1 /* Target-struct-independent code to start (run) and stop an inferior
4 Copyright (C) 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995,
5 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007,
6 2008, 2009 Free Software Foundation, Inc.
8 This file is part of GDB.
10 This program is free software; you can redistribute it and/or modify
11 it under the terms of the GNU General Public License as published by
12 the Free Software Foundation; either version 3 of the License, or
13 (at your option) any later version.
15 This program is distributed in the hope that it will be useful,
16 but WITHOUT ANY WARRANTY; without even the implied warranty of
17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 GNU General Public License for more details.
20 You should have received a copy of the GNU General Public License
21 along with this program. If not, see <http://www.gnu.org/licenses/>. */
24 #include "gdb_string.h"
29 #include "exceptions.h"
30 #include "breakpoint.h"
34 #include "cli/cli-script.h"
36 #include "gdbthread.h"
48 #include "gdb_assert.h"
49 #include "mi/mi-common.h"
50 #include "event-top.h"
52 /* Prototypes for local functions */
54 static void signals_info (char *, int);
56 static void handle_command (char *, int);
58 static void sig_print_info (enum target_signal
);
60 static void sig_print_header (void);
62 static void resume_cleanups (void *);
64 static int hook_stop_stub (void *);
66 static int restore_selected_frame (void *);
68 static void build_infrun (void);
70 static int follow_fork (void);
72 static void set_schedlock_func (char *args
, int from_tty
,
73 struct cmd_list_element
*c
);
75 static int currently_stepping (struct thread_info
*tp
);
77 static int currently_stepping_callback (struct thread_info
*tp
, void *data
);
79 static void xdb_handle_command (char *args
, int from_tty
);
81 static int prepare_to_proceed (int);
83 void _initialize_infrun (void);
85 /* When set, stop the 'step' command if we enter a function which has
86 no line number information. The normal behavior is that we step
87 over such function. */
88 int step_stop_if_no_debug
= 0;
90 show_step_stop_if_no_debug (struct ui_file
*file
, int from_tty
,
91 struct cmd_list_element
*c
, const char *value
)
93 fprintf_filtered (file
, _("Mode of the step operation is %s.\n"), value
);
96 /* In asynchronous mode, but simulating synchronous execution. */
98 int sync_execution
= 0;
100 /* wait_for_inferior and normal_stop use this to notify the user
101 when the inferior stopped in a different thread than it had been
104 static ptid_t previous_inferior_ptid
;
106 int debug_displaced
= 0;
108 show_debug_displaced (struct ui_file
*file
, int from_tty
,
109 struct cmd_list_element
*c
, const char *value
)
111 fprintf_filtered (file
, _("Displace stepping debugging is %s.\n"), value
);
114 static int debug_infrun
= 0;
116 show_debug_infrun (struct ui_file
*file
, int from_tty
,
117 struct cmd_list_element
*c
, const char *value
)
119 fprintf_filtered (file
, _("Inferior debugging is %s.\n"), value
);
122 /* If the program uses ELF-style shared libraries, then calls to
123 functions in shared libraries go through stubs, which live in a
124 table called the PLT (Procedure Linkage Table). The first time the
125 function is called, the stub sends control to the dynamic linker,
126 which looks up the function's real address, patches the stub so
127 that future calls will go directly to the function, and then passes
128 control to the function.
130 If we are stepping at the source level, we don't want to see any of
131 this --- we just want to skip over the stub and the dynamic linker.
132 The simple approach is to single-step until control leaves the
135 However, on some systems (e.g., Red Hat's 5.2 distribution) the
136 dynamic linker calls functions in the shared C library, so you
137 can't tell from the PC alone whether the dynamic linker is still
138 running. In this case, we use a step-resume breakpoint to get us
139 past the dynamic linker, as if we were using "next" to step over a
142 in_solib_dynsym_resolve_code() says whether we're in the dynamic
143 linker code or not. Normally, this means we single-step. However,
144 if SKIP_SOLIB_RESOLVER then returns non-zero, then its value is an
145 address where we can place a step-resume breakpoint to get past the
146 linker's symbol resolution function.
148 in_solib_dynsym_resolve_code() can generally be implemented in a
149 pretty portable way, by comparing the PC against the address ranges
150 of the dynamic linker's sections.
152 SKIP_SOLIB_RESOLVER is generally going to be system-specific, since
153 it depends on internal details of the dynamic linker. It's usually
154 not too hard to figure out where to put a breakpoint, but it
155 certainly isn't portable. SKIP_SOLIB_RESOLVER should do plenty of
156 sanity checking. If it can't figure things out, returning zero and
157 getting the (possibly confusing) stepping behavior is better than
158 signalling an error, which will obscure the change in the
161 /* This function returns TRUE if pc is the address of an instruction
162 that lies within the dynamic linker (such as the event hook, or the
165 This function must be used only when a dynamic linker event has
166 been caught, and the inferior is being stepped out of the hook, or
167 undefined results are guaranteed. */
169 #ifndef SOLIB_IN_DYNAMIC_LINKER
170 #define SOLIB_IN_DYNAMIC_LINKER(pid,pc) 0
174 /* Convert the #defines into values. This is temporary until wfi control
175 flow is completely sorted out. */
177 #ifndef CANNOT_STEP_HW_WATCHPOINTS
178 #define CANNOT_STEP_HW_WATCHPOINTS 0
180 #undef CANNOT_STEP_HW_WATCHPOINTS
181 #define CANNOT_STEP_HW_WATCHPOINTS 1
184 /* Tables of how to react to signals; the user sets them. */
186 static unsigned char *signal_stop
;
187 static unsigned char *signal_print
;
188 static unsigned char *signal_program
;
190 #define SET_SIGS(nsigs,sigs,flags) \
192 int signum = (nsigs); \
193 while (signum-- > 0) \
194 if ((sigs)[signum]) \
195 (flags)[signum] = 1; \
198 #define UNSET_SIGS(nsigs,sigs,flags) \
200 int signum = (nsigs); \
201 while (signum-- > 0) \
202 if ((sigs)[signum]) \
203 (flags)[signum] = 0; \
206 /* Value to pass to target_resume() to cause all threads to resume */
208 #define RESUME_ALL (pid_to_ptid (-1))
210 /* Command list pointer for the "stop" placeholder. */
212 static struct cmd_list_element
*stop_command
;
214 /* Function inferior was in as of last step command. */
216 static struct symbol
*step_start_function
;
218 /* Nonzero if we want to give control to the user when we're notified
219 of shared library events by the dynamic linker. */
220 static int stop_on_solib_events
;
222 show_stop_on_solib_events (struct ui_file
*file
, int from_tty
,
223 struct cmd_list_element
*c
, const char *value
)
225 fprintf_filtered (file
, _("Stopping for shared library events is %s.\n"),
229 /* Nonzero means expecting a trace trap
230 and should stop the inferior and return silently when it happens. */
234 /* Save register contents here when executing a "finish" command or are
235 about to pop a stack dummy frame, if-and-only-if proceed_to_finish is set.
236 Thus this contains the return value from the called function (assuming
237 values are returned in a register). */
239 struct regcache
*stop_registers
;
241 /* Nonzero after stop if current stack frame should be printed. */
243 static int stop_print_frame
;
245 /* This is a cached copy of the pid/waitstatus of the last event
246 returned by target_wait()/deprecated_target_wait_hook(). This
247 information is returned by get_last_target_status(). */
248 static ptid_t target_last_wait_ptid
;
249 static struct target_waitstatus target_last_waitstatus
;
251 static void context_switch (ptid_t ptid
);
253 void init_thread_stepping_state (struct thread_info
*tss
);
255 void init_infwait_state (void);
257 /* This is used to remember when a fork, vfork or exec event
258 was caught by a catchpoint, and thus the event is to be
259 followed at the next resume of the inferior, and not
263 enum target_waitkind kind
;
270 char *execd_pathname
;
274 static const char follow_fork_mode_child
[] = "child";
275 static const char follow_fork_mode_parent
[] = "parent";
277 static const char *follow_fork_mode_kind_names
[] = {
278 follow_fork_mode_child
,
279 follow_fork_mode_parent
,
283 static const char *follow_fork_mode_string
= follow_fork_mode_parent
;
285 show_follow_fork_mode_string (struct ui_file
*file
, int from_tty
,
286 struct cmd_list_element
*c
, const char *value
)
288 fprintf_filtered (file
, _("\
289 Debugger response to a program call of fork or vfork is \"%s\".\n"),
297 int follow_child
= (follow_fork_mode_string
== follow_fork_mode_child
);
299 return target_follow_fork (follow_child
);
303 follow_inferior_reset_breakpoints (void)
305 struct thread_info
*tp
= inferior_thread ();
307 /* Was there a step_resume breakpoint? (There was if the user
308 did a "next" at the fork() call.) If so, explicitly reset its
311 step_resumes are a form of bp that are made to be per-thread.
312 Since we created the step_resume bp when the parent process
313 was being debugged, and now are switching to the child process,
314 from the breakpoint package's viewpoint, that's a switch of
315 "threads". We must update the bp's notion of which thread
316 it is for, or it'll be ignored when it triggers. */
318 if (tp
->step_resume_breakpoint
)
319 breakpoint_re_set_thread (tp
->step_resume_breakpoint
);
321 /* Reinsert all breakpoints in the child. The user may have set
322 breakpoints after catching the fork, in which case those
323 were never set in the child, but only in the parent. This makes
324 sure the inserted breakpoints match the breakpoint list. */
326 breakpoint_re_set ();
327 insert_breakpoints ();
330 /* EXECD_PATHNAME is assumed to be non-NULL. */
333 follow_exec (ptid_t pid
, char *execd_pathname
)
335 struct target_ops
*tgt
;
336 struct thread_info
*th
= inferior_thread ();
338 /* This is an exec event that we actually wish to pay attention to.
339 Refresh our symbol table to the newly exec'd program, remove any
342 If there are breakpoints, they aren't really inserted now,
343 since the exec() transformed our inferior into a fresh set
346 We want to preserve symbolic breakpoints on the list, since
347 we have hopes that they can be reset after the new a.out's
348 symbol table is read.
350 However, any "raw" breakpoints must be removed from the list
351 (e.g., the solib bp's), since their address is probably invalid
354 And, we DON'T want to call delete_breakpoints() here, since
355 that may write the bp's "shadow contents" (the instruction
356 value that was overwritten witha TRAP instruction). Since
357 we now have a new a.out, those shadow contents aren't valid. */
358 update_breakpoints_after_exec ();
360 /* If there was one, it's gone now. We cannot truly step-to-next
361 statement through an exec(). */
362 th
->step_resume_breakpoint
= NULL
;
363 th
->step_range_start
= 0;
364 th
->step_range_end
= 0;
366 /* What is this a.out's name? */
367 printf_unfiltered (_("Executing new program: %s\n"), execd_pathname
);
369 /* We've followed the inferior through an exec. Therefore, the
370 inferior has essentially been killed & reborn. */
372 gdb_flush (gdb_stdout
);
374 breakpoint_init_inferior (inf_execd
);
376 if (gdb_sysroot
&& *gdb_sysroot
)
378 char *name
= alloca (strlen (gdb_sysroot
)
379 + strlen (execd_pathname
)
381 strcpy (name
, gdb_sysroot
);
382 strcat (name
, execd_pathname
);
383 execd_pathname
= name
;
386 /* That a.out is now the one to use. */
387 exec_file_attach (execd_pathname
, 0);
389 /* Reset the shared library package. This ensures that we get a
390 shlib event when the child reaches "_start", at which point the
391 dld will have had a chance to initialize the child. */
392 /* Also, loading a symbol file below may trigger symbol lookups, and
393 we don't want those to be satisfied by the libraries of the
394 previous incarnation of this process. */
395 no_shared_libraries (NULL
, 0);
397 /* Load the main file's symbols. */
398 symbol_file_add_main (execd_pathname
, 0);
400 #ifdef SOLIB_CREATE_INFERIOR_HOOK
401 SOLIB_CREATE_INFERIOR_HOOK (PIDGET (inferior_ptid
));
403 solib_create_inferior_hook ();
406 /* Reinsert all breakpoints. (Those which were symbolic have
407 been reset to the proper address in the new a.out, thanks
408 to symbol_file_command...) */
409 insert_breakpoints ();
411 /* The next resume of this inferior should bring it to the shlib
412 startup breakpoints. (If the user had also set bp's on
413 "main" from the old (parent) process, then they'll auto-
414 matically get reset there in the new process.) */
417 /* Non-zero if we just simulating a single-step. This is needed
418 because we cannot remove the breakpoints in the inferior process
419 until after the `wait' in `wait_for_inferior'. */
420 static int singlestep_breakpoints_inserted_p
= 0;
422 /* The thread we inserted single-step breakpoints for. */
423 static ptid_t singlestep_ptid
;
425 /* PC when we started this single-step. */
426 static CORE_ADDR singlestep_pc
;
428 /* If another thread hit the singlestep breakpoint, we save the original
429 thread here so that we can resume single-stepping it later. */
430 static ptid_t saved_singlestep_ptid
;
431 static int stepping_past_singlestep_breakpoint
;
433 /* If not equal to null_ptid, this means that after stepping over breakpoint
434 is finished, we need to switch to deferred_step_ptid, and step it.
436 The use case is when one thread has hit a breakpoint, and then the user
437 has switched to another thread and issued 'step'. We need to step over
438 breakpoint in the thread which hit the breakpoint, but then continue
439 stepping the thread user has selected. */
440 static ptid_t deferred_step_ptid
;
442 /* Displaced stepping. */
444 /* In non-stop debugging mode, we must take special care to manage
445 breakpoints properly; in particular, the traditional strategy for
446 stepping a thread past a breakpoint it has hit is unsuitable.
447 'Displaced stepping' is a tactic for stepping one thread past a
448 breakpoint it has hit while ensuring that other threads running
449 concurrently will hit the breakpoint as they should.
451 The traditional way to step a thread T off a breakpoint in a
452 multi-threaded program in all-stop mode is as follows:
454 a0) Initially, all threads are stopped, and breakpoints are not
456 a1) We single-step T, leaving breakpoints uninserted.
457 a2) We insert breakpoints, and resume all threads.
459 In non-stop debugging, however, this strategy is unsuitable: we
460 don't want to have to stop all threads in the system in order to
461 continue or step T past a breakpoint. Instead, we use displaced
464 n0) Initially, T is stopped, other threads are running, and
465 breakpoints are inserted.
466 n1) We copy the instruction "under" the breakpoint to a separate
467 location, outside the main code stream, making any adjustments
468 to the instruction, register, and memory state as directed by
470 n2) We single-step T over the instruction at its new location.
471 n3) We adjust the resulting register and memory state as directed
472 by T's architecture. This includes resetting T's PC to point
473 back into the main instruction stream.
476 This approach depends on the following gdbarch methods:
478 - gdbarch_max_insn_length and gdbarch_displaced_step_location
479 indicate where to copy the instruction, and how much space must
480 be reserved there. We use these in step n1.
482 - gdbarch_displaced_step_copy_insn copies a instruction to a new
483 address, and makes any necessary adjustments to the instruction,
484 register contents, and memory. We use this in step n1.
486 - gdbarch_displaced_step_fixup adjusts registers and memory after
487 we have successfuly single-stepped the instruction, to yield the
488 same effect the instruction would have had if we had executed it
489 at its original address. We use this in step n3.
491 - gdbarch_displaced_step_free_closure provides cleanup.
493 The gdbarch_displaced_step_copy_insn and
494 gdbarch_displaced_step_fixup functions must be written so that
495 copying an instruction with gdbarch_displaced_step_copy_insn,
496 single-stepping across the copied instruction, and then applying
497 gdbarch_displaced_insn_fixup should have the same effects on the
498 thread's memory and registers as stepping the instruction in place
499 would have. Exactly which responsibilities fall to the copy and
500 which fall to the fixup is up to the author of those functions.
502 See the comments in gdbarch.sh for details.
504 Note that displaced stepping and software single-step cannot
505 currently be used in combination, although with some care I think
506 they could be made to. Software single-step works by placing
507 breakpoints on all possible subsequent instructions; if the
508 displaced instruction is a PC-relative jump, those breakpoints
509 could fall in very strange places --- on pages that aren't
510 executable, or at addresses that are not proper instruction
511 boundaries. (We do generally let other threads run while we wait
512 to hit the software single-step breakpoint, and they might
513 encounter such a corrupted instruction.) One way to work around
514 this would be to have gdbarch_displaced_step_copy_insn fully
515 simulate the effect of PC-relative instructions (and return NULL)
516 on architectures that use software single-stepping.
518 In non-stop mode, we can have independent and simultaneous step
519 requests, so more than one thread may need to simultaneously step
520 over a breakpoint. The current implementation assumes there is
521 only one scratch space per process. In this case, we have to
522 serialize access to the scratch space. If thread A wants to step
523 over a breakpoint, but we are currently waiting for some other
524 thread to complete a displaced step, we leave thread A stopped and
525 place it in the displaced_step_request_queue. Whenever a displaced
526 step finishes, we pick the next thread in the queue and start a new
527 displaced step operation on it. See displaced_step_prepare and
528 displaced_step_fixup for details. */
530 /* If this is not null_ptid, this is the thread carrying out a
531 displaced single-step. This thread's state will require fixing up
532 once it has completed its step. */
533 static ptid_t displaced_step_ptid
;
535 struct displaced_step_request
538 struct displaced_step_request
*next
;
541 /* A queue of pending displaced stepping requests. */
542 struct displaced_step_request
*displaced_step_request_queue
;
544 /* The architecture the thread had when we stepped it. */
545 static struct gdbarch
*displaced_step_gdbarch
;
547 /* The closure provided gdbarch_displaced_step_copy_insn, to be used
548 for post-step cleanup. */
549 static struct displaced_step_closure
*displaced_step_closure
;
551 /* The address of the original instruction, and the copy we made. */
552 static CORE_ADDR displaced_step_original
, displaced_step_copy
;
554 /* Saved contents of copy area. */
555 static gdb_byte
*displaced_step_saved_copy
;
557 /* Enum strings for "set|show displaced-stepping". */
559 static const char can_use_displaced_stepping_auto
[] = "auto";
560 static const char can_use_displaced_stepping_on
[] = "on";
561 static const char can_use_displaced_stepping_off
[] = "off";
562 static const char *can_use_displaced_stepping_enum
[] =
564 can_use_displaced_stepping_auto
,
565 can_use_displaced_stepping_on
,
566 can_use_displaced_stepping_off
,
570 /* If ON, and the architecture supports it, GDB will use displaced
571 stepping to step over breakpoints. If OFF, or if the architecture
572 doesn't support it, GDB will instead use the traditional
573 hold-and-step approach. If AUTO (which is the default), GDB will
574 decide which technique to use to step over breakpoints depending on
575 which of all-stop or non-stop mode is active --- displaced stepping
576 in non-stop mode; hold-and-step in all-stop mode. */
578 static const char *can_use_displaced_stepping
=
579 can_use_displaced_stepping_auto
;
582 show_can_use_displaced_stepping (struct ui_file
*file
, int from_tty
,
583 struct cmd_list_element
*c
,
586 if (can_use_displaced_stepping
== can_use_displaced_stepping_auto
)
587 fprintf_filtered (file
, _("\
588 Debugger's willingness to use displaced stepping to step over \
589 breakpoints is %s (currently %s).\n"),
590 value
, non_stop
? "on" : "off");
592 fprintf_filtered (file
, _("\
593 Debugger's willingness to use displaced stepping to step over \
594 breakpoints is %s.\n"), value
);
597 /* Return non-zero if displaced stepping can/should be used to step
601 use_displaced_stepping (struct gdbarch
*gdbarch
)
603 return (((can_use_displaced_stepping
== can_use_displaced_stepping_auto
605 || can_use_displaced_stepping
== can_use_displaced_stepping_on
)
606 && gdbarch_displaced_step_copy_insn_p (gdbarch
));
609 /* Clean out any stray displaced stepping state. */
611 displaced_step_clear (void)
613 /* Indicate that there is no cleanup pending. */
614 displaced_step_ptid
= null_ptid
;
616 if (displaced_step_closure
)
618 gdbarch_displaced_step_free_closure (displaced_step_gdbarch
,
619 displaced_step_closure
);
620 displaced_step_closure
= NULL
;
625 cleanup_displaced_step_closure (void *ptr
)
627 struct displaced_step_closure
*closure
= ptr
;
629 gdbarch_displaced_step_free_closure (current_gdbarch
, closure
);
632 /* Dump LEN bytes at BUF in hex to FILE, followed by a newline. */
634 displaced_step_dump_bytes (struct ui_file
*file
,
640 for (i
= 0; i
< len
; i
++)
641 fprintf_unfiltered (file
, "%02x ", buf
[i
]);
642 fputs_unfiltered ("\n", file
);
645 /* Prepare to single-step, using displaced stepping.
647 Note that we cannot use displaced stepping when we have a signal to
648 deliver. If we have a signal to deliver and an instruction to step
649 over, then after the step, there will be no indication from the
650 target whether the thread entered a signal handler or ignored the
651 signal and stepped over the instruction successfully --- both cases
652 result in a simple SIGTRAP. In the first case we mustn't do a
653 fixup, and in the second case we must --- but we can't tell which.
654 Comments in the code for 'random signals' in handle_inferior_event
655 explain how we handle this case instead.
