1 /* Target-struct-independent code to start (run) and stop an inferior
4 Copyright (C) 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995,
5 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007,
6 2008 Free Software Foundation, Inc.
8 This file is part of GDB.
10 This program is free software; you can redistribute it and/or modify
11 it under the terms of the GNU General Public License as published by
12 the Free Software Foundation; either version 3 of the License, or
13 (at your option) any later version.
15 This program is distributed in the hope that it will be useful,
16 but WITHOUT ANY WARRANTY; without even the implied warranty of
17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 GNU General Public License for more details.
20 You should have received a copy of the GNU General Public License
21 along with this program. If not, see <http://www.gnu.org/licenses/>. */
24 #include "gdb_string.h"
29 #include "exceptions.h"
30 #include "breakpoint.h"
34 #include "cli/cli-script.h"
36 #include "gdbthread.h"
49 #include "gdb_assert.h"
50 #include "mi/mi-common.h"
51 #include "event-top.h"
53 /* Prototypes for local functions */
55 static void signals_info (char *, int);
57 static void handle_command (char *, int);
59 static void sig_print_info (enum target_signal
);
61 static void sig_print_header (void);
63 static void resume_cleanups (void *);
65 static int hook_stop_stub (void *);
67 static int restore_selected_frame (void *);
69 static void build_infrun (void);
71 static int follow_fork (void);
73 static void set_schedlock_func (char *args
, int from_tty
,
74 struct cmd_list_element
*c
);
76 static int currently_stepping (struct thread_info
*tp
);
78 static void xdb_handle_command (char *args
, int from_tty
);
80 static int prepare_to_proceed (int);
82 void _initialize_infrun (void);
84 /* When set, stop the 'step' command if we enter a function which has
85 no line number information. The normal behavior is that we step
86 over such function. */
87 int step_stop_if_no_debug
= 0;
89 show_step_stop_if_no_debug (struct ui_file
*file
, int from_tty
,
90 struct cmd_list_element
*c
, const char *value
)
92 fprintf_filtered (file
, _("Mode of the step operation is %s.\n"), value
);
95 /* In asynchronous mode, but simulating synchronous execution. */
97 int sync_execution
= 0;
99 /* wait_for_inferior and normal_stop use this to notify the user
100 when the inferior stopped in a different thread than it had been
103 static ptid_t previous_inferior_ptid
;
105 int debug_displaced
= 0;
107 show_debug_displaced (struct ui_file
*file
, int from_tty
,
108 struct cmd_list_element
*c
, const char *value
)
110 fprintf_filtered (file
, _("Displace stepping debugging is %s.\n"), value
);
113 static int debug_infrun
= 0;
115 show_debug_infrun (struct ui_file
*file
, int from_tty
,
116 struct cmd_list_element
*c
, const char *value
)
118 fprintf_filtered (file
, _("Inferior debugging is %s.\n"), value
);
121 /* If the program uses ELF-style shared libraries, then calls to
122 functions in shared libraries go through stubs, which live in a
123 table called the PLT (Procedure Linkage Table). The first time the
124 function is called, the stub sends control to the dynamic linker,
125 which looks up the function's real address, patches the stub so
126 that future calls will go directly to the function, and then passes
127 control to the function.
129 If we are stepping at the source level, we don't want to see any of
130 this --- we just want to skip over the stub and the dynamic linker.
131 The simple approach is to single-step until control leaves the
134 However, on some systems (e.g., Red Hat's 5.2 distribution) the
135 dynamic linker calls functions in the shared C library, so you
136 can't tell from the PC alone whether the dynamic linker is still
137 running. In this case, we use a step-resume breakpoint to get us
138 past the dynamic linker, as if we were using "next" to step over a
141 in_solib_dynsym_resolve_code() says whether we're in the dynamic
142 linker code or not. Normally, this means we single-step. However,
143 if SKIP_SOLIB_RESOLVER then returns non-zero, then its value is an
144 address where we can place a step-resume breakpoint to get past the
145 linker's symbol resolution function.
147 in_solib_dynsym_resolve_code() can generally be implemented in a
148 pretty portable way, by comparing the PC against the address ranges
149 of the dynamic linker's sections.
151 SKIP_SOLIB_RESOLVER is generally going to be system-specific, since
152 it depends on internal details of the dynamic linker. It's usually
153 not too hard to figure out where to put a breakpoint, but it
154 certainly isn't portable. SKIP_SOLIB_RESOLVER should do plenty of
155 sanity checking. If it can't figure things out, returning zero and
156 getting the (possibly confusing) stepping behavior is better than
157 signalling an error, which will obscure the change in the
160 /* This function returns TRUE if pc is the address of an instruction
161 that lies within the dynamic linker (such as the event hook, or the
164 This function must be used only when a dynamic linker event has
165 been caught, and the inferior is being stepped out of the hook, or
166 undefined results are guaranteed. */
168 #ifndef SOLIB_IN_DYNAMIC_LINKER
169 #define SOLIB_IN_DYNAMIC_LINKER(pid,pc) 0
173 /* Convert the #defines into values. This is temporary until wfi control
174 flow is completely sorted out. */
176 #ifndef CANNOT_STEP_HW_WATCHPOINTS
177 #define CANNOT_STEP_HW_WATCHPOINTS 0
179 #undef CANNOT_STEP_HW_WATCHPOINTS
180 #define CANNOT_STEP_HW_WATCHPOINTS 1
183 /* Tables of how to react to signals; the user sets them. */
185 static unsigned char *signal_stop
;
186 static unsigned char *signal_print
;
187 static unsigned char *signal_program
;
189 #define SET_SIGS(nsigs,sigs,flags) \
191 int signum = (nsigs); \
192 while (signum-- > 0) \
193 if ((sigs)[signum]) \
194 (flags)[signum] = 1; \
197 #define UNSET_SIGS(nsigs,sigs,flags) \
199 int signum = (nsigs); \
200 while (signum-- > 0) \
201 if ((sigs)[signum]) \
202 (flags)[signum] = 0; \
205 /* Value to pass to target_resume() to cause all threads to resume */
207 #define RESUME_ALL (pid_to_ptid (-1))
209 /* Command list pointer for the "stop" placeholder. */
211 static struct cmd_list_element
*stop_command
;
213 /* Function inferior was in as of last step command. */
215 static struct symbol
*step_start_function
;
217 /* Nonzero if we want to give control to the user when we're notified
218 of shared library events by the dynamic linker. */
219 static int stop_on_solib_events
;
221 show_stop_on_solib_events (struct ui_file
*file
, int from_tty
,
222 struct cmd_list_element
*c
, const char *value
)
224 fprintf_filtered (file
, _("Stopping for shared library events is %s.\n"),
228 /* Nonzero means expecting a trace trap
229 and should stop the inferior and return silently when it happens. */
233 /* Nonzero means expecting a trap and caller will handle it themselves.
234 It is used after attach, due to attaching to a process;
235 when running in the shell before the child program has been exec'd;
236 and when running some kinds of remote stuff (FIXME?). */
238 enum stop_kind stop_soon
;
240 /* Save register contents here when about to pop a stack dummy frame,
241 if-and-only-if proceed_to_finish is set.
242 Thus this contains the return value from the called function (assuming
243 values are returned in a register). */
245 struct regcache
*stop_registers
;
247 /* Nonzero after stop if current stack frame should be printed. */
249 static int stop_print_frame
;
251 /* This is a cached copy of the pid/waitstatus of the last event
252 returned by target_wait()/deprecated_target_wait_hook(). This
253 information is returned by get_last_target_status(). */
254 static ptid_t target_last_wait_ptid
;
255 static struct target_waitstatus target_last_waitstatus
;
257 static void context_switch (ptid_t ptid
);
259 void init_thread_stepping_state (struct thread_info
*tss
);
261 void init_infwait_state (void);
263 /* This is used to remember when a fork, vfork or exec event
264 was caught by a catchpoint, and thus the event is to be
265 followed at the next resume of the inferior, and not
269 enum target_waitkind kind
;
276 char *execd_pathname
;
280 static const char follow_fork_mode_child
[] = "child";
281 static const char follow_fork_mode_parent
[] = "parent";
283 static const char *follow_fork_mode_kind_names
[] = {
284 follow_fork_mode_child
,
285 follow_fork_mode_parent
,
289 static const char *follow_fork_mode_string
= follow_fork_mode_parent
;
291 show_follow_fork_mode_string (struct ui_file
*file
, int from_tty
,
292 struct cmd_list_element
*c
, const char *value
)
294 fprintf_filtered (file
, _("\
295 Debugger response to a program call of fork or vfork is \"%s\".\n"),
303 int follow_child
= (follow_fork_mode_string
== follow_fork_mode_child
);
305 return target_follow_fork (follow_child
);
309 follow_inferior_reset_breakpoints (void)
311 struct thread_info
*tp
= inferior_thread ();
313 /* Was there a step_resume breakpoint? (There was if the user
314 did a "next" at the fork() call.) If so, explicitly reset its
317 step_resumes are a form of bp that are made to be per-thread.
318 Since we created the step_resume bp when the parent process
319 was being debugged, and now are switching to the child process,
320 from the breakpoint package's viewpoint, that's a switch of
321 "threads". We must update the bp's notion of which thread
322 it is for, or it'll be ignored when it triggers. */
324 if (tp
->step_resume_breakpoint
)
325 breakpoint_re_set_thread (tp
->step_resume_breakpoint
);
327 /* Reinsert all breakpoints in the child. The user may have set
328 breakpoints after catching the fork, in which case those
329 were never set in the child, but only in the parent. This makes
330 sure the inserted breakpoints match the breakpoint list. */
332 breakpoint_re_set ();
333 insert_breakpoints ();
336 /* EXECD_PATHNAME is assumed to be non-NULL. */
339 follow_exec (ptid_t pid
, char *execd_pathname
)
341 ptid_t saved_pid
= pid
;
342 struct target_ops
*tgt
;
343 struct thread_info
*th
= inferior_thread ();
345 /* This is an exec event that we actually wish to pay attention to.
346 Refresh our symbol table to the newly exec'd program, remove any
349 If there are breakpoints, they aren't really inserted now,
350 since the exec() transformed our inferior into a fresh set
353 We want to preserve symbolic breakpoints on the list, since
354 we have hopes that they can be reset after the new a.out's
355 symbol table is read.
357 However, any "raw" breakpoints must be removed from the list
358 (e.g., the solib bp's), since their address is probably invalid
361 And, we DON'T want to call delete_breakpoints() here, since
362 that may write the bp's "shadow contents" (the instruction
363 value that was overwritten witha TRAP instruction). Since
364 we now have a new a.out, those shadow contents aren't valid. */
365 update_breakpoints_after_exec ();
367 /* If there was one, it's gone now. We cannot truly step-to-next
368 statement through an exec(). */
369 th
->step_resume_breakpoint
= NULL
;
370 th
->step_range_start
= 0;
371 th
->step_range_end
= 0;
373 /* What is this a.out's name? */
374 printf_unfiltered (_("Executing new program: %s\n"), execd_pathname
);
376 /* We've followed the inferior through an exec. Therefore, the
377 inferior has essentially been killed & reborn. */
379 gdb_flush (gdb_stdout
);
380 generic_mourn_inferior ();
381 /* Because mourn_inferior resets inferior_ptid. */
382 inferior_ptid
= saved_pid
;
384 if (gdb_sysroot
&& *gdb_sysroot
)
386 char *name
= alloca (strlen (gdb_sysroot
)
387 + strlen (execd_pathname
)
389 strcpy (name
, gdb_sysroot
);
390 strcat (name
, execd_pathname
);
391 execd_pathname
= name
;
394 /* That a.out is now the one to use. */
395 exec_file_attach (execd_pathname
, 0);
397 /* Reset the shared library package. This ensures that we get a
398 shlib event when the child reaches "_start", at which point the
399 dld will have had a chance to initialize the child. */
400 /* Also, loading a symbol file below may trigger symbol lookups, and
401 we don't want those to be satisfied by the libraries of the
402 previous incarnation of this process. */
403 no_shared_libraries (NULL
, 0);
405 /* Load the main file's symbols. */
406 symbol_file_add_main (execd_pathname
, 0);
408 #ifdef SOLIB_CREATE_INFERIOR_HOOK
409 SOLIB_CREATE_INFERIOR_HOOK (PIDGET (inferior_ptid
));
411 solib_create_inferior_hook ();
414 /* Reinsert all breakpoints. (Those which were symbolic have
415 been reset to the proper address in the new a.out, thanks
416 to symbol_file_command...) */
417 insert_breakpoints ();
419 /* The next resume of this inferior should bring it to the shlib
420 startup breakpoints. (If the user had also set bp's on
421 "main" from the old (parent) process, then they'll auto-
422 matically get reset there in the new process.) */
425 /* Non-zero if we just simulating a single-step. This is needed
426 because we cannot remove the breakpoints in the inferior process
427 until after the `wait' in `wait_for_inferior'. */
428 static int singlestep_breakpoints_inserted_p
= 0;
430 /* The thread we inserted single-step breakpoints for. */
431 static ptid_t singlestep_ptid
;
433 /* PC when we started this single-step. */
434 static CORE_ADDR singlestep_pc
;
436 /* If another thread hit the singlestep breakpoint, we save the original
437 thread here so that we can resume single-stepping it later. */
438 static ptid_t saved_singlestep_ptid
;
439 static int stepping_past_singlestep_breakpoint
;
441 /* If not equal to null_ptid, this means that after stepping over breakpoint
442 is finished, we need to switch to deferred_step_ptid, and step it.
444 The use case is when one thread has hit a breakpoint, and then the user
445 has switched to another thread and issued 'step'. We need to step over
446 breakpoint in the thread which hit the breakpoint, but then continue
447 stepping the thread user has selected. */
448 static ptid_t deferred_step_ptid
;
450 /* Displaced stepping. */
452 /* In non-stop debugging mode, we must take special care to manage
453 breakpoints properly; in particular, the traditional strategy for
454 stepping a thread past a breakpoint it has hit is unsuitable.
455 'Displaced stepping' is a tactic for stepping one thread past a
456 breakpoint it has hit while ensuring that other threads running
457 concurrently will hit the breakpoint as they should.
459 The traditional way to step a thread T off a breakpoint in a
460 multi-threaded program in all-stop mode is as follows:
462 a0) Initially, all threads are stopped, and breakpoints are not
464 a1) We single-step T, leaving breakpoints uninserted.
465 a2) We insert breakpoints, and resume all threads.
467 In non-stop debugging, however, this strategy is unsuitable: we
468 don't want to have to stop all threads in the system in order to
469 continue or step T past a breakpoint. Instead, we use displaced
472 n0) Initially, T is stopped, other threads are running, and
473 breakpoints are inserted.
474 n1) We copy the instruction "under" the breakpoint to a separate
475 location, outside the main code stream, making any adjustments
476 to the instruction, register, and memory state as directed by
478 n2) We single-step T over the instruction at its new location.
479 n3) We adjust the resulting register and memory state as directed
480 by T's architecture. This includes resetting T's PC to point
481 back into the main instruction stream.
484 This approach depends on the following gdbarch methods:
486 - gdbarch_max_insn_length and gdbarch_displaced_step_location
487 indicate where to copy the instruction, and how much space must
488 be reserved there. We use these in step n1.
490 - gdbarch_displaced_step_copy_insn copies a instruction to a new
491 address, and makes any necessary adjustments to the instruction,
492 register contents, and memory. We use this in step n1.
494 - gdbarch_displaced_step_fixup adjusts registers and memory after
495 we have successfuly single-stepped the instruction, to yield the
496 same effect the instruction would have had if we had executed it
497 at its original address. We use this in step n3.
499 - gdbarch_displaced_step_free_closure provides cleanup.
501 The gdbarch_displaced_step_copy_insn and
502 gdbarch_displaced_step_fixup functions must be written so that
503 copying an instruction with gdbarch_displaced_step_copy_insn,
504 single-stepping across the copied instruction, and then applying
505 gdbarch_displaced_insn_fixup should have the same effects on the
506 thread's memory and registers as stepping the instruction in place
507 would have. Exactly which responsibilities fall to the copy and
508 which fall to the fixup is up to the author of those functions.
510 See the comments in gdbarch.sh for details.
512 Note that displaced stepping and software single-step cannot
513 currently be used in combination, although with some care I think
514 they could be made to. Software single-step works by placing
515 breakpoints on all possible subsequent instructions; if the
516 displaced instruction is a PC-relative jump, those breakpoints
517 could fall in very strange places --- on pages that aren't
518 executable, or at addresses that are not proper instruction
519 boundaries. (We do generally let other threads run while we wait
520 to hit the software single-step breakpoint, and they might
521 encounter such a corrupted instruction.) One way to work around
522 this would be to have gdbarch_displaced_step_copy_insn fully
523 simulate the effect of PC-relative instructions (and return NULL)
524 on architectures that use software single-stepping.
526 In non-stop mode, we can have independent and simultaneous step
527 requests, so more than one thread may need to simultaneously step
528 over a breakpoint. The current implementation assumes there is
529 only one scratch space per process. In this case, we have to
530 serialize access to the scratch space. If thread A wants to step
531 over a breakpoint, but we are currently waiting for some other
532 thread to complete a displaced step, we leave thread A stopped and
533 place it in the displaced_step_request_queue. Whenever a displaced
534 step finishes, we pick the next thread in the queue and start a new
535 displaced step operation on it. See displaced_step_prepare and
536 displaced_step_fixup for details. */
538 /* If this is not null_ptid, this is the thread carrying out a
539 displaced single-step. This thread's state will require fixing up
540 once it has completed its step. */
541 static ptid_t displaced_step_ptid
;
543 struct displaced_step_request
546 struct displaced_step_request
*next
;
549 /* A queue of pending displaced stepping requests. */
550 struct displaced_step_request
*displaced_step_request_queue
;
552 /* The architecture the thread had when we stepped it. */
553 static struct gdbarch
*displaced_step_gdbarch
;
555 /* The closure provided gdbarch_displaced_step_copy_insn, to be used
556 for post-step cleanup. */
557 static struct displaced_step_closure
*displaced_step_closure
;
559 /* The address of the original instruction, and the copy we made. */
560 static CORE_ADDR displaced_step_original
, displaced_step_copy
;
562 /* Saved contents of copy area. */
563 static gdb_byte
*displaced_step_saved_copy
;
565 /* When this is non-zero, we are allowed to use displaced stepping, if
566 the architecture supports it. When this is zero, we use
567 traditional the hold-and-step approach. */
568 int can_use_displaced_stepping
= 1;
570 show_can_use_displaced_stepping (struct ui_file
*file
, int from_tty
,
571 struct cmd_list_element
*c
,
574 fprintf_filtered (file
, _("\
575 Debugger's willingness to use displaced stepping to step over "
576 "breakpoints is %s.\n"), value
);
579 /* Return non-zero if displaced stepping is enabled, and can be used
582 use_displaced_stepping (struct gdbarch
*gdbarch
)
584 return (can_use_displaced_stepping
585 && gdbarch_displaced_step_copy_insn_p (gdbarch
));
588 /* Clean out any stray displaced stepping state. */
590 displaced_step_clear (void)
592 /* Indicate that there is no cleanup pending. */
593 displaced_step_ptid
= null_ptid
;
595 if (displaced_step_closure
)
597 gdbarch_displaced_step_free_closure (displaced_step_gdbarch
,
598 displaced_step_closure
);
599 displaced_step_closure
= NULL
;
604 cleanup_displaced_step_closure (void *ptr
)
606 struct displaced_step_closure
*closure
= ptr
;
608 gdbarch_displaced_step_free_closure (current_gdbarch
, closure
);
611 /* Dump LEN bytes at BUF in hex to FILE, followed by a newline. */
613 displaced_step_dump_bytes (struct ui_file
*file
,
619 for (i
= 0; i
< len
; i
++)
620 fprintf_unfiltered (file
, "%02x ", buf
[i
]);
621 fputs_unfiltered ("\n", file
);
624 /* Prepare to single-step, using displaced stepping.
626 Note that we cannot use displaced stepping when we have a signal to
627 deliver. If we have a signal to deliver and an instruction to step
628 over, then after the step, there will be no indication from the
629 target whether the thread entered a signal handler or ignored the
630 signal and stepped over the instruction successfully --- both cases
631 result in a simple SIGTRAP. In the first case we mustn't do a
632 fixup, and in the second case we must --- but we can't tell which.
633 Comments in the code for 'random signals' in handle_inferior_event
634 explain how we handle this case instead.
