import gdb-1999-08-02 snapshot
[deliverable/binutils-gdb.git] / gdb / infrun.c
1 /* Target-struct-independent code to start (run) and stop an inferior process.
2 Copyright 1986-1989, 1991-1999 Free Software Foundation, Inc.
3
4 This file is part of GDB.
5
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.
10
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.
15
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. */
20
21 #include "defs.h"
22 #include "gdb_string.h"
23 #include <ctype.h>
24 #include "symtab.h"
25 #include "frame.h"
26 #include "inferior.h"
27 #include "breakpoint.h"
28 #include "wait.h"
29 #include "gdbcore.h"
30 #include "gdbcmd.h"
31 #include "target.h"
32 #include "gdbthread.h"
33 #include "annotate.h"
34 #include "symfile.h" /* for overlay functions */
35 #include "top.h"
36 #include <signal.h>
37 #include "event-loop.h"
38
39 /* Prototypes for local functions */
40
41 static void signals_info PARAMS ((char *, int));
42
43 static void handle_command PARAMS ((char *, int));
44
45 static void sig_print_info PARAMS ((enum target_signal));
46
47 static void sig_print_header PARAMS ((void));
48
49 static void resume_cleanups PARAMS ((int));
50
51 static int hook_stop_stub PARAMS ((PTR));
52
53 static void delete_breakpoint_current_contents PARAMS ((PTR));
54
55 static void set_follow_fork_mode_command PARAMS ((char *arg, int from_tty, struct cmd_list_element * c));
56
57 static void complete_execution PARAMS ((void));
58
59 int inferior_ignoring_startup_exec_events = 0;
60 int inferior_ignoring_leading_exec_events = 0;
61
62 /* In asynchronous mode, but simulating synchronous execution. */
63 int sync_execution = 0;
64
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
67 running in. */
68 static int switched_from_inferior_pid;
69
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. */
73
74 #ifndef MAY_SWITCH_FROM_INFERIOR_PID
75 #define MAY_SWITCH_FROM_INFERIOR_PID (0)
76 #endif
77
78 static int may_switch_from_inferior_pid = MAY_SWITCH_FROM_INFERIOR_PID;
79
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. */
82
83 #ifndef MAY_FOLLOW_EXEC
84 #define MAY_FOLLOW_EXEC (0)
85 #endif
86
87 static int may_follow_exec = MAY_FOLLOW_EXEC;
88
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
94 removed.
95
96 This is not thread-specific, so it isn't saved as part of
97 the infrun state.
98
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;
103
104 /* This is true if thread_step_needed should actually be used. At
105 present this is only true for HP-UX native. */
106
107 #ifndef USE_THREAD_STEP_NEEDED
108 #define USE_THREAD_STEP_NEEDED (0)
109 #endif
110
111 static int use_thread_step_needed = USE_THREAD_STEP_NEEDED;
112
113 static void follow_inferior_fork PARAMS ((int parent_pid,
114 int child_pid,
115 int has_forked,
116 int has_vforked));
117
118 static void follow_fork PARAMS ((int parent_pid, int child_pid));
119
120 static void follow_vfork PARAMS ((int parent_pid, int child_pid));
121
122 static void set_schedlock_func PARAMS ((char *args, int from_tty,
123 struct cmd_list_element * c));
124
125 static int is_internal_shlib_eventpoint PARAMS ((struct breakpoint * ep));
126
127 static int stopped_for_internal_shlib_event PARAMS ((bpstat bs));
128
129 static int stopped_for_shlib_catchpoint PARAMS ((bpstat bs,
130 struct breakpoint ** cp_p));
131
132 #if __STDC__
133 struct execution_control_state;
134 #endif
135 static int currently_stepping PARAMS ((struct execution_control_state * ecs));
136
137 static void xdb_handle_command PARAMS ((char *args, int from_tty));
138
139 void _initialize_infrun PARAMS ((void));
140
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. */
144
145 #ifndef GET_LONGJMP_TARGET
146 #define GET_LONGJMP_TARGET(PC_ADDR) 0
147 #endif
148
149
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. */
153
154 #ifndef SKIP_TRAMPOLINE_CODE
155 #define SKIP_TRAMPOLINE_CODE(pc) 0
156 #endif
157
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
167 breakpoint. */
168
169 #ifndef DYNAMIC_TRAMPOLINE_NEXTPC
170 #define DYNAMIC_TRAMPOLINE_NEXTPC(pc) 0
171 #endif
172
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. */
177
178 #ifndef IN_SOLIB_DYNSYM_RESOLVE_CODE
179 #define IN_SOLIB_DYNSYM_RESOLVE_CODE(pc) 0
180 #endif
181
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. */
185
186 #ifndef IN_SOLIB_CALL_TRAMPOLINE
187 #define IN_SOLIB_CALL_TRAMPOLINE(pc,name) 0
188 #endif
189
190 /* In some shared library schemes, the return path from a shared library
191 call may need to go through a trampoline too. */
192
193 #ifndef IN_SOLIB_RETURN_TRAMPOLINE
194 #define IN_SOLIB_RETURN_TRAMPOLINE(pc,name) 0
195 #endif
196
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
199 dld itself).
200
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. */
204
205 #ifndef SOLIB_IN_DYNAMIC_LINKER
206 #define SOLIB_IN_DYNAMIC_LINKER(pid,pc) 0
207 #endif
208
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
215 #endif
216
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
221 confusion. */
222
223 #ifndef INSTRUCTION_NULLIFIED
224 #define INSTRUCTION_NULLIFIED 0
225 #endif
226
227 /* Convert the #defines into values. This is temporary until wfi control
228 flow is completely sorted out. */
229
230 #ifndef HAVE_STEPPABLE_WATCHPOINT
231 #define HAVE_STEPPABLE_WATCHPOINT 0
232 #else
233 #undef HAVE_STEPPABLE_WATCHPOINT
234 #define HAVE_STEPPABLE_WATCHPOINT 1
235 #endif
236
237 #ifndef HAVE_NONSTEPPABLE_WATCHPOINT
238 #define HAVE_NONSTEPPABLE_WATCHPOINT 0
239 #else
240 #undef HAVE_NONSTEPPABLE_WATCHPOINT
241 #define HAVE_NONSTEPPABLE_WATCHPOINT 1
242 #endif
243
244 #ifndef HAVE_CONTINUABLE_WATCHPOINT
245 #define HAVE_CONTINUABLE_WATCHPOINT 0
246 #else
247 #undef HAVE_CONTINUABLE_WATCHPOINT
248 #define HAVE_CONTINUABLE_WATCHPOINT 1
249 #endif
250
251 /* Tables of how to react to signals; the user sets them. */
252
253 static unsigned char *signal_stop;
254 static unsigned char *signal_print;
255 static unsigned char *signal_program;
256
257 #define SET_SIGS(nsigs,sigs,flags) \
258 do { \
259 int signum = (nsigs); \
260 while (signum-- > 0) \
261 if ((sigs)[signum]) \
262 (flags)[signum] = 1; \
263 } while (0)
264
265 #define UNSET_SIGS(nsigs,sigs,flags) \
266 do { \
267 int signum = (nsigs); \
268 while (signum-- > 0) \
269 if ((sigs)[signum]) \
270 (flags)[signum] = 0; \
271 } while (0)
272
273
274 /* Command list pointer for the "stop" placeholder. */
275
276 static struct cmd_list_element *stop_command;
277
278 /* Nonzero if breakpoints are now inserted in the inferior. */
279
280 static int breakpoints_inserted;
281
282 /* Function inferior was in as of last step command. */
283
284 static struct symbol *step_start_function;
285
286 /* Nonzero if we are expecting a trace trap and should proceed from it. */
287
288 static int trap_expected;
289
290 #ifdef SOLIB_ADD
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;
294 #endif
295
296 #ifdef HP_OS_BUG
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. */
300
301 static int trap_expected_after_continue;
302 #endif
303
304 /* Nonzero means expecting a trace trap
305 and should stop the inferior and return silently when it happens. */
306
307 int stop_after_trap;
308
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?). */
313
314 int stop_soon_quietly;
315
316 /* Nonzero if proceed is being used for a "finish" command or a similar
317 situation when stop_registers should be saved. */
318
319 int proceed_to_finish;
320
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). */
325
326 char *stop_registers;
327
328 /* Nonzero if program stopped due to error trying to insert breakpoints. */
329
330 static int breakpoints_failed;
331
332 /* Nonzero after stop if current stack frame should be printed. */
333
334 static int stop_print_frame;
335
336 static struct breakpoint *step_resume_breakpoint = NULL;
337 static struct breakpoint *through_sigtramp_breakpoint = NULL;
338
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;
346
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
350 immediately. */
351 static struct
352 {
353 enum target_waitkind kind;
354 struct
355 {
356 int parent_pid;
357 int saw_parent_fork;
358 int child_pid;
359 int saw_child_fork;
360 int saw_child_exec;
361 }
362 fork_event;
363 char *execd_pathname;
364 }
365 pending_follow;
366
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.
370
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.
375
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;
381
382 static char *follow_fork_mode_kind_names[] =
383 {
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
387 the "both" option.
388 "parent", "child", "both", "ask" };
389 */
390 "parent", "child", "ask"};
391
392 static char *follow_fork_mode_string = NULL;
393 \f
394
395 static void
396 follow_inferior_fork (parent_pid, child_pid, has_forked, has_vforked)
397 int parent_pid;
398 int child_pid;
399 int has_forked;
400 int has_vforked;
401 {
402 int followed_parent = 0;
403 int followed_child = 0;
404 int ima_clone = 0;
405
406 /* Which process did the user want us to follow? */
407 char *follow_mode =
408 savestring (follow_fork_mode_string, strlen (follow_fork_mode_string));
409
410 /* Or, did the user not know, and want us to ask? */
411 if (STREQ (follow_fork_mode_string, "ask"))
412 {
413 char requested_mode[100];
414
415 free (follow_mode);
416 error ("\"ask\" mode NYI");
417 follow_mode = savestring (requested_mode, strlen (requested_mode));
418 }
419
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
422 for it. */
423 if (STREQ (follow_mode, "parent"))
424 {
425 followed_parent = 1;
426
427 /* We're already attached to the parent, by default. */
428
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)
433 {
434 detach_breakpoints (child_pid);
435 #ifdef SOLIB_REMOVE_INFERIOR_HOOK
436 SOLIB_REMOVE_INFERIOR_HOOK (child_pid);
437 #endif
438 }
439
440 /* Detach from the child. */
441 dont_repeat ();
442
443 target_require_detach (child_pid, "", 1);
444 }
445
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"))
449 {
450 char child_pid_spelling[100]; /* Arbitrary length. */
451
452 followed_child = 1;
453
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)
461 {
462 detach_breakpoints (child_pid);
463 }
464
465 /* Before detaching from the parent, remove all breakpoints from it. */
466 remove_breakpoints ();
467
468 /* Also reset the solib inferior hook from the parent. */
469 #ifdef SOLIB_REMOVE_INFERIOR_HOOK
470 SOLIB_REMOVE_INFERIOR_HOOK (inferior_pid);
471 #endif
472
473 /* Detach from the parent. */
474 dont_repeat ();
475 target_detach (NULL, 1);
476
477 /* Attach to the child. */
478 inferior_pid = child_pid;
479 sprintf (child_pid_spelling, "%d", child_pid);
480 dont_repeat ();
481
482 target_require_attach (child_pid_spelling, 1);
483
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
486 thread number.
487
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);
497
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)
502 {
503 breakpoint_re_set ();
504 insert_breakpoints ();
505 }
506 }
507
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"))
511 {
512 char pid_suffix[100]; /* Arbitrary length. */
513
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... */
516 dont_repeat ();
517 target_clone_and_follow_inferior (child_pid, &followed_child);
518 followed_parent = !followed_child;
519
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));
524 }
525
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
529 of the events.
530
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!)
547
548 Sequence of events, as reported to gdb from HPUX:
549
550 Parent Child Action for gdb to take
551 -------------------------------------------------------
552 1 VFORK Continue child
553 2 EXEC
554 3 EXEC or EXIT
555 4 VFORK */
556 if (has_vforked)
557 {
558 target_post_follow_vfork (parent_pid,
559 followed_parent,
560 child_pid,
561 followed_child);
562 }
563
564 pending_follow.fork_event.saw_parent_fork = 0;
565 pending_follow.fork_event.saw_child_fork = 0;
566
567 free (follow_mode);
568 }
569
570 static void
571 follow_fork (parent_pid, child_pid)
572 int parent_pid;
573 int child_pid;
574 {
575 follow_inferior_fork (parent_pid, child_pid, 1, 0);
576 }
577
578
579 /* Forward declaration. */
580 static void follow_exec PARAMS ((int, char *));
581
582 static void
583 follow_vfork (parent_pid, child_pid)
584 int parent_pid;
585 int child_pid;
586 {
587 follow_inferior_fork (parent_pid, child_pid, 0, 1);
588
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))
591 {
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);
596 }
597 }
598
599 static void
600 follow_exec (pid, execd_pathname)
601 int pid;
602 char *execd_pathname;
603 {
604 int saved_pid = pid;
605 struct target_ops *tgt;
606
607 if (!may_follow_exec)
608 return;
609
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))
614 {
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;
619
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)
623 return;
624 }
625
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
628 momentary bp's, etc.
629
630 If there are breakpoints, they aren't really inserted now,
631 since the exec() transformed our inferior into a fresh set
632 of instructions.
633
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.
637
638 However, any "raw" breakpoints must be removed from the list
639 (e.g., the solib bp's), since their address is probably invalid
640 now.
641
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 ();
647
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;
652 step_range_end = 0;
653
654 /* If there was one, it's gone now. */
655 through_sigtramp_breakpoint = NULL;
656
657 /* What is this a.out's name? */
658 printf_unfiltered ("Executing new program: %s\n", execd_pathname);
659
660 /* We've followed the inferior through an exec. Therefore, the
661 inferior has essentially been killed & reborn. */
662
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... */
666 if (tgt == NULL)
667 error ("Could find run target to save before following exec");
668
669 gdb_flush (gdb_stdout);
670 target_mourn_inferior ();
671 inferior_pid = saved_pid; /* Because mourn_inferior resets inferior_pid. */
672 push_target (tgt);
673
674 /* That a.out is now the one to use. */
675 exec_file_attach (execd_pathname, 0);
676
677 /* And also is where symbols can be found. */
678 symbol_file_command (execd_pathname, 0);
679
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)
684 SOLIB_RESTART ();
685 #endif
686 #ifdef SOLIB_CREATE_INFERIOR_HOOK
687 SOLIB_CREATE_INFERIOR_HOOK (inferior_pid);
688 #endif
689
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 ();
694
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.) */
699 }
700
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;
705 \f
706
707 /* Things to clean up if we QUIT out of resume (). */
708 /* ARGSUSED */
709 static void
710 resume_cleanups (arg)
711 int arg;
712 {
713 normal_stop ();
714 }
715
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};
722
723 static void
724 set_schedlock_func (args, from_tty, c)
725 char *args;
726 int from_tty;
727 struct cmd_list_element *c;
728 {
729 if (c->type == set_cmd)
730 if (!target_can_lock_scheduler)
731 {
732 scheduler_mode = schedlock_off;
733 error ("Target '%s' cannot support this command.",
734 target_shortname);
735 }
736 }
737
738
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).
