1 /* Target-struct-independent code to start (run) and stop an inferior process.
2 Copyright 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995,
3 1996, 1997, 1998, 1999, 2000, 2001 Free Software Foundation, Inc.
5 This file is part of GDB.
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 59 Temple Place - Suite 330,
20 Boston, MA 02111-1307, USA. */
23 #include "gdb_string.h"
28 #include "breakpoint.h"
32 #include "cli/cli-script.h"
34 #include "gdbthread.h"
43 /* Prototypes for local functions */
45 static void signals_info (char *, int);
47 static void handle_command (char *, int);
49 static void sig_print_info (enum target_signal
);
51 static void sig_print_header (void);
53 static void resume_cleanups (void *);
55 static int hook_stop_stub (void *);
57 static void delete_breakpoint_current_contents (void *);
59 static void set_follow_fork_mode_command (char *arg
, int from_tty
,
60 struct cmd_list_element
* c
);
62 static struct inferior_status
*xmalloc_inferior_status (void);
64 static void free_inferior_status (struct inferior_status
*);
66 static int restore_selected_frame (void *);
68 static void build_infrun (void);
70 static void follow_inferior_fork (int parent_pid
, int child_pid
,
71 int has_forked
, int has_vforked
);
73 static void follow_fork (int parent_pid
, int child_pid
);
75 static void follow_vfork (int parent_pid
, int child_pid
);
77 static void set_schedlock_func (char *args
, int from_tty
,
78 struct cmd_list_element
* c
);
80 struct execution_control_state
;
82 static int currently_stepping (struct execution_control_state
*ecs
);
84 static void xdb_handle_command (char *args
, int from_tty
);
86 void _initialize_infrun (void);
88 int inferior_ignoring_startup_exec_events
= 0;
89 int inferior_ignoring_leading_exec_events
= 0;
91 /* When set, stop the 'step' command if we enter a function which has
92 no line number information. The normal behavior is that we step
93 over such function. */
94 int step_stop_if_no_debug
= 0;
96 /* In asynchronous mode, but simulating synchronous execution. */
98 int sync_execution
= 0;
100 /* wait_for_inferior and normal_stop use this to notify the user
101 when the inferior stopped in a different thread than it had been
104 static ptid_t previous_inferior_ptid
;
106 /* This is true for configurations that may follow through execl() and
107 similar functions. At present this is only true for HP-UX native. */
109 #ifndef MAY_FOLLOW_EXEC
110 #define MAY_FOLLOW_EXEC (0)
113 static int may_follow_exec
= MAY_FOLLOW_EXEC
;
115 /* GET_LONGJMP_TARGET returns the PC at which longjmp() will resume the
116 program. It needs to examine the jmp_buf argument and extract the PC
117 from it. The return value is non-zero on success, zero otherwise. */
119 #ifndef GET_LONGJMP_TARGET
120 #define GET_LONGJMP_TARGET(PC_ADDR) 0
124 /* Dynamic function trampolines are similar to solib trampolines in that they
125 are between the caller and the callee. The difference is that when you
126 enter a dynamic trampoline, you can't determine the callee's address. Some
127 (usually complex) code needs to run in the dynamic trampoline to figure out
128 the callee's address. This macro is usually called twice. First, when we
129 enter the trampoline (looks like a normal function call at that point). It
130 should return the PC of a point within the trampoline where the callee's
131 address is known. Second, when we hit the breakpoint, this routine returns
132 the callee's address. At that point, things proceed as per a step resume
135 #ifndef DYNAMIC_TRAMPOLINE_NEXTPC
136 #define DYNAMIC_TRAMPOLINE_NEXTPC(pc) 0
139 /* If the program uses ELF-style shared libraries, then calls to
140 functions in shared libraries go through stubs, which live in a
141 table called the PLT (Procedure Linkage Table). The first time the
142 function is called, the stub sends control to the dynamic linker,
143 which looks up the function's real address, patches the stub so
144 that future calls will go directly to the function, and then passes
145 control to the function.
147 If we are stepping at the source level, we don't want to see any of
148 this --- we just want to skip over the stub and the dynamic linker.
149 The simple approach is to single-step until control leaves the
152 However, on some systems (e.g., Red Hat Linux 5.2) the dynamic
153 linker calls functions in the shared C library, so you can't tell
154 from the PC alone whether the dynamic linker is still running. In
155 this case, we use a step-resume breakpoint to get us past the
156 dynamic linker, as if we were using "next" to step over a function
159 IN_SOLIB_DYNSYM_RESOLVE_CODE says whether we're in the dynamic
160 linker code or not. Normally, this means we single-step. However,
161 if SKIP_SOLIB_RESOLVER then returns non-zero, then its value is an
162 address where we can place a step-resume breakpoint to get past the
163 linker's symbol resolution function.
165 IN_SOLIB_DYNSYM_RESOLVE_CODE can generally be implemented in a
166 pretty portable way, by comparing the PC against the address ranges
167 of the dynamic linker's sections.
169 SKIP_SOLIB_RESOLVER is generally going to be system-specific, since
170 it depends on internal details of the dynamic linker. It's usually
171 not too hard to figure out where to put a breakpoint, but it
172 certainly isn't portable. SKIP_SOLIB_RESOLVER should do plenty of
173 sanity checking. If it can't figure things out, returning zero and
174 getting the (possibly confusing) stepping behavior is better than
175 signalling an error, which will obscure the change in the
178 #ifndef IN_SOLIB_DYNSYM_RESOLVE_CODE
179 #define IN_SOLIB_DYNSYM_RESOLVE_CODE(pc) 0
182 #ifndef SKIP_SOLIB_RESOLVER
183 #define SKIP_SOLIB_RESOLVER(pc) 0
186 /* In some shared library schemes, the return path from a shared library
187 call may need to go through a trampoline too. */
189 #ifndef IN_SOLIB_RETURN_TRAMPOLINE
190 #define IN_SOLIB_RETURN_TRAMPOLINE(pc,name) 0
193 /* This function returns TRUE if pc is the address of an instruction
194 that lies within the dynamic linker (such as the event hook, or the
197 This function must be used only when a dynamic linker event has
198 been caught, and the inferior is being stepped out of the hook, or
199 undefined results are guaranteed. */
201 #ifndef SOLIB_IN_DYNAMIC_LINKER
202 #define SOLIB_IN_DYNAMIC_LINKER(pid,pc) 0
205 /* On MIPS16, a function that returns a floating point value may call
206 a library helper function to copy the return value to a floating point
207 register. The IGNORE_HELPER_CALL macro returns non-zero if we
208 should ignore (i.e. step over) this function call. */
209 #ifndef IGNORE_HELPER_CALL
210 #define IGNORE_HELPER_CALL(pc) 0
213 /* On some systems, the PC may be left pointing at an instruction that won't
214 actually be executed. This is usually indicated by a bit in the PSW. If
215 we find ourselves in such a state, then we step the target beyond the
216 nullified instruction before returning control to the user so as to avoid
219 #ifndef INSTRUCTION_NULLIFIED
220 #define INSTRUCTION_NULLIFIED 0
223 /* We can't step off a permanent breakpoint in the ordinary way, because we
224 can't remove it. Instead, we have to advance the PC to the next
225 instruction. This macro should expand to a pointer to a function that
226 does that, or zero if we have no such function. If we don't have a
227 definition for it, we have to report an error. */
228 #ifndef SKIP_PERMANENT_BREAKPOINT
229 #define SKIP_PERMANENT_BREAKPOINT (default_skip_permanent_breakpoint)
231 default_skip_permanent_breakpoint (void)
234 fprintf_filtered (gdb_stderr
, "\
235 The program is stopped at a permanent breakpoint, but GDB does not know\n\
236 how to step past a permanent breakpoint on this architecture. Try using\n\
237 a command like `return' or `jump' to continue execution.\n");
238 return_to_top_level (RETURN_ERROR
);
243 /* Convert the #defines into values. This is temporary until wfi control
244 flow is completely sorted out. */
246 #ifndef HAVE_STEPPABLE_WATCHPOINT
247 #define HAVE_STEPPABLE_WATCHPOINT 0
249 #undef HAVE_STEPPABLE_WATCHPOINT
250 #define HAVE_STEPPABLE_WATCHPOINT 1
253 #ifndef HAVE_NONSTEPPABLE_WATCHPOINT
254 #define HAVE_NONSTEPPABLE_WATCHPOINT 0
256 #undef HAVE_NONSTEPPABLE_WATCHPOINT
257 #define HAVE_NONSTEPPABLE_WATCHPOINT 1
260 #ifndef HAVE_CONTINUABLE_WATCHPOINT
261 #define HAVE_CONTINUABLE_WATCHPOINT 0
263 #undef HAVE_CONTINUABLE_WATCHPOINT
264 #define HAVE_CONTINUABLE_WATCHPOINT 1
267 #ifndef CANNOT_STEP_HW_WATCHPOINTS
268 #define CANNOT_STEP_HW_WATCHPOINTS 0
270 #undef CANNOT_STEP_HW_WATCHPOINTS
271 #define CANNOT_STEP_HW_WATCHPOINTS 1
274 /* Tables of how to react to signals; the user sets them. */
276 static unsigned char *signal_stop
;
277 static unsigned char *signal_print
;
278 static unsigned char *signal_program
;
280 #define SET_SIGS(nsigs,sigs,flags) \
282 int signum = (nsigs); \
283 while (signum-- > 0) \
284 if ((sigs)[signum]) \
285 (flags)[signum] = 1; \
288 #define UNSET_SIGS(nsigs,sigs,flags) \
290 int signum = (nsigs); \
291 while (signum-- > 0) \
292 if ((sigs)[signum]) \
293 (flags)[signum] = 0; \
296 /* Value to pass to target_resume() to cause all threads to resume */
298 #define RESUME_ALL (pid_to_ptid (-1))
300 /* Command list pointer for the "stop" placeholder. */
302 static struct cmd_list_element
*stop_command
;
304 /* Nonzero if breakpoints are now inserted in the inferior. */
306 static int breakpoints_inserted
;
308 /* Function inferior was in as of last step command. */
310 static struct symbol
*step_start_function
;
312 /* Nonzero if we are expecting a trace trap and should proceed from it. */
314 static int trap_expected
;
317 /* Nonzero if we want to give control to the user when we're notified
318 of shared library events by the dynamic linker. */
319 static int stop_on_solib_events
;
323 /* Nonzero if the next time we try to continue the inferior, it will
324 step one instruction and generate a spurious trace trap.
325 This is used to compensate for a bug in HP-UX. */
327 static int trap_expected_after_continue
;
330 /* Nonzero means expecting a trace trap
331 and should stop the inferior and return silently when it happens. */
335 /* Nonzero means expecting a trap and caller will handle it themselves.
336 It is used after attach, due to attaching to a process;
337 when running in the shell before the child program has been exec'd;
338 and when running some kinds of remote stuff (FIXME?). */
340 int stop_soon_quietly
;
342 /* Nonzero if proceed is being used for a "finish" command or a similar
343 situation when stop_registers should be saved. */
345 int proceed_to_finish
;
347 /* Save register contents here when about to pop a stack dummy frame,
348 if-and-only-if proceed_to_finish is set.
349 Thus this contains the return value from the called function (assuming
350 values are returned in a register). */
352 char *stop_registers
;
354 /* Nonzero if program stopped due to error trying to insert breakpoints. */
356 static int breakpoints_failed
;
358 /* Nonzero after stop if current stack frame should be printed. */
360 static int stop_print_frame
;
362 static struct breakpoint
*step_resume_breakpoint
= NULL
;
363 static struct breakpoint
*through_sigtramp_breakpoint
= NULL
;
365 /* On some platforms (e.g., HP-UX), hardware watchpoints have bad
366 interactions with an inferior that is running a kernel function
367 (aka, a system call or "syscall"). wait_for_inferior therefore
368 may have a need to know when the inferior is in a syscall. This
369 is a count of the number of inferior threads which are known to
370 currently be running in a syscall. */
371 static int number_of_threads_in_syscalls
;
373 /* This is a cached copy of the pid/waitstatus of the last event
374 returned by target_wait()/target_wait_hook(). This information is
375 returned by get_last_target_status(). */
376 static ptid_t target_last_wait_ptid
;
377 static struct target_waitstatus target_last_waitstatus
;
379 /* This is used to remember when a fork, vfork or exec event
380 was caught by a catchpoint, and thus the event is to be
381 followed at the next resume of the inferior, and not
385 enum target_waitkind kind
;
395 char *execd_pathname
;
399 /* Some platforms don't allow us to do anything meaningful with a
400 vforked child until it has exec'd. Vforked processes on such
401 platforms can only be followed after they've exec'd.
403 When this is set to 0, a vfork can be immediately followed,
404 and an exec can be followed merely as an exec. When this is
405 set to 1, a vfork event has been seen, but cannot be followed
406 until the exec is seen.
408 (In the latter case, inferior_ptid is still the parent of the
409 vfork, and pending_follow.fork_event.child_pid is the child. The
410 appropriate process is followed, according to the setting of
411 follow-fork-mode.) */
412 static int follow_vfork_when_exec
;
414 static const char follow_fork_mode_ask
[] = "ask";
415 static const char follow_fork_mode_both
[] = "both";
416 static const char follow_fork_mode_child
[] = "child";
417 static const char follow_fork_mode_parent
[] = "parent";
419 static const char *follow_fork_mode_kind_names
[] =
421 follow_fork_mode_ask
,
422 /* ??rehrauer: The "both" option is broken, by what may be a 10.20
423 kernel problem. It's also not terribly useful without a GUI to
424 help the user drive two debuggers. So for now, I'm disabling the
426 /* follow_fork_mode_both, */
427 follow_fork_mode_child
,
428 follow_fork_mode_parent
,
432 static const char *follow_fork_mode_string
= follow_fork_mode_parent
;
436 follow_inferior_fork (int parent_pid
, int child_pid
, int has_forked
,
439 int followed_parent
= 0;
440 int followed_child
= 0;
442 /* Which process did the user want us to follow? */
443 const char *follow_mode
= follow_fork_mode_string
;
445 /* Or, did the user not know, and want us to ask? */
446 if (follow_fork_mode_string
== follow_fork_mode_ask
)
448 internal_error (__FILE__
, __LINE__
,
449 "follow_inferior_fork: \"ask\" mode not implemented");
450 /* follow_mode = follow_fork_mode_...; */
453 /* If we're to be following the parent, then detach from child_pid.
454 We're already following the parent, so need do nothing explicit
456 if (follow_mode
== follow_fork_mode_parent
)
460 /* We're already attached to the parent, by default. */
462 /* Before detaching from the child, remove all breakpoints from
463 it. (This won't actually modify the breakpoint list, but will
464 physically remove the breakpoints from the child.) */
465 if (!has_vforked
|| !follow_vfork_when_exec
)
467 detach_breakpoints (child_pid
);
468 #ifdef SOLIB_REMOVE_INFERIOR_HOOK
469 SOLIB_REMOVE_INFERIOR_HOOK (child_pid
);
473 /* Detach from the child. */
476 target_require_detach (child_pid
, "", 1);
479 /* If we're to be following the child, then attach to it, detach
480 from inferior_ptid, and set inferior_ptid to child_pid. */
481 else if (follow_mode
== follow_fork_mode_child
)
483 char child_pid_spelling
[100]; /* Arbitrary length. */
487 /* Before detaching from the parent, detach all breakpoints from
488 the child. But only if we're forking, or if we follow vforks
489 as soon as they happen. (If we're following vforks only when
490 the child has exec'd, then it's very wrong to try to write
491 back the "shadow contents" of inserted breakpoints now -- they
492 belong to the child's pre-exec'd a.out.) */
493 if (!has_vforked
|| !follow_vfork_when_exec
)
495 detach_breakpoints (child_pid
);
498 /* Before detaching from the parent, remove all breakpoints from it. */
499 remove_breakpoints ();
501 /* Also reset the solib inferior hook from the parent. */
502 #ifdef SOLIB_REMOVE_INFERIOR_HOOK
503 SOLIB_REMOVE_INFERIOR_HOOK (PIDGET (inferior_ptid
));
506 /* Detach from the parent. */
508 target_detach (NULL
, 1);
510 /* Attach to the child. */
511 inferior_ptid
= pid_to_ptid (child_pid
);
512 sprintf (child_pid_spelling
, "%d", child_pid
);
515 target_require_attach (child_pid_spelling
, 1);
517 /* Was there a step_resume breakpoint? (There was if the user
518 did a "next" at the fork() call.) If so, explicitly reset its
521 step_resumes are a form of bp that are made to be per-thread.
522 Since we created the step_resume bp when the parent process
523 was being debugged, and now are switching to the child process,
524 from the breakpoint package's viewpoint, that's a switch of
525 "threads". We must update the bp's notion of which thread
526 it is for, or it'll be ignored when it triggers... */
527 if (step_resume_breakpoint
&&
528 (!has_vforked
|| !follow_vfork_when_exec
))
529 breakpoint_re_set_thread (step_resume_breakpoint
);
531 /* Reinsert all breakpoints in the child. (The user may've set
532 breakpoints after catching the fork, in which case those
533 actually didn't get set in the child, but only in the parent.) */
534 if (!has_vforked
|| !follow_vfork_when_exec
)
536 breakpoint_re_set ();
537 insert_breakpoints ();
541 /* If we're to be following both parent and child, then fork ourselves,
542 and attach the debugger clone to the child. */
543 else if (follow_mode
== follow_fork_mode_both
)
545 char pid_suffix
[100]; /* Arbitrary length. */
547 /* Clone ourselves to follow the child. This is the end of our
548 involvement with child_pid; our clone will take it from here... */
550 target_clone_and_follow_inferior (child_pid
, &followed_child
);
551 followed_parent
= !followed_child
;
553 /* We continue to follow the parent. To help distinguish the two
554 debuggers, though, both we and our clone will reset our prompts. */
555 sprintf (pid_suffix
, "[%d] ", PIDGET (inferior_ptid
));
556 set_prompt (strcat (get_prompt (), pid_suffix
));
559 /* The parent and child of a vfork share the same address space.
560 Also, on some targets the order in which vfork and exec events
561 are received for parent in child requires some delicate handling
564 For instance, on ptrace-based HPUX we receive the child's vfork
565 event first, at which time the parent has been suspended by the
566 OS and is essentially untouchable until the child's exit or second
567 exec event arrives. At that time, the parent's vfork event is
568 delivered to us, and that's when we see and decide how to follow
569 the vfork. But to get to that point, we must continue the child
570 until it execs or exits. To do that smoothly, all breakpoints
571 must be removed from the child, in case there are any set between
572 the vfork() and exec() calls. But removing them from the child
573 also removes them from the parent, due to the shared-address-space
574 nature of a vfork'd parent and child. On HPUX, therefore, we must
575 take care to restore the bp's to the parent before we continue it.
576 Else, it's likely that we may not stop in the expected place. (The
577 worst scenario is when the user tries to step over a vfork() call;
578 the step-resume bp must be restored for the step to properly stop
579 in the parent after the call completes!)
