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=%s), "
1753 "trap_expected=%d, current thread [%s] at %s\n",
1754 step
, gdb_signal_to_symbol_string (sig
),
1755 tp
->control
.trap_expected
,
1756 target_pid_to_str (inferior_ptid
),
1757 paddress (gdbarch
, pc
));
1759 /* Normally, by the time we reach `resume', the breakpoints are either
1760 removed or inserted, as appropriate. The exception is if we're sitting
1761 at a permanent breakpoint; we need to step over it, but permanent
1762 breakpoints can't be removed. So we have to test for it here. */
1763 if (breakpoint_here_p (aspace
, pc
) == permanent_breakpoint_here
)
1765 if (gdbarch_skip_permanent_breakpoint_p (gdbarch
))
1766 gdbarch_skip_permanent_breakpoint (gdbarch
, regcache
);
1769 The program is stopped at a permanent breakpoint, but GDB does not know\n\
1770 how to step past a permanent breakpoint on this architecture. Try using\n\
1771 a command like `return' or `jump' to continue execution."));
1774 /* If we have a breakpoint to step over, make sure to do a single
1775 step only. Same if we have software watchpoints. */
1776 if (tp
->control
.trap_expected
|| bpstat_should_step ())
1777 tp
->control
.may_range_step
= 0;
1779 /* If enabled, step over breakpoints by executing a copy of the
1780 instruction at a different address.
1782 We can't use displaced stepping when we have a signal to deliver;
1783 the comments for displaced_step_prepare explain why. The
1784 comments in the handle_inferior event for dealing with 'random
1785 signals' explain what we do instead.
1787 We can't use displaced stepping when we are waiting for vfork_done
1788 event, displaced stepping breaks the vfork child similarly as single
1789 step software breakpoint. */
1790 if (use_displaced_stepping (gdbarch
)
1791 && (tp
->control
.trap_expected
1792 || (step
&& gdbarch_software_single_step_p (gdbarch
)))
1793 && sig
== GDB_SIGNAL_0
1794 && !current_inferior ()->waiting_for_vfork_done
)
1796 struct displaced_step_inferior_state
*displaced
;
1798 if (!displaced_step_prepare (inferior_ptid
))
1800 /* Got placed in displaced stepping queue. Will be resumed
1801 later when all the currently queued displaced stepping
1802 requests finish. The thread is not executing at this point,
1803 and the call to set_executing will be made later. But we
1804 need to call set_running here, since from frontend point of view,
1805 the thread is running. */
1806 set_running (inferior_ptid
, 1);
1807 discard_cleanups (old_cleanups
);
1811 /* Update pc to reflect the new address from which we will execute
1812 instructions due to displaced stepping. */
1813 pc
= regcache_read_pc (get_thread_regcache (inferior_ptid
));
1815 displaced
= get_displaced_stepping_state (ptid_get_pid (inferior_ptid
));
1816 step
= gdbarch_displaced_step_hw_singlestep (gdbarch
,
1817 displaced
->step_closure
);
1820 /* Do we need to do it the hard way, w/temp breakpoints? */
1822 step
= maybe_software_singlestep (gdbarch
, pc
);
1824 /* Currently, our software single-step implementation leads to different
1825 results than hardware single-stepping in one situation: when stepping
1826 into delivering a signal which has an associated signal handler,
1827 hardware single-step will stop at the first instruction of the handler,
1828 while software single-step will simply skip execution of the handler.
1830 For now, this difference in behavior is accepted since there is no
1831 easy way to actually implement single-stepping into a signal handler
1832 without kernel support.
1834 However, there is one scenario where this difference leads to follow-on
1835 problems: if we're stepping off a breakpoint by removing all breakpoints
1836 and then single-stepping. In this case, the software single-step
1837 behavior means that even if there is a *breakpoint* in the signal
1838 handler, GDB still would not stop.
1840 Fortunately, we can at least fix this particular issue. We detect
1841 here the case where we are about to deliver a signal while software
1842 single-stepping with breakpoints removed. In this situation, we
1843 revert the decisions to remove all breakpoints and insert single-
1844 step breakpoints, and instead we install a step-resume breakpoint
1845 at the current address, deliver the signal without stepping, and
1846 once we arrive back at the step-resume breakpoint, actually step
1847 over the breakpoint we originally wanted to step over. */
1848 if (singlestep_breakpoints_inserted_p
1849 && tp
->control
.trap_expected
&& sig
!= GDB_SIGNAL_0
)
1851 /* If we have nested signals or a pending signal is delivered
1852 immediately after a handler returns, might might already have
1853 a step-resume breakpoint set on the earlier handler. We cannot
1854 set another step-resume breakpoint; just continue on until the
1855 original breakpoint is hit. */
1856 if (tp
->control
.step_resume_breakpoint
== NULL
)
1858 insert_hp_step_resume_breakpoint_at_frame (get_current_frame ());
1859 tp
->step_after_step_resume_breakpoint
= 1;
1862 remove_single_step_breakpoints ();
1863 singlestep_breakpoints_inserted_p
= 0;
1865 insert_breakpoints ();
1866 tp
->control
.trap_expected
= 0;
1873 /* If STEP is set, it's a request to use hardware stepping
1874 facilities. But in that case, we should never
1875 use singlestep breakpoint. */
1876 gdb_assert (!(singlestep_breakpoints_inserted_p
&& step
));
1878 /* Decide the set of threads to ask the target to resume. Start
1879 by assuming everything will be resumed, than narrow the set
1880 by applying increasingly restricting conditions. */
1881 resume_ptid
= user_visible_resume_ptid (step
);
1883 /* Maybe resume a single thread after all. */
1884 if (singlestep_breakpoints_inserted_p
1885 && stepping_past_singlestep_breakpoint
)
1887 /* The situation here is as follows. In thread T1 we wanted to
1888 single-step. Lacking hardware single-stepping we've
1889 set breakpoint at the PC of the next instruction -- call it
1890 P. After resuming, we've hit that breakpoint in thread T2.
1891 Now we've removed original breakpoint, inserted breakpoint
1892 at P+1, and try to step to advance T2 past breakpoint.
1893 We need to step only T2, as if T1 is allowed to freely run,
1894 it can run past P, and if other threads are allowed to run,
1895 they can hit breakpoint at P+1, and nested hits of single-step
1896 breakpoints is not something we'd want -- that's complicated
1897 to support, and has no value. */
1898 resume_ptid
= inferior_ptid
;
1900 else if ((step
|| singlestep_breakpoints_inserted_p
)
1901 && tp
->control
.trap_expected
)
1903 /* We're allowing a thread to run past a breakpoint it has
1904 hit, by single-stepping the thread with the breakpoint
1905 removed. In which case, we need to single-step only this
1906 thread, and keep others stopped, as they can miss this
1907 breakpoint if allowed to run.
1909 The current code actually removes all breakpoints when
1910 doing this, not just the one being stepped over, so if we
1911 let other threads run, we can actually miss any
1912 breakpoint, not just the one at PC. */
1913 resume_ptid
= inferior_ptid
;
1916 if (gdbarch_cannot_step_breakpoint (gdbarch
))
1918 /* Most targets can step a breakpoint instruction, thus
1919 executing it normally. But if this one cannot, just
1920 continue and we will hit it anyway. */
1921 if (step
&& breakpoint_inserted_here_p (aspace
, pc
))
1926 && use_displaced_stepping (gdbarch
)
1927 && tp
->control
.trap_expected
)
1929 struct regcache
*resume_regcache
= get_thread_regcache (resume_ptid
);
1930 struct gdbarch
*resume_gdbarch
= get_regcache_arch (resume_regcache
);
1931 CORE_ADDR actual_pc
= regcache_read_pc (resume_regcache
);
1934 fprintf_unfiltered (gdb_stdlog
, "displaced: run %s: ",
1935 paddress (resume_gdbarch
, actual_pc
));
1936 read_memory (actual_pc
, buf
, sizeof (buf
));
1937 displaced_step_dump_bytes (gdb_stdlog
, buf
, sizeof (buf
));
1940 if (tp
->control
.may_range_step
)
1942 /* If we're resuming a thread with the PC out of the step
1943 range, then we're doing some nested/finer run control
1944 operation, like stepping the thread out of the dynamic
1945 linker or the displaced stepping scratch pad. We
1946 shouldn't have allowed a range step then. */
1947 gdb_assert (pc_in_thread_step_range (pc
, tp
));
1950 /* Install inferior's terminal modes. */
1951 target_terminal_inferior ();
1953 /* Avoid confusing the next resume, if the next stop/resume
1954 happens to apply to another thread. */
1955 tp
->suspend
.stop_signal
= GDB_SIGNAL_0
;
1957 /* Advise target which signals may be handled silently. If we have
1958 removed breakpoints because we are stepping over one (which can
1959 happen only if we are not using displaced stepping), we need to
1960 receive all signals to avoid accidentally skipping a breakpoint
1961 during execution of a signal handler. */
1962 if ((step
|| singlestep_breakpoints_inserted_p
)
1963 && tp
->control
.trap_expected
1964 && !use_displaced_stepping (gdbarch
))
1965 target_pass_signals (0, NULL
);
1967 target_pass_signals ((int) GDB_SIGNAL_LAST
, signal_pass
);
1969 target_resume (resume_ptid
, step
, sig
);
1972 discard_cleanups (old_cleanups
);
1977 /* Clear out all variables saying what to do when inferior is continued.
1978 First do this, then set the ones you want, then call `proceed'. */
1981 clear_proceed_status_thread (struct thread_info
*tp
)
1984 fprintf_unfiltered (gdb_stdlog
,
1985 "infrun: clear_proceed_status_thread (%s)\n",
1986 target_pid_to_str (tp
->ptid
));
1988 tp
->control
.trap_expected
= 0;
1989 tp
->control
.step_range_start
= 0;
1990 tp
->control
.step_range_end
= 0;
1991 tp
->control
.may_range_step
= 0;
1992 tp
->control
.step_frame_id
= null_frame_id
;
1993 tp
->control
.step_stack_frame_id
= null_frame_id
;
1994 tp
->control
.step_over_calls
= STEP_OVER_UNDEBUGGABLE
;
1995 tp
->stop_requested
= 0;
1997 tp
->control
.stop_step
= 0;
1999 tp
->control
.proceed_to_finish
= 0;
2001 /* Discard any remaining commands or status from previous stop. */
2002 bpstat_clear (&tp
->control
.stop_bpstat
);
2006 clear_proceed_status_callback (struct thread_info
*tp
, void *data
)
2008 if (is_exited (tp
->ptid
))
2011 clear_proceed_status_thread (tp
);
2016 clear_proceed_status (void)
2020 /* In all-stop mode, delete the per-thread status of all
2021 threads, even if inferior_ptid is null_ptid, there may be
2022 threads on the list. E.g., we may be launching a new
2023 process, while selecting the executable. */
2024 iterate_over_threads (clear_proceed_status_callback
, NULL
);
2027 if (!ptid_equal (inferior_ptid
, null_ptid
))
2029 struct inferior
*inferior
;
2033 /* If in non-stop mode, only delete the per-thread status of
2034 the current thread. */
2035 clear_proceed_status_thread (inferior_thread ());
2038 inferior
= current_inferior ();
2039 inferior
->control
.stop_soon
= NO_STOP_QUIETLY
;
2042 stop_after_trap
= 0;
2044 observer_notify_about_to_proceed ();
2048 regcache_xfree (stop_registers
);
2049 stop_registers
= NULL
;
2053 /* Check the current thread against the thread that reported the most recent
2054 event. If a step-over is required return TRUE and set the current thread
2055 to the old thread. Otherwise return FALSE.
2057 This should be suitable for any targets that support threads. */
2060 prepare_to_proceed (int step
)
2063 struct target_waitstatus wait_status
;
2064 int schedlock_enabled
;
2066 /* With non-stop mode on, threads are always handled individually. */
2067 gdb_assert (! non_stop
);
2069 /* Get the last target status returned by target_wait(). */
2070 get_last_target_status (&wait_ptid
, &wait_status
);
2072 /* Make sure we were stopped at a breakpoint. */
2073 if (wait_status
.kind
!= TARGET_WAITKIND_STOPPED
2074 || (wait_status
.value
.sig
!= GDB_SIGNAL_TRAP
2075 && wait_status
.value
.sig
!= GDB_SIGNAL_ILL
2076 && wait_status
.value
.sig
!= GDB_SIGNAL_SEGV
2077 && wait_status
.value
.sig
!= GDB_SIGNAL_EMT
))
2082 schedlock_enabled
= (scheduler_mode
== schedlock_on
2083 || (scheduler_mode
== schedlock_step
2086 /* Don't switch over to WAIT_PTID if scheduler locking is on. */
2087 if (schedlock_enabled
)
2090 /* Don't switch over if we're about to resume some other process
2091 other than WAIT_PTID's, and schedule-multiple is off. */
2093 && ptid_get_pid (wait_ptid
) != ptid_get_pid (inferior_ptid
))
2096 /* Switched over from WAIT_PID. */
2097 if (!ptid_equal (wait_ptid
, minus_one_ptid
)
2098 && !ptid_equal (inferior_ptid
, wait_ptid
))
2100 struct regcache
*regcache
= get_thread_regcache (wait_ptid
);
2102 if (breakpoint_here_p (get_regcache_aspace (regcache
),
2103 regcache_read_pc (regcache
)))
2105 /* If stepping, remember current thread to switch back to. */
2107 deferred_step_ptid
= inferior_ptid
;
2109 /* Switch back to WAIT_PID thread. */
2110 switch_to_thread (wait_ptid
);
2113 fprintf_unfiltered (gdb_stdlog
,
2114 "infrun: prepare_to_proceed (step=%d), "
2115 "switched to [%s]\n",
2116 step
, target_pid_to_str (inferior_ptid
));
2118 /* We return 1 to indicate that there is a breakpoint here,
2119 so we need to step over it before continuing to avoid
2120 hitting it straight away. */
2128 /* Basic routine for continuing the program in various fashions.
2130 ADDR is the address to resume at, or -1 for resume where stopped.
2131 SIGGNAL is the signal to give it, or 0 for none,
2132 or -1 for act according to how it stopped.
2133 STEP is nonzero if should trap after one instruction.
2134 -1 means return after that and print nothing.
2135 You should probably set various step_... variables
2136 before calling here, if you are stepping.
2138 You should call clear_proceed_status before calling proceed. */
2141 proceed (CORE_ADDR addr
, enum gdb_signal siggnal
, int step
)
2143 struct regcache
*regcache
;
2144 struct gdbarch
*gdbarch
;
2145 struct thread_info
*tp
;
2147 struct address_space
*aspace
;
2148 /* GDB may force the inferior to step due to various reasons. */
2151 /* If we're stopped at a fork/vfork, follow the branch set by the
2152 "set follow-fork-mode" command; otherwise, we'll just proceed
2153 resuming the current thread. */
2154 if (!follow_fork ())
2156 /* The target for some reason decided not to resume. */
2158 if (target_can_async_p ())
2159 inferior_event_handler (INF_EXEC_COMPLETE
, NULL
);
2163 /* We'll update this if & when we switch to a new thread. */
2164 previous_inferior_ptid
= inferior_ptid
;
2166 regcache
= get_current_regcache ();
2167 gdbarch
= get_regcache_arch (regcache
);
2168 aspace
= get_regcache_aspace (regcache
);
2169 pc
= regcache_read_pc (regcache
);
2172 step_start_function
= find_pc_function (pc
);
2174 stop_after_trap
= 1;
2176 if (addr
== (CORE_ADDR
) -1)
2178 if (pc
== stop_pc
&& breakpoint_here_p (aspace
, pc
)
2179 && execution_direction
!= EXEC_REVERSE
)
2180 /* There is a breakpoint at the address we will resume at,
2181 step one instruction before inserting breakpoints so that
2182 we do not stop right away (and report a second hit at this
2185 Note, we don't do this in reverse, because we won't
2186 actually be executing the breakpoint insn anyway.
2187 We'll be (un-)executing the previous instruction. */
2190 else if (gdbarch_single_step_through_delay_p (gdbarch
)
2191 && gdbarch_single_step_through_delay (gdbarch
,
2192 get_current_frame ()))
2193 /* We stepped onto an instruction that needs to be stepped
2194 again before re-inserting the breakpoint, do so. */
2199 regcache_write_pc (regcache
, addr
);
2203 fprintf_unfiltered (gdb_stdlog
,
2204 "infrun: proceed (addr=%s, signal=%s, step=%d)\n",
2205 paddress (gdbarch
, addr
),
2206 gdb_signal_to_symbol_string (siggnal
), step
);
2209 /* In non-stop, each thread is handled individually. The context
2210 must already be set to the right thread here. */
2214 /* In a multi-threaded task we may select another thread and
2215 then continue or step.
2217 But if the old thread was stopped at a breakpoint, it will
2218 immediately cause another breakpoint stop without any
2219 execution (i.e. it will report a breakpoint hit incorrectly).
2220 So we must step over it first.
2222 prepare_to_proceed checks the current thread against the
2223 thread that reported the most recent event. If a step-over
2224 is required it returns TRUE and sets the current thread to
2226 if (prepare_to_proceed (step
))
2230 /* prepare_to_proceed may change the current thread. */
2231 tp
= inferior_thread ();
2235 tp
->control
.trap_expected
= 1;
2236 /* If displaced stepping is enabled, we can step over the
2237 breakpoint without hitting it, so leave all breakpoints
2238 inserted. Otherwise we need to disable all breakpoints, step
2239 one instruction, and then re-add them when that step is
2241 if (!use_displaced_stepping (gdbarch
))
2242 remove_breakpoints ();
2245 /* We can insert breakpoints if we're not trying to step over one,
2246 or if we are stepping over one but we're using displaced stepping
2248 if (! tp
->control
.trap_expected
|| use_displaced_stepping (gdbarch
))
2249 insert_breakpoints ();
2253 /* Pass the last stop signal to the thread we're resuming,
2254 irrespective of whether the current thread is the thread that
2255 got the last event or not. This was historically GDB's
2256 behaviour before keeping a stop_signal per thread. */
2258 struct thread_info
*last_thread
;
2260 struct target_waitstatus last_status
;
2262 get_last_target_status (&last_ptid
, &last_status
);
2263 if (!ptid_equal (inferior_ptid
, last_ptid
)
2264 && !ptid_equal (last_ptid
, null_ptid
)
2265 && !ptid_equal (last_ptid
, minus_one_ptid
))
2267 last_thread
= find_thread_ptid (last_ptid
);
2270 tp
->suspend
.stop_signal
= last_thread
->suspend
.stop_signal
;
2271 last_thread
->suspend
.stop_signal
= GDB_SIGNAL_0
;
2276 if (siggnal
!= GDB_SIGNAL_DEFAULT
)
2277 tp
->suspend
.stop_signal
= siggnal
;
2278 /* If this signal should not be seen by program,
2279 give it zero. Used for debugging signals. */
2280 else if (!signal_program
[tp
->suspend
.stop_signal
])
2281 tp
->suspend
.stop_signal
= GDB_SIGNAL_0
;
2283 annotate_starting ();
2285 /* Make sure that output from GDB appears before output from the
2287 gdb_flush (gdb_stdout
);
2289 /* Refresh prev_pc value just prior to resuming. This used to be
2290 done in stop_stepping, however, setting prev_pc there did not handle
2291 scenarios such as inferior function calls or returning from
2292 a function via the return command. In those cases, the prev_pc
2293 value was not set properly for subsequent commands. The prev_pc value
2294 is used to initialize the starting line number in the ecs. With an
2295 invalid value, the gdb next command ends up stopping at the position
2296 represented by the next line table entry past our start position.
2297 On platforms that generate one line table entry per line, this
2298 is not a problem. However, on the ia64, the compiler generates
2299 extraneous line table entries that do not increase the line number.
2300 When we issue the gdb next command on the ia64 after an inferior call
2301 or a return command, we often end up a few instructions forward, still
2302 within the original line we started.
2304 An attempt was made to refresh the prev_pc at the same time the
2305 execution_control_state is initialized (for instance, just before
2306 waiting for an inferior event). But this approach did not work
2307 because of platforms that use ptrace, where the pc register cannot
2308 be read unless the inferior is stopped. At that point, we are not
2309 guaranteed the inferior is stopped and so the regcache_read_pc() call
2310 can fail. Setting the prev_pc value here ensures the value is updated
2311 correctly when the inferior is stopped. */
2312 tp
->prev_pc
= regcache_read_pc (get_current_regcache ());
2314 /* Fill in with reasonable starting values. */
2315 init_thread_stepping_state (tp
);
2317 /* Reset to normal state. */
2318 init_infwait_state ();
2320 /* Resume inferior. */
2321 resume (force_step
|| step
|| bpstat_should_step (),
2322 tp
->suspend
.stop_signal
);
2324 /* Wait for it to stop (if not standalone)
2325 and in any case decode why it stopped, and act accordingly. */
2326 /* Do this only if we are not using the event loop, or if the target
2327 does not support asynchronous execution. */
2328 if (!target_can_async_p ())
2330 wait_for_inferior ();
2336 /* Start remote-debugging of a machine over a serial link. */
2339 start_remote (int from_tty
)
2341 struct inferior
*inferior
;
2343 inferior
= current_inferior ();
2344 inferior
->control
.stop_soon
= STOP_QUIETLY_REMOTE
;
2346 /* Always go on waiting for the target, regardless of the mode. */
2347 /* FIXME: cagney/1999-09-23: At present it isn't possible to
2348 indicate to wait_for_inferior that a target should timeout if
2349 nothing is returned (instead of just blocking). Because of this,
2350 targets expecting an immediate response need to, internally, set
2351 things up so that the target_wait() is forced to eventually
2353 /* FIXME: cagney/1999-09-24: It isn't possible for target_open() to
2354 differentiate to its caller what the state of the target is after
2355 the initial open has been performed. Here we're assuming that
2356 the target has stopped. It should be possible to eventually have
2357 target_open() return to the caller an indication that the target
2358 is currently running and GDB state should be set to the same as
2359 for an async run. */
2360 wait_for_inferior ();
2362 /* Now that the inferior has stopped, do any bookkeeping like
2363 loading shared libraries. We want to do this before normal_stop,
2364 so that the displayed frame is up to date. */
2365 post_create_inferior (¤t_target
, from_tty
);
2370 /* Initialize static vars when a new inferior begins. */
2373 init_wait_for_inferior (void)
2375 /* These are meaningless until the first time through wait_for_inferior. */
2377 breakpoint_init_inferior (inf_starting
);
2379 clear_proceed_status ();
2381 stepping_past_singlestep_breakpoint
= 0;
2382 deferred_step_ptid
= null_ptid
;
2384 target_last_wait_ptid
= minus_one_ptid
;
2386 previous_inferior_ptid
= inferior_ptid
;
2387 init_infwait_state ();
2389 /* Discard any skipped inlined frames. */
2390 clear_inline_frame_state (minus_one_ptid
);
2394 /* This enum encodes possible reasons for doing a target_wait, so that
2395 wfi can call target_wait in one place. (Ultimately the call will be
2396 moved out of the infinite loop entirely.) */
2400 infwait_normal_state
,
2401 infwait_thread_hop_state
,
2402 infwait_step_watch_state
,
2403 infwait_nonstep_watch_state
2406 /* The PTID we'll do a target_wait on.*/
2409 /* Current inferior wait state. */
2410 static enum infwait_states infwait_state
;
2412 /* Data to be passed around while handling an event. This data is
2413 discarded between events. */
2414 struct execution_control_state
2417 /* The thread that got the event, if this was a thread event; NULL
2419 struct thread_info
*event_thread
;
2421 struct target_waitstatus ws
;
2423 int stop_func_filled_in
;
2424 CORE_ADDR stop_func_start
;
2425 CORE_ADDR stop_func_end
;
2426 const char *stop_func_name
;
2430 static void handle_inferior_event (struct execution_control_state
*ecs
);
2432 static void handle_step_into_function (struct gdbarch
*gdbarch
,
2433 struct execution_control_state
*ecs
);
2434 static void handle_step_into_function_backward (struct gdbarch
*gdbarch
,
2435 struct execution_control_state
*ecs
);
2436 static void check_exception_resume (struct execution_control_state
*,
2437 struct frame_info
*);
2439 static void stop_stepping (struct execution_control_state
*ecs
);
2440 static void prepare_to_wait (struct execution_control_state
*ecs
);
2441 static void keep_going (struct execution_control_state
*ecs
);
2442 static void process_event_stop_test (struct execution_control_state
*ecs
);
2443 static int switch_back_to_stepped_thread (struct execution_control_state
*ecs
);
2445 /* Callback for iterate over threads. If the thread is stopped, but
2446 the user/frontend doesn't know about that yet, go through
2447 normal_stop, as if the thread had just stopped now. ARG points at
2448 a ptid. If PTID is MINUS_ONE_PTID, applies to all threads. If
2449 ptid_is_pid(PTID) is true, applies to all threads of the process
2450 pointed at by PTID. Otherwise, apply only to the thread pointed by
2454 infrun_thread_stop_requested_callback (struct thread_info
*info
, void *arg
)
2456 ptid_t ptid
= * (ptid_t
*) arg
;
2458 if ((ptid_equal (info
->ptid
, ptid
)
2459 || ptid_equal (minus_one_ptid
, ptid
)
2460 || (ptid_is_pid (ptid
)
2461 && ptid_get_pid (ptid
) == ptid_get_pid (info
->ptid
)))
2462 && is_running (info
->ptid
)
2463 && !is_executing (info
->ptid
))
2465 struct cleanup
*old_chain
;
2466 struct execution_control_state ecss
;
2467 struct execution_control_state
*ecs
= &ecss
;
2469 memset (ecs
, 0, sizeof (*ecs
));
2471 old_chain
= make_cleanup_restore_current_thread ();
2473 /* Go through handle_inferior_event/normal_stop, so we always
2474 have consistent output as if the stop event had been
2476 ecs
->ptid
= info
->ptid
;
2477 ecs
->event_thread
= find_thread_ptid (info
->ptid
);
2478 ecs
->ws
.kind
= TARGET_WAITKIND_STOPPED
;
2479 ecs
->ws
.value
.sig
= GDB_SIGNAL_0
;
2481 handle_inferior_event (ecs
);
2483 if (!ecs
->wait_some_more
)
2485 struct thread_info
*tp
;
2489 /* Finish off the continuations. */
2490 tp
= inferior_thread ();
2491 do_all_intermediate_continuations_thread (tp
, 1);
2492 do_all_continuations_thread (tp
, 1);
2495 do_cleanups (old_chain
);
2501 /* This function is attached as a "thread_stop_requested" observer.
