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"
52 /* Prototypes for local functions */
54 static void signals_info (char *, int);
56 static void handle_command (char *, int);
58 static void sig_print_info (enum target_signal
);
60 static void sig_print_header (void);
62 static void resume_cleanups (void *);
64 static int hook_stop_stub (void *);
66 static int restore_selected_frame (void *);
68 static void build_infrun (void);
70 static int follow_fork (void);
72 static void set_schedlock_func (char *args
, int from_tty
,
73 struct cmd_list_element
*c
);
75 struct execution_control_state
;
77 static int currently_stepping (struct execution_control_state
*ecs
);
79 static void xdb_handle_command (char *args
, int from_tty
);
81 static int prepare_to_proceed (int);
83 void _initialize_infrun (void);
85 /* When set, stop the 'step' command if we enter a function which has
86 no line number information. The normal behavior is that we step
87 over such function. */
88 int step_stop_if_no_debug
= 0;
90 show_step_stop_if_no_debug (struct ui_file
*file
, int from_tty
,
91 struct cmd_list_element
*c
, const char *value
)
93 fprintf_filtered (file
, _("Mode of the step operation is %s.\n"), value
);
96 /* In asynchronous mode, but simulating synchronous execution. */
98 int sync_execution
= 0;
100 /* wait_for_inferior and normal_stop use this to notify the user
101 when the inferior stopped in a different thread than it had been
104 static ptid_t previous_inferior_ptid
;
106 int debug_displaced
= 0;
108 show_debug_displaced (struct ui_file
*file
, int from_tty
,
109 struct cmd_list_element
*c
, const char *value
)
111 fprintf_filtered (file
, _("Displace stepping debugging is %s.\n"), value
);
114 static int debug_infrun
= 0;
116 show_debug_infrun (struct ui_file
*file
, int from_tty
,
117 struct cmd_list_element
*c
, const char *value
)
119 fprintf_filtered (file
, _("Inferior debugging is %s.\n"), value
);
122 /* If the program uses ELF-style shared libraries, then calls to
123 functions in shared libraries go through stubs, which live in a
124 table called the PLT (Procedure Linkage Table). The first time the
125 function is called, the stub sends control to the dynamic linker,
126 which looks up the function's real address, patches the stub so
127 that future calls will go directly to the function, and then passes
128 control to the function.
130 If we are stepping at the source level, we don't want to see any of
131 this --- we just want to skip over the stub and the dynamic linker.
132 The simple approach is to single-step until control leaves the
135 However, on some systems (e.g., Red Hat's 5.2 distribution) the
136 dynamic linker calls functions in the shared C library, so you
137 can't tell from the PC alone whether the dynamic linker is still
138 running. In this case, we use a step-resume breakpoint to get us
139 past the dynamic linker, as if we were using "next" to step over a
142 IN_SOLIB_DYNSYM_RESOLVE_CODE says whether we're in the dynamic
143 linker code or not. Normally, this means we single-step. However,
144 if SKIP_SOLIB_RESOLVER then returns non-zero, then its value is an
145 address where we can place a step-resume breakpoint to get past the
146 linker's symbol resolution function.
148 IN_SOLIB_DYNSYM_RESOLVE_CODE can generally be implemented in a
149 pretty portable way, by comparing the PC against the address ranges
150 of the dynamic linker's sections.
152 SKIP_SOLIB_RESOLVER is generally going to be system-specific, since
153 it depends on internal details of the dynamic linker. It's usually
154 not too hard to figure out where to put a breakpoint, but it
155 certainly isn't portable. SKIP_SOLIB_RESOLVER should do plenty of
156 sanity checking. If it can't figure things out, returning zero and
157 getting the (possibly confusing) stepping behavior is better than
158 signalling an error, which will obscure the change in the
161 /* This function returns TRUE if pc is the address of an instruction
162 that lies within the dynamic linker (such as the event hook, or the
165 This function must be used only when a dynamic linker event has
166 been caught, and the inferior is being stepped out of the hook, or
167 undefined results are guaranteed. */
169 #ifndef SOLIB_IN_DYNAMIC_LINKER
170 #define SOLIB_IN_DYNAMIC_LINKER(pid,pc) 0
174 /* Convert the #defines into values. This is temporary until wfi control
175 flow is completely sorted out. */
177 #ifndef CANNOT_STEP_HW_WATCHPOINTS
178 #define CANNOT_STEP_HW_WATCHPOINTS 0
180 #undef CANNOT_STEP_HW_WATCHPOINTS
181 #define CANNOT_STEP_HW_WATCHPOINTS 1
184 /* Tables of how to react to signals; the user sets them. */
186 static unsigned char *signal_stop
;
187 static unsigned char *signal_print
;
188 static unsigned char *signal_program
;
190 #define SET_SIGS(nsigs,sigs,flags) \
192 int signum = (nsigs); \
193 while (signum-- > 0) \
194 if ((sigs)[signum]) \
195 (flags)[signum] = 1; \
198 #define UNSET_SIGS(nsigs,sigs,flags) \
200 int signum = (nsigs); \
201 while (signum-- > 0) \
202 if ((sigs)[signum]) \
203 (flags)[signum] = 0; \
206 /* Value to pass to target_resume() to cause all threads to resume */
208 #define RESUME_ALL (pid_to_ptid (-1))
210 /* Command list pointer for the "stop" placeholder. */
212 static struct cmd_list_element
*stop_command
;
214 /* Function inferior was in as of last step command. */
216 static struct symbol
*step_start_function
;
218 /* Nonzero if we are presently stepping over a breakpoint.
220 If we hit a breakpoint or watchpoint, and then continue,
221 we need to single step the current thread with breakpoints
222 disabled, to avoid hitting the same breakpoint or
223 watchpoint again. And we should step just a single
224 thread and keep other threads stopped, so that
225 other threads don't miss breakpoints while they are removed.
227 So, this variable simultaneously means that we need to single
228 step the current thread, keep other threads stopped, and that
229 breakpoints should be removed while we step.
231 This variable is set either:
232 - in proceed, when we resume inferior on user's explicit request
233 - in keep_going, if handle_inferior_event decides we need to
234 step over breakpoint.
236 The variable is cleared in clear_proceed_status, called every
237 time before we call proceed. The proceed calls wait_for_inferior,
238 which calls handle_inferior_event in a loop, and until
239 wait_for_inferior exits, this variable is changed only by keep_going. */
241 static int stepping_over_breakpoint
;
243 /* Nonzero if we want to give control to the user when we're notified
244 of shared library events by the dynamic linker. */
245 static int stop_on_solib_events
;
247 show_stop_on_solib_events (struct ui_file
*file
, int from_tty
,
248 struct cmd_list_element
*c
, const char *value
)
250 fprintf_filtered (file
, _("Stopping for shared library events is %s.\n"),
254 /* Nonzero means expecting a trace trap
255 and should stop the inferior and return silently when it happens. */
259 /* Nonzero means expecting a trap and caller will handle it themselves.
260 It is used after attach, due to attaching to a process;
261 when running in the shell before the child program has been exec'd;
262 and when running some kinds of remote stuff (FIXME?). */
264 enum stop_kind stop_soon
;
266 /* Nonzero if proceed is being used for a "finish" command or a similar
267 situation when stop_registers should be saved. */
269 int proceed_to_finish
;
271 /* Save register contents here when about to pop a stack dummy frame,
272 if-and-only-if proceed_to_finish is set.
273 Thus this contains the return value from the called function (assuming
274 values are returned in a register). */
276 struct regcache
*stop_registers
;
278 /* Nonzero after stop if current stack frame should be printed. */
280 static int stop_print_frame
;
282 /* Step-resume or longjmp-resume breakpoint. */
283 static struct breakpoint
*step_resume_breakpoint
= NULL
;
285 /* This is a cached copy of the pid/waitstatus of the last event
286 returned by target_wait()/deprecated_target_wait_hook(). This
287 information is returned by get_last_target_status(). */
288 static ptid_t target_last_wait_ptid
;
289 static struct target_waitstatus target_last_waitstatus
;
291 /* This is used to remember when a fork, vfork or exec event
292 was caught by a catchpoint, and thus the event is to be
293 followed at the next resume of the inferior, and not
297 enum target_waitkind kind
;
304 char *execd_pathname
;
308 static const char follow_fork_mode_child
[] = "child";
309 static const char follow_fork_mode_parent
[] = "parent";
311 static const char *follow_fork_mode_kind_names
[] = {
312 follow_fork_mode_child
,
313 follow_fork_mode_parent
,
317 static const char *follow_fork_mode_string
= follow_fork_mode_parent
;
319 show_follow_fork_mode_string (struct ui_file
*file
, int from_tty
,
320 struct cmd_list_element
*c
, const char *value
)
322 fprintf_filtered (file
, _("\
323 Debugger response to a program call of fork or vfork is \"%s\".\n"),
331 int follow_child
= (follow_fork_mode_string
== follow_fork_mode_child
);
333 return target_follow_fork (follow_child
);
337 follow_inferior_reset_breakpoints (void)
339 /* Was there a step_resume breakpoint? (There was if the user
340 did a "next" at the fork() call.) If so, explicitly reset its
343 step_resumes are a form of bp that are made to be per-thread.
344 Since we created the step_resume bp when the parent process
345 was being debugged, and now are switching to the child process,
346 from the breakpoint package's viewpoint, that's a switch of
347 "threads". We must update the bp's notion of which thread
348 it is for, or it'll be ignored when it triggers. */
350 if (step_resume_breakpoint
)
351 breakpoint_re_set_thread (step_resume_breakpoint
);
353 /* Reinsert all breakpoints in the child. The user may have set
354 breakpoints after catching the fork, in which case those
355 were never set in the child, but only in the parent. This makes
356 sure the inserted breakpoints match the breakpoint list. */
358 breakpoint_re_set ();
359 insert_breakpoints ();
362 /* EXECD_PATHNAME is assumed to be non-NULL. */
365 follow_exec (int pid
, char *execd_pathname
)
368 struct target_ops
*tgt
;
370 /* This is an exec event that we actually wish to pay attention to.
371 Refresh our symbol table to the newly exec'd program, remove any
374 If there are breakpoints, they aren't really inserted now,
375 since the exec() transformed our inferior into a fresh set
378 We want to preserve symbolic breakpoints on the list, since
379 we have hopes that they can be reset after the new a.out's
380 symbol table is read.
382 However, any "raw" breakpoints must be removed from the list
383 (e.g., the solib bp's), since their address is probably invalid
386 And, we DON'T want to call delete_breakpoints() here, since
387 that may write the bp's "shadow contents" (the instruction
388 value that was overwritten witha TRAP instruction). Since
389 we now have a new a.out, those shadow contents aren't valid. */
390 update_breakpoints_after_exec ();
392 /* If there was one, it's gone now. We cannot truly step-to-next
393 statement through an exec(). */
394 step_resume_breakpoint
= NULL
;
395 step_range_start
= 0;
398 /* What is this a.out's name? */
399 printf_unfiltered (_("Executing new program: %s\n"), execd_pathname
);
401 /* We've followed the inferior through an exec. Therefore, the
402 inferior has essentially been killed & reborn. */
404 gdb_flush (gdb_stdout
);
405 generic_mourn_inferior ();
406 /* Because mourn_inferior resets inferior_ptid. */
407 inferior_ptid
= pid_to_ptid (saved_pid
);
409 if (gdb_sysroot
&& *gdb_sysroot
)
411 char *name
= alloca (strlen (gdb_sysroot
)
412 + strlen (execd_pathname
)
414 strcpy (name
, gdb_sysroot
);
415 strcat (name
, execd_pathname
);
416 execd_pathname
= name
;
419 /* That a.out is now the one to use. */
420 exec_file_attach (execd_pathname
, 0);
422 /* And also is where symbols can be found. */
423 symbol_file_add_main (execd_pathname
, 0);
425 /* Reset the shared library package. This ensures that we get
426 a shlib event when the child reaches "_start", at which point
427 the dld will have had a chance to initialize the child. */
428 no_shared_libraries (NULL
, 0);
429 #ifdef SOLIB_CREATE_INFERIOR_HOOK
430 SOLIB_CREATE_INFERIOR_HOOK (PIDGET (inferior_ptid
));
432 solib_create_inferior_hook ();
435 /* Reinsert all breakpoints. (Those which were symbolic have
436 been reset to the proper address in the new a.out, thanks
437 to symbol_file_command...) */
438 insert_breakpoints ();
440 /* The next resume of this inferior should bring it to the shlib
441 startup breakpoints. (If the user had also set bp's on
442 "main" from the old (parent) process, then they'll auto-
443 matically get reset there in the new process.) */
446 /* Non-zero if we just simulating a single-step. This is needed
447 because we cannot remove the breakpoints in the inferior process
448 until after the `wait' in `wait_for_inferior'. */
449 static int singlestep_breakpoints_inserted_p
= 0;
451 /* The thread we inserted single-step breakpoints for. */
452 static ptid_t singlestep_ptid
;
454 /* PC when we started this single-step. */
455 static CORE_ADDR singlestep_pc
;
457 /* If another thread hit the singlestep breakpoint, we save the original
458 thread here so that we can resume single-stepping it later. */
459 static ptid_t saved_singlestep_ptid
;
460 static int stepping_past_singlestep_breakpoint
;
462 /* If not equal to null_ptid, this means that after stepping over breakpoint
463 is finished, we need to switch to deferred_step_ptid, and step it.
465 The use case is when one thread has hit a breakpoint, and then the user
466 has switched to another thread and issued 'step'. We need to step over
467 breakpoint in the thread which hit the breakpoint, but then continue
468 stepping the thread user has selected. */
469 static ptid_t deferred_step_ptid
;
471 /* Displaced stepping. */
473 /* In non-stop debugging mode, we must take special care to manage
474 breakpoints properly; in particular, the traditional strategy for
475 stepping a thread past a breakpoint it has hit is unsuitable.
476 'Displaced stepping' is a tactic for stepping one thread past a
477 breakpoint it has hit while ensuring that other threads running
478 concurrently will hit the breakpoint as they should.
480 The traditional way to step a thread T off a breakpoint in a
481 multi-threaded program in all-stop mode is as follows:
483 a0) Initially, all threads are stopped, and breakpoints are not
485 a1) We single-step T, leaving breakpoints uninserted.
486 a2) We insert breakpoints, and resume all threads.
488 In non-stop debugging, however, this strategy is unsuitable: we
489 don't want to have to stop all threads in the system in order to
490 continue or step T past a breakpoint. Instead, we use displaced
493 n0) Initially, T is stopped, other threads are running, and
494 breakpoints are inserted.
495 n1) We copy the instruction "under" the breakpoint to a separate
496 location, outside the main code stream, making any adjustments
497 to the instruction, register, and memory state as directed by
499 n2) We single-step T over the instruction at its new location.
500 n3) We adjust the resulting register and memory state as directed
501 by T's architecture. This includes resetting T's PC to point
502 back into the main instruction stream.
505 This approach depends on the following gdbarch methods:
507 - gdbarch_max_insn_length and gdbarch_displaced_step_location
508 indicate where to copy the instruction, and how much space must
509 be reserved there. We use these in step n1.
511 - gdbarch_displaced_step_copy_insn copies a instruction to a new
512 address, and makes any necessary adjustments to the instruction,
513 register contents, and memory. We use this in step n1.
515 - gdbarch_displaced_step_fixup adjusts registers and memory after
516 we have successfuly single-stepped the instruction, to yield the
517 same effect the instruction would have had if we had executed it
518 at its original address. We use this in step n3.
520 - gdbarch_displaced_step_free_closure provides cleanup.
522 The gdbarch_displaced_step_copy_insn and
523 gdbarch_displaced_step_fixup functions must be written so that
524 copying an instruction with gdbarch_displaced_step_copy_insn,
525 single-stepping across the copied instruction, and then applying
526 gdbarch_displaced_insn_fixup should have the same effects on the
527 thread's memory and registers as stepping the instruction in place
528 would have. Exactly which responsibilities fall to the copy and
529 which fall to the fixup is up to the author of those functions.
531 See the comments in gdbarch.sh for details.
533 Note that displaced stepping and software single-step cannot
534 currently be used in combination, although with some care I think
535 they could be made to. Software single-step works by placing
536 breakpoints on all possible subsequent instructions; if the
537 displaced instruction is a PC-relative jump, those breakpoints
538 could fall in very strange places --- on pages that aren't
539 executable, or at addresses that are not proper instruction
540 boundaries. (We do generally let other threads run while we wait
541 to hit the software single-step breakpoint, and they might
542 encounter such a corrupted instruction.) One way to work around
543 this would be to have gdbarch_displaced_step_copy_insn fully
544 simulate the effect of PC-relative instructions (and return NULL)
545 on architectures that use software single-stepping.
547 In non-stop mode, we can have independent and simultaneous step
548 requests, so more than one thread may need to simultaneously step
549 over a breakpoint. The current implementation assumes there is
550 only one scratch space per process. In this case, we have to
551 serialize access to the scratch space. If thread A wants to step
552 over a breakpoint, but we are currently waiting for some other
553 thread to complete a displaced step, we leave thread A stopped and
554 place it in the displaced_step_request_queue. Whenever a displaced
555 step finishes, we pick the next thread in the queue and start a new
556 displaced step operation on it. See displaced_step_prepare and
557 displaced_step_fixup for details. */
559 /* If this is not null_ptid, this is the thread carrying out a
560 displaced single-step. This thread's state will require fixing up
561 once it has completed its step. */
562 static ptid_t displaced_step_ptid
;
564 struct displaced_step_request
567 struct displaced_step_request
*next
;
570 /* A queue of pending displaced stepping requests. */
571 struct displaced_step_request
*displaced_step_request_queue
;
573 /* The architecture the thread had when we stepped it. */
574 static struct gdbarch
*displaced_step_gdbarch
;
576 /* The closure provided gdbarch_displaced_step_copy_insn, to be used
577 for post-step cleanup. */
578 static struct displaced_step_closure
*displaced_step_closure
;
580 /* The address of the original instruction, and the copy we made. */
581 static CORE_ADDR displaced_step_original
, displaced_step_copy
;
583 /* Saved contents of copy area. */
584 static gdb_byte
*displaced_step_saved_copy
;
586 /* When this is non-zero, we are allowed to use displaced stepping, if
587 the architecture supports it. When this is zero, we use
588 traditional the hold-and-step approach. */
589 int can_use_displaced_stepping
= 1;
591 show_can_use_displaced_stepping (struct ui_file
*file
, int from_tty
,
592 struct cmd_list_element
*c
,
595 fprintf_filtered (file
, _("\
596 Debugger's willingness to use displaced stepping to step over "
597 "breakpoints is %s.\n"), value
);
600 /* Return non-zero if displaced stepping is enabled, and can be used
603 use_displaced_stepping (struct gdbarch
*gdbarch
)
605 return (can_use_displaced_stepping
606 && gdbarch_displaced_step_copy_insn_p (gdbarch
));
609 /* Clean out any stray displaced stepping state. */
611 displaced_step_clear (void)
613 /* Indicate that there is no cleanup pending. */
614 displaced_step_ptid
= null_ptid
;
616 if (displaced_step_closure
)
618 gdbarch_displaced_step_free_closure (displaced_step_gdbarch
,
619 displaced_step_closure
);
620 displaced_step_closure
= NULL
;
625 cleanup_displaced_step_closure (void *ptr
)
627 struct displaced_step_closure
*closure
= ptr
;
629 gdbarch_displaced_step_free_closure (current_gdbarch
, closure
);
632 /* Dump LEN bytes at BUF in hex to FILE, followed by a newline. */
634 displaced_step_dump_bytes (struct ui_file
*file
,
640 for (i
= 0; i
< len
; i
++)
641 fprintf_unfiltered (file
, "%02x ", buf
[i
]);
642 fputs_unfiltered ("\n", file
);
645 /* Prepare to single-step, using displaced stepping.
