1 /* Target-struct-independent code to start (run) and stop an inferior
4 Copyright (C) 1986-2015 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/>. */
27 #include "breakpoint.h"
31 #include "cli/cli-script.h"
33 #include "gdbthread.h"
45 #include "dictionary.h"
47 #include "mi/mi-common.h"
48 #include "event-top.h"
50 #include "record-full.h"
51 #include "inline-frame.h"
53 #include "tracepoint.h"
54 #include "continuations.h"
59 #include "completer.h"
60 #include "target-descriptions.h"
61 #include "target-dcache.h"
64 #include "event-loop.h"
66 /* Prototypes for local functions */
68 static void signals_info (char *, int);
70 static void handle_command (char *, int);
72 static void sig_print_info (enum gdb_signal
);
74 static void sig_print_header (void);
76 static void resume_cleanups (void *);
78 static int hook_stop_stub (void *);
80 static int restore_selected_frame (void *);
82 static int follow_fork (void);
84 static int follow_fork_inferior (int follow_child
, int detach_fork
);
86 static void follow_inferior_reset_breakpoints (void);
88 static void set_schedlock_func (char *args
, int from_tty
,
89 struct cmd_list_element
*c
);
91 static int currently_stepping (struct thread_info
*tp
);
93 void _initialize_infrun (void);
95 void nullify_last_target_wait_ptid (void);
97 static void insert_hp_step_resume_breakpoint_at_frame (struct frame_info
*);
99 static void insert_step_resume_breakpoint_at_caller (struct frame_info
*);
101 static void insert_longjmp_resume_breakpoint (struct gdbarch
*, CORE_ADDR
);
103 static int maybe_software_singlestep (struct gdbarch
*gdbarch
, CORE_ADDR pc
);
105 /* Asynchronous signal handler registered as event loop source for
106 when we have pending events ready to be passed to the core. */
107 static struct async_event_handler
*infrun_async_inferior_event_token
;
109 /* Stores whether infrun_async was previously enabled or disabled.
110 Starts off as -1, indicating "never enabled/disabled". */
111 static int infrun_is_async
= -1;
116 infrun_async (int enable
)
118 if (infrun_is_async
!= enable
)
120 infrun_is_async
= enable
;
123 fprintf_unfiltered (gdb_stdlog
,
124 "infrun: infrun_async(%d)\n",
128 mark_async_event_handler (infrun_async_inferior_event_token
);
130 clear_async_event_handler (infrun_async_inferior_event_token
);
134 /* When set, stop the 'step' command if we enter a function which has
135 no line number information. The normal behavior is that we step
136 over such function. */
137 int step_stop_if_no_debug
= 0;
139 show_step_stop_if_no_debug (struct ui_file
*file
, int from_tty
,
140 struct cmd_list_element
*c
, const char *value
)
142 fprintf_filtered (file
, _("Mode of the step operation is %s.\n"), value
);
145 /* In asynchronous mode, but simulating synchronous execution. */
147 int sync_execution
= 0;
149 /* proceed and normal_stop use this to notify the user when the
150 inferior stopped in a different thread than it had been running
153 static ptid_t previous_inferior_ptid
;
155 /* If set (default for legacy reasons), when following a fork, GDB
156 will detach from one of the fork branches, child or parent.
157 Exactly which branch is detached depends on 'set follow-fork-mode'
160 static int detach_fork
= 1;
162 int debug_displaced
= 0;
164 show_debug_displaced (struct ui_file
*file
, int from_tty
,
165 struct cmd_list_element
*c
, const char *value
)
167 fprintf_filtered (file
, _("Displace stepping debugging is %s.\n"), value
);
170 unsigned int debug_infrun
= 0;
172 show_debug_infrun (struct ui_file
*file
, int from_tty
,
173 struct cmd_list_element
*c
, const char *value
)
175 fprintf_filtered (file
, _("Inferior debugging is %s.\n"), value
);
179 /* Support for disabling address space randomization. */
181 int disable_randomization
= 1;
184 show_disable_randomization (struct ui_file
*file
, int from_tty
,
185 struct cmd_list_element
*c
, const char *value
)
187 if (target_supports_disable_randomization ())
188 fprintf_filtered (file
,
189 _("Disabling randomization of debuggee's "
190 "virtual address space is %s.\n"),
193 fputs_filtered (_("Disabling randomization of debuggee's "
194 "virtual address space is unsupported on\n"
195 "this platform.\n"), file
);
199 set_disable_randomization (char *args
, int from_tty
,
200 struct cmd_list_element
*c
)
202 if (!target_supports_disable_randomization ())
203 error (_("Disabling randomization of debuggee's "
204 "virtual address space is unsupported on\n"
208 /* User interface for non-stop mode. */
211 static int non_stop_1
= 0;
214 set_non_stop (char *args
, int from_tty
,
215 struct cmd_list_element
*c
)
217 if (target_has_execution
)
219 non_stop_1
= non_stop
;
220 error (_("Cannot change this setting while the inferior is running."));
223 non_stop
= non_stop_1
;
227 show_non_stop (struct ui_file
*file
, int from_tty
,
228 struct cmd_list_element
*c
, const char *value
)
230 fprintf_filtered (file
,
231 _("Controlling the inferior in non-stop mode is %s.\n"),
235 /* "Observer mode" is somewhat like a more extreme version of
236 non-stop, in which all GDB operations that might affect the
237 target's execution have been disabled. */
239 int observer_mode
= 0;
240 static int observer_mode_1
= 0;
243 set_observer_mode (char *args
, int from_tty
,
244 struct cmd_list_element
*c
)
246 if (target_has_execution
)
248 observer_mode_1
= observer_mode
;
249 error (_("Cannot change this setting while the inferior is running."));
252 observer_mode
= observer_mode_1
;
254 may_write_registers
= !observer_mode
;
255 may_write_memory
= !observer_mode
;
256 may_insert_breakpoints
= !observer_mode
;
257 may_insert_tracepoints
= !observer_mode
;
258 /* We can insert fast tracepoints in or out of observer mode,
259 but enable them if we're going into this mode. */
261 may_insert_fast_tracepoints
= 1;
262 may_stop
= !observer_mode
;
263 update_target_permissions ();
265 /* Going *into* observer mode we must force non-stop, then
266 going out we leave it that way. */
269 pagination_enabled
= 0;
270 non_stop
= non_stop_1
= 1;
274 printf_filtered (_("Observer mode is now %s.\n"),
275 (observer_mode
? "on" : "off"));
279 show_observer_mode (struct ui_file
*file
, int from_tty
,
280 struct cmd_list_element
*c
, const char *value
)
282 fprintf_filtered (file
, _("Observer mode is %s.\n"), value
);
285 /* This updates the value of observer mode based on changes in
286 permissions. Note that we are deliberately ignoring the values of
287 may-write-registers and may-write-memory, since the user may have
288 reason to enable these during a session, for instance to turn on a
289 debugging-related global. */
292 update_observer_mode (void)
296 newval
= (!may_insert_breakpoints
297 && !may_insert_tracepoints
298 && may_insert_fast_tracepoints
302 /* Let the user know if things change. */
303 if (newval
!= observer_mode
)
304 printf_filtered (_("Observer mode is now %s.\n"),
305 (newval
? "on" : "off"));
307 observer_mode
= observer_mode_1
= newval
;
310 /* Tables of how to react to signals; the user sets them. */
312 static unsigned char *signal_stop
;
313 static unsigned char *signal_print
;
314 static unsigned char *signal_program
;
316 /* Table of signals that are registered with "catch signal". A
317 non-zero entry indicates that the signal is caught by some "catch
318 signal" command. This has size GDB_SIGNAL_LAST, to accommodate all
320 static unsigned char *signal_catch
;
322 /* Table of signals that the target may silently handle.
323 This is automatically determined from the flags above,
324 and simply cached here. */
325 static unsigned char *signal_pass
;
327 #define SET_SIGS(nsigs,sigs,flags) \
329 int signum = (nsigs); \
330 while (signum-- > 0) \
331 if ((sigs)[signum]) \
332 (flags)[signum] = 1; \
335 #define UNSET_SIGS(nsigs,sigs,flags) \
337 int signum = (nsigs); \
338 while (signum-- > 0) \
339 if ((sigs)[signum]) \
340 (flags)[signum] = 0; \
343 /* Update the target's copy of SIGNAL_PROGRAM. The sole purpose of
344 this function is to avoid exporting `signal_program'. */
347 update_signals_program_target (void)
349 target_program_signals ((int) GDB_SIGNAL_LAST
, signal_program
);
352 /* Value to pass to target_resume() to cause all threads to resume. */
354 #define RESUME_ALL minus_one_ptid
356 /* Command list pointer for the "stop" placeholder. */
358 static struct cmd_list_element
*stop_command
;
360 /* Nonzero if we want to give control to the user when we're notified
361 of shared library events by the dynamic linker. */
362 int stop_on_solib_events
;
364 /* Enable or disable optional shared library event breakpoints
365 as appropriate when the above flag is changed. */
368 set_stop_on_solib_events (char *args
, int from_tty
, struct cmd_list_element
*c
)
370 update_solib_breakpoints ();
374 show_stop_on_solib_events (struct ui_file
*file
, int from_tty
,
375 struct cmd_list_element
*c
, const char *value
)
377 fprintf_filtered (file
, _("Stopping for shared library events is %s.\n"),
381 /* Nonzero means expecting a trace trap
382 and should stop the inferior and return silently when it happens. */
386 /* Nonzero after stop if current stack frame should be printed. */
388 static int stop_print_frame
;
390 /* This is a cached copy of the pid/waitstatus of the last event
391 returned by target_wait()/deprecated_target_wait_hook(). This
392 information is returned by get_last_target_status(). */
393 static ptid_t target_last_wait_ptid
;
394 static struct target_waitstatus target_last_waitstatus
;
396 static void context_switch (ptid_t ptid
);
398 void init_thread_stepping_state (struct thread_info
*tss
);
400 static const char follow_fork_mode_child
[] = "child";
401 static const char follow_fork_mode_parent
[] = "parent";
403 static const char *const follow_fork_mode_kind_names
[] = {
404 follow_fork_mode_child
,
405 follow_fork_mode_parent
,
409 static const char *follow_fork_mode_string
= follow_fork_mode_parent
;
411 show_follow_fork_mode_string (struct ui_file
*file
, int from_tty
,
412 struct cmd_list_element
*c
, const char *value
)
414 fprintf_filtered (file
,
415 _("Debugger response to a program "
416 "call of fork or vfork is \"%s\".\n"),
421 /* Handle changes to the inferior list based on the type of fork,
422 which process is being followed, and whether the other process
423 should be detached. On entry inferior_ptid must be the ptid of
424 the fork parent. At return inferior_ptid is the ptid of the
425 followed inferior. */
428 follow_fork_inferior (int follow_child
, int detach_fork
)
431 ptid_t parent_ptid
, child_ptid
;
433 has_vforked
= (inferior_thread ()->pending_follow
.kind
434 == TARGET_WAITKIND_VFORKED
);
435 parent_ptid
= inferior_ptid
;
436 child_ptid
= inferior_thread ()->pending_follow
.value
.related_pid
;
439 && !non_stop
/* Non-stop always resumes both branches. */
440 && (!target_is_async_p () || sync_execution
)
441 && !(follow_child
|| detach_fork
|| sched_multi
))
443 /* The parent stays blocked inside the vfork syscall until the
444 child execs or exits. If we don't let the child run, then
445 the parent stays blocked. If we're telling the parent to run
446 in the foreground, the user will not be able to ctrl-c to get
447 back the terminal, effectively hanging the debug session. */
448 fprintf_filtered (gdb_stderr
, _("\
449 Can not resume the parent process over vfork in the foreground while\n\
450 holding the child stopped. Try \"set detach-on-fork\" or \
451 \"set schedule-multiple\".\n"));
452 /* FIXME output string > 80 columns. */
458 /* Detach new forked process? */
461 struct cleanup
*old_chain
;
463 /* Before detaching from the child, remove all breakpoints
464 from it. If we forked, then this has already been taken
465 care of by infrun.c. If we vforked however, any
466 breakpoint inserted in the parent is visible in the
467 child, even those added while stopped in a vfork
468 catchpoint. This will remove the breakpoints from the
469 parent also, but they'll be reinserted below. */
472 /* Keep breakpoints list in sync. */
473 remove_breakpoints_pid (ptid_get_pid (inferior_ptid
));
476 if (info_verbose
|| debug_infrun
)
478 /* Ensure that we have a process ptid. */
479 ptid_t process_ptid
= pid_to_ptid (ptid_get_pid (child_ptid
));
481 target_terminal_ours_for_output ();
482 fprintf_filtered (gdb_stdlog
,
483 _("Detaching after %s from child %s.\n"),
484 has_vforked
? "vfork" : "fork",
485 target_pid_to_str (process_ptid
));
490 struct inferior
*parent_inf
, *child_inf
;
491 struct cleanup
*old_chain
;
493 /* Add process to GDB's tables. */
494 child_inf
= add_inferior (ptid_get_pid (child_ptid
));
496 parent_inf
= current_inferior ();
497 child_inf
->attach_flag
= parent_inf
->attach_flag
;
498 copy_terminal_info (child_inf
, parent_inf
);
499 child_inf
->gdbarch
= parent_inf
->gdbarch
;
500 copy_inferior_target_desc_info (child_inf
, parent_inf
);
502 old_chain
= save_inferior_ptid ();
503 save_current_program_space ();
505 inferior_ptid
= child_ptid
;
506 add_thread (inferior_ptid
);
507 child_inf
->symfile_flags
= SYMFILE_NO_READ
;
509 /* If this is a vfork child, then the address-space is
510 shared with the parent. */
513 child_inf
->pspace
= parent_inf
->pspace
;
514 child_inf
->aspace
= parent_inf
->aspace
;
516 /* The parent will be frozen until the child is done
517 with the shared region. Keep track of the
519 child_inf
->vfork_parent
= parent_inf
;
520 child_inf
->pending_detach
= 0;
521 parent_inf
->vfork_child
= child_inf
;
522 parent_inf
->pending_detach
= 0;
526 child_inf
->aspace
= new_address_space ();
527 child_inf
->pspace
= add_program_space (child_inf
->aspace
);
528 child_inf
->removable
= 1;
529 set_current_program_space (child_inf
->pspace
);
530 clone_program_space (child_inf
->pspace
, parent_inf
->pspace
);
532 /* Let the shared library layer (e.g., solib-svr4) learn
533 about this new process, relocate the cloned exec, pull
534 in shared libraries, and install the solib event
535 breakpoint. If a "cloned-VM" event was propagated
536 better throughout the core, this wouldn't be
538 solib_create_inferior_hook (0);
541 do_cleanups (old_chain
);
546 struct inferior
*parent_inf
;
548 parent_inf
= current_inferior ();
550 /* If we detached from the child, then we have to be careful
551 to not insert breakpoints in the parent until the child
552 is done with the shared memory region. However, if we're
553 staying attached to the child, then we can and should
554 insert breakpoints, so that we can debug it. A
555 subsequent child exec or exit is enough to know when does
556 the child stops using the parent's address space. */
557 parent_inf
->waiting_for_vfork_done
= detach_fork
;
558 parent_inf
->pspace
->breakpoints_not_allowed
= detach_fork
;
563 /* Follow the child. */
564 struct inferior
*parent_inf
, *child_inf
;
565 struct program_space
*parent_pspace
;
567 if (info_verbose
|| debug_infrun
)
569 target_terminal_ours_for_output ();
570 fprintf_filtered (gdb_stdlog
,
571 _("Attaching after %s %s to child %s.\n"),
572 target_pid_to_str (parent_ptid
),
573 has_vforked
? "vfork" : "fork",
574 target_pid_to_str (child_ptid
));
577 /* Add the new inferior first, so that the target_detach below
578 doesn't unpush the target. */
580 child_inf
= add_inferior (ptid_get_pid (child_ptid
));
582 parent_inf
= current_inferior ();
583 child_inf
->attach_flag
= parent_inf
->attach_flag
;
584 copy_terminal_info (child_inf
, parent_inf
);
585 child_inf
->gdbarch
= parent_inf
->gdbarch
;
586 copy_inferior_target_desc_info (child_inf
, parent_inf
);
588 parent_pspace
= parent_inf
->pspace
;
590 /* If we're vforking, we want to hold on to the parent until the
591 child exits or execs. At child exec or exit time we can
592 remove the old breakpoints from the parent and detach or
593 resume debugging it. Otherwise, detach the parent now; we'll
594 want to reuse it's program/address spaces, but we can't set
595 them to the child before removing breakpoints from the
596 parent, otherwise, the breakpoints module could decide to
597 remove breakpoints from the wrong process (since they'd be
598 assigned to the same address space). */
602 gdb_assert (child_inf
->vfork_parent
== NULL
);
603 gdb_assert (parent_inf
->vfork_child
== NULL
);
604 child_inf
->vfork_parent
= parent_inf
;
605 child_inf
->pending_detach
= 0;
606 parent_inf
->vfork_child
= child_inf
;
607 parent_inf
->pending_detach
= detach_fork
;
608 parent_inf
->waiting_for_vfork_done
= 0;
610 else if (detach_fork
)
612 if (info_verbose
|| debug_infrun
)
614 /* Ensure that we have a process ptid. */
615 ptid_t process_ptid
= pid_to_ptid (ptid_get_pid (child_ptid
));
617 target_terminal_ours_for_output ();
618 fprintf_filtered (gdb_stdlog
,
619 _("Detaching after fork from "
621 target_pid_to_str (process_ptid
));
624 target_detach (NULL
, 0);
627 /* Note that the detach above makes PARENT_INF dangling. */
629 /* Add the child thread to the appropriate lists, and switch to
630 this new thread, before cloning the program space, and
631 informing the solib layer about this new process. */
633 inferior_ptid
= child_ptid
;
634 add_thread (inferior_ptid
);
636 /* If this is a vfork child, then the address-space is shared
637 with the parent. If we detached from the parent, then we can
638 reuse the parent's program/address spaces. */
639 if (has_vforked
|| detach_fork
)
641 child_inf
->pspace
= parent_pspace
;
642 child_inf
->aspace
= child_inf
->pspace
->aspace
;
646 child_inf
->aspace
= new_address_space ();
647 child_inf
->pspace
= add_program_space (child_inf
->aspace
);
648 child_inf
->removable
= 1;
649 child_inf
->symfile_flags
= SYMFILE_NO_READ
;
650 set_current_program_space (child_inf
->pspace
);
651 clone_program_space (child_inf
->pspace
, parent_pspace
);
653 /* Let the shared library layer (e.g., solib-svr4) learn
654 about this new process, relocate the cloned exec, pull in
655 shared libraries, and install the solib event breakpoint.
656 If a "cloned-VM" event was propagated better throughout
657 the core, this wouldn't be required. */
658 solib_create_inferior_hook (0);
662 return target_follow_fork (follow_child
, detach_fork
);
665 /* Tell the target to follow the fork we're stopped at. Returns true
666 if the inferior should be resumed; false, if the target for some
667 reason decided it's best not to resume. */
672 int follow_child
= (follow_fork_mode_string
== follow_fork_mode_child
);
673 int should_resume
= 1;
674 struct thread_info
*tp
;
676 /* Copy user stepping state to the new inferior thread. FIXME: the
677 followed fork child thread should have a copy of most of the
678 parent thread structure's run control related fields, not just these.
679 Initialized to avoid "may be used uninitialized" warnings from gcc. */
680 struct breakpoint
*step_resume_breakpoint
= NULL
;
681 struct breakpoint
*exception_resume_breakpoint
= NULL
;
682 CORE_ADDR step_range_start
= 0;
683 CORE_ADDR step_range_end
= 0;
684 struct frame_id step_frame_id
= { 0 };
685 struct interp
*command_interp
= NULL
;
690 struct target_waitstatus wait_status
;
692 /* Get the last target status returned by target_wait(). */
693 get_last_target_status (&wait_ptid
, &wait_status
);
695 /* If not stopped at a fork event, then there's nothing else to
697 if (wait_status
.kind
!= TARGET_WAITKIND_FORKED
698 && wait_status
.kind
!= TARGET_WAITKIND_VFORKED
)
701 /* Check if we switched over from WAIT_PTID, since the event was
703 if (!ptid_equal (wait_ptid
, minus_one_ptid
)
704 && !ptid_equal (inferior_ptid
, wait_ptid
))
706 /* We did. Switch back to WAIT_PTID thread, to tell the
707 target to follow it (in either direction). We'll
708 afterwards refuse to resume, and inform the user what
710 switch_to_thread (wait_ptid
);
715 tp
= inferior_thread ();
717 /* If there were any forks/vforks that were caught and are now to be
718 followed, then do so now. */
719 switch (tp
->pending_follow
.kind
)
721 case TARGET_WAITKIND_FORKED
:
722 case TARGET_WAITKIND_VFORKED
:
724 ptid_t parent
, child
;
726 /* If the user did a next/step, etc, over a fork call,
727 preserve the stepping state in the fork child. */
728 if (follow_child
&& should_resume
)
730 step_resume_breakpoint
= clone_momentary_breakpoint
731 (tp
->control
.step_resume_breakpoint
);
732 step_range_start
= tp
->control
.step_range_start
;
733 step_range_end
= tp
->control
.step_range_end
;
734 step_frame_id
= tp
->control
.step_frame_id
;
735 exception_resume_breakpoint
736 = clone_momentary_breakpoint (tp
->control
.exception_resume_breakpoint
);
737 command_interp
= tp
->control
.command_interp
;
739 /* For now, delete the parent's sr breakpoint, otherwise,
740 parent/child sr breakpoints are considered duplicates,
741 and the child version will not be installed. Remove
742 this when the breakpoints module becomes aware of
743 inferiors and address spaces. */
744 delete_step_resume_breakpoint (tp
);
745 tp
->control
.step_range_start
= 0;
746 tp
->control
.step_range_end
= 0;
747 tp
->control
.step_frame_id
= null_frame_id
;
748 delete_exception_resume_breakpoint (tp
);
749 tp
->control
.command_interp
= NULL
;
752 parent
= inferior_ptid
;
753 child
= tp
->pending_follow
.value
.related_pid
;
755 /* Set up inferior(s) as specified by the caller, and tell the
756 target to do whatever is necessary to follow either parent
758 if (follow_fork_inferior (follow_child
, detach_fork
))
760 /* Target refused to follow, or there's some other reason
761 we shouldn't resume. */
766 /* This pending follow fork event is now handled, one way
767 or another. The previous selected thread may be gone
768 from the lists by now, but if it is still around, need
769 to clear the pending follow request. */
770 tp
= find_thread_ptid (parent
);
772 tp
->pending_follow
.kind
= TARGET_WAITKIND_SPURIOUS
;
774 /* This makes sure we don't try to apply the "Switched
775 over from WAIT_PID" logic above. */
776 nullify_last_target_wait_ptid ();
778 /* If we followed the child, switch to it... */
781 switch_to_thread (child
);
783 /* ... and preserve the stepping state, in case the
784 user was stepping over the fork call. */
787 tp
= inferior_thread ();
788 tp
->control
.step_resume_breakpoint
789 = step_resume_breakpoint
;
790 tp
->control
.step_range_start
= step_range_start
;
791 tp
->control
.step_range_end
= step_range_end
;
792 tp
->control
.step_frame_id
= step_frame_id
;
793 tp
->control
.exception_resume_breakpoint
794 = exception_resume_breakpoint
;
795 tp
->control
.command_interp
= command_interp
;
799 /* If we get here, it was because we're trying to
800 resume from a fork catchpoint, but, the user
801 has switched threads away from the thread that
802 forked. In that case, the resume command
803 issued is most likely not applicable to the
804 child, so just warn, and refuse to resume. */
805 warning (_("Not resuming: switched threads "
806 "before following fork child."));
809 /* Reset breakpoints in the child as appropriate. */
810 follow_inferior_reset_breakpoints ();
813 switch_to_thread (parent
);
817 case TARGET_WAITKIND_SPURIOUS
:
818 /* Nothing to follow. */
821 internal_error (__FILE__
, __LINE__
,
822 "Unexpected pending_follow.kind %d\n",
823 tp
->pending_follow
.kind
);
827 return should_resume
;
831 follow_inferior_reset_breakpoints (void)
833 struct thread_info
*tp
= inferior_thread ();
835 /* Was there a step_resume breakpoint? (There was if the user
836 did a "next" at the fork() call.) If so, explicitly reset its
837 thread number. Cloned step_resume breakpoints are disabled on
838 creation, so enable it here now that it is associated with the
841 step_resumes are a form of bp that are made to be per-thread.
842 Since we created the step_resume bp when the parent process
843 was being debugged, and now are switching to the child process,
844 from the breakpoint package's viewpoint, that's a switch of
845 "threads". We must update the bp's notion of which thread
846 it is for, or it'll be ignored when it triggers. */
848 if (tp
->control
.step_resume_breakpoint
)
850 breakpoint_re_set_thread (tp
->control
.step_resume_breakpoint
);
851 tp
->control
.step_resume_breakpoint
->loc
->enabled
= 1;
854 /* Treat exception_resume breakpoints like step_resume breakpoints. */
855 if (tp
->control
.exception_resume_breakpoint
)
857 breakpoint_re_set_thread (tp
->control
.exception_resume_breakpoint
);
858 tp
->control
.exception_resume_breakpoint
->loc
->enabled
= 1;
861 /* Reinsert all breakpoints in the child. The user may have set
862 breakpoints after catching the fork, in which case those
863 were never set in the child, but only in the parent. This makes
864 sure the inserted breakpoints match the breakpoint list. */
866 breakpoint_re_set ();
867 insert_breakpoints ();
870 /* The child has exited or execed: resume threads of the parent the
871 user wanted to be executing. */
874 proceed_after_vfork_done (struct thread_info
*thread
,
877 int pid
= * (int *) arg
;
879 if (ptid_get_pid (thread
->ptid
) == pid
880 && is_running (thread
->ptid
)
881 && !is_executing (thread
->ptid
)
882 && !thread
->stop_requested
883 && thread
->suspend
.stop_signal
== GDB_SIGNAL_0
)
886 fprintf_unfiltered (gdb_stdlog
,
887 "infrun: resuming vfork parent thread %s\n",
888 target_pid_to_str (thread
->ptid
));
890 switch_to_thread (thread
->ptid
);
891 clear_proceed_status (0);
892 proceed ((CORE_ADDR
) -1, GDB_SIGNAL_DEFAULT
);
898 /* Called whenever we notice an exec or exit event, to handle
899 detaching or resuming a vfork parent. */
902 handle_vfork_child_exec_or_exit (int exec
)
904 struct inferior
*inf
= current_inferior ();
906 if (inf
->vfork_parent
)
908 int resume_parent
= -1;
910 /* This exec or exit marks the end of the shared memory region
911 between the parent and the child. If the user wanted to
912 detach from the parent, now is the time. */
914 if (inf
->vfork_parent
->pending_detach
)
916 struct thread_info
*tp
;
917 struct cleanup
*old_chain
;
918 struct program_space
*pspace
;
919 struct address_space
*aspace
;
921 /* follow-fork child, detach-on-fork on. */
923 inf
->vfork_parent
->pending_detach
= 0;
927 /* If we're handling a child exit, then inferior_ptid
928 points at the inferior's pid, not to a thread. */
929 old_chain
= save_inferior_ptid ();
930 save_current_program_space ();
931 save_current_inferior ();
934 old_chain
= save_current_space_and_thread ();
936 /* We're letting loose of the parent. */
937 tp
= any_live_thread_of_process (inf
->vfork_parent
->pid
);
938 switch_to_thread (tp
->ptid
);
940 /* We're about to detach from the parent, which implicitly
941 removes breakpoints from its address space. There's a
942 catch here: we want to reuse the spaces for the child,
943 but, parent/child are still sharing the pspace at this
944 point, although the exec in reality makes the kernel give
945 the child a fresh set of new pages. The problem here is
946 that the breakpoints module being unaware of this, would
947 likely chose the child process to write to the parent
948 address space. Swapping the child temporarily away from
949 the spaces has the desired effect. Yes, this is "sort
952 pspace
= inf
->pspace
;
953 aspace
= inf
->aspace
;
957 if (debug_infrun
|| info_verbose
)
959 target_terminal_ours_for_output ();
963 fprintf_filtered (gdb_stdlog
,
964 _("Detaching vfork parent process "
965 "%d after child exec.\n"),
966 inf
->vfork_parent
->pid
);
970 fprintf_filtered (gdb_stdlog
,
971 _("Detaching vfork parent process "
972 "%d after child exit.\n"),
973 inf
->vfork_parent
->pid
);
977 target_detach (NULL
, 0);
980 inf
->pspace
= pspace
;
981 inf
->aspace
= aspace
;
983 do_cleanups (old_chain
);
987 /* We're staying attached to the parent, so, really give the
988 child a new address space. */
989 inf
->pspace
= add_program_space (maybe_new_address_space ());
990 inf
->aspace
= inf
->pspace
->aspace
;
992 set_current_program_space (inf
->pspace
);
994 resume_parent
= inf
->vfork_parent
->pid
;
996 /* Break the bonds. */
997 inf
->vfork_parent
->vfork_child
= NULL
;
1001 struct cleanup
*old_chain
;
1002 struct program_space
*pspace
;
1004 /* If this is a vfork child exiting, then the pspace and
1005 aspaces were shared with the parent. Since we're
1006 reporting the process exit, we'll be mourning all that is
1007 found in the address space, and switching to null_ptid,
1008 preparing to start a new inferior. But, since we don't
1009 want to clobber the parent's address/program spaces, we
1010 go ahead and create a new one for this exiting
1013 /* Switch to null_ptid, so that clone_program_space doesn't want
1014 to read the selected frame of a dead process. */
1015 old_chain
= save_inferior_ptid ();
1016 inferior_ptid
= null_ptid
;
1018 /* This inferior is dead, so avoid giving the breakpoints
1019 module the option to write through to it (cloning a
1020 program space resets breakpoints). */
1023 pspace
= add_program_space (maybe_new_address_space ());
1024 set_current_program_space (pspace
);
1026 inf
->symfile_flags
= SYMFILE_NO_READ
;
1027 clone_program_space (pspace
, inf
->vfork_parent
->pspace
);
1028 inf
->pspace
= pspace
;
1029 inf
->aspace
= pspace
->aspace
;
1031 /* Put back inferior_ptid. We'll continue mourning this
1033 do_cleanups (old_chain
);
1035 resume_parent
= inf
->vfork_parent
->pid
;
1036 /* Break the bonds. */
1037 inf
->vfork_parent
->vfork_child
= NULL
;
1040 inf
->vfork_parent
= NULL
;
1042 gdb_assert (current_program_space
== inf
->pspace
);
1044 if (non_stop
&& resume_parent
!= -1)
1046 /* If the user wanted the parent to be running, let it go
1048 struct cleanup
*old_chain
= make_cleanup_restore_current_thread ();
1051 fprintf_unfiltered (gdb_stdlog
,
1052 "infrun: resuming vfork parent process %d\n",
1055 iterate_over_threads (proceed_after_vfork_done
, &resume_parent
);
1057 do_cleanups (old_chain
);
1062 /* Enum strings for "set|show follow-exec-mode". */
1064 static const char follow_exec_mode_new
[] = "new";
1065 static const char follow_exec_mode_same
[] = "same";
1066 static const char *const follow_exec_mode_names
[] =
1068 follow_exec_mode_new
,
1069 follow_exec_mode_same
,
1073 static const char *follow_exec_mode_string
= follow_exec_mode_same
;
1075 show_follow_exec_mode_string (struct ui_file
*file
, int from_tty
,
1076 struct cmd_list_element
*c
, const char *value
)
1078 fprintf_filtered (file
, _("Follow exec mode is \"%s\".\n"), value
);
1081 /* EXECD_PATHNAME is assumed to be non-NULL. */
1084 follow_exec (ptid_t ptid
, char *execd_pathname
)
1086 struct thread_info
*th
, *tmp
;
1087 struct inferior
*inf
= current_inferior ();
1088 int pid
= ptid_get_pid (ptid
);
1090 /* This is an exec event that we actually wish to pay attention to.
1091 Refresh our symbol table to the newly exec'd program, remove any
1092 momentary bp's, etc.
1094 If there are breakpoints, they aren't really inserted now,
1095 since the exec() transformed our inferior into a fresh set
1098 We want to preserve symbolic breakpoints on the list, since
1099 we have hopes that they can be reset after the new a.out's
1100 symbol table is read.
1102 However, any "raw" breakpoints must be removed from the list
1103 (e.g., the solib bp's), since their address is probably invalid
1106 And, we DON'T want to call delete_breakpoints() here, since
1107 that may write the bp's "shadow contents" (the instruction
1108 value that was overwritten witha TRAP instruction). Since
1109 we now have a new a.out, those shadow contents aren't valid. */
1111 mark_breakpoints_out ();
1113 /* The target reports the exec event to the main thread, even if
1114 some other thread does the exec, and even if the main thread was
1115 stopped or already gone. We may still have non-leader threads of
1116 the process on our list. E.g., on targets that don't have thread
1117 exit events (like remote); or on native Linux in non-stop mode if
1118 there were only two threads in the inferior and the non-leader
1119 one is the one that execs (and nothing forces an update of the
1120 thread list up to here). When debugging remotely, it's best to
1121 avoid extra traffic, when possible, so avoid syncing the thread
1122 list with the target, and instead go ahead and delete all threads
1123 of the process but one that reported the event. Note this must
1124 be done before calling update_breakpoints_after_exec, as
1125 otherwise clearing the threads' resources would reference stale
1126 thread breakpoints -- it may have been one of these threads that
1127 stepped across the exec. We could just clear their stepping
1128 states, but as long as we're iterating, might as well delete
1129 them. Deleting them now rather than at the next user-visible
1130 stop provides a nicer sequence of events for user and MI
1132 ALL_THREADS_SAFE (th
, tmp
)
1133 if (ptid_get_pid (th
->ptid
) == pid
&& !ptid_equal (th
->ptid
, ptid
))
1134 delete_thread (th
->ptid
);
1136 /* We also need to clear any left over stale state for the
1137 leader/event thread. E.g., if there was any step-resume
1138 breakpoint or similar, it's gone now. We cannot truly
1139 step-to-next statement through an exec(). */
1140 th
= inferior_thread ();
1141 th
->control
.step_resume_breakpoint
= NULL
;
1142 th
->control
.exception_resume_breakpoint
= NULL
;
1143 th
->control
.single_step_breakpoints
= NULL
;
1144 th
->control
.step_range_start
= 0;
1145 th
->control
.step_range_end
= 0;
1147 /* The user may have had the main thread held stopped in the
1148 previous image (e.g., schedlock on, or non-stop). Release
1150 th
->stop_requested
= 0;
1152 update_breakpoints_after_exec ();
1154 /* What is this a.out's name? */
1155 printf_unfiltered (_("%s is executing new program: %s\n"),
1156 target_pid_to_str (inferior_ptid
),
1159 /* We've followed the inferior through an exec. Therefore, the
1160 inferior has essentially been killed & reborn. */
1162 gdb_flush (gdb_stdout
);
1164 breakpoint_init_inferior (inf_execd
);
1166 if (*gdb_sysroot
!= '\0')
1168 char *name
= exec_file_find (execd_pathname
, NULL
);
1170 execd_pathname
= alloca (strlen (name
) + 1);
1171 strcpy (execd_pathname
, name
);
1175 /* Reset the shared library package. This ensures that we get a
1176 shlib event when the child reaches "_start", at which point the
1177 dld will have had a chance to initialize the child. */
1178 /* Also, loading a symbol file below may trigger symbol lookups, and
1179 we don't want those to be satisfied by the libraries of the
1180 previous incarnation of this process. */
1181 no_shared_libraries (NULL
, 0);
1183 if (follow_exec_mode_string
== follow_exec_mode_new
)
1185 struct program_space
*pspace
;
1187 /* The user wants to keep the old inferior and program spaces
1188 around. Create a new fresh one, and switch to it. */
1190 /* Do exit processing for the original inferior before adding
1191 the new inferior so we don't have two active inferiors with
1192 the same ptid, which can confuse find_inferior_ptid. */
1193 exit_inferior_num_silent (current_inferior ()->num
);
1195 inf
= add_inferior (pid
);
1196 pspace
= add_program_space (maybe_new_address_space ());
1197 inf
->pspace
= pspace
;
1198 inf
->aspace
= pspace
->aspace
;
1201 set_current_inferior (inf
);
1202 set_current_program_space (pspace
);
1206 /* The old description may no longer be fit for the new image.
1207 E.g, a 64-bit process exec'ed a 32-bit process. Clear the
1208 old description; we'll read a new one below. No need to do
1209 this on "follow-exec-mode new", as the old inferior stays
1210 around (its description is later cleared/refetched on
1212 target_clear_description ();
1215 gdb_assert (current_program_space
== inf
->pspace
);
1217 /* That a.out is now the one to use. */
1218 exec_file_attach (execd_pathname
, 0);
1220 /* SYMFILE_DEFER_BP_RESET is used as the proper displacement for PIE
1221 (Position Independent Executable) main symbol file will get applied by
1222 solib_create_inferior_hook below. breakpoint_re_set would fail to insert
1223 the breakpoints with the zero displacement. */
1225 symbol_file_add (execd_pathname
,
1227 | SYMFILE_MAINLINE
| SYMFILE_DEFER_BP_RESET
),
1230 if ((inf
->symfile_flags
& SYMFILE_NO_READ
) == 0)
1231 set_initial_language ();
1233 /* If the target can specify a description, read it. Must do this
1234 after flipping to the new executable (because the target supplied
1235 description must be compatible with the executable's
1236 architecture, and the old executable may e.g., be 32-bit, while
1237 the new one 64-bit), and before anything involving memory or
1239 target_find_description ();
1241 solib_create_inferior_hook (0);
1243 jit_inferior_created_hook ();
1245 breakpoint_re_set ();
1247 /* Reinsert all breakpoints. (Those which were symbolic have
1248 been reset to the proper address in the new a.out, thanks
1249 to symbol_file_command...). */
1250 insert_breakpoints ();
1252 /* The next resume of this inferior should bring it to the shlib
1253 startup breakpoints. (If the user had also set bp's on
1254 "main" from the old (parent) process, then they'll auto-
1255 matically get reset there in the new process.). */
1258 /* The queue of threads that need to do a step-over operation to get
1259 past e.g., a breakpoint. What technique is used to step over the
1260 breakpoint/watchpoint does not matter -- all threads end up in the
1261 same queue, to maintain rough temporal order of execution, in order
1262 to avoid starvation, otherwise, we could e.g., find ourselves
1263 constantly stepping the same couple threads past their breakpoints
1264 over and over, if the single-step finish fast enough. */
1265 struct thread_info
*step_over_queue_head
;
1267 /* Bit flags indicating what the thread needs to step over. */
1271 /* Step over a breakpoint. */
1272 STEP_OVER_BREAKPOINT
= 1,
1274 /* Step past a non-continuable watchpoint, in order to let the
1275 instruction execute so we can evaluate the watchpoint
1277 STEP_OVER_WATCHPOINT
= 2
1280 /* Info about an instruction that is being stepped over. */
1282 struct step_over_info
1284 /* If we're stepping past a breakpoint, this is the address space
1285 and address of the instruction the breakpoint is set at. We'll
1286 skip inserting all breakpoints here. Valid iff ASPACE is
1288 struct address_space
*aspace
;
1291 /* The instruction being stepped over triggers a nonsteppable
1292 watchpoint. If true, we'll skip inserting watchpoints. */
1293 int nonsteppable_watchpoint_p
;
1296 /* The step-over info of the location that is being stepped over.