2502 Cleanup local state that assumed the PTID was to be resumed, and
2503 report the stop to the frontend. */
2506 infrun_thread_stop_requested (ptid_t ptid
)
2508 struct displaced_step_inferior_state
*displaced
;
2510 /* PTID was requested to stop. Remove it from the displaced
2511 stepping queue, so we don't try to resume it automatically. */
2513 for (displaced
= displaced_step_inferior_states
;
2515 displaced
= displaced
->next
)
2517 struct displaced_step_request
*it
, **prev_next_p
;
2519 it
= displaced
->step_request_queue
;
2520 prev_next_p
= &displaced
->step_request_queue
;
2523 if (ptid_match (it
->ptid
, ptid
))
2525 *prev_next_p
= it
->next
;
2531 prev_next_p
= &it
->next
;
2538 iterate_over_threads (infrun_thread_stop_requested_callback
, &ptid
);
2542 infrun_thread_thread_exit (struct thread_info
*tp
, int silent
)
2544 if (ptid_equal (target_last_wait_ptid
, tp
->ptid
))
2545 nullify_last_target_wait_ptid ();
2548 /* Callback for iterate_over_threads. */
2551 delete_step_resume_breakpoint_callback (struct thread_info
*info
, void *data
)
2553 if (is_exited (info
->ptid
))
2556 delete_step_resume_breakpoint (info
);
2557 delete_exception_resume_breakpoint (info
);
2561 /* In all-stop, delete the step resume breakpoint of any thread that
2562 had one. In non-stop, delete the step resume breakpoint of the
2563 thread that just stopped. */
2566 delete_step_thread_step_resume_breakpoint (void)
2568 if (!target_has_execution
2569 || ptid_equal (inferior_ptid
, null_ptid
))
2570 /* If the inferior has exited, we have already deleted the step
2571 resume breakpoints out of GDB's lists. */
2576 /* If in non-stop mode, only delete the step-resume or
2577 longjmp-resume breakpoint of the thread that just stopped
2579 struct thread_info
*tp
= inferior_thread ();
2581 delete_step_resume_breakpoint (tp
);
2582 delete_exception_resume_breakpoint (tp
);
2585 /* In all-stop mode, delete all step-resume and longjmp-resume
2586 breakpoints of any thread that had them. */
2587 iterate_over_threads (delete_step_resume_breakpoint_callback
, NULL
);
2590 /* A cleanup wrapper. */
2593 delete_step_thread_step_resume_breakpoint_cleanup (void *arg
)
2595 delete_step_thread_step_resume_breakpoint ();
2598 /* Pretty print the results of target_wait, for debugging purposes. */
2601 print_target_wait_results (ptid_t waiton_ptid
, ptid_t result_ptid
,
2602 const struct target_waitstatus
*ws
)
2604 char *status_string
= target_waitstatus_to_string (ws
);
2605 struct ui_file
*tmp_stream
= mem_fileopen ();
2608 /* The text is split over several lines because it was getting too long.
2609 Call fprintf_unfiltered (gdb_stdlog) once so that the text is still
2610 output as a unit; we want only one timestamp printed if debug_timestamp
2613 fprintf_unfiltered (tmp_stream
,
2614 "infrun: target_wait (%d", ptid_get_pid (waiton_ptid
));
2615 if (ptid_get_pid (waiton_ptid
) != -1)
2616 fprintf_unfiltered (tmp_stream
,
2617 " [%s]", target_pid_to_str (waiton_ptid
));
2618 fprintf_unfiltered (tmp_stream
, ", status) =\n");
2619 fprintf_unfiltered (tmp_stream
,
2620 "infrun: %d [%s],\n",
2621 ptid_get_pid (result_ptid
),
2622 target_pid_to_str (result_ptid
));
2623 fprintf_unfiltered (tmp_stream
,
2627 text
= ui_file_xstrdup (tmp_stream
, NULL
);
2629 /* This uses %s in part to handle %'s in the text, but also to avoid
2630 a gcc error: the format attribute requires a string literal. */
2631 fprintf_unfiltered (gdb_stdlog
, "%s", text
);
2633 xfree (status_string
);
2635 ui_file_delete (tmp_stream
);
2638 /* Prepare and stabilize the inferior for detaching it. E.g.,
2639 detaching while a thread is displaced stepping is a recipe for
2640 crashing it, as nothing would readjust the PC out of the scratch
2644 prepare_for_detach (void)
2646 struct inferior
*inf
= current_inferior ();
2647 ptid_t pid_ptid
= pid_to_ptid (inf
->pid
);
2648 struct cleanup
*old_chain_1
;
2649 struct displaced_step_inferior_state
*displaced
;
2651 displaced
= get_displaced_stepping_state (inf
->pid
);
2653 /* Is any thread of this process displaced stepping? If not,
2654 there's nothing else to do. */
2655 if (displaced
== NULL
|| ptid_equal (displaced
->step_ptid
, null_ptid
))
2659 fprintf_unfiltered (gdb_stdlog
,
2660 "displaced-stepping in-process while detaching");
2662 old_chain_1
= make_cleanup_restore_integer (&inf
->detaching
);
2665 while (!ptid_equal (displaced
->step_ptid
, null_ptid
))
2667 struct cleanup
*old_chain_2
;
2668 struct execution_control_state ecss
;
2669 struct execution_control_state
*ecs
;
2672 memset (ecs
, 0, sizeof (*ecs
));
2674 overlay_cache_invalid
= 1;
2676 if (deprecated_target_wait_hook
)
2677 ecs
->ptid
= deprecated_target_wait_hook (pid_ptid
, &ecs
->ws
, 0);
2679 ecs
->ptid
= target_wait (pid_ptid
, &ecs
->ws
, 0);
2682 print_target_wait_results (pid_ptid
, ecs
->ptid
, &ecs
->ws
);
2684 /* If an error happens while handling the event, propagate GDB's
2685 knowledge of the executing state to the frontend/user running
2687 old_chain_2
= make_cleanup (finish_thread_state_cleanup
,
2690 /* Now figure out what to do with the result of the result. */
2691 handle_inferior_event (ecs
);
2693 /* No error, don't finish the state yet. */
2694 discard_cleanups (old_chain_2
);
2696 /* Breakpoints and watchpoints are not installed on the target
2697 at this point, and signals are passed directly to the
2698 inferior, so this must mean the process is gone. */
2699 if (!ecs
->wait_some_more
)
2701 discard_cleanups (old_chain_1
);
2702 error (_("Program exited while detaching"));
2706 discard_cleanups (old_chain_1
);
2709 /* Wait for control to return from inferior to debugger.
2711 If inferior gets a signal, we may decide to start it up again
2712 instead of returning. That is why there is a loop in this function.
2713 When this function actually returns it means the inferior
2714 should be left stopped and GDB should read more commands. */
2717 wait_for_inferior (void)
2719 struct cleanup
*old_cleanups
;
2723 (gdb_stdlog
, "infrun: wait_for_inferior ()\n");
2726 make_cleanup (delete_step_thread_step_resume_breakpoint_cleanup
, NULL
);
2730 struct execution_control_state ecss
;
2731 struct execution_control_state
*ecs
= &ecss
;
2732 struct cleanup
*old_chain
;
2734 memset (ecs
, 0, sizeof (*ecs
));
2736 overlay_cache_invalid
= 1;
2738 if (deprecated_target_wait_hook
)
2739 ecs
->ptid
= deprecated_target_wait_hook (waiton_ptid
, &ecs
->ws
, 0);
2741 ecs
->ptid
= target_wait (waiton_ptid
, &ecs
->ws
, 0);
2744 print_target_wait_results (waiton_ptid
, ecs
->ptid
, &ecs
->ws
);
2746 /* If an error happens while handling the event, propagate GDB's
2747 knowledge of the executing state to the frontend/user running
2749 old_chain
= make_cleanup (finish_thread_state_cleanup
, &minus_one_ptid
);
2751 /* Now figure out what to do with the result of the result. */
2752 handle_inferior_event (ecs
);
2754 /* No error, don't finish the state yet. */
2755 discard_cleanups (old_chain
);
2757 if (!ecs
->wait_some_more
)
2761 do_cleanups (old_cleanups
);
2764 /* Asynchronous version of wait_for_inferior. It is called by the
2765 event loop whenever a change of state is detected on the file
2766 descriptor corresponding to the target. It can be called more than
2767 once to complete a single execution command. In such cases we need
2768 to keep the state in a global variable ECSS. If it is the last time
2769 that this function is called for a single execution command, then
2770 report to the user that the inferior has stopped, and do the
2771 necessary cleanups. */
2774 fetch_inferior_event (void *client_data
)
2776 struct execution_control_state ecss
;
2777 struct execution_control_state
*ecs
= &ecss
;
2778 struct cleanup
*old_chain
= make_cleanup (null_cleanup
, NULL
);
2779 struct cleanup
*ts_old_chain
;
2780 int was_sync
= sync_execution
;
2783 memset (ecs
, 0, sizeof (*ecs
));
2785 /* We're handling a live event, so make sure we're doing live
2786 debugging. If we're looking at traceframes while the target is
2787 running, we're going to need to get back to that mode after
2788 handling the event. */
2791 make_cleanup_restore_current_traceframe ();
2792 set_current_traceframe (-1);
2796 /* In non-stop mode, the user/frontend should not notice a thread
2797 switch due to internal events. Make sure we reverse to the
2798 user selected thread and frame after handling the event and
2799 running any breakpoint commands. */
2800 make_cleanup_restore_current_thread ();
2802 overlay_cache_invalid
= 1;
2804 make_cleanup_restore_integer (&execution_direction
);
2805 execution_direction
= target_execution_direction ();
2807 if (deprecated_target_wait_hook
)
2809 deprecated_target_wait_hook (waiton_ptid
, &ecs
->ws
, TARGET_WNOHANG
);
2811 ecs
->ptid
= target_wait (waiton_ptid
, &ecs
->ws
, TARGET_WNOHANG
);
2814 print_target_wait_results (waiton_ptid
, ecs
->ptid
, &ecs
->ws
);
2816 /* If an error happens while handling the event, propagate GDB's
2817 knowledge of the executing state to the frontend/user running
2820 ts_old_chain
= make_cleanup (finish_thread_state_cleanup
, &minus_one_ptid
);
2822 ts_old_chain
= make_cleanup (finish_thread_state_cleanup
, &ecs
->ptid
);
2824 /* Get executed before make_cleanup_restore_current_thread above to apply
2825 still for the thread which has thrown the exception. */
2826 make_bpstat_clear_actions_cleanup ();
2828 /* Now figure out what to do with the result of the result. */
2829 handle_inferior_event (ecs
);
2831 if (!ecs
->wait_some_more
)
2833 struct inferior
*inf
= find_inferior_pid (ptid_get_pid (ecs
->ptid
));
2835 delete_step_thread_step_resume_breakpoint ();
2837 /* We may not find an inferior if this was a process exit. */
2838 if (inf
== NULL
|| inf
->control
.stop_soon
== NO_STOP_QUIETLY
)
2841 if (target_has_execution
2842 && ecs
->ws
.kind
!= TARGET_WAITKIND_NO_RESUMED
2843 && ecs
->ws
.kind
!= TARGET_WAITKIND_EXITED
2844 && ecs
->ws
.kind
!= TARGET_WAITKIND_SIGNALLED
2845 && ecs
->event_thread
->step_multi
2846 && ecs
->event_thread
->control
.stop_step
)
2847 inferior_event_handler (INF_EXEC_CONTINUE
, NULL
);
2850 inferior_event_handler (INF_EXEC_COMPLETE
, NULL
);
2855 /* No error, don't finish the thread states yet. */
2856 discard_cleanups (ts_old_chain
);
2858 /* Revert thread and frame. */
2859 do_cleanups (old_chain
);
2861 /* If the inferior was in sync execution mode, and now isn't,
2862 restore the prompt (a synchronous execution command has finished,
2863 and we're ready for input). */
2864 if (interpreter_async
&& was_sync
&& !sync_execution
)
2865 display_gdb_prompt (0);
2869 && exec_done_display_p
2870 && (ptid_equal (inferior_ptid
, null_ptid
)
2871 || !is_running (inferior_ptid
)))
2872 printf_unfiltered (_("completed.\n"));
2875 /* Record the frame and location we're currently stepping through. */
2877 set_step_info (struct frame_info
*frame
, struct symtab_and_line sal
)
2879 struct thread_info
*tp
= inferior_thread ();
2881 tp
->control
.step_frame_id
= get_frame_id (frame
);
2882 tp
->control
.step_stack_frame_id
= get_stack_frame_id (frame
);
2884 tp
->current_symtab
= sal
.symtab
;
2885 tp
->current_line
= sal
.line
;
2888 /* Clear context switchable stepping state. */
2891 init_thread_stepping_state (struct thread_info
*tss
)
2893 tss
->stepping_over_breakpoint
= 0;
2894 tss
->step_after_step_resume_breakpoint
= 0;
2897 /* Return the cached copy of the last pid/waitstatus returned by
2898 target_wait()/deprecated_target_wait_hook(). The data is actually
2899 cached by handle_inferior_event(), which gets called immediately
2900 after target_wait()/deprecated_target_wait_hook(). */
2903 get_last_target_status (ptid_t
*ptidp
, struct target_waitstatus
*status
)
2905 *ptidp
= target_last_wait_ptid
;
2906 *status
= target_last_waitstatus
;
2910 nullify_last_target_wait_ptid (void)
2912 target_last_wait_ptid
= minus_one_ptid
;
2915 /* Switch thread contexts. */
2918 context_switch (ptid_t ptid
)
2920 if (debug_infrun
&& !ptid_equal (ptid
, inferior_ptid
))
2922 fprintf_unfiltered (gdb_stdlog
, "infrun: Switching context from %s ",
2923 target_pid_to_str (inferior_ptid
));
2924 fprintf_unfiltered (gdb_stdlog
, "to %s\n",
2925 target_pid_to_str (ptid
));
2928 switch_to_thread (ptid
);
2932 adjust_pc_after_break (struct execution_control_state
*ecs
)
2934 struct regcache
*regcache
;
2935 struct gdbarch
*gdbarch
;
2936 struct address_space
*aspace
;
2937 CORE_ADDR breakpoint_pc
;
2939 /* If we've hit a breakpoint, we'll normally be stopped with SIGTRAP. If
2940 we aren't, just return.
2942 We assume that waitkinds other than TARGET_WAITKIND_STOPPED are not
2943 affected by gdbarch_decr_pc_after_break. Other waitkinds which are
2944 implemented by software breakpoints should be handled through the normal
2947 NOTE drow/2004-01-31: On some targets, breakpoints may generate
2948 different signals (SIGILL or SIGEMT for instance), but it is less
2949 clear where the PC is pointing afterwards. It may not match
2950 gdbarch_decr_pc_after_break. I don't know any specific target that
2951 generates these signals at breakpoints (the code has been in GDB since at
2952 least 1992) so I can not guess how to handle them here.
2954 In earlier versions of GDB, a target with
2955 gdbarch_have_nonsteppable_watchpoint would have the PC after hitting a
2956 watchpoint affected by gdbarch_decr_pc_after_break. I haven't found any
2957 target with both of these set in GDB history, and it seems unlikely to be
2958 correct, so gdbarch_have_nonsteppable_watchpoint is not checked here. */
2960 if (ecs
->ws
.kind
!= TARGET_WAITKIND_STOPPED
)
2963 if (ecs
->ws
.value
.sig
!= GDB_SIGNAL_TRAP
)
2966 /* In reverse execution, when a breakpoint is hit, the instruction
2967 under it has already been de-executed. The reported PC always
2968 points at the breakpoint address, so adjusting it further would
2969 be wrong. E.g., consider this case on a decr_pc_after_break == 1
2972 B1 0x08000000 : INSN1
2973 B2 0x08000001 : INSN2
2975 PC -> 0x08000003 : INSN4
2977 Say you're stopped at 0x08000003 as above. Reverse continuing
2978 from that point should hit B2 as below. Reading the PC when the
2979 SIGTRAP is reported should read 0x08000001 and INSN2 should have
2980 been de-executed already.
2982 B1 0x08000000 : INSN1
2983 B2 PC -> 0x08000001 : INSN2
2987 We can't apply the same logic as for forward execution, because
2988 we would wrongly adjust the PC to 0x08000000, since there's a
2989 breakpoint at PC - 1. We'd then report a hit on B1, although
2990 INSN1 hadn't been de-executed yet. Doing nothing is the correct
2992 if (execution_direction
== EXEC_REVERSE
)
2995 /* If this target does not decrement the PC after breakpoints, then
2996 we have nothing to do. */
2997 regcache
= get_thread_regcache (ecs
->ptid
);
2998 gdbarch
= get_regcache_arch (regcache
);
2999 if (gdbarch_decr_pc_after_break (gdbarch
) == 0)
3002 aspace
= get_regcache_aspace (regcache
);
3004 /* Find the location where (if we've hit a breakpoint) the
3005 breakpoint would be. */
3006 breakpoint_pc
= regcache_read_pc (regcache
)
3007 - gdbarch_decr_pc_after_break (gdbarch
);
3009 /* Check whether there actually is a software breakpoint inserted at
3012 If in non-stop mode, a race condition is possible where we've
3013 removed a breakpoint, but stop events for that breakpoint were
3014 already queued and arrive later. To suppress those spurious
3015 SIGTRAPs, we keep a list of such breakpoint locations for a bit,
3016 and retire them after a number of stop events are reported. */
3017 if (software_breakpoint_inserted_here_p (aspace
, breakpoint_pc
)
3018 || (non_stop
&& moribund_breakpoint_here_p (aspace
, breakpoint_pc
)))
3020 struct cleanup
*old_cleanups
= make_cleanup (null_cleanup
, NULL
);
3023 record_full_gdb_operation_disable_set ();
3025 /* When using hardware single-step, a SIGTRAP is reported for both
3026 a completed single-step and a software breakpoint. Need to
3027 differentiate between the two, as the latter needs adjusting
3028 but the former does not.
3030 The SIGTRAP can be due to a completed hardware single-step only if
3031 - we didn't insert software single-step breakpoints
3032 - the thread to be examined is still the current thread
3033 - this thread is currently being stepped
3035 If any of these events did not occur, we must have stopped due
3036 to hitting a software breakpoint, and have to back up to the
3039 As a special case, we could have hardware single-stepped a
3040 software breakpoint. In this case (prev_pc == breakpoint_pc),
3041 we also need to back up to the breakpoint address. */
3043 if (singlestep_breakpoints_inserted_p
3044 || !ptid_equal (ecs
->ptid
, inferior_ptid
)
3045 || !currently_stepping (ecs
->event_thread
)
3046 || ecs
->event_thread
->prev_pc
== breakpoint_pc
)
3047 regcache_write_pc (regcache
, breakpoint_pc
);
3049 do_cleanups (old_cleanups
);
3054 init_infwait_state (void)
3056 waiton_ptid
= pid_to_ptid (-1);
3057 infwait_state
= infwait_normal_state
;
3061 stepped_in_from (struct frame_info
*frame
, struct frame_id step_frame_id
)
3063 for (frame
= get_prev_frame (frame
);
3065 frame
= get_prev_frame (frame
))
3067 if (frame_id_eq (get_frame_id (frame
), step_frame_id
))
3069 if (get_frame_type (frame
) != INLINE_FRAME
)
3076 /* Auxiliary function that handles syscall entry/return events.
3077 It returns 1 if the inferior should keep going (and GDB
3078 should ignore the event), or 0 if the event deserves to be
3082 handle_syscall_event (struct execution_control_state
*ecs
)
3084 struct regcache
*regcache
;
3087 if (!ptid_equal (ecs
->ptid
, inferior_ptid
))
3088 context_switch (ecs
->ptid
);
3090 regcache
= get_thread_regcache (ecs
->ptid
);
3091 syscall_number
= ecs
->ws
.value
.syscall_number
;
3092 stop_pc
= regcache_read_pc (regcache
);
3094 if (catch_syscall_enabled () > 0
3095 && catching_syscall_number (syscall_number
) > 0)
3097 enum bpstat_signal_value sval
;
3100 fprintf_unfiltered (gdb_stdlog
, "infrun: syscall number = '%d'\n",
3103 ecs
->event_thread
->control
.stop_bpstat
3104 = bpstat_stop_status (get_regcache_aspace (regcache
),
3105 stop_pc
, ecs
->ptid
, &ecs
->ws
);
3107 sval
= bpstat_explains_signal (ecs
->event_thread
->control
.stop_bpstat
,
3109 ecs
->random_signal
= sval
== BPSTAT_SIGNAL_NO
;
3111 if (!ecs
->random_signal
)
3113 /* Catchpoint hit. */
3114 ecs
->event_thread
->suspend
.stop_signal
= GDB_SIGNAL_TRAP
;
3119 /* If no catchpoint triggered for this, then keep going. */
3120 ecs
->event_thread
->suspend
.stop_signal
= GDB_SIGNAL_0
;
3125 /* Lazily fill in the execution_control_state's stop_func_* fields. */
3128 fill_in_stop_func (struct gdbarch
*gdbarch
,
3129 struct execution_control_state
*ecs
)
3131 if (!ecs
->stop_func_filled_in
)
3133 /* Don't care about return value; stop_func_start and stop_func_name
3134 will both be 0 if it doesn't work. */
3135 find_pc_partial_function (stop_pc
, &ecs
->stop_func_name
,
3136 &ecs
->stop_func_start
, &ecs
->stop_func_end
);
3137 ecs
->stop_func_start
3138 += gdbarch_deprecated_function_start_offset (gdbarch
);
3140 ecs
->stop_func_filled_in
= 1;
3144 /* Given an execution control state that has been freshly filled in
3145 by an event from the inferior, figure out what it means and take
3146 appropriate action. */
3149 handle_inferior_event (struct execution_control_state
*ecs
)
3151 struct frame_info
*frame
;
3152 struct gdbarch
*gdbarch
;
3153 int stopped_by_watchpoint
;
3154 int stepped_after_stopped_by_watchpoint
= 0;
3155 enum stop_kind stop_soon
;
3157 if (ecs
->ws
.kind
== TARGET_WAITKIND_IGNORE
)
3159 /* We had an event in the inferior, but we are not interested in
3160 handling it at this level. The lower layers have already
3161 done what needs to be done, if anything.
