1 /* Target-struct-independent code to start (run) and stop an inferior
4 Copyright (C) 1986-2012 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"
59 /* Prototypes for local functions */
61 static void signals_info (char *, int);
63 static void handle_command (char *, int);
65 static void sig_print_info (enum target_signal
);
67 static void sig_print_header (void);
69 static void resume_cleanups (void *);
71 static int hook_stop_stub (void *);
73 static int restore_selected_frame (void *);
75 static int follow_fork (void);
77 static void set_schedlock_func (char *args
, int from_tty
,
78 struct cmd_list_element
*c
);
80 static int currently_stepping (struct thread_info
*tp
);
82 static int currently_stepping_or_nexting_callback (struct thread_info
*tp
,
85 static void xdb_handle_command (char *args
, int from_tty
);
87 static int prepare_to_proceed (int);
89 static void print_exited_reason (int exitstatus
);
91 static void print_signal_exited_reason (enum target_signal siggnal
);
93 static void print_no_history_reason (void);
95 static void print_signal_received_reason (enum target_signal siggnal
);
97 static void print_end_stepping_range_reason (void);
99 void _initialize_infrun (void);
101 void nullify_last_target_wait_ptid (void);
103 static void insert_hp_step_resume_breakpoint_at_frame (struct frame_info
*);
105 static void insert_step_resume_breakpoint_at_caller (struct frame_info
*);
107 static void insert_longjmp_resume_breakpoint (struct gdbarch
*, CORE_ADDR
);
109 /* When set, stop the 'step' command if we enter a function which has
110 no line number information. The normal behavior is that we step
111 over such function. */
112 int step_stop_if_no_debug
= 0;
114 show_step_stop_if_no_debug (struct ui_file
*file
, int from_tty
,
115 struct cmd_list_element
*c
, const char *value
)
117 fprintf_filtered (file
, _("Mode of the step operation is %s.\n"), value
);
120 /* In asynchronous mode, but simulating synchronous execution. */
122 int sync_execution
= 0;
124 /* wait_for_inferior and normal_stop use this to notify the user
125 when the inferior stopped in a different thread than it had been
128 static ptid_t previous_inferior_ptid
;
130 /* Default behavior is to detach newly forked processes (legacy). */
133 int debug_displaced
= 0;
135 show_debug_displaced (struct ui_file
*file
, int from_tty
,
136 struct cmd_list_element
*c
, const char *value
)
138 fprintf_filtered (file
, _("Displace stepping debugging is %s.\n"), value
);
141 int debug_infrun
= 0;
143 show_debug_infrun (struct ui_file
*file
, int from_tty
,
144 struct cmd_list_element
*c
, const char *value
)
146 fprintf_filtered (file
, _("Inferior debugging is %s.\n"), value
);
150 /* Support for disabling address space randomization. */
152 int disable_randomization
= 1;
155 show_disable_randomization (struct ui_file
*file
, int from_tty
,
156 struct cmd_list_element
*c
, const char *value
)
158 if (target_supports_disable_randomization ())
159 fprintf_filtered (file
,
160 _("Disabling randomization of debuggee's "
161 "virtual address space is %s.\n"),
164 fputs_filtered (_("Disabling randomization of debuggee's "
165 "virtual address space is unsupported on\n"
166 "this platform.\n"), file
);
170 set_disable_randomization (char *args
, int from_tty
,
171 struct cmd_list_element
*c
)
173 if (!target_supports_disable_randomization ())
174 error (_("Disabling randomization of debuggee's "
175 "virtual address space is unsupported on\n"
180 /* If the program uses ELF-style shared libraries, then calls to
181 functions in shared libraries go through stubs, which live in a
182 table called the PLT (Procedure Linkage Table). The first time the
183 function is called, the stub sends control to the dynamic linker,
184 which looks up the function's real address, patches the stub so
185 that future calls will go directly to the function, and then passes
186 control to the function.
188 If we are stepping at the source level, we don't want to see any of
189 this --- we just want to skip over the stub and the dynamic linker.
190 The simple approach is to single-step until control leaves the
193 However, on some systems (e.g., Red Hat's 5.2 distribution) the
194 dynamic linker calls functions in the shared C library, so you
195 can't tell from the PC alone whether the dynamic linker is still
196 running. In this case, we use a step-resume breakpoint to get us
197 past the dynamic linker, as if we were using "next" to step over a
200 in_solib_dynsym_resolve_code() says whether we're in the dynamic
201 linker code or not. Normally, this means we single-step. However,
202 if SKIP_SOLIB_RESOLVER then returns non-zero, then its value is an
203 address where we can place a step-resume breakpoint to get past the
204 linker's symbol resolution function.
206 in_solib_dynsym_resolve_code() can generally be implemented in a
207 pretty portable way, by comparing the PC against the address ranges
208 of the dynamic linker's sections.
210 SKIP_SOLIB_RESOLVER is generally going to be system-specific, since
211 it depends on internal details of the dynamic linker. It's usually
212 not too hard to figure out where to put a breakpoint, but it
213 certainly isn't portable. SKIP_SOLIB_RESOLVER should do plenty of
214 sanity checking. If it can't figure things out, returning zero and
215 getting the (possibly confusing) stepping behavior is better than
216 signalling an error, which will obscure the change in the
219 /* This function returns TRUE if pc is the address of an instruction
220 that lies within the dynamic linker (such as the event hook, or the
223 This function must be used only when a dynamic linker event has
224 been caught, and the inferior is being stepped out of the hook, or
225 undefined results are guaranteed. */
227 #ifndef SOLIB_IN_DYNAMIC_LINKER
228 #define SOLIB_IN_DYNAMIC_LINKER(pid,pc) 0
231 /* "Observer mode" is somewhat like a more extreme version of
232 non-stop, in which all GDB operations that might affect the
233 target's execution have been disabled. */
235 static int non_stop_1
= 0;
237 int observer_mode
= 0;
238 static int observer_mode_1
= 0;
241 set_observer_mode (char *args
, int from_tty
,
242 struct cmd_list_element
*c
)
244 extern int pagination_enabled
;
246 if (target_has_execution
)
248 observer_mode_1
= observer_mode
;
249 error (_("Cannot change this setting while the inferior is running."));
252 observer_mode
= observer_mode_1
;
254 may_write_registers
= !observer_mode
;
255 may_write_memory
= !observer_mode
;
256 may_insert_breakpoints
= !observer_mode
;
257 may_insert_tracepoints
= !observer_mode
;
258 /* We can insert fast tracepoints in or out of observer mode,
259 but enable them if we're going into this mode. */
261 may_insert_fast_tracepoints
= 1;
262 may_stop
= !observer_mode
;
263 update_target_permissions ();
265 /* Going *into* observer mode we must force non-stop, then
266 going out we leave it that way. */
269 target_async_permitted
= 1;
270 pagination_enabled
= 0;
271 non_stop
= non_stop_1
= 1;
275 printf_filtered (_("Observer mode is now %s.\n"),
276 (observer_mode
? "on" : "off"));
280 show_observer_mode (struct ui_file
*file
, int from_tty
,
281 struct cmd_list_element
*c
, const char *value
)
283 fprintf_filtered (file
, _("Observer mode is %s.\n"), value
);
286 /* This updates the value of observer mode based on changes in
287 permissions. Note that we are deliberately ignoring the values of
288 may-write-registers and may-write-memory, since the user may have
289 reason to enable these during a session, for instance to turn on a
290 debugging-related global. */
293 update_observer_mode (void)
297 newval
= (!may_insert_breakpoints
298 && !may_insert_tracepoints
299 && may_insert_fast_tracepoints
303 /* Let the user know if things change. */
304 if (newval
!= observer_mode
)
305 printf_filtered (_("Observer mode is now %s.\n"),
306 (newval
? "on" : "off"));
308 observer_mode
= observer_mode_1
= newval
;
311 /* Tables of how to react to signals; the user sets them. */
313 static unsigned char *signal_stop
;
314 static unsigned char *signal_print
;
315 static unsigned char *signal_program
;
317 /* Table of signals that the target may silently handle.
318 This is automatically determined from the flags above,
319 and simply cached here. */
320 static unsigned char *signal_pass
;
322 #define SET_SIGS(nsigs,sigs,flags) \
324 int signum = (nsigs); \
325 while (signum-- > 0) \
326 if ((sigs)[signum]) \
327 (flags)[signum] = 1; \
330 #define UNSET_SIGS(nsigs,sigs,flags) \
332 int signum = (nsigs); \
333 while (signum-- > 0) \
334 if ((sigs)[signum]) \
335 (flags)[signum] = 0; \
338 /* Update the target's copy of SIGNAL_PROGRAM. The sole purpose of
339 this function is to avoid exporting `signal_program'. */
342 update_signals_program_target (void)
344 target_program_signals ((int) TARGET_SIGNAL_LAST
, signal_program
);
347 /* Value to pass to target_resume() to cause all threads to resume. */
349 #define RESUME_ALL minus_one_ptid
351 /* Command list pointer for the "stop" placeholder. */
353 static struct cmd_list_element
*stop_command
;
355 /* Function inferior was in as of last step command. */
357 static struct symbol
*step_start_function
;
359 /* Nonzero if we want to give control to the user when we're notified
360 of shared library events by the dynamic linker. */
361 int stop_on_solib_events
;
363 show_stop_on_solib_events (struct ui_file
*file
, int from_tty
,
364 struct cmd_list_element
*c
, const char *value
)
366 fprintf_filtered (file
, _("Stopping for shared library events is %s.\n"),
370 /* Nonzero means expecting a trace trap
371 and should stop the inferior and return silently when it happens. */
375 /* Save register contents here when executing a "finish" command or are
376 about to pop a stack dummy frame, if-and-only-if proceed_to_finish is set.
377 Thus this contains the return value from the called function (assuming
378 values are returned in a register). */
380 struct regcache
*stop_registers
;
382 /* Nonzero after stop if current stack frame should be printed. */
384 static int stop_print_frame
;
386 /* This is a cached copy of the pid/waitstatus of the last event
387 returned by target_wait()/deprecated_target_wait_hook(). This
388 information is returned by get_last_target_status(). */
389 static ptid_t target_last_wait_ptid
;
390 static struct target_waitstatus target_last_waitstatus
;
392 static void context_switch (ptid_t ptid
);
394 void init_thread_stepping_state (struct thread_info
*tss
);
396 void init_infwait_state (void);
398 static const char follow_fork_mode_child
[] = "child";
399 static const char follow_fork_mode_parent
[] = "parent";
401 static const char *const follow_fork_mode_kind_names
[] = {
402 follow_fork_mode_child
,
403 follow_fork_mode_parent
,
407 static const char *follow_fork_mode_string
= follow_fork_mode_parent
;
409 show_follow_fork_mode_string (struct ui_file
*file
, int from_tty
,
410 struct cmd_list_element
*c
, const char *value
)
412 fprintf_filtered (file
,
413 _("Debugger response to a program "
414 "call of fork or vfork is \"%s\".\n"),
419 /* Tell the target to follow the fork we're stopped at. Returns true
420 if the inferior should be resumed; false, if the target for some
421 reason decided it's best not to resume. */
426 int follow_child
= (follow_fork_mode_string
== follow_fork_mode_child
);
427 int should_resume
= 1;
428 struct thread_info
*tp
;
430 /* Copy user stepping state to the new inferior thread. FIXME: the
431 followed fork child thread should have a copy of most of the
432 parent thread structure's run control related fields, not just these.
433 Initialized to avoid "may be used uninitialized" warnings from gcc. */
434 struct breakpoint
*step_resume_breakpoint
= NULL
;
435 struct breakpoint
*exception_resume_breakpoint
= NULL
;
436 CORE_ADDR step_range_start
= 0;
437 CORE_ADDR step_range_end
= 0;
438 struct frame_id step_frame_id
= { 0 };
443 struct target_waitstatus wait_status
;
445 /* Get the last target status returned by target_wait(). */
446 get_last_target_status (&wait_ptid
, &wait_status
);
448 /* If not stopped at a fork event, then there's nothing else to
450 if (wait_status
.kind
!= TARGET_WAITKIND_FORKED
451 && wait_status
.kind
!= TARGET_WAITKIND_VFORKED
)
454 /* Check if we switched over from WAIT_PTID, since the event was
456 if (!ptid_equal (wait_ptid
, minus_one_ptid
)
457 && !ptid_equal (inferior_ptid
, wait_ptid
))
459 /* We did. Switch back to WAIT_PTID thread, to tell the
460 target to follow it (in either direction). We'll
461 afterwards refuse to resume, and inform the user what
463 switch_to_thread (wait_ptid
);
468 tp
= inferior_thread ();
470 /* If there were any forks/vforks that were caught and are now to be
471 followed, then do so now. */
472 switch (tp
->pending_follow
.kind
)
474 case TARGET_WAITKIND_FORKED
:
475 case TARGET_WAITKIND_VFORKED
:
477 ptid_t parent
, child
;
479 /* If the user did a next/step, etc, over a fork call,
480 preserve the stepping state in the fork child. */
481 if (follow_child
&& should_resume
)
483 step_resume_breakpoint
= clone_momentary_breakpoint
484 (tp
->control
.step_resume_breakpoint
);
485 step_range_start
= tp
->control
.step_range_start
;
486 step_range_end
= tp
->control
.step_range_end
;
487 step_frame_id
= tp
->control
.step_frame_id
;
488 exception_resume_breakpoint
489 = clone_momentary_breakpoint (tp
->control
.exception_resume_breakpoint
);
491 /* For now, delete the parent's sr breakpoint, otherwise,
492 parent/child sr breakpoints are considered duplicates,
493 and the child version will not be installed. Remove
494 this when the breakpoints module becomes aware of
495 inferiors and address spaces. */
496 delete_step_resume_breakpoint (tp
);
497 tp
->control
.step_range_start
= 0;
498 tp
->control
.step_range_end
= 0;
499 tp
->control
.step_frame_id
= null_frame_id
;
500 delete_exception_resume_breakpoint (tp
);
503 parent
= inferior_ptid
;
504 child
= tp
->pending_follow
.value
.related_pid
;
506 /* Tell the target to do whatever is necessary to follow
507 either parent or child. */
508 if (target_follow_fork (follow_child
))
510 /* Target refused to follow, or there's some other reason
511 we shouldn't resume. */
516 /* This pending follow fork event is now handled, one way
517 or another. The previous selected thread may be gone
518 from the lists by now, but if it is still around, need
519 to clear the pending follow request. */
520 tp
= find_thread_ptid (parent
);
522 tp
->pending_follow
.kind
= TARGET_WAITKIND_SPURIOUS
;
524 /* This makes sure we don't try to apply the "Switched
525 over from WAIT_PID" logic above. */
526 nullify_last_target_wait_ptid ();
528 /* If we followed the child, switch to it... */
531 switch_to_thread (child
);
533 /* ... and preserve the stepping state, in case the
534 user was stepping over the fork call. */
537 tp
= inferior_thread ();
538 tp
->control
.step_resume_breakpoint
539 = step_resume_breakpoint
;
540 tp
->control
.step_range_start
= step_range_start
;
541 tp
->control
.step_range_end
= step_range_end
;
542 tp
->control
.step_frame_id
= step_frame_id
;
543 tp
->control
.exception_resume_breakpoint
544 = exception_resume_breakpoint
;
548 /* If we get here, it was because we're trying to
549 resume from a fork catchpoint, but, the user
550 has switched threads away from the thread that
551 forked. In that case, the resume command
552 issued is most likely not applicable to the
553 child, so just warn, and refuse to resume. */
554 warning (_("Not resuming: switched threads "
555 "before following fork child.\n"));
558 /* Reset breakpoints in the child as appropriate. */
559 follow_inferior_reset_breakpoints ();
562 switch_to_thread (parent
);
566 case TARGET_WAITKIND_SPURIOUS
:
567 /* Nothing to follow. */
570 internal_error (__FILE__
, __LINE__
,
571 "Unexpected pending_follow.kind %d\n",
572 tp
->pending_follow
.kind
);
576 return should_resume
;
580 follow_inferior_reset_breakpoints (void)
582 struct thread_info
*tp
= inferior_thread ();
584 /* Was there a step_resume breakpoint? (There was if the user
585 did a "next" at the fork() call.) If so, explicitly reset its
588 step_resumes are a form of bp that are made to be per-thread.
589 Since we created the step_resume bp when the parent process
590 was being debugged, and now are switching to the child process,
591 from the breakpoint package's viewpoint, that's a switch of
592 "threads". We must update the bp's notion of which thread
593 it is for, or it'll be ignored when it triggers. */
595 if (tp
->control
.step_resume_breakpoint
)
596 breakpoint_re_set_thread (tp
->control
.step_resume_breakpoint
);
598 if (tp
->control
.exception_resume_breakpoint
)
599 breakpoint_re_set_thread (tp
->control
.exception_resume_breakpoint
);
601 /* Reinsert all breakpoints in the child. The user may have set
602 breakpoints after catching the fork, in which case those
603 were never set in the child, but only in the parent. This makes
604 sure the inserted breakpoints match the breakpoint list. */
606 breakpoint_re_set ();
607 insert_breakpoints ();
610 /* The child has exited or execed: resume threads of the parent the
611 user wanted to be executing. */
614 proceed_after_vfork_done (struct thread_info
*thread
,
617 int pid
= * (int *) arg
;
619 if (ptid_get_pid (thread
->ptid
) == pid
620 && is_running (thread
->ptid
)
621 && !is_executing (thread
->ptid
)
622 && !thread
->stop_requested
623 && thread
->suspend
.stop_signal
== TARGET_SIGNAL_0
)
626 fprintf_unfiltered (gdb_stdlog
,
627 "infrun: resuming vfork parent thread %s\n",
628 target_pid_to_str (thread
->ptid
));
630 switch_to_thread (thread
->ptid
);
631 clear_proceed_status ();
632 proceed ((CORE_ADDR
) -1, TARGET_SIGNAL_DEFAULT
, 0);
638 /* Called whenever we notice an exec or exit event, to handle
639 detaching or resuming a vfork parent. */
642 handle_vfork_child_exec_or_exit (int exec
)
644 struct inferior
*inf
= current_inferior ();
646 if (inf
->vfork_parent
)
648 int resume_parent
= -1;
650 /* This exec or exit marks the end of the shared memory region
651 between the parent and the child. If the user wanted to
652 detach from the parent, now is the time. */
654 if (inf
->vfork_parent
->pending_detach
)
656 struct thread_info
*tp
;
657 struct cleanup
*old_chain
;
658 struct program_space
*pspace
;
659 struct address_space
*aspace
;
661 /* follow-fork child, detach-on-fork on. */
663 old_chain
= make_cleanup_restore_current_thread ();
665 /* We're letting loose of the parent. */
666 tp
= any_live_thread_of_process (inf
->vfork_parent
->pid
);
667 switch_to_thread (tp
->ptid
);
669 /* We're about to detach from the parent, which implicitly
670 removes breakpoints from its address space. There's a
671 catch here: we want to reuse the spaces for the child,
672 but, parent/child are still sharing the pspace at this
673 point, although the exec in reality makes the kernel give
674 the child a fresh set of new pages. The problem here is
675 that the breakpoints module being unaware of this, would
676 likely chose the child process to write to the parent
677 address space. Swapping the child temporarily away from
678 the spaces has the desired effect. Yes, this is "sort
681 pspace
= inf
->pspace
;
682 aspace
= inf
->aspace
;
686 if (debug_infrun
|| info_verbose
)
688 target_terminal_ours ();
691 fprintf_filtered (gdb_stdlog
,
692 "Detaching vfork parent process "
693 "%d after child exec.\n",
694 inf
->vfork_parent
->pid
);
696 fprintf_filtered (gdb_stdlog
,
697 "Detaching vfork parent process "
698 "%d after child exit.\n",
699 inf
->vfork_parent
->pid
);
702 target_detach (NULL
, 0);
705 inf
->pspace
= pspace
;
706 inf
->aspace
= aspace
;
708 do_cleanups (old_chain
);
712 /* We're staying attached to the parent, so, really give the
713 child a new address space. */
714 inf
->pspace
= add_program_space (maybe_new_address_space ());
715 inf
->aspace
= inf
->pspace
->aspace
;
717 set_current_program_space (inf
->pspace
);
719 resume_parent
= inf
->vfork_parent
->pid
;
721 /* Break the bonds. */
722 inf
->vfork_parent
->vfork_child
= NULL
;
726 struct cleanup
*old_chain
;
727 struct program_space
*pspace
;
729 /* If this is a vfork child exiting, then the pspace and
730 aspaces were shared with the parent. Since we're
731 reporting the process exit, we'll be mourning all that is
732 found in the address space, and switching to null_ptid,
733 preparing to start a new inferior. But, since we don't
734 want to clobber the parent's address/program spaces, we
735 go ahead and create a new one for this exiting
738 /* Switch to null_ptid, so that clone_program_space doesn't want
739 to read the selected frame of a dead process. */
740 old_chain
= save_inferior_ptid ();
741 inferior_ptid
= null_ptid
;
743 /* This inferior is dead, so avoid giving the breakpoints
744 module the option to write through to it (cloning a
745 program space resets breakpoints). */
748 pspace
= add_program_space (maybe_new_address_space ());
749 set_current_program_space (pspace
);
751 inf
->symfile_flags
= SYMFILE_NO_READ
;
752 clone_program_space (pspace
, inf
->vfork_parent
->pspace
);
753 inf
->pspace
= pspace
;
754 inf
->aspace
= pspace
->aspace
;
756 /* Put back inferior_ptid. We'll continue mourning this
758 do_cleanups (old_chain
);
760 resume_parent
= inf
->vfork_parent
->pid
;
761 /* Break the bonds. */
762 inf
->vfork_parent
->vfork_child
= NULL
;
765 inf
->vfork_parent
= NULL
;
767 gdb_assert (current_program_space
== inf
->pspace
);
769 if (non_stop
&& resume_parent
!= -1)
771 /* If the user wanted the parent to be running, let it go
773 struct cleanup
*old_chain
= make_cleanup_restore_current_thread ();
776 fprintf_unfiltered (gdb_stdlog
,
777 "infrun: resuming vfork parent process %d\n",
780 iterate_over_threads (proceed_after_vfork_done
, &resume_parent
);
782 do_cleanups (old_chain
);
787 /* Enum strings for "set|show displaced-stepping". */
789 static const char follow_exec_mode_new
[] = "new";
790 static const char follow_exec_mode_same
[] = "same";
791 static const char *const follow_exec_mode_names
[] =
793 follow_exec_mode_new
,
794 follow_exec_mode_same
,
798 static const char *follow_exec_mode_string
= follow_exec_mode_same
;
800 show_follow_exec_mode_string (struct ui_file
*file
, int from_tty
,
801 struct cmd_list_element
*c
, const char *value
)
803 fprintf_filtered (file
, _("Follow exec mode is \"%s\".\n"), value
);
806 /* EXECD_PATHNAME is assumed to be non-NULL. */
809 follow_exec (ptid_t pid
, char *execd_pathname
)
811 struct thread_info
*th
= inferior_thread ();
812 struct inferior
*inf
= current_inferior ();
814 /* This is an exec event that we actually wish to pay attention to.
815 Refresh our symbol table to the newly exec'd program, remove any
818 If there are breakpoints, they aren't really inserted now,
819 since the exec() transformed our inferior into a fresh set
822 We want to preserve symbolic breakpoints on the list, since
823 we have hopes that they can be reset after the new a.out's
824 symbol table is read.
826 However, any "raw" breakpoints must be removed from the list
827 (e.g., the solib bp's), since their address is probably invalid
830 And, we DON'T want to call delete_breakpoints() here, since
831 that may write the bp's "shadow contents" (the instruction
832 value that was overwritten witha TRAP instruction). Since
833 we now have a new a.out, those shadow contents aren't valid. */
835 mark_breakpoints_out ();
837 update_breakpoints_after_exec ();
839 /* If there was one, it's gone now. We cannot truly step-to-next
840 statement through an exec(). */
841 th
->control
.step_resume_breakpoint
= NULL
;
842 th
->control
.exception_resume_breakpoint
= NULL
;
843 th
->control
.step_range_start
= 0;
844 th
->control
.step_range_end
= 0;
846 /* The target reports the exec event to the main thread, even if
847 some other thread does the exec, and even if the main thread was
848 already stopped --- if debugging in non-stop mode, it's possible
849 the user had the main thread held stopped in the previous image
850 --- release it now. This is the same behavior as step-over-exec
851 with scheduler-locking on in all-stop mode. */
852 th
->stop_requested
= 0;
854 /* What is this a.out's name? */
855 printf_unfiltered (_("%s is executing new program: %s\n"),
856 target_pid_to_str (inferior_ptid
),
859 /* We've followed the inferior through an exec. Therefore, the
860 inferior has essentially been killed & reborn. */
862 gdb_flush (gdb_stdout
);
864 breakpoint_init_inferior (inf_execd
);
866 if (gdb_sysroot
&& *gdb_sysroot
)
868 char *name
= alloca (strlen (gdb_sysroot
)
869 + strlen (execd_pathname
)
872 strcpy (name
, gdb_sysroot
);
873 strcat (name
, execd_pathname
);
874 execd_pathname
= name
;
877 /* Reset the shared library package. This ensures that we get a
878 shlib event when the child reaches "_start", at which point the
879 dld will have had a chance to initialize the child. */
880 /* Also, loading a symbol file below may trigger symbol lookups, and
881 we don't want those to be satisfied by the libraries of the
882 previous incarnation of this process. */
883 no_shared_libraries (NULL
, 0);
885 if (follow_exec_mode_string
== follow_exec_mode_new
)
887 struct program_space
*pspace
;
889 /* The user wants to keep the old inferior and program spaces
890 around. Create a new fresh one, and switch to it. */
892 inf
= add_inferior (current_inferior ()->pid
);
893 pspace
= add_program_space (maybe_new_address_space ());
894 inf
->pspace
= pspace
;
895 inf
->aspace
= pspace
->aspace
;
897 exit_inferior_num_silent (current_inferior ()->num
);
899 set_current_inferior (inf
);
900 set_current_program_space (pspace
);
903 gdb_assert (current_program_space
== inf
->pspace
);
905 /* That a.out is now the one to use. */
906 exec_file_attach (execd_pathname
, 0);
908 /* SYMFILE_DEFER_BP_RESET is used as the proper displacement for PIE
909 (Position Independent Executable) main symbol file will get applied by
910 solib_create_inferior_hook below. breakpoint_re_set would fail to insert
911 the breakpoints with the zero displacement. */
913 symbol_file_add (execd_pathname
,
915 | SYMFILE_MAINLINE
| SYMFILE_DEFER_BP_RESET
),
918 if ((inf
->symfile_flags
& SYMFILE_NO_READ
) == 0)
919 set_initial_language ();
921 #ifdef SOLIB_CREATE_INFERIOR_HOOK
922 SOLIB_CREATE_INFERIOR_HOOK (PIDGET (inferior_ptid
));
924 solib_create_inferior_hook (0);
927 jit_inferior_created_hook ();
929 breakpoint_re_set ();
931 /* Reinsert all breakpoints. (Those which were symbolic have
932 been reset to the proper address in the new a.out, thanks
933 to symbol_file_command...). */
934 insert_breakpoints ();
936 /* The next resume of this inferior should bring it to the shlib
937 startup breakpoints. (If the user had also set bp's on
938 "main" from the old (parent) process, then they'll auto-
939 matically get reset there in the new process.). */
942 /* Non-zero if we just simulating a single-step. This is needed
943 because we cannot remove the breakpoints in the inferior process
944 until after the `wait' in `wait_for_inferior'. */
945 static int singlestep_breakpoints_inserted_p
= 0;
947 /* The thread we inserted single-step breakpoints for. */
948 static ptid_t singlestep_ptid
;
950 /* PC when we started this single-step. */
951 static CORE_ADDR singlestep_pc
;
953 /* If another thread hit the singlestep breakpoint, we save the original
954 thread here so that we can resume single-stepping it later. */
955 static ptid_t saved_singlestep_ptid
;
956 static int stepping_past_singlestep_breakpoint
;
958 /* If not equal to null_ptid, this means that after stepping over breakpoint
959 is finished, we need to switch to deferred_step_ptid, and step it.
961 The use case is when one thread has hit a breakpoint, and then the user
962 has switched to another thread and issued 'step'. We need to step over
963 breakpoint in the thread which hit the breakpoint, but then continue
964 stepping the thread user has selected. */
965 static ptid_t deferred_step_ptid
;
967 /* Displaced stepping. */
969 /* In non-stop debugging mode, we must take special care to manage
970 breakpoints properly; in particular, the traditional strategy for
971 stepping a thread past a breakpoint it has hit is unsuitable.
972 'Displaced stepping' is a tactic for stepping one thread past a
973 breakpoint it has hit while ensuring that other threads running
974 concurrently will hit the breakpoint as they should.
976 The traditional way to step a thread T off a breakpoint in a
977 multi-threaded program in all-stop mode is as follows:
979 a0) Initially, all threads are stopped, and breakpoints are not
981 a1) We single-step T, leaving breakpoints uninserted.
982 a2) We insert breakpoints, and resume all threads.
984 In non-stop debugging, however, this strategy is unsuitable: we
985 don't want to have to stop all threads in the system in order to
986 continue or step T past a breakpoint. Instead, we use displaced
989 n0) Initially, T is stopped, other threads are running, and
990 breakpoints are inserted.
991 n1) We copy the instruction "under" the breakpoint to a separate
992 location, outside the main code stream, making any adjustments
993 to the instruction, register, and memory state as directed by
995 n2) We single-step T over the instruction at its new location.
996 n3) We adjust the resulting register and memory state as directed
997 by T's architecture. This includes resetting T's PC to point
998 back into the main instruction stream.
1001 This approach depends on the following gdbarch methods:
1003 - gdbarch_max_insn_length and gdbarch_displaced_step_location
1004 indicate where to copy the instruction, and how much space must
1005 be reserved there. We use these in step n1.
1007 - gdbarch_displaced_step_copy_insn copies a instruction to a new
1008 address, and makes any necessary adjustments to the instruction,
1009 register contents, and memory. We use this in step n1.
1011 - gdbarch_displaced_step_fixup adjusts registers and memory after
1012 we have successfuly single-stepped the instruction, to yield the
1013 same effect the instruction would have had if we had executed it
1014 at its original address. We use this in step n3.
1016 - gdbarch_displaced_step_free_closure provides cleanup.
1018 The gdbarch_displaced_step_copy_insn and
1019 gdbarch_displaced_step_fixup functions must be written so that
1020 copying an instruction with gdbarch_displaced_step_copy_insn,
1021 single-stepping across the copied instruction, and then applying
1022 gdbarch_displaced_insn_fixup should have the same effects on the
1023 thread's memory and registers as stepping the instruction in place
1024 would have. Exactly which responsibilities fall to the copy and
1025 which fall to the fixup is up to the author of those functions.
1027 See the comments in gdbarch.sh for details.
1029 Note that displaced stepping and software single-step cannot
1030 currently be used in combination, although with some care I think
1031 they could be made to. Software single-step works by placing
1032 breakpoints on all possible subsequent instructions; if the
1033 displaced instruction is a PC-relative jump, those breakpoints
1034 could fall in very strange places --- on pages that aren't
1035 executable, or at addresses that are not proper instruction
1036 boundaries. (We do generally let other threads run while we wait
1037 to hit the software single-step breakpoint, and they might
1038 encounter such a corrupted instruction.) One way to work around
1039 this would be to have gdbarch_displaced_step_copy_insn fully
1040 simulate the effect of PC-relative instructions (and return NULL)
1041 on architectures that use software single-stepping.