581 Sequence of events, as reported to gdb from HPUX:
583 Parent Child Action for gdb to take
584 -------------------------------------------------------
585 1 VFORK Continue child
591 target_post_follow_vfork (parent_pid
,
597 pending_follow
.fork_event
.saw_parent_fork
= 0;
598 pending_follow
.fork_event
.saw_child_fork
= 0;
602 follow_fork (int parent_pid
, int child_pid
)
604 follow_inferior_fork (parent_pid
, child_pid
, 1, 0);
608 /* Forward declaration. */
609 static void follow_exec (int, char *);
612 follow_vfork (int parent_pid
, int child_pid
)
614 follow_inferior_fork (parent_pid
, child_pid
, 0, 1);
616 /* Did we follow the child? Had it exec'd before we saw the parent vfork? */
617 if (pending_follow
.fork_event
.saw_child_exec
618 && (PIDGET (inferior_ptid
) == child_pid
))
620 pending_follow
.fork_event
.saw_child_exec
= 0;
621 pending_follow
.kind
= TARGET_WAITKIND_SPURIOUS
;
622 follow_exec (PIDGET (inferior_ptid
), pending_follow
.execd_pathname
);
623 xfree (pending_follow
.execd_pathname
);
627 /* EXECD_PATHNAME is assumed to be non-NULL. */
630 follow_exec (int pid
, char *execd_pathname
)
633 struct target_ops
*tgt
;
635 if (!may_follow_exec
)
638 /* Did this exec() follow a vfork()? If so, we must follow the
639 vfork now too. Do it before following the exec. */
640 if (follow_vfork_when_exec
&&
641 (pending_follow
.kind
== TARGET_WAITKIND_VFORKED
))
643 pending_follow
.kind
= TARGET_WAITKIND_SPURIOUS
;
644 follow_vfork (PIDGET (inferior_ptid
),
645 pending_follow
.fork_event
.child_pid
);
646 follow_vfork_when_exec
= 0;
647 saved_pid
= PIDGET (inferior_ptid
);
649 /* Did we follow the parent? If so, we're done. If we followed
650 the child then we must also follow its exec(). */
651 if (PIDGET (inferior_ptid
) == pending_follow
.fork_event
.parent_pid
)
655 /* This is an exec event that we actually wish to pay attention to.
656 Refresh our symbol table to the newly exec'd program, remove any
659 If there are breakpoints, they aren't really inserted now,
660 since the exec() transformed our inferior into a fresh set
663 We want to preserve symbolic breakpoints on the list, since
664 we have hopes that they can be reset after the new a.out's
665 symbol table is read.
667 However, any "raw" breakpoints must be removed from the list
668 (e.g., the solib bp's), since their address is probably invalid
671 And, we DON'T want to call delete_breakpoints() here, since
672 that may write the bp's "shadow contents" (the instruction
673 value that was overwritten witha TRAP instruction). Since
674 we now have a new a.out, those shadow contents aren't valid. */
675 update_breakpoints_after_exec ();
677 /* If there was one, it's gone now. We cannot truly step-to-next
678 statement through an exec(). */
679 step_resume_breakpoint
= NULL
;
680 step_range_start
= 0;
683 /* If there was one, it's gone now. */
684 through_sigtramp_breakpoint
= NULL
;
686 /* What is this a.out's name? */
687 printf_unfiltered ("Executing new program: %s\n", execd_pathname
);
689 /* We've followed the inferior through an exec. Therefore, the
690 inferior has essentially been killed & reborn. */
692 /* First collect the run target in effect. */
693 tgt
= find_run_target ();
694 /* If we can't find one, things are in a very strange state... */
696 error ("Could find run target to save before following exec");
698 gdb_flush (gdb_stdout
);
699 target_mourn_inferior ();
700 inferior_ptid
= pid_to_ptid (saved_pid
);
701 /* Because mourn_inferior resets inferior_ptid. */
704 /* That a.out is now the one to use. */
705 exec_file_attach (execd_pathname
, 0);
707 /* And also is where symbols can be found. */
708 symbol_file_add_main (execd_pathname
, 0);
710 /* Reset the shared library package. This ensures that we get
711 a shlib event when the child reaches "_start", at which point
712 the dld will have had a chance to initialize the child. */
713 #if defined(SOLIB_RESTART)
716 #ifdef SOLIB_CREATE_INFERIOR_HOOK
717 SOLIB_CREATE_INFERIOR_HOOK (PIDGET (inferior_ptid
));
720 /* Reinsert all breakpoints. (Those which were symbolic have
721 been reset to the proper address in the new a.out, thanks
722 to symbol_file_command...) */
723 insert_breakpoints ();
725 /* The next resume of this inferior should bring it to the shlib
726 startup breakpoints. (If the user had also set bp's on
727 "main" from the old (parent) process, then they'll auto-
728 matically get reset there in the new process.) */
731 /* Non-zero if we just simulating a single-step. This is needed
732 because we cannot remove the breakpoints in the inferior process
733 until after the `wait' in `wait_for_inferior'. */
734 static int singlestep_breakpoints_inserted_p
= 0;
737 /* Things to clean up if we QUIT out of resume (). */
740 resume_cleanups (void *ignore
)
745 static const char schedlock_off
[] = "off";
746 static const char schedlock_on
[] = "on";
747 static const char schedlock_step
[] = "step";
748 static const char *scheduler_mode
= schedlock_off
;
749 static const char *scheduler_enums
[] =
758 set_schedlock_func (char *args
, int from_tty
, struct cmd_list_element
*c
)
760 if (c
->type
== set_cmd
)
761 if (!target_can_lock_scheduler
)
763 scheduler_mode
= schedlock_off
;
764 error ("Target '%s' cannot support this command.",
770 /* Resume the inferior, but allow a QUIT. This is useful if the user
771 wants to interrupt some lengthy single-stepping operation
772 (for child processes, the SIGINT goes to the inferior, and so
773 we get a SIGINT random_signal, but for remote debugging and perhaps
774 other targets, that's not true).
776 STEP nonzero if we should step (zero to continue instead).
777 SIG is the signal to give the inferior (zero for none). */
779 resume (int step
, enum target_signal sig
)
781 int should_resume
= 1;
782 struct cleanup
*old_cleanups
= make_cleanup (resume_cleanups
, 0);
785 /* FIXME: calling breakpoint_here_p (read_pc ()) three times! */
788 /* Some targets (e.g. Solaris x86) have a kernel bug when stepping
789 over an instruction that causes a page fault without triggering
790 a hardware watchpoint. The kernel properly notices that it shouldn't
791 stop, because the hardware watchpoint is not triggered, but it forgets
792 the step request and continues the program normally.
793 Work around the problem by removing hardware watchpoints if a step is
794 requested, GDB will check for a hardware watchpoint trigger after the
796 if (CANNOT_STEP_HW_WATCHPOINTS
&& step
&& breakpoints_inserted
)
797 remove_hw_watchpoints ();
800 /* Normally, by the time we reach `resume', the breakpoints are either
801 removed or inserted, as appropriate. The exception is if we're sitting
802 at a permanent breakpoint; we need to step over it, but permanent
803 breakpoints can't be removed. So we have to test for it here. */
804 if (breakpoint_here_p (read_pc ()) == permanent_breakpoint_here
)
805 SKIP_PERMANENT_BREAKPOINT ();
807 if (SOFTWARE_SINGLE_STEP_P () && step
)
809 /* Do it the hard way, w/temp breakpoints */
810 SOFTWARE_SINGLE_STEP (sig
, 1 /*insert-breakpoints */ );
811 /* ...and don't ask hardware to do it. */
813 /* and do not pull these breakpoints until after a `wait' in
814 `wait_for_inferior' */
815 singlestep_breakpoints_inserted_p
= 1;
818 /* Handle any optimized stores to the inferior NOW... */
819 #ifdef DO_DEFERRED_STORES
823 /* If there were any forks/vforks/execs that were caught and are
824 now to be followed, then do so. */
825 switch (pending_follow
.kind
)
827 case (TARGET_WAITKIND_FORKED
):
828 pending_follow
.kind
= TARGET_WAITKIND_SPURIOUS
;
829 follow_fork (PIDGET (inferior_ptid
),
830 pending_follow
.fork_event
.child_pid
);
833 case (TARGET_WAITKIND_VFORKED
):
835 int saw_child_exec
= pending_follow
.fork_event
.saw_child_exec
;
837 pending_follow
.kind
= TARGET_WAITKIND_SPURIOUS
;
838 follow_vfork (PIDGET (inferior_ptid
),
839 pending_follow
.fork_event
.child_pid
);
841 /* Did we follow the child, but not yet see the child's exec event?
842 If so, then it actually ought to be waiting for us; we respond to
843 parent vfork events. We don't actually want to resume the child
844 in this situation; we want to just get its exec event. */
845 if (!saw_child_exec
&&
846 (PIDGET (inferior_ptid
) == pending_follow
.fork_event
.child_pid
))
851 case (TARGET_WAITKIND_EXECD
):
852 /* If we saw a vfork event but couldn't follow it until we saw
853 an exec, then now might be the time! */
854 pending_follow
.kind
= TARGET_WAITKIND_SPURIOUS
;
855 /* follow_exec is called as soon as the exec event is seen. */
862 /* Install inferior's terminal modes. */
863 target_terminal_inferior ();
869 resume_ptid
= RESUME_ALL
; /* Default */
871 if ((step
|| singlestep_breakpoints_inserted_p
) &&
872 !breakpoints_inserted
&& breakpoint_here_p (read_pc ()))
874 /* Stepping past a breakpoint without inserting breakpoints.
875 Make sure only the current thread gets to step, so that
876 other threads don't sneak past breakpoints while they are
879 resume_ptid
= inferior_ptid
;
882 if ((scheduler_mode
== schedlock_on
) ||
883 (scheduler_mode
== schedlock_step
&&
884 (step
|| singlestep_breakpoints_inserted_p
)))
886 /* User-settable 'scheduler' mode requires solo thread resume. */
887 resume_ptid
= inferior_ptid
;
890 #ifdef CANNOT_STEP_BREAKPOINT
891 /* Most targets can step a breakpoint instruction, thus executing it
892 normally. But if this one cannot, just continue and we will hit
894 if (step
&& breakpoints_inserted
&& breakpoint_here_p (read_pc ()))
897 target_resume (resume_ptid
, step
, sig
);
900 discard_cleanups (old_cleanups
);
904 /* Clear out all variables saying what to do when inferior is continued.
905 First do this, then set the ones you want, then call `proceed'. */
908 clear_proceed_status (void)
911 step_range_start
= 0;
913 step_frame_address
= 0;
914 step_over_calls
= STEP_OVER_UNDEBUGGABLE
;
916 stop_soon_quietly
= 0;
917 proceed_to_finish
= 0;
918 breakpoint_proceeded
= 1; /* We're about to proceed... */
920 /* Discard any remaining commands or status from previous stop. */
921 bpstat_clear (&stop_bpstat
);
924 /* Basic routine for continuing the program in various fashions.
926 ADDR is the address to resume at, or -1 for resume where stopped.
927 SIGGNAL is the signal to give it, or 0 for none,
928 or -1 for act according to how it stopped.
929 STEP is nonzero if should trap after one instruction.
930 -1 means return after that and print nothing.
931 You should probably set various step_... variables
932 before calling here, if you are stepping.
934 You should call clear_proceed_status before calling proceed. */
937 proceed (CORE_ADDR addr
, enum target_signal siggnal
, int step
)
942 step_start_function
= find_pc_function (read_pc ());
946 if (addr
== (CORE_ADDR
) -1)
948 /* If there is a breakpoint at the address we will resume at,
949 step one instruction before inserting breakpoints
950 so that we do not stop right away (and report a second
951 hit at this breakpoint). */
953 if (read_pc () == stop_pc
&& breakpoint_here_p (read_pc ()))
956 #ifndef STEP_SKIPS_DELAY
957 #define STEP_SKIPS_DELAY(pc) (0)
958 #define STEP_SKIPS_DELAY_P (0)
960 /* Check breakpoint_here_p first, because breakpoint_here_p is fast
961 (it just checks internal GDB data structures) and STEP_SKIPS_DELAY
962 is slow (it needs to read memory from the target). */
963 if (STEP_SKIPS_DELAY_P
964 && breakpoint_here_p (read_pc () + 4)
965 && STEP_SKIPS_DELAY (read_pc ()))
973 #ifdef PREPARE_TO_PROCEED
974 /* In a multi-threaded task we may select another thread
975 and then continue or step.
977 But if the old thread was stopped at a breakpoint, it
978 will immediately cause another breakpoint stop without
979 any execution (i.e. it will report a breakpoint hit
980 incorrectly). So we must step over it first.
982 PREPARE_TO_PROCEED checks the current thread against the thread
983 that reported the most recent event. If a step-over is required
984 it returns TRUE and sets the current thread to the old thread. */
985 if (PREPARE_TO_PROCEED (1) && breakpoint_here_p (read_pc ()))
990 #endif /* PREPARE_TO_PROCEED */
993 if (trap_expected_after_continue
)
995 /* If (step == 0), a trap will be automatically generated after
996 the first instruction is executed. Force step one
997 instruction to clear this condition. This should not occur
998 if step is nonzero, but it is harmless in that case. */
1000 trap_expected_after_continue
= 0;
1002 #endif /* HP_OS_BUG */
1005 /* We will get a trace trap after one instruction.
1006 Continue it automatically and insert breakpoints then. */
1010 int temp
= insert_breakpoints ();
1013 print_sys_errmsg ("insert_breakpoints", temp
);
1014 error ("Cannot insert breakpoints.\n\
1015 The same program may be running in another process,\n\
1016 or you may have requested too many hardware\n\
1017 breakpoints and/or watchpoints.\n");
1020 breakpoints_inserted
= 1;
1023 if (siggnal
!= TARGET_SIGNAL_DEFAULT
)
1024 stop_signal
= siggnal
;
1025 /* If this signal should not be seen by program,
1026 give it zero. Used for debugging signals. */
1027 else if (!signal_program
[stop_signal
])
1028 stop_signal
= TARGET_SIGNAL_0
;
1030 annotate_starting ();
1032 /* Make sure that output from GDB appears before output from the
1034 gdb_flush (gdb_stdout
);
1036 /* Resume inferior. */
1037 resume (oneproc
|| step
|| bpstat_should_step (), stop_signal
);
1039 /* Wait for it to stop (if not standalone)
1040 and in any case decode why it stopped, and act accordingly. */
1041 /* Do this only if we are not using the event loop, or if the target
1042 does not support asynchronous execution. */
1043 if (!event_loop_p
|| !target_can_async_p ())
1045 wait_for_inferior ();
1050 /* Record the pc and sp of the program the last time it stopped.
1051 These are just used internally by wait_for_inferior, but need
1052 to be preserved over calls to it and cleared when the inferior
1054 static CORE_ADDR prev_pc
;
1055 static CORE_ADDR prev_func_start
;
1056 static char *prev_func_name
;
1059 /* Start remote-debugging of a machine over a serial link. */
1064 init_thread_list ();
1065 init_wait_for_inferior ();
1066 stop_soon_quietly
= 1;
1069 /* Always go on waiting for the target, regardless of the mode. */
1070 /* FIXME: cagney/1999-09-23: At present it isn't possible to
1071 indicate to wait_for_inferior that a target should timeout if
1072 nothing is returned (instead of just blocking). Because of this,
1073 targets expecting an immediate response need to, internally, set
1074 things up so that the target_wait() is forced to eventually
1076 /* FIXME: cagney/1999-09-24: It isn't possible for target_open() to
1077 differentiate to its caller what the state of the target is after
1078 the initial open has been performed. Here we're assuming that
1079 the target has stopped. It should be possible to eventually have
1080 target_open() return to the caller an indication that the target
1081 is currently running and GDB state should be set to the same as
1082 for an async run. */
1083 wait_for_inferior ();
1087 /* Initialize static vars when a new inferior begins. */
1090 init_wait_for_inferior (void)
1092 /* These are meaningless until the first time through wait_for_inferior. */
1094 prev_func_start
= 0;
1095 prev_func_name
= NULL
;
1098 trap_expected_after_continue
= 0;
1100 breakpoints_inserted
= 0;
1101 breakpoint_init_inferior (inf_starting
);
1103 /* Don't confuse first call to proceed(). */
1104 stop_signal
= TARGET_SIGNAL_0
;
1106 /* The first resume is not following a fork/vfork/exec. */
1107 pending_follow
.kind
= TARGET_WAITKIND_SPURIOUS
; /* I.e., none. */
1108 pending_follow
.fork_event
.saw_parent_fork
= 0;
1109 pending_follow
.fork_event
.saw_child_fork
= 0;
1110 pending_follow
.fork_event
.saw_child_exec
= 0;
1112 /* See wait_for_inferior's handling of SYSCALL_ENTRY/RETURN events. */
1113 number_of_threads_in_syscalls
= 0;
1115 clear_proceed_status ();
1119 delete_breakpoint_current_contents (void *arg
)
1121 struct breakpoint
**breakpointp
= (struct breakpoint
**) arg
;
1122 if (*breakpointp
!= NULL
)
1124 delete_breakpoint (*breakpointp
);
1125 *breakpointp
= NULL
;
1129 /* This enum encodes possible reasons for doing a target_wait, so that
1130 wfi can call target_wait in one place. (Ultimately the call will be
1131 moved out of the infinite loop entirely.) */
1135 infwait_normal_state
,
1136 infwait_thread_hop_state
,
1137 infwait_nullified_state
,
1138 infwait_nonstep_watch_state
1141 /* Why did the inferior stop? Used to print the appropriate messages
1142 to the interface from within handle_inferior_event(). */
1143 enum inferior_stop_reason
1145 /* We don't know why. */
1147 /* Step, next, nexti, stepi finished. */
1149 /* Found breakpoint. */
1151 /* Inferior terminated by signal. */
1153 /* Inferior exited. */
1155 /* Inferior received signal, and user asked to be notified. */
1159 /* This structure contains what used to be local variables in
1160 wait_for_inferior. Probably many of them can return to being
1161 locals in handle_inferior_event. */
1163 struct execution_control_state
1165 struct target_waitstatus ws
;
1166 struct target_waitstatus
*wp
;
1169 CORE_ADDR stop_func_start
;
1170 CORE_ADDR stop_func_end
;
1171 char *stop_func_name
;
1172 struct symtab_and_line sal
;
1173 int remove_breakpoints_on_following_step
;
1175 struct symtab
*current_symtab
;
1176 int handling_longjmp
; /* FIXME */
1178 ptid_t saved_inferior_ptid
;
1180 int stepping_through_solib_after_catch
;
1181 bpstat stepping_through_solib_catchpoints
;
1182 int enable_hw_watchpoints_after_wait
;
1183 int stepping_through_sigtramp
;
1184 int new_thread_event
;
1185 struct target_waitstatus tmpstatus
;
1186 enum infwait_states infwait_state
;
1191 void init_execution_control_state (struct execution_control_state
* ecs
);
1193 void handle_inferior_event (struct execution_control_state
* ecs
);
1195 static void check_sigtramp2 (struct execution_control_state
*ecs
);
1196 static void step_into_function (struct execution_control_state
*ecs
);
1197 static void step_over_function (struct execution_control_state
*ecs
);
1198 static void stop_stepping (struct execution_control_state
*ecs
);
1199 static void prepare_to_wait (struct execution_control_state
*ecs
);
1200 static void keep_going (struct execution_control_state
*ecs
);
1201 static void print_stop_reason (enum inferior_stop_reason stop_reason
, int stop_info
);
1203 /* Wait for control to return from inferior to debugger.