3163 One of the possible circumstances for this is when the
3164 inferior produces output for the console. The inferior has
3165 not stopped, and we are ignoring the event. Another possible
3166 circumstance is any event which the lower level knows will be
3167 reported multiple times without an intervening resume. */
3169 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_IGNORE\n");
3170 prepare_to_wait (ecs
);
3174 if (ecs
->ws
.kind
== TARGET_WAITKIND_NO_RESUMED
3175 && target_can_async_p () && !sync_execution
)
3177 /* There were no unwaited-for children left in the target, but,
3178 we're not synchronously waiting for events either. Just
3179 ignore. Otherwise, if we were running a synchronous
3180 execution command, we need to cancel it and give the user
3181 back the terminal. */
3183 fprintf_unfiltered (gdb_stdlog
,
3184 "infrun: TARGET_WAITKIND_NO_RESUMED (ignoring)\n");
3185 prepare_to_wait (ecs
);
3189 if (ecs
->ws
.kind
!= TARGET_WAITKIND_EXITED
3190 && ecs
->ws
.kind
!= TARGET_WAITKIND_SIGNALLED
3191 && ecs
->ws
.kind
!= TARGET_WAITKIND_NO_RESUMED
)
3193 struct inferior
*inf
= find_inferior_pid (ptid_get_pid (ecs
->ptid
));
3196 stop_soon
= inf
->control
.stop_soon
;
3199 stop_soon
= NO_STOP_QUIETLY
;
3201 /* Cache the last pid/waitstatus. */
3202 target_last_wait_ptid
= ecs
->ptid
;
3203 target_last_waitstatus
= ecs
->ws
;
3205 /* Always clear state belonging to the previous time we stopped. */
3206 stop_stack_dummy
= STOP_NONE
;
3208 if (ecs
->ws
.kind
== TARGET_WAITKIND_NO_RESUMED
)
3210 /* No unwaited-for children left. IOW, all resumed children
3213 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_NO_RESUMED\n");
3215 stop_print_frame
= 0;
3216 stop_stepping (ecs
);
3220 if (ecs
->ws
.kind
!= TARGET_WAITKIND_EXITED
3221 && ecs
->ws
.kind
!= TARGET_WAITKIND_SIGNALLED
)
3223 ecs
->event_thread
= find_thread_ptid (ecs
->ptid
);
3224 /* If it's a new thread, add it to the thread database. */
3225 if (ecs
->event_thread
== NULL
)
3226 ecs
->event_thread
= add_thread (ecs
->ptid
);
3228 /* Disable range stepping. If the next step request could use a
3229 range, this will be end up re-enabled then. */
3230 ecs
->event_thread
->control
.may_range_step
= 0;
3233 /* Dependent on valid ECS->EVENT_THREAD. */
3234 adjust_pc_after_break (ecs
);
3236 /* Dependent on the current PC value modified by adjust_pc_after_break. */
3237 reinit_frame_cache ();
3239 breakpoint_retire_moribund ();
3241 /* First, distinguish signals caused by the debugger from signals
3242 that have to do with the program's own actions. Note that
3243 breakpoint insns may cause SIGTRAP or SIGILL or SIGEMT, depending
3244 on the operating system version. Here we detect when a SIGILL or
3245 SIGEMT is really a breakpoint and change it to SIGTRAP. We do
3246 something similar for SIGSEGV, since a SIGSEGV will be generated
3247 when we're trying to execute a breakpoint instruction on a
3248 non-executable stack. This happens for call dummy breakpoints
3249 for architectures like SPARC that place call dummies on the
3251 if (ecs
->ws
.kind
== TARGET_WAITKIND_STOPPED
3252 && (ecs
->ws
.value
.sig
== GDB_SIGNAL_ILL
3253 || ecs
->ws
.value
.sig
== GDB_SIGNAL_SEGV
3254 || ecs
->ws
.value
.sig
== GDB_SIGNAL_EMT
))
3256 struct regcache
*regcache
= get_thread_regcache (ecs
->ptid
);
3258 if (breakpoint_inserted_here_p (get_regcache_aspace (regcache
),
3259 regcache_read_pc (regcache
)))
3262 fprintf_unfiltered (gdb_stdlog
,
3263 "infrun: Treating signal as SIGTRAP\n");
3264 ecs
->ws
.value
.sig
= GDB_SIGNAL_TRAP
;
3268 /* Mark the non-executing threads accordingly. In all-stop, all
3269 threads of all processes are stopped when we get any event
3270 reported. In non-stop mode, only the event thread stops. If
3271 we're handling a process exit in non-stop mode, there's nothing
3272 to do, as threads of the dead process are gone, and threads of
3273 any other process were left running. */
3275 set_executing (minus_one_ptid
, 0);
3276 else if (ecs
->ws
.kind
!= TARGET_WAITKIND_SIGNALLED
3277 && ecs
->ws
.kind
!= TARGET_WAITKIND_EXITED
)
3278 set_executing (ecs
->ptid
, 0);
3280 switch (infwait_state
)
3282 case infwait_thread_hop_state
:
3284 fprintf_unfiltered (gdb_stdlog
, "infrun: infwait_thread_hop_state\n");
3287 case infwait_normal_state
:
3289 fprintf_unfiltered (gdb_stdlog
, "infrun: infwait_normal_state\n");
3292 case infwait_step_watch_state
:
3294 fprintf_unfiltered (gdb_stdlog
,
3295 "infrun: infwait_step_watch_state\n");
3297 stepped_after_stopped_by_watchpoint
= 1;
3300 case infwait_nonstep_watch_state
:
3302 fprintf_unfiltered (gdb_stdlog
,
3303 "infrun: infwait_nonstep_watch_state\n");
3304 insert_breakpoints ();
3306 /* FIXME-maybe: is this cleaner than setting a flag? Does it
3307 handle things like signals arriving and other things happening
3308 in combination correctly? */
3309 stepped_after_stopped_by_watchpoint
= 1;
3313 internal_error (__FILE__
, __LINE__
, _("bad switch"));
3316 infwait_state
= infwait_normal_state
;
3317 waiton_ptid
= pid_to_ptid (-1);
3319 switch (ecs
->ws
.kind
)
3321 case TARGET_WAITKIND_LOADED
:
3323 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_LOADED\n");
3324 /* Ignore gracefully during startup of the inferior, as it might
3325 be the shell which has just loaded some objects, otherwise
3326 add the symbols for the newly loaded objects. Also ignore at
3327 the beginning of an attach or remote session; we will query
3328 the full list of libraries once the connection is
3330 if (stop_soon
== NO_STOP_QUIETLY
)
3332 struct regcache
*regcache
;
3333 enum bpstat_signal_value sval
;
3335 if (!ptid_equal (ecs
->ptid
, inferior_ptid
))
3336 context_switch (ecs
->ptid
);
3337 regcache
= get_thread_regcache (ecs
->ptid
);
3339 handle_solib_event ();
3341 ecs
->event_thread
->control
.stop_bpstat
3342 = bpstat_stop_status (get_regcache_aspace (regcache
),
3343 stop_pc
, ecs
->ptid
, &ecs
->ws
);
3346 = bpstat_explains_signal (ecs
->event_thread
->control
.stop_bpstat
,
3348 ecs
->random_signal
= sval
== BPSTAT_SIGNAL_NO
;
3350 if (!ecs
->random_signal
)
3352 /* A catchpoint triggered. */
3353 ecs
->event_thread
->suspend
.stop_signal
= GDB_SIGNAL_TRAP
;
3354 process_event_stop_test (ecs
);
3358 /* If requested, stop when the dynamic linker notifies
3359 gdb of events. This allows the user to get control
3360 and place breakpoints in initializer routines for
3361 dynamically loaded objects (among other things). */
3362 ecs
->event_thread
->suspend
.stop_signal
= GDB_SIGNAL_0
;
3363 if (stop_on_solib_events
)
3365 /* Make sure we print "Stopped due to solib-event" in
3367 stop_print_frame
= 1;
3369 stop_stepping (ecs
);
3374 /* If we are skipping through a shell, or through shared library
3375 loading that we aren't interested in, resume the program. If
3376 we're running the program normally, also resume. But stop if
3377 we're attaching or setting up a remote connection. */
3378 if (stop_soon
== STOP_QUIETLY
|| stop_soon
== NO_STOP_QUIETLY
)
3380 if (!ptid_equal (ecs
->ptid
, inferior_ptid
))
3381 context_switch (ecs
->ptid
);
3383 /* Loading of shared libraries might have changed breakpoint
3384 addresses. Make sure new breakpoints are inserted. */
3385 if (stop_soon
== NO_STOP_QUIETLY
3386 && !breakpoints_always_inserted_mode ())
3387 insert_breakpoints ();
3388 resume (0, GDB_SIGNAL_0
);
3389 prepare_to_wait (ecs
);
3395 case TARGET_WAITKIND_SPURIOUS
:
3397 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_SPURIOUS\n");
3398 if (!ptid_equal (ecs
->ptid
, inferior_ptid
))
3399 context_switch (ecs
->ptid
);
3400 resume (0, GDB_SIGNAL_0
);
3401 prepare_to_wait (ecs
);
3404 case TARGET_WAITKIND_EXITED
:
3405 case TARGET_WAITKIND_SIGNALLED
:
3408 if (ecs
->ws
.kind
== TARGET_WAITKIND_EXITED
)
3409 fprintf_unfiltered (gdb_stdlog
,
3410 "infrun: TARGET_WAITKIND_EXITED\n");
3412 fprintf_unfiltered (gdb_stdlog
,
3413 "infrun: TARGET_WAITKIND_SIGNALLED\n");
3416 inferior_ptid
= ecs
->ptid
;
3417 set_current_inferior (find_inferior_pid (ptid_get_pid (ecs
->ptid
)));
3418 set_current_program_space (current_inferior ()->pspace
);
3419 handle_vfork_child_exec_or_exit (0);
3420 target_terminal_ours (); /* Must do this before mourn anyway. */
3422 /* Clearing any previous state of convenience variables. */
3423 clear_exit_convenience_vars ();
3425 if (ecs
->ws
.kind
== TARGET_WAITKIND_EXITED
)
3427 /* Record the exit code in the convenience variable $_exitcode, so
3428 that the user can inspect this again later. */
3429 set_internalvar_integer (lookup_internalvar ("_exitcode"),
3430 (LONGEST
) ecs
->ws
.value
.integer
);
3432 /* Also record this in the inferior itself. */
3433 current_inferior ()->has_exit_code
= 1;
3434 current_inferior ()->exit_code
= (LONGEST
) ecs
->ws
.value
.integer
;
3436 print_exited_reason (ecs
->ws
.value
.integer
);
3440 struct regcache
*regcache
= get_thread_regcache (ecs
->ptid
);
3441 struct gdbarch
*gdbarch
= get_regcache_arch (regcache
);
3443 if (gdbarch_gdb_signal_to_target_p (gdbarch
))
3445 /* Set the value of the internal variable $_exitsignal,
3446 which holds the signal uncaught by the inferior. */
3447 set_internalvar_integer (lookup_internalvar ("_exitsignal"),
3448 gdbarch_gdb_signal_to_target (gdbarch
,
3449 ecs
->ws
.value
.sig
));
3453 /* We don't have access to the target's method used for
3454 converting between signal numbers (GDB's internal
3455 representation <-> target's representation).
3456 Therefore, we cannot do a good job at displaying this
3457 information to the user. It's better to just warn
3458 her about it (if infrun debugging is enabled), and
3461 fprintf_filtered (gdb_stdlog
, _("\
3462 Cannot fill $_exitsignal with the correct signal number.\n"));
3465 print_signal_exited_reason (ecs
->ws
.value
.sig
);
3468 gdb_flush (gdb_stdout
);
3469 target_mourn_inferior ();
3470 singlestep_breakpoints_inserted_p
= 0;
3471 cancel_single_step_breakpoints ();
3472 stop_print_frame
= 0;
3473 stop_stepping (ecs
);
3476 /* The following are the only cases in which we keep going;
3477 the above cases end in a continue or goto. */
3478 case TARGET_WAITKIND_FORKED
:
3479 case TARGET_WAITKIND_VFORKED
:
3482 if (ecs
->ws
.kind
== TARGET_WAITKIND_FORKED
)
3483 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_FORKED\n");
3485 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_VFORKED\n");
3488 /* Check whether the inferior is displaced stepping. */
3490 struct regcache
*regcache
= get_thread_regcache (ecs
->ptid
);
3491 struct gdbarch
*gdbarch
= get_regcache_arch (regcache
);
3492 struct displaced_step_inferior_state
*displaced
3493 = get_displaced_stepping_state (ptid_get_pid (ecs
->ptid
));
3495 /* If checking displaced stepping is supported, and thread
3496 ecs->ptid is displaced stepping. */
3497 if (displaced
&& ptid_equal (displaced
->step_ptid
, ecs
->ptid
))
3499 struct inferior
*parent_inf
3500 = find_inferior_pid (ptid_get_pid (ecs
->ptid
));
3501 struct regcache
*child_regcache
;
3502 CORE_ADDR parent_pc
;
3504 /* GDB has got TARGET_WAITKIND_FORKED or TARGET_WAITKIND_VFORKED,
3505 indicating that the displaced stepping of syscall instruction
3506 has been done. Perform cleanup for parent process here. Note
3507 that this operation also cleans up the child process for vfork,
3508 because their pages are shared. */
3509 displaced_step_fixup (ecs
->ptid
, GDB_SIGNAL_TRAP
);
3511 if (ecs
->ws
.kind
== TARGET_WAITKIND_FORKED
)
3513 /* Restore scratch pad for child process. */
3514 displaced_step_restore (displaced
, ecs
->ws
.value
.related_pid
);
3517 /* Since the vfork/fork syscall instruction was executed in the scratchpad,
3518 the child's PC is also within the scratchpad. Set the child's PC
3519 to the parent's PC value, which has already been fixed up.
3520 FIXME: we use the parent's aspace here, although we're touching
3521 the child, because the child hasn't been added to the inferior
3522 list yet at this point. */
3525 = get_thread_arch_aspace_regcache (ecs
->ws
.value
.related_pid
,
3527 parent_inf
->aspace
);
3528 /* Read PC value of parent process. */
3529 parent_pc
= regcache_read_pc (regcache
);
3531 if (debug_displaced
)
3532 fprintf_unfiltered (gdb_stdlog
,
3533 "displaced: write child pc from %s to %s\n",
3535 regcache_read_pc (child_regcache
)),
3536 paddress (gdbarch
, parent_pc
));
3538 regcache_write_pc (child_regcache
, parent_pc
);
3542 if (!ptid_equal (ecs
->ptid
, inferior_ptid
))
3543 context_switch (ecs
->ptid
);
3545 /* Immediately detach breakpoints from the child before there's
3546 any chance of letting the user delete breakpoints from the
3547 breakpoint lists. If we don't do this early, it's easy to
3548 leave left over traps in the child, vis: "break foo; catch
3549 fork; c; <fork>; del; c; <child calls foo>". We only follow
3550 the fork on the last `continue', and by that time the
3551 breakpoint at "foo" is long gone from the breakpoint table.
3552 If we vforked, then we don't need to unpatch here, since both
3553 parent and child are sharing the same memory pages; we'll
3554 need to unpatch at follow/detach time instead to be certain
3555 that new breakpoints added between catchpoint hit time and
3556 vfork follow are detached. */
3557 if (ecs
->ws
.kind
!= TARGET_WAITKIND_VFORKED
)
3559 /* This won't actually modify the breakpoint list, but will
3560 physically remove the breakpoints from the child. */
3561 detach_breakpoints (ecs
->ws
.value
.related_pid
);
3564 if (singlestep_breakpoints_inserted_p
)
3566 /* Pull the single step breakpoints out of the target. */
3567 remove_single_step_breakpoints ();
3568 singlestep_breakpoints_inserted_p
= 0;
3571 /* In case the event is caught by a catchpoint, remember that
3572 the event is to be followed at the next resume of the thread,
3573 and not immediately. */
3574 ecs
->event_thread
->pending_follow
= ecs
->ws
;
3576 stop_pc
= regcache_read_pc (get_thread_regcache (ecs
->ptid
));
3578 ecs
->event_thread
->control
.stop_bpstat
3579 = bpstat_stop_status (get_regcache_aspace (get_current_regcache ()),
3580 stop_pc
, ecs
->ptid
, &ecs
->ws
);
3582 /* Note that we're interested in knowing the bpstat actually
3583 causes a stop, not just if it may explain the signal.
3584 Software watchpoints, for example, always appear in the
3587 = !bpstat_causes_stop (ecs
->event_thread
->control
.stop_bpstat
);
3589 /* If no catchpoint triggered for this, then keep going. */
3590 if (ecs
->random_signal
)
3596 = (follow_fork_mode_string
== follow_fork_mode_child
);
3598 ecs
->event_thread
->suspend
.stop_signal
= GDB_SIGNAL_0
;
3600 should_resume
= follow_fork ();
3603 child
= ecs
->ws
.value
.related_pid
;
3605 /* In non-stop mode, also resume the other branch. */
3606 if (non_stop
&& !detach_fork
)
3609 switch_to_thread (parent
);
3611 switch_to_thread (child
);
3613 ecs
->event_thread
= inferior_thread ();
3614 ecs
->ptid
= inferior_ptid
;
3619 switch_to_thread (child
);
3621 switch_to_thread (parent
);
3623 ecs
->event_thread
= inferior_thread ();
3624 ecs
->ptid
= inferior_ptid
;
3629 stop_stepping (ecs
);
3632 ecs
->event_thread
->suspend
.stop_signal
= GDB_SIGNAL_TRAP
;
3633 process_event_stop_test (ecs
);
3636 case TARGET_WAITKIND_VFORK_DONE
:
3637 /* Done with the shared memory region. Re-insert breakpoints in
3638 the parent, and keep going. */
3641 fprintf_unfiltered (gdb_stdlog
,
3642 "infrun: TARGET_WAITKIND_VFORK_DONE\n");
3644 if (!ptid_equal (ecs
->ptid
, inferior_ptid
))
3645 context_switch (ecs
->ptid
);
3647 current_inferior ()->waiting_for_vfork_done
= 0;
3648 current_inferior ()->pspace
->breakpoints_not_allowed
= 0;
3649 /* This also takes care of reinserting breakpoints in the
3650 previously locked inferior. */
3654 case TARGET_WAITKIND_EXECD
:
3656 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_EXECD\n");
3658 if (!ptid_equal (ecs
->ptid
, inferior_ptid
))
3659 context_switch (ecs
->ptid
);
3661 singlestep_breakpoints_inserted_p
= 0;
3662 cancel_single_step_breakpoints ();
3664 stop_pc
= regcache_read_pc (get_thread_regcache (ecs
->ptid
));
3666 /* Do whatever is necessary to the parent branch of the vfork. */
3667 handle_vfork_child_exec_or_exit (1);
3669 /* This causes the eventpoints and symbol table to be reset.
3670 Must do this now, before trying to determine whether to
3672 follow_exec (inferior_ptid
, ecs
->ws
.value
.execd_pathname
);
3674 ecs
->event_thread
->control
.stop_bpstat
3675 = bpstat_stop_status (get_regcache_aspace (get_current_regcache ()),
3676 stop_pc
, ecs
->ptid
, &ecs
->ws
);
3678 = (bpstat_explains_signal (ecs
->event_thread
->control
.stop_bpstat
,
3680 == BPSTAT_SIGNAL_NO
);
3682 /* Note that this may be referenced from inside
3683 bpstat_stop_status above, through inferior_has_execd. */
3684 xfree (ecs
->ws
.value
.execd_pathname
);
3685 ecs
->ws
.value
.execd_pathname
= NULL
;
3687 /* If no catchpoint triggered for this, then keep going. */
3688 if (ecs
->random_signal
)
3690 ecs
->event_thread
->suspend
.stop_signal
= GDB_SIGNAL_0
;
3694 ecs
->event_thread
->suspend
.stop_signal
= GDB_SIGNAL_TRAP
;
3695 process_event_stop_test (ecs
);
3698 /* Be careful not to try to gather much state about a thread
3699 that's in a syscall. It's frequently a losing proposition. */
3700 case TARGET_WAITKIND_SYSCALL_ENTRY
:
3702 fprintf_unfiltered (gdb_stdlog
,
3703 "infrun: TARGET_WAITKIND_SYSCALL_ENTRY\n");
3704 /* Getting the current syscall number. */
3705 if (handle_syscall_event (ecs
) == 0)
3706 process_event_stop_test (ecs
);
3709 /* Before examining the threads further, step this thread to
3710 get it entirely out of the syscall. (We get notice of the
3711 event when the thread is just on the verge of exiting a
3712 syscall. Stepping one instruction seems to get it back
3714 case TARGET_WAITKIND_SYSCALL_RETURN
:
3716 fprintf_unfiltered (gdb_stdlog
,
3717 "infrun: TARGET_WAITKIND_SYSCALL_RETURN\n");
3718 if (handle_syscall_event (ecs
) == 0)
3719 process_event_stop_test (ecs
);
3722 case TARGET_WAITKIND_STOPPED
:
3724 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_STOPPED\n");
3725 ecs
->event_thread
->suspend
.stop_signal
= ecs
->ws
.value
.sig
;
3728 case TARGET_WAITKIND_NO_HISTORY
:
3730 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_NO_HISTORY\n");
3731 /* Reverse execution: target ran out of history info. */
3733 /* Pull the single step breakpoints out of the target. */
3734 if (singlestep_breakpoints_inserted_p
)
3736 if (!ptid_equal (ecs
->ptid
, inferior_ptid
))
3737 context_switch (ecs
->ptid
);
3738 remove_single_step_breakpoints ();
3739 singlestep_breakpoints_inserted_p
= 0;
3741 stop_pc
= regcache_read_pc (get_thread_regcache (ecs
->ptid
));
3742 print_no_history_reason ();
3743 stop_stepping (ecs
);
3747 if (ecs
->ws
.kind
== TARGET_WAITKIND_STOPPED
)
3749 /* Do we need to clean up the state of a thread that has
3750 completed a displaced single-step? (Doing so usually affects
3751 the PC, so do it here, before we set stop_pc.) */
3752 displaced_step_fixup (ecs
->ptid
,
3753 ecs
->event_thread
->suspend
.stop_signal
);
3755 /* If we either finished a single-step or hit a breakpoint, but
3756 the user wanted this thread to be stopped, pretend we got a
3757 SIG0 (generic unsignaled stop). */
3759 if (ecs
->event_thread
->stop_requested
3760 && ecs
->event_thread
->suspend
.stop_signal
== GDB_SIGNAL_TRAP
)
3761 ecs
->event_thread
->suspend
.stop_signal
= GDB_SIGNAL_0
;
3764 stop_pc
= regcache_read_pc (get_thread_regcache (ecs
->ptid
));
3768 struct regcache
*regcache
= get_thread_regcache (ecs
->ptid
);
3769 struct gdbarch
*gdbarch
= get_regcache_arch (regcache
);
3770 struct cleanup
*old_chain
= save_inferior_ptid ();
3772 inferior_ptid
= ecs
->ptid
;
3774 fprintf_unfiltered (gdb_stdlog
, "infrun: stop_pc = %s\n",
3775 paddress (gdbarch
, stop_pc
));
3776 if (target_stopped_by_watchpoint ())
3780 fprintf_unfiltered (gdb_stdlog
, "infrun: stopped by watchpoint\n");
3782 if (target_stopped_data_address (¤t_target
, &addr
))
3783 fprintf_unfiltered (gdb_stdlog
,
3784 "infrun: stopped data address = %s\n",
3785 paddress (gdbarch
, addr
));
3787 fprintf_unfiltered (gdb_stdlog
,
3788 "infrun: (no data address available)\n");
3791 do_cleanups (old_chain
);
3794 if (stepping_past_singlestep_breakpoint
)
3796 gdb_assert (singlestep_breakpoints_inserted_p
);
3797 gdb_assert (ptid_equal (singlestep_ptid
, ecs
->ptid
));
3798 gdb_assert (!ptid_equal (singlestep_ptid
, saved_singlestep_ptid
));
3800 stepping_past_singlestep_breakpoint
= 0;
3802 /* We've either finished single-stepping past the single-step
3803 breakpoint, or stopped for some other reason. It would be nice if
3804 we could tell, but we can't reliably. */
3805 if (ecs
->event_thread
->suspend
.stop_signal
== GDB_SIGNAL_TRAP
)
3808 fprintf_unfiltered (gdb_stdlog
,
3809 "infrun: stepping_past_"
3810 "singlestep_breakpoint\n");
3811 /* Pull the single step breakpoints out of the target. */
3812 if (!ptid_equal (ecs
->ptid
, inferior_ptid
))
3813 context_switch (ecs
->ptid
);
3814 remove_single_step_breakpoints ();
3815 singlestep_breakpoints_inserted_p
= 0;
3817 ecs
->event_thread
->control
.trap_expected
= 0;
3819 context_switch (saved_singlestep_ptid
);
3820 if (deprecated_context_hook
)
3821 deprecated_context_hook (pid_to_thread_id (saved_singlestep_ptid
));
3823 resume (1, GDB_SIGNAL_0
);
3824 prepare_to_wait (ecs
);
3829 if (!ptid_equal (deferred_step_ptid
, null_ptid
))
3831 /* In non-stop mode, there's never a deferred_step_ptid set. */
3832 gdb_assert (!non_stop
);
3834 /* If we stopped for some other reason than single-stepping, ignore
3835 the fact that we were supposed to switch back. */
3836 if (ecs
->event_thread
->suspend
.stop_signal
== GDB_SIGNAL_TRAP
)
3839 fprintf_unfiltered (gdb_stdlog
,
3840 "infrun: handling deferred step\n");
3842 /* Pull the single step breakpoints out of the target. */
3843 if (singlestep_breakpoints_inserted_p
)
3845 if (!ptid_equal (ecs
->ptid
, inferior_ptid
))
3846 context_switch (ecs
->ptid
);
3847 remove_single_step_breakpoints ();
3848 singlestep_breakpoints_inserted_p
= 0;
3851 ecs
->event_thread
->control
.trap_expected
= 0;
3853 context_switch (deferred_step_ptid
);
3854 deferred_step_ptid
= null_ptid
;
3855 /* Suppress spurious "Switching to ..." message. */
3856 previous_inferior_ptid
= inferior_ptid
;
3858 resume (1, GDB_SIGNAL_0
);
3859 prepare_to_wait (ecs
);
3863 deferred_step_ptid
= null_ptid
;
3866 /* See if a thread hit a thread-specific breakpoint that was meant for
3867 another thread. If so, then step that thread past the breakpoint,
3870 if (ecs
->event_thread
->suspend
.stop_signal
== GDB_SIGNAL_TRAP
)
3872 int thread_hop_needed
= 0;
3873 struct address_space
*aspace
=
3874 get_regcache_aspace (get_thread_regcache (ecs
->ptid
));
3876 /* Check if a regular breakpoint has been hit before checking
3877 for a potential single step breakpoint. Otherwise, GDB will
3878 not see this breakpoint hit when stepping onto breakpoints. */
3879 if (regular_breakpoint_inserted_here_p (aspace
, stop_pc
))
3881 if (!breakpoint_thread_match (aspace
, stop_pc
, ecs
->ptid
))
3882 thread_hop_needed
= 1;
3884 else if (singlestep_breakpoints_inserted_p
)
3886 /* We have not context switched yet, so this should be true
3887 no matter which thread hit the singlestep breakpoint. */
3888 gdb_assert (ptid_equal (inferior_ptid
, singlestep_ptid
));
3890 fprintf_unfiltered (gdb_stdlog
, "infrun: software single step "
3892 target_pid_to_str (ecs
->ptid
));
3894 /* The call to in_thread_list is necessary because PTIDs sometimes
3895 change when we go from single-threaded to multi-threaded. If
3896 the singlestep_ptid is still in the list, assume that it is
3897 really different from ecs->ptid. */
3898 if (!ptid_equal (singlestep_ptid
, ecs
->ptid
)
3899 && in_thread_list (singlestep_ptid
))
3901 /* If the PC of the thread we were trying to single-step
3902 has changed, discard this event (which we were going
3903 to ignore anyway), and pretend we saw that thread
3904 trap. This prevents us continuously moving the
3905 single-step breakpoint forward, one instruction at a
3906 time. If the PC has changed, then the thread we were
3907 trying to single-step has trapped or been signalled,
3908 but the event has not been reported to GDB yet.