1043 In non-stop mode, we can have independent and simultaneous step
1044 requests, so more than one thread may need to simultaneously step
1045 over a breakpoint. The current implementation assumes there is
1046 only one scratch space per process. In this case, we have to
1047 serialize access to the scratch space. If thread A wants to step
1048 over a breakpoint, but we are currently waiting for some other
1049 thread to complete a displaced step, we leave thread A stopped and
1050 place it in the displaced_step_request_queue. Whenever a displaced
1051 step finishes, we pick the next thread in the queue and start a new
1052 displaced step operation on it. See displaced_step_prepare and
1053 displaced_step_fixup for details. */
1055 struct displaced_step_request
1058 struct displaced_step_request
*next
;
1061 /* Per-inferior displaced stepping state. */
1062 struct displaced_step_inferior_state
1064 /* Pointer to next in linked list. */
1065 struct displaced_step_inferior_state
*next
;
1067 /* The process this displaced step state refers to. */
1070 /* A queue of pending displaced stepping requests. One entry per
1071 thread that needs to do a displaced step. */
1072 struct displaced_step_request
*step_request_queue
;
1074 /* If this is not null_ptid, this is the thread carrying out a
1075 displaced single-step in process PID. This thread's state will
1076 require fixing up once it has completed its step. */
1079 /* The architecture the thread had when we stepped it. */
1080 struct gdbarch
*step_gdbarch
;
1082 /* The closure provided gdbarch_displaced_step_copy_insn, to be used
1083 for post-step cleanup. */
1084 struct displaced_step_closure
*step_closure
;
1086 /* The address of the original instruction, and the copy we
1088 CORE_ADDR step_original
, step_copy
;
1090 /* Saved contents of copy area. */
1091 gdb_byte
*step_saved_copy
;
1094 /* The list of states of processes involved in displaced stepping
1096 static struct displaced_step_inferior_state
*displaced_step_inferior_states
;
1098 /* Get the displaced stepping state of process PID. */
1100 static struct displaced_step_inferior_state
*
1101 get_displaced_stepping_state (int pid
)
1103 struct displaced_step_inferior_state
*state
;
1105 for (state
= displaced_step_inferior_states
;
1107 state
= state
->next
)
1108 if (state
->pid
== pid
)
1114 /* Add a new displaced stepping state for process PID to the displaced
1115 stepping state list, or return a pointer to an already existing
1116 entry, if it already exists. Never returns NULL. */
1118 static struct displaced_step_inferior_state
*
1119 add_displaced_stepping_state (int pid
)
1121 struct displaced_step_inferior_state
*state
;
1123 for (state
= displaced_step_inferior_states
;
1125 state
= state
->next
)
1126 if (state
->pid
== pid
)
1129 state
= xcalloc (1, sizeof (*state
));
1131 state
->next
= displaced_step_inferior_states
;
1132 displaced_step_inferior_states
= state
;
1137 /* If inferior is in displaced stepping, and ADDR equals to starting address
1138 of copy area, return corresponding displaced_step_closure. Otherwise,
1141 struct displaced_step_closure
*
1142 get_displaced_step_closure_by_addr (CORE_ADDR addr
)
1144 struct displaced_step_inferior_state
*displaced
1145 = get_displaced_stepping_state (ptid_get_pid (inferior_ptid
));
1147 /* If checking the mode of displaced instruction in copy area. */
1148 if (displaced
&& !ptid_equal (displaced
->step_ptid
, null_ptid
)
1149 && (displaced
->step_copy
== addr
))
1150 return displaced
->step_closure
;
1155 /* Remove the displaced stepping state of process PID. */
1158 remove_displaced_stepping_state (int pid
)
1160 struct displaced_step_inferior_state
*it
, **prev_next_p
;
1162 gdb_assert (pid
!= 0);
1164 it
= displaced_step_inferior_states
;
1165 prev_next_p
= &displaced_step_inferior_states
;
1170 *prev_next_p
= it
->next
;
1175 prev_next_p
= &it
->next
;
1181 infrun_inferior_exit (struct inferior
*inf
)
1183 remove_displaced_stepping_state (inf
->pid
);
1186 /* Enum strings for "set|show displaced-stepping". */
1188 static const char can_use_displaced_stepping_auto
[] = "auto";
1189 static const char can_use_displaced_stepping_on
[] = "on";
1190 static const char can_use_displaced_stepping_off
[] = "off";
1191 static const char *const can_use_displaced_stepping_enum
[] =
1193 can_use_displaced_stepping_auto
,
1194 can_use_displaced_stepping_on
,
1195 can_use_displaced_stepping_off
,
1199 /* If ON, and the architecture supports it, GDB will use displaced
1200 stepping to step over breakpoints. If OFF, or if the architecture
1201 doesn't support it, GDB will instead use the traditional
1202 hold-and-step approach. If AUTO (which is the default), GDB will
1203 decide which technique to use to step over breakpoints depending on
1204 which of all-stop or non-stop mode is active --- displaced stepping
1205 in non-stop mode; hold-and-step in all-stop mode. */
1207 static const char *can_use_displaced_stepping
=
1208 can_use_displaced_stepping_auto
;
1211 show_can_use_displaced_stepping (struct ui_file
*file
, int from_tty
,
1212 struct cmd_list_element
*c
,
1215 if (can_use_displaced_stepping
== can_use_displaced_stepping_auto
)
1216 fprintf_filtered (file
,
1217 _("Debugger's willingness to use displaced stepping "
1218 "to step over breakpoints is %s (currently %s).\n"),
1219 value
, non_stop
? "on" : "off");
1221 fprintf_filtered (file
,
1222 _("Debugger's willingness to use displaced stepping "
1223 "to step over breakpoints is %s.\n"), value
);
1226 /* Return non-zero if displaced stepping can/should be used to step
1227 over breakpoints. */
1230 use_displaced_stepping (struct gdbarch
*gdbarch
)
1232 return (((can_use_displaced_stepping
== can_use_displaced_stepping_auto
1234 || can_use_displaced_stepping
== can_use_displaced_stepping_on
)
1235 && gdbarch_displaced_step_copy_insn_p (gdbarch
)
1236 && !RECORD_IS_USED
);
1239 /* Clean out any stray displaced stepping state. */
1241 displaced_step_clear (struct displaced_step_inferior_state
*displaced
)
1243 /* Indicate that there is no cleanup pending. */
1244 displaced
->step_ptid
= null_ptid
;
1246 if (displaced
->step_closure
)
1248 gdbarch_displaced_step_free_closure (displaced
->step_gdbarch
,
1249 displaced
->step_closure
);
1250 displaced
->step_closure
= NULL
;
1255 displaced_step_clear_cleanup (void *arg
)
1257 struct displaced_step_inferior_state
*state
= arg
;
1259 displaced_step_clear (state
);
1262 /* Dump LEN bytes at BUF in hex to FILE, followed by a newline. */
1264 displaced_step_dump_bytes (struct ui_file
*file
,
1265 const gdb_byte
*buf
,
1270 for (i
= 0; i
< len
; i
++)
1271 fprintf_unfiltered (file
, "%02x ", buf
[i
]);
1272 fputs_unfiltered ("\n", file
);
1275 /* Prepare to single-step, using displaced stepping.
1277 Note that we cannot use displaced stepping when we have a signal to
1278 deliver. If we have a signal to deliver and an instruction to step
1279 over, then after the step, there will be no indication from the
1280 target whether the thread entered a signal handler or ignored the
1281 signal and stepped over the instruction successfully --- both cases
1282 result in a simple SIGTRAP. In the first case we mustn't do a
1283 fixup, and in the second case we must --- but we can't tell which.
1284 Comments in the code for 'random signals' in handle_inferior_event
1285 explain how we handle this case instead.
1287 Returns 1 if preparing was successful -- this thread is going to be
1288 stepped now; or 0 if displaced stepping this thread got queued. */
1290 displaced_step_prepare (ptid_t ptid
)
1292 struct cleanup
*old_cleanups
, *ignore_cleanups
;
1293 struct regcache
*regcache
= get_thread_regcache (ptid
);
1294 struct gdbarch
*gdbarch
= get_regcache_arch (regcache
);
1295 CORE_ADDR original
, copy
;
1297 struct displaced_step_closure
*closure
;
1298 struct displaced_step_inferior_state
*displaced
;
1301 /* We should never reach this function if the architecture does not
1302 support displaced stepping. */
1303 gdb_assert (gdbarch_displaced_step_copy_insn_p (gdbarch
));
1305 /* We have to displaced step one thread at a time, as we only have
1306 access to a single scratch space per inferior. */
1308 displaced
= add_displaced_stepping_state (ptid_get_pid (ptid
));
1310 if (!ptid_equal (displaced
->step_ptid
, null_ptid
))
1312 /* Already waiting for a displaced step to finish. Defer this
1313 request and place in queue. */
1314 struct displaced_step_request
*req
, *new_req
;
1316 if (debug_displaced
)
1317 fprintf_unfiltered (gdb_stdlog
,
1318 "displaced: defering step of %s\n",
1319 target_pid_to_str (ptid
));
1321 new_req
= xmalloc (sizeof (*new_req
));
1322 new_req
->ptid
= ptid
;
1323 new_req
->next
= NULL
;
1325 if (displaced
->step_request_queue
)
1327 for (req
= displaced
->step_request_queue
;
1331 req
->next
= new_req
;
1334 displaced
->step_request_queue
= new_req
;
1340 if (debug_displaced
)
1341 fprintf_unfiltered (gdb_stdlog
,
1342 "displaced: stepping %s now\n",
1343 target_pid_to_str (ptid
));
1346 displaced_step_clear (displaced
);
1348 old_cleanups
= save_inferior_ptid ();
1349 inferior_ptid
= ptid
;
1351 original
= regcache_read_pc (regcache
);
1353 copy
= gdbarch_displaced_step_location (gdbarch
);
1354 len
= gdbarch_max_insn_length (gdbarch
);
1356 /* Save the original contents of the copy area. */
1357 displaced
->step_saved_copy
= xmalloc (len
);
1358 ignore_cleanups
= make_cleanup (free_current_contents
,
1359 &displaced
->step_saved_copy
);
1360 status
= target_read_memory (copy
, displaced
->step_saved_copy
, len
);
1362 throw_error (MEMORY_ERROR
,
1363 _("Error accessing memory address %s (%s) for "
1364 "displaced-stepping scratch space."),
1365 paddress (gdbarch
, copy
), safe_strerror (status
));
1366 if (debug_displaced
)
1368 fprintf_unfiltered (gdb_stdlog
, "displaced: saved %s: ",
1369 paddress (gdbarch
, copy
));
1370 displaced_step_dump_bytes (gdb_stdlog
,
1371 displaced
->step_saved_copy
,
1375 closure
= gdbarch_displaced_step_copy_insn (gdbarch
,
1376 original
, copy
, regcache
);
1378 /* We don't support the fully-simulated case at present. */
1379 gdb_assert (closure
);
1381 /* Save the information we need to fix things up if the step
1383 displaced
->step_ptid
= ptid
;
1384 displaced
->step_gdbarch
= gdbarch
;
1385 displaced
->step_closure
= closure
;
1386 displaced
->step_original
= original
;
1387 displaced
->step_copy
= copy
;
1389 make_cleanup (displaced_step_clear_cleanup
, displaced
);
1391 /* Resume execution at the copy. */
1392 regcache_write_pc (regcache
, copy
);
1394 discard_cleanups (ignore_cleanups
);
1396 do_cleanups (old_cleanups
);
1398 if (debug_displaced
)
1399 fprintf_unfiltered (gdb_stdlog
, "displaced: displaced pc to %s\n",
1400 paddress (gdbarch
, copy
));
1406 write_memory_ptid (ptid_t ptid
, CORE_ADDR memaddr
,
1407 const gdb_byte
*myaddr
, int len
)
1409 struct cleanup
*ptid_cleanup
= save_inferior_ptid ();
1411 inferior_ptid
= ptid
;
1412 write_memory (memaddr
, myaddr
, len
);
1413 do_cleanups (ptid_cleanup
);
1416 /* Restore the contents of the copy area for thread PTID. */
1419 displaced_step_restore (struct displaced_step_inferior_state
*displaced
,
1422 ULONGEST len
= gdbarch_max_insn_length (displaced
->step_gdbarch
);
1424 write_memory_ptid (ptid
, displaced
->step_copy
,
1425 displaced
->step_saved_copy
, len
);
1426 if (debug_displaced
)
1427 fprintf_unfiltered (gdb_stdlog
, "displaced: restored %s %s\n",
1428 target_pid_to_str (ptid
),
1429 paddress (displaced
->step_gdbarch
,
1430 displaced
->step_copy
));
1434 displaced_step_fixup (ptid_t event_ptid
, enum target_signal signal
)
1436 struct cleanup
*old_cleanups
;
1437 struct displaced_step_inferior_state
*displaced
1438 = get_displaced_stepping_state (ptid_get_pid (event_ptid
));
1440 /* Was any thread of this process doing a displaced step? */
1441 if (displaced
== NULL
)
1444 /* Was this event for the pid we displaced? */
1445 if (ptid_equal (displaced
->step_ptid
, null_ptid
)
1446 || ! ptid_equal (displaced
->step_ptid
, event_ptid
))
1449 old_cleanups
= make_cleanup (displaced_step_clear_cleanup
, displaced
);
1451 displaced_step_restore (displaced
, displaced
->step_ptid
);
1453 /* Did the instruction complete successfully? */
1454 if (signal
== TARGET_SIGNAL_TRAP
)
1456 /* Fix up the resulting state. */
1457 gdbarch_displaced_step_fixup (displaced
->step_gdbarch
,
1458 displaced
->step_closure
,
1459 displaced
->step_original
,
1460 displaced
->step_copy
,
1461 get_thread_regcache (displaced
->step_ptid
));
1465 /* Since the instruction didn't complete, all we can do is
1467 struct regcache
*regcache
= get_thread_regcache (event_ptid
);
1468 CORE_ADDR pc
= regcache_read_pc (regcache
);
1470 pc
= displaced
->step_original
+ (pc
- displaced
->step_copy
);
1471 regcache_write_pc (regcache
, pc
);
1474 do_cleanups (old_cleanups
);
1476 displaced
->step_ptid
= null_ptid
;
1478 /* Are there any pending displaced stepping requests? If so, run
1479 one now. Leave the state object around, since we're likely to
1480 need it again soon. */
1481 while (displaced
->step_request_queue
)
1483 struct displaced_step_request
*head
;
1485 struct regcache
*regcache
;
1486 struct gdbarch
*gdbarch
;
1487 CORE_ADDR actual_pc
;
1488 struct address_space
*aspace
;
1490 head
= displaced
->step_request_queue
;
1492 displaced
->step_request_queue
= head
->next
;
1495 context_switch (ptid
);
1497 regcache
= get_thread_regcache (ptid
);
1498 actual_pc
= regcache_read_pc (regcache
);
1499 aspace
= get_regcache_aspace (regcache
);
1501 if (breakpoint_here_p (aspace
, actual_pc
))
1503 if (debug_displaced
)
1504 fprintf_unfiltered (gdb_stdlog
,
1505 "displaced: stepping queued %s now\n",
1506 target_pid_to_str (ptid
));
1508 displaced_step_prepare (ptid
);
1510 gdbarch
= get_regcache_arch (regcache
);
1512 if (debug_displaced
)
1514 CORE_ADDR actual_pc
= regcache_read_pc (regcache
);
1517 fprintf_unfiltered (gdb_stdlog
, "displaced: run %s: ",
1518 paddress (gdbarch
, actual_pc
));
1519 read_memory (actual_pc
, buf
, sizeof (buf
));
1520 displaced_step_dump_bytes (gdb_stdlog
, buf
, sizeof (buf
));
1523 if (gdbarch_displaced_step_hw_singlestep (gdbarch
,
1524 displaced
->step_closure
))
1525 target_resume (ptid
, 1, TARGET_SIGNAL_0
);
1527 target_resume (ptid
, 0, TARGET_SIGNAL_0
);
1529 /* Done, we're stepping a thread. */
1535 struct thread_info
*tp
= inferior_thread ();
1537 /* The breakpoint we were sitting under has since been
1539 tp
->control
.trap_expected
= 0;
1541 /* Go back to what we were trying to do. */
1542 step
= currently_stepping (tp
);
1544 if (debug_displaced
)
1545 fprintf_unfiltered (gdb_stdlog
,
1546 "breakpoint is gone %s: step(%d)\n",
1547 target_pid_to_str (tp
->ptid
), step
);
1549 target_resume (ptid
, step
, TARGET_SIGNAL_0
);
1550 tp
->suspend
.stop_signal
= TARGET_SIGNAL_0
;
1552 /* This request was discarded. See if there's any other
1553 thread waiting for its turn. */
1558 /* Update global variables holding ptids to hold NEW_PTID if they were
1559 holding OLD_PTID. */
1561 infrun_thread_ptid_changed (ptid_t old_ptid
, ptid_t new_ptid
)
1563 struct displaced_step_request
*it
;
1564 struct displaced_step_inferior_state
*displaced
;
1566 if (ptid_equal (inferior_ptid
, old_ptid
))
1567 inferior_ptid
= new_ptid
;
1569 if (ptid_equal (singlestep_ptid
, old_ptid
))
1570 singlestep_ptid
= new_ptid
;
1572 if (ptid_equal (deferred_step_ptid
, old_ptid
))
1573 deferred_step_ptid
= new_ptid
;
1575 for (displaced
= displaced_step_inferior_states
;
1577 displaced
= displaced
->next
)
1579 if (ptid_equal (displaced
->step_ptid
, old_ptid
))
1580 displaced
->step_ptid
= new_ptid
;
1582 for (it
= displaced
->step_request_queue
; it
; it
= it
->next
)
1583 if (ptid_equal (it
->ptid
, old_ptid
))
1584 it
->ptid
= new_ptid
;
1591 /* Things to clean up if we QUIT out of resume (). */
1593 resume_cleanups (void *ignore
)
1598 static const char schedlock_off
[] = "off";
1599 static const char schedlock_on
[] = "on";
1600 static const char schedlock_step
[] = "step";
1601 static const char *const scheduler_enums
[] = {
1607 static const char *scheduler_mode
= schedlock_off
;
1609 show_scheduler_mode (struct ui_file
*file
, int from_tty
,
1610 struct cmd_list_element
*c
, const char *value
)
1612 fprintf_filtered (file
,
1613 _("Mode for locking scheduler "
1614 "during execution is \"%s\".\n"),
1619 set_schedlock_func (char *args
, int from_tty
, struct cmd_list_element
*c
)
1621 if (!target_can_lock_scheduler
)
1623 scheduler_mode
= schedlock_off
;
1624 error (_("Target '%s' cannot support this command."), target_shortname
);
1628 /* True if execution commands resume all threads of all processes by
1629 default; otherwise, resume only threads of the current inferior
1631 int sched_multi
= 0;
1633 /* Try to setup for software single stepping over the specified location.
1634 Return 1 if target_resume() should use hardware single step.
1636 GDBARCH the current gdbarch.
1637 PC the location to step over. */
1640 maybe_software_singlestep (struct gdbarch
*gdbarch
, CORE_ADDR pc
)
1644 if (execution_direction
== EXEC_FORWARD
1645 && gdbarch_software_single_step_p (gdbarch
)
1646 && gdbarch_software_single_step (gdbarch
, get_current_frame ()))
1649 /* Do not pull these breakpoints until after a `wait' in
1650 `wait_for_inferior'. */
1651 singlestep_breakpoints_inserted_p
= 1;
1652 singlestep_ptid
= inferior_ptid
;
1658 /* Return a ptid representing the set of threads that we will proceed,
1659 in the perspective of the user/frontend. We may actually resume
1660 fewer threads at first, e.g., if a thread is stopped at a
1661 breakpoint that needs stepping-off, but that should not be visible
1662 to the user/frontend, and neither should the frontend/user be
1663 allowed to proceed any of the threads that happen to be stopped for
1664 internal run control handling, if a previous command wanted them
1668 user_visible_resume_ptid (int step
)
1670 /* By default, resume all threads of all processes. */
1671 ptid_t resume_ptid
= RESUME_ALL
;
1673 /* Maybe resume only all threads of the current process. */
1674 if (!sched_multi
&& target_supports_multi_process ())
1676 resume_ptid
= pid_to_ptid (ptid_get_pid (inferior_ptid
));
1679 /* Maybe resume a single thread after all. */
1682 /* With non-stop mode on, threads are always handled
1684 resume_ptid
= inferior_ptid
;
1686 else if ((scheduler_mode
== schedlock_on
)
1687 || (scheduler_mode
== schedlock_step
1688 && (step
|| singlestep_breakpoints_inserted_p
)))
1690 /* User-settable 'scheduler' mode requires solo thread resume. */
1691 resume_ptid
= inferior_ptid
;
1697 /* Resume the inferior, but allow a QUIT. This is useful if the user
1698 wants to interrupt some lengthy single-stepping operation
1699 (for child processes, the SIGINT goes to the inferior, and so
1700 we get a SIGINT random_signal, but for remote debugging and perhaps
1701 other targets, that's not true).
1703 STEP nonzero if we should step (zero to continue instead).
1704 SIG is the signal to give the inferior (zero for none). */
1706 resume (int step
, enum target_signal sig
)
1708 int should_resume
= 1;
1709 struct cleanup
*old_cleanups
= make_cleanup (resume_cleanups
, 0);
1710 struct regcache
*regcache
= get_current_regcache ();
1711 struct gdbarch
*gdbarch
= get_regcache_arch (regcache
);
1712 struct thread_info
*tp
= inferior_thread ();
1713 CORE_ADDR pc
= regcache_read_pc (regcache
);
1714 struct address_space
*aspace
= get_regcache_aspace (regcache
);
1718 if (current_inferior ()->waiting_for_vfork_done
)
1720 /* Don't try to single-step a vfork parent that is waiting for
1721 the child to get out of the shared memory region (by exec'ing
1722 or exiting). This is particularly important on software
1723 single-step archs, as the child process would trip on the
1724 software single step breakpoint inserted for the parent
1725 process. Since the parent will not actually execute any
1726 instruction until the child is out of the shared region (such
1727 are vfork's semantics), it is safe to simply continue it.
1728 Eventually, we'll see a TARGET_WAITKIND_VFORK_DONE event for
1729 the parent, and tell it to `keep_going', which automatically
1730 re-sets it stepping. */
1732 fprintf_unfiltered (gdb_stdlog
,
1733 "infrun: resume : clear step\n");
1738 fprintf_unfiltered (gdb_stdlog
,
1739 "infrun: resume (step=%d, signal=%d), "
1740 "trap_expected=%d, current thread [%s] at %s\n",
1741 step
, sig
, tp
->control
.trap_expected
,
1742 target_pid_to_str (inferior_ptid
),
1743 paddress (gdbarch
, pc
));
1745 /* Normally, by the time we reach `resume', the breakpoints are either
1746 removed or inserted, as appropriate. The exception is if we're sitting
1747 at a permanent breakpoint; we need to step over it, but permanent
1748 breakpoints can't be removed. So we have to test for it here. */
1749 if (breakpoint_here_p (aspace
, pc
) == permanent_breakpoint_here
)
1751 if (gdbarch_skip_permanent_breakpoint_p (gdbarch
))
1752 gdbarch_skip_permanent_breakpoint (gdbarch
, regcache
);
1755 The program is stopped at a permanent breakpoint, but GDB does not know\n\
1756 how to step past a permanent breakpoint on this architecture. Try using\n\
1757 a command like `return' or `jump' to continue execution."));
1760 /* If enabled, step over breakpoints by executing a copy of the
1761 instruction at a different address.
1763 We can't use displaced stepping when we have a signal to deliver;
1764 the comments for displaced_step_prepare explain why. The
1765 comments in the handle_inferior event for dealing with 'random
1766 signals' explain what we do instead.
1768 We can't use displaced stepping when we are waiting for vfork_done
1769 event, displaced stepping breaks the vfork child similarly as single
1770 step software breakpoint. */
1771 if (use_displaced_stepping (gdbarch
)
1772 && (tp
->control
.trap_expected
1773 || (step
&& gdbarch_software_single_step_p (gdbarch
)))
1774 && sig
== TARGET_SIGNAL_0
1775 && !current_inferior ()->waiting_for_vfork_done
)
1777 struct displaced_step_inferior_state
*displaced
;
1779 if (!displaced_step_prepare (inferior_ptid
))
1781 /* Got placed in displaced stepping queue. Will be resumed
1782 later when all the currently queued displaced stepping
1783 requests finish. The thread is not executing at this point,
1784 and the call to set_executing will be made later. But we
1785 need to call set_running here, since from frontend point of view,
1786 the thread is running. */
1787 set_running (inferior_ptid
, 1);
1788 discard_cleanups (old_cleanups
);
1792 displaced
= get_displaced_stepping_state (ptid_get_pid (inferior_ptid
));
1793 step
= gdbarch_displaced_step_hw_singlestep (gdbarch
,
1794 displaced
->step_closure
);
1797 /* Do we need to do it the hard way, w/temp breakpoints? */
1799 step
= maybe_software_singlestep (gdbarch
, pc
);
1801 /* Currently, our software single-step implementation leads to different
1802 results than hardware single-stepping in one situation: when stepping
1803 into delivering a signal which has an associated signal handler,
1804 hardware single-step will stop at the first instruction of the handler,
1805 while software single-step will simply skip execution of the handler.
1807 For now, this difference in behavior is accepted since there is no
1808 easy way to actually implement single-stepping into a signal handler
1809 without kernel support.
1811 However, there is one scenario where this difference leads to follow-on
1812 problems: if we're stepping off a breakpoint by removing all breakpoints
1813 and then single-stepping. In this case, the software single-step
1814 behavior means that even if there is a *breakpoint* in the signal
1815 handler, GDB still would not stop.
1817 Fortunately, we can at least fix this particular issue. We detect
1818 here the case where we are about to deliver a signal while software
1819 single-stepping with breakpoints removed. In this situation, we
1820 revert the decisions to remove all breakpoints and insert single-
1821 step breakpoints, and instead we install a step-resume breakpoint
1822 at the current address, deliver the signal without stepping, and
1823 once we arrive back at the step-resume breakpoint, actually step
1824 over the breakpoint we originally wanted to step over. */
1825 if (singlestep_breakpoints_inserted_p
1826 && tp
->control
.trap_expected
&& sig
!= TARGET_SIGNAL_0
)
1828 /* If we have nested signals or a pending signal is delivered
1829 immediately after a handler returns, might might already have
1830 a step-resume breakpoint set on the earlier handler. We cannot
1831 set another step-resume breakpoint; just continue on until the
1832 original breakpoint is hit. */
1833 if (tp
->control
.step_resume_breakpoint
== NULL
)
1835 insert_hp_step_resume_breakpoint_at_frame (get_current_frame ());
1836 tp
->step_after_step_resume_breakpoint
= 1;
1839 remove_single_step_breakpoints ();
1840 singlestep_breakpoints_inserted_p
= 0;
1842 insert_breakpoints ();
1843 tp
->control
.trap_expected
= 0;
1850 /* If STEP is set, it's a request to use hardware stepping
1851 facilities. But in that case, we should never
1852 use singlestep breakpoint. */
1853 gdb_assert (!(singlestep_breakpoints_inserted_p
&& step
));
1855 /* Decide the set of threads to ask the target to resume. Start
1856 by assuming everything will be resumed, than narrow the set
1857 by applying increasingly restricting conditions. */
1858 resume_ptid
= user_visible_resume_ptid (step
);
1860 /* Maybe resume a single thread after all. */
1861 if (singlestep_breakpoints_inserted_p
1862 && stepping_past_singlestep_breakpoint
)
1864 /* The situation here is as follows. In thread T1 we wanted to
1865 single-step. Lacking hardware single-stepping we've
1866 set breakpoint at the PC of the next instruction -- call it
1867 P. After resuming, we've hit that breakpoint in thread T2.
1868 Now we've removed original breakpoint, inserted breakpoint
1869 at P+1, and try to step to advance T2 past breakpoint.
1870 We need to step only T2, as if T1 is allowed to freely run,
1871 it can run past P, and if other threads are allowed to run,
1872 they can hit breakpoint at P+1, and nested hits of single-step
1873 breakpoints is not something we'd want -- that's complicated
1874 to support, and has no value. */
1875 resume_ptid
= inferior_ptid
;
1877 else if ((step
|| singlestep_breakpoints_inserted_p
)
1878 && tp
->control
.trap_expected
)
1880 /* We're allowing a thread to run past a breakpoint it has
1881 hit, by single-stepping the thread with the breakpoint
1882 removed. In which case, we need to single-step only this
1883 thread, and keep others stopped, as they can miss this
1884 breakpoint if allowed to run.
1886 The current code actually removes all breakpoints when
1887 doing this, not just the one being stepped over, so if we
1888 let other threads run, we can actually miss any
1889 breakpoint, not just the one at PC. */
1890 resume_ptid
= inferior_ptid
;
1893 if (gdbarch_cannot_step_breakpoint (gdbarch
))
1895 /* Most targets can step a breakpoint instruction, thus
1896 executing it normally. But if this one cannot, just
1897 continue and we will hit it anyway. */
1898 if (step
&& breakpoint_inserted_here_p (aspace
, pc
))
1903 && use_displaced_stepping (gdbarch
)
1904 && tp
->control
.trap_expected
)
1906 struct regcache
*resume_regcache
= get_thread_regcache (resume_ptid
);
1907 struct gdbarch
*resume_gdbarch
= get_regcache_arch (resume_regcache
);
1908 CORE_ADDR actual_pc
= regcache_read_pc (resume_regcache
);
1911 fprintf_unfiltered (gdb_stdlog
, "displaced: run %s: ",
1912 paddress (resume_gdbarch
, actual_pc
));
1913 read_memory (actual_pc
, buf
, sizeof (buf
));
1914 displaced_step_dump_bytes (gdb_stdlog
, buf
, sizeof (buf
));
1917 /* Install inferior's terminal modes. */
1918 target_terminal_inferior ();
1920 /* Avoid confusing the next resume, if the next stop/resume
1921 happens to apply to another thread. */
1922 tp
->suspend
.stop_signal
= TARGET_SIGNAL_0
;
1924 /* Advise target which signals may be handled silently. If we have
1925 removed breakpoints because we are stepping over one (which can
1926 happen only if we are not using displaced stepping), we need to
1927 receive all signals to avoid accidentally skipping a breakpoint
1928 during execution of a signal handler. */
1929 if ((step
|| singlestep_breakpoints_inserted_p
)
1930 && tp
->control
.trap_expected
1931 && !use_displaced_stepping (gdbarch
))
1932 target_pass_signals (0, NULL
);
1934 target_pass_signals ((int) TARGET_SIGNAL_LAST
, signal_pass
);
1936 target_resume (resume_ptid
, step
, sig
);
1939 discard_cleanups (old_cleanups
);
1944 /* Clear out all variables saying what to do when inferior is continued.
