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 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"
49 #include "gdb_assert.h"
50 #include "mi/mi-common.h"
51 #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 void xdb_handle_command (char *args
, int from_tty
);
80 static int prepare_to_proceed (int);
82 void _initialize_infrun (void);
84 /* When set, stop the 'step' command if we enter a function which has
85 no line number information. The normal behavior is that we step
86 over such function. */
87 int step_stop_if_no_debug
= 0;
89 show_step_stop_if_no_debug (struct ui_file
*file
, int from_tty
,
90 struct cmd_list_element
*c
, const char *value
)
92 fprintf_filtered (file
, _("Mode of the step operation is %s.\n"), value
);
95 /* In asynchronous mode, but simulating synchronous execution. */
97 int sync_execution
= 0;
99 /* wait_for_inferior and normal_stop use this to notify the user
100 when the inferior stopped in a different thread than it had been
103 static ptid_t previous_inferior_ptid
;
105 int debug_displaced
= 0;
107 show_debug_displaced (struct ui_file
*file
, int from_tty
,
108 struct cmd_list_element
*c
, const char *value
)
110 fprintf_filtered (file
, _("Displace stepping debugging is %s.\n"), value
);
113 static int debug_infrun
= 0;
115 show_debug_infrun (struct ui_file
*file
, int from_tty
,
116 struct cmd_list_element
*c
, const char *value
)
118 fprintf_filtered (file
, _("Inferior debugging is %s.\n"), value
);
121 /* If the program uses ELF-style shared libraries, then calls to
122 functions in shared libraries go through stubs, which live in a
123 table called the PLT (Procedure Linkage Table). The first time the
124 function is called, the stub sends control to the dynamic linker,
125 which looks up the function's real address, patches the stub so
126 that future calls will go directly to the function, and then passes
127 control to the function.
129 If we are stepping at the source level, we don't want to see any of
130 this --- we just want to skip over the stub and the dynamic linker.
131 The simple approach is to single-step until control leaves the
134 However, on some systems (e.g., Red Hat's 5.2 distribution) the
135 dynamic linker calls functions in the shared C library, so you
136 can't tell from the PC alone whether the dynamic linker is still
137 running. In this case, we use a step-resume breakpoint to get us
138 past the dynamic linker, as if we were using "next" to step over a
141 in_solib_dynsym_resolve_code() says whether we're in the dynamic
142 linker code or not. Normally, this means we single-step. However,
143 if SKIP_SOLIB_RESOLVER then returns non-zero, then its value is an
144 address where we can place a step-resume breakpoint to get past the
145 linker's symbol resolution function.
147 in_solib_dynsym_resolve_code() can generally be implemented in a
148 pretty portable way, by comparing the PC against the address ranges
149 of the dynamic linker's sections.
151 SKIP_SOLIB_RESOLVER is generally going to be system-specific, since
152 it depends on internal details of the dynamic linker. It's usually
153 not too hard to figure out where to put a breakpoint, but it
154 certainly isn't portable. SKIP_SOLIB_RESOLVER should do plenty of
155 sanity checking. If it can't figure things out, returning zero and
156 getting the (possibly confusing) stepping behavior is better than
157 signalling an error, which will obscure the change in the
160 /* This function returns TRUE if pc is the address of an instruction
161 that lies within the dynamic linker (such as the event hook, or the
164 This function must be used only when a dynamic linker event has
165 been caught, and the inferior is being stepped out of the hook, or
166 undefined results are guaranteed. */
168 #ifndef SOLIB_IN_DYNAMIC_LINKER
169 #define SOLIB_IN_DYNAMIC_LINKER(pid,pc) 0
173 /* Convert the #defines into values. This is temporary until wfi control
174 flow is completely sorted out. */
176 #ifndef CANNOT_STEP_HW_WATCHPOINTS
177 #define CANNOT_STEP_HW_WATCHPOINTS 0
179 #undef CANNOT_STEP_HW_WATCHPOINTS
180 #define CANNOT_STEP_HW_WATCHPOINTS 1
183 /* Tables of how to react to signals; the user sets them. */
185 static unsigned char *signal_stop
;
186 static unsigned char *signal_print
;
187 static unsigned char *signal_program
;
189 #define SET_SIGS(nsigs,sigs,flags) \
191 int signum = (nsigs); \
192 while (signum-- > 0) \
193 if ((sigs)[signum]) \
194 (flags)[signum] = 1; \
197 #define UNSET_SIGS(nsigs,sigs,flags) \
199 int signum = (nsigs); \
200 while (signum-- > 0) \
201 if ((sigs)[signum]) \
202 (flags)[signum] = 0; \
205 /* Value to pass to target_resume() to cause all threads to resume */
207 #define RESUME_ALL (pid_to_ptid (-1))
209 /* Command list pointer for the "stop" placeholder. */
211 static struct cmd_list_element
*stop_command
;
213 /* Function inferior was in as of last step command. */
215 static struct symbol
*step_start_function
;
217 /* Nonzero if we want to give control to the user when we're notified
218 of shared library events by the dynamic linker. */
219 static int stop_on_solib_events
;
221 show_stop_on_solib_events (struct ui_file
*file
, int from_tty
,
222 struct cmd_list_element
*c
, const char *value
)
224 fprintf_filtered (file
, _("Stopping for shared library events is %s.\n"),
228 /* Nonzero means expecting a trace trap
229 and should stop the inferior and return silently when it happens. */
233 /* Save register contents here when about to pop a stack dummy frame,
234 if-and-only-if proceed_to_finish is set.
235 Thus this contains the return value from the called function (assuming
236 values are returned in a register). */
238 struct regcache
*stop_registers
;
240 /* Nonzero after stop if current stack frame should be printed. */
242 static int stop_print_frame
;
244 /* This is a cached copy of the pid/waitstatus of the last event
245 returned by target_wait()/deprecated_target_wait_hook(). This
246 information is returned by get_last_target_status(). */
247 static ptid_t target_last_wait_ptid
;
248 static struct target_waitstatus target_last_waitstatus
;
250 static void context_switch (ptid_t ptid
);
252 void init_thread_stepping_state (struct thread_info
*tss
);
254 void init_infwait_state (void);
256 /* This is used to remember when a fork, vfork or exec event
257 was caught by a catchpoint, and thus the event is to be
258 followed at the next resume of the inferior, and not
262 enum target_waitkind kind
;
269 char *execd_pathname
;
273 static const char follow_fork_mode_child
[] = "child";
274 static const char follow_fork_mode_parent
[] = "parent";
276 static const char *follow_fork_mode_kind_names
[] = {
277 follow_fork_mode_child
,
278 follow_fork_mode_parent
,
282 static const char *follow_fork_mode_string
= follow_fork_mode_parent
;
284 show_follow_fork_mode_string (struct ui_file
*file
, int from_tty
,
285 struct cmd_list_element
*c
, const char *value
)
287 fprintf_filtered (file
, _("\
288 Debugger response to a program call of fork or vfork is \"%s\".\n"),
296 int follow_child
= (follow_fork_mode_string
== follow_fork_mode_child
);
298 return target_follow_fork (follow_child
);
302 follow_inferior_reset_breakpoints (void)
304 struct thread_info
*tp
= inferior_thread ();
306 /* Was there a step_resume breakpoint? (There was if the user
307 did a "next" at the fork() call.) If so, explicitly reset its
310 step_resumes are a form of bp that are made to be per-thread.
311 Since we created the step_resume bp when the parent process
312 was being debugged, and now are switching to the child process,
313 from the breakpoint package's viewpoint, that's a switch of
314 "threads". We must update the bp's notion of which thread
315 it is for, or it'll be ignored when it triggers. */
317 if (tp
->step_resume_breakpoint
)
318 breakpoint_re_set_thread (tp
->step_resume_breakpoint
);
320 /* Reinsert all breakpoints in the child. The user may have set
321 breakpoints after catching the fork, in which case those
322 were never set in the child, but only in the parent. This makes
323 sure the inserted breakpoints match the breakpoint list. */
325 breakpoint_re_set ();
326 insert_breakpoints ();
329 /* EXECD_PATHNAME is assumed to be non-NULL. */
332 follow_exec (ptid_t pid
, char *execd_pathname
)
334 struct target_ops
*tgt
;
335 struct thread_info
*th
= inferior_thread ();
337 /* This is an exec event that we actually wish to pay attention to.
338 Refresh our symbol table to the newly exec'd program, remove any
341 If there are breakpoints, they aren't really inserted now,
342 since the exec() transformed our inferior into a fresh set
345 We want to preserve symbolic breakpoints on the list, since
346 we have hopes that they can be reset after the new a.out's
347 symbol table is read.
349 However, any "raw" breakpoints must be removed from the list
350 (e.g., the solib bp's), since their address is probably invalid
353 And, we DON'T want to call delete_breakpoints() here, since
354 that may write the bp's "shadow contents" (the instruction
355 value that was overwritten witha TRAP instruction). Since
356 we now have a new a.out, those shadow contents aren't valid. */
357 update_breakpoints_after_exec ();
359 /* If there was one, it's gone now. We cannot truly step-to-next
360 statement through an exec(). */
361 th
->step_resume_breakpoint
= NULL
;
362 th
->step_range_start
= 0;
363 th
->step_range_end
= 0;
365 /* What is this a.out's name? */
366 printf_unfiltered (_("Executing new program: %s\n"), execd_pathname
);
368 /* We've followed the inferior through an exec. Therefore, the
369 inferior has essentially been killed & reborn. */
371 gdb_flush (gdb_stdout
);
373 breakpoint_init_inferior (inf_execd
);
375 if (gdb_sysroot
&& *gdb_sysroot
)
377 char *name
= alloca (strlen (gdb_sysroot
)
378 + strlen (execd_pathname
)
380 strcpy (name
, gdb_sysroot
);
381 strcat (name
, execd_pathname
);
382 execd_pathname
= name
;
385 /* That a.out is now the one to use. */
386 exec_file_attach (execd_pathname
, 0);
388 /* Reset the shared library package. This ensures that we get a
389 shlib event when the child reaches "_start", at which point the
390 dld will have had a chance to initialize the child. */
391 /* Also, loading a symbol file below may trigger symbol lookups, and
392 we don't want those to be satisfied by the libraries of the
393 previous incarnation of this process. */
394 no_shared_libraries (NULL
, 0);
396 /* Load the main file's symbols. */
397 symbol_file_add_main (execd_pathname
, 0);
399 #ifdef SOLIB_CREATE_INFERIOR_HOOK
400 SOLIB_CREATE_INFERIOR_HOOK (PIDGET (inferior_ptid
));
402 solib_create_inferior_hook ();
405 /* Reinsert all breakpoints. (Those which were symbolic have
406 been reset to the proper address in the new a.out, thanks
407 to symbol_file_command...) */
408 insert_breakpoints ();
410 /* The next resume of this inferior should bring it to the shlib
411 startup breakpoints. (If the user had also set bp's on
412 "main" from the old (parent) process, then they'll auto-
413 matically get reset there in the new process.) */
416 /* Non-zero if we just simulating a single-step. This is needed
417 because we cannot remove the breakpoints in the inferior process
418 until after the `wait' in `wait_for_inferior'. */
419 static int singlestep_breakpoints_inserted_p
= 0;
421 /* The thread we inserted single-step breakpoints for. */
422 static ptid_t singlestep_ptid
;
424 /* PC when we started this single-step. */
425 static CORE_ADDR singlestep_pc
;
427 /* If another thread hit the singlestep breakpoint, we save the original
428 thread here so that we can resume single-stepping it later. */
429 static ptid_t saved_singlestep_ptid
;
430 static int stepping_past_singlestep_breakpoint
;
432 /* If not equal to null_ptid, this means that after stepping over breakpoint
433 is finished, we need to switch to deferred_step_ptid, and step it.
435 The use case is when one thread has hit a breakpoint, and then the user
436 has switched to another thread and issued 'step'. We need to step over
437 breakpoint in the thread which hit the breakpoint, but then continue
438 stepping the thread user has selected. */
439 static ptid_t deferred_step_ptid
;
441 /* Displaced stepping. */
443 /* In non-stop debugging mode, we must take special care to manage
444 breakpoints properly; in particular, the traditional strategy for
445 stepping a thread past a breakpoint it has hit is unsuitable.
446 'Displaced stepping' is a tactic for stepping one thread past a
447 breakpoint it has hit while ensuring that other threads running
448 concurrently will hit the breakpoint as they should.
450 The traditional way to step a thread T off a breakpoint in a
451 multi-threaded program in all-stop mode is as follows:
453 a0) Initially, all threads are stopped, and breakpoints are not
455 a1) We single-step T, leaving breakpoints uninserted.
456 a2) We insert breakpoints, and resume all threads.
458 In non-stop debugging, however, this strategy is unsuitable: we
459 don't want to have to stop all threads in the system in order to
460 continue or step T past a breakpoint. Instead, we use displaced
463 n0) Initially, T is stopped, other threads are running, and
464 breakpoints are inserted.
465 n1) We copy the instruction "under" the breakpoint to a separate
466 location, outside the main code stream, making any adjustments
467 to the instruction, register, and memory state as directed by
469 n2) We single-step T over the instruction at its new location.
470 n3) We adjust the resulting register and memory state as directed
471 by T's architecture. This includes resetting T's PC to point
472 back into the main instruction stream.
475 This approach depends on the following gdbarch methods:
477 - gdbarch_max_insn_length and gdbarch_displaced_step_location
478 indicate where to copy the instruction, and how much space must
479 be reserved there. We use these in step n1.
481 - gdbarch_displaced_step_copy_insn copies a instruction to a new
482 address, and makes any necessary adjustments to the instruction,
483 register contents, and memory. We use this in step n1.
485 - gdbarch_displaced_step_fixup adjusts registers and memory after
486 we have successfuly single-stepped the instruction, to yield the
487 same effect the instruction would have had if we had executed it
488 at its original address. We use this in step n3.
490 - gdbarch_displaced_step_free_closure provides cleanup.
492 The gdbarch_displaced_step_copy_insn and
493 gdbarch_displaced_step_fixup functions must be written so that
494 copying an instruction with gdbarch_displaced_step_copy_insn,
495 single-stepping across the copied instruction, and then applying
496 gdbarch_displaced_insn_fixup should have the same effects on the
497 thread's memory and registers as stepping the instruction in place
498 would have. Exactly which responsibilities fall to the copy and
499 which fall to the fixup is up to the author of those functions.
501 See the comments in gdbarch.sh for details.
503 Note that displaced stepping and software single-step cannot
504 currently be used in combination, although with some care I think
505 they could be made to. Software single-step works by placing
506 breakpoints on all possible subsequent instructions; if the
507 displaced instruction is a PC-relative jump, those breakpoints
508 could fall in very strange places --- on pages that aren't
509 executable, or at addresses that are not proper instruction
510 boundaries. (We do generally let other threads run while we wait
511 to hit the software single-step breakpoint, and they might
512 encounter such a corrupted instruction.) One way to work around
513 this would be to have gdbarch_displaced_step_copy_insn fully
514 simulate the effect of PC-relative instructions (and return NULL)
515 on architectures that use software single-stepping.
517 In non-stop mode, we can have independent and simultaneous step
518 requests, so more than one thread may need to simultaneously step
519 over a breakpoint. The current implementation assumes there is
520 only one scratch space per process. In this case, we have to
521 serialize access to the scratch space. If thread A wants to step
522 over a breakpoint, but we are currently waiting for some other
523 thread to complete a displaced step, we leave thread A stopped and
524 place it in the displaced_step_request_queue. Whenever a displaced
525 step finishes, we pick the next thread in the queue and start a new
526 displaced step operation on it. See displaced_step_prepare and
527 displaced_step_fixup for details. */
529 /* If this is not null_ptid, this is the thread carrying out a
530 displaced single-step. This thread's state will require fixing up
531 once it has completed its step. */
532 static ptid_t displaced_step_ptid
;
534 struct displaced_step_request
537 struct displaced_step_request
*next
;
540 /* A queue of pending displaced stepping requests. */
541 struct displaced_step_request
*displaced_step_request_queue
;
543 /* The architecture the thread had when we stepped it. */
544 static struct gdbarch
*displaced_step_gdbarch
;
546 /* The closure provided gdbarch_displaced_step_copy_insn, to be used
547 for post-step cleanup. */
548 static struct displaced_step_closure
*displaced_step_closure
;
550 /* The address of the original instruction, and the copy we made. */
551 static CORE_ADDR displaced_step_original
, displaced_step_copy
;
553 /* Saved contents of copy area. */
554 static gdb_byte
*displaced_step_saved_copy
;
556 /* When this is non-zero, we are allowed to use displaced stepping, if
557 the architecture supports it. When this is zero, we use
558 traditional the hold-and-step approach. */
559 int can_use_displaced_stepping
= 1;
561 show_can_use_displaced_stepping (struct ui_file
*file
, int from_tty
,
562 struct cmd_list_element
*c
,
565 fprintf_filtered (file
, _("\
566 Debugger's willingness to use displaced stepping to step over "
567 "breakpoints is %s.\n"), value
);
570 /* Return non-zero if displaced stepping is enabled, and can be used
573 use_displaced_stepping (struct gdbarch
*gdbarch
)
575 return (can_use_displaced_stepping
576 && gdbarch_displaced_step_copy_insn_p (gdbarch
));
579 /* Clean out any stray displaced stepping state. */
581 displaced_step_clear (void)
583 /* Indicate that there is no cleanup pending. */
584 displaced_step_ptid
= null_ptid
;
586 if (displaced_step_closure
)
588 gdbarch_displaced_step_free_closure (displaced_step_gdbarch
,
589 displaced_step_closure
);
590 displaced_step_closure
= NULL
;
595 cleanup_displaced_step_closure (void *ptr
)
597 struct displaced_step_closure
*closure
= ptr
;
599 gdbarch_displaced_step_free_closure (current_gdbarch
, closure
);
602 /* Dump LEN bytes at BUF in hex to FILE, followed by a newline. */
604 displaced_step_dump_bytes (struct ui_file
*file
,
610 for (i
= 0; i
< len
; i
++)
611 fprintf_unfiltered (file
, "%02x ", buf
[i
]);
612 fputs_unfiltered ("\n", file
);
615 /* Prepare to single-step, using displaced stepping.
617 Note that we cannot use displaced stepping when we have a signal to
618 deliver. If we have a signal to deliver and an instruction to step
619 over, then after the step, there will be no indication from the
620 target whether the thread entered a signal handler or ignored the
621 signal and stepped over the instruction successfully --- both cases
622 result in a simple SIGTRAP. In the first case we mustn't do a
623 fixup, and in the second case we must --- but we can't tell which.
624 Comments in the code for 'random signals' in handle_inferior_event
625 explain how we handle this case instead.