647 Note that we cannot use displaced stepping when we have a signal to
648 deliver. If we have a signal to deliver and an instruction to step
649 over, then after the step, there will be no indication from the
650 target whether the thread entered a signal handler or ignored the
651 signal and stepped over the instruction successfully --- both cases
652 result in a simple SIGTRAP. In the first case we mustn't do a
653 fixup, and in the second case we must --- but we can't tell which.
654 Comments in the code for 'random signals' in handle_inferior_event
655 explain how we handle this case instead.
657 Returns 1 if preparing was successful -- this thread is going to be
658 stepped now; or 0 if displaced stepping this thread got queued. */
660 displaced_step_prepare (ptid_t ptid
)
662 struct cleanup
*old_cleanups
;
663 struct regcache
*regcache
= get_thread_regcache (ptid
);
664 struct gdbarch
*gdbarch
= get_regcache_arch (regcache
);
665 CORE_ADDR original
, copy
;
667 struct displaced_step_closure
*closure
;
669 /* We should never reach this function if the architecture does not
670 support displaced stepping. */
671 gdb_assert (gdbarch_displaced_step_copy_insn_p (gdbarch
));
673 /* For the first cut, we're displaced stepping one thread at a
676 if (!ptid_equal (displaced_step_ptid
, null_ptid
))
678 /* Already waiting for a displaced step to finish. Defer this
679 request and place in queue. */
680 struct displaced_step_request
*req
, *new_req
;
683 fprintf_unfiltered (gdb_stdlog
,
684 "displaced: defering step of %s\n",
685 target_pid_to_str (ptid
));
687 new_req
= xmalloc (sizeof (*new_req
));
688 new_req
->ptid
= ptid
;
689 new_req
->next
= NULL
;
691 if (displaced_step_request_queue
)
693 for (req
= displaced_step_request_queue
;
700 displaced_step_request_queue
= new_req
;
707 fprintf_unfiltered (gdb_stdlog
,
708 "displaced: stepping %s now\n",
709 target_pid_to_str (ptid
));
712 displaced_step_clear ();
714 original
= regcache_read_pc (regcache
);
716 copy
= gdbarch_displaced_step_location (gdbarch
);
717 len
= gdbarch_max_insn_length (gdbarch
);
719 /* Save the original contents of the copy area. */
720 displaced_step_saved_copy
= xmalloc (len
);
721 old_cleanups
= make_cleanup (free_current_contents
,
722 &displaced_step_saved_copy
);
723 read_memory (copy
, displaced_step_saved_copy
, len
);
726 fprintf_unfiltered (gdb_stdlog
, "displaced: saved 0x%s: ",
728 displaced_step_dump_bytes (gdb_stdlog
, displaced_step_saved_copy
, len
);
731 closure
= gdbarch_displaced_step_copy_insn (gdbarch
,
732 original
, copy
, regcache
);
734 /* We don't support the fully-simulated case at present. */
735 gdb_assert (closure
);
737 make_cleanup (cleanup_displaced_step_closure
, closure
);
739 /* Resume execution at the copy. */
740 regcache_write_pc (regcache
, copy
);
742 discard_cleanups (old_cleanups
);
745 fprintf_unfiltered (gdb_stdlog
, "displaced: displaced pc to 0x%s\n",
748 /* Save the information we need to fix things up if the step
750 displaced_step_ptid
= ptid
;
751 displaced_step_gdbarch
= gdbarch
;
752 displaced_step_closure
= closure
;
753 displaced_step_original
= original
;
754 displaced_step_copy
= copy
;
759 displaced_step_clear_cleanup (void *ignore
)
761 displaced_step_clear ();
765 write_memory_ptid (ptid_t ptid
, CORE_ADDR memaddr
, const gdb_byte
*myaddr
, int len
)
767 struct cleanup
*ptid_cleanup
= save_inferior_ptid ();
768 inferior_ptid
= ptid
;
769 write_memory (memaddr
, myaddr
, len
);
770 do_cleanups (ptid_cleanup
);
774 displaced_step_fixup (ptid_t event_ptid
, enum target_signal signal
)
776 struct cleanup
*old_cleanups
;
778 /* Was this event for the pid we displaced? */
779 if (ptid_equal (displaced_step_ptid
, null_ptid
)
780 || ! ptid_equal (displaced_step_ptid
, event_ptid
))
783 old_cleanups
= make_cleanup (displaced_step_clear_cleanup
, 0);
785 /* Restore the contents of the copy area. */
787 ULONGEST len
= gdbarch_max_insn_length (displaced_step_gdbarch
);
788 write_memory_ptid (displaced_step_ptid
, displaced_step_copy
,
789 displaced_step_saved_copy
, len
);
791 fprintf_unfiltered (gdb_stdlog
, "displaced: restored 0x%s\n",
792 paddr_nz (displaced_step_copy
));
795 /* Did the instruction complete successfully? */
796 if (signal
== TARGET_SIGNAL_TRAP
)
798 /* Fix up the resulting state. */
799 gdbarch_displaced_step_fixup (displaced_step_gdbarch
,
800 displaced_step_closure
,
801 displaced_step_original
,
803 get_thread_regcache (displaced_step_ptid
));
807 /* Since the instruction didn't complete, all we can do is
809 struct regcache
*regcache
= get_thread_regcache (event_ptid
);
810 CORE_ADDR pc
= regcache_read_pc (regcache
);
811 pc
= displaced_step_original
+ (pc
- displaced_step_copy
);
812 regcache_write_pc (regcache
, pc
);
815 do_cleanups (old_cleanups
);
817 /* Are there any pending displaced stepping requests? If so, run
819 if (displaced_step_request_queue
)
821 struct displaced_step_request
*head
;
824 head
= displaced_step_request_queue
;
826 displaced_step_request_queue
= head
->next
;
830 fprintf_unfiltered (gdb_stdlog
,
831 "displaced: stepping queued %s now\n",
832 target_pid_to_str (ptid
));
835 displaced_step_ptid
= null_ptid
;
836 displaced_step_prepare (ptid
);
837 target_resume (ptid
, 1, TARGET_SIGNAL_0
);
844 /* Things to clean up if we QUIT out of resume (). */
846 resume_cleanups (void *ignore
)
851 static const char schedlock_off
[] = "off";
852 static const char schedlock_on
[] = "on";
853 static const char schedlock_step
[] = "step";
854 static const char *scheduler_enums
[] = {
860 static const char *scheduler_mode
= schedlock_off
;
862 show_scheduler_mode (struct ui_file
*file
, int from_tty
,
863 struct cmd_list_element
*c
, const char *value
)
865 fprintf_filtered (file
, _("\
866 Mode for locking scheduler during execution is \"%s\".\n"),
871 set_schedlock_func (char *args
, int from_tty
, struct cmd_list_element
*c
)
873 if (!target_can_lock_scheduler
)
875 scheduler_mode
= schedlock_off
;
876 error (_("Target '%s' cannot support this command."), target_shortname
);
881 /* Resume the inferior, but allow a QUIT. This is useful if the user
882 wants to interrupt some lengthy single-stepping operation
883 (for child processes, the SIGINT goes to the inferior, and so
884 we get a SIGINT random_signal, but for remote debugging and perhaps
885 other targets, that's not true).
887 STEP nonzero if we should step (zero to continue instead).
888 SIG is the signal to give the inferior (zero for none). */
890 resume (int step
, enum target_signal sig
)
892 int should_resume
= 1;
893 struct cleanup
*old_cleanups
= make_cleanup (resume_cleanups
, 0);
894 struct regcache
*regcache
= get_current_regcache ();
895 struct gdbarch
*gdbarch
= get_regcache_arch (regcache
);
896 CORE_ADDR pc
= regcache_read_pc (regcache
);
900 fprintf_unfiltered (gdb_stdlog
,
901 "infrun: resume (step=%d, signal=%d), "
902 "stepping_over_breakpoint=%d\n",
903 step
, sig
, stepping_over_breakpoint
);
905 /* Some targets (e.g. Solaris x86) have a kernel bug when stepping
906 over an instruction that causes a page fault without triggering
907 a hardware watchpoint. The kernel properly notices that it shouldn't
908 stop, because the hardware watchpoint is not triggered, but it forgets
909 the step request and continues the program normally.
910 Work around the problem by removing hardware watchpoints if a step is
911 requested, GDB will check for a hardware watchpoint trigger after the
913 if (CANNOT_STEP_HW_WATCHPOINTS
&& step
)
914 remove_hw_watchpoints ();
917 /* Normally, by the time we reach `resume', the breakpoints are either
918 removed or inserted, as appropriate. The exception is if we're sitting
919 at a permanent breakpoint; we need to step over it, but permanent
920 breakpoints can't be removed. So we have to test for it here. */
921 if (breakpoint_here_p (pc
) == permanent_breakpoint_here
)
923 if (gdbarch_skip_permanent_breakpoint_p (gdbarch
))
924 gdbarch_skip_permanent_breakpoint (gdbarch
, regcache
);
927 The program is stopped at a permanent breakpoint, but GDB does not know\n\
928 how to step past a permanent breakpoint on this architecture. Try using\n\
929 a command like `return' or `jump' to continue execution."));
932 /* If enabled, step over breakpoints by executing a copy of the
933 instruction at a different address.
935 We can't use displaced stepping when we have a signal to deliver;
936 the comments for displaced_step_prepare explain why. The
937 comments in the handle_inferior event for dealing with 'random
938 signals' explain what we do instead. */
939 if (use_displaced_stepping (gdbarch
)
940 && stepping_over_breakpoint
941 && sig
== TARGET_SIGNAL_0
)
943 if (!displaced_step_prepare (inferior_ptid
))
944 /* Got placed in displaced stepping queue. Will be resumed
945 later when all the currently queued displaced stepping
950 if (step
&& gdbarch_software_single_step_p (gdbarch
))
952 /* Do it the hard way, w/temp breakpoints */
953 if (gdbarch_software_single_step (gdbarch
, get_current_frame ()))
955 /* ...and don't ask hardware to do it. */
957 /* and do not pull these breakpoints until after a `wait' in
958 `wait_for_inferior' */
959 singlestep_breakpoints_inserted_p
= 1;
960 singlestep_ptid
= inferior_ptid
;
965 /* If there were any forks/vforks/execs that were caught and are
966 now to be followed, then do so. */
967 switch (pending_follow
.kind
)
969 case TARGET_WAITKIND_FORKED
:
970 case TARGET_WAITKIND_VFORKED
:
971 pending_follow
.kind
= TARGET_WAITKIND_SPURIOUS
;
976 case TARGET_WAITKIND_EXECD
:
977 /* follow_exec is called as soon as the exec event is seen. */
978 pending_follow
.kind
= TARGET_WAITKIND_SPURIOUS
;
985 /* Install inferior's terminal modes. */
986 target_terminal_inferior ();
992 resume_ptid
= RESUME_ALL
; /* Default */
994 /* If STEP is set, it's a request to use hardware stepping
995 facilities. But in that case, we should never
996 use singlestep breakpoint. */
997 gdb_assert (!(singlestep_breakpoints_inserted_p
&& step
));
999 if (singlestep_breakpoints_inserted_p
1000 && stepping_past_singlestep_breakpoint
)
1002 /* The situation here is as follows. In thread T1 we wanted to
1003 single-step. Lacking hardware single-stepping we've
1004 set breakpoint at the PC of the next instruction -- call it
1005 P. After resuming, we've hit that breakpoint in thread T2.
1006 Now we've removed original breakpoint, inserted breakpoint
1007 at P+1, and try to step to advance T2 past breakpoint.
1008 We need to step only T2, as if T1 is allowed to freely run,
1009 it can run past P, and if other threads are allowed to run,
1010 they can hit breakpoint at P+1, and nested hits of single-step
1011 breakpoints is not something we'd want -- that's complicated
1012 to support, and has no value. */
1013 resume_ptid
= inferior_ptid
;
1016 if ((step
|| singlestep_breakpoints_inserted_p
)
1017 && stepping_over_breakpoint
)
1019 /* We're allowing a thread to run past a breakpoint it has
1020 hit, by single-stepping the thread with the breakpoint
1021 removed. In which case, we need to single-step only this
1022 thread, and keep others stopped, as they can miss this
1023 breakpoint if allowed to run.
1025 The current code actually removes all breakpoints when
1026 doing this, not just the one being stepped over, so if we
1027 let other threads run, we can actually miss any
1028 breakpoint, not just the one at PC. */
1029 resume_ptid
= inferior_ptid
;
1032 if ((scheduler_mode
== schedlock_on
)
1033 || (scheduler_mode
== schedlock_step
1034 && (step
|| singlestep_breakpoints_inserted_p
)))
1036 /* User-settable 'scheduler' mode requires solo thread resume. */
1037 resume_ptid
= inferior_ptid
;
1040 if (gdbarch_cannot_step_breakpoint (gdbarch
))
1042 /* Most targets can step a breakpoint instruction, thus
1043 executing it normally. But if this one cannot, just
1044 continue and we will hit it anyway. */
1045 if (step
&& breakpoint_inserted_here_p (pc
))
1050 && use_displaced_stepping (gdbarch
)
1051 && stepping_over_breakpoint
)
1053 struct regcache
*resume_regcache
= get_thread_regcache (resume_ptid
);
1054 CORE_ADDR actual_pc
= regcache_read_pc (resume_regcache
);
1057 fprintf_unfiltered (gdb_stdlog
, "displaced: run 0x%s: ",
1058 paddr_nz (actual_pc
));
1059 read_memory (actual_pc
, buf
, sizeof (buf
));
1060 displaced_step_dump_bytes (gdb_stdlog
, buf
, sizeof (buf
));
1063 target_resume (resume_ptid
, step
, sig
);
1066 discard_cleanups (old_cleanups
);
1071 /* Clear out all variables saying what to do when inferior is continued.
1072 First do this, then set the ones you want, then call `proceed'. */
1075 clear_proceed_status (void)
1077 stepping_over_breakpoint
= 0;
1078 step_range_start
= 0;
1080 step_frame_id
= null_frame_id
;
1081 step_over_calls
= STEP_OVER_UNDEBUGGABLE
;
1082 stop_after_trap
= 0;
1083 stop_soon
= NO_STOP_QUIETLY
;
1084 proceed_to_finish
= 0;
1085 breakpoint_proceeded
= 1; /* We're about to proceed... */
1089 regcache_xfree (stop_registers
);
1090 stop_registers
= NULL
;
1093 /* Discard any remaining commands or status from previous stop. */
1094 bpstat_clear (&stop_bpstat
);
1097 /* This should be suitable for any targets that support threads. */
1100 prepare_to_proceed (int step
)
1103 struct target_waitstatus wait_status
;
1105 /* Get the last target status returned by target_wait(). */
1106 get_last_target_status (&wait_ptid
, &wait_status
);
1108 /* Make sure we were stopped at a breakpoint. */
1109 if (wait_status
.kind
!= TARGET_WAITKIND_STOPPED
1110 || wait_status
.value
.sig
!= TARGET_SIGNAL_TRAP
)
1115 /* Switched over from WAIT_PID. */
1116 if (!ptid_equal (wait_ptid
, minus_one_ptid
)
1117 && !ptid_equal (inferior_ptid
, wait_ptid
))
1119 struct regcache
*regcache
= get_thread_regcache (wait_ptid
);
1121 if (breakpoint_here_p (regcache_read_pc (regcache
)))
1123 /* If stepping, remember current thread to switch back to. */
1125 deferred_step_ptid
= inferior_ptid
;
1127 /* Switch back to WAIT_PID thread. */
1128 switch_to_thread (wait_ptid
);
1130 /* We return 1 to indicate that there is a breakpoint here,
1131 so we need to step over it before continuing to avoid
1132 hitting it straight away. */
1140 /* Record the pc of the program the last time it stopped. This is
1141 just used internally by wait_for_inferior, but need to be preserved
1142 over calls to it and cleared when the inferior is started. */
1143 static CORE_ADDR prev_pc
;
1145 /* Basic routine for continuing the program in various fashions.
1147 ADDR is the address to resume at, or -1 for resume where stopped.
1148 SIGGNAL is the signal to give it, or 0 for none,
1149 or -1 for act according to how it stopped.
1150 STEP is nonzero if should trap after one instruction.
1151 -1 means return after that and print nothing.
1152 You should probably set various step_... variables
1153 before calling here, if you are stepping.
1155 You should call clear_proceed_status before calling proceed. */
1158 proceed (CORE_ADDR addr
, enum target_signal siggnal
, int step
)
1160 struct regcache
*regcache
= get_current_regcache ();
1161 struct gdbarch
*gdbarch
= get_regcache_arch (regcache
);
1162 CORE_ADDR pc
= regcache_read_pc (regcache
);
1166 step_start_function
= find_pc_function (pc
);
1168 stop_after_trap
= 1;
1170 if (addr
== (CORE_ADDR
) -1)
1172 if (pc
== stop_pc
&& breakpoint_here_p (pc
))
1173 /* There is a breakpoint at the address we will resume at,
1174 step one instruction before inserting breakpoints so that
1175 we do not stop right away (and report a second hit at this
1178 else if (gdbarch_single_step_through_delay_p (gdbarch
)
1179 && gdbarch_single_step_through_delay (gdbarch
,
1180 get_current_frame ()))
1181 /* We stepped onto an instruction that needs to be stepped
1182 again before re-inserting the breakpoint, do so. */
1187 regcache_write_pc (regcache
, addr
);
1191 fprintf_unfiltered (gdb_stdlog
,
1192 "infrun: proceed (addr=0x%s, signal=%d, step=%d)\n",
1193 paddr_nz (addr
), siggnal
, step
);
1195 /* In a multi-threaded task we may select another thread
1196 and then continue or step.
1198 But if the old thread was stopped at a breakpoint, it
1199 will immediately cause another breakpoint stop without
1200 any execution (i.e. it will report a breakpoint hit
1201 incorrectly). So we must step over it first.
1203 prepare_to_proceed checks the current thread against the thread
1204 that reported the most recent event. If a step-over is required
1205 it returns TRUE and sets the current thread to the old thread. */
1206 if (prepare_to_proceed (step
))
1211 stepping_over_breakpoint
= 1;
1212 /* If displaced stepping is enabled, we can step over the
1213 breakpoint without hitting it, so leave all breakpoints
1214 inserted. Otherwise we need to disable all breakpoints, step
1215 one instruction, and then re-add them when that step is
1217 if (!use_displaced_stepping (gdbarch
))
1218 remove_breakpoints ();
1221 /* We can insert breakpoints if we're not trying to step over one,
1222 or if we are stepping over one but we're using displaced stepping
1224 if (! stepping_over_breakpoint
|| use_displaced_stepping (gdbarch
))
1225 insert_breakpoints ();
1227 if (siggnal
!= TARGET_SIGNAL_DEFAULT
)
1228 stop_signal
= siggnal
;
1229 /* If this signal should not be seen by program,
1230 give it zero. Used for debugging signals. */
1231 else if (!signal_program
[stop_signal
])
1232 stop_signal
= TARGET_SIGNAL_0
;
1234 annotate_starting ();
1236 /* Make sure that output from GDB appears before output from the
1238 gdb_flush (gdb_stdout
);
1240 /* Refresh prev_pc value just prior to resuming. This used to be
1241 done in stop_stepping, however, setting prev_pc there did not handle
1242 scenarios such as inferior function calls or returning from
1243 a function via the return command. In those cases, the prev_pc
1244 value was not set properly for subsequent commands. The prev_pc value
1245 is used to initialize the starting line number in the ecs. With an
1246 invalid value, the gdb next command ends up stopping at the position
1247 represented by the next line table entry past our start position.
1248 On platforms that generate one line table entry per line, this
1249 is not a problem. However, on the ia64, the compiler generates
1250 extraneous line table entries that do not increase the line number.