636 Returns 1 if preparing was successful -- this thread is going to be
637 stepped now; or 0 if displaced stepping this thread got queued. */
639 displaced_step_prepare (ptid_t ptid
)
641 struct cleanup
*old_cleanups
;
642 struct regcache
*regcache
= get_thread_regcache (ptid
);
643 struct gdbarch
*gdbarch
= get_regcache_arch (regcache
);
644 CORE_ADDR original
, copy
;
646 struct displaced_step_closure
*closure
;
648 /* We should never reach this function if the architecture does not
649 support displaced stepping. */
650 gdb_assert (gdbarch_displaced_step_copy_insn_p (gdbarch
));
652 /* For the first cut, we're displaced stepping one thread at a
655 if (!ptid_equal (displaced_step_ptid
, null_ptid
))
657 /* Already waiting for a displaced step to finish. Defer this
658 request and place in queue. */
659 struct displaced_step_request
*req
, *new_req
;
662 fprintf_unfiltered (gdb_stdlog
,
663 "displaced: defering step of %s\n",
664 target_pid_to_str (ptid
));
666 new_req
= xmalloc (sizeof (*new_req
));
667 new_req
->ptid
= ptid
;
668 new_req
->next
= NULL
;
670 if (displaced_step_request_queue
)
672 for (req
= displaced_step_request_queue
;
679 displaced_step_request_queue
= new_req
;
686 fprintf_unfiltered (gdb_stdlog
,
687 "displaced: stepping %s now\n",
688 target_pid_to_str (ptid
));
691 displaced_step_clear ();
693 original
= regcache_read_pc (regcache
);
695 copy
= gdbarch_displaced_step_location (gdbarch
);
696 len
= gdbarch_max_insn_length (gdbarch
);
698 /* Save the original contents of the copy area. */
699 displaced_step_saved_copy
= xmalloc (len
);
700 old_cleanups
= make_cleanup (free_current_contents
,
701 &displaced_step_saved_copy
);
702 read_memory (copy
, displaced_step_saved_copy
, len
);
705 fprintf_unfiltered (gdb_stdlog
, "displaced: saved 0x%s: ",
707 displaced_step_dump_bytes (gdb_stdlog
, displaced_step_saved_copy
, len
);
710 closure
= gdbarch_displaced_step_copy_insn (gdbarch
,
711 original
, copy
, regcache
);
713 /* We don't support the fully-simulated case at present. */
714 gdb_assert (closure
);
716 make_cleanup (cleanup_displaced_step_closure
, closure
);
718 /* Resume execution at the copy. */
719 regcache_write_pc (regcache
, copy
);
721 discard_cleanups (old_cleanups
);
724 fprintf_unfiltered (gdb_stdlog
, "displaced: displaced pc to 0x%s\n",
727 /* Save the information we need to fix things up if the step
729 displaced_step_ptid
= ptid
;
730 displaced_step_gdbarch
= gdbarch
;
731 displaced_step_closure
= closure
;
732 displaced_step_original
= original
;
733 displaced_step_copy
= copy
;
738 displaced_step_clear_cleanup (void *ignore
)
740 displaced_step_clear ();
744 write_memory_ptid (ptid_t ptid
, CORE_ADDR memaddr
, const gdb_byte
*myaddr
, int len
)
746 struct cleanup
*ptid_cleanup
= save_inferior_ptid ();
747 inferior_ptid
= ptid
;
748 write_memory (memaddr
, myaddr
, len
);
749 do_cleanups (ptid_cleanup
);
753 displaced_step_fixup (ptid_t event_ptid
, enum target_signal signal
)
755 struct cleanup
*old_cleanups
;
757 /* Was this event for the pid we displaced? */
758 if (ptid_equal (displaced_step_ptid
, null_ptid
)
759 || ! ptid_equal (displaced_step_ptid
, event_ptid
))
762 old_cleanups
= make_cleanup (displaced_step_clear_cleanup
, 0);
764 /* Restore the contents of the copy area. */
766 ULONGEST len
= gdbarch_max_insn_length (displaced_step_gdbarch
);
767 write_memory_ptid (displaced_step_ptid
, displaced_step_copy
,
768 displaced_step_saved_copy
, len
);
770 fprintf_unfiltered (gdb_stdlog
, "displaced: restored 0x%s\n",
771 paddr_nz (displaced_step_copy
));
774 /* Did the instruction complete successfully? */
775 if (signal
== TARGET_SIGNAL_TRAP
)
777 /* Fix up the resulting state. */
778 gdbarch_displaced_step_fixup (displaced_step_gdbarch
,
779 displaced_step_closure
,
780 displaced_step_original
,
782 get_thread_regcache (displaced_step_ptid
));
786 /* Since the instruction didn't complete, all we can do is
788 struct regcache
*regcache
= get_thread_regcache (event_ptid
);
789 CORE_ADDR pc
= regcache_read_pc (regcache
);
790 pc
= displaced_step_original
+ (pc
- displaced_step_copy
);
791 regcache_write_pc (regcache
, pc
);
794 do_cleanups (old_cleanups
);
796 /* Are there any pending displaced stepping requests? If so, run
798 if (displaced_step_request_queue
)
800 struct displaced_step_request
*head
;
803 head
= displaced_step_request_queue
;
805 displaced_step_request_queue
= head
->next
;
809 fprintf_unfiltered (gdb_stdlog
,
810 "displaced: stepping queued %s now\n",
811 target_pid_to_str (ptid
));
814 displaced_step_ptid
= null_ptid
;
815 displaced_step_prepare (ptid
);
816 target_resume (ptid
, 1, TARGET_SIGNAL_0
);
820 /* Update global variables holding ptids to hold NEW_PTID if they were
823 infrun_thread_ptid_changed (ptid_t old_ptid
, ptid_t new_ptid
)
825 struct displaced_step_request
*it
;
827 if (ptid_equal (inferior_ptid
, old_ptid
))
828 inferior_ptid
= new_ptid
;
830 if (ptid_equal (singlestep_ptid
, old_ptid
))
831 singlestep_ptid
= new_ptid
;
833 if (ptid_equal (displaced_step_ptid
, old_ptid
))
834 displaced_step_ptid
= new_ptid
;
836 if (ptid_equal (deferred_step_ptid
, old_ptid
))
837 deferred_step_ptid
= new_ptid
;
839 for (it
= displaced_step_request_queue
; it
; it
= it
->next
)
840 if (ptid_equal (it
->ptid
, old_ptid
))
847 /* Things to clean up if we QUIT out of resume (). */
849 resume_cleanups (void *ignore
)
854 static const char schedlock_off
[] = "off";
855 static const char schedlock_on
[] = "on";
856 static const char schedlock_step
[] = "step";
857 static const char *scheduler_enums
[] = {
863 static const char *scheduler_mode
= schedlock_off
;
865 show_scheduler_mode (struct ui_file
*file
, int from_tty
,
866 struct cmd_list_element
*c
, const char *value
)
868 fprintf_filtered (file
, _("\
869 Mode for locking scheduler during execution is \"%s\".\n"),
874 set_schedlock_func (char *args
, int from_tty
, struct cmd_list_element
*c
)
876 if (!target_can_lock_scheduler
)
878 scheduler_mode
= schedlock_off
;
879 error (_("Target '%s' cannot support this command."), target_shortname
);
884 /* Resume the inferior, but allow a QUIT. This is useful if the user
885 wants to interrupt some lengthy single-stepping operation
886 (for child processes, the SIGINT goes to the inferior, and so
887 we get a SIGINT random_signal, but for remote debugging and perhaps
888 other targets, that's not true).
890 STEP nonzero if we should step (zero to continue instead).
891 SIG is the signal to give the inferior (zero for none). */
893 resume (int step
, enum target_signal sig
)
895 int should_resume
= 1;
896 struct cleanup
*old_cleanups
= make_cleanup (resume_cleanups
, 0);
897 struct regcache
*regcache
= get_current_regcache ();
898 struct gdbarch
*gdbarch
= get_regcache_arch (regcache
);
899 struct thread_info
*tp
= inferior_thread ();
900 CORE_ADDR pc
= regcache_read_pc (regcache
);
904 fprintf_unfiltered (gdb_stdlog
,
905 "infrun: resume (step=%d, signal=%d), "
906 "trap_expected=%d\n",
907 step
, sig
, tp
->trap_expected
);
909 /* Some targets (e.g. Solaris x86) have a kernel bug when stepping
910 over an instruction that causes a page fault without triggering
911 a hardware watchpoint. The kernel properly notices that it shouldn't
912 stop, because the hardware watchpoint is not triggered, but it forgets
913 the step request and continues the program normally.
914 Work around the problem by removing hardware watchpoints if a step is
915 requested, GDB will check for a hardware watchpoint trigger after the
917 if (CANNOT_STEP_HW_WATCHPOINTS
&& step
)
918 remove_hw_watchpoints ();
921 /* Normally, by the time we reach `resume', the breakpoints are either
922 removed or inserted, as appropriate. The exception is if we're sitting
923 at a permanent breakpoint; we need to step over it, but permanent
924 breakpoints can't be removed. So we have to test for it here. */
925 if (breakpoint_here_p (pc
) == permanent_breakpoint_here
)
927 if (gdbarch_skip_permanent_breakpoint_p (gdbarch
))
928 gdbarch_skip_permanent_breakpoint (gdbarch
, regcache
);
931 The program is stopped at a permanent breakpoint, but GDB does not know\n\
932 how to step past a permanent breakpoint on this architecture. Try using\n\
933 a command like `return' or `jump' to continue execution."));
936 /* If enabled, step over breakpoints by executing a copy of the
937 instruction at a different address.
939 We can't use displaced stepping when we have a signal to deliver;
940 the comments for displaced_step_prepare explain why. The
941 comments in the handle_inferior event for dealing with 'random
942 signals' explain what we do instead. */
943 if (use_displaced_stepping (gdbarch
)
945 && sig
== TARGET_SIGNAL_0
)
947 if (!displaced_step_prepare (inferior_ptid
))
949 /* Got placed in displaced stepping queue. Will be resumed
950 later when all the currently queued displaced stepping
951 requests finish. The thread is not executing at this point,
952 and the call to set_executing will be made later. But we
953 need to call set_running here, since from frontend point of view,
954 the thread is running. */
955 set_running (inferior_ptid
, 1);
956 discard_cleanups (old_cleanups
);
961 if (step
&& gdbarch_software_single_step_p (gdbarch
))
963 /* Do it the hard way, w/temp breakpoints */
964 if (gdbarch_software_single_step (gdbarch
, get_current_frame ()))
966 /* ...and don't ask hardware to do it. */
968 /* and do not pull these breakpoints until after a `wait' in
969 `wait_for_inferior' */
970 singlestep_breakpoints_inserted_p
= 1;
971 singlestep_ptid
= inferior_ptid
;
976 /* If there were any forks/vforks/execs that were caught and are
977 now to be followed, then do so. */
978 switch (pending_follow
.kind
)
980 case TARGET_WAITKIND_FORKED
:
981 case TARGET_WAITKIND_VFORKED
:
982 pending_follow
.kind
= TARGET_WAITKIND_SPURIOUS
;
987 case TARGET_WAITKIND_EXECD
:
988 /* follow_exec is called as soon as the exec event is seen. */
989 pending_follow
.kind
= TARGET_WAITKIND_SPURIOUS
;
996 /* Install inferior's terminal modes. */
997 target_terminal_inferior ();
1003 resume_ptid
= RESUME_ALL
; /* Default */
1005 /* If STEP is set, it's a request to use hardware stepping
1006 facilities. But in that case, we should never
1007 use singlestep breakpoint. */
1008 gdb_assert (!(singlestep_breakpoints_inserted_p
&& step
));
1010 if (singlestep_breakpoints_inserted_p
1011 && stepping_past_singlestep_breakpoint
)
1013 /* The situation here is as follows. In thread T1 we wanted to
1014 single-step. Lacking hardware single-stepping we've
1015 set breakpoint at the PC of the next instruction -- call it
1016 P. After resuming, we've hit that breakpoint in thread T2.
1017 Now we've removed original breakpoint, inserted breakpoint
1018 at P+1, and try to step to advance T2 past breakpoint.
1019 We need to step only T2, as if T1 is allowed to freely run,
1020 it can run past P, and if other threads are allowed to run,
1021 they can hit breakpoint at P+1, and nested hits of single-step
1022 breakpoints is not something we'd want -- that's complicated
1023 to support, and has no value. */
1024 resume_ptid
= inferior_ptid
;
1027 if ((step
|| singlestep_breakpoints_inserted_p
)
1028 && tp
->trap_expected
)
1030 /* We're allowing a thread to run past a breakpoint it has
1031 hit, by single-stepping the thread with the breakpoint
1032 removed. In which case, we need to single-step only this
1033 thread, and keep others stopped, as they can miss this
1034 breakpoint if allowed to run.
1036 The current code actually removes all breakpoints when
1037 doing this, not just the one being stepped over, so if we
1038 let other threads run, we can actually miss any
1039 breakpoint, not just the one at PC. */
1040 resume_ptid
= inferior_ptid
;
1045 /* With non-stop mode on, threads are always handled
1047 resume_ptid
= inferior_ptid
;
1049 else if ((scheduler_mode
== schedlock_on
)
1050 || (scheduler_mode
== schedlock_step
1051 && (step
|| singlestep_breakpoints_inserted_p
)))
1053 /* User-settable 'scheduler' mode requires solo thread resume. */
1054 resume_ptid
= inferior_ptid
;
1057 if (gdbarch_cannot_step_breakpoint (gdbarch
))
1059 /* Most targets can step a breakpoint instruction, thus
1060 executing it normally. But if this one cannot, just
1061 continue and we will hit it anyway. */
1062 if (step
&& breakpoint_inserted_here_p (pc
))
1067 && use_displaced_stepping (gdbarch
)
1068 && tp
->trap_expected
)
1070 struct regcache
*resume_regcache
= get_thread_regcache (resume_ptid
);
1071 CORE_ADDR actual_pc
= regcache_read_pc (resume_regcache
);
1074 fprintf_unfiltered (gdb_stdlog
, "displaced: run 0x%s: ",
1075 paddr_nz (actual_pc
));
1076 read_memory (actual_pc
, buf
, sizeof (buf
));
1077 displaced_step_dump_bytes (gdb_stdlog
, buf
, sizeof (buf
));
1080 target_resume (resume_ptid
, step
, sig
);
1083 discard_cleanups (old_cleanups
);
1088 /* Clear out all variables saying what to do when inferior is continued.
1089 First do this, then set the ones you want, then call `proceed'. */
1092 clear_proceed_status (void)
1094 if (!ptid_equal (inferior_ptid
, null_ptid
))
1096 struct thread_info
*tp
= inferior_thread ();
1098 tp
->trap_expected
= 0;
1099 tp
->step_range_start
= 0;
1100 tp
->step_range_end
= 0;
1101 tp
->step_frame_id
= null_frame_id
;
1102 tp
->step_over_calls
= STEP_OVER_UNDEBUGGABLE
;
1104 tp
->proceed_to_finish
= 0;
1106 /* Discard any remaining commands or status from previous
1108 bpstat_clear (&tp
->stop_bpstat
);
1111 stop_after_trap
= 0;
1112 stop_soon
= NO_STOP_QUIETLY
;
1113 breakpoint_proceeded
= 1; /* We're about to proceed... */
1117 regcache_xfree (stop_registers
);
1118 stop_registers
= NULL
;
1122 /* This should be suitable for any targets that support threads. */
1125 prepare_to_proceed (int step
)
1128 struct target_waitstatus wait_status
;
1130 /* Get the last target status returned by target_wait(). */
1131 get_last_target_status (&wait_ptid
, &wait_status
);
1133 /* Make sure we were stopped at a breakpoint. */
1134 if (wait_status
.kind
!= TARGET_WAITKIND_STOPPED
1135 || wait_status
.value
.sig
!= TARGET_SIGNAL_TRAP
)
1140 /* Switched over from WAIT_PID. */
1141 if (!ptid_equal (wait_ptid
, minus_one_ptid
)
1142 && !ptid_equal (inferior_ptid
, wait_ptid
))
1144 struct regcache
*regcache
= get_thread_regcache (wait_ptid
);
1146 if (breakpoint_here_p (regcache_read_pc (regcache
)))
1148 /* If stepping, remember current thread to switch back to. */
1150 deferred_step_ptid
= inferior_ptid
;
1152 /* Switch back to WAIT_PID thread. */
1153 switch_to_thread (wait_ptid
);
1155 /* We return 1 to indicate that there is a breakpoint here,
1156 so we need to step over it before continuing to avoid
1157 hitting it straight away. */
1165 /* Basic routine for continuing the program in various fashions.
1167 ADDR is the address to resume at, or -1 for resume where stopped.
1168 SIGGNAL is the signal to give it, or 0 for none,
1169 or -1 for act according to how it stopped.
1170 STEP is nonzero if should trap after one instruction.
1171 -1 means return after that and print nothing.
1172 You should probably set various step_... variables
1173 before calling here, if you are stepping.
1175 You should call clear_proceed_status before calling proceed. */
1178 proceed (CORE_ADDR addr
, enum target_signal siggnal
, int step
)
1180 struct regcache
*regcache
= get_current_regcache ();
1181 struct gdbarch
*gdbarch
= get_regcache_arch (regcache
);
1182 struct thread_info
*tp
;
1183 CORE_ADDR pc
= regcache_read_pc (regcache
);
1187 step_start_function
= find_pc_function (pc
);
1189 stop_after_trap
= 1;
1191 if (addr
== (CORE_ADDR
) -1)
1193 if (pc
== stop_pc
&& breakpoint_here_p (pc
))
1194 /* There is a breakpoint at the address we will resume at,
1195 step one instruction before inserting breakpoints so that
1196 we do not stop right away (and report a second hit at this
1199 else if (gdbarch_single_step_through_delay_p (gdbarch
)
1200 && gdbarch_single_step_through_delay (gdbarch
,
1201 get_current_frame ()))
1202 /* We stepped onto an instruction that needs to be stepped
1203 again before re-inserting the breakpoint, do so. */
1208 regcache_write_pc (regcache
, addr
);
1212 fprintf_unfiltered (gdb_stdlog
,
1213 "infrun: proceed (addr=0x%s, signal=%d, step=%d)\n",
1214 paddr_nz (addr
), siggnal
, step
);
1217 /* In non-stop, each thread is handled individually. The context
1218 must already be set to the right thread here. */
1222 /* In a multi-threaded task we may select another thread and
1223 then continue or step.
1225 But if the old thread was stopped at a breakpoint, it will
1226 immediately cause another breakpoint stop without any
1227 execution (i.e. it will report a breakpoint hit incorrectly).
1228 So we must step over it first.
1230 prepare_to_proceed checks the current thread against the
1231 thread that reported the most recent event. If a step-over
1232 is required it returns TRUE and sets the current thread to
1234 if (prepare_to_proceed (step
))
1238 /* prepare_to_proceed may change the current thread. */
1239 tp
= inferior_thread ();
1243 tp
->trap_expected
= 1;
1244 /* If displaced stepping is enabled, we can step over the
1245 breakpoint without hitting it, so leave all breakpoints
1246 inserted. Otherwise we need to disable all breakpoints, step
1247 one instruction, and then re-add them when that step is
1249 if (!use_displaced_stepping (gdbarch
))
1250 remove_breakpoints ();
1253 /* We can insert breakpoints if we're not trying to step over one,
1254 or if we are stepping over one but we're using displaced stepping
1256 if (! tp
->trap_expected
|| use_displaced_stepping (gdbarch
))
1257 insert_breakpoints ();
1259 if (siggnal
!= TARGET_SIGNAL_DEFAULT
)
1260 stop_signal
= siggnal
;
1261 /* If this signal should not be seen by program,
1262 give it zero. Used for debugging signals. */
1263 else if (!signal_program
[stop_signal
])
1264 stop_signal
= TARGET_SIGNAL_0
;
1266 annotate_starting ();
1268 /* Make sure that output from GDB appears before output from the
1270 gdb_flush (gdb_stdout
);
1272 /* Refresh prev_pc value just prior to resuming. This used to be
1273 done in stop_stepping, however, setting prev_pc there did not handle
1274 scenarios such as inferior function calls or returning from
1275 a function via the return command. In those cases, the prev_pc
1276 value was not set properly for subsequent commands. The prev_pc value
1277 is used to initialize the starting line number in the ecs. With an
1278 invalid value, the gdb next command ends up stopping at the position
1279 represented by the next line table entry past our start position.
1280 On platforms that generate one line table entry per line, this
1281 is not a problem. However, on the ia64, the compiler generates
1282 extraneous line table entries that do not increase the line number.
1283 When we issue the gdb next command on the ia64 after an inferior call
1284 or a return command, we often end up a few instructions forward, still
1285 within the original line we started.
