1 /* Target-struct-independent code to start (run) and stop an inferior process.
2 Copyright 1986-1989, 1991-1999 Free Software Foundation, Inc.
4 This file is part of GDB.
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 59 Temple Place - Suite 330,
19 Boston, MA 02111-1307, USA. */
22 #include "gdb_string.h"
27 #include "breakpoint.h"
32 #include "gdbthread.h"
34 #include "symfile.h" /* for overlay functions */
37 #include "event-loop.h"
39 /* Prototypes for local functions */
41 static void signals_info
PARAMS ((char *, int));
43 static void handle_command
PARAMS ((char *, int));
45 static void sig_print_info
PARAMS ((enum target_signal
));
47 static void sig_print_header
PARAMS ((void));
49 static void resume_cleanups
PARAMS ((int));
51 static int hook_stop_stub
PARAMS ((PTR
));
53 static void delete_breakpoint_current_contents
PARAMS ((PTR
));
55 static void set_follow_fork_mode_command
PARAMS ((char *arg
, int from_tty
, struct cmd_list_element
* c
));
57 static void complete_execution
PARAMS ((void));
59 int inferior_ignoring_startup_exec_events
= 0;
60 int inferior_ignoring_leading_exec_events
= 0;
62 /* In asynchronous mode, but simulating synchronous execution. */
63 int sync_execution
= 0;
65 /* wait_for_inferior and normal_stop use this to notify the user
66 when the inferior stopped in a different thread than it had been
68 static int switched_from_inferior_pid
;
70 /* This will be true for configurations that may actually report an
71 inferior pid different from the original. At present this is only
72 true for HP-UX native. */
74 #ifndef MAY_SWITCH_FROM_INFERIOR_PID
75 #define MAY_SWITCH_FROM_INFERIOR_PID (0)
78 static int may_switch_from_inferior_pid
= MAY_SWITCH_FROM_INFERIOR_PID
;
80 /* This is true for configurations that may follow through execl() and
81 similar functions. At present this is only true for HP-UX native. */
83 #ifndef MAY_FOLLOW_EXEC
84 #define MAY_FOLLOW_EXEC (0)
87 static int may_follow_exec
= MAY_FOLLOW_EXEC
;
89 /* resume and wait_for_inferior use this to ensure that when
90 stepping over a hit breakpoint in a threaded application
91 only the thread that hit the breakpoint is stepped and the
92 other threads don't continue. This prevents having another
93 thread run past the breakpoint while it is temporarily
96 This is not thread-specific, so it isn't saved as part of
99 Versions of gdb which don't use the "step == this thread steps
100 and others continue" model but instead use the "step == this
101 thread steps and others wait" shouldn't do this. */
102 static int thread_step_needed
= 0;
104 /* This is true if thread_step_needed should actually be used. At
105 present this is only true for HP-UX native. */
107 #ifndef USE_THREAD_STEP_NEEDED
108 #define USE_THREAD_STEP_NEEDED (0)
111 static int use_thread_step_needed
= USE_THREAD_STEP_NEEDED
;
113 static void follow_inferior_fork
PARAMS ((int parent_pid
,
118 static void follow_fork
PARAMS ((int parent_pid
, int child_pid
));
120 static void follow_vfork
PARAMS ((int parent_pid
, int child_pid
));
122 static void set_schedlock_func
PARAMS ((char *args
, int from_tty
,
123 struct cmd_list_element
* c
));
125 static int is_internal_shlib_eventpoint
PARAMS ((struct breakpoint
* ep
));
127 static int stopped_for_internal_shlib_event
PARAMS ((bpstat bs
));
129 static int stopped_for_shlib_catchpoint
PARAMS ((bpstat bs
,
130 struct breakpoint
** cp_p
));
133 struct execution_control_state
;
135 static int currently_stepping
PARAMS ((struct execution_control_state
* ecs
));
137 static void xdb_handle_command
PARAMS ((char *args
, int from_tty
));
139 void _initialize_infrun
PARAMS ((void));
141 /* GET_LONGJMP_TARGET returns the PC at which longjmp() will resume the
142 program. It needs to examine the jmp_buf argument and extract the PC
143 from it. The return value is non-zero on success, zero otherwise. */
145 #ifndef GET_LONGJMP_TARGET
146 #define GET_LONGJMP_TARGET(PC_ADDR) 0
150 /* Some machines have trampoline code that sits between function callers
151 and the actual functions themselves. If this machine doesn't have
152 such things, disable their processing. */
154 #ifndef SKIP_TRAMPOLINE_CODE
155 #define SKIP_TRAMPOLINE_CODE(pc) 0
158 /* Dynamic function trampolines are similar to solib trampolines in that they
159 are between the caller and the callee. The difference is that when you
160 enter a dynamic trampoline, you can't determine the callee's address. Some
161 (usually complex) code needs to run in the dynamic trampoline to figure out
162 the callee's address. This macro is usually called twice. First, when we
163 enter the trampoline (looks like a normal function call at that point). It
164 should return the PC of a point within the trampoline where the callee's
165 address is known. Second, when we hit the breakpoint, this routine returns
166 the callee's address. At that point, things proceed as per a step resume
169 #ifndef DYNAMIC_TRAMPOLINE_NEXTPC
170 #define DYNAMIC_TRAMPOLINE_NEXTPC(pc) 0
173 /* On SVR4 based systems, determining the callee's address is exceedingly
174 difficult and depends on the implementation of the run time loader.
175 If we are stepping at the source level, we single step until we exit
176 the run time loader code and reach the callee's address. */
178 #ifndef IN_SOLIB_DYNSYM_RESOLVE_CODE
179 #define IN_SOLIB_DYNSYM_RESOLVE_CODE(pc) 0
182 /* For SVR4 shared libraries, each call goes through a small piece of
183 trampoline code in the ".plt" section. IN_SOLIB_CALL_TRAMPOLINE evaluates
184 to nonzero if we are current stopped in one of these. */
186 #ifndef IN_SOLIB_CALL_TRAMPOLINE
187 #define IN_SOLIB_CALL_TRAMPOLINE(pc,name) 0
190 /* In some shared library schemes, the return path from a shared library
191 call may need to go through a trampoline too. */
193 #ifndef IN_SOLIB_RETURN_TRAMPOLINE
194 #define IN_SOLIB_RETURN_TRAMPOLINE(pc,name) 0
197 /* This function returns TRUE if pc is the address of an instruction
198 that lies within the dynamic linker (such as the event hook, or the
201 This function must be used only when a dynamic linker event has
202 been caught, and the inferior is being stepped out of the hook, or
203 undefined results are guaranteed. */
205 #ifndef SOLIB_IN_DYNAMIC_LINKER
206 #define SOLIB_IN_DYNAMIC_LINKER(pid,pc) 0
209 /* On MIPS16, a function that returns a floating point value may call
210 a library helper function to copy the return value to a floating point
211 register. The IGNORE_HELPER_CALL macro returns non-zero if we
212 should ignore (i.e. step over) this function call. */
213 #ifndef IGNORE_HELPER_CALL
214 #define IGNORE_HELPER_CALL(pc) 0
217 /* On some systems, the PC may be left pointing at an instruction that won't
218 actually be executed. This is usually indicated by a bit in the PSW. If
219 we find ourselves in such a state, then we step the target beyond the
220 nullified instruction before returning control to the user so as to avoid
223 #ifndef INSTRUCTION_NULLIFIED
224 #define INSTRUCTION_NULLIFIED 0
227 /* Convert the #defines into values. This is temporary until wfi control
228 flow is completely sorted out. */
230 #ifndef HAVE_STEPPABLE_WATCHPOINT
231 #define HAVE_STEPPABLE_WATCHPOINT 0
233 #undef HAVE_STEPPABLE_WATCHPOINT
234 #define HAVE_STEPPABLE_WATCHPOINT 1
237 #ifndef HAVE_NONSTEPPABLE_WATCHPOINT
238 #define HAVE_NONSTEPPABLE_WATCHPOINT 0
240 #undef HAVE_NONSTEPPABLE_WATCHPOINT
241 #define HAVE_NONSTEPPABLE_WATCHPOINT 1
244 #ifndef HAVE_CONTINUABLE_WATCHPOINT
245 #define HAVE_CONTINUABLE_WATCHPOINT 0
247 #undef HAVE_CONTINUABLE_WATCHPOINT
248 #define HAVE_CONTINUABLE_WATCHPOINT 1
251 /* Tables of how to react to signals; the user sets them. */
253 static unsigned char *signal_stop
;
254 static unsigned char *signal_print
;
255 static unsigned char *signal_program
;
257 #define SET_SIGS(nsigs,sigs,flags) \
259 int signum = (nsigs); \
260 while (signum-- > 0) \
261 if ((sigs)[signum]) \
262 (flags)[signum] = 1; \
265 #define UNSET_SIGS(nsigs,sigs,flags) \
267 int signum = (nsigs); \
268 while (signum-- > 0) \
269 if ((sigs)[signum]) \
270 (flags)[signum] = 0; \
274 /* Command list pointer for the "stop" placeholder. */
276 static struct cmd_list_element
*stop_command
;
278 /* Nonzero if breakpoints are now inserted in the inferior. */
280 static int breakpoints_inserted
;
282 /* Function inferior was in as of last step command. */
284 static struct symbol
*step_start_function
;
286 /* Nonzero if we are expecting a trace trap and should proceed from it. */
288 static int trap_expected
;
291 /* Nonzero if we want to give control to the user when we're notified
292 of shared library events by the dynamic linker. */
293 static int stop_on_solib_events
;
297 /* Nonzero if the next time we try to continue the inferior, it will
298 step one instruction and generate a spurious trace trap.
299 This is used to compensate for a bug in HP-UX. */
301 static int trap_expected_after_continue
;
304 /* Nonzero means expecting a trace trap
305 and should stop the inferior and return silently when it happens. */
309 /* Nonzero means expecting a trap and caller will handle it themselves.
310 It is used after attach, due to attaching to a process;
311 when running in the shell before the child program has been exec'd;
312 and when running some kinds of remote stuff (FIXME?). */
314 int stop_soon_quietly
;
316 /* Nonzero if proceed is being used for a "finish" command or a similar
317 situation when stop_registers should be saved. */
319 int proceed_to_finish
;
321 /* Save register contents here when about to pop a stack dummy frame,
322 if-and-only-if proceed_to_finish is set.
323 Thus this contains the return value from the called function (assuming
324 values are returned in a register). */
326 char *stop_registers
;
328 /* Nonzero if program stopped due to error trying to insert breakpoints. */
330 static int breakpoints_failed
;
332 /* Nonzero after stop if current stack frame should be printed. */
334 static int stop_print_frame
;
336 static struct breakpoint
*step_resume_breakpoint
= NULL
;
337 static struct breakpoint
*through_sigtramp_breakpoint
= NULL
;
339 /* On some platforms (e.g., HP-UX), hardware watchpoints have bad
340 interactions with an inferior that is running a kernel function
341 (aka, a system call or "syscall"). wait_for_inferior therefore
342 may have a need to know when the inferior is in a syscall. This
343 is a count of the number of inferior threads which are known to
344 currently be running in a syscall. */
345 static int number_of_threads_in_syscalls
;
347 /* This is used to remember when a fork, vfork or exec event
348 was caught by a catchpoint, and thus the event is to be
349 followed at the next resume of the inferior, and not
353 enum target_waitkind kind
;
363 char *execd_pathname
;
367 /* Some platforms don't allow us to do anything meaningful with a
368 vforked child until it has exec'd. Vforked processes on such
369 platforms can only be followed after they've exec'd.
371 When this is set to 0, a vfork can be immediately followed,
372 and an exec can be followed merely as an exec. When this is
373 set to 1, a vfork event has been seen, but cannot be followed
374 until the exec is seen.
376 (In the latter case, inferior_pid is still the parent of the
377 vfork, and pending_follow.fork_event.child_pid is the child. The
378 appropriate process is followed, according to the setting of
379 follow-fork-mode.) */
380 static int follow_vfork_when_exec
;
382 static char *follow_fork_mode_kind_names
[] =
384 /* ??rehrauer: The "both" option is broken, by what may be a 10.20
385 kernel problem. It's also not terribly useful without a GUI to
386 help the user drive two debuggers. So for now, I'm disabling
388 "parent", "child", "both", "ask" };
390 "parent", "child", "ask"};
392 static char *follow_fork_mode_string
= NULL
;
396 follow_inferior_fork (parent_pid
, child_pid
, has_forked
, has_vforked
)
402 int followed_parent
= 0;
403 int followed_child
= 0;
406 /* Which process did the user want us to follow? */
408 savestring (follow_fork_mode_string
, strlen (follow_fork_mode_string
));
410 /* Or, did the user not know, and want us to ask? */
411 if (STREQ (follow_fork_mode_string
, "ask"))
413 char requested_mode
[100];
416 error ("\"ask\" mode NYI");
417 follow_mode
= savestring (requested_mode
, strlen (requested_mode
));
420 /* If we're to be following the parent, then detach from child_pid.
421 We're already following the parent, so need do nothing explicit
423 if (STREQ (follow_mode
, "parent"))
427 /* We're already attached to the parent, by default. */
429 /* Before detaching from the child, remove all breakpoints from
430 it. (This won't actually modify the breakpoint list, but will
431 physically remove the breakpoints from the child.) */
432 if (!has_vforked
|| !follow_vfork_when_exec
)
434 detach_breakpoints (child_pid
);
435 #ifdef SOLIB_REMOVE_INFERIOR_HOOK
436 SOLIB_REMOVE_INFERIOR_HOOK (child_pid
);
440 /* Detach from the child. */
443 target_require_detach (child_pid
, "", 1);
446 /* If we're to be following the child, then attach to it, detach
447 from inferior_pid, and set inferior_pid to child_pid. */
448 else if (STREQ (follow_mode
, "child"))
450 char child_pid_spelling
[100]; /* Arbitrary length. */
454 /* Before detaching from the parent, detach all breakpoints from
455 the child. But only if we're forking, or if we follow vforks
456 as soon as they happen. (If we're following vforks only when
457 the child has exec'd, then it's very wrong to try to write
458 back the "shadow contents" of inserted breakpoints now -- they
459 belong to the child's pre-exec'd a.out.) */
460 if (!has_vforked
|| !follow_vfork_when_exec
)
462 detach_breakpoints (child_pid
);
465 /* Before detaching from the parent, remove all breakpoints from it. */
466 remove_breakpoints ();
468 /* Also reset the solib inferior hook from the parent. */
469 #ifdef SOLIB_REMOVE_INFERIOR_HOOK
470 SOLIB_REMOVE_INFERIOR_HOOK (inferior_pid
);
473 /* Detach from the parent. */
475 target_detach (NULL
, 1);
477 /* Attach to the child. */
478 inferior_pid
= child_pid
;
479 sprintf (child_pid_spelling
, "%d", child_pid
);
482 target_require_attach (child_pid_spelling
, 1);
484 /* Was there a step_resume breakpoint? (There was if the user
485 did a "next" at the fork() call.) If so, explicitly reset its
488 step_resumes are a form of bp that are made to be per-thread.
489 Since we created the step_resume bp when the parent process
490 was being debugged, and now are switching to the child process,
491 from the breakpoint package's viewpoint, that's a switch of
492 "threads". We must update the bp's notion of which thread
493 it is for, or it'll be ignored when it triggers... */
494 if (step_resume_breakpoint
&&
495 (!has_vforked
|| !follow_vfork_when_exec
))
496 breakpoint_re_set_thread (step_resume_breakpoint
);
498 /* Reinsert all breakpoints in the child. (The user may've set
499 breakpoints after catching the fork, in which case those
500 actually didn't get set in the child, but only in the parent.) */
501 if (!has_vforked
|| !follow_vfork_when_exec
)
503 breakpoint_re_set ();
504 insert_breakpoints ();
508 /* If we're to be following both parent and child, then fork ourselves,
509 and attach the debugger clone to the child. */
510 else if (STREQ (follow_mode
, "both"))
512 char pid_suffix
[100]; /* Arbitrary length. */
514 /* Clone ourselves to follow the child. This is the end of our
515 involvement with child_pid; our clone will take it from here... */
517 target_clone_and_follow_inferior (child_pid
, &followed_child
);
518 followed_parent
= !followed_child
;
520 /* We continue to follow the parent. To help distinguish the two
521 debuggers, though, both we and our clone will reset our prompts. */
522 sprintf (pid_suffix
, "[%d] ", inferior_pid
);
523 set_prompt (strcat (get_prompt (), pid_suffix
));
526 /* The parent and child of a vfork share the same address space.
527 Also, on some targets the order in which vfork and exec events
528 are received for parent in child requires some delicate handling
531 For instance, on ptrace-based HPUX we receive the child's vfork
532 event first, at which time the parent has been suspended by the
533 OS and is essentially untouchable until the child's exit or second
534 exec event arrives. At that time, the parent's vfork event is
535 delivered to us, and that's when we see and decide how to follow
536 the vfork. But to get to that point, we must continue the child
537 until it execs or exits. To do that smoothly, all breakpoints
538 must be removed from the child, in case there are any set between
539 the vfork() and exec() calls. But removing them from the child
540 also removes them from the parent, due to the shared-address-space
541 nature of a vfork'd parent and child. On HPUX, therefore, we must
542 take care to restore the bp's to the parent before we continue it.
