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 /* Enum strings for "set|show displaced-stepping". */
558 static const char can_use_displaced_stepping_auto
[] = "auto";
559 static const char can_use_displaced_stepping_on
[] = "on";
560 static const char can_use_displaced_stepping_off
[] = "off";
561 static const char *can_use_displaced_stepping_enum
[] =
563 can_use_displaced_stepping_auto
,
564 can_use_displaced_stepping_on
,
565 can_use_displaced_stepping_off
,
569 /* If ON, and the architecture supports it, GDB will use displaced
570 stepping to step over breakpoints. If OFF, or if the architecture
571 doesn't support it, GDB will instead use the traditional
572 hold-and-step approach. If AUTO (which is the default), GDB will
573 decide which technique to use to step over breakpoints depending on
574 which of all-stop or non-stop mode is active --- displaced stepping
575 in non-stop mode; hold-and-step in all-stop mode. */
577 static const char *can_use_displaced_stepping
=
578 can_use_displaced_stepping_auto
;
581 show_can_use_displaced_stepping (struct ui_file
*file
, int from_tty
,
582 struct cmd_list_element
*c
,
585 if (can_use_displaced_stepping
== can_use_displaced_stepping_auto
)
586 fprintf_filtered (file
, _("\
587 Debugger's willingness to use displaced stepping to step over \
588 breakpoints is %s (currently %s).\n"),
589 value
, non_stop
? "on" : "off");
591 fprintf_filtered (file
, _("\
592 Debugger's willingness to use displaced stepping to step over \
593 breakpoints is %s.\n"), value
);
596 /* Return non-zero if displaced stepping can/should be used to step
600 use_displaced_stepping (struct gdbarch
*gdbarch
)
602 return (((can_use_displaced_stepping
== can_use_displaced_stepping_auto
604 || can_use_displaced_stepping
== can_use_displaced_stepping_on
)
605 && gdbarch_displaced_step_copy_insn_p (gdbarch
));
608 /* Clean out any stray displaced stepping state. */
610 displaced_step_clear (void)
612 /* Indicate that there is no cleanup pending. */
613 displaced_step_ptid
= null_ptid
;
615 if (displaced_step_closure
)
617 gdbarch_displaced_step_free_closure (displaced_step_gdbarch
,
618 displaced_step_closure
);
619 displaced_step_closure
= NULL
;
624 cleanup_displaced_step_closure (void *ptr
)
626 struct displaced_step_closure
*closure
= ptr
;
628 gdbarch_displaced_step_free_closure (current_gdbarch
, closure
);
631 /* Dump LEN bytes at BUF in hex to FILE, followed by a newline. */
633 displaced_step_dump_bytes (struct ui_file
*file
,
639 for (i
= 0; i
< len
; i
++)
640 fprintf_unfiltered (file
, "%02x ", buf
[i
]);
641 fputs_unfiltered ("\n", file
);
644 /* Prepare to single-step, using displaced stepping.
646 Note that we cannot use displaced stepping when we have a signal to
647 deliver. If we have a signal to deliver and an instruction to step
648 over, then after the step, there will be no indication from the
649 target whether the thread entered a signal handler or ignored the
650 signal and stepped over the instruction successfully --- both cases
651 result in a simple SIGTRAP. In the first case we mustn't do a
652 fixup, and in the second case we must --- but we can't tell which.
653 Comments in the code for 'random signals' in handle_inferior_event
654 explain how we handle this case instead.
656 Returns 1 if preparing was successful -- this thread is going to be
657 stepped now; or 0 if displaced stepping this thread got queued. */
659 displaced_step_prepare (ptid_t ptid
)
661 struct cleanup
*old_cleanups
, *ignore_cleanups
;
662 struct regcache
*regcache
= get_thread_regcache (ptid
);
663 struct gdbarch
*gdbarch
= get_regcache_arch (regcache
);
664 CORE_ADDR original
, copy
;
666 struct displaced_step_closure
*closure
;
668 /* We should never reach this function if the architecture does not
669 support displaced stepping. */
670 gdb_assert (gdbarch_displaced_step_copy_insn_p (gdbarch
));
672 /* For the first cut, we're displaced stepping one thread at a
675 if (!ptid_equal (displaced_step_ptid
, null_ptid
))
677 /* Already waiting for a displaced step to finish. Defer this
678 request and place in queue. */
679 struct displaced_step_request
*req
, *new_req
;
682 fprintf_unfiltered (gdb_stdlog
,
683 "displaced: defering step of %s\n",
684 target_pid_to_str (ptid
));
686 new_req
= xmalloc (sizeof (*new_req
));
687 new_req
->ptid
= ptid
;
688 new_req
->next
= NULL
;
690 if (displaced_step_request_queue
)
692 for (req
= displaced_step_request_queue
;
699 displaced_step_request_queue
= new_req
;
706 fprintf_unfiltered (gdb_stdlog
,
707 "displaced: stepping %s now\n",
708 target_pid_to_str (ptid
));
711 displaced_step_clear ();
713 old_cleanups
= save_inferior_ptid ();
714 inferior_ptid
= ptid
;
716 original
= regcache_read_pc (regcache
);
718 copy
= gdbarch_displaced_step_location (gdbarch
);
719 len
= gdbarch_max_insn_length (gdbarch
);
721 /* Save the original contents of the copy area. */
722 displaced_step_saved_copy
= xmalloc (len
);
723 ignore_cleanups
= make_cleanup (free_current_contents
,
724 &displaced_step_saved_copy
);
725 read_memory (copy
, displaced_step_saved_copy
, len
);
728 fprintf_unfiltered (gdb_stdlog
, "displaced: saved 0x%s: ",
730 displaced_step_dump_bytes (gdb_stdlog
, displaced_step_saved_copy
, len
);
733 closure
= gdbarch_displaced_step_copy_insn (gdbarch
,
734 original
, copy
, regcache
);
736 /* We don't support the fully-simulated case at present. */
737 gdb_assert (closure
);
739 make_cleanup (cleanup_displaced_step_closure
, closure
);
741 /* Resume execution at the copy. */
742 regcache_write_pc (regcache
, copy
);
744 discard_cleanups (ignore_cleanups
);
746 do_cleanups (old_cleanups
);
749 fprintf_unfiltered (gdb_stdlog
, "displaced: displaced pc to 0x%s\n",
752 /* Save the information we need to fix things up if the step
754 displaced_step_ptid
= ptid
;
755 displaced_step_gdbarch
= gdbarch
;
756 displaced_step_closure
= closure
;
757 displaced_step_original
= original
;
758 displaced_step_copy
= copy
;
763 displaced_step_clear_cleanup (void *ignore
)
765 displaced_step_clear ();
769 write_memory_ptid (ptid_t ptid
, CORE_ADDR memaddr
, const gdb_byte
*myaddr
, int len
)
771 struct cleanup
*ptid_cleanup
= save_inferior_ptid ();
772 inferior_ptid
= ptid
;
773 write_memory (memaddr
, myaddr
, len
);
774 do_cleanups (ptid_cleanup
);
778 displaced_step_fixup (ptid_t event_ptid
, enum target_signal signal
)
780 struct cleanup
*old_cleanups
;
782 /* Was this event for the pid we displaced? */
783 if (ptid_equal (displaced_step_ptid
, null_ptid
)
784 || ! ptid_equal (displaced_step_ptid
, event_ptid
))
787 old_cleanups
= make_cleanup (displaced_step_clear_cleanup
, 0);
789 /* Restore the contents of the copy area. */
791 ULONGEST len
= gdbarch_max_insn_length (displaced_step_gdbarch
);
792 write_memory_ptid (displaced_step_ptid
, displaced_step_copy
,
793 displaced_step_saved_copy
, len
);
795 fprintf_unfiltered (gdb_stdlog
, "displaced: restored 0x%s\n",
796 paddr_nz (displaced_step_copy
));
799 /* Did the instruction complete successfully? */
800 if (signal
== TARGET_SIGNAL_TRAP
)
802 /* Fix up the resulting state. */
803 gdbarch_displaced_step_fixup (displaced_step_gdbarch
,
804 displaced_step_closure
,
805 displaced_step_original
,
807 get_thread_regcache (displaced_step_ptid
));
811 /* Since the instruction didn't complete, all we can do is
813 struct regcache
*regcache
= get_thread_regcache (event_ptid
);
814 CORE_ADDR pc
= regcache_read_pc (regcache
);
815 pc
= displaced_step_original
+ (pc
- displaced_step_copy
);
816 regcache_write_pc (regcache
, pc
);
819 do_cleanups (old_cleanups
);
821 displaced_step_ptid
= null_ptid
;
823 /* Are there any pending displaced stepping requests? If so, run
825 while (displaced_step_request_queue
)
827 struct displaced_step_request
*head
;
831 head
= displaced_step_request_queue
;
833 displaced_step_request_queue
= head
->next
;
836 context_switch (ptid
);
838 actual_pc
= read_pc ();
840 if (breakpoint_here_p (actual_pc
))
843 fprintf_unfiltered (gdb_stdlog
,
844 "displaced: stepping queued %s now\n",
845 target_pid_to_str (ptid
));
847 displaced_step_prepare (ptid
);
853 fprintf_unfiltered (gdb_stdlog
, "displaced: run 0x%s: ",
854 paddr_nz (actual_pc
));
855 read_memory (actual_pc
, buf
, sizeof (buf
));
856 displaced_step_dump_bytes (gdb_stdlog
, buf
, sizeof (buf
));
859 target_resume (ptid
, 1, TARGET_SIGNAL_0
);
861 /* Done, we're stepping a thread. */
867 struct thread_info
*tp
= inferior_thread ();
869 /* The breakpoint we were sitting under has since been
871 tp
->trap_expected
= 0;
873 /* Go back to what we were trying to do. */
874 step
= currently_stepping (tp
);
877 fprintf_unfiltered (gdb_stdlog
, "breakpoint is gone %s: step(%d)\n",
878 target_pid_to_str (tp
->ptid
), step
);
880 target_resume (ptid
, step
, TARGET_SIGNAL_0
);
881 tp
->stop_signal
= TARGET_SIGNAL_0
;
883 /* This request was discarded. See if there's any other
884 thread waiting for its turn. */
889 /* Update global variables holding ptids to hold NEW_PTID if they were
892 infrun_thread_ptid_changed (ptid_t old_ptid
, ptid_t new_ptid
)
894 struct displaced_step_request
*it
;
896 if (ptid_equal (inferior_ptid
, old_ptid
))
897 inferior_ptid
= new_ptid
;
899 if (ptid_equal (singlestep_ptid
, old_ptid
))
900 singlestep_ptid
= new_ptid
;
902 if (ptid_equal (displaced_step_ptid
, old_ptid
))
903 displaced_step_ptid
= new_ptid
;
905 if (ptid_equal (deferred_step_ptid
, old_ptid
))
906 deferred_step_ptid
= new_ptid
;
908 for (it
= displaced_step_request_queue
; it
; it
= it
->next
)
909 if (ptid_equal (it
->ptid
, old_ptid
))
916 /* Things to clean up if we QUIT out of resume (). */
918 resume_cleanups (void *ignore
)
923 static const char schedlock_off
[] = "off";
924 static const char schedlock_on
[] = "on";
925 static const char schedlock_step
[] = "step";
926 static const char *scheduler_enums
[] = {
932 static const char *scheduler_mode
= schedlock_off
;
934 show_scheduler_mode (struct ui_file
*file
, int from_tty
,
935 struct cmd_list_element
*c
, const char *value
)
937 fprintf_filtered (file
, _("\
938 Mode for locking scheduler during execution is \"%s\".\n"),
943 set_schedlock_func (char *args
, int from_tty
, struct cmd_list_element
*c
)
945 if (!target_can_lock_scheduler
)
947 scheduler_mode
= schedlock_off
;
948 error (_("Target '%s' cannot support this command."), target_shortname
);
953 /* Resume the inferior, but allow a QUIT. This is useful if the user
954 wants to interrupt some lengthy single-stepping operation
955 (for child processes, the SIGINT goes to the inferior, and so
956 we get a SIGINT random_signal, but for remote debugging and perhaps
957 other targets, that's not true).
959 STEP nonzero if we should step (zero to continue instead).
960 SIG is the signal to give the inferior (zero for none). */
962 resume (int step
, enum target_signal sig
)
964 int should_resume
= 1;
965 struct cleanup
*old_cleanups
= make_cleanup (resume_cleanups
, 0);
966 struct regcache
*regcache
= get_current_regcache ();
967 struct gdbarch
*gdbarch
= get_regcache_arch (regcache
);
968 struct thread_info
*tp
= inferior_thread ();
969 CORE_ADDR pc
= regcache_read_pc (regcache
);
973 fprintf_unfiltered (gdb_stdlog
,
974 "infrun: resume (step=%d, signal=%d), "
975 "trap_expected=%d\n",
976 step
, sig
, tp
->trap_expected
);
978 /* Some targets (e.g. Solaris x86) have a kernel bug when stepping
979 over an instruction that causes a page fault without triggering
980 a hardware watchpoint. The kernel properly notices that it shouldn't
981 stop, because the hardware watchpoint is not triggered, but it forgets
982 the step request and continues the program normally.
983 Work around the problem by removing hardware watchpoints if a step is
984 requested, GDB will check for a hardware watchpoint trigger after the
986 if (CANNOT_STEP_HW_WATCHPOINTS
&& step
)
987 remove_hw_watchpoints ();
990 /* Normally, by the time we reach `resume', the breakpoints are either
991 removed or inserted, as appropriate. The exception is if we're sitting
992 at a permanent breakpoint; we need to step over it, but permanent
993 breakpoints can't be removed. So we have to test for it here. */
994 if (breakpoint_here_p (pc
) == permanent_breakpoint_here
)
996 if (gdbarch_skip_permanent_breakpoint_p (gdbarch
))
997 gdbarch_skip_permanent_breakpoint (gdbarch
, regcache
);
1000 The program is stopped at a permanent breakpoint, but GDB does not know\n\
1001 how to step past a permanent breakpoint on this architecture. Try using\n\
1002 a command like `return' or `jump' to continue execution."));
1005 /* If enabled, step over breakpoints by executing a copy of the
1006 instruction at a different address.
1008 We can't use displaced stepping when we have a signal to deliver;
1009 the comments for displaced_step_prepare explain why. The
1010 comments in the handle_inferior event for dealing with 'random
1011 signals' explain what we do instead. */
1012 if (use_displaced_stepping (gdbarch
)
1013 && tp
->trap_expected
1014 && sig
== TARGET_SIGNAL_0
)
1016 if (!displaced_step_prepare (inferior_ptid
))
1018 /* Got placed in displaced stepping queue. Will be resumed
1019 later when all the currently queued displaced stepping
1020 requests finish. The thread is not executing at this point,
1021 and the call to set_executing will be made later. But we
1022 need to call set_running here, since from frontend point of view,
1023 the thread is running. */
1024 set_running (inferior_ptid
, 1);
1025 discard_cleanups (old_cleanups
);
1030 if (step
&& gdbarch_software_single_step_p (gdbarch
))
1032 /* Do it the hard way, w/temp breakpoints */
1033 if (gdbarch_software_single_step (gdbarch
, get_current_frame ()))
1035 /* ...and don't ask hardware to do it. */
1037 /* and do not pull these breakpoints until after a `wait' in
1038 `wait_for_inferior' */
1039 singlestep_breakpoints_inserted_p
= 1;
1040 singlestep_ptid
= inferior_ptid
;
1045 /* If there were any forks/vforks/execs that were caught and are
1046 now to be followed, then do so. */
1047 switch (pending_follow
.kind
)
1049 case TARGET_WAITKIND_FORKED
:
1050 case TARGET_WAITKIND_VFORKED
:
1051 pending_follow
.kind
= TARGET_WAITKIND_SPURIOUS
;
1056 case TARGET_WAITKIND_EXECD
:
1057 /* follow_exec is called as soon as the exec event is seen. */
1058 pending_follow
.kind
= TARGET_WAITKIND_SPURIOUS
;
1065 /* Install inferior's terminal modes. */
1066 target_terminal_inferior ();
1072 resume_ptid
= RESUME_ALL
; /* Default */
1074 /* If STEP is set, it's a request to use hardware stepping
1075 facilities. But in that case, we should never
1076 use singlestep breakpoint. */
1077 gdb_assert (!(singlestep_breakpoints_inserted_p
&& step
));
1079 if (singlestep_breakpoints_inserted_p
1080 && stepping_past_singlestep_breakpoint
)
1082 /* The situation here is as follows. In thread T1 we wanted to
1083 single-step. Lacking hardware single-stepping we've
1084 set breakpoint at the PC of the next instruction -- call it
1085 P. After resuming, we've hit that breakpoint in thread T2.
1086 Now we've removed original breakpoint, inserted breakpoint
1087 at P+1, and try to step to advance T2 past breakpoint.
1088 We need to step only T2, as if T1 is allowed to freely run,
1089 it can run past P, and if other threads are allowed to run,
1090 they can hit breakpoint at P+1, and nested hits of single-step
1091 breakpoints is not something we'd want -- that's complicated
1092 to support, and has no value. */
1093 resume_ptid
= inferior_ptid
;
1096 if ((step
|| singlestep_breakpoints_inserted_p
)
1097 && tp
->trap_expected
)
1099 /* We're allowing a thread to run past a breakpoint it has
1100 hit, by single-stepping the thread with the breakpoint
1101 removed. In which case, we need to single-step only this
1102 thread, and keep others stopped, as they can miss this
1103 breakpoint if allowed to run.
1105 The current code actually removes all breakpoints when
1106 doing this, not just the one being stepped over, so if we
1107 let other threads run, we can actually miss any
1108 breakpoint, not just the one at PC. */
1109 resume_ptid
= inferior_ptid
;
1114 /* With non-stop mode on, threads are always handled
1116 resume_ptid
= inferior_ptid
;
1118 else if ((scheduler_mode
== schedlock_on
)
1119 || (scheduler_mode
== schedlock_step
1120 && (step
|| singlestep_breakpoints_inserted_p
)))
1122 /* User-settable 'scheduler' mode requires solo thread resume. */
1123 resume_ptid
= inferior_ptid
;
1126 if (gdbarch_cannot_step_breakpoint (gdbarch
))
1128 /* Most targets can step a breakpoint instruction, thus
1129 executing it normally. But if this one cannot, just
1130 continue and we will hit it anyway. */
1131 if (step
&& breakpoint_inserted_here_p (pc
))
1136 && use_displaced_stepping (gdbarch
)
1137 && tp
->trap_expected
)
1139 struct regcache
*resume_regcache
= get_thread_regcache (resume_ptid
);
1140 CORE_ADDR actual_pc
= regcache_read_pc (resume_regcache
);
1143 fprintf_unfiltered (gdb_stdlog
, "displaced: run 0x%s: ",
1144 paddr_nz (actual_pc
));
1145 read_memory (actual_pc
, buf
, sizeof (buf
));
1146 displaced_step_dump_bytes (gdb_stdlog
, buf
, sizeof (buf
));
1149 target_resume (resume_ptid
, step
, sig
);
1151 /* Avoid confusing the next resume, if the next stop/resume
1152 happens to apply to another thread. */
1153 tp
->stop_signal
= TARGET_SIGNAL_0
;
1156 discard_cleanups (old_cleanups
);
1161 /* Clear out all variables saying what to do when inferior is continued.
1162 First do this, then set the ones you want, then call `proceed'. */
1165 clear_proceed_status (void)
1167 if (!ptid_equal (inferior_ptid
, null_ptid
))
1169 struct thread_info
*tp
;
1170 struct inferior
*inferior
;
1172 tp
= inferior_thread ();
1174 tp
->trap_expected
= 0;
1175 tp
->step_range_start
= 0;
1176 tp
->step_range_end
= 0;
1177 tp
->step_frame_id
= null_frame_id
;
1178 tp
->step_over_calls
= STEP_OVER_UNDEBUGGABLE
;
1179 tp
->stop_requested
= 0;
1183 tp
->proceed_to_finish
= 0;
1185 /* Discard any remaining commands or status from previous
1187 bpstat_clear (&tp
->stop_bpstat
);
1189 inferior
= current_inferior ();
1190 inferior
->stop_soon
= NO_STOP_QUIETLY
;
1193 stop_after_trap
= 0;
1194 breakpoint_proceeded
= 1; /* We're about to proceed... */
1198 regcache_xfree (stop_registers
);
1199 stop_registers
= NULL
;
1203 /* This should be suitable for any targets that support threads. */
1206 prepare_to_proceed (int step
)
1209 struct target_waitstatus wait_status
;
1211 /* Get the last target status returned by target_wait(). */
1212 get_last_target_status (&wait_ptid
, &wait_status
);
1214 /* Make sure we were stopped at a breakpoint. */
1215 if (wait_status
.kind
!= TARGET_WAITKIND_STOPPED
1216 || wait_status
.value
.sig
!= TARGET_SIGNAL_TRAP
)
1221 /* Switched over from WAIT_PID. */
1222 if (!ptid_equal (wait_ptid
, minus_one_ptid
)
1223 && !ptid_equal (inferior_ptid
, wait_ptid
))
1225 struct regcache
*regcache
= get_thread_regcache (wait_ptid
);
1227 if (breakpoint_here_p (regcache_read_pc (regcache
)))
1229 /* If stepping, remember current thread to switch back to. */
1231 deferred_step_ptid
= inferior_ptid
;
1233 /* Switch back to WAIT_PID thread. */
1234 switch_to_thread (wait_ptid
);
1236 /* We return 1 to indicate that there is a breakpoint here,
1237 so we need to step over it before continuing to avoid
1238 hitting it straight away. */
1246 /* Basic routine for continuing the program in various fashions.