1287 An attempt was made to have init_execution_control_state () refresh
1288 the prev_pc value before calculating the line number. This approach
1289 did not work because on platforms that use ptrace, the pc register
1290 cannot be read unless the inferior is stopped. At that point, we
1291 are not guaranteed the inferior is stopped and so the regcache_read_pc ()
1292 call can fail. Setting the prev_pc value here ensures the value is
1293 updated correctly when the inferior is stopped. */
1294 tp
->prev_pc
= regcache_read_pc (get_current_regcache ());
1296 /* Fill in with reasonable starting values. */
1297 init_thread_stepping_state (tp
);
1299 /* Reset to normal state. */
1300 init_infwait_state ();
1302 /* Resume inferior. */
1303 resume (oneproc
|| step
|| bpstat_should_step (), stop_signal
);
1305 /* Wait for it to stop (if not standalone)
1306 and in any case decode why it stopped, and act accordingly. */
1307 /* Do this only if we are not using the event loop, or if the target
1308 does not support asynchronous execution. */
1309 if (!target_can_async_p ())
1311 wait_for_inferior (0);
1317 /* Start remote-debugging of a machine over a serial link. */
1320 start_remote (int from_tty
)
1322 init_wait_for_inferior ();
1323 stop_soon
= STOP_QUIETLY_REMOTE
;
1325 /* Always go on waiting for the target, regardless of the mode. */
1326 /* FIXME: cagney/1999-09-23: At present it isn't possible to
1327 indicate to wait_for_inferior that a target should timeout if
1328 nothing is returned (instead of just blocking). Because of this,
1329 targets expecting an immediate response need to, internally, set
1330 things up so that the target_wait() is forced to eventually
1332 /* FIXME: cagney/1999-09-24: It isn't possible for target_open() to
1333 differentiate to its caller what the state of the target is after
1334 the initial open has been performed. Here we're assuming that
1335 the target has stopped. It should be possible to eventually have
1336 target_open() return to the caller an indication that the target
1337 is currently running and GDB state should be set to the same as
1338 for an async run. */
1339 wait_for_inferior (0);
1341 /* Now that the inferior has stopped, do any bookkeeping like
1342 loading shared libraries. We want to do this before normal_stop,
1343 so that the displayed frame is up to date. */
1344 post_create_inferior (¤t_target
, from_tty
);
1349 /* Initialize static vars when a new inferior begins. */
1352 init_wait_for_inferior (void)
1354 /* These are meaningless until the first time through wait_for_inferior. */
1356 breakpoint_init_inferior (inf_starting
);
1358 /* Don't confuse first call to proceed(). */
1359 stop_signal
= TARGET_SIGNAL_0
;
1361 /* The first resume is not following a fork/vfork/exec. */
1362 pending_follow
.kind
= TARGET_WAITKIND_SPURIOUS
; /* I.e., none. */
1364 clear_proceed_status ();
1366 stepping_past_singlestep_breakpoint
= 0;
1367 deferred_step_ptid
= null_ptid
;
1369 target_last_wait_ptid
= minus_one_ptid
;
1371 previous_inferior_ptid
= null_ptid
;
1372 init_infwait_state ();
1374 displaced_step_clear ();
1378 /* This enum encodes possible reasons for doing a target_wait, so that
1379 wfi can call target_wait in one place. (Ultimately the call will be
1380 moved out of the infinite loop entirely.) */
1384 infwait_normal_state
,
1385 infwait_thread_hop_state
,
1386 infwait_step_watch_state
,
1387 infwait_nonstep_watch_state
1390 /* Why did the inferior stop? Used to print the appropriate messages
1391 to the interface from within handle_inferior_event(). */
1392 enum inferior_stop_reason
1394 /* Step, next, nexti, stepi finished. */
1396 /* Inferior terminated by signal. */
1398 /* Inferior exited. */
1400 /* Inferior received signal, and user asked to be notified. */
1404 /* The PTID we'll do a target_wait on.*/
1407 /* Current inferior wait state. */
1408 enum infwait_states infwait_state
;
1410 /* Data to be passed around while handling an event. This data is
1411 discarded between events. */
1412 struct execution_control_state
1415 /* The thread that got the event, if this was a thread event; NULL
1417 struct thread_info
*event_thread
;
1419 struct target_waitstatus ws
;
1421 CORE_ADDR stop_func_start
;
1422 CORE_ADDR stop_func_end
;
1423 char *stop_func_name
;
1424 int new_thread_event
;
1428 void init_execution_control_state (struct execution_control_state
*ecs
);
1430 void handle_inferior_event (struct execution_control_state
*ecs
);
1432 static void step_into_function (struct execution_control_state
*ecs
);
1433 static void insert_step_resume_breakpoint_at_frame (struct frame_info
*step_frame
);
1434 static void insert_step_resume_breakpoint_at_caller (struct frame_info
*);
1435 static void insert_step_resume_breakpoint_at_sal (struct symtab_and_line sr_sal
,
1436 struct frame_id sr_id
);
1437 static void insert_longjmp_resume_breakpoint (CORE_ADDR
);
1439 static void stop_stepping (struct execution_control_state
*ecs
);
1440 static void prepare_to_wait (struct execution_control_state
*ecs
);
1441 static void keep_going (struct execution_control_state
*ecs
);
1442 static void print_stop_reason (enum inferior_stop_reason stop_reason
,
1445 /* Callback for iterate_over_threads. */
1448 delete_step_resume_breakpoint_callback (struct thread_info
*info
, void *data
)
1450 if (is_exited (info
->ptid
))
1453 delete_step_resume_breakpoint (info
);
1457 /* In all-stop, delete the step resume breakpoint of any thread that
1458 had one. In non-stop, delete the step resume breakpoint of the
1459 thread that just stopped. */
1462 delete_step_thread_step_resume_breakpoint (void)
1464 if (!target_has_execution
1465 || ptid_equal (inferior_ptid
, null_ptid
))
1466 /* If the inferior has exited, we have already deleted the step
1467 resume breakpoints out of GDB's lists. */
1472 /* If in non-stop mode, only delete the step-resume or
1473 longjmp-resume breakpoint of the thread that just stopped
1475 struct thread_info
*tp
= inferior_thread ();
1476 delete_step_resume_breakpoint (tp
);
1479 /* In all-stop mode, delete all step-resume and longjmp-resume
1480 breakpoints of any thread that had them. */
1481 iterate_over_threads (delete_step_resume_breakpoint_callback
, NULL
);
1484 /* A cleanup wrapper. */
1487 delete_step_thread_step_resume_breakpoint_cleanup (void *arg
)
1489 delete_step_thread_step_resume_breakpoint ();
1492 /* Wait for control to return from inferior to debugger.
1494 If TREAT_EXEC_AS_SIGTRAP is non-zero, then handle EXEC signals
1495 as if they were SIGTRAP signals. This can be useful during
1496 the startup sequence on some targets such as HP/UX, where
1497 we receive an EXEC event instead of the expected SIGTRAP.
1499 If inferior gets a signal, we may decide to start it up again
1500 instead of returning. That is why there is a loop in this function.
1501 When this function actually returns it means the inferior
1502 should be left stopped and GDB should read more commands. */
1505 wait_for_inferior (int treat_exec_as_sigtrap
)
1507 struct cleanup
*old_cleanups
;
1508 struct execution_control_state ecss
;
1509 struct execution_control_state
*ecs
;
1513 (gdb_stdlog
, "infrun: wait_for_inferior (treat_exec_as_sigtrap=%d)\n",
1514 treat_exec_as_sigtrap
);
1517 make_cleanup (delete_step_thread_step_resume_breakpoint_cleanup
, NULL
);
1520 memset (ecs
, 0, sizeof (*ecs
));
1522 overlay_cache_invalid
= 1;
1524 /* We'll update this if & when we switch to a new thread. */
1525 previous_inferior_ptid
= inferior_ptid
;
1527 /* We have to invalidate the registers BEFORE calling target_wait
1528 because they can be loaded from the target while in target_wait.
1529 This makes remote debugging a bit more efficient for those
1530 targets that provide critical registers as part of their normal
1531 status mechanism. */
1533 registers_changed ();
1537 if (deprecated_target_wait_hook
)
1538 ecs
->ptid
= deprecated_target_wait_hook (waiton_ptid
, &ecs
->ws
);
1540 ecs
->ptid
= target_wait (waiton_ptid
, &ecs
->ws
);
1542 ecs
->event_thread
= find_thread_pid (ecs
->ptid
);
1544 if (treat_exec_as_sigtrap
&& ecs
->ws
.kind
== TARGET_WAITKIND_EXECD
)
1546 xfree (ecs
->ws
.value
.execd_pathname
);
1547 ecs
->ws
.kind
= TARGET_WAITKIND_STOPPED
;
1548 ecs
->ws
.value
.sig
= TARGET_SIGNAL_TRAP
;
1551 /* Now figure out what to do with the result of the result. */
1552 handle_inferior_event (ecs
);
1554 if (!ecs
->wait_some_more
)
1558 do_cleanups (old_cleanups
);
1561 /* Asynchronous version of wait_for_inferior. It is called by the
1562 event loop whenever a change of state is detected on the file
1563 descriptor corresponding to the target. It can be called more than
1564 once to complete a single execution command. In such cases we need
1565 to keep the state in a global variable ECSS. If it is the last time
1566 that this function is called for a single execution command, then
1567 report to the user that the inferior has stopped, and do the
1568 necessary cleanups. */
1571 fetch_inferior_event (void *client_data
)
1573 struct execution_control_state ecss
;
1574 struct execution_control_state
*ecs
= &ecss
;
1575 struct cleanup
*old_chain
= make_cleanup (null_cleanup
, NULL
);
1576 int was_sync
= sync_execution
;
1578 memset (ecs
, 0, sizeof (*ecs
));
1580 overlay_cache_invalid
= 1;
1582 /* We can only rely on wait_for_more being correct before handling
1583 the event in all-stop, but previous_inferior_ptid isn't used in
1585 if (!ecs
->wait_some_more
)
1586 /* We'll update this if & when we switch to a new thread. */
1587 previous_inferior_ptid
= inferior_ptid
;
1590 /* In non-stop mode, the user/frontend should not notice a thread
1591 switch due to internal events. Make sure we reverse to the
1592 user selected thread and frame after handling the event and
1593 running any breakpoint commands. */
1594 make_cleanup_restore_current_thread ();
1596 /* We have to invalidate the registers BEFORE calling target_wait
1597 because they can be loaded from the target while in target_wait.
1598 This makes remote debugging a bit more efficient for those
1599 targets that provide critical registers as part of their normal
1600 status mechanism. */
1602 registers_changed ();
1604 if (deprecated_target_wait_hook
)
1606 deprecated_target_wait_hook (waiton_ptid
, &ecs
->ws
);
1608 ecs
->ptid
= target_wait (waiton_ptid
, &ecs
->ws
);
1611 && ecs
->ws
.kind
!= TARGET_WAITKIND_IGNORE
1612 && ecs
->ws
.kind
!= TARGET_WAITKIND_EXITED
1613 && ecs
->ws
.kind
!= TARGET_WAITKIND_SIGNALLED
)
1614 /* In non-stop mode, each thread is handled individually. Switch
1615 early, so the global state is set correctly for this
1617 context_switch (ecs
->ptid
);
1619 ecs
->event_thread
= find_thread_pid (ecs
->ptid
);
1621 /* Now figure out what to do with the result of the result. */
1622 handle_inferior_event (ecs
);
1624 if (!ecs
->wait_some_more
)
1626 delete_step_thread_step_resume_breakpoint ();
1628 if (stop_soon
== NO_STOP_QUIETLY
)
1631 if (step_multi
&& stop_step
)
1632 inferior_event_handler (INF_EXEC_CONTINUE
, NULL
);
1634 inferior_event_handler (INF_EXEC_COMPLETE
, NULL
);
1637 /* Revert thread and frame. */
1638 do_cleanups (old_chain
);
1640 /* If the inferior was in sync execution mode, and now isn't,
1641 restore the prompt. */
1642 if (was_sync
&& !sync_execution
)
1643 display_gdb_prompt (0);
1646 /* Prepare an execution control state for looping through a
1647 wait_for_inferior-type loop. */
1650 init_execution_control_state (struct execution_control_state
*ecs
)
1652 ecs
->random_signal
= 0;
1655 /* Clear context switchable stepping state. */
1658 init_thread_stepping_state (struct thread_info
*tss
)
1660 struct symtab_and_line sal
;
1662 tss
->stepping_over_breakpoint
= 0;
1663 tss
->step_after_step_resume_breakpoint
= 0;
1664 tss
->stepping_through_solib_after_catch
= 0;
1665 tss
->stepping_through_solib_catchpoints
= NULL
;
1667 sal
= find_pc_line (tss
->prev_pc
, 0);
1668 tss
->current_line
= sal
.line
;
1669 tss
->current_symtab
= sal
.symtab
;
1672 /* Return the cached copy of the last pid/waitstatus returned by
1673 target_wait()/deprecated_target_wait_hook(). The data is actually
1674 cached by handle_inferior_event(), which gets called immediately
1675 after target_wait()/deprecated_target_wait_hook(). */
1678 get_last_target_status (ptid_t
*ptidp
, struct target_waitstatus
*status
)
1680 *ptidp
= target_last_wait_ptid
;
1681 *status
= target_last_waitstatus
;
1685 nullify_last_target_wait_ptid (void)
1687 target_last_wait_ptid
= minus_one_ptid
;
1690 /* Switch thread contexts, maintaining "infrun state". */
1693 context_switch (ptid_t ptid
)
1695 /* Caution: it may happen that the new thread (or the old one!)
1696 is not in the thread list. In this case we must not attempt
1697 to "switch context", or we run the risk that our context may
1698 be lost. This may happen as a result of the target module
1699 mishandling thread creation. */
1703 fprintf_unfiltered (gdb_stdlog
, "infrun: Switching context from %s ",
1704 target_pid_to_str (inferior_ptid
));
1705 fprintf_unfiltered (gdb_stdlog
, "to %s\n",
1706 target_pid_to_str (ptid
));
1709 if (in_thread_list (inferior_ptid
) && in_thread_list (ptid
))
1710 { /* Perform infrun state context switch: */
1711 /* Save infrun state for the old thread. */
1712 save_infrun_state (inferior_ptid
,
1713 cmd_continuation
, intermediate_continuation
,
1718 /* Load infrun state for the new thread. */
1719 load_infrun_state (ptid
,
1720 &cmd_continuation
, &intermediate_continuation
,
1726 switch_to_thread (ptid
);
1729 /* Context switch to thread PTID. */
1731 context_switch_to (ptid_t ptid
)
1733 ptid_t current_ptid
= inferior_ptid
;
1735 /* Context switch to the new thread. */
1736 if (!ptid_equal (ptid
, inferior_ptid
))
1738 context_switch (ptid
);
1740 return current_ptid
;
1744 adjust_pc_after_break (struct execution_control_state
*ecs
)
1746 struct regcache
*regcache
;
1747 struct gdbarch
*gdbarch
;
1748 CORE_ADDR breakpoint_pc
;
1750 /* If we've hit a breakpoint, we'll normally be stopped with SIGTRAP. If
1751 we aren't, just return.
1753 We assume that waitkinds other than TARGET_WAITKIND_STOPPED are not
1754 affected by gdbarch_decr_pc_after_break. Other waitkinds which are
1755 implemented by software breakpoints should be handled through the normal
1758 NOTE drow/2004-01-31: On some targets, breakpoints may generate
1759 different signals (SIGILL or SIGEMT for instance), but it is less
1760 clear where the PC is pointing afterwards. It may not match
1761 gdbarch_decr_pc_after_break. I don't know any specific target that
1762 generates these signals at breakpoints (the code has been in GDB since at
1763 least 1992) so I can not guess how to handle them here.
1765 In earlier versions of GDB, a target with
1766 gdbarch_have_nonsteppable_watchpoint would have the PC after hitting a
1767 watchpoint affected by gdbarch_decr_pc_after_break. I haven't found any
1768 target with both of these set in GDB history, and it seems unlikely to be
1769 correct, so gdbarch_have_nonsteppable_watchpoint is not checked here. */
1771 if (ecs
->ws
.kind
!= TARGET_WAITKIND_STOPPED
)
1774 if (ecs
->ws
.value
.sig
!= TARGET_SIGNAL_TRAP
)
1777 /* If this target does not decrement the PC after breakpoints, then
1778 we have nothing to do. */
1779 regcache
= get_thread_regcache (ecs
->ptid
);
1780 gdbarch
= get_regcache_arch (regcache
);
1781 if (gdbarch_decr_pc_after_break (gdbarch
) == 0)
1784 /* Find the location where (if we've hit a breakpoint) the
1785 breakpoint would be. */
1786 breakpoint_pc
= regcache_read_pc (regcache
)
1787 - gdbarch_decr_pc_after_break (gdbarch
);
1789 /* Check whether there actually is a software breakpoint inserted
1790 at that location. */
1791 if (software_breakpoint_inserted_here_p (breakpoint_pc
))
1793 /* When using hardware single-step, a SIGTRAP is reported for both
1794 a completed single-step and a software breakpoint. Need to
1795 differentiate between the two, as the latter needs adjusting
1796 but the former does not.