744
745 STEP nonzero if we should step (zero to continue instead).
746 SIG is the signal to give the inferior (zero for none). */
747 void
748 resume (step, sig)
749 int step;
750 enum target_signal sig;
751 {
752 int should_resume = 1;
753 struct cleanup *old_cleanups = make_cleanup ((make_cleanup_func)
754 resume_cleanups, 0);
755 QUIT;
756
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
760 it anyway. */
761 if (step && breakpoints_inserted && breakpoint_here_p (read_pc ()))
762 step = 0;
763 #endif
764
765 if (SOFTWARE_SINGLE_STEP_P && step)
766 {
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. */
770 step = 0;
771 /* and do not pull these breakpoints until after a `wait' in
772 `wait_for_inferior' */
773 singlestep_breakpoints_inserted_p = 1;
774 }
775
776 /* Handle any optimized stores to the inferior NOW... */
777 #ifdef DO_DEFERRED_STORES
778 DO_DEFERRED_STORES;
779 #endif
780
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)
784 {
785 case (TARGET_WAITKIND_FORKED):
786 pending_follow.kind = TARGET_WAITKIND_SPURIOUS;
787 follow_fork (inferior_pid, pending_follow.fork_event.child_pid);
788 break;
789
790 case (TARGET_WAITKIND_VFORKED):
791 {
792 int saw_child_exec = pending_follow.fork_event.saw_child_exec;
793
794 pending_follow.kind = TARGET_WAITKIND_SPURIOUS;
795 follow_vfork (inferior_pid, pending_follow.fork_event.child_pid);
796
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))
803 should_resume = 0;
804 }
805 break;
806
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. */
812 break;
813
814 default:
815 break;
816 }
817
818 /* Install inferior's terminal modes. */
819 target_terminal_inferior ();
820
821 if (should_resume)
822 {
823 if (use_thread_step_needed && thread_step_needed)
824 {
825 /* We stopped on a BPT instruction;
826 don't continue other threads and
827 just step this thread. */
828 thread_step_needed = 0;
829
830 if (!breakpoint_here_p (read_pc ()))
831 {
832 /* Breakpoint deleted: ok to do regular resume
833 where all the threads either step or continue. */
834 target_resume (-1, step, sig);
835 }
836 else
837 {
838 if (!step)
839 {
840 warning ("Internal error, changing continue to step.");
841 remove_breakpoints ();
842 breakpoints_inserted = 0;
843 trap_expected = 1;
844 step = 1;
845 }
846
847 target_resume (inferior_pid, step, sig);
848 }
849 }
850 else
851 {
852 /* Vanilla resume. */
853
854 if ((scheduler_mode == schedlock_on) ||
855 (scheduler_mode == schedlock_step && step != 0))
856 target_resume (inferior_pid, step, sig);
857 else
858 target_resume (-1, step, sig);
859 }
860 }
861
862 discard_cleanups (old_cleanups);
863 }
864 \f
865
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'. */
868
869 void
870 clear_proceed_status ()
871 {
872 trap_expected = 0;
873 step_range_start = 0;
874 step_range_end = 0;
875 step_frame_address = 0;
876 step_over_calls = -1;
877 stop_after_trap = 0;
878 stop_soon_quietly = 0;
879 proceed_to_finish = 0;
880 breakpoint_proceeded = 1; /* We're about to proceed... */
881
882 /* Discard any remaining commands or status from previous stop. */
883 bpstat_clear (&stop_bpstat);
884 }
885
886 /* Basic routine for continuing the program in various fashions.
887
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.
895
896 You should call clear_proceed_status before calling proceed. */
897
898 void
899 proceed (addr, siggnal, step)
900 CORE_ADDR addr;
901 enum target_signal siggnal;
902 int step;
903 {
904 int oneproc = 0;
905
906 if (step > 0)
907 step_start_function = find_pc_function (read_pc ());
908 if (step < 0)
909 stop_after_trap = 1;
910
911 if (addr == (CORE_ADDR) - 1)
912 {
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). */
917
918 if (read_pc () == stop_pc && breakpoint_here_p (read_pc ()))
919 oneproc = 1;
920
921 #ifndef STEP_SKIPS_DELAY
922 #define STEP_SKIPS_DELAY(pc) (0)
923 #define STEP_SKIPS_DELAY_P (0)
924 #endif
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 ()))
931 oneproc = 1;
932 }
933 else
934 {
935 write_pc (addr);
936
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.
940
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
944 they expect? */
945 thread_step_needed = 0;
946 }
947
948 #ifdef PREPARE_TO_PROCEED
949 /* In a multi-threaded task we may select another thread
950 and then continue or step.
951
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.
956
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 ()))
961 {
962 oneproc = 1;
963 thread_step_needed = 1;
964 }
965
966 #endif /* PREPARE_TO_PROCEED */
967
968 #ifdef HP_OS_BUG
969 if (trap_expected_after_continue)
970 {
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. */
975 oneproc = 1;
976 trap_expected_after_continue = 0;
977 }
978 #endif /* HP_OS_BUG */
979
980 if (oneproc)
981 /* We will get a trace trap after one instruction.
982 Continue it automatically and insert breakpoints then. */
983 trap_expected = 1;
984 else
985 {
986 int temp = insert_breakpoints ();
987 if (temp)
988 {
989 print_sys_errmsg ("ptrace", temp);
990 error ("Cannot insert breakpoints.\n\
991 The same program may be running in another process.");
992 }
993
994 breakpoints_inserted = 1;
995 }
996
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;
1003
1004 annotate_starting ();
1005
1006 /* Make sure that output from GDB appears before output from the
1007 inferior. */
1008 gdb_flush (gdb_stdout);
1009
1010 /* Resume inferior. */
1011 resume (oneproc || step || bpstat_should_step (), stop_signal);
1012
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)
1018 {
1019 wait_for_inferior ();
1020 normal_stop ();
1021 }
1022 }
1023
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
1027 is started. */
1028 static CORE_ADDR prev_pc;
1029 static CORE_ADDR prev_func_start;
1030 static char *prev_func_name;
1031 \f
1032
1033 /* Start remote-debugging of a machine over a serial link. */
1034 void
1035 start_remote ()
1036 {
1037 init_thread_list ();
1038 init_wait_for_inferior ();
1039 stop_soon_quietly = 1;
1040 trap_expected = 0;
1041
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)
1045 {
1046 wait_for_inferior ();
1047 normal_stop ();
1048 }
1049 else
1050 {
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. */
1054 sync_execution = 1;
1055 push_prompt ("", "", "");
1056 delete_file_handler (input_fd);
1057 target_executing = 1;
1058 }
1059 }
1060
1061 /* Initialize static vars when a new inferior begins. */
1062
1063 void
1064 init_wait_for_inferior ()
1065 {
1066 /* These are meaningless until the first time through wait_for_inferior. */
1067 prev_pc = 0;
1068 prev_func_start = 0;
1069 prev_func_name = NULL;
1070
1071 #ifdef HP_OS_BUG
1072 trap_expected_after_continue = 0;
1073 #endif
1074 breakpoints_inserted = 0;
1075 breakpoint_init_inferior (inf_starting);
1076
1077 /* Don't confuse first call to proceed(). */
1078 stop_signal = TARGET_SIGNAL_0;
1079
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;
1085
1086 /* See wait_for_inferior's handling of SYSCALL_ENTRY/RETURN events. */
1087 number_of_threads_in_syscalls = 0;
1088
1089 clear_proceed_status ();
1090 }
1091
1092 static void
1093 delete_breakpoint_current_contents (arg)
1094 PTR arg;
1095 {
1096 struct breakpoint **breakpointp = (struct breakpoint **) arg;
1097 if (*breakpointp != NULL)
1098 {
1099 delete_breakpoint (*breakpointp);
1100 *breakpointp = NULL;
1101 }
1102 }
1103 \f
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.) */
1107
1108 enum infwait_states
1109 {
1110 infwait_normal_state,
1111 infwait_thread_hop_state,
1112 infwait_nullified_state,
1113 infwait_nonstep_watch_state
1114 };
1115
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. */
1119
1120 struct execution_control_state
1121 {
1122 struct target_waitstatus ws;
1123 struct target_waitstatus *wp;
1124 int another_trap;
1125 int random_signal;
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;
1131 int current_line;
1132 struct symtab *current_symtab;
1133 int handling_longjmp; /* FIXME */
1134 int pid;
1135 int saved_inferior_pid;
1136 int update_step_sp;
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;
1144 int waiton_pid;
1145 int wait_some_more;
1146 };
1147
1148 void init_execution_control_state PARAMS ((struct execution_control_state * ecs));
1149
1150 void handle_inferior_event PARAMS ((struct execution_control_state * ecs));
1151
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. */
1157
1158 void
1159 wait_for_inferior ()
1160 {
1161 struct cleanup *old_cleanups;
1162 struct execution_control_state ecss;
1163 struct execution_control_state *ecs;
1164
1165 old_cleanups = make_cleanup (delete_breakpoint_current_contents,
1166 &step_resume_breakpoint);
1167 make_cleanup (delete_breakpoint_current_contents,
1168 &through_sigtramp_breakpoint);
1169
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. */
1172 ecs = &ecss;
1173
1174 /* Fill in with reasonable starting values. */
1175 init_execution_control_state (ecs);
1176
1177 thread_step_needed = 0;
1178
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;
1182
1183 overlay_cache_invalid = 1;
1184
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. */
1190
1191 registers_changed ();
1192
1193 while (1)
1194 {
1195 if (target_wait_hook)
1196 ecs->pid = target_wait_hook (ecs->waiton_pid, ecs->wp);
1197 else
1198 ecs->pid = target_wait (ecs->waiton_pid, ecs->wp);
1199
1200 /* Now figure out what to do with the result of the result. */
1201 handle_inferior_event (ecs);
1202
1203 if (!ecs->wait_some_more)
1204 break;
1205 }
1206 do_cleanups (old_cleanups);
1207 }
1208
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. */
1217
1218 struct execution_control_state async_ecss;
1219 struct execution_control_state *async_ecs;
1220
1221 void
1222 fetch_inferior_event ()
1223 {
1224 static struct cleanup *old_cleanups;
1225
1226 async_ecs = &async_ecss;
1227
1228 if (!async_ecs->wait_some_more)
1229 {
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);
1234
1235 /* Fill in with reasonable starting values. */
1236 init_execution_control_state (async_ecs);
1237
1238 thread_step_needed = 0;
1239
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;
1243
1244 overlay_cache_invalid = 1;
1245
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. */
1251
1252 registers_changed ();
1253 }
1254
1255 if (target_wait_hook)
1256 async_ecs->pid = target_wait_hook (async_ecs->waiton_pid, async_ecs->wp);
1257 else
1258 async_ecs->pid = target_wait (async_ecs->waiton_pid, async_ecs->wp);
1259
1260 /* Now figure out what to do with the result of the result. */
1261 handle_inferior_event (async_ecs);
1262
1263 if (!async_ecs->wait_some_more)
1264 {
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);
1269 normal_stop ();
1270 /* Is there anything left to do for the command issued to
1271 complete? */
1272 do_all_continuations ();
1273 /* Reset things after target has stopped for the async commands. */
1274 complete_execution ();
1275 }
1276 }
1277
1278 /* Prepare an execution control state for looping through a
1279 wait_for_inferior-type loop. */
1280
1281 void
1282 init_execution_control_state (ecs)
1283 struct execution_control_state *ecs;
1284 {
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);
1299 }
1300
1301 /* Call this function before setting step_resume_breakpoint, as a
1302 sanity check. We should never be setting a new
1303 step_resume_breakpoint when we have an old one active. */
1304 static void
1305 check_for_old_step_resume_breakpoint ()
1306 {
1307 if (step_resume_breakpoint)
1308 warning ("GDB bug: infrun.c (wait_for_inferior): dropping old step_resume breakpoint");
1309 }
1310
1311 /* Given an execution control state that has been freshly filled in
1312 by an event from the inferior, figure out what it means and take
1313 appropriate action. */
1314
1315 void
1316 handle_inferior_event (ecs)
1317 struct execution_control_state *ecs;
1318 {
1319 CORE_ADDR tmp;
1320 int stepped_after_stopped_by_watchpoint;
1321
1322 /* Keep this extra brace for now, minimizes diffs. */
1323 {
1324 switch (ecs->infwait_state)
1325 {
1326 case infwait_normal_state:
1327 /* Since we've done a wait, we have a new event. Don't
1328 carry over any expectations about needing to step over a
1329 breakpoint. */
1330 thread_step_needed = 0;
1331
1332 /* See comments where a TARGET_WAITKIND_SYSCALL_RETURN event
1333 is serviced in this loop, below. */
1334 if (ecs->enable_hw_watchpoints_after_wait)
1335 {
1336 TARGET_ENABLE_HW_WATCHPOINTS (inferior_pid);
1337 ecs->enable_hw_watchpoints_after_wait = 0;
1338 }
1339 stepped_after_stopped_by_watchpoint = 0;
1340 break;
1341
1342 case infwait_thread_hop_state:
1343 insert_breakpoints ();
1344
1345 /* We need to restart all the threads now,
1346 * unles we're running in scheduler-locked mode.
1347 * FIXME: shouldn't we look at currently_stepping ()?
1348 */
1349 if (scheduler_mode == schedlock_on)
1350 target_resume (ecs->pid, 0, TARGET_SIGNAL_0);
1351 else
1352 target_resume (-1, 0, TARGET_SIGNAL_0);
1353 ecs->infwait_state = infwait_normal_state;
1354 goto wfi_continue;
1355
1356 case infwait_nullified_state:
1357 break;
1358
1359 case infwait_nonstep_watch_state:
1360 insert_breakpoints ();
1361
1362 /* FIXME-maybe: is this cleaner than setting a flag? Does it
1363 handle things like signals arriving and other things happening
1364 in combination correctly? */
1365 stepped_after_stopped_by_watchpoint = 1;
1366 break;
1367 }
1368 ecs->infwait_state = infwait_normal_state;
1369
1370 flush_cached_frames ();
1371
1372 /* If it's a new process, add it to the thread database */
1373
1374 ecs->new_thread_event = ((ecs->pid != inferior_pid) && !in_thread_list (ecs->pid));
1375
1376 if (ecs->ws.kind != TARGET_WAITKIND_EXITED
1377 && ecs->ws.kind != TARGET_WAITKIND_SIGNALLED
1378 && ecs->new_thread_event)
1379 {
1380 add_thread (ecs->pid);
1381
1382 printf_filtered ("[New %s]\n", target_pid_or_tid_to_str (ecs->pid));
1383
1384 #if 0
1385 /* NOTE: This block is ONLY meant to be invoked in case of a
1386 "thread creation event"! If it is invoked for any other
1387 sort of event (such as a new thread landing on a breakpoint),
1388 the event will be discarded, which is almost certainly
1389 a bad thing!
1390
1391 To avoid this, the low-level module (eg. target_wait)
1392 should call in_thread_list and add_thread, so that the
1393 new thread is known by the time we get here. */
1394
1395 /* We may want to consider not doing a resume here in order
1396 to give the user a chance to play with the new thread.
1397 It might be good to make that a user-settable option. */
1398
1399 /* At this point, all threads are stopped (happens
1400 automatically in either the OS or the native code).
1401 Therefore we need to continue all threads in order to
1402 make progress. */
1403
1404 target_resume (-1, 0, TARGET_SIGNAL_0);
1405 goto wfi_continue;
1406 #endif
1407 }
1408
1409 switch (ecs->ws.kind)
1410 {
1411 case TARGET_WAITKIND_LOADED:
1412 /* Ignore gracefully during startup of the inferior, as it
1413 might be the shell which has just loaded some objects,
1414 otherwise add the symbols for the newly loaded objects. */
1415 #ifdef SOLIB_ADD
1416 if (!stop_soon_quietly)
1417 {
1418 /* Remove breakpoints, SOLIB_ADD might adjust
1419 breakpoint addresses via breakpoint_re_set. */
1420 if (breakpoints_inserted)
1421 remove_breakpoints ();
1422
1423 /* Check for any newly added shared libraries if we're
1424 supposed to be adding them automatically. */
1425 if (auto_solib_add)
1426 {
1427 /* Switch terminal for any messages produced by
1428 breakpoint_re_set. */
1429 target_terminal_ours_for_output ();
1430 SOLIB_ADD (NULL, 0, NULL);
1431 target_terminal_inferior ();
1432 }
1433
1434 /* Reinsert breakpoints and continue. */
1435 if (breakpoints_inserted)
1436 insert_breakpoints ();
1437 }
1438 #endif
1439 resume (0, TARGET_SIGNAL_0);
1440 goto wfi_continue;
1441
1442 case TARGET_WAITKIND_SPURIOUS:
1443 resume (0, TARGET_SIGNAL_0);
1444 goto wfi_continue;
1445
1446 case TARGET_WAITKIND_EXITED:
1447 target_terminal_ours (); /* Must do this before mourn anyway */
1448 annotate_exited (ecs->ws.value.integer);
1449 if (ecs->ws.value.integer)
1450 printf_filtered ("\nProgram exited with code 0%o.\n",
1451 (unsigned int) ecs->ws.value.integer);
1452 else
1453 printf_filtered ("\nProgram exited normally.\n");
1454
1455 /* Record the exit code in the convenience variable $_exitcode, so
1456 that the user can inspect this again later. */
1457 set_internalvar (lookup_internalvar ("_exitcode"),
1458 value_from_longest (builtin_type_int,
1459 (LONGEST) ecs->ws.value.integer));
1460 gdb_flush (gdb_stdout);
1461 target_mourn_inferior ();
1462 singlestep_breakpoints_inserted_p = 0; /*SOFTWARE_SINGLE_STEP_P */
1463 stop_print_frame = 0;
1464 goto stop_stepping;
1465
1466 case TARGET_WAITKIND_SIGNALLED:
1467 stop_print_frame = 0;
1468 stop_signal = ecs->ws.value.sig;
1469 target_terminal_ours (); /* Must do this before mourn anyway */
1470 annotate_signalled ();
1471
1472 /* This looks pretty bogus to me. Doesn't TARGET_WAITKIND_SIGNALLED
1473 mean it is already dead? This has been here since GDB 2.8, so
1474 perhaps it means rms didn't understand unix waitstatuses?