1248 ADDR is the address to resume at, or -1 for resume where stopped.
1249 SIGGNAL is the signal to give it, or 0 for none,
1250 or -1 for act according to how it stopped.
1251 STEP is nonzero if should trap after one instruction.
1252 -1 means return after that and print nothing.
1253 You should probably set various step_... variables
1254 before calling here, if you are stepping.
1256 You should call clear_proceed_status before calling proceed. */
1259 proceed (CORE_ADDR addr
, enum target_signal siggnal
, int step
)
1261 struct regcache
*regcache
= get_current_regcache ();
1262 struct gdbarch
*gdbarch
= get_regcache_arch (regcache
);
1263 struct thread_info
*tp
;
1264 CORE_ADDR pc
= regcache_read_pc (regcache
);
1266 enum target_signal stop_signal
;
1269 step_start_function
= find_pc_function (pc
);
1271 stop_after_trap
= 1;
1273 if (addr
== (CORE_ADDR
) -1)
1275 if (pc
== stop_pc
&& breakpoint_here_p (pc
)
1276 && execution_direction
!= EXEC_REVERSE
)
1277 /* There is a breakpoint at the address we will resume at,
1278 step one instruction before inserting breakpoints so that
1279 we do not stop right away (and report a second hit at this
1282 Note, we don't do this in reverse, because we won't
1283 actually be executing the breakpoint insn anyway.
1284 We'll be (un-)executing the previous instruction. */
1287 else if (gdbarch_single_step_through_delay_p (gdbarch
)
1288 && gdbarch_single_step_through_delay (gdbarch
,
1289 get_current_frame ()))
1290 /* We stepped onto an instruction that needs to be stepped
1291 again before re-inserting the breakpoint, do so. */
1296 regcache_write_pc (regcache
, addr
);
1300 fprintf_unfiltered (gdb_stdlog
,
1301 "infrun: proceed (addr=0x%s, signal=%d, step=%d)\n",
1302 paddr_nz (addr
), siggnal
, step
);
1305 /* In non-stop, each thread is handled individually. The context
1306 must already be set to the right thread here. */
1310 /* In a multi-threaded task we may select another thread and
1311 then continue or step.
1313 But if the old thread was stopped at a breakpoint, it will
1314 immediately cause another breakpoint stop without any
1315 execution (i.e. it will report a breakpoint hit incorrectly).
1316 So we must step over it first.
1318 prepare_to_proceed checks the current thread against the
1319 thread that reported the most recent event. If a step-over
1320 is required it returns TRUE and sets the current thread to
1322 if (prepare_to_proceed (step
))
1326 /* prepare_to_proceed may change the current thread. */
1327 tp
= inferior_thread ();
1331 tp
->trap_expected
= 1;
1332 /* If displaced stepping is enabled, we can step over the
1333 breakpoint without hitting it, so leave all breakpoints
1334 inserted. Otherwise we need to disable all breakpoints, step
1335 one instruction, and then re-add them when that step is
1337 if (!use_displaced_stepping (gdbarch
))
1338 remove_breakpoints ();
1341 /* We can insert breakpoints if we're not trying to step over one,
1342 or if we are stepping over one but we're using displaced stepping
1344 if (! tp
->trap_expected
|| use_displaced_stepping (gdbarch
))
1345 insert_breakpoints ();
1349 /* Pass the last stop signal to the thread we're resuming,
1350 irrespective of whether the current thread is the thread that
1351 got the last event or not. This was historically GDB's
1352 behaviour before keeping a stop_signal per thread. */
1354 struct thread_info
*last_thread
;
1356 struct target_waitstatus last_status
;
1358 get_last_target_status (&last_ptid
, &last_status
);
1359 if (!ptid_equal (inferior_ptid
, last_ptid
)
1360 && !ptid_equal (last_ptid
, null_ptid
)
1361 && !ptid_equal (last_ptid
, minus_one_ptid
))
1363 last_thread
= find_thread_pid (last_ptid
);
1366 tp
->stop_signal
= last_thread
->stop_signal
;
1367 last_thread
->stop_signal
= TARGET_SIGNAL_0
;
1372 if (siggnal
!= TARGET_SIGNAL_DEFAULT
)
1373 tp
->stop_signal
= siggnal
;
1374 /* If this signal should not be seen by program,
1375 give it zero. Used for debugging signals. */
1376 else if (!signal_program
[tp
->stop_signal
])
1377 tp
->stop_signal
= TARGET_SIGNAL_0
;
1379 annotate_starting ();
1381 /* Make sure that output from GDB appears before output from the
1383 gdb_flush (gdb_stdout
);
1385 /* Refresh prev_pc value just prior to resuming. This used to be
1386 done in stop_stepping, however, setting prev_pc there did not handle
1387 scenarios such as inferior function calls or returning from
1388 a function via the return command. In those cases, the prev_pc
1389 value was not set properly for subsequent commands. The prev_pc value
1390 is used to initialize the starting line number in the ecs. With an
1391 invalid value, the gdb next command ends up stopping at the position
1392 represented by the next line table entry past our start position.
1393 On platforms that generate one line table entry per line, this
1394 is not a problem. However, on the ia64, the compiler generates
1395 extraneous line table entries that do not increase the line number.
1396 When we issue the gdb next command on the ia64 after an inferior call
1397 or a return command, we often end up a few instructions forward, still
1398 within the original line we started.
1400 An attempt was made to have init_execution_control_state () refresh
1401 the prev_pc value before calculating the line number. This approach
1402 did not work because on platforms that use ptrace, the pc register
1403 cannot be read unless the inferior is stopped. At that point, we
1404 are not guaranteed the inferior is stopped and so the regcache_read_pc ()
1405 call can fail. Setting the prev_pc value here ensures the value is
1406 updated correctly when the inferior is stopped. */
1407 tp
->prev_pc
= regcache_read_pc (get_current_regcache ());
1409 /* Fill in with reasonable starting values. */
1410 init_thread_stepping_state (tp
);
1412 /* Reset to normal state. */
1413 init_infwait_state ();
1415 /* Resume inferior. */
1416 resume (oneproc
|| step
|| bpstat_should_step (), tp
->stop_signal
);
1418 /* Wait for it to stop (if not standalone)
1419 and in any case decode why it stopped, and act accordingly. */
1420 /* Do this only if we are not using the event loop, or if the target
1421 does not support asynchronous execution. */
1422 if (!target_can_async_p ())
1424 wait_for_inferior (0);
1430 /* Start remote-debugging of a machine over a serial link. */
1433 start_remote (int from_tty
)
1435 struct inferior
*inferior
;
1436 init_wait_for_inferior ();
1438 inferior
= current_inferior ();
1439 inferior
->stop_soon
= STOP_QUIETLY_REMOTE
;
1441 /* Always go on waiting for the target, regardless of the mode. */
1442 /* FIXME: cagney/1999-09-23: At present it isn't possible to
1443 indicate to wait_for_inferior that a target should timeout if
1444 nothing is returned (instead of just blocking). Because of this,
1445 targets expecting an immediate response need to, internally, set
1446 things up so that the target_wait() is forced to eventually
1448 /* FIXME: cagney/1999-09-24: It isn't possible for target_open() to
1449 differentiate to its caller what the state of the target is after
1450 the initial open has been performed. Here we're assuming that
1451 the target has stopped. It should be possible to eventually have
1452 target_open() return to the caller an indication that the target
1453 is currently running and GDB state should be set to the same as
1454 for an async run. */
1455 wait_for_inferior (0);
1457 /* Now that the inferior has stopped, do any bookkeeping like
1458 loading shared libraries. We want to do this before normal_stop,
1459 so that the displayed frame is up to date. */
1460 post_create_inferior (¤t_target
, from_tty
);
1465 /* Initialize static vars when a new inferior begins. */
1468 init_wait_for_inferior (void)
1470 /* These are meaningless until the first time through wait_for_inferior. */
1472 breakpoint_init_inferior (inf_starting
);
1474 /* The first resume is not following a fork/vfork/exec. */
1475 pending_follow
.kind
= TARGET_WAITKIND_SPURIOUS
; /* I.e., none. */
1477 clear_proceed_status ();
1479 stepping_past_singlestep_breakpoint
= 0;
1480 deferred_step_ptid
= null_ptid
;
1482 target_last_wait_ptid
= minus_one_ptid
;
1484 previous_inferior_ptid
= null_ptid
;
1485 init_infwait_state ();
1487 displaced_step_clear ();
1491 /* This enum encodes possible reasons for doing a target_wait, so that
1492 wfi can call target_wait in one place. (Ultimately the call will be
1493 moved out of the infinite loop entirely.) */
1497 infwait_normal_state
,
1498 infwait_thread_hop_state
,
1499 infwait_step_watch_state
,
1500 infwait_nonstep_watch_state
1503 /* Why did the inferior stop? Used to print the appropriate messages
1504 to the interface from within handle_inferior_event(). */
1505 enum inferior_stop_reason
1507 /* Step, next, nexti, stepi finished. */
1509 /* Inferior terminated by signal. */
1511 /* Inferior exited. */
1513 /* Inferior received signal, and user asked to be notified. */
1515 /* Reverse execution -- target ran out of history info. */
1519 /* The PTID we'll do a target_wait on.*/
1522 /* Current inferior wait state. */
1523 enum infwait_states infwait_state
;
1525 /* Data to be passed around while handling an event. This data is
1526 discarded between events. */
1527 struct execution_control_state
1530 /* The thread that got the event, if this was a thread event; NULL
1532 struct thread_info
*event_thread
;
1534 struct target_waitstatus ws
;
1536 CORE_ADDR stop_func_start
;
1537 CORE_ADDR stop_func_end
;
1538 char *stop_func_name
;
1539 int new_thread_event
;
1543 void init_execution_control_state (struct execution_control_state
*ecs
);
1545 void handle_inferior_event (struct execution_control_state
*ecs
);
1547 static void handle_step_into_function (struct execution_control_state
*ecs
);
1548 static void handle_step_into_function_backward (struct execution_control_state
*ecs
);
1549 static void insert_step_resume_breakpoint_at_frame (struct frame_info
*step_frame
);
1550 static void insert_step_resume_breakpoint_at_caller (struct frame_info
*);
1551 static void insert_step_resume_breakpoint_at_sal (struct symtab_and_line sr_sal
,
1552 struct frame_id sr_id
);
1553 static void insert_longjmp_resume_breakpoint (CORE_ADDR
);
1555 static void stop_stepping (struct execution_control_state
*ecs
);
1556 static void prepare_to_wait (struct execution_control_state
*ecs
);
1557 static void keep_going (struct execution_control_state
*ecs
);
1558 static void print_stop_reason (enum inferior_stop_reason stop_reason
,
1561 /* Callback for iterate over threads. If the thread is stopped, but
1562 the user/frontend doesn't know about that yet, go through
1563 normal_stop, as if the thread had just stopped now. ARG points at
1564 a ptid. If PTID is MINUS_ONE_PTID, applies to all threads. If
1565 ptid_is_pid(PTID) is true, applies to all threads of the process
1566 pointed at by PTID. Otherwise, apply only to the thread pointed by
1570 infrun_thread_stop_requested_callback (struct thread_info
*info
, void *arg
)
1572 ptid_t ptid
= * (ptid_t
*) arg
;
1574 if ((ptid_equal (info
->ptid
, ptid
)
1575 || ptid_equal (minus_one_ptid
, ptid
)
1576 || (ptid_is_pid (ptid
)
1577 && ptid_get_pid (ptid
) == ptid_get_pid (info
->ptid
)))
1578 && is_running (info
->ptid
)
1579 && !is_executing (info
->ptid
))
1581 struct cleanup
*old_chain
;
1582 struct execution_control_state ecss
;
1583 struct execution_control_state
*ecs
= &ecss
;
1585 memset (ecs
, 0, sizeof (*ecs
));
1587 old_chain
= make_cleanup_restore_current_thread ();
1589 switch_to_thread (info
->ptid
);
1591 /* Go through handle_inferior_event/normal_stop, so we always
1592 have consistent output as if the stop event had been
1594 ecs
->ptid
= info
->ptid
;
1595 ecs
->event_thread
= find_thread_pid (info
->ptid
);
1596 ecs
->ws
.kind
= TARGET_WAITKIND_STOPPED
;
1597 ecs
->ws
.value
.sig
= TARGET_SIGNAL_0
;
1599 handle_inferior_event (ecs
);
1601 if (!ecs
->wait_some_more
)
1603 struct thread_info
*tp
;
1607 /* Finish off the continuations. The continations
1608 themselves are responsible for realising the thread
1609 didn't finish what it was supposed to do. */
1610 tp
= inferior_thread ();
1611 do_all_intermediate_continuations_thread (tp
);
1612 do_all_continuations_thread (tp
);
1615 do_cleanups (old_chain
);
1621 /* This function is attached as a "thread_stop_requested" observer.
1622 Cleanup local state that assumed the PTID was to be resumed, and
1623 report the stop to the frontend. */
1626 infrun_thread_stop_requested (ptid_t ptid
)
1628 struct displaced_step_request
*it
, *next
, *prev
= NULL
;
1630 /* PTID was requested to stop. Remove it from the displaced
1631 stepping queue, so we don't try to resume it automatically. */
1632 for (it
= displaced_step_request_queue
; it
; it
= next
)
1636 if (ptid_equal (it
->ptid
, ptid
)
1637 || ptid_equal (minus_one_ptid
, ptid
)
1638 || (ptid_is_pid (ptid
)
1639 && ptid_get_pid (ptid
) == ptid_get_pid (it
->ptid
)))
1641 if (displaced_step_request_queue
== it
)
1642 displaced_step_request_queue
= it
->next
;
1644 prev
->next
= it
->next
;
1652 iterate_over_threads (infrun_thread_stop_requested_callback
, &ptid
);
1655 /* Callback for iterate_over_threads. */
1658 delete_step_resume_breakpoint_callback (struct thread_info
*info
, void *data
)
1660 if (is_exited (info
->ptid
))
1663 delete_step_resume_breakpoint (info
);
1667 /* In all-stop, delete the step resume breakpoint of any thread that
1668 had one. In non-stop, delete the step resume breakpoint of the
1669 thread that just stopped. */
1672 delete_step_thread_step_resume_breakpoint (void)
1674 if (!target_has_execution
1675 || ptid_equal (inferior_ptid
, null_ptid
))
1676 /* If the inferior has exited, we have already deleted the step
1677 resume breakpoints out of GDB's lists. */
1682 /* If in non-stop mode, only delete the step-resume or
1683 longjmp-resume breakpoint of the thread that just stopped
1685 struct thread_info
*tp
= inferior_thread ();
1686 delete_step_resume_breakpoint (tp
);
1689 /* In all-stop mode, delete all step-resume and longjmp-resume
1690 breakpoints of any thread that had them. */
1691 iterate_over_threads (delete_step_resume_breakpoint_callback
, NULL
);
1694 /* A cleanup wrapper. */
1697 delete_step_thread_step_resume_breakpoint_cleanup (void *arg
)
1699 delete_step_thread_step_resume_breakpoint ();
1702 /* Wait for control to return from inferior to debugger.
1704 If TREAT_EXEC_AS_SIGTRAP is non-zero, then handle EXEC signals
1705 as if they were SIGTRAP signals. This can be useful during
1706 the startup sequence on some targets such as HP/UX, where
1707 we receive an EXEC event instead of the expected SIGTRAP.
1709 If inferior gets a signal, we may decide to start it up again
1710 instead of returning. That is why there is a loop in this function.
1711 When this function actually returns it means the inferior
1712 should be left stopped and GDB should read more commands. */
1715 wait_for_inferior (int treat_exec_as_sigtrap
)
1717 struct cleanup
*old_cleanups
;
1718 struct execution_control_state ecss
;
1719 struct execution_control_state
*ecs
;
1723 (gdb_stdlog
, "infrun: wait_for_inferior (treat_exec_as_sigtrap=%d)\n",
1724 treat_exec_as_sigtrap
);
1727 make_cleanup (delete_step_thread_step_resume_breakpoint_cleanup
, NULL
);
1730 memset (ecs
, 0, sizeof (*ecs
));
1732 overlay_cache_invalid
= 1;
1734 /* We'll update this if & when we switch to a new thread. */
1735 previous_inferior_ptid
= inferior_ptid
;
1737 /* We have to invalidate the registers BEFORE calling target_wait
1738 because they can be loaded from the target while in target_wait.
1739 This makes remote debugging a bit more efficient for those
1740 targets that provide critical registers as part of their normal
1741 status mechanism. */
1743 registers_changed ();
1747 if (deprecated_target_wait_hook
)
1748 ecs
->ptid
= deprecated_target_wait_hook (waiton_ptid
, &ecs
->ws
);
1750 ecs
->ptid
= target_wait (waiton_ptid
, &ecs
->ws
);
1752 if (treat_exec_as_sigtrap
&& ecs
->ws
.kind
== TARGET_WAITKIND_EXECD
)
1754 xfree (ecs
->ws
.value
.execd_pathname
);
1755 ecs
->ws
.kind
= TARGET_WAITKIND_STOPPED
;
1756 ecs
->ws
.value
.sig
= TARGET_SIGNAL_TRAP
;
1759 /* Now figure out what to do with the result of the result. */
1760 handle_inferior_event (ecs
);
1762 if (!ecs
->wait_some_more
)
1766 do_cleanups (old_cleanups
);
1769 /* Asynchronous version of wait_for_inferior. It is called by the
1770 event loop whenever a change of state is detected on the file
1771 descriptor corresponding to the target. It can be called more than
1772 once to complete a single execution command. In such cases we need
1773 to keep the state in a global variable ECSS. If it is the last time
1774 that this function is called for a single execution command, then
1775 report to the user that the inferior has stopped, and do the
1776 necessary cleanups. */
1779 fetch_inferior_event (void *client_data
)
1781 struct execution_control_state ecss
;
1782 struct execution_control_state
*ecs
= &ecss
;
1783 struct cleanup
*old_chain
= make_cleanup (null_cleanup
, NULL
);
1784 int was_sync
= sync_execution
;
1786 memset (ecs
, 0, sizeof (*ecs
));
1788 overlay_cache_invalid
= 1;
1790 /* We can only rely on wait_for_more being correct before handling
1791 the event in all-stop, but previous_inferior_ptid isn't used in
1793 if (!ecs
->wait_some_more
)
1794 /* We'll update this if & when we switch to a new thread. */
1795 previous_inferior_ptid
= inferior_ptid
;
1798 /* In non-stop mode, the user/frontend should not notice a thread
1799 switch due to internal events. Make sure we reverse to the
1800 user selected thread and frame after handling the event and
1801 running any breakpoint commands. */
1802 make_cleanup_restore_current_thread ();
1804 /* We have to invalidate the registers BEFORE calling target_wait
1805 because they can be loaded from the target while in target_wait.