1798 The SIGTRAP can be due to a completed hardware single-step only if
1799 - we didn't insert software single-step breakpoints
1800 - the thread to be examined is still the current thread
1801 - this thread is currently being stepped
1803 If any of these events did not occur, we must have stopped due
1804 to hitting a software breakpoint, and have to back up to the
1807 As a special case, we could have hardware single-stepped a
1808 software breakpoint. In this case (prev_pc == breakpoint_pc),
1809 we also need to back up to the breakpoint address. */
1811 if (singlestep_breakpoints_inserted_p
1812 || !ptid_equal (ecs
->ptid
, inferior_ptid
)
1813 || !currently_stepping (ecs
->event_thread
)
1814 || ecs
->event_thread
->prev_pc
== breakpoint_pc
)
1815 regcache_write_pc (regcache
, breakpoint_pc
);
1820 init_infwait_state (void)
1822 waiton_ptid
= pid_to_ptid (-1);
1823 infwait_state
= infwait_normal_state
;
1827 error_is_running (void)
1830 Cannot execute this command while the selected thread is running."));
1834 ensure_not_running (void)
1836 if (is_running (inferior_ptid
))
1837 error_is_running ();
1840 /* Given an execution control state that has been freshly filled in
1841 by an event from the inferior, figure out what it means and take
1842 appropriate action. */
1845 handle_inferior_event (struct execution_control_state
*ecs
)
1847 int sw_single_step_trap_p
= 0;
1848 int stopped_by_watchpoint
;
1849 int stepped_after_stopped_by_watchpoint
= 0;
1850 struct symtab_and_line stop_pc_sal
;
1852 breakpoint_retire_moribund ();
1854 /* Cache the last pid/waitstatus. */
1855 target_last_wait_ptid
= ecs
->ptid
;
1856 target_last_waitstatus
= ecs
->ws
;
1858 /* Always clear state belonging to the previous time we stopped. */
1859 stop_stack_dummy
= 0;
1861 adjust_pc_after_break (ecs
);
1863 reinit_frame_cache ();
1865 /* If it's a new process, add it to the thread database */
1867 ecs
->new_thread_event
= (!ptid_equal (ecs
->ptid
, inferior_ptid
)
1868 && !ptid_equal (ecs
->ptid
, minus_one_ptid
)
1869 && !in_thread_list (ecs
->ptid
));
1871 if (ecs
->ws
.kind
!= TARGET_WAITKIND_EXITED
1872 && ecs
->ws
.kind
!= TARGET_WAITKIND_SIGNALLED
&& ecs
->new_thread_event
)
1873 add_thread (ecs
->ptid
);
1875 if (ecs
->ws
.kind
!= TARGET_WAITKIND_IGNORE
)
1877 /* Mark the non-executing threads accordingly. */
1879 || ecs
->ws
.kind
== TARGET_WAITKIND_EXITED
1880 || ecs
->ws
.kind
== TARGET_WAITKIND_SIGNALLED
)
1881 set_executing (pid_to_ptid (-1), 0);
1883 set_executing (ecs
->ptid
, 0);
1886 switch (infwait_state
)
1888 case infwait_thread_hop_state
:
1890 fprintf_unfiltered (gdb_stdlog
, "infrun: infwait_thread_hop_state\n");
1891 /* Cancel the waiton_ptid. */
1892 waiton_ptid
= pid_to_ptid (-1);
1895 case infwait_normal_state
:
1897 fprintf_unfiltered (gdb_stdlog
, "infrun: infwait_normal_state\n");
1900 case infwait_step_watch_state
:
1902 fprintf_unfiltered (gdb_stdlog
,
1903 "infrun: infwait_step_watch_state\n");
1905 stepped_after_stopped_by_watchpoint
= 1;
1908 case infwait_nonstep_watch_state
:
1910 fprintf_unfiltered (gdb_stdlog
,
1911 "infrun: infwait_nonstep_watch_state\n");
1912 insert_breakpoints ();
1914 /* FIXME-maybe: is this cleaner than setting a flag? Does it
1915 handle things like signals arriving and other things happening
1916 in combination correctly? */
1917 stepped_after_stopped_by_watchpoint
= 1;
1921 internal_error (__FILE__
, __LINE__
, _("bad switch"));
1923 infwait_state
= infwait_normal_state
;
1925 switch (ecs
->ws
.kind
)
1927 case TARGET_WAITKIND_LOADED
:
1929 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_LOADED\n");
1930 /* Ignore gracefully during startup of the inferior, as it might
1931 be the shell which has just loaded some objects, otherwise
1932 add the symbols for the newly loaded objects. Also ignore at
1933 the beginning of an attach or remote session; we will query
1934 the full list of libraries once the connection is
1936 if (stop_soon
== NO_STOP_QUIETLY
)
1938 /* Check for any newly added shared libraries if we're
1939 supposed to be adding them automatically. Switch
1940 terminal for any messages produced by
1941 breakpoint_re_set. */
1942 target_terminal_ours_for_output ();
1943 /* NOTE: cagney/2003-11-25: Make certain that the target
1944 stack's section table is kept up-to-date. Architectures,
1945 (e.g., PPC64), use the section table to perform
1946 operations such as address => section name and hence
1947 require the table to contain all sections (including
1948 those found in shared libraries). */
1949 /* NOTE: cagney/2003-11-25: Pass current_target and not
1950 exec_ops to SOLIB_ADD. This is because current GDB is
1951 only tooled to propagate section_table changes out from
1952 the "current_target" (see target_resize_to_sections), and
1953 not up from the exec stratum. This, of course, isn't
1954 right. "infrun.c" should only interact with the
1955 exec/process stratum, instead relying on the target stack
1956 to propagate relevant changes (stop, section table
1957 changed, ...) up to other layers. */
1959 SOLIB_ADD (NULL
, 0, ¤t_target
, auto_solib_add
);
1961 solib_add (NULL
, 0, ¤t_target
, auto_solib_add
);
1963 target_terminal_inferior ();
1965 /* If requested, stop when the dynamic linker notifies
1966 gdb of events. This allows the user to get control
1967 and place breakpoints in initializer routines for
1968 dynamically loaded objects (among other things). */
1969 if (stop_on_solib_events
)
1971 stop_stepping (ecs
);
1975 /* NOTE drow/2007-05-11: This might be a good place to check
1976 for "catch load". */
1979 /* If we are skipping through a shell, or through shared library
1980 loading that we aren't interested in, resume the program. If
1981 we're running the program normally, also resume. But stop if
1982 we're attaching or setting up a remote connection. */
1983 if (stop_soon
== STOP_QUIETLY
|| stop_soon
== NO_STOP_QUIETLY
)
1985 /* Loading of shared libraries might have changed breakpoint
1986 addresses. Make sure new breakpoints are inserted. */
1987 if (stop_soon
== NO_STOP_QUIETLY
1988 && !breakpoints_always_inserted_mode ())
1989 insert_breakpoints ();
1990 resume (0, TARGET_SIGNAL_0
);
1991 prepare_to_wait (ecs
);
1997 case TARGET_WAITKIND_SPURIOUS
:
1999 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_SPURIOUS\n");
2000 resume (0, TARGET_SIGNAL_0
);
2001 prepare_to_wait (ecs
);
2004 case TARGET_WAITKIND_EXITED
:
2006 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_EXITED\n");
2007 target_terminal_ours (); /* Must do this before mourn anyway */
2008 print_stop_reason (EXITED
, ecs
->ws
.value
.integer
);
2010 /* Record the exit code in the convenience variable $_exitcode, so
2011 that the user can inspect this again later. */
2012 set_internalvar (lookup_internalvar ("_exitcode"),
2013 value_from_longest (builtin_type_int
,
2014 (LONGEST
) ecs
->ws
.value
.integer
));
2015 gdb_flush (gdb_stdout
);
2016 target_mourn_inferior ();
2017 singlestep_breakpoints_inserted_p
= 0;
2018 stop_print_frame
= 0;
2019 stop_stepping (ecs
);
2022 case TARGET_WAITKIND_SIGNALLED
:
2024 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_SIGNALLED\n");
2025 stop_print_frame
= 0;
2026 stop_signal
= ecs
->ws
.value
.sig
;
2027 target_terminal_ours (); /* Must do this before mourn anyway */
2029 /* Note: By definition of TARGET_WAITKIND_SIGNALLED, we shouldn't
2030 reach here unless the inferior is dead. However, for years
2031 target_kill() was called here, which hints that fatal signals aren't
2032 really fatal on some systems. If that's true, then some changes
2034 target_mourn_inferior ();
2036 print_stop_reason (SIGNAL_EXITED
, stop_signal
);
2037 singlestep_breakpoints_inserted_p
= 0;
2038 stop_stepping (ecs
);
2041 /* The following are the only cases in which we keep going;
2042 the above cases end in a continue or goto. */
2043 case TARGET_WAITKIND_FORKED
:
2044 case TARGET_WAITKIND_VFORKED
:
2046 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_FORKED\n");
2047 stop_signal
= TARGET_SIGNAL_TRAP
;
2048 pending_follow
.kind
= ecs
->ws
.kind
;
2050 pending_follow
.fork_event
.parent_pid
= ecs
->ptid
;
2051 pending_follow
.fork_event
.child_pid
= ecs
->ws
.value
.related_pid
;
2053 if (!ptid_equal (ecs
->ptid
, inferior_ptid
))
2055 context_switch (ecs
->ptid
);
2056 reinit_frame_cache ();
2059 stop_pc
= read_pc ();
2061 ecs
->event_thread
->stop_bpstat
= bpstat_stop_status (stop_pc
, ecs
->ptid
);
2063 ecs
->random_signal
= !bpstat_explains_signal (ecs
->event_thread
->stop_bpstat
);
2065 /* If no catchpoint triggered for this, then keep going. */
2066 if (ecs
->random_signal
)
2068 stop_signal
= TARGET_SIGNAL_0
;
2072 goto process_event_stop_test
;
2074 case TARGET_WAITKIND_EXECD
:
2076 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_EXECD\n");
2077 stop_signal
= TARGET_SIGNAL_TRAP
;
2079 pending_follow
.execd_pathname
=
2080 savestring (ecs
->ws
.value
.execd_pathname
,
2081 strlen (ecs
->ws
.value
.execd_pathname
));
2083 /* This causes the eventpoints and symbol table to be reset. Must
2084 do this now, before trying to determine whether to stop. */
2085 follow_exec (inferior_ptid
, pending_follow
.execd_pathname
);
2086 xfree (pending_follow
.execd_pathname
);
2088 stop_pc
= regcache_read_pc (get_thread_regcache (ecs
->ptid
));
2091 /* The breakpoints module may need to touch the inferior's
2092 memory. Switch to the (stopped) event ptid
2094 ptid_t saved_inferior_ptid
= inferior_ptid
;
2095 inferior_ptid
= ecs
->ptid
;
2097 ecs
->event_thread
->stop_bpstat
= bpstat_stop_status (stop_pc
, ecs
->ptid
);
2099 ecs
->random_signal
= !bpstat_explains_signal (ecs
->event_thread
->stop_bpstat
);
2100 inferior_ptid
= saved_inferior_ptid
;
2103 if (!ptid_equal (ecs
->ptid
, inferior_ptid
))
2105 context_switch (ecs
->ptid
);
2106 reinit_frame_cache ();
2109 /* If no catchpoint triggered for this, then keep going. */
2110 if (ecs
->random_signal
)
2112 stop_signal
= TARGET_SIGNAL_0
;
2116 goto process_event_stop_test
;
2118 /* Be careful not to try to gather much state about a thread
2119 that's in a syscall. It's frequently a losing proposition. */
2120 case TARGET_WAITKIND_SYSCALL_ENTRY
:
2122 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_SYSCALL_ENTRY\n");
2123 resume (0, TARGET_SIGNAL_0
);
2124 prepare_to_wait (ecs
);
2127 /* Before examining the threads further, step this thread to
2128 get it entirely out of the syscall. (We get notice of the
2129 event when the thread is just on the verge of exiting a
2130 syscall. Stepping one instruction seems to get it back
2132 case TARGET_WAITKIND_SYSCALL_RETURN
:
2134 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_SYSCALL_RETURN\n");
2135 target_resume (ecs
->ptid
, 1, TARGET_SIGNAL_0
);
2136 prepare_to_wait (ecs
);
2139 case TARGET_WAITKIND_STOPPED
:
2141 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_STOPPED\n");
2142 stop_signal
= ecs
->ws
.value
.sig
;
2145 /* We had an event in the inferior, but we are not interested
2146 in handling it at this level. The lower layers have already
2147 done what needs to be done, if anything.
2149 One of the possible circumstances for this is when the
2150 inferior produces output for the console. The inferior has
2151 not stopped, and we are ignoring the event. Another possible
2152 circumstance is any event which the lower level knows will be
2153 reported multiple times without an intervening resume. */
2154 case TARGET_WAITKIND_IGNORE
:
2156 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_IGNORE\n");
2157 prepare_to_wait (ecs
);
2161 if (ecs
->new_thread_event
)
2164 /* Non-stop assumes that the target handles adding new threads
2165 to the thread list. */
2166 internal_error (__FILE__
, __LINE__
, "\
2167 targets should add new threads to the thread list themselves in non-stop mode.");
2169 /* We may want to consider not doing a resume here in order to
2170 give the user a chance to play with the new thread. It might
2171 be good to make that a user-settable option. */
2173 /* At this point, all threads are stopped (happens automatically
2174 in either the OS or the native code). Therefore we need to
2175 continue all threads in order to make progress. */
2177 target_resume (RESUME_ALL
, 0, TARGET_SIGNAL_0
);
2178 prepare_to_wait (ecs
);
2182 /* Do we need to clean up the state of a thread that has completed a
2183 displaced single-step? (Doing so usually affects the PC, so do
2184 it here, before we set stop_pc.) */
2185 displaced_step_fixup (ecs
->ptid
, stop_signal
);
2187 stop_pc
= regcache_read_pc (get_thread_regcache (ecs
->ptid
));
2191 fprintf_unfiltered (gdb_stdlog
, "infrun: stop_pc = 0x%s\n",
2192 paddr_nz (stop_pc
));
2193 if (STOPPED_BY_WATCHPOINT (&ecs
->ws
))
2196 fprintf_unfiltered (gdb_stdlog
, "infrun: stopped by watchpoint\n");
2198 if (target_stopped_data_address (¤t_target
, &addr
))
2199 fprintf_unfiltered (gdb_stdlog
,
2200 "infrun: stopped data address = 0x%s\n",
2203 fprintf_unfiltered (gdb_stdlog
,
2204 "infrun: (no data address available)\n");
2208 if (stepping_past_singlestep_breakpoint
)
2210 gdb_assert (singlestep_breakpoints_inserted_p
);
2211 gdb_assert (ptid_equal (singlestep_ptid
, ecs
->ptid
));
2212 gdb_assert (!ptid_equal (singlestep_ptid
, saved_singlestep_ptid
));
2214 stepping_past_singlestep_breakpoint
= 0;
2216 /* We've either finished single-stepping past the single-step
2217 breakpoint, or stopped for some other reason. It would be nice if
2218 we could tell, but we can't reliably. */
2219 if (stop_signal
== TARGET_SIGNAL_TRAP
)
2222 fprintf_unfiltered (gdb_stdlog
, "infrun: stepping_past_singlestep_breakpoint\n");
2223 /* Pull the single step breakpoints out of the target. */
2224 remove_single_step_breakpoints ();
2225 singlestep_breakpoints_inserted_p
= 0;
2227 ecs
->random_signal
= 0;
2229 context_switch (saved_singlestep_ptid
);
2230 if (deprecated_context_hook
)
2231 deprecated_context_hook (pid_to_thread_id (ecs
->ptid
));
2233 resume (1, TARGET_SIGNAL_0
);
2234 prepare_to_wait (ecs
);
2239 stepping_past_singlestep_breakpoint
= 0;
2241 if (!ptid_equal (deferred_step_ptid
, null_ptid
))
2243 /* In non-stop mode, there's never a deferred_step_ptid set. */
2244 gdb_assert (!non_stop
);
2246 /* If we stopped for some other reason than single-stepping, ignore
2247 the fact that we were supposed to switch back. */
2248 if (stop_signal
== TARGET_SIGNAL_TRAP
)
2250 struct thread_info
*tp
;
2253 fprintf_unfiltered (gdb_stdlog
,
2254 "infrun: handling deferred step\n");
2256 /* Pull the single step breakpoints out of the target. */
2257 if (singlestep_breakpoints_inserted_p
)
2259 remove_single_step_breakpoints ();
2260 singlestep_breakpoints_inserted_p
= 0;
2263 /* Note: We do not call context_switch at this point, as the
2264 context is already set up for stepping the original thread. */
2265 switch_to_thread (deferred_step_ptid
);
2266 deferred_step_ptid
= null_ptid
;
2267 /* Suppress spurious "Switching to ..." message. */
2268 previous_inferior_ptid
= inferior_ptid
;
2270 resume (1, TARGET_SIGNAL_0
);
2271 prepare_to_wait (ecs
);
2275 deferred_step_ptid
= null_ptid
;
2278 /* See if a thread hit a thread-specific breakpoint that was meant for
2279 another thread. If so, then step that thread past the breakpoint,
2282 if (stop_signal
== TARGET_SIGNAL_TRAP
)
2284 int thread_hop_needed
= 0;
2286 /* Check if a regular breakpoint has been hit before checking
2287 for a potential single step breakpoint. Otherwise, GDB will
2288 not see this breakpoint hit when stepping onto breakpoints. */
2289 if (regular_breakpoint_inserted_here_p (stop_pc
))
2291 ecs
->random_signal
= 0;
2292 if (!breakpoint_thread_match (stop_pc
, ecs
->ptid
))
2293 thread_hop_needed
= 1;
2295 else if (singlestep_breakpoints_inserted_p
)
2297 /* We have not context switched yet, so this should be true
2298 no matter which thread hit the singlestep breakpoint. */
2299 gdb_assert (ptid_equal (inferior_ptid
, singlestep_ptid
));
2301 fprintf_unfiltered (gdb_stdlog
, "infrun: software single step "
2303 target_pid_to_str (ecs
->ptid
));
2305 ecs
->random_signal
= 0;
2306 /* The call to in_thread_list is necessary because PTIDs sometimes
2307 change when we go from single-threaded to multi-threaded. If
2308 the singlestep_ptid is still in the list, assume that it is
2309 really different from ecs->ptid. */
2310 if (!ptid_equal (singlestep_ptid
, ecs
->ptid
)
2311 && in_thread_list (singlestep_ptid
))
2313 /* If the PC of the thread we were trying to single-step
2314 has changed, discard this event (which we were going
2315 to ignore anyway), and pretend we saw that thread
2316 trap. This prevents us continuously moving the
2317 single-step breakpoint forward, one instruction at a
2318 time. If the PC has changed, then the thread we were
2319 trying to single-step has trapped or been signalled,
2320 but the event has not been reported to GDB yet.
2322 There might be some cases where this loses signal
2323 information, if a signal has arrived at exactly the
2324 same time that the PC changed, but this is the best
2325 we can do with the information available. Perhaps we
2326 should arrange to report all events for all threads
2327 when they stop, or to re-poll the remote looking for
2328 this particular thread (i.e. temporarily enable
2331 CORE_ADDR new_singlestep_pc
2332 = regcache_read_pc (get_thread_regcache (singlestep_ptid
));
2334 if (new_singlestep_pc
!= singlestep_pc
)
2337 fprintf_unfiltered (gdb_stdlog
, "infrun: unexpected thread,"
2338 " but expected thread advanced also\n");
2340 /* The current context still belongs to
2341 singlestep_ptid. Don't swap here, since that's
2342 the context we want to use. Just fudge our
2343 state and continue. */
2344 ecs
->ptid
= singlestep_ptid
;
2345 ecs
->event_thread
= find_thread_pid (ecs
->ptid
);
2346 stop_pc
= new_singlestep_pc
;
2351 fprintf_unfiltered (gdb_stdlog
,
2352 "infrun: unexpected thread\n");
2354 thread_hop_needed
= 1;
2355 stepping_past_singlestep_breakpoint
= 1;
2356 saved_singlestep_ptid
= singlestep_ptid
;
2361 if (thread_hop_needed
)
2363 int remove_status
= 0;
2366 fprintf_unfiltered (gdb_stdlog
, "infrun: thread_hop_needed\n");
2368 /* Saw a breakpoint, but it was hit by the wrong thread.
2371 if (singlestep_breakpoints_inserted_p
)
2373 /* Pull the single step breakpoints out of the target. */
2374 remove_single_step_breakpoints ();
2375 singlestep_breakpoints_inserted_p
= 0;
2378 /* If the arch can displace step, don't remove the
2380 if (!use_displaced_stepping (current_gdbarch
))
2381 remove_status
= remove_breakpoints ();
2383 /* Did we fail to remove breakpoints? If so, try
2384 to set the PC past the bp. (There's at least
2385 one situation in which we can fail to remove
2386 the bp's: On HP-UX's that use ttrace, we can't
2387 change the address space of a vforking child
2388 process until the child exits (well, okay, not
2389 then either :-) or execs. */
2390 if (remove_status
!= 0)
2391 error (_("Cannot step over breakpoint hit in wrong thread"));
2394 if (!ptid_equal (inferior_ptid
, ecs
->ptid
))
2395 context_switch (ecs
->ptid
);
2399 /* Only need to require the next event from this
2400 thread in all-stop mode. */
2401 waiton_ptid
= ecs
->ptid
;
2402 infwait_state
= infwait_thread_hop_state
;
2405 ecs
->event_thread
->stepping_over_breakpoint
= 1;
2407 registers_changed ();
2411 else if (singlestep_breakpoints_inserted_p
)
2413 sw_single_step_trap_p
= 1;
2414 ecs
->random_signal
= 0;
2418 ecs
->random_signal
= 1;
2420 /* See if something interesting happened to the non-current thread. If
2421 so, then switch to that thread. */
2422 if (!ptid_equal (ecs
->ptid
, inferior_ptid
))
2425 fprintf_unfiltered (gdb_stdlog
, "infrun: context switch\n");
2427 context_switch (ecs
->ptid
);
2429 if (deprecated_context_hook
)
2430 deprecated_context_hook (pid_to_thread_id (ecs
->ptid
));
2433 if (singlestep_breakpoints_inserted_p
)
2435 /* Pull the single step breakpoints out of the target. */
2436 remove_single_step_breakpoints ();
2437 singlestep_breakpoints_inserted_p
= 0;
2440 if (stepped_after_stopped_by_watchpoint
)
2441 stopped_by_watchpoint
= 0;
2443 stopped_by_watchpoint
= watchpoints_triggered (&ecs
->ws
);
2445 /* If necessary, step over this watchpoint. We'll be back to display
2447 if (stopped_by_watchpoint
2448 && (HAVE_STEPPABLE_WATCHPOINT
2449 || gdbarch_have_nonsteppable_watchpoint (current_gdbarch
)))
2451 /* At this point, we are stopped at an instruction which has
2452 attempted to write to a piece of memory under control of
2453 a watchpoint. The instruction hasn't actually executed
2454 yet. If we were to evaluate the watchpoint expression
2455 now, we would get the old value, and therefore no change
2456 would seem to have occurred.
2458 In order to make watchpoints work `right', we really need
2459 to complete the memory write, and then evaluate the
2460 watchpoint expression. We do this by single-stepping the
2463 It may not be necessary to disable the watchpoint to stop over
2464 it. For example, the PA can (with some kernel cooperation)
2465 single step over a watchpoint without disabling the watchpoint.