1204 If inferior gets a signal, we may decide to start it up again
1205 instead of returning. That is why there is a loop in this function.
1206 When this function actually returns it means the inferior
1207 should be left stopped and GDB should read more commands. */
1210 wait_for_inferior (void)
1212 struct cleanup
*old_cleanups
;
1213 struct execution_control_state ecss
;
1214 struct execution_control_state
*ecs
;
1216 old_cleanups
= make_cleanup (delete_step_resume_breakpoint
,
1217 &step_resume_breakpoint
);
1218 make_cleanup (delete_breakpoint_current_contents
,
1219 &through_sigtramp_breakpoint
);
1221 /* wfi still stays in a loop, so it's OK just to take the address of
1222 a local to get the ecs pointer. */
1225 /* Fill in with reasonable starting values. */
1226 init_execution_control_state (ecs
);
1228 /* We'll update this if & when we switch to a new thread. */
1229 previous_inferior_ptid
= inferior_ptid
;
1231 overlay_cache_invalid
= 1;
1233 /* We have to invalidate the registers BEFORE calling target_wait
1234 because they can be loaded from the target while in target_wait.
1235 This makes remote debugging a bit more efficient for those
1236 targets that provide critical registers as part of their normal
1237 status mechanism. */
1239 registers_changed ();
1243 if (target_wait_hook
)
1244 ecs
->ptid
= target_wait_hook (ecs
->waiton_ptid
, ecs
->wp
);
1246 ecs
->ptid
= target_wait (ecs
->waiton_ptid
, ecs
->wp
);
1248 /* Now figure out what to do with the result of the result. */
1249 handle_inferior_event (ecs
);
1251 if (!ecs
->wait_some_more
)
1254 do_cleanups (old_cleanups
);
1257 /* Asynchronous version of wait_for_inferior. It is called by the
1258 event loop whenever a change of state is detected on the file
1259 descriptor corresponding to the target. It can be called more than
1260 once to complete a single execution command. In such cases we need
1261 to keep the state in a global variable ASYNC_ECSS. If it is the
1262 last time that this function is called for a single execution
1263 command, then report to the user that the inferior has stopped, and
1264 do the necessary cleanups. */
1266 struct execution_control_state async_ecss
;
1267 struct execution_control_state
*async_ecs
;
1270 fetch_inferior_event (void *client_data
)
1272 static struct cleanup
*old_cleanups
;
1274 async_ecs
= &async_ecss
;
1276 if (!async_ecs
->wait_some_more
)
1278 old_cleanups
= make_exec_cleanup (delete_step_resume_breakpoint
,
1279 &step_resume_breakpoint
);
1280 make_exec_cleanup (delete_breakpoint_current_contents
,
1281 &through_sigtramp_breakpoint
);
1283 /* Fill in with reasonable starting values. */
1284 init_execution_control_state (async_ecs
);
1286 /* We'll update this if & when we switch to a new thread. */
1287 previous_inferior_ptid
= inferior_ptid
;
1289 overlay_cache_invalid
= 1;
1291 /* We have to invalidate the registers BEFORE calling target_wait
1292 because they can be loaded from the target while in target_wait.
1293 This makes remote debugging a bit more efficient for those
1294 targets that provide critical registers as part of their normal
1295 status mechanism. */
1297 registers_changed ();
1300 if (target_wait_hook
)
1301 async_ecs
->ptid
= target_wait_hook (async_ecs
->waiton_ptid
, async_ecs
->wp
);
1303 async_ecs
->ptid
= target_wait (async_ecs
->waiton_ptid
, async_ecs
->wp
);
1305 /* Now figure out what to do with the result of the result. */
1306 handle_inferior_event (async_ecs
);
1308 if (!async_ecs
->wait_some_more
)
1310 /* Do only the cleanups that have been added by this
1311 function. Let the continuations for the commands do the rest,
1312 if there are any. */
1313 do_exec_cleanups (old_cleanups
);
1315 if (step_multi
&& stop_step
)
1316 inferior_event_handler (INF_EXEC_CONTINUE
, NULL
);
1318 inferior_event_handler (INF_EXEC_COMPLETE
, NULL
);
1322 /* Prepare an execution control state for looping through a
1323 wait_for_inferior-type loop. */
1326 init_execution_control_state (struct execution_control_state
*ecs
)
1328 /* ecs->another_trap? */
1329 ecs
->random_signal
= 0;
1330 ecs
->remove_breakpoints_on_following_step
= 0;
1331 ecs
->handling_longjmp
= 0; /* FIXME */
1332 ecs
->update_step_sp
= 0;
1333 ecs
->stepping_through_solib_after_catch
= 0;
1334 ecs
->stepping_through_solib_catchpoints
= NULL
;
1335 ecs
->enable_hw_watchpoints_after_wait
= 0;
1336 ecs
->stepping_through_sigtramp
= 0;
1337 ecs
->sal
= find_pc_line (prev_pc
, 0);
1338 ecs
->current_line
= ecs
->sal
.line
;
1339 ecs
->current_symtab
= ecs
->sal
.symtab
;
1340 ecs
->infwait_state
= infwait_normal_state
;
1341 ecs
->waiton_ptid
= pid_to_ptid (-1);
1342 ecs
->wp
= &(ecs
->ws
);
1345 /* Call this function before setting step_resume_breakpoint, as a
1346 sanity check. There should never be more than one step-resume
1347 breakpoint per thread, so we should never be setting a new
1348 step_resume_breakpoint when one is already active. */
1350 check_for_old_step_resume_breakpoint (void)
1352 if (step_resume_breakpoint
)
1353 warning ("GDB bug: infrun.c (wait_for_inferior): dropping old step_resume breakpoint");
1356 /* Return the cached copy of the last pid/waitstatus returned by
1357 target_wait()/target_wait_hook(). The data is actually cached by
1358 handle_inferior_event(), which gets called immediately after
1359 target_wait()/target_wait_hook(). */
1362 get_last_target_status(ptid_t
*ptidp
, struct target_waitstatus
*status
)
1364 *ptidp
= target_last_wait_ptid
;
1365 *status
= target_last_waitstatus
;
1368 /* Switch thread contexts, maintaining "infrun state". */
1371 context_switch (struct execution_control_state
*ecs
)
1373 /* Caution: it may happen that the new thread (or the old one!)
1374 is not in the thread list. In this case we must not attempt
1375 to "switch context", or we run the risk that our context may
1376 be lost. This may happen as a result of the target module
1377 mishandling thread creation. */
1379 if (in_thread_list (inferior_ptid
) && in_thread_list (ecs
->ptid
))
1380 { /* Perform infrun state context switch: */
1381 /* Save infrun state for the old thread. */
1382 save_infrun_state (inferior_ptid
, prev_pc
,
1383 prev_func_start
, prev_func_name
,
1384 trap_expected
, step_resume_breakpoint
,
1385 through_sigtramp_breakpoint
, step_range_start
,
1386 step_range_end
, step_frame_address
,
1387 ecs
->handling_longjmp
, ecs
->another_trap
,
1388 ecs
->stepping_through_solib_after_catch
,
1389 ecs
->stepping_through_solib_catchpoints
,
1390 ecs
->stepping_through_sigtramp
,
1391 ecs
->current_line
, ecs
->current_symtab
,
1394 /* Load infrun state for the new thread. */
1395 load_infrun_state (ecs
->ptid
, &prev_pc
,
1396 &prev_func_start
, &prev_func_name
,
1397 &trap_expected
, &step_resume_breakpoint
,
1398 &through_sigtramp_breakpoint
, &step_range_start
,
1399 &step_range_end
, &step_frame_address
,
1400 &ecs
->handling_longjmp
, &ecs
->another_trap
,
1401 &ecs
->stepping_through_solib_after_catch
,
1402 &ecs
->stepping_through_solib_catchpoints
,
1403 &ecs
->stepping_through_sigtramp
,
1404 &ecs
->current_line
, &ecs
->current_symtab
,
1407 inferior_ptid
= ecs
->ptid
;
1411 /* Given an execution control state that has been freshly filled in
1412 by an event from the inferior, figure out what it means and take
1413 appropriate action. */
1416 handle_inferior_event (struct execution_control_state
*ecs
)
1419 int stepped_after_stopped_by_watchpoint
;
1421 /* Cache the last pid/waitstatus. */
1422 target_last_wait_ptid
= ecs
->ptid
;
1423 target_last_waitstatus
= *ecs
->wp
;
1425 /* Keep this extra brace for now, minimizes diffs. */
1427 switch (ecs
->infwait_state
)
1429 case infwait_thread_hop_state
:
1430 /* Cancel the waiton_ptid. */
1431 ecs
->waiton_ptid
= pid_to_ptid (-1);
1432 /* Fall thru to the normal_state case. */
1434 case infwait_normal_state
:
1435 /* See comments where a TARGET_WAITKIND_SYSCALL_RETURN event
1436 is serviced in this loop, below. */
1437 if (ecs
->enable_hw_watchpoints_after_wait
)
1439 TARGET_ENABLE_HW_WATCHPOINTS (PIDGET (inferior_ptid
));
1440 ecs
->enable_hw_watchpoints_after_wait
= 0;
1442 stepped_after_stopped_by_watchpoint
= 0;
1445 case infwait_nullified_state
:
1448 case infwait_nonstep_watch_state
:
1449 insert_breakpoints ();
1451 /* FIXME-maybe: is this cleaner than setting a flag? Does it
1452 handle things like signals arriving and other things happening
1453 in combination correctly? */
1454 stepped_after_stopped_by_watchpoint
= 1;
1457 ecs
->infwait_state
= infwait_normal_state
;
1459 flush_cached_frames ();
1461 /* If it's a new process, add it to the thread database */
1463 ecs
->new_thread_event
= (! ptid_equal (ecs
->ptid
, inferior_ptid
)
1464 && ! in_thread_list (ecs
->ptid
));
1466 if (ecs
->ws
.kind
!= TARGET_WAITKIND_EXITED
1467 && ecs
->ws
.kind
!= TARGET_WAITKIND_SIGNALLED
1468 && ecs
->new_thread_event
)
1470 add_thread (ecs
->ptid
);
1473 ui_out_text (uiout
, "[New ");
1474 ui_out_text (uiout
, target_pid_or_tid_to_str (ecs
->ptid
));
1475 ui_out_text (uiout
, "]\n");
1477 printf_filtered ("[New %s]\n", target_pid_or_tid_to_str (ecs
->ptid
));
1481 /* NOTE: This block is ONLY meant to be invoked in case of a
1482 "thread creation event"! If it is invoked for any other
1483 sort of event (such as a new thread landing on a breakpoint),
1484 the event will be discarded, which is almost certainly
1487 To avoid this, the low-level module (eg. target_wait)
1488 should call in_thread_list and add_thread, so that the
1489 new thread is known by the time we get here. */
1491 /* We may want to consider not doing a resume here in order
1492 to give the user a chance to play with the new thread.
1493 It might be good to make that a user-settable option. */
1495 /* At this point, all threads are stopped (happens
1496 automatically in either the OS or the native code).
1497 Therefore we need to continue all threads in order to
1500 target_resume (RESUME_ALL
, 0, TARGET_SIGNAL_0
);
1501 prepare_to_wait (ecs
);
1506 switch (ecs
->ws
.kind
)
1508 case TARGET_WAITKIND_LOADED
:
1509 /* Ignore gracefully during startup of the inferior, as it
1510 might be the shell which has just loaded some objects,
1511 otherwise add the symbols for the newly loaded objects. */
1513 if (!stop_soon_quietly
)
1515 /* Remove breakpoints, SOLIB_ADD might adjust
1516 breakpoint addresses via breakpoint_re_set. */
1517 if (breakpoints_inserted
)
1518 remove_breakpoints ();
1520 /* Check for any newly added shared libraries if we're
1521 supposed to be adding them automatically. */
1524 /* Switch terminal for any messages produced by
1525 breakpoint_re_set. */
1526 target_terminal_ours_for_output ();
1527 SOLIB_ADD (NULL
, 0, NULL
);
1528 target_terminal_inferior ();
1531 /* Reinsert breakpoints and continue. */
1532 if (breakpoints_inserted
)
1533 insert_breakpoints ();
1536 resume (0, TARGET_SIGNAL_0
);
1537 prepare_to_wait (ecs
);
1540 case TARGET_WAITKIND_SPURIOUS
:
1541 resume (0, TARGET_SIGNAL_0
);
1542 prepare_to_wait (ecs
);
1545 case TARGET_WAITKIND_EXITED
:
1546 target_terminal_ours (); /* Must do this before mourn anyway */
1547 print_stop_reason (EXITED
, ecs
->ws
.value
.integer
);
1549 /* Record the exit code in the convenience variable $_exitcode, so
1550 that the user can inspect this again later. */
1551 set_internalvar (lookup_internalvar ("_exitcode"),
1552 value_from_longest (builtin_type_int
,
1553 (LONGEST
) ecs
->ws
.value
.integer
));
1554 gdb_flush (gdb_stdout
);
1555 target_mourn_inferior ();
1556 singlestep_breakpoints_inserted_p
= 0; /*SOFTWARE_SINGLE_STEP_P() */
1557 stop_print_frame
= 0;
1558 stop_stepping (ecs
);
1561 case TARGET_WAITKIND_SIGNALLED
:
1562 stop_print_frame
= 0;
1563 stop_signal
= ecs
->ws
.value
.sig
;
1564 target_terminal_ours (); /* Must do this before mourn anyway */
1566 /* Note: By definition of TARGET_WAITKIND_SIGNALLED, we shouldn't
1567 reach here unless the inferior is dead. However, for years
1568 target_kill() was called here, which hints that fatal signals aren't
1569 really fatal on some systems. If that's true, then some changes
1571 target_mourn_inferior ();
1573 print_stop_reason (SIGNAL_EXITED
, stop_signal
);
1574 singlestep_breakpoints_inserted_p
= 0; /*SOFTWARE_SINGLE_STEP_P() */
1575 stop_stepping (ecs
);
1578 /* The following are the only cases in which we keep going;
1579 the above cases end in a continue or goto. */
1580 case TARGET_WAITKIND_FORKED
:
1581 stop_signal
= TARGET_SIGNAL_TRAP
;
1582 pending_follow
.kind
= ecs
->ws
.kind
;
1584 /* Ignore fork events reported for the parent; we're only
1585 interested in reacting to forks of the child. Note that
1586 we expect the child's fork event to be available if we
1587 waited for it now. */
1588 if (ptid_equal (inferior_ptid
, ecs
->ptid
))
1590 pending_follow
.fork_event
.saw_parent_fork
= 1;
1591 pending_follow
.fork_event
.parent_pid
= PIDGET (ecs
->ptid
);
1592 pending_follow
.fork_event
.child_pid
= ecs
->ws
.value
.related_pid
;
1593 prepare_to_wait (ecs
);
1598 pending_follow
.fork_event
.saw_child_fork
= 1;
1599 pending_follow
.fork_event
.child_pid
= PIDGET (ecs
->ptid
);
1600 pending_follow
.fork_event
.parent_pid
= ecs
->ws
.value
.related_pid
;
1603 stop_pc
= read_pc_pid (ecs
->ptid
);
1604 ecs
->saved_inferior_ptid
= inferior_ptid
;
1605 inferior_ptid
= ecs
->ptid
;
1606 /* The second argument of bpstat_stop_status is meant to help
1607 distinguish between a breakpoint trap and a singlestep trap.
1608 This is only important on targets where DECR_PC_AFTER_BREAK
1609 is non-zero. The prev_pc test is meant to distinguish between
1610 singlestepping a trap instruction, and singlestepping thru a
1611 jump to the instruction following a trap instruction. */
1613 stop_bpstat
= bpstat_stop_status (&stop_pc
,
1614 currently_stepping (ecs
) &&
1616 stop_pc
- DECR_PC_AFTER_BREAK
);
1617 ecs
->random_signal
= !bpstat_explains_signal (stop_bpstat
);
1618 inferior_ptid
= ecs
->saved_inferior_ptid
;
1619 goto process_event_stop_test
;
1621 /* If this a platform which doesn't allow a debugger to touch a
1622 vfork'd inferior until after it exec's, then we'd best keep
1623 our fingers entirely off the inferior, other than continuing
1624 it. This has the unfortunate side-effect that catchpoints
1625 of vforks will be ignored. But since the platform doesn't
1626 allow the inferior be touched at vfork time, there's really
1628 case TARGET_WAITKIND_VFORKED
:
1629 stop_signal
= TARGET_SIGNAL_TRAP
;
1630 pending_follow
.kind
= ecs
->ws
.kind
;
1632 /* Is this a vfork of the parent? If so, then give any
1633 vfork catchpoints a chance to trigger now. (It's
1634 dangerous to do so if the child canot be touched until
1635 it execs, and the child has not yet exec'd. We probably
1636 should warn the user to that effect when the catchpoint
1638 if (ptid_equal (ecs
->ptid
, inferior_ptid
))
1640 pending_follow
.fork_event
.saw_parent_fork
= 1;
1641 pending_follow
.fork_event
.parent_pid
= PIDGET (ecs
->ptid
);
1642 pending_follow
.fork_event
.child_pid
= ecs
->ws
.value
.related_pid
;
1645 /* If we've seen the child's vfork event but cannot really touch
1646 the child until it execs, then we must continue the child now.
1647 Else, give any vfork catchpoints a chance to trigger now. */
1650 pending_follow
.fork_event
.saw_child_fork
= 1;
1651 pending_follow
.fork_event
.child_pid
= PIDGET (ecs
->ptid
);
1652 pending_follow
.fork_event
.parent_pid
= ecs
->ws
.value
.related_pid
;
1653 target_post_startup_inferior (
1654 pid_to_ptid (pending_follow
.fork_event
.child_pid
));
1655 follow_vfork_when_exec
= !target_can_follow_vfork_prior_to_exec ();
1656 if (follow_vfork_when_exec
)
1658 target_resume (ecs
->ptid
, 0, TARGET_SIGNAL_0
);
1659 prepare_to_wait (ecs
);
1664 stop_pc
= read_pc ();
1665 /* The second argument of bpstat_stop_status is meant to help
1666 distinguish between a breakpoint trap and a singlestep trap.
