1 /* Target-struct-independent code to start (run) and stop an inferior
4 Copyright (C) 1986-2013 Free Software Foundation, Inc.
6 This file is part of GDB.
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 3 of the License, or
11 (at your option) any later version.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program. If not, see <http://www.gnu.org/licenses/>. */
22 #include "gdb_string.h"
27 #include "exceptions.h"
28 #include "breakpoint.h"
32 #include "cli/cli-script.h"
34 #include "gdbthread.h"
46 #include "dictionary.h"
48 #include "gdb_assert.h"
49 #include "mi/mi-common.h"
50 #include "event-top.h"
52 #include "inline-frame.h"
54 #include "tracepoint.h"
55 #include "continuations.h"
60 #include "completer.h"
61 #include "target-descriptions.h"
63 /* Prototypes for local functions */
65 static void signals_info (char *, int);
67 static void handle_command (char *, int);
69 static void sig_print_info (enum gdb_signal
);
71 static void sig_print_header (void);
73 static void resume_cleanups (void *);
75 static int hook_stop_stub (void *);
77 static int restore_selected_frame (void *);
79 static int follow_fork (void);
81 static void set_schedlock_func (char *args
, int from_tty
,
82 struct cmd_list_element
*c
);
84 static int currently_stepping (struct thread_info
*tp
);
86 static int currently_stepping_or_nexting_callback (struct thread_info
*tp
,
89 static void xdb_handle_command (char *args
, int from_tty
);
91 static int prepare_to_proceed (int);
93 static void print_exited_reason (int exitstatus
);
95 static void print_signal_exited_reason (enum gdb_signal siggnal
);
97 static void print_no_history_reason (void);
99 static void print_signal_received_reason (enum gdb_signal siggnal
);
101 static void print_end_stepping_range_reason (void);
103 void _initialize_infrun (void);
105 void nullify_last_target_wait_ptid (void);
107 static void insert_hp_step_resume_breakpoint_at_frame (struct frame_info
*);
109 static void insert_step_resume_breakpoint_at_caller (struct frame_info
*);
111 static void insert_longjmp_resume_breakpoint (struct gdbarch
*, CORE_ADDR
);
113 /* When set, stop the 'step' command if we enter a function which has
114 no line number information. The normal behavior is that we step
115 over such function. */
116 int step_stop_if_no_debug
= 0;
118 show_step_stop_if_no_debug (struct ui_file
*file
, int from_tty
,
119 struct cmd_list_element
*c
, const char *value
)
121 fprintf_filtered (file
, _("Mode of the step operation is %s.\n"), value
);
124 /* In asynchronous mode, but simulating synchronous execution. */
126 int sync_execution
= 0;
128 /* wait_for_inferior and normal_stop use this to notify the user
129 when the inferior stopped in a different thread than it had been
132 static ptid_t previous_inferior_ptid
;
134 /* Default behavior is to detach newly forked processes (legacy). */
137 int debug_displaced
= 0;
139 show_debug_displaced (struct ui_file
*file
, int from_tty
,
140 struct cmd_list_element
*c
, const char *value
)
142 fprintf_filtered (file
, _("Displace stepping debugging is %s.\n"), value
);
145 unsigned int debug_infrun
= 0;
147 show_debug_infrun (struct ui_file
*file
, int from_tty
,
148 struct cmd_list_element
*c
, const char *value
)
150 fprintf_filtered (file
, _("Inferior debugging is %s.\n"), value
);
154 /* Support for disabling address space randomization. */
156 int disable_randomization
= 1;
159 show_disable_randomization (struct ui_file
*file
, int from_tty
,
160 struct cmd_list_element
*c
, const char *value
)
162 if (target_supports_disable_randomization ())
163 fprintf_filtered (file
,
164 _("Disabling randomization of debuggee's "
165 "virtual address space is %s.\n"),
168 fputs_filtered (_("Disabling randomization of debuggee's "
169 "virtual address space is unsupported on\n"
170 "this platform.\n"), file
);
174 set_disable_randomization (char *args
, int from_tty
,
175 struct cmd_list_element
*c
)
177 if (!target_supports_disable_randomization ())
178 error (_("Disabling randomization of debuggee's "
179 "virtual address space is unsupported on\n"
184 /* If the program uses ELF-style shared libraries, then calls to
185 functions in shared libraries go through stubs, which live in a
186 table called the PLT (Procedure Linkage Table). The first time the
187 function is called, the stub sends control to the dynamic linker,
188 which looks up the function's real address, patches the stub so
189 that future calls will go directly to the function, and then passes
190 control to the function.
192 If we are stepping at the source level, we don't want to see any of
193 this --- we just want to skip over the stub and the dynamic linker.
194 The simple approach is to single-step until control leaves the
197 However, on some systems (e.g., Red Hat's 5.2 distribution) the
198 dynamic linker calls functions in the shared C library, so you
199 can't tell from the PC alone whether the dynamic linker is still
200 running. In this case, we use a step-resume breakpoint to get us
201 past the dynamic linker, as if we were using "next" to step over a
204 in_solib_dynsym_resolve_code() says whether we're in the dynamic
205 linker code or not. Normally, this means we single-step. However,
206 if SKIP_SOLIB_RESOLVER then returns non-zero, then its value is an
207 address where we can place a step-resume breakpoint to get past the
208 linker's symbol resolution function.
210 in_solib_dynsym_resolve_code() can generally be implemented in a
211 pretty portable way, by comparing the PC against the address ranges
212 of the dynamic linker's sections.
214 SKIP_SOLIB_RESOLVER is generally going to be system-specific, since
215 it depends on internal details of the dynamic linker. It's usually
216 not too hard to figure out where to put a breakpoint, but it
217 certainly isn't portable. SKIP_SOLIB_RESOLVER should do plenty of
218 sanity checking. If it can't figure things out, returning zero and
219 getting the (possibly confusing) stepping behavior is better than
220 signalling an error, which will obscure the change in the
223 /* This function returns TRUE if pc is the address of an instruction
224 that lies within the dynamic linker (such as the event hook, or the
227 This function must be used only when a dynamic linker event has
228 been caught, and the inferior is being stepped out of the hook, or
229 undefined results are guaranteed. */
231 #ifndef SOLIB_IN_DYNAMIC_LINKER
232 #define SOLIB_IN_DYNAMIC_LINKER(pid,pc) 0
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 static int non_stop_1
= 0;
241 int observer_mode
= 0;
242 static int observer_mode_1
= 0;
245 set_observer_mode (char *args
, int from_tty
,
246 struct cmd_list_element
*c
)
248 extern int pagination_enabled
;
250 if (target_has_execution
)
252 observer_mode_1
= observer_mode
;
253 error (_("Cannot change this setting while the inferior is running."));
256 observer_mode
= observer_mode_1
;
258 may_write_registers
= !observer_mode
;
259 may_write_memory
= !observer_mode
;
260 may_insert_breakpoints
= !observer_mode
;
261 may_insert_tracepoints
= !observer_mode
;
262 /* We can insert fast tracepoints in or out of observer mode,
263 but enable them if we're going into this mode. */
265 may_insert_fast_tracepoints
= 1;
266 may_stop
= !observer_mode
;
267 update_target_permissions ();
269 /* Going *into* observer mode we must force non-stop, then
270 going out we leave it that way. */
273 target_async_permitted
= 1;
274 pagination_enabled
= 0;
275 non_stop
= non_stop_1
= 1;
279 printf_filtered (_("Observer mode is now %s.\n"),
280 (observer_mode
? "on" : "off"));
284 show_observer_mode (struct ui_file
*file
, int from_tty
,
285 struct cmd_list_element
*c
, const char *value
)
287 fprintf_filtered (file
, _("Observer mode is %s.\n"), value
);
290 /* This updates the value of observer mode based on changes in
291 permissions. Note that we are deliberately ignoring the values of
292 may-write-registers and may-write-memory, since the user may have
293 reason to enable these during a session, for instance to turn on a
294 debugging-related global. */
297 update_observer_mode (void)
301 newval
= (!may_insert_breakpoints
302 && !may_insert_tracepoints
303 && may_insert_fast_tracepoints
307 /* Let the user know if things change. */
308 if (newval
!= observer_mode
)
309 printf_filtered (_("Observer mode is now %s.\n"),
310 (newval
? "on" : "off"));
312 observer_mode
= observer_mode_1
= newval
;
315 /* Tables of how to react to signals; the user sets them. */
317 static unsigned char *signal_stop
;
318 static unsigned char *signal_print
;
319 static unsigned char *signal_program
;
321 /* Table of signals that are registered with "catch signal". A
322 non-zero entry indicates that the signal is caught by some "catch
323 signal" command. This has size GDB_SIGNAL_LAST, to accommodate all
325 static unsigned char *signal_catch
;
327 /* Table of signals that the target may silently handle.
328 This is automatically determined from the flags above,
329 and simply cached here. */
330 static unsigned char *signal_pass
;
332 #define SET_SIGS(nsigs,sigs,flags) \
334 int signum = (nsigs); \
335 while (signum-- > 0) \
336 if ((sigs)[signum]) \
337 (flags)[signum] = 1; \
340 #define UNSET_SIGS(nsigs,sigs,flags) \
342 int signum = (nsigs); \
343 while (signum-- > 0) \
344 if ((sigs)[signum]) \
345 (flags)[signum] = 0; \
348 /* Update the target's copy of SIGNAL_PROGRAM. The sole purpose of
349 this function is to avoid exporting `signal_program'. */
352 update_signals_program_target (void)
354 target_program_signals ((int) GDB_SIGNAL_LAST
, signal_program
);
357 /* Value to pass to target_resume() to cause all threads to resume. */
359 #define RESUME_ALL minus_one_ptid
361 /* Command list pointer for the "stop" placeholder. */
363 static struct cmd_list_element
*stop_command
;
365 /* Function inferior was in as of last step command. */
367 static struct symbol
*step_start_function
;
369 /* Nonzero if we want to give control to the user when we're notified
370 of shared library events by the dynamic linker. */
371 int stop_on_solib_events
;
373 show_stop_on_solib_events (struct ui_file
*file
, int from_tty
,
374 struct cmd_list_element
*c
, const char *value
)
376 fprintf_filtered (file
, _("Stopping for shared library events is %s.\n"),
380 /* Nonzero means expecting a trace trap
381 and should stop the inferior and return silently when it happens. */
385 /* Save register contents here when executing a "finish" command or are
386 about to pop a stack dummy frame, if-and-only-if proceed_to_finish is set.
387 Thus this contains the return value from the called function (assuming
388 values are returned in a register). */
390 struct regcache
*stop_registers
;
392 /* Nonzero after stop if current stack frame should be printed. */
394 static int stop_print_frame
;
396 /* This is a cached copy of the pid/waitstatus of the last event
397 returned by target_wait()/deprecated_target_wait_hook(). This
398 information is returned by get_last_target_status(). */
399 static ptid_t target_last_wait_ptid
;
400 static struct target_waitstatus target_last_waitstatus
;
402 static void context_switch (ptid_t ptid
);
404 void init_thread_stepping_state (struct thread_info
*tss
);
406 static void init_infwait_state (void);
408 static const char follow_fork_mode_child
[] = "child";
409 static const char follow_fork_mode_parent
[] = "parent";
411 static const char *const follow_fork_mode_kind_names
[] = {
412 follow_fork_mode_child
,
413 follow_fork_mode_parent
,
417 static const char *follow_fork_mode_string
= follow_fork_mode_parent
;
419 show_follow_fork_mode_string (struct ui_file
*file
, int from_tty
,
420 struct cmd_list_element
*c
, const char *value
)
422 fprintf_filtered (file
,
423 _("Debugger response to a program "
424 "call of fork or vfork is \"%s\".\n"),
429 /* Tell the target to follow the fork we're stopped at. Returns true
430 if the inferior should be resumed; false, if the target for some
431 reason decided it's best not to resume. */
436 int follow_child
= (follow_fork_mode_string
== follow_fork_mode_child
);
437 int should_resume
= 1;
438 struct thread_info
*tp
;
440 /* Copy user stepping state to the new inferior thread. FIXME: the
441 followed fork child thread should have a copy of most of the
442 parent thread structure's run control related fields, not just these.
443 Initialized to avoid "may be used uninitialized" warnings from gcc. */
444 struct breakpoint
*step_resume_breakpoint
= NULL
;
445 struct breakpoint
*exception_resume_breakpoint
= NULL
;
446 CORE_ADDR step_range_start
= 0;
447 CORE_ADDR step_range_end
= 0;
448 struct frame_id step_frame_id
= { 0 };
453 struct target_waitstatus wait_status
;
455 /* Get the last target status returned by target_wait(). */
456 get_last_target_status (&wait_ptid
, &wait_status
);
458 /* If not stopped at a fork event, then there's nothing else to
460 if (wait_status
.kind
!= TARGET_WAITKIND_FORKED
461 && wait_status
.kind
!= TARGET_WAITKIND_VFORKED
)
464 /* Check if we switched over from WAIT_PTID, since the event was
466 if (!ptid_equal (wait_ptid
, minus_one_ptid
)
467 && !ptid_equal (inferior_ptid
, wait_ptid
))
469 /* We did. Switch back to WAIT_PTID thread, to tell the
470 target to follow it (in either direction). We'll
471 afterwards refuse to resume, and inform the user what
473 switch_to_thread (wait_ptid
);
478 tp
= inferior_thread ();
480 /* If there were any forks/vforks that were caught and are now to be
481 followed, then do so now. */
482 switch (tp
->pending_follow
.kind
)
484 case TARGET_WAITKIND_FORKED
:
485 case TARGET_WAITKIND_VFORKED
:
487 ptid_t parent
, child
;
489 /* If the user did a next/step, etc, over a fork call,
490 preserve the stepping state in the fork child. */
491 if (follow_child
&& should_resume
)
493 step_resume_breakpoint
= clone_momentary_breakpoint
494 (tp
->control
.step_resume_breakpoint
);
495 step_range_start
= tp
->control
.step_range_start
;
496 step_range_end
= tp
->control
.step_range_end
;
497 step_frame_id
= tp
->control
.step_frame_id
;
498 exception_resume_breakpoint
499 = clone_momentary_breakpoint (tp
->control
.exception_resume_breakpoint
);
501 /* For now, delete the parent's sr breakpoint, otherwise,
502 parent/child sr breakpoints are considered duplicates,
503 and the child version will not be installed. Remove
504 this when the breakpoints module becomes aware of
505 inferiors and address spaces. */
506 delete_step_resume_breakpoint (tp
);
507 tp
->control
.step_range_start
= 0;
508 tp
->control
.step_range_end
= 0;
509 tp
->control
.step_frame_id
= null_frame_id
;
510 delete_exception_resume_breakpoint (tp
);
513 parent
= inferior_ptid
;
514 child
= tp
->pending_follow
.value
.related_pid
;
516 /* Tell the target to do whatever is necessary to follow
517 either parent or child. */
518 if (target_follow_fork (follow_child
))
520 /* Target refused to follow, or there's some other reason
521 we shouldn't resume. */
526 /* This pending follow fork event is now handled, one way
527 or another. The previous selected thread may be gone
528 from the lists by now, but if it is still around, need
529 to clear the pending follow request. */
530 tp
= find_thread_ptid (parent
);
532 tp
->pending_follow
.kind
= TARGET_WAITKIND_SPURIOUS
;
534 /* This makes sure we don't try to apply the "Switched
535 over from WAIT_PID" logic above. */
536 nullify_last_target_wait_ptid ();
538 /* If we followed the child, switch to it... */
541 switch_to_thread (child
);
543 /* ... and preserve the stepping state, in case the
544 user was stepping over the fork call. */
547 tp
= inferior_thread ();
548 tp
->control
.step_resume_breakpoint
549 = step_resume_breakpoint
;
550 tp
->control
.step_range_start
= step_range_start
;
551 tp
->control
.step_range_end
= step_range_end
;
552 tp
->control
.step_frame_id
= step_frame_id
;
553 tp
->control
.exception_resume_breakpoint
554 = exception_resume_breakpoint
;
558 /* If we get here, it was because we're trying to
559 resume from a fork catchpoint, but, the user
560 has switched threads away from the thread that
561 forked. In that case, the resume command
562 issued is most likely not applicable to the
563 child, so just warn, and refuse to resume. */
564 warning (_("Not resuming: switched threads "
565 "before following fork child.\n"));
568 /* Reset breakpoints in the child as appropriate. */
569 follow_inferior_reset_breakpoints ();
572 switch_to_thread (parent
);
576 case TARGET_WAITKIND_SPURIOUS
:
577 /* Nothing to follow. */
580 internal_error (__FILE__
, __LINE__
,
581 "Unexpected pending_follow.kind %d\n",
582 tp
->pending_follow
.kind
);
586 return should_resume
;
590 follow_inferior_reset_breakpoints (void)
592 struct thread_info
*tp
= inferior_thread ();
594 /* Was there a step_resume breakpoint? (There was if the user
595 did a "next" at the fork() call.) If so, explicitly reset its
598 step_resumes are a form of bp that are made to be per-thread.
599 Since we created the step_resume bp when the parent process
600 was being debugged, and now are switching to the child process,
601 from the breakpoint package's viewpoint, that's a switch of
602 "threads". We must update the bp's notion of which thread
603 it is for, or it'll be ignored when it triggers. */
605 if (tp
->control
.step_resume_breakpoint
)
606 breakpoint_re_set_thread (tp
->control
.step_resume_breakpoint
);
608 if (tp
->control
.exception_resume_breakpoint
)
609 breakpoint_re_set_thread (tp
->control
.exception_resume_breakpoint
);
611 /* Reinsert all breakpoints in the child. The user may have set
612 breakpoints after catching the fork, in which case those
613 were never set in the child, but only in the parent. This makes
614 sure the inserted breakpoints match the breakpoint list. */
616 breakpoint_re_set ();
617 insert_breakpoints ();
620 /* The child has exited or execed: resume threads of the parent the
621 user wanted to be executing. */
624 proceed_after_vfork_done (struct thread_info
*thread
,
627 int pid
= * (int *) arg
;
629 if (ptid_get_pid (thread
->ptid
) == pid
630 && is_running (thread
->ptid
)
631 && !is_executing (thread
->ptid
)
632 && !thread
->stop_requested
633 && thread
->suspend
.stop_signal
== GDB_SIGNAL_0
)
636 fprintf_unfiltered (gdb_stdlog
,
637 "infrun: resuming vfork parent thread %s\n",
638 target_pid_to_str (thread
->ptid
));
640 switch_to_thread (thread
->ptid
);
641 clear_proceed_status ();
642 proceed ((CORE_ADDR
) -1, GDB_SIGNAL_DEFAULT
, 0);
648 /* Called whenever we notice an exec or exit event, to handle
649 detaching or resuming a vfork parent. */
652 handle_vfork_child_exec_or_exit (int exec
)
654 struct inferior
*inf
= current_inferior ();
656 if (inf
->vfork_parent
)
658 int resume_parent
= -1;
660 /* This exec or exit marks the end of the shared memory region
661 between the parent and the child. If the user wanted to
662 detach from the parent, now is the time. */
664 if (inf
->vfork_parent
->pending_detach
)
666 struct thread_info
*tp
;
667 struct cleanup
*old_chain
;
668 struct program_space
*pspace
;
669 struct address_space
*aspace
;
671 /* follow-fork child, detach-on-fork on. */
673 inf
->vfork_parent
->pending_detach
= 0;
677 /* If we're handling a child exit, then inferior_ptid
678 points at the inferior's pid, not to a thread. */
679 old_chain
= save_inferior_ptid ();
680 save_current_program_space ();
681 save_current_inferior ();
684 old_chain
= save_current_space_and_thread ();
686 /* We're letting loose of the parent. */
687 tp
= any_live_thread_of_process (inf
->vfork_parent
->pid
);
688 switch_to_thread (tp
->ptid
);
690 /* We're about to detach from the parent, which implicitly
691 removes breakpoints from its address space. There's a
692 catch here: we want to reuse the spaces for the child,
693 but, parent/child are still sharing the pspace at this
694 point, although the exec in reality makes the kernel give
695 the child a fresh set of new pages. The problem here is
696 that the breakpoints module being unaware of this, would
697 likely chose the child process to write to the parent
698 address space. Swapping the child temporarily away from
699 the spaces has the desired effect. Yes, this is "sort
702 pspace
= inf
->pspace
;
703 aspace
= inf
->aspace
;
707 if (debug_infrun
|| info_verbose
)
709 target_terminal_ours ();
712 fprintf_filtered (gdb_stdlog
,
713 "Detaching vfork parent process "
714 "%d after child exec.\n",
715 inf
->vfork_parent
->pid
);
717 fprintf_filtered (gdb_stdlog
,
718 "Detaching vfork parent process "
719 "%d after child exit.\n",
720 inf
->vfork_parent
->pid
);
723 target_detach (NULL
, 0);
726 inf
->pspace
= pspace
;
727 inf
->aspace
= aspace
;
729 do_cleanups (old_chain
);
733 /* We're staying attached to the parent, so, really give the
734 child a new address space. */
735 inf
->pspace
= add_program_space (maybe_new_address_space ());
736 inf
->aspace
= inf
->pspace
->aspace
;
738 set_current_program_space (inf
->pspace
);
740 resume_parent
= inf
->vfork_parent
->pid
;
742 /* Break the bonds. */
743 inf
->vfork_parent
->vfork_child
= NULL
;
747 struct cleanup
*old_chain
;
748 struct program_space
*pspace
;
750 /* If this is a vfork child exiting, then the pspace and
751 aspaces were shared with the parent. Since we're
752 reporting the process exit, we'll be mourning all that is
753 found in the address space, and switching to null_ptid,
754 preparing to start a new inferior. But, since we don't
755 want to clobber the parent's address/program spaces, we
756 go ahead and create a new one for this exiting
759 /* Switch to null_ptid, so that clone_program_space doesn't want
760 to read the selected frame of a dead process. */
761 old_chain
= save_inferior_ptid ();
762 inferior_ptid
= null_ptid
;
764 /* This inferior is dead, so avoid giving the breakpoints
765 module the option to write through to it (cloning a
766 program space resets breakpoints). */
769 pspace
= add_program_space (maybe_new_address_space ());
770 set_current_program_space (pspace
);
772 inf
->symfile_flags
= SYMFILE_NO_READ
;
773 clone_program_space (pspace
, inf
->vfork_parent
->pspace
);
774 inf
->pspace
= pspace
;
775 inf
->aspace
= pspace
->aspace
;
777 /* Put back inferior_ptid. We'll continue mourning this
779 do_cleanups (old_chain
);
781 resume_parent
= inf
->vfork_parent
->pid
;
782 /* Break the bonds. */
783 inf
->vfork_parent
->vfork_child
= NULL
;
786 inf
->vfork_parent
= NULL
;
788 gdb_assert (current_program_space
== inf
->pspace
);
790 if (non_stop
&& resume_parent
!= -1)
792 /* If the user wanted the parent to be running, let it go
794 struct cleanup
*old_chain
= make_cleanup_restore_current_thread ();
797 fprintf_unfiltered (gdb_stdlog
,
798 "infrun: resuming vfork parent process %d\n",
801 iterate_over_threads (proceed_after_vfork_done
, &resume_parent
);
803 do_cleanups (old_chain
);
808 /* Enum strings for "set|show displaced-stepping". */
810 static const char follow_exec_mode_new
[] = "new";
811 static const char follow_exec_mode_same
[] = "same";
812 static const char *const follow_exec_mode_names
[] =
814 follow_exec_mode_new
,
815 follow_exec_mode_same
,
819 static const char *follow_exec_mode_string
= follow_exec_mode_same
;
821 show_follow_exec_mode_string (struct ui_file
*file
, int from_tty
,
822 struct cmd_list_element
*c
, const char *value
)
824 fprintf_filtered (file
, _("Follow exec mode is \"%s\".\n"), value
);
827 /* EXECD_PATHNAME is assumed to be non-NULL. */
830 follow_exec (ptid_t pid
, char *execd_pathname
)
832 struct thread_info
*th
= inferior_thread ();
833 struct inferior
*inf
= current_inferior ();
835 /* This is an exec event that we actually wish to pay attention to.
836 Refresh our symbol table to the newly exec'd program, remove any
839 If there are breakpoints, they aren't really inserted now,
840 since the exec() transformed our inferior into a fresh set
843 We want to preserve symbolic breakpoints on the list, since
844 we have hopes that they can be reset after the new a.out's
845 symbol table is read.
847 However, any "raw" breakpoints must be removed from the list
848 (e.g., the solib bp's), since their address is probably invalid
851 And, we DON'T want to call delete_breakpoints() here, since
852 that may write the bp's "shadow contents" (the instruction
853 value that was overwritten witha TRAP instruction). Since
854 we now have a new a.out, those shadow contents aren't valid. */
856 mark_breakpoints_out ();
858 update_breakpoints_after_exec ();
860 /* If there was one, it's gone now. We cannot truly step-to-next
861 statement through an exec(). */
862 th
->control
.step_resume_breakpoint
= NULL
;
863 th
->control
.exception_resume_breakpoint
= NULL
;
864 th
->control
.step_range_start
= 0;
865 th
->control
.step_range_end
= 0;
867 /* The target reports the exec event to the main thread, even if
868 some other thread does the exec, and even if the main thread was
869 already stopped --- if debugging in non-stop mode, it's possible
870 the user had the main thread held stopped in the previous image
871 --- release it now. This is the same behavior as step-over-exec
872 with scheduler-locking on in all-stop mode. */
873 th
->stop_requested
= 0;
875 /* What is this a.out's name? */
876 printf_unfiltered (_("%s is executing new program: %s\n"),
877 target_pid_to_str (inferior_ptid
),
880 /* We've followed the inferior through an exec. Therefore, the
881 inferior has essentially been killed & reborn. */
883 gdb_flush (gdb_stdout
);
885 breakpoint_init_inferior (inf_execd
);
887 if (gdb_sysroot
&& *gdb_sysroot
)
889 char *name
= alloca (strlen (gdb_sysroot
)
890 + strlen (execd_pathname
)
893 strcpy (name
, gdb_sysroot
);
894 strcat (name
, execd_pathname
);
895 execd_pathname
= name
;
898 /* Reset the shared library package. This ensures that we get a
899 shlib event when the child reaches "_start", at which point the
900 dld will have had a chance to initialize the child. */
901 /* Also, loading a symbol file below may trigger symbol lookups, and
902 we don't want those to be satisfied by the libraries of the
903 previous incarnation of this process. */
904 no_shared_libraries (NULL
, 0);
906 if (follow_exec_mode_string
== follow_exec_mode_new
)
908 struct program_space
*pspace
;
910 /* The user wants to keep the old inferior and program spaces
911 around. Create a new fresh one, and switch to it. */
913 inf
= add_inferior (current_inferior ()->pid
);
914 pspace
= add_program_space (maybe_new_address_space ());
915 inf
->pspace
= pspace
;
916 inf
->aspace
= pspace
->aspace
;
918 exit_inferior_num_silent (current_inferior ()->num
);
920 set_current_inferior (inf
);
921 set_current_program_space (pspace
);
925 /* The old description may no longer be fit for the new image.
926 E.g, a 64-bit process exec'ed a 32-bit process. Clear the
927 old description; we'll read a new one below. No need to do
928 this on "follow-exec-mode new", as the old inferior stays
929 around (its description is later cleared/refetched on
931 target_clear_description ();
934 gdb_assert (current_program_space
== inf
->pspace
);
936 /* That a.out is now the one to use. */
937 exec_file_attach (execd_pathname
, 0);
939 /* SYMFILE_DEFER_BP_RESET is used as the proper displacement for PIE
940 (Position Independent Executable) main symbol file will get applied by
941 solib_create_inferior_hook below. breakpoint_re_set would fail to insert
942 the breakpoints with the zero displacement. */
944 symbol_file_add (execd_pathname
,
946 | SYMFILE_MAINLINE
| SYMFILE_DEFER_BP_RESET
),
949 if ((inf
->symfile_flags
& SYMFILE_NO_READ
) == 0)
950 set_initial_language ();
952 /* If the target can specify a description, read it. Must do this
953 after flipping to the new executable (because the target supplied
954 description must be compatible with the executable's
955 architecture, and the old executable may e.g., be 32-bit, while
956 the new one 64-bit), and before anything involving memory or
958 target_find_description ();
960 #ifdef SOLIB_CREATE_INFERIOR_HOOK
961 SOLIB_CREATE_INFERIOR_HOOK (PIDGET (inferior_ptid
));
963 solib_create_inferior_hook (0);
966 jit_inferior_created_hook ();
968 breakpoint_re_set ();
970 /* Reinsert all breakpoints. (Those which were symbolic have
971 been reset to the proper address in the new a.out, thanks
972 to symbol_file_command...). */
973 insert_breakpoints ();
975 /* The next resume of this inferior should bring it to the shlib
976 startup breakpoints. (If the user had also set bp's on
977 "main" from the old (parent) process, then they'll auto-
978 matically get reset there in the new process.). */
981 /* Non-zero if we just simulating a single-step. This is needed
982 because we cannot remove the breakpoints in the inferior process
983 until after the `wait' in `wait_for_inferior'. */
984 static int singlestep_breakpoints_inserted_p
= 0;
986 /* The thread we inserted single-step breakpoints for. */
987 static ptid_t singlestep_ptid
;
989 /* PC when we started this single-step. */
990 static CORE_ADDR singlestep_pc
;
992 /* If another thread hit the singlestep breakpoint, we save the original
993 thread here so that we can resume single-stepping it later. */
994 static ptid_t saved_singlestep_ptid
;
995 static int stepping_past_singlestep_breakpoint
;
997 /* If not equal to null_ptid, this means that after stepping over breakpoint
998 is finished, we need to switch to deferred_step_ptid, and step it.
1000 The use case is when one thread has hit a breakpoint, and then the user
1001 has switched to another thread and issued 'step'. We need to step over
1002 breakpoint in the thread which hit the breakpoint, but then continue
1003 stepping the thread user has selected. */
1004 static ptid_t deferred_step_ptid
;
1006 /* Displaced stepping. */
1008 /* In non-stop debugging mode, we must take special care to manage
1009 breakpoints properly; in particular, the traditional strategy for
1010 stepping a thread past a breakpoint it has hit is unsuitable.
1011 'Displaced stepping' is a tactic for stepping one thread past a
1012 breakpoint it has hit while ensuring that other threads running
1013 concurrently will hit the breakpoint as they should.
1015 The traditional way to step a thread T off a breakpoint in a
1016 multi-threaded program in all-stop mode is as follows:
1018 a0) Initially, all threads are stopped, and breakpoints are not
1020 a1) We single-step T, leaving breakpoints uninserted.
1021 a2) We insert breakpoints, and resume all threads.
1023 In non-stop debugging, however, this strategy is unsuitable: we
1024 don't want to have to stop all threads in the system in order to
1025 continue or step T past a breakpoint. Instead, we use displaced
1028 n0) Initially, T is stopped, other threads are running, and
1029 breakpoints are inserted.
1030 n1) We copy the instruction "under" the breakpoint to a separate
1031 location, outside the main code stream, making any adjustments
1032 to the instruction, register, and memory state as directed by
1034 n2) We single-step T over the instruction at its new location.
1035 n3) We adjust the resulting register and memory state as directed
1036 by T's architecture. This includes resetting T's PC to point
1037 back into the main instruction stream.
1040 This approach depends on the following gdbarch methods:
1042 - gdbarch_max_insn_length and gdbarch_displaced_step_location
1043 indicate where to copy the instruction, and how much space must
1044 be reserved there. We use these in step n1.
1046 - gdbarch_displaced_step_copy_insn copies a instruction to a new
1047 address, and makes any necessary adjustments to the instruction,
1048 register contents, and memory. We use this in step n1.
1050 - gdbarch_displaced_step_fixup adjusts registers and memory after
1051 we have successfuly single-stepped the instruction, to yield the
1052 same effect the instruction would have had if we had executed it
1053 at its original address. We use this in step n3.
