1 /* Target-struct-independent code to start (run) and stop an inferior process.
2 Copyright 1986-1989, 1991-2000 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 */
39 /* Prototypes for local functions */
41 static void signals_info (char *, int);
43 static void handle_command (char *, int);
45 static void sig_print_info (enum target_signal
);
47 static void sig_print_header (void);
49 static void resume_cleanups (void *);
51 static int hook_stop_stub (void *);
53 static void delete_breakpoint_current_contents (void *);
55 static void set_follow_fork_mode_command (char *arg
, int from_tty
,
56 struct cmd_list_element
* c
);
58 static struct inferior_status
*xmalloc_inferior_status (void);
60 static void free_inferior_status (struct inferior_status
*);
62 static int restore_selected_frame (void *);
64 static void build_infrun (void);
66 static void follow_inferior_fork (int parent_pid
, int child_pid
,
67 int has_forked
, int has_vforked
);
69 static void follow_fork (int parent_pid
, int child_pid
);
71 static void follow_vfork (int parent_pid
, int child_pid
);
73 static void set_schedlock_func (char *args
, int from_tty
,
74 struct cmd_list_element
* c
);
76 struct execution_control_state
;
78 static int currently_stepping (struct execution_control_state
*ecs
);
80 static void xdb_handle_command (char *args
, int from_tty
);
82 void _initialize_infrun (void);
84 int inferior_ignoring_startup_exec_events
= 0;
85 int inferior_ignoring_leading_exec_events
= 0;
87 /* When set, stop the 'step' command if we enter a function which has
88 no line number information. The normal behavior is that we step
89 over such function. */
90 int step_stop_if_no_debug
= 0;
92 /* In asynchronous mode, but simulating synchronous execution. */
94 int sync_execution
= 0;
96 /* wait_for_inferior and normal_stop use this to notify the user
97 when the inferior stopped in a different thread than it had been
100 static int previous_inferior_pid
;
102 /* This is true for configurations that may follow through execl() and
103 similar functions. At present this is only true for HP-UX native. */
105 #ifndef MAY_FOLLOW_EXEC
106 #define MAY_FOLLOW_EXEC (0)
109 static int may_follow_exec
= MAY_FOLLOW_EXEC
;
111 /* resume and wait_for_inferior use this to ensure that when
112 stepping over a hit breakpoint in a threaded application
113 only the thread that hit the breakpoint is stepped and the
114 other threads don't continue. This prevents having another
115 thread run past the breakpoint while it is temporarily
118 This is not thread-specific, so it isn't saved as part of
121 Versions of gdb which don't use the "step == this thread steps
122 and others continue" model but instead use the "step == this
123 thread steps and others wait" shouldn't do this. */
125 static int thread_step_needed
= 0;
127 /* This is true if thread_step_needed should actually be used. At
128 present this is only true for HP-UX native. */
130 #ifndef USE_THREAD_STEP_NEEDED
131 #define USE_THREAD_STEP_NEEDED (0)
134 static int use_thread_step_needed
= USE_THREAD_STEP_NEEDED
;
136 /* GET_LONGJMP_TARGET returns the PC at which longjmp() will resume the
137 program. It needs to examine the jmp_buf argument and extract the PC
138 from it. The return value is non-zero on success, zero otherwise. */
140 #ifndef GET_LONGJMP_TARGET
141 #define GET_LONGJMP_TARGET(PC_ADDR) 0
145 /* Some machines have trampoline code that sits between function callers
146 and the actual functions themselves. If this machine doesn't have
147 such things, disable their processing. */
149 #ifndef SKIP_TRAMPOLINE_CODE
150 #define SKIP_TRAMPOLINE_CODE(pc) 0
153 /* Dynamic function trampolines are similar to solib trampolines in that they
154 are between the caller and the callee. The difference is that when you
155 enter a dynamic trampoline, you can't determine the callee's address. Some
156 (usually complex) code needs to run in the dynamic trampoline to figure out
157 the callee's address. This macro is usually called twice. First, when we
158 enter the trampoline (looks like a normal function call at that point). It
159 should return the PC of a point within the trampoline where the callee's
160 address is known. Second, when we hit the breakpoint, this routine returns
161 the callee's address. At that point, things proceed as per a step resume
164 #ifndef DYNAMIC_TRAMPOLINE_NEXTPC
165 #define DYNAMIC_TRAMPOLINE_NEXTPC(pc) 0
168 /* If the program uses ELF-style shared libraries, then calls to
169 functions in shared libraries go through stubs, which live in a
170 table called the PLT (Procedure Linkage Table). The first time the
171 function is called, the stub sends control to the dynamic linker,
172 which looks up the function's real address, patches the stub so
173 that future calls will go directly to the function, and then passes
174 control to the function.
176 If we are stepping at the source level, we don't want to see any of
177 this --- we just want to skip over the stub and the dynamic linker.
178 The simple approach is to single-step until control leaves the
181 However, on some systems (e.g., Red Hat Linux 5.2) the dynamic
182 linker calls functions in the shared C library, so you can't tell
183 from the PC alone whether the dynamic linker is still running. In
184 this case, we use a step-resume breakpoint to get us past the
185 dynamic linker, as if we were using "next" to step over a function
188 IN_SOLIB_DYNSYM_RESOLVE_CODE says whether we're in the dynamic
189 linker code or not. Normally, this means we single-step. However,
190 if SKIP_SOLIB_RESOLVER then returns non-zero, then its value is an
191 address where we can place a step-resume breakpoint to get past the
192 linker's symbol resolution function.
194 IN_SOLIB_DYNSYM_RESOLVE_CODE can generally be implemented in a
195 pretty portable way, by comparing the PC against the address ranges
196 of the dynamic linker's sections.
198 SKIP_SOLIB_RESOLVER is generally going to be system-specific, since
199 it depends on internal details of the dynamic linker. It's usually
200 not too hard to figure out where to put a breakpoint, but it
201 certainly isn't portable. SKIP_SOLIB_RESOLVER should do plenty of
202 sanity checking. If it can't figure things out, returning zero and
203 getting the (possibly confusing) stepping behavior is better than
204 signalling an error, which will obscure the change in the
207 #ifndef IN_SOLIB_DYNSYM_RESOLVE_CODE
208 #define IN_SOLIB_DYNSYM_RESOLVE_CODE(pc) 0
211 #ifndef SKIP_SOLIB_RESOLVER
212 #define SKIP_SOLIB_RESOLVER(pc) 0
215 /* For SVR4 shared libraries, each call goes through a small piece of
216 trampoline code in the ".plt" section. IN_SOLIB_CALL_TRAMPOLINE evaluates
217 to nonzero if we are current stopped in one of these. */
219 #ifndef IN_SOLIB_CALL_TRAMPOLINE
220 #define IN_SOLIB_CALL_TRAMPOLINE(pc,name) 0
223 /* In some shared library schemes, the return path from a shared library
224 call may need to go through a trampoline too. */
226 #ifndef IN_SOLIB_RETURN_TRAMPOLINE
227 #define IN_SOLIB_RETURN_TRAMPOLINE(pc,name) 0
230 /* This function returns TRUE if pc is the address of an instruction
231 that lies within the dynamic linker (such as the event hook, or the
234 This function must be used only when a dynamic linker event has
235 been caught, and the inferior is being stepped out of the hook, or
236 undefined results are guaranteed. */
238 #ifndef SOLIB_IN_DYNAMIC_LINKER
239 #define SOLIB_IN_DYNAMIC_LINKER(pid,pc) 0
242 /* On MIPS16, a function that returns a floating point value may call
243 a library helper function to copy the return value to a floating point
244 register. The IGNORE_HELPER_CALL macro returns non-zero if we
245 should ignore (i.e. step over) this function call. */
246 #ifndef IGNORE_HELPER_CALL
247 #define IGNORE_HELPER_CALL(pc) 0
250 /* On some systems, the PC may be left pointing at an instruction that won't
251 actually be executed. This is usually indicated by a bit in the PSW. If
252 we find ourselves in such a state, then we step the target beyond the
253 nullified instruction before returning control to the user so as to avoid
256 #ifndef INSTRUCTION_NULLIFIED
257 #define INSTRUCTION_NULLIFIED 0
260 /* We can't step off a permanent breakpoint in the ordinary way, because we
261 can't remove it. Instead, we have to advance the PC to the next
262 instruction. This macro should expand to a pointer to a function that
263 does that, or zero if we have no such function. If we don't have a
264 definition for it, we have to report an error. */
265 #ifndef SKIP_PERMANENT_BREAKPOINT
266 #define SKIP_PERMANENT_BREAKPOINT (default_skip_permanent_breakpoint)
268 default_skip_permanent_breakpoint (void)
271 fprintf_filtered (gdb_stderr
, "\
272 The program is stopped at a permanent breakpoint, but GDB does not know\n\
273 how to step past a permanent breakpoint on this architecture. Try using\n\
274 a command like `return' or `jump' to continue execution.\n");
275 return_to_top_level (RETURN_ERROR
);
280 /* Convert the #defines into values. This is temporary until wfi control
281 flow is completely sorted out. */
283 #ifndef HAVE_STEPPABLE_WATCHPOINT
284 #define HAVE_STEPPABLE_WATCHPOINT 0
286 #undef HAVE_STEPPABLE_WATCHPOINT
287 #define HAVE_STEPPABLE_WATCHPOINT 1
290 #ifndef HAVE_NONSTEPPABLE_WATCHPOINT
291 #define HAVE_NONSTEPPABLE_WATCHPOINT 0
293 #undef HAVE_NONSTEPPABLE_WATCHPOINT
294 #define HAVE_NONSTEPPABLE_WATCHPOINT 1
297 #ifndef HAVE_CONTINUABLE_WATCHPOINT
298 #define HAVE_CONTINUABLE_WATCHPOINT 0
300 #undef HAVE_CONTINUABLE_WATCHPOINT
301 #define HAVE_CONTINUABLE_WATCHPOINT 1
304 #ifndef CANNOT_STEP_HW_WATCHPOINTS
305 #define CANNOT_STEP_HW_WATCHPOINTS 0
307 #undef CANNOT_STEP_HW_WATCHPOINTS
308 #define CANNOT_STEP_HW_WATCHPOINTS 1
311 /* Tables of how to react to signals; the user sets them. */
313 static unsigned char *signal_stop
;
314 static unsigned char *signal_print
;
315 static unsigned char *signal_program
;
317 #define SET_SIGS(nsigs,sigs,flags) \
319 int signum = (nsigs); \
320 while (signum-- > 0) \
321 if ((sigs)[signum]) \
322 (flags)[signum] = 1; \
325 #define UNSET_SIGS(nsigs,sigs,flags) \
327 int signum = (nsigs); \
328 while (signum-- > 0) \
329 if ((sigs)[signum]) \
330 (flags)[signum] = 0; \
334 /* Command list pointer for the "stop" placeholder. */
336 static struct cmd_list_element
*stop_command
;
338 /* Nonzero if breakpoints are now inserted in the inferior. */
340 static int breakpoints_inserted
;
342 /* Function inferior was in as of last step command. */
344 static struct symbol
*step_start_function
;
346 /* Nonzero if we are expecting a trace trap and should proceed from it. */
348 static int trap_expected
;
351 /* Nonzero if we want to give control to the user when we're notified
352 of shared library events by the dynamic linker. */
353 static int stop_on_solib_events
;
357 /* Nonzero if the next time we try to continue the inferior, it will
358 step one instruction and generate a spurious trace trap.
359 This is used to compensate for a bug in HP-UX. */
361 static int trap_expected_after_continue
;
364 /* Nonzero means expecting a trace trap
365 and should stop the inferior and return silently when it happens. */
369 /* Nonzero means expecting a trap and caller will handle it themselves.
370 It is used after attach, due to attaching to a process;
371 when running in the shell before the child program has been exec'd;
372 and when running some kinds of remote stuff (FIXME?). */
374 int stop_soon_quietly
;
376 /* Nonzero if proceed is being used for a "finish" command or a similar
377 situation when stop_registers should be saved. */
379 int proceed_to_finish
;
381 /* Save register contents here when about to pop a stack dummy frame,
382 if-and-only-if proceed_to_finish is set.
383 Thus this contains the return value from the called function (assuming
384 values are returned in a register). */
386 char *stop_registers
;
388 /* Nonzero if program stopped due to error trying to insert breakpoints. */
390 static int breakpoints_failed
;
392 /* Nonzero after stop if current stack frame should be printed. */
394 static int stop_print_frame
;
396 static struct breakpoint
*step_resume_breakpoint
= NULL
;
397 static struct breakpoint
*through_sigtramp_breakpoint
= NULL
;
399 /* On some platforms (e.g., HP-UX), hardware watchpoints have bad
400 interactions with an inferior that is running a kernel function
401 (aka, a system call or "syscall"). wait_for_inferior therefore
402 may have a need to know when the inferior is in a syscall. This
403 is a count of the number of inferior threads which are known to
404 currently be running in a syscall. */
405 static int number_of_threads_in_syscalls
;
407 /* This is used to remember when a fork, vfork or exec event
408 was caught by a catchpoint, and thus the event is to be
409 followed at the next resume of the inferior, and not
413 enum target_waitkind kind
;
423 char *execd_pathname
;
427 /* Some platforms don't allow us to do anything meaningful with a
428 vforked child until it has exec'd. Vforked processes on such
429 platforms can only be followed after they've exec'd.
431 When this is set to 0, a vfork can be immediately followed,
432 and an exec can be followed merely as an exec. When this is
433 set to 1, a vfork event has been seen, but cannot be followed
434 until the exec is seen.
436 (In the latter case, inferior_pid is still the parent of the
437 vfork, and pending_follow.fork_event.child_pid is the child. The
438 appropriate process is followed, according to the setting of
439 follow-fork-mode.) */
440 static int follow_vfork_when_exec
;
442 static const char follow_fork_mode_ask
[] = "ask";
443 static const char follow_fork_mode_both
[] = "both";
444 static const char follow_fork_mode_child
[] = "child";
445 static const char follow_fork_mode_parent
[] = "parent";
447 static const char *follow_fork_mode_kind_names
[] =
449 follow_fork_mode_ask
,
450 /* ??rehrauer: The "both" option is broken, by what may be a 10.20
451 kernel problem. It's also not terribly useful without a GUI to
452 help the user drive two debuggers. So for now, I'm disabling the
454 /* follow_fork_mode_both, */
455 follow_fork_mode_child
,
456 follow_fork_mode_parent
,
460 static const char *follow_fork_mode_string
= follow_fork_mode_parent
;
464 follow_inferior_fork (int parent_pid
, int child_pid
, int has_forked
,
467 int followed_parent
= 0;
468 int followed_child
= 0;
470 /* Which process did the user want us to follow? */
471 const char *follow_mode
= follow_fork_mode_string
;
473 /* Or, did the user not know, and want us to ask? */
474 if (follow_fork_mode_string
== follow_fork_mode_ask
)
476 internal_error ("follow_inferior_fork: \"ask\" mode not implemented");
477 /* follow_mode = follow_fork_mode_...; */
480 /* If we're to be following the parent, then detach from child_pid.
481 We're already following the parent, so need do nothing explicit
483 if (follow_mode
== follow_fork_mode_parent
)
487 /* We're already attached to the parent, by default. */
489 /* Before detaching from the child, remove all breakpoints from
490 it. (This won't actually modify the breakpoint list, but will
491 physically remove the breakpoints from the child.) */
492 if (!has_vforked
|| !follow_vfork_when_exec
)
494 detach_breakpoints (child_pid
);
495 #ifdef SOLIB_REMOVE_INFERIOR_HOOK
496 SOLIB_REMOVE_INFERIOR_HOOK (child_pid
);
500 /* Detach from the child. */
503 target_require_detach (child_pid
, "", 1);
506 /* If we're to be following the child, then attach to it, detach
507 from inferior_pid, and set inferior_pid to child_pid. */
508 else if (follow_mode
== follow_fork_mode_child
)
510 char child_pid_spelling
[100]; /* Arbitrary length. */
514 /* Before detaching from the parent, detach all breakpoints from
515 the child. But only if we're forking, or if we follow vforks
516 as soon as they happen. (If we're following vforks only when
517 the child has exec'd, then it's very wrong to try to write
518 back the "shadow contents" of inserted breakpoints now -- they
519 belong to the child's pre-exec'd a.out.) */
520 if (!has_vforked
|| !follow_vfork_when_exec
)
522 detach_breakpoints (child_pid
);
525 /* Before detaching from the parent, remove all breakpoints from it. */
526 remove_breakpoints ();
528 /* Also reset the solib inferior hook from the parent. */
529 #ifdef SOLIB_REMOVE_INFERIOR_HOOK
530 SOLIB_REMOVE_INFERIOR_HOOK (inferior_pid
);
533 /* Detach from the parent. */
535 target_detach (NULL
, 1);
537 /* Attach to the child. */
538 inferior_pid
= child_pid
;
539 sprintf (child_pid_spelling
, "%d", child_pid
);
542 target_require_attach (child_pid_spelling
, 1);
544 /* Was there a step_resume breakpoint? (There was if the user
545 did a "next" at the fork() call.) If so, explicitly reset its
548 step_resumes are a form of bp that are made to be per-thread.
549 Since we created the step_resume bp when the parent process
550 was being debugged, and now are switching to the child process,
551 from the breakpoint package's viewpoint, that's a switch of
552 "threads". We must update the bp's notion of which thread
553 it is for, or it'll be ignored when it triggers... */
554 if (step_resume_breakpoint
&&
555 (!has_vforked
|| !follow_vfork_when_exec
))
556 breakpoint_re_set_thread (step_resume_breakpoint
);
558 /* Reinsert all breakpoints in the child. (The user may've set
559 breakpoints after catching the fork, in which case those
560 actually didn't get set in the child, but only in the parent.) */
561 if (!has_vforked
|| !follow_vfork_when_exec
)
563 breakpoint_re_set ();
564 insert_breakpoints ();
568 /* If we're to be following both parent and child, then fork ourselves,
569 and attach the debugger clone to the child. */
570 else if (follow_mode
== follow_fork_mode_both
)
572 char pid_suffix
[100]; /* Arbitrary length. */
574 /* Clone ourselves to follow the child. This is the end of our
575 involvement with child_pid; our clone will take it from here... */
577 target_clone_and_follow_inferior (child_pid
, &followed_child
);
578 followed_parent
= !followed_child
;
580 /* We continue to follow the parent. To help distinguish the two
581 debuggers, though, both we and our clone will reset our prompts. */
582 sprintf (pid_suffix
, "[%d] ", inferior_pid
);
583 set_prompt (strcat (get_prompt (), pid_suffix
));
586 /* The parent and child of a vfork share the same address space.