2467 It is far more common to need to disable a watchpoint to step
2468 the inferior over it. If we have non-steppable watchpoints,
2469 we must disable the current watchpoint; it's simplest to
2470 disable all watchpoints and breakpoints. */
2472 if (!HAVE_STEPPABLE_WATCHPOINT
)
2473 remove_breakpoints ();
2474 registers_changed ();
2475 target_resume (ecs
->ptid
, 1, TARGET_SIGNAL_0
); /* Single step */
2476 waiton_ptid
= ecs
->ptid
;
2477 if (HAVE_STEPPABLE_WATCHPOINT
)
2478 infwait_state
= infwait_step_watch_state
;
2480 infwait_state
= infwait_nonstep_watch_state
;
2481 prepare_to_wait (ecs
);
2485 ecs
->stop_func_start
= 0;
2486 ecs
->stop_func_end
= 0;
2487 ecs
->stop_func_name
= 0;
2488 /* Don't care about return value; stop_func_start and stop_func_name
2489 will both be 0 if it doesn't work. */
2490 find_pc_partial_function (stop_pc
, &ecs
->stop_func_name
,
2491 &ecs
->stop_func_start
, &ecs
->stop_func_end
);
2492 ecs
->stop_func_start
2493 += gdbarch_deprecated_function_start_offset (current_gdbarch
);
2494 ecs
->event_thread
->stepping_over_breakpoint
= 0;
2495 bpstat_clear (&ecs
->event_thread
->stop_bpstat
);
2497 stop_print_frame
= 1;
2498 ecs
->random_signal
= 0;
2499 stopped_by_random_signal
= 0;
2501 if (stop_signal
== TARGET_SIGNAL_TRAP
2502 && ecs
->event_thread
->trap_expected
2503 && gdbarch_single_step_through_delay_p (current_gdbarch
)
2504 && currently_stepping (ecs
->event_thread
))
2506 /* We're trying to step off a breakpoint. Turns out that we're
2507 also on an instruction that needs to be stepped multiple
2508 times before it's been fully executing. E.g., architectures
2509 with a delay slot. It needs to be stepped twice, once for
2510 the instruction and once for the delay slot. */
2511 int step_through_delay
2512 = gdbarch_single_step_through_delay (current_gdbarch
,
2513 get_current_frame ());
2514 if (debug_infrun
&& step_through_delay
)
2515 fprintf_unfiltered (gdb_stdlog
, "infrun: step through delay\n");
2516 if (ecs
->event_thread
->step_range_end
== 0 && step_through_delay
)
2518 /* The user issued a continue when stopped at a breakpoint.
2519 Set up for another trap and get out of here. */
2520 ecs
->event_thread
->stepping_over_breakpoint
= 1;
2524 else if (step_through_delay
)
2526 /* The user issued a step when stopped at a breakpoint.
2527 Maybe we should stop, maybe we should not - the delay
2528 slot *might* correspond to a line of source. In any
2529 case, don't decide that here, just set
2530 ecs->stepping_over_breakpoint, making sure we
2531 single-step again before breakpoints are re-inserted. */
2532 ecs
->event_thread
->stepping_over_breakpoint
= 1;
2536 /* Look at the cause of the stop, and decide what to do.
2537 The alternatives are:
2538 1) stop_stepping and return; to really stop and return to the debugger,
2539 2) keep_going and return to start up again
2540 (set ecs->event_thread->stepping_over_breakpoint to 1 to single step once)
2541 3) set ecs->random_signal to 1, and the decision between 1 and 2
2542 will be made according to the signal handling tables. */
2544 /* First, distinguish signals caused by the debugger from signals
2545 that have to do with the program's own actions. Note that
2546 breakpoint insns may cause SIGTRAP or SIGILL or SIGEMT, depending
2547 on the operating system version. Here we detect when a SIGILL or
2548 SIGEMT is really a breakpoint and change it to SIGTRAP. We do
2549 something similar for SIGSEGV, since a SIGSEGV will be generated
2550 when we're trying to execute a breakpoint instruction on a
2551 non-executable stack. This happens for call dummy breakpoints
2552 for architectures like SPARC that place call dummies on the
2555 If we're doing a displaced step past a breakpoint, then the
2556 breakpoint is always inserted at the original instruction;
2557 non-standard signals can't be explained by the breakpoint. */
2558 if (stop_signal
== TARGET_SIGNAL_TRAP
2559 || (! ecs
->event_thread
->trap_expected
2560 && breakpoint_inserted_here_p (stop_pc
)
2561 && (stop_signal
== TARGET_SIGNAL_ILL
2562 || stop_signal
== TARGET_SIGNAL_SEGV
2563 || stop_signal
== TARGET_SIGNAL_EMT
))
2564 || stop_soon
== STOP_QUIETLY
|| stop_soon
== STOP_QUIETLY_NO_SIGSTOP
2565 || stop_soon
== STOP_QUIETLY_REMOTE
)
2567 if (stop_signal
== TARGET_SIGNAL_TRAP
&& stop_after_trap
)
2570 fprintf_unfiltered (gdb_stdlog
, "infrun: stopped\n");
2571 stop_print_frame
= 0;
2572 stop_stepping (ecs
);
2576 /* This is originated from start_remote(), start_inferior() and
2577 shared libraries hook functions. */
2578 if (stop_soon
== STOP_QUIETLY
|| stop_soon
== STOP_QUIETLY_REMOTE
)
2581 fprintf_unfiltered (gdb_stdlog
, "infrun: quietly stopped\n");
2582 stop_stepping (ecs
);
2586 /* This originates from attach_command(). We need to overwrite
2587 the stop_signal here, because some kernels don't ignore a
2588 SIGSTOP in a subsequent ptrace(PTRACE_CONT,SIGSTOP) call.
2589 See more comments in inferior.h. On the other hand, if we
2590 get a non-SIGSTOP, report it to the user - assume the backend
2591 will handle the SIGSTOP if it should show up later.
2593 Also consider that the attach is complete when we see a
2594 SIGTRAP. Some systems (e.g. Windows), and stubs supporting
2595 target extended-remote report it instead of a SIGSTOP
2596 (e.g. gdbserver). We already rely on SIGTRAP being our
2597 signal, so this is no exception. */
2598 if (stop_soon
== STOP_QUIETLY_NO_SIGSTOP
2599 && (stop_signal
== TARGET_SIGNAL_STOP
2600 || stop_signal
== TARGET_SIGNAL_TRAP
))
2602 stop_stepping (ecs
);
2603 stop_signal
= TARGET_SIGNAL_0
;
2607 /* See if there is a breakpoint at the current PC. */
2608 ecs
->event_thread
->stop_bpstat
= bpstat_stop_status (stop_pc
, ecs
->ptid
);
2610 /* Following in case break condition called a
2612 stop_print_frame
= 1;
2614 /* NOTE: cagney/2003-03-29: These two checks for a random signal
2615 at one stage in the past included checks for an inferior
2616 function call's call dummy's return breakpoint. The original
2617 comment, that went with the test, read:
2619 ``End of a stack dummy. Some systems (e.g. Sony news) give
2620 another signal besides SIGTRAP, so check here as well as
2623 If someone ever tries to get get call dummys on a
2624 non-executable stack to work (where the target would stop
2625 with something like a SIGSEGV), then those tests might need
2626 to be re-instated. Given, however, that the tests were only
2627 enabled when momentary breakpoints were not being used, I
2628 suspect that it won't be the case.
2630 NOTE: kettenis/2004-02-05: Indeed such checks don't seem to
2631 be necessary for call dummies on a non-executable stack on
2634 if (stop_signal
== TARGET_SIGNAL_TRAP
)
2636 = !(bpstat_explains_signal (ecs
->event_thread
->stop_bpstat
)
2637 || ecs
->event_thread
->trap_expected
2638 || (ecs
->event_thread
->step_range_end
2639 && ecs
->event_thread
->step_resume_breakpoint
== NULL
));
2642 ecs
->random_signal
= !bpstat_explains_signal (ecs
->event_thread
->stop_bpstat
);
2643 if (!ecs
->random_signal
)
2644 stop_signal
= TARGET_SIGNAL_TRAP
;
2648 /* When we reach this point, we've pretty much decided
2649 that the reason for stopping must've been a random
2650 (unexpected) signal. */
2653 ecs
->random_signal
= 1;
2655 process_event_stop_test
:
2656 /* For the program's own signals, act according to
2657 the signal handling tables. */
2659 if (ecs
->random_signal
)
2661 /* Signal not for debugging purposes. */
2665 fprintf_unfiltered (gdb_stdlog
, "infrun: random signal %d\n", stop_signal
);
2667 stopped_by_random_signal
= 1;
2669 if (signal_print
[stop_signal
])
2672 target_terminal_ours_for_output ();
2673 print_stop_reason (SIGNAL_RECEIVED
, stop_signal
);
2675 if (signal_stop_state (stop_signal
))
2677 stop_stepping (ecs
);
2680 /* If not going to stop, give terminal back
2681 if we took it away. */
2683 target_terminal_inferior ();
2685 /* Clear the signal if it should not be passed. */
2686 if (signal_program
[stop_signal
] == 0)
2687 stop_signal
= TARGET_SIGNAL_0
;
2689 if (ecs
->event_thread
->prev_pc
== read_pc ()
2690 && ecs
->event_thread
->trap_expected
2691 && ecs
->event_thread
->step_resume_breakpoint
== NULL
)
2693 /* We were just starting a new sequence, attempting to
2694 single-step off of a breakpoint and expecting a SIGTRAP.
2695 Instead this signal arrives. This signal will take us out
2696 of the stepping range so GDB needs to remember to, when
2697 the signal handler returns, resume stepping off that
2699 /* To simplify things, "continue" is forced to use the same
2700 code paths as single-step - set a breakpoint at the
2701 signal return address and then, once hit, step off that
2704 fprintf_unfiltered (gdb_stdlog
,
2705 "infrun: signal arrived while stepping over "
2708 insert_step_resume_breakpoint_at_frame (get_current_frame ());
2709 ecs
->event_thread
->step_after_step_resume_breakpoint
= 1;
2714 if (ecs
->event_thread
->step_range_end
!= 0
2715 && stop_signal
!= TARGET_SIGNAL_0
2716 && (ecs
->event_thread
->step_range_start
<= stop_pc
2717 && stop_pc
< ecs
->event_thread
->step_range_end
)
2718 && frame_id_eq (get_frame_id (get_current_frame ()),
2719 ecs
->event_thread
->step_frame_id
)
2720 && ecs
->event_thread
->step_resume_breakpoint
== NULL
)
2722 /* The inferior is about to take a signal that will take it
2723 out of the single step range. Set a breakpoint at the
2724 current PC (which is presumably where the signal handler
2725 will eventually return) and then allow the inferior to
2728 Note that this is only needed for a signal delivered
2729 while in the single-step range. Nested signals aren't a
2730 problem as they eventually all return. */
2732 fprintf_unfiltered (gdb_stdlog
,
2733 "infrun: signal may take us out of "
2734 "single-step range\n");
2736 insert_step_resume_breakpoint_at_frame (get_current_frame ());
2741 /* Note: step_resume_breakpoint may be non-NULL. This occures
2742 when either there's a nested signal, or when there's a
2743 pending signal enabled just as the signal handler returns
2744 (leaving the inferior at the step-resume-breakpoint without
2745 actually executing it). Either way continue until the
2746 breakpoint is really hit. */
2751 /* Handle cases caused by hitting a breakpoint. */
2753 CORE_ADDR jmp_buf_pc
;
2754 struct bpstat_what what
;
2756 what
= bpstat_what (ecs
->event_thread
->stop_bpstat
);
2758 if (what
.call_dummy
)
2760 stop_stack_dummy
= 1;
2763 switch (what
.main_action
)
2765 case BPSTAT_WHAT_SET_LONGJMP_RESUME
:
2766 /* If we hit the breakpoint at longjmp while stepping, we
2767 install a momentary breakpoint at the target of the
2771 fprintf_unfiltered (gdb_stdlog
,
2772 "infrun: BPSTAT_WHAT_SET_LONGJMP_RESUME\n");
2774 ecs
->event_thread
->stepping_over_breakpoint
= 1;
2776 if (!gdbarch_get_longjmp_target_p (current_gdbarch
)
2777 || !gdbarch_get_longjmp_target (current_gdbarch
,
2778 get_current_frame (), &jmp_buf_pc
))
2781 fprintf_unfiltered (gdb_stdlog
, "\
2782 infrun: BPSTAT_WHAT_SET_LONGJMP_RESUME (!gdbarch_get_longjmp_target)\n");
2787 /* We're going to replace the current step-resume breakpoint
2788 with a longjmp-resume breakpoint. */
2789 delete_step_resume_breakpoint (ecs
->event_thread
);
2791 /* Insert a breakpoint at resume address. */
2792 insert_longjmp_resume_breakpoint (jmp_buf_pc
);
2797 case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME
:
2799 fprintf_unfiltered (gdb_stdlog
,
2800 "infrun: BPSTAT_WHAT_CLEAR_LONGJMP_RESUME\n");
2802 gdb_assert (ecs
->event_thread
->step_resume_breakpoint
!= NULL
);
2803 delete_step_resume_breakpoint (ecs
->event_thread
);
2806 print_stop_reason (END_STEPPING_RANGE
, 0);
2807 stop_stepping (ecs
);
2810 case BPSTAT_WHAT_SINGLE
:
2812 fprintf_unfiltered (gdb_stdlog
, "infrun: BPSTAT_WHAT_SINGLE\n");
2813 ecs
->event_thread
->stepping_over_breakpoint
= 1;
2814 /* Still need to check other stuff, at least the case
2815 where we are stepping and step out of the right range. */
2818 case BPSTAT_WHAT_STOP_NOISY
:
2820 fprintf_unfiltered (gdb_stdlog
, "infrun: BPSTAT_WHAT_STOP_NOISY\n");
2821 stop_print_frame
= 1;
2823 /* We are about to nuke the step_resume_breakpointt via the
2824 cleanup chain, so no need to worry about it here. */
2826 stop_stepping (ecs
);
2829 case BPSTAT_WHAT_STOP_SILENT
:
2831 fprintf_unfiltered (gdb_stdlog
, "infrun: BPSTAT_WHAT_STOP_SILENT\n");
2832 stop_print_frame
= 0;
2834 /* We are about to nuke the step_resume_breakpoin via the
2835 cleanup chain, so no need to worry about it here. */
2837 stop_stepping (ecs
);
2840 case BPSTAT_WHAT_STEP_RESUME
:
2842 fprintf_unfiltered (gdb_stdlog
, "infrun: BPSTAT_WHAT_STEP_RESUME\n");
2844 delete_step_resume_breakpoint (ecs
->event_thread
);
2845 if (ecs
->event_thread
->step_after_step_resume_breakpoint
)
2847 /* Back when the step-resume breakpoint was inserted, we
2848 were trying to single-step off a breakpoint. Go back
2850 ecs
->event_thread
->step_after_step_resume_breakpoint
= 0;
2851 ecs
->event_thread
->stepping_over_breakpoint
= 1;
2857 case BPSTAT_WHAT_CHECK_SHLIBS
:
2858 case BPSTAT_WHAT_CHECK_SHLIBS_RESUME_FROM_HOOK
:
2861 fprintf_unfiltered (gdb_stdlog
, "infrun: BPSTAT_WHAT_CHECK_SHLIBS\n");
2863 /* Check for any newly added shared libraries if we're
2864 supposed to be adding them automatically. Switch
2865 terminal for any messages produced by
2866 breakpoint_re_set. */
2867 target_terminal_ours_for_output ();
2868 /* NOTE: cagney/2003-11-25: Make certain that the target
2869 stack's section table is kept up-to-date. Architectures,
2870 (e.g., PPC64), use the section table to perform
2871 operations such as address => section name and hence
2872 require the table to contain all sections (including
2873 those found in shared libraries). */
2874 /* NOTE: cagney/2003-11-25: Pass current_target and not
2875 exec_ops to SOLIB_ADD. This is because current GDB is
2876 only tooled to propagate section_table changes out from
2877 the "current_target" (see target_resize_to_sections), and
2878 not up from the exec stratum. This, of course, isn't
2879 right. "infrun.c" should only interact with the
2880 exec/process stratum, instead relying on the target stack
2881 to propagate relevant changes (stop, section table
2882 changed, ...) up to other layers. */
2884 SOLIB_ADD (NULL
, 0, ¤t_target
, auto_solib_add
);
2886 solib_add (NULL
, 0, ¤t_target
, auto_solib_add
);
2888 target_terminal_inferior ();
2890 /* If requested, stop when the dynamic linker notifies
2891 gdb of events. This allows the user to get control
2892 and place breakpoints in initializer routines for
2893 dynamically loaded objects (among other things). */
2894 if (stop_on_solib_events
|| stop_stack_dummy
)
2896 stop_stepping (ecs
);
2900 /* If we stopped due to an explicit catchpoint, then the
2901 (see above) call to SOLIB_ADD pulled in any symbols
2902 from a newly-loaded library, if appropriate.
2904 We do want the inferior to stop, but not where it is
2905 now, which is in the dynamic linker callback. Rather,
2906 we would like it stop in the user's program, just after
2907 the call that caused this catchpoint to trigger. That
2908 gives the user a more useful vantage from which to
2909 examine their program's state. */
2910 else if (what
.main_action
2911 == BPSTAT_WHAT_CHECK_SHLIBS_RESUME_FROM_HOOK
)
2913 /* ??rehrauer: If I could figure out how to get the
2914 right return PC from here, we could just set a temp
2915 breakpoint and resume. I'm not sure we can without
2916 cracking open the dld's shared libraries and sniffing
2917 their unwind tables and text/data ranges, and that's
2918 not a terribly portable notion.
2920 Until that time, we must step the inferior out of the
2921 dld callback, and also out of the dld itself (and any
2922 code or stubs in libdld.sl, such as "shl_load" and
2923 friends) until we reach non-dld code. At that point,
2924 we can stop stepping. */
2925 bpstat_get_triggered_catchpoints (ecs
->event_thread
->stop_bpstat
,
2928 stepping_through_solib_catchpoints
);
2929 ecs
->event_thread
->stepping_through_solib_after_catch
= 1;
2931 /* Be sure to lift all breakpoints, so the inferior does
2932 actually step past this point... */
2933 ecs
->event_thread
->stepping_over_breakpoint
= 1;
2938 /* We want to step over this breakpoint, then keep going. */
2939 ecs
->event_thread
->stepping_over_breakpoint
= 1;
2945 case BPSTAT_WHAT_LAST
:
2946 /* Not a real code, but listed here to shut up gcc -Wall. */
2948 case BPSTAT_WHAT_KEEP_CHECKING
:
2953 /* We come here if we hit a breakpoint but should not
2954 stop for it. Possibly we also were stepping
2955 and should stop for that. So fall through and
2956 test for stepping. But, if not stepping,
2959 /* Are we stepping to get the inferior out of the dynamic linker's
2960 hook (and possibly the dld itself) after catching a shlib
2962 if (ecs
->event_thread
->stepping_through_solib_after_catch
)
2964 #if defined(SOLIB_ADD)
2965 /* Have we reached our destination? If not, keep going. */
2966 if (SOLIB_IN_DYNAMIC_LINKER (PIDGET (ecs
->ptid
), stop_pc
))
2969 fprintf_unfiltered (gdb_stdlog
, "infrun: stepping in dynamic linker\n");
2970 ecs
->event_thread
->stepping_over_breakpoint
= 1;
2976 fprintf_unfiltered (gdb_stdlog
, "infrun: step past dynamic linker\n");
2977 /* Else, stop and report the catchpoint(s) whose triggering
2978 caused us to begin stepping. */
2979 ecs
->event_thread
->stepping_through_solib_after_catch
= 0;
2980 bpstat_clear (&ecs
->event_thread
->stop_bpstat
);
2981 ecs
->event_thread
->stop_bpstat
2982 = bpstat_copy (ecs
->event_thread
->stepping_through_solib_catchpoints
);
2983 bpstat_clear (&ecs
->event_thread
->stepping_through_solib_catchpoints
);
2984 stop_print_frame
= 1;
2985 stop_stepping (ecs
);
2989 if (ecs
->event_thread
->step_resume_breakpoint
)
2992 fprintf_unfiltered (gdb_stdlog
,
2993 "infrun: step-resume breakpoint is inserted\n");
2995 /* Having a step-resume breakpoint overrides anything
2996 else having to do with stepping commands until
2997 that breakpoint is reached. */
3002 if (ecs
->event_thread
->step_range_end
== 0)
3005 fprintf_unfiltered (gdb_stdlog
, "infrun: no stepping, continue\n");
3006 /* Likewise if we aren't even stepping. */
3011 /* If stepping through a line, keep going if still within it.