1667 This is only important on targets where DECR_PC_AFTER_BREAK
1668 is non-zero. The prev_pc test is meant to distinguish between
1669 singlestepping a trap instruction, and singlestepping thru a
1670 jump to the instruction following a trap instruction. */
1672 stop_bpstat
= bpstat_stop_status (&stop_pc
,
1673 currently_stepping (ecs
) &&
1675 stop_pc
- DECR_PC_AFTER_BREAK
);
1676 ecs
->random_signal
= !bpstat_explains_signal (stop_bpstat
);
1677 goto process_event_stop_test
;
1679 case TARGET_WAITKIND_EXECD
:
1680 stop_signal
= TARGET_SIGNAL_TRAP
;
1682 /* Is this a target which reports multiple exec events per actual
1683 call to exec()? (HP-UX using ptrace does, for example.) If so,
1684 ignore all but the last one. Just resume the exec'r, and wait
1685 for the next exec event. */
1686 if (inferior_ignoring_leading_exec_events
)
1688 inferior_ignoring_leading_exec_events
--;
1689 if (pending_follow
.kind
== TARGET_WAITKIND_VFORKED
)
1690 ENSURE_VFORKING_PARENT_REMAINS_STOPPED (pending_follow
.fork_event
.parent_pid
);
1691 target_resume (ecs
->ptid
, 0, TARGET_SIGNAL_0
);
1692 prepare_to_wait (ecs
);
1695 inferior_ignoring_leading_exec_events
=
1696 target_reported_exec_events_per_exec_call () - 1;
1698 pending_follow
.execd_pathname
=
1699 savestring (ecs
->ws
.value
.execd_pathname
,
1700 strlen (ecs
->ws
.value
.execd_pathname
));
1702 /* Did inferior_ptid exec, or did a (possibly not-yet-followed)
1703 child of a vfork exec?
1705 ??rehrauer: This is unabashedly an HP-UX specific thing. On
1706 HP-UX, events associated with a vforking inferior come in
1707 threes: a vfork event for the child (always first), followed
1708 a vfork event for the parent and an exec event for the child.
1709 The latter two can come in either order.
1711 If we get the parent vfork event first, life's good: We follow
1712 either the parent or child, and then the child's exec event is
1715 But if we get the child's exec event first, then we delay
1716 responding to it until we handle the parent's vfork. Because,
1717 otherwise we can't satisfy a "catch vfork". */
1718 if (pending_follow
.kind
== TARGET_WAITKIND_VFORKED
)
1720 pending_follow
.fork_event
.saw_child_exec
= 1;
1722 /* On some targets, the child must be resumed before
1723 the parent vfork event is delivered. A single-step
1725 if (RESUME_EXECD_VFORKING_CHILD_TO_GET_PARENT_VFORK ())
1726 target_resume (ecs
->ptid
, 1, TARGET_SIGNAL_0
);
1727 /* We expect the parent vfork event to be available now. */
1728 prepare_to_wait (ecs
);
1732 /* This causes the eventpoints and symbol table to be reset. Must
1733 do this now, before trying to determine whether to stop. */
1734 follow_exec (PIDGET (inferior_ptid
), pending_follow
.execd_pathname
);
1735 xfree (pending_follow
.execd_pathname
);
1737 stop_pc
= read_pc_pid (ecs
->ptid
);
1738 ecs
->saved_inferior_ptid
= inferior_ptid
;
1739 inferior_ptid
= ecs
->ptid
;
1740 /* The second argument of bpstat_stop_status is meant to help
1741 distinguish between a breakpoint trap and a singlestep trap.
1742 This is only important on targets where DECR_PC_AFTER_BREAK
1743 is non-zero. The prev_pc test is meant to distinguish between
1744 singlestepping a trap instruction, and singlestepping thru a
1745 jump to the instruction following a trap instruction. */
1747 stop_bpstat
= bpstat_stop_status (&stop_pc
,
1748 currently_stepping (ecs
) &&
1750 stop_pc
- DECR_PC_AFTER_BREAK
);
1751 ecs
->random_signal
= !bpstat_explains_signal (stop_bpstat
);
1752 inferior_ptid
= ecs
->saved_inferior_ptid
;
1753 goto process_event_stop_test
;
1755 /* These syscall events are returned on HP-UX, as part of its
1756 implementation of page-protection-based "hardware" watchpoints.
1757 HP-UX has unfortunate interactions between page-protections and
1758 some system calls. Our solution is to disable hardware watches
1759 when a system call is entered, and reenable them when the syscall
1760 completes. The downside of this is that we may miss the precise
1761 point at which a watched piece of memory is modified. "Oh well."
1763 Note that we may have multiple threads running, which may each
1764 enter syscalls at roughly the same time. Since we don't have a
1765 good notion currently of whether a watched piece of memory is
1766 thread-private, we'd best not have any page-protections active
1767 when any thread is in a syscall. Thus, we only want to reenable
1768 hardware watches when no threads are in a syscall.
1770 Also, be careful not to try to gather much state about a thread
1771 that's in a syscall. It's frequently a losing proposition. */
1772 case TARGET_WAITKIND_SYSCALL_ENTRY
:
1773 number_of_threads_in_syscalls
++;
1774 if (number_of_threads_in_syscalls
== 1)
1776 TARGET_DISABLE_HW_WATCHPOINTS (PIDGET (inferior_ptid
));
1778 resume (0, TARGET_SIGNAL_0
);
1779 prepare_to_wait (ecs
);
1782 /* Before examining the threads further, step this thread to
1783 get it entirely out of the syscall. (We get notice of the
1784 event when the thread is just on the verge of exiting a
1785 syscall. Stepping one instruction seems to get it back
1788 Note that although the logical place to reenable h/w watches
1789 is here, we cannot. We cannot reenable them before stepping
1790 the thread (this causes the next wait on the thread to hang).
1792 Nor can we enable them after stepping until we've done a wait.
1793 Thus, we simply set the flag ecs->enable_hw_watchpoints_after_wait
1794 here, which will be serviced immediately after the target
1796 case TARGET_WAITKIND_SYSCALL_RETURN
:
1797 target_resume (ecs
->ptid
, 1, TARGET_SIGNAL_0
);
1799 if (number_of_threads_in_syscalls
> 0)
1801 number_of_threads_in_syscalls
--;
1802 ecs
->enable_hw_watchpoints_after_wait
=
1803 (number_of_threads_in_syscalls
== 0);
1805 prepare_to_wait (ecs
);
1808 case TARGET_WAITKIND_STOPPED
:
1809 stop_signal
= ecs
->ws
.value
.sig
;
1812 /* We had an event in the inferior, but we are not interested
1813 in handling it at this level. The lower layers have already
1814 done what needs to be done, if anything. This case can
1815 occur only when the target is async or extended-async. One
1816 of the circumstamces for this to happen is when the
1817 inferior produces output for the console. The inferior has
1818 not stopped, and we are ignoring the event. */
1819 case TARGET_WAITKIND_IGNORE
:
1820 ecs
->wait_some_more
= 1;
1824 /* We may want to consider not doing a resume here in order to give
1825 the user a chance to play with the new thread. It might be good
1826 to make that a user-settable option. */
1828 /* At this point, all threads are stopped (happens automatically in
1829 either the OS or the native code). Therefore we need to continue
1830 all threads in order to make progress. */
1831 if (ecs
->new_thread_event
)
1833 target_resume (RESUME_ALL
, 0, TARGET_SIGNAL_0
);
1834 prepare_to_wait (ecs
);
1838 stop_pc
= read_pc_pid (ecs
->ptid
);
1840 /* See if a thread hit a thread-specific breakpoint that was meant for
1841 another thread. If so, then step that thread past the breakpoint,
1844 if (stop_signal
== TARGET_SIGNAL_TRAP
)
1846 if (SOFTWARE_SINGLE_STEP_P () && singlestep_breakpoints_inserted_p
)
1847 ecs
->random_signal
= 0;
1848 else if (breakpoints_inserted
1849 && breakpoint_here_p (stop_pc
- DECR_PC_AFTER_BREAK
))
1851 ecs
->random_signal
= 0;
1852 if (!breakpoint_thread_match (stop_pc
- DECR_PC_AFTER_BREAK
,
1857 /* Saw a breakpoint, but it was hit by the wrong thread.
1859 if (DECR_PC_AFTER_BREAK
)
1860 write_pc_pid (stop_pc
- DECR_PC_AFTER_BREAK
, ecs
->ptid
);
1862 remove_status
= remove_breakpoints ();
1863 /* Did we fail to remove breakpoints? If so, try
1864 to set the PC past the bp. (There's at least
1865 one situation in which we can fail to remove
1866 the bp's: On HP-UX's that use ttrace, we can't
1867 change the address space of a vforking child
1868 process until the child exits (well, okay, not
1869 then either :-) or execs. */
1870 if (remove_status
!= 0)
1872 /* FIXME! This is obviously non-portable! */
1873 write_pc_pid (stop_pc
- DECR_PC_AFTER_BREAK
+ 4,
1875 /* We need to restart all the threads now,
1876 * unles we're running in scheduler-locked mode.
1877 * Use currently_stepping to determine whether to
1880 /* FIXME MVS: is there any reason not to call resume()? */
1881 if (scheduler_mode
== schedlock_on
)
1882 target_resume (ecs
->ptid
,
1883 currently_stepping (ecs
),
1886 target_resume (RESUME_ALL
,
1887 currently_stepping (ecs
),
1889 prepare_to_wait (ecs
);
1894 breakpoints_inserted
= 0;
1895 if (!ptid_equal (inferior_ptid
, ecs
->ptid
))
1896 context_switch (ecs
);
1897 ecs
->waiton_ptid
= ecs
->ptid
;
1898 ecs
->wp
= &(ecs
->ws
);
1899 ecs
->another_trap
= 1;
1901 ecs
->infwait_state
= infwait_thread_hop_state
;
1903 registers_changed ();
1910 ecs
->random_signal
= 1;
1912 /* See if something interesting happened to the non-current thread. If
1913 so, then switch to that thread, and eventually give control back to
1916 Note that if there's any kind of pending follow (i.e., of a fork,
1917 vfork or exec), we don't want to do this now. Rather, we'll let
1918 the next resume handle it. */
1919 if (! ptid_equal (ecs
->ptid
, inferior_ptid
) &&
1920 (pending_follow
.kind
== TARGET_WAITKIND_SPURIOUS
))
1924 /* If it's a random signal for a non-current thread, notify user
1925 if he's expressed an interest. */
1926 if (ecs
->random_signal
1927 && signal_print
[stop_signal
])
1929 /* ??rehrauer: I don't understand the rationale for this code. If the
1930 inferior will stop as a result of this signal, then the act of handling
1931 the stop ought to print a message that's couches the stoppage in user
1932 terms, e.g., "Stopped for breakpoint/watchpoint". If the inferior
1933 won't stop as a result of the signal -- i.e., if the signal is merely
1934 a side-effect of something GDB's doing "under the covers" for the
1935 user, such as stepping threads over a breakpoint they shouldn't stop
1936 for -- then the message seems to be a serious annoyance at best.
1938 For now, remove the message altogether. */
1941 target_terminal_ours_for_output ();
1942 printf_filtered ("\nProgram received signal %s, %s.\n",
1943 target_signal_to_name (stop_signal
),
1944 target_signal_to_string (stop_signal
));
1945 gdb_flush (gdb_stdout
);
1949 /* If it's not SIGTRAP and not a signal we want to stop for, then
1950 continue the thread. */
1952 if (stop_signal
!= TARGET_SIGNAL_TRAP
1953 && !signal_stop
[stop_signal
])
1956 target_terminal_inferior ();
1958 /* Clear the signal if it should not be passed. */
1959 if (signal_program
[stop_signal
] == 0)
1960 stop_signal
= TARGET_SIGNAL_0
;
1962 target_resume (ecs
->ptid
, 0, stop_signal
);
1963 prepare_to_wait (ecs
);
1967 /* It's a SIGTRAP or a signal we're interested in. Switch threads,
1968 and fall into the rest of wait_for_inferior(). */
1970 context_switch (ecs
);
1973 context_hook (pid_to_thread_id (ecs
->ptid
));
1975 flush_cached_frames ();
1978 if (SOFTWARE_SINGLE_STEP_P () && singlestep_breakpoints_inserted_p
)
1980 /* Pull the single step breakpoints out of the target. */
1981 SOFTWARE_SINGLE_STEP (0, 0);
1982 singlestep_breakpoints_inserted_p
= 0;
1985 /* If PC is pointing at a nullified instruction, then step beyond
1986 it so that the user won't be confused when GDB appears to be ready
1989 /* if (INSTRUCTION_NULLIFIED && currently_stepping (ecs)) */
1990 if (INSTRUCTION_NULLIFIED
)
1992 registers_changed ();
1993 target_resume (ecs
->ptid
, 1, TARGET_SIGNAL_0
);
1995 /* We may have received a signal that we want to pass to
1996 the inferior; therefore, we must not clobber the waitstatus
1999 ecs
->infwait_state
= infwait_nullified_state
;
2000 ecs
->waiton_ptid
= ecs
->ptid
;
2001 ecs
->wp
= &(ecs
->tmpstatus
);
2002 prepare_to_wait (ecs
);
2006 /* It may not be necessary to disable the watchpoint to stop over
2007 it. For example, the PA can (with some kernel cooperation)
2008 single step over a watchpoint without disabling the watchpoint. */
2009 if (HAVE_STEPPABLE_WATCHPOINT
&& STOPPED_BY_WATCHPOINT (ecs
->ws
))
2012 prepare_to_wait (ecs
);
2016 /* It is far more common to need to disable a watchpoint to step
2017 the inferior over it. FIXME. What else might a debug
2018 register or page protection watchpoint scheme need here? */
2019 if (HAVE_NONSTEPPABLE_WATCHPOINT
&& STOPPED_BY_WATCHPOINT (ecs
->ws
))
2021 /* At this point, we are stopped at an instruction which has
2022 attempted to write to a piece of memory under control of
2023 a watchpoint. The instruction hasn't actually executed
2024 yet. If we were to evaluate the watchpoint expression
2025 now, we would get the old value, and therefore no change
2026 would seem to have occurred.
2028 In order to make watchpoints work `right', we really need
2029 to complete the memory write, and then evaluate the
2030 watchpoint expression. The following code does that by
2031 removing the watchpoint (actually, all watchpoints and
2032 breakpoints), single-stepping the target, re-inserting
2033 watchpoints, and then falling through to let normal
2034 single-step processing handle proceed. Since this
2035 includes evaluating watchpoints, things will come to a
2036 stop in the correct manner. */
2038 if (DECR_PC_AFTER_BREAK
)
2039 write_pc (stop_pc
- DECR_PC_AFTER_BREAK
);
2041 remove_breakpoints ();
2042 registers_changed ();
2043 target_resume (ecs
->ptid
, 1, TARGET_SIGNAL_0
); /* Single step */
2045 ecs
->waiton_ptid
= ecs
->ptid
;
2046 ecs
->wp
= &(ecs
->ws
);
2047 ecs
->infwait_state
= infwait_nonstep_watch_state
;
2048 prepare_to_wait (ecs
);
2052 /* It may be possible to simply continue after a watchpoint. */
2053 if (HAVE_CONTINUABLE_WATCHPOINT
)
2054 STOPPED_BY_WATCHPOINT (ecs
->ws
);
2056 ecs
->stop_func_start
= 0;
2057 ecs
->stop_func_end
= 0;
2058 ecs
->stop_func_name
= 0;
2059 /* Don't care about return value; stop_func_start and stop_func_name
2060 will both be 0 if it doesn't work. */
2061 find_pc_partial_function (stop_pc
, &ecs
->stop_func_name
,
2062 &ecs
->stop_func_start
, &ecs
->stop_func_end
);
2063 ecs
->stop_func_start
+= FUNCTION_START_OFFSET
;
2064 ecs
->another_trap
= 0;
2065 bpstat_clear (&stop_bpstat
);
2067 stop_stack_dummy
= 0;
2068 stop_print_frame
= 1;
2069 ecs
->random_signal
= 0;
2070 stopped_by_random_signal
= 0;
2071 breakpoints_failed
= 0;
2073 /* Look at the cause of the stop, and decide what to do.
2074 The alternatives are:
2075 1) break; to really stop and return to the debugger,
2076 2) drop through to start up again
2077 (set ecs->another_trap to 1 to single step once)
2078 3) set ecs->random_signal to 1, and the decision between 1 and 2
2079 will be made according to the signal handling tables. */
2081 /* First, distinguish signals caused by the debugger from signals
2082 that have to do with the program's own actions.
2083 Note that breakpoint insns may cause SIGTRAP or SIGILL
2084 or SIGEMT, depending on the operating system version.
2085 Here we detect when a SIGILL or SIGEMT is really a breakpoint
2086 and change it to SIGTRAP. */
2088 if (stop_signal
== TARGET_SIGNAL_TRAP
2089 || (breakpoints_inserted
&&
2090 (stop_signal
== TARGET_SIGNAL_ILL
2091 || stop_signal
== TARGET_SIGNAL_EMT
2093 || stop_soon_quietly
)
2095 if (stop_signal
== TARGET_SIGNAL_TRAP
&& stop_after_trap
)
2097 stop_print_frame
= 0;
2098 stop_stepping (ecs
);
2101 if (stop_soon_quietly
)
2103 stop_stepping (ecs
);
2107 /* Don't even think about breakpoints
2108 if just proceeded over a breakpoint.
2110 However, if we are trying to proceed over a breakpoint
2111 and end up in sigtramp, then through_sigtramp_breakpoint
2112 will be set and we should check whether we've hit the
2114 if (stop_signal
== TARGET_SIGNAL_TRAP
&& trap_expected
2115 && through_sigtramp_breakpoint
== NULL
)
2116 bpstat_clear (&stop_bpstat
);
2119 /* See if there is a breakpoint at the current PC. */
2121 /* The second argument of bpstat_stop_status is meant to help
2122 distinguish between a breakpoint trap and a singlestep trap.
2123 This is only important on targets where DECR_PC_AFTER_BREAK
2124 is non-zero. The prev_pc test is meant to distinguish between
2125 singlestepping a trap instruction, and singlestepping thru a
2126 jump to the instruction following a trap instruction. */
2128 stop_bpstat
= bpstat_stop_status
2130 /* Pass TRUE if our reason for stopping is something other
2131 than hitting a breakpoint. We do this by checking that
2132 1) stepping is going on and 2) we didn't hit a breakpoint
2133 in a signal handler without an intervening stop in
2134 sigtramp, which is detected by a new stack pointer value
2135 below any usual function calling stack adjustments. */
2136 (currently_stepping (ecs
)
2137 && prev_pc
!= stop_pc
- DECR_PC_AFTER_BREAK
2139 && INNER_THAN (read_sp (), (step_sp
- 16))))
2141 /* Following in case break condition called a
2143 stop_print_frame
= 1;
2146 if (stop_signal
== TARGET_SIGNAL_TRAP
)
2148 = !(bpstat_explains_signal (stop_bpstat
)
2150 || (!CALL_DUMMY_BREAKPOINT_OFFSET_P
2151 && PC_IN_CALL_DUMMY (stop_pc
, read_sp (),
2152 FRAME_FP (get_current_frame ())))
2153 || (step_range_end
&& step_resume_breakpoint
== NULL
));
2158 = !(bpstat_explains_signal (stop_bpstat
)
2159 /* End of a stack dummy. Some systems (e.g. Sony
2160 news) give another signal besides SIGTRAP, so
2161 check here as well as above. */
2162 || (!CALL_DUMMY_BREAKPOINT_OFFSET_P
2163 && PC_IN_CALL_DUMMY (stop_pc
, read_sp (),
2164 FRAME_FP (get_current_frame ())))
2166 if (!ecs
->random_signal
)
2167 stop_signal
= TARGET_SIGNAL_TRAP
;
2171 /* When we reach this point, we've pretty much decided
2172 that the reason for stopping must've been a random
2173 (unexpected) signal. */
2176 ecs
->random_signal
= 1;
2177 /* If a fork, vfork or exec event was seen, then there are two
2178 possible responses we can make:
2180 1. If a catchpoint triggers for the event (ecs->random_signal == 0),
2181 then we must stop now and issue a prompt. We will resume
2182 the inferior when the user tells us to.