587 Also, on some targets the order in which vfork and exec events
588 are received for parent in child requires some delicate handling
591 For instance, on ptrace-based HPUX we receive the child's vfork
592 event first, at which time the parent has been suspended by the
593 OS and is essentially untouchable until the child's exit or second
594 exec event arrives. At that time, the parent's vfork event is
595 delivered to us, and that's when we see and decide how to follow
596 the vfork. But to get to that point, we must continue the child
597 until it execs or exits. To do that smoothly, all breakpoints
598 must be removed from the child, in case there are any set between
599 the vfork() and exec() calls. But removing them from the child
600 also removes them from the parent, due to the shared-address-space
601 nature of a vfork'd parent and child. On HPUX, therefore, we must
602 take care to restore the bp's to the parent before we continue it.
603 Else, it's likely that we may not stop in the expected place. (The
604 worst scenario is when the user tries to step over a vfork() call;
605 the step-resume bp must be restored for the step to properly stop
606 in the parent after the call completes!)
608 Sequence of events, as reported to gdb from HPUX:
610 Parent Child Action for gdb to take
611 -------------------------------------------------------
612 1 VFORK Continue child
618 target_post_follow_vfork (parent_pid
,
624 pending_follow
.fork_event
.saw_parent_fork
= 0;
625 pending_follow
.fork_event
.saw_child_fork
= 0;
629 follow_fork (int parent_pid
, int child_pid
)
631 follow_inferior_fork (parent_pid
, child_pid
, 1, 0);
635 /* Forward declaration. */
636 static void follow_exec (int, char *);
639 follow_vfork (int parent_pid
, int child_pid
)
641 follow_inferior_fork (parent_pid
, child_pid
, 0, 1);
643 /* Did we follow the child? Had it exec'd before we saw the parent vfork? */
644 if (pending_follow
.fork_event
.saw_child_exec
&& (inferior_pid
== child_pid
))
646 pending_follow
.fork_event
.saw_child_exec
= 0;
647 pending_follow
.kind
= TARGET_WAITKIND_SPURIOUS
;
648 follow_exec (inferior_pid
, pending_follow
.execd_pathname
);
649 free (pending_follow
.execd_pathname
);
654 follow_exec (int pid
, char *execd_pathname
)
657 struct target_ops
*tgt
;
659 if (!may_follow_exec
)
662 /* Did this exec() follow a vfork()? If so, we must follow the
663 vfork now too. Do it before following the exec. */
664 if (follow_vfork_when_exec
&&
665 (pending_follow
.kind
== TARGET_WAITKIND_VFORKED
))
667 pending_follow
.kind
= TARGET_WAITKIND_SPURIOUS
;
668 follow_vfork (inferior_pid
, pending_follow
.fork_event
.child_pid
);
669 follow_vfork_when_exec
= 0;
670 saved_pid
= inferior_pid
;
672 /* Did we follow the parent? If so, we're done. If we followed
673 the child then we must also follow its exec(). */
674 if (inferior_pid
== pending_follow
.fork_event
.parent_pid
)
678 /* This is an exec event that we actually wish to pay attention to.
679 Refresh our symbol table to the newly exec'd program, remove any
682 If there are breakpoints, they aren't really inserted now,
683 since the exec() transformed our inferior into a fresh set
686 We want to preserve symbolic breakpoints on the list, since
687 we have hopes that they can be reset after the new a.out's
688 symbol table is read.
690 However, any "raw" breakpoints must be removed from the list
691 (e.g., the solib bp's), since their address is probably invalid
694 And, we DON'T want to call delete_breakpoints() here, since
695 that may write the bp's "shadow contents" (the instruction
696 value that was overwritten witha TRAP instruction). Since
697 we now have a new a.out, those shadow contents aren't valid. */
698 update_breakpoints_after_exec ();
700 /* If there was one, it's gone now. We cannot truly step-to-next
701 statement through an exec(). */
702 step_resume_breakpoint
= NULL
;
703 step_range_start
= 0;
706 /* If there was one, it's gone now. */
707 through_sigtramp_breakpoint
= NULL
;
709 /* What is this a.out's name? */
710 printf_unfiltered ("Executing new program: %s\n", execd_pathname
);
712 /* We've followed the inferior through an exec. Therefore, the
713 inferior has essentially been killed & reborn. */
715 /* First collect the run target in effect. */
716 tgt
= find_run_target ();
717 /* If we can't find one, things are in a very strange state... */
719 error ("Could find run target to save before following exec");
721 gdb_flush (gdb_stdout
);
722 target_mourn_inferior ();
723 inferior_pid
= saved_pid
; /* Because mourn_inferior resets inferior_pid. */
726 /* That a.out is now the one to use. */
727 exec_file_attach (execd_pathname
, 0);
729 /* And also is where symbols can be found. */
730 symbol_file_command (execd_pathname
, 0);
732 /* Reset the shared library package. This ensures that we get
733 a shlib event when the child reaches "_start", at which point
734 the dld will have had a chance to initialize the child. */
735 #if defined(SOLIB_RESTART)
738 #ifdef SOLIB_CREATE_INFERIOR_HOOK
739 SOLIB_CREATE_INFERIOR_HOOK (inferior_pid
);
742 /* Reinsert all breakpoints. (Those which were symbolic have
743 been reset to the proper address in the new a.out, thanks
744 to symbol_file_command...) */
745 insert_breakpoints ();
747 /* The next resume of this inferior should bring it to the shlib
748 startup breakpoints. (If the user had also set bp's on
749 "main" from the old (parent) process, then they'll auto-
750 matically get reset there in the new process.) */
753 /* Non-zero if we just simulating a single-step. This is needed
754 because we cannot remove the breakpoints in the inferior process
755 until after the `wait' in `wait_for_inferior'. */
756 static int singlestep_breakpoints_inserted_p
= 0;
759 /* Things to clean up if we QUIT out of resume (). */
762 resume_cleanups (void *ignore
)
767 static const char schedlock_off
[] = "off";
768 static const char schedlock_on
[] = "on";
769 static const char schedlock_step
[] = "step";
770 static const char *scheduler_mode
= schedlock_off
;
771 static const char *scheduler_enums
[] =
780 set_schedlock_func (char *args
, int from_tty
, struct cmd_list_element
*c
)
782 if (c
->type
== set_cmd
)
783 if (!target_can_lock_scheduler
)
785 scheduler_mode
= schedlock_off
;
786 error ("Target '%s' cannot support this command.",
794 /* Resume the inferior, but allow a QUIT. This is useful if the user
795 wants to interrupt some lengthy single-stepping operation
796 (for child processes, the SIGINT goes to the inferior, and so
797 we get a SIGINT random_signal, but for remote debugging and perhaps
798 other targets, that's not true).
800 STEP nonzero if we should step (zero to continue instead).
801 SIG is the signal to give the inferior (zero for none). */
803 resume (int step
, enum target_signal sig
)
805 int should_resume
= 1;
806 struct cleanup
*old_cleanups
= make_cleanup (resume_cleanups
, 0);
809 #ifdef CANNOT_STEP_BREAKPOINT
810 /* Most targets can step a breakpoint instruction, thus executing it
811 normally. But if this one cannot, just continue and we will hit
813 if (step
&& breakpoints_inserted
&& breakpoint_here_p (read_pc ()))
817 /* Some targets (e.g. Solaris x86) have a kernel bug when stepping
818 over an instruction that causes a page fault without triggering
819 a hardware watchpoint. The kernel properly notices that it shouldn't
820 stop, because the hardware watchpoint is not triggered, but it forgets
821 the step request and continues the program normally.
822 Work around the problem by removing hardware watchpoints if a step is
823 requested, GDB will check for a hardware watchpoint trigger after the
825 if (CANNOT_STEP_HW_WATCHPOINTS
&& step
&& breakpoints_inserted
)
826 remove_hw_watchpoints ();
829 /* Normally, by the time we reach `resume', the breakpoints are either
830 removed or inserted, as appropriate. The exception is if we're sitting
831 at a permanent breakpoint; we need to step over it, but permanent
832 breakpoints can't be removed. So we have to test for it here. */
833 if (breakpoint_here_p (read_pc ()) == permanent_breakpoint_here
)
834 SKIP_PERMANENT_BREAKPOINT ();
836 if (SOFTWARE_SINGLE_STEP_P
&& step
)
838 /* Do it the hard way, w/temp breakpoints */
839 SOFTWARE_SINGLE_STEP (sig
, 1 /*insert-breakpoints */ );
840 /* ...and don't ask hardware to do it. */
842 /* and do not pull these breakpoints until after a `wait' in
843 `wait_for_inferior' */
844 singlestep_breakpoints_inserted_p
= 1;
847 /* Handle any optimized stores to the inferior NOW... */
848 #ifdef DO_DEFERRED_STORES
852 /* If there were any forks/vforks/execs that were caught and are
853 now to be followed, then do so. */
854 switch (pending_follow
.kind
)
856 case (TARGET_WAITKIND_FORKED
):
857 pending_follow
.kind
= TARGET_WAITKIND_SPURIOUS
;
858 follow_fork (inferior_pid
, pending_follow
.fork_event
.child_pid
);
861 case (TARGET_WAITKIND_VFORKED
):
863 int saw_child_exec
= pending_follow
.fork_event
.saw_child_exec
;
865 pending_follow
.kind
= TARGET_WAITKIND_SPURIOUS
;
866 follow_vfork (inferior_pid
, pending_follow
.fork_event
.child_pid
);
868 /* Did we follow the child, but not yet see the child's exec event?
869 If so, then it actually ought to be waiting for us; we respond to
870 parent vfork events. We don't actually want to resume the child
871 in this situation; we want to just get its exec event. */
872 if (!saw_child_exec
&&
873 (inferior_pid
== pending_follow
.fork_event
.child_pid
))
878 case (TARGET_WAITKIND_EXECD
):
879 /* If we saw a vfork event but couldn't follow it until we saw
880 an exec, then now might be the time! */
881 pending_follow
.kind
= TARGET_WAITKIND_SPURIOUS
;
882 /* follow_exec is called as soon as the exec event is seen. */
889 /* Install inferior's terminal modes. */
890 target_terminal_inferior ();
896 if (use_thread_step_needed
&& thread_step_needed
)
898 /* We stopped on a BPT instruction;
899 don't continue other threads and
900 just step this thread. */
901 thread_step_needed
= 0;
903 if (!breakpoint_here_p (read_pc ()))
905 /* Breakpoint deleted: ok to do regular resume
906 where all the threads either step or continue. */
913 warning ("Internal error, changing continue to step.");
914 remove_breakpoints ();
915 breakpoints_inserted
= 0;
919 resume_pid
= inferior_pid
;
924 /* Vanilla resume. */
925 if ((scheduler_mode
== schedlock_on
) ||
926 (scheduler_mode
== schedlock_step
&& step
!= 0))
927 resume_pid
= inferior_pid
;
931 target_resume (resume_pid
, step
, sig
);
934 discard_cleanups (old_cleanups
);
938 /* Clear out all variables saying what to do when inferior is continued.
939 First do this, then set the ones you want, then call `proceed'. */
942 clear_proceed_status (void)
945 step_range_start
= 0;
947 step_frame_address
= 0;
948 step_over_calls
= STEP_OVER_UNDEBUGGABLE
;
950 stop_soon_quietly
= 0;
951 proceed_to_finish
= 0;
952 breakpoint_proceeded
= 1; /* We're about to proceed... */
954 /* Discard any remaining commands or status from previous stop. */
955 bpstat_clear (&stop_bpstat
);
958 /* Basic routine for continuing the program in various fashions.
960 ADDR is the address to resume at, or -1 for resume where stopped.
961 SIGGNAL is the signal to give it, or 0 for none,
962 or -1 for act according to how it stopped.
963 STEP is nonzero if should trap after one instruction.
964 -1 means return after that and print nothing.
965 You should probably set various step_... variables
966 before calling here, if you are stepping.
968 You should call clear_proceed_status before calling proceed. */
971 proceed (CORE_ADDR addr
, enum target_signal siggnal
, int step
)
976 step_start_function
= find_pc_function (read_pc ());
980 if (addr
== (CORE_ADDR
) -1)
982 /* If there is a breakpoint at the address we will resume at,
983 step one instruction before inserting breakpoints
984 so that we do not stop right away (and report a second
985 hit at this breakpoint). */
987 if (read_pc () == stop_pc
&& breakpoint_here_p (read_pc ()))
990 #ifndef STEP_SKIPS_DELAY
991 #define STEP_SKIPS_DELAY(pc) (0)
992 #define STEP_SKIPS_DELAY_P (0)
994 /* Check breakpoint_here_p first, because breakpoint_here_p is fast
995 (it just checks internal GDB data structures) and STEP_SKIPS_DELAY
996 is slow (it needs to read memory from the target). */
997 if (STEP_SKIPS_DELAY_P
998 && breakpoint_here_p (read_pc () + 4)
999 && STEP_SKIPS_DELAY (read_pc ()))
1006 /* New address; we don't need to single-step a thread
1007 over a breakpoint we just hit, 'cause we aren't
1008 continuing from there.
1010 It's not worth worrying about the case where a user
1011 asks for a "jump" at the current PC--if they get the
1012 hiccup of re-hiting a hit breakpoint, what else do
1014 thread_step_needed
= 0;
1017 #ifdef PREPARE_TO_PROCEED
1018 /* In a multi-threaded task we may select another thread
1019 and then continue or step.
1021 But if the old thread was stopped at a breakpoint, it
1022 will immediately cause another breakpoint stop without
1023 any execution (i.e. it will report a breakpoint hit
1024 incorrectly). So we must step over it first.
1026 PREPARE_TO_PROCEED checks the current thread against the thread
1027 that reported the most recent event. If a step-over is required
1028 it returns TRUE and sets the current thread to the old thread. */
1029 if (PREPARE_TO_PROCEED (1) && breakpoint_here_p (read_pc ()))
1032 thread_step_needed
= 1;
1035 #endif /* PREPARE_TO_PROCEED */
1038 if (trap_expected_after_continue
)
1040 /* If (step == 0), a trap will be automatically generated after
1041 the first instruction is executed. Force step one
1042 instruction to clear this condition. This should not occur
1043 if step is nonzero, but it is harmless in that case. */
1045 trap_expected_after_continue
= 0;
1047 #endif /* HP_OS_BUG */
1050 /* We will get a trace trap after one instruction.
1051 Continue it automatically and insert breakpoints then. */
1055 int temp
= insert_breakpoints ();
1058 print_sys_errmsg ("insert_breakpoints", temp
);
1059 error ("Cannot insert breakpoints.\n\
1060 The same program may be running in another process,\n\
1061 or you may have requested too many hardware\n\
1062 breakpoints and/or watchpoints.\n");
1065 breakpoints_inserted
= 1;
1068 if (siggnal
!= TARGET_SIGNAL_DEFAULT
)
1069 stop_signal
= siggnal
;
1070 /* If this signal should not be seen by program,
1071 give it zero. Used for debugging signals. */
1072 else if (!signal_program
[stop_signal
])
1073 stop_signal
= TARGET_SIGNAL_0
;
1075 annotate_starting ();
1077 /* Make sure that output from GDB appears before output from the
1079 gdb_flush (gdb_stdout
);
1081 /* Resume inferior. */
1082 resume (oneproc
|| step
|| bpstat_should_step (), stop_signal
);
1084 /* Wait for it to stop (if not standalone)
1085 and in any case decode why it stopped, and act accordingly. */
1086 /* Do this only if we are not using the event loop, or if the target
1087 does not support asynchronous execution. */
1088 if (!event_loop_p
|| !target_can_async_p ())
1090 wait_for_inferior ();
1095 /* Record the pc and sp of the program the last time it stopped.
1096 These are just used internally by wait_for_inferior, but need
1097 to be preserved over calls to it and cleared when the inferior
1099 static CORE_ADDR prev_pc
;
1100 static CORE_ADDR prev_func_start
;
1101 static char *prev_func_name
;
1104 /* Start remote-debugging of a machine over a serial link. */
1109 init_thread_list ();
1110 init_wait_for_inferior ();
1111 stop_soon_quietly
= 1;
1114 /* Always go on waiting for the target, regardless of the mode. */
1115 /* FIXME: cagney/1999-09-23: At present it isn't possible to
1116 indicate to wait_for_inferior that a target should timeout if
1117 nothing is returned (instead of just blocking). Because of this,
1118 targets expecting an immediate response need to, internally, set
1119 things up so that the target_wait() is forced to eventually
1121 /* FIXME: cagney/1999-09-24: It isn't possible for target_open() to
1122 differentiate to its caller what the state of the target is after
1123 the initial open has been performed. Here we're assuming that
1124 the target has stopped. It should be possible to eventually have
1125 target_open() return to the caller an indication that the target
1126 is currently running and GDB state should be set to the same as
1127 for an async run. */
1128 wait_for_inferior ();
1132 /* Initialize static vars when a new inferior begins. */
1135 init_wait_for_inferior (void)
1137 /* These are meaningless until the first time through wait_for_inferior. */
1139 prev_func_start
= 0;
1140 prev_func_name
= NULL
;
1143 trap_expected_after_continue
= 0;
1145 breakpoints_inserted
= 0;
1146 breakpoint_init_inferior (inf_starting
);
1148 /* Don't confuse first call to proceed(). */
1149 stop_signal
= TARGET_SIGNAL_0
;
1151 /* The first resume is not following a fork/vfork/exec. */
1152 pending_follow
.kind
= TARGET_WAITKIND_SPURIOUS
; /* I.e., none. */
1153 pending_follow
.fork_event
.saw_parent_fork
= 0;
1154 pending_follow
.fork_event
.saw_child_fork
= 0;
1155 pending_follow
.fork_event
.saw_child_exec
= 0;
1157 /* See wait_for_inferior's handling of SYSCALL_ENTRY/RETURN events. */
1158 number_of_threads_in_syscalls
= 0;
1160 clear_proceed_status ();
1164 delete_breakpoint_current_contents (void *arg
)
1166 struct breakpoint
**breakpointp
= (struct breakpoint
**) arg
;
1167 if (*breakpointp
!= NULL
)
1169 delete_breakpoint (*breakpointp
);
1170 *breakpointp
= NULL
;
1174 /* This enum encodes possible reasons for doing a target_wait, so that
1175 wfi can call target_wait in one place. (Ultimately the call will be
1176 moved out of the infinite loop entirely.) */
1180 infwait_normal_state
,
1181 infwait_thread_hop_state
,
1182 infwait_nullified_state
,
1183 infwait_nonstep_watch_state
1186 /* Why did the inferior stop? Used to print the appropriate messages
1187 to the interface from within handle_inferior_event(). */
1188 enum inferior_stop_reason
1190 /* We don't know why. */
1192 /* Step, next, nexti, stepi finished. */
1194 /* Found breakpoint. */
1196 /* Inferior terminated by signal. */
1198 /* Inferior exited. */
1200 /* Inferior received signal, and user asked to be notified. */
1204 /* This structure contains what used to be local variables in
1205 wait_for_inferior. Probably many of them can return to being
1206 locals in handle_inferior_event. */
1208 struct execution_control_state
1210 struct target_waitstatus ws
;
1211 struct target_waitstatus
*wp
;
1214 CORE_ADDR stop_func_start
;
1215 CORE_ADDR stop_func_end
;
1216 char *stop_func_name
;
1217 struct symtab_and_line sal
;
1218 int remove_breakpoints_on_following_step
;
1220 struct symtab
*current_symtab
;
1221 int handling_longjmp
; /* FIXME */
1223 int saved_inferior_pid
;
1225 int stepping_through_solib_after_catch
;
1226 bpstat stepping_through_solib_catchpoints
;
1227 int enable_hw_watchpoints_after_wait
;
1228 int stepping_through_sigtramp
;
1229 int new_thread_event
;
1230 struct target_waitstatus tmpstatus
;
1231 enum infwait_states infwait_state
;
1236 void init_execution_control_state (struct execution_control_state
* ecs
);
1238 void handle_inferior_event (struct execution_control_state
* ecs
);
1240 static void check_sigtramp2 (struct execution_control_state
*ecs
);
1241 static void step_into_function (struct execution_control_state
*ecs
);
1242 static void step_over_function (struct execution_control_state
*ecs
);
1243 static void stop_stepping (struct execution_control_state
*ecs
);
1244 static void prepare_to_wait (struct execution_control_state
*ecs
);
1245 static void keep_going (struct execution_control_state
*ecs
);
1246 static void print_stop_reason (enum inferior_stop_reason stop_reason
, int stop_info
);
1248 /* Wait for control to return from inferior to debugger.