3910 There might be some cases where this loses signal
3911 information, if a signal has arrived at exactly the
3912 same time that the PC changed, but this is the best
3913 we can do with the information available. Perhaps we
3914 should arrange to report all events for all threads
3915 when they stop, or to re-poll the remote looking for
3916 this particular thread (i.e. temporarily enable
3919 CORE_ADDR new_singlestep_pc
3920 = regcache_read_pc (get_thread_regcache (singlestep_ptid
));
3922 if (new_singlestep_pc
!= singlestep_pc
)
3924 enum gdb_signal stop_signal
;
3927 fprintf_unfiltered (gdb_stdlog
, "infrun: unexpected thread,"
3928 " but expected thread advanced also\n");
3930 /* The current context still belongs to
3931 singlestep_ptid. Don't swap here, since that's
3932 the context we want to use. Just fudge our
3933 state and continue. */
3934 stop_signal
= ecs
->event_thread
->suspend
.stop_signal
;
3935 ecs
->event_thread
->suspend
.stop_signal
= GDB_SIGNAL_0
;
3936 ecs
->ptid
= singlestep_ptid
;
3937 ecs
->event_thread
= find_thread_ptid (ecs
->ptid
);
3938 ecs
->event_thread
->suspend
.stop_signal
= stop_signal
;
3939 stop_pc
= new_singlestep_pc
;
3944 fprintf_unfiltered (gdb_stdlog
,
3945 "infrun: unexpected thread\n");
3947 thread_hop_needed
= 1;
3948 stepping_past_singlestep_breakpoint
= 1;
3949 saved_singlestep_ptid
= singlestep_ptid
;
3954 if (thread_hop_needed
)
3956 struct regcache
*thread_regcache
;
3957 int remove_status
= 0;
3960 fprintf_unfiltered (gdb_stdlog
, "infrun: thread_hop_needed\n");
3962 /* Switch context before touching inferior memory, the
3963 previous thread may have exited. */
3964 if (!ptid_equal (inferior_ptid
, ecs
->ptid
))
3965 context_switch (ecs
->ptid
);
3967 /* Saw a breakpoint, but it was hit by the wrong thread.
3970 if (singlestep_breakpoints_inserted_p
)
3972 /* Pull the single step breakpoints out of the target. */
3973 remove_single_step_breakpoints ();
3974 singlestep_breakpoints_inserted_p
= 0;
3977 /* If the arch can displace step, don't remove the
3979 thread_regcache
= get_thread_regcache (ecs
->ptid
);
3980 if (!use_displaced_stepping (get_regcache_arch (thread_regcache
)))
3981 remove_status
= remove_breakpoints ();
3983 /* Did we fail to remove breakpoints? If so, try
3984 to set the PC past the bp. (There's at least
3985 one situation in which we can fail to remove
3986 the bp's: On HP-UX's that use ttrace, we can't
3987 change the address space of a vforking child
3988 process until the child exits (well, okay, not
3989 then either :-) or execs. */
3990 if (remove_status
!= 0)
3991 error (_("Cannot step over breakpoint hit in wrong thread"));
3996 /* Only need to require the next event from this
3997 thread in all-stop mode. */
3998 waiton_ptid
= ecs
->ptid
;
3999 infwait_state
= infwait_thread_hop_state
;
4002 ecs
->event_thread
->stepping_over_breakpoint
= 1;
4009 /* See if something interesting happened to the non-current thread. If
4010 so, then switch to that thread. */
4011 if (!ptid_equal (ecs
->ptid
, inferior_ptid
))
4014 fprintf_unfiltered (gdb_stdlog
, "infrun: context switch\n");
4016 context_switch (ecs
->ptid
);
4018 if (deprecated_context_hook
)
4019 deprecated_context_hook (pid_to_thread_id (ecs
->ptid
));
4022 /* At this point, get hold of the now-current thread's frame. */
4023 frame
= get_current_frame ();
4024 gdbarch
= get_frame_arch (frame
);
4026 if (singlestep_breakpoints_inserted_p
)
4028 /* Pull the single step breakpoints out of the target. */
4029 remove_single_step_breakpoints ();
4030 singlestep_breakpoints_inserted_p
= 0;
4033 if (stepped_after_stopped_by_watchpoint
)
4034 stopped_by_watchpoint
= 0;
4036 stopped_by_watchpoint
= watchpoints_triggered (&ecs
->ws
);
4038 /* If necessary, step over this watchpoint. We'll be back to display
4040 if (stopped_by_watchpoint
4041 && (target_have_steppable_watchpoint
4042 || gdbarch_have_nonsteppable_watchpoint (gdbarch
)))
4044 /* At this point, we are stopped at an instruction which has
4045 attempted to write to a piece of memory under control of
4046 a watchpoint. The instruction hasn't actually executed
4047 yet. If we were to evaluate the watchpoint expression
4048 now, we would get the old value, and therefore no change
4049 would seem to have occurred.
4051 In order to make watchpoints work `right', we really need
4052 to complete the memory write, and then evaluate the
4053 watchpoint expression. We do this by single-stepping the
4056 It may not be necessary to disable the watchpoint to stop over
4057 it. For example, the PA can (with some kernel cooperation)
4058 single step over a watchpoint without disabling the watchpoint.
4060 It is far more common to need to disable a watchpoint to step
4061 the inferior over it. If we have non-steppable watchpoints,
4062 we must disable the current watchpoint; it's simplest to
4063 disable all watchpoints and breakpoints. */
4066 if (!target_have_steppable_watchpoint
)
4068 remove_breakpoints ();
4069 /* See comment in resume why we need to stop bypassing signals
4070 while breakpoints have been removed. */
4071 target_pass_signals (0, NULL
);
4074 hw_step
= maybe_software_singlestep (gdbarch
, stop_pc
);
4075 target_resume (ecs
->ptid
, hw_step
, GDB_SIGNAL_0
);
4076 waiton_ptid
= ecs
->ptid
;
4077 if (target_have_steppable_watchpoint
)
4078 infwait_state
= infwait_step_watch_state
;
4080 infwait_state
= infwait_nonstep_watch_state
;
4081 prepare_to_wait (ecs
);
4085 ecs
->event_thread
->stepping_over_breakpoint
= 0;
4086 bpstat_clear (&ecs
->event_thread
->control
.stop_bpstat
);
4087 ecs
->event_thread
->control
.stop_step
= 0;
4088 stop_print_frame
= 1;
4089 stopped_by_random_signal
= 0;
4091 /* Hide inlined functions starting here, unless we just performed stepi or
4092 nexti. After stepi and nexti, always show the innermost frame (not any
4093 inline function call sites). */
4094 if (ecs
->event_thread
->control
.step_range_end
!= 1)
4096 struct address_space
*aspace
=
4097 get_regcache_aspace (get_thread_regcache (ecs
->ptid
));
4099 /* skip_inline_frames is expensive, so we avoid it if we can
4100 determine that the address is one where functions cannot have
4101 been inlined. This improves performance with inferiors that
4102 load a lot of shared libraries, because the solib event
4103 breakpoint is defined as the address of a function (i.e. not
4104 inline). Note that we have to check the previous PC as well
4105 as the current one to catch cases when we have just
4106 single-stepped off a breakpoint prior to reinstating it.
4107 Note that we're assuming that the code we single-step to is
4108 not inline, but that's not definitive: there's nothing
4109 preventing the event breakpoint function from containing
4110 inlined code, and the single-step ending up there. If the
4111 user had set a breakpoint on that inlined code, the missing
4112 skip_inline_frames call would break things. Fortunately
4113 that's an extremely unlikely scenario. */
4114 if (!pc_at_non_inline_function (aspace
, stop_pc
, &ecs
->ws
)
4115 && !(ecs
->event_thread
->suspend
.stop_signal
== GDB_SIGNAL_TRAP
4116 && ecs
->event_thread
->control
.trap_expected
4117 && pc_at_non_inline_function (aspace
,
4118 ecs
->event_thread
->prev_pc
,
4121 skip_inline_frames (ecs
->ptid
);
4123 /* Re-fetch current thread's frame in case that invalidated
4125 frame
= get_current_frame ();
4126 gdbarch
= get_frame_arch (frame
);
4130 if (ecs
->event_thread
->suspend
.stop_signal
== GDB_SIGNAL_TRAP
4131 && ecs
->event_thread
->control
.trap_expected
4132 && gdbarch_single_step_through_delay_p (gdbarch
)
4133 && currently_stepping (ecs
->event_thread
))
4135 /* We're trying to step off a breakpoint. Turns out that we're
4136 also on an instruction that needs to be stepped multiple
4137 times before it's been fully executing. E.g., architectures
4138 with a delay slot. It needs to be stepped twice, once for
4139 the instruction and once for the delay slot. */
4140 int step_through_delay
4141 = gdbarch_single_step_through_delay (gdbarch
, frame
);
4143 if (debug_infrun
&& step_through_delay
)
4144 fprintf_unfiltered (gdb_stdlog
, "infrun: step through delay\n");
4145 if (ecs
->event_thread
->control
.step_range_end
== 0
4146 && step_through_delay
)
4148 /* The user issued a continue when stopped at a breakpoint.
4149 Set up for another trap and get out of here. */
4150 ecs
->event_thread
->stepping_over_breakpoint
= 1;
4154 else if (step_through_delay
)
4156 /* The user issued a step when stopped at a breakpoint.
4157 Maybe we should stop, maybe we should not - the delay
4158 slot *might* correspond to a line of source. In any
4159 case, don't decide that here, just set
4160 ecs->stepping_over_breakpoint, making sure we
4161 single-step again before breakpoints are re-inserted. */
4162 ecs
->event_thread
->stepping_over_breakpoint
= 1;
4166 /* Look at the cause of the stop, and decide what to do.
4167 The alternatives are:
4168 1) stop_stepping and return; to really stop and return to the debugger,
4169 2) keep_going and return to start up again
4170 (set ecs->event_thread->stepping_over_breakpoint to 1 to single step once)
4171 3) set ecs->random_signal to 1, and the decision between 1 and 2
4172 will be made according to the signal handling tables. */
4174 if (ecs
->event_thread
->suspend
.stop_signal
== GDB_SIGNAL_TRAP
4178 fprintf_unfiltered (gdb_stdlog
, "infrun: stopped\n");
4179 stop_print_frame
= 0;
4180 stop_stepping (ecs
);
4184 /* This is originated from start_remote(), start_inferior() and
4185 shared libraries hook functions. */
4186 if (stop_soon
== STOP_QUIETLY
|| stop_soon
== STOP_QUIETLY_REMOTE
)
4189 fprintf_unfiltered (gdb_stdlog
, "infrun: quietly stopped\n");
4190 stop_stepping (ecs
);
4194 /* This originates from attach_command(). We need to overwrite
4195 the stop_signal here, because some kernels don't ignore a
4196 SIGSTOP in a subsequent ptrace(PTRACE_CONT,SIGSTOP) call.
4197 See more comments in inferior.h. On the other hand, if we
4198 get a non-SIGSTOP, report it to the user - assume the backend
4199 will handle the SIGSTOP if it should show up later.
4201 Also consider that the attach is complete when we see a
4202 SIGTRAP. Some systems (e.g. Windows), and stubs supporting
4203 target extended-remote report it instead of a SIGSTOP
4204 (e.g. gdbserver). We already rely on SIGTRAP being our
4205 signal, so this is no exception.
4207 Also consider that the attach is complete when we see a
4208 GDB_SIGNAL_0. In non-stop mode, GDB will explicitly tell
4209 the target to stop all threads of the inferior, in case the
4210 low level attach operation doesn't stop them implicitly. If
4211 they weren't stopped implicitly, then the stub will report a
4212 GDB_SIGNAL_0, meaning: stopped for no particular reason
4213 other than GDB's request. */
4214 if (stop_soon
== STOP_QUIETLY_NO_SIGSTOP
4215 && (ecs
->event_thread
->suspend
.stop_signal
== GDB_SIGNAL_STOP
4216 || ecs
->event_thread
->suspend
.stop_signal
== GDB_SIGNAL_TRAP
4217 || ecs
->event_thread
->suspend
.stop_signal
== GDB_SIGNAL_0
))
4219 stop_stepping (ecs
);
4220 ecs
->event_thread
->suspend
.stop_signal
= GDB_SIGNAL_0
;
4224 /* See if there is a breakpoint/watchpoint/catchpoint/etc. that
4225 handles this event. */
4226 ecs
->event_thread
->control
.stop_bpstat
4227 = bpstat_stop_status (get_regcache_aspace (get_current_regcache ()),
4228 stop_pc
, ecs
->ptid
, &ecs
->ws
);
4230 /* Following in case break condition called a
4232 stop_print_frame
= 1;
4234 /* This is where we handle "moribund" watchpoints. Unlike
4235 software breakpoints traps, hardware watchpoint traps are
4236 always distinguishable from random traps. If no high-level
4237 watchpoint is associated with the reported stop data address
4238 anymore, then the bpstat does not explain the signal ---
4239 simply make sure to ignore it if `stopped_by_watchpoint' is
4243 && ecs
->event_thread
->suspend
.stop_signal
== GDB_SIGNAL_TRAP
4244 && (bpstat_explains_signal (ecs
->event_thread
->control
.stop_bpstat
,
4246 == BPSTAT_SIGNAL_NO
)
4247 && stopped_by_watchpoint
)
4248 fprintf_unfiltered (gdb_stdlog
,
4249 "infrun: no user watchpoint explains "
4250 "watchpoint SIGTRAP, ignoring\n");
4252 /* NOTE: cagney/2003-03-29: These two checks for a random signal
4253 at one stage in the past included checks for an inferior
4254 function call's call dummy's return breakpoint. The original
4255 comment, that went with the test, read:
4257 ``End of a stack dummy. Some systems (e.g. Sony news) give
4258 another signal besides SIGTRAP, so check here as well as
4261 If someone ever tries to get call dummys on a
4262 non-executable stack to work (where the target would stop
4263 with something like a SIGSEGV), then those tests might need
4264 to be re-instated. Given, however, that the tests were only
4265 enabled when momentary breakpoints were not being used, I
4266 suspect that it won't be the case.
4268 NOTE: kettenis/2004-02-05: Indeed such checks don't seem to
4269 be necessary for call dummies on a non-executable stack on
4272 if (ecs
->event_thread
->suspend
.stop_signal
== GDB_SIGNAL_TRAP
)
4274 = !((bpstat_explains_signal (ecs
->event_thread
->control
.stop_bpstat
,
4276 != BPSTAT_SIGNAL_NO
)
4277 || stopped_by_watchpoint
4278 || ecs
->event_thread
->control
.trap_expected
4279 || (ecs
->event_thread
->control
.step_range_end
4280 && (ecs
->event_thread
->control
.step_resume_breakpoint
4284 enum bpstat_signal_value sval
;
4286 sval
= bpstat_explains_signal (ecs
->event_thread
->control
.stop_bpstat
,
4287 ecs
->event_thread
->suspend
.stop_signal
);
4288 ecs
->random_signal
= (sval
== BPSTAT_SIGNAL_NO
);
4290 if (sval
== BPSTAT_SIGNAL_HIDE
)
4291 ecs
->event_thread
->suspend
.stop_signal
= GDB_SIGNAL_TRAP
;
4294 /* For the program's own signals, act according to
4295 the signal handling tables. */
4297 if (ecs
->random_signal
)
4299 /* Signal not for debugging purposes. */
4301 struct inferior
*inf
= find_inferior_pid (ptid_get_pid (ecs
->ptid
));
4302 enum gdb_signal stop_signal
= ecs
->event_thread
->suspend
.stop_signal
;
4305 fprintf_unfiltered (gdb_stdlog
, "infrun: random signal (%s)\n",
4306 gdb_signal_to_symbol_string (stop_signal
));
4308 stopped_by_random_signal
= 1;
4310 if (signal_print
[ecs
->event_thread
->suspend
.stop_signal
])
4313 target_terminal_ours_for_output ();
4314 print_signal_received_reason
4315 (ecs
->event_thread
->suspend
.stop_signal
);
4317 /* Always stop on signals if we're either just gaining control
4318 of the program, or the user explicitly requested this thread
4319 to remain stopped. */
4320 if (stop_soon
!= NO_STOP_QUIETLY
4321 || ecs
->event_thread
->stop_requested
4323 && signal_stop_state (ecs
->event_thread
->suspend
.stop_signal
)))
4325 stop_stepping (ecs
);
4328 /* If not going to stop, give terminal back
4329 if we took it away. */
4331 target_terminal_inferior ();
4333 /* Clear the signal if it should not be passed. */
4334 if (signal_program
[ecs
->event_thread
->suspend
.stop_signal
] == 0)
4335 ecs
->event_thread
->suspend
.stop_signal
= GDB_SIGNAL_0
;
4337 if (ecs
->event_thread
->prev_pc
== stop_pc
4338 && ecs
->event_thread
->control
.trap_expected
4339 && ecs
->event_thread
->control
.step_resume_breakpoint
== NULL
)
4341 /* We were just starting a new sequence, attempting to
4342 single-step off of a breakpoint and expecting a SIGTRAP.
4343 Instead this signal arrives. This signal will take us out
4344 of the stepping range so GDB needs to remember to, when
4345 the signal handler returns, resume stepping off that
4347 /* To simplify things, "continue" is forced to use the same
4348 code paths as single-step - set a breakpoint at the
4349 signal return address and then, once hit, step off that
4352 fprintf_unfiltered (gdb_stdlog
,
4353 "infrun: signal arrived while stepping over "
4356 insert_hp_step_resume_breakpoint_at_frame (frame
);
4357 ecs
->event_thread
->step_after_step_resume_breakpoint
= 1;
4358 /* Reset trap_expected to ensure breakpoints are re-inserted. */
4359 ecs
->event_thread
->control
.trap_expected
= 0;
4364 if (ecs
->event_thread
->control
.step_range_end
!= 0
4365 && ecs
->event_thread
->suspend
.stop_signal
!= GDB_SIGNAL_0
4366 && pc_in_thread_step_range (stop_pc
, ecs
->event_thread
)
4367 && frame_id_eq (get_stack_frame_id (frame
),
4368 ecs
->event_thread
->control
.step_stack_frame_id
)
4369 && ecs
->event_thread
->control
.step_resume_breakpoint
== NULL
)
4371 /* The inferior is about to take a signal that will take it
4372 out of the single step range. Set a breakpoint at the
4373 current PC (which is presumably where the signal handler
4374 will eventually return) and then allow the inferior to
4377 Note that this is only needed for a signal delivered
4378 while in the single-step range. Nested signals aren't a
4379 problem as they eventually all return. */
4381 fprintf_unfiltered (gdb_stdlog
,
4382 "infrun: signal may take us out of "
4383 "single-step range\n");
4385 insert_hp_step_resume_breakpoint_at_frame (frame
);
4386 /* Reset trap_expected to ensure breakpoints are re-inserted. */
4387 ecs
->event_thread
->control
.trap_expected
= 0;
4392 /* Note: step_resume_breakpoint may be non-NULL. This occures
4393 when either there's a nested signal, or when there's a
4394 pending signal enabled just as the signal handler returns
4395 (leaving the inferior at the step-resume-breakpoint without
4396 actually executing it). Either way continue until the
4397 breakpoint is really hit. */
4399 if (!switch_back_to_stepped_thread (ecs
))
4402 fprintf_unfiltered (gdb_stdlog
,
4403 "infrun: random signal, keep going\n");
4410 process_event_stop_test (ecs
);
4413 /* Come here when we've got some debug event / signal we can explain
4414 (IOW, not a random signal), and test whether it should cause a
4415 stop, or whether we should resume the inferior (transparently).
4416 E.g., could be a breakpoint whose condition evaluates false; we
4417 could be still stepping within the line; etc. */
4420 process_event_stop_test (struct execution_control_state
*ecs
)
4422 struct symtab_and_line stop_pc_sal
;
4423 struct frame_info
*frame
;
4424 struct gdbarch
*gdbarch
;
4425 CORE_ADDR jmp_buf_pc
;
4426 struct bpstat_what what
;
4428 /* Handle cases caused by hitting a breakpoint. */
4430 frame
= get_current_frame ();
4431 gdbarch
= get_frame_arch (frame
);
4433 what
= bpstat_what (ecs
->event_thread
->control
.stop_bpstat
);
4435 if (what
.call_dummy
)
4437 stop_stack_dummy
= what
.call_dummy
;
4440 /* If we hit an internal event that triggers symbol changes, the
4441 current frame will be invalidated within bpstat_what (e.g., if we
4442 hit an internal solib event). Re-fetch it. */
4443 frame
= get_current_frame ();
4444 gdbarch
= get_frame_arch (frame
);
4446 switch (what
.main_action
)
4448 case BPSTAT_WHAT_SET_LONGJMP_RESUME
:
4449 /* If we hit the breakpoint at longjmp while stepping, we
4450 install a momentary breakpoint at the target of the
4454 fprintf_unfiltered (gdb_stdlog
,
4455 "infrun: BPSTAT_WHAT_SET_LONGJMP_RESUME\n");
4457 ecs
->event_thread
->stepping_over_breakpoint
= 1;
4459 if (what
.is_longjmp
)
4461 struct value
*arg_value
;
4463 /* If we set the longjmp breakpoint via a SystemTap probe,
4464 then use it to extract the arguments. The destination PC
4465 is the third argument to the probe. */
4466 arg_value
= probe_safe_evaluate_at_pc (frame
, 2);
4468 jmp_buf_pc
= value_as_address (arg_value
);
4469 else if (!gdbarch_get_longjmp_target_p (gdbarch
)
4470 || !gdbarch_get_longjmp_target (gdbarch
,
4471 frame
, &jmp_buf_pc
))
4474 fprintf_unfiltered (gdb_stdlog
,
4475 "infrun: BPSTAT_WHAT_SET_LONGJMP_RESUME "
4476 "(!gdbarch_get_longjmp_target)\n");
4481 /* Insert a breakpoint at resume address. */
4482 insert_longjmp_resume_breakpoint (gdbarch
, jmp_buf_pc
);
4485 check_exception_resume (ecs
, frame
);
4489 case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME
:
4491 struct frame_info
*init_frame
;
4493 /* There are several cases to consider.
4495 1. The initiating frame no longer exists. In this case we
4496 must stop, because the exception or longjmp has gone too
4499 2. The initiating frame exists, and is the same as the
4500 current frame. We stop, because the exception or longjmp
4503 3. The initiating frame exists and is different from the
4504 current frame. This means the exception or longjmp has
4505 been caught beneath the initiating frame, so keep going.