1055 - gdbarch_displaced_step_free_closure provides cleanup.
1057 The gdbarch_displaced_step_copy_insn and
1058 gdbarch_displaced_step_fixup functions must be written so that
1059 copying an instruction with gdbarch_displaced_step_copy_insn,
1060 single-stepping across the copied instruction, and then applying
1061 gdbarch_displaced_insn_fixup should have the same effects on the
1062 thread's memory and registers as stepping the instruction in place
1063 would have. Exactly which responsibilities fall to the copy and
1064 which fall to the fixup is up to the author of those functions.
1066 See the comments in gdbarch.sh for details.
1068 Note that displaced stepping and software single-step cannot
1069 currently be used in combination, although with some care I think
1070 they could be made to. Software single-step works by placing
1071 breakpoints on all possible subsequent instructions; if the
1072 displaced instruction is a PC-relative jump, those breakpoints
1073 could fall in very strange places --- on pages that aren't
1074 executable, or at addresses that are not proper instruction
1075 boundaries. (We do generally let other threads run while we wait
1076 to hit the software single-step breakpoint, and they might
1077 encounter such a corrupted instruction.) One way to work around
1078 this would be to have gdbarch_displaced_step_copy_insn fully
1079 simulate the effect of PC-relative instructions (and return NULL)
1080 on architectures that use software single-stepping.
1082 In non-stop mode, we can have independent and simultaneous step
1083 requests, so more than one thread may need to simultaneously step
1084 over a breakpoint. The current implementation assumes there is
1085 only one scratch space per process. In this case, we have to
1086 serialize access to the scratch space. If thread A wants to step
1087 over a breakpoint, but we are currently waiting for some other
1088 thread to complete a displaced step, we leave thread A stopped and
1089 place it in the displaced_step_request_queue. Whenever a displaced
1090 step finishes, we pick the next thread in the queue and start a new
1091 displaced step operation on it. See displaced_step_prepare and
1092 displaced_step_fixup for details. */
1094 struct displaced_step_request
1097 struct displaced_step_request
*next
;
1100 /* Per-inferior displaced stepping state. */
1101 struct displaced_step_inferior_state
1103 /* Pointer to next in linked list. */
1104 struct displaced_step_inferior_state
*next
;
1106 /* The process this displaced step state refers to. */
1109 /* A queue of pending displaced stepping requests. One entry per
1110 thread that needs to do a displaced step. */
1111 struct displaced_step_request
*step_request_queue
;
1113 /* If this is not null_ptid, this is the thread carrying out a
1114 displaced single-step in process PID. This thread's state will
1115 require fixing up once it has completed its step. */
1118 /* The architecture the thread had when we stepped it. */
1119 struct gdbarch
*step_gdbarch
;
1121 /* The closure provided gdbarch_displaced_step_copy_insn, to be used
1122 for post-step cleanup. */
1123 struct displaced_step_closure
*step_closure
;
1125 /* The address of the original instruction, and the copy we
1127 CORE_ADDR step_original
, step_copy
;
1129 /* Saved contents of copy area. */
1130 gdb_byte
*step_saved_copy
;
1133 /* The list of states of processes involved in displaced stepping
1135 static struct displaced_step_inferior_state
*displaced_step_inferior_states
;
1137 /* Get the displaced stepping state of process PID. */
1139 static struct displaced_step_inferior_state
*
1140 get_displaced_stepping_state (int pid
)
1142 struct displaced_step_inferior_state
*state
;
1144 for (state
= displaced_step_inferior_states
;
1146 state
= state
->next
)
1147 if (state
->pid
== pid
)
1153 /* Add a new displaced stepping state for process PID to the displaced
1154 stepping state list, or return a pointer to an already existing
1155 entry, if it already exists. Never returns NULL. */
1157 static struct displaced_step_inferior_state
*
1158 add_displaced_stepping_state (int pid
)
1160 struct displaced_step_inferior_state
*state
;
1162 for (state
= displaced_step_inferior_states
;
1164 state
= state
->next
)
1165 if (state
->pid
== pid
)
1168 state
= xcalloc (1, sizeof (*state
));
1170 state
->next
= displaced_step_inferior_states
;
1171 displaced_step_inferior_states
= state
;
1176 /* If inferior is in displaced stepping, and ADDR equals to starting address
1177 of copy area, return corresponding displaced_step_closure. Otherwise,
1180 struct displaced_step_closure
*
1181 get_displaced_step_closure_by_addr (CORE_ADDR addr
)
1183 struct displaced_step_inferior_state
*displaced
1184 = get_displaced_stepping_state (ptid_get_pid (inferior_ptid
));
1186 /* If checking the mode of displaced instruction in copy area. */
1187 if (displaced
&& !ptid_equal (displaced
->step_ptid
, null_ptid
)
1188 && (displaced
->step_copy
== addr
))
1189 return displaced
->step_closure
;
1194 /* Remove the displaced stepping state of process PID. */
1197 remove_displaced_stepping_state (int pid
)
1199 struct displaced_step_inferior_state
*it
, **prev_next_p
;
1201 gdb_assert (pid
!= 0);
1203 it
= displaced_step_inferior_states
;
1204 prev_next_p
= &displaced_step_inferior_states
;
1209 *prev_next_p
= it
->next
;
1214 prev_next_p
= &it
->next
;
1220 infrun_inferior_exit (struct inferior
*inf
)
1222 remove_displaced_stepping_state (inf
->pid
);
1225 /* If ON, and the architecture supports it, GDB will use displaced
1226 stepping to step over breakpoints. If OFF, or if the architecture
1227 doesn't support it, GDB will instead use the traditional
1228 hold-and-step approach. If AUTO (which is the default), GDB will
1229 decide which technique to use to step over breakpoints depending on
1230 which of all-stop or non-stop mode is active --- displaced stepping
1231 in non-stop mode; hold-and-step in all-stop mode. */
1233 static enum auto_boolean can_use_displaced_stepping
= AUTO_BOOLEAN_AUTO
;
1236 show_can_use_displaced_stepping (struct ui_file
*file
, int from_tty
,
1237 struct cmd_list_element
*c
,
1240 if (can_use_displaced_stepping
== AUTO_BOOLEAN_AUTO
)
1241 fprintf_filtered (file
,
1242 _("Debugger's willingness to use displaced stepping "
1243 "to step over breakpoints is %s (currently %s).\n"),
1244 value
, non_stop
? "on" : "off");
1246 fprintf_filtered (file
,
1247 _("Debugger's willingness to use displaced stepping "
1248 "to step over breakpoints is %s.\n"), value
);
1251 /* Return non-zero if displaced stepping can/should be used to step
1252 over breakpoints. */
1255 use_displaced_stepping (struct gdbarch
*gdbarch
)
1257 return (((can_use_displaced_stepping
== AUTO_BOOLEAN_AUTO
&& non_stop
)
1258 || can_use_displaced_stepping
== AUTO_BOOLEAN_TRUE
)
1259 && gdbarch_displaced_step_copy_insn_p (gdbarch
)
1260 && !RECORD_IS_USED
);
1263 /* Clean out any stray displaced stepping state. */
1265 displaced_step_clear (struct displaced_step_inferior_state
*displaced
)
1267 /* Indicate that there is no cleanup pending. */
1268 displaced
->step_ptid
= null_ptid
;
1270 if (displaced
->step_closure
)
1272 gdbarch_displaced_step_free_closure (displaced
->step_gdbarch
,
1273 displaced
->step_closure
);
1274 displaced
->step_closure
= NULL
;
1279 displaced_step_clear_cleanup (void *arg
)
1281 struct displaced_step_inferior_state
*state
= arg
;
1283 displaced_step_clear (state
);
1286 /* Dump LEN bytes at BUF in hex to FILE, followed by a newline. */
1288 displaced_step_dump_bytes (struct ui_file
*file
,
1289 const gdb_byte
*buf
,
1294 for (i
= 0; i
< len
; i
++)
1295 fprintf_unfiltered (file
, "%02x ", buf
[i
]);
1296 fputs_unfiltered ("\n", file
);
1299 /* Prepare to single-step, using displaced stepping.
1301 Note that we cannot use displaced stepping when we have a signal to
1302 deliver. If we have a signal to deliver and an instruction to step
1303 over, then after the step, there will be no indication from the
1304 target whether the thread entered a signal handler or ignored the
1305 signal and stepped over the instruction successfully --- both cases
1306 result in a simple SIGTRAP. In the first case we mustn't do a
1307 fixup, and in the second case we must --- but we can't tell which.
1308 Comments in the code for 'random signals' in handle_inferior_event
1309 explain how we handle this case instead.
1311 Returns 1 if preparing was successful -- this thread is going to be
1312 stepped now; or 0 if displaced stepping this thread got queued. */
1314 displaced_step_prepare (ptid_t ptid
)
1316 struct cleanup
*old_cleanups
, *ignore_cleanups
;
1317 struct regcache
*regcache
= get_thread_regcache (ptid
);
1318 struct gdbarch
*gdbarch
= get_regcache_arch (regcache
);
1319 CORE_ADDR original
, copy
;
1321 struct displaced_step_closure
*closure
;
1322 struct displaced_step_inferior_state
*displaced
;
1325 /* We should never reach this function if the architecture does not
1326 support displaced stepping. */
1327 gdb_assert (gdbarch_displaced_step_copy_insn_p (gdbarch
));
1329 /* We have to displaced step one thread at a time, as we only have
1330 access to a single scratch space per inferior. */
1332 displaced
= add_displaced_stepping_state (ptid_get_pid (ptid
));
1334 if (!ptid_equal (displaced
->step_ptid
, null_ptid
))
1336 /* Already waiting for a displaced step to finish. Defer this
1337 request and place in queue. */
1338 struct displaced_step_request
*req
, *new_req
;
1340 if (debug_displaced
)
1341 fprintf_unfiltered (gdb_stdlog
,
1342 "displaced: defering step of %s\n",
1343 target_pid_to_str (ptid
));
1345 new_req
= xmalloc (sizeof (*new_req
));
1346 new_req
->ptid
= ptid
;
1347 new_req
->next
= NULL
;
1349 if (displaced
->step_request_queue
)
1351 for (req
= displaced
->step_request_queue
;
1355 req
->next
= new_req
;
1358 displaced
->step_request_queue
= new_req
;
1364 if (debug_displaced
)
1365 fprintf_unfiltered (gdb_stdlog
,
1366 "displaced: stepping %s now\n",
1367 target_pid_to_str (ptid
));
1370 displaced_step_clear (displaced
);
1372 old_cleanups
= save_inferior_ptid ();
1373 inferior_ptid
= ptid
;
1375 original
= regcache_read_pc (regcache
);
1377 copy
= gdbarch_displaced_step_location (gdbarch
);
1378 len
= gdbarch_max_insn_length (gdbarch
);
1380 /* Save the original contents of the copy area. */
1381 displaced
->step_saved_copy
= xmalloc (len
);
1382 ignore_cleanups
= make_cleanup (free_current_contents
,
1383 &displaced
->step_saved_copy
);
1384 status
= target_read_memory (copy
, displaced
->step_saved_copy
, len
);
1386 throw_error (MEMORY_ERROR
,
1387 _("Error accessing memory address %s (%s) for "
1388 "displaced-stepping scratch space."),
1389 paddress (gdbarch
, copy
), safe_strerror (status
));
1390 if (debug_displaced
)
1392 fprintf_unfiltered (gdb_stdlog
, "displaced: saved %s: ",
1393 paddress (gdbarch
, copy
));
1394 displaced_step_dump_bytes (gdb_stdlog
,
1395 displaced
->step_saved_copy
,
1399 closure
= gdbarch_displaced_step_copy_insn (gdbarch
,
1400 original
, copy
, regcache
);
1402 /* We don't support the fully-simulated case at present. */
1403 gdb_assert (closure
);
1405 /* Save the information we need to fix things up if the step
1407 displaced
->step_ptid
= ptid
;
1408 displaced
->step_gdbarch
= gdbarch
;
1409 displaced
->step_closure
= closure
;
1410 displaced
->step_original
= original
;
1411 displaced
->step_copy
= copy
;
1413 make_cleanup (displaced_step_clear_cleanup
, displaced
);
1415 /* Resume execution at the copy. */
1416 regcache_write_pc (regcache
, copy
);
1418 discard_cleanups (ignore_cleanups
);
1420 do_cleanups (old_cleanups
);
1422 if (debug_displaced
)
1423 fprintf_unfiltered (gdb_stdlog
, "displaced: displaced pc to %s\n",
1424 paddress (gdbarch
, copy
));
1430 write_memory_ptid (ptid_t ptid
, CORE_ADDR memaddr
,
1431 const gdb_byte
*myaddr
, int len
)
1433 struct cleanup
*ptid_cleanup
= save_inferior_ptid ();
1435 inferior_ptid
= ptid
;
1436 write_memory (memaddr
, myaddr
, len
);
1437 do_cleanups (ptid_cleanup
);
1440 /* Restore the contents of the copy area for thread PTID. */
1443 displaced_step_restore (struct displaced_step_inferior_state
*displaced
,
1446 ULONGEST len
= gdbarch_max_insn_length (displaced
->step_gdbarch
);
1448 write_memory_ptid (ptid
, displaced
->step_copy
,
1449 displaced
->step_saved_copy
, len
);
1450 if (debug_displaced
)
1451 fprintf_unfiltered (gdb_stdlog
, "displaced: restored %s %s\n",
1452 target_pid_to_str (ptid
),
1453 paddress (displaced
->step_gdbarch
,
1454 displaced
->step_copy
));
1458 displaced_step_fixup (ptid_t event_ptid
, enum gdb_signal signal
)
1460 struct cleanup
*old_cleanups
;
1461 struct displaced_step_inferior_state
*displaced
1462 = get_displaced_stepping_state (ptid_get_pid (event_ptid
));
1464 /* Was any thread of this process doing a displaced step? */
1465 if (displaced
== NULL
)
1468 /* Was this event for the pid we displaced? */
1469 if (ptid_equal (displaced
->step_ptid
, null_ptid
)
1470 || ! ptid_equal (displaced
->step_ptid
, event_ptid
))
1473 old_cleanups
= make_cleanup (displaced_step_clear_cleanup
, displaced
);
1475 displaced_step_restore (displaced
, displaced
->step_ptid
);
1477 /* Did the instruction complete successfully? */
1478 if (signal
== GDB_SIGNAL_TRAP
)
1480 /* Fix up the resulting state. */
1481 gdbarch_displaced_step_fixup (displaced
->step_gdbarch
,
1482 displaced
->step_closure
,
1483 displaced
->step_original
,
1484 displaced
->step_copy
,
1485 get_thread_regcache (displaced
->step_ptid
));
1489 /* Since the instruction didn't complete, all we can do is
1491 struct regcache
*regcache
= get_thread_regcache (event_ptid
);
1492 CORE_ADDR pc
= regcache_read_pc (regcache
);
1494 pc
= displaced
->step_original
+ (pc
- displaced
->step_copy
);
1495 regcache_write_pc (regcache
, pc
);
1498 do_cleanups (old_cleanups
);
1500 displaced
->step_ptid
= null_ptid
;
1502 /* Are there any pending displaced stepping requests? If so, run
1503 one now. Leave the state object around, since we're likely to
1504 need it again soon. */
1505 while (displaced
->step_request_queue
)
1507 struct displaced_step_request
*head
;
1509 struct regcache
*regcache
;
1510 struct gdbarch
*gdbarch
;
1511 CORE_ADDR actual_pc
;
1512 struct address_space
*aspace
;
1514 head
= displaced
->step_request_queue
;
1516 displaced
->step_request_queue
= head
->next
;
1519 context_switch (ptid
);
1521 regcache
= get_thread_regcache (ptid
);
1522 actual_pc
= regcache_read_pc (regcache
);
1523 aspace
= get_regcache_aspace (regcache
);
1525 if (breakpoint_here_p (aspace
, actual_pc
))
1527 if (debug_displaced
)
1528 fprintf_unfiltered (gdb_stdlog
,
1529 "displaced: stepping queued %s now\n",
1530 target_pid_to_str (ptid
));
1532 displaced_step_prepare (ptid
);
1534 gdbarch
= get_regcache_arch (regcache
);
1536 if (debug_displaced
)
1538 CORE_ADDR actual_pc
= regcache_read_pc (regcache
);
1541 fprintf_unfiltered (gdb_stdlog
, "displaced: run %s: ",
1542 paddress (gdbarch
, actual_pc
));
1543 read_memory (actual_pc
, buf
, sizeof (buf
));
1544 displaced_step_dump_bytes (gdb_stdlog
, buf
, sizeof (buf
));
1547 if (gdbarch_displaced_step_hw_singlestep (gdbarch
,
1548 displaced
->step_closure
))
1549 target_resume (ptid
, 1, GDB_SIGNAL_0
);
1551 target_resume (ptid
, 0, GDB_SIGNAL_0
);
1553 /* Done, we're stepping a thread. */
1559 struct thread_info
*tp
= inferior_thread ();
1561 /* The breakpoint we were sitting under has since been
1563 tp
->control
.trap_expected
= 0;
1565 /* Go back to what we were trying to do. */
1566 step
= currently_stepping (tp
);
1568 if (debug_displaced
)
1569 fprintf_unfiltered (gdb_stdlog
,
1570 "displaced: breakpoint is gone: %s, step(%d)\n",
1571 target_pid_to_str (tp
->ptid
), step
);
1573 target_resume (ptid
, step
, GDB_SIGNAL_0
);
1574 tp
->suspend
.stop_signal
= GDB_SIGNAL_0
;
1576 /* This request was discarded. See if there's any other
1577 thread waiting for its turn. */
1582 /* Update global variables holding ptids to hold NEW_PTID if they were
1583 holding OLD_PTID. */
1585 infrun_thread_ptid_changed (ptid_t old_ptid
, ptid_t new_ptid
)
1587 struct displaced_step_request
*it
;
1588 struct displaced_step_inferior_state
*displaced
;
1590 if (ptid_equal (inferior_ptid
, old_ptid
))
1591 inferior_ptid
= new_ptid
;
1593 if (ptid_equal (singlestep_ptid
, old_ptid
))
1594 singlestep_ptid
= new_ptid
;
1596 if (ptid_equal (deferred_step_ptid
, old_ptid
))
1597 deferred_step_ptid
= new_ptid
;
1599 for (displaced
= displaced_step_inferior_states
;
1601 displaced
= displaced
->next
)
1603 if (ptid_equal (displaced
->step_ptid
, old_ptid
))
1604 displaced
->step_ptid
= new_ptid
;
1606 for (it
= displaced
->step_request_queue
; it
; it
= it
->next
)
1607 if (ptid_equal (it
->ptid
, old_ptid
))
1608 it
->ptid
= new_ptid
;
1615 /* Things to clean up if we QUIT out of resume (). */
1617 resume_cleanups (void *ignore
)
1622 static const char schedlock_off
[] = "off";
1623 static const char schedlock_on
[] = "on";
1624 static const char schedlock_step
[] = "step";
1625 static const char *const scheduler_enums
[] = {
1631 static const char *scheduler_mode
= schedlock_off
;
1633 show_scheduler_mode (struct ui_file
*file
, int from_tty
,
1634 struct cmd_list_element
*c
, const char *value
)
1636 fprintf_filtered (file
,
1637 _("Mode for locking scheduler "
1638 "during execution is \"%s\".\n"),
1643 set_schedlock_func (char *args
, int from_tty
, struct cmd_list_element
*c
)
1645 if (!target_can_lock_scheduler
)
1647 scheduler_mode
= schedlock_off
;
1648 error (_("Target '%s' cannot support this command."), target_shortname
);
1652 /* True if execution commands resume all threads of all processes by
1653 default; otherwise, resume only threads of the current inferior
1655 int sched_multi
= 0;
1657 /* Try to setup for software single stepping over the specified location.
1658 Return 1 if target_resume() should use hardware single step.
1660 GDBARCH the current gdbarch.
1661 PC the location to step over. */
1664 maybe_software_singlestep (struct gdbarch
*gdbarch
, CORE_ADDR pc
)
1668 if (execution_direction
== EXEC_FORWARD
1669 && gdbarch_software_single_step_p (gdbarch
)
1670 && gdbarch_software_single_step (gdbarch
, get_current_frame ()))
1673 /* Do not pull these breakpoints until after a `wait' in
1674 `wait_for_inferior'. */
1675 singlestep_breakpoints_inserted_p
= 1;
1676 singlestep_ptid
= inferior_ptid
;
1682 /* Return a ptid representing the set of threads that we will proceed,
1683 in the perspective of the user/frontend. We may actually resume
1684 fewer threads at first, e.g., if a thread is stopped at a
1685 breakpoint that needs stepping-off, but that should not be visible
1686 to the user/frontend, and neither should the frontend/user be
1687 allowed to proceed any of the threads that happen to be stopped for
1688 internal run control handling, if a previous command wanted them
1692 user_visible_resume_ptid (int step
)
1694 /* By default, resume all threads of all processes. */
1695 ptid_t resume_ptid
= RESUME_ALL
;
1697 /* Maybe resume only all threads of the current process. */
1698 if (!sched_multi
&& target_supports_multi_process ())
1700 resume_ptid
= pid_to_ptid (ptid_get_pid (inferior_ptid
));
1703 /* Maybe resume a single thread after all. */
1706 /* With non-stop mode on, threads are always handled
1708 resume_ptid
= inferior_ptid
;
1710 else if ((scheduler_mode
== schedlock_on
)
1711 || (scheduler_mode
== schedlock_step
1712 && (step
|| singlestep_breakpoints_inserted_p
)))
1714 /* User-settable 'scheduler' mode requires solo thread resume. */
1715 resume_ptid
= inferior_ptid
;
1721 /* Resume the inferior, but allow a QUIT. This is useful if the user
1722 wants to interrupt some lengthy single-stepping operation
1723 (for child processes, the SIGINT goes to the inferior, and so
1724 we get a SIGINT random_signal, but for remote debugging and perhaps
1725 other targets, that's not true).
1727 STEP nonzero if we should step (zero to continue instead).
1728 SIG is the signal to give the inferior (zero for none). */
1730 resume (int step
, enum gdb_signal sig
)
1732 int should_resume
= 1;
1733 struct cleanup
*old_cleanups
= make_cleanup (resume_cleanups
, 0);
1734 struct regcache
*regcache
= get_current_regcache ();
1735 struct gdbarch
*gdbarch
= get_regcache_arch (regcache
);
1736 struct thread_info
*tp
= inferior_thread ();
1737 CORE_ADDR pc
= regcache_read_pc (regcache
);
1738 struct address_space
*aspace
= get_regcache_aspace (regcache
);
1742 if (current_inferior ()->waiting_for_vfork_done
)
1744 /* Don't try to single-step a vfork parent that is waiting for
1745 the child to get out of the shared memory region (by exec'ing
1746 or exiting). This is particularly important on software
1747 single-step archs, as the child process would trip on the
1748 software single step breakpoint inserted for the parent
1749 process. Since the parent will not actually execute any
1750 instruction until the child is out of the shared region (such
1751 are vfork's semantics), it is safe to simply continue it.
1752 Eventually, we'll see a TARGET_WAITKIND_VFORK_DONE event for
1753 the parent, and tell it to `keep_going', which automatically
1754 re-sets it stepping. */
1756 fprintf_unfiltered (gdb_stdlog
,
1757 "infrun: resume : clear step\n");
1762 fprintf_unfiltered (gdb_stdlog
,
1763 "infrun: resume (step=%d, signal=%d), "
1764 "trap_expected=%d, current thread [%s] at %s\n",
1765 step
, sig
, tp
->control
.trap_expected
,
1766 target_pid_to_str (inferior_ptid
),
1767 paddress (gdbarch
, pc
));
1769 /* Normally, by the time we reach `resume', the breakpoints are either
1770 removed or inserted, as appropriate. The exception is if we're sitting
1771 at a permanent breakpoint; we need to step over it, but permanent
1772 breakpoints can't be removed. So we have to test for it here. */
1773 if (breakpoint_here_p (aspace
, pc
) == permanent_breakpoint_here
)
1775 if (gdbarch_skip_permanent_breakpoint_p (gdbarch
))
1776 gdbarch_skip_permanent_breakpoint (gdbarch
, regcache
);
1779 The program is stopped at a permanent breakpoint, but GDB does not know\n\
1780 how to step past a permanent breakpoint on this architecture. Try using\n\
1781 a command like `return' or `jump' to continue execution."));
1784 /* If enabled, step over breakpoints by executing a copy of the
1785 instruction at a different address.
1787 We can't use displaced stepping when we have a signal to deliver;
1788 the comments for displaced_step_prepare explain why. The
1789 comments in the handle_inferior event for dealing with 'random
1790 signals' explain what we do instead.
1792 We can't use displaced stepping when we are waiting for vfork_done
1793 event, displaced stepping breaks the vfork child similarly as single
1794 step software breakpoint. */
1795 if (use_displaced_stepping (gdbarch
)
1796 && (tp
->control
.trap_expected
1797 || (step
&& gdbarch_software_single_step_p (gdbarch
)))
1798 && sig
== GDB_SIGNAL_0
1799 && !current_inferior ()->waiting_for_vfork_done
)
1801 struct displaced_step_inferior_state
*displaced
;
1803 if (!displaced_step_prepare (inferior_ptid
))
1805 /* Got placed in displaced stepping queue. Will be resumed
1806 later when all the currently queued displaced stepping
1807 requests finish. The thread is not executing at this point,
1808 and the call to set_executing will be made later. But we
1809 need to call set_running here, since from frontend point of view,
1810 the thread is running. */
1811 set_running (inferior_ptid
, 1);
1812 discard_cleanups (old_cleanups
);
1816 /* Update pc to reflect the new address from which we will execute
1817 instructions due to displaced stepping. */
1818 pc
= regcache_read_pc (get_thread_regcache (inferior_ptid
));
1820 displaced
= get_displaced_stepping_state (ptid_get_pid (inferior_ptid
));
1821 step
= gdbarch_displaced_step_hw_singlestep (gdbarch
,
1822 displaced
->step_closure
);
1825 /* Do we need to do it the hard way, w/temp breakpoints? */
1827 step
= maybe_software_singlestep (gdbarch
, pc
);
1829 /* Currently, our software single-step implementation leads to different
1830 results than hardware single-stepping in one situation: when stepping
1831 into delivering a signal which has an associated signal handler,
1832 hardware single-step will stop at the first instruction of the handler,
1833 while software single-step will simply skip execution of the handler.
1835 For now, this difference in behavior is accepted since there is no
1836 easy way to actually implement single-stepping into a signal handler
1837 without kernel support.
1839 However, there is one scenario where this difference leads to follow-on
1840 problems: if we're stepping off a breakpoint by removing all breakpoints
1841 and then single-stepping. In this case, the software single-step
1842 behavior means that even if there is a *breakpoint* in the signal
1843 handler, GDB still would not stop.
1845 Fortunately, we can at least fix this particular issue. We detect
1846 here the case where we are about to deliver a signal while software
1847 single-stepping with breakpoints removed. In this situation, we
1848 revert the decisions to remove all breakpoints and insert single-
1849 step breakpoints, and instead we install a step-resume breakpoint
1850 at the current address, deliver the signal without stepping, and
1851 once we arrive back at the step-resume breakpoint, actually step
1852 over the breakpoint we originally wanted to step over. */
1853 if (singlestep_breakpoints_inserted_p
1854 && tp
->control
.trap_expected
&& sig
!= GDB_SIGNAL_0
)
1856 /* If we have nested signals or a pending signal is delivered
1857 immediately after a handler returns, might might already have
1858 a step-resume breakpoint set on the earlier handler. We cannot
1859 set another step-resume breakpoint; just continue on until the
1860 original breakpoint is hit. */
1861 if (tp
->control
.step_resume_breakpoint
== NULL
)
1863 insert_hp_step_resume_breakpoint_at_frame (get_current_frame ());
1864 tp
->step_after_step_resume_breakpoint
= 1;
1867 remove_single_step_breakpoints ();
1868 singlestep_breakpoints_inserted_p
= 0;
1870 insert_breakpoints ();
1871 tp
->control
.trap_expected
= 0;
1878 /* If STEP is set, it's a request to use hardware stepping
1879 facilities. But in that case, we should never
1880 use singlestep breakpoint. */
1881 gdb_assert (!(singlestep_breakpoints_inserted_p
&& step
));
1883 /* Decide the set of threads to ask the target to resume. Start
1884 by assuming everything will be resumed, than narrow the set
1885 by applying increasingly restricting conditions. */
1886 resume_ptid
= user_visible_resume_ptid (step
);
1888 /* Maybe resume a single thread after all. */
1889 if (singlestep_breakpoints_inserted_p
1890 && stepping_past_singlestep_breakpoint
)
1892 /* The situation here is as follows. In thread T1 we wanted to
1893 single-step. Lacking hardware single-stepping we've
1894 set breakpoint at the PC of the next instruction -- call it
1895 P. After resuming, we've hit that breakpoint in thread T2.
1896 Now we've removed original breakpoint, inserted breakpoint
1897 at P+1, and try to step to advance T2 past breakpoint.
1898 We need to step only T2, as if T1 is allowed to freely run,
1899 it can run past P, and if other threads are allowed to run,
1900 they can hit breakpoint at P+1, and nested hits of single-step
1901 breakpoints is not something we'd want -- that's complicated
1902 to support, and has no value. */
1903 resume_ptid
= inferior_ptid
;
1905 else if ((step
|| singlestep_breakpoints_inserted_p
)
1906 && tp
->control
.trap_expected
)
1908 /* We're allowing a thread to run past a breakpoint it has
1909 hit, by single-stepping the thread with the breakpoint
1910 removed. In which case, we need to single-step only this
1911 thread, and keep others stopped, as they can miss this
1912 breakpoint if allowed to run.
1914 The current code actually removes all breakpoints when
1915 doing this, not just the one being stepped over, so if we
1916 let other threads run, we can actually miss any
1917 breakpoint, not just the one at PC. */
1918 resume_ptid
= inferior_ptid
;
1921 if (gdbarch_cannot_step_breakpoint (gdbarch
))
1923 /* Most targets can step a breakpoint instruction, thus
1924 executing it normally. But if this one cannot, just
1925 continue and we will hit it anyway. */
1926 if (step
&& breakpoint_inserted_here_p (aspace
, pc
))
1931 && use_displaced_stepping (gdbarch
)
1932 && tp
->control
.trap_expected
)
1934 struct regcache
*resume_regcache
= get_thread_regcache (resume_ptid
);
1935 struct gdbarch
*resume_gdbarch
= get_regcache_arch (resume_regcache
);
1936 CORE_ADDR actual_pc
= regcache_read_pc (resume_regcache
);
1939 fprintf_unfiltered (gdb_stdlog
, "displaced: run %s: ",
1940 paddress (resume_gdbarch
, actual_pc
));
1941 read_memory (actual_pc
, buf
, sizeof (buf
));
1942 displaced_step_dump_bytes (gdb_stdlog
, buf
, sizeof (buf
));
1945 /* Install inferior's terminal modes. */
1946 target_terminal_inferior ();
1948 /* Avoid confusing the next resume, if the next stop/resume
1949 happens to apply to another thread. */
1950 tp
->suspend
.stop_signal
= GDB_SIGNAL_0
;
1952 /* Advise target which signals may be handled silently. If we have
1953 removed breakpoints because we are stepping over one (which can
1954 happen only if we are not using displaced stepping), we need to
1955 receive all signals to avoid accidentally skipping a breakpoint
1956 during execution of a signal handler. */
1957 if ((step
|| singlestep_breakpoints_inserted_p
)
1958 && tp
->control
.trap_expected
1959 && !use_displaced_stepping (gdbarch
))
1960 target_pass_signals (0, NULL
);
1962 target_pass_signals ((int) GDB_SIGNAL_LAST
, signal_pass
);
1964 target_resume (resume_ptid
, step
, sig
);
1967 discard_cleanups (old_cleanups
);
1972 /* Clear out all variables saying what to do when inferior is continued.