1806 This makes remote debugging a bit more efficient for those
1807 targets that provide critical registers as part of their normal
1808 status mechanism. */
1810 registers_changed ();
1812 if (deprecated_target_wait_hook
)
1814 deprecated_target_wait_hook (waiton_ptid
, &ecs
->ws
);
1816 ecs
->ptid
= target_wait (waiton_ptid
, &ecs
->ws
);
1819 && ecs
->ws
.kind
!= TARGET_WAITKIND_IGNORE
1820 && ecs
->ws
.kind
!= TARGET_WAITKIND_EXITED
1821 && ecs
->ws
.kind
!= TARGET_WAITKIND_SIGNALLED
)
1822 /* In non-stop mode, each thread is handled individually. Switch
1823 early, so the global state is set correctly for this
1825 context_switch (ecs
->ptid
);
1827 /* Now figure out what to do with the result of the result. */
1828 handle_inferior_event (ecs
);
1830 if (!ecs
->wait_some_more
)
1832 struct inferior
*inf
= find_inferior_pid (ptid_get_pid (ecs
->ptid
));
1834 delete_step_thread_step_resume_breakpoint ();
1836 /* We may not find an inferior if this was a process exit. */
1837 if (inf
== NULL
|| inf
->stop_soon
== NO_STOP_QUIETLY
)
1840 if (target_has_execution
1841 && ecs
->ws
.kind
!= TARGET_WAITKIND_EXITED
1842 && ecs
->ws
.kind
!= TARGET_WAITKIND_SIGNALLED
1843 && ecs
->event_thread
->step_multi
1844 && ecs
->event_thread
->stop_step
)
1845 inferior_event_handler (INF_EXEC_CONTINUE
, NULL
);
1847 inferior_event_handler (INF_EXEC_COMPLETE
, NULL
);
1850 /* Revert thread and frame. */
1851 do_cleanups (old_chain
);
1853 /* If the inferior was in sync execution mode, and now isn't,
1854 restore the prompt. */
1855 if (was_sync
&& !sync_execution
)
1856 display_gdb_prompt (0);
1859 /* Prepare an execution control state for looping through a
1860 wait_for_inferior-type loop. */
1863 init_execution_control_state (struct execution_control_state
*ecs
)
1865 ecs
->random_signal
= 0;
1868 /* Clear context switchable stepping state. */
1871 init_thread_stepping_state (struct thread_info
*tss
)
1873 struct symtab_and_line sal
;
1875 tss
->stepping_over_breakpoint
= 0;
1876 tss
->step_after_step_resume_breakpoint
= 0;
1877 tss
->stepping_through_solib_after_catch
= 0;
1878 tss
->stepping_through_solib_catchpoints
= NULL
;
1880 sal
= find_pc_line (tss
->prev_pc
, 0);
1881 tss
->current_line
= sal
.line
;
1882 tss
->current_symtab
= sal
.symtab
;
1885 /* Return the cached copy of the last pid/waitstatus returned by
1886 target_wait()/deprecated_target_wait_hook(). The data is actually
1887 cached by handle_inferior_event(), which gets called immediately
1888 after target_wait()/deprecated_target_wait_hook(). */
1891 get_last_target_status (ptid_t
*ptidp
, struct target_waitstatus
*status
)
1893 *ptidp
= target_last_wait_ptid
;
1894 *status
= target_last_waitstatus
;
1898 nullify_last_target_wait_ptid (void)
1900 target_last_wait_ptid
= minus_one_ptid
;
1903 /* Switch thread contexts. */
1906 context_switch (ptid_t ptid
)
1910 fprintf_unfiltered (gdb_stdlog
, "infrun: Switching context from %s ",
1911 target_pid_to_str (inferior_ptid
));
1912 fprintf_unfiltered (gdb_stdlog
, "to %s\n",
1913 target_pid_to_str (ptid
));
1916 switch_to_thread (ptid
);
1920 adjust_pc_after_break (struct execution_control_state
*ecs
)
1922 struct regcache
*regcache
;
1923 struct gdbarch
*gdbarch
;
1924 CORE_ADDR breakpoint_pc
;
1926 /* If we've hit a breakpoint, we'll normally be stopped with SIGTRAP. If
1927 we aren't, just return.
1929 We assume that waitkinds other than TARGET_WAITKIND_STOPPED are not
1930 affected by gdbarch_decr_pc_after_break. Other waitkinds which are
1931 implemented by software breakpoints should be handled through the normal
1934 NOTE drow/2004-01-31: On some targets, breakpoints may generate
1935 different signals (SIGILL or SIGEMT for instance), but it is less
1936 clear where the PC is pointing afterwards. It may not match
1937 gdbarch_decr_pc_after_break. I don't know any specific target that
1938 generates these signals at breakpoints (the code has been in GDB since at
1939 least 1992) so I can not guess how to handle them here.
1941 In earlier versions of GDB, a target with
1942 gdbarch_have_nonsteppable_watchpoint would have the PC after hitting a
1943 watchpoint affected by gdbarch_decr_pc_after_break. I haven't found any
1944 target with both of these set in GDB history, and it seems unlikely to be
1945 correct, so gdbarch_have_nonsteppable_watchpoint is not checked here. */
1947 if (ecs
->ws
.kind
!= TARGET_WAITKIND_STOPPED
)
1950 if (ecs
->ws
.value
.sig
!= TARGET_SIGNAL_TRAP
)
1953 /* In reverse execution, when a breakpoint is hit, the instruction
1954 under it has already been de-executed. The reported PC always
1955 points at the breakpoint address, so adjusting it further would
1956 be wrong. E.g., consider this case on a decr_pc_after_break == 1
1959 B1 0x08000000 : INSN1
1960 B2 0x08000001 : INSN2
1962 PC -> 0x08000003 : INSN4
1964 Say you're stopped at 0x08000003 as above. Reverse continuing
1965 from that point should hit B2 as below. Reading the PC when the
1966 SIGTRAP is reported should read 0x08000001 and INSN2 should have
1967 been de-executed already.
1969 B1 0x08000000 : INSN1
1970 B2 PC -> 0x08000001 : INSN2
1974 We can't apply the same logic as for forward execution, because
1975 we would wrongly adjust the PC to 0x08000000, since there's a
1976 breakpoint at PC - 1. We'd then report a hit on B1, although
1977 INSN1 hadn't been de-executed yet. Doing nothing is the correct
1979 if (execution_direction
== EXEC_REVERSE
)
1982 /* If this target does not decrement the PC after breakpoints, then
1983 we have nothing to do. */
1984 regcache
= get_thread_regcache (ecs
->ptid
);
1985 gdbarch
= get_regcache_arch (regcache
);
1986 if (gdbarch_decr_pc_after_break (gdbarch
) == 0)
1989 /* Find the location where (if we've hit a breakpoint) the
1990 breakpoint would be. */
1991 breakpoint_pc
= regcache_read_pc (regcache
)
1992 - gdbarch_decr_pc_after_break (gdbarch
);
1994 /* Check whether there actually is a software breakpoint inserted at
1997 If in non-stop mode, a race condition is possible where we've
1998 removed a breakpoint, but stop events for that breakpoint were
1999 already queued and arrive later. To suppress those spurious
2000 SIGTRAPs, we keep a list of such breakpoint locations for a bit,
2001 and retire them after a number of stop events are reported. */
2002 if (software_breakpoint_inserted_here_p (breakpoint_pc
)
2003 || (non_stop
&& moribund_breakpoint_here_p (breakpoint_pc
)))
2005 /* When using hardware single-step, a SIGTRAP is reported for both
2006 a completed single-step and a software breakpoint. Need to
2007 differentiate between the two, as the latter needs adjusting
2008 but the former does not.
2010 The SIGTRAP can be due to a completed hardware single-step only if
2011 - we didn't insert software single-step breakpoints
2012 - the thread to be examined is still the current thread
2013 - this thread is currently being stepped
2015 If any of these events did not occur, we must have stopped due
2016 to hitting a software breakpoint, and have to back up to the
2019 As a special case, we could have hardware single-stepped a
2020 software breakpoint. In this case (prev_pc == breakpoint_pc),
2021 we also need to back up to the breakpoint address. */
2023 if (singlestep_breakpoints_inserted_p
2024 || !ptid_equal (ecs
->ptid
, inferior_ptid
)
2025 || !currently_stepping (ecs
->event_thread
)
2026 || ecs
->event_thread
->prev_pc
== breakpoint_pc
)
2027 regcache_write_pc (regcache
, breakpoint_pc
);
2032 init_infwait_state (void)
2034 waiton_ptid
= pid_to_ptid (-1);
2035 infwait_state
= infwait_normal_state
;
2039 error_is_running (void)
2042 Cannot execute this command while the selected thread is running."));
2046 ensure_not_running (void)
2048 if (is_running (inferior_ptid
))
2049 error_is_running ();
2052 /* Given an execution control state that has been freshly filled in
2053 by an event from the inferior, figure out what it means and take
2054 appropriate action. */
2057 handle_inferior_event (struct execution_control_state
*ecs
)
2059 int sw_single_step_trap_p
= 0;
2060 int stopped_by_watchpoint
;
2061 int stepped_after_stopped_by_watchpoint
= 0;
2062 struct symtab_and_line stop_pc_sal
;
2063 enum stop_kind stop_soon
;
2065 if (ecs
->ws
.kind
!= TARGET_WAITKIND_EXITED
2066 && ecs
->ws
.kind
!= TARGET_WAITKIND_SIGNALLED
2067 && ecs
->ws
.kind
!= TARGET_WAITKIND_IGNORE
)
2069 struct inferior
*inf
= find_inferior_pid (ptid_get_pid (ecs
->ptid
));
2071 stop_soon
= inf
->stop_soon
;
2074 stop_soon
= NO_STOP_QUIETLY
;
2076 /* Cache the last pid/waitstatus. */
2077 target_last_wait_ptid
= ecs
->ptid
;
2078 target_last_waitstatus
= ecs
->ws
;
2080 /* Always clear state belonging to the previous time we stopped. */
2081 stop_stack_dummy
= 0;
2083 /* If it's a new process, add it to the thread database */
2085 ecs
->new_thread_event
= (!ptid_equal (ecs
->ptid
, inferior_ptid
)
2086 && !ptid_equal (ecs
->ptid
, minus_one_ptid
)
2087 && !in_thread_list (ecs
->ptid
));
2089 if (ecs
->ws
.kind
!= TARGET_WAITKIND_EXITED
2090 && ecs
->ws
.kind
!= TARGET_WAITKIND_SIGNALLED
&& ecs
->new_thread_event
)
2091 add_thread (ecs
->ptid
);
2093 ecs
->event_thread
= find_thread_pid (ecs
->ptid
);
2095 /* Dependent on valid ECS->EVENT_THREAD. */
2096 adjust_pc_after_break (ecs
);
2098 /* Dependent on the current PC value modified by adjust_pc_after_break. */
2099 reinit_frame_cache ();
2101 if (ecs
->ws
.kind
!= TARGET_WAITKIND_IGNORE
)
2103 breakpoint_retire_moribund ();
2105 /* Mark the non-executing threads accordingly. */
2107 || ecs
->ws
.kind
== TARGET_WAITKIND_EXITED
2108 || ecs
->ws
.kind
== TARGET_WAITKIND_SIGNALLED
)
2109 set_executing (pid_to_ptid (-1), 0);
2111 set_executing (ecs
->ptid
, 0);
2114 switch (infwait_state
)
2116 case infwait_thread_hop_state
:
2118 fprintf_unfiltered (gdb_stdlog
, "infrun: infwait_thread_hop_state\n");
2119 /* Cancel the waiton_ptid. */
2120 waiton_ptid
= pid_to_ptid (-1);
2123 case infwait_normal_state
:
2125 fprintf_unfiltered (gdb_stdlog
, "infrun: infwait_normal_state\n");
2128 case infwait_step_watch_state
:
2130 fprintf_unfiltered (gdb_stdlog
,
2131 "infrun: infwait_step_watch_state\n");
2133 stepped_after_stopped_by_watchpoint
= 1;
2136 case infwait_nonstep_watch_state
:
2138 fprintf_unfiltered (gdb_stdlog
,
2139 "infrun: infwait_nonstep_watch_state\n");
2140 insert_breakpoints ();
2142 /* FIXME-maybe: is this cleaner than setting a flag? Does it
2143 handle things like signals arriving and other things happening
2144 in combination correctly? */
2145 stepped_after_stopped_by_watchpoint
= 1;
2149 internal_error (__FILE__
, __LINE__
, _("bad switch"));
2151 infwait_state
= infwait_normal_state
;
2153 switch (ecs
->ws
.kind
)
2155 case TARGET_WAITKIND_LOADED
:
2157 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_LOADED\n");
2158 /* Ignore gracefully during startup of the inferior, as it might
2159 be the shell which has just loaded some objects, otherwise
2160 add the symbols for the newly loaded objects. Also ignore at
2161 the beginning of an attach or remote session; we will query
2162 the full list of libraries once the connection is
2164 if (stop_soon
== NO_STOP_QUIETLY
)
2166 /* Check for any newly added shared libraries if we're
2167 supposed to be adding them automatically. Switch
2168 terminal for any messages produced by
2169 breakpoint_re_set. */
2170 target_terminal_ours_for_output ();
2171 /* NOTE: cagney/2003-11-25: Make certain that the target
2172 stack's section table is kept up-to-date. Architectures,
2173 (e.g., PPC64), use the section table to perform
2174 operations such as address => section name and hence
2175 require the table to contain all sections (including
2176 those found in shared libraries). */
2177 /* NOTE: cagney/2003-11-25: Pass current_target and not
2178 exec_ops to SOLIB_ADD. This is because current GDB is
2179 only tooled to propagate section_table changes out from
2180 the "current_target" (see target_resize_to_sections), and
2181 not up from the exec stratum. This, of course, isn't
2182 right. "infrun.c" should only interact with the
2183 exec/process stratum, instead relying on the target stack
2184 to propagate relevant changes (stop, section table
2185 changed, ...) up to other layers. */
2187 SOLIB_ADD (NULL
, 0, ¤t_target
, auto_solib_add
);
2189 solib_add (NULL
, 0, ¤t_target
, auto_solib_add
);
2191 target_terminal_inferior ();
2193 /* If requested, stop when the dynamic linker notifies
2194 gdb of events. This allows the user to get control
2195 and place breakpoints in initializer routines for
2196 dynamically loaded objects (among other things). */
2197 if (stop_on_solib_events
)
2199 stop_stepping (ecs
);
2203 /* NOTE drow/2007-05-11: This might be a good place to check
2204 for "catch load". */
2207 /* If we are skipping through a shell, or through shared library
2208 loading that we aren't interested in, resume the program. If
2209 we're running the program normally, also resume. But stop if
2210 we're attaching or setting up a remote connection. */
2211 if (stop_soon
== STOP_QUIETLY
|| stop_soon
== NO_STOP_QUIETLY
)
2213 /* Loading of shared libraries might have changed breakpoint
2214 addresses. Make sure new breakpoints are inserted. */
2215 if (stop_soon
== NO_STOP_QUIETLY
2216 && !breakpoints_always_inserted_mode ())
2217 insert_breakpoints ();
2218 resume (0, TARGET_SIGNAL_0
);
2219 prepare_to_wait (ecs
);
2225 case TARGET_WAITKIND_SPURIOUS
:
2227 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_SPURIOUS\n");
2228 resume (0, TARGET_SIGNAL_0
);
2229 prepare_to_wait (ecs
);
2232 case TARGET_WAITKIND_EXITED
:
2234 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_EXITED\n");
2235 target_terminal_ours (); /* Must do this before mourn anyway */
2236 print_stop_reason (EXITED
, ecs
->ws
.value
.integer
);
2238 /* Record the exit code in the convenience variable $_exitcode, so
2239 that the user can inspect this again later. */
2240 set_internalvar (lookup_internalvar ("_exitcode"),
2241 value_from_longest (builtin_type_int32
,
2242 (LONGEST
) ecs
->ws
.value
.integer
));
2243 gdb_flush (gdb_stdout
);
2244 target_mourn_inferior ();
2245 singlestep_breakpoints_inserted_p
= 0;
2246 stop_print_frame
= 0;
2247 stop_stepping (ecs
);
2250 case TARGET_WAITKIND_SIGNALLED
:
2252 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_SIGNALLED\n");
2253 stop_print_frame
= 0;
2254 target_terminal_ours (); /* Must do this before mourn anyway */
2256 /* Note: By definition of TARGET_WAITKIND_SIGNALLED, we shouldn't
2257 reach here unless the inferior is dead. However, for years
2258 target_kill() was called here, which hints that fatal signals aren't
2259 really fatal on some systems. If that's true, then some changes
2261 target_mourn_inferior ();
2263 print_stop_reason (SIGNAL_EXITED
, ecs
->ws
.value
.sig
);
2264 singlestep_breakpoints_inserted_p
= 0;
2265 stop_stepping (ecs
);
2268 /* The following are the only cases in which we keep going;
2269 the above cases end in a continue or goto. */
2270 case TARGET_WAITKIND_FORKED
:
2271 case TARGET_WAITKIND_VFORKED
:
2273 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_FORKED\n");
2274 pending_follow
.kind
= ecs
->ws
.kind
;
2276 pending_follow
.fork_event
.parent_pid
= ecs
->ptid
;
2277 pending_follow
.fork_event
.child_pid
= ecs
->ws
.value
.related_pid
;
2279 if (!ptid_equal (ecs
->ptid
, inferior_ptid
))
2281 context_switch (ecs
->ptid
);
2282 reinit_frame_cache ();
2285 stop_pc
= read_pc ();
2287 ecs
->event_thread
->stop_bpstat
= bpstat_stop_status (stop_pc
, ecs
->ptid
);
2289 ecs
->random_signal
= !bpstat_explains_signal (ecs
->event_thread
->stop_bpstat
);
2291 /* If no catchpoint triggered for this, then keep going. */
2292 if (ecs
->random_signal
)
2294 ecs
->event_thread
->stop_signal
= TARGET_SIGNAL_0
;
2298 ecs
->event_thread
->stop_signal
= TARGET_SIGNAL_TRAP
;
2299 goto process_event_stop_test
;
2301 case TARGET_WAITKIND_EXECD
:
2303 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_EXECD\n");
2304 pending_follow
.execd_pathname
=
2305 savestring (ecs
->ws
.value
.execd_pathname
,
2306 strlen (ecs
->ws
.value
.execd_pathname
));
2308 if (!ptid_equal (ecs
->ptid
, inferior_ptid
))
2310 context_switch (ecs
->ptid
);
2311 reinit_frame_cache ();
2314 stop_pc
= read_pc ();
2316 /* This causes the eventpoints and symbol table to be reset.
2317 Must do this now, before trying to determine whether to
2319 follow_exec (inferior_ptid
, pending_follow
.execd_pathname
);
2320 xfree (pending_follow
.execd_pathname
);
2322 ecs
->event_thread
->stop_bpstat
= bpstat_stop_status (stop_pc
, ecs
->ptid
);
2323 ecs
->random_signal
= !bpstat_explains_signal (ecs
->event_thread
->stop_bpstat
);
2325 /* If no catchpoint triggered for this, then keep going. */
2326 if (ecs
->random_signal
)
2328 ecs
->event_thread
->stop_signal
= TARGET_SIGNAL_0
;
2332 ecs
->event_thread
->stop_signal
= TARGET_SIGNAL_TRAP
;
2333 goto process_event_stop_test
;
2335 /* Be careful not to try to gather much state about a thread
2336 that's in a syscall. It's frequently a losing proposition. */
2337 case TARGET_WAITKIND_SYSCALL_ENTRY
:
2339 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_SYSCALL_ENTRY\n");
2340 resume (0, TARGET_SIGNAL_0
);
2341 prepare_to_wait (ecs
);
2344 /* Before examining the threads further, step this thread to
2345 get it entirely out of the syscall. (We get notice of the
2346 event when the thread is just on the verge of exiting a
2347 syscall. Stepping one instruction seems to get it back
2349 case TARGET_WAITKIND_SYSCALL_RETURN
:
2351 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_SYSCALL_RETURN\n");
2352 target_resume (ecs
->ptid
, 1, TARGET_SIGNAL_0
);
2353 prepare_to_wait (ecs
);
2356 case TARGET_WAITKIND_STOPPED
:
2358 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_STOPPED\n");
2359 ecs
->event_thread
->stop_signal
= ecs
->ws
.value
.sig
;
2362 case TARGET_WAITKIND_NO_HISTORY
:
2363 /* Reverse execution: target ran out of history info. */
2364 stop_pc
= read_pc ();
2365 print_stop_reason (NO_HISTORY
, 0);
2366 stop_stepping (ecs
);
2369 /* We had an event in the inferior, but we are not interested
2370 in handling it at this level. The lower layers have already
2371 done what needs to be done, if anything.