4507 4. longjmp breakpoint has been placed just to protect
4508 against stale dummy frames and user is not interested in
4509 stopping around longjmps. */
4512 fprintf_unfiltered (gdb_stdlog
,
4513 "infrun: BPSTAT_WHAT_CLEAR_LONGJMP_RESUME\n");
4515 gdb_assert (ecs
->event_thread
->control
.exception_resume_breakpoint
4517 delete_exception_resume_breakpoint (ecs
->event_thread
);
4519 if (what
.is_longjmp
)
4521 check_longjmp_breakpoint_for_call_dummy (ecs
->event_thread
->num
);
4523 if (!frame_id_p (ecs
->event_thread
->initiating_frame
))
4531 init_frame
= frame_find_by_id (ecs
->event_thread
->initiating_frame
);
4535 struct frame_id current_id
4536 = get_frame_id (get_current_frame ());
4537 if (frame_id_eq (current_id
,
4538 ecs
->event_thread
->initiating_frame
))
4540 /* Case 2. Fall through. */
4550 /* For Cases 1 and 2, remove the step-resume breakpoint, if it
4552 delete_step_resume_breakpoint (ecs
->event_thread
);
4554 ecs
->event_thread
->control
.stop_step
= 1;
4555 print_end_stepping_range_reason ();
4556 stop_stepping (ecs
);
4560 case BPSTAT_WHAT_SINGLE
:
4562 fprintf_unfiltered (gdb_stdlog
, "infrun: BPSTAT_WHAT_SINGLE\n");
4563 ecs
->event_thread
->stepping_over_breakpoint
= 1;
4564 /* Still need to check other stuff, at least the case where we
4565 are stepping and step out of the right range. */
4568 case BPSTAT_WHAT_STEP_RESUME
:
4570 fprintf_unfiltered (gdb_stdlog
, "infrun: BPSTAT_WHAT_STEP_RESUME\n");
4572 delete_step_resume_breakpoint (ecs
->event_thread
);
4573 if (ecs
->event_thread
->control
.proceed_to_finish
4574 && execution_direction
== EXEC_REVERSE
)
4576 struct thread_info
*tp
= ecs
->event_thread
;
4578 /* We are finishing a function in reverse, and just hit the
4579 step-resume breakpoint at the start address of the
4580 function, and we're almost there -- just need to back up
4581 by one more single-step, which should take us back to the
4583 tp
->control
.step_range_start
= tp
->control
.step_range_end
= 1;
4587 fill_in_stop_func (gdbarch
, ecs
);
4588 if (stop_pc
== ecs
->stop_func_start
4589 && execution_direction
== EXEC_REVERSE
)
4591 /* We are stepping over a function call in reverse, and just
4592 hit the step-resume breakpoint at the start address of
4593 the function. Go back to single-stepping, which should
4594 take us back to the function call. */
4595 ecs
->event_thread
->stepping_over_breakpoint
= 1;
4601 case BPSTAT_WHAT_STOP_NOISY
:
4603 fprintf_unfiltered (gdb_stdlog
, "infrun: BPSTAT_WHAT_STOP_NOISY\n");
4604 stop_print_frame
= 1;
4606 /* We are about to nuke the step_resume_breakpointt via the
4607 cleanup chain, so no need to worry about it here. */
4609 stop_stepping (ecs
);
4612 case BPSTAT_WHAT_STOP_SILENT
:
4614 fprintf_unfiltered (gdb_stdlog
, "infrun: BPSTAT_WHAT_STOP_SILENT\n");
4615 stop_print_frame
= 0;
4617 /* We are about to nuke the step_resume_breakpoin via the
4618 cleanup chain, so no need to worry about it here. */
4620 stop_stepping (ecs
);
4623 case BPSTAT_WHAT_HP_STEP_RESUME
:
4625 fprintf_unfiltered (gdb_stdlog
, "infrun: BPSTAT_WHAT_HP_STEP_RESUME\n");
4627 delete_step_resume_breakpoint (ecs
->event_thread
);
4628 if (ecs
->event_thread
->step_after_step_resume_breakpoint
)
4630 /* Back when the step-resume breakpoint was inserted, we
4631 were trying to single-step off a breakpoint. Go back to
4633 ecs
->event_thread
->step_after_step_resume_breakpoint
= 0;
4634 ecs
->event_thread
->stepping_over_breakpoint
= 1;
4640 case BPSTAT_WHAT_KEEP_CHECKING
:
4644 /* We come here if we hit a breakpoint but should not stop for it.
4645 Possibly we also were stepping and should stop for that. So fall
4646 through and test for stepping. But, if not stepping, do not
4649 /* In all-stop mode, if we're currently stepping but have stopped in
4650 some other thread, we need to switch back to the stepped thread. */
4651 if (switch_back_to_stepped_thread (ecs
))
4654 if (ecs
->event_thread
->control
.step_resume_breakpoint
)
4657 fprintf_unfiltered (gdb_stdlog
,
4658 "infrun: step-resume breakpoint is inserted\n");
4660 /* Having a step-resume breakpoint overrides anything
4661 else having to do with stepping commands until
4662 that breakpoint is reached. */
4667 if (ecs
->event_thread
->control
.step_range_end
== 0)
4670 fprintf_unfiltered (gdb_stdlog
, "infrun: no stepping, continue\n");
4671 /* Likewise if we aren't even stepping. */
4676 /* Re-fetch current thread's frame in case the code above caused
4677 the frame cache to be re-initialized, making our FRAME variable
4678 a dangling pointer. */
4679 frame
= get_current_frame ();
4680 gdbarch
= get_frame_arch (frame
);
4681 fill_in_stop_func (gdbarch
, ecs
);
4683 /* If stepping through a line, keep going if still within it.
4685 Note that step_range_end is the address of the first instruction
4686 beyond the step range, and NOT the address of the last instruction
4689 Note also that during reverse execution, we may be stepping
4690 through a function epilogue and therefore must detect when
4691 the current-frame changes in the middle of a line. */
4693 if (pc_in_thread_step_range (stop_pc
, ecs
->event_thread
)
4694 && (execution_direction
!= EXEC_REVERSE
4695 || frame_id_eq (get_frame_id (frame
),
4696 ecs
->event_thread
->control
.step_frame_id
)))
4700 (gdb_stdlog
, "infrun: stepping inside range [%s-%s]\n",
4701 paddress (gdbarch
, ecs
->event_thread
->control
.step_range_start
),
4702 paddress (gdbarch
, ecs
->event_thread
->control
.step_range_end
));
4704 /* Tentatively re-enable range stepping; `resume' disables it if
4705 necessary (e.g., if we're stepping over a breakpoint or we
4706 have software watchpoints). */
4707 ecs
->event_thread
->control
.may_range_step
= 1;
4709 /* When stepping backward, stop at beginning of line range
4710 (unless it's the function entry point, in which case
4711 keep going back to the call point). */
4712 if (stop_pc
== ecs
->event_thread
->control
.step_range_start
4713 && stop_pc
!= ecs
->stop_func_start
4714 && execution_direction
== EXEC_REVERSE
)
4716 ecs
->event_thread
->control
.stop_step
= 1;
4717 print_end_stepping_range_reason ();
4718 stop_stepping (ecs
);
4726 /* We stepped out of the stepping range. */
4728 /* If we are stepping at the source level and entered the runtime
4729 loader dynamic symbol resolution code...
4731 EXEC_FORWARD: we keep on single stepping until we exit the run
4732 time loader code and reach the callee's address.
4734 EXEC_REVERSE: we've already executed the callee (backward), and
4735 the runtime loader code is handled just like any other
4736 undebuggable function call. Now we need only keep stepping
4737 backward through the trampoline code, and that's handled further
4738 down, so there is nothing for us to do here. */
4740 if (execution_direction
!= EXEC_REVERSE
4741 && ecs
->event_thread
->control
.step_over_calls
== STEP_OVER_UNDEBUGGABLE
4742 && in_solib_dynsym_resolve_code (stop_pc
))
4744 CORE_ADDR pc_after_resolver
=
4745 gdbarch_skip_solib_resolver (gdbarch
, stop_pc
);
4748 fprintf_unfiltered (gdb_stdlog
,
4749 "infrun: stepped into dynsym resolve code\n");
4751 if (pc_after_resolver
)
4753 /* Set up a step-resume breakpoint at the address
4754 indicated by SKIP_SOLIB_RESOLVER. */
4755 struct symtab_and_line sr_sal
;
4758 sr_sal
.pc
= pc_after_resolver
;
4759 sr_sal
.pspace
= get_frame_program_space (frame
);
4761 insert_step_resume_breakpoint_at_sal (gdbarch
,
4762 sr_sal
, null_frame_id
);
4769 if (ecs
->event_thread
->control
.step_range_end
!= 1
4770 && (ecs
->event_thread
->control
.step_over_calls
== STEP_OVER_UNDEBUGGABLE
4771 || ecs
->event_thread
->control
.step_over_calls
== STEP_OVER_ALL
)
4772 && get_frame_type (frame
) == SIGTRAMP_FRAME
)
4775 fprintf_unfiltered (gdb_stdlog
,
4776 "infrun: stepped into signal trampoline\n");
4777 /* The inferior, while doing a "step" or "next", has ended up in
4778 a signal trampoline (either by a signal being delivered or by
4779 the signal handler returning). Just single-step until the
4780 inferior leaves the trampoline (either by calling the handler
4786 /* If we're in the return path from a shared library trampoline,
4787 we want to proceed through the trampoline when stepping. */
4788 /* macro/2012-04-25: This needs to come before the subroutine
4789 call check below as on some targets return trampolines look
4790 like subroutine calls (MIPS16 return thunks). */
4791 if (gdbarch_in_solib_return_trampoline (gdbarch
,
4792 stop_pc
, ecs
->stop_func_name
)
4793 && ecs
->event_thread
->control
.step_over_calls
!= STEP_OVER_NONE
)
4795 /* Determine where this trampoline returns. */
4796 CORE_ADDR real_stop_pc
;
4798 real_stop_pc
= gdbarch_skip_trampoline_code (gdbarch
, frame
, stop_pc
);
4801 fprintf_unfiltered (gdb_stdlog
,
4802 "infrun: stepped into solib return tramp\n");
4804 /* Only proceed through if we know where it's going. */
4807 /* And put the step-breakpoint there and go until there. */
4808 struct symtab_and_line sr_sal
;
4810 init_sal (&sr_sal
); /* initialize to zeroes */
4811 sr_sal
.pc
= real_stop_pc
;
4812 sr_sal
.section
= find_pc_overlay (sr_sal
.pc
);
4813 sr_sal
.pspace
= get_frame_program_space (frame
);
4815 /* Do not specify what the fp should be when we stop since
4816 on some machines the prologue is where the new fp value
4818 insert_step_resume_breakpoint_at_sal (gdbarch
,
4819 sr_sal
, null_frame_id
);
4821 /* Restart without fiddling with the step ranges or
4828 /* Check for subroutine calls. The check for the current frame
4829 equalling the step ID is not necessary - the check of the
4830 previous frame's ID is sufficient - but it is a common case and
4831 cheaper than checking the previous frame's ID.
4833 NOTE: frame_id_eq will never report two invalid frame IDs as
4834 being equal, so to get into this block, both the current and
4835 previous frame must have valid frame IDs. */
4836 /* The outer_frame_id check is a heuristic to detect stepping
4837 through startup code. If we step over an instruction which
4838 sets the stack pointer from an invalid value to a valid value,
4839 we may detect that as a subroutine call from the mythical
4840 "outermost" function. This could be fixed by marking
4841 outermost frames as !stack_p,code_p,special_p. Then the
4842 initial outermost frame, before sp was valid, would
4843 have code_addr == &_start. See the comment in frame_id_eq
4845 if (!frame_id_eq (get_stack_frame_id (frame
),
4846 ecs
->event_thread
->control
.step_stack_frame_id
)
4847 && (frame_id_eq (frame_unwind_caller_id (get_current_frame ()),
4848 ecs
->event_thread
->control
.step_stack_frame_id
)
4849 && (!frame_id_eq (ecs
->event_thread
->control
.step_stack_frame_id
,
4851 || step_start_function
!= find_pc_function (stop_pc
))))
4853 CORE_ADDR real_stop_pc
;
4856 fprintf_unfiltered (gdb_stdlog
, "infrun: stepped into subroutine\n");
4858 if ((ecs
->event_thread
->control
.step_over_calls
== STEP_OVER_NONE
)
4859 || ((ecs
->event_thread
->control
.step_range_end
== 1)
4860 && in_prologue (gdbarch
, ecs
->event_thread
->prev_pc
,
4861 ecs
->stop_func_start
)))
4863 /* I presume that step_over_calls is only 0 when we're
4864 supposed to be stepping at the assembly language level
4865 ("stepi"). Just stop. */
4866 /* Also, maybe we just did a "nexti" inside a prolog, so we
4867 thought it was a subroutine call but it was not. Stop as
4869 /* And this works the same backward as frontward. MVS */
4870 ecs
->event_thread
->control
.stop_step
= 1;
4871 print_end_stepping_range_reason ();
4872 stop_stepping (ecs
);
4876 /* Reverse stepping through solib trampolines. */
4878 if (execution_direction
== EXEC_REVERSE
4879 && ecs
->event_thread
->control
.step_over_calls
!= STEP_OVER_NONE
4880 && (gdbarch_skip_trampoline_code (gdbarch
, frame
, stop_pc
)
4881 || (ecs
->stop_func_start
== 0
4882 && in_solib_dynsym_resolve_code (stop_pc
))))
4884 /* Any solib trampoline code can be handled in reverse
4885 by simply continuing to single-step. We have already
4886 executed the solib function (backwards), and a few
4887 steps will take us back through the trampoline to the
4893 if (ecs
->event_thread
->control
.step_over_calls
== STEP_OVER_ALL
)
4895 /* We're doing a "next".
4897 Normal (forward) execution: set a breakpoint at the
4898 callee's return address (the address at which the caller
4901 Reverse (backward) execution. set the step-resume
4902 breakpoint at the start of the function that we just
4903 stepped into (backwards), and continue to there. When we
4904 get there, we'll need to single-step back to the caller. */
4906 if (execution_direction
== EXEC_REVERSE
)
4908 /* If we're already at the start of the function, we've either
4909 just stepped backward into a single instruction function,
4910 or stepped back out of a signal handler to the first instruction
4911 of the function. Just keep going, which will single-step back
4913 if (ecs
->stop_func_start
!= stop_pc
&& ecs
->stop_func_start
!= 0)
4915 struct symtab_and_line sr_sal
;
4917 /* Normal function call return (static or dynamic). */
4919 sr_sal
.pc
= ecs
->stop_func_start
;
4920 sr_sal
.pspace
= get_frame_program_space (frame
);
4921 insert_step_resume_breakpoint_at_sal (gdbarch
,
4922 sr_sal
, null_frame_id
);
4926 insert_step_resume_breakpoint_at_caller (frame
);
4932 /* If we are in a function call trampoline (a stub between the
4933 calling routine and the real function), locate the real
4934 function. That's what tells us (a) whether we want to step
4935 into it at all, and (b) what prologue we want to run to the
4936 end of, if we do step into it. */
4937 real_stop_pc
= skip_language_trampoline (frame
, stop_pc
);
4938 if (real_stop_pc
== 0)
4939 real_stop_pc
= gdbarch_skip_trampoline_code (gdbarch
, frame
, stop_pc
);
4940 if (real_stop_pc
!= 0)
4941 ecs
->stop_func_start
= real_stop_pc
;
4943 if (real_stop_pc
!= 0 && in_solib_dynsym_resolve_code (real_stop_pc
))
4945 struct symtab_and_line sr_sal
;
4948 sr_sal
.pc
= ecs
->stop_func_start
;
4949 sr_sal
.pspace
= get_frame_program_space (frame
);
4951 insert_step_resume_breakpoint_at_sal (gdbarch
,
4952 sr_sal
, null_frame_id
);
4957 /* If we have line number information for the function we are
4958 thinking of stepping into and the function isn't on the skip
4961 If there are several symtabs at that PC (e.g. with include
4962 files), just want to know whether *any* of them have line
4963 numbers. find_pc_line handles this. */
4965 struct symtab_and_line tmp_sal
;
4967 tmp_sal
= find_pc_line (ecs
->stop_func_start
, 0);
4968 if (tmp_sal
.line
!= 0
4969 && !function_name_is_marked_for_skip (ecs
->stop_func_name
,
4972 if (execution_direction
== EXEC_REVERSE
)
4973 handle_step_into_function_backward (gdbarch
, ecs
);
4975 handle_step_into_function (gdbarch
, ecs
);
4980 /* If we have no line number and the step-stop-if-no-debug is
4981 set, we stop the step so that the user has a chance to switch
4982 in assembly mode. */
4983 if (ecs
->event_thread
->control
.step_over_calls
== STEP_OVER_UNDEBUGGABLE
4984 && step_stop_if_no_debug
)
4986 ecs
->event_thread
->control
.stop_step
= 1;
4987 print_end_stepping_range_reason ();
4988 stop_stepping (ecs
);
4992 if (execution_direction
== EXEC_REVERSE
)
4994 /* If we're already at the start of the function, we've either just
4995 stepped backward into a single instruction function without line
4996 number info, or stepped back out of a signal handler to the first
4997 instruction of the function without line number info. Just keep
4998 going, which will single-step back to the caller. */
4999 if (ecs
->stop_func_start
!= stop_pc
)
5001 /* Set a breakpoint at callee's start address.
5002 From there we can step once and be back in the caller. */
5003 struct symtab_and_line sr_sal
;
5006 sr_sal
.pc
= ecs
->stop_func_start
;
5007 sr_sal
.pspace
= get_frame_program_space (frame
);
5008 insert_step_resume_breakpoint_at_sal (gdbarch
,
5009 sr_sal
, null_frame_id
);
5013 /* Set a breakpoint at callee's return address (the address
5014 at which the caller will resume). */
5015 insert_step_resume_breakpoint_at_caller (frame
);
5021 /* Reverse stepping through solib trampolines. */
5023 if (execution_direction
== EXEC_REVERSE
5024 && ecs
->event_thread
->control
.step_over_calls
!= STEP_OVER_NONE
)
5026 if (gdbarch_skip_trampoline_code (gdbarch
, frame
, stop_pc
)
5027 || (ecs
->stop_func_start
== 0
5028 && in_solib_dynsym_resolve_code (stop_pc
)))
5030 /* Any solib trampoline code can be handled in reverse
5031 by simply continuing to single-step. We have already
5032 executed the solib function (backwards), and a few
5033 steps will take us back through the trampoline to the
5038 else if (in_solib_dynsym_resolve_code (stop_pc
))
5040 /* Stepped backward into the solib dynsym resolver.
5041 Set a breakpoint at its start and continue, then
5042 one more step will take us out. */
5043 struct symtab_and_line sr_sal
;
5046 sr_sal
.pc
= ecs
->stop_func_start
;
5047 sr_sal
.pspace
= get_frame_program_space (frame
);
5048 insert_step_resume_breakpoint_at_sal (gdbarch
,
5049 sr_sal
, null_frame_id
);
5055 stop_pc_sal
= find_pc_line (stop_pc
, 0);
5057 /* NOTE: tausq/2004-05-24: This if block used to be done before all
5058 the trampoline processing logic, however, there are some trampolines
5059 that have no names, so we should do trampoline handling first. */
5060 if (ecs
->event_thread
->control
.step_over_calls
== STEP_OVER_UNDEBUGGABLE
5061 && ecs
->stop_func_name
== NULL
5062 && stop_pc_sal
.line
== 0)
5065 fprintf_unfiltered (gdb_stdlog
,
5066 "infrun: stepped into undebuggable function\n");
5068 /* The inferior just stepped into, or returned to, an
5069 undebuggable function (where there is no debugging information
5070 and no line number corresponding to the address where the
5071 inferior stopped). Since we want to skip this kind of code,
5072 we keep going until the inferior returns from this
5073 function - unless the user has asked us not to (via
5074 set step-mode) or we no longer know how to get back
5075 to the call site. */
5076 if (step_stop_if_no_debug
5077 || !frame_id_p (frame_unwind_caller_id (frame
)))
5079 /* If we have no line number and the step-stop-if-no-debug
5080 is set, we stop the step so that the user has a chance to
5081 switch in assembly mode. */
5082 ecs
->event_thread
->control
.stop_step
= 1;
5083 print_end_stepping_range_reason ();
5084 stop_stepping (ecs
);
5089 /* Set a breakpoint at callee's return address (the address
5090 at which the caller will resume). */
5091 insert_step_resume_breakpoint_at_caller (frame
);
5097 if (ecs
->event_thread
->control
.step_range_end
== 1)
5099 /* It is stepi or nexti. We always want to stop stepping after
5102 fprintf_unfiltered (gdb_stdlog
, "infrun: stepi/nexti\n");
5103 ecs
->event_thread
->control
.stop_step
= 1;
5104 print_end_stepping_range_reason ();
5105 stop_stepping (ecs
);
5109 if (stop_pc_sal
.line
== 0)
5111 /* We have no line number information. That means to stop
5112 stepping (does this always happen right after one instruction,
5113 when we do "s" in a function with no line numbers,
5114 or can this happen as a result of a return or longjmp?). */
5116 fprintf_unfiltered (gdb_stdlog
, "infrun: no line number info\n");
5117 ecs
->event_thread
->control
.stop_step
= 1;
5118 print_end_stepping_range_reason ();
5119 stop_stepping (ecs
);
5123 /* Look for "calls" to inlined functions, part one. If the inline
5124 frame machinery detected some skipped call sites, we have entered
5125 a new inline function. */
5127 if (frame_id_eq (get_frame_id (get_current_frame ()),
5128 ecs
->event_thread
->control
.step_frame_id
)
5129 && inline_skipped_frames (ecs
->ptid
))
5131 struct symtab_and_line call_sal
;
5134 fprintf_unfiltered (gdb_stdlog
,
5135 "infrun: stepped into inlined function\n");
5137 find_frame_sal (get_current_frame (), &call_sal
);
5139 if (ecs
->event_thread
->control
.step_over_calls
!= STEP_OVER_ALL
)
5141 /* For "step", we're going to stop. But if the call site
5142 for this inlined function is on the same source line as
5143 we were previously stepping, go down into the function
5144 first. Otherwise stop at the call site. */
5146 if (call_sal
.line
== ecs
->event_thread
->current_line
5147 && call_sal
.symtab
== ecs
->event_thread
->current_symtab
)
5148 step_into_inline_frame (ecs
->ptid
);
5150 ecs
->event_thread
->control
.stop_step
= 1;
5151 print_end_stepping_range_reason ();
5152 stop_stepping (ecs
);
5157 /* For "next", we should stop at the call site if it is on a
5158 different source line. Otherwise continue through the
5159 inlined function. */
5160 if (call_sal
.line
== ecs
->event_thread
->current_line
5161 && call_sal
.symtab
== ecs
->event_thread
->current_symtab
)
5165 ecs
->event_thread
->control
.stop_step
= 1;
5166 print_end_stepping_range_reason ();
5167 stop_stepping (ecs
);
5173 /* Look for "calls" to inlined functions, part two. If we are still
5174 in the same real function we were stepping through, but we have
5175 to go further up to find the exact frame ID, we are stepping
5176 through a more inlined call beyond its call site. */
5178 if (get_frame_type (get_current_frame ()) == INLINE_FRAME
5179 && !frame_id_eq (get_frame_id (get_current_frame ()),
5180 ecs
->event_thread
->control
.step_frame_id
)
5181 && stepped_in_from (get_current_frame (),
5182 ecs
->event_thread
->control
.step_frame_id
))
5185 fprintf_unfiltered (gdb_stdlog
,
5186 "infrun: stepping through inlined function\n");
5188 if (ecs
->event_thread
->control
.step_over_calls
== STEP_OVER_ALL
)
5192 ecs
->event_thread
->control
.stop_step
= 1;
5193 print_end_stepping_range_reason ();
5194 stop_stepping (ecs
);
5199 if ((stop_pc
== stop_pc_sal
.pc
)
5200 && (ecs
->event_thread
->current_line
!= stop_pc_sal
.line
5201 || ecs
->event_thread
->current_symtab
!= stop_pc_sal
.symtab
))
5203 /* We are at the start of a different line. So stop. Note that
5204 we don't stop if we step into the middle of a different line.
5205 That is said to make things like for (;;) statements work
5208 fprintf_unfiltered (gdb_stdlog
,
5209 "infrun: stepped to a different line\n");
5210 ecs
->event_thread
->control
.stop_step
= 1;
5211 print_end_stepping_range_reason ();
5212 stop_stepping (ecs
);
5216 /* We aren't done stepping.
5218 Optimize by setting the stepping range to the line.
5219 (We might not be in the original line, but if we entered a
5220 new line in mid-statement, we continue stepping. This makes
5221 things like for(;;) statements work better.) */
5223 ecs
->event_thread
->control
.step_range_start
= stop_pc_sal
.pc
;
5224 ecs
->event_thread
->control
.step_range_end
= stop_pc_sal
.end
;
5225 ecs
->event_thread
->control
.may_range_step
= 1;
5226 set_step_info (frame
, stop_pc_sal
);
5229 fprintf_unfiltered (gdb_stdlog
, "infrun: keep going\n");
5233 /* In all-stop mode, if we're currently stepping but have stopped in
5234 some other thread, we may need to switch back to the stepped
5235 thread. Returns true we set the inferior running, false if we left
5236 it stopped (and the event needs further processing). */
5239 switch_back_to_stepped_thread (struct execution_control_state
*ecs
)
5243 struct thread_info
*tp
;
5245 tp
= iterate_over_threads (currently_stepping_or_nexting_callback
,
5249 /* However, if the current thread is blocked on some internal
5250 breakpoint, and we simply need to step over that breakpoint
5251 to get it going again, do that first. */
5252 if ((ecs
->event_thread
->control
.trap_expected
5253 && ecs
->event_thread
->suspend
.stop_signal
!= GDB_SIGNAL_TRAP
)
5254 || ecs
->event_thread
->stepping_over_breakpoint
)
5260 /* If the stepping thread exited, then don't try to switch
5261 back and resume it, which could fail in several different
5262 ways depending on the target. Instead, just keep going.
