1 /* Target-struct-independent code to start (run) and stop an inferior
4 Copyright (C) 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995,
5 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007,
6 2008, 2009 Free Software Foundation, Inc.
8 This file is part of GDB.
10 This program is free software; you can redistribute it and/or modify
11 it under the terms of the GNU General Public License as published by
12 the Free Software Foundation; either version 3 of the License, or
13 (at your option) any later version.
15 This program is distributed in the hope that it will be useful,
16 but WITHOUT ANY WARRANTY; without even the implied warranty of
17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 GNU General Public License for more details.
20 You should have received a copy of the GNU General Public License
21 along with this program. If not, see <http://www.gnu.org/licenses/>. */
24 #include "gdb_string.h"
29 #include "exceptions.h"
30 #include "breakpoint.h"
34 #include "cli/cli-script.h"
36 #include "gdbthread.h"
48 #include "gdb_assert.h"
49 #include "mi/mi-common.h"
50 #include "event-top.h"
53 /* Prototypes for local functions */
55 static void signals_info (char *, int);
57 static void handle_command (char *, int);
59 static void sig_print_info (enum target_signal
);
61 static void sig_print_header (void);
63 static void resume_cleanups (void *);
65 static int hook_stop_stub (void *);
67 static int restore_selected_frame (void *);
69 static void build_infrun (void);
71 static int follow_fork (void);
73 static void set_schedlock_func (char *args
, int from_tty
,
74 struct cmd_list_element
*c
);
76 static int currently_stepping (struct thread_info
*tp
);
78 static int currently_stepping_or_nexting_callback (struct thread_info
*tp
,
81 static void xdb_handle_command (char *args
, int from_tty
);
83 static int prepare_to_proceed (int);
85 void _initialize_infrun (void);
87 void nullify_last_target_wait_ptid (void);
89 /* When set, stop the 'step' command if we enter a function which has
90 no line number information. The normal behavior is that we step
91 over such function. */
92 int step_stop_if_no_debug
= 0;
94 show_step_stop_if_no_debug (struct ui_file
*file
, int from_tty
,
95 struct cmd_list_element
*c
, const char *value
)
97 fprintf_filtered (file
, _("Mode of the step operation is %s.\n"), value
);
100 /* In asynchronous mode, but simulating synchronous execution. */
102 int sync_execution
= 0;
104 /* wait_for_inferior and normal_stop use this to notify the user
105 when the inferior stopped in a different thread than it had been
108 static ptid_t previous_inferior_ptid
;
110 int debug_displaced
= 0;
112 show_debug_displaced (struct ui_file
*file
, int from_tty
,
113 struct cmd_list_element
*c
, const char *value
)
115 fprintf_filtered (file
, _("Displace stepping debugging is %s.\n"), value
);
118 static int debug_infrun
= 0;
120 show_debug_infrun (struct ui_file
*file
, int from_tty
,
121 struct cmd_list_element
*c
, const char *value
)
123 fprintf_filtered (file
, _("Inferior debugging is %s.\n"), value
);
126 /* If the program uses ELF-style shared libraries, then calls to
127 functions in shared libraries go through stubs, which live in a
128 table called the PLT (Procedure Linkage Table). The first time the
129 function is called, the stub sends control to the dynamic linker,
130 which looks up the function's real address, patches the stub so
131 that future calls will go directly to the function, and then passes
132 control to the function.
134 If we are stepping at the source level, we don't want to see any of
135 this --- we just want to skip over the stub and the dynamic linker.
136 The simple approach is to single-step until control leaves the
139 However, on some systems (e.g., Red Hat's 5.2 distribution) the
140 dynamic linker calls functions in the shared C library, so you
141 can't tell from the PC alone whether the dynamic linker is still
142 running. In this case, we use a step-resume breakpoint to get us
143 past the dynamic linker, as if we were using "next" to step over a
146 in_solib_dynsym_resolve_code() says whether we're in the dynamic
147 linker code or not. Normally, this means we single-step. However,
148 if SKIP_SOLIB_RESOLVER then returns non-zero, then its value is an
149 address where we can place a step-resume breakpoint to get past the
150 linker's symbol resolution function.
152 in_solib_dynsym_resolve_code() can generally be implemented in a
153 pretty portable way, by comparing the PC against the address ranges
154 of the dynamic linker's sections.
156 SKIP_SOLIB_RESOLVER is generally going to be system-specific, since
157 it depends on internal details of the dynamic linker. It's usually
158 not too hard to figure out where to put a breakpoint, but it
159 certainly isn't portable. SKIP_SOLIB_RESOLVER should do plenty of
160 sanity checking. If it can't figure things out, returning zero and
161 getting the (possibly confusing) stepping behavior is better than
162 signalling an error, which will obscure the change in the
165 /* This function returns TRUE if pc is the address of an instruction
166 that lies within the dynamic linker (such as the event hook, or the
169 This function must be used only when a dynamic linker event has
170 been caught, and the inferior is being stepped out of the hook, or
171 undefined results are guaranteed. */
173 #ifndef SOLIB_IN_DYNAMIC_LINKER
174 #define SOLIB_IN_DYNAMIC_LINKER(pid,pc) 0
178 /* Convert the #defines into values. This is temporary until wfi control
179 flow is completely sorted out. */
181 #ifndef CANNOT_STEP_HW_WATCHPOINTS
182 #define CANNOT_STEP_HW_WATCHPOINTS 0
184 #undef CANNOT_STEP_HW_WATCHPOINTS
185 #define CANNOT_STEP_HW_WATCHPOINTS 1
188 /* Tables of how to react to signals; the user sets them. */
190 static unsigned char *signal_stop
;
191 static unsigned char *signal_print
;
192 static unsigned char *signal_program
;
194 #define SET_SIGS(nsigs,sigs,flags) \
196 int signum = (nsigs); \
197 while (signum-- > 0) \
198 if ((sigs)[signum]) \
199 (flags)[signum] = 1; \
202 #define UNSET_SIGS(nsigs,sigs,flags) \
204 int signum = (nsigs); \
205 while (signum-- > 0) \
206 if ((sigs)[signum]) \
207 (flags)[signum] = 0; \
210 /* Value to pass to target_resume() to cause all threads to resume */
212 #define RESUME_ALL (pid_to_ptid (-1))
214 /* Command list pointer for the "stop" placeholder. */
216 static struct cmd_list_element
*stop_command
;
218 /* Function inferior was in as of last step command. */
220 static struct symbol
*step_start_function
;
222 /* Nonzero if we want to give control to the user when we're notified
223 of shared library events by the dynamic linker. */
224 static int stop_on_solib_events
;
226 show_stop_on_solib_events (struct ui_file
*file
, int from_tty
,
227 struct cmd_list_element
*c
, const char *value
)
229 fprintf_filtered (file
, _("Stopping for shared library events is %s.\n"),
233 /* Nonzero means expecting a trace trap
234 and should stop the inferior and return silently when it happens. */
238 /* Save register contents here when executing a "finish" command or are
239 about to pop a stack dummy frame, if-and-only-if proceed_to_finish is set.
240 Thus this contains the return value from the called function (assuming
241 values are returned in a register). */
243 struct regcache
*stop_registers
;
245 /* Nonzero after stop if current stack frame should be printed. */
247 static int stop_print_frame
;
249 /* This is a cached copy of the pid/waitstatus of the last event
250 returned by target_wait()/deprecated_target_wait_hook(). This
251 information is returned by get_last_target_status(). */
252 static ptid_t target_last_wait_ptid
;
253 static struct target_waitstatus target_last_waitstatus
;
255 static void context_switch (ptid_t ptid
);
257 void init_thread_stepping_state (struct thread_info
*tss
);
259 void init_infwait_state (void);
261 static const char follow_fork_mode_child
[] = "child";
262 static const char follow_fork_mode_parent
[] = "parent";
264 static const char *follow_fork_mode_kind_names
[] = {
265 follow_fork_mode_child
,
266 follow_fork_mode_parent
,
270 static const char *follow_fork_mode_string
= follow_fork_mode_parent
;
272 show_follow_fork_mode_string (struct ui_file
*file
, int from_tty
,
273 struct cmd_list_element
*c
, const char *value
)
275 fprintf_filtered (file
, _("\
276 Debugger response to a program call of fork or vfork is \"%s\".\n"),
281 /* Tell the target to follow the fork we're stopped at. Returns true
282 if the inferior should be resumed; false, if the target for some
283 reason decided it's best not to resume. */
288 int follow_child
= (follow_fork_mode_string
== follow_fork_mode_child
);
289 int should_resume
= 1;
290 struct thread_info
*tp
;
292 /* Copy user stepping state to the new inferior thread. FIXME: the
293 followed fork child thread should have a copy of most of the
294 parent thread structure's run control related fields, not just these.
295 Initialized to avoid "may be used uninitialized" warnings from gcc. */
296 struct breakpoint
*step_resume_breakpoint
= NULL
;
297 CORE_ADDR step_range_start
= 0;
298 CORE_ADDR step_range_end
= 0;
299 struct frame_id step_frame_id
= { 0 };
304 struct target_waitstatus wait_status
;
306 /* Get the last target status returned by target_wait(). */
307 get_last_target_status (&wait_ptid
, &wait_status
);
309 /* If not stopped at a fork event, then there's nothing else to
311 if (wait_status
.kind
!= TARGET_WAITKIND_FORKED
312 && wait_status
.kind
!= TARGET_WAITKIND_VFORKED
)
315 /* Check if we switched over from WAIT_PTID, since the event was
317 if (!ptid_equal (wait_ptid
, minus_one_ptid
)
318 && !ptid_equal (inferior_ptid
, wait_ptid
))
320 /* We did. Switch back to WAIT_PTID thread, to tell the
321 target to follow it (in either direction). We'll
322 afterwards refuse to resume, and inform the user what
324 switch_to_thread (wait_ptid
);
329 tp
= inferior_thread ();
331 /* If there were any forks/vforks that were caught and are now to be
332 followed, then do so now. */
333 switch (tp
->pending_follow
.kind
)
335 case TARGET_WAITKIND_FORKED
:
336 case TARGET_WAITKIND_VFORKED
:
338 ptid_t parent
, child
;
340 /* If the user did a next/step, etc, over a fork call,
341 preserve the stepping state in the fork child. */
342 if (follow_child
&& should_resume
)
344 step_resume_breakpoint
345 = clone_momentary_breakpoint (tp
->step_resume_breakpoint
);
346 step_range_start
= tp
->step_range_start
;
347 step_range_end
= tp
->step_range_end
;
348 step_frame_id
= tp
->step_frame_id
;
350 /* For now, delete the parent's sr breakpoint, otherwise,
351 parent/child sr breakpoints are considered duplicates,
352 and the child version will not be installed. Remove
353 this when the breakpoints module becomes aware of
354 inferiors and address spaces. */
355 delete_step_resume_breakpoint (tp
);
356 tp
->step_range_start
= 0;
357 tp
->step_range_end
= 0;
358 tp
->step_frame_id
= null_frame_id
;
361 parent
= inferior_ptid
;
362 child
= tp
->pending_follow
.value
.related_pid
;
364 /* Tell the target to do whatever is necessary to follow
365 either parent or child. */
366 if (target_follow_fork (follow_child
))
368 /* Target refused to follow, or there's some other reason
369 we shouldn't resume. */
374 /* This pending follow fork event is now handled, one way
375 or another. The previous selected thread may be gone
376 from the lists by now, but if it is still around, need
377 to clear the pending follow request. */
378 tp
= find_thread_ptid (parent
);
380 tp
->pending_follow
.kind
= TARGET_WAITKIND_SPURIOUS
;
382 /* This makes sure we don't try to apply the "Switched
383 over from WAIT_PID" logic above. */
384 nullify_last_target_wait_ptid ();
386 /* If we followed the child, switch to it... */
389 switch_to_thread (child
);
391 /* ... and preserve the stepping state, in case the
392 user was stepping over the fork call. */
395 tp
= inferior_thread ();
396 tp
->step_resume_breakpoint
= step_resume_breakpoint
;
397 tp
->step_range_start
= step_range_start
;
398 tp
->step_range_end
= step_range_end
;
399 tp
->step_frame_id
= step_frame_id
;
403 /* If we get here, it was because we're trying to
404 resume from a fork catchpoint, but, the user
405 has switched threads away from the thread that
406 forked. In that case, the resume command
407 issued is most likely not applicable to the
408 child, so just warn, and refuse to resume. */
410 Not resuming: switched threads before following fork child.\n"));
413 /* Reset breakpoints in the child as appropriate. */
414 follow_inferior_reset_breakpoints ();
417 switch_to_thread (parent
);
421 case TARGET_WAITKIND_SPURIOUS
:
422 /* Nothing to follow. */
425 internal_error (__FILE__
, __LINE__
,
426 "Unexpected pending_follow.kind %d\n",
427 tp
->pending_follow
.kind
);
431 return should_resume
;
435 follow_inferior_reset_breakpoints (void)
437 struct thread_info
*tp
= inferior_thread ();
439 /* Was there a step_resume breakpoint? (There was if the user
440 did a "next" at the fork() call.) If so, explicitly reset its
443 step_resumes are a form of bp that are made to be per-thread.
444 Since we created the step_resume bp when the parent process
445 was being debugged, and now are switching to the child process,
446 from the breakpoint package's viewpoint, that's a switch of
447 "threads". We must update the bp's notion of which thread
448 it is for, or it'll be ignored when it triggers. */
450 if (tp
->step_resume_breakpoint
)
451 breakpoint_re_set_thread (tp
->step_resume_breakpoint
);
453 /* Reinsert all breakpoints in the child. The user may have set
454 breakpoints after catching the fork, in which case those
455 were never set in the child, but only in the parent. This makes
456 sure the inserted breakpoints match the breakpoint list. */
458 breakpoint_re_set ();
459 insert_breakpoints ();
462 /* EXECD_PATHNAME is assumed to be non-NULL. */
465 follow_exec (ptid_t pid
, char *execd_pathname
)
467 struct target_ops
*tgt
;
468 struct thread_info
*th
= inferior_thread ();
470 /* This is an exec event that we actually wish to pay attention to.
471 Refresh our symbol table to the newly exec'd program, remove any
474 If there are breakpoints, they aren't really inserted now,
475 since the exec() transformed our inferior into a fresh set
478 We want to preserve symbolic breakpoints on the list, since
479 we have hopes that they can be reset after the new a.out's
480 symbol table is read.
482 However, any "raw" breakpoints must be removed from the list
483 (e.g., the solib bp's), since their address is probably invalid
486 And, we DON'T want to call delete_breakpoints() here, since
487 that may write the bp's "shadow contents" (the instruction
488 value that was overwritten witha TRAP instruction). Since
489 we now have a new a.out, those shadow contents aren't valid. */
490 update_breakpoints_after_exec ();
492 /* If there was one, it's gone now. We cannot truly step-to-next
493 statement through an exec(). */
494 th
->step_resume_breakpoint
= NULL
;
495 th
->step_range_start
= 0;
496 th
->step_range_end
= 0;
498 /* The target reports the exec event to the main thread, even if
499 some other thread does the exec, and even if the main thread was
500 already stopped --- if debugging in non-stop mode, it's possible
501 the user had the main thread held stopped in the previous image
502 --- release it now. This is the same behavior as step-over-exec
503 with scheduler-locking on in all-stop mode. */
504 th
->stop_requested
= 0;
506 /* What is this a.out's name? */
507 printf_unfiltered (_("Executing new program: %s\n"), execd_pathname
);
509 /* We've followed the inferior through an exec. Therefore, the
510 inferior has essentially been killed & reborn. */
512 gdb_flush (gdb_stdout
);
514 breakpoint_init_inferior (inf_execd
);
516 if (gdb_sysroot
&& *gdb_sysroot
)
518 char *name
= alloca (strlen (gdb_sysroot
)
519 + strlen (execd_pathname
)
521 strcpy (name
, gdb_sysroot
);
522 strcat (name
, execd_pathname
);
523 execd_pathname
= name
;
526 /* That a.out is now the one to use. */
527 exec_file_attach (execd_pathname
, 0);
529 /* Reset the shared library package. This ensures that we get a
530 shlib event when the child reaches "_start", at which point the
531 dld will have had a chance to initialize the child. */
532 /* Also, loading a symbol file below may trigger symbol lookups, and
533 we don't want those to be satisfied by the libraries of the
534 previous incarnation of this process. */
535 no_shared_libraries (NULL
, 0);
537 /* Load the main file's symbols. */
538 symbol_file_add_main (execd_pathname
, 0);
540 #ifdef SOLIB_CREATE_INFERIOR_HOOK
541 SOLIB_CREATE_INFERIOR_HOOK (PIDGET (inferior_ptid
));
543 solib_create_inferior_hook ();
546 /* Reinsert all breakpoints. (Those which were symbolic have
547 been reset to the proper address in the new a.out, thanks
548 to symbol_file_command...) */
549 insert_breakpoints ();
551 /* The next resume of this inferior should bring it to the shlib
552 startup breakpoints. (If the user had also set bp's on
553 "main" from the old (parent) process, then they'll auto-
554 matically get reset there in the new process.) */
557 /* Non-zero if we just simulating a single-step. This is needed
558 because we cannot remove the breakpoints in the inferior process
559 until after the `wait' in `wait_for_inferior'. */
560 static int singlestep_breakpoints_inserted_p
= 0;
562 /* The thread we inserted single-step breakpoints for. */
563 static ptid_t singlestep_ptid
;
565 /* PC when we started this single-step. */
566 static CORE_ADDR singlestep_pc
;
568 /* If another thread hit the singlestep breakpoint, we save the original
569 thread here so that we can resume single-stepping it later. */
570 static ptid_t saved_singlestep_ptid
;
571 static int stepping_past_singlestep_breakpoint
;
573 /* If not equal to null_ptid, this means that after stepping over breakpoint
574 is finished, we need to switch to deferred_step_ptid, and step it.
576 The use case is when one thread has hit a breakpoint, and then the user
577 has switched to another thread and issued 'step'. We need to step over
578 breakpoint in the thread which hit the breakpoint, but then continue
579 stepping the thread user has selected. */
580 static ptid_t deferred_step_ptid
;
582 /* Displaced stepping. */
584 /* In non-stop debugging mode, we must take special care to manage
585 breakpoints properly; in particular, the traditional strategy for
586 stepping a thread past a breakpoint it has hit is unsuitable.
587 'Displaced stepping' is a tactic for stepping one thread past a
588 breakpoint it has hit while ensuring that other threads running
589 concurrently will hit the breakpoint as they should.
591 The traditional way to step a thread T off a breakpoint in a
592 multi-threaded program in all-stop mode is as follows:
594 a0) Initially, all threads are stopped, and breakpoints are not
596 a1) We single-step T, leaving breakpoints uninserted.
597 a2) We insert breakpoints, and resume all threads.
599 In non-stop debugging, however, this strategy is unsuitable: we
600 don't want to have to stop all threads in the system in order to
601 continue or step T past a breakpoint. Instead, we use displaced
604 n0) Initially, T is stopped, other threads are running, and
605 breakpoints are inserted.
606 n1) We copy the instruction "under" the breakpoint to a separate
607 location, outside the main code stream, making any adjustments
608 to the instruction, register, and memory state as directed by
610 n2) We single-step T over the instruction at its new location.
611 n3) We adjust the resulting register and memory state as directed
612 by T's architecture. This includes resetting T's PC to point
613 back into the main instruction stream.
616 This approach depends on the following gdbarch methods:
618 - gdbarch_max_insn_length and gdbarch_displaced_step_location
619 indicate where to copy the instruction, and how much space must
620 be reserved there. We use these in step n1.
622 - gdbarch_displaced_step_copy_insn copies a instruction to a new
623 address, and makes any necessary adjustments to the instruction,
624 register contents, and memory. We use this in step n1.
626 - gdbarch_displaced_step_fixup adjusts registers and memory after
627 we have successfuly single-stepped the instruction, to yield the
628 same effect the instruction would have had if we had executed it
629 at its original address. We use this in step n3.
631 - gdbarch_displaced_step_free_closure provides cleanup.
633 The gdbarch_displaced_step_copy_insn and
634 gdbarch_displaced_step_fixup functions must be written so that
635 copying an instruction with gdbarch_displaced_step_copy_insn,
636 single-stepping across the copied instruction, and then applying
637 gdbarch_displaced_insn_fixup should have the same effects on the
638 thread's memory and registers as stepping the instruction in place
639 would have. Exactly which responsibilities fall to the copy and
640 which fall to the fixup is up to the author of those functions.
642 See the comments in gdbarch.sh for details.
644 Note that displaced stepping and software single-step cannot
645 currently be used in combination, although with some care I think
646 they could be made to. Software single-step works by placing
647 breakpoints on all possible subsequent instructions; if the
648 displaced instruction is a PC-relative jump, those breakpoints
649 could fall in very strange places --- on pages that aren't
650 executable, or at addresses that are not proper instruction
651 boundaries. (We do generally let other threads run while we wait
652 to hit the software single-step breakpoint, and they might
653 encounter such a corrupted instruction.) One way to work around
654 this would be to have gdbarch_displaced_step_copy_insn fully
655 simulate the effect of PC-relative instructions (and return NULL)
656 on architectures that use software single-stepping.
658 In non-stop mode, we can have independent and simultaneous step
659 requests, so more than one thread may need to simultaneously step
660 over a breakpoint. The current implementation assumes there is
661 only one scratch space per process. In this case, we have to
662 serialize access to the scratch space. If thread A wants to step
663 over a breakpoint, but we are currently waiting for some other
664 thread to complete a displaced step, we leave thread A stopped and
665 place it in the displaced_step_request_queue. Whenever a displaced
666 step finishes, we pick the next thread in the queue and start a new
667 displaced step operation on it. See displaced_step_prepare and
668 displaced_step_fixup for details. */
670 /* If this is not null_ptid, this is the thread carrying out a
671 displaced single-step. This thread's state will require fixing up
672 once it has completed its step. */
673 static ptid_t displaced_step_ptid
;
675 struct displaced_step_request
678 struct displaced_step_request
*next
;
681 /* A queue of pending displaced stepping requests. */
682 struct displaced_step_request
*displaced_step_request_queue
;
684 /* The architecture the thread had when we stepped it. */
685 static struct gdbarch
*displaced_step_gdbarch
;
687 /* The closure provided gdbarch_displaced_step_copy_insn, to be used
688 for post-step cleanup. */
689 static struct displaced_step_closure
*displaced_step_closure
;
691 /* The address of the original instruction, and the copy we made. */
692 static CORE_ADDR displaced_step_original
, displaced_step_copy
;
694 /* Saved contents of copy area. */
695 static gdb_byte
*displaced_step_saved_copy
;
697 /* Enum strings for "set|show displaced-stepping". */
699 static const char can_use_displaced_stepping_auto
[] = "auto";
700 static const char can_use_displaced_stepping_on
[] = "on";
701 static const char can_use_displaced_stepping_off
[] = "off";
702 static const char *can_use_displaced_stepping_enum
[] =
704 can_use_displaced_stepping_auto
,
705 can_use_displaced_stepping_on
,
706 can_use_displaced_stepping_off
,
710 /* If ON, and the architecture supports it, GDB will use displaced
711 stepping to step over breakpoints. If OFF, or if the architecture
712 doesn't support it, GDB will instead use the traditional
713 hold-and-step approach. If AUTO (which is the default), GDB will
714 decide which technique to use to step over breakpoints depending on
715 which of all-stop or non-stop mode is active --- displaced stepping
716 in non-stop mode; hold-and-step in all-stop mode. */
718 static const char *can_use_displaced_stepping
=
719 can_use_displaced_stepping_auto
;
722 show_can_use_displaced_stepping (struct ui_file
*file
, int from_tty
,
723 struct cmd_list_element
*c
,
726 if (can_use_displaced_stepping
== can_use_displaced_stepping_auto
)
727 fprintf_filtered (file
, _("\
728 Debugger's willingness to use displaced stepping to step over \
729 breakpoints is %s (currently %s).\n"),
730 value
, non_stop
? "on" : "off");
732 fprintf_filtered (file
, _("\
733 Debugger's willingness to use displaced stepping to step over \
734 breakpoints is %s.\n"), value
);
737 /* Return non-zero if displaced stepping can/should be used to step
741 use_displaced_stepping (struct gdbarch
*gdbarch
)
743 return (((can_use_displaced_stepping
== can_use_displaced_stepping_auto
745 || can_use_displaced_stepping
== can_use_displaced_stepping_on
)
746 && gdbarch_displaced_step_copy_insn_p (gdbarch
)
750 /* Clean out any stray displaced stepping state. */
752 displaced_step_clear (void)
754 /* Indicate that there is no cleanup pending. */
755 displaced_step_ptid
= null_ptid
;
757 if (displaced_step_closure
)
759 gdbarch_displaced_step_free_closure (displaced_step_gdbarch
,
760 displaced_step_closure
);
761 displaced_step_closure
= NULL
;
766 displaced_step_clear_cleanup (void *ignore
)
768 displaced_step_clear ();
771 /* Dump LEN bytes at BUF in hex to FILE, followed by a newline. */
773 displaced_step_dump_bytes (struct ui_file
*file
,
779 for (i
= 0; i
< len
; i
++)
780 fprintf_unfiltered (file
, "%02x ", buf
[i
]);
781 fputs_unfiltered ("\n", file
);
784 /* Prepare to single-step, using displaced stepping.