1298 Note that with async/breakpoint always-inserted mode, a user might
1299 set a new breakpoint/watchpoint/etc. exactly while a breakpoint is
1300 being stepped over. As setting a new breakpoint inserts all
1301 breakpoints, we need to make sure the breakpoint being stepped over
1302 isn't inserted then. We do that by only clearing the step-over
1303 info when the step-over is actually finished (or aborted).
1305 Presently GDB can only step over one breakpoint at any given time.
1306 Given threads that can't run code in the same address space as the
1307 breakpoint's can't really miss the breakpoint, GDB could be taught
1308 to step-over at most one breakpoint per address space (so this info
1309 could move to the address space object if/when GDB is extended).
1310 The set of breakpoints being stepped over will normally be much
1311 smaller than the set of all breakpoints, so a flag in the
1312 breakpoint location structure would be wasteful. A separate list
1313 also saves complexity and run-time, as otherwise we'd have to go
1314 through all breakpoint locations clearing their flag whenever we
1315 start a new sequence. Similar considerations weigh against storing
1316 this info in the thread object. Plus, not all step overs actually
1317 have breakpoint locations -- e.g., stepping past a single-step
1318 breakpoint, or stepping to complete a non-continuable
1320 static struct step_over_info step_over_info
;
1322 /* Record the address of the breakpoint/instruction we're currently
1326 set_step_over_info (struct address_space
*aspace
, CORE_ADDR address
,
1327 int nonsteppable_watchpoint_p
)
1329 step_over_info
.aspace
= aspace
;
1330 step_over_info
.address
= address
;
1331 step_over_info
.nonsteppable_watchpoint_p
= nonsteppable_watchpoint_p
;
1334 /* Called when we're not longer stepping over a breakpoint / an
1335 instruction, so all breakpoints are free to be (re)inserted. */
1338 clear_step_over_info (void)
1341 fprintf_unfiltered (gdb_stdlog
,
1342 "infrun: clear_step_over_info\n");
1343 step_over_info
.aspace
= NULL
;
1344 step_over_info
.address
= 0;
1345 step_over_info
.nonsteppable_watchpoint_p
= 0;
1351 stepping_past_instruction_at (struct address_space
*aspace
,
1354 return (step_over_info
.aspace
!= NULL
1355 && breakpoint_address_match (aspace
, address
,
1356 step_over_info
.aspace
,
1357 step_over_info
.address
));
1363 stepping_past_nonsteppable_watchpoint (void)
1365 return step_over_info
.nonsteppable_watchpoint_p
;
1368 /* Returns true if step-over info is valid. */
1371 step_over_info_valid_p (void)
1373 return (step_over_info
.aspace
!= NULL
1374 || stepping_past_nonsteppable_watchpoint ());
1378 /* Displaced stepping. */
1380 /* In non-stop debugging mode, we must take special care to manage
1381 breakpoints properly; in particular, the traditional strategy for
1382 stepping a thread past a breakpoint it has hit is unsuitable.
1383 'Displaced stepping' is a tactic for stepping one thread past a
1384 breakpoint it has hit while ensuring that other threads running
1385 concurrently will hit the breakpoint as they should.
1387 The traditional way to step a thread T off a breakpoint in a
1388 multi-threaded program in all-stop mode is as follows:
1390 a0) Initially, all threads are stopped, and breakpoints are not
1392 a1) We single-step T, leaving breakpoints uninserted.
1393 a2) We insert breakpoints, and resume all threads.
1395 In non-stop debugging, however, this strategy is unsuitable: we
1396 don't want to have to stop all threads in the system in order to
1397 continue or step T past a breakpoint. Instead, we use displaced
1400 n0) Initially, T is stopped, other threads are running, and
1401 breakpoints are inserted.
1402 n1) We copy the instruction "under" the breakpoint to a separate
1403 location, outside the main code stream, making any adjustments
1404 to the instruction, register, and memory state as directed by
1406 n2) We single-step T over the instruction at its new location.
1407 n3) We adjust the resulting register and memory state as directed
1408 by T's architecture. This includes resetting T's PC to point
1409 back into the main instruction stream.
1412 This approach depends on the following gdbarch methods:
1414 - gdbarch_max_insn_length and gdbarch_displaced_step_location
1415 indicate where to copy the instruction, and how much space must
1416 be reserved there. We use these in step n1.
1418 - gdbarch_displaced_step_copy_insn copies a instruction to a new
1419 address, and makes any necessary adjustments to the instruction,
1420 register contents, and memory. We use this in step n1.
1422 - gdbarch_displaced_step_fixup adjusts registers and memory after
1423 we have successfuly single-stepped the instruction, to yield the
1424 same effect the instruction would have had if we had executed it
1425 at its original address. We use this in step n3.
1427 - gdbarch_displaced_step_free_closure provides cleanup.
1429 The gdbarch_displaced_step_copy_insn and
1430 gdbarch_displaced_step_fixup functions must be written so that
1431 copying an instruction with gdbarch_displaced_step_copy_insn,
1432 single-stepping across the copied instruction, and then applying
1433 gdbarch_displaced_insn_fixup should have the same effects on the
1434 thread's memory and registers as stepping the instruction in place
1435 would have. Exactly which responsibilities fall to the copy and
1436 which fall to the fixup is up to the author of those functions.
1438 See the comments in gdbarch.sh for details.
1440 Note that displaced stepping and software single-step cannot
1441 currently be used in combination, although with some care I think
1442 they could be made to. Software single-step works by placing
1443 breakpoints on all possible subsequent instructions; if the
1444 displaced instruction is a PC-relative jump, those breakpoints
1445 could fall in very strange places --- on pages that aren't
1446 executable, or at addresses that are not proper instruction
1447 boundaries. (We do generally let other threads run while we wait
1448 to hit the software single-step breakpoint, and they might
1449 encounter such a corrupted instruction.) One way to work around
1450 this would be to have gdbarch_displaced_step_copy_insn fully
1451 simulate the effect of PC-relative instructions (and return NULL)
1452 on architectures that use software single-stepping.
1454 In non-stop mode, we can have independent and simultaneous step
1455 requests, so more than one thread may need to simultaneously step
1456 over a breakpoint. The current implementation assumes there is
1457 only one scratch space per process. In this case, we have to
1458 serialize access to the scratch space. If thread A wants to step
1459 over a breakpoint, but we are currently waiting for some other
1460 thread to complete a displaced step, we leave thread A stopped and
1461 place it in the displaced_step_request_queue. Whenever a displaced
1462 step finishes, we pick the next thread in the queue and start a new
1463 displaced step operation on it. See displaced_step_prepare and
1464 displaced_step_fixup for details. */
1466 /* Per-inferior displaced stepping state. */
1467 struct displaced_step_inferior_state
1469 /* Pointer to next in linked list. */
1470 struct displaced_step_inferior_state
*next
;
1472 /* The process this displaced step state refers to. */
1475 /* True if preparing a displaced step ever failed. If so, we won't
1476 try displaced stepping for this inferior again. */
1479 /* If this is not null_ptid, this is the thread carrying out a
1480 displaced single-step in process PID. This thread's state will
1481 require fixing up once it has completed its step. */
1484 /* The architecture the thread had when we stepped it. */
1485 struct gdbarch
*step_gdbarch
;
1487 /* The closure provided gdbarch_displaced_step_copy_insn, to be used
1488 for post-step cleanup. */
1489 struct displaced_step_closure
*step_closure
;
1491 /* The address of the original instruction, and the copy we
1493 CORE_ADDR step_original
, step_copy
;
1495 /* Saved contents of copy area. */
1496 gdb_byte
*step_saved_copy
;
1499 /* The list of states of processes involved in displaced stepping
1501 static struct displaced_step_inferior_state
*displaced_step_inferior_states
;
1503 /* Get the displaced stepping state of process PID. */
1505 static struct displaced_step_inferior_state
*
1506 get_displaced_stepping_state (int pid
)
1508 struct displaced_step_inferior_state
*state
;
1510 for (state
= displaced_step_inferior_states
;
1512 state
= state
->next
)
1513 if (state
->pid
== pid
)
1519 /* Returns true if any inferior has a thread doing a displaced
1523 displaced_step_in_progress_any_inferior (void)
1525 struct displaced_step_inferior_state
*state
;
1527 for (state
= displaced_step_inferior_states
;
1529 state
= state
->next
)
1530 if (!ptid_equal (state
->step_ptid
, null_ptid
))
1536 /* Return true if process PID has a thread doing a displaced step. */
1539 displaced_step_in_progress (int pid
)
1541 struct displaced_step_inferior_state
*displaced
;
1543 displaced
= get_displaced_stepping_state (pid
);
1544 if (displaced
!= NULL
&& !ptid_equal (displaced
->step_ptid
, null_ptid
))
1550 /* Add a new displaced stepping state for process PID to the displaced
1551 stepping state list, or return a pointer to an already existing
1552 entry, if it already exists. Never returns NULL. */
1554 static struct displaced_step_inferior_state
*
1555 add_displaced_stepping_state (int pid
)
1557 struct displaced_step_inferior_state
*state
;
1559 for (state
= displaced_step_inferior_states
;
1561 state
= state
->next
)
1562 if (state
->pid
== pid
)
1565 state
= xcalloc (1, sizeof (*state
));
1567 state
->next
= displaced_step_inferior_states
;
1568 displaced_step_inferior_states
= state
;
1573 /* If inferior is in displaced stepping, and ADDR equals to starting address
1574 of copy area, return corresponding displaced_step_closure. Otherwise,
1577 struct displaced_step_closure
*
1578 get_displaced_step_closure_by_addr (CORE_ADDR addr
)
1580 struct displaced_step_inferior_state
*displaced
1581 = get_displaced_stepping_state (ptid_get_pid (inferior_ptid
));
1583 /* If checking the mode of displaced instruction in copy area. */
1584 if (displaced
&& !ptid_equal (displaced
->step_ptid
, null_ptid
)
1585 && (displaced
->step_copy
== addr
))
1586 return displaced
->step_closure
;
1591 /* Remove the displaced stepping state of process PID. */
1594 remove_displaced_stepping_state (int pid
)
1596 struct displaced_step_inferior_state
*it
, **prev_next_p
;
1598 gdb_assert (pid
!= 0);
1600 it
= displaced_step_inferior_states
;
1601 prev_next_p
= &displaced_step_inferior_states
;
1606 *prev_next_p
= it
->next
;
1611 prev_next_p
= &it
->next
;
1617 infrun_inferior_exit (struct inferior
*inf
)
1619 remove_displaced_stepping_state (inf
->pid
);
1622 /* If ON, and the architecture supports it, GDB will use displaced
1623 stepping to step over breakpoints. If OFF, or if the architecture
1624 doesn't support it, GDB will instead use the traditional
1625 hold-and-step approach. If AUTO (which is the default), GDB will
1626 decide which technique to use to step over breakpoints depending on
1627 which of all-stop or non-stop mode is active --- displaced stepping
1628 in non-stop mode; hold-and-step in all-stop mode. */
1630 static enum auto_boolean can_use_displaced_stepping
= AUTO_BOOLEAN_AUTO
;
1633 show_can_use_displaced_stepping (struct ui_file
*file
, int from_tty
,
1634 struct cmd_list_element
*c
,
1637 if (can_use_displaced_stepping
== AUTO_BOOLEAN_AUTO
)
1638 fprintf_filtered (file
,
1639 _("Debugger's willingness to use displaced stepping "
1640 "to step over breakpoints is %s (currently %s).\n"),
1641 value
, target_is_non_stop_p () ? "on" : "off");
1643 fprintf_filtered (file
,
1644 _("Debugger's willingness to use displaced stepping "
1645 "to step over breakpoints is %s.\n"), value
);
1648 /* Return non-zero if displaced stepping can/should be used to step
1649 over breakpoints of thread TP. */
1652 use_displaced_stepping (struct thread_info
*tp
)
1654 struct regcache
*regcache
= get_thread_regcache (tp
->ptid
);
1655 struct gdbarch
*gdbarch
= get_regcache_arch (regcache
);
1656 struct displaced_step_inferior_state
*displaced_state
;
1658 displaced_state
= get_displaced_stepping_state (ptid_get_pid (tp
->ptid
));
1660 return (((can_use_displaced_stepping
== AUTO_BOOLEAN_AUTO
1661 && target_is_non_stop_p ())
1662 || can_use_displaced_stepping
== AUTO_BOOLEAN_TRUE
)
1663 && gdbarch_displaced_step_copy_insn_p (gdbarch
)
1664 && find_record_target () == NULL
1665 && (displaced_state
== NULL
1666 || !displaced_state
->failed_before
));
1669 /* Clean out any stray displaced stepping state. */
1671 displaced_step_clear (struct displaced_step_inferior_state
*displaced
)
1673 /* Indicate that there is no cleanup pending. */
1674 displaced
->step_ptid
= null_ptid
;
1676 if (displaced
->step_closure
)
1678 gdbarch_displaced_step_free_closure (displaced
->step_gdbarch
,
1679 displaced
->step_closure
);
1680 displaced
->step_closure
= NULL
;
1685 displaced_step_clear_cleanup (void *arg
)
1687 struct displaced_step_inferior_state
*state
= arg
;
1689 displaced_step_clear (state
);
1692 /* Dump LEN bytes at BUF in hex to FILE, followed by a newline. */
1694 displaced_step_dump_bytes (struct ui_file
*file
,
1695 const gdb_byte
*buf
,
1700 for (i
= 0; i
< len
; i
++)
1701 fprintf_unfiltered (file
, "%02x ", buf
[i
]);
1702 fputs_unfiltered ("\n", file
);
1705 /* Prepare to single-step, using displaced stepping.
1707 Note that we cannot use displaced stepping when we have a signal to
1708 deliver. If we have a signal to deliver and an instruction to step
1709 over, then after the step, there will be no indication from the
1710 target whether the thread entered a signal handler or ignored the
1711 signal and stepped over the instruction successfully --- both cases
1712 result in a simple SIGTRAP. In the first case we mustn't do a
1713 fixup, and in the second case we must --- but we can't tell which.
1714 Comments in the code for 'random signals' in handle_inferior_event
1715 explain how we handle this case instead.
1717 Returns 1 if preparing was successful -- this thread is going to be
1718 stepped now; 0 if displaced stepping this thread got queued; or -1
1719 if this instruction can't be displaced stepped. */
1722 displaced_step_prepare_throw (ptid_t ptid
)
1724 struct cleanup
*old_cleanups
, *ignore_cleanups
;
1725 struct thread_info
*tp
= find_thread_ptid (ptid
);
1726 struct regcache
*regcache
= get_thread_regcache (ptid
);
1727 struct gdbarch
*gdbarch
= get_regcache_arch (regcache
);
1728 CORE_ADDR original
, copy
;
1730 struct displaced_step_closure
*closure
;
1731 struct displaced_step_inferior_state
*displaced
;
1734 /* We should never reach this function if the architecture does not
1735 support displaced stepping. */
1736 gdb_assert (gdbarch_displaced_step_copy_insn_p (gdbarch
));
1738 /* Nor if the thread isn't meant to step over a breakpoint. */
1739 gdb_assert (tp
->control
.trap_expected
);
1741 /* Disable range stepping while executing in the scratch pad. We
1742 want a single-step even if executing the displaced instruction in
1743 the scratch buffer lands within the stepping range (e.g., a
1745 tp
->control
.may_range_step
= 0;
1747 /* We have to displaced step one thread at a time, as we only have
1748 access to a single scratch space per inferior. */
1750 displaced
= add_displaced_stepping_state (ptid_get_pid (ptid
));
1752 if (!ptid_equal (displaced
->step_ptid
, null_ptid
))
1754 /* Already waiting for a displaced step to finish. Defer this
1755 request and place in queue. */
1757 if (debug_displaced
)
1758 fprintf_unfiltered (gdb_stdlog
,
1759 "displaced: deferring step of %s\n",
1760 target_pid_to_str (ptid
));
1762 thread_step_over_chain_enqueue (tp
);
1767 if (debug_displaced
)
1768 fprintf_unfiltered (gdb_stdlog
,
1769 "displaced: stepping %s now\n",
1770 target_pid_to_str (ptid
));
1773 displaced_step_clear (displaced
);
1775 old_cleanups
= save_inferior_ptid ();
1776 inferior_ptid
= ptid
;
1778 original
= regcache_read_pc (regcache
);
1780 copy
= gdbarch_displaced_step_location (gdbarch
);
1781 len
= gdbarch_max_insn_length (gdbarch
);
1783 /* Save the original contents of the copy area. */
1784 displaced
->step_saved_copy
= xmalloc (len
);
1785 ignore_cleanups
= make_cleanup (free_current_contents
,
1786 &displaced
->step_saved_copy
);
1787 status
= target_read_memory (copy
, displaced
->step_saved_copy
, len
);
1789 throw_error (MEMORY_ERROR
,
1790 _("Error accessing memory address %s (%s) for "
1791 "displaced-stepping scratch space."),
1792 paddress (gdbarch
, copy
), safe_strerror (status
));
1793 if (debug_displaced
)
1795 fprintf_unfiltered (gdb_stdlog
, "displaced: saved %s: ",
1796 paddress (gdbarch
, copy
));
1797 displaced_step_dump_bytes (gdb_stdlog
,
1798 displaced
->step_saved_copy
,
1802 closure
= gdbarch_displaced_step_copy_insn (gdbarch
,
1803 original
, copy
, regcache
);
1804 if (closure
== NULL
)
1806 /* The architecture doesn't know how or want to displaced step
1807 this instruction or instruction sequence. Fallback to
1808 stepping over the breakpoint in-line. */
1809 do_cleanups (old_cleanups
);
1813 /* Save the information we need to fix things up if the step
1815 displaced
->step_ptid
= ptid
;
1816 displaced
->step_gdbarch
= gdbarch
;
1817 displaced
->step_closure
= closure
;
1818 displaced
->step_original
= original
;
1819 displaced
->step_copy
= copy
;
1821 make_cleanup (displaced_step_clear_cleanup
, displaced
);
1823 /* Resume execution at the copy. */
1824 regcache_write_pc (regcache
, copy
);
1826 discard_cleanups (ignore_cleanups
);
1828 do_cleanups (old_cleanups
);
1830 if (debug_displaced
)
1831 fprintf_unfiltered (gdb_stdlog
, "displaced: displaced pc to %s\n",
1832 paddress (gdbarch
, copy
));
1837 /* Wrapper for displaced_step_prepare_throw that disabled further
1838 attempts at displaced stepping if we get a memory error. */
1841 displaced_step_prepare (ptid_t ptid
)
1847 prepared
= displaced_step_prepare_throw (ptid
);
1849 CATCH (ex
, RETURN_MASK_ERROR
)
1851 struct displaced_step_inferior_state
*displaced_state
;
1853 if (ex
.error
!= MEMORY_ERROR
)
1854 throw_exception (ex
);
1858 fprintf_unfiltered (gdb_stdlog
,
1859 "infrun: disabling displaced stepping: %s\n",
1863 /* Be verbose if "set displaced-stepping" is "on", silent if
1865 if (can_use_displaced_stepping
== AUTO_BOOLEAN_TRUE
)
1867 warning (_("disabling displaced stepping: %s"),
1871 /* Disable further displaced stepping attempts. */
1873 = get_displaced_stepping_state (ptid_get_pid (ptid
));
1874 displaced_state
->failed_before
= 1;
1882 write_memory_ptid (ptid_t ptid
, CORE_ADDR memaddr
,
1883 const gdb_byte
*myaddr
, int len
)
1885 struct cleanup
*ptid_cleanup
= save_inferior_ptid ();
1887 inferior_ptid
= ptid
;
1888 write_memory (memaddr
, myaddr
, len
);
1889 do_cleanups (ptid_cleanup
);
1892 /* Restore the contents of the copy area for thread PTID. */
1895 displaced_step_restore (struct displaced_step_inferior_state
*displaced
,
1898 ULONGEST len
= gdbarch_max_insn_length (displaced
->step_gdbarch
);
1900 write_memory_ptid (ptid
, displaced
->step_copy
,
1901 displaced
->step_saved_copy
, len
);
1902 if (debug_displaced
)
1903 fprintf_unfiltered (gdb_stdlog
, "displaced: restored %s %s\n",
1904 target_pid_to_str (ptid
),
1905 paddress (displaced
->step_gdbarch
,
1906 displaced
->step_copy
));
1909 /* If we displaced stepped an instruction successfully, adjust
1910 registers and memory to yield the same effect the instruction would
1911 have had if we had executed it at its original address, and return
1912 1. If the instruction didn't complete, relocate the PC and return
1913 -1. If the thread wasn't displaced stepping, return 0. */
1916 displaced_step_fixup (ptid_t event_ptid
, enum gdb_signal signal
)
1918 struct cleanup
*old_cleanups
;
1919 struct displaced_step_inferior_state
*displaced
1920 = get_displaced_stepping_state (ptid_get_pid (event_ptid
));
1923 /* Was any thread of this process doing a displaced step? */
1924 if (displaced
== NULL
)
1927 /* Was this event for the pid we displaced? */
1928 if (ptid_equal (displaced
->step_ptid
, null_ptid
)
1929 || ! ptid_equal (displaced
->step_ptid
, event_ptid
))
1932 old_cleanups
= make_cleanup (displaced_step_clear_cleanup
, displaced
);
1934 displaced_step_restore (displaced
, displaced
->step_ptid
);
1936 /* Fixup may need to read memory/registers. Switch to the thread
1937 that we're fixing up. Also, target_stopped_by_watchpoint checks
1938 the current thread. */
1939 switch_to_thread (event_ptid
);
1941 /* Did the instruction complete successfully? */
1942 if (signal
== GDB_SIGNAL_TRAP
1943 && !(target_stopped_by_watchpoint ()
1944 && (gdbarch_have_nonsteppable_watchpoint (displaced
->step_gdbarch
)
1945 || target_have_steppable_watchpoint
)))
1947 /* Fix up the resulting state. */
1948 gdbarch_displaced_step_fixup (displaced
->step_gdbarch
,
1949 displaced
->step_closure
,
1950 displaced
->step_original
,
1951 displaced
->step_copy
,
1952 get_thread_regcache (displaced
->step_ptid
));
1957 /* Since the instruction didn't complete, all we can do is
1959 struct regcache
*regcache
= get_thread_regcache (event_ptid
);
1960 CORE_ADDR pc
= regcache_read_pc (regcache
);
1962 pc
= displaced
->step_original
+ (pc
- displaced
->step_copy
);
1963 regcache_write_pc (regcache
, pc
);
1967 do_cleanups (old_cleanups
);
1969 displaced
->step_ptid
= null_ptid
;
1974 /* Data to be passed around while handling an event. This data is
1975 discarded between events. */
1976 struct execution_control_state
1979 /* The thread that got the event, if this was a thread event; NULL
1981 struct thread_info
*event_thread
;
1983 struct target_waitstatus ws
;
1984 int stop_func_filled_in
;
1985 CORE_ADDR stop_func_start
;
1986 CORE_ADDR stop_func_end
;
1987 const char *stop_func_name
;
1990 /* True if the event thread hit the single-step breakpoint of
1991 another thread. Thus the event doesn't cause a stop, the thread
1992 needs to be single-stepped past the single-step breakpoint before
1993 we can switch back to the original stepping thread. */
1994 int hit_singlestep_breakpoint
;
1997 /* Clear ECS and set it to point at TP. */
2000 reset_ecs (struct execution_control_state
*ecs
, struct thread_info
*tp
)
2002 memset (ecs
, 0, sizeof (*ecs
));
2003 ecs
->event_thread
= tp
;
2004 ecs
->ptid
= tp
->ptid
;
2007 static void keep_going_pass_signal (struct execution_control_state
*ecs
);
2008 static void prepare_to_wait (struct execution_control_state
*ecs
);
2009 static int keep_going_stepped_thread (struct thread_info
*tp
);
2010 static int thread_still_needs_step_over (struct thread_info
*tp
);
2011 static void stop_all_threads (void);
2013 /* Are there any pending step-over requests? If so, run all we can
2014 now and return true. Otherwise, return false. */
2017 start_step_over (void)
2019 struct thread_info
*tp
, *next
;
2021 /* Don't start a new step-over if we already have an in-line
2022 step-over operation ongoing. */
2023 if (step_over_info_valid_p ())
2026 for (tp
= step_over_queue_head
; tp
!= NULL
; tp
= next
)
2028 struct execution_control_state ecss
;
2029 struct execution_control_state
*ecs
= &ecss
;
2030 enum step_over_what step_what
;
2031 int must_be_in_line
;
2033 next
= thread_step_over_chain_next (tp
);
2035 /* If this inferior already has a displaced step in process,
2036 don't start a new one. */
2037 if (displaced_step_in_progress (ptid_get_pid (tp
->ptid
)))
2040 step_what
= thread_still_needs_step_over (tp
);
2041 must_be_in_line
= ((step_what
& STEP_OVER_WATCHPOINT
)
2042 || ((step_what
& STEP_OVER_BREAKPOINT
)
2043 && !use_displaced_stepping (tp
)));
2045 /* We currently stop all threads of all processes to step-over
2046 in-line. If we need to start a new in-line step-over, let
2047 any pending displaced steps finish first. */
2048 if (must_be_in_line
&& displaced_step_in_progress_any_inferior ())
2051 thread_step_over_chain_remove (tp
);
2053 if (step_over_queue_head
== NULL
)
2056 fprintf_unfiltered (gdb_stdlog
,
2057 "infrun: step-over queue now empty\n");
2060 if (tp
->control
.trap_expected
2064 internal_error (__FILE__
, __LINE__
,
2065 "[%s] has inconsistent state: "
2066 "trap_expected=%d, resumed=%d, executing=%d\n",
2067 target_pid_to_str (tp
->ptid
),
2068 tp
->control
.trap_expected
,
2074 fprintf_unfiltered (gdb_stdlog
,
2075 "infrun: resuming [%s] for step-over\n",
2076 target_pid_to_str (tp
->ptid
));
2078 /* keep_going_pass_signal skips the step-over if the breakpoint
2079 is no longer inserted. In all-stop, we want to keep looking
2080 for a thread that needs a step-over instead of resuming TP,
2081 because we wouldn't be able to resume anything else until the
2082 target stops again. In non-stop, the resume always resumes
2083 only TP, so it's OK to let the thread resume freely. */
2084 if (!target_is_non_stop_p () && !step_what
)
2087 switch_to_thread (tp
->ptid
);
2088 reset_ecs (ecs
, tp
);
2089 keep_going_pass_signal (ecs
);
2091 if (!ecs
->wait_some_more
)
2092 error (_("Command aborted."));
2094 gdb_assert (tp
->resumed
);
2096 /* If we started a new in-line step-over, we're done. */
2097 if (step_over_info_valid_p ())
2099 gdb_assert (tp
->control
.trap_expected
);
2103 if (!target_is_non_stop_p ())
2105 /* On all-stop, shouldn't have resumed unless we needed a
2107 gdb_assert (tp
->control
.trap_expected
2108 || tp
->step_after_step_resume_breakpoint
);
2110 /* With remote targets (at least), in all-stop, we can't
2111 issue any further remote commands until the program stops
2116 /* Either the thread no longer needed a step-over, or a new
2117 displaced stepping sequence started. Even in the latter
2118 case, continue looking. Maybe we can also start another
2119 displaced step on a thread of other process. */
2125 /* Update global variables holding ptids to hold NEW_PTID if they were
2126 holding OLD_PTID. */
2128 infrun_thread_ptid_changed (ptid_t old_ptid
, ptid_t new_ptid
)
2130 struct displaced_step_request
*it
;
2131 struct displaced_step_inferior_state
*displaced
;
2133 if (ptid_equal (inferior_ptid
, old_ptid
))
2134 inferior_ptid
= new_ptid
;
2136 for (displaced
= displaced_step_inferior_states
;
2138 displaced
= displaced
->next
)
2140 if (ptid_equal (displaced
->step_ptid
, old_ptid
))
2141 displaced
->step_ptid
= new_ptid
;
2148 /* Things to clean up if we QUIT out of resume (). */
2150 resume_cleanups (void *ignore
)
2152 if (!ptid_equal (inferior_ptid
, null_ptid
))
2153 delete_single_step_breakpoints (inferior_thread ());
2158 static const char schedlock_off
[] = "off";
2159 static const char schedlock_on
[] = "on";
2160 static const char schedlock_step
[] = "step";
2161 static const char *const scheduler_enums
[] = {
2167 static const char *scheduler_mode
= schedlock_off
;
2169 show_scheduler_mode (struct ui_file
*file
, int from_tty
,
2170 struct cmd_list_element
*c
, const char *value
)
2172 fprintf_filtered (file
,
2173 _("Mode for locking scheduler "
2174 "during execution is \"%s\".\n"),
2179 set_schedlock_func (char *args
, int from_tty
, struct cmd_list_element
*c
)
2181 if (!target_can_lock_scheduler
)
2183 scheduler_mode
= schedlock_off
;
2184 error (_("Target '%s' cannot support this command."), target_shortname
);
2188 /* True if execution commands resume all threads of all processes by
2189 default; otherwise, resume only threads of the current inferior
2191 int sched_multi
= 0;
2193 /* Try to setup for software single stepping over the specified location.
2194 Return 1 if target_resume() should use hardware single step.
2196 GDBARCH the current gdbarch.
2197 PC the location to step over. */
2200 maybe_software_singlestep (struct gdbarch
*gdbarch
, CORE_ADDR pc
)
2204 if (execution_direction
== EXEC_FORWARD
2205 && gdbarch_software_single_step_p (gdbarch
)
2206 && gdbarch_software_single_step (gdbarch
, get_current_frame ()))
2216 user_visible_resume_ptid (int step
)
2222 /* With non-stop mode on, threads are always handled
2224 resume_ptid
= inferior_ptid
;
2226 else if ((scheduler_mode
== schedlock_on
)
2227 || (scheduler_mode
== schedlock_step
&& step
))
2229 /* User-settable 'scheduler' mode requires solo thread
2231 resume_ptid
= inferior_ptid
;
2233 else if (!sched_multi
&& target_supports_multi_process ())
2235 /* Resume all threads of the current process (and none of other
2237 resume_ptid
= pid_to_ptid (ptid_get_pid (inferior_ptid
));
2241 /* Resume all threads of all processes. */
2242 resume_ptid
= RESUME_ALL
;
2248 /* Return a ptid representing the set of threads that we will resume,
2249 in the perspective of the target, assuming run control handling
2250 does not require leaving some threads stopped (e.g., stepping past
2251 breakpoint). USER_STEP indicates whether we're about to start the
2252 target for a stepping command. */
2255 internal_resume_ptid (int user_step
)
2257 /* In non-stop, we always control threads individually. Note that
2258 the target may always work in non-stop mode even with "set
2259 non-stop off", in which case user_visible_resume_ptid could
2260 return a wildcard ptid. */
2261 if (target_is_non_stop_p ())
2262 return inferior_ptid
;
2264 return user_visible_resume_ptid (user_step
);
2267 /* Wrapper for target_resume, that handles infrun-specific
2271 do_target_resume (ptid_t resume_ptid
, int step
, enum gdb_signal sig
)
2273 struct thread_info
*tp
= inferior_thread ();
2275 /* Install inferior's terminal modes. */
2276 target_terminal_inferior ();
2278 /* Avoid confusing the next resume, if the next stop/resume
2279 happens to apply to another thread. */
2280 tp
->suspend
.stop_signal
= GDB_SIGNAL_0
;
2282 /* Advise target which signals may be handled silently.
2284 If we have removed breakpoints because we are stepping over one
2285 in-line (in any thread), we need to receive all signals to avoid
2286 accidentally skipping a breakpoint during execution of a signal
2289 Likewise if we're displaced stepping, otherwise a trap for a
2290 breakpoint in a signal handler might be confused with the
2291 displaced step finishing. We don't make the displaced_step_fixup
2292 step distinguish the cases instead, because:
2294 - a backtrace while stopped in the signal handler would show the
2295 scratch pad as frame older than the signal handler, instead of
2296 the real mainline code.
2298 - when the thread is later resumed, the signal handler would
2299 return to the scratch pad area, which would no longer be
2301 if (step_over_info_valid_p ()
2302 || displaced_step_in_progress (ptid_get_pid (tp
->ptid
)))
2303 target_pass_signals (0, NULL
);
2305 target_pass_signals ((int) GDB_SIGNAL_LAST
, signal_pass
);
2307 target_resume (resume_ptid
, step
, sig
);
2310 /* Resume the inferior, but allow a QUIT. This is useful if the user
2311 wants to interrupt some lengthy single-stepping operation
2312 (for child processes, the SIGINT goes to the inferior, and so
2313 we get a SIGINT random_signal, but for remote debugging and perhaps
2314 other targets, that's not true).
2316 SIG is the signal to give the inferior (zero for none). */
2318 resume (enum gdb_signal sig
)
2320 struct cleanup
*old_cleanups
= make_cleanup (resume_cleanups
, 0);
2321 struct regcache
*regcache
= get_current_regcache ();
2322 struct gdbarch
*gdbarch
= get_regcache_arch (regcache
);
2323 struct thread_info
*tp
= inferior_thread ();
2324 CORE_ADDR pc
= regcache_read_pc (regcache
);
2325 struct address_space
*aspace
= get_regcache_aspace (regcache
);
2327 /* This represents the user's step vs continue request. When
2328 deciding whether "set scheduler-locking step" applies, it's the
2329 user's intention that counts. */
2330 const int user_step
= tp
->control
.stepping_command
;
2331 /* This represents what we'll actually request the target to do.
2332 This can decay from a step to a continue, if e.g., we need to
2333 implement single-stepping with breakpoints (software
2337 gdb_assert (!thread_is_in_step_over_chain (tp
));
2341 if (tp
->suspend
.waitstatus_pending_p
)
2347 statstr
= target_waitstatus_to_string (&tp
->suspend
.waitstatus
);
2348 fprintf_unfiltered (gdb_stdlog
,
2349 "infrun: resume: thread %s has pending wait status %s "
2350 "(currently_stepping=%d).\n",
2351 target_pid_to_str (tp
->ptid
), statstr
,
2352 currently_stepping (tp
));
2358 /* FIXME: What should we do if we are supposed to resume this
2359 thread with a signal? Maybe we should maintain a queue of
2360 pending signals to deliver. */
2361 if (sig
!= GDB_SIGNAL_0
)
2363 warning (_("Couldn't deliver signal %s to %s."),
2364 gdb_signal_to_name (sig
), target_pid_to_str (tp
->ptid
));
2367 tp
->suspend
.stop_signal
= GDB_SIGNAL_0
;
2368 discard_cleanups (old_cleanups
);
2370 if (target_can_async_p ())
2375 tp
->stepped_breakpoint
= 0;
2377 /* Depends on stepped_breakpoint. */
2378 step
= currently_stepping (tp
);
2380 if (current_inferior ()->waiting_for_vfork_done
)
2382 /* Don't try to single-step a vfork parent that is waiting for
2383 the child to get out of the shared memory region (by exec'ing
2384 or exiting). This is particularly important on software
2385 single-step archs, as the child process would trip on the
2386 software single step breakpoint inserted for the parent
2387 process. Since the parent will not actually execute any
2388 instruction until the child is out of the shared region (such
2389 are vfork's semantics), it is safe to simply continue it.
2390 Eventually, we'll see a TARGET_WAITKIND_VFORK_DONE event for
2391 the parent, and tell it to `keep_going', which automatically
2392 re-sets it stepping. */
2394 fprintf_unfiltered (gdb_stdlog
,
2395 "infrun: resume : clear step\n");
2400 fprintf_unfiltered (gdb_stdlog
,
2401 "infrun: resume (step=%d, signal=%s), "
2402 "trap_expected=%d, current thread [%s] at %s\n",
2403 step
, gdb_signal_to_symbol_string (sig
),
2404 tp
->control
.trap_expected
,
2405 target_pid_to_str (inferior_ptid
),
2406 paddress (gdbarch
, pc
));
2408 /* Normally, by the time we reach `resume', the breakpoints are either
2409 removed or inserted, as appropriate. The exception is if we're sitting
2410 at a permanent breakpoint; we need to step over it, but permanent
2411 breakpoints can't be removed. So we have to test for it here. */
2412 if (breakpoint_here_p (aspace
, pc
) == permanent_breakpoint_here
)
2414 if (sig
!= GDB_SIGNAL_0
)
2416 /* We have a signal to pass to the inferior. The resume
2417 may, or may not take us to the signal handler. If this
2418 is a step, we'll need to stop in the signal handler, if
2419 there's one, (if the target supports stepping into
2420 handlers), or in the next mainline instruction, if
2421 there's no handler. If this is a continue, we need to be
2422 sure to run the handler with all breakpoints inserted.