657 Returns 1 if preparing was successful -- this thread is going to be
658 stepped now; or 0 if displaced stepping this thread got queued. */
660 displaced_step_prepare (ptid_t ptid
)
662 struct cleanup
*old_cleanups
, *ignore_cleanups
;
663 struct regcache
*regcache
= get_thread_regcache (ptid
);
664 struct gdbarch
*gdbarch
= get_regcache_arch (regcache
);
665 CORE_ADDR original
, copy
;
667 struct displaced_step_closure
*closure
;
669 /* We should never reach this function if the architecture does not
670 support displaced stepping. */
671 gdb_assert (gdbarch_displaced_step_copy_insn_p (gdbarch
));
673 /* For the first cut, we're displaced stepping one thread at a
676 if (!ptid_equal (displaced_step_ptid
, null_ptid
))
678 /* Already waiting for a displaced step to finish. Defer this
679 request and place in queue. */
680 struct displaced_step_request
*req
, *new_req
;
683 fprintf_unfiltered (gdb_stdlog
,
684 "displaced: defering step of %s\n",
685 target_pid_to_str (ptid
));
687 new_req
= xmalloc (sizeof (*new_req
));
688 new_req
->ptid
= ptid
;
689 new_req
->next
= NULL
;
691 if (displaced_step_request_queue
)
693 for (req
= displaced_step_request_queue
;
700 displaced_step_request_queue
= new_req
;
707 fprintf_unfiltered (gdb_stdlog
,
708 "displaced: stepping %s now\n",
709 target_pid_to_str (ptid
));
712 displaced_step_clear ();
714 old_cleanups
= save_inferior_ptid ();
715 inferior_ptid
= ptid
;
717 original
= regcache_read_pc (regcache
);
719 copy
= gdbarch_displaced_step_location (gdbarch
);
720 len
= gdbarch_max_insn_length (gdbarch
);
722 /* Save the original contents of the copy area. */
723 displaced_step_saved_copy
= xmalloc (len
);
724 ignore_cleanups
= make_cleanup (free_current_contents
,
725 &displaced_step_saved_copy
);
726 read_memory (copy
, displaced_step_saved_copy
, len
);
729 fprintf_unfiltered (gdb_stdlog
, "displaced: saved 0x%s: ",
731 displaced_step_dump_bytes (gdb_stdlog
, displaced_step_saved_copy
, len
);
734 closure
= gdbarch_displaced_step_copy_insn (gdbarch
,
735 original
, copy
, regcache
);
737 /* We don't support the fully-simulated case at present. */
738 gdb_assert (closure
);
740 make_cleanup (cleanup_displaced_step_closure
, closure
);
742 /* Resume execution at the copy. */
743 regcache_write_pc (regcache
, copy
);
745 discard_cleanups (ignore_cleanups
);
747 do_cleanups (old_cleanups
);
750 fprintf_unfiltered (gdb_stdlog
, "displaced: displaced pc to 0x%s\n",
753 /* Save the information we need to fix things up if the step
755 displaced_step_ptid
= ptid
;
756 displaced_step_gdbarch
= gdbarch
;
757 displaced_step_closure
= closure
;
758 displaced_step_original
= original
;
759 displaced_step_copy
= copy
;
764 displaced_step_clear_cleanup (void *ignore
)
766 displaced_step_clear ();
770 write_memory_ptid (ptid_t ptid
, CORE_ADDR memaddr
, const gdb_byte
*myaddr
, int len
)
772 struct cleanup
*ptid_cleanup
= save_inferior_ptid ();
773 inferior_ptid
= ptid
;
774 write_memory (memaddr
, myaddr
, len
);
775 do_cleanups (ptid_cleanup
);
779 displaced_step_fixup (ptid_t event_ptid
, enum target_signal signal
)
781 struct cleanup
*old_cleanups
;
783 /* Was this event for the pid we displaced? */
784 if (ptid_equal (displaced_step_ptid
, null_ptid
)
785 || ! ptid_equal (displaced_step_ptid
, event_ptid
))
788 old_cleanups
= make_cleanup (displaced_step_clear_cleanup
, 0);
790 /* Restore the contents of the copy area. */
792 ULONGEST len
= gdbarch_max_insn_length (displaced_step_gdbarch
);
793 write_memory_ptid (displaced_step_ptid
, displaced_step_copy
,
794 displaced_step_saved_copy
, len
);
796 fprintf_unfiltered (gdb_stdlog
, "displaced: restored 0x%s\n",
797 paddr_nz (displaced_step_copy
));
800 /* Did the instruction complete successfully? */
801 if (signal
== TARGET_SIGNAL_TRAP
)
803 /* Fix up the resulting state. */
804 gdbarch_displaced_step_fixup (displaced_step_gdbarch
,
805 displaced_step_closure
,
806 displaced_step_original
,
808 get_thread_regcache (displaced_step_ptid
));
812 /* Since the instruction didn't complete, all we can do is
814 struct regcache
*regcache
= get_thread_regcache (event_ptid
);
815 CORE_ADDR pc
= regcache_read_pc (regcache
);
816 pc
= displaced_step_original
+ (pc
- displaced_step_copy
);
817 regcache_write_pc (regcache
, pc
);
820 do_cleanups (old_cleanups
);
822 displaced_step_ptid
= null_ptid
;
824 /* Are there any pending displaced stepping requests? If so, run
826 while (displaced_step_request_queue
)
828 struct displaced_step_request
*head
;
832 head
= displaced_step_request_queue
;
834 displaced_step_request_queue
= head
->next
;
837 context_switch (ptid
);
839 actual_pc
= read_pc ();
841 if (breakpoint_here_p (actual_pc
))
844 fprintf_unfiltered (gdb_stdlog
,
845 "displaced: stepping queued %s now\n",
846 target_pid_to_str (ptid
));
848 displaced_step_prepare (ptid
);
854 fprintf_unfiltered (gdb_stdlog
, "displaced: run 0x%s: ",
855 paddr_nz (actual_pc
));
856 read_memory (actual_pc
, buf
, sizeof (buf
));
857 displaced_step_dump_bytes (gdb_stdlog
, buf
, sizeof (buf
));
860 target_resume (ptid
, 1, TARGET_SIGNAL_0
);
862 /* Done, we're stepping a thread. */
868 struct thread_info
*tp
= inferior_thread ();
870 /* The breakpoint we were sitting under has since been
872 tp
->trap_expected
= 0;
874 /* Go back to what we were trying to do. */
875 step
= currently_stepping (tp
);
878 fprintf_unfiltered (gdb_stdlog
, "breakpoint is gone %s: step(%d)\n",
879 target_pid_to_str (tp
->ptid
), step
);
881 target_resume (ptid
, step
, TARGET_SIGNAL_0
);
882 tp
->stop_signal
= TARGET_SIGNAL_0
;
884 /* This request was discarded. See if there's any other
885 thread waiting for its turn. */
890 /* Update global variables holding ptids to hold NEW_PTID if they were
893 infrun_thread_ptid_changed (ptid_t old_ptid
, ptid_t new_ptid
)
895 struct displaced_step_request
*it
;
897 if (ptid_equal (inferior_ptid
, old_ptid
))
898 inferior_ptid
= new_ptid
;
900 if (ptid_equal (singlestep_ptid
, old_ptid
))
901 singlestep_ptid
= new_ptid
;
903 if (ptid_equal (displaced_step_ptid
, old_ptid
))
904 displaced_step_ptid
= new_ptid
;
906 if (ptid_equal (deferred_step_ptid
, old_ptid
))
907 deferred_step_ptid
= new_ptid
;
909 for (it
= displaced_step_request_queue
; it
; it
= it
->next
)
910 if (ptid_equal (it
->ptid
, old_ptid
))
917 /* Things to clean up if we QUIT out of resume (). */
919 resume_cleanups (void *ignore
)
924 static const char schedlock_off
[] = "off";
925 static const char schedlock_on
[] = "on";
926 static const char schedlock_step
[] = "step";
927 static const char *scheduler_enums
[] = {
933 static const char *scheduler_mode
= schedlock_off
;
935 show_scheduler_mode (struct ui_file
*file
, int from_tty
,
936 struct cmd_list_element
*c
, const char *value
)
938 fprintf_filtered (file
, _("\
939 Mode for locking scheduler during execution is \"%s\".\n"),
944 set_schedlock_func (char *args
, int from_tty
, struct cmd_list_element
*c
)
946 if (!target_can_lock_scheduler
)
948 scheduler_mode
= schedlock_off
;
949 error (_("Target '%s' cannot support this command."), target_shortname
);
954 /* Resume the inferior, but allow a QUIT. This is useful if the user
955 wants to interrupt some lengthy single-stepping operation
956 (for child processes, the SIGINT goes to the inferior, and so
957 we get a SIGINT random_signal, but for remote debugging and perhaps
958 other targets, that's not true).
960 STEP nonzero if we should step (zero to continue instead).
961 SIG is the signal to give the inferior (zero for none). */
963 resume (int step
, enum target_signal sig
)
965 int should_resume
= 1;
966 struct cleanup
*old_cleanups
= make_cleanup (resume_cleanups
, 0);
968 /* Note that these must be reset if we follow a fork below. */
969 struct regcache
*regcache
= get_current_regcache ();
970 struct gdbarch
*gdbarch
= get_regcache_arch (regcache
);
971 struct thread_info
*tp
= inferior_thread ();
972 CORE_ADDR pc
= regcache_read_pc (regcache
);
977 fprintf_unfiltered (gdb_stdlog
,
978 "infrun: resume (step=%d, signal=%d), "
979 "trap_expected=%d\n",
980 step
, sig
, tp
->trap_expected
);
982 /* Some targets (e.g. Solaris x86) have a kernel bug when stepping
983 over an instruction that causes a page fault without triggering
984 a hardware watchpoint. The kernel properly notices that it shouldn't
985 stop, because the hardware watchpoint is not triggered, but it forgets
986 the step request and continues the program normally.
987 Work around the problem by removing hardware watchpoints if a step is
988 requested, GDB will check for a hardware watchpoint trigger after the
990 if (CANNOT_STEP_HW_WATCHPOINTS
&& step
)
991 remove_hw_watchpoints ();
994 /* Normally, by the time we reach `resume', the breakpoints are either
995 removed or inserted, as appropriate. The exception is if we're sitting
996 at a permanent breakpoint; we need to step over it, but permanent
997 breakpoints can't be removed. So we have to test for it here. */
998 if (breakpoint_here_p (pc
) == permanent_breakpoint_here
)
1000 if (gdbarch_skip_permanent_breakpoint_p (gdbarch
))
1001 gdbarch_skip_permanent_breakpoint (gdbarch
, regcache
);
1004 The program is stopped at a permanent breakpoint, but GDB does not know\n\
1005 how to step past a permanent breakpoint on this architecture. Try using\n\
1006 a command like `return' or `jump' to continue execution."));
1009 /* If enabled, step over breakpoints by executing a copy of the
1010 instruction at a different address.
1012 We can't use displaced stepping when we have a signal to deliver;
1013 the comments for displaced_step_prepare explain why. The
1014 comments in the handle_inferior event for dealing with 'random
1015 signals' explain what we do instead. */
1016 if (use_displaced_stepping (gdbarch
)
1017 && tp
->trap_expected
1018 && sig
== TARGET_SIGNAL_0
)
1020 if (!displaced_step_prepare (inferior_ptid
))
1022 /* Got placed in displaced stepping queue. Will be resumed
1023 later when all the currently queued displaced stepping
1024 requests finish. The thread is not executing at this point,
1025 and the call to set_executing will be made later. But we
1026 need to call set_running here, since from frontend point of view,
1027 the thread is running. */
1028 set_running (inferior_ptid
, 1);
1029 discard_cleanups (old_cleanups
);
1034 if (step
&& gdbarch_software_single_step_p (gdbarch
))
1036 /* Do it the hard way, w/temp breakpoints */
1037 if (gdbarch_software_single_step (gdbarch
, get_current_frame ()))
1039 /* ...and don't ask hardware to do it. */
1041 /* and do not pull these breakpoints until after a `wait' in
1042 `wait_for_inferior' */
1043 singlestep_breakpoints_inserted_p
= 1;
1044 singlestep_ptid
= inferior_ptid
;
1049 /* If there were any forks/vforks/execs that were caught and are
1050 now to be followed, then do so. */
1051 switch (pending_follow
.kind
)
1053 case TARGET_WAITKIND_FORKED
:
1054 case TARGET_WAITKIND_VFORKED
:
1055 pending_follow
.kind
= TARGET_WAITKIND_SPURIOUS
;
1059 /* Following a child fork will change our notion of current
1061 tp
= inferior_thread ();
1062 regcache
= get_current_regcache ();
1063 gdbarch
= get_regcache_arch (regcache
);
1064 pc
= regcache_read_pc (regcache
);
1067 case TARGET_WAITKIND_EXECD
:
1068 /* follow_exec is called as soon as the exec event is seen. */
1069 pending_follow
.kind
= TARGET_WAITKIND_SPURIOUS
;
1076 /* Install inferior's terminal modes. */
1077 target_terminal_inferior ();
1083 resume_ptid
= RESUME_ALL
; /* Default */
1085 /* If STEP is set, it's a request to use hardware stepping
1086 facilities. But in that case, we should never
1087 use singlestep breakpoint. */
1088 gdb_assert (!(singlestep_breakpoints_inserted_p
&& step
));
1090 if (singlestep_breakpoints_inserted_p
1091 && stepping_past_singlestep_breakpoint
)
1093 /* The situation here is as follows. In thread T1 we wanted to
1094 single-step. Lacking hardware single-stepping we've
1095 set breakpoint at the PC of the next instruction -- call it
1096 P. After resuming, we've hit that breakpoint in thread T2.
1097 Now we've removed original breakpoint, inserted breakpoint
1098 at P+1, and try to step to advance T2 past breakpoint.
1099 We need to step only T2, as if T1 is allowed to freely run,
1100 it can run past P, and if other threads are allowed to run,
1101 they can hit breakpoint at P+1, and nested hits of single-step
1102 breakpoints is not something we'd want -- that's complicated
1103 to support, and has no value. */
1104 resume_ptid
= inferior_ptid
;
1107 if ((step
|| singlestep_breakpoints_inserted_p
)
1108 && tp
->trap_expected
)
1110 /* We're allowing a thread to run past a breakpoint it has
1111 hit, by single-stepping the thread with the breakpoint
1112 removed. In which case, we need to single-step only this
1113 thread, and keep others stopped, as they can miss this
1114 breakpoint if allowed to run.
1116 The current code actually removes all breakpoints when
1117 doing this, not just the one being stepped over, so if we
1118 let other threads run, we can actually miss any
1119 breakpoint, not just the one at PC. */
1120 resume_ptid
= inferior_ptid
;
1125 /* With non-stop mode on, threads are always handled
1127 resume_ptid
= inferior_ptid
;
1129 else if ((scheduler_mode
== schedlock_on
)
1130 || (scheduler_mode
== schedlock_step
1131 && (step
|| singlestep_breakpoints_inserted_p
)))
1133 /* User-settable 'scheduler' mode requires solo thread resume. */
1134 resume_ptid
= inferior_ptid
;
1137 if (gdbarch_cannot_step_breakpoint (gdbarch
))
1139 /* Most targets can step a breakpoint instruction, thus
1140 executing it normally. But if this one cannot, just
1141 continue and we will hit it anyway. */
1142 if (step
&& breakpoint_inserted_here_p (pc
))
1147 && use_displaced_stepping (gdbarch
)
1148 && tp
->trap_expected
)
1150 struct regcache
*resume_regcache
= get_thread_regcache (resume_ptid
);
1151 CORE_ADDR actual_pc
= regcache_read_pc (resume_regcache
);
1154 fprintf_unfiltered (gdb_stdlog
, "displaced: run 0x%s: ",
1155 paddr_nz (actual_pc
));
1156 read_memory (actual_pc
, buf
, sizeof (buf
));
1157 displaced_step_dump_bytes (gdb_stdlog
, buf
, sizeof (buf
));
1160 /* Avoid confusing the next resume, if the next stop/resume
1161 happens to apply to another thread. */
1162 tp
->stop_signal
= TARGET_SIGNAL_0
;
1164 target_resume (resume_ptid
, step
, sig
);
1167 discard_cleanups (old_cleanups
);
1172 /* Clear out all variables saying what to do when inferior is continued.
1173 First do this, then set the ones you want, then call `proceed'. */
1176 clear_proceed_status_thread (struct thread_info
*tp
)
1179 fprintf_unfiltered (gdb_stdlog
,
1180 "infrun: clear_proceed_status_thread (%s)\n",
1181 target_pid_to_str (tp
->ptid
));
1183 tp
->trap_expected
= 0;
1184 tp
->step_range_start
= 0;
1185 tp
->step_range_end
= 0;
1186 tp
->step_frame_id
= null_frame_id
;
1187 tp
->step_over_calls
= STEP_OVER_UNDEBUGGABLE
;
1188 tp
->stop_requested
= 0;
1192 tp
->proceed_to_finish
= 0;
1194 /* Discard any remaining commands or status from previous stop. */
1195 bpstat_clear (&tp
->stop_bpstat
);
1199 clear_proceed_status_callback (struct thread_info
*tp
, void *data
)
1201 if (is_exited (tp
->ptid
))
1204 clear_proceed_status_thread (tp
);
1209 clear_proceed_status (void)
1211 if (!ptid_equal (inferior_ptid
, null_ptid
))
1213 struct inferior
*inferior
;
1217 /* If in non-stop mode, only delete the per-thread status
1218 of the current thread. */
1219 clear_proceed_status_thread (inferior_thread ());
1223 /* In all-stop mode, delete the per-thread status of
1225 iterate_over_threads (clear_proceed_status_callback
, NULL
);
1228 inferior
= current_inferior ();
1229 inferior
->stop_soon
= NO_STOP_QUIETLY
;
1232 stop_after_trap
= 0;
1233 breakpoint_proceeded
= 1; /* We're about to proceed... */
1237 regcache_xfree (stop_registers
);
1238 stop_registers
= NULL
;
1242 /* This should be suitable for any targets that support threads. */
1245 prepare_to_proceed (int step
)
1248 struct target_waitstatus wait_status
;
1250 /* Get the last target status returned by target_wait(). */
1251 get_last_target_status (&wait_ptid
, &wait_status
);
1253 /* Make sure we were stopped at a breakpoint. */
1254 if (wait_status
.kind
!= TARGET_WAITKIND_STOPPED
1255 || wait_status
.value
.sig
!= TARGET_SIGNAL_TRAP
)
1260 /* Switched over from WAIT_PID. */
1261 if (!ptid_equal (wait_ptid
, minus_one_ptid
)
1262 && !ptid_equal (inferior_ptid
, wait_ptid
))
1264 struct regcache
*regcache
= get_thread_regcache (wait_ptid
);
1266 if (breakpoint_here_p (regcache_read_pc (regcache
)))
1268 /* If stepping, remember current thread to switch back to. */
1270 deferred_step_ptid
= inferior_ptid
;
1272 /* Switch back to WAIT_PID thread. */
1273 switch_to_thread (wait_ptid
);
1275 /* We return 1 to indicate that there is a breakpoint here,
1276 so we need to step over it before continuing to avoid
1277 hitting it straight away. */
1285 /* Basic routine for continuing the program in various fashions.
1287 ADDR is the address to resume at, or -1 for resume where stopped.
1288 SIGGNAL is the signal to give it, or 0 for none,
1289 or -1 for act according to how it stopped.
1290 STEP is nonzero if should trap after one instruction.
1291 -1 means return after that and print nothing.
1292 You should probably set various step_... variables
1293 before calling here, if you are stepping.
1295 You should call clear_proceed_status before calling proceed. */
1298 proceed (CORE_ADDR addr
, enum target_signal siggnal
, int step
)
1300 struct regcache
*regcache
= get_current_regcache ();
1301 struct gdbarch
*gdbarch
= get_regcache_arch (regcache
);
1302 struct thread_info
*tp
;
1303 CORE_ADDR pc
= regcache_read_pc (regcache
);
1307 step_start_function
= find_pc_function (pc
);
1309 stop_after_trap
= 1;
1311 if (addr
== (CORE_ADDR
) -1)
1313 if (pc
== stop_pc
&& breakpoint_here_p (pc
)
1314 && execution_direction
!= EXEC_REVERSE
)
1315 /* There is a breakpoint at the address we will resume at,
1316 step one instruction before inserting breakpoints so that
1317 we do not stop right away (and report a second hit at this
1320 Note, we don't do this in reverse, because we won't
1321 actually be executing the breakpoint insn anyway.
1322 We'll be (un-)executing the previous instruction. */
1325 else if (gdbarch_single_step_through_delay_p (gdbarch
)
1326 && gdbarch_single_step_through_delay (gdbarch
,
1327 get_current_frame ()))
1328 /* We stepped onto an instruction that needs to be stepped
1329 again before re-inserting the breakpoint, do so. */
1334 regcache_write_pc (regcache
, addr
);
1338 fprintf_unfiltered (gdb_stdlog
,
1339 "infrun: proceed (addr=0x%s, signal=%d, step=%d)\n",
1340 paddr_nz (addr
), siggnal
, step
);
1343 /* In non-stop, each thread is handled individually. The context
1344 must already be set to the right thread here. */
1348 /* In a multi-threaded task we may select another thread and
1349 then continue or step.
1351 But if the old thread was stopped at a breakpoint, it will
1352 immediately cause another breakpoint stop without any
1353 execution (i.e. it will report a breakpoint hit incorrectly).
1354 So we must step over it first.
1356 prepare_to_proceed checks the current thread against the
1357 thread that reported the most recent event. If a step-over
1358 is required it returns TRUE and sets the current thread to
1360 if (prepare_to_proceed (step
))
1364 /* prepare_to_proceed may change the current thread. */
1365 tp
= inferior_thread ();
1369 tp
->trap_expected
= 1;
1370 /* If displaced stepping is enabled, we can step over the
1371 breakpoint without hitting it, so leave all breakpoints
1372 inserted. Otherwise we need to disable all breakpoints, step
1373 one instruction, and then re-add them when that step is
1375 if (!use_displaced_stepping (gdbarch
))
1376 remove_breakpoints ();
1379 /* We can insert breakpoints if we're not trying to step over one,
1380 or if we are stepping over one but we're using displaced stepping
1382 if (! tp
->trap_expected
|| use_displaced_stepping (gdbarch
))
1383 insert_breakpoints ();
1387 /* Pass the last stop signal to the thread we're resuming,
1388 irrespective of whether the current thread is the thread that
1389 got the last event or not. This was historically GDB's
1390 behaviour before keeping a stop_signal per thread. */
1392 struct thread_info
*last_thread
;
1394 struct target_waitstatus last_status
;
1396 get_last_target_status (&last_ptid
, &last_status
);
1397 if (!ptid_equal (inferior_ptid
, last_ptid
)
1398 && !ptid_equal (last_ptid
, null_ptid
)
1399 && !ptid_equal (last_ptid
, minus_one_ptid
))
1401 last_thread
= find_thread_pid (last_ptid
);
1404 tp
->stop_signal
= last_thread
->stop_signal
;
1405 last_thread
->stop_signal
= TARGET_SIGNAL_0
;
1410 if (siggnal
!= TARGET_SIGNAL_DEFAULT
)
1411 tp
->stop_signal
= siggnal
;
1412 /* If this signal should not be seen by program,
1413 give it zero. Used for debugging signals. */
1414 else if (!signal_program
[tp
->stop_signal
])
1415 tp
->stop_signal
= TARGET_SIGNAL_0
;
1417 annotate_starting ();
1419 /* Make sure that output from GDB appears before output from the
1421 gdb_flush (gdb_stdout
);
1423 /* Refresh prev_pc value just prior to resuming. This used to be
1424 done in stop_stepping, however, setting prev_pc there did not handle
1425 scenarios such as inferior function calls or returning from
1426 a function via the return command. In those cases, the prev_pc
1427 value was not set properly for subsequent commands. The prev_pc value
1428 is used to initialize the starting line number in the ecs. With an
1429 invalid value, the gdb next command ends up stopping at the position
1430 represented by the next line table entry past our start position.
1431 On platforms that generate one line table entry per line, this
1432 is not a problem. However, on the ia64, the compiler generates
1433 extraneous line table entries that do not increase the line number.
1434 When we issue the gdb next command on the ia64 after an inferior call
1435 or a return command, we often end up a few instructions forward, still
1436 within the original line we started.