3013 Note that step_range_end is the address of the first instruction
3014 beyond the step range, and NOT the address of the last instruction
3016 if (stop_pc
>= ecs
->event_thread
->step_range_start
3017 && stop_pc
< ecs
->event_thread
->step_range_end
)
3020 fprintf_unfiltered (gdb_stdlog
, "infrun: stepping inside range [0x%s-0x%s]\n",
3021 paddr_nz (ecs
->event_thread
->step_range_start
),
3022 paddr_nz (ecs
->event_thread
->step_range_end
));
3027 /* We stepped out of the stepping range. */
3029 /* If we are stepping at the source level and entered the runtime
3030 loader dynamic symbol resolution code, we keep on single stepping
3031 until we exit the run time loader code and reach the callee's
3033 if (ecs
->event_thread
->step_over_calls
== STEP_OVER_UNDEBUGGABLE
3034 && in_solib_dynsym_resolve_code (stop_pc
))
3036 CORE_ADDR pc_after_resolver
=
3037 gdbarch_skip_solib_resolver (current_gdbarch
, stop_pc
);
3040 fprintf_unfiltered (gdb_stdlog
, "infrun: stepped into dynsym resolve code\n");
3042 if (pc_after_resolver
)
3044 /* Set up a step-resume breakpoint at the address
3045 indicated by SKIP_SOLIB_RESOLVER. */
3046 struct symtab_and_line sr_sal
;
3048 sr_sal
.pc
= pc_after_resolver
;
3050 insert_step_resume_breakpoint_at_sal (sr_sal
, null_frame_id
);
3057 if (ecs
->event_thread
->step_range_end
!= 1
3058 && (ecs
->event_thread
->step_over_calls
== STEP_OVER_UNDEBUGGABLE
3059 || ecs
->event_thread
->step_over_calls
== STEP_OVER_ALL
)
3060 && get_frame_type (get_current_frame ()) == SIGTRAMP_FRAME
)
3063 fprintf_unfiltered (gdb_stdlog
, "infrun: stepped into signal trampoline\n");
3064 /* The inferior, while doing a "step" or "next", has ended up in
3065 a signal trampoline (either by a signal being delivered or by
3066 the signal handler returning). Just single-step until the
3067 inferior leaves the trampoline (either by calling the handler
3073 /* Check for subroutine calls. The check for the current frame
3074 equalling the step ID is not necessary - the check of the
3075 previous frame's ID is sufficient - but it is a common case and
3076 cheaper than checking the previous frame's ID.
3078 NOTE: frame_id_eq will never report two invalid frame IDs as
3079 being equal, so to get into this block, both the current and
3080 previous frame must have valid frame IDs. */
3081 if (!frame_id_eq (get_frame_id (get_current_frame ()),
3082 ecs
->event_thread
->step_frame_id
)
3083 && frame_id_eq (frame_unwind_id (get_current_frame ()),
3084 ecs
->event_thread
->step_frame_id
))
3086 CORE_ADDR real_stop_pc
;
3089 fprintf_unfiltered (gdb_stdlog
, "infrun: stepped into subroutine\n");
3091 if ((ecs
->event_thread
->step_over_calls
== STEP_OVER_NONE
)
3092 || ((ecs
->event_thread
->step_range_end
== 1)
3093 && in_prologue (ecs
->event_thread
->prev_pc
,
3094 ecs
->stop_func_start
)))
3096 /* I presume that step_over_calls is only 0 when we're
3097 supposed to be stepping at the assembly language level
3098 ("stepi"). Just stop. */
3099 /* Also, maybe we just did a "nexti" inside a prolog, so we
3100 thought it was a subroutine call but it was not. Stop as
3103 print_stop_reason (END_STEPPING_RANGE
, 0);
3104 stop_stepping (ecs
);
3108 if (ecs
->event_thread
->step_over_calls
== STEP_OVER_ALL
)
3110 /* We're doing a "next", set a breakpoint at callee's return
3111 address (the address at which the caller will
3113 insert_step_resume_breakpoint_at_caller (get_current_frame ());
3118 /* If we are in a function call trampoline (a stub between the
3119 calling routine and the real function), locate the real
3120 function. That's what tells us (a) whether we want to step
3121 into it at all, and (b) what prologue we want to run to the
3122 end of, if we do step into it. */
3123 real_stop_pc
= skip_language_trampoline (get_current_frame (), stop_pc
);
3124 if (real_stop_pc
== 0)
3125 real_stop_pc
= gdbarch_skip_trampoline_code
3126 (current_gdbarch
, get_current_frame (), stop_pc
);
3127 if (real_stop_pc
!= 0)
3128 ecs
->stop_func_start
= real_stop_pc
;
3130 if (in_solib_dynsym_resolve_code (ecs
->stop_func_start
))
3132 struct symtab_and_line sr_sal
;
3134 sr_sal
.pc
= ecs
->stop_func_start
;
3136 insert_step_resume_breakpoint_at_sal (sr_sal
, null_frame_id
);
3141 /* If we have line number information for the function we are
3142 thinking of stepping into, step into it.
3144 If there are several symtabs at that PC (e.g. with include
3145 files), just want to know whether *any* of them have line
3146 numbers. find_pc_line handles this. */
3148 struct symtab_and_line tmp_sal
;
3150 tmp_sal
= find_pc_line (ecs
->stop_func_start
, 0);
3151 if (tmp_sal
.line
!= 0)
3153 step_into_function (ecs
);
3158 /* If we have no line number and the step-stop-if-no-debug is
3159 set, we stop the step so that the user has a chance to switch
3160 in assembly mode. */
3161 if (ecs
->event_thread
->step_over_calls
== STEP_OVER_UNDEBUGGABLE
3162 && step_stop_if_no_debug
)
3165 print_stop_reason (END_STEPPING_RANGE
, 0);
3166 stop_stepping (ecs
);
3170 /* Set a breakpoint at callee's return address (the address at
3171 which the caller will resume). */
3172 insert_step_resume_breakpoint_at_caller (get_current_frame ());
3177 /* If we're in the return path from a shared library trampoline,
3178 we want to proceed through the trampoline when stepping. */
3179 if (gdbarch_in_solib_return_trampoline (current_gdbarch
,
3180 stop_pc
, ecs
->stop_func_name
))
3182 /* Determine where this trampoline returns. */
3183 CORE_ADDR real_stop_pc
;
3184 real_stop_pc
= gdbarch_skip_trampoline_code
3185 (current_gdbarch
, get_current_frame (), stop_pc
);
3188 fprintf_unfiltered (gdb_stdlog
, "infrun: stepped into solib return tramp\n");
3190 /* Only proceed through if we know where it's going. */
3193 /* And put the step-breakpoint there and go until there. */
3194 struct symtab_and_line sr_sal
;
3196 init_sal (&sr_sal
); /* initialize to zeroes */
3197 sr_sal
.pc
= real_stop_pc
;
3198 sr_sal
.section
= find_pc_overlay (sr_sal
.pc
);
3200 /* Do not specify what the fp should be when we stop since
3201 on some machines the prologue is where the new fp value
3203 insert_step_resume_breakpoint_at_sal (sr_sal
, null_frame_id
);
3205 /* Restart without fiddling with the step ranges or
3212 stop_pc_sal
= find_pc_line (stop_pc
, 0);
3214 /* NOTE: tausq/2004-05-24: This if block used to be done before all
3215 the trampoline processing logic, however, there are some trampolines
3216 that have no names, so we should do trampoline handling first. */
3217 if (ecs
->event_thread
->step_over_calls
== STEP_OVER_UNDEBUGGABLE
3218 && ecs
->stop_func_name
== NULL
3219 && stop_pc_sal
.line
== 0)
3222 fprintf_unfiltered (gdb_stdlog
, "infrun: stepped into undebuggable function\n");
3224 /* The inferior just stepped into, or returned to, an
3225 undebuggable function (where there is no debugging information
3226 and no line number corresponding to the address where the
3227 inferior stopped). Since we want to skip this kind of code,
3228 we keep going until the inferior returns from this
3229 function - unless the user has asked us not to (via
3230 set step-mode) or we no longer know how to get back
3231 to the call site. */
3232 if (step_stop_if_no_debug
3233 || !frame_id_p (frame_unwind_id (get_current_frame ())))
3235 /* If we have no line number and the step-stop-if-no-debug
3236 is set, we stop the step so that the user has a chance to
3237 switch in assembly mode. */
3239 print_stop_reason (END_STEPPING_RANGE
, 0);
3240 stop_stepping (ecs
);
3245 /* Set a breakpoint at callee's return address (the address
3246 at which the caller will resume). */
3247 insert_step_resume_breakpoint_at_caller (get_current_frame ());
3253 if (ecs
->event_thread
->step_range_end
== 1)
3255 /* It is stepi or nexti. We always want to stop stepping after
3258 fprintf_unfiltered (gdb_stdlog
, "infrun: stepi/nexti\n");
3260 print_stop_reason (END_STEPPING_RANGE
, 0);
3261 stop_stepping (ecs
);
3265 if (stop_pc_sal
.line
== 0)
3267 /* We have no line number information. That means to stop
3268 stepping (does this always happen right after one instruction,
3269 when we do "s" in a function with no line numbers,
3270 or can this happen as a result of a return or longjmp?). */
3272 fprintf_unfiltered (gdb_stdlog
, "infrun: no line number info\n");
3274 print_stop_reason (END_STEPPING_RANGE
, 0);
3275 stop_stepping (ecs
);
3279 if ((stop_pc
== stop_pc_sal
.pc
)
3280 && (ecs
->event_thread
->current_line
!= stop_pc_sal
.line
3281 || ecs
->event_thread
->current_symtab
!= stop_pc_sal
.symtab
))
3283 /* We are at the start of a different line. So stop. Note that
3284 we don't stop if we step into the middle of a different line.
3285 That is said to make things like for (;;) statements work
3288 fprintf_unfiltered (gdb_stdlog
, "infrun: stepped to a different line\n");
3290 print_stop_reason (END_STEPPING_RANGE
, 0);
3291 stop_stepping (ecs
);
3295 /* We aren't done stepping.
3297 Optimize by setting the stepping range to the line.
3298 (We might not be in the original line, but if we entered a
3299 new line in mid-statement, we continue stepping. This makes
3300 things like for(;;) statements work better.) */
3302 ecs
->event_thread
->step_range_start
= stop_pc_sal
.pc
;
3303 ecs
->event_thread
->step_range_end
= stop_pc_sal
.end
;
3304 ecs
->event_thread
->step_frame_id
= get_frame_id (get_current_frame ());
3305 ecs
->event_thread
->current_line
= stop_pc_sal
.line
;
3306 ecs
->event_thread
->current_symtab
= stop_pc_sal
.symtab
;
3309 fprintf_unfiltered (gdb_stdlog
, "infrun: keep going\n");
3313 /* Are we in the middle of stepping? */
3316 currently_stepping (struct thread_info
*tp
)
3318 return (((tp
->step_range_end
&& tp
->step_resume_breakpoint
== NULL
)
3319 || tp
->trap_expected
)
3320 || tp
->stepping_through_solib_after_catch
3321 || bpstat_should_step ());
3324 /* Subroutine call with source code we should not step over. Do step
3325 to the first line of code in it. */
3328 step_into_function (struct execution_control_state
*ecs
)
3331 struct symtab_and_line stop_func_sal
, sr_sal
;
3333 s
= find_pc_symtab (stop_pc
);
3334 if (s
&& s
->language
!= language_asm
)
3335 ecs
->stop_func_start
= gdbarch_skip_prologue
3336 (current_gdbarch
, ecs
->stop_func_start
);
3338 stop_func_sal
= find_pc_line (ecs
->stop_func_start
, 0);
3339 /* Use the step_resume_break to step until the end of the prologue,
3340 even if that involves jumps (as it seems to on the vax under
3342 /* If the prologue ends in the middle of a source line, continue to
3343 the end of that source line (if it is still within the function).
3344 Otherwise, just go to end of prologue. */
3345 if (stop_func_sal
.end
3346 && stop_func_sal
.pc
!= ecs
->stop_func_start
3347 && stop_func_sal
.end
< ecs
->stop_func_end
)
3348 ecs
->stop_func_start
= stop_func_sal
.end
;
3350 /* Architectures which require breakpoint adjustment might not be able
3351 to place a breakpoint at the computed address. If so, the test
3352 ``ecs->stop_func_start == stop_pc'' will never succeed. Adjust
3353 ecs->stop_func_start to an address at which a breakpoint may be
3354 legitimately placed.
3356 Note: kevinb/2004-01-19: On FR-V, if this adjustment is not
3357 made, GDB will enter an infinite loop when stepping through
3358 optimized code consisting of VLIW instructions which contain
3359 subinstructions corresponding to different source lines. On
3360 FR-V, it's not permitted to place a breakpoint on any but the
3361 first subinstruction of a VLIW instruction. When a breakpoint is
3362 set, GDB will adjust the breakpoint address to the beginning of
3363 the VLIW instruction. Thus, we need to make the corresponding
3364 adjustment here when computing the stop address. */
3366 if (gdbarch_adjust_breakpoint_address_p (current_gdbarch
))
3368 ecs
->stop_func_start
3369 = gdbarch_adjust_breakpoint_address (current_gdbarch
,
3370 ecs
->stop_func_start
);
3373 if (ecs
->stop_func_start
== stop_pc
)
3375 /* We are already there: stop now. */
3377 print_stop_reason (END_STEPPING_RANGE
, 0);
3378 stop_stepping (ecs
);
3383 /* Put the step-breakpoint there and go until there. */
3384 init_sal (&sr_sal
); /* initialize to zeroes */
3385 sr_sal
.pc
= ecs
->stop_func_start
;
3386 sr_sal
.section
= find_pc_overlay (ecs
->stop_func_start
);
3388 /* Do not specify what the fp should be when we stop since on
3389 some machines the prologue is where the new fp value is
3391 insert_step_resume_breakpoint_at_sal (sr_sal
, null_frame_id
);
3393 /* And make sure stepping stops right away then. */
3394 ecs
->event_thread
->step_range_end
= ecs
->event_thread
->step_range_start
;
3399 /* Insert a "step-resume breakpoint" at SR_SAL with frame ID SR_ID.
3400 This is used to both functions and to skip over code. */
3403 insert_step_resume_breakpoint_at_sal (struct symtab_and_line sr_sal
,
3404 struct frame_id sr_id
)
3406 /* There should never be more than one step-resume or longjmp-resume
3407 breakpoint per thread, so we should never be setting a new
3408 step_resume_breakpoint when one is already active. */
3409 gdb_assert (inferior_thread ()->step_resume_breakpoint
== NULL
);
3412 fprintf_unfiltered (gdb_stdlog
,
3413 "infrun: inserting step-resume breakpoint at 0x%s\n",
3414 paddr_nz (sr_sal
.pc
));
3416 inferior_thread ()->step_resume_breakpoint
3417 = set_momentary_breakpoint (sr_sal
, sr_id
, bp_step_resume
);
3420 /* Insert a "step-resume breakpoint" at RETURN_FRAME.pc. This is used
3421 to skip a potential signal handler.
3423 This is called with the interrupted function's frame. The signal
3424 handler, when it returns, will resume the interrupted function at
3428 insert_step_resume_breakpoint_at_frame (struct frame_info
*return_frame
)
3430 struct symtab_and_line sr_sal
;
3432 gdb_assert (return_frame
!= NULL
);
3433 init_sal (&sr_sal
); /* initialize to zeros */
3435 sr_sal
.pc
= gdbarch_addr_bits_remove
3436 (current_gdbarch
, get_frame_pc (return_frame
));
3437 sr_sal
.section
= find_pc_overlay (sr_sal
.pc
);
3439 insert_step_resume_breakpoint_at_sal (sr_sal
, get_frame_id (return_frame
));
3442 /* Similar to insert_step_resume_breakpoint_at_frame, except
3443 but a breakpoint at the previous frame's PC. This is used to
3444 skip a function after stepping into it (for "next" or if the called
3445 function has no debugging information).
3447 The current function has almost always been reached by single
3448 stepping a call or return instruction. NEXT_FRAME belongs to the
3449 current function, and the breakpoint will be set at the caller's
3452 This is a separate function rather than reusing
3453 insert_step_resume_breakpoint_at_frame in order to avoid
3454 get_prev_frame, which may stop prematurely (see the implementation
3455 of frame_unwind_id for an example). */
3458 insert_step_resume_breakpoint_at_caller (struct frame_info
*next_frame
)
3460 struct symtab_and_line sr_sal
;
3462 /* We shouldn't have gotten here if we don't know where the call site
3464 gdb_assert (frame_id_p (frame_unwind_id (next_frame
)));
3466 init_sal (&sr_sal
); /* initialize to zeros */
3468 sr_sal
.pc
= gdbarch_addr_bits_remove
3469 (current_gdbarch
, frame_pc_unwind (next_frame
));
3470 sr_sal
.section
= find_pc_overlay (sr_sal
.pc
);
3472 insert_step_resume_breakpoint_at_sal (sr_sal
, frame_unwind_id (next_frame
));
3475 /* Insert a "longjmp-resume" breakpoint at PC. This is used to set a
3476 new breakpoint at the target of a jmp_buf. The handling of
3477 longjmp-resume uses the same mechanisms used for handling
3478 "step-resume" breakpoints. */
3481 insert_longjmp_resume_breakpoint (CORE_ADDR pc
)
3483 /* There should never be more than one step-resume or longjmp-resume
3484 breakpoint per thread, so we should never be setting a new
3485 longjmp_resume_breakpoint when one is already active. */
3486 gdb_assert (inferior_thread ()->step_resume_breakpoint
== NULL
);
3489 fprintf_unfiltered (gdb_stdlog
,
3490 "infrun: inserting longjmp-resume breakpoint at 0x%s\n",
3493 inferior_thread ()->step_resume_breakpoint
=
3494 set_momentary_breakpoint_at_pc (pc
, bp_longjmp_resume
);
3498 stop_stepping (struct execution_control_state
*ecs
)
3501 fprintf_unfiltered (gdb_stdlog
, "infrun: stop_stepping\n");
3503 /* Let callers know we don't want to wait for the inferior anymore. */
3504 ecs
->wait_some_more
= 0;
3507 /* This function handles various cases where we need to continue
3508 waiting for the inferior. */
3509 /* (Used to be the keep_going: label in the old wait_for_inferior) */
3512 keep_going (struct execution_control_state
*ecs
)
3514 /* Save the pc before execution, to compare with pc after stop. */
3515 ecs
->event_thread
->prev_pc
= read_pc (); /* Might have been DECR_AFTER_BREAK */
3517 /* If we did not do break;, it means we should keep running the
3518 inferior and not return to debugger. */
3520 if (ecs
->event_thread
->trap_expected
&& stop_signal
!= TARGET_SIGNAL_TRAP
)
3522 /* We took a signal (which we are supposed to pass through to
3523 the inferior, else we'd not get here) and we haven't yet
3524 gotten our trap. Simply continue. */
3525 resume (currently_stepping (ecs
->event_thread
), stop_signal
);
3529 /* Either the trap was not expected, but we are continuing
3530 anyway (the user asked that this signal be passed to the
3533 The signal was SIGTRAP, e.g. it was our signal, but we
3534 decided we should resume from it.
