1 /* Target-struct-independent code to start (run) and stop an inferior process.
2 Copyright 1986-1989, 1991-1999 Free Software Foundation, Inc.
4 This file is part of GDB.
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 59 Temple Place - Suite 330,
19 Boston, MA 02111-1307, USA. */
22 #include "gdb_string.h"
27 #include "breakpoint.h"
32 #include "gdbthread.h"
34 #include "symfile.h" /* for overlay functions */
37 #include "event-loop.h"
39 /* Prototypes for local functions */
41 static void signals_info PARAMS ((char *, int));
43 static void handle_command PARAMS ((char *, int));
45 static void sig_print_info PARAMS ((enum target_signal));
47 static void sig_print_header PARAMS ((void));
49 static void resume_cleanups PARAMS ((int));
51 static int hook_stop_stub PARAMS ((PTR));
53 static void delete_breakpoint_current_contents PARAMS ((PTR));
55 static void set_follow_fork_mode_command PARAMS ((char *arg, int from_tty, struct cmd_list_element * c));
57 static void complete_execution PARAMS ((void));
59 int inferior_ignoring_startup_exec_events = 0;
60 int inferior_ignoring_leading_exec_events = 0;
62 /* In asynchronous mode, but simulating synchronous execution. */
63 int sync_execution = 0;
65 /* wait_for_inferior and normal_stop use this to notify the user
66 when the inferior stopped in a different thread than it had been
68 static int switched_from_inferior_pid;
70 /* This will be true for configurations that may actually report an
71 inferior pid different from the original. At present this is only
72 true for HP-UX native. */
74 #ifndef MAY_SWITCH_FROM_INFERIOR_PID
75 #define MAY_SWITCH_FROM_INFERIOR_PID (0)
78 static int may_switch_from_inferior_pid = MAY_SWITCH_FROM_INFERIOR_PID;
80 /* This is true for configurations that may follow through execl() and
81 similar functions. At present this is only true for HP-UX native. */
83 #ifndef MAY_FOLLOW_EXEC
84 #define MAY_FOLLOW_EXEC (0)
87 static int may_follow_exec = MAY_FOLLOW_EXEC;
89 /* resume and wait_for_inferior use this to ensure that when
90 stepping over a hit breakpoint in a threaded application
91 only the thread that hit the breakpoint is stepped and the
92 other threads don't continue. This prevents having another
93 thread run past the breakpoint while it is temporarily
96 This is not thread-specific, so it isn't saved as part of
99 Versions of gdb which don't use the "step == this thread steps
100 and others continue" model but instead use the "step == this
101 thread steps and others wait" shouldn't do this. */
102 static int thread_step_needed = 0;
104 /* This is true if thread_step_needed should actually be used. At
105 present this is only true for HP-UX native. */
107 #ifndef USE_THREAD_STEP_NEEDED
108 #define USE_THREAD_STEP_NEEDED (0)
111 static int use_thread_step_needed = USE_THREAD_STEP_NEEDED;
113 static void follow_inferior_fork PARAMS ((int parent_pid,
118 static void follow_fork PARAMS ((int parent_pid, int child_pid));
120 static void follow_vfork PARAMS ((int parent_pid, int child_pid));
122 static void set_schedlock_func PARAMS ((char *args, int from_tty,
123 struct cmd_list_element * c));
125 static int is_internal_shlib_eventpoint PARAMS ((struct breakpoint * ep));
127 static int stopped_for_internal_shlib_event PARAMS ((bpstat bs));
129 static int stopped_for_shlib_catchpoint PARAMS ((bpstat bs,
130 struct breakpoint ** cp_p));
133 struct execution_control_state;
135 static int currently_stepping PARAMS ((struct execution_control_state * ecs));
137 static void xdb_handle_command PARAMS ((char *args, int from_tty));
139 void _initialize_infrun PARAMS ((void));
141 /* GET_LONGJMP_TARGET returns the PC at which longjmp() will resume the
142 program. It needs to examine the jmp_buf argument and extract the PC
143 from it. The return value is non-zero on success, zero otherwise. */
145 #ifndef GET_LONGJMP_TARGET
146 #define GET_LONGJMP_TARGET(PC_ADDR) 0
150 /* Some machines have trampoline code that sits between function callers
151 and the actual functions themselves. If this machine doesn't have
152 such things, disable their processing. */
154 #ifndef SKIP_TRAMPOLINE_CODE
155 #define SKIP_TRAMPOLINE_CODE(pc) 0
158 /* Dynamic function trampolines are similar to solib trampolines in that they
159 are between the caller and the callee. The difference is that when you
160 enter a dynamic trampoline, you can't determine the callee's address. Some
161 (usually complex) code needs to run in the dynamic trampoline to figure out
162 the callee's address. This macro is usually called twice. First, when we
163 enter the trampoline (looks like a normal function call at that point). It
164 should return the PC of a point within the trampoline where the callee's
165 address is known. Second, when we hit the breakpoint, this routine returns
166 the callee's address. At that point, things proceed as per a step resume
169 #ifndef DYNAMIC_TRAMPOLINE_NEXTPC
170 #define DYNAMIC_TRAMPOLINE_NEXTPC(pc) 0
173 /* On SVR4 based systems, determining the callee's address is exceedingly
174 difficult and depends on the implementation of the run time loader.
175 If we are stepping at the source level, we single step until we exit
176 the run time loader code and reach the callee's address. */
178 #ifndef IN_SOLIB_DYNSYM_RESOLVE_CODE
179 #define IN_SOLIB_DYNSYM_RESOLVE_CODE(pc) 0
182 /* For SVR4 shared libraries, each call goes through a small piece of
183 trampoline code in the ".plt" section. IN_SOLIB_CALL_TRAMPOLINE evaluates
184 to nonzero if we are current stopped in one of these. */
186 #ifndef IN_SOLIB_CALL_TRAMPOLINE
187 #define IN_SOLIB_CALL_TRAMPOLINE(pc,name) 0
190 /* In some shared library schemes, the return path from a shared library
191 call may need to go through a trampoline too. */
193 #ifndef IN_SOLIB_RETURN_TRAMPOLINE
194 #define IN_SOLIB_RETURN_TRAMPOLINE(pc,name) 0
197 /* This function returns TRUE if pc is the address of an instruction
198 that lies within the dynamic linker (such as the event hook, or the
201 This function must be used only when a dynamic linker event has
202 been caught, and the inferior is being stepped out of the hook, or
203 undefined results are guaranteed. */
205 #ifndef SOLIB_IN_DYNAMIC_LINKER
206 #define SOLIB_IN_DYNAMIC_LINKER(pid,pc) 0
209 /* On MIPS16, a function that returns a floating point value may call
210 a library helper function to copy the return value to a floating point
211 register. The IGNORE_HELPER_CALL macro returns non-zero if we
212 should ignore (i.e. step over) this function call. */
213 #ifndef IGNORE_HELPER_CALL
214 #define IGNORE_HELPER_CALL(pc) 0
217 /* On some systems, the PC may be left pointing at an instruction that won't
218 actually be executed. This is usually indicated by a bit in the PSW. If
219 we find ourselves in such a state, then we step the target beyond the
220 nullified instruction before returning control to the user so as to avoid
223 #ifndef INSTRUCTION_NULLIFIED
224 #define INSTRUCTION_NULLIFIED 0
227 /* Convert the #defines into values. This is temporary until wfi control
228 flow is completely sorted out. */
230 #ifndef HAVE_STEPPABLE_WATCHPOINT
231 #define HAVE_STEPPABLE_WATCHPOINT 0
233 #undef HAVE_STEPPABLE_WATCHPOINT
234 #define HAVE_STEPPABLE_WATCHPOINT 1
237 #ifndef HAVE_NONSTEPPABLE_WATCHPOINT
238 #define HAVE_NONSTEPPABLE_WATCHPOINT 0
240 #undef HAVE_NONSTEPPABLE_WATCHPOINT
241 #define HAVE_NONSTEPPABLE_WATCHPOINT 1
244 #ifndef HAVE_CONTINUABLE_WATCHPOINT
245 #define HAVE_CONTINUABLE_WATCHPOINT 0
247 #undef HAVE_CONTINUABLE_WATCHPOINT
248 #define HAVE_CONTINUABLE_WATCHPOINT 1
251 /* Tables of how to react to signals; the user sets them. */
253 static unsigned char *signal_stop;
254 static unsigned char *signal_print;
255 static unsigned char *signal_program;
257 #define SET_SIGS(nsigs,sigs,flags) \
259 int signum = (nsigs); \
260 while (signum-- > 0) \
261 if ((sigs)[signum]) \
262 (flags)[signum] = 1; \
265 #define UNSET_SIGS(nsigs,sigs,flags) \
267 int signum = (nsigs); \
268 while (signum-- > 0) \
269 if ((sigs)[signum]) \
270 (flags)[signum] = 0; \
274 /* Command list pointer for the "stop" placeholder. */
276 static struct cmd_list_element *stop_command;
278 /* Nonzero if breakpoints are now inserted in the inferior. */
280 static int breakpoints_inserted;
282 /* Function inferior was in as of last step command. */
284 static struct symbol *step_start_function;
286 /* Nonzero if we are expecting a trace trap and should proceed from it. */
288 static int trap_expected;
291 /* Nonzero if we want to give control to the user when we're notified
292 of shared library events by the dynamic linker. */
293 static int stop_on_solib_events;
297 /* Nonzero if the next time we try to continue the inferior, it will
298 step one instruction and generate a spurious trace trap.
299 This is used to compensate for a bug in HP-UX. */
301 static int trap_expected_after_continue;
304 /* Nonzero means expecting a trace trap
305 and should stop the inferior and return silently when it happens. */
309 /* Nonzero means expecting a trap and caller will handle it themselves.
310 It is used after attach, due to attaching to a process;
311 when running in the shell before the child program has been exec'd;
312 and when running some kinds of remote stuff (FIXME?). */
314 int stop_soon_quietly;
316 /* Nonzero if proceed is being used for a "finish" command or a similar
317 situation when stop_registers should be saved. */
319 int proceed_to_finish;
321 /* Save register contents here when about to pop a stack dummy frame,
322 if-and-only-if proceed_to_finish is set.
323 Thus this contains the return value from the called function (assuming
324 values are returned in a register). */
326 char *stop_registers;
328 /* Nonzero if program stopped due to error trying to insert breakpoints. */
330 static int breakpoints_failed;
332 /* Nonzero after stop if current stack frame should be printed. */
334 static int stop_print_frame;
336 static struct breakpoint *step_resume_breakpoint = NULL;
337 static struct breakpoint *through_sigtramp_breakpoint = NULL;
339 /* On some platforms (e.g., HP-UX), hardware watchpoints have bad
340 interactions with an inferior that is running a kernel function
341 (aka, a system call or "syscall"). wait_for_inferior therefore
342 may have a need to know when the inferior is in a syscall. This
343 is a count of the number of inferior threads which are known to
344 currently be running in a syscall. */
345 static int number_of_threads_in_syscalls;
347 /* This is used to remember when a fork, vfork or exec event
348 was caught by a catchpoint, and thus the event is to be
349 followed at the next resume of the inferior, and not
353 enum target_waitkind kind;
363 char *execd_pathname;
367 /* Some platforms don't allow us to do anything meaningful with a
368 vforked child until it has exec'd. Vforked processes on such
369 platforms can only be followed after they've exec'd.
371 When this is set to 0, a vfork can be immediately followed,
372 and an exec can be followed merely as an exec. When this is
373 set to 1, a vfork event has been seen, but cannot be followed
374 until the exec is seen.
376 (In the latter case, inferior_pid is still the parent of the
377 vfork, and pending_follow.fork_event.child_pid is the child. The
378 appropriate process is followed, according to the setting of
379 follow-fork-mode.) */
380 static int follow_vfork_when_exec;
382 static char *follow_fork_mode_kind_names[] =
384 /* ??rehrauer: The "both" option is broken, by what may be a 10.20
385 kernel problem. It's also not terribly useful without a GUI to
386 help the user drive two debuggers. So for now, I'm disabling
388 "parent", "child", "both", "ask" };
390 "parent", "child", "ask"};
392 static char *follow_fork_mode_string = NULL;
396 follow_inferior_fork (parent_pid, child_pid, has_forked, has_vforked)
402 int followed_parent = 0;
403 int followed_child = 0;
406 /* Which process did the user want us to follow? */
408 savestring (follow_fork_mode_string, strlen (follow_fork_mode_string));
410 /* Or, did the user not know, and want us to ask? */
411 if (STREQ (follow_fork_mode_string, "ask"))
413 char requested_mode[100];
416 error ("\"ask\" mode NYI");
417 follow_mode = savestring (requested_mode, strlen (requested_mode));
420 /* If we're to be following the parent, then detach from child_pid.
421 We're already following the parent, so need do nothing explicit
423 if (STREQ (follow_mode, "parent"))
427 /* We're already attached to the parent, by default. */
429 /* Before detaching from the child, remove all breakpoints from
430 it. (This won't actually modify the breakpoint list, but will
431 physically remove the breakpoints from the child.) */
432 if (!has_vforked || !follow_vfork_when_exec)
434 detach_breakpoints (child_pid);
435 #ifdef SOLIB_REMOVE_INFERIOR_HOOK
436 SOLIB_REMOVE_INFERIOR_HOOK (child_pid);
440 /* Detach from the child. */
443 target_require_detach (child_pid, "", 1);
446 /* If we're to be following the child, then attach to it, detach
447 from inferior_pid, and set inferior_pid to child_pid. */
448 else if (STREQ (follow_mode, "child"))
450 char child_pid_spelling[100]; /* Arbitrary length. */
454 /* Before detaching from the parent, detach all breakpoints from
455 the child. But only if we're forking, or if we follow vforks
456 as soon as they happen. (If we're following vforks only when
457 the child has exec'd, then it's very wrong to try to write
458 back the "shadow contents" of inserted breakpoints now -- they
459 belong to the child's pre-exec'd a.out.) */
460 if (!has_vforked || !follow_vfork_when_exec)
462 detach_breakpoints (child_pid);
465 /* Before detaching from the parent, remove all breakpoints from it. */
466 remove_breakpoints ();
468 /* Also reset the solib inferior hook from the parent. */
469 #ifdef SOLIB_REMOVE_INFERIOR_HOOK
470 SOLIB_REMOVE_INFERIOR_HOOK (inferior_pid);
473 /* Detach from the parent. */
475 target_detach (NULL, 1);
477 /* Attach to the child. */
478 inferior_pid = child_pid;
479 sprintf (child_pid_spelling, "%d", child_pid);
482 target_require_attach (child_pid_spelling, 1);
484 /* Was there a step_resume breakpoint? (There was if the user
485 did a "next" at the fork() call.) If so, explicitly reset its
488 step_resumes are a form of bp that are made to be per-thread.
489 Since we created the step_resume bp when the parent process
490 was being debugged, and now are switching to the child process,
491 from the breakpoint package's viewpoint, that's a switch of
492 "threads". We must update the bp's notion of which thread
493 it is for, or it'll be ignored when it triggers... */
494 if (step_resume_breakpoint &&
495 (!has_vforked || !follow_vfork_when_exec))
496 breakpoint_re_set_thread (step_resume_breakpoint);
498 /* Reinsert all breakpoints in the child. (The user may've set
499 breakpoints after catching the fork, in which case those
500 actually didn't get set in the child, but only in the parent.) */
501 if (!has_vforked || !follow_vfork_when_exec)
503 breakpoint_re_set ();
504 insert_breakpoints ();
508 /* If we're to be following both parent and child, then fork ourselves,
509 and attach the debugger clone to the child. */
510 else if (STREQ (follow_mode, "both"))
512 char pid_suffix[100]; /* Arbitrary length. */
514 /* Clone ourselves to follow the child. This is the end of our
515 involvement with child_pid; our clone will take it from here... */
517 target_clone_and_follow_inferior (child_pid, &followed_child);
518 followed_parent = !followed_child;
520 /* We continue to follow the parent. To help distinguish the two
521 debuggers, though, both we and our clone will reset our prompts. */
522 sprintf (pid_suffix, "[%d] ", inferior_pid);
523 set_prompt (strcat (get_prompt (), pid_suffix));
526 /* The parent and child of a vfork share the same address space.