1249 If inferior gets a signal, we may decide to start it up again
1250 instead of returning. That is why there is a loop in this function.
1251 When this function actually returns it means the inferior
1252 should be left stopped and GDB should read more commands. */
1255 wait_for_inferior (void)
1257 struct cleanup
*old_cleanups
;
1258 struct execution_control_state ecss
;
1259 struct execution_control_state
*ecs
;
1261 old_cleanups
= make_cleanup (delete_breakpoint_current_contents
,
1262 &step_resume_breakpoint
);
1263 make_cleanup (delete_breakpoint_current_contents
,
1264 &through_sigtramp_breakpoint
);
1266 /* wfi still stays in a loop, so it's OK just to take the address of
1267 a local to get the ecs pointer. */
1270 /* Fill in with reasonable starting values. */
1271 init_execution_control_state (ecs
);
1273 thread_step_needed
= 0;
1275 /* We'll update this if & when we switch to a new thread. */
1276 previous_inferior_pid
= inferior_pid
;
1278 overlay_cache_invalid
= 1;
1280 /* We have to invalidate the registers BEFORE calling target_wait
1281 because they can be loaded from the target while in target_wait.
1282 This makes remote debugging a bit more efficient for those
1283 targets that provide critical registers as part of their normal
1284 status mechanism. */
1286 registers_changed ();
1290 if (target_wait_hook
)
1291 ecs
->pid
= target_wait_hook (ecs
->waiton_pid
, ecs
->wp
);
1293 ecs
->pid
= target_wait (ecs
->waiton_pid
, ecs
->wp
);
1295 /* Now figure out what to do with the result of the result. */
1296 handle_inferior_event (ecs
);
1298 if (!ecs
->wait_some_more
)
1301 do_cleanups (old_cleanups
);
1304 /* Asynchronous version of wait_for_inferior. It is called by the
1305 event loop whenever a change of state is detected on the file
1306 descriptor corresponding to the target. It can be called more than
1307 once to complete a single execution command. In such cases we need
1308 to keep the state in a global variable ASYNC_ECSS. If it is the
1309 last time that this function is called for a single execution
1310 command, then report to the user that the inferior has stopped, and
1311 do the necessary cleanups. */
1313 struct execution_control_state async_ecss
;
1314 struct execution_control_state
*async_ecs
;
1317 fetch_inferior_event (void *client_data
)
1319 static struct cleanup
*old_cleanups
;
1321 async_ecs
= &async_ecss
;
1323 if (!async_ecs
->wait_some_more
)
1325 old_cleanups
= make_exec_cleanup (delete_breakpoint_current_contents
,
1326 &step_resume_breakpoint
);
1327 make_exec_cleanup (delete_breakpoint_current_contents
,
1328 &through_sigtramp_breakpoint
);
1330 /* Fill in with reasonable starting values. */
1331 init_execution_control_state (async_ecs
);
1333 thread_step_needed
= 0;
1335 /* We'll update this if & when we switch to a new thread. */
1336 previous_inferior_pid
= inferior_pid
;
1338 overlay_cache_invalid
= 1;
1340 /* We have to invalidate the registers BEFORE calling target_wait
1341 because they can be loaded from the target while in target_wait.
1342 This makes remote debugging a bit more efficient for those
1343 targets that provide critical registers as part of their normal
1344 status mechanism. */
1346 registers_changed ();
1349 if (target_wait_hook
)
1350 async_ecs
->pid
= target_wait_hook (async_ecs
->waiton_pid
, async_ecs
->wp
);
1352 async_ecs
->pid
= target_wait (async_ecs
->waiton_pid
, async_ecs
->wp
);
1354 /* Now figure out what to do with the result of the result. */
1355 handle_inferior_event (async_ecs
);
1357 if (!async_ecs
->wait_some_more
)
1359 /* Do only the cleanups that have been added by this
1360 function. Let the continuations for the commands do the rest,
1361 if there are any. */
1362 do_exec_cleanups (old_cleanups
);
1364 if (step_multi
&& stop_step
)
1365 inferior_event_handler (INF_EXEC_CONTINUE
, NULL
);
1367 inferior_event_handler (INF_EXEC_COMPLETE
, NULL
);
1371 /* Prepare an execution control state for looping through a
1372 wait_for_inferior-type loop. */
1375 init_execution_control_state (struct execution_control_state
*ecs
)
1377 /* ecs->another_trap? */
1378 ecs
->random_signal
= 0;
1379 ecs
->remove_breakpoints_on_following_step
= 0;
1380 ecs
->handling_longjmp
= 0; /* FIXME */
1381 ecs
->update_step_sp
= 0;
1382 ecs
->stepping_through_solib_after_catch
= 0;
1383 ecs
->stepping_through_solib_catchpoints
= NULL
;
1384 ecs
->enable_hw_watchpoints_after_wait
= 0;
1385 ecs
->stepping_through_sigtramp
= 0;
1386 ecs
->sal
= find_pc_line (prev_pc
, 0);
1387 ecs
->current_line
= ecs
->sal
.line
;
1388 ecs
->current_symtab
= ecs
->sal
.symtab
;
1389 ecs
->infwait_state
= infwait_normal_state
;
1390 ecs
->waiton_pid
= -1;
1391 ecs
->wp
= &(ecs
->ws
);
1394 /* Call this function before setting step_resume_breakpoint, as a
1395 sanity check. There should never be more than one step-resume
1396 breakpoint per thread, so we should never be setting a new
1397 step_resume_breakpoint when one is already active. */
1399 check_for_old_step_resume_breakpoint (void)
1401 if (step_resume_breakpoint
)
1402 warning ("GDB bug: infrun.c (wait_for_inferior): dropping old step_resume breakpoint");
1405 /* Given an execution control state that has been freshly filled in
1406 by an event from the inferior, figure out what it means and take
1407 appropriate action. */
1410 handle_inferior_event (struct execution_control_state
*ecs
)
1413 int stepped_after_stopped_by_watchpoint
;
1415 /* Keep this extra brace for now, minimizes diffs. */
1417 switch (ecs
->infwait_state
)
1419 case infwait_normal_state
:
1420 /* Since we've done a wait, we have a new event. Don't
1421 carry over any expectations about needing to step over a
1423 thread_step_needed
= 0;
1425 /* See comments where a TARGET_WAITKIND_SYSCALL_RETURN event
1426 is serviced in this loop, below. */
1427 if (ecs
->enable_hw_watchpoints_after_wait
)
1429 TARGET_ENABLE_HW_WATCHPOINTS (inferior_pid
);
1430 ecs
->enable_hw_watchpoints_after_wait
= 0;
1432 stepped_after_stopped_by_watchpoint
= 0;
1435 case infwait_thread_hop_state
:
1436 insert_breakpoints ();
1438 /* We need to restart all the threads now,
1439 * unless we're running in scheduler-locked mode.
1440 * FIXME: shouldn't we look at currently_stepping ()?
1442 if (scheduler_mode
== schedlock_on
)
1443 target_resume (ecs
->pid
, 0, TARGET_SIGNAL_0
);
1445 target_resume (-1, 0, TARGET_SIGNAL_0
);
1446 ecs
->infwait_state
= infwait_normal_state
;
1447 prepare_to_wait (ecs
);
1450 case infwait_nullified_state
:
1453 case infwait_nonstep_watch_state
:
1454 insert_breakpoints ();
1456 /* FIXME-maybe: is this cleaner than setting a flag? Does it
1457 handle things like signals arriving and other things happening
1458 in combination correctly? */
1459 stepped_after_stopped_by_watchpoint
= 1;
1462 ecs
->infwait_state
= infwait_normal_state
;
1464 flush_cached_frames ();
1466 /* If it's a new process, add it to the thread database */
1468 ecs
->new_thread_event
= ((ecs
->pid
!= inferior_pid
) && !in_thread_list (ecs
->pid
));
1470 if (ecs
->ws
.kind
!= TARGET_WAITKIND_EXITED
1471 && ecs
->ws
.kind
!= TARGET_WAITKIND_SIGNALLED
1472 && ecs
->new_thread_event
)
1474 add_thread (ecs
->pid
);
1477 ui_out_text (uiout
, "[New ");
1478 ui_out_text (uiout
, target_pid_or_tid_to_str (ecs
->pid
));
1479 ui_out_text (uiout
, "]\n");
1481 printf_filtered ("[New %s]\n", target_pid_or_tid_to_str (ecs
->pid
));
1485 /* NOTE: This block is ONLY meant to be invoked in case of a
1486 "thread creation event"! If it is invoked for any other
1487 sort of event (such as a new thread landing on a breakpoint),
1488 the event will be discarded, which is almost certainly
1491 To avoid this, the low-level module (eg. target_wait)
1492 should call in_thread_list and add_thread, so that the
1493 new thread is known by the time we get here. */
1495 /* We may want to consider not doing a resume here in order
1496 to give the user a chance to play with the new thread.
1497 It might be good to make that a user-settable option. */
1499 /* At this point, all threads are stopped (happens
1500 automatically in either the OS or the native code).
1501 Therefore we need to continue all threads in order to
1504 target_resume (-1, 0, TARGET_SIGNAL_0
);
1505 prepare_to_wait (ecs
);
1510 switch (ecs
->ws
.kind
)
1512 case TARGET_WAITKIND_LOADED
:
1513 /* Ignore gracefully during startup of the inferior, as it
1514 might be the shell which has just loaded some objects,
1515 otherwise add the symbols for the newly loaded objects. */
1517 if (!stop_soon_quietly
)
1519 /* Remove breakpoints, SOLIB_ADD might adjust
1520 breakpoint addresses via breakpoint_re_set. */
1521 if (breakpoints_inserted
)
1522 remove_breakpoints ();
1524 /* Check for any newly added shared libraries if we're
1525 supposed to be adding them automatically. */
1528 /* Switch terminal for any messages produced by
1529 breakpoint_re_set. */
1530 target_terminal_ours_for_output ();
1531 SOLIB_ADD (NULL
, 0, NULL
);
1532 target_terminal_inferior ();
1535 /* Reinsert breakpoints and continue. */
1536 if (breakpoints_inserted
)
1537 insert_breakpoints ();
1540 resume (0, TARGET_SIGNAL_0
);
1541 prepare_to_wait (ecs
);
1544 case TARGET_WAITKIND_SPURIOUS
:
1545 resume (0, TARGET_SIGNAL_0
);
1546 prepare_to_wait (ecs
);
1549 case TARGET_WAITKIND_EXITED
:
1550 target_terminal_ours (); /* Must do this before mourn anyway */
1551 print_stop_reason (EXITED
, ecs
->ws
.value
.integer
);
1553 /* Record the exit code in the convenience variable $_exitcode, so
1554 that the user can inspect this again later. */
1555 set_internalvar (lookup_internalvar ("_exitcode"),
1556 value_from_longest (builtin_type_int
,
1557 (LONGEST
) ecs
->ws
.value
.integer
));
1558 gdb_flush (gdb_stdout
);
1559 target_mourn_inferior ();
1560 singlestep_breakpoints_inserted_p
= 0; /*SOFTWARE_SINGLE_STEP_P */
1561 stop_print_frame
= 0;
1562 stop_stepping (ecs
);
1565 case TARGET_WAITKIND_SIGNALLED
:
1566 stop_print_frame
= 0;
1567 stop_signal
= ecs
->ws
.value
.sig
;
1568 target_terminal_ours (); /* Must do this before mourn anyway */
1570 /* Note: By definition of TARGET_WAITKIND_SIGNALLED, we shouldn't
1571 reach here unless the inferior is dead. However, for years
1572 target_kill() was called here, which hints that fatal signals aren't
1573 really fatal on some systems. If that's true, then some changes
1575 target_mourn_inferior ();
1577 print_stop_reason (SIGNAL_EXITED
, stop_signal
);
1578 singlestep_breakpoints_inserted_p
= 0; /*SOFTWARE_SINGLE_STEP_P */
1579 stop_stepping (ecs
);
1582 /* The following are the only cases in which we keep going;
1583 the above cases end in a continue or goto. */
1584 case TARGET_WAITKIND_FORKED
:
1585 stop_signal
= TARGET_SIGNAL_TRAP
;
1586 pending_follow
.kind
= ecs
->ws
.kind
;
1588 /* Ignore fork events reported for the parent; we're only
1589 interested in reacting to forks of the child. Note that
1590 we expect the child's fork event to be available if we
1591 waited for it now. */
1592 if (inferior_pid
== ecs
->pid
)
1594 pending_follow
.fork_event
.saw_parent_fork
= 1;
1595 pending_follow
.fork_event
.parent_pid
= ecs
->pid
;
1596 pending_follow
.fork_event
.child_pid
= ecs
->ws
.value
.related_pid
;
1597 prepare_to_wait (ecs
);
1602 pending_follow
.fork_event
.saw_child_fork
= 1;
1603 pending_follow
.fork_event
.child_pid
= ecs
->pid
;
1604 pending_follow
.fork_event
.parent_pid
= ecs
->ws
.value
.related_pid
;
1607 stop_pc
= read_pc_pid (ecs
->pid
);
1608 ecs
->saved_inferior_pid
= inferior_pid
;
1609 inferior_pid
= ecs
->pid
;
1610 stop_bpstat
= bpstat_stop_status (&stop_pc
, currently_stepping (ecs
));
1611 ecs
->random_signal
= !bpstat_explains_signal (stop_bpstat
);
1612 inferior_pid
= ecs
->saved_inferior_pid
;
1613 goto process_event_stop_test
;
1615 /* If this a platform which doesn't allow a debugger to touch a
1616 vfork'd inferior until after it exec's, then we'd best keep
1617 our fingers entirely off the inferior, other than continuing
1618 it. This has the unfortunate side-effect that catchpoints
1619 of vforks will be ignored. But since the platform doesn't
1620 allow the inferior be touched at vfork time, there's really
1622 case TARGET_WAITKIND_VFORKED
:
1623 stop_signal
= TARGET_SIGNAL_TRAP
;
1624 pending_follow
.kind
= ecs
->ws
.kind
;
1626 /* Is this a vfork of the parent? If so, then give any
1627 vfork catchpoints a chance to trigger now. (It's
1628 dangerous to do so if the child canot be touched until
1629 it execs, and the child has not yet exec'd. We probably
1630 should warn the user to that effect when the catchpoint
1632 if (ecs
->pid
== inferior_pid
)
1634 pending_follow
.fork_event
.saw_parent_fork
= 1;
1635 pending_follow
.fork_event
.parent_pid
= ecs
->pid
;
1636 pending_follow
.fork_event
.child_pid
= ecs
->ws
.value
.related_pid
;
1639 /* If we've seen the child's vfork event but cannot really touch
1640 the child until it execs, then we must continue the child now.
1641 Else, give any vfork catchpoints a chance to trigger now. */
1644 pending_follow
.fork_event
.saw_child_fork
= 1;
1645 pending_follow
.fork_event
.child_pid
= ecs
->pid
;
1646 pending_follow
.fork_event
.parent_pid
= ecs
->ws
.value
.related_pid
;
1647 target_post_startup_inferior (pending_follow
.fork_event
.child_pid
);
1648 follow_vfork_when_exec
= !target_can_follow_vfork_prior_to_exec ();
1649 if (follow_vfork_when_exec
)
1651 target_resume (ecs
->pid
, 0, TARGET_SIGNAL_0
);
1652 prepare_to_wait (ecs
);
1657 stop_pc
= read_pc ();
1658 stop_bpstat
= bpstat_stop_status (&stop_pc
, currently_stepping (ecs
));
1659 ecs
->random_signal
= !bpstat_explains_signal (stop_bpstat
);
1660 goto process_event_stop_test
;
1662 case TARGET_WAITKIND_EXECD
:
1663 stop_signal
= TARGET_SIGNAL_TRAP
;
1665 /* Is this a target which reports multiple exec events per actual
1666 call to exec()? (HP-UX using ptrace does, for example.) If so,
1667 ignore all but the last one. Just resume the exec'r, and wait
1668 for the next exec event. */
1669 if (inferior_ignoring_leading_exec_events
)
1671 inferior_ignoring_leading_exec_events
--;
1672 if (pending_follow
.kind
== TARGET_WAITKIND_VFORKED
)
1673 ENSURE_VFORKING_PARENT_REMAINS_STOPPED (pending_follow
.fork_event
.parent_pid
);
1674 target_resume (ecs
->pid
, 0, TARGET_SIGNAL_0
);
1675 prepare_to_wait (ecs
);
1678 inferior_ignoring_leading_exec_events
=
1679 target_reported_exec_events_per_exec_call () - 1;
1681 pending_follow
.execd_pathname
=
1682 savestring (ecs
->ws
.value
.execd_pathname
,
1683 strlen (ecs
->ws
.value
.execd_pathname
));
1685 /* Did inferior_pid exec, or did a (possibly not-yet-followed)
1686 child of a vfork exec?