1438 An attempt was made to have init_execution_control_state () refresh
1439 the prev_pc value before calculating the line number. This approach
1440 did not work because on platforms that use ptrace, the pc register
1441 cannot be read unless the inferior is stopped. At that point, we
1442 are not guaranteed the inferior is stopped and so the regcache_read_pc ()
1443 call can fail. Setting the prev_pc value here ensures the value is
1444 updated correctly when the inferior is stopped. */
1445 tp
->prev_pc
= regcache_read_pc (get_current_regcache ());
1447 /* Fill in with reasonable starting values. */
1448 init_thread_stepping_state (tp
);
1450 /* Reset to normal state. */
1451 init_infwait_state ();
1453 /* Resume inferior. */
1454 resume (oneproc
|| step
|| bpstat_should_step (), tp
->stop_signal
);
1456 /* Wait for it to stop (if not standalone)
1457 and in any case decode why it stopped, and act accordingly. */
1458 /* Do this only if we are not using the event loop, or if the target
1459 does not support asynchronous execution. */
1460 if (!target_can_async_p ())
1462 wait_for_inferior (0);
1468 /* Start remote-debugging of a machine over a serial link. */
1471 start_remote (int from_tty
)
1473 struct inferior
*inferior
;
1474 init_wait_for_inferior ();
1476 inferior
= current_inferior ();
1477 inferior
->stop_soon
= STOP_QUIETLY_REMOTE
;
1479 /* Always go on waiting for the target, regardless of the mode. */
1480 /* FIXME: cagney/1999-09-23: At present it isn't possible to
1481 indicate to wait_for_inferior that a target should timeout if
1482 nothing is returned (instead of just blocking). Because of this,
1483 targets expecting an immediate response need to, internally, set
1484 things up so that the target_wait() is forced to eventually
1486 /* FIXME: cagney/1999-09-24: It isn't possible for target_open() to
1487 differentiate to its caller what the state of the target is after
1488 the initial open has been performed. Here we're assuming that
1489 the target has stopped. It should be possible to eventually have
1490 target_open() return to the caller an indication that the target
1491 is currently running and GDB state should be set to the same as
1492 for an async run. */
1493 wait_for_inferior (0);
1495 /* Now that the inferior has stopped, do any bookkeeping like
1496 loading shared libraries. We want to do this before normal_stop,
1497 so that the displayed frame is up to date. */
1498 post_create_inferior (¤t_target
, from_tty
);
1503 /* Initialize static vars when a new inferior begins. */
1506 init_wait_for_inferior (void)
1508 /* These are meaningless until the first time through wait_for_inferior. */
1510 breakpoint_init_inferior (inf_starting
);
1512 /* The first resume is not following a fork/vfork/exec. */
1513 pending_follow
.kind
= TARGET_WAITKIND_SPURIOUS
; /* I.e., none. */
1515 clear_proceed_status ();
1517 stepping_past_singlestep_breakpoint
= 0;
1518 deferred_step_ptid
= null_ptid
;
1520 target_last_wait_ptid
= minus_one_ptid
;
1522 previous_inferior_ptid
= null_ptid
;
1523 init_infwait_state ();
1525 displaced_step_clear ();
1529 /* This enum encodes possible reasons for doing a target_wait, so that
1530 wfi can call target_wait in one place. (Ultimately the call will be
1531 moved out of the infinite loop entirely.) */
1535 infwait_normal_state
,
1536 infwait_thread_hop_state
,
1537 infwait_step_watch_state
,
1538 infwait_nonstep_watch_state
1541 /* Why did the inferior stop? Used to print the appropriate messages
1542 to the interface from within handle_inferior_event(). */
1543 enum inferior_stop_reason
1545 /* Step, next, nexti, stepi finished. */
1547 /* Inferior terminated by signal. */
1549 /* Inferior exited. */
1551 /* Inferior received signal, and user asked to be notified. */
1553 /* Reverse execution -- target ran out of history info. */
1557 /* The PTID we'll do a target_wait on.*/
1560 /* Current inferior wait state. */
1561 enum infwait_states infwait_state
;
1563 /* Data to be passed around while handling an event. This data is
1564 discarded between events. */
1565 struct execution_control_state
1568 /* The thread that got the event, if this was a thread event; NULL
1570 struct thread_info
*event_thread
;
1572 struct target_waitstatus ws
;
1574 CORE_ADDR stop_func_start
;
1575 CORE_ADDR stop_func_end
;
1576 char *stop_func_name
;
1577 int new_thread_event
;
1581 void init_execution_control_state (struct execution_control_state
*ecs
);
1583 void handle_inferior_event (struct execution_control_state
*ecs
);
1585 static void handle_step_into_function (struct execution_control_state
*ecs
);
1586 static void handle_step_into_function_backward (struct execution_control_state
*ecs
);
1587 static void insert_step_resume_breakpoint_at_frame (struct frame_info
*step_frame
);
1588 static void insert_step_resume_breakpoint_at_caller (struct frame_info
*);
1589 static void insert_step_resume_breakpoint_at_sal (struct symtab_and_line sr_sal
,
1590 struct frame_id sr_id
);
1591 static void insert_longjmp_resume_breakpoint (CORE_ADDR
);
1593 static void stop_stepping (struct execution_control_state
*ecs
);
1594 static void prepare_to_wait (struct execution_control_state
*ecs
);
1595 static void keep_going (struct execution_control_state
*ecs
);
1596 static void print_stop_reason (enum inferior_stop_reason stop_reason
,
1599 /* Callback for iterate over threads. If the thread is stopped, but
1600 the user/frontend doesn't know about that yet, go through
1601 normal_stop, as if the thread had just stopped now. ARG points at
1602 a ptid. If PTID is MINUS_ONE_PTID, applies to all threads. If
1603 ptid_is_pid(PTID) is true, applies to all threads of the process
1604 pointed at by PTID. Otherwise, apply only to the thread pointed by
1608 infrun_thread_stop_requested_callback (struct thread_info
*info
, void *arg
)
1610 ptid_t ptid
= * (ptid_t
*) arg
;
1612 if ((ptid_equal (info
->ptid
, ptid
)
1613 || ptid_equal (minus_one_ptid
, ptid
)
1614 || (ptid_is_pid (ptid
)
1615 && ptid_get_pid (ptid
) == ptid_get_pid (info
->ptid
)))
1616 && is_running (info
->ptid
)
1617 && !is_executing (info
->ptid
))
1619 struct cleanup
*old_chain
;
1620 struct execution_control_state ecss
;
1621 struct execution_control_state
*ecs
= &ecss
;
1623 memset (ecs
, 0, sizeof (*ecs
));
1625 old_chain
= make_cleanup_restore_current_thread ();
1627 switch_to_thread (info
->ptid
);
1629 /* Go through handle_inferior_event/normal_stop, so we always
1630 have consistent output as if the stop event had been
1632 ecs
->ptid
= info
->ptid
;
1633 ecs
->event_thread
= find_thread_pid (info
->ptid
);
1634 ecs
->ws
.kind
= TARGET_WAITKIND_STOPPED
;
1635 ecs
->ws
.value
.sig
= TARGET_SIGNAL_0
;
1637 handle_inferior_event (ecs
);
1639 if (!ecs
->wait_some_more
)
1641 struct thread_info
*tp
;
1645 /* Finish off the continuations. The continations
1646 themselves are responsible for realising the thread
1647 didn't finish what it was supposed to do. */
1648 tp
= inferior_thread ();
1649 do_all_intermediate_continuations_thread (tp
);
1650 do_all_continuations_thread (tp
);
1653 do_cleanups (old_chain
);
1659 /* This function is attached as a "thread_stop_requested" observer.
1660 Cleanup local state that assumed the PTID was to be resumed, and
1661 report the stop to the frontend. */
1664 infrun_thread_stop_requested (ptid_t ptid
)
1666 struct displaced_step_request
*it
, *next
, *prev
= NULL
;
1668 /* PTID was requested to stop. Remove it from the displaced
1669 stepping queue, so we don't try to resume it automatically. */
1670 for (it
= displaced_step_request_queue
; it
; it
= next
)
1674 if (ptid_equal (it
->ptid
, ptid
)
1675 || ptid_equal (minus_one_ptid
, ptid
)
1676 || (ptid_is_pid (ptid
)
1677 && ptid_get_pid (ptid
) == ptid_get_pid (it
->ptid
)))
1679 if (displaced_step_request_queue
== it
)
1680 displaced_step_request_queue
= it
->next
;
1682 prev
->next
= it
->next
;
1690 iterate_over_threads (infrun_thread_stop_requested_callback
, &ptid
);
1693 /* Callback for iterate_over_threads. */
1696 delete_step_resume_breakpoint_callback (struct thread_info
*info
, void *data
)
1698 if (is_exited (info
->ptid
))
1701 delete_step_resume_breakpoint (info
);
1705 /* In all-stop, delete the step resume breakpoint of any thread that
1706 had one. In non-stop, delete the step resume breakpoint of the
1707 thread that just stopped. */
1710 delete_step_thread_step_resume_breakpoint (void)
1712 if (!target_has_execution
1713 || ptid_equal (inferior_ptid
, null_ptid
))
1714 /* If the inferior has exited, we have already deleted the step
1715 resume breakpoints out of GDB's lists. */
1720 /* If in non-stop mode, only delete the step-resume or
1721 longjmp-resume breakpoint of the thread that just stopped
1723 struct thread_info
*tp
= inferior_thread ();
1724 delete_step_resume_breakpoint (tp
);
1727 /* In all-stop mode, delete all step-resume and longjmp-resume
1728 breakpoints of any thread that had them. */
1729 iterate_over_threads (delete_step_resume_breakpoint_callback
, NULL
);
1732 /* A cleanup wrapper. */
1735 delete_step_thread_step_resume_breakpoint_cleanup (void *arg
)
1737 delete_step_thread_step_resume_breakpoint ();
1740 /* Pretty print the results of target_wait, for debugging purposes. */
1743 print_target_wait_results (ptid_t waiton_ptid
, ptid_t result_ptid
,
1744 const struct target_waitstatus
*ws
)
1746 char *status_string
= target_waitstatus_to_string (ws
);
1747 struct ui_file
*tmp_stream
= mem_fileopen ();
1751 /* The text is split over several lines because it was getting too long.
1752 Call fprintf_unfiltered (gdb_stdlog) once so that the text is still
1753 output as a unit; we want only one timestamp printed if debug_timestamp
1756 fprintf_unfiltered (tmp_stream
,
1757 "infrun: target_wait (%d", PIDGET (waiton_ptid
));
1758 if (PIDGET (waiton_ptid
) != -1)
1759 fprintf_unfiltered (tmp_stream
,
1760 " [%s]", target_pid_to_str (waiton_ptid
));
1761 fprintf_unfiltered (tmp_stream
, ", status) =\n");
1762 fprintf_unfiltered (tmp_stream
,
1763 "infrun: %d [%s],\n",
1764 PIDGET (result_ptid
), target_pid_to_str (result_ptid
));
1765 fprintf_unfiltered (tmp_stream
,
1769 text
= ui_file_xstrdup (tmp_stream
, &len
);
1771 /* This uses %s in part to handle %'s in the text, but also to avoid
1772 a gcc error: the format attribute requires a string literal. */
1773 fprintf_unfiltered (gdb_stdlog
, "%s", text
);
1775 xfree (status_string
);
1777 ui_file_delete (tmp_stream
);
1780 /* Wait for control to return from inferior to debugger.
1782 If TREAT_EXEC_AS_SIGTRAP is non-zero, then handle EXEC signals
1783 as if they were SIGTRAP signals. This can be useful during
1784 the startup sequence on some targets such as HP/UX, where
1785 we receive an EXEC event instead of the expected SIGTRAP.
1787 If inferior gets a signal, we may decide to start it up again
1788 instead of returning. That is why there is a loop in this function.
1789 When this function actually returns it means the inferior
1790 should be left stopped and GDB should read more commands. */
1793 wait_for_inferior (int treat_exec_as_sigtrap
)
1795 struct cleanup
*old_cleanups
;
1796 struct execution_control_state ecss
;
1797 struct execution_control_state
*ecs
;
1801 (gdb_stdlog
, "infrun: wait_for_inferior (treat_exec_as_sigtrap=%d)\n",
1802 treat_exec_as_sigtrap
);
1805 make_cleanup (delete_step_thread_step_resume_breakpoint_cleanup
, NULL
);
1808 memset (ecs
, 0, sizeof (*ecs
));
1810 overlay_cache_invalid
= 1;
1812 /* We'll update this if & when we switch to a new thread. */
1813 previous_inferior_ptid
= inferior_ptid
;
1815 /* We have to invalidate the registers BEFORE calling target_wait
1816 because they can be loaded from the target while in target_wait.
1817 This makes remote debugging a bit more efficient for those
1818 targets that provide critical registers as part of their normal
1819 status mechanism. */
1821 registers_changed ();
1825 struct cleanup
*old_chain
;
1827 if (deprecated_target_wait_hook
)
1828 ecs
->ptid
= deprecated_target_wait_hook (waiton_ptid
, &ecs
->ws
);
1830 ecs
->ptid
= target_wait (waiton_ptid
, &ecs
->ws
);
1833 print_target_wait_results (waiton_ptid
, ecs
->ptid
, &ecs
->ws
);
1835 if (treat_exec_as_sigtrap
&& ecs
->ws
.kind
== TARGET_WAITKIND_EXECD
)
1837 xfree (ecs
->ws
.value
.execd_pathname
);
1838 ecs
->ws
.kind
= TARGET_WAITKIND_STOPPED
;
1839 ecs
->ws
.value
.sig
= TARGET_SIGNAL_TRAP
;
1842 /* If an error happens while handling the event, propagate GDB's
1843 knowledge of the executing state to the frontend/user running
1845 old_chain
= make_cleanup (finish_thread_state_cleanup
, &minus_one_ptid
);
1847 /* Now figure out what to do with the result of the result. */
1848 handle_inferior_event (ecs
);
1850 /* No error, don't finish the state yet. */
1851 discard_cleanups (old_chain
);
1853 if (!ecs
->wait_some_more
)
1857 do_cleanups (old_cleanups
);
1860 /* Asynchronous version of wait_for_inferior. It is called by the
1861 event loop whenever a change of state is detected on the file
1862 descriptor corresponding to the target. It can be called more than
1863 once to complete a single execution command. In such cases we need
1864 to keep the state in a global variable ECSS. If it is the last time
1865 that this function is called for a single execution command, then
1866 report to the user that the inferior has stopped, and do the
1867 necessary cleanups. */
1870 fetch_inferior_event (void *client_data
)
1872 struct execution_control_state ecss
;
1873 struct execution_control_state
*ecs
= &ecss
;
1874 struct cleanup
*old_chain
= make_cleanup (null_cleanup
, NULL
);
1875 struct cleanup
*ts_old_chain
;
1876 int was_sync
= sync_execution
;
1878 memset (ecs
, 0, sizeof (*ecs
));
1880 overlay_cache_invalid
= 1;
1882 /* We can only rely on wait_for_more being correct before handling
1883 the event in all-stop, but previous_inferior_ptid isn't used in
1885 if (!ecs
->wait_some_more
)
1886 /* We'll update this if & when we switch to a new thread. */
1887 previous_inferior_ptid
= inferior_ptid
;
1890 /* In non-stop mode, the user/frontend should not notice a thread
1891 switch due to internal events. Make sure we reverse to the
1892 user selected thread and frame after handling the event and
1893 running any breakpoint commands. */
1894 make_cleanup_restore_current_thread ();
1896 /* We have to invalidate the registers BEFORE calling target_wait
1897 because they can be loaded from the target while in target_wait.
1898 This makes remote debugging a bit more efficient for those
1899 targets that provide critical registers as part of their normal
1900 status mechanism. */
1902 registers_changed ();
1904 if (deprecated_target_wait_hook
)
1906 deprecated_target_wait_hook (waiton_ptid
, &ecs
->ws
);
1908 ecs
->ptid
= target_wait (waiton_ptid
, &ecs
->ws
);
1911 print_target_wait_results (waiton_ptid
, ecs
->ptid
, &ecs
->ws
);
1914 && ecs
->ws
.kind
!= TARGET_WAITKIND_IGNORE
1915 && ecs
->ws
.kind
!= TARGET_WAITKIND_EXITED
1916 && ecs
->ws
.kind
!= TARGET_WAITKIND_SIGNALLED
)
1917 /* In non-stop mode, each thread is handled individually. Switch
1918 early, so the global state is set correctly for this
1920 context_switch (ecs
->ptid
);
1922 /* If an error happens while handling the event, propagate GDB's
1923 knowledge of the executing state to the frontend/user running
1926 ts_old_chain
= make_cleanup (finish_thread_state_cleanup
, &minus_one_ptid
);
1928 ts_old_chain
= make_cleanup (finish_thread_state_cleanup
, &ecs
->ptid
);
1930 /* Now figure out what to do with the result of the result. */
1931 handle_inferior_event (ecs
);
1933 if (!ecs
->wait_some_more
)
1935 struct inferior
*inf
= find_inferior_pid (ptid_get_pid (ecs
->ptid
));
1937 delete_step_thread_step_resume_breakpoint ();
1939 /* We may not find an inferior if this was a process exit. */
1940 if (inf
== NULL
|| inf
->stop_soon
== NO_STOP_QUIETLY
)
1943 if (target_has_execution
1944 && ecs
->ws
.kind
!= TARGET_WAITKIND_EXITED
1945 && ecs
->ws
.kind
!= TARGET_WAITKIND_SIGNALLED
1946 && ecs
->event_thread
->step_multi
1947 && ecs
->event_thread
->stop_step
)
1948 inferior_event_handler (INF_EXEC_CONTINUE
, NULL
);
1950 inferior_event_handler (INF_EXEC_COMPLETE
, NULL
);
1953 /* No error, don't finish the thread states yet. */
1954 discard_cleanups (ts_old_chain
);
1956 /* Revert thread and frame. */
1957 do_cleanups (old_chain
);
1959 /* If the inferior was in sync execution mode, and now isn't,
1960 restore the prompt. */
1961 if (was_sync
&& !sync_execution
)
1962 display_gdb_prompt (0);
1965 /* Prepare an execution control state for looping through a
1966 wait_for_inferior-type loop. */
1969 init_execution_control_state (struct execution_control_state
*ecs
)
1971 ecs
->random_signal
= 0;
1974 /* Clear context switchable stepping state. */
1977 init_thread_stepping_state (struct thread_info
*tss
)
1979 struct symtab_and_line sal
;
1981 tss
->stepping_over_breakpoint
= 0;
1982 tss
->step_after_step_resume_breakpoint
= 0;
1983 tss
->stepping_through_solib_after_catch
= 0;
1984 tss
->stepping_through_solib_catchpoints
= NULL
;
1986 sal
= find_pc_line (tss
->prev_pc
, 0);
1987 tss
->current_line
= sal
.line
;
1988 tss
->current_symtab
= sal
.symtab
;
1991 /* Return the cached copy of the last pid/waitstatus returned by
1992 target_wait()/deprecated_target_wait_hook(). The data is actually
1993 cached by handle_inferior_event(), which gets called immediately
1994 after target_wait()/deprecated_target_wait_hook(). */
1997 get_last_target_status (ptid_t
*ptidp
, struct target_waitstatus
*status
)
1999 *ptidp
= target_last_wait_ptid
;
2000 *status
= target_last_waitstatus
;
2004 nullify_last_target_wait_ptid (void)
2006 target_last_wait_ptid
= minus_one_ptid
;
2009 /* Switch thread contexts. */
2012 context_switch (ptid_t ptid
)
2016 fprintf_unfiltered (gdb_stdlog
, "infrun: Switching context from %s ",
2017 target_pid_to_str (inferior_ptid
));
2018 fprintf_unfiltered (gdb_stdlog
, "to %s\n",
2019 target_pid_to_str (ptid
));
2022 switch_to_thread (ptid
);
2026 adjust_pc_after_break (struct execution_control_state
*ecs
)
2028 struct regcache
*regcache
;
2029 struct gdbarch
*gdbarch
;
2030 CORE_ADDR breakpoint_pc
;
2032 /* If we've hit a breakpoint, we'll normally be stopped with SIGTRAP. If
2033 we aren't, just return.
2035 We assume that waitkinds other than TARGET_WAITKIND_STOPPED are not
2036 affected by gdbarch_decr_pc_after_break. Other waitkinds which are
2037 implemented by software breakpoints should be handled through the normal
2040 NOTE drow/2004-01-31: On some targets, breakpoints may generate
2041 different signals (SIGILL or SIGEMT for instance), but it is less
2042 clear where the PC is pointing afterwards. It may not match
2043 gdbarch_decr_pc_after_break. I don't know any specific target that
2044 generates these signals at breakpoints (the code has been in GDB since at
2045 least 1992) so I can not guess how to handle them here.
2047 In earlier versions of GDB, a target with
2048 gdbarch_have_nonsteppable_watchpoint would have the PC after hitting a
2049 watchpoint affected by gdbarch_decr_pc_after_break. I haven't found any
2050 target with both of these set in GDB history, and it seems unlikely to be
2051 correct, so gdbarch_have_nonsteppable_watchpoint is not checked here. */
2053 if (ecs
->ws
.kind
!= TARGET_WAITKIND_STOPPED
)
2056 if (ecs
->ws
.value
.sig
!= TARGET_SIGNAL_TRAP
)
2059 /* In reverse execution, when a breakpoint is hit, the instruction
2060 under it has already been de-executed. The reported PC always
2061 points at the breakpoint address, so adjusting it further would
2062 be wrong. E.g., consider this case on a decr_pc_after_break == 1
2065 B1 0x08000000 : INSN1
2066 B2 0x08000001 : INSN2
2068 PC -> 0x08000003 : INSN4
2070 Say you're stopped at 0x08000003 as above. Reverse continuing
2071 from that point should hit B2 as below. Reading the PC when the
2072 SIGTRAP is reported should read 0x08000001 and INSN2 should have
2073 been de-executed already.
2075 B1 0x08000000 : INSN1
2076 B2 PC -> 0x08000001 : INSN2
2080 We can't apply the same logic as for forward execution, because
2081 we would wrongly adjust the PC to 0x08000000, since there's a
2082 breakpoint at PC - 1. We'd then report a hit on B1, although
2083 INSN1 hadn't been de-executed yet. Doing nothing is the correct
2085 if (execution_direction
== EXEC_REVERSE
)
2088 /* If this target does not decrement the PC after breakpoints, then
2089 we have nothing to do. */
2090 regcache
= get_thread_regcache (ecs
->ptid
);
2091 gdbarch
= get_regcache_arch (regcache
);
2092 if (gdbarch_decr_pc_after_break (gdbarch
) == 0)
2095 /* Find the location where (if we've hit a breakpoint) the
2096 breakpoint would be. */
2097 breakpoint_pc
= regcache_read_pc (regcache
)
2098 - gdbarch_decr_pc_after_break (gdbarch
);
2100 /* Check whether there actually is a software breakpoint inserted at
2103 If in non-stop mode, a race condition is possible where we've
2104 removed a breakpoint, but stop events for that breakpoint were
2105 already queued and arrive later. To suppress those spurious
2106 SIGTRAPs, we keep a list of such breakpoint locations for a bit,
2107 and retire them after a number of stop events are reported. */
2108 if (software_breakpoint_inserted_here_p (breakpoint_pc
)
2109 || (non_stop
&& moribund_breakpoint_here_p (breakpoint_pc
)))
2111 /* When using hardware single-step, a SIGTRAP is reported for both
2112 a completed single-step and a software breakpoint. Need to
2113 differentiate between the two, as the latter needs adjusting
2114 but the former does not.