527 Also, on some targets the order in which vfork and exec events
528 are received for parent in child requires some delicate handling
531 For instance, on ptrace-based HPUX we receive the child's vfork
532 event first, at which time the parent has been suspended by the
533 OS and is essentially untouchable until the child's exit or second
534 exec event arrives. At that time, the parent's vfork event is
535 delivered to us, and that's when we see and decide how to follow
536 the vfork. But to get to that point, we must continue the child
537 until it execs or exits. To do that smoothly, all breakpoints
538 must be removed from the child, in case there are any set between
539 the vfork() and exec() calls. But removing them from the child
540 also removes them from the parent, due to the shared-address-space
541 nature of a vfork'd parent and child. On HPUX, therefore, we must
542 take care to restore the bp's to the parent before we continue it.
543 Else, it's likely that we may not stop in the expected place. (The
544 worst scenario is when the user tries to step over a vfork() call;
545 the step-resume bp must be restored for the step to properly stop
546 in the parent after the call completes!)
548 Sequence of events, as reported to gdb from HPUX:
550 Parent Child Action for gdb to take
551 -------------------------------------------------------
552 1 VFORK Continue child
558 target_post_follow_vfork (parent_pid,
564 pending_follow.fork_event.saw_parent_fork = 0;
565 pending_follow.fork_event.saw_child_fork = 0;
571 follow_fork (parent_pid, child_pid)
575 follow_inferior_fork (parent_pid, child_pid, 1, 0);
579 /* Forward declaration. */
580 static void follow_exec PARAMS ((int, char *));
583 follow_vfork (parent_pid, child_pid)
587 follow_inferior_fork (parent_pid, child_pid, 0, 1);
589 /* Did we follow the child? Had it exec'd before we saw the parent vfork? */
590 if (pending_follow.fork_event.saw_child_exec && (inferior_pid == child_pid))
592 pending_follow.fork_event.saw_child_exec = 0;
593 pending_follow.kind = TARGET_WAITKIND_SPURIOUS;
594 follow_exec (inferior_pid, pending_follow.execd_pathname);
595 free (pending_follow.execd_pathname);
600 follow_exec (pid, execd_pathname)
602 char *execd_pathname;
605 struct target_ops *tgt;
607 if (!may_follow_exec)
610 /* Did this exec() follow a vfork()? If so, we must follow the
611 vfork now too. Do it before following the exec. */
612 if (follow_vfork_when_exec &&
613 (pending_follow.kind == TARGET_WAITKIND_VFORKED))
615 pending_follow.kind = TARGET_WAITKIND_SPURIOUS;
616 follow_vfork (inferior_pid, pending_follow.fork_event.child_pid);
617 follow_vfork_when_exec = 0;
618 saved_pid = inferior_pid;
620 /* Did we follow the parent? If so, we're done. If we followed
621 the child then we must also follow its exec(). */
622 if (inferior_pid == pending_follow.fork_event.parent_pid)
626 /* This is an exec event that we actually wish to pay attention to.
627 Refresh our symbol table to the newly exec'd program, remove any
630 If there are breakpoints, they aren't really inserted now,
631 since the exec() transformed our inferior into a fresh set
634 We want to preserve symbolic breakpoints on the list, since
635 we have hopes that they can be reset after the new a.out's
636 symbol table is read.
638 However, any "raw" breakpoints must be removed from the list
639 (e.g., the solib bp's), since their address is probably invalid
642 And, we DON'T want to call delete_breakpoints() here, since
643 that may write the bp's "shadow contents" (the instruction
644 value that was overwritten witha TRAP instruction). Since
645 we now have a new a.out, those shadow contents aren't valid. */
646 update_breakpoints_after_exec ();
648 /* If there was one, it's gone now. We cannot truly step-to-next
649 statement through an exec(). */
650 step_resume_breakpoint = NULL;
651 step_range_start = 0;
654 /* If there was one, it's gone now. */
655 through_sigtramp_breakpoint = NULL;
657 /* What is this a.out's name? */
658 printf_unfiltered ("Executing new program: %s\n", execd_pathname);
660 /* We've followed the inferior through an exec. Therefore, the
661 inferior has essentially been killed & reborn. */
663 /* First collect the run target in effect. */
664 tgt = find_run_target ();
665 /* If we can't find one, things are in a very strange state... */
667 error ("Could find run target to save before following exec");
669 gdb_flush (gdb_stdout);
670 target_mourn_inferior ();
671 inferior_pid = saved_pid; /* Because mourn_inferior resets inferior_pid. */
674 /* That a.out is now the one to use. */
675 exec_file_attach (execd_pathname, 0);
677 /* And also is where symbols can be found. */
678 symbol_file_command (execd_pathname, 0);
680 /* Reset the shared library package. This ensures that we get
681 a shlib event when the child reaches "_start", at which point
682 the dld will have had a chance to initialize the child. */
683 #if defined(SOLIB_RESTART)
686 #ifdef SOLIB_CREATE_INFERIOR_HOOK
687 SOLIB_CREATE_INFERIOR_HOOK (inferior_pid);
690 /* Reinsert all breakpoints. (Those which were symbolic have
691 been reset to the proper address in the new a.out, thanks
692 to symbol_file_command...) */
693 insert_breakpoints ();
695 /* The next resume of this inferior should bring it to the shlib
696 startup breakpoints. (If the user had also set bp's on
697 "main" from the old (parent) process, then they'll auto-
698 matically get reset there in the new process.) */
701 /* Non-zero if we just simulating a single-step. This is needed
702 because we cannot remove the breakpoints in the inferior process
703 until after the `wait' in `wait_for_inferior'. */
704 static int singlestep_breakpoints_inserted_p = 0;
707 /* Things to clean up if we QUIT out of resume (). */
710 resume_cleanups (arg)
716 static char schedlock_off[] = "off";
717 static char schedlock_on[] = "on";
718 static char schedlock_step[] = "step";
719 static char *scheduler_mode = schedlock_off;
720 static char *scheduler_enums[] =
721 {schedlock_off, schedlock_on, schedlock_step};
724 set_schedlock_func (args, from_tty, c)
727 struct cmd_list_element *c;
729 if (c->type == set_cmd)
730 if (!target_can_lock_scheduler)
732 scheduler_mode = schedlock_off;
733 error ("Target '%s' cannot support this command.",
739 /* Resume the inferior, but allow a QUIT. This is useful if the user
740 wants to interrupt some lengthy single-stepping operation
741 (for child processes, the SIGINT goes to the inferior, and so
742 we get a SIGINT random_signal, but for remote debugging and perhaps
743 other targets, that's not true).
745 STEP nonzero if we should step (zero to continue instead).
746 SIG is the signal to give the inferior (zero for none). */
750 enum target_signal sig;
752 int should_resume = 1;
753 struct cleanup *old_cleanups = make_cleanup ((make_cleanup_func)
757 #ifdef CANNOT_STEP_BREAKPOINT
758 /* Most targets can step a breakpoint instruction, thus executing it
759 normally. But if this one cannot, just continue and we will hit
761 if (step && breakpoints_inserted && breakpoint_here_p (read_pc ()))
765 if (SOFTWARE_SINGLE_STEP_P && step)
767 /* Do it the hard way, w/temp breakpoints */
768 SOFTWARE_SINGLE_STEP (sig, 1 /*insert-breakpoints */ );
769 /* ...and don't ask hardware to do it. */
771 /* and do not pull these breakpoints until after a `wait' in
772 `wait_for_inferior' */
773 singlestep_breakpoints_inserted_p = 1;
776 /* Handle any optimized stores to the inferior NOW... */
777 #ifdef DO_DEFERRED_STORES
781 /* If there were any forks/vforks/execs that were caught and are
782 now to be followed, then do so. */
783 switch (pending_follow.kind)
785 case (TARGET_WAITKIND_FORKED):
786 pending_follow.kind = TARGET_WAITKIND_SPURIOUS;
787 follow_fork (inferior_pid, pending_follow.fork_event.child_pid);
790 case (TARGET_WAITKIND_VFORKED):
792 int saw_child_exec = pending_follow.fork_event.saw_child_exec;
794 pending_follow.kind = TARGET_WAITKIND_SPURIOUS;
795 follow_vfork (inferior_pid, pending_follow.fork_event.child_pid);
797 /* Did we follow the child, but not yet see the child's exec event?
798 If so, then it actually ought to be waiting for us; we respond to
799 parent vfork events. We don't actually want to resume the child
800 in this situation; we want to just get its exec event. */
801 if (!saw_child_exec &&
802 (inferior_pid == pending_follow.fork_event.child_pid))
807 case (TARGET_WAITKIND_EXECD):
808 /* If we saw a vfork event but couldn't follow it until we saw
809 an exec, then now might be the time! */
810 pending_follow.kind = TARGET_WAITKIND_SPURIOUS;
811 /* follow_exec is called as soon as the exec event is seen. */
818 /* Install inferior's terminal modes. */
819 target_terminal_inferior ();
823 if (use_thread_step_needed && thread_step_needed)
825 /* We stopped on a BPT instruction;
826 don't continue other threads and
827 just step this thread. */
828 thread_step_needed = 0;
830 if (!breakpoint_here_p (read_pc ()))
832 /* Breakpoint deleted: ok to do regular resume
833 where all the threads either step or continue. */
834 target_resume (-1, step, sig);
840 warning ("Internal error, changing continue to step.");
841 remove_breakpoints ();
842 breakpoints_inserted = 0;
847 target_resume (inferior_pid, step, sig);
852 /* Vanilla resume. */
854 if ((scheduler_mode == schedlock_on) ||
855 (scheduler_mode == schedlock_step && step != 0))
856 target_resume (inferior_pid, step, sig);
858 target_resume (-1, step, sig);
862 discard_cleanups (old_cleanups);
866 /* Clear out all variables saying what to do when inferior is continued.
867 First do this, then set the ones you want, then call `proceed'. */
870 clear_proceed_status ()
873 step_range_start = 0;
875 step_frame_address = 0;
876 step_over_calls = -1;
878 stop_soon_quietly = 0;
879 proceed_to_finish = 0;
880 breakpoint_proceeded = 1; /* We're about to proceed... */
882 /* Discard any remaining commands or status from previous stop. */
883 bpstat_clear (&stop_bpstat);
886 /* Basic routine for continuing the program in various fashions.
888 ADDR is the address to resume at, or -1 for resume where stopped.
889 SIGGNAL is the signal to give it, or 0 for none,
890 or -1 for act according to how it stopped.
891 STEP is nonzero if should trap after one instruction.
892 -1 means return after that and print nothing.
893 You should probably set various step_... variables
894 before calling here, if you are stepping.
896 You should call clear_proceed_status before calling proceed. */
899 proceed (addr, siggnal, step)
901 enum target_signal siggnal;
907 step_start_function = find_pc_function (read_pc ());
911 if (addr == (CORE_ADDR) - 1)
913 /* If there is a breakpoint at the address we will resume at,
914 step one instruction before inserting breakpoints
915 so that we do not stop right away (and report a second
916 hit at this breakpoint). */
918 if (read_pc () == stop_pc && breakpoint_here_p (read_pc ()))
921 #ifndef STEP_SKIPS_DELAY
922 #define STEP_SKIPS_DELAY(pc) (0)
923 #define STEP_SKIPS_DELAY_P (0)
925 /* Check breakpoint_here_p first, because breakpoint_here_p is fast
926 (it just checks internal GDB data structures) and STEP_SKIPS_DELAY
927 is slow (it needs to read memory from the target). */
928 if (STEP_SKIPS_DELAY_P
929 && breakpoint_here_p (read_pc () + 4)
930 && STEP_SKIPS_DELAY (read_pc ()))
937 /* New address; we don't need to single-step a thread
938 over a breakpoint we just hit, 'cause we aren't
939 continuing from there.
941 It's not worth worrying about the case where a user
942 asks for a "jump" at the current PC--if they get the
943 hiccup of re-hiting a hit breakpoint, what else do
945 thread_step_needed = 0;
948 #ifdef PREPARE_TO_PROCEED
949 /* In a multi-threaded task we may select another thread
950 and then continue or step.
952 But if the old thread was stopped at a breakpoint, it
953 will immediately cause another breakpoint stop without
954 any execution (i.e. it will report a breakpoint hit
955 incorrectly). So we must step over it first.
957 PREPARE_TO_PROCEED checks the current thread against the thread
958 that reported the most recent event. If a step-over is required
959 it returns TRUE and sets the current thread to the old thread. */
960 if (PREPARE_TO_PROCEED (1) && breakpoint_here_p (read_pc ()))
963 thread_step_needed = 1;
966 #endif /* PREPARE_TO_PROCEED */
969 if (trap_expected_after_continue)
971 /* If (step == 0), a trap will be automatically generated after
972 the first instruction is executed. Force step one
973 instruction to clear this condition. This should not occur
974 if step is nonzero, but it is harmless in that case. */
976 trap_expected_after_continue = 0;
978 #endif /* HP_OS_BUG */
981 /* We will get a trace trap after one instruction.
982 Continue it automatically and insert breakpoints then. */
986 int temp = insert_breakpoints ();
989 print_sys_errmsg ("ptrace", temp);
990 error ("Cannot insert breakpoints.\n\
991 The same program may be running in another process.");
994 breakpoints_inserted = 1;
997 if (siggnal != TARGET_SIGNAL_DEFAULT)
998 stop_signal = siggnal;
999 /* If this signal should not be seen by program,
1000 give it zero. Used for debugging signals. */
1001 else if (!signal_program[stop_signal])
1002 stop_signal = TARGET_SIGNAL_0;
1004 annotate_starting ();
1006 /* Make sure that output from GDB appears before output from the
1008 gdb_flush (gdb_stdout);
1010 /* Resume inferior. */
1011 resume (oneproc || step || bpstat_should_step (), stop_signal);
1013 /* Wait for it to stop (if not standalone)
1014 and in any case decode why it stopped, and act accordingly. */
1015 /* Do this only if we are not using the event loop, or if the target
1016 does not support asynchronous execution. */
1017 if (!async_p || !target_has_async)
1019 wait_for_inferior ();
1024 /* Record the pc and sp of the program the last time it stopped.
1025 These are just used internally by wait_for_inferior, but need
1026 to be preserved over calls to it and cleared when the inferior
1028 static CORE_ADDR prev_pc;
1029 static CORE_ADDR prev_func_start;
1030 static char *prev_func_name;
1033 /* Start remote-debugging of a machine over a serial link. */
1037 init_thread_list ();
1038 init_wait_for_inferior ();
1039 stop_soon_quietly = 1;
1042 /* Go on waiting only in case gdb is not started in async mode, or
1043 in case the target doesn't support async execution. */
1044 if (!async_p || !target_has_async)
1046 wait_for_inferior ();
1051 /* The 'tar rem' command should always look synchronous,
1052 i.e. display the prompt only once it has connected and
1053 started the target. */
1055 push_prompt ("", "", "");
1056 delete_file_handler (input_fd);
1057 target_executing = 1;
1061 /* Initialize static vars when a new inferior begins. */
1064 init_wait_for_inferior ()
1066 /* These are meaningless until the first time through wait_for_inferior. */
1068 prev_func_start = 0;
1069 prev_func_name = NULL;
1072 trap_expected_after_continue = 0;
1074 breakpoints_inserted = 0;
1075 breakpoint_init_inferior (inf_starting);
1077 /* Don't confuse first call to proceed(). */
1078 stop_signal = TARGET_SIGNAL_0;
1080 /* The first resume is not following a fork/vfork/exec. */
1081 pending_follow.kind = TARGET_WAITKIND_SPURIOUS; /* I.e., none. */
1082 pending_follow.fork_event.saw_parent_fork = 0;
1083 pending_follow.fork_event.saw_child_fork = 0;
1084 pending_follow.fork_event.saw_child_exec = 0;
1086 /* See wait_for_inferior's handling of SYSCALL_ENTRY/RETURN events. */
1087 number_of_threads_in_syscalls = 0;
1089 clear_proceed_status ();
1093 delete_breakpoint_current_contents (arg)
1096 struct breakpoint **breakpointp = (struct breakpoint **) arg;
1097 if (*breakpointp != NULL)
1099 delete_breakpoint (*breakpointp);
1100 *breakpointp = NULL;
1104 /* This enum encodes possible reasons for doing a target_wait, so that
1105 wfi can call target_wait in one place. (Ultimately the call will be
1106 moved out of the infinite loop entirely.) */
1110 infwait_normal_state,
1111 infwait_thread_hop_state,
1112 infwait_nullified_state,
1113 infwait_nonstep_watch_state
1116 /* This structure contains what used to be local variables in
1117 wait_for_inferior. Probably many of them can return to being
1118 locals in handle_inferior_event. */
1120 struct execution_control_state
1122 struct target_waitstatus ws;
1123 struct target_waitstatus *wp;
1126 CORE_ADDR stop_func_start;
1127 CORE_ADDR stop_func_end;
1128 char *stop_func_name;
1129 struct symtab_and_line sal;
1130 int remove_breakpoints_on_following_step;
1132 struct symtab *current_symtab;
1133 int handling_longjmp; /* FIXME */
1135 int saved_inferior_pid;
1137 int stepping_through_solib_after_catch;
1138 bpstat stepping_through_solib_catchpoints;
1139 int enable_hw_watchpoints_after_wait;
1140 int stepping_through_sigtramp;
1141 int new_thread_event;
1142 struct target_waitstatus tmpstatus;
1143 enum infwait_states infwait_state;
1148 void init_execution_control_state PARAMS ((struct execution_control_state * ecs));
1150 void handle_inferior_event PARAMS ((struct execution_control_state * ecs));
1152 /* Wait for control to return from inferior to debugger.