2373 One of the possible circumstances for this is when the
2374 inferior produces output for the console. The inferior has
2375 not stopped, and we are ignoring the event. Another possible
2376 circumstance is any event which the lower level knows will be
2377 reported multiple times without an intervening resume. */
2378 case TARGET_WAITKIND_IGNORE
:
2380 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_IGNORE\n");
2381 prepare_to_wait (ecs
);
2385 if (ecs
->new_thread_event
)
2388 /* Non-stop assumes that the target handles adding new threads
2389 to the thread list. */
2390 internal_error (__FILE__
, __LINE__
, "\
2391 targets should add new threads to the thread list themselves in non-stop mode.");
2393 /* We may want to consider not doing a resume here in order to
2394 give the user a chance to play with the new thread. It might
2395 be good to make that a user-settable option. */
2397 /* At this point, all threads are stopped (happens automatically
2398 in either the OS or the native code). Therefore we need to
2399 continue all threads in order to make progress. */
2401 target_resume (RESUME_ALL
, 0, TARGET_SIGNAL_0
);
2402 prepare_to_wait (ecs
);
2406 if (ecs
->ws
.kind
== TARGET_WAITKIND_STOPPED
)
2408 /* Do we need to clean up the state of a thread that has
2409 completed a displaced single-step? (Doing so usually affects
2410 the PC, so do it here, before we set stop_pc.) */
2411 displaced_step_fixup (ecs
->ptid
, ecs
->event_thread
->stop_signal
);
2413 /* If we either finished a single-step or hit a breakpoint, but
2414 the user wanted this thread to be stopped, pretend we got a
2415 SIG0 (generic unsignaled stop). */
2417 if (ecs
->event_thread
->stop_requested
2418 && ecs
->event_thread
->stop_signal
== TARGET_SIGNAL_TRAP
)
2419 ecs
->event_thread
->stop_signal
= TARGET_SIGNAL_0
;
2422 stop_pc
= regcache_read_pc (get_thread_regcache (ecs
->ptid
));
2426 fprintf_unfiltered (gdb_stdlog
, "infrun: stop_pc = 0x%s\n",
2427 paddr_nz (stop_pc
));
2428 if (STOPPED_BY_WATCHPOINT (&ecs
->ws
))
2431 fprintf_unfiltered (gdb_stdlog
, "infrun: stopped by watchpoint\n");
2433 if (target_stopped_data_address (¤t_target
, &addr
))
2434 fprintf_unfiltered (gdb_stdlog
,
2435 "infrun: stopped data address = 0x%s\n",
2438 fprintf_unfiltered (gdb_stdlog
,
2439 "infrun: (no data address available)\n");
2443 if (stepping_past_singlestep_breakpoint
)
2445 gdb_assert (singlestep_breakpoints_inserted_p
);
2446 gdb_assert (ptid_equal (singlestep_ptid
, ecs
->ptid
));
2447 gdb_assert (!ptid_equal (singlestep_ptid
, saved_singlestep_ptid
));
2449 stepping_past_singlestep_breakpoint
= 0;
2451 /* We've either finished single-stepping past the single-step
2452 breakpoint, or stopped for some other reason. It would be nice if
2453 we could tell, but we can't reliably. */
2454 if (ecs
->event_thread
->stop_signal
== TARGET_SIGNAL_TRAP
)
2457 fprintf_unfiltered (gdb_stdlog
, "infrun: stepping_past_singlestep_breakpoint\n");
2458 /* Pull the single step breakpoints out of the target. */
2459 remove_single_step_breakpoints ();
2460 singlestep_breakpoints_inserted_p
= 0;
2462 ecs
->random_signal
= 0;
2464 context_switch (saved_singlestep_ptid
);
2465 if (deprecated_context_hook
)
2466 deprecated_context_hook (pid_to_thread_id (ecs
->ptid
));
2468 resume (1, TARGET_SIGNAL_0
);
2469 prepare_to_wait (ecs
);
2474 stepping_past_singlestep_breakpoint
= 0;
2476 if (!ptid_equal (deferred_step_ptid
, null_ptid
))
2478 /* In non-stop mode, there's never a deferred_step_ptid set. */
2479 gdb_assert (!non_stop
);
2481 /* If we stopped for some other reason than single-stepping, ignore
2482 the fact that we were supposed to switch back. */
2483 if (ecs
->event_thread
->stop_signal
== TARGET_SIGNAL_TRAP
)
2485 struct thread_info
*tp
;
2488 fprintf_unfiltered (gdb_stdlog
,
2489 "infrun: handling deferred step\n");
2491 /* Pull the single step breakpoints out of the target. */
2492 if (singlestep_breakpoints_inserted_p
)
2494 remove_single_step_breakpoints ();
2495 singlestep_breakpoints_inserted_p
= 0;
2498 /* Note: We do not call context_switch at this point, as the
2499 context is already set up for stepping the original thread. */
2500 switch_to_thread (deferred_step_ptid
);
2501 deferred_step_ptid
= null_ptid
;
2502 /* Suppress spurious "Switching to ..." message. */
2503 previous_inferior_ptid
= inferior_ptid
;
2505 resume (1, TARGET_SIGNAL_0
);
2506 prepare_to_wait (ecs
);
2510 deferred_step_ptid
= null_ptid
;
2513 /* See if a thread hit a thread-specific breakpoint that was meant for
2514 another thread. If so, then step that thread past the breakpoint,
2517 if (ecs
->event_thread
->stop_signal
== TARGET_SIGNAL_TRAP
)
2519 int thread_hop_needed
= 0;
2521 /* Check if a regular breakpoint has been hit before checking
2522 for a potential single step breakpoint. Otherwise, GDB will
2523 not see this breakpoint hit when stepping onto breakpoints. */
2524 if (regular_breakpoint_inserted_here_p (stop_pc
))
2526 ecs
->random_signal
= 0;
2527 if (!breakpoint_thread_match (stop_pc
, ecs
->ptid
))
2528 thread_hop_needed
= 1;
2530 else if (singlestep_breakpoints_inserted_p
)
2532 /* We have not context switched yet, so this should be true
2533 no matter which thread hit the singlestep breakpoint. */
2534 gdb_assert (ptid_equal (inferior_ptid
, singlestep_ptid
));
2536 fprintf_unfiltered (gdb_stdlog
, "infrun: software single step "
2538 target_pid_to_str (ecs
->ptid
));
2540 ecs
->random_signal
= 0;
2541 /* The call to in_thread_list is necessary because PTIDs sometimes
2542 change when we go from single-threaded to multi-threaded. If
2543 the singlestep_ptid is still in the list, assume that it is
2544 really different from ecs->ptid. */
2545 if (!ptid_equal (singlestep_ptid
, ecs
->ptid
)
2546 && in_thread_list (singlestep_ptid
))
2548 /* If the PC of the thread we were trying to single-step
2549 has changed, discard this event (which we were going
2550 to ignore anyway), and pretend we saw that thread
2551 trap. This prevents us continuously moving the
2552 single-step breakpoint forward, one instruction at a
2553 time. If the PC has changed, then the thread we were
2554 trying to single-step has trapped or been signalled,
2555 but the event has not been reported to GDB yet.
2557 There might be some cases where this loses signal
2558 information, if a signal has arrived at exactly the
2559 same time that the PC changed, but this is the best
2560 we can do with the information available. Perhaps we
2561 should arrange to report all events for all threads
2562 when they stop, or to re-poll the remote looking for
2563 this particular thread (i.e. temporarily enable
2566 CORE_ADDR new_singlestep_pc
2567 = regcache_read_pc (get_thread_regcache (singlestep_ptid
));
2569 if (new_singlestep_pc
!= singlestep_pc
)
2571 enum target_signal stop_signal
;
2574 fprintf_unfiltered (gdb_stdlog
, "infrun: unexpected thread,"
2575 " but expected thread advanced also\n");
2577 /* The current context still belongs to
2578 singlestep_ptid. Don't swap here, since that's
2579 the context we want to use. Just fudge our
2580 state and continue. */
2581 stop_signal
= ecs
->event_thread
->stop_signal
;
2582 ecs
->event_thread
->stop_signal
= TARGET_SIGNAL_0
;
2583 ecs
->ptid
= singlestep_ptid
;
2584 ecs
->event_thread
= find_thread_pid (ecs
->ptid
);
2585 ecs
->event_thread
->stop_signal
= stop_signal
;
2586 stop_pc
= new_singlestep_pc
;
2591 fprintf_unfiltered (gdb_stdlog
,
2592 "infrun: unexpected thread\n");
2594 thread_hop_needed
= 1;
2595 stepping_past_singlestep_breakpoint
= 1;
2596 saved_singlestep_ptid
= singlestep_ptid
;
2601 if (thread_hop_needed
)
2603 int remove_status
= 0;
2606 fprintf_unfiltered (gdb_stdlog
, "infrun: thread_hop_needed\n");
2608 /* Saw a breakpoint, but it was hit by the wrong thread.
2611 if (singlestep_breakpoints_inserted_p
)
2613 /* Pull the single step breakpoints out of the target. */
2614 remove_single_step_breakpoints ();
2615 singlestep_breakpoints_inserted_p
= 0;
2618 /* If the arch can displace step, don't remove the
2620 if (!use_displaced_stepping (current_gdbarch
))
2621 remove_status
= remove_breakpoints ();
2623 /* Did we fail to remove breakpoints? If so, try
2624 to set the PC past the bp. (There's at least
2625 one situation in which we can fail to remove
2626 the bp's: On HP-UX's that use ttrace, we can't
2627 change the address space of a vforking child
2628 process until the child exits (well, okay, not
2629 then either :-) or execs. */
2630 if (remove_status
!= 0)
2631 error (_("Cannot step over breakpoint hit in wrong thread"));
2634 if (!ptid_equal (inferior_ptid
, ecs
->ptid
))
2635 context_switch (ecs
->ptid
);
2639 /* Only need to require the next event from this
2640 thread in all-stop mode. */
2641 waiton_ptid
= ecs
->ptid
;
2642 infwait_state
= infwait_thread_hop_state
;
2645 ecs
->event_thread
->stepping_over_breakpoint
= 1;
2647 registers_changed ();
2651 else if (singlestep_breakpoints_inserted_p
)
2653 sw_single_step_trap_p
= 1;
2654 ecs
->random_signal
= 0;
2658 ecs
->random_signal
= 1;
2660 /* See if something interesting happened to the non-current thread. If
2661 so, then switch to that thread. */
2662 if (!ptid_equal (ecs
->ptid
, inferior_ptid
))
2665 fprintf_unfiltered (gdb_stdlog
, "infrun: context switch\n");
2667 context_switch (ecs
->ptid
);
2669 if (deprecated_context_hook
)
2670 deprecated_context_hook (pid_to_thread_id (ecs
->ptid
));
2673 if (singlestep_breakpoints_inserted_p
)
2675 /* Pull the single step breakpoints out of the target. */
2676 remove_single_step_breakpoints ();
2677 singlestep_breakpoints_inserted_p
= 0;
2680 if (stepped_after_stopped_by_watchpoint
)
2681 stopped_by_watchpoint
= 0;
2683 stopped_by_watchpoint
= watchpoints_triggered (&ecs
->ws
);
2685 /* If necessary, step over this watchpoint. We'll be back to display
2687 if (stopped_by_watchpoint
2688 && (HAVE_STEPPABLE_WATCHPOINT
2689 || gdbarch_have_nonsteppable_watchpoint (current_gdbarch
)))
2691 /* At this point, we are stopped at an instruction which has
2692 attempted to write to a piece of memory under control of
2693 a watchpoint. The instruction hasn't actually executed
2694 yet. If we were to evaluate the watchpoint expression
2695 now, we would get the old value, and therefore no change
2696 would seem to have occurred.
2698 In order to make watchpoints work `right', we really need
2699 to complete the memory write, and then evaluate the
2700 watchpoint expression. We do this by single-stepping the
2703 It may not be necessary to disable the watchpoint to stop over
2704 it. For example, the PA can (with some kernel cooperation)
2705 single step over a watchpoint without disabling the watchpoint.
2707 It is far more common to need to disable a watchpoint to step
2708 the inferior over it. If we have non-steppable watchpoints,
2709 we must disable the current watchpoint; it's simplest to
2710 disable all watchpoints and breakpoints. */
2712 if (!HAVE_STEPPABLE_WATCHPOINT
)
2713 remove_breakpoints ();
2714 registers_changed ();
2715 target_resume (ecs
->ptid
, 1, TARGET_SIGNAL_0
); /* Single step */
2716 waiton_ptid
= ecs
->ptid
;
2717 if (HAVE_STEPPABLE_WATCHPOINT
)
2718 infwait_state
= infwait_step_watch_state
;
2720 infwait_state
= infwait_nonstep_watch_state
;
2721 prepare_to_wait (ecs
);
2725 ecs
->stop_func_start
= 0;
2726 ecs
->stop_func_end
= 0;
2727 ecs
->stop_func_name
= 0;
2728 /* Don't care about return value; stop_func_start and stop_func_name
2729 will both be 0 if it doesn't work. */
2730 find_pc_partial_function (stop_pc
, &ecs
->stop_func_name
,
2731 &ecs
->stop_func_start
, &ecs
->stop_func_end
);
2732 ecs
->stop_func_start
2733 += gdbarch_deprecated_function_start_offset (current_gdbarch
);
2734 ecs
->event_thread
->stepping_over_breakpoint
= 0;
2735 bpstat_clear (&ecs
->event_thread
->stop_bpstat
);
2736 ecs
->event_thread
->stop_step
= 0;
2737 stop_print_frame
= 1;
2738 ecs
->random_signal
= 0;
2739 stopped_by_random_signal
= 0;
2741 if (ecs
->event_thread
->stop_signal
== TARGET_SIGNAL_TRAP
2742 && ecs
->event_thread
->trap_expected
2743 && gdbarch_single_step_through_delay_p (current_gdbarch
)
2744 && currently_stepping (ecs
->event_thread
))
2746 /* We're trying to step off a breakpoint. Turns out that we're
2747 also on an instruction that needs to be stepped multiple
2748 times before it's been fully executing. E.g., architectures
2749 with a delay slot. It needs to be stepped twice, once for
2750 the instruction and once for the delay slot. */
2751 int step_through_delay
2752 = gdbarch_single_step_through_delay (current_gdbarch
,
2753 get_current_frame ());
2754 if (debug_infrun
&& step_through_delay
)
2755 fprintf_unfiltered (gdb_stdlog
, "infrun: step through delay\n");
2756 if (ecs
->event_thread
->step_range_end
== 0 && step_through_delay
)
2758 /* The user issued a continue when stopped at a breakpoint.
2759 Set up for another trap and get out of here. */
2760 ecs
->event_thread
->stepping_over_breakpoint
= 1;
2764 else if (step_through_delay
)
2766 /* The user issued a step when stopped at a breakpoint.
2767 Maybe we should stop, maybe we should not - the delay
2768 slot *might* correspond to a line of source. In any
2769 case, don't decide that here, just set
2770 ecs->stepping_over_breakpoint, making sure we
2771 single-step again before breakpoints are re-inserted. */
2772 ecs
->event_thread
->stepping_over_breakpoint
= 1;
2776 /* Look at the cause of the stop, and decide what to do.
2777 The alternatives are:
2778 1) stop_stepping and return; to really stop and return to the debugger,
2779 2) keep_going and return to start up again
2780 (set ecs->event_thread->stepping_over_breakpoint to 1 to single step once)
2781 3) set ecs->random_signal to 1, and the decision between 1 and 2
2782 will be made according to the signal handling tables. */
2784 /* First, distinguish signals caused by the debugger from signals
2785 that have to do with the program's own actions. Note that
2786 breakpoint insns may cause SIGTRAP or SIGILL or SIGEMT, depending
2787 on the operating system version. Here we detect when a SIGILL or
2788 SIGEMT is really a breakpoint and change it to SIGTRAP. We do
2789 something similar for SIGSEGV, since a SIGSEGV will be generated
2790 when we're trying to execute a breakpoint instruction on a
2791 non-executable stack. This happens for call dummy breakpoints
2792 for architectures like SPARC that place call dummies on the
2795 If we're doing a displaced step past a breakpoint, then the
2796 breakpoint is always inserted at the original instruction;
2797 non-standard signals can't be explained by the breakpoint. */
2798 if (ecs
->event_thread
->stop_signal
== TARGET_SIGNAL_TRAP
2799 || (! ecs
->event_thread
->trap_expected
2800 && breakpoint_inserted_here_p (stop_pc
)
2801 && (ecs
->event_thread
->stop_signal
== TARGET_SIGNAL_ILL
2802 || ecs
->event_thread
->stop_signal
== TARGET_SIGNAL_SEGV
2803 || ecs
->event_thread
->stop_signal
== TARGET_SIGNAL_EMT
))
2804 || stop_soon
== STOP_QUIETLY
|| stop_soon
== STOP_QUIETLY_NO_SIGSTOP
2805 || stop_soon
== STOP_QUIETLY_REMOTE
)
2807 if (ecs
->event_thread
->stop_signal
== TARGET_SIGNAL_TRAP
&& stop_after_trap
)
2810 fprintf_unfiltered (gdb_stdlog
, "infrun: stopped\n");
2811 stop_print_frame
= 0;
2812 stop_stepping (ecs
);
2816 /* This is originated from start_remote(), start_inferior() and
2817 shared libraries hook functions. */
2818 if (stop_soon
== STOP_QUIETLY
|| stop_soon
== STOP_QUIETLY_REMOTE
)
2821 fprintf_unfiltered (gdb_stdlog
, "infrun: quietly stopped\n");
2822 stop_stepping (ecs
);
2826 /* This originates from attach_command(). We need to overwrite
2827 the stop_signal here, because some kernels don't ignore a
2828 SIGSTOP in a subsequent ptrace(PTRACE_CONT,SIGSTOP) call.
2829 See more comments in inferior.h. On the other hand, if we
2830 get a non-SIGSTOP, report it to the user - assume the backend
2831 will handle the SIGSTOP if it should show up later.
2833 Also consider that the attach is complete when we see a
2834 SIGTRAP. Some systems (e.g. Windows), and stubs supporting
2835 target extended-remote report it instead of a SIGSTOP
2836 (e.g. gdbserver). We already rely on SIGTRAP being our
2837 signal, so this is no exception.
2839 Also consider that the attach is complete when we see a
2840 TARGET_SIGNAL_0. In non-stop mode, GDB will explicitly tell
2841 the target to stop all threads of the inferior, in case the
2842 low level attach operation doesn't stop them implicitly. If
2843 they weren't stopped implicitly, then the stub will report a
2844 TARGET_SIGNAL_0, meaning: stopped for no particular reason
2845 other than GDB's request. */
2846 if (stop_soon
== STOP_QUIETLY_NO_SIGSTOP
2847 && (ecs
->event_thread
->stop_signal
== TARGET_SIGNAL_STOP
2848 || ecs
->event_thread
->stop_signal
== TARGET_SIGNAL_TRAP
2849 || ecs
->event_thread
->stop_signal
== TARGET_SIGNAL_0
))
2851 stop_stepping (ecs
);
2852 ecs
->event_thread
->stop_signal
= TARGET_SIGNAL_0
;
2856 /* See if there is a breakpoint at the current PC. */
2857 ecs
->event_thread
->stop_bpstat
= bpstat_stop_status (stop_pc
, ecs
->ptid
);
2859 /* Following in case break condition called a
2861 stop_print_frame
= 1;
2863 /* NOTE: cagney/2003-03-29: These two checks for a random signal
2864 at one stage in the past included checks for an inferior
2865 function call's call dummy's return breakpoint. The original
2866 comment, that went with the test, read:
2868 ``End of a stack dummy. Some systems (e.g. Sony news) give
2869 another signal besides SIGTRAP, so check here as well as
2872 If someone ever tries to get call dummys on a
2873 non-executable stack to work (where the target would stop
2874 with something like a SIGSEGV), then those tests might need
2875 to be re-instated. Given, however, that the tests were only
2876 enabled when momentary breakpoints were not being used, I
2877 suspect that it won't be the case.