2423 In all cases, set a breakpoint at the current address
2424 (where the handler returns to), and once that breakpoint
2425 is hit, resume skipping the permanent breakpoint. If
2426 that breakpoint isn't hit, then we've stepped into the
2427 signal handler (or hit some other event). We'll delete
2428 the step-resume breakpoint then. */
2431 fprintf_unfiltered (gdb_stdlog
,
2432 "infrun: resume: skipping permanent breakpoint, "
2433 "deliver signal first\n");
2435 clear_step_over_info ();
2436 tp
->control
.trap_expected
= 0;
2438 if (tp
->control
.step_resume_breakpoint
== NULL
)
2440 /* Set a "high-priority" step-resume, as we don't want
2441 user breakpoints at PC to trigger (again) when this
2443 insert_hp_step_resume_breakpoint_at_frame (get_current_frame ());
2444 gdb_assert (tp
->control
.step_resume_breakpoint
->loc
->permanent
);
2446 tp
->step_after_step_resume_breakpoint
= step
;
2449 insert_breakpoints ();
2453 /* There's no signal to pass, we can go ahead and skip the
2454 permanent breakpoint manually. */
2456 fprintf_unfiltered (gdb_stdlog
,
2457 "infrun: resume: skipping permanent breakpoint\n");
2458 gdbarch_skip_permanent_breakpoint (gdbarch
, regcache
);
2459 /* Update pc to reflect the new address from which we will
2460 execute instructions. */
2461 pc
= regcache_read_pc (regcache
);
2465 /* We've already advanced the PC, so the stepping part
2466 is done. Now we need to arrange for a trap to be
2467 reported to handle_inferior_event. Set a breakpoint
2468 at the current PC, and run to it. Don't update
2469 prev_pc, because if we end in
2470 switch_back_to_stepped_thread, we want the "expected
2471 thread advanced also" branch to be taken. IOW, we
2472 don't want this thread to step further from PC
2474 gdb_assert (!step_over_info_valid_p ());
2475 insert_single_step_breakpoint (gdbarch
, aspace
, pc
);
2476 insert_breakpoints ();
2478 resume_ptid
= internal_resume_ptid (user_step
);
2479 do_target_resume (resume_ptid
, 0, GDB_SIGNAL_0
);
2480 discard_cleanups (old_cleanups
);
2487 /* If we have a breakpoint to step over, make sure to do a single
2488 step only. Same if we have software watchpoints. */
2489 if (tp
->control
.trap_expected
|| bpstat_should_step ())
2490 tp
->control
.may_range_step
= 0;
2492 /* If enabled, step over breakpoints by executing a copy of the
2493 instruction at a different address.
2495 We can't use displaced stepping when we have a signal to deliver;
2496 the comments for displaced_step_prepare explain why. The
2497 comments in the handle_inferior event for dealing with 'random
2498 signals' explain what we do instead.
2500 We can't use displaced stepping when we are waiting for vfork_done
2501 event, displaced stepping breaks the vfork child similarly as single
2502 step software breakpoint. */
2503 if (tp
->control
.trap_expected
2504 && use_displaced_stepping (tp
)
2505 && !step_over_info_valid_p ()
2506 && sig
== GDB_SIGNAL_0
2507 && !current_inferior ()->waiting_for_vfork_done
)
2509 int prepared
= displaced_step_prepare (inferior_ptid
);
2514 fprintf_unfiltered (gdb_stdlog
,
2515 "Got placed in step-over queue\n");
2517 tp
->control
.trap_expected
= 0;
2518 discard_cleanups (old_cleanups
);
2521 else if (prepared
< 0)
2523 /* Fallback to stepping over the breakpoint in-line. */
2525 if (target_is_non_stop_p ())
2526 stop_all_threads ();
2528 set_step_over_info (get_regcache_aspace (regcache
),
2529 regcache_read_pc (regcache
), 0);
2531 step
= maybe_software_singlestep (gdbarch
, pc
);
2533 insert_breakpoints ();
2535 else if (prepared
> 0)
2537 struct displaced_step_inferior_state
*displaced
;
2539 /* Update pc to reflect the new address from which we will
2540 execute instructions due to displaced stepping. */
2541 pc
= regcache_read_pc (get_thread_regcache (inferior_ptid
));
2543 displaced
= get_displaced_stepping_state (ptid_get_pid (inferior_ptid
));
2544 step
= gdbarch_displaced_step_hw_singlestep (gdbarch
,
2545 displaced
->step_closure
);
2549 /* Do we need to do it the hard way, w/temp breakpoints? */
2551 step
= maybe_software_singlestep (gdbarch
, pc
);
2553 /* Currently, our software single-step implementation leads to different
2554 results than hardware single-stepping in one situation: when stepping
2555 into delivering a signal which has an associated signal handler,
2556 hardware single-step will stop at the first instruction of the handler,
2557 while software single-step will simply skip execution of the handler.
2559 For now, this difference in behavior is accepted since there is no
2560 easy way to actually implement single-stepping into a signal handler
2561 without kernel support.
2563 However, there is one scenario where this difference leads to follow-on
2564 problems: if we're stepping off a breakpoint by removing all breakpoints
2565 and then single-stepping. In this case, the software single-step
2566 behavior means that even if there is a *breakpoint* in the signal
2567 handler, GDB still would not stop.
2569 Fortunately, we can at least fix this particular issue. We detect
2570 here the case where we are about to deliver a signal while software
2571 single-stepping with breakpoints removed. In this situation, we
2572 revert the decisions to remove all breakpoints and insert single-
2573 step breakpoints, and instead we install a step-resume breakpoint
2574 at the current address, deliver the signal without stepping, and
2575 once we arrive back at the step-resume breakpoint, actually step
2576 over the breakpoint we originally wanted to step over. */
2577 if (thread_has_single_step_breakpoints_set (tp
)
2578 && sig
!= GDB_SIGNAL_0
2579 && step_over_info_valid_p ())
2581 /* If we have nested signals or a pending signal is delivered
2582 immediately after a handler returns, might might already have
2583 a step-resume breakpoint set on the earlier handler. We cannot
2584 set another step-resume breakpoint; just continue on until the
2585 original breakpoint is hit. */
2586 if (tp
->control
.step_resume_breakpoint
== NULL
)
2588 insert_hp_step_resume_breakpoint_at_frame (get_current_frame ());
2589 tp
->step_after_step_resume_breakpoint
= 1;
2592 delete_single_step_breakpoints (tp
);
2594 clear_step_over_info ();
2595 tp
->control
.trap_expected
= 0;
2597 insert_breakpoints ();
2600 /* If STEP is set, it's a request to use hardware stepping
2601 facilities. But in that case, we should never
2602 use singlestep breakpoint. */
2603 gdb_assert (!(thread_has_single_step_breakpoints_set (tp
) && step
));
2605 /* Decide the set of threads to ask the target to resume. */
2606 if ((step
|| thread_has_single_step_breakpoints_set (tp
))
2607 && tp
->control
.trap_expected
)
2609 /* We're allowing a thread to run past a breakpoint it has
2610 hit, by single-stepping the thread with the breakpoint
2611 removed. In which case, we need to single-step only this
2612 thread, and keep others stopped, as they can miss this
2613 breakpoint if allowed to run. */
2614 resume_ptid
= inferior_ptid
;
2617 resume_ptid
= internal_resume_ptid (user_step
);
2619 if (execution_direction
!= EXEC_REVERSE
2620 && step
&& breakpoint_inserted_here_p (aspace
, pc
))
2622 /* There are two cases where we currently need to step a
2623 breakpoint instruction when we have a signal to deliver:
2625 - See handle_signal_stop where we handle random signals that
2626 could take out us out of the stepping range. Normally, in
2627 that case we end up continuing (instead of stepping) over the
2628 signal handler with a breakpoint at PC, but there are cases
2629 where we should _always_ single-step, even if we have a
2630 step-resume breakpoint, like when a software watchpoint is
2631 set. Assuming single-stepping and delivering a signal at the
2632 same time would takes us to the signal handler, then we could
2633 have removed the breakpoint at PC to step over it. However,
2634 some hardware step targets (like e.g., Mac OS) can't step
2635 into signal handlers, and for those, we need to leave the
2636 breakpoint at PC inserted, as otherwise if the handler
2637 recurses and executes PC again, it'll miss the breakpoint.
2638 So we leave the breakpoint inserted anyway, but we need to
2639 record that we tried to step a breakpoint instruction, so
2640 that adjust_pc_after_break doesn't end up confused.
2642 - In non-stop if we insert a breakpoint (e.g., a step-resume)
2643 in one thread after another thread that was stepping had been
2644 momentarily paused for a step-over. When we re-resume the
2645 stepping thread, it may be resumed from that address with a
2646 breakpoint that hasn't trapped yet. Seen with
2647 gdb.threads/non-stop-fair-events.exp, on targets that don't
2648 do displaced stepping. */
2651 fprintf_unfiltered (gdb_stdlog
,
2652 "infrun: resume: [%s] stepped breakpoint\n",
2653 target_pid_to_str (tp
->ptid
));
2655 tp
->stepped_breakpoint
= 1;
2657 /* Most targets can step a breakpoint instruction, thus
2658 executing it normally. But if this one cannot, just
2659 continue and we will hit it anyway. */
2660 if (gdbarch_cannot_step_breakpoint (gdbarch
))
2665 && tp
->control
.trap_expected
2666 && use_displaced_stepping (tp
)
2667 && !step_over_info_valid_p ())
2669 struct regcache
*resume_regcache
= get_thread_regcache (tp
->ptid
);
2670 struct gdbarch
*resume_gdbarch
= get_regcache_arch (resume_regcache
);
2671 CORE_ADDR actual_pc
= regcache_read_pc (resume_regcache
);
2674 fprintf_unfiltered (gdb_stdlog
, "displaced: run %s: ",
2675 paddress (resume_gdbarch
, actual_pc
));
2676 read_memory (actual_pc
, buf
, sizeof (buf
));
2677 displaced_step_dump_bytes (gdb_stdlog
, buf
, sizeof (buf
));
2680 if (tp
->control
.may_range_step
)
2682 /* If we're resuming a thread with the PC out of the step
2683 range, then we're doing some nested/finer run control
2684 operation, like stepping the thread out of the dynamic
2685 linker or the displaced stepping scratch pad. We
2686 shouldn't have allowed a range step then. */
2687 gdb_assert (pc_in_thread_step_range (pc
, tp
));
2690 do_target_resume (resume_ptid
, step
, sig
);
2692 discard_cleanups (old_cleanups
);
2697 /* Clear out all variables saying what to do when inferior is continued.
2698 First do this, then set the ones you want, then call `proceed'. */
2701 clear_proceed_status_thread (struct thread_info
*tp
)
2704 fprintf_unfiltered (gdb_stdlog
,
2705 "infrun: clear_proceed_status_thread (%s)\n",
2706 target_pid_to_str (tp
->ptid
));
2708 /* If we're starting a new sequence, then the previous finished
2709 single-step is no longer relevant. */
2710 if (tp
->suspend
.waitstatus_pending_p
)
2712 if (tp
->suspend
.stop_reason
== TARGET_STOPPED_BY_SINGLE_STEP
)
2715 fprintf_unfiltered (gdb_stdlog
,
2716 "infrun: clear_proceed_status: pending "
2717 "event of %s was a finished step. "
2719 target_pid_to_str (tp
->ptid
));
2721 tp
->suspend
.waitstatus_pending_p
= 0;
2722 tp
->suspend
.stop_reason
= TARGET_STOPPED_BY_NO_REASON
;
2724 else if (debug_infrun
)
2728 statstr
= target_waitstatus_to_string (&tp
->suspend
.waitstatus
);
2729 fprintf_unfiltered (gdb_stdlog
,
2730 "infrun: clear_proceed_status_thread: thread %s "
2731 "has pending wait status %s "
2732 "(currently_stepping=%d).\n",
2733 target_pid_to_str (tp
->ptid
), statstr
,
2734 currently_stepping (tp
));
2739 /* If this signal should not be seen by program, give it zero.
2740 Used for debugging signals. */
2741 if (!signal_pass_state (tp
->suspend
.stop_signal
))
2742 tp
->suspend
.stop_signal
= GDB_SIGNAL_0
;
2744 tp
->control
.trap_expected
= 0;
2745 tp
->control
.step_range_start
= 0;
2746 tp
->control
.step_range_end
= 0;
2747 tp
->control
.may_range_step
= 0;
2748 tp
->control
.step_frame_id
= null_frame_id
;
2749 tp
->control
.step_stack_frame_id
= null_frame_id
;
2750 tp
->control
.step_over_calls
= STEP_OVER_UNDEBUGGABLE
;
2751 tp
->control
.step_start_function
= NULL
;
2752 tp
->stop_requested
= 0;
2754 tp
->control
.stop_step
= 0;
2756 tp
->control
.proceed_to_finish
= 0;
2758 tp
->control
.command_interp
= NULL
;
2759 tp
->control
.stepping_command
= 0;
2761 /* Discard any remaining commands or status from previous stop. */
2762 bpstat_clear (&tp
->control
.stop_bpstat
);
2766 clear_proceed_status (int step
)
2770 struct thread_info
*tp
;
2773 resume_ptid
= user_visible_resume_ptid (step
);
2775 /* In all-stop mode, delete the per-thread status of all threads
2776 we're about to resume, implicitly and explicitly. */
2777 ALL_NON_EXITED_THREADS (tp
)
2779 if (!ptid_match (tp
->ptid
, resume_ptid
))
2781 clear_proceed_status_thread (tp
);
2785 if (!ptid_equal (inferior_ptid
, null_ptid
))
2787 struct inferior
*inferior
;
2791 /* If in non-stop mode, only delete the per-thread status of
2792 the current thread. */
2793 clear_proceed_status_thread (inferior_thread ());
2796 inferior
= current_inferior ();
2797 inferior
->control
.stop_soon
= NO_STOP_QUIETLY
;
2800 stop_after_trap
= 0;
2802 observer_notify_about_to_proceed ();
2805 /* Returns true if TP is still stopped at a breakpoint that needs
2806 stepping-over in order to make progress. If the breakpoint is gone
2807 meanwhile, we can skip the whole step-over dance. */
2810 thread_still_needs_step_over_bp (struct thread_info
*tp
)
2812 if (tp
->stepping_over_breakpoint
)
2814 struct regcache
*regcache
= get_thread_regcache (tp
->ptid
);
2816 if (breakpoint_here_p (get_regcache_aspace (regcache
),
2817 regcache_read_pc (regcache
))
2818 == ordinary_breakpoint_here
)
2821 tp
->stepping_over_breakpoint
= 0;
2827 /* Check whether thread TP still needs to start a step-over in order
2828 to make progress when resumed. Returns an bitwise or of enum
2829 step_over_what bits, indicating what needs to be stepped over. */
2832 thread_still_needs_step_over (struct thread_info
*tp
)
2834 struct inferior
*inf
= find_inferior_ptid (tp
->ptid
);
2837 if (thread_still_needs_step_over_bp (tp
))
2838 what
|= STEP_OVER_BREAKPOINT
;
2840 if (tp
->stepping_over_watchpoint
2841 && !target_have_steppable_watchpoint
)
2842 what
|= STEP_OVER_WATCHPOINT
;
2847 /* Returns true if scheduler locking applies. STEP indicates whether
2848 we're about to do a step/next-like command to a thread. */
2851 schedlock_applies (struct thread_info
*tp
)
2853 return (scheduler_mode
== schedlock_on
2854 || (scheduler_mode
== schedlock_step
2855 && tp
->control
.stepping_command
));
2858 /* Basic routine for continuing the program in various fashions.
2860 ADDR is the address to resume at, or -1 for resume where stopped.
2861 SIGGNAL is the signal to give it, or 0 for none,
2862 or -1 for act according to how it stopped.
2863 STEP is nonzero if should trap after one instruction.
2864 -1 means return after that and print nothing.
2865 You should probably set various step_... variables
2866 before calling here, if you are stepping.
2868 You should call clear_proceed_status before calling proceed. */
2871 proceed (CORE_ADDR addr
, enum gdb_signal siggnal
)
2873 struct regcache
*regcache
;
2874 struct gdbarch
*gdbarch
;
2875 struct thread_info
*tp
;
2877 struct address_space
*aspace
;
2879 struct execution_control_state ecss
;
2880 struct execution_control_state
*ecs
= &ecss
;
2881 struct cleanup
*old_chain
;
2884 /* If we're stopped at a fork/vfork, follow the branch set by the
2885 "set follow-fork-mode" command; otherwise, we'll just proceed
2886 resuming the current thread. */
2887 if (!follow_fork ())
2889 /* The target for some reason decided not to resume. */
2891 if (target_can_async_p ())
2892 inferior_event_handler (INF_EXEC_COMPLETE
, NULL
);
2896 /* We'll update this if & when we switch to a new thread. */
2897 previous_inferior_ptid
= inferior_ptid
;
2899 regcache
= get_current_regcache ();
2900 gdbarch
= get_regcache_arch (regcache
);
2901 aspace
= get_regcache_aspace (regcache
);
2902 pc
= regcache_read_pc (regcache
);
2903 tp
= inferior_thread ();
2905 /* Fill in with reasonable starting values. */
2906 init_thread_stepping_state (tp
);
2908 gdb_assert (!thread_is_in_step_over_chain (tp
));
2910 if (addr
== (CORE_ADDR
) -1)
2913 && breakpoint_here_p (aspace
, pc
) == ordinary_breakpoint_here
2914 && execution_direction
!= EXEC_REVERSE
)
2915 /* There is a breakpoint at the address we will resume at,
2916 step one instruction before inserting breakpoints so that
2917 we do not stop right away (and report a second hit at this
2920 Note, we don't do this in reverse, because we won't
2921 actually be executing the breakpoint insn anyway.
2922 We'll be (un-)executing the previous instruction. */
2923 tp
->stepping_over_breakpoint
= 1;
2924 else if (gdbarch_single_step_through_delay_p (gdbarch
)
2925 && gdbarch_single_step_through_delay (gdbarch
,
2926 get_current_frame ()))
2927 /* We stepped onto an instruction that needs to be stepped
2928 again before re-inserting the breakpoint, do so. */
2929 tp
->stepping_over_breakpoint
= 1;
2933 regcache_write_pc (regcache
, addr
);
2936 if (siggnal
!= GDB_SIGNAL_DEFAULT
)
2937 tp
->suspend
.stop_signal
= siggnal
;
2939 /* Record the interpreter that issued the execution command that
2940 caused this thread to resume. If the top level interpreter is
2941 MI/async, and the execution command was a CLI command
2942 (next/step/etc.), we'll want to print stop event output to the MI
2943 console channel (the stepped-to line, etc.), as if the user
2944 entered the execution command on a real GDB console. */
2945 tp
->control
.command_interp
= command_interp ();
2947 resume_ptid
= user_visible_resume_ptid (tp
->control
.stepping_command
);
2949 /* If an exception is thrown from this point on, make sure to
2950 propagate GDB's knowledge of the executing state to the
2951 frontend/user running state. */
2952 old_chain
= make_cleanup (finish_thread_state_cleanup
, &resume_ptid
);
2954 /* Even if RESUME_PTID is a wildcard, and we end up resuming fewer
2955 threads (e.g., we might need to set threads stepping over
2956 breakpoints first), from the user/frontend's point of view, all
2957 threads in RESUME_PTID are now running. Unless we're calling an
2958 inferior function, as in that case we pretend the inferior
2959 doesn't run at all. */
2960 if (!tp
->control
.in_infcall
)
2961 set_running (resume_ptid
, 1);
2964 fprintf_unfiltered (gdb_stdlog
,
2965 "infrun: proceed (addr=%s, signal=%s)\n",
2966 paddress (gdbarch
, addr
),
2967 gdb_signal_to_symbol_string (siggnal
));
2969 annotate_starting ();
2971 /* Make sure that output from GDB appears before output from the
2973 gdb_flush (gdb_stdout
);
2975 /* In a multi-threaded task we may select another thread and
2976 then continue or step.
2978 But if a thread that we're resuming had stopped at a breakpoint,
2979 it will immediately cause another breakpoint stop without any
2980 execution (i.e. it will report a breakpoint hit incorrectly). So
2981 we must step over it first.
2983 Look for threads other than the current (TP) that reported a
2984 breakpoint hit and haven't been resumed yet since. */
2986 /* If scheduler locking applies, we can avoid iterating over all
2988 if (!non_stop
&& !schedlock_applies (tp
))
2990 struct thread_info
*current
= tp
;
2992 ALL_NON_EXITED_THREADS (tp
)
2994 /* Ignore the current thread here. It's handled
2999 /* Ignore threads of processes we're not resuming. */
3000 if (!ptid_match (tp
->ptid
, resume_ptid
))
3003 if (!thread_still_needs_step_over (tp
))
3006 gdb_assert (!thread_is_in_step_over_chain (tp
));
3009 fprintf_unfiltered (gdb_stdlog
,
3010 "infrun: need to step-over [%s] first\n",
3011 target_pid_to_str (tp
->ptid
));
3013 thread_step_over_chain_enqueue (tp
);
3019 /* Enqueue the current thread last, so that we move all other
3020 threads over their breakpoints first. */
3021 if (tp
->stepping_over_breakpoint
)
3022 thread_step_over_chain_enqueue (tp
);
3024 /* If the thread isn't started, we'll still need to set its prev_pc,
3025 so that switch_back_to_stepped_thread knows the thread hasn't
3026 advanced. Must do this before resuming any thread, as in
3027 all-stop/remote, once we resume we can't send any other packet
3028 until the target stops again. */
3029 tp
->prev_pc
= regcache_read_pc (regcache
);
3031 started
= start_step_over ();
3033 if (step_over_info_valid_p ())
3035 /* Either this thread started a new in-line step over, or some
3036 other thread was already doing one. In either case, don't
3037 resume anything else until the step-over is finished. */
3039 else if (started
&& !target_is_non_stop_p ())
3041 /* A new displaced stepping sequence was started. In all-stop,
3042 we can't talk to the target anymore until it next stops. */
3044 else if (!non_stop
&& target_is_non_stop_p ())
3046 /* In all-stop, but the target is always in non-stop mode.
3047 Start all other threads that are implicitly resumed too. */
3048 ALL_NON_EXITED_THREADS (tp
)
3050 /* Ignore threads of processes we're not resuming. */
3051 if (!ptid_match (tp
->ptid
, resume_ptid
))
3057 fprintf_unfiltered (gdb_stdlog
,
3058 "infrun: proceed: [%s] resumed\n",
3059 target_pid_to_str (tp
->ptid
));
3060 gdb_assert (tp
->executing
|| tp
->suspend
.waitstatus_pending_p
);
3064 if (thread_is_in_step_over_chain (tp
))
3067 fprintf_unfiltered (gdb_stdlog
,
3068 "infrun: proceed: [%s] needs step-over\n",
3069 target_pid_to_str (tp
->ptid
));
3074 fprintf_unfiltered (gdb_stdlog
,
3075 "infrun: proceed: resuming %s\n",
3076 target_pid_to_str (tp
->ptid
));
3078 reset_ecs (ecs
, tp
);
3079 switch_to_thread (tp
->ptid
);
3080 keep_going_pass_signal (ecs
);
3081 if (!ecs
->wait_some_more
)
3082 error (_("Command aborted."));
3085 else if (!tp
->resumed
&& !thread_is_in_step_over_chain (tp
))
3087 /* The thread wasn't started, and isn't queued, run it now. */
3088 reset_ecs (ecs
, tp
);
3089 switch_to_thread (tp
->ptid
);
3090 keep_going_pass_signal (ecs
);
3091 if (!ecs
->wait_some_more
)
3092 error (_("Command aborted."));
3095 discard_cleanups (old_chain
);
3097 /* Wait for it to stop (if not standalone)
3098 and in any case decode why it stopped, and act accordingly. */
3099 /* Do this only if we are not using the event loop, or if the target
3100 does not support asynchronous execution. */
3101 if (!target_can_async_p ())
3103 wait_for_inferior ();
3109 /* Start remote-debugging of a machine over a serial link. */
3112 start_remote (int from_tty
)
3114 struct inferior
*inferior
;
3116 inferior
= current_inferior ();
3117 inferior
->control
.stop_soon
= STOP_QUIETLY_REMOTE
;
3119 /* Always go on waiting for the target, regardless of the mode. */
3120 /* FIXME: cagney/1999-09-23: At present it isn't possible to
3121 indicate to wait_for_inferior that a target should timeout if
3122 nothing is returned (instead of just blocking). Because of this,
3123 targets expecting an immediate response need to, internally, set
3124 things up so that the target_wait() is forced to eventually
3126 /* FIXME: cagney/1999-09-24: It isn't possible for target_open() to
3127 differentiate to its caller what the state of the target is after
3128 the initial open has been performed. Here we're assuming that
3129 the target has stopped. It should be possible to eventually have
3130 target_open() return to the caller an indication that the target
3131 is currently running and GDB state should be set to the same as
3132 for an async run. */
3133 wait_for_inferior ();
3135 /* Now that the inferior has stopped, do any bookkeeping like
3136 loading shared libraries. We want to do this before normal_stop,
3137 so that the displayed frame is up to date. */
3138 post_create_inferior (¤t_target
, from_tty
);
3143 /* Initialize static vars when a new inferior begins. */
3146 init_wait_for_inferior (void)
3148 /* These are meaningless until the first time through wait_for_inferior. */
3150 breakpoint_init_inferior (inf_starting
);
3152 clear_proceed_status (0);
3154 target_last_wait_ptid
= minus_one_ptid
;
3156 previous_inferior_ptid
= inferior_ptid
;
3158 /* Discard any skipped inlined frames. */
3159 clear_inline_frame_state (minus_one_ptid
);
3164 static void handle_inferior_event (struct execution_control_state
*ecs
);
3166 static void handle_step_into_function (struct gdbarch
*gdbarch
,
3167 struct execution_control_state
*ecs
);
3168 static void handle_step_into_function_backward (struct gdbarch
*gdbarch
,
3169 struct execution_control_state
*ecs
);
3170 static void handle_signal_stop (struct execution_control_state
*ecs
);
3171 static void check_exception_resume (struct execution_control_state
*,
3172 struct frame_info
*);
3174 static void end_stepping_range (struct execution_control_state
*ecs
);
3175 static void stop_waiting (struct execution_control_state
*ecs
);
3176 static void keep_going (struct execution_control_state
*ecs
);
3177 static void process_event_stop_test (struct execution_control_state
*ecs
);
3178 static int switch_back_to_stepped_thread (struct execution_control_state
*ecs
);
3180 /* Callback for iterate over threads. If the thread is stopped, but
3181 the user/frontend doesn't know about that yet, go through
3182 normal_stop, as if the thread had just stopped now. ARG points at
3183 a ptid. If PTID is MINUS_ONE_PTID, applies to all threads. If
3184 ptid_is_pid(PTID) is true, applies to all threads of the process
3185 pointed at by PTID. Otherwise, apply only to the thread pointed by
3189 infrun_thread_stop_requested_callback (struct thread_info
*info
, void *arg
)
3191 ptid_t ptid
= * (ptid_t
*) arg
;
3193 if ((ptid_equal (info
->ptid
, ptid
)
3194 || ptid_equal (minus_one_ptid
, ptid
)
3195 || (ptid_is_pid (ptid
)
3196 && ptid_get_pid (ptid
) == ptid_get_pid (info
->ptid
)))
3197 && is_running (info
->ptid
)
3198 && !is_executing (info
->ptid
))
3200 struct cleanup
*old_chain
;
3201 struct execution_control_state ecss
;
3202 struct execution_control_state
*ecs
= &ecss
;
3204 memset (ecs
, 0, sizeof (*ecs
));
3206 old_chain
= make_cleanup_restore_current_thread ();
3208 overlay_cache_invalid
= 1;
3209 /* Flush target cache before starting to handle each event.
3210 Target was running and cache could be stale. This is just a
3211 heuristic. Running threads may modify target memory, but we
3212 don't get any event. */
3213 target_dcache_invalidate ();
3215 /* Go through handle_inferior_event/normal_stop, so we always
3216 have consistent output as if the stop event had been
3218 ecs
->ptid
= info
->ptid
;
3219 ecs
->event_thread
= find_thread_ptid (info
->ptid
);
3220 ecs
->ws
.kind
= TARGET_WAITKIND_STOPPED
;
3221 ecs
->ws
.value
.sig
= GDB_SIGNAL_0
;
3223 handle_inferior_event (ecs
);
3225 if (!ecs
->wait_some_more
)
3227 struct thread_info
*tp
;
3231 /* Finish off the continuations. */
3232 tp
= inferior_thread ();
3233 do_all_intermediate_continuations_thread (tp
, 1);
3234 do_all_continuations_thread (tp
, 1);
3237 do_cleanups (old_chain
);
3243 /* This function is attached as a "thread_stop_requested" observer.
3244 Cleanup local state that assumed the PTID was to be resumed, and
3245 report the stop to the frontend. */
3248 infrun_thread_stop_requested (ptid_t ptid
)
3250 struct thread_info
*tp
;
3252 /* PTID was requested to stop. Remove matching threads from the
3253 step-over queue, so we don't try to resume them
3255 ALL_NON_EXITED_THREADS (tp
)
3256 if (ptid_match (tp
->ptid
, ptid
))
3258 if (thread_is_in_step_over_chain (tp
))
3259 thread_step_over_chain_remove (tp
);
3262 iterate_over_threads (infrun_thread_stop_requested_callback
, &ptid
);
3266 infrun_thread_thread_exit (struct thread_info
*tp
, int silent
)
3268 if (ptid_equal (target_last_wait_ptid
, tp
->ptid
))
3269 nullify_last_target_wait_ptid ();
3272 /* Delete the step resume, single-step and longjmp/exception resume
3273 breakpoints of TP. */
3276 delete_thread_infrun_breakpoints (struct thread_info
*tp
)
3278 delete_step_resume_breakpoint (tp
);
3279 delete_exception_resume_breakpoint (tp
);
3280 delete_single_step_breakpoints (tp
);
3283 /* If the target still has execution, call FUNC for each thread that
3284 just stopped. In all-stop, that's all the non-exited threads; in
3285 non-stop, that's the current thread, only. */
3287 typedef void (*for_each_just_stopped_thread_callback_func
)
3288 (struct thread_info
*tp
);
3291 for_each_just_stopped_thread (for_each_just_stopped_thread_callback_func func
)
3293 if (!target_has_execution
|| ptid_equal (inferior_ptid
, null_ptid
))
3296 if (target_is_non_stop_p ())
3298 /* If in non-stop mode, only the current thread stopped. */
3299 func (inferior_thread ());
3303 struct thread_info
*tp
;
3305 /* In all-stop mode, all threads have stopped. */
3306 ALL_NON_EXITED_THREADS (tp
)
3313 /* Delete the step resume and longjmp/exception resume breakpoints of
3314 the threads that just stopped. */
3317 delete_just_stopped_threads_infrun_breakpoints (void)
3319 for_each_just_stopped_thread (delete_thread_infrun_breakpoints
);
3322 /* Delete the single-step breakpoints of the threads that just
3326 delete_just_stopped_threads_single_step_breakpoints (void)
3328 for_each_just_stopped_thread (delete_single_step_breakpoints
);
3331 /* A cleanup wrapper. */
3334 delete_just_stopped_threads_infrun_breakpoints_cleanup (void *arg
)
3336 delete_just_stopped_threads_infrun_breakpoints ();
3342 print_target_wait_results (ptid_t waiton_ptid
, ptid_t result_ptid
,
3343 const struct target_waitstatus
*ws
)
3345 char *status_string
= target_waitstatus_to_string (ws
);
3346 struct ui_file
*tmp_stream
= mem_fileopen ();
3349 /* The text is split over several lines because it was getting too long.
3350 Call fprintf_unfiltered (gdb_stdlog) once so that the text is still
3351 output as a unit; we want only one timestamp printed if debug_timestamp
3354 fprintf_unfiltered (tmp_stream
,
3355 "infrun: target_wait (%d.%ld.%ld",
3356 ptid_get_pid (waiton_ptid
),
3357 ptid_get_lwp (waiton_ptid
),
3358 ptid_get_tid (waiton_ptid
));
3359 if (ptid_get_pid (waiton_ptid
) != -1)
3360 fprintf_unfiltered (tmp_stream
,
3361 " [%s]", target_pid_to_str (waiton_ptid
));
3362 fprintf_unfiltered (tmp_stream
, ", status) =\n");
3363 fprintf_unfiltered (tmp_stream
,
3364 "infrun: %d.%ld.%ld [%s],\n",
3365 ptid_get_pid (result_ptid
),
3366 ptid_get_lwp (result_ptid
),
3367 ptid_get_tid (result_ptid
),
3368 target_pid_to_str (result_ptid
));
3369 fprintf_unfiltered (tmp_stream
,
3373 text
= ui_file_xstrdup (tmp_stream
, NULL
);
3375 /* This uses %s in part to handle %'s in the text, but also to avoid
3376 a gcc error: the format attribute requires a string literal. */
3377 fprintf_unfiltered (gdb_stdlog
, "%s", text
);
3379 xfree (status_string
);
3381 ui_file_delete (tmp_stream
);
3384 /* Select a thread at random, out of those which are resumed and have
3387 static struct thread_info
*
3388 random_pending_event_thread (ptid_t waiton_ptid
)
3390 struct thread_info
*event_tp
;
3392 int random_selector
;
3394 /* First see how many events we have. Count only resumed threads
3395 that have an event pending. */
3396 ALL_NON_EXITED_THREADS (event_tp
)
3397 if (ptid_match (event_tp
->ptid
, waiton_ptid
)
3398 && event_tp
->resumed
3399 && event_tp
->suspend
.waitstatus_pending_p
)
3402 if (num_events
== 0)
3405 /* Now randomly pick a thread out of those that have had events. */
3406 random_selector
= (int)
3407 ((num_events
* (double) rand ()) / (RAND_MAX
+ 1.0));
3409 if (debug_infrun
&& num_events
> 1)
3410 fprintf_unfiltered (gdb_stdlog
,
3411 "infrun: Found %d events, selecting #%d\n",
3412 num_events
, random_selector
);
3414 /* Select the Nth thread that has had an event. */
3415 ALL_NON_EXITED_THREADS (event_tp
)
3416 if (ptid_match (event_tp
->ptid
, waiton_ptid
)
3417 && event_tp
->resumed
3418 && event_tp
->suspend
.waitstatus_pending_p
)
3419 if (random_selector
-- == 0)
3425 /* Wrapper for target_wait that first checks whether threads have
3426 pending statuses to report before actually asking the target for
3430 do_target_wait (ptid_t ptid
, struct target_waitstatus
*status
, int options
)
3433 struct thread_info
*tp
;
3435 /* First check if there is a resumed thread with a wait status
3437 if (ptid_equal (ptid
, minus_one_ptid
) || ptid_is_pid (ptid
))
3439 tp
= random_pending_event_thread (ptid
);
3444 fprintf_unfiltered (gdb_stdlog
,
3445 "infrun: Waiting for specific thread %s.\n",
3446 target_pid_to_str (ptid
));
3448 /* We have a specific thread to check. */
3449 tp
= find_thread_ptid (ptid
);
3450 gdb_assert (tp
!= NULL
);
3451 if (!tp
->suspend
.waitstatus_pending_p
)
3456 && (tp
->suspend
.stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
3457 || tp
->suspend
.stop_reason
== TARGET_STOPPED_BY_HW_BREAKPOINT
))
3459 struct regcache
*regcache
= get_thread_regcache (tp
->ptid
);
3460 struct gdbarch
*gdbarch
= get_regcache_arch (regcache
);
3464 pc
= regcache_read_pc (regcache
);
3466 if (pc
!= tp
->suspend
.stop_pc
)
3469 fprintf_unfiltered (gdb_stdlog
,
3470 "infrun: PC of %s changed. was=%s, now=%s\n",
3471 target_pid_to_str (tp
->ptid
),
3472 paddress (gdbarch
, tp
->prev_pc
),
3473 paddress (gdbarch
, pc
));
3476 else if (!breakpoint_inserted_here_p (get_regcache_aspace (regcache
), pc
))
3479 fprintf_unfiltered (gdb_stdlog
,
3480 "infrun: previous breakpoint of %s, at %s gone\n",
3481 target_pid_to_str (tp
->ptid
),
3482 paddress (gdbarch
, pc
));
3490 fprintf_unfiltered (gdb_stdlog
,
3491 "infrun: pending event of %s cancelled.\n",
3492 target_pid_to_str (tp
->ptid
));
3494 tp
->suspend
.waitstatus
.kind
= TARGET_WAITKIND_SPURIOUS
;
3495 tp
->suspend
.stop_reason
= TARGET_STOPPED_BY_NO_REASON
;
3505 statstr
= target_waitstatus_to_string (&tp
->suspend
.waitstatus
);
3506 fprintf_unfiltered (gdb_stdlog
,
3507 "infrun: Using pending wait status %s for %s.\n",
3509 target_pid_to_str (tp
->ptid
));
3513 /* Now that we've selected our final event LWP, un-adjust its PC
3514 if it was a software breakpoint (and the target doesn't
3515 always adjust the PC itself). */
3516 if (tp
->suspend
.stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
3517 && !target_supports_stopped_by_sw_breakpoint ())
3519 struct regcache
*regcache
;
3520 struct gdbarch
*gdbarch
;
3523 regcache
= get_thread_regcache (tp
->ptid
);
3524 gdbarch
= get_regcache_arch (regcache
);
3526 decr_pc
= gdbarch_decr_pc_after_break (gdbarch
);
3531 pc
= regcache_read_pc (regcache
);
3532 regcache_write_pc (regcache
, pc
+ decr_pc
);
3536 tp
->suspend
.stop_reason
= TARGET_STOPPED_BY_NO_REASON
;
3537 *status
= tp
->suspend
.waitstatus
;
3538 tp
->suspend
.waitstatus_pending_p
= 0;
3540 /* Wake up the event loop again, until all pending events are
3542 if (target_is_async_p ())
3543 mark_async_event_handler (infrun_async_inferior_event_token
);
3547 /* But if we don't find one, we'll have to wait. */
3549 if (deprecated_target_wait_hook
)
3550 event_ptid
= deprecated_target_wait_hook (ptid
, status
, options
);
3552 event_ptid
= target_wait (ptid
, status
, options
);
3557 /* Prepare and stabilize the inferior for detaching it. E.g.,
3558 detaching while a thread is displaced stepping is a recipe for
3559 crashing it, as nothing would readjust the PC out of the scratch
3563 prepare_for_detach (void)
3565 struct inferior
*inf
= current_inferior ();
3566 ptid_t pid_ptid
= pid_to_ptid (inf
->pid
);
3567 struct cleanup
*old_chain_1
;
3568 struct displaced_step_inferior_state
*displaced
;
3570 displaced
= get_displaced_stepping_state (inf
->pid
);
3572 /* Is any thread of this process displaced stepping? If not,
3573 there's nothing else to do. */
3574 if (displaced
== NULL
|| ptid_equal (displaced
->step_ptid
, null_ptid
))
3578 fprintf_unfiltered (gdb_stdlog
,
3579 "displaced-stepping in-process while detaching");
3581 old_chain_1
= make_cleanup_restore_integer (&inf
->detaching
);
3584 while (!ptid_equal (displaced
->step_ptid
, null_ptid
))
3586 struct cleanup
*old_chain_2
;
3587 struct execution_control_state ecss
;
3588 struct execution_control_state
*ecs
;
3591 memset (ecs
, 0, sizeof (*ecs
));
3593 overlay_cache_invalid
= 1;
3594 /* Flush target cache before starting to handle each event.