1973 First do this, then set the ones you want, then call `proceed'. */
1976 clear_proceed_status_thread (struct thread_info
*tp
)
1979 fprintf_unfiltered (gdb_stdlog
,
1980 "infrun: clear_proceed_status_thread (%s)\n",
1981 target_pid_to_str (tp
->ptid
));
1983 tp
->control
.trap_expected
= 0;
1984 tp
->control
.step_range_start
= 0;
1985 tp
->control
.step_range_end
= 0;
1986 tp
->control
.step_frame_id
= null_frame_id
;
1987 tp
->control
.step_stack_frame_id
= null_frame_id
;
1988 tp
->control
.step_over_calls
= STEP_OVER_UNDEBUGGABLE
;
1989 tp
->stop_requested
= 0;
1991 tp
->control
.stop_step
= 0;
1993 tp
->control
.proceed_to_finish
= 0;
1995 /* Discard any remaining commands or status from previous stop. */
1996 bpstat_clear (&tp
->control
.stop_bpstat
);
2000 clear_proceed_status_callback (struct thread_info
*tp
, void *data
)
2002 if (is_exited (tp
->ptid
))
2005 clear_proceed_status_thread (tp
);
2010 clear_proceed_status (void)
2014 /* In all-stop mode, delete the per-thread status of all
2015 threads, even if inferior_ptid is null_ptid, there may be
2016 threads on the list. E.g., we may be launching a new
2017 process, while selecting the executable. */
2018 iterate_over_threads (clear_proceed_status_callback
, NULL
);
2021 if (!ptid_equal (inferior_ptid
, null_ptid
))
2023 struct inferior
*inferior
;
2027 /* If in non-stop mode, only delete the per-thread status of
2028 the current thread. */
2029 clear_proceed_status_thread (inferior_thread ());
2032 inferior
= current_inferior ();
2033 inferior
->control
.stop_soon
= NO_STOP_QUIETLY
;
2036 stop_after_trap
= 0;
2038 observer_notify_about_to_proceed ();
2042 regcache_xfree (stop_registers
);
2043 stop_registers
= NULL
;
2047 /* Check the current thread against the thread that reported the most recent
2048 event. If a step-over is required return TRUE and set the current thread
2049 to the old thread. Otherwise return FALSE.
2051 This should be suitable for any targets that support threads. */
2054 prepare_to_proceed (int step
)
2057 struct target_waitstatus wait_status
;
2058 int schedlock_enabled
;
2060 /* With non-stop mode on, threads are always handled individually. */
2061 gdb_assert (! non_stop
);
2063 /* Get the last target status returned by target_wait(). */
2064 get_last_target_status (&wait_ptid
, &wait_status
);
2066 /* Make sure we were stopped at a breakpoint. */
2067 if (wait_status
.kind
!= TARGET_WAITKIND_STOPPED
2068 || (wait_status
.value
.sig
!= GDB_SIGNAL_TRAP
2069 && wait_status
.value
.sig
!= GDB_SIGNAL_ILL
2070 && wait_status
.value
.sig
!= GDB_SIGNAL_SEGV
2071 && wait_status
.value
.sig
!= GDB_SIGNAL_EMT
))
2076 schedlock_enabled
= (scheduler_mode
== schedlock_on
2077 || (scheduler_mode
== schedlock_step
2080 /* Don't switch over to WAIT_PTID if scheduler locking is on. */
2081 if (schedlock_enabled
)
2084 /* Don't switch over if we're about to resume some other process
2085 other than WAIT_PTID's, and schedule-multiple is off. */
2087 && ptid_get_pid (wait_ptid
) != ptid_get_pid (inferior_ptid
))
2090 /* Switched over from WAIT_PID. */
2091 if (!ptid_equal (wait_ptid
, minus_one_ptid
)
2092 && !ptid_equal (inferior_ptid
, wait_ptid
))
2094 struct regcache
*regcache
= get_thread_regcache (wait_ptid
);
2096 if (breakpoint_here_p (get_regcache_aspace (regcache
),
2097 regcache_read_pc (regcache
)))
2099 /* If stepping, remember current thread to switch back to. */
2101 deferred_step_ptid
= inferior_ptid
;
2103 /* Switch back to WAIT_PID thread. */
2104 switch_to_thread (wait_ptid
);
2107 fprintf_unfiltered (gdb_stdlog
,
2108 "infrun: prepare_to_proceed (step=%d), "
2109 "switched to [%s]\n",
2110 step
, target_pid_to_str (inferior_ptid
));
2112 /* We return 1 to indicate that there is a breakpoint here,
2113 so we need to step over it before continuing to avoid
2114 hitting it straight away. */
2122 /* Basic routine for continuing the program in various fashions.
2124 ADDR is the address to resume at, or -1 for resume where stopped.
2125 SIGGNAL is the signal to give it, or 0 for none,
2126 or -1 for act according to how it stopped.
2127 STEP is nonzero if should trap after one instruction.
2128 -1 means return after that and print nothing.
2129 You should probably set various step_... variables
2130 before calling here, if you are stepping.
2132 You should call clear_proceed_status before calling proceed. */
2135 proceed (CORE_ADDR addr
, enum gdb_signal siggnal
, int step
)
2137 struct regcache
*regcache
;
2138 struct gdbarch
*gdbarch
;
2139 struct thread_info
*tp
;
2141 struct address_space
*aspace
;
2142 /* GDB may force the inferior to step due to various reasons. */
2145 /* If we're stopped at a fork/vfork, follow the branch set by the
2146 "set follow-fork-mode" command; otherwise, we'll just proceed
2147 resuming the current thread. */
2148 if (!follow_fork ())
2150 /* The target for some reason decided not to resume. */
2152 if (target_can_async_p ())
2153 inferior_event_handler (INF_EXEC_COMPLETE
, NULL
);
2157 /* We'll update this if & when we switch to a new thread. */
2158 previous_inferior_ptid
= inferior_ptid
;
2160 regcache
= get_current_regcache ();
2161 gdbarch
= get_regcache_arch (regcache
);
2162 aspace
= get_regcache_aspace (regcache
);
2163 pc
= regcache_read_pc (regcache
);
2166 step_start_function
= find_pc_function (pc
);
2168 stop_after_trap
= 1;
2170 if (addr
== (CORE_ADDR
) -1)
2172 if (pc
== stop_pc
&& breakpoint_here_p (aspace
, pc
)
2173 && execution_direction
!= EXEC_REVERSE
)
2174 /* There is a breakpoint at the address we will resume at,
2175 step one instruction before inserting breakpoints so that
2176 we do not stop right away (and report a second hit at this
2179 Note, we don't do this in reverse, because we won't
2180 actually be executing the breakpoint insn anyway.
2181 We'll be (un-)executing the previous instruction. */
2184 else if (gdbarch_single_step_through_delay_p (gdbarch
)
2185 && gdbarch_single_step_through_delay (gdbarch
,
2186 get_current_frame ()))
2187 /* We stepped onto an instruction that needs to be stepped
2188 again before re-inserting the breakpoint, do so. */
2193 regcache_write_pc (regcache
, addr
);
2197 fprintf_unfiltered (gdb_stdlog
,
2198 "infrun: proceed (addr=%s, signal=%d, step=%d)\n",
2199 paddress (gdbarch
, addr
), siggnal
, step
);
2202 /* In non-stop, each thread is handled individually. The context
2203 must already be set to the right thread here. */
2207 /* In a multi-threaded task we may select another thread and
2208 then continue or step.
2210 But if the old thread was stopped at a breakpoint, it will
2211 immediately cause another breakpoint stop without any
2212 execution (i.e. it will report a breakpoint hit incorrectly).
2213 So we must step over it first.
2215 prepare_to_proceed checks the current thread against the
2216 thread that reported the most recent event. If a step-over
2217 is required it returns TRUE and sets the current thread to
2219 if (prepare_to_proceed (step
))
2223 /* prepare_to_proceed may change the current thread. */
2224 tp
= inferior_thread ();
2228 tp
->control
.trap_expected
= 1;
2229 /* If displaced stepping is enabled, we can step over the
2230 breakpoint without hitting it, so leave all breakpoints
2231 inserted. Otherwise we need to disable all breakpoints, step
2232 one instruction, and then re-add them when that step is
2234 if (!use_displaced_stepping (gdbarch
))
2235 remove_breakpoints ();
2238 /* We can insert breakpoints if we're not trying to step over one,
2239 or if we are stepping over one but we're using displaced stepping
2241 if (! tp
->control
.trap_expected
|| use_displaced_stepping (gdbarch
))
2242 insert_breakpoints ();
2246 /* Pass the last stop signal to the thread we're resuming,
2247 irrespective of whether the current thread is the thread that
2248 got the last event or not. This was historically GDB's
2249 behaviour before keeping a stop_signal per thread. */
2251 struct thread_info
*last_thread
;
2253 struct target_waitstatus last_status
;
2255 get_last_target_status (&last_ptid
, &last_status
);
2256 if (!ptid_equal (inferior_ptid
, last_ptid
)
2257 && !ptid_equal (last_ptid
, null_ptid
)
2258 && !ptid_equal (last_ptid
, minus_one_ptid
))
2260 last_thread
= find_thread_ptid (last_ptid
);
2263 tp
->suspend
.stop_signal
= last_thread
->suspend
.stop_signal
;
2264 last_thread
->suspend
.stop_signal
= GDB_SIGNAL_0
;
2269 if (siggnal
!= GDB_SIGNAL_DEFAULT
)
2270 tp
->suspend
.stop_signal
= siggnal
;
2271 /* If this signal should not be seen by program,
2272 give it zero. Used for debugging signals. */
2273 else if (!signal_program
[tp
->suspend
.stop_signal
])
2274 tp
->suspend
.stop_signal
= GDB_SIGNAL_0
;
2276 annotate_starting ();
2278 /* Make sure that output from GDB appears before output from the
2280 gdb_flush (gdb_stdout
);
2282 /* Refresh prev_pc value just prior to resuming. This used to be
2283 done in stop_stepping, however, setting prev_pc there did not handle
2284 scenarios such as inferior function calls or returning from
2285 a function via the return command. In those cases, the prev_pc
2286 value was not set properly for subsequent commands. The prev_pc value
2287 is used to initialize the starting line number in the ecs. With an
2288 invalid value, the gdb next command ends up stopping at the position
2289 represented by the next line table entry past our start position.
2290 On platforms that generate one line table entry per line, this
2291 is not a problem. However, on the ia64, the compiler generates
2292 extraneous line table entries that do not increase the line number.
2293 When we issue the gdb next command on the ia64 after an inferior call
2294 or a return command, we often end up a few instructions forward, still
2295 within the original line we started.
2297 An attempt was made to refresh the prev_pc at the same time the
2298 execution_control_state is initialized (for instance, just before
2299 waiting for an inferior event). But this approach did not work
2300 because of platforms that use ptrace, where the pc register cannot
2301 be read unless the inferior is stopped. At that point, we are not
2302 guaranteed the inferior is stopped and so the regcache_read_pc() call
2303 can fail. Setting the prev_pc value here ensures the value is updated
2304 correctly when the inferior is stopped. */
2305 tp
->prev_pc
= regcache_read_pc (get_current_regcache ());
2307 /* Fill in with reasonable starting values. */
2308 init_thread_stepping_state (tp
);
2310 /* Reset to normal state. */
2311 init_infwait_state ();
2313 /* Resume inferior. */
2314 resume (force_step
|| step
|| bpstat_should_step (),
2315 tp
->suspend
.stop_signal
);
2317 /* Wait for it to stop (if not standalone)
2318 and in any case decode why it stopped, and act accordingly. */
2319 /* Do this only if we are not using the event loop, or if the target
2320 does not support asynchronous execution. */
2321 if (!target_can_async_p ())
2323 wait_for_inferior ();
2329 /* Start remote-debugging of a machine over a serial link. */
2332 start_remote (int from_tty
)
2334 struct inferior
*inferior
;
2336 inferior
= current_inferior ();
2337 inferior
->control
.stop_soon
= STOP_QUIETLY_REMOTE
;
2339 /* Always go on waiting for the target, regardless of the mode. */
2340 /* FIXME: cagney/1999-09-23: At present it isn't possible to
2341 indicate to wait_for_inferior that a target should timeout if
2342 nothing is returned (instead of just blocking). Because of this,
2343 targets expecting an immediate response need to, internally, set
2344 things up so that the target_wait() is forced to eventually
2346 /* FIXME: cagney/1999-09-24: It isn't possible for target_open() to
2347 differentiate to its caller what the state of the target is after
2348 the initial open has been performed. Here we're assuming that
2349 the target has stopped. It should be possible to eventually have
2350 target_open() return to the caller an indication that the target
2351 is currently running and GDB state should be set to the same as
2352 for an async run. */
2353 wait_for_inferior ();
2355 /* Now that the inferior has stopped, do any bookkeeping like
2356 loading shared libraries. We want to do this before normal_stop,
2357 so that the displayed frame is up to date. */
2358 post_create_inferior (¤t_target
, from_tty
);
2363 /* Initialize static vars when a new inferior begins. */
2366 init_wait_for_inferior (void)
2368 /* These are meaningless until the first time through wait_for_inferior. */
2370 breakpoint_init_inferior (inf_starting
);
2372 clear_proceed_status ();
2374 stepping_past_singlestep_breakpoint
= 0;
2375 deferred_step_ptid
= null_ptid
;
2377 target_last_wait_ptid
= minus_one_ptid
;
2379 previous_inferior_ptid
= inferior_ptid
;
2380 init_infwait_state ();
2382 /* Discard any skipped inlined frames. */
2383 clear_inline_frame_state (minus_one_ptid
);
2387 /* This enum encodes possible reasons for doing a target_wait, so that
2388 wfi can call target_wait in one place. (Ultimately the call will be
2389 moved out of the infinite loop entirely.) */
2393 infwait_normal_state
,
2394 infwait_thread_hop_state
,
2395 infwait_step_watch_state
,
2396 infwait_nonstep_watch_state
2399 /* The PTID we'll do a target_wait on.*/
2402 /* Current inferior wait state. */
2403 static enum infwait_states infwait_state
;
2405 /* Data to be passed around while handling an event. This data is
2406 discarded between events. */
2407 struct execution_control_state
2410 /* The thread that got the event, if this was a thread event; NULL
2412 struct thread_info
*event_thread
;
2414 struct target_waitstatus ws
;
2416 int stop_func_filled_in
;
2417 CORE_ADDR stop_func_start
;
2418 CORE_ADDR stop_func_end
;
2419 const char *stop_func_name
;
2423 static void handle_inferior_event (struct execution_control_state
*ecs
);
2425 static void handle_step_into_function (struct gdbarch
*gdbarch
,
2426 struct execution_control_state
*ecs
);
2427 static void handle_step_into_function_backward (struct gdbarch
*gdbarch
,
2428 struct execution_control_state
*ecs
);
2429 static void check_exception_resume (struct execution_control_state
*,
2430 struct frame_info
*);
2432 static void stop_stepping (struct execution_control_state
*ecs
);
2433 static void prepare_to_wait (struct execution_control_state
*ecs
);
2434 static void keep_going (struct execution_control_state
*ecs
);
2436 /* Callback for iterate over threads. If the thread is stopped, but
2437 the user/frontend doesn't know about that yet, go through
2438 normal_stop, as if the thread had just stopped now. ARG points at
2439 a ptid. If PTID is MINUS_ONE_PTID, applies to all threads. If
2440 ptid_is_pid(PTID) is true, applies to all threads of the process
2441 pointed at by PTID. Otherwise, apply only to the thread pointed by
2445 infrun_thread_stop_requested_callback (struct thread_info
*info
, void *arg
)
2447 ptid_t ptid
= * (ptid_t
*) arg
;
2449 if ((ptid_equal (info
->ptid
, ptid
)
2450 || ptid_equal (minus_one_ptid
, ptid
)
2451 || (ptid_is_pid (ptid
)
2452 && ptid_get_pid (ptid
) == ptid_get_pid (info
->ptid
)))
2453 && is_running (info
->ptid
)
2454 && !is_executing (info
->ptid
))
2456 struct cleanup
*old_chain
;
2457 struct execution_control_state ecss
;
2458 struct execution_control_state
*ecs
= &ecss
;
2460 memset (ecs
, 0, sizeof (*ecs
));
2462 old_chain
= make_cleanup_restore_current_thread ();
2464 /* Go through handle_inferior_event/normal_stop, so we always
2465 have consistent output as if the stop event had been
2467 ecs
->ptid
= info
->ptid
;
2468 ecs
->event_thread
= find_thread_ptid (info
->ptid
);
2469 ecs
->ws
.kind
= TARGET_WAITKIND_STOPPED
;
2470 ecs
->ws
.value
.sig
= GDB_SIGNAL_0
;
2472 handle_inferior_event (ecs
);
2474 if (!ecs
->wait_some_more
)
2476 struct thread_info
*tp
;
2480 /* Finish off the continuations. */
2481 tp
= inferior_thread ();
2482 do_all_intermediate_continuations_thread (tp
, 1);
2483 do_all_continuations_thread (tp
, 1);
2486 do_cleanups (old_chain
);
2492 /* This function is attached as a "thread_stop_requested" observer.
2493 Cleanup local state that assumed the PTID was to be resumed, and
2494 report the stop to the frontend. */
2497 infrun_thread_stop_requested (ptid_t ptid
)
2499 struct displaced_step_inferior_state
*displaced
;
2501 /* PTID was requested to stop. Remove it from the displaced
2502 stepping queue, so we don't try to resume it automatically. */
2504 for (displaced
= displaced_step_inferior_states
;
2506 displaced
= displaced
->next
)
2508 struct displaced_step_request
*it
, **prev_next_p
;
2510 it
= displaced
->step_request_queue
;
2511 prev_next_p
= &displaced
->step_request_queue
;
2514 if (ptid_match (it
->ptid
, ptid
))
2516 *prev_next_p
= it
->next
;
2522 prev_next_p
= &it
->next
;
2529 iterate_over_threads (infrun_thread_stop_requested_callback
, &ptid
);
2533 infrun_thread_thread_exit (struct thread_info
*tp
, int silent
)
2535 if (ptid_equal (target_last_wait_ptid
, tp
->ptid
))
2536 nullify_last_target_wait_ptid ();
2539 /* Callback for iterate_over_threads. */
2542 delete_step_resume_breakpoint_callback (struct thread_info
*info
, void *data
)
2544 if (is_exited (info
->ptid
))
2547 delete_step_resume_breakpoint (info
);
2548 delete_exception_resume_breakpoint (info
);
2552 /* In all-stop, delete the step resume breakpoint of any thread that
2553 had one. In non-stop, delete the step resume breakpoint of the
2554 thread that just stopped. */
2557 delete_step_thread_step_resume_breakpoint (void)
2559 if (!target_has_execution
2560 || ptid_equal (inferior_ptid
, null_ptid
))
2561 /* If the inferior has exited, we have already deleted the step
2562 resume breakpoints out of GDB's lists. */
2567 /* If in non-stop mode, only delete the step-resume or
2568 longjmp-resume breakpoint of the thread that just stopped
2570 struct thread_info
*tp
= inferior_thread ();
2572 delete_step_resume_breakpoint (tp
);
2573 delete_exception_resume_breakpoint (tp
);
2576 /* In all-stop mode, delete all step-resume and longjmp-resume
2577 breakpoints of any thread that had them. */
2578 iterate_over_threads (delete_step_resume_breakpoint_callback
, NULL
);
2581 /* A cleanup wrapper. */
2584 delete_step_thread_step_resume_breakpoint_cleanup (void *arg
)
2586 delete_step_thread_step_resume_breakpoint ();
2589 /* Pretty print the results of target_wait, for debugging purposes. */
2592 print_target_wait_results (ptid_t waiton_ptid
, ptid_t result_ptid
,
2593 const struct target_waitstatus
*ws
)
2595 char *status_string
= target_waitstatus_to_string (ws
);
2596 struct ui_file
*tmp_stream
= mem_fileopen ();
2599 /* The text is split over several lines because it was getting too long.
2600 Call fprintf_unfiltered (gdb_stdlog) once so that the text is still
2601 output as a unit; we want only one timestamp printed if debug_timestamp
2604 fprintf_unfiltered (tmp_stream
,
2605 "infrun: target_wait (%d", PIDGET (waiton_ptid
));
2606 if (PIDGET (waiton_ptid
) != -1)
2607 fprintf_unfiltered (tmp_stream
,
2608 " [%s]", target_pid_to_str (waiton_ptid
));
2609 fprintf_unfiltered (tmp_stream
, ", status) =\n");
2610 fprintf_unfiltered (tmp_stream
,
2611 "infrun: %d [%s],\n",
2612 PIDGET (result_ptid
), target_pid_to_str (result_ptid
));
2613 fprintf_unfiltered (tmp_stream
,
2617 text
= ui_file_xstrdup (tmp_stream
, NULL
);
2619 /* This uses %s in part to handle %'s in the text, but also to avoid
2620 a gcc error: the format attribute requires a string literal. */
2621 fprintf_unfiltered (gdb_stdlog
, "%s", text
);
2623 xfree (status_string
);
2625 ui_file_delete (tmp_stream
);
2628 /* Prepare and stabilize the inferior for detaching it. E.g.,
2629 detaching while a thread is displaced stepping is a recipe for
2630 crashing it, as nothing would readjust the PC out of the scratch
2634 prepare_for_detach (void)
2636 struct inferior
*inf
= current_inferior ();
2637 ptid_t pid_ptid
= pid_to_ptid (inf
->pid
);
2638 struct cleanup
*old_chain_1
;
2639 struct displaced_step_inferior_state
*displaced
;
2641 displaced
= get_displaced_stepping_state (inf
->pid
);
2643 /* Is any thread of this process displaced stepping? If not,
2644 there's nothing else to do. */
2645 if (displaced
== NULL
|| ptid_equal (displaced
->step_ptid
, null_ptid
))
2649 fprintf_unfiltered (gdb_stdlog
,
2650 "displaced-stepping in-process while detaching");
2652 old_chain_1
= make_cleanup_restore_integer (&inf
->detaching
);
2655 while (!ptid_equal (displaced
->step_ptid
, null_ptid
))
2657 struct cleanup
*old_chain_2
;
2658 struct execution_control_state ecss
;
2659 struct execution_control_state
*ecs
;
2662 memset (ecs
, 0, sizeof (*ecs
));
2664 overlay_cache_invalid
= 1;
2666 if (deprecated_target_wait_hook
)
2667 ecs
->ptid
= deprecated_target_wait_hook (pid_ptid
, &ecs
->ws
, 0);
2669 ecs
->ptid
= target_wait (pid_ptid
, &ecs
->ws
, 0);
2672 print_target_wait_results (pid_ptid
, ecs
->ptid
, &ecs
->ws
);
2674 /* If an error happens while handling the event, propagate GDB's
2675 knowledge of the executing state to the frontend/user running
2677 old_chain_2
= make_cleanup (finish_thread_state_cleanup
,
2680 /* Now figure out what to do with the result of the result. */
2681 handle_inferior_event (ecs
);
2683 /* No error, don't finish the state yet. */
2684 discard_cleanups (old_chain_2
);
2686 /* Breakpoints and watchpoints are not installed on the target
2687 at this point, and signals are passed directly to the
2688 inferior, so this must mean the process is gone. */
2689 if (!ecs
->wait_some_more
)
2691 discard_cleanups (old_chain_1
);
2692 error (_("Program exited while detaching"));
2696 discard_cleanups (old_chain_1
);
2699 /* Wait for control to return from inferior to debugger.
2701 If inferior gets a signal, we may decide to start it up again
2702 instead of returning. That is why there is a loop in this function.
2703 When this function actually returns it means the inferior
2704 should be left stopped and GDB should read more commands. */
2707 wait_for_inferior (void)
2709 struct cleanup
*old_cleanups
;
2713 (gdb_stdlog
, "infrun: wait_for_inferior ()\n");
2716 make_cleanup (delete_step_thread_step_resume_breakpoint_cleanup
, NULL
);
2720 struct execution_control_state ecss
;
2721 struct execution_control_state
*ecs
= &ecss
;
2722 struct cleanup
*old_chain
;
2724 memset (ecs
, 0, sizeof (*ecs
));
2726 overlay_cache_invalid
= 1;
2728 if (deprecated_target_wait_hook
)
2729 ecs
->ptid
= deprecated_target_wait_hook (waiton_ptid
, &ecs
->ws
, 0);
2731 ecs
->ptid
= target_wait (waiton_ptid
, &ecs
->ws
, 0);
2734 print_target_wait_results (waiton_ptid
, ecs
->ptid
, &ecs
->ws
);
2736 /* If an error happens while handling the event, propagate GDB's
2737 knowledge of the executing state to the frontend/user running
2739 old_chain
= make_cleanup (finish_thread_state_cleanup
, &minus_one_ptid
);
2741 /* Now figure out what to do with the result of the result. */
2742 handle_inferior_event (ecs
);
2744 /* No error, don't finish the state yet. */
2745 discard_cleanups (old_chain
);
2747 if (!ecs
->wait_some_more
)
2751 do_cleanups (old_cleanups
);
2754 /* Asynchronous version of wait_for_inferior. It is called by the
2755 event loop whenever a change of state is detected on the file
2756 descriptor corresponding to the target. It can be called more than
2757 once to complete a single execution command. In such cases we need
2758 to keep the state in a global variable ECSS. If it is the last time
2759 that this function is called for a single execution command, then
2760 report to the user that the inferior has stopped, and do the
2761 necessary cleanups. */
2764 fetch_inferior_event (void *client_data
)
2766 struct execution_control_state ecss
;
2767 struct execution_control_state
*ecs
= &ecss
;
2768 struct cleanup
*old_chain
= make_cleanup (null_cleanup
, NULL
);
2769 struct cleanup
*ts_old_chain
;
2770 int was_sync
= sync_execution
;
2773 memset (ecs
, 0, sizeof (*ecs
));
2775 /* We're handling a live event, so make sure we're doing live
2776 debugging. If we're looking at traceframes while the target is
2777 running, we're going to need to get back to that mode after
2778 handling the event. */
2781 make_cleanup_restore_current_traceframe ();
2782 set_current_traceframe (-1);
2786 /* In non-stop mode, the user/frontend should not notice a thread
2787 switch due to internal events. Make sure we reverse to the
2788 user selected thread and frame after handling the event and
2789 running any breakpoint commands. */
2790 make_cleanup_restore_current_thread ();
2792 overlay_cache_invalid
= 1;
2794 make_cleanup_restore_integer (&execution_direction
);
2795 execution_direction
= target_execution_direction ();
2797 if (deprecated_target_wait_hook
)
2799 deprecated_target_wait_hook (waiton_ptid
, &ecs
->ws
, TARGET_WNOHANG
);
2801 ecs
->ptid
= target_wait (waiton_ptid
, &ecs
->ws
, TARGET_WNOHANG
);
2804 print_target_wait_results (waiton_ptid
, ecs
->ptid
, &ecs
->ws
);
2806 /* If an error happens while handling the event, propagate GDB's
2807 knowledge of the executing state to the frontend/user running
2810 ts_old_chain
= make_cleanup (finish_thread_state_cleanup
, &minus_one_ptid
);
2812 ts_old_chain
= make_cleanup (finish_thread_state_cleanup
, &ecs
->ptid
);
2814 /* Get executed before make_cleanup_restore_current_thread above to apply
2815 still for the thread which has thrown the exception. */
2816 make_bpstat_clear_actions_cleanup ();
2818 /* Now figure out what to do with the result of the result. */
2819 handle_inferior_event (ecs
);
2821 if (!ecs
->wait_some_more
)
2823 struct inferior
*inf
= find_inferior_pid (ptid_get_pid (ecs
->ptid
));
2825 delete_step_thread_step_resume_breakpoint ();
2827 /* We may not find an inferior if this was a process exit. */
2828 if (inf
== NULL
|| inf
->control
.stop_soon
== NO_STOP_QUIETLY
)
2831 if (target_has_execution
2832 && ecs
->ws
.kind
!= TARGET_WAITKIND_NO_RESUMED
2833 && ecs
->ws
.kind
!= TARGET_WAITKIND_EXITED
2834 && ecs
->ws
.kind
!= TARGET_WAITKIND_SIGNALLED
2835 && ecs
->event_thread
->step_multi
2836 && ecs
->event_thread
->control
.stop_step
)
2837 inferior_event_handler (INF_EXEC_CONTINUE
, NULL
);
2840 inferior_event_handler (INF_EXEC_COMPLETE
, NULL
);
2845 /* No error, don't finish the thread states yet. */
2846 discard_cleanups (ts_old_chain
);
2848 /* Revert thread and frame. */
2849 do_cleanups (old_chain
);
2851 /* If the inferior was in sync execution mode, and now isn't,
2852 restore the prompt (a synchronous execution command has finished,
2853 and we're ready for input). */
2854 if (interpreter_async
&& was_sync
&& !sync_execution
)
2855 display_gdb_prompt (0);
2859 && exec_done_display_p
2860 && (ptid_equal (inferior_ptid
, null_ptid
)
2861 || !is_running (inferior_ptid
)))
2862 printf_unfiltered (_("completed.\n"));
2865 /* Record the frame and location we're currently stepping through. */
2867 set_step_info (struct frame_info
*frame
, struct symtab_and_line sal
)
2869 struct thread_info
*tp
= inferior_thread ();
2871 tp
->control
.step_frame_id
= get_frame_id (frame
);
2872 tp
->control
.step_stack_frame_id
= get_stack_frame_id (frame
);
2874 tp
->current_symtab
= sal
.symtab
;
2875 tp
->current_line
= sal
.line
;
2878 /* Clear context switchable stepping state. */
2881 init_thread_stepping_state (struct thread_info
*tss
)
2883 tss
->stepping_over_breakpoint
= 0;
2884 tss
->step_after_step_resume_breakpoint
= 0;
2887 /* Return the cached copy of the last pid/waitstatus returned by
2888 target_wait()/deprecated_target_wait_hook(). The data is actually
2889 cached by handle_inferior_event(), which gets called immediately
2890 after target_wait()/deprecated_target_wait_hook(). */
2893 get_last_target_status (ptid_t
*ptidp
, struct target_waitstatus
*status
)
2895 *ptidp
= target_last_wait_ptid
;
2896 *status
= target_last_waitstatus
;
2900 nullify_last_target_wait_ptid (void)
2902 target_last_wait_ptid
= minus_one_ptid
;
2905 /* Switch thread contexts. */
2908 context_switch (ptid_t ptid
)
2910 if (debug_infrun
&& !ptid_equal (ptid
, inferior_ptid
))
2912 fprintf_unfiltered (gdb_stdlog
, "infrun: Switching context from %s ",
2913 target_pid_to_str (inferior_ptid
));
2914 fprintf_unfiltered (gdb_stdlog
, "to %s\n",
2915 target_pid_to_str (ptid
));
2918 switch_to_thread (ptid
);
2922 adjust_pc_after_break (struct execution_control_state
*ecs
)
2924 struct regcache
*regcache
;
2925 struct gdbarch
*gdbarch
;
2926 struct address_space
*aspace
;
2927 CORE_ADDR breakpoint_pc
;
2929 /* If we've hit a breakpoint, we'll normally be stopped with SIGTRAP. If
2930 we aren't, just return.
2932 We assume that waitkinds other than TARGET_WAITKIND_STOPPED are not
2933 affected by gdbarch_decr_pc_after_break. Other waitkinds which are
2934 implemented by software breakpoints should be handled through the normal
2937 NOTE drow/2004-01-31: On some targets, breakpoints may generate
2938 different signals (SIGILL or SIGEMT for instance), but it is less
2939 clear where the PC is pointing afterwards. It may not match
2940 gdbarch_decr_pc_after_break. I don't know any specific target that
2941 generates these signals at breakpoints (the code has been in GDB since at
2942 least 1992) so I can not guess how to handle them here.