1475 For the moment I'm just kludging around this in remote.c
1476 rather than trying to change it here --kingdon, 5 Dec 1994. */
1477 target_kill (); /* kill mourns as well */
1478
1479 printf_filtered ("\nProgram terminated with signal ");
1480 annotate_signal_name ();
1481 printf_filtered ("%s", target_signal_to_name (stop_signal));
1482 annotate_signal_name_end ();
1483 printf_filtered (", ");
1484 annotate_signal_string ();
1485 printf_filtered ("%s", target_signal_to_string (stop_signal));
1486 annotate_signal_string_end ();
1487 printf_filtered (".\n");
1488
1489 printf_filtered ("The program no longer exists.\n");
1490 gdb_flush (gdb_stdout);
1491 singlestep_breakpoints_inserted_p = 0; /*SOFTWARE_SINGLE_STEP_P */
1492 goto stop_stepping;
1493
1494 /* The following are the only cases in which we keep going;
1495 the above cases end in a continue or goto. */
1496 case TARGET_WAITKIND_FORKED:
1497 stop_signal = TARGET_SIGNAL_TRAP;
1498 pending_follow.kind = ecs->ws.kind;
1499
1500 /* Ignore fork events reported for the parent; we're only
1501 interested in reacting to forks of the child. Note that
1502 we expect the child's fork event to be available if we
1503 waited for it now. */
1504 if (inferior_pid == ecs->pid)
1505 {
1506 pending_follow.fork_event.saw_parent_fork = 1;
1507 pending_follow.fork_event.parent_pid = ecs->pid;
1508 pending_follow.fork_event.child_pid = ecs->ws.value.related_pid;
1509 goto wfi_continue;
1510 }
1511 else
1512 {
1513 pending_follow.fork_event.saw_child_fork = 1;
1514 pending_follow.fork_event.child_pid = ecs->pid;
1515 pending_follow.fork_event.parent_pid = ecs->ws.value.related_pid;
1516 }
1517
1518 stop_pc = read_pc_pid (ecs->pid);
1519 ecs->saved_inferior_pid = inferior_pid;
1520 inferior_pid = ecs->pid;
1521 stop_bpstat = bpstat_stop_status
1522 (&stop_pc,
1523 (DECR_PC_AFTER_BREAK ?
1524 (prev_pc != stop_pc - DECR_PC_AFTER_BREAK
1525 && currently_stepping (ecs))
1526 : 0)
1527 );
1528 ecs->random_signal = !bpstat_explains_signal (stop_bpstat);
1529 inferior_pid = ecs->saved_inferior_pid;
1530 goto process_event_stop_test;
1531
1532 /* If this a platform which doesn't allow a debugger to touch a
1533 vfork'd inferior until after it exec's, then we'd best keep
1534 our fingers entirely off the inferior, other than continuing
1535 it. This has the unfortunate side-effect that catchpoints
1536 of vforks will be ignored. But since the platform doesn't
1537 allow the inferior be touched at vfork time, there's really
1538 little choice. */
1539 case TARGET_WAITKIND_VFORKED:
1540 stop_signal = TARGET_SIGNAL_TRAP;
1541 pending_follow.kind = ecs->ws.kind;
1542
1543 /* Is this a vfork of the parent? If so, then give any
1544 vfork catchpoints a chance to trigger now. (It's
1545 dangerous to do so if the child canot be touched until
1546 it execs, and the child has not yet exec'd. We probably
1547 should warn the user to that effect when the catchpoint
1548 triggers...) */
1549 if (ecs->pid == inferior_pid)
1550 {
1551 pending_follow.fork_event.saw_parent_fork = 1;
1552 pending_follow.fork_event.parent_pid = ecs->pid;
1553 pending_follow.fork_event.child_pid = ecs->ws.value.related_pid;
1554 }
1555
1556 /* If we've seen the child's vfork event but cannot really touch
1557 the child until it execs, then we must continue the child now.
1558 Else, give any vfork catchpoints a chance to trigger now. */
1559 else
1560 {
1561 pending_follow.fork_event.saw_child_fork = 1;
1562 pending_follow.fork_event.child_pid = ecs->pid;
1563 pending_follow.fork_event.parent_pid = ecs->ws.value.related_pid;
1564 target_post_startup_inferior (pending_follow.fork_event.child_pid);
1565 follow_vfork_when_exec = !target_can_follow_vfork_prior_to_exec ();
1566 if (follow_vfork_when_exec)
1567 {
1568 target_resume (ecs->pid, 0, TARGET_SIGNAL_0);
1569 goto wfi_continue;
1570 }
1571 }
1572
1573 stop_pc = read_pc ();
1574 stop_bpstat = bpstat_stop_status
1575 (&stop_pc,
1576 (DECR_PC_AFTER_BREAK ?
1577 (prev_pc != stop_pc - DECR_PC_AFTER_BREAK
1578 && currently_stepping (ecs))
1579 : 0)
1580 );
1581 ecs->random_signal = !bpstat_explains_signal (stop_bpstat);
1582 goto process_event_stop_test;
1583
1584 case TARGET_WAITKIND_EXECD:
1585 stop_signal = TARGET_SIGNAL_TRAP;
1586
1587 /* Is this a target which reports multiple exec events per actual
1588 call to exec()? (HP-UX using ptrace does, for example.) If so,
1589 ignore all but the last one. Just resume the exec'r, and wait
1590 for the next exec event. */
1591 if (inferior_ignoring_leading_exec_events)
1592 {
1593 inferior_ignoring_leading_exec_events--;
1594 if (pending_follow.kind == TARGET_WAITKIND_VFORKED)
1595 ENSURE_VFORKING_PARENT_REMAINS_STOPPED (pending_follow.fork_event.parent_pid);
1596 target_resume (ecs->pid, 0, TARGET_SIGNAL_0);
1597 goto wfi_continue;
1598 }
1599 inferior_ignoring_leading_exec_events =
1600 target_reported_exec_events_per_exec_call () - 1;
1601
1602 pending_follow.execd_pathname = savestring (ecs->ws.value.execd_pathname,
1603 strlen (ecs->ws.value.execd_pathname));
1604
1605 /* Did inferior_pid exec, or did a (possibly not-yet-followed)
1606 child of a vfork exec?
1607
1608 ??rehrauer: This is unabashedly an HP-UX specific thing. On
1609 HP-UX, events associated with a vforking inferior come in
1610 threes: a vfork event for the child (always first), followed
1611 a vfork event for the parent and an exec event for the child.
1612 The latter two can come in either order.
1613
1614 If we get the parent vfork event first, life's good: We follow
1615 either the parent or child, and then the child's exec event is
1616 a "don't care".
1617
1618 But if we get the child's exec event first, then we delay
1619 responding to it until we handle the parent's vfork. Because,
1620 otherwise we can't satisfy a "catch vfork". */
1621 if (pending_follow.kind == TARGET_WAITKIND_VFORKED)
1622 {
1623 pending_follow.fork_event.saw_child_exec = 1;
1624
1625 /* On some targets, the child must be resumed before
1626 the parent vfork event is delivered. A single-step
1627 suffices. */
1628 if (RESUME_EXECD_VFORKING_CHILD_TO_GET_PARENT_VFORK ())
1629 target_resume (ecs->pid, 1, TARGET_SIGNAL_0);
1630 /* We expect the parent vfork event to be available now. */
1631 goto wfi_continue;
1632 }
1633
1634 /* This causes the eventpoints and symbol table to be reset. Must
1635 do this now, before trying to determine whether to stop. */
1636 follow_exec (inferior_pid, pending_follow.execd_pathname);
1637 free (pending_follow.execd_pathname);
1638
1639 stop_pc = read_pc_pid (ecs->pid);
1640 ecs->saved_inferior_pid = inferior_pid;
1641 inferior_pid = ecs->pid;
1642 stop_bpstat = bpstat_stop_status
1643 (&stop_pc,
1644 (DECR_PC_AFTER_BREAK ?
1645 (prev_pc != stop_pc - DECR_PC_AFTER_BREAK
1646 && currently_stepping (ecs))
1647 : 0)
1648 );
1649 ecs->random_signal = !bpstat_explains_signal (stop_bpstat);
1650 inferior_pid = ecs->saved_inferior_pid;
1651 goto process_event_stop_test;
1652
1653 /* These syscall events are returned on HP-UX, as part of its
1654 implementation of page-protection-based "hardware" watchpoints.
1655 HP-UX has unfortunate interactions between page-protections and
1656 some system calls. Our solution is to disable hardware watches
1657 when a system call is entered, and reenable them when the syscall
1658 completes. The downside of this is that we may miss the precise
1659 point at which a watched piece of memory is modified. "Oh well."
1660
1661 Note that we may have multiple threads running, which may each
1662 enter syscalls at roughly the same time. Since we don't have a
1663 good notion currently of whether a watched piece of memory is
1664 thread-private, we'd best not have any page-protections active
1665 when any thread is in a syscall. Thus, we only want to reenable
1666 hardware watches when no threads are in a syscall.
1667
1668 Also, be careful not to try to gather much state about a thread
1669 that's in a syscall. It's frequently a losing proposition. */
1670 case TARGET_WAITKIND_SYSCALL_ENTRY:
1671 number_of_threads_in_syscalls++;
1672 if (number_of_threads_in_syscalls == 1)
1673 {
1674 TARGET_DISABLE_HW_WATCHPOINTS (inferior_pid);
1675 }
1676 resume (0, TARGET_SIGNAL_0);
1677 goto wfi_continue;
1678
1679 /* Before examining the threads further, step this thread to
1680 get it entirely out of the syscall. (We get notice of the
1681 event when the thread is just on the verge of exiting a
1682 syscall. Stepping one instruction seems to get it back
1683 into user code.)
1684
1685 Note that although the logical place to reenable h/w watches
1686 is here, we cannot. We cannot reenable them before stepping
1687 the thread (this causes the next wait on the thread to hang).
1688
1689 Nor can we enable them after stepping until we've done a wait.
1690 Thus, we simply set the flag ecs->enable_hw_watchpoints_after_wait
1691 here, which will be serviced immediately after the target
1692 is waited on. */
1693 case TARGET_WAITKIND_SYSCALL_RETURN:
1694 target_resume (ecs->pid, 1, TARGET_SIGNAL_0);
1695
1696 if (number_of_threads_in_syscalls > 0)
1697 {
1698 number_of_threads_in_syscalls--;
1699 ecs->enable_hw_watchpoints_after_wait =
1700 (number_of_threads_in_syscalls == 0);
1701 }
1702 goto wfi_continue;
1703
1704 case TARGET_WAITKIND_STOPPED:
1705 stop_signal = ecs->ws.value.sig;
1706 break;
1707 }
1708
1709 /* We may want to consider not doing a resume here in order to give
1710 the user a chance to play with the new thread. It might be good
1711 to make that a user-settable option. */
1712
1713 /* At this point, all threads are stopped (happens automatically in
1714 either the OS or the native code). Therefore we need to continue
1715 all threads in order to make progress. */
1716 if (ecs->new_thread_event)
1717 {
1718 target_resume (-1, 0, TARGET_SIGNAL_0);
1719 goto wfi_continue;
1720 }
1721
1722 stop_pc = read_pc_pid (ecs->pid);
1723
1724 /* See if a thread hit a thread-specific breakpoint that was meant for
1725 another thread. If so, then step that thread past the breakpoint,
1726 and continue it. */
1727
1728 if (stop_signal == TARGET_SIGNAL_TRAP)
1729 {
1730 if (SOFTWARE_SINGLE_STEP_P && singlestep_breakpoints_inserted_p)
1731 ecs->random_signal = 0;
1732 else if (breakpoints_inserted
1733 && breakpoint_here_p (stop_pc - DECR_PC_AFTER_BREAK))
1734 {
1735 ecs->random_signal = 0;
1736 if (!breakpoint_thread_match (stop_pc - DECR_PC_AFTER_BREAK,
1737 ecs->pid))
1738 {
1739 int remove_status;
1740
1741 /* Saw a breakpoint, but it was hit by the wrong thread.
1742 Just continue. */
1743 write_pc_pid (stop_pc - DECR_PC_AFTER_BREAK, ecs->pid);
1744
1745 remove_status = remove_breakpoints ();
1746 /* Did we fail to remove breakpoints? If so, try
1747 to set the PC past the bp. (There's at least
1748 one situation in which we can fail to remove
1749 the bp's: On HP-UX's that use ttrace, we can't
1750 change the address space of a vforking child
1751 process until the child exits (well, okay, not
1752 then either :-) or execs. */
1753 if (remove_status != 0)
1754 {
1755 write_pc_pid (stop_pc - DECR_PC_AFTER_BREAK + 4, ecs->pid);
1756 }
1757 else
1758 { /* Single step */
1759 target_resume (ecs->pid, 1, TARGET_SIGNAL_0);
1760 /* FIXME: What if a signal arrives instead of the
1761 single-step happening? */
1762
1763 ecs->waiton_pid = ecs->pid;
1764 ecs->wp = &(ecs->ws);
1765 ecs->infwait_state = infwait_thread_hop_state;
1766 goto wfi_continue;
1767 }
1768
1769 /* We need to restart all the threads now,
1770 * unles we're running in scheduler-locked mode.
1771 * FIXME: shouldn't we look at currently_stepping ()?
1772 */
1773 if (scheduler_mode == schedlock_on)
1774 target_resume (ecs->pid, 0, TARGET_SIGNAL_0);
1775 else
1776 target_resume (-1, 0, TARGET_SIGNAL_0);
1777 goto wfi_continue;
1778 }
1779 else
1780 {
1781 /* This breakpoint matches--either it is the right
1782 thread or it's a generic breakpoint for all threads.
1783 Remember that we'll need to step just _this_ thread
1784 on any following user continuation! */
1785 thread_step_needed = 1;
1786 }
1787 }
1788 }
1789 else
1790 ecs->random_signal = 1;
1791
1792 /* See if something interesting happened to the non-current thread. If
1793 so, then switch to that thread, and eventually give control back to
1794 the user.
1795
1796 Note that if there's any kind of pending follow (i.e., of a fork,
1797 vfork or exec), we don't want to do this now. Rather, we'll let
1798 the next resume handle it. */
1799 if ((ecs->pid != inferior_pid) &&
1800 (pending_follow.kind == TARGET_WAITKIND_SPURIOUS))
1801 {
1802 int printed = 0;
1803
1804 /* If it's a random signal for a non-current thread, notify user
1805 if he's expressed an interest. */
1806 if (ecs->random_signal
1807 && signal_print[stop_signal])
1808 {
1809 /* ??rehrauer: I don't understand the rationale for this code. If the
1810 inferior will stop as a result of this signal, then the act of handling
1811 the stop ought to print a message that's couches the stoppage in user
1812 terms, e.g., "Stopped for breakpoint/watchpoint". If the inferior
1813 won't stop as a result of the signal -- i.e., if the signal is merely
1814 a side-effect of something GDB's doing "under the covers" for the
1815 user, such as stepping threads over a breakpoint they shouldn't stop
1816 for -- then the message seems to be a serious annoyance at best.
1817
1818 For now, remove the message altogether. */
1819 #if 0
1820 printed = 1;
1821 target_terminal_ours_for_output ();
1822 printf_filtered ("\nProgram received signal %s, %s.\n",
1823 target_signal_to_name (stop_signal),
1824 target_signal_to_string (stop_signal));
1825 gdb_flush (gdb_stdout);
1826 #endif
1827 }
1828
1829 /* If it's not SIGTRAP and not a signal we want to stop for, then
1830 continue the thread. */
1831
1832 if (stop_signal != TARGET_SIGNAL_TRAP
1833 && !signal_stop[stop_signal])
1834 {
1835 if (printed)
1836 target_terminal_inferior ();
1837
1838 /* Clear the signal if it should not be passed. */
1839 if (signal_program[stop_signal] == 0)
1840 stop_signal = TARGET_SIGNAL_0;
1841
1842 target_resume (ecs->pid, 0, stop_signal);
1843 goto wfi_continue;
1844 }
1845
1846 /* It's a SIGTRAP or a signal we're interested in. Switch threads,
1847 and fall into the rest of wait_for_inferior(). */
1848
1849 /* Save infrun state for the old thread. */
1850 save_infrun_state (inferior_pid, prev_pc,
1851 prev_func_start, prev_func_name,
1852 trap_expected, step_resume_breakpoint,
1853 through_sigtramp_breakpoint,
1854 step_range_start, step_range_end,
1855 step_frame_address, ecs->handling_longjmp,
1856 ecs->another_trap,
1857 ecs->stepping_through_solib_after_catch,
1858 ecs->stepping_through_solib_catchpoints,
1859 ecs->stepping_through_sigtramp);
1860
1861 if (may_switch_from_inferior_pid)
1862 switched_from_inferior_pid = inferior_pid;
1863
1864 inferior_pid = ecs->pid;
1865
1866 /* Load infrun state for the new thread. */
1867 load_infrun_state (inferior_pid, &prev_pc,
1868 &prev_func_start, &prev_func_name,
1869 &trap_expected, &step_resume_breakpoint,
1870 &through_sigtramp_breakpoint,
1871 &step_range_start, &step_range_end,
1872 &step_frame_address, &ecs->handling_longjmp,
1873 &ecs->another_trap,
1874 &ecs->stepping_through_solib_after_catch,
1875 &ecs->stepping_through_solib_catchpoints,
1876 &ecs->stepping_through_sigtramp);
1877
1878 if (context_hook)
1879 context_hook (pid_to_thread_id (ecs->pid));
1880
1881 printf_filtered ("[Switching to %s]\n", target_pid_to_str (ecs->pid));
1882 flush_cached_frames ();
1883 }
1884
1885 if (SOFTWARE_SINGLE_STEP_P && singlestep_breakpoints_inserted_p)
1886 {
1887 /* Pull the single step breakpoints out of the target. */
1888 SOFTWARE_SINGLE_STEP (0, 0);
1889 singlestep_breakpoints_inserted_p = 0;
1890 }
1891
1892 /* If PC is pointing at a nullified instruction, then step beyond
1893 it so that the user won't be confused when GDB appears to be ready
1894 to execute it. */
1895
1896 /* if (INSTRUCTION_NULLIFIED && currently_stepping (ecs)) */
1897 if (INSTRUCTION_NULLIFIED)
1898 {
1899 registers_changed ();
1900 target_resume (ecs->pid, 1, TARGET_SIGNAL_0);
1901
1902 /* We may have received a signal that we want to pass to
1903 the inferior; therefore, we must not clobber the waitstatus
1904 in WS. */
1905
1906 ecs->infwait_state = infwait_nullified_state;
1907 ecs->waiton_pid = ecs->pid;
1908 ecs->wp = &(ecs->tmpstatus);
1909 goto wfi_continue;
1910 }
1911
1912 /* It may not be necessary to disable the watchpoint to stop over
1913 it. For example, the PA can (with some kernel cooperation)
1914 single step over a watchpoint without disabling the watchpoint. */
1915 if (HAVE_STEPPABLE_WATCHPOINT && STOPPED_BY_WATCHPOINT (ecs->ws))
1916 {
1917 resume (1, 0);
1918 goto wfi_continue;
1919 }
1920
1921 /* It is far more common to need to disable a watchpoint to step
1922 the inferior over it. FIXME. What else might a debug
1923 register or page protection watchpoint scheme need here? */
1924 if (HAVE_NONSTEPPABLE_WATCHPOINT && STOPPED_BY_WATCHPOINT (ecs->ws))
1925 {
1926 /* At this point, we are stopped at an instruction which has
1927 attempted to write to a piece of memory under control of
1928 a watchpoint. The instruction hasn't actually executed
1929 yet. If we were to evaluate the watchpoint expression
1930 now, we would get the old value, and therefore no change
1931 would seem to have occurred.