3536 We're going to run this baby now!
3538 Note that insert_breakpoints won't try to re-insert
3539 already inserted breakpoints. Therefore, we don't
3540 care if breakpoints were already inserted, or not. */
3542 if (ecs
->event_thread
->stepping_over_breakpoint
)
3544 if (! use_displaced_stepping (current_gdbarch
))
3545 /* Since we can't do a displaced step, we have to remove
3546 the breakpoint while we step it. To keep things
3547 simple, we remove them all. */
3548 remove_breakpoints ();
3552 struct gdb_exception e
;
3553 /* Stop stepping when inserting breakpoints
3555 TRY_CATCH (e
, RETURN_MASK_ERROR
)
3557 insert_breakpoints ();
3561 stop_stepping (ecs
);
3566 ecs
->event_thread
->trap_expected
= ecs
->event_thread
->stepping_over_breakpoint
;
3568 /* Do not deliver SIGNAL_TRAP (except when the user explicitly
3569 specifies that such a signal should be delivered to the
3572 Typically, this would occure when a user is debugging a
3573 target monitor on a simulator: the target monitor sets a
3574 breakpoint; the simulator encounters this break-point and
3575 halts the simulation handing control to GDB; GDB, noteing
3576 that the break-point isn't valid, returns control back to the
3577 simulator; the simulator then delivers the hardware
3578 equivalent of a SIGNAL_TRAP to the program being debugged. */
3580 if (stop_signal
== TARGET_SIGNAL_TRAP
&& !signal_program
[stop_signal
])
3581 stop_signal
= TARGET_SIGNAL_0
;
3584 resume (currently_stepping (ecs
->event_thread
), stop_signal
);
3587 prepare_to_wait (ecs
);
3590 /* This function normally comes after a resume, before
3591 handle_inferior_event exits. It takes care of any last bits of
3592 housekeeping, and sets the all-important wait_some_more flag. */
3595 prepare_to_wait (struct execution_control_state
*ecs
)
3598 fprintf_unfiltered (gdb_stdlog
, "infrun: prepare_to_wait\n");
3599 if (infwait_state
== infwait_normal_state
)
3601 overlay_cache_invalid
= 1;
3603 /* We have to invalidate the registers BEFORE calling
3604 target_wait because they can be loaded from the target while
3605 in target_wait. This makes remote debugging a bit more
3606 efficient for those targets that provide critical registers
3607 as part of their normal status mechanism. */
3609 registers_changed ();
3610 waiton_ptid
= pid_to_ptid (-1);
3612 /* This is the old end of the while loop. Let everybody know we
3613 want to wait for the inferior some more and get called again
3615 ecs
->wait_some_more
= 1;
3618 /* Print why the inferior has stopped. We always print something when
3619 the inferior exits, or receives a signal. The rest of the cases are
3620 dealt with later on in normal_stop() and print_it_typical(). Ideally
3621 there should be a call to this function from handle_inferior_event()
3622 each time stop_stepping() is called.*/
3624 print_stop_reason (enum inferior_stop_reason stop_reason
, int stop_info
)
3626 switch (stop_reason
)
3628 case END_STEPPING_RANGE
:
3629 /* We are done with a step/next/si/ni command. */
3630 /* For now print nothing. */
3631 /* Print a message only if not in the middle of doing a "step n"
3632 operation for n > 1 */
3633 if (!step_multi
|| !stop_step
)
3634 if (ui_out_is_mi_like_p (uiout
))
3637 async_reason_lookup (EXEC_ASYNC_END_STEPPING_RANGE
));
3640 /* The inferior was terminated by a signal. */
3641 annotate_signalled ();
3642 if (ui_out_is_mi_like_p (uiout
))
3645 async_reason_lookup (EXEC_ASYNC_EXITED_SIGNALLED
));
3646 ui_out_text (uiout
, "\nProgram terminated with signal ");
3647 annotate_signal_name ();
3648 ui_out_field_string (uiout
, "signal-name",
3649 target_signal_to_name (stop_info
));
3650 annotate_signal_name_end ();
3651 ui_out_text (uiout
, ", ");
3652 annotate_signal_string ();
3653 ui_out_field_string (uiout
, "signal-meaning",
3654 target_signal_to_string (stop_info
));
3655 annotate_signal_string_end ();
3656 ui_out_text (uiout
, ".\n");
3657 ui_out_text (uiout
, "The program no longer exists.\n");
3660 /* The inferior program is finished. */
3661 annotate_exited (stop_info
);
3664 if (ui_out_is_mi_like_p (uiout
))
3665 ui_out_field_string (uiout
, "reason",
3666 async_reason_lookup (EXEC_ASYNC_EXITED
));
3667 ui_out_text (uiout
, "\nProgram exited with code ");
3668 ui_out_field_fmt (uiout
, "exit-code", "0%o",
3669 (unsigned int) stop_info
);
3670 ui_out_text (uiout
, ".\n");
3674 if (ui_out_is_mi_like_p (uiout
))
3677 async_reason_lookup (EXEC_ASYNC_EXITED_NORMALLY
));
3678 ui_out_text (uiout
, "\nProgram exited normally.\n");
3680 /* Support the --return-child-result option. */
3681 return_child_result_value
= stop_info
;
3683 case SIGNAL_RECEIVED
:
3684 /* Signal received. The signal table tells us to print about
3687 ui_out_text (uiout
, "\nProgram received signal ");
3688 annotate_signal_name ();
3689 if (ui_out_is_mi_like_p (uiout
))
3691 (uiout
, "reason", async_reason_lookup (EXEC_ASYNC_SIGNAL_RECEIVED
));
3692 ui_out_field_string (uiout
, "signal-name",
3693 target_signal_to_name (stop_info
));
3694 annotate_signal_name_end ();
3695 ui_out_text (uiout
, ", ");
3696 annotate_signal_string ();
3697 ui_out_field_string (uiout
, "signal-meaning",
3698 target_signal_to_string (stop_info
));
3699 annotate_signal_string_end ();
3700 ui_out_text (uiout
, ".\n");
3703 internal_error (__FILE__
, __LINE__
,
3704 _("print_stop_reason: unrecognized enum value"));
3710 /* Here to return control to GDB when the inferior stops for real.
3711 Print appropriate messages, remove breakpoints, give terminal our modes.
3713 STOP_PRINT_FRAME nonzero means print the executing frame
3714 (pc, function, args, file, line number and line text).
3715 BREAKPOINTS_FAILED nonzero means stop was due to error
3716 attempting to insert breakpoints. */
3721 struct target_waitstatus last
;
3724 get_last_target_status (&last_ptid
, &last
);
3726 /* In non-stop mode, we don't want GDB to switch threads behind the
3727 user's back, to avoid races where the user is typing a command to
3728 apply to thread x, but GDB switches to thread y before the user
3729 finishes entering the command. */
3731 /* As with the notification of thread events, we want to delay
3732 notifying the user that we've switched thread context until
3733 the inferior actually stops.
3735 There's no point in saying anything if the inferior has exited.
3736 Note that SIGNALLED here means "exited with a signal", not
3737 "received a signal". */
3739 && !ptid_equal (previous_inferior_ptid
, inferior_ptid
)
3740 && target_has_execution
3741 && last
.kind
!= TARGET_WAITKIND_SIGNALLED
3742 && last
.kind
!= TARGET_WAITKIND_EXITED
)
3744 target_terminal_ours_for_output ();
3745 printf_filtered (_("[Switching to %s]\n"),
3746 target_pid_to_str (inferior_ptid
));
3747 annotate_thread_changed ();
3748 previous_inferior_ptid
= inferior_ptid
;
3751 /* NOTE drow/2004-01-17: Is this still necessary? */
3752 /* Make sure that the current_frame's pc is correct. This
3753 is a correction for setting up the frame info before doing
3754 gdbarch_decr_pc_after_break */
3755 if (target_has_execution
)
3756 /* FIXME: cagney/2002-12-06: Has the PC changed? Thanks to
3757 gdbarch_decr_pc_after_break, the program counter can change. Ask the
3758 frame code to check for this and sort out any resultant mess.
3759 gdbarch_decr_pc_after_break needs to just go away. */
3760 deprecated_update_frame_pc_hack (get_current_frame (), read_pc ());
3762 if (!breakpoints_always_inserted_mode () && target_has_execution
)
3764 if (remove_breakpoints ())
3766 target_terminal_ours_for_output ();
3767 printf_filtered (_("\
3768 Cannot remove breakpoints because program is no longer writable.\n\
3769 It might be running in another process.\n\
3770 Further execution is probably impossible.\n"));
3774 /* If an auto-display called a function and that got a signal,
3775 delete that auto-display to avoid an infinite recursion. */
3777 if (stopped_by_random_signal
)
3778 disable_current_display ();
3780 /* Don't print a message if in the middle of doing a "step n"
3781 operation for n > 1 */
3782 if (step_multi
&& stop_step
)
3785 target_terminal_ours ();
3787 /* Set the current source location. This will also happen if we
3788 display the frame below, but the current SAL will be incorrect
3789 during a user hook-stop function. */
3790 if (target_has_stack
&& !stop_stack_dummy
)
3791 set_current_sal_from_frame (get_current_frame (), 1);
3793 /* Look up the hook_stop and run it (CLI internally handles problem
3794 of stop_command's pre-hook not existing). */
3796 catch_errors (hook_stop_stub
, stop_command
,
3797 "Error while running hook_stop:\n", RETURN_MASK_ALL
);
3799 if (!target_has_stack
)
3805 if (last
.kind
== TARGET_WAITKIND_SIGNALLED
3806 || last
.kind
== TARGET_WAITKIND_EXITED
)
3809 /* Select innermost stack frame - i.e., current frame is frame 0,
3810 and current location is based on that.
3811 Don't do this on return from a stack dummy routine,
3812 or if the program has exited. */
3814 if (!stop_stack_dummy
)
3816 select_frame (get_current_frame ());
3818 /* Print current location without a level number, if
3819 we have changed functions or hit a breakpoint.
3820 Print source line if we have one.
3821 bpstat_print() contains the logic deciding in detail
3822 what to print, based on the event(s) that just occurred. */
3824 /* If --batch-silent is enabled then there's no need to print the current
3825 source location, and to try risks causing an error message about
3826 missing source files. */
3827 if (stop_print_frame
&& !batch_silent
)
3831 int do_frame_printing
= 1;
3832 struct thread_info
*tp
= inferior_thread ();
3834 bpstat_ret
= bpstat_print (tp
->stop_bpstat
);
3838 /* If we had hit a shared library event breakpoint,
3839 bpstat_print would print out this message. If we hit
3840 an OS-level shared library event, do the same
3842 if (last
.kind
== TARGET_WAITKIND_LOADED
)
3844 printf_filtered (_("Stopped due to shared library event\n"));
3845 source_flag
= SRC_LINE
; /* something bogus */
3846 do_frame_printing
= 0;
3850 /* FIXME: cagney/2002-12-01: Given that a frame ID does
3851 (or should) carry around the function and does (or
3852 should) use that when doing a frame comparison. */
3854 && frame_id_eq (tp
->step_frame_id
,
3855 get_frame_id (get_current_frame ()))
3856 && step_start_function
== find_pc_function (stop_pc
))
3857 source_flag
= SRC_LINE
; /* finished step, just print source line */
3859 source_flag
= SRC_AND_LOC
; /* print location and source line */
3861 case PRINT_SRC_AND_LOC
:
3862 source_flag
= SRC_AND_LOC
; /* print location and source line */
3864 case PRINT_SRC_ONLY
:
3865 source_flag
= SRC_LINE
;
3868 source_flag
= SRC_LINE
; /* something bogus */
3869 do_frame_printing
= 0;
3872 internal_error (__FILE__
, __LINE__
, _("Unknown value."));
3875 if (ui_out_is_mi_like_p (uiout
))
3878 ui_out_field_int (uiout
, "thread-id",
3879 pid_to_thread_id (inferior_ptid
));
3882 struct cleanup
*back_to
= make_cleanup_ui_out_list_begin_end
3883 (uiout
, "stopped-threads");
3884 ui_out_field_int (uiout
, NULL
,
3885 pid_to_thread_id (inferior_ptid
));
3886 do_cleanups (back_to
);
3889 ui_out_field_string (uiout
, "stopped-threads", "all");
3891 /* The behavior of this routine with respect to the source
3893 SRC_LINE: Print only source line
3894 LOCATION: Print only location
3895 SRC_AND_LOC: Print location and source line */
3896 if (do_frame_printing
)
3897 print_stack_frame (get_selected_frame (NULL
), 0, source_flag
);
3899 /* Display the auto-display expressions. */
3904 /* Save the function value return registers, if we care.
3905 We might be about to restore their previous contents. */
3906 if (inferior_thread ()->proceed_to_finish
)
3908 /* This should not be necessary. */
3910 regcache_xfree (stop_registers
);
3912 /* NB: The copy goes through to the target picking up the value of
3913 all the registers. */
3914 stop_registers
= regcache_dup (get_current_regcache ());
3917 if (stop_stack_dummy
)
3919 /* Pop the empty frame that contains the stack dummy. POP_FRAME
3920 ends with a setting of the current frame, so we can use that
3922 frame_pop (get_current_frame ());
3923 /* Set stop_pc to what it was before we called the function.
3924 Can't rely on restore_inferior_status because that only gets
3925 called if we don't stop in the called function. */
3926 stop_pc
= read_pc ();
3927 select_frame (get_current_frame ());
3931 annotate_stopped ();
3932 if (!suppress_stop_observer
&& !step_multi
)
3934 if (!ptid_equal (inferior_ptid
, null_ptid
))
3935 observer_notify_normal_stop (inferior_thread ()->stop_bpstat
);
3937 observer_notify_normal_stop (NULL
);
3939 if (target_has_execution
3940 && last
.kind
!= TARGET_WAITKIND_SIGNALLED
3941 && last
.kind
!= TARGET_WAITKIND_EXITED
)
3943 /* Delete the breakpoint we stopped at, if it wants to be deleted.
3944 Delete any breakpoint that is to be deleted at the next stop. */
3945 breakpoint_auto_delete (inferior_thread ()->stop_bpstat
);
3948 set_running (pid_to_ptid (-1), 0);
3950 set_running (inferior_ptid
, 0);
3955 hook_stop_stub (void *cmd
)
3957 execute_cmd_pre_hook ((struct cmd_list_element
*) cmd
);
3962 signal_stop_state (int signo
)
3964 /* Always stop on signals if we're just gaining control of the
3966 return signal_stop
[signo
] || stop_soon
!= NO_STOP_QUIETLY
;
3970 signal_print_state (int signo
)
3972 return signal_print
[signo
];
3976 signal_pass_state (int signo
)
3978 return signal_program
[signo
];
3982 signal_stop_update (int signo
, int state
)
3984 int ret
= signal_stop
[signo
];
3985 signal_stop
[signo
] = state
;
3990 signal_print_update (int signo
, int state
)
3992 int ret
= signal_print
[signo
];
3993 signal_print
[signo
] = state
;
3998 signal_pass_update (int signo
, int state
)
4000 int ret
= signal_program
[signo
];
4001 signal_program
[signo
] = state
;
4006 sig_print_header (void)
4008 printf_filtered (_("\
4009 Signal Stop\tPrint\tPass to program\tDescription\n"));
4013 sig_print_info (enum target_signal oursig
)
4015 char *name
= target_signal_to_name (oursig
);
4016 int name_padding
= 13 - strlen (name
);
4018 if (name_padding
<= 0)
4021 printf_filtered ("%s", name
);
4022 printf_filtered ("%*.*s ", name_padding
, name_padding
, " ");
4023 printf_filtered ("%s\t", signal_stop
[oursig
] ? "Yes" : "No");
4024 printf_filtered ("%s\t", signal_print
[oursig
] ? "Yes" : "No");
4025 printf_filtered ("%s\t\t", signal_program
[oursig
] ? "Yes" : "No");
4026 printf_filtered ("%s\n", target_signal_to_string (oursig
));
4029 /* Specify how various signals in the inferior should be handled. */
4032 handle_command (char *args
, int from_tty
)
4035 int digits
, wordlen
;
4036 int sigfirst
, signum
, siglast
;
4037 enum target_signal oursig
;
4040 unsigned char *sigs
;
4041 struct cleanup
*old_chain
;
4045 error_no_arg (_("signal to handle"));
4048 /* Allocate and zero an array of flags for which signals to handle. */
4050 nsigs
= (int) TARGET_SIGNAL_LAST
;
4051 sigs
= (unsigned char *) alloca (nsigs
);
4052 memset (sigs
, 0, nsigs
);
4054 /* Break the command line up into args. */
4056 argv
= buildargv (args
);
4061 old_chain
= make_cleanup_freeargv (argv
);
4063 /* Walk through the args, looking for signal oursigs, signal names, and
4064 actions. Signal numbers and signal names may be interspersed with
4065 actions, with the actions being performed for all signals cumulatively
4066 specified. Signal ranges can be specified as <LOW>-<HIGH>. */
4068 while (*argv
!= NULL
)
4070 wordlen
= strlen (*argv
);
4071 for (digits
= 0; isdigit ((*argv
)[digits
]); digits
++)
4075 sigfirst
= siglast
= -1;
4077 if (wordlen
>= 1 && !strncmp (*argv
, "all", wordlen
))
4079 /* Apply action to all signals except those used by the
4080 debugger. Silently skip those. */
4083 siglast
= nsigs
- 1;
4085 else if (wordlen
>= 1 && !strncmp (*argv
, "stop", wordlen
))
4087 SET_SIGS (nsigs
, sigs
, signal_stop
);
4088 SET_SIGS (nsigs
, sigs
, signal_print
);
4090 else if (wordlen
>= 1 && !strncmp (*argv
, "ignore", wordlen
))
4092 UNSET_SIGS (nsigs
, sigs
, signal_program
);
4094 else if (wordlen
>= 2 && !strncmp (*argv
, "print", wordlen
))
4096 SET_SIGS (nsigs
, sigs
, signal_print
);
4098 else if (wordlen
>= 2 && !strncmp (*argv
, "pass", wordlen
))
4100 SET_SIGS (nsigs
, sigs
, signal_program
);
4102 else if (wordlen
>= 3 && !strncmp (*argv
, "nostop", wordlen
))
4104 UNSET_SIGS (nsigs
, sigs
, signal_stop
);
4106 else if (wordlen
>= 3 && !strncmp (*argv
, "noignore", wordlen
))
4108 SET_SIGS (nsigs
, sigs
, signal_program
);
4110 else if (wordlen
>= 4 && !strncmp (*argv
, "noprint", wordlen
))
4112 UNSET_SIGS (nsigs
, sigs
, signal_print
);
4113 UNSET_SIGS (nsigs
, sigs
, signal_stop
);
4115 else if (wordlen
>= 4 && !strncmp (*argv
, "nopass", wordlen
))
4117 UNSET_SIGS (nsigs
, sigs
, signal_program
);
4119 else if (digits
> 0)
4121 /* It is numeric. The numeric signal refers to our own
4122 internal signal numbering from target.h, not to host/target
4123 signal number. This is a feature; users really should be
4124 using symbolic names anyway, and the common ones like
4125 SIGHUP, SIGINT, SIGALRM, etc. will work right anyway. */
4127 sigfirst
= siglast
= (int)
4128 target_signal_from_command (atoi (*argv
));
4129 if ((*argv
)[digits
] == '-')
4132 target_signal_from_command (atoi ((*argv
) + digits
+ 1));
4134 if (sigfirst
> siglast
)
4136 /* Bet he didn't figure we'd think of this case... */
4144 oursig
= target_signal_from_name (*argv
);
4145 if (oursig
!= TARGET_SIGNAL_UNKNOWN
)
4147 sigfirst
= siglast
= (int) oursig
;
4151 /* Not a number and not a recognized flag word => complain. */
4152 error (_("Unrecognized or ambiguous flag word: \"%s\"."), *argv
);
4156 /* If any signal numbers or symbol names were found, set flags for
4157 which signals to apply actions to. */
4159 for (signum
= sigfirst
; signum
>= 0 && signum
<= siglast
; signum
++)
4161 switch ((enum target_signal
) signum
)
4163 case TARGET_SIGNAL_TRAP
:
4164 case TARGET_SIGNAL_INT
:
4165 if (!allsigs
&& !sigs
[signum
])
4167 if (query ("%s is used by the debugger.\n\
4168 Are you sure you want to change it? ", target_signal_to_name ((enum target_signal
) signum
)))
4174 printf_unfiltered (_("Not confirmed, unchanged.\n"));
4175 gdb_flush (gdb_stdout
);
4179 case TARGET_SIGNAL_0
:
4180 case TARGET_SIGNAL_DEFAULT
:
4181 case TARGET_SIGNAL_UNKNOWN
:
4182 /* Make sure that "all" doesn't print these. */
4193 target_notice_signals (inferior_ptid
);
4197 /* Show the results. */
4198 sig_print_header ();
4199 for (signum
= 0; signum
< nsigs
; signum
++)
4203 sig_print_info (signum
);
4208 do_cleanups (old_chain
);
4212 xdb_handle_command (char *args
, int from_tty
)
4215 struct cleanup
*old_chain
;
4217 /* Break the command line up into args. */
4219 argv
= buildargv (args
);
4224 old_chain
= make_cleanup_freeargv (argv
);
4225 if (argv
[1] != (char *) NULL
)
4230 bufLen
= strlen (argv
[0]) + 20;
4231 argBuf
= (char *) xmalloc (bufLen
);
4235 enum target_signal oursig
;
4237 oursig
= target_signal_from_name (argv
[0]);
4238 memset (argBuf
, 0, bufLen
);
4239 if (strcmp (argv
[1], "Q") == 0)
4240 sprintf (argBuf
, "%s %s", argv
[0], "noprint");
4243 if (strcmp (argv
[1], "s") == 0)
4245 if (!signal_stop
[oursig
])
4246 sprintf (argBuf
, "%s %s", argv
[0], "stop");
4248 sprintf (argBuf
, "%s %s", argv
[0], "nostop");
4250 else if (strcmp (argv
[1], "i") == 0)
4252 if (!signal_program
[oursig
])
4253 sprintf (argBuf
, "%s %s", argv
[0], "pass");
4255 sprintf (argBuf
, "%s %s", argv
[0], "nopass");
4257 else if (strcmp (argv
[1], "r") == 0)
4259 if (!signal_print
[oursig
])
4260 sprintf (argBuf
, "%s %s", argv
[0], "print");
4262 sprintf (argBuf
, "%s %s", argv
[0], "noprint");
4268 handle_command (argBuf
, from_tty
);
4270 printf_filtered (_("Invalid signal handling flag.\n"));
4275 do_cleanups (old_chain
);
4278 /* Print current contents of the tables set by the handle command.