1945 First do this, then set the ones you want, then call `proceed'. */
1948 clear_proceed_status_thread (struct thread_info
*tp
)
1951 fprintf_unfiltered (gdb_stdlog
,
1952 "infrun: clear_proceed_status_thread (%s)\n",
1953 target_pid_to_str (tp
->ptid
));
1955 tp
->control
.trap_expected
= 0;
1956 tp
->control
.step_range_start
= 0;
1957 tp
->control
.step_range_end
= 0;
1958 tp
->control
.step_frame_id
= null_frame_id
;
1959 tp
->control
.step_stack_frame_id
= null_frame_id
;
1960 tp
->control
.step_over_calls
= STEP_OVER_UNDEBUGGABLE
;
1961 tp
->stop_requested
= 0;
1963 tp
->control
.stop_step
= 0;
1965 tp
->control
.proceed_to_finish
= 0;
1967 /* Discard any remaining commands or status from previous stop. */
1968 bpstat_clear (&tp
->control
.stop_bpstat
);
1972 clear_proceed_status_callback (struct thread_info
*tp
, void *data
)
1974 if (is_exited (tp
->ptid
))
1977 clear_proceed_status_thread (tp
);
1982 clear_proceed_status (void)
1986 /* In all-stop mode, delete the per-thread status of all
1987 threads, even if inferior_ptid is null_ptid, there may be
1988 threads on the list. E.g., we may be launching a new
1989 process, while selecting the executable. */
1990 iterate_over_threads (clear_proceed_status_callback
, NULL
);
1993 if (!ptid_equal (inferior_ptid
, null_ptid
))
1995 struct inferior
*inferior
;
1999 /* If in non-stop mode, only delete the per-thread status of
2000 the current thread. */
2001 clear_proceed_status_thread (inferior_thread ());
2004 inferior
= current_inferior ();
2005 inferior
->control
.stop_soon
= NO_STOP_QUIETLY
;
2008 stop_after_trap
= 0;
2010 observer_notify_about_to_proceed ();
2014 regcache_xfree (stop_registers
);
2015 stop_registers
= NULL
;
2019 /* Check the current thread against the thread that reported the most recent
2020 event. If a step-over is required return TRUE and set the current thread
2021 to the old thread. Otherwise return FALSE.
2023 This should be suitable for any targets that support threads. */
2026 prepare_to_proceed (int step
)
2029 struct target_waitstatus wait_status
;
2030 int schedlock_enabled
;
2032 /* With non-stop mode on, threads are always handled individually. */
2033 gdb_assert (! non_stop
);
2035 /* Get the last target status returned by target_wait(). */
2036 get_last_target_status (&wait_ptid
, &wait_status
);
2038 /* Make sure we were stopped at a breakpoint. */
2039 if (wait_status
.kind
!= TARGET_WAITKIND_STOPPED
2040 || (wait_status
.value
.sig
!= TARGET_SIGNAL_TRAP
2041 && wait_status
.value
.sig
!= TARGET_SIGNAL_ILL
2042 && wait_status
.value
.sig
!= TARGET_SIGNAL_SEGV
2043 && wait_status
.value
.sig
!= TARGET_SIGNAL_EMT
))
2048 schedlock_enabled
= (scheduler_mode
== schedlock_on
2049 || (scheduler_mode
== schedlock_step
2052 /* Don't switch over to WAIT_PTID if scheduler locking is on. */
2053 if (schedlock_enabled
)
2056 /* Don't switch over if we're about to resume some other process
2057 other than WAIT_PTID's, and schedule-multiple is off. */
2059 && ptid_get_pid (wait_ptid
) != ptid_get_pid (inferior_ptid
))
2062 /* Switched over from WAIT_PID. */
2063 if (!ptid_equal (wait_ptid
, minus_one_ptid
)
2064 && !ptid_equal (inferior_ptid
, wait_ptid
))
2066 struct regcache
*regcache
= get_thread_regcache (wait_ptid
);
2068 if (breakpoint_here_p (get_regcache_aspace (regcache
),
2069 regcache_read_pc (regcache
)))
2071 /* If stepping, remember current thread to switch back to. */
2073 deferred_step_ptid
= inferior_ptid
;
2075 /* Switch back to WAIT_PID thread. */
2076 switch_to_thread (wait_ptid
);
2079 fprintf_unfiltered (gdb_stdlog
,
2080 "infrun: prepare_to_proceed (step=%d), "
2081 "switched to [%s]\n",
2082 step
, target_pid_to_str (inferior_ptid
));
2084 /* We return 1 to indicate that there is a breakpoint here,
2085 so we need to step over it before continuing to avoid
2086 hitting it straight away. */
2094 /* Basic routine for continuing the program in various fashions.
2096 ADDR is the address to resume at, or -1 for resume where stopped.
2097 SIGGNAL is the signal to give it, or 0 for none,
2098 or -1 for act according to how it stopped.
2099 STEP is nonzero if should trap after one instruction.
2100 -1 means return after that and print nothing.
2101 You should probably set various step_... variables
2102 before calling here, if you are stepping.
2104 You should call clear_proceed_status before calling proceed. */
2107 proceed (CORE_ADDR addr
, enum target_signal siggnal
, int step
)
2109 struct regcache
*regcache
;
2110 struct gdbarch
*gdbarch
;
2111 struct thread_info
*tp
;
2113 struct address_space
*aspace
;
2116 /* If we're stopped at a fork/vfork, follow the branch set by the
2117 "set follow-fork-mode" command; otherwise, we'll just proceed
2118 resuming the current thread. */
2119 if (!follow_fork ())
2121 /* The target for some reason decided not to resume. */
2123 if (target_can_async_p ())
2124 inferior_event_handler (INF_EXEC_COMPLETE
, NULL
);
2128 /* We'll update this if & when we switch to a new thread. */
2129 previous_inferior_ptid
= inferior_ptid
;
2131 regcache
= get_current_regcache ();
2132 gdbarch
= get_regcache_arch (regcache
);
2133 aspace
= get_regcache_aspace (regcache
);
2134 pc
= regcache_read_pc (regcache
);
2137 step_start_function
= find_pc_function (pc
);
2139 stop_after_trap
= 1;
2141 if (addr
== (CORE_ADDR
) -1)
2143 if (pc
== stop_pc
&& breakpoint_here_p (aspace
, pc
)
2144 && execution_direction
!= EXEC_REVERSE
)
2145 /* There is a breakpoint at the address we will resume at,
2146 step one instruction before inserting breakpoints so that
2147 we do not stop right away (and report a second hit at this
2150 Note, we don't do this in reverse, because we won't
2151 actually be executing the breakpoint insn anyway.
2152 We'll be (un-)executing the previous instruction. */
2155 else if (gdbarch_single_step_through_delay_p (gdbarch
)
2156 && gdbarch_single_step_through_delay (gdbarch
,
2157 get_current_frame ()))
2158 /* We stepped onto an instruction that needs to be stepped
2159 again before re-inserting the breakpoint, do so. */
2164 regcache_write_pc (regcache
, addr
);
2168 fprintf_unfiltered (gdb_stdlog
,
2169 "infrun: proceed (addr=%s, signal=%d, step=%d)\n",
2170 paddress (gdbarch
, addr
), siggnal
, step
);
2173 /* In non-stop, each thread is handled individually. The context
2174 must already be set to the right thread here. */
2178 /* In a multi-threaded task we may select another thread and
2179 then continue or step.
2181 But if the old thread was stopped at a breakpoint, it will
2182 immediately cause another breakpoint stop without any
2183 execution (i.e. it will report a breakpoint hit incorrectly).
2184 So we must step over it first.
2186 prepare_to_proceed checks the current thread against the
2187 thread that reported the most recent event. If a step-over
2188 is required it returns TRUE and sets the current thread to
2190 if (prepare_to_proceed (step
))
2194 /* prepare_to_proceed may change the current thread. */
2195 tp
= inferior_thread ();
2199 tp
->control
.trap_expected
= 1;
2200 /* If displaced stepping is enabled, we can step over the
2201 breakpoint without hitting it, so leave all breakpoints
2202 inserted. Otherwise we need to disable all breakpoints, step
2203 one instruction, and then re-add them when that step is
2205 if (!use_displaced_stepping (gdbarch
))
2206 remove_breakpoints ();
2209 /* We can insert breakpoints if we're not trying to step over one,
2210 or if we are stepping over one but we're using displaced stepping
2212 if (! tp
->control
.trap_expected
|| use_displaced_stepping (gdbarch
))
2213 insert_breakpoints ();
2217 /* Pass the last stop signal to the thread we're resuming,
2218 irrespective of whether the current thread is the thread that
2219 got the last event or not. This was historically GDB's
2220 behaviour before keeping a stop_signal per thread. */
2222 struct thread_info
*last_thread
;
2224 struct target_waitstatus last_status
;
2226 get_last_target_status (&last_ptid
, &last_status
);
2227 if (!ptid_equal (inferior_ptid
, last_ptid
)
2228 && !ptid_equal (last_ptid
, null_ptid
)
2229 && !ptid_equal (last_ptid
, minus_one_ptid
))
2231 last_thread
= find_thread_ptid (last_ptid
);
2234 tp
->suspend
.stop_signal
= last_thread
->suspend
.stop_signal
;
2235 last_thread
->suspend
.stop_signal
= TARGET_SIGNAL_0
;
2240 if (siggnal
!= TARGET_SIGNAL_DEFAULT
)
2241 tp
->suspend
.stop_signal
= siggnal
;
2242 /* If this signal should not be seen by program,
2243 give it zero. Used for debugging signals. */
2244 else if (!signal_program
[tp
->suspend
.stop_signal
])
2245 tp
->suspend
.stop_signal
= TARGET_SIGNAL_0
;
2247 annotate_starting ();
2249 /* Make sure that output from GDB appears before output from the
2251 gdb_flush (gdb_stdout
);
2253 /* Refresh prev_pc value just prior to resuming. This used to be
2254 done in stop_stepping, however, setting prev_pc there did not handle
2255 scenarios such as inferior function calls or returning from
2256 a function via the return command. In those cases, the prev_pc
2257 value was not set properly for subsequent commands. The prev_pc value
2258 is used to initialize the starting line number in the ecs. With an
2259 invalid value, the gdb next command ends up stopping at the position
2260 represented by the next line table entry past our start position.
2261 On platforms that generate one line table entry per line, this
2262 is not a problem. However, on the ia64, the compiler generates
2263 extraneous line table entries that do not increase the line number.
2264 When we issue the gdb next command on the ia64 after an inferior call
2265 or a return command, we often end up a few instructions forward, still
2266 within the original line we started.
2268 An attempt was made to refresh the prev_pc at the same time the
2269 execution_control_state is initialized (for instance, just before
2270 waiting for an inferior event). But this approach did not work
2271 because of platforms that use ptrace, where the pc register cannot
2272 be read unless the inferior is stopped. At that point, we are not
2273 guaranteed the inferior is stopped and so the regcache_read_pc() call
2274 can fail. Setting the prev_pc value here ensures the value is updated
2275 correctly when the inferior is stopped. */
2276 tp
->prev_pc
= regcache_read_pc (get_current_regcache ());
2278 /* Fill in with reasonable starting values. */
2279 init_thread_stepping_state (tp
);
2281 /* Reset to normal state. */
2282 init_infwait_state ();
2284 /* Resume inferior. */
2285 resume (oneproc
|| step
|| bpstat_should_step (), tp
->suspend
.stop_signal
);
2287 /* Wait for it to stop (if not standalone)
2288 and in any case decode why it stopped, and act accordingly. */
2289 /* Do this only if we are not using the event loop, or if the target
2290 does not support asynchronous execution. */
2291 if (!target_can_async_p ())
2293 wait_for_inferior ();
2299 /* Start remote-debugging of a machine over a serial link. */
2302 start_remote (int from_tty
)
2304 struct inferior
*inferior
;
2306 inferior
= current_inferior ();
2307 inferior
->control
.stop_soon
= STOP_QUIETLY_REMOTE
;
2309 /* Always go on waiting for the target, regardless of the mode. */
2310 /* FIXME: cagney/1999-09-23: At present it isn't possible to
2311 indicate to wait_for_inferior that a target should timeout if
2312 nothing is returned (instead of just blocking). Because of this,
2313 targets expecting an immediate response need to, internally, set
2314 things up so that the target_wait() is forced to eventually
2316 /* FIXME: cagney/1999-09-24: It isn't possible for target_open() to
2317 differentiate to its caller what the state of the target is after
2318 the initial open has been performed. Here we're assuming that
2319 the target has stopped. It should be possible to eventually have
2320 target_open() return to the caller an indication that the target
2321 is currently running and GDB state should be set to the same as
2322 for an async run. */
2323 wait_for_inferior ();
2325 /* Now that the inferior has stopped, do any bookkeeping like
2326 loading shared libraries. We want to do this before normal_stop,
2327 so that the displayed frame is up to date. */
2328 post_create_inferior (¤t_target
, from_tty
);
2333 /* Initialize static vars when a new inferior begins. */
2336 init_wait_for_inferior (void)
2338 /* These are meaningless until the first time through wait_for_inferior. */
2340 breakpoint_init_inferior (inf_starting
);
2342 clear_proceed_status ();
2344 stepping_past_singlestep_breakpoint
= 0;
2345 deferred_step_ptid
= null_ptid
;
2347 target_last_wait_ptid
= minus_one_ptid
;
2349 previous_inferior_ptid
= inferior_ptid
;
2350 init_infwait_state ();
2352 /* Discard any skipped inlined frames. */
2353 clear_inline_frame_state (minus_one_ptid
);
2357 /* This enum encodes possible reasons for doing a target_wait, so that
2358 wfi can call target_wait in one place. (Ultimately the call will be
2359 moved out of the infinite loop entirely.) */
2363 infwait_normal_state
,
2364 infwait_thread_hop_state
,
2365 infwait_step_watch_state
,
2366 infwait_nonstep_watch_state
2369 /* The PTID we'll do a target_wait on.*/
2372 /* Current inferior wait state. */
2373 enum infwait_states infwait_state
;
2375 /* Data to be passed around while handling an event. This data is
2376 discarded between events. */
2377 struct execution_control_state
2380 /* The thread that got the event, if this was a thread event; NULL
2382 struct thread_info
*event_thread
;
2384 struct target_waitstatus ws
;
2386 int stop_func_filled_in
;
2387 CORE_ADDR stop_func_start
;
2388 CORE_ADDR stop_func_end
;
2389 const char *stop_func_name
;
2390 int new_thread_event
;
2394 static void handle_inferior_event (struct execution_control_state
*ecs
);
2396 static void handle_step_into_function (struct gdbarch
*gdbarch
,
2397 struct execution_control_state
*ecs
);
2398 static void handle_step_into_function_backward (struct gdbarch
*gdbarch
,
2399 struct execution_control_state
*ecs
);
2400 static void check_exception_resume (struct execution_control_state
*,
2401 struct frame_info
*, struct symbol
*);
2403 static void stop_stepping (struct execution_control_state
*ecs
);
2404 static void prepare_to_wait (struct execution_control_state
*ecs
);
2405 static void keep_going (struct execution_control_state
*ecs
);
2407 /* Callback for iterate over threads. If the thread is stopped, but
2408 the user/frontend doesn't know about that yet, go through
2409 normal_stop, as if the thread had just stopped now. ARG points at
2410 a ptid. If PTID is MINUS_ONE_PTID, applies to all threads. If
2411 ptid_is_pid(PTID) is true, applies to all threads of the process
2412 pointed at by PTID. Otherwise, apply only to the thread pointed by
2416 infrun_thread_stop_requested_callback (struct thread_info
*info
, void *arg
)
2418 ptid_t ptid
= * (ptid_t
*) arg
;
2420 if ((ptid_equal (info
->ptid
, ptid
)
2421 || ptid_equal (minus_one_ptid
, ptid
)
2422 || (ptid_is_pid (ptid
)
2423 && ptid_get_pid (ptid
) == ptid_get_pid (info
->ptid
)))
2424 && is_running (info
->ptid
)
2425 && !is_executing (info
->ptid
))
2427 struct cleanup
*old_chain
;
2428 struct execution_control_state ecss
;
2429 struct execution_control_state
*ecs
= &ecss
;
2431 memset (ecs
, 0, sizeof (*ecs
));
2433 old_chain
= make_cleanup_restore_current_thread ();
2435 switch_to_thread (info
->ptid
);
2437 /* Go through handle_inferior_event/normal_stop, so we always
2438 have consistent output as if the stop event had been
2440 ecs
->ptid
= info
->ptid
;
2441 ecs
->event_thread
= find_thread_ptid (info
->ptid
);
2442 ecs
->ws
.kind
= TARGET_WAITKIND_STOPPED
;
2443 ecs
->ws
.value
.sig
= TARGET_SIGNAL_0
;
2445 handle_inferior_event (ecs
);
2447 if (!ecs
->wait_some_more
)
2449 struct thread_info
*tp
;
2453 /* Finish off the continuations. */
2454 tp
= inferior_thread ();
2455 do_all_intermediate_continuations_thread (tp
, 1);
2456 do_all_continuations_thread (tp
, 1);
2459 do_cleanups (old_chain
);
2465 /* This function is attached as a "thread_stop_requested" observer.
2466 Cleanup local state that assumed the PTID was to be resumed, and
2467 report the stop to the frontend. */
2470 infrun_thread_stop_requested (ptid_t ptid
)
2472 struct displaced_step_inferior_state
*displaced
;
2474 /* PTID was requested to stop. Remove it from the displaced
2475 stepping queue, so we don't try to resume it automatically. */
2477 for (displaced
= displaced_step_inferior_states
;
2479 displaced
= displaced
->next
)
2481 struct displaced_step_request
*it
, **prev_next_p
;
2483 it
= displaced
->step_request_queue
;
2484 prev_next_p
= &displaced
->step_request_queue
;
2487 if (ptid_match (it
->ptid
, ptid
))
2489 *prev_next_p
= it
->next
;
2495 prev_next_p
= &it
->next
;
2502 iterate_over_threads (infrun_thread_stop_requested_callback
, &ptid
);
2506 infrun_thread_thread_exit (struct thread_info
*tp
, int silent
)
2508 if (ptid_equal (target_last_wait_ptid
, tp
->ptid
))
2509 nullify_last_target_wait_ptid ();
2512 /* Callback for iterate_over_threads. */
2515 delete_step_resume_breakpoint_callback (struct thread_info
*info
, void *data
)
2517 if (is_exited (info
->ptid
))
2520 delete_step_resume_breakpoint (info
);
2521 delete_exception_resume_breakpoint (info
);
2525 /* In all-stop, delete the step resume breakpoint of any thread that
2526 had one. In non-stop, delete the step resume breakpoint of the
2527 thread that just stopped. */
2530 delete_step_thread_step_resume_breakpoint (void)
2532 if (!target_has_execution
2533 || ptid_equal (inferior_ptid
, null_ptid
))
2534 /* If the inferior has exited, we have already deleted the step
2535 resume breakpoints out of GDB's lists. */
2540 /* If in non-stop mode, only delete the step-resume or
2541 longjmp-resume breakpoint of the thread that just stopped
2543 struct thread_info
*tp
= inferior_thread ();
2545 delete_step_resume_breakpoint (tp
);
2546 delete_exception_resume_breakpoint (tp
);
2549 /* In all-stop mode, delete all step-resume and longjmp-resume
2550 breakpoints of any thread that had them. */
2551 iterate_over_threads (delete_step_resume_breakpoint_callback
, NULL
);
2554 /* A cleanup wrapper. */
2557 delete_step_thread_step_resume_breakpoint_cleanup (void *arg
)
2559 delete_step_thread_step_resume_breakpoint ();
2562 /* Pretty print the results of target_wait, for debugging purposes. */
2565 print_target_wait_results (ptid_t waiton_ptid
, ptid_t result_ptid
,
2566 const struct target_waitstatus
*ws
)
2568 char *status_string
= target_waitstatus_to_string (ws
);
2569 struct ui_file
*tmp_stream
= mem_fileopen ();
2572 /* The text is split over several lines because it was getting too long.
2573 Call fprintf_unfiltered (gdb_stdlog) once so that the text is still
2574 output as a unit; we want only one timestamp printed if debug_timestamp
2577 fprintf_unfiltered (tmp_stream
,
2578 "infrun: target_wait (%d", PIDGET (waiton_ptid
));
2579 if (PIDGET (waiton_ptid
) != -1)
2580 fprintf_unfiltered (tmp_stream
,
2581 " [%s]", target_pid_to_str (waiton_ptid
));
2582 fprintf_unfiltered (tmp_stream
, ", status) =\n");
2583 fprintf_unfiltered (tmp_stream
,
2584 "infrun: %d [%s],\n",
2585 PIDGET (result_ptid
), target_pid_to_str (result_ptid
));
2586 fprintf_unfiltered (tmp_stream
,
2590 text
= ui_file_xstrdup (tmp_stream
, NULL
);
2592 /* This uses %s in part to handle %'s in the text, but also to avoid
2593 a gcc error: the format attribute requires a string literal. */
2594 fprintf_unfiltered (gdb_stdlog
, "%s", text
);
2596 xfree (status_string
);
2598 ui_file_delete (tmp_stream
);
2601 /* Prepare and stabilize the inferior for detaching it. E.g.,
2602 detaching while a thread is displaced stepping is a recipe for
2603 crashing it, as nothing would readjust the PC out of the scratch
2607 prepare_for_detach (void)
2609 struct inferior
*inf
= current_inferior ();
2610 ptid_t pid_ptid
= pid_to_ptid (inf
->pid
);
2611 struct cleanup
*old_chain_1
;
2612 struct displaced_step_inferior_state
*displaced
;
2614 displaced
= get_displaced_stepping_state (inf
->pid
);
2616 /* Is any thread of this process displaced stepping? If not,
2617 there's nothing else to do. */
2618 if (displaced
== NULL
|| ptid_equal (displaced
->step_ptid
, null_ptid
))
2622 fprintf_unfiltered (gdb_stdlog
,
2623 "displaced-stepping in-process while detaching");
2625 old_chain_1
= make_cleanup_restore_integer (&inf
->detaching
);
2628 while (!ptid_equal (displaced
->step_ptid
, null_ptid
))
2630 struct cleanup
*old_chain_2
;
2631 struct execution_control_state ecss
;
2632 struct execution_control_state
*ecs
;
2635 memset (ecs
, 0, sizeof (*ecs
));
2637 overlay_cache_invalid
= 1;
2639 if (deprecated_target_wait_hook
)
2640 ecs
->ptid
= deprecated_target_wait_hook (pid_ptid
, &ecs
->ws
, 0);
2642 ecs
->ptid
= target_wait (pid_ptid
, &ecs
->ws
, 0);
2645 print_target_wait_results (pid_ptid
, ecs
->ptid
, &ecs
->ws
);
2647 /* If an error happens while handling the event, propagate GDB's
2648 knowledge of the executing state to the frontend/user running
2650 old_chain_2
= make_cleanup (finish_thread_state_cleanup
,
2653 /* In non-stop mode, each thread is handled individually.
2654 Switch early, so the global state is set correctly for this
2657 && ecs
->ws
.kind
!= TARGET_WAITKIND_EXITED
2658 && ecs
->ws
.kind
!= TARGET_WAITKIND_SIGNALLED
)
2659 context_switch (ecs
->ptid
);
2661 /* Now figure out what to do with the result of the result. */
2662 handle_inferior_event (ecs
);
2664 /* No error, don't finish the state yet. */
2665 discard_cleanups (old_chain_2
);
2667 /* Breakpoints and watchpoints are not installed on the target
2668 at this point, and signals are passed directly to the
2669 inferior, so this must mean the process is gone. */
2670 if (!ecs
->wait_some_more
)
2672 discard_cleanups (old_chain_1
);
2673 error (_("Program exited while detaching"));
2677 discard_cleanups (old_chain_1
);
2680 /* Wait for control to return from inferior to debugger.
2682 If inferior gets a signal, we may decide to start it up again
2683 instead of returning. That is why there is a loop in this function.
2684 When this function actually returns it means the inferior
2685 should be left stopped and GDB should read more commands. */
2688 wait_for_inferior (void)
2690 struct cleanup
*old_cleanups
;
2691 struct execution_control_state ecss
;
2692 struct execution_control_state
*ecs
;
2696 (gdb_stdlog
, "infrun: wait_for_inferior ()\n");
2699 make_cleanup (delete_step_thread_step_resume_breakpoint_cleanup
, NULL
);
2702 memset (ecs
, 0, sizeof (*ecs
));
2706 struct cleanup
*old_chain
;
2708 overlay_cache_invalid
= 1;
2710 if (deprecated_target_wait_hook
)
2711 ecs
->ptid
= deprecated_target_wait_hook (waiton_ptid
, &ecs
->ws
, 0);
2713 ecs
->ptid
= target_wait (waiton_ptid
, &ecs
->ws
, 0);
2716 print_target_wait_results (waiton_ptid
, ecs
->ptid
, &ecs
->ws
);
2718 /* If an error happens while handling the event, propagate GDB's
2719 knowledge of the executing state to the frontend/user running
2721 old_chain
= make_cleanup (finish_thread_state_cleanup
, &minus_one_ptid
);
2723 /* Now figure out what to do with the result of the result. */
2724 handle_inferior_event (ecs
);
2726 /* No error, don't finish the state yet. */
2727 discard_cleanups (old_chain
);
2729 if (!ecs
->wait_some_more
)
2733 do_cleanups (old_cleanups
);
2736 /* Asynchronous version of wait_for_inferior. It is called by the
2737 event loop whenever a change of state is detected on the file
2738 descriptor corresponding to the target. It can be called more than
2739 once to complete a single execution command. In such cases we need
2740 to keep the state in a global variable ECSS. If it is the last time
2741 that this function is called for a single execution command, then
2742 report to the user that the inferior has stopped, and do the
2743 necessary cleanups. */
2746 fetch_inferior_event (void *client_data
)
2748 struct execution_control_state ecss
;
2749 struct execution_control_state
*ecs
= &ecss
;
2750 struct cleanup
*old_chain
= make_cleanup (null_cleanup
, NULL
);
2751 struct cleanup
*ts_old_chain
;
2752 int was_sync
= sync_execution
;
2755 memset (ecs
, 0, sizeof (*ecs
));
2757 /* We're handling a live event, so make sure we're doing live
2758 debugging. If we're looking at traceframes while the target is
2759 running, we're going to need to get back to that mode after
2760 handling the event. */
2763 make_cleanup_restore_current_traceframe ();
2764 set_current_traceframe (-1);
2768 /* In non-stop mode, the user/frontend should not notice a thread
2769 switch due to internal events. Make sure we reverse to the
2770 user selected thread and frame after handling the event and
2771 running any breakpoint commands. */
2772 make_cleanup_restore_current_thread ();
2774 overlay_cache_invalid
= 1;
2776 make_cleanup_restore_integer (&execution_direction
);
2777 execution_direction
= target_execution_direction ();
2779 if (deprecated_target_wait_hook
)
2781 deprecated_target_wait_hook (waiton_ptid
, &ecs
->ws
, TARGET_WNOHANG
);
2783 ecs
->ptid
= target_wait (waiton_ptid
, &ecs
->ws
, TARGET_WNOHANG
);
2786 print_target_wait_results (waiton_ptid
, ecs
->ptid
, &ecs
->ws
);
2789 && ecs
->ws
.kind
!= TARGET_WAITKIND_IGNORE
2790 && ecs
->ws
.kind
!= TARGET_WAITKIND_NO_RESUMED
2791 && ecs
->ws
.kind
!= TARGET_WAITKIND_EXITED
2792 && ecs
->ws
.kind
!= TARGET_WAITKIND_SIGNALLED
)
2793 /* In non-stop mode, each thread is handled individually. Switch
2794 early, so the global state is set correctly for this
2796 context_switch (ecs
->ptid
);
2798 /* If an error happens while handling the event, propagate GDB's
2799 knowledge of the executing state to the frontend/user running
2802 ts_old_chain
= make_cleanup (finish_thread_state_cleanup
, &minus_one_ptid
);
2804 ts_old_chain
= make_cleanup (finish_thread_state_cleanup
, &ecs
->ptid
);
2806 /* Get executed before make_cleanup_restore_current_thread above to apply
2807 still for the thread which has thrown the exception. */
2808 make_bpstat_clear_actions_cleanup ();
2810 /* Now figure out what to do with the result of the result. */
2811 handle_inferior_event (ecs
);
2813 if (!ecs
->wait_some_more
)
2815 struct inferior
*inf
= find_inferior_pid (ptid_get_pid (ecs
->ptid
));
2817 delete_step_thread_step_resume_breakpoint ();
2819 /* We may not find an inferior if this was a process exit. */
2820 if (inf
== NULL
|| inf
->control
.stop_soon
== NO_STOP_QUIETLY
)
2823 if (target_has_execution
2824 && ecs
->ws
.kind
!= TARGET_WAITKIND_NO_RESUMED
2825 && ecs
->ws
.kind
!= TARGET_WAITKIND_EXITED
2826 && ecs
->ws
.kind
!= TARGET_WAITKIND_SIGNALLED
2827 && ecs
->event_thread
->step_multi
2828 && ecs
->event_thread
->control
.stop_step
)
2829 inferior_event_handler (INF_EXEC_CONTINUE
, NULL
);
2832 inferior_event_handler (INF_EXEC_COMPLETE
, NULL
);
2837 /* No error, don't finish the thread states yet. */
2838 discard_cleanups (ts_old_chain
);
2840 /* Revert thread and frame. */
2841 do_cleanups (old_chain
);
2843 /* If the inferior was in sync execution mode, and now isn't,
2844 restore the prompt (a synchronous execution command has finished,
2845 and we're ready for input). */
2846 if (interpreter_async
&& was_sync
&& !sync_execution
)
2847 display_gdb_prompt (0);
2851 && exec_done_display_p
2852 && (ptid_equal (inferior_ptid
, null_ptid
)
2853 || !is_running (inferior_ptid
)))
2854 printf_unfiltered (_("completed.\n"));
2857 /* Record the frame and location we're currently stepping through. */
2859 set_step_info (struct frame_info
*frame
, struct symtab_and_line sal
)
2861 struct thread_info
*tp
= inferior_thread ();
2863 tp
->control
.step_frame_id
= get_frame_id (frame
);
2864 tp
->control
.step_stack_frame_id
= get_stack_frame_id (frame
);
2866 tp
->current_symtab
= sal
.symtab
;
2867 tp
->current_line
= sal
.line
;
2870 /* Clear context switchable stepping state. */
2873 init_thread_stepping_state (struct thread_info
*tss
)
2875 tss
->stepping_over_breakpoint
= 0;
2876 tss
->step_after_step_resume_breakpoint
= 0;
2879 /* Return the cached copy of the last pid/waitstatus returned by
2880 target_wait()/deprecated_target_wait_hook(). The data is actually
2881 cached by handle_inferior_event(), which gets called immediately
2882 after target_wait()/deprecated_target_wait_hook(). */
2885 get_last_target_status (ptid_t
*ptidp
, struct target_waitstatus
*status
)
2887 *ptidp
= target_last_wait_ptid
;
2888 *status
= target_last_waitstatus
;
2892 nullify_last_target_wait_ptid (void)
2894 target_last_wait_ptid
= minus_one_ptid
;
2897 /* Switch thread contexts. */
2900 context_switch (ptid_t ptid
)
2902 if (debug_infrun
&& !ptid_equal (ptid
, inferior_ptid
))
2904 fprintf_unfiltered (gdb_stdlog
, "infrun: Switching context from %s ",
2905 target_pid_to_str (inferior_ptid
));
2906 fprintf_unfiltered (gdb_stdlog
, "to %s\n",
2907 target_pid_to_str (ptid
));
2910 switch_to_thread (ptid
);
2914 adjust_pc_after_break (struct execution_control_state
*ecs
)
2916 struct regcache
*regcache
;
2917 struct gdbarch
*gdbarch
;
2918 struct address_space
*aspace
;
2919 CORE_ADDR breakpoint_pc
;
2921 /* If we've hit a breakpoint, we'll normally be stopped with SIGTRAP. If
2922 we aren't, just return.