786 Note that we cannot use displaced stepping when we have a signal to
787 deliver. If we have a signal to deliver and an instruction to step
788 over, then after the step, there will be no indication from the
789 target whether the thread entered a signal handler or ignored the
790 signal and stepped over the instruction successfully --- both cases
791 result in a simple SIGTRAP. In the first case we mustn't do a
792 fixup, and in the second case we must --- but we can't tell which.
793 Comments in the code for 'random signals' in handle_inferior_event
794 explain how we handle this case instead.
796 Returns 1 if preparing was successful -- this thread is going to be
797 stepped now; or 0 if displaced stepping this thread got queued. */
799 displaced_step_prepare (ptid_t ptid
)
801 struct cleanup
*old_cleanups
, *ignore_cleanups
;
802 struct regcache
*regcache
= get_thread_regcache (ptid
);
803 struct gdbarch
*gdbarch
= get_regcache_arch (regcache
);
804 CORE_ADDR original
, copy
;
806 struct displaced_step_closure
*closure
;
808 /* We should never reach this function if the architecture does not
809 support displaced stepping. */
810 gdb_assert (gdbarch_displaced_step_copy_insn_p (gdbarch
));
812 /* For the first cut, we're displaced stepping one thread at a
815 if (!ptid_equal (displaced_step_ptid
, null_ptid
))
817 /* Already waiting for a displaced step to finish. Defer this
818 request and place in queue. */
819 struct displaced_step_request
*req
, *new_req
;
822 fprintf_unfiltered (gdb_stdlog
,
823 "displaced: defering step of %s\n",
824 target_pid_to_str (ptid
));
826 new_req
= xmalloc (sizeof (*new_req
));
827 new_req
->ptid
= ptid
;
828 new_req
->next
= NULL
;
830 if (displaced_step_request_queue
)
832 for (req
= displaced_step_request_queue
;
839 displaced_step_request_queue
= new_req
;
846 fprintf_unfiltered (gdb_stdlog
,
847 "displaced: stepping %s now\n",
848 target_pid_to_str (ptid
));
851 displaced_step_clear ();
853 old_cleanups
= save_inferior_ptid ();
854 inferior_ptid
= ptid
;
856 original
= regcache_read_pc (regcache
);
858 copy
= gdbarch_displaced_step_location (gdbarch
);
859 len
= gdbarch_max_insn_length (gdbarch
);
861 /* Save the original contents of the copy area. */
862 displaced_step_saved_copy
= xmalloc (len
);
863 ignore_cleanups
= make_cleanup (free_current_contents
,
864 &displaced_step_saved_copy
);
865 read_memory (copy
, displaced_step_saved_copy
, len
);
868 fprintf_unfiltered (gdb_stdlog
, "displaced: saved 0x%s: ",
870 displaced_step_dump_bytes (gdb_stdlog
, displaced_step_saved_copy
, len
);
873 closure
= gdbarch_displaced_step_copy_insn (gdbarch
,
874 original
, copy
, regcache
);
876 /* We don't support the fully-simulated case at present. */
877 gdb_assert (closure
);
879 /* Save the information we need to fix things up if the step
881 displaced_step_ptid
= ptid
;
882 displaced_step_gdbarch
= gdbarch
;
883 displaced_step_closure
= closure
;
884 displaced_step_original
= original
;
885 displaced_step_copy
= copy
;
887 make_cleanup (displaced_step_clear_cleanup
, 0);
889 /* Resume execution at the copy. */
890 regcache_write_pc (regcache
, copy
);
892 discard_cleanups (ignore_cleanups
);
894 do_cleanups (old_cleanups
);
897 fprintf_unfiltered (gdb_stdlog
, "displaced: displaced pc to 0x%s\n",
904 write_memory_ptid (ptid_t ptid
, CORE_ADDR memaddr
, const gdb_byte
*myaddr
, int len
)
906 struct cleanup
*ptid_cleanup
= save_inferior_ptid ();
907 inferior_ptid
= ptid
;
908 write_memory (memaddr
, myaddr
, len
);
909 do_cleanups (ptid_cleanup
);
913 displaced_step_fixup (ptid_t event_ptid
, enum target_signal signal
)
915 struct cleanup
*old_cleanups
;
917 /* Was this event for the pid we displaced? */
918 if (ptid_equal (displaced_step_ptid
, null_ptid
)
919 || ! ptid_equal (displaced_step_ptid
, event_ptid
))
922 old_cleanups
= make_cleanup (displaced_step_clear_cleanup
, 0);
924 /* Restore the contents of the copy area. */
926 ULONGEST len
= gdbarch_max_insn_length (displaced_step_gdbarch
);
927 write_memory_ptid (displaced_step_ptid
, displaced_step_copy
,
928 displaced_step_saved_copy
, len
);
930 fprintf_unfiltered (gdb_stdlog
, "displaced: restored 0x%s\n",
931 paddr_nz (displaced_step_copy
));
934 /* Did the instruction complete successfully? */
935 if (signal
== TARGET_SIGNAL_TRAP
)
937 /* Fix up the resulting state. */
938 gdbarch_displaced_step_fixup (displaced_step_gdbarch
,
939 displaced_step_closure
,
940 displaced_step_original
,
942 get_thread_regcache (displaced_step_ptid
));
946 /* Since the instruction didn't complete, all we can do is
948 struct regcache
*regcache
= get_thread_regcache (event_ptid
);
949 CORE_ADDR pc
= regcache_read_pc (regcache
);
950 pc
= displaced_step_original
+ (pc
- displaced_step_copy
);
951 regcache_write_pc (regcache
, pc
);
954 do_cleanups (old_cleanups
);
956 displaced_step_ptid
= null_ptid
;
958 /* Are there any pending displaced stepping requests? If so, run
960 while (displaced_step_request_queue
)
962 struct displaced_step_request
*head
;
966 head
= displaced_step_request_queue
;
968 displaced_step_request_queue
= head
->next
;
971 context_switch (ptid
);
973 actual_pc
= regcache_read_pc (get_thread_regcache (ptid
));
975 if (breakpoint_here_p (actual_pc
))
978 fprintf_unfiltered (gdb_stdlog
,
979 "displaced: stepping queued %s now\n",
980 target_pid_to_str (ptid
));
982 displaced_step_prepare (ptid
);
988 fprintf_unfiltered (gdb_stdlog
, "displaced: run 0x%s: ",
989 paddr_nz (actual_pc
));
990 read_memory (actual_pc
, buf
, sizeof (buf
));
991 displaced_step_dump_bytes (gdb_stdlog
, buf
, sizeof (buf
));
994 target_resume (ptid
, 1, TARGET_SIGNAL_0
);
996 /* Done, we're stepping a thread. */
1002 struct thread_info
*tp
= inferior_thread ();
1004 /* The breakpoint we were sitting under has since been
1006 tp
->trap_expected
= 0;
1008 /* Go back to what we were trying to do. */
1009 step
= currently_stepping (tp
);
1011 if (debug_displaced
)
1012 fprintf_unfiltered (gdb_stdlog
, "breakpoint is gone %s: step(%d)\n",
1013 target_pid_to_str (tp
->ptid
), step
);
1015 target_resume (ptid
, step
, TARGET_SIGNAL_0
);
1016 tp
->stop_signal
= TARGET_SIGNAL_0
;
1018 /* This request was discarded. See if there's any other
1019 thread waiting for its turn. */
1024 /* Update global variables holding ptids to hold NEW_PTID if they were
1025 holding OLD_PTID. */
1027 infrun_thread_ptid_changed (ptid_t old_ptid
, ptid_t new_ptid
)
1029 struct displaced_step_request
*it
;
1031 if (ptid_equal (inferior_ptid
, old_ptid
))
1032 inferior_ptid
= new_ptid
;
1034 if (ptid_equal (singlestep_ptid
, old_ptid
))
1035 singlestep_ptid
= new_ptid
;
1037 if (ptid_equal (displaced_step_ptid
, old_ptid
))
1038 displaced_step_ptid
= new_ptid
;
1040 if (ptid_equal (deferred_step_ptid
, old_ptid
))
1041 deferred_step_ptid
= new_ptid
;
1043 for (it
= displaced_step_request_queue
; it
; it
= it
->next
)
1044 if (ptid_equal (it
->ptid
, old_ptid
))
1045 it
->ptid
= new_ptid
;
1051 /* Things to clean up if we QUIT out of resume (). */
1053 resume_cleanups (void *ignore
)
1058 static const char schedlock_off
[] = "off";
1059 static const char schedlock_on
[] = "on";
1060 static const char schedlock_step
[] = "step";
1061 static const char *scheduler_enums
[] = {
1067 static const char *scheduler_mode
= schedlock_off
;
1069 show_scheduler_mode (struct ui_file
*file
, int from_tty
,
1070 struct cmd_list_element
*c
, const char *value
)
1072 fprintf_filtered (file
, _("\
1073 Mode for locking scheduler during execution is \"%s\".\n"),
1078 set_schedlock_func (char *args
, int from_tty
, struct cmd_list_element
*c
)
1080 if (!target_can_lock_scheduler
)
1082 scheduler_mode
= schedlock_off
;
1083 error (_("Target '%s' cannot support this command."), target_shortname
);
1087 /* True if execution commands resume all threads of all processes by
1088 default; otherwise, resume only threads of the current inferior
1090 int sched_multi
= 0;
1092 /* Try to setup for software single stepping over the specified location.
1093 Return 1 if target_resume() should use hardware single step.
1095 GDBARCH the current gdbarch.
1096 PC the location to step over. */
1099 maybe_software_singlestep (struct gdbarch
*gdbarch
, CORE_ADDR pc
)
1103 if (gdbarch_software_single_step_p (gdbarch
)
1104 && gdbarch_software_single_step (gdbarch
, get_current_frame ()))
1107 /* Do not pull these breakpoints until after a `wait' in
1108 `wait_for_inferior' */
1109 singlestep_breakpoints_inserted_p
= 1;
1110 singlestep_ptid
= inferior_ptid
;
1116 /* Resume the inferior, but allow a QUIT. This is useful if the user
1117 wants to interrupt some lengthy single-stepping operation
1118 (for child processes, the SIGINT goes to the inferior, and so
1119 we get a SIGINT random_signal, but for remote debugging and perhaps
1120 other targets, that's not true).
1122 STEP nonzero if we should step (zero to continue instead).
1123 SIG is the signal to give the inferior (zero for none). */
1125 resume (int step
, enum target_signal sig
)
1127 int should_resume
= 1;
1128 struct cleanup
*old_cleanups
= make_cleanup (resume_cleanups
, 0);
1129 struct regcache
*regcache
= get_current_regcache ();
1130 struct gdbarch
*gdbarch
= get_regcache_arch (regcache
);
1131 struct thread_info
*tp
= inferior_thread ();
1132 CORE_ADDR pc
= regcache_read_pc (regcache
);
1137 fprintf_unfiltered (gdb_stdlog
,
1138 "infrun: resume (step=%d, signal=%d), "
1139 "trap_expected=%d\n",
1140 step
, sig
, tp
->trap_expected
);
1142 /* Some targets (e.g. Solaris x86) have a kernel bug when stepping
1143 over an instruction that causes a page fault without triggering
1144 a hardware watchpoint. The kernel properly notices that it shouldn't
1145 stop, because the hardware watchpoint is not triggered, but it forgets
1146 the step request and continues the program normally.
1147 Work around the problem by removing hardware watchpoints if a step is
1148 requested, GDB will check for a hardware watchpoint trigger after the
1150 if (CANNOT_STEP_HW_WATCHPOINTS
&& step
)
1151 remove_hw_watchpoints ();
1154 /* Normally, by the time we reach `resume', the breakpoints are either
1155 removed or inserted, as appropriate. The exception is if we're sitting
1156 at a permanent breakpoint; we need to step over it, but permanent
1157 breakpoints can't be removed. So we have to test for it here. */
1158 if (breakpoint_here_p (pc
) == permanent_breakpoint_here
)
1160 if (gdbarch_skip_permanent_breakpoint_p (gdbarch
))
1161 gdbarch_skip_permanent_breakpoint (gdbarch
, regcache
);
1164 The program is stopped at a permanent breakpoint, but GDB does not know\n\
1165 how to step past a permanent breakpoint on this architecture. Try using\n\
1166 a command like `return' or `jump' to continue execution."));
1169 /* If enabled, step over breakpoints by executing a copy of the
1170 instruction at a different address.
1172 We can't use displaced stepping when we have a signal to deliver;
1173 the comments for displaced_step_prepare explain why. The
1174 comments in the handle_inferior event for dealing with 'random
1175 signals' explain what we do instead. */
1176 if (use_displaced_stepping (gdbarch
)
1177 && tp
->trap_expected
1178 && sig
== TARGET_SIGNAL_0
)
1180 if (!displaced_step_prepare (inferior_ptid
))
1182 /* Got placed in displaced stepping queue. Will be resumed
1183 later when all the currently queued displaced stepping
1184 requests finish. The thread is not executing at this point,
1185 and the call to set_executing will be made later. But we
1186 need to call set_running here, since from frontend point of view,
1187 the thread is running. */
1188 set_running (inferior_ptid
, 1);
1189 discard_cleanups (old_cleanups
);
1194 /* Do we need to do it the hard way, w/temp breakpoints? */
1196 step
= maybe_software_singlestep (gdbarch
, pc
);
1202 /* If STEP is set, it's a request to use hardware stepping
1203 facilities. But in that case, we should never
1204 use singlestep breakpoint. */
1205 gdb_assert (!(singlestep_breakpoints_inserted_p
&& step
));
1207 /* Decide the set of threads to ask the target to resume. Start
1208 by assuming everything will be resumed, than narrow the set
1209 by applying increasingly restricting conditions. */
1211 /* By default, resume all threads of all processes. */
1212 resume_ptid
= RESUME_ALL
;
1214 /* Maybe resume only all threads of the current process. */
1215 if (!sched_multi
&& target_supports_multi_process ())
1217 resume_ptid
= pid_to_ptid (ptid_get_pid (inferior_ptid
));
1220 /* Maybe resume a single thread after all. */
1221 if (singlestep_breakpoints_inserted_p
1222 && stepping_past_singlestep_breakpoint
)
1224 /* The situation here is as follows. In thread T1 we wanted to
1225 single-step. Lacking hardware single-stepping we've
1226 set breakpoint at the PC of the next instruction -- call it
1227 P. After resuming, we've hit that breakpoint in thread T2.
1228 Now we've removed original breakpoint, inserted breakpoint
1229 at P+1, and try to step to advance T2 past breakpoint.
1230 We need to step only T2, as if T1 is allowed to freely run,
1231 it can run past P, and if other threads are allowed to run,
1232 they can hit breakpoint at P+1, and nested hits of single-step
1233 breakpoints is not something we'd want -- that's complicated
1234 to support, and has no value. */
1235 resume_ptid
= inferior_ptid
;
1237 else if ((step
|| singlestep_breakpoints_inserted_p
)
1238 && tp
->trap_expected
)
1240 /* We're allowing a thread to run past a breakpoint it has
1241 hit, by single-stepping the thread with the breakpoint
1242 removed. In which case, we need to single-step only this
1243 thread, and keep others stopped, as they can miss this
1244 breakpoint if allowed to run.
1246 The current code actually removes all breakpoints when
1247 doing this, not just the one being stepped over, so if we
1248 let other threads run, we can actually miss any
1249 breakpoint, not just the one at PC. */
1250 resume_ptid
= inferior_ptid
;
1254 /* With non-stop mode on, threads are always handled
1256 resume_ptid
= inferior_ptid
;
1258 else if ((scheduler_mode
== schedlock_on
)
1259 || (scheduler_mode
== schedlock_step
1260 && (step
|| singlestep_breakpoints_inserted_p
)))
1262 /* User-settable 'scheduler' mode requires solo thread resume. */
1263 resume_ptid
= inferior_ptid
;
1266 if (gdbarch_cannot_step_breakpoint (gdbarch
))
1268 /* Most targets can step a breakpoint instruction, thus
1269 executing it normally. But if this one cannot, just
1270 continue and we will hit it anyway. */
1271 if (step
&& breakpoint_inserted_here_p (pc
))
1276 && use_displaced_stepping (gdbarch
)
1277 && tp
->trap_expected
)
1279 struct regcache
*resume_regcache
= get_thread_regcache (resume_ptid
);
1280 CORE_ADDR actual_pc
= regcache_read_pc (resume_regcache
);
1283 fprintf_unfiltered (gdb_stdlog
, "displaced: run 0x%s: ",
1284 paddr_nz (actual_pc
));
1285 read_memory (actual_pc
, buf
, sizeof (buf
));
1286 displaced_step_dump_bytes (gdb_stdlog
, buf
, sizeof (buf
));
1289 /* Install inferior's terminal modes. */
1290 target_terminal_inferior ();
1292 /* Avoid confusing the next resume, if the next stop/resume
1293 happens to apply to another thread. */
1294 tp
->stop_signal
= TARGET_SIGNAL_0
;
1296 target_resume (resume_ptid
, step
, sig
);
1299 discard_cleanups (old_cleanups
);
1304 /* Clear out all variables saying what to do when inferior is continued.
1305 First do this, then set the ones you want, then call `proceed'. */
1308 clear_proceed_status_thread (struct thread_info
*tp
)
1311 fprintf_unfiltered (gdb_stdlog
,
1312 "infrun: clear_proceed_status_thread (%s)\n",
1313 target_pid_to_str (tp
->ptid
));
1315 tp
->trap_expected
= 0;
1316 tp
->step_range_start
= 0;
1317 tp
->step_range_end
= 0;
1318 tp
->step_frame_id
= null_frame_id
;
1319 tp
->step_over_calls
= STEP_OVER_UNDEBUGGABLE
;
1320 tp
->stop_requested
= 0;
1324 tp
->proceed_to_finish
= 0;
1326 /* Discard any remaining commands or status from previous stop. */
1327 bpstat_clear (&tp
->stop_bpstat
);
1331 clear_proceed_status_callback (struct thread_info
*tp
, void *data
)
1333 if (is_exited (tp
->ptid
))
1336 clear_proceed_status_thread (tp
);
1341 clear_proceed_status (void)
1343 if (!ptid_equal (inferior_ptid
, null_ptid
))
1345 struct inferior
*inferior
;
1349 /* If in non-stop mode, only delete the per-thread status
1350 of the current thread. */
1351 clear_proceed_status_thread (inferior_thread ());
1355 /* In all-stop mode, delete the per-thread status of
1357 iterate_over_threads (clear_proceed_status_callback
, NULL
);
1360 inferior
= current_inferior ();
1361 inferior
->stop_soon
= NO_STOP_QUIETLY
;
1364 stop_after_trap
= 0;
1366 observer_notify_about_to_proceed ();
1370 regcache_xfree (stop_registers
);
1371 stop_registers
= NULL
;
1375 /* Check the current thread against the thread that reported the most recent
1376 event. If a step-over is required return TRUE and set the current thread
1377 to the old thread. Otherwise return FALSE.
1379 This should be suitable for any targets that support threads. */
1382 prepare_to_proceed (int step
)
1385 struct target_waitstatus wait_status
;
1386 int schedlock_enabled
;
1388 /* With non-stop mode on, threads are always handled individually. */
1389 gdb_assert (! non_stop
);
1391 /* Get the last target status returned by target_wait(). */
1392 get_last_target_status (&wait_ptid
, &wait_status
);
1394 /* Make sure we were stopped at a breakpoint. */
1395 if (wait_status
.kind
!= TARGET_WAITKIND_STOPPED
1396 || wait_status
.value
.sig
!= TARGET_SIGNAL_TRAP
)
1401 schedlock_enabled
= (scheduler_mode
== schedlock_on
1402 || (scheduler_mode
== schedlock_step
1405 /* Don't switch over to WAIT_PTID if scheduler locking is on. */
1406 if (schedlock_enabled
)
1409 /* Don't switch over if we're about to resume some other process
1410 other than WAIT_PTID's, and schedule-multiple is off. */
1412 && ptid_get_pid (wait_ptid
) != ptid_get_pid (inferior_ptid
))
1415 /* Switched over from WAIT_PID. */
1416 if (!ptid_equal (wait_ptid
, minus_one_ptid
)
1417 && !ptid_equal (inferior_ptid
, wait_ptid
))
1419 struct regcache
*regcache
= get_thread_regcache (wait_ptid
);
1421 if (breakpoint_here_p (regcache_read_pc (regcache
)))
1423 /* If stepping, remember current thread to switch back to. */
1425 deferred_step_ptid
= inferior_ptid
;
1427 /* Switch back to WAIT_PID thread. */
1428 switch_to_thread (wait_ptid
);
1430 /* We return 1 to indicate that there is a breakpoint here,
1431 so we need to step over it before continuing to avoid
1432 hitting it straight away. */
1440 /* Basic routine for continuing the program in various fashions.
1442 ADDR is the address to resume at, or -1 for resume where stopped.
1443 SIGGNAL is the signal to give it, or 0 for none,
1444 or -1 for act according to how it stopped.
1445 STEP is nonzero if should trap after one instruction.
1446 -1 means return after that and print nothing.
1447 You should probably set various step_... variables
1448 before calling here, if you are stepping.
1450 You should call clear_proceed_status before calling proceed. */
1453 proceed (CORE_ADDR addr
, enum target_signal siggnal
, int step
)
1455 struct regcache
*regcache
;
1456 struct gdbarch
*gdbarch
;
1457 struct thread_info
*tp
;
1461 /* If we're stopped at a fork/vfork, follow the branch set by the
1462 "set follow-fork-mode" command; otherwise, we'll just proceed
1463 resuming the current thread. */
1464 if (!follow_fork ())
1466 /* The target for some reason decided not to resume. */
1471 regcache
= get_current_regcache ();
1472 gdbarch
= get_regcache_arch (regcache
);
1473 pc
= regcache_read_pc (regcache
);
1476 step_start_function
= find_pc_function (pc
);
1478 stop_after_trap
= 1;
1480 if (addr
== (CORE_ADDR
) -1)
1482 if (pc
== stop_pc
&& breakpoint_here_p (pc
)
1483 && execution_direction
!= EXEC_REVERSE
)
1484 /* There is a breakpoint at the address we will resume at,
1485 step one instruction before inserting breakpoints so that
1486 we do not stop right away (and report a second hit at this
1489 Note, we don't do this in reverse, because we won't
1490 actually be executing the breakpoint insn anyway.
1491 We'll be (un-)executing the previous instruction. */
1494 else if (gdbarch_single_step_through_delay_p (gdbarch
)
1495 && gdbarch_single_step_through_delay (gdbarch
,
1496 get_current_frame ()))
1497 /* We stepped onto an instruction that needs to be stepped
1498 again before re-inserting the breakpoint, do so. */
1503 regcache_write_pc (regcache
, addr
);
1507 fprintf_unfiltered (gdb_stdlog
,
1508 "infrun: proceed (addr=0x%s, signal=%d, step=%d)\n",
1509 paddr_nz (addr
), siggnal
, step
);
1512 /* In non-stop, each thread is handled individually. The context
1513 must already be set to the right thread here. */
1517 /* In a multi-threaded task we may select another thread and
1518 then continue or step.
1520 But if the old thread was stopped at a breakpoint, it will
1521 immediately cause another breakpoint stop without any
1522 execution (i.e. it will report a breakpoint hit incorrectly).
1523 So we must step over it first.
1525 prepare_to_proceed checks the current thread against the
1526 thread that reported the most recent event. If a step-over
1527 is required it returns TRUE and sets the current thread to
1529 if (prepare_to_proceed (step
))
1533 /* prepare_to_proceed may change the current thread. */
1534 tp
= inferior_thread ();
1538 tp
->trap_expected
= 1;
1539 /* If displaced stepping is enabled, we can step over the
1540 breakpoint without hitting it, so leave all breakpoints
1541 inserted. Otherwise we need to disable all breakpoints, step
1542 one instruction, and then re-add them when that step is
1544 if (!use_displaced_stepping (gdbarch
))
1545 remove_breakpoints ();
1548 /* We can insert breakpoints if we're not trying to step over one,
1549 or if we are stepping over one but we're using displaced stepping
1551 if (! tp
->trap_expected
|| use_displaced_stepping (gdbarch
))
1552 insert_breakpoints ();
1556 /* Pass the last stop signal to the thread we're resuming,
1557 irrespective of whether the current thread is the thread that
1558 got the last event or not. This was historically GDB's
1559 behaviour before keeping a stop_signal per thread. */
1561 struct thread_info
*last_thread
;
1563 struct target_waitstatus last_status
;
1565 get_last_target_status (&last_ptid
, &last_status
);
1566 if (!ptid_equal (inferior_ptid
, last_ptid
)
1567 && !ptid_equal (last_ptid
, null_ptid
)
1568 && !ptid_equal (last_ptid
, minus_one_ptid
))
1570 last_thread
= find_thread_ptid (last_ptid
);
1573 tp
->stop_signal
= last_thread
->stop_signal
;
1574 last_thread
->stop_signal
= TARGET_SIGNAL_0
;
1579 if (siggnal
!= TARGET_SIGNAL_DEFAULT
)
1580 tp
->stop_signal
= siggnal
;
1581 /* If this signal should not be seen by program,
1582 give it zero. Used for debugging signals. */
1583 else if (!signal_program
[tp
->stop_signal
])
1584 tp
->stop_signal
= TARGET_SIGNAL_0
;
1586 annotate_starting ();
1588 /* Make sure that output from GDB appears before output from the
1590 gdb_flush (gdb_stdout
);
1592 /* Refresh prev_pc value just prior to resuming. This used to be
1593 done in stop_stepping, however, setting prev_pc there did not handle
1594 scenarios such as inferior function calls or returning from
1595 a function via the return command. In those cases, the prev_pc
1596 value was not set properly for subsequent commands. The prev_pc value
1597 is used to initialize the starting line number in the ecs. With an
1598 invalid value, the gdb next command ends up stopping at the position
1599 represented by the next line table entry past our start position.