4279 It is possible we should just be printing signals actually used
4280 by the current target (but for things to work right when switching
4281 targets, all signals should be in the signal tables). */
4284 signals_info (char *signum_exp
, int from_tty
)
4286 enum target_signal oursig
;
4287 sig_print_header ();
4291 /* First see if this is a symbol name. */
4292 oursig
= target_signal_from_name (signum_exp
);
4293 if (oursig
== TARGET_SIGNAL_UNKNOWN
)
4295 /* No, try numeric. */
4297 target_signal_from_command (parse_and_eval_long (signum_exp
));
4299 sig_print_info (oursig
);
4303 printf_filtered ("\n");
4304 /* These ugly casts brought to you by the native VAX compiler. */
4305 for (oursig
= TARGET_SIGNAL_FIRST
;
4306 (int) oursig
< (int) TARGET_SIGNAL_LAST
;
4307 oursig
= (enum target_signal
) ((int) oursig
+ 1))
4311 if (oursig
!= TARGET_SIGNAL_UNKNOWN
4312 && oursig
!= TARGET_SIGNAL_DEFAULT
&& oursig
!= TARGET_SIGNAL_0
)
4313 sig_print_info (oursig
);
4316 printf_filtered (_("\nUse the \"handle\" command to change these tables.\n"));
4319 struct inferior_status
4321 enum target_signal stop_signal
;
4325 int stop_stack_dummy
;
4326 int stopped_by_random_signal
;
4327 int stepping_over_breakpoint
;
4328 CORE_ADDR step_range_start
;
4329 CORE_ADDR step_range_end
;
4330 struct frame_id step_frame_id
;
4331 enum step_over_calls_kind step_over_calls
;
4332 CORE_ADDR step_resume_break_address
;
4333 int stop_after_trap
;
4336 /* These are here because if call_function_by_hand has written some
4337 registers and then decides to call error(), we better not have changed
4339 struct regcache
*registers
;
4341 /* A frame unique identifier. */
4342 struct frame_id selected_frame_id
;
4344 int breakpoint_proceeded
;
4345 int restore_stack_info
;
4346 int proceed_to_finish
;
4350 write_inferior_status_register (struct inferior_status
*inf_status
, int regno
,
4353 int size
= register_size (current_gdbarch
, regno
);
4354 void *buf
= alloca (size
);
4355 store_signed_integer (buf
, size
, val
);
4356 regcache_raw_write (inf_status
->registers
, regno
, buf
);
4359 /* Save all of the information associated with the inferior<==>gdb
4360 connection. INF_STATUS is a pointer to a "struct inferior_status"
4361 (defined in inferior.h). */
4363 struct inferior_status
*
4364 save_inferior_status (int restore_stack_info
)
4366 struct inferior_status
*inf_status
= XMALLOC (struct inferior_status
);
4367 struct thread_info
*tp
= inferior_thread ();
4369 inf_status
->stop_signal
= stop_signal
;
4370 inf_status
->stop_pc
= stop_pc
;
4371 inf_status
->stop_step
= stop_step
;
4372 inf_status
->stop_stack_dummy
= stop_stack_dummy
;
4373 inf_status
->stopped_by_random_signal
= stopped_by_random_signal
;
4374 inf_status
->stepping_over_breakpoint
= tp
->trap_expected
;
4375 inf_status
->step_range_start
= tp
->step_range_start
;
4376 inf_status
->step_range_end
= tp
->step_range_end
;
4377 inf_status
->step_frame_id
= tp
->step_frame_id
;
4378 inf_status
->step_over_calls
= tp
->step_over_calls
;
4379 inf_status
->stop_after_trap
= stop_after_trap
;
4380 inf_status
->stop_soon
= stop_soon
;
4381 /* Save original bpstat chain here; replace it with copy of chain.
4382 If caller's caller is walking the chain, they'll be happier if we
4383 hand them back the original chain when restore_inferior_status is
4385 inf_status
->stop_bpstat
= tp
->stop_bpstat
;
4386 tp
->stop_bpstat
= bpstat_copy (tp
->stop_bpstat
);
4387 inf_status
->breakpoint_proceeded
= breakpoint_proceeded
;
4388 inf_status
->restore_stack_info
= restore_stack_info
;
4389 inf_status
->proceed_to_finish
= tp
->proceed_to_finish
;
4391 inf_status
->registers
= regcache_dup (get_current_regcache ());
4393 inf_status
->selected_frame_id
= get_frame_id (get_selected_frame (NULL
));
4398 restore_selected_frame (void *args
)
4400 struct frame_id
*fid
= (struct frame_id
*) args
;
4401 struct frame_info
*frame
;
4403 frame
= frame_find_by_id (*fid
);
4405 /* If inf_status->selected_frame_id is NULL, there was no previously
4409 warning (_("Unable to restore previously selected frame."));
4413 select_frame (frame
);
4419 restore_inferior_status (struct inferior_status
*inf_status
)
4421 struct thread_info
*tp
= inferior_thread ();
4423 stop_signal
= inf_status
->stop_signal
;
4424 stop_pc
= inf_status
->stop_pc
;
4425 stop_step
= inf_status
->stop_step
;
4426 stop_stack_dummy
= inf_status
->stop_stack_dummy
;
4427 stopped_by_random_signal
= inf_status
->stopped_by_random_signal
;
4428 tp
->trap_expected
= inf_status
->stepping_over_breakpoint
;
4429 tp
->step_range_start
= inf_status
->step_range_start
;
4430 tp
->step_range_end
= inf_status
->step_range_end
;
4431 tp
->step_frame_id
= inf_status
->step_frame_id
;
4432 tp
->step_over_calls
= inf_status
->step_over_calls
;
4433 stop_after_trap
= inf_status
->stop_after_trap
;
4434 stop_soon
= inf_status
->stop_soon
;
4435 bpstat_clear (&tp
->stop_bpstat
);
4436 tp
->stop_bpstat
= inf_status
->stop_bpstat
;
4437 breakpoint_proceeded
= inf_status
->breakpoint_proceeded
;
4438 tp
->proceed_to_finish
= inf_status
->proceed_to_finish
;
4440 /* The inferior can be gone if the user types "print exit(0)"
4441 (and perhaps other times). */
4442 if (target_has_execution
)
4443 /* NB: The register write goes through to the target. */
4444 regcache_cpy (get_current_regcache (), inf_status
->registers
);
4445 regcache_xfree (inf_status
->registers
);
4447 /* FIXME: If we are being called after stopping in a function which
4448 is called from gdb, we should not be trying to restore the
4449 selected frame; it just prints a spurious error message (The
4450 message is useful, however, in detecting bugs in gdb (like if gdb
4451 clobbers the stack)). In fact, should we be restoring the
4452 inferior status at all in that case? . */
4454 if (target_has_stack
&& inf_status
->restore_stack_info
)
4456 /* The point of catch_errors is that if the stack is clobbered,
4457 walking the stack might encounter a garbage pointer and
4458 error() trying to dereference it. */
4460 (restore_selected_frame
, &inf_status
->selected_frame_id
,
4461 "Unable to restore previously selected frame:\n",
4462 RETURN_MASK_ERROR
) == 0)
4463 /* Error in restoring the selected frame. Select the innermost
4465 select_frame (get_current_frame ());
4473 do_restore_inferior_status_cleanup (void *sts
)
4475 restore_inferior_status (sts
);
4479 make_cleanup_restore_inferior_status (struct inferior_status
*inf_status
)
4481 return make_cleanup (do_restore_inferior_status_cleanup
, inf_status
);
4485 discard_inferior_status (struct inferior_status
*inf_status
)
4487 /* See save_inferior_status for info on stop_bpstat. */
4488 bpstat_clear (&inf_status
->stop_bpstat
);
4489 regcache_xfree (inf_status
->registers
);
4494 inferior_has_forked (ptid_t pid
, ptid_t
*child_pid
)
4496 struct target_waitstatus last
;
4499 get_last_target_status (&last_ptid
, &last
);
4501 if (last
.kind
!= TARGET_WAITKIND_FORKED
)
4504 if (!ptid_equal (last_ptid
, pid
))
4507 *child_pid
= last
.value
.related_pid
;
4512 inferior_has_vforked (ptid_t pid
, ptid_t
*child_pid
)
4514 struct target_waitstatus last
;
4517 get_last_target_status (&last_ptid
, &last
);
4519 if (last
.kind
!= TARGET_WAITKIND_VFORKED
)
4522 if (!ptid_equal (last_ptid
, pid
))
4525 *child_pid
= last
.value
.related_pid
;
4530 inferior_has_execd (ptid_t pid
, char **execd_pathname
)
4532 struct target_waitstatus last
;
4535 get_last_target_status (&last_ptid
, &last
);
4537 if (last
.kind
!= TARGET_WAITKIND_EXECD
)
4540 if (!ptid_equal (last_ptid
, pid
))
4543 *execd_pathname
= xstrdup (last
.value
.execd_pathname
);
4547 /* Oft used ptids */
4549 ptid_t minus_one_ptid
;
4551 /* Create a ptid given the necessary PID, LWP, and TID components. */
4554 ptid_build (int pid
, long lwp
, long tid
)
4564 /* Create a ptid from just a pid. */
4567 pid_to_ptid (int pid
)
4569 return ptid_build (pid
, 0, 0);
4572 /* Fetch the pid (process id) component from a ptid. */
4575 ptid_get_pid (ptid_t ptid
)
4580 /* Fetch the lwp (lightweight process) component from a ptid. */
4583 ptid_get_lwp (ptid_t ptid
)
4588 /* Fetch the tid (thread id) component from a ptid. */
4591 ptid_get_tid (ptid_t ptid
)
4596 /* ptid_equal() is used to test equality of two ptids. */
4599 ptid_equal (ptid_t ptid1
, ptid_t ptid2
)
4601 return (ptid1
.pid
== ptid2
.pid
&& ptid1
.lwp
== ptid2
.lwp
4602 && ptid1
.tid
== ptid2
.tid
);
4605 /* restore_inferior_ptid() will be used by the cleanup machinery
4606 to restore the inferior_ptid value saved in a call to
4607 save_inferior_ptid(). */
4610 restore_inferior_ptid (void *arg
)
4612 ptid_t
*saved_ptid_ptr
= arg
;
4613 inferior_ptid
= *saved_ptid_ptr
;
4617 /* Save the value of inferior_ptid so that it may be restored by a
4618 later call to do_cleanups(). Returns the struct cleanup pointer
4619 needed for later doing the cleanup. */
4622 save_inferior_ptid (void)
4624 ptid_t
*saved_ptid_ptr
;
4626 saved_ptid_ptr
= xmalloc (sizeof (ptid_t
));
4627 *saved_ptid_ptr
= inferior_ptid
;
4628 return make_cleanup (restore_inferior_ptid
, saved_ptid_ptr
);
4633 static int non_stop_1
= 0;
4636 set_non_stop (char *args
, int from_tty
,
4637 struct cmd_list_element
*c
)
4639 if (target_has_execution
)
4641 non_stop_1
= non_stop
;
4642 error (_("Cannot change this setting while the inferior is running."));
4645 non_stop
= non_stop_1
;
4649 show_non_stop (struct ui_file
*file
, int from_tty
,
4650 struct cmd_list_element
*c
, const char *value
)
4652 fprintf_filtered (file
,
4653 _("Controlling the inferior in non-stop mode is %s.\n"),
4659 _initialize_infrun (void)
4663 struct cmd_list_element
*c
;
4665 add_info ("signals", signals_info
, _("\
4666 What debugger does when program gets various signals.\n\
4667 Specify a signal as argument to print info on that signal only."));
4668 add_info_alias ("handle", "signals", 0);
4670 add_com ("handle", class_run
, handle_command
, _("\
4671 Specify how to handle a signal.\n\
4672 Args are signals and actions to apply to those signals.\n\
4673 Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\
4674 from 1-15 are allowed for compatibility with old versions of GDB.\n\
4675 Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\
4676 The special arg \"all\" is recognized to mean all signals except those\n\
4677 used by the debugger, typically SIGTRAP and SIGINT.\n\
4678 Recognized actions include \"stop\", \"nostop\", \"print\", \"noprint\",\n\
4679 \"pass\", \"nopass\", \"ignore\", or \"noignore\".\n\
4680 Stop means reenter debugger if this signal happens (implies print).\n\
4681 Print means print a message if this signal happens.\n\
4682 Pass means let program see this signal; otherwise program doesn't know.\n\
4683 Ignore is a synonym for nopass and noignore is a synonym for pass.\n\
4684 Pass and Stop may be combined."));
4687 add_com ("lz", class_info
, signals_info
, _("\
4688 What debugger does when program gets various signals.\n\
4689 Specify a signal as argument to print info on that signal only."));
4690 add_com ("z", class_run
, xdb_handle_command
, _("\
4691 Specify how to handle a signal.\n\
4692 Args are signals and actions to apply to those signals.\n\
4693 Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\
4694 from 1-15 are allowed for compatibility with old versions of GDB.\n\
4695 Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\
4696 The special arg \"all\" is recognized to mean all signals except those\n\
4697 used by the debugger, typically SIGTRAP and SIGINT.\n\
4698 Recognized actions include \"s\" (toggles between stop and nostop), \n\
4699 \"r\" (toggles between print and noprint), \"i\" (toggles between pass and \
4700 nopass), \"Q\" (noprint)\n\
4701 Stop means reenter debugger if this signal happens (implies print).\n\
4702 Print means print a message if this signal happens.\n\
4703 Pass means let program see this signal; otherwise program doesn't know.\n\
4704 Ignore is a synonym for nopass and noignore is a synonym for pass.\n\
4705 Pass and Stop may be combined."));
4709 stop_command
= add_cmd ("stop", class_obscure
,
4710 not_just_help_class_command
, _("\
4711 There is no `stop' command, but you can set a hook on `stop'.\n\
4712 This allows you to set a list of commands to be run each time execution\n\
4713 of the program stops."), &cmdlist
);
4715 add_setshow_zinteger_cmd ("infrun", class_maintenance
, &debug_infrun
, _("\
4716 Set inferior debugging."), _("\
4717 Show inferior debugging."), _("\
4718 When non-zero, inferior specific debugging is enabled."),
4721 &setdebuglist
, &showdebuglist
);
4723 add_setshow_boolean_cmd ("displaced", class_maintenance
, &debug_displaced
, _("\
4724 Set displaced stepping debugging."), _("\
4725 Show displaced stepping debugging."), _("\
4726 When non-zero, displaced stepping specific debugging is enabled."),
4728 show_debug_displaced
,
4729 &setdebuglist
, &showdebuglist
);
4731 add_setshow_boolean_cmd ("non-stop", no_class
,
4733 Set whether gdb controls the inferior in non-stop mode."), _("\
4734 Show whether gdb controls the inferior in non-stop mode."), _("\
4735 When debugging a multi-threaded program and this setting is\n\
4736 off (the default, also called all-stop mode), when one thread stops\n\
4737 (for a breakpoint, watchpoint, exception, or similar events), GDB stops\n\
4738 all other threads in the program while you interact with the thread of\n\
4739 interest. When you continue or step a thread, you can allow the other\n\
4740 threads to run, or have them remain stopped, but while you inspect any\n\
4741 thread's state, all threads stop.\n\
4743 In non-stop mode, when one thread stops, other threads can continue\n\
4744 to run freely. You'll be able to step each thread independently,\n\
4745 leave it stopped or free to run as needed."),
4751 numsigs
= (int) TARGET_SIGNAL_LAST
;
4752 signal_stop
= (unsigned char *) xmalloc (sizeof (signal_stop
[0]) * numsigs
);
4753 signal_print
= (unsigned char *)
4754 xmalloc (sizeof (signal_print
[0]) * numsigs
);
4755 signal_program
= (unsigned char *)
4756 xmalloc (sizeof (signal_program
[0]) * numsigs
);
4757 for (i
= 0; i
< numsigs
; i
++)
4760 signal_print
[i
] = 1;
4761 signal_program
[i
] = 1;
4764 /* Signals caused by debugger's own actions
4765 should not be given to the program afterwards. */
4766 signal_program
[TARGET_SIGNAL_TRAP
] = 0;
4767 signal_program
[TARGET_SIGNAL_INT
] = 0;
4769 /* Signals that are not errors should not normally enter the debugger. */
4770 signal_stop
[TARGET_SIGNAL_ALRM
] = 0;
4771 signal_print
[TARGET_SIGNAL_ALRM
] = 0;
4772 signal_stop
[TARGET_SIGNAL_VTALRM
] = 0;
4773 signal_print
[TARGET_SIGNAL_VTALRM
] = 0;
4774 signal_stop
[TARGET_SIGNAL_PROF
] = 0;
4775 signal_print
[TARGET_SIGNAL_PROF
] = 0;
4776 signal_stop
[TARGET_SIGNAL_CHLD
] = 0;
4777 signal_print
[TARGET_SIGNAL_CHLD
] = 0;
4778 signal_stop
[TARGET_SIGNAL_IO
] = 0;
4779 signal_print
[TARGET_SIGNAL_IO
] = 0;
4780 signal_stop
[TARGET_SIGNAL_POLL
] = 0;
4781 signal_print
[TARGET_SIGNAL_POLL
] = 0;
4782 signal_stop
[TARGET_SIGNAL_URG
] = 0;
4783 signal_print
[TARGET_SIGNAL_URG
] = 0;
4784 signal_stop
[TARGET_SIGNAL_WINCH
] = 0;
4785 signal_print
[TARGET_SIGNAL_WINCH
] = 0;
4787 /* These signals are used internally by user-level thread
4788 implementations. (See signal(5) on Solaris.) Like the above
4789 signals, a healthy program receives and handles them as part of
4790 its normal operation. */
4791 signal_stop
[TARGET_SIGNAL_LWP
] = 0;
4792 signal_print
[TARGET_SIGNAL_LWP
] = 0;
4793 signal_stop
[TARGET_SIGNAL_WAITING
] = 0;
4794 signal_print
[TARGET_SIGNAL_WAITING
] = 0;
4795 signal_stop
[TARGET_SIGNAL_CANCEL
] = 0;
4796 signal_print
[TARGET_SIGNAL_CANCEL
] = 0;
4798 add_setshow_zinteger_cmd ("stop-on-solib-events", class_support
,
4799 &stop_on_solib_events
, _("\
4800 Set stopping for shared library events."), _("\
4801 Show stopping for shared library events."), _("\
4802 If nonzero, gdb will give control to the user when the dynamic linker\n\
4803 notifies gdb of shared library events. The most common event of interest\n\
4804 to the user would be loading/unloading of a new library."),
4806 show_stop_on_solib_events
,
4807 &setlist
, &showlist
);
4809 add_setshow_enum_cmd ("follow-fork-mode", class_run
,
4810 follow_fork_mode_kind_names
,
4811 &follow_fork_mode_string
, _("\
4812 Set debugger response to a program call of fork or vfork."), _("\
4813 Show debugger response to a program call of fork or vfork."), _("\
4814 A fork or vfork creates a new process. follow-fork-mode can be:\n\
4815 parent - the original process is debugged after a fork\n\
4816 child - the new process is debugged after a fork\n\
4817 The unfollowed process will continue to run.\n\
4818 By default, the debugger will follow the parent process."),
4820 show_follow_fork_mode_string
,
4821 &setlist
, &showlist
);
4823 add_setshow_enum_cmd ("scheduler-locking", class_run
,
4824 scheduler_enums
, &scheduler_mode
, _("\
4825 Set mode for locking scheduler during execution."), _("\
4826 Show mode for locking scheduler during execution."), _("\
4827 off == no locking (threads may preempt at any time)\n\
4828 on == full locking (no thread except the current thread may run)\n\
4829 step == scheduler locked during every single-step operation.\n\
4830 In this mode, no other thread may run during a step command.\n\
4831 Other threads may run while stepping over a function call ('next')."),
4832 set_schedlock_func
, /* traps on target vector */
4833 show_scheduler_mode
,
4834 &setlist
, &showlist
);
4836 add_setshow_boolean_cmd ("step-mode", class_run
, &step_stop_if_no_debug
, _("\
4837 Set mode of the step operation."), _("\
4838 Show mode of the step operation."), _("\
4839 When set, doing a step over a function without debug line information\n\
4840 will stop at the first instruction of that function. Otherwise, the\n\
4841 function is skipped and the step command stops at a different source line."),
4843 show_step_stop_if_no_debug
,
4844 &setlist
, &showlist
);
4846 add_setshow_boolean_cmd ("can-use-displaced-stepping", class_maintenance
,
4847 &can_use_displaced_stepping
, _("\
4848 Set debugger's willingness to use displaced stepping."), _("\
4849 Show debugger's willingness to use displaced stepping."), _("\
4850 If zero, gdb will not use displaced stepping to step over\n\
4851 breakpoints, even if such is supported by the target."),
4853 show_can_use_displaced_stepping
,
4854 &maintenance_set_cmdlist
,
4855 &maintenance_show_cmdlist
);
4857 /* ptid initializations */
4858 null_ptid
= ptid_build (0, 0, 0);
4859 minus_one_ptid
= ptid_build (-1, 0, 0);
4860 inferior_ptid
= null_ptid
;
4861 target_last_wait_ptid
= minus_one_ptid
;
4862 displaced_step_ptid
= null_ptid
;
4864 observer_attach_thread_ptid_changed (infrun_thread_ptid_changed
);