5264 We can find a stepping dead thread in the thread list in
5267 - The target supports thread exit events, and when the
5268 target tries to delete the thread from the thread list,
5269 inferior_ptid pointed at the exiting thread. In such
5270 case, calling delete_thread does not really remove the
5271 thread from the list; instead, the thread is left listed,
5272 with 'exited' state.
5274 - The target's debug interface does not support thread
5275 exit events, and so we have no idea whatsoever if the
5276 previously stepping thread is still alive. For that
5277 reason, we need to synchronously query the target
5279 if (is_exited (tp
->ptid
)
5280 || !target_thread_alive (tp
->ptid
))
5283 fprintf_unfiltered (gdb_stdlog
,
5284 "infrun: not switching back to "
5285 "stepped thread, it has vanished\n");
5287 delete_thread (tp
->ptid
);
5292 /* Otherwise, we no longer expect a trap in the current thread.
5293 Clear the trap_expected flag before switching back -- this is
5294 what keep_going would do as well, if we called it. */
5295 ecs
->event_thread
->control
.trap_expected
= 0;
5298 fprintf_unfiltered (gdb_stdlog
,
5299 "infrun: switching back to stepped thread\n");
5301 ecs
->event_thread
= tp
;
5302 ecs
->ptid
= tp
->ptid
;
5303 context_switch (ecs
->ptid
);
5311 /* Is thread TP in the middle of single-stepping? */
5314 currently_stepping (struct thread_info
*tp
)
5316 return ((tp
->control
.step_range_end
5317 && tp
->control
.step_resume_breakpoint
== NULL
)
5318 || tp
->control
.trap_expected
5319 || bpstat_should_step ());
5322 /* Returns true if any thread *but* the one passed in "data" is in the
5323 middle of stepping or of handling a "next". */
5326 currently_stepping_or_nexting_callback (struct thread_info
*tp
, void *data
)
5331 return (tp
->control
.step_range_end
5332 || tp
->control
.trap_expected
);
5335 /* Inferior has stepped into a subroutine call with source code that
5336 we should not step over. Do step to the first line of code in
5340 handle_step_into_function (struct gdbarch
*gdbarch
,
5341 struct execution_control_state
*ecs
)
5344 struct symtab_and_line stop_func_sal
, sr_sal
;
5346 fill_in_stop_func (gdbarch
, ecs
);
5348 s
= find_pc_symtab (stop_pc
);
5349 if (s
&& s
->language
!= language_asm
)
5350 ecs
->stop_func_start
= gdbarch_skip_prologue (gdbarch
,
5351 ecs
->stop_func_start
);
5353 stop_func_sal
= find_pc_line (ecs
->stop_func_start
, 0);
5354 /* Use the step_resume_break to step until the end of the prologue,
5355 even if that involves jumps (as it seems to on the vax under
5357 /* If the prologue ends in the middle of a source line, continue to
5358 the end of that source line (if it is still within the function).
5359 Otherwise, just go to end of prologue. */
5360 if (stop_func_sal
.end
5361 && stop_func_sal
.pc
!= ecs
->stop_func_start
5362 && stop_func_sal
.end
< ecs
->stop_func_end
)
5363 ecs
->stop_func_start
= stop_func_sal
.end
;
5365 /* Architectures which require breakpoint adjustment might not be able
5366 to place a breakpoint at the computed address. If so, the test
5367 ``ecs->stop_func_start == stop_pc'' will never succeed. Adjust
5368 ecs->stop_func_start to an address at which a breakpoint may be
5369 legitimately placed.
5371 Note: kevinb/2004-01-19: On FR-V, if this adjustment is not
5372 made, GDB will enter an infinite loop when stepping through
5373 optimized code consisting of VLIW instructions which contain
5374 subinstructions corresponding to different source lines. On
5375 FR-V, it's not permitted to place a breakpoint on any but the
5376 first subinstruction of a VLIW instruction. When a breakpoint is
5377 set, GDB will adjust the breakpoint address to the beginning of
5378 the VLIW instruction. Thus, we need to make the corresponding
5379 adjustment here when computing the stop address. */
5381 if (gdbarch_adjust_breakpoint_address_p (gdbarch
))
5383 ecs
->stop_func_start
5384 = gdbarch_adjust_breakpoint_address (gdbarch
,
5385 ecs
->stop_func_start
);
5388 if (ecs
->stop_func_start
== stop_pc
)
5390 /* We are already there: stop now. */
5391 ecs
->event_thread
->control
.stop_step
= 1;
5392 print_end_stepping_range_reason ();
5393 stop_stepping (ecs
);
5398 /* Put the step-breakpoint there and go until there. */
5399 init_sal (&sr_sal
); /* initialize to zeroes */
5400 sr_sal
.pc
= ecs
->stop_func_start
;
5401 sr_sal
.section
= find_pc_overlay (ecs
->stop_func_start
);
5402 sr_sal
.pspace
= get_frame_program_space (get_current_frame ());
5404 /* Do not specify what the fp should be when we stop since on
5405 some machines the prologue is where the new fp value is
5407 insert_step_resume_breakpoint_at_sal (gdbarch
, sr_sal
, null_frame_id
);
5409 /* And make sure stepping stops right away then. */
5410 ecs
->event_thread
->control
.step_range_end
5411 = ecs
->event_thread
->control
.step_range_start
;
5416 /* Inferior has stepped backward into a subroutine call with source
5417 code that we should not step over. Do step to the beginning of the
5418 last line of code in it. */
5421 handle_step_into_function_backward (struct gdbarch
*gdbarch
,
5422 struct execution_control_state
*ecs
)
5425 struct symtab_and_line stop_func_sal
;
5427 fill_in_stop_func (gdbarch
, ecs
);
5429 s
= find_pc_symtab (stop_pc
);
5430 if (s
&& s
->language
!= language_asm
)
5431 ecs
->stop_func_start
= gdbarch_skip_prologue (gdbarch
,
5432 ecs
->stop_func_start
);
5434 stop_func_sal
= find_pc_line (stop_pc
, 0);
5436 /* OK, we're just going to keep stepping here. */
5437 if (stop_func_sal
.pc
== stop_pc
)
5439 /* We're there already. Just stop stepping now. */
5440 ecs
->event_thread
->control
.stop_step
= 1;
5441 print_end_stepping_range_reason ();
5442 stop_stepping (ecs
);
5446 /* Else just reset the step range and keep going.
5447 No step-resume breakpoint, they don't work for
5448 epilogues, which can have multiple entry paths. */
5449 ecs
->event_thread
->control
.step_range_start
= stop_func_sal
.pc
;
5450 ecs
->event_thread
->control
.step_range_end
= stop_func_sal
.end
;
5456 /* Insert a "step-resume breakpoint" at SR_SAL with frame ID SR_ID.
5457 This is used to both functions and to skip over code. */
5460 insert_step_resume_breakpoint_at_sal_1 (struct gdbarch
*gdbarch
,
5461 struct symtab_and_line sr_sal
,
5462 struct frame_id sr_id
,
5463 enum bptype sr_type
)
5465 /* There should never be more than one step-resume or longjmp-resume
5466 breakpoint per thread, so we should never be setting a new
5467 step_resume_breakpoint when one is already active. */
5468 gdb_assert (inferior_thread ()->control
.step_resume_breakpoint
== NULL
);
5469 gdb_assert (sr_type
== bp_step_resume
|| sr_type
== bp_hp_step_resume
);
5472 fprintf_unfiltered (gdb_stdlog
,
5473 "infrun: inserting step-resume breakpoint at %s\n",
5474 paddress (gdbarch
, sr_sal
.pc
));
5476 inferior_thread ()->control
.step_resume_breakpoint
5477 = set_momentary_breakpoint (gdbarch
, sr_sal
, sr_id
, sr_type
);
5481 insert_step_resume_breakpoint_at_sal (struct gdbarch
*gdbarch
,
5482 struct symtab_and_line sr_sal
,
5483 struct frame_id sr_id
)
5485 insert_step_resume_breakpoint_at_sal_1 (gdbarch
,
5490 /* Insert a "high-priority step-resume breakpoint" at RETURN_FRAME.pc.
5491 This is used to skip a potential signal handler.
5493 This is called with the interrupted function's frame. The signal
5494 handler, when it returns, will resume the interrupted function at
5498 insert_hp_step_resume_breakpoint_at_frame (struct frame_info
*return_frame
)
5500 struct symtab_and_line sr_sal
;
5501 struct gdbarch
*gdbarch
;
5503 gdb_assert (return_frame
!= NULL
);
5504 init_sal (&sr_sal
); /* initialize to zeros */
5506 gdbarch
= get_frame_arch (return_frame
);
5507 sr_sal
.pc
= gdbarch_addr_bits_remove (gdbarch
, get_frame_pc (return_frame
));
5508 sr_sal
.section
= find_pc_overlay (sr_sal
.pc
);
5509 sr_sal
.pspace
= get_frame_program_space (return_frame
);
5511 insert_step_resume_breakpoint_at_sal_1 (gdbarch
, sr_sal
,
5512 get_stack_frame_id (return_frame
),
5516 /* Insert a "step-resume breakpoint" at the previous frame's PC. This
5517 is used to skip a function after stepping into it (for "next" or if
5518 the called function has no debugging information).
5520 The current function has almost always been reached by single
5521 stepping a call or return instruction. NEXT_FRAME belongs to the
5522 current function, and the breakpoint will be set at the caller's
5525 This is a separate function rather than reusing
5526 insert_hp_step_resume_breakpoint_at_frame in order to avoid
5527 get_prev_frame, which may stop prematurely (see the implementation
5528 of frame_unwind_caller_id for an example). */
5531 insert_step_resume_breakpoint_at_caller (struct frame_info
*next_frame
)
5533 struct symtab_and_line sr_sal
;
5534 struct gdbarch
*gdbarch
;
5536 /* We shouldn't have gotten here if we don't know where the call site
5538 gdb_assert (frame_id_p (frame_unwind_caller_id (next_frame
)));
5540 init_sal (&sr_sal
); /* initialize to zeros */
5542 gdbarch
= frame_unwind_caller_arch (next_frame
);
5543 sr_sal
.pc
= gdbarch_addr_bits_remove (gdbarch
,
5544 frame_unwind_caller_pc (next_frame
));
5545 sr_sal
.section
= find_pc_overlay (sr_sal
.pc
);
5546 sr_sal
.pspace
= frame_unwind_program_space (next_frame
);
5548 insert_step_resume_breakpoint_at_sal (gdbarch
, sr_sal
,
5549 frame_unwind_caller_id (next_frame
));
5552 /* Insert a "longjmp-resume" breakpoint at PC. This is used to set a
5553 new breakpoint at the target of a jmp_buf. The handling of
5554 longjmp-resume uses the same mechanisms used for handling
5555 "step-resume" breakpoints. */
5558 insert_longjmp_resume_breakpoint (struct gdbarch
*gdbarch
, CORE_ADDR pc
)
5560 /* There should never be more than one longjmp-resume breakpoint per
5561 thread, so we should never be setting a new
5562 longjmp_resume_breakpoint when one is already active. */
5563 gdb_assert (inferior_thread ()->control
.exception_resume_breakpoint
== NULL
);
5566 fprintf_unfiltered (gdb_stdlog
,
5567 "infrun: inserting longjmp-resume breakpoint at %s\n",
5568 paddress (gdbarch
, pc
));
5570 inferior_thread ()->control
.exception_resume_breakpoint
=
5571 set_momentary_breakpoint_at_pc (gdbarch
, pc
, bp_longjmp_resume
);
5574 /* Insert an exception resume breakpoint. TP is the thread throwing
5575 the exception. The block B is the block of the unwinder debug hook
5576 function. FRAME is the frame corresponding to the call to this
5577 function. SYM is the symbol of the function argument holding the
5578 target PC of the exception. */
5581 insert_exception_resume_breakpoint (struct thread_info
*tp
,
5583 struct frame_info
*frame
,
5586 volatile struct gdb_exception e
;
5588 /* We want to ignore errors here. */
5589 TRY_CATCH (e
, RETURN_MASK_ERROR
)
5591 struct symbol
*vsym
;
5592 struct value
*value
;
5594 struct breakpoint
*bp
;
5596 vsym
= lookup_symbol (SYMBOL_LINKAGE_NAME (sym
), b
, VAR_DOMAIN
, NULL
);
5597 value
= read_var_value (vsym
, frame
);
5598 /* If the value was optimized out, revert to the old behavior. */
5599 if (! value_optimized_out (value
))
5601 handler
= value_as_address (value
);
5604 fprintf_unfiltered (gdb_stdlog
,
5605 "infrun: exception resume at %lx\n",
5606 (unsigned long) handler
);
5608 bp
= set_momentary_breakpoint_at_pc (get_frame_arch (frame
),
5609 handler
, bp_exception_resume
);
5611 /* set_momentary_breakpoint_at_pc invalidates FRAME. */
5614 bp
->thread
= tp
->num
;
5615 inferior_thread ()->control
.exception_resume_breakpoint
= bp
;
5620 /* A helper for check_exception_resume that sets an
5621 exception-breakpoint based on a SystemTap probe. */
5624 insert_exception_resume_from_probe (struct thread_info
*tp
,
5625 const struct probe
*probe
,
5626 struct frame_info
*frame
)
5628 struct value
*arg_value
;
5630 struct breakpoint
*bp
;
5632 arg_value
= probe_safe_evaluate_at_pc (frame
, 1);
5636 handler
= value_as_address (arg_value
);
5639 fprintf_unfiltered (gdb_stdlog
,
5640 "infrun: exception resume at %s\n",
5641 paddress (get_objfile_arch (probe
->objfile
),
5644 bp
= set_momentary_breakpoint_at_pc (get_frame_arch (frame
),
5645 handler
, bp_exception_resume
);
5646 bp
->thread
= tp
->num
;
5647 inferior_thread ()->control
.exception_resume_breakpoint
= bp
;
5650 /* This is called when an exception has been intercepted. Check to
5651 see whether the exception's destination is of interest, and if so,
5652 set an exception resume breakpoint there. */
5655 check_exception_resume (struct execution_control_state
*ecs
,
5656 struct frame_info
*frame
)
5658 volatile struct gdb_exception e
;
5659 const struct probe
*probe
;
5660 struct symbol
*func
;
5662 /* First see if this exception unwinding breakpoint was set via a
5663 SystemTap probe point. If so, the probe has two arguments: the
5664 CFA and the HANDLER. We ignore the CFA, extract the handler, and
5665 set a breakpoint there. */
5666 probe
= find_probe_by_pc (get_frame_pc (frame
));
5669 insert_exception_resume_from_probe (ecs
->event_thread
, probe
, frame
);
5673 func
= get_frame_function (frame
);
5677 TRY_CATCH (e
, RETURN_MASK_ERROR
)
5680 struct block_iterator iter
;
5684 /* The exception breakpoint is a thread-specific breakpoint on
5685 the unwinder's debug hook, declared as:
5687 void _Unwind_DebugHook (void *cfa, void *handler);
5689 The CFA argument indicates the frame to which control is
5690 about to be transferred. HANDLER is the destination PC.
5692 We ignore the CFA and set a temporary breakpoint at HANDLER.
5693 This is not extremely efficient but it avoids issues in gdb
5694 with computing the DWARF CFA, and it also works even in weird
5695 cases such as throwing an exception from inside a signal
5698 b
= SYMBOL_BLOCK_VALUE (func
);
5699 ALL_BLOCK_SYMBOLS (b
, iter
, sym
)
5701 if (!SYMBOL_IS_ARGUMENT (sym
))
5708 insert_exception_resume_breakpoint (ecs
->event_thread
,
5717 stop_stepping (struct execution_control_state
*ecs
)
5720 fprintf_unfiltered (gdb_stdlog
, "infrun: stop_stepping\n");
5722 /* Let callers know we don't want to wait for the inferior anymore. */
5723 ecs
->wait_some_more
= 0;
5726 /* Called when we should continue running the inferior, because the
5727 current event doesn't cause a user visible stop. This does the
5728 resuming part; waiting for the next event is done elsewhere. */
5731 keep_going (struct execution_control_state
*ecs
)
5733 /* Make sure normal_stop is called if we get a QUIT handled before
5735 struct cleanup
*old_cleanups
= make_cleanup (resume_cleanups
, 0);
5737 /* Save the pc before execution, to compare with pc after stop. */
5738 ecs
->event_thread
->prev_pc
5739 = regcache_read_pc (get_thread_regcache (ecs
->ptid
));
5741 if (ecs
->event_thread
->control
.trap_expected
5742 && ecs
->event_thread
->suspend
.stop_signal
!= GDB_SIGNAL_TRAP
)
5744 /* We haven't yet gotten our trap, and either: intercepted a
5745 non-signal event (e.g., a fork); or took a signal which we
5746 are supposed to pass through to the inferior. Simply
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 (if we got a signal, the user asked it be passed to
5758 We got our expected trap, but decided we should resume from
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
)))
5773 /* Since we can't do a displaced step, we have to remove
5774 the breakpoint while we step it. To keep things
5775 simple, we remove them all. */
5776 remove_breakpoints ();
5781 volatile struct gdb_exception e
;
5783 /* Stop stepping if inserting breakpoints fails. */
5784 TRY_CATCH (e
, RETURN_MASK_ERROR
)
5786 insert_breakpoints ();
5790 exception_print (gdb_stderr
, e
);
5791 stop_stepping (ecs
);
5796 ecs
->event_thread
->control
.trap_expected
5797 = ecs
->event_thread
->stepping_over_breakpoint
;
5799 /* Do not deliver GDB_SIGNAL_TRAP (except when the user
5800 explicitly specifies that such a signal should be delivered
5801 to the target program). Typically, that would occur when a
5802 user is debugging a target monitor on a simulator: the target
5803 monitor sets a breakpoint; the simulator encounters this
5804 breakpoint and halts the simulation handing control to GDB;
5805 GDB, noting that the stop address doesn't map to any known
5806 breakpoint, returns control back to the simulator; the
5807 simulator then delivers the hardware equivalent of a
5808 GDB_SIGNAL_TRAP to the program being debugged. */
5809 if (ecs
->event_thread
->suspend
.stop_signal
== GDB_SIGNAL_TRAP
5810 && !signal_program
[ecs
->event_thread
->suspend
.stop_signal
])
5811 ecs
->event_thread
->suspend
.stop_signal
= GDB_SIGNAL_0
;
5813 discard_cleanups (old_cleanups
);
5814 resume (currently_stepping (ecs
->event_thread
),
5815 ecs
->event_thread
->suspend
.stop_signal
);
5818 prepare_to_wait (ecs
);
5821 /* This function normally comes after a resume, before
5822 handle_inferior_event exits. It takes care of any last bits of
5823 housekeeping, and sets the all-important wait_some_more flag. */
5826 prepare_to_wait (struct execution_control_state
*ecs
)
5829 fprintf_unfiltered (gdb_stdlog
, "infrun: prepare_to_wait\n");
5831 /* This is the old end of the while loop. Let everybody know we
5832 want to wait for the inferior some more and get called again
5834 ecs
->wait_some_more
= 1;
5837 /* Several print_*_reason functions to print why the inferior has stopped.
5838 We always print something when the inferior exits, or receives a signal.
5839 The rest of the cases are dealt with later on in normal_stop and
5840 print_it_typical. Ideally there should be a call to one of these
5841 print_*_reason functions functions from handle_inferior_event each time
5842 stop_stepping is called. */
5844 /* Print why the inferior has stopped.
5845 We are done with a step/next/si/ni command, print why the inferior has
5846 stopped. For now print nothing. Print a message only if not in the middle
5847 of doing a "step n" operation for n > 1. */
5850 print_end_stepping_range_reason (void)
5852 if ((!inferior_thread ()->step_multi
5853 || !inferior_thread ()->control
.stop_step
)
5854 && ui_out_is_mi_like_p (current_uiout
))
5855 ui_out_field_string (current_uiout
, "reason",
5856 async_reason_lookup (EXEC_ASYNC_END_STEPPING_RANGE
));
5859 /* The inferior was terminated by a signal, print why it stopped. */
5862 print_signal_exited_reason (enum gdb_signal siggnal
)
5864 struct ui_out
*uiout
= current_uiout
;
5866 annotate_signalled ();
5867 if (ui_out_is_mi_like_p (uiout
))
5869 (uiout
, "reason", async_reason_lookup (EXEC_ASYNC_EXITED_SIGNALLED
));
5870 ui_out_text (uiout
, "\nProgram terminated with signal ");
5871 annotate_signal_name ();
5872 ui_out_field_string (uiout
, "signal-name",
5873 gdb_signal_to_name (siggnal
));
5874 annotate_signal_name_end ();
5875 ui_out_text (uiout
, ", ");
5876 annotate_signal_string ();
5877 ui_out_field_string (uiout
, "signal-meaning",
5878 gdb_signal_to_string (siggnal
));
5879 annotate_signal_string_end ();
5880 ui_out_text (uiout
, ".\n");
5881 ui_out_text (uiout
, "The program no longer exists.\n");
5884 /* The inferior program is finished, print why it stopped. */
5887 print_exited_reason (int exitstatus
)
5889 struct inferior
*inf
= current_inferior ();
5890 const char *pidstr
= target_pid_to_str (pid_to_ptid (inf
->pid
));
5891 struct ui_out
*uiout
= current_uiout
;
5893 annotate_exited (exitstatus
);
5896 if (ui_out_is_mi_like_p (uiout
))
5897 ui_out_field_string (uiout
, "reason",
5898 async_reason_lookup (EXEC_ASYNC_EXITED
));
5899 ui_out_text (uiout
, "[Inferior ");
5900 ui_out_text (uiout
, plongest (inf
->num
));
5901 ui_out_text (uiout
, " (");
5902 ui_out_text (uiout
, pidstr
);
5903 ui_out_text (uiout
, ") exited with code ");
5904 ui_out_field_fmt (uiout
, "exit-code", "0%o", (unsigned int) exitstatus
);
5905 ui_out_text (uiout
, "]\n");
5909 if (ui_out_is_mi_like_p (uiout
))
5911 (uiout
, "reason", async_reason_lookup (EXEC_ASYNC_EXITED_NORMALLY
));
5912 ui_out_text (uiout
, "[Inferior ");
5913 ui_out_text (uiout
, plongest (inf
->num
));
5914 ui_out_text (uiout
, " (");
5915 ui_out_text (uiout
, pidstr
);
5916 ui_out_text (uiout
, ") exited normally]\n");
5918 /* Support the --return-child-result option. */
5919 return_child_result_value
= exitstatus
;
5922 /* Signal received, print why the inferior has stopped. The signal table
5923 tells us to print about it. */
5926 print_signal_received_reason (enum gdb_signal siggnal
)
5928 struct ui_out
*uiout
= current_uiout
;
5932 if (siggnal
== GDB_SIGNAL_0
&& !ui_out_is_mi_like_p (uiout
))
5934 struct thread_info
*t
= inferior_thread ();
5936 ui_out_text (uiout
, "\n[");
5937 ui_out_field_string (uiout
, "thread-name",
5938 target_pid_to_str (t
->ptid
));
5939 ui_out_field_fmt (uiout
, "thread-id", "] #%d", t
->num
);
5940 ui_out_text (uiout
, " stopped");
5944 ui_out_text (uiout
, "\nProgram received signal ");
5945 annotate_signal_name ();
5946 if (ui_out_is_mi_like_p (uiout
))
5948 (uiout
, "reason", async_reason_lookup (EXEC_ASYNC_SIGNAL_RECEIVED
));
5949 ui_out_field_string (uiout
, "signal-name",
5950 gdb_signal_to_name (siggnal
));
5951 annotate_signal_name_end ();
5952 ui_out_text (uiout
, ", ");
5953 annotate_signal_string ();
5954 ui_out_field_string (uiout
, "signal-meaning",
5955 gdb_signal_to_string (siggnal
));
5956 annotate_signal_string_end ();
5958 ui_out_text (uiout
, ".\n");
5961 /* Reverse execution: target ran out of history info, print why the inferior
5965 print_no_history_reason (void)
5967 ui_out_text (current_uiout
, "\nNo more reverse-execution history.\n");
5970 /* Here to return control to GDB when the inferior stops for real.
5971 Print appropriate messages, remove breakpoints, give terminal our modes.
5973 STOP_PRINT_FRAME nonzero means print the executing frame
5974 (pc, function, args, file, line number and line text).
5975 BREAKPOINTS_FAILED nonzero means stop was due to error
5976 attempting to insert breakpoints. */
5981 struct target_waitstatus last
;
5983 struct cleanup
*old_chain
= make_cleanup (null_cleanup
, NULL
);
5985 get_last_target_status (&last_ptid
, &last
);
5987 /* If an exception is thrown from this point on, make sure to
5988 propagate GDB's knowledge of the executing state to the
5989 frontend/user running state. A QUIT is an easy exception to see
5990 here, so do this before any filtered output. */
5992 make_cleanup (finish_thread_state_cleanup
, &minus_one_ptid
);
5993 else if (last
.kind
!= TARGET_WAITKIND_SIGNALLED
5994 && last
.kind
!= TARGET_WAITKIND_EXITED
5995 && last
.kind
!= TARGET_WAITKIND_NO_RESUMED
)
5996 make_cleanup (finish_thread_state_cleanup
, &inferior_ptid
);
5998 /* In non-stop mode, we don't want GDB to switch threads behind the
5999 user's back, to avoid races where the user is typing a command to
6000 apply to thread x, but GDB switches to thread y before the user
6001 finishes entering the command. */
6003 /* As with the notification of thread events, we want to delay
6004 notifying the user that we've switched thread context until
6005 the inferior actually stops.