3595 Target was running and cache could be stale. This is just a
3596 heuristic. Running threads may modify target memory, but we
3597 don't get any event. */
3598 target_dcache_invalidate ();
3600 ecs
->ptid
= do_target_wait (pid_ptid
, &ecs
->ws
, 0);
3603 print_target_wait_results (pid_ptid
, ecs
->ptid
, &ecs
->ws
);
3605 /* If an error happens while handling the event, propagate GDB's
3606 knowledge of the executing state to the frontend/user running
3608 old_chain_2
= make_cleanup (finish_thread_state_cleanup
,
3611 /* Now figure out what to do with the result of the result. */
3612 handle_inferior_event (ecs
);
3614 /* No error, don't finish the state yet. */
3615 discard_cleanups (old_chain_2
);
3617 /* Breakpoints and watchpoints are not installed on the target
3618 at this point, and signals are passed directly to the
3619 inferior, so this must mean the process is gone. */
3620 if (!ecs
->wait_some_more
)
3622 discard_cleanups (old_chain_1
);
3623 error (_("Program exited while detaching"));
3627 discard_cleanups (old_chain_1
);
3630 /* Wait for control to return from inferior to debugger.
3632 If inferior gets a signal, we may decide to start it up again
3633 instead of returning. That is why there is a loop in this function.
3634 When this function actually returns it means the inferior
3635 should be left stopped and GDB should read more commands. */
3638 wait_for_inferior (void)
3640 struct cleanup
*old_cleanups
;
3641 struct cleanup
*thread_state_chain
;
3645 (gdb_stdlog
, "infrun: wait_for_inferior ()\n");
3648 = make_cleanup (delete_just_stopped_threads_infrun_breakpoints_cleanup
,
3651 /* If an error happens while handling the event, propagate GDB's
3652 knowledge of the executing state to the frontend/user running
3654 thread_state_chain
= make_cleanup (finish_thread_state_cleanup
, &minus_one_ptid
);
3658 struct execution_control_state ecss
;
3659 struct execution_control_state
*ecs
= &ecss
;
3660 ptid_t waiton_ptid
= minus_one_ptid
;
3662 memset (ecs
, 0, sizeof (*ecs
));
3664 overlay_cache_invalid
= 1;
3666 /* Flush target cache before starting to handle each event.
3667 Target was running and cache could be stale. This is just a
3668 heuristic. Running threads may modify target memory, but we
3669 don't get any event. */
3670 target_dcache_invalidate ();
3672 ecs
->ptid
= do_target_wait (waiton_ptid
, &ecs
->ws
, 0);
3675 print_target_wait_results (waiton_ptid
, ecs
->ptid
, &ecs
->ws
);
3677 /* Now figure out what to do with the result of the result. */
3678 handle_inferior_event (ecs
);
3680 if (!ecs
->wait_some_more
)
3684 /* No error, don't finish the state yet. */
3685 discard_cleanups (thread_state_chain
);
3687 do_cleanups (old_cleanups
);
3690 /* Cleanup that reinstalls the readline callback handler, if the
3691 target is running in the background. If while handling the target
3692 event something triggered a secondary prompt, like e.g., a
3693 pagination prompt, we'll have removed the callback handler (see
3694 gdb_readline_wrapper_line). Need to do this as we go back to the
3695 event loop, ready to process further input. Note this has no
3696 effect if the handler hasn't actually been removed, because calling
3697 rl_callback_handler_install resets the line buffer, thus losing
3701 reinstall_readline_callback_handler_cleanup (void *arg
)
3703 if (!interpreter_async
)
3705 /* We're not going back to the top level event loop yet. Don't
3706 install the readline callback, as it'd prep the terminal,
3707 readline-style (raw, noecho) (e.g., --batch). We'll install
3708 it the next time the prompt is displayed, when we're ready
3713 if (async_command_editing_p
&& !sync_execution
)
3714 gdb_rl_callback_handler_reinstall ();
3717 /* Asynchronous version of wait_for_inferior. It is called by the
3718 event loop whenever a change of state is detected on the file
3719 descriptor corresponding to the target. It can be called more than
3720 once to complete a single execution command. In such cases we need
3721 to keep the state in a global variable ECSS. If it is the last time
3722 that this function is called for a single execution command, then
3723 report to the user that the inferior has stopped, and do the
3724 necessary cleanups. */
3727 fetch_inferior_event (void *client_data
)
3729 struct execution_control_state ecss
;
3730 struct execution_control_state
*ecs
= &ecss
;
3731 struct cleanup
*old_chain
= make_cleanup (null_cleanup
, NULL
);
3732 struct cleanup
*ts_old_chain
;
3733 int was_sync
= sync_execution
;
3735 ptid_t waiton_ptid
= minus_one_ptid
;
3737 memset (ecs
, 0, sizeof (*ecs
));
3739 /* End up with readline processing input, if necessary. */
3740 make_cleanup (reinstall_readline_callback_handler_cleanup
, NULL
);
3742 /* We're handling a live event, so make sure we're doing live
3743 debugging. If we're looking at traceframes while the target is
3744 running, we're going to need to get back to that mode after
3745 handling the event. */
3748 make_cleanup_restore_current_traceframe ();
3749 set_current_traceframe (-1);
3753 /* In non-stop mode, the user/frontend should not notice a thread
3754 switch due to internal events. Make sure we reverse to the
3755 user selected thread and frame after handling the event and
3756 running any breakpoint commands. */
3757 make_cleanup_restore_current_thread ();
3759 overlay_cache_invalid
= 1;
3760 /* Flush target cache before starting to handle each event. Target
3761 was running and cache could be stale. This is just a heuristic.
3762 Running threads may modify target memory, but we don't get any
3764 target_dcache_invalidate ();
3766 make_cleanup_restore_integer (&execution_direction
);
3767 execution_direction
= target_execution_direction ();
3769 ecs
->ptid
= do_target_wait (waiton_ptid
, &ecs
->ws
, TARGET_WNOHANG
);
3772 print_target_wait_results (waiton_ptid
, ecs
->ptid
, &ecs
->ws
);
3774 /* If an error happens while handling the event, propagate GDB's
3775 knowledge of the executing state to the frontend/user running
3777 if (!target_is_non_stop_p ())
3778 ts_old_chain
= make_cleanup (finish_thread_state_cleanup
, &minus_one_ptid
);
3780 ts_old_chain
= make_cleanup (finish_thread_state_cleanup
, &ecs
->ptid
);
3782 /* Get executed before make_cleanup_restore_current_thread above to apply
3783 still for the thread which has thrown the exception. */
3784 make_bpstat_clear_actions_cleanup ();
3786 make_cleanup (delete_just_stopped_threads_infrun_breakpoints_cleanup
, NULL
);
3788 /* Now figure out what to do with the result of the result. */
3789 handle_inferior_event (ecs
);
3791 if (!ecs
->wait_some_more
)
3793 struct inferior
*inf
= find_inferior_ptid (ecs
->ptid
);
3795 delete_just_stopped_threads_infrun_breakpoints ();
3797 /* We may not find an inferior if this was a process exit. */
3798 if (inf
== NULL
|| inf
->control
.stop_soon
== NO_STOP_QUIETLY
)
3801 if (target_has_execution
3802 && ecs
->ws
.kind
!= TARGET_WAITKIND_NO_RESUMED
3803 && ecs
->ws
.kind
!= TARGET_WAITKIND_EXITED
3804 && ecs
->ws
.kind
!= TARGET_WAITKIND_SIGNALLED
3805 && ecs
->event_thread
->step_multi
3806 && ecs
->event_thread
->control
.stop_step
)
3807 inferior_event_handler (INF_EXEC_CONTINUE
, NULL
);
3810 inferior_event_handler (INF_EXEC_COMPLETE
, NULL
);
3815 /* No error, don't finish the thread states yet. */
3816 discard_cleanups (ts_old_chain
);
3818 /* Revert thread and frame. */
3819 do_cleanups (old_chain
);
3821 /* If the inferior was in sync execution mode, and now isn't,
3822 restore the prompt (a synchronous execution command has finished,
3823 and we're ready for input). */
3824 if (interpreter_async
&& was_sync
&& !sync_execution
)
3825 observer_notify_sync_execution_done ();
3829 && exec_done_display_p
3830 && (ptid_equal (inferior_ptid
, null_ptid
)
3831 || !is_running (inferior_ptid
)))
3832 printf_unfiltered (_("completed.\n"));
3835 /* Record the frame and location we're currently stepping through. */
3837 set_step_info (struct frame_info
*frame
, struct symtab_and_line sal
)
3839 struct thread_info
*tp
= inferior_thread ();
3841 tp
->control
.step_frame_id
= get_frame_id (frame
);
3842 tp
->control
.step_stack_frame_id
= get_stack_frame_id (frame
);
3844 tp
->current_symtab
= sal
.symtab
;
3845 tp
->current_line
= sal
.line
;
3848 /* Clear context switchable stepping state. */
3851 init_thread_stepping_state (struct thread_info
*tss
)
3853 tss
->stepped_breakpoint
= 0;
3854 tss
->stepping_over_breakpoint
= 0;
3855 tss
->stepping_over_watchpoint
= 0;
3856 tss
->step_after_step_resume_breakpoint
= 0;
3859 /* Set the cached copy of the last ptid/waitstatus. */
3862 set_last_target_status (ptid_t ptid
, struct target_waitstatus status
)
3864 target_last_wait_ptid
= ptid
;
3865 target_last_waitstatus
= status
;
3868 /* Return the cached copy of the last pid/waitstatus returned by
3869 target_wait()/deprecated_target_wait_hook(). The data is actually
3870 cached by handle_inferior_event(), which gets called immediately
3871 after target_wait()/deprecated_target_wait_hook(). */
3874 get_last_target_status (ptid_t
*ptidp
, struct target_waitstatus
*status
)
3876 *ptidp
= target_last_wait_ptid
;
3877 *status
= target_last_waitstatus
;
3881 nullify_last_target_wait_ptid (void)
3883 target_last_wait_ptid
= minus_one_ptid
;
3886 /* Switch thread contexts. */
3889 context_switch (ptid_t ptid
)
3891 if (debug_infrun
&& !ptid_equal (ptid
, inferior_ptid
))
3893 fprintf_unfiltered (gdb_stdlog
, "infrun: Switching context from %s ",
3894 target_pid_to_str (inferior_ptid
));
3895 fprintf_unfiltered (gdb_stdlog
, "to %s\n",
3896 target_pid_to_str (ptid
));
3899 switch_to_thread (ptid
);
3902 /* If the target can't tell whether we've hit breakpoints
3903 (target_supports_stopped_by_sw_breakpoint), and we got a SIGTRAP,
3904 check whether that could have been caused by a breakpoint. If so,
3905 adjust the PC, per gdbarch_decr_pc_after_break. */
3908 adjust_pc_after_break (struct thread_info
*thread
,
3909 struct target_waitstatus
*ws
)
3911 struct regcache
*regcache
;
3912 struct gdbarch
*gdbarch
;
3913 struct address_space
*aspace
;
3914 CORE_ADDR breakpoint_pc
, decr_pc
;
3916 /* If we've hit a breakpoint, we'll normally be stopped with SIGTRAP. If
3917 we aren't, just return.
3919 We assume that waitkinds other than TARGET_WAITKIND_STOPPED are not
3920 affected by gdbarch_decr_pc_after_break. Other waitkinds which are
3921 implemented by software breakpoints should be handled through the normal
3924 NOTE drow/2004-01-31: On some targets, breakpoints may generate
3925 different signals (SIGILL or SIGEMT for instance), but it is less
3926 clear where the PC is pointing afterwards. It may not match
3927 gdbarch_decr_pc_after_break. I don't know any specific target that
3928 generates these signals at breakpoints (the code has been in GDB since at
3929 least 1992) so I can not guess how to handle them here.
3931 In earlier versions of GDB, a target with
3932 gdbarch_have_nonsteppable_watchpoint would have the PC after hitting a
3933 watchpoint affected by gdbarch_decr_pc_after_break. I haven't found any
3934 target with both of these set in GDB history, and it seems unlikely to be
3935 correct, so gdbarch_have_nonsteppable_watchpoint is not checked here. */
3937 if (ws
->kind
!= TARGET_WAITKIND_STOPPED
)
3940 if (ws
->value
.sig
!= GDB_SIGNAL_TRAP
)
3943 /* In reverse execution, when a breakpoint is hit, the instruction
3944 under it has already been de-executed. The reported PC always
3945 points at the breakpoint address, so adjusting it further would
3946 be wrong. E.g., consider this case on a decr_pc_after_break == 1
3949 B1 0x08000000 : INSN1
3950 B2 0x08000001 : INSN2
3952 PC -> 0x08000003 : INSN4
3954 Say you're stopped at 0x08000003 as above. Reverse continuing
3955 from that point should hit B2 as below. Reading the PC when the
3956 SIGTRAP is reported should read 0x08000001 and INSN2 should have
3957 been de-executed already.
3959 B1 0x08000000 : INSN1
3960 B2 PC -> 0x08000001 : INSN2
3964 We can't apply the same logic as for forward execution, because
3965 we would wrongly adjust the PC to 0x08000000, since there's a
3966 breakpoint at PC - 1. We'd then report a hit on B1, although
3967 INSN1 hadn't been de-executed yet. Doing nothing is the correct
3969 if (execution_direction
== EXEC_REVERSE
)
3972 /* If the target can tell whether the thread hit a SW breakpoint,
3973 trust it. Targets that can tell also adjust the PC
3975 if (target_supports_stopped_by_sw_breakpoint ())
3978 /* Note that relying on whether a breakpoint is planted in memory to
3979 determine this can fail. E.g,. the breakpoint could have been
3980 removed since. Or the thread could have been told to step an
3981 instruction the size of a breakpoint instruction, and only
3982 _after_ was a breakpoint inserted at its address. */
3984 /* If this target does not decrement the PC after breakpoints, then
3985 we have nothing to do. */
3986 regcache
= get_thread_regcache (thread
->ptid
);
3987 gdbarch
= get_regcache_arch (regcache
);
3989 decr_pc
= gdbarch_decr_pc_after_break (gdbarch
);
3993 aspace
= get_regcache_aspace (regcache
);
3995 /* Find the location where (if we've hit a breakpoint) the
3996 breakpoint would be. */
3997 breakpoint_pc
= regcache_read_pc (regcache
) - decr_pc
;
3999 /* If the target can't tell whether a software breakpoint triggered,
4000 fallback to figuring it out based on breakpoints we think were
4001 inserted in the target, and on whether the thread was stepped or
4004 /* Check whether there actually is a software breakpoint inserted at
4007 If in non-stop mode, a race condition is possible where we've
4008 removed a breakpoint, but stop events for that breakpoint were
4009 already queued and arrive later. To suppress those spurious
4010 SIGTRAPs, we keep a list of such breakpoint locations for a bit,
4011 and retire them after a number of stop events are reported. Note
4012 this is an heuristic and can thus get confused. The real fix is
4013 to get the "stopped by SW BP and needs adjustment" info out of
4014 the target/kernel (and thus never reach here; see above). */
4015 if (software_breakpoint_inserted_here_p (aspace
, breakpoint_pc
)
4016 || (target_is_non_stop_p ()
4017 && moribund_breakpoint_here_p (aspace
, breakpoint_pc
)))
4019 struct cleanup
*old_cleanups
= make_cleanup (null_cleanup
, NULL
);
4021 if (record_full_is_used ())
4022 record_full_gdb_operation_disable_set ();
4024 /* When using hardware single-step, a SIGTRAP is reported for both
4025 a completed single-step and a software breakpoint. Need to
4026 differentiate between the two, as the latter needs adjusting
4027 but the former does not.
4029 The SIGTRAP can be due to a completed hardware single-step only if
4030 - we didn't insert software single-step breakpoints
4031 - this thread is currently being stepped
4033 If any of these events did not occur, we must have stopped due
4034 to hitting a software breakpoint, and have to back up to the
4037 As a special case, we could have hardware single-stepped a
4038 software breakpoint. In this case (prev_pc == breakpoint_pc),
4039 we also need to back up to the breakpoint address. */
4041 if (thread_has_single_step_breakpoints_set (thread
)
4042 || !currently_stepping (thread
)
4043 || (thread
->stepped_breakpoint
4044 && thread
->prev_pc
== breakpoint_pc
))
4045 regcache_write_pc (regcache
, breakpoint_pc
);
4047 do_cleanups (old_cleanups
);
4052 stepped_in_from (struct frame_info
*frame
, struct frame_id step_frame_id
)
4054 for (frame
= get_prev_frame (frame
);
4056 frame
= get_prev_frame (frame
))
4058 if (frame_id_eq (get_frame_id (frame
), step_frame_id
))
4060 if (get_frame_type (frame
) != INLINE_FRAME
)
4067 /* Auxiliary function that handles syscall entry/return events.
4068 It returns 1 if the inferior should keep going (and GDB
4069 should ignore the event), or 0 if the event deserves to be
4073 handle_syscall_event (struct execution_control_state
*ecs
)
4075 struct regcache
*regcache
;
4078 if (!ptid_equal (ecs
->ptid
, inferior_ptid
))
4079 context_switch (ecs
->ptid
);
4081 regcache
= get_thread_regcache (ecs
->ptid
);
4082 syscall_number
= ecs
->ws
.value
.syscall_number
;
4083 stop_pc
= regcache_read_pc (regcache
);
4085 if (catch_syscall_enabled () > 0
4086 && catching_syscall_number (syscall_number
) > 0)
4089 fprintf_unfiltered (gdb_stdlog
, "infrun: syscall number = '%d'\n",
4092 ecs
->event_thread
->control
.stop_bpstat
4093 = bpstat_stop_status (get_regcache_aspace (regcache
),
4094 stop_pc
, ecs
->ptid
, &ecs
->ws
);
4096 if (bpstat_causes_stop (ecs
->event_thread
->control
.stop_bpstat
))
4098 /* Catchpoint hit. */
4103 /* If no catchpoint triggered for this, then keep going. */
4108 /* Lazily fill in the execution_control_state's stop_func_* fields. */
4111 fill_in_stop_func (struct gdbarch
*gdbarch
,
4112 struct execution_control_state
*ecs
)
4114 if (!ecs
->stop_func_filled_in
)
4116 /* Don't care about return value; stop_func_start and stop_func_name
4117 will both be 0 if it doesn't work. */
4118 find_pc_partial_function (stop_pc
, &ecs
->stop_func_name
,
4119 &ecs
->stop_func_start
, &ecs
->stop_func_end
);
4120 ecs
->stop_func_start
4121 += gdbarch_deprecated_function_start_offset (gdbarch
);
4123 if (gdbarch_skip_entrypoint_p (gdbarch
))
4124 ecs
->stop_func_start
= gdbarch_skip_entrypoint (gdbarch
,
4125 ecs
->stop_func_start
);
4127 ecs
->stop_func_filled_in
= 1;
4132 /* Return the STOP_SOON field of the inferior pointed at by PTID. */
4134 static enum stop_kind
4135 get_inferior_stop_soon (ptid_t ptid
)
4137 struct inferior
*inf
= find_inferior_ptid (ptid
);
4139 gdb_assert (inf
!= NULL
);
4140 return inf
->control
.stop_soon
;
4143 /* Wait for one event. Store the resulting waitstatus in WS, and
4144 return the event ptid. */
4147 wait_one (struct target_waitstatus
*ws
)
4150 ptid_t wait_ptid
= minus_one_ptid
;
4152 overlay_cache_invalid
= 1;
4154 /* Flush target cache before starting to handle each event.
4155 Target was running and cache could be stale. This is just a
4156 heuristic. Running threads may modify target memory, but we
4157 don't get any event. */
4158 target_dcache_invalidate ();
4160 if (deprecated_target_wait_hook
)
4161 event_ptid
= deprecated_target_wait_hook (wait_ptid
, ws
, 0);
4163 event_ptid
= target_wait (wait_ptid
, ws
, 0);
4166 print_target_wait_results (wait_ptid
, event_ptid
, ws
);
4171 /* Generate a wrapper for target_stopped_by_REASON that works on PTID
4172 instead of the current thread. */
4173 #define THREAD_STOPPED_BY(REASON) \
4175 thread_stopped_by_ ## REASON (ptid_t ptid) \
4177 struct cleanup *old_chain; \
4180 old_chain = save_inferior_ptid (); \
4181 inferior_ptid = ptid; \
4183 res = target_stopped_by_ ## REASON (); \
4185 do_cleanups (old_chain); \
4190 /* Generate thread_stopped_by_watchpoint. */
4191 THREAD_STOPPED_BY (watchpoint
)
4192 /* Generate thread_stopped_by_sw_breakpoint. */
4193 THREAD_STOPPED_BY (sw_breakpoint
)
4194 /* Generate thread_stopped_by_hw_breakpoint. */
4195 THREAD_STOPPED_BY (hw_breakpoint
)
4197 /* Cleanups that switches to the PTID pointed at by PTID_P. */
4200 switch_to_thread_cleanup (void *ptid_p
)
4202 ptid_t ptid
= *(ptid_t
*) ptid_p
;
4204 switch_to_thread (ptid
);
4207 /* Save the thread's event and stop reason to process it later. */
4210 save_waitstatus (struct thread_info
*tp
, struct target_waitstatus
*ws
)
4212 struct regcache
*regcache
;
4213 struct address_space
*aspace
;
4219 statstr
= target_waitstatus_to_string (ws
);
4220 fprintf_unfiltered (gdb_stdlog
,
4221 "infrun: saving status %s for %d.%ld.%ld\n",
4223 ptid_get_pid (tp
->ptid
),
4224 ptid_get_lwp (tp
->ptid
),
4225 ptid_get_tid (tp
->ptid
));
4229 /* Record for later. */
4230 tp
->suspend
.waitstatus
= *ws
;
4231 tp
->suspend
.waitstatus_pending_p
= 1;
4233 regcache
= get_thread_regcache (tp
->ptid
);
4234 aspace
= get_regcache_aspace (regcache
);
4236 if (ws
->kind
== TARGET_WAITKIND_STOPPED
4237 && ws
->value
.sig
== GDB_SIGNAL_TRAP
)
4239 CORE_ADDR pc
= regcache_read_pc (regcache
);
4241 adjust_pc_after_break (tp
, &tp
->suspend
.waitstatus
);
4243 if (thread_stopped_by_watchpoint (tp
->ptid
))
4245 tp
->suspend
.stop_reason
4246 = TARGET_STOPPED_BY_WATCHPOINT
;
4248 else if (target_supports_stopped_by_sw_breakpoint ()
4249 && thread_stopped_by_sw_breakpoint (tp
->ptid
))
4251 tp
->suspend
.stop_reason
4252 = TARGET_STOPPED_BY_SW_BREAKPOINT
;
4254 else if (target_supports_stopped_by_hw_breakpoint ()
4255 && thread_stopped_by_hw_breakpoint (tp
->ptid
))
4257 tp
->suspend
.stop_reason
4258 = TARGET_STOPPED_BY_HW_BREAKPOINT
;
4260 else if (!target_supports_stopped_by_hw_breakpoint ()
4261 && hardware_breakpoint_inserted_here_p (aspace
,
4264 tp
->suspend
.stop_reason
4265 = TARGET_STOPPED_BY_HW_BREAKPOINT
;
4267 else if (!target_supports_stopped_by_sw_breakpoint ()
4268 && software_breakpoint_inserted_here_p (aspace
,
4271 tp
->suspend
.stop_reason
4272 = TARGET_STOPPED_BY_SW_BREAKPOINT
;
4274 else if (!thread_has_single_step_breakpoints_set (tp
)
4275 && currently_stepping (tp
))
4277 tp
->suspend
.stop_reason
4278 = TARGET_STOPPED_BY_SINGLE_STEP
;
4283 /* Stop all threads. */
4286 stop_all_threads (void)
4288 /* We may need multiple passes to discover all threads. */
4292 struct cleanup
*old_chain
;
4294 gdb_assert (target_is_non_stop_p ());
4297 fprintf_unfiltered (gdb_stdlog
, "infrun: stop_all_threads\n");
4299 entry_ptid
= inferior_ptid
;
4300 old_chain
= make_cleanup (switch_to_thread_cleanup
, &entry_ptid
);
4302 /* Request threads to stop, and then wait for the stops. Because
4303 threads we already know about can spawn more threads while we're
4304 trying to stop them, and we only learn about new threads when we
4305 update the thread list, do this in a loop, and keep iterating
4306 until two passes find no threads that need to be stopped. */
4307 for (pass
= 0; pass
< 2; pass
++, iterations
++)
4310 fprintf_unfiltered (gdb_stdlog
,
4311 "infrun: stop_all_threads, pass=%d, "
4312 "iterations=%d\n", pass
, iterations
);
4316 struct target_waitstatus ws
;
4318 struct thread_info
*t
;
4320 update_thread_list ();
4322 /* Go through all threads looking for threads that we need
4323 to tell the target to stop. */
4324 ALL_NON_EXITED_THREADS (t
)
4328 /* If already stopping, don't request a stop again.
4329 We just haven't seen the notification yet. */
4330 if (!t
->stop_requested
)
4333 fprintf_unfiltered (gdb_stdlog
,
4334 "infrun: %s executing, "
4336 target_pid_to_str (t
->ptid
));
4337 target_stop (t
->ptid
);
4338 t
->stop_requested
= 1;
4343 fprintf_unfiltered (gdb_stdlog
,
4344 "infrun: %s executing, "
4345 "already stopping\n",
4346 target_pid_to_str (t
->ptid
));
4349 if (t
->stop_requested
)
4355 fprintf_unfiltered (gdb_stdlog
,
4356 "infrun: %s not executing\n",
4357 target_pid_to_str (t
->ptid
));
4359 /* The thread may be not executing, but still be
4360 resumed with a pending status to process. */
4368 /* If we find new threads on the second iteration, restart
4369 over. We want to see two iterations in a row with all
4374 event_ptid
= wait_one (&ws
);
4375 if (ws
.kind
== TARGET_WAITKIND_NO_RESUMED
)
4377 /* All resumed threads exited. */
4379 else if (ws
.kind
== TARGET_WAITKIND_EXITED
4380 || ws
.kind
== TARGET_WAITKIND_SIGNALLED
)
4384 ptid_t ptid
= pid_to_ptid (ws
.value
.integer
);
4386 fprintf_unfiltered (gdb_stdlog
,
4387 "infrun: %s exited while "
4388 "stopping threads\n",
4389 target_pid_to_str (ptid
));
4394 t
= find_thread_ptid (event_ptid
);
4396 t
= add_thread (event_ptid
);
4398 t
->stop_requested
= 0;
4401 t
->control
.may_range_step
= 0;
4403 if (ws
.kind
== TARGET_WAITKIND_STOPPED
4404 && ws
.value
.sig
== GDB_SIGNAL_0
)
4406 /* We caught the event that we intended to catch, so
4407 there's no event pending. */
4408 t
->suspend
.waitstatus
.kind
= TARGET_WAITKIND_IGNORE
;
4409 t
->suspend
.waitstatus_pending_p
= 0;
4411 if (displaced_step_fixup (t
->ptid
, GDB_SIGNAL_0
) < 0)
4413 /* Add it back to the step-over queue. */
4416 fprintf_unfiltered (gdb_stdlog
,
4417 "infrun: displaced-step of %s "
4418 "canceled: adding back to the "
4419 "step-over queue\n",
4420 target_pid_to_str (t
->ptid
));
4422 t
->control
.trap_expected
= 0;
4423 thread_step_over_chain_enqueue (t
);
4428 enum gdb_signal sig
;
4429 struct regcache
*regcache
;
4430 struct address_space
*aspace
;
4436 statstr
= target_waitstatus_to_string (&ws
);
4437 fprintf_unfiltered (gdb_stdlog
,
4438 "infrun: target_wait %s, saving "
4439 "status for %d.%ld.%ld\n",
4441 ptid_get_pid (t
->ptid
),
4442 ptid_get_lwp (t
->ptid
),
4443 ptid_get_tid (t
->ptid
));
4447 /* Record for later. */
4448 save_waitstatus (t
, &ws
);
4450 sig
= (ws
.kind
== TARGET_WAITKIND_STOPPED
4451 ? ws
.value
.sig
: GDB_SIGNAL_0
);
4453 if (displaced_step_fixup (t
->ptid
, sig
) < 0)
4455 /* Add it back to the step-over queue. */
4456 t
->control
.trap_expected
= 0;
4457 thread_step_over_chain_enqueue (t
);
4460 regcache
= get_thread_regcache (t
->ptid
);
4461 t
->suspend
.stop_pc
= regcache_read_pc (regcache
);
4465 fprintf_unfiltered (gdb_stdlog
,
4466 "infrun: saved stop_pc=%s for %s "
4467 "(currently_stepping=%d)\n",
4468 paddress (target_gdbarch (),
4469 t
->suspend
.stop_pc
),
4470 target_pid_to_str (t
->ptid
),
4471 currently_stepping (t
));
4478 do_cleanups (old_chain
);
4481 fprintf_unfiltered (gdb_stdlog
, "infrun: stop_all_threads done\n");
4484 /* Given an execution control state that has been freshly filled in by
4485 an event from the inferior, figure out what it means and take
4488 The alternatives are:
4490 1) stop_waiting and return; to really stop and return to the
4493 2) keep_going and return; to wait for the next event (set
4494 ecs->event_thread->stepping_over_breakpoint to 1 to single step
4498 handle_inferior_event_1 (struct execution_control_state
*ecs
)
4500 enum stop_kind stop_soon
;
4502 if (ecs
->ws
.kind
== TARGET_WAITKIND_IGNORE
)
4504 /* We had an event in the inferior, but we are not interested in
4505 handling it at this level. The lower layers have already
4506 done what needs to be done, if anything.
4508 One of the possible circumstances for this is when the
4509 inferior produces output for the console. The inferior has
4510 not stopped, and we are ignoring the event. Another possible
4511 circumstance is any event which the lower level knows will be
4512 reported multiple times without an intervening resume. */
4514 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_IGNORE\n");
4515 prepare_to_wait (ecs
);
4519 if (ecs
->ws
.kind
== TARGET_WAITKIND_NO_RESUMED
4520 && target_can_async_p () && !sync_execution
)
4522 /* There were no unwaited-for children left in the target, but,
4523 we're not synchronously waiting for events either. Just
4524 ignore. Otherwise, if we were running a synchronous
4525 execution command, we need to cancel it and give the user
4526 back the terminal. */
4528 fprintf_unfiltered (gdb_stdlog
,
4529 "infrun: TARGET_WAITKIND_NO_RESUMED (ignoring)\n");
4530 prepare_to_wait (ecs
);
4534 /* Cache the last pid/waitstatus. */
4535 set_last_target_status (ecs
->ptid
, ecs
->ws
);
4537 /* Always clear state belonging to the previous time we stopped. */
4538 stop_stack_dummy
= STOP_NONE
;
4540 if (ecs
->ws
.kind
== TARGET_WAITKIND_NO_RESUMED
)
4542 /* No unwaited-for children left. IOW, all resumed children
4545 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_NO_RESUMED\n");
4547 stop_print_frame
= 0;
4552 if (ecs
->ws
.kind
!= TARGET_WAITKIND_EXITED
4553 && ecs
->ws
.kind
!= TARGET_WAITKIND_SIGNALLED
)
4555 ecs
->event_thread
= find_thread_ptid (ecs
->ptid
);
4556 /* If it's a new thread, add it to the thread database. */
4557 if (ecs
->event_thread
== NULL
)
4558 ecs
->event_thread
= add_thread (ecs
->ptid
);
4560 /* Disable range stepping. If the next step request could use a
4561 range, this will be end up re-enabled then. */
4562 ecs
->event_thread
->control
.may_range_step
= 0;
4565 /* Dependent on valid ECS->EVENT_THREAD. */
4566 adjust_pc_after_break (ecs
->event_thread
, &ecs
->ws
);
4568 /* Dependent on the current PC value modified by adjust_pc_after_break. */
4569 reinit_frame_cache ();
4571 breakpoint_retire_moribund ();
4573 /* First, distinguish signals caused by the debugger from signals
4574 that have to do with the program's own actions. Note that
4575 breakpoint insns may cause SIGTRAP or SIGILL or SIGEMT, depending
4576 on the operating system version. Here we detect when a SIGILL or
4577 SIGEMT is really a breakpoint and change it to SIGTRAP. We do
4578 something similar for SIGSEGV, since a SIGSEGV will be generated
4579 when we're trying to execute a breakpoint instruction on a
4580 non-executable stack. This happens for call dummy breakpoints
4581 for architectures like SPARC that place call dummies on the
4583 if (ecs
->ws
.kind
== TARGET_WAITKIND_STOPPED
4584 && (ecs
->ws
.value
.sig
== GDB_SIGNAL_ILL
4585 || ecs
->ws
.value
.sig
== GDB_SIGNAL_SEGV
4586 || ecs
->ws
.value
.sig
== GDB_SIGNAL_EMT
))
4588 struct regcache
*regcache
= get_thread_regcache (ecs
->ptid
);
4590 if (breakpoint_inserted_here_p (get_regcache_aspace (regcache
),
4591 regcache_read_pc (regcache
)))
4594 fprintf_unfiltered (gdb_stdlog
,
4595 "infrun: Treating signal as SIGTRAP\n");
4596 ecs
->ws
.value
.sig
= GDB_SIGNAL_TRAP
;
4600 /* Mark the non-executing threads accordingly. In all-stop, all
4601 threads of all processes are stopped when we get any event
4602 reported. In non-stop mode, only the event thread stops. */
4606 if (!target_is_non_stop_p ())
4607 mark_ptid
= minus_one_ptid
;
4608 else if (ecs
->ws
.kind
== TARGET_WAITKIND_SIGNALLED
4609 || ecs
->ws
.kind
== TARGET_WAITKIND_EXITED
)
4611 /* If we're handling a process exit in non-stop mode, even
4612 though threads haven't been deleted yet, one would think
4613 that there is nothing to do, as threads of the dead process
4614 will be soon deleted, and threads of any other process were
4615 left running. However, on some targets, threads survive a
4616 process exit event. E.g., for the "checkpoint" command,
4617 when the current checkpoint/fork exits, linux-fork.c
4618 automatically switches to another fork from within
4619 target_mourn_inferior, by associating the same
4620 inferior/thread to another fork. We haven't mourned yet at
4621 this point, but we must mark any threads left in the
4622 process as not-executing so that finish_thread_state marks
4623 them stopped (in the user's perspective) if/when we present
4624 the stop to the user. */
4625 mark_ptid
= pid_to_ptid (ptid_get_pid (ecs
->ptid
));
4628 mark_ptid
= ecs
->ptid
;
4630 set_executing (mark_ptid
, 0);
4632 /* Likewise the resumed flag. */
4633 set_resumed (mark_ptid
, 0);
4636 switch (ecs
->ws
.kind
)
4638 case TARGET_WAITKIND_LOADED
:
4640 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_LOADED\n");
4641 if (!ptid_equal (ecs
->ptid
, inferior_ptid
))
4642 context_switch (ecs
->ptid
);
4643 /* Ignore gracefully during startup of the inferior, as it might
4644 be the shell which has just loaded some objects, otherwise
4645 add the symbols for the newly loaded objects. Also ignore at
4646 the beginning of an attach or remote session; we will query
4647 the full list of libraries once the connection is
4650 stop_soon
= get_inferior_stop_soon (ecs
->ptid
);
4651 if (stop_soon
== NO_STOP_QUIETLY
)
4653 struct regcache
*regcache
;
4655 regcache
= get_thread_regcache (ecs
->ptid
);
4657 handle_solib_event ();
4659 ecs
->event_thread
->control
.stop_bpstat
4660 = bpstat_stop_status (get_regcache_aspace (regcache
),
4661 stop_pc
, ecs
->ptid
, &ecs
->ws
);
4663 if (bpstat_causes_stop (ecs
->event_thread
->control
.stop_bpstat
))
4665 /* A catchpoint triggered. */
4666 process_event_stop_test (ecs
);
4670 /* If requested, stop when the dynamic linker notifies
4671 gdb of events. This allows the user to get control
4672 and place breakpoints in initializer routines for
4673 dynamically loaded objects (among other things). */
4674 ecs
->event_thread
->suspend
.stop_signal
= GDB_SIGNAL_0
;
4675 if (stop_on_solib_events
)
4677 /* Make sure we print "Stopped due to solib-event" in
4679 stop_print_frame
= 1;
4686 /* If we are skipping through a shell, or through shared library
4687 loading that we aren't interested in, resume the program. If
4688 we're running the program normally, also resume. */
4689 if (stop_soon
== STOP_QUIETLY
|| stop_soon
== NO_STOP_QUIETLY
)
4691 /* Loading of shared libraries might have changed breakpoint
4692 addresses. Make sure new breakpoints are inserted. */
4693 if (stop_soon
== NO_STOP_QUIETLY
)
4694 insert_breakpoints ();
4695 resume (GDB_SIGNAL_0
);
4696 prepare_to_wait (ecs
);
4700 /* But stop if we're attaching or setting up a remote
4702 if (stop_soon
== STOP_QUIETLY_NO_SIGSTOP
4703 || stop_soon
== STOP_QUIETLY_REMOTE
)
4706 fprintf_unfiltered (gdb_stdlog
, "infrun: quietly stopped\n");
4711 internal_error (__FILE__
, __LINE__
,
4712 _("unhandled stop_soon: %d"), (int) stop_soon
);
4714 case TARGET_WAITKIND_SPURIOUS
:
4716 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_SPURIOUS\n");
4717 if (!ptid_equal (ecs
->ptid
, inferior_ptid
))
4718 context_switch (ecs
->ptid
);
4719 resume (GDB_SIGNAL_0
);
4720 prepare_to_wait (ecs
);
4723 case TARGET_WAITKIND_EXITED
:
4724 case TARGET_WAITKIND_SIGNALLED
:
4727 if (ecs
->ws
.kind
== TARGET_WAITKIND_EXITED
)
4728 fprintf_unfiltered (gdb_stdlog
,
4729 "infrun: TARGET_WAITKIND_EXITED\n");
4731 fprintf_unfiltered (gdb_stdlog
,
4732 "infrun: TARGET_WAITKIND_SIGNALLED\n");
4735 inferior_ptid
= ecs
->ptid
;
4736 set_current_inferior (find_inferior_ptid (ecs
->ptid
));
4737 set_current_program_space (current_inferior ()->pspace
);
4738 handle_vfork_child_exec_or_exit (0);
4739 target_terminal_ours (); /* Must do this before mourn anyway. */
4741 /* Clearing any previous state of convenience variables. */
4742 clear_exit_convenience_vars ();
4744 if (ecs
->ws
.kind
== TARGET_WAITKIND_EXITED
)
4746 /* Record the exit code in the convenience variable $_exitcode, so
4747 that the user can inspect this again later. */
4748 set_internalvar_integer (lookup_internalvar ("_exitcode"),
4749 (LONGEST
) ecs
->ws
.value
.integer
);
4751 /* Also record this in the inferior itself. */
4752 current_inferior ()->has_exit_code
= 1;
4753 current_inferior ()->exit_code
= (LONGEST
) ecs
->ws
.value
.integer
;
4755 /* Support the --return-child-result option. */
4756 return_child_result_value
= ecs
->ws
.value
.integer
;
4758 observer_notify_exited (ecs
->ws
.value
.integer
);
4762 struct regcache
*regcache
= get_thread_regcache (ecs
->ptid
);
4763 struct gdbarch
*gdbarch
= get_regcache_arch (regcache
);
4765 if (gdbarch_gdb_signal_to_target_p (gdbarch
))
4767 /* Set the value of the internal variable $_exitsignal,
4768 which holds the signal uncaught by the inferior. */
4769 set_internalvar_integer (lookup_internalvar ("_exitsignal"),
4770 gdbarch_gdb_signal_to_target (gdbarch
,
4771 ecs
->ws
.value
.sig
));
4775 /* We don't have access to the target's method used for
4776 converting between signal numbers (GDB's internal
4777 representation <-> target's representation).