1600 On platforms that generate one line table entry per line, this
1601 is not a problem. However, on the ia64, the compiler generates
1602 extraneous line table entries that do not increase the line number.
1603 When we issue the gdb next command on the ia64 after an inferior call
1604 or a return command, we often end up a few instructions forward, still
1605 within the original line we started.
1607 An attempt was made to have init_execution_control_state () refresh
1608 the prev_pc value before calculating the line number. This approach
1609 did not work because on platforms that use ptrace, the pc register
1610 cannot be read unless the inferior is stopped. At that point, we
1611 are not guaranteed the inferior is stopped and so the regcache_read_pc ()
1612 call can fail. Setting the prev_pc value here ensures the value is
1613 updated correctly when the inferior is stopped. */
1614 tp
->prev_pc
= regcache_read_pc (get_current_regcache ());
1616 /* Fill in with reasonable starting values. */
1617 init_thread_stepping_state (tp
);
1619 /* Reset to normal state. */
1620 init_infwait_state ();
1622 /* Resume inferior. */
1623 resume (oneproc
|| step
|| bpstat_should_step (), tp
->stop_signal
);
1625 /* Wait for it to stop (if not standalone)
1626 and in any case decode why it stopped, and act accordingly. */
1627 /* Do this only if we are not using the event loop, or if the target
1628 does not support asynchronous execution. */
1629 if (!target_can_async_p ())
1631 wait_for_inferior (0);
1637 /* Start remote-debugging of a machine over a serial link. */
1640 start_remote (int from_tty
)
1642 struct inferior
*inferior
;
1643 init_wait_for_inferior ();
1645 inferior
= current_inferior ();
1646 inferior
->stop_soon
= STOP_QUIETLY_REMOTE
;
1648 /* Always go on waiting for the target, regardless of the mode. */
1649 /* FIXME: cagney/1999-09-23: At present it isn't possible to
1650 indicate to wait_for_inferior that a target should timeout if
1651 nothing is returned (instead of just blocking). Because of this,
1652 targets expecting an immediate response need to, internally, set
1653 things up so that the target_wait() is forced to eventually
1655 /* FIXME: cagney/1999-09-24: It isn't possible for target_open() to
1656 differentiate to its caller what the state of the target is after
1657 the initial open has been performed. Here we're assuming that
1658 the target has stopped. It should be possible to eventually have
1659 target_open() return to the caller an indication that the target
1660 is currently running and GDB state should be set to the same as
1661 for an async run. */
1662 wait_for_inferior (0);
1664 /* Now that the inferior has stopped, do any bookkeeping like
1665 loading shared libraries. We want to do this before normal_stop,
1666 so that the displayed frame is up to date. */
1667 post_create_inferior (¤t_target
, from_tty
);
1672 /* Initialize static vars when a new inferior begins. */
1675 init_wait_for_inferior (void)
1677 /* These are meaningless until the first time through wait_for_inferior. */
1679 breakpoint_init_inferior (inf_starting
);
1681 clear_proceed_status ();
1683 stepping_past_singlestep_breakpoint
= 0;
1684 deferred_step_ptid
= null_ptid
;
1686 target_last_wait_ptid
= minus_one_ptid
;
1688 previous_inferior_ptid
= null_ptid
;
1689 init_infwait_state ();
1691 displaced_step_clear ();
1695 /* This enum encodes possible reasons for doing a target_wait, so that
1696 wfi can call target_wait in one place. (Ultimately the call will be
1697 moved out of the infinite loop entirely.) */
1701 infwait_normal_state
,
1702 infwait_thread_hop_state
,
1703 infwait_step_watch_state
,
1704 infwait_nonstep_watch_state
1707 /* Why did the inferior stop? Used to print the appropriate messages
1708 to the interface from within handle_inferior_event(). */
1709 enum inferior_stop_reason
1711 /* Step, next, nexti, stepi finished. */
1713 /* Inferior terminated by signal. */
1715 /* Inferior exited. */
1717 /* Inferior received signal, and user asked to be notified. */
1719 /* Reverse execution -- target ran out of history info. */
1723 /* The PTID we'll do a target_wait on.*/
1726 /* Current inferior wait state. */
1727 enum infwait_states infwait_state
;
1729 /* Data to be passed around while handling an event. This data is
1730 discarded between events. */
1731 struct execution_control_state
1734 /* The thread that got the event, if this was a thread event; NULL
1736 struct thread_info
*event_thread
;
1738 struct target_waitstatus ws
;
1740 CORE_ADDR stop_func_start
;
1741 CORE_ADDR stop_func_end
;
1742 char *stop_func_name
;
1743 int new_thread_event
;
1747 void init_execution_control_state (struct execution_control_state
*ecs
);
1749 void handle_inferior_event (struct execution_control_state
*ecs
);
1751 static void handle_step_into_function (struct gdbarch
*gdbarch
,
1752 struct execution_control_state
*ecs
);
1753 static void handle_step_into_function_backward (struct gdbarch
*gdbarch
,
1754 struct execution_control_state
*ecs
);
1755 static void insert_step_resume_breakpoint_at_frame (struct frame_info
*step_frame
);
1756 static void insert_step_resume_breakpoint_at_caller (struct frame_info
*);
1757 static void insert_step_resume_breakpoint_at_sal (struct symtab_and_line sr_sal
,
1758 struct frame_id sr_id
);
1759 static void insert_longjmp_resume_breakpoint (CORE_ADDR
);
1761 static void stop_stepping (struct execution_control_state
*ecs
);
1762 static void prepare_to_wait (struct execution_control_state
*ecs
);
1763 static void keep_going (struct execution_control_state
*ecs
);
1764 static void print_stop_reason (enum inferior_stop_reason stop_reason
,
1767 /* Callback for iterate over threads. If the thread is stopped, but
1768 the user/frontend doesn't know about that yet, go through
1769 normal_stop, as if the thread had just stopped now. ARG points at
1770 a ptid. If PTID is MINUS_ONE_PTID, applies to all threads. If
1771 ptid_is_pid(PTID) is true, applies to all threads of the process
1772 pointed at by PTID. Otherwise, apply only to the thread pointed by
1776 infrun_thread_stop_requested_callback (struct thread_info
*info
, void *arg
)
1778 ptid_t ptid
= * (ptid_t
*) arg
;
1780 if ((ptid_equal (info
->ptid
, ptid
)
1781 || ptid_equal (minus_one_ptid
, ptid
)
1782 || (ptid_is_pid (ptid
)
1783 && ptid_get_pid (ptid
) == ptid_get_pid (info
->ptid
)))
1784 && is_running (info
->ptid
)
1785 && !is_executing (info
->ptid
))
1787 struct cleanup
*old_chain
;
1788 struct execution_control_state ecss
;
1789 struct execution_control_state
*ecs
= &ecss
;
1791 memset (ecs
, 0, sizeof (*ecs
));
1793 old_chain
= make_cleanup_restore_current_thread ();
1795 switch_to_thread (info
->ptid
);
1797 /* Go through handle_inferior_event/normal_stop, so we always
1798 have consistent output as if the stop event had been
1800 ecs
->ptid
= info
->ptid
;
1801 ecs
->event_thread
= find_thread_ptid (info
->ptid
);
1802 ecs
->ws
.kind
= TARGET_WAITKIND_STOPPED
;
1803 ecs
->ws
.value
.sig
= TARGET_SIGNAL_0
;
1805 handle_inferior_event (ecs
);
1807 if (!ecs
->wait_some_more
)
1809 struct thread_info
*tp
;
1813 /* Finish off the continuations. The continations
1814 themselves are responsible for realising the thread
1815 didn't finish what it was supposed to do. */
1816 tp
= inferior_thread ();
1817 do_all_intermediate_continuations_thread (tp
);
1818 do_all_continuations_thread (tp
);
1821 do_cleanups (old_chain
);
1827 /* This function is attached as a "thread_stop_requested" observer.
1828 Cleanup local state that assumed the PTID was to be resumed, and
1829 report the stop to the frontend. */
1832 infrun_thread_stop_requested (ptid_t ptid
)
1834 struct displaced_step_request
*it
, *next
, *prev
= NULL
;
1836 /* PTID was requested to stop. Remove it from the displaced
1837 stepping queue, so we don't try to resume it automatically. */
1838 for (it
= displaced_step_request_queue
; it
; it
= next
)
1842 if (ptid_equal (it
->ptid
, ptid
)
1843 || ptid_equal (minus_one_ptid
, ptid
)
1844 || (ptid_is_pid (ptid
)
1845 && ptid_get_pid (ptid
) == ptid_get_pid (it
->ptid
)))
1847 if (displaced_step_request_queue
== it
)
1848 displaced_step_request_queue
= it
->next
;
1850 prev
->next
= it
->next
;
1858 iterate_over_threads (infrun_thread_stop_requested_callback
, &ptid
);
1862 infrun_thread_thread_exit (struct thread_info
*tp
, int silent
)
1864 if (ptid_equal (target_last_wait_ptid
, tp
->ptid
))
1865 nullify_last_target_wait_ptid ();
1868 /* Callback for iterate_over_threads. */
1871 delete_step_resume_breakpoint_callback (struct thread_info
*info
, void *data
)
1873 if (is_exited (info
->ptid
))
1876 delete_step_resume_breakpoint (info
);
1880 /* In all-stop, delete the step resume breakpoint of any thread that
1881 had one. In non-stop, delete the step resume breakpoint of the
1882 thread that just stopped. */
1885 delete_step_thread_step_resume_breakpoint (void)
1887 if (!target_has_execution
1888 || ptid_equal (inferior_ptid
, null_ptid
))
1889 /* If the inferior has exited, we have already deleted the step
1890 resume breakpoints out of GDB's lists. */
1895 /* If in non-stop mode, only delete the step-resume or
1896 longjmp-resume breakpoint of the thread that just stopped
1898 struct thread_info
*tp
= inferior_thread ();
1899 delete_step_resume_breakpoint (tp
);
1902 /* In all-stop mode, delete all step-resume and longjmp-resume
1903 breakpoints of any thread that had them. */
1904 iterate_over_threads (delete_step_resume_breakpoint_callback
, NULL
);
1907 /* A cleanup wrapper. */
1910 delete_step_thread_step_resume_breakpoint_cleanup (void *arg
)
1912 delete_step_thread_step_resume_breakpoint ();
1915 /* Pretty print the results of target_wait, for debugging purposes. */
1918 print_target_wait_results (ptid_t waiton_ptid
, ptid_t result_ptid
,
1919 const struct target_waitstatus
*ws
)
1921 char *status_string
= target_waitstatus_to_string (ws
);
1922 struct ui_file
*tmp_stream
= mem_fileopen ();
1926 /* The text is split over several lines because it was getting too long.
1927 Call fprintf_unfiltered (gdb_stdlog) once so that the text is still
1928 output as a unit; we want only one timestamp printed if debug_timestamp
1931 fprintf_unfiltered (tmp_stream
,
1932 "infrun: target_wait (%d", PIDGET (waiton_ptid
));
1933 if (PIDGET (waiton_ptid
) != -1)
1934 fprintf_unfiltered (tmp_stream
,
1935 " [%s]", target_pid_to_str (waiton_ptid
));
1936 fprintf_unfiltered (tmp_stream
, ", status) =\n");
1937 fprintf_unfiltered (tmp_stream
,
1938 "infrun: %d [%s],\n",
1939 PIDGET (result_ptid
), target_pid_to_str (result_ptid
));
1940 fprintf_unfiltered (tmp_stream
,
1944 text
= ui_file_xstrdup (tmp_stream
, &len
);
1946 /* This uses %s in part to handle %'s in the text, but also to avoid
1947 a gcc error: the format attribute requires a string literal. */
1948 fprintf_unfiltered (gdb_stdlog
, "%s", text
);
1950 xfree (status_string
);
1952 ui_file_delete (tmp_stream
);
1955 /* Wait for control to return from inferior to debugger.
1957 If TREAT_EXEC_AS_SIGTRAP is non-zero, then handle EXEC signals
1958 as if they were SIGTRAP signals. This can be useful during
1959 the startup sequence on some targets such as HP/UX, where
1960 we receive an EXEC event instead of the expected SIGTRAP.
1962 If inferior gets a signal, we may decide to start it up again
1963 instead of returning. That is why there is a loop in this function.
1964 When this function actually returns it means the inferior
1965 should be left stopped and GDB should read more commands. */
1968 wait_for_inferior (int treat_exec_as_sigtrap
)
1970 struct cleanup
*old_cleanups
;
1971 struct execution_control_state ecss
;
1972 struct execution_control_state
*ecs
;
1976 (gdb_stdlog
, "infrun: wait_for_inferior (treat_exec_as_sigtrap=%d)\n",
1977 treat_exec_as_sigtrap
);
1980 make_cleanup (delete_step_thread_step_resume_breakpoint_cleanup
, NULL
);
1983 memset (ecs
, 0, sizeof (*ecs
));
1985 overlay_cache_invalid
= 1;
1987 /* We'll update this if & when we switch to a new thread. */
1988 previous_inferior_ptid
= inferior_ptid
;
1990 /* We have to invalidate the registers BEFORE calling target_wait
1991 because they can be loaded from the target while in target_wait.
1992 This makes remote debugging a bit more efficient for those
1993 targets that provide critical registers as part of their normal
1994 status mechanism. */
1996 registers_changed ();
2000 struct cleanup
*old_chain
;
2002 if (deprecated_target_wait_hook
)
2003 ecs
->ptid
= deprecated_target_wait_hook (waiton_ptid
, &ecs
->ws
, 0);
2005 ecs
->ptid
= target_wait (waiton_ptid
, &ecs
->ws
, 0);
2008 print_target_wait_results (waiton_ptid
, ecs
->ptid
, &ecs
->ws
);
2010 if (treat_exec_as_sigtrap
&& ecs
->ws
.kind
== TARGET_WAITKIND_EXECD
)
2012 xfree (ecs
->ws
.value
.execd_pathname
);
2013 ecs
->ws
.kind
= TARGET_WAITKIND_STOPPED
;
2014 ecs
->ws
.value
.sig
= TARGET_SIGNAL_TRAP
;
2017 /* If an error happens while handling the event, propagate GDB's
2018 knowledge of the executing state to the frontend/user running
2020 old_chain
= make_cleanup (finish_thread_state_cleanup
, &minus_one_ptid
);
2022 /* Now figure out what to do with the result of the result. */
2023 handle_inferior_event (ecs
);
2025 /* No error, don't finish the state yet. */
2026 discard_cleanups (old_chain
);
2028 if (!ecs
->wait_some_more
)
2032 do_cleanups (old_cleanups
);
2035 /* Asynchronous version of wait_for_inferior. It is called by the
2036 event loop whenever a change of state is detected on the file
2037 descriptor corresponding to the target. It can be called more than
2038 once to complete a single execution command. In such cases we need
2039 to keep the state in a global variable ECSS. If it is the last time
2040 that this function is called for a single execution command, then
2041 report to the user that the inferior has stopped, and do the
2042 necessary cleanups. */
2045 fetch_inferior_event (void *client_data
)
2047 struct execution_control_state ecss
;
2048 struct execution_control_state
*ecs
= &ecss
;
2049 struct cleanup
*old_chain
= make_cleanup (null_cleanup
, NULL
);
2050 struct cleanup
*ts_old_chain
;
2051 int was_sync
= sync_execution
;
2053 memset (ecs
, 0, sizeof (*ecs
));
2055 overlay_cache_invalid
= 1;
2057 /* We can only rely on wait_for_more being correct before handling
2058 the event in all-stop, but previous_inferior_ptid isn't used in
2060 if (!ecs
->wait_some_more
)
2061 /* We'll update this if & when we switch to a new thread. */
2062 previous_inferior_ptid
= inferior_ptid
;
2065 /* In non-stop mode, the user/frontend should not notice a thread
2066 switch due to internal events. Make sure we reverse to the
2067 user selected thread and frame after handling the event and
2068 running any breakpoint commands. */
2069 make_cleanup_restore_current_thread ();
2071 /* We have to invalidate the registers BEFORE calling target_wait
2072 because they can be loaded from the target while in target_wait.
2073 This makes remote debugging a bit more efficient for those
2074 targets that provide critical registers as part of their normal
2075 status mechanism. */
2077 registers_changed ();
2079 if (deprecated_target_wait_hook
)
2081 deprecated_target_wait_hook (waiton_ptid
, &ecs
->ws
, TARGET_WNOHANG
);
2083 ecs
->ptid
= target_wait (waiton_ptid
, &ecs
->ws
, TARGET_WNOHANG
);
2086 print_target_wait_results (waiton_ptid
, ecs
->ptid
, &ecs
->ws
);
2089 && ecs
->ws
.kind
!= TARGET_WAITKIND_IGNORE
2090 && ecs
->ws
.kind
!= TARGET_WAITKIND_EXITED
2091 && ecs
->ws
.kind
!= TARGET_WAITKIND_SIGNALLED
)
2092 /* In non-stop mode, each thread is handled individually. Switch
2093 early, so the global state is set correctly for this
2095 context_switch (ecs
->ptid
);
2097 /* If an error happens while handling the event, propagate GDB's
2098 knowledge of the executing state to the frontend/user running
2101 ts_old_chain
= make_cleanup (finish_thread_state_cleanup
, &minus_one_ptid
);
2103 ts_old_chain
= make_cleanup (finish_thread_state_cleanup
, &ecs
->ptid
);
2105 /* Now figure out what to do with the result of the result. */
2106 handle_inferior_event (ecs
);
2108 if (!ecs
->wait_some_more
)
2110 struct inferior
*inf
= find_inferior_pid (ptid_get_pid (ecs
->ptid
));
2112 delete_step_thread_step_resume_breakpoint ();
2114 /* We may not find an inferior if this was a process exit. */
2115 if (inf
== NULL
|| inf
->stop_soon
== NO_STOP_QUIETLY
)
2118 if (target_has_execution
2119 && ecs
->ws
.kind
!= TARGET_WAITKIND_EXITED
2120 && ecs
->ws
.kind
!= TARGET_WAITKIND_SIGNALLED
2121 && ecs
->event_thread
->step_multi
2122 && ecs
->event_thread
->stop_step
)
2123 inferior_event_handler (INF_EXEC_CONTINUE
, NULL
);
2125 inferior_event_handler (INF_EXEC_COMPLETE
, NULL
);
2128 /* No error, don't finish the thread states yet. */
2129 discard_cleanups (ts_old_chain
);
2131 /* Revert thread and frame. */
2132 do_cleanups (old_chain
);
2134 /* If the inferior was in sync execution mode, and now isn't,
2135 restore the prompt. */
2136 if (was_sync
&& !sync_execution
)
2137 display_gdb_prompt (0);
2140 /* Prepare an execution control state for looping through a
2141 wait_for_inferior-type loop. */
2144 init_execution_control_state (struct execution_control_state
*ecs
)
2146 ecs
->random_signal
= 0;
2149 /* Clear context switchable stepping state. */
2152 init_thread_stepping_state (struct thread_info
*tss
)
2154 struct symtab_and_line sal
;
2156 tss
->stepping_over_breakpoint
= 0;
2157 tss
->step_after_step_resume_breakpoint
= 0;
2158 tss
->stepping_through_solib_after_catch
= 0;
2159 tss
->stepping_through_solib_catchpoints
= NULL
;
2161 sal
= find_pc_line (tss
->prev_pc
, 0);
2162 tss
->current_line
= sal
.line
;
2163 tss
->current_symtab
= sal
.symtab
;
2166 /* Return the cached copy of the last pid/waitstatus returned by
2167 target_wait()/deprecated_target_wait_hook(). The data is actually
2168 cached by handle_inferior_event(), which gets called immediately
2169 after target_wait()/deprecated_target_wait_hook(). */
2172 get_last_target_status (ptid_t
*ptidp
, struct target_waitstatus
*status
)
2174 *ptidp
= target_last_wait_ptid
;
2175 *status
= target_last_waitstatus
;
2179 nullify_last_target_wait_ptid (void)
2181 target_last_wait_ptid
= minus_one_ptid
;
2184 /* Switch thread contexts. */
2187 context_switch (ptid_t ptid
)
2191 fprintf_unfiltered (gdb_stdlog
, "infrun: Switching context from %s ",
2192 target_pid_to_str (inferior_ptid
));
2193 fprintf_unfiltered (gdb_stdlog
, "to %s\n",
2194 target_pid_to_str (ptid
));
2197 switch_to_thread (ptid
);
2201 adjust_pc_after_break (struct execution_control_state
*ecs
)
2203 struct regcache
*regcache
;
2204 struct gdbarch
*gdbarch
;
2205 CORE_ADDR breakpoint_pc
;
2207 /* If we've hit a breakpoint, we'll normally be stopped with SIGTRAP. If
2208 we aren't, just return.
2210 We assume that waitkinds other than TARGET_WAITKIND_STOPPED are not
2211 affected by gdbarch_decr_pc_after_break. Other waitkinds which are
2212 implemented by software breakpoints should be handled through the normal
2215 NOTE drow/2004-01-31: On some targets, breakpoints may generate
2216 different signals (SIGILL or SIGEMT for instance), but it is less
2217 clear where the PC is pointing afterwards. It may not match
2218 gdbarch_decr_pc_after_break. I don't know any specific target that
2219 generates these signals at breakpoints (the code has been in GDB since at
2220 least 1992) so I can not guess how to handle them here.
2222 In earlier versions of GDB, a target with
2223 gdbarch_have_nonsteppable_watchpoint would have the PC after hitting a
2224 watchpoint affected by gdbarch_decr_pc_after_break. I haven't found any
2225 target with both of these set in GDB history, and it seems unlikely to be
2226 correct, so gdbarch_have_nonsteppable_watchpoint is not checked here. */
2228 if (ecs
->ws
.kind
!= TARGET_WAITKIND_STOPPED
)
2231 if (ecs
->ws
.value
.sig
!= TARGET_SIGNAL_TRAP
)
2234 /* In reverse execution, when a breakpoint is hit, the instruction
2235 under it has already been de-executed. The reported PC always
2236 points at the breakpoint address, so adjusting it further would
2237 be wrong. E.g., consider this case on a decr_pc_after_break == 1
2240 B1 0x08000000 : INSN1
2241 B2 0x08000001 : INSN2
2243 PC -> 0x08000003 : INSN4
2245 Say you're stopped at 0x08000003 as above. Reverse continuing
2246 from that point should hit B2 as below. Reading the PC when the
2247 SIGTRAP is reported should read 0x08000001 and INSN2 should have
2248 been de-executed already.
2250 B1 0x08000000 : INSN1
2251 B2 PC -> 0x08000001 : INSN2
2255 We can't apply the same logic as for forward execution, because
2256 we would wrongly adjust the PC to 0x08000000, since there's a
2257 breakpoint at PC - 1. We'd then report a hit on B1, although
2258 INSN1 hadn't been de-executed yet. Doing nothing is the correct
2260 if (execution_direction
== EXEC_REVERSE
)
2263 /* If this target does not decrement the PC after breakpoints, then
2264 we have nothing to do. */
2265 regcache
= get_thread_regcache (ecs
->ptid
);
2266 gdbarch
= get_regcache_arch (regcache
);
2267 if (gdbarch_decr_pc_after_break (gdbarch
) == 0)
2270 /* Find the location where (if we've hit a breakpoint) the
2271 breakpoint would be. */
2272 breakpoint_pc
= regcache_read_pc (regcache
)
2273 - gdbarch_decr_pc_after_break (gdbarch
);
2275 /* Check whether there actually is a software breakpoint inserted at
2278 If in non-stop mode, a race condition is possible where we've
2279 removed a breakpoint, but stop events for that breakpoint were
2280 already queued and arrive later. To suppress those spurious
2281 SIGTRAPs, we keep a list of such breakpoint locations for a bit,
2282 and retire them after a number of stop events are reported. */
2283 if (software_breakpoint_inserted_here_p (breakpoint_pc
)
2284 || (non_stop
&& moribund_breakpoint_here_p (breakpoint_pc
)))
2286 struct cleanup
*old_cleanups
= NULL
;
2288 old_cleanups
= record_gdb_operation_disable_set ();
2290 /* When using hardware single-step, a SIGTRAP is reported for both
2291 a completed single-step and a software breakpoint. Need to
2292 differentiate between the two, as the latter needs adjusting
2293 but the former does not.