543 Else, it's likely that we may not stop in the expected place. (The
544 worst scenario is when the user tries to step over a vfork() call;
545 the step-resume bp must be restored for the step to properly stop
546 in the parent after the call completes!)
548 Sequence of events, as reported to gdb from HPUX:
550 Parent Child Action for gdb to take
551 -------------------------------------------------------
552 1 VFORK Continue child
558 target_post_follow_vfork (parent_pid
,
564 pending_follow
.fork_event
.saw_parent_fork
= 0;
565 pending_follow
.fork_event
.saw_child_fork
= 0;
571 follow_fork (parent_pid
, child_pid
)
575 follow_inferior_fork (parent_pid
, child_pid
, 1, 0);
579 /* Forward declaration. */
580 static void follow_exec
PARAMS ((int, char *));
583 follow_vfork (parent_pid
, child_pid
)
587 follow_inferior_fork (parent_pid
, child_pid
, 0, 1);
589 /* Did we follow the child? Had it exec'd before we saw the parent vfork? */
590 if (pending_follow
.fork_event
.saw_child_exec
&& (inferior_pid
== child_pid
))
592 pending_follow
.fork_event
.saw_child_exec
= 0;
593 pending_follow
.kind
= TARGET_WAITKIND_SPURIOUS
;
594 follow_exec (inferior_pid
, pending_follow
.execd_pathname
);
595 free (pending_follow
.execd_pathname
);
600 follow_exec (pid
, execd_pathname
)
602 char *execd_pathname
;
605 struct target_ops
*tgt
;
607 if (!may_follow_exec
)
610 /* Did this exec() follow a vfork()? If so, we must follow the
611 vfork now too. Do it before following the exec. */
612 if (follow_vfork_when_exec
&&
613 (pending_follow
.kind
== TARGET_WAITKIND_VFORKED
))
615 pending_follow
.kind
= TARGET_WAITKIND_SPURIOUS
;
616 follow_vfork (inferior_pid
, pending_follow
.fork_event
.child_pid
);
617 follow_vfork_when_exec
= 0;
618 saved_pid
= inferior_pid
;
620 /* Did we follow the parent? If so, we're done. If we followed
621 the child then we must also follow its exec(). */
622 if (inferior_pid
== pending_follow
.fork_event
.parent_pid
)
626 /* This is an exec event that we actually wish to pay attention to.
627 Refresh our symbol table to the newly exec'd program, remove any
630 If there are breakpoints, they aren't really inserted now,
631 since the exec() transformed our inferior into a fresh set
634 We want to preserve symbolic breakpoints on the list, since
635 we have hopes that they can be reset after the new a.out's
636 symbol table is read.
638 However, any "raw" breakpoints must be removed from the list
639 (e.g., the solib bp's), since their address is probably invalid
642 And, we DON'T want to call delete_breakpoints() here, since
643 that may write the bp's "shadow contents" (the instruction
644 value that was overwritten witha TRAP instruction). Since
645 we now have a new a.out, those shadow contents aren't valid. */
646 update_breakpoints_after_exec ();
648 /* If there was one, it's gone now. We cannot truly step-to-next
649 statement through an exec(). */
650 step_resume_breakpoint
= NULL
;
651 step_range_start
= 0;
654 /* If there was one, it's gone now. */
655 through_sigtramp_breakpoint
= NULL
;
657 /* What is this a.out's name? */
658 printf_unfiltered ("Executing new program: %s\n", execd_pathname
);
660 /* We've followed the inferior through an exec. Therefore, the
661 inferior has essentially been killed & reborn. */
663 /* First collect the run target in effect. */
664 tgt
= find_run_target ();
665 /* If we can't find one, things are in a very strange state... */
667 error ("Could find run target to save before following exec");
669 gdb_flush (gdb_stdout
);
670 target_mourn_inferior ();
671 inferior_pid
= saved_pid
; /* Because mourn_inferior resets inferior_pid. */
674 /* That a.out is now the one to use. */
675 exec_file_attach (execd_pathname
, 0);
677 /* And also is where symbols can be found. */
678 symbol_file_command (execd_pathname
, 0);
680 /* Reset the shared library package. This ensures that we get
681 a shlib event when the child reaches "_start", at which point
682 the dld will have had a chance to initialize the child. */
683 #if defined(SOLIB_RESTART)
686 #ifdef SOLIB_CREATE_INFERIOR_HOOK
687 SOLIB_CREATE_INFERIOR_HOOK (inferior_pid
);
690 /* Reinsert all breakpoints. (Those which were symbolic have
691 been reset to the proper address in the new a.out, thanks
692 to symbol_file_command...) */
693 insert_breakpoints ();
695 /* The next resume of this inferior should bring it to the shlib
696 startup breakpoints. (If the user had also set bp's on
697 "main" from the old (parent) process, then they'll auto-
698 matically get reset there in the new process.) */
701 /* Non-zero if we just simulating a single-step. This is needed
702 because we cannot remove the breakpoints in the inferior process
703 until after the `wait' in `wait_for_inferior'. */
704 static int singlestep_breakpoints_inserted_p
= 0;
707 /* Things to clean up if we QUIT out of resume (). */
710 resume_cleanups (arg
)
716 static char schedlock_off
[] = "off";
717 static char schedlock_on
[] = "on";
718 static char schedlock_step
[] = "step";
719 static char *scheduler_mode
= schedlock_off
;
720 static char *scheduler_enums
[] =
721 {schedlock_off
, schedlock_on
, schedlock_step
};
724 set_schedlock_func (args
, from_tty
, c
)
727 struct cmd_list_element
*c
;
729 if (c
->type
== set_cmd
)
730 if (!target_can_lock_scheduler
)
732 scheduler_mode
= schedlock_off
;
733 error ("Target '%s' cannot support this command.",
739 /* Resume the inferior, but allow a QUIT. This is useful if the user
740 wants to interrupt some lengthy single-stepping operation
741 (for child processes, the SIGINT goes to the inferior, and so
742 we get a SIGINT random_signal, but for remote debugging and perhaps
743 other targets, that's not true).
745 STEP nonzero if we should step (zero to continue instead).
746 SIG is the signal to give the inferior (zero for none). */
750 enum target_signal sig
;
752 int should_resume
= 1;
753 struct cleanup
*old_cleanups
= make_cleanup ((make_cleanup_func
)
757 #ifdef CANNOT_STEP_BREAKPOINT
758 /* Most targets can step a breakpoint instruction, thus executing it
759 normally. But if this one cannot, just continue and we will hit
761 if (step
&& breakpoints_inserted
&& breakpoint_here_p (read_pc ()))
765 if (SOFTWARE_SINGLE_STEP_P
&& step
)
767 /* Do it the hard way, w/temp breakpoints */
768 SOFTWARE_SINGLE_STEP (sig
, 1 /*insert-breakpoints */ );
769 /* ...and don't ask hardware to do it. */
771 /* and do not pull these breakpoints until after a `wait' in
772 `wait_for_inferior' */
773 singlestep_breakpoints_inserted_p
= 1;
776 /* Handle any optimized stores to the inferior NOW... */
777 #ifdef DO_DEFERRED_STORES
781 /* If there were any forks/vforks/execs that were caught and are
782 now to be followed, then do so. */
783 switch (pending_follow
.kind
)
785 case (TARGET_WAITKIND_FORKED
):
786 pending_follow
.kind
= TARGET_WAITKIND_SPURIOUS
;
787 follow_fork (inferior_pid
, pending_follow
.fork_event
.child_pid
);
790 case (TARGET_WAITKIND_VFORKED
):
792 int saw_child_exec
= pending_follow
.fork_event
.saw_child_exec
;
794 pending_follow
.kind
= TARGET_WAITKIND_SPURIOUS
;
795 follow_vfork (inferior_pid
, pending_follow
.fork_event
.child_pid
);
797 /* Did we follow the child, but not yet see the child's exec event?
798 If so, then it actually ought to be waiting for us; we respond to
799 parent vfork events. We don't actually want to resume the child
800 in this situation; we want to just get its exec event. */
801 if (!saw_child_exec
&&
802 (inferior_pid
== pending_follow
.fork_event
.child_pid
))
807 case (TARGET_WAITKIND_EXECD
):
808 /* If we saw a vfork event but couldn't follow it until we saw
809 an exec, then now might be the time! */
810 pending_follow
.kind
= TARGET_WAITKIND_SPURIOUS
;
811 /* follow_exec is called as soon as the exec event is seen. */
818 /* Install inferior's terminal modes. */
819 target_terminal_inferior ();
823 if (use_thread_step_needed
&& thread_step_needed
)
825 /* We stopped on a BPT instruction;
826 don't continue other threads and
827 just step this thread. */
828 thread_step_needed
= 0;
830 if (!breakpoint_here_p (read_pc ()))
832 /* Breakpoint deleted: ok to do regular resume
833 where all the threads either step or continue. */
834 target_resume (-1, step
, sig
);
840 warning ("Internal error, changing continue to step.");
841 remove_breakpoints ();
842 breakpoints_inserted
= 0;
847 target_resume (inferior_pid
, step
, sig
);
852 /* Vanilla resume. */
854 if ((scheduler_mode
== schedlock_on
) ||
855 (scheduler_mode
== schedlock_step
&& step
!= 0))
856 target_resume (inferior_pid
, step
, sig
);
858 target_resume (-1, step
, sig
);
862 discard_cleanups (old_cleanups
);
866 /* Clear out all variables saying what to do when inferior is continued.
867 First do this, then set the ones you want, then call `proceed'. */
870 clear_proceed_status ()
873 step_range_start
= 0;
875 step_frame_address
= 0;
876 step_over_calls
= -1;
878 stop_soon_quietly
= 0;
879 proceed_to_finish
= 0;
880 breakpoint_proceeded
= 1; /* We're about to proceed... */
882 /* Discard any remaining commands or status from previous stop. */
883 bpstat_clear (&stop_bpstat
);
886 /* Basic routine for continuing the program in various fashions.
888 ADDR is the address to resume at, or -1 for resume where stopped.
889 SIGGNAL is the signal to give it, or 0 for none,
890 or -1 for act according to how it stopped.
891 STEP is nonzero if should trap after one instruction.
892 -1 means return after that and print nothing.
893 You should probably set various step_... variables
894 before calling here, if you are stepping.
896 You should call clear_proceed_status before calling proceed. */
899 proceed (addr
, siggnal
, step
)
901 enum target_signal siggnal
;
907 step_start_function
= find_pc_function (read_pc ());
911 if (addr
== (CORE_ADDR
) - 1)
913 /* If there is a breakpoint at the address we will resume at,
914 step one instruction before inserting breakpoints
915 so that we do not stop right away (and report a second
916 hit at this breakpoint). */
918 if (read_pc () == stop_pc
&& breakpoint_here_p (read_pc ()))
921 #ifndef STEP_SKIPS_DELAY
922 #define STEP_SKIPS_DELAY(pc) (0)
923 #define STEP_SKIPS_DELAY_P (0)
925 /* Check breakpoint_here_p first, because breakpoint_here_p is fast
926 (it just checks internal GDB data structures) and STEP_SKIPS_DELAY
927 is slow (it needs to read memory from the target). */
928 if (STEP_SKIPS_DELAY_P
929 && breakpoint_here_p (read_pc () + 4)
930 && STEP_SKIPS_DELAY (read_pc ()))
937 /* New address; we don't need to single-step a thread
938 over a breakpoint we just hit, 'cause we aren't
939 continuing from there.
941 It's not worth worrying about the case where a user
942 asks for a "jump" at the current PC--if they get the
943 hiccup of re-hiting a hit breakpoint, what else do
945 thread_step_needed
= 0;
948 #ifdef PREPARE_TO_PROCEED
949 /* In a multi-threaded task we may select another thread
950 and then continue or step.
952 But if the old thread was stopped at a breakpoint, it
953 will immediately cause another breakpoint stop without
954 any execution (i.e. it will report a breakpoint hit
955 incorrectly). So we must step over it first.
957 PREPARE_TO_PROCEED checks the current thread against the thread
958 that reported the most recent event. If a step-over is required
959 it returns TRUE and sets the current thread to the old thread. */
960 if (PREPARE_TO_PROCEED (1) && breakpoint_here_p (read_pc ()))
963 thread_step_needed
= 1;
966 #endif /* PREPARE_TO_PROCEED */
969 if (trap_expected_after_continue
)
971 /* If (step == 0), a trap will be automatically generated after
972 the first instruction is executed. Force step one
973 instruction to clear this condition. This should not occur
974 if step is nonzero, but it is harmless in that case. */
976 trap_expected_after_continue
= 0;
978 #endif /* HP_OS_BUG */
981 /* We will get a trace trap after one instruction.
982 Continue it automatically and insert breakpoints then. */
986 int temp
= insert_breakpoints ();
989 print_sys_errmsg ("ptrace", temp
);
990 error ("Cannot insert breakpoints.\n\
991 The same program may be running in another process.");
994 breakpoints_inserted
= 1;
997 if (siggnal
!= TARGET_SIGNAL_DEFAULT
)
998 stop_signal
= siggnal
;
999 /* If this signal should not be seen by program,
1000 give it zero. Used for debugging signals. */
1001 else if (!signal_program
[stop_signal
])
1002 stop_signal
= TARGET_SIGNAL_0
;
1004 annotate_starting ();
1006 /* Make sure that output from GDB appears before output from the
1008 gdb_flush (gdb_stdout
);
1010 /* Resume inferior. */
1011 resume (oneproc
|| step
|| bpstat_should_step (), stop_signal
);
1013 /* Wait for it to stop (if not standalone)
1014 and in any case decode why it stopped, and act accordingly. */
1015 /* Do this only if we are not using the event loop, or if the target
1016 does not support asynchronous execution. */
1017 if (!async_p
|| !target_has_async
)
1019 wait_for_inferior ();
1024 /* Record the pc and sp of the program the last time it stopped.
1025 These are just used internally by wait_for_inferior, but need
1026 to be preserved over calls to it and cleared when the inferior
1028 static CORE_ADDR prev_pc
;
1029 static CORE_ADDR prev_func_start
;
1030 static char *prev_func_name
;
1033 /* Start remote-debugging of a machine over a serial link. */
1037 init_thread_list ();
1038 init_wait_for_inferior ();
1039 stop_soon_quietly
= 1;
1042 /* Go on waiting only in case gdb is not started in async mode, or
1043 in case the target doesn't support async execution. */
1044 if (!async_p
|| !target_has_async
)
1046 wait_for_inferior ();
1051 /* The 'tar rem' command should always look synchronous,
1052 i.e. display the prompt only once it has connected and
1053 started the target. */
1055 push_prompt ("", "", "");
1056 delete_file_handler (input_fd
);
1057 target_executing
= 1;
1061 /* Initialize static vars when a new inferior begins. */
1064 init_wait_for_inferior ()
1066 /* These are meaningless until the first time through wait_for_inferior. */
1068 prev_func_start
= 0;
1069 prev_func_name
= NULL
;
1072 trap_expected_after_continue
= 0;
1074 breakpoints_inserted
= 0;
1075 breakpoint_init_inferior (inf_starting
);
1077 /* Don't confuse first call to proceed(). */
1078 stop_signal
= TARGET_SIGNAL_0
;
1080 /* The first resume is not following a fork/vfork/exec. */
1081 pending_follow
.kind
= TARGET_WAITKIND_SPURIOUS
; /* I.e., none. */
1082 pending_follow
.fork_event
.saw_parent_fork
= 0;
1083 pending_follow
.fork_event
.saw_child_fork
= 0;
1084 pending_follow
.fork_event
.saw_child_exec
= 0;
1086 /* See wait_for_inferior's handling of SYSCALL_ENTRY/RETURN events. */
1087 number_of_threads_in_syscalls
= 0;
1089 clear_proceed_status ();
1093 delete_breakpoint_current_contents (arg
)
1096 struct breakpoint
**breakpointp
= (struct breakpoint
**) arg
;
1097 if (*breakpointp
!= NULL
)
1099 delete_breakpoint (*breakpointp
);
1100 *breakpointp
= NULL
;
1104 /* This enum encodes possible reasons for doing a target_wait, so that
1105 wfi can call target_wait in one place. (Ultimately the call will be
1106 moved out of the infinite loop entirely.) */
1110 infwait_normal_state
,
1111 infwait_thread_hop_state
,
1112 infwait_nullified_state
,
1113 infwait_nonstep_watch_state
1116 /* This structure contains what used to be local variables in
1117 wait_for_inferior. Probably many of them can return to being
1118 locals in handle_inferior_event. */
1120 struct execution_control_state
1122 struct target_waitstatus ws
;
1123 struct target_waitstatus
*wp
;
1126 CORE_ADDR stop_func_start
;
1127 CORE_ADDR stop_func_end
;
1128 char *stop_func_name
;
1129 struct symtab_and_line sal
;
1130 int remove_breakpoints_on_following_step
;
1132 struct symtab
*current_symtab
;
1133 int handling_longjmp
; /* FIXME */
1135 int saved_inferior_pid
;
1137 int stepping_through_solib_after_catch
;
1138 bpstat stepping_through_solib_catchpoints
;
1139 int enable_hw_watchpoints_after_wait
;
1140 int stepping_through_sigtramp
;
1141 int new_thread_event
;
1142 struct target_waitstatus tmpstatus
;
1143 enum infwait_states infwait_state
;
1148 void init_execution_control_state
PARAMS ((struct execution_control_state
* ecs
));
1150 void handle_inferior_event
PARAMS ((struct execution_control_state
* ecs
));
1152 /* Wait for control to return from inferior to debugger.