4778 Therefore, we cannot do a good job at displaying this
4779 information to the user. It's better to just warn
4780 her about it (if infrun debugging is enabled), and
4783 fprintf_filtered (gdb_stdlog
, _("\
4784 Cannot fill $_exitsignal with the correct signal number.\n"));
4787 observer_notify_signal_exited (ecs
->ws
.value
.sig
);
4790 gdb_flush (gdb_stdout
);
4791 target_mourn_inferior ();
4792 stop_print_frame
= 0;
4796 /* The following are the only cases in which we keep going;
4797 the above cases end in a continue or goto. */
4798 case TARGET_WAITKIND_FORKED
:
4799 case TARGET_WAITKIND_VFORKED
:
4802 if (ecs
->ws
.kind
== TARGET_WAITKIND_FORKED
)
4803 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_FORKED\n");
4805 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_VFORKED\n");
4808 /* Check whether the inferior is displaced stepping. */
4810 struct regcache
*regcache
= get_thread_regcache (ecs
->ptid
);
4811 struct gdbarch
*gdbarch
= get_regcache_arch (regcache
);
4812 struct displaced_step_inferior_state
*displaced
4813 = get_displaced_stepping_state (ptid_get_pid (ecs
->ptid
));
4815 /* If checking displaced stepping is supported, and thread
4816 ecs->ptid is displaced stepping. */
4817 if (displaced
&& ptid_equal (displaced
->step_ptid
, ecs
->ptid
))
4819 struct inferior
*parent_inf
4820 = find_inferior_ptid (ecs
->ptid
);
4821 struct regcache
*child_regcache
;
4822 CORE_ADDR parent_pc
;
4824 /* GDB has got TARGET_WAITKIND_FORKED or TARGET_WAITKIND_VFORKED,
4825 indicating that the displaced stepping of syscall instruction
4826 has been done. Perform cleanup for parent process here. Note
4827 that this operation also cleans up the child process for vfork,
4828 because their pages are shared. */
4829 displaced_step_fixup (ecs
->ptid
, GDB_SIGNAL_TRAP
);
4830 /* Start a new step-over in another thread if there's one
4834 if (ecs
->ws
.kind
== TARGET_WAITKIND_FORKED
)
4836 /* Restore scratch pad for child process. */
4837 displaced_step_restore (displaced
, ecs
->ws
.value
.related_pid
);
4840 /* Since the vfork/fork syscall instruction was executed in the scratchpad,
4841 the child's PC is also within the scratchpad. Set the child's PC
4842 to the parent's PC value, which has already been fixed up.
4843 FIXME: we use the parent's aspace here, although we're touching
4844 the child, because the child hasn't been added to the inferior
4845 list yet at this point. */
4848 = get_thread_arch_aspace_regcache (ecs
->ws
.value
.related_pid
,
4850 parent_inf
->aspace
);
4851 /* Read PC value of parent process. */
4852 parent_pc
= regcache_read_pc (regcache
);
4854 if (debug_displaced
)
4855 fprintf_unfiltered (gdb_stdlog
,
4856 "displaced: write child pc from %s to %s\n",
4858 regcache_read_pc (child_regcache
)),
4859 paddress (gdbarch
, parent_pc
));
4861 regcache_write_pc (child_regcache
, parent_pc
);
4865 if (!ptid_equal (ecs
->ptid
, inferior_ptid
))
4866 context_switch (ecs
->ptid
);
4868 /* Immediately detach breakpoints from the child before there's
4869 any chance of letting the user delete breakpoints from the
4870 breakpoint lists. If we don't do this early, it's easy to
4871 leave left over traps in the child, vis: "break foo; catch
4872 fork; c; <fork>; del; c; <child calls foo>". We only follow
4873 the fork on the last `continue', and by that time the
4874 breakpoint at "foo" is long gone from the breakpoint table.
4875 If we vforked, then we don't need to unpatch here, since both
4876 parent and child are sharing the same memory pages; we'll
4877 need to unpatch at follow/detach time instead to be certain
4878 that new breakpoints added between catchpoint hit time and
4879 vfork follow are detached. */
4880 if (ecs
->ws
.kind
!= TARGET_WAITKIND_VFORKED
)
4882 /* This won't actually modify the breakpoint list, but will
4883 physically remove the breakpoints from the child. */
4884 detach_breakpoints (ecs
->ws
.value
.related_pid
);
4887 delete_just_stopped_threads_single_step_breakpoints ();
4889 /* In case the event is caught by a catchpoint, remember that
4890 the event is to be followed at the next resume of the thread,
4891 and not immediately. */
4892 ecs
->event_thread
->pending_follow
= ecs
->ws
;
4894 stop_pc
= regcache_read_pc (get_thread_regcache (ecs
->ptid
));
4896 ecs
->event_thread
->control
.stop_bpstat
4897 = bpstat_stop_status (get_regcache_aspace (get_current_regcache ()),
4898 stop_pc
, ecs
->ptid
, &ecs
->ws
);
4900 /* If no catchpoint triggered for this, then keep going. Note
4901 that we're interested in knowing the bpstat actually causes a
4902 stop, not just if it may explain the signal. Software
4903 watchpoints, for example, always appear in the bpstat. */
4904 if (!bpstat_causes_stop (ecs
->event_thread
->control
.stop_bpstat
))
4910 = (follow_fork_mode_string
== follow_fork_mode_child
);
4912 ecs
->event_thread
->suspend
.stop_signal
= GDB_SIGNAL_0
;
4914 should_resume
= follow_fork ();
4917 child
= ecs
->ws
.value
.related_pid
;
4919 /* In non-stop mode, also resume the other branch. */
4920 if (!detach_fork
&& (non_stop
4921 || (sched_multi
&& target_is_non_stop_p ())))
4924 switch_to_thread (parent
);
4926 switch_to_thread (child
);
4928 ecs
->event_thread
= inferior_thread ();
4929 ecs
->ptid
= inferior_ptid
;
4934 switch_to_thread (child
);
4936 switch_to_thread (parent
);
4938 ecs
->event_thread
= inferior_thread ();
4939 ecs
->ptid
= inferior_ptid
;
4947 process_event_stop_test (ecs
);
4950 case TARGET_WAITKIND_VFORK_DONE
:
4951 /* Done with the shared memory region. Re-insert breakpoints in
4952 the parent, and keep going. */
4955 fprintf_unfiltered (gdb_stdlog
,
4956 "infrun: TARGET_WAITKIND_VFORK_DONE\n");
4958 if (!ptid_equal (ecs
->ptid
, inferior_ptid
))
4959 context_switch (ecs
->ptid
);
4961 current_inferior ()->waiting_for_vfork_done
= 0;
4962 current_inferior ()->pspace
->breakpoints_not_allowed
= 0;
4963 /* This also takes care of reinserting breakpoints in the
4964 previously locked inferior. */
4968 case TARGET_WAITKIND_EXECD
:
4970 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_EXECD\n");
4972 if (!ptid_equal (ecs
->ptid
, inferior_ptid
))
4973 context_switch (ecs
->ptid
);
4975 stop_pc
= regcache_read_pc (get_thread_regcache (ecs
->ptid
));
4977 /* Do whatever is necessary to the parent branch of the vfork. */
4978 handle_vfork_child_exec_or_exit (1);
4980 /* This causes the eventpoints and symbol table to be reset.
4981 Must do this now, before trying to determine whether to
4983 follow_exec (inferior_ptid
, ecs
->ws
.value
.execd_pathname
);
4985 /* In follow_exec we may have deleted the original thread and
4986 created a new one. Make sure that the event thread is the
4987 execd thread for that case (this is a nop otherwise). */
4988 ecs
->event_thread
= inferior_thread ();
4990 ecs
->event_thread
->control
.stop_bpstat
4991 = bpstat_stop_status (get_regcache_aspace (get_current_regcache ()),
4992 stop_pc
, ecs
->ptid
, &ecs
->ws
);
4994 /* Note that this may be referenced from inside
4995 bpstat_stop_status above, through inferior_has_execd. */
4996 xfree (ecs
->ws
.value
.execd_pathname
);
4997 ecs
->ws
.value
.execd_pathname
= NULL
;
4999 /* If no catchpoint triggered for this, then keep going. */
5000 if (!bpstat_causes_stop (ecs
->event_thread
->control
.stop_bpstat
))
5002 ecs
->event_thread
->suspend
.stop_signal
= GDB_SIGNAL_0
;
5006 process_event_stop_test (ecs
);
5009 /* Be careful not to try to gather much state about a thread
5010 that's in a syscall. It's frequently a losing proposition. */
5011 case TARGET_WAITKIND_SYSCALL_ENTRY
:
5013 fprintf_unfiltered (gdb_stdlog
,
5014 "infrun: TARGET_WAITKIND_SYSCALL_ENTRY\n");
5015 /* Getting the current syscall number. */
5016 if (handle_syscall_event (ecs
) == 0)
5017 process_event_stop_test (ecs
);
5020 /* Before examining the threads further, step this thread to
5021 get it entirely out of the syscall. (We get notice of the
5022 event when the thread is just on the verge of exiting a
5023 syscall. Stepping one instruction seems to get it back
5025 case TARGET_WAITKIND_SYSCALL_RETURN
:
5027 fprintf_unfiltered (gdb_stdlog
,
5028 "infrun: TARGET_WAITKIND_SYSCALL_RETURN\n");
5029 if (handle_syscall_event (ecs
) == 0)
5030 process_event_stop_test (ecs
);
5033 case TARGET_WAITKIND_STOPPED
:
5035 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_STOPPED\n");
5036 ecs
->event_thread
->suspend
.stop_signal
= ecs
->ws
.value
.sig
;
5037 handle_signal_stop (ecs
);
5040 case TARGET_WAITKIND_NO_HISTORY
:
5042 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_NO_HISTORY\n");
5043 /* Reverse execution: target ran out of history info. */
5045 delete_just_stopped_threads_single_step_breakpoints ();
5046 stop_pc
= regcache_read_pc (get_thread_regcache (ecs
->ptid
));
5047 observer_notify_no_history ();
5053 /* A wrapper around handle_inferior_event_1, which also makes sure
5054 that all temporary struct value objects that were created during
5055 the handling of the event get deleted at the end. */
5058 handle_inferior_event (struct execution_control_state
*ecs
)
5060 struct value
*mark
= value_mark ();
5062 handle_inferior_event_1 (ecs
);
5063 /* Purge all temporary values created during the event handling,
5064 as it could be a long time before we return to the command level
5065 where such values would otherwise be purged. */
5066 value_free_to_mark (mark
);
5069 /* Restart threads back to what they were trying to do back when we
5070 paused them for an in-line step-over. The EVENT_THREAD thread is
5074 restart_threads (struct thread_info
*event_thread
)
5076 struct thread_info
*tp
;
5077 struct thread_info
*step_over
= NULL
;
5079 /* In case the instruction just stepped spawned a new thread. */
5080 update_thread_list ();
5082 ALL_NON_EXITED_THREADS (tp
)
5084 if (tp
== event_thread
)
5087 fprintf_unfiltered (gdb_stdlog
,
5088 "infrun: restart threads: "
5089 "[%s] is event thread\n",
5090 target_pid_to_str (tp
->ptid
));
5094 if (!(tp
->state
== THREAD_RUNNING
|| tp
->control
.in_infcall
))
5097 fprintf_unfiltered (gdb_stdlog
,
5098 "infrun: restart threads: "
5099 "[%s] not meant to be running\n",
5100 target_pid_to_str (tp
->ptid
));
5107 fprintf_unfiltered (gdb_stdlog
,
5108 "infrun: restart threads: [%s] resumed\n",
5109 target_pid_to_str (tp
->ptid
));
5110 gdb_assert (tp
->executing
|| tp
->suspend
.waitstatus_pending_p
);
5114 if (thread_is_in_step_over_chain (tp
))
5117 fprintf_unfiltered (gdb_stdlog
,
5118 "infrun: restart threads: "
5119 "[%s] needs step-over\n",
5120 target_pid_to_str (tp
->ptid
));
5121 gdb_assert (!tp
->resumed
);
5126 if (tp
->suspend
.waitstatus_pending_p
)
5129 fprintf_unfiltered (gdb_stdlog
,
5130 "infrun: restart threads: "
5131 "[%s] has pending status\n",
5132 target_pid_to_str (tp
->ptid
));
5137 /* If some thread needs to start a step-over at this point, it
5138 should still be in the step-over queue, and thus skipped
5140 if (thread_still_needs_step_over (tp
))
5142 internal_error (__FILE__
, __LINE__
,
5143 "thread [%s] needs a step-over, but not in "
5144 "step-over queue\n",
5145 target_pid_to_str (tp
->ptid
));
5148 if (currently_stepping (tp
))
5151 fprintf_unfiltered (gdb_stdlog
,
5152 "infrun: restart threads: [%s] was stepping\n",
5153 target_pid_to_str (tp
->ptid
));
5154 keep_going_stepped_thread (tp
);
5158 struct execution_control_state ecss
;
5159 struct execution_control_state
*ecs
= &ecss
;
5162 fprintf_unfiltered (gdb_stdlog
,
5163 "infrun: restart threads: [%s] continuing\n",
5164 target_pid_to_str (tp
->ptid
));
5165 reset_ecs (ecs
, tp
);
5166 switch_to_thread (tp
->ptid
);
5167 keep_going_pass_signal (ecs
);
5172 /* Callback for iterate_over_threads. Find a resumed thread that has
5173 a pending waitstatus. */
5176 resumed_thread_with_pending_status (struct thread_info
*tp
,
5180 && tp
->suspend
.waitstatus_pending_p
);
5183 /* Called when we get an event that may finish an in-line or
5184 out-of-line (displaced stepping) step-over started previously.
5185 Return true if the event is processed and we should go back to the
5186 event loop; false if the caller should continue processing the
5190 finish_step_over (struct execution_control_state
*ecs
)
5192 int had_step_over_info
;
5194 displaced_step_fixup (ecs
->ptid
,
5195 ecs
->event_thread
->suspend
.stop_signal
);
5197 had_step_over_info
= step_over_info_valid_p ();
5199 if (had_step_over_info
)
5201 /* If we're stepping over a breakpoint with all threads locked,
5202 then only the thread that was stepped should be reporting
5204 gdb_assert (ecs
->event_thread
->control
.trap_expected
);
5206 if (ecs
->event_thread
->suspend
.stop_signal
== GDB_SIGNAL_TRAP
)
5207 clear_step_over_info ();
5210 if (!target_is_non_stop_p ())
5213 /* Start a new step-over in another thread if there's one that
5217 /* If we were stepping over a breakpoint before, and haven't started
5218 a new in-line step-over sequence, then restart all other threads
5219 (except the event thread). We can't do this in all-stop, as then
5220 e.g., we wouldn't be able to issue any other remote packet until
5221 these other threads stop. */
5222 if (had_step_over_info
&& !step_over_info_valid_p ())
5224 struct thread_info
*pending
;
5226 /* If we only have threads with pending statuses, the restart
5227 below won't restart any thread and so nothing re-inserts the
5228 breakpoint we just stepped over. But we need it inserted
5229 when we later process the pending events, otherwise if
5230 another thread has a pending event for this breakpoint too,
5231 we'd discard its event (because the breakpoint that
5232 originally caused the event was no longer inserted). */
5233 context_switch (ecs
->ptid
);
5234 insert_breakpoints ();
5236 restart_threads (ecs
->event_thread
);
5238 /* If we have events pending, go through handle_inferior_event
5239 again, picking up a pending event at random. This avoids
5240 thread starvation. */
5242 /* But not if we just stepped over a watchpoint in order to let
5243 the instruction execute so we can evaluate its expression.
5244 The set of watchpoints that triggered is recorded in the
5245 breakpoint objects themselves (see bp->watchpoint_triggered).
5246 If we processed another event first, that other event could
5247 clobber this info. */
5248 if (ecs
->event_thread
->stepping_over_watchpoint
)
5251 pending
= iterate_over_threads (resumed_thread_with_pending_status
,
5253 if (pending
!= NULL
)
5255 struct thread_info
*tp
= ecs
->event_thread
;
5256 struct regcache
*regcache
;
5260 fprintf_unfiltered (gdb_stdlog
,
5261 "infrun: found resumed threads with "
5262 "pending events, saving status\n");
5265 gdb_assert (pending
!= tp
);
5267 /* Record the event thread's event for later. */
5268 save_waitstatus (tp
, &ecs
->ws
);
5269 /* This was cleared early, by handle_inferior_event. Set it
5270 so this pending event is considered by
5274 gdb_assert (!tp
->executing
);
5276 regcache
= get_thread_regcache (tp
->ptid
);
5277 tp
->suspend
.stop_pc
= regcache_read_pc (regcache
);
5281 fprintf_unfiltered (gdb_stdlog
,
5282 "infrun: saved stop_pc=%s for %s "
5283 "(currently_stepping=%d)\n",
5284 paddress (target_gdbarch (),
5285 tp
->suspend
.stop_pc
),
5286 target_pid_to_str (tp
->ptid
),
5287 currently_stepping (tp
));
5290 /* This in-line step-over finished; clear this so we won't
5291 start a new one. This is what handle_signal_stop would
5292 do, if we returned false. */
5293 tp
->stepping_over_breakpoint
= 0;
5295 /* Wake up the event loop again. */
5296 mark_async_event_handler (infrun_async_inferior_event_token
);
5298 prepare_to_wait (ecs
);
5306 /* Come here when the program has stopped with a signal. */
5309 handle_signal_stop (struct execution_control_state
*ecs
)
5311 struct frame_info
*frame
;
5312 struct gdbarch
*gdbarch
;
5313 int stopped_by_watchpoint
;
5314 enum stop_kind stop_soon
;
5317 gdb_assert (ecs
->ws
.kind
== TARGET_WAITKIND_STOPPED
);
5319 /* Do we need to clean up the state of a thread that has
5320 completed a displaced single-step? (Doing so usually affects
5321 the PC, so do it here, before we set stop_pc.) */
5322 if (finish_step_over (ecs
))
5325 /* If we either finished a single-step or hit a breakpoint, but
5326 the user wanted this thread to be stopped, pretend we got a
5327 SIG0 (generic unsignaled stop). */
5328 if (ecs
->event_thread
->stop_requested
5329 && ecs
->event_thread
->suspend
.stop_signal
== GDB_SIGNAL_TRAP
)
5330 ecs
->event_thread
->suspend
.stop_signal
= GDB_SIGNAL_0
;
5332 stop_pc
= regcache_read_pc (get_thread_regcache (ecs
->ptid
));
5336 struct regcache
*regcache
= get_thread_regcache (ecs
->ptid
);
5337 struct gdbarch
*gdbarch
= get_regcache_arch (regcache
);
5338 struct cleanup
*old_chain
= save_inferior_ptid ();
5340 inferior_ptid
= ecs
->ptid
;
5342 fprintf_unfiltered (gdb_stdlog
, "infrun: stop_pc = %s\n",
5343 paddress (gdbarch
, stop_pc
));
5344 if (target_stopped_by_watchpoint ())
5348 fprintf_unfiltered (gdb_stdlog
, "infrun: stopped by watchpoint\n");
5350 if (target_stopped_data_address (¤t_target
, &addr
))
5351 fprintf_unfiltered (gdb_stdlog
,
5352 "infrun: stopped data address = %s\n",
5353 paddress (gdbarch
, addr
));
5355 fprintf_unfiltered (gdb_stdlog
,
5356 "infrun: (no data address available)\n");
5359 do_cleanups (old_chain
);
5362 /* This is originated from start_remote(), start_inferior() and
5363 shared libraries hook functions. */
5364 stop_soon
= get_inferior_stop_soon (ecs
->ptid
);
5365 if (stop_soon
== STOP_QUIETLY
|| stop_soon
== STOP_QUIETLY_REMOTE
)
5367 if (!ptid_equal (ecs
->ptid
, inferior_ptid
))
5368 context_switch (ecs
->ptid
);
5370 fprintf_unfiltered (gdb_stdlog
, "infrun: quietly stopped\n");
5371 stop_print_frame
= 1;
5376 if (ecs
->event_thread
->suspend
.stop_signal
== GDB_SIGNAL_TRAP
5379 if (!ptid_equal (ecs
->ptid
, inferior_ptid
))
5380 context_switch (ecs
->ptid
);
5382 fprintf_unfiltered (gdb_stdlog
, "infrun: stopped\n");
5383 stop_print_frame
= 0;
5388 /* This originates from attach_command(). We need to overwrite
5389 the stop_signal here, because some kernels don't ignore a
5390 SIGSTOP in a subsequent ptrace(PTRACE_CONT,SIGSTOP) call.
5391 See more comments in inferior.h. On the other hand, if we
5392 get a non-SIGSTOP, report it to the user - assume the backend
5393 will handle the SIGSTOP if it should show up later.
5395 Also consider that the attach is complete when we see a
5396 SIGTRAP. Some systems (e.g. Windows), and stubs supporting
5397 target extended-remote report it instead of a SIGSTOP
5398 (e.g. gdbserver). We already rely on SIGTRAP being our
5399 signal, so this is no exception.
5401 Also consider that the attach is complete when we see a
5402 GDB_SIGNAL_0. In non-stop mode, GDB will explicitly tell
5403 the target to stop all threads of the inferior, in case the
5404 low level attach operation doesn't stop them implicitly. If
5405 they weren't stopped implicitly, then the stub will report a
5406 GDB_SIGNAL_0, meaning: stopped for no particular reason
5407 other than GDB's request. */
5408 if (stop_soon
== STOP_QUIETLY_NO_SIGSTOP
5409 && (ecs
->event_thread
->suspend
.stop_signal
== GDB_SIGNAL_STOP
5410 || ecs
->event_thread
->suspend
.stop_signal
== GDB_SIGNAL_TRAP
5411 || ecs
->event_thread
->suspend
.stop_signal
== GDB_SIGNAL_0
))
5413 stop_print_frame
= 1;
5415 ecs
->event_thread
->suspend
.stop_signal
= GDB_SIGNAL_0
;
5419 /* See if something interesting happened to the non-current thread. If
5420 so, then switch to that thread. */
5421 if (!ptid_equal (ecs
->ptid
, inferior_ptid
))
5424 fprintf_unfiltered (gdb_stdlog
, "infrun: context switch\n");
5426 context_switch (ecs
->ptid
);
5428 if (deprecated_context_hook
)
5429 deprecated_context_hook (pid_to_thread_id (ecs
->ptid
));
5432 /* At this point, get hold of the now-current thread's frame. */
5433 frame
= get_current_frame ();
5434 gdbarch
= get_frame_arch (frame
);
5436 /* Pull the single step breakpoints out of the target. */
5437 if (ecs
->event_thread
->suspend
.stop_signal
== GDB_SIGNAL_TRAP
)
5439 struct regcache
*regcache
;
5440 struct address_space
*aspace
;
5443 regcache
= get_thread_regcache (ecs
->ptid
);
5444 aspace
= get_regcache_aspace (regcache
);
5445 pc
= regcache_read_pc (regcache
);
5447 /* However, before doing so, if this single-step breakpoint was
5448 actually for another thread, set this thread up for moving
5450 if (!thread_has_single_step_breakpoint_here (ecs
->event_thread
,
5453 if (single_step_breakpoint_inserted_here_p (aspace
, pc
))
5457 fprintf_unfiltered (gdb_stdlog
,
5458 "infrun: [%s] hit another thread's "
5459 "single-step breakpoint\n",
5460 target_pid_to_str (ecs
->ptid
));
5462 ecs
->hit_singlestep_breakpoint
= 1;
5469 fprintf_unfiltered (gdb_stdlog
,
5470 "infrun: [%s] hit its "
5471 "single-step breakpoint\n",
5472 target_pid_to_str (ecs
->ptid
));
5476 delete_just_stopped_threads_single_step_breakpoints ();
5478 if (ecs
->event_thread
->suspend
.stop_signal
== GDB_SIGNAL_TRAP
5479 && ecs
->event_thread
->control
.trap_expected
5480 && ecs
->event_thread
->stepping_over_watchpoint
)
5481 stopped_by_watchpoint
= 0;
5483 stopped_by_watchpoint
= watchpoints_triggered (&ecs
->ws
);
5485 /* If necessary, step over this watchpoint. We'll be back to display
5487 if (stopped_by_watchpoint
5488 && (target_have_steppable_watchpoint
5489 || gdbarch_have_nonsteppable_watchpoint (gdbarch
)))
5491 /* At this point, we are stopped at an instruction which has
5492 attempted to write to a piece of memory under control of
5493 a watchpoint. The instruction hasn't actually executed
5494 yet. If we were to evaluate the watchpoint expression
5495 now, we would get the old value, and therefore no change
5496 would seem to have occurred.
5498 In order to make watchpoints work `right', we really need
5499 to complete the memory write, and then evaluate the
5500 watchpoint expression. We do this by single-stepping the
5503 It may not be necessary to disable the watchpoint to step over
5504 it. For example, the PA can (with some kernel cooperation)
5505 single step over a watchpoint without disabling the watchpoint.
5507 It is far more common to need to disable a watchpoint to step
5508 the inferior over it. If we have non-steppable watchpoints,
5509 we must disable the current watchpoint; it's simplest to
5510 disable all watchpoints.
5512 Any breakpoint at PC must also be stepped over -- if there's
5513 one, it will have already triggered before the watchpoint
5514 triggered, and we either already reported it to the user, or
5515 it didn't cause a stop and we called keep_going. In either
5516 case, if there was a breakpoint at PC, we must be trying to
5518 ecs
->event_thread
->stepping_over_watchpoint
= 1;
5523 ecs
->event_thread
->stepping_over_breakpoint
= 0;
5524 ecs
->event_thread
->stepping_over_watchpoint
= 0;
5525 bpstat_clear (&ecs
->event_thread
->control
.stop_bpstat
);
5526 ecs
->event_thread
->control
.stop_step
= 0;
5527 stop_print_frame
= 1;
5528 stopped_by_random_signal
= 0;
5530 /* Hide inlined functions starting here, unless we just performed stepi or
5531 nexti. After stepi and nexti, always show the innermost frame (not any
5532 inline function call sites). */
5533 if (ecs
->event_thread
->control
.step_range_end
!= 1)
5535 struct address_space
*aspace
=
5536 get_regcache_aspace (get_thread_regcache (ecs
->ptid
));
5538 /* skip_inline_frames is expensive, so we avoid it if we can
5539 determine that the address is one where functions cannot have
5540 been inlined. This improves performance with inferiors that
5541 load a lot of shared libraries, because the solib event
5542 breakpoint is defined as the address of a function (i.e. not
5543 inline). Note that we have to check the previous PC as well
5544 as the current one to catch cases when we have just
5545 single-stepped off a breakpoint prior to reinstating it.
5546 Note that we're assuming that the code we single-step to is
5547 not inline, but that's not definitive: there's nothing
5548 preventing the event breakpoint function from containing
5549 inlined code, and the single-step ending up there. If the
5550 user had set a breakpoint on that inlined code, the missing
5551 skip_inline_frames call would break things. Fortunately
5552 that's an extremely unlikely scenario. */
5553 if (!pc_at_non_inline_function (aspace
, stop_pc
, &ecs
->ws
)
5554 && !(ecs
->event_thread
->suspend
.stop_signal
== GDB_SIGNAL_TRAP
5555 && ecs
->event_thread
->control
.trap_expected
5556 && pc_at_non_inline_function (aspace
,
5557 ecs
->event_thread
->prev_pc
,
5560 skip_inline_frames (ecs
->ptid
);
5562 /* Re-fetch current thread's frame in case that invalidated
5564 frame
= get_current_frame ();
5565 gdbarch
= get_frame_arch (frame
);
5569 if (ecs
->event_thread
->suspend
.stop_signal
== GDB_SIGNAL_TRAP
5570 && ecs
->event_thread
->control
.trap_expected
5571 && gdbarch_single_step_through_delay_p (gdbarch
)
5572 && currently_stepping (ecs
->event_thread
))
5574 /* We're trying to step off a breakpoint. Turns out that we're
5575 also on an instruction that needs to be stepped multiple
5576 times before it's been fully executing. E.g., architectures
5577 with a delay slot. It needs to be stepped twice, once for
5578 the instruction and once for the delay slot. */
5579 int step_through_delay
5580 = gdbarch_single_step_through_delay (gdbarch
, frame
);
5582 if (debug_infrun
&& step_through_delay
)
5583 fprintf_unfiltered (gdb_stdlog
, "infrun: step through delay\n");
5584 if (ecs
->event_thread
->control
.step_range_end
== 0
5585 && step_through_delay
)
5587 /* The user issued a continue when stopped at a breakpoint.
5588 Set up for another trap and get out of here. */
5589 ecs
->event_thread
->stepping_over_breakpoint
= 1;
5593 else if (step_through_delay
)
5595 /* The user issued a step when stopped at a breakpoint.
5596 Maybe we should stop, maybe we should not - the delay
5597 slot *might* correspond to a line of source. In any
5598 case, don't decide that here, just set
5599 ecs->stepping_over_breakpoint, making sure we
5600 single-step again before breakpoints are re-inserted. */
5601 ecs
->event_thread
->stepping_over_breakpoint
= 1;
5605 /* See if there is a breakpoint/watchpoint/catchpoint/etc. that
5606 handles this event. */
5607 ecs
->event_thread
->control
.stop_bpstat
5608 = bpstat_stop_status (get_regcache_aspace (get_current_regcache ()),
5609 stop_pc
, ecs
->ptid
, &ecs
->ws
);
5611 /* Following in case break condition called a
5613 stop_print_frame
= 1;
5615 /* This is where we handle "moribund" watchpoints. Unlike
5616 software breakpoints traps, hardware watchpoint traps are
5617 always distinguishable from random traps. If no high-level
5618 watchpoint is associated with the reported stop data address
5619 anymore, then the bpstat does not explain the signal ---
5620 simply make sure to ignore it if `stopped_by_watchpoint' is
5624 && ecs
->event_thread
->suspend
.stop_signal
== GDB_SIGNAL_TRAP
5625 && !bpstat_explains_signal (ecs
->event_thread
->control
.stop_bpstat
,
5627 && stopped_by_watchpoint
)
5628 fprintf_unfiltered (gdb_stdlog
,
5629 "infrun: no user watchpoint explains "
5630 "watchpoint SIGTRAP, ignoring\n");
5632 /* NOTE: cagney/2003-03-29: These checks for a random signal
5633 at one stage in the past included checks for an inferior
5634 function call's call dummy's return breakpoint. The original
5635 comment, that went with the test, read:
5637 ``End of a stack dummy. Some systems (e.g. Sony news) give
5638 another signal besides SIGTRAP, so check here as well as
5641 If someone ever tries to get call dummys on a
5642 non-executable stack to work (where the target would stop
5643 with something like a SIGSEGV), then those tests might need
5644 to be re-instated. Given, however, that the tests were only
5645 enabled when momentary breakpoints were not being used, I
5646 suspect that it won't be the case.
5648 NOTE: kettenis/2004-02-05: Indeed such checks don't seem to
5649 be necessary for call dummies on a non-executable stack on
5652 /* See if the breakpoints module can explain the signal. */
5654 = !bpstat_explains_signal (ecs
->event_thread
->control
.stop_bpstat
,
5655 ecs
->event_thread
->suspend
.stop_signal
);
5657 /* Maybe this was a trap for a software breakpoint that has since
5659 if (random_signal
&& target_stopped_by_sw_breakpoint ())
5661 if (program_breakpoint_here_p (gdbarch
, stop_pc
))
5663 struct regcache
*regcache
;
5666 /* Re-adjust PC to what the program would see if GDB was not
5668 regcache
= get_thread_regcache (ecs
->event_thread
->ptid
);
5669 decr_pc
= gdbarch_decr_pc_after_break (gdbarch
);
5672 struct cleanup
*old_cleanups
= make_cleanup (null_cleanup
, NULL
);
5674 if (record_full_is_used ())
5675 record_full_gdb_operation_disable_set ();
5677 regcache_write_pc (regcache
, stop_pc
+ decr_pc
);
5679 do_cleanups (old_cleanups
);
5684 /* A delayed software breakpoint event. Ignore the trap. */
5686 fprintf_unfiltered (gdb_stdlog
,
5687 "infrun: delayed software breakpoint "
5688 "trap, ignoring\n");
5693 /* Maybe this was a trap for a hardware breakpoint/watchpoint that
5694 has since been removed. */
5695 if (random_signal
&& target_stopped_by_hw_breakpoint ())
5697 /* A delayed hardware breakpoint event. Ignore the trap. */
5699 fprintf_unfiltered (gdb_stdlog
,
5700 "infrun: delayed hardware breakpoint/watchpoint "
5701 "trap, ignoring\n");
5705 /* If not, perhaps stepping/nexting can. */
5707 random_signal
= !(ecs
->event_thread
->suspend
.stop_signal
== GDB_SIGNAL_TRAP
5708 && currently_stepping (ecs
->event_thread
));
5710 /* Perhaps the thread hit a single-step breakpoint of _another_
5711 thread. Single-step breakpoints are transparent to the
5712 breakpoints module. */
5714 random_signal
= !ecs
->hit_singlestep_breakpoint
;
5716 /* No? Perhaps we got a moribund watchpoint. */
5718 random_signal
= !stopped_by_watchpoint
;
5720 /* For the program's own signals, act according to
5721 the signal handling tables. */
5725 /* Signal not for debugging purposes. */
5726 struct inferior
*inf
= find_inferior_ptid (ecs
->ptid
);
5727 enum gdb_signal stop_signal
= ecs
->event_thread
->suspend
.stop_signal
;
5730 fprintf_unfiltered (gdb_stdlog
, "infrun: random signal (%s)\n",
5731 gdb_signal_to_symbol_string (stop_signal
));
5733 stopped_by_random_signal
= 1;
5735 /* Always stop on signals if we're either just gaining control
5736 of the program, or the user explicitly requested this thread
5737 to remain stopped. */
5738 if (stop_soon
!= NO_STOP_QUIETLY
5739 || ecs
->event_thread
->stop_requested
5741 && signal_stop_state (ecs
->event_thread
->suspend
.stop_signal
)))
5747 /* Notify observers the signal has "handle print" set. Note we
5748 returned early above if stopping; normal_stop handles the
5749 printing in that case. */
5750 if (signal_print
[ecs
->event_thread
->suspend
.stop_signal
])
5752 /* The signal table tells us to print about this signal. */
5753 target_terminal_ours_for_output ();
5754 observer_notify_signal_received (ecs
->event_thread
->suspend
.stop_signal
);
5755 target_terminal_inferior ();
5758 /* Clear the signal if it should not be passed. */
5759 if (signal_program
[ecs
->event_thread
->suspend
.stop_signal
] == 0)
5760 ecs
->event_thread
->suspend
.stop_signal
= GDB_SIGNAL_0
;
5762 if (ecs
->event_thread
->prev_pc
== stop_pc
5763 && ecs
->event_thread
->control
.trap_expected
5764 && ecs
->event_thread
->control
.step_resume_breakpoint
== NULL
)
5768 /* We were just starting a new sequence, attempting to
5769 single-step off of a breakpoint and expecting a SIGTRAP.