1153 If inferior gets a signal, we may decide to start it up again
1154 instead of returning. That is why there is a loop in this function.
1155 When this function actually returns it means the inferior
1156 should be left stopped and GDB should read more commands. */
1159 wait_for_inferior ()
1161 struct cleanup *old_cleanups;
1162 struct execution_control_state ecss;
1163 struct execution_control_state *ecs;
1165 old_cleanups = make_cleanup (delete_breakpoint_current_contents,
1166 &step_resume_breakpoint);
1167 make_cleanup (delete_breakpoint_current_contents,
1168 &through_sigtramp_breakpoint);
1170 /* wfi still stays in a loop, so it's OK just to take the address of
1171 a local to get the ecs pointer. */
1174 /* Fill in with reasonable starting values. */
1175 init_execution_control_state (ecs);
1177 thread_step_needed = 0;
1179 /* We'll update this if & when we switch to a new thread. */
1180 if (may_switch_from_inferior_pid)
1181 switched_from_inferior_pid = inferior_pid;
1183 overlay_cache_invalid = 1;
1185 /* We have to invalidate the registers BEFORE calling target_wait
1186 because they can be loaded from the target while in target_wait.
1187 This makes remote debugging a bit more efficient for those
1188 targets that provide critical registers as part of their normal
1189 status mechanism. */
1191 registers_changed ();
1195 if (target_wait_hook)
1196 ecs->pid = target_wait_hook (ecs->waiton_pid, ecs->wp);
1198 ecs->pid = target_wait (ecs->waiton_pid, ecs->wp);
1200 /* Now figure out what to do with the result of the result. */
1201 handle_inferior_event (ecs);
1203 if (!ecs->wait_some_more)
1206 do_cleanups (old_cleanups);
1209 /* Asynchronous version of wait_for_inferior. It is called by the
1210 event loop whenever a change of state is detected on the file
1211 descriptor corresponding to the target. It can be called more than
1212 once to complete a single execution command. In such cases we need
1213 to keep the state in a global variable ASYNC_ECSS. If it is the
1214 last time that this function is called for a single execution
1215 command, then report to the user that the inferior has stopped, and
1216 do the necessary cleanups. */
1218 struct execution_control_state async_ecss;
1219 struct execution_control_state *async_ecs;
1222 fetch_inferior_event ()
1224 static struct cleanup *old_cleanups;
1226 async_ecs = &async_ecss;
1228 if (!async_ecs->wait_some_more)
1230 old_cleanups = make_exec_cleanup (delete_breakpoint_current_contents,
1231 &step_resume_breakpoint);
1232 make_exec_cleanup (delete_breakpoint_current_contents,
1233 &through_sigtramp_breakpoint);
1235 /* Fill in with reasonable starting values. */
1236 init_execution_control_state (async_ecs);
1238 thread_step_needed = 0;
1240 /* We'll update this if & when we switch to a new thread. */
1241 if (may_switch_from_inferior_pid)
1242 switched_from_inferior_pid = inferior_pid;
1244 overlay_cache_invalid = 1;
1246 /* We have to invalidate the registers BEFORE calling target_wait
1247 because they can be loaded from the target while in target_wait.
1248 This makes remote debugging a bit more efficient for those
1249 targets that provide critical registers as part of their normal
1250 status mechanism. */
1252 registers_changed ();
1255 if (target_wait_hook)
1256 async_ecs->pid = target_wait_hook (async_ecs->waiton_pid, async_ecs->wp);
1258 async_ecs->pid = target_wait (async_ecs->waiton_pid, async_ecs->wp);
1260 /* Now figure out what to do with the result of the result. */
1261 handle_inferior_event (async_ecs);
1263 if (!async_ecs->wait_some_more)
1265 /* Do only the cleanups that have been added by this
1266 function. Let the continuations for the commands do the rest,
1267 if there are any. */
1268 do_exec_cleanups (old_cleanups);
1270 /* Is there anything left to do for the command issued to
1272 do_all_continuations ();
1273 /* Reset things after target has stopped for the async commands. */
1274 complete_execution ();
1278 /* Prepare an execution control state for looping through a
1279 wait_for_inferior-type loop. */
1282 init_execution_control_state (ecs)
1283 struct execution_control_state *ecs;
1285 ecs->random_signal = 0;
1286 ecs->remove_breakpoints_on_following_step = 0;
1287 ecs->handling_longjmp = 0; /* FIXME */
1288 ecs->update_step_sp = 0;
1289 ecs->stepping_through_solib_after_catch = 0;
1290 ecs->stepping_through_solib_catchpoints = NULL;
1291 ecs->enable_hw_watchpoints_after_wait = 0;
1292 ecs->stepping_through_sigtramp = 0;
1293 ecs->sal = find_pc_line (prev_pc, 0);
1294 ecs->current_line = ecs->sal.line;
1295 ecs->current_symtab = ecs->sal.symtab;
1296 ecs->infwait_state = infwait_normal_state;
1297 ecs->waiton_pid = -1;
1298 ecs->wp = &(ecs->ws);
1301 /* Given an execution control state that has been freshly filled in
1302 by an event from the inferior, figure out what it means and take
1303 appropriate action. */
1306 handle_inferior_event (ecs)
1307 struct execution_control_state *ecs;
1310 int stepped_after_stopped_by_watchpoint;
1312 /* Keep this extra brace for now, minimizes diffs. */
1314 switch (ecs->infwait_state)
1316 case infwait_normal_state:
1317 /* Since we've done a wait, we have a new event. Don't
1318 carry over any expectations about needing to step over a
1320 thread_step_needed = 0;
1322 /* See comments where a TARGET_WAITKIND_SYSCALL_RETURN event
1323 is serviced in this loop, below. */
1324 if (ecs->enable_hw_watchpoints_after_wait)
1326 TARGET_ENABLE_HW_WATCHPOINTS (inferior_pid);
1327 ecs->enable_hw_watchpoints_after_wait = 0;
1329 stepped_after_stopped_by_watchpoint = 0;
1332 case infwait_thread_hop_state:
1333 insert_breakpoints ();
1335 /* We need to restart all the threads now,
1336 * unles we're running in scheduler-locked mode.
1337 * FIXME: shouldn't we look at currently_stepping ()?
1339 if (scheduler_mode == schedlock_on)
1340 target_resume (ecs->pid, 0, TARGET_SIGNAL_0);
1342 target_resume (-1, 0, TARGET_SIGNAL_0);
1343 ecs->infwait_state = infwait_normal_state;
1346 case infwait_nullified_state:
1349 case infwait_nonstep_watch_state:
1350 insert_breakpoints ();
1352 /* FIXME-maybe: is this cleaner than setting a flag? Does it
1353 handle things like signals arriving and other things happening
1354 in combination correctly? */
1355 stepped_after_stopped_by_watchpoint = 1;
1358 ecs->infwait_state = infwait_normal_state;
1360 flush_cached_frames ();
1362 /* If it's a new process, add it to the thread database */
1364 ecs->new_thread_event = ((ecs->pid != inferior_pid) && !in_thread_list (ecs->pid));
1366 if (ecs->ws.kind != TARGET_WAITKIND_EXITED
1367 && ecs->ws.kind != TARGET_WAITKIND_SIGNALLED
1368 && ecs->new_thread_event)
1370 add_thread (ecs->pid);
1372 printf_filtered ("[New %s]\n", target_pid_or_tid_to_str (ecs->pid));
1375 /* NOTE: This block is ONLY meant to be invoked in case of a
1376 "thread creation event"! If it is invoked for any other
1377 sort of event (such as a new thread landing on a breakpoint),
1378 the event will be discarded, which is almost certainly
1381 To avoid this, the low-level module (eg. target_wait)
1382 should call in_thread_list and add_thread, so that the
1383 new thread is known by the time we get here. */
1385 /* We may want to consider not doing a resume here in order
1386 to give the user a chance to play with the new thread.
1387 It might be good to make that a user-settable option. */
1389 /* At this point, all threads are stopped (happens
1390 automatically in either the OS or the native code).
1391 Therefore we need to continue all threads in order to
1394 target_resume (-1, 0, TARGET_SIGNAL_0);
1399 switch (ecs->ws.kind)
1401 case TARGET_WAITKIND_LOADED:
1402 /* Ignore gracefully during startup of the inferior, as it
1403 might be the shell which has just loaded some objects,
1404 otherwise add the symbols for the newly loaded objects. */
1406 if (!stop_soon_quietly)
1408 /* Remove breakpoints, SOLIB_ADD might adjust
1409 breakpoint addresses via breakpoint_re_set. */
1410 if (breakpoints_inserted)
1411 remove_breakpoints ();
1413 /* Check for any newly added shared libraries if we're
1414 supposed to be adding them automatically. */
1417 /* Switch terminal for any messages produced by
1418 breakpoint_re_set. */
1419 target_terminal_ours_for_output ();
1420 SOLIB_ADD (NULL, 0, NULL);
1421 target_terminal_inferior ();
1424 /* Reinsert breakpoints and continue. */
1425 if (breakpoints_inserted)
1426 insert_breakpoints ();
1429 resume (0, TARGET_SIGNAL_0);
1432 case TARGET_WAITKIND_SPURIOUS:
1433 resume (0, TARGET_SIGNAL_0);
1436 case TARGET_WAITKIND_EXITED:
1437 target_terminal_ours (); /* Must do this before mourn anyway */
1438 annotate_exited (ecs->ws.value.integer);
1439 if (ecs->ws.value.integer)
1440 printf_filtered ("\nProgram exited with code 0%o.\n",
1441 (unsigned int) ecs->ws.value.integer);
1443 printf_filtered ("\nProgram exited normally.\n");
1445 /* Record the exit code in the convenience variable $_exitcode, so
1446 that the user can inspect this again later. */
1447 set_internalvar (lookup_internalvar ("_exitcode"),
1448 value_from_longest (builtin_type_int,
1449 (LONGEST) ecs->ws.value.integer));
1450 gdb_flush (gdb_stdout);
1451 target_mourn_inferior ();
1452 singlestep_breakpoints_inserted_p = 0; /*SOFTWARE_SINGLE_STEP_P */
1453 stop_print_frame = 0;
1456 case TARGET_WAITKIND_SIGNALLED:
1457 stop_print_frame = 0;
1458 stop_signal = ecs->ws.value.sig;
1459 target_terminal_ours (); /* Must do this before mourn anyway */
1460 annotate_signalled ();
1462 /* This looks pretty bogus to me. Doesn't TARGET_WAITKIND_SIGNALLED
1463 mean it is already dead? This has been here since GDB 2.8, so
1464 perhaps it means rms didn't understand unix waitstatuses?
1465 For the moment I'm just kludging around this in remote.c
1466 rather than trying to change it here --kingdon, 5 Dec 1994. */
1467 target_kill (); /* kill mourns as well */
1469 printf_filtered ("\nProgram terminated with signal ");
1470 annotate_signal_name ();
1471 printf_filtered ("%s", target_signal_to_name (stop_signal));
1472 annotate_signal_name_end ();
1473 printf_filtered (", ");
1474 annotate_signal_string ();
1475 printf_filtered ("%s", target_signal_to_string (stop_signal));
1476 annotate_signal_string_end ();
1477 printf_filtered (".\n");
1479 printf_filtered ("The program no longer exists.\n");
1480 gdb_flush (gdb_stdout);
1481 singlestep_breakpoints_inserted_p = 0; /*SOFTWARE_SINGLE_STEP_P */
1484 /* The following are the only cases in which we keep going;
1485 the above cases end in a continue or goto. */
1486 case TARGET_WAITKIND_FORKED:
1487 stop_signal = TARGET_SIGNAL_TRAP;
1488 pending_follow.kind = ecs->ws.kind;
1490 /* Ignore fork events reported for the parent; we're only
1491 interested in reacting to forks of the child. Note that
1492 we expect the child's fork event to be available if we
1493 waited for it now. */
1494 if (inferior_pid == ecs->pid)
1496 pending_follow.fork_event.saw_parent_fork = 1;
1497 pending_follow.fork_event.parent_pid = ecs->pid;
1498 pending_follow.fork_event.child_pid = ecs->ws.value.related_pid;
1503 pending_follow.fork_event.saw_child_fork = 1;
1504 pending_follow.fork_event.child_pid = ecs->pid;
1505 pending_follow.fork_event.parent_pid = ecs->ws.value.related_pid;
1508 stop_pc = read_pc_pid (ecs->pid);
1509 ecs->saved_inferior_pid = inferior_pid;
1510 inferior_pid = ecs->pid;
1511 stop_bpstat = bpstat_stop_status
1513 (DECR_PC_AFTER_BREAK ?
1514 (prev_pc != stop_pc - DECR_PC_AFTER_BREAK
1515 && currently_stepping (ecs))
1518 ecs->random_signal = !bpstat_explains_signal (stop_bpstat);
1519 inferior_pid = ecs->saved_inferior_pid;
1520 goto process_event_stop_test;
1522 /* If this a platform which doesn't allow a debugger to touch a
1523 vfork'd inferior until after it exec's, then we'd best keep
1524 our fingers entirely off the inferior, other than continuing
1525 it. This has the unfortunate side-effect that catchpoints
1526 of vforks will be ignored. But since the platform doesn't
1527 allow the inferior be touched at vfork time, there's really
1529 case TARGET_WAITKIND_VFORKED:
1530 stop_signal = TARGET_SIGNAL_TRAP;
1531 pending_follow.kind = ecs->ws.kind;
1533 /* Is this a vfork of the parent? If so, then give any
1534 vfork catchpoints a chance to trigger now. (It's
1535 dangerous to do so if the child canot be touched until
1536 it execs, and the child has not yet exec'd. We probably
1537 should warn the user to that effect when the catchpoint
1539 if (ecs->pid == inferior_pid)
1541 pending_follow.fork_event.saw_parent_fork = 1;
1542 pending_follow.fork_event.parent_pid = ecs->pid;
1543 pending_follow.fork_event.child_pid = ecs->ws.value.related_pid;
1546 /* If we've seen the child's vfork event but cannot really touch
1547 the child until it execs, then we must continue the child now.
1548 Else, give any vfork catchpoints a chance to trigger now. */
1551 pending_follow.fork_event.saw_child_fork = 1;
1552 pending_follow.fork_event.child_pid = ecs->pid;
1553 pending_follow.fork_event.parent_pid = ecs->ws.value.related_pid;
1554 target_post_startup_inferior (pending_follow.fork_event.child_pid);
1555 follow_vfork_when_exec = !target_can_follow_vfork_prior_to_exec ();
1556 if (follow_vfork_when_exec)
1558 target_resume (ecs->pid, 0, TARGET_SIGNAL_0);
1563 stop_pc = read_pc ();
1564 stop_bpstat = bpstat_stop_status
1566 (DECR_PC_AFTER_BREAK ?
1567 (prev_pc != stop_pc - DECR_PC_AFTER_BREAK
1568 && currently_stepping (ecs))
1571 ecs->random_signal = !bpstat_explains_signal (stop_bpstat);
1572 goto process_event_stop_test;
1574 case TARGET_WAITKIND_EXECD:
1575 stop_signal = TARGET_SIGNAL_TRAP;
1577 /* Is this a target which reports multiple exec events per actual
1578 call to exec()? (HP-UX using ptrace does, for example.) If so,
1579 ignore all but the last one. Just resume the exec'r, and wait
1580 for the next exec event. */
1581 if (inferior_ignoring_leading_exec_events)
1583 inferior_ignoring_leading_exec_events--;
1584 if (pending_follow.kind == TARGET_WAITKIND_VFORKED)
1585 ENSURE_VFORKING_PARENT_REMAINS_STOPPED (pending_follow.fork_event.parent_pid);
1586 target_resume (ecs->pid, 0, TARGET_SIGNAL_0);
1589 inferior_ignoring_leading_exec_events =
1590 target_reported_exec_events_per_exec_call () - 1;
1592 pending_follow.execd_pathname = savestring (ecs->ws.value.execd_pathname,
1593 strlen (ecs->ws.value.execd_pathname));
1595 /* Did inferior_pid exec, or did a (possibly not-yet-followed)
1596 child of a vfork exec?