1688 ??rehrauer: This is unabashedly an HP-UX specific thing. On
1689 HP-UX, events associated with a vforking inferior come in
1690 threes: a vfork event for the child (always first), followed
1691 a vfork event for the parent and an exec event for the child.
1692 The latter two can come in either order.
1694 If we get the parent vfork event first, life's good: We follow
1695 either the parent or child, and then the child's exec event is
1698 But if we get the child's exec event first, then we delay
1699 responding to it until we handle the parent's vfork. Because,
1700 otherwise we can't satisfy a "catch vfork". */
1701 if (pending_follow
.kind
== TARGET_WAITKIND_VFORKED
)
1703 pending_follow
.fork_event
.saw_child_exec
= 1;
1705 /* On some targets, the child must be resumed before
1706 the parent vfork event is delivered. A single-step
1708 if (RESUME_EXECD_VFORKING_CHILD_TO_GET_PARENT_VFORK ())
1709 target_resume (ecs
->pid
, 1, TARGET_SIGNAL_0
);
1710 /* We expect the parent vfork event to be available now. */
1711 prepare_to_wait (ecs
);
1715 /* This causes the eventpoints and symbol table to be reset. Must
1716 do this now, before trying to determine whether to stop. */
1717 follow_exec (inferior_pid
, pending_follow
.execd_pathname
);
1718 free (pending_follow
.execd_pathname
);
1720 stop_pc
= read_pc_pid (ecs
->pid
);
1721 ecs
->saved_inferior_pid
= inferior_pid
;
1722 inferior_pid
= ecs
->pid
;
1723 stop_bpstat
= bpstat_stop_status (&stop_pc
, currently_stepping (ecs
));
1724 ecs
->random_signal
= !bpstat_explains_signal (stop_bpstat
);
1725 inferior_pid
= ecs
->saved_inferior_pid
;
1726 goto process_event_stop_test
;
1728 /* These syscall events are returned on HP-UX, as part of its
1729 implementation of page-protection-based "hardware" watchpoints.
1730 HP-UX has unfortunate interactions between page-protections and
1731 some system calls. Our solution is to disable hardware watches
1732 when a system call is entered, and reenable them when the syscall
1733 completes. The downside of this is that we may miss the precise
1734 point at which a watched piece of memory is modified. "Oh well."
1736 Note that we may have multiple threads running, which may each
1737 enter syscalls at roughly the same time. Since we don't have a
1738 good notion currently of whether a watched piece of memory is
1739 thread-private, we'd best not have any page-protections active
1740 when any thread is in a syscall. Thus, we only want to reenable
1741 hardware watches when no threads are in a syscall.
1743 Also, be careful not to try to gather much state about a thread
1744 that's in a syscall. It's frequently a losing proposition. */
1745 case TARGET_WAITKIND_SYSCALL_ENTRY
:
1746 number_of_threads_in_syscalls
++;
1747 if (number_of_threads_in_syscalls
== 1)
1749 TARGET_DISABLE_HW_WATCHPOINTS (inferior_pid
);
1751 resume (0, TARGET_SIGNAL_0
);
1752 prepare_to_wait (ecs
);
1755 /* Before examining the threads further, step this thread to
1756 get it entirely out of the syscall. (We get notice of the
1757 event when the thread is just on the verge of exiting a
1758 syscall. Stepping one instruction seems to get it back
1761 Note that although the logical place to reenable h/w watches
1762 is here, we cannot. We cannot reenable them before stepping
1763 the thread (this causes the next wait on the thread to hang).
1765 Nor can we enable them after stepping until we've done a wait.
1766 Thus, we simply set the flag ecs->enable_hw_watchpoints_after_wait
1767 here, which will be serviced immediately after the target
1769 case TARGET_WAITKIND_SYSCALL_RETURN
:
1770 target_resume (ecs
->pid
, 1, TARGET_SIGNAL_0
);
1772 if (number_of_threads_in_syscalls
> 0)
1774 number_of_threads_in_syscalls
--;
1775 ecs
->enable_hw_watchpoints_after_wait
=
1776 (number_of_threads_in_syscalls
== 0);
1778 prepare_to_wait (ecs
);
1781 case TARGET_WAITKIND_STOPPED
:
1782 stop_signal
= ecs
->ws
.value
.sig
;
1785 /* We had an event in the inferior, but we are not interested
1786 in handling it at this level. The lower layers have already
1787 done what needs to be done, if anything. This case can
1788 occur only when the target is async or extended-async. One
1789 of the circumstamces for this to happen is when the
1790 inferior produces output for the console. The inferior has
1791 not stopped, and we are ignoring the event. */
1792 case TARGET_WAITKIND_IGNORE
:
1793 ecs
->wait_some_more
= 1;
1797 /* We may want to consider not doing a resume here in order to give
1798 the user a chance to play with the new thread. It might be good
1799 to make that a user-settable option. */
1801 /* At this point, all threads are stopped (happens automatically in
1802 either the OS or the native code). Therefore we need to continue
1803 all threads in order to make progress. */
1804 if (ecs
->new_thread_event
)
1806 target_resume (-1, 0, TARGET_SIGNAL_0
);
1807 prepare_to_wait (ecs
);
1811 stop_pc
= read_pc_pid (ecs
->pid
);
1813 /* See if a thread hit a thread-specific breakpoint that was meant for
1814 another thread. If so, then step that thread past the breakpoint,
1817 if (stop_signal
== TARGET_SIGNAL_TRAP
)
1819 if (SOFTWARE_SINGLE_STEP_P
&& singlestep_breakpoints_inserted_p
)
1820 ecs
->random_signal
= 0;
1821 else if (breakpoints_inserted
1822 && breakpoint_here_p (stop_pc
- DECR_PC_AFTER_BREAK
))
1824 ecs
->random_signal
= 0;
1825 if (!breakpoint_thread_match (stop_pc
- DECR_PC_AFTER_BREAK
,
1830 /* Saw a breakpoint, but it was hit by the wrong thread.
1832 write_pc_pid (stop_pc
- DECR_PC_AFTER_BREAK
, ecs
->pid
);
1834 remove_status
= remove_breakpoints ();
1835 /* Did we fail to remove breakpoints? If so, try
1836 to set the PC past the bp. (There's at least
1837 one situation in which we can fail to remove
1838 the bp's: On HP-UX's that use ttrace, we can't
1839 change the address space of a vforking child
1840 process until the child exits (well, okay, not
1841 then either :-) or execs. */
1842 if (remove_status
!= 0)
1844 write_pc_pid (stop_pc
- DECR_PC_AFTER_BREAK
+ 4, ecs
->pid
);
1848 target_resume (ecs
->pid
, 1, TARGET_SIGNAL_0
);
1849 /* FIXME: What if a signal arrives instead of the
1850 single-step happening? */
1852 ecs
->waiton_pid
= ecs
->pid
;
1853 ecs
->wp
= &(ecs
->ws
);
1854 ecs
->infwait_state
= infwait_thread_hop_state
;
1855 prepare_to_wait (ecs
);
1859 /* We need to restart all the threads now,
1860 * unles we're running in scheduler-locked mode.
1861 * FIXME: shouldn't we look at currently_stepping ()?
1863 if (scheduler_mode
== schedlock_on
)
1864 target_resume (ecs
->pid
, 0, TARGET_SIGNAL_0
);
1866 target_resume (-1, 0, TARGET_SIGNAL_0
);
1867 prepare_to_wait (ecs
);
1872 /* This breakpoint matches--either it is the right
1873 thread or it's a generic breakpoint for all threads.
1874 Remember that we'll need to step just _this_ thread
1875 on any following user continuation! */
1876 thread_step_needed
= 1;
1881 ecs
->random_signal
= 1;
1883 /* See if something interesting happened to the non-current thread. If
1884 so, then switch to that thread, and eventually give control back to
1887 Note that if there's any kind of pending follow (i.e., of a fork,
1888 vfork or exec), we don't want to do this now. Rather, we'll let
1889 the next resume handle it. */
1890 if ((ecs
->pid
!= inferior_pid
) &&
1891 (pending_follow
.kind
== TARGET_WAITKIND_SPURIOUS
))
1895 /* If it's a random signal for a non-current thread, notify user
1896 if he's expressed an interest. */
1897 if (ecs
->random_signal
1898 && signal_print
[stop_signal
])
1900 /* ??rehrauer: I don't understand the rationale for this code. If the
1901 inferior will stop as a result of this signal, then the act of handling
1902 the stop ought to print a message that's couches the stoppage in user
1903 terms, e.g., "Stopped for breakpoint/watchpoint". If the inferior
1904 won't stop as a result of the signal -- i.e., if the signal is merely
1905 a side-effect of something GDB's doing "under the covers" for the
1906 user, such as stepping threads over a breakpoint they shouldn't stop
1907 for -- then the message seems to be a serious annoyance at best.
1909 For now, remove the message altogether. */
1912 target_terminal_ours_for_output ();
1913 printf_filtered ("\nProgram received signal %s, %s.\n",
1914 target_signal_to_name (stop_signal
),
1915 target_signal_to_string (stop_signal
));
1916 gdb_flush (gdb_stdout
);
1920 /* If it's not SIGTRAP and not a signal we want to stop for, then
1921 continue the thread. */
1923 if (stop_signal
!= TARGET_SIGNAL_TRAP
1924 && !signal_stop
[stop_signal
])
1927 target_terminal_inferior ();
1929 /* Clear the signal if it should not be passed. */
1930 if (signal_program
[stop_signal
] == 0)
1931 stop_signal
= TARGET_SIGNAL_0
;
1933 target_resume (ecs
->pid
, 0, stop_signal
);
1934 prepare_to_wait (ecs
);
1938 /* It's a SIGTRAP or a signal we're interested in. Switch threads,
1939 and fall into the rest of wait_for_inferior(). */
1941 /* Caution: it may happen that the new thread (or the old one!)
1942 is not in the thread list. In this case we must not attempt
1943 to "switch context", or we run the risk that our context may
1944 be lost. This may happen as a result of the target module
1945 mishandling thread creation. */
1947 if (in_thread_list (inferior_pid
) && in_thread_list (ecs
->pid
))
1948 { /* Perform infrun state context switch: */
1949 /* Save infrun state for the old thread. */
1950 save_infrun_state (inferior_pid
, prev_pc
,
1951 prev_func_start
, prev_func_name
,
1952 trap_expected
, step_resume_breakpoint
,
1953 through_sigtramp_breakpoint
,
1954 step_range_start
, step_range_end
,
1955 step_frame_address
, ecs
->handling_longjmp
,
1957 ecs
->stepping_through_solib_after_catch
,
1958 ecs
->stepping_through_solib_catchpoints
,
1959 ecs
->stepping_through_sigtramp
);
1961 /* Load infrun state for the new thread. */
1962 load_infrun_state (ecs
->pid
, &prev_pc
,
1963 &prev_func_start
, &prev_func_name
,
1964 &trap_expected
, &step_resume_breakpoint
,
1965 &through_sigtramp_breakpoint
,
1966 &step_range_start
, &step_range_end
,
1967 &step_frame_address
, &ecs
->handling_longjmp
,
1969 &ecs
->stepping_through_solib_after_catch
,
1970 &ecs
->stepping_through_solib_catchpoints
,
1971 &ecs
->stepping_through_sigtramp
);
1974 inferior_pid
= ecs
->pid
;
1977 context_hook (pid_to_thread_id (ecs
->pid
));
1979 flush_cached_frames ();
1982 if (SOFTWARE_SINGLE_STEP_P
&& singlestep_breakpoints_inserted_p
)
1984 /* Pull the single step breakpoints out of the target. */
1985 SOFTWARE_SINGLE_STEP (0, 0);
1986 singlestep_breakpoints_inserted_p
= 0;
1989 /* If PC is pointing at a nullified instruction, then step beyond
1990 it so that the user won't be confused when GDB appears to be ready
1993 /* if (INSTRUCTION_NULLIFIED && currently_stepping (ecs)) */
1994 if (INSTRUCTION_NULLIFIED
)
1996 registers_changed ();
1997 target_resume (ecs
->pid
, 1, TARGET_SIGNAL_0
);
1999 /* We may have received a signal that we want to pass to
2000 the inferior; therefore, we must not clobber the waitstatus
2003 ecs
->infwait_state
= infwait_nullified_state
;
2004 ecs
->waiton_pid
= ecs
->pid
;
2005 ecs
->wp
= &(ecs
->tmpstatus
);
2006 prepare_to_wait (ecs
);
2010 /* It may not be necessary to disable the watchpoint to stop over
2011 it. For example, the PA can (with some kernel cooperation)
2012 single step over a watchpoint without disabling the watchpoint. */
2013 if (HAVE_STEPPABLE_WATCHPOINT
&& STOPPED_BY_WATCHPOINT (ecs
->ws
))
2016 prepare_to_wait (ecs
);
2020 /* It is far more common to need to disable a watchpoint to step
2021 the inferior over it. FIXME. What else might a debug
2022 register or page protection watchpoint scheme need here? */
2023 if (HAVE_NONSTEPPABLE_WATCHPOINT
&& STOPPED_BY_WATCHPOINT (ecs
->ws
))
2025 /* At this point, we are stopped at an instruction which has
2026 attempted to write to a piece of memory under control of
2027 a watchpoint. The instruction hasn't actually executed
2028 yet. If we were to evaluate the watchpoint expression
2029 now, we would get the old value, and therefore no change
2030 would seem to have occurred.
2032 In order to make watchpoints work `right', we really need
2033 to complete the memory write, and then evaluate the
2034 watchpoint expression. The following code does that by
2035 removing the watchpoint (actually, all watchpoints and
2036 breakpoints), single-stepping the target, re-inserting
2037 watchpoints, and then falling through to let normal
2038 single-step processing handle proceed. Since this
2039 includes evaluating watchpoints, things will come to a
2040 stop in the correct manner. */
2042 write_pc (stop_pc
- DECR_PC_AFTER_BREAK
);
2044 remove_breakpoints ();
2045 registers_changed ();
2046 target_resume (ecs
->pid
, 1, TARGET_SIGNAL_0
); /* Single step */
2048 ecs
->waiton_pid
= ecs
->pid
;
2049 ecs
->wp
= &(ecs
->ws
);
2050 ecs
->infwait_state
= infwait_nonstep_watch_state
;
2051 prepare_to_wait (ecs
);
2055 /* It may be possible to simply continue after a watchpoint. */
2056 if (HAVE_CONTINUABLE_WATCHPOINT
)
2057 STOPPED_BY_WATCHPOINT (ecs
->ws
);
2059 ecs
->stop_func_start
= 0;
2060 ecs
->stop_func_end
= 0;
2061 ecs
->stop_func_name
= 0;
2062 /* Don't care about return value; stop_func_start and stop_func_name
2063 will both be 0 if it doesn't work. */
2064 find_pc_partial_function (stop_pc
, &ecs
->stop_func_name
,
2065 &ecs
->stop_func_start
, &ecs
->stop_func_end
);
2066 ecs
->stop_func_start
+= FUNCTION_START_OFFSET
;
2067 ecs
->another_trap
= 0;
2068 bpstat_clear (&stop_bpstat
);
2070 stop_stack_dummy
= 0;
2071 stop_print_frame
= 1;
2072 ecs
->random_signal
= 0;
2073 stopped_by_random_signal
= 0;
2074 breakpoints_failed
= 0;
2076 /* Look at the cause of the stop, and decide what to do.
2077 The alternatives are:
2078 1) break; to really stop and return to the debugger,
2079 2) drop through to start up again
2080 (set ecs->another_trap to 1 to single step once)
2081 3) set ecs->random_signal to 1, and the decision between 1 and 2
2082 will be made according to the signal handling tables. */
2084 /* First, distinguish signals caused by the debugger from signals
2085 that have to do with the program's own actions.
2086 Note that breakpoint insns may cause SIGTRAP or SIGILL
2087 or SIGEMT, depending on the operating system version.
2088 Here we detect when a SIGILL or SIGEMT is really a breakpoint
2089 and change it to SIGTRAP. */
2091 if (stop_signal
== TARGET_SIGNAL_TRAP
2092 || (breakpoints_inserted
&&
2093 (stop_signal
== TARGET_SIGNAL_ILL
2094 || stop_signal
== TARGET_SIGNAL_EMT
2096 || stop_soon_quietly
)
2098 if (stop_signal
== TARGET_SIGNAL_TRAP
&& stop_after_trap
)
2100 stop_print_frame
= 0;
2101 stop_stepping (ecs
);
2104 if (stop_soon_quietly
)
2106 stop_stepping (ecs
);
2110 /* Don't even think about breakpoints
2111 if just proceeded over a breakpoint.
2113 However, if we are trying to proceed over a breakpoint
2114 and end up in sigtramp, then through_sigtramp_breakpoint
2115 will be set and we should check whether we've hit the
2117 if (stop_signal
== TARGET_SIGNAL_TRAP
&& trap_expected
2118 && through_sigtramp_breakpoint
== NULL
)
2119 bpstat_clear (&stop_bpstat
);
2122 /* See if there is a breakpoint at the current PC. */
2123 stop_bpstat
= bpstat_stop_status
2125 /* Pass TRUE if our reason for stopping is something other
2126 than hitting a breakpoint. We do this by checking that
2127 1) stepping is going on and 2) we didn't hit a breakpoint
2128 in a signal handler without an intervening stop in
2129 sigtramp, which is detected by a new stack pointer value
2130 below any usual function calling stack adjustments. */
2131 (currently_stepping (ecs
)
2133 && INNER_THAN (read_sp (), (step_sp
- 16))))
2135 /* Following in case break condition called a
2137 stop_print_frame
= 1;
2140 if (stop_signal
== TARGET_SIGNAL_TRAP
)
2142 = !(bpstat_explains_signal (stop_bpstat
)
2144 || (!CALL_DUMMY_BREAKPOINT_OFFSET_P
2145 && PC_IN_CALL_DUMMY (stop_pc
, read_sp (),
2146 FRAME_FP (get_current_frame ())))
2147 || (step_range_end
&& step_resume_breakpoint
== NULL
));
2152 = !(bpstat_explains_signal (stop_bpstat
)
2153 /* End of a stack dummy. Some systems (e.g. Sony
2154 news) give another signal besides SIGTRAP, so
2155 check here as well as above. */
2156 || (!CALL_DUMMY_BREAKPOINT_OFFSET_P
2157 && PC_IN_CALL_DUMMY (stop_pc
, read_sp (),
2158 FRAME_FP (get_current_frame ())))
2160 if (!ecs
->random_signal
)
2161 stop_signal
= TARGET_SIGNAL_TRAP
;
2165 /* When we reach this point, we've pretty much decided
2166 that the reason for stopping must've been a random
2167 (unexpected) signal. */
2170 ecs
->random_signal
= 1;
2171 /* If a fork, vfork or exec event was seen, then there are two
2172 possible responses we can make:
2174 1. If a catchpoint triggers for the event (ecs->random_signal == 0),
2175 then we must stop now and issue a prompt. We will resume
2176 the inferior when the user tells us to.