2295 The SIGTRAP can be due to a completed hardware single-step only if
2296 - we didn't insert software single-step breakpoints
2297 - the thread to be examined is still the current thread
2298 - this thread is currently being stepped
2300 If any of these events did not occur, we must have stopped due
2301 to hitting a software breakpoint, and have to back up to the
2304 As a special case, we could have hardware single-stepped a
2305 software breakpoint. In this case (prev_pc == breakpoint_pc),
2306 we also need to back up to the breakpoint address. */
2308 if (singlestep_breakpoints_inserted_p
2309 || !ptid_equal (ecs
->ptid
, inferior_ptid
)
2310 || !currently_stepping (ecs
->event_thread
)
2311 || ecs
->event_thread
->prev_pc
== breakpoint_pc
)
2312 regcache_write_pc (regcache
, breakpoint_pc
);
2315 do_cleanups (old_cleanups
);
2320 init_infwait_state (void)
2322 waiton_ptid
= pid_to_ptid (-1);
2323 infwait_state
= infwait_normal_state
;
2327 error_is_running (void)
2330 Cannot execute this command while the selected thread is running."));
2334 ensure_not_running (void)
2336 if (is_running (inferior_ptid
))
2337 error_is_running ();
2340 /* Given an execution control state that has been freshly filled in
2341 by an event from the inferior, figure out what it means and take
2342 appropriate action. */
2345 handle_inferior_event (struct execution_control_state
*ecs
)
2347 struct frame_info
*frame
;
2348 struct gdbarch
*gdbarch
;
2349 int sw_single_step_trap_p
= 0;
2350 int stopped_by_watchpoint
;
2351 int stepped_after_stopped_by_watchpoint
= 0;
2352 struct symtab_and_line stop_pc_sal
;
2353 enum stop_kind stop_soon
;
2355 if (ecs
->ws
.kind
!= TARGET_WAITKIND_EXITED
2356 && ecs
->ws
.kind
!= TARGET_WAITKIND_SIGNALLED
2357 && ecs
->ws
.kind
!= TARGET_WAITKIND_IGNORE
)
2359 struct inferior
*inf
= find_inferior_pid (ptid_get_pid (ecs
->ptid
));
2361 stop_soon
= inf
->stop_soon
;
2364 stop_soon
= NO_STOP_QUIETLY
;
2366 /* Cache the last pid/waitstatus. */
2367 target_last_wait_ptid
= ecs
->ptid
;
2368 target_last_waitstatus
= ecs
->ws
;
2370 /* Always clear state belonging to the previous time we stopped. */
2371 stop_stack_dummy
= 0;
2373 /* If it's a new process, add it to the thread database */
2375 ecs
->new_thread_event
= (!ptid_equal (ecs
->ptid
, inferior_ptid
)
2376 && !ptid_equal (ecs
->ptid
, minus_one_ptid
)
2377 && !in_thread_list (ecs
->ptid
));
2379 if (ecs
->ws
.kind
!= TARGET_WAITKIND_EXITED
2380 && ecs
->ws
.kind
!= TARGET_WAITKIND_SIGNALLED
&& ecs
->new_thread_event
)
2381 add_thread (ecs
->ptid
);
2383 ecs
->event_thread
= find_thread_ptid (ecs
->ptid
);
2385 /* Dependent on valid ECS->EVENT_THREAD. */
2386 adjust_pc_after_break (ecs
);
2388 /* Dependent on the current PC value modified by adjust_pc_after_break. */
2389 reinit_frame_cache ();
2391 if (ecs
->ws
.kind
!= TARGET_WAITKIND_IGNORE
)
2393 breakpoint_retire_moribund ();
2395 /* Mark the non-executing threads accordingly. In all-stop, all
2396 threads of all processes are stopped when we get any event
2397 reported. In non-stop mode, only the event thread stops. If
2398 we're handling a process exit in non-stop mode, there's
2399 nothing to do, as threads of the dead process are gone, and
2400 threads of any other process were left running. */
2402 set_executing (minus_one_ptid
, 0);
2403 else if (ecs
->ws
.kind
!= TARGET_WAITKIND_SIGNALLED
2404 && ecs
->ws
.kind
!= TARGET_WAITKIND_EXITED
)
2405 set_executing (inferior_ptid
, 0);
2408 switch (infwait_state
)
2410 case infwait_thread_hop_state
:
2412 fprintf_unfiltered (gdb_stdlog
, "infrun: infwait_thread_hop_state\n");
2413 /* Cancel the waiton_ptid. */
2414 waiton_ptid
= pid_to_ptid (-1);
2417 case infwait_normal_state
:
2419 fprintf_unfiltered (gdb_stdlog
, "infrun: infwait_normal_state\n");
2422 case infwait_step_watch_state
:
2424 fprintf_unfiltered (gdb_stdlog
,
2425 "infrun: infwait_step_watch_state\n");
2427 stepped_after_stopped_by_watchpoint
= 1;
2430 case infwait_nonstep_watch_state
:
2432 fprintf_unfiltered (gdb_stdlog
,
2433 "infrun: infwait_nonstep_watch_state\n");
2434 insert_breakpoints ();
2436 /* FIXME-maybe: is this cleaner than setting a flag? Does it
2437 handle things like signals arriving and other things happening
2438 in combination correctly? */
2439 stepped_after_stopped_by_watchpoint
= 1;
2443 internal_error (__FILE__
, __LINE__
, _("bad switch"));
2445 infwait_state
= infwait_normal_state
;
2447 switch (ecs
->ws
.kind
)
2449 case TARGET_WAITKIND_LOADED
:
2451 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_LOADED\n");
2452 /* Ignore gracefully during startup of the inferior, as it might
2453 be the shell which has just loaded some objects, otherwise
2454 add the symbols for the newly loaded objects. Also ignore at
2455 the beginning of an attach or remote session; we will query
2456 the full list of libraries once the connection is
2458 if (stop_soon
== NO_STOP_QUIETLY
)
2460 /* Check for any newly added shared libraries if we're
2461 supposed to be adding them automatically. Switch
2462 terminal for any messages produced by
2463 breakpoint_re_set. */
2464 target_terminal_ours_for_output ();
2465 /* NOTE: cagney/2003-11-25: Make certain that the target
2466 stack's section table is kept up-to-date. Architectures,
2467 (e.g., PPC64), use the section table to perform
2468 operations such as address => section name and hence
2469 require the table to contain all sections (including
2470 those found in shared libraries). */
2472 SOLIB_ADD (NULL
, 0, ¤t_target
, auto_solib_add
);
2474 solib_add (NULL
, 0, ¤t_target
, auto_solib_add
);
2476 target_terminal_inferior ();
2478 /* If requested, stop when the dynamic linker notifies
2479 gdb of events. This allows the user to get control
2480 and place breakpoints in initializer routines for
2481 dynamically loaded objects (among other things). */
2482 if (stop_on_solib_events
)
2484 stop_stepping (ecs
);
2488 /* NOTE drow/2007-05-11: This might be a good place to check
2489 for "catch load". */
2492 /* If we are skipping through a shell, or through shared library
2493 loading that we aren't interested in, resume the program. If
2494 we're running the program normally, also resume. But stop if
2495 we're attaching or setting up a remote connection. */
2496 if (stop_soon
== STOP_QUIETLY
|| stop_soon
== NO_STOP_QUIETLY
)
2498 /* Loading of shared libraries might have changed breakpoint
2499 addresses. Make sure new breakpoints are inserted. */
2500 if (stop_soon
== NO_STOP_QUIETLY
2501 && !breakpoints_always_inserted_mode ())
2502 insert_breakpoints ();
2503 resume (0, TARGET_SIGNAL_0
);
2504 prepare_to_wait (ecs
);
2510 case TARGET_WAITKIND_SPURIOUS
:
2512 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_SPURIOUS\n");
2513 resume (0, TARGET_SIGNAL_0
);
2514 prepare_to_wait (ecs
);
2517 case TARGET_WAITKIND_EXITED
:
2519 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_EXITED\n");
2520 inferior_ptid
= ecs
->ptid
;
2521 target_terminal_ours (); /* Must do this before mourn anyway */
2522 print_stop_reason (EXITED
, ecs
->ws
.value
.integer
);
2524 /* Record the exit code in the convenience variable $_exitcode, so
2525 that the user can inspect this again later. */
2526 set_internalvar_integer (lookup_internalvar ("_exitcode"),
2527 (LONGEST
) ecs
->ws
.value
.integer
);
2528 gdb_flush (gdb_stdout
);
2529 target_mourn_inferior ();
2530 singlestep_breakpoints_inserted_p
= 0;
2531 stop_print_frame
= 0;
2532 stop_stepping (ecs
);
2535 case TARGET_WAITKIND_SIGNALLED
:
2537 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_SIGNALLED\n");
2538 inferior_ptid
= ecs
->ptid
;
2539 stop_print_frame
= 0;
2540 target_terminal_ours (); /* Must do this before mourn anyway */
2542 /* Note: By definition of TARGET_WAITKIND_SIGNALLED, we shouldn't
2543 reach here unless the inferior is dead. However, for years
2544 target_kill() was called here, which hints that fatal signals aren't
2545 really fatal on some systems. If that's true, then some changes
2547 target_mourn_inferior ();
2549 print_stop_reason (SIGNAL_EXITED
, ecs
->ws
.value
.sig
);
2550 singlestep_breakpoints_inserted_p
= 0;
2551 stop_stepping (ecs
);
2554 /* The following are the only cases in which we keep going;
2555 the above cases end in a continue or goto. */
2556 case TARGET_WAITKIND_FORKED
:
2557 case TARGET_WAITKIND_VFORKED
:
2559 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_FORKED\n");
2561 if (!ptid_equal (ecs
->ptid
, inferior_ptid
))
2563 context_switch (ecs
->ptid
);
2564 reinit_frame_cache ();
2567 /* Immediately detach breakpoints from the child before there's
2568 any chance of letting the user delete breakpoints from the
2569 breakpoint lists. If we don't do this early, it's easy to
2570 leave left over traps in the child, vis: "break foo; catch
2571 fork; c; <fork>; del; c; <child calls foo>". We only follow
2572 the fork on the last `continue', and by that time the
2573 breakpoint at "foo" is long gone from the breakpoint table.
2574 If we vforked, then we don't need to unpatch here, since both
2575 parent and child are sharing the same memory pages; we'll
2576 need to unpatch at follow/detach time instead to be certain
2577 that new breakpoints added between catchpoint hit time and
2578 vfork follow are detached. */
2579 if (ecs
->ws
.kind
!= TARGET_WAITKIND_VFORKED
)
2581 int child_pid
= ptid_get_pid (ecs
->ws
.value
.related_pid
);
2583 /* This won't actually modify the breakpoint list, but will
2584 physically remove the breakpoints from the child. */
2585 detach_breakpoints (child_pid
);
2588 /* In case the event is caught by a catchpoint, remember that
2589 the event is to be followed at the next resume of the thread,
2590 and not immediately. */
2591 ecs
->event_thread
->pending_follow
= ecs
->ws
;
2593 stop_pc
= regcache_read_pc (get_thread_regcache (ecs
->ptid
));
2595 ecs
->event_thread
->stop_bpstat
= bpstat_stop_status (stop_pc
, ecs
->ptid
);
2597 ecs
->random_signal
= !bpstat_explains_signal (ecs
->event_thread
->stop_bpstat
);
2599 /* If no catchpoint triggered for this, then keep going. */
2600 if (ecs
->random_signal
)
2604 ecs
->event_thread
->stop_signal
= TARGET_SIGNAL_0
;
2606 should_resume
= follow_fork ();
2608 ecs
->event_thread
= inferior_thread ();
2609 ecs
->ptid
= inferior_ptid
;
2614 stop_stepping (ecs
);
2617 ecs
->event_thread
->stop_signal
= TARGET_SIGNAL_TRAP
;
2618 goto process_event_stop_test
;
2620 case TARGET_WAITKIND_EXECD
:
2622 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_EXECD\n");
2624 if (!ptid_equal (ecs
->ptid
, inferior_ptid
))
2626 context_switch (ecs
->ptid
);
2627 reinit_frame_cache ();
2630 stop_pc
= regcache_read_pc (get_thread_regcache (ecs
->ptid
));
2632 /* This causes the eventpoints and symbol table to be reset.
2633 Must do this now, before trying to determine whether to
2635 follow_exec (inferior_ptid
, ecs
->ws
.value
.execd_pathname
);
2637 ecs
->event_thread
->stop_bpstat
= bpstat_stop_status (stop_pc
, ecs
->ptid
);
2638 ecs
->random_signal
= !bpstat_explains_signal (ecs
->event_thread
->stop_bpstat
);
2640 /* Note that this may be referenced from inside
2641 bpstat_stop_status above, through inferior_has_execd. */
2642 xfree (ecs
->ws
.value
.execd_pathname
);
2643 ecs
->ws
.value
.execd_pathname
= NULL
;
2645 /* If no catchpoint triggered for this, then keep going. */
2646 if (ecs
->random_signal
)
2648 ecs
->event_thread
->stop_signal
= TARGET_SIGNAL_0
;
2652 ecs
->event_thread
->stop_signal
= TARGET_SIGNAL_TRAP
;
2653 goto process_event_stop_test
;
2655 /* Be careful not to try to gather much state about a thread
2656 that's in a syscall. It's frequently a losing proposition. */
2657 case TARGET_WAITKIND_SYSCALL_ENTRY
:
2659 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_SYSCALL_ENTRY\n");
2660 resume (0, TARGET_SIGNAL_0
);
2661 prepare_to_wait (ecs
);
2664 /* Before examining the threads further, step this thread to
2665 get it entirely out of the syscall. (We get notice of the
2666 event when the thread is just on the verge of exiting a
2667 syscall. Stepping one instruction seems to get it back
2669 case TARGET_WAITKIND_SYSCALL_RETURN
:
2671 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_SYSCALL_RETURN\n");
2672 target_resume (ecs
->ptid
, 1, TARGET_SIGNAL_0
);
2673 prepare_to_wait (ecs
);
2676 case TARGET_WAITKIND_STOPPED
:
2678 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_STOPPED\n");
2679 ecs
->event_thread
->stop_signal
= ecs
->ws
.value
.sig
;
2682 case TARGET_WAITKIND_NO_HISTORY
:
2683 /* Reverse execution: target ran out of history info. */
2684 stop_pc
= regcache_read_pc (get_thread_regcache (ecs
->ptid
));
2685 print_stop_reason (NO_HISTORY
, 0);
2686 stop_stepping (ecs
);
2689 /* We had an event in the inferior, but we are not interested
2690 in handling it at this level. The lower layers have already
2691 done what needs to be done, if anything.
2693 One of the possible circumstances for this is when the
2694 inferior produces output for the console. The inferior has
2695 not stopped, and we are ignoring the event. Another possible
2696 circumstance is any event which the lower level knows will be
2697 reported multiple times without an intervening resume. */
2698 case TARGET_WAITKIND_IGNORE
:
2700 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_IGNORE\n");
2701 prepare_to_wait (ecs
);
2705 if (ecs
->new_thread_event
)
2708 /* Non-stop assumes that the target handles adding new threads
2709 to the thread list. */
2710 internal_error (__FILE__
, __LINE__
, "\
2711 targets should add new threads to the thread list themselves in non-stop mode.");
2713 /* We may want to consider not doing a resume here in order to
2714 give the user a chance to play with the new thread. It might
2715 be good to make that a user-settable option. */
2717 /* At this point, all threads are stopped (happens automatically
2718 in either the OS or the native code). Therefore we need to
2719 continue all threads in order to make progress. */
2721 target_resume (RESUME_ALL
, 0, TARGET_SIGNAL_0
);
2722 prepare_to_wait (ecs
);
2726 if (ecs
->ws
.kind
== TARGET_WAITKIND_STOPPED
)
2728 /* Do we need to clean up the state of a thread that has
2729 completed a displaced single-step? (Doing so usually affects
2730 the PC, so do it here, before we set stop_pc.) */
2731 displaced_step_fixup (ecs
->ptid
, ecs
->event_thread
->stop_signal
);
2733 /* If we either finished a single-step or hit a breakpoint, but
2734 the user wanted this thread to be stopped, pretend we got a
2735 SIG0 (generic unsignaled stop). */
2737 if (ecs
->event_thread
->stop_requested
2738 && ecs
->event_thread
->stop_signal
== TARGET_SIGNAL_TRAP
)
2739 ecs
->event_thread
->stop_signal
= TARGET_SIGNAL_0
;
2742 stop_pc
= regcache_read_pc (get_thread_regcache (ecs
->ptid
));
2746 fprintf_unfiltered (gdb_stdlog
, "infrun: stop_pc = 0x%s\n",
2747 paddr_nz (stop_pc
));
2748 if (target_stopped_by_watchpoint ())
2751 fprintf_unfiltered (gdb_stdlog
, "infrun: stopped by watchpoint\n");
2753 if (target_stopped_data_address (¤t_target
, &addr
))
2754 fprintf_unfiltered (gdb_stdlog
,
2755 "infrun: stopped data address = 0x%s\n",
2758 fprintf_unfiltered (gdb_stdlog
,
2759 "infrun: (no data address available)\n");
2763 if (stepping_past_singlestep_breakpoint
)
2765 gdb_assert (singlestep_breakpoints_inserted_p
);
2766 gdb_assert (ptid_equal (singlestep_ptid
, ecs
->ptid
));
2767 gdb_assert (!ptid_equal (singlestep_ptid
, saved_singlestep_ptid
));
2769 stepping_past_singlestep_breakpoint
= 0;
2771 /* We've either finished single-stepping past the single-step
2772 breakpoint, or stopped for some other reason. It would be nice if
2773 we could tell, but we can't reliably. */
2774 if (ecs
->event_thread
->stop_signal
== TARGET_SIGNAL_TRAP
)
2777 fprintf_unfiltered (gdb_stdlog
, "infrun: stepping_past_singlestep_breakpoint\n");
2778 /* Pull the single step breakpoints out of the target. */
2779 remove_single_step_breakpoints ();
2780 singlestep_breakpoints_inserted_p
= 0;
2782 ecs
->random_signal
= 0;
2784 context_switch (saved_singlestep_ptid
);
2785 if (deprecated_context_hook
)
2786 deprecated_context_hook (pid_to_thread_id (ecs
->ptid
));
2788 resume (1, TARGET_SIGNAL_0
);
2789 prepare_to_wait (ecs
);
2794 if (!ptid_equal (deferred_step_ptid
, null_ptid
))
2796 /* In non-stop mode, there's never a deferred_step_ptid set. */
2797 gdb_assert (!non_stop
);
2799 /* If we stopped for some other reason than single-stepping, ignore
2800 the fact that we were supposed to switch back. */
2801 if (ecs
->event_thread
->stop_signal
== TARGET_SIGNAL_TRAP
)
2804 fprintf_unfiltered (gdb_stdlog
,
2805 "infrun: handling deferred step\n");
2807 /* Pull the single step breakpoints out of the target. */
2808 if (singlestep_breakpoints_inserted_p
)
2810 remove_single_step_breakpoints ();
2811 singlestep_breakpoints_inserted_p
= 0;
2814 /* Note: We do not call context_switch at this point, as the
2815 context is already set up for stepping the original thread. */
2816 switch_to_thread (deferred_step_ptid
);
2817 deferred_step_ptid
= null_ptid
;
2818 /* Suppress spurious "Switching to ..." message. */
2819 previous_inferior_ptid
= inferior_ptid
;
2821 resume (1, TARGET_SIGNAL_0
);
2822 prepare_to_wait (ecs
);
2826 deferred_step_ptid
= null_ptid
;
2829 /* See if a thread hit a thread-specific breakpoint that was meant for
2830 another thread. If so, then step that thread past the breakpoint,
2833 if (ecs
->event_thread
->stop_signal
== TARGET_SIGNAL_TRAP
)
2835 int thread_hop_needed
= 0;
2837 /* Check if a regular breakpoint has been hit before checking
2838 for a potential single step breakpoint. Otherwise, GDB will
2839 not see this breakpoint hit when stepping onto breakpoints. */
2840 if (regular_breakpoint_inserted_here_p (stop_pc
))
2842 ecs
->random_signal
= 0;
2843 if (!breakpoint_thread_match (stop_pc
, ecs
->ptid
))
2844 thread_hop_needed
= 1;
2846 else if (singlestep_breakpoints_inserted_p
)
2848 /* We have not context switched yet, so this should be true
2849 no matter which thread hit the singlestep breakpoint. */
2850 gdb_assert (ptid_equal (inferior_ptid
, singlestep_ptid
));
2852 fprintf_unfiltered (gdb_stdlog
, "infrun: software single step "
2854 target_pid_to_str (ecs
->ptid
));
2856 ecs
->random_signal
= 0;
2857 /* The call to in_thread_list is necessary because PTIDs sometimes
2858 change when we go from single-threaded to multi-threaded. If
2859 the singlestep_ptid is still in the list, assume that it is
2860 really different from ecs->ptid. */
2861 if (!ptid_equal (singlestep_ptid
, ecs
->ptid
)
2862 && in_thread_list (singlestep_ptid
))
2864 /* If the PC of the thread we were trying to single-step
2865 has changed, discard this event (which we were going
2866 to ignore anyway), and pretend we saw that thread
2867 trap. This prevents us continuously moving the
2868 single-step breakpoint forward, one instruction at a
2869 time. If the PC has changed, then the thread we were
2870 trying to single-step has trapped or been signalled,
2871 but the event has not been reported to GDB yet.
2873 There might be some cases where this loses signal
2874 information, if a signal has arrived at exactly the
2875 same time that the PC changed, but this is the best
2876 we can do with the information available. Perhaps we
2877 should arrange to report all events for all threads
2878 when they stop, or to re-poll the remote looking for
2879 this particular thread (i.e. temporarily enable
2882 CORE_ADDR new_singlestep_pc
2883 = regcache_read_pc (get_thread_regcache (singlestep_ptid
));
2885 if (new_singlestep_pc
!= singlestep_pc
)
2887 enum target_signal stop_signal
;
2890 fprintf_unfiltered (gdb_stdlog
, "infrun: unexpected thread,"
2891 " but expected thread advanced also\n");
2893 /* The current context still belongs to
2894 singlestep_ptid. Don't swap here, since that's
2895 the context we want to use. Just fudge our
2896 state and continue. */
2897 stop_signal
= ecs
->event_thread
->stop_signal
;
2898 ecs
->event_thread
->stop_signal
= TARGET_SIGNAL_0
;
2899 ecs
->ptid
= singlestep_ptid
;
2900 ecs
->event_thread
= find_thread_ptid (ecs
->ptid
);
2901 ecs
->event_thread
->stop_signal
= stop_signal
;
2902 stop_pc
= new_singlestep_pc
;
2907 fprintf_unfiltered (gdb_stdlog
,
2908 "infrun: unexpected thread\n");
2910 thread_hop_needed
= 1;
2911 stepping_past_singlestep_breakpoint
= 1;
2912 saved_singlestep_ptid
= singlestep_ptid
;
2917 if (thread_hop_needed
)
2919 struct regcache
*thread_regcache
;
2920 int remove_status
= 0;
2923 fprintf_unfiltered (gdb_stdlog
, "infrun: thread_hop_needed\n");
2925 /* Switch context before touching inferior memory, the
2926 previous thread may have exited. */
2927 if (!ptid_equal (inferior_ptid
, ecs
->ptid
))
2928 context_switch (ecs
->ptid
);
2930 /* Saw a breakpoint, but it was hit by the wrong thread.
