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"
33 #include "gdbthread.h"
41 /* Prototypes for local functions */
43 static void signals_info (char *, int);
45 static void handle_command (char *, int);
47 static void sig_print_info (enum target_signal
);
49 static void sig_print_header (void);
51 static void resume_cleanups (void *);
53 static int hook_stop_stub (void *);
55 static void delete_breakpoint_current_contents (void *);
57 static void set_follow_fork_mode_command (char *arg
, int from_tty
,
58 struct cmd_list_element
* c
);
60 static struct inferior_status
*xmalloc_inferior_status (void);
62 static void free_inferior_status (struct inferior_status
*);
64 static int restore_selected_frame (void *);
66 static void build_infrun (void);
68 static void follow_inferior_fork (int parent_pid
, int child_pid
,
69 int has_forked
, int has_vforked
);
71 static void follow_fork (int parent_pid
, int child_pid
);
73 static void follow_vfork (int parent_pid
, int child_pid
);
75 static void set_schedlock_func (char *args
, int from_tty
,
76 struct cmd_list_element
* c
);
78 struct execution_control_state
;
80 static int currently_stepping (struct execution_control_state
*ecs
);
82 static void xdb_handle_command (char *args
, int from_tty
);
84 void _initialize_infrun (void);
86 int inferior_ignoring_startup_exec_events
= 0;
87 int inferior_ignoring_leading_exec_events
= 0;
89 /* When set, stop the 'step' command if we enter a function which has
90 no line number information. The normal behavior is that we step
91 over such function. */
92 int step_stop_if_no_debug
= 0;
94 /* In asynchronous mode, but simulating synchronous execution. */
96 int sync_execution
= 0;
98 /* wait_for_inferior and normal_stop use this to notify the user
99 when the inferior stopped in a different thread than it had been
102 static ptid_t previous_inferior_ptid
;
104 /* This is true for configurations that may follow through execl() and
105 similar functions. At present this is only true for HP-UX native. */
107 #ifndef MAY_FOLLOW_EXEC
108 #define MAY_FOLLOW_EXEC (0)
111 static int may_follow_exec
= MAY_FOLLOW_EXEC
;
113 /* GET_LONGJMP_TARGET returns the PC at which longjmp() will resume the
114 program. It needs to examine the jmp_buf argument and extract the PC
115 from it. The return value is non-zero on success, zero otherwise. */
117 #ifndef GET_LONGJMP_TARGET
118 #define GET_LONGJMP_TARGET(PC_ADDR) 0
122 /* Some machines have trampoline code that sits between function callers
123 and the actual functions themselves. If this machine doesn't have
124 such things, disable their processing. */
126 #ifndef SKIP_TRAMPOLINE_CODE
127 #define SKIP_TRAMPOLINE_CODE(pc) 0
130 /* Dynamic function trampolines are similar to solib trampolines in that they
131 are between the caller and the callee. The difference is that when you
132 enter a dynamic trampoline, you can't determine the callee's address. Some
133 (usually complex) code needs to run in the dynamic trampoline to figure out
134 the callee's address. This macro is usually called twice. First, when we
135 enter the trampoline (looks like a normal function call at that point). It
136 should return the PC of a point within the trampoline where the callee's
137 address is known. Second, when we hit the breakpoint, this routine returns
138 the callee's address. At that point, things proceed as per a step resume
141 #ifndef DYNAMIC_TRAMPOLINE_NEXTPC
142 #define DYNAMIC_TRAMPOLINE_NEXTPC(pc) 0
145 /* If the program uses ELF-style shared libraries, then calls to
146 functions in shared libraries go through stubs, which live in a
147 table called the PLT (Procedure Linkage Table). The first time the
148 function is called, the stub sends control to the dynamic linker,
149 which looks up the function's real address, patches the stub so
150 that future calls will go directly to the function, and then passes
151 control to the function.
153 If we are stepping at the source level, we don't want to see any of
154 this --- we just want to skip over the stub and the dynamic linker.
155 The simple approach is to single-step until control leaves the
158 However, on some systems (e.g., Red Hat Linux 5.2) the dynamic
159 linker calls functions in the shared C library, so you can't tell
160 from the PC alone whether the dynamic linker is still running. In
161 this case, we use a step-resume breakpoint to get us past the
162 dynamic linker, as if we were using "next" to step over a function
165 IN_SOLIB_DYNSYM_RESOLVE_CODE says whether we're in the dynamic
166 linker code or not. Normally, this means we single-step. However,
167 if SKIP_SOLIB_RESOLVER then returns non-zero, then its value is an
168 address where we can place a step-resume breakpoint to get past the
169 linker's symbol resolution function.
171 IN_SOLIB_DYNSYM_RESOLVE_CODE can generally be implemented in a
172 pretty portable way, by comparing the PC against the address ranges
173 of the dynamic linker's sections.
175 SKIP_SOLIB_RESOLVER is generally going to be system-specific, since
176 it depends on internal details of the dynamic linker. It's usually
177 not too hard to figure out where to put a breakpoint, but it
178 certainly isn't portable. SKIP_SOLIB_RESOLVER should do plenty of
179 sanity checking. If it can't figure things out, returning zero and
180 getting the (possibly confusing) stepping behavior is better than
181 signalling an error, which will obscure the change in the
184 #ifndef IN_SOLIB_DYNSYM_RESOLVE_CODE
185 #define IN_SOLIB_DYNSYM_RESOLVE_CODE(pc) 0
188 #ifndef SKIP_SOLIB_RESOLVER
189 #define SKIP_SOLIB_RESOLVER(pc) 0
192 /* For SVR4 shared libraries, each call goes through a small piece of
193 trampoline code in the ".plt" section. IN_SOLIB_CALL_TRAMPOLINE evaluates
194 to nonzero if we are current stopped in one of these. */
196 #ifndef IN_SOLIB_CALL_TRAMPOLINE
197 #define IN_SOLIB_CALL_TRAMPOLINE(pc,name) 0
200 /* In some shared library schemes, the return path from a shared library
201 call may need to go through a trampoline too. */
203 #ifndef IN_SOLIB_RETURN_TRAMPOLINE
204 #define IN_SOLIB_RETURN_TRAMPOLINE(pc,name) 0
207 /* This function returns TRUE if pc is the address of an instruction
208 that lies within the dynamic linker (such as the event hook, or the
211 This function must be used only when a dynamic linker event has
212 been caught, and the inferior is being stepped out of the hook, or
213 undefined results are guaranteed. */
215 #ifndef SOLIB_IN_DYNAMIC_LINKER
216 #define SOLIB_IN_DYNAMIC_LINKER(pid,pc) 0
219 /* On MIPS16, a function that returns a floating point value may call
220 a library helper function to copy the return value to a floating point
221 register. The IGNORE_HELPER_CALL macro returns non-zero if we
222 should ignore (i.e. step over) this function call. */
223 #ifndef IGNORE_HELPER_CALL
224 #define IGNORE_HELPER_CALL(pc) 0
227 /* On some systems, the PC may be left pointing at an instruction that won't
228 actually be executed. This is usually indicated by a bit in the PSW. If
229 we find ourselves in such a state, then we step the target beyond the
230 nullified instruction before returning control to the user so as to avoid
233 #ifndef INSTRUCTION_NULLIFIED
234 #define INSTRUCTION_NULLIFIED 0
237 /* We can't step off a permanent breakpoint in the ordinary way, because we
238 can't remove it. Instead, we have to advance the PC to the next
239 instruction. This macro should expand to a pointer to a function that
240 does that, or zero if we have no such function. If we don't have a
241 definition for it, we have to report an error. */
242 #ifndef SKIP_PERMANENT_BREAKPOINT
243 #define SKIP_PERMANENT_BREAKPOINT (default_skip_permanent_breakpoint)
245 default_skip_permanent_breakpoint (void)
248 fprintf_filtered (gdb_stderr
, "\
249 The program is stopped at a permanent breakpoint, but GDB does not know\n\
250 how to step past a permanent breakpoint on this architecture. Try using\n\
251 a command like `return' or `jump' to continue execution.\n");
252 return_to_top_level (RETURN_ERROR
);
257 /* Convert the #defines into values. This is temporary until wfi control
258 flow is completely sorted out. */
260 #ifndef HAVE_STEPPABLE_WATCHPOINT
261 #define HAVE_STEPPABLE_WATCHPOINT 0
263 #undef HAVE_STEPPABLE_WATCHPOINT
264 #define HAVE_STEPPABLE_WATCHPOINT 1
267 #ifndef HAVE_NONSTEPPABLE_WATCHPOINT
268 #define HAVE_NONSTEPPABLE_WATCHPOINT 0
270 #undef HAVE_NONSTEPPABLE_WATCHPOINT
271 #define HAVE_NONSTEPPABLE_WATCHPOINT 1
274 #ifndef HAVE_CONTINUABLE_WATCHPOINT
275 #define HAVE_CONTINUABLE_WATCHPOINT 0
277 #undef HAVE_CONTINUABLE_WATCHPOINT
278 #define HAVE_CONTINUABLE_WATCHPOINT 1
281 #ifndef CANNOT_STEP_HW_WATCHPOINTS
282 #define CANNOT_STEP_HW_WATCHPOINTS 0
284 #undef CANNOT_STEP_HW_WATCHPOINTS
285 #define CANNOT_STEP_HW_WATCHPOINTS 1
288 /* Tables of how to react to signals; the user sets them. */
290 static unsigned char *signal_stop
;
291 static unsigned char *signal_print
;
292 static unsigned char *signal_program
;
294 #define SET_SIGS(nsigs,sigs,flags) \
296 int signum = (nsigs); \
297 while (signum-- > 0) \
298 if ((sigs)[signum]) \
299 (flags)[signum] = 1; \
302 #define UNSET_SIGS(nsigs,sigs,flags) \
304 int signum = (nsigs); \
305 while (signum-- > 0) \
306 if ((sigs)[signum]) \
307 (flags)[signum] = 0; \
310 /* Value to pass to target_resume() to cause all threads to resume */
312 #define RESUME_ALL (pid_to_ptid (-1))
314 /* Command list pointer for the "stop" placeholder. */
316 static struct cmd_list_element
*stop_command
;
318 /* Nonzero if breakpoints are now inserted in the inferior. */
320 static int breakpoints_inserted
;
322 /* Function inferior was in as of last step command. */
324 static struct symbol
*step_start_function
;
326 /* Nonzero if we are expecting a trace trap and should proceed from it. */
328 static int trap_expected
;
331 /* Nonzero if we want to give control to the user when we're notified
332 of shared library events by the dynamic linker. */
333 static int stop_on_solib_events
;
337 /* Nonzero if the next time we try to continue the inferior, it will
338 step one instruction and generate a spurious trace trap.
339 This is used to compensate for a bug in HP-UX. */
341 static int trap_expected_after_continue
;
344 /* Nonzero means expecting a trace trap
345 and should stop the inferior and return silently when it happens. */
349 /* Nonzero means expecting a trap and caller will handle it themselves.
350 It is used after attach, due to attaching to a process;
351 when running in the shell before the child program has been exec'd;
352 and when running some kinds of remote stuff (FIXME?). */
354 int stop_soon_quietly
;
356 /* Nonzero if proceed is being used for a "finish" command or a similar
357 situation when stop_registers should be saved. */
359 int proceed_to_finish
;
361 /* Save register contents here when about to pop a stack dummy frame,
362 if-and-only-if proceed_to_finish is set.
363 Thus this contains the return value from the called function (assuming
364 values are returned in a register). */
366 char *stop_registers
;
368 /* Nonzero if program stopped due to error trying to insert breakpoints. */
370 static int breakpoints_failed
;
372 /* Nonzero after stop if current stack frame should be printed. */
374 static int stop_print_frame
;
376 static struct breakpoint
*step_resume_breakpoint
= NULL
;
377 static struct breakpoint
*through_sigtramp_breakpoint
= NULL
;
379 /* On some platforms (e.g., HP-UX), hardware watchpoints have bad
380 interactions with an inferior that is running a kernel function
381 (aka, a system call or "syscall"). wait_for_inferior therefore
382 may have a need to know when the inferior is in a syscall. This
383 is a count of the number of inferior threads which are known to
384 currently be running in a syscall. */
385 static int number_of_threads_in_syscalls
;
387 /* This is a cached copy of the pid/waitstatus of the last event
388 returned by target_wait()/target_wait_hook(). This information is
389 returned by get_last_target_status(). */
390 static ptid_t target_last_wait_ptid
;
391 static struct target_waitstatus target_last_waitstatus
;
393 /* This is used to remember when a fork, vfork or exec event
394 was caught by a catchpoint, and thus the event is to be
395 followed at the next resume of the inferior, and not
399 enum target_waitkind kind
;
409 char *execd_pathname
;
413 /* Some platforms don't allow us to do anything meaningful with a
414 vforked child until it has exec'd. Vforked processes on such
415 platforms can only be followed after they've exec'd.
417 When this is set to 0, a vfork can be immediately followed,
418 and an exec can be followed merely as an exec. When this is
419 set to 1, a vfork event has been seen, but cannot be followed
420 until the exec is seen.
422 (In the latter case, inferior_ptid is still the parent of the
423 vfork, and pending_follow.fork_event.child_pid is the child. The
424 appropriate process is followed, according to the setting of
425 follow-fork-mode.) */
426 static int follow_vfork_when_exec
;
428 static const char follow_fork_mode_ask
[] = "ask";
429 static const char follow_fork_mode_both
[] = "both";
430 static const char follow_fork_mode_child
[] = "child";
431 static const char follow_fork_mode_parent
[] = "parent";
433 static const char *follow_fork_mode_kind_names
[] =
435 follow_fork_mode_ask
,
436 /* ??rehrauer: The "both" option is broken, by what may be a 10.20
437 kernel problem. It's also not terribly useful without a GUI to
438 help the user drive two debuggers. So for now, I'm disabling the
440 /* follow_fork_mode_both, */
441 follow_fork_mode_child
,
442 follow_fork_mode_parent
,
446 static const char *follow_fork_mode_string
= follow_fork_mode_parent
;
450 follow_inferior_fork (int parent_pid
, int child_pid
, int has_forked
,
453 int followed_parent
= 0;
454 int followed_child
= 0;
456 /* Which process did the user want us to follow? */
457 const char *follow_mode
= follow_fork_mode_string
;
459 /* Or, did the user not know, and want us to ask? */
460 if (follow_fork_mode_string
== follow_fork_mode_ask
)
462 internal_error (__FILE__
, __LINE__
,
463 "follow_inferior_fork: \"ask\" mode not implemented");
464 /* follow_mode = follow_fork_mode_...; */
467 /* If we're to be following the parent, then detach from child_pid.
468 We're already following the parent, so need do nothing explicit
470 if (follow_mode
== follow_fork_mode_parent
)
474 /* We're already attached to the parent, by default. */
476 /* Before detaching from the child, remove all breakpoints from
477 it. (This won't actually modify the breakpoint list, but will
478 physically remove the breakpoints from the child.) */
479 if (!has_vforked
|| !follow_vfork_when_exec
)
481 detach_breakpoints (child_pid
);
482 #ifdef SOLIB_REMOVE_INFERIOR_HOOK
483 SOLIB_REMOVE_INFERIOR_HOOK (child_pid
);
487 /* Detach from the child. */
490 target_require_detach (child_pid
, "", 1);
493 /* If we're to be following the child, then attach to it, detach
494 from inferior_ptid, and set inferior_ptid to child_pid. */
495 else if (follow_mode
== follow_fork_mode_child
)
497 char child_pid_spelling
[100]; /* Arbitrary length. */
501 /* Before detaching from the parent, detach all breakpoints from
502 the child. But only if we're forking, or if we follow vforks
503 as soon as they happen. (If we're following vforks only when
504 the child has exec'd, then it's very wrong to try to write
505 back the "shadow contents" of inserted breakpoints now -- they
506 belong to the child's pre-exec'd a.out.) */
507 if (!has_vforked
|| !follow_vfork_when_exec
)
509 detach_breakpoints (child_pid
);
512 /* Before detaching from the parent, remove all breakpoints from it. */
513 remove_breakpoints ();
515 /* Also reset the solib inferior hook from the parent. */
516 #ifdef SOLIB_REMOVE_INFERIOR_HOOK
517 SOLIB_REMOVE_INFERIOR_HOOK (PIDGET (inferior_ptid
));
520 /* Detach from the parent. */
522 target_detach (NULL
, 1);
524 /* Attach to the child. */
525 inferior_ptid
= pid_to_ptid (child_pid
);
526 sprintf (child_pid_spelling
, "%d", child_pid
);
529 target_require_attach (child_pid_spelling
, 1);
531 /* Was there a step_resume breakpoint? (There was if the user
532 did a "next" at the fork() call.) If so, explicitly reset its
535 step_resumes are a form of bp that are made to be per-thread.
536 Since we created the step_resume bp when the parent process
537 was being debugged, and now are switching to the child process,
538 from the breakpoint package's viewpoint, that's a switch of
539 "threads". We must update the bp's notion of which thread
540 it is for, or it'll be ignored when it triggers... */
541 if (step_resume_breakpoint
&&
542 (!has_vforked
|| !follow_vfork_when_exec
))
543 breakpoint_re_set_thread (step_resume_breakpoint
);
545 /* Reinsert all breakpoints in the child. (The user may've set
546 breakpoints after catching the fork, in which case those
547 actually didn't get set in the child, but only in the parent.) */
548 if (!has_vforked
|| !follow_vfork_when_exec
)
550 breakpoint_re_set ();
551 insert_breakpoints ();
555 /* If we're to be following both parent and child, then fork ourselves,
556 and attach the debugger clone to the child. */
557 else if (follow_mode
== follow_fork_mode_both
)
559 char pid_suffix
[100]; /* Arbitrary length. */
561 /* Clone ourselves to follow the child. This is the end of our
562 involvement with child_pid; our clone will take it from here... */
564 target_clone_and_follow_inferior (child_pid
, &followed_child
);
565 followed_parent
= !followed_child
;
567 /* We continue to follow the parent. To help distinguish the two
568 debuggers, though, both we and our clone will reset our prompts. */
569 sprintf (pid_suffix
, "[%d] ", PIDGET (inferior_ptid
));
570 set_prompt (strcat (get_prompt (), pid_suffix
));
573 /* The parent and child of a vfork share the same address space.
574 Also, on some targets the order in which vfork and exec events
575 are received for parent in child requires some delicate handling
578 For instance, on ptrace-based HPUX we receive the child's vfork
579 event first, at which time the parent has been suspended by the
580 OS and is essentially untouchable until the child's exit or second
581 exec event arrives. At that time, the parent's vfork event is
582 delivered to us, and that's when we see and decide how to follow
583 the vfork. But to get to that point, we must continue the child
584 until it execs or exits. To do that smoothly, all breakpoints
585 must be removed from the child, in case there are any set between
586 the vfork() and exec() calls. But removing them from the child
587 also removes them from the parent, due to the shared-address-space
588 nature of a vfork'd parent and child. On HPUX, therefore, we must
589 take care to restore the bp's to the parent before we continue it.