5770 Instead this signal arrives. This signal will take us out
5771 of the stepping range so GDB needs to remember to, when
5772 the signal handler returns, resume stepping off that
5774 /* To simplify things, "continue" is forced to use the same
5775 code paths as single-step - set a breakpoint at the
5776 signal return address and then, once hit, step off that
5779 fprintf_unfiltered (gdb_stdlog
,
5780 "infrun: signal arrived while stepping over "
5783 was_in_line
= step_over_info_valid_p ();
5784 clear_step_over_info ();
5785 insert_hp_step_resume_breakpoint_at_frame (frame
);
5786 ecs
->event_thread
->step_after_step_resume_breakpoint
= 1;
5787 /* Reset trap_expected to ensure breakpoints are re-inserted. */
5788 ecs
->event_thread
->control
.trap_expected
= 0;
5790 if (target_is_non_stop_p ())
5792 /* Either "set non-stop" is "on", or the target is
5793 always in non-stop mode. In this case, we have a bit
5794 more work to do. Resume the current thread, and if
5795 we had paused all threads, restart them while the
5796 signal handler runs. */
5801 restart_threads (ecs
->event_thread
);
5803 else if (debug_infrun
)
5805 fprintf_unfiltered (gdb_stdlog
,
5806 "infrun: no need to restart threads\n");
5811 /* If we were nexting/stepping some other thread, switch to
5812 it, so that we don't continue it, losing control. */
5813 if (!switch_back_to_stepped_thread (ecs
))
5818 if (ecs
->event_thread
->suspend
.stop_signal
!= GDB_SIGNAL_0
5819 && (pc_in_thread_step_range (stop_pc
, ecs
->event_thread
)
5820 || ecs
->event_thread
->control
.step_range_end
== 1)
5821 && frame_id_eq (get_stack_frame_id (frame
),
5822 ecs
->event_thread
->control
.step_stack_frame_id
)
5823 && ecs
->event_thread
->control
.step_resume_breakpoint
== NULL
)
5825 /* The inferior is about to take a signal that will take it
5826 out of the single step range. Set a breakpoint at the
5827 current PC (which is presumably where the signal handler
5828 will eventually return) and then allow the inferior to
5831 Note that this is only needed for a signal delivered
5832 while in the single-step range. Nested signals aren't a
5833 problem as they eventually all return. */
5835 fprintf_unfiltered (gdb_stdlog
,
5836 "infrun: signal may take us out of "
5837 "single-step range\n");
5839 clear_step_over_info ();
5840 insert_hp_step_resume_breakpoint_at_frame (frame
);
5841 ecs
->event_thread
->step_after_step_resume_breakpoint
= 1;
5842 /* Reset trap_expected to ensure breakpoints are re-inserted. */
5843 ecs
->event_thread
->control
.trap_expected
= 0;
5848 /* Note: step_resume_breakpoint may be non-NULL. This occures
5849 when either there's a nested signal, or when there's a
5850 pending signal enabled just as the signal handler returns
5851 (leaving the inferior at the step-resume-breakpoint without
5852 actually executing it). Either way continue until the
5853 breakpoint is really hit. */
5855 if (!switch_back_to_stepped_thread (ecs
))
5858 fprintf_unfiltered (gdb_stdlog
,
5859 "infrun: random signal, keep going\n");
5866 process_event_stop_test (ecs
);
5869 /* Come here when we've got some debug event / signal we can explain
5870 (IOW, not a random signal), and test whether it should cause a
5871 stop, or whether we should resume the inferior (transparently).
5872 E.g., could be a breakpoint whose condition evaluates false; we
5873 could be still stepping within the line; etc. */
5876 process_event_stop_test (struct execution_control_state
*ecs
)
5878 struct symtab_and_line stop_pc_sal
;
5879 struct frame_info
*frame
;
5880 struct gdbarch
*gdbarch
;
5881 CORE_ADDR jmp_buf_pc
;
5882 struct bpstat_what what
;
5884 /* Handle cases caused by hitting a breakpoint. */
5886 frame
= get_current_frame ();
5887 gdbarch
= get_frame_arch (frame
);
5889 what
= bpstat_what (ecs
->event_thread
->control
.stop_bpstat
);
5891 if (what
.call_dummy
)
5893 stop_stack_dummy
= what
.call_dummy
;
5896 /* If we hit an internal event that triggers symbol changes, the
5897 current frame will be invalidated within bpstat_what (e.g., if we
5898 hit an internal solib event). Re-fetch it. */
5899 frame
= get_current_frame ();
5900 gdbarch
= get_frame_arch (frame
);
5902 switch (what
.main_action
)
5904 case BPSTAT_WHAT_SET_LONGJMP_RESUME
:
5905 /* If we hit the breakpoint at longjmp while stepping, we
5906 install a momentary breakpoint at the target of the
5910 fprintf_unfiltered (gdb_stdlog
,
5911 "infrun: BPSTAT_WHAT_SET_LONGJMP_RESUME\n");
5913 ecs
->event_thread
->stepping_over_breakpoint
= 1;
5915 if (what
.is_longjmp
)
5917 struct value
*arg_value
;
5919 /* If we set the longjmp breakpoint via a SystemTap probe,
5920 then use it to extract the arguments. The destination PC
5921 is the third argument to the probe. */
5922 arg_value
= probe_safe_evaluate_at_pc (frame
, 2);
5925 jmp_buf_pc
= value_as_address (arg_value
);
5926 jmp_buf_pc
= gdbarch_addr_bits_remove (gdbarch
, jmp_buf_pc
);
5928 else if (!gdbarch_get_longjmp_target_p (gdbarch
)
5929 || !gdbarch_get_longjmp_target (gdbarch
,
5930 frame
, &jmp_buf_pc
))
5933 fprintf_unfiltered (gdb_stdlog
,
5934 "infrun: BPSTAT_WHAT_SET_LONGJMP_RESUME "
5935 "(!gdbarch_get_longjmp_target)\n");
5940 /* Insert a breakpoint at resume address. */
5941 insert_longjmp_resume_breakpoint (gdbarch
, jmp_buf_pc
);
5944 check_exception_resume (ecs
, frame
);
5948 case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME
:
5950 struct frame_info
*init_frame
;
5952 /* There are several cases to consider.
5954 1. The initiating frame no longer exists. In this case we
5955 must stop, because the exception or longjmp has gone too
5958 2. The initiating frame exists, and is the same as the
5959 current frame. We stop, because the exception or longjmp
5962 3. The initiating frame exists and is different from the
5963 current frame. This means the exception or longjmp has
5964 been caught beneath the initiating frame, so keep going.
5966 4. longjmp breakpoint has been placed just to protect
5967 against stale dummy frames and user is not interested in
5968 stopping around longjmps. */
5971 fprintf_unfiltered (gdb_stdlog
,
5972 "infrun: BPSTAT_WHAT_CLEAR_LONGJMP_RESUME\n");
5974 gdb_assert (ecs
->event_thread
->control
.exception_resume_breakpoint
5976 delete_exception_resume_breakpoint (ecs
->event_thread
);
5978 if (what
.is_longjmp
)
5980 check_longjmp_breakpoint_for_call_dummy (ecs
->event_thread
);
5982 if (!frame_id_p (ecs
->event_thread
->initiating_frame
))
5990 init_frame
= frame_find_by_id (ecs
->event_thread
->initiating_frame
);
5994 struct frame_id current_id
5995 = get_frame_id (get_current_frame ());
5996 if (frame_id_eq (current_id
,
5997 ecs
->event_thread
->initiating_frame
))
5999 /* Case 2. Fall through. */
6009 /* For Cases 1 and 2, remove the step-resume breakpoint, if it
6011 delete_step_resume_breakpoint (ecs
->event_thread
);
6013 end_stepping_range (ecs
);
6017 case BPSTAT_WHAT_SINGLE
:
6019 fprintf_unfiltered (gdb_stdlog
, "infrun: BPSTAT_WHAT_SINGLE\n");
6020 ecs
->event_thread
->stepping_over_breakpoint
= 1;
6021 /* Still need to check other stuff, at least the case where we
6022 are stepping and step out of the right range. */
6025 case BPSTAT_WHAT_STEP_RESUME
:
6027 fprintf_unfiltered (gdb_stdlog
, "infrun: BPSTAT_WHAT_STEP_RESUME\n");
6029 delete_step_resume_breakpoint (ecs
->event_thread
);
6030 if (ecs
->event_thread
->control
.proceed_to_finish
6031 && execution_direction
== EXEC_REVERSE
)
6033 struct thread_info
*tp
= ecs
->event_thread
;
6035 /* We are finishing a function in reverse, and just hit the
6036 step-resume breakpoint at the start address of the
6037 function, and we're almost there -- just need to back up
6038 by one more single-step, which should take us back to the
6040 tp
->control
.step_range_start
= tp
->control
.step_range_end
= 1;
6044 fill_in_stop_func (gdbarch
, ecs
);
6045 if (stop_pc
== ecs
->stop_func_start
6046 && execution_direction
== EXEC_REVERSE
)
6048 /* We are stepping over a function call in reverse, and just
6049 hit the step-resume breakpoint at the start address of
6050 the function. Go back to single-stepping, which should
6051 take us back to the function call. */
6052 ecs
->event_thread
->stepping_over_breakpoint
= 1;
6058 case BPSTAT_WHAT_STOP_NOISY
:
6060 fprintf_unfiltered (gdb_stdlog
, "infrun: BPSTAT_WHAT_STOP_NOISY\n");
6061 stop_print_frame
= 1;
6063 /* Assume the thread stopped for a breapoint. We'll still check
6064 whether a/the breakpoint is there when the thread is next
6066 ecs
->event_thread
->stepping_over_breakpoint
= 1;
6071 case BPSTAT_WHAT_STOP_SILENT
:
6073 fprintf_unfiltered (gdb_stdlog
, "infrun: BPSTAT_WHAT_STOP_SILENT\n");
6074 stop_print_frame
= 0;
6076 /* Assume the thread stopped for a breapoint. We'll still check
6077 whether a/the breakpoint is there when the thread is next
6079 ecs
->event_thread
->stepping_over_breakpoint
= 1;
6083 case BPSTAT_WHAT_HP_STEP_RESUME
:
6085 fprintf_unfiltered (gdb_stdlog
, "infrun: BPSTAT_WHAT_HP_STEP_RESUME\n");
6087 delete_step_resume_breakpoint (ecs
->event_thread
);
6088 if (ecs
->event_thread
->step_after_step_resume_breakpoint
)
6090 /* Back when the step-resume breakpoint was inserted, we
6091 were trying to single-step off a breakpoint. Go back to
6093 ecs
->event_thread
->step_after_step_resume_breakpoint
= 0;
6094 ecs
->event_thread
->stepping_over_breakpoint
= 1;
6100 case BPSTAT_WHAT_KEEP_CHECKING
:
6104 /* If we stepped a permanent breakpoint and we had a high priority
6105 step-resume breakpoint for the address we stepped, but we didn't
6106 hit it, then we must have stepped into the signal handler. The
6107 step-resume was only necessary to catch the case of _not_
6108 stepping into the handler, so delete it, and fall through to
6109 checking whether the step finished. */
6110 if (ecs
->event_thread
->stepped_breakpoint
)
6112 struct breakpoint
*sr_bp
6113 = ecs
->event_thread
->control
.step_resume_breakpoint
;
6116 && sr_bp
->loc
->permanent
6117 && sr_bp
->type
== bp_hp_step_resume
6118 && sr_bp
->loc
->address
== ecs
->event_thread
->prev_pc
)
6121 fprintf_unfiltered (gdb_stdlog
,
6122 "infrun: stepped permanent breakpoint, stopped in "
6124 delete_step_resume_breakpoint (ecs
->event_thread
);
6125 ecs
->event_thread
->step_after_step_resume_breakpoint
= 0;
6129 /* We come here if we hit a breakpoint but should not stop for it.
6130 Possibly we also were stepping and should stop for that. So fall
6131 through and test for stepping. But, if not stepping, do not
6134 /* In all-stop mode, if we're currently stepping but have stopped in
6135 some other thread, we need to switch back to the stepped thread. */
6136 if (switch_back_to_stepped_thread (ecs
))
6139 if (ecs
->event_thread
->control
.step_resume_breakpoint
)
6142 fprintf_unfiltered (gdb_stdlog
,
6143 "infrun: step-resume breakpoint is inserted\n");
6145 /* Having a step-resume breakpoint overrides anything
6146 else having to do with stepping commands until
6147 that breakpoint is reached. */
6152 if (ecs
->event_thread
->control
.step_range_end
== 0)
6155 fprintf_unfiltered (gdb_stdlog
, "infrun: no stepping, continue\n");
6156 /* Likewise if we aren't even stepping. */
6161 /* Re-fetch current thread's frame in case the code above caused
6162 the frame cache to be re-initialized, making our FRAME variable
6163 a dangling pointer. */
6164 frame
= get_current_frame ();
6165 gdbarch
= get_frame_arch (frame
);
6166 fill_in_stop_func (gdbarch
, ecs
);
6168 /* If stepping through a line, keep going if still within it.
6170 Note that step_range_end is the address of the first instruction
6171 beyond the step range, and NOT the address of the last instruction
6174 Note also that during reverse execution, we may be stepping
6175 through a function epilogue and therefore must detect when
6176 the current-frame changes in the middle of a line. */
6178 if (pc_in_thread_step_range (stop_pc
, ecs
->event_thread
)
6179 && (execution_direction
!= EXEC_REVERSE
6180 || frame_id_eq (get_frame_id (frame
),
6181 ecs
->event_thread
->control
.step_frame_id
)))
6185 (gdb_stdlog
, "infrun: stepping inside range [%s-%s]\n",
6186 paddress (gdbarch
, ecs
->event_thread
->control
.step_range_start
),
6187 paddress (gdbarch
, ecs
->event_thread
->control
.step_range_end
));
6189 /* Tentatively re-enable range stepping; `resume' disables it if
6190 necessary (e.g., if we're stepping over a breakpoint or we
6191 have software watchpoints). */
6192 ecs
->event_thread
->control
.may_range_step
= 1;
6194 /* When stepping backward, stop at beginning of line range
6195 (unless it's the function entry point, in which case
6196 keep going back to the call point). */
6197 if (stop_pc
== ecs
->event_thread
->control
.step_range_start
6198 && stop_pc
!= ecs
->stop_func_start
6199 && execution_direction
== EXEC_REVERSE
)
6200 end_stepping_range (ecs
);
6207 /* We stepped out of the stepping range. */
6209 /* If we are stepping at the source level and entered the runtime
6210 loader dynamic symbol resolution code...
6212 EXEC_FORWARD: we keep on single stepping until we exit the run
6213 time loader code and reach the callee's address.
6215 EXEC_REVERSE: we've already executed the callee (backward), and
6216 the runtime loader code is handled just like any other
6217 undebuggable function call. Now we need only keep stepping
6218 backward through the trampoline code, and that's handled further
6219 down, so there is nothing for us to do here. */
6221 if (execution_direction
!= EXEC_REVERSE
6222 && ecs
->event_thread
->control
.step_over_calls
== STEP_OVER_UNDEBUGGABLE
6223 && in_solib_dynsym_resolve_code (stop_pc
))
6225 CORE_ADDR pc_after_resolver
=
6226 gdbarch_skip_solib_resolver (gdbarch
, stop_pc
);
6229 fprintf_unfiltered (gdb_stdlog
,
6230 "infrun: stepped into dynsym resolve code\n");
6232 if (pc_after_resolver
)
6234 /* Set up a step-resume breakpoint at the address
6235 indicated by SKIP_SOLIB_RESOLVER. */
6236 struct symtab_and_line sr_sal
;
6239 sr_sal
.pc
= pc_after_resolver
;
6240 sr_sal
.pspace
= get_frame_program_space (frame
);
6242 insert_step_resume_breakpoint_at_sal (gdbarch
,
6243 sr_sal
, null_frame_id
);
6250 if (ecs
->event_thread
->control
.step_range_end
!= 1
6251 && (ecs
->event_thread
->control
.step_over_calls
== STEP_OVER_UNDEBUGGABLE
6252 || ecs
->event_thread
->control
.step_over_calls
== STEP_OVER_ALL
)
6253 && get_frame_type (frame
) == SIGTRAMP_FRAME
)
6256 fprintf_unfiltered (gdb_stdlog
,
6257 "infrun: stepped into signal trampoline\n");
6258 /* The inferior, while doing a "step" or "next", has ended up in
6259 a signal trampoline (either by a signal being delivered or by
6260 the signal handler returning). Just single-step until the
6261 inferior leaves the trampoline (either by calling the handler
6267 /* If we're in the return path from a shared library trampoline,
6268 we want to proceed through the trampoline when stepping. */
6269 /* macro/2012-04-25: This needs to come before the subroutine
6270 call check below as on some targets return trampolines look
6271 like subroutine calls (MIPS16 return thunks). */
6272 if (gdbarch_in_solib_return_trampoline (gdbarch
,
6273 stop_pc
, ecs
->stop_func_name
)
6274 && ecs
->event_thread
->control
.step_over_calls
!= STEP_OVER_NONE
)
6276 /* Determine where this trampoline returns. */
6277 CORE_ADDR real_stop_pc
;
6279 real_stop_pc
= gdbarch_skip_trampoline_code (gdbarch
, frame
, stop_pc
);
6282 fprintf_unfiltered (gdb_stdlog
,
6283 "infrun: stepped into solib return tramp\n");
6285 /* Only proceed through if we know where it's going. */
6288 /* And put the step-breakpoint there and go until there. */
6289 struct symtab_and_line sr_sal
;
6291 init_sal (&sr_sal
); /* initialize to zeroes */
6292 sr_sal
.pc
= real_stop_pc
;
6293 sr_sal
.section
= find_pc_overlay (sr_sal
.pc
);
6294 sr_sal
.pspace
= get_frame_program_space (frame
);
6296 /* Do not specify what the fp should be when we stop since
6297 on some machines the prologue is where the new fp value
6299 insert_step_resume_breakpoint_at_sal (gdbarch
,
6300 sr_sal
, null_frame_id
);
6302 /* Restart without fiddling with the step ranges or
6309 /* Check for subroutine calls. The check for the current frame
6310 equalling the step ID is not necessary - the check of the
6311 previous frame's ID is sufficient - but it is a common case and
6312 cheaper than checking the previous frame's ID.
6314 NOTE: frame_id_eq will never report two invalid frame IDs as
6315 being equal, so to get into this block, both the current and
6316 previous frame must have valid frame IDs. */
6317 /* The outer_frame_id check is a heuristic to detect stepping
6318 through startup code. If we step over an instruction which
6319 sets the stack pointer from an invalid value to a valid value,
6320 we may detect that as a subroutine call from the mythical
6321 "outermost" function. This could be fixed by marking
6322 outermost frames as !stack_p,code_p,special_p. Then the
6323 initial outermost frame, before sp was valid, would
6324 have code_addr == &_start. See the comment in frame_id_eq
6326 if (!frame_id_eq (get_stack_frame_id (frame
),
6327 ecs
->event_thread
->control
.step_stack_frame_id
)
6328 && (frame_id_eq (frame_unwind_caller_id (get_current_frame ()),
6329 ecs
->event_thread
->control
.step_stack_frame_id
)
6330 && (!frame_id_eq (ecs
->event_thread
->control
.step_stack_frame_id
,
6332 || (ecs
->event_thread
->control
.step_start_function
6333 != find_pc_function (stop_pc
)))))
6335 CORE_ADDR real_stop_pc
;
6338 fprintf_unfiltered (gdb_stdlog
, "infrun: stepped into subroutine\n");
6340 if (ecs
->event_thread
->control
.step_over_calls
== STEP_OVER_NONE
)
6342 /* I presume that step_over_calls is only 0 when we're
6343 supposed to be stepping at the assembly language level
6344 ("stepi"). Just stop. */
6345 /* And this works the same backward as frontward. MVS */
6346 end_stepping_range (ecs
);
6350 /* Reverse stepping through solib trampolines. */
6352 if (execution_direction
== EXEC_REVERSE
6353 && ecs
->event_thread
->control
.step_over_calls
!= STEP_OVER_NONE
6354 && (gdbarch_skip_trampoline_code (gdbarch
, frame
, stop_pc
)
6355 || (ecs
->stop_func_start
== 0
6356 && in_solib_dynsym_resolve_code (stop_pc
))))
6358 /* Any solib trampoline code can be handled in reverse
6359 by simply continuing to single-step. We have already
6360 executed the solib function (backwards), and a few
6361 steps will take us back through the trampoline to the
6367 if (ecs
->event_thread
->control
.step_over_calls
== STEP_OVER_ALL
)
6369 /* We're doing a "next".
6371 Normal (forward) execution: set a breakpoint at the
6372 callee's return address (the address at which the caller
6375 Reverse (backward) execution. set the step-resume
6376 breakpoint at the start of the function that we just
6377 stepped into (backwards), and continue to there. When we
6378 get there, we'll need to single-step back to the caller. */
6380 if (execution_direction
== EXEC_REVERSE
)
6382 /* If we're already at the start of the function, we've either
6383 just stepped backward into a single instruction function,
6384 or stepped back out of a signal handler to the first instruction
6385 of the function. Just keep going, which will single-step back
6387 if (ecs
->stop_func_start
!= stop_pc
&& ecs
->stop_func_start
!= 0)
6389 struct symtab_and_line sr_sal
;
6391 /* Normal function call return (static or dynamic). */
6393 sr_sal
.pc
= ecs
->stop_func_start
;
6394 sr_sal
.pspace
= get_frame_program_space (frame
);
6395 insert_step_resume_breakpoint_at_sal (gdbarch
,
6396 sr_sal
, null_frame_id
);
6400 insert_step_resume_breakpoint_at_caller (frame
);
6406 /* If we are in a function call trampoline (a stub between the
6407 calling routine and the real function), locate the real
6408 function. That's what tells us (a) whether we want to step
6409 into it at all, and (b) what prologue we want to run to the
6410 end of, if we do step into it. */
6411 real_stop_pc
= skip_language_trampoline (frame
, stop_pc
);
6412 if (real_stop_pc
== 0)
6413 real_stop_pc
= gdbarch_skip_trampoline_code (gdbarch
, frame
, stop_pc
);
6414 if (real_stop_pc
!= 0)
6415 ecs
->stop_func_start
= real_stop_pc
;
6417 if (real_stop_pc
!= 0 && in_solib_dynsym_resolve_code (real_stop_pc
))
6419 struct symtab_and_line sr_sal
;
6422 sr_sal
.pc
= ecs
->stop_func_start
;
6423 sr_sal
.pspace
= get_frame_program_space (frame
);
6425 insert_step_resume_breakpoint_at_sal (gdbarch
,
6426 sr_sal
, null_frame_id
);
6431 /* If we have line number information for the function we are
6432 thinking of stepping into and the function isn't on the skip
6435 If there are several symtabs at that PC (e.g. with include
6436 files), just want to know whether *any* of them have line
6437 numbers. find_pc_line handles this. */
6439 struct symtab_and_line tmp_sal
;
6441 tmp_sal
= find_pc_line (ecs
->stop_func_start
, 0);
6442 if (tmp_sal
.line
!= 0
6443 && !function_name_is_marked_for_skip (ecs
->stop_func_name
,
6446 if (execution_direction
== EXEC_REVERSE
)
6447 handle_step_into_function_backward (gdbarch
, ecs
);
6449 handle_step_into_function (gdbarch
, ecs
);
6454 /* If we have no line number and the step-stop-if-no-debug is
6455 set, we stop the step so that the user has a chance to switch
6456 in assembly mode. */
6457 if (ecs
->event_thread
->control
.step_over_calls
== STEP_OVER_UNDEBUGGABLE
6458 && step_stop_if_no_debug
)
6460 end_stepping_range (ecs
);
6464 if (execution_direction
== EXEC_REVERSE
)
6466 /* If we're already at the start of the function, we've either just
6467 stepped backward into a single instruction function without line
6468 number info, or stepped back out of a signal handler to the first
6469 instruction of the function without line number info. Just keep
6470 going, which will single-step back to the caller. */
6471 if (ecs
->stop_func_start
!= stop_pc
)
6473 /* Set a breakpoint at callee's start address.
6474 From there we can step once and be back in the caller. */
6475 struct symtab_and_line sr_sal
;
6478 sr_sal
.pc
= ecs
->stop_func_start
;
6479 sr_sal
.pspace
= get_frame_program_space (frame
);
6480 insert_step_resume_breakpoint_at_sal (gdbarch
,
6481 sr_sal
, null_frame_id
);
6485 /* Set a breakpoint at callee's return address (the address
6486 at which the caller will resume). */
6487 insert_step_resume_breakpoint_at_caller (frame
);
6493 /* Reverse stepping through solib trampolines. */
6495 if (execution_direction
== EXEC_REVERSE
6496 && ecs
->event_thread
->control
.step_over_calls
!= STEP_OVER_NONE
)
6498 if (gdbarch_skip_trampoline_code (gdbarch
, frame
, stop_pc
)
6499 || (ecs
->stop_func_start
== 0
6500 && in_solib_dynsym_resolve_code (stop_pc
)))
6502 /* Any solib trampoline code can be handled in reverse
6503 by simply continuing to single-step. We have already
6504 executed the solib function (backwards), and a few
6505 steps will take us back through the trampoline to the
6510 else if (in_solib_dynsym_resolve_code (stop_pc
))
6512 /* Stepped backward into the solib dynsym resolver.
6513 Set a breakpoint at its start and continue, then
6514 one more step will take us out. */
6515 struct symtab_and_line sr_sal
;
6518 sr_sal
.pc
= ecs
->stop_func_start
;
6519 sr_sal
.pspace
= get_frame_program_space (frame
);
6520 insert_step_resume_breakpoint_at_sal (gdbarch
,
6521 sr_sal
, null_frame_id
);
6527 stop_pc_sal
= find_pc_line (stop_pc
, 0);
6529 /* NOTE: tausq/2004-05-24: This if block used to be done before all
6530 the trampoline processing logic, however, there are some trampolines
6531 that have no names, so we should do trampoline handling first. */
6532 if (ecs
->event_thread
->control
.step_over_calls
== STEP_OVER_UNDEBUGGABLE
6533 && ecs
->stop_func_name
== NULL
6534 && stop_pc_sal
.line
== 0)
6537 fprintf_unfiltered (gdb_stdlog
,
6538 "infrun: stepped into undebuggable function\n");
6540 /* The inferior just stepped into, or returned to, an
6541 undebuggable function (where there is no debugging information
6542 and no line number corresponding to the address where the
6543 inferior stopped). Since we want to skip this kind of code,
6544 we keep going until the inferior returns from this
6545 function - unless the user has asked us not to (via
6546 set step-mode) or we no longer know how to get back
6547 to the call site. */
6548 if (step_stop_if_no_debug
6549 || !frame_id_p (frame_unwind_caller_id (frame
)))
6551 /* If we have no line number and the step-stop-if-no-debug
6552 is set, we stop the step so that the user has a chance to
6553 switch in assembly mode. */
6554 end_stepping_range (ecs
);
6559 /* Set a breakpoint at callee's return address (the address
6560 at which the caller will resume). */
6561 insert_step_resume_breakpoint_at_caller (frame
);
6567 if (ecs
->event_thread
->control
.step_range_end
== 1)
6569 /* It is stepi or nexti. We always want to stop stepping after
6572 fprintf_unfiltered (gdb_stdlog
, "infrun: stepi/nexti\n");
6573 end_stepping_range (ecs
);
6577 if (stop_pc_sal
.line
== 0)
6579 /* We have no line number information. That means to stop
6580 stepping (does this always happen right after one instruction,
6581 when we do "s" in a function with no line numbers,
6582 or can this happen as a result of a return or longjmp?). */
6584 fprintf_unfiltered (gdb_stdlog
, "infrun: no line number info\n");
6585 end_stepping_range (ecs
);
6589 /* Look for "calls" to inlined functions, part one. If the inline
6590 frame machinery detected some skipped call sites, we have entered
6591 a new inline function. */
6593 if (frame_id_eq (get_frame_id (get_current_frame ()),
6594 ecs
->event_thread
->control
.step_frame_id
)
6595 && inline_skipped_frames (ecs
->ptid
))
6597 struct symtab_and_line call_sal
;
6600 fprintf_unfiltered (gdb_stdlog
,
6601 "infrun: stepped into inlined function\n");
6603 find_frame_sal (get_current_frame (), &call_sal
);
6605 if (ecs
->event_thread
->control
.step_over_calls
!= STEP_OVER_ALL
)
6607 /* For "step", we're going to stop. But if the call site
6608 for this inlined function is on the same source line as
6609 we were previously stepping, go down into the function
6610 first. Otherwise stop at the call site. */
6612 if (call_sal
.line
== ecs
->event_thread
->current_line
6613 && call_sal
.symtab
== ecs
->event_thread
->current_symtab
)
6614 step_into_inline_frame (ecs
->ptid
);
6616 end_stepping_range (ecs
);
6621 /* For "next", we should stop at the call site if it is on a
6622 different source line. Otherwise continue through the
6623 inlined function. */
6624 if (call_sal
.line
== ecs
->event_thread
->current_line
6625 && call_sal
.symtab
== ecs
->event_thread
->current_symtab
)
6628 end_stepping_range (ecs
);
6633 /* Look for "calls" to inlined functions, part two. If we are still
6634 in the same real function we were stepping through, but we have
6635 to go further up to find the exact frame ID, we are stepping
6636 through a more inlined call beyond its call site. */
6638 if (get_frame_type (get_current_frame ()) == INLINE_FRAME
6639 && !frame_id_eq (get_frame_id (get_current_frame ()),
6640 ecs
->event_thread
->control
.step_frame_id
)
6641 && stepped_in_from (get_current_frame (),
6642 ecs
->event_thread
->control
.step_frame_id
))
6645 fprintf_unfiltered (gdb_stdlog
,
6646 "infrun: stepping through inlined function\n");
6648 if (ecs
->event_thread
->control
.step_over_calls
== STEP_OVER_ALL
)
6651 end_stepping_range (ecs
);
6655 if ((stop_pc
== stop_pc_sal
.pc
)
6656 && (ecs
->event_thread
->current_line
!= stop_pc_sal
.line
6657 || ecs
->event_thread
->current_symtab
!= stop_pc_sal
.symtab
))
6659 /* We are at the start of a different line. So stop. Note that
6660 we don't stop if we step into the middle of a different line.
6661 That is said to make things like for (;;) statements work
6664 fprintf_unfiltered (gdb_stdlog
,
6665 "infrun: stepped to a different line\n");
6666 end_stepping_range (ecs
);
6670 /* We aren't done stepping.
6672 Optimize by setting the stepping range to the line.
6673 (We might not be in the original line, but if we entered a
6674 new line in mid-statement, we continue stepping. This makes
6675 things like for(;;) statements work better.) */
6677 ecs
->event_thread
->control
.step_range_start
= stop_pc_sal
.pc
;
6678 ecs
->event_thread
->control
.step_range_end
= stop_pc_sal
.end
;
6679 ecs
->event_thread
->control
.may_range_step
= 1;
6680 set_step_info (frame
, stop_pc_sal
);
6683 fprintf_unfiltered (gdb_stdlog
, "infrun: keep going\n");
6687 /* In all-stop mode, if we're currently stepping but have stopped in
6688 some other thread, we may need to switch back to the stepped
6689 thread. Returns true we set the inferior running, false if we left
6690 it stopped (and the event needs further processing). */
6693 switch_back_to_stepped_thread (struct execution_control_state
*ecs
)
6695 if (!target_is_non_stop_p ())
6697 struct thread_info
*tp
;
6698 struct thread_info
*stepping_thread
;
6700 /* If any thread is blocked on some internal breakpoint, and we
6701 simply need to step over that breakpoint to get it going
6702 again, do that first. */
6704 /* However, if we see an event for the stepping thread, then we
6705 know all other threads have been moved past their breakpoints
6706 already. Let the caller check whether the step is finished,
6707 etc., before deciding to move it past a breakpoint. */
6708 if (ecs
->event_thread
->control
.step_range_end
!= 0)
6711 /* Check if the current thread is blocked on an incomplete
6712 step-over, interrupted by a random signal. */
6713 if (ecs
->event_thread
->control
.trap_expected
6714 && ecs
->event_thread
->suspend
.stop_signal
!= GDB_SIGNAL_TRAP
)
6718 fprintf_unfiltered (gdb_stdlog
,
6719 "infrun: need to finish step-over of [%s]\n",
6720 target_pid_to_str (ecs
->event_thread
->ptid
));
6726 /* Check if the current thread is blocked by a single-step
6727 breakpoint of another thread. */
6728 if (ecs
->hit_singlestep_breakpoint
)
6732 fprintf_unfiltered (gdb_stdlog
,
6733 "infrun: need to step [%s] over single-step "
6735 target_pid_to_str (ecs
->ptid
));
6741 /* If this thread needs yet another step-over (e.g., stepping
6742 through a delay slot), do it first before moving on to
6744 if (thread_still_needs_step_over (ecs
->event_thread
))
6748 fprintf_unfiltered (gdb_stdlog
,
6749 "infrun: thread [%s] still needs step-over\n",
6750 target_pid_to_str (ecs
->event_thread
->ptid
));
6756 /* If scheduler locking applies even if not stepping, there's no
6757 need to walk over threads. Above we've checked whether the
6758 current thread is stepping. If some other thread not the
6759 event thread is stepping, then it must be that scheduler
6760 locking is not in effect. */
6761 if (schedlock_applies (ecs
->event_thread
))
6764 /* Otherwise, we no longer expect a trap in the current thread.
6765 Clear the trap_expected flag before switching back -- this is
6766 what keep_going does as well, if we call it. */
6767 ecs
->event_thread
->control
.trap_expected
= 0;
6769 /* Likewise, clear the signal if it should not be passed. */
6770 if (!signal_program
[ecs
->event_thread
->suspend
.stop_signal
])
6771 ecs
->event_thread
->suspend
.stop_signal
= GDB_SIGNAL_0
;
6773 /* Do all pending step-overs before actually proceeding with
6775 if (start_step_over ())
6777 prepare_to_wait (ecs
);
6781 /* Look for the stepping/nexting thread. */
6782 stepping_thread
= NULL
;
6784 ALL_NON_EXITED_THREADS (tp
)
6786 /* Ignore threads of processes the caller is not
6789 && ptid_get_pid (tp
->ptid
) != ptid_get_pid (ecs
->ptid
))
6792 /* When stepping over a breakpoint, we lock all threads
6793 except the one that needs to move past the breakpoint.
6794 If a non-event thread has this set, the "incomplete
6795 step-over" check above should have caught it earlier. */
6796 if (tp
->control
.trap_expected
)
6798 internal_error (__FILE__
, __LINE__
,
6799 "[%s] has inconsistent state: "
6800 "trap_expected=%d\n",
6801 target_pid_to_str (tp
->ptid
),
6802 tp
->control
.trap_expected
);
6805 /* Did we find the stepping thread? */
6806 if (tp
->control
.step_range_end
)
6808 /* Yep. There should only one though. */
6809 gdb_assert (stepping_thread
== NULL
);
6811 /* The event thread is handled at the top, before we
6813 gdb_assert (tp
!= ecs
->event_thread
);
6815 /* If some thread other than the event thread is
6816 stepping, then scheduler locking can't be in effect,
6817 otherwise we wouldn't have resumed the current event
6818 thread in the first place. */
6819 gdb_assert (!schedlock_applies (tp
));
6821 stepping_thread
= tp
;
6825 if (stepping_thread
!= NULL
)
6828 fprintf_unfiltered (gdb_stdlog
,
6829 "infrun: switching back to stepped thread\n");
6831 if (keep_going_stepped_thread (stepping_thread
))
6833 prepare_to_wait (ecs
);
6842 /* Set a previously stepped thread back to stepping. Returns true on
6843 success, false if the resume is not possible (e.g., the thread
6847 keep_going_stepped_thread (struct thread_info
*tp
)
6849 struct frame_info
*frame
;
6850 struct gdbarch
*gdbarch
;
6851 struct execution_control_state ecss
;
6852 struct execution_control_state
*ecs
= &ecss
;
6854 /* If the stepping thread exited, then don't try to switch back and
6855 resume it, which could fail in several different ways depending
6856 on the target. Instead, just keep going.
6858 We can find a stepping dead thread in the thread list in two
6861 - The target supports thread exit events, and when the target
6862 tries to delete the thread from the thread list, inferior_ptid
6863 pointed at the exiting thread. In such case, calling
6864 delete_thread does not really remove the thread from the list;
6865 instead, the thread is left listed, with 'exited' state.