1598 ??rehrauer: This is unabashedly an HP-UX specific thing. On
1599 HP-UX, events associated with a vforking inferior come in
1600 threes: a vfork event for the child (always first), followed
1601 a vfork event for the parent and an exec event for the child.
1602 The latter two can come in either order.
1604 If we get the parent vfork event first, life's good: We follow
1605 either the parent or child, and then the child's exec event is
1608 But if we get the child's exec event first, then we delay
1609 responding to it until we handle the parent's vfork. Because,
1610 otherwise we can't satisfy a "catch vfork". */
1611 if (pending_follow.kind == TARGET_WAITKIND_VFORKED)
1613 pending_follow.fork_event.saw_child_exec = 1;
1615 /* On some targets, the child must be resumed before
1616 the parent vfork event is delivered. A single-step
1618 if (RESUME_EXECD_VFORKING_CHILD_TO_GET_PARENT_VFORK ())
1619 target_resume (ecs->pid, 1, TARGET_SIGNAL_0);
1620 /* We expect the parent vfork event to be available now. */
1624 /* This causes the eventpoints and symbol table to be reset. Must
1625 do this now, before trying to determine whether to stop. */
1626 follow_exec (inferior_pid, pending_follow.execd_pathname);
1627 free (pending_follow.execd_pathname);
1629 stop_pc = read_pc_pid (ecs->pid);
1630 ecs->saved_inferior_pid = inferior_pid;
1631 inferior_pid = ecs->pid;
1632 stop_bpstat = bpstat_stop_status
1634 (DECR_PC_AFTER_BREAK ?
1635 (prev_pc != stop_pc - DECR_PC_AFTER_BREAK
1636 && currently_stepping (ecs))
1639 ecs->random_signal = !bpstat_explains_signal (stop_bpstat);
1640 inferior_pid = ecs->saved_inferior_pid;
1641 goto process_event_stop_test;
1643 /* These syscall events are returned on HP-UX, as part of its
1644 implementation of page-protection-based "hardware" watchpoints.
1645 HP-UX has unfortunate interactions between page-protections and
1646 some system calls. Our solution is to disable hardware watches
1647 when a system call is entered, and reenable them when the syscall
1648 completes. The downside of this is that we may miss the precise
1649 point at which a watched piece of memory is modified. "Oh well."
1651 Note that we may have multiple threads running, which may each
1652 enter syscalls at roughly the same time. Since we don't have a
1653 good notion currently of whether a watched piece of memory is
1654 thread-private, we'd best not have any page-protections active
1655 when any thread is in a syscall. Thus, we only want to reenable
1656 hardware watches when no threads are in a syscall.
1658 Also, be careful not to try to gather much state about a thread
1659 that's in a syscall. It's frequently a losing proposition. */
1660 case TARGET_WAITKIND_SYSCALL_ENTRY:
1661 number_of_threads_in_syscalls++;
1662 if (number_of_threads_in_syscalls == 1)
1664 TARGET_DISABLE_HW_WATCHPOINTS (inferior_pid);
1666 resume (0, TARGET_SIGNAL_0);
1669 /* Before examining the threads further, step this thread to
1670 get it entirely out of the syscall. (We get notice of the
1671 event when the thread is just on the verge of exiting a
1672 syscall. Stepping one instruction seems to get it back
1675 Note that although the logical place to reenable h/w watches
1676 is here, we cannot. We cannot reenable them before stepping
1677 the thread (this causes the next wait on the thread to hang).
1679 Nor can we enable them after stepping until we've done a wait.
1680 Thus, we simply set the flag ecs->enable_hw_watchpoints_after_wait
1681 here, which will be serviced immediately after the target
1683 case TARGET_WAITKIND_SYSCALL_RETURN:
1684 target_resume (ecs->pid, 1, TARGET_SIGNAL_0);
1686 if (number_of_threads_in_syscalls > 0)
1688 number_of_threads_in_syscalls--;
1689 ecs->enable_hw_watchpoints_after_wait =
1690 (number_of_threads_in_syscalls == 0);
1694 case TARGET_WAITKIND_STOPPED:
1695 stop_signal = ecs->ws.value.sig;
1699 /* We may want to consider not doing a resume here in order to give
1700 the user a chance to play with the new thread. It might be good
1701 to make that a user-settable option. */
1703 /* At this point, all threads are stopped (happens automatically in
1704 either the OS or the native code). Therefore we need to continue
1705 all threads in order to make progress. */
1706 if (ecs->new_thread_event)
1708 target_resume (-1, 0, TARGET_SIGNAL_0);
1712 stop_pc = read_pc_pid (ecs->pid);
1714 /* See if a thread hit a thread-specific breakpoint that was meant for
1715 another thread. If so, then step that thread past the breakpoint,
1718 if (stop_signal == TARGET_SIGNAL_TRAP)
1720 if (SOFTWARE_SINGLE_STEP_P && singlestep_breakpoints_inserted_p)
1721 ecs->random_signal = 0;
1722 else if (breakpoints_inserted
1723 && breakpoint_here_p (stop_pc - DECR_PC_AFTER_BREAK))
1725 ecs->random_signal = 0;
1726 if (!breakpoint_thread_match (stop_pc - DECR_PC_AFTER_BREAK,
1731 /* Saw a breakpoint, but it was hit by the wrong thread.
1733 write_pc_pid (stop_pc - DECR_PC_AFTER_BREAK, ecs->pid);
1735 remove_status = remove_breakpoints ();
1736 /* Did we fail to remove breakpoints? If so, try
1737 to set the PC past the bp. (There's at least
1738 one situation in which we can fail to remove
1739 the bp's: On HP-UX's that use ttrace, we can't
1740 change the address space of a vforking child
1741 process until the child exits (well, okay, not
1742 then either :-) or execs. */
1743 if (remove_status != 0)
1745 write_pc_pid (stop_pc - DECR_PC_AFTER_BREAK + 4, ecs->pid);
1749 target_resume (ecs->pid, 1, TARGET_SIGNAL_0);
1750 /* FIXME: What if a signal arrives instead of the
1751 single-step happening? */
1753 ecs->waiton_pid = ecs->pid;
1754 ecs->wp = &(ecs->ws);
1755 ecs->infwait_state = infwait_thread_hop_state;
1759 /* We need to restart all the threads now,
1760 * unles we're running in scheduler-locked mode.
1761 * FIXME: shouldn't we look at currently_stepping ()?
1763 if (scheduler_mode == schedlock_on)
1764 target_resume (ecs->pid, 0, TARGET_SIGNAL_0);
1766 target_resume (-1, 0, TARGET_SIGNAL_0);
1771 /* This breakpoint matches--either it is the right
1772 thread or it's a generic breakpoint for all threads.
1773 Remember that we'll need to step just _this_ thread
1774 on any following user continuation! */
1775 thread_step_needed = 1;
1780 ecs->random_signal = 1;
1782 /* See if something interesting happened to the non-current thread. If
1783 so, then switch to that thread, and eventually give control back to
1786 Note that if there's any kind of pending follow (i.e., of a fork,
1787 vfork or exec), we don't want to do this now. Rather, we'll let
1788 the next resume handle it. */
1789 if ((ecs->pid != inferior_pid) &&
1790 (pending_follow.kind == TARGET_WAITKIND_SPURIOUS))
1794 /* If it's a random signal for a non-current thread, notify user
1795 if he's expressed an interest. */
1796 if (ecs->random_signal
1797 && signal_print[stop_signal])
1799 /* ??rehrauer: I don't understand the rationale for this code. If the
1800 inferior will stop as a result of this signal, then the act of handling
1801 the stop ought to print a message that's couches the stoppage in user
1802 terms, e.g., "Stopped for breakpoint/watchpoint". If the inferior
1803 won't stop as a result of the signal -- i.e., if the signal is merely
1804 a side-effect of something GDB's doing "under the covers" for the
1805 user, such as stepping threads over a breakpoint they shouldn't stop
1806 for -- then the message seems to be a serious annoyance at best.
1808 For now, remove the message altogether. */
1811 target_terminal_ours_for_output ();
1812 printf_filtered ("\nProgram received signal %s, %s.\n",
1813 target_signal_to_name (stop_signal),
1814 target_signal_to_string (stop_signal));
1815 gdb_flush (gdb_stdout);
1819 /* If it's not SIGTRAP and not a signal we want to stop for, then
1820 continue the thread. */
1822 if (stop_signal != TARGET_SIGNAL_TRAP
1823 && !signal_stop[stop_signal])
1826 target_terminal_inferior ();
1828 /* Clear the signal if it should not be passed. */
1829 if (signal_program[stop_signal] == 0)
1830 stop_signal = TARGET_SIGNAL_0;
1832 target_resume (ecs->pid, 0, stop_signal);
1836 /* It's a SIGTRAP or a signal we're interested in. Switch threads,
1837 and fall into the rest of wait_for_inferior(). */
1839 /* Save infrun state for the old thread. */
1840 save_infrun_state (inferior_pid, prev_pc,
1841 prev_func_start, prev_func_name,
1842 trap_expected, step_resume_breakpoint,
1843 through_sigtramp_breakpoint,
1844 step_range_start, step_range_end,
1845 step_frame_address, ecs->handling_longjmp,
1847 ecs->stepping_through_solib_after_catch,
1848 ecs->stepping_through_solib_catchpoints,
1849 ecs->stepping_through_sigtramp);
1851 if (may_switch_from_inferior_pid)
1852 switched_from_inferior_pid = inferior_pid;
1854 inferior_pid = ecs->pid;
1856 /* Load infrun state for the new thread. */
1857 load_infrun_state (inferior_pid, &prev_pc,
1858 &prev_func_start, &prev_func_name,
1859 &trap_expected, &step_resume_breakpoint,
1860 &through_sigtramp_breakpoint,
1861 &step_range_start, &step_range_end,
1862 &step_frame_address, &ecs->handling_longjmp,
1864 &ecs->stepping_through_solib_after_catch,
1865 &ecs->stepping_through_solib_catchpoints,
1866 &ecs->stepping_through_sigtramp);
1869 context_hook (pid_to_thread_id (ecs->pid));
1871 printf_filtered ("[Switching to %s]\n", target_pid_to_str (ecs->pid));
1872 flush_cached_frames ();
1875 if (SOFTWARE_SINGLE_STEP_P && singlestep_breakpoints_inserted_p)
1877 /* Pull the single step breakpoints out of the target. */
1878 SOFTWARE_SINGLE_STEP (0, 0);
1879 singlestep_breakpoints_inserted_p = 0;
1882 /* If PC is pointing at a nullified instruction, then step beyond
1883 it so that the user won't be confused when GDB appears to be ready
1886 /* if (INSTRUCTION_NULLIFIED && currently_stepping (ecs)) */
1887 if (INSTRUCTION_NULLIFIED)
1889 registers_changed ();
1890 target_resume (ecs->pid, 1, TARGET_SIGNAL_0);
1892 /* We may have received a signal that we want to pass to
1893 the inferior; therefore, we must not clobber the waitstatus
1896 ecs->infwait_state = infwait_nullified_state;
1897 ecs->waiton_pid = ecs->pid;
1898 ecs->wp = &(ecs->tmpstatus);
1902 /* It may not be necessary to disable the watchpoint to stop over
1903 it. For example, the PA can (with some kernel cooperation)
1904 single step over a watchpoint without disabling the watchpoint. */
1905 if (HAVE_STEPPABLE_WATCHPOINT && STOPPED_BY_WATCHPOINT (ecs->ws))
1911 /* It is far more common to need to disable a watchpoint to step
1912 the inferior over it. FIXME. What else might a debug
1913 register or page protection watchpoint scheme need here? */
1914 if (HAVE_NONSTEPPABLE_WATCHPOINT && STOPPED_BY_WATCHPOINT (ecs->ws))
1916 /* At this point, we are stopped at an instruction which has
1917 attempted to write to a piece of memory under control of
1918 a watchpoint. The instruction hasn't actually executed
1919 yet. If we were to evaluate the watchpoint expression
1920 now, we would get the old value, and therefore no change
1921 would seem to have occurred.
1923 In order to make watchpoints work `right', we really need
1924 to complete the memory write, and then evaluate the
1925 watchpoint expression. The following code does that by
1926 removing the watchpoint (actually, all watchpoints and
1927 breakpoints), single-stepping the target, re-inserting
1928 watchpoints, and then falling through to let normal
1929 single-step processing handle proceed. Since this
1930 includes evaluating watchpoints, things will come to a
1931 stop in the correct manner. */
1933 write_pc (stop_pc - DECR_PC_AFTER_BREAK);
1935 remove_breakpoints ();
1936 registers_changed ();
1937 target_resume (ecs->pid, 1, TARGET_SIGNAL_0); /* Single step */
1939 ecs->waiton_pid = ecs->pid;
1940 ecs->wp = &(ecs->ws);
1941 ecs->infwait_state = infwait_nonstep_watch_state;
1945 /* It may be possible to simply continue after a watchpoint. */
1946 if (HAVE_CONTINUABLE_WATCHPOINT)
1947 STOPPED_BY_WATCHPOINT (ecs->ws);
1949 ecs->stop_func_start = 0;
1950 ecs->stop_func_end = 0;
1951 ecs->stop_func_name = 0;
1952 /* Don't care about return value; stop_func_start and stop_func_name
1953 will both be 0 if it doesn't work. */
1954 find_pc_partial_function (stop_pc, &ecs->stop_func_name,
1955 &ecs->stop_func_start, &ecs->stop_func_end);
1956 ecs->stop_func_start += FUNCTION_START_OFFSET;
1957 ecs->another_trap = 0;
1958 bpstat_clear (&stop_bpstat);
1960 stop_stack_dummy = 0;
1961 stop_print_frame = 1;
1962 ecs->random_signal = 0;
1963 stopped_by_random_signal = 0;
1964 breakpoints_failed = 0;
1966 /* Look at the cause of the stop, and decide what to do.
1967 The alternatives are:
1968 1) break; to really stop and return to the debugger,
1969 2) drop through to start up again
1970 (set ecs->another_trap to 1 to single step once)
1971 3) set ecs->random_signal to 1, and the decision between 1 and 2
1972 will be made according to the signal handling tables. */
1974 /* First, distinguish signals caused by the debugger from signals
1975 that have to do with the program's own actions.
1976 Note that breakpoint insns may cause SIGTRAP or SIGILL
1977 or SIGEMT, depending on the operating system version.
1978 Here we detect when a SIGILL or SIGEMT is really a breakpoint
1979 and change it to SIGTRAP. */
1981 if (stop_signal == TARGET_SIGNAL_TRAP
1982 || (breakpoints_inserted &&
1983 (stop_signal == TARGET_SIGNAL_ILL
1984 || stop_signal == TARGET_SIGNAL_EMT
1986 || stop_soon_quietly)
1988 if (stop_signal == TARGET_SIGNAL_TRAP && stop_after_trap)
1990 stop_print_frame = 0;
1993 if (stop_soon_quietly)
1996 /* Don't even think about breakpoints
1997 if just proceeded over a breakpoint.
1999 However, if we are trying to proceed over a breakpoint
2000 and end up in sigtramp, then through_sigtramp_breakpoint
2001 will be set and we should check whether we've hit the
2003 if (stop_signal == TARGET_SIGNAL_TRAP && trap_expected
2004 && through_sigtramp_breakpoint == NULL)
2005 bpstat_clear (&stop_bpstat);
2008 /* See if there is a breakpoint at the current PC. */
2009 stop_bpstat = bpstat_stop_status
2011 (DECR_PC_AFTER_BREAK ?
2012 /* Notice the case of stepping through a jump
2013 that lands just after a breakpoint.