1932
1933 In order to make watchpoints work `right', we really need
1934 to complete the memory write, and then evaluate the
1935 watchpoint expression. The following code does that by
1936 removing the watchpoint (actually, all watchpoints and
1937 breakpoints), single-stepping the target, re-inserting
1938 watchpoints, and then falling through to let normal
1939 single-step processing handle proceed. Since this
1940 includes evaluating watchpoints, things will come to a
1941 stop in the correct manner. */
1942
1943 write_pc (stop_pc - DECR_PC_AFTER_BREAK);
1944
1945 remove_breakpoints ();
1946 registers_changed ();
1947 target_resume (ecs->pid, 1, TARGET_SIGNAL_0); /* Single step */
1948
1949 ecs->waiton_pid = ecs->pid;
1950 ecs->wp = &(ecs->ws);
1951 ecs->infwait_state = infwait_nonstep_watch_state;
1952 goto wfi_continue;
1953 }
1954
1955 /* It may be possible to simply continue after a watchpoint. */
1956 if (HAVE_CONTINUABLE_WATCHPOINT)
1957 STOPPED_BY_WATCHPOINT (ecs->ws);
1958
1959 ecs->stop_func_start = 0;
1960 ecs->stop_func_end = 0;
1961 ecs->stop_func_name = 0;
1962 /* Don't care about return value; stop_func_start and stop_func_name
1963 will both be 0 if it doesn't work. */
1964 find_pc_partial_function (stop_pc, &ecs->stop_func_name,
1965 &ecs->stop_func_start, &ecs->stop_func_end);
1966 ecs->stop_func_start += FUNCTION_START_OFFSET;
1967 ecs->another_trap = 0;
1968 bpstat_clear (&stop_bpstat);
1969 stop_step = 0;
1970 stop_stack_dummy = 0;
1971 stop_print_frame = 1;
1972 ecs->random_signal = 0;
1973 stopped_by_random_signal = 0;
1974 breakpoints_failed = 0;
1975
1976 /* Look at the cause of the stop, and decide what to do.
1977 The alternatives are:
1978 1) break; to really stop and return to the debugger,
1979 2) drop through to start up again
1980 (set ecs->another_trap to 1 to single step once)
1981 3) set ecs->random_signal to 1, and the decision between 1 and 2
1982 will be made according to the signal handling tables. */
1983
1984 /* First, distinguish signals caused by the debugger from signals
1985 that have to do with the program's own actions.
1986 Note that breakpoint insns may cause SIGTRAP or SIGILL
1987 or SIGEMT, depending on the operating system version.
1988 Here we detect when a SIGILL or SIGEMT is really a breakpoint
1989 and change it to SIGTRAP. */
1990
1991 if (stop_signal == TARGET_SIGNAL_TRAP
1992 || (breakpoints_inserted &&
1993 (stop_signal == TARGET_SIGNAL_ILL
1994 || stop_signal == TARGET_SIGNAL_EMT
1995 ))
1996 || stop_soon_quietly)
1997 {
1998 if (stop_signal == TARGET_SIGNAL_TRAP && stop_after_trap)
1999 {
2000 stop_print_frame = 0;
2001 goto wfi_break;
2002 }
2003 if (stop_soon_quietly)
2004 goto wfi_break;
2005
2006 /* Don't even think about breakpoints
2007 if just proceeded over a breakpoint.
2008
2009 However, if we are trying to proceed over a breakpoint
2010 and end up in sigtramp, then through_sigtramp_breakpoint
2011 will be set and we should check whether we've hit the
2012 step breakpoint. */
2013 if (stop_signal == TARGET_SIGNAL_TRAP && trap_expected
2014 && through_sigtramp_breakpoint == NULL)
2015 bpstat_clear (&stop_bpstat);
2016 else
2017 {
2018 /* See if there is a breakpoint at the current PC. */
2019 stop_bpstat = bpstat_stop_status
2020 (&stop_pc,
2021 (DECR_PC_AFTER_BREAK ?
2022 /* Notice the case of stepping through a jump
2023 that lands just after a breakpoint.
2024 Don't confuse that with hitting the breakpoint.
2025 What we check for is that 1) stepping is going on
2026 and 2) the pc before the last insn does not match
2027 the address of the breakpoint before the current pc
2028 and 3) we didn't hit a breakpoint in a signal handler
2029 without an intervening stop in sigtramp, which is
2030 detected by a new stack pointer value below
2031 any usual function calling stack adjustments. */
2032 (currently_stepping (ecs)
2033 && prev_pc != stop_pc - DECR_PC_AFTER_BREAK
2034 && !(step_range_end
2035 && INNER_THAN (read_sp (), (step_sp - 16)))) :
2036 0)
2037 );
2038 /* Following in case break condition called a
2039 function. */
2040 stop_print_frame = 1;
2041 }
2042
2043 if (stop_signal == TARGET_SIGNAL_TRAP)
2044 ecs->random_signal
2045 = !(bpstat_explains_signal (stop_bpstat)
2046 || trap_expected
2047 || (!CALL_DUMMY_BREAKPOINT_OFFSET_P
2048 && PC_IN_CALL_DUMMY (stop_pc, read_sp (),
2049 FRAME_FP (get_current_frame ())))
2050 || (step_range_end && step_resume_breakpoint == NULL));
2051
2052 else
2053 {
2054 ecs->random_signal
2055 = !(bpstat_explains_signal (stop_bpstat)
2056 /* End of a stack dummy. Some systems (e.g. Sony
2057 news) give another signal besides SIGTRAP, so
2058 check here as well as above. */
2059 || (!CALL_DUMMY_BREAKPOINT_OFFSET_P
2060 && PC_IN_CALL_DUMMY (stop_pc, read_sp (),
2061 FRAME_FP (get_current_frame ())))
2062 );
2063 if (!ecs->random_signal)
2064 stop_signal = TARGET_SIGNAL_TRAP;
2065 }
2066 }
2067
2068 /* When we reach this point, we've pretty much decided
2069 that the reason for stopping must've been a random
2070 (unexpected) signal. */
2071
2072 else
2073 ecs->random_signal = 1;
2074 /* If a fork, vfork or exec event was seen, then there are two
2075 possible responses we can make:
2076
2077 1. If a catchpoint triggers for the event (ecs->random_signal == 0),
2078 then we must stop now and issue a prompt. We will resume
2079 the inferior when the user tells us to.
2080 2. If no catchpoint triggers for the event (ecs->random_signal == 1),
2081 then we must resume the inferior now and keep checking.
2082
2083 In either case, we must take appropriate steps to "follow" the
2084 the fork/vfork/exec when the inferior is resumed. For example,
2085 if follow-fork-mode is "child", then we must detach from the
2086 parent inferior and follow the new child inferior.
2087
2088 In either case, setting pending_follow causes the next resume()
2089 to take the appropriate following action. */
2090 process_event_stop_test:
2091 if (ecs->ws.kind == TARGET_WAITKIND_FORKED)
2092 {
2093 if (ecs->random_signal) /* I.e., no catchpoint triggered for this. */
2094 {
2095 trap_expected = 1;
2096 stop_signal = TARGET_SIGNAL_0;
2097 goto keep_going;
2098 }
2099 }
2100 else if (ecs->ws.kind == TARGET_WAITKIND_VFORKED)
2101 {
2102 if (ecs->random_signal) /* I.e., no catchpoint triggered for this. */
2103 {
2104 stop_signal = TARGET_SIGNAL_0;
2105 goto keep_going;
2106 }
2107 }
2108 else if (ecs->ws.kind == TARGET_WAITKIND_EXECD)
2109 {
2110 pending_follow.kind = ecs->ws.kind;
2111 if (ecs->random_signal) /* I.e., no catchpoint triggered for this. */
2112 {
2113 trap_expected = 1;
2114 stop_signal = TARGET_SIGNAL_0;
2115 goto keep_going;
2116 }
2117 }
2118
2119 /* For the program's own signals, act according to
2120 the signal handling tables. */
2121
2122 if (ecs->random_signal)
2123 {
2124 /* Signal not for debugging purposes. */
2125 int printed = 0;
2126
2127 stopped_by_random_signal = 1;
2128
2129 if (signal_print[stop_signal])
2130 {
2131 printed = 1;
2132 target_terminal_ours_for_output ();
2133 annotate_signal ();
2134 printf_filtered ("\nProgram received signal ");
2135 annotate_signal_name ();
2136 printf_filtered ("%s", target_signal_to_name (stop_signal));
2137 annotate_signal_name_end ();
2138 printf_filtered (", ");
2139 annotate_signal_string ();
2140 printf_filtered ("%s", target_signal_to_string (stop_signal));
2141 annotate_signal_string_end ();
2142 printf_filtered (".\n");
2143 gdb_flush (gdb_stdout);
2144 }
2145 if (signal_stop[stop_signal])
2146 goto wfi_break;
2147 /* If not going to stop, give terminal back
2148 if we took it away. */
2149 else if (printed)
2150 target_terminal_inferior ();
2151
2152 /* Clear the signal if it should not be passed. */
2153 if (signal_program[stop_signal] == 0)
2154 stop_signal = TARGET_SIGNAL_0;
2155
2156 /* I'm not sure whether this needs to be check_sigtramp2 or
2157 whether it could/should be keep_going.
2158
2159 This used to jump to step_over_function if we are stepping,
2160 which is wrong.
2161
2162 Suppose the user does a `next' over a function call, and while
2163 that call is in progress, the inferior receives a signal for
2164 which GDB does not stop (i.e., signal_stop[SIG] is false). In
2165 that case, when we reach this point, there is already a
2166 step-resume breakpoint established, right where it should be:
2167 immediately after the function call the user is "next"-ing
2168 over. If we jump to step_over_function now, two bad things
2169 happen:
2170
2171 - we'll create a new breakpoint, at wherever the current
2172 frame's return address happens to be. That could be
2173 anywhere, depending on what function call happens to be on
2174 the top of the stack at that point. Point is, it's probably
2175 not where we need it.
2176
2177 - the existing step-resume breakpoint (which is at the correct
2178 address) will get orphaned: step_resume_breakpoint will point
2179 to the new breakpoint, and the old step-resume breakpoint
2180 will never be cleaned up.
2181
2182 The old behavior was meant to help HP-UX single-step out of
2183 sigtramps. It would place the new breakpoint at prev_pc, which
2184 was certainly wrong. I don't know the details there, so fixing
2185 this probably breaks that. As with anything else, it's up to
2186 the HP-UX maintainer to furnish a fix that doesn't break other
2187 platforms. --JimB, 20 May 1999 */
2188 goto check_sigtramp2;
2189 }
2190
2191 /* Handle cases caused by hitting a breakpoint. */
2192 {
2193 CORE_ADDR jmp_buf_pc;
2194 struct bpstat_what what;
2195
2196 what = bpstat_what (stop_bpstat);
2197
2198 if (what.call_dummy)
2199 {
2200 stop_stack_dummy = 1;
2201 #ifdef HP_OS_BUG
2202 trap_expected_after_continue = 1;
2203 #endif
2204 }
2205
2206 switch (what.main_action)
2207 {
2208 case BPSTAT_WHAT_SET_LONGJMP_RESUME:
2209 /* If we hit the breakpoint at longjmp, disable it for the
2210 duration of this command. Then, install a temporary
2211 breakpoint at the target of the jmp_buf. */
2212 disable_longjmp_breakpoint ();
2213 remove_breakpoints ();
2214 breakpoints_inserted = 0;
2215 if (!GET_LONGJMP_TARGET (&jmp_buf_pc))
2216 goto keep_going;
2217
2218 /* Need to blow away step-resume breakpoint, as it
2219 interferes with us */
2220 if (step_resume_breakpoint != NULL)
2221 {
2222 delete_breakpoint (step_resume_breakpoint);
2223 step_resume_breakpoint = NULL;
2224 }
2225 /* Not sure whether we need to blow this away too, but probably
2226 it is like the step-resume breakpoint. */
2227 if (through_sigtramp_breakpoint != NULL)
2228 {
2229 delete_breakpoint (through_sigtramp_breakpoint);
2230 through_sigtramp_breakpoint = NULL;
2231 }
2232
2233 #if 0
2234 /* FIXME - Need to implement nested temporary breakpoints */
2235 if (step_over_calls > 0)
2236 set_longjmp_resume_breakpoint (jmp_buf_pc,
2237 get_current_frame ());
2238 else
2239 #endif /* 0 */
2240 set_longjmp_resume_breakpoint (jmp_buf_pc, NULL);
2241 ecs->handling_longjmp = 1; /* FIXME */
2242 goto keep_going;
2243
2244 case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME:
2245 case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME_SINGLE:
2246 remove_breakpoints ();
2247 breakpoints_inserted = 0;
2248 #if 0
2249 /* FIXME - Need to implement nested temporary breakpoints */
2250 if (step_over_calls
2251 && (INNER_THAN (FRAME_FP (get_current_frame ()),
2252 step_frame_address)))
2253 {
2254 ecs->another_trap = 1;
2255 goto keep_going;
2256 }
2257 #endif /* 0 */
2258 disable_longjmp_breakpoint ();
2259 ecs->handling_longjmp = 0; /* FIXME */
2260 if (what.main_action == BPSTAT_WHAT_CLEAR_LONGJMP_RESUME)
2261 break;
2262 /* else fallthrough */
2263
2264 case BPSTAT_WHAT_SINGLE:
2265 if (breakpoints_inserted)
2266 {
2267 thread_step_needed = 1;
2268 remove_breakpoints ();
2269 }
2270 breakpoints_inserted = 0;
2271 ecs->another_trap = 1;
2272 /* Still need to check other stuff, at least the case
2273 where we are stepping and step out of the right range. */
2274 break;
2275
2276 case BPSTAT_WHAT_STOP_NOISY:
2277 stop_print_frame = 1;
2278
2279 /* We are about to nuke the step_resume_breakpoint and
2280 through_sigtramp_breakpoint via the cleanup chain, so
2281 no need to worry about it here. */
2282
2283 goto stop_stepping;
2284
2285 case BPSTAT_WHAT_STOP_SILENT:
2286 stop_print_frame = 0;
2287
2288 /* We are about to nuke the step_resume_breakpoint and
2289 through_sigtramp_breakpoint via the cleanup chain, so
2290 no need to worry about it here. */
2291
2292 goto stop_stepping;
2293
2294 case BPSTAT_WHAT_STEP_RESUME:
2295 /* This proably demands a more elegant solution, but, yeah
2296 right...
2297
2298 This function's use of the simple variable
2299 step_resume_breakpoint doesn't seem to accomodate
2300 simultaneously active step-resume bp's, although the
2301 breakpoint list certainly can.