2924 We assume that waitkinds other than TARGET_WAITKIND_STOPPED are not
2925 affected by gdbarch_decr_pc_after_break. Other waitkinds which are
2926 implemented by software breakpoints should be handled through the normal
2929 NOTE drow/2004-01-31: On some targets, breakpoints may generate
2930 different signals (SIGILL or SIGEMT for instance), but it is less
2931 clear where the PC is pointing afterwards. It may not match
2932 gdbarch_decr_pc_after_break. I don't know any specific target that
2933 generates these signals at breakpoints (the code has been in GDB since at
2934 least 1992) so I can not guess how to handle them here.
2936 In earlier versions of GDB, a target with
2937 gdbarch_have_nonsteppable_watchpoint would have the PC after hitting a
2938 watchpoint affected by gdbarch_decr_pc_after_break. I haven't found any
2939 target with both of these set in GDB history, and it seems unlikely to be
2940 correct, so gdbarch_have_nonsteppable_watchpoint is not checked here. */
2942 if (ecs
->ws
.kind
!= TARGET_WAITKIND_STOPPED
)
2945 if (ecs
->ws
.value
.sig
!= TARGET_SIGNAL_TRAP
)
2948 /* In reverse execution, when a breakpoint is hit, the instruction
2949 under it has already been de-executed. The reported PC always
2950 points at the breakpoint address, so adjusting it further would
2951 be wrong. E.g., consider this case on a decr_pc_after_break == 1
2954 B1 0x08000000 : INSN1
2955 B2 0x08000001 : INSN2
2957 PC -> 0x08000003 : INSN4
2959 Say you're stopped at 0x08000003 as above. Reverse continuing
2960 from that point should hit B2 as below. Reading the PC when the
2961 SIGTRAP is reported should read 0x08000001 and INSN2 should have
2962 been de-executed already.
2964 B1 0x08000000 : INSN1
2965 B2 PC -> 0x08000001 : INSN2
2969 We can't apply the same logic as for forward execution, because
2970 we would wrongly adjust the PC to 0x08000000, since there's a
2971 breakpoint at PC - 1. We'd then report a hit on B1, although
2972 INSN1 hadn't been de-executed yet. Doing nothing is the correct
2974 if (execution_direction
== EXEC_REVERSE
)
2977 /* If this target does not decrement the PC after breakpoints, then
2978 we have nothing to do. */
2979 regcache
= get_thread_regcache (ecs
->ptid
);
2980 gdbarch
= get_regcache_arch (regcache
);
2981 if (gdbarch_decr_pc_after_break (gdbarch
) == 0)
2984 aspace
= get_regcache_aspace (regcache
);
2986 /* Find the location where (if we've hit a breakpoint) the
2987 breakpoint would be. */
2988 breakpoint_pc
= regcache_read_pc (regcache
)
2989 - gdbarch_decr_pc_after_break (gdbarch
);
2991 /* Check whether there actually is a software breakpoint inserted at
2994 If in non-stop mode, a race condition is possible where we've
2995 removed a breakpoint, but stop events for that breakpoint were
2996 already queued and arrive later. To suppress those spurious
2997 SIGTRAPs, we keep a list of such breakpoint locations for a bit,
2998 and retire them after a number of stop events are reported. */
2999 if (software_breakpoint_inserted_here_p (aspace
, breakpoint_pc
)
3000 || (non_stop
&& moribund_breakpoint_here_p (aspace
, breakpoint_pc
)))
3002 struct cleanup
*old_cleanups
= NULL
;
3005 old_cleanups
= record_gdb_operation_disable_set ();
3007 /* When using hardware single-step, a SIGTRAP is reported for both
3008 a completed single-step and a software breakpoint. Need to
3009 differentiate between the two, as the latter needs adjusting
3010 but the former does not.
3012 The SIGTRAP can be due to a completed hardware single-step only if
3013 - we didn't insert software single-step breakpoints
3014 - the thread to be examined is still the current thread
3015 - this thread is currently being stepped
3017 If any of these events did not occur, we must have stopped due
3018 to hitting a software breakpoint, and have to back up to the
3021 As a special case, we could have hardware single-stepped a
3022 software breakpoint. In this case (prev_pc == breakpoint_pc),
3023 we also need to back up to the breakpoint address. */
3025 if (singlestep_breakpoints_inserted_p
3026 || !ptid_equal (ecs
->ptid
, inferior_ptid
)
3027 || !currently_stepping (ecs
->event_thread
)
3028 || ecs
->event_thread
->prev_pc
== breakpoint_pc
)
3029 regcache_write_pc (regcache
, breakpoint_pc
);
3032 do_cleanups (old_cleanups
);
3037 init_infwait_state (void)
3039 waiton_ptid
= pid_to_ptid (-1);
3040 infwait_state
= infwait_normal_state
;
3044 error_is_running (void)
3046 error (_("Cannot execute this command while "
3047 "the selected thread is running."));
3051 ensure_not_running (void)
3053 if (is_running (inferior_ptid
))
3054 error_is_running ();
3058 stepped_in_from (struct frame_info
*frame
, struct frame_id step_frame_id
)
3060 for (frame
= get_prev_frame (frame
);
3062 frame
= get_prev_frame (frame
))
3064 if (frame_id_eq (get_frame_id (frame
), step_frame_id
))
3066 if (get_frame_type (frame
) != INLINE_FRAME
)
3073 /* Auxiliary function that handles syscall entry/return events.
3074 It returns 1 if the inferior should keep going (and GDB
3075 should ignore the event), or 0 if the event deserves to be
3079 handle_syscall_event (struct execution_control_state
*ecs
)
3081 struct regcache
*regcache
;
3082 struct gdbarch
*gdbarch
;
3085 if (!ptid_equal (ecs
->ptid
, inferior_ptid
))
3086 context_switch (ecs
->ptid
);
3088 regcache
= get_thread_regcache (ecs
->ptid
);
3089 gdbarch
= get_regcache_arch (regcache
);
3090 syscall_number
= ecs
->ws
.value
.syscall_number
;
3091 stop_pc
= regcache_read_pc (regcache
);
3093 if (catch_syscall_enabled () > 0
3094 && catching_syscall_number (syscall_number
) > 0)
3097 fprintf_unfiltered (gdb_stdlog
, "infrun: syscall number = '%d'\n",
3100 ecs
->event_thread
->control
.stop_bpstat
3101 = bpstat_stop_status (get_regcache_aspace (regcache
),
3102 stop_pc
, ecs
->ptid
, &ecs
->ws
);
3104 = !bpstat_explains_signal (ecs
->event_thread
->control
.stop_bpstat
);
3106 if (!ecs
->random_signal
)
3108 /* Catchpoint hit. */
3109 ecs
->event_thread
->suspend
.stop_signal
= TARGET_SIGNAL_TRAP
;
3114 /* If no catchpoint triggered for this, then keep going. */
3115 ecs
->event_thread
->suspend
.stop_signal
= TARGET_SIGNAL_0
;
3120 /* Clear the supplied execution_control_state's stop_func_* fields. */
3123 clear_stop_func (struct execution_control_state
*ecs
)
3125 ecs
->stop_func_filled_in
= 0;
3126 ecs
->stop_func_start
= 0;
3127 ecs
->stop_func_end
= 0;
3128 ecs
->stop_func_name
= NULL
;
3131 /* Lazily fill in the execution_control_state's stop_func_* fields. */
3134 fill_in_stop_func (struct gdbarch
*gdbarch
,
3135 struct execution_control_state
*ecs
)
3137 if (!ecs
->stop_func_filled_in
)
3139 /* Don't care about return value; stop_func_start and stop_func_name
3140 will both be 0 if it doesn't work. */
3141 find_pc_partial_function (stop_pc
, &ecs
->stop_func_name
,
3142 &ecs
->stop_func_start
, &ecs
->stop_func_end
);
3143 ecs
->stop_func_start
3144 += gdbarch_deprecated_function_start_offset (gdbarch
);
3146 ecs
->stop_func_filled_in
= 1;
3150 /* Given an execution control state that has been freshly filled in
3151 by an event from the inferior, figure out what it means and take
3152 appropriate action. */
3155 handle_inferior_event (struct execution_control_state
*ecs
)
3157 struct frame_info
*frame
;
3158 struct gdbarch
*gdbarch
;
3159 int stopped_by_watchpoint
;
3160 int stepped_after_stopped_by_watchpoint
= 0;
3161 struct symtab_and_line stop_pc_sal
;
3162 enum stop_kind stop_soon
;
3164 if (ecs
->ws
.kind
== TARGET_WAITKIND_IGNORE
)
3166 /* We had an event in the inferior, but we are not interested in
3167 handling it at this level. The lower layers have already
3168 done what needs to be done, if anything.
3170 One of the possible circumstances for this is when the
3171 inferior produces output for the console. The inferior has
3172 not stopped, and we are ignoring the event. Another possible
3173 circumstance is any event which the lower level knows will be
3174 reported multiple times without an intervening resume. */
3176 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_IGNORE\n");
3177 prepare_to_wait (ecs
);
3181 if (ecs
->ws
.kind
== TARGET_WAITKIND_NO_RESUMED
3182 && target_can_async_p () && !sync_execution
)
3184 /* There were no unwaited-for children left in the target, but,
3185 we're not synchronously waiting for events either. Just
3186 ignore. Otherwise, if we were running a synchronous
3187 execution command, we need to cancel it and give the user
3188 back the terminal. */
3190 fprintf_unfiltered (gdb_stdlog
,
3191 "infrun: TARGET_WAITKIND_NO_RESUMED (ignoring)\n");
3192 prepare_to_wait (ecs
);
3196 if (ecs
->ws
.kind
!= TARGET_WAITKIND_EXITED
3197 && ecs
->ws
.kind
!= TARGET_WAITKIND_SIGNALLED
3198 && ecs
->ws
.kind
!= TARGET_WAITKIND_NO_RESUMED
)
3200 struct inferior
*inf
= find_inferior_pid (ptid_get_pid (ecs
->ptid
));
3203 stop_soon
= inf
->control
.stop_soon
;
3206 stop_soon
= NO_STOP_QUIETLY
;
3208 /* Cache the last pid/waitstatus. */
3209 target_last_wait_ptid
= ecs
->ptid
;
3210 target_last_waitstatus
= ecs
->ws
;
3212 /* Always clear state belonging to the previous time we stopped. */
3213 stop_stack_dummy
= STOP_NONE
;
3215 if (ecs
->ws
.kind
== TARGET_WAITKIND_NO_RESUMED
)
3217 /* No unwaited-for children left. IOW, all resumed children
3220 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_NO_RESUMED\n");
3222 stop_print_frame
= 0;
3223 stop_stepping (ecs
);
3227 /* If it's a new process, add it to the thread database. */
3229 ecs
->new_thread_event
= (!ptid_equal (ecs
->ptid
, inferior_ptid
)
3230 && !ptid_equal (ecs
->ptid
, minus_one_ptid
)
3231 && !in_thread_list (ecs
->ptid
));
3233 if (ecs
->ws
.kind
!= TARGET_WAITKIND_EXITED
3234 && ecs
->ws
.kind
!= TARGET_WAITKIND_SIGNALLED
&& ecs
->new_thread_event
)
3235 add_thread (ecs
->ptid
);
3237 ecs
->event_thread
= find_thread_ptid (ecs
->ptid
);
3239 /* Dependent on valid ECS->EVENT_THREAD. */
3240 adjust_pc_after_break (ecs
);
3242 /* Dependent on the current PC value modified by adjust_pc_after_break. */
3243 reinit_frame_cache ();
3245 breakpoint_retire_moribund ();
3247 /* First, distinguish signals caused by the debugger from signals
3248 that have to do with the program's own actions. Note that
3249 breakpoint insns may cause SIGTRAP or SIGILL or SIGEMT, depending
3250 on the operating system version. Here we detect when a SIGILL or
3251 SIGEMT is really a breakpoint and change it to SIGTRAP. We do
3252 something similar for SIGSEGV, since a SIGSEGV will be generated
3253 when we're trying to execute a breakpoint instruction on a
3254 non-executable stack. This happens for call dummy breakpoints
3255 for architectures like SPARC that place call dummies on the
3257 if (ecs
->ws
.kind
== TARGET_WAITKIND_STOPPED
3258 && (ecs
->ws
.value
.sig
== TARGET_SIGNAL_ILL
3259 || ecs
->ws
.value
.sig
== TARGET_SIGNAL_SEGV
3260 || ecs
->ws
.value
.sig
== TARGET_SIGNAL_EMT
))
3262 struct regcache
*regcache
= get_thread_regcache (ecs
->ptid
);
3264 if (breakpoint_inserted_here_p (get_regcache_aspace (regcache
),
3265 regcache_read_pc (regcache
)))
3268 fprintf_unfiltered (gdb_stdlog
,
3269 "infrun: Treating signal as SIGTRAP\n");
3270 ecs
->ws
.value
.sig
= TARGET_SIGNAL_TRAP
;
3274 /* Mark the non-executing threads accordingly. In all-stop, all
3275 threads of all processes are stopped when we get any event
3276 reported. In non-stop mode, only the event thread stops. If
3277 we're handling a process exit in non-stop mode, there's nothing
3278 to do, as threads of the dead process are gone, and threads of
3279 any other process were left running. */
3281 set_executing (minus_one_ptid
, 0);
3282 else if (ecs
->ws
.kind
!= TARGET_WAITKIND_SIGNALLED
3283 && ecs
->ws
.kind
!= TARGET_WAITKIND_EXITED
)
3284 set_executing (ecs
->ptid
, 0);
3286 switch (infwait_state
)
3288 case infwait_thread_hop_state
:
3290 fprintf_unfiltered (gdb_stdlog
, "infrun: infwait_thread_hop_state\n");
3293 case infwait_normal_state
:
3295 fprintf_unfiltered (gdb_stdlog
, "infrun: infwait_normal_state\n");
3298 case infwait_step_watch_state
:
3300 fprintf_unfiltered (gdb_stdlog
,
3301 "infrun: infwait_step_watch_state\n");
3303 stepped_after_stopped_by_watchpoint
= 1;
3306 case infwait_nonstep_watch_state
:
3308 fprintf_unfiltered (gdb_stdlog
,
3309 "infrun: infwait_nonstep_watch_state\n");
3310 insert_breakpoints ();
3312 /* FIXME-maybe: is this cleaner than setting a flag? Does it
3313 handle things like signals arriving and other things happening
3314 in combination correctly? */
3315 stepped_after_stopped_by_watchpoint
= 1;
3319 internal_error (__FILE__
, __LINE__
, _("bad switch"));
3322 infwait_state
= infwait_normal_state
;
3323 waiton_ptid
= pid_to_ptid (-1);
3325 switch (ecs
->ws
.kind
)
3327 case TARGET_WAITKIND_LOADED
:
3329 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_LOADED\n");
3330 /* Ignore gracefully during startup of the inferior, as it might
3331 be the shell which has just loaded some objects, otherwise
3332 add the symbols for the newly loaded objects. Also ignore at
3333 the beginning of an attach or remote session; we will query
3334 the full list of libraries once the connection is
3336 if (stop_soon
== NO_STOP_QUIETLY
)
3338 struct regcache
*regcache
;
3340 if (!ptid_equal (ecs
->ptid
, inferior_ptid
))
3341 context_switch (ecs
->ptid
);
3342 regcache
= get_thread_regcache (ecs
->ptid
);
3344 handle_solib_event ();
3346 ecs
->event_thread
->control
.stop_bpstat
3347 = bpstat_stop_status (get_regcache_aspace (regcache
),
3348 stop_pc
, ecs
->ptid
, &ecs
->ws
);
3350 = !bpstat_explains_signal (ecs
->event_thread
->control
.stop_bpstat
);
3352 if (!ecs
->random_signal
)
3354 /* A catchpoint triggered. */
3355 ecs
->event_thread
->suspend
.stop_signal
= TARGET_SIGNAL_TRAP
;
3356 goto process_event_stop_test
;
3359 /* If requested, stop when the dynamic linker notifies
3360 gdb of events. This allows the user to get control
3361 and place breakpoints in initializer routines for
3362 dynamically loaded objects (among other things). */
3363 ecs
->event_thread
->suspend
.stop_signal
= TARGET_SIGNAL_0
;
3364 if (stop_on_solib_events
)
3366 /* Make sure we print "Stopped due to solib-event" in
3368 stop_print_frame
= 1;
3370 stop_stepping (ecs
);
3375 /* If we are skipping through a shell, or through shared library
3376 loading that we aren't interested in, resume the program. If
3377 we're running the program normally, also resume. But stop if
3378 we're attaching or setting up a remote connection. */
3379 if (stop_soon
== STOP_QUIETLY
|| stop_soon
== NO_STOP_QUIETLY
)
3381 /* Loading of shared libraries might have changed breakpoint
3382 addresses. Make sure new breakpoints are inserted. */
3383 if (stop_soon
== NO_STOP_QUIETLY
3384 && !breakpoints_always_inserted_mode ())
3385 insert_breakpoints ();
3386 resume (0, TARGET_SIGNAL_0
);
3387 prepare_to_wait (ecs
);
3393 case TARGET_WAITKIND_SPURIOUS
:
3395 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_SPURIOUS\n");
3396 resume (0, TARGET_SIGNAL_0
);
3397 prepare_to_wait (ecs
);
3400 case TARGET_WAITKIND_EXITED
:
3402 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_EXITED\n");
3403 inferior_ptid
= ecs
->ptid
;
3404 set_current_inferior (find_inferior_pid (ptid_get_pid (ecs
->ptid
)));
3405 set_current_program_space (current_inferior ()->pspace
);
3406 handle_vfork_child_exec_or_exit (0);
3407 target_terminal_ours (); /* Must do this before mourn anyway. */
3408 print_exited_reason (ecs
->ws
.value
.integer
);
3410 /* Record the exit code in the convenience variable $_exitcode, so
3411 that the user can inspect this again later. */
3412 set_internalvar_integer (lookup_internalvar ("_exitcode"),
3413 (LONGEST
) ecs
->ws
.value
.integer
);
3415 /* Also record this in the inferior itself. */
3416 current_inferior ()->has_exit_code
= 1;
3417 current_inferior ()->exit_code
= (LONGEST
) ecs
->ws
.value
.integer
;
3419 gdb_flush (gdb_stdout
);
3420 target_mourn_inferior ();
3421 singlestep_breakpoints_inserted_p
= 0;
3422 cancel_single_step_breakpoints ();
3423 stop_print_frame
= 0;
3424 stop_stepping (ecs
);
3427 case TARGET_WAITKIND_SIGNALLED
:
3429 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_SIGNALLED\n");
3430 inferior_ptid
= ecs
->ptid
;
3431 set_current_inferior (find_inferior_pid (ptid_get_pid (ecs
->ptid
)));
3432 set_current_program_space (current_inferior ()->pspace
);
3433 handle_vfork_child_exec_or_exit (0);
3434 stop_print_frame
= 0;
3435 target_terminal_ours (); /* Must do this before mourn anyway. */
3437 /* Note: By definition of TARGET_WAITKIND_SIGNALLED, we shouldn't
3438 reach here unless the inferior is dead. However, for years
3439 target_kill() was called here, which hints that fatal signals aren't
3440 really fatal on some systems. If that's true, then some changes
3442 target_mourn_inferior ();
3444 print_signal_exited_reason (ecs
->ws
.value
.sig
);
3445 singlestep_breakpoints_inserted_p
= 0;
3446 cancel_single_step_breakpoints ();
3447 stop_stepping (ecs
);
3450 /* The following are the only cases in which we keep going;
3451 the above cases end in a continue or goto. */
3452 case TARGET_WAITKIND_FORKED
:
3453 case TARGET_WAITKIND_VFORKED
:
3455 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_FORKED\n");
3457 /* Check whether the inferior is displaced stepping. */
3459 struct regcache
*regcache
= get_thread_regcache (ecs
->ptid
);
3460 struct gdbarch
*gdbarch
= get_regcache_arch (regcache
);
3461 struct displaced_step_inferior_state
*displaced
3462 = get_displaced_stepping_state (ptid_get_pid (ecs
->ptid
));
3464 /* If checking displaced stepping is supported, and thread
3465 ecs->ptid is displaced stepping. */
3466 if (displaced
&& ptid_equal (displaced
->step_ptid
, ecs
->ptid
))
3468 struct inferior
*parent_inf
3469 = find_inferior_pid (ptid_get_pid (ecs
->ptid
));
3470 struct regcache
*child_regcache
;
3471 CORE_ADDR parent_pc
;
3473 /* GDB has got TARGET_WAITKIND_FORKED or TARGET_WAITKIND_VFORKED,
3474 indicating that the displaced stepping of syscall instruction
3475 has been done. Perform cleanup for parent process here. Note
3476 that this operation also cleans up the child process for vfork,
3477 because their pages are shared. */
3478 displaced_step_fixup (ecs
->ptid
, TARGET_SIGNAL_TRAP
);
3480 if (ecs
->ws
.kind
== TARGET_WAITKIND_FORKED
)
3482 /* Restore scratch pad for child process. */
3483 displaced_step_restore (displaced
, ecs
->ws
.value
.related_pid
);
3486 /* Since the vfork/fork syscall instruction was executed in the scratchpad,
3487 the child's PC is also within the scratchpad. Set the child's PC
3488 to the parent's PC value, which has already been fixed up.
3489 FIXME: we use the parent's aspace here, although we're touching
3490 the child, because the child hasn't been added to the inferior
3491 list yet at this point. */
3494 = get_thread_arch_aspace_regcache (ecs
->ws
.value
.related_pid
,
3496 parent_inf
->aspace
);
3497 /* Read PC value of parent process. */
3498 parent_pc
= regcache_read_pc (regcache
);
3500 if (debug_displaced
)
3501 fprintf_unfiltered (gdb_stdlog
,
3502 "displaced: write child pc from %s to %s\n",
3504 regcache_read_pc (child_regcache
)),
3505 paddress (gdbarch
, parent_pc
));
3507 regcache_write_pc (child_regcache
, parent_pc
);
3511 if (!ptid_equal (ecs
->ptid
, inferior_ptid
))
3513 context_switch (ecs
->ptid
);
3514 reinit_frame_cache ();
3517 /* Immediately detach breakpoints from the child before there's
3518 any chance of letting the user delete breakpoints from the
3519 breakpoint lists. If we don't do this early, it's easy to
3520 leave left over traps in the child, vis: "break foo; catch
3521 fork; c; <fork>; del; c; <child calls foo>". We only follow
3522 the fork on the last `continue', and by that time the
3523 breakpoint at "foo" is long gone from the breakpoint table.
3524 If we vforked, then we don't need to unpatch here, since both
3525 parent and child are sharing the same memory pages; we'll
3526 need to unpatch at follow/detach time instead to be certain
3527 that new breakpoints added between catchpoint hit time and
3528 vfork follow are detached. */
3529 if (ecs
->ws
.kind
!= TARGET_WAITKIND_VFORKED
)
3531 int child_pid
= ptid_get_pid (ecs
->ws
.value
.related_pid
);
3533 /* This won't actually modify the breakpoint list, but will
3534 physically remove the breakpoints from the child. */
3535 detach_breakpoints (child_pid
);
3538 if (singlestep_breakpoints_inserted_p
)
3540 /* Pull the single step breakpoints out of the target. */
3541 remove_single_step_breakpoints ();
3542 singlestep_breakpoints_inserted_p
= 0;
3545 /* In case the event is caught by a catchpoint, remember that
3546 the event is to be followed at the next resume of the thread,
3547 and not immediately. */
3548 ecs
->event_thread
->pending_follow
= ecs
->ws
;
3550 stop_pc
= regcache_read_pc (get_thread_regcache (ecs
->ptid
));
3552 ecs
->event_thread
->control
.stop_bpstat
3553 = bpstat_stop_status (get_regcache_aspace (get_current_regcache ()),
3554 stop_pc
, ecs
->ptid
, &ecs
->ws
);
3556 /* Note that we're interested in knowing the bpstat actually
3557 causes a stop, not just if it may explain the signal.
3558 Software watchpoints, for example, always appear in the
3561 = !bpstat_causes_stop (ecs
->event_thread
->control
.stop_bpstat
);
3563 /* If no catchpoint triggered for this, then keep going. */
3564 if (ecs
->random_signal
)
3570 = (follow_fork_mode_string
== follow_fork_mode_child
);
3572 ecs
->event_thread
->suspend
.stop_signal
= TARGET_SIGNAL_0
;
3574 should_resume
= follow_fork ();
3577 child
= ecs
->ws
.value
.related_pid
;
3579 /* In non-stop mode, also resume the other branch. */
3580 if (non_stop
&& !detach_fork
)
3583 switch_to_thread (parent
);
3585 switch_to_thread (child
);
3587 ecs
->event_thread
= inferior_thread ();
3588 ecs
->ptid
= inferior_ptid
;
3593 switch_to_thread (child
);
3595 switch_to_thread (parent
);
3597 ecs
->event_thread
= inferior_thread ();
3598 ecs
->ptid
= inferior_ptid
;
3603 stop_stepping (ecs
);
3606 ecs
->event_thread
->suspend
.stop_signal
= TARGET_SIGNAL_TRAP
;
3607 goto process_event_stop_test
;
3609 case TARGET_WAITKIND_VFORK_DONE
:
3610 /* Done with the shared memory region. Re-insert breakpoints in
3611 the parent, and keep going. */
3614 fprintf_unfiltered (gdb_stdlog
,
3615 "infrun: TARGET_WAITKIND_VFORK_DONE\n");
3617 if (!ptid_equal (ecs
->ptid
, inferior_ptid
))
3618 context_switch (ecs
->ptid
);
3620 current_inferior ()->waiting_for_vfork_done
= 0;
3621 current_inferior ()->pspace
->breakpoints_not_allowed
= 0;
3622 /* This also takes care of reinserting breakpoints in the
3623 previously locked inferior. */
3627 case TARGET_WAITKIND_EXECD
:
3629 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_EXECD\n");
3631 if (!ptid_equal (ecs
->ptid
, inferior_ptid
))
3633 context_switch (ecs
->ptid
);
3634 reinit_frame_cache ();
3637 singlestep_breakpoints_inserted_p
= 0;
3638 cancel_single_step_breakpoints ();
3640 stop_pc
= regcache_read_pc (get_thread_regcache (ecs
->ptid
));
3642 /* Do whatever is necessary to the parent branch of the vfork. */
3643 handle_vfork_child_exec_or_exit (1);
3645 /* This causes the eventpoints and symbol table to be reset.