2116 The SIGTRAP can be due to a completed hardware single-step only if
2117 - we didn't insert software single-step breakpoints
2118 - the thread to be examined is still the current thread
2119 - this thread is currently being stepped
2121 If any of these events did not occur, we must have stopped due
2122 to hitting a software breakpoint, and have to back up to the
2125 As a special case, we could have hardware single-stepped a
2126 software breakpoint. In this case (prev_pc == breakpoint_pc),
2127 we also need to back up to the breakpoint address. */
2129 if (singlestep_breakpoints_inserted_p
2130 || !ptid_equal (ecs
->ptid
, inferior_ptid
)
2131 || !currently_stepping (ecs
->event_thread
)
2132 || ecs
->event_thread
->prev_pc
== breakpoint_pc
)
2133 regcache_write_pc (regcache
, breakpoint_pc
);
2138 init_infwait_state (void)
2140 waiton_ptid
= pid_to_ptid (-1);
2141 infwait_state
= infwait_normal_state
;
2145 error_is_running (void)
2148 Cannot execute this command while the selected thread is running."));
2152 ensure_not_running (void)
2154 if (is_running (inferior_ptid
))
2155 error_is_running ();
2158 /* Given an execution control state that has been freshly filled in
2159 by an event from the inferior, figure out what it means and take
2160 appropriate action. */
2163 handle_inferior_event (struct execution_control_state
*ecs
)
2165 int sw_single_step_trap_p
= 0;
2166 int stopped_by_watchpoint
;
2167 int stepped_after_stopped_by_watchpoint
= 0;
2168 struct symtab_and_line stop_pc_sal
;
2169 enum stop_kind stop_soon
;
2171 if (ecs
->ws
.kind
!= TARGET_WAITKIND_EXITED
2172 && ecs
->ws
.kind
!= TARGET_WAITKIND_SIGNALLED
2173 && ecs
->ws
.kind
!= TARGET_WAITKIND_IGNORE
)
2175 struct inferior
*inf
= find_inferior_pid (ptid_get_pid (ecs
->ptid
));
2177 stop_soon
= inf
->stop_soon
;
2180 stop_soon
= NO_STOP_QUIETLY
;
2182 /* Cache the last pid/waitstatus. */
2183 target_last_wait_ptid
= ecs
->ptid
;
2184 target_last_waitstatus
= ecs
->ws
;
2186 /* Always clear state belonging to the previous time we stopped. */
2187 stop_stack_dummy
= 0;
2189 /* If it's a new process, add it to the thread database */
2191 ecs
->new_thread_event
= (!ptid_equal (ecs
->ptid
, inferior_ptid
)
2192 && !ptid_equal (ecs
->ptid
, minus_one_ptid
)
2193 && !in_thread_list (ecs
->ptid
));
2195 if (ecs
->ws
.kind
!= TARGET_WAITKIND_EXITED
2196 && ecs
->ws
.kind
!= TARGET_WAITKIND_SIGNALLED
&& ecs
->new_thread_event
)
2197 add_thread (ecs
->ptid
);
2199 ecs
->event_thread
= find_thread_pid (ecs
->ptid
);
2201 /* Dependent on valid ECS->EVENT_THREAD. */
2202 adjust_pc_after_break (ecs
);
2204 /* Dependent on the current PC value modified by adjust_pc_after_break. */
2205 reinit_frame_cache ();
2207 if (ecs
->ws
.kind
!= TARGET_WAITKIND_IGNORE
)
2209 breakpoint_retire_moribund ();
2211 /* Mark the non-executing threads accordingly. In all-stop, all
2212 threads of all processes are stopped when we get any event
2213 reported. In non-stop mode, only the event thread stops. If
2214 we're handling a process exit in non-stop mode, there's
2215 nothing to do, as threads of the dead process are gone, and
2216 threads of any other process were left running. */
2218 set_executing (minus_one_ptid
, 0);
2219 else if (ecs
->ws
.kind
!= TARGET_WAITKIND_SIGNALLED
2220 && ecs
->ws
.kind
!= TARGET_WAITKIND_EXITED
)
2221 set_executing (inferior_ptid
, 0);
2224 switch (infwait_state
)
2226 case infwait_thread_hop_state
:
2228 fprintf_unfiltered (gdb_stdlog
, "infrun: infwait_thread_hop_state\n");
2229 /* Cancel the waiton_ptid. */
2230 waiton_ptid
= pid_to_ptid (-1);
2233 case infwait_normal_state
:
2235 fprintf_unfiltered (gdb_stdlog
, "infrun: infwait_normal_state\n");
2238 case infwait_step_watch_state
:
2240 fprintf_unfiltered (gdb_stdlog
,
2241 "infrun: infwait_step_watch_state\n");
2243 stepped_after_stopped_by_watchpoint
= 1;
2246 case infwait_nonstep_watch_state
:
2248 fprintf_unfiltered (gdb_stdlog
,
2249 "infrun: infwait_nonstep_watch_state\n");
2250 insert_breakpoints ();
2252 /* FIXME-maybe: is this cleaner than setting a flag? Does it
2253 handle things like signals arriving and other things happening
2254 in combination correctly? */
2255 stepped_after_stopped_by_watchpoint
= 1;
2259 internal_error (__FILE__
, __LINE__
, _("bad switch"));
2261 infwait_state
= infwait_normal_state
;
2263 switch (ecs
->ws
.kind
)
2265 case TARGET_WAITKIND_LOADED
:
2267 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_LOADED\n");
2268 /* Ignore gracefully during startup of the inferior, as it might
2269 be the shell which has just loaded some objects, otherwise
2270 add the symbols for the newly loaded objects. Also ignore at
2271 the beginning of an attach or remote session; we will query
2272 the full list of libraries once the connection is
2274 if (stop_soon
== NO_STOP_QUIETLY
)
2276 /* Check for any newly added shared libraries if we're
2277 supposed to be adding them automatically. Switch
2278 terminal for any messages produced by
2279 breakpoint_re_set. */
2280 target_terminal_ours_for_output ();
2281 /* NOTE: cagney/2003-11-25: Make certain that the target
2282 stack's section table is kept up-to-date. Architectures,
2283 (e.g., PPC64), use the section table to perform
2284 operations such as address => section name and hence
2285 require the table to contain all sections (including
2286 those found in shared libraries). */
2287 /* NOTE: cagney/2003-11-25: Pass current_target and not
2288 exec_ops to SOLIB_ADD. This is because current GDB is
2289 only tooled to propagate section_table changes out from
2290 the "current_target" (see target_resize_to_sections), and
2291 not up from the exec stratum. This, of course, isn't
2292 right. "infrun.c" should only interact with the
2293 exec/process stratum, instead relying on the target stack
2294 to propagate relevant changes (stop, section table
2295 changed, ...) up to other layers. */
2297 SOLIB_ADD (NULL
, 0, ¤t_target
, auto_solib_add
);
2299 solib_add (NULL
, 0, ¤t_target
, auto_solib_add
);
2301 target_terminal_inferior ();
2303 /* If requested, stop when the dynamic linker notifies
2304 gdb of events. This allows the user to get control
2305 and place breakpoints in initializer routines for
2306 dynamically loaded objects (among other things). */
2307 if (stop_on_solib_events
)
2309 stop_stepping (ecs
);
2313 /* NOTE drow/2007-05-11: This might be a good place to check
2314 for "catch load". */
2317 /* If we are skipping through a shell, or through shared library
2318 loading that we aren't interested in, resume the program. If
2319 we're running the program normally, also resume. But stop if
2320 we're attaching or setting up a remote connection. */
2321 if (stop_soon
== STOP_QUIETLY
|| stop_soon
== NO_STOP_QUIETLY
)
2323 /* Loading of shared libraries might have changed breakpoint
2324 addresses. Make sure new breakpoints are inserted. */
2325 if (stop_soon
== NO_STOP_QUIETLY
2326 && !breakpoints_always_inserted_mode ())
2327 insert_breakpoints ();
2328 resume (0, TARGET_SIGNAL_0
);
2329 prepare_to_wait (ecs
);
2335 case TARGET_WAITKIND_SPURIOUS
:
2337 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_SPURIOUS\n");
2338 resume (0, TARGET_SIGNAL_0
);
2339 prepare_to_wait (ecs
);
2342 case TARGET_WAITKIND_EXITED
:
2344 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_EXITED\n");
2345 inferior_ptid
= ecs
->ptid
;
2346 target_terminal_ours (); /* Must do this before mourn anyway */
2347 print_stop_reason (EXITED
, ecs
->ws
.value
.integer
);
2349 /* Record the exit code in the convenience variable $_exitcode, so
2350 that the user can inspect this again later. */
2351 set_internalvar (lookup_internalvar ("_exitcode"),
2352 value_from_longest (builtin_type_int32
,
2353 (LONGEST
) ecs
->ws
.value
.integer
));
2354 gdb_flush (gdb_stdout
);
2355 target_mourn_inferior ();
2356 singlestep_breakpoints_inserted_p
= 0;
2357 stop_print_frame
= 0;
2358 stop_stepping (ecs
);
2361 case TARGET_WAITKIND_SIGNALLED
:
2363 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_SIGNALLED\n");
2364 inferior_ptid
= ecs
->ptid
;
2365 stop_print_frame
= 0;
2366 target_terminal_ours (); /* Must do this before mourn anyway */
2368 /* Note: By definition of TARGET_WAITKIND_SIGNALLED, we shouldn't
2369 reach here unless the inferior is dead. However, for years
2370 target_kill() was called here, which hints that fatal signals aren't
2371 really fatal on some systems. If that's true, then some changes
2373 target_mourn_inferior ();
2375 print_stop_reason (SIGNAL_EXITED
, ecs
->ws
.value
.sig
);
2376 singlestep_breakpoints_inserted_p
= 0;
2377 stop_stepping (ecs
);
2380 /* The following are the only cases in which we keep going;
2381 the above cases end in a continue or goto. */
2382 case TARGET_WAITKIND_FORKED
:
2383 case TARGET_WAITKIND_VFORKED
:
2385 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_FORKED\n");
2386 pending_follow
.kind
= ecs
->ws
.kind
;
2388 pending_follow
.fork_event
.parent_pid
= ecs
->ptid
;
2389 pending_follow
.fork_event
.child_pid
= ecs
->ws
.value
.related_pid
;
2391 if (!ptid_equal (ecs
->ptid
, inferior_ptid
))
2393 context_switch (ecs
->ptid
);
2394 reinit_frame_cache ();
2397 stop_pc
= read_pc ();
2399 ecs
->event_thread
->stop_bpstat
= bpstat_stop_status (stop_pc
, ecs
->ptid
);
2401 ecs
->random_signal
= !bpstat_explains_signal (ecs
->event_thread
->stop_bpstat
);
2403 /* If no catchpoint triggered for this, then keep going. */
2404 if (ecs
->random_signal
)
2406 ecs
->event_thread
->stop_signal
= TARGET_SIGNAL_0
;
2410 ecs
->event_thread
->stop_signal
= TARGET_SIGNAL_TRAP
;
2411 goto process_event_stop_test
;
2413 case TARGET_WAITKIND_EXECD
:
2415 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_EXECD\n");
2416 pending_follow
.execd_pathname
=
2417 savestring (ecs
->ws
.value
.execd_pathname
,
2418 strlen (ecs
->ws
.value
.execd_pathname
));
2420 if (!ptid_equal (ecs
->ptid
, inferior_ptid
))
2422 context_switch (ecs
->ptid
);
2423 reinit_frame_cache ();
2426 stop_pc
= read_pc ();
2428 /* This causes the eventpoints and symbol table to be reset.
2429 Must do this now, before trying to determine whether to
2431 follow_exec (inferior_ptid
, pending_follow
.execd_pathname
);
2432 xfree (pending_follow
.execd_pathname
);
2434 ecs
->event_thread
->stop_bpstat
= bpstat_stop_status (stop_pc
, ecs
->ptid
);
2435 ecs
->random_signal
= !bpstat_explains_signal (ecs
->event_thread
->stop_bpstat
);
2437 /* If no catchpoint triggered for this, then keep going. */
2438 if (ecs
->random_signal
)
2440 ecs
->event_thread
->stop_signal
= TARGET_SIGNAL_0
;
2444 ecs
->event_thread
->stop_signal
= TARGET_SIGNAL_TRAP
;
2445 goto process_event_stop_test
;
2447 /* Be careful not to try to gather much state about a thread
2448 that's in a syscall. It's frequently a losing proposition. */
2449 case TARGET_WAITKIND_SYSCALL_ENTRY
:
2451 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_SYSCALL_ENTRY\n");
2452 resume (0, TARGET_SIGNAL_0
);
2453 prepare_to_wait (ecs
);
2456 /* Before examining the threads further, step this thread to
2457 get it entirely out of the syscall. (We get notice of the
2458 event when the thread is just on the verge of exiting a
2459 syscall. Stepping one instruction seems to get it back
2461 case TARGET_WAITKIND_SYSCALL_RETURN
:
2463 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_SYSCALL_RETURN\n");
2464 target_resume (ecs
->ptid
, 1, TARGET_SIGNAL_0
);
2465 prepare_to_wait (ecs
);
2468 case TARGET_WAITKIND_STOPPED
:
2470 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_STOPPED\n");
2471 ecs
->event_thread
->stop_signal
= ecs
->ws
.value
.sig
;
2474 case TARGET_WAITKIND_NO_HISTORY
:
2475 /* Reverse execution: target ran out of history info. */
2476 stop_pc
= read_pc ();
2477 print_stop_reason (NO_HISTORY
, 0);
2478 stop_stepping (ecs
);
2481 /* We had an event in the inferior, but we are not interested
2482 in handling it at this level. The lower layers have already
2483 done what needs to be done, if anything.
2485 One of the possible circumstances for this is when the
2486 inferior produces output for the console. The inferior has
2487 not stopped, and we are ignoring the event. Another possible
2488 circumstance is any event which the lower level knows will be
2489 reported multiple times without an intervening resume. */
2490 case TARGET_WAITKIND_IGNORE
:
2492 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_IGNORE\n");
2493 prepare_to_wait (ecs
);
2497 if (ecs
->new_thread_event
)
2500 /* Non-stop assumes that the target handles adding new threads
2501 to the thread list. */
2502 internal_error (__FILE__
, __LINE__
, "\
2503 targets should add new threads to the thread list themselves in non-stop mode.");
2505 /* We may want to consider not doing a resume here in order to
2506 give the user a chance to play with the new thread. It might
2507 be good to make that a user-settable option. */
2509 /* At this point, all threads are stopped (happens automatically
2510 in either the OS or the native code). Therefore we need to
2511 continue all threads in order to make progress. */
2513 target_resume (RESUME_ALL
, 0, TARGET_SIGNAL_0
);
2514 prepare_to_wait (ecs
);
2518 if (ecs
->ws
.kind
== TARGET_WAITKIND_STOPPED
)
2520 /* Do we need to clean up the state of a thread that has
2521 completed a displaced single-step? (Doing so usually affects
2522 the PC, so do it here, before we set stop_pc.) */
2523 displaced_step_fixup (ecs
->ptid
, ecs
->event_thread
->stop_signal
);
2525 /* If we either finished a single-step or hit a breakpoint, but
2526 the user wanted this thread to be stopped, pretend we got a
2527 SIG0 (generic unsignaled stop). */
2529 if (ecs
->event_thread
->stop_requested
2530 && ecs
->event_thread
->stop_signal
== TARGET_SIGNAL_TRAP
)
2531 ecs
->event_thread
->stop_signal
= TARGET_SIGNAL_0
;
2534 stop_pc
= regcache_read_pc (get_thread_regcache (ecs
->ptid
));
2538 fprintf_unfiltered (gdb_stdlog
, "infrun: stop_pc = 0x%s\n",
2539 paddr_nz (stop_pc
));
2540 if (STOPPED_BY_WATCHPOINT (&ecs
->ws
))
2543 fprintf_unfiltered (gdb_stdlog
, "infrun: stopped by watchpoint\n");
2545 if (target_stopped_data_address (¤t_target
, &addr
))
2546 fprintf_unfiltered (gdb_stdlog
,
2547 "infrun: stopped data address = 0x%s\n",
2550 fprintf_unfiltered (gdb_stdlog
,
2551 "infrun: (no data address available)\n");
2555 if (stepping_past_singlestep_breakpoint
)
2557 gdb_assert (singlestep_breakpoints_inserted_p
);
2558 gdb_assert (ptid_equal (singlestep_ptid
, ecs
->ptid
));
2559 gdb_assert (!ptid_equal (singlestep_ptid
, saved_singlestep_ptid
));
2561 stepping_past_singlestep_breakpoint
= 0;
2563 /* We've either finished single-stepping past the single-step
2564 breakpoint, or stopped for some other reason. It would be nice if
2565 we could tell, but we can't reliably. */
2566 if (ecs
->event_thread
->stop_signal
== TARGET_SIGNAL_TRAP
)
2569 fprintf_unfiltered (gdb_stdlog
, "infrun: stepping_past_singlestep_breakpoint\n");
2570 /* Pull the single step breakpoints out of the target. */
2571 remove_single_step_breakpoints ();
2572 singlestep_breakpoints_inserted_p
= 0;
2574 ecs
->random_signal
= 0;
2576 context_switch (saved_singlestep_ptid
);
2577 if (deprecated_context_hook
)
2578 deprecated_context_hook (pid_to_thread_id (ecs
->ptid
));
2580 resume (1, TARGET_SIGNAL_0
);
2581 prepare_to_wait (ecs
);
2586 if (!ptid_equal (deferred_step_ptid
, null_ptid
))
2588 /* In non-stop mode, there's never a deferred_step_ptid set. */
2589 gdb_assert (!non_stop
);
2591 /* If we stopped for some other reason than single-stepping, ignore
2592 the fact that we were supposed to switch back. */
2593 if (ecs
->event_thread
->stop_signal
== TARGET_SIGNAL_TRAP
)
2596 fprintf_unfiltered (gdb_stdlog
,
2597 "infrun: handling deferred step\n");
2599 /* Pull the single step breakpoints out of the target. */
2600 if (singlestep_breakpoints_inserted_p
)
2602 remove_single_step_breakpoints ();
2603 singlestep_breakpoints_inserted_p
= 0;
2606 /* Note: We do not call context_switch at this point, as the
2607 context is already set up for stepping the original thread. */
2608 switch_to_thread (deferred_step_ptid
);
2609 deferred_step_ptid
= null_ptid
;
2610 /* Suppress spurious "Switching to ..." message. */
2611 previous_inferior_ptid
= inferior_ptid
;
2613 resume (1, TARGET_SIGNAL_0
);
2614 prepare_to_wait (ecs
);
2618 deferred_step_ptid
= null_ptid
;
2621 /* See if a thread hit a thread-specific breakpoint that was meant for
2622 another thread. If so, then step that thread past the breakpoint,
2625 if (ecs
->event_thread
->stop_signal
== TARGET_SIGNAL_TRAP
)
2627 int thread_hop_needed
= 0;
2629 /* Check if a regular breakpoint has been hit before checking
2630 for a potential single step breakpoint. Otherwise, GDB will
2631 not see this breakpoint hit when stepping onto breakpoints. */
2632 if (regular_breakpoint_inserted_here_p (stop_pc
))
2634 ecs
->random_signal
= 0;
2635 if (!breakpoint_thread_match (stop_pc
, ecs
->ptid
))
2636 thread_hop_needed
= 1;
2638 else if (singlestep_breakpoints_inserted_p
)
2640 /* We have not context switched yet, so this should be true
2641 no matter which thread hit the singlestep breakpoint. */
2642 gdb_assert (ptid_equal (inferior_ptid
, singlestep_ptid
));
2644 fprintf_unfiltered (gdb_stdlog
, "infrun: software single step "
2646 target_pid_to_str (ecs
->ptid
));
2648 ecs
->random_signal
= 0;
2649 /* The call to in_thread_list is necessary because PTIDs sometimes
2650 change when we go from single-threaded to multi-threaded. If
2651 the singlestep_ptid is still in the list, assume that it is
2652 really different from ecs->ptid. */
2653 if (!ptid_equal (singlestep_ptid
, ecs
->ptid
)
2654 && in_thread_list (singlestep_ptid
))
2656 /* If the PC of the thread we were trying to single-step
2657 has changed, discard this event (which we were going
2658 to ignore anyway), and pretend we saw that thread
2659 trap. This prevents us continuously moving the
2660 single-step breakpoint forward, one instruction at a
2661 time. If the PC has changed, then the thread we were
2662 trying to single-step has trapped or been signalled,
2663 but the event has not been reported to GDB yet.
2665 There might be some cases where this loses signal
2666 information, if a signal has arrived at exactly the
2667 same time that the PC changed, but this is the best
2668 we can do with the information available. Perhaps we
2669 should arrange to report all events for all threads
2670 when they stop, or to re-poll the remote looking for
2671 this particular thread (i.e. temporarily enable
2674 CORE_ADDR new_singlestep_pc
2675 = regcache_read_pc (get_thread_regcache (singlestep_ptid
));
2677 if (new_singlestep_pc
!= singlestep_pc
)
2679 enum target_signal stop_signal
;
2682 fprintf_unfiltered (gdb_stdlog
, "infrun: unexpected thread,"
2683 " but expected thread advanced also\n");
2685 /* The current context still belongs to
2686 singlestep_ptid. Don't swap here, since that's
2687 the context we want to use. Just fudge our
2688 state and continue. */
2689 stop_signal
= ecs
->event_thread
->stop_signal
;
2690 ecs
->event_thread
->stop_signal
= TARGET_SIGNAL_0
;
2691 ecs
->ptid
= singlestep_ptid
;
2692 ecs
->event_thread
= find_thread_pid (ecs
->ptid
);
2693 ecs
->event_thread
->stop_signal
= stop_signal
;
2694 stop_pc
= new_singlestep_pc
;
2699 fprintf_unfiltered (gdb_stdlog
,
2700 "infrun: unexpected thread\n");
2702 thread_hop_needed
= 1;
2703 stepping_past_singlestep_breakpoint
= 1;
2704 saved_singlestep_ptid
= singlestep_ptid
;
2709 if (thread_hop_needed
)
2711 int remove_status
= 0;
2714 fprintf_unfiltered (gdb_stdlog
, "infrun: thread_hop_needed\n");
2716 /* Saw a breakpoint, but it was hit by the wrong thread.
2719 if (singlestep_breakpoints_inserted_p
)
2721 /* Pull the single step breakpoints out of the target. */
2722 remove_single_step_breakpoints ();
2723 singlestep_breakpoints_inserted_p
= 0;
2726 /* If the arch can displace step, don't remove the
2728 if (!use_displaced_stepping (current_gdbarch
))
2729 remove_status
= remove_breakpoints ();
2731 /* Did we fail to remove breakpoints? If so, try
2732 to set the PC past the bp. (There's at least
2733 one situation in which we can fail to remove
2734 the bp's: On HP-UX's that use ttrace, we can't
2735 change the address space of a vforking child
2736 process until the child exits (well, okay, not
2737 then either :-) or execs. */
2738 if (remove_status
!= 0)
2739 error (_("Cannot step over breakpoint hit in wrong thread"));
2742 if (!ptid_equal (inferior_ptid
, ecs
->ptid
))
2743 context_switch (ecs
->ptid
);
2747 /* Only need to require the next event from this
2748 thread in all-stop mode. */
2749 waiton_ptid
= ecs
->ptid
;
2750 infwait_state
= infwait_thread_hop_state
;
2753 ecs
->event_thread
->stepping_over_breakpoint
= 1;
2755 registers_changed ();
2759 else if (singlestep_breakpoints_inserted_p
)
2761 sw_single_step_trap_p
= 1;
2762 ecs
->random_signal
= 0;
2766 ecs
->random_signal
= 1;
2768 /* See if something interesting happened to the non-current thread. If
2769 so, then switch to that thread. */
2770 if (!ptid_equal (ecs
->ptid
, inferior_ptid
))
2773 fprintf_unfiltered (gdb_stdlog
, "infrun: context switch\n");
2775 context_switch (ecs
->ptid
);
2777 if (deprecated_context_hook
)
2778 deprecated_context_hook (pid_to_thread_id (ecs
->ptid
));
2781 if (singlestep_breakpoints_inserted_p
)
2783 /* Pull the single step breakpoints out of the target. */
2784 remove_single_step_breakpoints ();
2785 singlestep_breakpoints_inserted_p
= 0;
2788 if (stepped_after_stopped_by_watchpoint
)
2789 stopped_by_watchpoint
= 0;
2791 stopped_by_watchpoint
= watchpoints_triggered (&ecs
->ws
);
2793 /* If necessary, step over this watchpoint. We'll be back to display
2795 if (stopped_by_watchpoint
2796 && (HAVE_STEPPABLE_WATCHPOINT
2797 || gdbarch_have_nonsteppable_watchpoint (current_gdbarch
)))
2799 /* At this point, we are stopped at an instruction which has
2800 attempted to write to a piece of memory under control of
2801 a watchpoint. The instruction hasn't actually executed
2802 yet. If we were to evaluate the watchpoint expression
2803 now, we would get the old value, and therefore no change
2804 would seem to have occurred.
2806 In order to make watchpoints work `right', we really need
2807 to complete the memory write, and then evaluate the
2808 watchpoint expression. We do this by single-stepping the
2811 It may not be necessary to disable the watchpoint to stop over
2812 it. For example, the PA can (with some kernel cooperation)
2813 single step over a watchpoint without disabling the watchpoint.