590 Else, it's likely that we may not stop in the expected place. (The
591 worst scenario is when the user tries to step over a vfork() call;
592 the step-resume bp must be restored for the step to properly stop
593 in the parent after the call completes!)
595 Sequence of events, as reported to gdb from HPUX:
597 Parent Child Action for gdb to take
598 -------------------------------------------------------
599 1 VFORK Continue child
605 target_post_follow_vfork (parent_pid
,
611 pending_follow
.fork_event
.saw_parent_fork
= 0;
612 pending_follow
.fork_event
.saw_child_fork
= 0;
616 follow_fork (int parent_pid
, int child_pid
)
618 follow_inferior_fork (parent_pid
, child_pid
, 1, 0);
622 /* Forward declaration. */
623 static void follow_exec (int, char *);
626 follow_vfork (int parent_pid
, int child_pid
)
628 follow_inferior_fork (parent_pid
, child_pid
, 0, 1);
630 /* Did we follow the child? Had it exec'd before we saw the parent vfork? */
631 if (pending_follow
.fork_event
.saw_child_exec
632 && (PIDGET (inferior_ptid
) == child_pid
))
634 pending_follow
.fork_event
.saw_child_exec
= 0;
635 pending_follow
.kind
= TARGET_WAITKIND_SPURIOUS
;
636 follow_exec (PIDGET (inferior_ptid
), pending_follow
.execd_pathname
);
637 xfree (pending_follow
.execd_pathname
);
641 /* EXECD_PATHNAME is assumed to be non-NULL. */
644 follow_exec (int pid
, char *execd_pathname
)
647 struct target_ops
*tgt
;
649 if (!may_follow_exec
)
652 /* Did this exec() follow a vfork()? If so, we must follow the
653 vfork now too. Do it before following the exec. */
654 if (follow_vfork_when_exec
&&
655 (pending_follow
.kind
== TARGET_WAITKIND_VFORKED
))
657 pending_follow
.kind
= TARGET_WAITKIND_SPURIOUS
;
658 follow_vfork (PIDGET (inferior_ptid
),
659 pending_follow
.fork_event
.child_pid
);
660 follow_vfork_when_exec
= 0;
661 saved_pid
= PIDGET (inferior_ptid
);
663 /* Did we follow the parent? If so, we're done. If we followed
664 the child then we must also follow its exec(). */
665 if (PIDGET (inferior_ptid
) == pending_follow
.fork_event
.parent_pid
)
669 /* This is an exec event that we actually wish to pay attention to.
670 Refresh our symbol table to the newly exec'd program, remove any
673 If there are breakpoints, they aren't really inserted now,
674 since the exec() transformed our inferior into a fresh set
677 We want to preserve symbolic breakpoints on the list, since
678 we have hopes that they can be reset after the new a.out's
679 symbol table is read.
681 However, any "raw" breakpoints must be removed from the list
682 (e.g., the solib bp's), since their address is probably invalid
685 And, we DON'T want to call delete_breakpoints() here, since
686 that may write the bp's "shadow contents" (the instruction
687 value that was overwritten witha TRAP instruction). Since
688 we now have a new a.out, those shadow contents aren't valid. */
689 update_breakpoints_after_exec ();
691 /* If there was one, it's gone now. We cannot truly step-to-next
692 statement through an exec(). */
693 step_resume_breakpoint
= NULL
;
694 step_range_start
= 0;
697 /* If there was one, it's gone now. */
698 through_sigtramp_breakpoint
= NULL
;
700 /* What is this a.out's name? */
701 printf_unfiltered ("Executing new program: %s\n", execd_pathname
);
703 /* We've followed the inferior through an exec. Therefore, the
704 inferior has essentially been killed & reborn. */
706 /* First collect the run target in effect. */
707 tgt
= find_run_target ();
708 /* If we can't find one, things are in a very strange state... */
710 error ("Could find run target to save before following exec");
712 gdb_flush (gdb_stdout
);
713 target_mourn_inferior ();
714 inferior_ptid
= pid_to_ptid (saved_pid
);
715 /* Because mourn_inferior resets inferior_ptid. */
718 /* That a.out is now the one to use. */
719 exec_file_attach (execd_pathname
, 0);
721 /* And also is where symbols can be found. */
722 symbol_file_add_main (execd_pathname
, 0);
724 /* Reset the shared library package. This ensures that we get
725 a shlib event when the child reaches "_start", at which point
726 the dld will have had a chance to initialize the child. */
727 #if defined(SOLIB_RESTART)
730 #ifdef SOLIB_CREATE_INFERIOR_HOOK
731 SOLIB_CREATE_INFERIOR_HOOK (PIDGET (inferior_ptid
));
734 /* Reinsert all breakpoints. (Those which were symbolic have
735 been reset to the proper address in the new a.out, thanks
736 to symbol_file_command...) */
737 insert_breakpoints ();
739 /* The next resume of this inferior should bring it to the shlib
740 startup breakpoints. (If the user had also set bp's on
741 "main" from the old (parent) process, then they'll auto-
742 matically get reset there in the new process.) */
745 /* Non-zero if we just simulating a single-step. This is needed
746 because we cannot remove the breakpoints in the inferior process
747 until after the `wait' in `wait_for_inferior'. */
748 static int singlestep_breakpoints_inserted_p
= 0;
751 /* Things to clean up if we QUIT out of resume (). */
754 resume_cleanups (void *ignore
)
759 static const char schedlock_off
[] = "off";
760 static const char schedlock_on
[] = "on";
761 static const char schedlock_step
[] = "step";
762 static const char *scheduler_mode
= schedlock_off
;
763 static const char *scheduler_enums
[] =
772 set_schedlock_func (char *args
, int from_tty
, struct cmd_list_element
*c
)
774 if (c
->type
== set_cmd
)
775 if (!target_can_lock_scheduler
)
777 scheduler_mode
= schedlock_off
;
778 error ("Target '%s' cannot support this command.",
784 /* Resume the inferior, but allow a QUIT. This is useful if the user
785 wants to interrupt some lengthy single-stepping operation
786 (for child processes, the SIGINT goes to the inferior, and so
787 we get a SIGINT random_signal, but for remote debugging and perhaps
788 other targets, that's not true).
790 STEP nonzero if we should step (zero to continue instead).
791 SIG is the signal to give the inferior (zero for none). */
793 resume (int step
, enum target_signal sig
)
795 int should_resume
= 1;
796 struct cleanup
*old_cleanups
= make_cleanup (resume_cleanups
, 0);
799 /* FIXME: calling breakpoint_here_p (read_pc ()) three times! */
802 /* Some targets (e.g. Solaris x86) have a kernel bug when stepping
803 over an instruction that causes a page fault without triggering
804 a hardware watchpoint. The kernel properly notices that it shouldn't
805 stop, because the hardware watchpoint is not triggered, but it forgets
806 the step request and continues the program normally.
807 Work around the problem by removing hardware watchpoints if a step is
808 requested, GDB will check for a hardware watchpoint trigger after the
810 if (CANNOT_STEP_HW_WATCHPOINTS
&& step
&& breakpoints_inserted
)
811 remove_hw_watchpoints ();
814 /* Normally, by the time we reach `resume', the breakpoints are either
815 removed or inserted, as appropriate. The exception is if we're sitting
816 at a permanent breakpoint; we need to step over it, but permanent
817 breakpoints can't be removed. So we have to test for it here. */
818 if (breakpoint_here_p (read_pc ()) == permanent_breakpoint_here
)
819 SKIP_PERMANENT_BREAKPOINT ();
821 if (SOFTWARE_SINGLE_STEP_P () && step
)
823 /* Do it the hard way, w/temp breakpoints */
824 SOFTWARE_SINGLE_STEP (sig
, 1 /*insert-breakpoints */ );
825 /* ...and don't ask hardware to do it. */
827 /* and do not pull these breakpoints until after a `wait' in
828 `wait_for_inferior' */
829 singlestep_breakpoints_inserted_p
= 1;
832 /* Handle any optimized stores to the inferior NOW... */
833 #ifdef DO_DEFERRED_STORES
837 /* If there were any forks/vforks/execs that were caught and are
838 now to be followed, then do so. */
839 switch (pending_follow
.kind
)
841 case (TARGET_WAITKIND_FORKED
):
842 pending_follow
.kind
= TARGET_WAITKIND_SPURIOUS
;
843 follow_fork (PIDGET (inferior_ptid
),
844 pending_follow
.fork_event
.child_pid
);
847 case (TARGET_WAITKIND_VFORKED
):
849 int saw_child_exec
= pending_follow
.fork_event
.saw_child_exec
;
851 pending_follow
.kind
= TARGET_WAITKIND_SPURIOUS
;
852 follow_vfork (PIDGET (inferior_ptid
),
853 pending_follow
.fork_event
.child_pid
);
855 /* Did we follow the child, but not yet see the child's exec event?
856 If so, then it actually ought to be waiting for us; we respond to
857 parent vfork events. We don't actually want to resume the child
858 in this situation; we want to just get its exec event. */
859 if (!saw_child_exec
&&
860 (PIDGET (inferior_ptid
) == pending_follow
.fork_event
.child_pid
))
865 case (TARGET_WAITKIND_EXECD
):
866 /* If we saw a vfork event but couldn't follow it until we saw
867 an exec, then now might be the time! */
868 pending_follow
.kind
= TARGET_WAITKIND_SPURIOUS
;
869 /* follow_exec is called as soon as the exec event is seen. */
876 /* Install inferior's terminal modes. */
877 target_terminal_inferior ();
883 resume_ptid
= RESUME_ALL
; /* Default */
885 if ((step
|| singlestep_breakpoints_inserted_p
) &&
886 !breakpoints_inserted
&& breakpoint_here_p (read_pc ()))
888 /* Stepping past a breakpoint without inserting breakpoints.
889 Make sure only the current thread gets to step, so that
890 other threads don't sneak past breakpoints while they are
893 resume_ptid
= inferior_ptid
;
896 if ((scheduler_mode
== schedlock_on
) ||
897 (scheduler_mode
== schedlock_step
&&
898 (step
|| singlestep_breakpoints_inserted_p
)))
900 /* User-settable 'scheduler' mode requires solo thread resume. */
901 resume_ptid
= inferior_ptid
;
904 #ifdef CANNOT_STEP_BREAKPOINT
905 /* Most targets can step a breakpoint instruction, thus executing it
906 normally. But if this one cannot, just continue and we will hit
908 if (step
&& breakpoints_inserted
&& breakpoint_here_p (read_pc ()))
911 target_resume (resume_ptid
, step
, sig
);
914 discard_cleanups (old_cleanups
);
918 /* Clear out all variables saying what to do when inferior is continued.
919 First do this, then set the ones you want, then call `proceed'. */
922 clear_proceed_status (void)
925 step_range_start
= 0;
927 step_frame_address
= 0;
928 step_over_calls
= STEP_OVER_UNDEBUGGABLE
;
930 stop_soon_quietly
= 0;
931 proceed_to_finish
= 0;
932 breakpoint_proceeded
= 1; /* We're about to proceed... */
934 /* Discard any remaining commands or status from previous stop. */
935 bpstat_clear (&stop_bpstat
);
938 /* Basic routine for continuing the program in various fashions.
940 ADDR is the address to resume at, or -1 for resume where stopped.
941 SIGGNAL is the signal to give it, or 0 for none,
942 or -1 for act according to how it stopped.
943 STEP is nonzero if should trap after one instruction.
944 -1 means return after that and print nothing.
945 You should probably set various step_... variables
946 before calling here, if you are stepping.
948 You should call clear_proceed_status before calling proceed. */
951 proceed (CORE_ADDR addr
, enum target_signal siggnal
, int step
)
956 step_start_function
= find_pc_function (read_pc ());
960 if (addr
== (CORE_ADDR
) -1)
962 /* If there is a breakpoint at the address we will resume at,
963 step one instruction before inserting breakpoints
964 so that we do not stop right away (and report a second
965 hit at this breakpoint). */
967 if (read_pc () == stop_pc
&& breakpoint_here_p (read_pc ()))
970 #ifndef STEP_SKIPS_DELAY
971 #define STEP_SKIPS_DELAY(pc) (0)
972 #define STEP_SKIPS_DELAY_P (0)
974 /* Check breakpoint_here_p first, because breakpoint_here_p is fast
975 (it just checks internal GDB data structures) and STEP_SKIPS_DELAY
976 is slow (it needs to read memory from the target). */
977 if (STEP_SKIPS_DELAY_P
978 && breakpoint_here_p (read_pc () + 4)
979 && STEP_SKIPS_DELAY (read_pc ()))
987 #ifdef PREPARE_TO_PROCEED
988 /* In a multi-threaded task we may select another thread
989 and then continue or step.
991 But if the old thread was stopped at a breakpoint, it
992 will immediately cause another breakpoint stop without
993 any execution (i.e. it will report a breakpoint hit
994 incorrectly). So we must step over it first.
996 PREPARE_TO_PROCEED checks the current thread against the thread
997 that reported the most recent event. If a step-over is required
998 it returns TRUE and sets the current thread to the old thread. */
999 if (PREPARE_TO_PROCEED (1) && breakpoint_here_p (read_pc ()))
1004 #endif /* PREPARE_TO_PROCEED */
1007 if (trap_expected_after_continue
)
1009 /* If (step == 0), a trap will be automatically generated after
1010 the first instruction is executed. Force step one
1011 instruction to clear this condition. This should not occur
1012 if step is nonzero, but it is harmless in that case. */
1014 trap_expected_after_continue
= 0;
1016 #endif /* HP_OS_BUG */
1019 /* We will get a trace trap after one instruction.
1020 Continue it automatically and insert breakpoints then. */
1024 int temp
= insert_breakpoints ();
1027 print_sys_errmsg ("insert_breakpoints", temp
);
1028 error ("Cannot insert breakpoints.\n\
1029 The same program may be running in another process,\n\
1030 or you may have requested too many hardware\n\
1031 breakpoints and/or watchpoints.\n");
1034 breakpoints_inserted
= 1;
1037 if (siggnal
!= TARGET_SIGNAL_DEFAULT
)
1038 stop_signal
= siggnal
;
1039 /* If this signal should not be seen by program,
1040 give it zero. Used for debugging signals. */
1041 else if (!signal_program
[stop_signal
])
1042 stop_signal
= TARGET_SIGNAL_0
;
1044 annotate_starting ();
1046 /* Make sure that output from GDB appears before output from the
1048 gdb_flush (gdb_stdout
);
1050 /* Resume inferior. */
1051 resume (oneproc
|| step
|| bpstat_should_step (), stop_signal
);
1053 /* Wait for it to stop (if not standalone)
1054 and in any case decode why it stopped, and act accordingly. */
1055 /* Do this only if we are not using the event loop, or if the target
1056 does not support asynchronous execution. */
1057 if (!event_loop_p
|| !target_can_async_p ())
1059 wait_for_inferior ();
1064 /* Record the pc and sp of the program the last time it stopped.
1065 These are just used internally by wait_for_inferior, but need
1066 to be preserved over calls to it and cleared when the inferior
1068 static CORE_ADDR prev_pc
;
1069 static CORE_ADDR prev_func_start
;
1070 static char *prev_func_name
;
1073 /* Start remote-debugging of a machine over a serial link. */
1078 init_thread_list ();
1079 init_wait_for_inferior ();
1080 stop_soon_quietly
= 1;
1083 /* Always go on waiting for the target, regardless of the mode. */
1084 /* FIXME: cagney/1999-09-23: At present it isn't possible to
1085 indicate to wait_for_inferior that a target should timeout if
1086 nothing is returned (instead of just blocking). Because of this,
1087 targets expecting an immediate response need to, internally, set
1088 things up so that the target_wait() is forced to eventually
1090 /* FIXME: cagney/1999-09-24: It isn't possible for target_open() to
1091 differentiate to its caller what the state of the target is after
1092 the initial open has been performed. Here we're assuming that
1093 the target has stopped. It should be possible to eventually have
1094 target_open() return to the caller an indication that the target
1095 is currently running and GDB state should be set to the same as
1096 for an async run. */
1097 wait_for_inferior ();
1101 /* Initialize static vars when a new inferior begins. */
1104 init_wait_for_inferior (void)
1106 /* These are meaningless until the first time through wait_for_inferior. */
1108 prev_func_start
= 0;
1109 prev_func_name
= NULL
;
1112 trap_expected_after_continue
= 0;
1114 breakpoints_inserted
= 0;
1115 breakpoint_init_inferior (inf_starting
);
1117 /* Don't confuse first call to proceed(). */
1118 stop_signal
= TARGET_SIGNAL_0
;
1120 /* The first resume is not following a fork/vfork/exec. */
1121 pending_follow
.kind
= TARGET_WAITKIND_SPURIOUS
; /* I.e., none. */
1122 pending_follow
.fork_event
.saw_parent_fork
= 0;
1123 pending_follow
.fork_event
.saw_child_fork
= 0;
1124 pending_follow
.fork_event
.saw_child_exec
= 0;
1126 /* See wait_for_inferior's handling of SYSCALL_ENTRY/RETURN events. */
1127 number_of_threads_in_syscalls
= 0;
1129 clear_proceed_status ();
1133 delete_breakpoint_current_contents (void *arg
)
1135 struct breakpoint
**breakpointp
= (struct breakpoint
**) arg
;
1136 if (*breakpointp
!= NULL
)
1138 delete_breakpoint (*breakpointp
);
1139 *breakpointp
= NULL
;
1143 /* This enum encodes possible reasons for doing a target_wait, so that
1144 wfi can call target_wait in one place. (Ultimately the call will be
1145 moved out of the infinite loop entirely.) */
1149 infwait_normal_state
,
1150 infwait_thread_hop_state
,
1151 infwait_nullified_state
,
1152 infwait_nonstep_watch_state
1155 /* Why did the inferior stop? Used to print the appropriate messages
1156 to the interface from within handle_inferior_event(). */
1157 enum inferior_stop_reason
1159 /* We don't know why. */
1161 /* Step, next, nexti, stepi finished. */
1163 /* Found breakpoint. */
1165 /* Inferior terminated by signal. */
1167 /* Inferior exited. */
1169 /* Inferior received signal, and user asked to be notified. */
1173 /* This structure contains what used to be local variables in
1174 wait_for_inferior. Probably many of them can return to being
1175 locals in handle_inferior_event. */
1177 struct execution_control_state
1179 struct target_waitstatus ws
;
1180 struct target_waitstatus
*wp
;
1183 CORE_ADDR stop_func_start
;
1184 CORE_ADDR stop_func_end
;
1185 char *stop_func_name
;
1186 struct symtab_and_line sal
;
1187 int remove_breakpoints_on_following_step
;
1189 struct symtab
*current_symtab
;
1190 int handling_longjmp
; /* FIXME */
1192 ptid_t saved_inferior_ptid
;
1194 int stepping_through_solib_after_catch
;
1195 bpstat stepping_through_solib_catchpoints
;
1196 int enable_hw_watchpoints_after_wait
;
1197 int stepping_through_sigtramp
;
1198 int new_thread_event
;
1199 struct target_waitstatus tmpstatus
;
1200 enum infwait_states infwait_state
;
1205 void init_execution_control_state (struct execution_control_state
* ecs
);
1207 void handle_inferior_event (struct execution_control_state
* ecs
);
1209 static void check_sigtramp2 (struct execution_control_state
*ecs
);
1210 static void step_into_function (struct execution_control_state
*ecs
);
1211 static void step_over_function (struct execution_control_state
*ecs
);
1212 static void stop_stepping (struct execution_control_state
*ecs
);
1213 static void prepare_to_wait (struct execution_control_state
*ecs
);
1214 static void keep_going (struct execution_control_state
*ecs
);
1215 static void print_stop_reason (enum inferior_stop_reason stop_reason
, int stop_info
);
1217 /* Wait for control to return from inferior to debugger.