2944 In earlier versions of GDB, a target with
2945 gdbarch_have_nonsteppable_watchpoint would have the PC after hitting a
2946 watchpoint affected by gdbarch_decr_pc_after_break. I haven't found any
2947 target with both of these set in GDB history, and it seems unlikely to be
2948 correct, so gdbarch_have_nonsteppable_watchpoint is not checked here. */
2950 if (ecs
->ws
.kind
!= TARGET_WAITKIND_STOPPED
)
2953 if (ecs
->ws
.value
.sig
!= GDB_SIGNAL_TRAP
)
2956 /* In reverse execution, when a breakpoint is hit, the instruction
2957 under it has already been de-executed. The reported PC always
2958 points at the breakpoint address, so adjusting it further would
2959 be wrong. E.g., consider this case on a decr_pc_after_break == 1
2962 B1 0x08000000 : INSN1
2963 B2 0x08000001 : INSN2
2965 PC -> 0x08000003 : INSN4
2967 Say you're stopped at 0x08000003 as above. Reverse continuing
2968 from that point should hit B2 as below. Reading the PC when the
2969 SIGTRAP is reported should read 0x08000001 and INSN2 should have
2970 been de-executed already.
2972 B1 0x08000000 : INSN1
2973 B2 PC -> 0x08000001 : INSN2
2977 We can't apply the same logic as for forward execution, because
2978 we would wrongly adjust the PC to 0x08000000, since there's a
2979 breakpoint at PC - 1. We'd then report a hit on B1, although
2980 INSN1 hadn't been de-executed yet. Doing nothing is the correct
2982 if (execution_direction
== EXEC_REVERSE
)
2985 /* If this target does not decrement the PC after breakpoints, then
2986 we have nothing to do. */
2987 regcache
= get_thread_regcache (ecs
->ptid
);
2988 gdbarch
= get_regcache_arch (regcache
);
2989 if (gdbarch_decr_pc_after_break (gdbarch
) == 0)
2992 aspace
= get_regcache_aspace (regcache
);
2994 /* Find the location where (if we've hit a breakpoint) the
2995 breakpoint would be. */
2996 breakpoint_pc
= regcache_read_pc (regcache
)
2997 - gdbarch_decr_pc_after_break (gdbarch
);
2999 /* Check whether there actually is a software breakpoint inserted at
3002 If in non-stop mode, a race condition is possible where we've
3003 removed a breakpoint, but stop events for that breakpoint were
3004 already queued and arrive later. To suppress those spurious
3005 SIGTRAPs, we keep a list of such breakpoint locations for a bit,
3006 and retire them after a number of stop events are reported. */
3007 if (software_breakpoint_inserted_here_p (aspace
, breakpoint_pc
)
3008 || (non_stop
&& moribund_breakpoint_here_p (aspace
, breakpoint_pc
)))
3010 struct cleanup
*old_cleanups
= NULL
;
3013 old_cleanups
= record_gdb_operation_disable_set ();
3015 /* When using hardware single-step, a SIGTRAP is reported for both
3016 a completed single-step and a software breakpoint. Need to
3017 differentiate between the two, as the latter needs adjusting
3018 but the former does not.
3020 The SIGTRAP can be due to a completed hardware single-step only if
3021 - we didn't insert software single-step breakpoints
3022 - the thread to be examined is still the current thread
3023 - this thread is currently being stepped
3025 If any of these events did not occur, we must have stopped due
3026 to hitting a software breakpoint, and have to back up to the
3029 As a special case, we could have hardware single-stepped a
3030 software breakpoint. In this case (prev_pc == breakpoint_pc),
3031 we also need to back up to the breakpoint address. */
3033 if (singlestep_breakpoints_inserted_p
3034 || !ptid_equal (ecs
->ptid
, inferior_ptid
)
3035 || !currently_stepping (ecs
->event_thread
)
3036 || ecs
->event_thread
->prev_pc
== breakpoint_pc
)
3037 regcache_write_pc (regcache
, breakpoint_pc
);
3040 do_cleanups (old_cleanups
);
3045 init_infwait_state (void)
3047 waiton_ptid
= pid_to_ptid (-1);
3048 infwait_state
= infwait_normal_state
;
3052 stepped_in_from (struct frame_info
*frame
, struct frame_id step_frame_id
)
3054 for (frame
= get_prev_frame (frame
);
3056 frame
= get_prev_frame (frame
))
3058 if (frame_id_eq (get_frame_id (frame
), step_frame_id
))
3060 if (get_frame_type (frame
) != INLINE_FRAME
)
3067 /* Auxiliary function that handles syscall entry/return events.
3068 It returns 1 if the inferior should keep going (and GDB
3069 should ignore the event), or 0 if the event deserves to be
3073 handle_syscall_event (struct execution_control_state
*ecs
)
3075 struct regcache
*regcache
;
3078 if (!ptid_equal (ecs
->ptid
, inferior_ptid
))
3079 context_switch (ecs
->ptid
);
3081 regcache
= get_thread_regcache (ecs
->ptid
);
3082 syscall_number
= ecs
->ws
.value
.syscall_number
;
3083 stop_pc
= regcache_read_pc (regcache
);
3085 if (catch_syscall_enabled () > 0
3086 && catching_syscall_number (syscall_number
) > 0)
3088 enum bpstat_signal_value sval
;
3091 fprintf_unfiltered (gdb_stdlog
, "infrun: syscall number = '%d'\n",
3094 ecs
->event_thread
->control
.stop_bpstat
3095 = bpstat_stop_status (get_regcache_aspace (regcache
),
3096 stop_pc
, ecs
->ptid
, &ecs
->ws
);
3098 sval
= bpstat_explains_signal (ecs
->event_thread
->control
.stop_bpstat
);
3099 ecs
->random_signal
= sval
== BPSTAT_SIGNAL_NO
;
3101 if (!ecs
->random_signal
)
3103 /* Catchpoint hit. */
3104 ecs
->event_thread
->suspend
.stop_signal
= GDB_SIGNAL_TRAP
;
3109 /* If no catchpoint triggered for this, then keep going. */
3110 ecs
->event_thread
->suspend
.stop_signal
= GDB_SIGNAL_0
;
3115 /* Clear the supplied execution_control_state's stop_func_* fields. */
3118 clear_stop_func (struct execution_control_state
*ecs
)
3120 ecs
->stop_func_filled_in
= 0;
3121 ecs
->stop_func_start
= 0;
3122 ecs
->stop_func_end
= 0;
3123 ecs
->stop_func_name
= NULL
;
3126 /* Lazily fill in the execution_control_state's stop_func_* fields. */
3129 fill_in_stop_func (struct gdbarch
*gdbarch
,
3130 struct execution_control_state
*ecs
)
3132 if (!ecs
->stop_func_filled_in
)
3134 /* Don't care about return value; stop_func_start and stop_func_name
3135 will both be 0 if it doesn't work. */
3136 find_pc_partial_function (stop_pc
, &ecs
->stop_func_name
,
3137 &ecs
->stop_func_start
, &ecs
->stop_func_end
);
3138 ecs
->stop_func_start
3139 += gdbarch_deprecated_function_start_offset (gdbarch
);
3141 ecs
->stop_func_filled_in
= 1;
3145 /* Given an execution control state that has been freshly filled in
3146 by an event from the inferior, figure out what it means and take
3147 appropriate action. */
3150 handle_inferior_event (struct execution_control_state
*ecs
)
3152 struct frame_info
*frame
;
3153 struct gdbarch
*gdbarch
;
3154 int stopped_by_watchpoint
;
3155 int stepped_after_stopped_by_watchpoint
= 0;
3156 struct symtab_and_line stop_pc_sal
;
3157 enum stop_kind stop_soon
;
3159 if (ecs
->ws
.kind
== TARGET_WAITKIND_IGNORE
)
3161 /* We had an event in the inferior, but we are not interested in
3162 handling it at this level. The lower layers have already
3163 done what needs to be done, if anything.
3165 One of the possible circumstances for this is when the
3166 inferior produces output for the console. The inferior has
3167 not stopped, and we are ignoring the event. Another possible
3168 circumstance is any event which the lower level knows will be
3169 reported multiple times without an intervening resume. */
3171 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_IGNORE\n");
3172 prepare_to_wait (ecs
);
3176 if (ecs
->ws
.kind
== TARGET_WAITKIND_NO_RESUMED
3177 && target_can_async_p () && !sync_execution
)
3179 /* There were no unwaited-for children left in the target, but,
3180 we're not synchronously waiting for events either. Just
3181 ignore. Otherwise, if we were running a synchronous
3182 execution command, we need to cancel it and give the user
3183 back the terminal. */
3185 fprintf_unfiltered (gdb_stdlog
,
3186 "infrun: TARGET_WAITKIND_NO_RESUMED (ignoring)\n");
3187 prepare_to_wait (ecs
);
3191 if (ecs
->ws
.kind
!= TARGET_WAITKIND_EXITED
3192 && ecs
->ws
.kind
!= TARGET_WAITKIND_SIGNALLED
3193 && ecs
->ws
.kind
!= TARGET_WAITKIND_NO_RESUMED
)
3195 struct inferior
*inf
= find_inferior_pid (ptid_get_pid (ecs
->ptid
));
3198 stop_soon
= inf
->control
.stop_soon
;
3201 stop_soon
= NO_STOP_QUIETLY
;
3203 /* Cache the last pid/waitstatus. */
3204 target_last_wait_ptid
= ecs
->ptid
;
3205 target_last_waitstatus
= ecs
->ws
;
3207 /* Always clear state belonging to the previous time we stopped. */
3208 stop_stack_dummy
= STOP_NONE
;
3210 if (ecs
->ws
.kind
== TARGET_WAITKIND_NO_RESUMED
)
3212 /* No unwaited-for children left. IOW, all resumed children
3215 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_NO_RESUMED\n");
3217 stop_print_frame
= 0;
3218 stop_stepping (ecs
);
3222 if (ecs
->ws
.kind
!= TARGET_WAITKIND_EXITED
3223 && ecs
->ws
.kind
!= TARGET_WAITKIND_SIGNALLED
)
3225 ecs
->event_thread
= find_thread_ptid (ecs
->ptid
);
3226 /* If it's a new thread, add it to the thread database. */
3227 if (ecs
->event_thread
== NULL
)
3228 ecs
->event_thread
= add_thread (ecs
->ptid
);
3231 /* Dependent on valid ECS->EVENT_THREAD. */
3232 adjust_pc_after_break (ecs
);
3234 /* Dependent on the current PC value modified by adjust_pc_after_break. */
3235 reinit_frame_cache ();
3237 breakpoint_retire_moribund ();
3239 /* First, distinguish signals caused by the debugger from signals
3240 that have to do with the program's own actions. Note that
3241 breakpoint insns may cause SIGTRAP or SIGILL or SIGEMT, depending
3242 on the operating system version. Here we detect when a SIGILL or
3243 SIGEMT is really a breakpoint and change it to SIGTRAP. We do
3244 something similar for SIGSEGV, since a SIGSEGV will be generated
3245 when we're trying to execute a breakpoint instruction on a
3246 non-executable stack. This happens for call dummy breakpoints
3247 for architectures like SPARC that place call dummies on the
3249 if (ecs
->ws
.kind
== TARGET_WAITKIND_STOPPED
3250 && (ecs
->ws
.value
.sig
== GDB_SIGNAL_ILL
3251 || ecs
->ws
.value
.sig
== GDB_SIGNAL_SEGV
3252 || ecs
->ws
.value
.sig
== GDB_SIGNAL_EMT
))
3254 struct regcache
*regcache
= get_thread_regcache (ecs
->ptid
);
3256 if (breakpoint_inserted_here_p (get_regcache_aspace (regcache
),
3257 regcache_read_pc (regcache
)))
3260 fprintf_unfiltered (gdb_stdlog
,
3261 "infrun: Treating signal as SIGTRAP\n");
3262 ecs
->ws
.value
.sig
= GDB_SIGNAL_TRAP
;
3266 /* Mark the non-executing threads accordingly. In all-stop, all
3267 threads of all processes are stopped when we get any event
3268 reported. In non-stop mode, only the event thread stops. If
3269 we're handling a process exit in non-stop mode, there's nothing
3270 to do, as threads of the dead process are gone, and threads of
3271 any other process were left running. */
3273 set_executing (minus_one_ptid
, 0);
3274 else if (ecs
->ws
.kind
!= TARGET_WAITKIND_SIGNALLED
3275 && ecs
->ws
.kind
!= TARGET_WAITKIND_EXITED
)
3276 set_executing (ecs
->ptid
, 0);
3278 switch (infwait_state
)
3280 case infwait_thread_hop_state
:
3282 fprintf_unfiltered (gdb_stdlog
, "infrun: infwait_thread_hop_state\n");
3285 case infwait_normal_state
:
3287 fprintf_unfiltered (gdb_stdlog
, "infrun: infwait_normal_state\n");
3290 case infwait_step_watch_state
:
3292 fprintf_unfiltered (gdb_stdlog
,
3293 "infrun: infwait_step_watch_state\n");
3295 stepped_after_stopped_by_watchpoint
= 1;
3298 case infwait_nonstep_watch_state
:
3300 fprintf_unfiltered (gdb_stdlog
,
3301 "infrun: infwait_nonstep_watch_state\n");
3302 insert_breakpoints ();
3304 /* FIXME-maybe: is this cleaner than setting a flag? Does it
3305 handle things like signals arriving and other things happening
3306 in combination correctly? */
3307 stepped_after_stopped_by_watchpoint
= 1;
3311 internal_error (__FILE__
, __LINE__
, _("bad switch"));
3314 infwait_state
= infwait_normal_state
;
3315 waiton_ptid
= pid_to_ptid (-1);
3317 switch (ecs
->ws
.kind
)
3319 case TARGET_WAITKIND_LOADED
:
3321 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_LOADED\n");
3322 /* Ignore gracefully during startup of the inferior, as it might
3323 be the shell which has just loaded some objects, otherwise
3324 add the symbols for the newly loaded objects. Also ignore at
3325 the beginning of an attach or remote session; we will query
3326 the full list of libraries once the connection is
3328 if (stop_soon
== NO_STOP_QUIETLY
)
3330 struct regcache
*regcache
;
3331 enum bpstat_signal_value sval
;
3333 if (!ptid_equal (ecs
->ptid
, inferior_ptid
))
3334 context_switch (ecs
->ptid
);
3335 regcache
= get_thread_regcache (ecs
->ptid
);
3337 handle_solib_event ();
3339 ecs
->event_thread
->control
.stop_bpstat
3340 = bpstat_stop_status (get_regcache_aspace (regcache
),
3341 stop_pc
, ecs
->ptid
, &ecs
->ws
);
3344 = bpstat_explains_signal (ecs
->event_thread
->control
.stop_bpstat
);
3345 ecs
->random_signal
= sval
== BPSTAT_SIGNAL_NO
;
3347 if (!ecs
->random_signal
)
3349 /* A catchpoint triggered. */
3350 ecs
->event_thread
->suspend
.stop_signal
= GDB_SIGNAL_TRAP
;
3351 goto process_event_stop_test
;
3354 /* If requested, stop when the dynamic linker notifies
3355 gdb of events. This allows the user to get control
3356 and place breakpoints in initializer routines for
3357 dynamically loaded objects (among other things). */
3358 ecs
->event_thread
->suspend
.stop_signal
= GDB_SIGNAL_0
;
3359 if (stop_on_solib_events
)
3361 /* Make sure we print "Stopped due to solib-event" in
3363 stop_print_frame
= 1;
3365 stop_stepping (ecs
);
3370 /* If we are skipping through a shell, or through shared library
3371 loading that we aren't interested in, resume the program. If
3372 we're running the program normally, also resume. But stop if
3373 we're attaching or setting up a remote connection. */
3374 if (stop_soon
== STOP_QUIETLY
|| stop_soon
== NO_STOP_QUIETLY
)
3376 if (!ptid_equal (ecs
->ptid
, inferior_ptid
))
3377 context_switch (ecs
->ptid
);
3379 /* Loading of shared libraries might have changed breakpoint
3380 addresses. Make sure new breakpoints are inserted. */
3381 if (stop_soon
== NO_STOP_QUIETLY
3382 && !breakpoints_always_inserted_mode ())
3383 insert_breakpoints ();
3384 resume (0, GDB_SIGNAL_0
);
3385 prepare_to_wait (ecs
);
3391 case TARGET_WAITKIND_SPURIOUS
:
3393 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_SPURIOUS\n");
3394 if (!ptid_equal (ecs
->ptid
, inferior_ptid
))
3395 context_switch (ecs
->ptid
);
3396 resume (0, GDB_SIGNAL_0
);
3397 prepare_to_wait (ecs
);
3400 case TARGET_WAITKIND_EXITED
:
3401 case TARGET_WAITKIND_SIGNALLED
:
3404 if (ecs
->ws
.kind
== TARGET_WAITKIND_EXITED
)
3405 fprintf_unfiltered (gdb_stdlog
,
3406 "infrun: TARGET_WAITKIND_EXITED\n");
3408 fprintf_unfiltered (gdb_stdlog
,
3409 "infrun: TARGET_WAITKIND_SIGNALLED\n");
3412 inferior_ptid
= ecs
->ptid
;
3413 set_current_inferior (find_inferior_pid (ptid_get_pid (ecs
->ptid
)));
3414 set_current_program_space (current_inferior ()->pspace
);
3415 handle_vfork_child_exec_or_exit (0);
3416 target_terminal_ours (); /* Must do this before mourn anyway. */
3418 if (ecs
->ws
.kind
== TARGET_WAITKIND_EXITED
)
3420 /* Record the exit code in the convenience variable $_exitcode, so
3421 that the user can inspect this again later. */
3422 set_internalvar_integer (lookup_internalvar ("_exitcode"),
3423 (LONGEST
) ecs
->ws
.value
.integer
);
3425 /* Also record this in the inferior itself. */
3426 current_inferior ()->has_exit_code
= 1;
3427 current_inferior ()->exit_code
= (LONGEST
) ecs
->ws
.value
.integer
;
3429 print_exited_reason (ecs
->ws
.value
.integer
);
3432 print_signal_exited_reason (ecs
->ws
.value
.sig
);
3434 gdb_flush (gdb_stdout
);
3435 target_mourn_inferior ();
3436 singlestep_breakpoints_inserted_p
= 0;
3437 cancel_single_step_breakpoints ();
3438 stop_print_frame
= 0;
3439 stop_stepping (ecs
);
3442 /* The following are the only cases in which we keep going;
3443 the above cases end in a continue or goto. */
3444 case TARGET_WAITKIND_FORKED
:
3445 case TARGET_WAITKIND_VFORKED
:
3448 if (ecs
->ws
.kind
== TARGET_WAITKIND_FORKED
)
3449 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_FORKED\n");
3451 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_VFORKED\n");
3454 /* Check whether the inferior is displaced stepping. */
3456 struct regcache
*regcache
= get_thread_regcache (ecs
->ptid
);
3457 struct gdbarch
*gdbarch
= get_regcache_arch (regcache
);
3458 struct displaced_step_inferior_state
*displaced
3459 = get_displaced_stepping_state (ptid_get_pid (ecs
->ptid
));
3461 /* If checking displaced stepping is supported, and thread
3462 ecs->ptid is displaced stepping. */
3463 if (displaced
&& ptid_equal (displaced
->step_ptid
, ecs
->ptid
))
3465 struct inferior
*parent_inf
3466 = find_inferior_pid (ptid_get_pid (ecs
->ptid
));
3467 struct regcache
*child_regcache
;
3468 CORE_ADDR parent_pc
;
3470 /* GDB has got TARGET_WAITKIND_FORKED or TARGET_WAITKIND_VFORKED,
3471 indicating that the displaced stepping of syscall instruction
3472 has been done. Perform cleanup for parent process here. Note
3473 that this operation also cleans up the child process for vfork,
3474 because their pages are shared. */
3475 displaced_step_fixup (ecs
->ptid
, GDB_SIGNAL_TRAP
);
3477 if (ecs
->ws
.kind
== TARGET_WAITKIND_FORKED
)
3479 /* Restore scratch pad for child process. */
3480 displaced_step_restore (displaced
, ecs
->ws
.value
.related_pid
);
3483 /* Since the vfork/fork syscall instruction was executed in the scratchpad,
3484 the child's PC is also within the scratchpad. Set the child's PC
3485 to the parent's PC value, which has already been fixed up.
3486 FIXME: we use the parent's aspace here, although we're touching
3487 the child, because the child hasn't been added to the inferior
3488 list yet at this point. */
3491 = get_thread_arch_aspace_regcache (ecs
->ws
.value
.related_pid
,
3493 parent_inf
->aspace
);
3494 /* Read PC value of parent process. */
3495 parent_pc
= regcache_read_pc (regcache
);
3497 if (debug_displaced
)
3498 fprintf_unfiltered (gdb_stdlog
,
3499 "displaced: write child pc from %s to %s\n",
3501 regcache_read_pc (child_regcache
)),
3502 paddress (gdbarch
, parent_pc
));
3504 regcache_write_pc (child_regcache
, parent_pc
);
3508 if (!ptid_equal (ecs
->ptid
, inferior_ptid
))
3509 context_switch (ecs
->ptid
);
3511 /* Immediately detach breakpoints from the child before there's
3512 any chance of letting the user delete breakpoints from the
3513 breakpoint lists. If we don't do this early, it's easy to
3514 leave left over traps in the child, vis: "break foo; catch
3515 fork; c; <fork>; del; c; <child calls foo>". We only follow
3516 the fork on the last `continue', and by that time the
3517 breakpoint at "foo" is long gone from the breakpoint table.
3518 If we vforked, then we don't need to unpatch here, since both
3519 parent and child are sharing the same memory pages; we'll
3520 need to unpatch at follow/detach time instead to be certain
3521 that new breakpoints added between catchpoint hit time and
3522 vfork follow are detached. */
3523 if (ecs
->ws
.kind
!= TARGET_WAITKIND_VFORKED
)
3525 /* This won't actually modify the breakpoint list, but will
3526 physically remove the breakpoints from the child. */
3527 detach_breakpoints (ecs
->ws
.value
.related_pid
);
3530 if (singlestep_breakpoints_inserted_p
)
3532 /* Pull the single step breakpoints out of the target. */
3533 remove_single_step_breakpoints ();
3534 singlestep_breakpoints_inserted_p
= 0;
3537 /* In case the event is caught by a catchpoint, remember that
3538 the event is to be followed at the next resume of the thread,
3539 and not immediately. */
3540 ecs
->event_thread
->pending_follow
= ecs
->ws
;
3542 stop_pc
= regcache_read_pc (get_thread_regcache (ecs
->ptid
));
3544 ecs
->event_thread
->control
.stop_bpstat
3545 = bpstat_stop_status (get_regcache_aspace (get_current_regcache ()),
3546 stop_pc
, ecs
->ptid
, &ecs
->ws
);
3548 /* Note that we're interested in knowing the bpstat actually
3549 causes a stop, not just if it may explain the signal.
3550 Software watchpoints, for example, always appear in the
3553 = !bpstat_causes_stop (ecs
->event_thread
->control
.stop_bpstat
);
3555 /* If no catchpoint triggered for this, then keep going. */
3556 if (ecs
->random_signal
)
3562 = (follow_fork_mode_string
== follow_fork_mode_child
);
3564 ecs
->event_thread
->suspend
.stop_signal
= GDB_SIGNAL_0
;
3566 should_resume
= follow_fork ();
3569 child
= ecs
->ws
.value
.related_pid
;
3571 /* In non-stop mode, also resume the other branch. */
3572 if (non_stop
&& !detach_fork
)
3575 switch_to_thread (parent
);
3577 switch_to_thread (child
);
3579 ecs
->event_thread
= inferior_thread ();
3580 ecs
->ptid
= inferior_ptid
;
3585 switch_to_thread (child
);
3587 switch_to_thread (parent
);
3589 ecs
->event_thread
= inferior_thread ();
3590 ecs
->ptid
= inferior_ptid
;
3595 stop_stepping (ecs
);
3598 ecs
->event_thread
->suspend
.stop_signal
= GDB_SIGNAL_TRAP
;
3599 goto process_event_stop_test
;
3601 case TARGET_WAITKIND_VFORK_DONE
:
3602 /* Done with the shared memory region. Re-insert breakpoints in
3603 the parent, and keep going. */
3606 fprintf_unfiltered (gdb_stdlog
,
3607 "infrun: TARGET_WAITKIND_VFORK_DONE\n");
3609 if (!ptid_equal (ecs
->ptid
, inferior_ptid
))
3610 context_switch (ecs
->ptid
);
3612 current_inferior ()->waiting_for_vfork_done
= 0;
3613 current_inferior ()->pspace
->breakpoints_not_allowed
= 0;
3614 /* This also takes care of reinserting breakpoints in the
3615 previously locked inferior. */
3619 case TARGET_WAITKIND_EXECD
:
3621 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_EXECD\n");
3623 if (!ptid_equal (ecs
->ptid
, inferior_ptid
))
3624 context_switch (ecs
->ptid
);
3626 singlestep_breakpoints_inserted_p
= 0;
3627 cancel_single_step_breakpoints ();
3629 stop_pc
= regcache_read_pc (get_thread_regcache (ecs
->ptid
));
3631 /* Do whatever is necessary to the parent branch of the vfork. */
3632 handle_vfork_child_exec_or_exit (1);
3634 /* This causes the eventpoints and symbol table to be reset.
3635 Must do this now, before trying to determine whether to
3637 follow_exec (inferior_ptid
, ecs
->ws
.value
.execd_pathname
);
3639 ecs
->event_thread
->control
.stop_bpstat
3640 = bpstat_stop_status (get_regcache_aspace (get_current_regcache ()),
3641 stop_pc
, ecs
->ptid
, &ecs
->ws
);
3643 = (bpstat_explains_signal (ecs
->event_thread
->control
.stop_bpstat
)
3644 == BPSTAT_SIGNAL_NO
);
3646 /* Note that this may be referenced from inside
3647 bpstat_stop_status above, through inferior_has_execd. */
3648 xfree (ecs
->ws
.value
.execd_pathname
);
3649 ecs
->ws
.value
.execd_pathname
= NULL
;
3651 /* If no catchpoint triggered for this, then keep going. */
3652 if (ecs
->random_signal
)
3654 ecs
->event_thread
->suspend
.stop_signal
= GDB_SIGNAL_0
;
3658 ecs
->event_thread
->suspend
.stop_signal
= GDB_SIGNAL_TRAP
;
3659 goto process_event_stop_test
;
3661 /* Be careful not to try to gather much state about a thread
3662 that's in a syscall. It's frequently a losing proposition. */
3663 case TARGET_WAITKIND_SYSCALL_ENTRY
:
3665 fprintf_unfiltered (gdb_stdlog
,
3666 "infrun: TARGET_WAITKIND_SYSCALL_ENTRY\n");
3667 /* Getting the current syscall number. */
3668 if (handle_syscall_event (ecs
) != 0)
3670 goto process_event_stop_test
;
3672 /* Before examining the threads further, step this thread to
3673 get it entirely out of the syscall. (We get notice of the
3674 event when the thread is just on the verge of exiting a
3675 syscall. Stepping one instruction seems to get it back
3677 case TARGET_WAITKIND_SYSCALL_RETURN
:
3679 fprintf_unfiltered (gdb_stdlog
,
3680 "infrun: TARGET_WAITKIND_SYSCALL_RETURN\n");
3681 if (handle_syscall_event (ecs
) != 0)
3683 goto process_event_stop_test
;
3685 case TARGET_WAITKIND_STOPPED
:
3687 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_STOPPED\n");
3688 ecs
->event_thread
->suspend
.stop_signal
= ecs
->ws
.value
.sig
;
3691 case TARGET_WAITKIND_NO_HISTORY
:
3693 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_NO_HISTORY\n");
3694 /* Reverse execution: target ran out of history info. */
3696 /* Pull the single step breakpoints out of the target. */
3697 if (singlestep_breakpoints_inserted_p
)
3699 if (!ptid_equal (ecs
->ptid
, inferior_ptid
))
3700 context_switch (ecs
->ptid
);
3701 remove_single_step_breakpoints ();
3702 singlestep_breakpoints_inserted_p
= 0;
3704 stop_pc
= regcache_read_pc (get_thread_regcache (ecs
->ptid
));
3705 print_no_history_reason ();
3706 stop_stepping (ecs
);
3710 if (ecs
->ws
.kind
== TARGET_WAITKIND_STOPPED
)
3712 /* Do we need to clean up the state of a thread that has
3713 completed a displaced single-step? (Doing so usually affects
3714 the PC, so do it here, before we set stop_pc.) */
3715 displaced_step_fixup (ecs
->ptid
,
3716 ecs
->event_thread
->suspend
.stop_signal
);
3718 /* If we either finished a single-step or hit a breakpoint, but
3719 the user wanted this thread to be stopped, pretend we got a
3720 SIG0 (generic unsignaled stop). */
3722 if (ecs
->event_thread
->stop_requested
3723 && ecs
->event_thread
->suspend
.stop_signal
== GDB_SIGNAL_TRAP
)
3724 ecs
->event_thread
->suspend
.stop_signal
= GDB_SIGNAL_0
;
3727 stop_pc
= regcache_read_pc (get_thread_regcache (ecs
->ptid
));
3731 struct regcache
*regcache
= get_thread_regcache (ecs
->ptid
);
3732 struct gdbarch
*gdbarch
= get_regcache_arch (regcache
);
3733 struct cleanup
*old_chain
= save_inferior_ptid ();
3735 inferior_ptid
= ecs
->ptid
;
3737 fprintf_unfiltered (gdb_stdlog
, "infrun: stop_pc = %s\n",
3738 paddress (gdbarch
, stop_pc
));
3739 if (target_stopped_by_watchpoint ())
3743 fprintf_unfiltered (gdb_stdlog
, "infrun: stopped by watchpoint\n");
3745 if (target_stopped_data_address (¤t_target
, &addr
))
3746 fprintf_unfiltered (gdb_stdlog
,
3747 "infrun: stopped data address = %s\n",
3748 paddress (gdbarch
, addr
));
3750 fprintf_unfiltered (gdb_stdlog
,
3751 "infrun: (no data address available)\n");
3754 do_cleanups (old_chain
);
3757 if (stepping_past_singlestep_breakpoint
)
3759 gdb_assert (singlestep_breakpoints_inserted_p
);
3760 gdb_assert (ptid_equal (singlestep_ptid
, ecs
->ptid
));
3761 gdb_assert (!ptid_equal (singlestep_ptid
, saved_singlestep_ptid
));
3763 stepping_past_singlestep_breakpoint
= 0;
3765 /* We've either finished single-stepping past the single-step
3766 breakpoint, or stopped for some other reason. It would be nice if
3767 we could tell, but we can't reliably. */
3768 if (ecs
->event_thread
->suspend
.stop_signal
== GDB_SIGNAL_TRAP
)
3771 fprintf_unfiltered (gdb_stdlog
,
3772 "infrun: stepping_past_"
3773 "singlestep_breakpoint\n");
3774 /* Pull the single step breakpoints out of the target. */
3775 if (!ptid_equal (ecs
->ptid
, inferior_ptid
))
3776 context_switch (ecs
->ptid
);
3777 remove_single_step_breakpoints ();
3778 singlestep_breakpoints_inserted_p
= 0;
3780 ecs
->random_signal
= 0;
3781 ecs
->event_thread
->control
.trap_expected
= 0;
3783 context_switch (saved_singlestep_ptid
);
3784 if (deprecated_context_hook
)
3785 deprecated_context_hook (pid_to_thread_id (saved_singlestep_ptid
));
3787 resume (1, GDB_SIGNAL_0
);
3788 prepare_to_wait (ecs
);
3793 if (!ptid_equal (deferred_step_ptid
, null_ptid
))
3795 /* In non-stop mode, there's never a deferred_step_ptid set. */
3796 gdb_assert (!non_stop
);
3798 /* If we stopped for some other reason than single-stepping, ignore
3799 the fact that we were supposed to switch back. */
3800 if (ecs
->event_thread
->suspend
.stop_signal
== GDB_SIGNAL_TRAP
)
3803 fprintf_unfiltered (gdb_stdlog
,
3804 "infrun: handling deferred step\n");
3806 /* Pull the single step breakpoints out of the target. */
3807 if (singlestep_breakpoints_inserted_p
)
3809 if (!ptid_equal (ecs
->ptid
, inferior_ptid
))
3810 context_switch (ecs
->ptid
);
3811 remove_single_step_breakpoints ();
3812 singlestep_breakpoints_inserted_p
= 0;
3815 ecs
->event_thread
->control
.trap_expected
= 0;
3817 context_switch (deferred_step_ptid
);
3818 deferred_step_ptid
= null_ptid
;
3819 /* Suppress spurious "Switching to ..." message. */
3820 previous_inferior_ptid
= inferior_ptid
;
3822 resume (1, GDB_SIGNAL_0
);
3823 prepare_to_wait (ecs
);
3827 deferred_step_ptid
= null_ptid
;
3830 /* See if a thread hit a thread-specific breakpoint that was meant for
3831 another thread. If so, then step that thread past the breakpoint,
3834 if (ecs
->event_thread
->suspend
.stop_signal
== GDB_SIGNAL_TRAP
)
3836 int thread_hop_needed
= 0;
3837 struct address_space
*aspace
=
3838 get_regcache_aspace (get_thread_regcache (ecs
->ptid
));
3840 /* Check if a regular breakpoint has been hit before checking
3841 for a potential single step breakpoint. Otherwise, GDB will
3842 not see this breakpoint hit when stepping onto breakpoints. */
3843 if (regular_breakpoint_inserted_here_p (aspace
, stop_pc
))
3845 ecs
->random_signal
= 0;
3846 if (!breakpoint_thread_match (aspace
, stop_pc
, ecs
->ptid
))
3847 thread_hop_needed
= 1;
3849 else if (singlestep_breakpoints_inserted_p
)
3851 /* We have not context switched yet, so this should be true
3852 no matter which thread hit the singlestep breakpoint. */
3853 gdb_assert (ptid_equal (inferior_ptid
, singlestep_ptid
));
3855 fprintf_unfiltered (gdb_stdlog
, "infrun: software single step "
3857 target_pid_to_str (ecs
->ptid
));
3859 ecs
->random_signal
= 0;
3860 /* The call to in_thread_list is necessary because PTIDs sometimes
3861 change when we go from single-threaded to multi-threaded. If
3862 the singlestep_ptid is still in the list, assume that it is
3863 really different from ecs->ptid. */
3864 if (!ptid_equal (singlestep_ptid
, ecs
->ptid
)
3865 && in_thread_list (singlestep_ptid
))
3867 /* If the PC of the thread we were trying to single-step
3868 has changed, discard this event (which we were going
3869 to ignore anyway), and pretend we saw that thread
3870 trap. This prevents us continuously moving the
3871 single-step breakpoint forward, one instruction at a
3872 time. If the PC has changed, then the thread we were
3873 trying to single-step has trapped or been signalled,
3874 but the event has not been reported to GDB yet.