1153 If inferior gets a signal, we may decide to start it up again
1154 instead of returning. That is why there is a loop in this function.
1155 When this function actually returns it means the inferior
1156 should be left stopped and GDB should read more commands. */
1159 wait_for_inferior ()
1161 struct cleanup
*old_cleanups
;
1162 struct execution_control_state ecss
;
1163 struct execution_control_state
*ecs
;
1165 old_cleanups
= make_cleanup (delete_breakpoint_current_contents
,
1166 &step_resume_breakpoint
);
1167 make_cleanup (delete_breakpoint_current_contents
,
1168 &through_sigtramp_breakpoint
);
1170 /* wfi still stays in a loop, so it's OK just to take the address of
1171 a local to get the ecs pointer. */
1174 /* Fill in with reasonable starting values. */
1175 init_execution_control_state (ecs
);
1177 thread_step_needed
= 0;
1179 /* We'll update this if & when we switch to a new thread. */
1180 if (may_switch_from_inferior_pid
)
1181 switched_from_inferior_pid
= inferior_pid
;
1183 overlay_cache_invalid
= 1;
1185 /* We have to invalidate the registers BEFORE calling target_wait
1186 because they can be loaded from the target while in target_wait.
1187 This makes remote debugging a bit more efficient for those
1188 targets that provide critical registers as part of their normal
1189 status mechanism. */
1191 registers_changed ();
1195 if (target_wait_hook
)
1196 ecs
->pid
= target_wait_hook (ecs
->waiton_pid
, ecs
->wp
);
1198 ecs
->pid
= target_wait (ecs
->waiton_pid
, ecs
->wp
);
1200 /* Now figure out what to do with the result of the result. */
1201 handle_inferior_event (ecs
);
1203 if (!ecs
->wait_some_more
)
1206 do_cleanups (old_cleanups
);
1209 /* Asynchronous version of wait_for_inferior. It is called by the
1210 event loop whenever a change of state is detected on the file
1211 descriptor corresponding to the target. It can be called more than
1212 once to complete a single execution command. In such cases we need
1213 to keep the state in a global variable ASYNC_ECSS. If it is the
1214 last time that this function is called for a single execution
1215 command, then report to the user that the inferior has stopped, and
1216 do the necessary cleanups. */
1218 struct execution_control_state async_ecss
;
1219 struct execution_control_state
*async_ecs
;
1222 fetch_inferior_event ()
1224 static struct cleanup
*old_cleanups
;
1226 async_ecs
= &async_ecss
;
1228 if (!async_ecs
->wait_some_more
)
1230 old_cleanups
= make_exec_cleanup (delete_breakpoint_current_contents
,
1231 &step_resume_breakpoint
);
1232 make_exec_cleanup (delete_breakpoint_current_contents
,
1233 &through_sigtramp_breakpoint
);
1235 /* Fill in with reasonable starting values. */
1236 init_execution_control_state (async_ecs
);
1238 thread_step_needed
= 0;
1240 /* We'll update this if & when we switch to a new thread. */
1241 if (may_switch_from_inferior_pid
)
1242 switched_from_inferior_pid
= inferior_pid
;
1244 overlay_cache_invalid
= 1;
1246 /* We have to invalidate the registers BEFORE calling target_wait
1247 because they can be loaded from the target while in target_wait.
1248 This makes remote debugging a bit more efficient for those
1249 targets that provide critical registers as part of their normal
1250 status mechanism. */
1252 registers_changed ();
1255 if (target_wait_hook
)
1256 async_ecs
->pid
= target_wait_hook (async_ecs
->waiton_pid
, async_ecs
->wp
);
1258 async_ecs
->pid
= target_wait (async_ecs
->waiton_pid
, async_ecs
->wp
);
1260 /* Now figure out what to do with the result of the result. */
1261 handle_inferior_event (async_ecs
);
1263 if (!async_ecs
->wait_some_more
)
1265 /* Do only the cleanups that have been added by this
1266 function. Let the continuations for the commands do the rest,
1267 if there are any. */
1268 do_exec_cleanups (old_cleanups
);
1270 /* Is there anything left to do for the command issued to
1272 do_all_continuations ();
1273 /* Reset things after target has stopped for the async commands. */
1274 complete_execution ();
1278 /* Prepare an execution control state for looping through a
1279 wait_for_inferior-type loop. */
1282 init_execution_control_state (ecs
)
1283 struct execution_control_state
*ecs
;
1285 ecs
->random_signal
= 0;
1286 ecs
->remove_breakpoints_on_following_step
= 0;
1287 ecs
->handling_longjmp
= 0; /* FIXME */
1288 ecs
->update_step_sp
= 0;
1289 ecs
->stepping_through_solib_after_catch
= 0;
1290 ecs
->stepping_through_solib_catchpoints
= NULL
;
1291 ecs
->enable_hw_watchpoints_after_wait
= 0;
1292 ecs
->stepping_through_sigtramp
= 0;
1293 ecs
->sal
= find_pc_line (prev_pc
, 0);
1294 ecs
->current_line
= ecs
->sal
.line
;
1295 ecs
->current_symtab
= ecs
->sal
.symtab
;
1296 ecs
->infwait_state
= infwait_normal_state
;
1297 ecs
->waiton_pid
= -1;
1298 ecs
->wp
= &(ecs
->ws
);
1301 /* Call this function before setting step_resume_breakpoint, as a
1302 sanity check. We should never be setting a new
1303 step_resume_breakpoint when we have an old one active. */
1305 check_for_old_step_resume_breakpoint ()
1307 if (step_resume_breakpoint
)
1308 warning ("GDB bug: infrun.c (wait_for_inferior): dropping old step_resume breakpoint");
1311 /* Given an execution control state that has been freshly filled in
1312 by an event from the inferior, figure out what it means and take
1313 appropriate action. */
1316 handle_inferior_event (ecs
)
1317 struct execution_control_state
*ecs
;
1320 int stepped_after_stopped_by_watchpoint
;
1322 /* Keep this extra brace for now, minimizes diffs. */
1324 switch (ecs
->infwait_state
)
1326 case infwait_normal_state
:
1327 /* Since we've done a wait, we have a new event. Don't
1328 carry over any expectations about needing to step over a
1330 thread_step_needed
= 0;
1332 /* See comments where a TARGET_WAITKIND_SYSCALL_RETURN event
1333 is serviced in this loop, below. */
1334 if (ecs
->enable_hw_watchpoints_after_wait
)
1336 TARGET_ENABLE_HW_WATCHPOINTS (inferior_pid
);
1337 ecs
->enable_hw_watchpoints_after_wait
= 0;
1339 stepped_after_stopped_by_watchpoint
= 0;
1342 case infwait_thread_hop_state
:
1343 insert_breakpoints ();
1345 /* We need to restart all the threads now,
1346 * unles we're running in scheduler-locked mode.
1347 * FIXME: shouldn't we look at currently_stepping ()?
1349 if (scheduler_mode
== schedlock_on
)
1350 target_resume (ecs
->pid
, 0, TARGET_SIGNAL_0
);
1352 target_resume (-1, 0, TARGET_SIGNAL_0
);
1353 ecs
->infwait_state
= infwait_normal_state
;
1356 case infwait_nullified_state
:
1359 case infwait_nonstep_watch_state
:
1360 insert_breakpoints ();
1362 /* FIXME-maybe: is this cleaner than setting a flag? Does it
1363 handle things like signals arriving and other things happening
1364 in combination correctly? */
1365 stepped_after_stopped_by_watchpoint
= 1;
1368 ecs
->infwait_state
= infwait_normal_state
;
1370 flush_cached_frames ();
1372 /* If it's a new process, add it to the thread database */
1374 ecs
->new_thread_event
= ((ecs
->pid
!= inferior_pid
) && !in_thread_list (ecs
->pid
));
1376 if (ecs
->ws
.kind
!= TARGET_WAITKIND_EXITED
1377 && ecs
->ws
.kind
!= TARGET_WAITKIND_SIGNALLED
1378 && ecs
->new_thread_event
)
1380 add_thread (ecs
->pid
);
1382 printf_filtered ("[New %s]\n", target_pid_or_tid_to_str (ecs
->pid
));
1385 /* NOTE: This block is ONLY meant to be invoked in case of a
1386 "thread creation event"! If it is invoked for any other
1387 sort of event (such as a new thread landing on a breakpoint),
1388 the event will be discarded, which is almost certainly
1391 To avoid this, the low-level module (eg. target_wait)
1392 should call in_thread_list and add_thread, so that the
1393 new thread is known by the time we get here. */
1395 /* We may want to consider not doing a resume here in order
1396 to give the user a chance to play with the new thread.
1397 It might be good to make that a user-settable option. */
1399 /* At this point, all threads are stopped (happens
1400 automatically in either the OS or the native code).
1401 Therefore we need to continue all threads in order to
1404 target_resume (-1, 0, TARGET_SIGNAL_0
);
1409 switch (ecs
->ws
.kind
)
1411 case TARGET_WAITKIND_LOADED
:
1412 /* Ignore gracefully during startup of the inferior, as it
1413 might be the shell which has just loaded some objects,
1414 otherwise add the symbols for the newly loaded objects. */
1416 if (!stop_soon_quietly
)
1418 /* Remove breakpoints, SOLIB_ADD might adjust
1419 breakpoint addresses via breakpoint_re_set. */
1420 if (breakpoints_inserted
)
1421 remove_breakpoints ();
1423 /* Check for any newly added shared libraries if we're
1424 supposed to be adding them automatically. */
1427 /* Switch terminal for any messages produced by
1428 breakpoint_re_set. */
1429 target_terminal_ours_for_output ();
1430 SOLIB_ADD (NULL
, 0, NULL
);
1431 target_terminal_inferior ();
1434 /* Reinsert breakpoints and continue. */
1435 if (breakpoints_inserted
)
1436 insert_breakpoints ();
1439 resume (0, TARGET_SIGNAL_0
);
1442 case TARGET_WAITKIND_SPURIOUS
:
1443 resume (0, TARGET_SIGNAL_0
);
1446 case TARGET_WAITKIND_EXITED
:
1447 target_terminal_ours (); /* Must do this before mourn anyway */
1448 annotate_exited (ecs
->ws
.value
.integer
);
1449 if (ecs
->ws
.value
.integer
)
1450 printf_filtered ("\nProgram exited with code 0%o.\n",
1451 (unsigned int) ecs
->ws
.value
.integer
);
1453 printf_filtered ("\nProgram exited normally.\n");
1455 /* Record the exit code in the convenience variable $_exitcode, so
1456 that the user can inspect this again later. */
1457 set_internalvar (lookup_internalvar ("_exitcode"),
1458 value_from_longest (builtin_type_int
,
1459 (LONGEST
) ecs
->ws
.value
.integer
));
1460 gdb_flush (gdb_stdout
);
1461 target_mourn_inferior ();
1462 singlestep_breakpoints_inserted_p
= 0; /*SOFTWARE_SINGLE_STEP_P */
1463 stop_print_frame
= 0;
1466 case TARGET_WAITKIND_SIGNALLED
:
1467 stop_print_frame
= 0;
1468 stop_signal
= ecs
->ws
.value
.sig
;
1469 target_terminal_ours (); /* Must do this before mourn anyway */
1470 annotate_signalled ();
1472 /* This looks pretty bogus to me. Doesn't TARGET_WAITKIND_SIGNALLED
1473 mean it is already dead? This has been here since GDB 2.8, so
1474 perhaps it means rms didn't understand unix waitstatuses?
1475 For the moment I'm just kludging around this in remote.c
1476 rather than trying to change it here --kingdon, 5 Dec 1994. */
1477 target_kill (); /* kill mourns as well */
1479 printf_filtered ("\nProgram terminated with signal ");
1480 annotate_signal_name ();
1481 printf_filtered ("%s", target_signal_to_name (stop_signal
));
1482 annotate_signal_name_end ();
1483 printf_filtered (", ");
1484 annotate_signal_string ();
1485 printf_filtered ("%s", target_signal_to_string (stop_signal
));
1486 annotate_signal_string_end ();
1487 printf_filtered (".\n");
1489 printf_filtered ("The program no longer exists.\n");
1490 gdb_flush (gdb_stdout
);
1491 singlestep_breakpoints_inserted_p
= 0; /*SOFTWARE_SINGLE_STEP_P */
1494 /* The following are the only cases in which we keep going;
1495 the above cases end in a continue or goto. */
1496 case TARGET_WAITKIND_FORKED
:
1497 stop_signal
= TARGET_SIGNAL_TRAP
;
1498 pending_follow
.kind
= ecs
->ws
.kind
;
1500 /* Ignore fork events reported for the parent; we're only
1501 interested in reacting to forks of the child. Note that
1502 we expect the child's fork event to be available if we
1503 waited for it now. */
1504 if (inferior_pid
== ecs
->pid
)
1506 pending_follow
.fork_event
.saw_parent_fork
= 1;
1507 pending_follow
.fork_event
.parent_pid
= ecs
->pid
;
1508 pending_follow
.fork_event
.child_pid
= ecs
->ws
.value
.related_pid
;
1513 pending_follow
.fork_event
.saw_child_fork
= 1;
1514 pending_follow
.fork_event
.child_pid
= ecs
->pid
;
1515 pending_follow
.fork_event
.parent_pid
= ecs
->ws
.value
.related_pid
;
1518 stop_pc
= read_pc_pid (ecs
->pid
);
1519 ecs
->saved_inferior_pid
= inferior_pid
;
1520 inferior_pid
= ecs
->pid
;
1521 stop_bpstat
= bpstat_stop_status
1523 (DECR_PC_AFTER_BREAK
?
1524 (prev_pc
!= stop_pc
- DECR_PC_AFTER_BREAK
1525 && currently_stepping (ecs
))
1528 ecs
->random_signal
= !bpstat_explains_signal (stop_bpstat
);
1529 inferior_pid
= ecs
->saved_inferior_pid
;
1530 goto process_event_stop_test
;
1532 /* If this a platform which doesn't allow a debugger to touch a
1533 vfork'd inferior until after it exec's, then we'd best keep
1534 our fingers entirely off the inferior, other than continuing
1535 it. This has the unfortunate side-effect that catchpoints
1536 of vforks will be ignored. But since the platform doesn't
1537 allow the inferior be touched at vfork time, there's really
1539 case TARGET_WAITKIND_VFORKED
:
1540 stop_signal
= TARGET_SIGNAL_TRAP
;
1541 pending_follow
.kind
= ecs
->ws
.kind
;
1543 /* Is this a vfork of the parent? If so, then give any
1544 vfork catchpoints a chance to trigger now. (It's
1545 dangerous to do so if the child canot be touched until
1546 it execs, and the child has not yet exec'd. We probably
1547 should warn the user to that effect when the catchpoint
1549 if (ecs
->pid
== inferior_pid
)
1551 pending_follow
.fork_event
.saw_parent_fork
= 1;
1552 pending_follow
.fork_event
.parent_pid
= ecs
->pid
;
1553 pending_follow
.fork_event
.child_pid
= ecs
->ws
.value
.related_pid
;
1556 /* If we've seen the child's vfork event but cannot really touch
1557 the child until it execs, then we must continue the child now.
1558 Else, give any vfork catchpoints a chance to trigger now. */
1561 pending_follow
.fork_event
.saw_child_fork
= 1;
1562 pending_follow
.fork_event
.child_pid
= ecs
->pid
;
1563 pending_follow
.fork_event
.parent_pid
= ecs
->ws
.value
.related_pid
;
1564 target_post_startup_inferior (pending_follow
.fork_event
.child_pid
);
1565 follow_vfork_when_exec
= !target_can_follow_vfork_prior_to_exec ();
1566 if (follow_vfork_when_exec
)
1568 target_resume (ecs
->pid
, 0, TARGET_SIGNAL_0
);
1573 stop_pc
= read_pc ();
1574 stop_bpstat
= bpstat_stop_status
1576 (DECR_PC_AFTER_BREAK
?
1577 (prev_pc
!= stop_pc
- DECR_PC_AFTER_BREAK
1578 && currently_stepping (ecs
))
1581 ecs
->random_signal
= !bpstat_explains_signal (stop_bpstat
);
1582 goto process_event_stop_test
;
1584 case TARGET_WAITKIND_EXECD
:
1585 stop_signal
= TARGET_SIGNAL_TRAP
;
1587 /* Is this a target which reports multiple exec events per actual
1588 call to exec()? (HP-UX using ptrace does, for example.) If so,
1589 ignore all but the last one. Just resume the exec'r, and wait
1590 for the next exec event. */
1591 if (inferior_ignoring_leading_exec_events
)
1593 inferior_ignoring_leading_exec_events
--;
1594 if (pending_follow
.kind
== TARGET_WAITKIND_VFORKED
)
1595 ENSURE_VFORKING_PARENT_REMAINS_STOPPED (pending_follow
.fork_event
.parent_pid
);
1596 target_resume (ecs
->pid
, 0, TARGET_SIGNAL_0
);
1599 inferior_ignoring_leading_exec_events
=
1600 target_reported_exec_events_per_exec_call () - 1;
1602 pending_follow
.execd_pathname
= savestring (ecs
->ws
.value
.execd_pathname
,
1603 strlen (ecs
->ws
.value
.execd_pathname
));
1605 /* Did inferior_pid exec, or did a (possibly not-yet-followed)
1606 child of a vfork exec?