1218 If inferior gets a signal, we may decide to start it up again
1219 instead of returning. That is why there is a loop in this function.
1220 When this function actually returns it means the inferior
1221 should be left stopped and GDB should read more commands. */
1224 wait_for_inferior (void)
1226 struct cleanup
*old_cleanups
;
1227 struct execution_control_state ecss
;
1228 struct execution_control_state
*ecs
;
1230 old_cleanups
= make_cleanup (delete_step_resume_breakpoint
,
1231 &step_resume_breakpoint
);
1232 make_cleanup (delete_breakpoint_current_contents
,
1233 &through_sigtramp_breakpoint
);
1235 /* wfi still stays in a loop, so it's OK just to take the address of
1236 a local to get the ecs pointer. */
1239 /* Fill in with reasonable starting values. */
1240 init_execution_control_state (ecs
);
1242 /* We'll update this if & when we switch to a new thread. */
1243 previous_inferior_ptid
= inferior_ptid
;
1245 overlay_cache_invalid
= 1;
1247 /* We have to invalidate the registers BEFORE calling target_wait
1248 because they can be loaded from the target while in target_wait.
1249 This makes remote debugging a bit more efficient for those
1250 targets that provide critical registers as part of their normal
1251 status mechanism. */
1253 registers_changed ();
1257 if (target_wait_hook
)
1258 ecs
->ptid
= target_wait_hook (ecs
->waiton_ptid
, ecs
->wp
);
1260 ecs
->ptid
= target_wait (ecs
->waiton_ptid
, ecs
->wp
);
1262 /* Now figure out what to do with the result of the result. */
1263 handle_inferior_event (ecs
);
1265 if (!ecs
->wait_some_more
)
1268 do_cleanups (old_cleanups
);
1271 /* Asynchronous version of wait_for_inferior. It is called by the
1272 event loop whenever a change of state is detected on the file
1273 descriptor corresponding to the target. It can be called more than
1274 once to complete a single execution command. In such cases we need
1275 to keep the state in a global variable ASYNC_ECSS. If it is the
1276 last time that this function is called for a single execution
1277 command, then report to the user that the inferior has stopped, and
1278 do the necessary cleanups. */
1280 struct execution_control_state async_ecss
;
1281 struct execution_control_state
*async_ecs
;
1284 fetch_inferior_event (void *client_data
)
1286 static struct cleanup
*old_cleanups
;
1288 async_ecs
= &async_ecss
;
1290 if (!async_ecs
->wait_some_more
)
1292 old_cleanups
= make_exec_cleanup (delete_step_resume_breakpoint
,
1293 &step_resume_breakpoint
);
1294 make_exec_cleanup (delete_breakpoint_current_contents
,
1295 &through_sigtramp_breakpoint
);
1297 /* Fill in with reasonable starting values. */
1298 init_execution_control_state (async_ecs
);
1300 /* We'll update this if & when we switch to a new thread. */
1301 previous_inferior_ptid
= inferior_ptid
;
1303 overlay_cache_invalid
= 1;
1305 /* We have to invalidate the registers BEFORE calling target_wait
1306 because they can be loaded from the target while in target_wait.
1307 This makes remote debugging a bit more efficient for those
1308 targets that provide critical registers as part of their normal
1309 status mechanism. */
1311 registers_changed ();
1314 if (target_wait_hook
)
1315 async_ecs
->ptid
= target_wait_hook (async_ecs
->waiton_ptid
, async_ecs
->wp
);
1317 async_ecs
->ptid
= target_wait (async_ecs
->waiton_ptid
, async_ecs
->wp
);
1319 /* Now figure out what to do with the result of the result. */
1320 handle_inferior_event (async_ecs
);
1322 if (!async_ecs
->wait_some_more
)
1324 /* Do only the cleanups that have been added by this
1325 function. Let the continuations for the commands do the rest,
1326 if there are any. */
1327 do_exec_cleanups (old_cleanups
);
1329 if (step_multi
&& stop_step
)
1330 inferior_event_handler (INF_EXEC_CONTINUE
, NULL
);
1332 inferior_event_handler (INF_EXEC_COMPLETE
, NULL
);
1336 /* Prepare an execution control state for looping through a
1337 wait_for_inferior-type loop. */
1340 init_execution_control_state (struct execution_control_state
*ecs
)
1342 /* ecs->another_trap? */
1343 ecs
->random_signal
= 0;
1344 ecs
->remove_breakpoints_on_following_step
= 0;
1345 ecs
->handling_longjmp
= 0; /* FIXME */
1346 ecs
->update_step_sp
= 0;
1347 ecs
->stepping_through_solib_after_catch
= 0;
1348 ecs
->stepping_through_solib_catchpoints
= NULL
;
1349 ecs
->enable_hw_watchpoints_after_wait
= 0;
1350 ecs
->stepping_through_sigtramp
= 0;
1351 ecs
->sal
= find_pc_line (prev_pc
, 0);
1352 ecs
->current_line
= ecs
->sal
.line
;
1353 ecs
->current_symtab
= ecs
->sal
.symtab
;
1354 ecs
->infwait_state
= infwait_normal_state
;
1355 ecs
->waiton_ptid
= pid_to_ptid (-1);
1356 ecs
->wp
= &(ecs
->ws
);
1359 /* Call this function before setting step_resume_breakpoint, as a
1360 sanity check. There should never be more than one step-resume
1361 breakpoint per thread, so we should never be setting a new
1362 step_resume_breakpoint when one is already active. */
1364 check_for_old_step_resume_breakpoint (void)
1366 if (step_resume_breakpoint
)
1367 warning ("GDB bug: infrun.c (wait_for_inferior): dropping old step_resume breakpoint");
1370 /* Return the cached copy of the last pid/waitstatus returned by
1371 target_wait()/target_wait_hook(). The data is actually cached by
1372 handle_inferior_event(), which gets called immediately after
1373 target_wait()/target_wait_hook(). */
1376 get_last_target_status(ptid_t
*ptidp
, struct target_waitstatus
*status
)
1378 *ptidp
= target_last_wait_ptid
;
1379 *status
= target_last_waitstatus
;
1382 /* Switch thread contexts, maintaining "infrun state". */
1385 context_switch (struct execution_control_state
*ecs
)
1387 /* Caution: it may happen that the new thread (or the old one!)
1388 is not in the thread list. In this case we must not attempt
1389 to "switch context", or we run the risk that our context may
1390 be lost. This may happen as a result of the target module
1391 mishandling thread creation. */
1393 if (in_thread_list (inferior_ptid
) && in_thread_list (ecs
->ptid
))
1394 { /* Perform infrun state context switch: */
1395 /* Save infrun state for the old thread. */
1396 save_infrun_state (inferior_ptid
, prev_pc
,
1397 prev_func_start
, prev_func_name
,
1398 trap_expected
, step_resume_breakpoint
,
1399 through_sigtramp_breakpoint
, step_range_start
,
1400 step_range_end
, step_frame_address
,
1401 ecs
->handling_longjmp
, ecs
->another_trap
,
1402 ecs
->stepping_through_solib_after_catch
,
1403 ecs
->stepping_through_solib_catchpoints
,
1404 ecs
->stepping_through_sigtramp
,
1405 ecs
->current_line
, ecs
->current_symtab
,
1408 /* Load infrun state for the new thread. */
1409 load_infrun_state (ecs
->ptid
, &prev_pc
,
1410 &prev_func_start
, &prev_func_name
,
1411 &trap_expected
, &step_resume_breakpoint
,
1412 &through_sigtramp_breakpoint
, &step_range_start
,
1413 &step_range_end
, &step_frame_address
,
1414 &ecs
->handling_longjmp
, &ecs
->another_trap
,
1415 &ecs
->stepping_through_solib_after_catch
,
1416 &ecs
->stepping_through_solib_catchpoints
,
1417 &ecs
->stepping_through_sigtramp
,
1418 &ecs
->current_line
, &ecs
->current_symtab
,
1421 inferior_ptid
= ecs
->ptid
;
1425 /* Given an execution control state that has been freshly filled in
1426 by an event from the inferior, figure out what it means and take
1427 appropriate action. */
1430 handle_inferior_event (struct execution_control_state
*ecs
)
1433 int stepped_after_stopped_by_watchpoint
;
1435 /* Cache the last pid/waitstatus. */
1436 target_last_wait_ptid
= ecs
->ptid
;
1437 target_last_waitstatus
= *ecs
->wp
;
1439 /* Keep this extra brace for now, minimizes diffs. */
1441 switch (ecs
->infwait_state
)
1443 case infwait_thread_hop_state
:
1444 /* Cancel the waiton_ptid. */
1445 ecs
->waiton_ptid
= pid_to_ptid (-1);
1446 /* Fall thru to the normal_state case. */
1448 case infwait_normal_state
:
1449 /* See comments where a TARGET_WAITKIND_SYSCALL_RETURN event
1450 is serviced in this loop, below. */
1451 if (ecs
->enable_hw_watchpoints_after_wait
)
1453 TARGET_ENABLE_HW_WATCHPOINTS (PIDGET (inferior_ptid
));
1454 ecs
->enable_hw_watchpoints_after_wait
= 0;
1456 stepped_after_stopped_by_watchpoint
= 0;
1459 case infwait_nullified_state
:
1462 case infwait_nonstep_watch_state
:
1463 insert_breakpoints ();
1465 /* FIXME-maybe: is this cleaner than setting a flag? Does it
1466 handle things like signals arriving and other things happening
1467 in combination correctly? */
1468 stepped_after_stopped_by_watchpoint
= 1;
1471 ecs
->infwait_state
= infwait_normal_state
;
1473 flush_cached_frames ();
1475 /* If it's a new process, add it to the thread database */
1477 ecs
->new_thread_event
= (! ptid_equal (ecs
->ptid
, inferior_ptid
)
1478 && ! in_thread_list (ecs
->ptid
));
1480 if (ecs
->ws
.kind
!= TARGET_WAITKIND_EXITED
1481 && ecs
->ws
.kind
!= TARGET_WAITKIND_SIGNALLED
1482 && ecs
->new_thread_event
)
1484 add_thread (ecs
->ptid
);
1487 ui_out_text (uiout
, "[New ");
1488 ui_out_text (uiout
, target_pid_or_tid_to_str (ecs
->ptid
));
1489 ui_out_text (uiout
, "]\n");
1491 printf_filtered ("[New %s]\n", target_pid_or_tid_to_str (ecs
->ptid
));
1495 /* NOTE: This block is ONLY meant to be invoked in case of a
1496 "thread creation event"! If it is invoked for any other
1497 sort of event (such as a new thread landing on a breakpoint),
1498 the event will be discarded, which is almost certainly
1501 To avoid this, the low-level module (eg. target_wait)
1502 should call in_thread_list and add_thread, so that the
1503 new thread is known by the time we get here. */
1505 /* We may want to consider not doing a resume here in order
1506 to give the user a chance to play with the new thread.
1507 It might be good to make that a user-settable option. */
1509 /* At this point, all threads are stopped (happens
1510 automatically in either the OS or the native code).
1511 Therefore we need to continue all threads in order to
1514 target_resume (RESUME_ALL
, 0, TARGET_SIGNAL_0
);
1515 prepare_to_wait (ecs
);
1520 switch (ecs
->ws
.kind
)
1522 case TARGET_WAITKIND_LOADED
:
1523 /* Ignore gracefully during startup of the inferior, as it
1524 might be the shell which has just loaded some objects,
1525 otherwise add the symbols for the newly loaded objects. */
1527 if (!stop_soon_quietly
)
1529 /* Remove breakpoints, SOLIB_ADD might adjust
1530 breakpoint addresses via breakpoint_re_set. */
1531 if (breakpoints_inserted
)
1532 remove_breakpoints ();
1534 /* Check for any newly added shared libraries if we're
1535 supposed to be adding them automatically. */
1538 /* Switch terminal for any messages produced by
1539 breakpoint_re_set. */
1540 target_terminal_ours_for_output ();
1541 SOLIB_ADD (NULL
, 0, NULL
);
1542 target_terminal_inferior ();
1545 /* Reinsert breakpoints and continue. */
1546 if (breakpoints_inserted
)
1547 insert_breakpoints ();
1550 resume (0, TARGET_SIGNAL_0
);
1551 prepare_to_wait (ecs
);
1554 case TARGET_WAITKIND_SPURIOUS
:
1555 resume (0, TARGET_SIGNAL_0
);
1556 prepare_to_wait (ecs
);
1559 case TARGET_WAITKIND_EXITED
:
1560 target_terminal_ours (); /* Must do this before mourn anyway */
1561 print_stop_reason (EXITED
, ecs
->ws
.value
.integer
);
1563 /* Record the exit code in the convenience variable $_exitcode, so
1564 that the user can inspect this again later. */
1565 set_internalvar (lookup_internalvar ("_exitcode"),
1566 value_from_longest (builtin_type_int
,
1567 (LONGEST
) ecs
->ws
.value
.integer
));
1568 gdb_flush (gdb_stdout
);
1569 target_mourn_inferior ();
1570 singlestep_breakpoints_inserted_p
= 0; /*SOFTWARE_SINGLE_STEP_P() */
1571 stop_print_frame
= 0;
1572 stop_stepping (ecs
);
1575 case TARGET_WAITKIND_SIGNALLED
:
1576 stop_print_frame
= 0;
1577 stop_signal
= ecs
->ws
.value
.sig
;
1578 target_terminal_ours (); /* Must do this before mourn anyway */
1580 /* Note: By definition of TARGET_WAITKIND_SIGNALLED, we shouldn't
1581 reach here unless the inferior is dead. However, for years
1582 target_kill() was called here, which hints that fatal signals aren't
1583 really fatal on some systems. If that's true, then some changes
1585 target_mourn_inferior ();
1587 print_stop_reason (SIGNAL_EXITED
, stop_signal
);
1588 singlestep_breakpoints_inserted_p
= 0; /*SOFTWARE_SINGLE_STEP_P() */
1589 stop_stepping (ecs
);
1592 /* The following are the only cases in which we keep going;
1593 the above cases end in a continue or goto. */
1594 case TARGET_WAITKIND_FORKED
:
1595 stop_signal
= TARGET_SIGNAL_TRAP
;
1596 pending_follow
.kind
= ecs
->ws
.kind
;
1598 /* Ignore fork events reported for the parent; we're only
1599 interested in reacting to forks of the child. Note that
1600 we expect the child's fork event to be available if we
1601 waited for it now. */
1602 if (ptid_equal (inferior_ptid
, ecs
->ptid
))
1604 pending_follow
.fork_event
.saw_parent_fork
= 1;
1605 pending_follow
.fork_event
.parent_pid
= PIDGET (ecs
->ptid
);
1606 pending_follow
.fork_event
.child_pid
= ecs
->ws
.value
.related_pid
;
1607 prepare_to_wait (ecs
);
1612 pending_follow
.fork_event
.saw_child_fork
= 1;
1613 pending_follow
.fork_event
.child_pid
= PIDGET (ecs
->ptid
);
1614 pending_follow
.fork_event
.parent_pid
= ecs
->ws
.value
.related_pid
;
1617 stop_pc
= read_pc_pid (ecs
->ptid
);
1618 ecs
->saved_inferior_ptid
= inferior_ptid
;
1619 inferior_ptid
= ecs
->ptid
;
1620 stop_bpstat
= bpstat_stop_status (&stop_pc
, currently_stepping (ecs
));
1621 ecs
->random_signal
= !bpstat_explains_signal (stop_bpstat
);
1622 inferior_ptid
= ecs
->saved_inferior_ptid
;
1623 goto process_event_stop_test
;
1625 /* If this a platform which doesn't allow a debugger to touch a
1626 vfork'd inferior until after it exec's, then we'd best keep
1627 our fingers entirely off the inferior, other than continuing
1628 it. This has the unfortunate side-effect that catchpoints
1629 of vforks will be ignored. But since the platform doesn't
1630 allow the inferior be touched at vfork time, there's really
1632 case TARGET_WAITKIND_VFORKED
:
1633 stop_signal
= TARGET_SIGNAL_TRAP
;
1634 pending_follow
.kind
= ecs
->ws
.kind
;
1636 /* Is this a vfork of the parent? If so, then give any
1637 vfork catchpoints a chance to trigger now. (It's
1638 dangerous to do so if the child canot be touched until
1639 it execs, and the child has not yet exec'd. We probably
1640 should warn the user to that effect when the catchpoint
1642 if (ptid_equal (ecs
->ptid
, inferior_ptid
))
1644 pending_follow
.fork_event
.saw_parent_fork
= 1;
1645 pending_follow
.fork_event
.parent_pid
= PIDGET (ecs
->ptid
);
1646 pending_follow
.fork_event
.child_pid
= ecs
->ws
.value
.related_pid
;
1649 /* If we've seen the child's vfork event but cannot really touch
1650 the child until it execs, then we must continue the child now.