2879 NOTE: kettenis/2004-02-05: Indeed such checks don't seem to
2880 be necessary for call dummies on a non-executable stack on
2883 if (ecs
->event_thread
->stop_signal
== TARGET_SIGNAL_TRAP
)
2885 = !(bpstat_explains_signal (ecs
->event_thread
->stop_bpstat
)
2886 || ecs
->event_thread
->trap_expected
2887 || (ecs
->event_thread
->step_range_end
2888 && ecs
->event_thread
->step_resume_breakpoint
== NULL
));
2891 ecs
->random_signal
= !bpstat_explains_signal (ecs
->event_thread
->stop_bpstat
);
2892 if (!ecs
->random_signal
)
2893 ecs
->event_thread
->stop_signal
= TARGET_SIGNAL_TRAP
;
2897 /* When we reach this point, we've pretty much decided
2898 that the reason for stopping must've been a random
2899 (unexpected) signal. */
2902 ecs
->random_signal
= 1;
2904 process_event_stop_test
:
2905 /* For the program's own signals, act according to
2906 the signal handling tables. */
2908 if (ecs
->random_signal
)
2910 /* Signal not for debugging purposes. */
2914 fprintf_unfiltered (gdb_stdlog
, "infrun: random signal %d\n",
2915 ecs
->event_thread
->stop_signal
);
2917 stopped_by_random_signal
= 1;
2919 if (signal_print
[ecs
->event_thread
->stop_signal
])
2922 target_terminal_ours_for_output ();
2923 print_stop_reason (SIGNAL_RECEIVED
, ecs
->event_thread
->stop_signal
);
2925 /* Always stop on signals if we're either just gaining control
2926 of the program, or the user explicitly requested this thread
2927 to remain stopped. */
2928 if (stop_soon
!= NO_STOP_QUIETLY
2929 || ecs
->event_thread
->stop_requested
2930 || signal_stop_state (ecs
->event_thread
->stop_signal
))
2932 stop_stepping (ecs
);
2935 /* If not going to stop, give terminal back
2936 if we took it away. */
2938 target_terminal_inferior ();
2940 /* Clear the signal if it should not be passed. */
2941 if (signal_program
[ecs
->event_thread
->stop_signal
] == 0)
2942 ecs
->event_thread
->stop_signal
= TARGET_SIGNAL_0
;
2944 if (ecs
->event_thread
->prev_pc
== read_pc ()
2945 && ecs
->event_thread
->trap_expected
2946 && ecs
->event_thread
->step_resume_breakpoint
== NULL
)
2948 /* We were just starting a new sequence, attempting to
2949 single-step off of a breakpoint and expecting a SIGTRAP.
2950 Instead this signal arrives. This signal will take us out
2951 of the stepping range so GDB needs to remember to, when
2952 the signal handler returns, resume stepping off that
2954 /* To simplify things, "continue" is forced to use the same
2955 code paths as single-step - set a breakpoint at the
2956 signal return address and then, once hit, step off that
2959 fprintf_unfiltered (gdb_stdlog
,
2960 "infrun: signal arrived while stepping over "
2963 insert_step_resume_breakpoint_at_frame (get_current_frame ());
2964 ecs
->event_thread
->step_after_step_resume_breakpoint
= 1;
2969 if (ecs
->event_thread
->step_range_end
!= 0
2970 && ecs
->event_thread
->stop_signal
!= TARGET_SIGNAL_0
2971 && (ecs
->event_thread
->step_range_start
<= stop_pc
2972 && stop_pc
< ecs
->event_thread
->step_range_end
)
2973 && frame_id_eq (get_frame_id (get_current_frame ()),
2974 ecs
->event_thread
->step_frame_id
)
2975 && ecs
->event_thread
->step_resume_breakpoint
== NULL
)
2977 /* The inferior is about to take a signal that will take it
2978 out of the single step range. Set a breakpoint at the
2979 current PC (which is presumably where the signal handler
2980 will eventually return) and then allow the inferior to
2983 Note that this is only needed for a signal delivered
2984 while in the single-step range. Nested signals aren't a
2985 problem as they eventually all return. */
2987 fprintf_unfiltered (gdb_stdlog
,
2988 "infrun: signal may take us out of "
2989 "single-step range\n");
2991 insert_step_resume_breakpoint_at_frame (get_current_frame ());
2996 /* Note: step_resume_breakpoint may be non-NULL. This occures
2997 when either there's a nested signal, or when there's a
2998 pending signal enabled just as the signal handler returns
2999 (leaving the inferior at the step-resume-breakpoint without
3000 actually executing it). Either way continue until the
3001 breakpoint is really hit. */
3006 /* Handle cases caused by hitting a breakpoint. */
3008 CORE_ADDR jmp_buf_pc
;
3009 struct bpstat_what what
;
3011 what
= bpstat_what (ecs
->event_thread
->stop_bpstat
);
3013 if (what
.call_dummy
)
3015 stop_stack_dummy
= 1;
3018 switch (what
.main_action
)
3020 case BPSTAT_WHAT_SET_LONGJMP_RESUME
:
3021 /* If we hit the breakpoint at longjmp while stepping, we
3022 install a momentary breakpoint at the target of the
3026 fprintf_unfiltered (gdb_stdlog
,
3027 "infrun: BPSTAT_WHAT_SET_LONGJMP_RESUME\n");
3029 ecs
->event_thread
->stepping_over_breakpoint
= 1;
3031 if (!gdbarch_get_longjmp_target_p (current_gdbarch
)
3032 || !gdbarch_get_longjmp_target (current_gdbarch
,
3033 get_current_frame (), &jmp_buf_pc
))
3036 fprintf_unfiltered (gdb_stdlog
, "\
3037 infrun: BPSTAT_WHAT_SET_LONGJMP_RESUME (!gdbarch_get_longjmp_target)\n");
3042 /* We're going to replace the current step-resume breakpoint
3043 with a longjmp-resume breakpoint. */
3044 delete_step_resume_breakpoint (ecs
->event_thread
);
3046 /* Insert a breakpoint at resume address. */
3047 insert_longjmp_resume_breakpoint (jmp_buf_pc
);
3052 case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME
:
3054 fprintf_unfiltered (gdb_stdlog
,
3055 "infrun: BPSTAT_WHAT_CLEAR_LONGJMP_RESUME\n");
3057 gdb_assert (ecs
->event_thread
->step_resume_breakpoint
!= NULL
);
3058 delete_step_resume_breakpoint (ecs
->event_thread
);
3060 ecs
->event_thread
->stop_step
= 1;
3061 print_stop_reason (END_STEPPING_RANGE
, 0);
3062 stop_stepping (ecs
);
3065 case BPSTAT_WHAT_SINGLE
:
3067 fprintf_unfiltered (gdb_stdlog
, "infrun: BPSTAT_WHAT_SINGLE\n");
3068 ecs
->event_thread
->stepping_over_breakpoint
= 1;
3069 /* Still need to check other stuff, at least the case
3070 where we are stepping and step out of the right range. */
3073 case BPSTAT_WHAT_STOP_NOISY
:
3075 fprintf_unfiltered (gdb_stdlog
, "infrun: BPSTAT_WHAT_STOP_NOISY\n");
3076 stop_print_frame
= 1;
3078 /* We are about to nuke the step_resume_breakpointt via the
3079 cleanup chain, so no need to worry about it here. */
3081 stop_stepping (ecs
);
3084 case BPSTAT_WHAT_STOP_SILENT
:
3086 fprintf_unfiltered (gdb_stdlog
, "infrun: BPSTAT_WHAT_STOP_SILENT\n");
3087 stop_print_frame
= 0;
3089 /* We are about to nuke the step_resume_breakpoin via the
3090 cleanup chain, so no need to worry about it here. */
3092 stop_stepping (ecs
);
3095 case BPSTAT_WHAT_STEP_RESUME
:
3097 fprintf_unfiltered (gdb_stdlog
, "infrun: BPSTAT_WHAT_STEP_RESUME\n");
3099 delete_step_resume_breakpoint (ecs
->event_thread
);
3100 if (ecs
->event_thread
->step_after_step_resume_breakpoint
)
3102 /* Back when the step-resume breakpoint was inserted, we
3103 were trying to single-step off a breakpoint. Go back
3105 ecs
->event_thread
->step_after_step_resume_breakpoint
= 0;
3106 ecs
->event_thread
->stepping_over_breakpoint
= 1;
3110 if (stop_pc
== ecs
->stop_func_start
3111 && execution_direction
== EXEC_REVERSE
)
3113 /* We are stepping over a function call in reverse, and
3114 just hit the step-resume breakpoint at the start
3115 address of the function. Go back to single-stepping,
3116 which should take us back to the function call. */
3117 ecs
->event_thread
->stepping_over_breakpoint
= 1;
3123 case BPSTAT_WHAT_CHECK_SHLIBS
:
3124 case BPSTAT_WHAT_CHECK_SHLIBS_RESUME_FROM_HOOK
:
3127 fprintf_unfiltered (gdb_stdlog
, "infrun: BPSTAT_WHAT_CHECK_SHLIBS\n");
3129 /* Check for any newly added shared libraries if we're
3130 supposed to be adding them automatically. Switch
3131 terminal for any messages produced by
3132 breakpoint_re_set. */
3133 target_terminal_ours_for_output ();
3134 /* NOTE: cagney/2003-11-25: Make certain that the target
3135 stack's section table is kept up-to-date. Architectures,
3136 (e.g., PPC64), use the section table to perform
3137 operations such as address => section name and hence
3138 require the table to contain all sections (including
3139 those found in shared libraries). */
3140 /* NOTE: cagney/2003-11-25: Pass current_target and not
3141 exec_ops to SOLIB_ADD. This is because current GDB is
3142 only tooled to propagate section_table changes out from
3143 the "current_target" (see target_resize_to_sections), and
3144 not up from the exec stratum. This, of course, isn't
3145 right. "infrun.c" should only interact with the
3146 exec/process stratum, instead relying on the target stack
3147 to propagate relevant changes (stop, section table
3148 changed, ...) up to other layers. */
3150 SOLIB_ADD (NULL
, 0, ¤t_target
, auto_solib_add
);
3152 solib_add (NULL
, 0, ¤t_target
, auto_solib_add
);
3154 target_terminal_inferior ();
3156 /* If requested, stop when the dynamic linker notifies
3157 gdb of events. This allows the user to get control
3158 and place breakpoints in initializer routines for
3159 dynamically loaded objects (among other things). */
3160 if (stop_on_solib_events
|| stop_stack_dummy
)
3162 stop_stepping (ecs
);
3167 /* We want to step over this breakpoint, then keep going. */
3168 ecs
->event_thread
->stepping_over_breakpoint
= 1;
3174 case BPSTAT_WHAT_LAST
:
3175 /* Not a real code, but listed here to shut up gcc -Wall. */
3177 case BPSTAT_WHAT_KEEP_CHECKING
:
3182 /* We come here if we hit a breakpoint but should not
3183 stop for it. Possibly we also were stepping
3184 and should stop for that. So fall through and
3185 test for stepping. But, if not stepping,
3188 /* Are we stepping to get the inferior out of the dynamic linker's
3189 hook (and possibly the dld itself) after catching a shlib
3191 if (ecs
->event_thread
->stepping_through_solib_after_catch
)
3193 #if defined(SOLIB_ADD)
3194 /* Have we reached our destination? If not, keep going. */
3195 if (SOLIB_IN_DYNAMIC_LINKER (PIDGET (ecs
->ptid
), stop_pc
))
3198 fprintf_unfiltered (gdb_stdlog
, "infrun: stepping in dynamic linker\n");
3199 ecs
->event_thread
->stepping_over_breakpoint
= 1;
3205 fprintf_unfiltered (gdb_stdlog
, "infrun: step past dynamic linker\n");
3206 /* Else, stop and report the catchpoint(s) whose triggering
3207 caused us to begin stepping. */
3208 ecs
->event_thread
->stepping_through_solib_after_catch
= 0;
3209 bpstat_clear (&ecs
->event_thread
->stop_bpstat
);
3210 ecs
->event_thread
->stop_bpstat
3211 = bpstat_copy (ecs
->event_thread
->stepping_through_solib_catchpoints
);
3212 bpstat_clear (&ecs
->event_thread
->stepping_through_solib_catchpoints
);
3213 stop_print_frame
= 1;
3214 stop_stepping (ecs
);
3218 if (ecs
->event_thread
->step_resume_breakpoint
)
3221 fprintf_unfiltered (gdb_stdlog
,
3222 "infrun: step-resume breakpoint is inserted\n");
3224 /* Having a step-resume breakpoint overrides anything
3225 else having to do with stepping commands until
3226 that breakpoint is reached. */
3231 if (ecs
->event_thread
->step_range_end
== 0)
3234 fprintf_unfiltered (gdb_stdlog
, "infrun: no stepping, continue\n");
3235 /* Likewise if we aren't even stepping. */
3240 /* If stepping through a line, keep going if still within it.
3242 Note that step_range_end is the address of the first instruction
3243 beyond the step range, and NOT the address of the last instruction
3245 if (stop_pc
>= ecs
->event_thread
->step_range_start
3246 && stop_pc
< ecs
->event_thread
->step_range_end
)
3249 fprintf_unfiltered (gdb_stdlog
, "infrun: stepping inside range [0x%s-0x%s]\n",
3250 paddr_nz (ecs
->event_thread
->step_range_start
),
3251 paddr_nz (ecs
->event_thread
->step_range_end
));
3253 /* When stepping backward, stop at beginning of line range
3254 (unless it's the function entry point, in which case
3255 keep going back to the call point). */
3256 if (stop_pc
== ecs
->event_thread
->step_range_start
3257 && stop_pc
!= ecs
->stop_func_start
3258 && execution_direction
== EXEC_REVERSE
)
3260 ecs
->event_thread
->stop_step
= 1;
3261 print_stop_reason (END_STEPPING_RANGE
, 0);
3262 stop_stepping (ecs
);
3270 /* We stepped out of the stepping range. */
3272 /* If we are stepping at the source level and entered the runtime
3273 loader dynamic symbol resolution code, we keep on single stepping
3274 until we exit the run time loader code and reach the callee's
3276 if (ecs
->event_thread
->step_over_calls
== STEP_OVER_UNDEBUGGABLE
3277 && in_solib_dynsym_resolve_code (stop_pc
))
3279 CORE_ADDR pc_after_resolver
=
3280 gdbarch_skip_solib_resolver (current_gdbarch
, stop_pc
);
3283 fprintf_unfiltered (gdb_stdlog
, "infrun: stepped into dynsym resolve code\n");
3285 if (pc_after_resolver
)
3287 /* Set up a step-resume breakpoint at the address
3288 indicated by SKIP_SOLIB_RESOLVER. */
3289 struct symtab_and_line sr_sal
;
3291 sr_sal
.pc
= pc_after_resolver
;
3293 insert_step_resume_breakpoint_at_sal (sr_sal
, null_frame_id
);
3300 if (ecs
->event_thread
->step_range_end
!= 1
3301 && (ecs
->event_thread
->step_over_calls
== STEP_OVER_UNDEBUGGABLE
3302 || ecs
->event_thread
->step_over_calls
== STEP_OVER_ALL
)
3303 && get_frame_type (get_current_frame ()) == SIGTRAMP_FRAME
)
3306 fprintf_unfiltered (gdb_stdlog
, "infrun: stepped into signal trampoline\n");
3307 /* The inferior, while doing a "step" or "next", has ended up in
3308 a signal trampoline (either by a signal being delivered or by
3309 the signal handler returning). Just single-step until the
3310 inferior leaves the trampoline (either by calling the handler
3316 /* Check for subroutine calls. The check for the current frame
3317 equalling the step ID is not necessary - the check of the
3318 previous frame's ID is sufficient - but it is a common case and
3319 cheaper than checking the previous frame's ID.
3321 NOTE: frame_id_eq will never report two invalid frame IDs as
3322 being equal, so to get into this block, both the current and
3323 previous frame must have valid frame IDs. */
3324 if (!frame_id_eq (get_frame_id (get_current_frame ()),
3325 ecs
->event_thread
->step_frame_id
)
3326 && (frame_id_eq (frame_unwind_id (get_current_frame ()),
3327 ecs
->event_thread
->step_frame_id
)
3328 || execution_direction
== EXEC_REVERSE
))
3330 CORE_ADDR real_stop_pc
;
3333 fprintf_unfiltered (gdb_stdlog
, "infrun: stepped into subroutine\n");
3335 if ((ecs
->event_thread
->step_over_calls
== STEP_OVER_NONE
)
3336 || ((ecs
->event_thread
->step_range_end
== 1)
3337 && in_prologue (ecs
->event_thread
->prev_pc
,
3338 ecs
->stop_func_start
)))
3340 /* I presume that step_over_calls is only 0 when we're
3341 supposed to be stepping at the assembly language level
3342 ("stepi"). Just stop. */
3343 /* Also, maybe we just did a "nexti" inside a prolog, so we
3344 thought it was a subroutine call but it was not. Stop as
3346 ecs
->event_thread
->stop_step
= 1;
3347 print_stop_reason (END_STEPPING_RANGE
, 0);
3348 stop_stepping (ecs
);
3352 if (ecs
->event_thread
->step_over_calls
== STEP_OVER_ALL
)
3354 /* We're doing a "next".
3356 Normal (forward) execution: set a breakpoint at the
3357 callee's return address (the address at which the caller
3360 Reverse (backward) execution. set the step-resume
3361 breakpoint at the start of the function that we just
3362 stepped into (backwards), and continue to there. When we
3363 get there, we'll need to single-step back to the caller. */
3365 if (execution_direction
== EXEC_REVERSE
)
3367 struct symtab_and_line sr_sal
;
3369 if (ecs
->stop_func_start
== 0
3370 && in_solib_dynsym_resolve_code (stop_pc
))
3372 /* Stepped into runtime loader dynamic symbol
3373 resolution code. Since we're in reverse,
3374 we have already backed up through the runtime
3375 loader and the dynamic function. This is just
3376 the trampoline (jump table).
3378 Just keep stepping, we'll soon be home.
3383 /* Normal (staticly linked) function call return. */
3385 sr_sal
.pc
= ecs
->stop_func_start
;
3386 insert_step_resume_breakpoint_at_sal (sr_sal
, null_frame_id
);
3389 insert_step_resume_breakpoint_at_caller (get_current_frame ());
3395 /* If we are in a function call trampoline (a stub between the
3396 calling routine and the real function), locate the real
3397 function. That's what tells us (a) whether we want to step
3398 into it at all, and (b) what prologue we want to run to the
3399 end of, if we do step into it. */
3400 real_stop_pc
= skip_language_trampoline (get_current_frame (), stop_pc
);
3401 if (real_stop_pc
== 0)
3402 real_stop_pc
= gdbarch_skip_trampoline_code
3403 (current_gdbarch
, get_current_frame (), stop_pc
);
3404 if (real_stop_pc
!= 0)
3405 ecs
->stop_func_start
= real_stop_pc
;
3407 if (real_stop_pc
!= 0 && in_solib_dynsym_resolve_code (real_stop_pc
))
3409 struct symtab_and_line sr_sal
;
3411 sr_sal
.pc
= ecs
->stop_func_start
;
3413 insert_step_resume_breakpoint_at_sal (sr_sal
, null_frame_id
);
3418 /* If we have line number information for the function we are
3419 thinking of stepping into, step into it.
3421 If there are several symtabs at that PC (e.g. with include
3422 files), just want to know whether *any* of them have line
3423 numbers. find_pc_line handles this. */
3425 struct symtab_and_line tmp_sal
;
3427 tmp_sal
= find_pc_line (ecs
->stop_func_start
, 0);
3428 if (tmp_sal
.line
!= 0)
3430 if (execution_direction
== EXEC_REVERSE
)
3431 handle_step_into_function_backward (ecs
);
3433 handle_step_into_function (ecs
);
3438 /* If we have no line number and the step-stop-if-no-debug is
3439 set, we stop the step so that the user has a chance to switch
3440 in assembly mode. */
3441 if (ecs
->event_thread
->step_over_calls
== STEP_OVER_UNDEBUGGABLE
3442 && step_stop_if_no_debug
)
3444 ecs
->event_thread
->stop_step
= 1;
3445 print_stop_reason (END_STEPPING_RANGE
, 0);
3446 stop_stepping (ecs
);
3450 if (execution_direction
== EXEC_REVERSE
)
3452 /* Set a breakpoint at callee's start address.