3646 Must do this now, before trying to determine whether to
3648 follow_exec (inferior_ptid
, ecs
->ws
.value
.execd_pathname
);
3650 ecs
->event_thread
->control
.stop_bpstat
3651 = bpstat_stop_status (get_regcache_aspace (get_current_regcache ()),
3652 stop_pc
, ecs
->ptid
, &ecs
->ws
);
3654 = !bpstat_explains_signal (ecs
->event_thread
->control
.stop_bpstat
);
3656 /* Note that this may be referenced from inside
3657 bpstat_stop_status above, through inferior_has_execd. */
3658 xfree (ecs
->ws
.value
.execd_pathname
);
3659 ecs
->ws
.value
.execd_pathname
= NULL
;
3661 /* If no catchpoint triggered for this, then keep going. */
3662 if (ecs
->random_signal
)
3664 ecs
->event_thread
->suspend
.stop_signal
= TARGET_SIGNAL_0
;
3668 ecs
->event_thread
->suspend
.stop_signal
= TARGET_SIGNAL_TRAP
;
3669 goto process_event_stop_test
;
3671 /* Be careful not to try to gather much state about a thread
3672 that's in a syscall. It's frequently a losing proposition. */
3673 case TARGET_WAITKIND_SYSCALL_ENTRY
:
3675 fprintf_unfiltered (gdb_stdlog
,
3676 "infrun: TARGET_WAITKIND_SYSCALL_ENTRY\n");
3677 /* Getting the current syscall number. */
3678 if (handle_syscall_event (ecs
) != 0)
3680 goto process_event_stop_test
;
3682 /* Before examining the threads further, step this thread to
3683 get it entirely out of the syscall. (We get notice of the
3684 event when the thread is just on the verge of exiting a
3685 syscall. Stepping one instruction seems to get it back
3687 case TARGET_WAITKIND_SYSCALL_RETURN
:
3689 fprintf_unfiltered (gdb_stdlog
,
3690 "infrun: TARGET_WAITKIND_SYSCALL_RETURN\n");
3691 if (handle_syscall_event (ecs
) != 0)
3693 goto process_event_stop_test
;
3695 case TARGET_WAITKIND_STOPPED
:
3697 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_STOPPED\n");
3698 ecs
->event_thread
->suspend
.stop_signal
= ecs
->ws
.value
.sig
;
3701 case TARGET_WAITKIND_NO_HISTORY
:
3703 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_NO_HISTORY\n");
3704 /* Reverse execution: target ran out of history info. */
3705 stop_pc
= regcache_read_pc (get_thread_regcache (ecs
->ptid
));
3706 print_no_history_reason ();
3707 stop_stepping (ecs
);
3711 if (ecs
->new_thread_event
)
3714 /* Non-stop assumes that the target handles adding new threads
3715 to the thread list. */
3716 internal_error (__FILE__
, __LINE__
,
3717 "targets should add new threads to the thread "
3718 "list themselves in non-stop mode.");
3720 /* We may want to consider not doing a resume here in order to
3721 give the user a chance to play with the new thread. It might
3722 be good to make that a user-settable option. */
3724 /* At this point, all threads are stopped (happens automatically
3725 in either the OS or the native code). Therefore we need to
3726 continue all threads in order to make progress. */
3728 if (!ptid_equal (ecs
->ptid
, inferior_ptid
))
3729 context_switch (ecs
->ptid
);
3730 target_resume (RESUME_ALL
, 0, TARGET_SIGNAL_0
);
3731 prepare_to_wait (ecs
);
3735 if (ecs
->ws
.kind
== TARGET_WAITKIND_STOPPED
)
3737 /* Do we need to clean up the state of a thread that has
3738 completed a displaced single-step? (Doing so usually affects
3739 the PC, so do it here, before we set stop_pc.) */
3740 displaced_step_fixup (ecs
->ptid
,
3741 ecs
->event_thread
->suspend
.stop_signal
);
3743 /* If we either finished a single-step or hit a breakpoint, but
3744 the user wanted this thread to be stopped, pretend we got a
3745 SIG0 (generic unsignaled stop). */
3747 if (ecs
->event_thread
->stop_requested
3748 && ecs
->event_thread
->suspend
.stop_signal
== TARGET_SIGNAL_TRAP
)
3749 ecs
->event_thread
->suspend
.stop_signal
= TARGET_SIGNAL_0
;
3752 stop_pc
= regcache_read_pc (get_thread_regcache (ecs
->ptid
));
3756 struct regcache
*regcache
= get_thread_regcache (ecs
->ptid
);
3757 struct gdbarch
*gdbarch
= get_regcache_arch (regcache
);
3758 struct cleanup
*old_chain
= save_inferior_ptid ();
3760 inferior_ptid
= ecs
->ptid
;
3762 fprintf_unfiltered (gdb_stdlog
, "infrun: stop_pc = %s\n",
3763 paddress (gdbarch
, stop_pc
));
3764 if (target_stopped_by_watchpoint ())
3768 fprintf_unfiltered (gdb_stdlog
, "infrun: stopped by watchpoint\n");
3770 if (target_stopped_data_address (¤t_target
, &addr
))
3771 fprintf_unfiltered (gdb_stdlog
,
3772 "infrun: stopped data address = %s\n",
3773 paddress (gdbarch
, addr
));
3775 fprintf_unfiltered (gdb_stdlog
,
3776 "infrun: (no data address available)\n");
3779 do_cleanups (old_chain
);
3782 if (stepping_past_singlestep_breakpoint
)
3784 gdb_assert (singlestep_breakpoints_inserted_p
);
3785 gdb_assert (ptid_equal (singlestep_ptid
, ecs
->ptid
));
3786 gdb_assert (!ptid_equal (singlestep_ptid
, saved_singlestep_ptid
));
3788 stepping_past_singlestep_breakpoint
= 0;
3790 /* We've either finished single-stepping past the single-step
3791 breakpoint, or stopped for some other reason. It would be nice if
3792 we could tell, but we can't reliably. */
3793 if (ecs
->event_thread
->suspend
.stop_signal
== TARGET_SIGNAL_TRAP
)
3796 fprintf_unfiltered (gdb_stdlog
,
3797 "infrun: stepping_past_"
3798 "singlestep_breakpoint\n");
3799 /* Pull the single step breakpoints out of the target. */
3800 remove_single_step_breakpoints ();
3801 singlestep_breakpoints_inserted_p
= 0;
3803 ecs
->random_signal
= 0;
3804 ecs
->event_thread
->control
.trap_expected
= 0;
3806 context_switch (saved_singlestep_ptid
);
3807 if (deprecated_context_hook
)
3808 deprecated_context_hook (pid_to_thread_id (ecs
->ptid
));
3810 resume (1, TARGET_SIGNAL_0
);
3811 prepare_to_wait (ecs
);
3816 if (!ptid_equal (deferred_step_ptid
, null_ptid
))
3818 /* In non-stop mode, there's never a deferred_step_ptid set. */
3819 gdb_assert (!non_stop
);
3821 /* If we stopped for some other reason than single-stepping, ignore
3822 the fact that we were supposed to switch back. */
3823 if (ecs
->event_thread
->suspend
.stop_signal
== TARGET_SIGNAL_TRAP
)
3826 fprintf_unfiltered (gdb_stdlog
,
3827 "infrun: handling deferred step\n");
3829 /* Pull the single step breakpoints out of the target. */
3830 if (singlestep_breakpoints_inserted_p
)
3832 remove_single_step_breakpoints ();
3833 singlestep_breakpoints_inserted_p
= 0;
3836 ecs
->event_thread
->control
.trap_expected
= 0;
3838 /* Note: We do not call context_switch at this point, as the
3839 context is already set up for stepping the original thread. */
3840 switch_to_thread (deferred_step_ptid
);
3841 deferred_step_ptid
= null_ptid
;
3842 /* Suppress spurious "Switching to ..." message. */
3843 previous_inferior_ptid
= inferior_ptid
;
3845 resume (1, TARGET_SIGNAL_0
);
3846 prepare_to_wait (ecs
);
3850 deferred_step_ptid
= null_ptid
;
3853 /* See if a thread hit a thread-specific breakpoint that was meant for
3854 another thread. If so, then step that thread past the breakpoint,
3857 if (ecs
->event_thread
->suspend
.stop_signal
== TARGET_SIGNAL_TRAP
)
3859 int thread_hop_needed
= 0;
3860 struct address_space
*aspace
=
3861 get_regcache_aspace (get_thread_regcache (ecs
->ptid
));
3863 /* Check if a regular breakpoint has been hit before checking
3864 for a potential single step breakpoint. Otherwise, GDB will
3865 not see this breakpoint hit when stepping onto breakpoints. */
3866 if (regular_breakpoint_inserted_here_p (aspace
, stop_pc
))
3868 ecs
->random_signal
= 0;
3869 if (!breakpoint_thread_match (aspace
, stop_pc
, ecs
->ptid
))
3870 thread_hop_needed
= 1;
3872 else if (singlestep_breakpoints_inserted_p
)
3874 /* We have not context switched yet, so this should be true
3875 no matter which thread hit the singlestep breakpoint. */
3876 gdb_assert (ptid_equal (inferior_ptid
, singlestep_ptid
));
3878 fprintf_unfiltered (gdb_stdlog
, "infrun: software single step "
3880 target_pid_to_str (ecs
->ptid
));
3882 ecs
->random_signal
= 0;
3883 /* The call to in_thread_list is necessary because PTIDs sometimes
3884 change when we go from single-threaded to multi-threaded. If
3885 the singlestep_ptid is still in the list, assume that it is
3886 really different from ecs->ptid. */
3887 if (!ptid_equal (singlestep_ptid
, ecs
->ptid
)
3888 && in_thread_list (singlestep_ptid
))
3890 /* If the PC of the thread we were trying to single-step
3891 has changed, discard this event (which we were going
3892 to ignore anyway), and pretend we saw that thread
3893 trap. This prevents us continuously moving the
3894 single-step breakpoint forward, one instruction at a
3895 time. If the PC has changed, then the thread we were
3896 trying to single-step has trapped or been signalled,
3897 but the event has not been reported to GDB yet.
3899 There might be some cases where this loses signal
3900 information, if a signal has arrived at exactly the
3901 same time that the PC changed, but this is the best
3902 we can do with the information available. Perhaps we
3903 should arrange to report all events for all threads
3904 when they stop, or to re-poll the remote looking for
3905 this particular thread (i.e. temporarily enable
3908 CORE_ADDR new_singlestep_pc
3909 = regcache_read_pc (get_thread_regcache (singlestep_ptid
));
3911 if (new_singlestep_pc
!= singlestep_pc
)
3913 enum target_signal stop_signal
;
3916 fprintf_unfiltered (gdb_stdlog
, "infrun: unexpected thread,"
3917 " but expected thread advanced also\n");
3919 /* The current context still belongs to
3920 singlestep_ptid. Don't swap here, since that's
3921 the context we want to use. Just fudge our
3922 state and continue. */
3923 stop_signal
= ecs
->event_thread
->suspend
.stop_signal
;
3924 ecs
->event_thread
->suspend
.stop_signal
= TARGET_SIGNAL_0
;
3925 ecs
->ptid
= singlestep_ptid
;
3926 ecs
->event_thread
= find_thread_ptid (ecs
->ptid
);
3927 ecs
->event_thread
->suspend
.stop_signal
= stop_signal
;
3928 stop_pc
= new_singlestep_pc
;
3933 fprintf_unfiltered (gdb_stdlog
,
3934 "infrun: unexpected thread\n");
3936 thread_hop_needed
= 1;
3937 stepping_past_singlestep_breakpoint
= 1;
3938 saved_singlestep_ptid
= singlestep_ptid
;
3943 if (thread_hop_needed
)
3945 struct regcache
*thread_regcache
;
3946 int remove_status
= 0;
3949 fprintf_unfiltered (gdb_stdlog
, "infrun: thread_hop_needed\n");
3951 /* Switch context before touching inferior memory, the
3952 previous thread may have exited. */
3953 if (!ptid_equal (inferior_ptid
, ecs
->ptid
))
3954 context_switch (ecs
->ptid
);
3956 /* Saw a breakpoint, but it was hit by the wrong thread.
3959 if (singlestep_breakpoints_inserted_p
)
3961 /* Pull the single step breakpoints out of the target. */
3962 remove_single_step_breakpoints ();
3963 singlestep_breakpoints_inserted_p
= 0;
3966 /* If the arch can displace step, don't remove the
3968 thread_regcache
= get_thread_regcache (ecs
->ptid
);
3969 if (!use_displaced_stepping (get_regcache_arch (thread_regcache
)))
3970 remove_status
= remove_breakpoints ();
3972 /* Did we fail to remove breakpoints? If so, try
3973 to set the PC past the bp. (There's at least
3974 one situation in which we can fail to remove
3975 the bp's: On HP-UX's that use ttrace, we can't
3976 change the address space of a vforking child
3977 process until the child exits (well, okay, not
3978 then either :-) or execs. */
3979 if (remove_status
!= 0)
3980 error (_("Cannot step over breakpoint hit in wrong thread"));
3985 /* Only need to require the next event from this
3986 thread in all-stop mode. */
3987 waiton_ptid
= ecs
->ptid
;
3988 infwait_state
= infwait_thread_hop_state
;
3991 ecs
->event_thread
->stepping_over_breakpoint
= 1;
3996 else if (singlestep_breakpoints_inserted_p
)
3998 ecs
->random_signal
= 0;
4002 ecs
->random_signal
= 1;
4004 /* See if something interesting happened to the non-current thread. If
4005 so, then switch to that thread. */
4006 if (!ptid_equal (ecs
->ptid
, inferior_ptid
))
4009 fprintf_unfiltered (gdb_stdlog
, "infrun: context switch\n");
4011 context_switch (ecs
->ptid
);
4013 if (deprecated_context_hook
)
4014 deprecated_context_hook (pid_to_thread_id (ecs
->ptid
));
4017 /* At this point, get hold of the now-current thread's frame. */
4018 frame
= get_current_frame ();
4019 gdbarch
= get_frame_arch (frame
);
4021 if (singlestep_breakpoints_inserted_p
)
4023 /* Pull the single step breakpoints out of the target. */
4024 remove_single_step_breakpoints ();
4025 singlestep_breakpoints_inserted_p
= 0;
4028 if (stepped_after_stopped_by_watchpoint
)
4029 stopped_by_watchpoint
= 0;
4031 stopped_by_watchpoint
= watchpoints_triggered (&ecs
->ws
);
4033 /* If necessary, step over this watchpoint. We'll be back to display
4035 if (stopped_by_watchpoint
4036 && (target_have_steppable_watchpoint
4037 || gdbarch_have_nonsteppable_watchpoint (gdbarch
)))
4039 /* At this point, we are stopped at an instruction which has
4040 attempted to write to a piece of memory under control of
4041 a watchpoint. The instruction hasn't actually executed
4042 yet. If we were to evaluate the watchpoint expression
4043 now, we would get the old value, and therefore no change
4044 would seem to have occurred.
4046 In order to make watchpoints work `right', we really need
4047 to complete the memory write, and then evaluate the
4048 watchpoint expression. We do this by single-stepping the
4051 It may not be necessary to disable the watchpoint to stop over
4052 it. For example, the PA can (with some kernel cooperation)
4053 single step over a watchpoint without disabling the watchpoint.
4055 It is far more common to need to disable a watchpoint to step
4056 the inferior over it. If we have non-steppable watchpoints,
4057 we must disable the current watchpoint; it's simplest to
4058 disable all watchpoints and breakpoints. */
4061 if (!target_have_steppable_watchpoint
)
4063 remove_breakpoints ();
4064 /* See comment in resume why we need to stop bypassing signals
4065 while breakpoints have been removed. */
4066 target_pass_signals (0, NULL
);
4069 hw_step
= maybe_software_singlestep (gdbarch
, stop_pc
);
4070 target_resume (ecs
->ptid
, hw_step
, TARGET_SIGNAL_0
);
4071 waiton_ptid
= ecs
->ptid
;
4072 if (target_have_steppable_watchpoint
)
4073 infwait_state
= infwait_step_watch_state
;
4075 infwait_state
= infwait_nonstep_watch_state
;
4076 prepare_to_wait (ecs
);
4080 clear_stop_func (ecs
);
4081 ecs
->event_thread
->stepping_over_breakpoint
= 0;
4082 bpstat_clear (&ecs
->event_thread
->control
.stop_bpstat
);
4083 ecs
->event_thread
->control
.stop_step
= 0;
4084 stop_print_frame
= 1;
4085 ecs
->random_signal
= 0;
4086 stopped_by_random_signal
= 0;
4088 /* Hide inlined functions starting here, unless we just performed stepi or
4089 nexti. After stepi and nexti, always show the innermost frame (not any
4090 inline function call sites). */
4091 if (ecs
->event_thread
->control
.step_range_end
!= 1)
4093 struct address_space
*aspace
=
4094 get_regcache_aspace (get_thread_regcache (ecs
->ptid
));
4096 /* skip_inline_frames is expensive, so we avoid it if we can
4097 determine that the address is one where functions cannot have
4098 been inlined. This improves performance with inferiors that
4099 load a lot of shared libraries, because the solib event
4100 breakpoint is defined as the address of a function (i.e. not
4101 inline). Note that we have to check the previous PC as well
4102 as the current one to catch cases when we have just
4103 single-stepped off a breakpoint prior to reinstating it.
4104 Note that we're assuming that the code we single-step to is
4105 not inline, but that's not definitive: there's nothing
4106 preventing the event breakpoint function from containing
4107 inlined code, and the single-step ending up there. If the
4108 user had set a breakpoint on that inlined code, the missing
4109 skip_inline_frames call would break things. Fortunately
4110 that's an extremely unlikely scenario. */
4111 if (!pc_at_non_inline_function (aspace
, stop_pc
, &ecs
->ws
)
4112 && !(ecs
->event_thread
->suspend
.stop_signal
== TARGET_SIGNAL_TRAP
4113 && ecs
->event_thread
->control
.trap_expected
4114 && pc_at_non_inline_function (aspace
,
4115 ecs
->event_thread
->prev_pc
,
4117 skip_inline_frames (ecs
->ptid
);
4120 if (ecs
->event_thread
->suspend
.stop_signal
== TARGET_SIGNAL_TRAP
4121 && ecs
->event_thread
->control
.trap_expected
4122 && gdbarch_single_step_through_delay_p (gdbarch
)
4123 && currently_stepping (ecs
->event_thread
))
4125 /* We're trying to step off a breakpoint. Turns out that we're
4126 also on an instruction that needs to be stepped multiple
4127 times before it's been fully executing. E.g., architectures
4128 with a delay slot. It needs to be stepped twice, once for
4129 the instruction and once for the delay slot. */
4130 int step_through_delay
4131 = gdbarch_single_step_through_delay (gdbarch
, frame
);
4133 if (debug_infrun
&& step_through_delay
)
4134 fprintf_unfiltered (gdb_stdlog
, "infrun: step through delay\n");
4135 if (ecs
->event_thread
->control
.step_range_end
== 0
4136 && step_through_delay
)
4138 /* The user issued a continue when stopped at a breakpoint.
4139 Set up for another trap and get out of here. */
4140 ecs
->event_thread
->stepping_over_breakpoint
= 1;
4144 else if (step_through_delay
)
4146 /* The user issued a step when stopped at a breakpoint.
4147 Maybe we should stop, maybe we should not - the delay
4148 slot *might* correspond to a line of source. In any
4149 case, don't decide that here, just set
4150 ecs->stepping_over_breakpoint, making sure we
4151 single-step again before breakpoints are re-inserted. */
4152 ecs
->event_thread
->stepping_over_breakpoint
= 1;
4156 /* Look at the cause of the stop, and decide what to do.
4157 The alternatives are:
4158 1) stop_stepping and return; to really stop and return to the debugger,
4159 2) keep_going and return to start up again
4160 (set ecs->event_thread->stepping_over_breakpoint to 1 to single step once)
4161 3) set ecs->random_signal to 1, and the decision between 1 and 2
4162 will be made according to the signal handling tables. */
4164 if (ecs
->event_thread
->suspend
.stop_signal
== TARGET_SIGNAL_TRAP
4165 || stop_soon
== STOP_QUIETLY
|| stop_soon
== STOP_QUIETLY_NO_SIGSTOP
4166 || stop_soon
== STOP_QUIETLY_REMOTE
)
4168 if (ecs
->event_thread
->suspend
.stop_signal
== TARGET_SIGNAL_TRAP
4172 fprintf_unfiltered (gdb_stdlog
, "infrun: stopped\n");
4173 stop_print_frame
= 0;
4174 stop_stepping (ecs
);
4178 /* This is originated from start_remote(), start_inferior() and
4179 shared libraries hook functions. */
4180 if (stop_soon
== STOP_QUIETLY
|| stop_soon
== STOP_QUIETLY_REMOTE
)
4183 fprintf_unfiltered (gdb_stdlog
, "infrun: quietly stopped\n");
4184 stop_stepping (ecs
);
4188 /* This originates from attach_command(). We need to overwrite
4189 the stop_signal here, because some kernels don't ignore a
4190 SIGSTOP in a subsequent ptrace(PTRACE_CONT,SIGSTOP) call.
4191 See more comments in inferior.h. On the other hand, if we
4192 get a non-SIGSTOP, report it to the user - assume the backend
4193 will handle the SIGSTOP if it should show up later.
4195 Also consider that the attach is complete when we see a
4196 SIGTRAP. Some systems (e.g. Windows), and stubs supporting
4197 target extended-remote report it instead of a SIGSTOP
4198 (e.g. gdbserver). We already rely on SIGTRAP being our
4199 signal, so this is no exception.
4201 Also consider that the attach is complete when we see a
4202 TARGET_SIGNAL_0. In non-stop mode, GDB will explicitly tell
4203 the target to stop all threads of the inferior, in case the
4204 low level attach operation doesn't stop them implicitly. If
4205 they weren't stopped implicitly, then the stub will report a
4206 TARGET_SIGNAL_0, meaning: stopped for no particular reason
4207 other than GDB's request. */
4208 if (stop_soon
== STOP_QUIETLY_NO_SIGSTOP
4209 && (ecs
->event_thread
->suspend
.stop_signal
== TARGET_SIGNAL_STOP
4210 || ecs
->event_thread
->suspend
.stop_signal
== TARGET_SIGNAL_TRAP
4211 || ecs
->event_thread
->suspend
.stop_signal
== TARGET_SIGNAL_0
))
4213 stop_stepping (ecs
);
4214 ecs
->event_thread
->suspend
.stop_signal
= TARGET_SIGNAL_0
;
4218 /* See if there is a breakpoint/watchpoint/catchpoint/etc. that
4219 handles this event. */
4220 ecs
->event_thread
->control
.stop_bpstat
4221 = bpstat_stop_status (get_regcache_aspace (get_current_regcache ()),
4222 stop_pc
, ecs
->ptid
, &ecs
->ws
);
4224 /* Following in case break condition called a
4226 stop_print_frame
= 1;
4228 /* This is where we handle "moribund" watchpoints. Unlike
4229 software breakpoints traps, hardware watchpoint traps are
4230 always distinguishable from random traps. If no high-level
4231 watchpoint is associated with the reported stop data address
4232 anymore, then the bpstat does not explain the signal ---
4233 simply make sure to ignore it if `stopped_by_watchpoint' is
4237 && ecs
->event_thread
->suspend
.stop_signal
== TARGET_SIGNAL_TRAP
4238 && !bpstat_explains_signal (ecs
->event_thread
->control
.stop_bpstat
)
4239 && stopped_by_watchpoint
)
4240 fprintf_unfiltered (gdb_stdlog
,
4241 "infrun: no user watchpoint explains "
4242 "watchpoint SIGTRAP, ignoring\n");
4244 /* NOTE: cagney/2003-03-29: These two checks for a random signal
4245 at one stage in the past included checks for an inferior
4246 function call's call dummy's return breakpoint. The original
4247 comment, that went with the test, read:
4249 ``End of a stack dummy. Some systems (e.g. Sony news) give
4250 another signal besides SIGTRAP, so check here as well as
4253 If someone ever tries to get call dummys on a
4254 non-executable stack to work (where the target would stop
4255 with something like a SIGSEGV), then those tests might need
4256 to be re-instated. Given, however, that the tests were only
4257 enabled when momentary breakpoints were not being used, I
4258 suspect that it won't be the case.
4260 NOTE: kettenis/2004-02-05: Indeed such checks don't seem to
4261 be necessary for call dummies on a non-executable stack on
4264 if (ecs
->event_thread
->suspend
.stop_signal
== TARGET_SIGNAL_TRAP
)
4266 = !(bpstat_explains_signal (ecs
->event_thread
->control
.stop_bpstat
)
4267 || stopped_by_watchpoint
4268 || ecs
->event_thread
->control
.trap_expected
4269 || (ecs
->event_thread
->control
.step_range_end
4270 && (ecs
->event_thread
->control
.step_resume_breakpoint
4274 ecs
->random_signal
= !bpstat_explains_signal
4275 (ecs
->event_thread
->control
.stop_bpstat
);
4276 if (!ecs
->random_signal
)
4277 ecs
->event_thread
->suspend
.stop_signal
= TARGET_SIGNAL_TRAP
;
4281 /* When we reach this point, we've pretty much decided
4282 that the reason for stopping must've been a random
4283 (unexpected) signal. */
4286 ecs
->random_signal
= 1;
4288 process_event_stop_test
:
4290 /* Re-fetch current thread's frame in case we did a
4291 "goto process_event_stop_test" above. */
4292 frame
= get_current_frame ();
4293 gdbarch
= get_frame_arch (frame
);
4295 /* For the program's own signals, act according to
4296 the signal handling tables. */
4298 if (ecs
->random_signal
)
4300 /* Signal not for debugging purposes. */
4302 struct inferior
*inf
= find_inferior_pid (ptid_get_pid (ecs
->ptid
));
4305 fprintf_unfiltered (gdb_stdlog
, "infrun: random signal %d\n",
4306 ecs
->event_thread
->suspend
.stop_signal
);
4308 stopped_by_random_signal
= 1;
4310 if (signal_print
[ecs
->event_thread
->suspend
.stop_signal
])
4313 target_terminal_ours_for_output ();
4314 print_signal_received_reason
4315 (ecs
->event_thread
->suspend
.stop_signal
);
4317 /* Always stop on signals if we're either just gaining control
4318 of the program, or the user explicitly requested this thread
4319 to remain stopped. */
4320 if (stop_soon
!= NO_STOP_QUIETLY
4321 || ecs
->event_thread
->stop_requested
4323 && signal_stop_state (ecs
->event_thread
->suspend
.stop_signal
)))
4325 stop_stepping (ecs
);
4328 /* If not going to stop, give terminal back
4329 if we took it away. */
4331 target_terminal_inferior ();
4333 /* Clear the signal if it should not be passed. */
4334 if (signal_program
[ecs
->event_thread
->suspend
.stop_signal
] == 0)
4335 ecs
->event_thread
->suspend
.stop_signal
= TARGET_SIGNAL_0
;
4337 if (ecs
->event_thread
->prev_pc
== stop_pc
4338 && ecs
->event_thread
->control
.trap_expected
4339 && ecs
->event_thread
->control
.step_resume_breakpoint
== NULL
)
4341 /* We were just starting a new sequence, attempting to
4342 single-step off of a breakpoint and expecting a SIGTRAP.
4343 Instead this signal arrives. This signal will take us out
4344 of the stepping range so GDB needs to remember to, when
4345 the signal handler returns, resume stepping off that
4347 /* To simplify things, "continue" is forced to use the same
4348 code paths as single-step - set a breakpoint at the
4349 signal return address and then, once hit, step off that
4352 fprintf_unfiltered (gdb_stdlog
,
4353 "infrun: signal arrived while stepping over "
4356 insert_hp_step_resume_breakpoint_at_frame (frame
);
4357 ecs
->event_thread
->step_after_step_resume_breakpoint
= 1;
4358 /* Reset trap_expected to ensure breakpoints are re-inserted. */
4359 ecs
->event_thread
->control
.trap_expected
= 0;
4364 if (ecs
->event_thread
->control
.step_range_end
!= 0
4365 && ecs
->event_thread
->suspend
.stop_signal
!= TARGET_SIGNAL_0
4366 && (ecs
->event_thread
->control
.step_range_start
<= stop_pc
4367 && stop_pc
< ecs
->event_thread
->control
.step_range_end
)
4368 && frame_id_eq (get_stack_frame_id (frame
),
4369 ecs
->event_thread
->control
.step_stack_frame_id
)
4370 && ecs
->event_thread
->control
.step_resume_breakpoint
== NULL
)
4372 /* The inferior is about to take a signal that will take it
4373 out of the single step range. Set a breakpoint at the
4374 current PC (which is presumably where the signal handler
4375 will eventually return) and then allow the inferior to
4378 Note that this is only needed for a signal delivered
4379 while in the single-step range. Nested signals aren't a
4380 problem as they eventually all return. */
4382 fprintf_unfiltered (gdb_stdlog
,
4383 "infrun: signal may take us out of "
4384 "single-step range\n");
4386 insert_hp_step_resume_breakpoint_at_frame (frame
);
4387 /* Reset trap_expected to ensure breakpoints are re-inserted. */
4388 ecs
->event_thread
->control
.trap_expected
= 0;
4393 /* Note: step_resume_breakpoint may be non-NULL. This occures
4394 when either there's a nested signal, or when there's a
4395 pending signal enabled just as the signal handler returns
4396 (leaving the inferior at the step-resume-breakpoint without
4397 actually executing it). Either way continue until the
4398 breakpoint is really hit. */
4403 /* Handle cases caused by hitting a breakpoint. */
4405 CORE_ADDR jmp_buf_pc
;
4406 struct bpstat_what what
;
4408 what
= bpstat_what (ecs
->event_thread
->control
.stop_bpstat
);
4410 if (what
.call_dummy
)
4412 stop_stack_dummy
= what
.call_dummy
;
4415 /* If we hit an internal event that triggers symbol changes, the
4416 current frame will be invalidated within bpstat_what (e.g., if
4417 we hit an internal solib event). Re-fetch it. */
4418 frame
= get_current_frame ();
4419 gdbarch
= get_frame_arch (frame
);
4421 switch (what
.main_action
)
4423 case BPSTAT_WHAT_SET_LONGJMP_RESUME
:
4424 /* If we hit the breakpoint at longjmp while stepping, we
4425 install a momentary breakpoint at the target of the
4429 fprintf_unfiltered (gdb_stdlog
,
4430 "infrun: BPSTAT_WHAT_SET_LONGJMP_RESUME\n");
4432 ecs
->event_thread
->stepping_over_breakpoint
= 1;
4434 if (what
.is_longjmp
)
4436 if (!gdbarch_get_longjmp_target_p (gdbarch
)
4437 || !gdbarch_get_longjmp_target (gdbarch
,
4438 frame
, &jmp_buf_pc
))
4441 fprintf_unfiltered (gdb_stdlog
,
4442 "infrun: BPSTAT_WHAT_SET_LONGJMP_RESUME "
4443 "(!gdbarch_get_longjmp_target)\n");
4448 /* We're going to replace the current step-resume breakpoint
4449 with a longjmp-resume breakpoint. */
4450 delete_step_resume_breakpoint (ecs
->event_thread
);
4452 /* Insert a breakpoint at resume address. */
4453 insert_longjmp_resume_breakpoint (gdbarch
, jmp_buf_pc
);
4457 struct symbol
*func
= get_frame_function (frame
);
4460 check_exception_resume (ecs
, frame
, func
);
4465 case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME
:
4467 fprintf_unfiltered (gdb_stdlog
,
4468 "infrun: BPSTAT_WHAT_CLEAR_LONGJMP_RESUME\n");
4470 if (what
.is_longjmp
)
4472 gdb_assert (ecs
->event_thread
->control
.step_resume_breakpoint
4474 delete_step_resume_breakpoint (ecs
->event_thread
);
4478 /* There are several cases to consider.
4480 1. The initiating frame no longer exists. In this case
4481 we must stop, because the exception has gone too far.
4483 2. The initiating frame exists, and is the same as the
4484 current frame. We stop, because the exception has been
4487 3. The initiating frame exists and is different from
4488 the current frame. This means the exception has been
4489 caught beneath the initiating frame, so keep going. */
4490 struct frame_info
*init_frame
4491 = frame_find_by_id (ecs
->event_thread
->initiating_frame
);
4493 gdb_assert (ecs
->event_thread
->control
.exception_resume_breakpoint
4495 delete_exception_resume_breakpoint (ecs
->event_thread
);
4499 struct frame_id current_id
4500 = get_frame_id (get_current_frame ());
4501 if (frame_id_eq (current_id
,
4502 ecs
->event_thread
->initiating_frame
))
4504 /* Case 2. Fall through. */
4514 /* For Cases 1 and 2, remove the step-resume breakpoint,
4516 delete_step_resume_breakpoint (ecs
->event_thread
);
4519 ecs
->event_thread
->control
.stop_step
= 1;
4520 print_end_stepping_range_reason ();
4521 stop_stepping (ecs
);
4524 case BPSTAT_WHAT_SINGLE
:
4526 fprintf_unfiltered (gdb_stdlog
, "infrun: BPSTAT_WHAT_SINGLE\n");
4527 ecs
->event_thread
->stepping_over_breakpoint
= 1;
4528 /* Still need to check other stuff, at least the case
4529 where we are stepping and step out of the right range. */
4532 case BPSTAT_WHAT_STEP_RESUME
:
4534 fprintf_unfiltered (gdb_stdlog
, "infrun: BPSTAT_WHAT_STEP_RESUME\n");
4536 delete_step_resume_breakpoint (ecs
->event_thread
);
4537 if (ecs
->event_thread
->control
.proceed_to_finish
4538 && execution_direction
== EXEC_REVERSE
)
4540 struct thread_info
*tp
= ecs
->event_thread
;
4542 /* We are finishing a function in reverse, and just hit
4543 the step-resume breakpoint at the start address of the
4544 function, and we're almost there -- just need to back
4545 up by one more single-step, which should take us back
4546 to the function call. */
4547 tp
->control
.step_range_start
= tp
->control
.step_range_end
= 1;
4551 fill_in_stop_func (gdbarch
, ecs
);
4552 if (stop_pc
== ecs
->stop_func_start
4553 && execution_direction
== EXEC_REVERSE
)
4555 /* We are stepping over a function call in reverse, and
4556 just hit the step-resume breakpoint at the start
4557 address of the function. Go back to single-stepping,
4558 which should take us back to the function call. */
4559 ecs
->event_thread
->stepping_over_breakpoint
= 1;
4565 case BPSTAT_WHAT_STOP_NOISY
:
4567 fprintf_unfiltered (gdb_stdlog
, "infrun: BPSTAT_WHAT_STOP_NOISY\n");
4568 stop_print_frame
= 1;
4570 /* We are about to nuke the step_resume_breakpointt via the
4571 cleanup chain, so no need to worry about it here. */
4573 stop_stepping (ecs
);
4576 case BPSTAT_WHAT_STOP_SILENT
:
4578 fprintf_unfiltered (gdb_stdlog
, "infrun: BPSTAT_WHAT_STOP_SILENT\n");
4579 stop_print_frame
= 0;
4581 /* We are about to nuke the step_resume_breakpoin via the
4582 cleanup chain, so no need to worry about it here. */
4584 stop_stepping (ecs
);
4587 case BPSTAT_WHAT_HP_STEP_RESUME
:
4589 fprintf_unfiltered (gdb_stdlog
, "infrun: BPSTAT_WHAT_HP_STEP_RESUME\n");
4591 delete_step_resume_breakpoint (ecs
->event_thread
);
4592 if (ecs
->event_thread
->step_after_step_resume_breakpoint
)
4594 /* Back when the step-resume breakpoint was inserted, we
4595 were trying to single-step off a breakpoint. Go back
4597 ecs
->event_thread
->step_after_step_resume_breakpoint
= 0;
4598 ecs
->event_thread
->stepping_over_breakpoint
= 1;
4604 case BPSTAT_WHAT_KEEP_CHECKING
:
4609 /* We come here if we hit a breakpoint but should not
4610 stop for it. Possibly we also were stepping
4611 and should stop for that. So fall through and
4612 test for stepping. But, if not stepping,
4615 /* In all-stop mode, if we're currently stepping but have stopped in
4616 some other thread, we need to switch back to the stepped thread. */
4619 struct thread_info
*tp
;
4621 tp
= iterate_over_threads (currently_stepping_or_nexting_callback
,
4625 /* However, if the current thread is blocked on some internal
4626 breakpoint, and we simply need to step over that breakpoint
4627 to get it going again, do that first. */
4628 if ((ecs
->event_thread
->control
.trap_expected
4629 && ecs
->event_thread
->suspend
.stop_signal
!= TARGET_SIGNAL_TRAP
)
4630 || ecs
->event_thread
->stepping_over_breakpoint
)
4636 /* If the stepping thread exited, then don't try to switch
4637 back and resume it, which could fail in several different
4638 ways depending on the target. Instead, just keep going.