2183 2. If no catchpoint triggers for the event (ecs->random_signal == 1),
2184 then we must resume the inferior now and keep checking.
2186 In either case, we must take appropriate steps to "follow" the
2187 the fork/vfork/exec when the inferior is resumed. For example,
2188 if follow-fork-mode is "child", then we must detach from the
2189 parent inferior and follow the new child inferior.
2191 In either case, setting pending_follow causes the next resume()
2192 to take the appropriate following action. */
2193 process_event_stop_test
:
2194 if (ecs
->ws
.kind
== TARGET_WAITKIND_FORKED
)
2196 if (ecs
->random_signal
) /* I.e., no catchpoint triggered for this. */
2199 stop_signal
= TARGET_SIGNAL_0
;
2204 else if (ecs
->ws
.kind
== TARGET_WAITKIND_VFORKED
)
2206 if (ecs
->random_signal
) /* I.e., no catchpoint triggered for this. */
2208 stop_signal
= TARGET_SIGNAL_0
;
2213 else if (ecs
->ws
.kind
== TARGET_WAITKIND_EXECD
)
2215 pending_follow
.kind
= ecs
->ws
.kind
;
2216 if (ecs
->random_signal
) /* I.e., no catchpoint triggered for this. */
2219 stop_signal
= TARGET_SIGNAL_0
;
2225 /* For the program's own signals, act according to
2226 the signal handling tables. */
2228 if (ecs
->random_signal
)
2230 /* Signal not for debugging purposes. */
2233 stopped_by_random_signal
= 1;
2235 if (signal_print
[stop_signal
])
2238 target_terminal_ours_for_output ();
2239 print_stop_reason (SIGNAL_RECEIVED
, stop_signal
);
2241 if (signal_stop
[stop_signal
])
2243 stop_stepping (ecs
);
2246 /* If not going to stop, give terminal back
2247 if we took it away. */
2249 target_terminal_inferior ();
2251 /* Clear the signal if it should not be passed. */
2252 if (signal_program
[stop_signal
] == 0)
2253 stop_signal
= TARGET_SIGNAL_0
;
2255 /* I'm not sure whether this needs to be check_sigtramp2 or
2256 whether it could/should be keep_going.
2258 This used to jump to step_over_function if we are stepping,
2261 Suppose the user does a `next' over a function call, and while
2262 that call is in progress, the inferior receives a signal for
2263 which GDB does not stop (i.e., signal_stop[SIG] is false). In
2264 that case, when we reach this point, there is already a
2265 step-resume breakpoint established, right where it should be:
2266 immediately after the function call the user is "next"-ing
2267 over. If we call step_over_function now, two bad things
2270 - we'll create a new breakpoint, at wherever the current
2271 frame's return address happens to be. That could be
2272 anywhere, depending on what function call happens to be on
2273 the top of the stack at that point. Point is, it's probably
2274 not where we need it.
2276 - the existing step-resume breakpoint (which is at the correct
2277 address) will get orphaned: step_resume_breakpoint will point
2278 to the new breakpoint, and the old step-resume breakpoint
2279 will never be cleaned up.
2281 The old behavior was meant to help HP-UX single-step out of
2282 sigtramps. It would place the new breakpoint at prev_pc, which
2283 was certainly wrong. I don't know the details there, so fixing
2284 this probably breaks that. As with anything else, it's up to
2285 the HP-UX maintainer to furnish a fix that doesn't break other
2286 platforms. --JimB, 20 May 1999 */
2287 check_sigtramp2 (ecs
);
2292 /* Handle cases caused by hitting a breakpoint. */
2294 CORE_ADDR jmp_buf_pc
;
2295 struct bpstat_what what
;
2297 what
= bpstat_what (stop_bpstat
);
2299 if (what
.call_dummy
)
2301 stop_stack_dummy
= 1;
2303 trap_expected_after_continue
= 1;
2307 switch (what
.main_action
)
2309 case BPSTAT_WHAT_SET_LONGJMP_RESUME
:
2310 /* If we hit the breakpoint at longjmp, disable it for the
2311 duration of this command. Then, install a temporary
2312 breakpoint at the target of the jmp_buf. */
2313 disable_longjmp_breakpoint ();
2314 remove_breakpoints ();
2315 breakpoints_inserted
= 0;
2316 if (!GET_LONGJMP_TARGET (&jmp_buf_pc
))
2322 /* Need to blow away step-resume breakpoint, as it
2323 interferes with us */
2324 if (step_resume_breakpoint
!= NULL
)
2326 delete_step_resume_breakpoint (&step_resume_breakpoint
);
2328 /* Not sure whether we need to blow this away too, but probably
2329 it is like the step-resume breakpoint. */
2330 if (through_sigtramp_breakpoint
!= NULL
)
2332 delete_breakpoint (through_sigtramp_breakpoint
);
2333 through_sigtramp_breakpoint
= NULL
;
2337 /* FIXME - Need to implement nested temporary breakpoints */
2338 if (step_over_calls
> 0)
2339 set_longjmp_resume_breakpoint (jmp_buf_pc
,
2340 get_current_frame ());
2343 set_longjmp_resume_breakpoint (jmp_buf_pc
, NULL
);
2344 ecs
->handling_longjmp
= 1; /* FIXME */
2348 case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME
:
2349 case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME_SINGLE
:
2350 remove_breakpoints ();
2351 breakpoints_inserted
= 0;
2353 /* FIXME - Need to implement nested temporary breakpoints */
2355 && (INNER_THAN (FRAME_FP (get_current_frame ()),
2356 step_frame_address
)))
2358 ecs
->another_trap
= 1;
2363 disable_longjmp_breakpoint ();
2364 ecs
->handling_longjmp
= 0; /* FIXME */
2365 if (what
.main_action
== BPSTAT_WHAT_CLEAR_LONGJMP_RESUME
)
2367 /* else fallthrough */
2369 case BPSTAT_WHAT_SINGLE
:
2370 if (breakpoints_inserted
)
2372 remove_breakpoints ();
2374 breakpoints_inserted
= 0;
2375 ecs
->another_trap
= 1;
2376 /* Still need to check other stuff, at least the case
2377 where we are stepping and step out of the right range. */
2380 case BPSTAT_WHAT_STOP_NOISY
:
2381 stop_print_frame
= 1;
2383 /* We are about to nuke the step_resume_breakpoint and
2384 through_sigtramp_breakpoint via the cleanup chain, so
2385 no need to worry about it here. */
2387 stop_stepping (ecs
);
2390 case BPSTAT_WHAT_STOP_SILENT
:
2391 stop_print_frame
= 0;
2393 /* We are about to nuke the step_resume_breakpoint and
2394 through_sigtramp_breakpoint via the cleanup chain, so
2395 no need to worry about it here. */
2397 stop_stepping (ecs
);
2400 case BPSTAT_WHAT_STEP_RESUME
:
2401 /* This proably demands a more elegant solution, but, yeah
2404 This function's use of the simple variable
2405 step_resume_breakpoint doesn't seem to accomodate
2406 simultaneously active step-resume bp's, although the
2407 breakpoint list certainly can.
2409 If we reach here and step_resume_breakpoint is already
2410 NULL, then apparently we have multiple active
2411 step-resume bp's. We'll just delete the breakpoint we
2412 stopped at, and carry on.
2414 Correction: what the code currently does is delete a
2415 step-resume bp, but it makes no effort to ensure that
2416 the one deleted is the one currently stopped at. MVS */
2418 if (step_resume_breakpoint
== NULL
)
2420 step_resume_breakpoint
=
2421 bpstat_find_step_resume_breakpoint (stop_bpstat
);
2423 delete_step_resume_breakpoint (&step_resume_breakpoint
);
2426 case BPSTAT_WHAT_THROUGH_SIGTRAMP
:
2427 if (through_sigtramp_breakpoint
)
2428 delete_breakpoint (through_sigtramp_breakpoint
);
2429 through_sigtramp_breakpoint
= NULL
;
2431 /* If were waiting for a trap, hitting the step_resume_break
2432 doesn't count as getting it. */
2434 ecs
->another_trap
= 1;
2437 case BPSTAT_WHAT_CHECK_SHLIBS
:
2438 case BPSTAT_WHAT_CHECK_SHLIBS_RESUME_FROM_HOOK
:
2441 /* Remove breakpoints, we eventually want to step over the
2442 shlib event breakpoint, and SOLIB_ADD might adjust
2443 breakpoint addresses via breakpoint_re_set. */
2444 if (breakpoints_inserted
)
2445 remove_breakpoints ();
2446 breakpoints_inserted
= 0;
2448 /* Check for any newly added shared libraries if we're
2449 supposed to be adding them automatically. */
2452 /* Switch terminal for any messages produced by
2453 breakpoint_re_set. */
2454 target_terminal_ours_for_output ();
2455 SOLIB_ADD (NULL
, 0, NULL
);
2456 target_terminal_inferior ();
2459 /* Try to reenable shared library breakpoints, additional
2460 code segments in shared libraries might be mapped in now. */
2461 re_enable_breakpoints_in_shlibs ();
2463 /* If requested, stop when the dynamic linker notifies
2464 gdb of events. This allows the user to get control
2465 and place breakpoints in initializer routines for
2466 dynamically loaded objects (among other things). */
2467 if (stop_on_solib_events
)
2469 stop_stepping (ecs
);
2473 /* If we stopped due to an explicit catchpoint, then the
2474 (see above) call to SOLIB_ADD pulled in any symbols
2475 from a newly-loaded library, if appropriate.
2477 We do want the inferior to stop, but not where it is
2478 now, which is in the dynamic linker callback. Rather,
2479 we would like it stop in the user's program, just after
2480 the call that caused this catchpoint to trigger. That
2481 gives the user a more useful vantage from which to
2482 examine their program's state. */
2483 else if (what
.main_action
== BPSTAT_WHAT_CHECK_SHLIBS_RESUME_FROM_HOOK
)
2485 /* ??rehrauer: If I could figure out how to get the
2486 right return PC from here, we could just set a temp
2487 breakpoint and resume. I'm not sure we can without
2488 cracking open the dld's shared libraries and sniffing
2489 their unwind tables and text/data ranges, and that's
2490 not a terribly portable notion.
2492 Until that time, we must step the inferior out of the
2493 dld callback, and also out of the dld itself (and any
2494 code or stubs in libdld.sl, such as "shl_load" and
2495 friends) until we reach non-dld code. At that point,
2496 we can stop stepping. */
2497 bpstat_get_triggered_catchpoints (stop_bpstat
,
2498 &ecs
->stepping_through_solib_catchpoints
);
2499 ecs
->stepping_through_solib_after_catch
= 1;
2501 /* Be sure to lift all breakpoints, so the inferior does
2502 actually step past this point... */
2503 ecs
->another_trap
= 1;
2508 /* We want to step over this breakpoint, then keep going. */
2509 ecs
->another_trap
= 1;
2516 case BPSTAT_WHAT_LAST
:
2517 /* Not a real code, but listed here to shut up gcc -Wall. */
2519 case BPSTAT_WHAT_KEEP_CHECKING
:
2524 /* We come here if we hit a breakpoint but should not
2525 stop for it. Possibly we also were stepping
2526 and should stop for that. So fall through and
2527 test for stepping. But, if not stepping,
2530 /* Are we stepping to get the inferior out of the dynamic
2531 linker's hook (and possibly the dld itself) after catching
2533 if (ecs
->stepping_through_solib_after_catch
)
2535 #if defined(SOLIB_ADD)
2536 /* Have we reached our destination? If not, keep going. */
2537 if (SOLIB_IN_DYNAMIC_LINKER (PIDGET (ecs
->ptid
), stop_pc
))
2539 ecs
->another_trap
= 1;
2544 /* Else, stop and report the catchpoint(s) whose triggering
2545 caused us to begin stepping. */
2546 ecs
->stepping_through_solib_after_catch
= 0;
2547 bpstat_clear (&stop_bpstat
);
2548 stop_bpstat
= bpstat_copy (ecs
->stepping_through_solib_catchpoints
);
2549 bpstat_clear (&ecs
->stepping_through_solib_catchpoints
);
2550 stop_print_frame
= 1;
2551 stop_stepping (ecs
);
2555 if (!CALL_DUMMY_BREAKPOINT_OFFSET_P
)
2557 /* This is the old way of detecting the end of the stack dummy.
2558 An architecture which defines CALL_DUMMY_BREAKPOINT_OFFSET gets
2559 handled above. As soon as we can test it on all of them, all
2560 architectures should define it. */
2562 /* If this is the breakpoint at the end of a stack dummy,
2563 just stop silently, unless the user was doing an si/ni, in which
2564 case she'd better know what she's doing. */
2566 if (CALL_DUMMY_HAS_COMPLETED (stop_pc
, read_sp (),
2567 FRAME_FP (get_current_frame ()))
2570 stop_print_frame
= 0;
2571 stop_stack_dummy
= 1;
2573 trap_expected_after_continue
= 1;
2575 stop_stepping (ecs
);
2580 if (step_resume_breakpoint
)
2582 /* Having a step-resume breakpoint overrides anything
2583 else having to do with stepping commands until
2584 that breakpoint is reached. */
2585 /* I'm not sure whether this needs to be check_sigtramp2 or
2586 whether it could/should be keep_going. */
2587 check_sigtramp2 (ecs
);
2592 if (step_range_end
== 0)
2594 /* Likewise if we aren't even stepping. */
2595 /* I'm not sure whether this needs to be check_sigtramp2 or
2596 whether it could/should be keep_going. */
2597 check_sigtramp2 (ecs
);
2602 /* If stepping through a line, keep going if still within it.
2604 Note that step_range_end is the address of the first instruction
2605 beyond the step range, and NOT the address of the last instruction
2607 if (stop_pc
>= step_range_start
2608 && stop_pc
< step_range_end
)
2610 /* We might be doing a BPSTAT_WHAT_SINGLE and getting a signal.
2611 So definately need to check for sigtramp here. */
2612 check_sigtramp2 (ecs
);
2617 /* We stepped out of the stepping range. */
2619 /* If we are stepping at the source level and entered the runtime
2620 loader dynamic symbol resolution code, we keep on single stepping
2621 until we exit the run time loader code and reach the callee's
2623 if (step_over_calls
== STEP_OVER_UNDEBUGGABLE
&& IN_SOLIB_DYNSYM_RESOLVE_CODE (stop_pc
))
2625 CORE_ADDR pc_after_resolver
= SKIP_SOLIB_RESOLVER (stop_pc
);
2627 if (pc_after_resolver
)
2629 /* Set up a step-resume breakpoint at the address
2630 indicated by SKIP_SOLIB_RESOLVER. */
2631 struct symtab_and_line sr_sal
;
2633 sr_sal
.pc
= pc_after_resolver
;
2635 check_for_old_step_resume_breakpoint ();
2636 step_resume_breakpoint
=
2637 set_momentary_breakpoint (sr_sal
, NULL
, bp_step_resume
);
2638 if (breakpoints_inserted
)
2639 insert_breakpoints ();
2646 /* We can't update step_sp every time through the loop, because
2647 reading the stack pointer would slow down stepping too much.
2648 But we can update it every time we leave the step range. */
2649 ecs
->update_step_sp
= 1;
2651 /* Did we just take a signal? */
2652 if (IN_SIGTRAMP (stop_pc
, ecs
->stop_func_name
)
2653 && !IN_SIGTRAMP (prev_pc
, prev_func_name
)
2654 && INNER_THAN (read_sp (), step_sp
))
2656 /* We've just taken a signal; go until we are back to
2657 the point where we took it and one more. */
2659 /* Note: The test above succeeds not only when we stepped
2660 into a signal handler, but also when we step past the last
2661 statement of a signal handler and end up in the return stub
2662 of the signal handler trampoline. To distinguish between
2663 these two cases, check that the frame is INNER_THAN the
2664 previous one below. pai/1997-09-11 */
2668 CORE_ADDR current_frame
= FRAME_FP (get_current_frame ());
2670 if (INNER_THAN (current_frame
, step_frame_address
))
2672 /* We have just taken a signal; go until we are back to
2673 the point where we took it and one more. */
2675 /* This code is needed at least in the following case:
2676 The user types "next" and then a signal arrives (before
2677 the "next" is done). */
2679 /* Note that if we are stopped at a breakpoint, then we need
2680 the step_resume breakpoint to override any breakpoints at
2681 the same location, so that we will still step over the
2682 breakpoint even though the signal happened. */
2683 struct symtab_and_line sr_sal
;
2686 sr_sal
.symtab
= NULL
;
2688 sr_sal
.pc
= prev_pc
;
2689 /* We could probably be setting the frame to
2690 step_frame_address; I don't think anyone thought to
2692 check_for_old_step_resume_breakpoint ();
2693 step_resume_breakpoint
=
2694 set_momentary_breakpoint (sr_sal
, NULL
, bp_step_resume
);
2695 if (breakpoints_inserted
)
2696 insert_breakpoints ();
2700 /* We just stepped out of a signal handler and into
2701 its calling trampoline.
2703 Normally, we'd call step_over_function from
2704 here, but for some reason GDB can't unwind the
2705 stack correctly to find the real PC for the point
2706 user code where the signal trampoline will return
2707 -- FRAME_SAVED_PC fails, at least on HP-UX 10.20.
2708 But signal trampolines are pretty small stubs of
2709 code, anyway, so it's OK instead to just
2710 single-step out. Note: assuming such trampolines
2711 don't exhibit recursion on any platform... */
2712 find_pc_partial_function (stop_pc
, &ecs
->stop_func_name
,
2713 &ecs
->stop_func_start
,
2714 &ecs
->stop_func_end
);
2715 /* Readjust stepping range */
2716 step_range_start
= ecs
->stop_func_start
;
2717 step_range_end
= ecs
->stop_func_end
;
2718 ecs
->stepping_through_sigtramp
= 1;
2723 /* If this is stepi or nexti, make sure that the stepping range
2724 gets us past that instruction. */
2725 if (step_range_end
== 1)
2726 /* FIXME: Does this run afoul of the code below which, if
2727 we step into the middle of a line, resets the stepping
2729 step_range_end
= (step_range_start
= prev_pc
) + 1;
2731 ecs
->remove_breakpoints_on_following_step
= 1;
2736 if (stop_pc
== ecs
->stop_func_start
/* Quick test */
2737 || (in_prologue (stop_pc
, ecs
->stop_func_start
) &&
2738 !IN_SOLIB_RETURN_TRAMPOLINE (stop_pc
, ecs
->stop_func_name
))
2739 || IN_SOLIB_CALL_TRAMPOLINE (stop_pc
, ecs
->stop_func_name
)
2740 || ecs
->stop_func_name
== 0)
2742 /* It's a subroutine call. */
2744 if ((step_over_calls
== STEP_OVER_NONE
)
2745 || ((step_range_end
== 1)
2746 && in_prologue (prev_pc
, ecs
->stop_func_start
)))
2748 /* I presume that step_over_calls is only 0 when we're
2749 supposed to be stepping at the assembly language level
2750 ("stepi"). Just stop. */
2751 /* Also, maybe we just did a "nexti" inside a prolog,
2752 so we thought it was a subroutine call but it was not.