1608 ??rehrauer: This is unabashedly an HP-UX specific thing. On
1609 HP-UX, events associated with a vforking inferior come in
1610 threes: a vfork event for the child (always first), followed
1611 a vfork event for the parent and an exec event for the child.
1612 The latter two can come in either order.
1614 If we get the parent vfork event first, life's good: We follow
1615 either the parent or child, and then the child's exec event is
1618 But if we get the child's exec event first, then we delay
1619 responding to it until we handle the parent's vfork. Because,
1620 otherwise we can't satisfy a "catch vfork". */
1621 if (pending_follow
.kind
== TARGET_WAITKIND_VFORKED
)
1623 pending_follow
.fork_event
.saw_child_exec
= 1;
1625 /* On some targets, the child must be resumed before
1626 the parent vfork event is delivered. A single-step
1628 if (RESUME_EXECD_VFORKING_CHILD_TO_GET_PARENT_VFORK ())
1629 target_resume (ecs
->pid
, 1, TARGET_SIGNAL_0
);
1630 /* We expect the parent vfork event to be available now. */
1634 /* This causes the eventpoints and symbol table to be reset. Must
1635 do this now, before trying to determine whether to stop. */
1636 follow_exec (inferior_pid
, pending_follow
.execd_pathname
);
1637 free (pending_follow
.execd_pathname
);
1639 stop_pc
= read_pc_pid (ecs
->pid
);
1640 ecs
->saved_inferior_pid
= inferior_pid
;
1641 inferior_pid
= ecs
->pid
;
1642 stop_bpstat
= bpstat_stop_status
1644 (DECR_PC_AFTER_BREAK
?
1645 (prev_pc
!= stop_pc
- DECR_PC_AFTER_BREAK
1646 && currently_stepping (ecs
))
1649 ecs
->random_signal
= !bpstat_explains_signal (stop_bpstat
);
1650 inferior_pid
= ecs
->saved_inferior_pid
;
1651 goto process_event_stop_test
;
1653 /* These syscall events are returned on HP-UX, as part of its
1654 implementation of page-protection-based "hardware" watchpoints.
1655 HP-UX has unfortunate interactions between page-protections and
1656 some system calls. Our solution is to disable hardware watches
1657 when a system call is entered, and reenable them when the syscall
1658 completes. The downside of this is that we may miss the precise
1659 point at which a watched piece of memory is modified. "Oh well."
1661 Note that we may have multiple threads running, which may each
1662 enter syscalls at roughly the same time. Since we don't have a
1663 good notion currently of whether a watched piece of memory is
1664 thread-private, we'd best not have any page-protections active
1665 when any thread is in a syscall. Thus, we only want to reenable
1666 hardware watches when no threads are in a syscall.
1668 Also, be careful not to try to gather much state about a thread
1669 that's in a syscall. It's frequently a losing proposition. */
1670 case TARGET_WAITKIND_SYSCALL_ENTRY
:
1671 number_of_threads_in_syscalls
++;
1672 if (number_of_threads_in_syscalls
== 1)
1674 TARGET_DISABLE_HW_WATCHPOINTS (inferior_pid
);
1676 resume (0, TARGET_SIGNAL_0
);
1679 /* Before examining the threads further, step this thread to
1680 get it entirely out of the syscall. (We get notice of the
1681 event when the thread is just on the verge of exiting a
1682 syscall. Stepping one instruction seems to get it back
1685 Note that although the logical place to reenable h/w watches
1686 is here, we cannot. We cannot reenable them before stepping
1687 the thread (this causes the next wait on the thread to hang).
1689 Nor can we enable them after stepping until we've done a wait.
1690 Thus, we simply set the flag ecs->enable_hw_watchpoints_after_wait
1691 here, which will be serviced immediately after the target
1693 case TARGET_WAITKIND_SYSCALL_RETURN
:
1694 target_resume (ecs
->pid
, 1, TARGET_SIGNAL_0
);
1696 if (number_of_threads_in_syscalls
> 0)
1698 number_of_threads_in_syscalls
--;
1699 ecs
->enable_hw_watchpoints_after_wait
=
1700 (number_of_threads_in_syscalls
== 0);
1704 case TARGET_WAITKIND_STOPPED
:
1705 stop_signal
= ecs
->ws
.value
.sig
;
1709 /* We may want to consider not doing a resume here in order to give
1710 the user a chance to play with the new thread. It might be good
1711 to make that a user-settable option. */
1713 /* At this point, all threads are stopped (happens automatically in
1714 either the OS or the native code). Therefore we need to continue
1715 all threads in order to make progress. */
1716 if (ecs
->new_thread_event
)
1718 target_resume (-1, 0, TARGET_SIGNAL_0
);
1722 stop_pc
= read_pc_pid (ecs
->pid
);
1724 /* See if a thread hit a thread-specific breakpoint that was meant for
1725 another thread. If so, then step that thread past the breakpoint,
1728 if (stop_signal
== TARGET_SIGNAL_TRAP
)
1730 if (SOFTWARE_SINGLE_STEP_P
&& singlestep_breakpoints_inserted_p
)
1731 ecs
->random_signal
= 0;
1732 else if (breakpoints_inserted
1733 && breakpoint_here_p (stop_pc
- DECR_PC_AFTER_BREAK
))
1735 ecs
->random_signal
= 0;
1736 if (!breakpoint_thread_match (stop_pc
- DECR_PC_AFTER_BREAK
,
1741 /* Saw a breakpoint, but it was hit by the wrong thread.
1743 write_pc_pid (stop_pc
- DECR_PC_AFTER_BREAK
, ecs
->pid
);
1745 remove_status
= remove_breakpoints ();
1746 /* Did we fail to remove breakpoints? If so, try
1747 to set the PC past the bp. (There's at least
1748 one situation in which we can fail to remove
1749 the bp's: On HP-UX's that use ttrace, we can't
1750 change the address space of a vforking child
1751 process until the child exits (well, okay, not
1752 then either :-) or execs. */
1753 if (remove_status
!= 0)
1755 write_pc_pid (stop_pc
- DECR_PC_AFTER_BREAK
+ 4, ecs
->pid
);
1759 target_resume (ecs
->pid
, 1, TARGET_SIGNAL_0
);
1760 /* FIXME: What if a signal arrives instead of the
1761 single-step happening? */
1763 ecs
->waiton_pid
= ecs
->pid
;
1764 ecs
->wp
= &(ecs
->ws
);
1765 ecs
->infwait_state
= infwait_thread_hop_state
;
1769 /* We need to restart all the threads now,
1770 * unles we're running in scheduler-locked mode.
1771 * FIXME: shouldn't we look at currently_stepping ()?
1773 if (scheduler_mode
== schedlock_on
)
1774 target_resume (ecs
->pid
, 0, TARGET_SIGNAL_0
);
1776 target_resume (-1, 0, TARGET_SIGNAL_0
);
1781 /* This breakpoint matches--either it is the right
1782 thread or it's a generic breakpoint for all threads.
1783 Remember that we'll need to step just _this_ thread
1784 on any following user continuation! */
1785 thread_step_needed
= 1;
1790 ecs
->random_signal
= 1;
1792 /* See if something interesting happened to the non-current thread. If
1793 so, then switch to that thread, and eventually give control back to
1796 Note that if there's any kind of pending follow (i.e., of a fork,
1797 vfork or exec), we don't want to do this now. Rather, we'll let
1798 the next resume handle it. */
1799 if ((ecs
->pid
!= inferior_pid
) &&
1800 (pending_follow
.kind
== TARGET_WAITKIND_SPURIOUS
))
1804 /* If it's a random signal for a non-current thread, notify user
1805 if he's expressed an interest. */
1806 if (ecs
->random_signal
1807 && signal_print
[stop_signal
])
1809 /* ??rehrauer: I don't understand the rationale for this code. If the
1810 inferior will stop as a result of this signal, then the act of handling
1811 the stop ought to print a message that's couches the stoppage in user
1812 terms, e.g., "Stopped for breakpoint/watchpoint". If the inferior
1813 won't stop as a result of the signal -- i.e., if the signal is merely
1814 a side-effect of something GDB's doing "under the covers" for the
1815 user, such as stepping threads over a breakpoint they shouldn't stop
1816 for -- then the message seems to be a serious annoyance at best.
1818 For now, remove the message altogether. */
1821 target_terminal_ours_for_output ();
1822 printf_filtered ("\nProgram received signal %s, %s.\n",
1823 target_signal_to_name (stop_signal
),
1824 target_signal_to_string (stop_signal
));
1825 gdb_flush (gdb_stdout
);
1829 /* If it's not SIGTRAP and not a signal we want to stop for, then
1830 continue the thread. */
1832 if (stop_signal
!= TARGET_SIGNAL_TRAP
1833 && !signal_stop
[stop_signal
])
1836 target_terminal_inferior ();
1838 /* Clear the signal if it should not be passed. */
1839 if (signal_program
[stop_signal
] == 0)
1840 stop_signal
= TARGET_SIGNAL_0
;
1842 target_resume (ecs
->pid
, 0, stop_signal
);
1846 /* It's a SIGTRAP or a signal we're interested in. Switch threads,
1847 and fall into the rest of wait_for_inferior(). */
1849 /* Save infrun state for the old thread. */
1850 save_infrun_state (inferior_pid
, prev_pc
,
1851 prev_func_start
, prev_func_name
,
1852 trap_expected
, step_resume_breakpoint
,
1853 through_sigtramp_breakpoint
,
1854 step_range_start
, step_range_end
,
1855 step_frame_address
, ecs
->handling_longjmp
,
1857 ecs
->stepping_through_solib_after_catch
,
1858 ecs
->stepping_through_solib_catchpoints
,
1859 ecs
->stepping_through_sigtramp
);
1861 if (may_switch_from_inferior_pid
)
1862 switched_from_inferior_pid
= inferior_pid
;
1864 inferior_pid
= ecs
->pid
;
1866 /* Load infrun state for the new thread. */
1867 load_infrun_state (inferior_pid
, &prev_pc
,
1868 &prev_func_start
, &prev_func_name
,
1869 &trap_expected
, &step_resume_breakpoint
,
1870 &through_sigtramp_breakpoint
,
1871 &step_range_start
, &step_range_end
,
1872 &step_frame_address
, &ecs
->handling_longjmp
,
1874 &ecs
->stepping_through_solib_after_catch
,
1875 &ecs
->stepping_through_solib_catchpoints
,
1876 &ecs
->stepping_through_sigtramp
);
1879 context_hook (pid_to_thread_id (ecs
->pid
));
1881 printf_filtered ("[Switching to %s]\n", target_pid_to_str (ecs
->pid
));
1882 flush_cached_frames ();
1885 if (SOFTWARE_SINGLE_STEP_P
&& singlestep_breakpoints_inserted_p
)
1887 /* Pull the single step breakpoints out of the target. */
1888 SOFTWARE_SINGLE_STEP (0, 0);
1889 singlestep_breakpoints_inserted_p
= 0;
1892 /* If PC is pointing at a nullified instruction, then step beyond
1893 it so that the user won't be confused when GDB appears to be ready
1896 /* if (INSTRUCTION_NULLIFIED && currently_stepping (ecs)) */
1897 if (INSTRUCTION_NULLIFIED
)
1899 registers_changed ();
1900 target_resume (ecs
->pid
, 1, TARGET_SIGNAL_0
);
1902 /* We may have received a signal that we want to pass to
1903 the inferior; therefore, we must not clobber the waitstatus
1906 ecs
->infwait_state
= infwait_nullified_state
;
1907 ecs
->waiton_pid
= ecs
->pid
;
1908 ecs
->wp
= &(ecs
->tmpstatus
);
1912 /* It may not be necessary to disable the watchpoint to stop over
1913 it. For example, the PA can (with some kernel cooperation)
1914 single step over a watchpoint without disabling the watchpoint. */
1915 if (HAVE_STEPPABLE_WATCHPOINT
&& STOPPED_BY_WATCHPOINT (ecs
->ws
))
1921 /* It is far more common to need to disable a watchpoint to step
1922 the inferior over it. FIXME. What else might a debug
1923 register or page protection watchpoint scheme need here? */
1924 if (HAVE_NONSTEPPABLE_WATCHPOINT
&& STOPPED_BY_WATCHPOINT (ecs
->ws
))
1926 /* At this point, we are stopped at an instruction which has
1927 attempted to write to a piece of memory under control of
1928 a watchpoint. The instruction hasn't actually executed
1929 yet. If we were to evaluate the watchpoint expression
1930 now, we would get the old value, and therefore no change
1931 would seem to have occurred.
1933 In order to make watchpoints work `right', we really need
1934 to complete the memory write, and then evaluate the
1935 watchpoint expression. The following code does that by
1936 removing the watchpoint (actually, all watchpoints and
1937 breakpoints), single-stepping the target, re-inserting
1938 watchpoints, and then falling through to let normal
1939 single-step processing handle proceed. Since this
1940 includes evaluating watchpoints, things will come to a
1941 stop in the correct manner. */
1943 write_pc (stop_pc
- DECR_PC_AFTER_BREAK
);
1945 remove_breakpoints ();
1946 registers_changed ();
1947 target_resume (ecs
->pid
, 1, TARGET_SIGNAL_0
); /* Single step */
1949 ecs
->waiton_pid
= ecs
->pid
;
1950 ecs
->wp
= &(ecs
->ws
);
1951 ecs
->infwait_state
= infwait_nonstep_watch_state
;
1955 /* It may be possible to simply continue after a watchpoint. */
1956 if (HAVE_CONTINUABLE_WATCHPOINT
)
1957 STOPPED_BY_WATCHPOINT (ecs
->ws
);
1959 ecs
->stop_func_start
= 0;
1960 ecs
->stop_func_end
= 0;
1961 ecs
->stop_func_name
= 0;
1962 /* Don't care about return value; stop_func_start and stop_func_name
1963 will both be 0 if it doesn't work. */
1964 find_pc_partial_function (stop_pc
, &ecs
->stop_func_name
,
1965 &ecs
->stop_func_start
, &ecs
->stop_func_end
);
1966 ecs
->stop_func_start
+= FUNCTION_START_OFFSET
;
1967 ecs
->another_trap
= 0;
1968 bpstat_clear (&stop_bpstat
);
1970 stop_stack_dummy
= 0;
1971 stop_print_frame
= 1;
1972 ecs
->random_signal
= 0;
1973 stopped_by_random_signal
= 0;
1974 breakpoints_failed
= 0;
1976 /* Look at the cause of the stop, and decide what to do.
1977 The alternatives are:
1978 1) break; to really stop and return to the debugger,
1979 2) drop through to start up again
1980 (set ecs->another_trap to 1 to single step once)
1981 3) set ecs->random_signal to 1, and the decision between 1 and 2
1982 will be made according to the signal handling tables. */
1984 /* First, distinguish signals caused by the debugger from signals
1985 that have to do with the program's own actions.
1986 Note that breakpoint insns may cause SIGTRAP or SIGILL
1987 or SIGEMT, depending on the operating system version.
1988 Here we detect when a SIGILL or SIGEMT is really a breakpoint
1989 and change it to SIGTRAP. */
1991 if (stop_signal
== TARGET_SIGNAL_TRAP
1992 || (breakpoints_inserted
&&
1993 (stop_signal
== TARGET_SIGNAL_ILL
1994 || stop_signal
== TARGET_SIGNAL_EMT
1996 || stop_soon_quietly
)
1998 if (stop_signal
== TARGET_SIGNAL_TRAP
&& stop_after_trap
)
2000 stop_print_frame
= 0;
2003 if (stop_soon_quietly
)
2006 /* Don't even think about breakpoints
2007 if just proceeded over a breakpoint.
2009 However, if we are trying to proceed over a breakpoint
2010 and end up in sigtramp, then through_sigtramp_breakpoint
2011 will be set and we should check whether we've hit the
2013 if (stop_signal
== TARGET_SIGNAL_TRAP
&& trap_expected
2014 && through_sigtramp_breakpoint
== NULL
)
2015 bpstat_clear (&stop_bpstat
);
2018 /* See if there is a breakpoint at the current PC. */
2019 stop_bpstat
= bpstat_stop_status
2021 (DECR_PC_AFTER_BREAK
?
2022 /* Notice the case of stepping through a jump
2023 that lands just after a breakpoint.