6867 - The target's debug interface does not support thread exit
6868 events, and so we have no idea whatsoever if the previously
6869 stepping thread is still alive. For that reason, we need to
6870 synchronously query the target now. */
6872 if (is_exited (tp
->ptid
)
6873 || !target_thread_alive (tp
->ptid
))
6876 fprintf_unfiltered (gdb_stdlog
,
6877 "infrun: not resuming previously "
6878 "stepped thread, it has vanished\n");
6880 delete_thread (tp
->ptid
);
6885 fprintf_unfiltered (gdb_stdlog
,
6886 "infrun: resuming previously stepped thread\n");
6888 reset_ecs (ecs
, tp
);
6889 switch_to_thread (tp
->ptid
);
6891 stop_pc
= regcache_read_pc (get_thread_regcache (tp
->ptid
));
6892 frame
= get_current_frame ();
6893 gdbarch
= get_frame_arch (frame
);
6895 /* If the PC of the thread we were trying to single-step has
6896 changed, then that thread has trapped or been signaled, but the
6897 event has not been reported to GDB yet. Re-poll the target
6898 looking for this particular thread's event (i.e. temporarily
6899 enable schedlock) by:
6901 - setting a break at the current PC
6902 - resuming that particular thread, only (by setting trap
6905 This prevents us continuously moving the single-step breakpoint
6906 forward, one instruction at a time, overstepping. */
6908 if (stop_pc
!= tp
->prev_pc
)
6913 fprintf_unfiltered (gdb_stdlog
,
6914 "infrun: expected thread advanced also (%s -> %s)\n",
6915 paddress (target_gdbarch (), tp
->prev_pc
),
6916 paddress (target_gdbarch (), stop_pc
));
6918 /* Clear the info of the previous step-over, as it's no longer
6919 valid (if the thread was trying to step over a breakpoint, it
6920 has already succeeded). It's what keep_going would do too,
6921 if we called it. Do this before trying to insert the sss
6922 breakpoint, otherwise if we were previously trying to step
6923 over this exact address in another thread, the breakpoint is
6925 clear_step_over_info ();
6926 tp
->control
.trap_expected
= 0;
6928 insert_single_step_breakpoint (get_frame_arch (frame
),
6929 get_frame_address_space (frame
),
6933 resume_ptid
= internal_resume_ptid (tp
->control
.stepping_command
);
6934 do_target_resume (resume_ptid
, 0, GDB_SIGNAL_0
);
6939 fprintf_unfiltered (gdb_stdlog
,
6940 "infrun: expected thread still hasn't advanced\n");
6942 keep_going_pass_signal (ecs
);
6947 /* Is thread TP in the middle of (software or hardware)
6948 single-stepping? (Note the result of this function must never be
6949 passed directly as target_resume's STEP parameter.) */
6952 currently_stepping (struct thread_info
*tp
)
6954 return ((tp
->control
.step_range_end
6955 && tp
->control
.step_resume_breakpoint
== NULL
)
6956 || tp
->control
.trap_expected
6957 || tp
->stepped_breakpoint
6958 || bpstat_should_step ());
6961 /* Inferior has stepped into a subroutine call with source code that
6962 we should not step over. Do step to the first line of code in
6966 handle_step_into_function (struct gdbarch
*gdbarch
,
6967 struct execution_control_state
*ecs
)
6969 struct compunit_symtab
*cust
;
6970 struct symtab_and_line stop_func_sal
, sr_sal
;
6972 fill_in_stop_func (gdbarch
, ecs
);
6974 cust
= find_pc_compunit_symtab (stop_pc
);
6975 if (cust
!= NULL
&& compunit_language (cust
) != language_asm
)
6976 ecs
->stop_func_start
= gdbarch_skip_prologue (gdbarch
,
6977 ecs
->stop_func_start
);
6979 stop_func_sal
= find_pc_line (ecs
->stop_func_start
, 0);
6980 /* Use the step_resume_break to step until the end of the prologue,
6981 even if that involves jumps (as it seems to on the vax under
6983 /* If the prologue ends in the middle of a source line, continue to
6984 the end of that source line (if it is still within the function).
6985 Otherwise, just go to end of prologue. */
6986 if (stop_func_sal
.end
6987 && stop_func_sal
.pc
!= ecs
->stop_func_start
6988 && stop_func_sal
.end
< ecs
->stop_func_end
)
6989 ecs
->stop_func_start
= stop_func_sal
.end
;
6991 /* Architectures which require breakpoint adjustment might not be able
6992 to place a breakpoint at the computed address. If so, the test
6993 ``ecs->stop_func_start == stop_pc'' will never succeed. Adjust
6994 ecs->stop_func_start to an address at which a breakpoint may be
6995 legitimately placed.
6997 Note: kevinb/2004-01-19: On FR-V, if this adjustment is not
6998 made, GDB will enter an infinite loop when stepping through
6999 optimized code consisting of VLIW instructions which contain
7000 subinstructions corresponding to different source lines. On
7001 FR-V, it's not permitted to place a breakpoint on any but the
7002 first subinstruction of a VLIW instruction. When a breakpoint is
7003 set, GDB will adjust the breakpoint address to the beginning of
7004 the VLIW instruction. Thus, we need to make the corresponding
7005 adjustment here when computing the stop address. */
7007 if (gdbarch_adjust_breakpoint_address_p (gdbarch
))
7009 ecs
->stop_func_start
7010 = gdbarch_adjust_breakpoint_address (gdbarch
,
7011 ecs
->stop_func_start
);
7014 if (ecs
->stop_func_start
== stop_pc
)
7016 /* We are already there: stop now. */
7017 end_stepping_range (ecs
);
7022 /* Put the step-breakpoint there and go until there. */
7023 init_sal (&sr_sal
); /* initialize to zeroes */
7024 sr_sal
.pc
= ecs
->stop_func_start
;
7025 sr_sal
.section
= find_pc_overlay (ecs
->stop_func_start
);
7026 sr_sal
.pspace
= get_frame_program_space (get_current_frame ());
7028 /* Do not specify what the fp should be when we stop since on
7029 some machines the prologue is where the new fp value is
7031 insert_step_resume_breakpoint_at_sal (gdbarch
, sr_sal
, null_frame_id
);
7033 /* And make sure stepping stops right away then. */
7034 ecs
->event_thread
->control
.step_range_end
7035 = ecs
->event_thread
->control
.step_range_start
;
7040 /* Inferior has stepped backward into a subroutine call with source
7041 code that we should not step over. Do step to the beginning of the
7042 last line of code in it. */
7045 handle_step_into_function_backward (struct gdbarch
*gdbarch
,
7046 struct execution_control_state
*ecs
)
7048 struct compunit_symtab
*cust
;
7049 struct symtab_and_line stop_func_sal
;
7051 fill_in_stop_func (gdbarch
, ecs
);
7053 cust
= find_pc_compunit_symtab (stop_pc
);
7054 if (cust
!= NULL
&& compunit_language (cust
) != language_asm
)
7055 ecs
->stop_func_start
= gdbarch_skip_prologue (gdbarch
,
7056 ecs
->stop_func_start
);
7058 stop_func_sal
= find_pc_line (stop_pc
, 0);
7060 /* OK, we're just going to keep stepping here. */
7061 if (stop_func_sal
.pc
== stop_pc
)
7063 /* We're there already. Just stop stepping now. */
7064 end_stepping_range (ecs
);
7068 /* Else just reset the step range and keep going.
7069 No step-resume breakpoint, they don't work for
7070 epilogues, which can have multiple entry paths. */
7071 ecs
->event_thread
->control
.step_range_start
= stop_func_sal
.pc
;
7072 ecs
->event_thread
->control
.step_range_end
= stop_func_sal
.end
;
7078 /* Insert a "step-resume breakpoint" at SR_SAL with frame ID SR_ID.
7079 This is used to both functions and to skip over code. */
7082 insert_step_resume_breakpoint_at_sal_1 (struct gdbarch
*gdbarch
,
7083 struct symtab_and_line sr_sal
,
7084 struct frame_id sr_id
,
7085 enum bptype sr_type
)
7087 /* There should never be more than one step-resume or longjmp-resume
7088 breakpoint per thread, so we should never be setting a new
7089 step_resume_breakpoint when one is already active. */
7090 gdb_assert (inferior_thread ()->control
.step_resume_breakpoint
== NULL
);
7091 gdb_assert (sr_type
== bp_step_resume
|| sr_type
== bp_hp_step_resume
);
7094 fprintf_unfiltered (gdb_stdlog
,
7095 "infrun: inserting step-resume breakpoint at %s\n",
7096 paddress (gdbarch
, sr_sal
.pc
));
7098 inferior_thread ()->control
.step_resume_breakpoint
7099 = set_momentary_breakpoint (gdbarch
, sr_sal
, sr_id
, sr_type
);
7103 insert_step_resume_breakpoint_at_sal (struct gdbarch
*gdbarch
,
7104 struct symtab_and_line sr_sal
,
7105 struct frame_id sr_id
)
7107 insert_step_resume_breakpoint_at_sal_1 (gdbarch
,
7112 /* Insert a "high-priority step-resume breakpoint" at RETURN_FRAME.pc.
7113 This is used to skip a potential signal handler.
7115 This is called with the interrupted function's frame. The signal
7116 handler, when it returns, will resume the interrupted function at
7120 insert_hp_step_resume_breakpoint_at_frame (struct frame_info
*return_frame
)
7122 struct symtab_and_line sr_sal
;
7123 struct gdbarch
*gdbarch
;
7125 gdb_assert (return_frame
!= NULL
);
7126 init_sal (&sr_sal
); /* initialize to zeros */
7128 gdbarch
= get_frame_arch (return_frame
);
7129 sr_sal
.pc
= gdbarch_addr_bits_remove (gdbarch
, get_frame_pc (return_frame
));
7130 sr_sal
.section
= find_pc_overlay (sr_sal
.pc
);
7131 sr_sal
.pspace
= get_frame_program_space (return_frame
);
7133 insert_step_resume_breakpoint_at_sal_1 (gdbarch
, sr_sal
,
7134 get_stack_frame_id (return_frame
),
7138 /* Insert a "step-resume breakpoint" at the previous frame's PC. This
7139 is used to skip a function after stepping into it (for "next" or if
7140 the called function has no debugging information).
7142 The current function has almost always been reached by single
7143 stepping a call or return instruction. NEXT_FRAME belongs to the
7144 current function, and the breakpoint will be set at the caller's
7147 This is a separate function rather than reusing
7148 insert_hp_step_resume_breakpoint_at_frame in order to avoid
7149 get_prev_frame, which may stop prematurely (see the implementation
7150 of frame_unwind_caller_id for an example). */
7153 insert_step_resume_breakpoint_at_caller (struct frame_info
*next_frame
)
7155 struct symtab_and_line sr_sal
;
7156 struct gdbarch
*gdbarch
;
7158 /* We shouldn't have gotten here if we don't know where the call site
7160 gdb_assert (frame_id_p (frame_unwind_caller_id (next_frame
)));
7162 init_sal (&sr_sal
); /* initialize to zeros */
7164 gdbarch
= frame_unwind_caller_arch (next_frame
);
7165 sr_sal
.pc
= gdbarch_addr_bits_remove (gdbarch
,
7166 frame_unwind_caller_pc (next_frame
));
7167 sr_sal
.section
= find_pc_overlay (sr_sal
.pc
);
7168 sr_sal
.pspace
= frame_unwind_program_space (next_frame
);
7170 insert_step_resume_breakpoint_at_sal (gdbarch
, sr_sal
,
7171 frame_unwind_caller_id (next_frame
));
7174 /* Insert a "longjmp-resume" breakpoint at PC. This is used to set a
7175 new breakpoint at the target of a jmp_buf. The handling of
7176 longjmp-resume uses the same mechanisms used for handling
7177 "step-resume" breakpoints. */
7180 insert_longjmp_resume_breakpoint (struct gdbarch
*gdbarch
, CORE_ADDR pc
)
7182 /* There should never be more than one longjmp-resume breakpoint per
7183 thread, so we should never be setting a new
7184 longjmp_resume_breakpoint when one is already active. */
7185 gdb_assert (inferior_thread ()->control
.exception_resume_breakpoint
== NULL
);
7188 fprintf_unfiltered (gdb_stdlog
,
7189 "infrun: inserting longjmp-resume breakpoint at %s\n",
7190 paddress (gdbarch
, pc
));
7192 inferior_thread ()->control
.exception_resume_breakpoint
=
7193 set_momentary_breakpoint_at_pc (gdbarch
, pc
, bp_longjmp_resume
);
7196 /* Insert an exception resume breakpoint. TP is the thread throwing
7197 the exception. The block B is the block of the unwinder debug hook
7198 function. FRAME is the frame corresponding to the call to this
7199 function. SYM is the symbol of the function argument holding the
7200 target PC of the exception. */
7203 insert_exception_resume_breakpoint (struct thread_info
*tp
,
7204 const struct block
*b
,
7205 struct frame_info
*frame
,
7210 struct block_symbol vsym
;
7211 struct value
*value
;
7213 struct breakpoint
*bp
;
7215 vsym
= lookup_symbol (SYMBOL_LINKAGE_NAME (sym
), b
, VAR_DOMAIN
, NULL
);
7216 value
= read_var_value (vsym
.symbol
, vsym
.block
, frame
);
7217 /* If the value was optimized out, revert to the old behavior. */
7218 if (! value_optimized_out (value
))
7220 handler
= value_as_address (value
);
7223 fprintf_unfiltered (gdb_stdlog
,
7224 "infrun: exception resume at %lx\n",
7225 (unsigned long) handler
);
7227 bp
= set_momentary_breakpoint_at_pc (get_frame_arch (frame
),
7228 handler
, bp_exception_resume
);
7230 /* set_momentary_breakpoint_at_pc invalidates FRAME. */
7233 bp
->thread
= tp
->num
;
7234 inferior_thread ()->control
.exception_resume_breakpoint
= bp
;
7237 CATCH (e
, RETURN_MASK_ERROR
)
7239 /* We want to ignore errors here. */
7244 /* A helper for check_exception_resume that sets an
7245 exception-breakpoint based on a SystemTap probe. */
7248 insert_exception_resume_from_probe (struct thread_info
*tp
,
7249 const struct bound_probe
*probe
,
7250 struct frame_info
*frame
)
7252 struct value
*arg_value
;
7254 struct breakpoint
*bp
;
7256 arg_value
= probe_safe_evaluate_at_pc (frame
, 1);
7260 handler
= value_as_address (arg_value
);
7263 fprintf_unfiltered (gdb_stdlog
,
7264 "infrun: exception resume at %s\n",
7265 paddress (get_objfile_arch (probe
->objfile
),
7268 bp
= set_momentary_breakpoint_at_pc (get_frame_arch (frame
),
7269 handler
, bp_exception_resume
);
7270 bp
->thread
= tp
->num
;
7271 inferior_thread ()->control
.exception_resume_breakpoint
= bp
;
7274 /* This is called when an exception has been intercepted. Check to
7275 see whether the exception's destination is of interest, and if so,
7276 set an exception resume breakpoint there. */
7279 check_exception_resume (struct execution_control_state
*ecs
,
7280 struct frame_info
*frame
)
7282 struct bound_probe probe
;
7283 struct symbol
*func
;
7285 /* First see if this exception unwinding breakpoint was set via a
7286 SystemTap probe point. If so, the probe has two arguments: the
7287 CFA and the HANDLER. We ignore the CFA, extract the handler, and
7288 set a breakpoint there. */
7289 probe
= find_probe_by_pc (get_frame_pc (frame
));
7292 insert_exception_resume_from_probe (ecs
->event_thread
, &probe
, frame
);
7296 func
= get_frame_function (frame
);
7302 const struct block
*b
;
7303 struct block_iterator iter
;
7307 /* The exception breakpoint is a thread-specific breakpoint on
7308 the unwinder's debug hook, declared as:
7310 void _Unwind_DebugHook (void *cfa, void *handler);
7312 The CFA argument indicates the frame to which control is
7313 about to be transferred. HANDLER is the destination PC.
7315 We ignore the CFA and set a temporary breakpoint at HANDLER.
7316 This is not extremely efficient but it avoids issues in gdb
7317 with computing the DWARF CFA, and it also works even in weird
7318 cases such as throwing an exception from inside a signal
7321 b
= SYMBOL_BLOCK_VALUE (func
);
7322 ALL_BLOCK_SYMBOLS (b
, iter
, sym
)
7324 if (!SYMBOL_IS_ARGUMENT (sym
))
7331 insert_exception_resume_breakpoint (ecs
->event_thread
,
7337 CATCH (e
, RETURN_MASK_ERROR
)
7344 stop_waiting (struct execution_control_state
*ecs
)
7347 fprintf_unfiltered (gdb_stdlog
, "infrun: stop_waiting\n");
7349 clear_step_over_info ();
7351 /* Let callers know we don't want to wait for the inferior anymore. */
7352 ecs
->wait_some_more
= 0;
7354 /* If all-stop, but the target is always in non-stop mode, stop all
7355 threads now that we're presenting the stop to the user. */
7356 if (!non_stop
&& target_is_non_stop_p ())
7357 stop_all_threads ();
7360 /* Like keep_going, but passes the signal to the inferior, even if the
7361 signal is set to nopass. */
7364 keep_going_pass_signal (struct execution_control_state
*ecs
)
7366 /* Make sure normal_stop is called if we get a QUIT handled before
7368 struct cleanup
*old_cleanups
= make_cleanup (resume_cleanups
, 0);
7370 gdb_assert (ptid_equal (ecs
->event_thread
->ptid
, inferior_ptid
));
7371 gdb_assert (!ecs
->event_thread
->resumed
);
7373 /* Save the pc before execution, to compare with pc after stop. */
7374 ecs
->event_thread
->prev_pc
7375 = regcache_read_pc (get_thread_regcache (ecs
->ptid
));
7377 if (ecs
->event_thread
->control
.trap_expected
)
7379 struct thread_info
*tp
= ecs
->event_thread
;
7382 fprintf_unfiltered (gdb_stdlog
,
7383 "infrun: %s has trap_expected set, "
7384 "resuming to collect trap\n",
7385 target_pid_to_str (tp
->ptid
));
7387 /* We haven't yet gotten our trap, and either: intercepted a
7388 non-signal event (e.g., a fork); or took a signal which we
7389 are supposed to pass through to the inferior. Simply
7391 discard_cleanups (old_cleanups
);
7392 resume (ecs
->event_thread
->suspend
.stop_signal
);
7394 else if (step_over_info_valid_p ())
7396 /* Another thread is stepping over a breakpoint in-line. If
7397 this thread needs a step-over too, queue the request. In
7398 either case, this resume must be deferred for later. */
7399 struct thread_info
*tp
= ecs
->event_thread
;
7401 if (ecs
->hit_singlestep_breakpoint
7402 || thread_still_needs_step_over (tp
))
7405 fprintf_unfiltered (gdb_stdlog
,
7406 "infrun: step-over already in progress: "
7407 "step-over for %s deferred\n",
7408 target_pid_to_str (tp
->ptid
));
7409 thread_step_over_chain_enqueue (tp
);
7414 fprintf_unfiltered (gdb_stdlog
,
7415 "infrun: step-over in progress: "
7416 "resume of %s deferred\n",
7417 target_pid_to_str (tp
->ptid
));
7420 discard_cleanups (old_cleanups
);
7424 struct regcache
*regcache
= get_current_regcache ();
7427 enum step_over_what step_what
;
7429 /* Either the trap was not expected, but we are continuing
7430 anyway (if we got a signal, the user asked it be passed to
7433 We got our expected trap, but decided we should resume from
7436 We're going to run this baby now!
7438 Note that insert_breakpoints won't try to re-insert
7439 already inserted breakpoints. Therefore, we don't
7440 care if breakpoints were already inserted, or not. */
7442 /* If we need to step over a breakpoint, and we're not using
7443 displaced stepping to do so, insert all breakpoints
7444 (watchpoints, etc.) but the one we're stepping over, step one
7445 instruction, and then re-insert the breakpoint when that step
7448 step_what
= thread_still_needs_step_over (ecs
->event_thread
);
7450 remove_bp
= (ecs
->hit_singlestep_breakpoint
7451 || (step_what
& STEP_OVER_BREAKPOINT
));
7452 remove_wps
= (step_what
& STEP_OVER_WATCHPOINT
);
7454 /* We can't use displaced stepping if we need to step past a
7455 watchpoint. The instruction copied to the scratch pad would
7456 still trigger the watchpoint. */
7458 && (remove_wps
|| !use_displaced_stepping (ecs
->event_thread
)))
7460 set_step_over_info (get_regcache_aspace (regcache
),
7461 regcache_read_pc (regcache
), remove_wps
);
7463 else if (remove_wps
)
7464 set_step_over_info (NULL
, 0, remove_wps
);
7466 /* If we now need to do an in-line step-over, we need to stop
7467 all other threads. Note this must be done before
7468 insert_breakpoints below, because that removes the breakpoint
7469 we're about to step over, otherwise other threads could miss
7471 if (step_over_info_valid_p () && target_is_non_stop_p ())
7472 stop_all_threads ();
7474 /* Stop stepping if inserting breakpoints fails. */
7477 insert_breakpoints ();
7479 CATCH (e
, RETURN_MASK_ERROR
)
7481 exception_print (gdb_stderr
, e
);
7483 discard_cleanups (old_cleanups
);
7488 ecs
->event_thread
->control
.trap_expected
= (remove_bp
|| remove_wps
);
7490 discard_cleanups (old_cleanups
);
7491 resume (ecs
->event_thread
->suspend
.stop_signal
);
7494 prepare_to_wait (ecs
);
7497 /* Called when we should continue running the inferior, because the
7498 current event doesn't cause a user visible stop. This does the
7499 resuming part; waiting for the next event is done elsewhere. */
7502 keep_going (struct execution_control_state
*ecs
)
7504 if (ecs
->event_thread
->control
.trap_expected
7505 && ecs
->event_thread
->suspend
.stop_signal
== GDB_SIGNAL_TRAP
)
7506 ecs
->event_thread
->control
.trap_expected
= 0;
7508 if (!signal_program
[ecs
->event_thread
->suspend
.stop_signal
])
7509 ecs
->event_thread
->suspend
.stop_signal
= GDB_SIGNAL_0
;
7510 keep_going_pass_signal (ecs
);
7513 /* This function normally comes after a resume, before
7514 handle_inferior_event exits. It takes care of any last bits of
7515 housekeeping, and sets the all-important wait_some_more flag. */
7518 prepare_to_wait (struct execution_control_state
*ecs
)
7521 fprintf_unfiltered (gdb_stdlog
, "infrun: prepare_to_wait\n");
7523 /* This is the old end of the while loop. Let everybody know we
7524 want to wait for the inferior some more and get called again
7526 ecs
->wait_some_more
= 1;
7529 /* We are done with the step range of a step/next/si/ni command.
7530 Called once for each n of a "step n" operation. */
7533 end_stepping_range (struct execution_control_state
*ecs
)
7535 ecs
->event_thread
->control
.stop_step
= 1;
7539 /* Several print_*_reason functions to print why the inferior has stopped.
7540 We always print something when the inferior exits, or receives a signal.
7541 The rest of the cases are dealt with later on in normal_stop and
7542 print_it_typical. Ideally there should be a call to one of these
7543 print_*_reason functions functions from handle_inferior_event each time
7544 stop_waiting is called.
7546 Note that we don't call these directly, instead we delegate that to
7547 the interpreters, through observers. Interpreters then call these
7548 with whatever uiout is right. */
7551 print_end_stepping_range_reason (struct ui_out
*uiout
)
7553 /* For CLI-like interpreters, print nothing. */
7555 if (ui_out_is_mi_like_p (uiout
))
7557 ui_out_field_string (uiout
, "reason",
7558 async_reason_lookup (EXEC_ASYNC_END_STEPPING_RANGE
));
7563 print_signal_exited_reason (struct ui_out
*uiout
, enum gdb_signal siggnal
)
7565 annotate_signalled ();
7566 if (ui_out_is_mi_like_p (uiout
))
7568 (uiout
, "reason", async_reason_lookup (EXEC_ASYNC_EXITED_SIGNALLED
));
7569 ui_out_text (uiout
, "\nProgram terminated with signal ");
7570 annotate_signal_name ();
7571 ui_out_field_string (uiout
, "signal-name",
7572 gdb_signal_to_name (siggnal
));
7573 annotate_signal_name_end ();
7574 ui_out_text (uiout
, ", ");
7575 annotate_signal_string ();
7576 ui_out_field_string (uiout
, "signal-meaning",
7577 gdb_signal_to_string (siggnal
));
7578 annotate_signal_string_end ();
7579 ui_out_text (uiout
, ".\n");
7580 ui_out_text (uiout
, "The program no longer exists.\n");
7584 print_exited_reason (struct ui_out
*uiout
, int exitstatus
)
7586 struct inferior
*inf
= current_inferior ();
7587 const char *pidstr
= target_pid_to_str (pid_to_ptid (inf
->pid
));
7589 annotate_exited (exitstatus
);
7592 if (ui_out_is_mi_like_p (uiout
))
7593 ui_out_field_string (uiout
, "reason",
7594 async_reason_lookup (EXEC_ASYNC_EXITED
));
7595 ui_out_text (uiout
, "[Inferior ");
7596 ui_out_text (uiout
, plongest (inf
->num
));
7597 ui_out_text (uiout
, " (");
7598 ui_out_text (uiout
, pidstr
);
7599 ui_out_text (uiout
, ") exited with code ");
7600 ui_out_field_fmt (uiout
, "exit-code", "0%o", (unsigned int) exitstatus
);
7601 ui_out_text (uiout
, "]\n");
7605 if (ui_out_is_mi_like_p (uiout
))
7607 (uiout
, "reason", async_reason_lookup (EXEC_ASYNC_EXITED_NORMALLY
));
7608 ui_out_text (uiout
, "[Inferior ");
7609 ui_out_text (uiout
, plongest (inf
->num
));
7610 ui_out_text (uiout
, " (");
7611 ui_out_text (uiout
, pidstr
);
7612 ui_out_text (uiout
, ") exited normally]\n");
7617 print_signal_received_reason (struct ui_out
*uiout
, enum gdb_signal siggnal
)
7621 if (siggnal
== GDB_SIGNAL_0
&& !ui_out_is_mi_like_p (uiout
))
7623 struct thread_info
*t
= inferior_thread ();
7625 ui_out_text (uiout
, "\n[");
7626 ui_out_field_string (uiout
, "thread-name",
7627 target_pid_to_str (t
->ptid
));
7628 ui_out_field_fmt (uiout
, "thread-id", "] #%d", t
->num
);
7629 ui_out_text (uiout
, " stopped");
7633 ui_out_text (uiout
, "\nProgram received signal ");
7634 annotate_signal_name ();
7635 if (ui_out_is_mi_like_p (uiout
))
7637 (uiout
, "reason", async_reason_lookup (EXEC_ASYNC_SIGNAL_RECEIVED
));
7638 ui_out_field_string (uiout
, "signal-name",
7639 gdb_signal_to_name (siggnal
));
7640 annotate_signal_name_end ();
7641 ui_out_text (uiout
, ", ");
7642 annotate_signal_string ();
7643 ui_out_field_string (uiout
, "signal-meaning",
7644 gdb_signal_to_string (siggnal
));
7645 annotate_signal_string_end ();
7647 ui_out_text (uiout
, ".\n");
7651 print_no_history_reason (struct ui_out
*uiout
)
7653 ui_out_text (uiout
, "\nNo more reverse-execution history.\n");
7656 /* Print current location without a level number, if we have changed
7657 functions or hit a breakpoint. Print source line if we have one.
7658 bpstat_print contains the logic deciding in detail what to print,
7659 based on the event(s) that just occurred. */
7662 print_stop_event (struct target_waitstatus
*ws
)
7665 enum print_what source_flag
;
7666 int do_frame_printing
= 1;
7667 struct thread_info
*tp
= inferior_thread ();
7669 bpstat_ret
= bpstat_print (tp
->control
.stop_bpstat
, ws
->kind
);
7673 /* FIXME: cagney/2002-12-01: Given that a frame ID does (or
7674 should) carry around the function and does (or should) use
7675 that when doing a frame comparison. */
7676 if (tp
->control
.stop_step
7677 && frame_id_eq (tp
->control
.step_frame_id
,
7678 get_frame_id (get_current_frame ()))
7679 && tp
->control
.step_start_function
== find_pc_function (stop_pc
))
7681 /* Finished step, just print source line. */
7682 source_flag
= SRC_LINE
;
7686 /* Print location and source line. */
7687 source_flag
= SRC_AND_LOC
;
7690 case PRINT_SRC_AND_LOC
:
7691 /* Print location and source line. */
7692 source_flag
= SRC_AND_LOC
;
7694 case PRINT_SRC_ONLY
:
7695 source_flag
= SRC_LINE
;
7698 /* Something bogus. */
7699 source_flag
= SRC_LINE
;
7700 do_frame_printing
= 0;
7703 internal_error (__FILE__
, __LINE__
, _("Unknown value."));
7706 /* The behavior of this routine with respect to the source
7708 SRC_LINE: Print only source line
7709 LOCATION: Print only location
7710 SRC_AND_LOC: Print location and source line. */
7711 if (do_frame_printing
)
7712 print_stack_frame (get_selected_frame (NULL
), 0, source_flag
, 1);
7714 /* Display the auto-display expressions. */
7718 /* Here to return control to GDB when the inferior stops for real.
7719 Print appropriate messages, remove breakpoints, give terminal our modes.
7721 STOP_PRINT_FRAME nonzero means print the executing frame
7722 (pc, function, args, file, line number and line text).
7723 BREAKPOINTS_FAILED nonzero means stop was due to error
7724 attempting to insert breakpoints. */
7729 struct target_waitstatus last
;
7731 struct cleanup
*old_chain
= make_cleanup (null_cleanup
, NULL
);
7734 get_last_target_status (&last_ptid
, &last
);
7736 /* If an exception is thrown from this point on, make sure to
7737 propagate GDB's knowledge of the executing state to the
7738 frontend/user running state. A QUIT is an easy exception to see
7739 here, so do this before any filtered output. */
7741 make_cleanup (finish_thread_state_cleanup
, &minus_one_ptid
);
7742 else if (last
.kind
== TARGET_WAITKIND_SIGNALLED
7743 || last
.kind
== TARGET_WAITKIND_EXITED
)
7745 /* On some targets, we may still have live threads in the
7746 inferior when we get a process exit event. E.g., for
7747 "checkpoint", when the current checkpoint/fork exits,
7748 linux-fork.c automatically switches to another fork from
7749 within target_mourn_inferior. */
7750 if (!ptid_equal (inferior_ptid
, null_ptid
))
7752 pid_ptid
= pid_to_ptid (ptid_get_pid (inferior_ptid
));
7753 make_cleanup (finish_thread_state_cleanup
, &pid_ptid
);
7756 else if (last
.kind
!= TARGET_WAITKIND_NO_RESUMED
)
7757 make_cleanup (finish_thread_state_cleanup
, &inferior_ptid
);
7759 /* As we're presenting a stop, and potentially removing breakpoints,
7760 update the thread list so we can tell whether there are threads
7761 running on the target. With target remote, for example, we can
7762 only learn about new threads when we explicitly update the thread
7763 list. Do this before notifying the interpreters about signal
7764 stops, end of stepping ranges, etc., so that the "new thread"
7765 output is emitted before e.g., "Program received signal FOO",
7766 instead of after. */
7767 update_thread_list ();
7769 if (last
.kind
== TARGET_WAITKIND_STOPPED
&& stopped_by_random_signal
)
7770 observer_notify_signal_received (inferior_thread ()->suspend
.stop_signal
);
7772 /* As with the notification of thread events, we want to delay
7773 notifying the user that we've switched thread context until
7774 the inferior actually stops.
7776 There's no point in saying anything if the inferior has exited.
7777 Note that SIGNALLED here means "exited with a signal", not
7778 "received a signal".
7780 Also skip saying anything in non-stop mode. In that mode, as we
7781 don't want GDB to switch threads behind the user's back, to avoid
7782 races where the user is typing a command to apply to thread x,
7783 but GDB switches to thread y before the user finishes entering
7784 the command, fetch_inferior_event installs a cleanup to restore
7785 the current thread back to the thread the user had selected right
7786 after this event is handled, so we're not really switching, only
7787 informing of a stop. */
7789 && !ptid_equal (previous_inferior_ptid
, inferior_ptid
)
7790 && target_has_execution
7791 && last
.kind
!= TARGET_WAITKIND_SIGNALLED
7792 && last
.kind
!= TARGET_WAITKIND_EXITED
7793 && last
.kind
!= TARGET_WAITKIND_NO_RESUMED
)
7795 target_terminal_ours_for_output ();
7796 printf_filtered (_("[Switching to %s]\n"),
7797 target_pid_to_str (inferior_ptid
));
7798 annotate_thread_changed ();
7799 previous_inferior_ptid
= inferior_ptid
;
7802 if (last
.kind
== TARGET_WAITKIND_NO_RESUMED
)
7804 gdb_assert (sync_execution
|| !target_can_async_p ());
7806 target_terminal_ours_for_output ();
7807 printf_filtered (_("No unwaited-for children left.\n"));
7810 /* Note: this depends on the update_thread_list call above. */
7811 if (!breakpoints_should_be_inserted_now () && target_has_execution
)
7813 if (remove_breakpoints ())
7815 target_terminal_ours_for_output ();
7816 printf_filtered (_("Cannot remove breakpoints because "
7817 "program is no longer writable.\nFurther "
7818 "execution is probably impossible.\n"));
7822 /* If an auto-display called a function and that got a signal,
7823 delete that auto-display to avoid an infinite recursion. */
7825 if (stopped_by_random_signal
)
7826 disable_current_display ();
7828 /* Notify observers if we finished a "step"-like command, etc. */
7829 if (target_has_execution
7830 && last
.kind
!= TARGET_WAITKIND_SIGNALLED
7831 && last
.kind
!= TARGET_WAITKIND_EXITED
7832 && inferior_thread ()->control
.stop_step
)
7834 /* But not if in the middle of doing a "step n" operation for
7836 if (inferior_thread ()->step_multi
)
7839 observer_notify_end_stepping_range ();
7842 target_terminal_ours ();
7843 async_enable_stdin ();
7845 /* Set the current source location. This will also happen if we
7846 display the frame below, but the current SAL will be incorrect
7847 during a user hook-stop function. */
7848 if (has_stack_frames () && !stop_stack_dummy
)
7849 set_current_sal_from_frame (get_current_frame ());
7851 /* Let the user/frontend see the threads as stopped, but defer to
7852 call_function_by_hand if the thread finished an infcall
7853 successfully. We may be e.g., evaluating a breakpoint condition.
7854 In that case, the thread had state THREAD_RUNNING before the
7855 infcall, and shall remain marked running, all without informing
7856 the user/frontend about state transition changes. */
7857 if (target_has_execution
7858 && inferior_thread ()->control
.in_infcall
7859 && stop_stack_dummy
== STOP_STACK_DUMMY
)
7860 discard_cleanups (old_chain
);
7862 do_cleanups (old_chain
);
7864 /* Look up the hook_stop and run it (CLI internally handles problem
7865 of stop_command's pre-hook not existing). */
7867 catch_errors (hook_stop_stub
, stop_command
,
7868 "Error while running hook_stop:\n", RETURN_MASK_ALL
);
7870 if (!has_stack_frames ())
7873 if (last
.kind
== TARGET_WAITKIND_SIGNALLED
7874 || last
.kind
== TARGET_WAITKIND_EXITED
)
7877 /* Select innermost stack frame - i.e., current frame is frame 0,
7878 and current location is based on that.
7879 Don't do this on return from a stack dummy routine,
7880 or if the program has exited. */
7882 if (!stop_stack_dummy
)
7884 select_frame (get_current_frame ());
7886 /* If --batch-silent is enabled then there's no need to print the current
7887 source location, and to try risks causing an error message about
7888 missing source files. */
7889 if (stop_print_frame
&& !batch_silent
)
7890 print_stop_event (&last
);
7893 if (stop_stack_dummy
== STOP_STACK_DUMMY
)
7895 /* Pop the empty frame that contains the stack dummy.
7896 This also restores inferior state prior to the call
7897 (struct infcall_suspend_state). */
7898 struct frame_info
*frame
= get_current_frame ();
7900 gdb_assert (get_frame_type (frame
) == DUMMY_FRAME
);
7902 /* frame_pop() calls reinit_frame_cache as the last thing it
7903 does which means there's currently no selected frame. We
7904 don't need to re-establish a selected frame if the dummy call
7905 returns normally, that will be done by
7906 restore_infcall_control_state. However, we do have to handle
7907 the case where the dummy call is returning after being
7908 stopped (e.g. the dummy call previously hit a breakpoint).
7909 We can't know which case we have so just always re-establish
7910 a selected frame here. */
7911 select_frame (get_current_frame ());
7915 annotate_stopped ();
7917 /* Suppress the stop observer if we're in the middle of:
7919 - a step n (n > 1), as there still more steps to be done.
7921 - a "finish" command, as the observer will be called in
7922 finish_command_continuation, so it can include the inferior
7923 function's return value.
7925 - calling an inferior function, as we pretend we inferior didn't
7926 run at all. The return value of the call is handled by the
7927 expression evaluator, through call_function_by_hand. */
7929 if (!target_has_execution
7930 || last
.kind
== TARGET_WAITKIND_SIGNALLED
7931 || last
.kind
== TARGET_WAITKIND_EXITED
7932 || last
.kind
== TARGET_WAITKIND_NO_RESUMED
7933 || (!(inferior_thread ()->step_multi
7934 && inferior_thread ()->control
.stop_step
)
7935 && !(inferior_thread ()->control
.stop_bpstat
7936 && inferior_thread ()->control
.proceed_to_finish
)
7937 && !inferior_thread ()->control
.in_infcall
))
7939 if (!ptid_equal (inferior_ptid
, null_ptid
))
7940 observer_notify_normal_stop (inferior_thread ()->control
.stop_bpstat
,
7943 observer_notify_normal_stop (NULL
, stop_print_frame
);
7946 if (target_has_execution
)
7948 if (last
.kind
!= TARGET_WAITKIND_SIGNALLED
7949 && last
.kind
!= TARGET_WAITKIND_EXITED
)
7950 /* Delete the breakpoint we stopped at, if it wants to be deleted.
7951 Delete any breakpoint that is to be deleted at the next stop. */
7952 breakpoint_auto_delete (inferior_thread ()->control
.stop_bpstat
);
7955 /* Try to get rid of automatically added inferiors that are no
7956 longer needed. Keeping those around slows down things linearly.