4640 We can find a stepping dead thread in the thread list in
4643 - The target supports thread exit events, and when the
4644 target tries to delete the thread from the thread list,
4645 inferior_ptid pointed at the exiting thread. In such
4646 case, calling delete_thread does not really remove the
4647 thread from the list; instead, the thread is left listed,
4648 with 'exited' state.
4650 - The target's debug interface does not support thread
4651 exit events, and so we have no idea whatsoever if the
4652 previously stepping thread is still alive. For that
4653 reason, we need to synchronously query the target
4655 if (is_exited (tp
->ptid
)
4656 || !target_thread_alive (tp
->ptid
))
4659 fprintf_unfiltered (gdb_stdlog
,
4660 "infrun: not switching back to "
4661 "stepped thread, it has vanished\n");
4663 delete_thread (tp
->ptid
);
4668 /* Otherwise, we no longer expect a trap in the current thread.
4669 Clear the trap_expected flag before switching back -- this is
4670 what keep_going would do as well, if we called it. */
4671 ecs
->event_thread
->control
.trap_expected
= 0;
4674 fprintf_unfiltered (gdb_stdlog
,
4675 "infrun: switching back to stepped thread\n");
4677 ecs
->event_thread
= tp
;
4678 ecs
->ptid
= tp
->ptid
;
4679 context_switch (ecs
->ptid
);
4685 if (ecs
->event_thread
->control
.step_resume_breakpoint
)
4688 fprintf_unfiltered (gdb_stdlog
,
4689 "infrun: step-resume breakpoint is inserted\n");
4691 /* Having a step-resume breakpoint overrides anything
4692 else having to do with stepping commands until
4693 that breakpoint is reached. */
4698 if (ecs
->event_thread
->control
.step_range_end
== 0)
4701 fprintf_unfiltered (gdb_stdlog
, "infrun: no stepping, continue\n");
4702 /* Likewise if we aren't even stepping. */
4707 /* Re-fetch current thread's frame in case the code above caused
4708 the frame cache to be re-initialized, making our FRAME variable
4709 a dangling pointer. */
4710 frame
= get_current_frame ();
4711 gdbarch
= get_frame_arch (frame
);
4712 fill_in_stop_func (gdbarch
, ecs
);
4714 /* If stepping through a line, keep going if still within it.
4716 Note that step_range_end is the address of the first instruction
4717 beyond the step range, and NOT the address of the last instruction
4720 Note also that during reverse execution, we may be stepping
4721 through a function epilogue and therefore must detect when
4722 the current-frame changes in the middle of a line. */
4724 if (stop_pc
>= ecs
->event_thread
->control
.step_range_start
4725 && stop_pc
< ecs
->event_thread
->control
.step_range_end
4726 && (execution_direction
!= EXEC_REVERSE
4727 || frame_id_eq (get_frame_id (frame
),
4728 ecs
->event_thread
->control
.step_frame_id
)))
4732 (gdb_stdlog
, "infrun: stepping inside range [%s-%s]\n",
4733 paddress (gdbarch
, ecs
->event_thread
->control
.step_range_start
),
4734 paddress (gdbarch
, ecs
->event_thread
->control
.step_range_end
));
4736 /* When stepping backward, stop at beginning of line range
4737 (unless it's the function entry point, in which case
4738 keep going back to the call point). */
4739 if (stop_pc
== ecs
->event_thread
->control
.step_range_start
4740 && stop_pc
!= ecs
->stop_func_start
4741 && execution_direction
== EXEC_REVERSE
)
4743 ecs
->event_thread
->control
.stop_step
= 1;
4744 print_end_stepping_range_reason ();
4745 stop_stepping (ecs
);
4753 /* We stepped out of the stepping range. */
4755 /* If we are stepping at the source level and entered the runtime
4756 loader dynamic symbol resolution code...
4758 EXEC_FORWARD: we keep on single stepping until we exit the run
4759 time loader code and reach the callee's address.
4761 EXEC_REVERSE: we've already executed the callee (backward), and
4762 the runtime loader code is handled just like any other
4763 undebuggable function call. Now we need only keep stepping
4764 backward through the trampoline code, and that's handled further
4765 down, so there is nothing for us to do here. */
4767 if (execution_direction
!= EXEC_REVERSE
4768 && ecs
->event_thread
->control
.step_over_calls
== STEP_OVER_UNDEBUGGABLE
4769 && in_solib_dynsym_resolve_code (stop_pc
))
4771 CORE_ADDR pc_after_resolver
=
4772 gdbarch_skip_solib_resolver (gdbarch
, stop_pc
);
4775 fprintf_unfiltered (gdb_stdlog
,
4776 "infrun: stepped into dynsym resolve code\n");
4778 if (pc_after_resolver
)
4780 /* Set up a step-resume breakpoint at the address
4781 indicated by SKIP_SOLIB_RESOLVER. */
4782 struct symtab_and_line sr_sal
;
4785 sr_sal
.pc
= pc_after_resolver
;
4786 sr_sal
.pspace
= get_frame_program_space (frame
);
4788 insert_step_resume_breakpoint_at_sal (gdbarch
,
4789 sr_sal
, null_frame_id
);
4796 if (ecs
->event_thread
->control
.step_range_end
!= 1
4797 && (ecs
->event_thread
->control
.step_over_calls
== STEP_OVER_UNDEBUGGABLE
4798 || ecs
->event_thread
->control
.step_over_calls
== STEP_OVER_ALL
)
4799 && get_frame_type (frame
) == SIGTRAMP_FRAME
)
4802 fprintf_unfiltered (gdb_stdlog
,
4803 "infrun: stepped into signal trampoline\n");
4804 /* The inferior, while doing a "step" or "next", has ended up in
4805 a signal trampoline (either by a signal being delivered or by
4806 the signal handler returning). Just single-step until the
4807 inferior leaves the trampoline (either by calling the handler
4813 /* Check for subroutine calls. The check for the current frame
4814 equalling the step ID is not necessary - the check of the
4815 previous frame's ID is sufficient - but it is a common case and
4816 cheaper than checking the previous frame's ID.
4818 NOTE: frame_id_eq will never report two invalid frame IDs as
4819 being equal, so to get into this block, both the current and
4820 previous frame must have valid frame IDs. */
4821 /* The outer_frame_id check is a heuristic to detect stepping
4822 through startup code. If we step over an instruction which
4823 sets the stack pointer from an invalid value to a valid value,
4824 we may detect that as a subroutine call from the mythical
4825 "outermost" function. This could be fixed by marking
4826 outermost frames as !stack_p,code_p,special_p. Then the
4827 initial outermost frame, before sp was valid, would
4828 have code_addr == &_start. See the comment in frame_id_eq
4830 if (!frame_id_eq (get_stack_frame_id (frame
),
4831 ecs
->event_thread
->control
.step_stack_frame_id
)
4832 && (frame_id_eq (frame_unwind_caller_id (get_current_frame ()),
4833 ecs
->event_thread
->control
.step_stack_frame_id
)
4834 && (!frame_id_eq (ecs
->event_thread
->control
.step_stack_frame_id
,
4836 || step_start_function
!= find_pc_function (stop_pc
))))
4838 CORE_ADDR real_stop_pc
;
4841 fprintf_unfiltered (gdb_stdlog
, "infrun: stepped into subroutine\n");
4843 if ((ecs
->event_thread
->control
.step_over_calls
== STEP_OVER_NONE
)
4844 || ((ecs
->event_thread
->control
.step_range_end
== 1)
4845 && in_prologue (gdbarch
, ecs
->event_thread
->prev_pc
,
4846 ecs
->stop_func_start
)))
4848 /* I presume that step_over_calls is only 0 when we're
4849 supposed to be stepping at the assembly language level
4850 ("stepi"). Just stop. */
4851 /* Also, maybe we just did a "nexti" inside a prolog, so we
4852 thought it was a subroutine call but it was not. Stop as
4854 /* And this works the same backward as frontward. MVS */
4855 ecs
->event_thread
->control
.stop_step
= 1;
4856 print_end_stepping_range_reason ();
4857 stop_stepping (ecs
);
4861 /* Reverse stepping through solib trampolines. */
4863 if (execution_direction
== EXEC_REVERSE
4864 && ecs
->event_thread
->control
.step_over_calls
!= STEP_OVER_NONE
4865 && (gdbarch_skip_trampoline_code (gdbarch
, frame
, stop_pc
)
4866 || (ecs
->stop_func_start
== 0
4867 && in_solib_dynsym_resolve_code (stop_pc
))))
4869 /* Any solib trampoline code can be handled in reverse
4870 by simply continuing to single-step. We have already
4871 executed the solib function (backwards), and a few
4872 steps will take us back through the trampoline to the
4878 if (ecs
->event_thread
->control
.step_over_calls
== STEP_OVER_ALL
)
4880 /* We're doing a "next".
4882 Normal (forward) execution: set a breakpoint at the
4883 callee's return address (the address at which the caller
4886 Reverse (backward) execution. set the step-resume
4887 breakpoint at the start of the function that we just
4888 stepped into (backwards), and continue to there. When we
4889 get there, we'll need to single-step back to the caller. */
4891 if (execution_direction
== EXEC_REVERSE
)
4893 struct symtab_and_line sr_sal
;
4895 /* Normal function call return (static or dynamic). */
4897 sr_sal
.pc
= ecs
->stop_func_start
;
4898 sr_sal
.pspace
= get_frame_program_space (frame
);
4899 insert_step_resume_breakpoint_at_sal (gdbarch
,
4900 sr_sal
, null_frame_id
);
4903 insert_step_resume_breakpoint_at_caller (frame
);
4909 /* If we are in a function call trampoline (a stub between the
4910 calling routine and the real function), locate the real
4911 function. That's what tells us (a) whether we want to step
4912 into it at all, and (b) what prologue we want to run to the
4913 end of, if we do step into it. */
4914 real_stop_pc
= skip_language_trampoline (frame
, stop_pc
);
4915 if (real_stop_pc
== 0)
4916 real_stop_pc
= gdbarch_skip_trampoline_code (gdbarch
, frame
, stop_pc
);
4917 if (real_stop_pc
!= 0)
4918 ecs
->stop_func_start
= real_stop_pc
;
4920 if (real_stop_pc
!= 0 && in_solib_dynsym_resolve_code (real_stop_pc
))
4922 struct symtab_and_line sr_sal
;
4925 sr_sal
.pc
= ecs
->stop_func_start
;
4926 sr_sal
.pspace
= get_frame_program_space (frame
);
4928 insert_step_resume_breakpoint_at_sal (gdbarch
,
4929 sr_sal
, null_frame_id
);
4934 /* If we have line number information for the function we are
4935 thinking of stepping into and the function isn't on the skip
4938 If there are several symtabs at that PC (e.g. with include
4939 files), just want to know whether *any* of them have line
4940 numbers. find_pc_line handles this. */
4942 struct symtab_and_line tmp_sal
;
4944 tmp_sal
= find_pc_line (ecs
->stop_func_start
, 0);
4945 if (tmp_sal
.line
!= 0
4946 && !function_pc_is_marked_for_skip (ecs
->stop_func_start
))
4948 if (execution_direction
== EXEC_REVERSE
)
4949 handle_step_into_function_backward (gdbarch
, ecs
);
4951 handle_step_into_function (gdbarch
, ecs
);
4956 /* If we have no line number and the step-stop-if-no-debug is
4957 set, we stop the step so that the user has a chance to switch
4958 in assembly mode. */
4959 if (ecs
->event_thread
->control
.step_over_calls
== STEP_OVER_UNDEBUGGABLE
4960 && step_stop_if_no_debug
)
4962 ecs
->event_thread
->control
.stop_step
= 1;
4963 print_end_stepping_range_reason ();
4964 stop_stepping (ecs
);
4968 if (execution_direction
== EXEC_REVERSE
)
4970 /* Set a breakpoint at callee's start address.
4971 From there we can step once and be back in the caller. */
4972 struct symtab_and_line sr_sal
;
4975 sr_sal
.pc
= ecs
->stop_func_start
;
4976 sr_sal
.pspace
= get_frame_program_space (frame
);
4977 insert_step_resume_breakpoint_at_sal (gdbarch
,
4978 sr_sal
, null_frame_id
);
4981 /* Set a breakpoint at callee's return address (the address
4982 at which the caller will resume). */
4983 insert_step_resume_breakpoint_at_caller (frame
);
4989 /* Reverse stepping through solib trampolines. */
4991 if (execution_direction
== EXEC_REVERSE
4992 && ecs
->event_thread
->control
.step_over_calls
!= STEP_OVER_NONE
)
4994 if (gdbarch_skip_trampoline_code (gdbarch
, frame
, stop_pc
)
4995 || (ecs
->stop_func_start
== 0
4996 && in_solib_dynsym_resolve_code (stop_pc
)))
4998 /* Any solib trampoline code can be handled in reverse
4999 by simply continuing to single-step. We have already
5000 executed the solib function (backwards), and a few
5001 steps will take us back through the trampoline to the
5006 else if (in_solib_dynsym_resolve_code (stop_pc
))
5008 /* Stepped backward into the solib dynsym resolver.
5009 Set a breakpoint at its start and continue, then
5010 one more step will take us out. */
5011 struct symtab_and_line sr_sal
;
5014 sr_sal
.pc
= ecs
->stop_func_start
;
5015 sr_sal
.pspace
= get_frame_program_space (frame
);
5016 insert_step_resume_breakpoint_at_sal (gdbarch
,
5017 sr_sal
, null_frame_id
);
5023 /* If we're in the return path from a shared library trampoline,
5024 we want to proceed through the trampoline when stepping. */
5025 if (gdbarch_in_solib_return_trampoline (gdbarch
,
5026 stop_pc
, ecs
->stop_func_name
)
5027 && ecs
->event_thread
->control
.step_over_calls
!= STEP_OVER_NONE
)
5029 /* Determine where this trampoline returns. */
5030 CORE_ADDR real_stop_pc
;
5032 real_stop_pc
= gdbarch_skip_trampoline_code (gdbarch
, frame
, stop_pc
);
5035 fprintf_unfiltered (gdb_stdlog
,
5036 "infrun: stepped into solib return tramp\n");
5038 /* Only proceed through if we know where it's going. */
5041 /* And put the step-breakpoint there and go until there. */
5042 struct symtab_and_line sr_sal
;
5044 init_sal (&sr_sal
); /* initialize to zeroes */
5045 sr_sal
.pc
= real_stop_pc
;
5046 sr_sal
.section
= find_pc_overlay (sr_sal
.pc
);
5047 sr_sal
.pspace
= get_frame_program_space (frame
);
5049 /* Do not specify what the fp should be when we stop since
5050 on some machines the prologue is where the new fp value
5052 insert_step_resume_breakpoint_at_sal (gdbarch
,
5053 sr_sal
, null_frame_id
);
5055 /* Restart without fiddling with the step ranges or
5062 stop_pc_sal
= find_pc_line (stop_pc
, 0);
5064 /* NOTE: tausq/2004-05-24: This if block used to be done before all
5065 the trampoline processing logic, however, there are some trampolines
5066 that have no names, so we should do trampoline handling first. */
5067 if (ecs
->event_thread
->control
.step_over_calls
== STEP_OVER_UNDEBUGGABLE
5068 && ecs
->stop_func_name
== NULL
5069 && stop_pc_sal
.line
== 0)
5072 fprintf_unfiltered (gdb_stdlog
,
5073 "infrun: stepped into undebuggable function\n");
5075 /* The inferior just stepped into, or returned to, an
5076 undebuggable function (where there is no debugging information
5077 and no line number corresponding to the address where the
5078 inferior stopped). Since we want to skip this kind of code,
5079 we keep going until the inferior returns from this
5080 function - unless the user has asked us not to (via
5081 set step-mode) or we no longer know how to get back
5082 to the call site. */
5083 if (step_stop_if_no_debug
5084 || !frame_id_p (frame_unwind_caller_id (frame
)))
5086 /* If we have no line number and the step-stop-if-no-debug
5087 is set, we stop the step so that the user has a chance to
5088 switch in assembly mode. */
5089 ecs
->event_thread
->control
.stop_step
= 1;
5090 print_end_stepping_range_reason ();
5091 stop_stepping (ecs
);
5096 /* Set a breakpoint at callee's return address (the address
5097 at which the caller will resume). */
5098 insert_step_resume_breakpoint_at_caller (frame
);
5104 if (ecs
->event_thread
->control
.step_range_end
== 1)
5106 /* It is stepi or nexti. We always want to stop stepping after
5109 fprintf_unfiltered (gdb_stdlog
, "infrun: stepi/nexti\n");
5110 ecs
->event_thread
->control
.stop_step
= 1;
5111 print_end_stepping_range_reason ();
5112 stop_stepping (ecs
);
5116 if (stop_pc_sal
.line
== 0)
5118 /* We have no line number information. That means to stop
5119 stepping (does this always happen right after one instruction,
5120 when we do "s" in a function with no line numbers,
5121 or can this happen as a result of a return or longjmp?). */
5123 fprintf_unfiltered (gdb_stdlog
, "infrun: no line number info\n");
5124 ecs
->event_thread
->control
.stop_step
= 1;
5125 print_end_stepping_range_reason ();
5126 stop_stepping (ecs
);
5130 /* Look for "calls" to inlined functions, part one. If the inline
5131 frame machinery detected some skipped call sites, we have entered
5132 a new inline function. */
5134 if (frame_id_eq (get_frame_id (get_current_frame ()),
5135 ecs
->event_thread
->control
.step_frame_id
)
5136 && inline_skipped_frames (ecs
->ptid
))
5138 struct symtab_and_line call_sal
;
5141 fprintf_unfiltered (gdb_stdlog
,
5142 "infrun: stepped into inlined function\n");
5144 find_frame_sal (get_current_frame (), &call_sal
);
5146 if (ecs
->event_thread
->control
.step_over_calls
!= STEP_OVER_ALL
)
5148 /* For "step", we're going to stop. But if the call site
5149 for this inlined function is on the same source line as
5150 we were previously stepping, go down into the function
5151 first. Otherwise stop at the call site. */
5153 if (call_sal
.line
== ecs
->event_thread
->current_line
5154 && call_sal
.symtab
== ecs
->event_thread
->current_symtab
)
5155 step_into_inline_frame (ecs
->ptid
);
5157 ecs
->event_thread
->control
.stop_step
= 1;
5158 print_end_stepping_range_reason ();
5159 stop_stepping (ecs
);
5164 /* For "next", we should stop at the call site if it is on a
5165 different source line. Otherwise continue through the
5166 inlined function. */
5167 if (call_sal
.line
== ecs
->event_thread
->current_line
5168 && call_sal
.symtab
== ecs
->event_thread
->current_symtab
)
5172 ecs
->event_thread
->control
.stop_step
= 1;
5173 print_end_stepping_range_reason ();
5174 stop_stepping (ecs
);
5180 /* Look for "calls" to inlined functions, part two. If we are still
5181 in the same real function we were stepping through, but we have
5182 to go further up to find the exact frame ID, we are stepping
5183 through a more inlined call beyond its call site. */
5185 if (get_frame_type (get_current_frame ()) == INLINE_FRAME
5186 && !frame_id_eq (get_frame_id (get_current_frame ()),
5187 ecs
->event_thread
->control
.step_frame_id
)
5188 && stepped_in_from (get_current_frame (),
5189 ecs
->event_thread
->control
.step_frame_id
))
5192 fprintf_unfiltered (gdb_stdlog
,
5193 "infrun: stepping through inlined function\n");
5195 if (ecs
->event_thread
->control
.step_over_calls
== STEP_OVER_ALL
)
5199 ecs
->event_thread
->control
.stop_step
= 1;
5200 print_end_stepping_range_reason ();
5201 stop_stepping (ecs
);
5206 if ((stop_pc
== stop_pc_sal
.pc
)
5207 && (ecs
->event_thread
->current_line
!= stop_pc_sal
.line
5208 || ecs
->event_thread
->current_symtab
!= stop_pc_sal
.symtab
))
5210 /* We are at the start of a different line. So stop. Note that
5211 we don't stop if we step into the middle of a different line.
5212 That is said to make things like for (;;) statements work
5215 fprintf_unfiltered (gdb_stdlog
,
5216 "infrun: stepped to a different line\n");
5217 ecs
->event_thread
->control
.stop_step
= 1;
5218 print_end_stepping_range_reason ();
5219 stop_stepping (ecs
);
5223 /* We aren't done stepping.
5225 Optimize by setting the stepping range to the line.
5226 (We might not be in the original line, but if we entered a
5227 new line in mid-statement, we continue stepping. This makes
5228 things like for(;;) statements work better.) */
5230 ecs
->event_thread
->control
.step_range_start
= stop_pc_sal
.pc
;
5231 ecs
->event_thread
->control
.step_range_end
= stop_pc_sal
.end
;
5232 set_step_info (frame
, stop_pc_sal
);
5235 fprintf_unfiltered (gdb_stdlog
, "infrun: keep going\n");
5239 /* Is thread TP in the middle of single-stepping? */
5242 currently_stepping (struct thread_info
*tp
)
5244 return ((tp
->control
.step_range_end
5245 && tp
->control
.step_resume_breakpoint
== NULL
)
5246 || tp
->control
.trap_expected
5247 || bpstat_should_step ());
5250 /* Returns true if any thread *but* the one passed in "data" is in the
5251 middle of stepping or of handling a "next". */
5254 currently_stepping_or_nexting_callback (struct thread_info
*tp
, void *data
)
5259 return (tp
->control
.step_range_end
5260 || tp
->control
.trap_expected
);
5263 /* Inferior has stepped into a subroutine call with source code that
5264 we should not step over. Do step to the first line of code in
5268 handle_step_into_function (struct gdbarch
*gdbarch
,
5269 struct execution_control_state
*ecs
)
5272 struct symtab_and_line stop_func_sal
, sr_sal
;
5274 fill_in_stop_func (gdbarch
, ecs
);
5276 s
= find_pc_symtab (stop_pc
);
5277 if (s
&& s
->language
!= language_asm
)
5278 ecs
->stop_func_start
= gdbarch_skip_prologue (gdbarch
,
5279 ecs
->stop_func_start
);
5281 stop_func_sal
= find_pc_line (ecs
->stop_func_start
, 0);
5282 /* Use the step_resume_break to step until the end of the prologue,
5283 even if that involves jumps (as it seems to on the vax under
5285 /* If the prologue ends in the middle of a source line, continue to
5286 the end of that source line (if it is still within the function).
5287 Otherwise, just go to end of prologue. */
5288 if (stop_func_sal
.end
5289 && stop_func_sal
.pc
!= ecs
->stop_func_start
5290 && stop_func_sal
.end
< ecs
->stop_func_end
)
5291 ecs
->stop_func_start
= stop_func_sal
.end
;
5293 /* Architectures which require breakpoint adjustment might not be able
5294 to place a breakpoint at the computed address. If so, the test
5295 ``ecs->stop_func_start == stop_pc'' will never succeed. Adjust
5296 ecs->stop_func_start to an address at which a breakpoint may be
5297 legitimately placed.
5299 Note: kevinb/2004-01-19: On FR-V, if this adjustment is not
5300 made, GDB will enter an infinite loop when stepping through
5301 optimized code consisting of VLIW instructions which contain
5302 subinstructions corresponding to different source lines. On
5303 FR-V, it's not permitted to place a breakpoint on any but the
5304 first subinstruction of a VLIW instruction. When a breakpoint is
5305 set, GDB will adjust the breakpoint address to the beginning of
5306 the VLIW instruction. Thus, we need to make the corresponding
5307 adjustment here when computing the stop address. */
5309 if (gdbarch_adjust_breakpoint_address_p (gdbarch
))
5311 ecs
->stop_func_start
5312 = gdbarch_adjust_breakpoint_address (gdbarch
,
5313 ecs
->stop_func_start
);
5316 if (ecs
->stop_func_start
== stop_pc
)
5318 /* We are already there: stop now. */
5319 ecs
->event_thread
->control
.stop_step
= 1;
5320 print_end_stepping_range_reason ();
5321 stop_stepping (ecs
);
5326 /* Put the step-breakpoint there and go until there. */
5327 init_sal (&sr_sal
); /* initialize to zeroes */
5328 sr_sal
.pc
= ecs
->stop_func_start
;
5329 sr_sal
.section
= find_pc_overlay (ecs
->stop_func_start
);
5330 sr_sal
.pspace
= get_frame_program_space (get_current_frame ());
5332 /* Do not specify what the fp should be when we stop since on
5333 some machines the prologue is where the new fp value is
5335 insert_step_resume_breakpoint_at_sal (gdbarch
, sr_sal
, null_frame_id
);
5337 /* And make sure stepping stops right away then. */
5338 ecs
->event_thread
->control
.step_range_end
5339 = ecs
->event_thread
->control
.step_range_start
;
5344 /* Inferior has stepped backward into a subroutine call with source
5345 code that we should not step over. Do step to the beginning of the
5346 last line of code in it. */
5349 handle_step_into_function_backward (struct gdbarch
*gdbarch
,
5350 struct execution_control_state
*ecs
)
5353 struct symtab_and_line stop_func_sal
;
5355 fill_in_stop_func (gdbarch
, ecs
);
5357 s
= find_pc_symtab (stop_pc
);
5358 if (s
&& s
->language
!= language_asm
)
5359 ecs
->stop_func_start
= gdbarch_skip_prologue (gdbarch
,
5360 ecs
->stop_func_start
);
5362 stop_func_sal
= find_pc_line (stop_pc
, 0);
5364 /* OK, we're just going to keep stepping here. */
5365 if (stop_func_sal
.pc
== stop_pc
)
5367 /* We're there already. Just stop stepping now. */
5368 ecs
->event_thread
->control
.stop_step
= 1;
5369 print_end_stepping_range_reason ();
5370 stop_stepping (ecs
);
5374 /* Else just reset the step range and keep going.
5375 No step-resume breakpoint, they don't work for
5376 epilogues, which can have multiple entry paths. */
5377 ecs
->event_thread
->control
.step_range_start
= stop_func_sal
.pc
;
5378 ecs
->event_thread
->control
.step_range_end
= stop_func_sal
.end
;
5384 /* Insert a "step-resume breakpoint" at SR_SAL with frame ID SR_ID.
5385 This is used to both functions and to skip over code. */
5388 insert_step_resume_breakpoint_at_sal_1 (struct gdbarch
*gdbarch
,
5389 struct symtab_and_line sr_sal
,
5390 struct frame_id sr_id
,
5391 enum bptype sr_type
)
5393 /* There should never be more than one step-resume or longjmp-resume
5394 breakpoint per thread, so we should never be setting a new
5395 step_resume_breakpoint when one is already active. */
5396 gdb_assert (inferior_thread ()->control
.step_resume_breakpoint
== NULL
);
5397 gdb_assert (sr_type
== bp_step_resume
|| sr_type
== bp_hp_step_resume
);
5400 fprintf_unfiltered (gdb_stdlog
,
5401 "infrun: inserting step-resume breakpoint at %s\n",
5402 paddress (gdbarch
, sr_sal
.pc
));
5404 inferior_thread ()->control
.step_resume_breakpoint
5405 = set_momentary_breakpoint (gdbarch
, sr_sal
, sr_id
, sr_type
);
5409 insert_step_resume_breakpoint_at_sal (struct gdbarch
*gdbarch
,
5410 struct symtab_and_line sr_sal
,
5411 struct frame_id sr_id
)
5413 insert_step_resume_breakpoint_at_sal_1 (gdbarch
,
5418 /* Insert a "high-priority step-resume breakpoint" at RETURN_FRAME.pc.
5419 This is used to skip a potential signal handler.
5421 This is called with the interrupted function's frame. The signal
5422 handler, when it returns, will resume the interrupted function at
5426 insert_hp_step_resume_breakpoint_at_frame (struct frame_info
*return_frame
)
5428 struct symtab_and_line sr_sal
;
5429 struct gdbarch
*gdbarch
;
5431 gdb_assert (return_frame
!= NULL
);
5432 init_sal (&sr_sal
); /* initialize to zeros */
5434 gdbarch
= get_frame_arch (return_frame
);
5435 sr_sal
.pc
= gdbarch_addr_bits_remove (gdbarch
, get_frame_pc (return_frame
));
5436 sr_sal
.section
= find_pc_overlay (sr_sal
.pc
);
5437 sr_sal
.pspace
= get_frame_program_space (return_frame
);
5439 insert_step_resume_breakpoint_at_sal_1 (gdbarch
, sr_sal
,
5440 get_stack_frame_id (return_frame
),
5444 /* Insert a "step-resume breakpoint" at the previous frame's PC. This
5445 is used to skip a function after stepping into it (for "next" or if
5446 the called function has no debugging information).