3876 There might be some cases where this loses signal
3877 information, if a signal has arrived at exactly the
3878 same time that the PC changed, but this is the best
3879 we can do with the information available. Perhaps we
3880 should arrange to report all events for all threads
3881 when they stop, or to re-poll the remote looking for
3882 this particular thread (i.e. temporarily enable
3885 CORE_ADDR new_singlestep_pc
3886 = regcache_read_pc (get_thread_regcache (singlestep_ptid
));
3888 if (new_singlestep_pc
!= singlestep_pc
)
3890 enum gdb_signal stop_signal
;
3893 fprintf_unfiltered (gdb_stdlog
, "infrun: unexpected thread,"
3894 " but expected thread advanced also\n");
3896 /* The current context still belongs to
3897 singlestep_ptid. Don't swap here, since that's
3898 the context we want to use. Just fudge our
3899 state and continue. */
3900 stop_signal
= ecs
->event_thread
->suspend
.stop_signal
;
3901 ecs
->event_thread
->suspend
.stop_signal
= GDB_SIGNAL_0
;
3902 ecs
->ptid
= singlestep_ptid
;
3903 ecs
->event_thread
= find_thread_ptid (ecs
->ptid
);
3904 ecs
->event_thread
->suspend
.stop_signal
= stop_signal
;
3905 stop_pc
= new_singlestep_pc
;
3910 fprintf_unfiltered (gdb_stdlog
,
3911 "infrun: unexpected thread\n");
3913 thread_hop_needed
= 1;
3914 stepping_past_singlestep_breakpoint
= 1;
3915 saved_singlestep_ptid
= singlestep_ptid
;
3920 if (thread_hop_needed
)
3922 struct regcache
*thread_regcache
;
3923 int remove_status
= 0;
3926 fprintf_unfiltered (gdb_stdlog
, "infrun: thread_hop_needed\n");
3928 /* Switch context before touching inferior memory, the
3929 previous thread may have exited. */
3930 if (!ptid_equal (inferior_ptid
, ecs
->ptid
))
3931 context_switch (ecs
->ptid
);
3933 /* Saw a breakpoint, but it was hit by the wrong thread.
3936 if (singlestep_breakpoints_inserted_p
)
3938 /* Pull the single step breakpoints out of the target. */
3939 remove_single_step_breakpoints ();
3940 singlestep_breakpoints_inserted_p
= 0;
3943 /* If the arch can displace step, don't remove the
3945 thread_regcache
= get_thread_regcache (ecs
->ptid
);
3946 if (!use_displaced_stepping (get_regcache_arch (thread_regcache
)))
3947 remove_status
= remove_breakpoints ();
3949 /* Did we fail to remove breakpoints? If so, try
3950 to set the PC past the bp. (There's at least
3951 one situation in which we can fail to remove
3952 the bp's: On HP-UX's that use ttrace, we can't
3953 change the address space of a vforking child
3954 process until the child exits (well, okay, not
3955 then either :-) or execs. */
3956 if (remove_status
!= 0)
3957 error (_("Cannot step over breakpoint hit in wrong thread"));
3962 /* Only need to require the next event from this
3963 thread in all-stop mode. */
3964 waiton_ptid
= ecs
->ptid
;
3965 infwait_state
= infwait_thread_hop_state
;
3968 ecs
->event_thread
->stepping_over_breakpoint
= 1;
3973 else if (singlestep_breakpoints_inserted_p
)
3975 ecs
->random_signal
= 0;
3979 ecs
->random_signal
= 1;
3981 /* See if something interesting happened to the non-current thread. If
3982 so, then switch to that thread. */
3983 if (!ptid_equal (ecs
->ptid
, inferior_ptid
))
3986 fprintf_unfiltered (gdb_stdlog
, "infrun: context switch\n");
3988 context_switch (ecs
->ptid
);
3990 if (deprecated_context_hook
)
3991 deprecated_context_hook (pid_to_thread_id (ecs
->ptid
));
3994 /* At this point, get hold of the now-current thread's frame. */
3995 frame
= get_current_frame ();
3996 gdbarch
= get_frame_arch (frame
);
3998 if (singlestep_breakpoints_inserted_p
)
4000 /* Pull the single step breakpoints out of the target. */
4001 remove_single_step_breakpoints ();
4002 singlestep_breakpoints_inserted_p
= 0;
4005 if (stepped_after_stopped_by_watchpoint
)
4006 stopped_by_watchpoint
= 0;
4008 stopped_by_watchpoint
= watchpoints_triggered (&ecs
->ws
);
4010 /* If necessary, step over this watchpoint. We'll be back to display
4012 if (stopped_by_watchpoint
4013 && (target_have_steppable_watchpoint
4014 || gdbarch_have_nonsteppable_watchpoint (gdbarch
)))
4016 /* At this point, we are stopped at an instruction which has
4017 attempted to write to a piece of memory under control of
4018 a watchpoint. The instruction hasn't actually executed
4019 yet. If we were to evaluate the watchpoint expression
4020 now, we would get the old value, and therefore no change
4021 would seem to have occurred.
4023 In order to make watchpoints work `right', we really need
4024 to complete the memory write, and then evaluate the
4025 watchpoint expression. We do this by single-stepping the
4028 It may not be necessary to disable the watchpoint to stop over
4029 it. For example, the PA can (with some kernel cooperation)
4030 single step over a watchpoint without disabling the watchpoint.
4032 It is far more common to need to disable a watchpoint to step
4033 the inferior over it. If we have non-steppable watchpoints,
4034 we must disable the current watchpoint; it's simplest to
4035 disable all watchpoints and breakpoints. */
4038 if (!target_have_steppable_watchpoint
)
4040 remove_breakpoints ();
4041 /* See comment in resume why we need to stop bypassing signals
4042 while breakpoints have been removed. */
4043 target_pass_signals (0, NULL
);
4046 hw_step
= maybe_software_singlestep (gdbarch
, stop_pc
);
4047 target_resume (ecs
->ptid
, hw_step
, GDB_SIGNAL_0
);
4048 waiton_ptid
= ecs
->ptid
;
4049 if (target_have_steppable_watchpoint
)
4050 infwait_state
= infwait_step_watch_state
;
4052 infwait_state
= infwait_nonstep_watch_state
;
4053 prepare_to_wait (ecs
);
4057 clear_stop_func (ecs
);
4058 ecs
->event_thread
->stepping_over_breakpoint
= 0;
4059 bpstat_clear (&ecs
->event_thread
->control
.stop_bpstat
);
4060 ecs
->event_thread
->control
.stop_step
= 0;
4061 stop_print_frame
= 1;
4062 ecs
->random_signal
= 0;
4063 stopped_by_random_signal
= 0;
4065 /* Hide inlined functions starting here, unless we just performed stepi or
4066 nexti. After stepi and nexti, always show the innermost frame (not any
4067 inline function call sites). */
4068 if (ecs
->event_thread
->control
.step_range_end
!= 1)
4070 struct address_space
*aspace
=
4071 get_regcache_aspace (get_thread_regcache (ecs
->ptid
));
4073 /* skip_inline_frames is expensive, so we avoid it if we can
4074 determine that the address is one where functions cannot have
4075 been inlined. This improves performance with inferiors that
4076 load a lot of shared libraries, because the solib event
4077 breakpoint is defined as the address of a function (i.e. not
4078 inline). Note that we have to check the previous PC as well
4079 as the current one to catch cases when we have just
4080 single-stepped off a breakpoint prior to reinstating it.
4081 Note that we're assuming that the code we single-step to is
4082 not inline, but that's not definitive: there's nothing
4083 preventing the event breakpoint function from containing
4084 inlined code, and the single-step ending up there. If the
4085 user had set a breakpoint on that inlined code, the missing
4086 skip_inline_frames call would break things. Fortunately
4087 that's an extremely unlikely scenario. */
4088 if (!pc_at_non_inline_function (aspace
, stop_pc
, &ecs
->ws
)
4089 && !(ecs
->event_thread
->suspend
.stop_signal
== GDB_SIGNAL_TRAP
4090 && ecs
->event_thread
->control
.trap_expected
4091 && pc_at_non_inline_function (aspace
,
4092 ecs
->event_thread
->prev_pc
,
4095 skip_inline_frames (ecs
->ptid
);
4097 /* Re-fetch current thread's frame in case that invalidated
4099 frame
= get_current_frame ();
4100 gdbarch
= get_frame_arch (frame
);
4104 if (ecs
->event_thread
->suspend
.stop_signal
== GDB_SIGNAL_TRAP
4105 && ecs
->event_thread
->control
.trap_expected
4106 && gdbarch_single_step_through_delay_p (gdbarch
)
4107 && currently_stepping (ecs
->event_thread
))
4109 /* We're trying to step off a breakpoint. Turns out that we're
4110 also on an instruction that needs to be stepped multiple
4111 times before it's been fully executing. E.g., architectures
4112 with a delay slot. It needs to be stepped twice, once for
4113 the instruction and once for the delay slot. */
4114 int step_through_delay
4115 = gdbarch_single_step_through_delay (gdbarch
, frame
);
4117 if (debug_infrun
&& step_through_delay
)
4118 fprintf_unfiltered (gdb_stdlog
, "infrun: step through delay\n");
4119 if (ecs
->event_thread
->control
.step_range_end
== 0
4120 && step_through_delay
)
4122 /* The user issued a continue when stopped at a breakpoint.
4123 Set up for another trap and get out of here. */
4124 ecs
->event_thread
->stepping_over_breakpoint
= 1;
4128 else if (step_through_delay
)
4130 /* The user issued a step when stopped at a breakpoint.
4131 Maybe we should stop, maybe we should not - the delay
4132 slot *might* correspond to a line of source. In any
4133 case, don't decide that here, just set
4134 ecs->stepping_over_breakpoint, making sure we
4135 single-step again before breakpoints are re-inserted. */
4136 ecs
->event_thread
->stepping_over_breakpoint
= 1;
4140 /* Look at the cause of the stop, and decide what to do.
4141 The alternatives are:
4142 1) stop_stepping and return; to really stop and return to the debugger,
4143 2) keep_going and return to start up again
4144 (set ecs->event_thread->stepping_over_breakpoint to 1 to single step once)
4145 3) set ecs->random_signal to 1, and the decision between 1 and 2
4146 will be made according to the signal handling tables. */
4148 if (ecs
->event_thread
->suspend
.stop_signal
== GDB_SIGNAL_TRAP
4152 fprintf_unfiltered (gdb_stdlog
, "infrun: stopped\n");
4153 stop_print_frame
= 0;
4154 stop_stepping (ecs
);
4158 /* This is originated from start_remote(), start_inferior() and
4159 shared libraries hook functions. */
4160 if (stop_soon
== STOP_QUIETLY
|| stop_soon
== STOP_QUIETLY_REMOTE
)
4163 fprintf_unfiltered (gdb_stdlog
, "infrun: quietly stopped\n");
4164 stop_stepping (ecs
);
4168 /* This originates from attach_command(). We need to overwrite
4169 the stop_signal here, because some kernels don't ignore a
4170 SIGSTOP in a subsequent ptrace(PTRACE_CONT,SIGSTOP) call.
4171 See more comments in inferior.h. On the other hand, if we
4172 get a non-SIGSTOP, report it to the user - assume the backend
4173 will handle the SIGSTOP if it should show up later.
4175 Also consider that the attach is complete when we see a
4176 SIGTRAP. Some systems (e.g. Windows), and stubs supporting
4177 target extended-remote report it instead of a SIGSTOP
4178 (e.g. gdbserver). We already rely on SIGTRAP being our
4179 signal, so this is no exception.
4181 Also consider that the attach is complete when we see a
4182 GDB_SIGNAL_0. In non-stop mode, GDB will explicitly tell
4183 the target to stop all threads of the inferior, in case the
4184 low level attach operation doesn't stop them implicitly. If
4185 they weren't stopped implicitly, then the stub will report a
4186 GDB_SIGNAL_0, meaning: stopped for no particular reason
4187 other than GDB's request. */
4188 if (stop_soon
== STOP_QUIETLY_NO_SIGSTOP
4189 && (ecs
->event_thread
->suspend
.stop_signal
== GDB_SIGNAL_STOP
4190 || ecs
->event_thread
->suspend
.stop_signal
== GDB_SIGNAL_TRAP
4191 || ecs
->event_thread
->suspend
.stop_signal
== GDB_SIGNAL_0
))
4193 stop_stepping (ecs
);
4194 ecs
->event_thread
->suspend
.stop_signal
= GDB_SIGNAL_0
;
4198 /* See if there is a breakpoint/watchpoint/catchpoint/etc. that
4199 handles this event. */
4200 ecs
->event_thread
->control
.stop_bpstat
4201 = bpstat_stop_status (get_regcache_aspace (get_current_regcache ()),
4202 stop_pc
, ecs
->ptid
, &ecs
->ws
);
4204 /* Following in case break condition called a
4206 stop_print_frame
= 1;
4208 /* This is where we handle "moribund" watchpoints. Unlike
4209 software breakpoints traps, hardware watchpoint traps are
4210 always distinguishable from random traps. If no high-level
4211 watchpoint is associated with the reported stop data address
4212 anymore, then the bpstat does not explain the signal ---
4213 simply make sure to ignore it if `stopped_by_watchpoint' is
4217 && ecs
->event_thread
->suspend
.stop_signal
== GDB_SIGNAL_TRAP
4218 && (bpstat_explains_signal (ecs
->event_thread
->control
.stop_bpstat
)
4219 == BPSTAT_SIGNAL_NO
)
4220 && stopped_by_watchpoint
)
4221 fprintf_unfiltered (gdb_stdlog
,
4222 "infrun: no user watchpoint explains "
4223 "watchpoint SIGTRAP, ignoring\n");
4225 /* NOTE: cagney/2003-03-29: These two checks for a random signal
4226 at one stage in the past included checks for an inferior
4227 function call's call dummy's return breakpoint. The original
4228 comment, that went with the test, read:
4230 ``End of a stack dummy. Some systems (e.g. Sony news) give
4231 another signal besides SIGTRAP, so check here as well as
4234 If someone ever tries to get call dummys on a
4235 non-executable stack to work (where the target would stop
4236 with something like a SIGSEGV), then those tests might need
4237 to be re-instated. Given, however, that the tests were only
4238 enabled when momentary breakpoints were not being used, I
4239 suspect that it won't be the case.
4241 NOTE: kettenis/2004-02-05: Indeed such checks don't seem to
4242 be necessary for call dummies on a non-executable stack on
4245 if (ecs
->event_thread
->suspend
.stop_signal
== GDB_SIGNAL_TRAP
)
4247 = !((bpstat_explains_signal (ecs
->event_thread
->control
.stop_bpstat
)
4248 != BPSTAT_SIGNAL_NO
)
4249 || stopped_by_watchpoint
4250 || ecs
->event_thread
->control
.trap_expected
4251 || (ecs
->event_thread
->control
.step_range_end
4252 && (ecs
->event_thread
->control
.step_resume_breakpoint
4256 enum bpstat_signal_value sval
;
4258 sval
= bpstat_explains_signal (ecs
->event_thread
->control
.stop_bpstat
);
4259 ecs
->random_signal
= (sval
== BPSTAT_SIGNAL_NO
);
4261 if (sval
== BPSTAT_SIGNAL_HIDE
)
4262 ecs
->event_thread
->suspend
.stop_signal
= GDB_SIGNAL_TRAP
;
4265 process_event_stop_test
:
4267 /* Re-fetch current thread's frame in case we did a
4268 "goto process_event_stop_test" above. */
4269 frame
= get_current_frame ();
4270 gdbarch
= get_frame_arch (frame
);
4272 /* For the program's own signals, act according to
4273 the signal handling tables. */
4275 if (ecs
->random_signal
)
4277 /* Signal not for debugging purposes. */
4279 struct inferior
*inf
= find_inferior_pid (ptid_get_pid (ecs
->ptid
));
4282 fprintf_unfiltered (gdb_stdlog
, "infrun: random signal %d\n",
4283 ecs
->event_thread
->suspend
.stop_signal
);
4285 stopped_by_random_signal
= 1;
4287 if (signal_print
[ecs
->event_thread
->suspend
.stop_signal
])
4290 target_terminal_ours_for_output ();
4291 print_signal_received_reason
4292 (ecs
->event_thread
->suspend
.stop_signal
);
4294 /* Always stop on signals if we're either just gaining control
4295 of the program, or the user explicitly requested this thread
4296 to remain stopped. */
4297 if (stop_soon
!= NO_STOP_QUIETLY
4298 || ecs
->event_thread
->stop_requested
4300 && signal_stop_state (ecs
->event_thread
->suspend
.stop_signal
)))
4302 stop_stepping (ecs
);
4305 /* If not going to stop, give terminal back
4306 if we took it away. */
4308 target_terminal_inferior ();
4310 /* Clear the signal if it should not be passed. */
4311 if (signal_program
[ecs
->event_thread
->suspend
.stop_signal
] == 0)
4312 ecs
->event_thread
->suspend
.stop_signal
= GDB_SIGNAL_0
;
4314 if (ecs
->event_thread
->prev_pc
== stop_pc
4315 && ecs
->event_thread
->control
.trap_expected
4316 && ecs
->event_thread
->control
.step_resume_breakpoint
== NULL
)
4318 /* We were just starting a new sequence, attempting to
4319 single-step off of a breakpoint and expecting a SIGTRAP.
4320 Instead this signal arrives. This signal will take us out
4321 of the stepping range so GDB needs to remember to, when
4322 the signal handler returns, resume stepping off that
4324 /* To simplify things, "continue" is forced to use the same
4325 code paths as single-step - set a breakpoint at the
4326 signal return address and then, once hit, step off that
4329 fprintf_unfiltered (gdb_stdlog
,
4330 "infrun: signal arrived while stepping over "
4333 insert_hp_step_resume_breakpoint_at_frame (frame
);
4334 ecs
->event_thread
->step_after_step_resume_breakpoint
= 1;
4335 /* Reset trap_expected to ensure breakpoints are re-inserted. */
4336 ecs
->event_thread
->control
.trap_expected
= 0;
4341 if (ecs
->event_thread
->control
.step_range_end
!= 0
4342 && ecs
->event_thread
->suspend
.stop_signal
!= GDB_SIGNAL_0
4343 && (ecs
->event_thread
->control
.step_range_start
<= stop_pc
4344 && stop_pc
< ecs
->event_thread
->control
.step_range_end
)
4345 && frame_id_eq (get_stack_frame_id (frame
),
4346 ecs
->event_thread
->control
.step_stack_frame_id
)
4347 && ecs
->event_thread
->control
.step_resume_breakpoint
== NULL
)
4349 /* The inferior is about to take a signal that will take it
4350 out of the single step range. Set a breakpoint at the
4351 current PC (which is presumably where the signal handler
4352 will eventually return) and then allow the inferior to
4355 Note that this is only needed for a signal delivered
4356 while in the single-step range. Nested signals aren't a
4357 problem as they eventually all return. */
4359 fprintf_unfiltered (gdb_stdlog
,
4360 "infrun: signal may take us out of "
4361 "single-step range\n");
4363 insert_hp_step_resume_breakpoint_at_frame (frame
);
4364 /* Reset trap_expected to ensure breakpoints are re-inserted. */
4365 ecs
->event_thread
->control
.trap_expected
= 0;
4370 /* Note: step_resume_breakpoint may be non-NULL. This occures
4371 when either there's a nested signal, or when there's a
4372 pending signal enabled just as the signal handler returns
4373 (leaving the inferior at the step-resume-breakpoint without
4374 actually executing it). Either way continue until the
4375 breakpoint is really hit. */
4379 /* Handle cases caused by hitting a breakpoint. */
4381 CORE_ADDR jmp_buf_pc
;
4382 struct bpstat_what what
;
4384 what
= bpstat_what (ecs
->event_thread
->control
.stop_bpstat
);
4386 if (what
.call_dummy
)
4388 stop_stack_dummy
= what
.call_dummy
;
4391 /* If we hit an internal event that triggers symbol changes, the
4392 current frame will be invalidated within bpstat_what (e.g.,
4393 if we hit an internal solib event). Re-fetch it. */
4394 frame
= get_current_frame ();
4395 gdbarch
= get_frame_arch (frame
);
4397 switch (what
.main_action
)
4399 case BPSTAT_WHAT_SET_LONGJMP_RESUME
:
4400 /* If we hit the breakpoint at longjmp while stepping, we
4401 install a momentary breakpoint at the target of the
4405 fprintf_unfiltered (gdb_stdlog
,
4406 "infrun: BPSTAT_WHAT_SET_LONGJMP_RESUME\n");
4408 ecs
->event_thread
->stepping_over_breakpoint
= 1;
4410 if (what
.is_longjmp
)
4412 struct value
*arg_value
;
4414 /* If we set the longjmp breakpoint via a SystemTap
4415 probe, then use it to extract the arguments. The
4416 destination PC is the third argument to the
4418 arg_value
= probe_safe_evaluate_at_pc (frame
, 2);
4420 jmp_buf_pc
= value_as_address (arg_value
);
4421 else if (!gdbarch_get_longjmp_target_p (gdbarch
)
4422 || !gdbarch_get_longjmp_target (gdbarch
,
4423 frame
, &jmp_buf_pc
))
4426 fprintf_unfiltered (gdb_stdlog
,
4427 "infrun: BPSTAT_WHAT_SET_LONGJMP_RESUME "
4428 "(!gdbarch_get_longjmp_target)\n");
4433 /* Insert a breakpoint at resume address. */
4434 insert_longjmp_resume_breakpoint (gdbarch
, jmp_buf_pc
);
4437 check_exception_resume (ecs
, frame
);
4441 case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME
:
4443 struct frame_info
*init_frame
;
4445 /* There are several cases to consider.
4447 1. The initiating frame no longer exists. In this case
4448 we must stop, because the exception or longjmp has gone
4451 2. The initiating frame exists, and is the same as the
4452 current frame. We stop, because the exception or
4453 longjmp has been caught.
4455 3. The initiating frame exists and is different from
4456 the current frame. This means the exception or longjmp
4457 has been caught beneath the initiating frame, so keep
4460 4. longjmp breakpoint has been placed just to protect
4461 against stale dummy frames and user is not interested
4462 in stopping around longjmps. */
4465 fprintf_unfiltered (gdb_stdlog
,
4466 "infrun: BPSTAT_WHAT_CLEAR_LONGJMP_RESUME\n");
4468 gdb_assert (ecs
->event_thread
->control
.exception_resume_breakpoint
4470 delete_exception_resume_breakpoint (ecs
->event_thread
);
4472 if (what
.is_longjmp
)
4474 check_longjmp_breakpoint_for_call_dummy (ecs
->event_thread
->num
);
4476 if (!frame_id_p (ecs
->event_thread
->initiating_frame
))
4484 init_frame
= frame_find_by_id (ecs
->event_thread
->initiating_frame
);
4488 struct frame_id current_id
4489 = get_frame_id (get_current_frame ());
4490 if (frame_id_eq (current_id
,
4491 ecs
->event_thread
->initiating_frame
))
4493 /* Case 2. Fall through. */
4503 /* For Cases 1 and 2, remove the step-resume breakpoint,
4505 delete_step_resume_breakpoint (ecs
->event_thread
);
4507 ecs
->event_thread
->control
.stop_step
= 1;
4508 print_end_stepping_range_reason ();
4509 stop_stepping (ecs
);
4513 case BPSTAT_WHAT_SINGLE
:
4515 fprintf_unfiltered (gdb_stdlog
, "infrun: BPSTAT_WHAT_SINGLE\n");
4516 ecs
->event_thread
->stepping_over_breakpoint
= 1;
4517 /* Still need to check other stuff, at least the case where
4518 we are stepping and step out of the right range. */
4521 case BPSTAT_WHAT_STEP_RESUME
:
4523 fprintf_unfiltered (gdb_stdlog
, "infrun: BPSTAT_WHAT_STEP_RESUME\n");
4525 delete_step_resume_breakpoint (ecs
->event_thread
);
4526 if (ecs
->event_thread
->control
.proceed_to_finish
4527 && execution_direction
== EXEC_REVERSE
)
4529 struct thread_info
*tp
= ecs
->event_thread
;
4531 /* We are finishing a function in reverse, and just hit
4532 the step-resume breakpoint at the start address of
4533 the function, and we're almost there -- just need to
4534 back up by one more single-step, which should take us
4535 back to the function call. */
4536 tp
->control
.step_range_start
= tp
->control
.step_range_end
= 1;
4540 fill_in_stop_func (gdbarch
, ecs
);
4541 if (stop_pc
== ecs
->stop_func_start
4542 && execution_direction
== EXEC_REVERSE
)
4544 /* We are stepping over a function call in reverse, and
4545 just hit the step-resume breakpoint at the start
4546 address of the function. Go back to single-stepping,
4547 which should take us back to the function call. */
4548 ecs
->event_thread
->stepping_over_breakpoint
= 1;
4554 case BPSTAT_WHAT_STOP_NOISY
:
4556 fprintf_unfiltered (gdb_stdlog
, "infrun: BPSTAT_WHAT_STOP_NOISY\n");
4557 stop_print_frame
= 1;
4559 /* We are about to nuke the step_resume_breakpointt via the
4560 cleanup chain, so no need to worry about it here. */
4562 stop_stepping (ecs
);
4565 case BPSTAT_WHAT_STOP_SILENT
:
4567 fprintf_unfiltered (gdb_stdlog
, "infrun: BPSTAT_WHAT_STOP_SILENT\n");
4568 stop_print_frame
= 0;
4570 /* We are about to nuke the step_resume_breakpoin via the
4571 cleanup chain, so no need to worry about it here. */
4573 stop_stepping (ecs
);
4576 case BPSTAT_WHAT_HP_STEP_RESUME
:
4578 fprintf_unfiltered (gdb_stdlog
, "infrun: BPSTAT_WHAT_HP_STEP_RESUME\n");
4580 delete_step_resume_breakpoint (ecs
->event_thread
);
4581 if (ecs
->event_thread
->step_after_step_resume_breakpoint
)
4583 /* Back when the step-resume breakpoint was inserted, we
4584 were trying to single-step off a breakpoint. Go back
4586 ecs
->event_thread
->step_after_step_resume_breakpoint
= 0;
4587 ecs
->event_thread
->stepping_over_breakpoint
= 1;
4593 case BPSTAT_WHAT_KEEP_CHECKING
:
4598 /* We come here if we hit a breakpoint but should not
4599 stop for it. Possibly we also were stepping
4600 and should stop for that. So fall through and
4601 test for stepping. But, if not stepping,
4604 /* In all-stop mode, if we're currently stepping but have stopped in
4605 some other thread, we need to switch back to the stepped thread. */
4608 struct thread_info
*tp
;
4610 tp
= iterate_over_threads (currently_stepping_or_nexting_callback
,
4614 /* However, if the current thread is blocked on some internal
4615 breakpoint, and we simply need to step over that breakpoint
4616 to get it going again, do that first. */
4617 if ((ecs
->event_thread
->control
.trap_expected
4618 && ecs
->event_thread
->suspend
.stop_signal
!= GDB_SIGNAL_TRAP
)
4619 || ecs
->event_thread
->stepping_over_breakpoint
)
4625 /* If the stepping thread exited, then don't try to switch
4626 back and resume it, which could fail in several different
4627 ways depending on the target. Instead, just keep going.
4629 We can find a stepping dead thread in the thread list in
4632 - The target supports thread exit events, and when the
4633 target tries to delete the thread from the thread list,
4634 inferior_ptid pointed at the exiting thread. In such
4635 case, calling delete_thread does not really remove the
4636 thread from the list; instead, the thread is left listed,
4637 with 'exited' state.
4639 - The target's debug interface does not support thread
4640 exit events, and so we have no idea whatsoever if the
4641 previously stepping thread is still alive. For that
4642 reason, we need to synchronously query the target
4644 if (is_exited (tp
->ptid
)
4645 || !target_thread_alive (tp
->ptid
))
4648 fprintf_unfiltered (gdb_stdlog
,
4649 "infrun: not switching back to "
4650 "stepped thread, it has vanished\n");
4652 delete_thread (tp
->ptid
);
4657 /* Otherwise, we no longer expect a trap in the current thread.