7957 Note that this never removes the current inferior. */
7962 hook_stop_stub (void *cmd
)
7964 execute_cmd_pre_hook ((struct cmd_list_element
*) cmd
);
7969 signal_stop_state (int signo
)
7971 return signal_stop
[signo
];
7975 signal_print_state (int signo
)
7977 return signal_print
[signo
];
7981 signal_pass_state (int signo
)
7983 return signal_program
[signo
];
7987 signal_cache_update (int signo
)
7991 for (signo
= 0; signo
< (int) GDB_SIGNAL_LAST
; signo
++)
7992 signal_cache_update (signo
);
7997 signal_pass
[signo
] = (signal_stop
[signo
] == 0
7998 && signal_print
[signo
] == 0
7999 && signal_program
[signo
] == 1
8000 && signal_catch
[signo
] == 0);
8004 signal_stop_update (int signo
, int state
)
8006 int ret
= signal_stop
[signo
];
8008 signal_stop
[signo
] = state
;
8009 signal_cache_update (signo
);
8014 signal_print_update (int signo
, int state
)
8016 int ret
= signal_print
[signo
];
8018 signal_print
[signo
] = state
;
8019 signal_cache_update (signo
);
8024 signal_pass_update (int signo
, int state
)
8026 int ret
= signal_program
[signo
];
8028 signal_program
[signo
] = state
;
8029 signal_cache_update (signo
);
8033 /* Update the global 'signal_catch' from INFO and notify the
8037 signal_catch_update (const unsigned int *info
)
8041 for (i
= 0; i
< GDB_SIGNAL_LAST
; ++i
)
8042 signal_catch
[i
] = info
[i
] > 0;
8043 signal_cache_update (-1);
8044 target_pass_signals ((int) GDB_SIGNAL_LAST
, signal_pass
);
8048 sig_print_header (void)
8050 printf_filtered (_("Signal Stop\tPrint\tPass "
8051 "to program\tDescription\n"));
8055 sig_print_info (enum gdb_signal oursig
)
8057 const char *name
= gdb_signal_to_name (oursig
);
8058 int name_padding
= 13 - strlen (name
);
8060 if (name_padding
<= 0)
8063 printf_filtered ("%s", name
);
8064 printf_filtered ("%*.*s ", name_padding
, name_padding
, " ");
8065 printf_filtered ("%s\t", signal_stop
[oursig
] ? "Yes" : "No");
8066 printf_filtered ("%s\t", signal_print
[oursig
] ? "Yes" : "No");
8067 printf_filtered ("%s\t\t", signal_program
[oursig
] ? "Yes" : "No");
8068 printf_filtered ("%s\n", gdb_signal_to_string (oursig
));
8071 /* Specify how various signals in the inferior should be handled. */
8074 handle_command (char *args
, int from_tty
)
8077 int digits
, wordlen
;
8078 int sigfirst
, signum
, siglast
;
8079 enum gdb_signal oursig
;
8082 unsigned char *sigs
;
8083 struct cleanup
*old_chain
;
8087 error_no_arg (_("signal to handle"));
8090 /* Allocate and zero an array of flags for which signals to handle. */
8092 nsigs
= (int) GDB_SIGNAL_LAST
;
8093 sigs
= (unsigned char *) alloca (nsigs
);
8094 memset (sigs
, 0, nsigs
);
8096 /* Break the command line up into args. */
8098 argv
= gdb_buildargv (args
);
8099 old_chain
= make_cleanup_freeargv (argv
);
8101 /* Walk through the args, looking for signal oursigs, signal names, and
8102 actions. Signal numbers and signal names may be interspersed with
8103 actions, with the actions being performed for all signals cumulatively
8104 specified. Signal ranges can be specified as <LOW>-<HIGH>. */
8106 while (*argv
!= NULL
)
8108 wordlen
= strlen (*argv
);
8109 for (digits
= 0; isdigit ((*argv
)[digits
]); digits
++)
8113 sigfirst
= siglast
= -1;
8115 if (wordlen
>= 1 && !strncmp (*argv
, "all", wordlen
))
8117 /* Apply action to all signals except those used by the
8118 debugger. Silently skip those. */
8121 siglast
= nsigs
- 1;
8123 else if (wordlen
>= 1 && !strncmp (*argv
, "stop", wordlen
))
8125 SET_SIGS (nsigs
, sigs
, signal_stop
);
8126 SET_SIGS (nsigs
, sigs
, signal_print
);
8128 else if (wordlen
>= 1 && !strncmp (*argv
, "ignore", wordlen
))
8130 UNSET_SIGS (nsigs
, sigs
, signal_program
);
8132 else if (wordlen
>= 2 && !strncmp (*argv
, "print", wordlen
))
8134 SET_SIGS (nsigs
, sigs
, signal_print
);
8136 else if (wordlen
>= 2 && !strncmp (*argv
, "pass", wordlen
))
8138 SET_SIGS (nsigs
, sigs
, signal_program
);
8140 else if (wordlen
>= 3 && !strncmp (*argv
, "nostop", wordlen
))
8142 UNSET_SIGS (nsigs
, sigs
, signal_stop
);
8144 else if (wordlen
>= 3 && !strncmp (*argv
, "noignore", wordlen
))
8146 SET_SIGS (nsigs
, sigs
, signal_program
);
8148 else if (wordlen
>= 4 && !strncmp (*argv
, "noprint", wordlen
))
8150 UNSET_SIGS (nsigs
, sigs
, signal_print
);
8151 UNSET_SIGS (nsigs
, sigs
, signal_stop
);
8153 else if (wordlen
>= 4 && !strncmp (*argv
, "nopass", wordlen
))
8155 UNSET_SIGS (nsigs
, sigs
, signal_program
);
8157 else if (digits
> 0)
8159 /* It is numeric. The numeric signal refers to our own
8160 internal signal numbering from target.h, not to host/target
8161 signal number. This is a feature; users really should be
8162 using symbolic names anyway, and the common ones like
8163 SIGHUP, SIGINT, SIGALRM, etc. will work right anyway. */
8165 sigfirst
= siglast
= (int)
8166 gdb_signal_from_command (atoi (*argv
));
8167 if ((*argv
)[digits
] == '-')
8170 gdb_signal_from_command (atoi ((*argv
) + digits
+ 1));
8172 if (sigfirst
> siglast
)
8174 /* Bet he didn't figure we'd think of this case... */
8182 oursig
= gdb_signal_from_name (*argv
);
8183 if (oursig
!= GDB_SIGNAL_UNKNOWN
)
8185 sigfirst
= siglast
= (int) oursig
;
8189 /* Not a number and not a recognized flag word => complain. */
8190 error (_("Unrecognized or ambiguous flag word: \"%s\"."), *argv
);
8194 /* If any signal numbers or symbol names were found, set flags for
8195 which signals to apply actions to. */
8197 for (signum
= sigfirst
; signum
>= 0 && signum
<= siglast
; signum
++)
8199 switch ((enum gdb_signal
) signum
)
8201 case GDB_SIGNAL_TRAP
:
8202 case GDB_SIGNAL_INT
:
8203 if (!allsigs
&& !sigs
[signum
])
8205 if (query (_("%s is used by the debugger.\n\
8206 Are you sure you want to change it? "),
8207 gdb_signal_to_name ((enum gdb_signal
) signum
)))
8213 printf_unfiltered (_("Not confirmed, unchanged.\n"));
8214 gdb_flush (gdb_stdout
);
8219 case GDB_SIGNAL_DEFAULT
:
8220 case GDB_SIGNAL_UNKNOWN
:
8221 /* Make sure that "all" doesn't print these. */
8232 for (signum
= 0; signum
< nsigs
; signum
++)
8235 signal_cache_update (-1);
8236 target_pass_signals ((int) GDB_SIGNAL_LAST
, signal_pass
);
8237 target_program_signals ((int) GDB_SIGNAL_LAST
, signal_program
);
8241 /* Show the results. */
8242 sig_print_header ();
8243 for (; signum
< nsigs
; signum
++)
8245 sig_print_info ((enum gdb_signal
) signum
);
8251 do_cleanups (old_chain
);
8254 /* Complete the "handle" command. */
8256 static VEC (char_ptr
) *
8257 handle_completer (struct cmd_list_element
*ignore
,
8258 const char *text
, const char *word
)
8260 VEC (char_ptr
) *vec_signals
, *vec_keywords
, *return_val
;
8261 static const char * const keywords
[] =
8275 vec_signals
= signal_completer (ignore
, text
, word
);
8276 vec_keywords
= complete_on_enum (keywords
, word
, word
);
8278 return_val
= VEC_merge (char_ptr
, vec_signals
, vec_keywords
);
8279 VEC_free (char_ptr
, vec_signals
);
8280 VEC_free (char_ptr
, vec_keywords
);
8285 gdb_signal_from_command (int num
)
8287 if (num
>= 1 && num
<= 15)
8288 return (enum gdb_signal
) num
;
8289 error (_("Only signals 1-15 are valid as numeric signals.\n\
8290 Use \"info signals\" for a list of symbolic signals."));
8293 /* Print current contents of the tables set by the handle command.
8294 It is possible we should just be printing signals actually used
8295 by the current target (but for things to work right when switching
8296 targets, all signals should be in the signal tables). */
8299 signals_info (char *signum_exp
, int from_tty
)
8301 enum gdb_signal oursig
;
8303 sig_print_header ();
8307 /* First see if this is a symbol name. */
8308 oursig
= gdb_signal_from_name (signum_exp
);
8309 if (oursig
== GDB_SIGNAL_UNKNOWN
)
8311 /* No, try numeric. */
8313 gdb_signal_from_command (parse_and_eval_long (signum_exp
));
8315 sig_print_info (oursig
);
8319 printf_filtered ("\n");
8320 /* These ugly casts brought to you by the native VAX compiler. */
8321 for (oursig
= GDB_SIGNAL_FIRST
;
8322 (int) oursig
< (int) GDB_SIGNAL_LAST
;
8323 oursig
= (enum gdb_signal
) ((int) oursig
+ 1))
8327 if (oursig
!= GDB_SIGNAL_UNKNOWN
8328 && oursig
!= GDB_SIGNAL_DEFAULT
&& oursig
!= GDB_SIGNAL_0
)
8329 sig_print_info (oursig
);
8332 printf_filtered (_("\nUse the \"handle\" command "
8333 "to change these tables.\n"));
8336 /* Check if it makes sense to read $_siginfo from the current thread
8337 at this point. If not, throw an error. */
8340 validate_siginfo_access (void)
8342 /* No current inferior, no siginfo. */
8343 if (ptid_equal (inferior_ptid
, null_ptid
))
8344 error (_("No thread selected."));
8346 /* Don't try to read from a dead thread. */
8347 if (is_exited (inferior_ptid
))
8348 error (_("The current thread has terminated"));
8350 /* ... or from a spinning thread. */
8351 if (is_running (inferior_ptid
))
8352 error (_("Selected thread is running."));
8355 /* The $_siginfo convenience variable is a bit special. We don't know
8356 for sure the type of the value until we actually have a chance to
8357 fetch the data. The type can change depending on gdbarch, so it is
8358 also dependent on which thread you have selected.
8360 1. making $_siginfo be an internalvar that creates a new value on
8363 2. making the value of $_siginfo be an lval_computed value. */
8365 /* This function implements the lval_computed support for reading a
8369 siginfo_value_read (struct value
*v
)
8371 LONGEST transferred
;
8373 validate_siginfo_access ();
8376 target_read (¤t_target
, TARGET_OBJECT_SIGNAL_INFO
,
8378 value_contents_all_raw (v
),
8380 TYPE_LENGTH (value_type (v
)));
8382 if (transferred
!= TYPE_LENGTH (value_type (v
)))
8383 error (_("Unable to read siginfo"));
8386 /* This function implements the lval_computed support for writing a
8390 siginfo_value_write (struct value
*v
, struct value
*fromval
)
8392 LONGEST transferred
;
8394 validate_siginfo_access ();
8396 transferred
= target_write (¤t_target
,
8397 TARGET_OBJECT_SIGNAL_INFO
,
8399 value_contents_all_raw (fromval
),
8401 TYPE_LENGTH (value_type (fromval
)));
8403 if (transferred
!= TYPE_LENGTH (value_type (fromval
)))
8404 error (_("Unable to write siginfo"));
8407 static const struct lval_funcs siginfo_value_funcs
=
8413 /* Return a new value with the correct type for the siginfo object of
8414 the current thread using architecture GDBARCH. Return a void value
8415 if there's no object available. */
8417 static struct value
*
8418 siginfo_make_value (struct gdbarch
*gdbarch
, struct internalvar
*var
,
8421 if (target_has_stack
8422 && !ptid_equal (inferior_ptid
, null_ptid
)
8423 && gdbarch_get_siginfo_type_p (gdbarch
))
8425 struct type
*type
= gdbarch_get_siginfo_type (gdbarch
);
8427 return allocate_computed_value (type
, &siginfo_value_funcs
, NULL
);
8430 return allocate_value (builtin_type (gdbarch
)->builtin_void
);
8434 /* infcall_suspend_state contains state about the program itself like its
8435 registers and any signal it received when it last stopped.
8436 This state must be restored regardless of how the inferior function call
8437 ends (either successfully, or after it hits a breakpoint or signal)
8438 if the program is to properly continue where it left off. */
8440 struct infcall_suspend_state
8442 struct thread_suspend_state thread_suspend
;
8446 struct regcache
*registers
;
8448 /* Format of SIGINFO_DATA or NULL if it is not present. */
8449 struct gdbarch
*siginfo_gdbarch
;
8451 /* The inferior format depends on SIGINFO_GDBARCH and it has a length of
8452 TYPE_LENGTH (gdbarch_get_siginfo_type ()). For different gdbarch the
8453 content would be invalid. */
8454 gdb_byte
*siginfo_data
;
8457 struct infcall_suspend_state
*
8458 save_infcall_suspend_state (void)
8460 struct infcall_suspend_state
*inf_state
;
8461 struct thread_info
*tp
= inferior_thread ();
8462 struct regcache
*regcache
= get_current_regcache ();
8463 struct gdbarch
*gdbarch
= get_regcache_arch (regcache
);
8464 gdb_byte
*siginfo_data
= NULL
;
8466 if (gdbarch_get_siginfo_type_p (gdbarch
))
8468 struct type
*type
= gdbarch_get_siginfo_type (gdbarch
);
8469 size_t len
= TYPE_LENGTH (type
);
8470 struct cleanup
*back_to
;
8472 siginfo_data
= xmalloc (len
);
8473 back_to
= make_cleanup (xfree
, siginfo_data
);
8475 if (target_read (¤t_target
, TARGET_OBJECT_SIGNAL_INFO
, NULL
,
8476 siginfo_data
, 0, len
) == len
)
8477 discard_cleanups (back_to
);
8480 /* Errors ignored. */
8481 do_cleanups (back_to
);
8482 siginfo_data
= NULL
;
8486 inf_state
= XCNEW (struct infcall_suspend_state
);
8490 inf_state
->siginfo_gdbarch
= gdbarch
;
8491 inf_state
->siginfo_data
= siginfo_data
;
8494 inf_state
->thread_suspend
= tp
->suspend
;
8496 /* run_inferior_call will not use the signal due to its `proceed' call with
8497 GDB_SIGNAL_0 anyway. */
8498 tp
->suspend
.stop_signal
= GDB_SIGNAL_0
;
8500 inf_state
->stop_pc
= stop_pc
;
8502 inf_state
->registers
= regcache_dup (regcache
);
8507 /* Restore inferior session state to INF_STATE. */
8510 restore_infcall_suspend_state (struct infcall_suspend_state
*inf_state
)
8512 struct thread_info
*tp
= inferior_thread ();
8513 struct regcache
*regcache
= get_current_regcache ();
8514 struct gdbarch
*gdbarch
= get_regcache_arch (regcache
);
8516 tp
->suspend
= inf_state
->thread_suspend
;
8518 stop_pc
= inf_state
->stop_pc
;
8520 if (inf_state
->siginfo_gdbarch
== gdbarch
)
8522 struct type
*type
= gdbarch_get_siginfo_type (gdbarch
);
8524 /* Errors ignored. */
8525 target_write (¤t_target
, TARGET_OBJECT_SIGNAL_INFO
, NULL
,
8526 inf_state
->siginfo_data
, 0, TYPE_LENGTH (type
));
8529 /* The inferior can be gone if the user types "print exit(0)"
8530 (and perhaps other times). */
8531 if (target_has_execution
)
8532 /* NB: The register write goes through to the target. */
8533 regcache_cpy (regcache
, inf_state
->registers
);
8535 discard_infcall_suspend_state (inf_state
);
8539 do_restore_infcall_suspend_state_cleanup (void *state
)
8541 restore_infcall_suspend_state (state
);
8545 make_cleanup_restore_infcall_suspend_state
8546 (struct infcall_suspend_state
*inf_state
)
8548 return make_cleanup (do_restore_infcall_suspend_state_cleanup
, inf_state
);
8552 discard_infcall_suspend_state (struct infcall_suspend_state
*inf_state
)
8554 regcache_xfree (inf_state
->registers
);
8555 xfree (inf_state
->siginfo_data
);
8560 get_infcall_suspend_state_regcache (struct infcall_suspend_state
*inf_state
)
8562 return inf_state
->registers
;
8565 /* infcall_control_state contains state regarding gdb's control of the
8566 inferior itself like stepping control. It also contains session state like
8567 the user's currently selected frame. */
8569 struct infcall_control_state
8571 struct thread_control_state thread_control
;
8572 struct inferior_control_state inferior_control
;
8575 enum stop_stack_kind stop_stack_dummy
;
8576 int stopped_by_random_signal
;
8577 int stop_after_trap
;
8579 /* ID if the selected frame when the inferior function call was made. */
8580 struct frame_id selected_frame_id
;
8583 /* Save all of the information associated with the inferior<==>gdb
8586 struct infcall_control_state
*
8587 save_infcall_control_state (void)
8589 struct infcall_control_state
*inf_status
= xmalloc (sizeof (*inf_status
));
8590 struct thread_info
*tp
= inferior_thread ();
8591 struct inferior
*inf
= current_inferior ();
8593 inf_status
->thread_control
= tp
->control
;
8594 inf_status
->inferior_control
= inf
->control
;
8596 tp
->control
.step_resume_breakpoint
= NULL
;
8597 tp
->control
.exception_resume_breakpoint
= NULL
;
8599 /* Save original bpstat chain to INF_STATUS; replace it in TP with copy of
8600 chain. If caller's caller is walking the chain, they'll be happier if we
8601 hand them back the original chain when restore_infcall_control_state is
8603 tp
->control
.stop_bpstat
= bpstat_copy (tp
->control
.stop_bpstat
);
8606 inf_status
->stop_stack_dummy
= stop_stack_dummy
;
8607 inf_status
->stopped_by_random_signal
= stopped_by_random_signal
;
8608 inf_status
->stop_after_trap
= stop_after_trap
;
8610 inf_status
->selected_frame_id
= get_frame_id (get_selected_frame (NULL
));
8616 restore_selected_frame (void *args
)
8618 struct frame_id
*fid
= (struct frame_id
*) args
;
8619 struct frame_info
*frame
;
8621 frame
= frame_find_by_id (*fid
);
8623 /* If inf_status->selected_frame_id is NULL, there was no previously
8627 warning (_("Unable to restore previously selected frame."));
8631 select_frame (frame
);
8636 /* Restore inferior session state to INF_STATUS. */
8639 restore_infcall_control_state (struct infcall_control_state
*inf_status
)
8641 struct thread_info
*tp
= inferior_thread ();
8642 struct inferior
*inf
= current_inferior ();
8644 if (tp
->control
.step_resume_breakpoint
)
8645 tp
->control
.step_resume_breakpoint
->disposition
= disp_del_at_next_stop
;
8647 if (tp
->control
.exception_resume_breakpoint
)
8648 tp
->control
.exception_resume_breakpoint
->disposition
8649 = disp_del_at_next_stop
;
8651 /* Handle the bpstat_copy of the chain. */
8652 bpstat_clear (&tp
->control
.stop_bpstat
);
8654 tp
->control
= inf_status
->thread_control
;
8655 inf
->control
= inf_status
->inferior_control
;
8658 stop_stack_dummy
= inf_status
->stop_stack_dummy
;
8659 stopped_by_random_signal
= inf_status
->stopped_by_random_signal
;
8660 stop_after_trap
= inf_status
->stop_after_trap
;
8662 if (target_has_stack
)
8664 /* The point of catch_errors is that if the stack is clobbered,
8665 walking the stack might encounter a garbage pointer and
8666 error() trying to dereference it. */
8668 (restore_selected_frame
, &inf_status
->selected_frame_id
,
8669 "Unable to restore previously selected frame:\n",
8670 RETURN_MASK_ERROR
) == 0)
8671 /* Error in restoring the selected frame. Select the innermost
8673 select_frame (get_current_frame ());
8680 do_restore_infcall_control_state_cleanup (void *sts
)
8682 restore_infcall_control_state (sts
);
8686 make_cleanup_restore_infcall_control_state
8687 (struct infcall_control_state
*inf_status
)
8689 return make_cleanup (do_restore_infcall_control_state_cleanup
, inf_status
);
8693 discard_infcall_control_state (struct infcall_control_state
*inf_status
)
8695 if (inf_status
->thread_control
.step_resume_breakpoint
)
8696 inf_status
->thread_control
.step_resume_breakpoint
->disposition
8697 = disp_del_at_next_stop
;
8699 if (inf_status
->thread_control
.exception_resume_breakpoint
)
8700 inf_status
->thread_control
.exception_resume_breakpoint
->disposition
8701 = disp_del_at_next_stop
;
8703 /* See save_infcall_control_state for info on stop_bpstat. */
8704 bpstat_clear (&inf_status
->thread_control
.stop_bpstat
);
8709 /* restore_inferior_ptid() will be used by the cleanup machinery
8710 to restore the inferior_ptid value saved in a call to
8711 save_inferior_ptid(). */
8714 restore_inferior_ptid (void *arg
)
8716 ptid_t
*saved_ptid_ptr
= arg
;
8718 inferior_ptid
= *saved_ptid_ptr
;
8722 /* Save the value of inferior_ptid so that it may be restored by a
8723 later call to do_cleanups(). Returns the struct cleanup pointer
8724 needed for later doing the cleanup. */
8727 save_inferior_ptid (void)
8729 ptid_t
*saved_ptid_ptr
;
8731 saved_ptid_ptr
= xmalloc (sizeof (ptid_t
));
8732 *saved_ptid_ptr
= inferior_ptid
;
8733 return make_cleanup (restore_inferior_ptid
, saved_ptid_ptr
);
8739 clear_exit_convenience_vars (void)
8741 clear_internalvar (lookup_internalvar ("_exitsignal"));
8742 clear_internalvar (lookup_internalvar ("_exitcode"));
8746 /* User interface for reverse debugging:
8747 Set exec-direction / show exec-direction commands
8748 (returns error unless target implements to_set_exec_direction method). */
8750 int execution_direction
= EXEC_FORWARD
;
8751 static const char exec_forward
[] = "forward";
8752 static const char exec_reverse
[] = "reverse";
8753 static const char *exec_direction
= exec_forward
;
8754 static const char *const exec_direction_names
[] = {
8761 set_exec_direction_func (char *args
, int from_tty
,
8762 struct cmd_list_element
*cmd
)
8764 if (target_can_execute_reverse
)
8766 if (!strcmp (exec_direction
, exec_forward
))
8767 execution_direction
= EXEC_FORWARD
;
8768 else if (!strcmp (exec_direction
, exec_reverse
))
8769 execution_direction
= EXEC_REVERSE
;
8773 exec_direction
= exec_forward
;
8774 error (_("Target does not support this operation."));
8779 show_exec_direction_func (struct ui_file
*out
, int from_tty
,
8780 struct cmd_list_element
*cmd
, const char *value
)
8782 switch (execution_direction
) {
8784 fprintf_filtered (out
, _("Forward.\n"));
8787 fprintf_filtered (out
, _("Reverse.\n"));
8790 internal_error (__FILE__
, __LINE__
,
8791 _("bogus execution_direction value: %d"),
8792 (int) execution_direction
);
8797 show_schedule_multiple (struct ui_file
*file
, int from_tty
,
8798 struct cmd_list_element
*c
, const char *value
)
8800 fprintf_filtered (file
, _("Resuming the execution of threads "
8801 "of all processes is %s.\n"), value
);
8804 /* Implementation of `siginfo' variable. */
8806 static const struct internalvar_funcs siginfo_funcs
=
8813 /* Callback for infrun's target events source. This is marked when a
8814 thread has a pending status to process. */
8817 infrun_async_inferior_event_handler (gdb_client_data data
)
8819 /* If the target is closed while this event source is marked, we
8820 will reach here without execution, or a target to call
8821 target_wait on, which is an error. Instead of tracking whether
8822 the target has been popped already, or whether we do have threads
8823 with pending statutes, simply ignore the event. */
8824 if (!target_is_async_p ())
8827 inferior_event_handler (INF_REG_EVENT
, NULL
);
8831 _initialize_infrun (void)
8835 struct cmd_list_element
*c
;
8837 /* Register extra event sources in the event loop. */
8838 infrun_async_inferior_event_token
8839 = create_async_event_handler (infrun_async_inferior_event_handler
, NULL
);
8841 add_info ("signals", signals_info
, _("\
8842 What debugger does when program gets various signals.\n\
8843 Specify a signal as argument to print info on that signal only."));
8844 add_info_alias ("handle", "signals", 0);
8846 c
= add_com ("handle", class_run
, handle_command
, _("\
8847 Specify how to handle signals.\n\
8848 Usage: handle SIGNAL [ACTIONS]\n\
8849 Args are signals and actions to apply to those signals.\n\
8850 If no actions are specified, the current settings for the specified signals\n\
8851 will be displayed instead.\n\
8853 Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\
8854 from 1-15 are allowed for compatibility with old versions of GDB.\n\
8855 Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\
8856 The special arg \"all\" is recognized to mean all signals except those\n\
8857 used by the debugger, typically SIGTRAP and SIGINT.\n\
8859 Recognized actions include \"stop\", \"nostop\", \"print\", \"noprint\",\n\
8860 \"pass\", \"nopass\", \"ignore\", or \"noignore\".\n\
8861 Stop means reenter debugger if this signal happens (implies print).\n\
8862 Print means print a message if this signal happens.\n\
8863 Pass means let program see this signal; otherwise program doesn't know.\n\
8864 Ignore is a synonym for nopass and noignore is a synonym for pass.\n\
8865 Pass and Stop may be combined.\n\
8867 Multiple signals may be specified. Signal numbers and signal names\n\
8868 may be interspersed with actions, with the actions being performed for\n\
8869 all signals cumulatively specified."));
8870 set_cmd_completer (c
, handle_completer
);
8873 stop_command
= add_cmd ("stop", class_obscure
,
8874 not_just_help_class_command
, _("\
8875 There is no `stop' command, but you can set a hook on `stop'.\n\
8876 This allows you to set a list of commands to be run each time execution\n\
8877 of the program stops."), &cmdlist
);
8879 add_setshow_zuinteger_cmd ("infrun", class_maintenance
, &debug_infrun
, _("\
8880 Set inferior debugging."), _("\
8881 Show inferior debugging."), _("\
8882 When non-zero, inferior specific debugging is enabled."),
8885 &setdebuglist
, &showdebuglist
);
8887 add_setshow_boolean_cmd ("displaced", class_maintenance
,
8888 &debug_displaced
, _("\
8889 Set displaced stepping debugging."), _("\
8890 Show displaced stepping debugging."), _("\
8891 When non-zero, displaced stepping specific debugging is enabled."),
8893 show_debug_displaced
,
8894 &setdebuglist
, &showdebuglist
);
8896 add_setshow_boolean_cmd ("non-stop", no_class
,
8898 Set whether gdb controls the inferior in non-stop mode."), _("\
8899 Show whether gdb controls the inferior in non-stop mode."), _("\
8900 When debugging a multi-threaded program and this setting is\n\
8901 off (the default, also called all-stop mode), when one thread stops\n\
8902 (for a breakpoint, watchpoint, exception, or similar events), GDB stops\n\
8903 all other threads in the program while you interact with the thread of\n\
8904 interest. When you continue or step a thread, you can allow the other\n\
8905 threads to run, or have them remain stopped, but while you inspect any\n\
8906 thread's state, all threads stop.\n\
8908 In non-stop mode, when one thread stops, other threads can continue\n\
8909 to run freely. You'll be able to step each thread independently,\n\
8910 leave it stopped or free to run as needed."),
8916 numsigs
= (int) GDB_SIGNAL_LAST
;
8917 signal_stop
= (unsigned char *) xmalloc (sizeof (signal_stop
[0]) * numsigs
);
8918 signal_print
= (unsigned char *)
8919 xmalloc (sizeof (signal_print
[0]) * numsigs
);
8920 signal_program
= (unsigned char *)
8921 xmalloc (sizeof (signal_program
[0]) * numsigs
);
8922 signal_catch
= (unsigned char *)
8923 xmalloc (sizeof (signal_catch
[0]) * numsigs
);
8924 signal_pass
= (unsigned char *)
8925 xmalloc (sizeof (signal_pass
[0]) * numsigs
);
8926 for (i
= 0; i
< numsigs
; i
++)
8929 signal_print
[i
] = 1;
8930 signal_program
[i
] = 1;
8931 signal_catch
[i
] = 0;
8934 /* Signals caused by debugger's own actions should not be given to
8935 the program afterwards.
8937 Do not deliver GDB_SIGNAL_TRAP by default, except when the user
8938 explicitly specifies that it should be delivered to the target
8939 program. Typically, that would occur when a user is debugging a
8940 target monitor on a simulator: the target monitor sets a
8941 breakpoint; the simulator encounters this breakpoint and halts
8942 the simulation handing control to GDB; GDB, noting that the stop
8943 address doesn't map to any known breakpoint, returns control back
8944 to the simulator; the simulator then delivers the hardware
8945 equivalent of a GDB_SIGNAL_TRAP to the program being
8947 signal_program
[GDB_SIGNAL_TRAP
] = 0;
8948 signal_program
[GDB_SIGNAL_INT
] = 0;
8950 /* Signals that are not errors should not normally enter the debugger. */
8951 signal_stop
[GDB_SIGNAL_ALRM
] = 0;
8952 signal_print
[GDB_SIGNAL_ALRM
] = 0;
8953 signal_stop
[GDB_SIGNAL_VTALRM
] = 0;
8954 signal_print
[GDB_SIGNAL_VTALRM
] = 0;
8955 signal_stop
[GDB_SIGNAL_PROF
] = 0;
8956 signal_print
[GDB_SIGNAL_PROF
] = 0;
8957 signal_stop
[GDB_SIGNAL_CHLD
] = 0;
8958 signal_print
[GDB_SIGNAL_CHLD
] = 0;
8959 signal_stop
[GDB_SIGNAL_IO
] = 0;
8960 signal_print
[GDB_SIGNAL_IO
] = 0;
8961 signal_stop
[GDB_SIGNAL_POLL
] = 0;
8962 signal_print
[GDB_SIGNAL_POLL
] = 0;
8963 signal_stop
[GDB_SIGNAL_URG
] = 0;
8964 signal_print
[GDB_SIGNAL_URG
] = 0;
8965 signal_stop
[GDB_SIGNAL_WINCH
] = 0;
8966 signal_print
[GDB_SIGNAL_WINCH
] = 0;
8967 signal_stop
[GDB_SIGNAL_PRIO
] = 0;
8968 signal_print
[GDB_SIGNAL_PRIO
] = 0;
8970 /* These signals are used internally by user-level thread
8971 implementations. (See signal(5) on Solaris.) Like the above
8972 signals, a healthy program receives and handles them as part of
8973 its normal operation. */
8974 signal_stop
[GDB_SIGNAL_LWP
] = 0;
8975 signal_print
[GDB_SIGNAL_LWP
] = 0;
8976 signal_stop
[GDB_SIGNAL_WAITING
] = 0;
8977 signal_print
[GDB_SIGNAL_WAITING
] = 0;
8978 signal_stop
[GDB_SIGNAL_CANCEL
] = 0;
8979 signal_print
[GDB_SIGNAL_CANCEL
] = 0;
8981 /* Update cached state. */
8982 signal_cache_update (-1);
8984 add_setshow_zinteger_cmd ("stop-on-solib-events", class_support
,
8985 &stop_on_solib_events
, _("\
8986 Set stopping for shared library events."), _("\
8987 Show stopping for shared library events."), _("\
8988 If nonzero, gdb will give control to the user when the dynamic linker\n\
8989 notifies gdb of shared library events. The most common event of interest\n\
8990 to the user would be loading/unloading of a new library."),
8991 set_stop_on_solib_events
,
8992 show_stop_on_solib_events
,
8993 &setlist
, &showlist
);
8995 add_setshow_enum_cmd ("follow-fork-mode", class_run
,
8996 follow_fork_mode_kind_names
,
8997 &follow_fork_mode_string
, _("\
8998 Set debugger response to a program call of fork or vfork."), _("\
8999 Show debugger response to a program call of fork or vfork."), _("\
9000 A fork or vfork creates a new process. follow-fork-mode can be:\n\
9001 parent - the original process is debugged after a fork\n\
9002 child - the new process is debugged after a fork\n\
9003 The unfollowed process will continue to run.\n\
9004 By default, the debugger will follow the parent process."),
9006 show_follow_fork_mode_string
,
9007 &setlist
, &showlist
);
9009 add_setshow_enum_cmd ("follow-exec-mode", class_run
,
9010 follow_exec_mode_names
,
9011 &follow_exec_mode_string
, _("\
9012 Set debugger response to a program call of exec."), _("\
9013 Show debugger response to a program call of exec."), _("\
9014 An exec call replaces the program image of a process.\n\
9016 follow-exec-mode can be:\n\
9018 new - the debugger creates a new inferior and rebinds the process\n\
9019 to this new inferior. The program the process was running before\n\
9020 the exec call can be restarted afterwards by restarting the original\n\
9023 same - the debugger keeps the process bound to the same inferior.\n\
9024 The new executable image replaces the previous executable loaded in\n\
9025 the inferior. Restarting the inferior after the exec call restarts\n\
9026 the executable the process was running after the exec call.\n\
9028 By default, the debugger will use the same inferior."),
9030 show_follow_exec_mode_string
,
9031 &setlist
, &showlist
);
9033 add_setshow_enum_cmd ("scheduler-locking", class_run
,
9034 scheduler_enums
, &scheduler_mode
, _("\
9035 Set mode for locking scheduler during execution."), _("\
9036 Show mode for locking scheduler during execution."), _("\
9037 off == no locking (threads may preempt at any time)\n\
9038 on == full locking (no thread except the current thread may run)\n\
9039 step == scheduler locked during stepping commands (step, next, stepi, nexti).\n\
9040 In this mode, other threads may run during other commands."),
9041 set_schedlock_func
, /* traps on target vector */
9042 show_scheduler_mode
,
9043 &setlist
, &showlist
);
9045 add_setshow_boolean_cmd ("schedule-multiple", class_run
, &sched_multi
, _("\
9046 Set mode for resuming threads of all processes."), _("\
9047 Show mode for resuming threads of all processes."), _("\
9048 When on, execution commands (such as 'continue' or 'next') resume all\n\
9049 threads of all processes. When off (which is the default), execution\n\
9050 commands only resume the threads of the current process. The set of\n\
9051 threads that are resumed is further refined by the scheduler-locking\n\
9052 mode (see help set scheduler-locking)."),
9054 show_schedule_multiple
,
9055 &setlist
, &showlist
);
9057 add_setshow_boolean_cmd ("step-mode", class_run
, &step_stop_if_no_debug
, _("\
9058 Set mode of the step operation."), _("\
9059 Show mode of the step operation."), _("\
9060 When set, doing a step over a function without debug line information\n\
9061 will stop at the first instruction of that function. Otherwise, the\n\
9062 function is skipped and the step command stops at a different source line."),
9064 show_step_stop_if_no_debug
,
9065 &setlist
, &showlist
);
9067 add_setshow_auto_boolean_cmd ("displaced-stepping", class_run
,
9068 &can_use_displaced_stepping
, _("\
9069 Set debugger's willingness to use displaced stepping."), _("\
9070 Show debugger's willingness to use displaced stepping."), _("\
9071 If on, gdb will use displaced stepping to step over breakpoints if it is\n\
9072 supported by the target architecture. If off, gdb will not use displaced\n\
9073 stepping to step over breakpoints, even if such is supported by the target\n\
9074 architecture. If auto (which is the default), gdb will use displaced stepping\n\
9075 if the target architecture supports it and non-stop mode is active, but will not\n\
9076 use it in all-stop mode (see help set non-stop)."),
9078 show_can_use_displaced_stepping
,
9079 &setlist
, &showlist
);
9081 add_setshow_enum_cmd ("exec-direction", class_run
, exec_direction_names
,
9082 &exec_direction
, _("Set direction of execution.\n\
9083 Options are 'forward' or 'reverse'."),
9084 _("Show direction of execution (forward/reverse)."),
9085 _("Tells gdb whether to execute forward or backward."),
9086 set_exec_direction_func
, show_exec_direction_func
,
9087 &setlist
, &showlist
);
9089 /* Set/show detach-on-fork: user-settable mode. */
9091 add_setshow_boolean_cmd ("detach-on-fork", class_run
, &detach_fork
, _("\
9092 Set whether gdb will detach the child of a fork."), _("\
9093 Show whether gdb will detach the child of a fork."), _("\
9094 Tells gdb whether to detach the child of a fork."),
9095 NULL
, NULL
, &setlist
, &showlist
);
9097 /* Set/show disable address space randomization mode. */
9099 add_setshow_boolean_cmd ("disable-randomization", class_support
,
9100 &disable_randomization
, _("\
9101 Set disabling of debuggee's virtual address space randomization."), _("\
9102 Show disabling of debuggee's virtual address space randomization."), _("\
9103 When this mode is on (which is the default), randomization of the virtual\n\
9104 address space is disabled. Standalone programs run with the randomization\n\
9105 enabled by default on some platforms."),
9106 &set_disable_randomization
,
9107 &show_disable_randomization
,
9108 &setlist
, &showlist
);
9110 /* ptid initializations */
9111 inferior_ptid
= null_ptid
;
9112 target_last_wait_ptid
= minus_one_ptid
;
9114 observer_attach_thread_ptid_changed (infrun_thread_ptid_changed
);
9115 observer_attach_thread_stop_requested (infrun_thread_stop_requested
);
9116 observer_attach_thread_exit (infrun_thread_thread_exit
);
9117 observer_attach_inferior_exit (infrun_inferior_exit
);
9119 /* Explicitly create without lookup, since that tries to create a
9120 value with a void typed value, and when we get here, gdbarch
9121 isn't initialized yet. At this point, we're quite sure there
9122 isn't another convenience variable of the same name. */
9123 create_internalvar_type_lazy ("_siginfo", &siginfo_funcs
, NULL
);
9125 add_setshow_boolean_cmd ("observer", no_class
,
9126 &observer_mode_1
, _("\
9127 Set whether gdb controls the inferior in observer mode."), _("\
9128 Show whether gdb controls the inferior in observer mode."), _("\
9129 In observer mode, GDB can get data from the inferior, but not\n\
9130 affect its execution. Registers and memory may not be changed,\n\
9131 breakpoints may not be set, and the program cannot be interrupted\n\