2302
2303 If we reach here and step_resume_breakpoint is already
2304 NULL, then apparently we have multiple active
2305 step-resume bp's. We'll just delete the breakpoint we
2306 stopped at, and carry on. */
2307 if (step_resume_breakpoint == NULL)
2308 {
2309 step_resume_breakpoint =
2310 bpstat_find_step_resume_breakpoint (stop_bpstat);
2311 }
2312 delete_breakpoint (step_resume_breakpoint);
2313 step_resume_breakpoint = NULL;
2314 break;
2315
2316 case BPSTAT_WHAT_THROUGH_SIGTRAMP:
2317 if (through_sigtramp_breakpoint)
2318 delete_breakpoint (through_sigtramp_breakpoint);
2319 through_sigtramp_breakpoint = NULL;
2320
2321 /* If were waiting for a trap, hitting the step_resume_break
2322 doesn't count as getting it. */
2323 if (trap_expected)
2324 ecs->another_trap = 1;
2325 break;
2326
2327 case BPSTAT_WHAT_CHECK_SHLIBS:
2328 case BPSTAT_WHAT_CHECK_SHLIBS_RESUME_FROM_HOOK:
2329 #ifdef SOLIB_ADD
2330 {
2331 /* Remove breakpoints, we eventually want to step over the
2332 shlib event breakpoint, and SOLIB_ADD might adjust
2333 breakpoint addresses via breakpoint_re_set. */
2334 if (breakpoints_inserted)
2335 remove_breakpoints ();
2336 breakpoints_inserted = 0;
2337
2338 /* Check for any newly added shared libraries if we're
2339 supposed to be adding them automatically. */
2340 if (auto_solib_add)
2341 {
2342 /* Switch terminal for any messages produced by
2343 breakpoint_re_set. */
2344 target_terminal_ours_for_output ();
2345 SOLIB_ADD (NULL, 0, NULL);
2346 target_terminal_inferior ();
2347 }
2348
2349 /* Try to reenable shared library breakpoints, additional
2350 code segments in shared libraries might be mapped in now. */
2351 re_enable_breakpoints_in_shlibs ();
2352
2353 /* If requested, stop when the dynamic linker notifies
2354 gdb of events. This allows the user to get control
2355 and place breakpoints in initializer routines for
2356 dynamically loaded objects (among other things). */
2357 if (stop_on_solib_events)
2358 {
2359 stop_print_frame = 0;
2360 goto stop_stepping;
2361 }
2362
2363 /* If we stopped due to an explicit catchpoint, then the
2364 (see above) call to SOLIB_ADD pulled in any symbols
2365 from a newly-loaded library, if appropriate.
2366
2367 We do want the inferior to stop, but not where it is
2368 now, which is in the dynamic linker callback. Rather,
2369 we would like it stop in the user's program, just after
2370 the call that caused this catchpoint to trigger. That
2371 gives the user a more useful vantage from which to
2372 examine their program's state. */
2373 else if (what.main_action == BPSTAT_WHAT_CHECK_SHLIBS_RESUME_FROM_HOOK)
2374 {
2375 /* ??rehrauer: If I could figure out how to get the
2376 right return PC from here, we could just set a temp
2377 breakpoint and resume. I'm not sure we can without
2378 cracking open the dld's shared libraries and sniffing
2379 their unwind tables and text/data ranges, and that's
2380 not a terribly portable notion.
2381
2382 Until that time, we must step the inferior out of the
2383 dld callback, and also out of the dld itself (and any
2384 code or stubs in libdld.sl, such as "shl_load" and
2385 friends) until we reach non-dld code. At that point,
2386 we can stop stepping. */
2387 bpstat_get_triggered_catchpoints (stop_bpstat,
2388 &ecs->stepping_through_solib_catchpoints);
2389 ecs->stepping_through_solib_after_catch = 1;
2390
2391 /* Be sure to lift all breakpoints, so the inferior does
2392 actually step past this point... */
2393 ecs->another_trap = 1;
2394 break;
2395 }
2396 else
2397 {
2398 /* We want to step over this breakpoint, then keep going. */
2399 ecs->another_trap = 1;
2400 break;
2401 }
2402 }
2403 #endif
2404 break;
2405
2406 case BPSTAT_WHAT_LAST:
2407 /* Not a real code, but listed here to shut up gcc -Wall. */
2408
2409 case BPSTAT_WHAT_KEEP_CHECKING:
2410 break;
2411 }
2412 }
2413
2414 /* We come here if we hit a breakpoint but should not
2415 stop for it. Possibly we also were stepping
2416 and should stop for that. So fall through and
2417 test for stepping. But, if not stepping,
2418 do not stop. */
2419
2420 /* Are we stepping to get the inferior out of the dynamic
2421 linker's hook (and possibly the dld itself) after catching
2422 a shlib event? */
2423 if (ecs->stepping_through_solib_after_catch)
2424 {
2425 #if defined(SOLIB_ADD)
2426 /* Have we reached our destination? If not, keep going. */
2427 if (SOLIB_IN_DYNAMIC_LINKER (ecs->pid, stop_pc))
2428 {
2429 ecs->another_trap = 1;
2430 goto keep_going;
2431 }
2432 #endif
2433 /* Else, stop and report the catchpoint(s) whose triggering
2434 caused us to begin stepping. */
2435 ecs->stepping_through_solib_after_catch = 0;
2436 bpstat_clear (&stop_bpstat);
2437 stop_bpstat = bpstat_copy (ecs->stepping_through_solib_catchpoints);
2438 bpstat_clear (&ecs->stepping_through_solib_catchpoints);
2439 stop_print_frame = 1;
2440 goto stop_stepping;
2441 }
2442
2443 if (!CALL_DUMMY_BREAKPOINT_OFFSET_P)
2444 {
2445 /* This is the old way of detecting the end of the stack dummy.
2446 An architecture which defines CALL_DUMMY_BREAKPOINT_OFFSET gets
2447 handled above. As soon as we can test it on all of them, all
2448 architectures should define it. */
2449
2450 /* If this is the breakpoint at the end of a stack dummy,
2451 just stop silently, unless the user was doing an si/ni, in which
2452 case she'd better know what she's doing. */
2453
2454 if (CALL_DUMMY_HAS_COMPLETED (stop_pc, read_sp (),
2455 FRAME_FP (get_current_frame ()))
2456 && !step_range_end)
2457 {
2458 stop_print_frame = 0;
2459 stop_stack_dummy = 1;
2460 #ifdef HP_OS_BUG
2461 trap_expected_after_continue = 1;
2462 #endif
2463 goto wfi_break;
2464 }
2465 }
2466
2467 if (step_resume_breakpoint)
2468 /* Having a step-resume breakpoint overrides anything
2469 else having to do with stepping commands until
2470 that breakpoint is reached. */
2471 /* I'm not sure whether this needs to be check_sigtramp2 or
2472 whether it could/should be keep_going. */
2473 goto check_sigtramp2;
2474
2475 if (step_range_end == 0)
2476 /* Likewise if we aren't even stepping. */
2477 /* I'm not sure whether this needs to be check_sigtramp2 or
2478 whether it could/should be keep_going. */
2479 goto check_sigtramp2;
2480
2481 /* If stepping through a line, keep going if still within it.
2482
2483 Note that step_range_end is the address of the first instruction
2484 beyond the step range, and NOT the address of the last instruction
2485 within it! */
2486 if (stop_pc >= step_range_start
2487 && stop_pc < step_range_end)
2488 {
2489 /* We might be doing a BPSTAT_WHAT_SINGLE and getting a signal.
2490 So definately need to check for sigtramp here. */
2491 goto check_sigtramp2;
2492 }
2493
2494 /* We stepped out of the stepping range. */
2495
2496 /* If we are stepping at the source level and entered the runtime
2497 loader dynamic symbol resolution code, we keep on single stepping
2498 until we exit the run time loader code and reach the callee's
2499 address. */
2500 if (step_over_calls < 0 && IN_SOLIB_DYNSYM_RESOLVE_CODE (stop_pc))
2501 goto keep_going;
2502
2503 /* We can't update step_sp every time through the loop, because
2504 reading the stack pointer would slow down stepping too much.
2505 But we can update it every time we leave the step range. */
2506 ecs->update_step_sp = 1;
2507
2508 /* Did we just take a signal? */
2509 if (IN_SIGTRAMP (stop_pc, ecs->stop_func_name)
2510 && !IN_SIGTRAMP (prev_pc, prev_func_name)
2511 && INNER_THAN (read_sp (), step_sp))
2512 {
2513 /* We've just taken a signal; go until we are back to
2514 the point where we took it and one more. */
2515
2516 /* Note: The test above succeeds not only when we stepped
2517 into a signal handler, but also when we step past the last
2518 statement of a signal handler and end up in the return stub
2519 of the signal handler trampoline. To distinguish between
2520 these two cases, check that the frame is INNER_THAN the
2521 previous one below. pai/1997-09-11 */
2522
2523
2524 {
2525 CORE_ADDR current_frame = FRAME_FP (get_current_frame ());
2526
2527 if (INNER_THAN (current_frame, step_frame_address))
2528 {
2529 /* We have just taken a signal; go until we are back to
2530 the point where we took it and one more. */
2531
2532 /* This code is needed at least in the following case:
2533 The user types "next" and then a signal arrives (before
2534 the "next" is done). */
2535
2536 /* Note that if we are stopped at a breakpoint, then we need
2537 the step_resume breakpoint to override any breakpoints at
2538 the same location, so that we will still step over the
2539 breakpoint even though the signal happened. */
2540 struct symtab_and_line sr_sal;
2541
2542 INIT_SAL (&sr_sal);
2543 sr_sal.symtab = NULL;
2544 sr_sal.line = 0;
2545 sr_sal.pc = prev_pc;
2546 /* We could probably be setting the frame to
2547 step_frame_address; I don't think anyone thought to
2548 try it. */
2549 check_for_old_step_resume_breakpoint ();
2550 step_resume_breakpoint =
2551 set_momentary_breakpoint (sr_sal, NULL, bp_step_resume);
2552 if (breakpoints_inserted)
2553 insert_breakpoints ();
2554 }
2555 else
2556 {
2557 /* We just stepped out of a signal handler and into
2558 its calling trampoline.
2559
2560 Normally, we'd jump to step_over_function from
2561 here, but for some reason GDB can't unwind the
2562 stack correctly to find the real PC for the point
2563 user code where the signal trampoline will return
2564 -- FRAME_SAVED_PC fails, at least on HP-UX 10.20.
2565 But signal trampolines are pretty small stubs of
2566 code, anyway, so it's OK instead to just
2567 single-step out. Note: assuming such trampolines
2568 don't exhibit recursion on any platform... */
2569 find_pc_partial_function (stop_pc, &ecs->stop_func_name,
2570 &ecs->stop_func_start,
2571 &ecs->stop_func_end);
2572 /* Readjust stepping range */
2573 step_range_start = ecs->stop_func_start;
2574 step_range_end = ecs->stop_func_end;
2575 ecs->stepping_through_sigtramp = 1;
2576 }
2577 }
2578
2579
2580 /* If this is stepi or nexti, make sure that the stepping range
2581 gets us past that instruction. */
2582 if (step_range_end == 1)
2583 /* FIXME: Does this run afoul of the code below which, if
2584 we step into the middle of a line, resets the stepping
2585 range? */
2586 step_range_end = (step_range_start = prev_pc) + 1;
2587
2588 ecs->remove_breakpoints_on_following_step = 1;
2589 goto keep_going;
2590 }
2591
2592 if (stop_pc == ecs->stop_func_start /* Quick test */
2593 || (in_prologue (stop_pc, ecs->stop_func_start) &&
2594 !IN_SOLIB_RETURN_TRAMPOLINE (stop_pc, ecs->stop_func_name))
2595 || IN_SOLIB_CALL_TRAMPOLINE (stop_pc, ecs->stop_func_name)
2596 || ecs->stop_func_name == 0)
2597 {
2598 /* It's a subroutine call. */
2599
2600 if (step_over_calls == 0)
2601 {
2602 /* I presume that step_over_calls is only 0 when we're
2603 supposed to be stepping at the assembly language level
2604 ("stepi"). Just stop. */
2605 stop_step = 1;
2606 goto wfi_break;
2607 }
2608
2609 if (step_over_calls > 0 || IGNORE_HELPER_CALL (stop_pc))
2610 /* We're doing a "next". */
2611 goto step_over_function;
2612
2613 /* If we are in a function call trampoline (a stub between
2614 the calling routine and the real function), locate the real
2615 function. That's what tells us (a) whether we want to step
2616 into it at all, and (b) what prologue we want to run to
2617 the end of, if we do step into it. */
2618 tmp = SKIP_TRAMPOLINE_CODE (stop_pc);
2619 if (tmp != 0)
2620 ecs->stop_func_start = tmp;
2621 else
2622 {
2623 tmp = DYNAMIC_TRAMPOLINE_NEXTPC (stop_pc);
2624 if (tmp)
2625 {
2626 struct symtab_and_line xxx;
2627 /* Why isn't this s_a_l called "sr_sal", like all of the
2628 other s_a_l's where this code is duplicated? */
2629 INIT_SAL (&xxx); /* initialize to zeroes */
2630 xxx.pc = tmp;
2631 xxx.section = find_pc_overlay (xxx.pc);
2632 check_for_old_step_resume_breakpoint ();
2633 step_resume_breakpoint =
2634 set_momentary_breakpoint (xxx, NULL, bp_step_resume);
2635 insert_breakpoints ();
2636 goto keep_going;
2637 }
2638 }
2639
2640 /* If we have line number information for the function we
2641 are thinking of stepping into, step into it.
2642
2643 If there are several symtabs at that PC (e.g. with include
2644 files), just want to know whether *any* of them have line
2645 numbers. find_pc_line handles this. */
2646 {
2647 struct symtab_and_line tmp_sal;
2648
2649 tmp_sal = find_pc_line (ecs->stop_func_start, 0);
2650 if (tmp_sal.line != 0)
2651 goto step_into_function;
2652 }
2653
2654 step_over_function:
2655 /* A subroutine call has happened. */
2656 {
2657 /* We've just entered a callee, and we wish to resume until it
2658 returns to the caller. Setting a step_resume breakpoint on
2659 the return address will catch a return from the callee.
2660
2661 However, if the callee is recursing, we want to be careful
2662 not to catch returns of those recursive calls, but only of
2663 THIS instance of the call.
2664
2665 To do this, we set the step_resume bp's frame to our current
2666 caller's frame (step_frame_address, which is set by the "next"
2667 or "until" command, before execution begins). */
2668 struct symtab_and_line sr_sal;
2669
2670 INIT_SAL (&sr_sal); /* initialize to zeros */
2671 sr_sal.pc =
2672 ADDR_BITS_REMOVE (SAVED_PC_AFTER_CALL (get_current_frame ()));
2673 sr_sal.section = find_pc_overlay (sr_sal.pc);
2674
2675 check_for_old_step_resume_breakpoint ();
2676 step_resume_breakpoint =
2677 set_momentary_breakpoint (sr_sal, get_current_frame (),
2678 bp_step_resume);
2679
2680 if (!IN_SOLIB_DYNSYM_RESOLVE_CODE (sr_sal.pc))
2681 step_resume_breakpoint->frame = step_frame_address;
2682
2683 if (breakpoints_inserted)
2684 insert_breakpoints ();
2685 }
2686 goto keep_going;
2687
2688 step_into_function:
2689 /* Subroutine call with source code we should not step over.