627 Returns 1 if preparing was successful -- this thread is going to be
628 stepped now; or 0 if displaced stepping this thread got queued. */
630 displaced_step_prepare (ptid_t ptid
)
632 struct cleanup
*old_cleanups
, *ignore_cleanups
;
633 struct regcache
*regcache
= get_thread_regcache (ptid
);
634 struct gdbarch
*gdbarch
= get_regcache_arch (regcache
);
635 CORE_ADDR original
, copy
;
637 struct displaced_step_closure
*closure
;
639 /* We should never reach this function if the architecture does not
640 support displaced stepping. */
641 gdb_assert (gdbarch_displaced_step_copy_insn_p (gdbarch
));
643 /* For the first cut, we're displaced stepping one thread at a
646 if (!ptid_equal (displaced_step_ptid
, null_ptid
))
648 /* Already waiting for a displaced step to finish. Defer this
649 request and place in queue. */
650 struct displaced_step_request
*req
, *new_req
;
653 fprintf_unfiltered (gdb_stdlog
,
654 "displaced: defering step of %s\n",
655 target_pid_to_str (ptid
));
657 new_req
= xmalloc (sizeof (*new_req
));
658 new_req
->ptid
= ptid
;
659 new_req
->next
= NULL
;
661 if (displaced_step_request_queue
)
663 for (req
= displaced_step_request_queue
;
670 displaced_step_request_queue
= new_req
;
677 fprintf_unfiltered (gdb_stdlog
,
678 "displaced: stepping %s now\n",
679 target_pid_to_str (ptid
));
682 displaced_step_clear ();
684 old_cleanups
= save_inferior_ptid ();
685 inferior_ptid
= ptid
;
687 original
= regcache_read_pc (regcache
);
689 copy
= gdbarch_displaced_step_location (gdbarch
);
690 len
= gdbarch_max_insn_length (gdbarch
);
692 /* Save the original contents of the copy area. */
693 displaced_step_saved_copy
= xmalloc (len
);
694 ignore_cleanups
= make_cleanup (free_current_contents
,
695 &displaced_step_saved_copy
);
696 read_memory (copy
, displaced_step_saved_copy
, len
);
699 fprintf_unfiltered (gdb_stdlog
, "displaced: saved 0x%s: ",
701 displaced_step_dump_bytes (gdb_stdlog
, displaced_step_saved_copy
, len
);
704 closure
= gdbarch_displaced_step_copy_insn (gdbarch
,
705 original
, copy
, regcache
);
707 /* We don't support the fully-simulated case at present. */
708 gdb_assert (closure
);
710 make_cleanup (cleanup_displaced_step_closure
, closure
);
712 /* Resume execution at the copy. */
713 regcache_write_pc (regcache
, copy
);
715 discard_cleanups (ignore_cleanups
);
717 do_cleanups (old_cleanups
);
720 fprintf_unfiltered (gdb_stdlog
, "displaced: displaced pc to 0x%s\n",
723 /* Save the information we need to fix things up if the step
725 displaced_step_ptid
= ptid
;
726 displaced_step_gdbarch
= gdbarch
;
727 displaced_step_closure
= closure
;
728 displaced_step_original
= original
;
729 displaced_step_copy
= copy
;
734 displaced_step_clear_cleanup (void *ignore
)
736 displaced_step_clear ();
740 write_memory_ptid (ptid_t ptid
, CORE_ADDR memaddr
, const gdb_byte
*myaddr
, int len
)
742 struct cleanup
*ptid_cleanup
= save_inferior_ptid ();
743 inferior_ptid
= ptid
;
744 write_memory (memaddr
, myaddr
, len
);
745 do_cleanups (ptid_cleanup
);
749 displaced_step_fixup (ptid_t event_ptid
, enum target_signal signal
)
751 struct cleanup
*old_cleanups
;
753 /* Was this event for the pid we displaced? */
754 if (ptid_equal (displaced_step_ptid
, null_ptid
)
755 || ! ptid_equal (displaced_step_ptid
, event_ptid
))
758 old_cleanups
= make_cleanup (displaced_step_clear_cleanup
, 0);
760 /* Restore the contents of the copy area. */
762 ULONGEST len
= gdbarch_max_insn_length (displaced_step_gdbarch
);
763 write_memory_ptid (displaced_step_ptid
, displaced_step_copy
,
764 displaced_step_saved_copy
, len
);
766 fprintf_unfiltered (gdb_stdlog
, "displaced: restored 0x%s\n",
767 paddr_nz (displaced_step_copy
));
770 /* Did the instruction complete successfully? */
771 if (signal
== TARGET_SIGNAL_TRAP
)
773 /* Fix up the resulting state. */
774 gdbarch_displaced_step_fixup (displaced_step_gdbarch
,
775 displaced_step_closure
,
776 displaced_step_original
,
778 get_thread_regcache (displaced_step_ptid
));
782 /* Since the instruction didn't complete, all we can do is
784 struct regcache
*regcache
= get_thread_regcache (event_ptid
);
785 CORE_ADDR pc
= regcache_read_pc (regcache
);
786 pc
= displaced_step_original
+ (pc
- displaced_step_copy
);
787 regcache_write_pc (regcache
, pc
);
790 do_cleanups (old_cleanups
);
792 displaced_step_ptid
= null_ptid
;
794 /* Are there any pending displaced stepping requests? If so, run
796 while (displaced_step_request_queue
)
798 struct displaced_step_request
*head
;
802 head
= displaced_step_request_queue
;
804 displaced_step_request_queue
= head
->next
;
807 context_switch (ptid
);
809 actual_pc
= read_pc ();
811 if (breakpoint_here_p (actual_pc
))
814 fprintf_unfiltered (gdb_stdlog
,
815 "displaced: stepping queued %s now\n",
816 target_pid_to_str (ptid
));
818 displaced_step_prepare (ptid
);
824 fprintf_unfiltered (gdb_stdlog
, "displaced: run 0x%s: ",
825 paddr_nz (actual_pc
));
826 read_memory (actual_pc
, buf
, sizeof (buf
));
827 displaced_step_dump_bytes (gdb_stdlog
, buf
, sizeof (buf
));
830 target_resume (ptid
, 1, TARGET_SIGNAL_0
);
832 /* Done, we're stepping a thread. */
838 struct thread_info
*tp
= inferior_thread ();
840 /* The breakpoint we were sitting under has since been
842 tp
->trap_expected
= 0;
844 /* Go back to what we were trying to do. */
845 step
= currently_stepping (tp
);
848 fprintf_unfiltered (gdb_stdlog
, "breakpoint is gone %s: step(%d)\n",
849 target_pid_to_str (tp
->ptid
), step
);
851 target_resume (ptid
, step
, TARGET_SIGNAL_0
);
852 tp
->stop_signal
= TARGET_SIGNAL_0
;
854 /* This request was discarded. See if there's any other
855 thread waiting for its turn. */
860 /* Update global variables holding ptids to hold NEW_PTID if they were
863 infrun_thread_ptid_changed (ptid_t old_ptid
, ptid_t new_ptid
)
865 struct displaced_step_request
*it
;
867 if (ptid_equal (inferior_ptid
, old_ptid
))
868 inferior_ptid
= new_ptid
;
870 if (ptid_equal (singlestep_ptid
, old_ptid
))
871 singlestep_ptid
= new_ptid
;
873 if (ptid_equal (displaced_step_ptid
, old_ptid
))
874 displaced_step_ptid
= new_ptid
;
876 if (ptid_equal (deferred_step_ptid
, old_ptid
))
877 deferred_step_ptid
= new_ptid
;
879 for (it
= displaced_step_request_queue
; it
; it
= it
->next
)
880 if (ptid_equal (it
->ptid
, old_ptid
))
887 /* Things to clean up if we QUIT out of resume (). */
889 resume_cleanups (void *ignore
)
894 static const char schedlock_off
[] = "off";
895 static const char schedlock_on
[] = "on";
896 static const char schedlock_step
[] = "step";
897 static const char *scheduler_enums
[] = {
903 static const char *scheduler_mode
= schedlock_off
;
905 show_scheduler_mode (struct ui_file
*file
, int from_tty
,
906 struct cmd_list_element
*c
, const char *value
)
908 fprintf_filtered (file
, _("\
909 Mode for locking scheduler during execution is \"%s\".\n"),
914 set_schedlock_func (char *args
, int from_tty
, struct cmd_list_element
*c
)
916 if (!target_can_lock_scheduler
)
918 scheduler_mode
= schedlock_off
;
919 error (_("Target '%s' cannot support this command."), target_shortname
);
924 /* Resume the inferior, but allow a QUIT. This is useful if the user
925 wants to interrupt some lengthy single-stepping operation
926 (for child processes, the SIGINT goes to the inferior, and so
927 we get a SIGINT random_signal, but for remote debugging and perhaps
928 other targets, that's not true).
930 STEP nonzero if we should step (zero to continue instead).
931 SIG is the signal to give the inferior (zero for none). */
933 resume (int step
, enum target_signal sig
)
935 int should_resume
= 1;
936 struct cleanup
*old_cleanups
= make_cleanup (resume_cleanups
, 0);
937 struct regcache
*regcache
= get_current_regcache ();
938 struct gdbarch
*gdbarch
= get_regcache_arch (regcache
);
939 struct thread_info
*tp
= inferior_thread ();
940 CORE_ADDR pc
= regcache_read_pc (regcache
);
944 fprintf_unfiltered (gdb_stdlog
,
945 "infrun: resume (step=%d, signal=%d), "
946 "trap_expected=%d\n",
947 step
, sig
, tp
->trap_expected
);
949 /* Some targets (e.g. Solaris x86) have a kernel bug when stepping
950 over an instruction that causes a page fault without triggering
951 a hardware watchpoint. The kernel properly notices that it shouldn't
952 stop, because the hardware watchpoint is not triggered, but it forgets
953 the step request and continues the program normally.
954 Work around the problem by removing hardware watchpoints if a step is
955 requested, GDB will check for a hardware watchpoint trigger after the
957 if (CANNOT_STEP_HW_WATCHPOINTS
&& step
)
958 remove_hw_watchpoints ();
961 /* Normally, by the time we reach `resume', the breakpoints are either
962 removed or inserted, as appropriate. The exception is if we're sitting
963 at a permanent breakpoint; we need to step over it, but permanent
964 breakpoints can't be removed. So we have to test for it here. */
965 if (breakpoint_here_p (pc
) == permanent_breakpoint_here
)
967 if (gdbarch_skip_permanent_breakpoint_p (gdbarch
))
968 gdbarch_skip_permanent_breakpoint (gdbarch
, regcache
);
971 The program is stopped at a permanent breakpoint, but GDB does not know\n\
972 how to step past a permanent breakpoint on this architecture. Try using\n\
973 a command like `return' or `jump' to continue execution."));
976 /* If enabled, step over breakpoints by executing a copy of the
977 instruction at a different address.
979 We can't use displaced stepping when we have a signal to deliver;
980 the comments for displaced_step_prepare explain why. The
981 comments in the handle_inferior event for dealing with 'random
982 signals' explain what we do instead. */
983 if (use_displaced_stepping (gdbarch
)
985 && sig
== TARGET_SIGNAL_0
)
987 if (!displaced_step_prepare (inferior_ptid
))
989 /* Got placed in displaced stepping queue. Will be resumed
990 later when all the currently queued displaced stepping
991 requests finish. The thread is not executing at this point,
992 and the call to set_executing will be made later. But we
993 need to call set_running here, since from frontend point of view,
994 the thread is running. */
995 set_running (inferior_ptid
, 1);
996 discard_cleanups (old_cleanups
);
1001 if (step
&& gdbarch_software_single_step_p (gdbarch
))
1003 /* Do it the hard way, w/temp breakpoints */
1004 if (gdbarch_software_single_step (gdbarch
, get_current_frame ()))
1006 /* ...and don't ask hardware to do it. */
1008 /* and do not pull these breakpoints until after a `wait' in
1009 `wait_for_inferior' */
1010 singlestep_breakpoints_inserted_p
= 1;
1011 singlestep_ptid
= inferior_ptid
;
1016 /* If there were any forks/vforks/execs that were caught and are
1017 now to be followed, then do so. */
1018 switch (pending_follow
.kind
)
1020 case TARGET_WAITKIND_FORKED
:
1021 case TARGET_WAITKIND_VFORKED
:
1022 pending_follow
.kind
= TARGET_WAITKIND_SPURIOUS
;
1027 case TARGET_WAITKIND_EXECD
:
1028 /* follow_exec is called as soon as the exec event is seen. */
1029 pending_follow
.kind
= TARGET_WAITKIND_SPURIOUS
;
1036 /* Install inferior's terminal modes. */
1037 target_terminal_inferior ();
1043 resume_ptid
= RESUME_ALL
; /* Default */
1045 /* If STEP is set, it's a request to use hardware stepping
1046 facilities. But in that case, we should never
1047 use singlestep breakpoint. */
1048 gdb_assert (!(singlestep_breakpoints_inserted_p
&& step
));
1050 if (singlestep_breakpoints_inserted_p
1051 && stepping_past_singlestep_breakpoint
)
1053 /* The situation here is as follows. In thread T1 we wanted to
1054 single-step. Lacking hardware single-stepping we've
1055 set breakpoint at the PC of the next instruction -- call it
1056 P. After resuming, we've hit that breakpoint in thread T2.
1057 Now we've removed original breakpoint, inserted breakpoint
1058 at P+1, and try to step to advance T2 past breakpoint.
1059 We need to step only T2, as if T1 is allowed to freely run,
1060 it can run past P, and if other threads are allowed to run,
1061 they can hit breakpoint at P+1, and nested hits of single-step
1062 breakpoints is not something we'd want -- that's complicated
1063 to support, and has no value. */
1064 resume_ptid
= inferior_ptid
;
1067 if ((step
|| singlestep_breakpoints_inserted_p
)
1068 && tp
->trap_expected
)
1070 /* We're allowing a thread to run past a breakpoint it has
1071 hit, by single-stepping the thread with the breakpoint
1072 removed. In which case, we need to single-step only this
1073 thread, and keep others stopped, as they can miss this
1074 breakpoint if allowed to run.
1076 The current code actually removes all breakpoints when
1077 doing this, not just the one being stepped over, so if we
1078 let other threads run, we can actually miss any
1079 breakpoint, not just the one at PC. */
1080 resume_ptid
= inferior_ptid
;
1085 /* With non-stop mode on, threads are always handled
1087 resume_ptid
= inferior_ptid
;
1089 else if ((scheduler_mode
== schedlock_on
)
1090 || (scheduler_mode
== schedlock_step
1091 && (step
|| singlestep_breakpoints_inserted_p
)))
1093 /* User-settable 'scheduler' mode requires solo thread resume. */
1094 resume_ptid
= inferior_ptid
;
1097 if (gdbarch_cannot_step_breakpoint (gdbarch
))
1099 /* Most targets can step a breakpoint instruction, thus
1100 executing it normally. But if this one cannot, just
1101 continue and we will hit it anyway. */
1102 if (step
&& breakpoint_inserted_here_p (pc
))
1107 && use_displaced_stepping (gdbarch
)
1108 && tp
->trap_expected
)
1110 struct regcache
*resume_regcache
= get_thread_regcache (resume_ptid
);
1111 CORE_ADDR actual_pc
= regcache_read_pc (resume_regcache
);
1114 fprintf_unfiltered (gdb_stdlog
, "displaced: run 0x%s: ",
1115 paddr_nz (actual_pc
));
1116 read_memory (actual_pc
, buf
, sizeof (buf
));
1117 displaced_step_dump_bytes (gdb_stdlog
, buf
, sizeof (buf
));
1120 target_resume (resume_ptid
, step
, sig
);
1122 /* Avoid confusing the next resume, if the next stop/resume
1123 happens to apply to another thread. */
1124 tp
->stop_signal
= TARGET_SIGNAL_0
;
1127 discard_cleanups (old_cleanups
);
1132 /* Clear out all variables saying what to do when inferior is continued.
1133 First do this, then set the ones you want, then call `proceed'. */
1136 clear_proceed_status (void)
1138 if (!ptid_equal (inferior_ptid
, null_ptid
))
1140 struct thread_info
*tp
;
1141 struct inferior
*inferior
;
1143 tp
= inferior_thread ();
1145 tp
->trap_expected
= 0;
1146 tp
->step_range_start
= 0;
1147 tp
->step_range_end
= 0;
1148 tp
->step_frame_id
= null_frame_id
;
1149 tp
->step_over_calls
= STEP_OVER_UNDEBUGGABLE
;
1153 tp
->proceed_to_finish
= 0;
1155 /* Discard any remaining commands or status from previous
1157 bpstat_clear (&tp
->stop_bpstat
);
1159 inferior
= current_inferior ();
1160 inferior
->stop_soon
= NO_STOP_QUIETLY
;
1163 stop_after_trap
= 0;
1164 breakpoint_proceeded
= 1; /* We're about to proceed... */
1168 regcache_xfree (stop_registers
);
1169 stop_registers
= NULL
;
1173 /* This should be suitable for any targets that support threads. */
1176 prepare_to_proceed (int step
)
1179 struct target_waitstatus wait_status
;
1181 /* Get the last target status returned by target_wait(). */
1182 get_last_target_status (&wait_ptid
, &wait_status
);
1184 /* Make sure we were stopped at a breakpoint. */
1185 if (wait_status
.kind
!= TARGET_WAITKIND_STOPPED
1186 || wait_status
.value
.sig
!= TARGET_SIGNAL_TRAP
)
1191 /* Switched over from WAIT_PID. */
1192 if (!ptid_equal (wait_ptid
, minus_one_ptid
)
1193 && !ptid_equal (inferior_ptid
, wait_ptid
))
1195 struct regcache
*regcache
= get_thread_regcache (wait_ptid
);
1197 if (breakpoint_here_p (regcache_read_pc (regcache
)))
1199 /* If stepping, remember current thread to switch back to. */
1201 deferred_step_ptid
= inferior_ptid
;
1203 /* Switch back to WAIT_PID thread. */
1204 switch_to_thread (wait_ptid
);
1206 /* We return 1 to indicate that there is a breakpoint here,
1207 so we need to step over it before continuing to avoid
1208 hitting it straight away. */
1216 /* Basic routine for continuing the program in various fashions.
1218 ADDR is the address to resume at, or -1 for resume where stopped.
1219 SIGGNAL is the signal to give it, or 0 for none,
1220 or -1 for act according to how it stopped.
1221 STEP is nonzero if should trap after one instruction.
1222 -1 means return after that and print nothing.
1223 You should probably set various step_... variables
1224 before calling here, if you are stepping.
1226 You should call clear_proceed_status before calling proceed. */
1229 proceed (CORE_ADDR addr
, enum target_signal siggnal
, int step
)
1231 struct regcache
*regcache
= get_current_regcache ();
1232 struct gdbarch
*gdbarch
= get_regcache_arch (regcache
);
1233 struct thread_info
*tp
;
1234 CORE_ADDR pc
= regcache_read_pc (regcache
);
1236 enum target_signal stop_signal
;
1239 step_start_function
= find_pc_function (pc
);
1241 stop_after_trap
= 1;
1243 if (addr
== (CORE_ADDR
) -1)
1245 if (pc
== stop_pc
&& breakpoint_here_p (pc
)
1246 && execution_direction
!= EXEC_REVERSE
)
1247 /* There is a breakpoint at the address we will resume at,
1248 step one instruction before inserting breakpoints so that
1249 we do not stop right away (and report a second hit at this
1252 Note, we don't do this in reverse, because we won't
1253 actually be executing the breakpoint insn anyway.
1254 We'll be (un-)executing the previous instruction. */
1257 else if (gdbarch_single_step_through_delay_p (gdbarch
)
1258 && gdbarch_single_step_through_delay (gdbarch
,
1259 get_current_frame ()))
1260 /* We stepped onto an instruction that needs to be stepped
1261 again before re-inserting the breakpoint, do so. */
1266 regcache_write_pc (regcache
, addr
);
1270 fprintf_unfiltered (gdb_stdlog
,
1271 "infrun: proceed (addr=0x%s, signal=%d, step=%d)\n",
1272 paddr_nz (addr
), siggnal
, step
);
1275 /* In non-stop, each thread is handled individually. The context
1276 must already be set to the right thread here. */
1280 /* In a multi-threaded task we may select another thread and
1281 then continue or step.
1283 But if the old thread was stopped at a breakpoint, it will
1284 immediately cause another breakpoint stop without any
1285 execution (i.e. it will report a breakpoint hit incorrectly).
1286 So we must step over it first.
1288 prepare_to_proceed checks the current thread against the
1289 thread that reported the most recent event. If a step-over
1290 is required it returns TRUE and sets the current thread to
1292 if (prepare_to_proceed (step
))
1296 /* prepare_to_proceed may change the current thread. */
1297 tp
= inferior_thread ();
1301 tp
->trap_expected
= 1;
1302 /* If displaced stepping is enabled, we can step over the
1303 breakpoint without hitting it, so leave all breakpoints
1304 inserted. Otherwise we need to disable all breakpoints, step
1305 one instruction, and then re-add them when that step is
1307 if (!use_displaced_stepping (gdbarch
))
1308 remove_breakpoints ();
1311 /* We can insert breakpoints if we're not trying to step over one,
1312 or if we are stepping over one but we're using displaced stepping
1314 if (! tp
->trap_expected
|| use_displaced_stepping (gdbarch
))
1315 insert_breakpoints ();
1319 /* Pass the last stop signal to the thread we're resuming,
1320 irrespective of whether the current thread is the thread that
1321 got the last event or not. This was historically GDB's
1322 behaviour before keeping a stop_signal per thread. */
1324 struct thread_info
*last_thread
;
1326 struct target_waitstatus last_status
;
1328 get_last_target_status (&last_ptid
, &last_status
);
1329 if (!ptid_equal (inferior_ptid
, last_ptid
)
1330 && !ptid_equal (last_ptid
, null_ptid
)
1331 && !ptid_equal (last_ptid
, minus_one_ptid
))
1333 last_thread
= find_thread_pid (last_ptid
);
1336 tp
->stop_signal
= last_thread
->stop_signal
;
1337 last_thread
->stop_signal
= TARGET_SIGNAL_0
;
1342 if (siggnal
!= TARGET_SIGNAL_DEFAULT
)
1343 tp
->stop_signal
= siggnal
;
1344 /* If this signal should not be seen by program,
1345 give it zero. Used for debugging signals. */
1346 else if (!signal_program
[tp
->stop_signal
])
1347 tp
->stop_signal
= TARGET_SIGNAL_0
;
1349 annotate_starting ();
1351 /* Make sure that output from GDB appears before output from the
1353 gdb_flush (gdb_stdout
);
1355 /* Refresh prev_pc value just prior to resuming. This used to be
1356 done in stop_stepping, however, setting prev_pc there did not handle
1357 scenarios such as inferior function calls or returning from
1358 a function via the return command. In those cases, the prev_pc
1359 value was not set properly for subsequent commands. The prev_pc value
1360 is used to initialize the starting line number in the ecs. With an
1361 invalid value, the gdb next command ends up stopping at the position
1362 represented by the next line table entry past our start position.
1363 On platforms that generate one line table entry per line, this
1364 is not a problem. However, on the ia64, the compiler generates
1365 extraneous line table entries that do not increase the line number.
1366 When we issue the gdb next command on the ia64 after an inferior call
1367 or a return command, we often end up a few instructions forward, still
1368 within the original line we started.