1651 Else, give any vfork catchpoints a chance to trigger now. */
1654 pending_follow
.fork_event
.saw_child_fork
= 1;
1655 pending_follow
.fork_event
.child_pid
= PIDGET (ecs
->ptid
);
1656 pending_follow
.fork_event
.parent_pid
= ecs
->ws
.value
.related_pid
;
1657 target_post_startup_inferior (
1658 pid_to_ptid (pending_follow
.fork_event
.child_pid
));
1659 follow_vfork_when_exec
= !target_can_follow_vfork_prior_to_exec ();
1660 if (follow_vfork_when_exec
)
1662 target_resume (ecs
->ptid
, 0, TARGET_SIGNAL_0
);
1663 prepare_to_wait (ecs
);
1668 stop_pc
= read_pc ();
1669 stop_bpstat
= bpstat_stop_status (&stop_pc
, currently_stepping (ecs
));
1670 ecs
->random_signal
= !bpstat_explains_signal (stop_bpstat
);
1671 goto process_event_stop_test
;
1673 case TARGET_WAITKIND_EXECD
:
1674 stop_signal
= TARGET_SIGNAL_TRAP
;
1676 /* Is this a target which reports multiple exec events per actual
1677 call to exec()? (HP-UX using ptrace does, for example.) If so,
1678 ignore all but the last one. Just resume the exec'r, and wait
1679 for the next exec event. */
1680 if (inferior_ignoring_leading_exec_events
)
1682 inferior_ignoring_leading_exec_events
--;
1683 if (pending_follow
.kind
== TARGET_WAITKIND_VFORKED
)
1684 ENSURE_VFORKING_PARENT_REMAINS_STOPPED (pending_follow
.fork_event
.parent_pid
);
1685 target_resume (ecs
->ptid
, 0, TARGET_SIGNAL_0
);
1686 prepare_to_wait (ecs
);
1689 inferior_ignoring_leading_exec_events
=
1690 target_reported_exec_events_per_exec_call () - 1;
1692 pending_follow
.execd_pathname
=
1693 savestring (ecs
->ws
.value
.execd_pathname
,
1694 strlen (ecs
->ws
.value
.execd_pathname
));
1696 /* Did inferior_ptid exec, or did a (possibly not-yet-followed)
1697 child of a vfork exec?
1699 ??rehrauer: This is unabashedly an HP-UX specific thing. On
1700 HP-UX, events associated with a vforking inferior come in
1701 threes: a vfork event for the child (always first), followed
1702 a vfork event for the parent and an exec event for the child.
1703 The latter two can come in either order.
1705 If we get the parent vfork event first, life's good: We follow
1706 either the parent or child, and then the child's exec event is
1709 But if we get the child's exec event first, then we delay
1710 responding to it until we handle the parent's vfork. Because,
1711 otherwise we can't satisfy a "catch vfork". */
1712 if (pending_follow
.kind
== TARGET_WAITKIND_VFORKED
)
1714 pending_follow
.fork_event
.saw_child_exec
= 1;
1716 /* On some targets, the child must be resumed before
1717 the parent vfork event is delivered. A single-step
1719 if (RESUME_EXECD_VFORKING_CHILD_TO_GET_PARENT_VFORK ())
1720 target_resume (ecs
->ptid
, 1, TARGET_SIGNAL_0
);
1721 /* We expect the parent vfork event to be available now. */
1722 prepare_to_wait (ecs
);
1726 /* This causes the eventpoints and symbol table to be reset. Must
1727 do this now, before trying to determine whether to stop. */
1728 follow_exec (PIDGET (inferior_ptid
), pending_follow
.execd_pathname
);
1729 xfree (pending_follow
.execd_pathname
);
1731 stop_pc
= read_pc_pid (ecs
->ptid
);
1732 ecs
->saved_inferior_ptid
= inferior_ptid
;
1733 inferior_ptid
= ecs
->ptid
;
1734 stop_bpstat
= bpstat_stop_status (&stop_pc
, currently_stepping (ecs
));
1735 ecs
->random_signal
= !bpstat_explains_signal (stop_bpstat
);
1736 inferior_ptid
= ecs
->saved_inferior_ptid
;
1737 goto process_event_stop_test
;
1739 /* These syscall events are returned on HP-UX, as part of its
1740 implementation of page-protection-based "hardware" watchpoints.
1741 HP-UX has unfortunate interactions between page-protections and
1742 some system calls. Our solution is to disable hardware watches
1743 when a system call is entered, and reenable them when the syscall
1744 completes. The downside of this is that we may miss the precise
1745 point at which a watched piece of memory is modified. "Oh well."
1747 Note that we may have multiple threads running, which may each
1748 enter syscalls at roughly the same time. Since we don't have a
1749 good notion currently of whether a watched piece of memory is
1750 thread-private, we'd best not have any page-protections active
1751 when any thread is in a syscall. Thus, we only want to reenable
1752 hardware watches when no threads are in a syscall.
1754 Also, be careful not to try to gather much state about a thread
1755 that's in a syscall. It's frequently a losing proposition. */
1756 case TARGET_WAITKIND_SYSCALL_ENTRY
:
1757 number_of_threads_in_syscalls
++;
1758 if (number_of_threads_in_syscalls
== 1)
1760 TARGET_DISABLE_HW_WATCHPOINTS (PIDGET (inferior_ptid
));
1762 resume (0, TARGET_SIGNAL_0
);
1763 prepare_to_wait (ecs
);
1766 /* Before examining the threads further, step this thread to
1767 get it entirely out of the syscall. (We get notice of the
1768 event when the thread is just on the verge of exiting a
1769 syscall. Stepping one instruction seems to get it back
1772 Note that although the logical place to reenable h/w watches
1773 is here, we cannot. We cannot reenable them before stepping
1774 the thread (this causes the next wait on the thread to hang).
1776 Nor can we enable them after stepping until we've done a wait.
1777 Thus, we simply set the flag ecs->enable_hw_watchpoints_after_wait
1778 here, which will be serviced immediately after the target
1780 case TARGET_WAITKIND_SYSCALL_RETURN
:
1781 target_resume (ecs
->ptid
, 1, TARGET_SIGNAL_0
);
1783 if (number_of_threads_in_syscalls
> 0)
1785 number_of_threads_in_syscalls
--;
1786 ecs
->enable_hw_watchpoints_after_wait
=
1787 (number_of_threads_in_syscalls
== 0);
1789 prepare_to_wait (ecs
);
1792 case TARGET_WAITKIND_STOPPED
:
1793 stop_signal
= ecs
->ws
.value
.sig
;
1796 /* We had an event in the inferior, but we are not interested
1797 in handling it at this level. The lower layers have already
1798 done what needs to be done, if anything. This case can
1799 occur only when the target is async or extended-async. One
1800 of the circumstamces for this to happen is when the
1801 inferior produces output for the console. The inferior has
1802 not stopped, and we are ignoring the event. */
1803 case TARGET_WAITKIND_IGNORE
:
1804 ecs
->wait_some_more
= 1;
1808 /* We may want to consider not doing a resume here in order to give
1809 the user a chance to play with the new thread. It might be good
1810 to make that a user-settable option. */
1812 /* At this point, all threads are stopped (happens automatically in
1813 either the OS or the native code). Therefore we need to continue
1814 all threads in order to make progress. */
1815 if (ecs
->new_thread_event
)
1817 target_resume (RESUME_ALL
, 0, TARGET_SIGNAL_0
);
1818 prepare_to_wait (ecs
);
1822 stop_pc
= read_pc_pid (ecs
->ptid
);
1824 /* See if a thread hit a thread-specific breakpoint that was meant for
1825 another thread. If so, then step that thread past the breakpoint,
1828 if (stop_signal
== TARGET_SIGNAL_TRAP
)
1830 if (SOFTWARE_SINGLE_STEP_P () && singlestep_breakpoints_inserted_p
)
1831 ecs
->random_signal
= 0;
1832 else if (breakpoints_inserted
1833 && breakpoint_here_p (stop_pc
- DECR_PC_AFTER_BREAK
))
1835 ecs
->random_signal
= 0;
1836 if (!breakpoint_thread_match (stop_pc
- DECR_PC_AFTER_BREAK
,
1841 /* Saw a breakpoint, but it was hit by the wrong thread.
1843 write_pc_pid (stop_pc
- DECR_PC_AFTER_BREAK
, ecs
->ptid
);
1845 remove_status
= remove_breakpoints ();
1846 /* Did we fail to remove breakpoints? If so, try
1847 to set the PC past the bp. (There's at least
1848 one situation in which we can fail to remove
1849 the bp's: On HP-UX's that use ttrace, we can't
1850 change the address space of a vforking child
1851 process until the child exits (well, okay, not
1852 then either :-) or execs. */
1853 if (remove_status
!= 0)
1855 write_pc_pid (stop_pc
- DECR_PC_AFTER_BREAK
+ 4, ecs
->ptid
);
1856 /* We need to restart all the threads now,
1857 * unles we're running in scheduler-locked mode.
1858 * Use currently_stepping to determine whether to
1861 /* FIXME MVS: is there any reason not to call resume()? */
1862 if (scheduler_mode
== schedlock_on
)
1863 target_resume (ecs
->ptid
,
1864 currently_stepping (ecs
),
1867 target_resume (RESUME_ALL
,
1868 currently_stepping (ecs
),
1870 prepare_to_wait (ecs
);
1875 breakpoints_inserted
= 0;
1876 if (!ptid_equal (inferior_ptid
, ecs
->ptid
))
1877 context_switch (ecs
);
1878 ecs
->waiton_ptid
= ecs
->ptid
;
1879 ecs
->wp
= &(ecs
->ws
);
1880 ecs
->another_trap
= 1;
1882 ecs
->infwait_state
= infwait_thread_hop_state
;
1884 registers_changed ();
1891 ecs
->random_signal
= 1;
1893 /* See if something interesting happened to the non-current thread. If
1894 so, then switch to that thread, and eventually give control back to
1897 Note that if there's any kind of pending follow (i.e., of a fork,
1898 vfork or exec), we don't want to do this now. Rather, we'll let
1899 the next resume handle it. */
1900 if (! ptid_equal (ecs
->ptid
, inferior_ptid
) &&
1901 (pending_follow
.kind
== TARGET_WAITKIND_SPURIOUS
))
1905 /* If it's a random signal for a non-current thread, notify user
1906 if he's expressed an interest. */
1907 if (ecs
->random_signal
1908 && signal_print
[stop_signal
])
1910 /* ??rehrauer: I don't understand the rationale for this code. If the
1911 inferior will stop as a result of this signal, then the act of handling
1912 the stop ought to print a message that's couches the stoppage in user
1913 terms, e.g., "Stopped for breakpoint/watchpoint". If the inferior
1914 won't stop as a result of the signal -- i.e., if the signal is merely
1915 a side-effect of something GDB's doing "under the covers" for the
1916 user, such as stepping threads over a breakpoint they shouldn't stop
1917 for -- then the message seems to be a serious annoyance at best.
1919 For now, remove the message altogether. */
1922 target_terminal_ours_for_output ();
1923 printf_filtered ("\nProgram received signal %s, %s.\n",
1924 target_signal_to_name (stop_signal
),
1925 target_signal_to_string (stop_signal
));
1926 gdb_flush (gdb_stdout
);
1930 /* If it's not SIGTRAP and not a signal we want to stop for, then
1931 continue the thread. */
1933 if (stop_signal
!= TARGET_SIGNAL_TRAP
1934 && !signal_stop
[stop_signal
])
1937 target_terminal_inferior ();
1939 /* Clear the signal if it should not be passed. */
1940 if (signal_program
[stop_signal
] == 0)
1941 stop_signal
= TARGET_SIGNAL_0
;
1943 target_resume (ecs
->ptid
, 0, stop_signal
);
1944 prepare_to_wait (ecs
);
1948 /* It's a SIGTRAP or a signal we're interested in. Switch threads,
1949 and fall into the rest of wait_for_inferior(). */
1951 context_switch (ecs
);
1954 context_hook (pid_to_thread_id (ecs
->ptid
));
1956 flush_cached_frames ();
1959 if (SOFTWARE_SINGLE_STEP_P () && singlestep_breakpoints_inserted_p
)
1961 /* Pull the single step breakpoints out of the target. */
1962 SOFTWARE_SINGLE_STEP (0, 0);
1963 singlestep_breakpoints_inserted_p
= 0;
1966 /* If PC is pointing at a nullified instruction, then step beyond
1967 it so that the user won't be confused when GDB appears to be ready
1970 /* if (INSTRUCTION_NULLIFIED && currently_stepping (ecs)) */
1971 if (INSTRUCTION_NULLIFIED
)
1973 registers_changed ();
1974 target_resume (ecs
->ptid
, 1, TARGET_SIGNAL_0
);
1976 /* We may have received a signal that we want to pass to
1977 the inferior; therefore, we must not clobber the waitstatus
1980 ecs
->infwait_state
= infwait_nullified_state
;
1981 ecs
->waiton_ptid
= ecs
->ptid
;
1982 ecs
->wp
= &(ecs
->tmpstatus
);
1983 prepare_to_wait (ecs
);
1987 /* It may not be necessary to disable the watchpoint to stop over
1988 it. For example, the PA can (with some kernel cooperation)
1989 single step over a watchpoint without disabling the watchpoint. */
1990 if (HAVE_STEPPABLE_WATCHPOINT
&& STOPPED_BY_WATCHPOINT (ecs
->ws
))
1993 prepare_to_wait (ecs
);
1997 /* It is far more common to need to disable a watchpoint to step
1998 the inferior over it. FIXME. What else might a debug
1999 register or page protection watchpoint scheme need here? */
2000 if (HAVE_NONSTEPPABLE_WATCHPOINT
&& STOPPED_BY_WATCHPOINT (ecs
->ws
))
2002 /* At this point, we are stopped at an instruction which has
2003 attempted to write to a piece of memory under control of
2004 a watchpoint. The instruction hasn't actually executed
2005 yet. If we were to evaluate the watchpoint expression
2006 now, we would get the old value, and therefore no change
2007 would seem to have occurred.
2009 In order to make watchpoints work `right', we really need
2010 to complete the memory write, and then evaluate the
2011 watchpoint expression. The following code does that by
2012 removing the watchpoint (actually, all watchpoints and
2013 breakpoints), single-stepping the target, re-inserting
2014 watchpoints, and then falling through to let normal
2015 single-step processing handle proceed. Since this
2016 includes evaluating watchpoints, things will come to a
2017 stop in the correct manner. */
2019 write_pc (stop_pc
- DECR_PC_AFTER_BREAK
);
2021 remove_breakpoints ();
2022 registers_changed ();
2023 target_resume (ecs
->ptid
, 1, TARGET_SIGNAL_0
); /* Single step */
2025 ecs
->waiton_ptid
= ecs
->ptid
;
2026 ecs
->wp
= &(ecs
->ws
);
2027 ecs
->infwait_state
= infwait_nonstep_watch_state
;
2028 prepare_to_wait (ecs
);
2032 /* It may be possible to simply continue after a watchpoint. */
2033 if (HAVE_CONTINUABLE_WATCHPOINT
)
2034 STOPPED_BY_WATCHPOINT (ecs
->ws
);
2036 ecs
->stop_func_start
= 0;
2037 ecs
->stop_func_end
= 0;
2038 ecs
->stop_func_name
= 0;
2039 /* Don't care about return value; stop_func_start and stop_func_name
2040 will both be 0 if it doesn't work. */
2041 find_pc_partial_function (stop_pc
, &ecs
->stop_func_name
,
2042 &ecs
->stop_func_start
, &ecs
->stop_func_end
);
2043 ecs
->stop_func_start
+= FUNCTION_START_OFFSET
;
2044 ecs
->another_trap
= 0;
2045 bpstat_clear (&stop_bpstat
);
2047 stop_stack_dummy
= 0;
2048 stop_print_frame
= 1;
2049 ecs
->random_signal
= 0;
2050 stopped_by_random_signal
= 0;
2051 breakpoints_failed
= 0;
2053 /* Look at the cause of the stop, and decide what to do.
2054 The alternatives are:
2055 1) break; to really stop and return to the debugger,
2056 2) drop through to start up again
2057 (set ecs->another_trap to 1 to single step once)
2058 3) set ecs->random_signal to 1, and the decision between 1 and 2
2059 will be made according to the signal handling tables. */
2061 /* First, distinguish signals caused by the debugger from signals
2062 that have to do with the program's own actions.
2063 Note that breakpoint insns may cause SIGTRAP or SIGILL
2064 or SIGEMT, depending on the operating system version.
2065 Here we detect when a SIGILL or SIGEMT is really a breakpoint
2066 and change it to SIGTRAP. */
2068 if (stop_signal
== TARGET_SIGNAL_TRAP
2069 || (breakpoints_inserted
&&
2070 (stop_signal
== TARGET_SIGNAL_ILL
2071 || stop_signal
== TARGET_SIGNAL_EMT
2073 || stop_soon_quietly
)
2075 if (stop_signal
== TARGET_SIGNAL_TRAP
&& stop_after_trap
)
2077 stop_print_frame
= 0;
2078 stop_stepping (ecs
);
2081 if (stop_soon_quietly
)
2083 stop_stepping (ecs
);
2087 /* Don't even think about breakpoints
2088 if just proceeded over a breakpoint.
2090 However, if we are trying to proceed over a breakpoint
2091 and end up in sigtramp, then through_sigtramp_breakpoint
2092 will be set and we should check whether we've hit the
2094 if (stop_signal
== TARGET_SIGNAL_TRAP
&& trap_expected
2095 && through_sigtramp_breakpoint
== NULL
)
2096 bpstat_clear (&stop_bpstat
);
2099 /* See if there is a breakpoint at the current PC. */
2100 stop_bpstat
= bpstat_stop_status
2102 /* Pass TRUE if our reason for stopping is something other
2103 than hitting a breakpoint. We do this by checking that
2104 1) stepping is going on and 2) we didn't hit a breakpoint
2105 in a signal handler without an intervening stop in
2106 sigtramp, which is detected by a new stack pointer value
2107 below any usual function calling stack adjustments. */
2108 (currently_stepping (ecs
)
2110 && INNER_THAN (read_sp (), (step_sp
- 16))))
2112 /* Following in case break condition called a
2114 stop_print_frame
= 1;
2117 if (stop_signal
== TARGET_SIGNAL_TRAP
)
2119 = !(bpstat_explains_signal (stop_bpstat
)
2121 || (!CALL_DUMMY_BREAKPOINT_OFFSET_P
2122 && PC_IN_CALL_DUMMY (stop_pc
, read_sp (),
2123 FRAME_FP (get_current_frame ())))
2124 || (step_range_end
&& step_resume_breakpoint
== NULL
));
2129 = !(bpstat_explains_signal (stop_bpstat
)
2130 /* End of a stack dummy. Some systems (e.g. Sony
2131 news) give another signal besides SIGTRAP, so
2132 check here as well as above. */
2133 || (!CALL_DUMMY_BREAKPOINT_OFFSET_P
2134 && PC_IN_CALL_DUMMY (stop_pc
, read_sp (),
2135 FRAME_FP (get_current_frame ())))
2137 if (!ecs
->random_signal
)
2138 stop_signal
= TARGET_SIGNAL_TRAP
;
2142 /* When we reach this point, we've pretty much decided
2143 that the reason for stopping must've been a random
2144 (unexpected) signal. */
2147 ecs
->random_signal
= 1;
2148 /* If a fork, vfork or exec event was seen, then there are two
2149 possible responses we can make:
2151 1. If a catchpoint triggers for the event (ecs->random_signal == 0),
2152 then we must stop now and issue a prompt. We will resume
2153 the inferior when the user tells us to.