2177 2. If no catchpoint triggers for the event (ecs->random_signal == 1),
2178 then we must resume the inferior now and keep checking.
2180 In either case, we must take appropriate steps to "follow" the
2181 the fork/vfork/exec when the inferior is resumed. For example,
2182 if follow-fork-mode is "child", then we must detach from the
2183 parent inferior and follow the new child inferior.
2185 In either case, setting pending_follow causes the next resume()
2186 to take the appropriate following action. */
2187 process_event_stop_test
:
2188 if (ecs
->ws
.kind
== TARGET_WAITKIND_FORKED
)
2190 if (ecs
->random_signal
) /* I.e., no catchpoint triggered for this. */
2193 stop_signal
= TARGET_SIGNAL_0
;
2198 else if (ecs
->ws
.kind
== TARGET_WAITKIND_VFORKED
)
2200 if (ecs
->random_signal
) /* I.e., no catchpoint triggered for this. */
2202 stop_signal
= TARGET_SIGNAL_0
;
2207 else if (ecs
->ws
.kind
== TARGET_WAITKIND_EXECD
)
2209 pending_follow
.kind
= ecs
->ws
.kind
;
2210 if (ecs
->random_signal
) /* I.e., no catchpoint triggered for this. */
2213 stop_signal
= TARGET_SIGNAL_0
;
2219 /* For the program's own signals, act according to
2220 the signal handling tables. */
2222 if (ecs
->random_signal
)
2224 /* Signal not for debugging purposes. */
2227 stopped_by_random_signal
= 1;
2229 if (signal_print
[stop_signal
])
2232 target_terminal_ours_for_output ();
2233 print_stop_reason (SIGNAL_RECEIVED
, stop_signal
);
2235 if (signal_stop
[stop_signal
])
2237 stop_stepping (ecs
);
2240 /* If not going to stop, give terminal back
2241 if we took it away. */
2243 target_terminal_inferior ();
2245 /* Clear the signal if it should not be passed. */
2246 if (signal_program
[stop_signal
] == 0)
2247 stop_signal
= TARGET_SIGNAL_0
;
2249 /* I'm not sure whether this needs to be check_sigtramp2 or
2250 whether it could/should be keep_going.
2252 This used to jump to step_over_function if we are stepping,
2255 Suppose the user does a `next' over a function call, and while
2256 that call is in progress, the inferior receives a signal for
2257 which GDB does not stop (i.e., signal_stop[SIG] is false). In
2258 that case, when we reach this point, there is already a
2259 step-resume breakpoint established, right where it should be:
2260 immediately after the function call the user is "next"-ing
2261 over. If we call step_over_function now, two bad things
2264 - we'll create a new breakpoint, at wherever the current
2265 frame's return address happens to be. That could be
2266 anywhere, depending on what function call happens to be on
2267 the top of the stack at that point. Point is, it's probably
2268 not where we need it.
2270 - the existing step-resume breakpoint (which is at the correct
2271 address) will get orphaned: step_resume_breakpoint will point
2272 to the new breakpoint, and the old step-resume breakpoint
2273 will never be cleaned up.
2275 The old behavior was meant to help HP-UX single-step out of
2276 sigtramps. It would place the new breakpoint at prev_pc, which
2277 was certainly wrong. I don't know the details there, so fixing
2278 this probably breaks that. As with anything else, it's up to
2279 the HP-UX maintainer to furnish a fix that doesn't break other
2280 platforms. --JimB, 20 May 1999 */
2281 check_sigtramp2 (ecs
);
2286 /* Handle cases caused by hitting a breakpoint. */
2288 CORE_ADDR jmp_buf_pc
;
2289 struct bpstat_what what
;
2291 what
= bpstat_what (stop_bpstat
);
2293 if (what
.call_dummy
)
2295 stop_stack_dummy
= 1;
2297 trap_expected_after_continue
= 1;
2301 switch (what
.main_action
)
2303 case BPSTAT_WHAT_SET_LONGJMP_RESUME
:
2304 /* If we hit the breakpoint at longjmp, disable it for the
2305 duration of this command. Then, install a temporary
2306 breakpoint at the target of the jmp_buf. */
2307 disable_longjmp_breakpoint ();
2308 remove_breakpoints ();
2309 breakpoints_inserted
= 0;
2310 if (!GET_LONGJMP_TARGET (&jmp_buf_pc
))
2316 /* Need to blow away step-resume breakpoint, as it
2317 interferes with us */
2318 if (step_resume_breakpoint
!= NULL
)
2320 delete_breakpoint (step_resume_breakpoint
);
2321 step_resume_breakpoint
= NULL
;
2323 /* Not sure whether we need to blow this away too, but probably
2324 it is like the step-resume breakpoint. */
2325 if (through_sigtramp_breakpoint
!= NULL
)
2327 delete_breakpoint (through_sigtramp_breakpoint
);
2328 through_sigtramp_breakpoint
= NULL
;
2332 /* FIXME - Need to implement nested temporary breakpoints */
2333 if (step_over_calls
> 0)
2334 set_longjmp_resume_breakpoint (jmp_buf_pc
,
2335 get_current_frame ());
2338 set_longjmp_resume_breakpoint (jmp_buf_pc
, NULL
);
2339 ecs
->handling_longjmp
= 1; /* FIXME */
2343 case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME
:
2344 case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME_SINGLE
:
2345 remove_breakpoints ();
2346 breakpoints_inserted
= 0;
2348 /* FIXME - Need to implement nested temporary breakpoints */
2350 && (INNER_THAN (FRAME_FP (get_current_frame ()),
2351 step_frame_address
)))
2353 ecs
->another_trap
= 1;
2358 disable_longjmp_breakpoint ();
2359 ecs
->handling_longjmp
= 0; /* FIXME */
2360 if (what
.main_action
== BPSTAT_WHAT_CLEAR_LONGJMP_RESUME
)
2362 /* else fallthrough */
2364 case BPSTAT_WHAT_SINGLE
:
2365 if (breakpoints_inserted
)
2367 thread_step_needed
= 1;
2368 remove_breakpoints ();
2370 breakpoints_inserted
= 0;
2371 ecs
->another_trap
= 1;
2372 /* Still need to check other stuff, at least the case
2373 where we are stepping and step out of the right range. */
2376 case BPSTAT_WHAT_STOP_NOISY
:
2377 stop_print_frame
= 1;
2379 /* We are about to nuke the step_resume_breakpoint and
2380 through_sigtramp_breakpoint via the cleanup chain, so
2381 no need to worry about it here. */
2383 stop_stepping (ecs
);
2386 case BPSTAT_WHAT_STOP_SILENT
:
2387 stop_print_frame
= 0;
2389 /* We are about to nuke the step_resume_breakpoint and
2390 through_sigtramp_breakpoint via the cleanup chain, so
2391 no need to worry about it here. */
2393 stop_stepping (ecs
);
2396 case BPSTAT_WHAT_STEP_RESUME
:
2397 /* This proably demands a more elegant solution, but, yeah
2400 This function's use of the simple variable
2401 step_resume_breakpoint doesn't seem to accomodate
2402 simultaneously active step-resume bp's, although the
2403 breakpoint list certainly can.
2405 If we reach here and step_resume_breakpoint is already
2406 NULL, then apparently we have multiple active
2407 step-resume bp's. We'll just delete the breakpoint we
2408 stopped at, and carry on.
2410 Correction: what the code currently does is delete a
2411 step-resume bp, but it makes no effort to ensure that
2412 the one deleted is the one currently stopped at. MVS */
2414 if (step_resume_breakpoint
== NULL
)
2416 step_resume_breakpoint
=
2417 bpstat_find_step_resume_breakpoint (stop_bpstat
);
2419 delete_breakpoint (step_resume_breakpoint
);
2420 step_resume_breakpoint
= NULL
;
2423 case BPSTAT_WHAT_THROUGH_SIGTRAMP
:
2424 if (through_sigtramp_breakpoint
)
2425 delete_breakpoint (through_sigtramp_breakpoint
);
2426 through_sigtramp_breakpoint
= NULL
;
2428 /* If were waiting for a trap, hitting the step_resume_break
2429 doesn't count as getting it. */
2431 ecs
->another_trap
= 1;
2434 case BPSTAT_WHAT_CHECK_SHLIBS
:
2435 case BPSTAT_WHAT_CHECK_SHLIBS_RESUME_FROM_HOOK
:
2438 /* Remove breakpoints, we eventually want to step over the
2439 shlib event breakpoint, and SOLIB_ADD might adjust
2440 breakpoint addresses via breakpoint_re_set. */
2441 if (breakpoints_inserted
)
2442 remove_breakpoints ();
2443 breakpoints_inserted
= 0;
2445 /* Check for any newly added shared libraries if we're
2446 supposed to be adding them automatically. */
2449 /* Switch terminal for any messages produced by
2450 breakpoint_re_set. */
2451 target_terminal_ours_for_output ();
2452 SOLIB_ADD (NULL
, 0, NULL
);
2453 target_terminal_inferior ();
2456 /* Try to reenable shared library breakpoints, additional
2457 code segments in shared libraries might be mapped in now. */
2458 re_enable_breakpoints_in_shlibs ();
2460 /* If requested, stop when the dynamic linker notifies
2461 gdb of events. This allows the user to get control
2462 and place breakpoints in initializer routines for
2463 dynamically loaded objects (among other things). */
2464 if (stop_on_solib_events
)
2466 stop_stepping (ecs
);
2470 /* If we stopped due to an explicit catchpoint, then the
2471 (see above) call to SOLIB_ADD pulled in any symbols
2472 from a newly-loaded library, if appropriate.
2474 We do want the inferior to stop, but not where it is
2475 now, which is in the dynamic linker callback. Rather,
2476 we would like it stop in the user's program, just after
2477 the call that caused this catchpoint to trigger. That
2478 gives the user a more useful vantage from which to
2479 examine their program's state. */
2480 else if (what
.main_action
== BPSTAT_WHAT_CHECK_SHLIBS_RESUME_FROM_HOOK
)
2482 /* ??rehrauer: If I could figure out how to get the
2483 right return PC from here, we could just set a temp
2484 breakpoint and resume. I'm not sure we can without
2485 cracking open the dld's shared libraries and sniffing
2486 their unwind tables and text/data ranges, and that's
2487 not a terribly portable notion.
2489 Until that time, we must step the inferior out of the
2490 dld callback, and also out of the dld itself (and any
2491 code or stubs in libdld.sl, such as "shl_load" and
2492 friends) until we reach non-dld code. At that point,
2493 we can stop stepping. */
2494 bpstat_get_triggered_catchpoints (stop_bpstat
,
2495 &ecs
->stepping_through_solib_catchpoints
);
2496 ecs
->stepping_through_solib_after_catch
= 1;
2498 /* Be sure to lift all breakpoints, so the inferior does
2499 actually step past this point... */
2500 ecs
->another_trap
= 1;
2505 /* We want to step over this breakpoint, then keep going. */
2506 ecs
->another_trap
= 1;
2513 case BPSTAT_WHAT_LAST
:
2514 /* Not a real code, but listed here to shut up gcc -Wall. */
2516 case BPSTAT_WHAT_KEEP_CHECKING
:
2521 /* We come here if we hit a breakpoint but should not
2522 stop for it. Possibly we also were stepping
2523 and should stop for that. So fall through and
2524 test for stepping. But, if not stepping,
2527 /* Are we stepping to get the inferior out of the dynamic
2528 linker's hook (and possibly the dld itself) after catching
2530 if (ecs
->stepping_through_solib_after_catch
)
2532 #if defined(SOLIB_ADD)
2533 /* Have we reached our destination? If not, keep going. */
2534 if (SOLIB_IN_DYNAMIC_LINKER (ecs
->pid
, stop_pc
))
2536 ecs
->another_trap
= 1;
2541 /* Else, stop and report the catchpoint(s) whose triggering
2542 caused us to begin stepping. */
2543 ecs
->stepping_through_solib_after_catch
= 0;
2544 bpstat_clear (&stop_bpstat
);
2545 stop_bpstat
= bpstat_copy (ecs
->stepping_through_solib_catchpoints
);
2546 bpstat_clear (&ecs
->stepping_through_solib_catchpoints
);
2547 stop_print_frame
= 1;
2548 stop_stepping (ecs
);
2552 if (!CALL_DUMMY_BREAKPOINT_OFFSET_P
)
2554 /* This is the old way of detecting the end of the stack dummy.
2555 An architecture which defines CALL_DUMMY_BREAKPOINT_OFFSET gets
2556 handled above. As soon as we can test it on all of them, all
2557 architectures should define it. */
2559 /* If this is the breakpoint at the end of a stack dummy,
2560 just stop silently, unless the user was doing an si/ni, in which
2561 case she'd better know what she's doing. */
2563 if (CALL_DUMMY_HAS_COMPLETED (stop_pc
, read_sp (),
2564 FRAME_FP (get_current_frame ()))
2567 stop_print_frame
= 0;
2568 stop_stack_dummy
= 1;
2570 trap_expected_after_continue
= 1;
2572 stop_stepping (ecs
);
2577 if (step_resume_breakpoint
)
2579 /* Having a step-resume breakpoint overrides anything
2580 else having to do with stepping commands until
2581 that breakpoint is reached. */
2582 /* I'm not sure whether this needs to be check_sigtramp2 or
2583 whether it could/should be keep_going. */
2584 check_sigtramp2 (ecs
);
2589 if (step_range_end
== 0)
2591 /* Likewise if we aren't even stepping. */
2592 /* I'm not sure whether this needs to be check_sigtramp2 or
2593 whether it could/should be keep_going. */
2594 check_sigtramp2 (ecs
);
2599 /* If stepping through a line, keep going if still within it.
2601 Note that step_range_end is the address of the first instruction
2602 beyond the step range, and NOT the address of the last instruction
2604 if (stop_pc
>= step_range_start
2605 && stop_pc
< step_range_end
)
2607 /* We might be doing a BPSTAT_WHAT_SINGLE and getting a signal.
2608 So definately need to check for sigtramp here. */
2609 check_sigtramp2 (ecs
);
2614 /* We stepped out of the stepping range. */
2616 /* If we are stepping at the source level and entered the runtime
2617 loader dynamic symbol resolution code, we keep on single stepping
2618 until we exit the run time loader code and reach the callee's
2620 if (step_over_calls
== STEP_OVER_UNDEBUGGABLE
&& IN_SOLIB_DYNSYM_RESOLVE_CODE (stop_pc
))
2622 CORE_ADDR pc_after_resolver
= SKIP_SOLIB_RESOLVER (stop_pc
);
2624 if (pc_after_resolver
)
2626 /* Set up a step-resume breakpoint at the address
2627 indicated by SKIP_SOLIB_RESOLVER. */
2628 struct symtab_and_line sr_sal
;
2630 sr_sal
.pc
= pc_after_resolver
;
2632 check_for_old_step_resume_breakpoint ();
2633 step_resume_breakpoint
=
2634 set_momentary_breakpoint (sr_sal
, NULL
, bp_step_resume
);
2635 if (breakpoints_inserted
)
2636 insert_breakpoints ();
2643 /* We can't update step_sp every time through the loop, because
2644 reading the stack pointer would slow down stepping too much.
2645 But we can update it every time we leave the step range. */
2646 ecs
->update_step_sp
= 1;
2648 /* Did we just take a signal? */
2649 if (IN_SIGTRAMP (stop_pc
, ecs
->stop_func_name
)
2650 && !IN_SIGTRAMP (prev_pc
, prev_func_name
)
2651 && INNER_THAN (read_sp (), step_sp
))
2653 /* We've just taken a signal; go until we are back to
2654 the point where we took it and one more. */
2656 /* Note: The test above succeeds not only when we stepped
2657 into a signal handler, but also when we step past the last
2658 statement of a signal handler and end up in the return stub
2659 of the signal handler trampoline. To distinguish between
2660 these two cases, check that the frame is INNER_THAN the
2661 previous one below. pai/1997-09-11 */
2665 CORE_ADDR current_frame
= FRAME_FP (get_current_frame ());
2667 if (INNER_THAN (current_frame
, step_frame_address
))
2669 /* We have just taken a signal; go until we are back to
2670 the point where we took it and one more. */
2672 /* This code is needed at least in the following case:
2673 The user types "next" and then a signal arrives (before
2674 the "next" is done). */
2676 /* Note that if we are stopped at a breakpoint, then we need
2677 the step_resume breakpoint to override any breakpoints at
2678 the same location, so that we will still step over the
2679 breakpoint even though the signal happened. */
2680 struct symtab_and_line sr_sal
;
2683 sr_sal
.symtab
= NULL
;
2685 sr_sal
.pc
= prev_pc
;
2686 /* We could probably be setting the frame to
2687 step_frame_address; I don't think anyone thought to
2689 check_for_old_step_resume_breakpoint ();
2690 step_resume_breakpoint
=
2691 set_momentary_breakpoint (sr_sal
, NULL
, bp_step_resume
);
2692 if (breakpoints_inserted
)
2693 insert_breakpoints ();
2697 /* We just stepped out of a signal handler and into
2698 its calling trampoline.
2700 Normally, we'd call step_over_function from
2701 here, but for some reason GDB can't unwind the
2702 stack correctly to find the real PC for the point
2703 user code where the signal trampoline will return
2704 -- FRAME_SAVED_PC fails, at least on HP-UX 10.20.