5448 The current function has almost always been reached by single
5449 stepping a call or return instruction. NEXT_FRAME belongs to the
5450 current function, and the breakpoint will be set at the caller's
5453 This is a separate function rather than reusing
5454 insert_hp_step_resume_breakpoint_at_frame in order to avoid
5455 get_prev_frame, which may stop prematurely (see the implementation
5456 of frame_unwind_caller_id for an example). */
5459 insert_step_resume_breakpoint_at_caller (struct frame_info
*next_frame
)
5461 struct symtab_and_line sr_sal
;
5462 struct gdbarch
*gdbarch
;
5464 /* We shouldn't have gotten here if we don't know where the call site
5466 gdb_assert (frame_id_p (frame_unwind_caller_id (next_frame
)));
5468 init_sal (&sr_sal
); /* initialize to zeros */
5470 gdbarch
= frame_unwind_caller_arch (next_frame
);
5471 sr_sal
.pc
= gdbarch_addr_bits_remove (gdbarch
,
5472 frame_unwind_caller_pc (next_frame
));
5473 sr_sal
.section
= find_pc_overlay (sr_sal
.pc
);
5474 sr_sal
.pspace
= frame_unwind_program_space (next_frame
);
5476 insert_step_resume_breakpoint_at_sal (gdbarch
, sr_sal
,
5477 frame_unwind_caller_id (next_frame
));
5480 /* Insert a "longjmp-resume" breakpoint at PC. This is used to set a
5481 new breakpoint at the target of a jmp_buf. The handling of
5482 longjmp-resume uses the same mechanisms used for handling
5483 "step-resume" breakpoints. */
5486 insert_longjmp_resume_breakpoint (struct gdbarch
*gdbarch
, CORE_ADDR pc
)
5488 /* There should never be more than one step-resume or longjmp-resume
5489 breakpoint per thread, so we should never be setting a new
5490 longjmp_resume_breakpoint when one is already active. */
5491 gdb_assert (inferior_thread ()->control
.step_resume_breakpoint
== NULL
);
5494 fprintf_unfiltered (gdb_stdlog
,
5495 "infrun: inserting longjmp-resume breakpoint at %s\n",
5496 paddress (gdbarch
, pc
));
5498 inferior_thread ()->control
.step_resume_breakpoint
=
5499 set_momentary_breakpoint_at_pc (gdbarch
, pc
, bp_longjmp_resume
);
5502 /* Insert an exception resume breakpoint. TP is the thread throwing
5503 the exception. The block B is the block of the unwinder debug hook
5504 function. FRAME is the frame corresponding to the call to this
5505 function. SYM is the symbol of the function argument holding the
5506 target PC of the exception. */
5509 insert_exception_resume_breakpoint (struct thread_info
*tp
,
5511 struct frame_info
*frame
,
5514 volatile struct gdb_exception e
;
5516 /* We want to ignore errors here. */
5517 TRY_CATCH (e
, RETURN_MASK_ERROR
)
5519 struct symbol
*vsym
;
5520 struct value
*value
;
5522 struct breakpoint
*bp
;
5524 vsym
= lookup_symbol (SYMBOL_LINKAGE_NAME (sym
), b
, VAR_DOMAIN
, NULL
);
5525 value
= read_var_value (vsym
, frame
);
5526 /* If the value was optimized out, revert to the old behavior. */
5527 if (! value_optimized_out (value
))
5529 handler
= value_as_address (value
);
5532 fprintf_unfiltered (gdb_stdlog
,
5533 "infrun: exception resume at %lx\n",
5534 (unsigned long) handler
);
5536 bp
= set_momentary_breakpoint_at_pc (get_frame_arch (frame
),
5537 handler
, bp_exception_resume
);
5539 /* set_momentary_breakpoint_at_pc invalidates FRAME. */
5542 bp
->thread
= tp
->num
;
5543 inferior_thread ()->control
.exception_resume_breakpoint
= bp
;
5548 /* This is called when an exception has been intercepted. Check to
5549 see whether the exception's destination is of interest, and if so,
5550 set an exception resume breakpoint there. */
5553 check_exception_resume (struct execution_control_state
*ecs
,
5554 struct frame_info
*frame
, struct symbol
*func
)
5556 volatile struct gdb_exception e
;
5558 TRY_CATCH (e
, RETURN_MASK_ERROR
)
5561 struct dict_iterator iter
;
5565 /* The exception breakpoint is a thread-specific breakpoint on
5566 the unwinder's debug hook, declared as:
5568 void _Unwind_DebugHook (void *cfa, void *handler);
5570 The CFA argument indicates the frame to which control is
5571 about to be transferred. HANDLER is the destination PC.
5573 We ignore the CFA and set a temporary breakpoint at HANDLER.
5574 This is not extremely efficient but it avoids issues in gdb
5575 with computing the DWARF CFA, and it also works even in weird
5576 cases such as throwing an exception from inside a signal
5579 b
= SYMBOL_BLOCK_VALUE (func
);
5580 ALL_BLOCK_SYMBOLS (b
, iter
, sym
)
5582 if (!SYMBOL_IS_ARGUMENT (sym
))
5589 insert_exception_resume_breakpoint (ecs
->event_thread
,
5598 stop_stepping (struct execution_control_state
*ecs
)
5601 fprintf_unfiltered (gdb_stdlog
, "infrun: stop_stepping\n");
5603 /* Let callers know we don't want to wait for the inferior anymore. */
5604 ecs
->wait_some_more
= 0;
5607 /* This function handles various cases where we need to continue
5608 waiting for the inferior. */
5609 /* (Used to be the keep_going: label in the old wait_for_inferior). */
5612 keep_going (struct execution_control_state
*ecs
)
5614 /* Make sure normal_stop is called if we get a QUIT handled before
5616 struct cleanup
*old_cleanups
= make_cleanup (resume_cleanups
, 0);
5618 /* Save the pc before execution, to compare with pc after stop. */
5619 ecs
->event_thread
->prev_pc
5620 = regcache_read_pc (get_thread_regcache (ecs
->ptid
));
5622 /* If we did not do break;, it means we should keep running the
5623 inferior and not return to debugger. */
5625 if (ecs
->event_thread
->control
.trap_expected
5626 && ecs
->event_thread
->suspend
.stop_signal
!= TARGET_SIGNAL_TRAP
)
5628 /* We took a signal (which we are supposed to pass through to
5629 the inferior, else we'd not get here) and we haven't yet
5630 gotten our trap. Simply continue. */
5632 discard_cleanups (old_cleanups
);
5633 resume (currently_stepping (ecs
->event_thread
),
5634 ecs
->event_thread
->suspend
.stop_signal
);
5638 /* Either the trap was not expected, but we are continuing
5639 anyway (the user asked that this signal be passed to the
5642 The signal was SIGTRAP, e.g. it was our signal, but we
5643 decided we should resume from it.
5645 We're going to run this baby now!
5647 Note that insert_breakpoints won't try to re-insert
5648 already inserted breakpoints. Therefore, we don't
5649 care if breakpoints were already inserted, or not. */
5651 if (ecs
->event_thread
->stepping_over_breakpoint
)
5653 struct regcache
*thread_regcache
= get_thread_regcache (ecs
->ptid
);
5655 if (!use_displaced_stepping (get_regcache_arch (thread_regcache
)))
5656 /* Since we can't do a displaced step, we have to remove
5657 the breakpoint while we step it. To keep things
5658 simple, we remove them all. */
5659 remove_breakpoints ();
5663 volatile struct gdb_exception e
;
5665 /* Stop stepping when inserting breakpoints
5667 TRY_CATCH (e
, RETURN_MASK_ERROR
)
5669 insert_breakpoints ();
5673 exception_print (gdb_stderr
, e
);
5674 stop_stepping (ecs
);
5679 ecs
->event_thread
->control
.trap_expected
5680 = ecs
->event_thread
->stepping_over_breakpoint
;
5682 /* Do not deliver SIGNAL_TRAP (except when the user explicitly
5683 specifies that such a signal should be delivered to the
5686 Typically, this would occure when a user is debugging a
5687 target monitor on a simulator: the target monitor sets a
5688 breakpoint; the simulator encounters this break-point and
5689 halts the simulation handing control to GDB; GDB, noteing
5690 that the break-point isn't valid, returns control back to the
5691 simulator; the simulator then delivers the hardware
5692 equivalent of a SIGNAL_TRAP to the program being debugged. */
5694 if (ecs
->event_thread
->suspend
.stop_signal
== TARGET_SIGNAL_TRAP
5695 && !signal_program
[ecs
->event_thread
->suspend
.stop_signal
])
5696 ecs
->event_thread
->suspend
.stop_signal
= TARGET_SIGNAL_0
;
5698 discard_cleanups (old_cleanups
);
5699 resume (currently_stepping (ecs
->event_thread
),
5700 ecs
->event_thread
->suspend
.stop_signal
);
5703 prepare_to_wait (ecs
);
5706 /* This function normally comes after a resume, before
5707 handle_inferior_event exits. It takes care of any last bits of
5708 housekeeping, and sets the all-important wait_some_more flag. */
5711 prepare_to_wait (struct execution_control_state
*ecs
)
5714 fprintf_unfiltered (gdb_stdlog
, "infrun: prepare_to_wait\n");
5716 /* This is the old end of the while loop. Let everybody know we
5717 want to wait for the inferior some more and get called again
5719 ecs
->wait_some_more
= 1;
5722 /* Several print_*_reason functions to print why the inferior has stopped.
5723 We always print something when the inferior exits, or receives a signal.
5724 The rest of the cases are dealt with later on in normal_stop and
5725 print_it_typical. Ideally there should be a call to one of these
5726 print_*_reason functions functions from handle_inferior_event each time
5727 stop_stepping is called. */
5729 /* Print why the inferior has stopped.
5730 We are done with a step/next/si/ni command, print why the inferior has
5731 stopped. For now print nothing. Print a message only if not in the middle
5732 of doing a "step n" operation for n > 1. */
5735 print_end_stepping_range_reason (void)
5737 if ((!inferior_thread ()->step_multi
5738 || !inferior_thread ()->control
.stop_step
)
5739 && ui_out_is_mi_like_p (current_uiout
))
5740 ui_out_field_string (current_uiout
, "reason",
5741 async_reason_lookup (EXEC_ASYNC_END_STEPPING_RANGE
));
5744 /* The inferior was terminated by a signal, print why it stopped. */
5747 print_signal_exited_reason (enum target_signal siggnal
)
5749 struct ui_out
*uiout
= current_uiout
;
5751 annotate_signalled ();
5752 if (ui_out_is_mi_like_p (uiout
))
5754 (uiout
, "reason", async_reason_lookup (EXEC_ASYNC_EXITED_SIGNALLED
));
5755 ui_out_text (uiout
, "\nProgram terminated with signal ");
5756 annotate_signal_name ();
5757 ui_out_field_string (uiout
, "signal-name",
5758 target_signal_to_name (siggnal
));
5759 annotate_signal_name_end ();
5760 ui_out_text (uiout
, ", ");
5761 annotate_signal_string ();
5762 ui_out_field_string (uiout
, "signal-meaning",
5763 target_signal_to_string (siggnal
));
5764 annotate_signal_string_end ();
5765 ui_out_text (uiout
, ".\n");
5766 ui_out_text (uiout
, "The program no longer exists.\n");
5769 /* The inferior program is finished, print why it stopped. */
5772 print_exited_reason (int exitstatus
)
5774 struct inferior
*inf
= current_inferior ();
5775 const char *pidstr
= target_pid_to_str (pid_to_ptid (inf
->pid
));
5776 struct ui_out
*uiout
= current_uiout
;
5778 annotate_exited (exitstatus
);
5781 if (ui_out_is_mi_like_p (uiout
))
5782 ui_out_field_string (uiout
, "reason",
5783 async_reason_lookup (EXEC_ASYNC_EXITED
));
5784 ui_out_text (uiout
, "[Inferior ");
5785 ui_out_text (uiout
, plongest (inf
->num
));
5786 ui_out_text (uiout
, " (");
5787 ui_out_text (uiout
, pidstr
);
5788 ui_out_text (uiout
, ") exited with code ");
5789 ui_out_field_fmt (uiout
, "exit-code", "0%o", (unsigned int) exitstatus
);
5790 ui_out_text (uiout
, "]\n");
5794 if (ui_out_is_mi_like_p (uiout
))
5796 (uiout
, "reason", async_reason_lookup (EXEC_ASYNC_EXITED_NORMALLY
));
5797 ui_out_text (uiout
, "[Inferior ");
5798 ui_out_text (uiout
, plongest (inf
->num
));
5799 ui_out_text (uiout
, " (");
5800 ui_out_text (uiout
, pidstr
);
5801 ui_out_text (uiout
, ") exited normally]\n");
5803 /* Support the --return-child-result option. */
5804 return_child_result_value
= exitstatus
;
5807 /* Signal received, print why the inferior has stopped. The signal table
5808 tells us to print about it. */
5811 print_signal_received_reason (enum target_signal siggnal
)
5813 struct ui_out
*uiout
= current_uiout
;
5817 if (siggnal
== TARGET_SIGNAL_0
&& !ui_out_is_mi_like_p (uiout
))
5819 struct thread_info
*t
= inferior_thread ();
5821 ui_out_text (uiout
, "\n[");
5822 ui_out_field_string (uiout
, "thread-name",
5823 target_pid_to_str (t
->ptid
));
5824 ui_out_field_fmt (uiout
, "thread-id", "] #%d", t
->num
);
5825 ui_out_text (uiout
, " stopped");
5829 ui_out_text (uiout
, "\nProgram received signal ");
5830 annotate_signal_name ();
5831 if (ui_out_is_mi_like_p (uiout
))
5833 (uiout
, "reason", async_reason_lookup (EXEC_ASYNC_SIGNAL_RECEIVED
));
5834 ui_out_field_string (uiout
, "signal-name",
5835 target_signal_to_name (siggnal
));
5836 annotate_signal_name_end ();
5837 ui_out_text (uiout
, ", ");
5838 annotate_signal_string ();
5839 ui_out_field_string (uiout
, "signal-meaning",
5840 target_signal_to_string (siggnal
));
5841 annotate_signal_string_end ();
5843 ui_out_text (uiout
, ".\n");
5846 /* Reverse execution: target ran out of history info, print why the inferior
5850 print_no_history_reason (void)
5852 ui_out_text (current_uiout
, "\nNo more reverse-execution history.\n");
5855 /* Here to return control to GDB when the inferior stops for real.
5856 Print appropriate messages, remove breakpoints, give terminal our modes.
5858 STOP_PRINT_FRAME nonzero means print the executing frame
5859 (pc, function, args, file, line number and line text).
5860 BREAKPOINTS_FAILED nonzero means stop was due to error
5861 attempting to insert breakpoints. */
5866 struct target_waitstatus last
;
5868 struct cleanup
*old_chain
= make_cleanup (null_cleanup
, NULL
);
5870 get_last_target_status (&last_ptid
, &last
);
5872 /* If an exception is thrown from this point on, make sure to
5873 propagate GDB's knowledge of the executing state to the
5874 frontend/user running state. A QUIT is an easy exception to see
5875 here, so do this before any filtered output. */
5877 make_cleanup (finish_thread_state_cleanup
, &minus_one_ptid
);
5878 else if (last
.kind
!= TARGET_WAITKIND_SIGNALLED
5879 && last
.kind
!= TARGET_WAITKIND_EXITED
5880 && last
.kind
!= TARGET_WAITKIND_NO_RESUMED
)
5881 make_cleanup (finish_thread_state_cleanup
, &inferior_ptid
);
5883 /* In non-stop mode, we don't want GDB to switch threads behind the
5884 user's back, to avoid races where the user is typing a command to
5885 apply to thread x, but GDB switches to thread y before the user
5886 finishes entering the command. */
5888 /* As with the notification of thread events, we want to delay
5889 notifying the user that we've switched thread context until
5890 the inferior actually stops.
5892 There's no point in saying anything if the inferior has exited.
5893 Note that SIGNALLED here means "exited with a signal", not
5894 "received a signal". */
5896 && !ptid_equal (previous_inferior_ptid
, inferior_ptid
)
5897 && target_has_execution
5898 && last
.kind
!= TARGET_WAITKIND_SIGNALLED
5899 && last
.kind
!= TARGET_WAITKIND_EXITED
5900 && last
.kind
!= TARGET_WAITKIND_NO_RESUMED
)
5902 target_terminal_ours_for_output ();
5903 printf_filtered (_("[Switching to %s]\n"),
5904 target_pid_to_str (inferior_ptid
));
5905 annotate_thread_changed ();
5906 previous_inferior_ptid
= inferior_ptid
;
5909 if (last
.kind
== TARGET_WAITKIND_NO_RESUMED
)
5911 gdb_assert (sync_execution
|| !target_can_async_p ());
5913 target_terminal_ours_for_output ();
5914 printf_filtered (_("No unwaited-for children left.\n"));
5917 if (!breakpoints_always_inserted_mode () && target_has_execution
)
5919 if (remove_breakpoints ())
5921 target_terminal_ours_for_output ();
5922 printf_filtered (_("Cannot remove breakpoints because "
5923 "program is no longer writable.\nFurther "
5924 "execution is probably impossible.\n"));
5928 /* If an auto-display called a function and that got a signal,
5929 delete that auto-display to avoid an infinite recursion. */
5931 if (stopped_by_random_signal
)
5932 disable_current_display ();
5934 /* Don't print a message if in the middle of doing a "step n"
5935 operation for n > 1 */
5936 if (target_has_execution
5937 && last
.kind
!= TARGET_WAITKIND_SIGNALLED
5938 && last
.kind
!= TARGET_WAITKIND_EXITED
5939 && inferior_thread ()->step_multi
5940 && inferior_thread ()->control
.stop_step
)
5943 target_terminal_ours ();
5944 async_enable_stdin ();
5946 /* Set the current source location. This will also happen if we
5947 display the frame below, but the current SAL will be incorrect
5948 during a user hook-stop function. */
5949 if (has_stack_frames () && !stop_stack_dummy
)
5950 set_current_sal_from_frame (get_current_frame (), 1);
5952 /* Let the user/frontend see the threads as stopped. */
5953 do_cleanups (old_chain
);
5955 /* Look up the hook_stop and run it (CLI internally handles problem
5956 of stop_command's pre-hook not existing). */
5958 catch_errors (hook_stop_stub
, stop_command
,
5959 "Error while running hook_stop:\n", RETURN_MASK_ALL
);
5961 if (!has_stack_frames ())
5964 if (last
.kind
== TARGET_WAITKIND_SIGNALLED
5965 || last
.kind
== TARGET_WAITKIND_EXITED
)
5968 /* Select innermost stack frame - i.e., current frame is frame 0,
5969 and current location is based on that.
5970 Don't do this on return from a stack dummy routine,
5971 or if the program has exited. */
5973 if (!stop_stack_dummy
)
5975 select_frame (get_current_frame ());
5977 /* Print current location without a level number, if
5978 we have changed functions or hit a breakpoint.
5979 Print source line if we have one.
5980 bpstat_print() contains the logic deciding in detail
5981 what to print, based on the event(s) that just occurred. */
5983 /* If --batch-silent is enabled then there's no need to print the current
5984 source location, and to try risks causing an error message about
5985 missing source files. */
5986 if (stop_print_frame
&& !batch_silent
)
5990 int do_frame_printing
= 1;
5991 struct thread_info
*tp
= inferior_thread ();
5993 bpstat_ret
= bpstat_print (tp
->control
.stop_bpstat
, last
.kind
);
5997 /* FIXME: cagney/2002-12-01: Given that a frame ID does
5998 (or should) carry around the function and does (or
5999 should) use that when doing a frame comparison. */
6000 if (tp
->control
.stop_step
6001 && frame_id_eq (tp
->control
.step_frame_id
,
6002 get_frame_id (get_current_frame ()))
6003 && step_start_function
== find_pc_function (stop_pc
))
6004 source_flag
= SRC_LINE
; /* Finished step, just
6005 print source line. */
6007 source_flag
= SRC_AND_LOC
; /* Print location and
6010 case PRINT_SRC_AND_LOC
:
6011 source_flag
= SRC_AND_LOC
; /* Print location and
6014 case PRINT_SRC_ONLY
:
6015 source_flag
= SRC_LINE
;
6018 source_flag
= SRC_LINE
; /* something bogus */
6019 do_frame_printing
= 0;
6022 internal_error (__FILE__
, __LINE__
, _("Unknown value."));
6025 /* The behavior of this routine with respect to the source
6027 SRC_LINE: Print only source line
6028 LOCATION: Print only location
6029 SRC_AND_LOC: Print location and source line. */
6030 if (do_frame_printing
)
6031 print_stack_frame (get_selected_frame (NULL
), 0, source_flag
);
6033 /* Display the auto-display expressions. */
6038 /* Save the function value return registers, if we care.
6039 We might be about to restore their previous contents. */
6040 if (inferior_thread ()->control
.proceed_to_finish
6041 && execution_direction
!= EXEC_REVERSE
)
6043 /* This should not be necessary. */
6045 regcache_xfree (stop_registers
);
6047 /* NB: The copy goes through to the target picking up the value of
6048 all the registers. */
6049 stop_registers
= regcache_dup (get_current_regcache ());
6052 if (stop_stack_dummy
== STOP_STACK_DUMMY
)
6054 /* Pop the empty frame that contains the stack dummy.
6055 This also restores inferior state prior to the call
6056 (struct infcall_suspend_state). */
6057 struct frame_info
*frame
= get_current_frame ();
6059 gdb_assert (get_frame_type (frame
) == DUMMY_FRAME
);
6061 /* frame_pop() calls reinit_frame_cache as the last thing it
6062 does which means there's currently no selected frame. We
6063 don't need to re-establish a selected frame if the dummy call
6064 returns normally, that will be done by
6065 restore_infcall_control_state. However, we do have to handle
6066 the case where the dummy call is returning after being
6067 stopped (e.g. the dummy call previously hit a breakpoint).
6068 We can't know which case we have so just always re-establish
6069 a selected frame here. */
6070 select_frame (get_current_frame ());
6074 annotate_stopped ();
6076 /* Suppress the stop observer if we're in the middle of:
6078 - a step n (n > 1), as there still more steps to be done.
6080 - a "finish" command, as the observer will be called in
6081 finish_command_continuation, so it can include the inferior
6082 function's return value.
6084 - calling an inferior function, as we pretend we inferior didn't
6085 run at all. The return value of the call is handled by the
6086 expression evaluator, through call_function_by_hand. */
6088 if (!target_has_execution
6089 || last
.kind
== TARGET_WAITKIND_SIGNALLED
6090 || last
.kind
== TARGET_WAITKIND_EXITED
6091 || last
.kind
== TARGET_WAITKIND_NO_RESUMED
6092 || (!(inferior_thread ()->step_multi
6093 && inferior_thread ()->control
.stop_step
)
6094 && !(inferior_thread ()->control
.stop_bpstat
6095 && inferior_thread ()->control
.proceed_to_finish
)
6096 && !inferior_thread ()->control
.in_infcall
))
6098 if (!ptid_equal (inferior_ptid
, null_ptid
))
6099 observer_notify_normal_stop (inferior_thread ()->control
.stop_bpstat
,
6102 observer_notify_normal_stop (NULL
, stop_print_frame
);
6105 if (target_has_execution
)
6107 if (last
.kind
!= TARGET_WAITKIND_SIGNALLED
6108 && last
.kind
!= TARGET_WAITKIND_EXITED
)
6109 /* Delete the breakpoint we stopped at, if it wants to be deleted.
6110 Delete any breakpoint that is to be deleted at the next stop. */
6111 breakpoint_auto_delete (inferior_thread ()->control
.stop_bpstat
);
6114 /* Try to get rid of automatically added inferiors that are no
6115 longer needed. Keeping those around slows down things linearly.
6116 Note that this never removes the current inferior. */
6121 hook_stop_stub (void *cmd
)
6123 execute_cmd_pre_hook ((struct cmd_list_element
*) cmd
);
6128 signal_stop_state (int signo
)
6130 return signal_stop
[signo
];
6134 signal_print_state (int signo
)
6136 return signal_print
[signo
];
6140 signal_pass_state (int signo
)
6142 return signal_program
[signo
];
6146 signal_cache_update (int signo
)
6150 for (signo
= 0; signo
< (int) TARGET_SIGNAL_LAST
; signo
++)
6151 signal_cache_update (signo
);
6156 signal_pass
[signo
] = (signal_stop
[signo
] == 0
6157 && signal_print
[signo
] == 0
6158 && signal_program
[signo
] == 1);
6162 signal_stop_update (int signo
, int state
)
6164 int ret
= signal_stop
[signo
];
6166 signal_stop
[signo
] = state
;
6167 signal_cache_update (signo
);
6172 signal_print_update (int signo
, int state
)
6174 int ret
= signal_print
[signo
];
6176 signal_print
[signo
] = state
;
6177 signal_cache_update (signo
);
6182 signal_pass_update (int signo
, int state
)
6184 int ret
= signal_program
[signo
];
6186 signal_program
[signo
] = state
;
6187 signal_cache_update (signo
);
6192 sig_print_header (void)
6194 printf_filtered (_("Signal Stop\tPrint\tPass "
6195 "to program\tDescription\n"));
6199 sig_print_info (enum target_signal oursig
)
6201 const char *name
= target_signal_to_name (oursig
);
6202 int name_padding
= 13 - strlen (name
);
6204 if (name_padding
<= 0)
6207 printf_filtered ("%s", name
);
6208 printf_filtered ("%*.*s ", name_padding
, name_padding
, " ");
6209 printf_filtered ("%s\t", signal_stop
[oursig
] ? "Yes" : "No");
6210 printf_filtered ("%s\t", signal_print
[oursig
] ? "Yes" : "No");
6211 printf_filtered ("%s\t\t", signal_program
[oursig
] ? "Yes" : "No");
6212 printf_filtered ("%s\n", target_signal_to_string (oursig
));
6215 /* Specify how various signals in the inferior should be handled. */
6218 handle_command (char *args
, int from_tty
)
6221 int digits
, wordlen
;
6222 int sigfirst
, signum
, siglast
;
6223 enum target_signal oursig
;
6226 unsigned char *sigs
;
6227 struct cleanup
*old_chain
;
6231 error_no_arg (_("signal to handle"));
6234 /* Allocate and zero an array of flags for which signals to handle. */
6236 nsigs
= (int) TARGET_SIGNAL_LAST
;
6237 sigs
= (unsigned char *) alloca (nsigs
);
6238 memset (sigs
, 0, nsigs
);
6240 /* Break the command line up into args. */
6242 argv
= gdb_buildargv (args
);
6243 old_chain
= make_cleanup_freeargv (argv
);
6245 /* Walk through the args, looking for signal oursigs, signal names, and
6246 actions. Signal numbers and signal names may be interspersed with
6247 actions, with the actions being performed for all signals cumulatively
6248 specified. Signal ranges can be specified as <LOW>-<HIGH>. */
6250 while (*argv
!= NULL
)
6252 wordlen
= strlen (*argv
);
6253 for (digits
= 0; isdigit ((*argv
)[digits
]); digits
++)
6257 sigfirst
= siglast
= -1;
6259 if (wordlen
>= 1 && !strncmp (*argv
, "all", wordlen
))
6261 /* Apply action to all signals except those used by the
6262 debugger. Silently skip those. */
6265 siglast
= nsigs
- 1;
6267 else if (wordlen
>= 1 && !strncmp (*argv
, "stop", wordlen
))
6269 SET_SIGS (nsigs
, sigs
, signal_stop
);
6270 SET_SIGS (nsigs
, sigs
, signal_print
);
6272 else if (wordlen
>= 1 && !strncmp (*argv
, "ignore", wordlen
))
6274 UNSET_SIGS (nsigs
, sigs
, signal_program
);
6276 else if (wordlen
>= 2 && !strncmp (*argv
, "print", wordlen
))
6278 SET_SIGS (nsigs
, sigs
, signal_print
);
6280 else if (wordlen
>= 2 && !strncmp (*argv
, "pass", wordlen
))
6282 SET_SIGS (nsigs
, sigs
, signal_program
);
6284 else if (wordlen
>= 3 && !strncmp (*argv
, "nostop", wordlen
))
6286 UNSET_SIGS (nsigs
, sigs
, signal_stop
);
6288 else if (wordlen
>= 3 && !strncmp (*argv
, "noignore", wordlen
))
6290 SET_SIGS (nsigs
, sigs
, signal_program
);
6292 else if (wordlen
>= 4 && !strncmp (*argv
, "noprint", wordlen
))
6294 UNSET_SIGS (nsigs
, sigs
, signal_print
);
6295 UNSET_SIGS (nsigs
, sigs
, signal_stop
);
6297 else if (wordlen
>= 4 && !strncmp (*argv
, "nopass", wordlen
))
6299 UNSET_SIGS (nsigs
, sigs
, signal_program
);
6301 else if (digits
> 0)
6303 /* It is numeric. The numeric signal refers to our own
6304 internal signal numbering from target.h, not to host/target
6305 signal number. This is a feature; users really should be
6306 using symbolic names anyway, and the common ones like
6307 SIGHUP, SIGINT, SIGALRM, etc. will work right anyway. */
6309 sigfirst
= siglast
= (int)
6310 target_signal_from_command (atoi (*argv
));
6311 if ((*argv
)[digits
] == '-')
6314 target_signal_from_command (atoi ((*argv
) + digits
+ 1));
6316 if (sigfirst
> siglast
)
6318 /* Bet he didn't figure we'd think of this case... */
6326 oursig
= target_signal_from_name (*argv
);
6327 if (oursig
!= TARGET_SIGNAL_UNKNOWN
)
6329 sigfirst
= siglast
= (int) oursig
;
6333 /* Not a number and not a recognized flag word => complain. */
6334 error (_("Unrecognized or ambiguous flag word: \"%s\"."), *argv
);
6338 /* If any signal numbers or symbol names were found, set flags for
6339 which signals to apply actions to. */
6341 for (signum
= sigfirst
; signum
>= 0 && signum
<= siglast
; signum
++)
6343 switch ((enum target_signal
) signum
)
6345 case TARGET_SIGNAL_TRAP
:
6346 case TARGET_SIGNAL_INT
:
6347 if (!allsigs
&& !sigs
[signum
])
6349 if (query (_("%s is used by the debugger.\n\
6350 Are you sure you want to change it? "),
6351 target_signal_to_name ((enum target_signal
) signum
)))
6357 printf_unfiltered (_("Not confirmed, unchanged.\n"));
6358 gdb_flush (gdb_stdout
);
6362 case TARGET_SIGNAL_0
:
6363 case TARGET_SIGNAL_DEFAULT
:
6364 case TARGET_SIGNAL_UNKNOWN
:
6365 /* Make sure that "all" doesn't print these. */
6376 for (signum
= 0; signum
< nsigs
; signum
++)
6379 signal_cache_update (-1);
6380 target_pass_signals ((int) TARGET_SIGNAL_LAST
, signal_pass
);
6381 target_program_signals ((int) TARGET_SIGNAL_LAST
, signal_program
);
6385 /* Show the results. */
6386 sig_print_header ();
6387 for (; signum
< nsigs
; signum
++)
6389 sig_print_info (signum
);
6395 do_cleanups (old_chain
);
6399 xdb_handle_command (char *args
, int from_tty
)
6402 struct cleanup
*old_chain
;
6405 error_no_arg (_("xdb command"));
6407 /* Break the command line up into args. */
6409 argv
= gdb_buildargv (args
);
6410 old_chain
= make_cleanup_freeargv (argv
);
6411 if (argv
[1] != (char *) NULL
)
6416 bufLen
= strlen (argv
[0]) + 20;
6417 argBuf
= (char *) xmalloc (bufLen
);
6421 enum target_signal oursig
;
6423 oursig
= target_signal_from_name (argv
[0]);
6424 memset (argBuf
, 0, bufLen
);
6425 if (strcmp (argv
[1], "Q") == 0)
6426 sprintf (argBuf
, "%s %s", argv
[0], "noprint");
6429 if (strcmp (argv
[1], "s") == 0)
6431 if (!signal_stop
[oursig
])
6432 sprintf (argBuf
, "%s %s", argv
[0], "stop");
6434 sprintf (argBuf
, "%s %s", argv
[0], "nostop");
6436 else if (strcmp (argv
[1], "i") == 0)
6438 if (!signal_program
[oursig
])
6439 sprintf (argBuf
, "%s %s", argv
[0], "pass");
6441 sprintf (argBuf
, "%s %s", argv
[0], "nopass");
6443 else if (strcmp (argv
[1], "r") == 0)
6445 if (!signal_print
[oursig
])
6446 sprintf (argBuf
, "%s %s", argv
[0], "print");
6448 sprintf (argBuf
, "%s %s", argv
[0], "noprint");
6454 handle_command (argBuf
, from_tty
);
6456 printf_filtered (_("Invalid signal handling flag.\n"));
6461 do_cleanups (old_chain
);
6465 target_signal_from_command (int num
)
6467 if (num
>= 1 && num
<= 15)
6468 return (enum target_signal
) num
;
6469 error (_("Only signals 1-15 are valid as numeric signals.\n\
6470 Use \"info signals\" for a list of symbolic signals."));
6473 /* Print current contents of the tables set by the handle command.