2014 Don't confuse that with hitting the breakpoint.
2015 What we check for is that 1) stepping is going on
2016 and 2) the pc before the last insn does not match
2017 the address of the breakpoint before the current pc
2018 and 3) we didn't hit a breakpoint in a signal handler
2019 without an intervening stop in sigtramp, which is
2020 detected by a new stack pointer value below
2021 any usual function calling stack adjustments. */
2022 (currently_stepping (ecs)
2023 && prev_pc != stop_pc - DECR_PC_AFTER_BREAK
2025 && INNER_THAN (read_sp (), (step_sp - 16)))) :
2028 /* Following in case break condition called a
2030 stop_print_frame = 1;
2033 if (stop_signal == TARGET_SIGNAL_TRAP)
2035 = !(bpstat_explains_signal (stop_bpstat)
2037 || (!CALL_DUMMY_BREAKPOINT_OFFSET_P
2038 && PC_IN_CALL_DUMMY (stop_pc, read_sp (),
2039 FRAME_FP (get_current_frame ())))
2040 || (step_range_end && step_resume_breakpoint == NULL));
2045 = !(bpstat_explains_signal (stop_bpstat)
2046 /* End of a stack dummy. Some systems (e.g. Sony
2047 news) give another signal besides SIGTRAP, so
2048 check here as well as above. */
2049 || (!CALL_DUMMY_BREAKPOINT_OFFSET_P
2050 && PC_IN_CALL_DUMMY (stop_pc, read_sp (),
2051 FRAME_FP (get_current_frame ())))
2053 if (!ecs->random_signal)
2054 stop_signal = TARGET_SIGNAL_TRAP;
2058 /* When we reach this point, we've pretty much decided
2059 that the reason for stopping must've been a random
2060 (unexpected) signal. */
2063 ecs->random_signal = 1;
2064 /* If a fork, vfork or exec event was seen, then there are two
2065 possible responses we can make:
2067 1. If a catchpoint triggers for the event (ecs->random_signal == 0),
2068 then we must stop now and issue a prompt. We will resume
2069 the inferior when the user tells us to.
2070 2. If no catchpoint triggers for the event (ecs->random_signal == 1),
2071 then we must resume the inferior now and keep checking.
2073 In either case, we must take appropriate steps to "follow" the
2074 the fork/vfork/exec when the inferior is resumed. For example,
2075 if follow-fork-mode is "child", then we must detach from the
2076 parent inferior and follow the new child inferior.
2078 In either case, setting pending_follow causes the next resume()
2079 to take the appropriate following action. */
2080 process_event_stop_test:
2081 if (ecs->ws.kind == TARGET_WAITKIND_FORKED)
2083 if (ecs->random_signal) /* I.e., no catchpoint triggered for this. */
2086 stop_signal = TARGET_SIGNAL_0;
2090 else if (ecs->ws.kind == TARGET_WAITKIND_VFORKED)
2092 if (ecs->random_signal) /* I.e., no catchpoint triggered for this. */
2094 stop_signal = TARGET_SIGNAL_0;
2098 else if (ecs->ws.kind == TARGET_WAITKIND_EXECD)
2100 pending_follow.kind = ecs->ws.kind;
2101 if (ecs->random_signal) /* I.e., no catchpoint triggered for this. */
2104 stop_signal = TARGET_SIGNAL_0;
2109 /* For the program's own signals, act according to
2110 the signal handling tables. */
2112 if (ecs->random_signal)
2114 /* Signal not for debugging purposes. */
2117 stopped_by_random_signal = 1;
2119 if (signal_print[stop_signal])
2122 target_terminal_ours_for_output ();
2124 printf_filtered ("\nProgram received signal ");
2125 annotate_signal_name ();
2126 printf_filtered ("%s", target_signal_to_name (stop_signal));
2127 annotate_signal_name_end ();
2128 printf_filtered (", ");
2129 annotate_signal_string ();
2130 printf_filtered ("%s", target_signal_to_string (stop_signal));
2131 annotate_signal_string_end ();
2132 printf_filtered (".\n");
2133 gdb_flush (gdb_stdout);
2135 if (signal_stop[stop_signal])
2137 /* If not going to stop, give terminal back
2138 if we took it away. */
2140 target_terminal_inferior ();
2142 /* Clear the signal if it should not be passed. */
2143 if (signal_program[stop_signal] == 0)
2144 stop_signal = TARGET_SIGNAL_0;
2146 /* If we're in the middle of a "next" command, let the code for
2147 stepping over a function handle this. pai/1997-09-10
2149 A previous comment here suggested it was possible to change
2150 this to jump to keep_going in all cases. */
2152 if (step_over_calls > 0)
2153 goto step_over_function;
2155 goto check_sigtramp2;
2158 /* Handle cases caused by hitting a breakpoint. */
2160 CORE_ADDR jmp_buf_pc;
2161 struct bpstat_what what;
2163 what = bpstat_what (stop_bpstat);
2165 if (what.call_dummy)
2167 stop_stack_dummy = 1;
2169 trap_expected_after_continue = 1;
2173 switch (what.main_action)
2175 case BPSTAT_WHAT_SET_LONGJMP_RESUME:
2176 /* If we hit the breakpoint at longjmp, disable it for the
2177 duration of this command. Then, install a temporary
2178 breakpoint at the target of the jmp_buf. */
2179 disable_longjmp_breakpoint ();
2180 remove_breakpoints ();
2181 breakpoints_inserted = 0;
2182 if (!GET_LONGJMP_TARGET (&jmp_buf_pc))
2185 /* Need to blow away step-resume breakpoint, as it
2186 interferes with us */
2187 if (step_resume_breakpoint != NULL)
2189 delete_breakpoint (step_resume_breakpoint);
2190 step_resume_breakpoint = NULL;
2192 /* Not sure whether we need to blow this away too, but probably
2193 it is like the step-resume breakpoint. */
2194 if (through_sigtramp_breakpoint != NULL)
2196 delete_breakpoint (through_sigtramp_breakpoint);
2197 through_sigtramp_breakpoint = NULL;
2201 /* FIXME - Need to implement nested temporary breakpoints */
2202 if (step_over_calls > 0)
2203 set_longjmp_resume_breakpoint (jmp_buf_pc,
2204 get_current_frame ());
2207 set_longjmp_resume_breakpoint (jmp_buf_pc, NULL);
2208 ecs->handling_longjmp = 1; /* FIXME */
2211 case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME:
2212 case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME_SINGLE:
2213 remove_breakpoints ();
2214 breakpoints_inserted = 0;
2216 /* FIXME - Need to implement nested temporary breakpoints */
2218 && (INNER_THAN (FRAME_FP (get_current_frame ()),
2219 step_frame_address)))
2221 ecs->another_trap = 1;
2225 disable_longjmp_breakpoint ();
2226 ecs->handling_longjmp = 0; /* FIXME */
2227 if (what.main_action == BPSTAT_WHAT_CLEAR_LONGJMP_RESUME)
2229 /* else fallthrough */
2231 case BPSTAT_WHAT_SINGLE:
2232 if (breakpoints_inserted)
2234 thread_step_needed = 1;
2235 remove_breakpoints ();
2237 breakpoints_inserted = 0;
2238 ecs->another_trap = 1;
2239 /* Still need to check other stuff, at least the case
2240 where we are stepping and step out of the right range. */
2243 case BPSTAT_WHAT_STOP_NOISY:
2244 stop_print_frame = 1;
2246 /* We are about to nuke the step_resume_breakpoint and
2247 through_sigtramp_breakpoint via the cleanup chain, so
2248 no need to worry about it here. */
2252 case BPSTAT_WHAT_STOP_SILENT:
2253 stop_print_frame = 0;
2255 /* We are about to nuke the step_resume_breakpoint and
2256 through_sigtramp_breakpoint via the cleanup chain, so
2257 no need to worry about it here. */
2261 case BPSTAT_WHAT_STEP_RESUME:
2262 /* This proably demands a more elegant solution, but, yeah
2265 This function's use of the simple variable
2266 step_resume_breakpoint doesn't seem to accomodate
2267 simultaneously active step-resume bp's, although the
2268 breakpoint list certainly can.
2270 If we reach here and step_resume_breakpoint is already
2271 NULL, then apparently we have multiple active
2272 step-resume bp's. We'll just delete the breakpoint we
2273 stopped at, and carry on. */
2274 if (step_resume_breakpoint == NULL)
2276 step_resume_breakpoint =
2277 bpstat_find_step_resume_breakpoint (stop_bpstat);
2279 delete_breakpoint (step_resume_breakpoint);
2280 step_resume_breakpoint = NULL;
2283 case BPSTAT_WHAT_THROUGH_SIGTRAMP:
2284 if (through_sigtramp_breakpoint)
2285 delete_breakpoint (through_sigtramp_breakpoint);
2286 through_sigtramp_breakpoint = NULL;
2288 /* If were waiting for a trap, hitting the step_resume_break
2289 doesn't count as getting it. */
2291 ecs->another_trap = 1;
2294 case BPSTAT_WHAT_CHECK_SHLIBS:
2295 case BPSTAT_WHAT_CHECK_SHLIBS_RESUME_FROM_HOOK:
2298 /* Remove breakpoints, we eventually want to step over the
2299 shlib event breakpoint, and SOLIB_ADD might adjust
2300 breakpoint addresses via breakpoint_re_set. */
2301 if (breakpoints_inserted)
2302 remove_breakpoints ();
2303 breakpoints_inserted = 0;
2305 /* Check for any newly added shared libraries if we're
2306 supposed to be adding them automatically. */
2309 /* Switch terminal for any messages produced by
2310 breakpoint_re_set. */
2311 target_terminal_ours_for_output ();
2312 SOLIB_ADD (NULL, 0, NULL);
2313 target_terminal_inferior ();
2316 /* Try to reenable shared library breakpoints, additional
2317 code segments in shared libraries might be mapped in now. */
2318 re_enable_breakpoints_in_shlibs ();
2320 /* If requested, stop when the dynamic linker notifies
2321 gdb of events. This allows the user to get control
2322 and place breakpoints in initializer routines for
2323 dynamically loaded objects (among other things). */
2324 if (stop_on_solib_events)
2326 stop_print_frame = 0;
2330 /* If we stopped due to an explicit catchpoint, then the
2331 (see above) call to SOLIB_ADD pulled in any symbols
2332 from a newly-loaded library, if appropriate.
2334 We do want the inferior to stop, but not where it is
2335 now, which is in the dynamic linker callback. Rather,
2336 we would like it stop in the user's program, just after
2337 the call that caused this catchpoint to trigger. That
2338 gives the user a more useful vantage from which to
2339 examine their program's state. */
2340 else if (what.main_action == BPSTAT_WHAT_CHECK_SHLIBS_RESUME_FROM_HOOK)
2342 /* ??rehrauer: If I could figure out how to get the
2343 right return PC from here, we could just set a temp
2344 breakpoint and resume. I'm not sure we can without
2345 cracking open the dld's shared libraries and sniffing
2346 their unwind tables and text/data ranges, and that's
2347 not a terribly portable notion.
2349 Until that time, we must step the inferior out of the
2350 dld callback, and also out of the dld itself (and any
2351 code or stubs in libdld.sl, such as "shl_load" and
2352 friends) until we reach non-dld code. At that point,
2353 we can stop stepping. */
2354 bpstat_get_triggered_catchpoints (stop_bpstat,
2355 &ecs->stepping_through_solib_catchpoints);
2356 ecs->stepping_through_solib_after_catch = 1;
2358 /* Be sure to lift all breakpoints, so the inferior does
2359 actually step past this point... */
2360 ecs->another_trap = 1;
2365 /* We want to step over this breakpoint, then keep going. */
2366 ecs->another_trap = 1;
2373 case BPSTAT_WHAT_LAST:
2374 /* Not a real code, but listed here to shut up gcc -Wall. */
2376 case BPSTAT_WHAT_KEEP_CHECKING:
2381 /* We come here if we hit a breakpoint but should not
2382 stop for it. Possibly we also were stepping
2383 and should stop for that. So fall through and
2384 test for stepping. But, if not stepping,
2387 /* Are we stepping to get the inferior out of the dynamic
2388 linker's hook (and possibly the dld itself) after catching
2390 if (ecs->stepping_through_solib_after_catch)
2392 #if defined(SOLIB_ADD)
2393 /* Have we reached our destination? If not, keep going. */
2394 if (SOLIB_IN_DYNAMIC_LINKER (ecs->pid, stop_pc))
2396 ecs->another_trap = 1;
2400 /* Else, stop and report the catchpoint(s) whose triggering
2401 caused us to begin stepping. */
2402 ecs->stepping_through_solib_after_catch = 0;
2403 bpstat_clear (&stop_bpstat);
2404 stop_bpstat = bpstat_copy (ecs->stepping_through_solib_catchpoints);
2405 bpstat_clear (&ecs->stepping_through_solib_catchpoints);
2406 stop_print_frame = 1;
2410 if (!CALL_DUMMY_BREAKPOINT_OFFSET_P)
2412 /* This is the old way of detecting the end of the stack dummy.
2413 An architecture which defines CALL_DUMMY_BREAKPOINT_OFFSET gets
2414 handled above. As soon as we can test it on all of them, all
2415 architectures should define it. */
2417 /* If this is the breakpoint at the end of a stack dummy,
2418 just stop silently, unless the user was doing an si/ni, in which
2419 case she'd better know what she's doing. */
2421 if (CALL_DUMMY_HAS_COMPLETED (stop_pc, read_sp (),
2422 FRAME_FP (get_current_frame ()))
2425 stop_print_frame = 0;
2426 stop_stack_dummy = 1;
2428 trap_expected_after_continue = 1;
2434 if (step_resume_breakpoint)
2435 /* Having a step-resume breakpoint overrides anything
2436 else having to do with stepping commands until
2437 that breakpoint is reached. */
2438 /* I'm not sure whether this needs to be check_sigtramp2 or
2439 whether it could/should be keep_going. */
2440 goto check_sigtramp2;
2442 if (step_range_end == 0)
2443 /* Likewise if we aren't even stepping. */
2444 /* I'm not sure whether this needs to be check_sigtramp2 or
2445 whether it could/should be keep_going. */
2446 goto check_sigtramp2;
2448 /* If stepping through a line, keep going if still within it.
2450 Note that step_range_end is the address of the first instruction
2451 beyond the step range, and NOT the address of the last instruction
2453 if (stop_pc >= step_range_start
2454 && stop_pc < step_range_end)
2456 /* We might be doing a BPSTAT_WHAT_SINGLE and getting a signal.
2457 So definately need to check for sigtramp here. */
2458 goto check_sigtramp2;
2461 /* We stepped out of the stepping range. */
2463 /* If we are stepping at the source level and entered the runtime
2464 loader dynamic symbol resolution code, we keep on single stepping
2465 until we exit the run time loader code and reach the callee's
2467 if (step_over_calls < 0 && IN_SOLIB_DYNSYM_RESOLVE_CODE (stop_pc))
2470 /* We can't update step_sp every time through the loop, because
2471 reading the stack pointer would slow down stepping too much.
2472 But we can update it every time we leave the step range. */
2473 ecs->update_step_sp = 1;
2475 /* Did we just take a signal? */
2476 if (IN_SIGTRAMP (stop_pc, ecs->stop_func_name)
2477 && !IN_SIGTRAMP (prev_pc, prev_func_name)
2478 && INNER_THAN (read_sp (), step_sp))
2480 /* We've just taken a signal; go until we are back to
2481 the point where we took it and one more. */
2483 /* Note: The test above succeeds not only when we stepped
2484 into a signal handler, but also when we step past the last
2485 statement of a signal handler and end up in the return stub
2486 of the signal handler trampoline. To distinguish between
2487 these two cases, check that the frame is INNER_THAN the
2488 previous one below. pai/1997-09-11 */
2492 CORE_ADDR current_frame = FRAME_FP (get_current_frame ());
2494 if (INNER_THAN (current_frame, step_frame_address))
2496 /* We have just taken a signal; go until we are back to
2497 the point where we took it and one more. */
2499 /* This code is needed at least in the following case:
2500 The user types "next" and then a signal arrives (before
2501 the "next" is done). */
2503 /* Note that if we are stopped at a breakpoint, then we need
2504 the step_resume breakpoint to override any breakpoints at
2505 the same location, so that we will still step over the
2506 breakpoint even though the signal happened. */
2507 struct symtab_and_line sr_sal;
2510 sr_sal.symtab = NULL;
2512 sr_sal.pc = prev_pc;
2513 /* We could probably be setting the frame to
2514 step_frame_address; I don't think anyone thought to
2516 step_resume_breakpoint =
2517 set_momentary_breakpoint (sr_sal, NULL, bp_step_resume);
2518 if (breakpoints_inserted)
2519 insert_breakpoints ();
2523 /* We just stepped out of a signal handler and into
2524 its calling trampoline.
