal_catch
= (unsigned char *)
7295 xmalloc (sizeof (signal_catch
[0]) * numsigs
);
7296 signal_pass
= (unsigned char *)
7297 xmalloc (sizeof (signal_program
[0]) * numsigs
);
7298 for (i
= 0; i
< numsigs
; i
++)
7301 signal_print
[i
] = 1;
7302 signal_program
[i
] = 1;
7303 signal_catch
[i
] = 0;
7306 /* Signals caused by debugger's own actions
7307 should not be given to the program afterwards. */
7308 signal_program
[GDB_SIGNAL_TRAP
] = 0;
7309 signal_program
[GDB_SIGNAL_INT
] = 0;
7311 /* Signals that are not errors should not normally enter the debugger. */
7312 signal_stop
[GDB_SIGNAL_ALRM
] = 0;
7313 signal_print
[GDB_SIGNAL_ALRM
] = 0;
7314 signal_stop
[GDB_SIGNAL_VTALRM
] = 0;
7315 signal_print
[GDB_SIGNAL_VTALRM
] = 0;
7316 signal_stop
[GDB_SIGNAL_PROF
] = 0;
7317 signal_print
[GDB_SIGNAL_PROF
] = 0;
7318 signal_stop
[GDB_SIGNAL_CHLD
] = 0;
7319 signal_print
[GDB_SIGNAL_CHLD
] = 0;
7320 signal_stop
[GDB_SIGNAL_IO
] = 0;
7321 signal_print
[GDB_SIGNAL_IO
] = 0;
7322 signal_stop
[GDB_SIGNAL_POLL
] = 0;
7323 signal_print
[GDB_SIGNAL_POLL
] = 0;
7324 signal_stop
[GDB_SIGNAL_URG
] = 0;
7325 signal_print
[GDB_SIGNAL_URG
] = 0;
7326 signal_stop
[GDB_SIGNAL_WINCH
] = 0;
7327 signal_print
[GDB_SIGNAL_WINCH
] = 0;
7328 signal_stop
[GDB_SIGNAL_PRIO
] = 0;
7329 signal_print
[GDB_SIGNAL_PRIO
] = 0;
7331 /* These signals are used internally by user-level thread
7332 implementations. (See signal(5) on Solaris.) Like the above
7333 signals, a healthy program receives and handles them as part of
7334 its normal operation. */
7335 signal_stop
[GDB_SIGNAL_LWP
] = 0;
7336 signal_print
[GDB_SIGNAL_LWP
] = 0;
7337 signal_stop
[GDB_SIGNAL_WAITING
] = 0;
7338 signal_print
[GDB_SIGNAL_WAITING
] = 0;
7339 signal_stop
[GDB_SIGNAL_CANCEL
] = 0;
7340 signal_print
[GDB_SIGNAL_CANCEL
] = 0;
7342 /* Update cached state. */
7343 signal_cache_update (-1);
7345 add_setshow_zinteger_cmd ("stop-on-solib-events", class_support
,
7346 &stop_on_solib_events
, _("\
7347 Set stopping for shared library events."), _("\
7348 Show stopping for shared library events."), _("\
7349 If nonzero, gdb will give control to the user when the dynamic linker\n\
7350 notifies gdb of shared library events. The most common event of interest\n\
7351 to the user would be loading/unloading of a new library."),
7352 set_stop_on_solib_events
,
7353 show_stop_on_solib_events
,
7354 &setlist
, &showlist
);
7356 add_setshow_enum_cmd ("follow-fork-mode", class_run
,
7357 follow_fork_mode_kind_names
,
7358 &follow_fork_mode_string
, _("\
7359 Set debugger response to a program call of fork or vfork."), _("\
7360 Show debugger response to a program call of fork or vfork."), _("\
7361 A fork or vfork creates a new process. follow-fork-mode can be:\n\
7362 parent - the original process is debugged after a fork\n\
7363 child - the new process is debugged after a fork\n\
7364 The unfollowed process will continue to run.\n\
7365 By default, the debugger will follow the parent process."),
7367 show_follow_fork_mode_string
,
7368 &setlist
, &showlist
);
7370 add_setshow_enum_cmd ("follow-exec-mode", class_run
,
7371 follow_exec_mode_names
,
7372 &follow_exec_mode_string
, _("\
7373 Set debugger response to a program call of exec."), _("\
7374 Show debugger response to a program call of exec."), _("\
7375 An exec call replaces the program image of a process.\n\
7377 follow-exec-mode can be:\n\
7379 new - the debugger creates a new inferior and rebinds the process\n\
7380 to this new inferior. The program the process was running before\n\
7381 the exec call can be restarted afterwards by restarting the original\n\
7384 same - the debugger keeps the process bound to the same inferior.\n\
7385 The new executable image replaces the previous executable loaded in\n\
7386 the inferior. Restarting the inferior after the exec call restarts\n\
7387 the executable the process was running after the exec call.\n\
7389 By default, the debugger will use the same inferior."),
7391 show_follow_exec_mode_string
,
7392 &setlist
, &showlist
);
7394 add_setshow_enum_cmd ("scheduler-locking", class_run
,
7395 scheduler_enums
, &scheduler_mode
, _("\
7396 Set mode for locking scheduler during execution."), _("\
7397 Show mode for locking scheduler during execution."), _("\
7398 off == no locking (threads may preempt at any time)\n\
7399 on == full locking (no thread except the current thread may run)\n\
7400 step == scheduler locked during every single-step operation.\n\
7401 In this mode, no other thread may run during a step command.\n\