1251 When we issue the gdb next command on the ia64 after an inferior call
1252 or a return command, we often end up a few instructions forward, still
1253 within the original line we started.
1255 An attempt was made to have init_execution_control_state () refresh
1256 the prev_pc value before calculating the line number. This approach
1257 did not work because on platforms that use ptrace, the pc register
1258 cannot be read unless the inferior is stopped. At that point, we
1259 are not guaranteed the inferior is stopped and so the regcache_read_pc ()
1260 call can fail. Setting the prev_pc value here ensures the value is
1261 updated correctly when the inferior is stopped. */
1262 prev_pc
= regcache_read_pc (get_current_regcache ());
1264 /* Resume inferior. */
1265 resume (oneproc
|| step
|| bpstat_should_step (), stop_signal
);
1267 /* Wait for it to stop (if not standalone)
1268 and in any case decode why it stopped, and act accordingly. */
1269 /* Do this only if we are not using the event loop, or if the target
1270 does not support asynchronous execution. */
1271 if (!target_can_async_p ())
1273 wait_for_inferior (0);
1279 /* Start remote-debugging of a machine over a serial link. */
1282 start_remote (int from_tty
)
1284 init_wait_for_inferior ();
1285 stop_soon
= STOP_QUIETLY_REMOTE
;
1286 stepping_over_breakpoint
= 0;
1288 /* Always go on waiting for the target, regardless of the mode. */
1289 /* FIXME: cagney/1999-09-23: At present it isn't possible to
1290 indicate to wait_for_inferior that a target should timeout if
1291 nothing is returned (instead of just blocking). Because of this,
1292 targets expecting an immediate response need to, internally, set
1293 things up so that the target_wait() is forced to eventually
1295 /* FIXME: cagney/1999-09-24: It isn't possible for target_open() to
1296 differentiate to its caller what the state of the target is after
1297 the initial open has been performed. Here we're assuming that
1298 the target has stopped. It should be possible to eventually have
1299 target_open() return to the caller an indication that the target
1300 is currently running and GDB state should be set to the same as
1301 for an async run. */
1302 wait_for_inferior (0);
1304 /* Now that the inferior has stopped, do any bookkeeping like
1305 loading shared libraries. We want to do this before normal_stop,
1306 so that the displayed frame is up to date. */
1307 post_create_inferior (¤t_target
, from_tty
);
1312 /* Initialize static vars when a new inferior begins. */
1315 init_wait_for_inferior (void)
1317 /* These are meaningless until the first time through wait_for_inferior. */
1320 breakpoint_init_inferior (inf_starting
);
1322 /* Don't confuse first call to proceed(). */
1323 stop_signal
= TARGET_SIGNAL_0
;
1325 /* The first resume is not following a fork/vfork/exec. */
1326 pending_follow
.kind
= TARGET_WAITKIND_SPURIOUS
; /* I.e., none. */
1328 clear_proceed_status ();
1330 stepping_past_singlestep_breakpoint
= 0;
1331 deferred_step_ptid
= null_ptid
;
1333 target_last_wait_ptid
= minus_one_ptid
;
1335 displaced_step_clear ();
1339 /* This enum encodes possible reasons for doing a target_wait, so that
1340 wfi can call target_wait in one place. (Ultimately the call will be
1341 moved out of the infinite loop entirely.) */
1345 infwait_normal_state
,
1346 infwait_thread_hop_state
,
1347 infwait_step_watch_state
,
1348 infwait_nonstep_watch_state
1351 /* Why did the inferior stop? Used to print the appropriate messages
1352 to the interface from within handle_inferior_event(). */
1353 enum inferior_stop_reason
1355 /* Step, next, nexti, stepi finished. */
1357 /* Inferior terminated by signal. */
1359 /* Inferior exited. */
1361 /* Inferior received signal, and user asked to be notified. */
1365 /* This structure contains what used to be local variables in
1366 wait_for_inferior. Probably many of them can return to being
1367 locals in handle_inferior_event. */
1369 struct execution_control_state
1371 struct target_waitstatus ws
;
1372 struct target_waitstatus
*wp
;
1373 /* Should we step over breakpoint next time keep_going
1375 int stepping_over_breakpoint
;
1377 CORE_ADDR stop_func_start
;
1378 CORE_ADDR stop_func_end
;
1379 char *stop_func_name
;
1380 struct symtab_and_line sal
;
1382 struct symtab
*current_symtab
;
1384 ptid_t saved_inferior_ptid
;
1385 int step_after_step_resume_breakpoint
;
1386 int stepping_through_solib_after_catch
;
1387 bpstat stepping_through_solib_catchpoints
;
1388 int new_thread_event
;
1389 struct target_waitstatus tmpstatus
;
1390 enum infwait_states infwait_state
;
1395 void init_execution_control_state (struct execution_control_state
*ecs
);
1397 void handle_inferior_event (struct execution_control_state
*ecs
);
1399 static void step_into_function (struct execution_control_state
*ecs
);
1400 static void insert_step_resume_breakpoint_at_frame (struct frame_info
*step_frame
);
1401 static void insert_step_resume_breakpoint_at_caller (struct frame_info
*);
1402 static void insert_step_resume_breakpoint_at_sal (struct symtab_and_line sr_sal
,
1403 struct frame_id sr_id
);
1404 static void insert_longjmp_resume_breakpoint (CORE_ADDR
);
1406 static void stop_stepping (struct execution_control_state
*ecs
);
1407 static void prepare_to_wait (struct execution_control_state
*ecs
);
1408 static void keep_going (struct execution_control_state
*ecs
);
1409 static void print_stop_reason (enum inferior_stop_reason stop_reason
,
1412 /* Wait for control to return from inferior to debugger.
1414 If TREAT_EXEC_AS_SIGTRAP is non-zero, then handle EXEC signals
1415 as if they were SIGTRAP signals. This can be useful during
1416 the startup sequence on some targets such as HP/UX, where
1417 we receive an EXEC event instead of the expected SIGTRAP.
1419 If inferior gets a signal, we may decide to start it up again
1420 instead of returning. That is why there is a loop in this function.
1421 When this function actually returns it means the inferior
1422 should be left stopped and GDB should read more commands. */
1425 wait_for_inferior (int treat_exec_as_sigtrap
)
1427 struct cleanup
*old_cleanups
;
1428 struct execution_control_state ecss
;
1429 struct execution_control_state
*ecs
;
1433 (gdb_stdlog
, "infrun: wait_for_inferior (treat_exec_as_sigtrap=%d)\n",
1434 treat_exec_as_sigtrap
);
1436 old_cleanups
= make_cleanup (delete_step_resume_breakpoint
,
1437 &step_resume_breakpoint
);
1439 /* wfi still stays in a loop, so it's OK just to take the address of
1440 a local to get the ecs pointer. */
1443 /* Fill in with reasonable starting values. */
1444 init_execution_control_state (ecs
);
1446 /* We'll update this if & when we switch to a new thread. */
1447 previous_inferior_ptid
= inferior_ptid
;
1449 overlay_cache_invalid
= 1;
1451 /* We have to invalidate the registers BEFORE calling target_wait
1452 because they can be loaded from the target while in target_wait.
1453 This makes remote debugging a bit more efficient for those
1454 targets that provide critical registers as part of their normal
1455 status mechanism. */
1457 registers_changed ();
1461 if (deprecated_target_wait_hook
)
1462 ecs
->ptid
= deprecated_target_wait_hook (ecs
->waiton_ptid
, ecs
->wp
);
1464 ecs
->ptid
= target_wait (ecs
->waiton_ptid
, ecs
->wp
);
1466 if (treat_exec_as_sigtrap
&& ecs
->ws
.kind
== TARGET_WAITKIND_EXECD
)
1468 xfree (ecs
->ws
.value
.execd_pathname
);
1469 ecs
->ws
.kind
= TARGET_WAITKIND_STOPPED
;
1470 ecs
->ws
.value
.sig
= TARGET_SIGNAL_TRAP
;
1473 /* Now figure out what to do with the result of the result. */
1474 handle_inferior_event (ecs
);
1476 if (!ecs
->wait_some_more
)
1479 do_cleanups (old_cleanups
);
1482 /* Asynchronous version of wait_for_inferior. It is called by the
1483 event loop whenever a change of state is detected on the file
1484 descriptor corresponding to the target. It can be called more than
1485 once to complete a single execution command. In such cases we need
1486 to keep the state in a global variable ASYNC_ECSS. If it is the
1487 last time that this function is called for a single execution
1488 command, then report to the user that the inferior has stopped, and
1489 do the necessary cleanups. */
1491 struct execution_control_state async_ecss
;
1492 struct execution_control_state
*async_ecs
;
1495 fetch_inferior_event (void *client_data
)
1497 static struct cleanup
*old_cleanups
;
1499 async_ecs
= &async_ecss
;
1501 if (!async_ecs
->wait_some_more
)
1503 /* Fill in with reasonable starting values. */
1504 init_execution_control_state (async_ecs
);
1506 /* We'll update this if & when we switch to a new thread. */
1507 previous_inferior_ptid
= inferior_ptid
;
1509 overlay_cache_invalid
= 1;
1511 /* We have to invalidate the registers BEFORE calling target_wait
1512 because they can be loaded from the target while in target_wait.
1513 This makes remote debugging a bit more efficient for those
1514 targets that provide critical registers as part of their normal
1515 status mechanism. */
1517 registers_changed ();
1520 if (deprecated_target_wait_hook
)
1522 deprecated_target_wait_hook (async_ecs
->waiton_ptid
, async_ecs
->wp
);
1524 async_ecs
->ptid
= target_wait (async_ecs
->waiton_ptid
, async_ecs
->wp
);
1526 /* Now figure out what to do with the result of the result. */
1527 handle_inferior_event (async_ecs
);
1529 if (!async_ecs
->wait_some_more
)
1531 delete_step_resume_breakpoint (&step_resume_breakpoint
);
1534 if (step_multi
&& stop_step
)
1535 inferior_event_handler (INF_EXEC_CONTINUE
, NULL
);
1537 inferior_event_handler (INF_EXEC_COMPLETE
, NULL
);
1541 /* Prepare an execution control state for looping through a
1542 wait_for_inferior-type loop. */
1545 init_execution_control_state (struct execution_control_state
*ecs
)
1547 ecs
->stepping_over_breakpoint
= 0;
1548 ecs
->random_signal
= 0;
1549 ecs
->step_after_step_resume_breakpoint
= 0;
1550 ecs
->stepping_through_solib_after_catch
= 0;
1551 ecs
->stepping_through_solib_catchpoints
= NULL
;
1552 ecs
->sal
= find_pc_line (prev_pc
, 0);
1553 ecs
->current_line
= ecs
->sal
.line
;
1554 ecs
->current_symtab
= ecs
->sal
.symtab
;
1555 ecs
->infwait_state
= infwait_normal_state
;
1556 ecs
->waiton_ptid
= pid_to_ptid (-1);
1557 ecs
->wp
= &(ecs
->ws
);
1560 /* Return the cached copy of the last pid/waitstatus returned by
1561 target_wait()/deprecated_target_wait_hook(). The data is actually
1562 cached by handle_inferior_event(), which gets called immediately
1563 after target_wait()/deprecated_target_wait_hook(). */
1566 get_last_target_status (ptid_t
*ptidp
, struct target_waitstatus
*status
)
1568 *ptidp
= target_last_wait_ptid
;
1569 *status
= target_last_waitstatus
;
1573 nullify_last_target_wait_ptid (void)
1575 target_last_wait_ptid
= minus_one_ptid
;
1578 /* Switch thread contexts, maintaining "infrun state". */
1581 context_switch (struct execution_control_state
*ecs
)
1583 /* Caution: it may happen that the new thread (or the old one!)
1584 is not in the thread list. In this case we must not attempt
1585 to "switch context", or we run the risk that our context may
1586 be lost. This may happen as a result of the target module
1587 mishandling thread creation. */
1591 fprintf_unfiltered (gdb_stdlog
, "infrun: Switching context from %s ",
1592 target_pid_to_str (inferior_ptid
));
1593 fprintf_unfiltered (gdb_stdlog
, "to %s\n",
1594 target_pid_to_str (ecs
->ptid
));
1597 if (in_thread_list (inferior_ptid
) && in_thread_list (ecs
->ptid
))
1598 { /* Perform infrun state context switch: */
1599 /* Save infrun state for the old thread. */
1600 save_infrun_state (inferior_ptid
, prev_pc
,
1601 stepping_over_breakpoint
, step_resume_breakpoint
,
1603 step_range_end
, &step_frame_id
,
1604 ecs
->stepping_over_breakpoint
,
1605 ecs
->stepping_through_solib_after_catch
,
1606 ecs
->stepping_through_solib_catchpoints
,
1607 ecs
->current_line
, ecs
->current_symtab
);
1609 /* Load infrun state for the new thread. */
1610 load_infrun_state (ecs
->ptid
, &prev_pc
,
1611 &stepping_over_breakpoint
, &step_resume_breakpoint
,
1613 &step_range_end
, &step_frame_id
,
1614 &ecs
->stepping_over_breakpoint
,
1615 &ecs
->stepping_through_solib_after_catch
,
1616 &ecs
->stepping_through_solib_catchpoints
,
1617 &ecs
->current_line
, &ecs
->current_symtab
);
1620 switch_to_thread (ecs
->ptid
);
1624 adjust_pc_after_break (struct execution_control_state
*ecs
)
1626 struct regcache
*regcache
= get_thread_regcache (ecs
->ptid
);
1627 struct gdbarch
*gdbarch
= get_regcache_arch (regcache
);
1628 CORE_ADDR breakpoint_pc
;
1630 /* If this target does not decrement the PC after breakpoints, then
1631 we have nothing to do. */
1632 if (gdbarch_decr_pc_after_break (gdbarch
) == 0)
1635 /* If we've hit a breakpoint, we'll normally be stopped with SIGTRAP. If
1636 we aren't, just return.
1638 We assume that waitkinds other than TARGET_WAITKIND_STOPPED are not
1639 affected by gdbarch_decr_pc_after_break. Other waitkinds which are
1640 implemented by software breakpoints should be handled through the normal
1643 NOTE drow/2004-01-31: On some targets, breakpoints may generate
1644 different signals (SIGILL or SIGEMT for instance), but it is less
1645 clear where the PC is pointing afterwards. It may not match
1646 gdbarch_decr_pc_after_break. I don't know any specific target that
1647 generates these signals at breakpoints (the code has been in GDB since at
1648 least 1992) so I can not guess how to handle them here.
1650 In earlier versions of GDB, a target with
1651 gdbarch_have_nonsteppable_watchpoint would have the PC after hitting a
1652 watchpoint affected by gdbarch_decr_pc_after_break. I haven't found any
1653 target with both of these set in GDB history, and it seems unlikely to be
1654 correct, so gdbarch_have_nonsteppable_watchpoint is not checked here. */
1656 if (ecs
->ws
.kind
!= TARGET_WAITKIND_STOPPED
)
1659 if (ecs
->ws
.value
.sig
!= TARGET_SIGNAL_TRAP
)
1662 /* Find the location where (if we've hit a breakpoint) the
1663 breakpoint would be. */
1664 breakpoint_pc
= regcache_read_pc (regcache
)
1665 - gdbarch_decr_pc_after_break (gdbarch
);
1667 /* Check whether there actually is a software breakpoint inserted
1668 at that location. */
1669 if (software_breakpoint_inserted_here_p (breakpoint_pc
))
1671 /* When using hardware single-step, a SIGTRAP is reported for both
1672 a completed single-step and a software breakpoint. Need to
1673 differentiate between the two, as the latter needs adjusting
1674 but the former does not.