2154 2. If no catchpoint triggers for the event (ecs->random_signal == 1),
2155 then we must resume the inferior now and keep checking.
2157 In either case, we must take appropriate steps to "follow" the
2158 the fork/vfork/exec when the inferior is resumed. For example,
2159 if follow-fork-mode is "child", then we must detach from the
2160 parent inferior and follow the new child inferior.
2162 In either case, setting pending_follow causes the next resume()
2163 to take the appropriate following action. */
2164 process_event_stop_test
:
2165 if (ecs
->ws
.kind
== TARGET_WAITKIND_FORKED
)
2167 if (ecs
->random_signal
) /* I.e., no catchpoint triggered for this. */
2170 stop_signal
= TARGET_SIGNAL_0
;
2175 else if (ecs
->ws
.kind
== TARGET_WAITKIND_VFORKED
)
2177 if (ecs
->random_signal
) /* I.e., no catchpoint triggered for this. */
2179 stop_signal
= TARGET_SIGNAL_0
;
2184 else if (ecs
->ws
.kind
== TARGET_WAITKIND_EXECD
)
2186 pending_follow
.kind
= ecs
->ws
.kind
;
2187 if (ecs
->random_signal
) /* I.e., no catchpoint triggered for this. */
2190 stop_signal
= TARGET_SIGNAL_0
;
2196 /* For the program's own signals, act according to
2197 the signal handling tables. */
2199 if (ecs
->random_signal
)
2201 /* Signal not for debugging purposes. */
2204 stopped_by_random_signal
= 1;
2206 if (signal_print
[stop_signal
])
2209 target_terminal_ours_for_output ();
2210 print_stop_reason (SIGNAL_RECEIVED
, stop_signal
);
2212 if (signal_stop
[stop_signal
])
2214 stop_stepping (ecs
);
2217 /* If not going to stop, give terminal back
2218 if we took it away. */
2220 target_terminal_inferior ();
2222 /* Clear the signal if it should not be passed. */
2223 if (signal_program
[stop_signal
] == 0)
2224 stop_signal
= TARGET_SIGNAL_0
;
2226 /* I'm not sure whether this needs to be check_sigtramp2 or
2227 whether it could/should be keep_going.
2229 This used to jump to step_over_function if we are stepping,
2232 Suppose the user does a `next' over a function call, and while
2233 that call is in progress, the inferior receives a signal for
2234 which GDB does not stop (i.e., signal_stop[SIG] is false). In
2235 that case, when we reach this point, there is already a
2236 step-resume breakpoint established, right where it should be:
2237 immediately after the function call the user is "next"-ing
2238 over. If we call step_over_function now, two bad things
2241 - we'll create a new breakpoint, at wherever the current
2242 frame's return address happens to be. That could be
2243 anywhere, depending on what function call happens to be on
2244 the top of the stack at that point. Point is, it's probably
2245 not where we need it.
2247 - the existing step-resume breakpoint (which is at the correct
2248 address) will get orphaned: step_resume_breakpoint will point
2249 to the new breakpoint, and the old step-resume breakpoint
2250 will never be cleaned up.
2252 The old behavior was meant to help HP-UX single-step out of
2253 sigtramps. It would place the new breakpoint at prev_pc, which
2254 was certainly wrong. I don't know the details there, so fixing
2255 this probably breaks that. As with anything else, it's up to
2256 the HP-UX maintainer to furnish a fix that doesn't break other
2257 platforms. --JimB, 20 May 1999 */
2258 check_sigtramp2 (ecs
);
2263 /* Handle cases caused by hitting a breakpoint. */
2265 CORE_ADDR jmp_buf_pc
;
2266 struct bpstat_what what
;
2268 what
= bpstat_what (stop_bpstat
);
2270 if (what
.call_dummy
)
2272 stop_stack_dummy
= 1;
2274 trap_expected_after_continue
= 1;
2278 switch (what
.main_action
)
2280 case BPSTAT_WHAT_SET_LONGJMP_RESUME
:
2281 /* If we hit the breakpoint at longjmp, disable it for the
2282 duration of this command. Then, install a temporary
2283 breakpoint at the target of the jmp_buf. */
2284 disable_longjmp_breakpoint ();
2285 remove_breakpoints ();
2286 breakpoints_inserted
= 0;
2287 if (!GET_LONGJMP_TARGET (&jmp_buf_pc
))
2293 /* Need to blow away step-resume breakpoint, as it
2294 interferes with us */
2295 if (step_resume_breakpoint
!= NULL
)
2297 delete_step_resume_breakpoint (&step_resume_breakpoint
);
2299 /* Not sure whether we need to blow this away too, but probably
2300 it is like the step-resume breakpoint. */
2301 if (through_sigtramp_breakpoint
!= NULL
)
2303 delete_breakpoint (through_sigtramp_breakpoint
);
2304 through_sigtramp_breakpoint
= NULL
;
2308 /* FIXME - Need to implement nested temporary breakpoints */
2309 if (step_over_calls
> 0)
2310 set_longjmp_resume_breakpoint (jmp_buf_pc
,
2311 get_current_frame ());
2314 set_longjmp_resume_breakpoint (jmp_buf_pc
, NULL
);
2315 ecs
->handling_longjmp
= 1; /* FIXME */
2319 case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME
:
2320 case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME_SINGLE
:
2321 remove_breakpoints ();
2322 breakpoints_inserted
= 0;
2324 /* FIXME - Need to implement nested temporary breakpoints */
2326 && (INNER_THAN (FRAME_FP (get_current_frame ()),
2327 step_frame_address
)))
2329 ecs
->another_trap
= 1;
2334 disable_longjmp_breakpoint ();
2335 ecs
->handling_longjmp
= 0; /* FIXME */
2336 if (what
.main_action
== BPSTAT_WHAT_CLEAR_LONGJMP_RESUME
)
2338 /* else fallthrough */
2340 case BPSTAT_WHAT_SINGLE
:
2341 if (breakpoints_inserted
)
2343 remove_breakpoints ();
2345 breakpoints_inserted
= 0;
2346 ecs
->another_trap
= 1;
2347 /* Still need to check other stuff, at least the case
2348 where we are stepping and step out of the right range. */
2351 case BPSTAT_WHAT_STOP_NOISY
:
2352 stop_print_frame
= 1;
2354 /* We are about to nuke the step_resume_breakpoint and
2355 through_sigtramp_breakpoint via the cleanup chain, so
2356 no need to worry about it here. */
2358 stop_stepping (ecs
);
2361 case BPSTAT_WHAT_STOP_SILENT
:
2362 stop_print_frame
= 0;
2364 /* We are about to nuke the step_resume_breakpoint and
2365 through_sigtramp_breakpoint via the cleanup chain, so
2366 no need to worry about it here. */
2368 stop_stepping (ecs
);
2371 case BPSTAT_WHAT_STEP_RESUME
:
2372 /* This proably demands a more elegant solution, but, yeah
2375 This function's use of the simple variable
2376 step_resume_breakpoint doesn't seem to accomodate
2377 simultaneously active step-resume bp's, although the
2378 breakpoint list certainly can.
2380 If we reach here and step_resume_breakpoint is already
2381 NULL, then apparently we have multiple active
2382 step-resume bp's. We'll just delete the breakpoint we
2383 stopped at, and carry on.
2385 Correction: what the code currently does is delete a
2386 step-resume bp, but it makes no effort to ensure that
2387 the one deleted is the one currently stopped at. MVS */
2389 if (step_resume_breakpoint
== NULL
)
2391 step_resume_breakpoint
=
2392 bpstat_find_step_resume_breakpoint (stop_bpstat
);
2394 delete_step_resume_breakpoint (&step_resume_breakpoint
);
2397 case BPSTAT_WHAT_THROUGH_SIGTRAMP
:
2398 if (through_sigtramp_breakpoint
)
2399 delete_breakpoint (through_sigtramp_breakpoint
);
2400 through_sigtramp_breakpoint
= NULL
;
2402 /* If were waiting for a trap, hitting the step_resume_break
2403 doesn't count as getting it. */
2405 ecs
->another_trap
= 1;
2408 case BPSTAT_WHAT_CHECK_SHLIBS
:
2409 case BPSTAT_WHAT_CHECK_SHLIBS_RESUME_FROM_HOOK
:
2412 /* Remove breakpoints, we eventually want to step over the
2413 shlib event breakpoint, and SOLIB_ADD might adjust
2414 breakpoint addresses via breakpoint_re_set. */
2415 if (breakpoints_inserted
)
2416 remove_breakpoints ();
2417 breakpoints_inserted
= 0;
2419 /* Check for any newly added shared libraries if we're
2420 supposed to be adding them automatically. */
2423 /* Switch terminal for any messages produced by
2424 breakpoint_re_set. */
2425 target_terminal_ours_for_output ();
2426 SOLIB_ADD (NULL
, 0, NULL
);
2427 target_terminal_inferior ();
2430 /* Try to reenable shared library breakpoints, additional
2431 code segments in shared libraries might be mapped in now. */
2432 re_enable_breakpoints_in_shlibs ();
2434 /* If requested, stop when the dynamic linker notifies
2435 gdb of events. This allows the user to get control
2436 and place breakpoints in initializer routines for
2437 dynamically loaded objects (among other things). */
2438 if (stop_on_solib_events
)
2440 stop_stepping (ecs
);
2444 /* If we stopped due to an explicit catchpoint, then the
2445 (see above) call to SOLIB_ADD pulled in any symbols
2446 from a newly-loaded library, if appropriate.
2448 We do want the inferior to stop, but not where it is
2449 now, which is in the dynamic linker callback. Rather,
2450 we would like it stop in the user's program, just after
2451 the call that caused this catchpoint to trigger. That
2452 gives the user a more useful vantage from which to
2453 examine their program's state. */
2454 else if (what
.main_action
== BPSTAT_WHAT_CHECK_SHLIBS_RESUME_FROM_HOOK
)
2456 /* ??rehrauer: If I could figure out how to get the
2457 right return PC from here, we could just set a temp
2458 breakpoint and resume. I'm not sure we can without
2459 cracking open the dld's shared libraries and sniffing
2460 their unwind tables and text/data ranges, and that's
2461 not a terribly portable notion.
2463 Until that time, we must step the inferior out of the
2464 dld callback, and also out of the dld itself (and any
2465 code or stubs in libdld.sl, such as "shl_load" and
2466 friends) until we reach non-dld code. At that point,
2467 we can stop stepping. */
2468 bpstat_get_triggered_catchpoints (stop_bpstat
,
2469 &ecs
->stepping_through_solib_catchpoints
);
2470 ecs
->stepping_through_solib_after_catch
= 1;
2472 /* Be sure to lift all breakpoints, so the inferior does
2473 actually step past this point... */
2474 ecs
->another_trap
= 1;
2479 /* We want to step over this breakpoint, then keep going. */
2480 ecs
->another_trap
= 1;
2487 case BPSTAT_WHAT_LAST
:
2488 /* Not a real code, but listed here to shut up gcc -Wall. */
2490 case BPSTAT_WHAT_KEEP_CHECKING
:
2495 /* We come here if we hit a breakpoint but should not
2496 stop for it. Possibly we also were stepping
2497 and should stop for that. So fall through and
2498 test for stepping. But, if not stepping,
2501 /* Are we stepping to get the inferior out of the dynamic
2502 linker's hook (and possibly the dld itself) after catching
2504 if (ecs
->stepping_through_solib_after_catch
)
2506 #if defined(SOLIB_ADD)
2507 /* Have we reached our destination? If not, keep going. */
2508 if (SOLIB_IN_DYNAMIC_LINKER (PIDGET (ecs
->ptid
), stop_pc
))
2510 ecs
->another_trap
= 1;
2515 /* Else, stop and report the catchpoint(s) whose triggering
2516 caused us to begin stepping. */
2517 ecs
->stepping_through_solib_after_catch
= 0;
2518 bpstat_clear (&stop_bpstat
);
2519 stop_bpstat
= bpstat_copy (ecs
->stepping_through_solib_catchpoints
);
2520 bpstat_clear (&ecs
->stepping_through_solib_catchpoints
);
2521 stop_print_frame
= 1;
2522 stop_stepping (ecs
);
2526 if (!CALL_DUMMY_BREAKPOINT_OFFSET_P
)
2528 /* This is the old way of detecting the end of the stack dummy.
2529 An architecture which defines CALL_DUMMY_BREAKPOINT_OFFSET gets
2530 handled above. As soon as we can test it on all of them, all
2531 architectures should define it. */
2533 /* If this is the breakpoint at the end of a stack dummy,
2534 just stop silently, unless the user was doing an si/ni, in which
2535 case she'd better know what she's doing. */
2537 if (CALL_DUMMY_HAS_COMPLETED (stop_pc
, read_sp (),
2538 FRAME_FP (get_current_frame ()))
2541 stop_print_frame
= 0;
2542 stop_stack_dummy
= 1;
2544 trap_expected_after_continue
= 1;
2546 stop_stepping (ecs
);
2551 if (step_resume_breakpoint
)
2553 /* Having a step-resume breakpoint overrides anything
2554 else having to do with stepping commands until
2555 that breakpoint is reached. */
2556 /* I'm not sure whether this needs to be check_sigtramp2 or
2557 whether it could/should be keep_going. */
2558 check_sigtramp2 (ecs
);
2563 if (step_range_end
== 0)
2565 /* Likewise if we aren't even stepping. */
2566 /* I'm not sure whether this needs to be check_sigtramp2 or
2567 whether it could/should be keep_going. */
2568 check_sigtramp2 (ecs
);
2573 /* If stepping through a line, keep going if still within it.
2575 Note that step_range_end is the address of the first instruction
2576 beyond the step range, and NOT the address of the last instruction
2578 if (stop_pc
>= step_range_start
2579 && stop_pc
< step_range_end
)
2581 /* We might be doing a BPSTAT_WHAT_SINGLE and getting a signal.
2582 So definately need to check for sigtramp here. */
2583 check_sigtramp2 (ecs
);
2588 /* We stepped out of the stepping range. */
2590 /* If we are stepping at the source level and entered the runtime
2591 loader dynamic symbol resolution code, we keep on single stepping
2592 until we exit the run time loader code and reach the callee's
2594 if (step_over_calls
== STEP_OVER_UNDEBUGGABLE
&& IN_SOLIB_DYNSYM_RESOLVE_CODE (stop_pc
))
2596 CORE_ADDR pc_after_resolver
= SKIP_SOLIB_RESOLVER (stop_pc
);
2598 if (pc_after_resolver
)
2600 /* Set up a step-resume breakpoint at the address
2601 indicated by SKIP_SOLIB_RESOLVER. */
2602 struct symtab_and_line sr_sal
;
2604 sr_sal
.pc
= pc_after_resolver
;
2606 check_for_old_step_resume_breakpoint ();
2607 step_resume_breakpoint
=
2608 set_momentary_breakpoint (sr_sal
, NULL
, bp_step_resume
);
2609 if (breakpoints_inserted
)
2610 insert_breakpoints ();
2617 /* We can't update step_sp every time through the loop, because
2618 reading the stack pointer would slow down stepping too much.
2619 But we can update it every time we leave the step range. */
2620 ecs
->update_step_sp
= 1;
2622 /* Did we just take a signal? */
2623 if (IN_SIGTRAMP (stop_pc
, ecs
->stop_func_name
)
2624 && !IN_SIGTRAMP (prev_pc
, prev_func_name
)
2625 && INNER_THAN (read_sp (), step_sp
))
2627 /* We've just taken a signal; go until we are back to
2628 the point where we took it and one more. */
2630 /* Note: The test above succeeds not only when we stepped
2631 into a signal handler, but also when we step past the last
2632 statement of a signal handler and end up in the return stub
2633 of the signal handler trampoline. To distinguish between
2634 these two cases, check that the frame is INNER_THAN the
2635 previous one below. pai/1997-09-11 */
2639 CORE_ADDR current_frame
= FRAME_FP (get_current_frame ());
2641 if (INNER_THAN (current_frame
, step_frame_address
))
2643 /* We have just taken a signal; go until we are back to
2644 the point where we took it and one more. */
2646 /* This code is needed at least in the following case:
2647 The user types "next" and then a signal arrives (before
2648 the "next" is done). */
2650 /* Note that if we are stopped at a breakpoint, then we need
2651 the step_resume breakpoint to override any breakpoints at
2652 the same location, so that we will still step over the
2653 breakpoint even though the signal happened. */
2654 struct symtab_and_line sr_sal
;
2657 sr_sal
.symtab
= NULL
;
2659 sr_sal
.pc
= prev_pc
;
2660 /* We could probably be setting the frame to
2661 step_frame_address; I don't think anyone thought to
2663 check_for_old_step_resume_breakpoint ();
2664 step_resume_breakpoint
=
2665 set_momentary_breakpoint (sr_sal
, NULL
, bp_step_resume
);
2666 if (breakpoints_inserted
)
2667 insert_breakpoints ();
2671 /* We just stepped out of a signal handler and into
2672 its calling trampoline.
2674 Normally, we'd call step_over_function from
2675 here, but for some reason GDB can't unwind the
2676 stack correctly to find the real PC for the point
2677 user code where the signal trampoline will return
2678 -- FRAME_SAVED_PC fails, at least on HP-UX 10.20.