2815 It is far more common to need to disable a watchpoint to step
2816 the inferior over it. If we have non-steppable watchpoints,
2817 we must disable the current watchpoint; it's simplest to
2818 disable all watchpoints and breakpoints. */
2820 if (!HAVE_STEPPABLE_WATCHPOINT
)
2821 remove_breakpoints ();
2822 registers_changed ();
2823 target_resume (ecs
->ptid
, 1, TARGET_SIGNAL_0
); /* Single step */
2824 waiton_ptid
= ecs
->ptid
;
2825 if (HAVE_STEPPABLE_WATCHPOINT
)
2826 infwait_state
= infwait_step_watch_state
;
2828 infwait_state
= infwait_nonstep_watch_state
;
2829 prepare_to_wait (ecs
);
2833 ecs
->stop_func_start
= 0;
2834 ecs
->stop_func_end
= 0;
2835 ecs
->stop_func_name
= 0;
2836 /* Don't care about return value; stop_func_start and stop_func_name
2837 will both be 0 if it doesn't work. */
2838 find_pc_partial_function (stop_pc
, &ecs
->stop_func_name
,
2839 &ecs
->stop_func_start
, &ecs
->stop_func_end
);
2840 ecs
->stop_func_start
2841 += gdbarch_deprecated_function_start_offset (current_gdbarch
);
2842 ecs
->event_thread
->stepping_over_breakpoint
= 0;
2843 bpstat_clear (&ecs
->event_thread
->stop_bpstat
);
2844 ecs
->event_thread
->stop_step
= 0;
2845 stop_print_frame
= 1;
2846 ecs
->random_signal
= 0;
2847 stopped_by_random_signal
= 0;
2849 if (ecs
->event_thread
->stop_signal
== TARGET_SIGNAL_TRAP
2850 && ecs
->event_thread
->trap_expected
2851 && gdbarch_single_step_through_delay_p (current_gdbarch
)
2852 && currently_stepping (ecs
->event_thread
))
2854 /* We're trying to step off a breakpoint. Turns out that we're
2855 also on an instruction that needs to be stepped multiple
2856 times before it's been fully executing. E.g., architectures
2857 with a delay slot. It needs to be stepped twice, once for
2858 the instruction and once for the delay slot. */
2859 int step_through_delay
2860 = gdbarch_single_step_through_delay (current_gdbarch
,
2861 get_current_frame ());
2862 if (debug_infrun
&& step_through_delay
)
2863 fprintf_unfiltered (gdb_stdlog
, "infrun: step through delay\n");
2864 if (ecs
->event_thread
->step_range_end
== 0 && step_through_delay
)
2866 /* The user issued a continue when stopped at a breakpoint.
2867 Set up for another trap and get out of here. */
2868 ecs
->event_thread
->stepping_over_breakpoint
= 1;
2872 else if (step_through_delay
)
2874 /* The user issued a step when stopped at a breakpoint.
2875 Maybe we should stop, maybe we should not - the delay
2876 slot *might* correspond to a line of source. In any
2877 case, don't decide that here, just set
2878 ecs->stepping_over_breakpoint, making sure we
2879 single-step again before breakpoints are re-inserted. */
2880 ecs
->event_thread
->stepping_over_breakpoint
= 1;
2884 /* Look at the cause of the stop, and decide what to do.
2885 The alternatives are:
2886 1) stop_stepping and return; to really stop and return to the debugger,
2887 2) keep_going and return to start up again
2888 (set ecs->event_thread->stepping_over_breakpoint to 1 to single step once)
2889 3) set ecs->random_signal to 1, and the decision between 1 and 2
2890 will be made according to the signal handling tables. */
2892 /* First, distinguish signals caused by the debugger from signals
2893 that have to do with the program's own actions. Note that
2894 breakpoint insns may cause SIGTRAP or SIGILL or SIGEMT, depending
2895 on the operating system version. Here we detect when a SIGILL or
2896 SIGEMT is really a breakpoint and change it to SIGTRAP. We do
2897 something similar for SIGSEGV, since a SIGSEGV will be generated
2898 when we're trying to execute a breakpoint instruction on a
2899 non-executable stack. This happens for call dummy breakpoints
2900 for architectures like SPARC that place call dummies on the
2903 If we're doing a displaced step past a breakpoint, then the
2904 breakpoint is always inserted at the original instruction;
2905 non-standard signals can't be explained by the breakpoint. */
2906 if (ecs
->event_thread
->stop_signal
== TARGET_SIGNAL_TRAP
2907 || (! ecs
->event_thread
->trap_expected
2908 && breakpoint_inserted_here_p (stop_pc
)
2909 && (ecs
->event_thread
->stop_signal
== TARGET_SIGNAL_ILL
2910 || ecs
->event_thread
->stop_signal
== TARGET_SIGNAL_SEGV
2911 || ecs
->event_thread
->stop_signal
== TARGET_SIGNAL_EMT
))
2912 || stop_soon
== STOP_QUIETLY
|| stop_soon
== STOP_QUIETLY_NO_SIGSTOP
2913 || stop_soon
== STOP_QUIETLY_REMOTE
)
2915 if (ecs
->event_thread
->stop_signal
== TARGET_SIGNAL_TRAP
&& stop_after_trap
)
2918 fprintf_unfiltered (gdb_stdlog
, "infrun: stopped\n");
2919 stop_print_frame
= 0;
2920 stop_stepping (ecs
);
2924 /* This is originated from start_remote(), start_inferior() and
2925 shared libraries hook functions. */
2926 if (stop_soon
== STOP_QUIETLY
|| stop_soon
== STOP_QUIETLY_REMOTE
)
2929 fprintf_unfiltered (gdb_stdlog
, "infrun: quietly stopped\n");
2930 stop_stepping (ecs
);
2934 /* This originates from attach_command(). We need to overwrite
2935 the stop_signal here, because some kernels don't ignore a
2936 SIGSTOP in a subsequent ptrace(PTRACE_CONT,SIGSTOP) call.
2937 See more comments in inferior.h. On the other hand, if we
2938 get a non-SIGSTOP, report it to the user - assume the backend
2939 will handle the SIGSTOP if it should show up later.
2941 Also consider that the attach is complete when we see a
2942 SIGTRAP. Some systems (e.g. Windows), and stubs supporting
2943 target extended-remote report it instead of a SIGSTOP
2944 (e.g. gdbserver). We already rely on SIGTRAP being our
2945 signal, so this is no exception.
2947 Also consider that the attach is complete when we see a
2948 TARGET_SIGNAL_0. In non-stop mode, GDB will explicitly tell
2949 the target to stop all threads of the inferior, in case the
2950 low level attach operation doesn't stop them implicitly. If
2951 they weren't stopped implicitly, then the stub will report a
2952 TARGET_SIGNAL_0, meaning: stopped for no particular reason
2953 other than GDB's request. */
2954 if (stop_soon
== STOP_QUIETLY_NO_SIGSTOP
2955 && (ecs
->event_thread
->stop_signal
== TARGET_SIGNAL_STOP
2956 || ecs
->event_thread
->stop_signal
== TARGET_SIGNAL_TRAP
2957 || ecs
->event_thread
->stop_signal
== TARGET_SIGNAL_0
))
2959 stop_stepping (ecs
);
2960 ecs
->event_thread
->stop_signal
= TARGET_SIGNAL_0
;
2964 /* See if there is a breakpoint at the current PC. */
2965 ecs
->event_thread
->stop_bpstat
= bpstat_stop_status (stop_pc
, ecs
->ptid
);
2967 /* Following in case break condition called a
2969 stop_print_frame
= 1;
2971 /* NOTE: cagney/2003-03-29: These two checks for a random signal
2972 at one stage in the past included checks for an inferior
2973 function call's call dummy's return breakpoint. The original
2974 comment, that went with the test, read:
2976 ``End of a stack dummy. Some systems (e.g. Sony news) give
2977 another signal besides SIGTRAP, so check here as well as
2980 If someone ever tries to get call dummys on a
2981 non-executable stack to work (where the target would stop
2982 with something like a SIGSEGV), then those tests might need
2983 to be re-instated. Given, however, that the tests were only
2984 enabled when momentary breakpoints were not being used, I
2985 suspect that it won't be the case.
2987 NOTE: kettenis/2004-02-05: Indeed such checks don't seem to
2988 be necessary for call dummies on a non-executable stack on
2991 if (ecs
->event_thread
->stop_signal
== TARGET_SIGNAL_TRAP
)
2993 = !(bpstat_explains_signal (ecs
->event_thread
->stop_bpstat
)
2994 || ecs
->event_thread
->trap_expected
2995 || (ecs
->event_thread
->step_range_end
2996 && ecs
->event_thread
->step_resume_breakpoint
== NULL
));
2999 ecs
->random_signal
= !bpstat_explains_signal (ecs
->event_thread
->stop_bpstat
);
3000 if (!ecs
->random_signal
)
3001 ecs
->event_thread
->stop_signal
= TARGET_SIGNAL_TRAP
;
3005 /* When we reach this point, we've pretty much decided
3006 that the reason for stopping must've been a random
3007 (unexpected) signal. */
3010 ecs
->random_signal
= 1;
3012 process_event_stop_test
:
3013 /* For the program's own signals, act according to
3014 the signal handling tables. */
3016 if (ecs
->random_signal
)
3018 /* Signal not for debugging purposes. */
3022 fprintf_unfiltered (gdb_stdlog
, "infrun: random signal %d\n",
3023 ecs
->event_thread
->stop_signal
);
3025 stopped_by_random_signal
= 1;
3027 if (signal_print
[ecs
->event_thread
->stop_signal
])
3030 target_terminal_ours_for_output ();
3031 print_stop_reason (SIGNAL_RECEIVED
, ecs
->event_thread
->stop_signal
);
3033 /* Always stop on signals if we're either just gaining control
3034 of the program, or the user explicitly requested this thread
3035 to remain stopped. */
3036 if (stop_soon
!= NO_STOP_QUIETLY
3037 || ecs
->event_thread
->stop_requested
3038 || signal_stop_state (ecs
->event_thread
->stop_signal
))
3040 stop_stepping (ecs
);
3043 /* If not going to stop, give terminal back
3044 if we took it away. */
3046 target_terminal_inferior ();
3048 /* Clear the signal if it should not be passed. */
3049 if (signal_program
[ecs
->event_thread
->stop_signal
] == 0)
3050 ecs
->event_thread
->stop_signal
= TARGET_SIGNAL_0
;
3052 if (ecs
->event_thread
->prev_pc
== read_pc ()
3053 && ecs
->event_thread
->trap_expected
3054 && ecs
->event_thread
->step_resume_breakpoint
== NULL
)
3056 /* We were just starting a new sequence, attempting to
3057 single-step off of a breakpoint and expecting a SIGTRAP.
3058 Instead this signal arrives. This signal will take us out
3059 of the stepping range so GDB needs to remember to, when
3060 the signal handler returns, resume stepping off that
3062 /* To simplify things, "continue" is forced to use the same
3063 code paths as single-step - set a breakpoint at the
3064 signal return address and then, once hit, step off that
3067 fprintf_unfiltered (gdb_stdlog
,
3068 "infrun: signal arrived while stepping over "
3071 insert_step_resume_breakpoint_at_frame (get_current_frame ());
3072 ecs
->event_thread
->step_after_step_resume_breakpoint
= 1;
3077 if (ecs
->event_thread
->step_range_end
!= 0
3078 && ecs
->event_thread
->stop_signal
!= TARGET_SIGNAL_0
3079 && (ecs
->event_thread
->step_range_start
<= stop_pc
3080 && stop_pc
< ecs
->event_thread
->step_range_end
)
3081 && frame_id_eq (get_frame_id (get_current_frame ()),
3082 ecs
->event_thread
->step_frame_id
)
3083 && ecs
->event_thread
->step_resume_breakpoint
== NULL
)
3085 /* The inferior is about to take a signal that will take it
3086 out of the single step range. Set a breakpoint at the
3087 current PC (which is presumably where the signal handler
3088 will eventually return) and then allow the inferior to
3091 Note that this is only needed for a signal delivered
3092 while in the single-step range. Nested signals aren't a
3093 problem as they eventually all return. */
3095 fprintf_unfiltered (gdb_stdlog
,
3096 "infrun: signal may take us out of "
3097 "single-step range\n");
3099 insert_step_resume_breakpoint_at_frame (get_current_frame ());
3104 /* Note: step_resume_breakpoint may be non-NULL. This occures
3105 when either there's a nested signal, or when there's a
3106 pending signal enabled just as the signal handler returns
3107 (leaving the inferior at the step-resume-breakpoint without
3108 actually executing it). Either way continue until the
3109 breakpoint is really hit. */
3114 /* Handle cases caused by hitting a breakpoint. */
3116 CORE_ADDR jmp_buf_pc
;
3117 struct bpstat_what what
;
3119 what
= bpstat_what (ecs
->event_thread
->stop_bpstat
);
3121 if (what
.call_dummy
)
3123 stop_stack_dummy
= 1;
3126 switch (what
.main_action
)
3128 case BPSTAT_WHAT_SET_LONGJMP_RESUME
:
3129 /* If we hit the breakpoint at longjmp while stepping, we
3130 install a momentary breakpoint at the target of the
3134 fprintf_unfiltered (gdb_stdlog
,
3135 "infrun: BPSTAT_WHAT_SET_LONGJMP_RESUME\n");
3137 ecs
->event_thread
->stepping_over_breakpoint
= 1;
3139 if (!gdbarch_get_longjmp_target_p (current_gdbarch
)
3140 || !gdbarch_get_longjmp_target (current_gdbarch
,
3141 get_current_frame (), &jmp_buf_pc
))
3144 fprintf_unfiltered (gdb_stdlog
, "\
3145 infrun: BPSTAT_WHAT_SET_LONGJMP_RESUME (!gdbarch_get_longjmp_target)\n");
3150 /* We're going to replace the current step-resume breakpoint
3151 with a longjmp-resume breakpoint. */
3152 delete_step_resume_breakpoint (ecs
->event_thread
);
3154 /* Insert a breakpoint at resume address. */
3155 insert_longjmp_resume_breakpoint (jmp_buf_pc
);
3160 case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME
:
3162 fprintf_unfiltered (gdb_stdlog
,
3163 "infrun: BPSTAT_WHAT_CLEAR_LONGJMP_RESUME\n");
3165 gdb_assert (ecs
->event_thread
->step_resume_breakpoint
!= NULL
);
3166 delete_step_resume_breakpoint (ecs
->event_thread
);
3168 ecs
->event_thread
->stop_step
= 1;
3169 print_stop_reason (END_STEPPING_RANGE
, 0);
3170 stop_stepping (ecs
);
3173 case BPSTAT_WHAT_SINGLE
:
3175 fprintf_unfiltered (gdb_stdlog
, "infrun: BPSTAT_WHAT_SINGLE\n");
3176 ecs
->event_thread
->stepping_over_breakpoint
= 1;
3177 /* Still need to check other stuff, at least the case
3178 where we are stepping and step out of the right range. */
3181 case BPSTAT_WHAT_STOP_NOISY
:
3183 fprintf_unfiltered (gdb_stdlog
, "infrun: BPSTAT_WHAT_STOP_NOISY\n");
3184 stop_print_frame
= 1;
3186 /* We are about to nuke the step_resume_breakpointt via the
3187 cleanup chain, so no need to worry about it here. */
3189 stop_stepping (ecs
);
3192 case BPSTAT_WHAT_STOP_SILENT
:
3194 fprintf_unfiltered (gdb_stdlog
, "infrun: BPSTAT_WHAT_STOP_SILENT\n");
3195 stop_print_frame
= 0;
3197 /* We are about to nuke the step_resume_breakpoin via the
3198 cleanup chain, so no need to worry about it here. */
3200 stop_stepping (ecs
);
3203 case BPSTAT_WHAT_STEP_RESUME
:
3205 fprintf_unfiltered (gdb_stdlog
, "infrun: BPSTAT_WHAT_STEP_RESUME\n");
3207 delete_step_resume_breakpoint (ecs
->event_thread
);
3208 if (ecs
->event_thread
->step_after_step_resume_breakpoint
)
3210 /* Back when the step-resume breakpoint was inserted, we
3211 were trying to single-step off a breakpoint. Go back
3213 ecs
->event_thread
->step_after_step_resume_breakpoint
= 0;
3214 ecs
->event_thread
->stepping_over_breakpoint
= 1;
3218 if (stop_pc
== ecs
->stop_func_start
3219 && execution_direction
== EXEC_REVERSE
)
3221 /* We are stepping over a function call in reverse, and
3222 just hit the step-resume breakpoint at the start
3223 address of the function. Go back to single-stepping,
3224 which should take us back to the function call. */
3225 ecs
->event_thread
->stepping_over_breakpoint
= 1;
3231 case BPSTAT_WHAT_CHECK_SHLIBS
:
3234 fprintf_unfiltered (gdb_stdlog
, "infrun: BPSTAT_WHAT_CHECK_SHLIBS\n");
3236 /* Check for any newly added shared libraries if we're
3237 supposed to be adding them automatically. Switch
3238 terminal for any messages produced by
3239 breakpoint_re_set. */
3240 target_terminal_ours_for_output ();
3241 /* NOTE: cagney/2003-11-25: Make certain that the target
3242 stack's section table is kept up-to-date. Architectures,
3243 (e.g., PPC64), use the section table to perform
3244 operations such as address => section name and hence
3245 require the table to contain all sections (including
3246 those found in shared libraries). */
3247 /* NOTE: cagney/2003-11-25: Pass current_target and not
3248 exec_ops to SOLIB_ADD. This is because current GDB is
3249 only tooled to propagate section_table changes out from
3250 the "current_target" (see target_resize_to_sections), and
3251 not up from the exec stratum. This, of course, isn't
3252 right. "infrun.c" should only interact with the
3253 exec/process stratum, instead relying on the target stack
3254 to propagate relevant changes (stop, section table
3255 changed, ...) up to other layers. */
3257 SOLIB_ADD (NULL
, 0, ¤t_target
, auto_solib_add
);
3259 solib_add (NULL
, 0, ¤t_target
, auto_solib_add
);
3261 target_terminal_inferior ();
3263 /* If requested, stop when the dynamic linker notifies
3264 gdb of events. This allows the user to get control
3265 and place breakpoints in initializer routines for
3266 dynamically loaded objects (among other things). */
3267 if (stop_on_solib_events
|| stop_stack_dummy
)
3269 stop_stepping (ecs
);
3274 /* We want to step over this breakpoint, then keep going. */
3275 ecs
->event_thread
->stepping_over_breakpoint
= 1;
3281 case BPSTAT_WHAT_LAST
:
3282 /* Not a real code, but listed here to shut up gcc -Wall. */
3284 case BPSTAT_WHAT_KEEP_CHECKING
:
3289 /* We come here if we hit a breakpoint but should not
3290 stop for it. Possibly we also were stepping
3291 and should stop for that. So fall through and
3292 test for stepping. But, if not stepping,
3295 /* In all-stop mode, if we're currently stepping but have stopped in
3296 some other thread, we need to switch back to the stepped thread. */
3299 struct thread_info
*tp
;
3300 tp
= iterate_over_threads (currently_stepping_callback
,
3304 /* However, if the current thread is blocked on some internal
3305 breakpoint, and we simply need to step over that breakpoint
3306 to get it going again, do that first. */
3307 if ((ecs
->event_thread
->trap_expected
3308 && ecs
->event_thread
->stop_signal
!= TARGET_SIGNAL_TRAP
)
3309 || ecs
->event_thread
->stepping_over_breakpoint
)
3315 /* Otherwise, we no longer expect a trap in the current thread.
3316 Clear the trap_expected flag before switching back -- this is
3317 what keep_going would do as well, if we called it. */
3318 ecs
->event_thread
->trap_expected
= 0;
3321 fprintf_unfiltered (gdb_stdlog
,
3322 "infrun: switching back to stepped thread\n");
3324 ecs
->event_thread
= tp
;
3325 ecs
->ptid
= tp
->ptid
;
3326 context_switch (ecs
->ptid
);
3332 /* Are we stepping to get the inferior out of the dynamic linker's
3333 hook (and possibly the dld itself) after catching a shlib
3335 if (ecs
->event_thread
->stepping_through_solib_after_catch
)
3337 #if defined(SOLIB_ADD)
3338 /* Have we reached our destination? If not, keep going. */
3339 if (SOLIB_IN_DYNAMIC_LINKER (PIDGET (ecs
->ptid
), stop_pc
))
3342 fprintf_unfiltered (gdb_stdlog
, "infrun: stepping in dynamic linker\n");
3343 ecs
->event_thread
->stepping_over_breakpoint
= 1;
3349 fprintf_unfiltered (gdb_stdlog
, "infrun: step past dynamic linker\n");
3350 /* Else, stop and report the catchpoint(s) whose triggering
3351 caused us to begin stepping. */
3352 ecs
->event_thread
->stepping_through_solib_after_catch
= 0;
3353 bpstat_clear (&ecs
->event_thread
->stop_bpstat
);
3354 ecs
->event_thread
->stop_bpstat
3355 = bpstat_copy (ecs
->event_thread
->stepping_through_solib_catchpoints
);
3356 bpstat_clear (&ecs
->event_thread
->stepping_through_solib_catchpoints
);
3357 stop_print_frame
= 1;
3358 stop_stepping (ecs
);
3362 if (ecs
->event_thread
->step_resume_breakpoint
)
3365 fprintf_unfiltered (gdb_stdlog
,
3366 "infrun: step-resume breakpoint is inserted\n");
3368 /* Having a step-resume breakpoint overrides anything
3369 else having to do with stepping commands until
3370 that breakpoint is reached. */
3375 if (ecs
->event_thread
->step_range_end
== 0)
3378 fprintf_unfiltered (gdb_stdlog
, "infrun: no stepping, continue\n");
3379 /* Likewise if we aren't even stepping. */
3384 /* If stepping through a line, keep going if still within it.
3386 Note that step_range_end is the address of the first instruction
3387 beyond the step range, and NOT the address of the last instruction
3389 if (stop_pc
>= ecs
->event_thread
->step_range_start
3390 && stop_pc
< ecs
->event_thread
->step_range_end
)
3393 fprintf_unfiltered (gdb_stdlog
, "infrun: stepping inside range [0x%s-0x%s]\n",
3394 paddr_nz (ecs
->event_thread
->step_range_start
),
3395 paddr_nz (ecs
->event_thread
->step_range_end
));
3397 /* When stepping backward, stop at beginning of line range
3398 (unless it's the function entry point, in which case
3399 keep going back to the call point). */
3400 if (stop_pc
== ecs
->event_thread
->step_range_start
3401 && stop_pc
!= ecs
->stop_func_start
3402 && execution_direction
== EXEC_REVERSE
)
3404 ecs
->event_thread
->stop_step
= 1;
3405 print_stop_reason (END_STEPPING_RANGE
, 0);
3406 stop_stepping (ecs
);
3414 /* We stepped out of the stepping range. */
3416 /* If we are stepping at the source level and entered the runtime
3417 loader dynamic symbol resolution code, we keep on single stepping
3418 until we exit the run time loader code and reach the callee's
3420 if (ecs
->event_thread
->step_over_calls
== STEP_OVER_UNDEBUGGABLE
3421 && in_solib_dynsym_resolve_code (stop_pc
))
3423 CORE_ADDR pc_after_resolver
=
3424 gdbarch_skip_solib_resolver (current_gdbarch
, stop_pc
);
3427 fprintf_unfiltered (gdb_stdlog
, "infrun: stepped into dynsym resolve code\n");
3429 if (pc_after_resolver
)
3431 /* Set up a step-resume breakpoint at the address
3432 indicated by SKIP_SOLIB_RESOLVER. */
3433 struct symtab_and_line sr_sal
;
3435 sr_sal
.pc
= pc_after_resolver
;
3437 insert_step_resume_breakpoint_at_sal (sr_sal
, null_frame_id
);
3444 if (ecs
->event_thread
->step_range_end
!= 1
3445 && (ecs
->event_thread
->step_over_calls
== STEP_OVER_UNDEBUGGABLE
3446 || ecs
->event_thread
->step_over_calls
== STEP_OVER_ALL
)
3447 && get_frame_type (get_current_frame ()) == SIGTRAMP_FRAME
)
3450 fprintf_unfiltered (gdb_stdlog
, "infrun: stepped into signal trampoline\n");
3451 /* The inferior, while doing a "step" or "next", has ended up in
3452 a signal trampoline (either by a signal being delivered or by
3453 the signal handler returning). Just single-step until the
3454 inferior leaves the trampoline (either by calling the handler
3460 /* Check for subroutine calls. The check for the current frame
3461 equalling the step ID is not necessary - the check of the
3462 previous frame's ID is sufficient - but it is a common case and
3463 cheaper than checking the previous frame's ID.