1676 The SIGTRAP can be due to a completed hardware single-step only if
1677 - we didn't insert software single-step breakpoints
1678 - the thread to be examined is still the current thread
1679 - this thread is currently being stepped
1681 If any of these events did not occur, we must have stopped due
1682 to hitting a software breakpoint, and have to back up to the
1685 As a special case, we could have hardware single-stepped a
1686 software breakpoint. In this case (prev_pc == breakpoint_pc),
1687 we also need to back up to the breakpoint address. */
1689 if (singlestep_breakpoints_inserted_p
1690 || !ptid_equal (ecs
->ptid
, inferior_ptid
)
1691 || !currently_stepping (ecs
)
1692 || prev_pc
== breakpoint_pc
)
1693 regcache_write_pc (regcache
, breakpoint_pc
);
1697 /* Given an execution control state that has been freshly filled in
1698 by an event from the inferior, figure out what it means and take
1699 appropriate action. */
1702 handle_inferior_event (struct execution_control_state
*ecs
)
1704 int sw_single_step_trap_p
= 0;
1705 int stopped_by_watchpoint
;
1706 int stepped_after_stopped_by_watchpoint
= 0;
1708 breakpoint_retire_moribund ();
1710 /* Cache the last pid/waitstatus. */
1711 target_last_wait_ptid
= ecs
->ptid
;
1712 target_last_waitstatus
= *ecs
->wp
;
1714 /* Always clear state belonging to the previous time we stopped. */
1715 stop_stack_dummy
= 0;
1717 adjust_pc_after_break (ecs
);
1719 switch (ecs
->infwait_state
)
1721 case infwait_thread_hop_state
:
1723 fprintf_unfiltered (gdb_stdlog
, "infrun: infwait_thread_hop_state\n");
1724 /* Cancel the waiton_ptid. */
1725 ecs
->waiton_ptid
= pid_to_ptid (-1);
1728 case infwait_normal_state
:
1730 fprintf_unfiltered (gdb_stdlog
, "infrun: infwait_normal_state\n");
1733 case infwait_step_watch_state
:
1735 fprintf_unfiltered (gdb_stdlog
,
1736 "infrun: infwait_step_watch_state\n");
1738 stepped_after_stopped_by_watchpoint
= 1;
1741 case infwait_nonstep_watch_state
:
1743 fprintf_unfiltered (gdb_stdlog
,
1744 "infrun: infwait_nonstep_watch_state\n");
1745 insert_breakpoints ();
1747 /* FIXME-maybe: is this cleaner than setting a flag? Does it
1748 handle things like signals arriving and other things happening
1749 in combination correctly? */
1750 stepped_after_stopped_by_watchpoint
= 1;
1754 internal_error (__FILE__
, __LINE__
, _("bad switch"));
1756 ecs
->infwait_state
= infwait_normal_state
;
1758 reinit_frame_cache ();
1760 /* If it's a new process, add it to the thread database */
1762 ecs
->new_thread_event
= (!ptid_equal (ecs
->ptid
, inferior_ptid
)
1763 && !ptid_equal (ecs
->ptid
, minus_one_ptid
)
1764 && !in_thread_list (ecs
->ptid
));
1766 if (ecs
->ws
.kind
!= TARGET_WAITKIND_EXITED
1767 && ecs
->ws
.kind
!= TARGET_WAITKIND_SIGNALLED
&& ecs
->new_thread_event
)
1768 add_thread (ecs
->ptid
);
1770 switch (ecs
->ws
.kind
)
1772 case TARGET_WAITKIND_LOADED
:
1774 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_LOADED\n");
1775 /* Ignore gracefully during startup of the inferior, as it might
1776 be the shell which has just loaded some objects, otherwise
1777 add the symbols for the newly loaded objects. Also ignore at
1778 the beginning of an attach or remote session; we will query
1779 the full list of libraries once the connection is
1781 if (stop_soon
== NO_STOP_QUIETLY
)
1783 /* Check for any newly added shared libraries if we're
1784 supposed to be adding them automatically. Switch
1785 terminal for any messages produced by
1786 breakpoint_re_set. */
1787 target_terminal_ours_for_output ();
1788 /* NOTE: cagney/2003-11-25: Make certain that the target
1789 stack's section table is kept up-to-date. Architectures,
1790 (e.g., PPC64), use the section table to perform
1791 operations such as address => section name and hence
1792 require the table to contain all sections (including
1793 those found in shared libraries). */
1794 /* NOTE: cagney/2003-11-25: Pass current_target and not
1795 exec_ops to SOLIB_ADD. This is because current GDB is
1796 only tooled to propagate section_table changes out from
1797 the "current_target" (see target_resize_to_sections), and
1798 not up from the exec stratum. This, of course, isn't
1799 right. "infrun.c" should only interact with the
1800 exec/process stratum, instead relying on the target stack
1801 to propagate relevant changes (stop, section table
1802 changed, ...) up to other layers. */
1804 SOLIB_ADD (NULL
, 0, ¤t_target
, auto_solib_add
);
1806 solib_add (NULL
, 0, ¤t_target
, auto_solib_add
);
1808 target_terminal_inferior ();
1810 /* If requested, stop when the dynamic linker notifies
1811 gdb of events. This allows the user to get control
1812 and place breakpoints in initializer routines for
1813 dynamically loaded objects (among other things). */
1814 if (stop_on_solib_events
)
1816 stop_stepping (ecs
);
1820 /* NOTE drow/2007-05-11: This might be a good place to check
1821 for "catch load". */
1824 /* If we are skipping through a shell, or through shared library
1825 loading that we aren't interested in, resume the program. If
1826 we're running the program normally, also resume. But stop if
1827 we're attaching or setting up a remote connection. */
1828 if (stop_soon
== STOP_QUIETLY
|| stop_soon
== NO_STOP_QUIETLY
)
1830 /* Loading of shared libraries might have changed breakpoint
1831 addresses. Make sure new breakpoints are inserted. */
1832 if (stop_soon
== NO_STOP_QUIETLY
1833 && !breakpoints_always_inserted_mode ())
1834 insert_breakpoints ();
1835 resume (0, TARGET_SIGNAL_0
);
1836 prepare_to_wait (ecs
);
1842 case TARGET_WAITKIND_SPURIOUS
:
1844 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_SPURIOUS\n");
1845 resume (0, TARGET_SIGNAL_0
);
1846 prepare_to_wait (ecs
);
1849 case TARGET_WAITKIND_EXITED
:
1851 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_EXITED\n");
1852 target_terminal_ours (); /* Must do this before mourn anyway */
1853 print_stop_reason (EXITED
, ecs
->ws
.value
.integer
);
1855 /* Record the exit code in the convenience variable $_exitcode, so
1856 that the user can inspect this again later. */
1857 set_internalvar (lookup_internalvar ("_exitcode"),
1858 value_from_longest (builtin_type_int
,
1859 (LONGEST
) ecs
->ws
.value
.integer
));
1860 gdb_flush (gdb_stdout
);
1861 target_mourn_inferior ();
1862 singlestep_breakpoints_inserted_p
= 0;
1863 stop_print_frame
= 0;
1864 stop_stepping (ecs
);
1867 case TARGET_WAITKIND_SIGNALLED
:
1869 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_SIGNALLED\n");
1870 stop_print_frame
= 0;
1871 stop_signal
= ecs
->ws
.value
.sig
;
1872 target_terminal_ours (); /* Must do this before mourn anyway */
1874 /* Note: By definition of TARGET_WAITKIND_SIGNALLED, we shouldn't
1875 reach here unless the inferior is dead. However, for years
1876 target_kill() was called here, which hints that fatal signals aren't
1877 really fatal on some systems. If that's true, then some changes
1879 target_mourn_inferior ();
1881 print_stop_reason (SIGNAL_EXITED
, stop_signal
);
1882 singlestep_breakpoints_inserted_p
= 0;
1883 stop_stepping (ecs
);
1886 /* The following are the only cases in which we keep going;
1887 the above cases end in a continue or goto. */
1888 case TARGET_WAITKIND_FORKED
:
1889 case TARGET_WAITKIND_VFORKED
:
1891 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_FORKED\n");
1892 stop_signal
= TARGET_SIGNAL_TRAP
;
1893 pending_follow
.kind
= ecs
->ws
.kind
;
1895 pending_follow
.fork_event
.parent_pid
= PIDGET (ecs
->ptid
);
1896 pending_follow
.fork_event
.child_pid
= ecs
->ws
.value
.related_pid
;
1898 if (!ptid_equal (ecs
->ptid
, inferior_ptid
))
1900 context_switch (ecs
);
1901 reinit_frame_cache ();
1904 stop_pc
= read_pc ();
1906 stop_bpstat
= bpstat_stop_status (stop_pc
, ecs
->ptid
);
1908 ecs
->random_signal
= !bpstat_explains_signal (stop_bpstat
);
1910 /* If no catchpoint triggered for this, then keep going. */
1911 if (ecs
->random_signal
)
1913 stop_signal
= TARGET_SIGNAL_0
;
1917 goto process_event_stop_test
;
1919 case TARGET_WAITKIND_EXECD
:
1921 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_EXECD\n");
1922 stop_signal
= TARGET_SIGNAL_TRAP
;
1924 pending_follow
.execd_pathname
=
1925 savestring (ecs
->ws
.value
.execd_pathname
,
1926 strlen (ecs
->ws
.value
.execd_pathname
));
1928 /* This causes the eventpoints and symbol table to be reset. Must
1929 do this now, before trying to determine whether to stop. */
1930 follow_exec (PIDGET (inferior_ptid
), pending_follow
.execd_pathname
);
1931 xfree (pending_follow
.execd_pathname
);
1933 stop_pc
= regcache_read_pc (get_thread_regcache (ecs
->ptid
));
1934 ecs
->saved_inferior_ptid
= inferior_ptid
;
1935 inferior_ptid
= ecs
->ptid
;
1937 stop_bpstat
= bpstat_stop_status (stop_pc
, ecs
->ptid
);
1939 ecs
->random_signal
= !bpstat_explains_signal (stop_bpstat
);
1940 inferior_ptid
= ecs
->saved_inferior_ptid
;
1942 if (!ptid_equal (ecs
->ptid
, inferior_ptid
))
1944 context_switch (ecs
);
1945 reinit_frame_cache ();
1948 /* If no catchpoint triggered for this, then keep going. */
1949 if (ecs
->random_signal
)
1951 stop_signal
= TARGET_SIGNAL_0
;
1955 goto process_event_stop_test
;
1957 /* Be careful not to try to gather much state about a thread
1958 that's in a syscall. It's frequently a losing proposition. */
1959 case TARGET_WAITKIND_SYSCALL_ENTRY
:
1961 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_SYSCALL_ENTRY\n");
1962 resume (0, TARGET_SIGNAL_0
);
1963 prepare_to_wait (ecs
);
1966 /* Before examining the threads further, step this thread to
1967 get it entirely out of the syscall. (We get notice of the
1968 event when the thread is just on the verge of exiting a
1969 syscall. Stepping one instruction seems to get it back
1971 case TARGET_WAITKIND_SYSCALL_RETURN
:
1973 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_SYSCALL_RETURN\n");
1974 target_resume (ecs
->ptid
, 1, TARGET_SIGNAL_0
);
1975 prepare_to_wait (ecs
);
1978 case TARGET_WAITKIND_STOPPED
:
1980 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_STOPPED\n");
1981 stop_signal
= ecs
->ws
.value
.sig
;
1984 /* We had an event in the inferior, but we are not interested
1985 in handling it at this level. The lower layers have already
1986 done what needs to be done, if anything.
1988 One of the possible circumstances for this is when the
1989 inferior produces output for the console. The inferior has
1990 not stopped, and we are ignoring the event. Another possible
1991 circumstance is any event which the lower level knows will be
1992 reported multiple times without an intervening resume. */
1993 case TARGET_WAITKIND_IGNORE
:
1995 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_IGNORE\n");
1996 prepare_to_wait (ecs
);
2000 /* We may want to consider not doing a resume here in order to give
2001 the user a chance to play with the new thread. It might be good
2002 to make that a user-settable option. */
2004 /* At this point, all threads are stopped (happens automatically in
2005 either the OS or the native code). Therefore we need to continue
2006 all threads in order to make progress. */
2007 if (ecs
->new_thread_event
)
2009 target_resume (RESUME_ALL
, 0, TARGET_SIGNAL_0
);
2010 prepare_to_wait (ecs
);
2014 /* Do we need to clean up the state of a thread that has completed a
2015 displaced single-step? (Doing so usually affects the PC, so do
2016 it here, before we set stop_pc.) */
2017 displaced_step_fixup (ecs
->ptid
, stop_signal
);
2019 stop_pc
= regcache_read_pc (get_thread_regcache (ecs
->ptid
));
2023 fprintf_unfiltered (gdb_stdlog
, "infrun: stop_pc = 0x%s\n",
2024 paddr_nz (stop_pc
));
2025 if (STOPPED_BY_WATCHPOINT (&ecs
->ws
))
2028 fprintf_unfiltered (gdb_stdlog
, "infrun: stopped by watchpoint\n");
2030 if (target_stopped_data_address (¤t_target
, &addr
))
2031 fprintf_unfiltered (gdb_stdlog
,
2032 "infrun: stopped data address = 0x%s\n",
2035 fprintf_unfiltered (gdb_stdlog
,
2036 "infrun: (no data address available)\n");
2040 if (stepping_past_singlestep_breakpoint
)
2042 gdb_assert (singlestep_breakpoints_inserted_p
);
2043 gdb_assert (ptid_equal (singlestep_ptid
, ecs
->ptid
));
2044 gdb_assert (!ptid_equal (singlestep_ptid
, saved_singlestep_ptid
));
2046 stepping_past_singlestep_breakpoint
= 0;
2048 /* We've either finished single-stepping past the single-step
2049 breakpoint, or stopped for some other reason. It would be nice if
2050 we could tell, but we can't reliably. */
2051 if (stop_signal
== TARGET_SIGNAL_TRAP
)
2054 fprintf_unfiltered (gdb_stdlog
, "infrun: stepping_past_singlestep_breakpoint\n");
2055 /* Pull the single step breakpoints out of the target. */
2056 remove_single_step_breakpoints ();
2057 singlestep_breakpoints_inserted_p
= 0;
2059 ecs
->random_signal
= 0;
2061 ecs
->ptid
= saved_singlestep_ptid
;
2062 context_switch (ecs
);
2063 if (deprecated_context_hook
)
2064 deprecated_context_hook (pid_to_thread_id (ecs
->ptid
));
2066 resume (1, TARGET_SIGNAL_0
);
2067 prepare_to_wait (ecs
);
2072 stepping_past_singlestep_breakpoint
= 0;
2074 if (!ptid_equal (deferred_step_ptid
, null_ptid
))
2076 /* If we stopped for some other reason than single-stepping, ignore
2077 the fact that we were supposed to switch back. */
2078 if (stop_signal
== TARGET_SIGNAL_TRAP
)
2081 fprintf_unfiltered (gdb_stdlog
,
2082 "infrun: handling deferred step\n");
2084 /* Pull the single step breakpoints out of the target. */
2085 if (singlestep_breakpoints_inserted_p
)
2087 remove_single_step_breakpoints ();
2088 singlestep_breakpoints_inserted_p
= 0;
2091 /* Note: We do not call context_switch at this point, as the
2092 context is already set up for stepping the original thread. */
2093 switch_to_thread (deferred_step_ptid
);
2094 deferred_step_ptid
= null_ptid
;
2095 /* Suppress spurious "Switching to ..." message. */
2096 previous_inferior_ptid
= inferior_ptid
;
2098 resume (1, TARGET_SIGNAL_0
);
2099 prepare_to_wait (ecs
);
2103 deferred_step_ptid
= null_ptid
;
2106 /* See if a thread hit a thread-specific breakpoint that was meant for
2107 another thread. If so, then step that thread past the breakpoint,
2110 if (stop_signal
== TARGET_SIGNAL_TRAP
)
2112 int thread_hop_needed
= 0;
2114 /* Check if a regular breakpoint has been hit before checking
2115 for a potential single step breakpoint. Otherwise, GDB will
2116 not see this breakpoint hit when stepping onto breakpoints. */
2117 if (regular_breakpoint_inserted_here_p (stop_pc
))
2119 ecs
->random_signal
= 0;
2120 if (!breakpoint_thread_match (stop_pc
, ecs
->ptid
))
2121 thread_hop_needed
= 1;
2123 else if (singlestep_breakpoints_inserted_p
)
2125 /* We have not context switched yet, so this should be true
2126 no matter which thread hit the singlestep breakpoint. */
2127 gdb_assert (ptid_equal (inferior_ptid
, singlestep_ptid
));
2129 fprintf_unfiltered (gdb_stdlog
, "infrun: software single step "
2131 target_pid_to_str (ecs
->ptid
));
2133 ecs
->random_signal
= 0;
2134 /* The call to in_thread_list is necessary because PTIDs sometimes
2135 change when we go from single-threaded to multi-threaded. If
2136 the singlestep_ptid is still in the list, assume that it is
2137 really different from ecs->ptid. */
2138 if (!ptid_equal (singlestep_ptid
, ecs
->ptid
)
2139 && in_thread_list (singlestep_ptid
))
2141 /* If the PC of the thread we were trying to single-step
2142 has changed, discard this event (which we were going
2143 to ignore anyway), and pretend we saw that thread
2144 trap. This prevents us continuously moving the
2145 single-step breakpoint forward, one instruction at a
2146 time. If the PC has changed, then the thread we were
2147 trying to single-step has trapped or been signalled,
2148 but the event has not been reported to GDB yet.
2150 There might be some cases where this loses signal
2151 information, if a signal has arrived at exactly the
2152 same time that the PC changed, but this is the best
2153 we can do with the information available. Perhaps we
2154 should arrange to report all events for all threads
2155 when they stop, or to re-poll the remote looking for
2156 this particular thread (i.e. temporarily enable
2159 CORE_ADDR new_singlestep_pc
2160 = regcache_read_pc (get_thread_regcache (singlestep_ptid
));
2162 if (new_singlestep_pc
!= singlestep_pc
)
2165 fprintf_unfiltered (gdb_stdlog
, "infrun: unexpected thread,"
2166 " but expected thread advanced also\n");
2168 /* The current context still belongs to
2169 singlestep_ptid. Don't swap here, since that's
2170 the context we want to use. Just fudge our
2171 state and continue. */
2172 ecs
->ptid
= singlestep_ptid
;
2173 stop_pc
= new_singlestep_pc
;
2178 fprintf_unfiltered (gdb_stdlog
,
2179 "infrun: unexpected thread\n");
2181 thread_hop_needed
= 1;
2182 stepping_past_singlestep_breakpoint
= 1;
2183 saved_singlestep_ptid
= singlestep_ptid
;
2188 if (thread_hop_needed
)
2190 int remove_status
= 0;
2193 fprintf_unfiltered (gdb_stdlog
, "infrun: thread_hop_needed\n");
2195 /* Saw a breakpoint, but it was hit by the wrong thread.
2198 if (singlestep_breakpoints_inserted_p
)
2200 /* Pull the single step breakpoints out of the target. */
2201 remove_single_step_breakpoints ();
2202 singlestep_breakpoints_inserted_p
= 0;
2205 /* If the arch can displace step, don't remove the
2207 if (!use_displaced_stepping (current_gdbarch
))
2208 remove_status
= remove_breakpoints ();
2210 /* Did we fail to remove breakpoints? If so, try
2211 to set the PC past the bp. (There's at least
2212 one situation in which we can fail to remove
2213 the bp's: On HP-UX's that use ttrace, we can't
2214 change the address space of a vforking child
2215 process until the child exits (well, okay, not
2216 then either :-) or execs. */
2217 if (remove_status
!= 0)
2218 error (_("Cannot step over breakpoint hit in wrong thread"));
2221 if (!ptid_equal (inferior_ptid
, ecs
->ptid
))
2222 context_switch (ecs
);
2223 ecs
->waiton_ptid
= ecs
->ptid
;
2224 ecs
->wp
= &(ecs
->ws
);
2225 ecs
->stepping_over_breakpoint
= 1;
2227 ecs
->infwait_state
= infwait_thread_hop_state
;
2229 registers_changed ();
2233 else if (singlestep_breakpoints_inserted_p
)
2235 sw_single_step_trap_p
= 1;
2236 ecs
->random_signal
= 0;
2240 ecs
->random_signal
= 1;
2242 /* See if something interesting happened to the non-current thread. If
2243 so, then switch to that thread. */
2244 if (!ptid_equal (ecs
->ptid
, inferior_ptid
))
2247 fprintf_unfiltered (gdb_stdlog
, "infrun: context switch\n");
2249 context_switch (ecs
);
2251 if (deprecated_context_hook
)
2252 deprecated_context_hook (pid_to_thread_id (ecs
->ptid
));
2255 if (singlestep_breakpoints_inserted_p
)
2257 /* Pull the single step breakpoints out of the target. */
2258 remove_single_step_breakpoints ();
2259 singlestep_breakpoints_inserted_p
= 0;
2262 if (stepped_after_stopped_by_watchpoint
)
2263 stopped_by_watchpoint
= 0;
2265 stopped_by_watchpoint
= watchpoints_triggered (&ecs
->ws
);
2267 /* If necessary, step over this watchpoint. We'll be back to display
2269 if (stopped_by_watchpoint
2270 && (HAVE_STEPPABLE_WATCHPOINT
2271 || gdbarch_have_nonsteppable_watchpoint (current_gdbarch
)))
2273 /* At this point, we are stopped at an instruction which has
2274 attempted to write to a piece of memory under control of
2275 a watchpoint. The instruction hasn't actually executed
2276 yet. If we were to evaluate the watchpoint expression
2277 now, we would get the old value, and therefore no change
2278 would seem to have occurred.
2280 In order to make watchpoints work `right', we really need
2281 to complete the memory write, and then evaluate the
2282 watchpoint expression. We do this by single-stepping the
2285 It may not be necessary to disable the watchpoint to stop over
2286 it. For example, the PA can (with some kernel cooperation)
2287 single step over a watchpoint without disabling the watchpoint.
2289 It is far more common to need to disable a watchpoint to step
2290 the inferior over it. If we have non-steppable watchpoints,
2291 we must disable the current watchpoint; it's simplest to
2292 disable all watchpoints and breakpoints. */
2294 if (!HAVE_STEPPABLE_WATCHPOINT
)
2295 remove_breakpoints ();
2296 registers_changed ();
2297 target_resume (ecs
->ptid
, 1, TARGET_SIGNAL_0
); /* Single step */
2298 ecs
->waiton_ptid
= ecs
->ptid
;
2299 if (HAVE_STEPPABLE_WATCHPOINT
)
2300 ecs
->infwait_state
= infwait_step_watch_state
;
2302 ecs
->infwait_state
= infwait_nonstep_watch_state
;
2303 prepare_to_wait (ecs
);
2307 ecs
->stop_func_start
= 0;
2308 ecs
->stop_func_end
= 0;
2309 ecs
->stop_func_name
= 0;
2310 /* Don't care about return value; stop_func_start and stop_func_name
2311 will both be 0 if it doesn't work. */
2312 find_pc_partial_function (stop_pc
, &ecs
->stop_func_name
,
2313 &ecs
->stop_func_start
, &ecs
->stop_func_end
);
2314 ecs
->stop_func_start
2315 += gdbarch_deprecated_function_start_offset (current_gdbarch
);
2316 ecs
->stepping_over_breakpoint
= 0;
2317 bpstat_clear (&stop_bpstat
);
2319 stop_print_frame
= 1;
2320 ecs
->random_signal
= 0;
2321 stopped_by_random_signal
= 0;
2323 if (stop_signal
== TARGET_SIGNAL_TRAP
2324 && stepping_over_breakpoint
2325 && gdbarch_single_step_through_delay_p (current_gdbarch
)
2326 && currently_stepping (ecs
))
2328 /* We're trying to step off a breakpoint. Turns out that we're
2329 also on an instruction that needs to be stepped multiple
2330 times before it's been fully executing. E.g., architectures
2331 with a delay slot. It needs to be stepped twice, once for
2332 the instruction and once for the delay slot. */
2333 int step_through_delay
2334 = gdbarch_single_step_through_delay (current_gdbarch
,
2335 get_current_frame ());
2336 if (debug_infrun
&& step_through_delay
)
2337 fprintf_unfiltered (gdb_stdlog
, "infrun: step through delay\n");
2338 if (step_range_end
== 0 && step_through_delay
)
2340 /* The user issued a continue when stopped at a breakpoint.