2933 if (singlestep_breakpoints_inserted_p
)
2935 /* Pull the single step breakpoints out of the target. */
2936 remove_single_step_breakpoints ();
2937 singlestep_breakpoints_inserted_p
= 0;
2940 /* If the arch can displace step, don't remove the
2942 thread_regcache
= get_thread_regcache (ecs
->ptid
);
2943 if (!use_displaced_stepping (get_regcache_arch (thread_regcache
)))
2944 remove_status
= remove_breakpoints ();
2946 /* Did we fail to remove breakpoints? If so, try
2947 to set the PC past the bp. (There's at least
2948 one situation in which we can fail to remove
2949 the bp's: On HP-UX's that use ttrace, we can't
2950 change the address space of a vforking child
2951 process until the child exits (well, okay, not
2952 then either :-) or execs. */
2953 if (remove_status
!= 0)
2954 error (_("Cannot step over breakpoint hit in wrong thread"));
2959 /* Only need to require the next event from this
2960 thread in all-stop mode. */
2961 waiton_ptid
= ecs
->ptid
;
2962 infwait_state
= infwait_thread_hop_state
;
2965 ecs
->event_thread
->stepping_over_breakpoint
= 1;
2967 registers_changed ();
2971 else if (singlestep_breakpoints_inserted_p
)
2973 sw_single_step_trap_p
= 1;
2974 ecs
->random_signal
= 0;
2978 ecs
->random_signal
= 1;
2980 /* See if something interesting happened to the non-current thread. If
2981 so, then switch to that thread. */
2982 if (!ptid_equal (ecs
->ptid
, inferior_ptid
))
2985 fprintf_unfiltered (gdb_stdlog
, "infrun: context switch\n");
2987 context_switch (ecs
->ptid
);
2989 if (deprecated_context_hook
)
2990 deprecated_context_hook (pid_to_thread_id (ecs
->ptid
));
2993 /* At this point, get hold of the now-current thread's frame. */
2994 frame
= get_current_frame ();
2995 gdbarch
= get_frame_arch (frame
);
2997 if (singlestep_breakpoints_inserted_p
)
2999 /* Pull the single step breakpoints out of the target. */
3000 remove_single_step_breakpoints ();
3001 singlestep_breakpoints_inserted_p
= 0;
3004 if (stepped_after_stopped_by_watchpoint
)
3005 stopped_by_watchpoint
= 0;
3007 stopped_by_watchpoint
= watchpoints_triggered (&ecs
->ws
);
3009 /* If necessary, step over this watchpoint. We'll be back to display
3011 if (stopped_by_watchpoint
3012 && (target_have_steppable_watchpoint
3013 || gdbarch_have_nonsteppable_watchpoint (gdbarch
)))
3015 /* At this point, we are stopped at an instruction which has
3016 attempted to write to a piece of memory under control of
3017 a watchpoint. The instruction hasn't actually executed
3018 yet. If we were to evaluate the watchpoint expression
3019 now, we would get the old value, and therefore no change
3020 would seem to have occurred.
3022 In order to make watchpoints work `right', we really need
3023 to complete the memory write, and then evaluate the
3024 watchpoint expression. We do this by single-stepping the
3027 It may not be necessary to disable the watchpoint to stop over
3028 it. For example, the PA can (with some kernel cooperation)
3029 single step over a watchpoint without disabling the watchpoint.
3031 It is far more common to need to disable a watchpoint to step
3032 the inferior over it. If we have non-steppable watchpoints,
3033 we must disable the current watchpoint; it's simplest to
3034 disable all watchpoints and breakpoints. */
3037 if (!target_have_steppable_watchpoint
)
3038 remove_breakpoints ();
3040 hw_step
= maybe_software_singlestep (gdbarch
, stop_pc
);
3041 target_resume (ecs
->ptid
, hw_step
, TARGET_SIGNAL_0
);
3042 registers_changed ();
3043 waiton_ptid
= ecs
->ptid
;
3044 if (target_have_steppable_watchpoint
)
3045 infwait_state
= infwait_step_watch_state
;
3047 infwait_state
= infwait_nonstep_watch_state
;
3048 prepare_to_wait (ecs
);
3052 ecs
->stop_func_start
= 0;
3053 ecs
->stop_func_end
= 0;
3054 ecs
->stop_func_name
= 0;
3055 /* Don't care about return value; stop_func_start and stop_func_name
3056 will both be 0 if it doesn't work. */
3057 find_pc_partial_function (stop_pc
, &ecs
->stop_func_name
,
3058 &ecs
->stop_func_start
, &ecs
->stop_func_end
);
3059 ecs
->stop_func_start
3060 += gdbarch_deprecated_function_start_offset (gdbarch
);
3061 ecs
->event_thread
->stepping_over_breakpoint
= 0;
3062 bpstat_clear (&ecs
->event_thread
->stop_bpstat
);
3063 ecs
->event_thread
->stop_step
= 0;
3064 stop_print_frame
= 1;
3065 ecs
->random_signal
= 0;
3066 stopped_by_random_signal
= 0;
3068 if (ecs
->event_thread
->stop_signal
== TARGET_SIGNAL_TRAP
3069 && ecs
->event_thread
->trap_expected
3070 && gdbarch_single_step_through_delay_p (gdbarch
)
3071 && currently_stepping (ecs
->event_thread
))
3073 /* We're trying to step off a breakpoint. Turns out that we're
3074 also on an instruction that needs to be stepped multiple
3075 times before it's been fully executing. E.g., architectures
3076 with a delay slot. It needs to be stepped twice, once for
3077 the instruction and once for the delay slot. */
3078 int step_through_delay
3079 = gdbarch_single_step_through_delay (gdbarch
, frame
);
3080 if (debug_infrun
&& step_through_delay
)
3081 fprintf_unfiltered (gdb_stdlog
, "infrun: step through delay\n");
3082 if (ecs
->event_thread
->step_range_end
== 0 && step_through_delay
)
3084 /* The user issued a continue when stopped at a breakpoint.
3085 Set up for another trap and get out of here. */
3086 ecs
->event_thread
->stepping_over_breakpoint
= 1;
3090 else if (step_through_delay
)
3092 /* The user issued a step when stopped at a breakpoint.
3093 Maybe we should stop, maybe we should not - the delay
3094 slot *might* correspond to a line of source. In any
3095 case, don't decide that here, just set
3096 ecs->stepping_over_breakpoint, making sure we
3097 single-step again before breakpoints are re-inserted. */
3098 ecs
->event_thread
->stepping_over_breakpoint
= 1;
3102 /* Look at the cause of the stop, and decide what to do.
3103 The alternatives are:
3104 1) stop_stepping and return; to really stop and return to the debugger,
3105 2) keep_going and return to start up again
3106 (set ecs->event_thread->stepping_over_breakpoint to 1 to single step once)
3107 3) set ecs->random_signal to 1, and the decision between 1 and 2
3108 will be made according to the signal handling tables. */
3110 /* First, distinguish signals caused by the debugger from signals
3111 that have to do with the program's own actions. Note that
3112 breakpoint insns may cause SIGTRAP or SIGILL or SIGEMT, depending
3113 on the operating system version. Here we detect when a SIGILL or
3114 SIGEMT is really a breakpoint and change it to SIGTRAP. We do
3115 something similar for SIGSEGV, since a SIGSEGV will be generated
3116 when we're trying to execute a breakpoint instruction on a
3117 non-executable stack. This happens for call dummy breakpoints
3118 for architectures like SPARC that place call dummies on the
3121 If we're doing a displaced step past a breakpoint, then the
3122 breakpoint is always inserted at the original instruction;
3123 non-standard signals can't be explained by the breakpoint. */
3124 if (ecs
->event_thread
->stop_signal
== TARGET_SIGNAL_TRAP
3125 || (! ecs
->event_thread
->trap_expected
3126 && breakpoint_inserted_here_p (stop_pc
)
3127 && (ecs
->event_thread
->stop_signal
== TARGET_SIGNAL_ILL
3128 || ecs
->event_thread
->stop_signal
== TARGET_SIGNAL_SEGV
3129 || ecs
->event_thread
->stop_signal
== TARGET_SIGNAL_EMT
))
3130 || stop_soon
== STOP_QUIETLY
|| stop_soon
== STOP_QUIETLY_NO_SIGSTOP
3131 || stop_soon
== STOP_QUIETLY_REMOTE
)
3133 if (ecs
->event_thread
->stop_signal
== TARGET_SIGNAL_TRAP
&& stop_after_trap
)
3136 fprintf_unfiltered (gdb_stdlog
, "infrun: stopped\n");
3137 stop_print_frame
= 0;
3138 stop_stepping (ecs
);
3142 /* This is originated from start_remote(), start_inferior() and
3143 shared libraries hook functions. */
3144 if (stop_soon
== STOP_QUIETLY
|| stop_soon
== STOP_QUIETLY_REMOTE
)
3147 fprintf_unfiltered (gdb_stdlog
, "infrun: quietly stopped\n");
3148 stop_stepping (ecs
);
3152 /* This originates from attach_command(). We need to overwrite
3153 the stop_signal here, because some kernels don't ignore a
3154 SIGSTOP in a subsequent ptrace(PTRACE_CONT,SIGSTOP) call.
3155 See more comments in inferior.h. On the other hand, if we
3156 get a non-SIGSTOP, report it to the user - assume the backend
3157 will handle the SIGSTOP if it should show up later.
3159 Also consider that the attach is complete when we see a
3160 SIGTRAP. Some systems (e.g. Windows), and stubs supporting
3161 target extended-remote report it instead of a SIGSTOP
3162 (e.g. gdbserver). We already rely on SIGTRAP being our
3163 signal, so this is no exception.
3165 Also consider that the attach is complete when we see a
3166 TARGET_SIGNAL_0. In non-stop mode, GDB will explicitly tell
3167 the target to stop all threads of the inferior, in case the
3168 low level attach operation doesn't stop them implicitly. If
3169 they weren't stopped implicitly, then the stub will report a
3170 TARGET_SIGNAL_0, meaning: stopped for no particular reason
3171 other than GDB's request. */
3172 if (stop_soon
== STOP_QUIETLY_NO_SIGSTOP
3173 && (ecs
->event_thread
->stop_signal
== TARGET_SIGNAL_STOP
3174 || ecs
->event_thread
->stop_signal
== TARGET_SIGNAL_TRAP
3175 || ecs
->event_thread
->stop_signal
== TARGET_SIGNAL_0
))
3177 stop_stepping (ecs
);
3178 ecs
->event_thread
->stop_signal
= TARGET_SIGNAL_0
;
3182 /* See if there is a breakpoint at the current PC. */
3183 ecs
->event_thread
->stop_bpstat
= bpstat_stop_status (stop_pc
, ecs
->ptid
);
3185 /* Following in case break condition called a
3187 stop_print_frame
= 1;
3189 /* NOTE: cagney/2003-03-29: These two checks for a random signal
3190 at one stage in the past included checks for an inferior
3191 function call's call dummy's return breakpoint. The original
3192 comment, that went with the test, read:
3194 ``End of a stack dummy. Some systems (e.g. Sony news) give
3195 another signal besides SIGTRAP, so check here as well as
3198 If someone ever tries to get call dummys on a
3199 non-executable stack to work (where the target would stop
3200 with something like a SIGSEGV), then those tests might need
3201 to be re-instated. Given, however, that the tests were only
3202 enabled when momentary breakpoints were not being used, I
3203 suspect that it won't be the case.
3205 NOTE: kettenis/2004-02-05: Indeed such checks don't seem to
3206 be necessary for call dummies on a non-executable stack on
3209 if (ecs
->event_thread
->stop_signal
== TARGET_SIGNAL_TRAP
)
3211 = !(bpstat_explains_signal (ecs
->event_thread
->stop_bpstat
)
3212 || ecs
->event_thread
->trap_expected
3213 || (ecs
->event_thread
->step_range_end
3214 && ecs
->event_thread
->step_resume_breakpoint
== NULL
));
3217 ecs
->random_signal
= !bpstat_explains_signal (ecs
->event_thread
->stop_bpstat
);
3218 if (!ecs
->random_signal
)
3219 ecs
->event_thread
->stop_signal
= TARGET_SIGNAL_TRAP
;
3223 /* When we reach this point, we've pretty much decided
3224 that the reason for stopping must've been a random
3225 (unexpected) signal. */
3228 ecs
->random_signal
= 1;
3230 process_event_stop_test
:
3232 /* Re-fetch current thread's frame in case we did a
3233 "goto process_event_stop_test" above. */
3234 frame
= get_current_frame ();
3235 gdbarch
= get_frame_arch (frame
);
3237 /* For the program's own signals, act according to
3238 the signal handling tables. */
3240 if (ecs
->random_signal
)
3242 /* Signal not for debugging purposes. */
3246 fprintf_unfiltered (gdb_stdlog
, "infrun: random signal %d\n",
3247 ecs
->event_thread
->stop_signal
);
3249 stopped_by_random_signal
= 1;
3251 if (signal_print
[ecs
->event_thread
->stop_signal
])
3254 target_terminal_ours_for_output ();
3255 print_stop_reason (SIGNAL_RECEIVED
, ecs
->event_thread
->stop_signal
);
3257 /* Always stop on signals if we're either just gaining control
3258 of the program, or the user explicitly requested this thread
3259 to remain stopped. */
3260 if (stop_soon
!= NO_STOP_QUIETLY
3261 || ecs
->event_thread
->stop_requested
3262 || signal_stop_state (ecs
->event_thread
->stop_signal
))
3264 stop_stepping (ecs
);
3267 /* If not going to stop, give terminal back
3268 if we took it away. */
3270 target_terminal_inferior ();
3272 /* Clear the signal if it should not be passed. */
3273 if (signal_program
[ecs
->event_thread
->stop_signal
] == 0)
3274 ecs
->event_thread
->stop_signal
= TARGET_SIGNAL_0
;
3276 if (ecs
->event_thread
->prev_pc
== stop_pc
3277 && ecs
->event_thread
->trap_expected
3278 && ecs
->event_thread
->step_resume_breakpoint
== NULL
)
3280 /* We were just starting a new sequence, attempting to
3281 single-step off of a breakpoint and expecting a SIGTRAP.
3282 Instead this signal arrives. This signal will take us out
3283 of the stepping range so GDB needs to remember to, when
3284 the signal handler returns, resume stepping off that
3286 /* To simplify things, "continue" is forced to use the same
3287 code paths as single-step - set a breakpoint at the
3288 signal return address and then, once hit, step off that
3291 fprintf_unfiltered (gdb_stdlog
,
3292 "infrun: signal arrived while stepping over "
3295 insert_step_resume_breakpoint_at_frame (frame
);
3296 ecs
->event_thread
->step_after_step_resume_breakpoint
= 1;
3301 if (ecs
->event_thread
->step_range_end
!= 0
3302 && ecs
->event_thread
->stop_signal
!= TARGET_SIGNAL_0
3303 && (ecs
->event_thread
->step_range_start
<= stop_pc
3304 && stop_pc
< ecs
->event_thread
->step_range_end
)
3305 && frame_id_eq (get_frame_id (frame
),
3306 ecs
->event_thread
->step_frame_id
)
3307 && ecs
->event_thread
->step_resume_breakpoint
== NULL
)
3309 /* The inferior is about to take a signal that will take it
3310 out of the single step range. Set a breakpoint at the
3311 current PC (which is presumably where the signal handler
3312 will eventually return) and then allow the inferior to
3315 Note that this is only needed for a signal delivered
3316 while in the single-step range. Nested signals aren't a
3317 problem as they eventually all return. */
3319 fprintf_unfiltered (gdb_stdlog
,
3320 "infrun: signal may take us out of "
3321 "single-step range\n");
3323 insert_step_resume_breakpoint_at_frame (frame
);
3328 /* Note: step_resume_breakpoint may be non-NULL. This occures
3329 when either there's a nested signal, or when there's a
3330 pending signal enabled just as the signal handler returns
3331 (leaving the inferior at the step-resume-breakpoint without
3332 actually executing it). Either way continue until the
3333 breakpoint is really hit. */
3338 /* Handle cases caused by hitting a breakpoint. */
3340 CORE_ADDR jmp_buf_pc
;
3341 struct bpstat_what what
;
3343 what
= bpstat_what (ecs
->event_thread
->stop_bpstat
);
3345 if (what
.call_dummy
)
3347 stop_stack_dummy
= 1;
3350 switch (what
.main_action
)
3352 case BPSTAT_WHAT_SET_LONGJMP_RESUME
:
3353 /* If we hit the breakpoint at longjmp while stepping, we
3354 install a momentary breakpoint at the target of the
3358 fprintf_unfiltered (gdb_stdlog
,
3359 "infrun: BPSTAT_WHAT_SET_LONGJMP_RESUME\n");
3361 ecs
->event_thread
->stepping_over_breakpoint
= 1;
3363 if (!gdbarch_get_longjmp_target_p (gdbarch
)
3364 || !gdbarch_get_longjmp_target (gdbarch
, frame
, &jmp_buf_pc
))
3367 fprintf_unfiltered (gdb_stdlog
, "\
3368 infrun: BPSTAT_WHAT_SET_LONGJMP_RESUME (!gdbarch_get_longjmp_target)\n");
3373 /* We're going to replace the current step-resume breakpoint
3374 with a longjmp-resume breakpoint. */
3375 delete_step_resume_breakpoint (ecs
->event_thread
);
3377 /* Insert a breakpoint at resume address. */
3378 insert_longjmp_resume_breakpoint (jmp_buf_pc
);
3383 case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME
:
3385 fprintf_unfiltered (gdb_stdlog
,
3386 "infrun: BPSTAT_WHAT_CLEAR_LONGJMP_RESUME\n");
3388 gdb_assert (ecs
->event_thread
->step_resume_breakpoint
!= NULL
);
3389 delete_step_resume_breakpoint (ecs
->event_thread
);
3391 ecs
->event_thread
->stop_step
= 1;
3392 print_stop_reason (END_STEPPING_RANGE
, 0);
3393 stop_stepping (ecs
);
3396 case BPSTAT_WHAT_SINGLE
:
3398 fprintf_unfiltered (gdb_stdlog
, "infrun: BPSTAT_WHAT_SINGLE\n");
3399 ecs
->event_thread
->stepping_over_breakpoint
= 1;
3400 /* Still need to check other stuff, at least the case
3401 where we are stepping and step out of the right range. */
3404 case BPSTAT_WHAT_STOP_NOISY
:
3406 fprintf_unfiltered (gdb_stdlog
, "infrun: BPSTAT_WHAT_STOP_NOISY\n");
3407 stop_print_frame
= 1;
3409 /* We are about to nuke the step_resume_breakpointt via the
3410 cleanup chain, so no need to worry about it here. */
3412 stop_stepping (ecs
);
3415 case BPSTAT_WHAT_STOP_SILENT
:
3417 fprintf_unfiltered (gdb_stdlog
, "infrun: BPSTAT_WHAT_STOP_SILENT\n");
3418 stop_print_frame
= 0;
3420 /* We are about to nuke the step_resume_breakpoin via the
3421 cleanup chain, so no need to worry about it here. */
3423 stop_stepping (ecs
);
3426 case BPSTAT_WHAT_STEP_RESUME
:
3428 fprintf_unfiltered (gdb_stdlog
, "infrun: BPSTAT_WHAT_STEP_RESUME\n");
3430 delete_step_resume_breakpoint (ecs
->event_thread
);
3431 if (ecs
->event_thread
->step_after_step_resume_breakpoint
)
3433 /* Back when the step-resume breakpoint was inserted, we
3434 were trying to single-step off a breakpoint. Go back
3436 ecs
->event_thread
->step_after_step_resume_breakpoint
= 0;
3437 ecs
->event_thread
->stepping_over_breakpoint
= 1;
3441 if (stop_pc
== ecs
->stop_func_start
3442 && execution_direction
== EXEC_REVERSE
)
3444 /* We are stepping over a function call in reverse, and
3445 just hit the step-resume breakpoint at the start
3446 address of the function. Go back to single-stepping,
3447 which should take us back to the function call. */
3448 ecs
->event_thread
->stepping_over_breakpoint
= 1;
3454 case BPSTAT_WHAT_CHECK_SHLIBS
:
3457 fprintf_unfiltered (gdb_stdlog
, "infrun: BPSTAT_WHAT_CHECK_SHLIBS\n");
3459 /* Check for any newly added shared libraries if we're
3460 supposed to be adding them automatically. Switch
3461 terminal for any messages produced by
3462 breakpoint_re_set. */
3463 target_terminal_ours_for_output ();
3464 /* NOTE: cagney/2003-11-25: Make certain that the target
3465 stack's section table is kept up-to-date. Architectures,
3466 (e.g., PPC64), use the section table to perform
3467 operations such as address => section name and hence
3468 require the table to contain all sections (including
3469 those found in shared libraries). */
3471 SOLIB_ADD (NULL
, 0, ¤t_target
, auto_solib_add
);
3473 solib_add (NULL
, 0, ¤t_target
, auto_solib_add
);
3475 target_terminal_inferior ();
3477 /* If requested, stop when the dynamic linker notifies
3478 gdb of events. This allows the user to get control
3479 and place breakpoints in initializer routines for
3480 dynamically loaded objects (among other things). */
3481 if (stop_on_solib_events
|| stop_stack_dummy
)
3483 stop_stepping (ecs
);
3488 /* We want to step over this breakpoint, then keep going. */
3489 ecs
->event_thread
->stepping_over_breakpoint
= 1;
3495 case BPSTAT_WHAT_LAST
:
3496 /* Not a real code, but listed here to shut up gcc -Wall. */
3498 case BPSTAT_WHAT_KEEP_CHECKING
:
3503 /* We come here if we hit a breakpoint but should not
3504 stop for it. Possibly we also were stepping
3505 and should stop for that. So fall through and
3506 test for stepping. But, if not stepping,
3509 /* In all-stop mode, if we're currently stepping but have stopped in
3510 some other thread, we need to switch back to the stepped thread. */
3513 struct thread_info
*tp
;
3514 tp
= iterate_over_threads (currently_stepping_or_nexting_callback
,
3518 /* However, if the current thread is blocked on some internal
3519 breakpoint, and we simply need to step over that breakpoint
3520 to get it going again, do that first. */
3521 if ((ecs
->event_thread
->trap_expected
3522 && ecs
->event_thread
->stop_signal
!= TARGET_SIGNAL_TRAP
)
3523 || ecs
->event_thread
->stepping_over_breakpoint
)
3529 /* If the stepping thread exited, then don't try to switch
3530 back and resume it, which could fail in several different
3531 ways depending on the target. Instead, just keep going.
3533 We can find a stepping dead thread in the thread list in
3536 - The target supports thread exit events, and when the
3537 target tries to delete the thread from the thread list,
3538 inferior_ptid pointed at the exiting thread. In such
3539 case, calling delete_thread does not really remove the
3540 thread from the list; instead, the thread is left listed,
3541 with 'exited' state.
3543 - The target's debug interface does not support thread
3544 exit events, and so we have no idea whatsoever if the
3545 previously stepping thread is still alive. For that
3546 reason, we need to synchronously query the target
3548 if (is_exited (tp
->ptid
)
3549 || !target_thread_alive (tp
->ptid
))
3552 fprintf_unfiltered (gdb_stdlog
, "\
3553 infrun: not switching back to stepped thread, it has vanished\n");
3555 delete_thread (tp
->ptid
);
3560 /* Otherwise, we no longer expect a trap in the current thread.
3561 Clear the trap_expected flag before switching back -- this is
3562 what keep_going would do as well, if we called it. */
3563 ecs
->event_thread
->trap_expected
= 0;
3566 fprintf_unfiltered (gdb_stdlog
,
3567 "infrun: switching back to stepped thread\n");
3569 ecs
->event_thread
= tp
;
3570 ecs
->ptid
= tp
->ptid
;
3571 context_switch (ecs
->ptid
);
3577 /* Are we stepping to get the inferior out of the dynamic linker's
3578 hook (and possibly the dld itself) after catching a shlib
3580 if (ecs
->event_thread
->stepping_through_solib_after_catch
)
3582 #if defined(SOLIB_ADD)
3583 /* Have we reached our destination? If not, keep going. */
3584 if (SOLIB_IN_DYNAMIC_LINKER (PIDGET (ecs
->ptid
), stop_pc
))
3587 fprintf_unfiltered (gdb_stdlog
, "infrun: stepping in dynamic linker\n");
3588 ecs
->event_thread
->stepping_over_breakpoint
= 1;
3594 fprintf_unfiltered (gdb_stdlog
, "infrun: step past dynamic linker\n");
3595 /* Else, stop and report the catchpoint(s) whose triggering
3596 caused us to begin stepping. */
3597 ecs
->event_thread
->stepping_through_solib_after_catch
= 0;
3598 bpstat_clear (&ecs
->event_thread
->stop_bpstat
);
3599 ecs
->event_thread
->stop_bpstat
3600 = bpstat_copy (ecs
->event_thread
->stepping_through_solib_catchpoints
);
3601 bpstat_clear (&ecs
->event_thread
->stepping_through_solib_catchpoints
);
3602 stop_print_frame
= 1;
3603 stop_stepping (ecs
);
3607 if (ecs
->event_thread
->step_resume_breakpoint
)
3610 fprintf_unfiltered (gdb_stdlog
,
3611 "infrun: step-resume breakpoint is inserted\n");
3613 /* Having a step-resume breakpoint overrides anything
3614 else having to do with stepping commands until
3615 that breakpoint is reached. */
3620 if (ecs
->event_thread
->step_range_end
== 0)
3623 fprintf_unfiltered (gdb_stdlog
, "infrun: no stepping, continue\n");
3624 /* Likewise if we aren't even stepping. */
3629 /* If stepping through a line, keep going if still within it.