3453 From there we can step once and be back in the caller. */
3454 struct symtab_and_line sr_sal
;
3456 sr_sal
.pc
= ecs
->stop_func_start
;
3457 insert_step_resume_breakpoint_at_sal (sr_sal
, null_frame_id
);
3460 /* Set a breakpoint at callee's return address (the address
3461 at which the caller will resume). */
3462 insert_step_resume_breakpoint_at_caller (get_current_frame ());
3468 /* If we're in the return path from a shared library trampoline,
3469 we want to proceed through the trampoline when stepping. */
3470 if (gdbarch_in_solib_return_trampoline (current_gdbarch
,
3471 stop_pc
, ecs
->stop_func_name
))
3473 /* Determine where this trampoline returns. */
3474 CORE_ADDR real_stop_pc
;
3475 real_stop_pc
= gdbarch_skip_trampoline_code
3476 (current_gdbarch
, get_current_frame (), stop_pc
);
3479 fprintf_unfiltered (gdb_stdlog
, "infrun: stepped into solib return tramp\n");
3481 /* Only proceed through if we know where it's going. */
3484 /* And put the step-breakpoint there and go until there. */
3485 struct symtab_and_line sr_sal
;
3487 init_sal (&sr_sal
); /* initialize to zeroes */
3488 sr_sal
.pc
= real_stop_pc
;
3489 sr_sal
.section
= find_pc_overlay (sr_sal
.pc
);
3491 /* Do not specify what the fp should be when we stop since
3492 on some machines the prologue is where the new fp value
3494 insert_step_resume_breakpoint_at_sal (sr_sal
, null_frame_id
);
3496 /* Restart without fiddling with the step ranges or
3503 stop_pc_sal
= find_pc_line (stop_pc
, 0);
3505 /* NOTE: tausq/2004-05-24: This if block used to be done before all
3506 the trampoline processing logic, however, there are some trampolines
3507 that have no names, so we should do trampoline handling first. */
3508 if (ecs
->event_thread
->step_over_calls
== STEP_OVER_UNDEBUGGABLE
3509 && ecs
->stop_func_name
== NULL
3510 && stop_pc_sal
.line
== 0)
3513 fprintf_unfiltered (gdb_stdlog
, "infrun: stepped into undebuggable function\n");
3515 /* The inferior just stepped into, or returned to, an
3516 undebuggable function (where there is no debugging information
3517 and no line number corresponding to the address where the
3518 inferior stopped). Since we want to skip this kind of code,
3519 we keep going until the inferior returns from this
3520 function - unless the user has asked us not to (via
3521 set step-mode) or we no longer know how to get back
3522 to the call site. */
3523 if (step_stop_if_no_debug
3524 || !frame_id_p (frame_unwind_id (get_current_frame ())))
3526 /* If we have no line number and the step-stop-if-no-debug
3527 is set, we stop the step so that the user has a chance to
3528 switch in assembly mode. */
3529 ecs
->event_thread
->stop_step
= 1;
3530 print_stop_reason (END_STEPPING_RANGE
, 0);
3531 stop_stepping (ecs
);
3536 /* Set a breakpoint at callee's return address (the address
3537 at which the caller will resume). */
3538 insert_step_resume_breakpoint_at_caller (get_current_frame ());
3544 if (ecs
->event_thread
->step_range_end
== 1)
3546 /* It is stepi or nexti. We always want to stop stepping after
3549 fprintf_unfiltered (gdb_stdlog
, "infrun: stepi/nexti\n");
3550 ecs
->event_thread
->stop_step
= 1;
3551 print_stop_reason (END_STEPPING_RANGE
, 0);
3552 stop_stepping (ecs
);
3556 if (stop_pc_sal
.line
== 0)
3558 /* We have no line number information. That means to stop
3559 stepping (does this always happen right after one instruction,
3560 when we do "s" in a function with no line numbers,
3561 or can this happen as a result of a return or longjmp?). */
3563 fprintf_unfiltered (gdb_stdlog
, "infrun: no line number info\n");
3564 ecs
->event_thread
->stop_step
= 1;
3565 print_stop_reason (END_STEPPING_RANGE
, 0);
3566 stop_stepping (ecs
);
3570 if ((stop_pc
== stop_pc_sal
.pc
)
3571 && (ecs
->event_thread
->current_line
!= stop_pc_sal
.line
3572 || ecs
->event_thread
->current_symtab
!= stop_pc_sal
.symtab
))
3574 /* We are at the start of a different line. So stop. Note that
3575 we don't stop if we step into the middle of a different line.
3576 That is said to make things like for (;;) statements work
3579 fprintf_unfiltered (gdb_stdlog
, "infrun: stepped to a different line\n");
3580 ecs
->event_thread
->stop_step
= 1;
3581 print_stop_reason (END_STEPPING_RANGE
, 0);
3582 stop_stepping (ecs
);
3586 /* We aren't done stepping.
3588 Optimize by setting the stepping range to the line.
3589 (We might not be in the original line, but if we entered a
3590 new line in mid-statement, we continue stepping. This makes
3591 things like for(;;) statements work better.) */
3593 ecs
->event_thread
->step_range_start
= stop_pc_sal
.pc
;
3594 ecs
->event_thread
->step_range_end
= stop_pc_sal
.end
;
3595 ecs
->event_thread
->step_frame_id
= get_frame_id (get_current_frame ());
3596 ecs
->event_thread
->current_line
= stop_pc_sal
.line
;
3597 ecs
->event_thread
->current_symtab
= stop_pc_sal
.symtab
;
3600 fprintf_unfiltered (gdb_stdlog
, "infrun: keep going\n");
3604 /* Are we in the middle of stepping? */
3607 currently_stepping (struct thread_info
*tp
)
3609 return (((tp
->step_range_end
&& tp
->step_resume_breakpoint
== NULL
)
3610 || tp
->trap_expected
)
3611 || tp
->stepping_through_solib_after_catch
3612 || bpstat_should_step ());
3615 /* Inferior has stepped into a subroutine call with source code that
3616 we should not step over. Do step to the first line of code in
3620 handle_step_into_function (struct execution_control_state
*ecs
)
3623 struct symtab_and_line stop_func_sal
, sr_sal
;
3625 s
= find_pc_symtab (stop_pc
);
3626 if (s
&& s
->language
!= language_asm
)
3627 ecs
->stop_func_start
= gdbarch_skip_prologue (current_gdbarch
,
3628 ecs
->stop_func_start
);
3630 stop_func_sal
= find_pc_line (ecs
->stop_func_start
, 0);
3631 /* Use the step_resume_break to step until the end of the prologue,
3632 even if that involves jumps (as it seems to on the vax under
3634 /* If the prologue ends in the middle of a source line, continue to
3635 the end of that source line (if it is still within the function).
3636 Otherwise, just go to end of prologue. */
3637 if (stop_func_sal
.end
3638 && stop_func_sal
.pc
!= ecs
->stop_func_start
3639 && stop_func_sal
.end
< ecs
->stop_func_end
)
3640 ecs
->stop_func_start
= stop_func_sal
.end
;
3642 /* Architectures which require breakpoint adjustment might not be able
3643 to place a breakpoint at the computed address. If so, the test
3644 ``ecs->stop_func_start == stop_pc'' will never succeed. Adjust
3645 ecs->stop_func_start to an address at which a breakpoint may be
3646 legitimately placed.
3648 Note: kevinb/2004-01-19: On FR-V, if this adjustment is not
3649 made, GDB will enter an infinite loop when stepping through
3650 optimized code consisting of VLIW instructions which contain
3651 subinstructions corresponding to different source lines. On
3652 FR-V, it's not permitted to place a breakpoint on any but the
3653 first subinstruction of a VLIW instruction. When a breakpoint is
3654 set, GDB will adjust the breakpoint address to the beginning of
3655 the VLIW instruction. Thus, we need to make the corresponding
3656 adjustment here when computing the stop address. */
3658 if (gdbarch_adjust_breakpoint_address_p (current_gdbarch
))
3660 ecs
->stop_func_start
3661 = gdbarch_adjust_breakpoint_address (current_gdbarch
,
3662 ecs
->stop_func_start
);
3665 if (ecs
->stop_func_start
== stop_pc
)
3667 /* We are already there: stop now. */
3668 ecs
->event_thread
->stop_step
= 1;
3669 print_stop_reason (END_STEPPING_RANGE
, 0);
3670 stop_stepping (ecs
);
3675 /* Put the step-breakpoint there and go until there. */
3676 init_sal (&sr_sal
); /* initialize to zeroes */
3677 sr_sal
.pc
= ecs
->stop_func_start
;
3678 sr_sal
.section
= find_pc_overlay (ecs
->stop_func_start
);
3680 /* Do not specify what the fp should be when we stop since on
3681 some machines the prologue is where the new fp value is
3683 insert_step_resume_breakpoint_at_sal (sr_sal
, null_frame_id
);
3685 /* And make sure stepping stops right away then. */
3686 ecs
->event_thread
->step_range_end
= ecs
->event_thread
->step_range_start
;
3691 /* Inferior has stepped backward into a subroutine call with source
3692 code that we should not step over. Do step to the beginning of the
3693 last line of code in it. */
3696 handle_step_into_function_backward (struct execution_control_state
*ecs
)
3699 struct symtab_and_line stop_func_sal
, sr_sal
;
3701 s
= find_pc_symtab (stop_pc
);
3702 if (s
&& s
->language
!= language_asm
)
3703 ecs
->stop_func_start
= gdbarch_skip_prologue (current_gdbarch
,
3704 ecs
->stop_func_start
);
3706 stop_func_sal
= find_pc_line (stop_pc
, 0);
3708 /* OK, we're just going to keep stepping here. */
3709 if (stop_func_sal
.pc
== stop_pc
)
3711 /* We're there already. Just stop stepping now. */
3712 ecs
->event_thread
->stop_step
= 1;
3713 print_stop_reason (END_STEPPING_RANGE
, 0);
3714 stop_stepping (ecs
);
3718 /* Else just reset the step range and keep going.
3719 No step-resume breakpoint, they don't work for
3720 epilogues, which can have multiple entry paths. */
3721 ecs
->event_thread
->step_range_start
= stop_func_sal
.pc
;
3722 ecs
->event_thread
->step_range_end
= stop_func_sal
.end
;
3728 /* Insert a "step-resume breakpoint" at SR_SAL with frame ID SR_ID.
3729 This is used to both functions and to skip over code. */
3732 insert_step_resume_breakpoint_at_sal (struct symtab_and_line sr_sal
,
3733 struct frame_id sr_id
)
3735 /* There should never be more than one step-resume or longjmp-resume
3736 breakpoint per thread, so we should never be setting a new
3737 step_resume_breakpoint when one is already active. */
3738 gdb_assert (inferior_thread ()->step_resume_breakpoint
== NULL
);
3741 fprintf_unfiltered (gdb_stdlog
,
3742 "infrun: inserting step-resume breakpoint at 0x%s\n",
3743 paddr_nz (sr_sal
.pc
));
3745 inferior_thread ()->step_resume_breakpoint
3746 = set_momentary_breakpoint (sr_sal
, sr_id
, bp_step_resume
);
3749 /* Insert a "step-resume breakpoint" at RETURN_FRAME.pc. This is used
3750 to skip a potential signal handler.
3752 This is called with the interrupted function's frame. The signal
3753 handler, when it returns, will resume the interrupted function at
3757 insert_step_resume_breakpoint_at_frame (struct frame_info
*return_frame
)
3759 struct symtab_and_line sr_sal
;
3761 gdb_assert (return_frame
!= NULL
);
3762 init_sal (&sr_sal
); /* initialize to zeros */
3764 sr_sal
.pc
= gdbarch_addr_bits_remove
3765 (current_gdbarch
, get_frame_pc (return_frame
));
3766 sr_sal
.section
= find_pc_overlay (sr_sal
.pc
);
3768 insert_step_resume_breakpoint_at_sal (sr_sal
, get_frame_id (return_frame
));
3771 /* Similar to insert_step_resume_breakpoint_at_frame, except
3772 but a breakpoint at the previous frame's PC. This is used to
3773 skip a function after stepping into it (for "next" or if the called
3774 function has no debugging information).
3776 The current function has almost always been reached by single
3777 stepping a call or return instruction. NEXT_FRAME belongs to the
3778 current function, and the breakpoint will be set at the caller's
3781 This is a separate function rather than reusing
3782 insert_step_resume_breakpoint_at_frame in order to avoid
3783 get_prev_frame, which may stop prematurely (see the implementation
3784 of frame_unwind_id for an example). */
3787 insert_step_resume_breakpoint_at_caller (struct frame_info
*next_frame
)
3789 struct symtab_and_line sr_sal
;
3791 /* We shouldn't have gotten here if we don't know where the call site
3793 gdb_assert (frame_id_p (frame_unwind_id (next_frame
)));
3795 init_sal (&sr_sal
); /* initialize to zeros */
3797 sr_sal
.pc
= gdbarch_addr_bits_remove
3798 (current_gdbarch
, frame_pc_unwind (next_frame
));
3799 sr_sal
.section
= find_pc_overlay (sr_sal
.pc
);
3801 insert_step_resume_breakpoint_at_sal (sr_sal
, frame_unwind_id (next_frame
));
3804 /* Insert a "longjmp-resume" breakpoint at PC. This is used to set a
3805 new breakpoint at the target of a jmp_buf. The handling of
3806 longjmp-resume uses the same mechanisms used for handling
3807 "step-resume" breakpoints. */
3810 insert_longjmp_resume_breakpoint (CORE_ADDR pc
)
3812 /* There should never be more than one step-resume or longjmp-resume
3813 breakpoint per thread, so we should never be setting a new
3814 longjmp_resume_breakpoint when one is already active. */
3815 gdb_assert (inferior_thread ()->step_resume_breakpoint
== NULL
);
3818 fprintf_unfiltered (gdb_stdlog
,
3819 "infrun: inserting longjmp-resume breakpoint at 0x%s\n",
3822 inferior_thread ()->step_resume_breakpoint
=
3823 set_momentary_breakpoint_at_pc (pc
, bp_longjmp_resume
);
3827 stop_stepping (struct execution_control_state
*ecs
)
3830 fprintf_unfiltered (gdb_stdlog
, "infrun: stop_stepping\n");
3832 /* Let callers know we don't want to wait for the inferior anymore. */
3833 ecs
->wait_some_more
= 0;
3836 /* This function handles various cases where we need to continue
3837 waiting for the inferior. */
3838 /* (Used to be the keep_going: label in the old wait_for_inferior) */
3841 keep_going (struct execution_control_state
*ecs
)
3843 /* Save the pc before execution, to compare with pc after stop. */
3844 ecs
->event_thread
->prev_pc
= read_pc (); /* Might have been DECR_AFTER_BREAK */
3846 /* If we did not do break;, it means we should keep running the
3847 inferior and not return to debugger. */
3849 if (ecs
->event_thread
->trap_expected
3850 && ecs
->event_thread
->stop_signal
!= TARGET_SIGNAL_TRAP
)
3852 /* We took a signal (which we are supposed to pass through to
3853 the inferior, else we'd not get here) and we haven't yet
3854 gotten our trap. Simply continue. */
3855 resume (currently_stepping (ecs
->event_thread
),
3856 ecs
->event_thread
->stop_signal
);
3860 /* Either the trap was not expected, but we are continuing
3861 anyway (the user asked that this signal be passed to the
3864 The signal was SIGTRAP, e.g. it was our signal, but we
3865 decided we should resume from it.
3867 We're going to run this baby now!
3869 Note that insert_breakpoints won't try to re-insert
3870 already inserted breakpoints. Therefore, we don't
3871 care if breakpoints were already inserted, or not. */
3873 if (ecs
->event_thread
->stepping_over_breakpoint
)
3875 if (! use_displaced_stepping (current_gdbarch
))
3876 /* Since we can't do a displaced step, we have to remove
3877 the breakpoint while we step it. To keep things
3878 simple, we remove them all. */
3879 remove_breakpoints ();
3883 struct gdb_exception e
;
3884 /* Stop stepping when inserting breakpoints
3886 TRY_CATCH (e
, RETURN_MASK_ERROR
)
3888 insert_breakpoints ();
3892 stop_stepping (ecs
);
3897 ecs
->event_thread
->trap_expected
= ecs
->event_thread
->stepping_over_breakpoint
;
3899 /* Do not deliver SIGNAL_TRAP (except when the user explicitly
3900 specifies that such a signal should be delivered to the
3903 Typically, this would occure when a user is debugging a
3904 target monitor on a simulator: the target monitor sets a
3905 breakpoint; the simulator encounters this break-point and
3906 halts the simulation handing control to GDB; GDB, noteing
3907 that the break-point isn't valid, returns control back to the
3908 simulator; the simulator then delivers the hardware
3909 equivalent of a SIGNAL_TRAP to the program being debugged. */
3911 if (ecs
->event_thread
->stop_signal
== TARGET_SIGNAL_TRAP
3912 && !signal_program
[ecs
->event_thread
->stop_signal
])
3913 ecs
->event_thread
->stop_signal
= TARGET_SIGNAL_0
;
3915 resume (currently_stepping (ecs
->event_thread
),
3916 ecs
->event_thread
->stop_signal
);
3919 prepare_to_wait (ecs
);
3922 /* This function normally comes after a resume, before
3923 handle_inferior_event exits. It takes care of any last bits of
3924 housekeeping, and sets the all-important wait_some_more flag. */
3927 prepare_to_wait (struct execution_control_state
*ecs
)
3930 fprintf_unfiltered (gdb_stdlog
, "infrun: prepare_to_wait\n");
3931 if (infwait_state
== infwait_normal_state
)
3933 overlay_cache_invalid
= 1;
3935 /* We have to invalidate the registers BEFORE calling
3936 target_wait because they can be loaded from the target while
3937 in target_wait. This makes remote debugging a bit more
3938 efficient for those targets that provide critical registers
3939 as part of their normal status mechanism. */
3941 registers_changed ();
3942 waiton_ptid
= pid_to_ptid (-1);
3944 /* This is the old end of the while loop. Let everybody know we
3945 want to wait for the inferior some more and get called again
3947 ecs
->wait_some_more
= 1;
3950 /* Print why the inferior has stopped. We always print something when
3951 the inferior exits, or receives a signal. The rest of the cases are
3952 dealt with later on in normal_stop() and print_it_typical(). Ideally
3953 there should be a call to this function from handle_inferior_event()
3954 each time stop_stepping() is called.*/
3956 print_stop_reason (enum inferior_stop_reason stop_reason
, int stop_info
)
3958 switch (stop_reason
)
3960 case END_STEPPING_RANGE
:
3961 /* We are done with a step/next/si/ni command. */
3962 /* For now print nothing. */
3963 /* Print a message only if not in the middle of doing a "step n"
3964 operation for n > 1 */
3965 if (!inferior_thread ()->step_multi
3966 || !inferior_thread ()->stop_step
)
3967 if (ui_out_is_mi_like_p (uiout
))
3970 async_reason_lookup (EXEC_ASYNC_END_STEPPING_RANGE
));
3973 /* The inferior was terminated by a signal. */
3974 annotate_signalled ();
3975 if (ui_out_is_mi_like_p (uiout
))
3978 async_reason_lookup (EXEC_ASYNC_EXITED_SIGNALLED
));
3979 ui_out_text (uiout
, "\nProgram terminated with signal ");
3980 annotate_signal_name ();
3981 ui_out_field_string (uiout
, "signal-name",
3982 target_signal_to_name (stop_info
));
3983 annotate_signal_name_end ();
3984 ui_out_text (uiout
, ", ");
3985 annotate_signal_string ();
3986 ui_out_field_string (uiout
, "signal-meaning",
3987 target_signal_to_string (stop_info
));
3988 annotate_signal_string_end ();
3989 ui_out_text (uiout
, ".\n");
3990 ui_out_text (uiout
, "The program no longer exists.\n");
3993 /* The inferior program is finished. */
3994 annotate_exited (stop_info
);
3997 if (ui_out_is_mi_like_p (uiout
))
3998 ui_out_field_string (uiout
, "reason",
3999 async_reason_lookup (EXEC_ASYNC_EXITED
));
4000 ui_out_text (uiout
, "\nProgram exited with code ");
4001 ui_out_field_fmt (uiout
, "exit-code", "0%o",
4002 (unsigned int) stop_info
);
4003 ui_out_text (uiout
, ".\n");
4007 if (ui_out_is_mi_like_p (uiout
))
4010 async_reason_lookup (EXEC_ASYNC_EXITED_NORMALLY
));
4011 ui_out_text (uiout
, "\nProgram exited normally.\n");
4013 /* Support the --return-child-result option. */
4014 return_child_result_value
= stop_info
;
4016 case SIGNAL_RECEIVED
:
4017 /* Signal received. The signal table tells us to print about
4021 if (stop_info
== TARGET_SIGNAL_0
&& !ui_out_is_mi_like_p (uiout
))
4023 struct thread_info
*t
= inferior_thread ();
4025 ui_out_text (uiout
, "\n[");
4026 ui_out_field_string (uiout
, "thread-name",
4027 target_pid_to_str (t
->ptid
));
4028 ui_out_field_fmt (uiout
, "thread-id", "] #%d", t
->num
);
4029 ui_out_text (uiout
, " stopped");
4033 ui_out_text (uiout
, "\nProgram received signal ");
4034 annotate_signal_name ();
4035 if (ui_out_is_mi_like_p (uiout
))
4037 (uiout
, "reason", async_reason_lookup (EXEC_ASYNC_SIGNAL_RECEIVED
));
4038 ui_out_field_string (uiout
, "signal-name",
4039 target_signal_to_name (stop_info
));
4040 annotate_signal_name_end ();
4041 ui_out_text (uiout
, ", ");
4042 annotate_signal_string ();
4043 ui_out_field_string (uiout
, "signal-meaning",
4044 target_signal_to_string (stop_info
));
4045 annotate_signal_string_end ();
4047 ui_out_text (uiout
, ".\n");
4050 /* Reverse execution: target ran out of history info. */
4051 ui_out_text (uiout
, "\nNo more reverse-execution history.\n");
4054 internal_error (__FILE__
, __LINE__
,
4055 _("print_stop_reason: unrecognized enum value"));
4061 /* Here to return control to GDB when the inferior stops for real.