2341 Set up for another trap and get out of here. */
2342 ecs
->stepping_over_breakpoint
= 1;
2346 else if (step_through_delay
)
2348 /* The user issued a step when stopped at a breakpoint.
2349 Maybe we should stop, maybe we should not - the delay
2350 slot *might* correspond to a line of source. In any
2351 case, don't decide that here, just set
2352 ecs->stepping_over_breakpoint, making sure we
2353 single-step again before breakpoints are re-inserted. */
2354 ecs
->stepping_over_breakpoint
= 1;
2358 /* Look at the cause of the stop, and decide what to do.
2359 The alternatives are:
2360 1) break; to really stop and return to the debugger,
2361 2) drop through to start up again
2362 (set ecs->stepping_over_breakpoint to 1 to single step once)
2363 3) set ecs->random_signal to 1, and the decision between 1 and 2
2364 will be made according to the signal handling tables. */
2366 /* First, distinguish signals caused by the debugger from signals
2367 that have to do with the program's own actions. Note that
2368 breakpoint insns may cause SIGTRAP or SIGILL or SIGEMT, depending
2369 on the operating system version. Here we detect when a SIGILL or
2370 SIGEMT is really a breakpoint and change it to SIGTRAP. We do
2371 something similar for SIGSEGV, since a SIGSEGV will be generated
2372 when we're trying to execute a breakpoint instruction on a
2373 non-executable stack. This happens for call dummy breakpoints
2374 for architectures like SPARC that place call dummies on the
2377 If we're doing a displaced step past a breakpoint, then the
2378 breakpoint is always inserted at the original instruction;
2379 non-standard signals can't be explained by the breakpoint. */
2380 if (stop_signal
== TARGET_SIGNAL_TRAP
2381 || (! stepping_over_breakpoint
2382 && breakpoint_inserted_here_p (stop_pc
)
2383 && (stop_signal
== TARGET_SIGNAL_ILL
2384 || stop_signal
== TARGET_SIGNAL_SEGV
2385 || stop_signal
== TARGET_SIGNAL_EMT
))
2386 || stop_soon
== STOP_QUIETLY
|| stop_soon
== STOP_QUIETLY_NO_SIGSTOP
2387 || stop_soon
== STOP_QUIETLY_REMOTE
)
2389 if (stop_signal
== TARGET_SIGNAL_TRAP
&& stop_after_trap
)
2392 fprintf_unfiltered (gdb_stdlog
, "infrun: stopped\n");
2393 stop_print_frame
= 0;
2394 stop_stepping (ecs
);
2398 /* This is originated from start_remote(), start_inferior() and
2399 shared libraries hook functions. */
2400 if (stop_soon
== STOP_QUIETLY
|| stop_soon
== STOP_QUIETLY_REMOTE
)
2403 fprintf_unfiltered (gdb_stdlog
, "infrun: quietly stopped\n");
2404 stop_stepping (ecs
);
2408 /* This originates from attach_command(). We need to overwrite
2409 the stop_signal here, because some kernels don't ignore a
2410 SIGSTOP in a subsequent ptrace(PTRACE_CONT,SIGSTOP) call.
2411 See more comments in inferior.h. On the other hand, if we
2412 get a non-SIGSTOP, report it to the user - assume the backend
2413 will handle the SIGSTOP if it should show up later. */
2414 if (stop_soon
== STOP_QUIETLY_NO_SIGSTOP
2415 && stop_signal
== TARGET_SIGNAL_STOP
)
2417 stop_stepping (ecs
);
2418 stop_signal
= TARGET_SIGNAL_0
;
2422 /* See if there is a breakpoint at the current PC. */
2423 stop_bpstat
= bpstat_stop_status (stop_pc
, ecs
->ptid
);
2425 /* Following in case break condition called a
2427 stop_print_frame
= 1;
2429 /* NOTE: cagney/2003-03-29: These two checks for a random signal
2430 at one stage in the past included checks for an inferior
2431 function call's call dummy's return breakpoint. The original
2432 comment, that went with the test, read:
2434 ``End of a stack dummy. Some systems (e.g. Sony news) give
2435 another signal besides SIGTRAP, so check here as well as
2438 If someone ever tries to get get call dummys on a
2439 non-executable stack to work (where the target would stop
2440 with something like a SIGSEGV), then those tests might need
2441 to be re-instated. Given, however, that the tests were only
2442 enabled when momentary breakpoints were not being used, I
2443 suspect that it won't be the case.
2445 NOTE: kettenis/2004-02-05: Indeed such checks don't seem to
2446 be necessary for call dummies on a non-executable stack on
2449 if (stop_signal
== TARGET_SIGNAL_TRAP
)
2451 = !(bpstat_explains_signal (stop_bpstat
)
2452 || stepping_over_breakpoint
2453 || (step_range_end
&& step_resume_breakpoint
== NULL
));
2456 ecs
->random_signal
= !bpstat_explains_signal (stop_bpstat
);
2457 if (!ecs
->random_signal
)
2458 stop_signal
= TARGET_SIGNAL_TRAP
;
2462 /* When we reach this point, we've pretty much decided
2463 that the reason for stopping must've been a random
2464 (unexpected) signal. */
2467 ecs
->random_signal
= 1;
2469 process_event_stop_test
:
2470 /* For the program's own signals, act according to
2471 the signal handling tables. */
2473 if (ecs
->random_signal
)
2475 /* Signal not for debugging purposes. */
2479 fprintf_unfiltered (gdb_stdlog
, "infrun: random signal %d\n", stop_signal
);
2481 stopped_by_random_signal
= 1;
2483 if (signal_print
[stop_signal
])
2486 target_terminal_ours_for_output ();
2487 print_stop_reason (SIGNAL_RECEIVED
, stop_signal
);
2489 if (signal_stop_state (stop_signal
))
2491 stop_stepping (ecs
);
2494 /* If not going to stop, give terminal back
2495 if we took it away. */
2497 target_terminal_inferior ();
2499 /* Clear the signal if it should not be passed. */
2500 if (signal_program
[stop_signal
] == 0)
2501 stop_signal
= TARGET_SIGNAL_0
;
2503 if (prev_pc
== read_pc ()
2504 && stepping_over_breakpoint
2505 && step_resume_breakpoint
== NULL
)
2507 /* We were just starting a new sequence, attempting to
2508 single-step off of a breakpoint and expecting a SIGTRAP.
2509 Instead this signal arrives. This signal will take us out
2510 of the stepping range so GDB needs to remember to, when
2511 the signal handler returns, resume stepping off that
2513 /* To simplify things, "continue" is forced to use the same
2514 code paths as single-step - set a breakpoint at the
2515 signal return address and then, once hit, step off that
2518 fprintf_unfiltered (gdb_stdlog
,
2519 "infrun: signal arrived while stepping over "
2522 insert_step_resume_breakpoint_at_frame (get_current_frame ());
2523 ecs
->step_after_step_resume_breakpoint
= 1;
2528 if (step_range_end
!= 0
2529 && stop_signal
!= TARGET_SIGNAL_0
2530 && stop_pc
>= step_range_start
&& stop_pc
< step_range_end
2531 && frame_id_eq (get_frame_id (get_current_frame ()),
2533 && step_resume_breakpoint
== NULL
)
2535 /* The inferior is about to take a signal that will take it
2536 out of the single step range. Set a breakpoint at the
2537 current PC (which is presumably where the signal handler
2538 will eventually return) and then allow the inferior to
2541 Note that this is only needed for a signal delivered
2542 while in the single-step range. Nested signals aren't a
2543 problem as they eventually all return. */
2545 fprintf_unfiltered (gdb_stdlog
,
2546 "infrun: signal may take us out of "
2547 "single-step range\n");
2549 insert_step_resume_breakpoint_at_frame (get_current_frame ());
2554 /* Note: step_resume_breakpoint may be non-NULL. This occures
2555 when either there's a nested signal, or when there's a
2556 pending signal enabled just as the signal handler returns
2557 (leaving the inferior at the step-resume-breakpoint without
2558 actually executing it). Either way continue until the
2559 breakpoint is really hit. */
2564 /* Handle cases caused by hitting a breakpoint. */
2566 CORE_ADDR jmp_buf_pc
;
2567 struct bpstat_what what
;
2569 what
= bpstat_what (stop_bpstat
);
2571 if (what
.call_dummy
)
2573 stop_stack_dummy
= 1;
2576 switch (what
.main_action
)
2578 case BPSTAT_WHAT_SET_LONGJMP_RESUME
:
2579 /* If we hit the breakpoint at longjmp while stepping, we
2580 install a momentary breakpoint at the target of the
2584 fprintf_unfiltered (gdb_stdlog
,
2585 "infrun: BPSTAT_WHAT_SET_LONGJMP_RESUME\n");
2587 ecs
->stepping_over_breakpoint
= 1;
2589 if (!gdbarch_get_longjmp_target_p (current_gdbarch
)
2590 || !gdbarch_get_longjmp_target (current_gdbarch
,
2591 get_current_frame (), &jmp_buf_pc
))
2594 fprintf_unfiltered (gdb_stdlog
, "\
2595 infrun: BPSTAT_WHAT_SET_LONGJMP_RESUME (!gdbarch_get_longjmp_target)\n");
2600 /* We're going to replace the current step-resume breakpoint
2601 with a longjmp-resume breakpoint. */
2602 if (step_resume_breakpoint
!= NULL
)
2603 delete_step_resume_breakpoint (&step_resume_breakpoint
);
2605 /* Insert a breakpoint at resume address. */
2606 insert_longjmp_resume_breakpoint (jmp_buf_pc
);
2611 case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME
:
2613 fprintf_unfiltered (gdb_stdlog
,
2614 "infrun: BPSTAT_WHAT_CLEAR_LONGJMP_RESUME\n");
2616 gdb_assert (step_resume_breakpoint
!= NULL
);
2617 delete_step_resume_breakpoint (&step_resume_breakpoint
);
2620 print_stop_reason (END_STEPPING_RANGE
, 0);
2621 stop_stepping (ecs
);
2624 case BPSTAT_WHAT_SINGLE
:
2626 fprintf_unfiltered (gdb_stdlog
, "infrun: BPSTAT_WHAT_SINGLE\n");
2627 ecs
->stepping_over_breakpoint
= 1;
2628 /* Still need to check other stuff, at least the case
2629 where we are stepping and step out of the right range. */
2632 case BPSTAT_WHAT_STOP_NOISY
:
2634 fprintf_unfiltered (gdb_stdlog
, "infrun: BPSTAT_WHAT_STOP_NOISY\n");
2635 stop_print_frame
= 1;
2637 /* We are about to nuke the step_resume_breakpointt via the
2638 cleanup chain, so no need to worry about it here. */
2640 stop_stepping (ecs
);
2643 case BPSTAT_WHAT_STOP_SILENT
:
2645 fprintf_unfiltered (gdb_stdlog
, "infrun: BPSTAT_WHAT_STOP_SILENT\n");
2646 stop_print_frame
= 0;
2648 /* We are about to nuke the step_resume_breakpoin via the
2649 cleanup chain, so no need to worry about it here. */
2651 stop_stepping (ecs
);
2654 case BPSTAT_WHAT_STEP_RESUME
:
2655 /* This proably demands a more elegant solution, but, yeah
2658 This function's use of the simple variable
2659 step_resume_breakpoint doesn't seem to accomodate
2660 simultaneously active step-resume bp's, although the
2661 breakpoint list certainly can.
2663 If we reach here and step_resume_breakpoint is already
2664 NULL, then apparently we have multiple active
2665 step-resume bp's. We'll just delete the breakpoint we
2666 stopped at, and carry on.
2668 Correction: what the code currently does is delete a
2669 step-resume bp, but it makes no effort to ensure that
2670 the one deleted is the one currently stopped at. MVS */
2673 fprintf_unfiltered (gdb_stdlog
, "infrun: BPSTAT_WHAT_STEP_RESUME\n");
2675 if (step_resume_breakpoint
== NULL
)
2677 step_resume_breakpoint
=
2678 bpstat_find_step_resume_breakpoint (stop_bpstat
);
2680 delete_step_resume_breakpoint (&step_resume_breakpoint
);
2681 if (ecs
->step_after_step_resume_breakpoint
)
2683 /* Back when the step-resume breakpoint was inserted, we
2684 were trying to single-step off a breakpoint. Go back
2686 ecs
->step_after_step_resume_breakpoint
= 0;
2687 ecs
->stepping_over_breakpoint
= 1;
2693 case BPSTAT_WHAT_CHECK_SHLIBS
:
2694 case BPSTAT_WHAT_CHECK_SHLIBS_RESUME_FROM_HOOK
:
2697 fprintf_unfiltered (gdb_stdlog
, "infrun: BPSTAT_WHAT_CHECK_SHLIBS\n");
2699 /* Check for any newly added shared libraries if we're
2700 supposed to be adding them automatically. Switch
2701 terminal for any messages produced by
2702 breakpoint_re_set. */
2703 target_terminal_ours_for_output ();
2704 /* NOTE: cagney/2003-11-25: Make certain that the target
2705 stack's section table is kept up-to-date. Architectures,
2706 (e.g., PPC64), use the section table to perform
2707 operations such as address => section name and hence
2708 require the table to contain all sections (including
2709 those found in shared libraries). */
2710 /* NOTE: cagney/2003-11-25: Pass current_target and not
2711 exec_ops to SOLIB_ADD. This is because current GDB is
2712 only tooled to propagate section_table changes out from
2713 the "current_target" (see target_resize_to_sections), and
2714 not up from the exec stratum. This, of course, isn't
2715 right. "infrun.c" should only interact with the
2716 exec/process stratum, instead relying on the target stack
2717 to propagate relevant changes (stop, section table
2718 changed, ...) up to other layers. */
2720 SOLIB_ADD (NULL
, 0, ¤t_target
, auto_solib_add
);
2722 solib_add (NULL
, 0, ¤t_target
, auto_solib_add
);
2724 target_terminal_inferior ();
2726 /* If requested, stop when the dynamic linker notifies
2727 gdb of events. This allows the user to get control
2728 and place breakpoints in initializer routines for
2729 dynamically loaded objects (among other things). */
2730 if (stop_on_solib_events
|| stop_stack_dummy
)
2732 stop_stepping (ecs
);
2736 /* If we stopped due to an explicit catchpoint, then the
2737 (see above) call to SOLIB_ADD pulled in any symbols
2738 from a newly-loaded library, if appropriate.
2740 We do want the inferior to stop, but not where it is
2741 now, which is in the dynamic linker callback. Rather,
2742 we would like it stop in the user's program, just after
2743 the call that caused this catchpoint to trigger. That
2744 gives the user a more useful vantage from which to
2745 examine their program's state. */
2746 else if (what
.main_action
2747 == BPSTAT_WHAT_CHECK_SHLIBS_RESUME_FROM_HOOK
)
2749 /* ??rehrauer: If I could figure out how to get the
2750 right return PC from here, we could just set a temp
2751 breakpoint and resume. I'm not sure we can without
2752 cracking open the dld's shared libraries and sniffing
2753 their unwind tables and text/data ranges, and that's
2754 not a terribly portable notion.
2756 Until that time, we must step the inferior out of the
2757 dld callback, and also out of the dld itself (and any
2758 code or stubs in libdld.sl, such as "shl_load" and
2759 friends) until we reach non-dld code. At that point,
2760 we can stop stepping. */
2761 bpstat_get_triggered_catchpoints (stop_bpstat
,
2763 stepping_through_solib_catchpoints
);
2764 ecs
->stepping_through_solib_after_catch
= 1;
2766 /* Be sure to lift all breakpoints, so the inferior does
2767 actually step past this point... */
2768 ecs
->stepping_over_breakpoint
= 1;
2773 /* We want to step over this breakpoint, then keep going. */
2774 ecs
->stepping_over_breakpoint
= 1;
2780 case BPSTAT_WHAT_LAST
:
2781 /* Not a real code, but listed here to shut up gcc -Wall. */
2783 case BPSTAT_WHAT_KEEP_CHECKING
:
2788 /* We come here if we hit a breakpoint but should not
2789 stop for it. Possibly we also were stepping
2790 and should stop for that. So fall through and
2791 test for stepping. But, if not stepping,
2794 /* Are we stepping to get the inferior out of the dynamic linker's
2795 hook (and possibly the dld itself) after catching a shlib
2797 if (ecs
->stepping_through_solib_after_catch
)
2799 #if defined(SOLIB_ADD)
2800 /* Have we reached our destination? If not, keep going. */
2801 if (SOLIB_IN_DYNAMIC_LINKER (PIDGET (ecs
->ptid
), stop_pc
))
2804 fprintf_unfiltered (gdb_stdlog
, "infrun: stepping in dynamic linker\n");
2805 ecs
->stepping_over_breakpoint
= 1;
2811 fprintf_unfiltered (gdb_stdlog
, "infrun: step past dynamic linker\n");
2812 /* Else, stop and report the catchpoint(s) whose triggering
2813 caused us to begin stepping. */
2814 ecs
->stepping_through_solib_after_catch
= 0;
2815 bpstat_clear (&stop_bpstat
);
2816 stop_bpstat
= bpstat_copy (ecs
->stepping_through_solib_catchpoints
);
2817 bpstat_clear (&ecs
->stepping_through_solib_catchpoints
);
2818 stop_print_frame
= 1;
2819 stop_stepping (ecs
);
2823 if (step_resume_breakpoint
)
2826 fprintf_unfiltered (gdb_stdlog
,
2827 "infrun: step-resume breakpoint is inserted\n");
2829 /* Having a step-resume breakpoint overrides anything
2830 else having to do with stepping commands until
2831 that breakpoint is reached. */
2836 if (step_range_end
== 0)
2839 fprintf_unfiltered (gdb_stdlog
, "infrun: no stepping, continue\n");
2840 /* Likewise if we aren't even stepping. */
2845 /* If stepping through a line, keep going if still within it.
2847 Note that step_range_end is the address of the first instruction
2848 beyond the step range, and NOT the address of the last instruction
2850 if (stop_pc
>= step_range_start
&& stop_pc
< step_range_end
)
2853 fprintf_unfiltered (gdb_stdlog
, "infrun: stepping inside range [0x%s-0x%s]\n",
2854 paddr_nz (step_range_start
),
2855 paddr_nz (step_range_end
));
2860 /* We stepped out of the stepping range. */
2862 /* If we are stepping at the source level and entered the runtime
2863 loader dynamic symbol resolution code, we keep on single stepping
2864 until we exit the run time loader code and reach the callee's
2866 if (step_over_calls
== STEP_OVER_UNDEBUGGABLE
2867 #ifdef IN_SOLIB_DYNSYM_RESOLVE_CODE
2868 && IN_SOLIB_DYNSYM_RESOLVE_CODE (stop_pc
)
2870 && in_solib_dynsym_resolve_code (stop_pc
)
2874 CORE_ADDR pc_after_resolver
=
2875 gdbarch_skip_solib_resolver (current_gdbarch
, stop_pc
);
2878 fprintf_unfiltered (gdb_stdlog
, "infrun: stepped into dynsym resolve code\n");
2880 if (pc_after_resolver
)
2882 /* Set up a step-resume breakpoint at the address
2883 indicated by SKIP_SOLIB_RESOLVER. */
2884 struct symtab_and_line sr_sal
;
2886 sr_sal
.pc
= pc_after_resolver
;
2888 insert_step_resume_breakpoint_at_sal (sr_sal
, null_frame_id
);
2895 if (step_range_end
!= 1
2896 && (step_over_calls
== STEP_OVER_UNDEBUGGABLE
2897 || step_over_calls
== STEP_OVER_ALL
)
2898 && get_frame_type (get_current_frame ()) == SIGTRAMP_FRAME
)
2901 fprintf_unfiltered (gdb_stdlog
, "infrun: stepped into signal trampoline\n");
2902 /* The inferior, while doing a "step" or "next", has ended up in
2903 a signal trampoline (either by a signal being delivered or by
2904 the signal handler returning). Just single-step until the
2905 inferior leaves the trampoline (either by calling the handler
2911 /* Check for subroutine calls. The check for the current frame
2912 equalling the step ID is not necessary - the check of the
2913 previous frame's ID is sufficient - but it is a common case and
2914 cheaper than checking the previous frame's ID.