2753 Stop as well. FENN */
2755 print_stop_reason (END_STEPPING_RANGE
, 0);
2756 stop_stepping (ecs
);
2760 if (step_over_calls
== STEP_OVER_ALL
|| IGNORE_HELPER_CALL (stop_pc
))
2762 /* We're doing a "next". */
2764 if (IN_SIGTRAMP (stop_pc
, ecs
->stop_func_name
)
2765 && INNER_THAN (step_frame_address
, read_sp()))
2766 /* We stepped out of a signal handler, and into its
2767 calling trampoline. This is misdetected as a
2768 subroutine call, but stepping over the signal
2769 trampoline isn't such a bad idea. In order to do
2770 that, we have to ignore the value in
2771 step_frame_address, since that doesn't represent the
2772 frame that'll reach when we return from the signal
2773 trampoline. Otherwise we'll probably continue to the
2774 end of the program. */
2775 step_frame_address
= 0;
2777 step_over_function (ecs
);
2782 /* If we are in a function call trampoline (a stub between
2783 the calling routine and the real function), locate the real
2784 function. That's what tells us (a) whether we want to step
2785 into it at all, and (b) what prologue we want to run to
2786 the end of, if we do step into it. */
2787 tmp
= SKIP_TRAMPOLINE_CODE (stop_pc
);
2789 ecs
->stop_func_start
= tmp
;
2792 tmp
= DYNAMIC_TRAMPOLINE_NEXTPC (stop_pc
);
2795 struct symtab_and_line xxx
;
2796 /* Why isn't this s_a_l called "sr_sal", like all of the
2797 other s_a_l's where this code is duplicated? */
2798 INIT_SAL (&xxx
); /* initialize to zeroes */
2800 xxx
.section
= find_pc_overlay (xxx
.pc
);
2801 check_for_old_step_resume_breakpoint ();
2802 step_resume_breakpoint
=
2803 set_momentary_breakpoint (xxx
, NULL
, bp_step_resume
);
2804 insert_breakpoints ();
2810 /* If we have line number information for the function we
2811 are thinking of stepping into, step into it.
2813 If there are several symtabs at that PC (e.g. with include
2814 files), just want to know whether *any* of them have line
2815 numbers. find_pc_line handles this. */
2817 struct symtab_and_line tmp_sal
;
2819 tmp_sal
= find_pc_line (ecs
->stop_func_start
, 0);
2820 if (tmp_sal
.line
!= 0)
2822 step_into_function (ecs
);
2827 /* If we have no line number and the step-stop-if-no-debug
2828 is set, we stop the step so that the user has a chance to
2829 switch in assembly mode. */
2830 if (step_over_calls
== STEP_OVER_UNDEBUGGABLE
&& step_stop_if_no_debug
)
2833 print_stop_reason (END_STEPPING_RANGE
, 0);
2834 stop_stepping (ecs
);
2838 step_over_function (ecs
);
2844 /* We've wandered out of the step range. */
2846 ecs
->sal
= find_pc_line (stop_pc
, 0);
2848 if (step_range_end
== 1)
2850 /* It is stepi or nexti. We always want to stop stepping after
2853 print_stop_reason (END_STEPPING_RANGE
, 0);
2854 stop_stepping (ecs
);
2858 /* If we're in the return path from a shared library trampoline,
2859 we want to proceed through the trampoline when stepping. */
2860 if (IN_SOLIB_RETURN_TRAMPOLINE (stop_pc
, ecs
->stop_func_name
))
2864 /* Determine where this trampoline returns. */
2865 tmp
= SKIP_TRAMPOLINE_CODE (stop_pc
);
2867 /* Only proceed through if we know where it's going. */
2870 /* And put the step-breakpoint there and go until there. */
2871 struct symtab_and_line sr_sal
;
2873 INIT_SAL (&sr_sal
); /* initialize to zeroes */
2875 sr_sal
.section
= find_pc_overlay (sr_sal
.pc
);
2876 /* Do not specify what the fp should be when we stop
2877 since on some machines the prologue
2878 is where the new fp value is established. */
2879 check_for_old_step_resume_breakpoint ();
2880 step_resume_breakpoint
=
2881 set_momentary_breakpoint (sr_sal
, NULL
, bp_step_resume
);
2882 if (breakpoints_inserted
)
2883 insert_breakpoints ();
2885 /* Restart without fiddling with the step ranges or
2892 if (ecs
->sal
.line
== 0)
2894 /* We have no line number information. That means to stop
2895 stepping (does this always happen right after one instruction,
2896 when we do "s" in a function with no line numbers,
2897 or can this happen as a result of a return or longjmp?). */
2899 print_stop_reason (END_STEPPING_RANGE
, 0);
2900 stop_stepping (ecs
);
2904 if ((stop_pc
== ecs
->sal
.pc
)
2905 && (ecs
->current_line
!= ecs
->sal
.line
|| ecs
->current_symtab
!= ecs
->sal
.symtab
))
2907 /* We are at the start of a different line. So stop. Note that
2908 we don't stop if we step into the middle of a different line.
2909 That is said to make things like for (;;) statements work
2912 print_stop_reason (END_STEPPING_RANGE
, 0);
2913 stop_stepping (ecs
);
2917 /* We aren't done stepping.
2919 Optimize by setting the stepping range to the line.
2920 (We might not be in the original line, but if we entered a
2921 new line in mid-statement, we continue stepping. This makes
2922 things like for(;;) statements work better.) */
2924 if (ecs
->stop_func_end
&& ecs
->sal
.end
>= ecs
->stop_func_end
)
2926 /* If this is the last line of the function, don't keep stepping
2927 (it would probably step us out of the function).
2928 This is particularly necessary for a one-line function,
2929 in which after skipping the prologue we better stop even though
2930 we will be in mid-line. */
2932 print_stop_reason (END_STEPPING_RANGE
, 0);
2933 stop_stepping (ecs
);
2936 step_range_start
= ecs
->sal
.pc
;
2937 step_range_end
= ecs
->sal
.end
;
2938 step_frame_address
= FRAME_FP (get_current_frame ());
2939 ecs
->current_line
= ecs
->sal
.line
;
2940 ecs
->current_symtab
= ecs
->sal
.symtab
;
2942 /* In the case where we just stepped out of a function into the middle
2943 of a line of the caller, continue stepping, but step_frame_address
2944 must be modified to current frame */
2946 CORE_ADDR current_frame
= FRAME_FP (get_current_frame ());
2947 if (!(INNER_THAN (current_frame
, step_frame_address
)))
2948 step_frame_address
= current_frame
;
2953 } /* extra brace, to preserve old indentation */
2956 /* Are we in the middle of stepping? */
2959 currently_stepping (struct execution_control_state
*ecs
)
2961 return ((through_sigtramp_breakpoint
== NULL
2962 && !ecs
->handling_longjmp
2963 && ((step_range_end
&& step_resume_breakpoint
== NULL
)
2965 || ecs
->stepping_through_solib_after_catch
2966 || bpstat_should_step ());
2970 check_sigtramp2 (struct execution_control_state
*ecs
)
2973 && IN_SIGTRAMP (stop_pc
, ecs
->stop_func_name
)
2974 && !IN_SIGTRAMP (prev_pc
, prev_func_name
)
2975 && INNER_THAN (read_sp (), step_sp
))
2977 /* What has happened here is that we have just stepped the
2978 inferior with a signal (because it is a signal which
2979 shouldn't make us stop), thus stepping into sigtramp.
2981 So we need to set a step_resume_break_address breakpoint and
2982 continue until we hit it, and then step. FIXME: This should
2983 be more enduring than a step_resume breakpoint; we should
2984 know that we will later need to keep going rather than
2985 re-hitting the breakpoint here (see the testsuite,
2986 gdb.base/signals.exp where it says "exceedingly difficult"). */
2988 struct symtab_and_line sr_sal
;
2990 INIT_SAL (&sr_sal
); /* initialize to zeroes */
2991 sr_sal
.pc
= prev_pc
;
2992 sr_sal
.section
= find_pc_overlay (sr_sal
.pc
);
2993 /* We perhaps could set the frame if we kept track of what the
2994 frame corresponding to prev_pc was. But we don't, so don't. */
2995 through_sigtramp_breakpoint
=
2996 set_momentary_breakpoint (sr_sal
, NULL
, bp_through_sigtramp
);
2997 if (breakpoints_inserted
)
2998 insert_breakpoints ();
3000 ecs
->remove_breakpoints_on_following_step
= 1;
3001 ecs
->another_trap
= 1;
3005 /* Subroutine call with source code we should not step over. Do step
3006 to the first line of code in it. */
3009 step_into_function (struct execution_control_state
*ecs
)
3012 struct symtab_and_line sr_sal
;
3014 s
= find_pc_symtab (stop_pc
);
3015 if (s
&& s
->language
!= language_asm
)
3016 ecs
->stop_func_start
= SKIP_PROLOGUE (ecs
->stop_func_start
);
3018 ecs
->sal
= find_pc_line (ecs
->stop_func_start
, 0);
3019 /* Use the step_resume_break to step until the end of the prologue,
3020 even if that involves jumps (as it seems to on the vax under
3022 /* If the prologue ends in the middle of a source line, continue to
3023 the end of that source line (if it is still within the function).
3024 Otherwise, just go to end of prologue. */
3025 #ifdef PROLOGUE_FIRSTLINE_OVERLAP
3026 /* no, don't either. It skips any code that's legitimately on the
3030 && ecs
->sal
.pc
!= ecs
->stop_func_start
3031 && ecs
->sal
.end
< ecs
->stop_func_end
)
3032 ecs
->stop_func_start
= ecs
->sal
.end
;
3035 if (ecs
->stop_func_start
== stop_pc
)
3037 /* We are already there: stop now. */
3039 print_stop_reason (END_STEPPING_RANGE
, 0);
3040 stop_stepping (ecs
);
3045 /* Put the step-breakpoint there and go until there. */
3046 INIT_SAL (&sr_sal
); /* initialize to zeroes */
3047 sr_sal
.pc
= ecs
->stop_func_start
;
3048 sr_sal
.section
= find_pc_overlay (ecs
->stop_func_start
);
3049 /* Do not specify what the fp should be when we stop since on
3050 some machines the prologue is where the new fp value is
3052 check_for_old_step_resume_breakpoint ();
3053 step_resume_breakpoint
=
3054 set_momentary_breakpoint (sr_sal
, NULL
, bp_step_resume
);
3055 if (breakpoints_inserted
)
3056 insert_breakpoints ();
3058 /* And make sure stepping stops right away then. */
3059 step_range_end
= step_range_start
;
3064 /* We've just entered a callee, and we wish to resume until it returns
3065 to the caller. Setting a step_resume breakpoint on the return
3066 address will catch a return from the callee.
3068 However, if the callee is recursing, we want to be careful not to
3069 catch returns of those recursive calls, but only of THIS instance
3072 To do this, we set the step_resume bp's frame to our current
3073 caller's frame (step_frame_address, which is set by the "next" or
3074 "until" command, before execution begins). */
3077 step_over_function (struct execution_control_state
*ecs
)
3079 struct symtab_and_line sr_sal
;
3081 INIT_SAL (&sr_sal
); /* initialize to zeros */
3082 sr_sal
.pc
= ADDR_BITS_REMOVE (SAVED_PC_AFTER_CALL (get_current_frame ()));
3083 sr_sal
.section
= find_pc_overlay (sr_sal
.pc
);
3085 check_for_old_step_resume_breakpoint ();
3086 step_resume_breakpoint
=
3087 set_momentary_breakpoint (sr_sal
, get_current_frame (), bp_step_resume
);
3089 if (step_frame_address
&& !IN_SOLIB_DYNSYM_RESOLVE_CODE (sr_sal
.pc
))
3090 step_resume_breakpoint
->frame
= step_frame_address
;
3092 if (breakpoints_inserted
)
3093 insert_breakpoints ();
3097 stop_stepping (struct execution_control_state
*ecs
)
3099 if (target_has_execution
)
3101 /* Are we stopping for a vfork event? We only stop when we see
3102 the child's event. However, we may not yet have seen the
3103 parent's event. And, inferior_ptid is still set to the
3104 parent's pid, until we resume again and follow either the
3107 To ensure that we can really touch inferior_ptid (aka, the
3108 parent process) -- which calls to functions like read_pc
3109 implicitly do -- wait on the parent if necessary. */
3110 if ((pending_follow
.kind
== TARGET_WAITKIND_VFORKED
)
3111 && !pending_follow
.fork_event
.saw_parent_fork
)
3117 if (target_wait_hook
)
3118 parent_ptid
= target_wait_hook (pid_to_ptid (-1), &(ecs
->ws
));
3120 parent_ptid
= target_wait (pid_to_ptid (-1), &(ecs
->ws
));
3122 while (! ptid_equal (parent_ptid
, inferior_ptid
));
3125 /* Assuming the inferior still exists, set these up for next
3126 time, just like we did above if we didn't break out of the
3128 prev_pc
= read_pc ();
3129 prev_func_start
= ecs
->stop_func_start
;
3130 prev_func_name
= ecs
->stop_func_name
;
3133 /* Let callers know we don't want to wait for the inferior anymore. */
3134 ecs
->wait_some_more
= 0;
3137 /* This function handles various cases where we need to continue
3138 waiting for the inferior. */
3139 /* (Used to be the keep_going: label in the old wait_for_inferior) */
3142 keep_going (struct execution_control_state
*ecs
)
3144 /* ??rehrauer: ttrace on HP-UX theoretically allows one to debug a
3145 vforked child between its creation and subsequent exit or call to
3146 exec(). However, I had big problems in this rather creaky exec
3147 engine, getting that to work. The fundamental problem is that
3148 I'm trying to debug two processes via an engine that only
3149 understands a single process with possibly multiple threads.
3151 Hence, this spot is known to have problems when
3152 target_can_follow_vfork_prior_to_exec returns 1. */
3154 /* Save the pc before execution, to compare with pc after stop. */
3155 prev_pc
= read_pc (); /* Might have been DECR_AFTER_BREAK */
3156 prev_func_start
= ecs
->stop_func_start
; /* Ok, since if DECR_PC_AFTER
3157 BREAK is defined, the
3158 original pc would not have
3159 been at the start of a
3161 prev_func_name
= ecs
->stop_func_name
;
3163 if (ecs
->update_step_sp
)
3164 step_sp
= read_sp ();
3165 ecs
->update_step_sp
= 0;
3167 /* If we did not do break;, it means we should keep running the
3168 inferior and not return to debugger. */
3170 if (trap_expected
&& stop_signal
!= TARGET_SIGNAL_TRAP
)
3172 /* We took a signal (which we are supposed to pass through to
3173 the inferior, else we'd have done a break above) and we
3174 haven't yet gotten our trap. Simply continue. */
3175 resume (currently_stepping (ecs
), stop_signal
);
3179 /* Either the trap was not expected, but we are continuing
3180 anyway (the user asked that this signal be passed to the
3183 The signal was SIGTRAP, e.g. it was our signal, but we
3184 decided we should resume from it.
3186 We're going to run this baby now!
3188 Insert breakpoints now, unless we are trying to one-proceed
3189 past a breakpoint. */
3190 /* If we've just finished a special step resume and we don't
3191 want to hit a breakpoint, pull em out. */
3192 if (step_resume_breakpoint
== NULL
3193 && through_sigtramp_breakpoint
== NULL
3194 && ecs
->remove_breakpoints_on_following_step
)
3196 ecs
->remove_breakpoints_on_following_step
= 0;
3197 remove_breakpoints ();
3198 breakpoints_inserted
= 0;
3200 else if (!breakpoints_inserted
&&
3201 (through_sigtramp_breakpoint
!= NULL
|| !ecs
->another_trap
))
3203 breakpoints_failed
= insert_breakpoints ();
3204 if (breakpoints_failed
)
3206 stop_stepping (ecs
);
3209 breakpoints_inserted
= 1;
3212 trap_expected
= ecs
->another_trap
;
3214 /* Do not deliver SIGNAL_TRAP (except when the user explicitly
3215 specifies that such a signal should be delivered to the
3218 Typically, this would occure when a user is debugging a
3219 target monitor on a simulator: the target monitor sets a
3220 breakpoint; the simulator encounters this break-point and
3221 halts the simulation handing control to GDB; GDB, noteing
3222 that the break-point isn't valid, returns control back to the
3223 simulator; the simulator then delivers the hardware
3224 equivalent of a SIGNAL_TRAP to the program being debugged. */
3226 if (stop_signal
== TARGET_SIGNAL_TRAP
3227 && !signal_program
[stop_signal
])
3228 stop_signal
= TARGET_SIGNAL_0
;
3230 #ifdef SHIFT_INST_REGS
3231 /* I'm not sure when this following segment applies. I do know,
3232 now, that we shouldn't rewrite the regs when we were stopped
3233 by a random signal from the inferior process. */
3234 /* FIXME: Shouldn't this be based on the valid bit of the SXIP?