4658 Clear the trap_expected flag before switching back -- this is
4659 what keep_going would do as well, if we called it. */
4660 ecs
->event_thread
->control
.trap_expected
= 0;
4663 fprintf_unfiltered (gdb_stdlog
,
4664 "infrun: switching back to stepped thread\n");
4666 ecs
->event_thread
= tp
;
4667 ecs
->ptid
= tp
->ptid
;
4668 context_switch (ecs
->ptid
);
4674 if (ecs
->event_thread
->control
.step_resume_breakpoint
)
4677 fprintf_unfiltered (gdb_stdlog
,
4678 "infrun: step-resume breakpoint is inserted\n");
4680 /* Having a step-resume breakpoint overrides anything
4681 else having to do with stepping commands until
4682 that breakpoint is reached. */
4687 if (ecs
->event_thread
->control
.step_range_end
== 0)
4690 fprintf_unfiltered (gdb_stdlog
, "infrun: no stepping, continue\n");
4691 /* Likewise if we aren't even stepping. */
4696 /* Re-fetch current thread's frame in case the code above caused
4697 the frame cache to be re-initialized, making our FRAME variable
4698 a dangling pointer. */
4699 frame
= get_current_frame ();
4700 gdbarch
= get_frame_arch (frame
);
4701 fill_in_stop_func (gdbarch
, ecs
);
4703 /* If stepping through a line, keep going if still within it.
4705 Note that step_range_end is the address of the first instruction
4706 beyond the step range, and NOT the address of the last instruction
4709 Note also that during reverse execution, we may be stepping
4710 through a function epilogue and therefore must detect when
4711 the current-frame changes in the middle of a line. */
4713 if (stop_pc
>= ecs
->event_thread
->control
.step_range_start
4714 && stop_pc
< ecs
->event_thread
->control
.step_range_end
4715 && (execution_direction
!= EXEC_REVERSE
4716 || frame_id_eq (get_frame_id (frame
),
4717 ecs
->event_thread
->control
.step_frame_id
)))
4721 (gdb_stdlog
, "infrun: stepping inside range [%s-%s]\n",
4722 paddress (gdbarch
, ecs
->event_thread
->control
.step_range_start
),
4723 paddress (gdbarch
, ecs
->event_thread
->control
.step_range_end
));
4725 /* When stepping backward, stop at beginning of line range
4726 (unless it's the function entry point, in which case
4727 keep going back to the call point). */
4728 if (stop_pc
== ecs
->event_thread
->control
.step_range_start
4729 && stop_pc
!= ecs
->stop_func_start
4730 && execution_direction
== EXEC_REVERSE
)
4732 ecs
->event_thread
->control
.stop_step
= 1;
4733 print_end_stepping_range_reason ();
4734 stop_stepping (ecs
);
4742 /* We stepped out of the stepping range. */
4744 /* If we are stepping at the source level and entered the runtime
4745 loader dynamic symbol resolution code...
4747 EXEC_FORWARD: we keep on single stepping until we exit the run
4748 time loader code and reach the callee's address.
4750 EXEC_REVERSE: we've already executed the callee (backward), and
4751 the runtime loader code is handled just like any other
4752 undebuggable function call. Now we need only keep stepping
4753 backward through the trampoline code, and that's handled further
4754 down, so there is nothing for us to do here. */
4756 if (execution_direction
!= EXEC_REVERSE
4757 && ecs
->event_thread
->control
.step_over_calls
== STEP_OVER_UNDEBUGGABLE
4758 && in_solib_dynsym_resolve_code (stop_pc
))
4760 CORE_ADDR pc_after_resolver
=
4761 gdbarch_skip_solib_resolver (gdbarch
, stop_pc
);
4764 fprintf_unfiltered (gdb_stdlog
,
4765 "infrun: stepped into dynsym resolve code\n");
4767 if (pc_after_resolver
)
4769 /* Set up a step-resume breakpoint at the address
4770 indicated by SKIP_SOLIB_RESOLVER. */
4771 struct symtab_and_line sr_sal
;
4774 sr_sal
.pc
= pc_after_resolver
;
4775 sr_sal
.pspace
= get_frame_program_space (frame
);
4777 insert_step_resume_breakpoint_at_sal (gdbarch
,
4778 sr_sal
, null_frame_id
);
4785 if (ecs
->event_thread
->control
.step_range_end
!= 1
4786 && (ecs
->event_thread
->control
.step_over_calls
== STEP_OVER_UNDEBUGGABLE
4787 || ecs
->event_thread
->control
.step_over_calls
== STEP_OVER_ALL
)
4788 && get_frame_type (frame
) == SIGTRAMP_FRAME
)
4791 fprintf_unfiltered (gdb_stdlog
,
4792 "infrun: stepped into signal trampoline\n");
4793 /* The inferior, while doing a "step" or "next", has ended up in
4794 a signal trampoline (either by a signal being delivered or by
4795 the signal handler returning). Just single-step until the
4796 inferior leaves the trampoline (either by calling the handler
4802 /* If we're in the return path from a shared library trampoline,
4803 we want to proceed through the trampoline when stepping. */
4804 /* macro/2012-04-25: This needs to come before the subroutine
4805 call check below as on some targets return trampolines look
4806 like subroutine calls (MIPS16 return thunks). */
4807 if (gdbarch_in_solib_return_trampoline (gdbarch
,
4808 stop_pc
, ecs
->stop_func_name
)
4809 && ecs
->event_thread
->control
.step_over_calls
!= STEP_OVER_NONE
)
4811 /* Determine where this trampoline returns. */
4812 CORE_ADDR real_stop_pc
;
4814 real_stop_pc
= gdbarch_skip_trampoline_code (gdbarch
, frame
, stop_pc
);
4817 fprintf_unfiltered (gdb_stdlog
,
4818 "infrun: stepped into solib return tramp\n");
4820 /* Only proceed through if we know where it's going. */
4823 /* And put the step-breakpoint there and go until there. */
4824 struct symtab_and_line sr_sal
;
4826 init_sal (&sr_sal
); /* initialize to zeroes */
4827 sr_sal
.pc
= real_stop_pc
;
4828 sr_sal
.section
= find_pc_overlay (sr_sal
.pc
);
4829 sr_sal
.pspace
= get_frame_program_space (frame
);
4831 /* Do not specify what the fp should be when we stop since
4832 on some machines the prologue is where the new fp value
4834 insert_step_resume_breakpoint_at_sal (gdbarch
,
4835 sr_sal
, null_frame_id
);
4837 /* Restart without fiddling with the step ranges or
4844 /* Check for subroutine calls. The check for the current frame
4845 equalling the step ID is not necessary - the check of the
4846 previous frame's ID is sufficient - but it is a common case and
4847 cheaper than checking the previous frame's ID.
4849 NOTE: frame_id_eq will never report two invalid frame IDs as
4850 being equal, so to get into this block, both the current and
4851 previous frame must have valid frame IDs. */
4852 /* The outer_frame_id check is a heuristic to detect stepping
4853 through startup code. If we step over an instruction which
4854 sets the stack pointer from an invalid value to a valid value,
4855 we may detect that as a subroutine call from the mythical
4856 "outermost" function. This could be fixed by marking
4857 outermost frames as !stack_p,code_p,special_p. Then the
4858 initial outermost frame, before sp was valid, would
4859 have code_addr == &_start. See the comment in frame_id_eq
4861 if (!frame_id_eq (get_stack_frame_id (frame
),
4862 ecs
->event_thread
->control
.step_stack_frame_id
)
4863 && (frame_id_eq (frame_unwind_caller_id (get_current_frame ()),
4864 ecs
->event_thread
->control
.step_stack_frame_id
)
4865 && (!frame_id_eq (ecs
->event_thread
->control
.step_stack_frame_id
,
4867 || step_start_function
!= find_pc_function (stop_pc
))))
4869 CORE_ADDR real_stop_pc
;
4872 fprintf_unfiltered (gdb_stdlog
, "infrun: stepped into subroutine\n");
4874 if ((ecs
->event_thread
->control
.step_over_calls
== STEP_OVER_NONE
)
4875 || ((ecs
->event_thread
->control
.step_range_end
== 1)
4876 && in_prologue (gdbarch
, ecs
->event_thread
->prev_pc
,
4877 ecs
->stop_func_start
)))
4879 /* I presume that step_over_calls is only 0 when we're
4880 supposed to be stepping at the assembly language level
4881 ("stepi"). Just stop. */
4882 /* Also, maybe we just did a "nexti" inside a prolog, so we
4883 thought it was a subroutine call but it was not. Stop as
4885 /* And this works the same backward as frontward. MVS */
4886 ecs
->event_thread
->control
.stop_step
= 1;
4887 print_end_stepping_range_reason ();
4888 stop_stepping (ecs
);
4892 /* Reverse stepping through solib trampolines. */
4894 if (execution_direction
== EXEC_REVERSE
4895 && ecs
->event_thread
->control
.step_over_calls
!= STEP_OVER_NONE
4896 && (gdbarch_skip_trampoline_code (gdbarch
, frame
, stop_pc
)
4897 || (ecs
->stop_func_start
== 0
4898 && in_solib_dynsym_resolve_code (stop_pc
))))
4900 /* Any solib trampoline code can be handled in reverse
4901 by simply continuing to single-step. We have already
4902 executed the solib function (backwards), and a few
4903 steps will take us back through the trampoline to the
4909 if (ecs
->event_thread
->control
.step_over_calls
== STEP_OVER_ALL
)
4911 /* We're doing a "next".
4913 Normal (forward) execution: set a breakpoint at the
4914 callee's return address (the address at which the caller
4917 Reverse (backward) execution. set the step-resume
4918 breakpoint at the start of the function that we just
4919 stepped into (backwards), and continue to there. When we
4920 get there, we'll need to single-step back to the caller. */
4922 if (execution_direction
== EXEC_REVERSE
)
4924 /* If we're already at the start of the function, we've either
4925 just stepped backward into a single instruction function,
4926 or stepped back out of a signal handler to the first instruction
4927 of the function. Just keep going, which will single-step back
4929 if (ecs
->stop_func_start
!= stop_pc
)
4931 struct symtab_and_line sr_sal
;
4933 /* Normal function call return (static or dynamic). */
4935 sr_sal
.pc
= ecs
->stop_func_start
;
4936 sr_sal
.pspace
= get_frame_program_space (frame
);
4937 insert_step_resume_breakpoint_at_sal (gdbarch
,
4938 sr_sal
, null_frame_id
);
4942 insert_step_resume_breakpoint_at_caller (frame
);
4948 /* If we are in a function call trampoline (a stub between the
4949 calling routine and the real function), locate the real
4950 function. That's what tells us (a) whether we want to step
4951 into it at all, and (b) what prologue we want to run to the
4952 end of, if we do step into it. */
4953 real_stop_pc
= skip_language_trampoline (frame
, stop_pc
);
4954 if (real_stop_pc
== 0)
4955 real_stop_pc
= gdbarch_skip_trampoline_code (gdbarch
, frame
, stop_pc
);
4956 if (real_stop_pc
!= 0)
4957 ecs
->stop_func_start
= real_stop_pc
;
4959 if (real_stop_pc
!= 0 && in_solib_dynsym_resolve_code (real_stop_pc
))
4961 struct symtab_and_line sr_sal
;
4964 sr_sal
.pc
= ecs
->stop_func_start
;
4965 sr_sal
.pspace
= get_frame_program_space (frame
);
4967 insert_step_resume_breakpoint_at_sal (gdbarch
,
4968 sr_sal
, null_frame_id
);
4973 /* If we have line number information for the function we are
4974 thinking of stepping into and the function isn't on the skip
4977 If there are several symtabs at that PC (e.g. with include
4978 files), just want to know whether *any* of them have line
4979 numbers. find_pc_line handles this. */
4981 struct symtab_and_line tmp_sal
;
4983 tmp_sal
= find_pc_line (ecs
->stop_func_start
, 0);
4984 if (tmp_sal
.line
!= 0
4985 && !function_name_is_marked_for_skip (ecs
->stop_func_name
,
4988 if (execution_direction
== EXEC_REVERSE
)
4989 handle_step_into_function_backward (gdbarch
, ecs
);
4991 handle_step_into_function (gdbarch
, ecs
);
4996 /* If we have no line number and the step-stop-if-no-debug is
4997 set, we stop the step so that the user has a chance to switch
4998 in assembly mode. */
4999 if (ecs
->event_thread
->control
.step_over_calls
== STEP_OVER_UNDEBUGGABLE
5000 && step_stop_if_no_debug
)
5002 ecs
->event_thread
->control
.stop_step
= 1;
5003 print_end_stepping_range_reason ();
5004 stop_stepping (ecs
);
5008 if (execution_direction
== EXEC_REVERSE
)
5010 /* If we're already at the start of the function, we've either just
5011 stepped backward into a single instruction function without line
5012 number info, or stepped back out of a signal handler to the first
5013 instruction of the function without line number info. Just keep
5014 going, which will single-step back to the caller. */
5015 if (ecs
->stop_func_start
!= stop_pc
)
5017 /* Set a breakpoint at callee's start address.
5018 From there we can step once and be back in the caller. */
5019 struct symtab_and_line sr_sal
;
5022 sr_sal
.pc
= ecs
->stop_func_start
;
5023 sr_sal
.pspace
= get_frame_program_space (frame
);
5024 insert_step_resume_breakpoint_at_sal (gdbarch
,
5025 sr_sal
, null_frame_id
);
5029 /* Set a breakpoint at callee's return address (the address
5030 at which the caller will resume). */
5031 insert_step_resume_breakpoint_at_caller (frame
);
5037 /* Reverse stepping through solib trampolines. */
5039 if (execution_direction
== EXEC_REVERSE
5040 && ecs
->event_thread
->control
.step_over_calls
!= STEP_OVER_NONE
)
5042 if (gdbarch_skip_trampoline_code (gdbarch
, frame
, stop_pc
)
5043 || (ecs
->stop_func_start
== 0
5044 && in_solib_dynsym_resolve_code (stop_pc
)))
5046 /* Any solib trampoline code can be handled in reverse
5047 by simply continuing to single-step. We have already
5048 executed the solib function (backwards), and a few
5049 steps will take us back through the trampoline to the
5054 else if (in_solib_dynsym_resolve_code (stop_pc
))
5056 /* Stepped backward into the solib dynsym resolver.
5057 Set a breakpoint at its start and continue, then
5058 one more step will take us out. */
5059 struct symtab_and_line sr_sal
;
5062 sr_sal
.pc
= ecs
->stop_func_start
;
5063 sr_sal
.pspace
= get_frame_program_space (frame
);
5064 insert_step_resume_breakpoint_at_sal (gdbarch
,
5065 sr_sal
, null_frame_id
);
5071 stop_pc_sal
= find_pc_line (stop_pc
, 0);
5073 /* NOTE: tausq/2004-05-24: This if block used to be done before all
5074 the trampoline processing logic, however, there are some trampolines
5075 that have no names, so we should do trampoline handling first. */
5076 if (ecs
->event_thread
->control
.step_over_calls
== STEP_OVER_UNDEBUGGABLE
5077 && ecs
->stop_func_name
== NULL
5078 && stop_pc_sal
.line
== 0)
5081 fprintf_unfiltered (gdb_stdlog
,
5082 "infrun: stepped into undebuggable function\n");
5084 /* The inferior just stepped into, or returned to, an
5085 undebuggable function (where there is no debugging information
5086 and no line number corresponding to the address where the
5087 inferior stopped). Since we want to skip this kind of code,
5088 we keep going until the inferior returns from this
5089 function - unless the user has asked us not to (via
5090 set step-mode) or we no longer know how to get back
5091 to the call site. */
5092 if (step_stop_if_no_debug
5093 || !frame_id_p (frame_unwind_caller_id (frame
)))
5095 /* If we have no line number and the step-stop-if-no-debug
5096 is set, we stop the step so that the user has a chance to
5097 switch in assembly mode. */
5098 ecs
->event_thread
->control
.stop_step
= 1;
5099 print_end_stepping_range_reason ();
5100 stop_stepping (ecs
);
5105 /* Set a breakpoint at callee's return address (the address
5106 at which the caller will resume). */
5107 insert_step_resume_breakpoint_at_caller (frame
);
5113 if (ecs
->event_thread
->control
.step_range_end
== 1)
5115 /* It is stepi or nexti. We always want to stop stepping after
5118 fprintf_unfiltered (gdb_stdlog
, "infrun: stepi/nexti\n");
5119 ecs
->event_thread
->control
.stop_step
= 1;
5120 print_end_stepping_range_reason ();
5121 stop_stepping (ecs
);
5125 if (stop_pc_sal
.line
== 0)
5127 /* We have no line number information. That means to stop
5128 stepping (does this always happen right after one instruction,
5129 when we do "s" in a function with no line numbers,
5130 or can this happen as a result of a return or longjmp?). */
5132 fprintf_unfiltered (gdb_stdlog
, "infrun: no line number info\n");
5133 ecs
->event_thread
->control
.stop_step
= 1;
5134 print_end_stepping_range_reason ();
5135 stop_stepping (ecs
);
5139 /* Look for "calls" to inlined functions, part one. If the inline
5140 frame machinery detected some skipped call sites, we have entered
5141 a new inline function. */
5143 if (frame_id_eq (get_frame_id (get_current_frame ()),
5144 ecs
->event_thread
->control
.step_frame_id
)
5145 && inline_skipped_frames (ecs
->ptid
))
5147 struct symtab_and_line call_sal
;
5150 fprintf_unfiltered (gdb_stdlog
,
5151 "infrun: stepped into inlined function\n");
5153 find_frame_sal (get_current_frame (), &call_sal
);
5155 if (ecs
->event_thread
->control
.step_over_calls
!= STEP_OVER_ALL
)
5157 /* For "step", we're going to stop. But if the call site
5158 for this inlined function is on the same source line as
5159 we were previously stepping, go down into the function
5160 first. Otherwise stop at the call site. */
5162 if (call_sal
.line
== ecs
->event_thread
->current_line
5163 && call_sal
.symtab
== ecs
->event_thread
->current_symtab
)
5164 step_into_inline_frame (ecs
->ptid
);
5166 ecs
->event_thread
->control
.stop_step
= 1;
5167 print_end_stepping_range_reason ();
5168 stop_stepping (ecs
);
5173 /* For "next", we should stop at the call site if it is on a
5174 different source line. Otherwise continue through the
5175 inlined function. */
5176 if (call_sal
.line
== ecs
->event_thread
->current_line
5177 && call_sal
.symtab
== ecs
->event_thread
->current_symtab
)
5181 ecs
->event_thread
->control
.stop_step
= 1;
5182 print_end_stepping_range_reason ();
5183 stop_stepping (ecs
);
5189 /* Look for "calls" to inlined functions, part two. If we are still
5190 in the same real function we were stepping through, but we have
5191 to go further up to find the exact frame ID, we are stepping
5192 through a more inlined call beyond its call site. */
5194 if (get_frame_type (get_current_frame ()) == INLINE_FRAME
5195 && !frame_id_eq (get_frame_id (get_current_frame ()),
5196 ecs
->event_thread
->control
.step_frame_id
)
5197 && stepped_in_from (get_current_frame (),
5198 ecs
->event_thread
->control
.step_frame_id
))
5201 fprintf_unfiltered (gdb_stdlog
,
5202 "infrun: stepping through inlined function\n");
5204 if (ecs
->event_thread
->control
.step_over_calls
== STEP_OVER_ALL
)
5208 ecs
->event_thread
->control
.stop_step
= 1;
5209 print_end_stepping_range_reason ();
5210 stop_stepping (ecs
);
5215 if ((stop_pc
== stop_pc_sal
.pc
)
5216 && (ecs
->event_thread
->current_line
!= stop_pc_sal
.line
5217 || ecs
->event_thread
->current_symtab
!= stop_pc_sal
.symtab
))
5219 /* We are at the start of a different line. So stop. Note that
5220 we don't stop if we step into the middle of a different line.
5221 That is said to make things like for (;;) statements work
5224 fprintf_unfiltered (gdb_stdlog
,
5225 "infrun: stepped to a different line\n");
5226 ecs
->event_thread
->control
.stop_step
= 1;
5227 print_end_stepping_range_reason ();
5228 stop_stepping (ecs
);
5232 /* We aren't done stepping.
5234 Optimize by setting the stepping range to the line.
5235 (We might not be in the original line, but if we entered a
5236 new line in mid-statement, we continue stepping. This makes
5237 things like for(;;) statements work better.) */
5239 ecs
->event_thread
->control
.step_range_start
= stop_pc_sal
.pc
;
5240 ecs
->event_thread
->control
.step_range_end
= stop_pc_sal
.end
;
5241 set_step_info (frame
, stop_pc_sal
);
5244 fprintf_unfiltered (gdb_stdlog
, "infrun: keep going\n");
5248 /* Is thread TP in the middle of single-stepping? */
5251 currently_stepping (struct thread_info
*tp
)
5253 return ((tp
->control
.step_range_end
5254 && tp
->control
.step_resume_breakpoint
== NULL
)
5255 || tp
->control
.trap_expected
5256 || bpstat_should_step ());
5259 /* Returns true if any thread *but* the one passed in "data" is in the
5260 middle of stepping or of handling a "next". */
5263 currently_stepping_or_nexting_callback (struct thread_info
*tp
, void *data
)
5268 return (tp
->control
.step_range_end
5269 || tp
->control
.trap_expected
);
5272 /* Inferior has stepped into a subroutine call with source code that
5273 we should not step over. Do step to the first line of code in
5277 handle_step_into_function (struct gdbarch
*gdbarch
,
5278 struct execution_control_state
*ecs
)
5281 struct symtab_and_line stop_func_sal
, sr_sal
;
5283 fill_in_stop_func (gdbarch
, ecs
);
5285 s
= find_pc_symtab (stop_pc
);
5286 if (s
&& s
->language
!= language_asm
)
5287 ecs
->stop_func_start
= gdbarch_skip_prologue (gdbarch
,
5288 ecs
->stop_func_start
);
5290 stop_func_sal
= find_pc_line (ecs
->stop_func_start
, 0);
5291 /* Use the step_resume_break to step until the end of the prologue,
5292 even if that involves jumps (as it seems to on the vax under
5294 /* If the prologue ends in the middle of a source line, continue to
5295 the end of that source line (if it is still within the function).
5296 Otherwise, just go to end of prologue. */
5297 if (stop_func_sal
.end
5298 && stop_func_sal
.pc
!= ecs
->stop_func_start
5299 && stop_func_sal
.end
< ecs
->stop_func_end
)
5300 ecs
->stop_func_start
= stop_func_sal
.end
;
5302 /* Architectures which require breakpoint adjustment might not be able
5303 to place a breakpoint at the computed address. If so, the test
5304 ``ecs->stop_func_start == stop_pc'' will never succeed. Adjust
5305 ecs->stop_func_start to an address at which a breakpoint may be
5306 legitimately placed.
5308 Note: kevinb/2004-01-19: On FR-V, if this adjustment is not
5309 made, GDB will enter an infinite loop when stepping through
5310 optimized code consisting of VLIW instructions which contain
5311 subinstructions corresponding to different source lines. On
5312 FR-V, it's not permitted to place a breakpoint on any but the
5313 first subinstruction of a VLIW instruction. When a breakpoint is
5314 set, GDB will adjust the breakpoint address to the beginning of
5315 the VLIW instruction. Thus, we need to make the corresponding
5316 adjustment here when computing the stop address. */
5318 if (gdbarch_adjust_breakpoint_address_p (gdbarch
))
5320 ecs
->stop_func_start
5321 = gdbarch_adjust_breakpoint_address (gdbarch
,
5322 ecs
->stop_func_start
);
5325 if (ecs
->stop_func_start
== stop_pc
)
5327 /* We are already there: stop now. */
5328 ecs
->event_thread
->control
.stop_step
= 1;
5329 print_end_stepping_range_reason ();
5330 stop_stepping (ecs
);
5335 /* Put the step-breakpoint there and go until there. */
5336 init_sal (&sr_sal
); /* initialize to zeroes */
5337 sr_sal
.pc
= ecs
->stop_func_start
;
5338 sr_sal
.section
= find_pc_overlay (ecs
->stop_func_start
);
5339 sr_sal
.pspace
= get_frame_program_space (get_current_frame ());
5341 /* Do not specify what the fp should be when we stop since on
5342 some machines the prologue is where the new fp value is
5344 insert_step_resume_breakpoint_at_sal (gdbarch
, sr_sal
, null_frame_id
);
5346 /* And make sure stepping stops right away then. */
5347 ecs
->event_thread
->control
.step_range_end
5348 = ecs
->event_thread
->control
.step_range_start
;
5353 /* Inferior has stepped backward into a subroutine call with source
5354 code that we should not step over. Do step to the beginning of the
5355 last line of code in it. */
5358 handle_step_into_function_backward (struct gdbarch
*gdbarch
,
5359 struct execution_control_state
*ecs
)
5362 struct symtab_and_line stop_func_sal
;
5364 fill_in_stop_func (gdbarch
, ecs
);
5366 s
= find_pc_symtab (stop_pc
);
5367 if (s
&& s
->language
!= language_asm
)
5368 ecs
->stop_func_start
= gdbarch_skip_prologue (gdbarch
,
5369 ecs
->stop_func_start
);
5371 stop_func_sal
= find_pc_line (stop_pc
, 0);
5373 /* OK, we're just going to keep stepping here. */
5374 if (stop_func_sal
.pc
== stop_pc
)
5376 /* We're there already. Just stop stepping now. */
5377 ecs
->event_thread
->control
.stop_step
= 1;
5378 print_end_stepping_range_reason ();
5379 stop_stepping (ecs
);
5383 /* Else just reset the step range and keep going.
5384 No step-resume breakpoint, they don't work for
5385 epilogues, which can have multiple entry paths. */
5386 ecs
->event_thread
->control
.step_range_start
= stop_func_sal
.pc
;
5387 ecs
->event_thread
->control
.step_range_end
= stop_func_sal
.end
;
5393 /* Insert a "step-resume breakpoint" at SR_SAL with frame ID SR_ID.
5394 This is used to both functions and to skip over code. */
5397 insert_step_resume_breakpoint_at_sal_1 (struct gdbarch
*gdbarch
,
5398 struct symtab_and_line sr_sal
,
5399 struct frame_id sr_id
,
5400 enum bptype sr_type
)
5402 /* There should never be more than one step-resume or longjmp-resume
5403 breakpoint per thread, so we should never be setting a new
5404 step_resume_breakpoint when one is already active. */
5405 gdb_assert (inferior_thread ()->control
.step_resume_breakpoint
== NULL
);
5406 gdb_assert (sr_type
== bp_step_resume
|| sr_type
== bp_hp_step_resume
);
5409 fprintf_unfiltered (gdb_stdlog
,
5410 "infrun: inserting step-resume breakpoint at %s\n",
5411 paddress (gdbarch
, sr_sal
.pc
));
5413 inferior_thread ()->control
.step_resume_breakpoint
5414 = set_momentary_breakpoint (gdbarch
, sr_sal
, sr_id
, sr_type
);
5418 insert_step_resume_breakpoint_at_sal (struct gdbarch
*gdbarch
,
5419 struct symtab_and_line sr_sal
,
5420 struct frame_id sr_id
)
5422 insert_step_resume_breakpoint_at_sal_1 (gdbarch
,
5427 /* Insert a "high-priority step-resume breakpoint" at RETURN_FRAME.pc.
5428 This is used to skip a potential signal handler.
5430 This is called with the interrupted function's frame. The signal
5431 handler, when it returns, will resume the interrupted function at
5435 insert_hp_step_resume_breakpoint_at_frame (struct frame_info
*return_frame
)
5437 struct symtab_and_line sr_sal
;
5438 struct gdbarch
*gdbarch
;
5440 gdb_assert (return_frame
!= NULL
);
5441 init_sal (&sr_sal
); /* initialize to zeros */
5443 gdbarch
= get_frame_arch (return_frame
);
5444 sr_sal
.pc
= gdbarch_addr_bits_remove (gdbarch
, get_frame_pc (return_frame
));
5445 sr_sal
.section
= find_pc_overlay (sr_sal
.pc
);
5446 sr_sal
.pspace
= get_frame_program_space (return_frame
);
5448 insert_step_resume_breakpoint_at_sal_1 (gdbarch
, sr_sal
,
5449 get_stack_frame_id (return_frame
),
5453 /* Insert a "step-resume breakpoint" at the previous frame's PC. This
5454 is used to skip a function after stepping into it (for "next" or if
5455 the called function has no debugging information).
5457 The current function has almost always been reached by single
5458 stepping a call or return instruction. NEXT_FRAME belongs to the
5459 current function, and the breakpoint will be set at the caller's
5462 This is a separate function rather than reusing
5463 insert_hp_step_resume_breakpoint_at_frame in order to avoid
5464 get_prev_frame, which may stop prematurely (see the implementation
5465 of frame_unwind_caller_id for an example). */
5468 insert_step_resume_breakpoint_at_caller (struct frame_info
*next_frame
)
5470 struct symtab_and_line sr_sal
;
5471 struct gdbarch
*gdbarch
;
5473 /* We shouldn't have gotten here if we don't know where the call site
5475 gdb_assert (frame_id_p (frame_unwind_caller_id (next_frame
)));
5477 init_sal (&sr_sal
); /* initialize to zeros */
5479 gdbarch
= frame_unwind_caller_arch (next_frame
);
5480 sr_sal
.pc
= gdbarch_addr_bits_remove (gdbarch
,
5481 frame_unwind_caller_pc (next_frame
));
5482 sr_sal
.section
= find_pc_overlay (sr_sal
.pc
);
5483 sr_sal
.pspace
= frame_unwind_program_space (next_frame
);
5485 insert_step_resume_breakpoint_at_sal (gdbarch
, sr_sal
,
5486 frame_unwind_caller_id (next_frame
));
5489 /* Insert a "longjmp-resume" breakpoint at PC. This is used to set a
5490 new breakpoint at the target of a jmp_buf. The handling of
5491 longjmp-resume uses the same mechanisms used for handling
5492 "step-resume" breakpoints. */
5495 insert_longjmp_resume_breakpoint (struct gdbarch
*gdbarch
, CORE_ADDR pc
)
5497 /* There should never be more than one longjmp-resume breakpoint per
5498 thread, so we should never be setting a new
5499 longjmp_resume_breakpoint when one is already active. */
5500 gdb_assert (inferior_thread ()->control
.exception_resume_breakpoint
== NULL
);
5503 fprintf_unfiltered (gdb_stdlog
,
5504 "infrun: inserting longjmp-resume breakpoint at %s\n",
5505 paddress (gdbarch
, pc
));
5507 inferior_thread ()->control
.exception_resume_breakpoint
=
5508 set_momentary_breakpoint_at_pc (gdbarch
, pc
, bp_longjmp_resume
);
5511 /* Insert an exception resume breakpoint. TP is the thread throwing
5512 the exception. The block B is the block of the unwinder debug hook
5513 function. FRAME is the frame corresponding to the call to this
5514 function. SYM is the symbol of the function argument holding the
5515 target PC of the exception. */
5518 insert_exception_resume_breakpoint (struct thread_info
*tp
,
5520 struct frame_info
*frame
,
5523 volatile struct gdb_exception e
;
5525 /* We want to ignore errors here. */
5526 TRY_CATCH (e
, RETURN_MASK_ERROR
)
5528 struct symbol
*vsym
;
5529 struct value
*value
;
5531 struct breakpoint
*bp
;
5533 vsym
= lookup_symbol (SYMBOL_LINKAGE_NAME (sym
), b
, VAR_DOMAIN
, NULL
);
5534 value
= read_var_value (vsym
, frame
);
5535 /* If the value was optimized out, revert to the old behavior. */
5536 if (! value_optimized_out (value
))
5538 handler
= value_as_address (value
);
5541 fprintf_unfiltered (gdb_stdlog
,
5542 "infrun: exception resume at %lx\n",
5543 (unsigned long) handler
);
5545 bp
= set_momentary_breakpoint_at_pc (get_frame_arch (frame
),
5546 handler
, bp_exception_resume
);
5548 /* set_momentary_breakpoint_at_pc invalidates FRAME. */
5551 bp
->thread
= tp
->num
;
5552 inferior_thread ()->control
.exception_resume_breakpoint
= bp
;
5557 /* A helper for check_exception_resume that sets an
5558 exception-breakpoint based on a SystemTap probe. */
5561 insert_exception_resume_from_probe (struct thread_info
*tp
,
5562 const struct probe
*probe
,
5563 struct frame_info
*frame
)
5565 struct value
*arg_value
;
5567 struct breakpoint
*bp
;
5569 arg_value
= probe_safe_evaluate_at_pc (frame
, 1);
5573 handler
= value_as_address (arg_value
);
5576 fprintf_unfiltered (gdb_stdlog
,
5577 "infrun: exception resume at %s\n",
5578 paddress (get_objfile_arch (probe
->objfile
),
5581 bp
= set_momentary_breakpoint_at_pc (get_frame_arch (frame
),
5582 handler
, bp_exception_resume
);
5583 bp
->thread
= tp
->num
;
5584 inferior_thread ()->control
.exception_resume_breakpoint
= bp
;
5587 /* This is called when an exception has been intercepted. Check to
5588 see whether the exception's destination is of interest, and if so,
5589 set an exception resume breakpoint there. */
5592 check_exception_resume (struct execution_control_state
*ecs
,
5593 struct frame_info
*frame
)
5595 volatile struct gdb_exception e
;
5596 const struct probe
*probe
;
5597 struct symbol
*func
;
5599 /* First see if this exception unwinding breakpoint was set via a
5600 SystemTap probe point. If so, the probe has two arguments: the
5601 CFA and the HANDLER. We ignore the CFA, extract the handler, and
5602 set a breakpoint there. */
5603 probe
= find_probe_by_pc (get_frame_pc (frame
));
5606 insert_exception_resume_from_probe (ecs
->event_thread
, probe
, frame
);
5610 func
= get_frame_function (frame
);
5614 TRY_CATCH (e
, RETURN_MASK_ERROR
)
5617 struct block_iterator iter
;
5621 /* The exception breakpoint is a thread-specific breakpoint on
5622 the unwinder's debug hook, declared as:
5624 void _Unwind_DebugHook (void *cfa, void *handler);
5626 The CFA argument indicates the frame to which control is
5627 about to be transferred. HANDLER is the destination PC.