2679 But signal trampolines are pretty small stubs of
2680 code, anyway, so it's OK instead to just
2681 single-step out. Note: assuming such trampolines
2682 don't exhibit recursion on any platform... */
2683 find_pc_partial_function (stop_pc
, &ecs
->stop_func_name
,
2684 &ecs
->stop_func_start
,
2685 &ecs
->stop_func_end
);
2686 /* Readjust stepping range */
2687 step_range_start
= ecs
->stop_func_start
;
2688 step_range_end
= ecs
->stop_func_end
;
2689 ecs
->stepping_through_sigtramp
= 1;
2694 /* If this is stepi or nexti, make sure that the stepping range
2695 gets us past that instruction. */
2696 if (step_range_end
== 1)
2697 /* FIXME: Does this run afoul of the code below which, if
2698 we step into the middle of a line, resets the stepping
2700 step_range_end
= (step_range_start
= prev_pc
) + 1;
2702 ecs
->remove_breakpoints_on_following_step
= 1;
2707 if (stop_pc
== ecs
->stop_func_start
/* Quick test */
2708 || (in_prologue (stop_pc
, ecs
->stop_func_start
) &&
2709 !IN_SOLIB_RETURN_TRAMPOLINE (stop_pc
, ecs
->stop_func_name
))
2710 || IN_SOLIB_CALL_TRAMPOLINE (stop_pc
, ecs
->stop_func_name
)
2711 || ecs
->stop_func_name
== 0)
2713 /* It's a subroutine call. */
2715 if (step_over_calls
== STEP_OVER_NONE
)
2717 /* I presume that step_over_calls is only 0 when we're
2718 supposed to be stepping at the assembly language level
2719 ("stepi"). Just stop. */
2721 print_stop_reason (END_STEPPING_RANGE
, 0);
2722 stop_stepping (ecs
);
2726 if (step_over_calls
== STEP_OVER_ALL
|| IGNORE_HELPER_CALL (stop_pc
))
2728 /* We're doing a "next". */
2730 if (IN_SIGTRAMP (stop_pc
, ecs
->stop_func_name
)
2731 && INNER_THAN (step_frame_address
, read_sp()))
2732 /* We stepped out of a signal handler, and into its
2733 calling trampoline. This is misdetected as a
2734 subroutine call, but stepping over the signal
2735 trampoline isn't such a bad idea. In order to do
2736 that, we have to ignore the value in
2737 step_frame_address, since that doesn't represent the
2738 frame that'll reach when we return from the signal
2739 trampoline. Otherwise we'll probably continue to the
2740 end of the program. */
2741 step_frame_address
= 0;
2743 step_over_function (ecs
);
2748 /* If we are in a function call trampoline (a stub between
2749 the calling routine and the real function), locate the real
2750 function. That's what tells us (a) whether we want to step
2751 into it at all, and (b) what prologue we want to run to
2752 the end of, if we do step into it. */
2753 tmp
= SKIP_TRAMPOLINE_CODE (stop_pc
);
2755 ecs
->stop_func_start
= tmp
;
2758 tmp
= DYNAMIC_TRAMPOLINE_NEXTPC (stop_pc
);
2761 struct symtab_and_line xxx
;
2762 /* Why isn't this s_a_l called "sr_sal", like all of the
2763 other s_a_l's where this code is duplicated? */
2764 INIT_SAL (&xxx
); /* initialize to zeroes */
2766 xxx
.section
= find_pc_overlay (xxx
.pc
);
2767 check_for_old_step_resume_breakpoint ();
2768 step_resume_breakpoint
=
2769 set_momentary_breakpoint (xxx
, NULL
, bp_step_resume
);
2770 insert_breakpoints ();
2776 /* If we have line number information for the function we
2777 are thinking of stepping into, step into it.
2779 If there are several symtabs at that PC (e.g. with include
2780 files), just want to know whether *any* of them have line
2781 numbers. find_pc_line handles this. */
2783 struct symtab_and_line tmp_sal
;
2785 tmp_sal
= find_pc_line (ecs
->stop_func_start
, 0);
2786 if (tmp_sal
.line
!= 0)
2788 step_into_function (ecs
);
2793 /* If we have no line number and the step-stop-if-no-debug
2794 is set, we stop the step so that the user has a chance to
2795 switch in assembly mode. */
2796 if (step_over_calls
== STEP_OVER_UNDEBUGGABLE
&& step_stop_if_no_debug
)
2799 print_stop_reason (END_STEPPING_RANGE
, 0);
2800 stop_stepping (ecs
);
2804 step_over_function (ecs
);
2810 /* We've wandered out of the step range. */
2812 ecs
->sal
= find_pc_line (stop_pc
, 0);
2814 if (step_range_end
== 1)
2816 /* It is stepi or nexti. We always want to stop stepping after
2819 print_stop_reason (END_STEPPING_RANGE
, 0);
2820 stop_stepping (ecs
);
2824 /* If we're in the return path from a shared library trampoline,
2825 we want to proceed through the trampoline when stepping. */
2826 if (IN_SOLIB_RETURN_TRAMPOLINE (stop_pc
, ecs
->stop_func_name
))
2830 /* Determine where this trampoline returns. */
2831 tmp
= SKIP_TRAMPOLINE_CODE (stop_pc
);
2833 /* Only proceed through if we know where it's going. */
2836 /* And put the step-breakpoint there and go until there. */
2837 struct symtab_and_line sr_sal
;
2839 INIT_SAL (&sr_sal
); /* initialize to zeroes */
2841 sr_sal
.section
= find_pc_overlay (sr_sal
.pc
);
2842 /* Do not specify what the fp should be when we stop
2843 since on some machines the prologue
2844 is where the new fp value is established. */
2845 check_for_old_step_resume_breakpoint ();
2846 step_resume_breakpoint
=
2847 set_momentary_breakpoint (sr_sal
, NULL
, bp_step_resume
);
2848 if (breakpoints_inserted
)
2849 insert_breakpoints ();
2851 /* Restart without fiddling with the step ranges or
2858 if (ecs
->sal
.line
== 0)
2860 /* We have no line number information. That means to stop
2861 stepping (does this always happen right after one instruction,
2862 when we do "s" in a function with no line numbers,
2863 or can this happen as a result of a return or longjmp?). */
2865 print_stop_reason (END_STEPPING_RANGE
, 0);
2866 stop_stepping (ecs
);
2870 if ((stop_pc
== ecs
->sal
.pc
)
2871 && (ecs
->current_line
!= ecs
->sal
.line
|| ecs
->current_symtab
!= ecs
->sal
.symtab
))
2873 /* We are at the start of a different line. So stop. Note that
2874 we don't stop if we step into the middle of a different line.
2875 That is said to make things like for (;;) statements work
2878 print_stop_reason (END_STEPPING_RANGE
, 0);
2879 stop_stepping (ecs
);
2883 /* We aren't done stepping.
2885 Optimize by setting the stepping range to the line.
2886 (We might not be in the original line, but if we entered a
2887 new line in mid-statement, we continue stepping. This makes
2888 things like for(;;) statements work better.) */
2890 if (ecs
->stop_func_end
&& ecs
->sal
.end
>= ecs
->stop_func_end
)
2892 /* If this is the last line of the function, don't keep stepping
2893 (it would probably step us out of the function).
2894 This is particularly necessary for a one-line function,
2895 in which after skipping the prologue we better stop even though
2896 we will be in mid-line. */
2898 print_stop_reason (END_STEPPING_RANGE
, 0);
2899 stop_stepping (ecs
);
2902 step_range_start
= ecs
->sal
.pc
;
2903 step_range_end
= ecs
->sal
.end
;
2904 step_frame_address
= FRAME_FP (get_current_frame ());
2905 ecs
->current_line
= ecs
->sal
.line
;
2906 ecs
->current_symtab
= ecs
->sal
.symtab
;
2908 /* In the case where we just stepped out of a function into the middle
2909 of a line of the caller, continue stepping, but step_frame_address
2910 must be modified to current frame */
2912 CORE_ADDR current_frame
= FRAME_FP (get_current_frame ());
2913 if (!(INNER_THAN (current_frame
, step_frame_address
)))
2914 step_frame_address
= current_frame
;
2919 } /* extra brace, to preserve old indentation */
2922 /* Are we in the middle of stepping? */
2925 currently_stepping (struct execution_control_state
*ecs
)
2927 return ((through_sigtramp_breakpoint
== NULL
2928 && !ecs
->handling_longjmp
2929 && ((step_range_end
&& step_resume_breakpoint
== NULL
)
2931 || ecs
->stepping_through_solib_after_catch
2932 || bpstat_should_step ());
2936 check_sigtramp2 (struct execution_control_state
*ecs
)
2939 && IN_SIGTRAMP (stop_pc
, ecs
->stop_func_name
)
2940 && !IN_SIGTRAMP (prev_pc
, prev_func_name
)
2941 && INNER_THAN (read_sp (), step_sp
))
2943 /* What has happened here is that we have just stepped the
2944 inferior with a signal (because it is a signal which
2945 shouldn't make us stop), thus stepping into sigtramp.
2947 So we need to set a step_resume_break_address breakpoint and
2948 continue until we hit it, and then step. FIXME: This should
2949 be more enduring than a step_resume breakpoint; we should
2950 know that we will later need to keep going rather than
2951 re-hitting the breakpoint here (see the testsuite,
2952 gdb.base/signals.exp where it says "exceedingly difficult"). */
2954 struct symtab_and_line sr_sal
;
2956 INIT_SAL (&sr_sal
); /* initialize to zeroes */
2957 sr_sal
.pc
= prev_pc
;
2958 sr_sal
.section
= find_pc_overlay (sr_sal
.pc
);
2959 /* We perhaps could set the frame if we kept track of what the
2960 frame corresponding to prev_pc was. But we don't, so don't. */
2961 through_sigtramp_breakpoint
=
2962 set_momentary_breakpoint (sr_sal
, NULL
, bp_through_sigtramp
);
2963 if (breakpoints_inserted
)
2964 insert_breakpoints ();
2966 ecs
->remove_breakpoints_on_following_step
= 1;
2967 ecs
->another_trap
= 1;
2971 /* Subroutine call with source code we should not step over. Do step
2972 to the first line of code in it. */
2975 step_into_function (struct execution_control_state
*ecs
)
2978 struct symtab_and_line sr_sal
;
2980 s
= find_pc_symtab (stop_pc
);
2981 if (s
&& s
->language
!= language_asm
)
2982 ecs
->stop_func_start
= SKIP_PROLOGUE (ecs
->stop_func_start
);
2984 ecs
->sal
= find_pc_line (ecs
->stop_func_start
, 0);
2985 /* Use the step_resume_break to step until the end of the prologue,
2986 even if that involves jumps (as it seems to on the vax under
2988 /* If the prologue ends in the middle of a source line, continue to
2989 the end of that source line (if it is still within the function).
2990 Otherwise, just go to end of prologue. */
2991 #ifdef PROLOGUE_FIRSTLINE_OVERLAP
2992 /* no, don't either. It skips any code that's legitimately on the
2996 && ecs
->sal
.pc
!= ecs
->stop_func_start
2997 && ecs
->sal
.end
< ecs
->stop_func_end
)
2998 ecs
->stop_func_start
= ecs
->sal
.end
;
3001 if (ecs
->stop_func_start
== stop_pc
)
3003 /* We are already there: stop now. */
3005 print_stop_reason (END_STEPPING_RANGE
, 0);
3006 stop_stepping (ecs
);
3011 /* Put the step-breakpoint there and go until there. */
3012 INIT_SAL (&sr_sal
); /* initialize to zeroes */
3013 sr_sal
.pc
= ecs
->stop_func_start
;
3014 sr_sal
.section
= find_pc_overlay (ecs
->stop_func_start
);
3015 /* Do not specify what the fp should be when we stop since on
3016 some machines the prologue is where the new fp value is
3018 check_for_old_step_resume_breakpoint ();
3019 step_resume_breakpoint
=
3020 set_momentary_breakpoint (sr_sal
, NULL
, bp_step_resume
);
3021 if (breakpoints_inserted
)
3022 insert_breakpoints ();
3024 /* And make sure stepping stops right away then. */
3025 step_range_end
= step_range_start
;
3030 /* We've just entered a callee, and we wish to resume until it returns
3031 to the caller. Setting a step_resume breakpoint on the return
3032 address will catch a return from the callee.
3034 However, if the callee is recursing, we want to be careful not to
3035 catch returns of those recursive calls, but only of THIS instance
3038 To do this, we set the step_resume bp's frame to our current
3039 caller's frame (step_frame_address, which is set by the "next" or
3040 "until" command, before execution begins). */
3043 step_over_function (struct execution_control_state
*ecs
)
3045 struct symtab_and_line sr_sal
;
3047 INIT_SAL (&sr_sal
); /* initialize to zeros */
3048 sr_sal
.pc
= ADDR_BITS_REMOVE (SAVED_PC_AFTER_CALL (get_current_frame ()));
3049 sr_sal
.section
= find_pc_overlay (sr_sal
.pc
);
3051 check_for_old_step_resume_breakpoint ();
3052 step_resume_breakpoint
=
3053 set_momentary_breakpoint (sr_sal
, get_current_frame (), bp_step_resume
);
3055 if (step_frame_address
&& !IN_SOLIB_DYNSYM_RESOLVE_CODE (sr_sal
.pc
))
3056 step_resume_breakpoint
->frame
= step_frame_address
;
3058 if (breakpoints_inserted
)
3059 insert_breakpoints ();
3063 stop_stepping (struct execution_control_state
*ecs
)
3065 if (target_has_execution
)
3067 /* Are we stopping for a vfork event? We only stop when we see
3068 the child's event. However, we may not yet have seen the
3069 parent's event. And, inferior_ptid is still set to the
3070 parent's pid, until we resume again and follow either the
3073 To ensure that we can really touch inferior_ptid (aka, the
3074 parent process) -- which calls to functions like read_pc
3075 implicitly do -- wait on the parent if necessary. */
3076 if ((pending_follow
.kind
== TARGET_WAITKIND_VFORKED
)
3077 && !pending_follow
.fork_event
.saw_parent_fork
)
3083 if (target_wait_hook
)
3084 parent_ptid
= target_wait_hook (pid_to_ptid (-1), &(ecs
->ws
));
3086 parent_ptid
= target_wait (pid_to_ptid (-1), &(ecs
->ws
));
3088 while (! ptid_equal (parent_ptid
, inferior_ptid
));
3091 /* Assuming the inferior still exists, set these up for next
3092 time, just like we did above if we didn't break out of the
3094 prev_pc
= read_pc ();
3095 prev_func_start
= ecs
->stop_func_start
;
3096 prev_func_name
= ecs
->stop_func_name
;
3099 /* Let callers know we don't want to wait for the inferior anymore. */
3100 ecs
->wait_some_more
= 0;
3103 /* This function handles various cases where we need to continue
3104 waiting for the inferior. */
3105 /* (Used to be the keep_going: label in the old wait_for_inferior) */
3108 keep_going (struct execution_control_state
*ecs
)
3110 /* ??rehrauer: ttrace on HP-UX theoretically allows one to debug a
3111 vforked child between its creation and subsequent exit or call to
3112 exec(). However, I had big problems in this rather creaky exec
3113 engine, getting that to work. The fundamental problem is that
3114 I'm trying to debug two processes via an engine that only
3115 understands a single process with possibly multiple threads.
3117 Hence, this spot is known to have problems when
3118 target_can_follow_vfork_prior_to_exec returns 1. */
3120 /* Save the pc before execution, to compare with pc after stop. */
3121 prev_pc
= read_pc (); /* Might have been DECR_AFTER_BREAK */
3122 prev_func_start
= ecs
->stop_func_start
; /* Ok, since if DECR_PC_AFTER
3123 BREAK is defined, the
3124 original pc would not have
3125 been at the start of a
3127 prev_func_name
= ecs
->stop_func_name
;
3129 if (ecs
->update_step_sp
)
3130 step_sp
= read_sp ();
3131 ecs
->update_step_sp
= 0;
3133 /* If we did not do break;, it means we should keep running the
3134 inferior and not return to debugger. */
3136 if (trap_expected
&& stop_signal
!= TARGET_SIGNAL_TRAP
)
3138 /* We took a signal (which we are supposed to pass through to
3139 the inferior, else we'd have done a break above) and we
3140 haven't yet gotten our trap. Simply continue. */
3141 resume (currently_stepping (ecs
), stop_signal
);
3145 /* Either the trap was not expected, but we are continuing
3146 anyway (the user asked that this signal be passed to the
3149 The signal was SIGTRAP, e.g. it was our signal, but we
3150 decided we should resume from it.
3152 We're going to run this baby now!
3154 Insert breakpoints now, unless we are trying to one-proceed
3155 past a breakpoint. */
3156 /* If we've just finished a special step resume and we don't
3157 want to hit a breakpoint, pull em out. */
3158 if (step_resume_breakpoint
== NULL
3159 && through_sigtramp_breakpoint
== NULL
3160 && ecs
->remove_breakpoints_on_following_step
)
3162 ecs
->remove_breakpoints_on_following_step
= 0;
3163 remove_breakpoints ();
3164 breakpoints_inserted
= 0;
3166 else if (!breakpoints_inserted
&&
3167 (through_sigtramp_breakpoint
!= NULL
|| !ecs
->another_trap
))
3169 breakpoints_failed
= insert_breakpoints ();
3170 if (breakpoints_failed
)
3172 stop_stepping (ecs
);
3175 breakpoints_inserted
= 1;
3178 trap_expected
= ecs
->another_trap
;
3180 /* Do not deliver SIGNAL_TRAP (except when the user explicitly
3181 specifies that such a signal should be delivered to the
3184 Typically, this would occure when a user is debugging a
3185 target monitor on a simulator: the target monitor sets a
3186 breakpoint; the simulator encounters this break-point and
3187 halts the simulation handing control to GDB; GDB, noteing
3188 that the break-point isn't valid, returns control back to the
3189 simulator; the simulator then delivers the hardware
3190 equivalent of a SIGNAL_TRAP to the program being debugged. */
3192 if (stop_signal
== TARGET_SIGNAL_TRAP
3193 && !signal_program
[stop_signal
])
3194 stop_signal
= TARGET_SIGNAL_0
;
3196 #ifdef SHIFT_INST_REGS
3197 /* I'm not sure when this following segment applies. I do know,
3198 now, that we shouldn't rewrite the regs when we were stopped
3199 by a random signal from the inferior process. */
3200 /* FIXME: Shouldn't this be based on the valid bit of the SXIP?