3235 (this is only used on the 88k). */
3237 if (!bpstat_explains_signal (stop_bpstat
)
3238 && (stop_signal
!= TARGET_SIGNAL_CHLD
)
3239 && !stopped_by_random_signal
)
3241 #endif /* SHIFT_INST_REGS */
3243 resume (currently_stepping (ecs
), stop_signal
);
3246 prepare_to_wait (ecs
);
3249 /* This function normally comes after a resume, before
3250 handle_inferior_event exits. It takes care of any last bits of
3251 housekeeping, and sets the all-important wait_some_more flag. */
3254 prepare_to_wait (struct execution_control_state
*ecs
)
3256 if (ecs
->infwait_state
== infwait_normal_state
)
3258 overlay_cache_invalid
= 1;
3260 /* We have to invalidate the registers BEFORE calling
3261 target_wait because they can be loaded from the target while
3262 in target_wait. This makes remote debugging a bit more
3263 efficient for those targets that provide critical registers
3264 as part of their normal status mechanism. */
3266 registers_changed ();
3267 ecs
->waiton_ptid
= pid_to_ptid (-1);
3268 ecs
->wp
= &(ecs
->ws
);
3270 /* This is the old end of the while loop. Let everybody know we
3271 want to wait for the inferior some more and get called again
3273 ecs
->wait_some_more
= 1;
3276 /* Print why the inferior has stopped. We always print something when
3277 the inferior exits, or receives a signal. The rest of the cases are
3278 dealt with later on in normal_stop() and print_it_typical(). Ideally
3279 there should be a call to this function from handle_inferior_event()
3280 each time stop_stepping() is called.*/
3282 print_stop_reason (enum inferior_stop_reason stop_reason
, int stop_info
)
3284 switch (stop_reason
)
3287 /* We don't deal with these cases from handle_inferior_event()
3290 case END_STEPPING_RANGE
:
3291 /* We are done with a step/next/si/ni command. */
3292 /* For now print nothing. */
3294 /* Print a message only if not in the middle of doing a "step n"
3295 operation for n > 1 */
3296 if (!step_multi
|| !stop_step
)
3297 if (ui_out_is_mi_like_p (uiout
))
3298 ui_out_field_string (uiout
, "reason", "end-stepping-range");
3301 case BREAKPOINT_HIT
:
3302 /* We found a breakpoint. */
3303 /* For now print nothing. */
3306 /* The inferior was terminated by a signal. */
3308 annotate_signalled ();
3309 if (ui_out_is_mi_like_p (uiout
))
3310 ui_out_field_string (uiout
, "reason", "exited-signalled");
3311 ui_out_text (uiout
, "\nProgram terminated with signal ");
3312 annotate_signal_name ();
3313 ui_out_field_string (uiout
, "signal-name", target_signal_to_name (stop_info
));
3314 annotate_signal_name_end ();
3315 ui_out_text (uiout
, ", ");
3316 annotate_signal_string ();
3317 ui_out_field_string (uiout
, "signal-meaning", target_signal_to_string (stop_info
));
3318 annotate_signal_string_end ();
3319 ui_out_text (uiout
, ".\n");
3320 ui_out_text (uiout
, "The program no longer exists.\n");
3322 annotate_signalled ();
3323 printf_filtered ("\nProgram terminated with signal ");
3324 annotate_signal_name ();
3325 printf_filtered ("%s", target_signal_to_name (stop_info
));
3326 annotate_signal_name_end ();
3327 printf_filtered (", ");
3328 annotate_signal_string ();
3329 printf_filtered ("%s", target_signal_to_string (stop_info
));
3330 annotate_signal_string_end ();
3331 printf_filtered (".\n");
3333 printf_filtered ("The program no longer exists.\n");
3334 gdb_flush (gdb_stdout
);
3338 /* The inferior program is finished. */
3340 annotate_exited (stop_info
);
3343 if (ui_out_is_mi_like_p (uiout
))
3344 ui_out_field_string (uiout
, "reason", "exited");
3345 ui_out_text (uiout
, "\nProgram exited with code ");
3346 ui_out_field_fmt (uiout
, "exit-code", "0%o", (unsigned int) stop_info
);
3347 ui_out_text (uiout
, ".\n");
3351 if (ui_out_is_mi_like_p (uiout
))
3352 ui_out_field_string (uiout
, "reason", "exited-normally");
3353 ui_out_text (uiout
, "\nProgram exited normally.\n");
3356 annotate_exited (stop_info
);
3358 printf_filtered ("\nProgram exited with code 0%o.\n",
3359 (unsigned int) stop_info
);
3361 printf_filtered ("\nProgram exited normally.\n");
3364 case SIGNAL_RECEIVED
:
3365 /* Signal received. The signal table tells us to print about
3369 ui_out_text (uiout
, "\nProgram received signal ");
3370 annotate_signal_name ();
3371 if (ui_out_is_mi_like_p (uiout
))
3372 ui_out_field_string (uiout
, "reason", "signal-received");
3373 ui_out_field_string (uiout
, "signal-name", target_signal_to_name (stop_info
));
3374 annotate_signal_name_end ();
3375 ui_out_text (uiout
, ", ");
3376 annotate_signal_string ();
3377 ui_out_field_string (uiout
, "signal-meaning", target_signal_to_string (stop_info
));
3378 annotate_signal_string_end ();
3379 ui_out_text (uiout
, ".\n");
3382 printf_filtered ("\nProgram received signal ");
3383 annotate_signal_name ();
3384 printf_filtered ("%s", target_signal_to_name (stop_info
));
3385 annotate_signal_name_end ();
3386 printf_filtered (", ");
3387 annotate_signal_string ();
3388 printf_filtered ("%s", target_signal_to_string (stop_info
));
3389 annotate_signal_string_end ();
3390 printf_filtered (".\n");
3391 gdb_flush (gdb_stdout
);
3395 internal_error (__FILE__
, __LINE__
,
3396 "print_stop_reason: unrecognized enum value");
3402 /* Here to return control to GDB when the inferior stops for real.
3403 Print appropriate messages, remove breakpoints, give terminal our modes.
3405 STOP_PRINT_FRAME nonzero means print the executing frame
3406 (pc, function, args, file, line number and line text).
3407 BREAKPOINTS_FAILED nonzero means stop was due to error
3408 attempting to insert breakpoints. */
3413 /* As with the notification of thread events, we want to delay
3414 notifying the user that we've switched thread context until
3415 the inferior actually stops.
3417 (Note that there's no point in saying anything if the inferior
3419 if (! ptid_equal (previous_inferior_ptid
, inferior_ptid
)
3420 && target_has_execution
)
3422 target_terminal_ours_for_output ();
3423 printf_filtered ("[Switching to %s]\n",
3424 target_pid_or_tid_to_str (inferior_ptid
));
3425 previous_inferior_ptid
= inferior_ptid
;
3428 /* Make sure that the current_frame's pc is correct. This
3429 is a correction for setting up the frame info before doing
3430 DECR_PC_AFTER_BREAK */
3431 if (target_has_execution
&& get_current_frame ())
3432 (get_current_frame ())->pc
= read_pc ();
3434 if (breakpoints_failed
)
3436 target_terminal_ours_for_output ();
3437 print_sys_errmsg ("While inserting breakpoints", breakpoints_failed
);
3438 printf_filtered ("Stopped; cannot insert breakpoints.\n\
3439 The same program may be running in another process,\n\
3440 or you may have requested too many hardware breakpoints\n\
3441 and/or watchpoints.\n");
3444 if (target_has_execution
&& breakpoints_inserted
)
3446 if (remove_breakpoints ())
3448 target_terminal_ours_for_output ();
3449 printf_filtered ("Cannot remove breakpoints because ");
3450 printf_filtered ("program is no longer writable.\n");
3451 printf_filtered ("It might be running in another process.\n");
3452 printf_filtered ("Further execution is probably impossible.\n");
3455 breakpoints_inserted
= 0;
3457 /* Delete the breakpoint we stopped at, if it wants to be deleted.
3458 Delete any breakpoint that is to be deleted at the next stop. */
3460 breakpoint_auto_delete (stop_bpstat
);
3462 /* If an auto-display called a function and that got a signal,
3463 delete that auto-display to avoid an infinite recursion. */
3465 if (stopped_by_random_signal
)
3466 disable_current_display ();
3468 /* Don't print a message if in the middle of doing a "step n"
3469 operation for n > 1 */
3470 if (step_multi
&& stop_step
)
3473 target_terminal_ours ();
3475 /* Look up the hook_stop and run it if it exists. */
3477 if (stop_command
&& stop_command
->hook_pre
)
3479 catch_errors (hook_stop_stub
, stop_command
->hook_pre
,
3480 "Error while running hook_stop:\n", RETURN_MASK_ALL
);
3483 if (!target_has_stack
)
3489 /* Select innermost stack frame - i.e., current frame is frame 0,
3490 and current location is based on that.
3491 Don't do this on return from a stack dummy routine,
3492 or if the program has exited. */
3494 if (!stop_stack_dummy
)
3496 select_frame (get_current_frame (), 0);
3498 /* Print current location without a level number, if
3499 we have changed functions or hit a breakpoint.
3500 Print source line if we have one.
3501 bpstat_print() contains the logic deciding in detail
3502 what to print, based on the event(s) that just occurred. */
3504 if (stop_print_frame
3509 int do_frame_printing
= 1;
3511 bpstat_ret
= bpstat_print (stop_bpstat
);
3516 && step_frame_address
== FRAME_FP (get_current_frame ())
3517 && step_start_function
== find_pc_function (stop_pc
))
3518 source_flag
= SRC_LINE
; /* finished step, just print source line */
3520 source_flag
= SRC_AND_LOC
; /* print location and source line */
3522 case PRINT_SRC_AND_LOC
:
3523 source_flag
= SRC_AND_LOC
; /* print location and source line */
3525 case PRINT_SRC_ONLY
:
3526 source_flag
= SRC_LINE
;
3529 source_flag
= SRC_LINE
; /* something bogus */
3530 do_frame_printing
= 0;
3533 internal_error (__FILE__
, __LINE__
,
3537 /* For mi, have the same behavior every time we stop:
3538 print everything but the source line. */
3539 if (ui_out_is_mi_like_p (uiout
))
3540 source_flag
= LOC_AND_ADDRESS
;
3544 if (ui_out_is_mi_like_p (uiout
))
3545 ui_out_field_int (uiout
, "thread-id",
3546 pid_to_thread_id (inferior_ptid
));
3548 /* The behavior of this routine with respect to the source
3550 SRC_LINE: Print only source line
3551 LOCATION: Print only location
3552 SRC_AND_LOC: Print location and source line */
3553 if (do_frame_printing
)
3554 show_and_print_stack_frame (selected_frame
, -1, source_flag
);
3556 /* Display the auto-display expressions. */
3561 /* Save the function value return registers, if we care.
3562 We might be about to restore their previous contents. */
3563 if (proceed_to_finish
)
3564 read_register_bytes (0, stop_registers
, REGISTER_BYTES
);
3566 if (stop_stack_dummy
)
3568 /* Pop the empty frame that contains the stack dummy.
3569 POP_FRAME ends with a setting of the current frame, so we
3570 can use that next. */
3572 /* Set stop_pc to what it was before we called the function.
3573 Can't rely on restore_inferior_status because that only gets
3574 called if we don't stop in the called function. */
3575 stop_pc
= read_pc ();
3576 select_frame (get_current_frame (), 0);
3580 annotate_stopped ();
3584 hook_stop_stub (void *cmd
)
3586 execute_user_command ((struct cmd_list_element
*) cmd
, 0);
3591 signal_stop_state (int signo
)
3593 return signal_stop
[signo
];
3597 signal_print_state (int signo
)
3599 return signal_print
[signo
];
3603 signal_pass_state (int signo
)
3605 return signal_program
[signo
];
3608 int signal_stop_update (signo
, state
)
3612 int ret
= signal_stop
[signo
];
3613 signal_stop
[signo
] = state
;
3617 int signal_print_update (signo
, state
)
3621 int ret
= signal_print
[signo
];
3622 signal_print
[signo
] = state
;
3626 int signal_pass_update (signo
, state
)
3630 int ret
= signal_program
[signo
];
3631 signal_program
[signo
] = state
;
3636 sig_print_header (void)
3639 Signal Stop\tPrint\tPass to program\tDescription\n");
3643 sig_print_info (enum target_signal oursig
)
3645 char *name
= target_signal_to_name (oursig
);
3646 int name_padding
= 13 - strlen (name
);
3648 if (name_padding
<= 0)
3651 printf_filtered ("%s", name
);
3652 printf_filtered ("%*.*s ", name_padding
, name_padding
,
3654 printf_filtered ("%s\t", signal_stop
[oursig
] ? "Yes" : "No");
3655 printf_filtered ("%s\t", signal_print
[oursig
] ? "Yes" : "No");
3656 printf_filtered ("%s\t\t", signal_program
[oursig
] ? "Yes" : "No");
3657 printf_filtered ("%s\n", target_signal_to_string (oursig
));
3660 /* Specify how various signals in the inferior should be handled. */
3663 handle_command (char *args
, int from_tty
)
3666 int digits
, wordlen
;
3667 int sigfirst
, signum
, siglast
;
3668 enum target_signal oursig
;
3671 unsigned char *sigs
;
3672 struct cleanup
*old_chain
;
3676 error_no_arg ("signal to handle");
3679 /* Allocate and zero an array of flags for which signals to handle. */
3681 nsigs
= (int) TARGET_SIGNAL_LAST
;
3682 sigs
= (unsigned char *) alloca (nsigs
);
3683 memset (sigs
, 0, nsigs
);
3685 /* Break the command line up into args. */
3687 argv
= buildargv (args
);
3692 old_chain
= make_cleanup_freeargv (argv
);
3694 /* Walk through the args, looking for signal oursigs, signal names, and
3695 actions. Signal numbers and signal names may be interspersed with
3696 actions, with the actions being performed for all signals cumulatively
3697 specified. Signal ranges can be specified as <LOW>-<HIGH>. */
3699 while (*argv
!= NULL
)
3701 wordlen
= strlen (*argv
);
3702 for (digits
= 0; isdigit ((*argv
)[digits
]); digits
++)
3706 sigfirst
= siglast
= -1;
3708 if (wordlen
>= 1 && !strncmp (*argv
, "all", wordlen
))
3710 /* Apply action to all signals except those used by the
3711 debugger. Silently skip those. */
3714 siglast
= nsigs
- 1;
3716 else if (wordlen
>= 1 && !strncmp (*argv
, "stop", wordlen
))
3718 SET_SIGS (nsigs
, sigs
, signal_stop
);
3719 SET_SIGS (nsigs
, sigs
, signal_print
);
3721 else if (wordlen
>= 1 && !strncmp (*argv
, "ignore", wordlen
))
3723 UNSET_SIGS (nsigs
, sigs
, signal_program
);
3725 else if (wordlen
>= 2 && !strncmp (*argv
, "print", wordlen
))
3727 SET_SIGS (nsigs
, sigs
, signal_print
);
3729 else if (wordlen
>= 2 && !strncmp (*argv
, "pass", wordlen
))
3731 SET_SIGS (nsigs
, sigs
, signal_program
);
3733 else if (wordlen
>= 3 && !strncmp (*argv
, "nostop", wordlen
))
3735 UNSET_SIGS (nsigs
, sigs
, signal_stop
);
3737 else if (wordlen
>= 3 && !strncmp (*argv
, "noignore", wordlen
))
3739 SET_SIGS (nsigs
, sigs
, signal_program
);
3741 else if (wordlen
>= 4 && !strncmp (*argv
, "noprint", wordlen
))
3743 UNSET_SIGS (nsigs
, sigs
, signal_print
);
3744 UNSET_SIGS (nsigs
, sigs
, signal_stop
);
3746 else if (wordlen
>= 4 && !strncmp (*argv
, "nopass", wordlen
))
3748 UNSET_SIGS (nsigs
, sigs
, signal_program
);
3750 else if (digits
> 0)
3752 /* It is numeric. The numeric signal refers to our own
3753 internal signal numbering from target.h, not to host/target
3754 signal number. This is a feature; users really should be
3755 using symbolic names anyway, and the common ones like
3756 SIGHUP, SIGINT, SIGALRM, etc. will work right anyway. */
3758 sigfirst
= siglast
= (int)
3759 target_signal_from_command (atoi (*argv
));
3760 if ((*argv
)[digits
] == '-')
3763 target_signal_from_command (atoi ((*argv
) + digits
+ 1));
3765 if (sigfirst
> siglast
)
3767 /* Bet he didn't figure we'd think of this case... */
3775 oursig
= target_signal_from_name (*argv
);
3776 if (oursig
!= TARGET_SIGNAL_UNKNOWN
)
3778 sigfirst
= siglast
= (int) oursig
;
3782 /* Not a number and not a recognized flag word => complain. */
3783 error ("Unrecognized or ambiguous flag word: \"%s\".", *argv
);
3787 /* If any signal numbers or symbol names were found, set flags for
3788 which signals to apply actions to. */
3790 for (signum
= sigfirst
; signum
>= 0 && signum
<= siglast
; signum
++)
3792 switch ((enum target_signal
) signum
)
3794 case TARGET_SIGNAL_TRAP
:
3795 case TARGET_SIGNAL_INT
:
3796 if (!allsigs
&& !sigs
[signum
])
3798 if (query ("%s is used by the debugger.\n\
3799 Are you sure you want to change it? ",
3800 target_signal_to_name
3801 ((enum target_signal
) signum
)))
3807 printf_unfiltered ("Not confirmed, unchanged.\n");
3808 gdb_flush (gdb_stdout
);
3812 case TARGET_SIGNAL_0
:
3813 case TARGET_SIGNAL_DEFAULT
:
3814 case TARGET_SIGNAL_UNKNOWN
:
3815 /* Make sure that "all" doesn't print these. */
3826 target_notice_signals (inferior_ptid
);
3830 /* Show the results. */
3831 sig_print_header ();
3832 for (signum
= 0; signum
< nsigs
; signum
++)
3836 sig_print_info (signum
);
3841 do_cleanups (old_chain
);
3845 xdb_handle_command (char *args
, int from_tty
)
3848 struct cleanup
*old_chain
;
3850 /* Break the command line up into args. */
3852 argv
= buildargv (args
);
3857 old_chain
= make_cleanup_freeargv (argv
);
3858 if (argv
[1] != (char *) NULL
)
3863 bufLen
= strlen (argv
[0]) + 20;
3864 argBuf
= (char *) xmalloc (bufLen
);
3868 enum target_signal oursig
;
3870 oursig
= target_signal_from_name (argv
[0]);
3871 memset (argBuf
, 0, bufLen
);
3872 if (strcmp (argv
[1], "Q") == 0)
3873 sprintf (argBuf
, "%s %s", argv
[0], "noprint");
3876 if (strcmp (argv
[1], "s") == 0)
3878 if (!signal_stop
[oursig
])
3879 sprintf (argBuf
, "%s %s", argv
[0], "stop");
3881 sprintf (argBuf
, "%s %s", argv
[0], "nostop");
3883 else if (strcmp (argv
[1], "i") == 0)
3885 if (!signal_program
[oursig
])
3886 sprintf (argBuf
, "%s %s", argv
[0], "pass");
3888 sprintf (argBuf
, "%s %s", argv
[0], "nopass");
3890 else if (strcmp (argv
[1], "r") == 0)
3892 if (!signal_print
[oursig
])
3893 sprintf (argBuf
, "%s %s", argv
[0], "print");
3895 sprintf (argBuf
, "%s %s", argv
[0], "noprint");
3901 handle_command (argBuf
, from_tty
);
3903 printf_filtered ("Invalid signal handling flag.\n");
3908 do_cleanups (old_chain
);
3911 /* Print current contents of the tables set by the handle command.