3465 NOTE: frame_id_eq will never report two invalid frame IDs as
3466 being equal, so to get into this block, both the current and
3467 previous frame must have valid frame IDs. */
3468 if (!frame_id_eq (get_frame_id (get_current_frame ()),
3469 ecs
->event_thread
->step_frame_id
)
3470 && (frame_id_eq (frame_unwind_id (get_current_frame ()),
3471 ecs
->event_thread
->step_frame_id
)
3472 || execution_direction
== EXEC_REVERSE
))
3474 CORE_ADDR real_stop_pc
;
3477 fprintf_unfiltered (gdb_stdlog
, "infrun: stepped into subroutine\n");
3479 if ((ecs
->event_thread
->step_over_calls
== STEP_OVER_NONE
)
3480 || ((ecs
->event_thread
->step_range_end
== 1)
3481 && in_prologue (ecs
->event_thread
->prev_pc
,
3482 ecs
->stop_func_start
)))
3484 /* I presume that step_over_calls is only 0 when we're
3485 supposed to be stepping at the assembly language level
3486 ("stepi"). Just stop. */
3487 /* Also, maybe we just did a "nexti" inside a prolog, so we
3488 thought it was a subroutine call but it was not. Stop as
3490 ecs
->event_thread
->stop_step
= 1;
3491 print_stop_reason (END_STEPPING_RANGE
, 0);
3492 stop_stepping (ecs
);
3496 if (ecs
->event_thread
->step_over_calls
== STEP_OVER_ALL
)
3498 /* We're doing a "next".
3500 Normal (forward) execution: set a breakpoint at the
3501 callee's return address (the address at which the caller
3504 Reverse (backward) execution. set the step-resume
3505 breakpoint at the start of the function that we just
3506 stepped into (backwards), and continue to there. When we
3507 get there, we'll need to single-step back to the caller. */
3509 if (execution_direction
== EXEC_REVERSE
)
3511 struct symtab_and_line sr_sal
;
3513 if (ecs
->stop_func_start
== 0
3514 && in_solib_dynsym_resolve_code (stop_pc
))
3516 /* Stepped into runtime loader dynamic symbol
3517 resolution code. Since we're in reverse,
3518 we have already backed up through the runtime
3519 loader and the dynamic function. This is just
3520 the trampoline (jump table).
3522 Just keep stepping, we'll soon be home.
3527 /* Normal (staticly linked) function call return. */
3529 sr_sal
.pc
= ecs
->stop_func_start
;
3530 insert_step_resume_breakpoint_at_sal (sr_sal
, null_frame_id
);
3533 insert_step_resume_breakpoint_at_caller (get_current_frame ());
3539 /* If we are in a function call trampoline (a stub between the
3540 calling routine and the real function), locate the real
3541 function. That's what tells us (a) whether we want to step
3542 into it at all, and (b) what prologue we want to run to the
3543 end of, if we do step into it. */
3544 real_stop_pc
= skip_language_trampoline (get_current_frame (), stop_pc
);
3545 if (real_stop_pc
== 0)
3546 real_stop_pc
= gdbarch_skip_trampoline_code
3547 (current_gdbarch
, get_current_frame (), stop_pc
);
3548 if (real_stop_pc
!= 0)
3549 ecs
->stop_func_start
= real_stop_pc
;
3551 if (real_stop_pc
!= 0 && in_solib_dynsym_resolve_code (real_stop_pc
))
3553 struct symtab_and_line sr_sal
;
3555 sr_sal
.pc
= ecs
->stop_func_start
;
3557 insert_step_resume_breakpoint_at_sal (sr_sal
, null_frame_id
);
3562 /* If we have line number information for the function we are
3563 thinking of stepping into, step into it.
3565 If there are several symtabs at that PC (e.g. with include
3566 files), just want to know whether *any* of them have line
3567 numbers. find_pc_line handles this. */
3569 struct symtab_and_line tmp_sal
;
3571 tmp_sal
= find_pc_line (ecs
->stop_func_start
, 0);
3572 if (tmp_sal
.line
!= 0)
3574 if (execution_direction
== EXEC_REVERSE
)
3575 handle_step_into_function_backward (ecs
);
3577 handle_step_into_function (ecs
);
3582 /* If we have no line number and the step-stop-if-no-debug is
3583 set, we stop the step so that the user has a chance to switch
3584 in assembly mode. */
3585 if (ecs
->event_thread
->step_over_calls
== STEP_OVER_UNDEBUGGABLE
3586 && step_stop_if_no_debug
)
3588 ecs
->event_thread
->stop_step
= 1;
3589 print_stop_reason (END_STEPPING_RANGE
, 0);
3590 stop_stepping (ecs
);
3594 if (execution_direction
== EXEC_REVERSE
)
3596 /* Set a breakpoint at callee's start address.
3597 From there we can step once and be back in the caller. */
3598 struct symtab_and_line sr_sal
;
3600 sr_sal
.pc
= ecs
->stop_func_start
;
3601 insert_step_resume_breakpoint_at_sal (sr_sal
, null_frame_id
);
3604 /* Set a breakpoint at callee's return address (the address
3605 at which the caller will resume). */
3606 insert_step_resume_breakpoint_at_caller (get_current_frame ());
3612 /* If we're in the return path from a shared library trampoline,
3613 we want to proceed through the trampoline when stepping. */
3614 if (gdbarch_in_solib_return_trampoline (current_gdbarch
,
3615 stop_pc
, ecs
->stop_func_name
))
3617 /* Determine where this trampoline returns. */
3618 CORE_ADDR real_stop_pc
;
3619 real_stop_pc
= gdbarch_skip_trampoline_code
3620 (current_gdbarch
, get_current_frame (), stop_pc
);
3623 fprintf_unfiltered (gdb_stdlog
, "infrun: stepped into solib return tramp\n");
3625 /* Only proceed through if we know where it's going. */
3628 /* And put the step-breakpoint there and go until there. */
3629 struct symtab_and_line sr_sal
;
3631 init_sal (&sr_sal
); /* initialize to zeroes */
3632 sr_sal
.pc
= real_stop_pc
;
3633 sr_sal
.section
= find_pc_overlay (sr_sal
.pc
);
3635 /* Do not specify what the fp should be when we stop since
3636 on some machines the prologue is where the new fp value
3638 insert_step_resume_breakpoint_at_sal (sr_sal
, null_frame_id
);
3640 /* Restart without fiddling with the step ranges or
3647 stop_pc_sal
= find_pc_line (stop_pc
, 0);
3649 /* NOTE: tausq/2004-05-24: This if block used to be done before all
3650 the trampoline processing logic, however, there are some trampolines
3651 that have no names, so we should do trampoline handling first. */
3652 if (ecs
->event_thread
->step_over_calls
== STEP_OVER_UNDEBUGGABLE
3653 && ecs
->stop_func_name
== NULL
3654 && stop_pc_sal
.line
== 0)
3657 fprintf_unfiltered (gdb_stdlog
, "infrun: stepped into undebuggable function\n");
3659 /* The inferior just stepped into, or returned to, an
3660 undebuggable function (where there is no debugging information
3661 and no line number corresponding to the address where the
3662 inferior stopped). Since we want to skip this kind of code,
3663 we keep going until the inferior returns from this
3664 function - unless the user has asked us not to (via
3665 set step-mode) or we no longer know how to get back
3666 to the call site. */
3667 if (step_stop_if_no_debug
3668 || !frame_id_p (frame_unwind_id (get_current_frame ())))
3670 /* If we have no line number and the step-stop-if-no-debug
3671 is set, we stop the step so that the user has a chance to
3672 switch in assembly mode. */
3673 ecs
->event_thread
->stop_step
= 1;
3674 print_stop_reason (END_STEPPING_RANGE
, 0);
3675 stop_stepping (ecs
);
3680 /* Set a breakpoint at callee's return address (the address
3681 at which the caller will resume). */
3682 insert_step_resume_breakpoint_at_caller (get_current_frame ());
3688 if (ecs
->event_thread
->step_range_end
== 1)
3690 /* It is stepi or nexti. We always want to stop stepping after
3693 fprintf_unfiltered (gdb_stdlog
, "infrun: stepi/nexti\n");
3694 ecs
->event_thread
->stop_step
= 1;
3695 print_stop_reason (END_STEPPING_RANGE
, 0);
3696 stop_stepping (ecs
);
3700 if (stop_pc_sal
.line
== 0)
3702 /* We have no line number information. That means to stop
3703 stepping (does this always happen right after one instruction,
3704 when we do "s" in a function with no line numbers,
3705 or can this happen as a result of a return or longjmp?). */
3707 fprintf_unfiltered (gdb_stdlog
, "infrun: no line number info\n");
3708 ecs
->event_thread
->stop_step
= 1;
3709 print_stop_reason (END_STEPPING_RANGE
, 0);
3710 stop_stepping (ecs
);
3714 if ((stop_pc
== stop_pc_sal
.pc
)
3715 && (ecs
->event_thread
->current_line
!= stop_pc_sal
.line
3716 || ecs
->event_thread
->current_symtab
!= stop_pc_sal
.symtab
))
3718 /* We are at the start of a different line. So stop. Note that
3719 we don't stop if we step into the middle of a different line.
3720 That is said to make things like for (;;) statements work
3723 fprintf_unfiltered (gdb_stdlog
, "infrun: stepped to a different line\n");
3724 ecs
->event_thread
->stop_step
= 1;
3725 print_stop_reason (END_STEPPING_RANGE
, 0);
3726 stop_stepping (ecs
);
3730 /* We aren't done stepping.
3732 Optimize by setting the stepping range to the line.
3733 (We might not be in the original line, but if we entered a
3734 new line in mid-statement, we continue stepping. This makes
3735 things like for(;;) statements work better.) */
3737 ecs
->event_thread
->step_range_start
= stop_pc_sal
.pc
;
3738 ecs
->event_thread
->step_range_end
= stop_pc_sal
.end
;
3739 ecs
->event_thread
->step_frame_id
= get_frame_id (get_current_frame ());
3740 ecs
->event_thread
->current_line
= stop_pc_sal
.line
;
3741 ecs
->event_thread
->current_symtab
= stop_pc_sal
.symtab
;
3744 fprintf_unfiltered (gdb_stdlog
, "infrun: keep going\n");
3748 /* Are we in the middle of stepping? */
3751 currently_stepping_thread (struct thread_info
*tp
)
3753 return (tp
->step_range_end
&& tp
->step_resume_breakpoint
== NULL
)
3754 || tp
->trap_expected
3755 || tp
->stepping_through_solib_after_catch
;
3759 currently_stepping_callback (struct thread_info
*tp
, void *data
)
3761 /* Return true if any thread *but* the one passed in "data" is
3762 in the middle of stepping. */
3763 return tp
!= data
&& currently_stepping_thread (tp
);
3767 currently_stepping (struct thread_info
*tp
)
3769 return currently_stepping_thread (tp
) || bpstat_should_step ();
3772 /* Inferior has stepped into a subroutine call with source code that
3773 we should not step over. Do step to the first line of code in
3777 handle_step_into_function (struct execution_control_state
*ecs
)
3780 struct symtab_and_line stop_func_sal
, sr_sal
;
3782 s
= find_pc_symtab (stop_pc
);
3783 if (s
&& s
->language
!= language_asm
)
3784 ecs
->stop_func_start
= gdbarch_skip_prologue (current_gdbarch
,
3785 ecs
->stop_func_start
);
3787 stop_func_sal
= find_pc_line (ecs
->stop_func_start
, 0);
3788 /* Use the step_resume_break to step until the end of the prologue,
3789 even if that involves jumps (as it seems to on the vax under
3791 /* If the prologue ends in the middle of a source line, continue to
3792 the end of that source line (if it is still within the function).
3793 Otherwise, just go to end of prologue. */
3794 if (stop_func_sal
.end
3795 && stop_func_sal
.pc
!= ecs
->stop_func_start
3796 && stop_func_sal
.end
< ecs
->stop_func_end
)
3797 ecs
->stop_func_start
= stop_func_sal
.end
;
3799 /* Architectures which require breakpoint adjustment might not be able
3800 to place a breakpoint at the computed address. If so, the test
3801 ``ecs->stop_func_start == stop_pc'' will never succeed. Adjust
3802 ecs->stop_func_start to an address at which a breakpoint may be
3803 legitimately placed.
3805 Note: kevinb/2004-01-19: On FR-V, if this adjustment is not
3806 made, GDB will enter an infinite loop when stepping through
3807 optimized code consisting of VLIW instructions which contain
3808 subinstructions corresponding to different source lines. On
3809 FR-V, it's not permitted to place a breakpoint on any but the
3810 first subinstruction of a VLIW instruction. When a breakpoint is
3811 set, GDB will adjust the breakpoint address to the beginning of
3812 the VLIW instruction. Thus, we need to make the corresponding
3813 adjustment here when computing the stop address. */
3815 if (gdbarch_adjust_breakpoint_address_p (current_gdbarch
))
3817 ecs
->stop_func_start
3818 = gdbarch_adjust_breakpoint_address (current_gdbarch
,
3819 ecs
->stop_func_start
);
3822 if (ecs
->stop_func_start
== stop_pc
)
3824 /* We are already there: stop now. */
3825 ecs
->event_thread
->stop_step
= 1;
3826 print_stop_reason (END_STEPPING_RANGE
, 0);
3827 stop_stepping (ecs
);
3832 /* Put the step-breakpoint there and go until there. */
3833 init_sal (&sr_sal
); /* initialize to zeroes */
3834 sr_sal
.pc
= ecs
->stop_func_start
;
3835 sr_sal
.section
= find_pc_overlay (ecs
->stop_func_start
);
3837 /* Do not specify what the fp should be when we stop since on
3838 some machines the prologue is where the new fp value is
3840 insert_step_resume_breakpoint_at_sal (sr_sal
, null_frame_id
);
3842 /* And make sure stepping stops right away then. */
3843 ecs
->event_thread
->step_range_end
= ecs
->event_thread
->step_range_start
;
3848 /* Inferior has stepped backward into a subroutine call with source
3849 code that we should not step over. Do step to the beginning of the
3850 last line of code in it. */
3853 handle_step_into_function_backward (struct execution_control_state
*ecs
)
3856 struct symtab_and_line stop_func_sal
, sr_sal
;
3858 s
= find_pc_symtab (stop_pc
);
3859 if (s
&& s
->language
!= language_asm
)
3860 ecs
->stop_func_start
= gdbarch_skip_prologue (current_gdbarch
,
3861 ecs
->stop_func_start
);
3863 stop_func_sal
= find_pc_line (stop_pc
, 0);
3865 /* OK, we're just going to keep stepping here. */
3866 if (stop_func_sal
.pc
== stop_pc
)
3868 /* We're there already. Just stop stepping now. */
3869 ecs
->event_thread
->stop_step
= 1;
3870 print_stop_reason (END_STEPPING_RANGE
, 0);
3871 stop_stepping (ecs
);
3875 /* Else just reset the step range and keep going.
3876 No step-resume breakpoint, they don't work for
3877 epilogues, which can have multiple entry paths. */
3878 ecs
->event_thread
->step_range_start
= stop_func_sal
.pc
;
3879 ecs
->event_thread
->step_range_end
= stop_func_sal
.end
;
3885 /* Insert a "step-resume breakpoint" at SR_SAL with frame ID SR_ID.
3886 This is used to both functions and to skip over code. */
3889 insert_step_resume_breakpoint_at_sal (struct symtab_and_line sr_sal
,
3890 struct frame_id sr_id
)
3892 /* There should never be more than one step-resume or longjmp-resume
3893 breakpoint per thread, so we should never be setting a new
3894 step_resume_breakpoint when one is already active. */
3895 gdb_assert (inferior_thread ()->step_resume_breakpoint
== NULL
);
3898 fprintf_unfiltered (gdb_stdlog
,
3899 "infrun: inserting step-resume breakpoint at 0x%s\n",
3900 paddr_nz (sr_sal
.pc
));
3902 inferior_thread ()->step_resume_breakpoint
3903 = set_momentary_breakpoint (sr_sal
, sr_id
, bp_step_resume
);
3906 /* Insert a "step-resume breakpoint" at RETURN_FRAME.pc. This is used
3907 to skip a potential signal handler.
3909 This is called with the interrupted function's frame. The signal
3910 handler, when it returns, will resume the interrupted function at
3914 insert_step_resume_breakpoint_at_frame (struct frame_info
*return_frame
)
3916 struct symtab_and_line sr_sal
;
3918 gdb_assert (return_frame
!= NULL
);
3919 init_sal (&sr_sal
); /* initialize to zeros */
3921 sr_sal
.pc
= gdbarch_addr_bits_remove
3922 (current_gdbarch
, get_frame_pc (return_frame
));
3923 sr_sal
.section
= find_pc_overlay (sr_sal
.pc
);
3925 insert_step_resume_breakpoint_at_sal (sr_sal
, get_frame_id (return_frame
));
3928 /* Similar to insert_step_resume_breakpoint_at_frame, except
3929 but a breakpoint at the previous frame's PC. This is used to
3930 skip a function after stepping into it (for "next" or if the called
3931 function has no debugging information).
3933 The current function has almost always been reached by single
3934 stepping a call or return instruction. NEXT_FRAME belongs to the
3935 current function, and the breakpoint will be set at the caller's
3938 This is a separate function rather than reusing
3939 insert_step_resume_breakpoint_at_frame in order to avoid
3940 get_prev_frame, which may stop prematurely (see the implementation
3941 of frame_unwind_id for an example). */
3944 insert_step_resume_breakpoint_at_caller (struct frame_info
*next_frame
)
3946 struct symtab_and_line sr_sal
;
3948 /* We shouldn't have gotten here if we don't know where the call site
3950 gdb_assert (frame_id_p (frame_unwind_id (next_frame
)));
3952 init_sal (&sr_sal
); /* initialize to zeros */
3954 sr_sal
.pc
= gdbarch_addr_bits_remove
3955 (current_gdbarch
, frame_pc_unwind (next_frame
));
3956 sr_sal
.section
= find_pc_overlay (sr_sal
.pc
);
3958 insert_step_resume_breakpoint_at_sal (sr_sal
, frame_unwind_id (next_frame
));
3961 /* Insert a "longjmp-resume" breakpoint at PC. This is used to set a
3962 new breakpoint at the target of a jmp_buf. The handling of
3963 longjmp-resume uses the same mechanisms used for handling
3964 "step-resume" breakpoints. */
3967 insert_longjmp_resume_breakpoint (CORE_ADDR pc
)
3969 /* There should never be more than one step-resume or longjmp-resume
3970 breakpoint per thread, so we should never be setting a new
3971 longjmp_resume_breakpoint when one is already active. */
3972 gdb_assert (inferior_thread ()->step_resume_breakpoint
== NULL
);
3975 fprintf_unfiltered (gdb_stdlog
,
3976 "infrun: inserting longjmp-resume breakpoint at 0x%s\n",
3979 inferior_thread ()->step_resume_breakpoint
=
3980 set_momentary_breakpoint_at_pc (pc
, bp_longjmp_resume
);
3984 stop_stepping (struct execution_control_state
*ecs
)
3987 fprintf_unfiltered (gdb_stdlog
, "infrun: stop_stepping\n");
3989 /* Let callers know we don't want to wait for the inferior anymore. */
3990 ecs
->wait_some_more
= 0;
3993 /* This function handles various cases where we need to continue
3994 waiting for the inferior. */
3995 /* (Used to be the keep_going: label in the old wait_for_inferior) */
3998 keep_going (struct execution_control_state
*ecs
)
4000 /* Save the pc before execution, to compare with pc after stop. */
4001 ecs
->event_thread
->prev_pc
= read_pc (); /* Might have been DECR_AFTER_BREAK */
4003 /* If we did not do break;, it means we should keep running the
4004 inferior and not return to debugger. */
4006 if (ecs
->event_thread
->trap_expected
4007 && ecs
->event_thread
->stop_signal
!= TARGET_SIGNAL_TRAP
)
4009 /* We took a signal (which we are supposed to pass through to
4010 the inferior, else we'd not get here) and we haven't yet
4011 gotten our trap. Simply continue. */
4012 resume (currently_stepping (ecs
->event_thread
),
4013 ecs
->event_thread
->stop_signal
);
4017 /* Either the trap was not expected, but we are continuing
4018 anyway (the user asked that this signal be passed to the
4021 The signal was SIGTRAP, e.g. it was our signal, but we
4022 decided we should resume from it.