1370 An attempt was made to have init_execution_control_state () refresh
1371 the prev_pc value before calculating the line number. This approach
1372 did not work because on platforms that use ptrace, the pc register
1373 cannot be read unless the inferior is stopped. At that point, we
1374 are not guaranteed the inferior is stopped and so the regcache_read_pc ()
1375 call can fail. Setting the prev_pc value here ensures the value is
1376 updated correctly when the inferior is stopped. */
1377 tp
->prev_pc
= regcache_read_pc (get_current_regcache ());
1379 /* Fill in with reasonable starting values. */
1380 init_thread_stepping_state (tp
);
1382 /* Reset to normal state. */
1383 init_infwait_state ();
1385 /* Resume inferior. */
1386 resume (oneproc
|| step
|| bpstat_should_step (), tp
->stop_signal
);
1388 /* Wait for it to stop (if not standalone)
1389 and in any case decode why it stopped, and act accordingly. */
1390 /* Do this only if we are not using the event loop, or if the target
1391 does not support asynchronous execution. */
1392 if (!target_can_async_p ())
1394 wait_for_inferior (0);
1400 /* Start remote-debugging of a machine over a serial link. */
1403 start_remote (int from_tty
)
1405 struct inferior
*inferior
;
1406 init_wait_for_inferior ();
1408 inferior
= current_inferior ();
1409 inferior
->stop_soon
= STOP_QUIETLY_REMOTE
;
1411 /* Always go on waiting for the target, regardless of the mode. */
1412 /* FIXME: cagney/1999-09-23: At present it isn't possible to
1413 indicate to wait_for_inferior that a target should timeout if
1414 nothing is returned (instead of just blocking). Because of this,
1415 targets expecting an immediate response need to, internally, set
1416 things up so that the target_wait() is forced to eventually
1418 /* FIXME: cagney/1999-09-24: It isn't possible for target_open() to
1419 differentiate to its caller what the state of the target is after
1420 the initial open has been performed. Here we're assuming that
1421 the target has stopped. It should be possible to eventually have
1422 target_open() return to the caller an indication that the target
1423 is currently running and GDB state should be set to the same as
1424 for an async run. */
1425 wait_for_inferior (0);
1427 /* Now that the inferior has stopped, do any bookkeeping like
1428 loading shared libraries. We want to do this before normal_stop,
1429 so that the displayed frame is up to date. */
1430 post_create_inferior (¤t_target
, from_tty
);
1435 /* Initialize static vars when a new inferior begins. */
1438 init_wait_for_inferior (void)
1440 /* These are meaningless until the first time through wait_for_inferior. */
1442 breakpoint_init_inferior (inf_starting
);
1444 /* The first resume is not following a fork/vfork/exec. */
1445 pending_follow
.kind
= TARGET_WAITKIND_SPURIOUS
; /* I.e., none. */
1447 clear_proceed_status ();
1449 stepping_past_singlestep_breakpoint
= 0;
1450 deferred_step_ptid
= null_ptid
;
1452 target_last_wait_ptid
= minus_one_ptid
;
1454 previous_inferior_ptid
= null_ptid
;
1455 init_infwait_state ();
1457 displaced_step_clear ();
1461 /* This enum encodes possible reasons for doing a target_wait, so that
1462 wfi can call target_wait in one place. (Ultimately the call will be
1463 moved out of the infinite loop entirely.) */
1467 infwait_normal_state
,
1468 infwait_thread_hop_state
,
1469 infwait_step_watch_state
,
1470 infwait_nonstep_watch_state
1473 /* Why did the inferior stop? Used to print the appropriate messages
1474 to the interface from within handle_inferior_event(). */
1475 enum inferior_stop_reason
1477 /* Step, next, nexti, stepi finished. */
1479 /* Inferior terminated by signal. */
1481 /* Inferior exited. */
1483 /* Inferior received signal, and user asked to be notified. */
1485 /* Reverse execution -- target ran out of history info. */
1489 /* The PTID we'll do a target_wait on.*/
1492 /* Current inferior wait state. */
1493 enum infwait_states infwait_state
;
1495 /* Data to be passed around while handling an event. This data is
1496 discarded between events. */
1497 struct execution_control_state
1500 /* The thread that got the event, if this was a thread event; NULL
1502 struct thread_info
*event_thread
;
1504 struct target_waitstatus ws
;
1506 CORE_ADDR stop_func_start
;
1507 CORE_ADDR stop_func_end
;
1508 char *stop_func_name
;
1509 int new_thread_event
;
1513 void init_execution_control_state (struct execution_control_state
*ecs
);
1515 void handle_inferior_event (struct execution_control_state
*ecs
);
1517 static void handle_step_into_function (struct execution_control_state
*ecs
);
1518 static void handle_step_into_function_backward (struct execution_control_state
*ecs
);
1519 static void insert_step_resume_breakpoint_at_frame (struct frame_info
*step_frame
);
1520 static void insert_step_resume_breakpoint_at_caller (struct frame_info
*);
1521 static void insert_step_resume_breakpoint_at_sal (struct symtab_and_line sr_sal
,
1522 struct frame_id sr_id
);
1523 static void insert_longjmp_resume_breakpoint (CORE_ADDR
);
1525 static void stop_stepping (struct execution_control_state
*ecs
);
1526 static void prepare_to_wait (struct execution_control_state
*ecs
);
1527 static void keep_going (struct execution_control_state
*ecs
);
1528 static void print_stop_reason (enum inferior_stop_reason stop_reason
,
1531 /* Callback for iterate_over_threads. */
1534 delete_step_resume_breakpoint_callback (struct thread_info
*info
, void *data
)
1536 if (is_exited (info
->ptid
))
1539 delete_step_resume_breakpoint (info
);
1543 /* In all-stop, delete the step resume breakpoint of any thread that
1544 had one. In non-stop, delete the step resume breakpoint of the
1545 thread that just stopped. */
1548 delete_step_thread_step_resume_breakpoint (void)
1550 if (!target_has_execution
1551 || ptid_equal (inferior_ptid
, null_ptid
))
1552 /* If the inferior has exited, we have already deleted the step
1553 resume breakpoints out of GDB's lists. */
1558 /* If in non-stop mode, only delete the step-resume or
1559 longjmp-resume breakpoint of the thread that just stopped
1561 struct thread_info
*tp
= inferior_thread ();
1562 delete_step_resume_breakpoint (tp
);
1565 /* In all-stop mode, delete all step-resume and longjmp-resume
1566 breakpoints of any thread that had them. */
1567 iterate_over_threads (delete_step_resume_breakpoint_callback
, NULL
);
1570 /* A cleanup wrapper. */
1573 delete_step_thread_step_resume_breakpoint_cleanup (void *arg
)
1575 delete_step_thread_step_resume_breakpoint ();
1578 /* Wait for control to return from inferior to debugger.
1580 If TREAT_EXEC_AS_SIGTRAP is non-zero, then handle EXEC signals
1581 as if they were SIGTRAP signals. This can be useful during
1582 the startup sequence on some targets such as HP/UX, where
1583 we receive an EXEC event instead of the expected SIGTRAP.
1585 If inferior gets a signal, we may decide to start it up again
1586 instead of returning. That is why there is a loop in this function.
1587 When this function actually returns it means the inferior
1588 should be left stopped and GDB should read more commands. */
1591 wait_for_inferior (int treat_exec_as_sigtrap
)
1593 struct cleanup
*old_cleanups
;
1594 struct execution_control_state ecss
;
1595 struct execution_control_state
*ecs
;
1599 (gdb_stdlog
, "infrun: wait_for_inferior (treat_exec_as_sigtrap=%d)\n",
1600 treat_exec_as_sigtrap
);
1603 make_cleanup (delete_step_thread_step_resume_breakpoint_cleanup
, NULL
);
1606 memset (ecs
, 0, sizeof (*ecs
));
1608 overlay_cache_invalid
= 1;
1610 /* We'll update this if & when we switch to a new thread. */
1611 previous_inferior_ptid
= inferior_ptid
;
1613 /* We have to invalidate the registers BEFORE calling target_wait
1614 because they can be loaded from the target while in target_wait.
1615 This makes remote debugging a bit more efficient for those
1616 targets that provide critical registers as part of their normal
1617 status mechanism. */
1619 registers_changed ();
1623 if (deprecated_target_wait_hook
)
1624 ecs
->ptid
= deprecated_target_wait_hook (waiton_ptid
, &ecs
->ws
);
1626 ecs
->ptid
= target_wait (waiton_ptid
, &ecs
->ws
);
1628 if (treat_exec_as_sigtrap
&& ecs
->ws
.kind
== TARGET_WAITKIND_EXECD
)
1630 xfree (ecs
->ws
.value
.execd_pathname
);
1631 ecs
->ws
.kind
= TARGET_WAITKIND_STOPPED
;
1632 ecs
->ws
.value
.sig
= TARGET_SIGNAL_TRAP
;
1635 /* Now figure out what to do with the result of the result. */
1636 handle_inferior_event (ecs
);
1638 if (!ecs
->wait_some_more
)
1642 do_cleanups (old_cleanups
);
1645 /* Asynchronous version of wait_for_inferior. It is called by the
1646 event loop whenever a change of state is detected on the file
1647 descriptor corresponding to the target. It can be called more than
1648 once to complete a single execution command. In such cases we need
1649 to keep the state in a global variable ECSS. If it is the last time
1650 that this function is called for a single execution command, then
1651 report to the user that the inferior has stopped, and do the
1652 necessary cleanups. */
1655 fetch_inferior_event (void *client_data
)
1657 struct execution_control_state ecss
;
1658 struct execution_control_state
*ecs
= &ecss
;
1659 struct cleanup
*old_chain
= make_cleanup (null_cleanup
, NULL
);
1660 int was_sync
= sync_execution
;
1662 memset (ecs
, 0, sizeof (*ecs
));
1664 overlay_cache_invalid
= 1;
1666 /* We can only rely on wait_for_more being correct before handling
1667 the event in all-stop, but previous_inferior_ptid isn't used in
1669 if (!ecs
->wait_some_more
)
1670 /* We'll update this if & when we switch to a new thread. */
1671 previous_inferior_ptid
= inferior_ptid
;
1674 /* In non-stop mode, the user/frontend should not notice a thread
1675 switch due to internal events. Make sure we reverse to the
1676 user selected thread and frame after handling the event and
1677 running any breakpoint commands. */
1678 make_cleanup_restore_current_thread ();
1680 /* We have to invalidate the registers BEFORE calling target_wait
1681 because they can be loaded from the target while in target_wait.
1682 This makes remote debugging a bit more efficient for those
1683 targets that provide critical registers as part of their normal
1684 status mechanism. */
1686 registers_changed ();
1688 if (deprecated_target_wait_hook
)
1690 deprecated_target_wait_hook (waiton_ptid
, &ecs
->ws
);
1692 ecs
->ptid
= target_wait (waiton_ptid
, &ecs
->ws
);
1695 && ecs
->ws
.kind
!= TARGET_WAITKIND_IGNORE
1696 && ecs
->ws
.kind
!= TARGET_WAITKIND_EXITED
1697 && ecs
->ws
.kind
!= TARGET_WAITKIND_SIGNALLED
)
1698 /* In non-stop mode, each thread is handled individually. Switch
1699 early, so the global state is set correctly for this
1701 context_switch (ecs
->ptid
);
1703 /* Now figure out what to do with the result of the result. */
1704 handle_inferior_event (ecs
);
1706 if (!ecs
->wait_some_more
)
1708 struct inferior
*inf
= find_inferior_pid (ptid_get_pid (ecs
->ptid
));
1710 delete_step_thread_step_resume_breakpoint ();
1712 /* We may not find an inferior if this was a process exit. */
1713 if (inf
== NULL
|| inf
->stop_soon
== NO_STOP_QUIETLY
)
1716 if (target_has_execution
1717 && ecs
->ws
.kind
!= TARGET_WAITKIND_EXITED
1718 && ecs
->ws
.kind
!= TARGET_WAITKIND_SIGNALLED
1719 && ecs
->event_thread
->step_multi
1720 && ecs
->event_thread
->stop_step
)
1721 inferior_event_handler (INF_EXEC_CONTINUE
, NULL
);
1723 inferior_event_handler (INF_EXEC_COMPLETE
, NULL
);
1726 /* Revert thread and frame. */
1727 do_cleanups (old_chain
);
1729 /* If the inferior was in sync execution mode, and now isn't,
1730 restore the prompt. */
1731 if (was_sync
&& !sync_execution
)
1732 display_gdb_prompt (0);
1735 /* Prepare an execution control state for looping through a
1736 wait_for_inferior-type loop. */
1739 init_execution_control_state (struct execution_control_state
*ecs
)
1741 ecs
->random_signal
= 0;
1744 /* Clear context switchable stepping state. */
1747 init_thread_stepping_state (struct thread_info
*tss
)
1749 struct symtab_and_line sal
;
1751 tss
->stepping_over_breakpoint
= 0;
1752 tss
->step_after_step_resume_breakpoint
= 0;
1753 tss
->stepping_through_solib_after_catch
= 0;
1754 tss
->stepping_through_solib_catchpoints
= NULL
;
1756 sal
= find_pc_line (tss
->prev_pc
, 0);
1757 tss
->current_line
= sal
.line
;
1758 tss
->current_symtab
= sal
.symtab
;
1761 /* Return the cached copy of the last pid/waitstatus returned by
1762 target_wait()/deprecated_target_wait_hook(). The data is actually
1763 cached by handle_inferior_event(), which gets called immediately
1764 after target_wait()/deprecated_target_wait_hook(). */
1767 get_last_target_status (ptid_t
*ptidp
, struct target_waitstatus
*status
)
1769 *ptidp
= target_last_wait_ptid
;
1770 *status
= target_last_waitstatus
;
1774 nullify_last_target_wait_ptid (void)
1776 target_last_wait_ptid
= minus_one_ptid
;
1779 /* Switch thread contexts. */
1782 context_switch (ptid_t ptid
)
1786 fprintf_unfiltered (gdb_stdlog
, "infrun: Switching context from %s ",
1787 target_pid_to_str (inferior_ptid
));
1788 fprintf_unfiltered (gdb_stdlog
, "to %s\n",
1789 target_pid_to_str (ptid
));
1792 switch_to_thread (ptid
);
1796 adjust_pc_after_break (struct execution_control_state
*ecs
)
1798 struct regcache
*regcache
;
1799 struct gdbarch
*gdbarch
;
1800 CORE_ADDR breakpoint_pc
;
1802 /* If we've hit a breakpoint, we'll normally be stopped with SIGTRAP. If
1803 we aren't, just return.
1805 We assume that waitkinds other than TARGET_WAITKIND_STOPPED are not
1806 affected by gdbarch_decr_pc_after_break. Other waitkinds which are
1807 implemented by software breakpoints should be handled through the normal
1810 NOTE drow/2004-01-31: On some targets, breakpoints may generate
1811 different signals (SIGILL or SIGEMT for instance), but it is less
1812 clear where the PC is pointing afterwards. It may not match
1813 gdbarch_decr_pc_after_break. I don't know any specific target that
1814 generates these signals at breakpoints (the code has been in GDB since at
1815 least 1992) so I can not guess how to handle them here.
1817 In earlier versions of GDB, a target with
1818 gdbarch_have_nonsteppable_watchpoint would have the PC after hitting a
1819 watchpoint affected by gdbarch_decr_pc_after_break. I haven't found any
1820 target with both of these set in GDB history, and it seems unlikely to be
1821 correct, so gdbarch_have_nonsteppable_watchpoint is not checked here. */
1823 if (ecs
->ws
.kind
!= TARGET_WAITKIND_STOPPED
)
1826 if (ecs
->ws
.value
.sig
!= TARGET_SIGNAL_TRAP
)
1829 /* In reverse execution, when a breakpoint is hit, the instruction
1830 under it has already been de-executed. The reported PC always
1831 points at the breakpoint address, so adjusting it further would
1832 be wrong. E.g., consider this case on a decr_pc_after_break == 1
1835 B1 0x08000000 : INSN1
1836 B2 0x08000001 : INSN2
1838 PC -> 0x08000003 : INSN4
1840 Say you're stopped at 0x08000003 as above. Reverse continuing
1841 from that point should hit B2 as below. Reading the PC when the
1842 SIGTRAP is reported should read 0x08000001 and INSN2 should have
1843 been de-executed already.
1845 B1 0x08000000 : INSN1
1846 B2 PC -> 0x08000001 : INSN2
1850 We can't apply the same logic as for forward execution, because
1851 we would wrongly adjust the PC to 0x08000000, since there's a
1852 breakpoint at PC - 1. We'd then report a hit on B1, although
1853 INSN1 hadn't been de-executed yet. Doing nothing is the correct
1855 if (execution_direction
== EXEC_REVERSE
)
1858 /* If this target does not decrement the PC after breakpoints, then
1859 we have nothing to do. */
1860 regcache
= get_thread_regcache (ecs
->ptid
);
1861 gdbarch
= get_regcache_arch (regcache
);
1862 if (gdbarch_decr_pc_after_break (gdbarch
) == 0)
1865 /* Find the location where (if we've hit a breakpoint) the
1866 breakpoint would be. */
1867 breakpoint_pc
= regcache_read_pc (regcache
)
1868 - gdbarch_decr_pc_after_break (gdbarch
);
1870 /* Check whether there actually is a software breakpoint inserted at
1873 If in non-stop mode, a race condition is possible where we've
1874 removed a breakpoint, but stop events for that breakpoint were
1875 already queued and arrive later. To suppress those spurious
1876 SIGTRAPs, we keep a list of such breakpoint locations for a bit,
1877 and retire them after a number of stop events are reported. */
1878 if (software_breakpoint_inserted_here_p (breakpoint_pc
)
1879 || (non_stop
&& moribund_breakpoint_here_p (breakpoint_pc
)))
1881 /* When using hardware single-step, a SIGTRAP is reported for both
1882 a completed single-step and a software breakpoint. Need to
1883 differentiate between the two, as the latter needs adjusting
1884 but the former does not.
1886 The SIGTRAP can be due to a completed hardware single-step only if
1887 - we didn't insert software single-step breakpoints
1888 - the thread to be examined is still the current thread
1889 - this thread is currently being stepped
1891 If any of these events did not occur, we must have stopped due
1892 to hitting a software breakpoint, and have to back up to the
1895 As a special case, we could have hardware single-stepped a
1896 software breakpoint. In this case (prev_pc == breakpoint_pc),
1897 we also need to back up to the breakpoint address. */
1899 if (singlestep_breakpoints_inserted_p
1900 || !ptid_equal (ecs
->ptid
, inferior_ptid
)
1901 || !currently_stepping (ecs
->event_thread
)
1902 || ecs
->event_thread
->prev_pc
== breakpoint_pc
)
1903 regcache_write_pc (regcache
, breakpoint_pc
);
1908 init_infwait_state (void)
1910 waiton_ptid
= pid_to_ptid (-1);
1911 infwait_state
= infwait_normal_state
;
1915 error_is_running (void)
1918 Cannot execute this command while the selected thread is running."));
1922 ensure_not_running (void)
1924 if (is_running (inferior_ptid
))
1925 error_is_running ();
1928 /* Given an execution control state that has been freshly filled in
1929 by an event from the inferior, figure out what it means and take
1930 appropriate action. */
1933 handle_inferior_event (struct execution_control_state
*ecs
)
1935 int sw_single_step_trap_p
= 0;
1936 int stopped_by_watchpoint
;
1937 int stepped_after_stopped_by_watchpoint
= 0;
1938 struct symtab_and_line stop_pc_sal
;
1939 enum stop_kind stop_soon
;
1941 if (ecs
->ws
.kind
!= TARGET_WAITKIND_EXITED
1942 && ecs
->ws
.kind
!= TARGET_WAITKIND_SIGNALLED
1943 && ecs
->ws
.kind
!= TARGET_WAITKIND_IGNORE
)
1945 struct inferior
*inf
= find_inferior_pid (ptid_get_pid (ecs
->ptid
));
1947 stop_soon
= inf
->stop_soon
;
1950 stop_soon
= NO_STOP_QUIETLY
;
1952 /* Cache the last pid/waitstatus. */
1953 target_last_wait_ptid
= ecs
->ptid
;
1954 target_last_waitstatus
= ecs
->ws
;
1956 /* Always clear state belonging to the previous time we stopped. */
1957 stop_stack_dummy
= 0;
1959 /* If it's a new process, add it to the thread database */
1961 ecs
->new_thread_event
= (!ptid_equal (ecs
->ptid
, inferior_ptid
)
1962 && !ptid_equal (ecs
->ptid
, minus_one_ptid
)
1963 && !in_thread_list (ecs
->ptid
));
1965 if (ecs
->ws
.kind
!= TARGET_WAITKIND_EXITED
1966 && ecs
->ws
.kind
!= TARGET_WAITKIND_SIGNALLED
&& ecs
->new_thread_event
)
1967 add_thread (ecs
->ptid
);
1969 ecs
->event_thread
= find_thread_pid (ecs
->ptid
);
1971 /* Dependent on valid ECS->EVENT_THREAD. */
1972 adjust_pc_after_break (ecs
);
1974 /* Dependent on the current PC value modified by adjust_pc_after_break. */
1975 reinit_frame_cache ();
1977 if (ecs
->ws
.kind
!= TARGET_WAITKIND_IGNORE
)
1979 breakpoint_retire_moribund ();
1981 /* Mark the non-executing threads accordingly. */
1983 || ecs
->ws
.kind
== TARGET_WAITKIND_EXITED
1984 || ecs
->ws
.kind
== TARGET_WAITKIND_SIGNALLED
)
1985 set_executing (pid_to_ptid (-1), 0);
1987 set_executing (ecs
->ptid
, 0);
1990 switch (infwait_state
)
1992 case infwait_thread_hop_state
:
1994 fprintf_unfiltered (gdb_stdlog
, "infrun: infwait_thread_hop_state\n");
1995 /* Cancel the waiton_ptid. */
1996 waiton_ptid
= pid_to_ptid (-1);
1999 case infwait_normal_state
:
2001 fprintf_unfiltered (gdb_stdlog
, "infrun: infwait_normal_state\n");
2004 case infwait_step_watch_state
:
2006 fprintf_unfiltered (gdb_stdlog
,
2007 "infrun: infwait_step_watch_state\n");
2009 stepped_after_stopped_by_watchpoint
= 1;
2012 case infwait_nonstep_watch_state
:
2014 fprintf_unfiltered (gdb_stdlog
,
2015 "infrun: infwait_nonstep_watch_state\n");
2016 insert_breakpoints ();
2018 /* FIXME-maybe: is this cleaner than setting a flag? Does it
2019 handle things like signals arriving and other things happening
2020 in combination correctly? */
2021 stepped_after_stopped_by_watchpoint
= 1;
2025 internal_error (__FILE__
, __LINE__
, _("bad switch"));
2027 infwait_state
= infwait_normal_state
;
2029 switch (ecs
->ws
.kind
)
2031 case TARGET_WAITKIND_LOADED
:
2033 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_LOADED\n");
2034 /* Ignore gracefully during startup of the inferior, as it might
2035 be the shell which has just loaded some objects, otherwise
2036 add the symbols for the newly loaded objects. Also ignore at
2037 the beginning of an attach or remote session; we will query
2038 the full list of libraries once the connection is
2040 if (stop_soon
== NO_STOP_QUIETLY
)
2042 /* Check for any newly added shared libraries if we're
2043 supposed to be adding them automatically. Switch
2044 terminal for any messages produced by
2045 breakpoint_re_set. */
2046 target_terminal_ours_for_output ();
2047 /* NOTE: cagney/2003-11-25: Make certain that the target
2048 stack's section table is kept up-to-date. Architectures,
2049 (e.g., PPC64), use the section table to perform
2050 operations such as address => section name and hence
2051 require the table to contain all sections (including
2052 those found in shared libraries). */
2053 /* NOTE: cagney/2003-11-25: Pass current_target and not
2054 exec_ops to SOLIB_ADD. This is because current GDB is
2055 only tooled to propagate section_table changes out from
2056 the "current_target" (see target_resize_to_sections), and
2057 not up from the exec stratum. This, of course, isn't
2058 right. "infrun.c" should only interact with the
2059 exec/process stratum, instead relying on the target stack
2060 to propagate relevant changes (stop, section table
2061 changed, ...) up to other layers. */
2063 SOLIB_ADD (NULL
, 0, ¤t_target
, auto_solib_add
);
2065 solib_add (NULL
, 0, ¤t_target
, auto_solib_add
);
2067 target_terminal_inferior ();
2069 /* If requested, stop when the dynamic linker notifies
2070 gdb of events. This allows the user to get control
2071 and place breakpoints in initializer routines for
2072 dynamically loaded objects (among other things). */
2073 if (stop_on_solib_events
)
2075 stop_stepping (ecs
);
2079 /* NOTE drow/2007-05-11: This might be a good place to check
2080 for "catch load". */
2083 /* If we are skipping through a shell, or through shared library
2084 loading that we aren't interested in, resume the program. If
2085 we're running the program normally, also resume. But stop if
2086 we're attaching or setting up a remote connection. */
2087 if (stop_soon
== STOP_QUIETLY
|| stop_soon
== NO_STOP_QUIETLY
)
2089 /* Loading of shared libraries might have changed breakpoint
2090 addresses. Make sure new breakpoints are inserted. */
2091 if (stop_soon
== NO_STOP_QUIETLY
2092 && !breakpoints_always_inserted_mode ())
2093 insert_breakpoints ();
2094 resume (0, TARGET_SIGNAL_0
);
2095 prepare_to_wait (ecs
);
2101 case TARGET_WAITKIND_SPURIOUS
:
2103 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_SPURIOUS\n");
2104 resume (0, TARGET_SIGNAL_0
);
2105 prepare_to_wait (ecs
);
2108 case TARGET_WAITKIND_EXITED
:
2110 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_EXITED\n");
2111 target_terminal_ours (); /* Must do this before mourn anyway */
2112 print_stop_reason (EXITED
, ecs
->ws
.value
.integer
);
2114 /* Record the exit code in the convenience variable $_exitcode, so
2115 that the user can inspect this again later. */
2116 set_internalvar (lookup_internalvar ("_exitcode"),
2117 value_from_longest (builtin_type_int32
,
2118 (LONGEST
) ecs
->ws
.value
.integer
));
2119 gdb_flush (gdb_stdout
);
2120 target_mourn_inferior ();
2121 singlestep_breakpoints_inserted_p
= 0;
2122 stop_print_frame
= 0;
2123 stop_stepping (ecs
);
2126 case TARGET_WAITKIND_SIGNALLED
:
2128 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_SIGNALLED\n");
2129 stop_print_frame
= 0;
2130 target_terminal_ours (); /* Must do this before mourn anyway */
2132 /* Note: By definition of TARGET_WAITKIND_SIGNALLED, we shouldn't
2133 reach here unless the inferior is dead. However, for years
2134 target_kill() was called here, which hints that fatal signals aren't
2135 really fatal on some systems. If that's true, then some changes
2137 target_mourn_inferior ();
2139 print_stop_reason (SIGNAL_EXITED
, ecs
->ws
.value
.sig
);
2140 singlestep_breakpoints_inserted_p
= 0;
2141 stop_stepping (ecs
);
2144 /* The following are the only cases in which we keep going;
2145 the above cases end in a continue or goto. */
2146 case TARGET_WAITKIND_FORKED
:
2147 case TARGET_WAITKIND_VFORKED
:
2149 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_FORKED\n");
2150 pending_follow
.kind
= ecs
->ws
.kind
;
2152 pending_follow
.fork_event
.parent_pid
= ecs
->ptid
;
2153 pending_follow
.fork_event
.child_pid
= ecs
->ws
.value
.related_pid
;
2155 if (!ptid_equal (ecs
->ptid
, inferior_ptid
))
2157 context_switch (ecs
->ptid
);
2158 reinit_frame_cache ();
2161 stop_pc
= read_pc ();
2163 ecs
->event_thread
->stop_bpstat
= bpstat_stop_status (stop_pc
, ecs
->ptid
);
2165 ecs
->random_signal
= !bpstat_explains_signal (ecs
->event_thread
->stop_bpstat
);
2167 /* If no catchpoint triggered for this, then keep going. */
2168 if (ecs
->random_signal
)
2170 ecs
->event_thread
->stop_signal
= TARGET_SIGNAL_0
;
2174 ecs
->event_thread
->stop_signal
= TARGET_SIGNAL_TRAP
;
2175 goto process_event_stop_test
;
2177 case TARGET_WAITKIND_EXECD
:
2179 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_EXECD\n");
2180 pending_follow
.execd_pathname
=
2181 savestring (ecs
->ws
.value
.execd_pathname
,
2182 strlen (ecs
->ws
.value
.execd_pathname
));
2184 if (!ptid_equal (ecs
->ptid
, inferior_ptid
))
2186 context_switch (ecs
->ptid
);
2187 reinit_frame_cache ();
2190 stop_pc
= read_pc ();
2192 /* This causes the eventpoints and symbol table to be reset.