2690 Do step to the first line of code in it. */
2691 {
2692 struct symtab *s;
2693
2694 s = find_pc_symtab (stop_pc);
2695 if (s && s->language != language_asm)
2696 ecs->stop_func_start = SKIP_PROLOGUE (ecs->stop_func_start);
2697 }
2698 ecs->sal = find_pc_line (ecs->stop_func_start, 0);
2699 /* Use the step_resume_break to step until
2700 the end of the prologue, even if that involves jumps
2701 (as it seems to on the vax under 4.2). */
2702 /* If the prologue ends in the middle of a source line,
2703 continue to the end of that source line (if it is still
2704 within the function). Otherwise, just go to end of prologue. */
2705 #ifdef PROLOGUE_FIRSTLINE_OVERLAP
2706 /* no, don't either. It skips any code that's
2707 legitimately on the first line. */
2708 #else
2709 if (ecs->sal.end && ecs->sal.pc != ecs->stop_func_start && ecs->sal.end < ecs->stop_func_end)
2710 ecs->stop_func_start = ecs->sal.end;
2711 #endif
2712
2713 if (ecs->stop_func_start == stop_pc)
2714 {
2715 /* We are already there: stop now. */
2716 stop_step = 1;
2717 goto wfi_break;
2718 }
2719 else
2720 /* Put the step-breakpoint there and go until there. */
2721 {
2722 struct symtab_and_line sr_sal;
2723
2724 INIT_SAL (&sr_sal); /* initialize to zeroes */
2725 sr_sal.pc = ecs->stop_func_start;
2726 sr_sal.section = find_pc_overlay (ecs->stop_func_start);
2727 /* Do not specify what the fp should be when we stop
2728 since on some machines the prologue
2729 is where the new fp value is established. */
2730 check_for_old_step_resume_breakpoint ();
2731 step_resume_breakpoint =
2732 set_momentary_breakpoint (sr_sal, NULL, bp_step_resume);
2733 if (breakpoints_inserted)
2734 insert_breakpoints ();
2735
2736 /* And make sure stepping stops right away then. */
2737 step_range_end = step_range_start;
2738 }
2739 goto keep_going;
2740 }
2741
2742 /* We've wandered out of the step range. */
2743
2744 ecs->sal = find_pc_line (stop_pc, 0);
2745
2746 if (step_range_end == 1)
2747 {
2748 /* It is stepi or nexti. We always want to stop stepping after
2749 one instruction. */
2750 stop_step = 1;
2751 goto wfi_break;
2752 }
2753
2754 /* If we're in the return path from a shared library trampoline,
2755 we want to proceed through the trampoline when stepping. */
2756 if (IN_SOLIB_RETURN_TRAMPOLINE (stop_pc, ecs->stop_func_name))
2757 {
2758 CORE_ADDR tmp;
2759
2760 /* Determine where this trampoline returns. */
2761 tmp = SKIP_TRAMPOLINE_CODE (stop_pc);
2762
2763 /* Only proceed through if we know where it's going. */
2764 if (tmp)
2765 {
2766 /* And put the step-breakpoint there and go until there. */
2767 struct symtab_and_line sr_sal;
2768
2769 INIT_SAL (&sr_sal); /* initialize to zeroes */
2770 sr_sal.pc = tmp;
2771 sr_sal.section = find_pc_overlay (sr_sal.pc);
2772 /* Do not specify what the fp should be when we stop
2773 since on some machines the prologue
2774 is where the new fp value is established. */
2775 check_for_old_step_resume_breakpoint ();
2776 step_resume_breakpoint =
2777 set_momentary_breakpoint (sr_sal, NULL, bp_step_resume);
2778 if (breakpoints_inserted)
2779 insert_breakpoints ();
2780
2781 /* Restart without fiddling with the step ranges or
2782 other state. */
2783 goto keep_going;
2784 }
2785 }
2786
2787 if (ecs->sal.line == 0)
2788 {
2789 /* We have no line number information. That means to stop
2790 stepping (does this always happen right after one instruction,
2791 when we do "s" in a function with no line numbers,
2792 or can this happen as a result of a return or longjmp?). */
2793 stop_step = 1;
2794 goto wfi_break;
2795 }
2796
2797 if ((stop_pc == ecs->sal.pc)
2798 && (ecs->current_line != ecs->sal.line || ecs->current_symtab != ecs->sal.symtab))
2799 {
2800 /* We are at the start of a different line. So stop. Note that
2801 we don't stop if we step into the middle of a different line.
2802 That is said to make things like for (;;) statements work
2803 better. */
2804 stop_step = 1;
2805 goto wfi_break;
2806 }
2807
2808 /* We aren't done stepping.
2809
2810 Optimize by setting the stepping range to the line.
2811 (We might not be in the original line, but if we entered a
2812 new line in mid-statement, we continue stepping. This makes
2813 things like for(;;) statements work better.) */
2814
2815 if (ecs->stop_func_end && ecs->sal.end >= ecs->stop_func_end)
2816 {
2817 /* If this is the last line of the function, don't keep stepping
2818 (it would probably step us out of the function).
2819 This is particularly necessary for a one-line function,
2820 in which after skipping the prologue we better stop even though
2821 we will be in mid-line. */
2822 stop_step = 1;
2823 goto wfi_break;
2824 }
2825 step_range_start = ecs->sal.pc;
2826 step_range_end = ecs->sal.end;
2827 step_frame_address = FRAME_FP (get_current_frame ());
2828 ecs->current_line = ecs->sal.line;
2829 ecs->current_symtab = ecs->sal.symtab;
2830
2831 /* In the case where we just stepped out of a function into the middle
2832 of a line of the caller, continue stepping, but step_frame_address
2833 must be modified to current frame */
2834 {
2835 CORE_ADDR current_frame = FRAME_FP (get_current_frame ());
2836 if (!(INNER_THAN (current_frame, step_frame_address)))
2837 step_frame_address = current_frame;
2838 }
2839
2840
2841 goto keep_going;
2842
2843 check_sigtramp2:
2844 if (trap_expected
2845 && IN_SIGTRAMP (stop_pc, ecs->stop_func_name)
2846 && !IN_SIGTRAMP (prev_pc, prev_func_name)
2847 && INNER_THAN (read_sp (), step_sp))
2848 {
2849 /* What has happened here is that we have just stepped the inferior
2850 with a signal (because it is a signal which shouldn't make
2851 us stop), thus stepping into sigtramp.
2852
2853 So we need to set a step_resume_break_address breakpoint
2854 and continue until we hit it, and then step. FIXME: This should
2855 be more enduring than a step_resume breakpoint; we should know
2856 that we will later need to keep going rather than re-hitting
2857 the breakpoint here (see testsuite/gdb.t06/signals.exp where
2858 it says "exceedingly difficult"). */
2859 struct symtab_and_line sr_sal;
2860
2861 INIT_SAL (&sr_sal); /* initialize to zeroes */
2862 sr_sal.pc = prev_pc;
2863 sr_sal.section = find_pc_overlay (sr_sal.pc);
2864 /* We perhaps could set the frame if we kept track of what
2865 the frame corresponding to prev_pc was. But we don't,
2866 so don't. */
2867 through_sigtramp_breakpoint =
2868 set_momentary_breakpoint (sr_sal, NULL, bp_through_sigtramp);
2869 if (breakpoints_inserted)
2870 insert_breakpoints ();
2871
2872 ecs->remove_breakpoints_on_following_step = 1;
2873 ecs->another_trap = 1;
2874 }
2875
2876 keep_going:
2877 /* Come to this label when you need to resume the inferior.
2878 It's really much cleaner to do a goto than a maze of if-else
2879 conditions. */
2880
2881 /* ??rehrauer: ttrace on HP-UX theoretically allows one to debug
2882 a vforked child beetween its creation and subsequent exit or
2883 call to exec(). However, I had big problems in this rather
2884 creaky exec engine, getting that to work. The fundamental
2885 problem is that I'm trying to debug two processes via an
2886 engine that only understands a single process with possibly
2887 multiple threads.
2888
2889 Hence, this spot is known to have problems when
2890 target_can_follow_vfork_prior_to_exec returns 1. */
2891
2892 /* Save the pc before execution, to compare with pc after stop. */
2893 prev_pc = read_pc (); /* Might have been DECR_AFTER_BREAK */
2894 prev_func_start = ecs->stop_func_start; /* Ok, since if DECR_PC_AFTER
2895 BREAK is defined, the
2896 original pc would not have
2897 been at the start of a
2898 function. */
2899 prev_func_name = ecs->stop_func_name;
2900
2901 if (ecs->update_step_sp)
2902 step_sp = read_sp ();
2903 ecs->update_step_sp = 0;
2904
2905 /* If we did not do break;, it means we should keep
2906 running the inferior and not return to debugger. */
2907
2908 if (trap_expected && stop_signal != TARGET_SIGNAL_TRAP)
2909 {
2910 /* We took a signal (which we are supposed to pass through to
2911 the inferior, else we'd have done a break above) and we
2912 haven't yet gotten our trap. Simply continue. */
2913 resume (currently_stepping (ecs), stop_signal);
2914 }
2915 else
2916 {
2917 /* Either the trap was not expected, but we are continuing
2918 anyway (the user asked that this signal be passed to the
2919 child)
2920 -- or --
2921 The signal was SIGTRAP, e.g. it was our signal, but we
2922 decided we should resume from it.
2923
2924 We're going to run this baby now!
2925
2926 Insert breakpoints now, unless we are trying
2927 to one-proceed past a breakpoint. */
2928 /* If we've just finished a special step resume and we don't
2929 want to hit a breakpoint, pull em out. */
2930 if (step_resume_breakpoint == NULL
2931 && through_sigtramp_breakpoint == NULL
2932 && ecs->remove_breakpoints_on_following_step)
2933 {
2934 ecs->remove_breakpoints_on_following_step = 0;
2935 remove_breakpoints ();
2936 breakpoints_inserted = 0;
2937 }
2938 else if (!breakpoints_inserted &&
2939 (through_sigtramp_breakpoint != NULL || !ecs->another_trap))
2940 {
2941 breakpoints_failed = insert_breakpoints ();
2942 if (breakpoints_failed)
2943 goto wfi_break;
2944 breakpoints_inserted = 1;
2945 }
2946
2947 trap_expected = ecs->another_trap;
2948
2949 /* Do not deliver SIGNAL_TRAP (except when the user
2950 explicitly specifies that such a signal should be
2951 delivered to the target program).
2952
2953 Typically, this would occure when a user is debugging a
2954 target monitor on a simulator: the target monitor sets a
2955 breakpoint; the simulator encounters this break-point and
2956 halts the simulation handing control to GDB; GDB, noteing
2957 that the break-point isn't valid, returns control back to
2958 the simulator; the simulator then delivers the hardware
2959 equivalent of a SIGNAL_TRAP to the program being
2960 debugged. */
2961
2962 if (stop_signal == TARGET_SIGNAL_TRAP
2963 && !signal_program[stop_signal])
2964 stop_signal = TARGET_SIGNAL_0;
2965
2966 #ifdef SHIFT_INST_REGS
2967 /* I'm not sure when this following segment applies. I do know,
2968 now, that we shouldn't rewrite the regs when we were stopped
2969 by a random signal from the inferior process. */
2970 /* FIXME: Shouldn't this be based on the valid bit of the SXIP?
2971 (this is only used on the 88k). */
2972
2973 if (!bpstat_explains_signal (stop_bpstat)
2974 && (stop_signal != TARGET_SIGNAL_CHLD)
2975 && !stopped_by_random_signal)
2976 SHIFT_INST_REGS ();
2977 #endif /* SHIFT_INST_REGS */
2978
2979 resume (currently_stepping (ecs), stop_signal);
2980 }
2981
2982 /* Former continues in the main loop goto here. */
2983 wfi_continue:
2984 /* This used to be at the top of the loop. */
2985 if (ecs->infwait_state == infwait_normal_state)
2986 {
2987 overlay_cache_invalid = 1;
2988
2989 /* We have to invalidate the registers BEFORE calling
2990 target_wait because they can be loaded from the target
2991 while in target_wait. This makes remote debugging a bit
2992 more efficient for those targets that provide critical
2993 registers as part of their normal status mechanism. */
2994
2995 registers_changed ();
2996 ecs->waiton_pid = -1;
2997 ecs->wp = &(ecs->ws);
2998 }
2999 /* This is the old end of the while loop. Let everybody know
3000 we want to wait for the inferior some more and get called
3001 again soon. */
3002 ecs->wait_some_more = 1;
3003 return;
3004 }
3005
3006 /* Former breaks in the main loop goto here. */
3007 wfi_break:
3008
3009 stop_stepping:
3010 if (target_has_execution)
3011 {
3012 /* Are we stopping for a vfork event? We only stop when we see
3013 the child's event. However, we may not yet have seen the
3014 parent's event. And, inferior_pid is still set to the parent's
3015 pid, until we resume again and follow either the parent or child.
3016
3017 To ensure that we can really touch inferior_pid (aka, the
3018 parent process) -- which calls to functions like read_pc
3019 implicitly do -- wait on the parent if necessary. */
3020 if ((pending_follow.kind == TARGET_WAITKIND_VFORKED)
3021 && !pending_follow.fork_event.saw_parent_fork)
3022 {
3023 int parent_pid;
3024
3025 do
3026 {
3027 if (target_wait_hook)
3028 parent_pid = target_wait_hook (-1, &(ecs->ws));
3029 else
3030 parent_pid = target_wait (-1, &(ecs->ws));
3031 }
3032 while (parent_pid != inferior_pid);
3033 }
3034
3035 /* Assuming the inferior still exists, set these up for next
3036 time, just like we did above if we didn't break out of the
3037 loop. */
3038 prev_pc = read_pc ();
3039 prev_func_start = ecs->stop_func_start;
3040 prev_func_name = ecs->stop_func_name;
3041 }
3042 /* Let callers know we don't want to wait for the inferior anymore. */
3043 ecs->wait_some_more = 0;
3044 }
3045
3046 /* Are we in the middle of stepping? */
3047
3048 static int
3049 currently_stepping (ecs)
3050 struct execution_control_state *ecs;
3051 {
3052 return ((through_sigtramp_breakpoint == NULL
3053 && !ecs->handling_longjmp
3054 && ((step_range_end && step_resume_breakpoint == NULL)
3055 || trap_expected))
3056 || ecs->stepping_through_solib_after_catch
3057 || bpstat_should_step ());
3058 }
3059
3060 /* This function returns TRUE if ep is an internal breakpoint
3061 set to catch generic shared library (aka dynamically-linked
3062 library) events. (This is *NOT* the same as a catchpoint for a
3063 shlib event. The latter is something a user can set; this is
3064 something gdb sets for its own use, and isn't ever shown to a
3065 user.) */
3066 static int
3067 is_internal_shlib_eventpoint (ep)
3068 struct breakpoint *ep;
3069 {
3070 return
3071 (ep->type == bp_shlib_event)
3072 ;
3073 }
3074
3075 /* This function returns TRUE if bs indicates that the inferior
3076 stopped due to a shared library (aka dynamically-linked library)
3077 event. */
3078 static int
3079 stopped_for_internal_shlib_event (bs)
3080 bpstat bs;
3081 {
3082 /* Note that multiple eventpoints may've caused the stop. Any
3083 that are associated with shlib events will be accepted. */
3084 for (; bs != NULL; bs = bs->next)
3085 {
3086 if ((bs->breakpoint_at != NULL)
3087 && is_internal_shlib_eventpoint (bs->breakpoint_at))
3088 return 1;
3089 }
3090
3091 /* If we get here, then no candidate was found. */
3092 return 0;
3093 }
3094
3095 /* This function returns TRUE if bs indicates that the inferior
3096 stopped due to a shared library (aka dynamically-linked library)
3097 event caught by a catchpoint.
3098
3099 If TRUE, cp_p is set to point to the catchpoint.
3100
3101 Else, the value of cp_p is undefined. */
3102 static int
3103 stopped_for_shlib_catchpoint (bs, cp_p)
3104 bpstat bs;
3105 struct breakpoint **cp_p;
3106 {
3107 /* Note that multiple eventpoints may've caused the stop. Any
3108 that are associated with shlib events will be accepted. */
3109 *cp_p = NULL;
3110
3111 for (; bs != NULL; bs = bs->next)
3112 {
3113 if ((bs->breakpoint_at != NULL)
3114 && ep_is_shlib_catchpoint (bs->breakpoint_at))
3115 {
3116 *cp_p = bs->breakpoint_at;
3117 return 1;
3118 }
3119 }
3120
3121 /* If we get here, then no candidate was found. */
3122 return 0;
3123 }
3124 \f
3125
3126 /* Reset proper settings after an asynchronous command has finished.
3127 If the execution command was in synchronous mode, register stdin
3128 with the event loop, and reset the prompt. */
3129 static void
3130 complete_execution ()
3131 {
3132 extern cleanup_sigint_signal_handler PARAMS ((void));
3133
3134 target_executing = 0;
3135 if (sync_execution)
3136 {
3137 add_file_handler (input_fd, (file_handler_func *) call_readline, 0);
3138 pop_prompt ();
3139 sync_execution = 0;
3140 cleanup_sigint_signal_handler ();
3141 display_gdb_prompt (0);
3142 }
3143 }
3144
3145 /* Here to return control to GDB when the inferior stops for real.
3146 Print appropriate messages, remove breakpoints, give terminal our modes.
3147
3148 STOP_PRINT_FRAME nonzero means print the executing frame
3149 (pc, function, args, file, line number and line text).
3150 BREAKPOINTS_FAILED nonzero means stop was due to error
3151 attempting to insert breakpoints. */
3152
3153 void
3154 normal_stop ()
3155 {
3156 /* As with the notification of thread events, we want to delay
3157 notifying the user that we've switched thread context until
3158 the inferior actually stops.
3159
3160 (Note that there's no point in saying anything if the inferior
3161 has exited!) */
3162 if (may_switch_from_inferior_pid
3163 && (switched_from_inferior_pid != inferior_pid)
3164 && target_has_execution)
3165 {
3166 target_terminal_ours_for_output ();
3167 printf_filtered ("[Switched to %s]\n",
3168 target_pid_or_tid_to_str (inferior_pid));
3169 switched_from_inferior_pid = inferior_pid;
3170 }
3171
3172 /* Make sure that the current_frame's pc is correct. This
3173 is a correction for setting up the frame info before doing
3174 DECR_PC_AFTER_BREAK */
3175 if (target_has_execution && get_current_frame ())
3176 (get_current_frame ())->pc = read_pc ();
3177
3178 if (breakpoints_failed)
3179 {
3180 target_terminal_ours_for_output ();
3181 print_sys_errmsg ("ptrace", breakpoints_failed);
3182 printf_filtered ("Stopped; cannot insert breakpoints.\n\
3183 The same program may be running in another process.\n");
3184 }
3185
3186 if (target_has_execution && breakpoints_inserted)
3187 {
3188 if (remove_breakpoints ())
3189 {
3190 target_terminal_ours_for_output ();
3191 printf_filtered ("Cannot remove breakpoints because ");
3192 printf_filtered ("program is no longer writable.\n");
3193 printf_filtered ("It might be running in another process.\n");
3194 printf_filtered ("Further execution is probably impossible.\n");
3195 }
3196 }
3197 breakpoints_inserted = 0;
3198
3199 /* Delete the breakpoint we stopped at, if it wants to be deleted.