2024 Don't confuse that with hitting the breakpoint.
2025 What we check for is that 1) stepping is going on
2026 and 2) the pc before the last insn does not match
2027 the address of the breakpoint before the current pc
2028 and 3) we didn't hit a breakpoint in a signal handler
2029 without an intervening stop in sigtramp, which is
2030 detected by a new stack pointer value below
2031 any usual function calling stack adjustments. */
2032 (currently_stepping (ecs
)
2033 && prev_pc
!= stop_pc
- DECR_PC_AFTER_BREAK
2035 && INNER_THAN (read_sp (), (step_sp
- 16)))) :
2038 /* Following in case break condition called a
2040 stop_print_frame
= 1;
2043 if (stop_signal
== TARGET_SIGNAL_TRAP
)
2045 = !(bpstat_explains_signal (stop_bpstat
)
2047 || (!CALL_DUMMY_BREAKPOINT_OFFSET_P
2048 && PC_IN_CALL_DUMMY (stop_pc
, read_sp (),
2049 FRAME_FP (get_current_frame ())))
2050 || (step_range_end
&& step_resume_breakpoint
== NULL
));
2055 = !(bpstat_explains_signal (stop_bpstat
)
2056 /* End of a stack dummy. Some systems (e.g. Sony
2057 news) give another signal besides SIGTRAP, so
2058 check here as well as above. */
2059 || (!CALL_DUMMY_BREAKPOINT_OFFSET_P
2060 && PC_IN_CALL_DUMMY (stop_pc
, read_sp (),
2061 FRAME_FP (get_current_frame ())))
2063 if (!ecs
->random_signal
)
2064 stop_signal
= TARGET_SIGNAL_TRAP
;
2068 /* When we reach this point, we've pretty much decided
2069 that the reason for stopping must've been a random
2070 (unexpected) signal. */
2073 ecs
->random_signal
= 1;
2074 /* If a fork, vfork or exec event was seen, then there are two
2075 possible responses we can make:
2077 1. If a catchpoint triggers for the event (ecs->random_signal == 0),
2078 then we must stop now and issue a prompt. We will resume
2079 the inferior when the user tells us to.
2080 2. If no catchpoint triggers for the event (ecs->random_signal == 1),
2081 then we must resume the inferior now and keep checking.
2083 In either case, we must take appropriate steps to "follow" the
2084 the fork/vfork/exec when the inferior is resumed. For example,
2085 if follow-fork-mode is "child", then we must detach from the
2086 parent inferior and follow the new child inferior.
2088 In either case, setting pending_follow causes the next resume()
2089 to take the appropriate following action. */
2090 process_event_stop_test
:
2091 if (ecs
->ws
.kind
== TARGET_WAITKIND_FORKED
)
2093 if (ecs
->random_signal
) /* I.e., no catchpoint triggered for this. */
2096 stop_signal
= TARGET_SIGNAL_0
;
2100 else if (ecs
->ws
.kind
== TARGET_WAITKIND_VFORKED
)
2102 if (ecs
->random_signal
) /* I.e., no catchpoint triggered for this. */
2104 stop_signal
= TARGET_SIGNAL_0
;
2108 else if (ecs
->ws
.kind
== TARGET_WAITKIND_EXECD
)
2110 pending_follow
.kind
= ecs
->ws
.kind
;
2111 if (ecs
->random_signal
) /* I.e., no catchpoint triggered for this. */
2114 stop_signal
= TARGET_SIGNAL_0
;
2119 /* For the program's own signals, act according to
2120 the signal handling tables. */
2122 if (ecs
->random_signal
)
2124 /* Signal not for debugging purposes. */
2127 stopped_by_random_signal
= 1;
2129 if (signal_print
[stop_signal
])
2132 target_terminal_ours_for_output ();
2134 printf_filtered ("\nProgram received signal ");
2135 annotate_signal_name ();
2136 printf_filtered ("%s", target_signal_to_name (stop_signal
));
2137 annotate_signal_name_end ();
2138 printf_filtered (", ");
2139 annotate_signal_string ();
2140 printf_filtered ("%s", target_signal_to_string (stop_signal
));
2141 annotate_signal_string_end ();
2142 printf_filtered (".\n");
2143 gdb_flush (gdb_stdout
);
2145 if (signal_stop
[stop_signal
])
2147 /* If not going to stop, give terminal back
2148 if we took it away. */
2150 target_terminal_inferior ();
2152 /* Clear the signal if it should not be passed. */
2153 if (signal_program
[stop_signal
] == 0)
2154 stop_signal
= TARGET_SIGNAL_0
;
2156 /* I'm not sure whether this needs to be check_sigtramp2 or
2157 whether it could/should be keep_going.
2159 This used to jump to step_over_function if we are stepping,
2162 Suppose the user does a `next' over a function call, and while
2163 that call is in progress, the inferior receives a signal for
2164 which GDB does not stop (i.e., signal_stop[SIG] is false). In
2165 that case, when we reach this point, there is already a
2166 step-resume breakpoint established, right where it should be:
2167 immediately after the function call the user is "next"-ing
2168 over. If we jump to step_over_function now, two bad things
2171 - we'll create a new breakpoint, at wherever the current
2172 frame's return address happens to be. That could be
2173 anywhere, depending on what function call happens to be on
2174 the top of the stack at that point. Point is, it's probably
2175 not where we need it.
2177 - the existing step-resume breakpoint (which is at the correct
2178 address) will get orphaned: step_resume_breakpoint will point
2179 to the new breakpoint, and the old step-resume breakpoint
2180 will never be cleaned up.
2182 The old behavior was meant to help HP-UX single-step out of
2183 sigtramps. It would place the new breakpoint at prev_pc, which
2184 was certainly wrong. I don't know the details there, so fixing
2185 this probably breaks that. As with anything else, it's up to
2186 the HP-UX maintainer to furnish a fix that doesn't break other
2187 platforms. --JimB, 20 May 1999 */
2188 goto check_sigtramp2
;
2191 /* Handle cases caused by hitting a breakpoint. */
2193 CORE_ADDR jmp_buf_pc
;
2194 struct bpstat_what what
;
2196 what
= bpstat_what (stop_bpstat
);
2198 if (what
.call_dummy
)
2200 stop_stack_dummy
= 1;
2202 trap_expected_after_continue
= 1;
2206 switch (what
.main_action
)
2208 case BPSTAT_WHAT_SET_LONGJMP_RESUME
:
2209 /* If we hit the breakpoint at longjmp, disable it for the
2210 duration of this command. Then, install a temporary
2211 breakpoint at the target of the jmp_buf. */
2212 disable_longjmp_breakpoint ();
2213 remove_breakpoints ();
2214 breakpoints_inserted
= 0;
2215 if (!GET_LONGJMP_TARGET (&jmp_buf_pc
))
2218 /* Need to blow away step-resume breakpoint, as it
2219 interferes with us */
2220 if (step_resume_breakpoint
!= NULL
)
2222 delete_breakpoint (step_resume_breakpoint
);
2223 step_resume_breakpoint
= NULL
;
2225 /* Not sure whether we need to blow this away too, but probably
2226 it is like the step-resume breakpoint. */
2227 if (through_sigtramp_breakpoint
!= NULL
)
2229 delete_breakpoint (through_sigtramp_breakpoint
);
2230 through_sigtramp_breakpoint
= NULL
;
2234 /* FIXME - Need to implement nested temporary breakpoints */
2235 if (step_over_calls
> 0)
2236 set_longjmp_resume_breakpoint (jmp_buf_pc
,
2237 get_current_frame ());
2240 set_longjmp_resume_breakpoint (jmp_buf_pc
, NULL
);
2241 ecs
->handling_longjmp
= 1; /* FIXME */
2244 case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME
:
2245 case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME_SINGLE
:
2246 remove_breakpoints ();
2247 breakpoints_inserted
= 0;
2249 /* FIXME - Need to implement nested temporary breakpoints */
2251 && (INNER_THAN (FRAME_FP (get_current_frame ()),
2252 step_frame_address
)))
2254 ecs
->another_trap
= 1;
2258 disable_longjmp_breakpoint ();
2259 ecs
->handling_longjmp
= 0; /* FIXME */
2260 if (what
.main_action
== BPSTAT_WHAT_CLEAR_LONGJMP_RESUME
)
2262 /* else fallthrough */
2264 case BPSTAT_WHAT_SINGLE
:
2265 if (breakpoints_inserted
)
2267 thread_step_needed
= 1;
2268 remove_breakpoints ();
2270 breakpoints_inserted
= 0;
2271 ecs
->another_trap
= 1;
2272 /* Still need to check other stuff, at least the case
2273 where we are stepping and step out of the right range. */
2276 case BPSTAT_WHAT_STOP_NOISY
:
2277 stop_print_frame
= 1;
2279 /* We are about to nuke the step_resume_breakpoint and
2280 through_sigtramp_breakpoint via the cleanup chain, so
2281 no need to worry about it here. */
2285 case BPSTAT_WHAT_STOP_SILENT
:
2286 stop_print_frame
= 0;
2288 /* We are about to nuke the step_resume_breakpoint and
2289 through_sigtramp_breakpoint via the cleanup chain, so
2290 no need to worry about it here. */
2294 case BPSTAT_WHAT_STEP_RESUME
:
2295 /* This proably demands a more elegant solution, but, yeah
2298 This function's use of the simple variable
2299 step_resume_breakpoint doesn't seem to accomodate
2300 simultaneously active step-resume bp's, although the
2301 breakpoint list certainly can.
2303 If we reach here and step_resume_breakpoint is already
2304 NULL, then apparently we have multiple active
2305 step-resume bp's. We'll just delete the breakpoint we
2306 stopped at, and carry on. */
2307 if (step_resume_breakpoint
== NULL
)
2309 step_resume_breakpoint
=
2310 bpstat_find_step_resume_breakpoint (stop_bpstat
);
2312 delete_breakpoint (step_resume_breakpoint
);
2313 step_resume_breakpoint
= NULL
;
2316 case BPSTAT_WHAT_THROUGH_SIGTRAMP
:
2317 if (through_sigtramp_breakpoint
)
2318 delete_breakpoint (through_sigtramp_breakpoint
);
2319 through_sigtramp_breakpoint
= NULL
;
2321 /* If were waiting for a trap, hitting the step_resume_break
2322 doesn't count as getting it. */
2324 ecs
->another_trap
= 1;
2327 case BPSTAT_WHAT_CHECK_SHLIBS
:
2328 case BPSTAT_WHAT_CHECK_SHLIBS_RESUME_FROM_HOOK
:
2331 /* Remove breakpoints, we eventually want to step over the
2332 shlib event breakpoint, and SOLIB_ADD might adjust
2333 breakpoint addresses via breakpoint_re_set. */
2334 if (breakpoints_inserted
)
2335 remove_breakpoints ();
2336 breakpoints_inserted
= 0;
2338 /* Check for any newly added shared libraries if we're
2339 supposed to be adding them automatically. */
2342 /* Switch terminal for any messages produced by
2343 breakpoint_re_set. */
2344 target_terminal_ours_for_output ();
2345 SOLIB_ADD (NULL
, 0, NULL
);
2346 target_terminal_inferior ();
2349 /* Try to reenable shared library breakpoints, additional
2350 code segments in shared libraries might be mapped in now. */
2351 re_enable_breakpoints_in_shlibs ();
2353 /* If requested, stop when the dynamic linker notifies
2354 gdb of events. This allows the user to get control
2355 and place breakpoints in initializer routines for
2356 dynamically loaded objects (among other things). */
2357 if (stop_on_solib_events
)
2359 stop_print_frame
= 0;
2363 /* If we stopped due to an explicit catchpoint, then the
2364 (see above) call to SOLIB_ADD pulled in any symbols
2365 from a newly-loaded library, if appropriate.
2367 We do want the inferior to stop, but not where it is
2368 now, which is in the dynamic linker callback. Rather,
2369 we would like it stop in the user's program, just after
2370 the call that caused this catchpoint to trigger. That
2371 gives the user a more useful vantage from which to
2372 examine their program's state. */
2373 else if (what
.main_action
== BPSTAT_WHAT_CHECK_SHLIBS_RESUME_FROM_HOOK
)
2375 /* ??rehrauer: If I could figure out how to get the
2376 right return PC from here, we could just set a temp
2377 breakpoint and resume. I'm not sure we can without
2378 cracking open the dld's shared libraries and sniffing
2379 their unwind tables and text/data ranges, and that's
2380 not a terribly portable notion.
2382 Until that time, we must step the inferior out of the
2383 dld callback, and also out of the dld itself (and any
2384 code or stubs in libdld.sl, such as "shl_load" and
2385 friends) until we reach non-dld code. At that point,
2386 we can stop stepping. */
2387 bpstat_get_triggered_catchpoints (stop_bpstat
,
2388 &ecs
->stepping_through_solib_catchpoints
);
2389 ecs
->stepping_through_solib_after_catch
= 1;
2391 /* Be sure to lift all breakpoints, so the inferior does
2392 actually step past this point... */
2393 ecs
->another_trap
= 1;
2398 /* We want to step over this breakpoint, then keep going. */
2399 ecs
->another_trap
= 1;
2406 case BPSTAT_WHAT_LAST
:
2407 /* Not a real code, but listed here to shut up gcc -Wall. */
2409 case BPSTAT_WHAT_KEEP_CHECKING
:
2414 /* We come here if we hit a breakpoint but should not
2415 stop for it. Possibly we also were stepping
2416 and should stop for that. So fall through and
2417 test for stepping. But, if not stepping,
2420 /* Are we stepping to get the inferior out of the dynamic
2421 linker's hook (and possibly the dld itself) after catching
2423 if (ecs
->stepping_through_solib_after_catch
)
2425 #if defined(SOLIB_ADD)
2426 /* Have we reached our destination? If not, keep going. */
2427 if (SOLIB_IN_DYNAMIC_LINKER (ecs
->pid
, stop_pc
))
2429 ecs
->another_trap
= 1;
2433 /* Else, stop and report the catchpoint(s) whose triggering
2434 caused us to begin stepping. */
2435 ecs
->stepping_through_solib_after_catch
= 0;
2436 bpstat_clear (&stop_bpstat
);
2437 stop_bpstat
= bpstat_copy (ecs
->stepping_through_solib_catchpoints
);
2438 bpstat_clear (&ecs
->stepping_through_solib_catchpoints
);
2439 stop_print_frame
= 1;
2443 if (!CALL_DUMMY_BREAKPOINT_OFFSET_P
)
2445 /* This is the old way of detecting the end of the stack dummy.
2446 An architecture which defines CALL_DUMMY_BREAKPOINT_OFFSET gets
2447 handled above. As soon as we can test it on all of them, all
2448 architectures should define it. */
2450 /* If this is the breakpoint at the end of a stack dummy,
2451 just stop silently, unless the user was doing an si/ni, in which
2452 case she'd better know what she's doing. */
2454 if (CALL_DUMMY_HAS_COMPLETED (stop_pc
, read_sp (),
2455 FRAME_FP (get_current_frame ()))
2458 stop_print_frame
= 0;
2459 stop_stack_dummy
= 1;
2461 trap_expected_after_continue
= 1;
2467 if (step_resume_breakpoint
)
2468 /* Having a step-resume breakpoint overrides anything
2469 else having to do with stepping commands until
2470 that breakpoint is reached. */
2471 /* I'm not sure whether this needs to be check_sigtramp2 or
2472 whether it could/should be keep_going. */
2473 goto check_sigtramp2
;
2475 if (step_range_end
== 0)
2476 /* Likewise if we aren't even stepping. */
2477 /* I'm not sure whether this needs to be check_sigtramp2 or
2478 whether it could/should be keep_going. */
2479 goto check_sigtramp2
;
2481 /* If stepping through a line, keep going if still within it.
2483 Note that step_range_end is the address of the first instruction
2484 beyond the step range, and NOT the address of the last instruction
2486 if (stop_pc
>= step_range_start
2487 && stop_pc
< step_range_end
)
2489 /* We might be doing a BPSTAT_WHAT_SINGLE and getting a signal.
2490 So definately need to check for sigtramp here. */
2491 goto check_sigtramp2
;
2494 /* We stepped out of the stepping range. */
2496 /* If we are stepping at the source level and entered the runtime
2497 loader dynamic symbol resolution code, we keep on single stepping
2498 until we exit the run time loader code and reach the callee's
2500 if (step_over_calls
< 0 && IN_SOLIB_DYNSYM_RESOLVE_CODE (stop_pc
))
2503 /* We can't update step_sp every time through the loop, because
2504 reading the stack pointer would slow down stepping too much.
2505 But we can update it every time we leave the step range. */
2506 ecs
->update_step_sp
= 1;
2508 /* Did we just take a signal? */
2509 if (IN_SIGTRAMP (stop_pc
, ecs
->stop_func_name
)
2510 && !IN_SIGTRAMP (prev_pc
, prev_func_name
)
2511 && INNER_THAN (read_sp (), step_sp
))
2513 /* We've just taken a signal; go until we are back to
2514 the point where we took it and one more. */
2516 /* Note: The test above succeeds not only when we stepped
2517 into a signal handler, but also when we step past the last
2518 statement of a signal handler and end up in the return stub
2519 of the signal handler trampoline. To distinguish between
2520 these two cases, check that the frame is INNER_THAN the
2521 previous one below. pai/1997-09-11 */
2525 CORE_ADDR current_frame
= FRAME_FP (get_current_frame ());
2527 if (INNER_THAN (current_frame
, step_frame_address
))
2529 /* We have just taken a signal; go until we are back to
2530 the point where we took it and one more. */
2532 /* This code is needed at least in the following case:
2533 The user types "next" and then a signal arrives (before
2534 the "next" is done). */
2536 /* Note that if we are stopped at a breakpoint, then we need
2537 the step_resume breakpoint to override any breakpoints at
2538 the same location, so that we will still step over the
2539 breakpoint even though the signal happened. */
2540 struct symtab_and_line sr_sal
;
2543 sr_sal
.symtab
= NULL
;
2545 sr_sal
.pc
= prev_pc
;
2546 /* We could probably be setting the frame to
2547 step_frame_address; I don't think anyone thought to
2549 check_for_old_step_resume_breakpoint ();
2550 step_resume_breakpoint
=
2551 set_momentary_breakpoint (sr_sal
, NULL
, bp_step_resume
);
2552 if (breakpoints_inserted
)
2553 insert_breakpoints ();
2557 /* We just stepped out of a signal handler and into
2558 its calling trampoline.