2705 But signal trampolines are pretty small stubs of
2706 code, anyway, so it's OK instead to just
2707 single-step out. Note: assuming such trampolines
2708 don't exhibit recursion on any platform... */
2709 find_pc_partial_function (stop_pc
, &ecs
->stop_func_name
,
2710 &ecs
->stop_func_start
,
2711 &ecs
->stop_func_end
);
2712 /* Readjust stepping range */
2713 step_range_start
= ecs
->stop_func_start
;
2714 step_range_end
= ecs
->stop_func_end
;
2715 ecs
->stepping_through_sigtramp
= 1;
2720 /* If this is stepi or nexti, make sure that the stepping range
2721 gets us past that instruction. */
2722 if (step_range_end
== 1)
2723 /* FIXME: Does this run afoul of the code below which, if
2724 we step into the middle of a line, resets the stepping
2726 step_range_end
= (step_range_start
= prev_pc
) + 1;
2728 ecs
->remove_breakpoints_on_following_step
= 1;
2733 if (stop_pc
== ecs
->stop_func_start
/* Quick test */
2734 || (in_prologue (stop_pc
, ecs
->stop_func_start
) &&
2735 !IN_SOLIB_RETURN_TRAMPOLINE (stop_pc
, ecs
->stop_func_name
))
2736 || IN_SOLIB_CALL_TRAMPOLINE (stop_pc
, ecs
->stop_func_name
)
2737 || ecs
->stop_func_name
== 0)
2739 /* It's a subroutine call. */
2741 if (step_over_calls
== STEP_OVER_NONE
)
2743 /* I presume that step_over_calls is only 0 when we're
2744 supposed to be stepping at the assembly language level
2745 ("stepi"). Just stop. */
2747 print_stop_reason (END_STEPPING_RANGE
, 0);
2748 stop_stepping (ecs
);
2752 if (step_over_calls
== STEP_OVER_ALL
|| IGNORE_HELPER_CALL (stop_pc
))
2754 /* We're doing a "next". */
2756 if (IN_SIGTRAMP (stop_pc
, ecs
->stop_func_name
)
2757 && INNER_THAN (step_frame_address
, read_sp()))
2758 /* We stepped out of a signal handler, and into its
2759 calling trampoline. This is misdetected as a
2760 subroutine call, but stepping over the signal
2761 trampoline isn't such a bad idea. In order to do
2762 that, we have to ignore the value in
2763 step_frame_address, since that doesn't represent the
2764 frame that'll reach when we return from the signal
2765 trampoline. Otherwise we'll probably continue to the
2766 end of the program. */
2767 step_frame_address
= 0;
2769 step_over_function (ecs
);
2774 /* If we are in a function call trampoline (a stub between
2775 the calling routine and the real function), locate the real
2776 function. That's what tells us (a) whether we want to step
2777 into it at all, and (b) what prologue we want to run to
2778 the end of, if we do step into it. */
2779 tmp
= SKIP_TRAMPOLINE_CODE (stop_pc
);
2781 ecs
->stop_func_start
= tmp
;
2784 tmp
= DYNAMIC_TRAMPOLINE_NEXTPC (stop_pc
);
2787 struct symtab_and_line xxx
;
2788 /* Why isn't this s_a_l called "sr_sal", like all of the
2789 other s_a_l's where this code is duplicated? */
2790 INIT_SAL (&xxx
); /* initialize to zeroes */
2792 xxx
.section
= find_pc_overlay (xxx
.pc
);
2793 check_for_old_step_resume_breakpoint ();
2794 step_resume_breakpoint
=
2795 set_momentary_breakpoint (xxx
, NULL
, bp_step_resume
);
2796 insert_breakpoints ();
2802 /* If we have line number information for the function we
2803 are thinking of stepping into, step into it.
2805 If there are several symtabs at that PC (e.g. with include
2806 files), just want to know whether *any* of them have line
2807 numbers. find_pc_line handles this. */
2809 struct symtab_and_line tmp_sal
;
2811 tmp_sal
= find_pc_line (ecs
->stop_func_start
, 0);
2812 if (tmp_sal
.line
!= 0)
2814 step_into_function (ecs
);
2819 /* If we have no line number and the step-stop-if-no-debug
2820 is set, we stop the step so that the user has a chance to
2821 switch in assembly mode. */
2822 if (step_over_calls
== STEP_OVER_UNDEBUGGABLE
&& step_stop_if_no_debug
)
2825 print_stop_reason (END_STEPPING_RANGE
, 0);
2826 stop_stepping (ecs
);
2830 step_over_function (ecs
);
2836 /* We've wandered out of the step range. */
2838 ecs
->sal
= find_pc_line (stop_pc
, 0);
2840 if (step_range_end
== 1)
2842 /* It is stepi or nexti. We always want to stop stepping after
2845 print_stop_reason (END_STEPPING_RANGE
, 0);
2846 stop_stepping (ecs
);
2850 /* If we're in the return path from a shared library trampoline,
2851 we want to proceed through the trampoline when stepping. */
2852 if (IN_SOLIB_RETURN_TRAMPOLINE (stop_pc
, ecs
->stop_func_name
))
2856 /* Determine where this trampoline returns. */
2857 tmp
= SKIP_TRAMPOLINE_CODE (stop_pc
);
2859 /* Only proceed through if we know where it's going. */
2862 /* And put the step-breakpoint there and go until there. */
2863 struct symtab_and_line sr_sal
;
2865 INIT_SAL (&sr_sal
); /* initialize to zeroes */
2867 sr_sal
.section
= find_pc_overlay (sr_sal
.pc
);
2868 /* Do not specify what the fp should be when we stop
2869 since on some machines the prologue
2870 is where the new fp value is established. */
2871 check_for_old_step_resume_breakpoint ();
2872 step_resume_breakpoint
=
2873 set_momentary_breakpoint (sr_sal
, NULL
, bp_step_resume
);
2874 if (breakpoints_inserted
)
2875 insert_breakpoints ();
2877 /* Restart without fiddling with the step ranges or
2884 if (ecs
->sal
.line
== 0)
2886 /* We have no line number information. That means to stop
2887 stepping (does this always happen right after one instruction,
2888 when we do "s" in a function with no line numbers,
2889 or can this happen as a result of a return or longjmp?). */
2891 print_stop_reason (END_STEPPING_RANGE
, 0);
2892 stop_stepping (ecs
);
2896 if ((stop_pc
== ecs
->sal
.pc
)
2897 && (ecs
->current_line
!= ecs
->sal
.line
|| ecs
->current_symtab
!= ecs
->sal
.symtab
))
2899 /* We are at the start of a different line. So stop. Note that
2900 we don't stop if we step into the middle of a different line.
2901 That is said to make things like for (;;) statements work
2904 print_stop_reason (END_STEPPING_RANGE
, 0);
2905 stop_stepping (ecs
);
2909 /* We aren't done stepping.
2911 Optimize by setting the stepping range to the line.
2912 (We might not be in the original line, but if we entered a
2913 new line in mid-statement, we continue stepping. This makes
2914 things like for(;;) statements work better.) */
2916 if (ecs
->stop_func_end
&& ecs
->sal
.end
>= ecs
->stop_func_end
)
2918 /* If this is the last line of the function, don't keep stepping
2919 (it would probably step us out of the function).
2920 This is particularly necessary for a one-line function,
2921 in which after skipping the prologue we better stop even though
2922 we will be in mid-line. */
2924 print_stop_reason (END_STEPPING_RANGE
, 0);
2925 stop_stepping (ecs
);
2928 step_range_start
= ecs
->sal
.pc
;
2929 step_range_end
= ecs
->sal
.end
;
2930 step_frame_address
= FRAME_FP (get_current_frame ());
2931 ecs
->current_line
= ecs
->sal
.line
;
2932 ecs
->current_symtab
= ecs
->sal
.symtab
;
2934 /* In the case where we just stepped out of a function into the middle
2935 of a line of the caller, continue stepping, but step_frame_address
2936 must be modified to current frame */
2938 CORE_ADDR current_frame
= FRAME_FP (get_current_frame ());
2939 if (!(INNER_THAN (current_frame
, step_frame_address
)))
2940 step_frame_address
= current_frame
;
2945 } /* extra brace, to preserve old indentation */
2948 /* Are we in the middle of stepping? */
2951 currently_stepping (struct execution_control_state
*ecs
)
2953 return ((through_sigtramp_breakpoint
== NULL
2954 && !ecs
->handling_longjmp
2955 && ((step_range_end
&& step_resume_breakpoint
== NULL
)
2957 || ecs
->stepping_through_solib_after_catch
2958 || bpstat_should_step ());
2962 check_sigtramp2 (struct execution_control_state
*ecs
)
2965 && IN_SIGTRAMP (stop_pc
, ecs
->stop_func_name
)
2966 && !IN_SIGTRAMP (prev_pc
, prev_func_name
)
2967 && INNER_THAN (read_sp (), step_sp
))
2969 /* What has happened here is that we have just stepped the
2970 inferior with a signal (because it is a signal which
2971 shouldn't make us stop), thus stepping into sigtramp.
2973 So we need to set a step_resume_break_address breakpoint and
2974 continue until we hit it, and then step. FIXME: This should
2975 be more enduring than a step_resume breakpoint; we should
2976 know that we will later need to keep going rather than
2977 re-hitting the breakpoint here (see the testsuite,
2978 gdb.base/signals.exp where it says "exceedingly difficult"). */
2980 struct symtab_and_line sr_sal
;
2982 INIT_SAL (&sr_sal
); /* initialize to zeroes */
2983 sr_sal
.pc
= prev_pc
;
2984 sr_sal
.section
= find_pc_overlay (sr_sal
.pc
);
2985 /* We perhaps could set the frame if we kept track of what the
2986 frame corresponding to prev_pc was. But we don't, so don't. */
2987 through_sigtramp_breakpoint
=
2988 set_momentary_breakpoint (sr_sal
, NULL
, bp_through_sigtramp
);
2989 if (breakpoints_inserted
)
2990 insert_breakpoints ();
2992 ecs
->remove_breakpoints_on_following_step
= 1;
2993 ecs
->another_trap
= 1;
2997 /* Subroutine call with source code we should not step over. Do step
2998 to the first line of code in it. */
3001 step_into_function (struct execution_control_state
*ecs
)
3004 struct symtab_and_line sr_sal
;
3006 s
= find_pc_symtab (stop_pc
);
3007 if (s
&& s
->language
!= language_asm
)
3008 ecs
->stop_func_start
= SKIP_PROLOGUE (ecs
->stop_func_start
);
3010 ecs
->sal
= find_pc_line (ecs
->stop_func_start
, 0);
3011 /* Use the step_resume_break to step until the end of the prologue,
3012 even if that involves jumps (as it seems to on the vax under
3014 /* If the prologue ends in the middle of a source line, continue to
3015 the end of that source line (if it is still within the function).
3016 Otherwise, just go to end of prologue. */
3017 #ifdef PROLOGUE_FIRSTLINE_OVERLAP
3018 /* no, don't either. It skips any code that's legitimately on the
3022 && ecs
->sal
.pc
!= ecs
->stop_func_start
3023 && ecs
->sal
.end
< ecs
->stop_func_end
)
3024 ecs
->stop_func_start
= ecs
->sal
.end
;
3027 if (ecs
->stop_func_start
== stop_pc
)
3029 /* We are already there: stop now. */
3031 print_stop_reason (END_STEPPING_RANGE
, 0);
3032 stop_stepping (ecs
);
3037 /* Put the step-breakpoint there and go until there. */
3038 INIT_SAL (&sr_sal
); /* initialize to zeroes */
3039 sr_sal
.pc
= ecs
->stop_func_start
;
3040 sr_sal
.section
= find_pc_overlay (ecs
->stop_func_start
);
3041 /* Do not specify what the fp should be when we stop since on
3042 some machines the prologue is where the new fp value is
3044 check_for_old_step_resume_breakpoint ();
3045 step_resume_breakpoint
=
3046 set_momentary_breakpoint (sr_sal
, NULL
, bp_step_resume
);
3047 if (breakpoints_inserted
)
3048 insert_breakpoints ();
3050 /* And make sure stepping stops right away then. */
3051 step_range_end
= step_range_start
;
3056 /* We've just entered a callee, and we wish to resume until it returns
3057 to the caller. Setting a step_resume breakpoint on the return
3058 address will catch a return from the callee.
3060 However, if the callee is recursing, we want to be careful not to
3061 catch returns of those recursive calls, but only of THIS instance
3064 To do this, we set the step_resume bp's frame to our current
3065 caller's frame (step_frame_address, which is set by the "next" or
3066 "until" command, before execution begins). */
3069 step_over_function (struct execution_control_state
*ecs
)
3071 struct symtab_and_line sr_sal
;
3073 INIT_SAL (&sr_sal
); /* initialize to zeros */
3074 sr_sal
.pc
= ADDR_BITS_REMOVE (SAVED_PC_AFTER_CALL (get_current_frame ()));
3075 sr_sal
.section
= find_pc_overlay (sr_sal
.pc
);
3077 check_for_old_step_resume_breakpoint ();
3078 step_resume_breakpoint
=
3079 set_momentary_breakpoint (sr_sal
, get_current_frame (), bp_step_resume
);
3081 if (step_frame_address
&& !IN_SOLIB_DYNSYM_RESOLVE_CODE (sr_sal
.pc
))
3082 step_resume_breakpoint
->frame
= step_frame_address
;
3084 if (breakpoints_inserted
)
3085 insert_breakpoints ();
3089 stop_stepping (struct execution_control_state
*ecs
)
3091 if (target_has_execution
)
3093 /* Are we stopping for a vfork event? We only stop when we see
3094 the child's event. However, we may not yet have seen the
3095 parent's event. And, inferior_pid is still set to the
3096 parent's pid, until we resume again and follow either the
3099 To ensure that we can really touch inferior_pid (aka, the
3100 parent process) -- which calls to functions like read_pc
3101 implicitly do -- wait on the parent if necessary. */
3102 if ((pending_follow
.kind
== TARGET_WAITKIND_VFORKED
)
3103 && !pending_follow
.fork_event
.saw_parent_fork
)
3109 if (target_wait_hook
)
3110 parent_pid
= target_wait_hook (-1, &(ecs
->ws
));
3112 parent_pid
= target_wait (-1, &(ecs
->ws
));
3114 while (parent_pid
!= inferior_pid
);
3117 /* Assuming the inferior still exists, set these up for next
3118 time, just like we did above if we didn't break out of the
3120 prev_pc
= read_pc ();
3121 prev_func_start
= ecs
->stop_func_start
;
3122 prev_func_name
= ecs
->stop_func_name
;
3125 /* Let callers know we don't want to wait for the inferior anymore. */
3126 ecs
->wait_some_more
= 0;
3129 /* This function handles various cases where we need to continue
3130 waiting for the inferior. */
3131 /* (Used to be the keep_going: label in the old wait_for_inferior) */
3134 keep_going (struct execution_control_state
*ecs
)
3136 /* ??rehrauer: ttrace on HP-UX theoretically allows one to debug a
3137 vforked child between its creation and subsequent exit or call to
3138 exec(). However, I had big problems in this rather creaky exec
3139 engine, getting that to work. The fundamental problem is that
3140 I'm trying to debug two processes via an engine that only
3141 understands a single process with possibly multiple threads.
3143 Hence, this spot is known to have problems when
3144 target_can_follow_vfork_prior_to_exec returns 1. */
3146 /* Save the pc before execution, to compare with pc after stop. */
3147 prev_pc
= read_pc (); /* Might have been DECR_AFTER_BREAK */
3148 prev_func_start
= ecs
->stop_func_start
; /* Ok, since if DECR_PC_AFTER
3149 BREAK is defined, the
3150 original pc would not have
3151 been at the start of a
3153 prev_func_name
= ecs
->stop_func_name
;
3155 if (ecs
->update_step_sp
)
3156 step_sp
= read_sp ();
3157 ecs
->update_step_sp
= 0;
3159 /* If we did not do break;, it means we should keep running the
3160 inferior and not return to debugger. */
3162 if (trap_expected
&& stop_signal
!= TARGET_SIGNAL_TRAP
)
3164 /* We took a signal (which we are supposed to pass through to
3165 the inferior, else we'd have done a break above) and we
3166 haven't yet gotten our trap. Simply continue. */
3167 resume (currently_stepping (ecs
), stop_signal
);
3171 /* Either the trap was not expected, but we are continuing
3172 anyway (the user asked that this signal be passed to the
3175 The signal was SIGTRAP, e.g. it was our signal, but we
3176 decided we should resume from it.
3178 We're going to run this baby now!
3180 Insert breakpoints now, unless we are trying to one-proceed
3181 past a breakpoint. */
3182 /* If we've just finished a special step resume and we don't
3183 want to hit a breakpoint, pull em out. */
3184 if (step_resume_breakpoint
== NULL
3185 && through_sigtramp_breakpoint
== NULL
3186 && ecs
->remove_breakpoints_on_following_step
)
3188 ecs
->remove_breakpoints_on_following_step
= 0;
3189 remove_breakpoints ();
3190 breakpoints_inserted
= 0;
3192 else if (!breakpoints_inserted
&&
3193 (through_sigtramp_breakpoint
!= NULL
|| !ecs
->another_trap
))
3195 breakpoints_failed
= insert_breakpoints ();
3196 if (breakpoints_failed
)
3198 stop_stepping (ecs
);
3201 breakpoints_inserted
= 1;
3204 trap_expected
= ecs
->another_trap
;
3206 /* Do not deliver SIGNAL_TRAP (except when the user explicitly
3207 specifies that such a signal should be delivered to the
3210 Typically, this would occure when a user is debugging a
3211 target monitor on a simulator: the target monitor sets a
3212 breakpoint; the simulator encounters this break-point and
3213 halts the simulation handing control to GDB; GDB, noteing
3214 that the break-point isn't valid, returns control back to the
3215 simulator; the simulator then delivers the hardware
3216 equivalent of a SIGNAL_TRAP to the program being debugged. */
3218 if (stop_signal
== TARGET_SIGNAL_TRAP
3219 && !signal_program
[stop_signal
])
3220 stop_signal
= TARGET_SIGNAL_0
;
3222 #ifdef SHIFT_INST_REGS
3223 /* I'm not sure when this following segment applies. I do know,
3224 now, that we shouldn't rewrite the regs when we were stopped
3225 by a random signal from the inferior process. */
3226 /* FIXME: Shouldn't this be based on the valid bit of the SXIP?