2193 Must do this now, before trying to determine whether to
2195 follow_exec (inferior_ptid
, pending_follow
.execd_pathname
);
2196 xfree (pending_follow
.execd_pathname
);
2198 ecs
->event_thread
->stop_bpstat
= bpstat_stop_status (stop_pc
, ecs
->ptid
);
2199 ecs
->random_signal
= !bpstat_explains_signal (ecs
->event_thread
->stop_bpstat
);
2201 /* If no catchpoint triggered for this, then keep going. */
2202 if (ecs
->random_signal
)
2204 ecs
->event_thread
->stop_signal
= TARGET_SIGNAL_0
;
2208 ecs
->event_thread
->stop_signal
= TARGET_SIGNAL_TRAP
;
2209 goto process_event_stop_test
;
2211 /* Be careful not to try to gather much state about a thread
2212 that's in a syscall. It's frequently a losing proposition. */
2213 case TARGET_WAITKIND_SYSCALL_ENTRY
:
2215 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_SYSCALL_ENTRY\n");
2216 resume (0, TARGET_SIGNAL_0
);
2217 prepare_to_wait (ecs
);
2220 /* Before examining the threads further, step this thread to
2221 get it entirely out of the syscall. (We get notice of the
2222 event when the thread is just on the verge of exiting a
2223 syscall. Stepping one instruction seems to get it back
2225 case TARGET_WAITKIND_SYSCALL_RETURN
:
2227 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_SYSCALL_RETURN\n");
2228 target_resume (ecs
->ptid
, 1, TARGET_SIGNAL_0
);
2229 prepare_to_wait (ecs
);
2232 case TARGET_WAITKIND_STOPPED
:
2234 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_STOPPED\n");
2235 ecs
->event_thread
->stop_signal
= ecs
->ws
.value
.sig
;
2238 case TARGET_WAITKIND_NO_HISTORY
:
2239 /* Reverse execution: target ran out of history info. */
2240 stop_pc
= read_pc ();
2241 print_stop_reason (NO_HISTORY
, 0);
2242 stop_stepping (ecs
);
2245 /* We had an event in the inferior, but we are not interested
2246 in handling it at this level. The lower layers have already
2247 done what needs to be done, if anything.
2249 One of the possible circumstances for this is when the
2250 inferior produces output for the console. The inferior has
2251 not stopped, and we are ignoring the event. Another possible
2252 circumstance is any event which the lower level knows will be
2253 reported multiple times without an intervening resume. */
2254 case TARGET_WAITKIND_IGNORE
:
2256 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_IGNORE\n");
2257 prepare_to_wait (ecs
);
2261 if (ecs
->new_thread_event
)
2264 /* Non-stop assumes that the target handles adding new threads
2265 to the thread list. */
2266 internal_error (__FILE__
, __LINE__
, "\
2267 targets should add new threads to the thread list themselves in non-stop mode.");
2269 /* We may want to consider not doing a resume here in order to
2270 give the user a chance to play with the new thread. It might
2271 be good to make that a user-settable option. */
2273 /* At this point, all threads are stopped (happens automatically
2274 in either the OS or the native code). Therefore we need to
2275 continue all threads in order to make progress. */
2277 target_resume (RESUME_ALL
, 0, TARGET_SIGNAL_0
);
2278 prepare_to_wait (ecs
);
2282 /* Do we need to clean up the state of a thread that has completed a
2283 displaced single-step? (Doing so usually affects the PC, so do
2284 it here, before we set stop_pc.) */
2285 if (ecs
->ws
.kind
== TARGET_WAITKIND_STOPPED
)
2286 displaced_step_fixup (ecs
->ptid
, ecs
->event_thread
->stop_signal
);
2288 stop_pc
= regcache_read_pc (get_thread_regcache (ecs
->ptid
));
2292 fprintf_unfiltered (gdb_stdlog
, "infrun: stop_pc = 0x%s\n",
2293 paddr_nz (stop_pc
));
2294 if (STOPPED_BY_WATCHPOINT (&ecs
->ws
))
2297 fprintf_unfiltered (gdb_stdlog
, "infrun: stopped by watchpoint\n");
2299 if (target_stopped_data_address (¤t_target
, &addr
))
2300 fprintf_unfiltered (gdb_stdlog
,
2301 "infrun: stopped data address = 0x%s\n",
2304 fprintf_unfiltered (gdb_stdlog
,
2305 "infrun: (no data address available)\n");
2309 if (stepping_past_singlestep_breakpoint
)
2311 gdb_assert (singlestep_breakpoints_inserted_p
);
2312 gdb_assert (ptid_equal (singlestep_ptid
, ecs
->ptid
));
2313 gdb_assert (!ptid_equal (singlestep_ptid
, saved_singlestep_ptid
));
2315 stepping_past_singlestep_breakpoint
= 0;
2317 /* We've either finished single-stepping past the single-step
2318 breakpoint, or stopped for some other reason. It would be nice if
2319 we could tell, but we can't reliably. */
2320 if (ecs
->event_thread
->stop_signal
== TARGET_SIGNAL_TRAP
)
2323 fprintf_unfiltered (gdb_stdlog
, "infrun: stepping_past_singlestep_breakpoint\n");
2324 /* Pull the single step breakpoints out of the target. */
2325 remove_single_step_breakpoints ();
2326 singlestep_breakpoints_inserted_p
= 0;
2328 ecs
->random_signal
= 0;
2330 context_switch (saved_singlestep_ptid
);
2331 if (deprecated_context_hook
)
2332 deprecated_context_hook (pid_to_thread_id (ecs
->ptid
));
2334 resume (1, TARGET_SIGNAL_0
);
2335 prepare_to_wait (ecs
);
2340 stepping_past_singlestep_breakpoint
= 0;
2342 if (!ptid_equal (deferred_step_ptid
, null_ptid
))
2344 /* In non-stop mode, there's never a deferred_step_ptid set. */
2345 gdb_assert (!non_stop
);
2347 /* If we stopped for some other reason than single-stepping, ignore
2348 the fact that we were supposed to switch back. */
2349 if (ecs
->event_thread
->stop_signal
== TARGET_SIGNAL_TRAP
)
2351 struct thread_info
*tp
;
2354 fprintf_unfiltered (gdb_stdlog
,
2355 "infrun: handling deferred step\n");
2357 /* Pull the single step breakpoints out of the target. */
2358 if (singlestep_breakpoints_inserted_p
)
2360 remove_single_step_breakpoints ();
2361 singlestep_breakpoints_inserted_p
= 0;
2364 /* Note: We do not call context_switch at this point, as the
2365 context is already set up for stepping the original thread. */
2366 switch_to_thread (deferred_step_ptid
);
2367 deferred_step_ptid
= null_ptid
;
2368 /* Suppress spurious "Switching to ..." message. */
2369 previous_inferior_ptid
= inferior_ptid
;
2371 resume (1, TARGET_SIGNAL_0
);
2372 prepare_to_wait (ecs
);
2376 deferred_step_ptid
= null_ptid
;
2379 /* See if a thread hit a thread-specific breakpoint that was meant for
2380 another thread. If so, then step that thread past the breakpoint,
2383 if (ecs
->event_thread
->stop_signal
== TARGET_SIGNAL_TRAP
)
2385 int thread_hop_needed
= 0;
2387 /* Check if a regular breakpoint has been hit before checking
2388 for a potential single step breakpoint. Otherwise, GDB will
2389 not see this breakpoint hit when stepping onto breakpoints. */
2390 if (regular_breakpoint_inserted_here_p (stop_pc
))
2392 ecs
->random_signal
= 0;
2393 if (!breakpoint_thread_match (stop_pc
, ecs
->ptid
))
2394 thread_hop_needed
= 1;
2396 else if (singlestep_breakpoints_inserted_p
)
2398 /* We have not context switched yet, so this should be true
2399 no matter which thread hit the singlestep breakpoint. */
2400 gdb_assert (ptid_equal (inferior_ptid
, singlestep_ptid
));
2402 fprintf_unfiltered (gdb_stdlog
, "infrun: software single step "
2404 target_pid_to_str (ecs
->ptid
));
2406 ecs
->random_signal
= 0;
2407 /* The call to in_thread_list is necessary because PTIDs sometimes
2408 change when we go from single-threaded to multi-threaded. If
2409 the singlestep_ptid is still in the list, assume that it is
2410 really different from ecs->ptid. */
2411 if (!ptid_equal (singlestep_ptid
, ecs
->ptid
)
2412 && in_thread_list (singlestep_ptid
))
2414 /* If the PC of the thread we were trying to single-step
2415 has changed, discard this event (which we were going
2416 to ignore anyway), and pretend we saw that thread
2417 trap. This prevents us continuously moving the
2418 single-step breakpoint forward, one instruction at a
2419 time. If the PC has changed, then the thread we were
2420 trying to single-step has trapped or been signalled,
2421 but the event has not been reported to GDB yet.
2423 There might be some cases where this loses signal
2424 information, if a signal has arrived at exactly the
2425 same time that the PC changed, but this is the best
2426 we can do with the information available. Perhaps we
2427 should arrange to report all events for all threads
2428 when they stop, or to re-poll the remote looking for
2429 this particular thread (i.e. temporarily enable
2432 CORE_ADDR new_singlestep_pc
2433 = regcache_read_pc (get_thread_regcache (singlestep_ptid
));
2435 if (new_singlestep_pc
!= singlestep_pc
)
2437 enum target_signal stop_signal
;
2440 fprintf_unfiltered (gdb_stdlog
, "infrun: unexpected thread,"
2441 " but expected thread advanced also\n");
2443 /* The current context still belongs to
2444 singlestep_ptid. Don't swap here, since that's
2445 the context we want to use. Just fudge our
2446 state and continue. */
2447 stop_signal
= ecs
->event_thread
->stop_signal
;
2448 ecs
->event_thread
->stop_signal
= TARGET_SIGNAL_0
;
2449 ecs
->ptid
= singlestep_ptid
;
2450 ecs
->event_thread
= find_thread_pid (ecs
->ptid
);
2451 ecs
->event_thread
->stop_signal
= stop_signal
;
2452 stop_pc
= new_singlestep_pc
;
2457 fprintf_unfiltered (gdb_stdlog
,
2458 "infrun: unexpected thread\n");
2460 thread_hop_needed
= 1;
2461 stepping_past_singlestep_breakpoint
= 1;
2462 saved_singlestep_ptid
= singlestep_ptid
;
2467 if (thread_hop_needed
)
2469 int remove_status
= 0;
2472 fprintf_unfiltered (gdb_stdlog
, "infrun: thread_hop_needed\n");
2474 /* Saw a breakpoint, but it was hit by the wrong thread.
2477 if (singlestep_breakpoints_inserted_p
)
2479 /* Pull the single step breakpoints out of the target. */
2480 remove_single_step_breakpoints ();
2481 singlestep_breakpoints_inserted_p
= 0;
2484 /* If the arch can displace step, don't remove the
2486 if (!use_displaced_stepping (current_gdbarch
))
2487 remove_status
= remove_breakpoints ();
2489 /* Did we fail to remove breakpoints? If so, try
2490 to set the PC past the bp. (There's at least
2491 one situation in which we can fail to remove
2492 the bp's: On HP-UX's that use ttrace, we can't
2493 change the address space of a vforking child
2494 process until the child exits (well, okay, not
2495 then either :-) or execs. */
2496 if (remove_status
!= 0)
2497 error (_("Cannot step over breakpoint hit in wrong thread"));
2500 if (!ptid_equal (inferior_ptid
, ecs
->ptid
))
2501 context_switch (ecs
->ptid
);
2505 /* Only need to require the next event from this
2506 thread in all-stop mode. */
2507 waiton_ptid
= ecs
->ptid
;
2508 infwait_state
= infwait_thread_hop_state
;
2511 ecs
->event_thread
->stepping_over_breakpoint
= 1;
2513 registers_changed ();
2517 else if (singlestep_breakpoints_inserted_p
)
2519 sw_single_step_trap_p
= 1;
2520 ecs
->random_signal
= 0;
2524 ecs
->random_signal
= 1;
2526 /* See if something interesting happened to the non-current thread. If
2527 so, then switch to that thread. */
2528 if (!ptid_equal (ecs
->ptid
, inferior_ptid
))
2531 fprintf_unfiltered (gdb_stdlog
, "infrun: context switch\n");
2533 context_switch (ecs
->ptid
);
2535 if (deprecated_context_hook
)
2536 deprecated_context_hook (pid_to_thread_id (ecs
->ptid
));
2539 if (singlestep_breakpoints_inserted_p
)
2541 /* Pull the single step breakpoints out of the target. */
2542 remove_single_step_breakpoints ();
2543 singlestep_breakpoints_inserted_p
= 0;
2546 if (stepped_after_stopped_by_watchpoint
)
2547 stopped_by_watchpoint
= 0;
2549 stopped_by_watchpoint
= watchpoints_triggered (&ecs
->ws
);
2551 /* If necessary, step over this watchpoint. We'll be back to display
2553 if (stopped_by_watchpoint
2554 && (HAVE_STEPPABLE_WATCHPOINT
2555 || gdbarch_have_nonsteppable_watchpoint (current_gdbarch
)))
2557 /* At this point, we are stopped at an instruction which has
2558 attempted to write to a piece of memory under control of
2559 a watchpoint. The instruction hasn't actually executed
2560 yet. If we were to evaluate the watchpoint expression
2561 now, we would get the old value, and therefore no change
2562 would seem to have occurred.
2564 In order to make watchpoints work `right', we really need
2565 to complete the memory write, and then evaluate the
2566 watchpoint expression. We do this by single-stepping the
2569 It may not be necessary to disable the watchpoint to stop over
2570 it. For example, the PA can (with some kernel cooperation)
2571 single step over a watchpoint without disabling the watchpoint.
2573 It is far more common to need to disable a watchpoint to step
2574 the inferior over it. If we have non-steppable watchpoints,
2575 we must disable the current watchpoint; it's simplest to
2576 disable all watchpoints and breakpoints. */
2578 if (!HAVE_STEPPABLE_WATCHPOINT
)
2579 remove_breakpoints ();
2580 registers_changed ();
2581 target_resume (ecs
->ptid
, 1, TARGET_SIGNAL_0
); /* Single step */
2582 waiton_ptid
= ecs
->ptid
;
2583 if (HAVE_STEPPABLE_WATCHPOINT
)
2584 infwait_state
= infwait_step_watch_state
;
2586 infwait_state
= infwait_nonstep_watch_state
;
2587 prepare_to_wait (ecs
);
2591 ecs
->stop_func_start
= 0;
2592 ecs
->stop_func_end
= 0;
2593 ecs
->stop_func_name
= 0;
2594 /* Don't care about return value; stop_func_start and stop_func_name
2595 will both be 0 if it doesn't work. */
2596 find_pc_partial_function (stop_pc
, &ecs
->stop_func_name
,
2597 &ecs
->stop_func_start
, &ecs
->stop_func_end
);
2598 ecs
->stop_func_start
2599 += gdbarch_deprecated_function_start_offset (current_gdbarch
);
2600 ecs
->event_thread
->stepping_over_breakpoint
= 0;
2601 bpstat_clear (&ecs
->event_thread
->stop_bpstat
);
2602 ecs
->event_thread
->stop_step
= 0;
2603 stop_print_frame
= 1;
2604 ecs
->random_signal
= 0;
2605 stopped_by_random_signal
= 0;
2607 if (ecs
->event_thread
->stop_signal
== TARGET_SIGNAL_TRAP
2608 && ecs
->event_thread
->trap_expected
2609 && gdbarch_single_step_through_delay_p (current_gdbarch
)
2610 && currently_stepping (ecs
->event_thread
))
2612 /* We're trying to step off a breakpoint. Turns out that we're
2613 also on an instruction that needs to be stepped multiple
2614 times before it's been fully executing. E.g., architectures
2615 with a delay slot. It needs to be stepped twice, once for
2616 the instruction and once for the delay slot. */
2617 int step_through_delay
2618 = gdbarch_single_step_through_delay (current_gdbarch
,
2619 get_current_frame ());
2620 if (debug_infrun
&& step_through_delay
)
2621 fprintf_unfiltered (gdb_stdlog
, "infrun: step through delay\n");
2622 if (ecs
->event_thread
->step_range_end
== 0 && step_through_delay
)
2624 /* The user issued a continue when stopped at a breakpoint.
2625 Set up for another trap and get out of here. */
2626 ecs
->event_thread
->stepping_over_breakpoint
= 1;
2630 else if (step_through_delay
)
2632 /* The user issued a step when stopped at a breakpoint.
2633 Maybe we should stop, maybe we should not - the delay
2634 slot *might* correspond to a line of source. In any
2635 case, don't decide that here, just set
2636 ecs->stepping_over_breakpoint, making sure we
2637 single-step again before breakpoints are re-inserted. */
2638 ecs
->event_thread
->stepping_over_breakpoint
= 1;
2642 /* Look at the cause of the stop, and decide what to do.