7402 Other threads may run while stepping over a function call ('next')."),
7403 set_schedlock_func
, /* traps on target vector */
7404 show_scheduler_mode
,
7405 &setlist
, &showlist
);
7407 add_setshow_boolean_cmd ("schedule-multiple", class_run
, &sched_multi
, _("\
7408 Set mode for resuming threads of all processes."), _("\
7409 Show mode for resuming threads of all processes."), _("\
7410 When on, execution commands (such as 'continue' or 'next') resume all\n\
7411 threads of all processes. When off (which is the default), execution\n\
7412 commands only resume the threads of the current process. The set of\n\
7413 threads that are resumed is further refined by the scheduler-locking\n\
7414 mode (see help set scheduler-locking)."),
7416 show_schedule_multiple
,
7417 &setlist
, &showlist
);
7419 add_setshow_boolean_cmd ("step-mode", class_run
, &step_stop_if_no_debug
, _("\
7420 Set mode of the step operation."), _("\
7421 Show mode of the step operation."), _("\
7422 When set, doing a step over a function without debug line information\n\
7423 will stop at the first instruction of that function. Otherwise, the\n\
7424 function is skipped and the step command stops at a different source line."),
7426 show_step_stop_if_no_debug
,
7427 &setlist
, &showlist
);
7429 add_setshow_auto_boolean_cmd ("displaced-stepping", class_run
,
7430 &can_use_displaced_stepping
, _("\
7431 Set debugger's willingness to use displaced stepping."), _("\
7432 Show debugger's willingness to use displaced stepping."), _("\
7433 If on, gdb will use displaced stepping to step over breakpoints if it is\n\
7434 supported by the target architecture. If off, gdb will not use displaced\n\
7435 stepping to step over breakpoints, even if such is supported by the target\n\
7436 architecture. If auto (which is the default), gdb will use displaced stepping\n\
7437 if the target architecture supports it and non-stop mode is active, but will not\n\
7438 use it in all-stop mode (see help set non-stop)."),
7440 show_can_use_displaced_stepping
,
7441 &setlist
, &showlist
);
7443 add_setshow_enum_cmd ("exec-direction", class_run
, exec_direction_names
,
7444 &exec_direction
, _("Set direction of execution.\n\
7445 Options are 'forward' or 'reverse'."),
7446 _("Show direction of execution (forward/reverse)."),
7447 _("Tells gdb whether to execute forward or backward."),
7448 set_exec_direction_func
, show_exec_direction_func
,
7449 &setlist
, &showlist
);
7451 /* Set/show detach-on-fork: user-settable mode. */
7453 add_setshow_boolean_cmd ("detach-on-fork", class_run
, &detach_fork
, _("\
7454 Set whether gdb will detach the child of a fork."), _("\
7455 Show whether gdb will detach the child of a fork."), _("\
7456 Tells gdb whether to detach the child of a fork."),
7457 NULL
, NULL
, &setlist
, &showlist
);
7459 /* Set/show disable address space randomization mode. */
7461 add_setshow_boolean_cmd ("disable-randomization", class_support
,
7462 &disable_randomization
, _("\
7463 Set disabling of debuggee's virtual address space randomization."), _("\
7464 Show disabling of debuggee's virtual address space randomization."), _("\
7465 When this mode is on (which is the default), randomization of the virtual\n\
7466 address space is disabled. Standalone programs run with the randomization\n\
7467 enabled by default on some platforms."),
7468 &set_disable_randomization
,
7469 &show_disable_randomization
,
7470 &setlist
, &showlist
);
7472 /* ptid initializations */
7473 inferior_ptid
= null_ptid
;
7474 target_last_wait_ptid
= minus_one_ptid
;
7476 observer_attach_thread_ptid_changed (infrun_thread_ptid_changed
);
7477 observer_attach_thread_stop_requested (infrun_thread_stop_requested
);
7478 observer_attach_thread_exit (infrun_thread_thread_exit
);
7479 observer_attach_inferior_exit (infrun_inferior_exit
);
7481 /* Explicitly create without lookup, since that tries to create a
7482 value with a void typed value, and when we get here, gdbarch
7483 isn't initialized yet. At this point, we're quite sure there
7484 isn't another convenience variable of the same name. */
7485 create_internalvar_type_lazy ("_siginfo", &siginfo_funcs
, NULL
);
7487 add_setshow_boolean_cmd ("observer", no_class
,
7488 &observer_mode_1
, _("\
7489 Set whether gdb controls the inferior in observer mode."), _("\
7490 Show whether gdb controls the inferior in observer mode."), _("\
7491 In observer mode, GDB can get data from the inferior, but not\n\
7492 affect its execution. Registers and memory may not be changed,\n\
7493 breakpoints may not be set, and the program cannot be interrupted\n\