3227 (this is only used on the 88k). */
3229 if (!bpstat_explains_signal (stop_bpstat
)
3230 && (stop_signal
!= TARGET_SIGNAL_CHLD
)
3231 && !stopped_by_random_signal
)
3233 #endif /* SHIFT_INST_REGS */
3235 resume (currently_stepping (ecs
), stop_signal
);
3238 prepare_to_wait (ecs
);
3241 /* This function normally comes after a resume, before
3242 handle_inferior_event exits. It takes care of any last bits of
3243 housekeeping, and sets the all-important wait_some_more flag. */
3246 prepare_to_wait (struct execution_control_state
*ecs
)
3248 if (ecs
->infwait_state
== infwait_normal_state
)
3250 overlay_cache_invalid
= 1;
3252 /* We have to invalidate the registers BEFORE calling
3253 target_wait because they can be loaded from the target while
3254 in target_wait. This makes remote debugging a bit more
3255 efficient for those targets that provide critical registers
3256 as part of their normal status mechanism. */
3258 registers_changed ();
3259 ecs
->waiton_pid
= -1;
3260 ecs
->wp
= &(ecs
->ws
);
3262 /* This is the old end of the while loop. Let everybody know we
3263 want to wait for the inferior some more and get called again
3265 ecs
->wait_some_more
= 1;
3268 /* Print why the inferior has stopped. We always print something when
3269 the inferior exits, or receives a signal. The rest of the cases are
3270 dealt with later on in normal_stop() and print_it_typical(). Ideally
3271 there should be a call to this function from handle_inferior_event()
3272 each time stop_stepping() is called.*/
3274 print_stop_reason (enum inferior_stop_reason stop_reason
, int stop_info
)
3276 switch (stop_reason
)
3279 /* We don't deal with these cases from handle_inferior_event()
3282 case END_STEPPING_RANGE
:
3283 /* We are done with a step/next/si/ni command. */
3284 /* For now print nothing. */
3286 /* Print a message only if not in the middle of doing a "step n"
3287 operation for n > 1 */
3288 if (!step_multi
|| !stop_step
)
3289 if (interpreter_p
&& strcmp (interpreter_p
, "mi") == 0)
3290 ui_out_field_string (uiout
, "reason", "end-stepping-range");
3293 case BREAKPOINT_HIT
:
3294 /* We found a breakpoint. */
3295 /* For now print nothing. */
3298 /* The inferior was terminated by a signal. */
3300 annotate_signalled ();
3301 if (interpreter_p
&& strcmp (interpreter_p
, "mi") == 0)
3302 ui_out_field_string (uiout
, "reason", "exited-signalled");
3303 ui_out_text (uiout
, "\nProgram terminated with signal ");
3304 annotate_signal_name ();
3305 ui_out_field_string (uiout
, "signal-name", target_signal_to_name (stop_info
));
3306 annotate_signal_name_end ();
3307 ui_out_text (uiout
, ", ");
3308 annotate_signal_string ();
3309 ui_out_field_string (uiout
, "signal-meaning", target_signal_to_string (stop_info
));
3310 annotate_signal_string_end ();
3311 ui_out_text (uiout
, ".\n");
3312 ui_out_text (uiout
, "The program no longer exists.\n");
3314 annotate_signalled ();
3315 printf_filtered ("\nProgram terminated with signal ");
3316 annotate_signal_name ();
3317 printf_filtered ("%s", target_signal_to_name (stop_info
));
3318 annotate_signal_name_end ();
3319 printf_filtered (", ");
3320 annotate_signal_string ();
3321 printf_filtered ("%s", target_signal_to_string (stop_info
));
3322 annotate_signal_string_end ();
3323 printf_filtered (".\n");
3325 printf_filtered ("The program no longer exists.\n");
3326 gdb_flush (gdb_stdout
);
3330 /* The inferior program is finished. */
3332 annotate_exited (stop_info
);
3335 if (interpreter_p
&& strcmp (interpreter_p
, "mi") == 0)
3336 ui_out_field_string (uiout
, "reason", "exited");
3337 ui_out_text (uiout
, "\nProgram exited with code ");
3338 ui_out_field_fmt (uiout
, "exit-code", "0%o", (unsigned int) stop_info
);
3339 ui_out_text (uiout
, ".\n");
3343 if (interpreter_p
&& strcmp (interpreter_p
, "mi") == 0)
3344 ui_out_field_string (uiout
, "reason", "exited-normally");
3345 ui_out_text (uiout
, "\nProgram exited normally.\n");
3348 annotate_exited (stop_info
);
3350 printf_filtered ("\nProgram exited with code 0%o.\n",
3351 (unsigned int) stop_info
);
3353 printf_filtered ("\nProgram exited normally.\n");
3356 case SIGNAL_RECEIVED
:
3357 /* Signal received. The signal table tells us to print about
3361 ui_out_text (uiout
, "\nProgram received signal ");
3362 annotate_signal_name ();
3363 ui_out_field_string (uiout
, "signal-name", target_signal_to_name (stop_info
));
3364 annotate_signal_name_end ();
3365 ui_out_text (uiout
, ", ");
3366 annotate_signal_string ();
3367 ui_out_field_string (uiout
, "signal-meaning", target_signal_to_string (stop_info
));
3368 annotate_signal_string_end ();
3369 ui_out_text (uiout
, ".\n");
3372 printf_filtered ("\nProgram received signal ");
3373 annotate_signal_name ();
3374 printf_filtered ("%s", target_signal_to_name (stop_info
));
3375 annotate_signal_name_end ();
3376 printf_filtered (", ");
3377 annotate_signal_string ();
3378 printf_filtered ("%s", target_signal_to_string (stop_info
));
3379 annotate_signal_string_end ();
3380 printf_filtered (".\n");
3381 gdb_flush (gdb_stdout
);
3385 internal_error ("print_stop_reason: unrecognized enum value");
3391 /* Here to return control to GDB when the inferior stops for real.
3392 Print appropriate messages, remove breakpoints, give terminal our modes.
3394 STOP_PRINT_FRAME nonzero means print the executing frame
3395 (pc, function, args, file, line number and line text).
3396 BREAKPOINTS_FAILED nonzero means stop was due to error
3397 attempting to insert breakpoints. */
3402 /* As with the notification of thread events, we want to delay
3403 notifying the user that we've switched thread context until
3404 the inferior actually stops.
3406 (Note that there's no point in saying anything if the inferior
3408 if ((previous_inferior_pid
!= inferior_pid
)
3409 && target_has_execution
)
3411 target_terminal_ours_for_output ();
3412 printf_filtered ("[Switching to %s]\n",
3413 target_pid_or_tid_to_str (inferior_pid
));
3414 previous_inferior_pid
= inferior_pid
;
3417 /* Make sure that the current_frame's pc is correct. This
3418 is a correction for setting up the frame info before doing
3419 DECR_PC_AFTER_BREAK */
3420 if (target_has_execution
&& get_current_frame ())
3421 (get_current_frame ())->pc
= read_pc ();
3423 if (breakpoints_failed
)
3425 target_terminal_ours_for_output ();
3426 print_sys_errmsg ("While inserting breakpoints", breakpoints_failed
);
3427 printf_filtered ("Stopped; cannot insert breakpoints.\n\
3428 The same program may be running in another process,\n\
3429 or you may have requested too many hardware breakpoints\n\
3430 and/or watchpoints.\n");
3433 if (target_has_execution
&& breakpoints_inserted
)
3435 if (remove_breakpoints ())
3437 target_terminal_ours_for_output ();
3438 printf_filtered ("Cannot remove breakpoints because ");
3439 printf_filtered ("program is no longer writable.\n");
3440 printf_filtered ("It might be running in another process.\n");
3441 printf_filtered ("Further execution is probably impossible.\n");
3444 breakpoints_inserted
= 0;
3446 /* Delete the breakpoint we stopped at, if it wants to be deleted.
3447 Delete any breakpoint that is to be deleted at the next stop. */
3449 breakpoint_auto_delete (stop_bpstat
);
3451 /* If an auto-display called a function and that got a signal,
3452 delete that auto-display to avoid an infinite recursion. */
3454 if (stopped_by_random_signal
)
3455 disable_current_display ();
3457 /* Don't print a message if in the middle of doing a "step n"
3458 operation for n > 1 */
3459 if (step_multi
&& stop_step
)
3462 target_terminal_ours ();
3464 /* Look up the hook_stop and run it if it exists. */
3466 if (stop_command
&& stop_command
->hook_pre
)
3468 catch_errors (hook_stop_stub
, stop_command
->hook_pre
,
3469 "Error while running hook_stop:\n", RETURN_MASK_ALL
);
3472 if (!target_has_stack
)
3478 /* Select innermost stack frame - i.e., current frame is frame 0,
3479 and current location is based on that.
3480 Don't do this on return from a stack dummy routine,
3481 or if the program has exited. */
3483 if (!stop_stack_dummy
)
3485 select_frame (get_current_frame (), 0);
3487 /* Print current location without a level number, if
3488 we have changed functions or hit a breakpoint.
3489 Print source line if we have one.
3490 bpstat_print() contains the logic deciding in detail
3491 what to print, based on the event(s) that just occurred. */
3493 if (stop_print_frame
3498 int do_frame_printing
= 1;
3500 bpstat_ret
= bpstat_print (stop_bpstat
);
3505 && step_frame_address
== FRAME_FP (get_current_frame ())
3506 && step_start_function
== find_pc_function (stop_pc
))
3507 source_flag
= SRC_LINE
; /* finished step, just print source line */
3509 source_flag
= SRC_AND_LOC
; /* print location and source line */
3511 case PRINT_SRC_AND_LOC
:
3512 source_flag
= SRC_AND_LOC
; /* print location and source line */
3514 case PRINT_SRC_ONLY
:
3515 source_flag
= SRC_LINE
;
3518 do_frame_printing
= 0;
3521 internal_error ("Unknown value.");
3524 /* For mi, have the same behavior every time we stop:
3525 print everything but the source line. */
3526 if (interpreter_p
&& strcmp (interpreter_p
, "mi") == 0)
3527 source_flag
= LOC_AND_ADDRESS
;
3531 if (interpreter_p
&& strcmp (interpreter_p
, "mi") == 0)
3532 ui_out_field_int (uiout
, "thread-id", pid_to_thread_id (inferior_pid
));
3534 /* The behavior of this routine with respect to the source
3536 SRC_LINE: Print only source line
3537 LOCATION: Print only location
3538 SRC_AND_LOC: Print location and source line */
3539 if (do_frame_printing
)
3540 show_and_print_stack_frame (selected_frame
, -1, source_flag
);
3542 /* Display the auto-display expressions. */
3547 /* Save the function value return registers, if we care.
3548 We might be about to restore their previous contents. */
3549 if (proceed_to_finish
)
3550 read_register_bytes (0, stop_registers
, REGISTER_BYTES
);
3552 if (stop_stack_dummy
)
3554 /* Pop the empty frame that contains the stack dummy.
3555 POP_FRAME ends with a setting of the current frame, so we
3556 can use that next. */
3558 /* Set stop_pc to what it was before we called the function.
3559 Can't rely on restore_inferior_status because that only gets
3560 called if we don't stop in the called function. */
3561 stop_pc
= read_pc ();
3562 select_frame (get_current_frame (), 0);
3566 TUIDO (((TuiOpaqueFuncPtr
) tui_vCheckDataValues
, selected_frame
));
3569 annotate_stopped ();
3573 hook_stop_stub (void *cmd
)
3575 execute_user_command ((struct cmd_list_element
*) cmd
, 0);
3580 signal_stop_state (int signo
)
3582 return signal_stop
[signo
];
3586 signal_print_state (int signo
)
3588 return signal_print
[signo
];
3592 signal_pass_state (int signo
)
3594 return signal_program
[signo
];
3597 int signal_stop_update (signo
, state
)
3601 int ret
= signal_stop
[signo
];
3602 signal_stop
[signo
] = state
;
3606 int signal_print_update (signo
, state
)
3610 int ret
= signal_print
[signo
];
3611 signal_print
[signo
] = state
;
3615 int signal_pass_update (signo
, state
)
3619 int ret
= signal_program
[signo
];
3620 signal_program
[signo
] = state
;
3625 sig_print_header (void)
3628 Signal Stop\tPrint\tPass to program\tDescription\n");
3632 sig_print_info (enum target_signal oursig
)
3634 char *name
= target_signal_to_name (oursig
);
3635 int name_padding
= 13 - strlen (name
);
3637 if (name_padding
<= 0)
3640 printf_filtered ("%s", name
);
3641 printf_filtered ("%*.*s ", name_padding
, name_padding
,
3643 printf_filtered ("%s\t", signal_stop
[oursig
] ? "Yes" : "No");
3644 printf_filtered ("%s\t", signal_print
[oursig
] ? "Yes" : "No");
3645 printf_filtered ("%s\t\t", signal_program
[oursig
] ? "Yes" : "No");
3646 printf_filtered ("%s\n", target_signal_to_string (oursig
));
3649 /* Specify how various signals in the inferior should be handled. */
3652 handle_command (char *args
, int from_tty
)
3655 int digits
, wordlen
;
3656 int sigfirst
, signum
, siglast
;
3657 enum target_signal oursig
;
3660 unsigned char *sigs
;
3661 struct cleanup
*old_chain
;
3665 error_no_arg ("signal to handle");
3668 /* Allocate and zero an array of flags for which signals to handle. */
3670 nsigs
= (int) TARGET_SIGNAL_LAST
;
3671 sigs
= (unsigned char *) alloca (nsigs
);
3672 memset (sigs
, 0, nsigs
);
3674 /* Break the command line up into args. */
3676 argv
= buildargv (args
);
3681 old_chain
= make_cleanup_freeargv (argv
);
3683 /* Walk through the args, looking for signal oursigs, signal names, and
3684 actions. Signal numbers and signal names may be interspersed with
3685 actions, with the actions being performed for all signals cumulatively
3686 specified. Signal ranges can be specified as <LOW>-<HIGH>. */
3688 while (*argv
!= NULL
)
3690 wordlen
= strlen (*argv
);
3691 for (digits
= 0; isdigit ((*argv
)[digits
]); digits
++)
3695 sigfirst
= siglast
= -1;
3697 if (wordlen
>= 1 && !strncmp (*argv
, "all", wordlen
))
3699 /* Apply action to all signals except those used by the
3700 debugger. Silently skip those. */
3703 siglast
= nsigs
- 1;
3705 else if (wordlen
>= 1 && !strncmp (*argv
, "stop", wordlen
))
3707 SET_SIGS (nsigs
, sigs
, signal_stop
);
3708 SET_SIGS (nsigs
, sigs
, signal_print
);
3710 else if (wordlen
>= 1 && !strncmp (*argv
, "ignore", wordlen
))
3712 UNSET_SIGS (nsigs
, sigs
, signal_program
);
3714 else if (wordlen
>= 2 && !strncmp (*argv
, "print", wordlen
))
3716 SET_SIGS (nsigs
, sigs
, signal_print
);
3718 else if (wordlen
>= 2 && !strncmp (*argv
, "pass", wordlen
))
3720 SET_SIGS (nsigs
, sigs
, signal_program
);
3722 else if (wordlen
>= 3 && !strncmp (*argv
, "nostop", wordlen
))
3724 UNSET_SIGS (nsigs
, sigs
, signal_stop
);
3726 else if (wordlen
>= 3 && !strncmp (*argv
, "noignore", wordlen
))
3728 SET_SIGS (nsigs
, sigs
, signal_program
);
3730 else if (wordlen
>= 4 && !strncmp (*argv
, "noprint", wordlen
))
3732 UNSET_SIGS (nsigs
, sigs
, signal_print
);
3733 UNSET_SIGS (nsigs
, sigs
, signal_stop
);
3735 else if (wordlen
>= 4 && !strncmp (*argv
, "nopass", wordlen
))
3737 UNSET_SIGS (nsigs
, sigs
, signal_program
);
3739 else if (digits
> 0)
3741 /* It is numeric. The numeric signal refers to our own
3742 internal signal numbering from target.h, not to host/target
3743 signal number. This is a feature; users really should be
3744 using symbolic names anyway, and the common ones like
3745 SIGHUP, SIGINT, SIGALRM, etc. will work right anyway. */
3747 sigfirst
= siglast
= (int)
3748 target_signal_from_command (atoi (*argv
));
3749 if ((*argv
)[digits
] == '-')
3752 target_signal_from_command (atoi ((*argv
) + digits
+ 1));
3754 if (sigfirst
> siglast
)
3756 /* Bet he didn't figure we'd think of this case... */
3764 oursig
= target_signal_from_name (*argv
);
3765 if (oursig
!= TARGET_SIGNAL_UNKNOWN
)
3767 sigfirst
= siglast
= (int) oursig
;
3771 /* Not a number and not a recognized flag word => complain. */
3772 error ("Unrecognized or ambiguous flag word: \"%s\".", *argv
);
3776 /* If any signal numbers or symbol names were found, set flags for
3777 which signals to apply actions to. */
3779 for (signum
= sigfirst
; signum
>= 0 && signum
<= siglast
; signum
++)
3781 switch ((enum target_signal
) signum
)
3783 case TARGET_SIGNAL_TRAP
:
3784 case TARGET_SIGNAL_INT
:
3785 if (!allsigs
&& !sigs
[signum
])
3787 if (query ("%s is used by the debugger.\n\
3788 Are you sure you want to change it? ",
3789 target_signal_to_name
3790 ((enum target_signal
) signum
)))
3796 printf_unfiltered ("Not confirmed, unchanged.\n");
3797 gdb_flush (gdb_stdout
);
3801 case TARGET_SIGNAL_0
:
3802 case TARGET_SIGNAL_DEFAULT
:
3803 case TARGET_SIGNAL_UNKNOWN
:
3804 /* Make sure that "all" doesn't print these. */
3815 target_notice_signals (inferior_pid
);
3819 /* Show the results. */
3820 sig_print_header ();
3821 for (signum
= 0; signum
< nsigs
; signum
++)
3825 sig_print_info (signum
);
3830 do_cleanups (old_chain
);
3834 xdb_handle_command (char *args
, int from_tty
)
3837 struct cleanup
*old_chain
;
3839 /* Break the command line up into args. */
3841 argv
= buildargv (args
);
3846 old_chain
= make_cleanup_freeargv (argv
);
3847 if (argv
[1] != (char *) NULL
)
3852 bufLen
= strlen (argv
[0]) + 20;
3853 argBuf
= (char *) xmalloc (bufLen
);
3857 enum target_signal oursig
;
3859 oursig
= target_signal_from_name (argv
[0]);
3860 memset (argBuf
, 0, bufLen
);
3861 if (strcmp (argv
[1], "Q") == 0)
3862 sprintf (argBuf
, "%s %s", argv
[0], "noprint");
3865 if (strcmp (argv
[1], "s") == 0)
3867 if (!signal_stop
[oursig
])
3868 sprintf (argBuf
, "%s %s", argv
[0], "stop");
3870 sprintf (argBuf
, "%s %s", argv
[0], "nostop");
3872 else if (strcmp (argv
[1], "i") == 0)
3874 if (!signal_program
[oursig
])
3875 sprintf (argBuf
, "%s %s", argv
[0], "pass");
3877 sprintf (argBuf
, "%s %s", argv
[0], "nopass");
3879 else if (strcmp (argv
[1], "r") == 0)
3881 if (!signal_print
[oursig
])
3882 sprintf (argBuf
, "%s %s", argv
[0], "print");
3884 sprintf (argBuf
, "%s %s", argv
[0], "noprint");
3890 handle_command (argBuf
, from_tty
);
3892 printf_filtered ("Invalid signal handling flag.\n");
3897 do_cleanups (old_chain
);
3900 /* Print current contents of the tables set by the handle command.