6474 It is possible we should just be printing signals actually used
6475 by the current target (but for things to work right when switching
6476 targets, all signals should be in the signal tables). */
6479 signals_info (char *signum_exp
, int from_tty
)
6481 enum target_signal oursig
;
6483 sig_print_header ();
6487 /* First see if this is a symbol name. */
6488 oursig
= target_signal_from_name (signum_exp
);
6489 if (oursig
== TARGET_SIGNAL_UNKNOWN
)
6491 /* No, try numeric. */
6493 target_signal_from_command (parse_and_eval_long (signum_exp
));
6495 sig_print_info (oursig
);
6499 printf_filtered ("\n");
6500 /* These ugly casts brought to you by the native VAX compiler. */
6501 for (oursig
= TARGET_SIGNAL_FIRST
;
6502 (int) oursig
< (int) TARGET_SIGNAL_LAST
;
6503 oursig
= (enum target_signal
) ((int) oursig
+ 1))
6507 if (oursig
!= TARGET_SIGNAL_UNKNOWN
6508 && oursig
!= TARGET_SIGNAL_DEFAULT
&& oursig
!= TARGET_SIGNAL_0
)
6509 sig_print_info (oursig
);
6512 printf_filtered (_("\nUse the \"handle\" command "
6513 "to change these tables.\n"));
6516 /* Check if it makes sense to read $_siginfo from the current thread
6517 at this point. If not, throw an error. */
6520 validate_siginfo_access (void)
6522 /* No current inferior, no siginfo. */
6523 if (ptid_equal (inferior_ptid
, null_ptid
))
6524 error (_("No thread selected."));
6526 /* Don't try to read from a dead thread. */
6527 if (is_exited (inferior_ptid
))
6528 error (_("The current thread has terminated"));
6530 /* ... or from a spinning thread. */
6531 if (is_running (inferior_ptid
))
6532 error (_("Selected thread is running."));
6535 /* The $_siginfo convenience variable is a bit special. We don't know
6536 for sure the type of the value until we actually have a chance to
6537 fetch the data. The type can change depending on gdbarch, so it is
6538 also dependent on which thread you have selected.
6540 1. making $_siginfo be an internalvar that creates a new value on
6543 2. making the value of $_siginfo be an lval_computed value. */
6545 /* This function implements the lval_computed support for reading a
6549 siginfo_value_read (struct value
*v
)
6551 LONGEST transferred
;
6553 validate_siginfo_access ();
6556 target_read (¤t_target
, TARGET_OBJECT_SIGNAL_INFO
,
6558 value_contents_all_raw (v
),
6560 TYPE_LENGTH (value_type (v
)));
6562 if (transferred
!= TYPE_LENGTH (value_type (v
)))
6563 error (_("Unable to read siginfo"));
6566 /* This function implements the lval_computed support for writing a
6570 siginfo_value_write (struct value
*v
, struct value
*fromval
)
6572 LONGEST transferred
;
6574 validate_siginfo_access ();
6576 transferred
= target_write (¤t_target
,
6577 TARGET_OBJECT_SIGNAL_INFO
,
6579 value_contents_all_raw (fromval
),
6581 TYPE_LENGTH (value_type (fromval
)));
6583 if (transferred
!= TYPE_LENGTH (value_type (fromval
)))
6584 error (_("Unable to write siginfo"));
6587 static const struct lval_funcs siginfo_value_funcs
=
6593 /* Return a new value with the correct type for the siginfo object of
6594 the current thread using architecture GDBARCH. Return a void value
6595 if there's no object available. */
6597 static struct value
*
6598 siginfo_make_value (struct gdbarch
*gdbarch
, struct internalvar
*var
)
6600 if (target_has_stack
6601 && !ptid_equal (inferior_ptid
, null_ptid
)
6602 && gdbarch_get_siginfo_type_p (gdbarch
))
6604 struct type
*type
= gdbarch_get_siginfo_type (gdbarch
);
6606 return allocate_computed_value (type
, &siginfo_value_funcs
, NULL
);
6609 return allocate_value (builtin_type (gdbarch
)->builtin_void
);
6613 /* infcall_suspend_state contains state about the program itself like its
6614 registers and any signal it received when it last stopped.
6615 This state must be restored regardless of how the inferior function call
6616 ends (either successfully, or after it hits a breakpoint or signal)
6617 if the program is to properly continue where it left off. */
6619 struct infcall_suspend_state
6621 struct thread_suspend_state thread_suspend
;
6622 struct inferior_suspend_state inferior_suspend
;
6626 struct regcache
*registers
;
6628 /* Format of SIGINFO_DATA or NULL if it is not present. */
6629 struct gdbarch
*siginfo_gdbarch
;
6631 /* The inferior format depends on SIGINFO_GDBARCH and it has a length of
6632 TYPE_LENGTH (gdbarch_get_siginfo_type ()). For different gdbarch the
6633 content would be invalid. */
6634 gdb_byte
*siginfo_data
;
6637 struct infcall_suspend_state
*
6638 save_infcall_suspend_state (void)
6640 struct infcall_suspend_state
*inf_state
;
6641 struct thread_info
*tp
= inferior_thread ();
6642 struct inferior
*inf
= current_inferior ();
6643 struct regcache
*regcache
= get_current_regcache ();
6644 struct gdbarch
*gdbarch
= get_regcache_arch (regcache
);
6645 gdb_byte
*siginfo_data
= NULL
;
6647 if (gdbarch_get_siginfo_type_p (gdbarch
))
6649 struct type
*type
= gdbarch_get_siginfo_type (gdbarch
);
6650 size_t len
= TYPE_LENGTH (type
);
6651 struct cleanup
*back_to
;
6653 siginfo_data
= xmalloc (len
);
6654 back_to
= make_cleanup (xfree
, siginfo_data
);
6656 if (target_read (¤t_target
, TARGET_OBJECT_SIGNAL_INFO
, NULL
,
6657 siginfo_data
, 0, len
) == len
)
6658 discard_cleanups (back_to
);
6661 /* Errors ignored. */
6662 do_cleanups (back_to
);
6663 siginfo_data
= NULL
;
6667 inf_state
= XZALLOC (struct infcall_suspend_state
);
6671 inf_state
->siginfo_gdbarch
= gdbarch
;
6672 inf_state
->siginfo_data
= siginfo_data
;
6675 inf_state
->thread_suspend
= tp
->suspend
;
6676 inf_state
->inferior_suspend
= inf
->suspend
;
6678 /* run_inferior_call will not use the signal due to its `proceed' call with
6679 TARGET_SIGNAL_0 anyway. */
6680 tp
->suspend
.stop_signal
= TARGET_SIGNAL_0
;
6682 inf_state
->stop_pc
= stop_pc
;
6684 inf_state
->registers
= regcache_dup (regcache
);
6689 /* Restore inferior session state to INF_STATE. */
6692 restore_infcall_suspend_state (struct infcall_suspend_state
*inf_state
)
6694 struct thread_info
*tp
= inferior_thread ();
6695 struct inferior
*inf
= current_inferior ();
6696 struct regcache
*regcache
= get_current_regcache ();
6697 struct gdbarch
*gdbarch
= get_regcache_arch (regcache
);
6699 tp
->suspend
= inf_state
->thread_suspend
;
6700 inf
->suspend
= inf_state
->inferior_suspend
;
6702 stop_pc
= inf_state
->stop_pc
;
6704 if (inf_state
->siginfo_gdbarch
== gdbarch
)
6706 struct type
*type
= gdbarch_get_siginfo_type (gdbarch
);
6707 size_t len
= TYPE_LENGTH (type
);
6709 /* Errors ignored. */
6710 target_write (¤t_target
, TARGET_OBJECT_SIGNAL_INFO
, NULL
,
6711 inf_state
->siginfo_data
, 0, len
);
6714 /* The inferior can be gone if the user types "print exit(0)"
6715 (and perhaps other times). */
6716 if (target_has_execution
)
6717 /* NB: The register write goes through to the target. */
6718 regcache_cpy (regcache
, inf_state
->registers
);
6720 discard_infcall_suspend_state (inf_state
);
6724 do_restore_infcall_suspend_state_cleanup (void *state
)
6726 restore_infcall_suspend_state (state
);
6730 make_cleanup_restore_infcall_suspend_state
6731 (struct infcall_suspend_state
*inf_state
)
6733 return make_cleanup (do_restore_infcall_suspend_state_cleanup
, inf_state
);
6737 discard_infcall_suspend_state (struct infcall_suspend_state
*inf_state
)
6739 regcache_xfree (inf_state
->registers
);
6740 xfree (inf_state
->siginfo_data
);
6745 get_infcall_suspend_state_regcache (struct infcall_suspend_state
*inf_state
)
6747 return inf_state
->registers
;
6750 /* infcall_control_state contains state regarding gdb's control of the
6751 inferior itself like stepping control. It also contains session state like
6752 the user's currently selected frame. */
6754 struct infcall_control_state
6756 struct thread_control_state thread_control
;
6757 struct inferior_control_state inferior_control
;
6760 enum stop_stack_kind stop_stack_dummy
;
6761 int stopped_by_random_signal
;
6762 int stop_after_trap
;
6764 /* ID if the selected frame when the inferior function call was made. */
6765 struct frame_id selected_frame_id
;
6768 /* Save all of the information associated with the inferior<==>gdb
6771 struct infcall_control_state
*
6772 save_infcall_control_state (void)
6774 struct infcall_control_state
*inf_status
= xmalloc (sizeof (*inf_status
));
6775 struct thread_info
*tp
= inferior_thread ();
6776 struct inferior
*inf
= current_inferior ();
6778 inf_status
->thread_control
= tp
->control
;
6779 inf_status
->inferior_control
= inf
->control
;
6781 tp
->control
.step_resume_breakpoint
= NULL
;
6782 tp
->control
.exception_resume_breakpoint
= NULL
;
6784 /* Save original bpstat chain to INF_STATUS; replace it in TP with copy of
6785 chain. If caller's caller is walking the chain, they'll be happier if we
6786 hand them back the original chain when restore_infcall_control_state is
6788 tp
->control
.stop_bpstat
= bpstat_copy (tp
->control
.stop_bpstat
);
6791 inf_status
->stop_stack_dummy
= stop_stack_dummy
;
6792 inf_status
->stopped_by_random_signal
= stopped_by_random_signal
;
6793 inf_status
->stop_after_trap
= stop_after_trap
;
6795 inf_status
->selected_frame_id
= get_frame_id (get_selected_frame (NULL
));
6801 restore_selected_frame (void *args
)
6803 struct frame_id
*fid
= (struct frame_id
*) args
;
6804 struct frame_info
*frame
;
6806 frame
= frame_find_by_id (*fid
);
6808 /* If inf_status->selected_frame_id is NULL, there was no previously
6812 warning (_("Unable to restore previously selected frame."));
6816 select_frame (frame
);
6821 /* Restore inferior session state to INF_STATUS. */
6824 restore_infcall_control_state (struct infcall_control_state
*inf_status
)
6826 struct thread_info
*tp
= inferior_thread ();
6827 struct inferior
*inf
= current_inferior ();
6829 if (tp
->control
.step_resume_breakpoint
)
6830 tp
->control
.step_resume_breakpoint
->disposition
= disp_del_at_next_stop
;
6832 if (tp
->control
.exception_resume_breakpoint
)
6833 tp
->control
.exception_resume_breakpoint
->disposition
6834 = disp_del_at_next_stop
;
6836 /* Handle the bpstat_copy of the chain. */
6837 bpstat_clear (&tp
->control
.stop_bpstat
);
6839 tp
->control
= inf_status
->thread_control
;
6840 inf
->control
= inf_status
->inferior_control
;
6843 stop_stack_dummy
= inf_status
->stop_stack_dummy
;
6844 stopped_by_random_signal
= inf_status
->stopped_by_random_signal
;
6845 stop_after_trap
= inf_status
->stop_after_trap
;
6847 if (target_has_stack
)
6849 /* The point of catch_errors is that if the stack is clobbered,
6850 walking the stack might encounter a garbage pointer and
6851 error() trying to dereference it. */
6853 (restore_selected_frame
, &inf_status
->selected_frame_id
,
6854 "Unable to restore previously selected frame:\n",
6855 RETURN_MASK_ERROR
) == 0)
6856 /* Error in restoring the selected frame. Select the innermost
6858 select_frame (get_current_frame ());
6865 do_restore_infcall_control_state_cleanup (void *sts
)
6867 restore_infcall_control_state (sts
);
6871 make_cleanup_restore_infcall_control_state
6872 (struct infcall_control_state
*inf_status
)
6874 return make_cleanup (do_restore_infcall_control_state_cleanup
, inf_status
);
6878 discard_infcall_control_state (struct infcall_control_state
*inf_status
)
6880 if (inf_status
->thread_control
.step_resume_breakpoint
)
6881 inf_status
->thread_control
.step_resume_breakpoint
->disposition
6882 = disp_del_at_next_stop
;
6884 if (inf_status
->thread_control
.exception_resume_breakpoint
)
6885 inf_status
->thread_control
.exception_resume_breakpoint
->disposition
6886 = disp_del_at_next_stop
;
6888 /* See save_infcall_control_state for info on stop_bpstat. */
6889 bpstat_clear (&inf_status
->thread_control
.stop_bpstat
);
6895 ptid_match (ptid_t ptid
, ptid_t filter
)
6897 if (ptid_equal (filter
, minus_one_ptid
))
6899 if (ptid_is_pid (filter
)
6900 && ptid_get_pid (ptid
) == ptid_get_pid (filter
))
6902 else if (ptid_equal (ptid
, filter
))
6908 /* restore_inferior_ptid() will be used by the cleanup machinery
6909 to restore the inferior_ptid value saved in a call to
6910 save_inferior_ptid(). */
6913 restore_inferior_ptid (void *arg
)
6915 ptid_t
*saved_ptid_ptr
= arg
;
6917 inferior_ptid
= *saved_ptid_ptr
;
6921 /* Save the value of inferior_ptid so that it may be restored by a
6922 later call to do_cleanups(). Returns the struct cleanup pointer
6923 needed for later doing the cleanup. */
6926 save_inferior_ptid (void)
6928 ptid_t
*saved_ptid_ptr
;
6930 saved_ptid_ptr
= xmalloc (sizeof (ptid_t
));
6931 *saved_ptid_ptr
= inferior_ptid
;
6932 return make_cleanup (restore_inferior_ptid
, saved_ptid_ptr
);
6936 /* User interface for reverse debugging:
6937 Set exec-direction / show exec-direction commands
6938 (returns error unless target implements to_set_exec_direction method). */
6940 int execution_direction
= EXEC_FORWARD
;
6941 static const char exec_forward
[] = "forward";
6942 static const char exec_reverse
[] = "reverse";
6943 static const char *exec_direction
= exec_forward
;
6944 static const char *const exec_direction_names
[] = {
6951 set_exec_direction_func (char *args
, int from_tty
,
6952 struct cmd_list_element
*cmd
)
6954 if (target_can_execute_reverse
)
6956 if (!strcmp (exec_direction
, exec_forward
))
6957 execution_direction
= EXEC_FORWARD
;
6958 else if (!strcmp (exec_direction
, exec_reverse
))
6959 execution_direction
= EXEC_REVERSE
;
6963 exec_direction
= exec_forward
;
6964 error (_("Target does not support this operation."));
6969 show_exec_direction_func (struct ui_file
*out
, int from_tty
,
6970 struct cmd_list_element
*cmd
, const char *value
)
6972 switch (execution_direction
) {
6974 fprintf_filtered (out
, _("Forward.\n"));
6977 fprintf_filtered (out
, _("Reverse.\n"));
6980 internal_error (__FILE__
, __LINE__
,
6981 _("bogus execution_direction value: %d"),
6982 (int) execution_direction
);
6986 /* User interface for non-stop mode. */
6991 set_non_stop (char *args
, int from_tty
,
6992 struct cmd_list_element
*c
)
6994 if (target_has_execution
)
6996 non_stop_1
= non_stop
;
6997 error (_("Cannot change this setting while the inferior is running."));
7000 non_stop
= non_stop_1
;
7004 show_non_stop (struct ui_file
*file
, int from_tty
,
7005 struct cmd_list_element
*c
, const char *value
)
7007 fprintf_filtered (file
,
7008 _("Controlling the inferior in non-stop mode is %s.\n"),
7013 show_schedule_multiple (struct ui_file
*file
, int from_tty
,
7014 struct cmd_list_element
*c
, const char *value
)
7016 fprintf_filtered (file
, _("Resuming the execution of threads "
7017 "of all processes is %s.\n"), value
);
7021 _initialize_infrun (void)
7026 add_info ("signals", signals_info
, _("\
7027 What debugger does when program gets various signals.\n\
7028 Specify a signal as argument to print info on that signal only."));
7029 add_info_alias ("handle", "signals", 0);
7031 add_com ("handle", class_run
, handle_command
, _("\
7032 Specify how to handle a signal.\n\
7033 Args are signals and actions to apply to those signals.\n\
7034 Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\
7035 from 1-15 are allowed for compatibility with old versions of GDB.\n\
7036 Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\
7037 The special arg \"all\" is recognized to mean all signals except those\n\
7038 used by the debugger, typically SIGTRAP and SIGINT.\n\
7039 Recognized actions include \"stop\", \"nostop\", \"print\", \"noprint\",\n\
7040 \"pass\", \"nopass\", \"ignore\", or \"noignore\".\n\
7041 Stop means reenter debugger if this signal happens (implies print).\n\
7042 Print means print a message if this signal happens.\n\
7043 Pass means let program see this signal; otherwise program doesn't know.\n\
7044 Ignore is a synonym for nopass and noignore is a synonym for pass.\n\
7045 Pass and Stop may be combined."));
7048 add_com ("lz", class_info
, signals_info
, _("\
7049 What debugger does when program gets various signals.\n\
7050 Specify a signal as argument to print info on that signal only."));
7051 add_com ("z", class_run
, xdb_handle_command
, _("\
7052 Specify how to handle a signal.\n\
7053 Args are signals and actions to apply to those signals.\n\
7054 Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\
7055 from 1-15 are allowed for compatibility with old versions of GDB.\n\
7056 Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\
7057 The special arg \"all\" is recognized to mean all signals except those\n\
7058 used by the debugger, typically SIGTRAP and SIGINT.\n\
7059 Recognized actions include \"s\" (toggles between stop and nostop),\n\
7060 \"r\" (toggles between print and noprint), \"i\" (toggles between pass and \
7061 nopass), \"Q\" (noprint)\n\
7062 Stop means reenter debugger if this signal happens (implies print).\n\
7063 Print means print a message if this signal happens.\n\
7064 Pass means let program see this signal; otherwise program doesn't know.\n\
7065 Ignore is a synonym for nopass and noignore is a synonym for pass.\n\
7066 Pass and Stop may be combined."));
7070 stop_command
= add_cmd ("stop", class_obscure
,
7071 not_just_help_class_command
, _("\
7072 There is no `stop' command, but you can set a hook on `stop'.\n\
7073 This allows you to set a list of commands to be run each time execution\n\
7074 of the program stops."), &cmdlist
);
7076 add_setshow_zinteger_cmd ("infrun", class_maintenance
, &debug_infrun
, _("\
7077 Set inferior debugging."), _("\
7078 Show inferior debugging."), _("\
7079 When non-zero, inferior specific debugging is enabled."),
7082 &setdebuglist
, &showdebuglist
);
7084 add_setshow_boolean_cmd ("displaced", class_maintenance
,
7085 &debug_displaced
, _("\
7086 Set displaced stepping debugging."), _("\
7087 Show displaced stepping debugging."), _("\
7088 When non-zero, displaced stepping specific debugging is enabled."),
7090 show_debug_displaced
,
7091 &setdebuglist
, &showdebuglist
);
7093 add_setshow_boolean_cmd ("non-stop", no_class
,
7095 Set whether gdb controls the inferior in non-stop mode."), _("\
7096 Show whether gdb controls the inferior in non-stop mode."), _("\
7097 When debugging a multi-threaded program and this setting is\n\
7098 off (the default, also called all-stop mode), when one thread stops\n\
7099 (for a breakpoint, watchpoint, exception, or similar events), GDB stops\n\
7100 all other threads in the program while you interact with the thread of\n\
7101 interest. When you continue or step a thread, you can allow the other\n\
7102 threads to run, or have them remain stopped, but while you inspect any\n\
7103 thread's state, all threads stop.\n\
7105 In non-stop mode, when one thread stops, other threads can continue\n\
7106 to run freely. You'll be able to step each thread independently,\n\
7107 leave it stopped or free to run as needed."),
7113 numsigs
= (int) TARGET_SIGNAL_LAST
;
7114 signal_stop
= (unsigned char *) xmalloc (sizeof (signal_stop
[0]) * numsigs
);
7115 signal_print
= (unsigned char *)
7116 xmalloc (sizeof (signal_print
[0]) * numsigs
);
7117 signal_program
= (unsigned char *)
7118 xmalloc (sizeof (signal_program
[0]) * numsigs
);
7119 signal_pass
= (unsigned char *)
7120 xmalloc (sizeof (signal_program
[0]) * numsigs
);
7121 for (i
= 0; i
< numsigs
; i
++)
7124 signal_print
[i
] = 1;
7125 signal_program
[i
] = 1;
7128 /* Signals caused by debugger's own actions
7129 should not be given to the program afterwards. */
7130 signal_program
[TARGET_SIGNAL_TRAP
] = 0;
7131 signal_program
[TARGET_SIGNAL_INT
] = 0;
7133 /* Signals that are not errors should not normally enter the debugger. */
7134 signal_stop
[TARGET_SIGNAL_ALRM
] = 0;
7135 signal_print
[TARGET_SIGNAL_ALRM
] = 0;
7136 signal_stop
[TARGET_SIGNAL_VTALRM
] = 0;
7137 signal_print
[TARGET_SIGNAL_VTALRM
] = 0;
7138 signal_stop
[TARGET_SIGNAL_PROF
] = 0;
7139 signal_print
[TARGET_SIGNAL_PROF
] = 0;
7140 signal_stop
[TARGET_SIGNAL_CHLD
] = 0;
7141 signal_print
[TARGET_SIGNAL_CHLD
] = 0;
7142 signal_stop
[TARGET_SIGNAL_IO
] = 0;
7143 signal_print
[TARGET_SIGNAL_IO
] = 0;
7144 signal_stop
[TARGET_SIGNAL_POLL
] = 0;
7145 signal_print
[TARGET_SIGNAL_POLL
] = 0;
7146 signal_stop
[TARGET_SIGNAL_URG
] = 0;
7147 signal_print
[TARGET_SIGNAL_URG
] = 0;
7148 signal_stop
[TARGET_SIGNAL_WINCH
] = 0;
7149 signal_print
[TARGET_SIGNAL_WINCH
] = 0;
7150 signal_stop
[TARGET_SIGNAL_PRIO
] = 0;
7151 signal_print
[TARGET_SIGNAL_PRIO
] = 0;
7153 /* These signals are used internally by user-level thread
7154 implementations. (See signal(5) on Solaris.) Like the above
7155 signals, a healthy program receives and handles them as part of
7156 its normal operation. */
7157 signal_stop
[TARGET_SIGNAL_LWP
] = 0;
7158 signal_print
[TARGET_SIGNAL_LWP
] = 0;
7159 signal_stop
[TARGET_SIGNAL_WAITING
] = 0;
7160 signal_print
[TARGET_SIGNAL_WAITING
] = 0;
7161 signal_stop
[TARGET_SIGNAL_CANCEL
] = 0;
7162 signal_print
[TARGET_SIGNAL_CANCEL
] = 0;
7164 /* Update cached state. */
7165 signal_cache_update (-1);
7167 add_setshow_zinteger_cmd ("stop-on-solib-events", class_support
,
7168 &stop_on_solib_events
, _("\
7169 Set stopping for shared library events."), _("\
7170 Show stopping for shared library events."), _("\
7171 If nonzero, gdb will give control to the user when the dynamic linker\n\
7172 notifies gdb of shared library events. The most common event of interest\n\
7173 to the user would be loading/unloading of a new library."),
7175 show_stop_on_solib_events
,
7176 &setlist
, &showlist
);
7178 add_setshow_enum_cmd ("follow-fork-mode", class_run
,
7179 follow_fork_mode_kind_names
,
7180 &follow_fork_mode_string
, _("\
7181 Set debugger response to a program call of fork or vfork."), _("\
7182 Show debugger response to a program call of fork or vfork."), _("\
7183 A fork or vfork creates a new process. follow-fork-mode can be:\n\
7184 parent - the original process is debugged after a fork\n\
7185 child - the new process is debugged after a fork\n\
7186 The unfollowed process will continue to run.\n\
7187 By default, the debugger will follow the parent process."),
7189 show_follow_fork_mode_string
,
7190 &setlist
, &showlist
);
7192 add_setshow_enum_cmd ("follow-exec-mode", class_run
,
7193 follow_exec_mode_names
,
7194 &follow_exec_mode_string
, _("\
7195 Set debugger response to a program call of exec."), _("\
7196 Show debugger response to a program call of exec."), _("\
7197 An exec call replaces the program image of a process.\n\
7199 follow-exec-mode can be:\n\
7201 new - the debugger creates a new inferior and rebinds the process\n\
7202 to this new inferior. The program the process was running before\n\
7203 the exec call can be restarted afterwards by restarting the original\n\
7206 same - the debugger keeps the process bound to the same inferior.\n\
7207 The new executable image replaces the previous executable loaded in\n\
7208 the inferior. Restarting the inferior after the exec call restarts\n\
7209 the executable the process was running after the exec call.\n\
7211 By default, the debugger will use the same inferior."),
7213 show_follow_exec_mode_string
,
7214 &setlist
, &showlist
);
7216 add_setshow_enum_cmd ("scheduler-locking", class_run
,
7217 scheduler_enums
, &scheduler_mode
, _("\
7218 Set mode for locking scheduler during execution."), _("\
7219 Show mode for locking scheduler during execution."), _("\
7220 off == no locking (threads may preempt at any time)\n\
7221 on == full locking (no thread except the current thread may run)\n\
7222 step == scheduler locked during every single-step operation.\n\
7223 In this mode, no other thread may run during a step command.\n\
7224 Other threads may run while stepping over a function call ('next')."),
7225 set_schedlock_func
, /* traps on target vector */
7226 show_scheduler_mode
,
7227 &setlist
, &showlist
);
7229 add_setshow_boolean_cmd ("schedule-multiple", class_run
, &sched_multi
, _("\
7230 Set mode for resuming threads of all processes."), _("\
7231 Show mode for resuming threads of all processes."), _("\
7232 When on, execution commands (such as 'continue' or 'next') resume all\n\
7233 threads of all processes. When off (which is the default), execution\n\
7234 commands only resume the threads of the current process. The set of\n\
7235 threads that are resumed is further refined by the scheduler-locking\n\
7236 mode (see help set scheduler-locking)."),
7238 show_schedule_multiple
,
7239 &setlist
, &showlist
);
7241 add_setshow_boolean_cmd ("step-mode", class_run
, &step_stop_if_no_debug
, _("\
7242 Set mode of the step operation."), _("\
7243 Show mode of the step operation."), _("\
7244 When set, doing a step over a function without debug line information\n\
7245 will stop at the first instruction of that function. Otherwise, the\n\
7246 function is skipped and the step command stops at a different source line."),
7248 show_step_stop_if_no_debug
,
7249 &setlist
, &showlist
);
7251 add_setshow_enum_cmd ("displaced-stepping", class_run
,
7252 can_use_displaced_stepping_enum
,
7253 &can_use_displaced_stepping
, _("\
7254 Set debugger's willingness to use displaced stepping."), _("\
7255 Show debugger's willingness to use displaced stepping."), _("\
7256 If on, gdb will use displaced stepping to step over breakpoints if it is\n\
7257 supported by the target architecture. If off, gdb will not use displaced\n\
7258 stepping to step over breakpoints, even if such is supported by the target\n\
7259 architecture. If auto (which is the default), gdb will use displaced stepping\n\
7260 if the target architecture supports it and non-stop mode is active, but will not\n\
7261 use it in all-stop mode (see help set non-stop)."),
7263 show_can_use_displaced_stepping
,
7264 &setlist
, &showlist
);
7266 add_setshow_enum_cmd ("exec-direction", class_run
, exec_direction_names
,
7267 &exec_direction
, _("Set direction of execution.\n\
7268 Options are 'forward' or 'reverse'."),
7269 _("Show direction of execution (forward/reverse)."),
7270 _("Tells gdb whether to execute forward or backward."),
7271 set_exec_direction_func
, show_exec_direction_func
,
7272 &setlist
, &showlist
);
7274 /* Set/show detach-on-fork: user-settable mode. */
7276 add_setshow_boolean_cmd ("detach-on-fork", class_run
, &detach_fork
, _("\
7277 Set whether gdb will detach the child of a fork."), _("\
7278 Show whether gdb will detach the child of a fork."), _("\
7279 Tells gdb whether to detach the child of a fork."),
7280 NULL
, NULL
, &setlist
, &showlist
);
7282 /* Set/show disable address space randomization mode. */
7284 add_setshow_boolean_cmd ("disable-randomization", class_support
,
7285 &disable_randomization
, _("\
7286 Set disabling of debuggee's virtual address space randomization."), _("\
7287 Show disabling of debuggee's virtual address space randomization."), _("\
7288 When this mode is on (which is the default), randomization of the virtual\n\
7289 address space is disabled. Standalone programs run with the randomization\n\
7290 enabled by default on some platforms."),
7291 &set_disable_randomization
,
7292 &show_disable_randomization
,
7293 &setlist
, &showlist
);
7295 /* ptid initializations */
7296 inferior_ptid
= null_ptid
;
7297 target_last_wait_ptid
= minus_one_ptid
;
7299 observer_attach_thread_ptid_changed (infrun_thread_ptid_changed
);
7300 observer_attach_thread_stop_requested (infrun_thread_stop_requested
);
7301 observer_attach_thread_exit (infrun_thread_thread_exit
);
7302 observer_attach_inferior_exit (infrun_inferior_exit
);
7304 /* Explicitly create without lookup, since that tries to create a
7305 value with a void typed value, and when we get here, gdbarch
7306 isn't initialized yet. At this point, we're quite sure there
7307 isn't another convenience variable of the same name. */
7308 create_internalvar_type_lazy ("_siginfo", siginfo_make_value
);
7310 add_setshow_boolean_cmd ("observer", no_class
,
7311 &observer_mode_1
, _("\
7312 Set whether gdb controls the inferior in observer mode."), _("\
7313 Show whether gdb controls the inferior in observer mode."), _("\
7314 In observer mode, GDB can get data from the inferior, but not\n\
7315 affect its execution. Registers and memory may not be changed,\n\
7316 breakpoints may not be set, and the program cannot be interrupted\n\