2916 NOTE: frame_id_eq will never report two invalid frame IDs as
2917 being equal, so to get into this block, both the current and
2918 previous frame must have valid frame IDs. */
2919 if (!frame_id_eq (get_frame_id (get_current_frame ()), step_frame_id
)
2920 && frame_id_eq (frame_unwind_id (get_current_frame ()), step_frame_id
))
2922 CORE_ADDR real_stop_pc
;
2925 fprintf_unfiltered (gdb_stdlog
, "infrun: stepped into subroutine\n");
2927 if ((step_over_calls
== STEP_OVER_NONE
)
2928 || ((step_range_end
== 1)
2929 && in_prologue (prev_pc
, ecs
->stop_func_start
)))
2931 /* I presume that step_over_calls is only 0 when we're
2932 supposed to be stepping at the assembly language level
2933 ("stepi"). Just stop. */
2934 /* Also, maybe we just did a "nexti" inside a prolog, so we
2935 thought it was a subroutine call but it was not. Stop as
2938 print_stop_reason (END_STEPPING_RANGE
, 0);
2939 stop_stepping (ecs
);
2943 if (step_over_calls
== STEP_OVER_ALL
)
2945 /* We're doing a "next", set a breakpoint at callee's return
2946 address (the address at which the caller will
2948 insert_step_resume_breakpoint_at_caller (get_current_frame ());
2953 /* If we are in a function call trampoline (a stub between the
2954 calling routine and the real function), locate the real
2955 function. That's what tells us (a) whether we want to step
2956 into it at all, and (b) what prologue we want to run to the
2957 end of, if we do step into it. */
2958 real_stop_pc
= skip_language_trampoline (get_current_frame (), stop_pc
);
2959 if (real_stop_pc
== 0)
2960 real_stop_pc
= gdbarch_skip_trampoline_code
2961 (current_gdbarch
, get_current_frame (), stop_pc
);
2962 if (real_stop_pc
!= 0)
2963 ecs
->stop_func_start
= real_stop_pc
;
2966 #ifdef IN_SOLIB_DYNSYM_RESOLVE_CODE
2967 IN_SOLIB_DYNSYM_RESOLVE_CODE (ecs
->stop_func_start
)
2969 in_solib_dynsym_resolve_code (ecs
->stop_func_start
)
2973 struct symtab_and_line sr_sal
;
2975 sr_sal
.pc
= ecs
->stop_func_start
;
2977 insert_step_resume_breakpoint_at_sal (sr_sal
, null_frame_id
);
2982 /* If we have line number information for the function we are
2983 thinking of stepping into, step into it.
2985 If there are several symtabs at that PC (e.g. with include
2986 files), just want to know whether *any* of them have line
2987 numbers. find_pc_line handles this. */
2989 struct symtab_and_line tmp_sal
;
2991 tmp_sal
= find_pc_line (ecs
->stop_func_start
, 0);
2992 if (tmp_sal
.line
!= 0)
2994 step_into_function (ecs
);
2999 /* If we have no line number and the step-stop-if-no-debug is
3000 set, we stop the step so that the user has a chance to switch
3001 in assembly mode. */
3002 if (step_over_calls
== STEP_OVER_UNDEBUGGABLE
&& step_stop_if_no_debug
)
3005 print_stop_reason (END_STEPPING_RANGE
, 0);
3006 stop_stepping (ecs
);
3010 /* Set a breakpoint at callee's return address (the address at
3011 which the caller will resume). */
3012 insert_step_resume_breakpoint_at_caller (get_current_frame ());
3017 /* If we're in the return path from a shared library trampoline,
3018 we want to proceed through the trampoline when stepping. */
3019 if (gdbarch_in_solib_return_trampoline (current_gdbarch
,
3020 stop_pc
, ecs
->stop_func_name
))
3022 /* Determine where this trampoline returns. */
3023 CORE_ADDR real_stop_pc
;
3024 real_stop_pc
= gdbarch_skip_trampoline_code
3025 (current_gdbarch
, get_current_frame (), stop_pc
);
3028 fprintf_unfiltered (gdb_stdlog
, "infrun: stepped into solib return tramp\n");
3030 /* Only proceed through if we know where it's going. */
3033 /* And put the step-breakpoint there and go until there. */
3034 struct symtab_and_line sr_sal
;
3036 init_sal (&sr_sal
); /* initialize to zeroes */
3037 sr_sal
.pc
= real_stop_pc
;
3038 sr_sal
.section
= find_pc_overlay (sr_sal
.pc
);
3040 /* Do not specify what the fp should be when we stop since
3041 on some machines the prologue is where the new fp value
3043 insert_step_resume_breakpoint_at_sal (sr_sal
, null_frame_id
);
3045 /* Restart without fiddling with the step ranges or
3052 ecs
->sal
= find_pc_line (stop_pc
, 0);
3054 /* NOTE: tausq/2004-05-24: This if block used to be done before all
3055 the trampoline processing logic, however, there are some trampolines
3056 that have no names, so we should do trampoline handling first. */
3057 if (step_over_calls
== STEP_OVER_UNDEBUGGABLE
3058 && ecs
->stop_func_name
== NULL
3059 && ecs
->sal
.line
== 0)
3062 fprintf_unfiltered (gdb_stdlog
, "infrun: stepped into undebuggable function\n");
3064 /* The inferior just stepped into, or returned to, an
3065 undebuggable function (where there is no debugging information
3066 and no line number corresponding to the address where the
3067 inferior stopped). Since we want to skip this kind of code,
3068 we keep going until the inferior returns from this
3069 function - unless the user has asked us not to (via
3070 set step-mode) or we no longer know how to get back
3071 to the call site. */
3072 if (step_stop_if_no_debug
3073 || !frame_id_p (frame_unwind_id (get_current_frame ())))
3075 /* If we have no line number and the step-stop-if-no-debug
3076 is set, we stop the step so that the user has a chance to
3077 switch in assembly mode. */
3079 print_stop_reason (END_STEPPING_RANGE
, 0);
3080 stop_stepping (ecs
);
3085 /* Set a breakpoint at callee's return address (the address
3086 at which the caller will resume). */
3087 insert_step_resume_breakpoint_at_caller (get_current_frame ());
3093 if (step_range_end
== 1)
3095 /* It is stepi or nexti. We always want to stop stepping after
3098 fprintf_unfiltered (gdb_stdlog
, "infrun: stepi/nexti\n");
3100 print_stop_reason (END_STEPPING_RANGE
, 0);
3101 stop_stepping (ecs
);
3105 if (ecs
->sal
.line
== 0)
3107 /* We have no line number information. That means to stop
3108 stepping (does this always happen right after one instruction,
3109 when we do "s" in a function with no line numbers,
3110 or can this happen as a result of a return or longjmp?). */
3112 fprintf_unfiltered (gdb_stdlog
, "infrun: no line number info\n");
3114 print_stop_reason (END_STEPPING_RANGE
, 0);
3115 stop_stepping (ecs
);
3119 if ((stop_pc
== ecs
->sal
.pc
)
3120 && (ecs
->current_line
!= ecs
->sal
.line
3121 || ecs
->current_symtab
!= ecs
->sal
.symtab
))
3123 /* We are at the start of a different line. So stop. Note that
3124 we don't stop if we step into the middle of a different line.
3125 That is said to make things like for (;;) statements work
3128 fprintf_unfiltered (gdb_stdlog
, "infrun: stepped to a different line\n");
3130 print_stop_reason (END_STEPPING_RANGE
, 0);
3131 stop_stepping (ecs
);
3135 /* We aren't done stepping.
3137 Optimize by setting the stepping range to the line.
3138 (We might not be in the original line, but if we entered a
3139 new line in mid-statement, we continue stepping. This makes
3140 things like for(;;) statements work better.) */
3142 step_range_start
= ecs
->sal
.pc
;
3143 step_range_end
= ecs
->sal
.end
;
3144 step_frame_id
= get_frame_id (get_current_frame ());
3145 ecs
->current_line
= ecs
->sal
.line
;
3146 ecs
->current_symtab
= ecs
->sal
.symtab
;
3148 /* In the case where we just stepped out of a function into the
3149 middle of a line of the caller, continue stepping, but
3150 step_frame_id must be modified to current frame */
3152 /* NOTE: cagney/2003-10-16: I think this frame ID inner test is too
3153 generous. It will trigger on things like a step into a frameless
3154 stackless leaf function. I think the logic should instead look
3155 at the unwound frame ID has that should give a more robust
3156 indication of what happened. */
3157 if (step
- ID
== current
- ID
)
3158 still stepping in same function
;
3159 else if (step
- ID
== unwind (current
- ID
))
3160 stepped into a function
;
3162 stepped out of a function
;
3163 /* Of course this assumes that the frame ID unwind code is robust
3164 and we're willing to introduce frame unwind logic into this
3165 function. Fortunately, those days are nearly upon us. */
3168 struct frame_info
*frame
= get_current_frame ();
3169 struct frame_id current_frame
= get_frame_id (frame
);
3170 if (!(frame_id_inner (get_frame_arch (frame
), current_frame
,
3172 step_frame_id
= current_frame
;
3176 fprintf_unfiltered (gdb_stdlog
, "infrun: keep going\n");
3180 /* Are we in the middle of stepping? */
3183 currently_stepping (struct execution_control_state
*ecs
)
3185 return (((step_range_end
&& step_resume_breakpoint
== NULL
)
3186 || stepping_over_breakpoint
)
3187 || ecs
->stepping_through_solib_after_catch
3188 || bpstat_should_step ());
3191 /* Subroutine call with source code we should not step over. Do step
3192 to the first line of code in it. */
3195 step_into_function (struct execution_control_state
*ecs
)
3198 struct symtab_and_line sr_sal
;
3200 s
= find_pc_symtab (stop_pc
);
3201 if (s
&& s
->language
!= language_asm
)
3202 ecs
->stop_func_start
= gdbarch_skip_prologue
3203 (current_gdbarch
, ecs
->stop_func_start
);
3205 ecs
->sal
= find_pc_line (ecs
->stop_func_start
, 0);
3206 /* Use the step_resume_break to step until the end of the prologue,
3207 even if that involves jumps (as it seems to on the vax under
3209 /* If the prologue ends in the middle of a source line, continue to
3210 the end of that source line (if it is still within the function).
3211 Otherwise, just go to end of prologue. */
3213 && ecs
->sal
.pc
!= ecs
->stop_func_start
3214 && ecs
->sal
.end
< ecs
->stop_func_end
)
3215 ecs
->stop_func_start
= ecs
->sal
.end
;
3217 /* Architectures which require breakpoint adjustment might not be able
3218 to place a breakpoint at the computed address. If so, the test
3219 ``ecs->stop_func_start == stop_pc'' will never succeed. Adjust
3220 ecs->stop_func_start to an address at which a breakpoint may be
3221 legitimately placed.
3223 Note: kevinb/2004-01-19: On FR-V, if this adjustment is not
3224 made, GDB will enter an infinite loop when stepping through
3225 optimized code consisting of VLIW instructions which contain
3226 subinstructions corresponding to different source lines. On
3227 FR-V, it's not permitted to place a breakpoint on any but the
3228 first subinstruction of a VLIW instruction. When a breakpoint is
3229 set, GDB will adjust the breakpoint address to the beginning of
3230 the VLIW instruction. Thus, we need to make the corresponding
3231 adjustment here when computing the stop address. */
3233 if (gdbarch_adjust_breakpoint_address_p (current_gdbarch
))
3235 ecs
->stop_func_start
3236 = gdbarch_adjust_breakpoint_address (current_gdbarch
,
3237 ecs
->stop_func_start
);
3240 if (ecs
->stop_func_start
== stop_pc
)
3242 /* We are already there: stop now. */
3244 print_stop_reason (END_STEPPING_RANGE
, 0);
3245 stop_stepping (ecs
);
3250 /* Put the step-breakpoint there and go until there. */
3251 init_sal (&sr_sal
); /* initialize to zeroes */
3252 sr_sal
.pc
= ecs
->stop_func_start
;
3253 sr_sal
.section
= find_pc_overlay (ecs
->stop_func_start
);
3255 /* Do not specify what the fp should be when we stop since on
3256 some machines the prologue is where the new fp value is
3258 insert_step_resume_breakpoint_at_sal (sr_sal
, null_frame_id
);
3260 /* And make sure stepping stops right away then. */
3261 step_range_end
= step_range_start
;
3266 /* Insert a "step-resume breakpoint" at SR_SAL with frame ID SR_ID.
3267 This is used to both functions and to skip over code. */
3270 insert_step_resume_breakpoint_at_sal (struct symtab_and_line sr_sal
,
3271 struct frame_id sr_id
)
3273 /* There should never be more than one step-resume or longjmp-resume
3274 breakpoint per thread, so we should never be setting a new
3275 step_resume_breakpoint when one is already active. */
3276 gdb_assert (step_resume_breakpoint
== NULL
);
3279 fprintf_unfiltered (gdb_stdlog
,
3280 "infrun: inserting step-resume breakpoint at 0x%s\n",
3281 paddr_nz (sr_sal
.pc
));
3283 step_resume_breakpoint
= set_momentary_breakpoint (sr_sal
, sr_id
,
3287 /* Insert a "step-resume breakpoint" at RETURN_FRAME.pc. This is used
3288 to skip a potential signal handler.
3290 This is called with the interrupted function's frame. The signal
3291 handler, when it returns, will resume the interrupted function at
3295 insert_step_resume_breakpoint_at_frame (struct frame_info
*return_frame
)
3297 struct symtab_and_line sr_sal
;
3299 gdb_assert (return_frame
!= NULL
);
3300 init_sal (&sr_sal
); /* initialize to zeros */
3302 sr_sal
.pc
= gdbarch_addr_bits_remove
3303 (current_gdbarch
, get_frame_pc (return_frame
));
3304 sr_sal
.section
= find_pc_overlay (sr_sal
.pc
);
3306 insert_step_resume_breakpoint_at_sal (sr_sal
, get_frame_id (return_frame
));
3309 /* Similar to insert_step_resume_breakpoint_at_frame, except
3310 but a breakpoint at the previous frame's PC. This is used to
3311 skip a function after stepping into it (for "next" or if the called
3312 function has no debugging information).
3314 The current function has almost always been reached by single
3315 stepping a call or return instruction. NEXT_FRAME belongs to the
3316 current function, and the breakpoint will be set at the caller's
3319 This is a separate function rather than reusing
3320 insert_step_resume_breakpoint_at_frame in order to avoid
3321 get_prev_frame, which may stop prematurely (see the implementation
3322 of frame_unwind_id for an example). */
3325 insert_step_resume_breakpoint_at_caller (struct frame_info
*next_frame
)
3327 struct symtab_and_line sr_sal
;
3329 /* We shouldn't have gotten here if we don't know where the call site
3331 gdb_assert (frame_id_p (frame_unwind_id (next_frame
)));
3333 init_sal (&sr_sal
); /* initialize to zeros */
3335 sr_sal
.pc
= gdbarch_addr_bits_remove
3336 (current_gdbarch
, frame_pc_unwind (next_frame
));
3337 sr_sal
.section
= find_pc_overlay (sr_sal
.pc
);
3339 insert_step_resume_breakpoint_at_sal (sr_sal
, frame_unwind_id (next_frame
));
3342 /* Insert a "longjmp-resume" breakpoint at PC. This is used to set a
3343 new breakpoint at the target of a jmp_buf. The handling of
3344 longjmp-resume uses the same mechanisms used for handling
3345 "step-resume" breakpoints. */
3348 insert_longjmp_resume_breakpoint (CORE_ADDR pc
)
3350 /* There should never be more than one step-resume or longjmp-resume
3351 breakpoint per thread, so we should never be setting a new
3352 longjmp_resume_breakpoint when one is already active. */
3353 gdb_assert (step_resume_breakpoint
== NULL
);
3356 fprintf_unfiltered (gdb_stdlog
,
3357 "infrun: inserting longjmp-resume breakpoint at 0x%s\n",
3360 step_resume_breakpoint
=
3361 set_momentary_breakpoint_at_pc (pc
, bp_longjmp_resume
);
3365 stop_stepping (struct execution_control_state
*ecs
)
3368 fprintf_unfiltered (gdb_stdlog
, "infrun: stop_stepping\n");
3370 /* Let callers know we don't want to wait for the inferior anymore. */
3371 ecs
->wait_some_more
= 0;
3374 /* This function handles various cases where we need to continue
3375 waiting for the inferior. */
3376 /* (Used to be the keep_going: label in the old wait_for_inferior) */
3379 keep_going (struct execution_control_state
*ecs
)
3381 /* Save the pc before execution, to compare with pc after stop. */
3382 prev_pc
= read_pc (); /* Might have been DECR_AFTER_BREAK */
3384 /* If we did not do break;, it means we should keep running the
3385 inferior and not return to debugger. */
3387 if (stepping_over_breakpoint
&& stop_signal
!= TARGET_SIGNAL_TRAP
)
3389 /* We took a signal (which we are supposed to pass through to
3390 the inferior, else we'd have done a break above) and we
3391 haven't yet gotten our trap. Simply continue. */
3392 resume (currently_stepping (ecs
), stop_signal
);
3396 /* Either the trap was not expected, but we are continuing
3397 anyway (the user asked that this signal be passed to the
3400 The signal was SIGTRAP, e.g. it was our signal, but we
3401 decided we should resume from it.