2560 Normally, we'd jump to step_over_function from
2561 here, but for some reason GDB can't unwind the
2562 stack correctly to find the real PC for the point
2563 user code where the signal trampoline will return
2564 -- FRAME_SAVED_PC fails, at least on HP-UX 10.20.
2565 But signal trampolines are pretty small stubs of
2566 code, anyway, so it's OK instead to just
2567 single-step out. Note: assuming such trampolines
2568 don't exhibit recursion on any platform... */
2569 find_pc_partial_function (stop_pc
, &ecs
->stop_func_name
,
2570 &ecs
->stop_func_start
,
2571 &ecs
->stop_func_end
);
2572 /* Readjust stepping range */
2573 step_range_start
= ecs
->stop_func_start
;
2574 step_range_end
= ecs
->stop_func_end
;
2575 ecs
->stepping_through_sigtramp
= 1;
2580 /* If this is stepi or nexti, make sure that the stepping range
2581 gets us past that instruction. */
2582 if (step_range_end
== 1)
2583 /* FIXME: Does this run afoul of the code below which, if
2584 we step into the middle of a line, resets the stepping
2586 step_range_end
= (step_range_start
= prev_pc
) + 1;
2588 ecs
->remove_breakpoints_on_following_step
= 1;
2592 if (stop_pc
== ecs
->stop_func_start
/* Quick test */
2593 || (in_prologue (stop_pc
, ecs
->stop_func_start
) &&
2594 !IN_SOLIB_RETURN_TRAMPOLINE (stop_pc
, ecs
->stop_func_name
))
2595 || IN_SOLIB_CALL_TRAMPOLINE (stop_pc
, ecs
->stop_func_name
)
2596 || ecs
->stop_func_name
== 0)
2598 /* It's a subroutine call. */
2600 if (step_over_calls
== 0)
2602 /* I presume that step_over_calls is only 0 when we're
2603 supposed to be stepping at the assembly language level
2604 ("stepi"). Just stop. */
2609 if (step_over_calls
> 0 || IGNORE_HELPER_CALL (stop_pc
))
2610 /* We're doing a "next". */
2611 goto step_over_function
;
2613 /* If we are in a function call trampoline (a stub between
2614 the calling routine and the real function), locate the real
2615 function. That's what tells us (a) whether we want to step
2616 into it at all, and (b) what prologue we want to run to
2617 the end of, if we do step into it. */
2618 tmp
= SKIP_TRAMPOLINE_CODE (stop_pc
);
2620 ecs
->stop_func_start
= tmp
;
2623 tmp
= DYNAMIC_TRAMPOLINE_NEXTPC (stop_pc
);
2626 struct symtab_and_line xxx
;
2627 /* Why isn't this s_a_l called "sr_sal", like all of the
2628 other s_a_l's where this code is duplicated? */
2629 INIT_SAL (&xxx
); /* initialize to zeroes */
2631 xxx
.section
= find_pc_overlay (xxx
.pc
);
2632 check_for_old_step_resume_breakpoint ();
2633 step_resume_breakpoint
=
2634 set_momentary_breakpoint (xxx
, NULL
, bp_step_resume
);
2635 insert_breakpoints ();
2640 /* If we have line number information for the function we
2641 are thinking of stepping into, step into it.
2643 If there are several symtabs at that PC (e.g. with include
2644 files), just want to know whether *any* of them have line
2645 numbers. find_pc_line handles this. */
2647 struct symtab_and_line tmp_sal
;
2649 tmp_sal
= find_pc_line (ecs
->stop_func_start
, 0);
2650 if (tmp_sal
.line
!= 0)
2651 goto step_into_function
;
2655 /* A subroutine call has happened. */
2657 /* We've just entered a callee, and we wish to resume until it
2658 returns to the caller. Setting a step_resume breakpoint on
2659 the return address will catch a return from the callee.
2661 However, if the callee is recursing, we want to be careful
2662 not to catch returns of those recursive calls, but only of
2663 THIS instance of the call.
2665 To do this, we set the step_resume bp's frame to our current
2666 caller's frame (step_frame_address, which is set by the "next"
2667 or "until" command, before execution begins). */
2668 struct symtab_and_line sr_sal
;
2670 INIT_SAL (&sr_sal
); /* initialize to zeros */
2672 ADDR_BITS_REMOVE (SAVED_PC_AFTER_CALL (get_current_frame ()));
2673 sr_sal
.section
= find_pc_overlay (sr_sal
.pc
);
2675 check_for_old_step_resume_breakpoint ();
2676 step_resume_breakpoint
=
2677 set_momentary_breakpoint (sr_sal
, get_current_frame (),
2680 if (!IN_SOLIB_DYNSYM_RESOLVE_CODE (sr_sal
.pc
))
2681 step_resume_breakpoint
->frame
= step_frame_address
;
2683 if (breakpoints_inserted
)
2684 insert_breakpoints ();
2689 /* Subroutine call with source code we should not step over.
2690 Do step to the first line of code in it. */
2694 s
= find_pc_symtab (stop_pc
);
2695 if (s
&& s
->language
!= language_asm
)
2696 ecs
->stop_func_start
= SKIP_PROLOGUE (ecs
->stop_func_start
);
2698 ecs
->sal
= find_pc_line (ecs
->stop_func_start
, 0);
2699 /* Use the step_resume_break to step until
2700 the end of the prologue, even if that involves jumps
2701 (as it seems to on the vax under 4.2). */
2702 /* If the prologue ends in the middle of a source line,
2703 continue to the end of that source line (if it is still
2704 within the function). Otherwise, just go to end of prologue. */
2705 #ifdef PROLOGUE_FIRSTLINE_OVERLAP
2706 /* no, don't either. It skips any code that's
2707 legitimately on the first line. */
2709 if (ecs
->sal
.end
&& ecs
->sal
.pc
!= ecs
->stop_func_start
&& ecs
->sal
.end
< ecs
->stop_func_end
)
2710 ecs
->stop_func_start
= ecs
->sal
.end
;
2713 if (ecs
->stop_func_start
== stop_pc
)
2715 /* We are already there: stop now. */
2720 /* Put the step-breakpoint there and go until there. */
2722 struct symtab_and_line sr_sal
;
2724 INIT_SAL (&sr_sal
); /* initialize to zeroes */
2725 sr_sal
.pc
= ecs
->stop_func_start
;
2726 sr_sal
.section
= find_pc_overlay (ecs
->stop_func_start
);
2727 /* Do not specify what the fp should be when we stop
2728 since on some machines the prologue
2729 is where the new fp value is established. */
2730 check_for_old_step_resume_breakpoint ();
2731 step_resume_breakpoint
=
2732 set_momentary_breakpoint (sr_sal
, NULL
, bp_step_resume
);
2733 if (breakpoints_inserted
)
2734 insert_breakpoints ();
2736 /* And make sure stepping stops right away then. */
2737 step_range_end
= step_range_start
;
2742 /* We've wandered out of the step range. */
2744 ecs
->sal
= find_pc_line (stop_pc
, 0);
2746 if (step_range_end
== 1)
2748 /* It is stepi or nexti. We always want to stop stepping after
2754 /* If we're in the return path from a shared library trampoline,
2755 we want to proceed through the trampoline when stepping. */
2756 if (IN_SOLIB_RETURN_TRAMPOLINE (stop_pc
, ecs
->stop_func_name
))
2760 /* Determine where this trampoline returns. */
2761 tmp
= SKIP_TRAMPOLINE_CODE (stop_pc
);
2763 /* Only proceed through if we know where it's going. */
2766 /* And put the step-breakpoint there and go until there. */
2767 struct symtab_and_line sr_sal
;
2769 INIT_SAL (&sr_sal
); /* initialize to zeroes */
2771 sr_sal
.section
= find_pc_overlay (sr_sal
.pc
);
2772 /* Do not specify what the fp should be when we stop
2773 since on some machines the prologue
2774 is where the new fp value is established. */
2775 check_for_old_step_resume_breakpoint ();
2776 step_resume_breakpoint
=
2777 set_momentary_breakpoint (sr_sal
, NULL
, bp_step_resume
);
2778 if (breakpoints_inserted
)
2779 insert_breakpoints ();
2781 /* Restart without fiddling with the step ranges or
2787 if (ecs
->sal
.line
== 0)
2789 /* We have no line number information. That means to stop
2790 stepping (does this always happen right after one instruction,
2791 when we do "s" in a function with no line numbers,
2792 or can this happen as a result of a return or longjmp?). */
2797 if ((stop_pc
== ecs
->sal
.pc
)
2798 && (ecs
->current_line
!= ecs
->sal
.line
|| ecs
->current_symtab
!= ecs
->sal
.symtab
))
2800 /* We are at the start of a different line. So stop. Note that
2801 we don't stop if we step into the middle of a different line.
2802 That is said to make things like for (;;) statements work
2808 /* We aren't done stepping.
2810 Optimize by setting the stepping range to the line.
2811 (We might not be in the original line, but if we entered a
2812 new line in mid-statement, we continue stepping. This makes
2813 things like for(;;) statements work better.) */
2815 if (ecs
->stop_func_end
&& ecs
->sal
.end
>= ecs
->stop_func_end
)
2817 /* If this is the last line of the function, don't keep stepping
2818 (it would probably step us out of the function).
2819 This is particularly necessary for a one-line function,
2820 in which after skipping the prologue we better stop even though
2821 we will be in mid-line. */
2825 step_range_start
= ecs
->sal
.pc
;
2826 step_range_end
= ecs
->sal
.end
;
2827 step_frame_address
= FRAME_FP (get_current_frame ());
2828 ecs
->current_line
= ecs
->sal
.line
;
2829 ecs
->current_symtab
= ecs
->sal
.symtab
;
2831 /* In the case where we just stepped out of a function into the middle
2832 of a line of the caller, continue stepping, but step_frame_address
2833 must be modified to current frame */
2835 CORE_ADDR current_frame
= FRAME_FP (get_current_frame ());
2836 if (!(INNER_THAN (current_frame
, step_frame_address
)))
2837 step_frame_address
= current_frame
;
2845 && IN_SIGTRAMP (stop_pc
, ecs
->stop_func_name
)
2846 && !IN_SIGTRAMP (prev_pc
, prev_func_name
)
2847 && INNER_THAN (read_sp (), step_sp
))
2849 /* What has happened here is that we have just stepped the inferior
2850 with a signal (because it is a signal which shouldn't make
2851 us stop), thus stepping into sigtramp.
2853 So we need to set a step_resume_break_address breakpoint
2854 and continue until we hit it, and then step. FIXME: This should
2855 be more enduring than a step_resume breakpoint; we should know
2856 that we will later need to keep going rather than re-hitting
2857 the breakpoint here (see testsuite/gdb.t06/signals.exp where
2858 it says "exceedingly difficult"). */
2859 struct symtab_and_line sr_sal
;
2861 INIT_SAL (&sr_sal
); /* initialize to zeroes */
2862 sr_sal
.pc
= prev_pc
;
2863 sr_sal
.section
= find_pc_overlay (sr_sal
.pc
);
2864 /* We perhaps could set the frame if we kept track of what
2865 the frame corresponding to prev_pc was. But we don't,
2867 through_sigtramp_breakpoint
=
2868 set_momentary_breakpoint (sr_sal
, NULL
, bp_through_sigtramp
);
2869 if (breakpoints_inserted
)
2870 insert_breakpoints ();
2872 ecs
->remove_breakpoints_on_following_step
= 1;
2873 ecs
->another_trap
= 1;
2877 /* Come to this label when you need to resume the inferior.
2878 It's really much cleaner to do a goto than a maze of if-else
2881 /* ??rehrauer: ttrace on HP-UX theoretically allows one to debug
2882 a vforked child beetween its creation and subsequent exit or
2883 call to exec(). However, I had big problems in this rather
2884 creaky exec engine, getting that to work. The fundamental
2885 problem is that I'm trying to debug two processes via an
2886 engine that only understands a single process with possibly
2889 Hence, this spot is known to have problems when
2890 target_can_follow_vfork_prior_to_exec returns 1. */
2892 /* Save the pc before execution, to compare with pc after stop. */
2893 prev_pc
= read_pc (); /* Might have been DECR_AFTER_BREAK */
2894 prev_func_start
= ecs
->stop_func_start
; /* Ok, since if DECR_PC_AFTER
2895 BREAK is defined, the
2896 original pc would not have
2897 been at the start of a
2899 prev_func_name
= ecs
->stop_func_name
;
2901 if (ecs
->update_step_sp
)
2902 step_sp
= read_sp ();
2903 ecs
->update_step_sp
= 0;
2905 /* If we did not do break;, it means we should keep
2906 running the inferior and not return to debugger. */
2908 if (trap_expected
&& stop_signal
!= TARGET_SIGNAL_TRAP
)
2910 /* We took a signal (which we are supposed to pass through to
2911 the inferior, else we'd have done a break above) and we
2912 haven't yet gotten our trap. Simply continue. */
2913 resume (currently_stepping (ecs
), stop_signal
);
2917 /* Either the trap was not expected, but we are continuing
2918 anyway (the user asked that this signal be passed to the
2921 The signal was SIGTRAP, e.g. it was our signal, but we
2922 decided we should resume from it.
2924 We're going to run this baby now!
2926 Insert breakpoints now, unless we are trying
2927 to one-proceed past a breakpoint. */
2928 /* If we've just finished a special step resume and we don't
2929 want to hit a breakpoint, pull em out. */
2930 if (step_resume_breakpoint
== NULL
2931 && through_sigtramp_breakpoint
== NULL
2932 && ecs
->remove_breakpoints_on_following_step
)
2934 ecs
->remove_breakpoints_on_following_step
= 0;
2935 remove_breakpoints ();
2936 breakpoints_inserted
= 0;
2938 else if (!breakpoints_inserted
&&
2939 (through_sigtramp_breakpoint
!= NULL
|| !ecs
->another_trap
))
2941 breakpoints_failed
= insert_breakpoints ();
2942 if (breakpoints_failed
)
2944 breakpoints_inserted
= 1;
2947 trap_expected
= ecs
->another_trap
;
2949 /* Do not deliver SIGNAL_TRAP (except when the user
2950 explicitly specifies that such a signal should be
2951 delivered to the target program).
2953 Typically, this would occure when a user is debugging a
2954 target monitor on a simulator: the target monitor sets a
2955 breakpoint; the simulator encounters this break-point and
2956 halts the simulation handing control to GDB; GDB, noteing
2957 that the break-point isn't valid, returns control back to
2958 the simulator; the simulator then delivers the hardware
2959 equivalent of a SIGNAL_TRAP to the program being
2962 if (stop_signal
== TARGET_SIGNAL_TRAP
2963 && !signal_program
[stop_signal
])
2964 stop_signal
= TARGET_SIGNAL_0
;
2966 #ifdef SHIFT_INST_REGS
2967 /* I'm not sure when this following segment applies. I do know,
2968 now, that we shouldn't rewrite the regs when we were stopped
2969 by a random signal from the inferior process. */
2970 /* FIXME: Shouldn't this be based on the valid bit of the SXIP?
2971 (this is only used on the 88k). */
2973 if (!bpstat_explains_signal (stop_bpstat
)
2974 && (stop_signal
!= TARGET_SIGNAL_CHLD
)
2975 && !stopped_by_random_signal
)
2977 #endif /* SHIFT_INST_REGS */
2979 resume (currently_stepping (ecs
), stop_signal
);
2982 /* Former continues in the main loop goto here. */
2984 /* This used to be at the top of the loop. */
2985 if (ecs
->infwait_state
== infwait_normal_state
)
2987 overlay_cache_invalid
= 1;
2989 /* We have to invalidate the registers BEFORE calling
2990 target_wait because they can be loaded from the target
2991 while in target_wait. This makes remote debugging a bit
2992 more efficient for those targets that provide critical
2993 registers as part of their normal status mechanism. */
2995 registers_changed ();
2996 ecs
->waiton_pid
= -1;
2997 ecs
->wp
= &(ecs
->ws
);
2999 /* This is the old end of the while loop. Let everybody know
3000 we want to wait for the inferior some more and get called
3002 ecs
->wait_some_more
= 1;
3006 /* Former breaks in the main loop goto here. */
3010 if (target_has_execution
)
3012 /* Are we stopping for a vfork event? We only stop when we see
3013 the child's event. However, we may not yet have seen the
3014 parent's event. And, inferior_pid is still set to the parent's
3015 pid, until we resume again and follow either the parent or child.