4024 We're going to run this baby now!
4026 Note that insert_breakpoints won't try to re-insert
4027 already inserted breakpoints. Therefore, we don't
4028 care if breakpoints were already inserted, or not. */
4030 if (ecs
->event_thread
->stepping_over_breakpoint
)
4032 if (! use_displaced_stepping (current_gdbarch
))
4033 /* Since we can't do a displaced step, we have to remove
4034 the breakpoint while we step it. To keep things
4035 simple, we remove them all. */
4036 remove_breakpoints ();
4040 struct gdb_exception e
;
4041 /* Stop stepping when inserting breakpoints
4043 TRY_CATCH (e
, RETURN_MASK_ERROR
)
4045 insert_breakpoints ();
4049 stop_stepping (ecs
);
4054 ecs
->event_thread
->trap_expected
= ecs
->event_thread
->stepping_over_breakpoint
;
4056 /* Do not deliver SIGNAL_TRAP (except when the user explicitly
4057 specifies that such a signal should be delivered to the
4060 Typically, this would occure when a user is debugging a
4061 target monitor on a simulator: the target monitor sets a
4062 breakpoint; the simulator encounters this break-point and
4063 halts the simulation handing control to GDB; GDB, noteing
4064 that the break-point isn't valid, returns control back to the
4065 simulator; the simulator then delivers the hardware
4066 equivalent of a SIGNAL_TRAP to the program being debugged. */
4068 if (ecs
->event_thread
->stop_signal
== TARGET_SIGNAL_TRAP
4069 && !signal_program
[ecs
->event_thread
->stop_signal
])
4070 ecs
->event_thread
->stop_signal
= TARGET_SIGNAL_0
;
4072 resume (currently_stepping (ecs
->event_thread
),
4073 ecs
->event_thread
->stop_signal
);
4076 prepare_to_wait (ecs
);
4079 /* This function normally comes after a resume, before
4080 handle_inferior_event exits. It takes care of any last bits of
4081 housekeeping, and sets the all-important wait_some_more flag. */
4084 prepare_to_wait (struct execution_control_state
*ecs
)
4087 fprintf_unfiltered (gdb_stdlog
, "infrun: prepare_to_wait\n");
4088 if (infwait_state
== infwait_normal_state
)
4090 overlay_cache_invalid
= 1;
4092 /* We have to invalidate the registers BEFORE calling
4093 target_wait because they can be loaded from the target while
4094 in target_wait. This makes remote debugging a bit more
4095 efficient for those targets that provide critical registers
4096 as part of their normal status mechanism. */
4098 registers_changed ();
4099 waiton_ptid
= pid_to_ptid (-1);
4101 /* This is the old end of the while loop. Let everybody know we
4102 want to wait for the inferior some more and get called again
4104 ecs
->wait_some_more
= 1;
4107 /* Print why the inferior has stopped. We always print something when
4108 the inferior exits, or receives a signal. The rest of the cases are
4109 dealt with later on in normal_stop() and print_it_typical(). Ideally
4110 there should be a call to this function from handle_inferior_event()
4111 each time stop_stepping() is called.*/
4113 print_stop_reason (enum inferior_stop_reason stop_reason
, int stop_info
)
4115 switch (stop_reason
)
4117 case END_STEPPING_RANGE
:
4118 /* We are done with a step/next/si/ni command. */
4119 /* For now print nothing. */
4120 /* Print a message only if not in the middle of doing a "step n"
4121 operation for n > 1 */
4122 if (!inferior_thread ()->step_multi
4123 || !inferior_thread ()->stop_step
)
4124 if (ui_out_is_mi_like_p (uiout
))
4127 async_reason_lookup (EXEC_ASYNC_END_STEPPING_RANGE
));
4130 /* The inferior was terminated by a signal. */
4131 annotate_signalled ();
4132 if (ui_out_is_mi_like_p (uiout
))
4135 async_reason_lookup (EXEC_ASYNC_EXITED_SIGNALLED
));
4136 ui_out_text (uiout
, "\nProgram terminated with signal ");
4137 annotate_signal_name ();
4138 ui_out_field_string (uiout
, "signal-name",
4139 target_signal_to_name (stop_info
));
4140 annotate_signal_name_end ();
4141 ui_out_text (uiout
, ", ");
4142 annotate_signal_string ();
4143 ui_out_field_string (uiout
, "signal-meaning",
4144 target_signal_to_string (stop_info
));
4145 annotate_signal_string_end ();
4146 ui_out_text (uiout
, ".\n");
4147 ui_out_text (uiout
, "The program no longer exists.\n");
4150 /* The inferior program is finished. */
4151 annotate_exited (stop_info
);
4154 if (ui_out_is_mi_like_p (uiout
))
4155 ui_out_field_string (uiout
, "reason",
4156 async_reason_lookup (EXEC_ASYNC_EXITED
));
4157 ui_out_text (uiout
, "\nProgram exited with code ");
4158 ui_out_field_fmt (uiout
, "exit-code", "0%o",
4159 (unsigned int) stop_info
);
4160 ui_out_text (uiout
, ".\n");
4164 if (ui_out_is_mi_like_p (uiout
))
4167 async_reason_lookup (EXEC_ASYNC_EXITED_NORMALLY
));
4168 ui_out_text (uiout
, "\nProgram exited normally.\n");
4170 /* Support the --return-child-result option. */
4171 return_child_result_value
= stop_info
;
4173 case SIGNAL_RECEIVED
:
4174 /* Signal received. The signal table tells us to print about
4178 if (stop_info
== TARGET_SIGNAL_0
&& !ui_out_is_mi_like_p (uiout
))
4180 struct thread_info
*t
= inferior_thread ();
4182 ui_out_text (uiout
, "\n[");
4183 ui_out_field_string (uiout
, "thread-name",
4184 target_pid_to_str (t
->ptid
));
4185 ui_out_field_fmt (uiout
, "thread-id", "] #%d", t
->num
);
4186 ui_out_text (uiout
, " stopped");
4190 ui_out_text (uiout
, "\nProgram received signal ");
4191 annotate_signal_name ();
4192 if (ui_out_is_mi_like_p (uiout
))
4194 (uiout
, "reason", async_reason_lookup (EXEC_ASYNC_SIGNAL_RECEIVED
));
4195 ui_out_field_string (uiout
, "signal-name",
4196 target_signal_to_name (stop_info
));
4197 annotate_signal_name_end ();
4198 ui_out_text (uiout
, ", ");
4199 annotate_signal_string ();
4200 ui_out_field_string (uiout
, "signal-meaning",
4201 target_signal_to_string (stop_info
));
4202 annotate_signal_string_end ();
4204 ui_out_text (uiout
, ".\n");
4207 /* Reverse execution: target ran out of history info. */
4208 ui_out_text (uiout
, "\nNo more reverse-execution history.\n");
4211 internal_error (__FILE__
, __LINE__
,
4212 _("print_stop_reason: unrecognized enum value"));
4218 /* Here to return control to GDB when the inferior stops for real.
4219 Print appropriate messages, remove breakpoints, give terminal our modes.
4221 STOP_PRINT_FRAME nonzero means print the executing frame
4222 (pc, function, args, file, line number and line text).
4223 BREAKPOINTS_FAILED nonzero means stop was due to error
4224 attempting to insert breakpoints. */
4229 struct target_waitstatus last
;
4231 struct cleanup
*old_chain
= make_cleanup (null_cleanup
, NULL
);
4233 get_last_target_status (&last_ptid
, &last
);
4235 /* If an exception is thrown from this point on, make sure to
4236 propagate GDB's knowledge of the executing state to the
4237 frontend/user running state. A QUIT is an easy exception to see
4238 here, so do this before any filtered output. */
4239 if (target_has_execution
)
4242 old_chain
= make_cleanup (finish_thread_state_cleanup
, &minus_one_ptid
);
4243 else if (last
.kind
!= TARGET_WAITKIND_SIGNALLED
4244 && last
.kind
!= TARGET_WAITKIND_EXITED
)
4245 old_chain
= make_cleanup (finish_thread_state_cleanup
, &inferior_ptid
);
4248 /* In non-stop mode, we don't want GDB to switch threads behind the
4249 user's back, to avoid races where the user is typing a command to
4250 apply to thread x, but GDB switches to thread y before the user
4251 finishes entering the command. */
4253 /* As with the notification of thread events, we want to delay
4254 notifying the user that we've switched thread context until
4255 the inferior actually stops.
4257 There's no point in saying anything if the inferior has exited.
4258 Note that SIGNALLED here means "exited with a signal", not
4259 "received a signal". */
4261 && !ptid_equal (previous_inferior_ptid
, inferior_ptid
)
4262 && target_has_execution
4263 && last
.kind
!= TARGET_WAITKIND_SIGNALLED
4264 && last
.kind
!= TARGET_WAITKIND_EXITED
)
4266 target_terminal_ours_for_output ();
4267 printf_filtered (_("[Switching to %s]\n"),
4268 target_pid_to_str (inferior_ptid
));
4269 annotate_thread_changed ();
4270 previous_inferior_ptid
= inferior_ptid
;
4273 if (!breakpoints_always_inserted_mode () && target_has_execution
)
4275 if (remove_breakpoints ())
4277 target_terminal_ours_for_output ();
4278 printf_filtered (_("\
4279 Cannot remove breakpoints because program is no longer writable.\n\
4280 Further execution is probably impossible.\n"));
4284 /* If an auto-display called a function and that got a signal,
4285 delete that auto-display to avoid an infinite recursion. */
4287 if (stopped_by_random_signal
)
4288 disable_current_display ();
4290 /* Don't print a message if in the middle of doing a "step n"
4291 operation for n > 1 */
4292 if (target_has_execution
4293 && last
.kind
!= TARGET_WAITKIND_SIGNALLED
4294 && last
.kind
!= TARGET_WAITKIND_EXITED
4295 && inferior_thread ()->step_multi
4296 && inferior_thread ()->stop_step
)
4299 target_terminal_ours ();
4301 /* Set the current source location. This will also happen if we
4302 display the frame below, but the current SAL will be incorrect
4303 during a user hook-stop function. */
4304 if (target_has_stack
&& !stop_stack_dummy
)
4305 set_current_sal_from_frame (get_current_frame (), 1);
4307 /* Let the user/frontend see the threads as stopped. */
4308 do_cleanups (old_chain
);
4310 /* Look up the hook_stop and run it (CLI internally handles problem
4311 of stop_command's pre-hook not existing). */
4313 catch_errors (hook_stop_stub
, stop_command
,
4314 "Error while running hook_stop:\n", RETURN_MASK_ALL
);
4316 if (!target_has_stack
)
4319 if (last
.kind
== TARGET_WAITKIND_SIGNALLED
4320 || last
.kind
== TARGET_WAITKIND_EXITED
)
4323 /* Select innermost stack frame - i.e., current frame is frame 0,
4324 and current location is based on that.
4325 Don't do this on return from a stack dummy routine,
4326 or if the program has exited. */
4328 if (!stop_stack_dummy
)
4330 select_frame (get_current_frame ());
4332 /* Print current location without a level number, if
4333 we have changed functions or hit a breakpoint.
4334 Print source line if we have one.
4335 bpstat_print() contains the logic deciding in detail
4336 what to print, based on the event(s) that just occurred. */
4338 /* If --batch-silent is enabled then there's no need to print the current
4339 source location, and to try risks causing an error message about
4340 missing source files. */
4341 if (stop_print_frame
&& !batch_silent
)
4345 int do_frame_printing
= 1;
4346 struct thread_info
*tp
= inferior_thread ();
4348 bpstat_ret
= bpstat_print (tp
->stop_bpstat
);
4352 /* If we had hit a shared library event breakpoint,
4353 bpstat_print would print out this message. If we hit
4354 an OS-level shared library event, do the same
4356 if (last
.kind
== TARGET_WAITKIND_LOADED
)
4358 printf_filtered (_("Stopped due to shared library event\n"));
4359 source_flag
= SRC_LINE
; /* something bogus */
4360 do_frame_printing
= 0;
4364 /* FIXME: cagney/2002-12-01: Given that a frame ID does
4365 (or should) carry around the function and does (or
4366 should) use that when doing a frame comparison. */
4368 && frame_id_eq (tp
->step_frame_id
,
4369 get_frame_id (get_current_frame ()))
4370 && step_start_function
== find_pc_function (stop_pc
))
4371 source_flag
= SRC_LINE
; /* finished step, just print source line */
4373 source_flag
= SRC_AND_LOC
; /* print location and source line */
4375 case PRINT_SRC_AND_LOC
:
4376 source_flag
= SRC_AND_LOC
; /* print location and source line */
4378 case PRINT_SRC_ONLY
:
4379 source_flag
= SRC_LINE
;
4382 source_flag
= SRC_LINE
; /* something bogus */
4383 do_frame_printing
= 0;
4386 internal_error (__FILE__
, __LINE__
, _("Unknown value."));
4389 /* The behavior of this routine with respect to the source
4391 SRC_LINE: Print only source line
4392 LOCATION: Print only location
4393 SRC_AND_LOC: Print location and source line */
4394 if (do_frame_printing
)
4395 print_stack_frame (get_selected_frame (NULL
), 0, source_flag
);
4397 /* Display the auto-display expressions. */
4402 /* Save the function value return registers, if we care.
4403 We might be about to restore their previous contents. */
4404 if (inferior_thread ()->proceed_to_finish
)
4406 /* This should not be necessary. */
4408 regcache_xfree (stop_registers
);
4410 /* NB: The copy goes through to the target picking up the value of
4411 all the registers. */
4412 stop_registers
= regcache_dup (get_current_regcache ());
4415 if (stop_stack_dummy
)
4417 /* Pop the empty frame that contains the stack dummy.
4418 This also restores inferior state prior to the call
4419 (struct inferior_thread_state). */
4420 struct frame_info
*frame
= get_current_frame ();
4421 gdb_assert (get_frame_type (frame
) == DUMMY_FRAME
);
4423 /* frame_pop() calls reinit_frame_cache as the last thing it does
4424 which means there's currently no selected frame. We don't need
4425 to re-establish a selected frame if the dummy call returns normally,
4426 that will be done by restore_inferior_status. However, we do have
4427 to handle the case where the dummy call is returning after being
4428 stopped (e.g. the dummy call previously hit a breakpoint). We
4429 can't know which case we have so just always re-establish a
4430 selected frame here. */
4431 select_frame (get_current_frame ());
4435 annotate_stopped ();
4436 if (!suppress_stop_observer
4437 && !(target_has_execution
4438 && last
.kind
!= TARGET_WAITKIND_SIGNALLED
4439 && last
.kind
!= TARGET_WAITKIND_EXITED
4440 && inferior_thread ()->step_multi
))
4442 if (!ptid_equal (inferior_ptid
, null_ptid
))
4443 observer_notify_normal_stop (inferior_thread ()->stop_bpstat
,
4446 observer_notify_normal_stop (NULL
, stop_print_frame
);
4449 if (target_has_execution
)
4451 if (last
.kind
!= TARGET_WAITKIND_SIGNALLED
4452 && last
.kind
!= TARGET_WAITKIND_EXITED
)
4453 /* Delete the breakpoint we stopped at, if it wants to be deleted.
4454 Delete any breakpoint that is to be deleted at the next stop. */
4455 breakpoint_auto_delete (inferior_thread ()->stop_bpstat
);
4460 hook_stop_stub (void *cmd
)
4462 execute_cmd_pre_hook ((struct cmd_list_element
*) cmd
);
4467 signal_stop_state (int signo
)
4469 return signal_stop
[signo
];
4473 signal_print_state (int signo
)
4475 return signal_print
[signo
];
4479 signal_pass_state (int signo
)
4481 return signal_program
[signo
];
4485 signal_stop_update (int signo
, int state
)
4487 int ret
= signal_stop
[signo
];
4488 signal_stop
[signo
] = state
;
4493 signal_print_update (int signo
, int state
)
4495 int ret
= signal_print
[signo
];
4496 signal_print
[signo
] = state
;
4501 signal_pass_update (int signo
, int state
)
4503 int ret
= signal_program
[signo
];
4504 signal_program
[signo
] = state
;
4509 sig_print_header (void)
4511 printf_filtered (_("\
4512 Signal Stop\tPrint\tPass to program\tDescription\n"));
4516 sig_print_info (enum target_signal oursig
)
4518 const char *name
= target_signal_to_name (oursig
);
4519 int name_padding
= 13 - strlen (name
);
4521 if (name_padding
<= 0)
4524 printf_filtered ("%s", name
);
4525 printf_filtered ("%*.*s ", name_padding
, name_padding
, " ");
4526 printf_filtered ("%s\t", signal_stop
[oursig
] ? "Yes" : "No");
4527 printf_filtered ("%s\t", signal_print
[oursig
] ? "Yes" : "No");
4528 printf_filtered ("%s\t\t", signal_program
[oursig
] ? "Yes" : "No");
4529 printf_filtered ("%s\n", target_signal_to_string (oursig
));
4532 /* Specify how various signals in the inferior should be handled. */
4535 handle_command (char *args
, int from_tty
)
4538 int digits
, wordlen
;
4539 int sigfirst
, signum
, siglast
;
4540 enum target_signal oursig
;
4543 unsigned char *sigs
;
4544 struct cleanup
*old_chain
;
4548 error_no_arg (_("signal to handle"));
4551 /* Allocate and zero an array of flags for which signals to handle. */
4553 nsigs
= (int) TARGET_SIGNAL_LAST
;
4554 sigs
= (unsigned char *) alloca (nsigs
);
4555 memset (sigs
, 0, nsigs
);
4557 /* Break the command line up into args. */
4559 argv
= gdb_buildargv (args
);
4560 old_chain
= make_cleanup_freeargv (argv
);
4562 /* Walk through the args, looking for signal oursigs, signal names, and
4563 actions. Signal numbers and signal names may be interspersed with
4564 actions, with the actions being performed for all signals cumulatively
4565 specified. Signal ranges can be specified as <LOW>-<HIGH>. */
4567 while (*argv
!= NULL
)
4569 wordlen
= strlen (*argv
);
4570 for (digits
= 0; isdigit ((*argv
)[digits
]); digits
++)
4574 sigfirst
= siglast
= -1;
4576 if (wordlen
>= 1 && !strncmp (*argv
, "all", wordlen
))
4578 /* Apply action to all signals except those used by the
4579 debugger. Silently skip those. */
4582 siglast
= nsigs
- 1;
4584 else if (wordlen
>= 1 && !strncmp (*argv
, "stop", wordlen
))
4586 SET_SIGS (nsigs
, sigs
, signal_stop
);
4587 SET_SIGS (nsigs
, sigs
, signal_print
);
4589 else if (wordlen
>= 1 && !strncmp (*argv
, "ignore", wordlen
))
4591 UNSET_SIGS (nsigs
, sigs
, signal_program
);
4593 else if (wordlen
>= 2 && !strncmp (*argv
, "print", wordlen
))
4595 SET_SIGS (nsigs
, sigs
, signal_print
);
4597 else if (wordlen
>= 2 && !strncmp (*argv
, "pass", wordlen
))
4599 SET_SIGS (nsigs
, sigs
, signal_program
);
4601 else if (wordlen
>= 3 && !strncmp (*argv
, "nostop", wordlen
))
4603 UNSET_SIGS (nsigs
, sigs
, signal_stop
);
4605 else if (wordlen
>= 3 && !strncmp (*argv
, "noignore", wordlen
))
4607 SET_SIGS (nsigs
, sigs
, signal_program
);
4609 else if (wordlen
>= 4 && !strncmp (*argv
, "noprint", wordlen
))
4611 UNSET_SIGS (nsigs
, sigs
, signal_print
);
4612 UNSET_SIGS (nsigs
, sigs
, signal_stop
);
4614 else if (wordlen
>= 4 && !strncmp (*argv
, "nopass", wordlen
))
4616 UNSET_SIGS (nsigs
, sigs
, signal_program
);
4618 else if (digits
> 0)
4620 /* It is numeric. The numeric signal refers to our own
4621 internal signal numbering from target.h, not to host/target
4622 signal number. This is a feature; users really should be
4623 using symbolic names anyway, and the common ones like
4624 SIGHUP, SIGINT, SIGALRM, etc. will work right anyway. */
4626 sigfirst
= siglast
= (int)
4627 target_signal_from_command (atoi (*argv
));
4628 if ((*argv
)[digits
] == '-')
4631 target_signal_from_command (atoi ((*argv
) + digits
+ 1));
4633 if (sigfirst
> siglast
)
4635 /* Bet he didn't figure we'd think of this case... */
4643 oursig
= target_signal_from_name (*argv
);
4644 if (oursig
!= TARGET_SIGNAL_UNKNOWN
)
4646 sigfirst
= siglast
= (int) oursig
;
4650 /* Not a number and not a recognized flag word => complain. */
4651 error (_("Unrecognized or ambiguous flag word: \"%s\"."), *argv
);
4655 /* If any signal numbers or symbol names were found, set flags for
4656 which signals to apply actions to. */
4658 for (signum
= sigfirst
; signum
>= 0 && signum
<= siglast
; signum
++)
4660 switch ((enum target_signal
) signum
)
4662 case TARGET_SIGNAL_TRAP
:
4663 case TARGET_SIGNAL_INT
:
4664 if (!allsigs
&& !sigs
[signum
])
4666 if (query (_("%s is used by the debugger.\n\
4667 Are you sure you want to change it? "), target_signal_to_name ((enum target_signal
) signum
)))
4673 printf_unfiltered (_("Not confirmed, unchanged.\n"));
4674 gdb_flush (gdb_stdout
);
4678 case TARGET_SIGNAL_0
:
4679 case TARGET_SIGNAL_DEFAULT
:
4680 case TARGET_SIGNAL_UNKNOWN
:
4681 /* Make sure that "all" doesn't print these. */
4692 for (signum
= 0; signum
< nsigs
; signum
++)
4695 target_notice_signals (inferior_ptid
);
4699 /* Show the results. */
4700 sig_print_header ();
4701 for (; signum
< nsigs
; signum
++)
4703 sig_print_info (signum
);
4709 do_cleanups (old_chain
);
4713 xdb_handle_command (char *args
, int from_tty
)
4716 struct cleanup
*old_chain
;
4719 error_no_arg (_("xdb command"));
4721 /* Break the command line up into args. */
4723 argv
= gdb_buildargv (args
);
4724 old_chain
= make_cleanup_freeargv (argv
);
4725 if (argv
[1] != (char *) NULL
)
4730 bufLen
= strlen (argv
[0]) + 20;
4731 argBuf
= (char *) xmalloc (bufLen
);
4735 enum target_signal oursig
;
4737 oursig
= target_signal_from_name (argv
[0]);
4738 memset (argBuf
, 0, bufLen
);
4739 if (strcmp (argv
[1], "Q") == 0)
4740 sprintf (argBuf
, "%s %s", argv
[0], "noprint");
4743 if (strcmp (argv
[1], "s") == 0)
4745 if (!signal_stop
[oursig
])
4746 sprintf (argBuf
, "%s %s", argv
[0], "stop");
4748 sprintf (argBuf
, "%s %s", argv
[0], "nostop");
4750 else if (strcmp (argv
[1], "i") == 0)
4752 if (!signal_program
[oursig
])
4753 sprintf (argBuf
, "%s %s", argv
[0], "pass");
4755 sprintf (argBuf
, "%s %s", argv
[0], "nopass");
4757 else if (strcmp (argv
[1], "r") == 0)
4759 if (!signal_print
[oursig
])
4760 sprintf (argBuf
, "%s %s", argv
[0], "print");
4762 sprintf (argBuf
, "%s %s", argv
[0], "noprint");
4768 handle_command (argBuf
, from_tty
);
4770 printf_filtered (_("Invalid signal handling flag.\n"));
4775 do_cleanups (old_chain
);
4778 /* Print current contents of the tables set by the handle command.
4779 It is possible we should just be printing signals actually used
4780 by the current target (but for things to work right when switching
4781 targets, all signals should be in the signal tables). */
4784 signals_info (char *signum_exp
, int from_tty
)
4786 enum target_signal oursig
;
4787 sig_print_header ();
4791 /* First see if this is a symbol name. */
4792 oursig
= target_signal_from_name (signum_exp
);
4793 if (oursig
== TARGET_SIGNAL_UNKNOWN
)
4795 /* No, try numeric. */
4797 target_signal_from_command (parse_and_eval_long (signum_exp
));
4799 sig_print_info (oursig
);
4803 printf_filtered ("\n");
4804 /* These ugly casts brought to you by the native VAX compiler. */
4805 for (oursig
= TARGET_SIGNAL_FIRST
;
4806 (int) oursig
< (int) TARGET_SIGNAL_LAST
;
4807 oursig
= (enum target_signal
) ((int) oursig
+ 1))
4811 if (oursig
!= TARGET_SIGNAL_UNKNOWN
4812 && oursig
!= TARGET_SIGNAL_DEFAULT
&& oursig
!= TARGET_SIGNAL_0
)
4813 sig_print_info (oursig
);
4816 printf_filtered (_("\nUse the \"handle\" command to change these tables.\n"));
4819 /* The $_siginfo convenience variable is a bit special. We don't know
4820 for sure the type of the value until we actually have a chance to
4821 fetch the data. The type can change depending on gdbarch, so it it
4822 also dependent on which thread you have selected.
4824 1. making $_siginfo be an internalvar that creates a new value on
4827 2. making the value of $_siginfo be an lval_computed value. */
4829 /* This function implements the lval_computed support for reading a
4833 siginfo_value_read (struct value
*v
)
4835 LONGEST transferred
;
4838 target_read (¤t_target
, TARGET_OBJECT_SIGNAL_INFO
,
4840 value_contents_all_raw (v
),
4842 TYPE_LENGTH (value_type (v
)));
4844 if (transferred
!= TYPE_LENGTH (value_type (v
)))
4845 error (_("Unable to read siginfo"));
4848 /* This function implements the lval_computed support for writing a
4852 siginfo_value_write (struct value
*v
, struct value
*fromval
)
4854 LONGEST transferred
;
4856 transferred
= target_write (¤t_target
,
4857 TARGET_OBJECT_SIGNAL_INFO
,
4859 value_contents_all_raw (fromval
),
4861 TYPE_LENGTH (value_type (fromval
)));
4863 if (transferred
!= TYPE_LENGTH (value_type (fromval
)))
4864 error (_("Unable to write siginfo"));
4867 static struct lval_funcs siginfo_value_funcs
=
4873 /* Return a new value with the correct type for the siginfo object of
4874 the current thread. Return a void value if there's no object
4877 static struct value
*
4878 siginfo_make_value (struct internalvar
*var
)
4881 struct gdbarch
*gdbarch
;
4883 if (target_has_stack
4884 && !ptid_equal (inferior_ptid
, null_ptid
))
4886 gdbarch
= get_frame_arch (get_current_frame ());
4888 if (gdbarch_get_siginfo_type_p (gdbarch
))
4890 type
= gdbarch_get_siginfo_type (gdbarch
);
4892 return allocate_computed_value (type
, &siginfo_value_funcs
, NULL
);
4896 return allocate_value (builtin_type_void
);
4900 /* Inferior thread state.