4062 Print appropriate messages, remove breakpoints, give terminal our modes.
4064 STOP_PRINT_FRAME nonzero means print the executing frame
4065 (pc, function, args, file, line number and line text).
4066 BREAKPOINTS_FAILED nonzero means stop was due to error
4067 attempting to insert breakpoints. */
4072 struct target_waitstatus last
;
4075 get_last_target_status (&last_ptid
, &last
);
4077 /* In non-stop mode, we don't want GDB to switch threads behind the
4078 user's back, to avoid races where the user is typing a command to
4079 apply to thread x, but GDB switches to thread y before the user
4080 finishes entering the command. */
4082 /* As with the notification of thread events, we want to delay
4083 notifying the user that we've switched thread context until
4084 the inferior actually stops.
4086 There's no point in saying anything if the inferior has exited.
4087 Note that SIGNALLED here means "exited with a signal", not
4088 "received a signal". */
4090 && !ptid_equal (previous_inferior_ptid
, inferior_ptid
)
4091 && target_has_execution
4092 && last
.kind
!= TARGET_WAITKIND_SIGNALLED
4093 && last
.kind
!= TARGET_WAITKIND_EXITED
)
4095 target_terminal_ours_for_output ();
4096 printf_filtered (_("[Switching to %s]\n"),
4097 target_pid_to_str (inferior_ptid
));
4098 annotate_thread_changed ();
4099 previous_inferior_ptid
= inferior_ptid
;
4102 /* NOTE drow/2004-01-17: Is this still necessary? */
4103 /* Make sure that the current_frame's pc is correct. This
4104 is a correction for setting up the frame info before doing
4105 gdbarch_decr_pc_after_break */
4106 if (target_has_execution
)
4107 /* FIXME: cagney/2002-12-06: Has the PC changed? Thanks to
4108 gdbarch_decr_pc_after_break, the program counter can change. Ask the
4109 frame code to check for this and sort out any resultant mess.
4110 gdbarch_decr_pc_after_break needs to just go away. */
4111 deprecated_update_frame_pc_hack (get_current_frame (), read_pc ());
4113 if (!breakpoints_always_inserted_mode () && target_has_execution
)
4115 if (remove_breakpoints ())
4117 target_terminal_ours_for_output ();
4118 printf_filtered (_("\
4119 Cannot remove breakpoints because program is no longer writable.\n\
4120 It might be running in another process.\n\
4121 Further execution is probably impossible.\n"));
4125 /* If an auto-display called a function and that got a signal,
4126 delete that auto-display to avoid an infinite recursion. */
4128 if (stopped_by_random_signal
)
4129 disable_current_display ();
4131 /* Don't print a message if in the middle of doing a "step n"
4132 operation for n > 1 */
4133 if (target_has_execution
4134 && last
.kind
!= TARGET_WAITKIND_SIGNALLED
4135 && last
.kind
!= TARGET_WAITKIND_EXITED
4136 && inferior_thread ()->step_multi
4137 && inferior_thread ()->stop_step
)
4140 target_terminal_ours ();
4142 /* Set the current source location. This will also happen if we
4143 display the frame below, but the current SAL will be incorrect
4144 during a user hook-stop function. */
4145 if (target_has_stack
&& !stop_stack_dummy
)
4146 set_current_sal_from_frame (get_current_frame (), 1);
4148 if (!target_has_stack
)
4151 if (last
.kind
== TARGET_WAITKIND_SIGNALLED
4152 || last
.kind
== TARGET_WAITKIND_EXITED
)
4155 /* Select innermost stack frame - i.e., current frame is frame 0,
4156 and current location is based on that.
4157 Don't do this on return from a stack dummy routine,
4158 or if the program has exited. */
4160 if (!stop_stack_dummy
)
4162 select_frame (get_current_frame ());
4164 /* Print current location without a level number, if
4165 we have changed functions or hit a breakpoint.
4166 Print source line if we have one.
4167 bpstat_print() contains the logic deciding in detail
4168 what to print, based on the event(s) that just occurred. */
4170 /* If --batch-silent is enabled then there's no need to print the current
4171 source location, and to try risks causing an error message about
4172 missing source files. */
4173 if (stop_print_frame
&& !batch_silent
)
4177 int do_frame_printing
= 1;
4178 struct thread_info
*tp
= inferior_thread ();
4180 bpstat_ret
= bpstat_print (tp
->stop_bpstat
);
4184 /* If we had hit a shared library event breakpoint,
4185 bpstat_print would print out this message. If we hit
4186 an OS-level shared library event, do the same
4188 if (last
.kind
== TARGET_WAITKIND_LOADED
)
4190 printf_filtered (_("Stopped due to shared library event\n"));
4191 source_flag
= SRC_LINE
; /* something bogus */
4192 do_frame_printing
= 0;
4196 /* FIXME: cagney/2002-12-01: Given that a frame ID does
4197 (or should) carry around the function and does (or
4198 should) use that when doing a frame comparison. */
4200 && frame_id_eq (tp
->step_frame_id
,
4201 get_frame_id (get_current_frame ()))
4202 && step_start_function
== find_pc_function (stop_pc
))
4203 source_flag
= SRC_LINE
; /* finished step, just print source line */
4205 source_flag
= SRC_AND_LOC
; /* print location and source line */
4207 case PRINT_SRC_AND_LOC
:
4208 source_flag
= SRC_AND_LOC
; /* print location and source line */
4210 case PRINT_SRC_ONLY
:
4211 source_flag
= SRC_LINE
;
4214 source_flag
= SRC_LINE
; /* something bogus */
4215 do_frame_printing
= 0;
4218 internal_error (__FILE__
, __LINE__
, _("Unknown value."));
4221 if (ui_out_is_mi_like_p (uiout
))
4224 ui_out_field_int (uiout
, "thread-id",
4225 pid_to_thread_id (inferior_ptid
));
4228 struct cleanup
*back_to
= make_cleanup_ui_out_list_begin_end
4229 (uiout
, "stopped-threads");
4230 ui_out_field_int (uiout
, NULL
,
4231 pid_to_thread_id (inferior_ptid
));
4232 do_cleanups (back_to
);
4235 ui_out_field_string (uiout
, "stopped-threads", "all");
4237 /* The behavior of this routine with respect to the source
4239 SRC_LINE: Print only source line
4240 LOCATION: Print only location
4241 SRC_AND_LOC: Print location and source line */
4242 if (do_frame_printing
)
4243 print_stack_frame (get_selected_frame (NULL
), 0, source_flag
);
4245 /* Display the auto-display expressions. */
4250 /* Save the function value return registers, if we care.
4251 We might be about to restore their previous contents. */
4252 if (inferior_thread ()->proceed_to_finish
)
4254 /* This should not be necessary. */
4256 regcache_xfree (stop_registers
);
4258 /* NB: The copy goes through to the target picking up the value of
4259 all the registers. */
4260 stop_registers
= regcache_dup (get_current_regcache ());
4263 if (stop_stack_dummy
)
4265 /* Pop the empty frame that contains the stack dummy. POP_FRAME
4266 ends with a setting of the current frame, so we can use that
4268 frame_pop (get_current_frame ());
4269 /* Set stop_pc to what it was before we called the function.
4270 Can't rely on restore_inferior_status because that only gets
4271 called if we don't stop in the called function. */
4272 stop_pc
= read_pc ();
4273 select_frame (get_current_frame ());
4277 annotate_stopped ();
4278 if (!suppress_stop_observer
4279 && !(target_has_execution
4280 && last
.kind
!= TARGET_WAITKIND_SIGNALLED
4281 && last
.kind
!= TARGET_WAITKIND_EXITED
4282 && inferior_thread ()->step_multi
))
4284 if (!ptid_equal (inferior_ptid
, null_ptid
))
4285 observer_notify_normal_stop (inferior_thread ()->stop_bpstat
);
4287 observer_notify_normal_stop (NULL
);
4289 if (target_has_execution
4290 && last
.kind
!= TARGET_WAITKIND_SIGNALLED
4291 && last
.kind
!= TARGET_WAITKIND_EXITED
)
4293 /* Delete the breakpoint we stopped at, if it wants to be deleted.
4294 Delete any breakpoint that is to be deleted at the next stop. */
4295 breakpoint_auto_delete (inferior_thread ()->stop_bpstat
);
4298 set_running (pid_to_ptid (-1), 0);
4300 set_running (inferior_ptid
, 0);
4303 /* Look up the hook_stop and run it (CLI internally handles problem
4304 of stop_command's pre-hook not existing). */
4306 catch_errors (hook_stop_stub
, stop_command
,
4307 "Error while running hook_stop:\n", RETURN_MASK_ALL
);
4312 hook_stop_stub (void *cmd
)
4314 execute_cmd_pre_hook ((struct cmd_list_element
*) cmd
);
4319 signal_stop_state (int signo
)
4321 return signal_stop
[signo
];
4325 signal_print_state (int signo
)
4327 return signal_print
[signo
];
4331 signal_pass_state (int signo
)
4333 return signal_program
[signo
];
4337 signal_stop_update (int signo
, int state
)
4339 int ret
= signal_stop
[signo
];
4340 signal_stop
[signo
] = state
;
4345 signal_print_update (int signo
, int state
)
4347 int ret
= signal_print
[signo
];
4348 signal_print
[signo
] = state
;
4353 signal_pass_update (int signo
, int state
)
4355 int ret
= signal_program
[signo
];
4356 signal_program
[signo
] = state
;
4361 sig_print_header (void)
4363 printf_filtered (_("\
4364 Signal Stop\tPrint\tPass to program\tDescription\n"));
4368 sig_print_info (enum target_signal oursig
)
4370 char *name
= target_signal_to_name (oursig
);
4371 int name_padding
= 13 - strlen (name
);
4373 if (name_padding
<= 0)
4376 printf_filtered ("%s", name
);
4377 printf_filtered ("%*.*s ", name_padding
, name_padding
, " ");
4378 printf_filtered ("%s\t", signal_stop
[oursig
] ? "Yes" : "No");
4379 printf_filtered ("%s\t", signal_print
[oursig
] ? "Yes" : "No");
4380 printf_filtered ("%s\t\t", signal_program
[oursig
] ? "Yes" : "No");
4381 printf_filtered ("%s\n", target_signal_to_string (oursig
));
4384 /* Specify how various signals in the inferior should be handled. */
4387 handle_command (char *args
, int from_tty
)
4390 int digits
, wordlen
;
4391 int sigfirst
, signum
, siglast
;
4392 enum target_signal oursig
;
4395 unsigned char *sigs
;
4396 struct cleanup
*old_chain
;
4400 error_no_arg (_("signal to handle"));
4403 /* Allocate and zero an array of flags for which signals to handle. */
4405 nsigs
= (int) TARGET_SIGNAL_LAST
;
4406 sigs
= (unsigned char *) alloca (nsigs
);
4407 memset (sigs
, 0, nsigs
);
4409 /* Break the command line up into args. */
4411 argv
= gdb_buildargv (args
);
4412 old_chain
= make_cleanup_freeargv (argv
);
4414 /* Walk through the args, looking for signal oursigs, signal names, and
4415 actions. Signal numbers and signal names may be interspersed with
4416 actions, with the actions being performed for all signals cumulatively
4417 specified. Signal ranges can be specified as <LOW>-<HIGH>. */
4419 while (*argv
!= NULL
)
4421 wordlen
= strlen (*argv
);
4422 for (digits
= 0; isdigit ((*argv
)[digits
]); digits
++)
4426 sigfirst
= siglast
= -1;
4428 if (wordlen
>= 1 && !strncmp (*argv
, "all", wordlen
))
4430 /* Apply action to all signals except those used by the
4431 debugger. Silently skip those. */
4434 siglast
= nsigs
- 1;
4436 else if (wordlen
>= 1 && !strncmp (*argv
, "stop", wordlen
))
4438 SET_SIGS (nsigs
, sigs
, signal_stop
);
4439 SET_SIGS (nsigs
, sigs
, signal_print
);
4441 else if (wordlen
>= 1 && !strncmp (*argv
, "ignore", wordlen
))
4443 UNSET_SIGS (nsigs
, sigs
, signal_program
);
4445 else if (wordlen
>= 2 && !strncmp (*argv
, "print", wordlen
))
4447 SET_SIGS (nsigs
, sigs
, signal_print
);
4449 else if (wordlen
>= 2 && !strncmp (*argv
, "pass", wordlen
))
4451 SET_SIGS (nsigs
, sigs
, signal_program
);
4453 else if (wordlen
>= 3 && !strncmp (*argv
, "nostop", wordlen
))
4455 UNSET_SIGS (nsigs
, sigs
, signal_stop
);
4457 else if (wordlen
>= 3 && !strncmp (*argv
, "noignore", wordlen
))
4459 SET_SIGS (nsigs
, sigs
, signal_program
);
4461 else if (wordlen
>= 4 && !strncmp (*argv
, "noprint", wordlen
))
4463 UNSET_SIGS (nsigs
, sigs
, signal_print
);
4464 UNSET_SIGS (nsigs
, sigs
, signal_stop
);
4466 else if (wordlen
>= 4 && !strncmp (*argv
, "nopass", wordlen
))
4468 UNSET_SIGS (nsigs
, sigs
, signal_program
);
4470 else if (digits
> 0)
4472 /* It is numeric. The numeric signal refers to our own
4473 internal signal numbering from target.h, not to host/target
4474 signal number. This is a feature; users really should be
4475 using symbolic names anyway, and the common ones like
4476 SIGHUP, SIGINT, SIGALRM, etc. will work right anyway. */
4478 sigfirst
= siglast
= (int)
4479 target_signal_from_command (atoi (*argv
));
4480 if ((*argv
)[digits
] == '-')
4483 target_signal_from_command (atoi ((*argv
) + digits
+ 1));
4485 if (sigfirst
> siglast
)
4487 /* Bet he didn't figure we'd think of this case... */
4495 oursig
= target_signal_from_name (*argv
);
4496 if (oursig
!= TARGET_SIGNAL_UNKNOWN
)
4498 sigfirst
= siglast
= (int) oursig
;
4502 /* Not a number and not a recognized flag word => complain. */
4503 error (_("Unrecognized or ambiguous flag word: \"%s\"."), *argv
);
4507 /* If any signal numbers or symbol names were found, set flags for
4508 which signals to apply actions to. */
4510 for (signum
= sigfirst
; signum
>= 0 && signum
<= siglast
; signum
++)
4512 switch ((enum target_signal
) signum
)
4514 case TARGET_SIGNAL_TRAP
:
4515 case TARGET_SIGNAL_INT
:
4516 if (!allsigs
&& !sigs
[signum
])
4518 if (query ("%s is used by the debugger.\n\
4519 Are you sure you want to change it? ", target_signal_to_name ((enum target_signal
) signum
)))
4525 printf_unfiltered (_("Not confirmed, unchanged.\n"));
4526 gdb_flush (gdb_stdout
);
4530 case TARGET_SIGNAL_0
:
4531 case TARGET_SIGNAL_DEFAULT
:
4532 case TARGET_SIGNAL_UNKNOWN
:
4533 /* Make sure that "all" doesn't print these. */
4544 target_notice_signals (inferior_ptid
);
4548 /* Show the results. */
4549 sig_print_header ();
4550 for (signum
= 0; signum
< nsigs
; signum
++)
4554 sig_print_info (signum
);
4559 do_cleanups (old_chain
);
4563 xdb_handle_command (char *args
, int from_tty
)
4566 struct cleanup
*old_chain
;
4569 error_no_arg (_("xdb command"));
4571 /* Break the command line up into args. */
4573 argv
= gdb_buildargv (args
);
4574 old_chain
= make_cleanup_freeargv (argv
);
4575 if (argv
[1] != (char *) NULL
)
4580 bufLen
= strlen (argv
[0]) + 20;
4581 argBuf
= (char *) xmalloc (bufLen
);
4585 enum target_signal oursig
;
4587 oursig
= target_signal_from_name (argv
[0]);
4588 memset (argBuf
, 0, bufLen
);
4589 if (strcmp (argv
[1], "Q") == 0)
4590 sprintf (argBuf
, "%s %s", argv
[0], "noprint");
4593 if (strcmp (argv
[1], "s") == 0)
4595 if (!signal_stop
[oursig
])
4596 sprintf (argBuf
, "%s %s", argv
[0], "stop");
4598 sprintf (argBuf
, "%s %s", argv
[0], "nostop");
4600 else if (strcmp (argv
[1], "i") == 0)
4602 if (!signal_program
[oursig
])
4603 sprintf (argBuf
, "%s %s", argv
[0], "pass");
4605 sprintf (argBuf
, "%s %s", argv
[0], "nopass");
4607 else if (strcmp (argv
[1], "r") == 0)
4609 if (!signal_print
[oursig
])
4610 sprintf (argBuf
, "%s %s", argv
[0], "print");
4612 sprintf (argBuf
, "%s %s", argv
[0], "noprint");
4618 handle_command (argBuf
, from_tty
);
4620 printf_filtered (_("Invalid signal handling flag.\n"));
4625 do_cleanups (old_chain
);
4628 /* Print current contents of the tables set by the handle command.
4629 It is possible we should just be printing signals actually used
4630 by the current target (but for things to work right when switching
4631 targets, all signals should be in the signal tables). */
4634 signals_info (char *signum_exp
, int from_tty
)
4636 enum target_signal oursig
;
4637 sig_print_header ();
4641 /* First see if this is a symbol name. */
4642 oursig
= target_signal_from_name (signum_exp
);
4643 if (oursig
== TARGET_SIGNAL_UNKNOWN
)
4645 /* No, try numeric. */
4647 target_signal_from_command (parse_and_eval_long (signum_exp
));
4649 sig_print_info (oursig
);
4653 printf_filtered ("\n");
4654 /* These ugly casts brought to you by the native VAX compiler. */
4655 for (oursig
= TARGET_SIGNAL_FIRST
;
4656 (int) oursig
< (int) TARGET_SIGNAL_LAST
;
4657 oursig
= (enum target_signal
) ((int) oursig
+ 1))
4661 if (oursig
!= TARGET_SIGNAL_UNKNOWN
4662 && oursig
!= TARGET_SIGNAL_DEFAULT
&& oursig
!= TARGET_SIGNAL_0
)
4663 sig_print_info (oursig
);
4666 printf_filtered (_("\nUse the \"handle\" command to change these tables.\n"));
4669 struct inferior_status
4671 enum target_signal stop_signal
;
4675 int stop_stack_dummy
;
4676 int stopped_by_random_signal
;
4677 int stepping_over_breakpoint
;
4678 CORE_ADDR step_range_start
;
4679 CORE_ADDR step_range_end
;
4680 struct frame_id step_frame_id
;
4681 enum step_over_calls_kind step_over_calls
;
4682 CORE_ADDR step_resume_break_address
;
4683 int stop_after_trap
;
4686 /* These are here because if call_function_by_hand has written some
4687 registers and then decides to call error(), we better not have changed
4689 struct regcache
*registers
;
4691 /* A frame unique identifier. */
4692 struct frame_id selected_frame_id
;
4694 int breakpoint_proceeded
;
4695 int restore_stack_info
;
4696 int proceed_to_finish
;
4699 /* Save all of the information associated with the inferior<==>gdb
4700 connection. INF_STATUS is a pointer to a "struct inferior_status"
4701 (defined in inferior.h). */
4703 struct inferior_status
*
4704 save_inferior_status (int restore_stack_info
)
4706 struct inferior_status
*inf_status
= XMALLOC (struct inferior_status
);
4707 struct thread_info
*tp
= inferior_thread ();
4708 struct inferior
*inf
= current_inferior ();
4710 inf_status
->stop_signal
= tp
->stop_signal
;
4711 inf_status
->stop_pc
= stop_pc
;
4712 inf_status
->stop_step
= tp
->stop_step
;
4713 inf_status
->stop_stack_dummy
= stop_stack_dummy
;
4714 inf_status
->stopped_by_random_signal
= stopped_by_random_signal
;
4715 inf_status
->stepping_over_breakpoint
= tp
->trap_expected
;
4716 inf_status
->step_range_start
= tp
->step_range_start
;
4717 inf_status
->step_range_end
= tp
->step_range_end
;
4718 inf_status
->step_frame_id
= tp
->step_frame_id
;
4719 inf_status
->step_over_calls
= tp
->step_over_calls
;
4720 inf_status
->stop_after_trap
= stop_after_trap
;
4721 inf_status
->stop_soon
= inf
->stop_soon
;
4722 /* Save original bpstat chain here; replace it with copy of chain.