3017 To ensure that we can really touch inferior_pid (aka, the
3018 parent process) -- which calls to functions like read_pc
3019 implicitly do -- wait on the parent if necessary. */
3020 if ((pending_follow
.kind
== TARGET_WAITKIND_VFORKED
)
3021 && !pending_follow
.fork_event
.saw_parent_fork
)
3027 if (target_wait_hook
)
3028 parent_pid
= target_wait_hook (-1, &(ecs
->ws
));
3030 parent_pid
= target_wait (-1, &(ecs
->ws
));
3032 while (parent_pid
!= inferior_pid
);
3035 /* Assuming the inferior still exists, set these up for next
3036 time, just like we did above if we didn't break out of the
3038 prev_pc
= read_pc ();
3039 prev_func_start
= ecs
->stop_func_start
;
3040 prev_func_name
= ecs
->stop_func_name
;
3042 /* Let callers know we don't want to wait for the inferior anymore. */
3043 ecs
->wait_some_more
= 0;
3046 /* Are we in the middle of stepping? */
3049 currently_stepping (ecs
)
3050 struct execution_control_state
*ecs
;
3052 return ((through_sigtramp_breakpoint
== NULL
3053 && !ecs
->handling_longjmp
3054 && ((step_range_end
&& step_resume_breakpoint
== NULL
)
3056 || ecs
->stepping_through_solib_after_catch
3057 || bpstat_should_step ());
3060 /* This function returns TRUE if ep is an internal breakpoint
3061 set to catch generic shared library (aka dynamically-linked
3062 library) events. (This is *NOT* the same as a catchpoint for a
3063 shlib event. The latter is something a user can set; this is
3064 something gdb sets for its own use, and isn't ever shown to a
3067 is_internal_shlib_eventpoint (ep
)
3068 struct breakpoint
*ep
;
3071 (ep
->type
== bp_shlib_event
)
3075 /* This function returns TRUE if bs indicates that the inferior
3076 stopped due to a shared library (aka dynamically-linked library)
3079 stopped_for_internal_shlib_event (bs
)
3082 /* Note that multiple eventpoints may've caused the stop. Any
3083 that are associated with shlib events will be accepted. */
3084 for (; bs
!= NULL
; bs
= bs
->next
)
3086 if ((bs
->breakpoint_at
!= NULL
)
3087 && is_internal_shlib_eventpoint (bs
->breakpoint_at
))
3091 /* If we get here, then no candidate was found. */
3095 /* This function returns TRUE if bs indicates that the inferior
3096 stopped due to a shared library (aka dynamically-linked library)
3097 event caught by a catchpoint.
3099 If TRUE, cp_p is set to point to the catchpoint.
3101 Else, the value of cp_p is undefined. */
3103 stopped_for_shlib_catchpoint (bs
, cp_p
)
3105 struct breakpoint
**cp_p
;
3107 /* Note that multiple eventpoints may've caused the stop. Any
3108 that are associated with shlib events will be accepted. */
3111 for (; bs
!= NULL
; bs
= bs
->next
)
3113 if ((bs
->breakpoint_at
!= NULL
)
3114 && ep_is_shlib_catchpoint (bs
->breakpoint_at
))
3116 *cp_p
= bs
->breakpoint_at
;
3121 /* If we get here, then no candidate was found. */
3126 /* Reset proper settings after an asynchronous command has finished.
3127 If the execution command was in synchronous mode, register stdin
3128 with the event loop, and reset the prompt. */
3130 complete_execution ()
3132 extern cleanup_sigint_signal_handler
PARAMS ((void));
3134 target_executing
= 0;
3137 add_file_handler (input_fd
, (file_handler_func
*) call_readline
, 0);
3140 cleanup_sigint_signal_handler ();
3141 display_gdb_prompt (0);
3145 /* Here to return control to GDB when the inferior stops for real.
3146 Print appropriate messages, remove breakpoints, give terminal our modes.
3148 STOP_PRINT_FRAME nonzero means print the executing frame
3149 (pc, function, args, file, line number and line text).
3150 BREAKPOINTS_FAILED nonzero means stop was due to error
3151 attempting to insert breakpoints. */
3156 /* As with the notification of thread events, we want to delay
3157 notifying the user that we've switched thread context until
3158 the inferior actually stops.
3160 (Note that there's no point in saying anything if the inferior
3162 if (may_switch_from_inferior_pid
3163 && (switched_from_inferior_pid
!= inferior_pid
)
3164 && target_has_execution
)
3166 target_terminal_ours_for_output ();
3167 printf_filtered ("[Switched to %s]\n",
3168 target_pid_or_tid_to_str (inferior_pid
));
3169 switched_from_inferior_pid
= inferior_pid
;
3172 /* Make sure that the current_frame's pc is correct. This
3173 is a correction for setting up the frame info before doing
3174 DECR_PC_AFTER_BREAK */
3175 if (target_has_execution
&& get_current_frame ())
3176 (get_current_frame ())->pc
= read_pc ();
3178 if (breakpoints_failed
)
3180 target_terminal_ours_for_output ();
3181 print_sys_errmsg ("ptrace", breakpoints_failed
);
3182 printf_filtered ("Stopped; cannot insert breakpoints.\n\
3183 The same program may be running in another process.\n");
3186 if (target_has_execution
&& breakpoints_inserted
)
3188 if (remove_breakpoints ())
3190 target_terminal_ours_for_output ();
3191 printf_filtered ("Cannot remove breakpoints because ");
3192 printf_filtered ("program is no longer writable.\n");
3193 printf_filtered ("It might be running in another process.\n");
3194 printf_filtered ("Further execution is probably impossible.\n");
3197 breakpoints_inserted
= 0;
3199 /* Delete the breakpoint we stopped at, if it wants to be deleted.
3200 Delete any breakpoint that is to be deleted at the next stop. */
3202 breakpoint_auto_delete (stop_bpstat
);
3204 /* If an auto-display called a function and that got a signal,
3205 delete that auto-display to avoid an infinite recursion. */
3207 if (stopped_by_random_signal
)
3208 disable_current_display ();
3210 /* Don't print a message if in the middle of doing a "step n"
3211 operation for n > 1 */
3212 if (step_multi
&& stop_step
)
3215 target_terminal_ours ();
3217 /* Did we stop because the user set the stop_on_solib_events
3218 variable? (If so, we report this as a generic, "Stopped due
3219 to shlib event" message.) */
3220 if (stopped_for_internal_shlib_event (stop_bpstat
))
3222 printf_filtered ("Stopped due to shared library event\n");
3225 /* Look up the hook_stop and run it if it exists. */
3227 if (stop_command
&& stop_command
->hook
)
3229 catch_errors (hook_stop_stub
, stop_command
->hook
,
3230 "Error while running hook_stop:\n", RETURN_MASK_ALL
);
3233 if (!target_has_stack
)
3239 /* Select innermost stack frame - i.e., current frame is frame 0,
3240 and current location is based on that.
3241 Don't do this on return from a stack dummy routine,
3242 or if the program has exited. */
3244 if (!stop_stack_dummy
)
3246 select_frame (get_current_frame (), 0);
3248 /* Print current location without a level number, if
3249 we have changed functions or hit a breakpoint.
3250 Print source line if we have one.
3251 bpstat_print() contains the logic deciding in detail
3252 what to print, based on the event(s) that just occurred. */
3254 if (stop_print_frame
)
3259 bpstat_ret
= bpstat_print (stop_bpstat
);
3260 /* bpstat_print() returned one of:
3261 -1: Didn't print anything
3262 0: Printed preliminary "Breakpoint n, " message, desires
3264 1: Printed something, don't tack on location */
3266 if (bpstat_ret
== -1)
3268 && step_frame_address
== FRAME_FP (get_current_frame ())
3269 && step_start_function
== find_pc_function (stop_pc
))
3270 source_flag
= -1; /* finished step, just print source line */
3272 source_flag
= 1; /* print location and source line */
3273 else if (bpstat_ret
== 0) /* hit bpt, desire location */
3274 source_flag
= 1; /* print location and source line */
3275 else /* bpstat_ret == 1, hit bpt, do not desire location */
3276 source_flag
= -1; /* just print source line */
3278 /* The behavior of this routine with respect to the source
3280 -1: Print only source line
3281 0: Print only location
3282 1: Print location and source line */
3283 show_and_print_stack_frame (selected_frame
, -1, source_flag
);
3285 /* Display the auto-display expressions. */
3290 /* Save the function value return registers, if we care.
3291 We might be about to restore their previous contents. */
3292 if (proceed_to_finish
)
3293 read_register_bytes (0, stop_registers
, REGISTER_BYTES
);
3295 if (stop_stack_dummy
)
3297 /* Pop the empty frame that contains the stack dummy.
3298 POP_FRAME ends with a setting of the current frame, so we
3299 can use that next. */
3301 /* Set stop_pc to what it was before we called the function.
3302 Can't rely on restore_inferior_status because that only gets
3303 called if we don't stop in the called function. */
3304 stop_pc
= read_pc ();
3305 select_frame (get_current_frame (), 0);
3309 TUIDO (((TuiOpaqueFuncPtr
) tui_vCheckDataValues
, selected_frame
));
3312 annotate_stopped ();
3316 hook_stop_stub (cmd
)
3319 execute_user_command ((struct cmd_list_element
*) cmd
, 0);
3324 signal_stop_state (signo
)
3327 return signal_stop
[signo
];
3331 signal_print_state (signo
)
3334 return signal_print
[signo
];
3338 signal_pass_state (signo
)
3341 return signal_program
[signo
];
3348 Signal Stop\tPrint\tPass to program\tDescription\n");
3352 sig_print_info (oursig
)
3353 enum target_signal oursig
;
3355 char *name
= target_signal_to_name (oursig
);
3356 int name_padding
= 13 - strlen (name
);
3357 if (name_padding
<= 0)
3360 printf_filtered ("%s", name
);
3361 printf_filtered ("%*.*s ", name_padding
, name_padding
,
3363 printf_filtered ("%s\t", signal_stop
[oursig
] ? "Yes" : "No");
3364 printf_filtered ("%s\t", signal_print
[oursig
] ? "Yes" : "No");
3365 printf_filtered ("%s\t\t", signal_program
[oursig
] ? "Yes" : "No");
3366 printf_filtered ("%s\n", target_signal_to_string (oursig
));
3369 /* Specify how various signals in the inferior should be handled. */
3372 handle_command (args
, from_tty
)
3377 int digits
, wordlen
;
3378 int sigfirst
, signum
, siglast
;
3379 enum target_signal oursig
;
3382 unsigned char *sigs
;
3383 struct cleanup
*old_chain
;
3387 error_no_arg ("signal to handle");
3390 /* Allocate and zero an array of flags for which signals to handle. */
3392 nsigs
= (int) TARGET_SIGNAL_LAST
;
3393 sigs
= (unsigned char *) alloca (nsigs
);
3394 memset (sigs
, 0, nsigs
);
3396 /* Break the command line up into args. */
3398 argv
= buildargv (args
);
3403 old_chain
= make_cleanup_freeargv (argv
);
3405 /* Walk through the args, looking for signal oursigs, signal names, and
3406 actions. Signal numbers and signal names may be interspersed with
3407 actions, with the actions being performed for all signals cumulatively
3408 specified. Signal ranges can be specified as <LOW>-<HIGH>. */
3410 while (*argv
!= NULL
)
3412 wordlen
= strlen (*argv
);
3413 for (digits
= 0; isdigit ((*argv
)[digits
]); digits
++)
3417 sigfirst
= siglast
= -1;
3419 if (wordlen
>= 1 && !strncmp (*argv
, "all", wordlen
))
3421 /* Apply action to all signals except those used by the
3422 debugger. Silently skip those. */
3425 siglast
= nsigs
- 1;
3427 else if (wordlen
>= 1 && !strncmp (*argv
, "stop", wordlen
))
3429 SET_SIGS (nsigs
, sigs
, signal_stop
);
3430 SET_SIGS (nsigs
, sigs
, signal_print
);
3432 else if (wordlen
>= 1 && !strncmp (*argv
, "ignore", wordlen
))
3434 UNSET_SIGS (nsigs
, sigs
, signal_program
);
3436 else if (wordlen
>= 2 && !strncmp (*argv
, "print", wordlen
))
3438 SET_SIGS (nsigs
, sigs
, signal_print
);
3440 else if (wordlen
>= 2 && !strncmp (*argv
, "pass", wordlen
))
3442 SET_SIGS (nsigs
, sigs
, signal_program
);
3444 else if (wordlen
>= 3 && !strncmp (*argv
, "nostop", wordlen
))
3446 UNSET_SIGS (nsigs
, sigs
, signal_stop
);
3448 else if (wordlen
>= 3 && !strncmp (*argv
, "noignore", wordlen
))
3450 SET_SIGS (nsigs
, sigs
, signal_program
);
3452 else if (wordlen
>= 4 && !strncmp (*argv
, "noprint", wordlen
))
3454 UNSET_SIGS (nsigs
, sigs
, signal_print
);
3455 UNSET_SIGS (nsigs
, sigs
, signal_stop
);
3457 else if (wordlen
>= 4 && !strncmp (*argv
, "nopass", wordlen
))
3459 UNSET_SIGS (nsigs
, sigs
, signal_program
);
3461 else if (digits
> 0)
3463 /* It is numeric. The numeric signal refers to our own
3464 internal signal numbering from target.h, not to host/target
3465 signal number. This is a feature; users really should be
3466 using symbolic names anyway, and the common ones like
3467 SIGHUP, SIGINT, SIGALRM, etc. will work right anyway. */
3469 sigfirst
= siglast
= (int)
3470 target_signal_from_command (atoi (*argv
));
3471 if ((*argv
)[digits
] == '-')
3474 target_signal_from_command (atoi ((*argv
) + digits
+ 1));
3476 if (sigfirst
> siglast
)
3478 /* Bet he didn't figure we'd think of this case... */
3486 oursig
= target_signal_from_name (*argv
);
3487 if (oursig
!= TARGET_SIGNAL_UNKNOWN
)
3489 sigfirst
= siglast
= (int) oursig
;
3493 /* Not a number and not a recognized flag word => complain. */
3494 error ("Unrecognized or ambiguous flag word: \"%s\".", *argv
);
3498 /* If any signal numbers or symbol names were found, set flags for
3499 which signals to apply actions to. */
3501 for (signum
= sigfirst
; signum
>= 0 && signum
<= siglast
; signum
++)
3503 switch ((enum target_signal
) signum
)
3505 case TARGET_SIGNAL_TRAP
:
3506 case TARGET_SIGNAL_INT
:
3507 if (!allsigs
&& !sigs
[signum
])
3509 if (query ("%s is used by the debugger.\n\
3510 Are you sure you want to change it? ",
3511 target_signal_to_name
3512 ((enum target_signal
) signum
)))
3518 printf_unfiltered ("Not confirmed, unchanged.\n");
3519 gdb_flush (gdb_stdout
);
3523 case TARGET_SIGNAL_0
:
3524 case TARGET_SIGNAL_DEFAULT
:
3525 case TARGET_SIGNAL_UNKNOWN
:
3526 /* Make sure that "all" doesn't print these. */
3537 target_notice_signals (inferior_pid
);
3541 /* Show the results. */
3542 sig_print_header ();
3543 for (signum
= 0; signum
< nsigs
; signum
++)
3547 sig_print_info (signum
);
3552 do_cleanups (old_chain
);
3556 xdb_handle_command (args
, from_tty
)
3561 struct cleanup
*old_chain
;
3563 /* Break the command line up into args. */
3565 argv
= buildargv (args
);
3570 old_chain
= make_cleanup_freeargv (argv
);
3571 if (argv
[1] != (char *) NULL
)
3576 bufLen
= strlen (argv
[0]) + 20;
3577 argBuf
= (char *) xmalloc (bufLen
);
3581 enum target_signal oursig
;
3583 oursig
= target_signal_from_name (argv
[0]);
3584 memset (argBuf
, 0, bufLen
);
3585 if (strcmp (argv
[1], "Q") == 0)
3586 sprintf (argBuf
, "%s %s", argv
[0], "noprint");
3589 if (strcmp (argv
[1], "s") == 0)
3591 if (!signal_stop
[oursig
])
3592 sprintf (argBuf
, "%s %s", argv
[0], "stop");
3594 sprintf (argBuf
, "%s %s", argv
[0], "nostop");
3596 else if (strcmp (argv
[1], "i") == 0)
3598 if (!signal_program
[oursig
])
3599 sprintf (argBuf
, "%s %s", argv
[0], "pass");
3601 sprintf (argBuf
, "%s %s", argv
[0], "nopass");
3603 else if (strcmp (argv
[1], "r") == 0)
3605 if (!signal_print
[oursig
])
3606 sprintf (argBuf
, "%s %s", argv
[0], "print");
3608 sprintf (argBuf
, "%s %s", argv
[0], "noprint");
3614 handle_command (argBuf
, from_tty
);
3616 printf_filtered ("Invalid signal handling flag.\n");
3621 do_cleanups (old_chain
);
3624 /* Print current contents of the tables set by the handle command.