2526 Normally, we'd jump to step_over_function from
2527 here, but for some reason GDB can't unwind the
2528 stack correctly to find the real PC for the point
2529 user code where the signal trampoline will return
2530 -- FRAME_SAVED_PC fails, at least on HP-UX 10.20.
2531 But signal trampolines are pretty small stubs of
2532 code, anyway, so it's OK instead to just
2533 single-step out. Note: assuming such trampolines
2534 don't exhibit recursion on any platform... */
2535 find_pc_partial_function (stop_pc, &ecs->stop_func_name,
2536 &ecs->stop_func_start,
2537 &ecs->stop_func_end);
2538 /* Readjust stepping range */
2539 step_range_start = ecs->stop_func_start;
2540 step_range_end = ecs->stop_func_end;
2541 ecs->stepping_through_sigtramp = 1;
2546 /* If this is stepi or nexti, make sure that the stepping range
2547 gets us past that instruction. */
2548 if (step_range_end == 1)
2549 /* FIXME: Does this run afoul of the code below which, if
2550 we step into the middle of a line, resets the stepping
2552 step_range_end = (step_range_start = prev_pc) + 1;
2554 ecs->remove_breakpoints_on_following_step = 1;
2558 if (stop_pc == ecs->stop_func_start /* Quick test */
2559 || (in_prologue (stop_pc, ecs->stop_func_start) &&
2560 !IN_SOLIB_RETURN_TRAMPOLINE (stop_pc, ecs->stop_func_name))
2561 || IN_SOLIB_CALL_TRAMPOLINE (stop_pc, ecs->stop_func_name)
2562 || ecs->stop_func_name == 0)
2564 /* It's a subroutine call. */
2566 if (step_over_calls == 0)
2568 /* I presume that step_over_calls is only 0 when we're
2569 supposed to be stepping at the assembly language level
2570 ("stepi"). Just stop. */
2575 if (step_over_calls > 0 || IGNORE_HELPER_CALL (stop_pc))
2576 /* We're doing a "next". */
2577 goto step_over_function;
2579 /* If we are in a function call trampoline (a stub between
2580 the calling routine and the real function), locate the real
2581 function. That's what tells us (a) whether we want to step
2582 into it at all, and (b) what prologue we want to run to
2583 the end of, if we do step into it. */
2584 tmp = SKIP_TRAMPOLINE_CODE (stop_pc);
2586 ecs->stop_func_start = tmp;
2589 tmp = DYNAMIC_TRAMPOLINE_NEXTPC (stop_pc);
2592 struct symtab_and_line xxx;
2593 /* Why isn't this s_a_l called "sr_sal", like all of the
2594 other s_a_l's where this code is duplicated? */
2595 INIT_SAL (&xxx); /* initialize to zeroes */
2597 xxx.section = find_pc_overlay (xxx.pc);
2598 step_resume_breakpoint =
2599 set_momentary_breakpoint (xxx, NULL, bp_step_resume);
2600 insert_breakpoints ();
2605 /* If we have line number information for the function we
2606 are thinking of stepping into, step into it.
2608 If there are several symtabs at that PC (e.g. with include
2609 files), just want to know whether *any* of them have line
2610 numbers. find_pc_line handles this. */
2612 struct symtab_and_line tmp_sal;
2614 tmp_sal = find_pc_line (ecs->stop_func_start, 0);
2615 if (tmp_sal.line != 0)
2616 goto step_into_function;
2620 /* A subroutine call has happened. */
2622 /* Set a special breakpoint after the return */
2623 struct symtab_and_line sr_sal;
2626 sr_sal.symtab = NULL;
2629 /* If we came here after encountering a signal in the middle of
2630 a "next", use the stashed-away previous frame pc */
2632 = stopped_by_random_signal
2634 : ADDR_BITS_REMOVE (SAVED_PC_AFTER_CALL (get_current_frame ()));
2636 step_resume_breakpoint =
2637 set_momentary_breakpoint (sr_sal,
2638 stopped_by_random_signal ?
2639 NULL : get_current_frame (),
2642 /* We've just entered a callee, and we wish to resume until
2643 it returns to the caller. Setting a step_resume bp on
2644 the return PC will catch a return from the callee.
2646 However, if the callee is recursing, we want to be
2647 careful not to catch returns of those recursive calls,
2648 but of THIS instance of the call.
2650 To do this, we set the step_resume bp's frame to our
2651 current caller's frame (step_frame_address, which is
2652 set by the "next" or "until" command, before execution
2655 But ... don't do it if we're single-stepping out of a
2656 sigtramp, because the reason we're single-stepping is
2657 precisely because unwinding is a problem (HP-UX 10.20,
2658 e.g.) and the frame address is likely to be incorrect.
2659 No danger of sigtramp recursion. */
2661 if (ecs->stepping_through_sigtramp)
2663 step_resume_breakpoint->frame = (CORE_ADDR) NULL;
2664 ecs->stepping_through_sigtramp = 0;
2666 else if (!IN_SOLIB_DYNSYM_RESOLVE_CODE (sr_sal.pc))
2667 step_resume_breakpoint->frame = step_frame_address;
2669 if (breakpoints_inserted)
2670 insert_breakpoints ();
2675 /* Subroutine call with source code we should not step over.
2676 Do step to the first line of code in it. */
2680 s = find_pc_symtab (stop_pc);
2681 if (s && s->language != language_asm)
2682 ecs->stop_func_start = SKIP_PROLOGUE (ecs->stop_func_start);
2684 ecs->sal = find_pc_line (ecs->stop_func_start, 0);
2685 /* Use the step_resume_break to step until
2686 the end of the prologue, even if that involves jumps
2687 (as it seems to on the vax under 4.2). */
2688 /* If the prologue ends in the middle of a source line,
2689 continue to the end of that source line (if it is still
2690 within the function). Otherwise, just go to end of prologue. */
2691 #ifdef PROLOGUE_FIRSTLINE_OVERLAP
2692 /* no, don't either. It skips any code that's
2693 legitimately on the first line. */
2695 if (ecs->sal.end && ecs->sal.pc != ecs->stop_func_start && ecs->sal.end < ecs->stop_func_end)
2696 ecs->stop_func_start = ecs->sal.end;
2699 if (ecs->stop_func_start == stop_pc)
2701 /* We are already there: stop now. */
2706 /* Put the step-breakpoint there and go until there. */
2708 struct symtab_and_line sr_sal;
2710 INIT_SAL (&sr_sal); /* initialize to zeroes */
2711 sr_sal.pc = ecs->stop_func_start;
2712 sr_sal.section = find_pc_overlay (ecs->stop_func_start);
2713 /* Do not specify what the fp should be when we stop
2714 since on some machines the prologue
2715 is where the new fp value is established. */
2716 step_resume_breakpoint =
2717 set_momentary_breakpoint (sr_sal, NULL, bp_step_resume);
2718 if (breakpoints_inserted)
2719 insert_breakpoints ();
2721 /* And make sure stepping stops right away then. */
2722 step_range_end = step_range_start;
2727 /* We've wandered out of the step range. */
2729 ecs->sal = find_pc_line (stop_pc, 0);
2731 if (step_range_end == 1)
2733 /* It is stepi or nexti. We always want to stop stepping after
2739 /* If we're in the return path from a shared library trampoline,
2740 we want to proceed through the trampoline when stepping. */
2741 if (IN_SOLIB_RETURN_TRAMPOLINE (stop_pc, ecs->stop_func_name))
2745 /* Determine where this trampoline returns. */
2746 tmp = SKIP_TRAMPOLINE_CODE (stop_pc);
2748 /* Only proceed through if we know where it's going. */
2751 /* And put the step-breakpoint there and go until there. */
2752 struct symtab_and_line sr_sal;
2754 INIT_SAL (&sr_sal); /* initialize to zeroes */
2756 sr_sal.section = find_pc_overlay (sr_sal.pc);
2757 /* Do not specify what the fp should be when we stop
2758 since on some machines the prologue
2759 is where the new fp value is established. */
2760 step_resume_breakpoint =
2761 set_momentary_breakpoint (sr_sal, NULL, bp_step_resume);
2762 if (breakpoints_inserted)
2763 insert_breakpoints ();
2765 /* Restart without fiddling with the step ranges or
2771 if (ecs->sal.line == 0)
2773 /* We have no line number information. That means to stop
2774 stepping (does this always happen right after one instruction,
2775 when we do "s" in a function with no line numbers,
2776 or can this happen as a result of a return or longjmp?). */
2781 if ((stop_pc == ecs->sal.pc)
2782 && (ecs->current_line != ecs->sal.line || ecs->current_symtab != ecs->sal.symtab))
2784 /* We are at the start of a different line. So stop. Note that
2785 we don't stop if we step into the middle of a different line.
2786 That is said to make things like for (;;) statements work
2792 /* We aren't done stepping.
2794 Optimize by setting the stepping range to the line.
2795 (We might not be in the original line, but if we entered a
2796 new line in mid-statement, we continue stepping. This makes
2797 things like for(;;) statements work better.) */
2799 if (ecs->stop_func_end && ecs->sal.end >= ecs->stop_func_end)
2801 /* If this is the last line of the function, don't keep stepping
2802 (it would probably step us out of the function).
2803 This is particularly necessary for a one-line function,
2804 in which after skipping the prologue we better stop even though
2805 we will be in mid-line. */
2809 step_range_start = ecs->sal.pc;
2810 step_range_end = ecs->sal.end;
2811 step_frame_address = FRAME_FP (get_current_frame ());
2812 ecs->current_line = ecs->sal.line;
2813 ecs->current_symtab = ecs->sal.symtab;
2815 /* In the case where we just stepped out of a function into the middle
2816 of a line of the caller, continue stepping, but step_frame_address
2817 must be modified to current frame */
2819 CORE_ADDR current_frame = FRAME_FP (get_current_frame ());
2820 if (!(INNER_THAN (current_frame, step_frame_address)))
2821 step_frame_address = current_frame;
2829 && IN_SIGTRAMP (stop_pc, ecs->stop_func_name)
2830 && !IN_SIGTRAMP (prev_pc, prev_func_name)
2831 && INNER_THAN (read_sp (), step_sp))
2833 /* What has happened here is that we have just stepped the inferior
2834 with a signal (because it is a signal which shouldn't make
2835 us stop), thus stepping into sigtramp.
2837 So we need to set a step_resume_break_address breakpoint
2838 and continue until we hit it, and then step. FIXME: This should
2839 be more enduring than a step_resume breakpoint; we should know
2840 that we will later need to keep going rather than re-hitting
2841 the breakpoint here (see testsuite/gdb.t06/signals.exp where
2842 it says "exceedingly difficult"). */
2843 struct symtab_and_line sr_sal;
2845 INIT_SAL (&sr_sal); /* initialize to zeroes */
2846 sr_sal.pc = prev_pc;
2847 sr_sal.section = find_pc_overlay (sr_sal.pc);
2848 /* We perhaps could set the frame if we kept track of what
2849 the frame corresponding to prev_pc was. But we don't,
2851 through_sigtramp_breakpoint =
2852 set_momentary_breakpoint (sr_sal, NULL, bp_through_sigtramp);
2853 if (breakpoints_inserted)
2854 insert_breakpoints ();
2856 ecs->remove_breakpoints_on_following_step = 1;
2857 ecs->another_trap = 1;
2861 /* Come to this label when you need to resume the inferior.
2862 It's really much cleaner to do a goto than a maze of if-else
2865 /* ??rehrauer: ttrace on HP-UX theoretically allows one to debug
2866 a vforked child beetween its creation and subsequent exit or
2867 call to exec(). However, I had big problems in this rather
2868 creaky exec engine, getting that to work. The fundamental
2869 problem is that I'm trying to debug two processes via an
2870 engine that only understands a single process with possibly
2873 Hence, this spot is known to have problems when
2874 target_can_follow_vfork_prior_to_exec returns 1. */
2876 /* Save the pc before execution, to compare with pc after stop. */
2877 prev_pc = read_pc (); /* Might have been DECR_AFTER_BREAK */
2878 prev_func_start = ecs->stop_func_start; /* Ok, since if DECR_PC_AFTER
2879 BREAK is defined, the
2880 original pc would not have
2881 been at the start of a
2883 prev_func_name = ecs->stop_func_name;
2885 if (ecs->update_step_sp)
2886 step_sp = read_sp ();
2887 ecs->update_step_sp = 0;
2889 /* If we did not do break;, it means we should keep
2890 running the inferior and not return to debugger. */
2892 if (trap_expected && stop_signal != TARGET_SIGNAL_TRAP)
2894 /* We took a signal (which we are supposed to pass through to
2895 the inferior, else we'd have done a break above) and we
2896 haven't yet gotten our trap. Simply continue. */
2897 resume (currently_stepping (ecs), stop_signal);
2901 /* Either the trap was not expected, but we are continuing
2902 anyway (the user asked that this signal be passed to the
2905 The signal was SIGTRAP, e.g. it was our signal, but we
2906 decided we should resume from it.
2908 We're going to run this baby now!
2910 Insert breakpoints now, unless we are trying
2911 to one-proceed past a breakpoint. */
2912 /* If we've just finished a special step resume and we don't
2913 want to hit a breakpoint, pull em out. */
2914 if (step_resume_breakpoint == NULL
2915 && through_sigtramp_breakpoint == NULL
2916 && ecs->remove_breakpoints_on_following_step)
2918 ecs->remove_breakpoints_on_following_step = 0;
2919 remove_breakpoints ();
2920 breakpoints_inserted = 0;
2922 else if (!breakpoints_inserted &&
2923 (through_sigtramp_breakpoint != NULL || !ecs->another_trap))
2925 breakpoints_failed = insert_breakpoints ();
2926 if (breakpoints_failed)
2928 breakpoints_inserted = 1;
2931 trap_expected = ecs->another_trap;
2933 /* Do not deliver SIGNAL_TRAP (except when the user
2934 explicitly specifies that such a signal should be
2935 delivered to the target program).
2937 Typically, this would occure when a user is debugging a
2938 target monitor on a simulator: the target monitor sets a
2939 breakpoint; the simulator encounters this break-point and
2940 halts the simulation handing control to GDB; GDB, noteing
2941 that the break-point isn't valid, returns control back to
2942 the simulator; the simulator then delivers the hardware
2943 equivalent of a SIGNAL_TRAP to the program being
2946 if (stop_signal == TARGET_SIGNAL_TRAP
2947 && !signal_program[stop_signal])
2948 stop_signal = TARGET_SIGNAL_0;
2950 #ifdef SHIFT_INST_REGS
2951 /* I'm not sure when this following segment applies. I do know,
2952 now, that we shouldn't rewrite the regs when we were stopped
2953 by a random signal from the inferior process. */
2954 /* FIXME: Shouldn't this be based on the valid bit of the SXIP?
2955 (this is only used on the 88k). */
2957 if (!bpstat_explains_signal (stop_bpstat)
2958 && (stop_signal != TARGET_SIGNAL_CHLD)
2959 && !stopped_by_random_signal)
2961 #endif /* SHIFT_INST_REGS */
2963 resume (currently_stepping (ecs), stop_signal);
2966 /* Former continues in the main loop goto here. */
2968 /* This used to be at the top of the loop. */
2969 if (ecs->infwait_state == infwait_normal_state)
2971 overlay_cache_invalid = 1;
2973 /* We have to invalidate the registers BEFORE calling
2974 target_wait because they can be loaded from the target
2975 while in target_wait. This makes remote debugging a bit
2976 more efficient for those targets that provide critical
2977 registers as part of their normal status mechanism. */
2979 registers_changed ();
2980 ecs->waiton_pid = -1;
2981 ecs->wp = &(ecs->ws);
2983 /* This is the old end of the while loop. Let everybody know
2984 we want to wait for the inferior some more and get called
2986 ecs->wait_some_more = 1;
2990 /* Former breaks in the main loop goto here. */
2994 if (target_has_execution)
2996 /* Are we stopping for a vfork event? We only stop when we see
2997 the child's event. However, we may not yet have seen the
2998 parent's event. And, inferior_pid is still set to the parent's
2999 pid, until we resume again and follow either the parent or child.