4723 If caller's caller is walking the chain, they'll be happier if we
4724 hand them back the original chain when restore_inferior_status is
4726 inf_status
->stop_bpstat
= tp
->stop_bpstat
;
4727 tp
->stop_bpstat
= bpstat_copy (tp
->stop_bpstat
);
4728 inf_status
->breakpoint_proceeded
= breakpoint_proceeded
;
4729 inf_status
->restore_stack_info
= restore_stack_info
;
4730 inf_status
->proceed_to_finish
= tp
->proceed_to_finish
;
4732 inf_status
->registers
= regcache_dup (get_current_regcache ());
4734 inf_status
->selected_frame_id
= get_frame_id (get_selected_frame (NULL
));
4739 restore_selected_frame (void *args
)
4741 struct frame_id
*fid
= (struct frame_id
*) args
;
4742 struct frame_info
*frame
;
4744 frame
= frame_find_by_id (*fid
);
4746 /* If inf_status->selected_frame_id is NULL, there was no previously
4750 warning (_("Unable to restore previously selected frame."));
4754 select_frame (frame
);
4760 restore_inferior_status (struct inferior_status
*inf_status
)
4762 struct thread_info
*tp
= inferior_thread ();
4763 struct inferior
*inf
= current_inferior ();
4765 tp
->stop_signal
= inf_status
->stop_signal
;
4766 stop_pc
= inf_status
->stop_pc
;
4767 tp
->stop_step
= inf_status
->stop_step
;
4768 stop_stack_dummy
= inf_status
->stop_stack_dummy
;
4769 stopped_by_random_signal
= inf_status
->stopped_by_random_signal
;
4770 tp
->trap_expected
= inf_status
->stepping_over_breakpoint
;
4771 tp
->step_range_start
= inf_status
->step_range_start
;
4772 tp
->step_range_end
= inf_status
->step_range_end
;
4773 tp
->step_frame_id
= inf_status
->step_frame_id
;
4774 tp
->step_over_calls
= inf_status
->step_over_calls
;
4775 stop_after_trap
= inf_status
->stop_after_trap
;
4776 inf
->stop_soon
= inf_status
->stop_soon
;
4777 bpstat_clear (&tp
->stop_bpstat
);
4778 tp
->stop_bpstat
= inf_status
->stop_bpstat
;
4779 breakpoint_proceeded
= inf_status
->breakpoint_proceeded
;
4780 tp
->proceed_to_finish
= inf_status
->proceed_to_finish
;
4782 /* The inferior can be gone if the user types "print exit(0)"
4783 (and perhaps other times). */
4784 if (target_has_execution
)
4785 /* NB: The register write goes through to the target. */
4786 regcache_cpy (get_current_regcache (), inf_status
->registers
);
4787 regcache_xfree (inf_status
->registers
);
4789 /* FIXME: If we are being called after stopping in a function which
4790 is called from gdb, we should not be trying to restore the
4791 selected frame; it just prints a spurious error message (The
4792 message is useful, however, in detecting bugs in gdb (like if gdb
4793 clobbers the stack)). In fact, should we be restoring the
4794 inferior status at all in that case? . */
4796 if (target_has_stack
&& inf_status
->restore_stack_info
)
4798 /* The point of catch_errors is that if the stack is clobbered,
4799 walking the stack might encounter a garbage pointer and
4800 error() trying to dereference it. */
4802 (restore_selected_frame
, &inf_status
->selected_frame_id
,
4803 "Unable to restore previously selected frame:\n",
4804 RETURN_MASK_ERROR
) == 0)
4805 /* Error in restoring the selected frame. Select the innermost
4807 select_frame (get_current_frame ());
4815 do_restore_inferior_status_cleanup (void *sts
)
4817 restore_inferior_status (sts
);
4821 make_cleanup_restore_inferior_status (struct inferior_status
*inf_status
)
4823 return make_cleanup (do_restore_inferior_status_cleanup
, inf_status
);
4827 discard_inferior_status (struct inferior_status
*inf_status
)
4829 /* See save_inferior_status for info on stop_bpstat. */
4830 bpstat_clear (&inf_status
->stop_bpstat
);
4831 regcache_xfree (inf_status
->registers
);
4836 inferior_has_forked (ptid_t pid
, ptid_t
*child_pid
)
4838 struct target_waitstatus last
;
4841 get_last_target_status (&last_ptid
, &last
);
4843 if (last
.kind
!= TARGET_WAITKIND_FORKED
)
4846 if (!ptid_equal (last_ptid
, pid
))
4849 *child_pid
= last
.value
.related_pid
;
4854 inferior_has_vforked (ptid_t pid
, ptid_t
*child_pid
)
4856 struct target_waitstatus last
;
4859 get_last_target_status (&last_ptid
, &last
);
4861 if (last
.kind
!= TARGET_WAITKIND_VFORKED
)
4864 if (!ptid_equal (last_ptid
, pid
))
4867 *child_pid
= last
.value
.related_pid
;
4872 inferior_has_execd (ptid_t pid
, char **execd_pathname
)
4874 struct target_waitstatus last
;
4877 get_last_target_status (&last_ptid
, &last
);
4879 if (last
.kind
!= TARGET_WAITKIND_EXECD
)
4882 if (!ptid_equal (last_ptid
, pid
))
4885 *execd_pathname
= xstrdup (last
.value
.execd_pathname
);
4889 /* Oft used ptids */
4891 ptid_t minus_one_ptid
;
4893 /* Create a ptid given the necessary PID, LWP, and TID components. */
4896 ptid_build (int pid
, long lwp
, long tid
)
4906 /* Create a ptid from just a pid. */
4909 pid_to_ptid (int pid
)
4911 return ptid_build (pid
, 0, 0);
4914 /* Fetch the pid (process id) component from a ptid. */
4917 ptid_get_pid (ptid_t ptid
)
4922 /* Fetch the lwp (lightweight process) component from a ptid. */
4925 ptid_get_lwp (ptid_t ptid
)
4930 /* Fetch the tid (thread id) component from a ptid. */
4933 ptid_get_tid (ptid_t ptid
)
4938 /* ptid_equal() is used to test equality of two ptids. */
4941 ptid_equal (ptid_t ptid1
, ptid_t ptid2
)
4943 return (ptid1
.pid
== ptid2
.pid
&& ptid1
.lwp
== ptid2
.lwp
4944 && ptid1
.tid
== ptid2
.tid
);
4947 /* Returns true if PTID represents a process. */
4950 ptid_is_pid (ptid_t ptid
)
4952 if (ptid_equal (minus_one_ptid
, ptid
))
4954 if (ptid_equal (null_ptid
, ptid
))
4957 return (ptid_get_lwp (ptid
) == 0 && ptid_get_tid (ptid
) == 0);
4960 /* restore_inferior_ptid() will be used by the cleanup machinery
4961 to restore the inferior_ptid value saved in a call to
4962 save_inferior_ptid(). */
4965 restore_inferior_ptid (void *arg
)
4967 ptid_t
*saved_ptid_ptr
= arg
;
4968 inferior_ptid
= *saved_ptid_ptr
;
4972 /* Save the value of inferior_ptid so that it may be restored by a
4973 later call to do_cleanups(). Returns the struct cleanup pointer
4974 needed for later doing the cleanup. */
4977 save_inferior_ptid (void)
4979 ptid_t
*saved_ptid_ptr
;
4981 saved_ptid_ptr
= xmalloc (sizeof (ptid_t
));
4982 *saved_ptid_ptr
= inferior_ptid
;
4983 return make_cleanup (restore_inferior_ptid
, saved_ptid_ptr
);
4987 /* User interface for reverse debugging:
4988 Set exec-direction / show exec-direction commands
4989 (returns error unless target implements to_set_exec_direction method). */
4991 enum exec_direction_kind execution_direction
= EXEC_FORWARD
;
4992 static const char exec_forward
[] = "forward";
4993 static const char exec_reverse
[] = "reverse";
4994 static const char *exec_direction
= exec_forward
;
4995 static const char *exec_direction_names
[] = {
5002 set_exec_direction_func (char *args
, int from_tty
,
5003 struct cmd_list_element
*cmd
)
5005 if (target_can_execute_reverse
)
5007 if (!strcmp (exec_direction
, exec_forward
))
5008 execution_direction
= EXEC_FORWARD
;
5009 else if (!strcmp (exec_direction
, exec_reverse
))
5010 execution_direction
= EXEC_REVERSE
;
5015 show_exec_direction_func (struct ui_file
*out
, int from_tty
,
5016 struct cmd_list_element
*cmd
, const char *value
)
5018 switch (execution_direction
) {
5020 fprintf_filtered (out
, _("Forward.\n"));
5023 fprintf_filtered (out
, _("Reverse.\n"));
5027 fprintf_filtered (out
,
5028 _("Forward (target `%s' does not support exec-direction).\n"),
5034 /* User interface for non-stop mode. */
5037 static int non_stop_1
= 0;
5040 set_non_stop (char *args
, int from_tty
,
5041 struct cmd_list_element
*c
)
5043 if (target_has_execution
)
5045 non_stop_1
= non_stop
;
5046 error (_("Cannot change this setting while the inferior is running."));
5049 non_stop
= non_stop_1
;
5053 show_non_stop (struct ui_file
*file
, int from_tty
,
5054 struct cmd_list_element
*c
, const char *value
)
5056 fprintf_filtered (file
,
5057 _("Controlling the inferior in non-stop mode is %s.\n"),
5063 _initialize_infrun (void)
5067 struct cmd_list_element
*c
;
5069 add_info ("signals", signals_info
, _("\
5070 What debugger does when program gets various signals.\n\
5071 Specify a signal as argument to print info on that signal only."));
5072 add_info_alias ("handle", "signals", 0);
5074 add_com ("handle", class_run
, handle_command
, _("\
5075 Specify how to handle a signal.\n\
5076 Args are signals and actions to apply to those signals.\n\
5077 Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\
5078 from 1-15 are allowed for compatibility with old versions of GDB.\n\
5079 Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\
5080 The special arg \"all\" is recognized to mean all signals except those\n\
5081 used by the debugger, typically SIGTRAP and SIGINT.\n\
5082 Recognized actions include \"stop\", \"nostop\", \"print\", \"noprint\",\n\
5083 \"pass\", \"nopass\", \"ignore\", or \"noignore\".\n\
5084 Stop means reenter debugger if this signal happens (implies print).\n\
5085 Print means print a message if this signal happens.\n\
5086 Pass means let program see this signal; otherwise program doesn't know.\n\
5087 Ignore is a synonym for nopass and noignore is a synonym for pass.\n\
5088 Pass and Stop may be combined."));
5091 add_com ("lz", class_info
, signals_info
, _("\
5092 What debugger does when program gets various signals.\n\
5093 Specify a signal as argument to print info on that signal only."));
5094 add_com ("z", class_run
, xdb_handle_command
, _("\
5095 Specify how to handle a signal.\n\
5096 Args are signals and actions to apply to those signals.\n\
5097 Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\
5098 from 1-15 are allowed for compatibility with old versions of GDB.\n\
5099 Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\
5100 The special arg \"all\" is recognized to mean all signals except those\n\
5101 used by the debugger, typically SIGTRAP and SIGINT.\n\
5102 Recognized actions include \"s\" (toggles between stop and nostop), \n\
5103 \"r\" (toggles between print and noprint), \"i\" (toggles between pass and \
5104 nopass), \"Q\" (noprint)\n\
5105 Stop means reenter debugger if this signal happens (implies print).\n\
5106 Print means print a message if this signal happens.\n\
5107 Pass means let program see this signal; otherwise program doesn't know.\n\
5108 Ignore is a synonym for nopass and noignore is a synonym for pass.\n\
5109 Pass and Stop may be combined."));
5113 stop_command
= add_cmd ("stop", class_obscure
,
5114 not_just_help_class_command
, _("\
5115 There is no `stop' command, but you can set a hook on `stop'.\n\
5116 This allows you to set a list of commands to be run each time execution\n\
5117 of the program stops."), &cmdlist
);
5119 add_setshow_zinteger_cmd ("infrun", class_maintenance
, &debug_infrun
, _("\
5120 Set inferior debugging."), _("\
5121 Show inferior debugging."), _("\
5122 When non-zero, inferior specific debugging is enabled."),
5125 &setdebuglist
, &showdebuglist
);
5127 add_setshow_boolean_cmd ("displaced", class_maintenance
, &debug_displaced
, _("\
5128 Set displaced stepping debugging."), _("\
5129 Show displaced stepping debugging."), _("\
5130 When non-zero, displaced stepping specific debugging is enabled."),
5132 show_debug_displaced
,
5133 &setdebuglist
, &showdebuglist
);
5135 add_setshow_boolean_cmd ("non-stop", no_class
,
5137 Set whether gdb controls the inferior in non-stop mode."), _("\
5138 Show whether gdb controls the inferior in non-stop mode."), _("\
5139 When debugging a multi-threaded program and this setting is\n\
5140 off (the default, also called all-stop mode), when one thread stops\n\
5141 (for a breakpoint, watchpoint, exception, or similar events), GDB stops\n\
5142 all other threads in the program while you interact with the thread of\n\
5143 interest. When you continue or step a thread, you can allow the other\n\
5144 threads to run, or have them remain stopped, but while you inspect any\n\
5145 thread's state, all threads stop.\n\
5147 In non-stop mode, when one thread stops, other threads can continue\n\
5148 to run freely. You'll be able to step each thread independently,\n\
5149 leave it stopped or free to run as needed."),
5155 numsigs
= (int) TARGET_SIGNAL_LAST
;
5156 signal_stop
= (unsigned char *) xmalloc (sizeof (signal_stop
[0]) * numsigs
);
5157 signal_print
= (unsigned char *)
5158 xmalloc (sizeof (signal_print
[0]) * numsigs
);
5159 signal_program
= (unsigned char *)
5160 xmalloc (sizeof (signal_program
[0]) * numsigs
);
5161 for (i
= 0; i
< numsigs
; i
++)
5164 signal_print
[i
] = 1;
5165 signal_program
[i
] = 1;
5168 /* Signals caused by debugger's own actions
5169 should not be given to the program afterwards. */
5170 signal_program
[TARGET_SIGNAL_TRAP
] = 0;
5171 signal_program
[TARGET_SIGNAL_INT
] = 0;
5173 /* Signals that are not errors should not normally enter the debugger. */
5174 signal_stop
[TARGET_SIGNAL_ALRM
] = 0;
5175 signal_print
[TARGET_SIGNAL_ALRM
] = 0;
5176 signal_stop
[TARGET_SIGNAL_VTALRM
] = 0;
5177 signal_print
[TARGET_SIGNAL_VTALRM
] = 0;
5178 signal_stop
[TARGET_SIGNAL_PROF
] = 0;
5179 signal_print
[TARGET_SIGNAL_PROF
] = 0;
5180 signal_stop
[TARGET_SIGNAL_CHLD
] = 0;
5181 signal_print
[TARGET_SIGNAL_CHLD
] = 0;
5182 signal_stop
[TARGET_SIGNAL_IO
] = 0;
5183 signal_print
[TARGET_SIGNAL_IO
] = 0;
5184 signal_stop
[TARGET_SIGNAL_POLL
] = 0;
5185 signal_print
[TARGET_SIGNAL_POLL
] = 0;
5186 signal_stop
[TARGET_SIGNAL_URG
] = 0;
5187 signal_print
[TARGET_SIGNAL_URG
] = 0;
5188 signal_stop
[TARGET_SIGNAL_WINCH
] = 0;
5189 signal_print
[TARGET_SIGNAL_WINCH
] = 0;
5191 /* These signals are used internally by user-level thread
5192 implementations. (See signal(5) on Solaris.) Like the above
5193 signals, a healthy program receives and handles them as part of
5194 its normal operation. */
5195 signal_stop
[TARGET_SIGNAL_LWP
] = 0;
5196 signal_print
[TARGET_SIGNAL_LWP
] = 0;
5197 signal_stop
[TARGET_SIGNAL_WAITING
] = 0;
5198 signal_print
[TARGET_SIGNAL_WAITING
] = 0;
5199 signal_stop
[TARGET_SIGNAL_CANCEL
] = 0;
5200 signal_print
[TARGET_SIGNAL_CANCEL
] = 0;
5202 add_setshow_zinteger_cmd ("stop-on-solib-events", class_support
,
5203 &stop_on_solib_events
, _("\
5204 Set stopping for shared library events."), _("\
5205 Show stopping for shared library events."), _("\
5206 If nonzero, gdb will give control to the user when the dynamic linker\n\
5207 notifies gdb of shared library events. The most common event of interest\n\
5208 to the user would be loading/unloading of a new library."),
5210 show_stop_on_solib_events
,
5211 &setlist
, &showlist
);
5213 add_setshow_enum_cmd ("follow-fork-mode", class_run
,
5214 follow_fork_mode_kind_names
,
5215 &follow_fork_mode_string
, _("\
5216 Set debugger response to a program call of fork or vfork."), _("\
5217 Show debugger response to a program call of fork or vfork."), _("\
5218 A fork or vfork creates a new process. follow-fork-mode can be:\n\
5219 parent - the original process is debugged after a fork\n\
5220 child - the new process is debugged after a fork\n\
5221 The unfollowed process will continue to run.\n\
5222 By default, the debugger will follow the parent process."),
5224 show_follow_fork_mode_string
,
5225 &setlist
, &showlist
);
5227 add_setshow_enum_cmd ("scheduler-locking", class_run
,
5228 scheduler_enums
, &scheduler_mode
, _("\
5229 Set mode for locking scheduler during execution."), _("\
5230 Show mode for locking scheduler during execution."), _("\
5231 off == no locking (threads may preempt at any time)\n\
5232 on == full locking (no thread except the current thread may run)\n\
5233 step == scheduler locked during every single-step operation.\n\
5234 In this mode, no other thread may run during a step command.\n\
5235 Other threads may run while stepping over a function call ('next')."),
5236 set_schedlock_func
, /* traps on target vector */
5237 show_scheduler_mode
,
5238 &setlist
, &showlist
);
5240 add_setshow_boolean_cmd ("step-mode", class_run
, &step_stop_if_no_debug
, _("\
5241 Set mode of the step operation."), _("\
5242 Show mode of the step operation."), _("\
5243 When set, doing a step over a function without debug line information\n\
5244 will stop at the first instruction of that function. Otherwise, the\n\
5245 function is skipped and the step command stops at a different source line."),
5247 show_step_stop_if_no_debug
,
5248 &setlist
, &showlist
);
5250 add_setshow_enum_cmd ("displaced-stepping", class_run
,
5251 can_use_displaced_stepping_enum
,
5252 &can_use_displaced_stepping
, _("\
5253 Set debugger's willingness to use displaced stepping."), _("\
5254 Show debugger's willingness to use displaced stepping."), _("\
5255 If on, gdb will use displaced stepping to step over breakpoints if it is\n\
5256 supported by the target architecture. If off, gdb will not use displaced\n\
5257 stepping to step over breakpoints, even if such is supported by the target\n\
5258 architecture. If auto (which is the default), gdb will use displaced stepping\n\
5259 if the target architecture supports it and non-stop mode is active, but will not\n\
5260 use it in all-stop mode (see help set non-stop)."),
5262 show_can_use_displaced_stepping
,
5263 &setlist
, &showlist
);
5265 add_setshow_enum_cmd ("exec-direction", class_run
, exec_direction_names
,
5266 &exec_direction
, _("Set direction of execution.\n\
5267 Options are 'forward' or 'reverse'."),
5268 _("Show direction of execution (forward/reverse)."),
5269 _("Tells gdb whether to execute forward or backward."),
5270 set_exec_direction_func
, show_exec_direction_func
,
5271 &setlist
, &showlist
);
5273 /* ptid initializations */
5274 null_ptid
= ptid_build (0, 0, 0);
5275 minus_one_ptid
= ptid_build (-1, 0, 0);
5276 inferior_ptid
= null_ptid
;
5277 target_last_wait_ptid
= minus_one_ptid
;
5278 displaced_step_ptid
= null_ptid
;
5280 observer_attach_thread_ptid_changed (infrun_thread_ptid_changed
);
5281 observer_attach_thread_stop_requested (infrun_thread_stop_requested
);