6007 There's no point in saying anything if the inferior has exited.
6008 Note that SIGNALLED here means "exited with a signal", not
6009 "received a signal". */
6011 && !ptid_equal (previous_inferior_ptid
, inferior_ptid
)
6012 && target_has_execution
6013 && last
.kind
!= TARGET_WAITKIND_SIGNALLED
6014 && last
.kind
!= TARGET_WAITKIND_EXITED
6015 && last
.kind
!= TARGET_WAITKIND_NO_RESUMED
)
6017 target_terminal_ours_for_output ();
6018 printf_filtered (_("[Switching to %s]\n"),
6019 target_pid_to_str (inferior_ptid
));
6020 annotate_thread_changed ();
6021 previous_inferior_ptid
= inferior_ptid
;
6024 if (last
.kind
== TARGET_WAITKIND_NO_RESUMED
)
6026 gdb_assert (sync_execution
|| !target_can_async_p ());
6028 target_terminal_ours_for_output ();
6029 printf_filtered (_("No unwaited-for children left.\n"));
6032 if (!breakpoints_always_inserted_mode () && target_has_execution
)
6034 if (remove_breakpoints ())
6036 target_terminal_ours_for_output ();
6037 printf_filtered (_("Cannot remove breakpoints because "
6038 "program is no longer writable.\nFurther "
6039 "execution is probably impossible.\n"));
6043 /* If an auto-display called a function and that got a signal,
6044 delete that auto-display to avoid an infinite recursion. */
6046 if (stopped_by_random_signal
)
6047 disable_current_display ();
6049 /* Don't print a message if in the middle of doing a "step n"
6050 operation for n > 1 */
6051 if (target_has_execution
6052 && last
.kind
!= TARGET_WAITKIND_SIGNALLED
6053 && last
.kind
!= TARGET_WAITKIND_EXITED
6054 && inferior_thread ()->step_multi
6055 && inferior_thread ()->control
.stop_step
)
6058 target_terminal_ours ();
6059 async_enable_stdin ();
6061 /* Set the current source location. This will also happen if we
6062 display the frame below, but the current SAL will be incorrect
6063 during a user hook-stop function. */
6064 if (has_stack_frames () && !stop_stack_dummy
)
6065 set_current_sal_from_frame (get_current_frame (), 1);
6067 /* Let the user/frontend see the threads as stopped. */
6068 do_cleanups (old_chain
);
6070 /* Look up the hook_stop and run it (CLI internally handles problem
6071 of stop_command's pre-hook not existing). */
6073 catch_errors (hook_stop_stub
, stop_command
,
6074 "Error while running hook_stop:\n", RETURN_MASK_ALL
);
6076 if (!has_stack_frames ())
6079 if (last
.kind
== TARGET_WAITKIND_SIGNALLED
6080 || last
.kind
== TARGET_WAITKIND_EXITED
)
6083 /* Select innermost stack frame - i.e., current frame is frame 0,
6084 and current location is based on that.
6085 Don't do this on return from a stack dummy routine,
6086 or if the program has exited. */
6088 if (!stop_stack_dummy
)
6090 select_frame (get_current_frame ());
6092 /* Print current location without a level number, if
6093 we have changed functions or hit a breakpoint.
6094 Print source line if we have one.
6095 bpstat_print() contains the logic deciding in detail
6096 what to print, based on the event(s) that just occurred. */
6098 /* If --batch-silent is enabled then there's no need to print the current
6099 source location, and to try risks causing an error message about
6100 missing source files. */
6101 if (stop_print_frame
&& !batch_silent
)
6105 int do_frame_printing
= 1;
6106 struct thread_info
*tp
= inferior_thread ();
6108 bpstat_ret
= bpstat_print (tp
->control
.stop_bpstat
, last
.kind
);
6112 /* FIXME: cagney/2002-12-01: Given that a frame ID does
6113 (or should) carry around the function and does (or
6114 should) use that when doing a frame comparison. */
6115 if (tp
->control
.stop_step
6116 && frame_id_eq (tp
->control
.step_frame_id
,
6117 get_frame_id (get_current_frame ()))
6118 && step_start_function
== find_pc_function (stop_pc
))
6119 source_flag
= SRC_LINE
; /* Finished step, just
6120 print source line. */
6122 source_flag
= SRC_AND_LOC
; /* Print location and
6125 case PRINT_SRC_AND_LOC
:
6126 source_flag
= SRC_AND_LOC
; /* Print location and
6129 case PRINT_SRC_ONLY
:
6130 source_flag
= SRC_LINE
;
6133 source_flag
= SRC_LINE
; /* something bogus */
6134 do_frame_printing
= 0;
6137 internal_error (__FILE__
, __LINE__
, _("Unknown value."));
6140 /* The behavior of this routine with respect to the source
6142 SRC_LINE: Print only source line
6143 LOCATION: Print only location
6144 SRC_AND_LOC: Print location and source line. */
6145 if (do_frame_printing
)
6146 print_stack_frame (get_selected_frame (NULL
), 0, source_flag
, 1);
6148 /* Display the auto-display expressions. */
6153 /* Save the function value return registers, if we care.
6154 We might be about to restore their previous contents. */
6155 if (inferior_thread ()->control
.proceed_to_finish
6156 && execution_direction
!= EXEC_REVERSE
)
6158 /* This should not be necessary. */
6160 regcache_xfree (stop_registers
);
6162 /* NB: The copy goes through to the target picking up the value of
6163 all the registers. */
6164 stop_registers
= regcache_dup (get_current_regcache ());
6167 if (stop_stack_dummy
== STOP_STACK_DUMMY
)
6169 /* Pop the empty frame that contains the stack dummy.
6170 This also restores inferior state prior to the call
6171 (struct infcall_suspend_state). */
6172 struct frame_info
*frame
= get_current_frame ();
6174 gdb_assert (get_frame_type (frame
) == DUMMY_FRAME
);
6176 /* frame_pop() calls reinit_frame_cache as the last thing it
6177 does which means there's currently no selected frame. We
6178 don't need to re-establish a selected frame if the dummy call
6179 returns normally, that will be done by
6180 restore_infcall_control_state. However, we do have to handle
6181 the case where the dummy call is returning after being
6182 stopped (e.g. the dummy call previously hit a breakpoint).
6183 We can't know which case we have so just always re-establish
6184 a selected frame here. */
6185 select_frame (get_current_frame ());
6189 annotate_stopped ();
6191 /* Suppress the stop observer if we're in the middle of:
6193 - a step n (n > 1), as there still more steps to be done.
6195 - a "finish" command, as the observer will be called in
6196 finish_command_continuation, so it can include the inferior
6197 function's return value.
6199 - calling an inferior function, as we pretend we inferior didn't
6200 run at all. The return value of the call is handled by the
6201 expression evaluator, through call_function_by_hand. */
6203 if (!target_has_execution
6204 || last
.kind
== TARGET_WAITKIND_SIGNALLED
6205 || last
.kind
== TARGET_WAITKIND_EXITED
6206 || last
.kind
== TARGET_WAITKIND_NO_RESUMED
6207 || (!(inferior_thread ()->step_multi
6208 && inferior_thread ()->control
.stop_step
)
6209 && !(inferior_thread ()->control
.stop_bpstat
6210 && inferior_thread ()->control
.proceed_to_finish
)
6211 && !inferior_thread ()->control
.in_infcall
))
6213 if (!ptid_equal (inferior_ptid
, null_ptid
))
6214 observer_notify_normal_stop (inferior_thread ()->control
.stop_bpstat
,
6217 observer_notify_normal_stop (NULL
, stop_print_frame
);
6220 if (target_has_execution
)
6222 if (last
.kind
!= TARGET_WAITKIND_SIGNALLED
6223 && last
.kind
!= TARGET_WAITKIND_EXITED
)
6224 /* Delete the breakpoint we stopped at, if it wants to be deleted.
6225 Delete any breakpoint that is to be deleted at the next stop. */
6226 breakpoint_auto_delete (inferior_thread ()->control
.stop_bpstat
);
6229 /* Try to get rid of automatically added inferiors that are no
6230 longer needed. Keeping those around slows down things linearly.
6231 Note that this never removes the current inferior. */
6236 hook_stop_stub (void *cmd
)
6238 execute_cmd_pre_hook ((struct cmd_list_element
*) cmd
);
6243 signal_stop_state (int signo
)
6245 return signal_stop
[signo
];
6249 signal_print_state (int signo
)
6251 return signal_print
[signo
];
6255 signal_pass_state (int signo
)
6257 return signal_program
[signo
];
6261 signal_cache_update (int signo
)
6265 for (signo
= 0; signo
< (int) GDB_SIGNAL_LAST
; signo
++)
6266 signal_cache_update (signo
);
6271 signal_pass
[signo
] = (signal_stop
[signo
] == 0
6272 && signal_print
[signo
] == 0
6273 && signal_program
[signo
] == 1
6274 && signal_catch
[signo
] == 0);
6278 signal_stop_update (int signo
, int state
)
6280 int ret
= signal_stop
[signo
];
6282 signal_stop
[signo
] = state
;
6283 signal_cache_update (signo
);
6288 signal_print_update (int signo
, int state
)
6290 int ret
= signal_print
[signo
];
6292 signal_print
[signo
] = state
;
6293 signal_cache_update (signo
);
6298 signal_pass_update (int signo
, int state
)
6300 int ret
= signal_program
[signo
];
6302 signal_program
[signo
] = state
;
6303 signal_cache_update (signo
);
6307 /* Update the global 'signal_catch' from INFO and notify the
6311 signal_catch_update (const unsigned int *info
)
6315 for (i
= 0; i
< GDB_SIGNAL_LAST
; ++i
)
6316 signal_catch
[i
] = info
[i
] > 0;
6317 signal_cache_update (-1);
6318 target_pass_signals ((int) GDB_SIGNAL_LAST
, signal_pass
);
6322 sig_print_header (void)
6324 printf_filtered (_("Signal Stop\tPrint\tPass "
6325 "to program\tDescription\n"));
6329 sig_print_info (enum gdb_signal oursig
)
6331 const char *name
= gdb_signal_to_name (oursig
);
6332 int name_padding
= 13 - strlen (name
);
6334 if (name_padding
<= 0)
6337 printf_filtered ("%s", name
);
6338 printf_filtered ("%*.*s ", name_padding
, name_padding
, " ");
6339 printf_filtered ("%s\t", signal_stop
[oursig
] ? "Yes" : "No");
6340 printf_filtered ("%s\t", signal_print
[oursig
] ? "Yes" : "No");
6341 printf_filtered ("%s\t\t", signal_program
[oursig
] ? "Yes" : "No");
6342 printf_filtered ("%s\n", gdb_signal_to_string (oursig
));
6345 /* Specify how various signals in the inferior should be handled. */
6348 handle_command (char *args
, int from_tty
)
6351 int digits
, wordlen
;
6352 int sigfirst
, signum
, siglast
;
6353 enum gdb_signal oursig
;
6356 unsigned char *sigs
;
6357 struct cleanup
*old_chain
;
6361 error_no_arg (_("signal to handle"));
6364 /* Allocate and zero an array of flags for which signals to handle. */
6366 nsigs
= (int) GDB_SIGNAL_LAST
;
6367 sigs
= (unsigned char *) alloca (nsigs
);
6368 memset (sigs
, 0, nsigs
);
6370 /* Break the command line up into args. */
6372 argv
= gdb_buildargv (args
);
6373 old_chain
= make_cleanup_freeargv (argv
);
6375 /* Walk through the args, looking for signal oursigs, signal names, and
6376 actions. Signal numbers and signal names may be interspersed with
6377 actions, with the actions being performed for all signals cumulatively
6378 specified. Signal ranges can be specified as <LOW>-<HIGH>. */
6380 while (*argv
!= NULL
)
6382 wordlen
= strlen (*argv
);
6383 for (digits
= 0; isdigit ((*argv
)[digits
]); digits
++)
6387 sigfirst
= siglast
= -1;
6389 if (wordlen
>= 1 && !strncmp (*argv
, "all", wordlen
))
6391 /* Apply action to all signals except those used by the
6392 debugger. Silently skip those. */
6395 siglast
= nsigs
- 1;
6397 else if (wordlen
>= 1 && !strncmp (*argv
, "stop", wordlen
))
6399 SET_SIGS (nsigs
, sigs
, signal_stop
);
6400 SET_SIGS (nsigs
, sigs
, signal_print
);
6402 else if (wordlen
>= 1 && !strncmp (*argv
, "ignore", wordlen
))
6404 UNSET_SIGS (nsigs
, sigs
, signal_program
);
6406 else if (wordlen
>= 2 && !strncmp (*argv
, "print", wordlen
))
6408 SET_SIGS (nsigs
, sigs
, signal_print
);
6410 else if (wordlen
>= 2 && !strncmp (*argv
, "pass", wordlen
))
6412 SET_SIGS (nsigs
, sigs
, signal_program
);
6414 else if (wordlen
>= 3 && !strncmp (*argv
, "nostop", wordlen
))
6416 UNSET_SIGS (nsigs
, sigs
, signal_stop
);
6418 else if (wordlen
>= 3 && !strncmp (*argv
, "noignore", wordlen
))
6420 SET_SIGS (nsigs
, sigs
, signal_program
);
6422 else if (wordlen
>= 4 && !strncmp (*argv
, "noprint", wordlen
))
6424 UNSET_SIGS (nsigs
, sigs
, signal_print
);
6425 UNSET_SIGS (nsigs
, sigs
, signal_stop
);
6427 else if (wordlen
>= 4 && !strncmp (*argv
, "nopass", wordlen
))
6429 UNSET_SIGS (nsigs
, sigs
, signal_program
);
6431 else if (digits
> 0)
6433 /* It is numeric. The numeric signal refers to our own
6434 internal signal numbering from target.h, not to host/target
6435 signal number. This is a feature; users really should be
6436 using symbolic names anyway, and the common ones like
6437 SIGHUP, SIGINT, SIGALRM, etc. will work right anyway. */
6439 sigfirst
= siglast
= (int)
6440 gdb_signal_from_command (atoi (*argv
));
6441 if ((*argv
)[digits
] == '-')
6444 gdb_signal_from_command (atoi ((*argv
) + digits
+ 1));
6446 if (sigfirst
> siglast
)
6448 /* Bet he didn't figure we'd think of this case... */
6456 oursig
= gdb_signal_from_name (*argv
);
6457 if (oursig
!= GDB_SIGNAL_UNKNOWN
)
6459 sigfirst
= siglast
= (int) oursig
;
6463 /* Not a number and not a recognized flag word => complain. */
6464 error (_("Unrecognized or ambiguous flag word: \"%s\"."), *argv
);
6468 /* If any signal numbers or symbol names were found, set flags for
6469 which signals to apply actions to. */
6471 for (signum
= sigfirst
; signum
>= 0 && signum
<= siglast
; signum
++)
6473 switch ((enum gdb_signal
) signum
)
6475 case GDB_SIGNAL_TRAP
:
6476 case GDB_SIGNAL_INT
:
6477 if (!allsigs
&& !sigs
[signum
])
6479 if (query (_("%s is used by the debugger.\n\
6480 Are you sure you want to change it? "),
6481 gdb_signal_to_name ((enum gdb_signal
) signum
)))
6487 printf_unfiltered (_("Not confirmed, unchanged.\n"));
6488 gdb_flush (gdb_stdout
);
6493 case GDB_SIGNAL_DEFAULT
:
6494 case GDB_SIGNAL_UNKNOWN
:
6495 /* Make sure that "all" doesn't print these. */
6506 for (signum
= 0; signum
< nsigs
; signum
++)
6509 signal_cache_update (-1);
6510 target_pass_signals ((int) GDB_SIGNAL_LAST
, signal_pass
);
6511 target_program_signals ((int) GDB_SIGNAL_LAST
, signal_program
);
6515 /* Show the results. */
6516 sig_print_header ();
6517 for (; signum
< nsigs
; signum
++)
6519 sig_print_info (signum
);
6525 do_cleanups (old_chain
);
6528 /* Complete the "handle" command. */
6530 static VEC (char_ptr
) *
6531 handle_completer (struct cmd_list_element
*ignore
,
6532 const char *text
, const char *word
)
6534 VEC (char_ptr
) *vec_signals
, *vec_keywords
, *return_val
;
6535 static const char * const keywords
[] =
6549 vec_signals
= signal_completer (ignore
, text
, word
);
6550 vec_keywords
= complete_on_enum (keywords
, word
, word
);
6552 return_val
= VEC_merge (char_ptr
, vec_signals
, vec_keywords
);
6553 VEC_free (char_ptr
, vec_signals
);
6554 VEC_free (char_ptr
, vec_keywords
);
6559 xdb_handle_command (char *args
, int from_tty
)
6562 struct cleanup
*old_chain
;
6565 error_no_arg (_("xdb command"));
6567 /* Break the command line up into args. */
6569 argv
= gdb_buildargv (args
);
6570 old_chain
= make_cleanup_freeargv (argv
);
6571 if (argv
[1] != (char *) NULL
)
6576 bufLen
= strlen (argv
[0]) + 20;
6577 argBuf
= (char *) xmalloc (bufLen
);
6581 enum gdb_signal oursig
;
6583 oursig
= gdb_signal_from_name (argv
[0]);
6584 memset (argBuf
, 0, bufLen
);
6585 if (strcmp (argv
[1], "Q") == 0)
6586 sprintf (argBuf
, "%s %s", argv
[0], "noprint");
6589 if (strcmp (argv
[1], "s") == 0)
6591 if (!signal_stop
[oursig
])
6592 sprintf (argBuf
, "%s %s", argv
[0], "stop");
6594 sprintf (argBuf
, "%s %s", argv
[0], "nostop");
6596 else if (strcmp (argv
[1], "i") == 0)
6598 if (!signal_program
[oursig
])
6599 sprintf (argBuf
, "%s %s", argv
[0], "pass");
6601 sprintf (argBuf
, "%s %s", argv
[0], "nopass");
6603 else if (strcmp (argv
[1], "r") == 0)
6605 if (!signal_print
[oursig
])
6606 sprintf (argBuf
, "%s %s", argv
[0], "print");
6608 sprintf (argBuf
, "%s %s", argv
[0], "noprint");
6614 handle_command (argBuf
, from_tty
);
6616 printf_filtered (_("Invalid signal handling flag.\n"));
6621 do_cleanups (old_chain
);
6625 gdb_signal_from_command (int num
)
6627 if (num
>= 1 && num
<= 15)
6628 return (enum gdb_signal
) num
;
6629 error (_("Only signals 1-15 are valid as numeric signals.\n\
6630 Use \"info signals\" for a list of symbolic signals."));
6633 /* Print current contents of the tables set by the handle command.
6634 It is possible we should just be printing signals actually used
6635 by the current target (but for things to work right when switching
6636 targets, all signals should be in the signal tables). */
6639 signals_info (char *signum_exp
, int from_tty
)
6641 enum gdb_signal oursig
;
6643 sig_print_header ();
6647 /* First see if this is a symbol name. */
6648 oursig
= gdb_signal_from_name (signum_exp
);
6649 if (oursig
== GDB_SIGNAL_UNKNOWN
)
6651 /* No, try numeric. */
6653 gdb_signal_from_command (parse_and_eval_long (signum_exp
));
6655 sig_print_info (oursig
);
6659 printf_filtered ("\n");
6660 /* These ugly casts brought to you by the native VAX compiler. */
6661 for (oursig
= GDB_SIGNAL_FIRST
;
6662 (int) oursig
< (int) GDB_SIGNAL_LAST
;
6663 oursig
= (enum gdb_signal
) ((int) oursig
+ 1))
6667 if (oursig
!= GDB_SIGNAL_UNKNOWN
6668 && oursig
!= GDB_SIGNAL_DEFAULT
&& oursig
!= GDB_SIGNAL_0
)
6669 sig_print_info (oursig
);
6672 printf_filtered (_("\nUse the \"handle\" command "
6673 "to change these tables.\n"));
6676 /* Check if it makes sense to read $_siginfo from the current thread
6677 at this point. If not, throw an error. */
6680 validate_siginfo_access (void)
6682 /* No current inferior, no siginfo. */
6683 if (ptid_equal (inferior_ptid
, null_ptid
))
6684 error (_("No thread selected."));
6686 /* Don't try to read from a dead thread. */
6687 if (is_exited (inferior_ptid
))
6688 error (_("The current thread has terminated"));
6690 /* ... or from a spinning thread. */
6691 if (is_running (inferior_ptid
))
6692 error (_("Selected thread is running."));
6695 /* The $_siginfo convenience variable is a bit special. We don't know
6696 for sure the type of the value until we actually have a chance to
6697 fetch the data. The type can change depending on gdbarch, so it is
6698 also dependent on which thread you have selected.
6700 1. making $_siginfo be an internalvar that creates a new value on
6703 2. making the value of $_siginfo be an lval_computed value. */
6705 /* This function implements the lval_computed support for reading a
6709 siginfo_value_read (struct value
*v
)
6711 LONGEST transferred
;
6713 validate_siginfo_access ();
6716 target_read (¤t_target
, TARGET_OBJECT_SIGNAL_INFO
,
6718 value_contents_all_raw (v
),
6720 TYPE_LENGTH (value_type (v
)));
6722 if (transferred
!= TYPE_LENGTH (value_type (v
)))
6723 error (_("Unable to read siginfo"));
6726 /* This function implements the lval_computed support for writing a
6730 siginfo_value_write (struct value
*v
, struct value
*fromval
)
6732 LONGEST transferred
;
6734 validate_siginfo_access ();
6736 transferred
= target_write (¤t_target
,
6737 TARGET_OBJECT_SIGNAL_INFO
,
6739 value_contents_all_raw (fromval
),
6741 TYPE_LENGTH (value_type (fromval
)));
6743 if (transferred
!= TYPE_LENGTH (value_type (fromval
)))
6744 error (_("Unable to write siginfo"));
6747 static const struct lval_funcs siginfo_value_funcs
=
6753 /* Return a new value with the correct type for the siginfo object of
6754 the current thread using architecture GDBARCH. Return a void value
6755 if there's no object available. */
6757 static struct value
*
6758 siginfo_make_value (struct gdbarch
*gdbarch
, struct internalvar
*var
,
6761 if (target_has_stack
6762 && !ptid_equal (inferior_ptid
, null_ptid
)
6763 && gdbarch_get_siginfo_type_p (gdbarch
))
6765 struct type
*type
= gdbarch_get_siginfo_type (gdbarch
);
6767 return allocate_computed_value (type
, &siginfo_value_funcs
, NULL
);
6770 return allocate_value (builtin_type (gdbarch
)->builtin_void
);
6774 /* infcall_suspend_state contains state about the program itself like its
6775 registers and any signal it received when it last stopped.