3403 We're going to run this baby now!
3405 Note that insert_breakpoints won't try to re-insert
3406 already inserted breakpoints. Therefore, we don't
3407 care if breakpoints were already inserted, or not. */
3409 if (ecs
->stepping_over_breakpoint
)
3411 if (! use_displaced_stepping (current_gdbarch
))
3412 /* Since we can't do a displaced step, we have to remove
3413 the breakpoint while we step it. To keep things
3414 simple, we remove them all. */
3415 remove_breakpoints ();
3419 struct gdb_exception e
;
3420 /* Stop stepping when inserting breakpoints
3422 TRY_CATCH (e
, RETURN_MASK_ERROR
)
3424 insert_breakpoints ();
3428 stop_stepping (ecs
);
3433 stepping_over_breakpoint
= ecs
->stepping_over_breakpoint
;
3435 /* Do not deliver SIGNAL_TRAP (except when the user explicitly
3436 specifies that such a signal should be delivered to the
3439 Typically, this would occure when a user is debugging a
3440 target monitor on a simulator: the target monitor sets a
3441 breakpoint; the simulator encounters this break-point and
3442 halts the simulation handing control to GDB; GDB, noteing
3443 that the break-point isn't valid, returns control back to the
3444 simulator; the simulator then delivers the hardware
3445 equivalent of a SIGNAL_TRAP to the program being debugged. */
3447 if (stop_signal
== TARGET_SIGNAL_TRAP
&& !signal_program
[stop_signal
])
3448 stop_signal
= TARGET_SIGNAL_0
;
3451 resume (currently_stepping (ecs
), stop_signal
);
3454 prepare_to_wait (ecs
);
3457 /* This function normally comes after a resume, before
3458 handle_inferior_event exits. It takes care of any last bits of
3459 housekeeping, and sets the all-important wait_some_more flag. */
3462 prepare_to_wait (struct execution_control_state
*ecs
)
3465 fprintf_unfiltered (gdb_stdlog
, "infrun: prepare_to_wait\n");
3466 if (ecs
->infwait_state
== infwait_normal_state
)
3468 overlay_cache_invalid
= 1;
3470 /* We have to invalidate the registers BEFORE calling
3471 target_wait because they can be loaded from the target while
3472 in target_wait. This makes remote debugging a bit more
3473 efficient for those targets that provide critical registers
3474 as part of their normal status mechanism. */
3476 registers_changed ();
3477 ecs
->waiton_ptid
= pid_to_ptid (-1);
3478 ecs
->wp
= &(ecs
->ws
);
3480 /* This is the old end of the while loop. Let everybody know we
3481 want to wait for the inferior some more and get called again
3483 ecs
->wait_some_more
= 1;
3486 /* Print why the inferior has stopped. We always print something when
3487 the inferior exits, or receives a signal. The rest of the cases are
3488 dealt with later on in normal_stop() and print_it_typical(). Ideally
3489 there should be a call to this function from handle_inferior_event()
3490 each time stop_stepping() is called.*/
3492 print_stop_reason (enum inferior_stop_reason stop_reason
, int stop_info
)
3494 switch (stop_reason
)
3496 case END_STEPPING_RANGE
:
3497 /* We are done with a step/next/si/ni command. */
3498 /* For now print nothing. */
3499 /* Print a message only if not in the middle of doing a "step n"
3500 operation for n > 1 */
3501 if (!step_multi
|| !stop_step
)
3502 if (ui_out_is_mi_like_p (uiout
))
3505 async_reason_lookup (EXEC_ASYNC_END_STEPPING_RANGE
));
3508 /* The inferior was terminated by a signal. */
3509 annotate_signalled ();
3510 if (ui_out_is_mi_like_p (uiout
))
3513 async_reason_lookup (EXEC_ASYNC_EXITED_SIGNALLED
));
3514 ui_out_text (uiout
, "\nProgram terminated with signal ");
3515 annotate_signal_name ();
3516 ui_out_field_string (uiout
, "signal-name",
3517 target_signal_to_name (stop_info
));
3518 annotate_signal_name_end ();
3519 ui_out_text (uiout
, ", ");
3520 annotate_signal_string ();
3521 ui_out_field_string (uiout
, "signal-meaning",
3522 target_signal_to_string (stop_info
));
3523 annotate_signal_string_end ();
3524 ui_out_text (uiout
, ".\n");
3525 ui_out_text (uiout
, "The program no longer exists.\n");
3528 /* The inferior program is finished. */
3529 annotate_exited (stop_info
);
3532 if (ui_out_is_mi_like_p (uiout
))
3533 ui_out_field_string (uiout
, "reason",
3534 async_reason_lookup (EXEC_ASYNC_EXITED
));
3535 ui_out_text (uiout
, "\nProgram exited with code ");
3536 ui_out_field_fmt (uiout
, "exit-code", "0%o",
3537 (unsigned int) stop_info
);
3538 ui_out_text (uiout
, ".\n");
3542 if (ui_out_is_mi_like_p (uiout
))
3545 async_reason_lookup (EXEC_ASYNC_EXITED_NORMALLY
));
3546 ui_out_text (uiout
, "\nProgram exited normally.\n");
3548 /* Support the --return-child-result option. */
3549 return_child_result_value
= stop_info
;
3551 case SIGNAL_RECEIVED
:
3552 /* Signal received. The signal table tells us to print about
3555 ui_out_text (uiout
, "\nProgram received signal ");
3556 annotate_signal_name ();
3557 if (ui_out_is_mi_like_p (uiout
))
3559 (uiout
, "reason", async_reason_lookup (EXEC_ASYNC_SIGNAL_RECEIVED
));
3560 ui_out_field_string (uiout
, "signal-name",
3561 target_signal_to_name (stop_info
));
3562 annotate_signal_name_end ();
3563 ui_out_text (uiout
, ", ");
3564 annotate_signal_string ();
3565 ui_out_field_string (uiout
, "signal-meaning",
3566 target_signal_to_string (stop_info
));
3567 annotate_signal_string_end ();
3568 ui_out_text (uiout
, ".\n");
3571 internal_error (__FILE__
, __LINE__
,
3572 _("print_stop_reason: unrecognized enum value"));
3578 /* Here to return control to GDB when the inferior stops for real.
3579 Print appropriate messages, remove breakpoints, give terminal our modes.
3581 STOP_PRINT_FRAME nonzero means print the executing frame
3582 (pc, function, args, file, line number and line text).
3583 BREAKPOINTS_FAILED nonzero means stop was due to error
3584 attempting to insert breakpoints. */
3589 struct target_waitstatus last
;
3592 get_last_target_status (&last_ptid
, &last
);
3594 /* As with the notification of thread events, we want to delay
3595 notifying the user that we've switched thread context until
3596 the inferior actually stops.
3598 There's no point in saying anything if the inferior has exited.
3599 Note that SIGNALLED here means "exited with a signal", not
3600 "received a signal". */
3601 if (!ptid_equal (previous_inferior_ptid
, inferior_ptid
)
3602 && target_has_execution
3603 && last
.kind
!= TARGET_WAITKIND_SIGNALLED
3604 && last
.kind
!= TARGET_WAITKIND_EXITED
)
3606 target_terminal_ours_for_output ();
3607 printf_filtered (_("[Switching to %s]\n"),
3608 target_pid_to_str (inferior_ptid
));
3609 annotate_thread_changed ();
3610 previous_inferior_ptid
= inferior_ptid
;
3613 /* NOTE drow/2004-01-17: Is this still necessary? */
3614 /* Make sure that the current_frame's pc is correct. This
3615 is a correction for setting up the frame info before doing
3616 gdbarch_decr_pc_after_break */
3617 if (target_has_execution
)
3618 /* FIXME: cagney/2002-12-06: Has the PC changed? Thanks to
3619 gdbarch_decr_pc_after_break, the program counter can change. Ask the
3620 frame code to check for this and sort out any resultant mess.
3621 gdbarch_decr_pc_after_break needs to just go away. */
3622 deprecated_update_frame_pc_hack (get_current_frame (), read_pc ());
3624 if (!breakpoints_always_inserted_mode () && target_has_execution
)
3626 if (remove_breakpoints ())
3628 target_terminal_ours_for_output ();
3629 printf_filtered (_("\
3630 Cannot remove breakpoints because program is no longer writable.\n\
3631 It might be running in another process.\n\
3632 Further execution is probably impossible.\n"));
3636 /* If an auto-display called a function and that got a signal,
3637 delete that auto-display to avoid an infinite recursion. */
3639 if (stopped_by_random_signal
)
3640 disable_current_display ();
3642 /* Don't print a message if in the middle of doing a "step n"
3643 operation for n > 1 */
3644 if (step_multi
&& stop_step
)
3647 target_terminal_ours ();
3649 /* Set the current source location. This will also happen if we
3650 display the frame below, but the current SAL will be incorrect
3651 during a user hook-stop function. */
3652 if (target_has_stack
&& !stop_stack_dummy
)
3653 set_current_sal_from_frame (get_current_frame (), 1);
3655 /* Look up the hook_stop and run it (CLI internally handles problem
3656 of stop_command's pre-hook not existing). */
3658 catch_errors (hook_stop_stub
, stop_command
,
3659 "Error while running hook_stop:\n", RETURN_MASK_ALL
);
3661 if (!target_has_stack
)
3667 /* Select innermost stack frame - i.e., current frame is frame 0,
3668 and current location is based on that.
3669 Don't do this on return from a stack dummy routine,
3670 or if the program has exited. */
3672 if (!stop_stack_dummy
)
3674 select_frame (get_current_frame ());
3676 /* Print current location without a level number, if
3677 we have changed functions or hit a breakpoint.
3678 Print source line if we have one.
3679 bpstat_print() contains the logic deciding in detail
3680 what to print, based on the event(s) that just occurred. */
3682 /* If --batch-silent is enabled then there's no need to print the current
3683 source location, and to try risks causing an error message about
3684 missing source files. */
3685 if (stop_print_frame
&& !batch_silent
)
3689 int do_frame_printing
= 1;
3691 bpstat_ret
= bpstat_print (stop_bpstat
);
3695 /* If we had hit a shared library event breakpoint,
3696 bpstat_print would print out this message. If we hit
3697 an OS-level shared library event, do the same
3699 if (last
.kind
== TARGET_WAITKIND_LOADED
)
3701 printf_filtered (_("Stopped due to shared library event\n"));
3702 source_flag
= SRC_LINE
; /* something bogus */
3703 do_frame_printing
= 0;
3707 /* FIXME: cagney/2002-12-01: Given that a frame ID does
3708 (or should) carry around the function and does (or
3709 should) use that when doing a frame comparison. */
3711 && frame_id_eq (step_frame_id
,
3712 get_frame_id (get_current_frame ()))
3713 && step_start_function
== find_pc_function (stop_pc
))
3714 source_flag
= SRC_LINE
; /* finished step, just print source line */
3716 source_flag
= SRC_AND_LOC
; /* print location and source line */
3718 case PRINT_SRC_AND_LOC
:
3719 source_flag
= SRC_AND_LOC
; /* print location and source line */
3721 case PRINT_SRC_ONLY
:
3722 source_flag
= SRC_LINE
;
3725 source_flag
= SRC_LINE
; /* something bogus */
3726 do_frame_printing
= 0;
3729 internal_error (__FILE__
, __LINE__
, _("Unknown value."));
3732 if (ui_out_is_mi_like_p (uiout
))
3733 ui_out_field_int (uiout
, "thread-id",
3734 pid_to_thread_id (inferior_ptid
));
3735 /* The behavior of this routine with respect to the source
3737 SRC_LINE: Print only source line
3738 LOCATION: Print only location
3739 SRC_AND_LOC: Print location and source line */
3740 if (do_frame_printing
)
3741 print_stack_frame (get_selected_frame (NULL
), 0, source_flag
);
3743 /* Display the auto-display expressions. */
3748 /* Save the function value return registers, if we care.
3749 We might be about to restore their previous contents. */
3750 if (proceed_to_finish
)
3752 /* This should not be necessary. */
3754 regcache_xfree (stop_registers
);
3756 /* NB: The copy goes through to the target picking up the value of
3757 all the registers. */
3758 stop_registers
= regcache_dup (get_current_regcache ());
3761 if (stop_stack_dummy
)
3763 /* Pop the empty frame that contains the stack dummy. POP_FRAME
3764 ends with a setting of the current frame, so we can use that
3766 frame_pop (get_current_frame ());
3767 /* Set stop_pc to what it was before we called the function.
3768 Can't rely on restore_inferior_status because that only gets
3769 called if we don't stop in the called function. */
3770 stop_pc
= read_pc ();
3771 select_frame (get_current_frame ());
3775 annotate_stopped ();
3776 if (!suppress_stop_observer
&& !step_multi
)
3777 observer_notify_normal_stop (stop_bpstat
);
3778 /* Delete the breakpoint we stopped at, if it wants to be deleted.
3779 Delete any breakpoint that is to be deleted at the next stop. */
3780 breakpoint_auto_delete (stop_bpstat
);
3781 set_running (pid_to_ptid (-1), 0);
3785 hook_stop_stub (void *cmd
)
3787 execute_cmd_pre_hook ((struct cmd_list_element
*) cmd
);
3792 signal_stop_state (int signo
)
3794 /* Always stop on signals if we're just gaining control of the
3796 return signal_stop
[signo
] || stop_soon
!= NO_STOP_QUIETLY
;
3800 signal_print_state (int signo
)
3802 return signal_print
[signo
];
3806 signal_pass_state (int signo
)
3808 return signal_program
[signo
];
3812 signal_stop_update (int signo
, int state
)
3814 int ret
= signal_stop
[signo
];
3815 signal_stop
[signo
] = state
;
3820 signal_print_update (int signo
, int state
)
3822 int ret
= signal_print
[signo
];
3823 signal_print
[signo
] = state
;
3828 signal_pass_update (int signo
, int state
)
3830 int ret
= signal_program
[signo
];
3831 signal_program
[signo
] = state
;
3836 sig_print_header (void)
3838 printf_filtered (_("\
3839 Signal Stop\tPrint\tPass to program\tDescription\n"));
3843 sig_print_info (enum target_signal oursig
)
3845 char *name
= target_signal_to_name (oursig
);
3846 int name_padding
= 13 - strlen (name
);
3848 if (name_padding
<= 0)
3851 printf_filtered ("%s", name
);
3852 printf_filtered ("%*.*s ", name_padding
, name_padding
, " ");
3853 printf_filtered ("%s\t", signal_stop
[oursig
] ? "Yes" : "No");
3854 printf_filtered ("%s\t", signal_print
[oursig
] ? "Yes" : "No");
3855 printf_filtered ("%s\t\t", signal_program
[oursig
] ? "Yes" : "No");
3856 printf_filtered ("%s\n", target_signal_to_string (oursig
));
3859 /* Specify how various signals in the inferior should be handled. */
3862 handle_command (char *args
, int from_tty
)
3865 int digits
, wordlen
;
3866 int sigfirst
, signum
, siglast
;
3867 enum target_signal oursig
;
3870 unsigned char *sigs
;
3871 struct cleanup
*old_chain
;
3875 error_no_arg (_("signal to handle"));
3878 /* Allocate and zero an array of flags for which signals to handle. */
3880 nsigs
= (int) TARGET_SIGNAL_LAST
;
3881 sigs
= (unsigned char *) alloca (nsigs
);
3882 memset (sigs
, 0, nsigs
);
3884 /* Break the command line up into args. */
3886 argv
= buildargv (args
);
3891 old_chain
= make_cleanup_freeargv (argv
);
3893 /* Walk through the args, looking for signal oursigs, signal names, and
3894 actions. Signal numbers and signal names may be interspersed with
3895 actions, with the actions being performed for all signals cumulatively
3896 specified. Signal ranges can be specified as <LOW>-<HIGH>. */
3898 while (*argv
!= NULL
)
3900 wordlen
= strlen (*argv
);
3901 for (digits
= 0; isdigit ((*argv
)[digits
]); digits
++)
3905 sigfirst
= siglast
= -1;
3907 if (wordlen
>= 1 && !strncmp (*argv
, "all", wordlen
))
3909 /* Apply action to all signals except those used by the
3910 debugger. Silently skip those. */
3913 siglast
= nsigs
- 1;
3915 else if (wordlen
>= 1 && !strncmp (*argv
, "stop", wordlen
))
3917 SET_SIGS (nsigs
, sigs
, signal_stop
);
3918 SET_SIGS (nsigs
, sigs
, signal_print
);
3920 else if (wordlen
>= 1 && !strncmp (*argv
, "ignore", wordlen
))
3922 UNSET_SIGS (nsigs
, sigs
, signal_program
);
3924 else if (wordlen
>= 2 && !strncmp (*argv
, "print", wordlen
))
3926 SET_SIGS (nsigs
, sigs
, signal_print
);
3928 else if (wordlen
>= 2 && !strncmp (*argv
, "pass", wordlen
))
3930 SET_SIGS (nsigs
, sigs
, signal_program
);
3932 else if (wordlen
>= 3 && !strncmp (*argv
, "nostop", wordlen
))
3934 UNSET_SIGS (nsigs
, sigs
, signal_stop
);
3936 else if (wordlen
>= 3 && !strncmp (*argv
, "noignore", wordlen
))
3938 SET_SIGS (nsigs
, sigs
, signal_program
);
3940 else if (wordlen
>= 4 && !strncmp (*argv
, "noprint", wordlen
))
3942 UNSET_SIGS (nsigs
, sigs
, signal_print
);
3943 UNSET_SIGS (nsigs
, sigs
, signal_stop
);
3945 else if (wordlen
>= 4 && !strncmp (*argv
, "nopass", wordlen
))
3947 UNSET_SIGS (nsigs
, sigs
, signal_program
);
3949 else if (digits
> 0)
3951 /* It is numeric. The numeric signal refers to our own
3952 internal signal numbering from target.h, not to host/target
3953 signal number. This is a feature; users really should be
3954 using symbolic names anyway, and the common ones like
3955 SIGHUP, SIGINT, SIGALRM, etc. will work right anyway. */
3957 sigfirst
= siglast
= (int)
3958 target_signal_from_command (atoi (*argv
));
3959 if ((*argv
)[digits
] == '-')
3962 target_signal_from_command (atoi ((*argv
) + digits
+ 1));
3964 if (sigfirst
> siglast
)
3966 /* Bet he didn't figure we'd think of this case... */
3974 oursig
= target_signal_from_name (*argv
);
3975 if (oursig
!= TARGET_SIGNAL_UNKNOWN
)
3977 sigfirst
= siglast
= (int) oursig
;
3981 /* Not a number and not a recognized flag word => complain. */
3982 error (_("Unrecognized or ambiguous flag word: \"%s\"."), *argv
);
3986 /* If any signal numbers or symbol names were found, set flags for
3987 which signals to apply actions to. */
3989 for (signum
= sigfirst
; signum
>= 0 && signum
<= siglast
; signum
++)
3991 switch ((enum target_signal
) signum
)
3993 case TARGET_SIGNAL_TRAP
:
3994 case TARGET_SIGNAL_INT
:
3995 if (!allsigs
&& !sigs
[signum
])
3997 if (query ("%s is used by the debugger.\n\
3998 Are you sure you want to change it? ", target_signal_to_name ((enum target_signal
) signum
)))
4004 printf_unfiltered (_("Not confirmed, unchanged.\n"));
4005 gdb_flush (gdb_stdout
);
4009 case TARGET_SIGNAL_0
:
4010 case TARGET_SIGNAL_DEFAULT
:
4011 case TARGET_SIGNAL_UNKNOWN
:
4012 /* Make sure that "all" doesn't print these. */
4023 target_notice_signals (inferior_ptid
);
4027 /* Show the results. */
4028 sig_print_header ();
4029 for (signum
= 0; signum
< nsigs
; signum
++)
4033 sig_print_info (signum
);
4038 do_cleanups (old_chain
);
4042 xdb_handle_command (char *args
, int from_tty
)
4045 struct cleanup
*old_chain
;
4047 /* Break the command line up into args. */
4049 argv
= buildargv (args
);
4054 old_chain
= make_cleanup_freeargv (argv
);
4055 if (argv
[1] != (char *) NULL
)
4060 bufLen
= strlen (argv
[0]) + 20;
4061 argBuf
= (char *) xmalloc (bufLen
);
4065 enum target_signal oursig
;
4067 oursig
= target_signal_from_name (argv
[0]);
4068 memset (argBuf
, 0, bufLen
);
4069 if (strcmp (argv
[1], "Q") == 0)
4070 sprintf (argBuf
, "%s %s", argv
[0], "noprint");
4073 if (strcmp (argv
[1], "s") == 0)
4075 if (!signal_stop
[oursig
])
4076 sprintf (argBuf
, "%s %s", argv
[0], "stop");
4078 sprintf (argBuf
, "%s %s", argv
[0], "nostop");
4080 else if (strcmp (argv
[1], "i") == 0)
4082 if (!signal_program
[oursig
])
4083 sprintf (argBuf
, "%s %s", argv
[0], "pass");
4085 sprintf (argBuf
, "%s %s", argv
[0], "nopass");
4087 else if (strcmp (argv
[1], "r") == 0)
4089 if (!signal_print
[oursig
])
4090 sprintf (argBuf
, "%s %s", argv
[0], "print");
4092 sprintf (argBuf
, "%s %s", argv
[0], "noprint");
4098 handle_command (argBuf
, from_tty
);
4100 printf_filtered (_("Invalid signal handling flag.\n"));
4105 do_cleanups (old_chain
);
4108 /* Print current contents of the tables set by the handle command.