2643 The alternatives are:
2644 1) stop_stepping and return; to really stop and return to the debugger,
2645 2) keep_going and return to start up again
2646 (set ecs->event_thread->stepping_over_breakpoint to 1 to single step once)
2647 3) set ecs->random_signal to 1, and the decision between 1 and 2
2648 will be made according to the signal handling tables. */
2650 /* First, distinguish signals caused by the debugger from signals
2651 that have to do with the program's own actions. Note that
2652 breakpoint insns may cause SIGTRAP or SIGILL or SIGEMT, depending
2653 on the operating system version. Here we detect when a SIGILL or
2654 SIGEMT is really a breakpoint and change it to SIGTRAP. We do
2655 something similar for SIGSEGV, since a SIGSEGV will be generated
2656 when we're trying to execute a breakpoint instruction on a
2657 non-executable stack. This happens for call dummy breakpoints
2658 for architectures like SPARC that place call dummies on the
2661 If we're doing a displaced step past a breakpoint, then the
2662 breakpoint is always inserted at the original instruction;
2663 non-standard signals can't be explained by the breakpoint. */
2664 if (ecs
->event_thread
->stop_signal
== TARGET_SIGNAL_TRAP
2665 || (! ecs
->event_thread
->trap_expected
2666 && breakpoint_inserted_here_p (stop_pc
)
2667 && (ecs
->event_thread
->stop_signal
== TARGET_SIGNAL_ILL
2668 || ecs
->event_thread
->stop_signal
== TARGET_SIGNAL_SEGV
2669 || ecs
->event_thread
->stop_signal
== TARGET_SIGNAL_EMT
))
2670 || stop_soon
== STOP_QUIETLY
|| stop_soon
== STOP_QUIETLY_NO_SIGSTOP
2671 || stop_soon
== STOP_QUIETLY_REMOTE
)
2673 if (ecs
->event_thread
->stop_signal
== TARGET_SIGNAL_TRAP
&& stop_after_trap
)
2676 fprintf_unfiltered (gdb_stdlog
, "infrun: stopped\n");
2677 stop_print_frame
= 0;
2678 stop_stepping (ecs
);
2682 /* This is originated from start_remote(), start_inferior() and
2683 shared libraries hook functions. */
2684 if (stop_soon
== STOP_QUIETLY
|| stop_soon
== STOP_QUIETLY_REMOTE
)
2687 fprintf_unfiltered (gdb_stdlog
, "infrun: quietly stopped\n");
2688 stop_stepping (ecs
);
2692 /* This originates from attach_command(). We need to overwrite
2693 the stop_signal here, because some kernels don't ignore a
2694 SIGSTOP in a subsequent ptrace(PTRACE_CONT,SIGSTOP) call.
2695 See more comments in inferior.h. On the other hand, if we
2696 get a non-SIGSTOP, report it to the user - assume the backend
2697 will handle the SIGSTOP if it should show up later.
2699 Also consider that the attach is complete when we see a
2700 SIGTRAP. Some systems (e.g. Windows), and stubs supporting
2701 target extended-remote report it instead of a SIGSTOP
2702 (e.g. gdbserver). We already rely on SIGTRAP being our
2703 signal, so this is no exception. */
2704 if (stop_soon
== STOP_QUIETLY_NO_SIGSTOP
2705 && (ecs
->event_thread
->stop_signal
== TARGET_SIGNAL_STOP
2706 || ecs
->event_thread
->stop_signal
== TARGET_SIGNAL_TRAP
))
2708 stop_stepping (ecs
);
2709 ecs
->event_thread
->stop_signal
= TARGET_SIGNAL_0
;
2713 /* See if there is a breakpoint at the current PC. */
2714 ecs
->event_thread
->stop_bpstat
= bpstat_stop_status (stop_pc
, ecs
->ptid
);
2716 /* Following in case break condition called a
2718 stop_print_frame
= 1;
2720 /* NOTE: cagney/2003-03-29: These two checks for a random signal
2721 at one stage in the past included checks for an inferior
2722 function call's call dummy's return breakpoint. The original
2723 comment, that went with the test, read:
2725 ``End of a stack dummy. Some systems (e.g. Sony news) give
2726 another signal besides SIGTRAP, so check here as well as
2729 If someone ever tries to get call dummys on a
2730 non-executable stack to work (where the target would stop
2731 with something like a SIGSEGV), then those tests might need
2732 to be re-instated. Given, however, that the tests were only
2733 enabled when momentary breakpoints were not being used, I
2734 suspect that it won't be the case.
2736 NOTE: kettenis/2004-02-05: Indeed such checks don't seem to
2737 be necessary for call dummies on a non-executable stack on
2740 if (ecs
->event_thread
->stop_signal
== TARGET_SIGNAL_TRAP
)
2742 = !(bpstat_explains_signal (ecs
->event_thread
->stop_bpstat
)
2743 || ecs
->event_thread
->trap_expected
2744 || (ecs
->event_thread
->step_range_end
2745 && ecs
->event_thread
->step_resume_breakpoint
== NULL
));
2748 ecs
->random_signal
= !bpstat_explains_signal (ecs
->event_thread
->stop_bpstat
);
2749 if (!ecs
->random_signal
)
2750 ecs
->event_thread
->stop_signal
= TARGET_SIGNAL_TRAP
;
2754 /* When we reach this point, we've pretty much decided
2755 that the reason for stopping must've been a random
2756 (unexpected) signal. */
2759 ecs
->random_signal
= 1;
2761 process_event_stop_test
:
2762 /* For the program's own signals, act according to
2763 the signal handling tables. */
2765 if (ecs
->random_signal
)
2767 /* Signal not for debugging purposes. */
2771 fprintf_unfiltered (gdb_stdlog
, "infrun: random signal %d\n",
2772 ecs
->event_thread
->stop_signal
);
2774 stopped_by_random_signal
= 1;
2776 if (signal_print
[ecs
->event_thread
->stop_signal
])
2779 target_terminal_ours_for_output ();
2780 print_stop_reason (SIGNAL_RECEIVED
, ecs
->event_thread
->stop_signal
);
2782 /* Always stop on signals if we're just gaining control of the
2784 if (stop_soon
!= NO_STOP_QUIETLY
2785 || signal_stop_state (ecs
->event_thread
->stop_signal
))
2787 stop_stepping (ecs
);
2790 /* If not going to stop, give terminal back
2791 if we took it away. */
2793 target_terminal_inferior ();
2795 /* Clear the signal if it should not be passed. */
2796 if (signal_program
[ecs
->event_thread
->stop_signal
] == 0)
2797 ecs
->event_thread
->stop_signal
= TARGET_SIGNAL_0
;
2799 if (ecs
->event_thread
->prev_pc
== read_pc ()
2800 && ecs
->event_thread
->trap_expected
2801 && ecs
->event_thread
->step_resume_breakpoint
== NULL
)
2803 /* We were just starting a new sequence, attempting to
2804 single-step off of a breakpoint and expecting a SIGTRAP.
2805 Instead this signal arrives. This signal will take us out
2806 of the stepping range so GDB needs to remember to, when
2807 the signal handler returns, resume stepping off that
2809 /* To simplify things, "continue" is forced to use the same
2810 code paths as single-step - set a breakpoint at the
2811 signal return address and then, once hit, step off that
2814 fprintf_unfiltered (gdb_stdlog
,
2815 "infrun: signal arrived while stepping over "
2818 insert_step_resume_breakpoint_at_frame (get_current_frame ());
2819 ecs
->event_thread
->step_after_step_resume_breakpoint
= 1;
2824 if (ecs
->event_thread
->step_range_end
!= 0
2825 && ecs
->event_thread
->stop_signal
!= TARGET_SIGNAL_0
2826 && (ecs
->event_thread
->step_range_start
<= stop_pc
2827 && stop_pc
< ecs
->event_thread
->step_range_end
)
2828 && frame_id_eq (get_frame_id (get_current_frame ()),
2829 ecs
->event_thread
->step_frame_id
)
2830 && ecs
->event_thread
->step_resume_breakpoint
== NULL
)
2832 /* The inferior is about to take a signal that will take it
2833 out of the single step range. Set a breakpoint at the
2834 current PC (which is presumably where the signal handler
2835 will eventually return) and then allow the inferior to
2838 Note that this is only needed for a signal delivered
2839 while in the single-step range. Nested signals aren't a
2840 problem as they eventually all return. */
2842 fprintf_unfiltered (gdb_stdlog
,
2843 "infrun: signal may take us out of "
2844 "single-step range\n");
2846 insert_step_resume_breakpoint_at_frame (get_current_frame ());
2851 /* Note: step_resume_breakpoint may be non-NULL. This occures
2852 when either there's a nested signal, or when there's a
2853 pending signal enabled just as the signal handler returns
2854 (leaving the inferior at the step-resume-breakpoint without
2855 actually executing it). Either way continue until the
2856 breakpoint is really hit. */
2861 /* Handle cases caused by hitting a breakpoint. */
2863 CORE_ADDR jmp_buf_pc
;
2864 struct bpstat_what what
;
2866 what
= bpstat_what (ecs
->event_thread
->stop_bpstat
);
2868 if (what
.call_dummy
)
2870 stop_stack_dummy
= 1;
2873 switch (what
.main_action
)
2875 case BPSTAT_WHAT_SET_LONGJMP_RESUME
:
2876 /* If we hit the breakpoint at longjmp while stepping, we
2877 install a momentary breakpoint at the target of the
2881 fprintf_unfiltered (gdb_stdlog
,
2882 "infrun: BPSTAT_WHAT_SET_LONGJMP_RESUME\n");
2884 ecs
->event_thread
->stepping_over_breakpoint
= 1;
2886 if (!gdbarch_get_longjmp_target_p (current_gdbarch
)
2887 || !gdbarch_get_longjmp_target (current_gdbarch
,
2888 get_current_frame (), &jmp_buf_pc
))
2891 fprintf_unfiltered (gdb_stdlog
, "\
2892 infrun: BPSTAT_WHAT_SET_LONGJMP_RESUME (!gdbarch_get_longjmp_target)\n");
2897 /* We're going to replace the current step-resume breakpoint
2898 with a longjmp-resume breakpoint. */
2899 delete_step_resume_breakpoint (ecs
->event_thread
);
2901 /* Insert a breakpoint at resume address. */
2902 insert_longjmp_resume_breakpoint (jmp_buf_pc
);
2907 case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME
:
2909 fprintf_unfiltered (gdb_stdlog
,
2910 "infrun: BPSTAT_WHAT_CLEAR_LONGJMP_RESUME\n");
2912 gdb_assert (ecs
->event_thread
->step_resume_breakpoint
!= NULL
);
2913 delete_step_resume_breakpoint (ecs
->event_thread
);
2915 ecs
->event_thread
->stop_step
= 1;
2916 print_stop_reason (END_STEPPING_RANGE
, 0);
2917 stop_stepping (ecs
);
2920 case BPSTAT_WHAT_SINGLE
:
2922 fprintf_unfiltered (gdb_stdlog
, "infrun: BPSTAT_WHAT_SINGLE\n");
2923 ecs
->event_thread
->stepping_over_breakpoint
= 1;
2924 /* Still need to check other stuff, at least the case
2925 where we are stepping and step out of the right range. */
2928 case BPSTAT_WHAT_STOP_NOISY
:
2930 fprintf_unfiltered (gdb_stdlog
, "infrun: BPSTAT_WHAT_STOP_NOISY\n");
2931 stop_print_frame
= 1;
2933 /* We are about to nuke the step_resume_breakpointt via the
2934 cleanup chain, so no need to worry about it here. */
2936 stop_stepping (ecs
);
2939 case BPSTAT_WHAT_STOP_SILENT
:
2941 fprintf_unfiltered (gdb_stdlog
, "infrun: BPSTAT_WHAT_STOP_SILENT\n");
2942 stop_print_frame
= 0;
2944 /* We are about to nuke the step_resume_breakpoin via the
2945 cleanup chain, so no need to worry about it here. */
2947 stop_stepping (ecs
);
2950 case BPSTAT_WHAT_STEP_RESUME
:
2952 fprintf_unfiltered (gdb_stdlog
, "infrun: BPSTAT_WHAT_STEP_RESUME\n");
2954 delete_step_resume_breakpoint (ecs
->event_thread
);
2955 if (ecs
->event_thread
->step_after_step_resume_breakpoint
)
2957 /* Back when the step-resume breakpoint was inserted, we
2958 were trying to single-step off a breakpoint. Go back
2960 ecs
->event_thread
->step_after_step_resume_breakpoint
= 0;
2961 ecs
->event_thread
->stepping_over_breakpoint
= 1;
2965 if (stop_pc
== ecs
->stop_func_start
2966 && execution_direction
== EXEC_REVERSE
)
2968 /* We are stepping over a function call in reverse, and
2969 just hit the step-resume breakpoint at the start
2970 address of the function. Go back to single-stepping,
2971 which should take us back to the function call. */
2972 ecs
->event_thread
->stepping_over_breakpoint
= 1;
2978 case BPSTAT_WHAT_CHECK_SHLIBS
:
2979 case BPSTAT_WHAT_CHECK_SHLIBS_RESUME_FROM_HOOK
:
2982 fprintf_unfiltered (gdb_stdlog
, "infrun: BPSTAT_WHAT_CHECK_SHLIBS\n");
2984 /* Check for any newly added shared libraries if we're
2985 supposed to be adding them automatically. Switch
2986 terminal for any messages produced by
2987 breakpoint_re_set. */
2988 target_terminal_ours_for_output ();
2989 /* NOTE: cagney/2003-11-25: Make certain that the target
2990 stack's section table is kept up-to-date. Architectures,
2991 (e.g., PPC64), use the section table to perform
2992 operations such as address => section name and hence
2993 require the table to contain all sections (including
2994 those found in shared libraries). */
2995 /* NOTE: cagney/2003-11-25: Pass current_target and not
2996 exec_ops to SOLIB_ADD. This is because current GDB is
2997 only tooled to propagate section_table changes out from
2998 the "current_target" (see target_resize_to_sections), and
2999 not up from the exec stratum. This, of course, isn't
3000 right. "infrun.c" should only interact with the
3001 exec/process stratum, instead relying on the target stack
3002 to propagate relevant changes (stop, section table
3003 changed, ...) up to other layers. */
3005 SOLIB_ADD (NULL
, 0, ¤t_target
, auto_solib_add
);
3007 solib_add (NULL
, 0, ¤t_target
, auto_solib_add
);
3009 target_terminal_inferior ();
3011 /* If requested, stop when the dynamic linker notifies
3012 gdb of events. This allows the user to get control
3013 and place breakpoints in initializer routines for
3014 dynamically loaded objects (among other things). */
3015 if (stop_on_solib_events
|| stop_stack_dummy
)
3017 stop_stepping (ecs
);
3021 /* If we stopped due to an explicit catchpoint, then the
3022 (see above) call to SOLIB_ADD pulled in any symbols
3023 from a newly-loaded library, if appropriate.
3025 We do want the inferior to stop, but not where it is
3026 now, which is in the dynamic linker callback. Rather,
3027 we would like it stop in the user's program, just after
3028 the call that caused this catchpoint to trigger. That
3029 gives the user a more useful vantage from which to
3030 examine their program's state. */
3031 else if (what
.main_action
3032 == BPSTAT_WHAT_CHECK_SHLIBS_RESUME_FROM_HOOK
)
3034 /* ??rehrauer: If I could figure out how to get the
3035 right return PC from here, we could just set a temp
3036 breakpoint and resume. I'm not sure we can without
3037 cracking open the dld's shared libraries and sniffing
3038 their unwind tables and text/data ranges, and that's
3039 not a terribly portable notion.
3041 Until that time, we must step the inferior out of the
3042 dld callback, and also out of the dld itself (and any
3043 code or stubs in libdld.sl, such as "shl_load" and
3044 friends) until we reach non-dld code. At that point,
3045 we can stop stepping. */
3046 bpstat_get_triggered_catchpoints (ecs
->event_thread
->stop_bpstat
,
3049 stepping_through_solib_catchpoints
);
3050 ecs
->event_thread
->stepping_through_solib_after_catch
= 1;
3052 /* Be sure to lift all breakpoints, so the inferior does
3053 actually step past this point... */
3054 ecs
->event_thread
->stepping_over_breakpoint
= 1;
3059 /* We want to step over this breakpoint, then keep going. */
3060 ecs
->event_thread
->stepping_over_breakpoint
= 1;
3066 case BPSTAT_WHAT_LAST
:
3067 /* Not a real code, but listed here to shut up gcc -Wall. */
3069 case BPSTAT_WHAT_KEEP_CHECKING
:
3074 /* We come here if we hit a breakpoint but should not
3075 stop for it. Possibly we also were stepping
3076 and should stop for that. So fall through and
3077 test for stepping. But, if not stepping,
3080 /* Are we stepping to get the inferior out of the dynamic linker's
3081 hook (and possibly the dld itself) after catching a shlib
3083 if (ecs
->event_thread
->stepping_through_solib_after_catch
)
3085 #if defined(SOLIB_ADD)
3086 /* Have we reached our destination? If not, keep going. */
3087 if (SOLIB_IN_DYNAMIC_LINKER (PIDGET (ecs
->ptid
), stop_pc
))
3090 fprintf_unfiltered (gdb_stdlog
, "infrun: stepping in dynamic linker\n");
3091 ecs
->event_thread
->stepping_over_breakpoint
= 1;
3097 fprintf_unfiltered (gdb_stdlog
, "infrun: step past dynamic linker\n");
3098 /* Else, stop and report the catchpoint(s) whose triggering
3099 caused us to begin stepping. */
3100 ecs
->event_thread
->stepping_through_solib_after_catch
= 0;
3101 bpstat_clear (&ecs
->event_thread
->stop_bpstat
);
3102 ecs
->event_thread
->stop_bpstat
3103 = bpstat_copy (ecs
->event_thread
->stepping_through_solib_catchpoints
);
3104 bpstat_clear (&ecs
->event_thread
->stepping_through_solib_catchpoints
);
3105 stop_print_frame
= 1;
3106 stop_stepping (ecs
);
3110 if (ecs
->event_thread
->step_resume_breakpoint
)
3113 fprintf_unfiltered (gdb_stdlog
,
3114 "infrun: step-resume breakpoint is inserted\n");
3116 /* Having a step-resume breakpoint overrides anything
3117 else having to do with stepping commands until
3118 that breakpoint is reached. */
3123 if (ecs
->event_thread
->step_range_end
== 0)
3126 fprintf_unfiltered (gdb_stdlog
, "infrun: no stepping, continue\n");
3127 /* Likewise if we aren't even stepping. */
3132 /* If stepping through a line, keep going if still within it.
3134 Note that step_range_end is the address of the first instruction
3135 beyond the step range, and NOT the address of the last instruction
3137 if (stop_pc
>= ecs
->event_thread
->step_range_start
3138 && stop_pc
< ecs
->event_thread
->step_range_end
)
3141 fprintf_unfiltered (gdb_stdlog
, "infrun: stepping inside range [0x%s-0x%s]\n",
3142 paddr_nz (ecs
->event_thread
->step_range_start
),
3143 paddr_nz (ecs
->event_thread
->step_range_end
));
3145 /* When stepping backward, stop at beginning of line range
3146 (unless it's the function entry point, in which case
3147 keep going back to the call point). */
3148 if (stop_pc
== ecs
->event_thread
->step_range_start
3149 && stop_pc
!= ecs
->stop_func_start
3150 && execution_direction
== EXEC_REVERSE
)
3152 ecs
->event_thread
->stop_step
= 1;
3153 print_stop_reason (END_STEPPING_RANGE
, 0);
3154 stop_stepping (ecs
);
3162 /* We stepped out of the stepping range. */
3164 /* If we are stepping at the source level and entered the runtime
3165 loader dynamic symbol resolution code, we keep on single stepping
3166 until we exit the run time loader code and reach the callee's
3168 if (ecs
->event_thread
->step_over_calls
== STEP_OVER_UNDEBUGGABLE
3169 && in_solib_dynsym_resolve_code (stop_pc
))
3171 CORE_ADDR pc_after_resolver
=
3172 gdbarch_skip_solib_resolver (current_gdbarch
, stop_pc
);
3175 fprintf_unfiltered (gdb_stdlog
, "infrun: stepped into dynsym resolve code\n");
3177 if (pc_after_resolver
)
3179 /* Set up a step-resume breakpoint at the address
3180 indicated by SKIP_SOLIB_RESOLVER. */
3181 struct symtab_and_line sr_sal
;
3183 sr_sal
.pc
= pc_after_resolver
;
3185 insert_step_resume_breakpoint_at_sal (sr_sal
, null_frame_id
);
3192 if (ecs
->event_thread
->step_range_end
!= 1
3193 && (ecs
->event_thread
->step_over_calls
== STEP_OVER_UNDEBUGGABLE
3194 || ecs
->event_thread
->step_over_calls
== STEP_OVER_ALL
)
3195 && get_frame_type (get_current_frame ()) == SIGTRAMP_FRAME
)
3198 fprintf_unfiltered (gdb_stdlog
, "infrun: stepped into signal trampoline\n");
3199 /* The inferior, while doing a "step" or "next", has ended up in
3200 a signal trampoline (either by a signal being delivered or by
3201 the signal handler returning). Just single-step until the
3202 inferior leaves the trampoline (either by calling the handler
3208 /* Check for subroutine calls. The check for the current frame
3209 equalling the step ID is not necessary - the check of the
3210 previous frame's ID is sufficient - but it is a common case and
3211 cheaper than checking the previous frame's ID.