3201 (this is only used on the 88k). */
3203 if (!bpstat_explains_signal (stop_bpstat
)
3204 && (stop_signal
!= TARGET_SIGNAL_CHLD
)
3205 && !stopped_by_random_signal
)
3207 #endif /* SHIFT_INST_REGS */
3209 resume (currently_stepping (ecs
), stop_signal
);
3212 prepare_to_wait (ecs
);
3215 /* This function normally comes after a resume, before
3216 handle_inferior_event exits. It takes care of any last bits of
3217 housekeeping, and sets the all-important wait_some_more flag. */
3220 prepare_to_wait (struct execution_control_state
*ecs
)
3222 if (ecs
->infwait_state
== infwait_normal_state
)
3224 overlay_cache_invalid
= 1;
3226 /* We have to invalidate the registers BEFORE calling
3227 target_wait because they can be loaded from the target while
3228 in target_wait. This makes remote debugging a bit more
3229 efficient for those targets that provide critical registers
3230 as part of their normal status mechanism. */
3232 registers_changed ();
3233 ecs
->waiton_ptid
= pid_to_ptid (-1);
3234 ecs
->wp
= &(ecs
->ws
);
3236 /* This is the old end of the while loop. Let everybody know we
3237 want to wait for the inferior some more and get called again
3239 ecs
->wait_some_more
= 1;
3242 /* Print why the inferior has stopped. We always print something when
3243 the inferior exits, or receives a signal. The rest of the cases are
3244 dealt with later on in normal_stop() and print_it_typical(). Ideally
3245 there should be a call to this function from handle_inferior_event()
3246 each time stop_stepping() is called.*/
3248 print_stop_reason (enum inferior_stop_reason stop_reason
, int stop_info
)
3250 switch (stop_reason
)
3253 /* We don't deal with these cases from handle_inferior_event()
3256 case END_STEPPING_RANGE
:
3257 /* We are done with a step/next/si/ni command. */
3258 /* For now print nothing. */
3260 /* Print a message only if not in the middle of doing a "step n"
3261 operation for n > 1 */
3262 if (!step_multi
|| !stop_step
)
3263 if (interpreter_p
&& strncmp (interpreter_p
, "mi", 2) == 0)
3264 ui_out_field_string (uiout
, "reason", "end-stepping-range");
3267 case BREAKPOINT_HIT
:
3268 /* We found a breakpoint. */
3269 /* For now print nothing. */
3272 /* The inferior was terminated by a signal. */
3274 annotate_signalled ();
3275 if (interpreter_p
&& strncmp (interpreter_p
, "mi", 2) == 0)
3276 ui_out_field_string (uiout
, "reason", "exited-signalled");
3277 ui_out_text (uiout
, "\nProgram terminated with signal ");
3278 annotate_signal_name ();
3279 ui_out_field_string (uiout
, "signal-name", target_signal_to_name (stop_info
));
3280 annotate_signal_name_end ();
3281 ui_out_text (uiout
, ", ");
3282 annotate_signal_string ();
3283 ui_out_field_string (uiout
, "signal-meaning", target_signal_to_string (stop_info
));
3284 annotate_signal_string_end ();
3285 ui_out_text (uiout
, ".\n");
3286 ui_out_text (uiout
, "The program no longer exists.\n");
3288 annotate_signalled ();
3289 printf_filtered ("\nProgram terminated with signal ");
3290 annotate_signal_name ();
3291 printf_filtered ("%s", target_signal_to_name (stop_info
));
3292 annotate_signal_name_end ();
3293 printf_filtered (", ");
3294 annotate_signal_string ();
3295 printf_filtered ("%s", target_signal_to_string (stop_info
));
3296 annotate_signal_string_end ();
3297 printf_filtered (".\n");
3299 printf_filtered ("The program no longer exists.\n");
3300 gdb_flush (gdb_stdout
);
3304 /* The inferior program is finished. */
3306 annotate_exited (stop_info
);
3309 if (interpreter_p
&& strncmp (interpreter_p
, "mi", 2) == 0)
3310 ui_out_field_string (uiout
, "reason", "exited");
3311 ui_out_text (uiout
, "\nProgram exited with code ");
3312 ui_out_field_fmt (uiout
, "exit-code", "0%o", (unsigned int) stop_info
);
3313 ui_out_text (uiout
, ".\n");
3317 if (interpreter_p
&& strncmp (interpreter_p
, "mi", 2) == 0)
3318 ui_out_field_string (uiout
, "reason", "exited-normally");
3319 ui_out_text (uiout
, "\nProgram exited normally.\n");
3322 annotate_exited (stop_info
);
3324 printf_filtered ("\nProgram exited with code 0%o.\n",
3325 (unsigned int) stop_info
);
3327 printf_filtered ("\nProgram exited normally.\n");
3330 case SIGNAL_RECEIVED
:
3331 /* Signal received. The signal table tells us to print about
3335 ui_out_text (uiout
, "\nProgram received signal ");
3336 annotate_signal_name ();
3337 ui_out_field_string (uiout
, "signal-name", target_signal_to_name (stop_info
));
3338 annotate_signal_name_end ();
3339 ui_out_text (uiout
, ", ");
3340 annotate_signal_string ();
3341 ui_out_field_string (uiout
, "signal-meaning", target_signal_to_string (stop_info
));
3342 annotate_signal_string_end ();
3343 ui_out_text (uiout
, ".\n");
3346 printf_filtered ("\nProgram received signal ");
3347 annotate_signal_name ();
3348 printf_filtered ("%s", target_signal_to_name (stop_info
));
3349 annotate_signal_name_end ();
3350 printf_filtered (", ");
3351 annotate_signal_string ();
3352 printf_filtered ("%s", target_signal_to_string (stop_info
));
3353 annotate_signal_string_end ();
3354 printf_filtered (".\n");
3355 gdb_flush (gdb_stdout
);
3359 internal_error (__FILE__
, __LINE__
,
3360 "print_stop_reason: unrecognized enum value");
3366 /* Here to return control to GDB when the inferior stops for real.
3367 Print appropriate messages, remove breakpoints, give terminal our modes.
3369 STOP_PRINT_FRAME nonzero means print the executing frame
3370 (pc, function, args, file, line number and line text).
3371 BREAKPOINTS_FAILED nonzero means stop was due to error
3372 attempting to insert breakpoints. */
3377 /* As with the notification of thread events, we want to delay
3378 notifying the user that we've switched thread context until
3379 the inferior actually stops.
3381 (Note that there's no point in saying anything if the inferior
3383 if (! ptid_equal (previous_inferior_ptid
, inferior_ptid
)
3384 && target_has_execution
)
3386 target_terminal_ours_for_output ();
3387 printf_filtered ("[Switching to %s]\n",
3388 target_pid_or_tid_to_str (inferior_ptid
));
3389 previous_inferior_ptid
= inferior_ptid
;
3392 /* Make sure that the current_frame's pc is correct. This
3393 is a correction for setting up the frame info before doing
3394 DECR_PC_AFTER_BREAK */
3395 if (target_has_execution
&& get_current_frame ())
3396 (get_current_frame ())->pc
= read_pc ();
3398 if (breakpoints_failed
)
3400 target_terminal_ours_for_output ();
3401 print_sys_errmsg ("While inserting breakpoints", breakpoints_failed
);
3402 printf_filtered ("Stopped; cannot insert breakpoints.\n\
3403 The same program may be running in another process,\n\
3404 or you may have requested too many hardware breakpoints\n\
3405 and/or watchpoints.\n");
3408 if (target_has_execution
&& breakpoints_inserted
)
3410 if (remove_breakpoints ())
3412 target_terminal_ours_for_output ();
3413 printf_filtered ("Cannot remove breakpoints because ");
3414 printf_filtered ("program is no longer writable.\n");
3415 printf_filtered ("It might be running in another process.\n");
3416 printf_filtered ("Further execution is probably impossible.\n");
3419 breakpoints_inserted
= 0;
3421 /* Delete the breakpoint we stopped at, if it wants to be deleted.
3422 Delete any breakpoint that is to be deleted at the next stop. */
3424 breakpoint_auto_delete (stop_bpstat
);
3426 /* If an auto-display called a function and that got a signal,
3427 delete that auto-display to avoid an infinite recursion. */
3429 if (stopped_by_random_signal
)
3430 disable_current_display ();
3432 /* Don't print a message if in the middle of doing a "step n"
3433 operation for n > 1 */
3434 if (step_multi
&& stop_step
)
3437 target_terminal_ours ();
3439 /* Look up the hook_stop and run it if it exists. */
3441 if (stop_command
&& stop_command
->hook_pre
)
3443 catch_errors (hook_stop_stub
, stop_command
->hook_pre
,
3444 "Error while running hook_stop:\n", RETURN_MASK_ALL
);
3447 if (!target_has_stack
)
3453 /* Select innermost stack frame - i.e., current frame is frame 0,
3454 and current location is based on that.
3455 Don't do this on return from a stack dummy routine,
3456 or if the program has exited. */
3458 if (!stop_stack_dummy
)
3460 select_frame (get_current_frame (), 0);
3462 /* Print current location without a level number, if
3463 we have changed functions or hit a breakpoint.
3464 Print source line if we have one.
3465 bpstat_print() contains the logic deciding in detail
3466 what to print, based on the event(s) that just occurred. */
3468 if (stop_print_frame
3473 int do_frame_printing
= 1;
3475 bpstat_ret
= bpstat_print (stop_bpstat
);
3480 && step_frame_address
== FRAME_FP (get_current_frame ())
3481 && step_start_function
== find_pc_function (stop_pc
))
3482 source_flag
= SRC_LINE
; /* finished step, just print source line */
3484 source_flag
= SRC_AND_LOC
; /* print location and source line */
3486 case PRINT_SRC_AND_LOC
:
3487 source_flag
= SRC_AND_LOC
; /* print location and source line */
3489 case PRINT_SRC_ONLY
:
3490 source_flag
= SRC_LINE
;
3493 source_flag
= SRC_LINE
; /* something bogus */
3494 do_frame_printing
= 0;
3497 internal_error (__FILE__
, __LINE__
,
3501 /* For mi, have the same behavior every time we stop:
3502 print everything but the source line. */
3503 if (interpreter_p
&& strncmp (interpreter_p
, "mi", 2) == 0)
3504 source_flag
= LOC_AND_ADDRESS
;
3508 if (interpreter_p
&& strncmp (interpreter_p
, "mi", 2) == 0)
3509 ui_out_field_int (uiout
, "thread-id",
3510 pid_to_thread_id (inferior_ptid
));
3512 /* The behavior of this routine with respect to the source
3514 SRC_LINE: Print only source line
3515 LOCATION: Print only location
3516 SRC_AND_LOC: Print location and source line */
3517 if (do_frame_printing
)
3518 show_and_print_stack_frame (selected_frame
, -1, source_flag
);
3520 /* Display the auto-display expressions. */
3525 /* Save the function value return registers, if we care.
3526 We might be about to restore their previous contents. */
3527 if (proceed_to_finish
)
3528 read_register_bytes (0, stop_registers
, REGISTER_BYTES
);
3530 if (stop_stack_dummy
)
3532 /* Pop the empty frame that contains the stack dummy.
3533 POP_FRAME ends with a setting of the current frame, so we
3534 can use that next. */
3536 /* Set stop_pc to what it was before we called the function.
3537 Can't rely on restore_inferior_status because that only gets
3538 called if we don't stop in the called function. */
3539 stop_pc
= read_pc ();
3540 select_frame (get_current_frame (), 0);
3544 TUIDO (((TuiOpaqueFuncPtr
) tui_vCheckDataValues
, selected_frame
));
3547 annotate_stopped ();
3551 hook_stop_stub (void *cmd
)
3553 execute_user_command ((struct cmd_list_element
*) cmd
, 0);
3558 signal_stop_state (int signo
)
3560 return signal_stop
[signo
];
3564 signal_print_state (int signo
)
3566 return signal_print
[signo
];
3570 signal_pass_state (int signo
)
3572 return signal_program
[signo
];
3575 int signal_stop_update (signo
, state
)
3579 int ret
= signal_stop
[signo
];
3580 signal_stop
[signo
] = state
;
3584 int signal_print_update (signo
, state
)
3588 int ret
= signal_print
[signo
];
3589 signal_print
[signo
] = state
;
3593 int signal_pass_update (signo
, state
)
3597 int ret
= signal_program
[signo
];
3598 signal_program
[signo
] = state
;
3603 sig_print_header (void)
3606 Signal Stop\tPrint\tPass to program\tDescription\n");
3610 sig_print_info (enum target_signal oursig
)
3612 char *name
= target_signal_to_name (oursig
);
3613 int name_padding
= 13 - strlen (name
);
3615 if (name_padding
<= 0)
3618 printf_filtered ("%s", name
);
3619 printf_filtered ("%*.*s ", name_padding
, name_padding
,
3621 printf_filtered ("%s\t", signal_stop
[oursig
] ? "Yes" : "No");
3622 printf_filtered ("%s\t", signal_print
[oursig
] ? "Yes" : "No");
3623 printf_filtered ("%s\t\t", signal_program
[oursig
] ? "Yes" : "No");
3624 printf_filtered ("%s\n", target_signal_to_string (oursig
));
3627 /* Specify how various signals in the inferior should be handled. */
3630 handle_command (char *args
, int from_tty
)
3633 int digits
, wordlen
;
3634 int sigfirst
, signum
, siglast
;
3635 enum target_signal oursig
;
3638 unsigned char *sigs
;
3639 struct cleanup
*old_chain
;
3643 error_no_arg ("signal to handle");
3646 /* Allocate and zero an array of flags for which signals to handle. */
3648 nsigs
= (int) TARGET_SIGNAL_LAST
;
3649 sigs
= (unsigned char *) alloca (nsigs
);
3650 memset (sigs
, 0, nsigs
);
3652 /* Break the command line up into args. */
3654 argv
= buildargv (args
);
3659 old_chain
= make_cleanup_freeargv (argv
);
3661 /* Walk through the args, looking for signal oursigs, signal names, and
3662 actions. Signal numbers and signal names may be interspersed with
3663 actions, with the actions being performed for all signals cumulatively
3664 specified. Signal ranges can be specified as <LOW>-<HIGH>. */
3666 while (*argv
!= NULL
)
3668 wordlen
= strlen (*argv
);
3669 for (digits
= 0; isdigit ((*argv
)[digits
]); digits
++)
3673 sigfirst
= siglast
= -1;
3675 if (wordlen
>= 1 && !strncmp (*argv
, "all", wordlen
))
3677 /* Apply action to all signals except those used by the
3678 debugger. Silently skip those. */
3681 siglast
= nsigs
- 1;
3683 else if (wordlen
>= 1 && !strncmp (*argv
, "stop", wordlen
))
3685 SET_SIGS (nsigs
, sigs
, signal_stop
);
3686 SET_SIGS (nsigs
, sigs
, signal_print
);
3688 else if (wordlen
>= 1 && !strncmp (*argv
, "ignore", wordlen
))
3690 UNSET_SIGS (nsigs
, sigs
, signal_program
);
3692 else if (wordlen
>= 2 && !strncmp (*argv
, "print", wordlen
))
3694 SET_SIGS (nsigs
, sigs
, signal_print
);
3696 else if (wordlen
>= 2 && !strncmp (*argv
, "pass", wordlen
))
3698 SET_SIGS (nsigs
, sigs
, signal_program
);
3700 else if (wordlen
>= 3 && !strncmp (*argv
, "nostop", wordlen
))
3702 UNSET_SIGS (nsigs
, sigs
, signal_stop
);
3704 else if (wordlen
>= 3 && !strncmp (*argv
, "noignore", wordlen
))
3706 SET_SIGS (nsigs
, sigs
, signal_program
);
3708 else if (wordlen
>= 4 && !strncmp (*argv
, "noprint", wordlen
))
3710 UNSET_SIGS (nsigs
, sigs
, signal_print
);
3711 UNSET_SIGS (nsigs
, sigs
, signal_stop
);
3713 else if (wordlen
>= 4 && !strncmp (*argv
, "nopass", wordlen
))
3715 UNSET_SIGS (nsigs
, sigs
, signal_program
);
3717 else if (digits
> 0)
3719 /* It is numeric. The numeric signal refers to our own
3720 internal signal numbering from target.h, not to host/target
3721 signal number. This is a feature; users really should be
3722 using symbolic names anyway, and the common ones like
3723 SIGHUP, SIGINT, SIGALRM, etc. will work right anyway. */
3725 sigfirst
= siglast
= (int)
3726 target_signal_from_command (atoi (*argv
));
3727 if ((*argv
)[digits
] == '-')
3730 target_signal_from_command (atoi ((*argv
) + digits
+ 1));
3732 if (sigfirst
> siglast
)
3734 /* Bet he didn't figure we'd think of this case... */
3742 oursig
= target_signal_from_name (*argv
);
3743 if (oursig
!= TARGET_SIGNAL_UNKNOWN
)
3745 sigfirst
= siglast
= (int) oursig
;
3749 /* Not a number and not a recognized flag word => complain. */
3750 error ("Unrecognized or ambiguous flag word: \"%s\".", *argv
);
3754 /* If any signal numbers or symbol names were found, set flags for
3755 which signals to apply actions to. */
3757 for (signum
= sigfirst
; signum
>= 0 && signum
<= siglast
; signum
++)
3759 switch ((enum target_signal
) signum
)
3761 case TARGET_SIGNAL_TRAP
:
3762 case TARGET_SIGNAL_INT
:
3763 if (!allsigs
&& !sigs
[signum
])
3765 if (query ("%s is used by the debugger.\n\
3766 Are you sure you want to change it? ",
3767 target_signal_to_name
3768 ((enum target_signal
) signum
)))
3774 printf_unfiltered ("Not confirmed, unchanged.\n");
3775 gdb_flush (gdb_stdout
);
3779 case TARGET_SIGNAL_0
:
3780 case TARGET_SIGNAL_DEFAULT
:
3781 case TARGET_SIGNAL_UNKNOWN
:
3782 /* Make sure that "all" doesn't print these. */
3793 target_notice_signals (inferior_ptid
);
3797 /* Show the results. */
3798 sig_print_header ();
3799 for (signum
= 0; signum
< nsigs
; signum
++)
3803 sig_print_info (signum
);
3808 do_cleanups (old_chain
);
3812 xdb_handle_command (char *args
, int from_tty
)
3815 struct cleanup
*old_chain
;
3817 /* Break the command line up into args. */
3819 argv
= buildargv (args
);
3824 old_chain
= make_cleanup_freeargv (argv
);
3825 if (argv
[1] != (char *) NULL
)
3830 bufLen
= strlen (argv
[0]) + 20;
3831 argBuf
= (char *) xmalloc (bufLen
);
3835 enum target_signal oursig
;
3837 oursig
= target_signal_from_name (argv
[0]);
3838 memset (argBuf
, 0, bufLen
);
3839 if (strcmp (argv
[1], "Q") == 0)
3840 sprintf (argBuf
, "%s %s", argv
[0], "noprint");
3843 if (strcmp (argv
[1], "s") == 0)
3845 if (!signal_stop
[oursig
])
3846 sprintf (argBuf
, "%s %s", argv
[0], "stop");
3848 sprintf (argBuf
, "%s %s", argv
[0], "nostop");
3850 else if (strcmp (argv
[1], "i") == 0)
3852 if (!signal_program
[oursig
])
3853 sprintf (argBuf
, "%s %s", argv
[0], "pass");
3855 sprintf (argBuf
, "%s %s", argv
[0], "nopass");
3857 else if (strcmp (argv
[1], "r") == 0)
3859 if (!signal_print
[oursig
])
3860 sprintf (argBuf
, "%s %s", argv
[0], "print");
3862 sprintf (argBuf
, "%s %s", argv
[0], "noprint");
3868 handle_command (argBuf
, from_tty
);
3870 printf_filtered ("Invalid signal handling flag.\n");
3875 do_cleanups (old_chain
);
3878 /* Print current contents of the tables set by the handle command.