5629 We ignore the CFA and set a temporary breakpoint at HANDLER.
5630 This is not extremely efficient but it avoids issues in gdb
5631 with computing the DWARF CFA, and it also works even in weird
5632 cases such as throwing an exception from inside a signal
5635 b
= SYMBOL_BLOCK_VALUE (func
);
5636 ALL_BLOCK_SYMBOLS (b
, iter
, sym
)
5638 if (!SYMBOL_IS_ARGUMENT (sym
))
5645 insert_exception_resume_breakpoint (ecs
->event_thread
,
5654 stop_stepping (struct execution_control_state
*ecs
)
5657 fprintf_unfiltered (gdb_stdlog
, "infrun: stop_stepping\n");
5659 /* Let callers know we don't want to wait for the inferior anymore. */
5660 ecs
->wait_some_more
= 0;
5663 /* This function handles various cases where we need to continue
5664 waiting for the inferior. */
5665 /* (Used to be the keep_going: label in the old wait_for_inferior). */
5668 keep_going (struct execution_control_state
*ecs
)
5670 /* Make sure normal_stop is called if we get a QUIT handled before
5672 struct cleanup
*old_cleanups
= make_cleanup (resume_cleanups
, 0);
5674 /* Save the pc before execution, to compare with pc after stop. */
5675 ecs
->event_thread
->prev_pc
5676 = regcache_read_pc (get_thread_regcache (ecs
->ptid
));
5678 /* If we did not do break;, it means we should keep running the
5679 inferior and not return to debugger. */
5681 if (ecs
->event_thread
->control
.trap_expected
5682 && ecs
->event_thread
->suspend
.stop_signal
!= GDB_SIGNAL_TRAP
)
5684 /* We took a signal (which we are supposed to pass through to
5685 the inferior, else we'd not get here) and we haven't yet
5686 gotten our trap. Simply continue. */
5688 discard_cleanups (old_cleanups
);
5689 resume (currently_stepping (ecs
->event_thread
),
5690 ecs
->event_thread
->suspend
.stop_signal
);
5694 /* Either the trap was not expected, but we are continuing
5695 anyway (the user asked that this signal be passed to the
5698 The signal was SIGTRAP, e.g. it was our signal, but we
5699 decided we should resume from it.
5701 We're going to run this baby now!
5703 Note that insert_breakpoints won't try to re-insert
5704 already inserted breakpoints. Therefore, we don't
5705 care if breakpoints were already inserted, or not. */
5707 if (ecs
->event_thread
->stepping_over_breakpoint
)
5709 struct regcache
*thread_regcache
= get_thread_regcache (ecs
->ptid
);
5711 if (!use_displaced_stepping (get_regcache_arch (thread_regcache
)))
5712 /* Since we can't do a displaced step, we have to remove
5713 the breakpoint while we step it. To keep things
5714 simple, we remove them all. */
5715 remove_breakpoints ();
5719 volatile struct gdb_exception e
;
5721 /* Stop stepping when inserting breakpoints
5723 TRY_CATCH (e
, RETURN_MASK_ERROR
)
5725 insert_breakpoints ();
5729 exception_print (gdb_stderr
, e
);
5730 stop_stepping (ecs
);
5735 ecs
->event_thread
->control
.trap_expected
5736 = ecs
->event_thread
->stepping_over_breakpoint
;
5738 /* Do not deliver SIGNAL_TRAP (except when the user explicitly
5739 specifies that such a signal should be delivered to the
5742 Typically, this would occure when a user is debugging a
5743 target monitor on a simulator: the target monitor sets a
5744 breakpoint; the simulator encounters this break-point and
5745 halts the simulation handing control to GDB; GDB, noteing
5746 that the break-point isn't valid, returns control back to the
5747 simulator; the simulator then delivers the hardware
5748 equivalent of a SIGNAL_TRAP to the program being debugged. */
5750 if (ecs
->event_thread
->suspend
.stop_signal
== GDB_SIGNAL_TRAP
5751 && !signal_program
[ecs
->event_thread
->suspend
.stop_signal
])
5752 ecs
->event_thread
->suspend
.stop_signal
= GDB_SIGNAL_0
;
5754 discard_cleanups (old_cleanups
);
5755 resume (currently_stepping (ecs
->event_thread
),
5756 ecs
->event_thread
->suspend
.stop_signal
);
5759 prepare_to_wait (ecs
);
5762 /* This function normally comes after a resume, before
5763 handle_inferior_event exits. It takes care of any last bits of
5764 housekeeping, and sets the all-important wait_some_more flag. */
5767 prepare_to_wait (struct execution_control_state
*ecs
)
5770 fprintf_unfiltered (gdb_stdlog
, "infrun: prepare_to_wait\n");
5772 /* This is the old end of the while loop. Let everybody know we
5773 want to wait for the inferior some more and get called again
5775 ecs
->wait_some_more
= 1;
5778 /* Several print_*_reason functions to print why the inferior has stopped.
5779 We always print something when the inferior exits, or receives a signal.
5780 The rest of the cases are dealt with later on in normal_stop and
5781 print_it_typical. Ideally there should be a call to one of these
5782 print_*_reason functions functions from handle_inferior_event each time
5783 stop_stepping is called. */
5785 /* Print why the inferior has stopped.
5786 We are done with a step/next/si/ni command, print why the inferior has
5787 stopped. For now print nothing. Print a message only if not in the middle
5788 of doing a "step n" operation for n > 1. */
5791 print_end_stepping_range_reason (void)
5793 if ((!inferior_thread ()->step_multi
5794 || !inferior_thread ()->control
.stop_step
)
5795 && ui_out_is_mi_like_p (current_uiout
))
5796 ui_out_field_string (current_uiout
, "reason",
5797 async_reason_lookup (EXEC_ASYNC_END_STEPPING_RANGE
));
5800 /* The inferior was terminated by a signal, print why it stopped. */
5803 print_signal_exited_reason (enum gdb_signal siggnal
)
5805 struct ui_out
*uiout
= current_uiout
;
5807 annotate_signalled ();
5808 if (ui_out_is_mi_like_p (uiout
))
5810 (uiout
, "reason", async_reason_lookup (EXEC_ASYNC_EXITED_SIGNALLED
));
5811 ui_out_text (uiout
, "\nProgram terminated with signal ");
5812 annotate_signal_name ();
5813 ui_out_field_string (uiout
, "signal-name",
5814 gdb_signal_to_name (siggnal
));
5815 annotate_signal_name_end ();
5816 ui_out_text (uiout
, ", ");
5817 annotate_signal_string ();
5818 ui_out_field_string (uiout
, "signal-meaning",
5819 gdb_signal_to_string (siggnal
));
5820 annotate_signal_string_end ();
5821 ui_out_text (uiout
, ".\n");
5822 ui_out_text (uiout
, "The program no longer exists.\n");
5825 /* The inferior program is finished, print why it stopped. */
5828 print_exited_reason (int exitstatus
)
5830 struct inferior
*inf
= current_inferior ();
5831 const char *pidstr
= target_pid_to_str (pid_to_ptid (inf
->pid
));
5832 struct ui_out
*uiout
= current_uiout
;
5834 annotate_exited (exitstatus
);
5837 if (ui_out_is_mi_like_p (uiout
))
5838 ui_out_field_string (uiout
, "reason",
5839 async_reason_lookup (EXEC_ASYNC_EXITED
));
5840 ui_out_text (uiout
, "[Inferior ");
5841 ui_out_text (uiout
, plongest (inf
->num
));
5842 ui_out_text (uiout
, " (");
5843 ui_out_text (uiout
, pidstr
);
5844 ui_out_text (uiout
, ") exited with code ");
5845 ui_out_field_fmt (uiout
, "exit-code", "0%o", (unsigned int) exitstatus
);
5846 ui_out_text (uiout
, "]\n");
5850 if (ui_out_is_mi_like_p (uiout
))
5852 (uiout
, "reason", async_reason_lookup (EXEC_ASYNC_EXITED_NORMALLY
));
5853 ui_out_text (uiout
, "[Inferior ");
5854 ui_out_text (uiout
, plongest (inf
->num
));
5855 ui_out_text (uiout
, " (");
5856 ui_out_text (uiout
, pidstr
);
5857 ui_out_text (uiout
, ") exited normally]\n");
5859 /* Support the --return-child-result option. */
5860 return_child_result_value
= exitstatus
;
5863 /* Signal received, print why the inferior has stopped. The signal table
5864 tells us to print about it. */
5867 print_signal_received_reason (enum gdb_signal siggnal
)
5869 struct ui_out
*uiout
= current_uiout
;
5873 if (siggnal
== GDB_SIGNAL_0
&& !ui_out_is_mi_like_p (uiout
))
5875 struct thread_info
*t
= inferior_thread ();
5877 ui_out_text (uiout
, "\n[");
5878 ui_out_field_string (uiout
, "thread-name",
5879 target_pid_to_str (t
->ptid
));
5880 ui_out_field_fmt (uiout
, "thread-id", "] #%d", t
->num
);
5881 ui_out_text (uiout
, " stopped");
5885 ui_out_text (uiout
, "\nProgram received signal ");
5886 annotate_signal_name ();
5887 if (ui_out_is_mi_like_p (uiout
))
5889 (uiout
, "reason", async_reason_lookup (EXEC_ASYNC_SIGNAL_RECEIVED
));
5890 ui_out_field_string (uiout
, "signal-name",
5891 gdb_signal_to_name (siggnal
));
5892 annotate_signal_name_end ();
5893 ui_out_text (uiout
, ", ");
5894 annotate_signal_string ();
5895 ui_out_field_string (uiout
, "signal-meaning",
5896 gdb_signal_to_string (siggnal
));
5897 annotate_signal_string_end ();
5899 ui_out_text (uiout
, ".\n");
5902 /* Reverse execution: target ran out of history info, print why the inferior
5906 print_no_history_reason (void)
5908 ui_out_text (current_uiout
, "\nNo more reverse-execution history.\n");
5911 /* Here to return control to GDB when the inferior stops for real.
5912 Print appropriate messages, remove breakpoints, give terminal our modes.
5914 STOP_PRINT_FRAME nonzero means print the executing frame
5915 (pc, function, args, file, line number and line text).
5916 BREAKPOINTS_FAILED nonzero means stop was due to error
5917 attempting to insert breakpoints. */
5922 struct target_waitstatus last
;
5924 struct cleanup
*old_chain
= make_cleanup (null_cleanup
, NULL
);
5926 get_last_target_status (&last_ptid
, &last
);
5928 /* If an exception is thrown from this point on, make sure to
5929 propagate GDB's knowledge of the executing state to the
5930 frontend/user running state. A QUIT is an easy exception to see
5931 here, so do this before any filtered output. */
5933 make_cleanup (finish_thread_state_cleanup
, &minus_one_ptid
);
5934 else if (last
.kind
!= TARGET_WAITKIND_SIGNALLED
5935 && last
.kind
!= TARGET_WAITKIND_EXITED
5936 && last
.kind
!= TARGET_WAITKIND_NO_RESUMED
)
5937 make_cleanup (finish_thread_state_cleanup
, &inferior_ptid
);
5939 /* In non-stop mode, we don't want GDB to switch threads behind the
5940 user's back, to avoid races where the user is typing a command to
5941 apply to thread x, but GDB switches to thread y before the user
5942 finishes entering the command. */
5944 /* As with the notification of thread events, we want to delay
5945 notifying the user that we've switched thread context until
5946 the inferior actually stops.
5948 There's no point in saying anything if the inferior has exited.
5949 Note that SIGNALLED here means "exited with a signal", not
5950 "received a signal". */
5952 && !ptid_equal (previous_inferior_ptid
, inferior_ptid
)
5953 && target_has_execution
5954 && last
.kind
!= TARGET_WAITKIND_SIGNALLED
5955 && last
.kind
!= TARGET_WAITKIND_EXITED
5956 && last
.kind
!= TARGET_WAITKIND_NO_RESUMED
)
5958 target_terminal_ours_for_output ();
5959 printf_filtered (_("[Switching to %s]\n"),
5960 target_pid_to_str (inferior_ptid
));
5961 annotate_thread_changed ();
5962 previous_inferior_ptid
= inferior_ptid
;
5965 if (last
.kind
== TARGET_WAITKIND_NO_RESUMED
)
5967 gdb_assert (sync_execution
|| !target_can_async_p ());
5969 target_terminal_ours_for_output ();
5970 printf_filtered (_("No unwaited-for children left.\n"));
5973 if (!breakpoints_always_inserted_mode () && target_has_execution
)
5975 if (remove_breakpoints ())
5977 target_terminal_ours_for_output ();
5978 printf_filtered (_("Cannot remove breakpoints because "
5979 "program is no longer writable.\nFurther "
5980 "execution is probably impossible.\n"));
5984 /* If an auto-display called a function and that got a signal,
5985 delete that auto-display to avoid an infinite recursion. */
5987 if (stopped_by_random_signal
)
5988 disable_current_display ();
5990 /* Don't print a message if in the middle of doing a "step n"
5991 operation for n > 1 */
5992 if (target_has_execution
5993 && last
.kind
!= TARGET_WAITKIND_SIGNALLED
5994 && last
.kind
!= TARGET_WAITKIND_EXITED
5995 && inferior_thread ()->step_multi
5996 && inferior_thread ()->control
.stop_step
)
5999 target_terminal_ours ();
6000 async_enable_stdin ();
6002 /* Set the current source location. This will also happen if we
6003 display the frame below, but the current SAL will be incorrect
6004 during a user hook-stop function. */
6005 if (has_stack_frames () && !stop_stack_dummy
)
6006 set_current_sal_from_frame (get_current_frame (), 1);
6008 /* Let the user/frontend see the threads as stopped. */
6009 do_cleanups (old_chain
);
6011 /* Look up the hook_stop and run it (CLI internally handles problem
6012 of stop_command's pre-hook not existing). */
6014 catch_errors (hook_stop_stub
, stop_command
,
6015 "Error while running hook_stop:\n", RETURN_MASK_ALL
);
6017 if (!has_stack_frames ())
6020 if (last
.kind
== TARGET_WAITKIND_SIGNALLED
6021 || last
.kind
== TARGET_WAITKIND_EXITED
)
6024 /* Select innermost stack frame - i.e., current frame is frame 0,
6025 and current location is based on that.
6026 Don't do this on return from a stack dummy routine,
6027 or if the program has exited. */
6029 if (!stop_stack_dummy
)
6031 select_frame (get_current_frame ());
6033 /* Print current location without a level number, if
6034 we have changed functions or hit a breakpoint.
6035 Print source line if we have one.
6036 bpstat_print() contains the logic deciding in detail
6037 what to print, based on the event(s) that just occurred. */
6039 /* If --batch-silent is enabled then there's no need to print the current
6040 source location, and to try risks causing an error message about
6041 missing source files. */
6042 if (stop_print_frame
&& !batch_silent
)
6046 int do_frame_printing
= 1;
6047 struct thread_info
*tp
= inferior_thread ();
6049 bpstat_ret
= bpstat_print (tp
->control
.stop_bpstat
, last
.kind
);
6053 /* FIXME: cagney/2002-12-01: Given that a frame ID does
6054 (or should) carry around the function and does (or
6055 should) use that when doing a frame comparison. */
6056 if (tp
->control
.stop_step
6057 && frame_id_eq (tp
->control
.step_frame_id
,
6058 get_frame_id (get_current_frame ()))
6059 && step_start_function
== find_pc_function (stop_pc
))
6060 source_flag
= SRC_LINE
; /* Finished step, just
6061 print source line. */
6063 source_flag
= SRC_AND_LOC
; /* Print location and
6066 case PRINT_SRC_AND_LOC
:
6067 source_flag
= SRC_AND_LOC
; /* Print location and
6070 case PRINT_SRC_ONLY
:
6071 source_flag
= SRC_LINE
;
6074 source_flag
= SRC_LINE
; /* something bogus */
6075 do_frame_printing
= 0;
6078 internal_error (__FILE__
, __LINE__
, _("Unknown value."));
6081 /* The behavior of this routine with respect to the source
6083 SRC_LINE: Print only source line
6084 LOCATION: Print only location
6085 SRC_AND_LOC: Print location and source line. */
6086 if (do_frame_printing
)
6087 print_stack_frame (get_selected_frame (NULL
), 0, source_flag
);
6089 /* Display the auto-display expressions. */
6094 /* Save the function value return registers, if we care.
6095 We might be about to restore their previous contents. */
6096 if (inferior_thread ()->control
.proceed_to_finish
6097 && execution_direction
!= EXEC_REVERSE
)
6099 /* This should not be necessary. */
6101 regcache_xfree (stop_registers
);
6103 /* NB: The copy goes through to the target picking up the value of
6104 all the registers. */
6105 stop_registers
= regcache_dup (get_current_regcache ());
6108 if (stop_stack_dummy
== STOP_STACK_DUMMY
)
6110 /* Pop the empty frame that contains the stack dummy.
6111 This also restores inferior state prior to the call
6112 (struct infcall_suspend_state). */
6113 struct frame_info
*frame
= get_current_frame ();
6115 gdb_assert (get_frame_type (frame
) == DUMMY_FRAME
);
6117 /* frame_pop() calls reinit_frame_cache as the last thing it
6118 does which means there's currently no selected frame. We
6119 don't need to re-establish a selected frame if the dummy call
6120 returns normally, that will be done by
6121 restore_infcall_control_state. However, we do have to handle
6122 the case where the dummy call is returning after being
6123 stopped (e.g. the dummy call previously hit a breakpoint).
6124 We can't know which case we have so just always re-establish
6125 a selected frame here. */
6126 select_frame (get_current_frame ());
6130 annotate_stopped ();
6132 /* Suppress the stop observer if we're in the middle of:
6134 - a step n (n > 1), as there still more steps to be done.
6136 - a "finish" command, as the observer will be called in
6137 finish_command_continuation, so it can include the inferior
6138 function's return value.
6140 - calling an inferior function, as we pretend we inferior didn't
6141 run at all. The return value of the call is handled by the
6142 expression evaluator, through call_function_by_hand. */
6144 if (!target_has_execution
6145 || last
.kind
== TARGET_WAITKIND_SIGNALLED
6146 || last
.kind
== TARGET_WAITKIND_EXITED
6147 || last
.kind
== TARGET_WAITKIND_NO_RESUMED
6148 || (!(inferior_thread ()->step_multi
6149 && inferior_thread ()->control
.stop_step
)
6150 && !(inferior_thread ()->control
.stop_bpstat
6151 && inferior_thread ()->control
.proceed_to_finish
)
6152 && !inferior_thread ()->control
.in_infcall
))
6154 if (!ptid_equal (inferior_ptid
, null_ptid
))
6155 observer_notify_normal_stop (inferior_thread ()->control
.stop_bpstat
,
6158 observer_notify_normal_stop (NULL
, stop_print_frame
);
6161 if (target_has_execution
)
6163 if (last
.kind
!= TARGET_WAITKIND_SIGNALLED
6164 && last
.kind
!= TARGET_WAITKIND_EXITED
)
6165 /* Delete the breakpoint we stopped at, if it wants to be deleted.
6166 Delete any breakpoint that is to be deleted at the next stop. */
6167 breakpoint_auto_delete (inferior_thread ()->control
.stop_bpstat
);
6170 /* Try to get rid of automatically added inferiors that are no
6171 longer needed. Keeping those around slows down things linearly.
6172 Note that this never removes the current inferior. */
6177 hook_stop_stub (void *cmd
)
6179 execute_cmd_pre_hook ((struct cmd_list_element
*) cmd
);
6184 signal_stop_state (int signo
)
6186 return signal_stop
[signo
];
6190 signal_print_state (int signo
)
6192 return signal_print
[signo
];
6196 signal_pass_state (int signo
)
6198 return signal_program
[signo
];
6202 signal_cache_update (int signo
)
6206 for (signo
= 0; signo
< (int) GDB_SIGNAL_LAST
; signo
++)
6207 signal_cache_update (signo
);
6212 signal_pass
[signo
] = (signal_stop
[signo
] == 0
6213 && signal_print
[signo
] == 0
6214 && signal_program
[signo
] == 1
6215 && signal_catch
[signo
] == 0);
6219 signal_stop_update (int signo
, int state
)
6221 int ret
= signal_stop
[signo
];
6223 signal_stop
[signo
] = state
;
6224 signal_cache_update (signo
);
6229 signal_print_update (int signo
, int state
)
6231 int ret
= signal_print
[signo
];
6233 signal_print
[signo
] = state
;
6234 signal_cache_update (signo
);
6239 signal_pass_update (int signo
, int state
)
6241 int ret
= signal_program
[signo
];
6243 signal_program
[signo
] = state
;
6244 signal_cache_update (signo
);
6248 /* Update the global 'signal_catch' from INFO and notify the
6252 signal_catch_update (const unsigned int *info
)
6256 for (i
= 0; i
< GDB_SIGNAL_LAST
; ++i
)
6257 signal_catch
[i
] = info
[i
] > 0;
6258 signal_cache_update (-1);
6259 target_pass_signals ((int) GDB_SIGNAL_LAST
, signal_pass
);
6263 sig_print_header (void)
6265 printf_filtered (_("Signal Stop\tPrint\tPass "
6266 "to program\tDescription\n"));
6270 sig_print_info (enum gdb_signal oursig
)
6272 const char *name
= gdb_signal_to_name (oursig
);
6273 int name_padding
= 13 - strlen (name
);
6275 if (name_padding
<= 0)
6278 printf_filtered ("%s", name
);
6279 printf_filtered ("%*.*s ", name_padding
, name_padding
, " ");
6280 printf_filtered ("%s\t", signal_stop
[oursig
] ? "Yes" : "No");
6281 printf_filtered ("%s\t", signal_print
[oursig
] ? "Yes" : "No");
6282 printf_filtered ("%s\t\t", signal_program
[oursig
] ? "Yes" : "No");
6283 printf_filtered ("%s\n", gdb_signal_to_string (oursig
));
6286 /* Specify how various signals in the inferior should be handled. */
6289 handle_command (char *args
, int from_tty
)
6292 int digits
, wordlen
;
6293 int sigfirst
, signum
, siglast
;
6294 enum gdb_signal oursig
;
6297 unsigned char *sigs
;
6298 struct cleanup
*old_chain
;
6302 error_no_arg (_("signal to handle"));
6305 /* Allocate and zero an array of flags for which signals to handle. */
6307 nsigs
= (int) GDB_SIGNAL_LAST
;
6308 sigs
= (unsigned char *) alloca (nsigs
);
6309 memset (sigs
, 0, nsigs
);
6311 /* Break the command line up into args. */
6313 argv
= gdb_buildargv (args
);
6314 old_chain
= make_cleanup_freeargv (argv
);
6316 /* Walk through the args, looking for signal oursigs, signal names, and
6317 actions. Signal numbers and signal names may be interspersed with
6318 actions, with the actions being performed for all signals cumulatively
6319 specified. Signal ranges can be specified as <LOW>-<HIGH>. */
6321 while (*argv
!= NULL
)
6323 wordlen
= strlen (*argv
);
6324 for (digits
= 0; isdigit ((*argv
)[digits
]); digits
++)
6328 sigfirst
= siglast
= -1;
6330 if (wordlen
>= 1 && !strncmp (*argv
, "all", wordlen
))
6332 /* Apply action to all signals except those used by the
6333 debugger. Silently skip those. */
6336 siglast
= nsigs
- 1;
6338 else if (wordlen
>= 1 && !strncmp (*argv
, "stop", wordlen
))
6340 SET_SIGS (nsigs
, sigs
, signal_stop
);
6341 SET_SIGS (nsigs
, sigs
, signal_print
);
6343 else if (wordlen
>= 1 && !strncmp (*argv
, "ignore", wordlen
))
6345 UNSET_SIGS (nsigs
, sigs
, signal_program
);
6347 else if (wordlen
>= 2 && !strncmp (*argv
, "print", wordlen
))
6349 SET_SIGS (nsigs
, sigs
, signal_print
);
6351 else if (wordlen
>= 2 && !strncmp (*argv
, "pass", wordlen
))
6353 SET_SIGS (nsigs
, sigs
, signal_program
);
6355 else if (wordlen
>= 3 && !strncmp (*argv
, "nostop", wordlen
))
6357 UNSET_SIGS (nsigs
, sigs
, signal_stop
);
6359 else if (wordlen
>= 3 && !strncmp (*argv
, "noignore", wordlen
))
6361 SET_SIGS (nsigs
, sigs
, signal_program
);
6363 else if (wordlen
>= 4 && !strncmp (*argv
, "noprint", wordlen
))
6365 UNSET_SIGS (nsigs
, sigs
, signal_print
);
6366 UNSET_SIGS (nsigs
, sigs
, signal_stop
);
6368 else if (wordlen
>= 4 && !strncmp (*argv
, "nopass", wordlen
))
6370 UNSET_SIGS (nsigs
, sigs
, signal_program
);
6372 else if (digits
> 0)
6374 /* It is numeric. The numeric signal refers to our own
6375 internal signal numbering from target.h, not to host/target
6376 signal number. This is a feature; users really should be
6377 using symbolic names anyway, and the common ones like
6378 SIGHUP, SIGINT, SIGALRM, etc. will work right anyway. */
6380 sigfirst
= siglast
= (int)
6381 gdb_signal_from_command (atoi (*argv
));
6382 if ((*argv
)[digits
] == '-')
6385 gdb_signal_from_command (atoi ((*argv
) + digits
+ 1));
6387 if (sigfirst
> siglast
)
6389 /* Bet he didn't figure we'd think of this case... */
6397 oursig
= gdb_signal_from_name (*argv
);
6398 if (oursig
!= GDB_SIGNAL_UNKNOWN
)
6400 sigfirst
= siglast
= (int) oursig
;
6404 /* Not a number and not a recognized flag word => complain. */
6405 error (_("Unrecognized or ambiguous flag word: \"%s\"."), *argv
);
6409 /* If any signal numbers or symbol names were found, set flags for
6410 which signals to apply actions to. */
6412 for (signum
= sigfirst
; signum
>= 0 && signum
<= siglast
; signum
++)
6414 switch ((enum gdb_signal
) signum
)
6416 case GDB_SIGNAL_TRAP
:
6417 case GDB_SIGNAL_INT
:
6418 if (!allsigs
&& !sigs
[signum
])
6420 if (query (_("%s is used by the debugger.\n\
6421 Are you sure you want to change it? "),
6422 gdb_signal_to_name ((enum gdb_signal
) signum
)))
6428 printf_unfiltered (_("Not confirmed, unchanged.\n"));
6429 gdb_flush (gdb_stdout
);
6434 case GDB_SIGNAL_DEFAULT
:
6435 case GDB_SIGNAL_UNKNOWN
:
6436 /* Make sure that "all" doesn't print these. */
6447 for (signum
= 0; signum
< nsigs
; signum
++)
6450 signal_cache_update (-1);
6451 target_pass_signals ((int) GDB_SIGNAL_LAST
, signal_pass
);
6452 target_program_signals ((int) GDB_SIGNAL_LAST
, signal_program
);
6456 /* Show the results. */
6457 sig_print_header ();
6458 for (; signum
< nsigs
; signum
++)
6460 sig_print_info (signum
);
6466 do_cleanups (old_chain
);
6469 /* Complete the "handle" command. */
6471 static VEC (char_ptr
) *
6472 handle_completer (struct cmd_list_element
*ignore
,
6473 char *text
, char *word
)
6475 VEC (char_ptr
) *vec_signals
, *vec_keywords
, *return_val
;
6476 static const char * const keywords
[] =
6490 vec_signals
= signal_completer (ignore
, text
, word
);
6491 vec_keywords
= complete_on_enum (keywords
, word
, word
);
6493 return_val
= VEC_merge (char_ptr
, vec_signals
, vec_keywords
);
6494 VEC_free (char_ptr
, vec_signals
);
6495 VEC_free (char_ptr
, vec_keywords
);
6500 xdb_handle_command (char *args
, int from_tty
)
6503 struct cleanup
*old_chain
;
6506 error_no_arg (_("xdb command"));
6508 /* Break the command line up into args. */
6510 argv
= gdb_buildargv (args
);
6511 old_chain
= make_cleanup_freeargv (argv
);
6512 if (argv
[1] != (char *) NULL
)
6517 bufLen
= strlen (argv
[0]) + 20;
6518 argBuf
= (char *) xmalloc (bufLen
);
6522 enum gdb_signal oursig
;
6524 oursig
= gdb_signal_from_name (argv
[0]);
6525 memset (argBuf
, 0, bufLen
);
6526 if (strcmp (argv
[1], "Q") == 0)
6527 sprintf (argBuf
, "%s %s", argv
[0], "noprint");
6530 if (strcmp (argv
[1], "s") == 0)
6532 if (!signal_stop
[oursig
])
6533 sprintf (argBuf
, "%s %s", argv
[0], "stop");
6535 sprintf (argBuf
, "%s %s", argv
[0], "nostop");
6537 else if (strcmp (argv
[1], "i") == 0)
6539 if (!signal_program
[oursig
])
6540 sprintf (argBuf
, "%s %s", argv
[0], "pass");
6542 sprintf (argBuf
, "%s %s", argv
[0], "nopass");
6544 else if (strcmp (argv
[1], "r") == 0)
6546 if (!signal_print
[oursig
])
6547 sprintf (argBuf
, "%s %s", argv
[0], "print");
6549 sprintf (argBuf
, "%s %s", argv
[0], "noprint");
6555 handle_command (argBuf
, from_tty
);
6557 printf_filtered (_("Invalid signal handling flag.\n"));
6562 do_cleanups (old_chain
);
6566 gdb_signal_from_command (int num
)
6568 if (num
>= 1 && num
<= 15)
6569 return (enum gdb_signal
) num
;
6570 error (_("Only signals 1-15 are valid as numeric signals.\n\
6571 Use \"info signals\" for a list of symbolic signals."));
6574 /* Print current contents of the tables set by the handle command.