3200 Delete any breakpoint that is to be deleted at the next stop. */
3201
3202 breakpoint_auto_delete (stop_bpstat);
3203
3204 /* If an auto-display called a function and that got a signal,
3205 delete that auto-display to avoid an infinite recursion. */
3206
3207 if (stopped_by_random_signal)
3208 disable_current_display ();
3209
3210 /* Don't print a message if in the middle of doing a "step n"
3211 operation for n > 1 */
3212 if (step_multi && stop_step)
3213 goto done;
3214
3215 target_terminal_ours ();
3216
3217 /* Did we stop because the user set the stop_on_solib_events
3218 variable? (If so, we report this as a generic, "Stopped due
3219 to shlib event" message.) */
3220 if (stopped_for_internal_shlib_event (stop_bpstat))
3221 {
3222 printf_filtered ("Stopped due to shared library event\n");
3223 }
3224
3225 /* Look up the hook_stop and run it if it exists. */
3226
3227 if (stop_command && stop_command->hook)
3228 {
3229 catch_errors (hook_stop_stub, stop_command->hook,
3230 "Error while running hook_stop:\n", RETURN_MASK_ALL);
3231 }
3232
3233 if (!target_has_stack)
3234 {
3235
3236 goto done;
3237 }
3238
3239 /* Select innermost stack frame - i.e., current frame is frame 0,
3240 and current location is based on that.
3241 Don't do this on return from a stack dummy routine,
3242 or if the program has exited. */
3243
3244 if (!stop_stack_dummy)
3245 {
3246 select_frame (get_current_frame (), 0);
3247
3248 /* Print current location without a level number, if
3249 we have changed functions or hit a breakpoint.
3250 Print source line if we have one.
3251 bpstat_print() contains the logic deciding in detail
3252 what to print, based on the event(s) that just occurred. */
3253
3254 if (stop_print_frame)
3255 {
3256 int bpstat_ret;
3257 int source_flag;
3258
3259 bpstat_ret = bpstat_print (stop_bpstat);
3260 /* bpstat_print() returned one of:
3261 -1: Didn't print anything
3262 0: Printed preliminary "Breakpoint n, " message, desires
3263 location tacked on
3264 1: Printed something, don't tack on location */
3265
3266 if (bpstat_ret == -1)
3267 if (stop_step
3268 && step_frame_address == FRAME_FP (get_current_frame ())
3269 && step_start_function == find_pc_function (stop_pc))
3270 source_flag = -1; /* finished step, just print source line */
3271 else
3272 source_flag = 1; /* print location and source line */
3273 else if (bpstat_ret == 0) /* hit bpt, desire location */
3274 source_flag = 1; /* print location and source line */
3275 else /* bpstat_ret == 1, hit bpt, do not desire location */
3276 source_flag = -1; /* just print source line */
3277
3278 /* The behavior of this routine with respect to the source
3279 flag is:
3280 -1: Print only source line
3281 0: Print only location
3282 1: Print location and source line */
3283 show_and_print_stack_frame (selected_frame, -1, source_flag);
3284
3285 /* Display the auto-display expressions. */
3286 do_displays ();
3287 }
3288 }
3289
3290 /* Save the function value return registers, if we care.
3291 We might be about to restore their previous contents. */
3292 if (proceed_to_finish)
3293 read_register_bytes (0, stop_registers, REGISTER_BYTES);
3294
3295 if (stop_stack_dummy)
3296 {
3297 /* Pop the empty frame that contains the stack dummy.
3298 POP_FRAME ends with a setting of the current frame, so we
3299 can use that next. */
3300 POP_FRAME;
3301 /* Set stop_pc to what it was before we called the function.
3302 Can't rely on restore_inferior_status because that only gets
3303 called if we don't stop in the called function. */
3304 stop_pc = read_pc ();
3305 select_frame (get_current_frame (), 0);
3306 }
3307
3308
3309 TUIDO (((TuiOpaqueFuncPtr) tui_vCheckDataValues, selected_frame));
3310
3311 done:
3312 annotate_stopped ();
3313 }
3314
3315 static int
3316 hook_stop_stub (cmd)
3317 PTR cmd;
3318 {
3319 execute_user_command ((struct cmd_list_element *) cmd, 0);
3320 return (0);
3321 }
3322 \f
3323 int
3324 signal_stop_state (signo)
3325 int signo;
3326 {
3327 return signal_stop[signo];
3328 }
3329
3330 int
3331 signal_print_state (signo)
3332 int signo;
3333 {
3334 return signal_print[signo];
3335 }
3336
3337 int
3338 signal_pass_state (signo)
3339 int signo;
3340 {
3341 return signal_program[signo];
3342 }
3343
3344 static void
3345 sig_print_header ()
3346 {
3347 printf_filtered ("\
3348 Signal Stop\tPrint\tPass to program\tDescription\n");
3349 }
3350
3351 static void
3352 sig_print_info (oursig)
3353 enum target_signal oursig;
3354 {
3355 char *name = target_signal_to_name (oursig);
3356 int name_padding = 13 - strlen (name);
3357 if (name_padding <= 0)
3358 name_padding = 0;
3359
3360 printf_filtered ("%s", name);
3361 printf_filtered ("%*.*s ", name_padding, name_padding,
3362 " ");
3363 printf_filtered ("%s\t", signal_stop[oursig] ? "Yes" : "No");
3364 printf_filtered ("%s\t", signal_print[oursig] ? "Yes" : "No");
3365 printf_filtered ("%s\t\t", signal_program[oursig] ? "Yes" : "No");
3366 printf_filtered ("%s\n", target_signal_to_string (oursig));
3367 }
3368
3369 /* Specify how various signals in the inferior should be handled. */
3370
3371 static void
3372 handle_command (args, from_tty)
3373 char *args;
3374 int from_tty;
3375 {
3376 char **argv;
3377 int digits, wordlen;
3378 int sigfirst, signum, siglast;
3379 enum target_signal oursig;
3380 int allsigs;
3381 int nsigs;
3382 unsigned char *sigs;
3383 struct cleanup *old_chain;
3384
3385 if (args == NULL)
3386 {
3387 error_no_arg ("signal to handle");
3388 }
3389
3390 /* Allocate and zero an array of flags for which signals to handle. */
3391
3392 nsigs = (int) TARGET_SIGNAL_LAST;
3393 sigs = (unsigned char *) alloca (nsigs);
3394 memset (sigs, 0, nsigs);
3395
3396 /* Break the command line up into args. */
3397
3398 argv = buildargv (args);
3399 if (argv == NULL)
3400 {
3401 nomem (0);
3402 }
3403 old_chain = make_cleanup_freeargv (argv);
3404
3405 /* Walk through the args, looking for signal oursigs, signal names, and
3406 actions. Signal numbers and signal names may be interspersed with
3407 actions, with the actions being performed for all signals cumulatively
3408 specified. Signal ranges can be specified as <LOW>-<HIGH>. */
3409
3410 while (*argv != NULL)
3411 {
3412 wordlen = strlen (*argv);
3413 for (digits = 0; isdigit ((*argv)[digits]); digits++)
3414 {;
3415 }
3416 allsigs = 0;
3417 sigfirst = siglast = -1;
3418
3419 if (wordlen >= 1 && !strncmp (*argv, "all", wordlen))
3420 {
3421 /* Apply action to all signals except those used by the
3422 debugger. Silently skip those. */
3423 allsigs = 1;
3424 sigfirst = 0;
3425 siglast = nsigs - 1;
3426 }
3427 else if (wordlen >= 1 && !strncmp (*argv, "stop", wordlen))
3428 {
3429 SET_SIGS (nsigs, sigs, signal_stop);
3430 SET_SIGS (nsigs, sigs, signal_print);
3431 }
3432 else if (wordlen >= 1 && !strncmp (*argv, "ignore", wordlen))
3433 {
3434 UNSET_SIGS (nsigs, sigs, signal_program);
3435 }
3436 else if (wordlen >= 2 && !strncmp (*argv, "print", wordlen))
3437 {
3438 SET_SIGS (nsigs, sigs, signal_print);
3439 }
3440 else if (wordlen >= 2 && !strncmp (*argv, "pass", wordlen))
3441 {
3442 SET_SIGS (nsigs, sigs, signal_program);
3443 }
3444 else if (wordlen >= 3 && !strncmp (*argv, "nostop", wordlen))
3445 {
3446 UNSET_SIGS (nsigs, sigs, signal_stop);
3447 }
3448 else if (wordlen >= 3 && !strncmp (*argv, "noignore", wordlen))
3449 {
3450 SET_SIGS (nsigs, sigs, signal_program);
3451 }
3452 else if (wordlen >= 4 && !strncmp (*argv, "noprint", wordlen))
3453 {
3454 UNSET_SIGS (nsigs, sigs, signal_print);
3455 UNSET_SIGS (nsigs, sigs, signal_stop);
3456 }
3457 else if (wordlen >= 4 && !strncmp (*argv, "nopass", wordlen))
3458 {
3459 UNSET_SIGS (nsigs, sigs, signal_program);
3460 }
3461 else if (digits > 0)
3462 {
3463 /* It is numeric. The numeric signal refers to our own
3464 internal signal numbering from target.h, not to host/target
3465 signal number. This is a feature; users really should be
3466 using symbolic names anyway, and the common ones like
3467 SIGHUP, SIGINT, SIGALRM, etc. will work right anyway. */
3468
3469 sigfirst = siglast = (int)
3470 target_signal_from_command (atoi (*argv));
3471 if ((*argv)[digits] == '-')
3472 {
3473 siglast = (int)
3474 target_signal_from_command (atoi ((*argv) + digits + 1));
3475 }
3476 if (sigfirst > siglast)
3477 {
3478 /* Bet he didn't figure we'd think of this case... */
3479 signum = sigfirst;
3480 sigfirst = siglast;
3481 siglast = signum;
3482 }
3483 }
3484 else
3485 {
3486 oursig = target_signal_from_name (*argv);
3487 if (oursig != TARGET_SIGNAL_UNKNOWN)
3488 {
3489 sigfirst = siglast = (int) oursig;
3490 }
3491 else
3492 {
3493 /* Not a number and not a recognized flag word => complain. */
3494 error ("Unrecognized or ambiguous flag word: \"%s\".", *argv);
3495 }
3496 }
3497
3498 /* If any signal numbers or symbol names were found, set flags for
3499 which signals to apply actions to. */
3500
3501 for (signum = sigfirst; signum >= 0 && signum <= siglast; signum++)
3502 {
3503 switch ((enum target_signal) signum)
3504 {
3505 case TARGET_SIGNAL_TRAP:
3506 case TARGET_SIGNAL_INT:
3507 if (!allsigs && !sigs[signum])
3508 {
3509 if (query ("%s is used by the debugger.\n\
3510 Are you sure you want to change it? ",
3511 target_signal_to_name
3512 ((enum target_signal) signum)))
3513 {
3514 sigs[signum] = 1;
3515 }
3516 else
3517 {
3518 printf_unfiltered ("Not confirmed, unchanged.\n");
3519 gdb_flush (gdb_stdout);
3520 }
3521 }
3522 break;
3523 case TARGET_SIGNAL_0:
3524 case TARGET_SIGNAL_DEFAULT:
3525 case TARGET_SIGNAL_UNKNOWN:
3526 /* Make sure that "all" doesn't print these. */
3527 break;
3528 default:
3529 sigs[signum] = 1;
3530 break;
3531 }
3532 }
3533
3534 argv++;
3535 }
3536
3537 target_notice_signals (inferior_pid);
3538
3539 if (from_tty)
3540 {
3541 /* Show the results. */
3542 sig_print_header ();
3543 for (signum = 0; signum < nsigs; signum++)
3544 {
3545 if (sigs[signum])
3546 {
3547 sig_print_info (signum);
3548 }
3549 }
3550 }
3551
3552 do_cleanups (old_chain);
3553 }
3554
3555 static void
3556 xdb_handle_command (args, from_tty)
3557 char *args;
3558 int from_tty;
3559 {
3560 char **argv;
3561 struct cleanup *old_chain;
3562
3563 /* Break the command line up into args. */
3564
3565 argv = buildargv (args);
3566 if (argv == NULL)
3567 {
3568 nomem (0);
3569 }
3570 old_chain = make_cleanup_freeargv (argv);
3571 if (argv[1] != (char *) NULL)
3572 {
3573 char *argBuf;
3574 int bufLen;
3575
3576 bufLen = strlen (argv[0]) + 20;
3577 argBuf = (char *) xmalloc (bufLen);
3578 if (argBuf)
3579 {
3580 int validFlag = 1;
3581 enum target_signal oursig;
3582
3583 oursig = target_signal_from_name (argv[0]);
3584 memset (argBuf, 0, bufLen);
3585 if (strcmp (argv[1], "Q") == 0)
3586 sprintf (argBuf, "%s %s", argv[0], "noprint");
3587 else
3588 {
3589 if (strcmp (argv[1], "s") == 0)
3590 {
3591 if (!signal_stop[oursig])
3592 sprintf (argBuf, "%s %s", argv[0], "stop");
3593 else
3594 sprintf (argBuf, "%s %s", argv[0], "nostop");
3595 }
3596 else if (strcmp (argv[1], "i") == 0)
3597 {
3598 if (!signal_program[oursig])
3599 sprintf (argBuf, "%s %s", argv[0], "pass");
3600 else
3601 sprintf (argBuf, "%s %s", argv[0], "nopass");
3602 }
3603 else if (strcmp (argv[1], "r") == 0)
3604 {
3605 if (!signal_print[oursig])
3606 sprintf (argBuf, "%s %s", argv[0], "print");
3607 else
3608 sprintf (argBuf, "%s %s", argv[0], "noprint");
3609 }
3610 else
3611 validFlag = 0;
3612 }
3613 if (validFlag)
3614 handle_command (argBuf, from_tty);
3615 else
3616 printf_filtered ("Invalid signal handling flag.\n");
3617 if (argBuf)
3618 free (argBuf);
3619 }
3620 }
3621 do_cleanups (old_chain);
3622 }
3623
3624 /* Print current contents of the tables set by the handle command.