6776 This state must be restored regardless of how the inferior function call
6777 ends (either successfully, or after it hits a breakpoint or signal)
6778 if the program is to properly continue where it left off. */
6780 struct infcall_suspend_state
6782 struct thread_suspend_state thread_suspend
;
6783 #if 0 /* Currently unused and empty structures are not valid C. */
6784 struct inferior_suspend_state inferior_suspend
;
6789 struct regcache
*registers
;
6791 /* Format of SIGINFO_DATA or NULL if it is not present. */
6792 struct gdbarch
*siginfo_gdbarch
;
6794 /* The inferior format depends on SIGINFO_GDBARCH and it has a length of
6795 TYPE_LENGTH (gdbarch_get_siginfo_type ()). For different gdbarch the
6796 content would be invalid. */
6797 gdb_byte
*siginfo_data
;
6800 struct infcall_suspend_state
*
6801 save_infcall_suspend_state (void)
6803 struct infcall_suspend_state
*inf_state
;
6804 struct thread_info
*tp
= inferior_thread ();
6806 struct inferior
*inf
= current_inferior ();
6808 struct regcache
*regcache
= get_current_regcache ();
6809 struct gdbarch
*gdbarch
= get_regcache_arch (regcache
);
6810 gdb_byte
*siginfo_data
= NULL
;
6812 if (gdbarch_get_siginfo_type_p (gdbarch
))
6814 struct type
*type
= gdbarch_get_siginfo_type (gdbarch
);
6815 size_t len
= TYPE_LENGTH (type
);
6816 struct cleanup
*back_to
;
6818 siginfo_data
= xmalloc (len
);
6819 back_to
= make_cleanup (xfree
, siginfo_data
);
6821 if (target_read (¤t_target
, TARGET_OBJECT_SIGNAL_INFO
, NULL
,
6822 siginfo_data
, 0, len
) == len
)
6823 discard_cleanups (back_to
);
6826 /* Errors ignored. */
6827 do_cleanups (back_to
);
6828 siginfo_data
= NULL
;
6832 inf_state
= XZALLOC (struct infcall_suspend_state
);
6836 inf_state
->siginfo_gdbarch
= gdbarch
;
6837 inf_state
->siginfo_data
= siginfo_data
;
6840 inf_state
->thread_suspend
= tp
->suspend
;
6841 #if 0 /* Currently unused and empty structures are not valid C. */
6842 inf_state
->inferior_suspend
= inf
->suspend
;
6845 /* run_inferior_call will not use the signal due to its `proceed' call with
6846 GDB_SIGNAL_0 anyway. */
6847 tp
->suspend
.stop_signal
= GDB_SIGNAL_0
;
6849 inf_state
->stop_pc
= stop_pc
;
6851 inf_state
->registers
= regcache_dup (regcache
);
6856 /* Restore inferior session state to INF_STATE. */
6859 restore_infcall_suspend_state (struct infcall_suspend_state
*inf_state
)
6861 struct thread_info
*tp
= inferior_thread ();
6863 struct inferior
*inf
= current_inferior ();
6865 struct regcache
*regcache
= get_current_regcache ();
6866 struct gdbarch
*gdbarch
= get_regcache_arch (regcache
);
6868 tp
->suspend
= inf_state
->thread_suspend
;
6869 #if 0 /* Currently unused and empty structures are not valid C. */
6870 inf
->suspend
= inf_state
->inferior_suspend
;
6873 stop_pc
= inf_state
->stop_pc
;
6875 if (inf_state
->siginfo_gdbarch
== gdbarch
)
6877 struct type
*type
= gdbarch_get_siginfo_type (gdbarch
);
6879 /* Errors ignored. */
6880 target_write (¤t_target
, TARGET_OBJECT_SIGNAL_INFO
, NULL
,
6881 inf_state
->siginfo_data
, 0, TYPE_LENGTH (type
));
6884 /* The inferior can be gone if the user types "print exit(0)"
6885 (and perhaps other times). */
6886 if (target_has_execution
)
6887 /* NB: The register write goes through to the target. */
6888 regcache_cpy (regcache
, inf_state
->registers
);
6890 discard_infcall_suspend_state (inf_state
);
6894 do_restore_infcall_suspend_state_cleanup (void *state
)
6896 restore_infcall_suspend_state (state
);
6900 make_cleanup_restore_infcall_suspend_state
6901 (struct infcall_suspend_state
*inf_state
)
6903 return make_cleanup (do_restore_infcall_suspend_state_cleanup
, inf_state
);
6907 discard_infcall_suspend_state (struct infcall_suspend_state
*inf_state
)
6909 regcache_xfree (inf_state
->registers
);
6910 xfree (inf_state
->siginfo_data
);
6915 get_infcall_suspend_state_regcache (struct infcall_suspend_state
*inf_state
)
6917 return inf_state
->registers
;
6920 /* infcall_control_state contains state regarding gdb's control of the
6921 inferior itself like stepping control. It also contains session state like
6922 the user's currently selected frame. */
6924 struct infcall_control_state
6926 struct thread_control_state thread_control
;
6927 struct inferior_control_state inferior_control
;
6930 enum stop_stack_kind stop_stack_dummy
;
6931 int stopped_by_random_signal
;
6932 int stop_after_trap
;
6934 /* ID if the selected frame when the inferior function call was made. */
6935 struct frame_id selected_frame_id
;
6938 /* Save all of the information associated with the inferior<==>gdb
6941 struct infcall_control_state
*
6942 save_infcall_control_state (void)
6944 struct infcall_control_state
*inf_status
= xmalloc (sizeof (*inf_status
));
6945 struct thread_info
*tp
= inferior_thread ();
6946 struct inferior
*inf
= current_inferior ();
6948 inf_status
->thread_control
= tp
->control
;
6949 inf_status
->inferior_control
= inf
->control
;
6951 tp
->control
.step_resume_breakpoint
= NULL
;
6952 tp
->control
.exception_resume_breakpoint
= NULL
;
6954 /* Save original bpstat chain to INF_STATUS; replace it in TP with copy of
6955 chain. If caller's caller is walking the chain, they'll be happier if we
6956 hand them back the original chain when restore_infcall_control_state is
6958 tp
->control
.stop_bpstat
= bpstat_copy (tp
->control
.stop_bpstat
);
6961 inf_status
->stop_stack_dummy
= stop_stack_dummy
;
6962 inf_status
->stopped_by_random_signal
= stopped_by_random_signal
;
6963 inf_status
->stop_after_trap
= stop_after_trap
;
6965 inf_status
->selected_frame_id
= get_frame_id (get_selected_frame (NULL
));
6971 restore_selected_frame (void *args
)
6973 struct frame_id
*fid
= (struct frame_id
*) args
;
6974 struct frame_info
*frame
;
6976 frame
= frame_find_by_id (*fid
);
6978 /* If inf_status->selected_frame_id is NULL, there was no previously
6982 warning (_("Unable to restore previously selected frame."));
6986 select_frame (frame
);
6991 /* Restore inferior session state to INF_STATUS. */
6994 restore_infcall_control_state (struct infcall_control_state
*inf_status
)
6996 struct thread_info
*tp
= inferior_thread ();
6997 struct inferior
*inf
= current_inferior ();
6999 if (tp
->control
.step_resume_breakpoint
)
7000 tp
->control
.step_resume_breakpoint
->disposition
= disp_del_at_next_stop
;
7002 if (tp
->control
.exception_resume_breakpoint
)
7003 tp
->control
.exception_resume_breakpoint
->disposition
7004 = disp_del_at_next_stop
;
7006 /* Handle the bpstat_copy of the chain. */
7007 bpstat_clear (&tp
->control
.stop_bpstat
);
7009 tp
->control
= inf_status
->thread_control
;
7010 inf
->control
= inf_status
->inferior_control
;
7013 stop_stack_dummy
= inf_status
->stop_stack_dummy
;
7014 stopped_by_random_signal
= inf_status
->stopped_by_random_signal
;
7015 stop_after_trap
= inf_status
->stop_after_trap
;
7017 if (target_has_stack
)
7019 /* The point of catch_errors is that if the stack is clobbered,
7020 walking the stack might encounter a garbage pointer and
7021 error() trying to dereference it. */
7023 (restore_selected_frame
, &inf_status
->selected_frame_id
,
7024 "Unable to restore previously selected frame:\n",
7025 RETURN_MASK_ERROR
) == 0)
7026 /* Error in restoring the selected frame. Select the innermost
7028 select_frame (get_current_frame ());
7035 do_restore_infcall_control_state_cleanup (void *sts
)
7037 restore_infcall_control_state (sts
);
7041 make_cleanup_restore_infcall_control_state
7042 (struct infcall_control_state
*inf_status
)
7044 return make_cleanup (do_restore_infcall_control_state_cleanup
, inf_status
);
7048 discard_infcall_control_state (struct infcall_control_state
*inf_status
)
7050 if (inf_status
->thread_control
.step_resume_breakpoint
)
7051 inf_status
->thread_control
.step_resume_breakpoint
->disposition
7052 = disp_del_at_next_stop
;
7054 if (inf_status
->thread_control
.exception_resume_breakpoint
)
7055 inf_status
->thread_control
.exception_resume_breakpoint
->disposition
7056 = disp_del_at_next_stop
;
7058 /* See save_infcall_control_state for info on stop_bpstat. */
7059 bpstat_clear (&inf_status
->thread_control
.stop_bpstat
);
7065 ptid_match (ptid_t ptid
, ptid_t filter
)
7067 if (ptid_equal (filter
, minus_one_ptid
))
7069 if (ptid_is_pid (filter
)
7070 && ptid_get_pid (ptid
) == ptid_get_pid (filter
))
7072 else if (ptid_equal (ptid
, filter
))
7078 /* restore_inferior_ptid() will be used by the cleanup machinery
7079 to restore the inferior_ptid value saved in a call to
7080 save_inferior_ptid(). */
7083 restore_inferior_ptid (void *arg
)
7085 ptid_t
*saved_ptid_ptr
= arg
;
7087 inferior_ptid
= *saved_ptid_ptr
;
7091 /* Save the value of inferior_ptid so that it may be restored by a
7092 later call to do_cleanups(). Returns the struct cleanup pointer
7093 needed for later doing the cleanup. */
7096 save_inferior_ptid (void)
7098 ptid_t
*saved_ptid_ptr
;
7100 saved_ptid_ptr
= xmalloc (sizeof (ptid_t
));
7101 *saved_ptid_ptr
= inferior_ptid
;
7102 return make_cleanup (restore_inferior_ptid
, saved_ptid_ptr
);
7105 /* See inferior.h. */
7108 clear_exit_convenience_vars (void)
7110 clear_internalvar (lookup_internalvar ("_exitsignal"));
7111 clear_internalvar (lookup_internalvar ("_exitcode"));
7115 /* User interface for reverse debugging:
7116 Set exec-direction / show exec-direction commands
7117 (returns error unless target implements to_set_exec_direction method). */
7119 int execution_direction
= EXEC_FORWARD
;
7120 static const char exec_forward
[] = "forward";
7121 static const char exec_reverse
[] = "reverse";
7122 static const char *exec_direction
= exec_forward
;
7123 static const char *const exec_direction_names
[] = {
7130 set_exec_direction_func (char *args
, int from_tty
,
7131 struct cmd_list_element
*cmd
)
7133 if (target_can_execute_reverse
)
7135 if (!strcmp (exec_direction
, exec_forward
))
7136 execution_direction
= EXEC_FORWARD
;
7137 else if (!strcmp (exec_direction
, exec_reverse
))
7138 execution_direction
= EXEC_REVERSE
;
7142 exec_direction
= exec_forward
;
7143 error (_("Target does not support this operation."));
7148 show_exec_direction_func (struct ui_file
*out
, int from_tty
,
7149 struct cmd_list_element
*cmd
, const char *value
)
7151 switch (execution_direction
) {
7153 fprintf_filtered (out
, _("Forward.\n"));
7156 fprintf_filtered (out
, _("Reverse.\n"));
7159 internal_error (__FILE__
, __LINE__
,
7160 _("bogus execution_direction value: %d"),
7161 (int) execution_direction
);
7166 show_schedule_multiple (struct ui_file
*file
, int from_tty
,
7167 struct cmd_list_element
*c
, const char *value
)
7169 fprintf_filtered (file
, _("Resuming the execution of threads "
7170 "of all processes is %s.\n"), value
);
7173 /* Implementation of `siginfo' variable. */
7175 static const struct internalvar_funcs siginfo_funcs
=
7183 _initialize_infrun (void)
7187 struct cmd_list_element
*c
;
7189 add_info ("signals", signals_info
, _("\
7190 What debugger does when program gets various signals.\n\
7191 Specify a signal as argument to print info on that signal only."));
7192 add_info_alias ("handle", "signals", 0);
7194 c
= add_com ("handle", class_run
, handle_command
, _("\
7195 Specify how to handle signals.\n\
7196 Usage: handle SIGNAL [ACTIONS]\n\
7197 Args are signals and actions to apply to those signals.\n\
7198 If no actions are specified, the current settings for the specified signals\n\
7199 will be displayed instead.\n\
7201 Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\
7202 from 1-15 are allowed for compatibility with old versions of GDB.\n\
7203 Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\
7204 The special arg \"all\" is recognized to mean all signals except those\n\
7205 used by the debugger, typically SIGTRAP and SIGINT.\n\
7207 Recognized actions include \"stop\", \"nostop\", \"print\", \"noprint\",\n\
7208 \"pass\", \"nopass\", \"ignore\", or \"noignore\".\n\
7209 Stop means reenter debugger if this signal happens (implies print).\n\
7210 Print means print a message if this signal happens.\n\
7211 Pass means let program see this signal; otherwise program doesn't know.\n\
7212 Ignore is a synonym for nopass and noignore is a synonym for pass.\n\
7213 Pass and Stop may be combined.\n\
7215 Multiple signals may be specified. Signal numbers and signal names\n\
7216 may be interspersed with actions, with the actions being performed for\n\
7217 all signals cumulatively specified."));
7218 set_cmd_completer (c
, handle_completer
);
7222 add_com ("lz", class_info
, signals_info
, _("\
7223 What debugger does when program gets various signals.\n\
7224 Specify a signal as argument to print info on that signal only."));
7225 add_com ("z", class_run
, xdb_handle_command
, _("\
7226 Specify how to handle a signal.\n\
7227 Args are signals and actions to apply to those signals.\n\
7228 Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\
7229 from 1-15 are allowed for compatibility with old versions of GDB.\n\
7230 Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\
7231 The special arg \"all\" is recognized to mean all signals except those\n\
7232 used by the debugger, typically SIGTRAP and SIGINT.\n\
7233 Recognized actions include \"s\" (toggles between stop and nostop),\n\
7234 \"r\" (toggles between print and noprint), \"i\" (toggles between pass and \
7235 nopass), \"Q\" (noprint)\n\
7236 Stop means reenter debugger if this signal happens (implies print).\n\
7237 Print means print a message if this signal happens.\n\
7238 Pass means let program see this signal; otherwise program doesn't know.\n\
7239 Ignore is a synonym for nopass and noignore is a synonym for pass.\n\
7240 Pass and Stop may be combined."));
7244 stop_command
= add_cmd ("stop", class_obscure
,
7245 not_just_help_class_command
, _("\
7246 There is no `stop' command, but you can set a hook on `stop'.\n\
7247 This allows you to set a list of commands to be run each time execution\n\
7248 of the program stops."), &cmdlist
);
7250 add_setshow_zuinteger_cmd ("infrun", class_maintenance
, &debug_infrun
, _("\
7251 Set inferior debugging."), _("\
7252 Show inferior debugging."), _("\
7253 When non-zero, inferior specific debugging is enabled."),
7256 &setdebuglist
, &showdebuglist
);
7258 add_setshow_boolean_cmd ("displaced", class_maintenance
,
7259 &debug_displaced
, _("\
7260 Set displaced stepping debugging."), _("\
7261 Show displaced stepping debugging."), _("\
7262 When non-zero, displaced stepping specific debugging is enabled."),
7264 show_debug_displaced
,
7265 &setdebuglist
, &showdebuglist
);
7267 add_setshow_boolean_cmd ("non-stop", no_class
,
7269 Set whether gdb controls the inferior in non-stop mode."), _("\
7270 Show whether gdb controls the inferior in non-stop mode."), _("\
7271 When debugging a multi-threaded program and this setting is\n\
7272 off (the default, also called all-stop mode), when one thread stops\n\
7273 (for a breakpoint, watchpoint, exception, or similar events), GDB stops\n\
7274 all other threads in the program while you interact with the thread of\n\
7275 interest. When you continue or step a thread, you can allow the other\n\
7276 threads to run, or have them remain stopped, but while you inspect any\n\
7277 thread's state, all threads stop.\n\
7279 In non-stop mode, when one thread stops, other threads can continue\n\
7280 to run freely. You'll be able to step each thread independently,\n\
7281 leave it stopped or free to run as needed."),
7287 numsigs
= (int) GDB_SIGNAL_LAST
;
7288 signal_stop
= (unsigned char *) xmalloc (sizeof (signal_stop
[0]) * numsigs
);
7289 signal_print
= (unsigned char *)
7290 xmalloc (sizeof (signal_print
[0]) * numsigs
);
7291 signal_program
= (unsigned char *)
7292 xmalloc (sizeof (signal_program
[0]) * numsigs
);
7293 signal_catch
= (unsigned char *)
7294 xmalloc (sizeof (signal_catch
[0]) * numsigs
);
7295 signal_pass
= (unsigned char *)
7296 xmalloc (sizeof (signal_program
[0]) * numsigs
);
7297 for (i
= 0; i
< numsigs
; i
++)
7300 signal_print
[i
] = 1;
7301 signal_program
[i
] = 1;
7302 signal_catch
[i
] = 0;
7305 /* Signals caused by debugger's own actions
7306 should not be given to the program afterwards. */
7307 signal_program
[GDB_SIGNAL_TRAP
] = 0;
7308 signal_program
[GDB_SIGNAL_INT
] = 0;
7310 /* Signals that are not errors should not normally enter the debugger. */
7311 signal_stop
[GDB_SIGNAL_ALRM
] = 0;
7312 signal_print
[GDB_SIGNAL_ALRM
] = 0;
7313 signal_stop
[GDB_SIGNAL_VTALRM
] = 0;
7314 signal_print
[GDB_SIGNAL_VTALRM
] = 0;
7315 signal_stop
[GDB_SIGNAL_PROF
] = 0;
7316 signal_print
[GDB_SIGNAL_PROF
] = 0;
7317 signal_stop
[GDB_SIGNAL_CHLD
] = 0;
7318 signal_print
[GDB_SIGNAL_CHLD
] = 0;
7319 signal_stop
[GDB_SIGNAL_IO
] = 0;
7320 signal_print
[GDB_SIGNAL_IO
] = 0;
7321 signal_stop
[GDB_SIGNAL_POLL
] = 0;
7322 signal_print
[GDB_SIGNAL_POLL
] = 0;
7323 signal_stop
[GDB_SIGNAL_URG
] = 0;
7324 signal_print
[GDB_SIGNAL_URG
] = 0;
7325 signal_stop
[GDB_SIGNAL_WINCH
] = 0;
7326 signal_print
[GDB_SIGNAL_WINCH
] = 0;
7327 signal_stop
[GDB_SIGNAL_PRIO
] = 0;
7328 signal_print
[GDB_SIGNAL_PRIO
] = 0;
7330 /* These signals are used internally by user-level thread
7331 implementations. (See signal(5) on Solaris.) Like the above
7332 signals, a healthy program receives and handles them as part of
7333 its normal operation. */
7334 signal_stop
[GDB_SIGNAL_LWP
] = 0;
7335 signal_print
[GDB_SIGNAL_LWP
] = 0;
7336 signal_stop
[GDB_SIGNAL_WAITING
] = 0;
7337 signal_print
[GDB_SIGNAL_WAITING
] = 0;
7338 signal_stop
[GDB_SIGNAL_CANCEL
] = 0;
7339 signal_print
[GDB_SIGNAL_CANCEL
] = 0;
7341 /* Update cached state. */
7342 signal_cache_update (-1);
7344 add_setshow_zinteger_cmd ("stop-on-solib-events", class_support
,
7345 &stop_on_solib_events
, _("\
7346 Set stopping for shared library events."), _("\
7347 Show stopping for shared library events."), _("\
7348 If nonzero, gdb will give control to the user when the dynamic linker\n\
7349 notifies gdb of shared library events. The most common event of interest\n\
7350 to the user would be loading/unloading of a new library."),
7351 set_stop_on_solib_events
,
7352 show_stop_on_solib_events
,
7353 &setlist
, &showlist
);
7355 add_setshow_enum_cmd ("follow-fork-mode", class_run
,
7356 follow_fork_mode_kind_names
,
7357 &follow_fork_mode_string
, _("\
7358 Set debugger response to a program call of fork or vfork."), _("\
7359 Show debugger response to a program call of fork or vfork."), _("\
7360 A fork or vfork creates a new process. follow-fork-mode can be:\n\
7361 parent - the original process is debugged after a fork\n\
7362 child - the new process is debugged after a fork\n\
7363 The unfollowed process will continue to run.\n\
7364 By default, the debugger will follow the parent process."),
7366 show_follow_fork_mode_string
,
7367 &setlist
, &showlist
);
7369 add_setshow_enum_cmd ("follow-exec-mode", class_run
,
7370 follow_exec_mode_names
,
7371 &follow_exec_mode_string
, _("\
7372 Set debugger response to a program call of exec."), _("\
7373 Show debugger response to a program call of exec."), _("\
7374 An exec call replaces the program image of a process.\n\
7376 follow-exec-mode can be:\n\
7378 new - the debugger creates a new inferior and rebinds the process\n\
7379 to this new inferior. The program the process was running before\n\
7380 the exec call can be restarted afterwards by restarting the original\n\
7383 same - the debugger keeps the process bound to the same inferior.\n\
7384 The new executable image replaces the previous executable loaded in\n\
7385 the inferior. Restarting the inferior after the exec call restarts\n\
7386 the executable the process was running after the exec call.\n\
7388 By default, the debugger will use the same inferior."),
7390 show_follow_exec_mode_string
,
7391 &setlist
, &showlist
);
7393 add_setshow_enum_cmd ("scheduler-locking", class_run
,
7394 scheduler_enums
, &scheduler_mode
, _("\
7395 Set mode for locking scheduler during execution."), _("\
7396 Show mode for locking scheduler during execution."), _("\
7397 off == no locking (threads may preempt at any time)\n\
7398 on == full locking (no thread except the current thread may run)\n\
7399 step == scheduler locked during every single-step operation.\n\
7400 In this mode, no other thread may run during a step command.\n\
7401 Other threads may run while stepping over a function call ('next')."),
7402 set_schedlock_func
, /* traps on target vector */
7403 show_scheduler_mode
,
7404 &setlist
, &showlist
);
7406 add_setshow_boolean_cmd ("schedule-multiple", class_run
, &sched_multi
, _("\
7407 Set mode for resuming threads of all processes."), _("\
7408 Show mode for resuming threads of all processes."), _("\
7409 When on, execution commands (such as 'continue' or 'next') resume all\n\
7410 threads of all processes. When off (which is the default), execution\n\
7411 commands only resume the threads of the current process. The set of\n\
7412 threads that are resumed is further refined by the scheduler-locking\n\
7413 mode (see help set scheduler-locking)."),
7415 show_schedule_multiple
,
7416 &setlist
, &showlist
);
7418 add_setshow_boolean_cmd ("step-mode", class_run
, &step_stop_if_no_debug
, _("\
7419 Set mode of the step operation."), _("\
7420 Show mode of the step operation."), _("\
7421 When set, doing a step over a function without debug line information\n\
7422 will stop at the first instruction of that function. Otherwise, the\n\
7423 function is skipped and the step command stops at a different source line."),
7425 show_step_stop_if_no_debug
,
7426 &setlist
, &showlist
);
7428 add_setshow_auto_boolean_cmd ("displaced-stepping", class_run
,
7429 &can_use_displaced_stepping
, _("\
7430 Set debugger's willingness to use displaced stepping."), _("\
7431 Show debugger's willingness to use displaced stepping."), _("\
7432 If on, gdb will use displaced stepping to step over breakpoints if it is\n\
7433 supported by the target architecture. If off, gdb will not use displaced\n\
7434 stepping to step over breakpoints, even if such is supported by the target\n\
7435 architecture. If auto (which is the default), gdb will use displaced stepping\n\
7436 if the target architecture supports it and non-stop mode is active, but will not\n\
7437 use it in all-stop mode (see help set non-stop)."),
7439 show_can_use_displaced_stepping
,
7440 &setlist
, &showlist
);
7442 add_setshow_enum_cmd ("exec-direction", class_run
, exec_direction_names
,
7443 &exec_direction
, _("Set direction of execution.\n\
7444 Options are 'forward' or 'reverse'."),
7445 _("Show direction of execution (forward/reverse)."),
7446 _("Tells gdb whether to execute forward or backward."),
7447 set_exec_direction_func
, show_exec_direction_func
,
7448 &setlist
, &showlist
);
7450 /* Set/show detach-on-fork: user-settable mode. */
7452 add_setshow_boolean_cmd ("detach-on-fork", class_run
, &detach_fork
, _("\
7453 Set whether gdb will detach the child of a fork."), _("\
7454 Show whether gdb will detach the child of a fork."), _("\
7455 Tells gdb whether to detach the child of a fork."),
7456 NULL
, NULL
, &setlist
, &showlist
);
7458 /* Set/show disable address space randomization mode. */
7460 add_setshow_boolean_cmd ("disable-randomization", class_support
,
7461 &disable_randomization
, _("\
7462 Set disabling of debuggee's virtual address space randomization."), _("\
7463 Show disabling of debuggee's virtual address space randomization."), _("\
7464 When this mode is on (which is the default), randomization of the virtual\n\
7465 address space is disabled. Standalone programs run with the randomization\n\
7466 enabled by default on some platforms."),
7467 &set_disable_randomization
,
7468 &show_disable_randomization
,
7469 &setlist
, &showlist
);
7471 /* ptid initializations */
7472 inferior_ptid
= null_ptid
;
7473 target_last_wait_ptid
= minus_one_ptid
;
7475 observer_attach_thread_ptid_changed (infrun_thread_ptid_changed
);
7476 observer_attach_thread_stop_requested (infrun_thread_stop_requested
);
7477 observer_attach_thread_exit (infrun_thread_thread_exit
);
7478 observer_attach_inferior_exit (infrun_inferior_exit
);
7480 /* Explicitly create without lookup, since that tries to create a
7481 value with a void typed value, and when we get here, gdbarch
7482 isn't initialized yet. At this point, we're quite sure there
7483 isn't another convenience variable of the same name. */
7484 create_internalvar_type_lazy ("_siginfo", &siginfo_funcs
, NULL
);
7486 add_setshow_boolean_cmd ("observer", no_class
,
7487 &observer_mode_1
, _("\
7488 Set whether gdb controls the inferior in observer mode."), _("\
7489 Show whether gdb controls the inferior in observer mode."), _("\
7490 In observer mode, GDB can get data from the inferior, but not\n\
7491 affect its execution. Registers and memory may not be changed,\n\
7492 breakpoints may not be set, and the program cannot be interrupted\n\