3631 Note that step_range_end is the address of the first instruction
3632 beyond the step range, and NOT the address of the last instruction
3634 if (stop_pc
>= ecs
->event_thread
->step_range_start
3635 && stop_pc
< ecs
->event_thread
->step_range_end
)
3638 fprintf_unfiltered (gdb_stdlog
, "infrun: stepping inside range [0x%s-0x%s]\n",
3639 paddr_nz (ecs
->event_thread
->step_range_start
),
3640 paddr_nz (ecs
->event_thread
->step_range_end
));
3642 /* When stepping backward, stop at beginning of line range
3643 (unless it's the function entry point, in which case
3644 keep going back to the call point). */
3645 if (stop_pc
== ecs
->event_thread
->step_range_start
3646 && stop_pc
!= ecs
->stop_func_start
3647 && execution_direction
== EXEC_REVERSE
)
3649 ecs
->event_thread
->stop_step
= 1;
3650 print_stop_reason (END_STEPPING_RANGE
, 0);
3651 stop_stepping (ecs
);
3659 /* We stepped out of the stepping range. */
3661 /* If we are stepping at the source level and entered the runtime
3662 loader dynamic symbol resolution code, we keep on single stepping
3663 until we exit the run time loader code and reach the callee's
3665 if (ecs
->event_thread
->step_over_calls
== STEP_OVER_UNDEBUGGABLE
3666 && in_solib_dynsym_resolve_code (stop_pc
))
3668 CORE_ADDR pc_after_resolver
=
3669 gdbarch_skip_solib_resolver (gdbarch
, stop_pc
);
3672 fprintf_unfiltered (gdb_stdlog
, "infrun: stepped into dynsym resolve code\n");
3674 if (pc_after_resolver
)
3676 /* Set up a step-resume breakpoint at the address
3677 indicated by SKIP_SOLIB_RESOLVER. */
3678 struct symtab_and_line sr_sal
;
3680 sr_sal
.pc
= pc_after_resolver
;
3682 insert_step_resume_breakpoint_at_sal (sr_sal
, null_frame_id
);
3689 if (ecs
->event_thread
->step_range_end
!= 1
3690 && (ecs
->event_thread
->step_over_calls
== STEP_OVER_UNDEBUGGABLE
3691 || ecs
->event_thread
->step_over_calls
== STEP_OVER_ALL
)
3692 && get_frame_type (frame
) == SIGTRAMP_FRAME
)
3695 fprintf_unfiltered (gdb_stdlog
, "infrun: stepped into signal trampoline\n");
3696 /* The inferior, while doing a "step" or "next", has ended up in
3697 a signal trampoline (either by a signal being delivered or by
3698 the signal handler returning). Just single-step until the
3699 inferior leaves the trampoline (either by calling the handler
3705 /* Check for subroutine calls. The check for the current frame
3706 equalling the step ID is not necessary - the check of the
3707 previous frame's ID is sufficient - but it is a common case and
3708 cheaper than checking the previous frame's ID.
3710 NOTE: frame_id_eq will never report two invalid frame IDs as
3711 being equal, so to get into this block, both the current and
3712 previous frame must have valid frame IDs. */
3713 if (!frame_id_eq (get_frame_id (frame
),
3714 ecs
->event_thread
->step_frame_id
)
3715 && (frame_id_eq (frame_unwind_id (frame
),
3716 ecs
->event_thread
->step_frame_id
)
3717 || execution_direction
== EXEC_REVERSE
))
3719 CORE_ADDR real_stop_pc
;
3722 fprintf_unfiltered (gdb_stdlog
, "infrun: stepped into subroutine\n");
3724 if ((ecs
->event_thread
->step_over_calls
== STEP_OVER_NONE
)
3725 || ((ecs
->event_thread
->step_range_end
== 1)
3726 && in_prologue (gdbarch
, ecs
->event_thread
->prev_pc
,
3727 ecs
->stop_func_start
)))
3729 /* I presume that step_over_calls is only 0 when we're
3730 supposed to be stepping at the assembly language level
3731 ("stepi"). Just stop. */
3732 /* Also, maybe we just did a "nexti" inside a prolog, so we
3733 thought it was a subroutine call but it was not. Stop as
3735 ecs
->event_thread
->stop_step
= 1;
3736 print_stop_reason (END_STEPPING_RANGE
, 0);
3737 stop_stepping (ecs
);
3741 if (ecs
->event_thread
->step_over_calls
== STEP_OVER_ALL
)
3743 /* We're doing a "next".
3745 Normal (forward) execution: set a breakpoint at the
3746 callee's return address (the address at which the caller
3749 Reverse (backward) execution. set the step-resume
3750 breakpoint at the start of the function that we just
3751 stepped into (backwards), and continue to there. When we
3752 get there, we'll need to single-step back to the caller. */
3754 if (execution_direction
== EXEC_REVERSE
)
3756 struct symtab_and_line sr_sal
;
3758 if (ecs
->stop_func_start
== 0
3759 && in_solib_dynsym_resolve_code (stop_pc
))
3761 /* Stepped into runtime loader dynamic symbol
3762 resolution code. Since we're in reverse,
3763 we have already backed up through the runtime
3764 loader and the dynamic function. This is just
3765 the trampoline (jump table).
3767 Just keep stepping, we'll soon be home.
3772 /* Normal (staticly linked) function call return. */
3774 sr_sal
.pc
= ecs
->stop_func_start
;
3775 insert_step_resume_breakpoint_at_sal (sr_sal
, null_frame_id
);
3778 insert_step_resume_breakpoint_at_caller (frame
);
3784 /* If we are in a function call trampoline (a stub between the
3785 calling routine and the real function), locate the real
3786 function. That's what tells us (a) whether we want to step
3787 into it at all, and (b) what prologue we want to run to the
3788 end of, if we do step into it. */
3789 real_stop_pc
= skip_language_trampoline (frame
, stop_pc
);
3790 if (real_stop_pc
== 0)
3791 real_stop_pc
= gdbarch_skip_trampoline_code (gdbarch
, frame
, stop_pc
);
3792 if (real_stop_pc
!= 0)
3793 ecs
->stop_func_start
= real_stop_pc
;
3795 if (real_stop_pc
!= 0 && in_solib_dynsym_resolve_code (real_stop_pc
))
3797 struct symtab_and_line sr_sal
;
3799 sr_sal
.pc
= ecs
->stop_func_start
;
3801 insert_step_resume_breakpoint_at_sal (sr_sal
, null_frame_id
);
3806 /* If we have line number information for the function we are
3807 thinking of stepping into, step into it.
3809 If there are several symtabs at that PC (e.g. with include
3810 files), just want to know whether *any* of them have line
3811 numbers. find_pc_line handles this. */
3813 struct symtab_and_line tmp_sal
;
3815 tmp_sal
= find_pc_line (ecs
->stop_func_start
, 0);
3816 if (tmp_sal
.line
!= 0)
3818 if (execution_direction
== EXEC_REVERSE
)
3819 handle_step_into_function_backward (gdbarch
, ecs
);
3821 handle_step_into_function (gdbarch
, ecs
);
3826 /* If we have no line number and the step-stop-if-no-debug is
3827 set, we stop the step so that the user has a chance to switch
3828 in assembly mode. */
3829 if (ecs
->event_thread
->step_over_calls
== STEP_OVER_UNDEBUGGABLE
3830 && step_stop_if_no_debug
)
3832 ecs
->event_thread
->stop_step
= 1;
3833 print_stop_reason (END_STEPPING_RANGE
, 0);
3834 stop_stepping (ecs
);
3838 if (execution_direction
== EXEC_REVERSE
)
3840 /* Set a breakpoint at callee's start address.
3841 From there we can step once and be back in the caller. */
3842 struct symtab_and_line sr_sal
;
3844 sr_sal
.pc
= ecs
->stop_func_start
;
3845 insert_step_resume_breakpoint_at_sal (sr_sal
, null_frame_id
);
3848 /* Set a breakpoint at callee's return address (the address
3849 at which the caller will resume). */
3850 insert_step_resume_breakpoint_at_caller (frame
);
3856 /* If we're in the return path from a shared library trampoline,
3857 we want to proceed through the trampoline when stepping. */
3858 if (gdbarch_in_solib_return_trampoline (gdbarch
,
3859 stop_pc
, ecs
->stop_func_name
))
3861 /* Determine where this trampoline returns. */
3862 CORE_ADDR real_stop_pc
;
3863 real_stop_pc
= gdbarch_skip_trampoline_code (gdbarch
, frame
, stop_pc
);
3866 fprintf_unfiltered (gdb_stdlog
, "infrun: stepped into solib return tramp\n");
3868 /* Only proceed through if we know where it's going. */
3871 /* And put the step-breakpoint there and go until there. */
3872 struct symtab_and_line sr_sal
;
3874 init_sal (&sr_sal
); /* initialize to zeroes */
3875 sr_sal
.pc
= real_stop_pc
;
3876 sr_sal
.section
= find_pc_overlay (sr_sal
.pc
);
3878 /* Do not specify what the fp should be when we stop since
3879 on some machines the prologue is where the new fp value
3881 insert_step_resume_breakpoint_at_sal (sr_sal
, null_frame_id
);
3883 /* Restart without fiddling with the step ranges or
3890 stop_pc_sal
= find_pc_line (stop_pc
, 0);
3892 /* NOTE: tausq/2004-05-24: This if block used to be done before all
3893 the trampoline processing logic, however, there are some trampolines
3894 that have no names, so we should do trampoline handling first. */
3895 if (ecs
->event_thread
->step_over_calls
== STEP_OVER_UNDEBUGGABLE
3896 && ecs
->stop_func_name
== NULL
3897 && stop_pc_sal
.line
== 0)
3900 fprintf_unfiltered (gdb_stdlog
, "infrun: stepped into undebuggable function\n");
3902 /* The inferior just stepped into, or returned to, an
3903 undebuggable function (where there is no debugging information
3904 and no line number corresponding to the address where the
3905 inferior stopped). Since we want to skip this kind of code,
3906 we keep going until the inferior returns from this
3907 function - unless the user has asked us not to (via
3908 set step-mode) or we no longer know how to get back
3909 to the call site. */
3910 if (step_stop_if_no_debug
3911 || !frame_id_p (frame_unwind_id (frame
)))
3913 /* If we have no line number and the step-stop-if-no-debug
3914 is set, we stop the step so that the user has a chance to
3915 switch in assembly mode. */
3916 ecs
->event_thread
->stop_step
= 1;
3917 print_stop_reason (END_STEPPING_RANGE
, 0);
3918 stop_stepping (ecs
);
3923 /* Set a breakpoint at callee's return address (the address
3924 at which the caller will resume). */
3925 insert_step_resume_breakpoint_at_caller (frame
);
3931 if (ecs
->event_thread
->step_range_end
== 1)
3933 /* It is stepi or nexti. We always want to stop stepping after
3936 fprintf_unfiltered (gdb_stdlog
, "infrun: stepi/nexti\n");
3937 ecs
->event_thread
->stop_step
= 1;
3938 print_stop_reason (END_STEPPING_RANGE
, 0);
3939 stop_stepping (ecs
);
3943 if (stop_pc_sal
.line
== 0)
3945 /* We have no line number information. That means to stop
3946 stepping (does this always happen right after one instruction,
3947 when we do "s" in a function with no line numbers,
3948 or can this happen as a result of a return or longjmp?). */
3950 fprintf_unfiltered (gdb_stdlog
, "infrun: no line number info\n");
3951 ecs
->event_thread
->stop_step
= 1;
3952 print_stop_reason (END_STEPPING_RANGE
, 0);
3953 stop_stepping (ecs
);
3957 if ((stop_pc
== stop_pc_sal
.pc
)
3958 && (ecs
->event_thread
->current_line
!= stop_pc_sal
.line
3959 || ecs
->event_thread
->current_symtab
!= stop_pc_sal
.symtab
))
3961 /* We are at the start of a different line. So stop. Note that
3962 we don't stop if we step into the middle of a different line.
3963 That is said to make things like for (;;) statements work
3966 fprintf_unfiltered (gdb_stdlog
, "infrun: stepped to a different line\n");
3967 ecs
->event_thread
->stop_step
= 1;
3968 print_stop_reason (END_STEPPING_RANGE
, 0);
3969 stop_stepping (ecs
);
3973 /* We aren't done stepping.
3975 Optimize by setting the stepping range to the line.
3976 (We might not be in the original line, but if we entered a
3977 new line in mid-statement, we continue stepping. This makes
3978 things like for(;;) statements work better.) */
3980 ecs
->event_thread
->step_range_start
= stop_pc_sal
.pc
;
3981 ecs
->event_thread
->step_range_end
= stop_pc_sal
.end
;
3982 ecs
->event_thread
->step_frame_id
= get_frame_id (frame
);
3983 ecs
->event_thread
->current_line
= stop_pc_sal
.line
;
3984 ecs
->event_thread
->current_symtab
= stop_pc_sal
.symtab
;
3987 fprintf_unfiltered (gdb_stdlog
, "infrun: keep going\n");
3991 /* Is thread TP in the middle of single-stepping? */
3994 currently_stepping (struct thread_info
*tp
)
3996 return ((tp
->step_range_end
&& tp
->step_resume_breakpoint
== NULL
)
3997 || tp
->trap_expected
3998 || tp
->stepping_through_solib_after_catch
3999 || bpstat_should_step ());
4002 /* Returns true if any thread *but* the one passed in "data" is in the
4003 middle of stepping or of handling a "next". */
4006 currently_stepping_or_nexting_callback (struct thread_info
*tp
, void *data
)
4011 return (tp
->step_range_end
4012 || tp
->trap_expected
4013 || tp
->stepping_through_solib_after_catch
);
4016 /* Inferior has stepped into a subroutine call with source code that
4017 we should not step over. Do step to the first line of code in
4021 handle_step_into_function (struct gdbarch
*gdbarch
,
4022 struct execution_control_state
*ecs
)
4025 struct symtab_and_line stop_func_sal
, sr_sal
;
4027 s
= find_pc_symtab (stop_pc
);
4028 if (s
&& s
->language
!= language_asm
)
4029 ecs
->stop_func_start
= gdbarch_skip_prologue (gdbarch
,
4030 ecs
->stop_func_start
);
4032 stop_func_sal
= find_pc_line (ecs
->stop_func_start
, 0);
4033 /* Use the step_resume_break to step until the end of the prologue,
4034 even if that involves jumps (as it seems to on the vax under
4036 /* If the prologue ends in the middle of a source line, continue to
4037 the end of that source line (if it is still within the function).
4038 Otherwise, just go to end of prologue. */
4039 if (stop_func_sal
.end
4040 && stop_func_sal
.pc
!= ecs
->stop_func_start
4041 && stop_func_sal
.end
< ecs
->stop_func_end
)
4042 ecs
->stop_func_start
= stop_func_sal
.end
;
4044 /* Architectures which require breakpoint adjustment might not be able
4045 to place a breakpoint at the computed address. If so, the test
4046 ``ecs->stop_func_start == stop_pc'' will never succeed. Adjust
4047 ecs->stop_func_start to an address at which a breakpoint may be
4048 legitimately placed.
4050 Note: kevinb/2004-01-19: On FR-V, if this adjustment is not
4051 made, GDB will enter an infinite loop when stepping through
4052 optimized code consisting of VLIW instructions which contain
4053 subinstructions corresponding to different source lines. On
4054 FR-V, it's not permitted to place a breakpoint on any but the
4055 first subinstruction of a VLIW instruction. When a breakpoint is
4056 set, GDB will adjust the breakpoint address to the beginning of
4057 the VLIW instruction. Thus, we need to make the corresponding
4058 adjustment here when computing the stop address. */
4060 if (gdbarch_adjust_breakpoint_address_p (gdbarch
))
4062 ecs
->stop_func_start
4063 = gdbarch_adjust_breakpoint_address (gdbarch
,
4064 ecs
->stop_func_start
);
4067 if (ecs
->stop_func_start
== stop_pc
)
4069 /* We are already there: stop now. */
4070 ecs
->event_thread
->stop_step
= 1;
4071 print_stop_reason (END_STEPPING_RANGE
, 0);
4072 stop_stepping (ecs
);
4077 /* Put the step-breakpoint there and go until there. */
4078 init_sal (&sr_sal
); /* initialize to zeroes */
4079 sr_sal
.pc
= ecs
->stop_func_start
;
4080 sr_sal
.section
= find_pc_overlay (ecs
->stop_func_start
);
4082 /* Do not specify what the fp should be when we stop since on
4083 some machines the prologue is where the new fp value is
4085 insert_step_resume_breakpoint_at_sal (sr_sal
, null_frame_id
);
4087 /* And make sure stepping stops right away then. */
4088 ecs
->event_thread
->step_range_end
= ecs
->event_thread
->step_range_start
;
4093 /* Inferior has stepped backward into a subroutine call with source
4094 code that we should not step over. Do step to the beginning of the
4095 last line of code in it. */
4098 handle_step_into_function_backward (struct gdbarch
*gdbarch
,
4099 struct execution_control_state
*ecs
)
4102 struct symtab_and_line stop_func_sal
, sr_sal
;
4104 s
= find_pc_symtab (stop_pc
);
4105 if (s
&& s
->language
!= language_asm
)
4106 ecs
->stop_func_start
= gdbarch_skip_prologue (gdbarch
,
4107 ecs
->stop_func_start
);
4109 stop_func_sal
= find_pc_line (stop_pc
, 0);
4111 /* OK, we're just going to keep stepping here. */
4112 if (stop_func_sal
.pc
== stop_pc
)
4114 /* We're there already. Just stop stepping now. */
4115 ecs
->event_thread
->stop_step
= 1;
4116 print_stop_reason (END_STEPPING_RANGE
, 0);
4117 stop_stepping (ecs
);
4121 /* Else just reset the step range and keep going.
4122 No step-resume breakpoint, they don't work for
4123 epilogues, which can have multiple entry paths. */
4124 ecs
->event_thread
->step_range_start
= stop_func_sal
.pc
;
4125 ecs
->event_thread
->step_range_end
= stop_func_sal
.end
;
4131 /* Insert a "step-resume breakpoint" at SR_SAL with frame ID SR_ID.
4132 This is used to both functions and to skip over code. */
4135 insert_step_resume_breakpoint_at_sal (struct symtab_and_line sr_sal
,
4136 struct frame_id sr_id
)
4138 /* There should never be more than one step-resume or longjmp-resume
4139 breakpoint per thread, so we should never be setting a new
4140 step_resume_breakpoint when one is already active. */
4141 gdb_assert (inferior_thread ()->step_resume_breakpoint
== NULL
);
4144 fprintf_unfiltered (gdb_stdlog
,
4145 "infrun: inserting step-resume breakpoint at 0x%s\n",
4146 paddr_nz (sr_sal
.pc
));
4148 inferior_thread ()->step_resume_breakpoint
4149 = set_momentary_breakpoint (sr_sal
, sr_id
, bp_step_resume
);
4152 /* Insert a "step-resume breakpoint" at RETURN_FRAME.pc. This is used
4153 to skip a potential signal handler.
4155 This is called with the interrupted function's frame. The signal
4156 handler, when it returns, will resume the interrupted function at
4160 insert_step_resume_breakpoint_at_frame (struct frame_info
*return_frame
)
4162 struct gdbarch
*gdbarch
= get_frame_arch (return_frame
);
4163 struct symtab_and_line sr_sal
;
4165 gdb_assert (return_frame
!= NULL
);
4166 init_sal (&sr_sal
); /* initialize to zeros */
4168 sr_sal
.pc
= gdbarch_addr_bits_remove (gdbarch
, get_frame_pc (return_frame
));
4169 sr_sal
.section
= find_pc_overlay (sr_sal
.pc
);
4171 insert_step_resume_breakpoint_at_sal (sr_sal
, get_frame_id (return_frame
));
4174 /* Similar to insert_step_resume_breakpoint_at_frame, except
4175 but a breakpoint at the previous frame's PC. This is used to
4176 skip a function after stepping into it (for "next" or if the called
4177 function has no debugging information).
4179 The current function has almost always been reached by single
4180 stepping a call or return instruction. NEXT_FRAME belongs to the
4181 current function, and the breakpoint will be set at the caller's
4184 This is a separate function rather than reusing
4185 insert_step_resume_breakpoint_at_frame in order to avoid
4186 get_prev_frame, which may stop prematurely (see the implementation
4187 of frame_unwind_id for an example). */
4190 insert_step_resume_breakpoint_at_caller (struct frame_info
*next_frame
)
4192 struct gdbarch
*gdbarch
= get_frame_arch (next_frame
);
4193 struct symtab_and_line sr_sal
;
4195 /* We shouldn't have gotten here if we don't know where the call site
4197 gdb_assert (frame_id_p (frame_unwind_id (next_frame
)));
4199 init_sal (&sr_sal
); /* initialize to zeros */
4201 sr_sal
.pc
= gdbarch_addr_bits_remove (gdbarch
, frame_pc_unwind (next_frame
));
4202 sr_sal
.section
= find_pc_overlay (sr_sal
.pc
);
4204 insert_step_resume_breakpoint_at_sal (sr_sal
, frame_unwind_id (next_frame
));
4207 /* Insert a "longjmp-resume" breakpoint at PC. This is used to set a
4208 new breakpoint at the target of a jmp_buf. The handling of
4209 longjmp-resume uses the same mechanisms used for handling
4210 "step-resume" breakpoints. */
4213 insert_longjmp_resume_breakpoint (CORE_ADDR pc
)
4215 /* There should never be more than one step-resume or longjmp-resume
4216 breakpoint per thread, so we should never be setting a new
4217 longjmp_resume_breakpoint when one is already active. */
4218 gdb_assert (inferior_thread ()->step_resume_breakpoint
== NULL
);
4221 fprintf_unfiltered (gdb_stdlog
,
4222 "infrun: inserting longjmp-resume breakpoint at 0x%s\n",
4225 inferior_thread ()->step_resume_breakpoint
=
4226 set_momentary_breakpoint_at_pc (pc
, bp_longjmp_resume
);
4230 stop_stepping (struct execution_control_state
*ecs
)
4233 fprintf_unfiltered (gdb_stdlog
, "infrun: stop_stepping\n");
4235 /* Let callers know we don't want to wait for the inferior anymore. */
4236 ecs
->wait_some_more
= 0;
4239 /* This function handles various cases where we need to continue
4240 waiting for the inferior. */
4241 /* (Used to be the keep_going: label in the old wait_for_inferior) */
4244 keep_going (struct execution_control_state
*ecs
)
4246 /* Save the pc before execution, to compare with pc after stop. */
4247 ecs
->event_thread
->prev_pc
4248 = regcache_read_pc (get_thread_regcache (ecs
->ptid
));
4250 /* If we did not do break;, it means we should keep running the
4251 inferior and not return to debugger. */
4253 if (ecs
->event_thread
->trap_expected
4254 && ecs
->event_thread
->stop_signal
!= TARGET_SIGNAL_TRAP
)
4256 /* We took a signal (which we are supposed to pass through to
4257 the inferior, else we'd not get here) and we haven't yet
4258 gotten our trap. Simply continue. */
4259 resume (currently_stepping (ecs
->event_thread
),
4260 ecs
->event_thread
->stop_signal
);
4264 /* Either the trap was not expected, but we are continuing
4265 anyway (the user asked that this signal be passed to the
4268 The signal was SIGTRAP, e.g. it was our signal, but we
4269 decided we should resume from it.