3879 It is possible we should just be printing signals actually used
3880 by the current target (but for things to work right when switching
3881 targets, all signals should be in the signal tables). */
3884 signals_info (char *signum_exp
, int from_tty
)
3886 enum target_signal oursig
;
3887 sig_print_header ();
3891 /* First see if this is a symbol name. */
3892 oursig
= target_signal_from_name (signum_exp
);
3893 if (oursig
== TARGET_SIGNAL_UNKNOWN
)
3895 /* No, try numeric. */
3897 target_signal_from_command (parse_and_eval_long (signum_exp
));
3899 sig_print_info (oursig
);
3903 printf_filtered ("\n");
3904 /* These ugly casts brought to you by the native VAX compiler. */
3905 for (oursig
= TARGET_SIGNAL_FIRST
;
3906 (int) oursig
< (int) TARGET_SIGNAL_LAST
;
3907 oursig
= (enum target_signal
) ((int) oursig
+ 1))
3911 if (oursig
!= TARGET_SIGNAL_UNKNOWN
3912 && oursig
!= TARGET_SIGNAL_DEFAULT
3913 && oursig
!= TARGET_SIGNAL_0
)
3914 sig_print_info (oursig
);
3917 printf_filtered ("\nUse the \"handle\" command to change these tables.\n");
3920 struct inferior_status
3922 enum target_signal stop_signal
;
3926 int stop_stack_dummy
;
3927 int stopped_by_random_signal
;
3929 CORE_ADDR step_range_start
;
3930 CORE_ADDR step_range_end
;
3931 CORE_ADDR step_frame_address
;
3932 enum step_over_calls_kind step_over_calls
;
3933 CORE_ADDR step_resume_break_address
;
3934 int stop_after_trap
;
3935 int stop_soon_quietly
;
3936 CORE_ADDR selected_frame_address
;
3937 char *stop_registers
;
3939 /* These are here because if call_function_by_hand has written some
3940 registers and then decides to call error(), we better not have changed
3945 int breakpoint_proceeded
;
3946 int restore_stack_info
;
3947 int proceed_to_finish
;
3950 static struct inferior_status
*
3951 xmalloc_inferior_status (void)
3953 struct inferior_status
*inf_status
;
3954 inf_status
= xmalloc (sizeof (struct inferior_status
));
3955 inf_status
->stop_registers
= xmalloc (REGISTER_BYTES
);
3956 inf_status
->registers
= xmalloc (REGISTER_BYTES
);
3961 free_inferior_status (struct inferior_status
*inf_status
)
3963 xfree (inf_status
->registers
);
3964 xfree (inf_status
->stop_registers
);
3969 write_inferior_status_register (struct inferior_status
*inf_status
, int regno
,
3972 int size
= REGISTER_RAW_SIZE (regno
);
3973 void *buf
= alloca (size
);
3974 store_signed_integer (buf
, size
, val
);
3975 memcpy (&inf_status
->registers
[REGISTER_BYTE (regno
)], buf
, size
);
3978 /* Save all of the information associated with the inferior<==>gdb
3979 connection. INF_STATUS is a pointer to a "struct inferior_status"
3980 (defined in inferior.h). */
3982 struct inferior_status
*
3983 save_inferior_status (int restore_stack_info
)
3985 struct inferior_status
*inf_status
= xmalloc_inferior_status ();
3987 inf_status
->stop_signal
= stop_signal
;
3988 inf_status
->stop_pc
= stop_pc
;
3989 inf_status
->stop_step
= stop_step
;
3990 inf_status
->stop_stack_dummy
= stop_stack_dummy
;
3991 inf_status
->stopped_by_random_signal
= stopped_by_random_signal
;
3992 inf_status
->trap_expected
= trap_expected
;
3993 inf_status
->step_range_start
= step_range_start
;
3994 inf_status
->step_range_end
= step_range_end
;
3995 inf_status
->step_frame_address
= step_frame_address
;
3996 inf_status
->step_over_calls
= step_over_calls
;
3997 inf_status
->stop_after_trap
= stop_after_trap
;
3998 inf_status
->stop_soon_quietly
= stop_soon_quietly
;
3999 /* Save original bpstat chain here; replace it with copy of chain.
4000 If caller's caller is walking the chain, they'll be happier if we
4001 hand them back the original chain when restore_inferior_status is
4003 inf_status
->stop_bpstat
= stop_bpstat
;
4004 stop_bpstat
= bpstat_copy (stop_bpstat
);
4005 inf_status
->breakpoint_proceeded
= breakpoint_proceeded
;
4006 inf_status
->restore_stack_info
= restore_stack_info
;
4007 inf_status
->proceed_to_finish
= proceed_to_finish
;
4009 memcpy (inf_status
->stop_registers
, stop_registers
, REGISTER_BYTES
);
4011 read_register_bytes (0, inf_status
->registers
, REGISTER_BYTES
);
4013 record_selected_frame (&(inf_status
->selected_frame_address
),
4014 &(inf_status
->selected_level
));
4018 struct restore_selected_frame_args
4020 CORE_ADDR frame_address
;
4025 restore_selected_frame (void *args
)
4027 struct restore_selected_frame_args
*fr
=
4028 (struct restore_selected_frame_args
*) args
;
4029 struct frame_info
*frame
;
4030 int level
= fr
->level
;
4032 frame
= find_relative_frame (get_current_frame (), &level
);
4034 /* If inf_status->selected_frame_address is NULL, there was no
4035 previously selected frame. */
4036 if (frame
== NULL
||
4037 /* FRAME_FP (frame) != fr->frame_address || */
4038 /* elz: deleted this check as a quick fix to the problem that
4039 for function called by hand gdb creates no internal frame
4040 structure and the real stack and gdb's idea of stack are
4041 different if nested calls by hands are made.
4043 mvs: this worries me. */
4046 warning ("Unable to restore previously selected frame.\n");
4050 select_frame (frame
, fr
->level
);
4056 restore_inferior_status (struct inferior_status
*inf_status
)
4058 stop_signal
= inf_status
->stop_signal
;
4059 stop_pc
= inf_status
->stop_pc
;
4060 stop_step
= inf_status
->stop_step
;
4061 stop_stack_dummy
= inf_status
->stop_stack_dummy
;
4062 stopped_by_random_signal
= inf_status
->stopped_by_random_signal
;
4063 trap_expected
= inf_status
->trap_expected
;
4064 step_range_start
= inf_status
->step_range_start
;
4065 step_range_end
= inf_status
->step_range_end
;
4066 step_frame_address
= inf_status
->step_frame_address
;
4067 step_over_calls
= inf_status
->step_over_calls
;
4068 stop_after_trap
= inf_status
->stop_after_trap
;
4069 stop_soon_quietly
= inf_status
->stop_soon_quietly
;
4070 bpstat_clear (&stop_bpstat
);
4071 stop_bpstat
= inf_status
->stop_bpstat
;
4072 breakpoint_proceeded
= inf_status
->breakpoint_proceeded
;
4073 proceed_to_finish
= inf_status
->proceed_to_finish
;
4075 /* FIXME: Is the restore of stop_registers always needed */
4076 memcpy (stop_registers
, inf_status
->stop_registers
, REGISTER_BYTES
);
4078 /* The inferior can be gone if the user types "print exit(0)"
4079 (and perhaps other times). */
4080 if (target_has_execution
)
4081 write_register_bytes (0, inf_status
->registers
, REGISTER_BYTES
);
4083 /* FIXME: If we are being called after stopping in a function which
4084 is called from gdb, we should not be trying to restore the
4085 selected frame; it just prints a spurious error message (The
4086 message is useful, however, in detecting bugs in gdb (like if gdb
4087 clobbers the stack)). In fact, should we be restoring the
4088 inferior status at all in that case? . */
4090 if (target_has_stack
&& inf_status
->restore_stack_info
)
4092 struct restore_selected_frame_args fr
;
4093 fr
.level
= inf_status
->selected_level
;
4094 fr
.frame_address
= inf_status
->selected_frame_address
;
4095 /* The point of catch_errors is that if the stack is clobbered,
4096 walking the stack might encounter a garbage pointer and error()
4097 trying to dereference it. */
4098 if (catch_errors (restore_selected_frame
, &fr
,
4099 "Unable to restore previously selected frame:\n",
4100 RETURN_MASK_ERROR
) == 0)
4101 /* Error in restoring the selected frame. Select the innermost
4105 select_frame (get_current_frame (), 0);
4109 free_inferior_status (inf_status
);
4113 do_restore_inferior_status_cleanup (void *sts
)
4115 restore_inferior_status (sts
);
4119 make_cleanup_restore_inferior_status (struct inferior_status
*inf_status
)
4121 return make_cleanup (do_restore_inferior_status_cleanup
, inf_status
);
4125 discard_inferior_status (struct inferior_status
*inf_status
)
4127 /* See save_inferior_status for info on stop_bpstat. */
4128 bpstat_clear (&inf_status
->stop_bpstat
);
4129 free_inferior_status (inf_status
);
4132 /* Oft used ptids */
4134 ptid_t minus_one_ptid
;
4136 /* Create a ptid given the necessary PID, LWP, and TID components. */
4139 ptid_build (int pid
, long lwp
, long tid
)
4149 /* Create a ptid from just a pid. */
4152 pid_to_ptid (int pid
)
4154 return ptid_build (pid
, 0, 0);
4157 /* Fetch the pid (process id) component from a ptid. */
4160 ptid_get_pid (ptid_t ptid
)
4165 /* Fetch the lwp (lightweight process) component from a ptid. */
4168 ptid_get_lwp (ptid_t ptid
)
4173 /* Fetch the tid (thread id) component from a ptid. */
4176 ptid_get_tid (ptid_t ptid
)
4181 /* ptid_equal() is used to test equality of two ptids. */
4184 ptid_equal (ptid_t ptid1
, ptid_t ptid2
)
4186 return (ptid1
.pid
== ptid2
.pid
&& ptid1
.lwp
== ptid2
.lwp
4187 && ptid1
.tid
== ptid2
.tid
);
4190 /* restore_inferior_ptid() will be used by the cleanup machinery
4191 to restore the inferior_ptid value saved in a call to
4192 save_inferior_ptid(). */
4195 restore_inferior_ptid (void *arg
)
4197 ptid_t
*saved_ptid_ptr
= arg
;
4198 inferior_ptid
= *saved_ptid_ptr
;
4202 /* Save the value of inferior_ptid so that it may be restored by a
4203 later call to do_cleanups(). Returns the struct cleanup pointer
4204 needed for later doing the cleanup. */
4207 save_inferior_ptid (void)
4209 ptid_t
*saved_ptid_ptr
;
4211 saved_ptid_ptr
= xmalloc (sizeof (ptid_t
));
4212 *saved_ptid_ptr
= inferior_ptid
;
4213 return make_cleanup (restore_inferior_ptid
, saved_ptid_ptr
);
4220 stop_registers
= xmalloc (REGISTER_BYTES
);
4224 _initialize_infrun (void)
4227 register int numsigs
;
4228 struct cmd_list_element
*c
;
4232 register_gdbarch_swap (&stop_registers
, sizeof (stop_registers
), NULL
);
4233 register_gdbarch_swap (NULL
, 0, build_infrun
);
4235 add_info ("signals", signals_info
,
4236 "What debugger does when program gets various signals.\n\
4237 Specify a signal as argument to print info on that signal only.");
4238 add_info_alias ("handle", "signals", 0);
4240 add_com ("handle", class_run
, handle_command
,
4241 concat ("Specify how to handle a signal.\n\
4242 Args are signals and actions to apply to those signals.\n\
4243 Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\
4244 from 1-15 are allowed for compatibility with old versions of GDB.\n\
4245 Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\
4246 The special arg \"all\" is recognized to mean all signals except those\n\
4247 used by the debugger, typically SIGTRAP and SIGINT.\n",
4248 "Recognized actions include \"stop\", \"nostop\", \"print\", \"noprint\",\n\
4249 \"pass\", \"nopass\", \"ignore\", or \"noignore\".\n\
4250 Stop means reenter debugger if this signal happens (implies print).\n\
4251 Print means print a message if this signal happens.\n\
4252 Pass means let program see this signal; otherwise program doesn't know.\n\
4253 Ignore is a synonym for nopass and noignore is a synonym for pass.\n\
4254 Pass and Stop may be combined.", NULL
));
4257 add_com ("lz", class_info
, signals_info
,
4258 "What debugger does when program gets various signals.\n\
4259 Specify a signal as argument to print info on that signal only.");
4260 add_com ("z", class_run
, xdb_handle_command
,
4261 concat ("Specify how to handle a signal.\n\
4262 Args are signals and actions to apply to those signals.\n\
4263 Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\
4264 from 1-15 are allowed for compatibility with old versions of GDB.\n\
4265 Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\
4266 The special arg \"all\" is recognized to mean all signals except those\n\
4267 used by the debugger, typically SIGTRAP and SIGINT.\n",
4268 "Recognized actions include \"s\" (toggles between stop and nostop), \n\
4269 \"r\" (toggles between print and noprint), \"i\" (toggles between pass and \
4270 nopass), \"Q\" (noprint)\n\
4271 Stop means reenter debugger if this signal happens (implies print).\n\
4272 Print means print a message if this signal happens.\n\
4273 Pass means let program see this signal; otherwise program doesn't know.\n\
4274 Ignore is a synonym for nopass and noignore is a synonym for pass.\n\
4275 Pass and Stop may be combined.", NULL
));
4279 stop_command
= add_cmd ("stop", class_obscure
, not_just_help_class_command
,
4280 "There is no `stop' command, but you can set a hook on `stop'.\n\
4281 This allows you to set a list of commands to be run each time execution\n\
4282 of the program stops.", &cmdlist
);
4284 numsigs
= (int) TARGET_SIGNAL_LAST
;
4285 signal_stop
= (unsigned char *)
4286 xmalloc (sizeof (signal_stop
[0]) * numsigs
);
4287 signal_print
= (unsigned char *)
4288 xmalloc (sizeof (signal_print
[0]) * numsigs
);
4289 signal_program
= (unsigned char *)
4290 xmalloc (sizeof (signal_program
[0]) * numsigs
);
4291 for (i
= 0; i
< numsigs
; i
++)
4294 signal_print
[i
] = 1;
4295 signal_program
[i
] = 1;
4298 /* Signals caused by debugger's own actions
4299 should not be given to the program afterwards. */
4300 signal_program
[TARGET_SIGNAL_TRAP
] = 0;
4301 signal_program
[TARGET_SIGNAL_INT
] = 0;
4303 /* Signals that are not errors should not normally enter the debugger. */
4304 signal_stop
[TARGET_SIGNAL_ALRM
] = 0;
4305 signal_print
[TARGET_SIGNAL_ALRM
] = 0;
4306 signal_stop
[TARGET_SIGNAL_VTALRM
] = 0;
4307 signal_print
[TARGET_SIGNAL_VTALRM
] = 0;
4308 signal_stop
[TARGET_SIGNAL_PROF
] = 0;
4309 signal_print
[TARGET_SIGNAL_PROF
] = 0;
4310 signal_stop
[TARGET_SIGNAL_CHLD
] = 0;
4311 signal_print
[TARGET_SIGNAL_CHLD
] = 0;
4312 signal_stop
[TARGET_SIGNAL_IO
] = 0;
4313 signal_print
[TARGET_SIGNAL_IO
] = 0;
4314 signal_stop
[TARGET_SIGNAL_POLL
] = 0;
4315 signal_print
[TARGET_SIGNAL_POLL
] = 0;
4316 signal_stop
[TARGET_SIGNAL_URG
] = 0;
4317 signal_print
[TARGET_SIGNAL_URG
] = 0;
4318 signal_stop
[TARGET_SIGNAL_WINCH
] = 0;
4319 signal_print
[TARGET_SIGNAL_WINCH
] = 0;
4321 /* These signals are used internally by user-level thread
4322 implementations. (See signal(5) on Solaris.) Like the above
4323 signals, a healthy program receives and handles them as part of
4324 its normal operation. */
4325 signal_stop
[TARGET_SIGNAL_LWP
] = 0;
4326 signal_print
[TARGET_SIGNAL_LWP
] = 0;
4327 signal_stop
[TARGET_SIGNAL_WAITING
] = 0;
4328 signal_print
[TARGET_SIGNAL_WAITING
] = 0;
4329 signal_stop
[TARGET_SIGNAL_CANCEL
] = 0;
4330 signal_print
[TARGET_SIGNAL_CANCEL
] = 0;
4334 (add_set_cmd ("stop-on-solib-events", class_support
, var_zinteger
,
4335 (char *) &stop_on_solib_events
,
4336 "Set stopping for shared library events.\n\
4337 If nonzero, gdb will give control to the user when the dynamic linker\n\
4338 notifies gdb of shared library events. The most common event of interest\n\
4339 to the user would be loading/unloading of a new library.\n",
4344 c
= add_set_enum_cmd ("follow-fork-mode",
4346 follow_fork_mode_kind_names
,
4347 &follow_fork_mode_string
,
4348 /* ??rehrauer: The "both" option is broken, by what may be a 10.20
4349 kernel problem. It's also not terribly useful without a GUI to
4350 help the user drive two debuggers. So for now, I'm disabling
4351 the "both" option. */
4352 /* "Set debugger response to a program call of fork \
4354 A fork or vfork creates a new process. follow-fork-mode can be:\n\
4355 parent - the original process is debugged after a fork\n\
4356 child - the new process is debugged after a fork\n\
4357 both - both the parent and child are debugged after a fork\n\
4358 ask - the debugger will ask for one of the above choices\n\
4359 For \"both\", another copy of the debugger will be started to follow\n\
4360 the new child process. The original debugger will continue to follow\n\
4361 the original parent process. To distinguish their prompts, the\n\
4362 debugger copy's prompt will be changed.\n\
4363 For \"parent\" or \"child\", the unfollowed process will run free.\n\
4364 By default, the debugger will follow the parent process.",
4366 "Set debugger response to a program call of fork \
4368 A fork or vfork creates a new process. follow-fork-mode can be:\n\
4369 parent - the original process is debugged after a fork\n\
4370 child - the new process is debugged after a fork\n\
4371 ask - the debugger will ask for one of the above choices\n\
4372 For \"parent\" or \"child\", the unfollowed process will run free.\n\
4373 By default, the debugger will follow the parent process.",
4375 /* c->function.sfunc = ; */
4376 add_show_from_set (c
, &showlist
);
4378 c
= add_set_enum_cmd ("scheduler-locking", class_run
,
4379 scheduler_enums
, /* array of string names */
4380 &scheduler_mode
, /* current mode */
4381 "Set mode for locking scheduler during execution.\n\
4382 off == no locking (threads may preempt at any time)\n\
4383 on == full locking (no thread except the current thread may run)\n\
4384 step == scheduler locked during every single-step operation.\n\
4385 In this mode, no other thread may run during a step command.\n\
4386 Other threads may run while stepping over a function call ('next').",
4389 c
->function
.sfunc
= set_schedlock_func
; /* traps on target vector */
4390 add_show_from_set (c
, &showlist
);
4392 c
= add_set_cmd ("step-mode", class_run
,
4393 var_boolean
, (char*) &step_stop_if_no_debug
,
4394 "Set mode of the step operation. When set, doing a step over a\n\
4395 function without debug line information will stop at the first\n\
4396 instruction of that function. Otherwise, the function is skipped and\n\
4397 the step command stops at a different source line.",
4399 add_show_from_set (c
, &showlist
);
4401 /* ptid initializations */
4402 null_ptid
= ptid_build (0, 0, 0);
4403 minus_one_ptid
= ptid_build (-1, 0, 0);
4404 inferior_ptid
= null_ptid
;
4405 target_last_wait_ptid
= minus_one_ptid
;