3625 It is possible we should just be printing signals actually used
3626 by the current target (but for things to work right when switching
3627 targets, all signals should be in the signal tables). */
3628
3629 static void
3630 signals_info (signum_exp, from_tty)
3631 char *signum_exp;
3632 int from_tty;
3633 {
3634 enum target_signal oursig;
3635 sig_print_header ();
3636
3637 if (signum_exp)
3638 {
3639 /* First see if this is a symbol name. */
3640 oursig = target_signal_from_name (signum_exp);
3641 if (oursig == TARGET_SIGNAL_UNKNOWN)
3642 {
3643 /* No, try numeric. */
3644 oursig =
3645 target_signal_from_command (parse_and_eval_address (signum_exp));
3646 }
3647 sig_print_info (oursig);
3648 return;
3649 }
3650
3651 printf_filtered ("\n");
3652 /* These ugly casts brought to you by the native VAX compiler. */
3653 for (oursig = TARGET_SIGNAL_FIRST;
3654 (int) oursig < (int) TARGET_SIGNAL_LAST;
3655 oursig = (enum target_signal) ((int) oursig + 1))
3656 {
3657 QUIT;
3658
3659 if (oursig != TARGET_SIGNAL_UNKNOWN
3660 && oursig != TARGET_SIGNAL_DEFAULT
3661 && oursig != TARGET_SIGNAL_0)
3662 sig_print_info (oursig);
3663 }
3664
3665 printf_filtered ("\nUse the \"handle\" command to change these tables.\n");
3666 }
3667 \f
3668 struct inferior_status
3669 {
3670 enum target_signal stop_signal;
3671 CORE_ADDR stop_pc;
3672 bpstat stop_bpstat;
3673 int stop_step;
3674 int stop_stack_dummy;
3675 int stopped_by_random_signal;
3676 int trap_expected;
3677 CORE_ADDR step_range_start;
3678 CORE_ADDR step_range_end;
3679 CORE_ADDR step_frame_address;
3680 int step_over_calls;
3681 CORE_ADDR step_resume_break_address;
3682 int stop_after_trap;
3683 int stop_soon_quietly;
3684 CORE_ADDR selected_frame_address;
3685 char *stop_registers;
3686
3687 /* These are here because if call_function_by_hand has written some
3688 registers and then decides to call error(), we better not have changed
3689 any registers. */
3690 char *registers;
3691
3692 int selected_level;
3693 int breakpoint_proceeded;
3694 int restore_stack_info;
3695 int proceed_to_finish;
3696 };
3697
3698
3699 static struct inferior_status *xmalloc_inferior_status PARAMS ((void));
3700 static struct inferior_status *
3701 xmalloc_inferior_status ()
3702 {
3703 struct inferior_status *inf_status;
3704 inf_status = xmalloc (sizeof (struct inferior_status));
3705 inf_status->stop_registers = xmalloc (REGISTER_BYTES);
3706 inf_status->registers = xmalloc (REGISTER_BYTES);
3707 return inf_status;
3708 }
3709
3710 static void free_inferior_status PARAMS ((struct inferior_status *));
3711 static void
3712 free_inferior_status (inf_status)
3713 struct inferior_status *inf_status;
3714 {
3715 free (inf_status->registers);
3716 free (inf_status->stop_registers);
3717 free (inf_status);
3718 }
3719
3720 void
3721 write_inferior_status_register (inf_status, regno, val)
3722 struct inferior_status *inf_status;
3723 int regno;
3724 LONGEST val;
3725 {
3726 int size = REGISTER_RAW_SIZE (regno);
3727 void *buf = alloca (size);
3728 store_signed_integer (buf, size, val);
3729 memcpy (&inf_status->registers[REGISTER_BYTE (regno)], buf, size);
3730 }
3731
3732
3733
3734 /* Save all of the information associated with the inferior<==>gdb
3735 connection. INF_STATUS is a pointer to a "struct inferior_status"
3736 (defined in inferior.h). */
3737
3738 struct inferior_status *
3739 save_inferior_status (restore_stack_info)
3740 int restore_stack_info;
3741 {
3742 struct inferior_status *inf_status = xmalloc_inferior_status ();
3743
3744 inf_status->stop_signal = stop_signal;
3745 inf_status->stop_pc = stop_pc;
3746 inf_status->stop_step = stop_step;
3747 inf_status->stop_stack_dummy = stop_stack_dummy;
3748 inf_status->stopped_by_random_signal = stopped_by_random_signal;
3749 inf_status->trap_expected = trap_expected;
3750 inf_status->step_range_start = step_range_start;
3751 inf_status->step_range_end = step_range_end;
3752 inf_status->step_frame_address = step_frame_address;
3753 inf_status->step_over_calls = step_over_calls;
3754 inf_status->stop_after_trap = stop_after_trap;
3755 inf_status->stop_soon_quietly = stop_soon_quietly;
3756 /* Save original bpstat chain here; replace it with copy of chain.
3757 If caller's caller is walking the chain, they'll be happier if we
3758 hand them back the original chain when restore_inferior_status is
3759 called. */
3760 inf_status->stop_bpstat = stop_bpstat;
3761 stop_bpstat = bpstat_copy (stop_bpstat);
3762 inf_status->breakpoint_proceeded = breakpoint_proceeded;
3763 inf_status->restore_stack_info = restore_stack_info;
3764 inf_status->proceed_to_finish = proceed_to_finish;
3765
3766 memcpy (inf_status->stop_registers, stop_registers, REGISTER_BYTES);
3767
3768 read_register_bytes (0, inf_status->registers, REGISTER_BYTES);
3769
3770 record_selected_frame (&(inf_status->selected_frame_address),
3771 &(inf_status->selected_level));
3772 return inf_status;
3773 }
3774
3775 struct restore_selected_frame_args
3776 {
3777 CORE_ADDR frame_address;
3778 int level;
3779 };
3780
3781 static int restore_selected_frame PARAMS ((PTR));
3782
3783 static int
3784 restore_selected_frame (args)
3785 PTR args;
3786 {
3787 struct restore_selected_frame_args *fr =
3788 (struct restore_selected_frame_args *) args;
3789 struct frame_info *frame;
3790 int level = fr->level;
3791
3792 frame = find_relative_frame (get_current_frame (), &level);
3793
3794 /* If inf_status->selected_frame_address is NULL, there was no
3795 previously selected frame. */
3796 if (frame == NULL ||
3797 /* FRAME_FP (frame) != fr->frame_address || */
3798 /* elz: deleted this check as a quick fix to the problem that
3799 for function called by hand gdb creates no internal frame
3800 structure and the real stack and gdb's idea of stack are
3801 different if nested calls by hands are made.
3802
3803 mvs: this worries me. */
3804 level != 0)
3805 {
3806 warning ("Unable to restore previously selected frame.\n");
3807 return 0;
3808 }
3809
3810 select_frame (frame, fr->level);
3811
3812 return (1);
3813 }
3814
3815 void
3816 restore_inferior_status (inf_status)
3817 struct inferior_status *inf_status;
3818 {
3819 stop_signal = inf_status->stop_signal;
3820 stop_pc = inf_status->stop_pc;
3821 stop_step = inf_status->stop_step;
3822 stop_stack_dummy = inf_status->stop_stack_dummy;
3823 stopped_by_random_signal = inf_status->stopped_by_random_signal;
3824 trap_expected = inf_status->trap_expected;
3825 step_range_start = inf_status->step_range_start;
3826 step_range_end = inf_status->step_range_end;
3827 step_frame_address = inf_status->step_frame_address;
3828 step_over_calls = inf_status->step_over_calls;
3829 stop_after_trap = inf_status->stop_after_trap;
3830 stop_soon_quietly = inf_status->stop_soon_quietly;
3831 bpstat_clear (&stop_bpstat);
3832 stop_bpstat = inf_status->stop_bpstat;
3833 breakpoint_proceeded = inf_status->breakpoint_proceeded;
3834 proceed_to_finish = inf_status->proceed_to_finish;
3835
3836 /* FIXME: Is the restore of stop_registers always needed */
3837 memcpy (stop_registers, inf_status->stop_registers, REGISTER_BYTES);
3838
3839 /* The inferior can be gone if the user types "print exit(0)"
3840 (and perhaps other times). */
3841 if (target_has_execution)
3842 write_register_bytes (0, inf_status->registers, REGISTER_BYTES);
3843
3844 /* FIXME: If we are being called after stopping in a function which
3845 is called from gdb, we should not be trying to restore the
3846 selected frame; it just prints a spurious error message (The
3847 message is useful, however, in detecting bugs in gdb (like if gdb
3848 clobbers the stack)). In fact, should we be restoring the
3849 inferior status at all in that case? . */
3850
3851 if (target_has_stack && inf_status->restore_stack_info)
3852 {
3853 struct restore_selected_frame_args fr;
3854 fr.level = inf_status->selected_level;
3855 fr.frame_address = inf_status->selected_frame_address;
3856 /* The point of catch_errors is that if the stack is clobbered,
3857 walking the stack might encounter a garbage pointer and error()
3858 trying to dereference it. */
3859 if (catch_errors (restore_selected_frame, &fr,
3860 "Unable to restore previously selected frame:\n",
3861 RETURN_MASK_ERROR) == 0)
3862 /* Error in restoring the selected frame. Select the innermost
3863 frame. */
3864
3865
3866 select_frame (get_current_frame (), 0);
3867
3868 }
3869
3870 free_inferior_status (inf_status);
3871 }
3872
3873 void
3874 discard_inferior_status (inf_status)
3875 struct inferior_status *inf_status;
3876 {
3877 /* See save_inferior_status for info on stop_bpstat. */
3878 bpstat_clear (&inf_status->stop_bpstat);
3879 free_inferior_status (inf_status);
3880 }
3881
3882 static void
3883 set_follow_fork_mode_command (arg, from_tty, c)
3884 char *arg;
3885 int from_tty;
3886 struct cmd_list_element *c;
3887 {
3888 if (!STREQ (arg, "parent") &&
3889 !STREQ (arg, "child") &&
3890 !STREQ (arg, "both") &&
3891 !STREQ (arg, "ask"))
3892 error ("follow-fork-mode must be one of \"parent\", \"child\", \"both\" or \"ask\".");
3893
3894 if (follow_fork_mode_string != NULL)
3895 free (follow_fork_mode_string);
3896 follow_fork_mode_string = savestring (arg, strlen (arg));
3897 }
3898 \f
3899
3900
3901 static void build_infrun PARAMS ((void));
3902 static void
3903 build_infrun ()
3904 {
3905 stop_registers = xmalloc (REGISTER_BYTES);
3906 }
3907
3908
3909 void
3910 _initialize_infrun ()
3911 {
3912 register int i;
3913 register int numsigs;
3914 struct cmd_list_element *c;
3915
3916 build_infrun ();
3917
3918 register_gdbarch_swap (&stop_registers, sizeof (stop_registers), NULL);
3919 register_gdbarch_swap (NULL, 0, build_infrun);
3920
3921 add_info ("signals", signals_info,
3922 "What debugger does when program gets various signals.\n\
3923 Specify a signal as argument to print info on that signal only.");
3924 add_info_alias ("handle", "signals", 0);
3925
3926 add_com ("handle", class_run, handle_command,
3927 concat ("Specify how to handle a signal.\n\
3928 Args are signals and actions to apply to those signals.\n\
3929 Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\
3930 from 1-15 are allowed for compatibility with old versions of GDB.\n\
3931 Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\
3932 The special arg \"all\" is recognized to mean all signals except those\n\
3933 used by the debugger, typically SIGTRAP and SIGINT.\n",
3934 "Recognized actions include \"stop\", \"nostop\", \"print\", \"noprint\",\n\
3935 \"pass\", \"nopass\", \"ignore\", or \"noignore\".\n\
3936 Stop means reenter debugger if this signal happens (implies print).\n\
3937 Print means print a message if this signal happens.\n\
3938 Pass means let program see this signal; otherwise program doesn't know.\n\
3939 Ignore is a synonym for nopass and noignore is a synonym for pass.\n\
3940 Pass and Stop may be combined.", NULL));
3941 if (xdb_commands)
3942 {
3943 add_com ("lz", class_info, signals_info,
3944 "What debugger does when program gets various signals.\n\
3945 Specify a signal as argument to print info on that signal only.");
3946 add_com ("z", class_run, xdb_handle_command,
3947 concat ("Specify how to handle a signal.\n\
3948 Args are signals and actions to apply to those signals.\n\
3949 Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\
3950 from 1-15 are allowed for compatibility with old versions of GDB.\n\
3951 Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\
3952 The special arg \"all\" is recognized to mean all signals except those\n\
3953 used by the debugger, typically SIGTRAP and SIGINT.\n",
3954 "Recognized actions include \"s\" (toggles between stop and nostop), \n\
3955 \"r\" (toggles between print and noprint), \"i\" (toggles between pass and \
3956 nopass), \"Q\" (noprint)\n\
3957 Stop means reenter debugger if this signal happens (implies print).\n\
3958 Print means print a message if this signal happens.\n\
3959 Pass means let program see this signal; otherwise program doesn't know.\n\
3960 Ignore is a synonym for nopass and noignore is a synonym for pass.\n\
3961 Pass and Stop may be combined.", NULL));
3962 }
3963
3964 if (!dbx_commands)
3965 stop_command = add_cmd ("stop", class_obscure, not_just_help_class_command,
3966 "There is no `stop' command, but you can set a hook on `stop'.\n\
3967 This allows you to set a list of commands to be run each time execution\n\
3968 of the program stops.", &cmdlist);
3969
3970 numsigs = (int) TARGET_SIGNAL_LAST;
3971 signal_stop = (unsigned char *)
3972 xmalloc (sizeof (signal_stop[0]) * numsigs);
3973 signal_print = (unsigned char *)
3974 xmalloc (sizeof (signal_print[0]) * numsigs);
3975 signal_program = (unsigned char *)
3976 xmalloc (sizeof (signal_program[0]) * numsigs);
3977 for (i = 0; i < numsigs; i++)
3978 {
3979 signal_stop[i] = 1;
3980 signal_print[i] = 1;
3981 signal_program[i] = 1;
3982 }
3983
3984 /* Signals caused by debugger's own actions
3985 should not be given to the program afterwards. */
3986 signal_program[TARGET_SIGNAL_TRAP] = 0;
3987 signal_program[TARGET_SIGNAL_INT] = 0;
3988
3989 /* Signals that are not errors should not normally enter the debugger. */
3990 signal_stop[TARGET_SIGNAL_ALRM] = 0;
3991 signal_print[TARGET_SIGNAL_ALRM] = 0;
3992 signal_stop[TARGET_SIGNAL_VTALRM] = 0;
3993 signal_print[TARGET_SIGNAL_VTALRM] = 0;
3994 signal_stop[TARGET_SIGNAL_PROF] = 0;
3995 signal_print[TARGET_SIGNAL_PROF] = 0;
3996 signal_stop[TARGET_SIGNAL_CHLD] = 0;
3997 signal_print[TARGET_SIGNAL_CHLD] = 0;
3998 signal_stop[TARGET_SIGNAL_IO] = 0;
3999 signal_print[TARGET_SIGNAL_IO] = 0;
4000 signal_stop[TARGET_SIGNAL_POLL] = 0;
4001 signal_print[TARGET_SIGNAL_POLL] = 0;
4002 signal_stop[TARGET_SIGNAL_URG] = 0;
4003 signal_print[TARGET_SIGNAL_URG] = 0;
4004 signal_stop[TARGET_SIGNAL_WINCH] = 0;
4005 signal_print[TARGET_SIGNAL_WINCH] = 0;
4006
4007 /* These signals are used internally by user-level thread
4008 implementations. (See signal(5) on Solaris.) Like the above
4009 signals, a healthy program receives and handles them as part of
4010 its normal operation. */
4011 signal_stop[TARGET_SIGNAL_LWP] = 0;
4012 signal_print[TARGET_SIGNAL_LWP] = 0;
4013 signal_stop[TARGET_SIGNAL_WAITING] = 0;
4014 signal_print[TARGET_SIGNAL_WAITING] = 0;
4015 signal_stop[TARGET_SIGNAL_CANCEL] = 0;
4016 signal_print[TARGET_SIGNAL_CANCEL] = 0;
4017
4018 #ifdef SOLIB_ADD
4019 add_show_from_set
4020 (add_set_cmd ("stop-on-solib-events", class_support, var_zinteger,
4021 (char *) &stop_on_solib_events,
4022 "Set stopping for shared library events.\n\
4023 If nonzero, gdb will give control to the user when the dynamic linker\n\
4024 notifies gdb of shared library events. The most common event of interest\n\
4025 to the user would be loading/unloading of a new library.\n",
4026 &setlist),
4027 &showlist);
4028 #endif
4029
4030 c = add_set_enum_cmd ("follow-fork-mode",
4031 class_run,
4032 follow_fork_mode_kind_names,
4033 (char *) &follow_fork_mode_string,
4034 /* ??rehrauer: The "both" option is broken, by what may be a 10.20
4035 kernel problem. It's also not terribly useful without a GUI to
4036 help the user drive two debuggers. So for now, I'm disabling
4037 the "both" option. */
4038 /* "Set debugger response to a program call of fork \
4039 or vfork.\n\
4040 A fork or vfork creates a new process. follow-fork-mode can be:\n\
4041 parent - the original process is debugged after a fork\n\
4042 child - the new process is debugged after a fork\n\
4043 both - both the parent and child are debugged after a fork\n\
4044 ask - the debugger will ask for one of the above choices\n\
4045 For \"both\", another copy of the debugger will be started to follow\n\
4046 the new child process. The original debugger will continue to follow\n\
4047 the original parent process. To distinguish their prompts, the\n\
4048 debugger copy's prompt will be changed.\n\
4049 For \"parent\" or \"child\", the unfollowed process will run free.\n\
4050 By default, the debugger will follow the parent process.",
4051 */
4052 "Set debugger response to a program call of fork \
4053 or vfork.\n\
4054 A fork or vfork creates a new process. follow-fork-mode can be:\n\
4055 parent - the original process is debugged after a fork\n\
4056 child - the new process is debugged after a fork\n\
4057 ask - the debugger will ask for one of the above choices\n\
4058 For \"parent\" or \"child\", the unfollowed process will run free.\n\
4059 By default, the debugger will follow the parent process.",
4060 &setlist);
4061 /* c->function.sfunc = ; */
4062 add_show_from_set (c, &showlist);
4063
4064 set_follow_fork_mode_command ("parent", 0, NULL);
4065
4066 c = add_set_enum_cmd ("scheduler-locking", class_run,
4067 scheduler_enums, /* array of string names */
4068 (char *) &scheduler_mode, /* current mode */
4069 "Set mode for locking scheduler during execution.\n\
4070 off == no locking (threads may preempt at any time)\n\
4071 on == full locking (no thread except the current thread may run)\n\
4072 step == scheduler locked during every single-step operation.\n\
4073 In this mode, no other thread may run during a step command.\n\
4074 Other threads may run while stepping over a function call ('next').",
4075 &setlist);
4076
4077 c->function.sfunc = set_schedlock_func; /* traps on target vector */
4078 add_show_from_set (c, &showlist);
4079 }
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