3625 It is possible we should just be printing signals actually used
3626 by the current target (but for things to work right when switching
3627 targets, all signals should be in the signal tables). */
3630 signals_info (signum_exp
, from_tty
)
3634 enum target_signal oursig
;
3635 sig_print_header ();
3639 /* First see if this is a symbol name. */
3640 oursig
= target_signal_from_name (signum_exp
);
3641 if (oursig
== TARGET_SIGNAL_UNKNOWN
)
3643 /* No, try numeric. */
3645 target_signal_from_command (parse_and_eval_address (signum_exp
));
3647 sig_print_info (oursig
);
3651 printf_filtered ("\n");
3652 /* These ugly casts brought to you by the native VAX compiler. */
3653 for (oursig
= TARGET_SIGNAL_FIRST
;
3654 (int) oursig
< (int) TARGET_SIGNAL_LAST
;
3655 oursig
= (enum target_signal
) ((int) oursig
+ 1))
3659 if (oursig
!= TARGET_SIGNAL_UNKNOWN
3660 && oursig
!= TARGET_SIGNAL_DEFAULT
3661 && oursig
!= TARGET_SIGNAL_0
)
3662 sig_print_info (oursig
);
3665 printf_filtered ("\nUse the \"handle\" command to change these tables.\n");
3668 struct inferior_status
3670 enum target_signal stop_signal
;
3674 int stop_stack_dummy
;
3675 int stopped_by_random_signal
;
3677 CORE_ADDR step_range_start
;
3678 CORE_ADDR step_range_end
;
3679 CORE_ADDR step_frame_address
;
3680 int step_over_calls
;
3681 CORE_ADDR step_resume_break_address
;
3682 int stop_after_trap
;
3683 int stop_soon_quietly
;
3684 CORE_ADDR selected_frame_address
;
3685 char *stop_registers
;
3687 /* These are here because if call_function_by_hand has written some
3688 registers and then decides to call error(), we better not have changed
3693 int breakpoint_proceeded
;
3694 int restore_stack_info
;
3695 int proceed_to_finish
;
3699 static struct inferior_status
*xmalloc_inferior_status
PARAMS ((void));
3700 static struct inferior_status
*
3701 xmalloc_inferior_status ()
3703 struct inferior_status
*inf_status
;
3704 inf_status
= xmalloc (sizeof (struct inferior_status
));
3705 inf_status
->stop_registers
= xmalloc (REGISTER_BYTES
);
3706 inf_status
->registers
= xmalloc (REGISTER_BYTES
);
3710 static void free_inferior_status
PARAMS ((struct inferior_status
*));
3712 free_inferior_status (inf_status
)
3713 struct inferior_status
*inf_status
;
3715 free (inf_status
->registers
);
3716 free (inf_status
->stop_registers
);
3721 write_inferior_status_register (inf_status
, regno
, val
)
3722 struct inferior_status
*inf_status
;
3726 int size
= REGISTER_RAW_SIZE (regno
);
3727 void *buf
= alloca (size
);
3728 store_signed_integer (buf
, size
, val
);
3729 memcpy (&inf_status
->registers
[REGISTER_BYTE (regno
)], buf
, size
);
3734 /* Save all of the information associated with the inferior<==>gdb
3735 connection. INF_STATUS is a pointer to a "struct inferior_status"
3736 (defined in inferior.h). */
3738 struct inferior_status
*
3739 save_inferior_status (restore_stack_info
)
3740 int restore_stack_info
;
3742 struct inferior_status
*inf_status
= xmalloc_inferior_status ();
3744 inf_status
->stop_signal
= stop_signal
;
3745 inf_status
->stop_pc
= stop_pc
;
3746 inf_status
->stop_step
= stop_step
;
3747 inf_status
->stop_stack_dummy
= stop_stack_dummy
;
3748 inf_status
->stopped_by_random_signal
= stopped_by_random_signal
;
3749 inf_status
->trap_expected
= trap_expected
;
3750 inf_status
->step_range_start
= step_range_start
;
3751 inf_status
->step_range_end
= step_range_end
;
3752 inf_status
->step_frame_address
= step_frame_address
;
3753 inf_status
->step_over_calls
= step_over_calls
;
3754 inf_status
->stop_after_trap
= stop_after_trap
;
3755 inf_status
->stop_soon_quietly
= stop_soon_quietly
;
3756 /* Save original bpstat chain here; replace it with copy of chain.
3757 If caller's caller is walking the chain, they'll be happier if we
3758 hand them back the original chain when restore_inferior_status is
3760 inf_status
->stop_bpstat
= stop_bpstat
;
3761 stop_bpstat
= bpstat_copy (stop_bpstat
);
3762 inf_status
->breakpoint_proceeded
= breakpoint_proceeded
;
3763 inf_status
->restore_stack_info
= restore_stack_info
;
3764 inf_status
->proceed_to_finish
= proceed_to_finish
;
3766 memcpy (inf_status
->stop_registers
, stop_registers
, REGISTER_BYTES
);
3768 read_register_bytes (0, inf_status
->registers
, REGISTER_BYTES
);
3770 record_selected_frame (&(inf_status
->selected_frame_address
),
3771 &(inf_status
->selected_level
));
3775 struct restore_selected_frame_args
3777 CORE_ADDR frame_address
;
3781 static int restore_selected_frame
PARAMS ((PTR
));
3784 restore_selected_frame (args
)
3787 struct restore_selected_frame_args
*fr
=
3788 (struct restore_selected_frame_args
*) args
;
3789 struct frame_info
*frame
;
3790 int level
= fr
->level
;
3792 frame
= find_relative_frame (get_current_frame (), &level
);
3794 /* If inf_status->selected_frame_address is NULL, there was no
3795 previously selected frame. */
3796 if (frame
== NULL
||
3797 /* FRAME_FP (frame) != fr->frame_address || */
3798 /* elz: deleted this check as a quick fix to the problem that
3799 for function called by hand gdb creates no internal frame
3800 structure and the real stack and gdb's idea of stack are
3801 different if nested calls by hands are made.
3803 mvs: this worries me. */
3806 warning ("Unable to restore previously selected frame.\n");
3810 select_frame (frame
, fr
->level
);
3816 restore_inferior_status (inf_status
)
3817 struct inferior_status
*inf_status
;
3819 stop_signal
= inf_status
->stop_signal
;
3820 stop_pc
= inf_status
->stop_pc
;
3821 stop_step
= inf_status
->stop_step
;
3822 stop_stack_dummy
= inf_status
->stop_stack_dummy
;
3823 stopped_by_random_signal
= inf_status
->stopped_by_random_signal
;
3824 trap_expected
= inf_status
->trap_expected
;
3825 step_range_start
= inf_status
->step_range_start
;
3826 step_range_end
= inf_status
->step_range_end
;
3827 step_frame_address
= inf_status
->step_frame_address
;
3828 step_over_calls
= inf_status
->step_over_calls
;
3829 stop_after_trap
= inf_status
->stop_after_trap
;
3830 stop_soon_quietly
= inf_status
->stop_soon_quietly
;
3831 bpstat_clear (&stop_bpstat
);
3832 stop_bpstat
= inf_status
->stop_bpstat
;
3833 breakpoint_proceeded
= inf_status
->breakpoint_proceeded
;
3834 proceed_to_finish
= inf_status
->proceed_to_finish
;
3836 /* FIXME: Is the restore of stop_registers always needed */
3837 memcpy (stop_registers
, inf_status
->stop_registers
, REGISTER_BYTES
);
3839 /* The inferior can be gone if the user types "print exit(0)"
3840 (and perhaps other times). */
3841 if (target_has_execution
)
3842 write_register_bytes (0, inf_status
->registers
, REGISTER_BYTES
);
3844 /* FIXME: If we are being called after stopping in a function which
3845 is called from gdb, we should not be trying to restore the
3846 selected frame; it just prints a spurious error message (The
3847 message is useful, however, in detecting bugs in gdb (like if gdb
3848 clobbers the stack)). In fact, should we be restoring the
3849 inferior status at all in that case? . */
3851 if (target_has_stack
&& inf_status
->restore_stack_info
)
3853 struct restore_selected_frame_args fr
;
3854 fr
.level
= inf_status
->selected_level
;
3855 fr
.frame_address
= inf_status
->selected_frame_address
;
3856 /* The point of catch_errors is that if the stack is clobbered,
3857 walking the stack might encounter a garbage pointer and error()
3858 trying to dereference it. */
3859 if (catch_errors (restore_selected_frame
, &fr
,
3860 "Unable to restore previously selected frame:\n",
3861 RETURN_MASK_ERROR
) == 0)
3862 /* Error in restoring the selected frame. Select the innermost
3866 select_frame (get_current_frame (), 0);
3870 free_inferior_status (inf_status
);
3874 discard_inferior_status (inf_status
)
3875 struct inferior_status
*inf_status
;
3877 /* See save_inferior_status for info on stop_bpstat. */
3878 bpstat_clear (&inf_status
->stop_bpstat
);
3879 free_inferior_status (inf_status
);
3883 set_follow_fork_mode_command (arg
, from_tty
, c
)
3886 struct cmd_list_element
*c
;
3888 if (!STREQ (arg
, "parent") &&
3889 !STREQ (arg
, "child") &&
3890 !STREQ (arg
, "both") &&
3891 !STREQ (arg
, "ask"))
3892 error ("follow-fork-mode must be one of \"parent\", \"child\", \"both\" or \"ask\".");
3894 if (follow_fork_mode_string
!= NULL
)
3895 free (follow_fork_mode_string
);
3896 follow_fork_mode_string
= savestring (arg
, strlen (arg
));
3901 static void build_infrun
PARAMS ((void));
3905 stop_registers
= xmalloc (REGISTER_BYTES
);
3910 _initialize_infrun ()
3913 register int numsigs
;
3914 struct cmd_list_element
*c
;
3918 register_gdbarch_swap (&stop_registers
, sizeof (stop_registers
), NULL
);
3919 register_gdbarch_swap (NULL
, 0, build_infrun
);
3921 add_info ("signals", signals_info
,
3922 "What debugger does when program gets various signals.\n\
3923 Specify a signal as argument to print info on that signal only.");
3924 add_info_alias ("handle", "signals", 0);
3926 add_com ("handle", class_run
, handle_command
,
3927 concat ("Specify how to handle a signal.\n\
3928 Args are signals and actions to apply to those signals.\n\
3929 Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\
3930 from 1-15 are allowed for compatibility with old versions of GDB.\n\
3931 Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\
3932 The special arg \"all\" is recognized to mean all signals except those\n\
3933 used by the debugger, typically SIGTRAP and SIGINT.\n",
3934 "Recognized actions include \"stop\", \"nostop\", \"print\", \"noprint\",\n\
3935 \"pass\", \"nopass\", \"ignore\", or \"noignore\".\n\
3936 Stop means reenter debugger if this signal happens (implies print).\n\
3937 Print means print a message if this signal happens.\n\
3938 Pass means let program see this signal; otherwise program doesn't know.\n\
3939 Ignore is a synonym for nopass and noignore is a synonym for pass.\n\
3940 Pass and Stop may be combined.", NULL
));
3943 add_com ("lz", class_info
, signals_info
,
3944 "What debugger does when program gets various signals.\n\
3945 Specify a signal as argument to print info on that signal only.");
3946 add_com ("z", class_run
, xdb_handle_command
,
3947 concat ("Specify how to handle a signal.\n\
3948 Args are signals and actions to apply to those signals.\n\
3949 Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\
3950 from 1-15 are allowed for compatibility with old versions of GDB.\n\
3951 Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\
3952 The special arg \"all\" is recognized to mean all signals except those\n\
3953 used by the debugger, typically SIGTRAP and SIGINT.\n",
3954 "Recognized actions include \"s\" (toggles between stop and nostop), \n\
3955 \"r\" (toggles between print and noprint), \"i\" (toggles between pass and \
3956 nopass), \"Q\" (noprint)\n\
3957 Stop means reenter debugger if this signal happens (implies print).\n\
3958 Print means print a message if this signal happens.\n\
3959 Pass means let program see this signal; otherwise program doesn't know.\n\
3960 Ignore is a synonym for nopass and noignore is a synonym for pass.\n\
3961 Pass and Stop may be combined.", NULL
));
3965 stop_command
= add_cmd ("stop", class_obscure
, not_just_help_class_command
,
3966 "There is no `stop' command, but you can set a hook on `stop'.\n\
3967 This allows you to set a list of commands to be run each time execution\n\
3968 of the program stops.", &cmdlist
);
3970 numsigs
= (int) TARGET_SIGNAL_LAST
;
3971 signal_stop
= (unsigned char *)
3972 xmalloc (sizeof (signal_stop
[0]) * numsigs
);
3973 signal_print
= (unsigned char *)
3974 xmalloc (sizeof (signal_print
[0]) * numsigs
);
3975 signal_program
= (unsigned char *)
3976 xmalloc (sizeof (signal_program
[0]) * numsigs
);
3977 for (i
= 0; i
< numsigs
; i
++)
3980 signal_print
[i
] = 1;
3981 signal_program
[i
] = 1;
3984 /* Signals caused by debugger's own actions
3985 should not be given to the program afterwards. */
3986 signal_program
[TARGET_SIGNAL_TRAP
] = 0;
3987 signal_program
[TARGET_SIGNAL_INT
] = 0;
3989 /* Signals that are not errors should not normally enter the debugger. */
3990 signal_stop
[TARGET_SIGNAL_ALRM
] = 0;
3991 signal_print
[TARGET_SIGNAL_ALRM
] = 0;
3992 signal_stop
[TARGET_SIGNAL_VTALRM
] = 0;
3993 signal_print
[TARGET_SIGNAL_VTALRM
] = 0;
3994 signal_stop
[TARGET_SIGNAL_PROF
] = 0;
3995 signal_print
[TARGET_SIGNAL_PROF
] = 0;
3996 signal_stop
[TARGET_SIGNAL_CHLD
] = 0;
3997 signal_print
[TARGET_SIGNAL_CHLD
] = 0;
3998 signal_stop
[TARGET_SIGNAL_IO
] = 0;
3999 signal_print
[TARGET_SIGNAL_IO
] = 0;
4000 signal_stop
[TARGET_SIGNAL_POLL
] = 0;
4001 signal_print
[TARGET_SIGNAL_POLL
] = 0;
4002 signal_stop
[TARGET_SIGNAL_URG
] = 0;
4003 signal_print
[TARGET_SIGNAL_URG
] = 0;
4004 signal_stop
[TARGET_SIGNAL_WINCH
] = 0;
4005 signal_print
[TARGET_SIGNAL_WINCH
] = 0;
4007 /* These signals are used internally by user-level thread
4008 implementations. (See signal(5) on Solaris.) Like the above
4009 signals, a healthy program receives and handles them as part of
4010 its normal operation. */
4011 signal_stop
[TARGET_SIGNAL_LWP
] = 0;
4012 signal_print
[TARGET_SIGNAL_LWP
] = 0;
4013 signal_stop
[TARGET_SIGNAL_WAITING
] = 0;
4014 signal_print
[TARGET_SIGNAL_WAITING
] = 0;
4015 signal_stop
[TARGET_SIGNAL_CANCEL
] = 0;
4016 signal_print
[TARGET_SIGNAL_CANCEL
] = 0;
4020 (add_set_cmd ("stop-on-solib-events", class_support
, var_zinteger
,
4021 (char *) &stop_on_solib_events
,
4022 "Set stopping for shared library events.\n\
4023 If nonzero, gdb will give control to the user when the dynamic linker\n\
4024 notifies gdb of shared library events. The most common event of interest\n\
4025 to the user would be loading/unloading of a new library.\n",
4030 c
= add_set_enum_cmd ("follow-fork-mode",
4032 follow_fork_mode_kind_names
,
4033 (char *) &follow_fork_mode_string
,
4034 /* ??rehrauer: The "both" option is broken, by what may be a 10.20
4035 kernel problem. It's also not terribly useful without a GUI to
4036 help the user drive two debuggers. So for now, I'm disabling
4037 the "both" option. */
4038 /* "Set debugger response to a program call of fork \
4040 A fork or vfork creates a new process. follow-fork-mode can be:\n\
4041 parent - the original process is debugged after a fork\n\
4042 child - the new process is debugged after a fork\n\
4043 both - both the parent and child are debugged after a fork\n\
4044 ask - the debugger will ask for one of the above choices\n\
4045 For \"both\", another copy of the debugger will be started to follow\n\
4046 the new child process. The original debugger will continue to follow\n\
4047 the original parent process. To distinguish their prompts, the\n\
4048 debugger copy's prompt will be changed.\n\
4049 For \"parent\" or \"child\", the unfollowed process will run free.\n\
4050 By default, the debugger will follow the parent process.",
4052 "Set debugger response to a program call of fork \
4054 A fork or vfork creates a new process. follow-fork-mode can be:\n\
4055 parent - the original process is debugged after a fork\n\
4056 child - the new process is debugged after a fork\n\
4057 ask - the debugger will ask for one of the above choices\n\
4058 For \"parent\" or \"child\", the unfollowed process will run free.\n\
4059 By default, the debugger will follow the parent process.",
4061 /* c->function.sfunc = ; */
4062 add_show_from_set (c
, &showlist
);
4064 set_follow_fork_mode_command ("parent", 0, NULL
);
4066 c
= add_set_enum_cmd ("scheduler-locking", class_run
,
4067 scheduler_enums
, /* array of string names */
4068 (char *) &scheduler_mode
, /* current mode */
4069 "Set mode for locking scheduler during execution.\n\
4070 off == no locking (threads may preempt at any time)\n\
4071 on == full locking (no thread except the current thread may run)\n\
4072 step == scheduler locked during every single-step operation.\n\
4073 In this mode, no other thread may run during a step command.\n\
4074 Other threads may run while stepping over a function call ('next').",
4077 c
->function
.sfunc
= set_schedlock_func
; /* traps on target vector */
4078 add_show_from_set (c
, &showlist
);