3001 To ensure that we can really touch inferior_pid (aka, the
3002 parent process) -- which calls to functions like read_pc
3003 implicitly do -- wait on the parent if necessary. */
3004 if ((pending_follow.kind == TARGET_WAITKIND_VFORKED)
3005 && !pending_follow.fork_event.saw_parent_fork)
3011 if (target_wait_hook)
3012 parent_pid = target_wait_hook (-1, &(ecs->ws));
3014 parent_pid = target_wait (-1, &(ecs->ws));
3016 while (parent_pid != inferior_pid);
3019 /* Assuming the inferior still exists, set these up for next
3020 time, just like we did above if we didn't break out of the
3022 prev_pc = read_pc ();
3023 prev_func_start = ecs->stop_func_start;
3024 prev_func_name = ecs->stop_func_name;
3026 /* Let callers know we don't want to wait for the inferior anymore. */
3027 ecs->wait_some_more = 0;
3030 /* Are we in the middle of stepping? */
3033 currently_stepping (ecs)
3034 struct execution_control_state *ecs;
3036 return ((through_sigtramp_breakpoint == NULL
3037 && !ecs->handling_longjmp
3038 && ((step_range_end && step_resume_breakpoint == NULL)
3040 || ecs->stepping_through_solib_after_catch
3041 || bpstat_should_step ());
3044 /* This function returns TRUE if ep is an internal breakpoint
3045 set to catch generic shared library (aka dynamically-linked
3046 library) events. (This is *NOT* the same as a catchpoint for a
3047 shlib event. The latter is something a user can set; this is
3048 something gdb sets for its own use, and isn't ever shown to a
3051 is_internal_shlib_eventpoint (ep)
3052 struct breakpoint *ep;
3055 (ep->type == bp_shlib_event)
3059 /* This function returns TRUE if bs indicates that the inferior
3060 stopped due to a shared library (aka dynamically-linked library)
3063 stopped_for_internal_shlib_event (bs)
3066 /* Note that multiple eventpoints may've caused the stop. Any
3067 that are associated with shlib events will be accepted. */
3068 for (; bs != NULL; bs = bs->next)
3070 if ((bs->breakpoint_at != NULL)
3071 && is_internal_shlib_eventpoint (bs->breakpoint_at))
3075 /* If we get here, then no candidate was found. */
3079 /* This function returns TRUE if bs indicates that the inferior
3080 stopped due to a shared library (aka dynamically-linked library)
3081 event caught by a catchpoint.
3083 If TRUE, cp_p is set to point to the catchpoint.
3085 Else, the value of cp_p is undefined. */
3087 stopped_for_shlib_catchpoint (bs, cp_p)
3089 struct breakpoint **cp_p;
3091 /* Note that multiple eventpoints may've caused the stop. Any
3092 that are associated with shlib events will be accepted. */
3095 for (; bs != NULL; bs = bs->next)
3097 if ((bs->breakpoint_at != NULL)
3098 && ep_is_shlib_catchpoint (bs->breakpoint_at))
3100 *cp_p = bs->breakpoint_at;
3105 /* If we get here, then no candidate was found. */
3110 /* Reset proper settings after an asynchronous command has finished.
3111 If the execution command was in synchronous mode, register stdin
3112 with the event loop, and reset the prompt. */
3114 complete_execution ()
3116 extern cleanup_sigint_signal_handler PARAMS ((void));
3118 target_executing = 0;
3121 add_file_handler (input_fd, (file_handler_func *) call_readline, 0);
3124 cleanup_sigint_signal_handler ();
3125 display_gdb_prompt (0);
3129 /* Here to return control to GDB when the inferior stops for real.
3130 Print appropriate messages, remove breakpoints, give terminal our modes.
3132 STOP_PRINT_FRAME nonzero means print the executing frame
3133 (pc, function, args, file, line number and line text).
3134 BREAKPOINTS_FAILED nonzero means stop was due to error
3135 attempting to insert breakpoints. */
3140 /* As with the notification of thread events, we want to delay
3141 notifying the user that we've switched thread context until
3142 the inferior actually stops.
3144 (Note that there's no point in saying anything if the inferior
3146 if (may_switch_from_inferior_pid
3147 && (switched_from_inferior_pid != inferior_pid)
3148 && target_has_execution)
3150 target_terminal_ours_for_output ();
3151 printf_filtered ("[Switched to %s]\n",
3152 target_pid_or_tid_to_str (inferior_pid));
3153 switched_from_inferior_pid = inferior_pid;
3156 /* Make sure that the current_frame's pc is correct. This
3157 is a correction for setting up the frame info before doing
3158 DECR_PC_AFTER_BREAK */
3159 if (target_has_execution && get_current_frame ())
3160 (get_current_frame ())->pc = read_pc ();
3162 if (breakpoints_failed)
3164 target_terminal_ours_for_output ();
3165 print_sys_errmsg ("ptrace", breakpoints_failed);
3166 printf_filtered ("Stopped; cannot insert breakpoints.\n\
3167 The same program may be running in another process.\n");
3170 if (target_has_execution && breakpoints_inserted)
3172 if (remove_breakpoints ())
3174 target_terminal_ours_for_output ();
3175 printf_filtered ("Cannot remove breakpoints because ");
3176 printf_filtered ("program is no longer writable.\n");
3177 printf_filtered ("It might be running in another process.\n");
3178 printf_filtered ("Further execution is probably impossible.\n");
3181 breakpoints_inserted = 0;
3183 /* Delete the breakpoint we stopped at, if it wants to be deleted.
3184 Delete any breakpoint that is to be deleted at the next stop. */
3186 breakpoint_auto_delete (stop_bpstat);
3188 /* If an auto-display called a function and that got a signal,
3189 delete that auto-display to avoid an infinite recursion. */
3191 if (stopped_by_random_signal)
3192 disable_current_display ();
3194 /* Don't print a message if in the middle of doing a "step n"
3195 operation for n > 1 */
3196 if (step_multi && stop_step)
3199 target_terminal_ours ();
3201 /* Did we stop because the user set the stop_on_solib_events
3202 variable? (If so, we report this as a generic, "Stopped due
3203 to shlib event" message.) */
3204 if (stopped_for_internal_shlib_event (stop_bpstat))
3206 printf_filtered ("Stopped due to shared library event\n");
3209 /* Look up the hook_stop and run it if it exists. */
3211 if (stop_command && stop_command->hook)
3213 catch_errors (hook_stop_stub, stop_command->hook,
3214 "Error while running hook_stop:\n", RETURN_MASK_ALL);
3217 if (!target_has_stack)
3223 /* Select innermost stack frame - i.e., current frame is frame 0,
3224 and current location is based on that.
3225 Don't do this on return from a stack dummy routine,
3226 or if the program has exited. */
3228 if (!stop_stack_dummy)
3230 select_frame (get_current_frame (), 0);
3232 /* Print current location without a level number, if
3233 we have changed functions or hit a breakpoint.
3234 Print source line if we have one.
3235 bpstat_print() contains the logic deciding in detail
3236 what to print, based on the event(s) that just occurred. */
3238 if (stop_print_frame)
3243 bpstat_ret = bpstat_print (stop_bpstat);
3244 /* bpstat_print() returned one of:
3245 -1: Didn't print anything
3246 0: Printed preliminary "Breakpoint n, " message, desires
3248 1: Printed something, don't tack on location */
3250 if (bpstat_ret == -1)
3252 && step_frame_address == FRAME_FP (get_current_frame ())
3253 && step_start_function == find_pc_function (stop_pc))
3254 source_flag = -1; /* finished step, just print source line */
3256 source_flag = 1; /* print location and source line */
3257 else if (bpstat_ret == 0) /* hit bpt, desire location */
3258 source_flag = 1; /* print location and source line */
3259 else /* bpstat_ret == 1, hit bpt, do not desire location */
3260 source_flag = -1; /* just print source line */
3262 /* The behavior of this routine with respect to the source
3264 -1: Print only source line
3265 0: Print only location
3266 1: Print location and source line */
3267 show_and_print_stack_frame (selected_frame, -1, source_flag);
3269 /* Display the auto-display expressions. */
3274 /* Save the function value return registers, if we care.
3275 We might be about to restore their previous contents. */
3276 if (proceed_to_finish)
3277 read_register_bytes (0, stop_registers, REGISTER_BYTES);
3279 if (stop_stack_dummy)
3281 /* Pop the empty frame that contains the stack dummy.
3282 POP_FRAME ends with a setting of the current frame, so we
3283 can use that next. */
3285 /* Set stop_pc to what it was before we called the function.
3286 Can't rely on restore_inferior_status because that only gets
3287 called if we don't stop in the called function. */
3288 stop_pc = read_pc ();
3289 select_frame (get_current_frame (), 0);
3293 TUIDO (((TuiOpaqueFuncPtr) tui_vCheckDataValues, selected_frame));
3296 annotate_stopped ();
3300 hook_stop_stub (cmd)
3303 execute_user_command ((struct cmd_list_element *) cmd, 0);
3308 signal_stop_state (signo)
3311 return signal_stop[signo];
3315 signal_print_state (signo)
3318 return signal_print[signo];
3322 signal_pass_state (signo)
3325 return signal_program[signo];
3332 Signal Stop\tPrint\tPass to program\tDescription\n");
3336 sig_print_info (oursig)
3337 enum target_signal oursig;
3339 char *name = target_signal_to_name (oursig);
3340 int name_padding = 13 - strlen (name);
3341 if (name_padding <= 0)
3344 printf_filtered ("%s", name);
3345 printf_filtered ("%*.*s ", name_padding, name_padding,
3347 printf_filtered ("%s\t", signal_stop[oursig] ? "Yes" : "No");
3348 printf_filtered ("%s\t", signal_print[oursig] ? "Yes" : "No");
3349 printf_filtered ("%s\t\t", signal_program[oursig] ? "Yes" : "No");
3350 printf_filtered ("%s\n", target_signal_to_string (oursig));
3353 /* Specify how various signals in the inferior should be handled. */
3356 handle_command (args, from_tty)
3361 int digits, wordlen;
3362 int sigfirst, signum, siglast;
3363 enum target_signal oursig;
3366 unsigned char *sigs;
3367 struct cleanup *old_chain;
3371 error_no_arg ("signal to handle");
3374 /* Allocate and zero an array of flags for which signals to handle. */
3376 nsigs = (int) TARGET_SIGNAL_LAST;
3377 sigs = (unsigned char *) alloca (nsigs);
3378 memset (sigs, 0, nsigs);
3380 /* Break the command line up into args. */
3382 argv = buildargv (args);
3387 old_chain = make_cleanup_freeargv (argv);
3389 /* Walk through the args, looking for signal oursigs, signal names, and
3390 actions. Signal numbers and signal names may be interspersed with
3391 actions, with the actions being performed for all signals cumulatively
3392 specified. Signal ranges can be specified as <LOW>-<HIGH>. */
3394 while (*argv != NULL)
3396 wordlen = strlen (*argv);
3397 for (digits = 0; isdigit ((*argv)[digits]); digits++)
3401 sigfirst = siglast = -1;
3403 if (wordlen >= 1 && !strncmp (*argv, "all", wordlen))
3405 /* Apply action to all signals except those used by the
3406 debugger. Silently skip those. */
3409 siglast = nsigs - 1;
3411 else if (wordlen >= 1 && !strncmp (*argv, "stop", wordlen))
3413 SET_SIGS (nsigs, sigs, signal_stop);
3414 SET_SIGS (nsigs, sigs, signal_print);
3416 else if (wordlen >= 1 && !strncmp (*argv, "ignore", wordlen))
3418 UNSET_SIGS (nsigs, sigs, signal_program);
3420 else if (wordlen >= 2 && !strncmp (*argv, "print", wordlen))
3422 SET_SIGS (nsigs, sigs, signal_print);
3424 else if (wordlen >= 2 && !strncmp (*argv, "pass", wordlen))
3426 SET_SIGS (nsigs, sigs, signal_program);
3428 else if (wordlen >= 3 && !strncmp (*argv, "nostop", wordlen))
3430 UNSET_SIGS (nsigs, sigs, signal_stop);
3432 else if (wordlen >= 3 && !strncmp (*argv, "noignore", wordlen))
3434 SET_SIGS (nsigs, sigs, signal_program);
3436 else if (wordlen >= 4 && !strncmp (*argv, "noprint", wordlen))
3438 UNSET_SIGS (nsigs, sigs, signal_print);
3439 UNSET_SIGS (nsigs, sigs, signal_stop);
3441 else if (wordlen >= 4 && !strncmp (*argv, "nopass", wordlen))
3443 UNSET_SIGS (nsigs, sigs, signal_program);
3445 else if (digits > 0)
3447 /* It is numeric. The numeric signal refers to our own
3448 internal signal numbering from target.h, not to host/target
3449 signal number. This is a feature; users really should be
3450 using symbolic names anyway, and the common ones like
3451 SIGHUP, SIGINT, SIGALRM, etc. will work right anyway. */
3453 sigfirst = siglast = (int)
3454 target_signal_from_command (atoi (*argv));
3455 if ((*argv)[digits] == '-')
3458 target_signal_from_command (atoi ((*argv) + digits + 1));
3460 if (sigfirst > siglast)
3462 /* Bet he didn't figure we'd think of this case... */
3470 oursig = target_signal_from_name (*argv);
3471 if (oursig != TARGET_SIGNAL_UNKNOWN)
3473 sigfirst = siglast = (int) oursig;
3477 /* Not a number and not a recognized flag word => complain. */
3478 error ("Unrecognized or ambiguous flag word: \"%s\".", *argv);
3482 /* If any signal numbers or symbol names were found, set flags for
3483 which signals to apply actions to. */
3485 for (signum = sigfirst; signum >= 0 && signum <= siglast; signum++)
3487 switch ((enum target_signal) signum)
3489 case TARGET_SIGNAL_TRAP:
3490 case TARGET_SIGNAL_INT:
3491 if (!allsigs && !sigs[signum])
3493 if (query ("%s is used by the debugger.\n\
3494 Are you sure you want to change it? ",
3495 target_signal_to_name
3496 ((enum target_signal) signum)))
3502 printf_unfiltered ("Not confirmed, unchanged.\n");
3503 gdb_flush (gdb_stdout);
3507 case TARGET_SIGNAL_0:
3508 case TARGET_SIGNAL_DEFAULT:
3509 case TARGET_SIGNAL_UNKNOWN:
3510 /* Make sure that "all" doesn't print these. */
3521 target_notice_signals (inferior_pid);
3525 /* Show the results. */
3526 sig_print_header ();
3527 for (signum = 0; signum < nsigs; signum++)
3531 sig_print_info (signum);
3536 do_cleanups (old_chain);
3540 xdb_handle_command (args, from_tty)
3545 struct cleanup *old_chain;
3547 /* Break the command line up into args. */
3549 argv = buildargv (args);
3554 old_chain = make_cleanup_freeargv (argv);
3555 if (argv[1] != (char *) NULL)
3560 bufLen = strlen (argv[0]) + 20;
3561 argBuf = (char *) xmalloc (bufLen);
3565 enum target_signal oursig;
3567 oursig = target_signal_from_name (argv[0]);
3568 memset (argBuf, 0, bufLen);
3569 if (strcmp (argv[1], "Q") == 0)
3570 sprintf (argBuf, "%s %s", argv[0], "noprint");
3573 if (strcmp (argv[1], "s") == 0)
3575 if (!signal_stop[oursig])
3576 sprintf (argBuf, "%s %s", argv[0], "stop");
3578 sprintf (argBuf, "%s %s", argv[0], "nostop");
3580 else if (strcmp (argv[1], "i") == 0)
3582 if (!signal_program[oursig])
3583 sprintf (argBuf, "%s %s", argv[0], "pass");
3585 sprintf (argBuf, "%s %s", argv[0], "nopass");
3587 else if (strcmp (argv[1], "r") == 0)
3589 if (!signal_print[oursig])
3590 sprintf (argBuf, "%s %s", argv[0], "print");
3592 sprintf (argBuf, "%s %s", argv[0], "noprint");
3598 handle_command (argBuf, from_tty);
3600 printf_filtered ("Invalid signal handling flag.\n");
3605 do_cleanups (old_chain);
3608 /* Print current contents of the tables set by the handle command.