6575 It is possible we should just be printing signals actually used
6576 by the current target (but for things to work right when switching
6577 targets, all signals should be in the signal tables). */
6580 signals_info (char *signum_exp
, int from_tty
)
6582 enum gdb_signal oursig
;
6584 sig_print_header ();
6588 /* First see if this is a symbol name. */
6589 oursig
= gdb_signal_from_name (signum_exp
);
6590 if (oursig
== GDB_SIGNAL_UNKNOWN
)
6592 /* No, try numeric. */
6594 gdb_signal_from_command (parse_and_eval_long (signum_exp
));
6596 sig_print_info (oursig
);
6600 printf_filtered ("\n");
6601 /* These ugly casts brought to you by the native VAX compiler. */
6602 for (oursig
= GDB_SIGNAL_FIRST
;
6603 (int) oursig
< (int) GDB_SIGNAL_LAST
;
6604 oursig
= (enum gdb_signal
) ((int) oursig
+ 1))
6608 if (oursig
!= GDB_SIGNAL_UNKNOWN
6609 && oursig
!= GDB_SIGNAL_DEFAULT
&& oursig
!= GDB_SIGNAL_0
)
6610 sig_print_info (oursig
);
6613 printf_filtered (_("\nUse the \"handle\" command "
6614 "to change these tables.\n"));
6617 /* Check if it makes sense to read $_siginfo from the current thread
6618 at this point. If not, throw an error. */
6621 validate_siginfo_access (void)
6623 /* No current inferior, no siginfo. */
6624 if (ptid_equal (inferior_ptid
, null_ptid
))
6625 error (_("No thread selected."));
6627 /* Don't try to read from a dead thread. */
6628 if (is_exited (inferior_ptid
))
6629 error (_("The current thread has terminated"));
6631 /* ... or from a spinning thread. */
6632 if (is_running (inferior_ptid
))
6633 error (_("Selected thread is running."));
6636 /* The $_siginfo convenience variable is a bit special. We don't know
6637 for sure the type of the value until we actually have a chance to
6638 fetch the data. The type can change depending on gdbarch, so it is
6639 also dependent on which thread you have selected.
6641 1. making $_siginfo be an internalvar that creates a new value on
6644 2. making the value of $_siginfo be an lval_computed value. */
6646 /* This function implements the lval_computed support for reading a
6650 siginfo_value_read (struct value
*v
)
6652 LONGEST transferred
;
6654 validate_siginfo_access ();
6657 target_read (¤t_target
, TARGET_OBJECT_SIGNAL_INFO
,
6659 value_contents_all_raw (v
),
6661 TYPE_LENGTH (value_type (v
)));
6663 if (transferred
!= TYPE_LENGTH (value_type (v
)))
6664 error (_("Unable to read siginfo"));
6667 /* This function implements the lval_computed support for writing a
6671 siginfo_value_write (struct value
*v
, struct value
*fromval
)
6673 LONGEST transferred
;
6675 validate_siginfo_access ();
6677 transferred
= target_write (¤t_target
,
6678 TARGET_OBJECT_SIGNAL_INFO
,
6680 value_contents_all_raw (fromval
),
6682 TYPE_LENGTH (value_type (fromval
)));
6684 if (transferred
!= TYPE_LENGTH (value_type (fromval
)))
6685 error (_("Unable to write siginfo"));
6688 static const struct lval_funcs siginfo_value_funcs
=
6694 /* Return a new value with the correct type for the siginfo object of
6695 the current thread using architecture GDBARCH. Return a void value
6696 if there's no object available. */
6698 static struct value
*
6699 siginfo_make_value (struct gdbarch
*gdbarch
, struct internalvar
*var
,
6702 if (target_has_stack
6703 && !ptid_equal (inferior_ptid
, null_ptid
)
6704 && gdbarch_get_siginfo_type_p (gdbarch
))
6706 struct type
*type
= gdbarch_get_siginfo_type (gdbarch
);
6708 return allocate_computed_value (type
, &siginfo_value_funcs
, NULL
);
6711 return allocate_value (builtin_type (gdbarch
)->builtin_void
);
6715 /* infcall_suspend_state contains state about the program itself like its
6716 registers and any signal it received when it last stopped.
6717 This state must be restored regardless of how the inferior function call
6718 ends (either successfully, or after it hits a breakpoint or signal)
6719 if the program is to properly continue where it left off. */
6721 struct infcall_suspend_state
6723 struct thread_suspend_state thread_suspend
;
6724 #if 0 /* Currently unused and empty structures are not valid C. */
6725 struct inferior_suspend_state inferior_suspend
;
6730 struct regcache
*registers
;
6732 /* Format of SIGINFO_DATA or NULL if it is not present. */
6733 struct gdbarch
*siginfo_gdbarch
;
6735 /* The inferior format depends on SIGINFO_GDBARCH and it has a length of
6736 TYPE_LENGTH (gdbarch_get_siginfo_type ()). For different gdbarch the
6737 content would be invalid. */
6738 gdb_byte
*siginfo_data
;
6741 struct infcall_suspend_state
*
6742 save_infcall_suspend_state (void)
6744 struct infcall_suspend_state
*inf_state
;
6745 struct thread_info
*tp
= inferior_thread ();
6747 struct inferior
*inf
= current_inferior ();
6749 struct regcache
*regcache
= get_current_regcache ();
6750 struct gdbarch
*gdbarch
= get_regcache_arch (regcache
);
6751 gdb_byte
*siginfo_data
= NULL
;
6753 if (gdbarch_get_siginfo_type_p (gdbarch
))
6755 struct type
*type
= gdbarch_get_siginfo_type (gdbarch
);
6756 size_t len
= TYPE_LENGTH (type
);
6757 struct cleanup
*back_to
;
6759 siginfo_data
= xmalloc (len
);
6760 back_to
= make_cleanup (xfree
, siginfo_data
);
6762 if (target_read (¤t_target
, TARGET_OBJECT_SIGNAL_INFO
, NULL
,
6763 siginfo_data
, 0, len
) == len
)
6764 discard_cleanups (back_to
);
6767 /* Errors ignored. */
6768 do_cleanups (back_to
);
6769 siginfo_data
= NULL
;
6773 inf_state
= XZALLOC (struct infcall_suspend_state
);
6777 inf_state
->siginfo_gdbarch
= gdbarch
;
6778 inf_state
->siginfo_data
= siginfo_data
;
6781 inf_state
->thread_suspend
= tp
->suspend
;
6782 #if 0 /* Currently unused and empty structures are not valid C. */
6783 inf_state
->inferior_suspend
= inf
->suspend
;
6786 /* run_inferior_call will not use the signal due to its `proceed' call with
6787 GDB_SIGNAL_0 anyway. */
6788 tp
->suspend
.stop_signal
= GDB_SIGNAL_0
;
6790 inf_state
->stop_pc
= stop_pc
;
6792 inf_state
->registers
= regcache_dup (regcache
);
6797 /* Restore inferior session state to INF_STATE. */
6800 restore_infcall_suspend_state (struct infcall_suspend_state
*inf_state
)
6802 struct thread_info
*tp
= inferior_thread ();
6804 struct inferior
*inf
= current_inferior ();
6806 struct regcache
*regcache
= get_current_regcache ();
6807 struct gdbarch
*gdbarch
= get_regcache_arch (regcache
);
6809 tp
->suspend
= inf_state
->thread_suspend
;
6810 #if 0 /* Currently unused and empty structures are not valid C. */
6811 inf
->suspend
= inf_state
->inferior_suspend
;
6814 stop_pc
= inf_state
->stop_pc
;
6816 if (inf_state
->siginfo_gdbarch
== gdbarch
)
6818 struct type
*type
= gdbarch_get_siginfo_type (gdbarch
);
6820 /* Errors ignored. */
6821 target_write (¤t_target
, TARGET_OBJECT_SIGNAL_INFO
, NULL
,
6822 inf_state
->siginfo_data
, 0, TYPE_LENGTH (type
));
6825 /* The inferior can be gone if the user types "print exit(0)"
6826 (and perhaps other times). */
6827 if (target_has_execution
)
6828 /* NB: The register write goes through to the target. */
6829 regcache_cpy (regcache
, inf_state
->registers
);
6831 discard_infcall_suspend_state (inf_state
);
6835 do_restore_infcall_suspend_state_cleanup (void *state
)
6837 restore_infcall_suspend_state (state
);
6841 make_cleanup_restore_infcall_suspend_state
6842 (struct infcall_suspend_state
*inf_state
)
6844 return make_cleanup (do_restore_infcall_suspend_state_cleanup
, inf_state
);
6848 discard_infcall_suspend_state (struct infcall_suspend_state
*inf_state
)
6850 regcache_xfree (inf_state
->registers
);
6851 xfree (inf_state
->siginfo_data
);
6856 get_infcall_suspend_state_regcache (struct infcall_suspend_state
*inf_state
)
6858 return inf_state
->registers
;
6861 /* infcall_control_state contains state regarding gdb's control of the
6862 inferior itself like stepping control. It also contains session state like
6863 the user's currently selected frame. */
6865 struct infcall_control_state
6867 struct thread_control_state thread_control
;
6868 struct inferior_control_state inferior_control
;
6871 enum stop_stack_kind stop_stack_dummy
;
6872 int stopped_by_random_signal
;
6873 int stop_after_trap
;
6875 /* ID if the selected frame when the inferior function call was made. */
6876 struct frame_id selected_frame_id
;
6879 /* Save all of the information associated with the inferior<==>gdb
6882 struct infcall_control_state
*
6883 save_infcall_control_state (void)
6885 struct infcall_control_state
*inf_status
= xmalloc (sizeof (*inf_status
));
6886 struct thread_info
*tp
= inferior_thread ();
6887 struct inferior
*inf
= current_inferior ();
6889 inf_status
->thread_control
= tp
->control
;
6890 inf_status
->inferior_control
= inf
->control
;
6892 tp
->control
.step_resume_breakpoint
= NULL
;
6893 tp
->control
.exception_resume_breakpoint
= NULL
;
6895 /* Save original bpstat chain to INF_STATUS; replace it in TP with copy of
6896 chain. If caller's caller is walking the chain, they'll be happier if we
6897 hand them back the original chain when restore_infcall_control_state is
6899 tp
->control
.stop_bpstat
= bpstat_copy (tp
->control
.stop_bpstat
);
6902 inf_status
->stop_stack_dummy
= stop_stack_dummy
;
6903 inf_status
->stopped_by_random_signal
= stopped_by_random_signal
;
6904 inf_status
->stop_after_trap
= stop_after_trap
;
6906 inf_status
->selected_frame_id
= get_frame_id (get_selected_frame (NULL
));
6912 restore_selected_frame (void *args
)
6914 struct frame_id
*fid
= (struct frame_id
*) args
;
6915 struct frame_info
*frame
;
6917 frame
= frame_find_by_id (*fid
);
6919 /* If inf_status->selected_frame_id is NULL, there was no previously
6923 warning (_("Unable to restore previously selected frame."));
6927 select_frame (frame
);
6932 /* Restore inferior session state to INF_STATUS. */
6935 restore_infcall_control_state (struct infcall_control_state
*inf_status
)
6937 struct thread_info
*tp
= inferior_thread ();
6938 struct inferior
*inf
= current_inferior ();
6940 if (tp
->control
.step_resume_breakpoint
)
6941 tp
->control
.step_resume_breakpoint
->disposition
= disp_del_at_next_stop
;
6943 if (tp
->control
.exception_resume_breakpoint
)
6944 tp
->control
.exception_resume_breakpoint
->disposition
6945 = disp_del_at_next_stop
;
6947 /* Handle the bpstat_copy of the chain. */
6948 bpstat_clear (&tp
->control
.stop_bpstat
);
6950 tp
->control
= inf_status
->thread_control
;
6951 inf
->control
= inf_status
->inferior_control
;
6954 stop_stack_dummy
= inf_status
->stop_stack_dummy
;
6955 stopped_by_random_signal
= inf_status
->stopped_by_random_signal
;
6956 stop_after_trap
= inf_status
->stop_after_trap
;
6958 if (target_has_stack
)
6960 /* The point of catch_errors is that if the stack is clobbered,
6961 walking the stack might encounter a garbage pointer and
6962 error() trying to dereference it. */
6964 (restore_selected_frame
, &inf_status
->selected_frame_id
,
6965 "Unable to restore previously selected frame:\n",
6966 RETURN_MASK_ERROR
) == 0)
6967 /* Error in restoring the selected frame. Select the innermost
6969 select_frame (get_current_frame ());
6976 do_restore_infcall_control_state_cleanup (void *sts
)
6978 restore_infcall_control_state (sts
);
6982 make_cleanup_restore_infcall_control_state
6983 (struct infcall_control_state
*inf_status
)
6985 return make_cleanup (do_restore_infcall_control_state_cleanup
, inf_status
);
6989 discard_infcall_control_state (struct infcall_control_state
*inf_status
)
6991 if (inf_status
->thread_control
.step_resume_breakpoint
)
6992 inf_status
->thread_control
.step_resume_breakpoint
->disposition
6993 = disp_del_at_next_stop
;
6995 if (inf_status
->thread_control
.exception_resume_breakpoint
)
6996 inf_status
->thread_control
.exception_resume_breakpoint
->disposition
6997 = disp_del_at_next_stop
;
6999 /* See save_infcall_control_state for info on stop_bpstat. */
7000 bpstat_clear (&inf_status
->thread_control
.stop_bpstat
);
7006 ptid_match (ptid_t ptid
, ptid_t filter
)
7008 if (ptid_equal (filter
, minus_one_ptid
))
7010 if (ptid_is_pid (filter
)
7011 && ptid_get_pid (ptid
) == ptid_get_pid (filter
))
7013 else if (ptid_equal (ptid
, filter
))
7019 /* restore_inferior_ptid() will be used by the cleanup machinery
7020 to restore the inferior_ptid value saved in a call to
7021 save_inferior_ptid(). */
7024 restore_inferior_ptid (void *arg
)
7026 ptid_t
*saved_ptid_ptr
= arg
;
7028 inferior_ptid
= *saved_ptid_ptr
;
7032 /* Save the value of inferior_ptid so that it may be restored by a
7033 later call to do_cleanups(). Returns the struct cleanup pointer
7034 needed for later doing the cleanup. */
7037 save_inferior_ptid (void)
7039 ptid_t
*saved_ptid_ptr
;
7041 saved_ptid_ptr
= xmalloc (sizeof (ptid_t
));
7042 *saved_ptid_ptr
= inferior_ptid
;
7043 return make_cleanup (restore_inferior_ptid
, saved_ptid_ptr
);
7047 /* User interface for reverse debugging:
7048 Set exec-direction / show exec-direction commands
7049 (returns error unless target implements to_set_exec_direction method). */
7051 int execution_direction
= EXEC_FORWARD
;
7052 static const char exec_forward
[] = "forward";
7053 static const char exec_reverse
[] = "reverse";
7054 static const char *exec_direction
= exec_forward
;
7055 static const char *const exec_direction_names
[] = {
7062 set_exec_direction_func (char *args
, int from_tty
,
7063 struct cmd_list_element
*cmd
)
7065 if (target_can_execute_reverse
)
7067 if (!strcmp (exec_direction
, exec_forward
))
7068 execution_direction
= EXEC_FORWARD
;
7069 else if (!strcmp (exec_direction
, exec_reverse
))
7070 execution_direction
= EXEC_REVERSE
;
7074 exec_direction
= exec_forward
;
7075 error (_("Target does not support this operation."));
7080 show_exec_direction_func (struct ui_file
*out
, int from_tty
,
7081 struct cmd_list_element
*cmd
, const char *value
)
7083 switch (execution_direction
) {
7085 fprintf_filtered (out
, _("Forward.\n"));
7088 fprintf_filtered (out
, _("Reverse.\n"));
7091 internal_error (__FILE__
, __LINE__
,
7092 _("bogus execution_direction value: %d"),
7093 (int) execution_direction
);
7097 /* User interface for non-stop mode. */
7102 set_non_stop (char *args
, int from_tty
,
7103 struct cmd_list_element
*c
)
7105 if (target_has_execution
)
7107 non_stop_1
= non_stop
;
7108 error (_("Cannot change this setting while the inferior is running."));
7111 non_stop
= non_stop_1
;
7115 show_non_stop (struct ui_file
*file
, int from_tty
,
7116 struct cmd_list_element
*c
, const char *value
)
7118 fprintf_filtered (file
,
7119 _("Controlling the inferior in non-stop mode is %s.\n"),
7124 show_schedule_multiple (struct ui_file
*file
, int from_tty
,
7125 struct cmd_list_element
*c
, const char *value
)
7127 fprintf_filtered (file
, _("Resuming the execution of threads "
7128 "of all processes is %s.\n"), value
);
7131 /* Implementation of `siginfo' variable. */
7133 static const struct internalvar_funcs siginfo_funcs
=
7141 _initialize_infrun (void)
7145 struct cmd_list_element
*c
;
7147 add_info ("signals", signals_info
, _("\
7148 What debugger does when program gets various signals.\n\
7149 Specify a signal as argument to print info on that signal only."));
7150 add_info_alias ("handle", "signals", 0);
7152 c
= add_com ("handle", class_run
, handle_command
, _("\
7153 Specify how to handle signals.\n\
7154 Usage: handle SIGNAL [ACTIONS]\n\
7155 Args are signals and actions to apply to those signals.\n\
7156 If no actions are specified, the current settings for the specified signals\n\
7157 will be displayed instead.\n\
7159 Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\
7160 from 1-15 are allowed for compatibility with old versions of GDB.\n\
7161 Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\
7162 The special arg \"all\" is recognized to mean all signals except those\n\
7163 used by the debugger, typically SIGTRAP and SIGINT.\n\
7165 Recognized actions include \"stop\", \"nostop\", \"print\", \"noprint\",\n\
7166 \"pass\", \"nopass\", \"ignore\", or \"noignore\".\n\
7167 Stop means reenter debugger if this signal happens (implies print).\n\
7168 Print means print a message if this signal happens.\n\
7169 Pass means let program see this signal; otherwise program doesn't know.\n\
7170 Ignore is a synonym for nopass and noignore is a synonym for pass.\n\
7171 Pass and Stop may be combined.\n\
7173 Multiple signals may be specified. Signal numbers and signal names\n\
7174 may be interspersed with actions, with the actions being performed for\n\
7175 all signals cumulatively specified."));
7176 set_cmd_completer (c
, handle_completer
);
7180 add_com ("lz", class_info
, signals_info
, _("\
7181 What debugger does when program gets various signals.\n\
7182 Specify a signal as argument to print info on that signal only."));
7183 add_com ("z", class_run
, xdb_handle_command
, _("\
7184 Specify how to handle a signal.\n\
7185 Args are signals and actions to apply to those signals.\n\
7186 Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\
7187 from 1-15 are allowed for compatibility with old versions of GDB.\n\
7188 Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\
7189 The special arg \"all\" is recognized to mean all signals except those\n\
7190 used by the debugger, typically SIGTRAP and SIGINT.\n\
7191 Recognized actions include \"s\" (toggles between stop and nostop),\n\
7192 \"r\" (toggles between print and noprint), \"i\" (toggles between pass and \
7193 nopass), \"Q\" (noprint)\n\
7194 Stop means reenter debugger if this signal happens (implies print).\n\
7195 Print means print a message if this signal happens.\n\
7196 Pass means let program see this signal; otherwise program doesn't know.\n\
7197 Ignore is a synonym for nopass and noignore is a synonym for pass.\n\
7198 Pass and Stop may be combined."));
7202 stop_command
= add_cmd ("stop", class_obscure
,
7203 not_just_help_class_command
, _("\
7204 There is no `stop' command, but you can set a hook on `stop'.\n\
7205 This allows you to set a list of commands to be run each time execution\n\
7206 of the program stops."), &cmdlist
);
7208 add_setshow_zuinteger_cmd ("infrun", class_maintenance
, &debug_infrun
, _("\
7209 Set inferior debugging."), _("\
7210 Show inferior debugging."), _("\
7211 When non-zero, inferior specific debugging is enabled."),
7214 &setdebuglist
, &showdebuglist
);
7216 add_setshow_boolean_cmd ("displaced", class_maintenance
,
7217 &debug_displaced
, _("\
7218 Set displaced stepping debugging."), _("\
7219 Show displaced stepping debugging."), _("\
7220 When non-zero, displaced stepping specific debugging is enabled."),
7222 show_debug_displaced
,
7223 &setdebuglist
, &showdebuglist
);
7225 add_setshow_boolean_cmd ("non-stop", no_class
,
7227 Set whether gdb controls the inferior in non-stop mode."), _("\
7228 Show whether gdb controls the inferior in non-stop mode."), _("\
7229 When debugging a multi-threaded program and this setting is\n\
7230 off (the default, also called all-stop mode), when one thread stops\n\
7231 (for a breakpoint, watchpoint, exception, or similar events), GDB stops\n\
7232 all other threads in the program while you interact with the thread of\n\
7233 interest. When you continue or step a thread, you can allow the other\n\
7234 threads to run, or have them remain stopped, but while you inspect any\n\
7235 thread's state, all threads stop.\n\
7237 In non-stop mode, when one thread stops, other threads can continue\n\
7238 to run freely. You'll be able to step each thread independently,\n\
7239 leave it stopped or free to run as needed."),
7245 numsigs
= (int) GDB_SIGNAL_LAST
;
7246 signal_stop
= (unsigned char *) xmalloc (sizeof (signal_stop
[0]) * numsigs
);
7247 signal_print
= (unsigned char *)
7248 xmalloc (sizeof (signal_print
[0]) * numsigs
);
7249 signal_program
= (unsigned char *)
7250 xmalloc (sizeof (signal_program
[0]) * numsigs
);
7251 signal_catch
= (unsigned char *)
7252 xmalloc (sizeof (signal_catch
[0]) * numsigs
);
7253 signal_pass
= (unsigned char *)
7254 xmalloc (sizeof (signal_program
[0]) * numsigs
);
7255 for (i
= 0; i
< numsigs
; i
++)
7258 signal_print
[i
] = 1;
7259 signal_program
[i
] = 1;
7260 signal_catch
[i
] = 0;
7263 /* Signals caused by debugger's own actions
7264 should not be given to the program afterwards. */
7265 signal_program
[GDB_SIGNAL_TRAP
] = 0;
7266 signal_program
[GDB_SIGNAL_INT
] = 0;
7268 /* Signals that are not errors should not normally enter the debugger. */
7269 signal_stop
[GDB_SIGNAL_ALRM
] = 0;
7270 signal_print
[GDB_SIGNAL_ALRM
] = 0;
7271 signal_stop
[GDB_SIGNAL_VTALRM
] = 0;
7272 signal_print
[GDB_SIGNAL_VTALRM
] = 0;
7273 signal_stop
[GDB_SIGNAL_PROF
] = 0;
7274 signal_print
[GDB_SIGNAL_PROF
] = 0;
7275 signal_stop
[GDB_SIGNAL_CHLD
] = 0;
7276 signal_print
[GDB_SIGNAL_CHLD
] = 0;
7277 signal_stop
[GDB_SIGNAL_IO
] = 0;
7278 signal_print
[GDB_SIGNAL_IO
] = 0;
7279 signal_stop
[GDB_SIGNAL_POLL
] = 0;
7280 signal_print
[GDB_SIGNAL_POLL
] = 0;
7281 signal_stop
[GDB_SIGNAL_URG
] = 0;
7282 signal_print
[GDB_SIGNAL_URG
] = 0;
7283 signal_stop
[GDB_SIGNAL_WINCH
] = 0;
7284 signal_print
[GDB_SIGNAL_WINCH
] = 0;
7285 signal_stop
[GDB_SIGNAL_PRIO
] = 0;
7286 signal_print
[GDB_SIGNAL_PRIO
] = 0;
7288 /* These signals are used internally by user-level thread
7289 implementations. (See signal(5) on Solaris.) Like the above
7290 signals, a healthy program receives and handles them as part of
7291 its normal operation. */
7292 signal_stop
[GDB_SIGNAL_LWP
] = 0;
7293 signal_print
[GDB_SIGNAL_LWP
] = 0;
7294 signal_stop
[GDB_SIGNAL_WAITING
] = 0;
7295 signal_print
[GDB_SIGNAL_WAITING
] = 0;
7296 signal_stop
[GDB_SIGNAL_CANCEL
] = 0;
7297 signal_print
[GDB_SIGNAL_CANCEL
] = 0;
7299 /* Update cached state. */
7300 signal_cache_update (-1);
7302 add_setshow_zinteger_cmd ("stop-on-solib-events", class_support
,
7303 &stop_on_solib_events
, _("\
7304 Set stopping for shared library events."), _("\
7305 Show stopping for shared library events."), _("\
7306 If nonzero, gdb will give control to the user when the dynamic linker\n\
7307 notifies gdb of shared library events. The most common event of interest\n\
7308 to the user would be loading/unloading of a new library."),
7310 show_stop_on_solib_events
,
7311 &setlist
, &showlist
);
7313 add_setshow_enum_cmd ("follow-fork-mode", class_run
,
7314 follow_fork_mode_kind_names
,
7315 &follow_fork_mode_string
, _("\
7316 Set debugger response to a program call of fork or vfork."), _("\
7317 Show debugger response to a program call of fork or vfork."), _("\
7318 A fork or vfork creates a new process. follow-fork-mode can be:\n\
7319 parent - the original process is debugged after a fork\n\
7320 child - the new process is debugged after a fork\n\
7321 The unfollowed process will continue to run.\n\
7322 By default, the debugger will follow the parent process."),
7324 show_follow_fork_mode_string
,
7325 &setlist
, &showlist
);
7327 add_setshow_enum_cmd ("follow-exec-mode", class_run
,
7328 follow_exec_mode_names
,
7329 &follow_exec_mode_string
, _("\
7330 Set debugger response to a program call of exec."), _("\
7331 Show debugger response to a program call of exec."), _("\
7332 An exec call replaces the program image of a process.\n\
7334 follow-exec-mode can be:\n\
7336 new - the debugger creates a new inferior and rebinds the process\n\
7337 to this new inferior. The program the process was running before\n\
7338 the exec call can be restarted afterwards by restarting the original\n\
7341 same - the debugger keeps the process bound to the same inferior.\n\
7342 The new executable image replaces the previous executable loaded in\n\
7343 the inferior. Restarting the inferior after the exec call restarts\n\
7344 the executable the process was running after the exec call.\n\
7346 By default, the debugger will use the same inferior."),
7348 show_follow_exec_mode_string
,
7349 &setlist
, &showlist
);
7351 add_setshow_enum_cmd ("scheduler-locking", class_run
,
7352 scheduler_enums
, &scheduler_mode
, _("\
7353 Set mode for locking scheduler during execution."), _("\
7354 Show mode for locking scheduler during execution."), _("\
7355 off == no locking (threads may preempt at any time)\n\
7356 on == full locking (no thread except the current thread may run)\n\
7357 step == scheduler locked during every single-step operation.\n\
7358 In this mode, no other thread may run during a step command.\n\
7359 Other threads may run while stepping over a function call ('next')."),
7360 set_schedlock_func
, /* traps on target vector */
7361 show_scheduler_mode
,
7362 &setlist
, &showlist
);
7364 add_setshow_boolean_cmd ("schedule-multiple", class_run
, &sched_multi
, _("\
7365 Set mode for resuming threads of all processes."), _("\
7366 Show mode for resuming threads of all processes."), _("\
7367 When on, execution commands (such as 'continue' or 'next') resume all\n\
7368 threads of all processes. When off (which is the default), execution\n\
7369 commands only resume the threads of the current process. The set of\n\
7370 threads that are resumed is further refined by the scheduler-locking\n\
7371 mode (see help set scheduler-locking)."),
7373 show_schedule_multiple
,
7374 &setlist
, &showlist
);
7376 add_setshow_boolean_cmd ("step-mode", class_run
, &step_stop_if_no_debug
, _("\
7377 Set mode of the step operation."), _("\
7378 Show mode of the step operation."), _("\
7379 When set, doing a step over a function without debug line information\n\
7380 will stop at the first instruction of that function. Otherwise, the\n\
7381 function is skipped and the step command stops at a different source line."),
7383 show_step_stop_if_no_debug
,
7384 &setlist
, &showlist
);
7386 add_setshow_auto_boolean_cmd ("displaced-stepping", class_run
,
7387 &can_use_displaced_stepping
, _("\
7388 Set debugger's willingness to use displaced stepping."), _("\
7389 Show debugger's willingness to use displaced stepping."), _("\
7390 If on, gdb will use displaced stepping to step over breakpoints if it is\n\
7391 supported by the target architecture. If off, gdb will not use displaced\n\
7392 stepping to step over breakpoints, even if such is supported by the target\n\
7393 architecture. If auto (which is the default), gdb will use displaced stepping\n\
7394 if the target architecture supports it and non-stop mode is active, but will not\n\
7395 use it in all-stop mode (see help set non-stop)."),
7397 show_can_use_displaced_stepping
,
7398 &setlist
, &showlist
);
7400 add_setshow_enum_cmd ("exec-direction", class_run
, exec_direction_names
,
7401 &exec_direction
, _("Set direction of execution.\n\
7402 Options are 'forward' or 'reverse'."),
7403 _("Show direction of execution (forward/reverse)."),
7404 _("Tells gdb whether to execute forward or backward."),
7405 set_exec_direction_func
, show_exec_direction_func
,
7406 &setlist
, &showlist
);
7408 /* Set/show detach-on-fork: user-settable mode. */
7410 add_setshow_boolean_cmd ("detach-on-fork", class_run
, &detach_fork
, _("\
7411 Set whether gdb will detach the child of a fork."), _("\
7412 Show whether gdb will detach the child of a fork."), _("\
7413 Tells gdb whether to detach the child of a fork."),
7414 NULL
, NULL
, &setlist
, &showlist
);
7416 /* Set/show disable address space randomization mode. */
7418 add_setshow_boolean_cmd ("disable-randomization", class_support
,
7419 &disable_randomization
, _("\
7420 Set disabling of debuggee's virtual address space randomization."), _("\
7421 Show disabling of debuggee's virtual address space randomization."), _("\
7422 When this mode is on (which is the default), randomization of the virtual\n\
7423 address space is disabled. Standalone programs run with the randomization\n\
7424 enabled by default on some platforms."),
7425 &set_disable_randomization
,
7426 &show_disable_randomization
,
7427 &setlist
, &showlist
);
7429 /* ptid initializations */
7430 inferior_ptid
= null_ptid
;
7431 target_last_wait_ptid
= minus_one_ptid
;
7433 observer_attach_thread_ptid_changed (infrun_thread_ptid_changed
);
7434 observer_attach_thread_stop_requested (infrun_thread_stop_requested
);
7435 observer_attach_thread_exit (infrun_thread_thread_exit
);
7436 observer_attach_inferior_exit (infrun_inferior_exit
);
7438 /* Explicitly create without lookup, since that tries to create a
7439 value with a void typed value, and when we get here, gdbarch
7440 isn't initialized yet. At this point, we're quite sure there
7441 isn't another convenience variable of the same name. */
7442 create_internalvar_type_lazy ("_siginfo", &siginfo_funcs
, NULL
);
7444 add_setshow_boolean_cmd ("observer", no_class
,
7445 &observer_mode_1
, _("\
7446 Set whether gdb controls the inferior in observer mode."), _("\
7447 Show whether gdb controls the inferior in observer mode."), _("\
7448 In observer mode, GDB can get data from the inferior, but not\n\
7449 affect its execution. Registers and memory may not be changed,\n\
7450 breakpoints may not be set, and the program cannot be interrupted\n\