4109 It is possible we should just be printing signals actually used
4110 by the current target (but for things to work right when switching
4111 targets, all signals should be in the signal tables). */
4114 signals_info (char *signum_exp
, int from_tty
)
4116 enum target_signal oursig
;
4117 sig_print_header ();
4121 /* First see if this is a symbol name. */
4122 oursig
= target_signal_from_name (signum_exp
);
4123 if (oursig
== TARGET_SIGNAL_UNKNOWN
)
4125 /* No, try numeric. */
4127 target_signal_from_command (parse_and_eval_long (signum_exp
));
4129 sig_print_info (oursig
);
4133 printf_filtered ("\n");
4134 /* These ugly casts brought to you by the native VAX compiler. */
4135 for (oursig
= TARGET_SIGNAL_FIRST
;
4136 (int) oursig
< (int) TARGET_SIGNAL_LAST
;
4137 oursig
= (enum target_signal
) ((int) oursig
+ 1))
4141 if (oursig
!= TARGET_SIGNAL_UNKNOWN
4142 && oursig
!= TARGET_SIGNAL_DEFAULT
&& oursig
!= TARGET_SIGNAL_0
)
4143 sig_print_info (oursig
);
4146 printf_filtered (_("\nUse the \"handle\" command to change these tables.\n"));
4149 struct inferior_status
4151 enum target_signal stop_signal
;
4155 int stop_stack_dummy
;
4156 int stopped_by_random_signal
;
4157 int stepping_over_breakpoint
;
4158 CORE_ADDR step_range_start
;
4159 CORE_ADDR step_range_end
;
4160 struct frame_id step_frame_id
;
4161 enum step_over_calls_kind step_over_calls
;
4162 CORE_ADDR step_resume_break_address
;
4163 int stop_after_trap
;
4166 /* These are here because if call_function_by_hand has written some
4167 registers and then decides to call error(), we better not have changed
4169 struct regcache
*registers
;
4171 /* A frame unique identifier. */
4172 struct frame_id selected_frame_id
;
4174 int breakpoint_proceeded
;
4175 int restore_stack_info
;
4176 int proceed_to_finish
;
4180 write_inferior_status_register (struct inferior_status
*inf_status
, int regno
,
4183 int size
= register_size (current_gdbarch
, regno
);
4184 void *buf
= alloca (size
);
4185 store_signed_integer (buf
, size
, val
);
4186 regcache_raw_write (inf_status
->registers
, regno
, buf
);
4189 /* Save all of the information associated with the inferior<==>gdb
4190 connection. INF_STATUS is a pointer to a "struct inferior_status"
4191 (defined in inferior.h). */
4193 struct inferior_status
*
4194 save_inferior_status (int restore_stack_info
)
4196 struct inferior_status
*inf_status
= XMALLOC (struct inferior_status
);
4198 inf_status
->stop_signal
= stop_signal
;
4199 inf_status
->stop_pc
= stop_pc
;
4200 inf_status
->stop_step
= stop_step
;
4201 inf_status
->stop_stack_dummy
= stop_stack_dummy
;
4202 inf_status
->stopped_by_random_signal
= stopped_by_random_signal
;
4203 inf_status
->stepping_over_breakpoint
= stepping_over_breakpoint
;
4204 inf_status
->step_range_start
= step_range_start
;
4205 inf_status
->step_range_end
= step_range_end
;
4206 inf_status
->step_frame_id
= step_frame_id
;
4207 inf_status
->step_over_calls
= step_over_calls
;
4208 inf_status
->stop_after_trap
= stop_after_trap
;
4209 inf_status
->stop_soon
= stop_soon
;
4210 /* Save original bpstat chain here; replace it with copy of chain.
4211 If caller's caller is walking the chain, they'll be happier if we
4212 hand them back the original chain when restore_inferior_status is
4214 inf_status
->stop_bpstat
= stop_bpstat
;
4215 stop_bpstat
= bpstat_copy (stop_bpstat
);
4216 inf_status
->breakpoint_proceeded
= breakpoint_proceeded
;
4217 inf_status
->restore_stack_info
= restore_stack_info
;
4218 inf_status
->proceed_to_finish
= proceed_to_finish
;
4220 inf_status
->registers
= regcache_dup (get_current_regcache ());
4222 inf_status
->selected_frame_id
= get_frame_id (get_selected_frame (NULL
));
4227 restore_selected_frame (void *args
)
4229 struct frame_id
*fid
= (struct frame_id
*) args
;
4230 struct frame_info
*frame
;
4232 frame
= frame_find_by_id (*fid
);
4234 /* If inf_status->selected_frame_id is NULL, there was no previously
4238 warning (_("Unable to restore previously selected frame."));
4242 select_frame (frame
);
4248 restore_inferior_status (struct inferior_status
*inf_status
)
4250 stop_signal
= inf_status
->stop_signal
;
4251 stop_pc
= inf_status
->stop_pc
;
4252 stop_step
= inf_status
->stop_step
;
4253 stop_stack_dummy
= inf_status
->stop_stack_dummy
;
4254 stopped_by_random_signal
= inf_status
->stopped_by_random_signal
;
4255 stepping_over_breakpoint
= inf_status
->stepping_over_breakpoint
;
4256 step_range_start
= inf_status
->step_range_start
;
4257 step_range_end
= inf_status
->step_range_end
;
4258 step_frame_id
= inf_status
->step_frame_id
;
4259 step_over_calls
= inf_status
->step_over_calls
;
4260 stop_after_trap
= inf_status
->stop_after_trap
;
4261 stop_soon
= inf_status
->stop_soon
;
4262 bpstat_clear (&stop_bpstat
);
4263 stop_bpstat
= inf_status
->stop_bpstat
;
4264 breakpoint_proceeded
= inf_status
->breakpoint_proceeded
;
4265 proceed_to_finish
= inf_status
->proceed_to_finish
;
4267 /* The inferior can be gone if the user types "print exit(0)"
4268 (and perhaps other times). */
4269 if (target_has_execution
)
4270 /* NB: The register write goes through to the target. */
4271 regcache_cpy (get_current_regcache (), inf_status
->registers
);
4272 regcache_xfree (inf_status
->registers
);
4274 /* FIXME: If we are being called after stopping in a function which
4275 is called from gdb, we should not be trying to restore the
4276 selected frame; it just prints a spurious error message (The
4277 message is useful, however, in detecting bugs in gdb (like if gdb
4278 clobbers the stack)). In fact, should we be restoring the
4279 inferior status at all in that case? . */
4281 if (target_has_stack
&& inf_status
->restore_stack_info
)
4283 /* The point of catch_errors is that if the stack is clobbered,
4284 walking the stack might encounter a garbage pointer and
4285 error() trying to dereference it. */
4287 (restore_selected_frame
, &inf_status
->selected_frame_id
,
4288 "Unable to restore previously selected frame:\n",
4289 RETURN_MASK_ERROR
) == 0)
4290 /* Error in restoring the selected frame. Select the innermost
4292 select_frame (get_current_frame ());
4300 do_restore_inferior_status_cleanup (void *sts
)
4302 restore_inferior_status (sts
);
4306 make_cleanup_restore_inferior_status (struct inferior_status
*inf_status
)
4308 return make_cleanup (do_restore_inferior_status_cleanup
, inf_status
);
4312 discard_inferior_status (struct inferior_status
*inf_status
)
4314 /* See save_inferior_status for info on stop_bpstat. */
4315 bpstat_clear (&inf_status
->stop_bpstat
);
4316 regcache_xfree (inf_status
->registers
);
4321 inferior_has_forked (int pid
, int *child_pid
)
4323 struct target_waitstatus last
;
4326 get_last_target_status (&last_ptid
, &last
);
4328 if (last
.kind
!= TARGET_WAITKIND_FORKED
)
4331 if (ptid_get_pid (last_ptid
) != pid
)
4334 *child_pid
= last
.value
.related_pid
;
4339 inferior_has_vforked (int pid
, int *child_pid
)
4341 struct target_waitstatus last
;
4344 get_last_target_status (&last_ptid
, &last
);
4346 if (last
.kind
!= TARGET_WAITKIND_VFORKED
)
4349 if (ptid_get_pid (last_ptid
) != pid
)
4352 *child_pid
= last
.value
.related_pid
;
4357 inferior_has_execd (int pid
, char **execd_pathname
)
4359 struct target_waitstatus last
;
4362 get_last_target_status (&last_ptid
, &last
);
4364 if (last
.kind
!= TARGET_WAITKIND_EXECD
)
4367 if (ptid_get_pid (last_ptid
) != pid
)
4370 *execd_pathname
= xstrdup (last
.value
.execd_pathname
);
4374 /* Oft used ptids */
4376 ptid_t minus_one_ptid
;
4378 /* Create a ptid given the necessary PID, LWP, and TID components. */
4381 ptid_build (int pid
, long lwp
, long tid
)
4391 /* Create a ptid from just a pid. */
4394 pid_to_ptid (int pid
)
4396 return ptid_build (pid
, 0, 0);
4399 /* Fetch the pid (process id) component from a ptid. */
4402 ptid_get_pid (ptid_t ptid
)
4407 /* Fetch the lwp (lightweight process) component from a ptid. */
4410 ptid_get_lwp (ptid_t ptid
)
4415 /* Fetch the tid (thread id) component from a ptid. */
4418 ptid_get_tid (ptid_t ptid
)
4423 /* ptid_equal() is used to test equality of two ptids. */
4426 ptid_equal (ptid_t ptid1
, ptid_t ptid2
)
4428 return (ptid1
.pid
== ptid2
.pid
&& ptid1
.lwp
== ptid2
.lwp
4429 && ptid1
.tid
== ptid2
.tid
);
4432 /* restore_inferior_ptid() will be used by the cleanup machinery
4433 to restore the inferior_ptid value saved in a call to
4434 save_inferior_ptid(). */
4437 restore_inferior_ptid (void *arg
)
4439 ptid_t
*saved_ptid_ptr
= arg
;
4440 inferior_ptid
= *saved_ptid_ptr
;
4444 /* Save the value of inferior_ptid so that it may be restored by a
4445 later call to do_cleanups(). Returns the struct cleanup pointer
4446 needed for later doing the cleanup. */
4449 save_inferior_ptid (void)
4451 ptid_t
*saved_ptid_ptr
;
4453 saved_ptid_ptr
= xmalloc (sizeof (ptid_t
));
4454 *saved_ptid_ptr
= inferior_ptid
;
4455 return make_cleanup (restore_inferior_ptid
, saved_ptid_ptr
);
4460 _initialize_infrun (void)
4464 struct cmd_list_element
*c
;
4466 add_info ("signals", signals_info
, _("\
4467 What debugger does when program gets various signals.\n\
4468 Specify a signal as argument to print info on that signal only."));
4469 add_info_alias ("handle", "signals", 0);
4471 add_com ("handle", class_run
, handle_command
, _("\
4472 Specify how to handle a signal.\n\
4473 Args are signals and actions to apply to those signals.\n\
4474 Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\
4475 from 1-15 are allowed for compatibility with old versions of GDB.\n\
4476 Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\
4477 The special arg \"all\" is recognized to mean all signals except those\n\
4478 used by the debugger, typically SIGTRAP and SIGINT.\n\
4479 Recognized actions include \"stop\", \"nostop\", \"print\", \"noprint\",\n\
4480 \"pass\", \"nopass\", \"ignore\", or \"noignore\".\n\
4481 Stop means reenter debugger if this signal happens (implies print).\n\
4482 Print means print a message if this signal happens.\n\
4483 Pass means let program see this signal; otherwise program doesn't know.\n\
4484 Ignore is a synonym for nopass and noignore is a synonym for pass.\n\
4485 Pass and Stop may be combined."));
4488 add_com ("lz", class_info
, signals_info
, _("\
4489 What debugger does when program gets various signals.\n\
4490 Specify a signal as argument to print info on that signal only."));
4491 add_com ("z", class_run
, xdb_handle_command
, _("\
4492 Specify how to handle a signal.\n\
4493 Args are signals and actions to apply to those signals.\n\
4494 Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\
4495 from 1-15 are allowed for compatibility with old versions of GDB.\n\
4496 Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\
4497 The special arg \"all\" is recognized to mean all signals except those\n\
4498 used by the debugger, typically SIGTRAP and SIGINT.\n\
4499 Recognized actions include \"s\" (toggles between stop and nostop), \n\
4500 \"r\" (toggles between print and noprint), \"i\" (toggles between pass and \
4501 nopass), \"Q\" (noprint)\n\
4502 Stop means reenter debugger if this signal happens (implies print).\n\
4503 Print means print a message if this signal happens.\n\
4504 Pass means let program see this signal; otherwise program doesn't know.\n\
4505 Ignore is a synonym for nopass and noignore is a synonym for pass.\n\
4506 Pass and Stop may be combined."));
4510 stop_command
= add_cmd ("stop", class_obscure
,
4511 not_just_help_class_command
, _("\
4512 There is no `stop' command, but you can set a hook on `stop'.\n\
4513 This allows you to set a list of commands to be run each time execution\n\
4514 of the program stops."), &cmdlist
);
4516 add_setshow_zinteger_cmd ("infrun", class_maintenance
, &debug_infrun
, _("\
4517 Set inferior debugging."), _("\
4518 Show inferior debugging."), _("\
4519 When non-zero, inferior specific debugging is enabled."),
4522 &setdebuglist
, &showdebuglist
);
4524 add_setshow_boolean_cmd ("displaced", class_maintenance
, &debug_displaced
, _("\
4525 Set displaced stepping debugging."), _("\
4526 Show displaced stepping debugging."), _("\
4527 When non-zero, displaced stepping specific debugging is enabled."),
4529 show_debug_displaced
,
4530 &setdebuglist
, &showdebuglist
);
4532 numsigs
= (int) TARGET_SIGNAL_LAST
;
4533 signal_stop
= (unsigned char *) xmalloc (sizeof (signal_stop
[0]) * numsigs
);
4534 signal_print
= (unsigned char *)
4535 xmalloc (sizeof (signal_print
[0]) * numsigs
);
4536 signal_program
= (unsigned char *)
4537 xmalloc (sizeof (signal_program
[0]) * numsigs
);
4538 for (i
= 0; i
< numsigs
; i
++)
4541 signal_print
[i
] = 1;
4542 signal_program
[i
] = 1;
4545 /* Signals caused by debugger's own actions
4546 should not be given to the program afterwards. */
4547 signal_program
[TARGET_SIGNAL_TRAP
] = 0;
4548 signal_program
[TARGET_SIGNAL_INT
] = 0;
4550 /* Signals that are not errors should not normally enter the debugger. */
4551 signal_stop
[TARGET_SIGNAL_ALRM
] = 0;
4552 signal_print
[TARGET_SIGNAL_ALRM
] = 0;
4553 signal_stop
[TARGET_SIGNAL_VTALRM
] = 0;
4554 signal_print
[TARGET_SIGNAL_VTALRM
] = 0;
4555 signal_stop
[TARGET_SIGNAL_PROF
] = 0;
4556 signal_print
[TARGET_SIGNAL_PROF
] = 0;
4557 signal_stop
[TARGET_SIGNAL_CHLD
] = 0;
4558 signal_print
[TARGET_SIGNAL_CHLD
] = 0;
4559 signal_stop
[TARGET_SIGNAL_IO
] = 0;
4560 signal_print
[TARGET_SIGNAL_IO
] = 0;
4561 signal_stop
[TARGET_SIGNAL_POLL
] = 0;
4562 signal_print
[TARGET_SIGNAL_POLL
] = 0;
4563 signal_stop
[TARGET_SIGNAL_URG
] = 0;
4564 signal_print
[TARGET_SIGNAL_URG
] = 0;
4565 signal_stop
[TARGET_SIGNAL_WINCH
] = 0;
4566 signal_print
[TARGET_SIGNAL_WINCH
] = 0;
4568 /* These signals are used internally by user-level thread
4569 implementations. (See signal(5) on Solaris.) Like the above
4570 signals, a healthy program receives and handles them as part of
4571 its normal operation. */
4572 signal_stop
[TARGET_SIGNAL_LWP
] = 0;
4573 signal_print
[TARGET_SIGNAL_LWP
] = 0;
4574 signal_stop
[TARGET_SIGNAL_WAITING
] = 0;
4575 signal_print
[TARGET_SIGNAL_WAITING
] = 0;
4576 signal_stop
[TARGET_SIGNAL_CANCEL
] = 0;
4577 signal_print
[TARGET_SIGNAL_CANCEL
] = 0;
4579 add_setshow_zinteger_cmd ("stop-on-solib-events", class_support
,
4580 &stop_on_solib_events
, _("\
4581 Set stopping for shared library events."), _("\
4582 Show stopping for shared library events."), _("\
4583 If nonzero, gdb will give control to the user when the dynamic linker\n\
4584 notifies gdb of shared library events. The most common event of interest\n\
4585 to the user would be loading/unloading of a new library."),
4587 show_stop_on_solib_events
,
4588 &setlist
, &showlist
);
4590 add_setshow_enum_cmd ("follow-fork-mode", class_run
,
4591 follow_fork_mode_kind_names
,
4592 &follow_fork_mode_string
, _("\
4593 Set debugger response to a program call of fork or vfork."), _("\
4594 Show debugger response to a program call of fork or vfork."), _("\
4595 A fork or vfork creates a new process. follow-fork-mode can be:\n\
4596 parent - the original process is debugged after a fork\n\
4597 child - the new process is debugged after a fork\n\
4598 The unfollowed process will continue to run.\n\
4599 By default, the debugger will follow the parent process."),
4601 show_follow_fork_mode_string
,
4602 &setlist
, &showlist
);
4604 add_setshow_enum_cmd ("scheduler-locking", class_run
,
4605 scheduler_enums
, &scheduler_mode
, _("\
4606 Set mode for locking scheduler during execution."), _("\
4607 Show mode for locking scheduler during execution."), _("\
4608 off == no locking (threads may preempt at any time)\n\
4609 on == full locking (no thread except the current thread may run)\n\
4610 step == scheduler locked during every single-step operation.\n\
4611 In this mode, no other thread may run during a step command.\n\
4612 Other threads may run while stepping over a function call ('next')."),
4613 set_schedlock_func
, /* traps on target vector */
4614 show_scheduler_mode
,
4615 &setlist
, &showlist
);
4617 add_setshow_boolean_cmd ("step-mode", class_run
, &step_stop_if_no_debug
, _("\
4618 Set mode of the step operation."), _("\
4619 Show mode of the step operation."), _("\
4620 When set, doing a step over a function without debug line information\n\
4621 will stop at the first instruction of that function. Otherwise, the\n\
4622 function is skipped and the step command stops at a different source line."),
4624 show_step_stop_if_no_debug
,
4625 &setlist
, &showlist
);
4627 add_setshow_boolean_cmd ("can-use-displaced-stepping", class_maintenance
,
4628 &can_use_displaced_stepping
, _("\
4629 Set debugger's willingness to use displaced stepping."), _("\
4630 Show debugger's willingness to use displaced stepping."), _("\
4631 If zero, gdb will not use displaced stepping to step over\n\
4632 breakpoints, even if such is supported by the target."),
4634 show_can_use_displaced_stepping
,
4635 &maintenance_set_cmdlist
,
4636 &maintenance_show_cmdlist
);
4638 /* ptid initializations */
4639 null_ptid
= ptid_build (0, 0, 0);
4640 minus_one_ptid
= ptid_build (-1, 0, 0);
4641 inferior_ptid
= null_ptid
;
4642 target_last_wait_ptid
= minus_one_ptid
;
4643 displaced_step_ptid
= null_ptid
;