4901 These are details related to the inferior itself, and don't include
4902 things like what frame the user had selected or what gdb was doing
4903 with the target at the time.
4904 For inferior function calls these are things we want to restore
4905 regardless of whether the function call successfully completes
4906 or the dummy frame has to be manually popped. */
4908 struct inferior_thread_state
4910 enum target_signal stop_signal
;
4912 struct regcache
*registers
;
4915 struct inferior_thread_state
*
4916 save_inferior_thread_state (void)
4918 struct inferior_thread_state
*inf_state
= XMALLOC (struct inferior_thread_state
);
4919 struct thread_info
*tp
= inferior_thread ();
4921 inf_state
->stop_signal
= tp
->stop_signal
;
4922 inf_state
->stop_pc
= stop_pc
;
4924 inf_state
->registers
= regcache_dup (get_current_regcache ());
4929 /* Restore inferior session state to INF_STATE. */
4932 restore_inferior_thread_state (struct inferior_thread_state
*inf_state
)
4934 struct thread_info
*tp
= inferior_thread ();
4936 tp
->stop_signal
= inf_state
->stop_signal
;
4937 stop_pc
= inf_state
->stop_pc
;
4939 /* The inferior can be gone if the user types "print exit(0)"
4940 (and perhaps other times). */
4941 if (target_has_execution
)
4942 /* NB: The register write goes through to the target. */
4943 regcache_cpy (get_current_regcache (), inf_state
->registers
);
4944 regcache_xfree (inf_state
->registers
);
4949 do_restore_inferior_thread_state_cleanup (void *state
)
4951 restore_inferior_thread_state (state
);
4955 make_cleanup_restore_inferior_thread_state (struct inferior_thread_state
*inf_state
)
4957 return make_cleanup (do_restore_inferior_thread_state_cleanup
, inf_state
);
4961 discard_inferior_thread_state (struct inferior_thread_state
*inf_state
)
4963 regcache_xfree (inf_state
->registers
);
4968 get_inferior_thread_state_regcache (struct inferior_thread_state
*inf_state
)
4970 return inf_state
->registers
;
4973 /* Session related state for inferior function calls.
4974 These are the additional bits of state that need to be restored
4975 when an inferior function call successfully completes. */
4977 struct inferior_status
4981 int stop_stack_dummy
;
4982 int stopped_by_random_signal
;
4983 int stepping_over_breakpoint
;
4984 CORE_ADDR step_range_start
;
4985 CORE_ADDR step_range_end
;
4986 struct frame_id step_frame_id
;
4987 enum step_over_calls_kind step_over_calls
;
4988 CORE_ADDR step_resume_break_address
;
4989 int stop_after_trap
;
4992 /* ID if the selected frame when the inferior function call was made. */
4993 struct frame_id selected_frame_id
;
4995 int breakpoint_proceeded
;
4996 int proceed_to_finish
;
4999 /* Save all of the information associated with the inferior<==>gdb
5002 struct inferior_status
*
5003 save_inferior_status (void)
5005 struct inferior_status
*inf_status
= XMALLOC (struct inferior_status
);
5006 struct thread_info
*tp
= inferior_thread ();
5007 struct inferior
*inf
= current_inferior ();
5009 inf_status
->stop_step
= tp
->stop_step
;
5010 inf_status
->stop_stack_dummy
= stop_stack_dummy
;
5011 inf_status
->stopped_by_random_signal
= stopped_by_random_signal
;
5012 inf_status
->stepping_over_breakpoint
= tp
->trap_expected
;
5013 inf_status
->step_range_start
= tp
->step_range_start
;
5014 inf_status
->step_range_end
= tp
->step_range_end
;
5015 inf_status
->step_frame_id
= tp
->step_frame_id
;
5016 inf_status
->step_over_calls
= tp
->step_over_calls
;
5017 inf_status
->stop_after_trap
= stop_after_trap
;
5018 inf_status
->stop_soon
= inf
->stop_soon
;
5019 /* Save original bpstat chain here; replace it with copy of chain.
5020 If caller's caller is walking the chain, they'll be happier if we
5021 hand them back the original chain when restore_inferior_status is
5023 inf_status
->stop_bpstat
= tp
->stop_bpstat
;
5024 tp
->stop_bpstat
= bpstat_copy (tp
->stop_bpstat
);
5025 inf_status
->breakpoint_proceeded
= breakpoint_proceeded
;
5026 inf_status
->proceed_to_finish
= tp
->proceed_to_finish
;
5028 inf_status
->selected_frame_id
= get_frame_id (get_selected_frame (NULL
));
5034 restore_selected_frame (void *args
)
5036 struct frame_id
*fid
= (struct frame_id
*) args
;
5037 struct frame_info
*frame
;
5039 frame
= frame_find_by_id (*fid
);
5041 /* If inf_status->selected_frame_id is NULL, there was no previously
5045 warning (_("Unable to restore previously selected frame."));
5049 select_frame (frame
);
5054 /* Restore inferior session state to INF_STATUS. */
5057 restore_inferior_status (struct inferior_status
*inf_status
)
5059 struct thread_info
*tp
= inferior_thread ();
5060 struct inferior
*inf
= current_inferior ();
5062 tp
->stop_step
= inf_status
->stop_step
;
5063 stop_stack_dummy
= inf_status
->stop_stack_dummy
;
5064 stopped_by_random_signal
= inf_status
->stopped_by_random_signal
;
5065 tp
->trap_expected
= inf_status
->stepping_over_breakpoint
;
5066 tp
->step_range_start
= inf_status
->step_range_start
;
5067 tp
->step_range_end
= inf_status
->step_range_end
;
5068 tp
->step_frame_id
= inf_status
->step_frame_id
;
5069 tp
->step_over_calls
= inf_status
->step_over_calls
;
5070 stop_after_trap
= inf_status
->stop_after_trap
;
5071 inf
->stop_soon
= inf_status
->stop_soon
;
5072 bpstat_clear (&tp
->stop_bpstat
);
5073 tp
->stop_bpstat
= inf_status
->stop_bpstat
;
5074 inf_status
->stop_bpstat
= NULL
;
5075 breakpoint_proceeded
= inf_status
->breakpoint_proceeded
;
5076 tp
->proceed_to_finish
= inf_status
->proceed_to_finish
;
5078 if (target_has_stack
)
5080 /* The point of catch_errors is that if the stack is clobbered,
5081 walking the stack might encounter a garbage pointer and
5082 error() trying to dereference it. */
5084 (restore_selected_frame
, &inf_status
->selected_frame_id
,
5085 "Unable to restore previously selected frame:\n",
5086 RETURN_MASK_ERROR
) == 0)
5087 /* Error in restoring the selected frame. Select the innermost
5089 select_frame (get_current_frame ());
5096 do_restore_inferior_status_cleanup (void *sts
)
5098 restore_inferior_status (sts
);
5102 make_cleanup_restore_inferior_status (struct inferior_status
*inf_status
)
5104 return make_cleanup (do_restore_inferior_status_cleanup
, inf_status
);
5108 discard_inferior_status (struct inferior_status
*inf_status
)
5110 /* See save_inferior_status for info on stop_bpstat. */
5111 bpstat_clear (&inf_status
->stop_bpstat
);
5116 inferior_has_forked (ptid_t pid
, ptid_t
*child_pid
)
5118 struct target_waitstatus last
;
5121 get_last_target_status (&last_ptid
, &last
);
5123 if (last
.kind
!= TARGET_WAITKIND_FORKED
)
5126 if (!ptid_equal (last_ptid
, pid
))
5129 *child_pid
= last
.value
.related_pid
;
5134 inferior_has_vforked (ptid_t pid
, ptid_t
*child_pid
)
5136 struct target_waitstatus last
;
5139 get_last_target_status (&last_ptid
, &last
);
5141 if (last
.kind
!= TARGET_WAITKIND_VFORKED
)
5144 if (!ptid_equal (last_ptid
, pid
))
5147 *child_pid
= last
.value
.related_pid
;
5152 inferior_has_execd (ptid_t pid
, char **execd_pathname
)
5154 struct target_waitstatus last
;
5157 get_last_target_status (&last_ptid
, &last
);
5159 if (last
.kind
!= TARGET_WAITKIND_EXECD
)
5162 if (!ptid_equal (last_ptid
, pid
))
5165 *execd_pathname
= xstrdup (last
.value
.execd_pathname
);
5169 /* Oft used ptids */
5171 ptid_t minus_one_ptid
;
5173 /* Create a ptid given the necessary PID, LWP, and TID components. */
5176 ptid_build (int pid
, long lwp
, long tid
)
5186 /* Create a ptid from just a pid. */
5189 pid_to_ptid (int pid
)
5191 return ptid_build (pid
, 0, 0);
5194 /* Fetch the pid (process id) component from a ptid. */
5197 ptid_get_pid (ptid_t ptid
)
5202 /* Fetch the lwp (lightweight process) component from a ptid. */
5205 ptid_get_lwp (ptid_t ptid
)
5210 /* Fetch the tid (thread id) component from a ptid. */
5213 ptid_get_tid (ptid_t ptid
)
5218 /* ptid_equal() is used to test equality of two ptids. */
5221 ptid_equal (ptid_t ptid1
, ptid_t ptid2
)
5223 return (ptid1
.pid
== ptid2
.pid
&& ptid1
.lwp
== ptid2
.lwp
5224 && ptid1
.tid
== ptid2
.tid
);
5227 /* Returns true if PTID represents a process. */
5230 ptid_is_pid (ptid_t ptid
)
5232 if (ptid_equal (minus_one_ptid
, ptid
))
5234 if (ptid_equal (null_ptid
, ptid
))
5237 return (ptid_get_lwp (ptid
) == 0 && ptid_get_tid (ptid
) == 0);
5240 /* restore_inferior_ptid() will be used by the cleanup machinery
5241 to restore the inferior_ptid value saved in a call to
5242 save_inferior_ptid(). */
5245 restore_inferior_ptid (void *arg
)
5247 ptid_t
*saved_ptid_ptr
= arg
;
5248 inferior_ptid
= *saved_ptid_ptr
;
5252 /* Save the value of inferior_ptid so that it may be restored by a
5253 later call to do_cleanups(). Returns the struct cleanup pointer
5254 needed for later doing the cleanup. */
5257 save_inferior_ptid (void)
5259 ptid_t
*saved_ptid_ptr
;
5261 saved_ptid_ptr
= xmalloc (sizeof (ptid_t
));
5262 *saved_ptid_ptr
= inferior_ptid
;
5263 return make_cleanup (restore_inferior_ptid
, saved_ptid_ptr
);
5267 /* User interface for reverse debugging:
5268 Set exec-direction / show exec-direction commands
5269 (returns error unless target implements to_set_exec_direction method). */
5271 enum exec_direction_kind execution_direction
= EXEC_FORWARD
;
5272 static const char exec_forward
[] = "forward";
5273 static const char exec_reverse
[] = "reverse";
5274 static const char *exec_direction
= exec_forward
;
5275 static const char *exec_direction_names
[] = {
5282 set_exec_direction_func (char *args
, int from_tty
,
5283 struct cmd_list_element
*cmd
)
5285 if (target_can_execute_reverse
)
5287 if (!strcmp (exec_direction
, exec_forward
))
5288 execution_direction
= EXEC_FORWARD
;
5289 else if (!strcmp (exec_direction
, exec_reverse
))
5290 execution_direction
= EXEC_REVERSE
;
5295 show_exec_direction_func (struct ui_file
*out
, int from_tty
,
5296 struct cmd_list_element
*cmd
, const char *value
)
5298 switch (execution_direction
) {
5300 fprintf_filtered (out
, _("Forward.\n"));
5303 fprintf_filtered (out
, _("Reverse.\n"));
5307 fprintf_filtered (out
,
5308 _("Forward (target `%s' does not support exec-direction).\n"),
5314 /* User interface for non-stop mode. */
5317 static int non_stop_1
= 0;
5320 set_non_stop (char *args
, int from_tty
,
5321 struct cmd_list_element
*c
)
5323 if (target_has_execution
)
5325 non_stop_1
= non_stop
;
5326 error (_("Cannot change this setting while the inferior is running."));
5329 non_stop
= non_stop_1
;
5333 show_non_stop (struct ui_file
*file
, int from_tty
,
5334 struct cmd_list_element
*c
, const char *value
)
5336 fprintf_filtered (file
,
5337 _("Controlling the inferior in non-stop mode is %s.\n"),
5343 _initialize_infrun (void)
5347 struct cmd_list_element
*c
;
5349 add_info ("signals", signals_info
, _("\
5350 What debugger does when program gets various signals.\n\
5351 Specify a signal as argument to print info on that signal only."));
5352 add_info_alias ("handle", "signals", 0);
5354 add_com ("handle", class_run
, handle_command
, _("\
5355 Specify how to handle a signal.\n\
5356 Args are signals and actions to apply to those signals.\n\
5357 Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\
5358 from 1-15 are allowed for compatibility with old versions of GDB.\n\
5359 Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\
5360 The special arg \"all\" is recognized to mean all signals except those\n\
5361 used by the debugger, typically SIGTRAP and SIGINT.\n\
5362 Recognized actions include \"stop\", \"nostop\", \"print\", \"noprint\",\n\
5363 \"pass\", \"nopass\", \"ignore\", or \"noignore\".\n\
5364 Stop means reenter debugger if this signal happens (implies print).\n\
5365 Print means print a message if this signal happens.\n\
5366 Pass means let program see this signal; otherwise program doesn't know.\n\
5367 Ignore is a synonym for nopass and noignore is a synonym for pass.\n\
5368 Pass and Stop may be combined."));
5371 add_com ("lz", class_info
, signals_info
, _("\
5372 What debugger does when program gets various signals.\n\
5373 Specify a signal as argument to print info on that signal only."));
5374 add_com ("z", class_run
, xdb_handle_command
, _("\
5375 Specify how to handle a signal.\n\
5376 Args are signals and actions to apply to those signals.\n\
5377 Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\
5378 from 1-15 are allowed for compatibility with old versions of GDB.\n\
5379 Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\
5380 The special arg \"all\" is recognized to mean all signals except those\n\
5381 used by the debugger, typically SIGTRAP and SIGINT.\n\
5382 Recognized actions include \"s\" (toggles between stop and nostop), \n\
5383 \"r\" (toggles between print and noprint), \"i\" (toggles between pass and \
5384 nopass), \"Q\" (noprint)\n\
5385 Stop means reenter debugger if this signal happens (implies print).\n\
5386 Print means print a message if this signal happens.\n\
5387 Pass means let program see this signal; otherwise program doesn't know.\n\
5388 Ignore is a synonym for nopass and noignore is a synonym for pass.\n\
5389 Pass and Stop may be combined."));
5393 stop_command
= add_cmd ("stop", class_obscure
,
5394 not_just_help_class_command
, _("\
5395 There is no `stop' command, but you can set a hook on `stop'.\n\
5396 This allows you to set a list of commands to be run each time execution\n\
5397 of the program stops."), &cmdlist
);
5399 add_setshow_zinteger_cmd ("infrun", class_maintenance
, &debug_infrun
, _("\
5400 Set inferior debugging."), _("\
5401 Show inferior debugging."), _("\
5402 When non-zero, inferior specific debugging is enabled."),
5405 &setdebuglist
, &showdebuglist
);
5407 add_setshow_boolean_cmd ("displaced", class_maintenance
, &debug_displaced
, _("\
5408 Set displaced stepping debugging."), _("\
5409 Show displaced stepping debugging."), _("\
5410 When non-zero, displaced stepping specific debugging is enabled."),
5412 show_debug_displaced
,
5413 &setdebuglist
, &showdebuglist
);
5415 add_setshow_boolean_cmd ("non-stop", no_class
,
5417 Set whether gdb controls the inferior in non-stop mode."), _("\
5418 Show whether gdb controls the inferior in non-stop mode."), _("\
5419 When debugging a multi-threaded program and this setting is\n\
5420 off (the default, also called all-stop mode), when one thread stops\n\
5421 (for a breakpoint, watchpoint, exception, or similar events), GDB stops\n\
5422 all other threads in the program while you interact with the thread of\n\
5423 interest. When you continue or step a thread, you can allow the other\n\
5424 threads to run, or have them remain stopped, but while you inspect any\n\
5425 thread's state, all threads stop.\n\
5427 In non-stop mode, when one thread stops, other threads can continue\n\
5428 to run freely. You'll be able to step each thread independently,\n\
5429 leave it stopped or free to run as needed."),
5435 numsigs
= (int) TARGET_SIGNAL_LAST
;
5436 signal_stop
= (unsigned char *) xmalloc (sizeof (signal_stop
[0]) * numsigs
);
5437 signal_print
= (unsigned char *)
5438 xmalloc (sizeof (signal_print
[0]) * numsigs
);
5439 signal_program
= (unsigned char *)
5440 xmalloc (sizeof (signal_program
[0]) * numsigs
);
5441 for (i
= 0; i
< numsigs
; i
++)
5444 signal_print
[i
] = 1;
5445 signal_program
[i
] = 1;
5448 /* Signals caused by debugger's own actions
5449 should not be given to the program afterwards. */
5450 signal_program
[TARGET_SIGNAL_TRAP
] = 0;
5451 signal_program
[TARGET_SIGNAL_INT
] = 0;
5453 /* Signals that are not errors should not normally enter the debugger. */
5454 signal_stop
[TARGET_SIGNAL_ALRM
] = 0;
5455 signal_print
[TARGET_SIGNAL_ALRM
] = 0;
5456 signal_stop
[TARGET_SIGNAL_VTALRM
] = 0;
5457 signal_print
[TARGET_SIGNAL_VTALRM
] = 0;
5458 signal_stop
[TARGET_SIGNAL_PROF
] = 0;
5459 signal_print
[TARGET_SIGNAL_PROF
] = 0;
5460 signal_stop
[TARGET_SIGNAL_CHLD
] = 0;
5461 signal_print
[TARGET_SIGNAL_CHLD
] = 0;
5462 signal_stop
[TARGET_SIGNAL_IO
] = 0;
5463 signal_print
[TARGET_SIGNAL_IO
] = 0;
5464 signal_stop
[TARGET_SIGNAL_POLL
] = 0;
5465 signal_print
[TARGET_SIGNAL_POLL
] = 0;
5466 signal_stop
[TARGET_SIGNAL_URG
] = 0;
5467 signal_print
[TARGET_SIGNAL_URG
] = 0;
5468 signal_stop
[TARGET_SIGNAL_WINCH
] = 0;
5469 signal_print
[TARGET_SIGNAL_WINCH
] = 0;
5471 /* These signals are used internally by user-level thread
5472 implementations. (See signal(5) on Solaris.) Like the above
5473 signals, a healthy program receives and handles them as part of
5474 its normal operation. */
5475 signal_stop
[TARGET_SIGNAL_LWP
] = 0;
5476 signal_print
[TARGET_SIGNAL_LWP
] = 0;
5477 signal_stop
[TARGET_SIGNAL_WAITING
] = 0;
5478 signal_print
[TARGET_SIGNAL_WAITING
] = 0;
5479 signal_stop
[TARGET_SIGNAL_CANCEL
] = 0;
5480 signal_print
[TARGET_SIGNAL_CANCEL
] = 0;
5482 add_setshow_zinteger_cmd ("stop-on-solib-events", class_support
,
5483 &stop_on_solib_events
, _("\
5484 Set stopping for shared library events."), _("\
5485 Show stopping for shared library events."), _("\
5486 If nonzero, gdb will give control to the user when the dynamic linker\n\
5487 notifies gdb of shared library events. The most common event of interest\n\
5488 to the user would be loading/unloading of a new library."),
5490 show_stop_on_solib_events
,
5491 &setlist
, &showlist
);
5493 add_setshow_enum_cmd ("follow-fork-mode", class_run
,
5494 follow_fork_mode_kind_names
,
5495 &follow_fork_mode_string
, _("\
5496 Set debugger response to a program call of fork or vfork."), _("\
5497 Show debugger response to a program call of fork or vfork."), _("\
5498 A fork or vfork creates a new process. follow-fork-mode can be:\n\
5499 parent - the original process is debugged after a fork\n\
5500 child - the new process is debugged after a fork\n\
5501 The unfollowed process will continue to run.\n\
5502 By default, the debugger will follow the parent process."),
5504 show_follow_fork_mode_string
,
5505 &setlist
, &showlist
);
5507 add_setshow_enum_cmd ("scheduler-locking", class_run
,
5508 scheduler_enums
, &scheduler_mode
, _("\
5509 Set mode for locking scheduler during execution."), _("\
5510 Show mode for locking scheduler during execution."), _("\
5511 off == no locking (threads may preempt at any time)\n\
5512 on == full locking (no thread except the current thread may run)\n\
5513 step == scheduler locked during every single-step operation.\n\
5514 In this mode, no other thread may run during a step command.\n\
5515 Other threads may run while stepping over a function call ('next')."),
5516 set_schedlock_func
, /* traps on target vector */
5517 show_scheduler_mode
,
5518 &setlist
, &showlist
);
5520 add_setshow_boolean_cmd ("step-mode", class_run
, &step_stop_if_no_debug
, _("\
5521 Set mode of the step operation."), _("\
5522 Show mode of the step operation."), _("\
5523 When set, doing a step over a function without debug line information\n\
5524 will stop at the first instruction of that function. Otherwise, the\n\
5525 function is skipped and the step command stops at a different source line."),
5527 show_step_stop_if_no_debug
,
5528 &setlist
, &showlist
);
5530 add_setshow_enum_cmd ("displaced-stepping", class_run
,
5531 can_use_displaced_stepping_enum
,
5532 &can_use_displaced_stepping
, _("\
5533 Set debugger's willingness to use displaced stepping."), _("\
5534 Show debugger's willingness to use displaced stepping."), _("\
5535 If on, gdb will use displaced stepping to step over breakpoints if it is\n\
5536 supported by the target architecture. If off, gdb will not use displaced\n\
5537 stepping to step over breakpoints, even if such is supported by the target\n\
5538 architecture. If auto (which is the default), gdb will use displaced stepping\n\
5539 if the target architecture supports it and non-stop mode is active, but will not\n\
5540 use it in all-stop mode (see help set non-stop)."),
5542 show_can_use_displaced_stepping
,
5543 &setlist
, &showlist
);
5545 add_setshow_enum_cmd ("exec-direction", class_run
, exec_direction_names
,
5546 &exec_direction
, _("Set direction of execution.\n\
5547 Options are 'forward' or 'reverse'."),
5548 _("Show direction of execution (forward/reverse)."),
5549 _("Tells gdb whether to execute forward or backward."),
5550 set_exec_direction_func
, show_exec_direction_func
,
5551 &setlist
, &showlist
);
5553 /* ptid initializations */
5554 null_ptid
= ptid_build (0, 0, 0);
5555 minus_one_ptid
= ptid_build (-1, 0, 0);
5556 inferior_ptid
= null_ptid
;
5557 target_last_wait_ptid
= minus_one_ptid
;
5558 displaced_step_ptid
= null_ptid
;
5560 observer_attach_thread_ptid_changed (infrun_thread_ptid_changed
);
5561 observer_attach_thread_stop_requested (infrun_thread_stop_requested
);
5563 /* Explicitly create without lookup, since that tries to create a
5564 value with a void typed value, and when we get here, gdbarch
5565 isn't initialized yet. At this point, we're quite sure there
5566 isn't another convenience variable of the same name. */
5567 create_internalvar_type_lazy ("_siginfo", siginfo_make_value
);