3213 NOTE: frame_id_eq will never report two invalid frame IDs as
3214 being equal, so to get into this block, both the current and
3215 previous frame must have valid frame IDs. */
3216 if (!frame_id_eq (get_frame_id (get_current_frame ()),
3217 ecs
->event_thread
->step_frame_id
)
3218 && (frame_id_eq (frame_unwind_id (get_current_frame ()),
3219 ecs
->event_thread
->step_frame_id
)
3220 || execution_direction
== EXEC_REVERSE
))
3222 CORE_ADDR real_stop_pc
;
3225 fprintf_unfiltered (gdb_stdlog
, "infrun: stepped into subroutine\n");
3227 if ((ecs
->event_thread
->step_over_calls
== STEP_OVER_NONE
)
3228 || ((ecs
->event_thread
->step_range_end
== 1)
3229 && in_prologue (ecs
->event_thread
->prev_pc
,
3230 ecs
->stop_func_start
)))
3232 /* I presume that step_over_calls is only 0 when we're
3233 supposed to be stepping at the assembly language level
3234 ("stepi"). Just stop. */
3235 /* Also, maybe we just did a "nexti" inside a prolog, so we
3236 thought it was a subroutine call but it was not. Stop as
3238 ecs
->event_thread
->stop_step
= 1;
3239 print_stop_reason (END_STEPPING_RANGE
, 0);
3240 stop_stepping (ecs
);
3244 if (ecs
->event_thread
->step_over_calls
== STEP_OVER_ALL
)
3246 /* We're doing a "next".
3248 Normal (forward) execution: set a breakpoint at the
3249 callee's return address (the address at which the caller
3252 Reverse (backward) execution. set the step-resume
3253 breakpoint at the start of the function that we just
3254 stepped into (backwards), and continue to there. When we
3255 get there, we'll need to single-step back to the
3258 if (execution_direction
== EXEC_REVERSE
)
3260 struct symtab_and_line sr_sal
;
3262 sr_sal
.pc
= ecs
->stop_func_start
;
3263 insert_step_resume_breakpoint_at_sal (sr_sal
, null_frame_id
);
3266 insert_step_resume_breakpoint_at_caller (get_current_frame ());
3272 /* If we are in a function call trampoline (a stub between the
3273 calling routine and the real function), locate the real
3274 function. That's what tells us (a) whether we want to step
3275 into it at all, and (b) what prologue we want to run to the
3276 end of, if we do step into it. */
3277 real_stop_pc
= skip_language_trampoline (get_current_frame (), stop_pc
);
3278 if (real_stop_pc
== 0)
3279 real_stop_pc
= gdbarch_skip_trampoline_code
3280 (current_gdbarch
, get_current_frame (), stop_pc
);
3281 if (real_stop_pc
!= 0)
3282 ecs
->stop_func_start
= real_stop_pc
;
3284 if (real_stop_pc
!= 0 && in_solib_dynsym_resolve_code (real_stop_pc
))
3286 struct symtab_and_line sr_sal
;
3288 sr_sal
.pc
= ecs
->stop_func_start
;
3290 insert_step_resume_breakpoint_at_sal (sr_sal
, null_frame_id
);
3295 /* If we have line number information for the function we are
3296 thinking of stepping into, step into it.
3298 If there are several symtabs at that PC (e.g. with include
3299 files), just want to know whether *any* of them have line
3300 numbers. find_pc_line handles this. */
3302 struct symtab_and_line tmp_sal
;
3304 tmp_sal
= find_pc_line (ecs
->stop_func_start
, 0);
3305 if (tmp_sal
.line
!= 0)
3307 if (execution_direction
== EXEC_REVERSE
)
3308 handle_step_into_function_backward (ecs
);
3310 handle_step_into_function (ecs
);
3315 /* If we have no line number and the step-stop-if-no-debug is
3316 set, we stop the step so that the user has a chance to switch
3317 in assembly mode. */
3318 if (ecs
->event_thread
->step_over_calls
== STEP_OVER_UNDEBUGGABLE
3319 && step_stop_if_no_debug
)
3321 ecs
->event_thread
->stop_step
= 1;
3322 print_stop_reason (END_STEPPING_RANGE
, 0);
3323 stop_stepping (ecs
);
3327 if (execution_direction
== EXEC_REVERSE
)
3329 /* Set a breakpoint at callee's start address.
3330 From there we can step once and be back in the caller. */
3331 struct symtab_and_line sr_sal
;
3333 sr_sal
.pc
= ecs
->stop_func_start
;
3334 insert_step_resume_breakpoint_at_sal (sr_sal
, null_frame_id
);
3337 /* Set a breakpoint at callee's return address (the address
3338 at which the caller will resume). */
3339 insert_step_resume_breakpoint_at_caller (get_current_frame ());
3345 /* If we're in the return path from a shared library trampoline,
3346 we want to proceed through the trampoline when stepping. */
3347 if (gdbarch_in_solib_return_trampoline (current_gdbarch
,
3348 stop_pc
, ecs
->stop_func_name
))
3350 /* Determine where this trampoline returns. */
3351 CORE_ADDR real_stop_pc
;
3352 real_stop_pc
= gdbarch_skip_trampoline_code
3353 (current_gdbarch
, get_current_frame (), stop_pc
);
3356 fprintf_unfiltered (gdb_stdlog
, "infrun: stepped into solib return tramp\n");
3358 /* Only proceed through if we know where it's going. */
3361 /* And put the step-breakpoint there and go until there. */
3362 struct symtab_and_line sr_sal
;
3364 init_sal (&sr_sal
); /* initialize to zeroes */
3365 sr_sal
.pc
= real_stop_pc
;
3366 sr_sal
.section
= find_pc_overlay (sr_sal
.pc
);
3368 /* Do not specify what the fp should be when we stop since
3369 on some machines the prologue is where the new fp value
3371 insert_step_resume_breakpoint_at_sal (sr_sal
, null_frame_id
);
3373 /* Restart without fiddling with the step ranges or
3380 stop_pc_sal
= find_pc_line (stop_pc
, 0);
3382 /* NOTE: tausq/2004-05-24: This if block used to be done before all
3383 the trampoline processing logic, however, there are some trampolines
3384 that have no names, so we should do trampoline handling first. */
3385 if (ecs
->event_thread
->step_over_calls
== STEP_OVER_UNDEBUGGABLE
3386 && ecs
->stop_func_name
== NULL
3387 && stop_pc_sal
.line
== 0)
3390 fprintf_unfiltered (gdb_stdlog
, "infrun: stepped into undebuggable function\n");
3392 /* The inferior just stepped into, or returned to, an
3393 undebuggable function (where there is no debugging information
3394 and no line number corresponding to the address where the
3395 inferior stopped). Since we want to skip this kind of code,
3396 we keep going until the inferior returns from this
3397 function - unless the user has asked us not to (via
3398 set step-mode) or we no longer know how to get back
3399 to the call site. */
3400 if (step_stop_if_no_debug
3401 || !frame_id_p (frame_unwind_id (get_current_frame ())))
3403 /* If we have no line number and the step-stop-if-no-debug
3404 is set, we stop the step so that the user has a chance to
3405 switch in assembly mode. */
3406 ecs
->event_thread
->stop_step
= 1;
3407 print_stop_reason (END_STEPPING_RANGE
, 0);
3408 stop_stepping (ecs
);
3413 /* Set a breakpoint at callee's return address (the address
3414 at which the caller will resume). */
3415 insert_step_resume_breakpoint_at_caller (get_current_frame ());
3421 if (ecs
->event_thread
->step_range_end
== 1)
3423 /* It is stepi or nexti. We always want to stop stepping after
3426 fprintf_unfiltered (gdb_stdlog
, "infrun: stepi/nexti\n");
3427 ecs
->event_thread
->stop_step
= 1;
3428 print_stop_reason (END_STEPPING_RANGE
, 0);
3429 stop_stepping (ecs
);
3433 if (stop_pc_sal
.line
== 0)
3435 /* We have no line number information. That means to stop
3436 stepping (does this always happen right after one instruction,
3437 when we do "s" in a function with no line numbers,
3438 or can this happen as a result of a return or longjmp?). */
3440 fprintf_unfiltered (gdb_stdlog
, "infrun: no line number info\n");
3441 ecs
->event_thread
->stop_step
= 1;
3442 print_stop_reason (END_STEPPING_RANGE
, 0);
3443 stop_stepping (ecs
);
3447 if ((stop_pc
== stop_pc_sal
.pc
)
3448 && (ecs
->event_thread
->current_line
!= stop_pc_sal
.line
3449 || ecs
->event_thread
->current_symtab
!= stop_pc_sal
.symtab
))
3451 /* We are at the start of a different line. So stop. Note that
3452 we don't stop if we step into the middle of a different line.
3453 That is said to make things like for (;;) statements work
3456 fprintf_unfiltered (gdb_stdlog
, "infrun: stepped to a different line\n");
3457 ecs
->event_thread
->stop_step
= 1;
3458 print_stop_reason (END_STEPPING_RANGE
, 0);
3459 stop_stepping (ecs
);
3463 /* We aren't done stepping.
3465 Optimize by setting the stepping range to the line.
3466 (We might not be in the original line, but if we entered a
3467 new line in mid-statement, we continue stepping. This makes
3468 things like for(;;) statements work better.) */
3470 ecs
->event_thread
->step_range_start
= stop_pc_sal
.pc
;
3471 ecs
->event_thread
->step_range_end
= stop_pc_sal
.end
;
3472 ecs
->event_thread
->step_frame_id
= get_frame_id (get_current_frame ());
3473 ecs
->event_thread
->current_line
= stop_pc_sal
.line
;
3474 ecs
->event_thread
->current_symtab
= stop_pc_sal
.symtab
;
3477 fprintf_unfiltered (gdb_stdlog
, "infrun: keep going\n");
3481 /* Are we in the middle of stepping? */
3484 currently_stepping (struct thread_info
*tp
)
3486 return (((tp
->step_range_end
&& tp
->step_resume_breakpoint
== NULL
)
3487 || tp
->trap_expected
)
3488 || tp
->stepping_through_solib_after_catch
3489 || bpstat_should_step ());
3492 /* Inferior has stepped into a subroutine call with source code that
3493 we should not step over. Do step to the first line of code in
3497 handle_step_into_function (struct execution_control_state
*ecs
)
3500 struct symtab_and_line stop_func_sal
, sr_sal
;
3502 s
= find_pc_symtab (stop_pc
);
3503 if (s
&& s
->language
!= language_asm
)
3504 ecs
->stop_func_start
= gdbarch_skip_prologue (current_gdbarch
,
3505 ecs
->stop_func_start
);
3507 stop_func_sal
= find_pc_line (ecs
->stop_func_start
, 0);
3508 /* Use the step_resume_break to step until the end of the prologue,
3509 even if that involves jumps (as it seems to on the vax under
3511 /* If the prologue ends in the middle of a source line, continue to
3512 the end of that source line (if it is still within the function).
3513 Otherwise, just go to end of prologue. */
3514 if (stop_func_sal
.end
3515 && stop_func_sal
.pc
!= ecs
->stop_func_start
3516 && stop_func_sal
.end
< ecs
->stop_func_end
)
3517 ecs
->stop_func_start
= stop_func_sal
.end
;
3519 /* Architectures which require breakpoint adjustment might not be able
3520 to place a breakpoint at the computed address. If so, the test
3521 ``ecs->stop_func_start == stop_pc'' will never succeed. Adjust
3522 ecs->stop_func_start to an address at which a breakpoint may be
3523 legitimately placed.
3525 Note: kevinb/2004-01-19: On FR-V, if this adjustment is not
3526 made, GDB will enter an infinite loop when stepping through
3527 optimized code consisting of VLIW instructions which contain
3528 subinstructions corresponding to different source lines. On
3529 FR-V, it's not permitted to place a breakpoint on any but the
3530 first subinstruction of a VLIW instruction. When a breakpoint is
3531 set, GDB will adjust the breakpoint address to the beginning of
3532 the VLIW instruction. Thus, we need to make the corresponding
3533 adjustment here when computing the stop address. */
3535 if (gdbarch_adjust_breakpoint_address_p (current_gdbarch
))
3537 ecs
->stop_func_start
3538 = gdbarch_adjust_breakpoint_address (current_gdbarch
,
3539 ecs
->stop_func_start
);
3542 if (ecs
->stop_func_start
== stop_pc
)
3544 /* We are already there: stop now. */
3545 ecs
->event_thread
->stop_step
= 1;
3546 print_stop_reason (END_STEPPING_RANGE
, 0);
3547 stop_stepping (ecs
);
3552 /* Put the step-breakpoint there and go until there. */
3553 init_sal (&sr_sal
); /* initialize to zeroes */
3554 sr_sal
.pc
= ecs
->stop_func_start
;
3555 sr_sal
.section
= find_pc_overlay (ecs
->stop_func_start
);
3557 /* Do not specify what the fp should be when we stop since on
3558 some machines the prologue is where the new fp value is
3560 insert_step_resume_breakpoint_at_sal (sr_sal
, null_frame_id
);
3562 /* And make sure stepping stops right away then. */
3563 ecs
->event_thread
->step_range_end
= ecs
->event_thread
->step_range_start
;
3568 /* Inferior has stepped backward into a subroutine call with source
3569 code that we should not step over. Do step to the beginning of the
3570 last line of code in it. */
3573 handle_step_into_function_backward (struct execution_control_state
*ecs
)
3576 struct symtab_and_line stop_func_sal
, sr_sal
;
3578 s
= find_pc_symtab (stop_pc
);
3579 if (s
&& s
->language
!= language_asm
)
3580 ecs
->stop_func_start
= gdbarch_skip_prologue (current_gdbarch
,
3581 ecs
->stop_func_start
);
3583 stop_func_sal
= find_pc_line (stop_pc
, 0);
3585 /* OK, we're just going to keep stepping here. */
3586 if (stop_func_sal
.pc
== stop_pc
)
3588 /* We're there already. Just stop stepping now. */
3589 ecs
->event_thread
->stop_step
= 1;
3590 print_stop_reason (END_STEPPING_RANGE
, 0);
3591 stop_stepping (ecs
);
3595 /* Else just reset the step range and keep going.
3596 No step-resume breakpoint, they don't work for
3597 epilogues, which can have multiple entry paths. */
3598 ecs
->event_thread
->step_range_start
= stop_func_sal
.pc
;
3599 ecs
->event_thread
->step_range_end
= stop_func_sal
.end
;
3605 /* Insert a "step-resume breakpoint" at SR_SAL with frame ID SR_ID.
3606 This is used to both functions and to skip over code. */
3609 insert_step_resume_breakpoint_at_sal (struct symtab_and_line sr_sal
,
3610 struct frame_id sr_id
)
3612 /* There should never be more than one step-resume or longjmp-resume
3613 breakpoint per thread, so we should never be setting a new
3614 step_resume_breakpoint when one is already active. */
3615 gdb_assert (inferior_thread ()->step_resume_breakpoint
== NULL
);
3618 fprintf_unfiltered (gdb_stdlog
,
3619 "infrun: inserting step-resume breakpoint at 0x%s\n",
3620 paddr_nz (sr_sal
.pc
));
3622 inferior_thread ()->step_resume_breakpoint
3623 = set_momentary_breakpoint (sr_sal
, sr_id
, bp_step_resume
);
3626 /* Insert a "step-resume breakpoint" at RETURN_FRAME.pc. This is used
3627 to skip a potential signal handler.
3629 This is called with the interrupted function's frame. The signal
3630 handler, when it returns, will resume the interrupted function at
3634 insert_step_resume_breakpoint_at_frame (struct frame_info
*return_frame
)
3636 struct symtab_and_line sr_sal
;
3638 gdb_assert (return_frame
!= NULL
);
3639 init_sal (&sr_sal
); /* initialize to zeros */
3641 sr_sal
.pc
= gdbarch_addr_bits_remove
3642 (current_gdbarch
, get_frame_pc (return_frame
));
3643 sr_sal
.section
= find_pc_overlay (sr_sal
.pc
);
3645 insert_step_resume_breakpoint_at_sal (sr_sal
, get_frame_id (return_frame
));
3648 /* Similar to insert_step_resume_breakpoint_at_frame, except
3649 but a breakpoint at the previous frame's PC. This is used to
3650 skip a function after stepping into it (for "next" or if the called
3651 function has no debugging information).
3653 The current function has almost always been reached by single
3654 stepping a call or return instruction. NEXT_FRAME belongs to the
3655 current function, and the breakpoint will be set at the caller's
3658 This is a separate function rather than reusing
3659 insert_step_resume_breakpoint_at_frame in order to avoid
3660 get_prev_frame, which may stop prematurely (see the implementation
3661 of frame_unwind_id for an example). */
3664 insert_step_resume_breakpoint_at_caller (struct frame_info
*next_frame
)
3666 struct symtab_and_line sr_sal
;
3668 /* We shouldn't have gotten here if we don't know where the call site
3670 gdb_assert (frame_id_p (frame_unwind_id (next_frame
)));
3672 init_sal (&sr_sal
); /* initialize to zeros */
3674 sr_sal
.pc
= gdbarch_addr_bits_remove
3675 (current_gdbarch
, frame_pc_unwind (next_frame
));
3676 sr_sal
.section
= find_pc_overlay (sr_sal
.pc
);
3678 insert_step_resume_breakpoint_at_sal (sr_sal
, frame_unwind_id (next_frame
));
3681 /* Insert a "longjmp-resume" breakpoint at PC. This is used to set a
3682 new breakpoint at the target of a jmp_buf. The handling of
3683 longjmp-resume uses the same mechanisms used for handling
3684 "step-resume" breakpoints. */
3687 insert_longjmp_resume_breakpoint (CORE_ADDR pc
)
3689 /* There should never be more than one step-resume or longjmp-resume
3690 breakpoint per thread, so we should never be setting a new
3691 longjmp_resume_breakpoint when one is already active. */
3692 gdb_assert (inferior_thread ()->step_resume_breakpoint
== NULL
);
3695 fprintf_unfiltered (gdb_stdlog
,
3696 "infrun: inserting longjmp-resume breakpoint at 0x%s\n",
3699 inferior_thread ()->step_resume_breakpoint
=
3700 set_momentary_breakpoint_at_pc (pc
, bp_longjmp_resume
);
3704 stop_stepping (struct execution_control_state
*ecs
)
3707 fprintf_unfiltered (gdb_stdlog
, "infrun: stop_stepping\n");
3709 /* Let callers know we don't want to wait for the inferior anymore. */
3710 ecs
->wait_some_more
= 0;
3713 /* This function handles various cases where we need to continue
3714 waiting for the inferior. */
3715 /* (Used to be the keep_going: label in the old wait_for_inferior) */
3718 keep_going (struct execution_control_state
*ecs
)
3720 /* Save the pc before execution, to compare with pc after stop. */
3721 ecs
->event_thread
->prev_pc
= read_pc (); /* Might have been DECR_AFTER_BREAK */
3723 /* If we did not do break;, it means we should keep running the
3724 inferior and not return to debugger. */
3726 if (ecs
->event_thread
->trap_expected
3727 && ecs
->event_thread
->stop_signal
!= TARGET_SIGNAL_TRAP
)
3729 /* We took a signal (which we are supposed to pass through to
3730 the inferior, else we'd not get here) and we haven't yet
3731 gotten our trap. Simply continue. */
3732 resume (currently_stepping (ecs
->event_thread
),
3733 ecs
->event_thread
->stop_signal
);
3737 /* Either the trap was not expected, but we are continuing
3738 anyway (the user asked that this signal be passed to the
3741 The signal was SIGTRAP, e.g. it was our signal, but we
3742 decided we should resume from it.