3901 It is possible we should just be printing signals actually used
3902 by the current target (but for things to work right when switching
3903 targets, all signals should be in the signal tables). */
3906 signals_info (char *signum_exp
, int from_tty
)
3908 enum target_signal oursig
;
3909 sig_print_header ();
3913 /* First see if this is a symbol name. */
3914 oursig
= target_signal_from_name (signum_exp
);
3915 if (oursig
== TARGET_SIGNAL_UNKNOWN
)
3917 /* No, try numeric. */
3919 target_signal_from_command (parse_and_eval_long (signum_exp
));
3921 sig_print_info (oursig
);
3925 printf_filtered ("\n");
3926 /* These ugly casts brought to you by the native VAX compiler. */
3927 for (oursig
= TARGET_SIGNAL_FIRST
;
3928 (int) oursig
< (int) TARGET_SIGNAL_LAST
;
3929 oursig
= (enum target_signal
) ((int) oursig
+ 1))
3933 if (oursig
!= TARGET_SIGNAL_UNKNOWN
3934 && oursig
!= TARGET_SIGNAL_DEFAULT
3935 && oursig
!= TARGET_SIGNAL_0
)
3936 sig_print_info (oursig
);
3939 printf_filtered ("\nUse the \"handle\" command to change these tables.\n");
3942 struct inferior_status
3944 enum target_signal stop_signal
;
3948 int stop_stack_dummy
;
3949 int stopped_by_random_signal
;
3951 CORE_ADDR step_range_start
;
3952 CORE_ADDR step_range_end
;
3953 CORE_ADDR step_frame_address
;
3954 enum step_over_calls_kind step_over_calls
;
3955 CORE_ADDR step_resume_break_address
;
3956 int stop_after_trap
;
3957 int stop_soon_quietly
;
3958 CORE_ADDR selected_frame_address
;
3959 char *stop_registers
;
3961 /* These are here because if call_function_by_hand has written some
3962 registers and then decides to call error(), we better not have changed
3967 int breakpoint_proceeded
;
3968 int restore_stack_info
;
3969 int proceed_to_finish
;
3972 static struct inferior_status
*
3973 xmalloc_inferior_status (void)
3975 struct inferior_status
*inf_status
;
3976 inf_status
= xmalloc (sizeof (struct inferior_status
));
3977 inf_status
->stop_registers
= xmalloc (REGISTER_BYTES
);
3978 inf_status
->registers
= xmalloc (REGISTER_BYTES
);
3983 free_inferior_status (struct inferior_status
*inf_status
)
3985 free (inf_status
->registers
);
3986 free (inf_status
->stop_registers
);
3991 write_inferior_status_register (struct inferior_status
*inf_status
, int regno
,
3994 int size
= REGISTER_RAW_SIZE (regno
);
3995 void *buf
= alloca (size
);
3996 store_signed_integer (buf
, size
, val
);
3997 memcpy (&inf_status
->registers
[REGISTER_BYTE (regno
)], buf
, size
);
4000 /* Save all of the information associated with the inferior<==>gdb
4001 connection. INF_STATUS is a pointer to a "struct inferior_status"
4002 (defined in inferior.h). */
4004 struct inferior_status
*
4005 save_inferior_status (int restore_stack_info
)
4007 struct inferior_status
*inf_status
= xmalloc_inferior_status ();
4009 inf_status
->stop_signal
= stop_signal
;
4010 inf_status
->stop_pc
= stop_pc
;
4011 inf_status
->stop_step
= stop_step
;
4012 inf_status
->stop_stack_dummy
= stop_stack_dummy
;
4013 inf_status
->stopped_by_random_signal
= stopped_by_random_signal
;
4014 inf_status
->trap_expected
= trap_expected
;
4015 inf_status
->step_range_start
= step_range_start
;
4016 inf_status
->step_range_end
= step_range_end
;
4017 inf_status
->step_frame_address
= step_frame_address
;
4018 inf_status
->step_over_calls
= step_over_calls
;
4019 inf_status
->stop_after_trap
= stop_after_trap
;
4020 inf_status
->stop_soon_quietly
= stop_soon_quietly
;
4021 /* Save original bpstat chain here; replace it with copy of chain.
4022 If caller's caller is walking the chain, they'll be happier if we
4023 hand them back the original chain when restore_inferior_status is
4025 inf_status
->stop_bpstat
= stop_bpstat
;
4026 stop_bpstat
= bpstat_copy (stop_bpstat
);
4027 inf_status
->breakpoint_proceeded
= breakpoint_proceeded
;
4028 inf_status
->restore_stack_info
= restore_stack_info
;
4029 inf_status
->proceed_to_finish
= proceed_to_finish
;
4031 memcpy (inf_status
->stop_registers
, stop_registers
, REGISTER_BYTES
);
4033 read_register_bytes (0, inf_status
->registers
, REGISTER_BYTES
);
4035 record_selected_frame (&(inf_status
->selected_frame_address
),
4036 &(inf_status
->selected_level
));
4040 struct restore_selected_frame_args
4042 CORE_ADDR frame_address
;
4047 restore_selected_frame (void *args
)
4049 struct restore_selected_frame_args
*fr
=
4050 (struct restore_selected_frame_args
*) args
;
4051 struct frame_info
*frame
;
4052 int level
= fr
->level
;
4054 frame
= find_relative_frame (get_current_frame (), &level
);
4056 /* If inf_status->selected_frame_address is NULL, there was no
4057 previously selected frame. */
4058 if (frame
== NULL
||
4059 /* FRAME_FP (frame) != fr->frame_address || */
4060 /* elz: deleted this check as a quick fix to the problem that
4061 for function called by hand gdb creates no internal frame
4062 structure and the real stack and gdb's idea of stack are
4063 different if nested calls by hands are made.
4065 mvs: this worries me. */
4068 warning ("Unable to restore previously selected frame.\n");
4072 select_frame (frame
, fr
->level
);
4078 restore_inferior_status (struct inferior_status
*inf_status
)
4080 stop_signal
= inf_status
->stop_signal
;
4081 stop_pc
= inf_status
->stop_pc
;
4082 stop_step
= inf_status
->stop_step
;
4083 stop_stack_dummy
= inf_status
->stop_stack_dummy
;
4084 stopped_by_random_signal
= inf_status
->stopped_by_random_signal
;
4085 trap_expected
= inf_status
->trap_expected
;
4086 step_range_start
= inf_status
->step_range_start
;
4087 step_range_end
= inf_status
->step_range_end
;
4088 step_frame_address
= inf_status
->step_frame_address
;
4089 step_over_calls
= inf_status
->step_over_calls
;
4090 stop_after_trap
= inf_status
->stop_after_trap
;
4091 stop_soon_quietly
= inf_status
->stop_soon_quietly
;
4092 bpstat_clear (&stop_bpstat
);
4093 stop_bpstat
= inf_status
->stop_bpstat
;
4094 breakpoint_proceeded
= inf_status
->breakpoint_proceeded
;
4095 proceed_to_finish
= inf_status
->proceed_to_finish
;
4097 /* FIXME: Is the restore of stop_registers always needed */
4098 memcpy (stop_registers
, inf_status
->stop_registers
, REGISTER_BYTES
);
4100 /* The inferior can be gone if the user types "print exit(0)"
4101 (and perhaps other times). */
4102 if (target_has_execution
)
4103 write_register_bytes (0, inf_status
->registers
, REGISTER_BYTES
);
4105 /* FIXME: If we are being called after stopping in a function which
4106 is called from gdb, we should not be trying to restore the
4107 selected frame; it just prints a spurious error message (The
4108 message is useful, however, in detecting bugs in gdb (like if gdb
4109 clobbers the stack)). In fact, should we be restoring the
4110 inferior status at all in that case? . */
4112 if (target_has_stack
&& inf_status
->restore_stack_info
)
4114 struct restore_selected_frame_args fr
;
4115 fr
.level
= inf_status
->selected_level
;
4116 fr
.frame_address
= inf_status
->selected_frame_address
;
4117 /* The point of catch_errors is that if the stack is clobbered,
4118 walking the stack might encounter a garbage pointer and error()
4119 trying to dereference it. */
4120 if (catch_errors (restore_selected_frame
, &fr
,
4121 "Unable to restore previously selected frame:\n",
4122 RETURN_MASK_ERROR
) == 0)
4123 /* Error in restoring the selected frame. Select the innermost
4127 select_frame (get_current_frame (), 0);
4131 free_inferior_status (inf_status
);
4135 do_restore_inferior_status_cleanup (void *sts
)
4137 restore_inferior_status (sts
);
4141 make_cleanup_restore_inferior_status (struct inferior_status
*inf_status
)
4143 return make_cleanup (do_restore_inferior_status_cleanup
, inf_status
);
4147 discard_inferior_status (struct inferior_status
*inf_status
)
4149 /* See save_inferior_status for info on stop_bpstat. */
4150 bpstat_clear (&inf_status
->stop_bpstat
);
4151 free_inferior_status (inf_status
);
4158 stop_registers
= xmalloc (REGISTER_BYTES
);
4162 _initialize_infrun (void)
4165 register int numsigs
;
4166 struct cmd_list_element
*c
;
4170 register_gdbarch_swap (&stop_registers
, sizeof (stop_registers
), NULL
);
4171 register_gdbarch_swap (NULL
, 0, build_infrun
);
4173 add_info ("signals", signals_info
,
4174 "What debugger does when program gets various signals.\n\
4175 Specify a signal as argument to print info on that signal only.");
4176 add_info_alias ("handle", "signals", 0);
4178 add_com ("handle", class_run
, handle_command
,
4179 concat ("Specify how to handle a signal.\n\
4180 Args are signals and actions to apply to those signals.\n\
4181 Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\
4182 from 1-15 are allowed for compatibility with old versions of GDB.\n\
4183 Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\
4184 The special arg \"all\" is recognized to mean all signals except those\n\
4185 used by the debugger, typically SIGTRAP and SIGINT.\n",
4186 "Recognized actions include \"stop\", \"nostop\", \"print\", \"noprint\",\n\
4187 \"pass\", \"nopass\", \"ignore\", or \"noignore\".\n\
4188 Stop means reenter debugger if this signal happens (implies print).\n\
4189 Print means print a message if this signal happens.\n\
4190 Pass means let program see this signal; otherwise program doesn't know.\n\
4191 Ignore is a synonym for nopass and noignore is a synonym for pass.\n\
4192 Pass and Stop may be combined.", NULL
));
4195 add_com ("lz", class_info
, signals_info
,
4196 "What debugger does when program gets various signals.\n\
4197 Specify a signal as argument to print info on that signal only.");
4198 add_com ("z", class_run
, xdb_handle_command
,
4199 concat ("Specify how to handle a signal.\n\
4200 Args are signals and actions to apply to those signals.\n\
4201 Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\
4202 from 1-15 are allowed for compatibility with old versions of GDB.\n\
4203 Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\
4204 The special arg \"all\" is recognized to mean all signals except those\n\
4205 used by the debugger, typically SIGTRAP and SIGINT.\n",
4206 "Recognized actions include \"s\" (toggles between stop and nostop), \n\
4207 \"r\" (toggles between print and noprint), \"i\" (toggles between pass and \
4208 nopass), \"Q\" (noprint)\n\
4209 Stop means reenter debugger if this signal happens (implies print).\n\
4210 Print means print a message if this signal happens.\n\
4211 Pass means let program see this signal; otherwise program doesn't know.\n\
4212 Ignore is a synonym for nopass and noignore is a synonym for pass.\n\
4213 Pass and Stop may be combined.", NULL
));
4217 stop_command
= add_cmd ("stop", class_obscure
, not_just_help_class_command
,
4218 "There is no `stop' command, but you can set a hook on `stop'.\n\
4219 This allows you to set a list of commands to be run each time execution\n\
4220 of the program stops.", &cmdlist
);
4222 numsigs
= (int) TARGET_SIGNAL_LAST
;
4223 signal_stop
= (unsigned char *)
4224 xmalloc (sizeof (signal_stop
[0]) * numsigs
);
4225 signal_print
= (unsigned char *)
4226 xmalloc (sizeof (signal_print
[0]) * numsigs
);
4227 signal_program
= (unsigned char *)
4228 xmalloc (sizeof (signal_program
[0]) * numsigs
);
4229 for (i
= 0; i
< numsigs
; i
++)
4232 signal_print
[i
] = 1;
4233 signal_program
[i
] = 1;
4236 /* Signals caused by debugger's own actions
4237 should not be given to the program afterwards. */
4238 signal_program
[TARGET_SIGNAL_TRAP
] = 0;
4239 signal_program
[TARGET_SIGNAL_INT
] = 0;
4241 /* Signals that are not errors should not normally enter the debugger. */
4242 signal_stop
[TARGET_SIGNAL_ALRM
] = 0;
4243 signal_print
[TARGET_SIGNAL_ALRM
] = 0;
4244 signal_stop
[TARGET_SIGNAL_VTALRM
] = 0;
4245 signal_print
[TARGET_SIGNAL_VTALRM
] = 0;
4246 signal_stop
[TARGET_SIGNAL_PROF
] = 0;
4247 signal_print
[TARGET_SIGNAL_PROF
] = 0;
4248 signal_stop
[TARGET_SIGNAL_CHLD
] = 0;
4249 signal_print
[TARGET_SIGNAL_CHLD
] = 0;
4250 signal_stop
[TARGET_SIGNAL_IO
] = 0;
4251 signal_print
[TARGET_SIGNAL_IO
] = 0;
4252 signal_stop
[TARGET_SIGNAL_POLL
] = 0;
4253 signal_print
[TARGET_SIGNAL_POLL
] = 0;
4254 signal_stop
[TARGET_SIGNAL_URG
] = 0;
4255 signal_print
[TARGET_SIGNAL_URG
] = 0;
4256 signal_stop
[TARGET_SIGNAL_WINCH
] = 0;
4257 signal_print
[TARGET_SIGNAL_WINCH
] = 0;
4259 /* These signals are used internally by user-level thread
4260 implementations. (See signal(5) on Solaris.) Like the above
4261 signals, a healthy program receives and handles them as part of
4262 its normal operation. */
4263 signal_stop
[TARGET_SIGNAL_LWP
] = 0;
4264 signal_print
[TARGET_SIGNAL_LWP
] = 0;
4265 signal_stop
[TARGET_SIGNAL_WAITING
] = 0;
4266 signal_print
[TARGET_SIGNAL_WAITING
] = 0;
4267 signal_stop
[TARGET_SIGNAL_CANCEL
] = 0;
4268 signal_print
[TARGET_SIGNAL_CANCEL
] = 0;
4272 (add_set_cmd ("stop-on-solib-events", class_support
, var_zinteger
,
4273 (char *) &stop_on_solib_events
,
4274 "Set stopping for shared library events.\n\
4275 If nonzero, gdb will give control to the user when the dynamic linker\n\
4276 notifies gdb of shared library events. The most common event of interest\n\
4277 to the user would be loading/unloading of a new library.\n",
4282 c
= add_set_enum_cmd ("follow-fork-mode",
4284 follow_fork_mode_kind_names
,
4285 &follow_fork_mode_string
,
4286 /* ??rehrauer: The "both" option is broken, by what may be a 10.20
4287 kernel problem. It's also not terribly useful without a GUI to
4288 help the user drive two debuggers. So for now, I'm disabling
4289 the "both" option. */
4290 /* "Set debugger response to a program call of fork \
4292 A fork or vfork creates a new process. follow-fork-mode can be:\n\
4293 parent - the original process is debugged after a fork\n\
4294 child - the new process is debugged after a fork\n\
4295 both - both the parent and child are debugged after a fork\n\
4296 ask - the debugger will ask for one of the above choices\n\
4297 For \"both\", another copy of the debugger will be started to follow\n\
4298 the new child process. The original debugger will continue to follow\n\
4299 the original parent process. To distinguish their prompts, the\n\
4300 debugger copy's prompt will be changed.\n\
4301 For \"parent\" or \"child\", the unfollowed process will run free.\n\
4302 By default, the debugger will follow the parent process.",
4304 "Set debugger response to a program call of fork \
4306 A fork or vfork creates a new process. follow-fork-mode can be:\n\
4307 parent - the original process is debugged after a fork\n\
4308 child - the new process is debugged after a fork\n\
4309 ask - the debugger will ask for one of the above choices\n\
4310 For \"parent\" or \"child\", the unfollowed process will run free.\n\
4311 By default, the debugger will follow the parent process.",
4313 /* c->function.sfunc = ; */
4314 add_show_from_set (c
, &showlist
);
4316 c
= add_set_enum_cmd ("scheduler-locking", class_run
,
4317 scheduler_enums
, /* array of string names */
4318 &scheduler_mode
, /* current mode */
4319 "Set mode for locking scheduler during execution.\n\
4320 off == no locking (threads may preempt at any time)\n\
4321 on == full locking (no thread except the current thread may run)\n\
4322 step == scheduler locked during every single-step operation.\n\
4323 In this mode, no other thread may run during a step command.\n\
4324 Other threads may run while stepping over a function call ('next').",
4327 c
->function
.sfunc
= set_schedlock_func
; /* traps on target vector */
4328 add_show_from_set (c
, &showlist
);
4330 c
= add_set_cmd ("step-mode", class_run
,
4331 var_boolean
, (char*) &step_stop_if_no_debug
,
4332 "Set mode of the step operation. When set, doing a step over a\n\
4333 function without debug line information will stop at the first\n\
4334 instruction of that function. Otherwise, the function is skipped and\n\
4335 the step command stops at a different source line.",
4337 add_show_from_set (c
, &showlist
);