4271 We're going to run this baby now!
4273 Note that insert_breakpoints won't try to re-insert
4274 already inserted breakpoints. Therefore, we don't
4275 care if breakpoints were already inserted, or not. */
4277 if (ecs
->event_thread
->stepping_over_breakpoint
)
4279 struct regcache
*thread_regcache
= get_thread_regcache (ecs
->ptid
);
4280 if (!use_displaced_stepping (get_regcache_arch (thread_regcache
)))
4281 /* Since we can't do a displaced step, we have to remove
4282 the breakpoint while we step it. To keep things
4283 simple, we remove them all. */
4284 remove_breakpoints ();
4288 struct gdb_exception e
;
4289 /* Stop stepping when inserting breakpoints
4291 TRY_CATCH (e
, RETURN_MASK_ERROR
)
4293 insert_breakpoints ();
4297 stop_stepping (ecs
);
4302 ecs
->event_thread
->trap_expected
= ecs
->event_thread
->stepping_over_breakpoint
;
4304 /* Do not deliver SIGNAL_TRAP (except when the user explicitly
4305 specifies that such a signal should be delivered to the
4308 Typically, this would occure when a user is debugging a
4309 target monitor on a simulator: the target monitor sets a
4310 breakpoint; the simulator encounters this break-point and
4311 halts the simulation handing control to GDB; GDB, noteing
4312 that the break-point isn't valid, returns control back to the
4313 simulator; the simulator then delivers the hardware
4314 equivalent of a SIGNAL_TRAP to the program being debugged. */
4316 if (ecs
->event_thread
->stop_signal
== TARGET_SIGNAL_TRAP
4317 && !signal_program
[ecs
->event_thread
->stop_signal
])
4318 ecs
->event_thread
->stop_signal
= TARGET_SIGNAL_0
;
4320 resume (currently_stepping (ecs
->event_thread
),
4321 ecs
->event_thread
->stop_signal
);
4324 prepare_to_wait (ecs
);
4327 /* This function normally comes after a resume, before
4328 handle_inferior_event exits. It takes care of any last bits of
4329 housekeeping, and sets the all-important wait_some_more flag. */
4332 prepare_to_wait (struct execution_control_state
*ecs
)
4335 fprintf_unfiltered (gdb_stdlog
, "infrun: prepare_to_wait\n");
4336 if (infwait_state
== infwait_normal_state
)
4338 overlay_cache_invalid
= 1;
4340 /* We have to invalidate the registers BEFORE calling
4341 target_wait because they can be loaded from the target while
4342 in target_wait. This makes remote debugging a bit more
4343 efficient for those targets that provide critical registers
4344 as part of their normal status mechanism. */
4346 registers_changed ();
4347 waiton_ptid
= pid_to_ptid (-1);
4349 /* This is the old end of the while loop. Let everybody know we
4350 want to wait for the inferior some more and get called again
4352 ecs
->wait_some_more
= 1;
4355 /* Print why the inferior has stopped. We always print something when
4356 the inferior exits, or receives a signal. The rest of the cases are
4357 dealt with later on in normal_stop() and print_it_typical(). Ideally
4358 there should be a call to this function from handle_inferior_event()
4359 each time stop_stepping() is called.*/
4361 print_stop_reason (enum inferior_stop_reason stop_reason
, int stop_info
)
4363 switch (stop_reason
)
4365 case END_STEPPING_RANGE
:
4366 /* We are done with a step/next/si/ni command. */
4367 /* For now print nothing. */
4368 /* Print a message only if not in the middle of doing a "step n"
4369 operation for n > 1 */
4370 if (!inferior_thread ()->step_multi
4371 || !inferior_thread ()->stop_step
)
4372 if (ui_out_is_mi_like_p (uiout
))
4375 async_reason_lookup (EXEC_ASYNC_END_STEPPING_RANGE
));
4378 /* The inferior was terminated by a signal. */
4379 annotate_signalled ();
4380 if (ui_out_is_mi_like_p (uiout
))
4383 async_reason_lookup (EXEC_ASYNC_EXITED_SIGNALLED
));
4384 ui_out_text (uiout
, "\nProgram terminated with signal ");
4385 annotate_signal_name ();
4386 ui_out_field_string (uiout
, "signal-name",
4387 target_signal_to_name (stop_info
));
4388 annotate_signal_name_end ();
4389 ui_out_text (uiout
, ", ");
4390 annotate_signal_string ();
4391 ui_out_field_string (uiout
, "signal-meaning",
4392 target_signal_to_string (stop_info
));
4393 annotate_signal_string_end ();
4394 ui_out_text (uiout
, ".\n");
4395 ui_out_text (uiout
, "The program no longer exists.\n");
4398 /* The inferior program is finished. */
4399 annotate_exited (stop_info
);
4402 if (ui_out_is_mi_like_p (uiout
))
4403 ui_out_field_string (uiout
, "reason",
4404 async_reason_lookup (EXEC_ASYNC_EXITED
));
4405 ui_out_text (uiout
, "\nProgram exited with code ");
4406 ui_out_field_fmt (uiout
, "exit-code", "0%o",
4407 (unsigned int) stop_info
);
4408 ui_out_text (uiout
, ".\n");
4412 if (ui_out_is_mi_like_p (uiout
))
4415 async_reason_lookup (EXEC_ASYNC_EXITED_NORMALLY
));
4416 ui_out_text (uiout
, "\nProgram exited normally.\n");
4418 /* Support the --return-child-result option. */
4419 return_child_result_value
= stop_info
;
4421 case SIGNAL_RECEIVED
:
4422 /* Signal received. The signal table tells us to print about
4426 if (stop_info
== TARGET_SIGNAL_0
&& !ui_out_is_mi_like_p (uiout
))
4428 struct thread_info
*t
= inferior_thread ();
4430 ui_out_text (uiout
, "\n[");
4431 ui_out_field_string (uiout
, "thread-name",
4432 target_pid_to_str (t
->ptid
));
4433 ui_out_field_fmt (uiout
, "thread-id", "] #%d", t
->num
);
4434 ui_out_text (uiout
, " stopped");
4438 ui_out_text (uiout
, "\nProgram received signal ");
4439 annotate_signal_name ();
4440 if (ui_out_is_mi_like_p (uiout
))
4442 (uiout
, "reason", async_reason_lookup (EXEC_ASYNC_SIGNAL_RECEIVED
));
4443 ui_out_field_string (uiout
, "signal-name",
4444 target_signal_to_name (stop_info
));
4445 annotate_signal_name_end ();
4446 ui_out_text (uiout
, ", ");
4447 annotate_signal_string ();
4448 ui_out_field_string (uiout
, "signal-meaning",
4449 target_signal_to_string (stop_info
));
4450 annotate_signal_string_end ();
4452 ui_out_text (uiout
, ".\n");
4455 /* Reverse execution: target ran out of history info. */
4456 ui_out_text (uiout
, "\nNo more reverse-execution history.\n");
4459 internal_error (__FILE__
, __LINE__
,
4460 _("print_stop_reason: unrecognized enum value"));
4466 /* Here to return control to GDB when the inferior stops for real.
4467 Print appropriate messages, remove breakpoints, give terminal our modes.
4469 STOP_PRINT_FRAME nonzero means print the executing frame
4470 (pc, function, args, file, line number and line text).
4471 BREAKPOINTS_FAILED nonzero means stop was due to error
4472 attempting to insert breakpoints. */
4477 struct target_waitstatus last
;
4479 struct cleanup
*old_chain
= make_cleanup (null_cleanup
, NULL
);
4481 get_last_target_status (&last_ptid
, &last
);
4483 /* If an exception is thrown from this point on, make sure to
4484 propagate GDB's knowledge of the executing state to the
4485 frontend/user running state. A QUIT is an easy exception to see
4486 here, so do this before any filtered output. */
4488 make_cleanup (finish_thread_state_cleanup
, &minus_one_ptid
);
4489 else if (last
.kind
!= TARGET_WAITKIND_SIGNALLED
4490 && last
.kind
!= TARGET_WAITKIND_EXITED
)
4491 make_cleanup (finish_thread_state_cleanup
, &inferior_ptid
);
4493 /* In non-stop mode, we don't want GDB to switch threads behind the
4494 user's back, to avoid races where the user is typing a command to
4495 apply to thread x, but GDB switches to thread y before the user
4496 finishes entering the command. */
4498 /* As with the notification of thread events, we want to delay
4499 notifying the user that we've switched thread context until
4500 the inferior actually stops.
4502 There's no point in saying anything if the inferior has exited.
4503 Note that SIGNALLED here means "exited with a signal", not
4504 "received a signal". */
4506 && !ptid_equal (previous_inferior_ptid
, inferior_ptid
)
4507 && target_has_execution
4508 && last
.kind
!= TARGET_WAITKIND_SIGNALLED
4509 && last
.kind
!= TARGET_WAITKIND_EXITED
)
4511 target_terminal_ours_for_output ();
4512 printf_filtered (_("[Switching to %s]\n"),
4513 target_pid_to_str (inferior_ptid
));
4514 annotate_thread_changed ();
4515 previous_inferior_ptid
= inferior_ptid
;
4518 if (!breakpoints_always_inserted_mode () && target_has_execution
)
4520 if (remove_breakpoints ())
4522 target_terminal_ours_for_output ();
4523 printf_filtered (_("\
4524 Cannot remove breakpoints because program is no longer writable.\n\
4525 Further execution is probably impossible.\n"));
4529 /* If an auto-display called a function and that got a signal,
4530 delete that auto-display to avoid an infinite recursion. */
4532 if (stopped_by_random_signal
)
4533 disable_current_display ();
4535 /* Don't print a message if in the middle of doing a "step n"
4536 operation for n > 1 */
4537 if (target_has_execution
4538 && last
.kind
!= TARGET_WAITKIND_SIGNALLED
4539 && last
.kind
!= TARGET_WAITKIND_EXITED
4540 && inferior_thread ()->step_multi
4541 && inferior_thread ()->stop_step
)
4544 target_terminal_ours ();
4546 /* Set the current source location. This will also happen if we
4547 display the frame below, but the current SAL will be incorrect
4548 during a user hook-stop function. */
4549 if (has_stack_frames () && !stop_stack_dummy
)
4550 set_current_sal_from_frame (get_current_frame (), 1);
4552 /* Let the user/frontend see the threads as stopped. */
4553 do_cleanups (old_chain
);
4555 /* Look up the hook_stop and run it (CLI internally handles problem
4556 of stop_command's pre-hook not existing). */
4558 catch_errors (hook_stop_stub
, stop_command
,
4559 "Error while running hook_stop:\n", RETURN_MASK_ALL
);
4561 if (!has_stack_frames ())
4564 if (last
.kind
== TARGET_WAITKIND_SIGNALLED
4565 || last
.kind
== TARGET_WAITKIND_EXITED
)
4568 /* Select innermost stack frame - i.e., current frame is frame 0,
4569 and current location is based on that.
4570 Don't do this on return from a stack dummy routine,
4571 or if the program has exited. */
4573 if (!stop_stack_dummy
)
4575 select_frame (get_current_frame ());
4577 /* Print current location without a level number, if
4578 we have changed functions or hit a breakpoint.
4579 Print source line if we have one.
4580 bpstat_print() contains the logic deciding in detail
4581 what to print, based on the event(s) that just occurred. */
4583 /* If --batch-silent is enabled then there's no need to print the current
4584 source location, and to try risks causing an error message about
4585 missing source files. */
4586 if (stop_print_frame
&& !batch_silent
)
4590 int do_frame_printing
= 1;
4591 struct thread_info
*tp
= inferior_thread ();
4593 bpstat_ret
= bpstat_print (tp
->stop_bpstat
);
4597 /* If we had hit a shared library event breakpoint,
4598 bpstat_print would print out this message. If we hit
4599 an OS-level shared library event, do the same
4601 if (last
.kind
== TARGET_WAITKIND_LOADED
)
4603 printf_filtered (_("Stopped due to shared library event\n"));
4604 source_flag
= SRC_LINE
; /* something bogus */
4605 do_frame_printing
= 0;
4609 /* FIXME: cagney/2002-12-01: Given that a frame ID does
4610 (or should) carry around the function and does (or
4611 should) use that when doing a frame comparison. */
4613 && frame_id_eq (tp
->step_frame_id
,
4614 get_frame_id (get_current_frame ()))
4615 && step_start_function
== find_pc_function (stop_pc
))
4616 source_flag
= SRC_LINE
; /* finished step, just print source line */
4618 source_flag
= SRC_AND_LOC
; /* print location and source line */
4620 case PRINT_SRC_AND_LOC
:
4621 source_flag
= SRC_AND_LOC
; /* print location and source line */
4623 case PRINT_SRC_ONLY
:
4624 source_flag
= SRC_LINE
;
4627 source_flag
= SRC_LINE
; /* something bogus */
4628 do_frame_printing
= 0;
4631 internal_error (__FILE__
, __LINE__
, _("Unknown value."));
4634 /* The behavior of this routine with respect to the source
4636 SRC_LINE: Print only source line
4637 LOCATION: Print only location
4638 SRC_AND_LOC: Print location and source line */
4639 if (do_frame_printing
)
4640 print_stack_frame (get_selected_frame (NULL
), 0, source_flag
);
4642 /* Display the auto-display expressions. */
4647 /* Save the function value return registers, if we care.
4648 We might be about to restore their previous contents. */
4649 if (inferior_thread ()->proceed_to_finish
)
4651 /* This should not be necessary. */
4653 regcache_xfree (stop_registers
);
4655 /* NB: The copy goes through to the target picking up the value of
4656 all the registers. */
4657 stop_registers
= regcache_dup (get_current_regcache ());
4660 if (stop_stack_dummy
)
4662 /* Pop the empty frame that contains the stack dummy.
4663 This also restores inferior state prior to the call
4664 (struct inferior_thread_state). */
4665 struct frame_info
*frame
= get_current_frame ();
4666 gdb_assert (get_frame_type (frame
) == DUMMY_FRAME
);
4668 /* frame_pop() calls reinit_frame_cache as the last thing it does
4669 which means there's currently no selected frame. We don't need
4670 to re-establish a selected frame if the dummy call returns normally,
4671 that will be done by restore_inferior_status. However, we do have
4672 to handle the case where the dummy call is returning after being
4673 stopped (e.g. the dummy call previously hit a breakpoint). We
4674 can't know which case we have so just always re-establish a
4675 selected frame here. */
4676 select_frame (get_current_frame ());
4680 annotate_stopped ();
4682 /* Suppress the stop observer if we're in the middle of:
4684 - a step n (n > 1), as there still more steps to be done.
4686 - a "finish" command, as the observer will be called in
4687 finish_command_continuation, so it can include the inferior
4688 function's return value.
4690 - calling an inferior function, as we pretend we inferior didn't
4691 run at all. The return value of the call is handled by the
4692 expression evaluator, through call_function_by_hand. */
4694 if (!target_has_execution
4695 || last
.kind
== TARGET_WAITKIND_SIGNALLED
4696 || last
.kind
== TARGET_WAITKIND_EXITED
4697 || (!inferior_thread ()->step_multi
4698 && !(inferior_thread ()->stop_bpstat
4699 && inferior_thread ()->proceed_to_finish
)
4700 && !inferior_thread ()->in_infcall
))
4702 if (!ptid_equal (inferior_ptid
, null_ptid
))
4703 observer_notify_normal_stop (inferior_thread ()->stop_bpstat
,
4706 observer_notify_normal_stop (NULL
, stop_print_frame
);
4709 if (target_has_execution
)
4711 if (last
.kind
!= TARGET_WAITKIND_SIGNALLED
4712 && last
.kind
!= TARGET_WAITKIND_EXITED
)
4713 /* Delete the breakpoint we stopped at, if it wants to be deleted.
4714 Delete any breakpoint that is to be deleted at the next stop. */
4715 breakpoint_auto_delete (inferior_thread ()->stop_bpstat
);
4720 hook_stop_stub (void *cmd
)
4722 execute_cmd_pre_hook ((struct cmd_list_element
*) cmd
);
4727 signal_stop_state (int signo
)
4729 return signal_stop
[signo
];
4733 signal_print_state (int signo
)
4735 return signal_print
[signo
];
4739 signal_pass_state (int signo
)
4741 return signal_program
[signo
];
4745 signal_stop_update (int signo
, int state
)
4747 int ret
= signal_stop
[signo
];
4748 signal_stop
[signo
] = state
;
4753 signal_print_update (int signo
, int state
)
4755 int ret
= signal_print
[signo
];
4756 signal_print
[signo
] = state
;
4761 signal_pass_update (int signo
, int state
)
4763 int ret
= signal_program
[signo
];
4764 signal_program
[signo
] = state
;
4769 sig_print_header (void)
4771 printf_filtered (_("\
4772 Signal Stop\tPrint\tPass to program\tDescription\n"));
4776 sig_print_info (enum target_signal oursig
)
4778 const char *name
= target_signal_to_name (oursig
);
4779 int name_padding
= 13 - strlen (name
);
4781 if (name_padding
<= 0)
4784 printf_filtered ("%s", name
);
4785 printf_filtered ("%*.*s ", name_padding
, name_padding
, " ");
4786 printf_filtered ("%s\t", signal_stop
[oursig
] ? "Yes" : "No");
4787 printf_filtered ("%s\t", signal_print
[oursig
] ? "Yes" : "No");
4788 printf_filtered ("%s\t\t", signal_program
[oursig
] ? "Yes" : "No");
4789 printf_filtered ("%s\n", target_signal_to_string (oursig
));
4792 /* Specify how various signals in the inferior should be handled. */
4795 handle_command (char *args
, int from_tty
)
4798 int digits
, wordlen
;
4799 int sigfirst
, signum
, siglast
;
4800 enum target_signal oursig
;
4803 unsigned char *sigs
;
4804 struct cleanup
*old_chain
;
4808 error_no_arg (_("signal to handle"));
4811 /* Allocate and zero an array of flags for which signals to handle. */
4813 nsigs
= (int) TARGET_SIGNAL_LAST
;
4814 sigs
= (unsigned char *) alloca (nsigs
);
4815 memset (sigs
, 0, nsigs
);
4817 /* Break the command line up into args. */
4819 argv
= gdb_buildargv (args
);
4820 old_chain
= make_cleanup_freeargv (argv
);
4822 /* Walk through the args, looking for signal oursigs, signal names, and
4823 actions. Signal numbers and signal names may be interspersed with
4824 actions, with the actions being performed for all signals cumulatively
4825 specified. Signal ranges can be specified as <LOW>-<HIGH>. */
4827 while (*argv
!= NULL
)
4829 wordlen
= strlen (*argv
);
4830 for (digits
= 0; isdigit ((*argv
)[digits
]); digits
++)
4834 sigfirst
= siglast
= -1;
4836 if (wordlen
>= 1 && !strncmp (*argv
, "all", wordlen
))
4838 /* Apply action to all signals except those used by the
4839 debugger. Silently skip those. */
4842 siglast
= nsigs
- 1;
4844 else if (wordlen
>= 1 && !strncmp (*argv
, "stop", wordlen
))
4846 SET_SIGS (nsigs
, sigs
, signal_stop
);
4847 SET_SIGS (nsigs
, sigs
, signal_print
);
4849 else if (wordlen
>= 1 && !strncmp (*argv
, "ignore", wordlen
))
4851 UNSET_SIGS (nsigs
, sigs
, signal_program
);
4853 else if (wordlen
>= 2 && !strncmp (*argv
, "print", wordlen
))
4855 SET_SIGS (nsigs
, sigs
, signal_print
);
4857 else if (wordlen
>= 2 && !strncmp (*argv
, "pass", wordlen
))
4859 SET_SIGS (nsigs
, sigs
, signal_program
);
4861 else if (wordlen
>= 3 && !strncmp (*argv
, "nostop", wordlen
))
4863 UNSET_SIGS (nsigs
, sigs
, signal_stop
);
4865 else if (wordlen
>= 3 && !strncmp (*argv
, "noignore", wordlen
))
4867 SET_SIGS (nsigs
, sigs
, signal_program
);
4869 else if (wordlen
>= 4 && !strncmp (*argv
, "noprint", wordlen
))
4871 UNSET_SIGS (nsigs
, sigs
, signal_print
);
4872 UNSET_SIGS (nsigs
, sigs
, signal_stop
);
4874 else if (wordlen
>= 4 && !strncmp (*argv
, "nopass", wordlen
))
4876 UNSET_SIGS (nsigs
, sigs
, signal_program
);
4878 else if (digits
> 0)
4880 /* It is numeric. The numeric signal refers to our own
4881 internal signal numbering from target.h, not to host/target
4882 signal number. This is a feature; users really should be
4883 using symbolic names anyway, and the common ones like
4884 SIGHUP, SIGINT, SIGALRM, etc. will work right anyway. */
4886 sigfirst
= siglast
= (int)
4887 target_signal_from_command (atoi (*argv
));
4888 if ((*argv
)[digits
] == '-')
4891 target_signal_from_command (atoi ((*argv
) + digits
+ 1));
4893 if (sigfirst
> siglast
)
4895 /* Bet he didn't figure we'd think of this case... */
4903 oursig
= target_signal_from_name (*argv
);
4904 if (oursig
!= TARGET_SIGNAL_UNKNOWN
)
4906 sigfirst
= siglast
= (int) oursig
;
4910 /* Not a number and not a recognized flag word => complain. */
4911 error (_("Unrecognized or ambiguous flag word: \"%s\"."), *argv
);
4915 /* If any signal numbers or symbol names were found, set flags for
4916 which signals to apply actions to. */
4918 for (signum
= sigfirst
; signum
>= 0 && signum
<= siglast
; signum
++)
4920 switch ((enum target_signal
) signum
)
4922 case TARGET_SIGNAL_TRAP
:
4923 case TARGET_SIGNAL_INT
:
4924 if (!allsigs
&& !sigs
[signum
])
4926 if (query (_("%s is used by the debugger.\n\
4927 Are you sure you want to change it? "), target_signal_to_name ((enum target_signal
) signum
)))
4933 printf_unfiltered (_("Not confirmed, unchanged.\n"));
4934 gdb_flush (gdb_stdout
);
4938 case TARGET_SIGNAL_0
:
4939 case TARGET_SIGNAL_DEFAULT
:
4940 case TARGET_SIGNAL_UNKNOWN
:
4941 /* Make sure that "all" doesn't print these. */
4952 for (signum
= 0; signum
< nsigs
; signum
++)
4955 target_notice_signals (inferior_ptid
);
4959 /* Show the results. */
4960 sig_print_header ();
4961 for (; signum
< nsigs
; signum
++)
4963 sig_print_info (signum
);
4969 do_cleanups (old_chain
);
4973 xdb_handle_command (char *args
, int from_tty
)
4976 struct cleanup
*old_chain
;
4979 error_no_arg (_("xdb command"));
4981 /* Break the command line up into args. */
4983 argv
= gdb_buildargv (args
);
4984 old_chain
= make_cleanup_freeargv (argv
);
4985 if (argv
[1] != (char *) NULL
)
4990 bufLen
= strlen (argv
[0]) + 20;
4991 argBuf
= (char *) xmalloc (bufLen
);
4995 enum target_signal oursig
;
4997 oursig
= target_signal_from_name (argv
[0]);
4998 memset (argBuf
, 0, bufLen
);
4999 if (strcmp (argv
[1], "Q") == 0)
5000 sprintf (argBuf
, "%s %s", argv
[0], "noprint");
5003 if (strcmp (argv
[1], "s") == 0)
5005 if (!signal_stop
[oursig
])
5006 sprintf (argBuf
, "%s %s", argv
[0], "stop");
5008 sprintf (argBuf
, "%s %s", argv
[0], "nostop");
5010 else if (strcmp (argv
[1], "i") == 0)
5012 if (!signal_program
[oursig
])
5013 sprintf (argBuf
, "%s %s", argv
[0], "pass");
5015 sprintf (argBuf
, "%s %s", argv
[0], "nopass");
5017 else if (strcmp (argv
[1], "r") == 0)
5019 if (!signal_print
[oursig
])
5020 sprintf (argBuf
, "%s %s", argv
[0], "print");
5022 sprintf (argBuf
, "%s %s", argv
[0], "noprint");
5028 handle_command (argBuf
, from_tty
);
5030 printf_filtered (_("Invalid signal handling flag.\n"));
5035 do_cleanups (old_chain
);
5038 /* Print current contents of the tables set by the handle command.
5039 It is possible we should just be printing signals actually used
5040 by the current target (but for things to work right when switching
5041 targets, all signals should be in the signal tables). */
5044 signals_info (char *signum_exp
, int from_tty
)
5046 enum target_signal oursig
;
5047 sig_print_header ();
5051 /* First see if this is a symbol name. */
5052 oursig
= target_signal_from_name (signum_exp
);
5053 if (oursig
== TARGET_SIGNAL_UNKNOWN
)
5055 /* No, try numeric. */
5057 target_signal_from_command (parse_and_eval_long (signum_exp
));
5059 sig_print_info (oursig
);
5063 printf_filtered ("\n");
5064 /* These ugly casts brought to you by the native VAX compiler. */
5065 for (oursig
= TARGET_SIGNAL_FIRST
;
5066 (int) oursig
< (int) TARGET_SIGNAL_LAST
;
5067 oursig
= (enum target_signal
) ((int) oursig
+ 1))
5071 if (oursig
!= TARGET_SIGNAL_UNKNOWN
5072 && oursig
!= TARGET_SIGNAL_DEFAULT
&& oursig
!= TARGET_SIGNAL_0
)
5073 sig_print_info (oursig
);
5076 printf_filtered (_("\nUse the \"handle\" command to change these tables.\n"));
5079 /* The $_siginfo convenience variable is a bit special. We don't know
5080 for sure the type of the value until we actually have a chance to
5081 fetch the data. The type can change depending on gdbarch, so it it
5082 also dependent on which thread you have selected.
5084 1. making $_siginfo be an internalvar that creates a new value on
5087 2. making the value of $_siginfo be an lval_computed value. */
5089 /* This function implements the lval_computed support for reading a
5093 siginfo_value_read (struct value
*v
)
5095 LONGEST transferred
;
5098 target_read (¤t_target
, TARGET_OBJECT_SIGNAL_INFO
,
5100 value_contents_all_raw (v
),
5102 TYPE_LENGTH (value_type (v
)));
5104 if (transferred
!= TYPE_LENGTH (value_type (v
)))
5105 error (_("Unable to read siginfo"));
5108 /* This function implements the lval_computed support for writing a
5112 siginfo_value_write (struct value
*v
, struct value
*fromval
)
5114 LONGEST transferred
;
5116 transferred
= target_write (¤t_target
,
5117 TARGET_OBJECT_SIGNAL_INFO
,
5119 value_contents_all_raw (fromval
),
5121 TYPE_LENGTH (value_type (fromval
)));
5123 if (transferred
!= TYPE_LENGTH (value_type (fromval
)))
5124 error (_("Unable to write siginfo"));
5127 static struct lval_funcs siginfo_value_funcs
=
5133 /* Return a new value with the correct type for the siginfo object of
5134 the current thread. Return a void value if there's no object
5137 static struct value
*
5138 siginfo_make_value (struct internalvar
*var
)
5141 struct gdbarch
*gdbarch
;
5143 if (target_has_stack
5144 && !ptid_equal (inferior_ptid
, null_ptid
))
5146 gdbarch
= get_frame_arch (get_current_frame ());
5148 if (gdbarch_get_siginfo_type_p (gdbarch
))
5150 type
= gdbarch_get_siginfo_type (gdbarch
);
5152 return allocate_computed_value (type
, &siginfo_value_funcs
, NULL
);
5156 return allocate_value (builtin_type_void
);
5160 /* Inferior thread state.