3744 We're going to run this baby now!
3746 Note that insert_breakpoints won't try to re-insert
3747 already inserted breakpoints. Therefore, we don't
3748 care if breakpoints were already inserted, or not. */
3750 if (ecs
->event_thread
->stepping_over_breakpoint
)
3752 if (! use_displaced_stepping (current_gdbarch
))
3753 /* Since we can't do a displaced step, we have to remove
3754 the breakpoint while we step it. To keep things
3755 simple, we remove them all. */
3756 remove_breakpoints ();
3760 struct gdb_exception e
;
3761 /* Stop stepping when inserting breakpoints
3763 TRY_CATCH (e
, RETURN_MASK_ERROR
)
3765 insert_breakpoints ();
3769 stop_stepping (ecs
);
3774 ecs
->event_thread
->trap_expected
= ecs
->event_thread
->stepping_over_breakpoint
;
3776 /* Do not deliver SIGNAL_TRAP (except when the user explicitly
3777 specifies that such a signal should be delivered to the
3780 Typically, this would occure when a user is debugging a
3781 target monitor on a simulator: the target monitor sets a
3782 breakpoint; the simulator encounters this break-point and
3783 halts the simulation handing control to GDB; GDB, noteing
3784 that the break-point isn't valid, returns control back to the
3785 simulator; the simulator then delivers the hardware
3786 equivalent of a SIGNAL_TRAP to the program being debugged. */
3788 if (ecs
->event_thread
->stop_signal
== TARGET_SIGNAL_TRAP
3789 && !signal_program
[ecs
->event_thread
->stop_signal
])
3790 ecs
->event_thread
->stop_signal
= TARGET_SIGNAL_0
;
3792 resume (currently_stepping (ecs
->event_thread
),
3793 ecs
->event_thread
->stop_signal
);
3796 prepare_to_wait (ecs
);
3799 /* This function normally comes after a resume, before
3800 handle_inferior_event exits. It takes care of any last bits of
3801 housekeeping, and sets the all-important wait_some_more flag. */
3804 prepare_to_wait (struct execution_control_state
*ecs
)
3807 fprintf_unfiltered (gdb_stdlog
, "infrun: prepare_to_wait\n");
3808 if (infwait_state
== infwait_normal_state
)
3810 overlay_cache_invalid
= 1;
3812 /* We have to invalidate the registers BEFORE calling
3813 target_wait because they can be loaded from the target while
3814 in target_wait. This makes remote debugging a bit more
3815 efficient for those targets that provide critical registers
3816 as part of their normal status mechanism. */
3818 registers_changed ();
3819 waiton_ptid
= pid_to_ptid (-1);
3821 /* This is the old end of the while loop. Let everybody know we
3822 want to wait for the inferior some more and get called again
3824 ecs
->wait_some_more
= 1;
3827 /* Print why the inferior has stopped. We always print something when
3828 the inferior exits, or receives a signal. The rest of the cases are
3829 dealt with later on in normal_stop() and print_it_typical(). Ideally
3830 there should be a call to this function from handle_inferior_event()
3831 each time stop_stepping() is called.*/
3833 print_stop_reason (enum inferior_stop_reason stop_reason
, int stop_info
)
3835 switch (stop_reason
)
3837 case END_STEPPING_RANGE
:
3838 /* We are done with a step/next/si/ni command. */
3839 /* For now print nothing. */
3840 /* Print a message only if not in the middle of doing a "step n"
3841 operation for n > 1 */
3842 if (!inferior_thread ()->step_multi
3843 || !inferior_thread ()->stop_step
)
3844 if (ui_out_is_mi_like_p (uiout
))
3847 async_reason_lookup (EXEC_ASYNC_END_STEPPING_RANGE
));
3850 /* The inferior was terminated by a signal. */
3851 annotate_signalled ();
3852 if (ui_out_is_mi_like_p (uiout
))
3855 async_reason_lookup (EXEC_ASYNC_EXITED_SIGNALLED
));
3856 ui_out_text (uiout
, "\nProgram terminated with signal ");
3857 annotate_signal_name ();
3858 ui_out_field_string (uiout
, "signal-name",
3859 target_signal_to_name (stop_info
));
3860 annotate_signal_name_end ();
3861 ui_out_text (uiout
, ", ");
3862 annotate_signal_string ();
3863 ui_out_field_string (uiout
, "signal-meaning",
3864 target_signal_to_string (stop_info
));
3865 annotate_signal_string_end ();
3866 ui_out_text (uiout
, ".\n");
3867 ui_out_text (uiout
, "The program no longer exists.\n");
3870 /* The inferior program is finished. */
3871 annotate_exited (stop_info
);
3874 if (ui_out_is_mi_like_p (uiout
))
3875 ui_out_field_string (uiout
, "reason",
3876 async_reason_lookup (EXEC_ASYNC_EXITED
));
3877 ui_out_text (uiout
, "\nProgram exited with code ");
3878 ui_out_field_fmt (uiout
, "exit-code", "0%o",
3879 (unsigned int) stop_info
);
3880 ui_out_text (uiout
, ".\n");
3884 if (ui_out_is_mi_like_p (uiout
))
3887 async_reason_lookup (EXEC_ASYNC_EXITED_NORMALLY
));
3888 ui_out_text (uiout
, "\nProgram exited normally.\n");
3890 /* Support the --return-child-result option. */
3891 return_child_result_value
= stop_info
;
3893 case SIGNAL_RECEIVED
:
3894 /* Signal received. The signal table tells us to print about
3897 ui_out_text (uiout
, "\nProgram received signal ");
3898 annotate_signal_name ();
3899 if (ui_out_is_mi_like_p (uiout
))
3901 (uiout
, "reason", async_reason_lookup (EXEC_ASYNC_SIGNAL_RECEIVED
));
3902 ui_out_field_string (uiout
, "signal-name",
3903 target_signal_to_name (stop_info
));
3904 annotate_signal_name_end ();
3905 ui_out_text (uiout
, ", ");
3906 annotate_signal_string ();
3907 ui_out_field_string (uiout
, "signal-meaning",
3908 target_signal_to_string (stop_info
));
3909 annotate_signal_string_end ();
3910 ui_out_text (uiout
, ".\n");
3913 /* Reverse execution: target ran out of history info. */
3914 ui_out_text (uiout
, "\nNo more reverse-execution history.\n");
3917 internal_error (__FILE__
, __LINE__
,
3918 _("print_stop_reason: unrecognized enum value"));
3924 /* Here to return control to GDB when the inferior stops for real.
3925 Print appropriate messages, remove breakpoints, give terminal our modes.
3927 STOP_PRINT_FRAME nonzero means print the executing frame
3928 (pc, function, args, file, line number and line text).
3929 BREAKPOINTS_FAILED nonzero means stop was due to error
3930 attempting to insert breakpoints. */
3935 struct target_waitstatus last
;
3938 get_last_target_status (&last_ptid
, &last
);
3940 /* In non-stop mode, we don't want GDB to switch threads behind the
3941 user's back, to avoid races where the user is typing a command to
3942 apply to thread x, but GDB switches to thread y before the user
3943 finishes entering the command. */
3945 /* As with the notification of thread events, we want to delay
3946 notifying the user that we've switched thread context until
3947 the inferior actually stops.
3949 There's no point in saying anything if the inferior has exited.
3950 Note that SIGNALLED here means "exited with a signal", not
3951 "received a signal". */
3953 && !ptid_equal (previous_inferior_ptid
, inferior_ptid
)
3954 && target_has_execution
3955 && last
.kind
!= TARGET_WAITKIND_SIGNALLED
3956 && last
.kind
!= TARGET_WAITKIND_EXITED
)
3958 target_terminal_ours_for_output ();
3959 printf_filtered (_("[Switching to %s]\n"),
3960 target_pid_to_str (inferior_ptid
));
3961 annotate_thread_changed ();
3962 previous_inferior_ptid
= inferior_ptid
;
3965 /* NOTE drow/2004-01-17: Is this still necessary? */
3966 /* Make sure that the current_frame's pc is correct. This
3967 is a correction for setting up the frame info before doing
3968 gdbarch_decr_pc_after_break */
3969 if (target_has_execution
)
3970 /* FIXME: cagney/2002-12-06: Has the PC changed? Thanks to
3971 gdbarch_decr_pc_after_break, the program counter can change. Ask the
3972 frame code to check for this and sort out any resultant mess.
3973 gdbarch_decr_pc_after_break needs to just go away. */
3974 deprecated_update_frame_pc_hack (get_current_frame (), read_pc ());
3976 if (!breakpoints_always_inserted_mode () && target_has_execution
)
3978 if (remove_breakpoints ())
3980 target_terminal_ours_for_output ();
3981 printf_filtered (_("\
3982 Cannot remove breakpoints because program is no longer writable.\n\
3983 It might be running in another process.\n\
3984 Further execution is probably impossible.\n"));
3988 /* If an auto-display called a function and that got a signal,
3989 delete that auto-display to avoid an infinite recursion. */
3991 if (stopped_by_random_signal
)
3992 disable_current_display ();
3994 /* Don't print a message if in the middle of doing a "step n"
3995 operation for n > 1 */
3996 if (target_has_execution
3997 && last
.kind
!= TARGET_WAITKIND_SIGNALLED
3998 && last
.kind
!= TARGET_WAITKIND_EXITED
3999 && inferior_thread ()->step_multi
4000 && inferior_thread ()->stop_step
)
4003 target_terminal_ours ();
4005 /* Set the current source location. This will also happen if we
4006 display the frame below, but the current SAL will be incorrect
4007 during a user hook-stop function. */
4008 if (target_has_stack
&& !stop_stack_dummy
)
4009 set_current_sal_from_frame (get_current_frame (), 1);
4011 if (!target_has_stack
)
4014 if (last
.kind
== TARGET_WAITKIND_SIGNALLED
4015 || last
.kind
== TARGET_WAITKIND_EXITED
)
4018 /* Select innermost stack frame - i.e., current frame is frame 0,
4019 and current location is based on that.
4020 Don't do this on return from a stack dummy routine,
4021 or if the program has exited. */
4023 if (!stop_stack_dummy
)
4025 select_frame (get_current_frame ());
4027 /* Print current location without a level number, if
4028 we have changed functions or hit a breakpoint.
4029 Print source line if we have one.
4030 bpstat_print() contains the logic deciding in detail
4031 what to print, based on the event(s) that just occurred. */
4033 /* If --batch-silent is enabled then there's no need to print the current
4034 source location, and to try risks causing an error message about
4035 missing source files. */
4036 if (stop_print_frame
&& !batch_silent
)
4040 int do_frame_printing
= 1;
4041 struct thread_info
*tp
= inferior_thread ();
4043 bpstat_ret
= bpstat_print (tp
->stop_bpstat
);
4047 /* If we had hit a shared library event breakpoint,
4048 bpstat_print would print out this message. If we hit
4049 an OS-level shared library event, do the same
4051 if (last
.kind
== TARGET_WAITKIND_LOADED
)
4053 printf_filtered (_("Stopped due to shared library event\n"));
4054 source_flag
= SRC_LINE
; /* something bogus */
4055 do_frame_printing
= 0;
4059 /* FIXME: cagney/2002-12-01: Given that a frame ID does
4060 (or should) carry around the function and does (or
4061 should) use that when doing a frame comparison. */
4063 && frame_id_eq (tp
->step_frame_id
,
4064 get_frame_id (get_current_frame ()))
4065 && step_start_function
== find_pc_function (stop_pc
))
4066 source_flag
= SRC_LINE
; /* finished step, just print source line */
4068 source_flag
= SRC_AND_LOC
; /* print location and source line */
4070 case PRINT_SRC_AND_LOC
:
4071 source_flag
= SRC_AND_LOC
; /* print location and source line */
4073 case PRINT_SRC_ONLY
:
4074 source_flag
= SRC_LINE
;
4077 source_flag
= SRC_LINE
; /* something bogus */
4078 do_frame_printing
= 0;
4081 internal_error (__FILE__
, __LINE__
, _("Unknown value."));
4084 if (ui_out_is_mi_like_p (uiout
))
4087 ui_out_field_int (uiout
, "thread-id",
4088 pid_to_thread_id (inferior_ptid
));
4091 struct cleanup
*back_to
= make_cleanup_ui_out_list_begin_end
4092 (uiout
, "stopped-threads");
4093 ui_out_field_int (uiout
, NULL
,
4094 pid_to_thread_id (inferior_ptid
));
4095 do_cleanups (back_to
);
4098 ui_out_field_string (uiout
, "stopped-threads", "all");
4100 /* The behavior of this routine with respect to the source
4102 SRC_LINE: Print only source line
4103 LOCATION: Print only location
4104 SRC_AND_LOC: Print location and source line */
4105 if (do_frame_printing
)
4106 print_stack_frame (get_selected_frame (NULL
), 0, source_flag
);
4108 /* Display the auto-display expressions. */
4113 /* Save the function value return registers, if we care.
4114 We might be about to restore their previous contents. */
4115 if (inferior_thread ()->proceed_to_finish
)
4117 /* This should not be necessary. */
4119 regcache_xfree (stop_registers
);
4121 /* NB: The copy goes through to the target picking up the value of
4122 all the registers. */
4123 stop_registers
= regcache_dup (get_current_regcache ());
4126 if (stop_stack_dummy
)
4128 /* Pop the empty frame that contains the stack dummy. POP_FRAME
4129 ends with a setting of the current frame, so we can use that
4131 frame_pop (get_current_frame ());
4132 /* Set stop_pc to what it was before we called the function.
4133 Can't rely on restore_inferior_status because that only gets
4134 called if we don't stop in the called function. */
4135 stop_pc
= read_pc ();
4136 select_frame (get_current_frame ());
4140 annotate_stopped ();
4141 if (!suppress_stop_observer
4142 && !(target_has_execution
4143 && last
.kind
!= TARGET_WAITKIND_SIGNALLED
4144 && last
.kind
!= TARGET_WAITKIND_EXITED
4145 && inferior_thread ()->step_multi
))
4147 if (!ptid_equal (inferior_ptid
, null_ptid
))
4148 observer_notify_normal_stop (inferior_thread ()->stop_bpstat
);
4150 observer_notify_normal_stop (NULL
);
4152 if (target_has_execution
4153 && last
.kind
!= TARGET_WAITKIND_SIGNALLED
4154 && last
.kind
!= TARGET_WAITKIND_EXITED
)
4156 /* Delete the breakpoint we stopped at, if it wants to be deleted.
4157 Delete any breakpoint that is to be deleted at the next stop. */
4158 breakpoint_auto_delete (inferior_thread ()->stop_bpstat
);
4161 set_running (pid_to_ptid (-1), 0);
4163 set_running (inferior_ptid
, 0);
4166 /* Look up the hook_stop and run it (CLI internally handles problem
4167 of stop_command's pre-hook not existing). */
4169 catch_errors (hook_stop_stub
, stop_command
,
4170 "Error while running hook_stop:\n", RETURN_MASK_ALL
);
4175 hook_stop_stub (void *cmd
)
4177 execute_cmd_pre_hook ((struct cmd_list_element
*) cmd
);
4182 signal_stop_state (int signo
)
4184 return signal_stop
[signo
];
4188 signal_print_state (int signo
)
4190 return signal_print
[signo
];
4194 signal_pass_state (int signo
)
4196 return signal_program
[signo
];
4200 signal_stop_update (int signo
, int state
)
4202 int ret
= signal_stop
[signo
];
4203 signal_stop
[signo
] = state
;
4208 signal_print_update (int signo
, int state
)
4210 int ret
= signal_print
[signo
];
4211 signal_print
[signo
] = state
;
4216 signal_pass_update (int signo
, int state
)
4218 int ret
= signal_program
[signo
];
4219 signal_program
[signo
] = state
;
4224 sig_print_header (void)
4226 printf_filtered (_("\
4227 Signal Stop\tPrint\tPass to program\tDescription\n"));
4231 sig_print_info (enum target_signal oursig
)
4233 char *name
= target_signal_to_name (oursig
);
4234 int name_padding
= 13 - strlen (name
);
4236 if (name_padding
<= 0)
4239 printf_filtered ("%s", name
);
4240 printf_filtered ("%*.*s ", name_padding
, name_padding
, " ");
4241 printf_filtered ("%s\t", signal_stop
[oursig
] ? "Yes" : "No");
4242 printf_filtered ("%s\t", signal_print
[oursig
] ? "Yes" : "No");
4243 printf_filtered ("%s\t\t", signal_program
[oursig
] ? "Yes" : "No");
4244 printf_filtered ("%s\n", target_signal_to_string (oursig
));
4247 /* Specify how various signals in the inferior should be handled. */
4250 handle_command (char *args
, int from_tty
)
4253 int digits
, wordlen
;
4254 int sigfirst
, signum
, siglast
;
4255 enum target_signal oursig
;
4258 unsigned char *sigs
;
4259 struct cleanup
*old_chain
;
4263 error_no_arg (_("signal to handle"));
4266 /* Allocate and zero an array of flags for which signals to handle. */
4268 nsigs
= (int) TARGET_SIGNAL_LAST
;
4269 sigs
= (unsigned char *) alloca (nsigs
);
4270 memset (sigs
, 0, nsigs
);
4272 /* Break the command line up into args. */
4274 argv
= gdb_buildargv (args
);
4275 old_chain
= make_cleanup_freeargv (argv
);
4277 /* Walk through the args, looking for signal oursigs, signal names, and
4278 actions. Signal numbers and signal names may be interspersed with
4279 actions, with the actions being performed for all signals cumulatively
4280 specified. Signal ranges can be specified as <LOW>-<HIGH>. */
4282 while (*argv
!= NULL
)
4284 wordlen
= strlen (*argv
);
4285 for (digits
= 0; isdigit ((*argv
)[digits
]); digits
++)
4289 sigfirst
= siglast
= -1;
4291 if (wordlen
>= 1 && !strncmp (*argv
, "all", wordlen
))
4293 /* Apply action to all signals except those used by the
4294 debugger. Silently skip those. */
4297 siglast
= nsigs
- 1;
4299 else if (wordlen
>= 1 && !strncmp (*argv
, "stop", wordlen
))
4301 SET_SIGS (nsigs
, sigs
, signal_stop
);
4302 SET_SIGS (nsigs
, sigs
, signal_print
);
4304 else if (wordlen
>= 1 && !strncmp (*argv
, "ignore", wordlen
))
4306 UNSET_SIGS (nsigs
, sigs
, signal_program
);
4308 else if (wordlen
>= 2 && !strncmp (*argv
, "print", wordlen
))
4310 SET_SIGS (nsigs
, sigs
, signal_print
);
4312 else if (wordlen
>= 2 && !strncmp (*argv
, "pass", wordlen
))
4314 SET_SIGS (nsigs
, sigs
, signal_program
);
4316 else if (wordlen
>= 3 && !strncmp (*argv
, "nostop", wordlen
))
4318 UNSET_SIGS (nsigs
, sigs
, signal_stop
);
4320 else if (wordlen
>= 3 && !strncmp (*argv
, "noignore", wordlen
))
4322 SET_SIGS (nsigs
, sigs
, signal_program
);
4324 else if (wordlen
>= 4 && !strncmp (*argv
, "noprint", wordlen
))
4326 UNSET_SIGS (nsigs
, sigs
, signal_print
);
4327 UNSET_SIGS (nsigs
, sigs
, signal_stop
);
4329 else if (wordlen
>= 4 && !strncmp (*argv
, "nopass", wordlen
))
4331 UNSET_SIGS (nsigs
, sigs
, signal_program
);
4333 else if (digits
> 0)
4335 /* It is numeric. The numeric signal refers to our own
4336 internal signal numbering from target.h, not to host/target
4337 signal number. This is a feature; users really should be
4338 using symbolic names anyway, and the common ones like
4339 SIGHUP, SIGINT, SIGALRM, etc. will work right anyway. */
4341 sigfirst
= siglast
= (int)
4342 target_signal_from_command (atoi (*argv
));
4343 if ((*argv
)[digits
] == '-')
4346 target_signal_from_command (atoi ((*argv
) + digits
+ 1));
4348 if (sigfirst
> siglast
)
4350 /* Bet he didn't figure we'd think of this case... */
4358 oursig
= target_signal_from_name (*argv
);
4359 if (oursig
!= TARGET_SIGNAL_UNKNOWN
)
4361 sigfirst
= siglast
= (int) oursig
;
4365 /* Not a number and not a recognized flag word => complain. */
4366 error (_("Unrecognized or ambiguous flag word: \"%s\"."), *argv
);
4370 /* If any signal numbers or symbol names were found, set flags for
4371 which signals to apply actions to. */
4373 for (signum
= sigfirst
; signum
>= 0 && signum
<= siglast
; signum
++)
4375 switch ((enum target_signal
) signum
)
4377 case TARGET_SIGNAL_TRAP
:
4378 case TARGET_SIGNAL_INT
:
4379 if (!allsigs
&& !sigs
[signum
])
4381 if (query ("%s is used by the debugger.\n\
4382 Are you sure you want to change it? ", target_signal_to_name ((enum target_signal
) signum
)))
4388 printf_unfiltered (_("Not confirmed, unchanged.\n"));
4389 gdb_flush (gdb_stdout
);
4393 case TARGET_SIGNAL_0
:
4394 case TARGET_SIGNAL_DEFAULT
:
4395 case TARGET_SIGNAL_UNKNOWN
:
4396 /* Make sure that "all" doesn't print these. */
4407 target_notice_signals (inferior_ptid
);
4411 /* Show the results. */
4412 sig_print_header ();
4413 for (signum
= 0; signum
< nsigs
; signum
++)
4417 sig_print_info (signum
);
4422 do_cleanups (old_chain
);
4426 xdb_handle_command (char *args
, int from_tty
)
4429 struct cleanup
*old_chain
;
4432 error_no_arg (_("xdb command"));
4434 /* Break the command line up into args. */
4436 argv
= gdb_buildargv (args
);
4437 old_chain
= make_cleanup_freeargv (argv
);
4438 if (argv
[1] != (char *) NULL
)
4443 bufLen
= strlen (argv
[0]) + 20;
4444 argBuf
= (char *) xmalloc (bufLen
);
4448 enum target_signal oursig
;
4450 oursig
= target_signal_from_name (argv
[0]);
4451 memset (argBuf
, 0, bufLen
);
4452 if (strcmp (argv
[1], "Q") == 0)
4453 sprintf (argBuf
, "%s %s", argv
[0], "noprint");
4456 if (strcmp (argv
[1], "s") == 0)
4458 if (!signal_stop
[oursig
])
4459 sprintf (argBuf
, "%s %s", argv
[0], "stop");
4461 sprintf (argBuf
, "%s %s", argv
[0], "nostop");
4463 else if (strcmp (argv
[1], "i") == 0)
4465 if (!signal_program
[oursig
])
4466 sprintf (argBuf
, "%s %s", argv
[0], "pass");
4468 sprintf (argBuf
, "%s %s", argv
[0], "nopass");
4470 else if (strcmp (argv
[1], "r") == 0)
4472 if (!signal_print
[oursig
])
4473 sprintf (argBuf
, "%s %s", argv
[0], "print");
4475 sprintf (argBuf
, "%s %s", argv
[0], "noprint");
4481 handle_command (argBuf
, from_tty
);
4483 printf_filtered (_("Invalid signal handling flag.\n"));
4488 do_cleanups (old_chain
);
4491 /* Print current contents of the tables set by the handle command.