3609 It is possible we should just be printing signals actually used
3610 by the current target (but for things to work right when switching
3611 targets, all signals should be in the signal tables). */
3614 signals_info (signum_exp, from_tty)
3618 enum target_signal oursig;
3619 sig_print_header ();
3623 /* First see if this is a symbol name. */
3624 oursig = target_signal_from_name (signum_exp);
3625 if (oursig == TARGET_SIGNAL_UNKNOWN)
3627 /* No, try numeric. */
3629 target_signal_from_command (parse_and_eval_address (signum_exp));
3631 sig_print_info (oursig);
3635 printf_filtered ("\n");
3636 /* These ugly casts brought to you by the native VAX compiler. */
3637 for (oursig = TARGET_SIGNAL_FIRST;
3638 (int) oursig < (int) TARGET_SIGNAL_LAST;
3639 oursig = (enum target_signal) ((int) oursig + 1))
3643 if (oursig != TARGET_SIGNAL_UNKNOWN
3644 && oursig != TARGET_SIGNAL_DEFAULT
3645 && oursig != TARGET_SIGNAL_0)
3646 sig_print_info (oursig);
3649 printf_filtered ("\nUse the \"handle\" command to change these tables.\n");
3652 struct inferior_status
3654 enum target_signal stop_signal;
3658 int stop_stack_dummy;
3659 int stopped_by_random_signal;
3661 CORE_ADDR step_range_start;
3662 CORE_ADDR step_range_end;
3663 CORE_ADDR step_frame_address;
3664 int step_over_calls;
3665 CORE_ADDR step_resume_break_address;
3666 int stop_after_trap;
3667 int stop_soon_quietly;
3668 CORE_ADDR selected_frame_address;
3669 char *stop_registers;
3671 /* These are here because if call_function_by_hand has written some
3672 registers and then decides to call error(), we better not have changed
3677 int breakpoint_proceeded;
3678 int restore_stack_info;
3679 int proceed_to_finish;
3683 static struct inferior_status *xmalloc_inferior_status PARAMS ((void));
3684 static struct inferior_status *
3685 xmalloc_inferior_status ()
3687 struct inferior_status *inf_status;
3688 inf_status = xmalloc (sizeof (struct inferior_status));
3689 inf_status->stop_registers = xmalloc (REGISTER_BYTES);
3690 inf_status->registers = xmalloc (REGISTER_BYTES);
3694 static void free_inferior_status PARAMS ((struct inferior_status *));
3696 free_inferior_status (inf_status)
3697 struct inferior_status *inf_status;
3699 free (inf_status->registers);
3700 free (inf_status->stop_registers);
3705 write_inferior_status_register (inf_status, regno, val)
3706 struct inferior_status *inf_status;
3710 int size = REGISTER_RAW_SIZE (regno);
3711 void *buf = alloca (size);
3712 store_signed_integer (buf, size, val);
3713 memcpy (&inf_status->registers[REGISTER_BYTE (regno)], buf, size);
3718 /* Save all of the information associated with the inferior<==>gdb
3719 connection. INF_STATUS is a pointer to a "struct inferior_status"
3720 (defined in inferior.h). */
3722 struct inferior_status *
3723 save_inferior_status (restore_stack_info)
3724 int restore_stack_info;
3726 struct inferior_status *inf_status = xmalloc_inferior_status ();
3728 inf_status->stop_signal = stop_signal;
3729 inf_status->stop_pc = stop_pc;
3730 inf_status->stop_step = stop_step;
3731 inf_status->stop_stack_dummy = stop_stack_dummy;
3732 inf_status->stopped_by_random_signal = stopped_by_random_signal;
3733 inf_status->trap_expected = trap_expected;
3734 inf_status->step_range_start = step_range_start;
3735 inf_status->step_range_end = step_range_end;
3736 inf_status->step_frame_address = step_frame_address;
3737 inf_status->step_over_calls = step_over_calls;
3738 inf_status->stop_after_trap = stop_after_trap;
3739 inf_status->stop_soon_quietly = stop_soon_quietly;
3740 /* Save original bpstat chain here; replace it with copy of chain.
3741 If caller's caller is walking the chain, they'll be happier if we
3742 hand them back the original chain when restore_inferior_status is
3744 inf_status->stop_bpstat = stop_bpstat;
3745 stop_bpstat = bpstat_copy (stop_bpstat);
3746 inf_status->breakpoint_proceeded = breakpoint_proceeded;
3747 inf_status->restore_stack_info = restore_stack_info;
3748 inf_status->proceed_to_finish = proceed_to_finish;
3750 memcpy (inf_status->stop_registers, stop_registers, REGISTER_BYTES);
3752 read_register_bytes (0, inf_status->registers, REGISTER_BYTES);
3754 record_selected_frame (&(inf_status->selected_frame_address),
3755 &(inf_status->selected_level));
3759 struct restore_selected_frame_args
3761 CORE_ADDR frame_address;
3765 static int restore_selected_frame PARAMS ((PTR));
3768 restore_selected_frame (args)
3771 struct restore_selected_frame_args *fr =
3772 (struct restore_selected_frame_args *) args;
3773 struct frame_info *frame;
3774 int level = fr->level;
3776 frame = find_relative_frame (get_current_frame (), &level);
3778 /* If inf_status->selected_frame_address is NULL, there was no
3779 previously selected frame. */
3780 if (frame == NULL ||
3781 /* FRAME_FP (frame) != fr->frame_address || */
3782 /* elz: deleted this check as a quick fix to the problem that
3783 for function called by hand gdb creates no internal frame
3784 structure and the real stack and gdb's idea of stack are
3785 different if nested calls by hands are made.
3787 mvs: this worries me. */
3790 warning ("Unable to restore previously selected frame.\n");
3794 select_frame (frame, fr->level);
3800 restore_inferior_status (inf_status)
3801 struct inferior_status *inf_status;
3803 stop_signal = inf_status->stop_signal;
3804 stop_pc = inf_status->stop_pc;
3805 stop_step = inf_status->stop_step;
3806 stop_stack_dummy = inf_status->stop_stack_dummy;
3807 stopped_by_random_signal = inf_status->stopped_by_random_signal;
3808 trap_expected = inf_status->trap_expected;
3809 step_range_start = inf_status->step_range_start;
3810 step_range_end = inf_status->step_range_end;
3811 step_frame_address = inf_status->step_frame_address;
3812 step_over_calls = inf_status->step_over_calls;
3813 stop_after_trap = inf_status->stop_after_trap;
3814 stop_soon_quietly = inf_status->stop_soon_quietly;
3815 bpstat_clear (&stop_bpstat);
3816 stop_bpstat = inf_status->stop_bpstat;
3817 breakpoint_proceeded = inf_status->breakpoint_proceeded;
3818 proceed_to_finish = inf_status->proceed_to_finish;
3820 /* FIXME: Is the restore of stop_registers always needed */
3821 memcpy (stop_registers, inf_status->stop_registers, REGISTER_BYTES);
3823 /* The inferior can be gone if the user types "print exit(0)"
3824 (and perhaps other times). */
3825 if (target_has_execution)
3826 write_register_bytes (0, inf_status->registers, REGISTER_BYTES);
3828 /* FIXME: If we are being called after stopping in a function which
3829 is called from gdb, we should not be trying to restore the
3830 selected frame; it just prints a spurious error message (The
3831 message is useful, however, in detecting bugs in gdb (like if gdb
3832 clobbers the stack)). In fact, should we be restoring the
3833 inferior status at all in that case? . */
3835 if (target_has_stack && inf_status->restore_stack_info)
3837 struct restore_selected_frame_args fr;
3838 fr.level = inf_status->selected_level;
3839 fr.frame_address = inf_status->selected_frame_address;
3840 /* The point of catch_errors is that if the stack is clobbered,
3841 walking the stack might encounter a garbage pointer and error()
3842 trying to dereference it. */
3843 if (catch_errors (restore_selected_frame, &fr,
3844 "Unable to restore previously selected frame:\n",
3845 RETURN_MASK_ERROR) == 0)
3846 /* Error in restoring the selected frame. Select the innermost
3850 select_frame (get_current_frame (), 0);
3854 free_inferior_status (inf_status);
3858 discard_inferior_status (inf_status)
3859 struct inferior_status *inf_status;
3861 /* See save_inferior_status for info on stop_bpstat. */
3862 bpstat_clear (&inf_status->stop_bpstat);
3863 free_inferior_status (inf_status);
3867 set_follow_fork_mode_command (arg, from_tty, c)
3870 struct cmd_list_element *c;
3872 if (!STREQ (arg, "parent") &&
3873 !STREQ (arg, "child") &&
3874 !STREQ (arg, "both") &&
3875 !STREQ (arg, "ask"))
3876 error ("follow-fork-mode must be one of \"parent\", \"child\", \"both\" or \"ask\".");
3878 if (follow_fork_mode_string != NULL)
3879 free (follow_fork_mode_string);
3880 follow_fork_mode_string = savestring (arg, strlen (arg));
3885 static void build_infrun PARAMS ((void));
3889 stop_registers = xmalloc (REGISTER_BYTES);
3894 _initialize_infrun ()
3897 register int numsigs;
3898 struct cmd_list_element *c;
3902 register_gdbarch_swap (&stop_registers, sizeof (stop_registers), NULL);
3903 register_gdbarch_swap (NULL, 0, build_infrun);
3905 add_info ("signals", signals_info,
3906 "What debugger does when program gets various signals.\n\
3907 Specify a signal as argument to print info on that signal only.");
3908 add_info_alias ("handle", "signals", 0);
3910 add_com ("handle", class_run, handle_command,
3911 concat ("Specify how to handle a signal.\n\
3912 Args are signals and actions to apply to those signals.\n\
3913 Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\
3914 from 1-15 are allowed for compatibility with old versions of GDB.\n\
3915 Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\
3916 The special arg \"all\" is recognized to mean all signals except those\n\
3917 used by the debugger, typically SIGTRAP and SIGINT.\n",
3918 "Recognized actions include \"stop\", \"nostop\", \"print\", \"noprint\",\n\
3919 \"pass\", \"nopass\", \"ignore\", or \"noignore\".\n\
3920 Stop means reenter debugger if this signal happens (implies print).\n\
3921 Print means print a message if this signal happens.\n\
3922 Pass means let program see this signal; otherwise program doesn't know.\n\
3923 Ignore is a synonym for nopass and noignore is a synonym for pass.\n\
3924 Pass and Stop may be combined.", NULL));
3927 add_com ("lz", class_info, signals_info,
3928 "What debugger does when program gets various signals.\n\
3929 Specify a signal as argument to print info on that signal only.");
3930 add_com ("z", class_run, xdb_handle_command,
3931 concat ("Specify how to handle a signal.\n\
3932 Args are signals and actions to apply to those signals.\n\
3933 Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\
3934 from 1-15 are allowed for compatibility with old versions of GDB.\n\
3935 Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\
3936 The special arg \"all\" is recognized to mean all signals except those\n\
3937 used by the debugger, typically SIGTRAP and SIGINT.\n",
3938 "Recognized actions include \"s\" (toggles between stop and nostop), \n\
3939 \"r\" (toggles between print and noprint), \"i\" (toggles between pass and \
3940 nopass), \"Q\" (noprint)\n\
3941 Stop means reenter debugger if this signal happens (implies print).\n\
3942 Print means print a message if this signal happens.\n\
3943 Pass means let program see this signal; otherwise program doesn't know.\n\
3944 Ignore is a synonym for nopass and noignore is a synonym for pass.\n\
3945 Pass and Stop may be combined.", NULL));
3949 stop_command = add_cmd ("stop", class_obscure, not_just_help_class_command,
3950 "There is no `stop' command, but you can set a hook on `stop'.\n\
3951 This allows you to set a list of commands to be run each time execution\n\
3952 of the program stops.", &cmdlist);
3954 numsigs = (int) TARGET_SIGNAL_LAST;
3955 signal_stop = (unsigned char *)
3956 xmalloc (sizeof (signal_stop[0]) * numsigs);
3957 signal_print = (unsigned char *)
3958 xmalloc (sizeof (signal_print[0]) * numsigs);
3959 signal_program = (unsigned char *)
3960 xmalloc (sizeof (signal_program[0]) * numsigs);
3961 for (i = 0; i < numsigs; i++)
3964 signal_print[i] = 1;
3965 signal_program[i] = 1;
3968 /* Signals caused by debugger's own actions
3969 should not be given to the program afterwards. */
3970 signal_program[TARGET_SIGNAL_TRAP] = 0;
3971 signal_program[TARGET_SIGNAL_INT] = 0;
3973 /* Signals that are not errors should not normally enter the debugger. */
3974 signal_stop[TARGET_SIGNAL_ALRM] = 0;
3975 signal_print[TARGET_SIGNAL_ALRM] = 0;
3976 signal_stop[TARGET_SIGNAL_VTALRM] = 0;
3977 signal_print[TARGET_SIGNAL_VTALRM] = 0;
3978 signal_stop[TARGET_SIGNAL_PROF] = 0;
3979 signal_print[TARGET_SIGNAL_PROF] = 0;
3980 signal_stop[TARGET_SIGNAL_CHLD] = 0;
3981 signal_print[TARGET_SIGNAL_CHLD] = 0;
3982 signal_stop[TARGET_SIGNAL_IO] = 0;
3983 signal_print[TARGET_SIGNAL_IO] = 0;
3984 signal_stop[TARGET_SIGNAL_POLL] = 0;
3985 signal_print[TARGET_SIGNAL_POLL] = 0;
3986 signal_stop[TARGET_SIGNAL_URG] = 0;
3987 signal_print[TARGET_SIGNAL_URG] = 0;
3988 signal_stop[TARGET_SIGNAL_WINCH] = 0;
3989 signal_print[TARGET_SIGNAL_WINCH] = 0;
3991 /* These signals are used internally by user-level thread
3992 implementations. (See signal(5) on Solaris.) Like the above
3993 signals, a healthy program receives and handles them as part of
3994 its normal operation. */
3995 signal_stop[TARGET_SIGNAL_LWP] = 0;
3996 signal_print[TARGET_SIGNAL_LWP] = 0;
3997 signal_stop[TARGET_SIGNAL_WAITING] = 0;
3998 signal_print[TARGET_SIGNAL_WAITING] = 0;
3999 signal_stop[TARGET_SIGNAL_CANCEL] = 0;
4000 signal_print[TARGET_SIGNAL_CANCEL] = 0;
4004 (add_set_cmd ("stop-on-solib-events", class_support, var_zinteger,
4005 (char *) &stop_on_solib_events,
4006 "Set stopping for shared library events.\n\
4007 If nonzero, gdb will give control to the user when the dynamic linker\n\
4008 notifies gdb of shared library events. The most common event of interest\n\
4009 to the user would be loading/unloading of a new library.\n",
4014 c = add_set_enum_cmd ("follow-fork-mode",
4016 follow_fork_mode_kind_names,
4017 (char *) &follow_fork_mode_string,
4018 /* ??rehrauer: The "both" option is broken, by what may be a 10.20
4019 kernel problem. It's also not terribly useful without a GUI to
4020 help the user drive two debuggers. So for now, I'm disabling
4021 the "both" option. */
4022 /* "Set debugger response to a program call of fork \
4024 A fork or vfork creates a new process. follow-fork-mode can be:\n\
4025 parent - the original process is debugged after a fork\n\
4026 child - the new process is debugged after a fork\n\
4027 both - both the parent and child are debugged after a fork\n\
4028 ask - the debugger will ask for one of the above choices\n\
4029 For \"both\", another copy of the debugger will be started to follow\n\
4030 the new child process. The original debugger will continue to follow\n\
4031 the original parent process. To distinguish their prompts, the\n\
4032 debugger copy's prompt will be changed.\n\
4033 For \"parent\" or \"child\", the unfollowed process will run free.\n\
4034 By default, the debugger will follow the parent process.",
4036 "Set debugger response to a program call of fork \
4038 A fork or vfork creates a new process. follow-fork-mode can be:\n\
4039 parent - the original process is debugged after a fork\n\
4040 child - the new process is debugged after a fork\n\
4041 ask - the debugger will ask for one of the above choices\n\
4042 For \"parent\" or \"child\", the unfollowed process will run free.\n\
4043 By default, the debugger will follow the parent process.",
4045 /* c->function.sfunc = ; */
4046 add_show_from_set (c, &showlist);
4048 set_follow_fork_mode_command ("parent", 0, NULL);
4050 c = add_set_enum_cmd ("scheduler-locking", class_run,
4051 scheduler_enums, /* array of string names */
4052 (char *) &scheduler_mode, /* current mode */
4053 "Set mode for locking scheduler during execution.\n\
4054 off == no locking (threads may preempt at any time)\n\
4055 on == full locking (no thread except the current thread may run)\n\
4056 step == scheduler locked during every single-step operation.\n\
4057 In this mode, no other thread may run during a step command.\n\
4058 Other threads may run while stepping over a function call ('next').",
4061 c->function.sfunc = set_schedlock_func; /* traps on target vector */
4062 add_show_from_set (c, &showlist);