3912 It is possible we should just be printing signals actually used
3913 by the current target (but for things to work right when switching
3914 targets, all signals should be in the signal tables). */
3917 signals_info (char *signum_exp
, int from_tty
)
3919 enum target_signal oursig
;
3920 sig_print_header ();
3924 /* First see if this is a symbol name. */
3925 oursig
= target_signal_from_name (signum_exp
);
3926 if (oursig
== TARGET_SIGNAL_UNKNOWN
)
3928 /* No, try numeric. */
3930 target_signal_from_command (parse_and_eval_long (signum_exp
));
3932 sig_print_info (oursig
);
3936 printf_filtered ("\n");
3937 /* These ugly casts brought to you by the native VAX compiler. */
3938 for (oursig
= TARGET_SIGNAL_FIRST
;
3939 (int) oursig
< (int) TARGET_SIGNAL_LAST
;
3940 oursig
= (enum target_signal
) ((int) oursig
+ 1))
3944 if (oursig
!= TARGET_SIGNAL_UNKNOWN
3945 && oursig
!= TARGET_SIGNAL_DEFAULT
3946 && oursig
!= TARGET_SIGNAL_0
)
3947 sig_print_info (oursig
);
3950 printf_filtered ("\nUse the \"handle\" command to change these tables.\n");
3953 struct inferior_status
3955 enum target_signal stop_signal
;
3959 int stop_stack_dummy
;
3960 int stopped_by_random_signal
;
3962 CORE_ADDR step_range_start
;
3963 CORE_ADDR step_range_end
;
3964 CORE_ADDR step_frame_address
;
3965 enum step_over_calls_kind step_over_calls
;
3966 CORE_ADDR step_resume_break_address
;
3967 int stop_after_trap
;
3968 int stop_soon_quietly
;
3969 CORE_ADDR selected_frame_address
;
3970 char *stop_registers
;
3972 /* These are here because if call_function_by_hand has written some
3973 registers and then decides to call error(), we better not have changed
3978 int breakpoint_proceeded
;
3979 int restore_stack_info
;
3980 int proceed_to_finish
;
3983 static struct inferior_status
*
3984 xmalloc_inferior_status (void)
3986 struct inferior_status
*inf_status
;
3987 inf_status
= xmalloc (sizeof (struct inferior_status
));
3988 inf_status
->stop_registers
= xmalloc (REGISTER_BYTES
);
3989 inf_status
->registers
= xmalloc (REGISTER_BYTES
);
3994 free_inferior_status (struct inferior_status
*inf_status
)
3996 xfree (inf_status
->registers
);
3997 xfree (inf_status
->stop_registers
);
4002 write_inferior_status_register (struct inferior_status
*inf_status
, int regno
,
4005 int size
= REGISTER_RAW_SIZE (regno
);
4006 void *buf
= alloca (size
);
4007 store_signed_integer (buf
, size
, val
);
4008 memcpy (&inf_status
->registers
[REGISTER_BYTE (regno
)], buf
, size
);
4011 /* Save all of the information associated with the inferior<==>gdb
4012 connection. INF_STATUS is a pointer to a "struct inferior_status"
4013 (defined in inferior.h). */
4015 struct inferior_status
*
4016 save_inferior_status (int restore_stack_info
)
4018 struct inferior_status
*inf_status
= xmalloc_inferior_status ();
4020 inf_status
->stop_signal
= stop_signal
;
4021 inf_status
->stop_pc
= stop_pc
;
4022 inf_status
->stop_step
= stop_step
;
4023 inf_status
->stop_stack_dummy
= stop_stack_dummy
;
4024 inf_status
->stopped_by_random_signal
= stopped_by_random_signal
;
4025 inf_status
->trap_expected
= trap_expected
;
4026 inf_status
->step_range_start
= step_range_start
;
4027 inf_status
->step_range_end
= step_range_end
;
4028 inf_status
->step_frame_address
= step_frame_address
;
4029 inf_status
->step_over_calls
= step_over_calls
;
4030 inf_status
->stop_after_trap
= stop_after_trap
;
4031 inf_status
->stop_soon_quietly
= stop_soon_quietly
;
4032 /* Save original bpstat chain here; replace it with copy of chain.
4033 If caller's caller is walking the chain, they'll be happier if we
4034 hand them back the original chain when restore_inferior_status is
4036 inf_status
->stop_bpstat
= stop_bpstat
;
4037 stop_bpstat
= bpstat_copy (stop_bpstat
);
4038 inf_status
->breakpoint_proceeded
= breakpoint_proceeded
;
4039 inf_status
->restore_stack_info
= restore_stack_info
;
4040 inf_status
->proceed_to_finish
= proceed_to_finish
;
4042 memcpy (inf_status
->stop_registers
, stop_registers
, REGISTER_BYTES
);
4044 read_register_bytes (0, inf_status
->registers
, REGISTER_BYTES
);
4046 record_selected_frame (&(inf_status
->selected_frame_address
),
4047 &(inf_status
->selected_level
));
4051 struct restore_selected_frame_args
4053 CORE_ADDR frame_address
;
4058 restore_selected_frame (void *args
)
4060 struct restore_selected_frame_args
*fr
=
4061 (struct restore_selected_frame_args
*) args
;
4062 struct frame_info
*frame
;
4063 int level
= fr
->level
;
4065 frame
= find_relative_frame (get_current_frame (), &level
);
4067 /* If inf_status->selected_frame_address is NULL, there was no
4068 previously selected frame. */
4069 if (frame
== NULL
||
4070 /* FRAME_FP (frame) != fr->frame_address || */
4071 /* elz: deleted this check as a quick fix to the problem that
4072 for function called by hand gdb creates no internal frame
4073 structure and the real stack and gdb's idea of stack are
4074 different if nested calls by hands are made.
4076 mvs: this worries me. */
4079 warning ("Unable to restore previously selected frame.\n");
4083 select_frame (frame
, fr
->level
);
4089 restore_inferior_status (struct inferior_status
*inf_status
)
4091 stop_signal
= inf_status
->stop_signal
;
4092 stop_pc
= inf_status
->stop_pc
;
4093 stop_step
= inf_status
->stop_step
;
4094 stop_stack_dummy
= inf_status
->stop_stack_dummy
;
4095 stopped_by_random_signal
= inf_status
->stopped_by_random_signal
;
4096 trap_expected
= inf_status
->trap_expected
;
4097 step_range_start
= inf_status
->step_range_start
;
4098 step_range_end
= inf_status
->step_range_end
;
4099 step_frame_address
= inf_status
->step_frame_address
;
4100 step_over_calls
= inf_status
->step_over_calls
;
4101 stop_after_trap
= inf_status
->stop_after_trap
;
4102 stop_soon_quietly
= inf_status
->stop_soon_quietly
;
4103 bpstat_clear (&stop_bpstat
);
4104 stop_bpstat
= inf_status
->stop_bpstat
;
4105 breakpoint_proceeded
= inf_status
->breakpoint_proceeded
;
4106 proceed_to_finish
= inf_status
->proceed_to_finish
;
4108 /* FIXME: Is the restore of stop_registers always needed */
4109 memcpy (stop_registers
, inf_status
->stop_registers
, REGISTER_BYTES
);
4111 /* The inferior can be gone if the user types "print exit(0)"
4112 (and perhaps other times). */
4113 if (target_has_execution
)
4114 write_register_bytes (0, inf_status
->registers
, REGISTER_BYTES
);
4116 /* FIXME: If we are being called after stopping in a function which
4117 is called from gdb, we should not be trying to restore the
4118 selected frame; it just prints a spurious error message (The
4119 message is useful, however, in detecting bugs in gdb (like if gdb
4120 clobbers the stack)). In fact, should we be restoring the
4121 inferior status at all in that case? . */
4123 if (target_has_stack
&& inf_status
->restore_stack_info
)
4125 struct restore_selected_frame_args fr
;
4126 fr
.level
= inf_status
->selected_level
;
4127 fr
.frame_address
= inf_status
->selected_frame_address
;
4128 /* The point of catch_errors is that if the stack is clobbered,
4129 walking the stack might encounter a garbage pointer and error()
4130 trying to dereference it. */
4131 if (catch_errors (restore_selected_frame
, &fr
,
4132 "Unable to restore previously selected frame:\n",
4133 RETURN_MASK_ERROR
) == 0)
4134 /* Error in restoring the selected frame. Select the innermost
4138 select_frame (get_current_frame (), 0);
4142 free_inferior_status (inf_status
);
4146 do_restore_inferior_status_cleanup (void *sts
)
4148 restore_inferior_status (sts
);
4152 make_cleanup_restore_inferior_status (struct inferior_status
*inf_status
)
4154 return make_cleanup (do_restore_inferior_status_cleanup
, inf_status
);
4158 discard_inferior_status (struct inferior_status
*inf_status
)
4160 /* See save_inferior_status for info on stop_bpstat. */
4161 bpstat_clear (&inf_status
->stop_bpstat
);
4162 free_inferior_status (inf_status
);
4165 /* Oft used ptids */
4167 ptid_t minus_one_ptid
;
4169 /* Create a ptid given the necessary PID, LWP, and TID components. */
4172 ptid_build (int pid
, long lwp
, long tid
)
4182 /* Create a ptid from just a pid. */
4185 pid_to_ptid (int pid
)
4187 return ptid_build (pid
, 0, 0);
4190 /* Fetch the pid (process id) component from a ptid. */
4193 ptid_get_pid (ptid_t ptid
)
4198 /* Fetch the lwp (lightweight process) component from a ptid. */
4201 ptid_get_lwp (ptid_t ptid
)
4206 /* Fetch the tid (thread id) component from a ptid. */
4209 ptid_get_tid (ptid_t ptid
)
4214 /* ptid_equal() is used to test equality of two ptids. */
4217 ptid_equal (ptid_t ptid1
, ptid_t ptid2
)
4219 return (ptid1
.pid
== ptid2
.pid
&& ptid1
.lwp
== ptid2
.lwp
4220 && ptid1
.tid
== ptid2
.tid
);
4223 /* restore_inferior_ptid() will be used by the cleanup machinery
4224 to restore the inferior_ptid value saved in a call to
4225 save_inferior_ptid(). */
4228 restore_inferior_ptid (void *arg
)
4230 ptid_t
*saved_ptid_ptr
= arg
;
4231 inferior_ptid
= *saved_ptid_ptr
;
4235 /* Save the value of inferior_ptid so that it may be restored by a
4236 later call to do_cleanups(). Returns the struct cleanup pointer
4237 needed for later doing the cleanup. */
4240 save_inferior_ptid (void)
4242 ptid_t
*saved_ptid_ptr
;
4244 saved_ptid_ptr
= xmalloc (sizeof (ptid_t
));
4245 *saved_ptid_ptr
= inferior_ptid
;
4246 return make_cleanup (restore_inferior_ptid
, saved_ptid_ptr
);
4253 stop_registers
= xmalloc (REGISTER_BYTES
);
4257 _initialize_infrun (void)
4260 register int numsigs
;
4261 struct cmd_list_element
*c
;
4265 register_gdbarch_swap (&stop_registers
, sizeof (stop_registers
), NULL
);
4266 register_gdbarch_swap (NULL
, 0, build_infrun
);
4268 add_info ("signals", signals_info
,
4269 "What debugger does when program gets various signals.\n\
4270 Specify a signal as argument to print info on that signal only.");
4271 add_info_alias ("handle", "signals", 0);
4273 add_com ("handle", class_run
, handle_command
,
4274 concat ("Specify how to handle a signal.\n\
4275 Args are signals and actions to apply to those signals.\n\
4276 Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\
4277 from 1-15 are allowed for compatibility with old versions of GDB.\n\
4278 Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\
4279 The special arg \"all\" is recognized to mean all signals except those\n\
4280 used by the debugger, typically SIGTRAP and SIGINT.\n",
4281 "Recognized actions include \"stop\", \"nostop\", \"print\", \"noprint\",\n\
4282 \"pass\", \"nopass\", \"ignore\", or \"noignore\".\n\
4283 Stop means reenter debugger if this signal happens (implies print).\n\
4284 Print means print a message if this signal happens.\n\
4285 Pass means let program see this signal; otherwise program doesn't know.\n\
4286 Ignore is a synonym for nopass and noignore is a synonym for pass.\n\
4287 Pass and Stop may be combined.", NULL
));
4290 add_com ("lz", class_info
, signals_info
,
4291 "What debugger does when program gets various signals.\n\
4292 Specify a signal as argument to print info on that signal only.");
4293 add_com ("z", class_run
, xdb_handle_command
,
4294 concat ("Specify how to handle a signal.\n\
4295 Args are signals and actions to apply to those signals.\n\
4296 Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\
4297 from 1-15 are allowed for compatibility with old versions of GDB.\n\
4298 Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\
4299 The special arg \"all\" is recognized to mean all signals except those\n\
4300 used by the debugger, typically SIGTRAP and SIGINT.\n",
4301 "Recognized actions include \"s\" (toggles between stop and nostop), \n\
4302 \"r\" (toggles between print and noprint), \"i\" (toggles between pass and \
4303 nopass), \"Q\" (noprint)\n\
4304 Stop means reenter debugger if this signal happens (implies print).\n\
4305 Print means print a message if this signal happens.\n\
4306 Pass means let program see this signal; otherwise program doesn't know.\n\
4307 Ignore is a synonym for nopass and noignore is a synonym for pass.\n\
4308 Pass and Stop may be combined.", NULL
));
4312 stop_command
= add_cmd ("stop", class_obscure
, not_just_help_class_command
,
4313 "There is no `stop' command, but you can set a hook on `stop'.\n\
4314 This allows you to set a list of commands to be run each time execution\n\
4315 of the program stops.", &cmdlist
);
4317 numsigs
= (int) TARGET_SIGNAL_LAST
;
4318 signal_stop
= (unsigned char *)
4319 xmalloc (sizeof (signal_stop
[0]) * numsigs
);
4320 signal_print
= (unsigned char *)
4321 xmalloc (sizeof (signal_print
[0]) * numsigs
);
4322 signal_program
= (unsigned char *)
4323 xmalloc (sizeof (signal_program
[0]) * numsigs
);
4324 for (i
= 0; i
< numsigs
; i
++)
4327 signal_print
[i
] = 1;
4328 signal_program
[i
] = 1;
4331 /* Signals caused by debugger's own actions
4332 should not be given to the program afterwards. */
4333 signal_program
[TARGET_SIGNAL_TRAP
] = 0;
4334 signal_program
[TARGET_SIGNAL_INT
] = 0;
4336 /* Signals that are not errors should not normally enter the debugger. */
4337 signal_stop
[TARGET_SIGNAL_ALRM
] = 0;
4338 signal_print
[TARGET_SIGNAL_ALRM
] = 0;
4339 signal_stop
[TARGET_SIGNAL_VTALRM
] = 0;
4340 signal_print
[TARGET_SIGNAL_VTALRM
] = 0;
4341 signal_stop
[TARGET_SIGNAL_PROF
] = 0;
4342 signal_print
[TARGET_SIGNAL_PROF
] = 0;
4343 signal_stop
[TARGET_SIGNAL_CHLD
] = 0;
4344 signal_print
[TARGET_SIGNAL_CHLD
] = 0;
4345 signal_stop
[TARGET_SIGNAL_IO
] = 0;
4346 signal_print
[TARGET_SIGNAL_IO
] = 0;
4347 signal_stop
[TARGET_SIGNAL_POLL
] = 0;
4348 signal_print
[TARGET_SIGNAL_POLL
] = 0;
4349 signal_stop
[TARGET_SIGNAL_URG
] = 0;
4350 signal_print
[TARGET_SIGNAL_URG
] = 0;
4351 signal_stop
[TARGET_SIGNAL_WINCH
] = 0;
4352 signal_print
[TARGET_SIGNAL_WINCH
] = 0;
4354 /* These signals are used internally by user-level thread
4355 implementations. (See signal(5) on Solaris.) Like the above
4356 signals, a healthy program receives and handles them as part of
4357 its normal operation. */
4358 signal_stop
[TARGET_SIGNAL_LWP
] = 0;
4359 signal_print
[TARGET_SIGNAL_LWP
] = 0;
4360 signal_stop
[TARGET_SIGNAL_WAITING
] = 0;
4361 signal_print
[TARGET_SIGNAL_WAITING
] = 0;
4362 signal_stop
[TARGET_SIGNAL_CANCEL
] = 0;
4363 signal_print
[TARGET_SIGNAL_CANCEL
] = 0;
4367 (add_set_cmd ("stop-on-solib-events", class_support
, var_zinteger
,
4368 (char *) &stop_on_solib_events
,
4369 "Set stopping for shared library events.\n\
4370 If nonzero, gdb will give control to the user when the dynamic linker\n\
4371 notifies gdb of shared library events. The most common event of interest\n\
4372 to the user would be loading/unloading of a new library.\n",
4377 c
= add_set_enum_cmd ("follow-fork-mode",
4379 follow_fork_mode_kind_names
,
4380 &follow_fork_mode_string
,
4381 /* ??rehrauer: The "both" option is broken, by what may be a 10.20
4382 kernel problem. It's also not terribly useful without a GUI to
4383 help the user drive two debuggers. So for now, I'm disabling
4384 the "both" option. */
4385 /* "Set debugger response to a program call of fork \
4387 A fork or vfork creates a new process. follow-fork-mode can be:\n\
4388 parent - the original process is debugged after a fork\n\
4389 child - the new process is debugged after a fork\n\
4390 both - both the parent and child are debugged after a fork\n\
4391 ask - the debugger will ask for one of the above choices\n\
4392 For \"both\", another copy of the debugger will be started to follow\n\
4393 the new child process. The original debugger will continue to follow\n\
4394 the original parent process. To distinguish their prompts, the\n\
4395 debugger copy's prompt will be changed.\n\
4396 For \"parent\" or \"child\", the unfollowed process will run free.\n\
4397 By default, the debugger will follow the parent process.",
4399 "Set debugger response to a program call of fork \
4401 A fork or vfork creates a new process. follow-fork-mode can be:\n\
4402 parent - the original process is debugged after a fork\n\
4403 child - the new process is debugged after a fork\n\
4404 ask - the debugger will ask for one of the above choices\n\
4405 For \"parent\" or \"child\", the unfollowed process will run free.\n\
4406 By default, the debugger will follow the parent process.",
4408 /* c->function.sfunc = ; */
4409 add_show_from_set (c
, &showlist
);
4411 c
= add_set_enum_cmd ("scheduler-locking", class_run
,
4412 scheduler_enums
, /* array of string names */
4413 &scheduler_mode
, /* current mode */
4414 "Set mode for locking scheduler during execution.\n\
4415 off == no locking (threads may preempt at any time)\n\
4416 on == full locking (no thread except the current thread may run)\n\
4417 step == scheduler locked during every single-step operation.\n\
4418 In this mode, no other thread may run during a step command.\n\
4419 Other threads may run while stepping over a function call ('next').",
4422 c
->function
.sfunc
= set_schedlock_func
; /* traps on target vector */
4423 add_show_from_set (c
, &showlist
);
4425 c
= add_set_cmd ("step-mode", class_run
,
4426 var_boolean
, (char*) &step_stop_if_no_debug
,
4427 "Set mode of the step operation. When set, doing a step over a\n\
4428 function without debug line information will stop at the first\n\
4429 instruction of that function. Otherwise, the function is skipped and\n\
4430 the step command stops at a different source line.",
4432 add_show_from_set (c
, &showlist
);
4434 /* ptid initializations */
4435 null_ptid
= ptid_build (0, 0, 0);
4436 minus_one_ptid
= ptid_build (-1, 0, 0);
4437 inferior_ptid
= null_ptid
;
4438 target_last_wait_ptid
= minus_one_ptid
;