4492 It is possible we should just be printing signals actually used
4493 by the current target (but for things to work right when switching
4494 targets, all signals should be in the signal tables). */
4497 signals_info (char *signum_exp
, int from_tty
)
4499 enum target_signal oursig
;
4500 sig_print_header ();
4504 /* First see if this is a symbol name. */
4505 oursig
= target_signal_from_name (signum_exp
);
4506 if (oursig
== TARGET_SIGNAL_UNKNOWN
)
4508 /* No, try numeric. */
4510 target_signal_from_command (parse_and_eval_long (signum_exp
));
4512 sig_print_info (oursig
);
4516 printf_filtered ("\n");
4517 /* These ugly casts brought to you by the native VAX compiler. */
4518 for (oursig
= TARGET_SIGNAL_FIRST
;
4519 (int) oursig
< (int) TARGET_SIGNAL_LAST
;
4520 oursig
= (enum target_signal
) ((int) oursig
+ 1))
4524 if (oursig
!= TARGET_SIGNAL_UNKNOWN
4525 && oursig
!= TARGET_SIGNAL_DEFAULT
&& oursig
!= TARGET_SIGNAL_0
)
4526 sig_print_info (oursig
);
4529 printf_filtered (_("\nUse the \"handle\" command to change these tables.\n"));
4532 struct inferior_status
4534 enum target_signal stop_signal
;
4538 int stop_stack_dummy
;
4539 int stopped_by_random_signal
;
4540 int stepping_over_breakpoint
;
4541 CORE_ADDR step_range_start
;
4542 CORE_ADDR step_range_end
;
4543 struct frame_id step_frame_id
;
4544 enum step_over_calls_kind step_over_calls
;
4545 CORE_ADDR step_resume_break_address
;
4546 int stop_after_trap
;
4549 /* These are here because if call_function_by_hand has written some
4550 registers and then decides to call error(), we better not have changed
4552 struct regcache
*registers
;
4554 /* A frame unique identifier. */
4555 struct frame_id selected_frame_id
;
4557 int breakpoint_proceeded
;
4558 int restore_stack_info
;
4559 int proceed_to_finish
;
4563 write_inferior_status_register (struct inferior_status
*inf_status
, int regno
,
4566 int size
= register_size (current_gdbarch
, regno
);
4567 void *buf
= alloca (size
);
4568 store_signed_integer (buf
, size
, val
);
4569 regcache_raw_write (inf_status
->registers
, regno
, buf
);
4572 /* Save all of the information associated with the inferior<==>gdb
4573 connection. INF_STATUS is a pointer to a "struct inferior_status"
4574 (defined in inferior.h). */
4576 struct inferior_status
*
4577 save_inferior_status (int restore_stack_info
)
4579 struct inferior_status
*inf_status
= XMALLOC (struct inferior_status
);
4580 struct thread_info
*tp
= inferior_thread ();
4581 struct inferior
*inf
= current_inferior ();
4583 inf_status
->stop_signal
= tp
->stop_signal
;
4584 inf_status
->stop_pc
= stop_pc
;
4585 inf_status
->stop_step
= tp
->stop_step
;
4586 inf_status
->stop_stack_dummy
= stop_stack_dummy
;
4587 inf_status
->stopped_by_random_signal
= stopped_by_random_signal
;
4588 inf_status
->stepping_over_breakpoint
= tp
->trap_expected
;
4589 inf_status
->step_range_start
= tp
->step_range_start
;
4590 inf_status
->step_range_end
= tp
->step_range_end
;
4591 inf_status
->step_frame_id
= tp
->step_frame_id
;
4592 inf_status
->step_over_calls
= tp
->step_over_calls
;
4593 inf_status
->stop_after_trap
= stop_after_trap
;
4594 inf_status
->stop_soon
= inf
->stop_soon
;
4595 /* Save original bpstat chain here; replace it with copy of chain.
4596 If caller's caller is walking the chain, they'll be happier if we
4597 hand them back the original chain when restore_inferior_status is
4599 inf_status
->stop_bpstat
= tp
->stop_bpstat
;
4600 tp
->stop_bpstat
= bpstat_copy (tp
->stop_bpstat
);
4601 inf_status
->breakpoint_proceeded
= breakpoint_proceeded
;
4602 inf_status
->restore_stack_info
= restore_stack_info
;
4603 inf_status
->proceed_to_finish
= tp
->proceed_to_finish
;
4605 inf_status
->registers
= regcache_dup (get_current_regcache ());
4607 inf_status
->selected_frame_id
= get_frame_id (get_selected_frame (NULL
));
4612 restore_selected_frame (void *args
)
4614 struct frame_id
*fid
= (struct frame_id
*) args
;
4615 struct frame_info
*frame
;
4617 frame
= frame_find_by_id (*fid
);
4619 /* If inf_status->selected_frame_id is NULL, there was no previously
4623 warning (_("Unable to restore previously selected frame."));
4627 select_frame (frame
);
4633 restore_inferior_status (struct inferior_status
*inf_status
)
4635 struct thread_info
*tp
= inferior_thread ();
4636 struct inferior
*inf
= current_inferior ();
4638 tp
->stop_signal
= inf_status
->stop_signal
;
4639 stop_pc
= inf_status
->stop_pc
;
4640 tp
->stop_step
= inf_status
->stop_step
;
4641 stop_stack_dummy
= inf_status
->stop_stack_dummy
;
4642 stopped_by_random_signal
= inf_status
->stopped_by_random_signal
;
4643 tp
->trap_expected
= inf_status
->stepping_over_breakpoint
;
4644 tp
->step_range_start
= inf_status
->step_range_start
;
4645 tp
->step_range_end
= inf_status
->step_range_end
;
4646 tp
->step_frame_id
= inf_status
->step_frame_id
;
4647 tp
->step_over_calls
= inf_status
->step_over_calls
;
4648 stop_after_trap
= inf_status
->stop_after_trap
;
4649 inf
->stop_soon
= inf_status
->stop_soon
;
4650 bpstat_clear (&tp
->stop_bpstat
);
4651 tp
->stop_bpstat
= inf_status
->stop_bpstat
;
4652 breakpoint_proceeded
= inf_status
->breakpoint_proceeded
;
4653 tp
->proceed_to_finish
= inf_status
->proceed_to_finish
;
4655 /* The inferior can be gone if the user types "print exit(0)"
4656 (and perhaps other times). */
4657 if (target_has_execution
)
4658 /* NB: The register write goes through to the target. */
4659 regcache_cpy (get_current_regcache (), inf_status
->registers
);
4660 regcache_xfree (inf_status
->registers
);
4662 /* FIXME: If we are being called after stopping in a function which
4663 is called from gdb, we should not be trying to restore the
4664 selected frame; it just prints a spurious error message (The
4665 message is useful, however, in detecting bugs in gdb (like if gdb
4666 clobbers the stack)). In fact, should we be restoring the
4667 inferior status at all in that case? . */
4669 if (target_has_stack
&& inf_status
->restore_stack_info
)
4671 /* The point of catch_errors is that if the stack is clobbered,
4672 walking the stack might encounter a garbage pointer and
4673 error() trying to dereference it. */
4675 (restore_selected_frame
, &inf_status
->selected_frame_id
,
4676 "Unable to restore previously selected frame:\n",
4677 RETURN_MASK_ERROR
) == 0)
4678 /* Error in restoring the selected frame. Select the innermost
4680 select_frame (get_current_frame ());
4688 do_restore_inferior_status_cleanup (void *sts
)
4690 restore_inferior_status (sts
);
4694 make_cleanup_restore_inferior_status (struct inferior_status
*inf_status
)
4696 return make_cleanup (do_restore_inferior_status_cleanup
, inf_status
);
4700 discard_inferior_status (struct inferior_status
*inf_status
)
4702 /* See save_inferior_status for info on stop_bpstat. */
4703 bpstat_clear (&inf_status
->stop_bpstat
);
4704 regcache_xfree (inf_status
->registers
);
4709 inferior_has_forked (ptid_t pid
, ptid_t
*child_pid
)
4711 struct target_waitstatus last
;
4714 get_last_target_status (&last_ptid
, &last
);
4716 if (last
.kind
!= TARGET_WAITKIND_FORKED
)
4719 if (!ptid_equal (last_ptid
, pid
))
4722 *child_pid
= last
.value
.related_pid
;
4727 inferior_has_vforked (ptid_t pid
, ptid_t
*child_pid
)
4729 struct target_waitstatus last
;
4732 get_last_target_status (&last_ptid
, &last
);
4734 if (last
.kind
!= TARGET_WAITKIND_VFORKED
)
4737 if (!ptid_equal (last_ptid
, pid
))
4740 *child_pid
= last
.value
.related_pid
;
4745 inferior_has_execd (ptid_t pid
, char **execd_pathname
)
4747 struct target_waitstatus last
;
4750 get_last_target_status (&last_ptid
, &last
);
4752 if (last
.kind
!= TARGET_WAITKIND_EXECD
)
4755 if (!ptid_equal (last_ptid
, pid
))
4758 *execd_pathname
= xstrdup (last
.value
.execd_pathname
);
4762 /* Oft used ptids */
4764 ptid_t minus_one_ptid
;
4766 /* Create a ptid given the necessary PID, LWP, and TID components. */
4769 ptid_build (int pid
, long lwp
, long tid
)
4779 /* Create a ptid from just a pid. */
4782 pid_to_ptid (int pid
)
4784 return ptid_build (pid
, 0, 0);
4787 /* Fetch the pid (process id) component from a ptid. */
4790 ptid_get_pid (ptid_t ptid
)
4795 /* Fetch the lwp (lightweight process) component from a ptid. */
4798 ptid_get_lwp (ptid_t ptid
)
4803 /* Fetch the tid (thread id) component from a ptid. */
4806 ptid_get_tid (ptid_t ptid
)
4811 /* ptid_equal() is used to test equality of two ptids. */
4814 ptid_equal (ptid_t ptid1
, ptid_t ptid2
)
4816 return (ptid1
.pid
== ptid2
.pid
&& ptid1
.lwp
== ptid2
.lwp
4817 && ptid1
.tid
== ptid2
.tid
);
4820 /* restore_inferior_ptid() will be used by the cleanup machinery
4821 to restore the inferior_ptid value saved in a call to
4822 save_inferior_ptid(). */
4825 restore_inferior_ptid (void *arg
)
4827 ptid_t
*saved_ptid_ptr
= arg
;
4828 inferior_ptid
= *saved_ptid_ptr
;
4832 /* Save the value of inferior_ptid so that it may be restored by a
4833 later call to do_cleanups(). Returns the struct cleanup pointer
4834 needed for later doing the cleanup. */
4837 save_inferior_ptid (void)
4839 ptid_t
*saved_ptid_ptr
;
4841 saved_ptid_ptr
= xmalloc (sizeof (ptid_t
));
4842 *saved_ptid_ptr
= inferior_ptid
;
4843 return make_cleanup (restore_inferior_ptid
, saved_ptid_ptr
);
4847 /* User interface for reverse debugging:
4848 Set exec-direction / show exec-direction commands
4849 (returns error unless target implements to_set_exec_direction method). */
4851 enum exec_direction_kind execution_direction
= EXEC_FORWARD
;
4852 static const char exec_forward
[] = "forward";
4853 static const char exec_reverse
[] = "reverse";
4854 static const char *exec_direction
= exec_forward
;
4855 static const char *exec_direction_names
[] = {
4862 set_exec_direction_func (char *args
, int from_tty
,
4863 struct cmd_list_element
*cmd
)
4865 if (target_can_execute_reverse
)
4867 if (!strcmp (exec_direction
, exec_forward
))
4868 execution_direction
= EXEC_FORWARD
;
4869 else if (!strcmp (exec_direction
, exec_reverse
))
4870 execution_direction
= EXEC_REVERSE
;
4875 show_exec_direction_func (struct ui_file
*out
, int from_tty
,
4876 struct cmd_list_element
*cmd
, const char *value
)
4878 switch (execution_direction
) {
4880 fprintf_filtered (out
, _("Forward.\n"));
4883 fprintf_filtered (out
, _("Reverse.\n"));
4887 fprintf_filtered (out
,
4888 _("Forward (target `%s' does not support exec-direction).\n"),
4894 /* User interface for non-stop mode. */
4897 static int non_stop_1
= 0;
4900 set_non_stop (char *args
, int from_tty
,
4901 struct cmd_list_element
*c
)
4903 if (target_has_execution
)
4905 non_stop_1
= non_stop
;
4906 error (_("Cannot change this setting while the inferior is running."));
4909 non_stop
= non_stop_1
;
4913 show_non_stop (struct ui_file
*file
, int from_tty
,
4914 struct cmd_list_element
*c
, const char *value
)
4916 fprintf_filtered (file
,
4917 _("Controlling the inferior in non-stop mode is %s.\n"),
4923 _initialize_infrun (void)
4927 struct cmd_list_element
*c
;
4929 add_info ("signals", signals_info
, _("\
4930 What debugger does when program gets various signals.\n\
4931 Specify a signal as argument to print info on that signal only."));
4932 add_info_alias ("handle", "signals", 0);
4934 add_com ("handle", class_run
, handle_command
, _("\
4935 Specify how to handle a signal.\n\
4936 Args are signals and actions to apply to those signals.\n\
4937 Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\
4938 from 1-15 are allowed for compatibility with old versions of GDB.\n\
4939 Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\
4940 The special arg \"all\" is recognized to mean all signals except those\n\
4941 used by the debugger, typically SIGTRAP and SIGINT.\n\
4942 Recognized actions include \"stop\", \"nostop\", \"print\", \"noprint\",\n\
4943 \"pass\", \"nopass\", \"ignore\", or \"noignore\".\n\
4944 Stop means reenter debugger if this signal happens (implies print).\n\
4945 Print means print a message if this signal happens.\n\
4946 Pass means let program see this signal; otherwise program doesn't know.\n\
4947 Ignore is a synonym for nopass and noignore is a synonym for pass.\n\
4948 Pass and Stop may be combined."));
4951 add_com ("lz", class_info
, signals_info
, _("\
4952 What debugger does when program gets various signals.\n\
4953 Specify a signal as argument to print info on that signal only."));
4954 add_com ("z", class_run
, xdb_handle_command
, _("\
4955 Specify how to handle a signal.\n\
4956 Args are signals and actions to apply to those signals.\n\
4957 Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\
4958 from 1-15 are allowed for compatibility with old versions of GDB.\n\
4959 Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\
4960 The special arg \"all\" is recognized to mean all signals except those\n\
4961 used by the debugger, typically SIGTRAP and SIGINT.\n\
4962 Recognized actions include \"s\" (toggles between stop and nostop), \n\
4963 \"r\" (toggles between print and noprint), \"i\" (toggles between pass and \
4964 nopass), \"Q\" (noprint)\n\
4965 Stop means reenter debugger if this signal happens (implies print).\n\
4966 Print means print a message if this signal happens.\n\
4967 Pass means let program see this signal; otherwise program doesn't know.\n\
4968 Ignore is a synonym for nopass and noignore is a synonym for pass.\n\
4969 Pass and Stop may be combined."));
4973 stop_command
= add_cmd ("stop", class_obscure
,
4974 not_just_help_class_command
, _("\
4975 There is no `stop' command, but you can set a hook on `stop'.\n\
4976 This allows you to set a list of commands to be run each time execution\n\
4977 of the program stops."), &cmdlist
);
4979 add_setshow_zinteger_cmd ("infrun", class_maintenance
, &debug_infrun
, _("\
4980 Set inferior debugging."), _("\
4981 Show inferior debugging."), _("\
4982 When non-zero, inferior specific debugging is enabled."),
4985 &setdebuglist
, &showdebuglist
);
4987 add_setshow_boolean_cmd ("displaced", class_maintenance
, &debug_displaced
, _("\
4988 Set displaced stepping debugging."), _("\
4989 Show displaced stepping debugging."), _("\
4990 When non-zero, displaced stepping specific debugging is enabled."),
4992 show_debug_displaced
,
4993 &setdebuglist
, &showdebuglist
);
4995 add_setshow_boolean_cmd ("non-stop", no_class
,
4997 Set whether gdb controls the inferior in non-stop mode."), _("\
4998 Show whether gdb controls the inferior in non-stop mode."), _("\
4999 When debugging a multi-threaded program and this setting is\n\
5000 off (the default, also called all-stop mode), when one thread stops\n\
5001 (for a breakpoint, watchpoint, exception, or similar events), GDB stops\n\
5002 all other threads in the program while you interact with the thread of\n\
5003 interest. When you continue or step a thread, you can allow the other\n\
5004 threads to run, or have them remain stopped, but while you inspect any\n\
5005 thread's state, all threads stop.\n\
5007 In non-stop mode, when one thread stops, other threads can continue\n\
5008 to run freely. You'll be able to step each thread independently,\n\
5009 leave it stopped or free to run as needed."),
5015 numsigs
= (int) TARGET_SIGNAL_LAST
;
5016 signal_stop
= (unsigned char *) xmalloc (sizeof (signal_stop
[0]) * numsigs
);
5017 signal_print
= (unsigned char *)
5018 xmalloc (sizeof (signal_print
[0]) * numsigs
);
5019 signal_program
= (unsigned char *)
5020 xmalloc (sizeof (signal_program
[0]) * numsigs
);
5021 for (i
= 0; i
< numsigs
; i
++)
5024 signal_print
[i
] = 1;
5025 signal_program
[i
] = 1;
5028 /* Signals caused by debugger's own actions
5029 should not be given to the program afterwards. */
5030 signal_program
[TARGET_SIGNAL_TRAP
] = 0;
5031 signal_program
[TARGET_SIGNAL_INT
] = 0;
5033 /* Signals that are not errors should not normally enter the debugger. */
5034 signal_stop
[TARGET_SIGNAL_ALRM
] = 0;
5035 signal_print
[TARGET_SIGNAL_ALRM
] = 0;
5036 signal_stop
[TARGET_SIGNAL_VTALRM
] = 0;
5037 signal_print
[TARGET_SIGNAL_VTALRM
] = 0;
5038 signal_stop
[TARGET_SIGNAL_PROF
] = 0;
5039 signal_print
[TARGET_SIGNAL_PROF
] = 0;
5040 signal_stop
[TARGET_SIGNAL_CHLD
] = 0;
5041 signal_print
[TARGET_SIGNAL_CHLD
] = 0;
5042 signal_stop
[TARGET_SIGNAL_IO
] = 0;
5043 signal_print
[TARGET_SIGNAL_IO
] = 0;
5044 signal_stop
[TARGET_SIGNAL_POLL
] = 0;
5045 signal_print
[TARGET_SIGNAL_POLL
] = 0;
5046 signal_stop
[TARGET_SIGNAL_URG
] = 0;
5047 signal_print
[TARGET_SIGNAL_URG
] = 0;
5048 signal_stop
[TARGET_SIGNAL_WINCH
] = 0;
5049 signal_print
[TARGET_SIGNAL_WINCH
] = 0;
5051 /* These signals are used internally by user-level thread
5052 implementations. (See signal(5) on Solaris.) Like the above
5053 signals, a healthy program receives and handles them as part of
5054 its normal operation. */
5055 signal_stop
[TARGET_SIGNAL_LWP
] = 0;
5056 signal_print
[TARGET_SIGNAL_LWP
] = 0;
5057 signal_stop
[TARGET_SIGNAL_WAITING
] = 0;
5058 signal_print
[TARGET_SIGNAL_WAITING
] = 0;
5059 signal_stop
[TARGET_SIGNAL_CANCEL
] = 0;
5060 signal_print
[TARGET_SIGNAL_CANCEL
] = 0;
5062 add_setshow_zinteger_cmd ("stop-on-solib-events", class_support
,
5063 &stop_on_solib_events
, _("\
5064 Set stopping for shared library events."), _("\
5065 Show stopping for shared library events."), _("\
5066 If nonzero, gdb will give control to the user when the dynamic linker\n\
5067 notifies gdb of shared library events. The most common event of interest\n\
5068 to the user would be loading/unloading of a new library."),
5070 show_stop_on_solib_events
,
5071 &setlist
, &showlist
);
5073 add_setshow_enum_cmd ("follow-fork-mode", class_run
,
5074 follow_fork_mode_kind_names
,
5075 &follow_fork_mode_string
, _("\
5076 Set debugger response to a program call of fork or vfork."), _("\
5077 Show debugger response to a program call of fork or vfork."), _("\
5078 A fork or vfork creates a new process. follow-fork-mode can be:\n\
5079 parent - the original process is debugged after a fork\n\
5080 child - the new process is debugged after a fork\n\
5081 The unfollowed process will continue to run.\n\
5082 By default, the debugger will follow the parent process."),
5084 show_follow_fork_mode_string
,
5085 &setlist
, &showlist
);
5087 add_setshow_enum_cmd ("scheduler-locking", class_run
,
5088 scheduler_enums
, &scheduler_mode
, _("\
5089 Set mode for locking scheduler during execution."), _("\
5090 Show mode for locking scheduler during execution."), _("\
5091 off == no locking (threads may preempt at any time)\n\
5092 on == full locking (no thread except the current thread may run)\n\
5093 step == scheduler locked during every single-step operation.\n\
5094 In this mode, no other thread may run during a step command.\n\
5095 Other threads may run while stepping over a function call ('next')."),
5096 set_schedlock_func
, /* traps on target vector */
5097 show_scheduler_mode
,
5098 &setlist
, &showlist
);
5100 add_setshow_boolean_cmd ("step-mode", class_run
, &step_stop_if_no_debug
, _("\
5101 Set mode of the step operation."), _("\
5102 Show mode of the step operation."), _("\
5103 When set, doing a step over a function without debug line information\n\
5104 will stop at the first instruction of that function. Otherwise, the\n\
5105 function is skipped and the step command stops at a different source line."),
5107 show_step_stop_if_no_debug
,
5108 &setlist
, &showlist
);
5110 add_setshow_boolean_cmd ("can-use-displaced-stepping", class_maintenance
,
5111 &can_use_displaced_stepping
, _("\
5112 Set debugger's willingness to use displaced stepping."), _("\
5113 Show debugger's willingness to use displaced stepping."), _("\
5114 If zero, gdb will not use displaced stepping to step over\n\
5115 breakpoints, even if such is supported by the target."),
5117 show_can_use_displaced_stepping
,
5118 &maintenance_set_cmdlist
,
5119 &maintenance_show_cmdlist
);
5121 add_setshow_enum_cmd ("exec-direction", class_run
, exec_direction_names
,
5122 &exec_direction
, _("Set direction of execution.\n\
5123 Options are 'forward' or 'reverse'."),
5124 _("Show direction of execution (forward/reverse)."),
5125 _("Tells gdb whether to execute forward or backward."),
5126 set_exec_direction_func
, show_exec_direction_func
,
5127 &setlist
, &showlist
);
5129 /* ptid initializations */
5130 null_ptid
= ptid_build (0, 0, 0);
5131 minus_one_ptid
= ptid_build (-1, 0, 0);
5132 inferior_ptid
= null_ptid
;
5133 target_last_wait_ptid
= minus_one_ptid
;
5134 displaced_step_ptid
= null_ptid
;
5136 observer_attach_thread_ptid_changed (infrun_thread_ptid_changed
);