5161 These are details related to the inferior itself, and don't include
5162 things like what frame the user had selected or what gdb was doing
5163 with the target at the time.
5164 For inferior function calls these are things we want to restore
5165 regardless of whether the function call successfully completes
5166 or the dummy frame has to be manually popped. */
5168 struct inferior_thread_state
5170 enum target_signal stop_signal
;
5172 struct regcache
*registers
;
5175 struct inferior_thread_state
*
5176 save_inferior_thread_state (void)
5178 struct inferior_thread_state
*inf_state
= XMALLOC (struct inferior_thread_state
);
5179 struct thread_info
*tp
= inferior_thread ();
5181 inf_state
->stop_signal
= tp
->stop_signal
;
5182 inf_state
->stop_pc
= stop_pc
;
5184 inf_state
->registers
= regcache_dup (get_current_regcache ());
5189 /* Restore inferior session state to INF_STATE. */
5192 restore_inferior_thread_state (struct inferior_thread_state
*inf_state
)
5194 struct thread_info
*tp
= inferior_thread ();
5196 tp
->stop_signal
= inf_state
->stop_signal
;
5197 stop_pc
= inf_state
->stop_pc
;
5199 /* The inferior can be gone if the user types "print exit(0)"
5200 (and perhaps other times). */
5201 if (target_has_execution
)
5202 /* NB: The register write goes through to the target. */
5203 regcache_cpy (get_current_regcache (), inf_state
->registers
);
5204 regcache_xfree (inf_state
->registers
);
5209 do_restore_inferior_thread_state_cleanup (void *state
)
5211 restore_inferior_thread_state (state
);
5215 make_cleanup_restore_inferior_thread_state (struct inferior_thread_state
*inf_state
)
5217 return make_cleanup (do_restore_inferior_thread_state_cleanup
, inf_state
);
5221 discard_inferior_thread_state (struct inferior_thread_state
*inf_state
)
5223 regcache_xfree (inf_state
->registers
);
5228 get_inferior_thread_state_regcache (struct inferior_thread_state
*inf_state
)
5230 return inf_state
->registers
;
5233 /* Session related state for inferior function calls.
5234 These are the additional bits of state that need to be restored
5235 when an inferior function call successfully completes. */
5237 struct inferior_status
5241 int stop_stack_dummy
;
5242 int stopped_by_random_signal
;
5243 int stepping_over_breakpoint
;
5244 CORE_ADDR step_range_start
;
5245 CORE_ADDR step_range_end
;
5246 struct frame_id step_frame_id
;
5247 enum step_over_calls_kind step_over_calls
;
5248 CORE_ADDR step_resume_break_address
;
5249 int stop_after_trap
;
5252 /* ID if the selected frame when the inferior function call was made. */
5253 struct frame_id selected_frame_id
;
5255 int proceed_to_finish
;
5259 /* Save all of the information associated with the inferior<==>gdb
5262 struct inferior_status
*
5263 save_inferior_status (void)
5265 struct inferior_status
*inf_status
= XMALLOC (struct inferior_status
);
5266 struct thread_info
*tp
= inferior_thread ();
5267 struct inferior
*inf
= current_inferior ();
5269 inf_status
->stop_step
= tp
->stop_step
;
5270 inf_status
->stop_stack_dummy
= stop_stack_dummy
;
5271 inf_status
->stopped_by_random_signal
= stopped_by_random_signal
;
5272 inf_status
->stepping_over_breakpoint
= tp
->trap_expected
;
5273 inf_status
->step_range_start
= tp
->step_range_start
;
5274 inf_status
->step_range_end
= tp
->step_range_end
;
5275 inf_status
->step_frame_id
= tp
->step_frame_id
;
5276 inf_status
->step_over_calls
= tp
->step_over_calls
;
5277 inf_status
->stop_after_trap
= stop_after_trap
;
5278 inf_status
->stop_soon
= inf
->stop_soon
;
5279 /* Save original bpstat chain here; replace it with copy of chain.
5280 If caller's caller is walking the chain, they'll be happier if we
5281 hand them back the original chain when restore_inferior_status is
5283 inf_status
->stop_bpstat
= tp
->stop_bpstat
;
5284 tp
->stop_bpstat
= bpstat_copy (tp
->stop_bpstat
);
5285 inf_status
->proceed_to_finish
= tp
->proceed_to_finish
;
5286 inf_status
->in_infcall
= tp
->in_infcall
;
5288 inf_status
->selected_frame_id
= get_frame_id (get_selected_frame (NULL
));
5294 restore_selected_frame (void *args
)
5296 struct frame_id
*fid
= (struct frame_id
*) args
;
5297 struct frame_info
*frame
;
5299 frame
= frame_find_by_id (*fid
);
5301 /* If inf_status->selected_frame_id is NULL, there was no previously
5305 warning (_("Unable to restore previously selected frame."));
5309 select_frame (frame
);
5314 /* Restore inferior session state to INF_STATUS. */
5317 restore_inferior_status (struct inferior_status
*inf_status
)
5319 struct thread_info
*tp
= inferior_thread ();
5320 struct inferior
*inf
= current_inferior ();
5322 tp
->stop_step
= inf_status
->stop_step
;
5323 stop_stack_dummy
= inf_status
->stop_stack_dummy
;
5324 stopped_by_random_signal
= inf_status
->stopped_by_random_signal
;
5325 tp
->trap_expected
= inf_status
->stepping_over_breakpoint
;
5326 tp
->step_range_start
= inf_status
->step_range_start
;
5327 tp
->step_range_end
= inf_status
->step_range_end
;
5328 tp
->step_frame_id
= inf_status
->step_frame_id
;
5329 tp
->step_over_calls
= inf_status
->step_over_calls
;
5330 stop_after_trap
= inf_status
->stop_after_trap
;
5331 inf
->stop_soon
= inf_status
->stop_soon
;
5332 bpstat_clear (&tp
->stop_bpstat
);
5333 tp
->stop_bpstat
= inf_status
->stop_bpstat
;
5334 inf_status
->stop_bpstat
= NULL
;
5335 tp
->proceed_to_finish
= inf_status
->proceed_to_finish
;
5336 tp
->in_infcall
= inf_status
->in_infcall
;
5338 if (target_has_stack
)
5340 /* The point of catch_errors is that if the stack is clobbered,
5341 walking the stack might encounter a garbage pointer and
5342 error() trying to dereference it. */
5344 (restore_selected_frame
, &inf_status
->selected_frame_id
,
5345 "Unable to restore previously selected frame:\n",
5346 RETURN_MASK_ERROR
) == 0)
5347 /* Error in restoring the selected frame. Select the innermost
5349 select_frame (get_current_frame ());
5356 do_restore_inferior_status_cleanup (void *sts
)
5358 restore_inferior_status (sts
);
5362 make_cleanup_restore_inferior_status (struct inferior_status
*inf_status
)
5364 return make_cleanup (do_restore_inferior_status_cleanup
, inf_status
);
5368 discard_inferior_status (struct inferior_status
*inf_status
)
5370 /* See save_inferior_status for info on stop_bpstat. */
5371 bpstat_clear (&inf_status
->stop_bpstat
);
5376 inferior_has_forked (ptid_t pid
, ptid_t
*child_pid
)
5378 struct target_waitstatus last
;
5381 get_last_target_status (&last_ptid
, &last
);
5383 if (last
.kind
!= TARGET_WAITKIND_FORKED
)
5386 if (!ptid_equal (last_ptid
, pid
))
5389 *child_pid
= last
.value
.related_pid
;
5394 inferior_has_vforked (ptid_t pid
, ptid_t
*child_pid
)
5396 struct target_waitstatus last
;
5399 get_last_target_status (&last_ptid
, &last
);
5401 if (last
.kind
!= TARGET_WAITKIND_VFORKED
)
5404 if (!ptid_equal (last_ptid
, pid
))
5407 *child_pid
= last
.value
.related_pid
;
5412 inferior_has_execd (ptid_t pid
, char **execd_pathname
)
5414 struct target_waitstatus last
;
5417 get_last_target_status (&last_ptid
, &last
);
5419 if (last
.kind
!= TARGET_WAITKIND_EXECD
)
5422 if (!ptid_equal (last_ptid
, pid
))
5425 *execd_pathname
= xstrdup (last
.value
.execd_pathname
);
5429 /* Oft used ptids */
5431 ptid_t minus_one_ptid
;
5433 /* Create a ptid given the necessary PID, LWP, and TID components. */
5436 ptid_build (int pid
, long lwp
, long tid
)
5446 /* Create a ptid from just a pid. */
5449 pid_to_ptid (int pid
)
5451 return ptid_build (pid
, 0, 0);
5454 /* Fetch the pid (process id) component from a ptid. */
5457 ptid_get_pid (ptid_t ptid
)
5462 /* Fetch the lwp (lightweight process) component from a ptid. */
5465 ptid_get_lwp (ptid_t ptid
)
5470 /* Fetch the tid (thread id) component from a ptid. */
5473 ptid_get_tid (ptid_t ptid
)
5478 /* ptid_equal() is used to test equality of two ptids. */
5481 ptid_equal (ptid_t ptid1
, ptid_t ptid2
)
5483 return (ptid1
.pid
== ptid2
.pid
&& ptid1
.lwp
== ptid2
.lwp
5484 && ptid1
.tid
== ptid2
.tid
);
5487 /* Returns true if PTID represents a process. */
5490 ptid_is_pid (ptid_t ptid
)
5492 if (ptid_equal (minus_one_ptid
, ptid
))
5494 if (ptid_equal (null_ptid
, ptid
))
5497 return (ptid_get_lwp (ptid
) == 0 && ptid_get_tid (ptid
) == 0);
5500 /* restore_inferior_ptid() will be used by the cleanup machinery
5501 to restore the inferior_ptid value saved in a call to
5502 save_inferior_ptid(). */
5505 restore_inferior_ptid (void *arg
)
5507 ptid_t
*saved_ptid_ptr
= arg
;
5508 inferior_ptid
= *saved_ptid_ptr
;
5512 /* Save the value of inferior_ptid so that it may be restored by a
5513 later call to do_cleanups(). Returns the struct cleanup pointer
5514 needed for later doing the cleanup. */
5517 save_inferior_ptid (void)
5519 ptid_t
*saved_ptid_ptr
;
5521 saved_ptid_ptr
= xmalloc (sizeof (ptid_t
));
5522 *saved_ptid_ptr
= inferior_ptid
;
5523 return make_cleanup (restore_inferior_ptid
, saved_ptid_ptr
);
5527 /* User interface for reverse debugging:
5528 Set exec-direction / show exec-direction commands
5529 (returns error unless target implements to_set_exec_direction method). */
5531 enum exec_direction_kind execution_direction
= EXEC_FORWARD
;
5532 static const char exec_forward
[] = "forward";
5533 static const char exec_reverse
[] = "reverse";
5534 static const char *exec_direction
= exec_forward
;
5535 static const char *exec_direction_names
[] = {
5542 set_exec_direction_func (char *args
, int from_tty
,
5543 struct cmd_list_element
*cmd
)
5545 if (target_can_execute_reverse
)
5547 if (!strcmp (exec_direction
, exec_forward
))
5548 execution_direction
= EXEC_FORWARD
;
5549 else if (!strcmp (exec_direction
, exec_reverse
))
5550 execution_direction
= EXEC_REVERSE
;
5555 show_exec_direction_func (struct ui_file
*out
, int from_tty
,
5556 struct cmd_list_element
*cmd
, const char *value
)
5558 switch (execution_direction
) {
5560 fprintf_filtered (out
, _("Forward.\n"));
5563 fprintf_filtered (out
, _("Reverse.\n"));
5567 fprintf_filtered (out
,
5568 _("Forward (target `%s' does not support exec-direction).\n"),
5574 /* User interface for non-stop mode. */
5577 static int non_stop_1
= 0;
5580 set_non_stop (char *args
, int from_tty
,
5581 struct cmd_list_element
*c
)
5583 if (target_has_execution
)
5585 non_stop_1
= non_stop
;
5586 error (_("Cannot change this setting while the inferior is running."));
5589 non_stop
= non_stop_1
;
5593 show_non_stop (struct ui_file
*file
, int from_tty
,
5594 struct cmd_list_element
*c
, const char *value
)
5596 fprintf_filtered (file
,
5597 _("Controlling the inferior in non-stop mode is %s.\n"),
5602 show_schedule_multiple (struct ui_file
*file
, int from_tty
,
5603 struct cmd_list_element
*c
, const char *value
)
5605 fprintf_filtered (file
, _("\
5606 Resuming the execution of threads of all processes is %s.\n"), value
);
5610 _initialize_infrun (void)
5614 struct cmd_list_element
*c
;
5616 add_info ("signals", signals_info
, _("\
5617 What debugger does when program gets various signals.\n\
5618 Specify a signal as argument to print info on that signal only."));
5619 add_info_alias ("handle", "signals", 0);
5621 add_com ("handle", class_run
, handle_command
, _("\
5622 Specify how to handle a signal.\n\
5623 Args are signals and actions to apply to those signals.\n\
5624 Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\
5625 from 1-15 are allowed for compatibility with old versions of GDB.\n\
5626 Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\
5627 The special arg \"all\" is recognized to mean all signals except those\n\
5628 used by the debugger, typically SIGTRAP and SIGINT.\n\
5629 Recognized actions include \"stop\", \"nostop\", \"print\", \"noprint\",\n\
5630 \"pass\", \"nopass\", \"ignore\", or \"noignore\".\n\
5631 Stop means reenter debugger if this signal happens (implies print).\n\
5632 Print means print a message if this signal happens.\n\
5633 Pass means let program see this signal; otherwise program doesn't know.\n\
5634 Ignore is a synonym for nopass and noignore is a synonym for pass.\n\
5635 Pass and Stop may be combined."));
5638 add_com ("lz", class_info
, signals_info
, _("\
5639 What debugger does when program gets various signals.\n\
5640 Specify a signal as argument to print info on that signal only."));
5641 add_com ("z", class_run
, xdb_handle_command
, _("\
5642 Specify how to handle a signal.\n\
5643 Args are signals and actions to apply to those signals.\n\
5644 Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\
5645 from 1-15 are allowed for compatibility with old versions of GDB.\n\
5646 Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\
5647 The special arg \"all\" is recognized to mean all signals except those\n\
5648 used by the debugger, typically SIGTRAP and SIGINT.\n\
5649 Recognized actions include \"s\" (toggles between stop and nostop), \n\
5650 \"r\" (toggles between print and noprint), \"i\" (toggles between pass and \
5651 nopass), \"Q\" (noprint)\n\
5652 Stop means reenter debugger if this signal happens (implies print).\n\
5653 Print means print a message if this signal happens.\n\
5654 Pass means let program see this signal; otherwise program doesn't know.\n\
5655 Ignore is a synonym for nopass and noignore is a synonym for pass.\n\
5656 Pass and Stop may be combined."));
5660 stop_command
= add_cmd ("stop", class_obscure
,
5661 not_just_help_class_command
, _("\
5662 There is no `stop' command, but you can set a hook on `stop'.\n\
5663 This allows you to set a list of commands to be run each time execution\n\
5664 of the program stops."), &cmdlist
);
5666 add_setshow_zinteger_cmd ("infrun", class_maintenance
, &debug_infrun
, _("\
5667 Set inferior debugging."), _("\
5668 Show inferior debugging."), _("\
5669 When non-zero, inferior specific debugging is enabled."),
5672 &setdebuglist
, &showdebuglist
);
5674 add_setshow_boolean_cmd ("displaced", class_maintenance
, &debug_displaced
, _("\
5675 Set displaced stepping debugging."), _("\
5676 Show displaced stepping debugging."), _("\
5677 When non-zero, displaced stepping specific debugging is enabled."),
5679 show_debug_displaced
,
5680 &setdebuglist
, &showdebuglist
);
5682 add_setshow_boolean_cmd ("non-stop", no_class
,
5684 Set whether gdb controls the inferior in non-stop mode."), _("\
5685 Show whether gdb controls the inferior in non-stop mode."), _("\
5686 When debugging a multi-threaded program and this setting is\n\
5687 off (the default, also called all-stop mode), when one thread stops\n\
5688 (for a breakpoint, watchpoint, exception, or similar events), GDB stops\n\
5689 all other threads in the program while you interact with the thread of\n\
5690 interest. When you continue or step a thread, you can allow the other\n\
5691 threads to run, or have them remain stopped, but while you inspect any\n\
5692 thread's state, all threads stop.\n\
5694 In non-stop mode, when one thread stops, other threads can continue\n\
5695 to run freely. You'll be able to step each thread independently,\n\
5696 leave it stopped or free to run as needed."),
5702 numsigs
= (int) TARGET_SIGNAL_LAST
;
5703 signal_stop
= (unsigned char *) xmalloc (sizeof (signal_stop
[0]) * numsigs
);
5704 signal_print
= (unsigned char *)
5705 xmalloc (sizeof (signal_print
[0]) * numsigs
);
5706 signal_program
= (unsigned char *)
5707 xmalloc (sizeof (signal_program
[0]) * numsigs
);
5708 for (i
= 0; i
< numsigs
; i
++)
5711 signal_print
[i
] = 1;
5712 signal_program
[i
] = 1;
5715 /* Signals caused by debugger's own actions
5716 should not be given to the program afterwards. */
5717 signal_program
[TARGET_SIGNAL_TRAP
] = 0;
5718 signal_program
[TARGET_SIGNAL_INT
] = 0;
5720 /* Signals that are not errors should not normally enter the debugger. */
5721 signal_stop
[TARGET_SIGNAL_ALRM
] = 0;
5722 signal_print
[TARGET_SIGNAL_ALRM
] = 0;
5723 signal_stop
[TARGET_SIGNAL_VTALRM
] = 0;
5724 signal_print
[TARGET_SIGNAL_VTALRM
] = 0;
5725 signal_stop
[TARGET_SIGNAL_PROF
] = 0;
5726 signal_print
[TARGET_SIGNAL_PROF
] = 0;
5727 signal_stop
[TARGET_SIGNAL_CHLD
] = 0;
5728 signal_print
[TARGET_SIGNAL_CHLD
] = 0;
5729 signal_stop
[TARGET_SIGNAL_IO
] = 0;
5730 signal_print
[TARGET_SIGNAL_IO
] = 0;
5731 signal_stop
[TARGET_SIGNAL_POLL
] = 0;
5732 signal_print
[TARGET_SIGNAL_POLL
] = 0;
5733 signal_stop
[TARGET_SIGNAL_URG
] = 0;
5734 signal_print
[TARGET_SIGNAL_URG
] = 0;
5735 signal_stop
[TARGET_SIGNAL_WINCH
] = 0;
5736 signal_print
[TARGET_SIGNAL_WINCH
] = 0;
5738 /* These signals are used internally by user-level thread
5739 implementations. (See signal(5) on Solaris.) Like the above
5740 signals, a healthy program receives and handles them as part of
5741 its normal operation. */
5742 signal_stop
[TARGET_SIGNAL_LWP
] = 0;
5743 signal_print
[TARGET_SIGNAL_LWP
] = 0;
5744 signal_stop
[TARGET_SIGNAL_WAITING
] = 0;
5745 signal_print
[TARGET_SIGNAL_WAITING
] = 0;
5746 signal_stop
[TARGET_SIGNAL_CANCEL
] = 0;
5747 signal_print
[TARGET_SIGNAL_CANCEL
] = 0;
5749 add_setshow_zinteger_cmd ("stop-on-solib-events", class_support
,
5750 &stop_on_solib_events
, _("\
5751 Set stopping for shared library events."), _("\
5752 Show stopping for shared library events."), _("\
5753 If nonzero, gdb will give control to the user when the dynamic linker\n\
5754 notifies gdb of shared library events. The most common event of interest\n\
5755 to the user would be loading/unloading of a new library."),
5757 show_stop_on_solib_events
,
5758 &setlist
, &showlist
);
5760 add_setshow_enum_cmd ("follow-fork-mode", class_run
,
5761 follow_fork_mode_kind_names
,
5762 &follow_fork_mode_string
, _("\
5763 Set debugger response to a program call of fork or vfork."), _("\
5764 Show debugger response to a program call of fork or vfork."), _("\
5765 A fork or vfork creates a new process. follow-fork-mode can be:\n\
5766 parent - the original process is debugged after a fork\n\
5767 child - the new process is debugged after a fork\n\
5768 The unfollowed process will continue to run.\n\
5769 By default, the debugger will follow the parent process."),
5771 show_follow_fork_mode_string
,
5772 &setlist
, &showlist
);
5774 add_setshow_enum_cmd ("scheduler-locking", class_run
,
5775 scheduler_enums
, &scheduler_mode
, _("\
5776 Set mode for locking scheduler during execution."), _("\
5777 Show mode for locking scheduler during execution."), _("\
5778 off == no locking (threads may preempt at any time)\n\
5779 on == full locking (no thread except the current thread may run)\n\
5780 step == scheduler locked during every single-step operation.\n\
5781 In this mode, no other thread may run during a step command.\n\
5782 Other threads may run while stepping over a function call ('next')."),
5783 set_schedlock_func
, /* traps on target vector */
5784 show_scheduler_mode
,
5785 &setlist
, &showlist
);
5787 add_setshow_boolean_cmd ("schedule-multiple", class_run
, &sched_multi
, _("\
5788 Set mode for resuming threads of all processes."), _("\
5789 Show mode for resuming threads of all processes."), _("\
5790 When on, execution commands (such as 'continue' or 'next') resume all\n\
5791 threads of all processes. When off (which is the default), execution\n\
5792 commands only resume the threads of the current process. The set of\n\
5793 threads that are resumed is further refined by the scheduler-locking\n\
5794 mode (see help set scheduler-locking)."),
5796 show_schedule_multiple
,
5797 &setlist
, &showlist
);
5799 add_setshow_boolean_cmd ("step-mode", class_run
, &step_stop_if_no_debug
, _("\
5800 Set mode of the step operation."), _("\
5801 Show mode of the step operation."), _("\
5802 When set, doing a step over a function without debug line information\n\
5803 will stop at the first instruction of that function. Otherwise, the\n\
5804 function is skipped and the step command stops at a different source line."),
5806 show_step_stop_if_no_debug
,
5807 &setlist
, &showlist
);
5809 add_setshow_enum_cmd ("displaced-stepping", class_run
,
5810 can_use_displaced_stepping_enum
,
5811 &can_use_displaced_stepping
, _("\
5812 Set debugger's willingness to use displaced stepping."), _("\
5813 Show debugger's willingness to use displaced stepping."), _("\
5814 If on, gdb will use displaced stepping to step over breakpoints if it is\n\
5815 supported by the target architecture. If off, gdb will not use displaced\n\
5816 stepping to step over breakpoints, even if such is supported by the target\n\
5817 architecture. If auto (which is the default), gdb will use displaced stepping\n\
5818 if the target architecture supports it and non-stop mode is active, but will not\n\
5819 use it in all-stop mode (see help set non-stop)."),
5821 show_can_use_displaced_stepping
,
5822 &setlist
, &showlist
);
5824 add_setshow_enum_cmd ("exec-direction", class_run
, exec_direction_names
,
5825 &exec_direction
, _("Set direction of execution.\n\
5826 Options are 'forward' or 'reverse'."),
5827 _("Show direction of execution (forward/reverse)."),
5828 _("Tells gdb whether to execute forward or backward."),
5829 set_exec_direction_func
, show_exec_direction_func
,
5830 &setlist
, &showlist
);
5832 /* ptid initializations */
5833 null_ptid
= ptid_build (0, 0, 0);
5834 minus_one_ptid
= ptid_build (-1, 0, 0);
5835 inferior_ptid
= null_ptid
;
5836 target_last_wait_ptid
= minus_one_ptid
;
5837 displaced_step_ptid
= null_ptid
;
5839 observer_attach_thread_ptid_changed (infrun_thread_ptid_changed
);
5840 observer_attach_thread_stop_requested (infrun_thread_stop_requested
);
5841 observer_attach_thread_exit (infrun_thread_thread_exit
);
5843 /* Explicitly create without lookup, since that tries to create a
5844 value with a void typed value, and when we get here, gdbarch
5845 isn't initialized yet. At this point, we're quite sure there
5846 isn't another convenience variable of the same name. */
5847 create_internalvar_type_lazy ("_siginfo", siginfo_make_value
);